Anti-drop transmission chain

Abstract

The utility model relates to a kind of anti-drop transmission chain, including outer link and inner link, the outer link is composed of two outer chain plates and pin shaft, the both ends of the pin shaft are pressed into the pin hole of the outer chain plate, and the shaft section surface of the pin shaft and the outer chain plate cooperation is provided with knurl structure;The knurl structure and the inner wall of the pin hole of the outer chain plate form mechanical occlusion, so that the pin shaft and the outer chain plate between constitute interference fit connection.The utility model can greatly enhance the connection stability and anti-loosening ability between pin shaft and chain plate under the premise of not changing the basic structure of chain, not making pin shaft end protruding, thereby prolonging the service life of chain, improving equipment operation reliability.

Description

Technical fields:

[0001] This utility model belongs to the field of chain technology, specifically relating to an anti-detachment transmission chain. Background technology:

[0002] Chains, as a basic transmission component, are widely used in various mechanical equipment. In certain specialized industries, such as food processing and pharmaceuticals, where there are extremely high requirements for the compactness, safety, operational precision, and speed of equipment, it is sometimes necessary for the end of the chain pin to not protrude beyond the outer side of the chain plate (i.e., "pin not exposed"), in order to avoid interference, accumulation of dirt, or potential safety hazards.

[0003] This requirement renders traditional axial fixing methods, such as riveting or adding locking pins to prevent the pin from loosening from the chain plate hole, unusable. Current technology relies solely on the initial press-fit interference between the pin and the outer chain plate hole to maintain the connection. However, under high-speed, high-load, and vibrating conditions, simple press-fit is unreliable. The interference between the pin and the chain plate hole gradually decreases due to slight material deformation and wear, eventually leading to a loose connection. Minor rotation and axial movement of the pin exacerbate wear on the chain plate hole, creating a vicious cycle that not only affects transmission accuracy but can also cause the chain to fall off, resulting in serious production interruptions and safety accidents. Therefore, users need to frequently inspect and replace these chains, leading to high maintenance costs and inherent risks.

[0004] How to design an anti-detachment transmission chain is a technical problem that urgently needs to be solved in this field. Utility Model Content:

[0005] The technical problem to be solved by this utility model is to provide an anti-detachment transmission chain. This anti-detachment transmission chain can greatly enhance the connection stability and anti-loosening ability between the pin and the chain plate without changing the basic structure of the chain or making the pin end protrude, thereby extending the service life of the chain and improving the reliability of equipment operation.

[0006] The technical solution of this utility model is to provide an anti-detachment transmission chain, including an outer link and an inner link. The outer link consists of two outer link plates and a pin. Both ends of the pin are pressed into the pin holes of the outer link plates, and the surface of the shaft section that mates with the outer link plates is provided with a knurled structure. The knurled structure forms a mechanical engagement with the inner wall of the pin hole of the outer link plate, so that the pin and the outer link plates form an interference fit connection.

[0007] Preferably, the two end faces of the pin do not extend beyond the outer end face of the pin hole of the outer chain plate.

[0008] Preferably, the knurling structure is a mesh knurling or a spiral protrusion, which forms uniform micro-protrusions on the pin surface through plastic deformation.

[0009] Preferably, the knurled structure has a coverage length along the pin axis that is not less than the thickness of the outer chain plate, ensuring that the entire mating area can provide effective locking force.

[0010] Preferably, the inner wall of the pin hole of the outer chain plate has a groove that matches the knurled structure. This groove is formed by a machining center, and the two fit together to further enhance the mechanical interlocking effect.

[0011] Preferably, the inner link includes two inner link plates, a sleeve, and a roller. The sleeve is pressed into the hole of the inner link plate, the roller is sleeved on the outside of the sleeve, and the pin passes through the sleeve.

[0012] Preferably, the outer diameter of the shaft segment that mates with the outer chain plate is 0.05-0.1 mm larger than the outer diameter of the middle shaft segment of the pin, and the height of the knurled protrusion is 0.3-0.5 mm.

[0013] Furthermore, the pin is at least 5 units (HRC) harder than the outer chain plate. This results in a better meshing fit between the two.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] Extremely high connection stability: The knurled structure generates friction and mechanical engagement force between the pin and the chain plate hole wall that far exceeds that of ordinary press fit, which can effectively resist the rotation and axial movement of the pin and fundamentally solve the problem of loosening when the pin does not protrude.

[0016] Significantly improves fatigue resistance: The robust connection reduces fretting wear, greatly reducing the risk of chain plate holes being worn larger and chain pitch elongation failure due to loose connection, thereby significantly extending the service life of the chain under harsh working conditions.

[0017] Maintaining a compact structure: The reinforcement is achieved entirely within the original chain structure without adding any external parts or changing the external dimensions, perfectly meeting the application scenarios with stringent requirements for space and safety.

[0018] The process is simple and the cost is low: it only requires adding a knurling process to the existing pin processing flow, without the need for complicated equipment or expensive materials, and can improve performance, making it extremely economical.

[0019] High reliability: Once the mechanical interlocking connection is established, its performance degrades very slowly, ensuring that the chain can operate stably for a long time and reducing maintenance frequency and cost. Attached image description:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the pin structure.

[0022] In the diagram: 1. Inner link plate; 2. Outer link plate; 3. Roller; 4. Pin; 5. Sleeve; 6. Knurled structure. Detailed implementation method:

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1 , 2 As shown, an anti-detachment transmission chain is composed of alternating hinged outer and inner links. The outer links mainly consist of two outer chain plates 2 and two pins 4. The inner links mainly consist of two inner chain plates 1, sleeves 5 pressed into holes in the inner chain plates, and rollers 3 fitted around the sleeves 5. During assembly, the pins 4 pass sequentially through one outer chain plate 2, the sleeve 5, and the other outer chain plate 2, thereby connecting the inner and outer links.

[0025] The core innovation of this utility model lies in the connection method between the pin 4 and the outer chain plate 2. Before assembly, the shaft sections at both ends of the pin 4 that need to be pressed into the pin holes of the outer chain plate 2 are knurled to form a raised knurled structure 6. This knurled structure 6 can be a mesh pattern, a spiral protrusion, etc.; in this embodiment, it is a square mesh pattern. When the pin 4 is pressed into the pin hole of the outer chain plate 2 using a bearing press, the raised knurled structure 6 on the surface of the pin 4 will press against the hole wall of the outer chain plate 2, forming a mechanical engagement. Because the knurling process increases the contact area of ​​the mating shaft section of the pin 4, the connection between the pin 4 and the outer chain plate 2 is tighter. At this time, the friction and engagement force between the surface of the pin 4 and the inner wall of the hole of the outer chain plate 2 make the knurled structure 6 firmly embedded in the chain plate, forming a stable interlocking connection and a deep mechanical interlocking and engagement. This interlocking structure effectively prevents the relative movement of the pin 4 within the outer chain plate 2, reduces the risk of loosening and falling off the pin 4, and enhances the running stability and durability of the chain.

[0026] As one implementation, the knurled structure 6 has a coverage length along the pin shaft 4 that is not less than the thickness of the outer chain plate 2, ensuring that the entire mating area can provide effective locking force.

[0027] In one implementation, the inner wall of the pin hole of the outer link plate 2 has a groove adapted to the knurled structure 6. This groove is machined by a machining center, and the two fit together. Its tensile strength and torsional resistance far exceed those of traditional interference fits, further enhancing the mechanical engagement effect. Furthermore, the pin 4 is precisely press-fitted to a position where its end face is flush with or slightly lower than the outer side of the outer link plate 2, achieving the requirement that the pin does not protrude.

[0028] In this embodiment, the outer diameter of the shaft segment that mates with the outer link plate 2 is 0.08 mm larger than the outer diameter of the middle shaft segment of the pin, and the height of the protruding part of the knurled structure 6 is 0.3 mm. Of course, it should be noted that the middle shaft segment of the pin must be smaller than the inner hole of the sleeve, and the knurled end must also be smaller than the inner hole of the sleeve, so that it can be assembled and the engagement can be achieved by utilizing the knurled shape and the shaft hardness.

[0029] Through the above structure, this utility model successfully solves the technical bottleneck that chain pins are prone to loosening in special situations due to the inability to fix the ends, and provides a knurled transmission chain with simple structure, reliable performance and easy manufacturing, achieving the anti-loosening effect.

Claims

1. A drive chain for preventing detachment, comprising an outer link and an inner link, wherein the outer link consists of two outer links and a pin, characterized in that: Both ends of the pin are pressed into the pin holes of the outer chain plate, and the surface of the shaft section that mates with the outer chain plate is provided with a knurled structure; the knurled structure and the inner wall of the pin hole of the outer chain plate form a mechanical engagement, so that the pin and the outer chain plate form an interference fit connection.

2. The anti-detachment transmission chain according to claim 1, characterized in that: The two end faces of the pin do not extend beyond the outer end face of the pin hole of the outer chain plate.

3. The anti-detachment transmission chain according to claim 1, characterized in that: The knurling structure is either a mesh knurling or a spiral protrusion.

4. The anti-detachment transmission chain according to claim 1, characterized in that: The knurled structure has a coverage length along the pin axis that is not less than the thickness of the outer chain plate.

5. The anti-detachment transmission chain according to claim 1, characterized in that: The inner wall of the pin hole of the outer chain plate has a groove adapted to the knurled structure.

6. The anti-detachment transmission chain according to claim 1, characterized in that: The inner link includes two inner link plates, a sleeve, and a roller. The sleeve is pressed into the hole of the inner link plate, the roller is sleeved on the outside of the sleeve, and the pin passes through the sleeve.

7. The anti-detachment transmission chain according to claim 1, characterized in that: The outer diameter of the shaft section that mates with the outer chain plate is 0.05-0.1 mm larger than the outer diameter of the middle shaft section of the pin, and the height of the knurled protrusion is 0.3-0.5 mm.

8. The anti-detachment transmission chain according to claim 1, characterized in that: The pin is at least 5 units harder than the outer chain plate.

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