Drying device of carton printing machine

Abstract

The utility model relates to the technical field of printing machine drying, in particular to a drying device of a carton printing machine. Comprising a base and further comprises a supporting table which is fixedly connected to the upper surface of the base through two supporting frames, the upper surfaces of the two supporting frames are fixedly connected with electric telescopic rods, and the telescopic ends of the two electric telescopic rods are fixedly connected with a top plate. According to the printing ink drying device, the carton body can be effectively fixed through the arranged fixing assembly, the carton body can be conveniently overturned through the arranged overturning assembly, and therefore the printing ink drying effect and efficiency can be effectively improved; according to the device, peculiar smell and poisonous gas can be effectively filtered, a worker can conveniently disassemble and assemble parts in a filtering assembly through the arranged mounting assembly, and the overall practicability of the device is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying of printing machines, in particular to a drying device of a carton printing machine. Background Art

[0002] Carton printing machine drying is a device that can print text, patterns or other information onto the surface of the carton. It generally adopts roller printing and has the characteristics of large-scale and efficient production. It generally includes plate mounting, inking, embossing, and paper feeding process. After the carton passes through the printing machine drying, the ink on the carton is not easy to dry. It is necessary to dry the ink on the carton through a dryer first. At this time, a carton printing machine drying device is needed.

[0003] In the prior art, the filter plate inside the drying device is generally integrated with the entire device, which makes it difficult for staff to disassemble and replace the filter plate conveniently and effectively. During the drying process of the ink, a large amount of odor is generated. At this time, a filter plate is needed to filter the odor. However, after long-term use, the filter plate will inevitably become clogged. If the filter plate is not disassembled and replaced at this time, the filtering effect and efficiency of the filter plate on the odor will be affected, and the odor will not be effectively filtered, which will cause the staff to feel unwell after inhaling the odor for a long time, reducing the overall practicality of the device.

[0004] Compared with the Chinese patent with publication number CN220410018U, the present utility model relates to the field of printing machine drying technology, and discloses a carton printing machine drying, including a dryer body, folding curtains are fixedly connected on both sides of the dryer body, ventilation slots are fixedly connected to the upper end of the dryer body, a plurality of support rods are fixedly connected to the lower end of the dryer body, and the upper ends of the support rods are fixedly connected to a fixed platform. In the present utility model, a carton can be placed on the upper end of the fixed platform through the fixed platform, the position of the fixed plate can be adjusted up and down according to the size of the carton, and the distance between the fixed frames on both sides can be adjusted by an electric telescopic rod to fix the carton according to the size of the carton. A rotating motor fixed on one side of the fixed frame can drive the carton to rotate, which can facilitate drying the lower end of the carton. The ventilation slots cooperate with the through holes to make the carton drying more comprehensive, and at the same time, it can also allow air to flow inside the dryer body, thereby achieving an effect similar to blowing and improving the heat drying efficiency.

[0005] The above solution can effectively filter out odors and toxic gases, but the filter block and adsorption block in the above solution are still fixed to the exhaust fan, and the staff still cannot disassemble and replace the filter block conveniently and effectively, failing to solve the problems raised in the above background technology.

[0006] Therefore, those skilled in the art provide a carton printing machine drying device to solve the problems raised in the above background technology. Utility Model Content

[0007] The purpose of the utility model is to provide a carton printing machine drying device, including a base, and also including:

[0008] A support platform is fixedly connected to the upper surface of the base through two support frames, the upper surfaces of the two support frames are fixedly connected to electric telescopic rods, and the telescopic ends of the two electric telescopic rods are fixedly connected to the top plate;

[0009] A fixing assembly is symmetrically arranged at the bottom of the support platform and is used to fix the carton body;

[0010] A turning assembly is provided outside the fixing assembly and is used to turn the carton body over;

[0011] A drying device is located below the top plate;

[0012] A filter assembly is provided on the upper surface of the top plate and is used for adsorption and filtration of odor and toxic gases;

[0013] The installation component is arranged outside the filter component and is used to disassemble and assemble the components inside the filter component.

[0014] As a further improvement of the present technical solution, the fixing assembly includes an adjusting plate symmetrically arranged at the bottom of the support platform, the internal rotation of the adjusting plate is connected to a two-way threaded rod, one end of the two-way threaded rod extends to the outside of the adjusting plate and is fixedly connected to a limit plate, the other end of one of the two-way threaded rods extends to the outside of the adjusting plate and is fixedly connected to a knob, the two two-way threaded rods are connected by a synchronous belt and a pulley transmission, and the outside of the two-way threaded rod is symmetrically provided with a threaded plate, and the contact surface of the adjusting plate and the support platform is provided with a guide groove for the threaded plate to move. The upper surface of each two threaded plates is fixedly connected to the movable plate, and the upper surfaces of the two movable plates are fixedly connected to the upper plate, and the interior of the two upper plates is penetrated by mounting holes for installing the rotating rod, one end of the rotating rod is fixedly connected to the turntable, and the other end of the rotating rod is fixedly connected to the interference plate.

[0015] As a further improvement of the technical solution, the flipping component includes a locking disc fixedly connected to the outside of the rotating rod. The upper surface of the upper plate is fixedly connected with a U-shaped plate. Guide grooves for the locking rod to move are respectively formed through both sides of the outer wall of the U-shaped plate. One end of the locking rod is fixedly connected with a pulling plate. A resisting plate is fixedly connected to the outside of the locking rod. A return spring is sleeved on the outside of the locking rod, and the return spring abuts between the resisting plate and the U-shaped plate. Guide grooves for the locking rod to move are equidistantly formed inside the locking disc.

[0016] As a further improvement of the technical solution, a transmission plate is fixedly connected to the bottom of the top plate. A driving motor is fixedly connected to one side of the transmission plate. The output shaft of the driving motor is fixedly connected with a丝杆 through a coupling. The other end of the丝杆 is rotatably connected to the inner side wall of the transmission plate. A threaded block is threadedly connected to the outside of the丝杆. A guide groove for the threaded block to move is formed at the bottom of the transmission plate. The bottom of the threaded block is fixedly connected to the upper surface of the drying device.

[0017] As a further improvement of the technical solution, the filtering component includes an air suction pump and a filtering box respectively arranged on the upper surface of the top plate. Filter plates are symmetrically arranged inside the filtering box. Connecting plates are fixedly connected to the upper surfaces of both filter plates. A handle is fixedly connected to the upper surface of the connecting plate. Plug blocks are symmetrically arranged at the bottom of the connecting plate. Fixed frames are symmetrically arranged on the front and rear surfaces of the filtering box. Guide grooves for the plug blocks to move are formed on the upper surfaces of multiple fixed frames. L-shaped plates for fixing air suction heads are fixedly connected to the front and rear surfaces of the drying device. The air inlet end of the air suction pump is connected to the inside of both air suction heads through a branch air pipe. The air outlet end of the air suction pump is connected to the inside of the filtering box through a pipeline. An exhaust pipe is connected to the outside of the filtering box.

[0018] As a further improvement of the technical solution, the installation component includes a fixing plate fixedly connected to the outside of the fixed frame. A sliding rod is fixedly connected to the inside of the fixing plate. A sliding plate is arranged inside the fixing plate. A guide groove for the sliding rod to move is formed inside the sliding plate. A resisting spring is sleeved on the outside of the sliding rod, and the resisting spring abuts between the sliding plate and the fixing plate. Pulling rods are symmetrically arranged on the outside of the sliding plate. The other ends of every two pulling rods are fixedly connected with an outer plate. Fixed rods are symmetrically arranged on the opposite sides of every two sliding plates. Guide grooves for the fixed rods to move are formed on the contact surfaces of the fixing plate and the fixed frame. Guide grooves for the fixed rods to move are formed inside the plug block.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] In the carton printing machine drying device, by providing a fixing component, a flip component, a filter component and an installation component, when it is necessary to dry the ink on the outside of the carton body, it is only necessary to fix the carton body by the fixing component first. When the carton body is fixed, the drying device starts to operate, and the ink on the outside of the carton body can be dried by the drying device at this time. When the carton body needs to be flipped, it is only necessary to flip the carton body conveniently by the flip component, so that the ink on the outside of the carton body can be dried more comprehensively, effectively improving the drying efficiency and effect of the ink on the outside of the carton body. When the ink is dried, a large amount of odor and toxic gas will be generated. At this time, the filter component starts to operate, and the filter component can effectively adsorb and filter the odor and toxic gas, thereby effectively protecting the health of the staff and the environment. When it is necessary to disassemble and replace the parts inside the filter component, it is only necessary to use the installation component to conveniently and effectively disassemble and assemble the parts inside the filter component, thereby effectively improving the filtering effect and efficiency of the filter component, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cutaway three-dimensional structure of the adjustment plate in the present invention;

[0023] Figure 3 This is a schematic diagram of the cutaway three-dimensional structure of the transmission plate in the present invention;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the utility model after the filter plate is disassembled;

[0025] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of area A in the middle;

[0026] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of area B in the middle.

[0027] The meaning of each number in the figure is:

[0028] 1. Base; 2. Support frame; 3. Electric telescopic rod; 4. Top plate; 5. Adjusting plate; 6. Carton body; 7. Drying equipment; 8. Knob; 9. Bidirectional threaded rod; 10. Threaded plate; 11. Limiting disc; 12. Synchronous belt; 13. Moving plate; 14. Upper plate; 15. Rotating rod; 16. Turntable; 17. Contact disc; 18. Transmission plate; 19. Driving motor; 20. Screw rod; 21. Threaded block; 22. Suction pump; 23. Filter box; 24. Connecting plate; 25. Filter plate; 26. Insert block; 27. Exhaust pipe; 28. Branch air pipe; 29. L-shaped plate; 30. Suction head; 31. C-shaped plate; 32. Locking rod; 33. Contact plate; 34. Return spring; 35. Locking disc; 36. Fixed plate; 37. Slide rod; 38. Slide plate; 39. Contact spring; 40. Pull rod; 41. Fixed rod; 42. Fixed frame. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1 - Figure 6 As shown, this embodiment provides a drying device for a carton printing machine, including a base 1, and further including:

[0031] A support table, fixedly connected to the upper surface of the base 1 through two support frames 2. Electric telescopic rods 3 are fixedly connected to the upper surfaces of the two support frames 2, and the telescopic ends of the two electric telescopic rods 3 are fixedly connected to a top plate 4;

[0032] A fixing component, symmetrically arranged at the bottom of the support table and used for fixing the carton body 6;

[0033] A flipping component, arranged outside the fixing component and used for flipping the carton body 6;

[0034] Drying equipment 7, located below the top plate 4;

[0035] A filtering component, arranged on the upper surface of the top plate 4 and used for adsorbing and filtering odors and toxic gases;

[0036] An installation component, arranged outside the filtering component and used for disassembling and assembling the components inside the filtering component.

[0037] The above working principle: when it is necessary to dry the ink on the outside of the carton body 6, it is only necessary to fix the carton body 6 through the fixing component first. When the carton body 6 is fixed, the drying equipment 7 starts to run. At this time, the ink on the outside of the carton body 6 can be dried by the drying equipment 7. When the carton body 6 needs to be flipped, it is only necessary to flip the carton body 6 conveniently through the flipping component, so that the ink on the outside of the carton body 6 can be dried more comprehensively, effectively improving the drying efficiency and effect of the ink on the outside of the carton body 6. When the ink is dried, a large amount of odor and toxic gas will be generated. At this time, the filter component starts to run, and the filter component can effectively adsorb and filter the odor and toxic gas, thereby effectively protecting the health of the staff and the environment. When it is necessary to disassemble and replace the parts inside the filter component, it is only necessary to use the installation component to conveniently and effectively disassemble and assemble the parts inside the filter component, thereby effectively improving the filtering effect and efficiency of the filter component, saving time and effort.

[0038] In order to effectively fix the carton body 6, the fixing component includes an adjusting plate 5 symmetrically arranged at the bottom of the support platform. The internal rotation of the adjusting plate 5 is connected with a two-way threaded rod 9. One end of the two-way threaded rod 9 extends to the outside of the adjusting plate 5 and is fixedly connected to the limit plate 11. The other end of one of the two-way threaded rods 9 extends to the outside of the adjusting plate 5 and is fixedly connected with a knob 8. The two two-way threaded rods 9 are connected by a synchronous belt 12 and a pulley transmission. The outside of the two-way threaded rod 9 is symmetrically provided with a threaded plate 10. The contact surface of the adjusting plate 5 and the support platform is provided with a guide groove for the movement of the threaded plate 10. The upper surface of each two threaded plates 10 is fixedly connected to a movable plate 13. The upper surfaces of the two movable plates 13 are fixedly connected to an upper plate 14. The interiors of the two upper plates 14 are penetrated with mounting holes for installing the rotating rod 15. One end of the rod 15 is fixedly connected to a turntable 16, and the other end of the rotating rod 15 is fixedly connected to a contact disk 17. When the carton body 6 needs to be fixed, the carton body 6 only needs to be placed between the two contact disks 17 first, and then the knob 8 is turned. The knob 8 will drive one of the two-way threaded rods 9 to rotate synchronously. Since the two two-way threaded rods 9 are connected by a synchronous belt 12 and a pulley for transmission, the two two-way threaded rods 9 will rotate synchronously at this time, and the threaded plate 10 will move synchronously on the outside of the two-way threaded rod 9, driving the movable plate 13 to move synchronously, and the movable plate 13 will drive the upper plate 14 and the contact disk 17 to move synchronously. When the opposite sides of the two contact disks 17 are in contact with the outside of the carton body 6, the carton body 6 can be effectively fixed and clamped by the contact disk 17.

[0039] The cam 33 is fixedly connected to the top of the cam 33 and the cam 33 is fixedly connected to the top of the cam 33 so as to prevent the cam 33 from sliding out of the cam 33. The cam 33 is fixedly connected to the top of the cam 33 and the cam 33 is fixedly connected to the top ... When the locking rod 32 is inserted into the guide groove inside the locking disk 35, the locking disk 35 can be locked. At this time, the angular position of the carton body 6 can be fixed, thereby facilitating the drying equipment 7 to dry the ink on the outside of the carton body 6.

[0040] In order to effectively adjust and move the left and right positions of the drying device 7, a transmission plate 18 is fixedly connected to the bottom of the top plate 4, and a drive motor 19 is fixedly connected to one side of the transmission plate 18. The output shaft of the drive motor 19 is fixedly connected to a screw rod 20 through a coupling. The other end of the screw rod 20 is rotatably connected to the inner side wall of the transmission plate 18, and the external thread of the screw rod 20 is connected to a threaded block 21. A guide groove for the movement of the threaded block 21 is provided at the bottom of the transmission plate 18. The bottom of the threaded block 21 is fixedly connected to the upper surface of the drying device 7. When the left and right positions of the drying device 7 need to be adjusted and moved, the drive motor 19 starts to run. At this time, the drive motor 19 will drive the screw rod 20 to rotate synchronously, and the threaded block 21 will move synchronously on the outside of the screw rod 20, driving the drying device 7 to move synchronously. At this time, the working position of the drying device 7 can be adjusted and moved, so that the drying device 7 can more comprehensively dry the ink on the outside of the carton body 6, effectively improving the drying efficiency and effect of the ink.

[0041] In order to effectively absorb and filter odors and toxic gases, the filter assembly includes an air suction pump 22 and a filter box 23 respectively arranged on the upper surface of the top plate 4. The interior of the filter box 23 is symmetrically provided with filter plates 25. The upper surfaces of the two filter plates 25 are fixedly connected to a connecting plate 24. The upper surface of the connecting plate 24 is fixedly connected to a handle. The bottom of the connecting plate 24 is symmetrically provided with an insert 26. The front end surface and the rear end surface of the filter box 23 are symmetrically provided with a fixing frame 42. The upper surfaces of the multiple fixing frames 42 are provided with guide grooves for the movement of the insert 26. The front end surface and the rear end surface of the drying equipment 7 are fixedly connected with an L-shaped plate 29 for fixing the air suction head 30. The air inlet end of the air suction pump 22 is connected to the interior of the two air suction heads 30 through the air distribution pipe 28. The air suction pump 2 The air outlet end of 2 is connected to the interior of the filter box 23 through a pipe, and the outside of the filter box 23 is connected to the exhaust pipe 27. In the process of drying the ink, a large amount of odor and toxic gas will be generated. At this time, the suction pump 22 starts to run, and the suction pump 22 will draw the odor and toxic gas into the interior of the gas distribution pipe 28 through the suction head 30, and then transmit it to the interior of the filter box 23 through the pipe. When the toxic gas enters the interior of the filter box 23, the filter plate 25 can effectively filter and purify the gas. When the gas filtration is completed, it will be discharged through the exhaust pipe 27. At this time, the odor and toxic gas can be effectively adsorbed and filtered, thereby effectively protecting the environment and the health of the staff, and effectively improving the overall practicality of the device.

[0042] In addition, in order to facilitate the staff to install the filter plate 25, the installation assembly includes a fixing plate 36 fixedly connected to the outside of the fixing frame 42, the inside of the fixing plate 36 is fixedly connected to the sliding rod 37, the inside of the fixing plate 36 is provided with a slide plate 38, the inside of the slide plate 38 is provided with a guide groove for the sliding rod 37 to move, the outside of the slide rod 37 is provided with a resistance spring 39, the resistance spring 39 is in contact between the slide plate 38 and the fixing plate 36, the outside of the slide plate 38 is symmetrically provided with pull rods 40, the other end of each two pull rods 40 is fixedly connected to the outer plate, and the opposite side of each two slide plates 38 is symmetrically provided with fixing rods 41, the contact surface of the fixing plate 36 and the fixing frame 42 is provided with a guide groove for the fixing rod 41 to move, and the inside of the plug block 26 is provided with a guide groove for the fixing rod 41 to move. When the filter plate 25 needs to be fixed and installed, it is only necessary to pull the When the outer plate is released, the outer plate will drive the pull rod 40 to move synchronously, and the pull rod 40 will drive the slide plate 38 to move synchronously on the outside of the slide rod 37. During the movement of the slide plate 38, the resistance spring 39 will be squeezed, and the slide plate 38 will also drive the fixing rod 41 to move synchronously. At this time, the plug block 26 is inserted into the inside of the fixing frame 42, and then the outer plate is released. At this time, the resistance spring 39 is reset, driving the slide plate 38 to move synchronously, and the slide plate 38 drives the fixing rod 41 to move synchronously. When the fixing rod 41 is inserted into the guide groove inside the plug block 26, the plug block 26 and the fixing frame 42 can be fixed. At this time, the filter plate 25 can be fixed and installed, and it can be convenient for the staff to disassemble and replace the filter plate 25, effectively improving the filtering effect and efficiency of the filter assembly, and further improving the overall practicality of the device.

[0043] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A carton printing machine drying device, comprising a base (1), characterized in that: It further includes: A support platform, fixedly connected to the upper surface of the base (1) through two support frames (2). Electric telescopic rods (3) are fixedly connected to the upper surfaces of the two support frames (2), and the telescopic ends of the two electric telescopic rods (3) are fixedly connected to a top plate (4); A fixing component, symmetrically arranged at the bottom of the support platform and used for fixing the carton body (6); A flipping component, arranged outside the fixing component and used for flipping the carton body (6); A drying device (7), located below the top plate (4); A filtering component, arranged on the upper surface of the top plate (4) and used for adsorbing and filtering odors and toxic gases; An installation component, arranged outside the filtering component and used for disassembling and assembling the components inside the filtering component.

2. A carton printing machine drying device according to claim 1, characterized in that: The fixing component includes adjusting plates (5) symmetrically arranged at the bottom of the support platform. A bidirectional threaded rod (9) is rotatably connected inside the adjusting plate (5). One end of the bidirectional threaded rod (9) extends outside the adjusting plate (5) and is fixedly connected to a limiting disc (11). The other end of one of the bidirectional threaded rods (9) extends outside the adjusting plate (5) and is fixedly connected to a knob (8). The two bidirectional threaded rods (9) are connected by a synchronous belt (12) through pulley drive. Threaded plates (10) are symmetrically arranged outside the bidirectional threaded rod (9). Guide grooves for the threaded plates (10) to move are formed on the contact surfaces between the adjusting plate (5) and the support platform. Moving plates (13) are fixedly connected to the upper surfaces of every two threaded plates (10). Upper plates (14) are fixedly connected to the upper surfaces of the two moving plates (13). Installation holes for installing a rotating rod (15) are formed through the interiors of the two upper plates (14). A turntable (16) is fixedly connected to one end of the rotating rod (15), and a抵触 plate (17) is fixedly connected to the other end of the rotating rod (15).

3. A carton printing machine drying device according to claim 2, characterized in that: The flipping component includes a locking disc (35) fixedly connected to the outside of the rotating rod (15). A U-shaped plate (31) is fixedly connected to the upper surface of the upper plate (14). Guide grooves for a locking rod (32) to move are formed through both sides of the outer wall of the U-shaped plate (31). A pulling plate is fixedly connected to one end of the locking rod (32). A抵触 plate (33) is fixedly connected to the outside of the locking rod (32). A return spring (34) is sleeved on the outside of the locking rod (32). The return spring (34) abuts between the抵触 plate (33) and the U-shaped plate (31). Guide grooves for the locking rod (32) to move are formed at equal intervals inside the locking disc (35).

4. A carton printing machine drying device according to claim 1, characterized in that: The bottom of the top plate (4) is fixedly connected to a transmission plate (18), one side of the transmission plate (18) is fixedly connected to a drive motor (19), the output shaft of the drive motor (19) is fixedly connected to a screw rod (20) through a coupling, the other end of the screw rod (20) is rotatably connected to the inner side wall of the transmission plate (18), the external thread of the screw rod (20) is connected to a threaded block (21), the bottom of the transmission plate (18) is provided with a guide groove for the threaded block (21) to move, and the bottom of the threaded block (21) is fixedly connected to the upper surface of the drying device (7).

5. The drying device for a carton printing machine according to claim 1, characterized in that: The filter assembly comprises an air suction pump (22) and a filter box (23) respectively arranged on the upper surface of the top plate (4); filter plates (25) are symmetrically arranged inside the filter box (23); the upper surfaces of the two filter plates (25) are fixedly connected to a connecting plate (24); the upper surfaces of the connecting plates (24) are fixedly connected to a handle; the bottom of the connecting plate (24) is symmetrically provided with an insert (26); the front end surface and the rear end surface of the filter box (23) are symmetrically provided with a fixing frame (42); a plurality of The upper surface of the fixed frame (42) is provided with a guide groove for the movement of the plug block (26); the front end surface and the rear end surface of the drying device (7) are fixedly connected with an L-shaped plate (29) for fixing the suction head (30); the air inlet end of the suction pump (22) is connected to the interior of the two suction heads (30) through an air distribution pipe (28); the air outlet end of the suction pump (22) is connected to the interior of the filter box (23) through a pipeline; the outside of the filter box (23) is connected to an exhaust pipe (27).

6. A carton printing machine drying device according to claim 5, characterized in that: The mounting assembly includes a fixed plate (36) fixedly connected to the outside of the fixed frame (42), a sliding rod (37) fixedly connected to the inside of the fixed plate (36), a slide plate (38) provided inside the fixed plate (36), a guide groove for the movement of the sliding rod (37) provided inside the slide plate (38), a resisting spring (39) provided outside the sliding rod (37), the resisting spring (39) resisting between the slide plate (38) and the fixed plate (36), a pull rod (40) symmetrically provided on the outside of the slide plate (38), the other end of each two pull rods (40) are fixedly connected to the outer plate, and a fixed rod (41) is symmetrically provided on the opposite side of each two slide plates (38), the contact surface of the fixed plate (36) and the fixed frame (42) is provided with a guide groove for the movement of the fixed rod (41), and the inside of the plug (26) is provided with a guide groove for the movement of the fixed rod (41).

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