Drilling machine for mold machining

Abstract

The invention relates to the field of mold drilling, and discloses a drilling machine for mold machining, which comprises a workbench and a collecting frame, the collecting frame is arranged below the workbench, a material storage structure is arranged on the left side of the upper surface of the workbench, a middle groove is formed in the middle of the upper surface of the workbench, and fixing rings are fixedly arranged on the inner walls of the front side and the rear side of the middle groove. The multiple sets of placing structures can be driven by the rotating structure to rotate for feeding, so that a to-be-drilled die is fed to the position above and below the lifting drilling structure, when the lifting drilling structure drives a rotating drill bit to move downwards, the lower die can be drilled, and when the lifting drilling structure drives the drill bit to move upwards, the lower die can be drilled. According to the drilling device, the rotating drill bit can be driven to be turned over and switched to be in the vertically-upward state through the automatic turning switching structure, so that the drill bit can drill a mold located above when moving upwards, the working time is fully utilized, and the drilling working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mold drilling, in particular to a drilling machine for mold processing. Background Art

[0002] Mold drilling refers to the operation of using a drill bit to make holes in the material during the mold processing process. It is mainly used for structural processing such as ejector holes and cooling water channels. During the drilling process, a drilling machine is used; The drilling machine in the prior art can further play the role of auxiliary guidance and limit by setting the guide assembly through the setting of the guide shaft, thereby improving the stability of the up and down displacement of the tool, and at the same time improving its drilling accuracy, avoiding the occurrence of its jumping and affecting its drilling accuracy. At the same time, its up and down displacement is automatically controlled by the meshing transmission of the gear and rack; In the drilling machine of the prior art, the tool moves down to drill, but when the tool moves up after drilling, the mold after drilling must be removed before drilling can be performed again. In this way, the working time spent on moving the tool up and taking and placing the mold is not fully utilized, which reduces work efficiency. Therefore, there is room for improvement. Summary of the Invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides a drilling machine for mold processing.

[0004] The present invention provides a drilling machine for mold processing that adopts the following technical solutions: A drilling machine for mold processing, comprising a workbench and a collection frame, wherein the collection frame is provided below the workbench, a material storage structure is provided on the left side of the workbench, an intermediate groove is provided in the middle of the workbench, fixed rings are fixedly provided on the inner walls of the front and rear sides of the intermediate groove, a rotating structure is provided between the two fixed rings, two vertical plates are provided on the inner wall of the intermediate groove, and a lifting drilling structure is provided between the two vertical plates; The lifting and drilling structure includes a vertical groove opened on the inner wall of the vertical plate, a lifting plate is slidably arranged in the vertical groove, a hydraulic cylinder is installed in the middle of the inner wall of the vertical plate, the bottom end of the hydraulic cylinder output shaft is connected to the lifting plate, the two lifting plates are close to each other and are rotatably connected with a rotating shaft in the middle of one side, an automatic flip switching structure is set between the rotating shaft and the vertical plate, an intermediate disk is installed between the two rotating shafts, a first motor is installed on the intermediate disk, and a drill bit is installed at the bottom end of the output shaft of the first motor.

[0005] Preferably, the automatic flip switching structure includes a fixed block arranged on the lifting plate, a driving frame movably passed through the fixed block, a first gear fixedly sleeved on the rotating shaft, the first gear is meshedly connected with the teeth on the driving frame, and protrusions are connected to the front and rear ends of the driving frame, an insertion rod is fixed through the protrusion, a driving groove is provided on the vertical plate at the insertion rod, and one end of the insertion rod is movably inserted into the driving groove.

[0006] Preferably, the rotating structure includes an annular plate rotatably arranged between two fixed rings, a mounting plate is connected to the upper edge of the fixed ring on the rear side, a second motor is installed on the mounting plate, a second gear is fixedly sleeved on one end of the output shaft of the second motor, a gear ring is fixedly sleeved on the rear edge of the annular plate, the second gear is meshed with the teeth on the gear ring, and multiple groups of placement structures are arranged on the annular plate.

[0007] Preferably, the placement structure includes a plurality of mounting grooves provided on the annular plate at equal angles on the circumference, a fixing rod is connected to the middle of the inner walls on the front and rear sides of each mounting groove, a placement frame is installed between each group of two fixing rods, a feed port is provided at the upper end of the placement frame, drilling grooves are provided on the left and right side surfaces of the placement frame, and a shielding structure is provided on the placement frame at the feed port.

[0008] Preferably, the shielding structure includes a T-shaped rod connected to the upper side of the placement frame, a baffle is movably mounted on the T-shaped rod, the baffle is tightly attached to the feed port, a first spring is mounted on the T-shaped rod, the two ends of the first spring are respectively connected to one end of the T-shaped rod and the baffle, and a push plate is connected to the upper edge of one side of the baffle.

[0009] Preferably, the material storage structure includes a first fixed plate installed on the left side of the workbench, a storage frame is installed on the first fixed plate, a material discharge trough is opened on the left side of the lower inner wall of the storage frame, a material pulling structure is set in the storage frame, a fixed frame is set on the left side of the storage frame, and a material pushing structure is set in the fixed frame.

[0010] Preferably, the pulling structure includes a groove opened in the middle of the lower inner wall of the storage frame, a guide rod is connected between the groove walls at both ends of the groove, a pulling plate is slidably arranged in the groove, a second spring is mounted on the guide rod, and the two ends of the second spring are respectively connected to the pulling plate and the groove wall at one end of the groove.

[0011] Preferably, the pushing structure includes a second fixed plate connected to the left side of the inner wall of the fixed frame, a cylinder is installed on the second fixed plate, one end of the cylinder output shaft is connected to the U-shaped frame, pushing frames are installed on both ends of the U-shaped frame, a clamping structure is arranged in the pushing frame, the pushing frame is located directly below the discharge chute, and a horizontal plate is connected to the left edge of the upper side of the pushing frame, and the horizontal plate is arranged close to the bottom of the storage frame.

[0012] Preferably, the clamping structure includes a receiving groove opened in the middle of the inner walls on the front and rear sides of the pushing frame, a clamping block is arranged in the receiving groove, a through bar is connected to the clamping block, a through groove for the through bar to pass through is opened on the wall of the receiving groove, one end of each of the through bars is connected to a driving plate, a push-pull groove is opened on the driving plate, an electric telescopic rod is installed in the middle of the inner wall of the U-shaped frame, one end of the output shaft of the electric telescopic rod is connected to a moving bar, both ends of the moving bar are fixed through the push-pull rod, and the bottom end of the push-pull rod is movably inserted into the push-pull groove.

[0013] In summary, the present invention has the following beneficial technical effects: 1. The present invention is provided with a rotating structure, a lifting drilling structure, a placement structure and an automatic flip switching structure. The rotating structure can drive multiple groups of placement structures to rotate and load materials, thereby loading the mold to be drilled to the upper and lower positions of the lifting drilling structure. In this way, when the lifting drilling structure drives the rotating drill bit to move downward, it can drill the mold below. When the lifting drilling structure drives the drill bit to move upward, the automatic flip switching structure can drive the rotating drill bit to flip and switch to a vertical upward state, so that when the drill bit moves upward, it can drill the mold above. This makes full use of working time and improves drilling work efficiency. 2. The present invention sets a pulling structure, a pushing structure, a storage structure, a clamping structure and a shielding structure. The pulling structure can pull multiple molds to be processed stored in the storage structure to the pushing structure in sequence. After the clamping structure clamps and fixes the corresponding mold, the pushing structure automatically pushes the mold to the corresponding placement structure for automatic loading, further improving work efficiency. The shielding structure is used to shield the mold at the feed port of the placement frame, so that the problem of the mold falling in the placement structure is avoided when the rotating structure drives the placement structure to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a mold processing drilling machine according to an embodiment of the present invention; Figure 2 2 is a schematic structural diagram of two fixing rings in an embodiment of the present invention; Figure 3 This is a schematic structural diagram of two vertical plates in an embodiment of the present invention; Figure 4 In the embodiment of the present invention Figure 3 A magnified view of the structure at point A; Figure 5 This is a schematic diagram of the structure of the placement frame in an embodiment of the present invention; Figure 6 This is a schematic structural diagram of a storage structure in an embodiment of the present invention; Figure 7is a schematic diagram of the structure within the fixed frame in an embodiment of the present invention; Figure 8 It is a structural diagram of the pusher frame in an embodiment of the present invention.

[0015] Explanation of the accompanying symbols: 1. workbench; 2. middle groove; 3. collecting frame; 4. fixing ring; 5. vertical plate; 6. hydraulic cylinder; 7. vertical groove; 8. lifting plate; 9. rotating shaft; 10. middle plate; 11. first motor; 12. drill bit; 13. fixing block; 14. driving frame; 15. first gear; 16. bump; 17. inserting rod; 18. driving groove; 19. annular plate; 20. mounting plate; 21. second motor; 22. second gear; 23. mounting groove; 24. fixing rod; 25. feeding port; 26. drilling groove; 27. Placement frame; 28. T-shaped rod; 29. ​​Baffle; 30. First spring; 31. Push plate; 32. First fixed plate; 33. Storage frame; 34. Feed chute; 35. Fixed frame; 36. Groove; 37. Guide rod; 38. Second spring; 39. Pull plate; 40. Second fixed plate; 41. Cylinder; 42. U-shaped frame; 43. Feeding frame; 44. Storage groove; 45. Clamp; 46. Through bar; 47. Driving plate; 48. Push-pull groove; 49. Electric telescopic rod; 50. Moving bar; 51. Push-pull rod; 52. Gear ring. DETAILED DESCRIPTION

[0016] The following is combined with Figures 1-8 The present invention is described in further detail.

[0017] Reference Figures 1-8 The embodiment of the present invention discloses a drilling machine for mold processing, comprising a workbench 1 and a collecting frame 3. The collecting frame 3 is provided below the workbench 1, a material storage structure is provided on the left side of the workbench 1, an intermediate groove 2 is provided in the middle of the upper part of the workbench 1, fixed rings 4 are fixedly provided on the inner walls of the front and rear sides of the intermediate groove 2, a rotating structure is provided between the two fixed rings 4, two vertical plates 5 are provided on the inner wall of the intermediate groove 2, and a lifting drilling structure is provided between the two vertical plates 5; When the lifting plate 8 is lowered, the lifting plate 8 moves downward, and the drill bit 12 is driven by the hydraulic cylinder 6 to rotate.

[0018] See also Figure 1-Figure 5 The automatic flip switching structure includes a fixed block 13 provided on the lifting plate 8, a driving frame 14 is movably passed through the fixed block 13, a first gear 15 is fixedly sleeved on the rotating shaft 9, the first gear 15 is meshed with the teeth on the driving frame 14, and the driving frame 14 is connected to the front and rear ends of the driving frame 14. The protrusions 16 are fixedly passed through the insertion rod 17 on the protrusion 16, and a driving groove 18 is provided on the vertical plate 5 at the insertion rod 17, and one end of the insertion rod 17 is movably inserted into the driving groove 18; The rotating structure includes an annular plate 19 that is rotatably arranged between the two fixing rings 4. The upper edge of the fixing ring 4 on the rear side is connected to a mounting plate 20. A second motor 21 is mounted on the mounting plate 20. A second gear 22 is fixedly sleeved on one end of the output shaft of the second motor 21. A gear ring 52 is fixedly sleeved on the rear edge of the annular plate 19. The second gear 22 is meshed with the teeth on the gear ring 52. Multiple groups of placement structures are set on the annular plate 19. The placement structure includes a plurality of mounting grooves 23 provided at equal angles on the annular plate 19. A fixing rod 24 is connected to the middle of the inner wall on both sides of the front and rear of each mounting groove 23. A placement frame 27 is installed between each set of two fixing rods 24. A feed port 25 is provided at the upper end of the placement frame 27. Drilling grooves 26 are provided on the left and right sides of the placement frame 27. A shielding structure is provided on the placement frame 27 at the feed port 25. The shielding structure includes a T-shaped rod 28 connected to the upper side of the placement frame 27, a baffle 29 is movably mounted on the T-shaped rod 28, and the baffle 29 is tightly attached to the feed port 25. A first spring 30 is mounted on the T-shaped rod 28, and both ends of the first spring 30 are respectively connected to one end of the T-shaped rod 28 and the baffle 29. A push plate 31 is connected to the edge of one side of the baffle 29. When the second motor 21 on the mounting plate 20 is started, the annular plate 19 is driven to rotate between the two fixed rings 4 through the second gear 22 and the gear ring 52, thereby automatically transporting the mold to the upward and downward positions of the drill bit 12, and using the baffle 29 At the feed port 25 of the placement frame 27, the placed mold is blocked to prevent the mold from falling from the placement frame 27. At the same time, when the lifting plate 8 drives the drill bit 12 in the downward state to move upward, it drives one end of the insertion rod 17 to slide upward in the driving groove 18. The driving groove 18 wall squeezes the insertion rod 17 to push the driving frame 14 to move on the fixed block 13. The first gear 15 drives the rotating shaft 9 and the intermediate disk 10 to flip upward as a whole, thereby automatically flipping the drill bit 12 to a vertically upward state, so that the lifting plate 8 can perform drilling on the mold above while moving upward.

[0019] See also Figure 1 、 Figure 6 、 Figure 7 and Figure 8 The material storage structure includes a first fixed plate 32 installed on the left side of the workbench 1, a storage frame 33 is installed on the first fixed plate 32, a material discharge chute 34 is opened on the left side of the lower inner wall of the storage frame 33, a material pulling structure is set in the storage frame 33, a fixed frame 35 is set on the left side of the storage frame 33, and a material pushing structure is set in the fixed frame 35; The material pulling structure includes a groove 36 formed in the middle of the lower inner wall of the storage frame 33. A guide rod 37 is connected between the groove walls at both ends of the groove 36. A material pulling plate 39 is slidably arranged in the groove 36. A second spring 38 is sleeved on the guide rod 37. The two ends of the second spring 38 are respectively connected to the material pulling plate 39 and the groove wall at one end of the groove 36. The pushing structure includes a second fixed plate 40 connected to the left side of the inner wall of the fixed frame 35, a cylinder 41 is installed on the second fixed plate 40, one end of the output shaft of the cylinder 41 is connected to the U-shaped frame 42, and a pushing frame 43 is installed on both ends of the U-shaped frame 42. A clamping structure is set in the pushing frame 43. The pushing frame 43 is located directly below the unloading chute 34. The left edge of the upper side of the pushing frame 43 is connected to a horizontal plate, and the horizontal plate is set close to the bottom of the storage frame 33. The clamping structure includes a receiving groove 44 provided in the middle of the inner wall of the front and rear sides of the push frame 43, a clamping block 45 is provided in the receiving groove 44, and a through bar 46 is connected to the clamping block 45. A through slot for the through bar 46 to pass through is provided on the wall of the receiving groove 44, and one end of each through bar 46 is connected to a driving plate 47, and a push-pull groove 48 is provided on the driving plate 47. An electric telescopic rod 49 is installed in the middle of the inner wall of the U-shaped frame 42, and one end of the output shaft of the electric telescopic rod 49 is connected to the moving bar 50. Both ends are fixed through the push-pull rod 51, and the bottom end of the push-pull rod 51 is movably inserted into the push-pull groove 48, and the molds to be drilled are placed in the storage frame 33 in turn. The second spring 38 pulls the pulling plate 39 to stick to one of the molds. When the pushing frame 43 moves to the bottom of the feeding trough 34, the cross plate is completely moved into the fixed frame 35. In this way, the mold pushed to the feeding trough 34 by the pulling plate 39 falls into the pushing frame 43 under the action of gravity, and when the annular plate 19 drives the placing When the placement frame 27 rotates to the storage frame 33, the electric telescopic rod 49 is started to drive the push-pull rod 51 on the moving bar 50 to move in the push-pull groove 48 of the driving plate 47 in the direction away from the push frame 43, thereby driving the two clamping blocks 45 to move towards each other. The mold is clamped and fixed in the push frame 43 by the clamping blocks 45, and then the cylinder 41 is started to drive the push frame 43 to move toward the placement frame 27. In the process of moving the push frame 43, the cross plate is driven to be close to the storage frame 33. When the pushing frame 43 moves to the pushed plate 31, as the pushing frame 43 continues to move, the baffle 29 is pushed away from the top of the placement frame 27. When the pushing frame 43 drives the mold to move to the top of the corresponding placement frame 27, the electric telescopic rod 49 drives the moving bar 50 to move in the opposite direction and reset, thereby releasing the mold. The mold automatically falls from the pushing frame 43 to the placement frame 27 for loading.

[0020] The implementation principle of a drilling machine for mold processing in an embodiment of the present invention is as follows: first, the molds to be drilled are placed in the storage frame 33 in turn, and the second spring 38 pulls the pulling plate 39 to stick to one of the molds. When the pushing frame 43 moves to just below the discharge chute 34, at this time, the cross plate is completely moved into the fixed frame 35, so that the mold pushed to the discharge chute 34 by the pulling plate 39 falls into the pushing frame 43 under the action of gravity, and when the annular plate 19 drives the placement frame 27 to rotate to the storage frame 33, the electric telescopic rod 49 is started to drive the push-pull rod 51 on the moving bar 50 to move in the push-pull groove 48 of the driving plate 47 in the direction away from the pushing frame 43 , thereby driving the two clamping blocks 45 to move toward each other, clamping the mold with the clamping blocks 45 in the pushing frame 43, and then starting the cylinder 41 to drive the pushing frame 43 to move toward the placement frame 27, and in the process of moving the pushing frame 43, driving the cross plate to move close to the bottom of the storage frame 33, thereby shielding the corresponding mold at the discharge chute 34, when the pushing frame 43 moves to the pushed plate 31, as the pushing frame 43 continues to move, the baffle 29 is pushed away from the top of the placement frame 27, and when the pushing frame 43 drives the mold to move to the top of the corresponding placement frame 27, the electric telescopic rod 49 drives the moving bar 50 to move in the opposite direction to repeat. Position, thereby releasing the mold, and the mold automatically falls from the pushing frame 43 to the placement frame 27 for loading. After loading, the cylinder 41 drives the pushing frame 43 to move in the opposite direction and reset to load the next mold, and when the pushing frame 43 moves in the opposite direction, under the elastic force of the first spring 30, the baffle 29 is pushed to reset, and the loaded mold is blocked on the placement frame 27. Then, when the second motor 21 on the mounting plate 20 is started, the annular plate 19 is driven to rotate between the two fixed rings 4 through the second gear 22 and the gear ring 52, so that the loaded mold is automatically transported to the upward and downward positions of the drill bit 12, and then, the hydraulic cylinder 6 is started to drive the lifting plate 8 moves downward, the first motor 11 drives the drill bit 12 to rotate, thereby driving the rotating drill bit 12 to drill the mold below, and then, the lifting plate 8 drives the drill bit 12 in the downward state to move upward, driving one end of the insertion rod 17 to slide upward in the driving groove 18, and the driving groove 18 groove wall squeezes the insertion rod 17 to push the driving frame 14 to move on the fixed block 13, and drives the rotating shaft 9 and the intermediate disk 10 to flip upward as a whole through the first gear 15, thereby automatically flipping the drill bit 12 to a vertical upward state, so that the lifting plate 8 can drill the mold above while moving upward, which makes full use of the working time and has higher drilling efficiency.

[0021] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drilling machine for mold processing, comprising a workbench (1) and a collection frame (3), characterized in that: A collecting frame (3) is provided below the workbench (1), a material storage structure is provided on the left side of the workbench (1), an intermediate groove (2) is provided in the middle of the upper part of the workbench (1), fixed rings (4) are fixedly provided on the inner walls of the front and rear sides of the intermediate groove (2), a rotating structure is provided between the two fixed rings (4), two vertical plates (5) are provided on the inner wall of the intermediate groove (2), and a lifting drilling structure is provided between the two vertical plates (5); The lifting and drilling structure comprises a vertical groove (7) provided on the inner wall of the vertical plate (5), a lifting plate (8) is slidably arranged in the vertical groove (7), a hydraulic cylinder (6) is installed in the middle of the upper inner wall of the vertical plate (5), the bottom end of the output shaft of the hydraulic cylinder (6) is connected to the lifting plate (8), two lifting plates (8) are rotatably connected to a rotating shaft (9) at the middle of one side surface close to each other, an automatic flip switching structure is provided between the rotating shaft (9) and the vertical plate (5), an intermediate disk (10) is installed between the two rotating shafts (9), a first motor (11) is installed on the upper surface of the intermediate disk (10), and a drill bit (12) is installed at the bottom end of the output shaft of the first motor (11).

2. A mold processing drilling machine according to claim 1, characterized in that: The automatic flip switching structure includes a fixed block (13) arranged on the lifting plate (8), a driving frame (14) is movably passed through the fixed block (13), a first gear (15) is fixedly sleeved on the rotating shaft (9), the first gear (15) is meshedly connected with the teeth on the driving frame (14), and the front and rear ends of the driving frame (14) are connected to the protrusions (16), the protrusions (16) are fixedly passed through the insertion rod (17), and a driving groove (18) is provided on the vertical plate (5) at the insertion rod (17), and one end of the insertion rod (17) is movably inserted into the driving groove (18).

3. A mold processing drilling machine according to claim 1, characterized in that: The rotating structure comprises an annular plate (19) rotatably arranged between two fixed rings (4); the upper edge of the fixed ring (4) on the rear side is connected to a mounting plate (20); a second motor (21) is mounted on the mounting plate (20); a second gear (22) is fixedly sleeved on one end of the output shaft of the second motor (21); a gear ring (52) is fixedly sleeved on the rear edge of the annular plate (19); the second gear (22) is meshedly connected with the teeth on the gear ring (52); and multiple groups of placement structures are arranged on the annular plate (19).

4. A mold processing drilling machine according to claim 3, characterized in that: The placement structure includes a plurality of mounting grooves (23) provided at equal angles on the circumference of the annular plate (19), a fixing rod (24) is connected to the middle of the inner walls on both the front and rear sides of each mounting groove (23), a placement frame (27) is installed between each group of two fixing rods (24), a feed port (25) is provided at the upper end of the placement frame (27), drilling grooves (26) are provided on both the left and right side surfaces of the placement frame (27), and a shielding structure is provided on the placement frame (27) at the feed port (25).

5. A mold processing drilling machine according to claim 4, characterized in that: The shielding structure includes a T-shaped rod (28) connected to the upper side of the placement frame (27), a baffle (29) is movably mounted on the T-shaped rod (28), and the baffle (29) is tightly attached to the feed port (25). A first spring (30) is mounted on the T-shaped rod (28), and both ends of the first spring (30) are respectively connected to one end of the T-shaped rod (28) and the baffle (29), and a push plate (31) is connected to the upper edge of one side of the baffle (29).

6. The mold processing drilling machine according to claim 1, characterized in that: The material storage structure comprises a first fixed plate (32) mounted on the left side of the workbench (1); a storage frame (33) is mounted on the first fixed plate (32); a material discharge trough (34) is provided on the left side of the lower inner wall of the storage frame (33); a material pulling structure is provided in the storage frame (33); a fixed frame (35) is provided on the left side of the storage frame (33); and a material pushing structure is provided in the fixed frame (35).

7. A mold processing drilling machine according to claim 6, characterized in that: The material pulling structure includes a groove (36) opened in the middle of the lower inner wall of the storage frame (33), a guide rod (37) is connected between the groove walls at both ends of the groove (36), a material pulling plate (39) is slidably arranged in the groove (36), a second spring (38) is sleeved on the guide rod (37), and the two ends of the second spring (38) are respectively connected to the material pulling plate (39) and the groove wall at one end of the groove (36).

8. The mold processing drilling machine according to claim 6, characterized in that: The pushing structure includes a second fixed plate (40) connected to the left side of the inner wall of the fixed frame (35), a cylinder (41) is installed on the second fixed plate (40), one end of the output shaft of the cylinder (41) is connected to the U-shaped frame (42), and pushing frames (43) are installed on both ends of the U-shaped frame (42). A clamping structure is provided in the pushing frame (43), the pushing frame (43) is located directly below the discharge chute (34), and a horizontal plate is connected to the left edge of the upper side of the pushing frame (43), and the horizontal plate is closely arranged below the storage frame (33).

9. The mold processing drilling machine according to claim 8, characterized in that: The clamping structure includes a receiving groove (44) provided in the middle of the inner walls on both sides of the front and rear sides of the pushing frame (43), a clamping block (45) is provided in the receiving groove (44), a through-bar (46) is connected to the clamping block (45), a through-slot for the through-bar (46) to pass through is provided on the groove wall of the receiving groove (44), one end of each through-bar (46) is connected to a driving plate (47), a push-pull groove (48) is provided on the driving plate (47), an electric telescopic rod (49) is installed in the middle of the inner wall of the U-shaped frame (42), one end of the output shaft of the electric telescopic rod (49) is connected to the moving bar (50), both ends of the moving bar (50) are fixed through the push-pull rod (51), and the bottom end of the push-pull rod (51) is movably inserted into the push-pull groove (48).

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