An assembly device for interference fit press members

Abstract

The application discloses an assembly device for interference fit of a press part, which comprises an interference fit part to be assembled and an inner core rod, the interference fit part is provided with a sleeve opening in the axial direction, and a section of the inner core rod is interference fit in the sleeve opening in the axial direction after the interference fit part is assembled with the inner core rod; the assembly device comprises a sleeve part clamp, a lifting platform, a pressing rod and a pressing driving device; the interference fit part is fixed and installed on the sleeve part clamp in a vertical posture, and the sleeve opening faces upward; the pressing rod is above the sleeve part clamp, and the lower end of the pressing rod presses the upper end of the inner core rod in the working state, and the lower end of the inner core rod is aligned with the sleeve opening on the interference fit part; the problem that the interference fit part is prone to cracking and damage under the conditions of impact and temperature change in the later use process after leaving the factory can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of interference fit assembly. Background Technology

[0002] To enhance the strength of long plastic parts, an interference fit can be used to install a metal inner core rod within the plastic assembly, such as... Figure 1 As shown, this forms a high-strength structure. This structure, in which a metal inner core rod is fitted inside a plastic kit, is widely used in fitness equipment and other fields. In the existing assembly process of the interference fit 17 and the inner core rod 19, an impact device is generally used to impact the inner core rod 19 along the axial direction, so that the inner core rod 19 is inserted into the sleeve 18 of the interference fit 17 under the action of axial impact. This process has the characteristics of high efficiency and speed. However, in practice, due to defects in the mold process of the interference fitting 17, a small number of interference fittings 17 have a sleeve opening 18 that is narrow in whole or in part. If the inner core rod 19 is forcibly inserted into the excessively narrow sleeve opening 18 of the interference fitting 17, the inner core rod 19 will exert excessive expansion force on the inner wall of the interference fitting 17 after being inserted into the excessively narrow sleeve opening 18. Since the interference fitting 17 itself is a plastic part, it may not immediately develop expansion cracks. However, after such interference fittings 17 leave the factory, they are very prone to cracking and damage under conditions such as impact and temperature changes during later use, which will affect the after-sales service and reputation of the product. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an assembly device for interference fittings, so as to avoid the problem that interference fittings are prone to cracking and damage under conditions such as impact and temperature changes during later use after leaving the factory.

[0004] Technical solution: To achieve the above objective, the present invention provides an assembly device for an interference fit pressure member, comprising an interference fit kit and an inner core rod to be assembled. The interference fit kit has a sleeve opening along the axial direction. After the interference fit kit and the inner core rod are assembled, a section of the inner core rod is interference fitted into the sleeve opening along the axial direction.

[0005] The assembly device includes a kit fixture, a lifting platform, a pressing rod, and a pressing drive device; the interference fit kit is fixedly mounted on the kit fixture in a vertical position with the opening facing upward; The pressure rod is located above the kit fixture. In the working state, the lower end of the pressure rod presses against the upper end of the inner core rod, and the lower end of the inner core rod is aligned with the sleeve on the interference fit kit. The downward pressure rod is synchronized with the lifting platform; the downward pressure drive device drives and connects to the lifting platform.

[0006] Furthermore, it includes a fixed bracket, one side of which is fixedly provided with a vertical wall, and a downward driving device is installed on the upper part of the vertical wall.

[0007] Furthermore, the downward drive device includes a hinge seat fixed to one side of the upper end of the vertical wall, a lifting rod guide sleeve, a lifting rod, a connecting rod, a rocker arm, a drive arm, and a handle.

[0008] Furthermore, the lifting rod guide sleeve is fixed to the lower end of the hinge seat, the lifting rod moves through the vertical guide channel on the lifting rod guide sleeve, the lower end of the lifting rod is fixedly connected to the lifting platform, the upper end of the lifting rod is hinged to one end of the connecting rod through hinge a, one end of the rocker arm is hinged to the hinge seat through the second hinge, and the other end of the connecting rod is hinged to the other end of the rocker arm through hinge c; one end of the drive arm is fixedly connected to the end of the rocker arm near hinge c, and the other end of the drive arm is fixedly connected to the handle.

[0009] Furthermore, the upper end of the pressure rod is fixedly connected to the lifting platform.

[0010] Furthermore, a linear bearing guide is fixedly installed at the end of the lifting platform away from the vertical wall, and the lower pressure rod passes through it vertically and is guided to cooperate with the linear bearing guide; the lower pressure rod moves up and down under the guidance of the linear bearing guide.

[0011] Furthermore, the surface of the vertical wall near the lifting platform is friction surface a, a vertical seat is fixedly installed in the middle of the lower side of the lifting platform, a semi-circular eccentric self-locking wheel is provided on the side of the vertical seat away from the lower pressure rod, and a horizontal roller bracket is fixedly installed on the side of the middle of the vertical seat near the semi-circular eccentric self-locking wheel. The outer circumferential surface of the semi-circular eccentric self-locking wheel is a closed-loop outer circumferential surface formed by connecting the circular arc surface a and the vertical surface b end to end; the circular arc surface a and the vertical surface b face the vertical wall and the vertical seat respectively; in the initial state, there is a gap between the circular arc surface a and the friction surface a. The bearing hole at the eccentric position of the semicircular eccentric self-locking wheel is rotated and fitted with the roller bracket through a sliding bearing. Let the axis of the bearing hole at the eccentric position of the semicircular eccentric self-locking wheel be the first axis a, and the axis of the arc surface a be the second axis b. The first axis a and the second axis b are on the same horizontal line, and the first axis a is closer to the friction surface a than the second axis b. When the semicircular eccentric self-locking wheel rotates clockwise around the first axis a, the gap gradually narrows and the arc surface a is tangentially pressed against the friction surface a.

[0012] Furthermore, the lower section of the vertical seat is provided with a pair of transversely penetrating guide holes. A pair of transverse guide rods move laterally through the pair of guide holes. The ends of the pair of transverse guide rods near the semi-circular eccentric self-locking wheel are jointly fixedly connected to the push block, and the ends of the pair of transverse guide rods away from the semi-circular eccentric self-locking wheel are jointly fixedly connected to the roller support. A pressure-controlling roller is rotatably mounted on the roller support via bearings. An arc-shaped pressure-controlling slot is provided on the side of the lower pressure rod near the pressure-controlling roller. The inner contour of the arc-shaped pressure-controlling slot conforms to the outer contour of the pressure-controlling roller, and the pressure-controlling roller is rolled and locked in the arc-shaped pressure-controlling slot, with the outer contour of the pressure-controlling roller and the inner contour of the arc-shaped pressure-controlling slot in close contact. The vertical seat has a thrust spring seat fixed on the side near the semi-circular eccentric self-locking wheel at the upper end. A thrust spring is coaxially connected to the side of the thrust spring seat near the semi-circular eccentric self-locking wheel. The other end of the thrust spring is fixedly connected to the upper end of the vertical surface b and applies a thrust, which causes the semi-circular eccentric self-locking wheel to tend to rotate counterclockwise around the first axis a. The lower end of the vertical surface b limits and presses against the push block. Under the thrust of the thrust spring and the force transmission of the semi-circular eccentric self-locking wheel, the push block, the horizontal guide rod and the roller support, the outer contour of the pressure control roller is tightly pressed against the inner contour of the arc-shaped pressure control bayonet, realizing the positioning of the lower pressure rod and making the lower pressure rod rise and fall synchronously with the lifting platform.

[0013] Beneficial effects: This invention achieves downward pressure control of the lowering rod without using any electrical components or sensors, avoiding the problem of forcibly inserting the inner core rod downward into the narrow opening of the interference fit, which would later damage the interference fit and prevent the interference fit from cracking and being damaged easily during later use. Attached Figure Description

[0014] Figure 1 Disassembly diagram of the interference fit kit and inner core rod; Figure 2 This is an overall view of the first embodiment; Figure 3 This is an overall view of the second embodiment; Figure 4 for Figure 3 Enlarged view of mark 23. Detailed Implementation

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] As attached Figures 1 to 4 An assembly device for an interference fit fitting is shown, such as Figure 1 The assembly includes an interference fit 17 and an inner core rod 19 to be assembled. The interference fit 17 has a sleeve 18 along the axial direction. After the interference fit 17 and the inner core rod 19 are assembled, a section of the inner core rod 19 is interference fitted into the sleeve 18 along the axial direction.

[0017] like Figure 2The assembly device includes a kit fixture 22, a lifting platform 14, a pressing rod 13, and a pressing drive device 41. The interference fit kit 17 is fixedly mounted on the kit fixture 22 in a vertical position with the sleeve opening 18 facing upward. The pressing rod 13 is located above the kit fixture 22. In the working state, the lower end of the pressing rod 13 presses against the upper end of the inner core rod 19, and the lower end of the inner core rod 19 is aligned with the sleeve opening 18 on the interference fit kit 17. The pressing rod 13 is synchronized with the lifting platform 14. The pressing drive device 41 drives the lifting platform 14.

[0018] It also includes a base 21 and a fixed bracket 20. The kit clamp 22 is installed on the base 21. A vertical wall 3 is fixedly provided on one side of the fixed bracket 20. The downward driving device 41 is installed on the upper part of the vertical wall 3.

[0019] like Figure 2 The downward driving device 41 includes a hinge seat 30 fixed to one side of the upper end of the vertical wall 3, a lifting rod guide sleeve 32, a lifting rod 15, a connecting rod 26, a rocker arm 28, a driving arm 27 and a handle 24. The lifting rod guide sleeve 32 is fixed to the lower end of the hinge seat 30. The lifting rod 15 moves through the vertical guide channel 43 on the lifting rod guide sleeve 32. The lower end of the lifting rod 15 is fixedly connected to the lifting platform 14. The upper end of the lifting rod 15 is hinged to one end of the connecting rod 26 through hinge a 25. One end of the rocker arm 28 is hinged to the hinge seat 30 through the second hinge 29. The other end of the connecting rod 26 is hinged to the other end of the rocker arm 28 through hinge c 31. One end of the drive arm 27 is fixedly connected to the end of the rocker arm 28 near hinge c 31. The other end of the drive arm 27 is fixedly connected to the handle 24. The downward drive device 41 constitutes a force-saving structure. The lifting platform 14 can be raised and lowered by manually turning the handle 24.

[0020] Based on the above structure, this solution provides the following two embodiments: First embodiment: as follows Figure 2 As shown, the upper end of the lowering rod 13 is fixedly connected to the lifting platform 14. In this embodiment, although the resistance of the lowering rod 13 can be known through the force feedback of the staff, the magnitude of the downward force applied by the lowering rod 13 cannot be completely controlled because everyone's perception of the magnitude of force is different.

[0021] Second embodiment: as follows Figure 3 and 4As shown, a linear bearing guide 12 is fixedly installed at the end of the lifting platform 14 away from the vertical wall 3. The lower pressure rod 13 passes through the linear bearing guide 12 coaxially and is guided to cooperate with it. The lower pressure rod 13 moves up and down under the guidance of the linear bearing guide 12. The surface of the vertical wall 3 near the lifting platform 14 is a friction surface 3a. A vertical seat 8 is fixedly installed in the middle of the lower side of the lifting platform 14. A semi-circular eccentric self-locking wheel 1 is provided on the side of the vertical seat 8 away from the lower pressure rod 13. A transverse roller bracket 6 is fixedly installed in the middle of the vertical seat 8 near the semi-circular eccentric self-locking wheel 1. The outer circumferential surface of the semi-circular eccentric self-locking wheel 1 is a closed-loop outer circumferential surface formed by connecting the arc surface 1a and the vertical surface 1b end to end. 1a and vertical surface 1b face the vertical wall 3 and vertical seat 8 respectively; in the initial state, there is a gap 91 between the arc surface 1a and the friction surface 3a; the bearing hole 80 at the eccentric position of the semicircular eccentric self-locking wheel 1 rotates and engages with the roller bracket 6 through the sliding bearing 4. Let the axis of the bearing hole 80 at the eccentric position of the semicircular eccentric self-locking wheel 1 be the first axis 2a, and the axis of the arc surface 1a be the second axis 2b; the first axis 2a and the second axis 2b are on the same horizontal line, and the first axis 2a is closer to the friction surface 3a than the second axis 2b; when the semicircular eccentric self-locking wheel 1 rotates clockwise around the first axis 2a, the gap 91 gradually narrows, and the friction surface 3a is tangentially pressed against the arc surface 1a; The lower section of the vertical seat 8 is provided with a pair of transversely penetrating guide holes 72. A pair of transverse guide rods 7 pass through the pair of transverse guide holes 72. The ends of the pair of transverse guide rods 7 near the semi-circular eccentric self-locking wheel 1 are jointly fixedly connected to the push block 5. The ends of the pair of transverse guide rods 7 away from the semi-circular eccentric self-locking wheel 1 are jointly fixedly connected to the roller support 100. A pressure-controlling roller 10 is rotatably mounted on the roller support 100 via a bearing. The side of the lower pressure rod 13 near the pressure-controlling roller 10 is provided with an arc-shaped pressure-controlling slot 9. The inner contour of the arc-shaped pressure-controlling slot 9 is adapted to the outer contour of the pressure-controlling roller 10, and the pressure-controlling roller 10 is rolled and locked in the arc-shaped pressure-controlling slot 9, with the outer contour of the pressure-controlling roller 10 fitting against the inner contour of the arc-shaped pressure-controlling slot 9. A thrust spring seat 11 is fixed to the upper end of the seat 8 near the side of the semicircular eccentric self-locking wheel 1. A thrust spring 16 is coaxially connected to the side of the thrust spring seat 11 near the side of the semicircular eccentric self-locking wheel 1. The other end of the thrust spring 16 is fixedly connected to the upper end of the vertical surface 1b and applies a thrust, which causes the semicircular eccentric self-locking wheel 1 to have a tendency to rotate counterclockwise around the first axis 2a. The lower end of the vertical surface 1b limits and presses against the push block 5. Under the thrust of the thrust spring 16 and the force transmission of the semicircular eccentric self-locking wheel 1, the push block 5, the transverse guide rod 7 and the roller support 100, the outer contour of the pressure control roller 10 is tightly pressed against the inner contour of the arc-shaped pressure control slot 9, thereby positioning the lower pressure rod 13 and making the lower pressure rod 13 rise and fall synchronously with the lifting platform 14.

[0022] Working principle of the second embodiment: Step 1: Fix the interference fit 17 vertically on the fit fixture 22 with the sleeve 18 facing upward; then hold the vertical inner core rod 19 and align the lower end of the inner core rod 19 with the sleeve 18 on the interference fit 17. Step 2: Set a pressure critical value F, and manually operate the handle 24. Under the transmission of the force-saving transmission structure of the downward pressure drive device 41, the lifting platform 14 is driven to descend, so that the downward pressure rod 13 descends synchronously with the lifting platform 14. Then, the downward pressure rod 13 descends with the lifting platform 14 to the lower end to press the inner core rod 19. Under the downward pressure of the downward pressure rod 13, the inner core rod 19 is inserted into the sleeve 18 of the interference fit kit 17 with an interference fit until a section of the inner core rod 19 is interference fitted in the sleeve 18 along the axial direction, thus completing the assembly of the interference fit kit. During the process of inserting the inner core rod 19 downward into the sleeve 18 of the interference fit kit 17 in step two above, if the downward pressing force of the pressure rod 13 on the inner core rod 19 never exceeds the critical pressure value F, the lateral component force applied by the inner wall of the arc-shaped pressure control slot 9 to the pressure control roller 10 is insufficient to overcome the thrust of the thrust spring 16, so that the outer contour of the pressure control roller 10 and the inner contour of the arc-shaped pressure control slot 9 are always in a tight pressing fit, so that during step two, the pressure rod 13 and the lifting platform 14 always remain synchronized, the semi-circular eccentric self-locking wheel 1 does not rotate, there is a gap 91 between the arc surface 1a and the friction surface 3a, and the friction surface 3a does not form resistance to the descent of the lifting platform 14; If the downward thrust of the pressing rod 13 on the inner core rod 19 exceeds the critical pressure value F during the above process, it indicates that the sleeve opening 18 is too narrow overall or locally, resulting in excessive downward resistance. The sleeve opening 18 needs to be adjusted before insertion. If the inner core rod 19 is forcibly inserted into the narrow sleeve opening 18 of the interference fit 17 with an interference fit, the inner core rod 19 will burst the interference fit 17 after being inserted into the narrow sleeve opening 18, making the interference fit 17 prone to cracking and damage during later use.

[0023] During the process of inserting the inner core rod 19 downwards into the sleeve 18 of the interference fit kit 17 in step two above, if the downward pushing force of the pressing rod 13 on the inner core rod 19 exceeds the critical pressure value F, the lateral component of the force applied by the inner wall of the arc-shaped pressure control slot 9 to the pressure control roller 10 is just enough to overcome the pushing force of the thrust spring 16, thereby causing the pressure control roller 10 to roll out of the arc-shaped pressure control slot 9 (but not completely out). In the initial stage of the inner rolling action, the pressure roller 10 is laterally offset under the guidance of the transverse guide hole 72, and then, under the linkage of the transverse guide rod 7, the push block 5 is laterally pushed to the lower end of the vertical surface 1b, causing the semi-circular eccentric self-locking wheel 1 to rotate clockwise around the first axis 2a, so that the gap 91 gradually narrows until the arc surface 1a of the semi-circular eccentric self-locking wheel 1 rolls tangent to the friction surface 3a; at the same time, the lifting platform 14 continues to descend under the drive of the downward driving device 41, thereby causing the roller to... The bracket 6 drives the semi-circular eccentric self-locking wheel 1 to descend. Since the arc surface 1a of the semi-circular eccentric self-locking wheel 1 is already tangent to the friction surface 3a at this time, the descent of the semi-circular eccentric self-locking wheel 1 will drive itself to rotate further clockwise around the first axis 2a under the drive of rolling friction. Since the first axis 2a is closer to the friction surface 3a than the second axis 2b, during the process of the semi-circular eccentric self-locking wheel 1 rotating further clockwise around the first axis 2a, the contact position of the friction surface 3a and the arc surface 1a will interfere with each other. This will cause the interaction pressure between the friction surface 3a and the arc surface 1a to increase instantaneously as the lifting platform 14 descends, thereby instantly increasing the friction force between the friction surface 3a and the arc surface 1a. This will prevent the lifting platform 14 and the lowering rod 13 from descending further under the drive of the lowering drive device 41, and prevent the inner core rod 19 from being inserted into the overly narrow sleeve 18 and damaging the interference fit 17. At this time, the overly narrow sleeve 18 needs to be repaired and reassembled.

[0024] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An assembly device for an interference fitting, comprising an interference fitting (17) to be assembled and an inner core rod (19), wherein the interference fitting (17) is provided with a sleeve opening (18) along the axial direction, and after the interference fitting (17) and the inner core rod (19) are assembled, a section of the inner core rod (19) is interference fitted in the sleeve opening (18) along the axial direction; characterized in that The assembly device includes a kit fixture (22), a lifting platform (14), a pressure rod (13), and a pressure drive device (41); the interference fit kit (17) is fixedly mounted on the kit fixture (22) in a vertical position, with the sleeve opening (18) facing upward; The pressure rod (13) is located above the kit fixture (22). In the working state, the lower end of the pressure rod (13) presses against the upper end of the inner core rod (19), and the lower end of the inner core rod (19) is aligned with the sleeve (18) on the interference fit kit (17). The pressure rod (13) is synchronized with the lifting platform (14); the pressure drive device (41) drives the lifting platform (14). Includes a fixed bracket (20), and a vertical wall (3) is fixedly installed on one side of the fixed bracket (20); A linear bearing guide (12) is fixedly installed at one end of the lifting platform (14) away from the vertical wall (3). The lower pressure rod (13) passes through the linear bearing guide (12) vertically and is guided to cooperate with it. The lower pressure rod (13) moves up and down under the guidance of the linear bearing guide (12). The surface of the vertical wall (3) near the lifting platform (14) is a friction surface (3a). A vertical seat (8) is fixedly installed in the middle of the lower side of the lifting platform (14). A semi-circular eccentric self-locking wheel (1) is provided on the side of the vertical seat (8) away from the lower pressure rod (13). A horizontal roller bracket (6) is fixedly installed on the side of the middle of the vertical seat (8) near the semi-circular eccentric self-locking wheel (1). The outer circumferential surface of the semi-circular eccentric self-locking wheel (1) is a closed-loop outer circumferential surface formed by connecting the arc surface (1a) and the vertical surface (1b) end to end; the arc surface (1a) and the vertical surface (1b) face the vertical wall (3) and the vertical seat (8) respectively; in the initial state, there is a gap (91) between the arc surface (1a) and the friction surface (3a). The bearing hole (80) at the eccentric position of the semicircular eccentric self-locking wheel (1) is rotated and engaged with the roller bracket (6) through the sliding bearing (4). Let the axis of the bearing hole (80) at the eccentric position of the semicircular eccentric self-locking wheel (1) be the first axis (2a), and the axis of the arc surface (1a) be the second axis (2b). The first axis (2a) and the second axis (2b) are on the same horizontal line, and the first axis (2a) is closer to the friction surface (3a) than the second axis (2b). When the semicircular eccentric self-locking wheel (1) rotates clockwise around the first axis (2a), the gap (91) gradually narrows and the arc surface (1a) and the friction surface (3a) are tangential and press against each other. The lower section of the vertical seat (8) is provided with a pair of transverse guide holes (72) that are transversely connected. A pair of transverse guide rods (7) are transversely movable through the pair of transverse guide holes (72). The ends of the pair of transverse guide rods (7) near the semicircular eccentric self-locking wheel (1) are fixedly connected to the push block (5). The ends of the pair of transverse guide rods (7) away from the semicircular eccentric self-locking wheel (1) are fixedly connected to the roller support (100). A pressure control roller (10) is rotatably mounted on the roller support (100) through a bearing. The side of the lower pressure rod (13) near the pressure control roller (10) is provided with an arc-shaped pressure control slot (9). The inner contour of the arc-shaped pressure control slot (9) is adapted to the outer contour of the pressure control roller (10). The pressure control roller (10) is rolled and locked in the arc-shaped pressure control slot (9). The outer contour of the pressure control roller (10) fits the inner contour of the arc-shaped pressure control slot (9). A thrust spring seat (11) is fixed on the side of the upper end of the seat (8) near the semi-circular eccentric self-locking wheel (1). A thrust spring (16) is coaxially connected on the side of the thrust spring seat (11) near the semi-circular eccentric self-locking wheel (1). The other end of the thrust spring (16) is fixedly connected to the upper end of the vertical surface (1b) and applies a thrust, which makes the semi-circular eccentric self-locking wheel (1) tend to rotate counterclockwise around the first axis (2a). The lower end of the vertical surface (1b) limits the pressure contact of the push block (5). Under the thrust of the thrust spring (16) and the force transmission of the semi-circular eccentric self-locking wheel (1), the push block (5), the transverse guide rod (7) and the roller support (100), the outer contour of the pressure control roller (10) is tightly pressed against the inner contour of the arc-shaped pressure control slot (9) to achieve the positioning of the lower pressure rod (13) and make the lower pressure rod (13) and the lifting platform (14) rise and fall synchronously.

2. The assembly device for an interference fit fitting according to claim 1, characterized in that: The downward drive device (41) is installed on the upper part of the vertical wall (3).

3. The assembly device for an interference fit fitting according to claim 2, characterized in that: The downward drive device (41) includes a hinge seat (30) fixed to one side of the upper end of the vertical wall (3), a lifting rod guide sleeve (32), a lifting rod (15), a connecting rod (26), a rocker arm (28), a drive arm (27), and a handle (24).

4. The assembly device for an interference fit fitting according to claim 3, characterized in that: The lifting rod guide sleeve (32) is fixed to the lower end of the hinge seat (30). The lifting rod (15) moves through the vertical guide channel (43) on the lifting rod guide sleeve (32). The lower end of the lifting rod (15) is fixedly connected to the lifting platform (14). The upper end of the lifting rod (15) is hinged to one end of the connecting rod (26) through hinge a (25). One end of the rocker arm (28) is hinged to the hinge seat (30) through the second hinge (29). The other end of the connecting rod (26) is hinged to the other end of the rocker arm (28) through hinge c (31). One end of the drive arm (27) is fixedly connected to the end of the rocker arm (28) near hinge c (31). The other end of the drive arm (27) is fixedly connected to the handle (24).

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