Standard part clamp

Abstract

The utility model relates to a standard part clamp which comprises a cushion block, a base and a plurality of pairs of clamping structures. The cushion block is installed on the machine tool, the base is arranged on the cushion block, the clamping structure comprises a pressing block, a screwing pressing arm and a guiding dovetail groove, the pressing block comprises a clamping block, dovetail tenon strips are arranged on the two sides of the bottom of the clamping block in parallel, a driving groove is formed in the clamping block in a penetrating mode, and a containing groove is formed in the base. A plurality of pairs of guide dovetail grooves corresponding to the dovetail tenon strips in position are symmetrically formed in the two sides of the containing groove, a shaft hole is formed in the center line of each pair of guide dovetail grooves, a screwing pressing arm penetrates through the clamping block to be installed in the shaft hole, and the clamping block is driven to move and clamp a workpiece through rotation of the screwing pressing arm; in the rapid clamping process of a standard part, the clamping structure does not need to be repeatedly adjusted, the screwing pressing arm is driven by an external driving device to do 90-degree reciprocating motion so that a workpiece can be rapidly clamped and released, and due to the fact that the driving groove is matched with the driving protruding block, the structure is simple and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a standard part clamp. Background Art

[0002] During the machining process, it is generally necessary to use a fixture to clamp and fix the workpiece to be processed to facilitate subsequent processing.

[0003] For example, the patent No. 202321760449.9 discloses a workpiece processing auxiliary fixture, including a base, the upper end of the base is provided with two clamping seats for clamping the workpiece, the clamping seat includes a push plate and a clamping block, one end of the push plate is connected to the clamping block, the clamping block is provided with a clearance hole along the length direction, the upper end of the push plate is slidably connected to a slide seat, the inner thread of the slide seat is connected to a clamping rod, the clamping rod cooperates with the clearance hole, one end of the clamping rod is provided with a rotating block, and the other end of the clamping rod is provided with a chuck for clamping the workpiece. A clamping rod is provided on the clamping seat, and the clamping rod can independently adjust the clamping position relative to the clamping seat. The clamping seat and the clamping rod cooperate to achieve multi-point clamping and fixation of special-shaped workpieces, thereby improving the firmness of the clamping and solving the problem of unreliable clamping of special-shaped workpieces by current bench vises, which is conducive to improving processing accuracy and efficiency and increasing versatility of use.

[0004] However, those skilled in the art have found that when the existing technology clamps a certain standard workpiece for a long time and in large quantities, it is necessary to adjust the clamping distance of the clamp each time the workpiece is clamped, which is a waste of time. How to use a simpler structure to achieve rapid clamping of standard workpieces is a technical problem that needs to be solved. Utility Model Content

[0005] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide a standard part clamp that has a simple structure and can achieve the effect of quickly clamping the standard workpiece to be processed.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a standard parts fixture, including a pad, a base, and several pairs of symmetrically arranged clamping structures; the pad is installed on the machine tool, the base is arranged on the pad, the clamping structure includes a pressure block, a tightening pressure arm, and a guide dovetail groove, the pressure block includes a clamping block, dovetail tenon strips are arranged parallel on both sides of the bottom of the clamping block, a driving groove is provided through the clamping block, and a placement groove for placing the workpiece is provided on the upper surface of the base along the length direction of the base, and several pairs of guide dovetail grooves corresponding to the position of the dovetail tenon strips are symmetrically arranged on both sides of the placement groove, and an axial hole is provided at the midline of each pair of guide dovetail grooves, the clamping block is slidably connected to the guide dovetail groove through the dovetail tenon strip, the bottom end of the tightening pressure arm passes through the clamping block and is installed in the axial hole, and the clamping block is driven to move by the rotation of the tightening pressure arm to clamp the workpiece.

[0007] Furthermore, the tightening pressure arm includes a positioning shaft, a driving protrusion, a limit block, and a rotating arm. The positioning shaft is arranged in the shaft hole along the vertical direction, the driving protrusion is located in the driving groove of the clamping block, the bottom of which is fixedly connected to the positioning shaft, and a limit block is provided on the top. One end of the rotating arm is fixedly set on the top of the limit block, and the other end of the rotating arm is connected to the external driving device. The rotating arm performs a 90-degree reciprocating motion driven by the external driving device.

[0008] Furthermore, the driving protrusion includes two eccentric bosses, which are perpendicular to each other and the larger ends of the two eccentric bosses overlap at the axis of the positioning shaft. The distance from the vertex of the smaller end of the eccentric boss to the axis of the positioning shaft is the clamping depth of the clamping block.

[0009] Furthermore, the eccentric boss is an oval boss.

[0010] Furthermore, the driving groove includes a rectangular groove, and an arc-shaped rotating groove is provided on one side of the rectangular groove. The shape of the rotating groove is the same as the motion trajectory of the part of the rectangular groove extending from the smaller end of the eccentric boss when the eccentric boss rotates with the axis of the positioning shaft as the rotation axis. The top edge of the rotating groove is connected to the upper edge of the rectangular groove, and a rotating groove is provided on the other side of the rectangular groove. The shape of the rotating groove is the same as the motion trajectory of the part of the rectangular groove extending from the larger end of the eccentric boss when the eccentric boss rotates with the axis of the positioning shaft as the rotation axis. The length of the rectangular groove is slightly larger than the length of the eccentric boss, and the width of the rectangular groove is slightly larger than half the length of the eccentric boss.

[0011] Furthermore, the rotating arm is connected to the limit block through an elbow, and the length direction of the rotating arm is perpendicular to the direction of the positioning axis.

[0012] Furthermore, a sloped surface is provided on the top of the clamping block near one end of the workpiece along the width direction of the clamping block.

[0013] The utility model does not need to repeatedly adjust the clamping structure during the rapid clamping of standard parts. The tightening pressure arm can quickly clamp and release the workpiece by performing a 90-degree reciprocating motion driven by an external driving device. Since the driving groove and the driving protrusion are matched, the structure is simple and reliable, the working efficiency is high, and it is not easy to be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall diagram of the utility model;

[0015] Figure 2 This is a top view of the base in the utility model;

[0016] Figure 3 This is a top view of the pressure block in the utility model;

[0017] Figure 4This is a three-dimensional diagram of the pressure block in the utility model;

[0018] Figure 5 This is a three-dimensional diagram of the tightening arm in the utility model;

[0019] Figure 6 This is a bottom view of the screw-tightening arm of the present invention;

[0020] Figure 7 This is a side view of the tightening arm in the utility model;

[0021] Figure 8 This is a schematic diagram of the clamping state of the clamping structure in the present utility model;

[0022] Figure 9 This is a schematic diagram of the release state of the clamping structure in the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0024] Example 1

[0025] like Figures 1 to 3 As shown, the utility model provides a standard part fixture, including a pad, a base 1, and several pairs of symmetrically arranged clamping structures 2; the pad is installed on the machine tool, the base 1 is set on the pad, the clamping structure 2 includes a pressure block 21, a tightening pressure arm 22, and a guide dovetail groove 23, the pressure block 21 includes a clamping block 2101, and dovetail tenon strips 2102 are arranged parallel on both sides of the bottom of the clamping block 2101. A driving groove 2103 is provided on the clamping block 2101. The upper surface of the base 1 is along the length of the base 1. A placement groove 11 for placing the workpiece is provided in the direction, and several pairs of guide dovetail grooves 23 corresponding to the position of the dovetail tenon strips 2102 are symmetrically arranged on both sides of the placement groove 11. An axial hole 24 is provided at the midline of each pair of guide dovetail grooves 23. The clamping block 2101 is slidably connected to the guide dovetail groove 23 through the dovetail tenon strip 2102. The bottom end of the tightening pressure arm 22 passes through the clamping block 2101 and is installed in the axial hole 24. The clamping block 2101 is driven to move by the rotation of the tightening pressure arm 22 to clamp the workpiece.

[0026] Furthermore, the tightening pressure arm 22 includes a positioning shaft 2201, a driving protrusion 2202, a limit block 2203, and a rotating arm 2204. The positioning shaft 2201 is arranged in the shaft hole 24 along the vertical direction, the driving protrusion 2202 is located in the driving groove 2103 of the clamping block 2101, and its bottom is fixedly connected to the positioning shaft 2201. A limit block 2203 is provided on the top. One end of the rotating arm 2204 is fixedly set on the top of the limit block 2203, and the other end of the rotating arm 2204 is connected to the external driving device. The rotating arm 2204 performs a 90-degree reciprocating motion driven by the external driving device.

[0027] Driven by the rotating arm 2204 , the driving protrusion 2202 rotates synchronously in the driving slot 2103 , thereby driving the clamping block 2101 to reciprocate to achieve clamping and releasing operations on the workpiece.

[0028] The driving protrusion 2202 includes two eccentric bosses 22021, which are perpendicular to each other and the larger ends of the two eccentric bosses 22021 overlap at the axis of the positioning shaft 2201. The distance from the vertex of the smaller end of the eccentric boss 22021 to the axis of the positioning shaft 2201 is the clamping depth of the clamping block 2101.

[0029] The eccentric boss 22021 is an oval boss. When the eccentric boss 22021 rotates driven by the rotating arm 2204, the top of its smaller end contacts the inner wall of the driving groove 2103 during the rotation process and continues to apply thrust so that the clamping block 2101 is displaced by the thrust.

[0030] The driving groove 2103 includes a rectangular groove 21031, and an arc-shaped rotating groove 21032 is provided on one side of the rectangular groove 21031. The shape of the rotating groove 21032 is the same as the movement trajectory of the part of the smaller end of the eccentric boss 22021 extending out of the rectangular groove 21031 when the eccentric boss 22021 rotates with the axis of the positioning shaft 2201 as the rotation axis. The top edge of the rotating groove 21031 is connected to the upper edge of the rectangular groove 21031, and a rotating groove 21033 is provided on the other side of the rectangular groove 21031. The shape of the rotating groove 21033 is the same as the movement trajectory of the part of the larger end of the eccentric boss 22021 extending out of the rectangular groove 21031 when the eccentric boss 22021 rotates with the axis of the positioning shaft 2201 as the rotation axis. The length of the rectangular groove 21031 is slightly larger than the length of the eccentric boss 22021, and the width of the rectangular groove 21031 is slightly larger than half the length of the eccentric boss 22021.

[0031] Since the length of the rectangular groove 21031 is slightly larger than the length of the eccentric boss 22021, and the width is slightly larger than half the length of the eccentric boss 22021, when the driving protrusion 2202 is driven by the rotating arm 2204, one of the two eccentric bosses 22021 that are perpendicular to each other rotates. During the rotation process, the eccentric boss 22021 rotates in the rotating groove 21032 and continues to rotate to the driving groove 2103. The smaller end of the eccentric boss 22021 abuts against the upper inner wall of the rectangular groove 21031. Since the clamping block 2101 is slidingly connected to the guide dovetail groove 23 through the dovetail tenon strip 2102, the smaller end of the eccentric boss 22021 abuts against the upper inner wall of the rectangular groove 21031 and continues to apply thrust, the clamping block 2101 is displaced by the thrust.

[0032] Obviously, when the driving protrusion 2202 rotates in the other direction driven by the rotating arm 2204, the other eccentric boss 22021 of the two eccentric bosses 22021 that are vertically connected to each other rotates. During the rotation process, the eccentric boss 22021 rotates in the rotating groove 21032 and continues to rotate to the driving groove 2103. The smaller end of the eccentric boss 22021 abuts against the lower inner wall of the rectangular groove 21031. Since the clamping block 2101 is slidingly connected to the guide dovetail groove 23 through the dovetail tenon strip 2102, the smaller end of the eccentric boss 22021 abuts against the lower inner wall of the rectangular groove 21031 and continues to apply thrust, the clamping block 2101 is reset by the thrust.

[0033] Since the clamping structures 2 are arranged in pairs with the placement slot 11 as the symmetry axis, the clamping structures 2 located on both sides of the placement slot 11 are mirror-imaged and move in opposite directions, that is, the clamping structures 2 located on both sides of the placement slot 11 move away from the placement slot 11 or move toward the placement slot 11 at the same time, thereby achieving clamping or releasing of the workpiece.

[0034] The rotating arm 2204 is connected to the limit block 2203 through an elbow, and the length direction of the rotating arm 2204 is perpendicular to the direction of the positioning axis 2201.

[0035] By providing a rotating arm 2204 with a certain length and connecting it to an external driving device, the external driving device drives the rotating arm 2204 to achieve reciprocating motion between 0 degrees and 90 degrees.

[0036] A sloped surface 3 is provided on the top of the clamping block 2101 close to one end of the workpiece along the width direction of the clamping block 2101 .

[0037] In actual applications, due to the different lengths of workpieces, the standard part fixture provided by the utility model can increase or decrease the number of corresponding pressing blocks according to the length of the workpiece, so as to match workpieces of different lengths.

[0038] Finally, it should be noted that the embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A standard part fixture, comprising a pad, a base, and several pairs of symmetrically arranged clamping structures; the pad is mounted on a machine tool, and the base is mounted on the pad, characterized in that: The clamping structure includes a pressure block, a tightening pressure arm, and a guide dovetail groove. The pressure block includes a clamping block, dovetail tenon strips are arranged parallel on both sides of the bottom of the clamping block, a driving groove is provided on the clamping block, and a placement groove for placing the workpiece is provided on the upper surface of the base along the length direction of the base. Several pairs of guide dovetail grooves corresponding to the position of the dovetail tenon strips are symmetrically arranged on both sides of the placement groove. An axial hole is provided at the midline of each pair of guide dovetail grooves. The clamping block is slidably connected to the guide dovetail groove through the dovetail tenon strip. The bottom end of the tightening pressure arm passes through the clamping block and is installed in the axial hole, and the clamping block is driven to move by the rotation of the tightening pressure arm.

2. The standard component fixture according to claim 1, characterized in that: The tightening pressure arm includes a positioning shaft, a driving protrusion, a limit block, and a rotating arm. The positioning shaft is arranged in the shaft hole along the vertical direction, the driving protrusion is located in the driving groove of the clamping block, the bottom of which is fixedly connected to the positioning shaft, and a limit block is provided on the top. One end of the rotating arm is fixedly set on the top of the limit block, and the other end of the rotating arm is connected to the external driving device. The rotating arm performs a 90-degree reciprocating motion under the drive of the external driving device.

3. The standard component fixture according to claim 2, characterized in that: The driving protrusion includes two eccentric bosses, which are perpendicular to each other and the larger ends of the two eccentric bosses overlap at the axis of the positioning shaft. The distance from the vertex of the smaller end of the eccentric boss to the axis of the positioning shaft is the clamping depth of the clamping block.

4. The standard component fixture according to claim 3, characterized in that: The eccentric boss is an oval boss.

5. The standard component fixture according to claim 3, characterized in that: The driving groove includes a rectangular groove, and an arc-shaped rotating groove is provided on one side of the rectangular groove. The shape of the rotating groove is the same as the motion trajectory of the part of the rectangular groove extending from the smaller end of the eccentric boss when the eccentric boss rotates with the axis of the positioning shaft as the axis. The top edge of the rotating groove is connected to the upper edge of the rectangular groove, and a rotary groove is provided on the other side of the rectangular groove. The shape of the rotary groove is the same as the motion trajectory of the part of the rectangular groove extending from the larger end of the eccentric boss when the eccentric boss rotates with the axis of the positioning shaft as the axis. The length of the rectangular groove is slightly larger than the length of the eccentric boss, and the width of the rectangular groove is slightly larger than half the length of the eccentric boss.

6. The standard component fixture according to claim 2, characterized in that: The rotating arm is connected to the limit block through an elbow, and the length direction of the rotating arm is perpendicular to the direction of the positioning axis.

7. The standard component fixture according to any one of claims 1 to 6, characterized in that: The top of the clamping block close to one end of the workpiece is provided with a sloped surface along the width direction of the clamping block.

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