Tension pulley and its processing technology

Abstract

The present invention belongs to the technical field of walking machinery, and particularly relates to a tension wheel and its processing technology. A sleeve-shaped hub is connected to the middle of an annular spoke plate, and a rim is detachably connected to the outer edge of the spoke plate. The innovation point of this patent is to split the original cast or forged integral part into three parts according to different usage functions of the product. The materials of the three parts are different from each other and are all superior to the original cast or forged materials. Moreover, the processing technology of the three split parts is more environmentally friendly and efficient, and the material combinations are diverse, which not only reduces the use cost of the tension wheel, but also greatly improves the convenience of use and maintenance of the tension wheel.

Description

Technical Field

[0001] The present invention belongs to the technical field of walking machinery, and particularly relates to a tensioning wheel and its processing technology. Background Art

[0002] The crawler-type walking mechanism drives the machine to walk by relying on the frictional force generated by the relative movement between the grounded crawler and the bottom plate. After walking a certain distance, the crawler tensioning device will become somewhat loose, and it is necessary to adjust the tension of the crawler by adjusting the tensioning wheel. When the tension force is large, it can not only prevent the crawler from falling off but also play a guiding role. Since the application environment of the crawler walking mechanism is usually relatively harsh, often operating in muddy water, and the crawler needs to bear a large resistance, the tensioning wheel is extremely prone to wear and needs to be replaced frequently.

[0003] The tensioning wheels in the prior art are usually manufactured by processes such as machining and heat treatment from casting blanks and are of an integral structure. The casting material with high hardness has poor toughness, and it is easy for the tensioning wheel to break when hitting sharp objects during walking; the casting material with slightly lower hardness and excellent toughness has poor wear resistance and a short service life of the wheel body. When replacing the integral-structure tensioning wheel, it is necessary to stop the machine and disassemble and replace it as a whole, resulting in high usage and maintenance costs of the crawler walking mechanism. Summary of the Invention

[0004] The purpose of the present invention is to provide a tensioning wheel and its processing technology that are convenient to replace and have low application costs.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A tensioning wheel, wherein a tubular hub is connected to the middle of an annular spoke plate, and a rim is detachably connected to the outer edge of the spoke plate.

[0007] A processing technology for a tensioning wheel, comprising the following steps:

[0008] A. Process the hub, spoke plate, and rim unit segments separately;

[0009] B. Weld the hub and the spoke plate together;

[0010] C. Connect the rim unit segments end to end at the outer edge of the spoke plate.

[0011] Compared with the prior art, the present invention has the following technical effects: After the tension pulley wears, it is not necessary to disassemble the entire wheel body. Only the rim needs to be replaced separately. The service life of the wheel body is long, and the replacement of the rim is convenient. It can reduce the use cost of the tension pulley while greatly improving the convenience of use and maintenance of the tension pulley. Since the spoke and the rim are of a detachable structure, the two can be made of two different materials, without being restricted by the material fusion processing technology. The product processing is more environmentally friendly and efficient, and the material combination is diversified. The original cast or forged one-piece can be split into three parts: the hub, the spoke, and the rim for separate processing, and the production is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0013] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0014] Figure 2 is a three-dimensional schematic diagram of the present invention with one rim unit segment removed;

[0015] Figure 3 is a three-dimensional schematic diagram of the rim unit segment;

[0016] Figure 4 is a sectional schematic diagram of the present invention;

[0017] Figure 5 is a schematic diagram of the split state of the spoke plate and the rim of the present invention;

[0018] Figure 6 is a schematic diagram of the blank plate;

[0019] Figure 7 is a schematic diagram when the blank plate is placed between the upper and lower molds in the closed mold state;

[0020] Figure 8 is a schematic diagram when the blank plate is being spin-formed;

[0021] Figure 9 is a schematic diagram of the spoke;

[0022] Figure 10 is a schematic diagram when the hub and the spoke are connected.

[0023] In the figures: 1. blank plate, 10. hub, 20. spoke plate, 21. spoke, 22. outer edge convex part, 30. rim, 31. rim unit segment, 311. concave groove, 312. concave part, 313. convex part, 40. connecting bolt, 1. blank plate, 41. lower mold, 411. limiting part, 42. upper mold, 43. spinning wheel, 431. annular groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will further elaborate on the specific implementation of the present invention in detail by describing the embodiments in conjunction with the accompanying drawings.

[0025] A tension pulley, a sleeve-shaped hub 10 is connected to the middle of an annular spoke 20, and a rim 30 is detachably connected to the outer edge of the spoke 20. When in use, after the tension pulley is worn, there is no need to disassemble the entire wheel body. Only the rim 30 needs to be replaced separately. The service life of the wheel body is long, and the replacement of the rim 30 is convenient. It can reduce the use cost of the tension pulley while greatly improving the convenience of use and maintenance of the tension pulley.

[0026] According to the different functions of the components, the original cast or forged integral part can be split into three parts: the hub 10, the spoke 20, and the rim 30 for separate processing, making production more efficient. The materials of the three parts can be different, and materials superior to the original cast or forged materials can be selected separately according to requirements. The material combination is diverse and not restricted by the material fusion processing technology. While ensuring the use function, production is more environmentally friendly.

[0027] In this embodiment, the hub 10 and the spoke 20 are made of metal materials and are welded together. To improve the product performance, the rim 30 is made of a material with better wear resistance than the spoke 20. In this embodiment, the spoke 20 is made of medium carbon steel, and the rim 30 is made of alloy steel or engineering plastic. In this way, on the premise that the connection structure between the two ensures their synchronous rotation and cooperation, the toughness and hardness of the hub 10 and the spoke 20 and the wear resistance of the rim 30 can be improved at low cost and high efficiency, thereby greatly extending the service life of the tension pulley.

[0028] The cross-section at the outer edge of the spoke 20 is T-shaped or mushroom-shaped. As shown in the attached Figure 4 figure, the spoke 20 includes a web 21 in the middle and an outer convex portion 22 at the outer edge of the web 21. The cavity shape of the concave groove 311 matches the shape of the outer edge of the spoke 20. In this way, the connection area between the two is large, and the static friction is large when the rim 30 is fastened to the outer convex portion 22 of the spoke 20, thereby ensuring their synchronous rotation and cooperation.

[0029] The rim 30 is composed of at least two circular arc-shaped rim unit segments 31 arranged circumferentially in sequence and the head and tail of adjacent segments are connected end to end. The inner side of the rim unit segment 31 is a concave groove 311 with the notch pointing to the wheel core. The concave groove 311 is clamped on the outer edge of the spoke 20, and the longest one among the rim unit segments 31 is semi-circular arc-shaped. In this way, it is not only convenient for the installation and disassembly of the rim 30, but also the rim 30 can closely cover the outer edge of the spoke 20 to prevent the spoke 20 from being worn.

[0030] In this embodiment, as shown in the attached Figures 1-5As shown in the figure, the rim 30 is formed by connecting two semi-circular rim unit segments 31 end to end. A convex portion 312 at the end of the rim unit segment 31 is inserted into a concave portion 313 at the end of an adjacent rim unit segment 31 to form a plug-in fit. A connecting bolt 40 passing through both of them is provided at the mating portion of the convex portion 312 and the concave portion 313, and the length direction of the connecting bolt 40 is parallel to the direction of the wheel core.

[0031] The concave portion 313 is arranged through the bottom of the concave groove 311 and the notch points to the circumferential direction or can also be understood as the tangential direction. The groove width direction of the concave portion 313 is consistent with the direction of the wheel core. The convex portion 312 is arranged at the bottom of the concave groove 311 and the protruding direction is opposite to the notch direction of the concave portion 313.

[0032] In this embodiment, a convex portion 312 is provided at one end of the rim unit segment 31, and a concave portion 313 is provided at the other end. Each rim unit segment 31 forming the rim 30 can be processed by cutting a same ring-shaped member.

[0033] The following processing technology can be adopted for the tension wheel:

[0034] A. Process the hub 10, the spoke 20 and the rim unit segment 31 respectively;

[0035] B. Weld and connect the hub 10 and the spoke 20;

[0036] C. Connect the rim unit segments 31 end to end at the outer edge of the spoke 20.

[0037] The following steps can be adopted for processing the spoke 20 in step A:

[0038] A1. Provide a raw material plate, and cut to obtain a circular ring-shaped blank 1;

[0039] A2. Place the blank 1 on the lower die 41, and the inner edge of the blank 1 is in limit fit with the limit portion 411 protruding from the middle of the lower die 41;

[0040] A3. The upper die 42 and the lower die 41 are closed, and the outer section plate body of the blank 1 extends out of the upper die 42 and the lower die 41;

[0041] A4. The upper die 42 and the lower die 41 drive the blank 1 to rotate around its axis direction, the spinning wheel 43 rotates and displaces along the plate surface direction of the blank 1 to spin the extended plate body of the blank 1 into an annular strip, forming a mushroom-shaped outer edge convex portion 22;

[0042] A5. Separate the mold and remove the spun part to obtain the required spoke 20.

[0043] Among them, as shown in the appendix Figure 7 、 8As shown, the outer peripheral surfaces of the upper die 42 and the lower die 41 are cylindrical surfaces and are circles with diameters smaller than the outer diameter of the blank 1. A ring groove 431 is formed in the circumferential direction of the spinning wheel 43. The groove opening of the groove cavity of the ring groove 431 is large and the groove bottom is narrow, which is consistent with the outer surface of the outer edge convex part 22. As attached Figure 8 As shown, during spinning, the blank 1 body that extends outside the upper die 42 and the lower die 43 is spun into the outer edge convex part 22 within the area enclosed by the outer peripheral cylindrical surfaces of the upper and lower dies 42 and 43 and the ring groove 431 of the spinning wheel 43.

Claims

1. A tension pulley, wherein a hub (10) in the shape of a sleeve is connected to the middle of a spoke (20) in the shape of an annular plate, and is characterized in that: A detachable rim (30) is connected to the outer edge of the spoke (20). The rim (30) is formed by arranging at least two arc-shaped rim unit segments (31) in a circumferential continuation manner, with the head and tail of adjacent segments connected end to end. The inner side of the rim unit segment (31) is a concave groove (311) with the notch pointing towards the wheel core. The concave groove (311) is clamped at the outer edge of the spoke (20). The longest one among the rim unit segments (31) in terms of perimeter is semi-circular arc-shaped. A convex portion (312) at the end of the rim unit segment (31) is inserted into a concave portion (313) at the end of an adjacent rim unit segment (31) to form a plug-in fit. A connecting bolt (40) passing through both is provided at the mating portion of the convex portion (312) and the concave portion (313). The length direction of the connecting bolt (40) is parallel to the direction of the wheel core. The processing technology of the tension pulley includes the following steps: A. Process the hub (10), the spoke (20), and the rim unit segment (31) respectively; B. Weld and connect the hub (10) and the spoke (20); C. Connect the rim unit segments (31) end to end at the outer edge of the spoke (20).

2. The tension pulley according to claim 1, wherein: The rim (30) is formed by connecting two semi-circular arc-shaped rim unit segments (31) end to end.

3. The tension pulley according to claim 1, characterized in that: The cross-section at the outer edge of the spoke (20) is T-shaped or mushroom-shaped, and the cavity shape of the concave groove (311) matches the shape at the outer edge of the spoke (20).

4. The tension pulley according to claim 1, wherein: The concave portion (313) is arranged through the bottom of the concave groove (311) with the notch pointing in the circumferential direction. The width direction of the concave portion (313) is the same as the direction of the wheel core. The convex portion (312) is arranged at the bottom of the concave groove (311) with the protruding direction opposite to the notch direction of the concave portion (313).

5. The tension pulley according to claim 3 or 4, characterized in that: One end of the rim unit segment (31) is provided with a convex portion (312), and the other end is provided with a concave portion (313).

6. The tension pulley according to claim 1, wherein: The rim (30) is made of a material with better wear resistance than the spoke (20).

7. The tension pulley according to claim 6, wherein: The spoke (20) is made of medium carbon steel, and the rim (30) is made of alloy steel or engineering plastic.

8. The tension pulley according to claim 1, wherein: The processing steps of the spoke (20) in step A are as follows: A1. Provide a raw material plate, and cut to obtain a circular ring plate blank (1); A2. Place the blank (1) on the lower die (41), and the inner edge of the blank (1) is in limit fit with the limit portion (411) protruding from the middle of the lower die (41); A3. The upper die (42) and the lower die (41) are closed, and the outer section plate body of the blank (1) extends out of the outside of the upper die (42) and the lower die (41); A4. The upper die (42) and the lower die (41) drive the blank (1) to rotate around its axis direction, the spinning wheel (43) rotates and displaces along the plate surface direction of the blank (1) to spin the extended plate body of the blank (1) into an annular strip; A5. Separate the mold and remove the spun part to obtain the required spoke (20).

9. The tension pulley according to claim 8, wherein: The outer peripheral surfaces of the upper die (42) and the lower die (41) are cylindrical surfaces and are circles with a diameter smaller than the outer diameter of the blank (1). An annular groove (431) is provided in the circumferential direction of the spinning wheel (43), and the notch of the cavity of the annular groove (431) is large and the bottom is narrow.

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