A delivery device

Abstract

The utility model provides a kind of conveying device, by setting up driving shaft, driven shaft and first belt, second belt and supporting plate of side by side arrangement;The one end of the driving shaft is connected with the one end of the driven shaft by the first belt, the other end of the driving shaft is connected with the other end of the driven shaft by the second belt;The supporting plate is located between the first belt and second belt, for supporting and guiding the material that first belt and second belt synchronous delivery carry out.The supporting plate between first belt and second belt, material can be supported and guided in the conveying process, avoid material deviation too much, improve the stability of material conveying.

Description

Technical Field

[0001] This utility model relates to the field of conveying equipment, and in particular to a conveying device. Background Technology

[0002] As a key piece of equipment in automated production lines, the design of conveying equipment directly affects material transfer efficiency and processing accuracy.

[0003] Currently, most existing conveying devices employ single-belt or intermittently designed double-belt structures. However, both suffer from poor conveying stability and a tendency for materials to deviate during transport. Single-belt systems rely on a single friction surface for positioning, making them susceptible to inertia and prone to deviation at high speeds. In contrast, the gap between the two belts in an intermittently designed double-belt structure forms a "mechanical collapse zone," where materials placed within this zone are prone to attitude deflection. This error is amplified with increasing conveying distance, further contributing to excessive material deviation. Furthermore, existing conveying devices suffer from problems such as difficult belt disassembly and replacement, complex processes, and a tendency for belt misalignment.

[0004] Therefore, there is an urgent need for a conveying device to improve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a conveying device that can support and guide materials during the conveying process, thereby improving the stability of material conveying.

[0006] In a first aspect, the present invention provides a conveying device, comprising a drive shaft, a driven shaft, and a first belt, a second belt, and a pallet arranged side by side;

[0007] One end of the drive shaft is connected to one end of the driven shaft via a first belt, and the other end of the drive shaft is connected to the other end of the driven shaft via a second belt;

[0008] The pallet is located between the first belt and the second belt and is used to support and guide the materials being conveyed synchronously by the first belt and the second belt.

[0009] Optionally, a first main pulley is fitted onto one end of the drive shaft, and a second main pulley is fitted onto the other end;

[0010] A first driven pulley is sleeved on one end of the driven shaft, and a second driven pulley is sleeved on the other end;

[0011] The first main pulley and the first driven pulley are connected by a first belt; the second main pulley and the second driven pulley are connected by a second belt.

[0012] Optionally, a power motor may also be included;

[0013] The output end of the power motor is connected to the drive shaft to drive the drive shaft to rotate; preferably, the power motor is built into the bottom of the first belt and the second belt, and the output end of the power motor is connected to the drive shaft through a synchronous belt; more preferably, the synchronous belt is disposed between the first main pulley and the second main pulley.

[0014] Optionally, the first belt has a limiting protrusion on the side near the first main pulley and the first driven pulley, and the first main pulley and the first driven pulley have a limiting groove in the middle that matches the limiting protrusion; and / or the second belt has a limiting protrusion on the side near the second main pulley and the second driven pulley, and the second main pulley and the second driven pulley have a limiting groove in the middle that matches the limiting protrusion.

[0015] Optionally, a housing may also be included;

[0016] The drive shaft, driven shaft, first belt, second belt, and support plate are located inside the housing;

[0017] The drive shaft is rotatably connected to the housing, and the driven shaft is fixedly connected to the housing. The first main pulley and the second main pulley sleeved on the drive shaft are fixedly connected to the drive shaft, and the first driven pulley and the second driven pulley sleeved on the driven shaft are rotatably connected to the driven shaft. The drive shaft is located at one end of the housing, and the driven shaft is located at the other end of the housing. Preferably, the housing is a detachable housing.

[0018] Optionally, the housing includes a first support side plate, a second support side plate, an outlet support plate, and an inlet support plate that are detachably connected; the first support side plate and the second support side plate are located on both sides of the tray, with the outlet support plate close to the driven shaft and the inlet support plate close to the drive shaft; preferably, the housing also includes a first connector, with both ends of the tray detachably connected to the housing via a first connector.

[0019] Optionally, the housing also includes a support beam, which is detachably connected to the housing; the support beam is disposed between the upper and lower opposing inner surfaces of the first belt or between the upper and lower opposing inner surfaces of the second belt, and the two do not contact each other; preferably, there are two support beams, one located inside the first belt and the other located inside the second belt; more preferably, the upper and lower surfaces of the support beam are respectively provided with receiving openings adapted to the limiting protrusion.

[0020] Optionally, there are two driven shafts. One driven shaft is connected to the other end of the first belt via a sleeved first driven pulley, and one end of the driven shaft is fixedly connected to the first support side plate, while the other end is fixedly connected to the third connecting member, which is detachably connected to the outlet support plate. The other driven shaft is connected to the other end of the second belt via a sleeved second driven pulley, and one end of the driven shaft is fixedly connected to the second support side plate, while the other end is fixedly connected to the second connecting member, which is detachably connected to the outlet support plate. Preferably, the first support side plate, the second support side plate, the second connecting member, and the third connecting member are all provided with strip-shaped through holes. The strip-shaped through holes on the second support side plate and the second connecting member are used to adjust the tension of the second belt. The strip-shaped through holes on the first support side plate and the third connecting member are used to adjust the tension of the first belt.

[0021] Optionally, the width of the pallet is one-third to two-thirds of the total width of the first belt and the second belt; preferably, the width of the pallet is one-half of the total width of the first belt and the second belt, and the widths of the first belt and the second belt are the same.

[0022] Optionally, the pallet is integrally formed or composed of at least two pallets spliced ​​together; preferably, two adjacent pallets are detachably connected by pallet connectors.

[0023] The beneficial effects of this invention are as follows: It comprises a drive shaft, a driven shaft, and a first belt, a second belt, and a support plate arranged side-by-side. One end of the drive shaft is connected to one end of the driven shaft via the first belt, and the other end of the drive shaft is connected to the other end of the driven shaft via the second belt. The support plate is located between the first and second belts and is used to support and guide the material being conveyed synchronously by the first and second belts. The support plate between the first and second belts can support and guide the material during conveying, preventing excessive material deviation and improving the stability of material conveying. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a conveying device provided in Embodiment 1 of this utility model;

[0025] Figure 2 for Figure 1 Exploded view;

[0026] Figure 3 This is a schematic diagram of the structure of one end of the drive shaft of a conveying device provided in Embodiment 1 of this utility model;

[0027] Figure 4 This is a schematic diagram of the driven shaft end of a conveying device provided in Embodiment 1 of this utility model;

[0028] Figure 5This is a schematic diagram of the installation of the outlet support plate and the first connecting member of a conveying device according to Embodiment 1 of this utility model;

[0029] Figure 6 This is a cross-sectional schematic diagram of the middle region of a conveying device provided in Embodiment 1 of this utility model;

[0030] Figure 7 This is a schematic diagram of the bottom structure of a conveying device provided in Embodiment 1 of this utility model;

[0031] Figure 8 This is a cross-sectional schematic diagram of the region where the driven shaft of a conveying device is located, as provided in Embodiment 1 of this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 131. First belt; 132. Second belt; 133. Power motor; 134. Housing; 135. Support plate; 136. Drive shaft; 137. Driven shaft; 138. First main pulley; 139. Second main pulley; 1310. First driven pulley; 1311. Second driven pulley; 1312. Second connecting piece; 1313. Third connecting piece; 1314. Strip-shaped through hole; 1315. Synchronous belt; 1316. Limiting protrusion; 1317. Limiting groove;

[0034] 134a, First supporting side plate; 134b, Second supporting side plate; 134c, Outlet support plate; 134d, Inlet support plate; 134e, First connector; 134f, Support beam; 134g, Pallet connector; 134f1, Reception opening. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0036] The technical solutions of the present utility model embodiments are described below with reference to the accompanying drawings. In the description of the embodiments of the present utility model, the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of the present utility model. The singular expressions "a," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present utility model, "at least one" and "one or more" refer to one or more (including two). The term "and / or" is used to describe the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0037] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," and "in still other embodiments" appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized. The term "connection" includes both direct and indirect connections, unless otherwise stated. "First" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0038] In the embodiments of this utility model, "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this utility model should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] <Example 1>

[0040] like Figure 1 , Figure 2As shown, this utility model provides a conveying device, including a drive shaft 136, a driven shaft 137, and a first belt 131, a second belt 132, and a support plate 135 arranged side by side in parallel. One end of the drive shaft 136 is connected to one end of the driven shaft 137 via the first belt 131, and the other end of the drive shaft 136 is connected to the other end of the driven shaft 137 via the second belt 132. The support plate 135 is located between the first belt 131 and the second belt 132, and is used to support and guide the material being conveyed synchronously by the first belt 131 and the second belt 132. When the drive shaft 136 drives the first belt 131 and the second belt 132 to move synchronously to convey the material, the support plate 135 located between the two belts supports and guides the material during the conveying process, preventing excessive material deviation and improving the stability of material conveying. The sides of the pallet 135, the first belt 131, and the second belt 132 that contact the material are at the same height and on the same horizontal plane. Furthermore, the sides of the pallet 135 are as close as possible to the first belt 131 and the second belt 132 to minimize the gap, but without causing friction between the pallet 135 and the first belt 131 or the second belt 132. Preferably, the gap between the side of the pallet 135 and the first belt 131 or the second belt 132 is 1-4 mm.

[0041] In order for the pallet 135 to guide the material and reduce material deviation during the conveying process, such as Figure 1 , Figure 2 As shown, the width of the pallet 135 is one-third to two-thirds of the total width of the first belt 131 and the second belt 132. In order to better guide the material and minimize the deviation of the material during the conveying process, in this embodiment, the width of the pallet 135 is half of the total width of the first belt 131 and the second belt 132, and the widths of the first belt 131 and the second belt 132 are the same.

[0042] The first belt 131 and the second belt 132 are made of the same material, and their outer surfaces (the side in contact with the material) have the same coefficient of friction. In order to ensure smooth material transportation, the upper surface (the side in contact with the material) of the pallet 135 also has the same coefficient of friction as the first belt 131 and the second belt 132.

[0043] like Figure 7 As shown, the pallet 135 is either integrally formed or assembled from at least two pallets 135. While integral forming improves the stability of the pallet 135, it increases processing difficulty when the pallet 135 is too long. In such cases, multiple pallets 135 can be processed separately and then assembled to adapt to different application scenarios. For ease of assembly, adjacent pallets 135 can be detachably connected via pallet connectors 134g. Preferably, the pallet connectors 134g are located on the bottom surfaces of two adjacent pallets and are detachably connected to each pallet via screws / bolts.

[0044] To improve the operational stability of the first belt 131 and the second belt 132, such as Figure 2-4 As shown, one end of the drive shaft 136 is fitted with a first main pulley 138, and the other end is fitted with a second main pulley 139; one end of the driven shaft 137 is fitted with a first driven pulley 1310, and the other end is fitted with a second driven pulley 1311. The first main pulley 138 and the first driven pulley 1310 are connected by a first belt 131, that is, one end of the first belt 131 is fitted onto the first main pulley 138, and the other end is fitted onto the first driven pulley 1310; the second main pulley 139 and the second driven pulley 1311 are connected by a second belt 132, that is, one end of the second belt 132 is fitted onto the second main pulley 139, and the other end is fitted onto the second driven pulley 1311.

[0045] To achieve automated conveying and improve conveying efficiency, such as Figure 1 As shown, the device also includes a power motor 133; the output end of the power motor 133 is connected to the drive shaft 136 and is used to drive the drive shaft 136 to rotate. To reduce the size of the conveying device, such as... Figure 1 and Figure 2 As shown, in some specific embodiments, the power motor 133 can also be placed below the lower surfaces of the first belt 131 and the second belt 132 as needed, and the output end of the power motor 133 is connected to the drive shaft 136 via a synchronous belt 1315. To improve the stability of the first belt 131 and the second belt 132 during transmission, such as... Figure 2 As shown, the synchronous belt 1315 is disposed between the first main pulley 138 and the second main pulley 139.

[0046] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the first belt 131 has a limiting protrusion 1316 at the center of its inner surface near the first master pulley 138 and the first driven pulley 1310. The first master pulley 138 and the first driven pulley 1310 have a limiting groove 1317 at their center, which matches the size and shape of the limiting protrusion 1316. The limiting groove 1317 is slightly larger than the limiting protrusion 1316, and the limiting protrusion 1316 is located within the limiting groove 1317. The two are fitted together with a clearance to prevent belt misalignment. The second belt 132 also has a limiting protrusion 1316 at the center of its inner surface near the second master pulley 139 and the second driven pulley 1311. The second master pulley 139 and the second driven pulley 1311 have a limiting groove 1317 at their center, which matches the size and shape of the limiting protrusion 1316. In some embodiments, the limiting protrusion 1316 may not be provided on the first belt 131 and the second belt 132. For example, Figure 8 As shown, the pulley is cylindrical, and the outer surface of the cylinder is recessed inward to form an annular limiting groove 1317, which is located in the middle of the cylinder.

[0047] like Figure 1 As shown, the device also includes a housing 134. A drive shaft 136, a driven shaft 137, a first belt 131, a second belt 132, and a support plate 135 are located within the housing 134. The drive shaft 136 is rotatably connected to the housing 134, and the driven shaft 137 is fixedly connected to the housing 134. A first main pulley 138 and a second main pulley 139 mounted on the drive shaft 136 are fixedly connected to the drive shaft 136. A first driven pulley 1310 and a second driven pulley 1311 mounted on the driven shaft are rotatably connected to the driven shaft. The drive shaft 136 is located at one end of the housing 134, and the driven shaft 137 is located at the other end of the housing 134. It is worth noting that the fixed connection between the first main pulley 138 and the second main pulley 139 and the drive shaft 136 does not mean that they are not detachable. Rather, it means that when the power motor 133 drives the drive shaft 136 to rotate via the synchronous belt 1315, the first main pulley 138 and the second main pulley 139 will not rotate relative to the drive shaft 136. However, during this process, the first driven pulley 1310 and the second driven pulley 1311 will rotate relative to the driven shaft 137, but the driven shaft 137 will not rotate relative to the housing 134.

[0048] The housing 134 is detachable, such as Figure 1 , Figure 2 and Figure 4 As shown, the housing 134 includes a first support side plate 134a, a second support side plate 134b, an outlet support plate 134c, and an inlet support plate 134d, which are detachably connected (e.g., by threaded, snap-fit, or other detachable connection methods). The first support side plate 134a and the second support side plate 134b are located on both sides of the support plate 135. The outlet support plate 134c is close to the driven shaft 137, and the inlet support plate 134d is close to the drive shaft 136. Figure 5 As shown, to improve the stability of the connection between the pallet 135 and the housing 134, the housing 134 further includes a first connecting member 134e. Both ends of the pallet 135 are detachably connected to the outlet support plate 134c and the inlet support plate 134d of the housing 134 via a first connecting member 134e, respectively. The first connecting member 134e connected to the inlet support plate 134d has an opening for the drive shaft 136 to pass through. It is worth noting that the two first connecting members 134e located at both ends of the pallet 135 can have different or the same shape.

[0049] like Figure 6As shown, to improve the stability of the housing connection, the housing 134 also includes a support beam 134f. The two ends of the support beam 134f are detachably connected to the outlet support plate 134c and the inlet support plate 134d, respectively. The number of support beams 134f can be one or two. When there is only one support beam 134f, it can be positioned between the upper and lower opposing inner surfaces of the first belt 131, without contact between them; or it can be positioned between the upper and lower opposing inner surfaces of the second belt 132, without contact between them. Figure 4 and Figure 6 When there are two supporting beams 134f, one is located between the upper and lower opposing inner surfaces of the first belt 131, and the other is located between the upper and lower opposing inner surfaces of the second belt 132; one end of one supporting beam 134f is detachably connected to the second connecting member 1312, and one end of the other supporting beam 134f is connected to one end of the third connecting member 1313, and the side of the supporting beam 134f is detachably connected to its adjacent frame. Figure 6 As shown, the upper and lower surfaces of the supporting beam 134f are respectively provided with receiving openings 134f1 that are adapted to the limiting protrusion 1316 to prevent friction with the limiting protrusion 1316.

[0050] To facilitate adjusting the tension of the first belt 131 and the second belt 132 respectively, such as Figure 4 As shown, there are two driven shafts 137. One driven shaft 137 is connected to the other end of the first belt 131 via a sleeved first driven pulley 1310. One end of the driven shaft 137 is fixedly connected to the first support side plate 134a, and the other end is fixedly connected to the third connecting member 1313. The third connecting member 1313 is detachably connected to the outlet support plate 134c. The other driven shaft 137 is connected to the other end of the second belt 132 via a sleeved second driven pulley 1311. One end of the driven shaft 137 is fixedly connected to the second support side plate 134b, and the other end is fixedly connected to the second connecting member 1312. The second connecting member 1312 is detachably connected to the outlet support plate 134c. Figure 4As shown, the first support side plate 134a, the second support side plate 134b, the second connector 1312, and the third connector 1313 are all provided with strip-shaped through holes 1314; the strip-shaped through holes 1314 on the second support side plate 134b and the second connector 1312 are used to adjust the tension of the second belt 132; the strip-shaped through holes 1314 on the first support side plate 134a and the third connector 1313 are used to adjust the tension of the first belt 131, specifically by adjusting the driven shaft in the strip-shaped through holes 1314. The position of the driven shaft in the through hole 1314 (e.g., adjusting the position of the driven shaft in the strip through hole 1314 forward or backward along the belt transmission direction) is used to adjust the tension of the first belt 131 and / or the second belt 132. The driven shaft 137 is fixed in the strip through hole 1314 by a nut. During the conveying process, the driven shaft itself will not rotate relative to the strip through hole 1314, while the first driven pulley 1311 and the second driven pulley 1312 sleeved on the driven shaft will rotate relative to the driven shaft.

[0051] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A conveying device, characterized in that, It includes a drive shaft, a driven shaft, and a first belt, a second belt, and a support plate arranged side by side; One end of the drive shaft is connected to one end of the driven shaft via the first belt, and the other end of the drive shaft is connected to the other end of the driven shaft via the second belt; The pallet is located between the first belt and the second belt and is used to support and guide the materials being conveyed synchronously by the first belt and the second belt.

2. The apparatus according to claim 1, characterized in that, The width of the pallet is one-third to two-thirds of the total width of the first and second belts.

3. The apparatus according to claim 2, characterized in that, The width of the pallet is half the total width of the first belt and the second belt, and the widths of the first belt and the second belt are the same.

4. The apparatus according to any one of claims 1-3, characterized in that, The pallet is either integrally formed or composed of at least two pallets joined together.

5. The apparatus according to claim 4, characterized in that, Adjacent pallets are detachably connected via pallet connectors.

6. The apparatus according to claim 1, characterized in that, One end of the drive shaft is fitted with a first main pulley, and the other end is fitted with a second main pulley; One end of the driven shaft is fitted with a first driven pulley, and the other end is fitted with a second driven pulley; The first main pulley and the first driven pulley are connected by the first belt; the second main pulley and the second driven pulley are connected by the second belt.

7. The apparatus according to claim 6, characterized in that, It also includes the power motor; The output end of the power motor is connected to the drive shaft and is used to drive the drive shaft to rotate.

8. The apparatus according to claim 7, characterized in that, The power motor is built into the bottom of the first belt and the second belt, and the output end of the power motor is connected to the drive shaft through a synchronous belt.

9. The apparatus according to claim 8, characterized in that, The timing belt is positioned between the first main pulley and the second main pulley.

10. The apparatus according to claim 6, characterized in that, The first belt has a limiting protrusion on the side near the first main pulley and the first driven pulley in the middle, and a limiting groove adapted to the limiting protrusion is provided in the middle of the first main pulley and the first driven pulley; the second belt has a limiting protrusion on the side near the second main pulley and the second driven pulley in the middle, and a limiting groove adapted to the limiting protrusion is provided in the middle of the second main pulley and the second driven pulley.

11. The apparatus according to claim 10, characterized in that, It also includes the casing; The drive shaft, driven shaft, first belt, second belt, and support plate are located inside the housing; The drive shaft is rotatably connected to the housing, and the driven shaft is fixedly connected to the housing. The first main pulley and the second main pulley sleeved on the drive shaft are fixedly connected to the drive shaft, and the first driven pulley and the second driven pulley sleeved on the driven shaft are rotatably connected to the driven shaft. The drive shaft is located at one end of the housing, and the driven shaft is located at the other end of the housing.

12. The apparatus according to claim 11, characterized in that, The housing is a detachable housing.

13. The apparatus according to claim 12, characterized in that, The housing includes a first support side plate, a second support side plate, an outlet support plate, and an inlet support plate that are detachably connected; the first support side plate and the second support side plate are located on both sides of the tray, the outlet support plate is close to the driven shaft, and the inlet support plate is close to the drive shaft.

14. The apparatus according to claim 13, characterized in that, The housing also includes a first connector. The two ends of the support plate are detachably connected to the outlet support plate and the inlet support plate of the housing through the first connector, respectively. The first connector connected to the inlet support plate has an opening for the drive shaft to pass through.

15. The apparatus according to claim 14, characterized in that, The housing also includes a support beam, which is detachably connected to the housing; the support beam is disposed between the upper and lower opposing inner surfaces of the first belt or between the upper and lower opposing inner surfaces of the second belt, and the two do not contact each other.

16. The apparatus according to claim 15, characterized in that, The support beam has two parts, one of which is located inside the first belt and the other is located inside the second belt; the upper and lower surfaces of the support beam are respectively provided with receiving openings that are adapted to the limiting protrusion.

17. The apparatus according to claim 13, characterized in that, Two driven shafts are provided. One driven shaft is connected to the other end of the first belt through a first driven pulley, and one end of the driven shaft is fixedly connected to the first support side plate, and the other end is fixedly connected to a third connecting member. The third connecting member is detachably connected to the outlet support plate. The other driven shaft is connected to the other end of the second belt through a second driven pulley, and one end of the driven shaft is fixedly connected to the second support side plate, and the other end is fixedly connected to a second connecting member. The second connecting member is detachably connected to the outlet support plate.

18. The apparatus according to claim 17, characterized in that, The first support side plate, the second support side plate, the second connector, and the third connector are all provided with strip-shaped through holes; the strip-shaped through holes on the second support side plate and the second connector are used to adjust the tension of the second belt; the strip-shaped through holes on the first support side plate and the third connector are used to adjust the tension of the first belt.

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