Tensioning device of chain transmission mechanism

Abstract

The utility model discloses a tensioning device of a chain type transmission mechanism. The tensioning device comprises a tensioning support, the swing rod is connected to the tensioning support in a pivoted mode through a pivot shaft, and the end, away from the pivot shaft, of the swing rod is connected with a chain wheel through a supporting shaft. The elastic piece is connected between the tensioning support and the swing rod and is suitable for providing acting force around the pivotal shaft for the swing rod; the distance between the connecting point of the elastic piece on the swing rod and the pivot shaft is smaller than the distance between the supporting shaft and the pivot shaft. The tensioning device is simple in structure, reliable in tensioning and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of chain drive, in particular to a tensioning device for a chain drive mechanism. Background Art

[0002] A chain transportation device usually includes a frame, a driving mechanism, a chain and a transmission mechanism composed of two sprockets. During the operation of the chain, poor tensioning will cause problems such as running creep. Therefore, in order to ensure the reliable transmission of the chain, a tensioning mechanism is installed on one side of the sprocket.

[0003] The existing tensioning mechanisms include a manual tensioning mechanism and an automatic tensioning mechanism. Among them, the manual tensioning mechanism is mainly composed of a support plate and a bolt group. By adjusting the length of the bolt group, the sprocket rotating shaft can be driven to translate, and thus the tension of the chain can be adjusted. However, this manual tensioning adjustment method requires staff to regularly check the chain on site, and the manual adjustment method is relatively cumbersome. The automatic tensioning mechanism usually uses a power execution component such as a cylinder to realize the movement of the sprocket rotating shaft, and the tensioning mechanism occupies a large space and has a high use and maintenance cost. Summary of the Utility Model

[0004] Therefore, the utility model provides a tensioning device for a chain drive mechanism with a simple structure and low cost.

[0005] In view of the above technical problems, the utility model provides the following technical solutions:

[0006] A tensioning device for a chain drive mechanism includes: a tensioning bracket; a swing rod pivotally connected to the tensioning bracket through a pivot shaft, and one end of the swing rod away from the pivot shaft is connected to a sprocket through a support shaft; an elastic member connected between the tensioning bracket and the swing rod, adapted to provide a force to the swing rod around the pivot shaft; wherein, the distance from the connection point of the elastic member on the swing rod to the pivot shaft is less than the distance from the support shaft to the pivot shaft.

[0007] In some embodiments of the utility model, a limiting portion for limiting the maximum swing position of the swing rod is provided on the tensioning bracket, the limiting portion includes a first limiting portion and a second limiting portion, and the swing rod is located between the first limiting portion and the second limiting portion.

[0008] In some embodiments of the utility model, the tensioning bracket includes a mounting base plate and two relatively arranged connecting side plates connected to the mounting base plate, and the swing rod is respectively connected to the two connecting side plates.

[0009] In some embodiments of the utility model, the first limiting portion is a first limiting protrusion provided on the connecting side plate, and the second limiting portion is a second limiting protrusion provided on the connecting side plate.

[0010] In some embodiments of the present utility model, the distance between the connection point of the elastic member on the swing rod and the center of gravity of the swing rod is less than 5 mm.

[0011] In some embodiments of the present utility model, the elastic member is a tension spring. One end of the tension spring is hooked on the lower side of the tension bracket, and the other end is hooked on the middle area of the swing rod.

[0012] In some embodiments of the present utility model, two tension springs are provided. One ends of the two tension springs are connected to the same position of the swing rod, and the other ends of the two tension springs are respectively connected to two spaced positions of the tension bracket.

[0013] In some embodiments of the present utility model, a first hooking portion and a second hooking portion are provided in the lower side area of the tension bracket, and a third hooking portion is provided on the swing rod. One of the tension springs is hooked between the first hooking portion and the third hooking portion, and the other tension spring is hooked between the second hooking portion and the third hooking portion.

[0014] In some embodiments of the present utility model, the swing rod is provided with a bending portion in the area between the pivot shaft and the support shaft, and the third hooking portion is located at a position close to the bending portion.

[0015] In some embodiments of the present utility model, the plate surface of the swing rod in the area between the bending portion and the pivot shaft is closely attached to the connection side plate, and the plate surface of the swing rod in the area between the bending portion and the support shaft has a gap with the connection side plate. The third hooking portion is connected to the area between the bending portion and the support shaft of the swing rod.

[0016] The technical solution of the present utility model has the following technical effects compared with the prior art:

[0017] In the tensioning device of the chain transmission mechanism provided by the present utility model, a swing rod for supporting the sprocket is pivotally connected to the tension bracket, and an elastic member is provided between the swing rod and the tension bracket to realize the swing adjustment of the sprocket, and further realize the automatic tensioning adjustment of the chain on the sprocket. The structure of the tensioning device is simple and reliable. The sprocket tensioning process does not require other power devices, the tensioning is reliable and the manufacturing cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following will describe in detail the preferred embodiments of the present utility model with the help of the drawings, which will help to understand the purpose and advantages of the present utility model, wherein:

[0019] Figure 1 is a perspective view of a specific embodiment of the tensioning device of the chain transmission mechanism of the present utility model;

[0020] Figure 2 This is the front view of a specific embodiment of the tensioning device of the chain drive mechanism of the present utility model. Specific embodiment

[0021] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Such as Figure 1 、 Figure 2The following shows the specific implementation of the tensioning device of the chain drive mechanism of the present utility model (hereinafter referred to as the tensioning device), which is used to achieve the tensioning of the chain in the chain transportation device to achieve reliable transmission. The tensioning device includes a tensioning bracket 10, a swing rod 20 pivotally connected to the tensioning bracket 10 through a pivot shaft 30, one end of the swing rod 20 away from the pivot shaft 30 is connected to a sprocket 50 through a support shaft 40; and an elastic member 60 connected between the tensioning bracket 10 and the swing rod 20, which is adapted to provide a force to the swing rod 20 around the pivot shaft 30; wherein, the distance from the connection point of the elastic member 60 on the swing rod 20 to the pivot shaft 30 is less than the distance from the support shaft 40 to the pivot shaft 30.

[0026] The above tensioning device realizes the swing adjustment of the sprocket 50 by arranging a swing rod 20 connected to the sprocket 50 on the tensioning bracket 10 and arranging an elastic member 60 between the swing rod 20 and the tensioning bracket 10, and further realizes the automatic tensioning adjustment of the chain on the sprocket 50. The structure is simple and reliable, and no other power device is required, and the production and manufacturing cost is relatively low.

[0027] Specifically, in an optional implementation manner, in order to avoid the situation that in the event of an accident, the swing amplitude of the swing rod 20 around the pivot shaft 30 is too large, which may lead to safety hazards such as interference between the sprocket 50 and other components, a limiting portion for limiting the maximum swing position of the swing rod 20 is provided on the tensioning bracket 10. Among them, the limiting portion includes a first limiting portion 71 and a second limiting portion 72 for limiting the maximum upward or downward swing position of the swing rod 20, and the swing rod 20 is located between the first limiting portion 71 and the second limiting portion 72.

[0028] Specifically, in an optional implementation manner, the tensioning bracket 10 includes a mounting bottom plate 11 and two relatively arranged connecting side plates 12 connected to the mounting bottom plate 11. A connecting hole is provided on the mounting bottom plate 11, which is used to mount the tensioning device on the lower side of the frame of the chain transportation device. The connecting side plates 12 are perpendicular to the mounting bottom plate 11 and are located on its lower side, and the swing rod 20 is respectively connected to the two connecting side plates 12. The support shaft 40 of the sprocket 50 supported by the two swing rods 20 can have better swing stability.

[0029] Specifically, in an optional implementation manner, the first limiting portion 71 is a first limiting protrusion provided on the connecting side plate 12, and the second limiting portion 72 is a second limiting protrusion provided on the connecting side plate 12. The first limiting protrusion and the second limiting protrusion are integrally formed or welded to the outer side surface of the connecting side plate 12. The swing rod 20 is in surface contact with the first limiting protrusion and the second limiting protrusion.

[0030] Specifically, in an alternative embodiment, the distance between the connection point of the elastic member 60 on the swing rod 20 and the center of gravity of the swing rod 20 is less than 5 mm, that is, the connection point of the elastic member 60 on the swing rod 20 is very close to the center of gravity of the swing rod 20, so that the elastic member 60 can stably and reliably drive the swing rod 20 to swing around the pivot shaft 30, and avoid the swing rod 20 from shaking during the swinging process.

[0031] Specifically, the elastic member 60 is a tension spring. One end of the tension spring is hooked to the lower side of the tension bracket 10, and the other end is hooked to the middle area of the swing rod 20. When the chain is installed on the sprocket 50, the swing rod 20 is manually driven to swing upward to make the tension spring in a stretched state, and the chain is installed on the sprocket 50. After the installation is in place, the elastic force of the tension spring can make the swing rod 20 swing downward until the chain is completely in a tensioned state.

[0032] Specifically, in an embodiment, in order to obtain a greater tension force in different situations, two tension springs are provided. One end of the two tension springs is connected to the same position of the swing rod 20, and the other ends of the two tension springs are respectively connected to two spaced positions of the tension bracket 10. The resultant force direction of the two tension springs is generally vertically downward, so that the swing rod 20 is always subjected to a downward elastic force, and the chain on the sprocket 50 is in a reliable tensioned state. In different situations, different tension forces can be obtained by replacing the tension springs with different elastic coefficients.

[0033] Specifically, in an alternative embodiment, a first hooking portion 13 and a second hooking portion 14 are provided in the lower side area of the tension bracket 10, and a third hooking portion 21 is provided on the swing rod 20. The first hooking portion 13, the second hooking portion 14 and the third hooking portion 21 form an isosceles triangle or an equilateral triangle. One of the tension springs is hooked between the first hooking portion 13 and the third hooking portion 21, and the other tension spring is hooked between the second hooking portion 14 and the third hooking portion 21.

[0034] Specifically, the swing rod 20 is provided with a bending portion 22 in the region between the pivot shaft 30 and the support shaft 40, and the third hooking portion 21 is located close to the bending portion 22. More specifically, the bending portion 22 forms a stepped surface on the swing rod 20. Among them, the plate surface of the swing rod 20 in the region between the bending portion 22 and the pivot shaft 30 is closely attached to the connecting side plate 12, and the plate surface of the swing rod 20 in the region between the bending portion 22 and the support shaft 40 has a gap with the connecting side plate 12. The third hooking portion 21 is connected to the region between the bending portion 22 and the support shaft 40 of the swing rod 20, and is spaced from the connecting side plate 12. During its tensioning process, it will not interfere with the connecting side plate 12 and thus affect the tensioning effect.

[0035] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A tensioning device for a chain transmission mechanism, characterized in that: include: A tensioning bracket (10); A swing rod (20) is pivotally connected to the tensioning bracket (10) via a pivot shaft (30), and one end of the swing rod (20) away from the pivot shaft (30) is connected to a sprocket (50) via a support shaft (40); An elastic member (60) is connected between the tensioning bracket (10) and the swing rod (20), and is suitable for providing a force around the pivot axis (30) to the swing rod (20); wherein the distance from the connection point of the elastic member (60) on the swing rod (20) to the pivot axis (30) is smaller than the distance from the support shaft (40) to the pivot axis (30).

2. A tensioning device for a chain transmission mechanism according to claim 1, characterized in that: The tensioning bracket (10) is provided with a limiting portion for limiting the maximum swing position of the swing rod (20), the limiting portion comprising a first limiting portion (71) and a second limiting portion (72), and the swing rod (20) is located between the first limiting portion (71) and the second limiting portion (72).

3. A tensioning device for a chain transmission mechanism according to claim 2, characterized in that: The tensioning bracket (10) comprises a mounting base plate (11) and two oppositely arranged connecting side plates (12) connected to the mounting base plate (11), and the two connecting side plates (12) are respectively connected to the swing rods (20).

4. A tensioning device for a chain transmission mechanism according to claim 3, characterized in that: The first limiting portion (71) is a first limiting protrusion provided on the connecting side plate (12), and the second limiting portion (72) is a second limiting protrusion provided on the connecting side plate (12).

5. A tensioning device for a chain transmission mechanism according to claim 1, characterized in that: The distance between the connection point of the elastic member (60) on the swing lever (20) and the center of gravity of the swing lever (20) is less than 5 mm.

6. A tensioning device for a chain transmission mechanism according to claim 4, characterized in that: The elastic member (60) is a tension spring, one end of which is hooked on the lower side of the tensioning bracket (10), and the other end of which is hooked on the middle area of ​​the swing rod (20).

7. A tensioning device for a chain transmission mechanism according to claim 6, characterized in that: Two tension springs are provided, one end of each of the two tension springs is connected to the same position of the swing rod (20), and the other ends of the two tension springs are respectively connected to two positions of the tension bracket (10) arranged at intervals.

8. A tensioning device for a chain transmission mechanism according to claim 7, characterized in that: A first hook portion (13) and a second hook portion (14) are arranged in the lower area of ​​the tension bracket (10), and a third hook portion (21) is arranged on the swing lever (20), wherein one of the tension springs is hooked between the first hook portion (13) and the third hook portion (21), and the other tension spring is hooked between the second hook portion (14) and the third hook portion (21).

9. A tensioning device for a chain transmission mechanism according to claim 8, characterized in that: The swing lever (20) is provided with a bent portion (22) in a region between the pivot shaft (30) and the support shaft (40), and the third hook portion (21) is located close to the bent portion (22).

10. A tensioning device for a chain transmission mechanism according to claim 9, characterized in that: The plate surface of the swing lever (20) in the area between the bent portion (22) and the pivot shaft (30) is tightly attached to the connecting side plate (12), and the plate surface of the swing lever (20) in the area between the bent portion (22) and the support shaft (40) has a gap with the connecting side plate (12), and the third hooking portion (21) is connected to the area between the bent portion (22) and the support shaft (40) of the swing lever (20).

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