Self-centering positioning clamp

Abstract

A base is fixedly arranged at the upper end of a clamp body, clamping jaws opposite in position are arranged on the periphery of the base, clamping blocks are fixedly arranged at the upper ends of the clamping jaws, the lower ends of the clamping jaws are fixedly connected with one end of a sliding rod, racks are arranged at one end of the sliding rod, and the racks are meshed on a gear shaft at intervals. The sliding rods are in sliding connection with the inner side of the clamp body, the other end of one sliding rod is in transmission connection with an air cylinder piston, and the tail end of the air cylinder piston is in sealing connection with the clamp body through a sealing bottom cover. A sealing ring and a positioning sleeve are sequentially arranged between the sliding rod and the clamp body from inside to outside, and the sliding rod is connected with the inner side of the clamp body in a sealed and sliding mode. Gear and rack transmission is adopted, the power transmission direction is single, the internal resistance of the clamp is reduced, the structure is more stable, and the appearance is reduced so that the clamp can be used in various environments and machines of various sizes.

Description

Technical Field

[0001] This utility model relates to the field of clamping device technology, and in particular to a self-centering positioning clamp. Background Technology

[0002] In the machining industry, self-centering positioning fixtures are required. However, existing self-centering positioning fixtures cannot completely isolate their internal moving parts from the outside environment. During machining, liquids, dust, and other contaminants can penetrate into the fixture, increasing the frictional resistance between the internal moving parts, affecting operating accuracy, and even causing jamming. In severe cases, this can lead to equipment collisions and significant losses. Therefore, it is necessary to improve self-centering positioning fixtures so that the internal moving parts are completely isolated and unaffected by external liquids, dust, etc., thereby improving the performance stability and service life of the self-centering positioning fixtures. Utility Model Content

[0003] The purpose of this invention is to provide a self-centering positioning fixture that effectively solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution.

[0005] A self-centering positioning fixture includes a fixture body, a base, grippers, clamping blocks, a slide rod, a rack, a gear shaft, and a cylinder piston. The upper end of the fixture body is fixedly provided with a base, and grippers with opposite positions are respectively provided around the base. The upper end of each gripper is fixedly provided with a clamping block, and the lower end is fixedly connected to one end of the slide rod. One end of the slide rod is provided with a rack, and the racks are respectively meshed with the gear shaft at intervals. The slide rod is slidably connected to the inner side of the fixture body, and the other end of one of the slide rods is drivenly connected to the cylinder piston. The end of the cylinder piston is sealed to the fixture body through a sealing bottom cover.

[0006] Preferably, a sealing ring and a positioning sleeve are sequentially provided between the slide rod and the clamp body from the inside out, and the slide rod is slidably connected to the inner side of the clamp body in a sealed manner.

[0007] Preferably, the slide bar is arranged obliquely within the clamp body, and the lower surface of the clamping block is lower than the upper surface of the base.

[0008] Preferably, the cylinder piston has an A port connected to its outer side, and a B port is provided at the connection between the cylinder piston and the slide rod, with the B port extending out from the bottom of the clamp body.

[0009] Preferably, the base is provided with an air intake hole, which is connected to an external vacuum device.

[0010] Preferably, the slide bar and the rack are positioned and connected by a locating pin.

[0011] Preferably, the clamp body has a transmission cavity in the middle, and the upper and lower ends of the gear shaft are movably connected to the transmission cavity through movable bearings.

[0012] Preferably, an adapter plate is fixedly provided on one side of the fixture body, and a sensor is installed on the adapter plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) This utility model has a base fixed to the upper end of the fixture body, and grippers with opposite positions are provided around the base. The upper end of each gripper is fixed with a clamping block, and the lower end is fixedly connected to one end of a slide rod. One end of the slide rod is provided with a rack, and the racks are respectively meshed with gear shafts at intervals. The slide rod is slidably connected to the inner side of the fixture body, and the other end of one of the slide rods is connected to a cylinder piston. The end of the cylinder piston is sealed to the fixture body through a sealing bottom cover. This utility model adopts gear and rack transmission, which has a single power transmission direction, reduces the internal resistance of the fixture, makes the structure more stable, and reduces the size to meet the needs of various environments and machine tools of various sizes.

[0015] (2) When compressed air enters from the air port B, it pushes the cylinder piston backward, which drives the slide rod and clamping block to clamp the workpiece so that the top of the workpiece can be processed. When compressed air enters from the air port A, it pushes the cylinder piston forward, and at the same time, the suction hole draws out air to create a vacuum state to hold the workpiece so that the workpiece can be processed around. The gear rack can drive the four slide rods and clamping blocks to clamp or release at the same time. The structure is simple and the positioning is efficient.

[0016] (3) The slide bar of this utility model is set obliquely inside the fixture body, and the lower surface of the clamping block is lower than the upper surface of the base, so that the clamping block can be lower than the workpiece, thereby not limiting the size of the subsequent tool to process the workpiece around. At the same time, a sealing ring is set between the fixture body and the slide bar to prevent liquid and dust from entering the interior of the body during the workpiece processing, thereby improving the performance stability and service life of the fixture of this utility model. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a longitudinal sectional view of the clamped state of this utility model;

[0019] Figure 3 This is a cross-sectional view of the present invention. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] like Figures 1 to 3 As shown, a self-centering positioning fixture includes a fixture body 1, a base 2, grippers 3, clamping blocks 4, a slide bar 5, a rack 6, a gear shaft 7, a cylinder piston 8, a sealing bottom cover 9, a sealing ring 10, a positioning sleeve 11, an A-port 12, a B-port 13, an air intake hole 14, a positioning pin 15, a transmission cavity 16, an adapter plate 17, a sensor 18, and a workpiece 19.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figures 1 to 3 As shown, a base 2 is fixedly mounted on the upper end of the fixture body 1. Grippers 3 are positioned opposite each other around the base 2. A clamping block 4 is fixedly mounted on the upper end of each gripper 3, and its lower end is fixedly connected to one end of a slide rod 5. A rack 6 is mounted on one end of the slide rod 5, and the racks 6 are interleaved with gear shafts 7 at intervals. The slide rods 5 are slidably connected to the inner side of the fixture body 1. The other end of one slide rod 5 is connected to a cylinder piston 8. The end of the cylinder piston 8 is sealed to the fixture body 1 through a sealing bottom cover 9. This utility model uses a gear and rack 6 transmission, resulting in a single power transmission direction, reduced internal resistance of the fixture, a more stable structure, and a smaller size to meet the needs of various environments and machine tools of various sizes.

[0025] A sealing ring 10 and a positioning sleeve 11 are sequentially arranged from the inside to the outside between the slide rod 5 and the fixture body 1, forming a sealed sliding connection between the slide rod 5 and the inner side of the fixture body 1. The positioning sleeve 11 ensures the accuracy of repeatable movement, and the sealing ring 10 seals the space between the slide rod 5 and the fixture body 1, serving a sealing and blocking function to prevent liquids and dust from entering the interior of the fixture body 1 during the processing of the workpiece 19.

[0026] The slide bar 5 is obliquely arranged inside the fixture body 1, and the lower surface of the clamping block 4 is lower than the upper surface of the base 2, so that the clamping block 4 can be lower than the workpiece 19, thereby allowing the workpiece 19 to be machined around its perimeter without being limited by the size of the subsequent cutting tool. At the same time, a sealing ring 10 is provided between the fixture body 1 and the slide bar 5 to prevent liquids and dust from entering the interior of the body during the machining of the workpiece 19, thereby improving the performance stability and service life of the fixture of this utility model.

[0027] The cylinder piston 8 has an A port 12 connected to its outer side, and a B port 13 is provided at the connection between the cylinder piston 8 and the slide rod 5, extending out from the bottom of the fixture body 1. An air intake hole 14 is provided on the base 2, which is connected to an external vacuum device. When compressed air enters through port B, it pushes the cylinder piston 8 backward, causing the slide rod 5 and clamping block 4 to clamp the workpiece 19, thus machining the top of the workpiece 19. When compressed air enters through port A, it pushes the cylinder piston 8 forward, while the air intake hole 14 extracts air to create a vacuum that holds the workpiece 19 in place, allowing machining of the workpiece 19's circumference. The gear rack 6 can simultaneously clamp or release the four slide rods 5 and clamping blocks 4. The structure is simple and provides efficient positioning.

[0028] The slide bar 5 and the rack 6 are positioned and connected by a locating pin 15, so that the rack 6 and the gear shaft 7 keep in the same position to ensure synchronization.

[0029] The main body 1 of the fixture has a transmission cavity 16 in the middle. The upper and lower ends of the gear shaft 7 are connected to the transmission cavity 16 by movable bearings (not shown in the attached figure), which are common movable bearings on the market.

[0030] An adapter plate 17 is fixedly provided on one side of the fixture body 1. A sensor 18 is installed on the adapter plate 17. The sensor 18 is used to sense whether the gripper 3 is working properly.

[0031] The working principle of this utility model is as follows: By introducing air pressure into air port A 12, the air pressure pushes the cylinder piston 8 forward. After the cylinder piston 8 moves forward, the four grippers 3 move towards the center of the self-centering fixture, clamping the workpiece 19. The self-centering fixture is in a clamped state. The workpiece 19 is sucked in through the vacuum suction hole 14. Air pressure is introduced into air port B 13. The cylinder piston 8 drives the slide rod 5 to move outward. The rack 6 on the slide rod 5 drives the four slide rods 5 and the four grippers 3 to move outward simultaneously through the gear shaft 7, so that the clamping block 4 is released. The whole is in a released state. The machining tools on the machine tool can process the front and side of the workpiece 19. After processing, the vacuum suction is canceled through the vacuum suction hole 14 to release the workpiece 19.

[0032] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of this utility model. Therefore, any modifications, equivalent changes, or improvements made in accordance with the claims of this utility model shall still fall within the scope of this utility model.

Claims

1. A self-centering positioning fixture, characterized by: Including clamp body (1), base (2), clamp jaw (3), clamp block (4), slide rod (5), rack (6), gear shaft (7) and cylinder piston (8), the clamp body (1) upper end is fixedly provided with base (2), the base (2) is respectively provided with opposite clamp jaw (3) around, the clamp jaw (3) upper end is fixedly provided with clamp block (4), and lower end is fixedly connected with one end of slide rod (5), one end of slide rod (5) is provided with rack (6), and the rack (6) is respectively engaged on gear shaft (7) with interval;The slide rod (5) is slidably connected with the inner side of the clamp body (1), and the other end of one of the slide rod (5) is drivingly connected with the cylinder piston (8), and the cylinder piston (8) is sealingly connected with the clamp body (1) through sealing bottom cover (9).

2. A self-centering positioning fixture according to claim 1, characterized in that: Sealing ring (10) and positioning sleeve (11) are sequentially arranged from inside to outside between the slide rod (5) and the clamp body (1), and the slide rod (5) is sealingly and slidably connected with the inner side of the clamp body (1).

3. A self-centering positioning fixture according to claim 2, characterized in that: The slide rod (5) is obliquely arranged in the clamp body (1), and the lower surface of the clamp block (4) is lower than the upper surface of the base (2).

4. A self-centering positioning fixture according to claim 3, characterized in that: The outer side of the cylinder piston (8) is communicated with A gas port (12), and the connection part of the cylinder piston (8) and the slide rod (5) is provided with B gas port (13), and the B gas port (13) extends out of the bottom of the clamp body (1).

5. A self-centering positioning fixture according to claim 3, characterized in that: The base (2) is provided with suction hole (14), and the suction hole (14) is communicated with external vacuum equipment.

6. A self-centering positioning fixture according to claim 4, characterized in that: The slide rod (5) and the rack (6) are positioned and connected through positioning pin (15).

7. A self-centering positioning fixture according to claim 1, characterized in that: The middle part of the clamp body (1) is provided with transmission cavity (16), and the upper and lower ends of the gear shaft (7) are movably connected with the transmission cavity (16) through movable bearing.

8. A self-centering positioning fixture according to claim 7, characterized in that: The clamp body (1) is fixedly provided with adapter plate (17) on one side, and the adapter plate (17) is provided with inductor (18).

Images