Positioning tool and oil cylinder assembly production line

Abstract

The invention relates to the technical field of hydraulic equipment, and discloses a positioning tool and an oil cylinder assembly production line. The supporting assembly is arranged on the bearing surface and is provided with a supporting structure; the fixing assembly is arranged on the bearing surface and is provided with a fixing structure; the positioning assembly is arranged on the bearing face and provided with a movable positioning structure, and a limiting structure is arranged on the positioning structure. The cylinder body is supported through the supporting assembly, meanwhile, the position of the cylinder body on the bearing table is preliminarily limited, the fixing assembly is connected with the cylinder body, and therefore movement of the cylinder body in the axial direction and rotation of the cylinder body in the circumferential direction are limited; after the positioning structure of the positioning assembly moves to the designated position of the cylinder body to abut against the cylinder body and the oil pipe is connected with the limiting structure, precise positioning of the relative positions of the cylinder body and the oil pipe is achieved at the moment, the butt joint precision of connectors of the cylinder body and the oil pipe is greatly improved when the cylinder body and the oil pipe are connected, the leakage risk is reduced, and meanwhile the reliability of a hydraulic system after the oil pipe is assembled is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, specifically to positioning fixtures and cylinder assembly production lines. Background Technology

[0002] In the hydraulic systems of construction machinery such as excavators, cranes, and concrete pump trucks, the assembly quality of the hydraulic pipes directly affects the performance of the hydraulic system, and consequently, the overall product quality of the main equipment. To ensure the assembly quality and consistency of the cylinders, the hydraulic pipes must be assembled into their designated positions in a predetermined posture during assembly.

[0003] Currently, the assembly of oil pipes on hydraulic cylinders is mainly done manually. Operators need to use measuring tools to determine the position of the oil pipes before manually installing them. In this assembly method, it is difficult to ensure the relative position of the hydraulic cylinder and the oil pipes. During installation, the oil pipes are prone to bending, twisting and deformation, which affects the oil circuit opening and closing and the system pressure transmission. At the same time, the oil pipes are prone to displacement during the assembly process, which will lead to low interface docking accuracy and increase the risk of leakage during later operation. Therefore, the existing oil pipe assembly method has the problem of poor reliability. Summary of the Invention

[0004] In view of this, the present invention provides a positioning fixture and hydraulic cylinder assembly line to solve the problem of poor reliability of existing hydraulic pipe assembly methods.

[0005] In a first aspect, the present invention provides a positioning fixture for assembling a hydraulic cylinder, the hydraulic cylinder including a cylinder body and an oil pipe, comprising: a support platform having a support surface; a support assembly arranged along a first direction on the support surface and having a support structure for engaging with the outer wall of the cylinder body; a fixing assembly disposed on the support surface, the fixing assembly having a fixing structure for detachably connecting with the cylinder body; and a positioning assembly disposed on the support surface and located on one side of the support assembly in a second direction, the positioning assembly having a movable positioning structure for abutting against the outer wall of the cylinder body, the positioning structure having a limiting structure for fixing the oil pipe.

[0006] Beneficial effects: While supporting the cylinder body with the support component, the position of the cylinder body on the support platform is initially restricted. The cylinder body is then restricted along the axial direction and rotated in the circumferential direction by connecting the fixing component to the cylinder body. After the cylinder body is fixed in the preset posture, the outer wall of the cylinder body is used as the positioning base. The positioning structure of the positioning component is moved to the designated position of the cylinder body to abut against it. After the oil pipe is connected to the limiting structure on the positioning structure, the relative position of the cylinder body and the oil pipe is accurately positioned. This can greatly improve the docking accuracy of the interface between the cylinder body and the oil pipe, reduce the risk of leakage, and improve the reliability of the hydraulic system after the oil pipe is assembled. It effectively solves the problem of poor reliability of the existing oil pipe assembly method.

[0007] In one optional embodiment, the support assembly includes a support base and two support rollers. The two support rollers are rotatably disposed on the top of the support base. The rotation axis of the support rollers extends along a first direction, and the two support rollers are spaced apart along a second direction, forming a support structure.

[0008] Beneficial effects: In this type of support component, after the support rollers come into contact with the cylinder surface, they can generate transmission as the cylinder moves. After the cylinder is placed, its circumferential position can be flexibly adjusted, which can form a reliable support and facilitate adjustment, effectively improving the flexibility of the positioning fixture.

[0009] In one alternative implementation, there are multiple support components, which are spaced apart along a first direction.

[0010] Beneficial effects: The simultaneous support of multiple support components can effectively reduce the pressure on a single support component. In addition, the simultaneous support of multiple support components with the cylinder can also improve the straightness of the cylinder after placement, so that the cylinder can be placed more stably and reliably in the designated position.

[0011] In one alternative embodiment, at least one end of the cylinder body has a hinge hole extending along a second direction; The fixing component includes a detachably connected fixing base and a fixing pin. The diameter of the fixing pin matches the inner diameter of the hinge hole. The fixing pin is adapted to be inserted into the hinge hole and connected to the fixing base, forming a fixing structure.

[0012] Beneficial effects: This type of fixing component, through the cooperation of the fixing seat and the fixing pin, can effectively fix the cylinder body and prevent the cylinder body from rotating or moving along the axis at will.

[0013] In one alternative embodiment, the mounting base has two mounting plates spaced apart along a second direction, each mounting plate having a mounting groove at its top for accommodating a mounting pin, and the space between the two mounting plates forming an accommodating space for accommodating the end of the cylinder body.

[0014] Beneficial effects: With this type of mounting base, the fixing pin can be corrected to the final position after it is engaged with two fixing slots, which can further improve the positioning accuracy of the cylinder. In addition, since the space between the two fixing plates forms a receiving space, the fixing plates can also play a guiding role, correcting the circumferential position of the cylinder itself as it enters the receiving space at the end of the cylinder.

[0015] In one alternative embodiment, the top of each fixing plate is bent away from the receiving space; and / or, one end of the fixing pin is provided with a handle.

[0016] Beneficial effects: This type of fixing plate setting allows for a wider entrance to the accommodating space, facilitating the entry of the cylinder from the end. In addition, it also serves as a guide, preventing the cylinder from colliding with the top of the fixing plate during placement. The handle makes it easier for operators to grip and move the fixing pin.

[0017] In one alternative embodiment, the positioning assembly includes a positioning seat and a positioning arm. The positioning arm is pivotally mounted on the positioning seat, forming a positioning structure. The positioning arm is provided with a positioning groove for abutting against the outer wall of the cylinder.

[0018] Beneficial effects: This type of positioning component is simple and reliable. The positioning arm can effectively avoid the cylinder and can also cooperate with the cylinder more quickly.

[0019] In one optional embodiment, the positioning arm is provided with a positioning hole, and the positioning structure includes a connecting pin and a connecting seat. One end of the connecting seat forms a first connecting end and the other end forms a second connecting end. The first connecting end is inserted into the positioning hole, and the portion of the first connecting end that protrudes from the positioning hole is provided with a limiting hole that runs radially through it. The connecting pin is inserted into the limiting hole to fix the connecting seat to the positioning hole. The second connecting end is used for detachable connection with the end of the oil pipe; and / or, the positioning groove is an arc-shaped groove that matches the outer wall of the cylinder body.

[0020] Beneficial effects: In this type of positioning structure, the connecting seat can be detachably connected to the positioning arm via a connecting pin. When the specifications and dimensions of the oil pipe change, the original connecting seat can be removed and replaced with a matching connecting seat to continue the positioning work. This effectively improves the flexibility and versatility of the positioning component. In addition, the positioning groove can also provide a secondary inspection function. When the inner wall of the positioning groove cannot fit well with the outer wall of the cylinder, it indicates that there is a deviation in the position of the cylinder. At this time, the placement of the cylinder can be checked, further improving the reliability of the subsequent assembly of the cylinder and the oil pipe.

[0021] In one alternative implementation, both the fixing component and the positioning component are detachably connected to the bearing surface via fastening parts.

[0022] Beneficial effects: When the size of the cylinder changes, the original fixing and positioning components can be removed and replaced with fixing and positioning components of matching specifications and sizes, so that the positioning fixture can continue to be used normally, which can effectively improve the versatility of the positioning fixture.

[0023] Secondly, the present invention also provides a hydraulic cylinder assembly production line, which includes the above-mentioned positioning fixture. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional schematic diagram of a positioning tool according to an embodiment of the present invention; Figure 2 for Figure 1 The front view of the positioning fixture shown; Figure 3 for Figure 2 Left view of the positioning fixture shown; Figure 4 for Figure 2 Top view of the positioning fixture shown; Figure 5 for Figure 4 A partially enlarged schematic diagram of the positioning arm of the positioning fixture shown.

[0026] Explanation of reference numerals in the attached figures: 1. Support platform; 101. Support surface; 2. Support components; 201. Support base; 202. Support rollers; 3. Fixing components; 301. Fixing base; 3011. Fixing plate; 3012. Fixing groove; 3013. Accommodating space; 302. Fixing pin; 3021. Handle; 4. Positioning assembly; 401. Positioning seat; 402. Positioning arm; 4021. Positioning groove; 4022. Positioning hole; 403. Connecting pin; 404. Connecting seat; 4041. First connecting end; 4042. Second connecting end; 4043. Limiting hole; 5. Cylinder block; 501. Hinge hole; 6. Oil pipe; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, in one aspect, a positioning fixture is provided for assembling a hydraulic cylinder, the hydraulic cylinder including a cylinder body 5 and an oil pipe 6. The positioning fixture includes: a support platform 1, a support component 2, a fixing component 3, and a positioning component 4. The support platform 1 has a support surface 101; the support component 2 is arranged on the support surface 101 along a first direction X and has a support structure for engaging with the outer wall of the cylinder body 5; the fixing component 3 is disposed on the support surface 101 and has a fixing structure for detachably connecting with the cylinder body 5; the positioning component 4 is disposed on the support surface 101 and located on one side of the support component 2 in a second direction Y. The positioning component 4 has a movable positioning structure for abutting against the outer wall of the cylinder body 5, and the positioning structure is provided with a limiting structure for fixing the oil pipe 6.

[0030] Using the positioning fixture of this embodiment, the cylinder 5 is supported by the support component 2, which initially restricts the position of the cylinder 5 on the support platform 1. The cylinder 5 is then restricted from moving along the axial direction and rotating along the circumferential direction by the fixing component 3 connected to the cylinder 5. After the cylinder 5 is fixed in a preset posture, the outer wall of the cylinder 5 is used as the positioning base. The positioning structure of the positioning component 4 is moved to the designated position of the cylinder 5 to abut against it. After the oil pipe 6 is connected to the limiting structure on the positioning structure, the precise positioning of the relative position of the cylinder 5 and the oil pipe 6 is achieved. This can greatly improve the docking accuracy of the interface between the cylinder 5 and the oil pipe 6, reduce the risk of leakage, and improve the reliability of the hydraulic system after the oil pipe is assembled. This effectively solves the problem of poor reliability of the existing oil pipe assembly method.

[0031] In this embodiment, the positioning fixture has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The first direction refers to... Figure 1 The direction of the "X" pointed to by the middle arrow, the second direction refers to Figure 1 The direction of the "Y" indicated by the middle arrow, the third direction refers to... Figure 1The direction of "Z" indicated by the middle arrow is perpendicular to each other in the first direction X, the second direction Y, and the third direction Z. It should be understood that the introduction of the first direction X, the second direction Y, and the third direction Z is merely for the convenience of describing spatial relationships and should not be construed as limiting the scope of the embodiments of this application. Therefore, the perpendicular relationship between the first direction X, the second direction Y, and the third direction Z can be interpreted, depending on the actual technical scenario, as the first direction X, the second direction Y, and the third direction Z representing three mutually perpendicular directions in three-dimensional space, or reasonably interpreted as a nearly perpendicular relationship between the first direction X, the second direction Y, and the third direction Z, for example, the included angles between the first direction X, the second direction Y, and the third direction Z are all within the range of 85°-95°... Any technical solution that conforms to the spirit of this invention or achieves the technical effects described in this invention can be considered to fall within the scope defined by the appended claims.

[0032] Specifically, in related technologies, due to manual assembly, after the cylinder body 5 and oil pipe 6 are assembled and installed in the corresponding equipment, leakage and other faults will occur at the interface positions of the cylinder body 5 and oil pipe 6 in 10% of the subsequent equipment operation. However, after using the positioning tooling of this embodiment, when the assembled cylinder body 5 and oil pipe 6 are working in the equipment, interface leakage and other faults will no longer occur within the same working time, which greatly improves the reliability of the hydraulic system after oil pipe assembly and reduces the failure rate of the equipment.

[0033] In one possible implementation, such as Figures 2 to 4 As shown, the support assembly 2 includes a support base 201 and two support rollers 202. The two support rollers 202 are rotatably mounted on the top of the support base 201. The rotation axis of the support rollers 202 extends along the first direction X, and the two support rollers 202 are spaced apart along the second direction Y. The support rollers 202 form a support structure. In this type of support assembly 2, after the support rollers 202 come into contact with the surface of the cylinder 5, they can generate transmission as the cylinder 5 moves. After the cylinder 5 is placed, its circumferential position can be flexibly adjusted. It can form a reliable support and is also easy to adjust, which can effectively improve the flexibility of the positioning fixture.

[0034] It is understood that, as an alternative implementation, the support component 2 may not be equipped with the support roller 202, but instead have a V-shaped, U-shaped, or other type of groove on the top of the support base 201 for support and positioning.

[0035] Specifically, in the relevant technology, when the cylinder 5 is supported by the support base 201 with a groove, the outer wall of the cylinder 5 will inevitably come into contact with the inner wall of the groove. Due to the heavy weight of the cylinder, the friction between the cylinder 5 and the groove is much higher than the friction between the cylinder 5 and the support roller 202. During the actual placement process, the cylinder 5 will first come into contact with one side wall of the groove. Due to the large friction generated during the contact, the cylinder 5 is likely to rotate slightly around the contact point under the action of this friction and eventually enter the groove. At this time, the cylinder 5 is misaligned compared to the initial state of the cylinder 5, which will form a positioning error in the subsequent positioning process.

[0036] In addition, since the friction between the cylinder body 5 and the groove wall is relatively large after the cylinder body 5 is placed in the groove, it is also difficult to adjust the axial position of the cylinder body 5, especially with slight rotation. It is often necessary to use a lifting tool to lift the cylinder body 5 again and place it. Due to the above reasons, the cylinder body 5 is still prone to misalignment and deflection after being placed again.

[0037] Using the positioning fixture of this embodiment can effectively avoid errors in the process of placing the cylinder 5 into the support component 2. After the cylinder 5 contacts one of the support rollers 202, it can be translated under the continued action of external force and will not rotate. Therefore, it can avoid deflection. Furthermore, even if deflection occurs, since the support rollers 202 can rotate, the operator can easily and quickly rotate the cylinder 5 to the specified angle. Therefore, the positioning fixture of this embodiment also has the feature of easy adjustment.

[0038] In one possible implementation, such as Figure 1 and Figure 2 As shown, there are multiple support components 2, which are spaced apart along the first direction X. The simultaneous support of multiple support components 2 can effectively reduce the pressure borne by a single support component 2. In addition, the simultaneous support of multiple support components 2 with the cylinder body 5 can also improve the straightness of the cylinder body 5 after placement, so that the cylinder body 5 can be placed more stably and reliably in the designated position.

[0039] Specifically, there is no limit to the number of support components 2; it can be two, three, four, or more.

[0040] Preferably, such as Figure 1 As shown, the positioning fixture in this embodiment has two support components 2, which can not only provide reliable support, but also avoid errors caused by too many support components 2, which would result in too many processing and assembly times.

[0041] In one possible implementation, such as Figure 2 and Figure 3As shown, at least one end of the cylinder body 5 has a hinge hole 501, which extends along the second direction Y. The fixing component 3 includes a detachably connected fixing seat 301 and a fixing pin 302. The diameter of the fixing pin 302 matches the inner diameter of the hinge hole 501. The fixing pin 302 is suitable for insertion into the hinge hole 501 and is connected to the fixing seat 301. The fixing pin 302 forms a fixing structure. This type of fixing component 3, through the cooperation of the fixing seat 301 and the fixing pin 302, can effectively fix the cylinder body 5 and prevent the cylinder body 5 from rotating or moving axially at will.

[0042] Specifically, there is no limit to the number of hinge holes 501 on the cylinder block 5. It can be that hinge holes 501 are provided at both ends, or that only one end has a hinge hole 501.

[0043] Furthermore, the connection between the fixing pin 302 and the fixing seat 301 is not limited. It can be a detachable connection through fastening components, or it can be provided with a groove for the fixing pin 302 to be placed, or it can be provided with a through hole for the fixing pin 302 to pass through. As long as the relative position of the fixing pin 302 and the fixing seat 301 can be fixed, it is acceptable.

[0044] In one possible implementation, such as Figure 3 and Figure 4 As shown, the fixing base 301 has two fixing plates 3011 spaced apart along the second direction Y. Each fixing plate 3011 has a fixing groove 3012 at its top for accommodating the fixing pin 302. The space between the two fixing plates 3011 forms an accommodating space 3013, which is used to accommodate the end of the cylinder body 5. With this type of fixing base 301, the fixing pin 302 can be corrected to its final position after cooperating with both fixing grooves 3012. The cylinder body 5 can be rotated to the designated position by the driving of the fixing pin 302, which can further improve the positioning accuracy of the cylinder body 5. In addition, since the space between the two fixing plates 3011 forms the accommodating space 3013, the fixing plates 3011 can also play a guiding role. The position of the cylinder body 5 along the circumferential direction can be corrected when the end of the cylinder body 5 enters the accommodating space.

[0045] Specifically, such as Figure 4 As shown, the form of the fixing groove 3012 is not limited; it can be an arc groove or a V-shaped groove, as long as it can guide and restrict the position of the fixing pin 302.

[0046] In one possible implementation, such as Figure 3As shown, the top of each fixing plate 3011 is bent away from the receiving space 3013. This type of fixing plate 3011 setting makes the entrance of the receiving space 3013 wider, which is convenient for the end of the cylinder 5 to enter. In addition, it can also play a guiding role to avoid the cylinder 5 from colliding with the top of the fixing plate 3011 during placement.

[0047] In one possible implementation, a handle 3021 is provided at one end of the fixing pin 302, which makes it easier for the operator to hold and move the fixing pin 302.

[0048] In one possible implementation, such as Figure 3 and Figure 4 As shown, the positioning component 4 includes a positioning base 401 and a positioning arm 402. The positioning arm 402 is swayably mounted on the positioning base 401, forming a positioning structure. The positioning arm 402 is provided with a positioning groove 4021 for abutting and engaging with the outer wall of the cylinder body 5. This type of positioning component 4 is simple and reliable. When the cylinder body 5 is not placed, the positioning arm 402 can be swayed conveniently and quickly in a direction away from the placement position of the cylinder body 5, which can effectively avoid collisions. After the cylinder body 5 is placed, the position of the oil pipe 6 can be quickly located using the outer wall of the cylinder body 5 as a reference.

[0049] Specifically, there is no limit to the length of the positioning arm 402, as long as it can abut and cooperate with the cylinder body 5.

[0050] Furthermore, there are no restrictions on the specific form of the positioning structure. It can be connected by fastening components, or it can be provided with holes or grooves for the insertion and fixing of the oil supply pipe 6, as long as the position of the oil pipe 6 can be accurately positioned.

[0051] In one possible implementation, such as Figure 4 and Figure 5 As shown, the positioning arm 402 is provided with a positioning hole 4022. The positioning structure includes a connecting pin 403 and a connecting seat 404. One end of the connecting seat 404 forms a first connecting end 4041 and the other end forms a second connecting end 4042. The first connecting end 4041 is inserted into the positioning hole 4022. The part of the first connecting end 4041 that protrudes from the positioning hole 4022 is provided with a limiting hole 4043 that runs radially through it. The connecting pin 403 is inserted into the limiting hole 4043 to fix the connecting seat 404 to the positioning hole 4022. The second connecting end 4042 is used to detachably connect to the end of the oil pipe 6. In this type of positioning structure, the connecting seat 404 can be detachably connected to the positioning arm 402 through the connecting pin 403. When the specifications and dimensions of the oil pipe 6 change, the original connecting seat 404 can be removed and replaced with a connecting seat 404 of the same size to continue the positioning work. This can effectively improve the flexibility and versatility of the positioning component 4.

[0052] Specifically, since the second connecting end 4042 of the connector 404 is connected to the oil pipe 6, there is no need to change the size of the first connecting end 4041, and various different connectors 404 can be matched with the positioning hole 4022 of the same size.

[0053] Furthermore, there is no limitation on the number of positioning structures and the number of positioning holes 4022; they can be, for example... Figure 3 The settings shown are for two groups, but more than three groups can also be set, depending on the number of oil pipes 6 that need to be fixed.

[0054] In one possible implementation, the positioning groove 4021 is an arc-shaped groove that matches the outer wall of the cylinder 5. This type of positioning groove 4021 can not only improve the accuracy of the matching between the positioning arm 402 and the cylinder 5, but also provide a secondary inspection function. When the inner wall of the positioning groove 4021 cannot match the outer wall of the cylinder 5 well, it indicates that there is a deviation in the position of the cylinder 5. At this time, the placement of the cylinder 5 can be checked, further improving the reliability of the subsequent assembly of the cylinder 5 and the oil pipe 6.

[0055] In one possible implementation, both the fixing component 3 and the positioning component 4 are detachably connected to the bearing surface 101 via fastening components. When the size of the cylinder body 5 changes, the original fixing component 3 and positioning component 4 can be removed and replaced with fixing components 3 and positioning components 4 of matching specifications and sizes, so that the positioning fixture can continue to be used normally, which can effectively improve the versatility of the positioning fixture.

[0056] Specifically, as shown in Figure 1, the fixing component 3, the positioning component 4, and the bearing surface 101 are all provided with through holes, and the fastening components can be detachably connected by passing through the corresponding through holes.

[0057] In one possible implementation, the bearing surface 101 is also provided with multiple lifting lugs to facilitate the overall movement and positioning of the hoisting equipment, eliminating the need for manual handling.

[0058] In one possible implementation, such as Figure 1 As shown, guide grooves are provided on the bearing surface 101 at the installation positions of the support component 2, the fixing component 3 and the positioning component 4. The guide grooves are connected to the edge of the bearing platform 1. The bottom of the support component 2, the fixing component 3 and the positioning component 4 are provided with guide blocks for interlocking with the guide grooves, so as to restrict their installation positions and reduce the positional deviation of the support component 2, the fixing component 3 and the positioning component 4 during the installation process.

[0059] According to an embodiment of the present invention, in another aspect, a hydraulic cylinder assembly production line is provided, which includes the positioning fixture described above.

[0060] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A positioning fixture for assembling a hydraulic cylinder, the hydraulic cylinder comprising a cylinder body (5) and an oil pipe (6), characterized in that, include: The support platform (1) has a support surface (101). The support assembly (2) is arranged on the bearing surface (101) along the first direction (X) and has a support structure for cooperating with the outer wall of the cylinder (5); A fixing component (3) is disposed on the bearing surface (101), the fixing component (3) having a fixing structure for detachably connecting to the cylinder body (5); The positioning component (4) is disposed on the bearing surface (101) and located on one side of the second direction (Y) of the support component (2). The positioning component (4) has a movable positioning structure for abutting against the outer wall of the cylinder (5). The positioning structure is provided with a limiting structure for fixing the oil pipe (6).

2. The positioning fixture according to claim 1, characterized in that, The support assembly (2) includes a support base (201) and two support rollers (202). The two support rollers (202) are rotatably disposed on the top of the support base (201). The rotation axis of the support rollers (202) extends along the first direction (X). The two support rollers (202) are spaced apart along the second direction (Y). The support rollers (202) form the support structure.

3. The positioning fixture according to claim 2, characterized in that, The number of support components (2) is multiple, and they are spaced apart along the first direction (X).

4. The positioning fixture according to any one of claims 1 to 3, characterized in that, At least one end of the cylinder (5) has a hinge hole (501) that extends along the second direction (Y). The fixing component (3) includes a detachably connected fixing base (301) and a fixing pin (302). The diameter of the fixing pin (302) matches the inner diameter of the hinge hole (501). The fixing pin (302) is adapted to be inserted into the hinge hole (501) and connected to the fixing base (301). The fixing pin (302) forms the fixing structure.

5. The positioning fixture according to claim 4, characterized in that, The mounting base (301) has two mounting plates (3011) spaced apart along the second direction (Y). Each mounting plate (3011) has a mounting groove (3012) at its top for accommodating the mounting pin (302). The space between the two mounting plates (3011) forms an accommodating space (3013) for accommodating the end of the cylinder (5).

6. The positioning fixture according to claim 5, characterized in that, The top of each of the fixing plates (3011) is bent away from the receiving space (3013); And / or, one end of the fixing pin (302) is provided with a handle (3021).

7. The positioning fixture according to any one of claims 1 to 3, characterized in that, The positioning component (4) includes a positioning seat (401) and a positioning arm (402). The positioning arm (402) is swayably disposed on the positioning seat (401). The positioning arm (402) forms a positioning structure. The positioning arm (402) is provided with a positioning groove (4021) for abutting and cooperating with the outer wall of the cylinder (5).

8. The positioning fixture according to claim 7, characterized in that, The positioning arm (402) is provided with a positioning hole (4022). The positioning structure includes a connecting pin (403) and a connecting seat (404). One end of the connecting seat (404) forms a first connecting end (4041) and the other end forms a second connecting end (4042). The first connecting end (4041) is inserted into the positioning hole (4022). The portion of the first connecting end (4041) that protrudes from the positioning hole (4022) is provided with a limiting hole (4043) that runs radially through it. The connecting pin (403) is inserted into the limiting hole (4043) to fix the connecting seat (404) to the positioning hole (4022). The second connecting end (4042) is used to detachably connect to the end of the oil pipe (6). And / or, the positioning groove (4021) is an arc-shaped groove that matches the outer wall of the cylinder (5).

9. The positioning fixture according to any one of claims 1 to 3, characterized in that, Both the fixing component (3) and the positioning component (4) are detachably connected to the bearing surface (101) via fastening components.

10. A hydraulic cylinder assembly production line, characterized in that, include: The positioning fixture according to any one of claims 1 to 9.

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