阅读说明：本技术 薄膜生产线烘箱及热平衡烘箱单元 (Film production line oven and heat balance oven unit ) 是由 汤智勇 何汉昭 梁达辉 陈健鸿 于 2020-08-20 设计创作，主要内容包括：本发明涉及一种薄膜生产线烘箱及热平衡烘箱单元,热平衡烘箱单元包括：风管组、第一送风组与第二送风组。风管组包括水平错位设置的第一送风管与第二送风管。第一送风管与第二送风管面向薄膜的管壁上均设有若干个通风口。第一送风组位于第一送风管一端的侧部及第二送风管的延伸方向上,第一送风组与第一送风管一端的侧部相连通；第二送风组位于第二送风管一端的侧部及第一送风管的延伸方向上,第二送风组与第二送风管一端的侧部相连通。薄膜生产线烘箱及热平衡烘箱单元,第一送风管内的热风流动方向与第二送风管内的热风流动方向相反,起到热风热量错位补偿的效果,能实现薄膜对应于风管组的部位受热均匀,从而能保证薄膜产品的加工质量。(The invention relates to a film production line oven and a heat balance oven unit, wherein the heat balance oven unit comprises: the air supply system comprises an air pipe group, a first air supply group and a second air supply group. The air pipe group comprises a first air supply pipe and a second air supply pipe which are horizontally arranged in a staggered manner. The walls of the first air supply pipe and the second air supply pipe facing the film are provided with a plurality of ventilation openings. The first air supply group is positioned on the side part of one end of the first air supply pipe and the extension direction of the second air supply pipe, and the first air supply group is communicated with the side part of one end of the first air supply pipe; the second air supply group is positioned on the side part of one end of the second air supply pipe and the extending direction of the first air supply pipe, and the second air supply group is communicated with the side part of one end of the second air supply pipe. The film production line oven and the heat balance oven unit have the advantages that the hot air flowing direction in the first air supply pipe is opposite to that in the second air supply pipe, the effect of hot air heat dislocation compensation is achieved, the position, corresponding to the air pipe group, of the film can be heated uniformly, and therefore the processing quality of a film product can be guaranteed.)

1. A heat-equalizing oven unit, comprising:

the air pipe group comprises a first air supply pipe and a second air supply pipe which are horizontally arranged in a staggered manner, and a plurality of ventilation openings are formed in the pipe walls of the first air supply pipe and the second air supply pipe facing the film;

the first air supply group is positioned on the side part of one end of the first air supply pipe and in the extending direction of the second air supply pipe, the first air supply group is communicated with the side part of one end of the first air supply pipe, and the other end of the first air supply pipe is a closed end; the second air supply group is positioned on the side part of one end of the second air supply pipe and in the extending direction of the first air supply pipe, the second air supply group is communicated with the side part of one end of the second air supply pipe, and the other end of the second air supply pipe is a closed end; the direction of the air flow in the first air supply pipe is opposite to that of the air flow in the second air supply pipe.

2. The heat balance oven unit of claim 1, wherein the two groups of air ducts are spaced apart, the spacing between the two groups of air ducts being adapted to pass through the film being processed.

3. The heat-balancing oven unit of claim 2, wherein there are two first air supply groups and two second air supply groups, the two first air supply groups are disposed in one-to-one correspondence with the two air duct groups, and the two second air supply groups are disposed in one-to-one correspondence with the two air duct groups;

or, the first air supply group and the second air supply group are both one, the air outlets of the first air supply group are respectively communicated with the first air supply pipes of the two air pipe groups in a one-to-one correspondence manner, and the air outlets of the second air supply group are respectively communicated with the second air supply pipes of the two air pipe groups in a one-to-one correspondence manner.

4. The heat-equalizing oven unit of claim 2, wherein the first air supply duct is at least two and the second air supply duct is at least two; the first air supply pipes and the second air supply pipes are sequentially and alternately arranged, air outlets of the first air supply group are respectively communicated with air inlet ends of at least two first air supply pipes, and air outlets of the second air supply group are respectively communicated with air inlet ends of at least two second air supply pipes.

5. The thermal balance oven unit of claim 2, wherein the air duct group further comprises at least one straight tube arranged between the first air duct and the second air duct, a vent is arranged on a wall of the straight tube facing the film, one end of the at least one straight tube and an air inlet end of the first air duct are both communicated with an air outlet of the first air duct group, and the other end of the at least one straight tube and an air inlet end of the second air duct are both communicated with an air outlet of the second air duct group.

6. The heat-balancing oven unit of claim 2, wherein the first air supply set comprises a first air return hood, a first plenum box, a first fan disposed on the first plenum box, and a first heater disposed on the first air return hood or the first plenum box, the first plenum box is provided with a first air return opening and a first air outlet, the first air return opening is communicated with the first air return hood, and the first air outlet is communicated with an air inlet end of the first air supply pipe; the second air supply group comprises a second air return cover, a second static pressure box, a second fan arranged on the second static pressure box and a second heater arranged on the second air return cover or the second static pressure box, the second static pressure box is provided with a second air return opening and a second air outlet, the second air return opening is communicated with the second air return cover, and the second air outlet is communicated with the air inlet end of the second air supply pipe.

7. The heat balance oven unit of claim 6, further comprising two oppositely disposed side panels, a top panel and a bottom panel, and two oppositely disposed insulation panels, wherein the side panels and the insulation panels are connected to the top panel, the side panels and the insulation panels are also connected to the bottom panel, and the side panels, the insulation panels, the top panel and the bottom panel enclose a box.

8. The thermal balance oven unit of claim 7, wherein two of said air duct stacks are disposed in spaced relation up and down between said top panel and said bottom panel, and wherein there are two of said first air return housing and two of said second air return housings, one of said first air return housing and one of said second air return housings being disposed in a spaced relation between one of said air duct stacks and said top panel, and the other of said first air return housing and the other of said second air return housings being disposed in a spaced relation between the other of said air duct stacks and said bottom panel.

9. The heat balance oven unit of claim 7, wherein a first openable door is provided on one of the side panels adjacent to the air inlet end of the first air supply duct at a position corresponding to the air inlet end of the first air supply duct, the air inlet end of the first air supply duct is detachably connected to the first plenum box, and the first air supply duct is movably disposed in the box body and is movable to the outside of the box body; and a second door which can be opened is arranged on the other side panel close to the air inlet end of the second air supply pipe and at the position corresponding to the air inlet end of the second air supply pipe, the air inlet end of the second air supply pipe is detachably connected with the second static pressure box, and the second air supply pipe is movably arranged in the box body and can move out of the box body.

10. A film production line oven, characterized in that it comprises more than two heat balance oven units according to any one of claims 1 to 9, arranged in sequence.

Technical Field

The invention relates to the technical field of film production lines, in particular to a film production line oven and a heat balance oven unit.

Background

The film production line oven is used for providing proper process conditions for the polymer film so as to finish the processing processes of stretching, heat setting, cooling and the like in a high-temperature environment. For the production of film materials applied to special high-end fields such as lithium batteries, electronics, medical treatment, aerospace and the like, extremely strict requirements are imposed on the uniformity of hot air temperature, air speed, air pressure and the like of different units of a film production line oven.

In the conventional technology, a film production line oven comprises a plurality of oven units which are arranged in sequence. One side of the oven unit is provided with a static pressure box or both sides of the oven unit are provided with static pressure boxes. The oven unit is also provided with an air suction opening communicated with the air inlet of the static pressure box and an air supply pipe communicated with the air outlet of the static pressure box. The suction inlet sends the sucked air into the static pressure box, and the air outlet of the static pressure box blows the air to the film through the air supply pipe, so that the process environment for carrying out heat treatment on the film is realized. However, the temperature and the wind speed of the hot wind on the side of the film close to the wind outlet of the static pressure box are relatively high, and the temperature difference is formed between the upper space and the lower space of the film due to the rising characteristic of the hot wind, so that the uniformity of the hot wind environment of the film is insufficient, and the requirement of film processing in high-end fields cannot be met.

Disclosure of Invention

Based on this, it is necessary to overcome the defects in the prior art, and provide a film production line oven and a heat balance oven unit, which can improve the uniformity of the film heat treatment environment and improve the processing quality of the film product.

The technical scheme is as follows: a thermal balancing oven unit, comprising: the air pipe group comprises a first air supply pipe and a second air supply pipe which are horizontally arranged in a staggered manner, and a plurality of ventilation openings are formed in the pipe walls of the first air supply pipe and the second air supply pipe facing the film; the first air supply group is positioned on the side part of one end of the first air supply pipe and in the extending direction of the second air supply pipe, the first air supply group is communicated with the side part of one end of the first air supply pipe, and the other end of the first air supply pipe is a closed end; the second air supply group is positioned on the side part of one end of the second air supply pipe and in the extending direction of the first air supply pipe, the second air supply group is communicated with the side part of one end of the second air supply pipe, and the other end of the second air supply pipe is a closed end; the direction of the air flow in the first air supply pipe is opposite to that of the air flow in the second air supply pipe.

In the heat balance oven unit, the first air supply group sends hot air into the first air supply pipe through one end of the first air supply pipe, the hot air is discharged outwards from the vent of the first air supply pipe and blows towards the film, the second air supply group sends hot air into the second air supply pipe through one end of the second air supply pipe, and the hot air is discharged outwards from the vent of the second air supply pipe and blows towards the film. Because the temperature of the hot air in the first air supply pipe gradually becomes lower along with the flowing direction, the temperature of the hot air in the second air supply pipe gradually becomes lower along with the flowing direction, namely the temperature of the hot air at the air inlet end (namely, the end part connected with the first air supply group) of the first air supply pipe is higher than the closed end of the first air supply pipe, and the temperature of the hot air at the air inlet end (namely, the end part connected with the second air supply group) of the second air supply pipe is higher than the closed end of the second air supply pipe. In this embodiment, the flowing direction of the hot air in the first air supply pipe is opposite to the flowing direction of the hot air in the second air supply pipe, so that the effect of hot air heat dislocation compensation is achieved, the position of the film corresponding to the air pipe group can be uniformly heated, and the processing quality of the film product can be ensured. In addition, the first air supply group is positioned on the side part of one end of the first air supply pipe and in the extending direction of the second air supply pipe, and the first air supply group is communicated with the side part of one end of the first air supply pipe, so that the first air supply group and the first air supply pipe form an arrangement form similar to an L shape, the first air supply pipe is conveniently detached and drawn out to the outside of the heat balance oven unit independently, and meanwhile, the first air supply pipe is conveniently sent into the heat balance oven unit to be assembled and connected with the first air supply group; similarly, the second air supply group is positioned on the side part of one end of the second air supply pipe and the extending direction of the first air supply pipe, and the second air supply group is communicated with the side part of one end of the second air supply pipe, so that the second air supply group and the second air supply pipe form an arrangement form similar to an L shape, the second air supply pipe is conveniently detached and drawn out of the thermal balance oven unit independently, and meanwhile, the second air supply pipe is conveniently fed into the thermal balance oven unit to be assembled and connected with the second air supply group. In addition, the air pipe group, the first air supply group and the second air supply group are in double L shapes and arranged in the box body in a 69 mode, the structural arrangement is compact, and the occupied space is small.

In one embodiment, the two air duct sets are arranged at intervals, and the interval between the two air duct sets is used for passing through the thin film to be processed.

In one embodiment, the number of the first air supply groups and the number of the second air supply groups are two, the two first air supply groups are arranged in one-to-one correspondence with the two air pipe groups, and the two second air supply groups are arranged in one-to-one correspondence with the two air pipe groups;

or, the first air supply group and the second air supply group are both one, the air outlets of the first air supply group are respectively communicated with the first air supply pipes of the two air pipe groups in a one-to-one correspondence manner, and the air outlets of the second air supply group are respectively communicated with the second air supply pipes of the two air pipe groups in a one-to-one correspondence manner.

In one embodiment, the number of the first air supply pipes is at least two, and the number of the second air supply pipes is at least two; the first air supply pipes and the second air supply pipes are sequentially and alternately arranged, air outlets of the first air supply group are respectively communicated with air inlet ends of at least two first air supply pipes, and air outlets of the second air supply group are respectively communicated with air inlet ends of at least two second air supply pipes.

In one embodiment, the air duct group further includes at least one straight tube disposed between the first air duct and the second air duct, a vent is disposed on a wall of the straight tube facing the film, one end of the at least one straight tube and an air inlet end of the first air duct are both communicated with an air outlet of the first air supply group, and the other end of the at least one straight tube and an air inlet end of the second air duct are both communicated with an air outlet of the second air supply group.

In one embodiment, the first blowing group comprises a first air return hood, a first static pressure box, a first fan arranged on the first static pressure box, and a first heater arranged on the first air return hood or the first static pressure box, the first static pressure box is provided with a first air return opening and a first air outlet, the first air return opening is communicated with the first air return hood, and the first air outlet is communicated with an air inlet end of the first blowing pipe; the second air supply group comprises a second air return cover, a second static pressure box, a second fan arranged on the second static pressure box and a second heater arranged on the second air return cover or the second static pressure box, the second static pressure box is provided with a second air return opening and a second air outlet, the second air return opening is communicated with the second air return cover, and the second air outlet is communicated with the air inlet end of the second air supply pipe.

In one embodiment, the heat balance oven unit further comprises two side panels, a top panel, a bottom panel and two isolation plates, wherein the two side panels, the top panel and the bottom panel are arranged oppositely, the two isolation plates are arranged oppositely, the side panels and the isolation plates are connected with the top panel, the side panels and the isolation plates are also connected with the bottom panel, and a box body is enclosed by the side panels, the isolation plates, the top panel and the bottom panel.

In one embodiment, the two air duct assemblies are arranged between the top panel and the bottom panel at intervals up and down, the first air return cover and the second air return cover are both two, one of the first air return cover and one of the second air return cover are located in an interval between one of the air duct assemblies and the top panel, and the other of the first air return cover and the other of the second air return cover are located in an interval between the other of the air duct assemblies and the bottom panel.

In one embodiment, an openable first door is arranged on one of the side panels close to the air inlet end of the first air supply pipe, the position of the side panel corresponding to the air inlet end of the first air supply pipe is provided with an openable first door, the air inlet end of the first air supply pipe is detachably connected with the first static pressure box, and the first air supply pipe is movably arranged in the box body and can move out of the box body; and a second door which can be opened is arranged on the other side panel close to the air inlet end of the second air supply pipe and at the position corresponding to the air inlet end of the second air supply pipe, the air inlet end of the second air supply pipe is detachably connected with the second static pressure box, and the second air supply pipe is movably arranged in the box body and can move out of the box body.

The film production line oven comprises more than two heat balance oven units which are sequentially arranged.

In the film production line oven, the first air supply group sends hot air into the first air supply pipe through one end of the first air supply pipe, the hot air is discharged outwards from the vent of the first air supply pipe and blows towards the film, the second air supply group sends hot air into the second air supply pipe through one end of the second air supply pipe, and the hot air is discharged outwards from the vent of the second air supply pipe and blows towards the film. Because the temperature of the hot air in the first air supply pipe gradually becomes lower along with the flowing direction, the temperature of the hot air in the second air supply pipe gradually becomes lower along with the flowing direction, namely the temperature of the hot air at the air inlet end (namely, the end part connected with the first air supply group) of the first air supply pipe is higher than the closed end of the first air supply pipe, and the temperature of the hot air at the air inlet end (namely, the end part connected with the second air supply group) of the second air supply pipe is higher than the closed end of the second air supply pipe. In this embodiment, the flowing direction of the hot air in the first air supply pipe is opposite to the flowing direction of the hot air in the second air supply pipe, so that the effect of hot air heat dislocation compensation is achieved, the position of the film corresponding to the air pipe group can be uniformly heated, and the processing quality of the film product can be ensured. In addition, the first air supply group is positioned on the side part of one end of the first air supply pipe and in the extending direction of the second air supply pipe, and the first air supply group is communicated with the side part of one end of the first air supply pipe, so that the first air supply group and the first air supply pipe form an arrangement form similar to an L shape, the first air supply pipe is conveniently detached and drawn out to the outside of the heat balance oven unit independently, and meanwhile, the first air supply pipe is conveniently sent into the heat balance oven unit to be assembled and connected with the first air supply group; similarly, the second air supply group is positioned on the side part of one end of the second air supply pipe and the extending direction of the first air supply pipe, and the second air supply group is communicated with the side part of one end of the second air supply pipe, so that the second air supply group and the second air supply pipe form an arrangement form similar to an L shape, the second air supply pipe is conveniently detached and drawn out of the thermal balance oven unit independently, and meanwhile, the second air supply pipe is conveniently fed into the thermal balance oven unit to be assembled and connected with the second air supply group. In addition, the air pipe group, the first air supply group and the second air supply group are in double L shapes and arranged in the box body in a 69 mode, the structural arrangement is compact, and the occupied space is small.

Drawings

Fig. 1 is a schematic structural view of a heat balance oven unit according to an embodiment of the present invention, in which a top panel, a bottom panel and one of the isolation plates are omitted.

Fig. 2 is an enlarged schematic view of fig. 1 at a.

Fig. 3 is a schematic structural diagram of the first air supply group and the second air supply group shared by the upper air duct group and the lower air duct group in the heat balance oven unit according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a heat balance oven unit according to an embodiment of the present invention, in which two first air supply pipes and two second air supply pipes are provided.

Fig. 5 is a schematic structural diagram of a heat balance oven unit according to an embodiment of the present invention, in which two straight pipes are disposed between a first air supply pipe and a second air supply pipe.

10. A wind pipe group; 11. a first blast pipe; 12. a second blast pipe; 13. a vent; 14. a first connecting pipe fitting; 15. a second connecting pipe fitting; 16. a straight pipe; 17. a third connecting pipe fitting; 18. a fourth connecting pipe fitting; 20. a first air supply group; 21. a first return air cover; 22. a first plenum box; 23. a first fan; 24. a first heater; 30. a second air supply group; 31. a second return air cover; 32. a second plenum box; 33. a second fan; 34. a second heater; 40. a side panel; 41. a first door; 42. a second door; 50. a separator plate; 61. a first transverse rail; 62. a first moving member; 63. a first longitudinal rail; 64. a third moving member; 71. A second transverse rail; 72. a second moving member; 73. a fourth moving member; 100. a film.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of a heat balance oven unit according to an embodiment of the present invention with a top panel, a bottom panel and one of the isolation plates 50 omitted, and fig. 2 is an enlarged schematic structural view of fig. 1 at a point a. An embodiment of the present invention provides a heat balance oven unit, including: the air duct group 10, the first air supply group 20 and the second air supply group 30. The air duct group 10 includes a first air duct 11 and a second air duct 12 which are horizontally arranged in a staggered manner. The walls of the first air supply pipe 11 and the second air supply pipe 12 facing the film 100 are provided with a plurality of ventilation openings 13. The first air supply group 20 is located at the side of one end of the first air supply pipe 11 and the top of one end of the second air supply pipe 12, the first air supply group 20 is communicated with the side of one end of the first air supply pipe 11, and the other end of the first air supply pipe 11 is a closed end. The second air supply group 30 is located on the side of one end of the second air supply pipe 12 and the extending direction of the first air supply pipe 11, the second air supply group 30 is communicated with the side of one end of the second air supply pipe 12, and the other end of the second air supply pipe 12 is a closed end. The direction of the air flow in the first air supply duct 11 is opposite to the direction of the air flow in the second air supply duct 12.

The term "horizontal arrangement" in the horizontal offset arrangement of the first air delivery duct 11 and the second air delivery duct 12 means that the first air delivery duct 11 and the second air delivery duct 12 are arranged in parallel, and both end surfaces of the first air delivery duct 11 and both end surfaces of the second air delivery duct 12 are respectively offset from each other by a gap, and the end surfaces of the first air delivery duct 11 and the end surfaces of the second air delivery duct 12 are not aligned on the same plane.

In the heat balance oven unit, the first blowing group 20 sends hot air into the first blowing pipe 11 through one end of the first blowing pipe 11, and the hot air is discharged to the outside through the vent 13 of the first blowing pipe 11 and blown to the film 100, and the second blowing group 30 sends hot air into the second blowing pipe 12 through one end of the second blowing pipe 12, and the hot air is discharged to the outside through the vent 13 of the second blowing pipe 12 and blown to the film 100. Since the temperature of the hot air in the first air supply pipe 11 is gradually lower along the flowing direction, the temperature of the hot air in the second air supply pipe 12 is gradually lower along the flowing direction, that is, the temperature of the hot air at the air inlet end of the first air supply pipe 11 (i.e., the end connected to the first air supply group 20) is higher than that of the closed end of the first air supply pipe 11, and the temperature of the hot air at the air inlet end of the second air supply pipe 12 (i.e., the end connected to the second air supply group 30) is higher than that of the closed end of the second air supply pipe 12. In this embodiment, the flowing direction of the hot air in the first air supply pipe 11 is opposite to the flowing direction of the hot air in the second air supply pipe 12, so as to achieve the effect of hot air heat dislocation compensation, and the position of the film 100 corresponding to the air pipe set 10 can be heated uniformly, thereby ensuring the processing quality of the film 100 product. In addition, since the first air supply group 20 is located on the side of one end of the first air supply pipe 11 and in the extending direction of the second air supply pipe 12, the first air supply group 20 is communicated with the side of one end of the first air supply pipe 11, so that the first air supply group 20 and the first air supply pipe 11 form an arrangement form similar to an "L" shape, which is convenient for separately disassembling and extracting the first air supply pipe 11 to the outside of the heat balance oven unit, and simultaneously, is convenient for feeding the first air supply pipe 11 into the heat balance oven unit to be assembled and connected with the first air supply group 20; similarly, the second blowing group 30 is located at the side of one end of the second blowing pipe 12 and in the extending direction of the first blowing pipe 11, and the second blowing group 30 is communicated with the side of one end of the second blowing pipe 12, so that the second blowing group 30 and the second blowing pipe 12 form an arrangement similar to an "L" shape, which also facilitates the second blowing pipe 12 to be detached and drawn out to the outside of the heat balance oven unit separately, and also facilitates the second blowing pipe 12 to be fed into the heat balance oven unit to be assembled and connected with the second blowing group 30. In addition, the air duct group 10, the first air supply group 20 and the second air supply group 30 are overall double-L-shaped and arranged in the box body in a 69 mode, so that the structural arrangement is compact, and the occupied space is small.

Referring to fig. 1 to 3, fig. 3 is a schematic structural diagram illustrating that an upper air duct group 10 and a lower air duct group 10 share a first air supply group 20 and a second air supply group 30 in a heat balance oven unit according to an embodiment of the present invention. Further, the two air duct sets 10 are arranged at intervals, and the interval between the two air duct sets 10 is used for passing through the film 100 to be processed. Specifically, two tuber pipes 10 are the interval setting from top to bottom, are provided with vent 13 on the lower side pipe wall of tuber pipe 10 above being located, and the air-out is towards the below and blows to the upside surface of film 100, is provided with vent 13 on the upside pipe wall of tuber pipe 10 below being located, and the air-out is towards the top and blows to the downside surface of film 100 to can realize that the upper and lower side of film 100 all contacts hot-blastly, it is comparatively even to be heated, can guarantee the processingquality of film 100 product.

Referring to fig. 1, two first blowing groups 20 and two second blowing groups 30 are provided in the heat balance oven unit illustrated in fig. 1. In one embodiment, there are two first blowing groups 20 and two second blowing groups 30, two first blowing groups 20 are disposed in one-to-one correspondence with two air tube groups 10, and two second blowing groups 30 are disposed in one-to-one correspondence with two air tube groups 10. Therefore, the wind pressure, the wind speed and the hot wind temperature of the two first air supply groups 20 can be mutually independent and independently adjusted, and the wind pressure, the wind speed and the hot wind temperature of the two second air supply groups 30 can be mutually independent and independently adjusted.

Referring to fig. 3 again, the first blowing group 20 and the second blowing group 30 in the heat balance oven unit illustrated in fig. 3 are both one. In another embodiment, there is one first blowing group 20 and one second blowing group 30, the air outlets of the first blowing group 20 are respectively in one-to-one communication with the first blowing pipes 11 of the two blowing pipe groups 10, and the air outlets of the second blowing group 30 are respectively in one-to-one communication with the second blowing pipes 12 of the two blowing pipe groups 10. Specifically, two air outlets of the first air supply group 20 are specifically, for example, two air outlets of the first air supply group 20 are in one-to-one correspondence with the first air supply pipes 11 of the two air pipe groups 10, two air outlets of the second air supply group 30 are specifically, for example, two air outlets of the second air supply group 30 are in one-to-one correspondence with the second air supply pipes 12 of the two air pipe groups 10. In this way, by operating one first blowing group 20 and one second blowing group 30, air can be blown synchronously for the two air duct groups 10, the structure of the heat balance oven unit can be simplified, and the device cost can be reduced.

Referring to fig. 4, fig. 4 is a schematic structural diagram illustrating a case where two first air supply pipes 11 and two second air supply pipes 12 are provided in a heat balance oven unit according to an embodiment of the present invention. In one embodiment, the number of the first air supply duct 11 is at least two, and the number of the second air supply duct 12 is at least two. The first air supply pipes 11 and the second air supply pipes 12 are alternately arranged in sequence, the air outlets of the first air supply group 20 are communicated with the air inlet ends of at least two first air supply pipes 11 respectively, and the air outlets of the second air supply group 30 are communicated with the air inlet ends of at least two second air supply pipes 12 respectively. In this embodiment, the number of the first air supply pipe 11 and the second air supply pipe 12 is not limited, and may be one, two, three or other numbers. When the number of the first air supply pipe 11 and the second air supply pipe 12 included in the heat balance oven unit is larger, the length of the heat balance oven unit along the conveying direction of the film 100 is larger, and the heat balance oven unit with a relatively long length is suitable for the heat setting section and the cooling section (the temperature of the heat setting section and the cooling section is basically kept unchanged) because the temperature of each part in the heat balance oven unit is uniform; when the number of the first air supply pipe 11 and the second air supply pipe 12 included in the heat balance oven unit is small, for example, the number of the first air supply pipe 11 and the number of the second air supply pipe 12 are both one, the length of the heat balance oven unit along the conveying direction of the film 100 will be reduced, and the length size of the heat balance oven unit can be greatly reduced under the condition of the optimal wind speed and wind pressure in the staggered hot air environment (the length size can be reduced to 50% of the traditional heat balance oven unit, namely the length of the reduced heat balance oven unit is 1.5 meters), so that the requirement that the temperature gradient between the units along the line is gradually changed when the film 100 is processed (for example, preheating processing) is met.

Particularly, in order to facilitate the realization that the air outlets of the first air supply group 20 are respectively communicated with the air inlet ends of the at least two first air supply pipes 11, the heat balance oven unit further comprises a first connecting pipe 14 arranged between the air inlet ends of the first air supply group 20 and the at least two first air supply pipes 11, the air outlets of the first air supply group 20 are communicated with the air inlets of the first connecting pipe 14, and the at least two air outlets of the first connecting pipe 14 are respectively communicated with the air inlet ends of the at least two first air supply pipes 11 in a one-to-one correspondence manner. Similarly, in order to facilitate the air outlets of the second air supply group 30 to be respectively communicated with the air inlet ends of the at least two second air supply pipes 12, the heat balance oven unit further includes a second connecting pipe 15 disposed between the second air supply group 30 and the air inlet ends of the at least two second air supply pipes 12. The air outlets of the second air supply group 30 are communicated with the air inlets of the second connecting pipe fittings 15, and at least two air outlets of the second connecting pipe fittings 15 are respectively communicated with the air inlet ends of at least two second air supply pipes 12 in a one-to-one correspondence manner.

Referring to fig. 5, fig. 5 is a schematic structural diagram illustrating a case where two straight pipes 16 are disposed between the first air supplying pipe 11 and the second air supplying pipe 12 in the heat balance oven unit according to an embodiment of the present invention. In one embodiment, the air duct set 10 further comprises at least one straight duct 16 arranged between the first air duct 11 and the second air duct 12. The wall of the straight pipe 16 facing the film 100 is provided with a vent 13, one end of at least one straight pipe 16 and the air inlet end of the first air supply pipe 11 are both communicated with the air outlet of the first air supply group 20, and the other end of at least one straight pipe 16 and the air inlet end of the second air supply pipe 12 are both communicated with the air outlet of the second air supply group 30. The straight pipe 16 is different from the first air supply pipe 11 and the second air supply pipe 12 in that both ends of the straight pipe 16 can be ventilated.

In this embodiment, the number of the straight tubes 16 is not limited, and may be one, two, three, or other numbers. When the number of the straight pipes 16 included in the heat balance oven unit is larger, the length of the heat balance oven unit along the conveying direction of the film 100 is larger, and because the temperature of each part in the heat balance oven unit is uniform, the heat balance oven unit with a relatively longer length is suitable for the heat setting section and the cooling section (the temperature of the heat setting section and the cooling section is basically kept unchanged); when the number of straight tubes 16 included in the heat balance oven unit is small or no straight tubes 16 are provided, the length of the heat balance oven unit along the conveying direction of the film 100 is reduced to meet the requirement of gradual temperature gradient between the line units when the film 100 is processed (for example, preheating processing).

Specifically, in order to facilitate the air outlets of the first air supply group 20 to be respectively communicated with one end of at least one straight pipe 16 and the air inlet end of the first air supply pipe 11, the heat balance oven unit further includes a third connecting pipe 17, the air outlets of the first air supply group 20 are communicated with the air inlets of the third connecting pipe 17, and at least two air outlets of the third connecting pipe 17 are respectively communicated with one end of at least one straight pipe 16 and the air inlet end of the first air supply pipe 11 in a one-to-one correspondence manner. Similarly, in order to facilitate the air outlet of the second air supply group 30 to be respectively communicated with the other end of the at least one straight pipe 16 and the air inlet end of the second air supply pipe 12, the heat balance oven unit further includes a fourth connecting pipe 18. The air outlet of the second air supply group 30 is communicated with the air inlet of a fourth connecting pipe fitting 18, and at least two air outlets of the fourth connecting pipe fitting 18 are respectively communicated with the other end of at least one straight pipe 16 and the air inlet end of the second air supply pipe 12 in a one-to-one correspondence manner.

Referring to fig. 1 and 3, in an embodiment, the first blowing group 20 includes a first air return hood 21, a first plenum box 22, a first fan 23 disposed on the first plenum box 22, and a first heater 24 disposed on the first air return hood 21 or the first plenum box 22. The first static pressure box 22 is provided with a first air return opening and a first air outlet, the first air return opening is communicated with the first air return cover 21, and the first air outlet is communicated with the air inlet end of the first air supply pipe 11. The second air supply group 30 includes a second air return cover 31, a second static pressure box 32, a second fan 33 disposed on the second static pressure box 32, and a second heater 34 disposed on the second air return cover 31 or the second static pressure box 32, the second static pressure box 32 is provided with a second air return opening and a second air outlet, the second air return opening is communicated with the second air return cover 31, and the second air outlet is communicated with an air inlet end of the second air supply pipe 12. Therefore, the first heater 24 and the second heater 34 can heat the hot air flow, so that heat loss of the hot air flow in the process of heating the film 100 is supplemented, the temperature of the hot air flow is within a preset range, and the processing quality of the film 100 is guaranteed. The specific structure of the first heater 24 and the second heater 34 is not limited, and may be, for example, heating wires, heating rods, heating pipes or heat exchangers, and the like. In addition, the first heater 24 is located at one end of the air duct assembly 10, the second heater 34 is located at the other end of the air duct assembly 10, and compared with a traditional heater which is arranged at the middle part of the top surface of the heat balance oven unit, the first heater 24 is relatively close to the air inlet end of the first air supply duct 11, and the second heater 34 is relatively close to the air inlet end of the second air supply duct 12, and in addition, the air flow direction of the first air supply duct 11 is opposite to the air flow direction of the second air supply duct 12, so that not only can each part of the film 100 be heated uniformly, but also the temperature of each part of the film 100 can be accurately controlled within +/-1 ℃, compared with the traditional temperature which is accurate within +/-2 ℃, the temperature accuracy is greatly improved, the film heating device is suitable for processing and manufacturing of high-end films 100, and the product quality of the film 100.

Referring to fig. 1, 4 or 5, further, the first air blowing group 20 is located at one side of the air inlet end of the first air blowing pipe 11 and located in the extending direction of the second air blowing pipe 12, and the cover opening of the first air returning cover 21 faces the area of the side of the second air blowing pipe 12 departing from the film 100. The second air supply group 30 is located on one side of the air inlet end of the second air supply pipe 12 and is located in the extending direction of the first air supply pipe 11, and the cover opening of the second air return cover 31 faces the area of the first air supply pipe 1 deviating from the side of the film 100. Therefore, the cover openings of the first air return cover 21 and the second air return cover 31 are arranged in a staggered manner, so that the air in the heat balance oven unit can flow back to the first air supply group 20 through the first air return cover 21 and flow back to the second air supply group 30 through the second air return cover 31 respectively, and then flow into the first air supply pipe 11 and the second air supply pipe 12 respectively, so that staggered convection air is blown to the film 100. In addition, since the first air supply group 20 is located at one side of the air inlet end of the first air supply pipe 11, the first air supply group 20 and the first air supply pipe 11 form an arrangement form similar to an L shape, so that the first air supply pipe 11 can be detached and extracted to the outside of the heat balance oven unit independently, and meanwhile, the first air supply pipe 11 can be fed into the heat balance oven unit to be assembled and connected with the first air supply group 20; similarly, since the second air supply group 30 is located at one side of the air inlet end of the second air supply pipe 12, the second air supply group 30 and the second air supply pipe 12 form an arrangement similar to an "L" shape, which also facilitates the disassembly and extraction of the second air supply pipe 12 to the outside of the thermal balance oven unit separately, and also facilitates the assembly and connection of the second air supply pipe 12 into the thermal balance oven unit and the second air supply group 30.

It should be noted that the fact that the cover opening of the first air return cover 21 faces the area of the second air supply pipe 12 on the side away from the film 100 means that when the second air supply pipe 12 is located in the upper area of the film 100, the area of the second air supply pipe 12 on the side away from the film 100 is the upper area of the second air supply pipe 12, and at this time, the cover opening of the first air return cover 21 faces the upper area of the second air supply pipe 12, and the air flow in the upper area of the second air supply pipe 12 can be sucked into the first air return cover 21; when the second air supply pipe 12 is located in the lower area of the film 100, the area of the second air supply pipe 12 away from the film 100 is the lower area of the second air supply pipe 12, and at this time, the cover opening of the first air return cover 21 faces the lower area of the second air supply pipe 12, so that the airflow in the lower area of the second air supply pipe 12 can be sucked into the first air return cover 21.

The explanation of the area of the second return hood 31 where the hood opening faces the side of the first supply duct 1 facing away from the membrane 100 is similar and not limited herein.

Further, the heat balance oven unit further comprises two side panels 40 which are arranged oppositely, a top panel and a bottom panel which are arranged oppositely, and two isolation plates 50 which are arranged oppositely, wherein the side panels 40 and the isolation plates 50 are connected with the top panel, the side panels 40 and the isolation plates 50 are also connected with the bottom panel, and the side panels 40, the isolation plates 50, the top panel and the bottom panel are enclosed to form a box body.

The two air duct groups 10 are disposed between the top panel and the bottom panel at an interval from top to bottom, the first air return hoods 21 and the second air return hoods 31 are both two, one of the first air return hoods 21 and one of the second air return hoods 31 are located in an interval between one of the air duct groups 10 and the top panel, and the other one of the first air return hoods 21 and the other one of the second air return hoods 31 are located in an interval between the other one of the air duct groups 10 and the bottom panel.

Generally, the conventional thermal balance oven unit is fully distributed with static pressure boxes symmetrically on both sides along the moving direction of the film 100, and the designed concept that the inner space formed by the static pressure boxes is sufficiently distributed with upper and lower convection air ducts uniformly can realize the shortest distance from a hot air source to the heat exchange area of the film 100, and the upper and lower air duct groups 10 can also cover the area of the film 100 along the line as much as possible, so that the thermal balance oven unit can be more suitable for a narrow body thermal balance oven unit (namely, the thermal balance oven unit with smaller length dimension, specifically, 2m or 3 m). However, the film production line oven needs maintenance personnel to perform regular maintenance or fault treatment on the interior of the film production line oven, and static pressure boxes fixedly installed and hot air pipelines located in the heat balance oven unit are densely distributed on two sides of the film production line oven, so that the workers have no operating space to treat maintenance work inside the heat balance oven unit, especially the internal environment of the narrow body heat balance oven unit.

Based on this, referring to fig. 1 and fig. 2, an openable first door 41 is disposed on a portion of one of the side panels 40 close to the air inlet end of the first air supply pipe 11, which corresponds to the air inlet end of the first air supply pipe 11. The air inlet end of the first blast pipe 11 is detachably connected with the first static pressure box 22, and the first blast pipe 11 is movably arranged in the box body and can move to the outside of the box body. The other side panel 40 close to the air inlet end of the second air supply pipe 12 is provided with an openable second door 42 at a position corresponding to the air inlet end of the second air supply pipe 12. The air inlet end of the second blast pipe 12 is detachably connected with the second static pressure box 32, and the second blast pipe 12 is movably arranged in the box body and can move to the outside of the box body. Therefore, when the chain clamp device and the like in the heat balance oven unit need to be maintained and cleaned, the first door 41 can be opened, the air inlet end of the first air supply pipe 11 is detached from the first static pressure box 22, the first air supply pipe 11 is moved out of the box body, the first air supply pipe 11 just penetrates through the door of the side panel 40 and is pulled out of the box body, and therefore a large enough space is formed in the box body for workers to enter the box body for maintenance and cleaning. Similarly, the second door 42 can be opened, and then the air inlet end of the second air supply pipe 12 is detached from the second static pressure box 32, and the second air supply pipe 12 is removed from the box body, and the second air supply pipe 12 is just drawn out of the box body through the door of the side panel 40, so that there is enough space in the box body for workers to enter for maintenance, cleaning and other operations.

Referring to fig. 1 and 2, since the air inlet end of the first air supply pipe 11 is opposite to the first door 41, the first air supply pipe 11 can be conveniently drawn out from the box body after the first door 41 is opened. Because the air inlet end of the second air supply pipe 12 is opposite to the second door 42, the second air supply pipe 12 can be conveniently drawn out from the box body after the second door 42 is opened.

It should be noted that the opening area of the first door 41 completely covers the air inlet end of the first air delivery pipes 11 of the upper and lower air pipe groups 10, so that the two first air delivery pipes 11 arranged at intervals up and down can be directly seen by opening the first door 41, and the two first air delivery pipes 11 arranged at intervals up and down can be drawn out of the box body. Specifically, the width of the first door 41 is, for example, 500mm, the height of the first door 41 is, for example, 1500mm, the width of the first air supply duct 11 is, for example, 300mm, the height of the first air supply duct 11 is, for example, 400mm, and the interval between the two first air supply ducts 11 is, for example, 300mm to 400 mm.

Similarly, the opening area of the second door 42 completely covers the air inlet ends of the second air supply pipes 12 of the upper and lower air pipe groups 10, so that the two second air supply pipes 12 arranged at intervals up and down can be directly seen by opening the second door 42, and the two second air supply pipes 12 arranged at intervals up and down can be drawn out of the box body. Specifically, the width of the second door 42 is, for example, 500mm, the height of the second door 42 is, for example, 1500mm, the width of the second air delivery duct 12 is, for example, 300mm, the height of the second air delivery duct 12 is, for example, 400mm, and the interval between the two second air delivery ducts 12 is, for example, 300mm to 400 mm.

Referring to fig. 1 and 2, the heat balance oven unit further includes two first sliding assemblies, the two first sliding assemblies are respectively disposed corresponding to the two first air supply pipes 11, and the first air supply pipes 11 are movably disposed in the box body through the first sliding assemblies. Thus, the first air supply pipe 11 can be moved conveniently through the first sliding assembly, and the first air supply pipe 11 is disassembled and assembled in the box body.

Similarly, the thermal balance oven unit further includes two second sliding assemblies, the two second sliding assemblies are respectively disposed in one-to-one correspondence with the two second air supply pipes 12, and the second air supply pipes 12 are movably disposed in the box body through the second sliding assemblies. In this way, the second air supply duct 12 can be moved easily by the second slide unit, and the second air supply duct 12 can be attached to and detached from the casing.

Referring to fig. 1 and 2, further, the first sliding assembly includes a first transverse rail 61 and a first moving member 62. The first transverse rail 61 is arranged in the same direction as the axial direction of the first air delivery pipe 11, the first moving member 62 is movably arranged on the first transverse rail 61, and the first moving member 62 is connected with the first air delivery pipe 11. The number of the first moving parts 62 is more than one, for example, one, two, three or more, but not limited to the number. Thus, when the first air supply pipe 11 is pushed or pulled, the first air supply pipe 11 can be pulled out of the box body by moving along the first transverse rail 61.

Similarly, the second sliding assembly includes a second transverse rail 71 and a second moving member 72. The second transverse rail 71 is arranged in the same direction as the axial direction of the second air delivery pipe 12, the second moving member 72 is movably arranged on the second transverse rail 71, and the second moving member 72 is connected with the second air delivery pipe 12. The number of the second moving parts 72 is more than one, for example, one, two, three or more, but not limited to the number. Thus, when the second air supply duct 12 is pushed or pulled, the second air supply duct 12 moves along the second transverse rail 71 and can be pulled out of the casing.

Referring to fig. 1 and 2, further, the first sliding assembly further includes a first longitudinal rail 63 and a third moving member 64. The first longitudinal rail 63 is disposed along the feeding direction of the film 100, i.e., perpendicular to the axial direction of the first blowing duct 11, the third moving member 64 is movably disposed on the first longitudinal rail 63, and the third moving member 64 is connected to the first transverse rail 61. The number of the third moving parts 64 is more than one, for example, one, two, three or more, but not limited to the number. Therefore, the first transverse rail 61 can be moved along the direction of the first longitudinal rail 63, so that the position of the first air supply pipe 11 in the longitudinal direction can be correspondingly adjusted, the first air supply pipe 11 can be far away from or close to the first static pressure box 22, the first air supply pipe 11 can be conveniently disassembled and assembled, and the air inlet end of the first air supply pipe 11 can be conveniently abutted by the side panel 40 and cannot be moved out of the box body.

Similarly, the second sliding assembly further comprises a second longitudinal rail and a fourth moving member 73. The second longitudinal rail is disposed along the conveying direction of the film 100, i.e., perpendicular to the axial direction of the second air delivery duct 12, and the fourth moving member 73 is movably disposed on the second longitudinal rail, and the fourth moving member 73 is connected to the second transverse rail 71. The number of the fourth moving parts 73 is one or more, for example, one, two, three or more, but not limited to the number. Therefore, the second transverse rail 71 can be moved along the direction of the second longitudinal rail, so that the position of the second air supply pipe 12 in the longitudinal direction can be correspondingly adjusted, the second air supply pipe 12 can be far away from or close to the second static pressure box 32, the disassembly and assembly operation of the second air supply pipe 12 is facilitated, and the air inlet end of the second air supply pipe 12 is abutted by the side panel 40 and cannot be moved out of the box body.

It should be noted that the first longitudinal rail 63 and the second longitudinal rail may be two independent rails, or may share the same rail, and when the same rail is shared, the structure of the heat balance oven unit is simpler. As shown in fig. 1, the first longitudinal rail 63 and the second longitudinal rail are a common rail.

Further, the first longitudinal rail 63 and the second longitudinal rail are both fixedly arranged in the box body. Specifically, for example, two ends of the first longitudinal rail 63 are respectively fixed on the front and rear partition plates 50 of the thermal balance oven unit, and two ends of the second longitudinal rail are respectively fixed on the front and rear partition plates 50 of the thermal balance oven unit.

In one embodiment, a film production line oven comprises two or more heat balance oven units according to any one of the embodiments, wherein the two or more heat balance oven units are arranged in sequence.

In the film production line oven, the first air supply group 20 supplies hot air into the first air supply pipe 11 through one end of the first air supply pipe 11, the hot air is discharged to the outside through the vent 13 of the first air supply pipe 11 and is blown to the film 100, the second air supply group 30 supplies hot air into the second air supply pipe 12 through one end of the second air supply pipe 12, and the hot air is discharged to the outside through the vent 13 of the second air supply pipe 12 and is blown to the film 100. Since the temperature of the hot air in the first air supply pipe 11 is gradually lower along the flowing direction, the temperature of the hot air in the second air supply pipe 12 is gradually lower along the flowing direction, that is, the temperature of the hot air at the air inlet end of the first air supply pipe 11 (i.e., the end connected to the first air supply group 20) is higher than that of the closed end of the first air supply pipe 11, and the temperature of the hot air at the air inlet end of the second air supply pipe 12 (i.e., the end connected to the second air supply group 30) is higher than that of the closed end of the second air supply pipe 12. In this embodiment, the flowing direction of the hot air in the first air supply pipe 11 is opposite to the flowing direction of the hot air in the second air supply pipe 12, so as to achieve the effect of hot air heat dislocation compensation, and the position of the film 100 corresponding to the air pipe set 10 can be heated uniformly, thereby ensuring the processing quality of the film 100 product. In addition, since the first air supply group 20 is located on the side of one end of the first air supply pipe 11 and in the extending direction of the second air supply pipe 12, the first air supply group 20 is communicated with the side of one end of the first air supply pipe 11, so that the first air supply group 20 and the first air supply pipe 11 form an arrangement form similar to an "L" shape, which is convenient for separately disassembling and extracting the first air supply pipe 11 to the outside of the heat balance oven unit, and simultaneously, is convenient for feeding the first air supply pipe 11 into the heat balance oven unit to be assembled and connected with the first air supply group 20; similarly, the second blowing group 30 is located at the side of one end of the second blowing pipe 12 and in the extending direction of the first blowing pipe 11, and the second blowing group 30 is communicated with the side of one end of the second blowing pipe 12, so that the second blowing group 30 and the second blowing pipe 12 form an arrangement similar to an "L" shape, which also facilitates the second blowing pipe 12 to be detached and drawn out to the outside of the heat balance oven unit separately, and also facilitates the second blowing pipe 12 to be fed into the heat balance oven unit to be assembled and connected with the second blowing group 30. In addition, the air duct group 10, the first air supply group 20 and the second air supply group 30 are overall double-L-shaped and arranged in the box body in a 69 mode, so that the structural arrangement is compact, and the occupied space is small.

It should be noted that two adjacent heat balance oven units may share the same isolation plate 50, and of course, one isolation plate 50 may be used in each, all of which are within the protection scope of the present invention and are not limited herein.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.