Swing mechanism

Abstract

The utility model provides a slewing mechanism, which relates to the field of grass trimmer machinery and comprises a shell, a chain wheel mechanism and a telescopic cylinder, the chain wheel mechanism and the telescopic cylinder are arranged in the shell, the chain wheel mechanism comprises a first chain wheel, a second chain wheel and a chain which is in transmission between the first chain wheel and the second chain wheel, the first chain wheel and the second chain wheel are rotationally connected with the shell, and the chain is of a disconnected chain structure. The base is provided with two free ends, and a space for placing the telescopic cylinder is reserved between the two free ends; the telescopic cylinder is arranged between the two free ends, the axis direction of the telescopic cylinder is the same as the length direction of the chain, the telescopic cylinder is of a two-way telescopic cylinder structure, and the two telescopic ends of the telescopic cylinder are connected with the two free ends of the chain respectively. A connecting flange is arranged on the outer side of the shell and fixedly connected with the second chain wheel. According to the position layout and the connection relation, the telescoping of the telescoping cylinder is completely the same as the transmission direction of the chain, the chain is prevented from being deflected and pulled, and the transmission stability of the chain is guaranteed; the overall structural design is more reasonable, and miniaturization design of the overall structure is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of grass cutting machinery, and particularly relates to a slewing mechanism. Background Art

[0002] Hedge trimmers are mainly used for trimming hedges on both sides of roads. In order to meet the multi-angle trimming requirements of the working head, a slewing mechanism is often arranged between the working head and the connecting arm. For example, in the prior art, the utility model patent with the publication number of CN205,830,477U discloses a 360° slewing device for a multi-functional trimming robot, which includes a hydraulic cylinder and a sprocket mechanism. The sprocket mechanism includes a chain and two sprockets. The chain can rotate around the two sprockets. A connecting plate is arranged on one side of the chain, and the connecting plate is connected to the hydraulic cylinder. During use, the hydraulic cylinder is used to push the chain to move, and the chain drives the sprockets to rotate, so as to realize the rotation of the output shaft.

[0003] However, due to the relative positional relationship between the hydraulic cylinder and the chain in the above prior art, the telescopic end of the hydraulic cylinder is connected to the connecting plate on one side of the chain. Therefore, it is easy to cause the problem that the chain runs unstably due to the pulling of the chain by the hydraulic cylinder during the process of controlling the rotation of the chain. Moreover, the relative positional relationship between the hydraulic cylinder and the chain will also result in a relatively large volume of the overall structure, and this structure is particularly disadvantageous for application in equipment with a large number of component arrangements. Summary of the Utility Model

[0004] The utility model provides a slewing mechanism with more stable operation and smaller volume for the above problems existing in the prior art.

[0005] The technical solution for the utility model to solve the above technical problems is as follows: a slewing mechanism, including a housing and a sprocket mechanism and a telescopic cylinder arranged in the housing. It is characterized in that the sprocket mechanism includes a first sprocket, a second sprocket and a chain driving between the two. The first sprocket and the second sprocket are both rotatably connected to the housing. The chain is a discontinuous chain structure, which has two free ends, and a space for placing the telescopic cylinder is reserved between the two free ends.

[0006] The telescopic cylinder is arranged between the two free ends, and the axial direction of the telescopic cylinder is the same as the length direction of the chain. The telescopic cylinder is a double-acting telescopic cylinder structure. The cylinder barrel of the telescopic cylinder is fixed to the housing. One telescopic end of the telescopic cylinder is connected to one free end of the chain, and the other telescopic end of the telescopic cylinder is connected to the other free end of the chain.

[0007] A connecting flange is arranged on the outer side of the housing, and the connecting flange is fixedly connected to the second sprocket.

[0008] Further, the first sprocket is set as an adjustable sprocket.

[0009] Furthermore, the first sprocket is connected to the housing through a support shaft. The first sprocket is rotatably connected to the support shaft, and the support shaft is fixed to an adjusting plate provided outside the housing. A sliding hole for the support shaft to slide is provided on the housing. A tensioning seat is arranged beside the adjusting plate, and a tensioning bolt is connected between the adjusting plate and the tensioning seat.

[0010] Further, a window is provided on the housing for the pipeline port of the telescopic cylinder to extend out.

[0011] Further, both free ends of the chain are located on the same side of the chain.

[0012] Further, the telescopic end of the telescopic cylinder is connected to the free end of the chain through a chain connecting block.

[0013] Furthermore, the chain connecting block is of a cuboid structure.

[0014] The beneficial effects of the present utility model are as follows: By providing a telescopic cylinder and a sprocket mechanism built into the housing, especially the chain in the sprocket mechanism adopts a discontinuous chain structure, and the bidirectional telescopic cylinder is placed at its disconnection point and its two telescopic ends are respectively connected to the two free ends of the chain. This position layout and connection relationship enable the telescopic movement of the telescopic cylinder to be completely in the same direction as the transmission direction of the chain, avoiding the deviation and pulling of the chain, and ensuring the stability of the chain transmission; the overall structure design is more reasonable, which can solve the problem of excessive volume caused by arranging the telescopic cylinder beside the chain, and is conducive to the miniaturization design of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of a slewing mechanism according to an embodiment of the present utility model;

[0016] Figure 2 is a front view structural schematic diagram of a slewing mechanism according to an embodiment of the present utility model;

[0017] Figure 3 is Figure 2 the cross-sectional structural schematic diagram taken along the E-E direction in

[0018] Figure 4 is a connection structural schematic diagram of a sprocket mechanism and a telescopic cylinder according to an embodiment of the present utility model;

[0019] In the figure: 1. Housing, 11. Sliding hole, 2. Telescopic cylinder, 21. Chain connecting block, 31. First sprocket, 32. Second sprocket, 33. Chain, 330. Free end, 4. Connecting flange, 5. Window, 6. Support shaft, 7. Adjusting plate, 8. Tensioning seat, 9. Tensioning bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The principles and features of the present utility model will be described below. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0021] As shown in the attached drawings, the slewing mechanism of this embodiment includes a housing 1, a sprocket mechanism 3 and a telescopic cylinder 2 arranged in the housing 1. The sprocket mechanism includes a first sprocket 31, a second sprocket 32 and a chain 33 driving between the two. Both the first sprocket 31 and the second sprocket 32 are rotatably connected to the housing 1. The chain 33 is a discontinuous chain 33 structure, which has two free ends 330, and a space for placing the telescopic cylinder 2 is reserved between the two free ends 330. The two free ends 330 of the chain 33 are both located on the same side of the chain 33;

[0022] The telescopic cylinder 2 of this embodiment adopts a hydraulic cylinder, which is arranged between the two free ends 330 and the axial direction of the telescopic cylinder 2 is the same as the length direction of the chain 33. The telescopic cylinder 2 is a double-acting telescopic cylinder structure. The cylinder barrel of the telescopic cylinder 2 is fixed to the housing 1. One telescopic end of the telescopic cylinder 2 is fixedly connected to one free end 330 of the chain 33 through a chain connection block 21, and the other telescopic end of the telescopic cylinder 2 is fixedly connected to the other free end 330 of the chain 33 through a chain connection block 21; The chain connection block 21 is preferably a cuboid structure, which is convenient for fixing one end to the free end 330 and the other end to the telescopic end of the telescopic cylinder 2. In addition, by setting the outer surface of the chain connection block 21 to be adapted to the inner wall of the housing 1, the chain connection block 21 can be used as a guide block when sliding with the telescopic cylinder 2, which is more conducive to the stability of the telescopic cylinder 2 driving the chain 33 to run.

[0023] A connecting flange 4 is arranged on the outside of the housing 1. The connecting flange 4 is rotatably installed on the housing 1 through a bearing, and the connecting flange 4 is fixedly connected to the second sprocket 32 coaxially.

[0024] In the working state of this embodiment, the two telescopic ends of the telescopic cylinder 2 extend and retract reciprocally, driving the chain 33 to drive, and then driving the two sprockets to rotate. Then the connecting flange 4 fixedly connected to the second sprocket 32 can rotate, that is, the slewing of the working head connected to the connecting flange 4 can be realized. In this solution, the telescopic cylinder 2 is connected between the two free ends 330 of the chain 33. When the telescopic cylinder 2 drives the chain 33 to drive through the extension and retraction of the two telescopic ends, the stability of the chain drive can be ensured; the overall structure design is more reasonable, and the problem of excessive volume caused by setting the telescopic cylinder beside the chain can be solved, which is beneficial to the miniaturization design of the overall structure.

[0025] In a preferred embodiment of the present utility model, the first sprocket 31 is set as an adjustable sprocket. Specifically: see Figure 3As shown in the figure, the first sprocket 31 is connected to the housing 1 through the support shaft 6. The first sprocket 31 is rotatably connected to the support shaft 6. The support shaft 6 is fixed to the adjusting plate 7 provided outside the housing 1. The housing 1 is provided with a sliding hole 11 for the support shaft 6 to linearly slide along the radial direction of the housing 1. A tensioning seat 8 is arranged beside the adjusting plate 7, and a tensioning bolt 9 is connected between the adjusting plate 7 and the tensioning seat 8. The position of the first sprocket 31 in the housing 1 is adjusted by the sliding of the support shaft 6 in the sliding hole 11, thereby adjusting the tension of the chain 33. Then, the adjusting plate 7 and the tensioning seat 8 are fixed by using the tensioning bolt 9.

[0026] In a preferred embodiment of the present invention, the housing 1 is provided with a window 5 for partially embedding the telescopic cylinder 2. The cylinder part of the telescopic cylinder is embedded in the window 5 or protrudes outside the housing 1, which can further reduce the volume of the housing 1 and is more conducive to the miniaturized design of the overall structure.

Claims

1. A slewing mechanism, comprising a housing (1) and a sprocket mechanism and a telescopic cylinder (2) arranged inside the housing (1), characterized in that, The sprocket mechanism includes a first sprocket (31), a second sprocket (32), and a chain (33) that drives between the two. The first sprocket (31) and the second sprocket (32) are both rotatably connected to the housing (1). The chain (33) is a split-chain structure, which has two free ends (330), and a space for placing the telescopic cylinder (2) is reserved between the two free ends (330). The telescopic cylinder (2) is arranged between the two free ends (330), and the axial direction of the telescopic cylinder (2) is the same as the length direction of the chain (33). The telescopic cylinder (2) is a double-acting telescopic cylinder structure. The cylinder barrel of the telescopic cylinder (2) is fixed to the housing (1). One telescopic end of the telescopic cylinder (2) is connected to one free end (330) of the chain (33), and the other telescopic end of the telescopic cylinder (2) is connected to the other free end (330) of the chain (33). A connecting flange (4) is arranged on the outer side of the housing (1), and the connecting flange (4) is fixedly connected to the second sprocket (32).

2. The slewing mechanism according to claim 1, characterized in that, The first sprocket (31) is set as an adjustable sprocket.

3. The slewing mechanism according to claim 2, characterized in that The first sprocket (31) is connected to the housing (1) through a support shaft (6). The first sprocket (31) is rotatably connected to the support shaft (6). The support shaft (6) is fixed to an adjusting plate (7) arranged outside the housing (1). A sliding hole (11) for the support shaft (6) to slide is provided on the housing (1). A tensioning seat (8) is arranged beside the adjusting plate (7), and a tensioning bolt (9) is connected between the adjusting plate (7) and the tensioning seat (8).

4. The slewing mechanism according to claim 1, wherein A window (5) for partially embedding the telescopic cylinder (2) is provided on the housing (1).

5. The slewing mechanism according to claim 1, characterized in that Both free ends (330) of the chain (33) are located on the same side of the chain (33).

6. The slewing mechanism according to claim 1, characterized in that, The telescopic end of the telescopic cylinder (2) is connected to the free end (330) of the chain (33) through a chain connecting block (21).

7. The slewing mechanism according to claim 6, wherein The chain connecting block (21) is a cuboid structure.

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