Positioning and clamping device

Abstract

The utility model relates to the technical field of positioning and clamping devices, and provides a positioning and clamping device which comprises a fixing part, a clamping part and a clamping part. The fixing part can be switched between a contraction state and an expansion state. The driving shaft is movably arranged on the side of the fixing part, and the axis of the driving shaft and the axis of the fixing part are collinear; the at least two positioning columns are in transmission connection with the driving shaft, the axes of the at least two positioning columns are arranged in parallel and located on the same plane, and the middle positions of the axes of the at least two positioning columns are collinear with the axis of the driving shaft. The utility model has the advantages that the driving shaft drives the positioning column to move, so that the positioning column is propped against the hole site of the workpiece, the position of the workpiece is corrected, and the axis of the workpiece is aligned with the axis of the fixed part. The fixing piece expands and fixes the workpiece, and the situation that the axis of the workpiece is not aligned with the axis of the positioning device, and the accuracy of the machining size is affected is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to positioning clamping device technical field, specifically is a positioning clamping device. BACKGROUND

[0002] In lathe processing, in order to ensure the stability and precision of workpiece in the processing process, positioning clamping device is needed to fix workpiece. The existing lathe usually takes three jaw chuck as positioning clamping device. Three jaw chuck is a commonly used machine tool fixture, mainly used for fixing circular or approximately circular workpiece. Through the synchronous movement of three evenly distributed claws, three jaw chuck can firmly hold workpiece, ensure the stability and precision of workpiece in the processing process. But when the workpiece clamped by three jaw chuck is too long, the overhanging length of workpiece will increase, which may cause the axis of the end of workpiece away from three jaw chuck not to be collinear with the axis of three jaw chuck. This will cause the workpiece to shake when three jaw chuck drives workpiece to rotate in the lathe processing process, so that the relative position of tool and workpiece changes, resulting in inaccurate processing size. SUMMARY

[0003] The utility model provides a positioning clamping device for the present situation of prior art.

[0004] The utility model discloses the technical scheme that adopts to solve the above-mentioned technical problem is: propose a kind of positioning clamping device, for positioning workpiece, workpiece is equipped with at least two finish machining hole position, comprising:

[0005] Fixing piece, for fixing the workpiece, the fixing piece can be switched between the contraction state and the inflation state, when the fixing piece is in the contraction state, the workpiece is set on the outside of the fixing piece, when the fixing piece is in the inflation state, for fixing the workpiece;

[0006] Driving shaft, the driving shaft is movably arranged in the side of the fixing piece, the axis of the driving shaft is collinear with the axis of the fixing piece;

[0007] At least two positioning columns, at least two positioning columns are drivingly connected with the driving shaft, the positioning column is one-to-one corresponding with the hole position and movably abuts, the axis of at least two positioning columns is parallelly arranged and located on the same plane, and the middle position of the axis of at least two positioning columns is collinear with the axis of the driving shaft.

[0008] In the above-mentioned positioning clamping device, the driving shaft is provided with a threaded hole, one end of the driving shaft is connected with a connecting plate, the connecting plate is provided with a bolt through hole, a bolt passes through the bolt through hole and is connected on the driving piece, for fixing the connecting plate on the driving shaft, at least two positioning columns are connected on the connecting plate.

[0009] In the positioning and clamping device, the connecting plate is provided with a stepped hole corresponding to the positioning column, the stepped hole is provided with a first end and a second end, the second end is threadedly connected with a screw, the positioning column is provided with a column body and a limiting portion, the column body is inserted into the first end, the limiting portion abuts against the inner wall of the second end, and an end of the limiting portion away from the column body abuts against the screw.

[0010] In the positioning and clamping device, the at least two positioning columns are provided with a guide portion, the guide portion movably abuts against the hole position, and the guide portion is used for guiding the movement of the workpiece.

[0011] In the positioning and clamping device, the fixing member is provided with a channel, a moving rod is movably inserted into the channel, the moving rod can move between a first position and a second position, when the moving rod is in the first position, the fixing member is in a contracted state, and when the moving rod is in the second position, the fixing member is in an expanded state.

[0012] In the positioning and clamping device, the fixing member comprises:

[0013] a main body;

[0014] a tension sleeve, the tension sleeve is sleeved outside the main body, the tension sleeve comprises a plurality of tension blocks arranged in a ring shape, and every two adjacent tension blocks are connected through a rubber block;

[0015] a moving disc, the moving disc is connected with the moving rod, and the moving disc movably abuts against the tension sleeve.

[0016] In the positioning and clamping device, the main body is provided with a first inclined surface, the tension block is provided with a second inclined surface, the first inclined surface movably abuts against the second inclined surface, and when the moving disc moves towards the main body, the first inclined surface drives the tension sleeve to expand.

[0017] In the positioning and clamping device, the fixing member is provided with a limiting block, the limiting block movably abuts against the end of the tension block, and the limiting block is used for limiting the tension block.

[0018] Compared with the prior art, the positioning and clamping device has the advantages that the positioning column is driven to move by the driving shaft, the positioning column abuts against the hole position of the workpiece, the position of the workpiece is corrected, the axis of the workpiece is aligned with the axis of the fixing member, the fixing member expands and fixes the workpiece, the axis of the workpiece is prevented from being misaligned with the axis of the positioning and clamping device, and the accuracy of the machining size is affected. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of the positioning and clamping device;

[0020] Figure 2 is a sectional view of the positioning and clamping device of the utility model;

[0021] Figure 3 is a plan view of the fixing part of the utility model;

[0022] Figure 4 is a sectional view of the main body of the utility model;

[0023] Figure 5 is a sectional view of the connecting plate of the utility model.

[0024] In the figure, 1, fixing part;11, channel;12, moving rod;13, main body;131, first inclined surface;14, expansion sleeve;141, expansion block;142, rubber block;143, second inclined surface;15, moving disc;16, limit block;2, drive shaft;21, threaded hole;3, positioning column;31, column body;32, limiting part;33, guide part;4, connecting plate;41, bolt through hole;42, stepped hole;421, first end part;422, second end part;5, screw. DETAILED DESCRIPTION

[0025] The following is a specific embodiment of the utility model and in combination with the drawings, the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0026] As Figures 1 to 5 shown, the positioning and clamping device of the utility model is used for positioning workpiece, and the workpiece is provided with at least two fine machining hole positions, comprising:

[0027] Fixing part 1 is used for fixing workpiece, and fixing part 1 can be switched between the contraction state and the expansion state, when fixing part 1 is in the contraction state, the workpiece is sleeved on the outside of fixing part 1, and fixing part 1 is in the expansion state for fixing workpiece;Drive shaft 2 is movably arranged on the side of fixing part 1, and the axis of drive shaft 2 is collinear with the axis of fixing part 1;At least two positioning columns 3 are in driving connection with drive shaft 2, positioning column 3 is in one-to-one correspondence with hole position and movably abuts against, the axis of at least two positioning columns 3 is parallelly arranged and located on the same plane, and the middle position of the axis of at least two positioning columns 3 is collinear with the axis of drive shaft 2.

[0028] The fixing piece 1 is arranged on the lathe, the driving shaft 2 is connected with the driving device of the lathe, and the driving device is used for driving the driving shaft 2 to move. The worker first sets the workpiece on the fixing piece 1, at this time, the axis of the workpiece and the axis of the fixing piece 1 may not be collinear. The driving device drives the driving shaft 2 to move, the driving shaft 2 drives at least two positioning columns 3 to move, the positioning columns 3 abut against the respective corresponding hole positions, and the workpiece is pushed. Since the hole position is a precisely machined hole position, the position and size are relatively accurate, the hole position and the positioning column 3 abut against each other to drive and correct the workpiece, so that the axis of the workpiece is aligned with the axis of the fixing piece 1. After the axis is aligned, the fixing piece 1 expands and fixes the workpiece, avoiding the case that the axis of the workpiece is not aligned with the axis of the positioning and clamping device, affecting the accuracy of the machining size.

[0029] The driving shaft 2 is provided with a threaded hole 21, one end of the driving shaft 2 is connected with a connecting plate 4, the connecting plate 4 is provided with a bolt through hole 41, a bolt passes through the bolt through hole 41 and is connected with a driving piece, which is used for fixing the connecting plate 4 on the driving shaft 2, and at least two positioning columns 3 are connected with the connecting plate 4.

[0030] The bolt passes through the bolt through hole 41 and is connected with the driving shaft 2, so that the connecting plate 4 is fixed on the driving shaft 2, and the connecting plate 4 is connected with the at least two positioning columns 3. The driving shaft 2 drives the connecting plate 4 to move, the connecting plate 4 drives the at least two positioning columns 3 to move, the positioning columns 3 abut against the respective corresponding hole positions, and the workpiece is pushed, so that the position of the workpiece is corrected, and the axis of the workpiece is aligned with the axis of the fixing piece 1.

[0031] The connecting plate 4 is provided with a stepped hole 42 corresponding to the positioning column 3 in one-to-one correspondence, the stepped hole 42 is provided with a first end portion 421 and a second end portion 422, the second end portion 422 is threadedly connected with a screw 5, the positioning column 3 is provided with a column body 31 and a limiting portion 32, the column body 31 is inserted on the first end portion 421, the limiting portion 32 is tightly abutted against the inner wall of the second end portion 422, and one end of the limiting portion 32 away from the column body 31 abuts against the screw 5.

[0032] One end of the limiting portion 32 abuts against the inner wall of the second end portion 422, and one end of the limiting portion 32 away from the column body 31 is tightly abutted against the screw 5, so that the positioning column 3 is fixed on the moving plate. In this way, when the positioning column 3 abuts against the corresponding hole position and pushes the workpiece, the positioning column 3 will not move relative to the moving plate, ensuring that the positioning column 3 can stably correct the workpiece, so that the axis of the workpiece is aligned with the axis of the fixing piece 1.

[0033] The at least two positioning columns 3 are provided with a guide portion 33, the guide portion 33 is movably abutted against the hole position, and the guide portion 33 is used for guiding the movement of the workpiece.

[0034] When the worker sets the workpiece on the fixing part 1, the axis of the workpiece can not be collinear with the axis of the fixing seat. When the positioning column 3 moves towards the direction of the corresponding hole position, the guide part 33 abuts against the corresponding hole position and pushes the workpiece to move. During the movement of the workpiece, the guide part 33 guides the movement of the workpiece and corrects the position of the workpiece relative to the fixing part 1, so that the axis of the workpiece is aligned with the axis of the fixing part 1.

[0035] The fixing part 1 of the scheme is provided with a channel 11, and a moving rod 12 is movably inserted in the channel 11. The moving rod 12 can move between a first position and a second position. When the moving rod 12 is in the first position, the fixing part 1 is in a contracted state. When the moving rod 12 is in the second position, the fixing part 1 is in an expanded state.

[0036] The lathe is provided with a moving device, and the moving device is connected with the moving rod 12. The moving device can drive the moving rod 12 to move. Referring to Figure 2 At this time, the moving rod 12 is located in the second position, and the fixing part 1 is in the expanded state. When the moving device drives the moving rod 12 to move along the direction from left to right of Figure 2 , the moving rod 12 moves from the second position to the first position, so that the fixing part 1 is in the contracted state. At this time, the worker can set the workpiece on the fixing part 1. Similarly, when the moving rod 12 is located in the first position (not shown in the figure), when the moving device drives the moving rod 12 to move along the direction from right to left of Figure 2 , the moving rod 12 moves from the first position to the second position, so that the fixing part 1 is in the expanded state, thereby fixing the workpiece.

[0037] The fixing part 1 of the scheme comprises a main body 13, a tension sleeve 14, the tension sleeve 14 being sleeved outside the main body 13, the tension sleeve 14 comprising a plurality of tension blocks 141 arranged in a ring shape, and every two adjacent tension blocks 141 being connected through a rubber block 142, a moving disc 15, the moving disc 15 being connected with the moving rod 12, the moving disc 15 being movably abutted against the tension sleeve 14, the main body 13 being provided with a first inclined surface 131, the tension block 141 being provided with a second inclined surface 143, the first inclined surface 131 and the second inclined surface 143 being movably abutted against each other, and being used for driving the tension sleeve 14 to expand when the moving disc 15 moves towards the main body 13.

[0038] As Figure 2As shown, at this time, the shift rod 12 is located in the second position, and the rubber block 142 is in the expanded state. When the shift rod 12 drives the moving disc 15 to move away from the main body 13, the rubber block 142 will shrink under the action of its elasticity, and drive the expansion block 141 to move, so that the first inclined surface 131 abuts against the second inclined surface 143. At this time, the expansion sleeve 14 is in the contracted state, and the worker can set the workpiece on the fixing part 1. After the workpiece is set, the shift rod 12 moves to drive the moving disc 15 to move towards the main body 13, and the moving disc 15 abuts against the expansion sleeve 14. The moving disc 15 exerts a pushing force on the rubber block 142, and the rubber block 142 is elastically deformed under the action of the pushing force, so as to abut against the inner wall of the workpiece. The rubber block 142 drives the expansion block 141 to move, and the end of the expansion block 141 is separated from the main body 13 and abuts against the inner wall of the workpiece, so as to fix the workpiece on the fixing part 1.

[0039] The fixing part 1 is provided with a limiting block 16, which movably abuts against the end of the expansion block 141, and is used for limiting the expansion block 141.

[0040] The shift rod 12 moves to drive the moving disc 15 to move towards the main body 13, and the moving disc 15 abuts against the expansion sleeve 14. The moving disc 15 exerts a pushing force on the rubber block 142, and the rubber block 142 is elastically deformed under the action of the pushing force, so as to abut against the inner wall of the workpiece. The rubber block 142 drives the expansion block 141 to move, and the end of the expansion block 141 is separated from the main body 13 and abuts against the inner wall of the workpiece. When the end of the expansion block 141 abuts against the inner wall of the workpiece, the end of the expansion block 141 abuts against the limiting block 16, and the limiting block 16 limits the end of the expansion block 141, so as to prevent the end of the expansion block 141 from moving too far, so that the rubber block 142 cannot drive the expansion block 141 to reset when the rubber block 142 shrinks, so that the fixing part 1 cannot return to the contracted state, and the fixing part 1 is disabled.

[0041] The driving shaft 2 is arranged to drive the positioning column 3 to move, so that the positioning column 3 abuts against the hole of the workpiece, thereby correcting the position of the workpiece, and aligning the axis of the workpiece with the axis of the fixing part 1. The fixing part 1 expands and fixes the workpiece, so as to avoid that the axis of the workpiece is not aligned with the axis of the positioning and clamping device, and affects the accuracy of the machining size.

[0042] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0043] In addition, the descriptions such as "first", "second", "one", etc. in the present application are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0044] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of the present application.

[0046] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the scope defined by the spirit of the present application.

Claims

1. A positioning and clamping device, characterized in that A positioning device for positioning a workpiece, the workpiece having at least two fine machining hole positions, comprising: a fixing member for fixing the workpiece, the fixing member being switchable between a contracted state and an expanded state, the workpiece being sleeved on the outside of the fixing member when the fixing member is in the contracted state, the fixing member being used for fixing the workpiece when the fixing member is in the expanded state; a drive shaft movably arranged on the side of the fixing member, the axis of the drive shaft being collinear with the axis of the fixing member; at least two positioning columns, the at least two positioning columns being in driving connection with the drive shaft, the positioning columns corresponding to the hole positions one by one and movably abutting against each other, the axes of the at least two positioning columns being arranged in parallel and located on the same plane, the middle positions of the axes of the at least two positioning columns being collinear with the axis of the drive shaft.

2. A positioning and clamping device according to claim 1, characterized in that The drive shaft is provided with a threaded hole, one end of the drive shaft is connected with a connecting plate, the connecting plate is provided with a bolt through hole, a bolt passes through the bolt through hole and is connected on the drive shaft, for fixing the connecting plate on the drive shaft, and the at least two positioning columns are connected on the connecting plate.

3. A positioning and clamping device according to claim 2, characterized in that The connecting plate is provided with a stepped hole corresponding to the positioning column one by one, the stepped hole is provided with a first end and a second end, the second end is threadedly connected with a screw, the positioning column is provided with a column body and a limiting portion, the column body is inserted on the first end, the limiting portion is tightly abutted against the inner wall of the second end, and one end of the limiting portion away from the column body is abutted against the screw.

4. A positioning and clamping device according to claim 1, characterized in that At least two of the positioning columns are provided with a guide portion, the guide portion movably abuts against the hole position, and the guide portion is used for guiding the movement of the workpiece.

5. A positioning and clamping device according to claim 1, characterized in that The fixing member is provided with a channel, a moving rod is movably inserted on the channel, the moving rod is movable between a first position and a second position, the fixing member is in the contracted state when the moving rod is in the first position, and the fixing member is in the expanded state when the moving rod is in the second position.

6. A positioning and clamping device according to claim 5, characterized in that The fixing member comprises: a main body; a tension sleeve, the tension sleeve being sleeved on the outside of the main body, the tension sleeve comprising a plurality of tension blocks arranged in a ring shape, and every two adjacent tension blocks being connected by a rubber block; a moving disc, the moving disc being connected with the moving rod and movably abutting against the tension sleeve.

7. A positioning and clamping device according to claim 6, characterized in that The main body is provided with a first inclined surface, the tension block is provided with a second inclined surface, the first inclined surface movably abutting against the second inclined surface, for driving the tension sleeve to expand when the moving disc moves towards the main body.

8. A positioning and clamping device according to claim 6, characterized in that The fixing member is provided with a limiting block, the limiting block movably abutting against the end of the tension block, for limiting the tension block.

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