Ball taking equipment of ball forming device

Abstract

The invention discloses ball taking equipment of a ball forming device, and relates to the technical field of powdery material ball forming. The device comprises a base frame, a hollow rod is fixedly installed on the upper surface of the base frame, a movable rod is slidably installed on the inner wall of the hollow rod, a ball taking channel is arranged above the movable rod, a ball taking hopper is fixedly installed at one end of the ball taking channel, and a ball taking mechanism is arranged between the movable rod and the ball taking channel. According to the ball taking device, the ball taking hopper is in a downward inclined state and enters the pot body of the pot type ball forming machine, the ball taking mechanism controls the ball taking channel and the ball taking hopper to rotate with the axis of the rotating shaft as the circle center, the ball taking hopper inclines up and down, and the ball taking hopper is matched with rotation of the pot body of the pot type ball forming machine; the balls in the pot body continuously roll outwards along the ball taking hopper and the ball taking channel through the ball taking channel and the ball taking hopper in the moving process, so that automatic ball taking under the non-stop state of the pot type ball forming mill is conveniently realized, the ball taking convenience is effectively improved, the manual operation intensity is reduced, and the ball forming efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder material pelletizing, in particular to a pelletizing device for taking pellets from a pelletizer. Background Art

[0002] The ball forming machine is the main equipment for powdered materials to form balls. It has the advantages of uniform ball forming, easy to control the moisture content of the balls, high ball strength, simple structure, convenient control, low power consumption and stable operation. However, the existing technology still has some defects when taking out the balls in the ball forming device: In the prior art, when taking out the balls, the balls in the pot of the ball forming device are usually taken out manually using a basin, a water ladle or other containers, which makes it inconvenient to take out the balls and requires a lot of manual work time, resulting in high manual work intensity and affecting the ball making efficiency. In view of the above problems, the inventor proposes a ball-forming and ball-retrieving device for solving the above problems. Summary of the invention

[0003] In order to solve the problem that it is inconvenient to take out the balls in the ball forming machine in the prior art, the purpose of the present invention is to provide a ball taking device for a ball forming machine.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a ball-forming device for taking out a ball, comprising a base frame, a hollow rod is fixedly installed on the upper surface of the base frame, a movable rod is slidably installed on the inner wall of the hollow rod, a ball-taking channel is provided above the movable rod, a ball-taking bucket is fixedly installed at one end of the ball-taking channel, a ball-taking mechanism is provided between the movable rod and the ball-taking channel, a discharge mechanism is provided at one end of the ball-taking channel away from the ball-taking bucket, and an adjustment mechanism is provided between the base frame and the movable rod.

[0005] Preferably, the ball retrieval mechanism includes a push-pull rod, a connecting seat is fixedly installed on the outer wall of the ball retrieval channel, one end of the push-pull rod is hinged to the connecting seat, one end of the movable rod is fixedly installed with a U-shaped seat, both ends of the U-shaped seat are rotatably installed with rotating shafts, and one end of the two rotating shafts is fixedly connected to the outer wall of the ball retrieval channel.

[0006] Preferably, a first motor is provided between the base frame and the ball taking channel, a first rotating rod is fixedly installed on the driving output end of the first motor, a driving rod is fixedly installed on one end of the first rotating rod, a connecting shaft is fixedly installed on one end of the driving rod, and one end of the connecting shaft is rotatably connected to the other end of the push-pull rod.

[0007] Preferably, the discharge mechanism includes a cover plate, which is arranged at one end of the ball taking channel away from the ball taking bucket, and two side panels are fixedly installed at the end of the ball taking channel away from the ball taking bucket, a rotating shaft is rotatably installed between the two side plates, a connecting frame is fixedly installed at one end of the rotating shaft, and one end of the connecting frame is fixedly connected to one side of the cover plate.

[0008] Preferably, a transmission gear is fixedly mounted on the other end of the rotating shaft, a fixing frame is provided between the base frame and the ball taking channel, and an arc-surface gear ring is fixedly mounted on one end of the fixing frame.

[0009] Preferably, the adjustment mechanism includes a frame plate, one end of which is fixedly mounted on the upper surface of the base frame, a slide groove is provided on the frame plate, a slider is slidably mounted on one end of the slide groove, a Z-shaped lifting frame is fixedly mounted on one side of the slider, one end of the Z-shaped lifting frame is fixedly connected to a movable rod, one end of the fixed frame is fixedly connected to one end of the Z-shaped lifting frame, a fixed plate is fixedly mounted on one end of the Z-shaped lifting frame, and the first motor is fixedly mounted on the fixed plate.

[0010] Preferably, a second motor is fixedly mounted on one end of the frame plate away from the base frame, a second rotating rod is fixedly mounted on the driving output end of the second motor, a lead screw is rotatably mounted on the frame plate, the lead screw passes through the slide groove and is rotatably connected to the slider thread, a bevel gear is fixedly mounted on one end of the second rotating rod and one end of the lead screw, and the two bevel gears are meshed with each other.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the ball taking bucket is tilted downward and enters the pot body of the pot-type ball forming machine. The ball taking mechanism controls the ball taking channel and the ball taking bucket to rotate with the axis of the rotating shaft as the center of the circle, so that the ball taking bucket tilts up and down. In conjunction with the rotation of the pot body of the pot-type ball forming machine, the balls in the pot body continuously roll outward along the ball taking bucket and the ball taking channel through the ball taking channel and the ball taking bucket during the movement, thereby conveniently realizing the automatic ball taking of the pot-type ball forming machine without stopping the machine, thereby effectively improving the convenience of taking balls, reducing the intensity of manual work, and improving the ball making efficiency; 2. In the present invention, by driving the cover plate in the discharge mechanism to open automatically, the taken balls roll outward along the ball taking bucket and the ball taking channel, and the balls automatically roll down into the collection tank through the tail end of the ball taking channel, thereby conveniently realizing the automatic collection of the balls after taking them, and further facilitating the subsequent unified transfer of the balls by the operators; 3. In the present invention, the Z-shaped lifting frame in the adjustment mechanism drives the movable rod to rise and fall vertically, and the movable rod causes the ball taking channel and the ball taking bucket to rise and fall synchronously through the U-shaped seat and the rotating shaft, so that the height of the ball taking channel and the ball taking bucket are adapted to the height of the pot body of the pot-type ball forming machine, thereby conveniently realizing the height adjustment of the ball taking channel and the ball taking bucket, thereby improving the flexibility of the ball taking equipment of the ball forming machine, so as to facilitate the removal of balls in pot-type ball forming machines of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The present invention is a schematic diagram of the overall structure of a ball-forming device for taking out a ball.

[0014] Figure 2 This is another overall structural schematic diagram of a ball-forming and ball-retrieving device of the present invention.

[0015] Figure 3 It is a schematic diagram of the connection structure between the ball taking mechanism, the material discharging mechanism and the adjusting mechanism and the ball taking channel of the present invention.

[0016] Figure 4 For the present invention Figure 3 A magnified schematic diagram of part A in FIG.

[0017] Figure 5 For the present invention Figure 3 An enlarged schematic diagram of part B in FIG.

[0018] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of part C in FIG.

[0019] Figure 7 It is a schematic diagram of the cross-section structure of the connection of the discharge mechanism and the ball taking channel of the present invention.

[0020] Figure 8 This is a state diagram before taking the ball according to an embodiment of the present invention.

[0021] Fig. 9 This is a state diagram of taking a ball in an embodiment of the present invention.

[0022] In the figure: 1. base frame; 11. hollow rod; 12. movable rod; 2. ball taking channel; 21. ball taking bucket; 3. collecting tank; 4. ball taking mechanism; 41. push-pull rod; 42. connecting seat; 43. U-shaped seat; 44. rotating shaft; 45. first motor; 46. first rotating rod; 47. driving rod; 48. connecting shaft; 5. discharging mechanism; 51. cover plate; 52. rubber ring; 53. counterweight seat; 54. side plate; 55. rotating shaft; 56. connecting frame; 57. transmission gear; 58. fixed frame; 59. arc gear ring; 6. adjusting mechanism; 61. frame plate; 62. slide groove; 63. slider; 64. Z-type lifting frame; 65. fixed plate; 66. second motor; 67. second rotating rod; 68. lead screw; 69. bevel gear; 70. pot body. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example: Figure 1-9As shown, the present invention provides a ball taking device for a ball forming machine, comprising a base frame 1, a hollow rod 11 is fixedly installed on the upper surface of the base frame 1, a movable rod 12 is slidably installed on the inner wall of the hollow rod 11, a ball taking channel 2 is provided above the movable rod 12, a ball taking bucket 21 is fixedly installed at one end of the ball taking channel 2, by setting the ball taking channel 2 and the ball taking bucket 21, when the ball taking bucket 21 enters the pot body 70 of the pot-type ball forming machine and is in a downward tilted state, as the pot body 70 rotates, the balls formed in the pot body 70 fall out The ball taking channel 2 and the inner wall of the ball taking bucket 21 are coated with polyurethane to protect the inner wall of the pot body 70 of the pot-type ball forming machine and the processed balls. A collecting tank 3 is fixedly installed on the upper surface of the base frame 1. The collecting tank 3 is located below the end of the ball taking channel 2 away from the ball taking bucket 21. By setting the collecting tank 3, the balls rolling down through the ball taking channel 2 can roll into the collecting tank 3 and be collected by the collecting tank 3. A ball taking mechanism 4 is provided between the movable rod 12 and the ball taking channel 2. By setting the ball taking mechanism 4, the ball taking mechanism 4 The ball taking channel 2 and the ball taking bucket 21 can be tilted downward or upward. When the ball taking bucket 21 tilts downward, the balls in the pot body 70 enter the ball taking bucket 21. When the ball taking bucket 21 tilts upward, the balls in the ball taking bucket 21 roll down into the ball taking channel 2, thereby realizing automatic ball taking without stopping the pot-type ball forming machine, thereby effectively improving the convenience of taking balls, reducing the intensity of manual work, and improving the ball making efficiency. The end of the ball taking channel 2 away from the ball taking bucket 21 is provided with a discharge mechanism 5. By setting the discharge mechanism 5, the discharge mechanism 5 can make the tail end of the ball taking channel 2 in an open state, and the balls rolling into the ball taking channel 2 roll into the collection tank 3 through the ball taking channel 2, thereby conveniently realizing the automatic collection of the balls after taking, and facilitating the uniform transportation of the collected balls by the operators. An adjustment mechanism 6 is provided between the base frame 1 and the movable rod 12. By setting the adjustment mechanism 6, the adjustment mechanism 6 can adjust the height of the ball taking channel 2 and the ball taking bucket 21, so that the ball taking channel 2 and the ball taking bucket 21 can enter the pot body 70 of the pot-type ball forming machine of different heights.

[0025] The ball taking mechanism 4 includes a push-pull rod 41, a connecting seat 42 is fixedly installed on the outer wall of the ball taking channel 2, one end of the push-pull rod 41 is hinged to the connecting seat 42, one end of the movable rod 12 is fixedly installed with a U-shaped seat 43, both ends of the U-shaped seat 43 are rotatably installed with rotating shafts 44, one end of the two rotating shafts 44 is fixedly connected to the outer wall of the ball taking channel 2, by setting the U-shaped seat 43 and the rotating shaft 44, the ball taking channel 2 can rotate with the axis center of the rotating shaft 44 of the U-shaped seat 43 as the center of the circle, and by driving the push-pull rod 41 to reciprocate, the end of the push-pull rod 41 can rotate in the connecting seat 42 and push and pull the tail end of the ball taking channel 2 upward or downward.

[0026] A first motor 45 is provided between the base frame 1 and the ball taking channel 2, and a first rotating rod 46 is fixedly installed on the driving output end of the first motor 45, a driving rod 47 is fixedly installed on one end of the first rotating rod 46, a connecting shaft 48 is fixedly installed on one end of the driving rod 47, and one end of the connecting shaft 48 is rotatably connected to the other end of the push-pull rod 41. By turning on the first motor 45, the driving shaft of the first motor 45 can rotate the first rotating rod 46, and the first rotating rod 46 can make the push-pull rod 41 revolve around the axis of the first rotating rod 46 as the center of the circle through the driving rod 47 and the connecting shaft 48. During the circular revolution, the push-pull rod 41 makes the tail end of the ball taking channel 2 upward or downward through the connecting seat 42.

[0027] The discharge mechanism 5 includes a cover plate 51. By setting the cover plate 51, the cover plate 51 can seal or open the tail end of the ball taking channel 2. After opening, the balls in the ball taking channel 2 can pass through the position of the cover plate 51 and roll down. The cover plate 51 is set at the end of the ball taking channel 2 away from the ball taking bucket 21. Two side panels 54 are fixedly installed at the end of the ball taking channel 2 away from the ball taking bucket 21. A rotating shaft 55 is rotatably installed between the two side panels 54. A connecting frame 56 is fixedly installed at one end of the rotating shaft 55. One end of the connecting frame 56 is fixedly connected to one side of the cover plate 51. By driving the rotating shaft 55 to rotate, the rotating shaft 55 can flip the cover plate 51 through the connecting frame 56, so that the cover plate 51 is separated from the tail end of the ball taking channel 2 or sealed at the tail end of the ball taking channel 2.

[0028] A rubber ring 52 is fixedly installed on the outer wall of the cover plate 51, and the outer wall of the rubber ring 52 is in movable contact with the inner wall of the end of the ball taking channel 2 away from the ball taking bucket 21. By setting the rubber ring 52, the rubber ring 52 can improve the sealing between the cover plate 51 and the rear end of the ball taking channel 2.

[0029] A counterweight seat 53 is fixedly mounted on the other side of the cover plate 51 . By providing the counterweight seat 53 , the counterweight seat 53 can improve the stability of the cover plate 51 in the closed state.

[0030] A transmission gear 57 is fixedly installed on the other end of the rotating shaft 55, and a fixing frame 58 is provided between the base frame 1 and the ball taking channel 2. An arc-shaped gear ring 59 is fixedly installed on one end of the fixing frame 58. By arranging the transmission gear 57 and the arc-shaped gear ring 59, when the ball taking channel 2 rotates with the axis of the rotating shaft 44 as the center of the circle, and the tail end of the ball taking channel 2 flips downward, the transmission gear 57 follows the circumferential revolution. As the transmission gear 57 meshes with the arc-shaped gear ring 59, the transmission gear 57 rotates by itself under the action of the arc-shaped gear ring 59 during the circumferential revolution. The transmission gear 57 rotates the rotating shaft 55, and the rotating shaft 55 flips the cover plate 51 through the connecting frame 56.

[0031] The adjusting mechanism 6 includes a frame plate 61, one end of which is fixedly mounted on the upper surface of the base frame 1, a slide groove 62 is provided on the frame plate 61, a slider 63 is slidably mounted on one end of the slide groove 62, a Z-shaped lifting frame 64 is fixedly mounted on one side of the slider 63, one end of the Z-shaped lifting frame 64 is fixedly connected to the movable rod 12, one end of the fixed frame 58 is fixedly connected to one end of the Z-shaped lifting frame 64, one end of the Z-shaped lifting frame 64 is fixedly mounted with a fixing plate 65, the first motor 45 is fixedly mounted on the fixing plate 65, and by driving the slider 63 to slide vertically in the slide groove 62, the slider 63 can lift the movable rod 12 in the hollow rod 11 through the Z-shaped lifting frame 64, the movable rod 12 makes the ball taking channel 2 and the ball taking bucket 21 rise and fall synchronously through the U-shaped seat 43 and the rotating shaft 44, and at the same time makes the arc gear ring 59 rise and fall synchronously through the fixed frame 58, and by setting the fixing plate 65, the first motor 45 installed on the fixing plate 65 follows the synchronous rise and fall.

[0032] A second motor 66 is fixedly installed at one end of the frame plate 61 away from the base frame 1, and a second rotating rod 67 is fixedly installed at the driving output end of the second motor 66. A lead screw 68 is rotatably installed on the frame plate 61, and the lead screw 68 passes through the slide groove 62 and is threadedly rotatably connected to the slider 63. A bevel gear 69 is fixedly installed at one end of the second rotating rod 67 and one end of the lead screw 68, and the two bevel gears 69 are meshed with each other. By turning on the second motor 66, the driving shaft of the second motor 66 can rotate the second rotating rod 67, and the second rotating rod 67 can rotate the lead screw 68 through the bevel gear 69, and the lead screw 68 can drive the slider 63 to slide vertically in the slide groove 62.

[0033] Working principle: During the ball-making process of the pot-type ball-forming machine, the operator first moves the device to the side of the opening of the pot body 70 of the pot-type ball-forming machine (refer to Figure 8 ), and the ball bucket 21 enters the pot body 70 through the opening of the pot body 70; At this time, the operator turns on the first motor 45, and the driving shaft of the first motor 45 rotates the first rotating rod 46. The first rotating rod 46 causes the push-pull rod 41 to revolve around the axis of the first rotating rod 46 as the center of the circle through the driving rod 47 and the connecting shaft 48. During the circular revolution, the push-pull rod 41 makes the tail end of the ball taking channel 2 upward through the connecting seat 42. At this time, the ball taking channel 2 rotates around the axis of the rotating shaft 44 as the center of the circle, and the ball taking bucket 21 entering the pot body 70 is in a downward tilted state. As the pot-type ball forming machine rotates (the pot body 70 of the pot-type ball forming machine is in a tilted state during the ball making process (refer to Figure 8 and Fig. 9), and the machine does not stop), the balls formed in the pot body 70 fall into the ball taking bucket 21. At the same time, as the push-pull rod 41 continues to operate, the push-pull rod 41 pulls the tail end of the ball taking channel 2 through the connecting seat 42 to gradually tilt downward. At this time, the ball taking bucket 21 gradually tilts upward, and the balls entering the ball taking bucket 21 roll down to the ball taking channel 2 under the action of their own weight, thereby conveniently realizing the automatic ball taking of the pot-type ball forming machine without stopping the machine, thereby effectively improving the convenience of taking balls, reducing the intensity of manual work, and improving the efficiency of ball making; During this process, as the tail end of the ball taking channel 2 gradually tilts downward, the transmission gear 57 orbits downward with the axis of the rotating shaft 44 as the center, and the downward orbiting transmission gear 57 meshes with the arc surface gear ring 59 and rotates, and the transmission gear 57 rotates the rotating shaft 55, and the rotating shaft 55 flips and opens the cover plate 51 through the connecting frame 56. At this time, the tail end of the ball taking channel 2 is in an open state, and the balls in the ball taking channel 2 roll down along the ball taking channel 2 and fall into the collection tank 3, thereby facilitating the automatic collection of the balls after taking them, and further facilitating the subsequent unified transportation of the balls by the operating personnel; When it is necessary to take out the balls in the pot body 70 of the pot-type ball forming machine at different heights, the operator turns on the second motor 66, and the driving shaft of the second motor 66 rotates the second rotating rod 67, and the second rotating rod 67 rotates the screw 68 through two bevel gears 69, and the screw 68 drives the slider 63 to slide vertically in the slide groove 62, and the slider 63 makes the movable rod 12 rise and fall in the hollow rod 11 through the Z-type lifting frame 64, and the movable rod 12 makes the ball taking channel 2 and the ball taking bucket 21 rise and fall synchronously through the U-shaped seat 43 and the rotating shaft 44, so that the height of the ball taking channel 2 and the ball taking bucket 21 are adapted to the height of the pot body 70 of the pot-type ball forming machine, thereby conveniently realizing the height adjustment of the ball taking channel 2 and the ball taking bucket 21, thereby improving the flexibility of the ball taking equipment of the ball forming machine, so as to facilitate the removal of balls from pot-type ball forming machines at different heights.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A ball-forming device for taking out balls, comprising a base frame (1), characterized in that: A hollow rod (11) is fixedly mounted on the upper surface of the base frame (1), a movable rod (12) is slidably mounted on the inner wall of the hollow rod (11), a ball taking channel (2) is provided above the movable rod (12), a ball taking bucket (21) is fixedly mounted at one end of the ball taking channel (2), a ball taking mechanism (4) is provided between the movable rod (12) and the ball taking channel (2), a discharge mechanism (5) is provided at one end of the ball taking channel (2) away from the ball taking bucket (21), and an adjustment mechanism (6) is provided between the base frame (1) and the movable rod (12).

2. A ball-forming device for taking out balls as claimed in claim 1, characterized in that: A collection tank (3) is fixedly mounted on the upper surface of the base frame (1), and the collection tank (3) is located below an end of the ball taking channel (2) away from the ball taking bucket (21).

3. A ball-forming device for taking out balls as claimed in claim 1, characterized in that: The ball taking mechanism (4) comprises a push-pull rod (41), a connecting seat (42) is fixedly mounted on the outer wall of the ball taking channel (2), one end of the push-pull rod (41) is hinged to the connecting seat (42), one end of the movable rod (12) is fixedly mounted with a U-shaped seat (43), both ends of the U-shaped seat (43) are rotatably mounted with rotating shafts (44), and one end of the two rotating shafts (44) is fixedly connected to the outer wall of the ball taking channel (2).

4. A ball-forming device for taking out balls as claimed in claim 3, characterized in that: A first motor (45) is provided between the base frame (1) and the ball taking passage (2); a first rotating rod (46) is fixedly mounted on a driving output end of the first motor (45); a driving rod (47) is fixedly mounted on one end of the first rotating rod (46); a connecting shaft (48) is fixedly mounted on one end of the driving rod (47); one end of the connecting shaft (48) is rotatably connected to the other end of the push-pull rod (41).

5. A ball-forming device for taking out balls as claimed in claim 4, characterized in that: The discharge mechanism (5) comprises a cover plate (51), the cover plate (51) being arranged at one end of the ball taking channel (2) away from the ball taking bucket (21), two side plates (54) being fixedly mounted at the one end of the ball taking channel (2) away from the ball taking bucket (21), a rotating shaft (55) being rotatably mounted between the two side plates (54), a connecting frame (56) being fixedly mounted at one end of the rotating shaft (55), and one end of the connecting frame (56) being fixedly connected to one side of the cover plate (51).

6. A ball-forming device for taking out balls as claimed in claim 5, characterized in that: A rubber ring (52) is fixedly mounted on the outer wall of the cover plate (51), and the outer wall of the rubber ring (52) is in movable contact with the inner wall of the ball taking passage (2) at one end away from the ball taking bucket (21).

7. A ball-forming device for taking out balls as claimed in claim 5, characterized in that: A counterweight seat (53) is fixedly mounted on the other side of the cover plate (51).

8. A ball-forming device for taking out balls as claimed in claim 5, characterized in that: A transmission gear (57) is fixedly mounted on the other end of the rotating shaft (55), a fixing frame (58) is provided between the base frame (1) and the ball taking passage (2), and a curved gear ring (59) is fixedly mounted on one end of the fixing frame (58).

9. A ball-forming device for taking out balls as claimed in claim 8, characterized in that: The adjusting mechanism (6) comprises a frame plate (61), one end of the frame plate (61) is fixedly mounted on the upper surface of the base frame (1), a slide groove (62) is provided on the frame plate (61), a slider (63) is slidably mounted on one end of the slide groove (62), a Z-shaped lifting frame (64) is fixedly mounted on one side of the slider (63), one end of the Z-shaped lifting frame (64) is fixedly connected to the movable rod (12), one end of the fixed frame (58) is fixedly connected to one end of the Z-shaped lifting frame (64), one end of the Z-shaped lifting frame (64) is fixedly mounted with a fixing plate (65), and the first motor (45) is fixedly mounted on the fixing plate (65).

10. A ball-forming device for taking out balls as claimed in claim 9, characterized in that: A second motor (66) is fixedly mounted on one end of the frame plate (61) away from the base frame (1); a second rotating rod (67) is fixedly mounted on the driving output end of the second motor (66); a lead screw (68) is rotatably mounted on the frame plate (61); the lead screw (68) passes through the slide groove (62) and is threadedly rotatably connected to the slider (63); a bevel gear (69) is fixedly mounted on one end of the second rotating rod (67) and one end of the lead screw (68); the two bevel gears (69) are meshed with each other.

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