Vertical sliding rail type stocker drag chain mechanism

Abstract

The invention relates to the technical field of stacking machines, in particular to a vertical sliding rail type stacking machine drag chain mechanism which comprises a sliding rail, a sliding block is arranged on the sliding rail in a sliding mode, a bearing wheel is rotationally arranged on one side of the sliding block, and a drag chain body is rotationally connected to the bottom side of the bearing wheel. The two ends of the drag chain body are fixedly connected with connecting mechanisms, and limiting protection plates are arranged on the two sides of the drag chain body. Sliding of the drag chain body can be guided through the sliding blocks and the sliding rails, the stress direction of the drag chain body can be changed through the bearing wheels, meanwhile, the bending radius of the drag chain body is limited, one end of the drag chain body can be in a straightened state in the sliding process under the interaction of traction force of a cargo carrying table of the stacking machine and gravity of the bearing wheels, and the drag chain body can be straightened. The limiting protection plate can prevent the bending radius of the drag chain body from being too large in the downward sliding process of the cargo carrying table of the stacking machine, then the bending radius of the drag chain body is limited within a certain range, the risk that a cable and a hose are excessively bent and damaged is effectively reduced, and meanwhile friction between the drag chain body and other parts can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of stackers, in particular to a drag chain mechanism of a vertical slide rail type stacker. Background Art

[0002] The vertical slide rail stacker is a device used for automated vertical storage and retrieval of goods. The drag chain is mainly used to protect and support the cables, air pipes and other hoses required by the stacker during operation to prevent them from being damaged by stretching, squeezing or abrasion. At the same time, the drag chain can also ensure that these hoses remain neat and orderly when the stacker moves, without affecting the normal operation of the equipment. Therefore, the drag chain mechanism plays a key role in the operation of the equipment.

[0003] According to the stacker drag chain device disclosed in the Chinese patent document with the announcement number CN217152844U, a limiting part surrounded by a first steel wire rope, a second steel wire rope and a third steel wire rope is used to limit the freedom of the drag chain during operation, and the contact area with the drag chain is reduced while ensuring the limiting function during the operation of the drag chain, which significantly reduces the noise generated by friction during the operation of the drag chain and effectively optimizes the working environment;

[0004] According to the Chinese patent document with announcement number CN215101802U, the drag chain anti-swing mechanism and stacker are composed of a first drag chain guide groove, a second drag chain guide groove, a bracket and a protective plate on one side, which are fixed with bolts respectively, so that the drag chain is fully protected against swinging on the other three sides except the movable side, wherein the protective plate and the bracket not only play the role of fixing the guide groove section, but also can limit the freedom of the drag chain in one direction, so that the drag chain is prevented from swinging during movement.

[0005] Based on the search of the above patents and in combination with the equipment in the prior art, it is found that during the operation of the stacker, it is necessary to ensure that the bending radius of the drag chain meets the bending requirements of the cable and hose to avoid damage caused by excessive bending, or excessive bending causing the drag chain body to detach from the guide groove and generate friction with other parts of the stacker. When the above equipment is in use, one end of the drag chain body slides up and down under the traction of the stacker cargo platform. At this time, the angle of the bending part of the drag chain body cannot be guaranteed. In the prior art, a pulley is generally added to the drag chain body to control its bending angle. This can only expand the bending radius of the drag chain, but cannot avoid the shaking of the drag chain and the friction with other parts of the stacker.

[0006] Therefore, there is an urgent need to improve the drag chain mechanism of the vertical slide rail stacker to solve the above-mentioned problems. Summary of the invention

[0007] The object of the present invention is to provide a vertical slide rail stacker drag chain mechanism, wherein the slider and the slide rail can guide the sliding of the drag chain body, the load-bearing wheels can change the force direction of the drag chain body and limit the bending radius of the drag chain body at the same time, and the traction force of the stacker cargo platform and the gravity of the load-bearing wheels interact with each other to make one end of the drag chain body in a straight state during the sliding process, and the limit protection plate can prevent the bending radius of the drag chain body from being too large during the sliding of the stacker cargo platform, thereby limiting the bending radius of the drag chain body within a certain range, which reduces the risk of excessive bending and damage of cables and hoses on the one hand, and avoids friction between the drag chain body and other parts due to the excessive bending radius on the other hand.

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] A drag chain mechanism of a vertical slide rail stacker, comprising a slide rail, a slider is slidably arranged on the slide rail, a load-bearing wheel is rotatably arranged on one side of the slider, a drag chain body is rotatably connected to the bottom side of the load-bearing wheel, one end of the drag chain body bypasses the bottom side of the load-bearing wheel and extends above the load-bearing wheel, and the load-bearing wheel is used to prevent the drag chain body from shaking too much left and right;

[0010] The two ends of the drag chain body are fixedly connected with connecting mechanisms, and the connecting mechanisms are used for the drag chain body to connect the stacker column and the stacker cargo platform;

[0011] A plurality of evenly distributed limit protection plates are fixedly mounted on both sides of the drag chain body, and the limit protection plates are used to prevent the drag chain body from bending too much.

[0012] Preferably, a pin is fixedly installed on one side of the slider, the load-bearing wheel is rotatably set on the pin, and a load-bearing wheel clamp is fixedly installed on the pin at a position corresponding to the load-bearing wheel. The load-bearing wheel clamp is used to limit the two ends of the load-bearing wheel. During the up and down movement of one end of the drag chain body, the load-bearing wheel slides up and down accordingly through the slider and the pin.

[0013] Preferably, the connecting mechanism includes two hinged plates fixedly connected to the two ends of the drag chain body, the upper ends of the hinged plates are rotatably connected to a magnetic connecting head, and hinge shafts are fixedly provided at positions of the hinged plates corresponding to the magnetic connecting heads, and the hinged plates are rotatably connected to the magnetic connecting heads via the hinge shafts.

[0014] Preferably, the connecting mechanism does not contact the load-bearing wheel during the up and down sliding of the drag chain body, one end of the drag chain body is fixedly connected to the stacker column through the magnetic connecting head, and the other end of the drag chain body is fixedly connected to the side of the stacker cargo platform through the magnetic connecting head.

[0015] Preferably, a connecting piece is fixedly installed on one end of the stacker loading platform close to the connecting mechanism, and the stacker loading platform is fixedly connected to the side surface of the magnetic connecting head through the connecting piece.

[0016] Preferably, a plurality of evenly distributed mounting blocks are fixedly mounted on the stacker column by means of bolts, and an L-shaped fixing plate is fixedly connected to the mounting block.

[0017] Preferably, the L-shaped fixing plate is not in contact with the stacker loading platform, and the side of the limit protection plate away from the drag chain body is fixedly mounted on the L-shaped fixing plate.

[0018] Preferably, inclined wing plates are fixedly provided at the upper and lower ends of the limit protection plate, and during the up and down movement of one end of the drag chain body, the side surface thereof contacts the side of the limit protection plate away from the inclined wing plate.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. The slider and the slide rail of the present invention can guide the sliding of the drag chain body, the load-bearing wheel can change the force direction of the drag chain body, and at the same time limit the bending radius of the drag chain body. The traction force of the stacker loading platform and the gravity of the load-bearing wheel interact with each other to make one end of the drag chain body in a straight state during the sliding process. The limit protection plate can prevent the bending radius of the drag chain body from being too large during the sliding of the stacker loading platform, thereby limiting the bending radius of the drag chain body within a certain range, effectively reducing the risk of excessive bending and damage of cables and hoses, and also preventing the drag chain body from rubbing against other parts.

[0021] 2. In the present invention, when one end of the drag chain body moves up and down, the load-bearing wheel can slide up and down accordingly, thereby guiding the movement of the drag chain body and ensuring that the drag chain body moves along a predetermined trajectory, avoiding deviation, distortion, etc., and ensuring the normal operation of the drag chain body. The rotation setting of the load-bearing wheel can convert the sliding friction between the drag chain body and other components into rolling friction, greatly reducing the friction resistance, making the movement of the drag chain body smoother, reducing energy loss, and improving the efficiency of the system.

[0022] 3. The setting of the magnetic connector of the present invention makes the connection between the two ends of the drag chain body more convenient. When two sections of the drag chain body need to be connected, it is only necessary to move the magnetic connector close to the corresponding connection part. Due to the effect of magnetic force, they will quickly adsorb together to achieve quick connection, which can save installation time and improve work efficiency. The hinged plate and the magnetic connector are rotatably connected through the hinge shaft, so that the drag chain body can adapt to different angles and direction changes during movement. When the drag chain body bends and twists with the movement of the equipment, this rotating connection can ensure that the connection part will not be subjected to excessive stress, reducing the risk of damage to the drag chain body.

[0023] 4. The presence of the inclined wing plate of the present invention enables the drag chain body to slide toward the limit protection plate more smoothly when approaching the limit protection plate, thereby reducing jamming and friction. The side of the drag chain body in contact with the limit protection plate will generate friction during movement. The limit protection plate is usually made of wear-resistant material, which can reduce the wear of the drag chain body and extend the service life of the drag chain body. The inclined wing plate can disperse the pressure when the drag chain body contacts the limit protection plate, thereby reducing local wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 A front view schematic diagram provided for the present invention;

[0026] Figure 2 This is a structural elevation diagram of the drag chain body, slide rails and load-bearing wheels provided by the present invention;

[0027] Figure 3 A side view schematic diagram provided by the present invention;

[0028] Figure 4 The present invention provides Figure 3 The enlarged schematic diagram at A in the middle;

[0029] Figure 5 A schematic diagram of the working state of the drag chain provided by the present invention;

[0030] Figure 6 A schematic diagram of the exploded structure of the load-bearing wheel and the sliding block provided by the present invention;

[0031] Figure 7 An exploded schematic diagram of the connection mechanism provided by the present invention;

[0032] Figure 8 This is a structural elevation view of the limit protection plate provided by the present invention.

[0033] In the figure, 1. slide rail; 2. slider; 3. load-bearing wheel; 4. drag chain body; 5. connecting mechanism; 51. hinge plate; 52. magnetic connector; 53. hinge shaft; 6. limit protection plate; 61. inclined wing plate; 7. pin shaft; 8. load-bearing wheel clamp; 9. mounting block; 10. L-shaped fixing plate; 11. stacker column; 12. stacker loading platform; 13. connecting parts. DETAILED DESCRIPTION

[0034] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0035] like Figure 1-Figure 8 As shown, the vertical slide rail type stacker drag chain mechanism provided in this embodiment includes a slide rail 1, a slider 2 is slidably provided on the slide rail 1, a load-bearing wheel 3 is rotatably provided on one side of the slider 2, and a drag chain body 4 is rotatably connected to the bottom side of the load-bearing wheel 3, and one end of the drag chain body 4 bypasses the bottom side of the load-bearing wheel 3 and extends above the load-bearing wheel 3. The load-bearing wheel 3 is used to prevent the drag chain body 4 from shaking too much to the left and right. The slider 2 and the slide rail 1 can guide the sliding of the drag chain body 4, and the load-bearing wheel 3 can change the force direction of the drag chain body 4 and limit the bending radius of the drag chain body 4 at the same time;

[0036] The two ends of the drag chain body 4 are fixedly connected with connecting mechanisms 5, and the connecting mechanisms 5 are used to connect the drag chain body 4 to the stacker column 11 and the stacker cargo platform 12; a number of evenly distributed limit protection plates 6 are fixedly installed on both sides of the drag chain body 4, and the limit protection plates 6 are used to prevent the drag chain body 4 from bending too much. Under the interaction of the traction force of the stacker cargo platform 12 and the gravity of the load-bearing wheel 3, one end of the drag chain body 4 can be in a straight state during the sliding process. The limit protection plate 6 can prevent the bending radius of the drag chain body 4 from being too large during the sliding of the stacker cargo platform 12, thereby limiting the bending radius of the drag chain body 4 to a certain range, effectively reducing the risk of excessive bending and damage of cables and hoses, and also preventing the drag chain body 4 from rubbing against other parts, thereby greatly extending the service life of the drag chain body 4.

[0037] Further, such as Figure 1 and Figure 6 As shown, a pin shaft 7 is fixedly installed on one side of the slider 2, and the load-bearing wheel 3 is rotatably set on the pin shaft 7. A load-bearing wheel clamping plate 8 is fixedly installed at the position of the pin shaft 7 corresponding to the load-bearing wheel 3. The load-bearing wheel clamping plate 8 is used to limit the two ends of the load-bearing wheel 3. During the up and down movement of one end of the drag chain body 4, the load-bearing wheel 3 slides up and down through the slider 2 and the pin shaft 7, and the load-bearing wheel 3 is connected to the drag chain body 4 through the slider 2 and the pin shaft 7;

[0038] Among them, when one end of the drag chain body 4 moves up and down, the load-bearing wheel 3 can slide up and down accordingly, playing the role of guiding the movement of the drag chain body 4, ensuring that the drag chain body 4 moves along a predetermined trajectory, avoiding deviation, distortion, etc., and ensuring the normal operation of the drag chain body 4. The rotating setting of the load-bearing wheel 3 can convert the sliding friction between the drag chain body 4 and other components into rolling friction, greatly reducing the friction resistance, making the movement of the drag chain body 4 smoother, reducing energy loss, and improving the efficiency of the system.

[0039] Furthermore, Figure 3 and Figure 7 As shown, the connection mechanism 5 includes two hinged plates 51 fixedly connected to the two ends of the drag chain body 4, the upper end of the hinged plate 51 is rotatably connected to a magnetic connector 52, and a hinge shaft 53 is fixedly provided at the position corresponding to the hinged plate 51 and the magnetic connector 52, and the hinged plate 51 is rotatably connected to the magnetic connector 52 through the hinge shaft 53. The connection mechanism 5 does not contact the load-bearing wheel 3 during the up and down sliding process of the drag chain body 4, one end of the drag chain body 4 is fixedly connected to the stacker column 11 through the magnetic connector 52, and the other end of the drag chain body 4 is fixedly connected to the side of the stacker cargo platform 12 through the magnetic connector 52;

[0040] The arrangement of the magnetic connector 52 makes the connection between the two ends of the drag chain body 4 more convenient. When two sections of the drag chain body 4 need to be connected, the magnetic connector 52 only needs to be brought close to the corresponding connection part. Due to the effect of the magnetic force, they will be quickly adsorbed together to achieve a quick connection. This connection method greatly saves installation time and improves work efficiency. The hinge plate 51 and the magnetic connector 52 are rotatably connected through the hinge shaft 53, so that the drag chain body 4 can adapt to different angles and direction changes during movement. When the drag chain body 4 bends and twists with the movement of the equipment, this rotation connection can ensure that the connection part will not be subjected to excessive stress, reducing the risk of damage to the drag chain body 4.

[0041] Specifically, the hinge shaft 53 can withstand a certain tension, pressure and torque to ensure that the connection part of the drag chain body 4 will not be loose or deformed during the movement. When a part of the drag chain body 4 is damaged, the part can be quickly separated by the magnetic connector for local repair or replacement without replacing the entire drag chain, which can reduce maintenance costs and improve equipment availability.

[0042] At the same time, if Figure 3 , Figure 4 and Figure 7 As shown, a connector 13 is fixedly installed at one end of the stacker loading platform 12 close to the connecting mechanism 5, and the stacker loading platform 12 is fixedly connected to the side of the magnetic connecting head 52 through the connector 13. The stacker loading platform 12 is fixedly connected to the side of the magnetic connecting head 52 through the connector 13, providing a stable connection point for the drag chain body 4. During the operation of the stacker, the movement of the stacker loading platform 12 can be reliably transmitted to the drag chain body 4, ensuring that the drag chain body 4 moves synchronously with the movement of the stacker loading platform 12, avoiding the situation where the drag chain is separated from the loading platform;

[0043] This fixed connection method can withstand a certain amount of tension, pressure and vibration, ensuring the reliability of the connection under various working conditions. In conjunction with the hinged plate 51, the drag chain body 4 can better adapt to the movement trajectory and working space of the stacker, thereby improving the working flexibility and adaptability of the stacker.

[0044] Further, if Figure 3 and Figure 8 As shown, a plurality of evenly distributed mounting blocks 9 are fixedly mounted on the stacker column 11 by bolts, an L-shaped fixing plate 10 is fixedly connected to the mounting block 9, the L-shaped fixing plate 10 does not contact the stacker loading platform, and the side of the limit protection plate 6 away from the drag chain body 4 is fixedly mounted on the L-shaped fixing plate 10;

[0045] Among them, the L-shaped fixing plate 10 fixedly connected to the mounting block 9 provides a stable support for the limit protection plate 6. The design of the L-shaped fixing plate 10 can increase the contact area with the mounting block 9, improve the strength and stability of the connection, and at the same time, the L-shaped shape is also helpful to disperse the force and reduce the local stress concentration. The limit protection plate 6 is fixed on the L-shaped fixing plate 10, adjacent to the drag chain body but not in contact with it. During the movement of the drag chain body 4, the limit protection plate 6 can limit the swing range of the drag chain body 4 to prevent the drag chain body 4 from excessively shaking and deviating from the predetermined motion trajectory;

[0046] This helps to protect the drag chain body 4 from collision and interference with external objects, and also avoids interference between the drag chain body 4 and other components of the stacker, providing a stable installation foundation and effective limit protection function for the drag chain body 4, while also facilitating installation and adjustment, thereby improving the operating safety and reliability of the stacker.

[0047] In addition, if Figure 8 As shown, the upper and lower ends of the limit protection plate 6 are fixedly provided with inclined wing plates 61. When one end of the drag chain body 4 moves up and down, its side surface contacts the side of the limit protection plate 6 away from the inclined wing plate 61. When one end of the drag chain body moves up and down, the side surface contacts the side of the limit protection plate away from the inclined wing plate. The limit protection plate 6 plays a role in guiding the movement of the drag chain body 4, ensuring that the drag chain body 4 moves on a specified path to avoid deviation or distortion.

[0048] The presence of the inclined wing plate 61 allows the drag chain body 4 to slide toward the limit protection plate 6 more smoothly when approaching the limit protection plate 6, reducing jamming and friction. The side of the drag chain body 4 that contacts the limit protection plate 6 will produce friction during movement. The limit protection plate 6 is usually made of wear-resistant material, which can reduce the wear of the drag chain body 4 and extend the service life of the drag chain body 4; the inclined wing plate 61 can disperse the pressure when the drag chain body 4 contacts the limit protection plate 6, reducing local wear.

[0049] like Figure 1-Figure 8 As shown, the principle of the drag chain mechanism of the vertical slide rail stacker provided in this embodiment is as follows:

[0050] When the stacker cargo platform 12 slides upward, the traction force of the stacker cargo platform 12 interacts with the gravity of the load-bearing wheel 3 to make the drag chain body 4 in a stretched state. When one end of the drag chain body 4 moves upward following the traction force of the stacker cargo platform 12, the pin shaft 7 can make the load-bearing wheel 3 slide upward accordingly. At the same time, the slider 2 and the slide rail 1 guide the drag chain body 4. When the stacker cargo platform 12 slides downward, one end of the drag chain body 4 slides downward, and the load-bearing wheel 3 slides downward through the slider 2 under the action of its own gravity. The limit protection plate 6 can limit the swing range of the drag chain body 4 to prevent the drag chain body 4 from excessive shaking and deviating from the predetermined motion trajectory.

[0051] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0052] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0053] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A vertical slide rail type stacker drag chain mechanism, comprising a slide rail (1), characterized in that: A slider (2) is slidably arranged on the slide rail (1), a load-bearing wheel (3) is rotatably arranged on one side of the slider (2), a drag chain body (4) is rotatably connected to the bottom side of the load-bearing wheel (3), one end of the drag chain body (4) bypasses the bottom side of the load-bearing wheel (3) and extends to the top of the load-bearing wheel (3), and the load-bearing wheel (3) is used to prevent the drag chain body (4) from shaking too much to the left and right; The two ends of the drag chain body (4) are fixedly connected with connecting mechanisms (5), and the connecting mechanisms (5) are used for connecting the drag chain body (4) to the stacker column (11) and the stacker cargo platform (12); A plurality of evenly distributed limit protection plates (6) are fixedly mounted on both sides of the drag chain body (4), and the limit protection plates (6) are used to prevent the drag chain body (4) from bending too much.

2. A drag chain mechanism for a vertical slide rail stacker according to claim 1, characterized in that: A pin shaft (7) is fixedly mounted on one side of the slider (2), the load-bearing wheel (3) is rotatably mounted on the pin shaft (7), a load-bearing wheel clamp (8) is fixedly mounted on the pin shaft (7) at a position corresponding to the load-bearing wheel (3), the load-bearing wheel clamp (8) is used to limit the two ends of the load-bearing wheel (3), and during the up and down movement of one end of the drag chain body (4), the load-bearing wheel (3) slides up and down along with it via the slider (2) and the pin shaft (7).

3. The drag chain mechanism of a vertical slide rail stacker according to claim 1, characterized in that: The connection mechanism (5) comprises two hinged plates (51) fixedly connected to the two ends of the drag chain body (4), and the upper ends of the hinged plates (51) are rotatably connected to magnetic connectors (52).

4. A drag chain mechanism for a vertical slide rail stacker according to claim 3, characterized in that: A hinge shaft (53) is fixedly arranged at a position of the hinge plate (51) corresponding to the magnetic connection head (52), and the hinge plate (51) is rotatably connected to the magnetic connection head (52) via the hinge shaft (53).

5. The drag chain mechanism of a vertical slide rail stacker according to claim 3, characterized in that: During the up and down sliding of the drag chain body (4), the connecting mechanism (5) does not contact the load-bearing wheel (3).

6. A drag chain mechanism for a vertical slide rail stacker according to claim 3, characterized in that: One end of the drag chain body (4) is fixedly connected to the stacker column (11) via the magnetic connector (52), and the other end of the drag chain body (4) is fixedly connected to the side of the stacker cargo platform (12) via the magnetic connector (52).

7. A drag chain mechanism for a vertical slide rail stacker according to claim 3, characterized in that: A connecting piece (13) is fixedly installed at one end of the stacker loading platform (12) close to the connecting mechanism (5), and the stacker loading platform (12) is fixedly connected to the side of the magnetic connecting head (52) via the connecting piece (13).

8. The drag chain mechanism of a vertical slide rail stacker according to claim 1, characterized in that: A plurality of evenly distributed mounting blocks (9) are fixedly mounted on the stacker column (11) by means of bolts, and an L-shaped fixing plate (10) is fixedly connected to the mounting block (9).

9. A drag chain mechanism for a vertical slide rail stacker according to claim 8, characterized in that: The L-shaped fixing plate (10) is not in contact with the stacker cargo platform, and the side of the position limiting protection plate (6) away from the drag chain body (4) is fixedly mounted on the L-shaped fixing plate (10).

10. The drag chain mechanism of a vertical slide rail stacker according to claim 1, characterized in that: The upper and lower ends of the position limiting protection plate (6) are fixedly provided with inclined wing plates (61), and during the process of the up and down movement of one end of the drag chain body (4), its side surface contacts the side of the position limiting protection plate (6) away from the inclined wing plate (61).

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