General assembly tool for hydraulic tensioner assembly line

Abstract

The utility model discloses a hydraulic tensioner assembly line final assembly tool which comprises a final assembly working table, an upper platform face is arranged on the final assembly working table, a press-fitting plate is arranged between the final assembly working table and the upper platform face, a hydraulic machine is arranged on the upper platform face, and the hydraulic machine drives the press-fitting plate to ascend and descend. A positioning area for a machined tensioner workpiece is arranged between the press-fitting plate and the final assembly workbench, the tensioner workpiece is positioned in the vertical direction through the positioning area, a through hole for a pull rod to penetrate through during press-fitting loading is formed in the press-fitting plate, and a servo tightening device is arranged on the upper platform face. According to the tensioner assembly general assembly tool, the design that the vertical positioning area and the deflection self-adaption base are combined is adopted, the assembly efficiency is improved by 40%, and the 3-5 mm positioning deviation of a traditional clamp is eliminated; a 55-75-degree conical surface of the device compensates the deviation of + / -5 mm in the transverse direction, and the dynamic leveling technology adopts a universal ball support and a limiting piece combination formed on the periphery to compensate the 1-3-degree assembly deflection angle of a workpiece in real time.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic tensioner assembly technology, specifically to a hydraulic tensioner assembly line assembly fixture. Background Technology

[0002] In modern mechanical transmission systems, tensioners, as key dynamic adjustment components, are widely used in automotive timing systems, industrial conveying equipment, and other fields. Traditional tensioner assemblies mainly consist of spring assemblies, tie rods, lock nuts, and bases, and their assembly process involves multiple precision fitting steps.

[0003] The industry generally uses semi-automatic assembly lines for assembly. During assembly line assembly, the following problems are encountered, such as insufficient control of press-fit offset: when press-fitting springs and tie rods, the coaxiality deviation (>0.2mm) causes thread misalignment failure, requiring manual intervention for correction, which seriously restricts the assembly cycle (single piece time >45 seconds); poor compatibility with multiple specifications: for different models of tensioners, a complete set of tooling fixtures needs to be replaced, with a changeover time of up to 15-20 minutes.

[0004] In view of the above, it is necessary to propose a hydraulic tensioner assembly line assembly fixture to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects in the existing technology and provide a hydraulic tensioner assembly line assembly tooling.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A hydraulic tensioner assembly line assembly fixture includes an assembly workbench, an upper platform surface on the assembly workbench, a pressure plate between the assembly workbench and the upper platform surface, a hydraulic press on the upper platform surface, the hydraulic press driving the pressure plate to move up and down, the space between the pressure plate and the assembly workbench is a positioning area for the tensioner workpiece to be processed, the positioning area positioning the tensioner workpiece in the vertical direction, the pressure plate having a through hole for the tie rod to pass through during pressure loading, and a servo tightening device on the upper platform surface.

[0007] Furthermore, the upper platform surface is provided with a conical guide sleeve structure, the conical guide sleeve structure is provided with a conical surface, and the tip of the conical surface is provided with a sleeve portion that passes through a through hole, the sleeve portion guiding the pull rod.

[0008] Furthermore, the assembly workbench is provided with a deflection adaptive base, which includes a base plate. The upper surface of the base plate is provided with a positioning groove that matches the tensioner workpiece. The lower surface of the base plate is provided with a bottom center support relative to the center position of the positioning groove. Multiple side supports are provided between the base plate and the assembly workbench and around the center support.

[0009] Furthermore, the central support includes a spherical groove on the assembly workbench, and a spherical protrusion on the lower end face of the base plate that mates with the spherical groove. The spherical protrusion is placed in the spherical groove to form a universal ball connection, and the base plate is supported on the upper side of the assembly workbench so that a deflection gap is formed between the two.

[0010] Furthermore, the side support member shown includes a spring and a travel limit member. When the spring in the side support member is in a free state under the limit of the travel limit member, it supports the base plate and keeps it in a horizontal state. The travel limit member has upper dead point limit and lower dead point limit for the compression and extension of the spring.

[0011] Furthermore, the travel limiting component includes a limiting screw and a limiting nut. The assembly work platform is provided with a through hole for the limiting screw to slide through. An upper limiting nut is screwed onto the upper side of the assembly work platform and a lower limiting nut is screwed onto the lower side of the assembly work platform. A baffle is provided at the top of the limiting screw, and the spring is wound around the limiting screw and located between the baffle and the assembly platform.

[0012] Furthermore, the conical guide sleeve structure is a detachable design, and the lower end face of the pressure plate is provided with a positioning groove that matches the outer peripheral structure of the conical guide sleeve. An electromagnet is provided at the bottom of the positioning groove, and the conical guide sleeve structure is magnetically fixed on the pressure plate.

[0013] Furthermore, the opening angle of the conical surface is 55~75°.

[0014] Furthermore, the inner hole of the sleeve portion is clearance-fitted with the pull rod, with a single-sided clearance of 0.5~0.1mm.

[0015] The advantages and beneficial effects of this utility model are as follows: The assembly tooling of the hydraulic tensioner assembly line of this utility model adopts a combination design of vertical positioning area and deflection adaptive base, which improves the assembly efficiency by 40% and eliminates the 3-5mm positioning deviation of traditional fixtures; the 55-75° conical surface of this device compensates for the lateral deviation of ±5mm, and the dynamic leveling technology adopts a combination of universal ball support and surrounding limiting parts to compensate for the 1-3° assembly deviation of the workpiece in real time; the limiting screw is provided with limiting nuts on the upper and lower sides to achieve elastic support for the base plate and flexibly offset within a certain angle range. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a hydraulic tensioner assembly line assembly tooling according to the present invention;

[0017] Figure 2 This is a front view of the assembly workbench in this utility model;

[0018] Figure 3This is an exploded view of the final assembly workbench in this utility model;

[0019] In the diagram: 1. Assembly workbench; 2. Upper platform surface; 3. Press plate; 4. Hydraulic press; 5. Positioning area; 6. Tensioner workpiece; 7. Through hole; 8. Servo tightening device; 9. Conical guide sleeve structure; 10. Conical surface; 11. Sleeve part; 12. Deflection adaptive base; 13. Base plate; 14. Positioning groove; 15. Side support; 16. Spherical groove; 17. Spherical protrusion; 18. Deflection clearance; 19. Spring; 20. Stroke limiter; 21. Limiting screw; 22. Screw hole; 23. Upper limit nut; 24. Lower limit nut; 25. Baffle; 26. Positioning groove; 27. Electromagnet; 28. Guide column; 29. ​​Vibrating feeder. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0021] A hydraulic tensioner assembly line assembly fixture, such as Figure 1-3 As shown, the assembly includes an assembly workbench 1, an upper platform surface 2 on the assembly workbench 1, a pressure plate 3 between the assembly workbench and the upper platform surface 2, a hydraulic press 4 on the upper platform surface 2, the hydraulic press 4 driving the pressure plate 3 to move up and down, a positioning area 5 between the pressure plate 3 and the assembly workbench 1 for the tensioner workpiece 6 to be processed, the positioning area 5 positioning the tensioner workpiece 6 in the vertical direction, a through hole 7 on the pressure plate 3 for the tie rod to pass through during pressure loading, and a servo tightening device 8 on the upper platform surface 2. In actual use, the tensioner workpiece 6 can be picked up from the production line by a robotic arm and installed in the positioning area 5 of this tooling. Two 150-ton hydraulic presses 4 press down the pressing plate 3, so that the tie rod of the tensioner workpiece 6 is exposed from the through hole 7. At this time, the vibrating feeder 29 provides a large nut for assembly. The large nut is installed on the servo tightening device 8, and the servo tightening device 8 completes the falling and tightening operation, thereby installing the large nut on the tie rod of the tensioner workpiece 6, thus completing the final assembly operation of the workpiece.

[0022] Furthermore, in such Figure 1During the press-fitting operation shown, when the press-fitting plate 3 is pressed down, the tensioner spring 19 contracts, and the pull rod is exposed through the through hole 7. Then, the servo tightening device 8 is used to install the large nut at the end of the pull rod. The problem in this process is that if the hydraulic tensioner is placed in the positioning area 5 with a certain offset, the pull rod and the axis of the servo tightening device 8 will inevitably be misaligned, which will result in the large nut not being able to be tightened on the pull rod. Since it is not convenient to adjust the servo tightening device 8 laterally every time, this device is equipped with a tapered guide sleeve structure 9.

[0023] Specifically, a conical guide sleeve structure 9 is provided on the upper platform surface 2. The conical guide sleeve structure 9 has a conical surface 10, and the opening angle of the conical surface 10 is 55~75°. Preferably, the opening angle of the conical surface 10 is set to 60°. The tip of the conical surface 10 has a sleeve portion 11 that passes through the through hole 7, and the sleeve portion 11 guides the pull rod. During actual press-fitting, if the end of the pull rod deviates laterally, the pull rod can contact the conical surface 10, and through the guidance of the conical surface 10, it is guided into the sleeve portion 11, thereby maintaining sufficient accuracy, so that the servo tightening device 8 can move down directly and tighten the large nut onto the pull rod. Specifically, the inner hole of the sleeve portion 11 is clearance-fitted with the pull rod, and the clearance on one side is 0.5~0.1mm.

[0024] Furthermore, the conical guide sleeve structure 9 is a detachable design. The lower end face of the pressure plate 3 is provided with a positioning groove 26 that mates with the outer peripheral structure of the conical guide sleeve. An electromagnet 27 is provided at the bottom of the positioning groove 26. The conical guide sleeve structure 9 is magnetically fixedly installed on the pressure plate 3. Figure 2 As shown, the conical guide sleeve structure 9 is attracted and fixed on the pressure plate 3 by the electromagnet 27, which can realize the flexible operation of changing different conical surfaces 10, so that this workbench can be adapted to the assembly of more models of tensioners, and the conical surfaces 10 with different opening angles can be replaced to adapt to the assembly of tensioners of different sizes.

[0025] The above describes the process of fine-tuning the lateral movement of the upper end of the tensioner workpiece 6 during the press-fitting process. When fine-tuning the lateral movement of the top, a lateral torque will also be generated on its base under pressure. If the torque is too large, the tie rod may bend laterally. In order to avoid this situation,

[0026] An adaptive deflection base 12 is provided on the assembly workbench 1, which includes a base plate 13. The upper surface of the base plate 13 is provided with a positioning groove 14 that matches the tensioner workpiece 6. The positioning groove 14 is used to pre-position the base of the workpiece. During assembly, the bottom of the tensioner workpiece 6 is aligned with the positioning groove 14 and placed upright. Then, during the pressing process, the position of the workpiece can be kept roughly aligned with the servo tightening device 8 at the upper end. However, if the pull rod deviates to a certain extent during pressing, a certain bending moment will also be generated at the base when it is corrected by the sleeve part 11. In order to avoid the bending moment affecting the quality of the workpiece,

[0027] As an improvement, a bottom center support is provided at the center position of the lower end face of the base plate 13 relative to the positioning groove 14, and a plurality of side support members 15 are provided between the base plate 13 and the final assembly workbench 1 and around the center support.

[0028] Furthermore, the central support includes a spherical groove 16 on the assembly workbench 1, and a spherical protrusion 17 on the lower end face of the base plate 13 that mates with the spherical groove 16. The spherical protrusion 17 is placed within the spherical groove 16 to form a universal ball connection, and supports the base plate 13 on the upper side of the assembly workbench 1, creating a deflection gap 18 between them. During the press-fitting process, if the upper end offset applies a bending moment to the lower end, the universal ball connection formed by the spherical groove 16 and the spherical protrusion 17 can generate a certain lateral bending deformation, thereby compensating for the lateral tilt of the workpiece at a certain angle during press-fitting, avoiding the bending moment from affecting the quality of the workpiece. Moreover, the contact fit between the spherical groove 16 and the spherical protrusion 17 provides good support performance.

[0029] Specifically, the side support 15 shown includes a spring 19 and a travel limiter 20. The spring 19 in the side support 15, arranged around the perimeter, supports the base plate 13 in a horizontal state when in a free state under the limitation of the travel limiter 20. The travel limiter 20 has upper and lower dead center limits for the compression and extension of the spring 19. Figure 2 , 3As shown, the stroke limiting component 20 includes a limiting screw 21 and a limiting nut. The assembly workbench 1 is provided with a screw hole 22 through which the limiting screw 21 slides. An upper limiting nut 23 is screwed onto the upper side of the assembly workbench 21, and a lower limiting nut 24 is screwed onto the lower side of the assembly workbench 21. A baffle 25 is provided at the top of the limiting screw 21, and a spring 19 is wound around the limiting screw 21 and located between the baffle 25 and the assembly platform. It can be understood that during press fitting, if the offset causes a bending moment to be applied to the tensioner workpiece 6, the side support 15 on the bent side will be compressed, thereby causing the workpiece to tilt to a certain extent to avoid damage to the workpiece caused by the bending moment. During compression, the upper limiting nut 23 can limit the downward pressure, while the lower limiting nut 24 can limit the upper baffle 25 to float at the highest position. The distance between the two is its stroke. The length of this stroke can be flexibly changed by adjusting the two nuts.

[0030] Assembly process description:

[0031] The hydraulic tensioner to be assembled is placed vertically in the positioning groove 14 of the deflection adaptive base 12, and the hydraulic press 4 is started to drive the pressing plate 3 to press down. The position of the tie rod is automatically corrected by the 55-75° conical surface 10 of the tapered guide sleeve, and the sleeve part 11 guides the tie rod to pass precisely through the through hole 7 with a gap of 0.5-0.1mm. When the spring 19 is compressed to the target preload, the servo tightening device 8 automatically tightens the nut to complete the fixation. During this process, the universal connection formed by the spherical protrusion 17 and the groove, together with the spring 19 for support, ensures that the base plate 13 always adaptively compensates for the offset of the tie rod during the pressing of the tensioner, avoiding excessive lateral force on the workpiece during the pressing process, which could lead to bending.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hydraulic tensioner assembly line assembly fixture, characterized in that, The assembly includes an assembly workbench (1), an upper platform surface (2) on the assembly workbench (1), a pressure plate (3) between the assembly workbench and the upper platform surface (2), a hydraulic press (4) on the upper platform surface (2), the hydraulic press (4) driving the pressure plate (3) to move up and down, the pressure plate (3) and the assembly workbench (1) are a positioning area (5) for the tensioner workpiece (6) to be processed, the positioning area (5) positions the tensioner workpiece (6) in the vertical direction, the pressure plate (3) is provided with a through hole (7) for the tie rod to pass through during pressure loading, and a servo tightening device (8) is provided on the upper platform surface (2). The upper platform surface (2) is provided with a conical guide sleeve structure (9), the conical guide sleeve structure (9) is provided with a conical surface (10), the tip of the conical surface (10) is provided with a sleeve part (11) that passes through the through hole (7), and the sleeve part (11) guides the pull rod. The assembly workbench (1) is provided with a deflection adaptive base (12), which includes a base plate (13). The upper end face of the base plate (13) is provided with a positioning groove (14) that matches the tensioner workpiece (6). The lower end face of the base plate (13) is provided with a bottom center support relative to the center position of the positioning groove (14). The base plate (13) and the assembly workbench (1) are provided with multiple side supports (15) around the center support.

2. The assembly tooling for a hydraulic tensioner assembly line according to claim 1, characterized in that, The central support includes a spherical groove (16) provided on the assembly workbench (1), and a spherical protrusion (17) provided on the lower end face of the base plate (13) that cooperates with the spherical groove (16). The spherical protrusion (17) is placed in the spherical groove (16) to form a universal ball connection, and supports the base plate (13) on the upper side of the assembly workbench (1) so that a deflection gap (18) is formed between the two.

3. The assembly tooling for a hydraulic tensioner assembly line according to claim 2, characterized in that, The side support member (15) shown includes a spring (19) and a stroke limit member (20). The spring (19) in the side support member (15) arranged around the perimeter supports the base plate (13) in a horizontal state when it is in a free state under the limit of the stroke limit member (20). The stroke limit member (20) has an upper dead point limit and a lower dead point limit for the compression and extension of the spring (19).

4. The assembly tooling for a hydraulic tensioner assembly line according to claim 3, characterized in that, The travel limiting component (20) includes a limiting screw (21) and a limiting nut. The assembly work platform (1) is provided with a screw hole (22) through which the limiting screw (21) slides. The limiting screw (21) is screwed with an upper limiting nut (23) on the upper side of the assembly work platform and a lower limiting nut (24) on the lower side of the assembly work platform. The top of the limiting screw (21) is provided with a baffle (25). The spring (19) is wound around the limiting screw (21) and located between the baffle (25) and the assembly platform.

5. The assembly tooling for a hydraulic tensioner assembly line according to claim 1, characterized in that, The conical guide sleeve structure (9) is a detachable design. The lower end face of the pressure plate (3) is provided with a positioning groove (26) that matches the outer peripheral structure of the conical guide sleeve. An electromagnet (27) is provided at the bottom of the positioning groove (26). The conical guide sleeve structure (9) is magnetically fixed on the pressure plate (3).

6. The assembly tooling for a hydraulic tensioner assembly line according to claim 1, characterized in that, The opening angle of the conical surface (10) is 55~75°.

7. The assembly tooling for a hydraulic tensioner assembly line according to claim 1, characterized in that, The inner hole of the sleeve (11) is clearance-fitted with the tie rod, with a single-sided clearance of 0.5~0.1mm.

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