Pre-pressing device of folding machine for facial tissue production

Abstract

The utility model relates to the technical field of facial tissue production, and discloses a pre-pressing device of a folding machine for facial tissue production, which comprises a folding machine, a fixing frame is arranged on one side of the feeding end of the folding machine, a feeding conveying belt I is movably mounted on the fixing frame, and two movable seats are symmetrically mounted on the fixing frame in a sliding manner; a paper pushing plate is movably mounted between the two movable seats, a paper pressing plate is movably mounted on the fixing frame, a limiting baffle is fixedly mounted on the fixing frame, a second discharging conveying belt is movably mounted on one side of the fixing frame, and a re-pressing mechanism comprising a mounting plate and a paper pressing roller is arranged on the fixing frame. An auxiliary traction mechanism comprising a first paper guide plate and a second paper guide plate is arranged on the fixing frame. By arranging the re-pressing mechanism, in the discharging and conveying process of the facial tissues, the paper pressing roller rolls on the stacked facial tissues so as to carry out secondary re-pressing operation on the facial tissues, and therefore the pressing effect of the stacked facial tissues is further improved.

Description

Technical Field

[0001] This utility model relates to the field of facial tissue production technology, and in particular to a pre-pressing device for a folding machine used in facial tissue production. Background Technology

[0002] A facial tissue folding machine is a device used to fold facial tissues. Since the folded facial tissues are in a fluffy state, they need to be pre-pressed after folding to make them more compact and neat, so as to facilitate subsequent operations such as cutting and packaging.

[0003] The pre-compression operation of stacked facial tissues is usually completed by applying pressure to the tissues with a pressure plate. Since facial tissues have a certain degree of elasticity and flexibility, stacked facial tissues that have only undergone one pre-compression operation may rebound to a certain extent after the pressure plate is pressed down and reset, and gaps may reappear between the folded facial tissues. The compression effect of facial tissues needs to be further improved.

[0004] Therefore, we propose a pre-pressing device for a folding machine used in the production of facial tissues. Utility Model Content

[0005] The present invention mainly addresses the technical problems existing in the prior art by providing a pre-pressing device for a folding machine used in the production of facial tissues.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pre-pressing device for a folding machine for producing facial tissues, comprising a folding machine, a fixed frame provided on one side of the loading and unloading end of the folding machine, a first unloading conveyor belt movably mounted on the fixed frame, two movable seats symmetrically slidably mounted on the fixed frame, a pusher plate movably mounted between the two movable seats, a pressure plate movably mounted on the fixed frame, a limit baffle fixedly mounted on the fixed frame, a second unloading conveyor belt movably mounted on one side of the fixed frame, a re-pressing mechanism including a mounting plate and a pressure roller provided on the fixed frame, and an auxiliary pulling mechanism including a first guide plate and a second guide plate provided on the fixed frame;

[0007] The mounting plate is movably mounted on the fixed frame, the paper pressing roller is rotatably mounted on the lower side of the mounting plate, an infrared transmitter is fixedly mounted on the fixed frame, and an infrared receiver is fixedly mounted on the side of the fixed frame opposite to the infrared transmitter.

[0008] Two guide plates are symmetrically and slidably installed on the fixed frame, with the guide plates positioned above the feeding conveyor belt. Two guide plates are symmetrically and slidably installed on the fixed frame, with the guide plates positioned above the feeding conveyor belt.

[0009] Preferably, the repressing mechanism further includes connecting cylinders, two connecting cylinders are fixedly mounted on the mounting plate, movable columns are slidably mounted on the connecting cylinders, springs are fixedly mounted inside the connecting cylinders, one end of the springs is fixedly connected to the movable columns, and the paper pressing roller is rotatably mounted between the two movable columns.

[0010] Preferably, the repressing mechanism further includes positioning retaining rings, two positioning retaining rings are slidably mounted on the paper pressing roller, the paper pressing roller has an adjustment hole, and the positioning retaining rings are threadedly connected to the adjustment hole by bolts.

[0011] Preferably, the auxiliary traction mechanism further includes a connecting frame 1. Two connecting frames 1 are arranged on the side of the two guide plates 1 that are far apart from each other. The guide plates 1 are slidably installed inside the connecting frame 1. Two connecting frames 2 are arranged on the side of the two guide plates 2 that are far apart from each other. The guide plates 2 are slidably installed inside the connecting frame 2. A lead screw 1 is arranged on one side of the guide plate 1 and is rotatably installed on the fixed frame. A lead screw 2 is arranged on one side of the guide plate 2 and is rotatably installed on the fixed frame.

[0012] Preferably, the threads on lead screw one and lead screw two have opposite directions of rotation. A slider is fixedly installed on connecting frame one, and the slider is slidably installed on the fixed frame. The slider is threadedly connected to lead screw one. Similarly, a slider is fixedly installed on connecting frame two, and the slider on connecting frame two is slidably installed on the fixed frame. The slider on connecting frame two is threadedly connected to lead screw two.

[0013] Preferably, the auxiliary traction mechanism further includes a connecting shaft, which is fixedly installed at one end of lead screw one and lead screw two, and is rotatably installed on the fixed frame.

[0014] Preferably, the auxiliary traction mechanism further includes a driven gear, which is disposed on one side of lead screw one and lead screw two. The driven gear is rotatably mounted on the fixed frame. One driven gear is fixedly connected to one end of the connecting shaft, and the other driven gear is fixedly connected to one end of lead screw two. A drive gear is rotatably mounted between the two adjacent driven gears. The drive gear is rotatably mounted on the fixed frame and meshes with the two driven gears.

[0015] This utility model provides a pre-pressing device for a folding machine used in facial tissue production. Compared with the prior art, it has the following improvements and advantages: By setting a re-pressing mechanism, after the facial tissue is pressed by the pressing plate for the first time, it is conveyed by the feeding conveyor belt one to the feeding conveyor belt two. An infrared transmitter and an infrared receiver work together to determine whether the end of the stacked facial tissue has arrived. Once the arrival of the facial tissue is detected, the auxiliary pulling mechanism works with the feeding conveyor belt two to pull the facial tissue. At the same time, the mounting plate presses down and drives the pressing roller to press the stacked facial tissue. During the feeding process of the facial tissue, the pressing roller rolls on the stacked facial tissue to perform a second re-pressing operation on the facial tissue. At the same time, by setting the pressing roller to be movable up and down, it is ensured that the facial tissue can be pressed while it can be conveyed forward normally, thereby further improving the pressing effect of the stacked facial tissue. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 A schematic diagram of the pre-compression device of a folding machine for producing facial tissues, as proposed in this utility model;

[0018] Figure 2 A schematic diagram of the installation of the limiting baffle in the pre-compression device of a folding machine for producing facial tissues, as proposed in this utility model.

[0019] Figure 3 A schematic diagram of the installation of the re-pressing mechanism in the pre-pressing device of a folding machine for producing facial tissues, as proposed in this utility model;

[0020] Figure 4 A schematic diagram of the installation of the pressure roller in the pre-pressing device of a folding machine for producing facial tissues, as proposed in this utility model.

[0021] Figure 5 A schematic diagram of the installation of the auxiliary pulling mechanism in the pre-compression device of a folding machine for producing facial tissues, as proposed in this utility model;

[0022] Figure 6 This is a schematic diagram of the auxiliary pulling mechanism in the pre-compression device of a folding machine for producing facial tissues, as proposed in this utility model.

[0023] Legend:

[0024] 1. Folding machine; 2. Fixed frame; 3. Movable seat; 4. Pusher plate; 5. Pressing plate; 6. Feeding conveyor belt one; 7. Feeding conveyor belt two; 8. Limiting baffle; 9. Mounting plate; 10. Infrared transmitter; 11. Infrared receiver; 12. Pressing roller; 13. Positioning retaining ring; 14. Connecting cylinder; 15. Movable column; 16. Spring; 17. Guide plate one; 18. Guide plate two; 19. Connecting frame one; 20. Connecting frame two; 21. Lead screw one; 22. Lead screw two; 23. Connecting shaft; 24. Drive gear; 25. Driven gear. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] A pre-pressing device for a folding machine used in facial tissue production, such as Figure 1 - Figure 6As shown, the machine includes a folding machine 1. A fixed frame 2 is provided on one side of the loading / unloading end of the folding machine 1. The fixed frame 2 is placed on the ground. A loading conveyor belt 6 is movably mounted on the fixed frame 2. Two movable seats 3 are symmetrically slidably mounted on the fixed frame 2. The movable seats 3 are slidably mounted on the fixed frame 2 via electric slide rails. A pusher plate 4 is movably mounted between the two movable seats 3, allowing the pusher plate 4 to move up and down between the two movable seats 3. An electric push rod is fixedly installed inside the movable seat 3, and the telescopic end of the electric push rod is fixedly connected to the pusher plate 4. A pressure plate 5 is movably mounted on the fixed frame 2. A hydraulic telescopic rod is fixedly installed on the upper part of the frame 2, and the telescopic end of the hydraulic telescopic rod is fixedly connected to the pressing plate 5. A limit baffle 8 is fixedly installed on the frame 2, and the limit baffle 8 is located on the side opposite to the push plate 4. The limit baffle 8 can position the facial tissue when it is conveyed to the feeding conveyor belt 6. A feeding conveyor belt 7 is movably installed on one side of the frame 2. A re-pressing mechanism is provided on the frame 2. The re-pressing mechanism can perform a second re-pressing operation on the facial tissue after the first pressing, so as to improve the pressing effect of the facial tissue. An auxiliary pulling mechanism is provided on the frame 2. The auxiliary pulling mechanism is located on the upper side of the feeding conveyor belt 7. While the tissues are being conveyed on the second feeding conveyor belt 7, the pressing mechanism performs a second pressing operation on the tissues. Simultaneously, the auxiliary pulling mechanism pulls the tissues to ensure the stability of the tissue conveying. After the folding machine 1 folds the tissues, the stacked tissues are conveyed to the first feeding conveyor belt 6. The pressing plate 5 performs the first pressing operation on the tissues. After the first pressing, the tissues are conveyed via the first feeding conveyor belt 6 to the second feeding conveyor belt 7 and then to the next processing area for processing. During the conveying process on the second feeding conveyor belt 7, the tissues undergo a second pressing operation simultaneously. Through the design... Equipped with a re-pressing mechanism and an auxiliary pulling mechanism, the folding machine 1 folds the facial tissues, and the stacked facial tissues are conveyed to the feeding conveyor belt 6. The pressing plate 5 performs the first pressing operation on the facial tissues. After the first pressing, the facial tissues are conveyed to the feeding conveyor belt 7 via the feeding conveyor belt 6 and then to the next processing area for processing. During the conveying of the facial tissues on the feeding conveyor belt 7, the auxiliary pulling mechanism works with the feeding conveyor belt 7 to pull the facial tissues from one side. Simultaneously, the re-pressing mechanism performs a second pressing operation on the facial tissues to improve the overall pressing effect of the facial tissues.

[0027] Furthermore, the repressing mechanism includes a mounting plate 9, which is movably mounted on a fixed frame 2. A hydraulic telescopic rod is fixedly mounted on the fixed frame 2, and the telescopic end of the hydraulic telescopic rod is fixedly connected to the mounting plate 9. The mounting plate 9 can move up and down on the fixed frame 2. Two connecting cylinders 14 are fixedly mounted on the mounting plate 9, and movable columns 15 are slidably mounted on the connecting cylinders 14. A spring 16 is fixedly mounted inside the connecting cylinders 14, and one end of the spring 16 is fixedly connected to the movable column 15. A paper pressing roller 12 is rotatably mounted between the two movable columns 15. Two positioning retaining rings 13 are slidably mounted on the paper pressing roller 12. The positioning retaining rings 13 are composed of two circular rings. An adjustment hole is opened on the paper pressing roller 12, and the positioning retaining rings 13 are threadedly connected to the adjustment hole by bolts. An infrared transmitter 10 is fixedly mounted on the fixed frame 2, and an infrared receiver 11 is fixedly mounted on the side of the fixed frame 2 opposite to the infrared transmitter 10. The infrared transmitter 10 and the infrared receiver 11 are... 1. Set on the fixed frame 2 near the auxiliary pulling mechanism, when the stacked facial tissues reach the area between the infrared transmitter 10 and the infrared receiver 11, they will block the infrared rays, causing the signal received by the infrared receiver 11 to change, thereby determining that the facial tissues have arrived. With the addition of a re-pressing mechanism, after the facial tissues are first pressed by the pressing plate 5, they are conveyed by the feeding conveyor belt 11 to the feeding conveyor belt 2 7. The infrared transmitter 10 and the infrared receiver 11 work together to determine whether the end of the stacked facial tissues has arrived. Once the arrival of the facial tissues is detected, the mounting plate 9 presses down and drives the pressing roller 12 to press the stacked facial tissues. During the feeding process of the facial tissues, the pressing roller 12 rolls on the stacked facial tissues to perform a second re-pressing operation on the facial tissues. At the same time, by setting the pressing roller 12 to be movable up and down, it is ensured that the facial tissues can be pressed while being conveyed forward normally, thereby further improving the pressing effect of the stacked facial tissues.

[0028] Furthermore, the auxiliary pulling mechanism includes two guide plates 17, which are symmetrically slidably mounted on the fixed frame 2. The guide plates 17 are positioned above the unloading conveyor belt 7. Two guide plates 18 are symmetrically slidably mounted on the fixed frame 2, also positioned above the unloading conveyor belt 7. A connecting frame 19 is provided on the side of each guide plate 17 that is furthest from each other. The guide plates 17 are slidably mounted inside the connecting frame 19. An electric push rod is fixedly installed inside the connecting frame 19, and the telescopic end of the electric push rod is fixedly connected to the guide plate 17. Each of the two cardboard sections 18 has a connecting frame 20 on its far side. The guide plate 18 is slidably installed inside the connecting frame 20. An electric push rod is fixedly installed inside the connecting frame 20, and the telescopic end of the electric push rod is fixedly connected to the guide plate 18. A lead screw 21 is provided on one side of the guide plate 17, and the lead screw 21 is rotatably installed on the fixed frame 2. A slider is fixedly installed on the connecting frame 19, and the slider is slidably installed on the fixed frame 2. The slider is threadedly connected to the lead screw 21. A lead screw 22 is provided on one side of the guide plate 18, and the lead screw 22 is rotatably installed on the fixed frame 2. 1. The thread direction on lead screw 22 is opposite to that on connecting frame 20. A slider is also fixedly installed on connecting frame 20. The slider on connecting frame 20 is slidably mounted on fixed frame 2. The slider on connecting frame 20 is threadedly connected to lead screw 22. When lead screw 1 21 and lead screw 22 rotate synchronously, the sliders on lead screw 1 21 and lead screw 22 slide in opposite directions. A connecting shaft 23 is fixedly installed at one end of both lead screw 1 21 and lead screw 22. The connecting shaft 23 is rotatably mounted on fixed frame 2. The connecting shaft 23 can limit the slider from its end during sliding. Lead screw 1 21... Both the lead screw 22 and the lead screw 22 are provided with driven gears 25 on one side. The driven gears 25 are rotatably mounted on the fixed frame 2. One driven gear 25 is fixedly connected to one end of the connecting shaft 23, and the other driven gear 25 is fixedly connected to one end of the lead screw 22. A drive gear 24 is rotatably mounted between the two adjacent driven gears 25. The drive gear 24 is rotatably mounted on the fixed frame 2. The drive gear 24 meshes with the two driven gears 25. The drive gear 24 is driven by a servo motor. The servo motor is fixedly mounted on the fixed frame 2. The output shaft of the servo motor is fixedly connected to the drive gear 24.With the aid of a pulling mechanism, the facial tissues are first pressed by the pressing plate 5 and then conveyed by the feeding conveyor belt 6 to the feeding conveyor belt 7. When the stacked facial tissues move to the feeding conveyor belt 7, the ends of the facial tissues are first pressed down by the two guide plates 17, and the drive gear 24 drives the two driven gears 25 to rotate, thereby driving the lead screw 21 and the lead screw 22 to rotate synchronously, so that the two guide plates 17 and the two guide plates 28 move to the middle position. When the guide plates 17 and the two guide plates 28 move to the middle position, the two guide plates 28 press down to press down the ends of the facial tissues. The lead screw 21 and the lead screw 22 then... When the rotation is reversed, the two guide plates 18 slide in coordination with the feeding conveyor belt 7, continuing to pull the facial tissue forward. After both guide plates 17 and 18 have moved to their original positions, the two guide plates 18 unlock, and the two guide plates 17 press the facial tissue again and slide towards the center. The two guide plates 17 and 18 work together to achieve continuous traction of the facial tissue. While the facial tissue is being fed and conveyed, a secondary feeding and pressing operation is performed. The feeding and traction operation of the facial tissue is achieved through the cooperation of guide plates 17 and 18 with the feeding conveyor belt 7, ensuring that the facial tissue is stacked stably and does not loosen during the secondary pressing process.

[0029] The working principle of this utility model is as follows: The folding machine 1 folds the facial tissues, and the folded facial tissues are conveyed to the feeding conveyor belt 6. The electric pusher pushes the pusher plate 4 down to one side of the stacked facial tissues. Then the movable seat 3 drives the pusher plate 4 to push the facial tissues to slide towards the pressing plate 5. The limiting baffle 8 limits the facial tissues when they slide. After the pusher plate 4 is pushed into place, the facial tissues are located under the pressing plate 5. The hydraulic telescopic rod drives the pressing plate 5 to descend and press the facial tissues for the first time.

[0030] After the pressing plate 5 descends to perform the first pressing operation on the facial tissues, the feeding conveyor belt 6 conveys the facial tissues after the first pressing towards the feeding conveyor belt 7. During the conveying process, when the end of the stacked facial tissues reaches between the infrared transmitter 10 and the infrared receiver 11, it will block the infrared light, causing the signal received by the infrared receiver 11 to change, thus determining that the facial tissues have arrived. Once the end of the facial tissues is detected to have reached the set position, the servo motor starts and drives the drive gear 24 to rotate. When the drive gear 24 rotates, it meshes with the two driven gears 25 to drive the lead screw 21 and the lead screw 22 to rotate synchronously. Simultaneously, the electric push rod on the connecting frame 19 drives the guide plate 17 to descend to press down the stacked facial tissues near the end of the tissues. The feeding conveyor belt 27 starts and conveys the facial tissues. At the same time, the connecting frame 19 and the connecting frame 20 slide towards the middle position under the drive of the lead screw 11 and the lead screw 22. The facial tissues are conveyed forward with the cooperation of the feeding conveyor belt 27 and the two guide plates 17 on the connecting frame 19. During the conveying of the facial tissues, the hydraulic telescopic rod drives the mounting plate 9 to descend and drive the pressure roller 12 to press down the stacked facial tissues, so as to perform a second pressing operation on them during the feeding and conveying of the facial tissues.

[0031] When the two guide plates 17 press the facial tissue to the end of the connecting shaft 23 on the lead screw 21, the guide plate 18 moves to the end of the connecting shaft 23 on the lead screw 22. At this time, the electric push rod on the connecting frame 20 drives the guide plate 18 to descend and press near the end of the facial tissue to complete the handover with the guide plate 17. The guide plate 17 moves up to reset, and the servo motor drives the drive gear 24 to rotate in the opposite direction. The lead screw 22 and the lead screw 21 rotate and drive the connecting frame 20 and the connecting frame 19 to rotate in the opposite direction. The guide plate 18 presses the facial tissue and maintains the same conveying speed as the feeding conveyor belt 27 to move the facial tissue forward. When both the guide plates 17 and 18 have moved to their original positions, the above operation is repeated to complete the continuous alternating pressing of the facial tissue and the feeding conveyor belt 27 to convey the facial tissue.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pre-pressing device for a folding machine for producing facial tissues, comprising a folding machine (1), wherein a fixed frame (2) is provided on one side of the loading and unloading end of the folding machine (1), a loading conveyor belt (6) is movably mounted on the fixed frame (2), two movable seats (3) are symmetrically slidably mounted on the fixed frame (2), a pusher plate (4) is movably mounted between the two movable seats (3), a pressure plate (5) is movably mounted on the fixed frame (2), and a limit baffle (8) is fixedly mounted on the fixed frame (2), characterized in that: The fixed frame (2) is movably provided with a second material discharging conveying belt (7), the fixed frame (2) is provided with a double pressing mechanism comprising a mounting plate (9) and a paper pressing roller (12), and the fixed frame (2) is provided with an auxiliary pulling mechanism comprising a first paper guide plate (17) and a second paper guide plate (18); The mounting plate (9) is movably arranged on the fixed frame (2), the paper pressing roller (12) is rotatably arranged on the lower side of the mounting plate (9), the fixed frame (2) is fixedly provided with an infrared emitter (10), and the fixed frame (2) is fixedly provided with an infrared receiver (11) on the side opposite to the infrared emitter (10). The two first paper guide plates (17) are symmetrically slidably arranged on the fixed frame (2), the first paper guide plate (17) is arranged on the upper side of the second material discharging conveying belt (7), the two second paper guide plates (18) are symmetrically slidably arranged on the fixed frame (2), and the second paper guide plate (18) is arranged on the upper side of the second material discharging conveying belt (7).

2. The pre-press device of a folding machine for facial tissue production according to claim 1, characterized in that: The double pressing mechanism further comprises connecting barrels (14), the two connecting barrels (14) are fixedly arranged on the mounting plate (9), the connecting barrels (14) are slidably provided with movable columns (15), the connecting barrels (14) are fixedly provided with springs (16) in the interiors, one end of the spring (16) is fixedly connected with the movable column (15), and the paper pressing roller (12) is rotatably arranged between the two movable columns (15).

3. The pre-press device of a folding machine for facial tissue production according to claim 1, characterized in that: The double pressing mechanism further comprises positioning retaining rings (13), the two positioning retaining rings (13) are slidably arranged on the paper pressing roller (12), the paper pressing roller (12) is provided with adjusting holes, and the positioning retaining ring (13) is threadedly connected with the adjusting hole through bolts.

4. The pre-press device of a folding machine for facial tissue production according to claim 1, characterized in that: The auxiliary pulling mechanism further comprises connecting frames (19), the two connecting frames (19) are arranged on the sides away from each other of the two first paper guide plates (17), the first paper guide plate (17) is slidably arranged in the connecting frame (19), the two second paper guide plates (18) are provided with connecting frames (20) on the sides away from each other, the second paper guide plate (18) is slidably arranged in the connecting frame (20), the first paper guide plate (17) is provided with a first screw rod (21) on one side, the first screw rod (21) is rotatably arranged on the fixed frame (2), the second paper guide plate (18) is provided with a second screw rod (22) on one side, and the second screw rod (22) is rotatably arranged on the fixed frame (2).

5. The pre-press device of a folding machine for facial tissue production according to claim 4, characterized in that: The threads on the first screw rod (21) and the second screw rod (22) are opposite in rotation direction, the connecting frame (19) is fixedly provided with a sliding block, the sliding block is slidably arranged on the fixed frame (2), the sliding block is threadedly connected with the first screw rod (21), the connecting frame (20) is also fixedly provided with a sliding block, the sliding block on the connecting frame (20) is slidably arranged on the fixed frame (2), and the sliding block on the connecting frame (20) is threadedly connected with the second screw rod (22).

6. The pre-press device of a folding machine for facial tissue production according to claim 5, characterized in that: The auxiliary pulling mechanism further comprises a connecting shaft (23), the connecting shaft (23) is fixedly arranged on one end of the first screw rod (21) and the second screw rod (22), and the connecting shaft (23) is rotatably arranged on the fixed frame (2).

7. The pre-press device of a folding machine for facial tissue production according to claim 6, characterized in that: The auxiliary pulling mechanism further comprises driven gears (25), the driven gears (25) are arranged on one side of the screw rod one (21) and the screw rod two (22), the driven gears (25) are rotatably installed on the fixed frame (2), one of the driven gears (25) is fixedly connected with one end of the connecting shaft (23), the other driven gear (25) is fixedly connected with one end of the screw rod two (22), the driving gears (24) are rotatably arranged between two adjacent driven gears (25), the driving gears (24) are rotatably installed on the fixed frame (2), and the driving gears (24) are meshed with the two driven gears (25).

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