Efficient scrap steel shearing device of caterpillar shearing machine

Abstract

The utility model relates to scrap resource recovery equipment technical field, concretely disclose a kind of scrap steel high-efficiency shearing device of caterpillar type shearing machine, including caterpillar chassis, bottom plate, shearing machine component, feeding bearing plate, feeding structure, protective cover and unfolding structure, bottom plate is installed in caterpillar chassis top, and the one end both sides of bottom plate are fixedly connected with a baffle, two baffle top are provided with a protective cover, two protective cover below are provided with unfolding structure, and shearing machine component is installed on the upper surface of bottom plate, feeding bearing plate is provided at shearing machine component feed inlet, and feeding structure is provided below feeding bearing plate, by being provided with protective cover and unfolding structure, the rotation movement of worm is converted into the rotation movement of half worm, to drive rotating rod synchronous rotation in turn, rotating rod rotation directly drives protective cover rotation around rotating rod, until protective cover rotates to closed state, can effectively block the waste material splashing generated in shearing process.

Description

Technical Field

[0001] This utility model relates to the technical field of waste resource recycling equipment, and in particular to a high-efficiency scrap steel shearing device for a tracked shearing machine. Background Technology

[0002] Tracked scrap shearing machines are mechanical equipment used for the recycling and processing of scrap metal. They are mainly used to cut various scrap steel materials into suitable sizes for easy transportation and reprocessing. Tracked scrap shearing machines are mainly composed of tracked walking mechanism, hydraulic system, shearing mechanism and other parts. The tracked chassis allows the equipment to move freely on uneven ground and adapt to various complex working environments, such as scrap steel recycling yards and construction sites.

[0003] However, existing tracked scrap shears rely on manual feeding, requiring operators to be close to the high-speed rotating shearing components, posing a safety hazard of being accidentally injured by flying scrap. Furthermore, the manual feeding speed is uneven, failing to provide a continuous and stable material supply to the shear, further reducing overall operating efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-efficiency scrap steel shearing device for a tracked shearing machine.

[0005] The high-efficiency scrap shearing device for a tracked shear provided by this utility model includes: a tracked chassis, a base plate, a shearing assembly, a feeding bearing plate, a feeding structure, a protective cover, and an unfolding structure. The base plate is installed on top of the tracked chassis. A baffle is fixedly connected to both sides of one end of the base plate. A protective cover is installed above each of the two baffles. An unfolding structure is installed below each of the two protective covers. The unfolding structure includes a rotating rod, a semi-worm gear, and a worm. The rotating rod is fixedly connected to the lower surface of the protective cover. A semi-worm gear is fixedly connected to the middle of the rotating rod, and a worm gear meshes below the semi-worm gear. The shearing assembly is installed on the upper surface of the base plate and is located inside the two protective covers. A feeding structure is provided at the feed inlet of the shearing assembly. The material carrier plate has a connecting rod fixedly connected to its lower surface. The lower end of the connecting rod is fixedly connected to the upper surface of the base plate. Four receiving slots are opened on the upper surface of the material carrier plate. A feeding structure is set below the material carrier plate. The feeding structure includes a support frame, a support plate, a sliding plate, and a lifting electric cylinder. A groove is opened on the upper surface of the support frame. The material carrier plate is located above the groove. Four support plates are fixedly connected to the upper surface of the support frame. The four support plates are located inside the four receiving slots on the upper surface of the material carrier plate. A sliding plate is set at each end of the support frame. A lifting electric cylinder is fixedly connected to the upper surface of each sliding plate. The ejector ends of the lifting electric cylinders on the upper surfaces of the two sliding plates are fixedly connected to the lower surfaces of the two ends of the support frame.

[0006] Preferably, two fixing plates are fixedly connected to the upper surface of the base plate, and a push electric cylinder is provided between the two fixing plates. The push electric cylinder is fixedly connected to the upper surface of the base plate, and two sliding rods are provided between the two fixing plates. The two ends of the two sliding rods are respectively fixedly connected to the opposite side of the two fixing plates.

[0007] Preferably, two first ear plates and two second ear plates are fixedly connected to the upper surface of the two baffles respectively, and through holes are opened on the side surfaces of the two first ear plates and the two second ear plates.

[0008] Preferably, the two ends of the rotating rod are rotatably connected to the inside of the through holes on the side surfaces of the two first ear plates, and the two ends of the worm are rotatably connected to the inside of the through holes on the side surfaces of the two second ear plates. A servo motor is provided at one end of the worm, the power output end of the servo motor is fixedly connected to one end of the worm, and the servo motor is fixedly connected to the upper surface of the baffle.

[0009] Preferably, each of the four pallets is fixedly connected to a rubber anti-slip pad, and the upper surface of the rubber anti-slip pad is provided with anti-slip grooves.

[0010] Preferably, both ends of the two sliding plates are provided with through holes, and two sliding rods are respectively slidably inserted into the through holes at both ends of the two sliding plates, and the top end of the pushing electric cylinder is fixedly connected to the outer surface of one of the sliding plates.

[0011] Compared with related technologies, the high-efficiency scrap shearing device for the tracked shear provided by this utility model has the following advantages:

[0012] 1. By setting up a protective cover and unfolding structure, the servo motor is started. The power output end of the servo motor rotates, driving the worm gear to rotate. Since the worm gear and the half worm wheel mesh with each other, and the half worm wheel is fixed in the middle of the rotating rod, the rotational motion of the worm gear is converted into the rotational motion of the half worm wheel, which in turn drives the rotating rod to rotate synchronously. The rotation of the rotating rod directly drives the protective cover to rotate around the rotating rod until the protective cover rotates to the closed state. When the protective cover is closed, it can effectively block the splashing of waste material generated during the shearing process, effectively improving the safety of scrap steel shearing.

[0013] 2. By setting up a feeding bearing plate and feeding structure, the lifting electric cylinder pushes out, driving the support frame to move upward. The upward movement of the support frame drives the pallet to move upward synchronously. The rubber anti-slip pad fixed on the upper surface of the pallet comes into contact with the scrap steel material. The friction of the rubber anti-slip pad and the anti-slip grooves prevent the scrap steel from sliding. The pallet continues to lift upward, lifting the scrap steel from the feeding bearing plate. The piston rod of the pushing electric cylinder pushes out, pushing the sliding plate connected to it to move horizontally along the sliding rod. The movement of the sliding plate drives the lifting electric cylinder, support frame and pallet above to move horizontally synchronously. The pallet carries the lifted scrap steel towards the feed inlet of the shearing machine component, continuously pushing the scrap steel on the feeding bearing plate to the feed inlet of the shearing machine component, providing a continuous and stable material supply for the shearing machine, and greatly improving the shearing efficiency. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the high-efficiency scrap steel shearing device for a tracked shearing machine provided by this utility model;

[0015] Figure 2 This is an exploded structural diagram of the present invention;

[0016] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A;

[0017] Figure 4 For the present utility model Figure 2 A magnified structural diagram at point B in the middle.

[0018] Labels in the diagram: 1. Tracked chassis; 2. Base plate; 3. Protective cover; 4. Deployment structure; 5. Shearing machine assembly; 6. Feeding bearing plate; 7. Feeding structure; 8. Baffle; 9. Rotating rod; 10. Half worm gear; 11. Worm; 12. Connecting rod; 13. Support frame; 14. Pallet; 15. Sliding plate; 16. Lifting electric cylinder; 17. Fixing plate; 18. Pushing electric cylinder; 19. Sliding rod; 20. First ear plate; 21. Second ear plate; 22. Servo motor; 23. Rubber anti-slip mat. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Please refer to the following: Figure 1 , Figure 2 and Figure 3The system includes: a tracked chassis 1, a base plate 2, a shearing machine assembly 5, a feeding support plate 6, a feeding structure 7, a protective cover 3, and an unfolding structure 4. The tracked chassis 1 serves as the mobile support foundation for the entire shearing device, possessing flexible mobility and enabling the device to move freely within the scrap steel storage area, facilitating connection with scrap steel materials in different locations. The base plate 2 is installed on top of the tracked chassis 1, serving to support and fix other components of the device, ensuring the stability of the installation positions of each component. A baffle 8 is fixedly connected to both sides of one end of the base plate 2. A protective cover 3 is installed above each of the two baffles 8, and an unfolding structure 4 is installed below each of the two protective covers 3. The unfolding structure 4 is used to drive the two protective covers 3 to unfold and close. During shearing operations, the unfolding structure... The structure 4 drives the protective cover 3 to close, effectively blocking the splashing of waste material generated during the shearing process and protecting the operator's safety. After the shearing operation is completed, the unfolding structure 4 drives the protective cover 3 to unfold, facilitating the discharge of waste material after shearing. The baffle 8 is used to support the protective cover 3 and the unfolding structure 4. The unfolding structure 4 includes a rotating rod 9, a half-worm gear 10, and a worm 11. The rotating rod 9 is fixedly connected to the lower surface of the protective cover 3. The rotating rod 9 serves as the rotation support shaft of the protective cover 3. When the rotating rod 9 rotates, it can directly drive the protective cover 3 to rotate synchronously, realizing the opening and closing of the protective cover 3. The half-worm gear 10 is fixedly connected to the middle of the rotating rod 9. The worm 11 is meshed below the half-worm gear 10. The half-worm gear 10 serves as the driven part and meshes with the worm 11 to drive the worm 11. The rotational motion of 1 is converted into its own rotational motion, which in turn drives the rotating rod 9 to rotate. Since it is a semi-worm gear 10, it can limit the rotation angle of the protective cover 3, preventing the protective cover 3 from rotating excessively beyond its range. The worm 11 transmits power to the semi-worm gear 10 through meshing transmission, which in turn causes the semi-worm gear 10 to drive the rotating rod 9 and the protective cover 3 to rotate. The meshing transmission between the worm 11 and the semi-worm gear 10 has the characteristics of stable transmission ratio and good self-locking, which can ensure that the protective cover 3 can stay stably in any open or closed position, preventing the protective cover 3 from moving on its own due to external force. The upper surface of the base plate 2 is equipped with a shearing machine assembly 5. The shearing machine assembly 5 is an existing mature product technology, which will not be described in detail here. The shearing machine assembly 5 has a strong shearing force and can cut the feed The shearing assembly 5 efficiently shears scrap steel, cutting large pieces into smaller pieces that meet the requirements for subsequent processing or recycling. The shearing assembly 5 is located inside two protective covers 3. A feeding support plate 6 is installed at the feed inlet of the shearing assembly 5. The feeding support plate 6 carries the scrap steel to be sheared, providing a stable placement and conveying platform. A connecting rod 12 is fixedly connected to the lower surface of the feeding support plate 6, with its lower end fixedly connected to the upper surface of the base plate 2. The connecting rod 12 supports the feeding support plate 6, stably fixing it to the upper surface of the base plate 2, ensuring positional matching between the feeding support plate 6 and the feed inlet of the shearing assembly 5, and ensuring accurate feeding of the scrap steel into the shearing assembly 5. Four receiving slots are provided on the upper surface of the feeding support plate 6.The receiving groove is used to avoid and limit the pallet 14 in the feeding structure 7, so that the pallet 14 can be embedded inside the feeding support plate 6. This does not affect the load-bearing capacity of the feeding support plate 6 on the scrap steel, but allows the pallet 14 to smoothly contact the scrap steel and move it. The feeding structure 7 is provided below the feeding support plate 6. The feeding structure 7 gradually pushes the scrap steel on the feeding support plate 6 to the feed inlet of the shearing machine assembly 5, providing a continuous and stable material supply for the shearing operation and improving the shearing efficiency. The feeding structure 7 includes a support frame 13 and a pallet 14. 4. The sliding plate 15 and the lifting electric cylinder 16 are provided. A groove is formed on the upper surface of the support frame 13, and the feeding bearing plate 6 is located above the groove. The groove is used to avoid collisions between the support frame 13 and the feeding bearing plate 6 during vertical or horizontal movement, ensuring the smooth movement of the feeding structure 7. Four support plates 14 are fixedly connected to the upper surface of the support frame 13. The four support plates 14 are located inside four receiving slots on the upper surface of the feeding bearing plate 6, and the support plates 14 can slide inside the receiving slots. The function of the support plate 14 is to directly contact the scrap steel material. Under the action of the lifting electric cylinder 16, it is lifted upward, lifting the scrap steel from the feeding support plate 6. Then, driven by the sliding plate 15, it moves horizontally, pushing the scrap steel to the feed inlet of the shearing machine assembly 5. At this time, the lifting electric cylinder 16 retracts, causing the support plate 14 to re-enter the receiving groove. The support plate 14 slides and resets inside the receiving groove, repeating the cycle to complete the feeding action. A sliding plate 15 is respectively installed at the lower ends of the support frame 13. Each surface is fixedly connected to a lifting electric cylinder 16. The upper surfaces of the two sliding plates 15 are respectively fixedly connected to the lower surfaces of both ends of the support frame 13 at the lifting electric cylinder 16. The support frame 13 is used to fix the support plate 14 and connect the lifting electric cylinder 16. The lifting electric cylinder 16 is electrically connected to an external power supply and an external control switch. The lifting electric cylinder 16 is controlled to extend and retract by the external control switch. The lifting electric cylinder 16 is existing technology and will not be described in detail here. The specific model of the lifting electric cylinder 16 can be selected according to actual usage requirements.

[0021] In the specific implementation process, two fixing plates 17 are fixedly connected to the upper surface of the base plate 2, and a push electric cylinder 18 is set between the two fixing plates 17. The push electric cylinder 18 is fixedly connected to the upper surface of the base plate 2 and is electrically connected to an external power supply and an external control switch. The push electric cylinder 18 is pushed out and retracted by the external control switch. The push electric cylinder 18 is existing technology and will not be described in detail here. The specific model of the push electric cylinder 18 can be selected according to the actual use requirements. Two sliding rods 19 are set between the two fixing plates 17. The two ends of the two sliding rods 19 are respectively fixedly connected to the opposite side of the two fixing plates 17. The two fixing plates 17 are used to fix the sliding rods 19.

[0022] Two first ear plates 20 and two second ear plates 21 are fixedly connected to the upper surfaces of the two baffles 8 respectively. The side surfaces of the two first ear plates 20 and the two second ear plates 21 are provided with through holes. The first ear plate 20 is used to rotatably install the rotating rod 9, and the second ear plate 21 is used to rotatably install the worm gear 11.

[0023] The rotating rod 9 is rotatably connected at both ends to the through holes on the side surfaces of the two first ear plates 20, and the worm gear 11 is rotatably connected at both ends to the through holes on the side surfaces of the two second ear plates 21. A servo motor 22 is installed at one end of the worm gear 11, and the power output end of the servo motor 22 is fixedly connected to one end of the worm gear 11. The servo motor 22 is fixedly connected to the upper surface of the baffle 8. The servo motor 22 is electrically connected to an external power supply and an external control switch. The forward and reverse rotation of the power output end of the servo motor 22 is controlled by the external control switch. The servo motor 22 is existing technology and will not be described in detail here. The specific model of the servo motor 22 can be selected according to the actual use requirements. When the servo motor 22 is started, the power output end of the servo motor 22 rotates and drives the worm gear 11 to rotate.

[0024] Each of the four pallets 14 has a rubber anti-slip pad 23 fixedly connected to its upper surface. The rubber anti-slip pad 23 has anti-slip grooves on its upper surface. The rubber anti-slip pad 23 has good friction, which can increase the friction between the pallet 14 and the scrap steel material, and prevent the scrap steel from sliding during the process of the pallet 14 lifting and transporting the scrap steel. This ensures that the scrap steel can move synchronously with the pallet 14. The anti-slip grooves can further enhance the anti-slip effect.

[0025] Both ends of the two sliding plates 15 are provided with through holes, and two sliding rods 19 are respectively slidably inserted into the through holes at both ends of the two sliding plates 15. The sliding rods 19 play a guiding and limiting role, limiting the movement direction of the sliding plates 15, ensuring that the sliding plates 15 always move along the preset horizontal direction, avoiding the sliding plates 15 from deviating or shaking during the movement, and ensuring the stability of the horizontal conveying action of the feeding structure 7. The top end of the push electric cylinder 18 is fixedly connected to the outer surface of one of the sliding plates 15. When the push electric cylinder 18 is working, its piston rod extension and retraction can directly push the sliding plate 15 to move or reset along the sliding rod 19. Since the two sliding plates 15 are indirectly connected through components such as the support frame 13, the other sliding plate 15 can be driven to move and reset synchronously.

[0026] The working principle of this utility model is as follows: First, the operator moves the entire shearing device by controlling the tracked chassis 1 according to the location of the scrap steel pile. The tracked chassis 1 serves as a mobile support base, driving the device to move freely within the scrap steel site until the device reaches a suitable working position. At this point, the tracked chassis 1 stops moving, providing stable support for subsequent operations. Next, the servo motor 22 is started by an external control switch. The power output end of the servo motor 22 rotates, driving the worm gear 11 fixedly connected to it to rotate. The rotational motion of the worm gear 11 is converted into the rotational motion of the half-worm wheel 10, which in turn drives the rotating rod 9 to rotate synchronously. The rotation of the rotating rod 9 directly drives the protective cover 3 to rotate around the rotating rod 9 until the protective cover 3 rotates to the closed state. At this point, the servo motor 22 is turned off. The servo motor 22 and protective cover 3 prevent scrap from splashing during subsequent shearing operations. Then, the scrap steel to be sheared is placed on the feeding support plate 6. At this point, the feeding structure 7 is activated. First, the lifting electric cylinder 16 is pushed out via an external control switch. The lifting electric cylinder 16 pushes out, causing the support frame 13 to move upwards. The upward movement of the support frame 13 causes the pallet 14 to move upwards simultaneously. The rubber anti-slip pad 23 fixed on the upper surface of the pallet 14 contacts the scrap steel. The friction and anti-slip grooves of the rubber anti-slip pad 23 prevent the scrap steel from sliding. The pallet 14 continues to lift upwards, lifting the scrap steel from the feeding support plate 6. Next, the pushing electric cylinder 18 is activated via an external control switch. The pushing electric cylinder 18's ejector end is fixedly connected to the outer surface of one of the sliding plates 15. Simultaneously, the two sliding plates 15 slide through the through holes at both ends and are respectively inserted into the two sliding rods 19. The piston rod of the push electric cylinder 18 pushes out and pushes the connected sliding plate 15 to move horizontally along the sliding rod 19. Since the two sliding plates 15 are indirectly connected through the support frame 13, the other sliding plate 15 is driven to move horizontally along the sliding rod 19 in sync. The movement of the sliding plate 15 drives the upper lifting electric cylinder 16, support frame 13 and support plate 14 to move horizontally in sync. The support plate 14 drives the scrap steel it lifts to move towards the feed port of the shearing machine assembly 5. When the scrap steel moves to the appropriate position at the feed port of the shearing machine assembly 5, the lifting electric cylinder 16 is retracted by the external control switch. The retraction of the lifting electric cylinder 16 drives the support frame 13 to move downward, which in turn drives the support plate 14 to move downward. The scrap steel falls into the feed inlet of the shearing assembly 5 until the pallet 14 is re-embedded into the receiving groove of the feeding bearing plate 6. Then, the push electric cylinder 18 retracts via an external control switch. The retraction of the push electric cylinder 18 causes the sliding plate 15 to move in the opposite direction along the slide rod 19 to reset. The sliding plate 15 then drives the lifting electric cylinder 16, support frame 13, and pallet 14 to reset synchronously, completing one feeding action. This cycle repeats continuously, with the feeding structure 7 continuously pushing the scrap steel on the feeding bearing plate 6 to the feed inlet of the shearing assembly 5. Once the scrap steel enters the shearing assembly 5, the shearing assembly 5 starts, utilizing its powerful shearing force to efficiently shear the scrap steel, cutting large pieces into smaller pieces that meet the requirements for subsequent processing or recycling. During the shearing process...The closed protective cover 3 effectively blocks the splashing of waste material generated during shearing, protecting the operator's safety. After the shearing operation is completed, the servo motor 22 is restarted via an external control switch, causing the power output end of the servo motor 22 to rotate in the reverse direction, driving the worm gear 11 to rotate in the reverse direction. This, in turn, drives the protective cover 3 to rotate in the reverse direction through the half-worm gear 10 and the rotating rod 9, until the protective cover 3 is unfolded to a suitable angle. The servo motor 22 is then turned off, and the protective cover 3 comes to a stable stop, facilitating the discharge of small pieces of waste material from the device. If it is necessary to shear scrap steel in other locations, the tracked chassis 1 can be moved again, repeating the entire workflow to achieve efficient shearing of scrap steel in different locations.

[0027] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-efficiency scrap shearing device for a tracked shearing machine, comprising a tracked chassis (1), a base plate (2), a shearing machine assembly (5), a feeding bearing plate (6), a feeding structure (7), a protective cover (3), and an unfolding structure (4), characterized in that, A base plate (2) is installed on the top of the tracked chassis (1). A baffle (8) is fixedly connected to both sides of one end of the base plate (2). A protective cover (3) is set on the top of the two baffles (8). An unfolding structure (4) is set below the two protective covers (3). The unfolding structure (4) includes a rotating rod (9), a half worm gear (10), and a worm (11). The rotating rod (9) is fixedly connected to the lower surface of the protective cover (3). The half worm gear (10) is fixedly connected to the middle of the rotating rod (9). The worm (11) is meshed below the half worm gear (10). A shearing machine assembly (5) is installed on the upper surface of the base plate (2). The shearing machine assembly (5) is located inside the two protective covers (3). A feeding bearing plate (6) is set at the feed inlet of the shearing machine assembly (5). A connecting rod (12) is fixedly connected to the lower surface of the feeding bearing plate (6). The lower end of the connecting rod (12) Fixedly connected to the upper surface of the base plate (2), the upper surface of the feeding bearing plate (6) has four receiving slots. The feeding structure (7) is provided below the feeding bearing plate (6). The feeding structure (7) includes a support frame (13), a support plate (14), a sliding plate (15) and a lifting electric cylinder (16). The upper surface of the support frame (13) has a groove. The feeding bearing plate (6) is located above the groove. The upper surface of the support frame (13) is fixedly connected to four support plates (14). The four support plates (14) are located inside the four receiving slots on the upper surface of the feeding bearing plate (6). A sliding plate (15) is provided below each end of the support frame (13). The upper surfaces of the two sliding plates (15) are fixedly connected to the lifting electric cylinder (16). The ejection ends of the lifting electric cylinder (16) on the upper surfaces of the two sliding plates (15) are fixedly connected to the lower surfaces of both ends of the support frame (13).

2. The high-efficiency scrap shearing device for a tracked shearing machine according to claim 1, characterized in that, Two fixed plates (17) are fixedly connected to the upper surface of the base plate (2). A push electric cylinder (18) is provided between the two fixed plates (17). The push electric cylinder (18) is fixedly connected to the upper surface of the base plate (2). Two sliding rods (19) are provided between the two fixed plates (17). The two ends of the two sliding rods (19) are respectively fixedly connected to the opposite side of the two fixed plates (17).

3. The high-efficiency scrap shearing device for a tracked shearing machine according to claim 1, characterized in that, Two first ear plates (20) and two second ear plates (21) are fixedly connected to the upper surfaces of the two baffles (8), and through holes are opened on the side surfaces of the two first ear plates (20) and the two second ear plates (21).

4. The high-efficiency scrap shearing device for a tracked shearing machine according to claim 1, characterized in that, The two ends of the rotating rod (9) are respectively rotatably connected to the inside of the through holes on the side surface of the two first ear plates (20), and the two ends of the worm (11) are respectively rotatably connected to the inside of the through holes on the side surface of the two second ear plates (21). A servo motor (22) is provided at one end of the worm (11), and the power output end of the servo motor (22) is fixedly connected to one end of the worm (11). The servo motor (22) is fixedly connected to the upper surface of the baffle (8).

5. The high-efficiency scrap shearing device for a tracked shearing machine according to claim 1, characterized in that, The upper surfaces of the four trays (14) are all fixedly connected with rubber anti-slip pads (23), and anti-slip grooves are provided on the upper surface of the rubber anti-slip pads (23).

6. The high-efficiency scrap shearing device for a tracked shearing machine according to claim 1, characterized in that, Both ends of the two sliding plates (15) are provided with through holes, and two sliding rods (19) are respectively slidably inserted into the through holes at both ends of the two sliding plates (15). The push electric cylinder (18) is fixedly connected to the outer surface of one of the sliding plates (15).

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