Chain wheel shaft head positioning machining clamp

Abstract

The utility model discloses a chain wheel shaft head positioning processing clamp which comprises a positioning plate and a positioning ring, the positioning ring is fixedly arranged on the front side of the positioning plate, a plurality of positioning arc-shaped shaft plates are arranged on the front side of the positioning plate in a surrounding and equidistant sliding mode, and a sliding mechanism used in cooperation with the positioning arc-shaped shaft plates is arranged on the front side of the positioning plate. The utility model relates to the technical field of chain wheel machining. According to the chain wheel shaft head positioning machining clamp, the multiple slidably-arranged positioning arc-shaped shaft plates are arranged on the front side of the positioning plate at equal intervals in a surrounding mode, and movable threaded rods and conical heads are arranged in the multiple positioning arc-shaped shaft plates, so that the multiple positioning arc-shaped shaft plates can be in extrusion sliding fit through the threaded rods and the conical heads; the inner diameter of the chain wheel is rapidly tensioned and positioned, and the problem that a traditional positioning shaft head is prone to being damaged and cannot be used due to the fact that the outer diameter of the chain wheel is changed through hard extrusion to position the chain wheel is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sprocket processing, in particular to a positioning and processing fixture for a sprocket shaft head. Background Art

[0002] A sprocket is a mechanical transmission device with teeth on its outer surface and a round hole in the center. For the convenience of machining the outer surface, it is mostly fixed and machined by the method of clamping inside the round hole. Inevitably, a positioning and processing fixture is needed for internal clamping and machining.

[0003] In view of this: Chinese Patent CN201500792U is an internal clamping fixture for rapid positioning and batch sizing of sprocket machining. It solves the problems of end face and outer circle machining of sized sprockets in batch production. It includes a mold body. One end of the mold body is a cylinder, and the other end is provided with a positioning ring concentric with the cylinder on the end face of the cylinder. A positioning shaft head is arranged inside the positioning ring. The length of the positioning shaft head is greater than that of the positioning ring. The mold body is provided with a central through hole. The central through hole is a tapered hole at one end of the positioning shaft head. A plurality of telescopic grooves are axially formed in the positioning shaft head. A pull rod is arranged inside the central through hole. The inner hole of the workpiece to be machined is sleeved on the outer diameter of the positioning shaft head. The pull rod is tightened, and the positioning shaft head extends outwards to clamp the workpiece to be machined, which is fast, efficient and has high positioning accuracy.

[0004] Although the above-mentioned uses the extrusion and horizontal pulling of the pull rod and the slight expansion deformation of the positioning shaft head to achieve rapid clamping, inevitably, there are still deficiencies in the actual use process. For example, frequent extrusion deformation will damage the elastic reset of the positioning shaft head itself, resulting in the positioning shaft head being prone to subsequent inconvenience in clamping and cooperating with the sprocket due to elastic damage. In order to avoid such problems, a positioning and processing fixture for a sprocket shaft head is proposed to solve the existing problems. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a positioning and processing fixture for a sprocket shaft head, which solves the problem that the positioning shaft head is prone to frequent extrusion deformation to complete sprocket positioning, resulting in irreversible elastic damage to the positioning shaft head and loss of the clamping and positioning effect of the positioning shaft head.

[0006] To achieve the above object, the utility model is realized by the following technical solutions: A positioning and machining fixture for a sprocket shaft head, comprising a positioning plate and a positioning ring. The positioning ring is fixedly arranged on the front side of the positioning plate. A plurality of positioning arc-shaped shaft plates are slidably arranged around the front side of the positioning plate at equal intervals, and a sliding mechanism used in cooperation with the positioning arc-shaped shaft plates is arranged on the front side of the positioning plate. A sprocket is sleeved on the surfaces of the plurality of positioning arc-shaped shaft plates. A threaded sleeve is fixedly connected to the rear side of the positioning plate. A threaded rod is threadedly connected inside the threaded sleeve, and one end of the threaded rod penetrates through the positioning plate and extends into the conical cavity formed by the plurality of positioning arc-shaped shaft plates. A conical head used in cooperation with the positioning arc-shaped shaft plates is fixedly connected to one end of the threaded rod.

[0007] Preferably, the sliding mechanism includes a guiding chute. The guiding chute is opened on the front side of the positioning plate. A guiding slider is slidably connected inside the guiding chute. A second return spring is fixedly connected between the guiding slider and the guiding chute. The front side of the adjacent guiding sliders is fixedly connected to the rear side of the positioning arc-shaped shaft plate.

[0008] Preferably, a receiving groove is opened on the surface of the positioning arc-shaped shaft plate. A limiting sleeve is fixedly arranged on the inner wall of the receiving groove through a slot. A limiting rod is slidably connected inside the limiting sleeve. A first return spring is fixedly connected between the limiting rod and the limiting sleeve. One end of the limiting rod and inside the receiving groove is fixedly connected to a Z-shaped plate, and the bent part at the bottom of the Z-shaped plate extends outside the positioning arc-shaped shaft plate. An external threaded locking rod is threadedly connected to the surface of the bent part at the top of the Z-shaped plate and inside the receiving groove through a threaded groove.

[0009] Preferably, a sliding plate is fixedly connected between the two sides of the inner cavity of the receiving groove. A sliding groove slidably adapted to the sliding plate is opened inside the bent part at the bottom of the Z-shaped plate.

[0010] Preferably, mounting notches are opened on both sides of the front side of the positioning plate.

[0011] Beneficial effects

[0012] The utility model provides a positioning and machining fixture for a sprocket shaft head. Compared with the prior art, the following beneficial effects are achieved: by equidistantly arranging a plurality of slidably arranged positioning arc-shaped shaft plates around the front side of the positioning plate, and arranging a movable threaded rod and a tapered head in the plurality of positioning arc-shaped shaft plates, the plurality of positioning arc-shaped shaft plates can be slidably matched through the extrusion of the threaded rod and the tapered head, so as to quickly tension and position the inner diameter of the sprocket, avoiding the problem that the traditional positioning shaft head is damaged and cannot be used due to hard extrusion to change the outer diameter for positioning the sprocket. Secondly, a Z-shaped plate is arranged in the positioning arc-shaped shaft plate, and an externally threaded locking rod is arranged on the surface of the Z-shaped plate in a threaded manner, so that when the positioning arc-shaped shaft plate slides and tensions through the driving of the tapered head in the inner diameter of the sprocket, the Z-shaped plate and the externally threaded locking rod can be synchronously driven by the tapered head to rise to the front side of the sprocket, thereby facilitating the locking and reinforcement of the front side of the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic external structure diagram of the utility model;

[0014] Figure 2 is a rear view of the structure of the positioning plate of the utility model;

[0015] Figure 3 is a side view of the internal structure of the positioning plate of the utility model;

[0016] Figure 4 is a schematic diagram of the structure of the sliding mechanism of the utility model;

[0017] Figure 5 For the utility model Figure 3 is a partial enlarged view at A in;

[0018] Figure 6 is a schematic diagram of the internal structure of the positioning arc-shaped shaft plate of the utility model.

[0019] In the figure: 1, positioning plate; 2, positioning ring; 3, positioning arc-shaped shaft plate; 4, sliding mechanism; 41, guiding chute; 42, guiding slider; 43, second return spring; 5, sprocket; 6, threaded sleeve; 7, threaded rod; 8, tapered head; 9, receiving groove; 10, limiting sleeve; 11, limiting rod; 12, first return spring; 13, Z-shaped plate; 14, externally threaded locking rod; 15, sliding plate; 16, chute; 17, mounting notch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the accompanying drawings in the embodiments of the utility model.

[0021] Please refer to Figures 1-6, the present utility model provides a technical solution: a positioning and machining fixture for a sprocket shaft head, comprising a positioning plate 1 and a positioning ring 2. The positioning ring 2 is fixedly arranged on the front side of the positioning plate 1, and mounting notches 17 are formed on both sides of the front side of the positioning plate 1.

[0022] Further, for the convenience of quickly clamping and positioning the sprocket 5, a plurality of positioning arc-shaped shaft plates 3 are slidably arranged equidistantly around the front side of the positioning plate 1, and a sliding mechanism 4 used in cooperation with the positioning arc-shaped shaft plates 3 is arranged on the front side of the positioning plate 1. The sliding mechanism 4 includes a guiding chute 41 opened on the front side of the positioning plate 1. A guiding slider 42 is slidably connected inside the guiding chute 41. A second return spring 43 is fixedly connected between the guiding slider 42 and the guiding chute 41. The front side of adjacent guiding sliders 42 is fixedly connected to the rear side of the positioning arc-shaped shaft plate 3. A sprocket 5 is sleeved on the surfaces of the plurality of positioning arc-shaped shaft plates 3 together. A threaded sleeve 6 is fixedly connected to the rear side of the positioning plate 1. A threaded rod 7 is threadedly connected inside the threaded sleeve 6, and one end of the threaded rod 7 penetrates through the positioning plate 1 and extends into the conical cavity formed by the plurality of positioning arc-shaped shaft plates 3. A conical head 8 used in cooperation with the positioning arc-shaped shaft plates 3 is fixedly connected to one end of the threaded rod 7.

[0023] Further, for the convenience of locking and strengthening the front side of the sprocket 5, a receiving groove 9 is formed on the surface of the positioning arc-shaped shaft plate 3. A limiting sleeve 10 is fixedly arranged on the inner wall of the receiving groove 9 through a slot. A limiting rod 11 is slidably connected inside the limiting sleeve 10. A first return spring 12 is fixedly connected between the limiting rod 11 and the limiting sleeve 10. One end of the limiting rod 11 and located inside the receiving groove 9 is fixedly connected to a Z-shaped plate 13, and the bent part at the bottom of the Z-shaped plate 13 extends outside the positioning arc-shaped shaft plate 3. An external threaded locking rod 14 is threadedly connected to the surface of the bent part at the top of the Z-shaped plate 13 and located inside the receiving groove 9 through a threaded groove. A sliding plate 15 is fixedly connected between the two sides of the inner cavity of the receiving groove 9. A sliding groove 16 slidably adapted to the sliding plate 15 is formed inside the bent part at the bottom of the Z-shaped plate 13.

[0024] During use, first slip the sprocket 5 over the outer surfaces of a number of positioning arc-shaped shaft plates 3. Then, push the sprocket 5 forward from front to back, causing the back side of the sprocket 5 to fit against the front side of the positioning ring 2. Subsequently, turn the threaded rod 7. The threaded rod 7 rotates and engages in a threaded fit with the threaded sleeve 6, causing the threaded rod 7 to drive the tapered head 8 to move backward. As the tapered head 8 moves backward, it expands and presses against the inner arc inclined surface of the positioning arc-shaped shaft plate 3, causing a number of positioning arc-shaped shaft plates 3 to move synchronously, thereby tensioning and fixing the inner diameter of the sprocket 5. When the tapered head 8 presses against the positioning arc-shaped shaft plate 3, it also presses against the Z-shaped plate 13. The bent portion at the bottom of the Z-shaped plate 13 is driven by the extrusion thrust to lift the entire Z-shaped plate 13 and the external thread locking rod 14. After the external thread locking rod 14 rises to the top of the storage groove 9, use a tool to turn the external thread locking rod 14, causing the end of the external thread locking rod 14 to lock the front side of the sprocket 5.

Claims

1. A sprocket shaft head positioning processing fixture, comprising a positioning plate (1) and a positioning ring (2), wherein the positioning ring (2) is fixedly arranged on the front side of the positioning plate (1), characterized in that: A plurality of positioning arc-shaped shaft plates (3) are equidistantly slidably arranged around the front side of the positioning plate (1), and a sliding mechanism (4) matched with the positioning arc-shaped shaft plates (3) is arranged on the front side of the positioning plate (1). A sprocket (5) is commonly sleeved on the surfaces of the plurality of positioning arc-shaped shaft plates (3). A threaded sleeve (6) is fixedly connected to the rear side of the positioning plate (1), and a threaded rod (7) is connected to the internal thread of the threaded sleeve (6), and one end of the threaded rod (7) passes through the positioning plate (1) and extends into a conical cavity formed by the plurality of positioning arc-shaped shaft plates (3), and one end of the threaded rod (7) is fixedly connected to a conical head (8) matched with the positioning arc-shaped shaft plates (3).

2. A sprocket shaft head positioning and processing fixture according to claim 1, characterized in that: The sliding mechanism (4) comprises a guide slot (41), wherein the guide slot (41) is provided on the front side of the positioning plate (1), wherein the guide slot (41) is internally slidably connected to a guide slider (42), wherein a second return spring (43) is fixedly connected between the guide slider (42) and the guide slot (41), and the front side of the adjacent guide slider (42) is fixedly connected to the rear side of the positioning arc-shaped shaft plate (3).

3. The sprocket shaft head positioning and processing fixture according to claim 1 is characterized in that: A receiving groove (9) is provided on the surface of the positioning arc-shaped shaft plate (3), and a limiting sleeve (10) is fixedly provided on the inner wall of the receiving groove (9) through a groove, and the limiting sleeve (10) is slidably connected to the inside of the limiting sleeve (10), and a first return spring (12) is fixedly connected between the limiting rod (11) and the limiting sleeve (10), and one end of the limiting rod (11) is fixedly connected to a Z-shaped plate (13) located inside the receiving groove (9), and the bottom bending part of the Z-shaped plate (13) extends to the outside of the positioning arc-shaped shaft plate (3), and the surface of the top bending part of the Z-shaped plate (13) located inside the receiving groove (9) is threadedly connected to an external thread locking rod (14) through a thread groove.

4. The sprocket shaft head positioning and processing fixture according to claim 3 is characterized in that: A slide plate (15) is fixedly connected between the two sides of the inner cavity of the storage groove (9), and a slide groove (16) slidably matched with the slide plate (15) is provided inside the bent part of the bottom of the Z-shaped plate (13).

5. The sprocket shaft head positioning and processing fixture according to claim 1 is characterized in that: Both sides of the front side of the positioning plate (1) are provided with mounting notches (17).

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