Anti-deviation material conveying track of automatic equipment

Abstract

The utility model is suitable for the technical field of material conveying, and provides an automatic equipment anti-deviation material conveying track which comprises two fixing cylinders. Movable cylinders are slidably mounted on the inner sides of the two fixed cylinders, and one ends of the two movable cylinders extend out of the two fixed cylinders respectively; one ends of the two fixed cylinders are fixedly connected with a fixed box; and two threaded rods are rotatably mounted on the inner side of the fixed box, the two threaded rods are located in the two fixed cylinders correspondingly, and one ends of the two threaded rods extend to the inner sides of the two movable cylinders correspondingly and are in threaded connection with the movable cylinders. According to the anti-deviation material conveying rail of the automatic equipment, the downwards-sunken angle of the top of the conveying belt is utilized, materials can be gathered to the middle during conveying, the situation that the materials deviate during conveying is avoided, the state of the top of the conveying belt can be conveniently adjusted according to the material conveying requirement, and the conveying efficiency is improved. The elevation angle of the conveying belt can be adjusted and controlled, and the material conveying height can be adjusted and controlled conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of material conveying technology, and in particular relates to an automated equipment anti-deviation material conveying track. Background Technology

[0002] Material handling is a crucial part of industrial production, involving the efficient and safe movement of raw materials, semi-finished products, or finished products from one location to another. When transporting materials to another location, rails are used for material handling.

[0003] Chinese patent discloses a material conveying track for a belt conveyor, publication number CN212892255U. The paper states that it "includes a feeding box, with a drive roller mounted inside the feeding box via bearings, and a driven roller mounted inside the feeding box on the side away from the drive roller via bearings. A conveyor belt is mounted on the surfaces of the drive roller and the driven roller. A first motor is fixedly connected to the bottom of the feeding box, a motor housing is mounted on the side wall of the feeding box, a second motor is mounted inside the motor housing, and multiple transmission rods are mounted inside the feeding box and between the drive roller and the driven roller via bearings. A fifth gear is fixedly connected to the surface of each transmission rod, a support plate is mounted between the fifth gears, and multiple support tracks are mounted on the inner side wall of the feeding box."

[0004] However, the above scheme is not convenient for adjusting and controlling the degree of concavity of the material conveying track, is not convenient for preventing material deviation during conveying, and is not convenient for adjusting the elevation angle of the material conveying track or the height of the material conveying. Utility Model Content

[0005] This utility model provides an anti-deviation material conveying track for automated equipment, aiming to solve the problem that some currently used material conveying tracks are inconvenient to adjust the concave angle and convex angle of the conveyor belt.

[0006] This utility model is implemented as follows: an automated equipment anti-deviation material conveying track includes two fixed cylinders; movable cylinders are slidably installed on the inner sides of both fixed cylinders, and two fixed cylinders extend from one end of each of the two movable cylinders; a fixed box is fixedly connected to one end of each of the two fixed cylinders; two threaded rods are rotatably installed on the inner side of the fixed box, each threaded rod being located inside the two fixed cylinders, and one end of each threaded rod extending to the inner side of the two movable cylinders and threadedly connected to them; a movable frame is movably connected to the top of the fixed box, and one end of the movable frame extends above the movable cylinders; a support column is movably installed between the top of each movable cylinder and the movable frame; a support plate is fixedly connected to one end of each of the two movable cylinders, and the top of the support plate is in contact with the bottom of the movable frame; two conveying rollers are rotatably installed on the inner side of the movable frame, and the two conveying rollers are located at both ends of the movable frame; A conveyor belt is rotatably connected to the periphery of each conveyor roller; two movable rods are slidably installed on the inner side of the movable frame, both of which are located inside the conveyor belt; two bidirectional screws are rotatably installed on the inner side of the movable frame, both of which pass through the two movable rods and are threadedly connected to them; multiple movable columns are movably connected to the top of each movable rod, and the multiple movable columns are arranged in a front-to-back arrangement; a support frame is movably installed on the top of every two movable columns; a shaft frame is fixedly installed on the top of each support frame; fixed rods are movably installed on the front and rear sides of each shaft frame, and the outer ends of the multiple fixed rods are inclined upwards; a limiting frame is fixedly installed on the outer end of each fixed rod, and each limiting frame is movably connected to the top of the movable frame; a support roller is rotatably installed on the periphery of each fixed rod, and the multiple support rollers provide rolling support for the conveyor belt.

[0007] Preferably, the movable frame and the fixed box are movably connected by two bearings, and a first motor is fixedly installed on one side of the fixed box. The output end of the first motor is fixedly connected to the shaft of a threaded rod.

[0008] Preferably, a second motor is fixedly installed on the front side of the movable frame, and the output end of the second motor is fixedly connected to the shaft of a conveying roller.

[0009] Preferably, a turntable is fixedly mounted at the front end of one of the bidirectional screws, and the turntable extends to the front side of the movable frame.

[0010] Preferably, the two bidirectional screws are rotatably connected by a first belt, which is located in front of the movable rod.

[0011] Preferably, two fixed frames are fixedly installed on the inner side of the movable frame, and the two ends of the two movable rods extend to the inner side of the two fixed frames and are slidably connected to the fixed frames.

[0012] Preferably, two threaded sleeves are fixedly installed on the inner side of each movable rod, and each movable rod is threadedly connected to the two bidirectional screws through the two threaded sleeves respectively.

[0013] Preferably, a plurality of limiting rods are fixedly installed on the top of the movable frame, and each limiting frame is located outside a limiting rod and is movably connected to the limiting rod.

[0014] Preferably, a toothed ring is fixedly installed on the top of each of the two movable columns, and the two toothed rings mesh with each other.

[0015] Preferably, a support rod is fixedly installed between the two fixed cylinders, and the two threaded rods are rotatably connected by a second belt located inside the fixed box.

[0016] Compared with related technologies, the automated equipment anti-deviation material conveying track provided by this utility model has the following beneficial effects:

[0017] 1. First, by rotating the conveyor rollers, the conveyor belt is supported by the rolling motion of the conveyor rollers, causing the top of the conveyor belt to move to the right. The material to be conveyed is placed on top of the conveyor belt, which then transports the material. The downward concave angle of the top of the conveyor belt helps to gather the material towards the center, preventing deviation during transport. By rotating the bidirectional screw in opposite directions, and using the threaded connection between the movable rod and the bidirectional screw, the two movable rods can be moved together or apart. Moving the two movable rods together can move the two opposing movable columns at opposite ends. The bottom moves in a closing motion, causing the top of the movable column to push the support frame upward, simultaneously driving the shaft frame upward. The shaft frame then drives one end of the fixed rod upward, simultaneously pushing the top center position of the conveyor belt upward. This also pushes the top of the conveyor belt to a horizontal position. By driving the two movable rods to separate, the two opposing movable columns at the front and rear also separate, causing the movable columns to drive the support frame downward. Simultaneously, one end of the fixed rod flips downward, facilitating the adjustment and control of the support roller angle and the degree of concavity at the top of the conveyor belt. This allows for convenient adjustment of the state of the top of the conveyor belt according to material conveying requirements.

[0018] 2. By rotating the threaded rod in both directions, and with one end of the movable cylinder threadedly connected to the threaded rod, the threaded rod can drive the movable cylinder to move left and right during rotation. This allows the movable cylinder to contract or extend along the fixed cylinder. Contraction of the movable cylinder along the fixed cylinder moves the bottom of the support column to the left, causing the top of the support column to push the movable frame upward along the shaft seat. Extension of the movable cylinder along the fixed cylinder moves the bottom of the support column to the right, causing the top of the support column to drive the movable frame downward to reset. The movable frame can synchronously rotate the conveyor belt, allowing for adjustment and control of the conveyor belt's elevation angle and material conveying height. Upward rotation of the movable frame and conveyor belt moves the movable cylinder to the left, extending one end of the movable frame and conveyor belt above the material conveying position. Downward rotation of the movable frame and conveyor belt moves the movable cylinder to the right, increasing the support range and making material conveying more stable. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a cross-sectional view of the movable frame structure of this utility model;

[0021] Figure 3 This is a side sectional view of the movable frame of this utility model;

[0022] Figure 4 For the present utility model Figure 3 Enlarged structural diagram of section A;

[0023] Figure 5 This is a partial side view sectional diagram of the movable frame of this utility model;

[0024] Figure 6 For the present utility model Figure 5 Enlarged structural diagram of section B;

[0025] Figure 7 This is a front sectional view of the fixed cylinder and the movable cylinder of this utility model;

[0026] Figure 8 For the present utility model Figure 7 Enlarged structural diagram of section C;

[0027] Figure 9 For the present utility model Figure 7 Enlarged structural diagram of section D.

[0028] In the diagram: 1. Fixed cylinder; 2. Movable cylinder; 3. Fixed box; 4. Shaft seat; 5. First motor; 6. Support plate; 7. Support column; 8. Movable frame; 9. Conveyor roller; 10. Second motor; 11. Conveyor belt; 12. Turntable; 13. Fixed frame; 14. Movable rod; 15. Bidirectional screw; 16. First belt; 17. Threaded sleeve; 18. Movable column; 19. Shaft frame; 20. Fixed rod; 21. Support roller; 22. Limiting frame; 23. Limiting rod; 24. Gear ring; 25. Support frame; 26. Support rod; 27. Threaded rod; 28. Second belt. Detailed Implementation

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] Example 1

[0032] A preferred embodiment of the automated equipment anti-deviation material conveying track provided by this utility model is, for example... Figures 1 to 9As shown: An automated equipment anti-deviation material conveying track includes two fixed cylinders 1; movable cylinders 2 are slidably installed on the inner sides of both fixed cylinders 1, and one end of each movable cylinder 2 extends out of the two fixed cylinders 1; a fixed box 3 is fixedly connected to one end of each fixed cylinder 1; two threaded rods 27 are rotatably installed on the inner side of the fixed box 3, each threaded rod 27 is located inside the two fixed cylinders 1, and one end of each threaded rod 27 extends to the inner side of the two movable cylinders 2 and is threadedly connected to the movable cylinders 2; a movable frame 8 is movably connected to the top of the fixed box 3, and one end of the movable frame 8 extends above the movable cylinders 2; a support column 7 is movably installed between the top of each movable cylinder 2 and the movable frame 8; a support plate 6 is fixedly connected to one end of each movable cylinder 2, and the top of the support plate 6 is in contact with the bottom of the movable frame 8; two conveying rollers 9 are rotatably installed on the inner side of the movable frame 8, and the two conveying rollers 9 are located at both ends of the movable frame 8; and two conveying rollers 9 are rotatably connected to the outer periphery of the two conveying rollers 9. A conveyor belt 11 is provided. Two movable rods 14 are slidably installed on the inner side of the movable frame 8, both of which are located inside the conveyor belt 11. Two bidirectional screws 15 are rotatably installed on the inner side of the movable frame 8, both of which pass through the two movable rods 14 and are threadedly connected to them. Multiple movable columns 18 are movably connected to the top of each movable rod 14, and the multiple movable columns 18 are arranged in a front-to-back arrangement. A support frame 25 is movably installed on the top of every two movable columns 18. A shaft frame 19 is fixedly installed on the top of each support frame 25. Fixed rods 20 are movably installed on the front and rear sides of each shaft frame 19, and the outer ends of the multiple fixed rods 20 are inclined upwards. A limiting frame 22 is fixedly installed on the outer end of each fixed rod 20, and each limiting frame 22 is movably connected to the top of the movable frame 8. A support roller 21 is rotatably installed on the periphery of each fixed rod 20, and the multiple support rollers 21 provide rolling support for the conveyor belt 11.

[0033] It should be noted that some existing automated equipment anti-deviation material conveying tracks still have certain shortcomings in actual use, making it inconvenient to adjust and control the depth of the indentation at the top of the conveyor belt 11 according to the material conveying requirements.

[0034] In this embodiment, the conveyor roller 9 is first rotated to provide rolling support for the conveyor belt 11, causing the top of the conveyor belt 11 to move to the right. The material to be conveyed is placed on top of the conveyor belt 11, which then transports the material. The downward concave angle of the top of the conveyor belt 11 helps to gather the material towards the center, preventing deviation during transport. The bidirectional screw 15 is rotated in opposite directions, and the threaded connection between the movable rod 14 and the bidirectional screw 15 allows for separation or merging of the two movable rods 14. By moving the two movable rods 14 together, the bottoms of the two opposing movable columns 18 can be moved together, causing the tops of the movable columns 18 to push the support frame 25 upward, simultaneously moving the shaft frame 19 upward. The shaft frame 19 then moves one end of the fixed rod 20 upward, simultaneously pushing the top center of the conveyor belt 11 upward, and simultaneously pushing the top of the conveyor belt 11 to a horizontal position. By moving the two movable rods 14 apart, the two opposing movable columns 18 can be moved apart, causing the movable columns 18 to move the support frame 25 downward, simultaneously causing one end of the fixed rod 20 to rotate downward, facilitating... The angle of the support roller 21 is adjusted and controlled, and the degree of concavity at the top of the conveyor belt 11 is adjusted and controlled simultaneously. This allows for convenient adjustment of the state of the top of the conveyor belt 11 according to material conveying requirements. By driving the threaded rod 27 to rotate in both directions, and by using one end of the movable cylinder 2 to be threadedly connected to the threaded rod 27, the threaded rod 27 can drive the movable cylinder 2 to move left and right when rotating in both directions. This causes the movable cylinder 2 to contract or extend along the fixed cylinder 1. By driving the movable cylinder 2 to contract along the fixed cylinder 1, the movable cylinder 2 can drive the bottom end of the support column 7 to move to the left, causing the top end of the support column 7 to push the movable frame 8 to flip upward. The moving cylinder 2 extends along the fixed cylinder 1, which can drive the bottom end of the support column 7 to move to the right, causing the top end of the support column 7 to drive the movable frame 8 to flip downward and reset. The movable frame 8 can drive the conveyor belt 11 to flip synchronously, and the elevation angle of the conveyor belt 11 can be adjusted and controlled, which can facilitate the adjustment and control of the material conveying height. When the movable frame 8 and the conveyor belt 11 are flipped upward, the moving cylinder 2 can be moved to the left, which makes it easier to extend one end of the movable frame 8 and the conveyor belt 11 above the material conveying position. When the movable frame 8 and the conveyor belt 11 are flipped downward, the moving cylinder 2 can be moved to the right, increasing the support range and making the material conveying more stable.

[0035] In a further preferred embodiment of the present invention, the movable frame 8 and the fixed box 3 are movably connected by two bearings 4. A first motor 5 is fixedly installed on one side of the fixed box 3, and the output end of the first motor 5 is fixedly connected to the shaft of a threaded rod 27.

[0036] In this embodiment, the movable frame 8 can be supported by the bearing seat 4, and the movable frame 8 can be flipped up and down. The first motor 5 can drive a threaded rod 27 to rotate in both directions.

[0037] In a further preferred embodiment of the present invention, a second motor 10 is fixedly installed on the front side of the movable frame 8, and the output end of the second motor 10 is fixedly connected to the shaft of a conveying roller 9.

[0038] In this embodiment, the second motor 10 can easily drive a conveyor roller 9 to rotate.

[0039] In a further preferred embodiment of the present invention, a turntable 12 is fixedly installed at the front end of a bidirectional screw 15, and the turntable 12 extends to the front side of the movable frame 8.

[0040] In this embodiment, the turntable 12 facilitates the rotation of the bidirectional screw 15.

[0041] Example 2

[0042] Based on Embodiment 1, a preferred embodiment of the automated equipment anti-deviation material conveying track provided by this utility model is, for example... Figures 1 to 9 As shown: the two bidirectional screws 15 are rotatably connected by a first belt 16, which is located in front of the movable rod 14.

[0043] In this embodiment, the two bidirectional screws 15 are driven by the first belt 16, so that when one bidirectional screw 15 rotates, it drives the other bidirectional screw 15 to rotate synchronously.

[0044] In a further preferred embodiment of the present invention, two fixed frames 13 are fixedly installed on the inner side of the movable frame 8, and the two ends of the two movable rods 14 extend to the inner side of the two fixed frames 13 and are slidably connected to the fixed frames 13.

[0045] In this embodiment, the movable rod 14 can be supported by the fixed frame 13, and the movable rod 14 can be moved back and forth easily.

[0046] In a further preferred embodiment of the present invention, two threaded sleeves 17 are fixedly installed on the inner side of each movable rod 14, and each movable rod 14 is threadedly connected to the two bidirectional screws 15 through the two threaded sleeves 17.

[0047] In this embodiment, by engaging the threaded sleeve 17 with the bidirectional screw 15, the bidirectional screw 15 can drive the movable rod 14 to move back and forth when rotating.

[0048] In a further preferred embodiment of the present invention, a plurality of limiting rods 23 are fixedly installed on the top of the movable frame 8, and each limiting frame 22 is located outside a limiting rod 23 and is movably connected to the limiting rod 23.

[0049] In this embodiment, when one end of the fixing rod 20 moves upward, the other end of the fixing rod 20 can push the limiting frame 22 to slide outward along the limiting rod 23. When one end of the fixing rod 20 moves downward, the other end of the fixing rod 20 can drive the limiting frame 22 to slide inward along the limiting rod 23.

[0050] In a further preferred embodiment of the present invention, toothed rings 24 are fixedly installed on the top of each of the two movable columns 18, and the two toothed rings 24 mesh with each other.

[0051] In this embodiment, the toothed ring 24 can enable the two movable columns 18 to push the support frame 25 to move upward stably.

[0052] In a further preferred embodiment of the present invention, a support rod 26 is fixedly installed between the two fixed cylinders 1, and the two threaded rods 27 are rotatably connected by a second belt 28, which is located inside the fixed box 3.

[0053] In this embodiment, the support rod 26 can support and fix the two fixed cylinders 1, and the second belt 28 can drive the other threaded rod 27 to rotate synchronously when the first threaded rod 27 rotates.

[0054] In summary, by moving the movable cylinder 2 left and right, one end of the support column 7 can move left and right synchronously, causing the other end of the support column 7 to drive the movable frame 8 to flip up or down, and simultaneously drive the conveyor belt 11 to flip up and down, thus allowing for adjustment and control of the height position of the material conveying.

[0055] It is worth noting that the circuits, electronic components, and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0056] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0057] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. An anti-deviation material conveying track for automated equipment, characterized in that, include: Two fixed cylinders (1); Movable cylinders (2) are slidably installed on the inner side of both fixed cylinders (1), and two fixed cylinders (1) extend from one end of each of the two movable cylinders (2); A fixed box (3) is fixedly connected to one end of each of the two fixed cylinders (1); Two threaded rods (27) are rotatably installed on the inner side of the fixed box (3). The two threaded rods (27) are located inside the two fixed cylinders (1) respectively. One end of the two threaded rods (27) extends to the inner side of the two movable cylinders (2) and is threadedly connected to the movable cylinders (2). The top of the fixed box (3) is movably connected to a movable frame (8), one end of which extends above the movable cylinder (2); Each of the movable cylinders (2) has a support column (7) movably installed between its top and the movable frame (8); One end of each of the two movable cylinders (2) is fixedly connected to a support plate (6), and the top of the support plate (6) is in contact with the bottom of the movable frame (8); Two conveying rollers (9) are rotatably mounted on the inner side of the movable frame (8), and the two conveying rollers (9) are located at both ends of the movable frame (8); A conveyor belt (11) is rotatably connected to the periphery of the two conveyor rollers (9); Two movable rods (14) are slidably installed on the inner side of the movable frame (8), and both movable rods (14) are located inside the conveyor belt (11); Two bidirectional screws (15) are rotatably installed on the inner side of the movable frame (8). Both bidirectional screws (15) pass through the two movable rods (14) and are threadedly connected to the movable rods (14). Each of the movable rods (14) is movably connected to a plurality of movable columns (18) at its top, and the plurality of movable columns (18) are arranged in a front-to-back arrangement; A support frame (25) is movably mounted on the top of each pair of movable columns (18); Each of the support frames (25) has a shaft bracket (19) fixedly mounted on its top; Each of the aforementioned shaft brackets (19) has a fixing rod (20) movably installed on its front and rear sides, and the outer ends of the plurality of fixing rods (20) are inclined upwards; Each of the fixed rods (20) has a limiting frame (22) fixedly installed at its outer end, and each limiting frame (22) is movably connected to the top of the movable frame (8); Each of the fixed rods (20) is rotatably mounted with a support roller (21) on its periphery, and the plurality of support rollers (21) provide rolling support for the conveyor belt (11).

2. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, The movable frame (8) and the fixed box (3) are movably connected by two bearings (4). A first motor (5) is fixedly installed on one side of the fixed box (3), and the output end of the first motor (5) is fixedly connected to the shaft of a threaded rod (27).

3. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, A second motor (10) is fixedly installed on the front side of the movable frame (8), and the output end of the second motor (10) is fixedly connected to the shaft of a conveying roller (9).

4. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, A turntable (12) is fixedly mounted on the front end of one of the bidirectional screws (15), the turntable (12) extending to the front side of the movable frame (8).

5. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, The two bidirectional screws (15) are rotatably connected by a first belt (16), which is located in front of the movable rod (14).

6. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, Two fixed frames (13) are fixedly installed on the inner side of the movable frame (8), and the two ends of the two movable rods (14) extend to the inner side of the two fixed frames (13) and are slidably connected to the fixed frames (13).

7. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, Two threaded sleeves (17) are fixedly installed on the inner side of each of the movable rods (14), and each of the movable rods (14) is threadedly connected to the two bidirectional screws (15) through the two threaded sleeves (17).

8. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, The top of the movable frame (8) is fixedly equipped with multiple limiting rods (23), and each limiting frame (22) is located outside a limiting rod (23) and is movably connected to the limiting rod (23).

9. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, The top of each of the two movable columns (18) is fixedly fitted with a toothed ring (24), and the two toothed rings (24) mesh with each other.

10. The automated equipment anti-deviation material conveying track as described in claim 1, characterized in that, A support rod (26) is fixedly installed between the two fixed cylinders (1), and the two threaded rods (27) are rotatably connected by a second belt (28), which is located inside the fixed box (3).

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