UV dryer used in the preparation process of thermal transfer film

Abstract

The utility model discloses a UV dryer used in the preparation process of a thermal transfer film, comprising a workbench, a mounting cover is slidably arranged on the workbench, an irradiation lamp is arranged in the mounting cover, a driving mechanism for driving the mounting cover to move is arranged on the workbench, two mounting plates arranged symmetrically are arranged on the top of the workbench, a second groove is opened on both mounting plates, a second screw is rotatably arranged in the second groove, a slide plate is threadedly connected on the second screw, the slide plate is slidably connected with the second groove, a first bevel gear is fixedly provided on the second screw, a second bevel gear is rotatably provided in the second groove, and the second bevel gear is meshed with the first bevel gear; a rack is fixedly provided on the bottom of the mounting cover, a rotating shaft is rotatably provided between the two second grooves, the rotating shaft drives the second bevel gear to rotate, a gear is fixedly provided on the rotating shaft, and the gear meshes with the rack when in contact, so as to prevent the thermal transfer film from moving and affecting the drying effect of the UV dryer on the thermal transfer film.

Description

Technical Field

[0001] The utility model relates to the technical field of UV dryers, in particular to a UV dryer used in the preparation process of a thermal transfer film. Background Art

[0002] UV dryer is a high-tech that uses strong ultraviolet radiation to perform instant surface curing. It has been rapidly developed in recent years. Its unique radiation characteristics and good performance have attracted great attention from the scientific and technological circles and the business community. It is used for offset printing of various non-permeable substrates, and has strong adhesion to instant drying. Print UV ink on the thermal transfer film, and then use the UV dryer to cure and dry the UV ink. UV dryers are widely used in large-scale printing industries such as cigarette label packaging printing, color printing packaging printing, etc.

[0003] A UV dryer is disclosed in a Chinese patent document with publication number CN218489316U, including a base, a mounting cover is fixedly installed on the left side of the top of the base, a mounting cylinder is connected to the left side of the mounting cover, a mounting plate is arranged on the top of the base and on the right side of the mounting cover, two mounting rods are arranged on the top of the mounting plate, two pull rods are arranged on the top of the mounting rod, evenly distributed mounting seats are fixedly installed on the top of the inner cavity of the mounting cover, and an irradiation lamp is fixedly installed on the bottom of the mounting seat. The carton is placed by the cooperation between the pull rod, the mounting rod and the mounting plate, and the carton is squeezed and fixed by mutual adjustment between the two mounting plates.

[0004] The disadvantage of the above disclosed solution is that when the UV ink on the thermal transfer film is cured and dried, the mutual adjustment between the two mounting plates cannot fix the thermal transfer film from top to bottom, which makes the thermal transfer film easy to move, thereby affecting the drying effect of the UV dryer on the thermal transfer film. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a UV dryer used in the preparation process of thermal transfer films.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a UV dryer used in the preparation process of a thermal transfer film, comprising a workbench, the bottom of the workbench is evenly fixed with support columns, a mounting cover is slidably arranged on the workbench, an irradiation lamp is arranged on the top of the mounting cover, a driving mechanism for driving the mounting cover to move is arranged on the workbench, a rack is fixedly arranged on the bottom of the mounting cover, two symmetrically arranged mounting plates are arranged on the top of the workbench, the bottoms of the two mounting plates extend to the bottom of the workbench, a second groove is vertically opened on the opposite side of the two mounting plates, a second screw rod is vertically rotatably arranged in the second groove, a slide plate is threadedly connected to the second screw rod, the slide plate is located above the workbench and is slidably connected with the second groove, a first bevel gear is fixedly provided on the bottom of the second screw rod, a second bevel gear is rotatably provided in the second groove, and the second bevel gear is meshed with the first bevel gear; a rotating shaft is rotatably arranged between the opposite sides of the two second grooves, one end of the rotating shaft passes through the mounting plate and the fixed sleeve is provided with a gear, the gear meshes with the rack when in contact, a limiting assembly is arranged between the second bevel gear and the rotating shaft, and the rotating shaft drives the second bevel gear to rotate through the limiting assembly.

[0007] Furthermore, a pressure plate is provided under the skateboard, and a sliding rod is fixedly and symmetrically provided on the top of the pressure plate. The top of the sliding rod passes through the skateboard upward and is slidably connected to the skateboard. A second spring is sleeved on the sliding rod, one end of the second spring is fixedly connected to the skateboard, and the other end of the second spring is fixedly connected to the pressure plate.

[0008] Furthermore, the driving mechanism includes a motor, which is fixedly arranged at the bottom of the workbench. A first screw is fixedly arranged at the output end of the motor. The first screw passes through the bottom of the mounting cover and is threadedly connected to the mounting cover. A fixed block is fixedly arranged at the bottom of the workbench, and an end of the first screw away from the motor is rotatably connected to the fixed block.

[0009] Furthermore, the limiting assembly includes a guide groove and a guide block, the guide groove is opened on the rotating shaft along the length direction of the rotating shaft, the second bevel gear is sleeved on the rotating shaft, the guide block is fixedly arranged on the inner wall of the second bevel gear, and the guide block is slidably connected to the guide groove.

[0010] Furthermore, a placement plate is placed on the top of the workbench, and the placement plate is located between the two mounting plates. A cylinder is fixedly arranged at the bottom of the workbench, and a cylinder rod is sealingly and slidingly arranged in the cylinder. A first fixing plate is fixedly arranged at the bottom of the mounting cover, and the cylinder rod slides through the first fixing plate. A circular plate is fixedly sleeved on the cylinder rod, and a first spring is fixedly arranged between the circular plate and the first fixing plate; two symmetrically arranged piston cylinders are fixedly arranged on the top of the workbench, and the piston rods of the two piston cylinders are fixedly connected to the corresponding mounting plates, and the two piston cylinders are connected to the inside of the cylinder through pipes. A first groove is opened on the workbench, and the bottoms of the two mounting plates are slidably connected to the first groove.

[0011] Furthermore, the top wall in the mounting cover is slidingly provided with a first movable plate and a second movable plate which are symmetrically arranged, and the bottoms of the first movable plate and the second movable plate are both slidingly and snap-connected with limit plates, the limit plates correspond to the mounting plates one by one, and the bottom ends of the limit plates are fixedly connected to the mounting plates, and a fourth groove is provided on the first movable plate along its length direction, and the irradiation lamp is located between the first movable plate and the second movable plate and is arranged at an angle, one end of the irradiation lamp is slidably connected to the fourth groove, and the other end of the irradiation lamp is hingedly connected to the second movable plate.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. A rack is fixedly provided at the bottom of the mounting cover, and the rack meshes with the gear when in contact. When the mounting cover moves, the rack is driven to move, and when the rack contacts the gear, it meshes with the gear. At the same time, the mounting cover continues to move, so that the rack drives the gear to rotate, the gear drives the rotating shaft to rotate, the rotating shaft drives the second bevel gear to rotate, the second bevel gear drives the first bevel gear to rotate, the first bevel gear drives the second screw to rotate, the second screw drives the slide plate to move downward along the second groove, and the slide plate drives the pressure plate to move downward through the second spring. The pressure plate is pressed on the edge of the thermal transfer film, and the slide plate compresses the second spring, and the second spring clamps the edge of the thermal transfer film to prevent the thermal transfer film from moving and affecting the drying effect of the UV dryer on the thermal transfer film.

[0014] 2. Since the top wall of the installation cover is slidably provided with a symmetrically arranged first movable plate and a second movable plate, the irradiation lamp is located between the first movable plate and the second movable plate and is arranged obliquely. Therefore, when the two installation plates move toward each other, the first movable plate and the second movable plate are driven to move toward each other through the corresponding limit plates, and the first movable plate and the second movable plate move toward each other so that one end of the irradiation lamp moves in the fourth groove, so that the irradiation range of the irradiation lamp is adapted to the width of the placement plate, reducing the loss of the irradiation lamp light source energy, thereby improving the drying efficiency of the irradiation lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the first embodiment of the structure of the utility model;

[0016] Figure 2 This is an enlarged schematic diagram of point A of the first structural embodiment of the utility model;

[0017] Figure 3 It is a partial cross-sectional schematic diagram of the first structural embodiment of the utility model;

[0018] Figure 4 It is a three-dimensional schematic diagram of the second structural embodiment of the utility model;

[0019] Figure 5 This is a schematic diagram of the first movable plate and the second movable plate of the second structural embodiment of the utility model.

[0020] In the figure: 1, rotating shaft; 2, gear; 3, supporting column; 4, motor; 5, workbench; 6, first screw rod; 7, irradiation lamp; 8, mounting plate; 9, fixing block; 10, slide plate; 11, slide rod; 12, cylinder; 13, first fixing plate; 14, first spring; 15, piston cylinder; 16, placing plate; 17, round plate; 18, first groove; 19, second spring; 20, second screw rod; 21, pressure plate; 22, second groove; 23, first bevel gear; 24, second bevel gear; 25, second fixing plate; 26, mounting cover; 27, first movable plate; 28, limit plate; 29, third groove; 30, second movable plate; 31, rack; 32, fourth groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] See also Figure 1-Figure 3 This embodiment provides a technical solution: a UV dryer used in the preparation process of a thermal transfer film, including a workbench 5, and support columns 3 are fixedly installed at the four corners of the bottom of the workbench 5 to support the workbench 5. A mounting cover 26 is slidably installed on the workbench 5, and the mounting cover 26 is an inverted "U" shape. The mounting cover 26 has a slide groove on the opposite side of the bottom, and the slide groove is slidably installed with the edge of the workbench 5. Two irradiation lamps 7 are installed on the top of the mounting cover 26, and the irradiation lamps 7 irradiate the UV ink on the thermal transfer film, and cure and dry the UV ink under the action of ultraviolet rays. A driving mechanism for driving the mounting cover 26 to move is installed on the workbench 5.

[0024] The driving mechanism includes a motor 4, which is fixedly mounted at the bottom of the workbench 5. A first screw rod 6 is fixedly mounted at the output end of the motor 4. The first screw rod 6 passes through the bottom of the mounting cover 26 and is threadedly connected to the mounting cover 26. A fixing block 9 is fixedly mounted at the bottom of the workbench 5. One end of the first screw rod 6 away from the motor 4 is rotatably mounted with the fixing block 9. The fixing block 9 plays a role in stabilizing the rotation of the first screw rod 6.

[0025] The workbench 5 is provided with a first groove 18, which is a through groove. Two symmetrically arranged mounting plates 8 are mounted on the top of the workbench 5, and the bottoms of the two mounting plates 8 are both slidably mounted with the first groove 18, and the bottoms of the two mounting plates 8 extend to the bottom of the workbench 5.

[0026] A second groove 22 is vertically formed on one side opposite to the two mounting plates 8, and the second groove 22 vertically passes through the first groove 18. A protrusion is fixedly installed in the second groove 22, and the protrusion is flush with the workbench 5. A second screw rod 20 is vertically rotatably installed in the second groove 22, and the second screw rod 20 passes through the protrusion and is rotatably installed with the protrusion, and the protrusion plays a role in stabilizing the rotation of the second screw rod 20.

[0027] A first bevel gear 23 is fixedly sleeved on the bottom end of the second screw rod 20 , a sleeve is rotatably mounted on the inner wall of the second groove 22 , a second bevel gear 24 is fixedly mounted on one end of the sleeve, and the second bevel gear 24 is meshedly connected with the first bevel gear 23 .

[0028] A rotating shaft 1 is rotatably mounted between the two opposite sides of the second grooves 22, one end of the rotating shaft 1 passes through the corresponding mounting plate 8 and is fixedly sleeved with a gear 2. A second fixing plate 25 is fixedly mounted at the bottom of the workbench 5, and the other end of the rotating shaft 1 passes through the sleeve and the corresponding mounting plate 8 in sequence and is rotatably mounted with the second fixing plate 25. A rack 31 is fixedly mounted at the bottom of the mounting cover 26, and the rack 31 meshes with the gear 2 when in contact. A limit assembly is installed between the rotating shaft 1 and the second bevel gear 24, and the rotating shaft 1 drives the second bevel gear 24 to rotate through the limit assembly.

[0029] The limiting assembly includes a guide groove and a guide block. The guide groove is provided on the outer surface of the rotating shaft 1 along the length direction of the rotating shaft 1. The rotating shaft 1 passes through the center of the second bevel gear 24, and the guide block is fixedly installed on the inner wall of the second bevel gear 24. The guide block is installed in a sliding manner in the guide groove. The cooperation between the guide block and the guide groove can not only enable the rotating shaft 1 to drive the second bevel gear 24 to rotate, but also enable the second bevel gear 24 to slide along the rotating shaft 1.

[0030] The outer surface of the second screw rod 20 is threadedly connected with the slide plate 10, and the slide plate 10 is located above the workbench 5 and is slidably mounted with the second groove 22. A pressing plate 21 is installed below the slide plate 10, and a slide bar 11 is fixedly and symmetrically mounted on the top of the pressing plate 21. The top end of the slide bar 11 passes through the slide plate 10 upward and is slidably mounted with the slide plate 10. A second spring 19 is sleeved on the outer surface of the slide bar 11, and the top end of the second spring 19 is fixedly mounted with the slide plate 10, and the bottom end of the second spring 19 is fixedly mounted with the pressing plate 21. The second spring 19 plays a role in buffering and protecting the thermal transfer film, preventing the pressing plate 21 from exerting too much pressure on the thermal transfer film, thereby causing damage to the thermal transfer film.

[0031] A placement plate 16 is placed on the upper surface of the workbench 5, and the placement plate 16 is located between the two mounting plates 8. A cylinder 12 is fixedly installed at the bottom of the workbench 5, and a cylinder rod is sealed and slidably installed in the cylinder 12. A first fixing plate 13 is fixedly installed at the bottom of the mounting cover 26, and the cylinder rod slides through the first fixing plate 13, and a circular plate 17 is fixedly sleeved on one end of the cylinder rod, and a first spring 14 is fixedly installed between the circular plate 17 and the first fixing plate 13. The first spring 14 plays a buffering role.

[0032] Two symmetrically arranged piston cylinders 15 are fixedly mounted on the upper surface of the workbench 5, and the two piston cylinders 15 are connected to the inside of the cylinder 12 through a hose. And the piston rods of the two piston cylinders 15 are fixedly mounted with the corresponding mounting plates 8.

[0033] The working principle of the UV dryer used in the preparation process of the thermal transfer film provided in this embodiment is as follows:

[0034] Place the placement plate 16 on the upper surface of the workbench 5, and make the placement plate 16 between the two mounting plates 8. Place the thermal transfer film to be dried on the upper surface of the placement plate 16, and the thermal transfer film is adapted to the length and width of the placement plate 16. Start the motor 4, the motor 4 drives the first screw 6 to rotate, the first screw 6 drives the mounting cover 26 to move, the mounting cover 26 drives the first fixing plate 13 to move, the first fixing plate 13 drives the first spring 14 to move, the first spring 14 drives the circular plate 17 to move along the axis direction of the cylinder 12, the circular plate 17 drives the cylinder rod of the cylinder 12 to contract, the cylinder rod of the cylinder 12 contracts and causes the gas in the cylinder 12 to enter the piston cylinder 15 through the hose, the gas enters the piston cylinder 15 and pushes the piston rod to extend, the piston cylinder 15 extends and drives the two mounting plates 8 to move toward each other along the first groove 18, the two mounting plates 8 move toward each other to clamp and position the placement plate 16, and avoid the placement plate 16 from tilting when placed on the upper surface of the workbench 5, and the thermal transfer film has a part that exceeds the irradiation lamp 7.

[0035] When the mounting cover 26 moves, it also drives the rack 31 to move. When the rack 31 contacts the gear 2, it meshes with the gear 2. At the same time, the mounting cover 26 continues to move, so that the rack 31 drives the gear 2 to rotate, the gear 2 drives the rotating shaft 1 to rotate, the rotating shaft 1 drives the second bevel gear 24 to rotate, the second bevel gear 24 drives the first bevel gear 23 to rotate, the first bevel gear 23 drives the second screw rod 20 to rotate, the rotation of the second screw rod 20 drives the slide plate 10 to move downward along the second groove 22, and the slide plate 10 drives the pressure plate 21 to move downward through the second spring 29.

[0036] When the mounting cover 26 drives the irradiation lamp 7 to move toward the placement plate 16, the two mounting plates 8 first clamp the placement plate 16. Then, when the mounting cover 26 drives the irradiation lamp 7 to move to the top of the placement plate 16, the first spring 14 is stretched, and the pressing plate 21 just presses on the edge of the thermal transfer film, and the slide plate 10 compresses the second spring 19, and the second spring 19 makes the pressing plate 21 clamp the edge of the thermal transfer film to prevent the thermal transfer film from moving, thereby affecting the drying effect of the UV dryer on the thermal transfer film.

[0037] At this time, the irradiation lamp 7 is started to irradiate the thermal transfer film. Under the irradiation of the ultraviolet rays emitted by the irradiation lamp 7, the photopolymerization initiator in the UV ink of the thermal transfer film absorbs photons of a certain wavelength and turns into free molecules, becoming free radicals. Then, through the transfer of intermolecular energy, the polymerizable prepolymer and the photosensitive monomer are turned into an excited state, generating a charge transfer complex, which is continuously cross-linked and polymerized to solidify into a film.

[0038] Embodiment 2

[0039] See also Figure 4-Figure 5 This embodiment provides a technical solution based on the first embodiment:

[0040] The top wall in the mounting cover 26 is slidably mounted with a symmetrically arranged first moving plate 27 and a second moving plate 30. The top wall in the mounting groove 26 is provided with two symmetrically arranged third grooves 29, and the cross section of the third grooves 29 is "T" shaped. T-shaped blocks are symmetrically fixedly mounted on the top of the first moving plate 27 and the second moving plate 30, and the T-shaped blocks are slidably mounted in cooperation with the corresponding third grooves 29.

[0041] The bottom of the first movable plate 27 and the second movable plate 30 are both slidably mounted with a limit plate 28. The limit plate 28 corresponds to the mounting plate 8 one by one, and the top of the limit plate 28 is "U" shaped. The bottoms of the first movable plate 27 and the second movable plate 30 are respectively mounted on the top of the corresponding limit plate 28, and the bottoms of the first movable plate 27 and the second movable plate 30 are respectively mounted with the top of the corresponding limit plate 28 in a sliding manner. The bottom end of the limit plate 28 is fixedly mounted with the top of the mounting plate 8. A fourth groove 32 is provided on one side of the first movable plate 27 along its length direction.

[0042] The irradiation lamp 7 is located between the first movable plate 27 and the second movable plate 30 and is arranged at an angle. One end of the irradiation lamp 7 is located in the fourth groove 32 and is slidably installed with the fourth groove 32, and the other end of the irradiation lamp 7 is hingedly installed with the second movable plate 30.

[0043] The working principle of the UV dryer used in the preparation process of the thermal transfer film provided in this embodiment is as follows:

[0044] When the two mounting plates 8 move toward each other, since the bottoms of the first movable plate 27 and the second movable plate 30 are both slidably engaged with the tops of the corresponding limit plates 28, the two mounting plates 8 can respectively drive the first movable plate 27 and the second movable plate 30 to move toward each other through the corresponding limit plates 28, and at the same time, it does not hinder the mounting cover 26 from driving the first movable plate 27 and the second movable plate 30 to slide along the tops of the corresponding limit plates 28.

[0045] The first movable plate 27 and the second movable plate 30 move toward each other to move one end of the irradiation lamp 7 in the fourth groove 32, so that the irradiation range of the irradiation lamp 7 is adapted to the width of the placement plate 16, reducing the loss of light source energy of the irradiation lamp 7 and thereby improving the drying efficiency of the irradiation lamp 7.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A UV dryer for use in the preparation of a thermal transfer film, comprising a workbench (5), characterized in that: The bottom of the workbench (5) is evenly and fixedly provided with support columns (3); a mounting cover (26) is slidably provided on the workbench (5); a lighting lamp (7) is provided at the top of the mounting cover (26); a driving mechanism for driving the mounting cover (26) to move is provided on the workbench (5); a rack (31) is fixedly provided at the bottom of the mounting cover (26); two symmetrically arranged mounting plates (8) are provided at the top of the workbench (5); the bottoms of the two mounting plates (8) extend to the bottom of the workbench (5); second grooves (22) are vertically provided on opposite sides of the two mounting plates (8); a second screw rod (20) is vertically and rotatably provided in the second groove (22); a slide plate is threadedly connected to the second screw rod (20) (10), the slide plate (10) is located above the workbench (5) and is slidably connected to the second groove (22), the bottom fixed sleeve of the second screw rod (20) is provided with a first bevel gear (23), a second bevel gear (24) is rotatably provided in the second groove (22), and the second bevel gear (24) is meshingly connected with the first bevel gear (23); a rotating shaft (1) is rotatably provided between the two opposite sides of the second grooves (22), one end of the rotating shaft (1) passes through the mounting plate (8) and the fixed sleeve is provided with a gear (2), the gear (2) meshes with the rack (31) when in contact, a limiting assembly is provided between the second bevel gear (24) and the rotating shaft (1), and the rotating shaft (1) drives the second bevel gear (24) to rotate through the limiting assembly.

2. The UV dryer used in the preparation process of thermal transfer film according to claim 1, characterized in that: A pressure plate (21) is arranged below the slide plate (10), a slide bar (11) is fixedly and symmetrically arranged on the top of the pressure plate (21), the top end of the slide bar (11) passes through the slide plate (10) upward and is slidably connected to the slide plate (10), a second spring (19) is sleeved on the slide bar (11), one end of the second spring (19) is fixedly connected to the slide plate (10), and the other end of the second spring (19) is fixedly connected to the pressure plate (21).

3. The UV dryer used in the preparation process of thermal transfer film according to claim 1, characterized in that: The driving mechanism comprises a motor (4), the motor (4) being fixedly arranged at the bottom of a workbench (5), a first screw rod (6) being fixedly arranged at the output end of the motor (4), the first screw rod (6) passing through the bottom of a mounting cover (26) and being threadedly connected to the mounting cover (26), a fixing block (9) being fixedly arranged at the bottom of the workbench (5), and an end of the first screw rod (6) away from the motor (4) being rotatably connected to the fixing block (9).

4. The UV dryer used in the preparation process of thermal transfer film according to claim 1, characterized in that: The limiting assembly comprises a guide groove and a guide block, the guide groove is formed on the rotating shaft (1) along the length direction of the rotating shaft (1), the second bevel gear (24) is sleeved on the rotating shaft (1), the guide block is fixedly arranged on the inner wall of the second bevel gear (24), and the guide block is slidably connected to the guide groove.

5. The UV dryer used in the preparation process of thermal transfer film according to claim 4, characterized in that: A placement plate (16) is placed on the top of the workbench (5), and the placement plate (16) is located between the two mounting plates (8). A cylinder (12) is fixedly arranged at the bottom of the workbench (5), and a cylinder rod is sealed and slidably arranged inside the cylinder (12). A first fixing plate (13) is fixedly arranged at the bottom of the mounting cover (26), and the cylinder rod slides through the first fixing plate (13). A circular plate (17) is fixedly sleeved on the cylinder rod, and a first spring (14) is fixedly arranged between the circular plate (17) and the first fixing plate (13); two symmetrically arranged piston cylinders (15) are fixedly arranged on the top of the workbench (5), and the piston rods of the two piston cylinders (15) are fixedly connected to the corresponding mounting plates (8). The two piston cylinders (15) are connected to the inside of the cylinder (12) through pipelines. A first groove (18) is opened on the workbench (5), and the bottoms of the two mounting plates (8) are slidably connected to the first groove (18).

6. The UV dryer used in the preparation process of thermal transfer film according to claim 5, characterized in that: A first movable plate (27) and a second movable plate (30) are slidably arranged on the top wall of the mounting cover (26), and a limiting plate (28) is slidably and snap-fittedly arranged at the bottom of the first movable plate (27) and the second movable plate (30). The limiting plate (28) corresponds to the mounting plate (8) one by one, and the bottom end of the limiting plate (28) is fixedly connected to the mounting plate (8). A fourth groove (32) is provided on the first movable plate (27) along its length direction. The irradiation lamp (7) is located between the first movable plate (27) and the second movable plate (30) and is arranged in an inclined manner. One end of the irradiation lamp is slidably connected to the fourth groove (32), and the other end of the irradiation lamp (7) is hingedly connected to the second movable plate (30).

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