Automatic winding equipment for artificial graphite semi-finished product coiled material

Abstract

The utility model relates to the technical field of winding equipment, and discloses automatic winding equipment for an artificial graphite semi-finished product coiled material, which solves the problems that the existing winding equipment for the artificial graphite semi-finished product needs manual blanking and carrying after winding is completed, the manual blanking transfer is limited by the physiological function of people, the carrying speed is low, certain operation risks exist, and the winding efficiency is low. The device comprises a working table, two conveying belts are fixedly installed on one side of the working table, two first motors are fixedly installed on the lower surface of the working table, and first trays are fixedly installed at the output ends of the two first motors through differential mechanisms; discharging rods are fixedly mounted at the tops of the two first trays; according to the artificial graphite semi-finished product winding equipment, discharging can be rapidly conducted after winding is completed, manual carrying is not needed, and therefore the manual operation risk is reduced, and the very good using effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of winding equipment, specifically an automated winding equipment for semi-finished artificial graphite rolls. Background Technology

[0002] The automated winding equipment for semi-finished artificial graphite rolls is an automated device specifically designed for the winding process of semi-finished artificial graphite rolls. It can efficiently and accurately wind semi-finished artificial graphite rolls into rolls of specified specifications. Through an integrated automated control system, it can automatically complete operations such as roll traction, tension control, and winding forming, reducing manual intervention and improving production efficiency and product consistency. This equipment is widely used in fields such as electronics, new energy, and aerospace, for example, in the winding process of producing products such as smartphone heat dissipation films, lithium battery anode materials, and high thermal conductivity graphite sheets, meeting the high-precision and high-efficiency production requirements of these fields for artificial graphite rolls.

[0003] Existing artificial graphite semi-finished product winding equipment requires manual unloading and transportation after winding. Manual unloading and transportation is limited by human physiological functions, and its transportation speed is slow and has certain operational risks, which leads to a longer cycle of the entire production process and reduces the overall production efficiency. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides an automated winding equipment for semi-finished artificial graphite rolls, which effectively solves the problem that existing semi-finished artificial graphite winding equipment requires manual unloading and transportation after winding. Manual unloading and transportation is limited by human physiological functions, and its transportation speed is slow and has certain operational risks, which leads to the extension of the entire production process cycle.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automated winding device for semi-finished artificial graphite rolls, comprising a workbench, two conveyor belts fixedly installed on one side of the workbench, two first motors fixedly installed on the lower surface of the workbench, a first tray fixedly installed at the output end of each of the two first motors via a differential, and a feeding rod fixedly installed on the top of each of the two first trays, a second motor fixedly installed on one side of each of the two first motors and on the lower surface of the workbench, a second tray fixedly installed on the output shaft of each of the two second motors, a winding air shaft detachably installed on the top of each of the second trays, and a wound semi-finished roll body sleeved on the surface of each of the two winding air shafts, two meter counters fixedly installed on one side of the top of the workbench, a light grating alarm fixedly installed on one side of each of the two meter counters and on the upper surface of the workbench, and a PLC logic controller fixedly installed at one end of the top of the workbench;

[0006] A support frame is fixedly installed in the middle of one side of the workbench. A gear rail is fixedly installed in the upper part of the support frame. A transmission frame is fitted on the surface of the gear rail. A servo motor is fixedly installed in the lower part of one side of the transmission frame. A transmission component is provided at the output end of the servo motor. Clamping hoops are provided on both sides of the two second trays. Soft pads are fixedly installed on the inner side of the two clamping hoops. The transmission component is connected to the four clamping hoops. When the servo motor is running, it outputs power to the four clamping hoops through the transmission component, so that the four clamping hoops drive the wound semi-finished roll material to move onto the conveyor belt to achieve unloading.

[0007] Preferably, two mounting brackets are fixedly installed on the rear side of the top of the workbench. A drive motor is fixedly installed on the top of each of the two mounting brackets. The output ends of the two drive motors pass downward through the mounting brackets and are fixedly installed with threaded rods. The bottom ends of the two threaded rods are rotatably connected to the top of the workbench, and threaded sleeves are threadedly connected to the surface of the two threaded rods.

[0008] Preferably, a limiting strip is fixedly installed on one side of the threaded sleeve, and a limiting groove is opened on one side of each of the two mounting brackets. One end of each limiting strip is slidably installed inside the limiting groove.

[0009] Preferably, an electric push rod is fixedly installed on the other side of the threaded sleeve, a connecting strip is fixedly installed on the transmission end of each of the two electric push rods, a material support wheel is rotatably installed on the lower part of one end of each of the two connecting strips, the material support wheel is made of silicone material, and photoelectric beam sensors are installed on the upper part of one end of each of the two connecting strips and the top of each of the two feeding rods.

[0010] Preferably, the transmission assembly includes a lower gear column, which is fixedly installed at the output end of the servo motor and located in the lower part of the transmission frame. A lower shaft is fixedly installed at one end of the lower gear column, and a lower gear is fixedly installed at one end of the lower shaft. An upper gear is meshed with the upper part of the lower gear. An upper shaft is fixedly installed on one side of the upper gear, and an upper gear column is fixedly installed at one end of the upper shaft. One end of the upper gear column is rotatably connected to the inside of the transmission frame. The surfaces of the upper shaft and the lower shaft are rotatably connected to the other side of the transmission frame through bushings.

[0011] Preferably, sliders are fixedly installed on both inner walls of the transmission frame, and grooves are provided on both sides of the gear rail, with the two sliders slidably installed inside the two grooves.

[0012] Preferably, support columns are fixedly installed on both sides of the transmission frame via support arms. Slide rods are movably inserted into the surface of each support column. One end of each slide rod is fixedly connected to the support frame. Electric telescopic rods are fixedly installed at the bottom of each support column. Protective boxes are fixedly installed at the transmission ends of each electric telescopic rod. Hydraulic cylinders are fixedly installed at both ends of each protective box. The transmission ends of the four hydraulic cylinders extend into the interior of the two protective boxes and are respectively fixedly connected to the four clamping hoops.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. In use, the operator places the semi-finished roll material onto the feeding rod and inflates and secures the core onto the take-up air shaft. The material on the feeding rod is then pulled through the meter counter and adhered to the surface of the core sleeved on the take-up air shaft. The PLC logic controller then controls two first motors to drive the two feeding rods to rotate and unwind the roll via two first trays, and controls two second motors to drive the two take-up air shafts to rotate and rewind the roll via two second trays. The first and second trays prevent wear during the bottom winding process. During winding, the meter counter rotates its movable guide rollers as the roll material winds up, and the meter counter sensor records the length, reducing operator conversion time and improving efficiency. Simultaneously, a tension sensor on the movable guide rollers of the meter counter transmits tension data to the PLC logic controller in real time. The PLC logic controller then controls the speed of the first motors to ensure tension during the roll material winding process.

[0015] The photoelectric beam sensor automatically detects changes in the outer diameter of the material roll on the unloading rod and the rewinding air shaft. The sensor transmits this data to the PLC logic controller in real time. The PLC then controls the drive motor to rotate the threaded rod. This rotation, via the threaded sleeve, moves the electric push rod vertically. The vertical movement of the threaded sleeve causes the limit strip to slide along the inside of the limit groove, improving the stability of the threaded sleeve's movement. Simultaneously, the electric push rod's vertical movement drives the material support roller via the connecting strip. The PLC logic controller also controls the electric push rod to move the material support roller horizontally. This allows the material support roller to adjust its position according to changes in the outer diameter of the roll in real time, preventing the material from jumping or deviating during rewinding. The entire rewinding process requires no direct human intervention, resulting in a high degree of automation. A light grating alarm triggers a stop signal and provides audible and visual alarms when material runs out, allowing for timely material replacement.

[0016] 2. After the semi-finished roll body is wound up, the winding air shaft is released from the second tray. The PLC logic controller synchronously controls four hydraulic cylinders to drive four clamping clamps to clamp and fix the two semi-finished roll bodies. Then, the servo motor is controlled to drive the lower tooth column to rotate. The lower tooth column drives the lower gear to rotate through the lower shaft. When the lower gear rotates, it drives the upper shaft to rotate through the upper gear. When the upper shaft rotates, it drives the upper tooth column to rotate. When the upper and lower tooth columns rotate, they will drive the transmission frame to move along the toothed track. At the same time, the transmission frame will drive the two sliders to slide inside the two slide grooves, which increases the stability of the transmission frame during movement.

[0017] When the transmission frame moves, it drives two support columns via two support arms. As the support columns move, they extend the surface of the sliding rods, increasing stability during movement. The movement of the two support columns, via the protective box, drives four hydraulic cylinders and four clamping hoops, moving the two wound semi-finished rolls above the two conveyor belts. Then, two electric telescopic rods are activated to lower the two semi-finished rolls onto the conveyor belts. Subsequently, the four hydraulic cylinders are controlled to release the four clamping hoops, allowing the two semi-finished rolls to be transported away by the two conveyor belts, thus quickly completing the unloading and transfer. This allows the artificial graphite semi-finished product winding equipment to quickly unload after winding without manual handling, reducing operational risks and demonstrating excellent performance. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the structure of the automated winding equipment for semi-finished artificial graphite rolls according to this utility model. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the automated winding equipment for semi-finished artificial graphite rolls according to this utility model. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the structure of the automated winding equipment for semi-finished artificial graphite rolls according to this utility model. Figure 3 ;

[0023] Figure 4 This is a schematic diagram of the internal structure of the transmission frame of this utility model;

[0024] In the diagram: 1. Workbench; 2. Conveyor belt; 3. First pallet; 4. Feeding rod; 5. Second pallet; 6. Rewinding air shaft; 7. Meter counter; 8. First motor; 9. Differential; 10. Second motor; 11. Support frame; 12. Gear rail; 13. Transmission frame; 14. Servo motor; 15. Lower gear column; 16. Lower shaft; 17. Lower gear; 18. Upper gear; 19. Upper shaft; 20. Upper gear column; 21. Bushing; 22. Slider; 3. Slide rail; 24. Support arm; 25. Support column; 26. Slide rod; 27. Light grating alarm; 28. PLC logic controller; 29. ​​Mounting bracket; 30. Drive motor; 31. Threaded rod; 32. Threaded sleeve; 33. Limiting strip; 34. Limiting groove; 35. Electric push rod; 36. Connecting strip; 37. Material support wheel; 38. Protective box; 39. Hydraulic cylinder; 40. Clamping hoop; 41. Semi-finished roll body; 42. Electric telescopic rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Depend on Figures 1 to 4 The present invention includes a workbench 1, two conveyor belts 2 fixedly installed on one side of the workbench 1, two first motors 8 fixedly installed on the lower surface of the workbench 1, the output ends of the two first motors 8 are fixedly installed with first trays 3 through differentials 9, and the top of the two first trays 3 are fixedly installed with feeding rods 4. The two first motors 8 are fixedly installed on one side of the workbench 1 and on the lower surface of the workbench 1, the output shafts of the two second motors 10 are fixedly installed with second trays 5, the top of the second trays 5 are detachably installed with winding air shafts 6, the surfaces of the two winding air shafts 6 are covered with the wound semi-finished roll body 41, the top of the workbench 1 is fixedly installed with two meter counters 7 fixedly installed on one side of the top of the workbench 1, the top of the two meter counters 7 and on the upper surface of the workbench 1 are fixedly installed with light grid alarms 27, and the top of the workbench 1 is fixedly installed with a PLC logic controller 28.

[0027] A support frame 11 is fixedly installed in the middle of one side of the workbench 1. A gear rail 12 is fixedly installed in the upper part of the support frame 11. A transmission frame 13 is fitted on the surface of the gear rail 12. A servo motor 14 is fixedly installed in the lower part of one side of the transmission frame 13. A transmission component is provided at the output end of the servo motor 14. Clamping hoops 40 are provided on both sides of the two second trays 5. Soft pads are fixedly installed on the inner side of the two clamping hoops 40. The transmission component is connected to the four clamping hoops 40. When the servo motor 14 is running, it outputs power to the four clamping hoops 40 through the transmission component, so that the four clamping hoops 40 drive the wound semi-finished roll body 41 to move onto the conveyor belt 2 to realize unloading.

[0028] In use, the operator places the semi-finished roll material onto the feeding rod 4 and inflates and secures the core onto the take-up air shaft 6. The material on the feeding rod 4 is then pulled past the meter counter 7 and adhered to the surface of the core sleeved on the take-up air shaft 6. Then, the PLC logic controller 28 controls two first motors 8 to drive the two feeding rods 4 to rotate and unwind via two first trays 3, and controls two second motors 10 to drive the two take-up air shafts 6 to rotate and rewind via two second trays 5. The first trays 3 and second trays 5 prevent wear during the bottom winding process. During the winding process, the meter counter 7 rotates the movable guide roller on the meter counter 7 as the roll material is wound. The meter counter sensor records the length of the roll material, reducing the operator's conversion time and improving efficiency. At the same time, the tension sensor installed on the movable guide roller of the meter counter 7 can transmit the tension data to the PLC logic controller 28 in real time. The PLC logic controller 28 can control the speed of the first motor 8 to ensure the tension of the roll material during the winding process. The light grating alarm 27 can trigger a stop signal and sound and light alarm when the material is cut off, so that the material can be replaced in time.

[0029] After the two semi-finished roll bodies 41 are wound up, the winding air shaft 6 is released from the second tray 5, and the transmission components are synchronously controlled by the PLC logic controller 28 to clamp the two semi-finished roll bodies 41 tightly. The two wound semi-finished roll bodies 41 are then placed above the two conveyor belts 2, and the clamping of the two semi-finished roll bodies 41 is released. The two conveyor belts 2 then transport the two semi-finished roll bodies 41 away, thus quickly completing the unloading and transfer. This allows the artificial graphite semi-finished product winding equipment to quickly unload the material after winding without manual handling, thereby reducing the risk of manual operation and achieving very good results.

[0030] Two mounting brackets 29 are fixedly installed on the rear side of the top of the workbench 1. A drive motor 30 is fixedly installed on the top of each of the two mounting brackets 29. The output ends of the two drive motors 30 pass downward through the mounting brackets 29 and are fixedly installed with threaded rods 31. The bottom ends of the two threaded rods 31 are rotatably connected to the top of the workbench 1. Threaded sleeves 32 are threadedly connected to the surface of the two threaded rods 31. Limiting strips 33 are fixedly installed on one side of each threaded sleeve 32. Limiting grooves 34 are opened on one side of each of the two mounting brackets 29. One end of each limiting strip 33 is slidably installed inside the limiting groove 34.

[0031] Electric push rods 35 are fixedly installed on the other side of the threaded sleeve 32. Connecting bars 36 are fixedly installed on the transmission ends of the two electric push rods 35. Material support wheels 37 are rotatably installed on the lower part of one end of the two connecting bars 36. The material support wheels 37 are made of silicone material. Photoelectric beam sensors are installed on the upper part of one end of the two connecting bars 36 and the top of the two feeding rods 4.

[0032] The photoelectric beam sensor can automatically sense changes in the outer diameter of the material roll on the unloading rod 4 and the winding air shaft 6. The photoelectric beam sensor transmits the data to the PLC logic controller 28 in real time. The PLC logic controller 28 controls the drive motor 30 to drive the threaded rod 31 to rotate. When the threaded rod 31 rotates, it drives the electric push rod 35 to move vertically through the threaded sleeve 32. When the threaded sleeve 32 moves vertically, it drives the limit strip 33 to slide along the inside of the limit groove 34, which improves the stability of the threaded sleeve 32 when it moves. When the electric push rod 35 moves vertically, it drives the material support wheel 37 to move through the connecting strip 36. At the same time, the PLC logic controller 28 controls the electric push rod 35 to drive the material support wheel 37 to move horizontally. Thus, the material support wheel 37 can support the material in real time according to the change in the outer diameter of the roll, preventing the material from jumping or deviating during the winding process. The entire winding process does not require direct human intervention and has a high degree of automation.

[0033] The transmission assembly includes a lower gear 15, which is fixedly installed at the output end of the servo motor 14 and located in the lower part of the transmission frame 13. A lower shaft 16 is fixedly installed at one end of the lower gear 15, and a lower gear 17 is fixedly installed at one end of the lower shaft 16. An upper gear 18 is meshed with the upper part of the lower gear 17. An upper shaft 19 is fixedly installed on one side of the upper gear 18, and an upper gear 20 is fixedly installed at one end of the upper shaft 19. One end of the upper gear 20 is rotatably connected to the inside of the transmission frame 13. The surfaces of the upper shaft 19 and the lower shaft 16 are rotatably connected to the other side of the transmission frame 13 through bushings 21. Slider 22 is fixedly installed on both inner walls of the transmission frame 13. Slide grooves 23 are opened on both sides of the gear rail 12, and the two sliders 22 are slidably installed inside the two slide grooves 23.

[0034] Both sides of the transmission frame 13 are fixedly mounted with support columns 25 via support arms 24. Slide rods 26 are movably inserted into the surface of each support column 25. One end of each slide rod 26 is fixedly connected to the support frame 11. Electric telescopic rods 42 are fixedly mounted at the bottom of each support column 25. Protective boxes 38 are fixedly mounted at the transmission ends of each electric telescopic rod 42. Hydraulic cylinders 39 are fixedly mounted at both ends of each protective box 38. The transmission ends of the four hydraulic cylinders 39 extend into the interior of the two protective boxes 38 and are fixedly connected to the four clamping hoops 40 respectively.

[0035] After the semi-finished roll body 41 is wound up, the winding air shaft 6 is released from the second tray 5, and the four hydraulic cylinders 39 are synchronously controlled by the PLC logic controller 28 to drive the four clamping hoops 40 to clamp and fix the two semi-finished roll bodies 41. Since the clamping hoops 40 are equipped with soft pads, the roll body is not damaged during clamping. Then, the servo motor 14 is controlled to drive the lower tooth column 15 to rotate. The lower tooth column 15 drives the lower gear 17 to rotate through the lower shaft rod 16. When the lower gear 17 rotates, it drives the upper shaft rod 19 to rotate through the upper gear 18. When the upper shaft rod 19 rotates, it drives the upper tooth column 20 to rotate. When the upper tooth column 20 and the lower tooth column 15 rotate, they will drive the transmission frame 13 to move along the toothed track 12. At the same time, the transmission frame 13 will drive the two sliders 22 to slide inside the two slide grooves 23, which increases the stability of the transmission frame 13 when it moves.

[0036] When the transmission frame 13 moves, it drives the two support columns 25 to move through the two support arms 24. When the support columns 25 move, they extend the surface of the slide bar 26 to slide, which increases the stability of the two support columns 25 when they move. When the two support columns 25 move, they drive the four hydraulic cylinders 39 and the four clamping hoops 40 to move through the protective box 38, thereby moving the two wound semi-finished roll bodies 41 above the two conveyor belts 2. Then, the two electric telescopic rods 42 are activated to move the two semi-finished roll bodies 41 down onto the conveyor belts 2. Then, the four hydraulic cylinders 39 are controlled to drive the four clamping hoops 40 to release the two semi-finished roll bodies 41, thereby conveying the two semi-finished roll bodies 41 away through the two conveyor belts 2, thus quickly completing the unloading and transfer.

Claims

1. An automated winding device for semi-finished artificial graphite rolls, comprising a workbench (1), characterized in that: Two conveyor belts (2) are fixedly installed on one side of the workbench (1). Two first motors (8) are fixedly installed on the lower surface of the workbench (1). The output ends of the two first motors (8) are fixedly installed with first trays (3) through differentials (9). The tops of the two first trays (3) are fixedly installed with feeding rods (4). The two first motors (8) are fixedly installed on one side and on the lower surface of the workbench (1). The output shafts of the two second motors (10) are fixedly installed with second trays (5). The tops of the second trays (5) are detachably installed with winding air shafts (6). The surfaces of the two winding air shafts (6) are fitted with the semi-finished roll body (41) after winding. Two meter counters (7) are fixedly installed on one side of the top of the workbench (1). The two meter counters (7) are fixedly installed on one side and on the upper surface of the workbench (1). A grating alarm (27) is fixedly installed on one side of the top of the workbench (1). A PLC logic controller (28) is fixedly installed at one end of the top of the workbench (1). A support frame (11) is fixedly installed in the middle of one side of the workbench (1). A toothed rail (12) is fixedly installed in the upper part of the support frame (11). A transmission frame (13) is fitted on the surface of the toothed rail (12). A servo motor (14) is fixedly installed in the lower part of one side of the transmission frame (13). A transmission component is provided at the output end of the servo motor (14). Clamping hoops (40) are provided on both sides of the two second trays (5). A soft pad is fixedly installed on the inner side of the two clamping hoops (40). The transmission component is connected to the four clamping hoops (40). When the servo motor (14) is running, it outputs power to the four clamping hoops (40) through the transmission component, so that the four clamping hoops (40) drive the wound semi-finished roll body (41) to move onto the conveyor belt (2) to realize unloading.

2. The automated winding equipment for semi-finished artificial graphite rolls according to claim 1, characterized in that: Two mounting brackets (29) are fixedly installed on the rear side of the top of the workbench (1). A drive motor (30) is fixedly installed on the top of each of the two mounting brackets (29). The output ends of the two drive motors (30) pass downward through the mounting brackets (29) and are fixedly installed with threaded rods (31). The bottom ends of the two threaded rods (31) are rotatably connected to the top of the workbench (1). Threaded sleeves (32) are threadedly connected to the surfaces of the two threaded rods (31).

3. The automated winding equipment for semi-finished artificial graphite rolls according to claim 2, characterized in that: One side of the threaded sleeve (32) is fixedly installed with a limiting strip (33), and one side of the two mounting brackets (29) is provided with a limiting groove (34). One end of the two limiting strips (33) is slidably installed inside the limiting groove (34).

4. The automated winding equipment for semi-finished artificial graphite rolls according to claim 2, characterized in that: Electric push rods (35) are fixedly installed on the other side of the threaded sleeve (32). Connecting strips (36) are fixedly installed on the transmission ends of the two electric push rods (35). Material support wheels (37) are rotatably installed on the lower part of one end of the two connecting strips (36). The material support wheels (37) are made of silicone material. Photoelectric beam sensors are installed on the upper part of one end of the two connecting strips (36) and the top of the two feeding rods (4).

5. The automated winding equipment for semi-finished artificial graphite rolls according to claim 1, characterized in that: The transmission assembly includes a lower gear column (15), which is fixedly installed at the output end of the servo motor (14) and located in the lower part of the transmission frame (13). A lower shaft (16) is fixedly installed at one end of the lower gear column (15), and a lower gear (17) is fixedly installed at one end of the lower shaft (16). An upper gear (18) is meshed with the upper part of the lower gear (17), and an upper shaft (19) is fixedly installed on one side of the upper gear (18). An upper gear column (20) is fixedly installed at one end of the upper shaft (19), and one end of the upper gear column (20) is rotatably connected to the inside of the transmission frame (13). The surfaces of the upper shaft (19) and the lower shaft (16) are rotatably connected to the other side of the transmission frame (13) through a bushing (21).

6. The automated winding equipment for semi-finished artificial graphite rolls according to claim 5, characterized in that: The transmission frame (13) has sliders (22) fixedly installed on both inner walls, and the gear rail (12) has grooves (23) on both sides. The two sliders (22) are slidably installed inside the two grooves (23).

7. An automated winding device for semi-finished artificial graphite rolls according to claim 5, characterized in that: Both sides of the transmission frame (13) are fixedly installed with support columns (25) via support arms (24). Slide rods (26) are movably inserted into the surface of the two support columns (25). One end of each slide rod (26) is fixedly connected to the support frame (11). Electric telescopic rods (42) are fixedly installed at the bottom of the two support columns (25). Protective boxes (38) are fixedly installed at the transmission ends of the bottom of the two electric telescopic rods (42). Hydraulic cylinders (39) are fixedly installed at both ends of the two protective boxes (38). The transmission ends of the four hydraulic cylinders (39) extend into the interior of the two protective boxes (38) and are fixedly connected to the four clamping hoops (40) respectively.

Images