Hobbing procedure error-proofing clamp

Abstract

The utility model relates to the technical field of gear shaft machining, and discloses a gear hobbing procedure error-proofing clamp which comprises a lower top part and an upper tip capable of moving towards the lower top part, the lower top part comprises an upper shell, a transition base and a base which are sequentially arranged in a communicated mode from top to bottom, a lower pull rod is arranged in the base, and an upper pull rod is arranged at the upper end of the lower pull rod. A center seat is arranged at the upper end of the transition base and provided with a lower ejector pin, the outer wall of the center seat is sleeved with an elastic chuck penetrating out of the upper shell, a connecting piece is arranged between the elastic chuck and the upper pull rod, a mistake-proof auxiliary tool is arranged at the upper end of the lower ejector pin, and the length of the mistake-proof auxiliary tool is smaller than the distance from the inner spline to the farthest end of the gear shaft. The distance between the internal spline and the nearest end of the gear shaft is larger; when the gear shaft is placed mistakenly, the internal spline of the gear shaft makes contact with the mistake-proofing auxiliary tool, the gear shaft is jacked up by the mistake-proofing auxiliary tool, an operator recognizes that the distance between the gear shaft and the base is larger than the distance for correctly placing the gear shaft, and then machining is stopped.

Description

Technical Field

[0001] This utility model relates to the field of gear shaft processing technology, specifically to a fault-prevention fixture for gear hobbing. Background Art

[0002] When performing gear hobbing, a fixture on the worktable is usually used to clamp both ends of the gear shaft before machining. However, since the existing gear shaft has internal splines on its inner wall, and the position of the internal splines is not in the exact center of the gear shaft, it is necessary to determine whether the gear shaft is installed backwards before machining. However, it is not easy to distinguish the right or wrong from the appearance of the gear shaft, which often leads to problems during gear hobbing. Installing the gear shaft backwards during gear hobbing not only results in the loss of a machined part, but also poses a significant safety hazard if the incorrectly machined gear shaft enters the market because it is not easy to tell whether the machining error has occurred. To address this issue, we have proposed a gear hobbing process error-proof fixture to solve the above problems. Utility Model Content

[0003] The present invention aims to provide a mis-installation fixture for the gear hobbing process, so as to solve the problem that the gear shaft is often installed backwards during gear hobbing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a gear hobbing process error-proof fixture, comprising a lower top and an upper center that can move downwards. The lower top includes an upper shell, a transition base, and a base that are sequentially interconnected from top to bottom. The base has a reciprocating pull rod inside, and an upper pull rod at the upper end of the pull rod. The upper pull rod slides through the transition base. The upper end of the transition base has a center seat, and the center seat has a lower ejector pin located inside the upper shell. The outer wall of the center seat is fitted with an elastic chuck that extends through the upper shell, and the outer wall of the elastic chuck contacts the inner wall of the upper shell. A connecting member is provided between the elastic chuck and the upper pull rod, and the connecting member passes through the center seat. The upper end of the lower ejector pin has an error-proof auxiliary tool that can contact the internal spline, and the length of the error-proof auxiliary tool is less than the distance from the internal spline to the farthest end of the gear shaft, but greater than the distance from the internal spline to the nearest end of the gear shaft.

[0005] The beneficial effects of this solution are as follows: By setting an anti-error aid at the top of the upper center, it is possible to determine whether the gear shaft is installed backwards. When the gear shaft is incorrectly placed, the internal spline of the gear shaft contacts the anti-error aid, causing the gear shaft to be lifted by the anti-error aid. At this time, the upper center moves downwards and contacts the upper end of the gear shaft, resulting in an increase in the distance between the upper end of the gear shaft and the base. The lower end of the gear shaft does not contact the upper end of the lower ejector pin, allowing the operator to visually observe that the gear shaft is installed backwards and thus stop processing. When the gear shaft is correctly placed, the gear shaft is sleeved on the outer wall of the anti-error aid. The operator can visually observe that the lower end of the gear sleeve contacts the upper end of the lower ejector pin, which meets the processing requirements. At this time, the pull rod pulls the upper pull rod downwards, thereby pulling down the elastic chuck through the connecting piece. The elastic chuck clamps the lower end of the gear shaft during the downward movement, thus completing the clamping of the gear shaft.

[0006] Preferably, as an improvement, the error-proofing device is cylindrical, and the diameter of the error-proofing device is larger than the inner diameter of the internal spline and smaller than the inner diameter of the gear shaft.

[0007] The beneficial effects are as follows: by setting the error-proofing auxiliary tool to a cylindrical shape, the gear shaft, upper center, and lower ejector pin can be kept coaxial when the error-proofing auxiliary tool contacts the internal spline, thereby improving the accuracy of the position sensor and ensuring smooth machining.

[0008] Preferably, as an improvement, a positioning plate is provided at the lower end of the base, and the pull rod slides through the positioning plate.

[0009] The beneficial effect is that the positioning plate is used to limit the movement distance of the pull rod and prevent the pull rod from being pulled out of the base.

[0010] Preferably, as an improvement, the lower end of the elastic chuck is threaded with a threaded sleeve. The connecting parts include a long bolt and a bushing. The bushing passes through the transition base and the center seat in sequence. The threaded sleeve and the upper pull rod are both provided with threaded holes. The long bolt passes through the threaded holes in sequence through the upper pull rod and the bushing, and is threadedly connected to the threaded sleeve.

[0011] The beneficial effects are as follows: the threaded sleeve is used to install the connecting parts, the bushing is used to increase the support force between the threaded sleeve and the upper tie rod, and can also control the distance between the threaded sleeve and the upper tie rod, and the long bolt is used to connect the upper tie rod and the threaded sleeve.

[0012] Preferably, as an improvement, the upper end of the lower ejector pin is configured as a frustum, and the diameter of the upper end of the lower ejector pin frustum is smaller than the inner diameter of the gear shaft, while the diameter of the lower end of the lower ejector pin frustum is larger than the inner diameter of the gear shaft.

[0013] The beneficial effect is that by setting the lower ejector pin to a frustum shape, it can be ensured that the gear shaft and the lower ejector pin remain coaxial, thus ensuring the accuracy of machining.

[0014] Preferably, as an improvement, the upper end of the pull rod is provided with a snap-fit ​​cover, and the lower end of the pull rod is provided with a snap-fit ​​block, which can snap into the snap-fit ​​cover.

[0015] The beneficial effects are: the detachable design of the snap-fit ​​block and snap-fit ​​cover reduces the maintenance cost of the bottom top; when one part is damaged, only the damaged part needs to be replaced instead of replacing the whole part.

[0016] Preferably, as an improvement, the lower end of the pull rod is provided with a first hydraulic cylinder capable of pulling the pull rod to reciprocate.

[0017] The beneficial effect is that the first hydraulic cylinder is used to drive the pull rod to reciprocate in the vertical direction.

[0018] Preferably, as an improvement, the upper end of the upper tip is provided with a second hydraulic cylinder that can push the upper tip to slide back and forth.

[0019] The beneficial effect is that the second hydraulic cylinder is used to drive the upper center to reciprocate in the vertical direction.

[0020] Preferably, as an improvement, a position sensor is provided on the outer wall of the top tip, which can detect the distance between the top tip and the base.

[0021] The beneficial effect is that by identifying the distance between the top tip and the base through the position sensor, it is possible to more accurately determine whether the gear shaft is installed backwards. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the error-proof clamp according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following detailed description illustrates the specific implementation method:

[0024] The reference numerals in the accompanying drawings include: upper center 1, upper housing 2, transition base 3, base 4, pull rod 5, upper pull rod 6, center seat 7, lower ejector pin 8, elastic chuck 9, error prevention device 10, position sensor 11, positioning plate 12, threaded sleeve 13, long bolt 14, bushing 15, snap-fit ​​block 16, snap-fit ​​cover 17, gear shaft 18, internal spline 19.

[0025] Example

[0026] The basic implementation examples are as follows: Figure 1 As shown, Figure 1The gear hobbing process error-proof fixture shown includes a lower top and an upper center 1 that can move downwards. A second hydraulic cylinder that can push the upper center 1 to slide back and forth is fixedly installed at the upper end. The lower top includes an upper shell 2, a transition base 3, and a base 4 that are arranged sequentially from top to bottom and are connected to each other by bolts. A positioning plate 12 is fixedly installed at the lower end of the base 4. A pull rod 5 is vertically slidably installed in the middle of the positioning plate 12, and the upper end of the pull rod 5 extends into the base 4. A first hydraulic cylinder that can pull the pull rod 5 to move back and forth is provided at the lower end of the pull rod 5. A snap-fit ​​cover 17 is integrally formed at the upper end of the pull rod 5. The snap-fit ​​cover 17 is annular, and the lower end of the upper pull rod 6 is integrally formed with a snap-fit ​​block 16. The cross-section of the snap-fit ​​block 16 is T-shaped. The upper pull rod 6 is snapped onto the upper end of the lower pull rod 5 by the snap-fit ​​block 16 and the snap-fit ​​cover 17. Of course, the outer wall of the snap-fit ​​cover 17 can be threaded, and bolts can pass through the through holes and abut against the outer wall of the snap-fit ​​block 16, thereby fixing the snap-fit ​​cover 17 and the snap-fit ​​block 16. The upper pull rod 6 slides through the interior of the transition base 3. The upper end of the transition base 3 is fixedly installed with a center seat 7 by bolts. The center seat 7 is internally threaded with a lower ejector pin 8, and the lower ejector pin 8 is located inside the upper housing 2. The upper end of the lower ejector pin 8 is set in the shape of a frustum, and the upper diameter of the frustum of the lower ejector pin 8 is smaller than that of the upper end of the lower ejector pin 8. The inner diameter of the gear shaft 18 is larger than the lower end diameter of the cone of the lower ejector pin 8. An elastic chuck 9, penetrating the upper housing 2, is fitted onto the outer wall of the center seat 7. The outer wall of the elastic chuck 9 contacts the inner wall of the upper housing 2. The upper inner diameter of the upper housing is conical. When the elastic chuck 9 descends, it contracts along the upper inner wall of the upper housing 2, thereby clamping the gear shaft 18. A threaded sleeve 13 is threaded onto the lower outer wall of the elastic chuck 9. A connecting member is provided between the elastic chuck 9 and the upper pull rod 6, and this connecting member penetrates the center seat 7. The connecting member includes a long bolt 14 and a bushing 15. The bushing 15 passes through the transition base 3 and the center seat 7 from bottom to top. Both the threaded sleeve 13 and the upper pull rod 6 have threaded holes. The long bolt 14 passes through the threaded holes and passes through the upper pull rod 6 and the bushing 15 in sequence, and is threadedly connected to the threaded sleeve 13. The upper end of the lower ejector pin 8 is provided with a fault-prevention device 10 that can contact the inner spline 19. The fault-prevention device 10 is cylindrical, and the diameter of the fault-prevention device 10 is larger than the inner diameter of the inner spline 19 and smaller than the inner diameter of the gear shaft 18. The length of the fault-prevention device 10 is smaller than the distance from the inner spline 19 to the farthest end of the gear shaft 18 and larger than the distance from the inner spline 19 to the nearest end of the gear shaft 18. The outer wall of the upper center point 1 is provided with a position sensor 11, which can detect the distance between itself and the base 4.

[0027] The specific implementation process is as follows:

[0028] When the robotic arm picks up the gear shaft 18 and places it on the upper center 1, if the gear shaft 18 is installed backwards, the internal spline 19 of the gear shaft 18 will contact the error-proofing device 10, causing the gear shaft 18 to be lifted by the error-proofing device 10. At this time, the upper center 1 moves downwards and contacts the upper end of the gear shaft 18, so that the position sensor 11 on the outer wall of the upper center 1 detects that the distance between it and the base 4 is greater than the distance between the correctly placed position sensor 11 and the base 4, thus stopping the processing. When the gear shaft 18 is correctly placed, the gear shaft 18 is sleeved on the outer wall of the error-proofing device 10 and contacts the upper end of the lower ejector pin 8. At this time, the upper ejector pin moves downwards and contacts the upper end of the gear shaft 18, so that the position sensor 11 on the outer wall of the upper center 1 detects that the distance between it and the base 4 meets the processing requirements. At this time, the lower pull rod 5 pulls down the upper pull rod 6, thereby pulling down the elastic chuck 9 through the connecting piece, so that the elastic chuck 9 clamps the lower end of the gear shaft 18 during the downward movement, thus completing the clamping of the gear shaft 18.

[0029] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A tooling fixture for preventing errors in gear hobbing processes, characterized in that: The device includes a lower top and an upper center that can move downwards. The lower top includes an upper shell, a transition base, and a base that are sequentially connected from top to bottom. The base has a reciprocating pull rod inside, and an upper pull rod at the upper end of the pull rod. The upper pull rod slides through the transition base. The upper end of the transition base has a center seat, and the center seat has a lower ejector pin located inside the upper shell. The outer wall of the center seat is fitted with an elastic clamp that extends through the upper shell, and the outer wall of the elastic clamp contacts the inner wall of the upper shell. A connecting piece is provided between the elastic clamp and the upper pull rod, and the connecting piece passes through the center seat. The upper end of the lower ejector pin has an anti-misalignment device that can contact the internal spline, and the length of the anti-misalignment device is less than the distance from the internal spline to the farthest end of the gear shaft, but greater than the distance from the internal spline to the nearest end of the gear shaft.

2. The error-prevention fixture for gear hobbing as described in claim 1, characterized in that: The error-proofing device is cylindrical, and its diameter is larger than the inner diameter of the internal spline but smaller than the inner diameter of the gear shaft.

3. The error-prevention fixture for gear hobbing as described in claim 2, characterized in that: A positioning plate is provided at the bottom of the base, and the pull rod slides through the positioning plate.

4. The error-prevention fixture for gear hobbing as described in claim 3, characterized in that: The lower end of the elastic chuck is threaded with a threaded sleeve. The connecting parts include a long bolt and a bushing. The bushing passes through the transition base and the center seat in sequence. The threaded sleeve and the upper pull rod are both provided with threaded holes. The long bolt passes through the threaded holes in sequence through the upper pull rod and the bushing, and is threadedly connected to the threaded sleeve.

5. The error-prevention fixture for gear hobbing as described in claim 4, characterized in that: The upper end of the lower ejector pin is shaped like a frustum, and the diameter of the upper end of the lower ejector pin frustum is smaller than the inner diameter of the gear shaft, while the diameter of the lower end of the lower ejector pin frustum is larger than the inner diameter of the gear shaft.

6. The error-prevention fixture for gear hobbing as described in claim 5, characterized in that: The upper end of the pull rod is equipped with a snap-fit ​​cover, and the lower end of the pull rod is equipped with a snap-fit ​​block. The snap-fit ​​block can snap into the snap-fit ​​cover.

7. The error-prevention fixture for gear hobbing as described in claim 6, characterized in that: The lower end of the pull rod is equipped with a first hydraulic cylinder that can pull the pull rod to move back and forth.

8. The error-prevention fixture for gear hobbing as described in claim 7, characterized in that: The upper end of the upper tip is equipped with a second hydraulic cylinder that can push the upper tip to slide back and forth.

9. A gear hobbing process error-prevention fixture according to claim 8, characterized in that: A position sensor is installed on the outer wall of the top tip, which can detect the distance between the tip and the base.

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