CN219986345U - Clamp - Google Patents

Abstract

The present disclosure relates to a fixture for positioning a fork, the fork including two sides opposite along a first direction, an arc-shaped toggle groove formed at one end of the fork along a second direction, and a spline groove formed at one side of the fork along a third direction, the fixture comprising: the base is used for being connected to a workbench of the milling machine; the positioning piece is connected to the base and comprises a first positioning piece used for being abutted against the arc-shaped toggle groove and a second positioning piece used for being abutted against one side surface of the shifting fork along the first direction; and the fixing piece is connected to the base and is used for being abutted to the other side face of the shifting fork along the first direction so that the shifting fork is clamped between the fixing piece and the second positioning piece, and/or is used for being abutted to the other end of the shifting fork opposite to the arc-shaped shifting groove so that the shifting fork is clamped between the fixing piece and the first positioning piece. Through the technical scheme, the shifting fork can be positioned more accurately during processing of the spline grooves, and processing precision is improved.

Description

Clamp

Technical Field

The present disclosure relates to the technical field of jigs for processing, and in particular, to a jig.

Background

The shifting fork is widely used for a speed change mechanism, for example, on a lathe, the shifting fork can be used for changing the position of a sliding gear, two gears meshed with each other are shifted through the shifting fork, the gears are shifted to be meshed with other gears, and the transmission ratio is changed, so that the speed change of the rotary motion of an output shaft of the lathe is realized.

In the related art, a shifting fork is generally molded by adopting a metal mold casting method, a blank is precisely cast and manufactured, and then the size of the shifting fork is precisely machined through a milling machine. The middle spline groove of the shifting fork is a transmission connection part for enabling the shifting fork to rotate, spline connection is multi-tooth work, bearing capacity is high, centering accuracy is high, but tooth roots are shallow, stress is concentrated, and therefore the requirement on dimensional accuracy is high. When the spline groove in the shifting fork is finished, the clamping is difficult because of irregular shape of the shifting fork, and the condition of inaccurate positioning is easy to exist.

Disclosure of Invention

It is an object of the present disclosure to provide a clamp that is capable of more accurately positioning a fork when finish milling a spline groove to at least partially solve the above technical problems.

In order to achieve the above object, the present disclosure provides a clamp for positioning a fork including two sides opposite in a first direction, an arc-shaped toggle groove formed at one end of the fork in a second direction, and a spline groove formed at one side of the fork in a third direction, the clamp comprising:

the base is used for being connected to a workbench of the milling machine;

the positioning piece is connected to the base and comprises a first positioning piece used for abutting against the arc-shaped poking groove and a second positioning piece used for abutting against one side surface of the poking fork; and

the fixing piece is connected to the base, and is used for being abutted to the other side face of the shifting fork, so that the shifting fork is clamped between the fixing piece and the second positioning piece, and/or is used for being abutted to the other end, opposite to the arc-shaped shifting groove, of the shifting fork, so that the shifting fork is clamped between the fixing piece and the first positioning piece.

Optionally, the first positioning piece includes an arc positioning block, the arc positioning block has an arc outer wall surface, and the arc outer wall surface is used for being attached to the groove wall of the arc toggle groove.

Optionally, the first positioning piece further comprises a connecting part, and the arc-shaped positioning piece is adjustably connected to the base through the position of the connecting part so as to be capable of moving towards or away from the base;

the connecting portion is constructed as a double-end stud, one end of the double-end stud is in threaded connection with the base, and the other end of the double-end stud is in threaded connection with the arc-shaped positioning block.

Optionally, a connecting key is arranged on the base, and the connecting key is used for positioning the base on a workbench of the milling machine;

the base is provided with a threaded hole penetrating through the base, the stud is in threaded connection with one end of the threaded hole, the connecting key is detachably connected with the base through a fixing bolt, and the fixing bolt is in threaded connection with the threaded hole and is far away from the other end of the stud.

Optionally, the second locating piece includes first mount pad and location portion, first mount pad connect in the base, location portion position adjustable connect in first mount pad, location portion has the locating surface, the locating surface be used for laminating in the side of shift fork.

Optionally, the positioning portion includes a positioning bolt, the positioning bolt is screwed to the first mounting seat, and the positioning surface is formed on a head of the positioning bolt.

Optionally, the mounting includes second mount pad and top tight piece, the second mount pad connect in the base, top tight piece position adjustable connect in the second mount pad, top tight piece has and is used for the top to hug closely in the top tight face of shift fork.

Optionally, the propping piece comprises a propping bolt and a smooth surface pressing block, the propping bolt is in threaded connection with the second mounting seat, the smooth surface pressing block is connected with the propping bolt, and the propping surface is formed on the smooth surface pressing block.

Optionally, be equipped with support piece on the base, support piece is used for being located the base with between the shift fork, support piece has the holding surface, the holding surface is used for supporting the laminating the shift fork.

Optionally, the supporting member includes at least two groups of adjusting members, the supporting surface is formed on the adjusting members, and the adjusting members are adjustably connected to the base in position so as to be capable of adjusting the distance between the supporting surface and the base;

the adjusting piece comprises a supporting seat and an adjusting bolt, the adjusting bolt penetrates through the supporting seat and is in threaded connection with the base, a gasket can be clamped between the supporting seat and the base, and the supporting surface is formed on the top surface, deviating from the base, of the supporting seat.

Through the technical scheme, the fixture is connected to the workbench of the milling machine through the base, and the locating piece and the fixing piece connected to the base are used for locating and fixing the shifting fork, specifically, the locating piece comprises a first locating piece and a second locating piece, the first locating piece is used for abutting the arc-shaped shifting groove of the shifting fork, the second locating piece is used for abutting one of two side surfaces of the shifting fork along the first direction, the fixing piece is abutted to the other side surface of the shifting fork along the first direction, or the fixing piece is abutted to the other end of the shifting fork opposite to the arc-shaped shifting groove, or the fixing piece is simultaneously abutted to the other side surface of the shifting fork along the first direction and the other end of the shifting fork opposite to the arc-shaped shifting groove, so that the shifting fork can be located more accurately when the spline groove is machined, and the machining precision of the spline groove is improved.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic front view of a fork provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic top view of a fork provided in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic elevational structural view of a clip provided in an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic top view of a clip provided in an exemplary embodiment of the present disclosure;

FIG. 5 is a schematic side view of a clip provided in an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic elevational view of a clamp provided in an exemplary embodiment of the present disclosure when clamping a fork;

FIG. 7 is a schematic top view of a clamp provided in an exemplary embodiment of the present disclosure when clamping a fork;

fig. 8 is a schematic side view of a clamp provided in an exemplary embodiment of the present disclosure when clamping a fork.

Description of the reference numerals

1. A shifting fork; 11. an arc-shaped toggle groove; 12. spline grooves; 2. a base; 21. a threaded hole; 22. a U-shaped groove; 3. a positioning piece; 31. a first positioning member; 311. an arc-shaped positioning block; 312. a connection part; 3121. a double-ended stud; 32. a second positioning member; 321. a first mount; 322. a positioning part; 3221. positioning bolts; 4. a fixing member; 41. a second mounting base; 42. a tightening member; 421. a jack bolt; 422. pressing a smooth surface into a block; 43. a threaded bushing; 44. a locking screw; 5. a connecting key; 51. a fixing bolt; 6. a support; 61. an adjusting member; 611. a support base; 612. an adjusting bolt; 7. a stabilizing piece; 71. soft rubber; 8. and (5) setting the tool block.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, for convenience of description, a first direction, a second direction, and a third direction are defined for a clamp and a fork, wherein "X" represents the first direction, "Y" represents the second direction, and "Z" represents the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. Unless otherwise indicated, terms of orientation such as "upper and lower" are used to generally refer to the upper and lower directions of the fixture in the vertical direction after the fixture is attached to the table of the milling machine; "inner and outer" refer to the interior and exterior of the corresponding component profile; "distal" and "proximal" refer to the relative spatial positions of a respective component with respect to another component. Furthermore, the terms "first," "second," and the like, as used in this disclosure, are used for distinguishing one element from another and not necessarily for describing a sequential or chronological order. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.

The jig in the exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings.

Referring to fig. 1 to 8, the present disclosure provides a jig for positioning a fork 1, wherein the fork 1 includes two sides opposite in a first direction, an arc-shaped toggle groove 11 formed at one end of the fork 1 in a second direction, and a spline groove 12 formed at one side of the fork 1 in a third direction, as shown in fig. 1 and 2. For convenience of description, after the shift fork 1 is mounted on the fixture, the third direction is taken as a vertical direction, and the first direction and the second direction are both horizontal directions parallel to a horizontal plane for example.

Referring to fig. 3 to 8, the jig includes a base 2 for connection to a table of a milling machine, and a positioning member 3 and a fixing member 4 connected to the base 2. The positioning piece 3 comprises a first positioning piece 31 and a second positioning piece 32, wherein the first positioning piece 31 is used for abutting against the arc-shaped poking groove 11, and the second positioning piece 32 is used for abutting against one of two side surfaces of the poking fork 1 along the first direction. The fixing member 4 is used to abut and press against the other side surface of the two side surfaces of the fork 1 in the first direction so that the fork 1 is clamped between the fixing member 4 and the second positioning member 32.

Through this technical scheme, anchor clamps pass through base 2 to be connected in the workstation of milling machine, place shift fork 1 on base 2, the side that the spline groove 12 that waits to process of shift fork 1 is at this moment upwards, first setting element 31 butt arc is stirred groove 11, second setting element 32 butt shift fork 1 is along one of them side of first direction, mounting 4 butt and the opposite side of tight shift fork 1 along first direction are held in the centre gripping of shift fork 1 between mounting 4 and second setting element 32, from this, when mounting 4 and second setting element 32 centre gripping are fixed shift fork 1, utilize first setting element 31 butt arc to stir groove 11, can further prevent shift fork 1 rotation, so that can more accurately fix a position shift fork 1 when processing spline groove 12, improve the machining precision of spline groove 12.

In another embodiment, not shown, the fixing member 4 may abut and abut against the other end of the fork 1 opposite to the arc-shaped toggle groove 11, so that the fork 1 is clamped between the fixing member 4 and the first positioning member 31, and thus, the fork 1 may be further prevented from rotating by abutting the second positioning member 32 against the fork 1 while the fixing member 4 clamps and fixes the fork 1 in the first positioning member 31; in addition, the fixing members 4 may abut and abut against the other side surface of the shift fork 1 along the first direction and the other end of the shift fork 1 opposite to the arc-shaped toggle groove 11, for example, the number of the fixing members 4 may be two, where one fixing member 4 clamps the shift fork 1 in the second direction in the first positioning member 31, and the other fixing member 4 clamps the shift fork 1 in the first direction in the second positioning member 32. The above embodiments can realize more accurate positioning of the fork 1 when machining the spline groove 12, and improve the machining accuracy of the spline groove 12, and the present disclosure is not limited thereto.

In some embodiments, as shown in fig. 6 and 7, the first positioning member 31 includes an arc positioning block 311, where the arc positioning block 311 has an arc outer wall surface, and the arc outer wall surface is used to be attached to a slot wall of the arc toggle slot 11.

When the spline groove 12 of the shifting fork 1 is machined, the shifting fork 1 is placed on the base 2 in a mode that one side of the spline groove 12 to be machined is upward, positioning of the shifting fork 1 in the third direction is completed, the outer wall surface of the arc-shaped positioning block 311 abuts against the groove wall of the arc-shaped stirring groove 11 of the shifting fork 1, so that preliminary positioning of the shifting fork 1 in the first direction and the second direction is completed, and then positioning of the shifting fork 1 is completed through the second positioning piece 32 and the fixing piece 4. Wherein, arc locating piece 311 has the arc outer wall face with the cell wall looks adaptation of arc stirring groove 11, through the mode of face laminating, not only can strengthen the stability when centre gripping shift fork 1, can also prevent the cell wall of scratch wearing and tearing arc stirring groove 11.

In some embodiments, as shown in fig. 6, the first positioning member 31 further includes a connection portion 312, and the arc-shaped positioning block 311 is connected to the base 2 through the connection portion 312 in a position-adjustable manner so as to be capable of moving toward or away from the base 2.

The arc-shaped positioning block 311 can move toward or away from the base 2, i.e., the arc-shaped positioning block 311 can realize adjustment of the height in the third direction, so as to be able to adapt to the positioning of the fork 1 having the same arc-shaped toggle grooves 11 but different sizes in the third direction, or to be able to cooperate with the supporting member 6 (to be described in detail later) to adjust the height of the fork 1 in the third direction.

The connection portion 312 may be configured in any suitable manner, for example, the connection portion 312 may be configured as a stud 3121, one end of the stud 3121 being screwed to the base 2, and the other end being screwed to the arc-shaped positioning block 311. Specifically, the depth of the threaded connection in the base 2 of the stud 3121 can be rotated to adjust the height of the arc positioning block 311 in the third direction, and meanwhile, the positioning requirement of the abutting arc toggle groove 11 can be met by rotating the arc positioning block 311.

It can be appreciated that the stud 3121 can also detachably connect the arc positioning block 311 to the base 2, and replace the arc positioning block 311 according to the different sizes of the arc toggle groove 11, so as to meet the positioning requirement of the arc positioning block 311 abutting the arc toggle groove 11.

In another embodiment, not shown, the connection portion 312 may also be configured as a telescopic rod or the like connected between the arc-shaped positioning block 311 and the base 2, to which the present disclosure is not limited.

In some embodiments, as shown in fig. 6 and 7, the second positioning member 32 may include a first mounting seat 321 and a positioning portion 322, the first mounting seat 321 is connected to the base 2, the positioning portion 322 is adjustably connected to the first mounting seat 321, and the positioning portion 322 has a positioning surface for fitting to one of two side surfaces of the fork 1 along the first direction.

After the groove wall of the arc-shaped poking groove 11 of the poking fork 1 is abutted against the first positioning piece 31, one side surface of the poking fork 1 is abutted against the positioning part 322, and/or the position of the positioning part 322 relative to the first mounting seat 321 is adjusted, so that the positioning surface is abutted against one side surface of the poking fork 1, and the movement of the poking fork 1 rotating around the center of the arc-shaped poking groove 11 is limited, so that the positioning of the poking fork 1 during the processing of the spline groove 12 is completed.

In one embodiment, as shown in fig. 6 and 7, the positioning portion 322 includes a positioning bolt 3221, the positioning bolt 3221 is screwed to the first mounting seat 321, and a positioning surface is formed on a head portion of the positioning bolt 3221.

After the groove wall of the arc-shaped poking groove 11 of the poking fork 1 is abutted against the first positioning piece 31, one side surface of the poking fork 1 is rotated to be abutted against the head of the positioning bolt 3221, and the poking fork 1 is limited to move around the center of the arc-shaped poking groove 11, so that the positioning of the poking fork 1 during processing of the spline groove 12 is completed.

It will be appreciated that by adjusting the depth of the threaded connection of the positioning bolt 3221 within the first mounting seat 321, the position of the positioning surface can be adjusted along the first direction, and thus the positioning of the fork 1 having different dimensions along the first direction can be performed.

In another embodiment, not shown, the positioning portion 322 may be configured as a positioning rod that is movably connected to the first mount 321, the positioning surface being formed on an end surface of the positioning rod, and the positioning rod may be locked to and unlocked from the first mount 321 by a fastener such as a bolt.

In some embodiments, as shown in fig. 7 and 8, the fixing member 4 includes a second mounting seat 41 and a tightening member 42, the second mounting seat 41 is connected to the base 2, the tightening member 42 is adjustably connected to the second mounting seat 41, and the tightening member 42 has a tightening surface for fitting to the other one of the two sides of the fork 1 in the first direction.

After the groove wall of the arc-shaped poking groove 11 of the poking fork 1 is abutted against the first positioning piece 31 and one side surface of the poking fork 1 along the first direction is abutted against the second positioning piece 32, the jacking piece 42 is adjusted to be abutted against the other side surface of the poking fork 1, so that the poking fork 1 is clamped between the jacking piece 42 and the second positioning piece 32, and the fixation of the poking fork 1 is completed.

In other embodiments, the abutment surface is used to attach to the other end of the fork 1 opposite to the arc-shaped poking groove 11, and similarly, after the groove wall of the arc-shaped poking groove 11 of the fork 1 is abutted to the first positioning member 31 and one of the side surfaces of the fork 1 is turned to abut to the second positioning member 32, the abutment member 42 is adjusted to attach to the other end of the fork 1 opposite to the arc-shaped poking groove 11 along the second direction, so as to clamp the fork 1 between the abutment member 42 and the first positioning member 31, and fixing the fork 1 is completed.

The puller 42 may be configured in any suitable manner, for example, in one embodiment, as shown in fig. 7 and 8, the puller 42 includes a puller bolt 421 and a smooth surface press block 422, the puller bolt 421 is screwed to the second mount 41, the smooth surface press block 422 is connected to the puller bolt 421, and the puller surface is formed on the smooth surface press block 422.

After the groove wall of the arc-shaped poking groove 11 of the shifting fork 1 is abutted against the first positioning piece 31 and one side surface of the shifting fork 1 along the first direction is abutted against the second positioning piece 32, the jacking bolt 421 is adjusted to the smooth pressing block 422 to be abutted against the shifting fork 1, namely the jacking surface is abutted against the other side surface of the shifting fork 1 along the first direction, so that the shifting fork 1 is clamped between the jacking piece 42 and the second positioning piece 32, and the fixation of the shifting fork 1 is completed.

Further, the second mounting seat 41 is screwed with a threaded bushing 43, the tightening bolt 421 is screwed into the threaded bushing 43, and the second mounting seat 41 is screwed with a locking screw 44 embedded in the threaded bushing 43, so as to improve the stability of the tightening bolt 421 when the fork 1 is fixed by the smooth pressing block 422.

In other embodiments, the tightening member 42 may also be configured as a tightening rod movably connected to the second mount 41, with a tightening surface formed on an end surface of the tightening rod, which may be locked and unlocked with respect to the second mount 41 by a fastener such as a bolt.

In one embodiment, as shown in fig. 6 and 7, the base 2 is provided with a connecting key 5, and the connecting key 5 is used for positioning the base 2 on a workbench of a milling machine.

In the process of mounting the base 2 on the table of the milling machine, the mounting position of the base 2 on the table of the milling machine is positioned by the connection key 5, for example, the connection key 5 may be inserted into a positioning groove on the table, and then the base 2 is fixed to the table of the milling machine by the U-shaped groove 22 on the base 2, for example, a fastening member such as a bolt may be connected to the table of the milling machine through the U-shaped groove 22.

In some specific embodiments, referring to fig. 6, a threaded hole 21 penetrating the base 2 is formed in the base 2, the stud 3121 is screwed to one end of the threaded hole 21, the connection key 5 is detachably connected to the base 2 by a fixing bolt 51, the fixing bolt 51 is screwed to the other end of the stud 3121 based on the principle that the threaded hole 21, and specifically, the fixing bolt 51 is screwed to the threaded hole 21 after penetrating the connection key 5. Thereby, the fixing bolt 51 and the stud 3121 can be made to share one screw hole 21 to reduce the manufacturing cost.

In some embodiments, as shown in fig. 6 and 7, a support member 6 is provided on the base 2, the support member 6 is configured to be located between the base 2 and the fork 1, and the support member 6 has a support surface for supporting the fitting fork 1.

The spline groove 12 is machined along the third direction, when the shifting fork 1 is placed on the base 2, the supporting piece 6 supports the shifting fork 1, the supporting surface is attached to the shifting fork 1, and the supporting surface is perpendicular to the third direction, so that machining accuracy of the spline groove 12 can be improved.

In one embodiment, as shown in fig. 6 and 7, the supporting member 6 includes at least two sets of adjusting members 61, the supporting surface is formed on the adjusting members 61, and the adjusting members 61 are adjustably connected to the base 2 in position so as to be capable of adjusting the distance between the supporting surface and the base 2.

The adjusting member 61 adjusts the distance between the support surface and the base 2 to adjust the support surface to be perpendicular to the third direction, reducing an error between the jig and the milling machine due to the installation.

In some specific embodiments, the adjusting member 61 may include a supporting seat 611 and an adjusting bolt 612, where the adjusting bolt 612 passes through the supporting seat 611 and is screwed to the base 2, and a spacer may be interposed between the supporting seat 611 and the base 2, and a supporting surface is formed on a top surface of the supporting seat 611 facing away from the base 2. Specifically, the depth of the adjusting bolt 612 in the base 2 is changed, and a feeler gauge or a gasket is added between the supporting seat 611 and the base 2, so that a supporting surface formed by the supporting seat 611 can be attached to the shifting fork 1 to support the shifting fork 1.

It will be appreciated that the adjustment members 61 are provided in at least two groups to enhance the support of the fork 1 by the support members 6 to improve the stability of the support of the fork 1 by the support members 6 during processing of the spline grooves 12.

In some embodiments, as shown in fig. 7 and 8, the side of the second positioning member 32 and the abutting member 42 abutting against the shift fork 1 is provided with a stabilizing member 7, specifically, the stabilizing member 7 is configured as a soft rubber 71 for increasing friction force along the first direction, the second direction, or both the first direction and the second direction, and avoiding abrasion to the surface of the shift fork 1.

In one embodiment, as shown in fig. 6 and 7, a setting block 8 is provided on the base 2 for setting the milling cutter before machining the spline groove 12 after positioning and fixing the fork 1 is completed.

When the spline groove 12 of the shifting fork 1 needs to be machined, the fixture is firstly installed on a workbench of a milling machine through the base 2, then the shifting fork 1 is placed on the supporting piece 6, the groove wall of the arc-shaped shifting groove 11 is abutted against the first positioning piece 31, the supporting surface is perpendicular to the third direction, namely the machining direction of the spline groove 12, the shifting fork 1 is rotated to one side of the first direction to be abutted against the second positioning piece 32, then the shifting fork 1 is clamped and fixed between the fixing piece 4 and the second positioning piece 32 through the fixing piece 4, so that the positioning and fixing of the shifting fork 1 are completed, and then the spline groove 12 of the shifting fork 1 is machined.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A clamp for positioning a fork, the fork including two sides opposite in a first direction, an arcuate toggle slot formed in one end of the fork in a second direction, and a spline slot formed in one side of the fork in a third direction, the clamp comprising:

the base is used for being connected to a workbench of the milling machine;

the positioning piece is connected to the base and comprises a first positioning piece used for abutting against the arc-shaped poking groove and a second positioning piece used for abutting against one side surface of the poking fork; and

the fixing piece is connected to the base, and is used for being abutted to the other side face of the shifting fork, so that the shifting fork is clamped between the fixing piece and the second positioning piece, and/or is used for being abutted to the other end, opposite to the arc-shaped shifting groove, of the shifting fork, so that the shifting fork is clamped between the fixing piece and the first positioning piece.

2. The clamp of claim 1, wherein the first positioning member comprises an arcuate positioning block having an arcuate outer wall surface for conforming to a slot wall of the arcuate toggle slot.

3. The clamp of claim 2, wherein the first positioning member further comprises a connecting portion by which the arc-shaped positioning block is adjustably connected to the base so as to be movable toward or away from the base;

the connecting portion is constructed as a double-end stud, one end of the double-end stud is in threaded connection with the base, and the other end of the double-end stud is in threaded connection with the arc-shaped positioning block.

4. A fixture according to claim 3, wherein the base is provided with a connecting key for positioning the base on a table of the milling machine;

the base is provided with a threaded hole penetrating through the base, the stud is in threaded connection with one end of the threaded hole, the connecting key is detachably connected with the base through a fixing bolt, and the fixing bolt is in threaded connection with the threaded hole and is far away from the other end of the stud.

5. The clamp of claim 1, wherein the second positioning member comprises a first mounting seat and a positioning portion, the first mounting seat is connected to the base, the positioning portion is adjustably connected to the first mounting seat, and the positioning portion has a positioning surface for fitting to a side surface of the fork.

6. The clamp of claim 5, wherein the positioning portion includes a positioning bolt threadably coupled to the first mount base, the positioning surface being formed on a head of the positioning bolt.

7. The clamp of claim 1, wherein the securing member includes a second mount and a tightening member, the second mount being coupled to the base, the tightening member being adjustably positionable coupled to the second mount, the tightening member having a tightening surface for tightening against the fork.

8. The fixture of claim 7, wherein the tightening member comprises a tightening bolt and a smooth surface press block, the tightening bolt is in threaded connection with the second mount, the smooth surface press block is connected with the tightening bolt, and the tightening surface is formed on the smooth surface press block.

9. A clamp according to claim 1, wherein a support is provided on the base for being located between the base and the fork, the support having a support surface for supporting engagement with the fork.

10. The clamp of claim 9, wherein the support member includes at least two sets of adjustment members, the support surface being formed on the adjustment members, the adjustment members being positionally adjustably coupled to the base to enable adjustment of a distance between the support surface and the base;

the adjusting piece comprises a supporting seat and an adjusting bolt, the adjusting bolt penetrates through the supporting seat and is in threaded connection with the base, a gasket can be clamped between the supporting seat and the base, and the supporting surface is formed on the top surface, deviating from the base, of the supporting seat.