Wear-resistant distributed roller carpet chain and manufacturing method thereof

Abstract

The present application relates to chain technology field, and discloses a wear-resistant distributed roller blanket chain and a manufacturing method thereof.The wear-resistant distributed roller blanket chain comprises multiple groups of series-connected chain link units, and each group contains at least three chain links.A single chain link is composed of a pin shaft, an inner roller, an outer roller, an inner chain piece, an outer gasket and an axial locking piece.The lengths of the inner and outer rollers in each chain link in the same unit are different, and the lengths of the rollers at the joint are matched.The total length of the inner roller and the two outer rollers is constant, and the center lines of the inner rollers are collinear.The inner chain piece is connected across the adjacent pin shafts, so that the friction positions are distributed in the axial direction.The present application solves the problems of the existing roller blanket chain, such as serious local wear of the pin shaft, poor running stability, uneven bearing surface and high operation and maintenance cost, realizes uniform wear of the pin shaft, improves the running stability and the flatness of the bearing surface, prolongs the service life of the chain and reduces the operation and maintenance cost, and is suitable for industrial material conveying.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, specifically to a wear-resistant, distributed roller blanket chain and its manufacturing method. Background Technology

[0002] Roller blanket chains are key transmission components used in industries such as building materials, chemicals, metallurgy, and mining for conveying lumpy and granular materials. Existing conventional roller blanket chains have a simple structure, with uniform roller lengths in each link and a fixed roller arrangement throughout the entire chain unit. Under long-term continuous operation, this has revealed several interrelated technical problems that urgently need to be addressed:

[0003] First, the pins suffer from severe localized wear, resulting in a short chain lifespan. In existing roller blanket chains, all chain links have rollers of uniform length, and the frictional contact position between the inner chain links and the pins is always fixed in the same axial region of the pins. During long-term cyclic operation, the frictional load is highly concentrated, which easily causes excessive localized wear on the pins, and may even lead to the pins becoming thinner or breaking, directly causing chain failure and a significant reduction in service life.

[0004] Secondly, the chain has poor stability and is prone to deviation and jamming. The uniform length of the rollers causes the force on various parts of the chain to be concentrated and unevenly distributed. During operation, the chain is prone to deviation, shaking, abnormal noise, and jamming, which disrupts the continuity of conveying and affects the normal operation of the production line.

[0005] Third, the unevenness of the bearing surface makes it easy for materials to shift and fall during transport. The rollers are arranged in a single pattern and have the same length. The joints between adjacent chain links are prone to height differences, and the overall bearing surface of the chain is uneven. When transporting blocky or granular materials, material shifting, falling, and jamming are likely to occur, reducing transport efficiency and even causing material waste.

[0006] Fourth, the overall wear is concentrated, maintenance frequency is high, and operation and maintenance costs are high. The frictional load is concentrated in a local area of ​​the pin shaft for a long time, which not only accelerates the wear of the pin shaft, but also aggravates the local wear of the inner chain links and rollers. The overall wear resistance of the chain is poor, requiring frequent inspection and replacement, resulting in a large workload and high operation and maintenance costs.

[0007] In summary, existing roller blanket chains suffer from four major problems due to their uniform roller length and fixed friction positions: severe local wear of the pin shaft, poor operational stability, uneven bearing surface, and poor overall wear resistance. The market urgently needs a new roller blanket chain structure that can simultaneously solve the above defects, has high reliability, and a long service life. Summary of the Invention

[0008] The purpose of this invention is to solve the technical problems of severe local wear of pins, poor operational stability, uneven bearing surface, and poor overall wear resistance caused by the uniform length of rollers and fixed friction positions in existing roller blanket chains. This invention provides a wear-resistant, distributed roller blanket chain and its preparation method. By configuring differentiated roller lengths to disperse friction positions, it achieves uniform pin wear, balanced chain force, and a flat bearing surface, fundamentally solving the four core problems of existing technologies, extending chain service life, and reducing maintenance costs.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] The present invention proposes a wear-resistant, dispersed roller blanket chain for industrial material conveying, characterized in that it comprises: at least two sets of chain link units connected in series along the conveying direction; each set of chain link units includes at least three chain links arranged in parallel along the width direction.

[0011] Each chain link consists of a pin, inner rollers, outer rollers, inner chain links, outer washers, and an axial locking element. Within each chain link, there are two outer rollers symmetrically positioned on both sides of the inner rollers. The two outer rollers and the inner rollers are coaxially mounted on the same pin. The total axial length of the inner rollers and the two outer rollers is a constant. All chain links have the same overall length, and the center lines of all inner rollers are collinear.

[0012] Within the same chain link unit, the axial lengths of the inner rollers and the axial lengths of the outer rollers are not equal between each chain link;

[0013] At the joint of adjacent chain link units, the inner rollers of the two chain links that are in contact have the same length and the outer rollers have the same length.

[0014] The inner chain link spans two adjacent pins and fits the end faces of the inner and outer rollers, so that the frictional contact positions between the inner chain link and the pins are discretely distributed along the axial direction; the outer gasket is provided in two pieces and is respectively embedded in the center hole of the outer end of the two outer rollers, sleeved on the pins, and axially limited by the axial locking member.

[0015] Preferably, the two inner chain pieces are arranged as a group and symmetrically on both sides of the inner roller; one end of each inner chain piece is fitted onto the pin section between the inner roller and the outer roller on one side of the chain link, and the other end is fitted onto the pin section at the corresponding position of the next adjacent chain link; the axial contact areas of each inner chain piece and the pin do not overlap.

[0016] Preferably, 1 to 6 intermediate rollers are provided on the pin between the inner and outer rollers of a single chain link; the intermediate rollers at corresponding positions of adjacent chain links within the same chain link unit have the same length and their end faces are axially offset by 1 to 5 mm; the intermediate rollers at the joint of adjacent chain link units have the same length and their end faces are axially aligned.

[0017] Preferably, several intermediate rollers on the same link are symmetrically arranged, and the axial lengths of the multiple intermediate rollers between the inner roller and the outer roller on one side are the same or different; the intermediate rollers and the pin are clearance fit, with a radial clearance of 0.03 to 0.08 mm, and can rotate freely.

[0018] Preferably, within the same link unit, the lengths of the inner roller and the outer roller are arranged in a unidirectional increasing or decreasing manner along the width direction of the link, respectively; the length variation between adjacent links is 1 to 8 mm per link.

[0019] Preferably, the pin, inner roller, outer roller, middle roller, and outer washer are all made of high-carbon chromium wear-resistant alloy, with the following weight percentages: C 0.8-1.2%, Cr 1.5-2.5%, Mn 0.3-0.6%, Si 0.2-0.4%, and the balance Fe; tensile strength ≥900MPa, hardness HRC50-58.

[0020] Preferably, the axial locking component is a pin end flange riveting structure with a flange thickness of 1.5-3mm and a diameter 2-4mm larger than the pin diameter; the outer washer, the outer roller end face, and the outer wall of the pin are interference fit with an interference amount of 0.1-0.5mm.

[0021] Preferably, the contact surface between the pin and the inner chain link, as well as the inner and outer surfaces of the inner roller, outer roller, and middle roller, are all coated with a wear-resistant coating; the wear-resistant coating is polyurethane-based, with a thickness of 0.1–0.3 mm and a coefficient of friction ≤0.2.

[0022] This invention discloses a method for manufacturing a wear-resistant, dispersive roller blanket chain, comprising the following steps:

[0023] S1. Prepare the pin, inner roller, outer roller, middle roller, and outer washer respectively. The inner roller, outer roller, and middle roller are prepared in various specifications and lengths according to the drawings for later use.

[0024] S2. The prepared pins, inner rollers, outer rollers, middle rollers, and outer washers are heat-treated to achieve a hardness of HRC50-58.

[0025] S3. Polish the surfaces of the pin, inner roller, outer roller, middle roller, and outer washer; then apply a wear-resistant coating to the contact surface of the pin and the inner and outer surfaces of the inner roller, outer roller, and middle roller.

[0026] S4. According to the design drawings, select inner rollers, middle rollers and outer rollers of the corresponding specifications and lengths, and assemble them with pins, inner chain links and outer washers in sequence to make a single chain link.

[0027] S5. Assemble the next link in the order of link arrangement, so that the inner link connects to the pin of the adjacent link, until multiple sets of link units are formed in series.

[0028] S6. Calibrate the coplanarity of the bearing surface of the entire roller blanket chain to ≤0.5mm / m, and complete the manufacturing.

[0029] The present invention also discloses an industrial material conveying device, comprising: a frame, a drive mechanism, a tensioning mechanism, a guide rail, and the aforementioned wear-resistant dispersed roller chain; the drive mechanism drives the roller chain to circulate, suitable for conveying loads ≤500kg / m and conveying speeds of 0.5~2.5m / s, and is used for conveying blocky or granular materials in building materials, chemical, metallurgical, and mining industries.

[0030] The beneficial effects of this invention are as follows:

[0031] (1) Uniform wear of the pin shaft and significantly extended service life: In this invention, the inner and outer rollers of each link in the same link unit have different lengths, so that the friction contact position between the inner chain piece and the pin shaft is distributed discretely along the axial direction, and the friction load is distributed to different axial areas of the pin shaft, avoiding excessive wear of the pin shaft in some areas, solving the problem of severe local wear and short service life of the existing pin shaft, and greatly improving the service life of the chain.

[0032] (2) Uniform force distribution and significantly improved running stability: In this invention, the differentiated configuration of roller lengths makes the chain run with dispersed and balanced force distribution, avoiding deviation, shaking and jamming caused by concentrated force, solving the existing problems of poor running stability and easy deviation, and ensuring continuous and stable conveying process.

[0033] (3) Flat bearing surface and smooth and efficient material conveying: In this invention, the roller lengths at the joints of adjacent chain links are matched, the bearing surface of the whole chain is flat and there is no height difference, and there is no deviation, falling or jamming when conveying blocky or granular materials, which solves the problem of uneven bearing surface and easy material deviation in the existing system and improves conveying efficiency.

[0034] (4) Dispersed wear and significantly enhanced overall wear resistance: In this invention, the friction load is dispersed and the contact position is discrete, avoiding local concentrated wear, reducing the wear rate of pins, inner chain plates and rollers, improving the overall wear resistance of the chain, reducing maintenance frequency and operation and maintenance costs, and solving the existing problems of concentrated wear and poor overall wear resistance. Attached Figure Description

[0035] Figure 1 : A schematic diagram of the roller blanket chain structure of Embodiment 1 of the present invention;

[0036] Figure 2 : Figure 1 Enlarged view of the structure at point M;

[0037] Figure 3 : Schematic diagram of the roller blanket chain structure in Embodiment 2 of the present invention;

[0038] Figure 4 : Schematic diagram of the roller blanket chain structure in Embodiment 3 of the present invention;

[0039] In the diagram, 1 is the inner chain link, 2 is the pin, 3 is the inner roller, 4 is the outer roller, 41 is the end center hole, 5 is the outer washer, 6 is the axial locking element, and 7 is the middle roller. Detailed Implementation

[0040] The present invention will be further described below with reference to the embodiments. It should be noted that these are merely examples and descriptions of the inventive concept. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the inventive concept or exceed the scope defined in the claims, they should all be considered to fall within the protection scope of the present invention.

[0041] Example 1:

[0042] Combination Figure 1 , Figure 2 This embodiment provides a wear-resistant, dispersed roller blanket chain for industrial material conveying, comprising: at least two sets of chain link units connected in series along the conveying direction; each set of chain link units includes at least three chain links arranged parallel to each other along the width direction. The specific structure is as follows:

[0043] 1. Overall structure and layout:

[0044] like Figure 1 , Figure 2 As shown, the entire roller blanket chain is composed of multiple sets of chain link units with the same or matched structure (such as chain link unit A and chain link unit B) connected in series from end to end along the conveying direction; each set of chain link units has at least three units arranged side by side along the width direction. Figure 1 The six chain links shown have similar structures but different roller lengths, forming a wide conveying surface suitable for conveying blocky and granular materials.

[0045] 2. Composition and shape structure of a single link:

[0046] A single link is the basic unit of a roller blanket chain, such as Figure 1 , Figure 2 As shown, a single link consists of a pin 2, an inner roller 3, an outer roller 4, an inner chain piece 1, an outer washer 5, and an axial locking element 6.

[0047] Among them, the pin 2 is a cylindrical long rod, which is straight in shape. Both ends can be processed into riveting ends, which are used to connect the rollers and inner chain pieces and transmit tension. The surface of the pin 2 is smooth and forms a friction pair with the inner chain piece 1 and the rollers.

[0048] The inner roller 3 is a hollow cylindrical shape, coaxially sleeved in the middle of the pin 2, serving as an intermediate load-bearing and rotating component. The outer wall of the inner roller 3 is the material-bearing contact surface, and the inner wall is clearance-fitted with the pin 2, allowing it to rotate freely.

[0049] There are two outer rollers 4, both of which are hollow cylindrical and are symmetrically placed on both sides of the inner roller 3 and coaxially sleeved on the same pin 2. The two outer rollers 4 are of the same length. The outer end face is used to install the outer washer 5, and the inner end face is in contact with the side of the inner chain piece 1. The inner wall of the outer roller 4 is clearance-fitted with the pin 2 and can rotate freely.

[0050] The inner chain piece 1 has two parts, which are long strip-shaped plate components with round holes at both ends for inserting pins 2 to achieve hinged connection between adjacent chain links; the inner edge of the inner chain piece 1 is in contact with the end face of the roller, and the outer edge is the lateral limiting edge of the chain.

[0051] There are two outer gaskets 5, which are annular circular pieces with a circular hole in the center. Their outer diameter is adapted to the center hole 41 at the end of the outer roller 4. They are fitted into the center hole 41 at the end of the outer roller 4 and sleeved on the pin 2. They are used to axially position the outer roller 4 and disperse the axial force.

[0052] Among them, the axial locking component 6 is a flanged riveting structure at the end of the pin 2. It is formed by turning the material at both ends of the pin 2 outward, and is in the shape of an annular flange with a diameter larger than the rod diameter of the pin 2. It is used to axially lock the outer gasket 5 and prevent the outer gasket 5 and the outer roller 4 from moving axially.

[0053] After a single chain link is assembled: one inner roller 3 is in the center, and two outer rollers 4 are symmetrically located on both sides, with all three coaxially mounted on the same pin 2; the total axial length of the inner roller 3 and the two outer rollers 4 is a fixed value to ensure that the overall length of all chain links is consistent; the center lines of all inner rollers 3 are collinear with P to ensure the overall coaxiality and smooth operation of the chain.

[0054] 3. Differentiated configuration within the link unit:

[0055] Within the same link unit, the axial lengths of the inner rollers 3 and the outer rollers 4 of each link are not equal; that is, the inner rollers 3 and the outer rollers 4 of different links within the same unit are of different lengths, forming a combination of different lengths.

[0056] The links within the same link unit are arranged side by side along the width direction. The inner rollers 3 and outer rollers 4 are of unequal length, so that the contact positions between the inner link 1 and the pin 2 are staggered, non-overlapping, and discretely distributed along the axial direction of the pin 2.

[0057] Within the same link unit, the lengths of the inner roller 3 and the outer roller 4 are arranged in a unidirectional increasing or decreasing direction along the link width, respectively, or in a unidirectional decreasing or increasing direction along the link width, respectively; the length variation between adjacent links is 1 to 8 mm / link, achieving a smooth transition of roller length and uniform dispersion of friction positions.

[0058] By differentiating the roller lengths, the axial contact position of the inner chain link 1 on the pin 2 is forcibly changed, avoiding the concentration of all chain link friction in the same area of ​​the pin 2, thus achieving the dispersion of friction load.

[0059] 4. Link unit docking and matching relationship:

[0060] At the joint of adjacent link units (such as link unit A and link unit B), the inner rollers 3 of the two links are of equal length and the outer rollers 4 are of equal length; that is, the inner and outer roller lengths of the end link of the previous unit and the beginning link of the next unit correspond one-to-one and are perfectly matched.

[0061] When adjacent chain link units are connected, the end faces of the inner roller 3 and the outer roller 4 between the two units are flush and of the same length, ensuring a smooth transition at the chain connection point, no height difference on the bearing surface, no impact or jamming during operation, and ensuring smooth bridging of the inner chain piece 1 at the connection point and balanced force distribution.

[0062] 5. Inner chain plate bridging and frictional dispersion:

[0063] The inner link 1 bridging two adjacent pins 2 and fitting against the end faces of the inner roller 3 and the outer roller 4, so that the frictional contact positions between the inner link 1 and the pin 2 are discretely distributed along the axial direction. The two inner link 1 are symmetrically arranged on both sides of the inner roller 3, that is, one end of each inner link 1 is sleeved on the pin 2 between the inner roller 3 and the outer roller 4 on one side of the link, and the other end is sleeved on the corresponding pin 2 of the next adjacent link, forming a "bridging hinge" structure.

[0064] Because the rollers in the same unit have different lengths, the sleeve position (axial range) of the inner chain piece 1 on the pin 2 changes with the roller length. The axial contact ranges of each inner chain piece 1 and the pin 2 do not overlap, and the friction points are distributed in different axial positions of the pin 2 to avoid local wear.

[0065] 6. External gasket and axial locking structure:

[0066] In each link, there are two outer gaskets 5, which are respectively embedded in the end center holes 41 outside the two outer rollers 4, and are sleeved on the pin 2 and axially limited by the axial locking member 6.

[0067] The outer wall of the outer washer 5 fits tightly against the inner wall of the center hole at the end of the outer roller 4, and the inner hole is adapted to the outer wall of the pin 2. The inner end face of the outer washer 5 fits against the end face of the outer roller 4, and the outer end face fits against the axial locking member 6. The axial locking member 6 is a flanged riveted structure at the end of the pin 2, with a flange thickness of 1.5-3mm and a diameter 2-4mm larger than the diameter of the pin 2. The outer washer 5 isolates the outer roller 4 from the axial locking member 6, reducing end face friction; the outer washer 5, the end face of the outer roller 4, and the outer wall of the pin 2 are interference fit, with an interference amount of 0.1-0.5mm; the axial locking member 6 prevents the outer washer 5 and the outer roller 4 from axially moving, ensuring the stability of the chain structure.

[0068] 7. Other:

[0069] The contact surface between the pin 2 and the inner chain link 1, as well as the inner and outer surfaces of the inner roller 3, outer roller 4, and middle roller 7, are all coated with a wear-resistant coating. The wear-resistant coating is polyurethane-based, with a thickness of 0.1–0.3 mm and a coefficient of friction ≤0.2.

[0070] Pin 2, inner roller 3, outer roller 4, middle roller 7, and outer washer 5 are all made of high-carbon chromium wear-resistant alloy, with the following weight percentages: C 0.8~1.2%, Cr 1.5~2.5%, Mn 0.3~0.6%, Si 0.2~0.4%, and balance Fe; tensile strength ≥900MPa, hardness HRC50~58.

[0071] The wear-resistant, distributed roller chain of this embodiment is suitable for light-load, conventional material conveying scenarios. It has a simple structure and is easy to assemble. By configuring the different lengths of the rollers, the friction positions are discretely distributed, the pins wear evenly, the operation is stable, the bearing surface is flat, and the service life is significantly improved.

[0072] Example 2:

[0073] like Figure 2 As shown, this embodiment provides a wear-resistant distributed roller blanket chain, which adds a middle roller 7 based on embodiment 1. Specifically, one middle roller 7 is added to the pin 2 between the inner roller 3 and the outer roller 4 of a single chain link, and a total of two middle rollers 7 are added to a single chain link.

[0074] The middle roller 7 is a hollow cylindrical shape, coaxially sleeved on the pin 2, located between the inner roller 3 and the outer roller 4, and is used to share the radial load and improve the load-bearing capacity.

[0075] Within the same chain link unit, the corresponding middle rollers 7 of adjacent chain links have the same length and their end faces are axially offset by 2mm; the middle rollers 7 at the joint of adjacent chain link units have the same length and their end faces are axially aligned to ensure that the bearing surface at the joint is flat and to avoid material jamming.

[0076] The two middle rollers 7 on the same link have equal axial lengths and are symmetrically arranged. The middle rollers 7 and the pin 2 are clearance fit with a radial clearance of 0.05mm. They can rotate freely, share the radial load of the chain, reduce the contact stress between the pin 2 and the inner chain piece 1, and further improve the wear resistance and load-bearing capacity.

[0077] Pin 2, inner roller 3, outer roller 4, middle roller 7, and outer washer 5 are all made of high-carbon chromium wear-resistant alloy, and the hardness reaches HRC50~58 after heat treatment. The contact surface between pin 2 and inner chain piece 1, as well as the inner and outer surfaces of inner roller 3, outer roller 4, and middle roller 7, are all coated with a polyurethane-based wear-resistant coating with a thickness of 0.2mm and a friction coefficient ≤0.2, further improving the wear resistance and service life of the chain.

[0078] The remaining structure is the same as in Example 1. This example is suitable for medium-load material conveying scenarios, offering stronger load-bearing capacity, better wear resistance, and improved operational stability.

[0079] Example 3:

[0080] like Figure 3 As shown, this embodiment provides a wear-resistant dispersion roller blanket chain, which, based on embodiment 2, has two intermediate rollers 7 on the pin 2 between the inner roller 3 and the outer roller 4 of a single chain link, that is, a total of four intermediate rollers 7 are provided on a single chain link.

[0081] Within the same chain link unit, the corresponding middle rollers 7 of adjacent chain links have the same length and their end faces are axially offset by 5mm; the middle rollers 7 at the joint of adjacent chain link units have the same length and their end faces are axially aligned to ensure that the bearing surface at the joint is flat and to avoid material jamming.

[0082] The four intermediate rollers 7 on the same link are symmetrically arranged. The axial lengths of the two intermediate rollers 7 on the pin 2 between the inner roller 3 and the outer roller 4 of a single link are unequal. The intermediate rollers 7 and the pin 2 are clearance fit with a radial clearance of 0.08mm. They can rotate freely, share the radial load of the chain, reduce the contact stress between the pin 2 and the inner chain piece 1, and further improve the wear resistance and load-bearing capacity.

[0083] The remaining structure is the same as in Example 2. This example is suitable for heavy-duty, large-volume material conveying scenarios, offering optimal load-bearing capacity, strongest wear resistance, and longest service life.

[0084] Example 4:

[0085] like Figure 2 As shown, this embodiment provides a method for manufacturing a wear-resistant dispersive roller blanket chain, used to manufacture the wear-resistant dispersive roller blanket chain disclosed in Embodiment 2, including the following steps:

[0086] S1. Prepare pin 2, inner roller 3, outer roller 4, middle roller 7, and outer washer 5 respectively. Inner roller 3, outer roller 4, and middle roller 7 are prepared in various specifications and lengths according to the drawings for later use.

[0087] S2. Heat treat the prepared pin 2, inner roller 3, outer roller 4, middle roller 7, and outer washer 5 to make their hardness reach HRC50~58.

[0088] S3. Polish the surfaces of pin 2, inner roller 3, outer roller 4, middle roller 7, and outer washer 5; then apply a wear-resistant coating to the contact surface of pin 2 and the inner and outer surfaces of inner roller 3, outer roller 4, and middle roller 7.

[0089] S4. According to the design drawings, select inner roller 3, middle roller 7, and outer roller 4 of the corresponding specifications and lengths, and assemble them with pin 2, inner chain piece 1, and outer washer 5 in sequence to make a single chain link.

[0090] S5. According to the chain link arrangement order, assemble the next adjacent chain link so that the inner chain piece 1 is connected to the pin 2 of the adjacent chain link, until multiple sets of chain link units are formed in series.

[0091] S6. Calibrate the coplanarity of the bearing surface of the entire roller blanket chain to ≤0.5mm / m, and complete the manufacturing.

[0092] Example 5:

[0093] like Figure 2 As shown, this embodiment provides an industrial material conveying device, including: a frame, a drive mechanism, a tensioning mechanism, a guide rail, and the wear-resistant, dispersed roller chain disclosed in Embodiment 2. The drive mechanism drives the roller chain to circulate, suitable for conveying loads ≤500kg / m and conveying speeds of 0.5~2.5m / s, and is used for conveying blocky or granular materials in building materials, chemical, metallurgical, and mining industries.

[0094] The above is an exemplary description of the invention. Obviously, the specific implementation of the invention is not limited to the above-described manner. Any non-substantial improvement made using the inventive concept and technical solution of the invention, or the direct application of the inventive concept and technical solution to other situations without modification, is within the protection scope of the invention.

Claims

1. A wear-resistant, dispersive roller conveyor chain for industrial material conveying, characterized in that, include: At least two sets of link units are connected in series along the conveying direction; each set of link units contains at least three links arranged in parallel along the width direction; Each chain link consists of a pin (2), an inner roller (3), an outer roller (4), an inner chain piece (1), an outer washer (5), and an axial locking element (6). Within each chain link, there are two outer rollers (4) symmetrically positioned on both sides of the inner roller (3). The two outer rollers (4) and the inner roller (3) are coaxially mounted on the same pin (2). The total axial length of the inner roller (3) and the two outer rollers (4) is a fixed value. All chain links have the same overall length, and the center lines of all inner rollers (3) are collinear. Within the same chain link unit, the axial lengths of the inner rollers (3) and the axial lengths of the outer rollers (4) between each chain link are not equal; At the joint of adjacent chain link units, the inner rollers (3) of the two chain links that are in contact have equal lengths and the outer rollers (4) have equal lengths; The inner chain piece (1) spans two adjacent pins (2) and fits the end faces of the inner roller (3) and the outer roller (4), so that the friction contact positions of the inner chain piece (1) and the pin (2) are distributed discretely along the axial direction; the outer gasket (5) is provided in two and is respectively embedded in the center hole of the outer end of the two outer rollers (4), sleeved on the pin (2) and axially limited by the axial locking member (6).

2. The wear-resistant, dispersive roller blanket chain according to claim 1, characterized in that: Two inner chain pieces (1) are arranged symmetrically on both sides of the inner roller (3); one end of each inner chain piece (1) is fitted on the pin (2) section between the inner roller (3) and the outer roller (4) on one side of the chain link, and the other end is fitted on the corresponding pin (2) section of the next adjacent chain link; the axial contact areas of each inner chain piece (1) and the pin (2) do not overlap.

3. The wear-resistant, dispersive roller blanket chain according to claim 1, characterized in that: One to six middle rollers (7) are provided on the pin (2) between the inner roller (3) and the outer roller (4) of a single chain link; the middle rollers (7) at corresponding positions of adjacent chain links in the same chain link unit have the same length and their end faces are axially offset by 1 to 5 mm; the middle rollers (7) at the joint of adjacent chain link units have the same length and their end faces are axially aligned.

4. The wear-resistant, dispersive roller blanket chain according to claim 3, characterized in that: Several intermediate rollers (7) on the same link are symmetrically arranged, and the axial lengths of the multiple intermediate rollers (7) between the inner roller (3) and the outer roller (4) on one side are the same or different; the intermediate rollers (7) and the pin (2) are clearance fit, with a radial clearance of 0.03 to 0.08 mm, and can rotate freely.

5. The wear-resistant, dispersive roller blanket chain according to claim 1, characterized in that: Within the same link unit, the lengths of the inner roller (3) and the outer roller (4) are arranged in a unidirectional increasing or decreasing manner along the width direction of the link, or in a unidirectional decreasing or increasing manner along the width direction of the link, respectively; the length variation between adjacent links is 1 to 8 mm / link.

6. The wear-resistant, dispersive roller blanket chain according to claim 1, characterized in that: The pin (2), inner roller (3), outer roller (4), middle roller (7), and outer washer (5) are all made of high-carbon chromium wear-resistant alloy, with the following weight percentages: C 0.8~1.2%, Cr 1.5~2.5%, Mn 0.3~0.6%, Si 0.2~0.4%, and the balance Fe; tensile strength ≥900MPa, hardness HRC50~58.

7. The wear-resistant, dispersive roller blanket chain according to claim 1, characterized in that: The axial locking component (6) is a flanged riveting structure at the end of the pin (2), with a flange thickness of 1.5 to 3 mm and a diameter 2 to 4 mm larger than the diameter of the pin (2); the outer gasket (5) and the end face of the outer roller (4) and the outer wall of the pin (2) are interference fit, with an interference amount of 0.1 to 0.5 mm.

8. The wear-resistant, dispersive roller blanket chain according to claim 1, characterized in that: The contact surface between the pin (2) and the inner chain (1), as well as the inner and outer surfaces of the inner roller (3), outer roller (4), and middle roller (7), are all coated with a wear-resistant coating; the wear-resistant coating is polyurethane-based, with a thickness of 0.1 to 0.3 mm and a friction coefficient ≤ 0.

2.

9. A method for manufacturing a wear-resistant, dispersive roller blanket chain, characterized in that, The method for manufacturing the wear-resistant dispersion roller blanket chain according to any one of claims 1 to 8 comprises the following steps: S1. Prepare pins (2), inner rollers (3), outer rollers (4), middle rollers (7), and outer washers (5) respectively. Inner rollers (3), outer rollers (4), and middle rollers (7) are prepared in various specifications and lengths according to the drawings for later use. S2. Heat-treat the prepared pin (2), inner roller (3), outer roller (4), middle roller (7), and outer washer (5) to make their hardness reach HRC50~58; S3. Polish the surfaces of the pin (2), inner roller (3), outer roller (4), middle roller (7), and outer washer (5); then apply a wear-resistant coating to the contact surface of the pin (2) and the inner and outer surfaces of the inner roller (3), outer roller (4), and middle roller (7). S4. According to the design drawings, select inner rollers (3), middle rollers (7), and outer rollers (4) of the corresponding specifications and lengths, and assemble them with pins (2), inner chain pieces (1), and outer washers (5) in sequence to make a single chain link; S5. According to the chain link arrangement order, assemble the next adjacent chain link so that the inner chain piece (1) connects to the pin (2) of the adjacent chain link until multiple sets of chain link units are connected in series. S6. Calibrate the coplanarity of the bearing surface of the entire roller blanket chain to ≤0.5mm / m, and complete the manufacturing.

10. An industrial material conveying device, characterized in that, include: The frame, drive mechanism, tensioning mechanism, guide rail, and wear-resistant dispersion roller chain as described in any one of claims 1 to 8; The drive mechanism drives the roller chain to rotate in a cycle, and is suitable for conveying loads ≤500kg / m and conveying speeds of 0.5~2.5m / s. It is used for conveying block or granular materials in building materials, chemical, metallurgical and mining industries.

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