High-precision clamping jig

Abstract

The utility model discloses a high-precision clamping jig which comprises a fixing assembly, the fixing assembly is provided with a clamping cavity, the center portion of a workpiece to be installed is located in the clamping cavity, and the fixing assembly is provided with an annular cavity surrounding the clamping cavity and an airtight cover sliding up and down along the cavity wall of the annular cavity. The annular cavity is communicated with the clamping cavity through a plurality of communicating holes, and the airtight cover can clamp the central part of the to-be-mounted workpiece through the communicating holes; internal clamping directly acts on the central part of the workpiece to be assembled, so that clamping force can be transmitted more efficiently, and the common problem of force loss caused by external clamping is avoided; and more accurate control can be achieved through internal clamping, especially in a scene needing high-precision positioning, more stable clamping force can be provided through internal clamping, errors caused by torque offset or uneven force application possibly existing in external clamping are avoided, the precision of clamping the to-be-clamped workpiece is improved, and repeated clamping can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of clamping fixture, specifically a high accuracy clamping fixture. BACKGROUND

[0002] Clamping fixture is a tool used to fix and support workpieces during machining, assembly or inspection. Its main function is to ensure the precise positioning of workpieces during machining or inspection, to ensure machining accuracy, improve work efficiency and ensure safety. Clamping fixture can not only be used for single-piece production, but also be widely used in mass production to ensure the consistency of repetitive processing.

[0003] As disclosed in the patent document "CN118952076A", "a clamping fixture", the patent realizes the clamping state of the workpiece by gradually approaching the front clamping piece to the rear clamping piece, only focuses on the convenience of operation, but still realizes the positioning of the workpiece by extruding the workpiece from the outside, and the error caused by the torque deviation or uneven force of external clamping may occur, resulting in poor accuracy of the technical solution. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a high-precision clamping fixture to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A high-precision clamping fixture, comprising a fixed component, the fixed component is provided with a clamping cavity, the center part of the workpiece to be assembled is located in the clamping cavity, the fixed component is provided with an annular cavity around the clamping cavity and a gas-tight cover sliding up and down along the cavity wall of the annular cavity, the annular cavity and the clamping cavity are communicated through a plurality of communication holes, and the gas-tight cover can clamp the center part of the workpiece to be assembled through the communication holes.

[0007] Further technical scheme, the center part is provided with a clamping groove, the hole wall of the communication hole is provided with a ball, the outer wall of the ball is provided with a pushing groove on the gas-tight cover, the area of the groove bottom of the pushing groove is smaller than the area of the groove opening of the pushing groove, and the groove wall of the pushing groove can push the ball and the groove wall of the clamping groove to abut; the hole wall of the communication hole is provided with a step, and the step can be used to abut with the ball.

[0008] Further technical scheme, the gas-tight cover comprises a plurality of spring grooves, the spring grooves are fixedly provided with springs at the groove bottom, the other end of the spring is fixedly connected with the upper surface of the annular cavity, the fixed component is provided with an air inlet and an air outlet, the air inlet is communicated with the annular cavity through an air inlet pipeline, and the air outlet is communicated with the annular cavity through an air outlet pipeline.

[0009] Further technical solutions, the air-tight cover is provided with a guide groove, the bottom of the annular cavity is provided with a guide column, the guide column is vertically arranged, the guide column is fixedly connected with the fixing assembly, and the guide column is slidably connected with the guide groove.

[0010] Further technical solutions, the bottom end of the air-tight cover is provided with a sealing groove one and a sealing groove two, the sealing groove one and the sealing groove two are respectively provided with a sealing ring one and a sealing ring two, the sealing ring one abuts against the inner annular cavity wall of the annular cavity, and the sealing ring two abuts against the outer annular cavity wall of the annular cavity.

[0011] Further technical solutions, the fixing assembly is provided with a gas pushing port, the gas pushing port is communicated with the clamping cavity through a gas pushing pipeline, the cavity wall of the clamping cavity and the center part are provided with a gap, the gas pushing port can pass into gas to drive the movement of the ball, the center part is provided with a sealing groove three at the upper end, the cavity wall of the clamping cavity is provided with an inclined groove, and the sealing groove three and the inclined groove are provided with a sealing ring three.

[0012] Further technical solutions, the upper end of the fixing assembly is provided with a plurality of insertion grooves, the plurality of insertion grooves are annularly arranged, the fixing assembly is further provided with a plurality of clamping blocks, the to-be-assembled workpiece is detachably connected with the clamping blocks, and the clamping blocks can be clamped with the insertion grooves.

[0013] Further technical solutions, the to-be-assembled workpiece is provided with a threaded hole one, the surface of the clamping block facing the to-be-assembled workpiece is provided with a threaded hole two, and the threaded hole one and the threaded hole two can be inserted and connected through a screw.

[0014] Further technical solutions, the clamping block comprises two elastic portions and a fixed portion, the two elastic portions are located on the two sides of the fixed portion, and the elastic portion abuts against the groove wall of the insertion groove.

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

[0016] When the user needs to keep the to-be-assembled workpiece stable relative to the fixing assembly, the center part of the to-be-assembled workpiece can be clamped by the air-tight cover, so that the to-be-assembled workpiece is clamped from the inside, the inside clamping directly acts on the center part of the to-be-assembled workpiece, the clamping force can be more efficiently transmitted, and the force loss problem commonly existing in external clamping is avoided; and the inside clamping can realize more accurate control, especially in the scene requiring high-precision positioning, the inside clamping can provide more stable clamping force, and the error caused by the possible torque deviation or uneven force of external clamping is avoided.

[0017] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. DRAWINGS

[0018] Figure 1 : The utility model discloses a three-dimensional structure of the workpiece to be assembled Figure 1 .

[0019] Figure 2 : The utility model discloses a sectional view of the workpiece to be assembled.

[0020] Figure 3 : The utility model discloses Figure 2 A part enlarged view of the utility model.

[0021] Figure 4 : The utility model discloses the structure diagram of airtight cover.

[0022] Figure 5 : The utility model discloses the structure diagram of center part.

[0023] Figure 6 : The utility model discloses the sectional view of fixed assembly.

[0024] Figure 7 : The utility model discloses a three-dimensional structure of the workpiece to be assembled Figure 2 .

[0025] Figure 8 : The utility model discloses Figure 7 B part enlarged view of the utility model.

[0026] Reference Signs: 1, fixed assembly;11, clamping cavity;12, annular cavity;2, workpiece to be assembled;21, center part;211, pull rod one;212, pull rod two;213, cup head;22, movable supporting plate;23, magnetic platform;24, connecting block;3, airtight cover;4, communication hole;5, clamping groove;6, ball;7, push groove;8, step;9, spring groove;10, spring;13, air inlet;14, air outlet;15, sealing groove one;16, sealing groove two;17, sealing ring one;18, sealing ring two;19, non-circular protruding block;20, insertion slot;25, clamping block;251, elastic part;252, fixed part DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0028] Please refer to Figures 1-8 .

[0029] The utility model provides a high-precision clamping fixture, including fixed component 1, fixed component 1 is provided with clamping cavity 11, the center part 21 of the workpiece to be assembled is located clamping cavity 11, the annular cavity 12 of being provided with along the cavity wall of annular cavity 12 up and down sliding airtight cover 3 is set up on fixed component 1 around clamping cavity 11, the annular cavity 12 with clamping cavity 11 is communicated through a plurality of communication holes 4, the airtight cover 3 can be clamped the center part 21 of the workpiece to be assembled through communication hole 4.

[0030] Specifically, when the user needs to insert the workpiece to be assembled 2 into the clamping cavity 11, the center part 21 of the workpiece to be assembled 2 is located in the clamping cavity 11 of the fixed component 1, an annular cavity 12 is provided around the clamping cavity 11 on the fixed component 1, and an airtight cover 3 capable of sliding up and down along the cavity wall is installed in the annular cavity 12. The annular cavity 12 is connected with the clamping cavity 11 through a plurality of communication holes 4. The center part 21 of the workpiece to be assembled can be clamped by moving the airtight cover 3 up and down. If the user needs to keep the workpiece to be assembled stable relative to the fixed component 1, the center part 21 of the workpiece to be assembled can be clamped by the airtight cover 3, thereby achieving internal clamping of the workpiece to be assembled. Internal clamping directly acts on the center part 21 of the workpiece to be assembled, can more efficiently transmit the clamping force, and avoids the force loss problem commonly seen in external clamping. Moreover, internal clamping can achieve more precise control, especially in scenarios requiring high-precision positioning, internal clamping can provide more stable clamping force, avoiding errors caused by possible torque deviation or uneven force of external clamping. In addition, when the user needs to remove the workpiece to be assembled 2, the clamping of the workpiece to be assembled 2 can be released by the airtight cover 3, and then the workpiece to be assembled 2 can be removed.

[0031] Further, the center part 21 is provided with a clamping groove 5, the hole wall of the communication hole 4 is provided with a ball 6, the outer wall of the airtight cover 3 towards the ball 6 is provided with a pushing groove 7, the area of the groove bottom of the pushing groove 7 is smaller than the area of the groove mouth of the pushing groove 7, and the groove wall of the pushing groove 7 can push the ball 6 to abut against the groove wall of the clamping groove 5. The hole wall of the communication hole 4 is provided with a step 8, which can be used to abut against the ball 6.

[0032] Specifically, in the initial state, i.e. when the clamping cavity 11 is in an idle state, the air-tight cover 3 is in the lower position, the groove wall of the push groove 7 is in contact with the ball 6, and the ball 6 stays at the position of the step 8 of the communication hole 4 facing the annular cavity; when it is needed to clamp the workpiece 2 to be assembled, the central part of the workpiece 2 to be assembled is first inserted into the clamping cavity 11, and then the air-tight cover 3 is slid upward along the guide structure thereof, so that the lower groove wall of the push groove gradually approaches the ball 6; as the air-tight cover 3 moves upward, the groove wall of the push groove 7 is in contact with the ball 6; since the groove bottom area of the push groove 7 is smaller than the groove opening area, the groove wall has a certain inclination angle, so that when the push groove 7 is in contact with the ball 6, the groove wall will exert an inward force on the ball 6, forcing the ball 6 to move along the hole wall of the communication hole 4 to the clamping cavity; as the air-tight cover 3 further moves upward, the groove wall of the push groove 7 continuously exerts pressure on the ball 6, pushing the ball 6 to abut against the step 8; at this time, the ball 6 abuts against the clamping groove 5 of the central part 21, forming a reliable mechanical clamping; the contact surface of the ball 6 provides a highly concentrated clamping force, which directly acts on the central part 21, so that the workpiece to be assembled is firmly fixed at the current position; when it is needed to release the clamping, the air-tight cover 3 is slid downward along the guide structure, gradually moving away from the ball 6; as the air-tight cover 3 moves downward, the groove wall of the push groove 7 no longer exerts force on the ball 6; at this time, the ball 6 does not exert pressure on the clamping groove 5, i.e. the clamping force is completely released, and the workpiece to be assembled returns to a free state and can be taken out from the fixing assembly 1; the direct contact of the ball 6 with the clamping groove 5 provides a highly concentrated clamping force, making the clamping process more efficient and reliable.

[0033] In some embodiments, the air-tight cover 3 comprises a plurality of spring grooves 9, the spring grooves 9 are fixedly provided with springs 10 at the groove bottom, the other end of the spring 10 is fixedly connected with the upper surface of the annular cavity 12, the fixing assembly 1 is provided with an air inlet 13 and an air outlet 14, the air inlet 13 is communicated with the annular cavity 12 through an air inlet pipeline, and the air outlet 14 is communicated with the annular cavity 12 through an air outlet pipeline; further, the air-tight cover 3 is provided with a guide groove, the cavity bottom of the annular cavity 12 is provided with a guide column, the guide column is vertically arranged, the guide column is fixedly connected with the fixing assembly 1, and the guide column is in sliding connection with the guide groove; the bottom end of the air-tight cover 3 is provided with a sealing groove one 15 and a sealing groove two 16, the sealing groove one 15 and the sealing groove two 16 are respectively provided with a sealing ring one 17 and a sealing ring two 18, the sealing ring one 17 abuts against the inner annular cavity wall of the annular cavity 12, and the sealing ring two 18 abuts against the outer annular cavity wall of the annular cavity 12.

[0034] Specifically, in the initial state, the annular cavity 12 is at normal pressure, the spring 10 is in a natural stretched state, pushing the airtight cover 3 downward to keep it in the bottom position, and the pushing groove 7 of the airtight cover 3 is in contact with the ball 6. When it is needed to insert the workpiece 2 to be installed into the clamping cavity for clamping, gas is introduced into the annular cavity 12 through the gas inlet 13. As the gas enters the annular cavity 12, the gas pressure in the cavity gradually increases, the lower surface of the airtight cover 3 is subjected to the pressure of the gas, overcomes the elastic restoring force of the spring 10 and gradually moves upward. In the moving process, the airtight cover 3 is slidably connected with the guide column through the guide groove, ensuring that the movement is stable and vertical and cannot be inclined or stuck. As the airtight cover 3 slides upward, the groove wall of the pushing groove 7 gradually moves away from the ball 6, the ball 6 is in contact with the clamping groove 5 of the center part 21, the ball 6 applies a clamping force to the center part 21, and the workpiece to be installed is stably placed on the fixed assembly 1.

[0035] In some embodiments, the center part 21 includes a pull rod one 211, a pull rod two 212 and a cup head 213. The pull rod one 211 is internally provided with a through shaft cylinder, the through shaft cylinder is sleeved on the outer surface of the cup head 213, the bottom end of the pull rod one 211 is provided with a movable groove, the pull rod two 212 is sleeved on the movable groove of the pull rod one 211, and the outer wall of the pull rod two 212 away from the movable groove is inclinedly arranged. The inclined outer wall of the pull rod two 212 can abut against the ball 6. Further, the fixed assembly 1 is provided with a gas pushing port, the cavity wall of the clamping cavity and the center part are provided with a gap, the gas pushing port can introduce gas to push the ball to move, the upper end of the pull rod one 211 is provided with a sealing groove three, the cavity wall of the clamping cavity 11 is provided with an inclined groove, and the sealing groove three and the inclined groove are provided with a sealing ring three.

[0036] Specifically, the present embodiment provides another way to remove the clamping. When the gas in the annular cavity 12 is discharged and the spring 10 naturally stretches, the gas is pushed through the gas pushing port, the ball 6 is pushed away from the clamping groove 5 through the gap by the gas, and the center part 21 can be conveniently pulled out by the operator.

[0037] The workpiece to be installed includes an active supporting plate 22, a magnetic table 23 and a connecting block 24. The active supporting plate 22 and the magnetic table 23 are detachably fixedly connected, and the connecting block 24 and the magnetic table 23 are detachably fixedly connected. The upper end of the pull rod one 211 includes a non-circular protrusion 19. The active supporting plate 22 is provided with a cylindrical one and a non-circular cylindrical two. The cylindrical one and the non-circular cylindrical two are communicated. The cylindrical one is inserted with the cup head 213, and the non-circular cylindrical two is clamped with the non-circular protrusion 19.

[0038] Specifically, through the clamping of the non-circular cylindrical two and the non-circular protrusion 19, the active supporting plate 22 can be relatively fixed with the pull rod one 211.

[0039] In some embodiments, the fixed assembly 1 is provided with a plurality of slots 20 at the upper end, the slots 20 are annularly arranged, the movable supporting plate 22 is provided with a plurality of clamping blocks 25, the movable supporting plate 22 is detachably connected with the clamping blocks 25, and the clamping blocks 25 are clamped with the slots 20; the movable supporting plate 22 is provided with a threaded hole one, the surface of the clamping block 25 facing the movable supporting plate 22 is provided with a threaded hole two, and the threaded hole one and the threaded hole two are inserted and connected through screws; further, the clamping block 25 comprises two elastic portions 251 and a fixed portion 252, the two elastic portions 251 are located on both sides of the fixed portion 252, the elastic portion 251 abuts against the slot wall of the slot 20, in the embodiment, the number of clamping blocks 25 is four, the four clamping blocks are annularly arranged in the slot 20, and the gap between the clamping block 25 and the slot 20 is less than 0.01mm through the extrusion of the elastic portion 251 and the slot 20.

[0040] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A high-precision clamping fixture, characterized in that, The device includes a fixing component (1), which has a clamping cavity (11). The center part (21) of the workpiece (2) to be installed is located in the clamping cavity (11). The fixing component (1) has an annular cavity (12) surrounding the clamping cavity (11) and an airtight cover (3) that slides up and down along the cavity wall of the annular cavity (12). The annular cavity (12) and the clamping cavity (11) are connected through a plurality of connecting holes (4). The airtight cover (3) can clamp the center part (21) of the workpiece (2) to be installed through the connecting holes (4).

2. The high-precision clamping fixture according to claim 1, characterized in that, The central part (21) is provided with a clamping groove (5), the wall of the connecting hole (4) is provided with a ball (6), the outer wall of the airtight cover (3) facing the ball (6) is provided with a pushing groove (7), the area of ​​the bottom of the pushing groove (7) is smaller than the area of ​​the opening of the pushing groove (7), and the wall of the pushing groove (7) can push the ball (6) to abut against the wall of the clamping groove (5); the wall of the connecting hole (4) is provided with a step (8), and the step (8) can be used to abut against the ball (6).

3. The high-precision clamping fixture according to claim 1, characterized in that, The airtight cover (3) includes several spring grooves (9), and a spring (10) is fixedly installed at the bottom of the spring groove (9). The other end of the spring (10) is fixedly connected to the upper surface of the annular cavity (12). The fixing assembly (1) is provided with an air inlet (13) and an air outlet (14). The air inlet (13) is connected to the annular cavity (12) through an air inlet pipe, and the air outlet (14) is connected to the annular cavity (12) through an air outlet pipe.

4. A high-precision clamping fixture according to claim 1, characterized in that, The airtight cover (3) is provided with a guide groove, and the bottom of the annular cavity (12) is provided with a guide post. The guide post is vertically arranged and is fixedly connected to the fixing component (1). The guide post is slidably connected to the guide groove.

5. A high-precision clamping fixture according to claim 1, characterized in that, The bottom end of the airtight cover (3) is provided with a sealing groove 1 (15) and a sealing groove 2 (16). A sealing ring 1 (17) and a sealing ring 2 (18) are respectively provided in the sealing groove 1 (15) and the sealing groove 2 (16). The sealing ring 1 (17) abuts against the inner ring wall of the annular cavity (12), and the sealing ring 2 (18) abuts against the outer ring wall of the annular cavity (12).

6. A high-precision clamping fixture according to claim 2, characterized in that, The fixing component (1) is provided with an air push port, which is connected to the clamping cavity (11) through an air push pipe. The cavity wall of the clamping cavity (11) and the center part (21) are provided with a gap. Gas can be introduced into the air push port to push the ball (6) to move. A sealing groove three is provided at the upper end of the center part (21). An inclined groove is opened in the cavity wall of the clamping cavity (11). A sealing ring three is provided in the sealing groove three and the inclined groove.

7. A high-precision clamping fixture according to claim 6, characterized in that, The upper end of the fixing component (1) is provided with a plurality of slots (20), which are arranged in a ring. The fixing component (1) is also provided with a plurality of locking blocks (25). The workpiece (2) to be installed is detachably connected to the locking blocks (25), and the locking blocks (25) can engage with the slots (20).

8. A high-precision clamping fixture according to claim 7, characterized in that, The workpiece (2) to be installed is provided with a threaded hole one, and the card block (25) is provided with a threaded hole two on the surface of the workpiece (2) to be installed. The threaded hole one and the threaded hole two can be connected by screws.

9. A high-precision clamping fixture according to claim 8, characterized in that, The card block (25) includes two elastic parts (251) and a fixing part (252). The two elastic parts (251) are located on both sides of the fixing part (252), and the elastic parts (251) abut against the groove wall of the slot (20).

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