阅读说明：本技术 干燥箱及流水线 (Drying cabinet and assembly line ) 是由 周鑫 李若阳 赖永练 范昆亮 龚彪 陈智远 于 2020-05-20 设计创作，主要内容包括：本发明涉及干燥装置,尤其公开了一种干燥箱及流水线。干燥箱包括：箱体,箱体的内部能够被加热；驱动装置和传动部,传动部用于承载物料,传动部在箱体内以曲线路径移动,驱动装置驱动传动部在箱体中运动设定时间后,从箱体中移出。由于传动部在箱体内以曲线式移动,所以位于箱体中的物料在箱体中运动的路程一定的前提下,由于曲线式的路径能够在箱体中弯曲设置,所以上述结构能够减少干燥物料对箱体长度的需求。(The invention relates to a drying device, and particularly discloses a drying box and a production line. The drying cabinet includes: a case, an inside of which can be heated; the transmission part moves in the box body along a curved path, and the driving device drives the transmission part to move out of the box body after moving in the box body for a set time. Because the transmission part moves in a curve manner in the box body, the requirement of drying materials on the length of the box body can be reduced due to the fact that the curve type path can be arranged in the box body in a bending manner on the premise that the path of the materials in the box body is fixed.)

1. A drying cabinet, comprising:

a case, an inside of which can be heated;

the transmission mechanism comprises a driving device and a transmission part, the transmission part is used for bearing materials, the transmission part moves in the box body along a curved path, and the driving device drives the transmission part to move out of the box body after moving along the curved path in the box body.

2. The cabinet of claim 1, wherein the drive is configured to move helically within the cabinet.

3. The drying cabinet according to claim 2, wherein the transmission portion includes a first spiral path and a second spiral path, the transmission portion flows through the first spiral path and the second spiral path, the first spiral path includes a first start point and a first end point, the first spiral path is arranged spirally rising from the first start point to the first end point, the second spiral path includes a second start point and a second end point, the second spiral path is arranged spirally falling from the second start point to the second end point, the first spiral path and the second spiral path are arranged side by side, the first end point is communicated with the second start point, the first start point and the second end point are communicated, and the driving device is located at a position of an arc formed by the first start point and the second end point.

4. The cabinet of claim 3, wherein the first spiral path has a first turn at a bottom layer thereof, the second spiral path has a second turn at a bottom layer thereof, the first start point is located at an end of the first turn, the second end point is located at an end of the second turn, the second turn has a height lower than that of the first turn, and the first start point and the second end point are equal in height.

5. The drying cabinet of claim 3, wherein the driving device comprises a first driving member and a second driving member, the second driving member can be sleeved on an output shaft of the first driving member, and the second driving member can be matched with the transmission part and drive the transmission part to move.

6. The cabinet of claim 5, wherein the drive mechanism includes a plurality of guides disposed at the turns of the first spiral path and the second spiral path.

7. The cabinet according to claim 6, wherein a plurality of said guides are connected to each of said first shaft, said second shaft, said third shaft and said fourth shaft, said guides on said first shaft and said second shaft are connected to said transmission part moving to said first spiral path, said guides on said first shaft and said second shaft are arranged to be staggered in height, said guides on said third shaft and said fourth shaft are connected to said transmission part moving to said second spiral path, and said guides on said third shaft and said guides on said fourth shaft are arranged to be staggered in height.

8. The cabinet of claim 1, further comprising an adjustment device that can adjust the drive section to place the drive section in tension.

9. The drying cabinet of claim 8, wherein the adjusting device comprises a slider and a screw rod, the screw rod can be connected with the slider in a matching manner and drives the slider to move relative to the cabinet body, a positioning part is connected to the slider, and part of the transmission part is wound on the positioning part;

or, the adjusting device comprises a sliding block and a third driving piece, the sliding block is provided with a positioning piece, part of the transmission part is wound on the positioning piece, the output end of the third driving piece is connected with the sliding block, and the third driving piece drives the sliding block to move relative to the box body;

or, the adjusting device comprises a sliding block, a third driving piece, a screw rod and a pushing piece, the screw rod and the third driving piece can be connected with the box body, the screw rod and the pushing piece are connected in a matched mode, a positioning piece is arranged on the sliding block and used for being connected with the transmission part, the pushing piece can push the sliding block to slide along the box body relative to the other end of the screw rod, the sliding block is connected with the output end of the third driving piece relative to the other end of the pushing piece, and the third driving piece can drive the sliding block to move along the box body.

10. A line comprising heating means and a drying box according to any one of claims 1 to 9.

Technical Field

The invention relates to a drying device, in particular to a drying box and an assembly line.

Background

The drying oven is widely applied to industrial production as a common processing device, materials are usually dried through the drying oven, set time is needed, the conventional drying oven is provided with a production line capable of conveying the materials to be dried to pass through the inside of the drying oven, and when drying operation is carried out, the materials are dried when moving in the oven body. When the drying time required for the material is long, the length of the cabinet of the drying cabinet needs to be long enough, and therefore, the drying cabinet occupies a large area.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the drying box and the production line, which can reduce the requirement on the length of the box body in production.

The invention provides a drying box, comprising:

a case, an inside of which can be heated;

the transmission part moves in the box body along a curved path, and the driving device drives the transmission part to move out of the box body after moving along the curved path in the box body.

The drying box provided by the embodiment of the invention at least has the following beneficial effects: because the transmission part moves in a curve manner in the box body, the requirement of drying materials on the length of the box body can be reduced due to the fact that the curve type path can be arranged in the box body in a bending manner on the premise that the path of the materials in the box body is fixed.

According to other embodiments of the drying box, the drying box is arranged in the box body in a spiral mode.

According to the drying box of other embodiments of the present invention, the driving device includes a first driving member and a second driving member, the second driving member can be sleeved on the output shaft of the first driving member, and the second driving member can be matched with the transmission portion and drive the transmission portion to move.

According to other embodiments of the drying box of the invention, the box body comprises a plurality of guide members, and each guide member can be matched and connected with the transmission part.

According to other embodiments of the drying cabinet of the present invention, the partial guides are coaxially disposed and rotate in synchronization.

According to other embodiments of the invention, the drying oven further comprises an adjusting device, wherein the adjusting device can adjust the transmission part to enable the transmission part to be in a tensioning state.

According to the drying box of other embodiments of the invention, the adjusting device comprises a sliding block and a screw rod, the screw rod is connected with the box body, the sliding block is provided with a positioning piece, the positioning piece is used for being connected with the transmission part, and the screw rod can be connected with the sliding block in a matched manner and drives the sliding block to move relative to the box body;

or the adjusting device comprises a sliding block and a third driving piece, a positioning piece is arranged on the sliding block and used for being connected with the transmission part, the output end of the third driving piece is connected with the sliding block, and the third driving piece drives the sliding block to move relative to the box body;

or the adjusting device comprises a sliding block, a third driving piece, a screw rod and a pushing piece, the screw rod and the third driving piece can be connected with the box body, the screw rod is connected with the pushing piece in a matched mode, a positioning piece is arranged on the sliding block and used for being connected with the transmission part, the pushing piece can push the sliding block to slide along the box body relative to the other end of the screw rod, the sliding block is connected with the output end of the third driving piece relative to the other end of the pushing piece, and the third driving piece can drive the sliding block to move.

According to other embodiments of the invention, the drying box further comprises a pipeline, the pipeline is located in the box body, the box body comprises a first port, the first port is communicated with a second port at one end of the pipeline, the pipeline is provided with a plurality of air outlet holes, and the air outlet holes are communicated with the inside of the box body.

According to the drying box of other embodiments of the present invention, the box body is provided with a second opening, the second opening is used for the transmission portion to enter and exit the box body, the second opening is provided with an air curtain machine, or the second opening is provided with a curtain.

The invention also provides a production line which comprises the heating device and the drying box, wherein the heating device is used for conveying heat in the drying box.

Drawings

FIG. 1 is a schematic view of a drying cabinet;

FIG. 2 is a schematic view of the internal mechanism of FIG. 1;

FIG. 3 is a schematic view of the drive path of the drive section of FIG. 2;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is another angular configuration of FIG. 3;

FIG. 6 is a right side view of FIG. 1 (with parts omitted);

FIG. 7 is an enlarged schematic view of area A of FIG. 1;

FIG. 8 is a top view of FIG. 2;

fig. 9 is a schematic diagram of a pipeline architecture.

Reference numerals: the device comprises a box body 101, a frame body 102, a second opening 103, a first opening 104, a transmission part 201, a first spiral path 202, a second spiral path 203, a pipeline 204, a guide piece 205, a support frame 207, a carrier 208, a material 209, an air outlet 210, a first shaft 211, a second shaft 212, a third shaft 213, a fourth shaft 214, a first starting point 301, a first end point 302, a second starting point 303, a second end point 304, a first ring 305, a second ring 306, a first driving piece 401, an air curtain machine 402, a third opening 403, a second driving piece 404, an adjusting device 601, a sliding block 602, a lead screw 603, a third driving piece 604, a positioning piece 605, a pushing piece 606 and a heating device 701.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it may be directly disposed, fixed, or connected to the other feature or may be indirectly disposed, fixed, connected, or mounted to the other feature. In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

Referring to fig. 1, 2 and 3, as an embodiment of the drying oven, the drying phase includes a box 101, a transmission mechanism and a transmission portion 201, the transmission mechanism includes a driving device, the driving device is used for driving the transmission portion 201 to move in the box 101, the drying oven is used for heating a material 209 located inside the drying oven, so that an adhesive coated on the material 209 can be solidified quickly, the drying oven further includes a plurality of supporting frames 207, and the supporting frames 207 are connected with an inner wall of the box 101 and are used for supporting the transmission portion 201 moving in the drying oven. A carrier 208 may be disposed on the transmission portion 201, the carrier 208 is used to carry a material 209 (the material 209 is coated with an adhesive to be solidified), and the transmission portion 201 can move in a curved path in the box 101. Because the material needs the dry time of setting for, just can reach required drying effect, therefore, under the invariable condition of conveying speed, the total length of material at the inside transport route of drying cabinet is set for, transmission 201 can make the material along with the curvilinear path motion in box 101, this kind of setting can be so that guaranteeing under the unchangeable condition of transmission route length, can effectively reduce box 101 length, thereby under the condition that satisfies the dry time demand, can reduce the requirement to box 101 length in the production, help the rational planning to production assembly line at length direction area occupied.

The transmission part 201 can move in a spiral shape in the box 101, or the moving path of the transmission part 201 can be a path formed by connecting a plurality of spiral structures transversely or longitudinally, it is contemplated that the transmission portion 201 may have other curved paths as long as the normal transmission of the transmission portion 201 is ensured, and as an embodiment, the transmission portion 201 moves spirally in the case 101, as shown in fig. 2 and 3 (the transmission part 201 shown in fig. 2 and 3 is simplified by lines), the moving path of the transmission part 201 includes a first spiral path 202 and a second spiral path 203, the first spiral path 202 and the second spiral path 203 are curved from top to bottom, a three-dimensional winding path is formed in the box body, so that the upper space is fully utilized, the planar floor area of the box body 101 can be reduced, and the reasonable planning of the floor area of the production line is facilitated. The two spiral structures are connected to each other and communicate with the outside of the box 101 through a second port 103 located on the box 101.

As an embodiment, the first spiral path 202 includes a first starting point 301 and a first ending point 302, the second spiral path 203 includes a second starting point 303 and a second ending point 304, the transmission part 201 transmits in the box 101 sequentially through the first starting point 301, the first ending point 302, the second starting point 303 and the second ending point 304, the first ending point 302 and the second starting point 303 are connected, and from the first starting point 301 to the first ending point 302, the first spiral path 202 spirals upward, and from the second starting point 303 to the second ending point 304, the second spiral path 203 spirals downward. Referring to fig. 2 and 3, the first starting point 301 and the second ending point 304 extend from the inside of the casing 101 to the outside of the casing 101, and the transmission part 201 moving to the first starting point 301 and the second ending point 304 is connected to the driving device.

As shown in fig. 3 to 5, as an example, the bottom layer of the first spiral path 202 is a first turn 305, the bottom layer of the second spiral path 203 is a second turn 306, the first starting point 301 is located on the first turn 305, the second ending point 304 is located on the second turn 306, the height of the second turn 306 is lower than that of the first turn 305, as can be seen from fig. 3 to 5, after the second spiral path 203 is wound for the same number of turns as the first spiral path 202, the position B shown in fig. 4 and 5 is reached, but if B is the same height as the second terminus 304, the first start point 301 and the second end point 304 cannot be located at the same level, which is constructed such that the transmission part 201 moved to the positions of the first start point 301 and the second end point 304 cannot be well attached to the driving device, therefore, the second spiral path 203 also extends one turn, i.e. the second turn 306, after B, so that the first starting point 301 and the second ending point 304 are kept at the same height.

The casing 101 may have any shape as long as it can accommodate the transmission of the transmission unit 201.

Every support frame 207 all is connected with the inner wall of box 101, and support frame 207 can be the bar, also can be curved shape, and the shape of all support frames 207 can be the same, also can be different, as long as can play the supporting role to transmission portion 201, and can guarantee transmission portion 201 can, support frame 207 can with box 101 fixed connection, also can adopt detachable connected mode, and this structure does not do the restriction in this scheme. The supporting frame 207 not only supports the transmission part 201, but also can be provided with a groove body on the supporting frame 207 to limit the movement of the transmission part 201.

As another embodiment, the driving device includes a first driving element 401 and a second driving element 404, the second driving element 404 is sleeved on an output shaft of the first driving element 401, and the first driving element 401 provides power to the second driving element 404, so that the second driving element 404 rotates, and the second driving element 404 can be connected to a part of the transmission portion 201, and drives the transmission portion 201 to move continuously through the second driving element 404. As shown in fig. 1, fig. 7 and fig. 8, only a part of the structure of the transmission part 201 is shown, and the movement path of the transmission part 201 is shown by a dotted line, as shown in the figure, a frame body 102 is provided outside the box body 101, a first driving member 401 and a second driving member 404 are connected to the frame body 102, and the second driving member 404 can rotate relative to the frame body 102 and provide motive power for the transmission part 201, so that the transmission part 201 can carry the material 209 into the box body 101 or move out of the box body 101. As an example, the first driving member 401 is a motor, the second driving member 404 is a chain, and the transmission portion 201 is a sprocket. It is conceivable that, as another embodiment, the second driving member 404 may also be a claw disk, and the transmission portion 201 is provided with a plurality of detents, and the rotation of the claws on the claw disk drives the detents on the transmission portion 201 to move, so that the second driving member 404 drives the transmission portion 201 to move. It is conceivable as an embodiment of the present solution as long as the corresponding structure for driving the transmission part 201 to move by the rotating second driving member 404 can be accomplished.

As another embodiment, as shown in fig. 2 and fig. 6, the transmission mechanism further includes a plurality of guiding members 205, each guiding member 205 is connected to a portion of the transmission portion 201, and guides the transmission direction of the transmission portion 201, and the guiding members are located at positions where the transmission portion needs to turn, so that the transmission portion 201 passing through the guiding members 205 can rotate in the direction, as an embodiment, the guiding members 205 are sprockets, the transmission portion 201 is a chain, and the sprockets guide the chain through the connection relationship between the sprockets and the chain in the box 101, as an embodiment, a portion of the guiding members 205 are coaxially arranged and rotate synchronously, as shown in fig. 2 and fig. 6, a portion of the guiding members 205 are connected to the same connecting shaft, and rotate synchronously, a plurality of connecting shafts may be arranged in the box 101, each connecting shaft is connected to a plurality of the guiding members 205, and all of the connecting shafts rotate synchronously, so that all the guides 205 guide the transmission 201 synchronously.

As an example, as shown in fig. 2, the connecting shaft includes a first shaft 211, a second shaft 212, a third shaft 213 and a fourth shaft 214, each of which is sleeved with a plurality of guide members 205, the guide members 205 on the first shaft 211 and the second shaft 212 guide the transmission part 201 moving to the first spiral path 202, and the guide members 205 on the third shaft 213 and the fourth shaft 214 guide the transmission part 201 moving to the second spiral path 203, as shown in fig. 2 and 4, the guide members 205 on the second shaft 212 are in one-to-one correspondence with the guide members 205 on the first shaft 211, and for the two corresponding guide members 205, the height of the guide member 205 on the second shaft 212 is higher than that of the guide member 205 on the first shaft 211, such a structure that the transmission part 201 passing through the first spiral path 202 can spirally ascend, and similarly, the guide members 205 on the third shaft 213 and the fourth shaft 214 are in one-to-one correspondence, the guide 205 on the third shaft 213 is higher in height than the corresponding guide 205 on the fourth shaft 214.

As another embodiment, the drying oven further comprises an adjusting device 601, the adjusting device 601 is used for adjusting the tightness of the transmission part 201 located in the box 101, the transmission part 201 is in a stretched state all the time during use, so that the transmission part 201 is stretched after a period of use, and a slack condition occurs, and the tightness of the transmission part 201 can be adjusted through the adjusting device 601.

As an embodiment, as shown in fig. 8, the adjusting device includes a slider 602 and a lead screw 603, the slider 602 can move relative to the box 101, the slider 602 is provided with a hole with screw threads, through which the slide 602 can be connected to the lead screw 603, which, by rotation of the rotating lead screw 603, the sliding block 602 can be driven to move relative to the box body 101, the positioning piece 605 is connected on the sliding block 602, the positioning piece 605 can be connected with the transmission part 201, the transmission part 201 can be partially wound on the positioning piece 605, the shape of the transmission part 201 can be changed by changing the position of the positioning piece 605, thereby adjusting the tightness of the transmission part 201, for example, as shown in fig. 8, when the lead screw 603 is rotated, the slider 602 connected thereto is moved upward as shown in fig. 8, so that the transmission portion 201 connected thereto is pulled upward, an arc is added to the power transmission part 201 so that the power transmission part 201 is kept in a tight state.

As another embodiment, as shown in fig. 8, the adjusting device includes a slider 602 and a third driving element 604, the third driving element 604 can drive the slider 602 to move along the inner wall of the box 101, a positioning element 605 is connected to the slider 602, a part of the conductive element can be wound on the positioning element 605, when the transmission part 201 is loose, the third driving element 604 drives the slider 602 to move upward as shown in fig. 8, so as to increase the curvature on the transmission part 201, thereby keeping the transmission part 201 in a tight state.

As another embodiment, as shown in fig. 8, the adjusting device 601 includes a sliding block 602, a third driving element 604, a lead screw 603 and a pushing element 606, the sliding block 602 can slide relative to the box 101, the lead screw 603 can be connected to the pushing element 606, so that the pushing element 606 can be driven to move relative to the box 101 by rotating the lead screw 603, the pushing element 606 can push the sliding block 602 to slide in the box 101 relative to the other end of the lead screw 603, the pushing element 606 is not fixed to the sliding block 602, the third driving element 604 is located at the other end of the sliding block 602 relative to the pushing element 606, and the output end of the third driving element 604 is connected to the sliding block 602 and can drive. The using method of the structure is that firstly, the pushing piece 606 moves relative to the box body 101 through the relative movement of the screw rod 603 and the pushing piece 606, the sliding block 602 moves relative to the box body 101, the transmission part 201 is pulled through the positioning piece 605 on the sliding block 602, the bending is added on the transmission part 201, the transmission part 201 is in a tight state, when the transmission part 201 starts to slightly loosen, the position of the sliding block 602 can be adjusted through the air cylinder, so that the sliding block 602 moves upwards as shown in fig. 8 (at this time, the sliding block 602 is separated from the pushing piece 606), when the transmission part 201 loosens to a larger extent, the pushing piece 606 pushes the sliding block 602 to move upwards as shown in fig. 8 through the movement of the screw rod 603 and the pushing piece 606, so that the output shaft of the third driving piece 604 contracts towards the inside of the shell of the third driving device, and a larger bending is formed on the transmission part 201 (in the process, the pushing piece 606 may press the third driving, the beneficial effect of this structure does: the slight looseness of the transmission part 201 can be finely adjusted by the third driving member 604, and the large looseness of the transmission part 201 can be adjusted by the screw 603 and the slider 602.

As another embodiment, the box 101 may include a plurality of adjusting devices 601, and the adjusting devices 601 may be symmetrical devices or may be configured in other structures as long as the tightness of the transmission portion 201 can be adjusted. As an embodiment, as shown in fig. 8, two adjusting devices 601, a first adjusting device and a second adjusting device are contained in the box 101, the first adjusting device is disposed near the top of the box 101 and located at the connection position of the first end point 302 and the second start point 303, the second adjusting device is disposed near the bottom of the box 101 and located at the bending position of the second ring 306, and the first adjusting device and the second adjusting device are disposed in central symmetry with the center of the transmission path of the transmission portion 201 as the center.

As another embodiment, the box 101 includes a pipe 204, the box 101 is provided with a first port 104, through the first port 104, other heating members can convey heat into the box 101, the pipe 204 can be communicated with the first port 104, so that the heat generated by the heating members can enter the pipe 204, the pipe 204 is further provided with a plurality of air outlets 210, the heat in the pipe 204 can be dispersed into the box 101 through the air outlets 210, and the material 209 is heated, wherein, as shown in fig. 2, the pipe 204 is arranged along the transverse direction of the box 101, and the air outlets 210 on the side wall of the pipe 204 are uniformly distributed, so that the heat in the pipe 204 can be more uniformly distributed into the box 101. It is understood that the duct 204 can be a straight duct 204, or a curved duct 204, and the outlet 210 can be a square or a circle.

As another embodiment, as shown in fig. 3, an air curtain machine 402 is disposed on the top of the second port 103 of the box 101, and the air curtain machine 402 may form an air curtain towards the lower side as shown in the figure, so that the second port 103 may be closed, which not only ensures that the transmission portion 201 and the material 209 can enter and exit the box 101, but also enables the heat inside the box 101 to be better preserved.

As another embodiment, a curtain with adjustable length can be disposed at the upper end of the second opening 103 shown in fig. 3, and the curtain can at least cover the third opening 403, so as to reduce the speed of heat conduction between the box 101 and the outside, and thus the heat in the box 101 can be better retained, meanwhile, since the length of the curtain can be adjusted, even if the size and height of the material 209 change, an operator can adjust the length of the curtain to adapt to the material 209, thereby preventing the curtain from blocking the material 209 from entering and exiting the box 101.

The invention also discloses a production line, as shown in fig. 9, the production line comprises a drying box, an upstream section located at the upstream of the drying box and a downstream section located at the downstream of the drying box, the drying box comprises a first port 104 and a third port 403, hot air generated by a heating device 701 enters the box body 101 through the first port 104 to heat the material 209 in the box body 101, and then flows out of the box body 101 through the third port 403, and the purpose of baking and heating the material 209 can be achieved through the structure. The upper reaches workshop section sets up in one side of drying cabinet, transports the transport mechanism of drying cabinet through the material that the transfer device will pass through upper reaches workshop section processing and accomplish on, send into the drying cabinet by transport mechanism and carry out drying process in, send out the drying cabinet again to the material that will dry by the transfer device is accomplished transports the low reaches workshop section, so that carry out subsequent processing. The assembly line of this embodiment is applicable to the assembly production of speaker, and the speaker at assembly in-process at first bonds through the rubber coating process, then enters into the drying cabinet through transfer device from first mouthful 104 and toasts, and the speaker after toasting enters into subsequent station and carries out subsequent processing.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.