阅读说明：本技术 浮法玻璃生产线用水冷电加热安全闸板 (Water-cooling electric heating safety flashboard for float glass production line ) 是由 舒飞 耿职 叶舒彦 王建 许金明 葛军 郑雯雯 严俊 于 2020-12-02 设计创作，主要内容包括：本发明涉及玻璃生产领域,具体涉及一种浮法玻璃生产线用水冷电加热安全闸板,包括横梁、闸板、闸板驱动机构；所述闸板竖直滑动安装在横梁上,所述闸板驱动机构能够驱动闸板升降；所述闸板边缘处设置有冷却机构,闸板中还设置有加热机构。本发明的优点在于：省时省力,升降较为方便,既可以节省人力物力、降低安全隐患,又可以达到最小风险的快速截断玻璃液,快速升起闸板,使玻璃液流入流液道中。(The invention relates to the field of glass production, in particular to a water-cooling electric heating safety flashboard for a float glass production line, which comprises a beam, a flashboard and a flashboard driving mechanism, wherein the beam is provided with a beam; the gate plate is vertically and slidably mounted on the cross beam, and the gate plate driving mechanism can drive the gate plate to lift; the edge of the flashboard is provided with a cooling mechanism, and the flashboard is also provided with a heating mechanism. The invention has the advantages that: labour saving and time saving, it is comparatively convenient to go up and down, both can use manpower and materials sparingly, reduce the potential safety hazard, can reach the glass liquid of cutting fast of minimum risk again, rises the flashboard fast, makes the glass liquid flow in the liquid flow channel.)

1. The utility model provides a float glass production line is with water-cooling electrical heating safety flashboard which characterized in that: comprises a beam (1), a flashboard (2) and a flashboard driving mechanism (3);

the gate plate (2) is vertically and slidably mounted on the cross beam (1), and the gate plate driving mechanism (3) can drive the gate plate (2) to lift;

the edge of the flashboard (2) is provided with a cooling mechanism (4), and a heating mechanism (5) is further arranged in the flashboard (2).

2. The water-cooled electric heating safety gate for a float glass production line according to claim 1, wherein: the beam (1) is provided with rollers (11) and further comprises transverse rails (6), and the rollers (11) are arranged on the rails (6).

3. The water-cooled electric heating safety gate for a float glass production line according to claim 1, wherein: the cooling mechanism (4) comprises a cooling pipeline (41) arranged at the edge of the flashboard (2), wherein the cooling pipeline (41) extends to the bottom edge of the flashboard (2) along the first side edge of the flashboard (2) and extends to the second side edge of the flashboard (2) from the bottom edge of the flashboard (2);

the inlet of the cooling pipeline (41) is provided with a water inlet pipe (42), the outlet of the cooling pipeline (41) is provided with a water return pipe (43), and the water inlet pipe (42) is connected to a cooling water source arranged outside.

4. The water-cooled electric heating safety gate for a float glass production line according to claim 1, wherein: an accommodating groove (21) is formed in the flashboard (2);

the heating mechanism (5) comprises a resistance wire (51) arranged in the accommodating groove (21) and a temperature control unit, and the resistance wire (51) is connected to the temperature control unit and is controlled by the temperature control unit.

5. The water-cooled electric heating safety gate for a float glass production line according to claim 4, wherein: the opening of the accommodating groove (21) is filled with heat insulation cotton (22), a cover plate (23) is further arranged at the opening, and the heat insulation cotton (22) is located on the inner side of the cover plate (23).

6. The water-cooled electric heating safety gate for a float glass production line according to claim 1, wherein: the flashboard (2) is arranged in a flow liquid channel (71) of the melting furnace (7);

when the flow needs to be stopped, the flashboard driving mechanism (3) drives the flashboard (2) to descend and insert into the liquid inflow channel (71), the heating mechanism (5) does not work, the cooling mechanism (4) works, and the molten glass (72) at the edge of the flashboard (2) is cooled;

when the flashboard (2) needs to be lifted, the cooling mechanism (4) stops working, the heating mechanism (5) works to heat the molten glass (72), and the flashboard driving mechanism (3) drives the flashboard (2) to be lifted from the liquid flow channel (71).

7. The water-cooled electric heating safety gate for a float glass production line according to claim 1, wherein: the gate plate driving mechanism (3) comprises a guide plate (31) arranged on the cross beam (1), and a vertical guide groove (311) along the vertical direction is formed in the guide plate (31);

a hanging rod (24) is arranged on the gate plate (2), a sliding block (25) is arranged at the top end of the hanging rod (24), and the sliding block (25) is slidably arranged in the vertical guide groove (311);

the gate plate driving mechanism (3) further comprises a lever (32) hinged to the cross beam (1), the hinged shaft is arranged along the horizontal direction, a lever guide groove (321) is formed in the first end of the lever (32), the length direction of the lever guide groove (321) is parallel to the lever (32), and the sliding block (25) is arranged in the lever guide groove (321) in a sliding mode.

8. The water-cooled electric heating safety gate for a float glass production line according to claim 7, wherein: the second end of the lever (32) is hinged with a pull rod (33), and a hinge shaft of the pull rod (33) is parallel to a hinge shaft between the lever (32) and the cross beam (1).

9. The water-cooled electric heating safety shutter for a float glass production line according to claim 8, wherein: the beam (1) is provided with a pull rod adjusting arm (35), the pull rod adjusting arm (35) is provided with a pin shaft (36), and the pull rod (33) is provided with a fixing hole matched with the pin shaft (36).

10. The water-cooled electric heating safety gate for a float glass production line according to claim 7, wherein: the second end of the lever (32) is provided with a counterweight (34).

Technical Field

The invention relates to the field of glass production, in particular to a water-cooling electric heating safety flashboard for a float glass production line.

Background

Float glass is known as flat glass because molten glass floats on the surface of molten tin and is formed. The production method can increase the width of the glass plate without overcoming the gravity of the glass, greatly improve the drawing speed, increase the yield and the production scale, and can obtain a high-quality mirror surface with double-sided fire polishing because the forming is carried out on the surface of the molten metal, the surface flatness and the parallelism of the mirror surface can be compared favorably with the mechanical polished glass, and the mechanical performance and the chemical stability of the mirror surface are superior to the mechanical polished glass, so the float glass is popularized soon since birth.

In the glass melting furnace, batch materials gradually generate a series of physical and chemical reactions under the radiation of heat, and after five stages of a silicate forming stage, a glass forming stage, a molten glass clarifying stage, a molten glass homogenizing stage and a molten glass cooling stage, the molten glass has viscosity required by forming. Then the high-quality glass liquid flows into the tin bath through the liquid flow channel, under the action of surface tension and gravity at a certain temperature and under the traction of the transmission roller, the glass belt is flattened, polished, thinned and floated upwards on the tin bath, and when the glass belt is cooled to a certain temperature, the glass belt is lifted by the transition roller table, leaves the tin bath and enters an annealing kiln for annealing.

The safety flashboard is arranged at the position of a flow liquid channel at the outlet of the melting furnace, and when glass is abnormal (production accidents such as broken plates, full grooves and the like) and the glass liquid needs to be cut off, the flashboard can be dropped down through a pull rod operated manually to control the overflow of the glass liquid. Among the prior art, chinese utility model patent as publication No. CN204981594U discloses a movable safety flashboard, and it includes glass solution transition chute body, and it has a pair of carrier tube and movable safety flashboard device in addition, and the bottom of a pair of carrier tube symmetry fixed mounting is subaerial in glass solution transition chute body both sides respectively, and movable safety flashboard device comprises crossbeam frame, flashboard mounting panel, flashboard and adjustable fixed subassembly. After the safety flashboard falls down, most of glass liquid is blocked by the flashboard and cannot flow continuously, but a small amount of glass liquid overflows from a gap between the flashboard and a wall body, and the existing flashboard can only slowly cool by the glass liquid until the glass liquid is solidified and finally stops overflowing; after the abnormal condition is relieved, the safety flashboard needs to be lifted, so that molten glass flows into the tin bath again, at the moment, the molten glass close to the safety flashboard is solidified and adhered to the flashboard, the flashboard is difficult to lift by manpower, if the flashboard is forcibly lifted, the flashboard can be damaged, in order to smoothly lift the flashboard, at present, manufacturers generally use spray guns from two sides to melt the solidified glass again by using the high temperature of open fire, but the glass is heated only on the surface of the glass, the inside of the glass is difficult to melt quickly by heat transfer, so that the existing safety flashboard wastes time and labor when being used for cutting off the molten glass or lifting and discharging the molten glass, and has great potential safety hazards.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the technical problems that in the prior art, a safety flashboard cannot block glass flow quickly and is inconvenient to lift are solved.

The invention solves the technical problems through the following technical means: a water-cooling electric heating safety flashboard for a float glass production line comprises a beam, a flashboard and a flashboard driving mechanism;

the gate plate is vertically and slidably mounted on the cross beam, and the gate plate driving mechanism can drive the gate plate to lift;

the edge of the flashboard is provided with a cooling mechanism, and the flashboard is also provided with a heating mechanism.

When the water-cooling electric heating safety flashboard for the float glass production line is practically applied, the flashboard is arranged in a flow channel of a melting furnace, when the cutoff is needed, the flashboard is driven by the flashboard driving mechanism to descend and be inserted into the flow channel, the cooling mechanism is started to work, the cooling mechanism rapidly cools glass liquid at the edge of the flashboard, further the glass liquid between the edge of the flashboard and the inner wall of the flow channel is prevented from overflowing, the glass flow can be quickly blocked, when the flashboard needs to be lifted, the cooling mechanism is closed, the heating mechanism is opened, the glass liquid near the flashboard is heated by the heating mechanism, the glass liquid is rapidly melted, further the flashboard is not stuck, the flashboard is driven by the flashboard driving mechanism to lift from the flow channel, the flashboard can smoothly lift, the time and the labor are saved, the lifting is more convenient, the manpower and material resources can be saved, the potential safety, and rapidly lifting the flashboard to enable the glass liquid to flow into the liquid flow channel, wherein the process is controllable, and the heating temperature can be controlled according to actual needs.

Preferably, the cross beam is provided with a roller and further comprises a transverse rail, and the roller is arranged on the rail.

Preferably, the cooling mechanism comprises a cooling pipeline arranged at the edge of the gate plate, and the cooling pipeline extends to the bottom edge of the gate plate along the first side edge of the gate plate and extends to the second side edge of the gate plate from the bottom edge of the gate plate;

the inlet of the cooling pipeline is provided with a water inlet pipe, the outlet of the cooling pipeline is provided with a water return pipe, and the water inlet pipe is connected to a cooling water source of the peripheral equipment.

Optimally, an accommodating groove is formed in the flashboard;

the heating mechanism comprises a resistance wire arranged in the accommodating groove and a temperature control unit, and the resistance wire is connected to the temperature control unit and is controlled by the temperature control unit.

Optimized, the holding tank opening part is filled with thermal-insulated cotton, and the opening part still sets up the apron, and thermal-insulated cotton is located the apron inboard.

Optimally, the flashboard is arranged in a fluid passage of the melting furnace;

when the flow needs to be stopped, the flashboard driving mechanism drives the flashboard to descend and insert into the liquid inlet channel, the heating mechanism does not work, the cooling mechanism works, and the molten glass at the edge of the flashboard is cooled;

when the flashboard needs to be lifted, the cooling mechanism stops working, the heating mechanism works to heat the molten glass, and the flashboard driving mechanism drives the flashboard to lift from the liquid flow channel.

Preferably, the gate plate driving mechanism comprises a guide plate arranged on the cross beam, and a vertical guide groove along the vertical direction is formed in the guide plate;

a hanging rod is arranged on the flashboard, a sliding block is arranged at the top end of the hanging rod, and the sliding block is slidably arranged in the vertical guide groove;

the flashboard driving mechanism further comprises a lever hinged to the cross beam, the hinged shaft is arranged along the horizontal direction, a lever guide groove is formed in the first end of the lever, the length direction of the lever guide groove is parallel to the lever, and the sliding block is arranged in the lever guide groove in a sliding mode.

When the flashboard is required to fall down, the second end of the lever is lifted, the sliding block descends along the vertical direction under the guide of the vertical guide groove, the sliding block slides in the lever guide groove, the flashboard descends, when the flashboard is required to be lifted, the second end of the lever is pulled down, the sliding block ascends along the vertical direction under the guide of the vertical guide groove, the sliding block slides in the lever guide groove, the flashboard ascends, the flashboard is controlled to ascend and descend by utilizing the lever, the structure and the principle are simple, and the operation is convenient and the ascending and descending are reliable.

Preferably, the second end of the lever is hinged with a pull rod, and a hinge shaft of the pull rod is parallel to a hinge shaft between the lever and the cross beam.

Preferably, a pull rod adjusting arm is arranged on the cross beam, a pin shaft is arranged on the pull rod adjusting arm, and a fixing hole matched with the pin shaft is formed in the pull rod.

After the flashboard is lifted or dropped, the fixing hole of the pull rod can be matched with the pin shaft to fix the pull rod, so that the flashboard is limited at a specific position.

Preferably, the second end of the lever is provided with a counterweight.

The invention has the advantages that:

1. when the water-cooling electric heating safety flashboard for the float glass production line is practically applied, the flashboard is arranged in a flow channel of a melting furnace, when the cutoff is needed, the flashboard is driven by the flashboard driving mechanism to descend and be inserted into the flow channel, the cooling mechanism is started to work, the cooling mechanism rapidly cools glass liquid at the edge of the flashboard, further the glass liquid between the edge of the flashboard and the inner wall of the flow channel is prevented from overflowing, the glass flow can be quickly blocked, when the flashboard needs to be lifted, the cooling mechanism is closed, the heating mechanism is opened, the glass liquid near the flashboard is heated by the heating mechanism, the glass liquid is rapidly melted, further the flashboard is not stuck, the flashboard is driven by the flashboard driving mechanism to lift from the flow channel, the flashboard can smoothly lift, the time and the labor are saved, the lifting is more convenient, the manpower and material resources can be saved, the potential safety, and rapidly lifting the flashboard to enable the glass liquid to flow into the liquid flow channel, wherein the process is controllable, and the heating temperature can be controlled according to actual needs.

2. When the flashboard is required to fall down, the second end of the lever is lifted, the sliding block descends along the vertical direction under the guide of the vertical guide groove, the sliding block slides in the lever guide groove, the flashboard descends, when the flashboard is required to be lifted, the second end of the lever is pulled down, the sliding block ascends along the vertical direction under the guide of the vertical guide groove, the sliding block slides in the lever guide groove, the flashboard ascends, the flashboard is controlled to ascend and descend by utilizing the lever, the structure and the principle are simple, and the operation is convenient and the ascending and descending are reliable.

3. After the flashboard is lifted or dropped, the fixing hole of the pull rod can be matched with the pin shaft to fix the pull rod, so that the flashboard is limited at a specific position.

Drawings

FIG. 1 is a schematic view of a water-cooled electrically heated safety shutter for a float glass production line according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the distribution of resistance wires in the embodiment of the present invention;

FIG. 3 is a control schematic diagram of the resistance wire in the embodiment of the present invention;

FIG. 4 is a schematic diagram of the distribution of cooling ducts in an embodiment of the present invention;

FIG. 5 is a schematic view showing the use of the shutter according to the embodiment of the present invention;

FIG. 6 is a schematic view of the installation of the slider in the embodiment of the present invention;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;

wherein the content of the first and second substances,

a beam-1, rollers-11 and a routing pipe-12;

the device comprises a flashboard-2, a containing groove-21, heat insulation cotton-22, a cover plate-23, a suspender-24, a slider-25 and a lifting lug-26;

the gate plate driving mechanism-3, the guide plate-31, the lever-32, the pull rod-33, the balancing weight-34, the pull rod adjusting arm-35, the pin shaft-36, the vertical guide groove-311 and the lever guide groove-321;

a cooling mechanism-4, a cooling pipeline-41, a water inlet pipe-42 and a water return pipe-43;

a heating mechanism-5, a resistance wire-51 and a heat-resistant cable-52;

track-6;

a melting furnace-7, a flow channel-71 and molten glass-72.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figure 1, the water-cooling electric heating safety gate for the float glass production line comprises a beam 1, a gate 2, a gate driving mechanism 3, a cooling mechanism 4, a heating mechanism 5 and a track 6.

For ease of understanding and description, the perspective of FIG. 1 is taken as the perspective of the front view, and the rest of the orientations are analogized, it being understood that this orientation is set forth only for ease of description and understanding, and is not to be construed as limiting the invention.

In this embodiment, as shown in fig. 1, the main function of the beam 1 is to provide a mounting position for other components, which is not limited to a specific shape, in this embodiment, the beam 1 is T-shaped, the roller 11 is disposed on the beam 1, the roller 11 is disposed on the rail 6, the roller 11 is disposed on the top of the beam 1, and the beam 1 is hung on the rail 6 through the roller 11, so as to conveniently move the whole safety shutter.

Further, a brake mechanism may be provided on the cross member 1 so as to lock the roller 11, which is a conventional art, to position the entire safety shutter at a specific position of the rail 6.

As shown in fig. 1, the shutter 2 is vertically slidably mounted on the cross beam 1, and the shutter driving mechanism 3 can drive the shutter 2 to ascend and descend.

Specifically, as shown in fig. 1, the shutter driving mechanism 3 includes a guide plate 31 disposed on the cross beam 1, and a vertical guide slot 311 is disposed on the guide plate 31 along the vertical direction; the guide plate 31 is in the shape of a vertical plate, and the guide plate 31 is installed at the left end of the cross beam 1 by welding or bolt connection.

As shown in fig. 1, a boom 24 is arranged on the gate plate 2, specifically, a triangular lifting lug 26 is arranged at the top of the gate plate 2, the lower end of the boom 24 is mounted in the middle of the lifting lug 26, specifically, the lower end of the boom 24 is hinged on the lifting lug 26, and the hinge axis is along the front-back direction. Alternatively, the lower end of the boom 24 is fixed to the lifting lug 26 by bolting or welding.

As shown in fig. 1, a slide block 25 is arranged at the top end of the suspension rod 24, and the slide block 25 is slidably installed in the vertical guide slot 311; as shown in fig. 6 and 7, the slider 25 is generally cylindrical, the axis of the slider 25 is along the front-back direction, the diameter of the cylindrical portion of the slider 25 is greater than the width of the vertical guide slot 311, the width of the portion of the slider 25 matched with the vertical guide slot 311 is equivalent to the width of the vertical guide slot 311, the two are in sliding fit, and the slider 25 is further provided with a ring groove. The top end of the suspension rod 24 is mounted on the sliding block 25 by welding or bolt connection.

As shown in fig. 1, the shutter drive mechanism 3 further includes a lever 32 hinged to the cross member 1, the hinge axis being in the horizontal direction, specifically, the lever 32 is hinged below the middle of the cross member 1.

As shown in fig. 1, the first end of the lever 32 is provided with a lever guide groove 321, the length direction of the lever guide groove 321 is parallel to the lever 32, the lever guide groove 321 opens to the left, and the slider 25 is slidably disposed in the lever guide groove 321. Specifically, as shown in fig. 7, the first end of the lever 32 is inserted into the annular groove of the slider 25, i.e., the cylinder formed on the bottom surface of the annular groove is slidably mounted in the lever guide groove 321.

As shown in fig. 1, the second end of the lever 32 is hinged with a pull rod 33, and the hinge axis of the pull rod 33 is parallel to the hinge axis between the lever 32 and the beam 1. The lower end of the pull rod 33 is provided with a transverse handle 331 for facilitating pushing and pulling.

As shown in fig. 1, a pull rod adjusting arm 35 is arranged on a cross beam 1, the pull rod adjusting arm 35 is a vertical plate-shaped structure and is installed at the right end of the cross beam 1 in a bolt connection or welding manner, a pin shaft 36 is arranged on the pull rod adjusting arm 35, the pin shaft 36 is arranged at the lower end of the pull rod adjusting arm 35, the pin shaft 36 is arranged along the left and right directions, a fixing hole matched with the pin shaft 36 is arranged on the pull rod 33, the fixing hole is communicated along the left and right directions and can be a round hole or a long hole along the vertical direction, a plurality of fixing holes can be arranged along the length direction of the pull rod 33 according to actual requirements, two fixing holes are arranged in the embodiment, one above the other, when the pin shaft 36 is inserted into the fixing hole above, the shutter 2 is in a raised position, and when the pin shaft 36 is inserted into.

As shown in fig. 1, the second end of the lever 32 is provided with a weight 34. The edge of the flashboard 2 is provided with a cooling mechanism 4, and the flashboard 2 is also provided with a heating mechanism 5.

As shown in fig. 4, the cooling mechanism 4 includes a cooling duct 41 provided at an edge of the shutter 2, the cooling duct 41 extending along a first side edge of the shutter 2 to a bottom edge of the shutter 2 and extending from the bottom edge of the shutter 2 to a second side edge of the shutter 2; a water inlet pipe 42 is arranged at the inlet of the cooling pipeline 41, a water return pipe 43 is arranged at the outlet of the cooling pipeline 41, and the water inlet pipe 42 is connected to an external cooling water source.

As shown in fig. 2, an accommodating groove 21 is provided on the shutter 2; the heating mechanism 5 comprises a resistance wire 51 arranged in the accommodating groove 21 and further comprises a temperature control unit, and the resistance wire 51 is connected to and controlled by the temperature control unit. The temperature control unit can be realized by adopting a PLC in the prior art.

As shown in fig. 2, the opening of the accommodating groove 21 is filled with thermal insulation cotton 22, a cover plate 23 is further disposed at the opening, and the thermal insulation cotton 22 is located inside the cover plate 23.

As shown in fig. 2, the accommodating grooves 21 are three, one of the accommodating grooves is located in the middle of the shutter 2, the other two accommodating grooves are symmetrically distributed on two sides of the middle accommodating groove 21, and each accommodating groove 21 is separately provided with a resistance wire 51.

As shown in fig. 3, in this embodiment, the temperature control unit 3 includes a temperature transmitter, a regulator and a power regulator, the temperature of the 3 resistance wires 51 is T1, T2 and T3, respectively, where T2 is a middle temperature, and after passing through the transmitter, the output of the temperature control unit is connected in series to an outer given loop of the two regulators, that is, the two temperatures are regulated along with the middle temperature, so as to achieve the purpose of rapidly heating the shutter.

As shown in fig. 1, the beam 1 is further provided with a wiring pipe 12, the wiring pipe 12 is transversely placed on the beam 1 and extends downwards from the left end of the beam 1 to the shutter 2, the resistance wire 51 is connected with the heat-resistant cable 52, and the heat-resistant cable 52 is led out to the outside through the wiring pipe 12.

As shown in fig. 5, the shutter 2 is installed in a flow path 71 of the melting furnace 7; when the closure is needed, the flashboard driving mechanism 3 drives the flashboard 2 to descend and insert into the liquid inflow channel 71, the heating mechanism 5 does not work, the cooling mechanism 4 works, and the molten glass 72 at the edge of the flashboard 2 is cooled; when the shutter 2 needs to be lifted, the cooling mechanism 4 stops operating, the heating mechanism 5 operates to heat the molten glass 72, and the shutter driving mechanism 3 drives the shutter 2 to be lifted from the flow channel 71.

The working principle is as follows:

as shown in figures 1 and 5, when the water-cooling electric heating safety gate for a float glass production line is practically used, the gate is installed in a flow channel 71 of a melting furnace 7, when the flow needs to be stopped, a gate 2 is driven by a gate driving mechanism 3 to descend and be inserted into the flow channel 71, a cooling mechanism 4 is started to work, the cooling mechanism 4 rapidly cools glass liquid 72 at the edge of the gate 2, the glass liquid 72 between the edge of the gate 2 and the inner wall of the flow channel 71 is prevented from overflowing, the glass flow can be blocked rapidly, when the gate 2 needs to be lifted, the cooling mechanism 4 is closed, a heating mechanism 5 is started, the heating mechanism 5 heats the glass liquid 72 near the gate 2, the glass liquid 72 is rapidly melted, the gate 2 cannot be stuck, the gate 2 is driven by the gate driving mechanism 3 to lift the gate 2 from the flow channel 71, the gate 2 can be lifted smoothly, time and labor are saved, the lifting is convenient, the glass liquid 72 can be cut off quickly and the flashboard 2 can be lifted quickly, so that the glass liquid 72 flows into the liquid flow channel 71, the process is controllable, and the heating temperature can be controlled according to actual needs.

When the flashboard 2 needs to fall down, the second end of the lever 32 is lifted, the sliding block 25 descends along the vertical direction under the guide of the vertical guide groove 311, meanwhile, the sliding block 25 slides in the lever guide groove 321, the flashboard 2 descends, when the flashboard 2 needs to be lifted, the second end of the lever 32 is pulled down, the sliding block 25 ascends along the vertical direction under the guide of the vertical guide groove 311, meanwhile, the sliding block 25 slides in the lever guide groove 321, the flashboard 2 ascends, and the lever is used for controlling the flashboard 2 to ascend and descend.

After the shutter 2 is lifted or lowered, the fixing hole of the pull rod 33 may be engaged with the pin 36 to fix the pull rod 33, thereby restraining the shutter 2 at a specific position.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.