Fixture expansion pin positioning device

Abstract

The utility model discloses a fixture expansion pin positioning device, which relates to the field of automobile part processing and comprises a positioning pin body, an inner hole is formed in the center of the positioning pin body in a penetrating manner and is used for placing an expansion block push rod, and a plurality of sliding chutes are uniformly formed in the upper part of the outer wall of the positioning pin body along the circumferential direction and are communicated with the inner hole; the expansion blocks are arranged in the sliding grooves in a one-to-one correspondence mode and matched with the expansion block push rods through slopes. The cylinder is arranged at the lower part of the positioning pin body and is used for driving the cylinder connecting rod which extends into the inner hole and is connected with and drives the expansion block push rod; and the welding slag preventing cover plate is detachably mounted at the top of the positioning pin body and shields the inner hole and the expansion block push rod. The problem that a clamp mechanism cannot be used due to welding spatter generated in the welding process is solved; and the product size qualification rate is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts processing, in particular to a fixture expansion pin positioning device. Background Art

[0002] Chinese patent document (CN211759441U) discloses a fixture structure that utilizes an expansion pin to position a sleeve, which relates to the field of automotive parts processing. The fixture structure mainly includes a cylinder connecting rod A (3'), a tapered pin (5'), an expansion block (4'), a cylinder pressure block (2'), and a round sleeve (1'). The tapered pin head, driven by the cylinder connecting rod, penetrates the expansion block and can move up and down within the expansion block. The cylinder pressure block presses on the top of the expansion block. The round sleeve is sleeved outside the expansion block. The cylinder connecting rod pushes the tapered pin forward, causing the expansion block to expand and fix the sleeve in position. When assembling this solution, the cylinder and tapered pin are retracted, the four expansion positioning blocks are in a loose state, and the round sleeve can be installed smoothly. When clamping and positioning, the expansion block expands around the central axis to ensure the sleeve is positioned.

[0003] However, in the existing technical solution, the tapered pin has no protective device, and the welding spatter generated during welding is easily splashed between the tapered pin and the expansion block, causing the expansion block to be unable to expand, affecting the positioning accuracy, and resulting in unqualified product dimensions. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a fixture expansion pin positioning device to solve the problem that the fixture mechanism cannot be used due to welding spatter generated during welding; and to improve the product size qualification rate.

[0005] The purpose of the utility model is to achieve the following technical solutions: This fixture expansion pin positioning device includes:

[0006] The positioning pin body has an inner hole formed through the center thereof for receiving the expansion block push rod. A plurality of sliding grooves are evenly formed along the circumferential direction on the upper portion of the outer wall of the positioning pin body, and the sliding grooves are connected to the inner hole;

[0007] Several expansion blocks are placed in the slide grooves one by one and matched with the expansion block push rods through the inclined surface;

[0008] A cylinder is provided at the lower part of the positioning pin body and is used to drive a cylinder connecting rod, which extends into the inner hole and is connected to the push rod of the expansion block; and

[0009] The anti-welding slag cover plate can be detachably installed on the top of the positioning pin body to shield the inner hole and the expansion block push rod;

[0010] When installing, the cylinder connecting rod pushes the expansion block push rod to extend, so that the expansion block retracts radially inward along the slide slot, making it easier to install the round sleeve on the upper part of the positioning pin body;

[0011] When clamping and positioning, the cylinder connecting rod pulls the expansion block push rod back, causing the expansion block to expand outward along the radial direction of the slide groove, thereby expanding the round sleeve.

[0012] As a further technical solution, an expanding block inclined surface is provided on one side of the expanding block where it cooperates with the expanding block push rod, and a push rod inclined surface is provided on the expanding block push rod at a position matching each expanding block inclined surface.

[0013] As a further technical solution, the center of the inclined surface of the expansion block extends outward to form a protrusion with a "T"-shaped cross-section, and a slot with a "T"-shaped cross-section is opened in the center of the inclined surface of each push rod for snapping into the protrusion to allow the expansion block to slide relatively along the slot.

[0014] As a further technical solution, a center hole is formed through the expansion block push rod for installing a connecting screw, and the connecting screw is fixed to the blind hole at the top of the cylinder connecting rod.

[0015] The beneficial effects of the utility model are:

[0016] 1. Installing a welding slag cover on the top of the positioning pin can effectively prevent welding spatter generated during welding from entering the inner hole, protect the expansion block and the expansion block push rod, extend the service life of the fixture mechanism, and improve positioning accuracy;

[0017] 2. The expansion block and the expansion block push rod adopt the sliding fit of inclined surface and slot, which ensures efficient clamping and contraction and smooth operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the prior art.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model.

[0020] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0021] Figure 4 for Figure 3 AA cross-sectional view.

[0022] Figure 5 for Figure 3 BB cross-sectional view.

[0023] Figure 6 It is a structural schematic diagram of the rising block in the utility model.

[0024] Figure 7 It is a structural schematic diagram of the positioning pin body in the utility model.

[0025] Figure 8 This is a schematic diagram of the connection structure between the expansion block push rod and the cylinder connecting rod in the utility model.

[0026] Figure 9 This is a schematic diagram of the matching structure between the expansion block push rod and the expansion block in the utility model.

[0027] Description of reference numerals: round sleeve 1', cylinder pressure block 2', cylinder connecting rod A3', expansion block 4', tapered pin 5';

[0028] Anti-welding slag cover plate 1, expansion block 2, expansion block inclined surface 21, protrusion 22, positioning pin body 3, inner hole 31, slide groove 32, cylinder connecting rod 4, expansion block push rod 5, slot 51, push rod inclined surface 52, center hole 53, connecting screw 6, cylinder 7. DETAILED DESCRIPTION

[0029] The following is a detailed introduction to the present invention with reference to the accompanying drawings:

[0030] Example: As shown in the attached Figures 2 to 9 As shown, this clamp expansion pin positioning device includes a welding slag protection cover plate 1, an expansion block 2, an expansion block inclined surface 21, a protrusion 22, a positioning pin body 3, an inner hole 31, a slide groove 32, a cylinder connecting rod 4, an expansion block push rod 5, a slot 51, a push rod inclined surface 52, a center hole 53, a connecting screw 6 and a cylinder 7.

[0031] Reference Attachment Figure 5 、 7 An inner hole 31 is formed through the center of the positioning pin body 3, into which the expansion block push rod 5 is inserted. Preferably, a limiting step is provided on the wall of the inner hole 31 to limit the axial sliding travel of the expansion block push rod 5 along the inner hole 31. Four sliding grooves 32 are radially formed through the upper portion of the outer wall of the positioning pin body 3. The sliding grooves 32 are evenly distributed along the circumference of the positioning pin body 3 and communicate with the inner hole 31.

[0032] like Figure 2 、 4 As shown, a rising block 2 (four in total) is placed in each chute 32 in a one-to-one correspondence, and the rising block 2 and the rising block push rod 5 are matched through the inclined surface. Figure 6 、 8 As shown in Figures 9 and 9, an expansion block 2 is provided with an expansion block inclined surface 21 on one side where the expansion block 2 and the expansion block push rod 5 mate. A push rod inclined surface 52 is provided on the expansion block push rod 5 at a position matching each expansion block inclined surface 21. A protrusion 22 with a "T"-shaped cross section is formed outward from the center of the expansion block inclined surface 21. Each push rod inclined surface 52 has a "T"-shaped cross-sectional slot 51 defined in the center thereof. The protrusion 22 can be engaged with the center of the push rod inclined surface 52, allowing the expansion block 2 to slide relative to the center of the slot 51.

[0033] Furthermore, a central hole 53 (using a countersunk hole design) is formed through the expansion block push rod 5 to install a connecting screw 6, which is fixed to the blind hole at the top of the cylinder connecting rod 4. Figure 4 、5 As shown, the cylinder 7 is fixedly connected to the lower portion of the positioning pin body 3 and can drive the cylinder connecting rod 4, which extends into the inner hole 31 and connects to the expansion block push rod 5. The welding slag shield 1 is removably mounted on the top of the positioning pin body 3 by screws, shielding the inner hole 31 and the expansion block push rod 5. It can effectively prevent welding spatter generated during welding from entering the inner hole, protecting the expansion block and expansion block push rod, extending the service life of the clamp mechanism, and improving positioning accuracy.

[0034] When installing, the cylinder connecting rod 4 pushes the expansion block push rod 5 to extend, so that the expansion block 2 retracts radially inward along the slide groove 32, making it easier to install the round sleeve on the upper part of the positioning pin body 3; when clamping and positioning, the cylinder connecting rod 4 pulls the expansion block push rod 5 to retract, so that the expansion block 2 expands radially outward along the slide groove 32, thereby tightening the round sleeve.

[0035] The working process of the present invention is as follows: Before assembling the circular sleeve, the pneumatic cylinder 7 drives the cylinder connecting rod 4 upward, which pushes the expansion block push rod 5 outward. Under the action of the inclined surface, the expansion block 2 retracts radially inward along the chute 32. The circular sleeve can then be installed on the upper portion of the positioning pin body 3. When the fixture is clamped and positioned, the pneumatic cylinder 7 drives the cylinder connecting rod 4 downward, which pulls the expansion block push rod 5 back. Under the action of the inclined surface, the expansion block 2 expands radially outward along the chute 32, thereby tightening the circular sleeve and positioning the circular sleeve. Welding can then begin. To remove the workpiece after welding, the pneumatic cylinder 7 drives the cylinder connecting rod 4 upward again, which pushes the expansion block push rod 5 outward. Under the action of the inclined surface, the expansion block 2 retracts radially inward along the chute 32, allowing the workpiece to be removed smoothly.

[0036] It is understandable that for those skilled in the art, any equivalent replacement or change of the technical solution and the concept of the utility model should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A fixture expansion pin positioning device, characterized in that: include: The positioning pin body (3) has an inner hole (31) extending through the center thereof for receiving the expansion block push rod (5). A plurality of sliding grooves (32) are evenly provided on the upper portion of the outer wall of the positioning pin body (3) along the circumferential direction, and the sliding grooves (32) are communicated with the inner hole (31). A plurality of expansion blocks (2) are placed in the slide groove (32) in a one-to-one correspondence and are matched with the expansion block push rod (5) through an inclined surface; A cylinder (7) is provided at the lower portion of the positioning pin body (3) and is used to drive a cylinder connecting rod (4). The cylinder connecting rod (4) extends into the inner hole (31) and is connected to drive the expansion block push rod (5); and A welding slag protection cover plate (1) is detachably mounted on the top of the positioning pin body (3) to shield the inner hole (31) and the expansion block push rod (5); When assembling, the cylinder connecting rod (4) pushes the expansion block push rod (5) to extend, so that the expansion block (2) retracts radially inward along the slide groove (32), making it easier to install the round sleeve on the upper part of the positioning pin body (3); During clamping and positioning, the cylinder connecting rod (4) pulls the expansion block push rod (5) back, causing the expansion block (2) to expand outward along the radial direction of the slide groove (32), thereby expanding the circular sleeve.

2. The fixture expansion pin positioning device according to claim 1, characterized in that: An expanding block inclined surface (21) is provided on one side of the expanding block (2) that cooperates with the expanding block push rod (5), and a push rod inclined surface (52) is provided at a position on the expanding block push rod (5) that matches each expanding block inclined surface (21).

3. The fixture expansion pin positioning device according to claim 2, characterized in that: The center of the rising block inclined surface (21) extends outward to form a protrusion (22) with a "T"-shaped cross section. The center of each push rod inclined surface (52) is provided with a slot (51) with a "T"-shaped cross section for snapping into the protrusion (22) so that the rising block (2) slides relatively along the slot (51).

4. The fixture expansion pin positioning device according to claim 1, characterized in that: The expansion block push rod (5) is penetrated by a central hole (53) for installing a connecting screw (6), and the connecting screw (6) is fixed to the blind hole at the top of the cylinder connecting rod (4).

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