Chain, rigid push-pull chain and chain transmission system

Abstract

The invention relates to the technical field of chain transmission, in particular to a chain, a rigid push-pull chain and a chain transmission system. The chain comprises a plurality of outer chain links and a plurality of inner chain links which are sequentially connected in a staggered mode in the preset direction. At least one outer chain plate in the multiple outer chain links is provided with a first meshing part, and at least one inner chain plate in the multiple inner chain links is provided with a second meshing part; wherein the first meshing part is used for being meshed with a first meshing part of an external chain, and the second meshing part is used for being meshed with a second meshing part of the external chain. The chain is applied to a rigid push-pull chain of a chain transmission system, the firmness of mutual meshing between the chain plates is improved through mutual meshing of the two chains, dislocation or other irregular movement of the chains during meshing operation is prevented, and therefore the overall straight stability of the chain can be enhanced, and the service life of the chain is prolonged. Bending or inclination caused by load or impact is avoided, the stability of the chain in frequent push-pull operation is effectively enhanced, and reliable operation of a system is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of chain transmission, and in particular to a chain, a rigid push-pull chain and a chain transmission system. Background Art

[0002] Rigid push-pull chains are generally used in pairs. During operation, due to the loose meshing relationship between the chain plates, misalignment is prone to occur. This misalignment will cause the coordination between the chain links to become unstable, resulting in the chain itself being twisted, deformed or tilted. Moreover, if the misalignment problem worsens further, the chain may break due to excessive tension, posing a serious safety hazard to the normal operation of the equipment. Summary of the invention

[0003] The purpose of the present invention includes providing a chain, a rigid push-pull chain and a chain transmission system, wherein the chain is applied to the rigid push-pull chain of the chain transmission system, and the mutual engagement of the two chains is improved to enhance the firmness of the mutual engagement between the chain plates, thereby preventing the chain from being dislocated or other irregularly moving during meshing operation, thereby enhancing the overall straightness and stability of the chain, preventing it from bending or tilting due to load or impact, effectively enhancing the stability of the chain in frequent push-pull operations, and ensuring the reliable operation of the system.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a chain, comprising a plurality of outer links and a plurality of inner links connected in a staggered order in a preset direction; at least one outer link plate of the plurality of outer links is provided with a first meshing portion, and at least one inner link plate of the plurality of inner links is provided with a second meshing portion;

[0006] The first meshing portion is used to mesh with the first meshing portion of the external chain, and the second meshing portion is used to mesh with the second meshing portion of the external chain.

[0007] In an optional embodiment, the outer link plate of each outer link is configured with a first meshing portion, and the inner link plate of each inner link is configured with a second meshing portion.

[0008] In an optional embodiment, the first meshing portion includes a first protrusion and a first groove respectively arranged on both sides of the outer link plate of the outer link; the second meshing portion includes a second protrusion and a second groove respectively arranged on both sides of the inner link plate of the inner link;

[0009] The protruding directions of the first protrusion and the second protrusion are opposite, and the recessed directions of the first groove and the second groove are opposite.

[0010] In an optional embodiment, the first protrusion has a contour adapted to the first groove, the second protrusion has a contour adapted to the second groove, and the first protrusion and the second protrusion are both semicircular, and the first groove and the second groove are both semicircular.

[0011] In an optional embodiment, two first matching planes are configured on both sides of the outer link plate, and the two first matching planes are located on both sides of the first protrusion or the first groove on the same side;

[0012] Two second matching planes are arranged on both sides of the inner link plate, and the two second matching planes are located on both sides of the second protrusion or the second groove on the same side;

[0013] Wherein, a first arc-shaped transition surface is configured at the connection between the first matching plane and the first protrusion or the first groove, and a second arc-shaped transition surface is configured at the connection between the second matching plane and the second protrusion or the second groove.

[0014] In an optional embodiment, the distance from the center of the first protrusion to the bottom edge of the outer link plate and the distance from the center of the second protrusion to the inner link plate are both the first distance, the distance from the top edge of the outer link plate and the inner link plate to their bottom edge is the second distance, and the first distance is 3 / 5-4 / 5 of the second distance.

[0015] In an optional embodiment, the spacing between the two side edges of the outer link plate and the inner link plate is a first spacing; the spacing between the two shaft holes of the outer link plate and the inner link plate is a second spacing; and the first spacing is greater than the second spacing.

[0016] In a second aspect, the present invention provides a rigid push-pull chain, the rigid push-pull chain comprising two of the above-mentioned chains;

[0017] The rigid push-pull chain includes two rigid segments where the chains are engaged and two flexible segments where the chains are disengaged, the rigid segments extending in a preset direction;

[0018] The outer link plates of the two chains at the rigid section mesh with each other, and the inner link plates mesh with each other.

[0019] In an optional embodiment, the flexible section extends in an arc shape, and a diameter thereof is 3-6 times the length of the top edge of the outer link plate or the inner link plate.

[0020] In a third aspect, the present invention provides a chain transmission system, the chain transmission system comprising at least one sprocket, a transmission connecting block and the above-mentioned rigid push-pull chain;

[0021] The sprocket is meshed with one of the chains, and the transmission connecting block is connected with the rigid segment;

[0022] The sprocket is used to drive the rigid push-pull chain to move, thereby driving the transmission connecting block to move along a preset direction.

[0023] The beneficial effects of the chain, rigid push-pull chain and chain transmission system provided by the embodiments of the present invention include:

[0024] The chain includes a plurality of outer links and a plurality of inner links connected in a staggered order in a preset direction; at least one outer link plate of the plurality of outer links is provided with a first meshing portion, and at least one inner link plate of the plurality of inner links is provided with a second meshing portion; wherein the first meshing portion is used to mesh with the first meshing portion of the outer chain, and the second meshing portion is used to mesh with the second meshing portion of the outer chain. The chain is applied to a rigid push-pull chain of a chain transmission system, and is used in pairs, that is, the mutual meshing of the two chains is used to enhance the firmness of the mutual meshing between the chain plates, so that a two-sided constraint limiting structure can be formed on both sides of the chain plates to prevent the chain from being dislocated or otherwise moving irregularly during meshing operation, thereby enhancing the overall straightness stability of the chain, ensuring that it always maintains a straight state during meshing operation, and will not bend or tilt due to load or impact, effectively enhancing the stability of the chain in frequent push-pull operations, and ensuring the reliable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of the rigid push-pull chain provided in this embodiment from a first viewing angle;

[0027] Figure 2 A schematic diagram of the structure of the rigid push-pull chain provided in this embodiment from a second viewing angle;

[0028] Figure 3 for Figure 2 The local schematic diagram of the A in the middle;

[0029] Figure 4 A schematic diagram of the structure of the chain provided in this embodiment;

[0030] Figure 5 An exploded schematic diagram of the chain provided in this embodiment;

[0031] Figure 6 A schematic diagram of the structure of two chains provided for this embodiment;

[0032] Figure 7 A schematic diagram of the structure of the outer link provided in this embodiment;

[0033] Figure 8A schematic diagram of the structure of the inner chain link provided in this embodiment;

[0034] Fig. 9 A schematic diagram of the structure of the outer link plate provided in this embodiment;

[0035] Fig.10 This is a schematic diagram of the structure of the chain transmission system provided in this embodiment.

[0036] Icon: 100-chain; 110-outer link; 120-inner link; 111-outer link plate; 112-first meshing portion; 121-inner link plate; 122-second meshing portion; 113-first protrusion; 114-first groove; 123-second protrusion; 124-second groove; 1101-first outer link; 1201-first inner link; 1102-second outer link; 1202-second inner link; 1121-first meshing portion A; 1131-first protrusion A; 1141-first groove A; 1221-second meshing portion A; 1 231-second protrusion A; 1241-second groove A; 1122-first meshing portion B; 1132-first protrusion B; 1142-first groove B; 1222-second meshing portion B; 1232-second protrusion B; 1242-second groove B; 115-first mating plane; 125-second mating plane; 116-first arc-shaped transition surface; 126-second arc-shaped transition surface; 200-rigid push-pull chain; 210-rigid section; 220-flexible section; 300-chain transmission system; 310-sprocket; 320-transmission connecting block. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0042] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0043] Please refer to Figure 1-Figure 8 , this embodiment provides a rigid push-pull chain 200, the rigid push-pull chain 200 includes two chains 100;

[0044] Each chain 100 includes a plurality of chains along a predetermined direction (such as Figure 1 A plurality of outer chain links 110 and a plurality of inner chain links 120 are connected in a staggered order (in the direction indicated by the middle arrow D); at least one outer link plate 111 of the plurality of outer chain links 110 is provided with a first meshing portion 112, and at least one inner link plate 121 of the plurality of inner chain links 120 is provided with a second meshing portion 122; wherein the first meshing portion 112 is used to mesh with the first meshing portion 112 of the outer chain 100, and the second meshing portion 122 is used to mesh with the second meshing portion 122 of the outer chain 100;

[0045] By using the above-mentioned two chains 100 in combination, that is, by meshing the first meshing portion 112 of the outer link plate 111 of one of the chains 100 with the first meshing portion 112 of the outer link plate 111 of the other chain 100, and meshing the second meshing portion 122 of the inner link plate 121 of one of the chains 100 with the second meshing portion 122 of the inner link plate 121 of the other chain 100, the two chains 100 can be meshed with each other, so that transmission can be performed, and such a setting makes the rigid push-pull chain 200 include a rigid section 210 where the two chains 100 are meshed and a flexible section 220 where the two chains 100 are disengaged, and the rigid section 210 extends along a preset direction; wherein, the outer link plates 111 of the two chains 100 at the rigid section 210 are meshed with each other and the inner link plates 121 are meshed with each other.

[0046] Please refer to Figure 1-Figure 8 The working principle of the rigid push-pull chain 200 is:

[0047] The rigid push-pull chain 200 adopts a method of using two chains 100 in pairs. The two chains 100 have the same structure and are staggered when used in pairs, that is, by meshing the first meshing portion 112 of the outer link plate 111 of one of the chains 100 with the first meshing portion 112 of the outer link plate 111 of the other chain 100, and meshing the second meshing portion 122 of the inner link plate 121 of one of the chains 100 with the second meshing portion 122 of the inner link plate 121 of the other chain 100, the two chains 100 can be meshed with each other. In this way, the two mutually matched chains 100 are segmented into rigid segments 210, and the disengaged portions form flexible segments 220.

[0048] Through the above-mentioned structural setting, the rigid section 210 of the rigid push-pull chain can improve the firmness of the mutual engagement between the chain plates through the mutual engagement of the two chains 100, so that a two-sided constraint restriction structure can be formed on both sides of the chain plates to prevent the chain 100 from being misaligned or other irregular movements during the meshing operation. As a result, the overall straightness and stability of the chain 100 can be enhanced to ensure that it always remains in a straight line during the meshing operation and will not bend or tilt due to load or impact, thereby effectively enhancing the stability of the chain 100 in frequent push-pull operations and ensuring the reliable operation of the system.

[0049] It should be noted that, in this embodiment, when configuring the above-mentioned chain 100, each chain 100 includes an outer link 110 and an inner link, wherein the structural connection form of the outer link 110 and the inner link 120 is the same as that of the prior art, so it is not repeated here. In addition, this embodiment adopts a method in which a first meshing portion 112 is correspondingly provided on the outer link plate 111 of each outer link 110, and a second meshing portion 122 is correspondingly provided on the inner link plate 121 of each inner link 120; and in its embodiment of the present invention, on the basis of being able to achieve the above-mentioned technical effects, the number of the first meshing portion 112 and the second meshing portion 122 can also be adjusted according to actual usage requirements, that is, it can be Along the preset direction, multiple first meshing portions 112 or multiple second meshing portions 122 are distributed at intervals. For example, one of two adjacent outer links 110 can be configured with a first meshing portion 112, and one of two adjacent inner links 120 can be configured with a second meshing portion 122; and when configuring the outer link plate 111 and the inner link plate 121, taking laying them flat as an example, the two side surfaces spaced along the preset direction are their side plates, and the side facing the other chain 100 is its top edge, and the side opposite to the top edge is the bottom edge; in addition, it should be noted that, in the present embodiment, the preset direction refers to the extension direction of multiple links of the chain 100 when laid flat, and also refers to the extension direction of the rigid segment 210.

[0050] For further information, please refer to Figure 1-Figure 8 In the present embodiment, it can be known from the foregoing content that in the process of pairing the two chains 100, the first meshing portions 112 and the second meshing portions 122 on the two chains 100 are meshed, and in the process of use, the rigid push-pull chain 200 realizes a reciprocating push-pull motion, therefore, it includes a rigid section 210 and a flexible section 220, wherein the two chains 100 of the flexible section 220 are disengaged, based on this, in order to enable the two chains 100 at the critical point between the flexible section 220 and the rigid section 210, so that the chain 100 of the flexible section 220 can mesh to form a part of the rigid section 210, therefore, in the present embodiment, the flexible section 220 is extended in an arc shape, and its diameter is 3-6 times the length of the top edge of the outer link plate 111 or the inner link plate 121.

[0051] As can be seen from the above, in this embodiment, the outer link plate 111 of each outer link 110 is configured with a first meshing portion 112 , and the inner link plate 121 of each inner link 120 is configured with a second meshing portion 122 .

[0052] Moreover, on the basis of the above contents, when configuring the first meshing portion 112 and the second meshing portion 122, the first meshing portion 112 includes the first protrusion 113 and the first groove 114 respectively configured on both sides of the outer link plate 111 of the outer link 110, that is, the first meshing portion 112 includes the first protrusion 113 and the first groove 114 configured on both sides of the outer link plate 111, and combined with the above contents, it can be known that the structures of the two chains 100 used in pair are consistent, so when the two chains 100 are mated and meshed, the first protrusion 113 can be matched with the first groove 114 on the other chain 100;

[0053] Similarly, when configuring the second meshing portion 122, the second meshing portion 122 includes a second protrusion 123 and a second groove 124 respectively configured on both sides of the inner link plate 121 of the inner link 120; and in combination with the above content, it can be known that the structures of the two chains 100 used in pair are consistent, so when the two chains 100 are mated and meshed, the second protrusion 123 can be matched with the second groove 124 on the other chain 100;

[0054] In addition, based on the above-mentioned structural setting, in order to improve its stability in use and avoid bending or tilting after engagement, the protruding directions of the first protrusion 113 and the second protrusion 123 in this embodiment are opposite, and the recessed directions of the first groove 114 and the second groove 124 are opposite. The purpose of such a setting is to ensure that after the two chains 100 are meshed, the coupling direction between the first meshing portions 112 on the outer link plates 111 is opposite to the coupling direction between the second meshing portions 122 on the inner link plates 121, that is, the outer link plates 111 and the inner link plates 121 on the two chains 100 are assembled in reverse, thereby forming a two-way double-sided meshing, thereby improving the stability during the meshing process, and such a two-way double-sided meshing form forms a two-sided double-constrained arc-shaped limiting structure, which can effectively prevent the chain 100 from being dislocated or other irregular movements during meshing operation; in addition, after the two chain plates are meshed to form the rigid section 210, and the rigid section 210 extends in a straight line, based on the structure of the first meshing portion 112 and the second meshing portion 122 mentioned above, the straightness stability of the rigid section 210 can be improved, ensuring that it always remains in a straight state during the meshing operation and will not bend or tilt due to load or impact. Therefore, through the above-mentioned structural setting, the firmness of the mutual engagement between the chain plates can be significantly improved, thereby effectively enhancing the stability of the chain 100 in frequent push-pull operations and ensuring the reliable operation of the chain 100 system.

[0055] In summary, based on the above content, when two chains 100 are paired, an outer link 110 and an inner link 120 of one chain 100 are meshed with an outer link 110 and an inner link 120 of another chain 100, for example. Figure 6 As shown, an outer link 110 and an inner link 120 of one of the chains 100 are defined as a first outer link 1101 and a first inner link 1201, and an outer link 110 and an inner link 120 of the other chain 100 are defined as a second outer link 1102 and a second inner link 1202;

[0056] Based on this, the first outer link 1101 is correspondingly provided with a first meshing portion A1121, and the first meshing portion A1121 includes a first protrusion A1131 and a first groove A1141, and the first inner link 1201 is correspondingly provided with a second meshing portion A1221, and the second meshing portion A1221 includes a second protrusion A1231 and a second groove A1241. Similarly, the second outer link 1102 is correspondingly provided with a first meshing portion B1122, and the first meshing portion B1122 includes a first protrusion B1132 and a first groove B1142, and the second inner link 1202 is correspondingly provided with a second meshing portion B1222, and the second meshing portion B1222 includes a second protrusion B1232 and a second groove B1242;

[0057] Therefore, when the first outer link 1101 is meshed with the second outer link 1102, the first protrusion A1131 of the first meshing portion A1121 cooperates with the first groove B1142 of the first meshing portion B1122, and the first groove A1141 of the first meshing portion A1121 cooperates with the first protrusion B1132 of the first meshing portion B1122;

[0058] When the first inner link 1201 is meshed with the second inner link 1202, the second protrusion A1231 of the second meshing portion A1221 cooperates with the second groove B1242 of the second meshing portion B1222, and the second groove A1241 of the second meshing portion A1221 cooperates with the second protrusion B1232 of the second meshing portion B1222.

[0059] Furthermore, on the basis of the above structure, in order to improve the engagement stability between the first protrusion 113 and the first groove 114 and between the second protrusion 123 and the second groove 124, the present embodiment adopts a method in which the first protrusion 113 is adapted to the first groove 114 and the second protrusion 123 is adapted to the second groove 124. Specifically, the first protrusion 113 has a contour adapted to the first groove 114, and the second protrusion 123 has a contour adapted to the second groove 124, thereby improving the stability after matching. For example, when configuring the first protrusion 113, the first protrusion 113 and the second protrusion 123 can be set to be semicircular, the first groove 114 and the second groove 124 can be set to be semicircular, and the circular radius of the first protrusion 113 is the same as the circular radius of the first groove 114, and the circular radius of the second protrusion 123 is the same as the circular radius of the second groove 124.

[0060] On the basis of configuring the above-mentioned first meshing portion 112 and the second meshing portion 122, on the basis of configuring the first protrusion 113 and the first groove 114 on both sides of the outer link plate 111, two first matching planes 115 can also be configured on both sides of the outer link plate 111, and the two first matching planes 115 are located on both sides of the first protrusion 113 or the first groove 114 on the same side; and a first arc-shaped transition surface 116 is configured at the connection between the first matching plane 115 and the first protrusion 113 or the first groove 114;

[0061] Two second matching planes 125 are disposed on both sides of the inner link plate 121. The two second matching planes 125 are located on both sides of the second protrusion 123 or the second groove 124 on the same side. A second arc-shaped transition surface 126 is disposed at the connection between the second matching plane 125 and the second protrusion 123 or the second groove 124.

[0062] Through such a setting, the partial links of the two chains 100 forming the flexible section 220 can be smoothly meshed and become part of the rigid section 210. Similarly, the two chains 100 can be smoothly disengaged, thereby improving the running smoothness and stability of the rigid push-pull chain 200.

[0063] And when configuring the above structure, such as Fig. 9 As shown, the distance from the center of the first protrusion 113 to the bottom edge of the outer link plate 111 and the distance from the center of the second protrusion 123 to the inner link plate 121 can also be the first distance L1, the distance from the top edge of the outer link plate 111 and the inner link plate 121 to their bottom edges is the second distance L2, and the first distance is 3 / 5-4 / 5 of the second distance. In addition, the spacing between the two side edges of the outer link plate 111 and the inner link plate 121 is the first spacing L3; the spacing between the two shaft holes of the outer link plate 111 and the inner link plate 121 is the second spacing L4; the first spacing is greater than the second spacing. For example, the first spacing can be 0.05 mm larger than the second spacing. Through such a setting, the purpose is to improve the smoothness of the two chains 100 during the process of engagement or disengagement.

[0064] Based on the above, please refer to Fig.10 , and combined with Figure 1-Figure 9 The present invention provides a chain transmission system 300, the chain transmission system 300 includes at least one sprocket 310, a transmission connection block 320 and the above-mentioned rigid push-pull chain 200;

[0065] The sprocket 310 is meshed with one of the chains 100, and the transmission connection block 320 is connected to the rigid section 210; wherein the sprocket 310 is used to drive the rigid push-pull chain 200 to move, thereby driving the transmission connection block 320 to move along a preset direction.

[0066] The chain transmission system 300 uses the rigid push-pull chain 200 described above, and can drive the two chains 100 to move through the sprocket 310, thereby partially engaging or disengaging the two chains, and in this process, driving the rigid section 210 to move, thereby moving with the external driven structure through the transmission connection block 320 connected to the rigid section 210;

[0067] Therefore, the chain transmission system 300 adopts the above-mentioned rigid push-pull chain to prevent the chain 100 from being dislocated or making other irregular movements during meshing operation, thereby enhancing the overall straightness stability of the chain 100, ensuring that it always remains in a straight line during the meshing operation, and will not bend or tilt due to load or impact, thereby effectively enhancing the stability of the chain 100 during frequent push-pull operations and ensuring the reliable operation of the system.

[0068] It should be noted that, in this embodiment, when configuring the sprocket 310, this embodiment adopts a method in which the sprocket 310 is meshed with the rigid section 210, and when connecting the transmission connection block 320, this embodiment adopts a method in which the transmission connection block 320 is configured at the end of the rigid section 210, that is, the transmission connection block 320 is located at the end of the rigid section 210 away from the flexible section 220. In addition, in other embodiments of the present invention, the sprocket 310 may also be meshed with the flexible section 220, or may be meshed with the boundary between the flexible section 220 and the rigid section 210; and the transmission connection block 320 may also be connected to other positions of the rigid section 210.

[0069] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A chain, characterized in that: The chain comprises a plurality of outer links and a plurality of inner links connected in a staggered order in a preset direction; at least one outer link plate of the plurality of outer links is provided with a first meshing portion, and at least one inner link plate of the plurality of inner links is provided with a second meshing portion; The first meshing portion is used to mesh with the first meshing portion of the external chain, and the second meshing portion is used to mesh with the second meshing portion of the external chain.

2. The chain according to claim 1, characterized in that: The outer link plate of each of the outer links is configured with a first meshing portion, and the inner link plate of each of the inner links is configured with the second meshing portion.

3. The chain according to claim 1, characterized in that: The first meshing portion includes a first protrusion and a first groove respectively arranged on both sides of the outer link plate of the outer link; the second meshing portion includes a second protrusion and a second groove respectively arranged on both sides of the inner link plate of the inner link; The protruding directions of the first protrusion and the second protrusion are opposite, and the recessed directions of the first groove and the second groove are opposite.

4. The chain according to claim 3, characterized in that: The first protrusion has a contour adapted to the first groove, the second protrusion has a contour adapted to the second groove, and the first protrusion and the second protrusion are both semicircular, and the first groove and the second groove are both semicircular.

5. The chain according to claim 3, characterized in that: Two first matching planes are configured on both sides of the outer link plate, and the two first matching planes are located on both sides of the first protrusion or the first groove on the same side; Two second matching planes are configured on both sides of the inner link plate, and the two second matching planes are located on both sides of the second protrusion or the second groove on the same side; Wherein, a first arc-shaped transition surface is configured at a connection between the first matching plane and the first protrusion or the first groove, and a second arc-shaped transition surface is configured at a connection between the second matching plane and the second protrusion or the second groove.

6. The chain according to claim 3, characterized in that: The distance from the center of the first protrusion to the bottom edge of the outer link plate and the distance from the center of the second protrusion to the inner link plate are both the first distance, the distance from the top edge of the outer link plate and the inner link plate to their bottom edge is the second distance, and the first distance is 3 / 5-4 / 5 of the second distance.

7. The chain according to any one of claims 1 to 6, characterized in that: The spacing between the two side edges of the outer link plate and the inner link plate is a first spacing; the spacing between the two shaft holes of the outer link plate and the inner link plate is a second spacing; and the first spacing is greater than the second spacing.

8. A rigid push-pull chain, characterized in that: The rigid push-pull chain comprises two chains as described in any one of claims 1 to 7; The rigid push-pull chain comprises two rigid segments engaged by the chain and two flexible segments disengaged by the chain, wherein the rigid segments extend along a preset direction; Wherein, the outer link plates of the two chains at the rigid section are meshed with each other and the inner link plates are meshed with each other.

9. The rigid push-pull chain according to claim 8, characterized in that: The flexible section extends in an arc shape, and its diameter is 3-6 times the length of the top edge of the outer link plate or the inner link plate.

10. A chain transmission system, characterized in that: The chain drive system comprises at least one sprocket, a drive connecting block and a rigid push-pull chain as claimed in claim 8 or 9; The sprocket is engaged with one of the chains, and the transmission connecting block is connected with the rigid section; Wherein, the sprocket is used to drive the rigid push-pull chain to move, thereby driving the transmission connecting block to move along the preset direction.

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