Material mixing and recycling device

Abstract

The invention relates to the technical field of waste catalyst treatment, in particular to a material mixing and recycling device which comprises a mixing and recycling machine and a material frame, an ascending conveyor used for ascending and conveying a catalyst to the feeding end of the mixing and recycling machine is arranged on the front side of the mixing and recycling machine, and a conveying frame is arranged above a frame of the ascending conveyor. A conveying mechanism used for conveying a material frame is arranged on the conveying frame, a pouring opening is formed in the rear side of the conveying frame relative to the position above the lifting conveyor, a supporting frame is fixedly connected to the top end of the conveying frame relative to the position above the pouring opening, an electric telescopic cylinder is fixedly connected to the top end of the supporting frame, and a lifting plate is arranged on the inner side of the supporting frame. Through the arrangement of the structure, a catalyst in the material frame on the conveying line can be automatically discharged to the ascending conveyor, then the catalyst is automatically discharged into the discharging hopper of the mixing recycling machine under conveying of the ascending conveyor, manual carrying is not needed in the whole process, the automation degree of operation is remarkably improved, and manual intervention is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste catalyst treatment, and particularly relates to a material mixing and recycling device. Background Art

[0002] During the use of petroleum waste catalysts, they will become deactivated due to carbon deposition. The carbon deposition will block the catalyst pores and reduce its activity and selectivity. Therefore, decarbonization treatment is an important step in catalyst regeneration. With the improvement of environmental protection requirements and the intensification of resource shortage problems, the decarbonization treatment technology for petroleum waste catalysts has broad application prospects. In particular, green technologies such as microwave heating will play an important role in the future waste treatment field.

[0003] In the prior art, a method for treating copper-cobalt-nickel-containing waste catalysts and its homogenization device with the publication number of CN119368547A can avoid the long-term manual feeding work when the waste catalysts are put into the equipment, saving time and effort. During the spraying process, the water absorption of the waste catalysts is more uniform, improving the work efficiency. The impurities remaining in the waste catalysts during the treatment process can be filtered to avoid secondary pollution caused by the discharged used water, thus achieving the best use effect.

[0004] Although the above device can avoid the drawback of long-term manual on-site feeding by setting a feeding bin, there are still some defects in the actual use process. With the development of industrial automation, the material mixing and recycling device has an increasing demand for intelligence and automation. In the prior art, although some devices can achieve a certain degree of automation through sensors and control systems, manual intervention is still required in the pouring process, which limits the overall efficiency of the device.

[0005] Therefore, a material mixing and recycling device is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to propose a material mixing and recycling device to solve the drawbacks existing in the background art.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A material mixing and recycling device includes a mixing and recycling machine and a material box. In front of the mixing and recycling machine, there is a rising conveyor for conveying the catalyst upward to the feeding end of the mixing and recycling machine. Above the frame of the rising conveyor, there is a conveying box. On the conveying box, there is a conveying mechanism for conveying the material box. At the rear side of the conveying box, relative to the position above the rising conveyor, there is a pouring opening. At the top of the conveying box, relative to the position above the pouring opening, there is a support frame fixedly connected. At the top of the support frame, there is an electric telescopic cylinder fixedly connected. Inside the support frame, there is a lifting plate. At the bottom end of the lifting plate, there is a sliding plate longitudinally slidably connected. The output end of the electric telescopic cylinder passes through the top of the support frame and is fixedly connected to the top of the lifting plate. At the bottom rear side of the material box, there is a discharging opening. Inside the discharging opening, there is a blocking plate. Below the sliding plate, there are a pair of releasing rods. On the material box, there is a discharging mechanism for moving the releasing rods downward to open the discharging opening.

[0008] In the above technical solution, further, the pouring opening is inclined backward. Relative to the position beside the pouring opening at the top of the conveying box, there is an infrared sensor fixedly connected.

[0009] In the above technical solution, further, the discharging mechanism includes a pulling rope. Inside the material box, relative to the position above the discharging opening, there is an adjusting cavity. The blocking plate is slidably connected inside the adjusting cavity. Inside the adjusting cavity, there are a pair of guide rollers rotatably connected. There are a pair of pulling ropes. One end of each pulling rope is fixedly connected to the top of the blocking plate. On the side wall of the material box, there are a pair of sliding grooves, and the sliding grooves are communicated with the adjusting cavity. Inside each sliding groove, there is a bottom plate slidably connected. The other end of each pulling rope passes above the guide roller and is fixedly connected to the top of the bottom plate.

[0010] In the above technical solution, further, between the bottom end of each sliding groove and the bottom of the bottom plate, there is a return spring fixedly connected. Between the top end of the adjusting cavity and the top of the blocking plate, there are three blocking springs fixedly connected.

[0011] In the above technical solution, further, at both sides of the bottom of the lifting plate, there are lower plates fixedly connected. The bottom ends of the lower plates close to each other are inclined. At the rear side of the feeding end of the mixing and recycling machine, there is a baffle fixedly connected. The inner bottom end of the material box is inclined backward.

[0012] In the above technical solution, further, a pair of telescopic grooves are formed at the top end of the lifting plate. Telescopic blocks are fixedly connected to the top end of the sliding plate at positions corresponding to the inside of the telescopic grooves. Telescopic springs are fixedly connected between both ends of the inner side of the telescopic grooves and the outer walls of the telescopic blocks. A hinge groove is formed on the front side of the sliding plate. A push plate is rotatably connected to the inside of the hinge groove. A top groove is formed at the top end of the lifting plate. Side plates are fixedly connected to the top of the sliding plate at positions beside the hinge groove. An inclined plate is fixedly connected to the top end of the push plate in an inclined manner. A fixed frame is fixedly connected to the front side of the support frame. A number of right-angled blocks with inclined surfaces are fixedly connected to the inside of the fixed frame at equal intervals.

[0013] In the above technical solution, further, a return spring is fixedly connected between the inclined plate and the side plate, and the side end of the inclined plate is in contact with the side wall of the side plate. The side end of the push plate is set as a smooth arc surface, and the side end of the push plate is arranged above the right-angled block.

[0014] In the above technical solution, further, a pair of extrusion cylinders are fixedly connected to the bottom end of the lifting plate. The release rods are all slidably connected to the inside of the extrusion cylinders. Positioning plates are fixedly connected to the top ends of the release rods at positions corresponding to the inside of the extrusion cylinders. An extrusion spring is fixedly connected between the top end of the positioning plate and the inner top end of the extrusion cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the arrangement of structures such as the electric telescopic cylinder, the discharge port, the sealing plate, and the discharging mechanism, the present invention can automatically discharge the catalyst in the material frame on the conveyor line onto the rising conveyor, and then, under the conveyance of the rising conveyor, automatically discharge the catalyst into the discharge hopper of the mixing and recycling machine. The whole process does not require manual handling, significantly improving the automation degree of the operation and reducing manual intervention.

[0016] 2. Through the arrangement of structures such as the push plate, the right-angled block, and the extrusion cylinder, the present invention can automatically shake the material frame during the discharging process, effectively preventing the catalyst from caking due to extrusion or accumulation in the frame, ensuring the uniformity and fluidity of the catalyst particles, thereby improving the discharging efficiency and quality of the catalyst. The automatic shaking function further reduces the need for manual intervention. The operator does not need to manually intervene in the state of the catalyst in the material frame, further improving the automation degree and operation convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front three-dimensional structural schematic diagram of the mixing and recycling device of the present invention; Figure 2 is a side three-dimensional structural schematic diagram of the mixing and recycling device of the present invention; Figure 3 is an attached Figure 2 partial enlarged structural schematic diagram at A in the figure; Figure 4 Schematic diagram of the fully-sectioned three-dimensional structure of the side of the support frame of the present invention; Figure 5 For the attachment of the present invention Figure 4 Schematic diagram of the partially enlarged structure at position B in the figure; Figure 6 Schematic diagram of the top-down three-dimensional structure of the lifting plate and the sliding plate of the present invention; Figure 7 Schematic diagram of the fully-sectioned three-dimensional structure of the rear view of the material box of the present invention; Figure 8 Schematic diagram of the fully-sectioned three-dimensional structure of the front view of the extrusion cylinder of the present invention.

[0018] In the figure: 1, mixing and recycling machine; 2, rising conveyor; 3, conveying frame; 4, material box; 5, conveying mechanism; 6, discharging port; 7, support frame; 8, electric telescopic cylinder; 9, lifting plate; 10, sliding plate; 11, discharging opening; 12, releasing rod; 13, blocking plate; 14, infrared sensor; 15, adjusting cavity; 16, pulling rope; 17, guide roller; 18, bottom plate; 19, blocking spring; 20, telescopic groove; 21, telescopic block; 22, telescopic spring; 23, pushing plate; 24, side plate; 25, inclined plate; 26, reset spring; 27, fixed frame; 28, right-angle block; 29, hinge groove; 30, top groove; 31, sliding groove; 32, return spring; 33, lower plate; 34, extrusion cylinder; 35, positioning plate; 36, extrusion spring; 37, baffle. Detailed implementation manners

[0019] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0020] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the limitations of the specific embodiments disclosed below.

[0021] Such as Figures 1-8A material mixing and recycling device shown in the figure includes a mixing and recycling machine 1 and a material box 4. The working principle of the mixing and recycling machine 1 is to first crush the waste catalyst into smaller particles and make them evenly distributed through mixing for subsequent recycling or reuse. This is a mature technology in the prior art and will not be described in detail here. There is an upward conveyor 2 in front of the mixing and recycling machine 1 for transporting the catalyst upward to the feeding end of the mixing and recycling machine 1. Above the frame of the upward conveyor 2, there is a conveying frame 3. On the conveying frame 3, there is a conveying mechanism 5 for conveying the material box 4. The conveying mechanism 5 is mainly composed of structures such as a motor, conveying rollers, and a conveyor belt, which is a mature technology in the prior art and will not be described in detail here. A pouring port 6 is opened at the rear side of the conveying frame 3 relative to the upper position of the upward conveyor 2. At the top of the conveying frame 3 relative to the upper position of the pouring port 6, there is a fixed support frame 7. At the top of the support frame 7, there is a fixed electric telescopic cylinder 8. Inside the support frame 7, there is a lifting plate 9. The bottom end of the lifting plate 9 is longitudinally slidably connected with a sliding plate 10. The output end of the electric telescopic cylinder 8 passes through the top of the support frame 7 and is fixedly connected to the top of the lifting plate 9. At the bottom rear side of the material box 4, there is a discharge port 11. Inside the discharge port 11, there is a sealing plate 13. Below the sliding plate 10, there is a pair of release rods 12. On the material box 4, there is a discharging mechanism for moving the release rods 12 downward to open the discharge port 11; The discharging mechanism includes a pulling rope 16. Inside the material box 4, a regulating cavity 15 is opened at a position above the discharge port 11. The sealing plate 13 is slidably connected to the inside of the regulating cavity 15. Inside the regulating cavity 15, a pair of guide rollers 17 are rotatably connected to play a guiding role in the sliding of the pulling rope 16. There are a pair of pulling ropes 16. One end of each pulling rope 16 is fixedly connected to the top of the sealing plate 13. On the side wall of the material box 4, there are a pair of sliding grooves 31, and the sliding grooves 31 communicate with the regulating cavity 15. Inside each sliding groove 31, there is a bottom plate 18 slidably connected. The other ends of the pulling ropes 16 both pass above the guide rollers 17 and are fixedly connected to the top of the bottom plate 18; Between the bottom ends of the sliding grooves 31 and the bottoms of the bottom plates 18, return springs 32 are fixedly connected. Between the top ends of the regulating cavity 15 and the top of the sealing plate 13, three sealing springs 19 are fixedly connected. Through the positions of the return springs 32 and the sealing springs 19, when the release rods 12 are reset to release the extrusion of the bottom plates 18, it is convenient to quickly push the bottom plates 18 and the sealing plates 13 for resetting. At both sides of the bottom of the lifting plate 9, there are fixedly connected lower plates 33. The bottom ends of the lower plates 33 close to each other are inclined. When there is a deviation between the outer wall of the material box 4 and the inner side of the lower plates 33 (the deviation angle is not too large and the phenomenon that one of the lower plates 33 inserts into the material box 4 will not occur), the inclined surface at the bottom end of the lower plates 33 is used to squeeze the material box 4 to a specified position to ensure the normal operation of the subsequent shaking function; In the process of treating waste catalysts, first, a forklift with a clamping machine places the material box 4 with waste catalysts on the conveyor belt of the conveying mechanism 5. Subsequently, under the conveyance of the conveying mechanism 5, the material box 4 is conveyed to the lower part of the support frame 7. Then, the electric telescopic cylinder 8 can be controlled to start, driving the lifting plate 9 to slide downward and driving the sliding plate 10 to move downward. In this process, the lower plate 33 will first be inserted into the front and rear sides of the material box 4. Then, the release rod 12 moves above the bottom plate 18. Subsequently, the bottom plate 18 is pushed downward by the release rod 12, gradually compressing the return spring 32 and driving the pull rope 16 to move downward. Furthermore, under the guidance of the guide roller 17, the pull rope 16 will pull the sealing plate 13 upward, compressing the sealing spring 19 at the same time, thereby opening the discharge port 11. Then, the waste catalysts in the material box 4 are discharged from the discharge port 11 under their own gravity and fall onto the rising conveyor 2 below. Subsequently, under the conveyance of the rising conveyor 2, the waste catalysts are transferred to the feed hopper of the mixing and recycling machine 1. Finally, after the waste catalysts in the material box 4 are completely discharged, the electric telescopic cylinder 8 is controlled to reset and repeat the above operations in reverse, thus realizing the automatic feeding of waste catalysts. The whole process does not require manual handling, significantly improving the automation degree of the operation and reducing manual intervention.

[0022] To improve the convenience performance during the operation of the device, the pouring port 6 is inclined backward, facilitating the discharge of the waste catalysts falling on the pouring port 6. The top end of the conveying frame 3 is fixedly connected to an infrared sensor 14 relative to the position beside the pouring port 6. Here, it should be noted that the infrared sensor 14 is electrically connected to the conveying mechanism 5 through a controller. When the conveying mechanism 5 conveys the material box 4 and the material box 4 is completely transferred beside the pouring port 6, the infrared sensor 14 will detect the removal of the material box 4 and then transmit the signal to the controller. The controller controls the conveying mechanism 5 to stop operating, thus ensuring that the material box 4 is accurately conveyed to the pouring port 6 without manual operation and improving the automation efficiency of the device. A baffle 37 is fixedly connected to the rear side of the feed end of the mixing and recycling machine 1. Through the setting of the baffle 37, when the rising conveyor 2 conveys the waste catalysts into the feeding hopper of the mixing and recycling machine 1, it plays a role in blocking the materials, preventing the waste catalysts from falling to the ground. The inner bottom end of the material box 4 is inclined backward, facilitating the rapid discharge of the waste catalysts in the material box 4 from the discharge port 11 when the discharge port 11 is opened.

[0023] In order to be able to automatically vibrate the material box 4 during the nesting process, a pair of telescopic grooves 20 are provided at the top of the lifting plate 9. At positions corresponding to the telescopic grooves 20 inside the top of the sliding plate 10, telescopic blocks 21 are fixedly connected. Between the two ends of the inner side of the telescopic groove 20 and the outer wall of the telescopic block 21, telescopic springs 22 are fixedly connected. A hinge groove 29 is provided on the front side of the sliding plate 10, and a push plate 23 is rotatably connected inside the hinge groove 29. A top groove 30 is provided at the top of the lifting plate 9. At a position beside the hinge groove 29 on the top of the sliding plate 10, a side plate 24 is fixedly connected. An inclined plate 25 is fixedly connected to the top of the push plate 23 in an inclined manner. A fixed frame 27 is fixedly connected to the front side of the support frame 7, and a number of right-angled blocks 28 with inclined surfaces are fixedly connected at equal intervals inside the fixed frame 27; A return spring 26 is fixedly connected between the inclined plate 25 and the side plate 24. Through the setting of the return spring 26, it is convenient to pull the inclined plate 25 and the push plate 23 to quickly flip and reset. And the side end of the inclined plate 25 is in contact with the side wall of the side plate 24. The side end of the push plate 23 is set as a smooth arc surface, which is convenient for the inclined surface of the right-angled block 28 to more smoothly squeeze the push plate 23 to move. The side end of the push plate 23 is set at a position above the right-angled block 28; A pair of extrusion cylinders 34 are fixedly connected to the bottom end of the lifting plate 9. The release rods 12 are all slidably connected inside the extrusion cylinders 34. At positions corresponding to the inside of the extrusion cylinders 34 at the top of the release rods 12, positioning plates 35 are fixedly connected. Between the top of the positioning plate 35 and the inner top of the extrusion cylinder 34, extrusion springs 36 are fixedly connected (it should be noted here that the elastic force of the extrusion spring 36 needs to be greater than the elastic forces of the return spring 32 and the plugging spring 19, so that the release rod 12 can push the bottom plate 18 and quickly release the plugging of the discharge port 11); When the electric telescopic cylinder 8 is started to open the discharge port 11, the push plate 23 on the front side of the sliding plate 10 will move above the right-angled block 28. At this time, the release rod 12 squeezes the bottom plate 18 to the bottom end of the sliding groove 31. Subsequently, during the discharge process of the waste catalyst in the material box 4, the electric telescopic cylinder 8 can be controlled to start and continue to move downward, thereby driving the lifting plate 9 and the sliding plate 10 to continue to move downward. At the same time, since the release rod 12 is squeezing on the bottom plate 18 and the bottom plate 18 is located at the bottom end of the sliding groove 31, the bottom plate 18 cannot continue to move downward, so the extrusion spring 36 will be gradually compressed, causing the release rod 12 to slide inside the extrusion cylinder 34. Meanwhile, through the continuous downward movement of the sliding plate 10, the push plate 23 in the hinge groove 29 will be driven to move above the right-angled block 28, and then the inclined surface of the right-angled block 28 will squeeze the push plate 23 to move backward (since the top of the push plate 23 is restricted by the inclined plate 25 and cannot flip upward, when the push plate 23 moves onto the inclined surface of the right-angled block 28, it will be squeezed backward by the inclined surface of the right-angled block 28), and at this time the lower plate 33 is inserted into the front and rear sides of the material box 4; Therefore, it will drive the material frame 4 to move backward. At the same time, it will drive the telescopic block 21 to move in the telescopic groove 20, and stretch and compress the telescopic spring 22. Subsequently, when the push plate 23 slides out from the inclined surface of the right-angle block 28, the extrusion on the push plate 23 will be released. Then, under the elastic force of the telescopic spring 22, the telescopic block 21 will be pushed and pulled to reset, thereby driving the sliding plate 10, the lower plate 33 and the material frame 4 to quickly move back to their original positions, and thus realizing the shaking function of the material frame 4. At this time, the electric telescopic cylinder 8 can be operated regularly to move downward to drive the push plate 23 to pass through the right-angle block 28, so that the material frame 4 can be shaken multiple times, effectively preventing the catalyst from caking due to extrusion or accumulation in the frame, ensuring the uniformity and fluidity of the catalyst particles, thereby improving the emission efficiency and quality of the catalyst. Finally, after the discharge of the waste catalyst is completed, when controlling the electric telescopic cylinder 8 to reset, it will drive the push plate 23 to move upward through the right-angle block 28. Then, under the extrusion of the right-angle block 28, the push plate 23 will be extruded to turn downward around the hinge (the bottom end of the push plate 23 is not restricted, so it can turn downward), and at the same time, the inclined plate 25 will be driven to turn and the return spring 26 will be pulled. Subsequently, when the push plate 23 moves away from the right-angle block 28, the inclined plate 25 and the push plate 23 will be pulled to reset under the elastic force of the return spring 26.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention.

[0025] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A material mixing and recycling device, comprising a mixing and recycling machine (1) and a material frame (4), characterized in that: The front side of the mixing and recycling machine (1) is provided with an ascending conveyor (2) for ascending and conveying the catalyst to the feed end of the mixing and recycling machine (1); a conveying frame (3) is provided above the frame of the ascending conveyor (2); a conveying mechanism (5) for conveying a material frame (4) is provided on the conveying frame (3); a discharge port (6) is provided on the rear side of the conveying frame (3) at a position above the ascending conveyor (2); a support frame (7) is fixedly connected to the top of the conveying frame (3) at a position above the discharge port (6); and an electric telescopic A cylinder (8) is provided on the inner side of the support frame (7), a lifting plate (9) is longitudinally slidably connected to the bottom end of the lifting plate (9) with a slide plate (10), an output end of the electric telescopic cylinder (8) passes through the top end of the support frame (7) and is fixedly connected to the top end of the lifting plate (9), a discharge port (11) is provided at the bottom end of the rear side of the material frame (4), a blocking plate (13) is provided in the discharge port (11), a pair of release rods (12) are provided below the slide plate (10), and a discharge mechanism for moving the release rods (12) downward to open the discharge port (11) is provided on the material frame (4).

2. A material mixing and recovery device according to claim 1, characterized in that: The pouring port (6) is arranged to be inclined toward the rear side, and an infrared sensor (14) is fixedly connected to the top end of the conveying frame (3) at a position next to the pouring port (6).

3. A material mixing and recovery device according to claim 1, characterized in that: The discharge mechanism comprises a pull rope (16); an adjustment chamber (15) is provided inside the material frame (4) at a position above the discharge port (11); the blocking plate (13) is slidably connected to the inside of the adjustment chamber (15); a pair of guide rollers (17) are rotatably connected to the inside of the adjustment chamber (15); a pair of pull ropes (16) are provided, one end of the pull rope (16) is fixedly connected to the top of the blocking plate (13); a pair of chute (31) is provided on the side wall of the material frame (4); the chute (31) is communicated with the adjustment chamber (15); a bottom plate (18) is slidably connected to the inside of the chute (31); the other end of the pull rope (16) passes through the top of the guide roller (17) and is fixedly connected to the top of the bottom plate (18).

4. A material mixing recovery device according to claim 3, characterized in that: A return spring (32) is fixedly connected between the bottom end of the slide groove (31) and the bottom of the bottom plate (18), and three blocking springs (19) are fixedly connected between the top end of the adjustment cavity (15) and the top end of the blocking plate (13).

5. A material mixing recovery device according to claim 1, characterized in that: The bottom of the lifting plate (9) is fixedly connected to lower plates (33) on both sides, and the bottom ends of the lower plates (33) on the sides close to each other are tilted. The rear side of the feed end of the mixing recovery machine (1) is fixedly connected to a baffle (37), and the inner bottom end of the material frame (4) is tilted toward the rear side.

6. A material mixing recovery device according to claim 1, characterized in that: A pair of telescopic grooves (20) are formed at the top of the lifting plate (9); a telescopic block (21) is fixedly connected to the top of the slide plate (10) relative to the inner position of the telescopic groove (20); telescopic springs (22) are fixedly connected between the inner ends of the telescopic groove (20) and the outer wall of the telescopic block (21); a hinge groove (29) is formed at the front side of the slide plate (10); a push plate (23) is rotatably connected to the inner side of the hinge groove (29); a top groove (30) is formed at the top of the lifting plate (9); a side plate (24) is fixedly connected to the top of the slide plate (10) relative to the position beside the hinge groove (29); a slanted plate (25) is fixedly connected to the top of the push plate (23); a fixed frame (27) is fixedly connected to the front side of the support frame (7); and a plurality of right-angle blocks (28) with inclined surfaces are fixedly connected to the inner side of the fixed frame (27) at equal intervals.

7. A material mixing recovery device according to claim 6, characterized in that: A return spring (26) is fixedly connected between the inclined plate (25) and the side plate (24), and the side end of the inclined plate (25) contacts the side wall of the side plate (24). The side end of the push plate (23) is arranged as a smooth arc surface, and the side end of the push plate (23) is arranged above the right-angle block (28).

8. A material mixing and recovery device according to claim 1, characterized in that: A pair of extrusion cylinders (34) are fixedly connected to the bottom end of the lifting plate (9), the release rods (12) are slidably connected to the inner side of the extrusion cylinder (34), the top ends of the release rods (12) are fixedly connected to positioning plates (35) relative to the inner side of the extrusion cylinder (34), and an extrusion spring (36) is fixedly connected between the top end of the positioning plate (35) and the inner top end of the extrusion cylinder (34).

Images