A closed-track accumulation chain system

Abstract

This invention relates to the field of transportation equipment technology, and in particular to a closed-track accumulation chain system, comprising a profile track, trolleys, accumulation devices, and a chain. Several trolleys are arranged along the extension path of the profile track and slidably mounted on it. Several accumulation devices are correspondingly mounted on each trolley. The chain is disposed within the profile track. This invention incorporates a short bushing. Because the short bushing is configured such that whenever its corresponding chain link unit moves to a preset position on the profile track, the short bushing rotates circumferentially by a preset angle relative to the chain link unit, the circumferential force position of the short bushing changes compared to the previous rotation. This avoids prolonged stress on a localized circumferential position of the short bushing, thereby preventing circumferential wear and ensuring the transmission accuracy and stability of the chain.

Description

Technical Field

[0001] This invention relates to the field of transportation equipment technology, and in particular to a closed-track accumulation chain system. Background Technology

[0002] With the rapid development of modern manufacturing towards intelligence, flexibility, and efficiency, automated material handling systems have become an indispensable core component of production lines. In numerous industries such as automobile manufacturing, home appliance assembly, logistics sorting, and food and pharmaceuticals, higher demands are being placed on the precise, continuous, and controllable transport of materials. Traditional conveying methods (such as belt conveyors and roller conveyors) have limitations in terms of flexibility, load-bearing capacity, space utilization, and accumulation capabilities, making it difficult to meet the cycle control and buffer storage requirements under complex operating conditions. Therefore, advanced conveying systems with accumulation capabilities (i.e., the ability to temporarily store and release workpieces on demand during transport) have emerged, and the closed-track accumulation chain system is a highly efficient solution developed in this context.

[0003] The enclosed-track accumulation chain includes a profile track, a chain, a trolley, and an accumulation device. The chain is located inside the profile track and maintains continuous unidirectional transmission under the drive of the drive device. The trolley slides on the profile track, and the accumulation device is connected between the trolley and the chain to realize the connection or separation between the trolley and the chain, thereby completing the "run-stop-accumulate-release" cycle control and meeting the production needs of multi-station buffering and cycle time matching.

[0004] During use, when the trolley loaded with materials is connected to the chain, the load on the connection point between the chain and the trolley increases sharply. This causes a momentary sway in the chain, resulting in excessive circumferential local stress at the connection point between the chain links and the pins. Since the chain is a unidirectional continuous transmission, this cumulative stress over a long period of time will cause circumferential wear on the chain links and pins, thus affecting the transmission accuracy and stability of the chain. Summary of the Invention

[0005] Therefore, it is necessary to provide a closed-track accumulation chain system to address the problems existing in current accumulation chain systems, in order to solve the problem that existing accumulation chain systems are prone to circumferential wear of chain links and pins, which affects the accuracy and stability of chain transmission.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A closed-track accumulation chain system includes:

[0008] Profile rails;

[0009] Several trolleys are arranged along the extension path of the profile track and slide on the profile track;

[0010] Several accumulators are correspondingly installed on each trolley;

[0011] The chain is configured within the profile track and is capable of circumferential transmission along the extension path of the profile track;

[0012] The chain includes several chain link units, pins, short bushings, and positioning rollers. The chain link units are connected in a loop through the short bushings. The short bushings are configured such that when the corresponding chain link unit moves to a preset position on the profile track, the short bushing rotates circumferentially by a preset angle relative to the chain link unit. The pins are rotatably located inside the short bushings, and both ends of the pins protrude from the ends of the short bushings. The positioning rollers are rotatably located at both ends of the pins and are connected to the inner wall raceway of the profile track.

[0013] Preferably, the link unit includes a link head and two link plates, the two link plates are arranged in parallel and spaced apart, the same end of the two link plates is rotatably connected to the link head, the same other end of the two link plates is rotatably connected to the link head corresponding to the adjacent link unit through a short bushing, the other end of the link head is rotatably connected to the link plate corresponding to the adjacent link unit through a short bushing, and the link heads corresponding to two adjacent link units are circumferentially offset by ninety degrees.

[0014] Preferably, a first gear is coaxially provided at one end of the short bushing, and a first toothed plate is provided at a preset position on the profile track. The length of the first toothed plate is less than the circumference of the first gear. Whenever the chain link unit corresponding to the short bushing moves to the preset position on the profile track, the first gear corresponding to the short bushing meshes with the first toothed plate.

[0015] Preferably, a long bushing is fitted between the short bushing and the pin. The long bushing can rotate circumferentially relative to the short bushing and move along the axis of the short bushing. The long bushing is divided into a normal pressure fit section and an overpressure fit section in sequence along its axial direction. The diameter of the overpressure fit section is smaller than the diameter of the normal pressure fit section. Several elastic strips are evenly spaced on the outer circumference of the overpressure fit section. The elastic strips can deform radially along the long bushing.

[0016] Preferably, the end of the long bushing away from the overpressure fitting section in the axial direction is provided with a wear fitting section, the diameter of which is larger than the diameter of the normal pressure fitting section.

[0017] Preferably, a second gear is coaxially provided at one end of the long bushing, and a second toothed plate is also provided at a preset position of the profile track. The length of the second toothed plate is greater than the length of the first toothed plate and less than the circumference of the second gear.

[0018] Preferably, a drive assembly is provided on the profile track for driving the long bushing to move along its axis.

[0019] Preferably, an oil sprayer is installed inside the profile track for spraying lubricating oil onto the overpressure mating section of the long bushing.

[0020] Preferably, a one-way scraper ring is provided on the inner peripheral wall of the short bushing. When the long bushing switches from the overpressure fit section to the normal pressure fit section, the one-way scraper ring is used to scrape off the oil stains on the surface of the normal pressure fit section.

[0021] Preferably, the short bushing is rotatably mounted on the chain plate.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention incorporates a short bushing. Since the short bushing connects the chain link unit and the pin, it acts as an intermediate force transmission component, capable of bearing significant pressure to reduce wear on the pin and chain link unit. Furthermore, because the short bushing is configured to rotate circumferentially by a preset angle relative to the chain link unit whenever its corresponding chain link unit moves to a preset position on the profile track, the circumferential force-bearing position of the short bushing changes compared to the previous position. This prevents prolonged stress on localized circumferential areas of the short bushing, thereby preventing circumferential wear and ensuring the transmission accuracy and stability of the chain.

[0024] 2. This invention incorporates a long bushing. When the load increases rapidly, the overpressure fitting section of the long bushing engages with the short bushing. Since the diameter of the overpressure fitting section is smaller than the inner diameter of the short bushing, and several elastic strips are evenly spaced on the outer circumference of the overpressure fitting section, and these elastic strips can deform radially along the long bushing, the instantaneous force is absorbed by the elastic deformation of the elastic strips and converted into elastic potential energy. This reduces the force on both the long and short bushings, preventing them from being subjected to excessive force for extended periods and causing wear. This improves the transmission accuracy of the chain and extends its service life. After the chain link unit passes the preset position, the long bushing returns to its original position, and the normal pressure fitting section engages with the short bushing again to ensure the smoothness and accuracy of the chain transmission. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a closed-track accumulation chain system according to the present invention;

[0026] Figure 2 for Figure 1 The left view;

[0027] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle;

[0028] Figure 4 for Figure 2 BB section view;

[0029] Figure 5 for Figure 1 Exploded view;

[0030] Figure 6This is a schematic diagram of the structure of the accumulator in a closed-track accumulator chain system according to the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the drive component in a closed-track accumulation chain system according to the present invention.

[0032] Figure 8 This is a schematic diagram of the structure of the first toothed plate and the second toothed plate in a closed-track accumulation chain system of the present invention;

[0033] Figure 9 This is a front view of a link unit in a closed-track accumulation chain system according to the present invention;

[0034] Figure 10 for Figure 9 CC section view;

[0035] Figure 11 for Figure 10 A magnified schematic diagram of the structure at point D;

[0036] Figure 12 This is an exploded view of a link unit in a closed-track accumulation chain system of the present invention;

[0037] Figure 13 This is a schematic diagram of the structure of the connecting head and chain plate in a closed-track accumulation chain system of the present invention;

[0038] Figure 14 This is a schematic diagram showing the location of the damping hole in a closed-track accumulation chain system according to the present invention;

[0039] Figure 15 This is a schematic diagram of the unidirectional scraper ring in a closed-track accumulation chain system of the present invention.

[0040] in:

[0041] 100. Profile rail; 110. First toothed plate; 120. Second toothed plate;

[0042] 200. Car;

[0043] 300. Accumulator; 310. Telescopic column; 320. Extension rod;

[0044] 400, Chain; 410, Chain Link Unit; 420, Pin; 430, Short Bushing; 440, Positioning Roller; 450, First Gear; 460, Long Bushing; 470, Second Gear; 480, One-Way Scraper Ring;

[0045] 411. Connector head; 412. Chain plate;

[0046] 431. Damping orifice; 432. Rubber damping post;

[0047] 461. Normal pressure fit section; 462. Overpressure fit section; 463. Spring clip; 464. Wear fit section;

[0048] 500. Drive assembly; 510. Linear drive element; 520. Clamping jaws;

[0049] 600. Injector. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0051] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It is understandable that when the circumferential wear of the link unit 410 and the pin 420 is severe, both the hole on the link unit 410 for mounting the pin 420 and the pin 420 itself become elliptical. This is equivalent to a change in the length of the chain 400, thus reducing the transmission accuracy and stability of the chain 400. To solve this problem, this invention discloses a closed-track accumulation chain system, such as... Figures 1 to 15As shown, a closed-track accumulation chain system includes a profile track 100, trolleys 200, accumulation devices 300, and a chain 400. Several trolleys 200 are arranged along the extension path of the profile track 100 and slidably mounted on it. Several accumulation devices 300 are correspondingly mounted on each trolley 200. The chain 400 is disposed within the profile track 100 and is capable of circumferential transmission along the extension path of the profile track 100. The chain 400 includes several chain link units 410, pins 420, and short bushings. A sleeve 430 and a positioning roller 440 are provided. Several chain link units 410 are connected in a ring by the short sleeve 430. The short sleeve 430 is configured such that whenever its corresponding chain link unit 410 moves to a preset position on the profile track 100, the short sleeve 430 rotates circumferentially by a preset angle relative to the chain link unit 410. The pin 420 is rotatably disposed inside the short sleeve 430, and both ends of the pin 420 protrude from the ends of the short sleeve 430. The positioning roller 440 is rotatably disposed at both ends of the pin 420, and the positioning roller 440 is connected to the inner wall raceway of the profile track 100.

[0054] During use, the chain 400 is driven by the drive mechanism to continuously transmit circumferentially along the extension path of the profile track 100. During this process, when each link unit 410 of the chain 400 rotates to the front of the loading area corresponding to the profile track 100 (i.e., the preset position), the accumulator 300 corresponding to the trolley 200 at the front of the loading area connects the current trolley 200 with the link unit 410. At this time, the trolley 200 loaded with material moves synchronously with the chain 400. When the chain 400 drives the trolley 200 to move until the trolley 200 abuts against the trolley 200 at the back of the accumulation area, the accumulator 300 no longer connects to the trolley 200. At this time, the trolley 200 stops in the accumulation area (the accumulation area is used to accumulate the trolley 200 loaded with material). When a feeding instruction is received, the trolley 200 at the front of the accumulation area is connected to the corresponding chain link unit 410 through the accumulator 300. At this time, the chain 400 drives the trolley 200, which is loaded with material, to the feeding position to complete the feeding. After the trolley 200 has finished feeding, the chain 400 drives the empty trolley 200 to continue moving until the trolley 200 comes into contact with the trolley 200 at the back of the loading area. At this time, the accumulator 300 no longer connects the trolley 200 and the chain link unit 410. The empty trolley 200 is piled up in the loading area (the loading area is used to accumulate the empty trolley 200 and fill it with material) to receive the material. In this way, the entire cycle of "run-stop-accumulate-release" is completed.

[0055] During the above process, whenever the link unit 410 connects to the trolley 200 at the preset position, the load on the link unit 410 increases sharply and instantaneously. After a brief stop, the link unit 410 moves forward. Since the short bushing 430 is connected between the link unit 410 and the pin 420, the short bushing 430, as an intermediate force transmission component, can bear greater pressure to reduce the wear of the pin 420 and the link unit 410. At the same time, since the short bushing 430 is configured to rotate circumferentially by a preset angle relative to the link unit 410 whenever its corresponding link unit 410 moves to the preset position of the profile track 100, the circumferential force position of the short bushing 430 changes compared to the previous one during the continuous operation of the chain 400. This avoids the short bushing 430 being subjected to force in a localized circumferential position for a long time, thereby preventing the short bushing 430 from experiencing circumferential wear and ensuring the transmission accuracy and stability of the chain 400.

[0056] Furthermore, the drive mechanism includes a high-power motor and a sprocket. The sprocket is mounted on the output shaft of the high-power motor and is used to drive the sprocket to rotate. The sprocket is connected to the chain 400 for transmission, thereby realizing the circumferential rotation of the chain 400.

[0057] It should be added that, as Figure 12 As shown, positioning rollers 440 are provided at both ends of the pin 420, and the positioning rollers 440 are connected to the inner wall raceway of the profile track 100 in order to position the chain link unit 410 and prevent the chain link unit 410 from swinging during use.

[0058] Furthermore, such as Figure 6 As shown, the accumulator 300 includes a telescopic column 310 and an extension rod 320. The telescopic column 310 is mounted on the trolley 200, and the extension rod 320 is mounted on the chain link unit 410. When the chain 400 needs to drive the trolley 200 to move, the telescopic column 310 is in an extended state. When the chain link unit 410 moves to the point where the extension rod 320 abuts against the telescopic column 310, the chain link unit 410 pushes the trolley 200 to move synchronously. When the chain link unit 410 and the trolley 200 need to be disengaged, the telescopic column 310 retracts into the trolley 200. At this time, the telescopic column 310 no longer interferes with the extension rod 320, and the extension rod 320 passes over the position of the trolley 200.

[0059] In a further embodiment, such as Figure 12 and Figure 13As shown, the link unit 410 includes a link head 411 and two link plates 412. The two link plates 412 are arranged in parallel and spaced apart. The same end of the two link plates 412 is rotatably connected to the link head 411. The same other end of the two link plates 412 is rotatably connected to the link head 411 corresponding to the adjacent link unit 410 through a short bushing 430. The other end of the link head 411 is rotatably connected to the link plate 412 corresponding to the adjacent link unit 410 through a short bushing 430. The link heads 411 corresponding to the two adjacent link units 410 are arranged with a circumferential ninety-degree offset.

[0060] It is understandable that by making the link heads 411 corresponding to two adjacent link units 410 circumferentially offset by ninety degrees, the purpose is to increase the transmission freedom of the chain 400 in order to adapt to the complex track shape of the profile track 100.

[0061] It should be noted that a short bushing 430 is also provided at the rotatable connection between the link head 411 and the chain plate 412 in each link unit 410. Similarly, a pin 420 is also rotatably provided inside the short bushing 430 to form an internal support for the short bushing 430 and prevent the short bushing 430 from deforming when subjected to force.

[0062] Since the connecting heads 411 corresponding to two adjacent link units 410 are circumferentially offset by ninety degrees, the axes of two adjacent pins 420 are perpendicular to each other. Each pin 420 has a positioning roller 440 at both ends, and each positioning roller 440 is connected to the inner wall raceway of the profile track 100. This further restricts the degree of freedom of the link unit 410 to adapt to the complex track shape of the profile track 100.

[0063] In a further embodiment, such as Figure 3 , Figure 8 and Figure 11 As shown, a first gear 450 is coaxially provided at one end of the short bushing 430, and a first toothed plate 110 is provided at a preset position of the profile track 100. The length of the first toothed plate 110 is less than the circumference of the first gear 450. Whenever the chain link unit 410 corresponding to the short bushing 430 moves to the preset position of the profile track 100, the first gear 450 corresponding to the short bushing 430 meshes with the first toothed plate 110.

[0064] When the link unit 410 moves to the preset position, the first gear 450 on the short bushing 430 corresponding to the link unit 410 meshes with the first toothed plate 110. At this time, the first gear 450 rotates circumferentially. Since the first gear 450 and the short bushing 430 are coaxially fixedly connected, the short bushing 430 rotates synchronously. Since the length of the first toothed plate 110 is less than the circumference of the first gear 450, the angle of rotation of the first gear 450 each time is less than 360°. The length of the first toothed plate 110 is preferably equal to one-quarter of the circumference of the first gear 450. This makes the circumferential force position of the short bushing 430 change compared to the previous one, thereby avoiding the short bushing 430 from being subjected to force in a local circumferential position for a long time, and thus preventing the short bushing 430 from having circumferential wear problems, thereby ensuring the transmission accuracy and transmission stability of the chain 400.

[0065] Furthermore, such as Figure 13 and Figure 14 As shown, the short bushing 430 is rotatably mounted on the chain plate 412. Specifically, radial holes are formed in the mounting holes on the chain plate 412 and the connecting head 411. A rubber damping post 432 is installed in the radial hole, with one end of the rubber damping post 432 facing the center being a ball head, which extends out of the radial hole. Correspondingly, a plurality of damping holes 431 are equally spaced circumferentially on the outer circumferential surface of the short bushing 430, and the diameter of the damping holes 431 is adapted to the diameter of the ball head damping post. When the first gear 450 is not meshed with the first gear plate 110, the damping engagement between the damping holes 431 and the rubber damping post 432 can prevent the short bushing 430 from rotating unexpectedly under force.

[0066] In a further embodiment, such as Figure 11 As shown, a long bushing 460 is fitted between the short bushing 430 and the pin 420. The long bushing 460 can rotate circumferentially relative to the short bushing 430 and move along the axis of the short bushing 430. The long bushing 460 is axially divided into a normal pressure fit section 461 and an overpressure fit section 462. The diameter of the overpressure fit section 462 is smaller than the diameter of the normal pressure fit section 461. A number of elastic strips 463 are evenly spaced on the outer circumference of the overpressure fit section 462. The elastic strips 463 can deform radially along the long bushing 460.

[0067] Before the link unit 410 moves to the preset position, the normal pressure fit section 461 of the long bushing 460 contacts the inner peripheral wall of the short bushing 430. Since the diameter of the normal pressure fit section 461 is adapted to the inner diameter of the short bushing 430 (transition fit), there is no clearance between the pin 420, the short bushing 430, and the long bushing 460 before the link unit 410 moves to the preset position, which ensures transmission smoothness and transmission accuracy. When the link unit 410 moves to the preset position, the long bushing 460 moves a preset distance along its axis so that the overpressure fit section 462 contacts the inner peripheral wall of the short bushing 430, thereby changing the axial force position of the long bushing 460. At this time, the instantaneous force generated by the rapid increase in load of the link unit 410 acts on the overpressure fit section 462. The diameter of 2 is smaller than the inner diameter of the short bushing 430, and several elastic strips 463 are evenly spaced on the outer circumference of the overpressure fitting section 462. The elastic strips 463 can deform radially along the long bushing 460, so the elastic strips 463 have deformable space. At this time, the instantaneous force is absorbed by the elastic deformation of the elastic strips 463 and converted into the elastic potential energy of the elastic strips 463. Therefore, the force on the long bushing 460 and the short bushing 430 can be reduced, preventing the long bushing 460 and the short bushing 430 from being worn due to excessive force for a long time. This improves the transmission accuracy of the chain 400 and extends the service life of the chain 400. After the chain link unit 410 passes the preset position, the long bushing 460 is reset. At this time, the normal pressure fitting section 461 contacts and fits with the short bushing 430 again to ensure the transmission stability and transmission accuracy of the chain 400.

[0068] To prevent localized circumferential wear between the short bushing 430 and the long bushing 460, such as Figure 11 As shown, in a further embodiment, a second gear 470 is coaxially provided at one end of the long bushing 460. The diameter of the second gear 470 is the same as the diameter of the first gear 450. A second toothed plate 120 is also provided at a preset position of the profile track 100. The length of the second toothed plate 120 is greater than the length of the first toothed plate 110 and less than the circumference of the second gear 470. It should be explained that the length of the second toothed plate 120 is greater than the length of the first toothed plate 110 so that the second gear 470 and the first gear 450 rotate at different angles each time, so that the first gear 450 and the second gear 470 can rotate relative to each other in the circumferential direction by a preset angle. The length of the second toothed plate 120 is less than the length of the second gear 470 so that the angle of rotation of the second gear 470 each time is less than 360°, that is, the angle of rotation of the long bushing 460 each time is less than 360°.

[0069] When the link unit 410 moves to the preset position, the second gear 470 on the long bushing 460 corresponding to the link unit 410 meshes with the second toothed plate 120. At this time, the second gear 470 rotates circumferentially. Since the second gear 470 and the long bushing 460 are coaxially fixedly connected, the long bushing 460 rotates synchronously. Because the length of the second toothed plate 120 is less than the circumference of the second gear 470, the angle of rotation of the second gear 470 each time is less than 360°. This makes the circumferential force position of the long bushing 460 change compared to the previous time. Since the circumferential rotation angle of the long bushing 460 and the short bushing 430 is different each time, the short bushing 430 and the long bushing 460 rotate relative to each other at a certain angle each time the link unit 410 moves to the preset position, thereby preventing local circumferential wear between the short bushing 430 and the long bushing 460.

[0070] Furthermore, such as Figure 3 , Figure 5 and Figure 7 As shown, in order to enable the long bushing 460 to move along its axis, a drive assembly 500 is provided on the profile track 100 to drive the long bushing 460 to move along its axis. Specifically, the drive assembly 500 includes a linear drive element 510 and a clamp 520. The linear drive element 510 is slidably disposed on the profile track 100. The linear drive element 510 can be any component with linear drive function, such as a cylinder, hydraulic cylinder, or electric telescopic rod. The sliding direction of the linear drive element 510 is consistent with the movement direction of the chain 400 at the current position. The driving direction of the linear drive element 510 is parallel to the axis of the second gear 470. The clamp 520 is disposed on the telescopic end of the linear drive element 510, and the position of the clamp 520 corresponds to the position of the second gear 470, so that when the chain link unit 410 moves to the preset position, the second gear 470 corresponding to the chain link unit 410 is exactly located in the clamp 520.

[0071] When each link unit 410 moves to the preset position, the telescopic end of the linear drive element 510 extends. Since the driving direction of the linear drive element 510 is parallel to the axis of the second gear 470, the telescopic end of the linear drive element 510 pushes the jaw clamp 520 to move synchronously along the axis of the second gear 470. Since the second gear 470 corresponding to the link unit 410 is located in the jaw of the jaw clamp 520, the jaw clamp 520 pushes the second gear 470 to move synchronously. Since the second gear 470 is coaxially fixedly connected to the long bushing 460, the long bushing 460 moves synchronously along its own axis, so that the long bushing 460 moves from the axial position where the normal pressure fitting section 461 and the short bushing 430 are engaged to the axial position where the overpressure fitting section 462 and the short bushing 430 are engaged.

[0072] In a further embodiment, such as Figure 1 As shown, an oil sprayer 600 is installed inside the profile track 100 for spraying lubricating oil onto the overpressure mating section 462 on the long bushing 460.

[0073] When the overpressure fitting section 462 mates with the outer peripheral surface of the short bushing 430, the lubricating oil can lubricate the contact surface between the overpressure fitting section 462 and the short bushing 430 to reduce wear. In addition, the lubricating oil can also absorb the heat generated during the elastic deformation of the spring 463 to reduce the elastic deformation of the spring 463, convert potential energy into internal energy, and improve energy consumption.

[0074] Specifically, the injector 600 can be set at or before a preset position on the profile track 100. A photoelectric sensor is installed at the injection port of the injector 600 to detect when the overpressure mating section 462 moves to its corresponding position. When the light signal emitted by the photoelectric sensor is reflected by the overpressure mating section 462 and received by the photoelectric sensor, the photoelectric sensor controls the injector 600 to inject oil once to lubricate the surface of the overpressure mating section 462.

[0075] In a further embodiment, such as Figure 15 As shown, a one-way scraper ring 480 is provided on the inner peripheral wall of the short bushing 430. The one-way scraper ring 480 is conical and made of a flexible material, such as soft plastic or rubber. When the long bushing 460 switches from the overpressure mating section 462 to the normal pressure mating section 461, the one-way scraper ring 480 is used to scrape off the oil stains on the surface of the normal pressure mating section 461.

[0076] When the atmospheric pressure mating section 461 extends from the short bushing 430, the one-way scraper ring 480 is pushed radially outward by the atmospheric pressure mating section 461, exposing the atmospheric pressure mating section 461 along with the oil stains on its surface. When the atmospheric pressure mating section 461 retracts back into the short bushing 430, the one-way scraper ring 480 is pushed radially inward by the atmospheric pressure mating section 461, preventing the oil stains on the surface of the atmospheric pressure mating section 461 from returning with the short bushing 430. At this time, the one-way scraper ring 480 scrapes off the oil stains on the surface of the atmospheric pressure mating section 461, preventing the oil stains from affecting the lubrication effect of the newly added lubricating oil.

[0077] As the cumulative usage time of chain 400 increases, the diameter of the pressure-fit section 461 of the long bushing 460 will decrease due to wear. This will create a gap between the long bushing 460 and the short bushing 430, causing a decrease in the transmission stability and accuracy of chain 400. To solve this problem, such as... Figure 11 As shown, in a further embodiment, the end of the long bushing 460 that is axially away from the overpressure fitting section 462 is provided with a wear fitting section 464, the diameter of which is larger than the diameter of the normal pressure fitting section 461.

[0078] When the cumulative running time of the chain 400 reaches the preset time or the diameter of the normal pressure mating section 461 is found to decrease to less than the lower limit during regular maintenance, the initial mating position of the long bushing 460 and the short bushing 430 is changed so that, in the initial state, the overpressure mating section 462 and the short bushing 430 are mated. Specifically, the drive assembly 500 pushes the second gear 470 to move so that, in the initial state, the wear mating section 464 and the outer peripheral surface of the short bushing 430 rotate into contact. Since the diameter of the wear mating section 464 is larger than the diameter of the normal pressure mating section 461, there is no gap between the two after the wear mating section 464 and the outer peripheral surface of the short bushing 430 rotate into contact, which can ensure the transmission stability and transmission accuracy of the chain 400.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A closed-track accumulation chain system, characterized in that, include: Profile rails; Several trolleys are arranged along the extension path of the profile track and slide on the profile track; Several accumulators are correspondingly installed on each trolley; The chain is configured within the profile track and is capable of circumferential transmission along the extension path of the profile track; The chain comprises several chain link units, a pin, short bushings, and positioning rollers. The chain link units are connected end-to-end in a loop via short bushings. The short bushings are configured such that when their corresponding chain link unit moves to a preset position on the profile track, the short bushing rotates circumferentially by a preset angle relative to the chain link unit. The pin is rotatably located within the short bushing, with both ends protruding from the ends of the short bushing. Positioning rollers are rotatably located at both ends of the pin and are connected to the inner wall raceway of the profile track. Each chain link unit includes a connecting head and two chain plates. The two chain plates are arranged parallel and spaced apart, with the same end of each chain plate rotating with the connecting head. The connection involves two chain plates, each with its other end rotatably connected to the corresponding link head of an adjacent chain link unit via a short bushing. The other end of the link head is rotatably connected to the chain plate corresponding to an adjacent chain link unit via a short bushing, and the link heads corresponding to two adjacent chain link units are circumferentially offset by ninety degrees. One end of the short bushing is coaxially provided with a first gear, and a first toothed plate is provided at a preset position on the profile track. The length of the first toothed plate is less than the circumference of the first gear. Whenever the chain link unit corresponding to the short bushing moves to the preset position on the profile track, the first gear corresponding to the short bushing meshes with the first toothed plate.

2. The closed-track accumulation chain system according to claim 1, characterized in that, A long bushing is fitted between the short bushing and the pin. The long bushing can rotate circumferentially relative to the short bushing and move along the axis of the short bushing. The long bushing is divided into a normal pressure fit section and an overpressure fit section in sequence along its axial direction. The diameter of the overpressure fit section is smaller than that of the normal pressure fit section. Several elastic bars are evenly spaced on the outer circumference of the overpressure fit section. The elastic bars can deform radially along the long bushing.

3. The closed-track accumulation chain system according to claim 2, characterized in that, The long bushing has a wear fit section at the axial end away from the overpressure fit section, and the diameter of the wear fit section is larger than the diameter of the normal pressure fit section.

4. The closed-track accumulation chain system according to claim 2, characterized in that, A second gear is coaxially provided at one end of the long bushing, and a second toothed plate is also provided at the preset position of the profile track. The length of the second toothed plate is greater than the length of the first toothed plate and less than the circumference of the second gear.

5. A closed-track accumulation chain system according to claim 2, characterized in that, A drive assembly is provided on the profile track to drive the long bushing to move along its axis.

6. A closed-track accumulation chain system according to claim 2, characterized in that, An oil sprayer is installed inside the profile track to spray lubricating oil onto the overpressure mating section of the long bushing.

7. A closed-track accumulation chain system according to claim 6, characterized in that, A one-way scraper ring is provided on the inner circumferential wall of the short bushing. When the long bushing switches from the overpressure fit section to the normal pressure fit section, the one-way scraper ring is used to scrape off the oil stains on the surface of the normal pressure fit section.

8. A closed-track accumulation chain system according to claim 1, characterized in that, The short bushing is rotatably mounted on the chain plate.

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