Injection molding equipment for sports equipment

Abstract

The present invention relates to the field of sports equipment processing facilities, and in particular to an injection molding processing device for sports equipment, comprising a bearing platform, wherein two shaft seats are symmetrically fixedly installed at the front of the upper end of the bearing platform, and two flip shafts are symmetrically installed between the two shaft seats, and the flip shafts are rotationally matched with the shaft seats, and the rear ends of the two flip shafts are coaxially inlaid with flip gears, and the two flip gears are meshed, and the opposite sides of the two flip shafts are connected to ball seats, and the two ball seats are symmetrically arranged, and a leveling piece is installed at the middle of the upper end of the bearing platform, and a glue injection piece is installed at the upper end side edge of the bearing platform. The present invention reduces the labor intensity of workers, and can glue and join multiple table tennis balls at the same time, effectively improving the processing efficiency and ensuring the normal progress of the joining operation.

Description

Technical Field

[0001] The invention relates to the field of sports equipment processing facilities, in particular to an injection molding processing device for sports equipment. Background Art

[0002] Playing table tennis is one of the sports that people love nowadays. In the process of processing table tennis balls, the table tennis ball raw materials need to be injected into table tennis ball molds first, and then cooled and formed into two semicircular table tennis balls. Then, the two prefabricated halves of the table tennis balls are joined together with glue to form a whole table tennis ball. However, when joining the two prefabricated halves of the table tennis balls together, workers usually do it manually, which greatly increases the labor intensity of the workers. Only one table tennis ball can be joined at a time, and the joining speed is slow, which seriously affects the joining efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an injection molding processing equipment for sports equipment.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a kind of injection molding processing equipment for sports equipment, including a supporting platform, two axle seats are symmetrically fixedly installed on the front part of the upper end of the supporting platform, two flip shafts are symmetrically installed between the two axle seats, the flip shafts are rotatably matched with the axle seats, the rear ends of the two flip shafts are coaxially inlaid with flip gears, the two flip gears are meshed, the opposite sides of the two flip shafts are connected with ball seats, the two ball seats are symmetrically arranged, a leveling piece is installed in the middle part of the upper end of the supporting platform, and a glue injection piece is installed at the side edge of the upper end of the supporting platform.

[0005] Preferably, a No. 2 servo motor is fixedly installed on the front end of the front shaft seat, and the output end of the No. 2 servo motor is fixed to the front end of one of the flip shafts. A plurality of ball grooves are provided at the upper end of the ball seat, and the plurality of ball grooves are arranged in a square array. Air passages are provided on the inner bottom surfaces of the plurality of ball grooves, and the plurality of air passages are interconnected. An air pipe is fixedly installed on the side of the ball seat, and the air pipe is connected to the air passage, and a limiting column extends from the upper corner of one of the ball seats.

[0006] Preferably, the leveling member includes a rod seat fixedly mounted on the middle part of the upper end surface of the supporting platform, a No. 2 threaded rod is rotatably mounted inside the rod seat, the No. 2 threaded rod passes through the upper end of the rod seat, a threaded sleeve is screwed on the outer surface of the No. 2 threaded rod, a bridge is connected to the front end of the threaded sleeve, a cover seat is fixedly mounted on both ends of the bridge, a plurality of leveling covers are fixedly mounted on the lower end of the cover seat, the plurality of leveling covers are arranged in a square array, and the leveling cover is located directly above the ball groove.

[0007] Preferably, a No. 3 servo motor is fixedly installed on the upper end of the rod seat, and the output end of the No. 3 servo motor is fixed to the upper end of the No. 2 threaded rod, and an extension frame is fixedly installed on the rear end of the bridge frame, and the end of the extension frame is fixed to the threaded sleeve, and sliders extend on both sides of the threaded sleeve, and sliding grooves are penetrated on both sides of the rod seat, and the sliders fit inside the sliding grooves.

[0008] Preferably, the glue injection part includes an extension platform fixedly mounted at the upper end edge of the carrier platform, the upper end of the extension platform is connected to a top platform, the top platform is located directly behind one of the ball seats, the front upper part of the top platform is connected to a rear carrier, a front carrier is arranged in front of the rear carrier, a plurality of pipe racks are fixedly mounted on a linear array at the rear end of the front carrier, a plurality of glue spray heads are penetrated and installed on a linear array on the upper end surface of the pipe rack, and the glue spray heads are rotatably matched with the pipe racks.

[0009] Preferably, a limit seat is provided in front of the front carrier, and both ends of the limit seat are penetrated and inlaid with fixing columns, and the lower ends of the fixing columns are fixed to the supporting platform, and two L-shaped frames are symmetrically fixedly installed at the rear end of the rear carrier, and the lower ends of the L-shaped frames are fixed to the upper end of the top platform, and a plurality of tooth plates are fixedly installed in a linear array on the front end surface of the rear carrier, and a rotating gear is coaxially inlaid on the upper outer surface of the glue spray head, and the rotating gear is meshed with the tooth plate.

[0010] Preferably, two fixing ears extend symmetrically on the side of the pipe rack, a load-bearing prism is embedded between the two fixing ears, a load-bearing sleeve is fitted on the outer surface of the load-bearing prism, a connecting plate is fixedly installed on the side of the load-bearing sleeve, the end of the connecting plate is fixed to the tooth plate, a spring body is wrapped around the outside of the load-bearing prism, one end of the spring body is fixed to the front fixing ear, and the other end of the spring body is fixed to the front end of the load-bearing sleeve, and the upper end of the glue spray head is connected to a rubber hose.

[0011] Preferably, a No. 1 threaded rod is screwed on the middle part of the lower end of the top platform, and the No. 1 threaded rod is rotatably mounted on the upper end of the extension platform. A guide seat is fixedly mounted on the edge of the lower end of the top platform, and a guide frame is slidably mounted inside the guide seat. A frame seat is inlaid on the end of the guide frame, and the lower end of the frame seat is fixed on the extension platform. A No. 1 servo motor is fixedly mounted on the rear edge of the upper end of the extension platform, and the output end of the No. 1 servo motor is fixed to the rear end of the No. 1 threaded rod.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By setting up two ball seats, multiple prefabricated two-half ping-pong balls can be placed in the ball grooves on the two ball seats respectively, and then the air pipe sucks out the air in the airway to form a negative pressure, so that the multiple prefabricated two-half ping-pong balls can be firmly fixed in the ball grooves, and then the No. 2 servo motor works to drive the flip shaft to rotate relative to each other through the flip gear, so that the two ball seats can rotate towards each other and fit together, so that the multiple two-half ping-pong balls on the two ball seats can be joined together to form multiple whole ping-pong balls. The process does not require workers to manually join, thereby effectively reducing the labor intensity of workers, and can simultaneously join multiple ping-pong balls, effectively improving processing efficiency.

[0014] 2. The rotating No. 2 threaded rod can drive the threaded sleeve to move downward. At this time, the slider slides in the slide groove to assist the threaded sleeve to move downward, thereby driving multiple leveling covers at both ends of the bridge to move downward, so that the leveling cover can move downward to press the semicircular ping-pong ball in the ball groove, so that the semicircular ping-pong ball with an inclined end face can slide in the ball groove to adjust it to a horizontal state, so as to avoid the two halves of the ping-pong ball from being unable to align and engage during subsequent engagement, thereby ensuring the normal engagement operation.

[0015] 3. The moving top platform can drive the rear carrier and the front carrier to move forward. When the front carrier is on the limit seat, the multiple glue spray heads are just aligned with the edges of the multiple semicircular ping-pong balls. Then the top platform continues to move. At this time, the front carrier remains stationary due to the limit seat, and the rear carrier continues to move the toothed plate. At the same time, the bearing sleeve slides on the bearing prism and the spring body contracts and deforms, so that the moving toothed plate drives the rotating gear to rotate, and then drives the multiple glue spray heads to rotate, so that the end of the glue spray head can rotate in a circle, so as to apply glue to the circumference of multiple semicircular ping-pong balls at the same time, so as to shorten the gluing time and further improve the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an injection molding processing device for sports equipment of the present invention;

[0017] Figure 2 The present invention is a kind of sports equipment injection molding processing equipment Figure 1 A magnified view of middle;

[0018] Figure 3 This is a schematic diagram of an axle seat of an injection molding processing device for sports equipment of the present invention;

[0019] Figure 4 It is a schematic diagram of another perspective of an injection molding processing device for sports equipment of the present invention;

[0020] Figure 5 It is a schematic diagram of a rear carrier of an injection molding processing device for sports equipment of the present invention;

[0021] Figure 6 The present invention is a schematic diagram of a glue spraying head of an injection molding processing device for sports equipment.

[0022] In the figure: 1, bearing platform; 2, shaft seat; 3, fixing column; 4, limit seat; 5, ball seat; 6, air pipe; 7, rod seat; 8, bridge frame; 9, cover seat; 10, leveling cover; 11, front carrier; 12, extension platform; 13, guide frame; 14, guide seat; 15, top platform; 16, L-shaped frame; 17, rear carrier; 18, frame seat; 19, No. 1 threaded rod; 20, No. 1 servo motor; 21, rotating gear; 22, glue spray head ; 23. Pipe rack; 24. Load-bearing sleeve; 25. Load-bearing prism; 26. Tooth plate; 27. Fixing ear; 28. Spring body; 29. ​​Connecting plate; 30. Ball groove; 31. Hose; 32. Airway; 33. Flip shaft; 34. Flip gear; 35. No. 2 servo motor; 36. Limit column; 37. No. 2 threaded rod; 38. Threaded sleeve; 39. Slider; 40. Slide; 41. Extension frame; 42. No. 3 servo motor. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] like Figure 1-Figure 6 The injection molding processing equipment of a sports equipment shown in the figure includes a bearing platform 1, two shaft seats 2 are symmetrically fixedly installed on the front part of the upper end of the bearing platform 1, two flip shafts 33 are symmetrically installed between the two shaft seats 2, the shaft seats 2 play a role in supporting the flip shaft 33, the flip shaft 33 and the shaft seats 2 rotate in coordination, the rear ends of the two flip shafts 33 are coaxially inlaid with flip gears 34, the flip gears 34 play a role in allowing the two flip shafts 33 to rotate relative to each other, the two flip gears 34 are meshed, and ball seats 5 are connected to the opposite sides of the two flip shafts 33, the two ball seats 5 are symmetrically arranged, and the ball seats 5 play a role in supporting a semicircular ping-pong ball, a leveling piece is installed in the middle part of the upper end of the bearing platform 1, and a glue injection piece is installed at the upper side edge of the bearing platform 1.

[0025] A second servo motor 35 is fixedly installed at the front end of the front shaft seat 2, and the output end of the second servo motor 35 is fixed to the front end of one of the flip shafts 33. The second servo motor 35 drives the flip shaft 33 to rotate. A plurality of ball grooves 30 are provided at the upper end of the ball seat 5. The ball grooves 30 limit the semicircular ping-pong balls. When the semicircular ping-pong balls are placed in the ball grooves 30, the edges of the semicircular ping-pong balls will be higher than the edges of the ball grooves 30 to ensure that the two semicircular ping-pong balls can engage with each other after the two ball seats 5 are flipped and closed. 30 are arranged in a square array, and air passages 32 are provided on the inner bottom surfaces of the multiple ball grooves 30, and the multiple air passages 32 are connected. An air pipe 6 is fixedly installed on the side of the ball seat 5, and the air pipe 6 is connected to the air passage 32. The air pipe 6 is connected to an external air pump to suck out air to form a negative pressure to fix the semicircular ping-pong ball. Because this fixing method is a prior art, it is not elaborated in detail here. A limiting column 36 extends from the upper corner of one of the ball seats 5, and the limiting column 36 serves to prevent the two ball seats 5 from being excessively squeezed and causing damage to the ping-pong ball.

[0026] The leveling member includes a rod seat 7 fixedly installed in the middle of the upper end surface of the supporting platform 1, and a No. 2 threaded rod 37 is rotatably installed inside the rod seat 7. The rod seat 7 plays a role in supporting the No. 2 threaded rod 37. The No. 2 threaded rod 37 passes through the upper end of the rod seat 7, and a threaded sleeve 38 is screwed on the outer surface of the No. 2 threaded rod 37. The No. 2 threaded rod 37 and the threaded sleeve 38 play a role in driving the leveling cover 10 to move up and down. The front end of the threaded sleeve 38 is connected to a bridge frame 8, and both ends of the bridge frame 8 are fixedly installed with a cover seat 9. A plurality of leveling covers 10 are fixedly installed at the lower end of the cover seat 9. The cover seat 9 plays a role in fixing the leveling cover 10. The plurality of leveling covers 10 are arranged in a square array, and the leveling cover 10 is located directly above the ball groove 30.

[0027] A No. 3 servo motor 42 is fixedly installed on the upper end of the rod seat 7. The No. 3 servo motor 42 drives the No. 2 threaded rod 37 to rotate. The output end of the No. 3 servo motor 42 is fixed to the upper end of the No. 2 threaded rod 37. An extension frame 41 is fixedly installed on the rear end of the bridge frame 8. The end of the extension frame 41 is fixed to the threaded sleeve 38. The extension frame 41 plays a connecting and fixing role. Slide blocks 39 extend on both sides of the threaded sleeve 38. Slide grooves 40 are penetrated on both sides of the rod seat 7. The slide block 39 and the slide groove 40 play a guiding role. The slide block 39 fits inside the slide groove 40.

[0028] The glue injection part includes an extension platform 12 fixedly installed at the upper end edge of the carrier platform 1, the upper end of the extension platform 12 is connected to a top platform 15, the extension platform 12 plays a supporting role, the top platform 15 is located directly behind one of the ball seats 5, the front upper part of the top platform 15 is connected to a rear carrier 17, the front carrier 11 is arranged in front of the rear carrier 17, the front carrier 11 plays a role of supporting the pipe rack 23, a plurality of pipe racks 23 are fixedly installed in a linear array at the rear end of the front carrier 11, a plurality of glue spray heads 22 are installed through the linear array on the upper end surface of the pipe rack 23, the rear carrier 17 plays a role of supporting the tooth plate 26, and the glue spray head 22 rotates with the pipe rack 23.

[0029] A limit seat 4 is arranged in front of the front carrier 11, and both ends of the limit seat 4 are penetrated and inlaid with fixed columns 3. The limit seat 4 serves to limit the forward movement distance of the front carrier 11, and the lower end of the fixed column 3 is fixed to the bearing platform 1, and the fixed column 3 serves to fix the limit seat 4. Two L-shaped frames 16 are symmetrically fixedly installed at the rear end of the rear carrier 17, and the lower end of the L-shaped frame 16 is fixed to the upper end of the top platform 15, and the L-shaped frame 16 serves to fix the rear carrier 17. A plurality of tooth plates 26 are fixedly installed in a linear array on the front end surface of the rear carrier 17, and a rotating gear 21 is coaxially inlaid on the upper outer surface of the glue spray head 22, and the rotating gear 21 is meshed with the tooth plate 26, and the tooth plate 26 and the rotating gear 21 serve to drive the end of the glue spray head 22 to rotate in a circle.

[0030] Two fixing ears 27 are symmetrically extended from the side of the pipe frame 23, and a load-bearing prism 25 is embedded between the two fixing ears 27. The fixing ears 27 play a role in fixing the load-bearing prism 25. The outer surface of the load-bearing prism 25 is fitted with a load-bearing sleeve 24. A connecting plate 29 is fixedly installed on the side of the load-bearing sleeve 24. The end of the connecting plate 29 is fixed to the tooth plate 26. The load-bearing prism 25 and the load-bearing sleeve 24 play a role in guiding the tooth plate 26. A spring body 28 is wound around the outer side of the load-bearing prism 25, and one end of the spring body 28 is connected to the fixing ear 27 at the front. The other end of the spring body 28 is fixed to the front end of the bearing sleeve 24. The spring body 28 can offset the subsequent thrust when the front carrier 11 is against the limit seat 4, so that the front carrier 11 remains stationary. The upper end of the glue spray head 22 is connected to a rubber hose 31. The rubber hose 31 serves to deliver glue into the glue spray head 22 to hit the circumference of the semicircular ping-pong ball. The rubber hose 31 is connected to an external glue spraying machine. It is a prior art to pressurize the colloid and extrude it through the glue spray head 22 for gluing, and has been widely used, so it is not elaborated here.

[0031] A threaded rod No. 19 is screwed on the middle part of the lower end of the top platform 15, and the threaded rod No. 19 is rotatably installed on the upper end of the extension platform 12. The threaded rod No. 19 drives the top platform 15 to move. A guide seat 14 is fixedly installed at the lower end edge of the top platform 15, and a guide frame 13 is slidably installed inside the guide seat 14. The guide seat 14 and the guide frame 13 guide the top platform 15. A frame seat 18 is inlaid on the end of the guide frame 13, and the lower end of the frame seat 18 is fixed on the extension platform 12. The frame seat 18 fixes the guide frame 13. A servo motor No. 20 is fixedly installed at the rear edge of the upper end of the extension platform 12, and the output end of the servo motor 20 is fixed to the rear end of the threaded rod No. 19, and the servo motor 20 drives the threaded rod No. 19 to rotate.

[0032] During processing, a plurality of prefabricated two halves of ping-pong balls are placed in the ball grooves 30 on the two ball seats 5 respectively, and then the No. 3 servo motor 42 drives the No. 2 threaded rod 37 to rotate, so that the rotating No. 2 threaded rod 37 drives the threaded sleeve 38 to move downward, and at this time, the slider 39 slides in the slide groove 40 to assist the threaded sleeve 38 to move downward, thereby driving the plurality of leveling covers 10 at both ends of the bridge frame 8 to move downward, so that the leveling covers 10 can move downward to press the semicircular ping-pong balls in the ball groove 30, so that the semicircular ping-pong balls with inclined end faces can slide in the ball groove 30 to adjust them to a horizontal state, and then the air pipe 6 sucks out the air in the airway 32 to form a negative pressure, so that the plurality of prefabricated two halves of ping-pong balls can be firmly fixed in the ball groove 30, and then the No. 1 servo motor 20 works to drive the No. 1 threaded rod 19 to rotate, so that the top platform 15 screwed on the No. 1 threaded rod 19 moves, and at this time, the guide seat 14 slides on the guide frame 13 to assist the top platform 15 to move , so as to utilize the movable top platform 15 to drive the rear carrier 17 and the front carrier 11 to move forward. When the front carrier 11 is on the limit seat 4, the multiple glue spraying heads 22 are just aligned with the edges of the multiple semicircular ping-pong balls. Then the top platform 15 continues to move. At this time, the front carrier 11 is limited by the limit seat 4 and remains stationary. The rear carrier 17 continues to move the tooth plate 26 to move. At the same time, the bearing sleeve 24 slides on the bearing prism 25 and the spring body 28 shrinks and deforms. The movable tooth plate 26 is used to drive the rotating gear 21 to rotate, thereby driving the multiple glue spraying heads 22 to rotate, so that the ends of the glue spraying heads 22 can rotate in a circle, so as to simultaneously apply glue to the circumference of the multiple semicircular ping-pong balls. Then the second servo motor 35 works to drive the flip shaft 33 to rotate relative to each other through the flip gear 34, so that the two ball seats 5 can rotate towards each other and fit together, so that the multiple two halves of the ping-pong balls on the two ball seats 5 can be joined together to form multiple whole ping-pong balls.

[0033] 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 only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An injection molding processing device for sports equipment, comprising a support platform (1), characterized in that: Two shaft seats (2) are symmetrically fixedly installed at the front of the upper end of the bearing platform (1), and two flip shafts (33) are symmetrically installed between the two shaft seats (2). The flip shafts (33) are rotatably matched with the shaft seats (2). The rear ends of the two flip shafts (33) are coaxially inlaid with flip gears (34), and the two flip gears (34) are meshed. The opposite sides of the two flip shafts (33) are connected to ball seats (5), and the two ball seats (5) are symmetrically arranged. A leveling piece is installed in the middle of the upper end of the bearing platform (1), and a glue injection piece is installed at the upper side edge of the bearing platform (1); A second servo motor (35) is fixedly mounted on the front end of the shaft seat (2) at the front, and the output end of the second servo motor (35) is fixed to the front end of one of the flip shafts (33). A plurality of ball grooves (30) are provided on the upper end of the ball seat (5), and the plurality of ball grooves (30) are arranged in a square array. An air passage (32) is provided on the inner bottom surface of the plurality of ball grooves (30), and the plurality of air passages (32) are connected. An air pipe (6) is fixedly mounted on the side of the ball seat (5), and the air pipe (6) is connected to the air passage (32). A limiting column (36) extends from the upper corner of one of the ball seats (5); The leveling member comprises a rod seat (7) fixedly mounted on the middle part of the upper end surface of the bearing platform (1), a No. 2 threaded rod (37) being rotatably mounted inside the rod seat (7), the No. 2 threaded rod (37) passing through the upper end of the rod seat (7), a threaded sleeve (38) being screwed onto the outer surface of the No. 2 threaded rod (37), a bridge (8) being connected to the front end of the threaded sleeve (38), a cover seat (9) being fixedly mounted on both ends of the bridge (8), a plurality of leveling covers (10) being fixedly mounted on the lower end of the cover seat (9), the plurality of leveling covers (10) being arranged in a square array, and the leveling covers (10) being located directly above the ball groove (30); The glue injection part comprises a protruding platform (12) fixedly mounted at the upper edge of the supporting platform (1), the upper end of the protruding platform (12) is connected to a top platform (15), the top platform (15) is located directly behind one of the ball seats (5), the front upper part of the top platform (15) is connected to a rear carrier (17), a front carrier (11) is arranged in front of the rear carrier (17), a plurality of pipe racks (23) are fixedly mounted in a linear array at the rear end of the front carrier (11), a plurality of glue spray heads (22) are installed in a linear array through the upper end surface of the pipe rack (23), and the glue spray heads (22) are rotatably matched with the pipe rack (23); A limit seat (4) is arranged in front of the front carrier (11), and both ends of the limit seat (4) are penetrated and inlaid with fixed columns (3), and the lower end of the fixed column (3) is fixed to the bearing platform (1), and two L-shaped frames (16) are symmetrically fixedly installed at the rear end of the rear carrier (17), and the lower end of the L-shaped frame (16) is fixed to the upper end of the top platform (15), and a plurality of tooth plates (26) are fixedly installed in a linear array on the front end surface of the rear carrier (17), and a rotating gear (21) is coaxially inlaid on the upper part of the outer surface of the glue spray head (22), and the rotating gear (21) is meshed with the tooth plate (26); Two fixing ears (27) are symmetrically extended from the side of the pipe rack (23), a load-bearing prism (25) is embedded between the two fixing ears (27), a load-bearing sleeve (24) is fitted on the outer surface of the load-bearing prism (25), a connecting plate (29) is fixedly installed on the side of the load-bearing sleeve (24), the end of the connecting plate (29) is fixed to the tooth plate (26), a spring body (28) is wound around the outer side of the load-bearing prism (25), one end of the spring body (28) is fixed to the front fixing ear (27), and the other end of the spring body (28) is fixed to the front end of the load-bearing sleeve (24), and the upper end of the glue spray head (22) is connected to a rubber hose (31).

2. The injection molding processing equipment for sports equipment according to claim 1, characterized in that: A No. 3 servo motor (42) is fixedly mounted on the upper end of the rod seat (7), and the output end of the No. 3 servo motor (42) is fixed to the upper end of the No. 2 threaded rod (37). A protruding frame (41) is fixedly mounted on the rear end of the bridge frame (8), and the end of the protruding frame (41) is fixed to the threaded sleeve (38). Slide blocks (39) extend from both sides of the threaded sleeve (38). Slide grooves (40) are penetrated through both sides of the rod seat (7), and the slide blocks (39) fit inside the slide grooves (40).

3. The injection molding processing equipment for sports equipment according to claim 1, characterized in that: A threaded rod (19) is screwed onto the middle part of the lower end of the top platform (15), and the threaded rod (19) is rotatably mounted on the upper end of the extension platform (12). A guide seat (14) is fixedly mounted on the lower edge of the top platform (15), and a guide frame (13) is slidably mounted inside the guide seat (14). A frame seat (18) is embedded at the end of the guide frame (13), and the lower end of the frame seat (18) is fixed on the extension platform (12). A servo motor (20) is fixedly mounted on the rear edge of the upper end of the extension platform (12), and the output end of the servo motor (20) is fixed to the rear end of the threaded rod (19).

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