CN219881903U - Positioning jig and dismounting clamp device - Google Patents

Abstract

The utility model discloses a positioning jig, which comprises: the body is provided with an accommodating hole for accommodating the tool handle and a rotating groove communicated with the accommodating hole, the hole wall of the accommodating hole is provided with a convex resisting step, and the resisting step is used for resisting the tool handle; the limiting piece is rotationally arranged in the rotating groove, is of a T-shaped structure and comprises a rotating part, a clamping part and a limiting part, the rotating part is rotationally connected with the body, the clamping part and the limiting part are oppositely arranged on two sides of the rotating part, and when the limiting piece rotates to a first position, the part of the structure of the rotating part positions a cutter handle inserted into the body in a first mode; when the limiting piece rotates to the second position, the part of the structure of the clamping part positions the cutter handle inserted into the body in the second shape. The positioning jig can position two insertion forms of the cutter handle, reduces the assembly cost, lightens the labor intensity of operators and shortens the operation time. The utility model also discloses a disassembling and assembling clamp device comprising the positioning jig.

Description

Positioning jig and dismounting clamp device

Technical Field

The utility model relates to the technical field of cutter positioning, in particular to a positioning jig and a dismounting clamp device.

Background

In general, a tool is locked by using a nut of a tool shank, and then the tool shank locked with the tool is locked on a main shaft through a blind rivet, so that machining such as cutting, drilling and the like can be conveniently performed. Along with the more and more kinds of products to be processed, different products need to use different cutters, and the cutter handle needs to be locked and attached to different main shafts, so that the cutter handle needs to be fixed by using the jig, and then the blind rivet and the nut on the cutter handle are replaced, so that the cutter handle is conveniently locked and attached to different main shafts and different cutters are replaced. However, a single jig can only be used for positioning one insertion form of the cutter handle so as to replace the blind rivet or the screw cap of the cutter handle, and the two insertion forms of the cutter handle cannot be positioned, so that the blind rivet and the screw cap of the cutter handle cannot be replaced by the single jig, the assembly cost of the jig is high, operators need to replace different jigs to perform different replacement operations, the labor intensity of the operators is high, and the operation time is long.

Disclosure of Invention

In view of the above, it is necessary to provide a positioning jig and a disassembling and assembling clamp device, so that the positioning jig can position both insertion modes of the tool handle, and the blind rivet and the nut of the tool handle are replaced by the positioning jig, thereby reducing the assembly cost, reducing the labor intensity of operators and shortening the operation time.

The embodiment of the utility model provides a positioning jig for positioning a cutter handle, which comprises: the body is provided with an accommodating hole for accommodating the tool handle and a rotating groove communicated with the accommodating hole, the hole wall of the accommodating hole is provided with a convex resisting step, and the resisting step is used for resisting the tool handle inserted into the accommodating hole; the limiting piece is rotationally arranged in the rotating groove, the limiting piece is of a T-shaped structure and comprises a rotating part, a clamping part and a limiting part, the rotating part is rotationally connected with the body, the clamping part and the limiting part are oppositely arranged on two sides of the rotating part, and the clamping part is positioned on one side of the rotating part facing the accommodating hole; when the limiting piece rotates to a first position, the limiting part is abutted against the bottom of the rotating groove, and part of the structure of the rotating part protrudes out of the hole wall of the accommodating hole and extends into the accommodating hole so as to position the cutter handle inserted into the body in a first mode; when the limiting piece rotates to the second position, part of the structure of the clamping part protrudes out of the hole wall of the accommodating hole and extends into the accommodating hole so as to position the tool handle inserted into the body in the second mode.

According to the positioning jig, in an initial state, the limiting piece rotates to the first position, the first mode of the cutter handle is that the cutter handle is inserted into the accommodating hole of the body from the blind rivet end, when the cutter handle is inserted into the accommodating hole of the body in the first mode, the step is resisted to resist the cutter handle, and the part of the structure of the rotating part protruding out of the hole wall of the accommodating hole is clamped on the cutter handle, so that the cutter handle is positioned, the cutter handle is prevented from rotating in the accommodating hole, and a nut on the cutter handle is convenient to replace; the second form of handle of a knife is the holding hole of handle of a knife by nut end insertion body, when the handle of a knife inserts the holding hole of body with the second form, handle of a knife butt rotation portion protrusion in the partial structure of holding hole's pore wall to make the locating part rotate for the body, keep out the step to the handle of a knife, the locating part rotates to the second position, and the partial structure card of joint portion protrusion in the pore wall of holding hole is on the handle of a knife, thereby fixes a position the handle of a knife, prevents that the handle of a knife from taking place to rotate in the holding hole, so that change the blind rivet on the handle of a knife. According to the positioning jig disclosed by the embodiment of the utility model, through the matching of the body and the limiting piece, the positioning jig can position two insertion forms of the cutter handle, so that the blind rivet and the nut of the cutter handle can be replaced by using the positioning jig, and the assembly cost can be reduced due to the fact that only one positioning jig is needed; because only the insertion form of the cutter handle needs to be changed, operators do not need to carry out cross operation among different jigs, thereby being beneficial to reducing the labor intensity of the operators, shortening the operation time and improving the operation efficiency.

In some embodiments, the outer peripheral side of the body is provided with a connection ring through which the body is connected to an external mechanism.

In some embodiments, a side of the clamping portion facing the protruding end of the limiting member is an arc surface.

In some embodiments, the positioning jig further comprises a rotating shaft, two ends of the rotating shaft are respectively connected with two opposite groove walls of the rotating groove, and the rotating part is sleeved on the rotating shaft.

In some embodiments, a distance between the rotation axis of the limiting member and the bottom of the rotation groove is greater than a distance between the end surface of the abutment step for abutting against the shank and the bottom of the rotation groove along the central axis direction of the body.

In some embodiments, the limiting member includes a first surface and a second surface that are disposed opposite to each other, the first surface is formed by sequentially connecting one surface of the clamping portion, one surface of the rotating portion, and one surface of the limiting portion, the second surface is formed by another opposite surface of the rotating portion, and a distance between a rotation axis of the limiting member and the first surface is greater than a distance between a rotation axis of the limiting member and the second surface.

In some embodiments, the number of the rotating grooves is two, the two rotating grooves are symmetrically arranged on the body, the number of the limiting parts is two, the two limiting parts are in one-to-one correspondence with the two rotating grooves and are respectively arranged in the corresponding rotating grooves, and the two limiting parts are symmetrically arranged.

In some embodiments, the hole wall of the accommodating hole is connected with the end face of the body facing the insertion direction of the tool handle through a first cambered surface.

In some embodiments, the resisting step is used for resisting connection between the end face of the tool handle and the hole wall of the accommodating hole through a second cambered surface.

The embodiment of the utility model also provides a disassembling and assembling clamp device which comprises the positioning jig according to any technical scheme.

According to the dismounting clamp device comprising the positioning jig, the positioning jig can be used for positioning two insertion forms of the cutter handle, so that the rivet and the nut of the cutter handle can be replaced by the positioning jig, and the assembly cost can be reduced due to the fact that only one positioning jig is needed; because only the insertion form of the cutter handle needs to be changed, operators do not need to carry out cross operation among different jigs, thereby being beneficial to reducing the labor intensity of the operators, shortening the operation time and improving the operation efficiency.

Drawings

Fig. 1 is a schematic perspective view of a positioning fixture according to an embodiment of the present utility model.

Fig. 2 is a schematic perspective view of a tool shank suitable for the positioning tool shown in fig. 1.

FIG. 3 is a schematic cross-sectional view of the positioning jig shown in FIG. 1 taken along III-III.

Fig. 4 is a schematic perspective view of the tool shank shown in fig. 2 inserted into the positioning tool in a first configuration.

Fig. 5 is a schematic cross-sectional view of the tool shank and positioning jig shown in fig. 4 along v-v.

Fig. 6 is a schematic perspective view of the tool shank shown in fig. 2 inserted into the positioning tool in a second configuration.

FIG. 7 is a schematic cross-sectional view of the tool shank and positioning jig shown in FIG. 6 taken along VII-VII.

Description of the main reference signs

Positioning jig 100

Body 10

Accommodation hole 11

Withstanding step 12

Rotating groove 13

Central axis 14

Connecting ring 15

First cambered surface 16

Second cambered surface 17

Stop 20

Rotating part 21

Clamping part 22

Limit part 23

Axis of rotation 24

First surface 25

Second surface 26

Rotating shaft 30

Fastening screw 40

Knife handle 200

Positioning ring 202

Positioning groove 204

Blind rivet 210

Nut 220

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, it is to be noted that the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the two components can be connected in a mechanical mode, can be electrically connected or can be communicated with each other, can be directly connected, can be indirectly connected through an intermediate medium, and can be communicated with each other inside the two components or can be in interaction relation with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Some embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, an embodiment of the present utility model provides a positioning jig 100, where the positioning jig 100 is used for positioning a tool shank 200 to prevent the tool shank 200 from rotating. The two ends of the tool shank 200 provided in some embodiments are respectively provided with a detachable blind rivet 210 and a nut 220, the blind rivet 210 and the nut 220 are connected through threads so as to be locked on the tool shank 200, the tool shank 200 is connected with a spindle through the blind rivet 210, the tool shank 200 is locked on the tool through the nut 220, a convex positioning ring 202 is arranged on the periphery side of the tool shank 200, a positioning groove 204 is formed in the positioning ring 202, one side of the positioning groove 204, facing the blind rivet 210, is of an open structure, one side of the positioning groove 204, facing the nut 220, is of a closed structure, the first form of the tool shank 200 is that the tool shank 200 is inserted into the positioning jig 100 from the blind rivet 210 end, and the second form of the tool shank 200 is that the tool shank 200 is inserted into the positioning jig 100 from the nut 220 end.

Referring to fig. 1 and 3, the positioning fixture 100 includes a body 10 and a limiting member 20.

Specifically, the body 10 is provided with a holding hole 11 for accommodating the tool shank 200 and a rotating groove 13 communicated with the holding hole 11, the wall of the holding hole 11 of the body 10 is provided with a convex resisting step 12, and the resisting step 12 is used for resisting the tool shank 200 inserted into the holding hole 11. In this embodiment, the retaining step 12 is annular, and since the hole wall of the accommodating hole 11 is provided with the protruding retaining step 12, the setting of the hole diameter of the accommodating hole 11 by the retaining step 12 is changed along the central axis 14 of the body 10.

The limiting piece 20 is rotationally arranged in the rotating groove 13, the limiting piece 20 is of a T-shaped structure and comprises a rotating portion 21, a clamping portion 22 and a limiting portion 23, the rotating portion 21 is rotationally connected with the body 10, the clamping portion 22 and the limiting portion 23 are oppositely arranged on two sides of the rotating portion 21, and the clamping portion 22 is located on one side of the rotating portion 21 facing the accommodating hole 11. When the limiting member 20 rotates to the first position (refer to fig. 5), the limiting portion 23 abuts against the bottom of the rotating groove 13, and a part of the structure of the rotating portion 21 protrudes from the wall of the accommodating hole 11 and extends into the accommodating hole 11, so that the handle 200 inserted into the body 10 in the first form is positioned by the part of the structure of the rotating portion 21 protruding from the wall of the accommodating hole 11. When the limiting member 20 rotates to the second position (refer to fig. 7), a part of the structure of the clamping portion 22 protrudes from the wall of the accommodating hole 11 and extends into the accommodating hole 11, so that the tool shank 200 inserted into the body 10 in the second shape is positioned by the part of the structure of the clamping portion 22 protruding from the wall of the accommodating hole 11.

Referring to fig. 4 and 5, when the positioning jig 100 positions the tool shank 200 inserted into the body 10 in the first form, the blind rivet 210 of the tool shank 200 is inserted into the accommodating hole 11 of the body 10, because the positioning groove 204 is of an open structure facing one side of the blind rivet 210, the positioning ring 202 of the tool shank 200 does not abut against a part of the structure of the rotating portion 21 protruding from the hole wall during the insertion of the tool shank 200 into the accommodating hole 11, that is, the limiting member 20 cannot be rotated, the positioning groove 204 of the tool shank 200 passes through a part of the structure of the rotating portion 21 protruding from the hole wall, and when the positioning ring 202 of the tool shank 200 abuts against the abutment step 12 in the accommodating hole 11, the abutment step 12 abuts against the tool shank 200, so that the tool shank 200 cannot be inserted into the accommodating hole 11 of the body 10 any more, and at this time, the part of the structure of the rotating portion 21 protruding from the hole wall is positioned in the positioning groove 204 of the tool shank 200, and the abutment step 12 and the rotating portion 21 cooperate to realize positioning of the tool shank 200, so that the tool shank 200 is prevented from rotating in the accommodating hole 11 of the body 10, and the nuts 220 are rotated by different nuts 220.

Referring to fig. 6 and 7, when the positioning jig 100 positions the tool shank 200 inserted into the body 10 in the second state, the nut 220 of the tool shank 200 is inserted into the accommodating hole 11 of the body 10, and the positioning groove 204 is of a closed structure toward one side of the nut 220, during the process of inserting the tool shank 200 into the accommodating hole 11, the positioning ring 202 of the tool shank 200 abuts against a part of the structure of the rotating portion 21 protruding from the hole wall, so that the limiting member 20 rotates relative to the body 10, thereby rotating the clamping portion 22 toward the accommodating hole 11, and during the process of rotating the clamping portion 22 toward the accommodating hole 11, the part of the structure of the clamping portion 22 gradually protrudes from the hole wall of the accommodating hole 11 and extends into the positioning groove 204, when the positioning ring 202 of the tool shank 200 abuts against the abutment step 12 in the accommodating hole 11, the abutment step 12 resists the tool shank 200, so that the tool shank 200 cannot be inserted into the accommodating hole 11 of the body 10 again, at this time, the limiting member 20 rotates to the second position, so that the part of the structure of the clamping portion 22 protruding from the hole wall of the tool shank 200 is located in the accommodating hole wall 200, and the abutment step 12 is located in the accommodating hole 11 of the tool shank 200, and the abutment step 210 is not matched with the tool shank 200, and the rotation of the tool shank 200 is prevented from being replaced by the rotation step 210. After the blind rivet 210 is replaced, the tool holder 200 is taken out from the accommodating hole 11 of the body 10, because one side of the positioning groove 204, which faces the nut 220, is of a closed structure, in the process that the tool holder 200 is pulled out from the accommodating hole 11, one side of the positioning groove 204, which faces the nut 220, is abutted against a part of the structure protruding from the hole wall of the clamping part 22, so that the limiting part 20 rotates reversely relative to the body 10, the clamping part 22 rotates away from the accommodating hole 11, and part of the structure of the rotating part 21 protrudes from the hole wall of the accommodating hole 11 again and extends into the accommodating hole 11, and when the tool holder 200 is pulled out from the accommodating hole 11, the limiting part 20 rotates reversely to a first position, so that the tool holder 200 inserted in a first shape or in a second shape is placed again.

Referring to fig. 1 and 3, in order to improve the positioning stability of the tool shank 200, the number of the rotating grooves 13 is two, the two rotating grooves 13 are symmetrically arranged on the body 10 to be correspondingly arranged with the two positioning grooves 204 on the tool shank 200, the number of the limiting members 20 is also two, the two limiting members 20 are correspondingly arranged with the two rotating grooves 13 one by one and are respectively arranged in the corresponding rotating grooves 13, and the two limiting members 20 are symmetrically arranged. Thus, the number of the rotation grooves 13 and the number of the limiting pieces 20 are two, so that the tool shank 200 is limited in two directions, and the positioning stability of the positioning tool 100 on the tool shank 200 is improved.

In order to achieve the effect that the limiting piece 20 is rotationally arranged in the rotating groove 13, the positioning jig 100 further comprises two rotating shafts 30, two ends of each rotating shaft 30 are respectively connected with two opposite groove walls of the corresponding rotating groove 13, and the rotating portion 21 of the corresponding limiting piece 20 is sleeved on the rotating shaft 30. In this embodiment, the rotation shaft 30 is rotatably connected to the body 10, and the rotation shaft 30 is fixedly connected to the limiting member 20. In other embodiments, the rotating shaft 30 may be rotatably connected to the body 10, and the rotating shaft 30 is rotatably connected to the limiting member 20. Thus, the rotation shaft 30 is provided to realize the effect that the limiting piece 20 is rotationally arranged in the rotation groove 13.

In order to facilitate the mounting of the positioning jig 100 on an external mechanism (not shown), the outer peripheral side of the body 10 is provided with a connection ring 15, and the body 10 is connected to the external mechanism through the connection ring 15. In this embodiment, the positioning fixture 100 further includes a plurality of fastening screws 40, and the fastening screws 40 penetrate through the connection ring 15 to be locked on an external mechanism, so as to realize connection between the positioning fixture 100 and the external mechanism. In addition, since the connecting ring 15 is provided on the outer peripheral side of the body 10, the cross-sectional area of the end surface of the positioning jig 100 connected to the external mechanism is large, which is advantageous for improving the stability of installation.

In order to facilitate the clamping portion 22 to fall into the positioning groove 204 of the tool holder 200 relatively easily, a side of the clamping portion 22 facing the protruding end of the limiting member 20 is an arc surface. The protruding end of the limiting member 20 is one end of the rotating portion 21 protruding out of the clamping portion 22 and the limiting portion 23. In this embodiment, in order to ensure that the limiting member 20 has a good balance during rotation, the limiting portion 23 and the locking portion 22 have the same structure. Thus, by limiting the arc surface of the clamping part 22, the clamping part 22 can easily fall into the positioning groove 204 of the tool shank 200 through the arc surface, so that the accuracy of positioning the tool shank 200 is ensured; in addition, by defining the structure of the engagement portion 22 and the limit portion 23 to be the same, the limit member 20 can be ensured to have good balance when rotating.

In order to ensure that the clamping portion 22 can smoothly fall into the positioning groove 204 of the tool holder 200, as shown in fig. 7, a distance between the rotation axis 24 of the limiting member 20 and the groove bottom of the rotation groove 13 along the central axis 14 direction of the body 10 is greater than a distance between the end surface of the abutment step 12 for abutting the tool holder 200 and the groove bottom of the rotation groove 13. Thus, by limiting the distance relationship, the withstanding step 12 can limit the tool holder 200 according to the preset insertion degree, so that the positioning groove 204 can be completely located in the accommodating hole 11, and the clamping portion 22 can be smoothly located in the positioning groove 204 of the tool holder 200, thereby improving the positioning accuracy of the positioning jig 100.

When the part of the structure of the locking portion 22 falls into the positioning groove 204 of the tool holder 200, in order to avoid that the limiting member 20 is easily rotated reversely due to vibration, so that the part of the structure of the locking portion 22 is separated from the positioning groove 204, referring to fig. 5, in this embodiment, the limiting member 20 is defined to include a first surface 25 and a second surface 26 that are disposed opposite to each other, the first surface 25 is formed by sequentially connecting one surface of the locking portion 22, one surface of the rotating portion 21 and one surface of the limiting portion 23, and the second surface 26 is formed by opposite other surfaces of the rotating portion 21, where a distance between the rotation axis 24 of the limiting member 20 and the first surface 25 is greater than a distance between the rotation axis 24 of the limiting member 20 and the second surface 26. Therefore, by limiting the distance relationship, when the limiting member 20 rotates to the first position, the center of gravity of the limiting member 20 is biased to the side away from the accommodating hole 11 relative to the rotation axis 24 of the limiting member 20, and when the limiting member 20 is vibrated, the limiting member 20 can be prevented from easily rotating, so that the tool shank 200 can be smoothly inserted into the accommodating hole 11 of the body 10, and the positioning stability of the positioning tool 100 is ensured.

In order to facilitate the insertion of the tool shank 200 into the accommodating hole 11 of the tool shank 10 and reduce the probability of the tool shank 200 being scratched by the tool shank 10, the hole wall of the accommodating hole 11 is connected with the end face of the tool shank 10 facing the insertion direction of the tool shank 200 through the first cambered surface 16; the withstanding step 12 is used for withstanding connection between the end face of the tool shank 200 and the hole wall of the accommodating hole 11 through a second cambered surface 17. Thus, by defining the above structure, the first cambered surface 16 and the second cambered surface 17 can widen the cross-sectional area of the corresponding opening, facilitating insertion of the tool shank 200 into the accommodation hole 11; the first cambered surface 16 and the second cambered surface 17 can also generate a guiding effect on the tool shank 200, which is beneficial to the tool shank 200 to be inserted into the accommodating hole 11; in addition, the contact area between the first cambered surface 16 and the second cambered surface 17 and the tool shank 200 can be increased, so that serious scratching of the tool shank 200 caused by right angles is avoided, and the probability of scratching the tool shank 200 by the body 10 is reduced.

In order to reduce the weight of the positioning fixture 100, in the present embodiment, the aperture of the upper portion of the accommodating hole 11 is smaller than the aperture of the lower portion of the accommodating hole 11. Thus, by enlarging the aperture of the lower portion of the accommodation hole 11, the weight of the positioning jig 100 can be reduced, and the handle 200 can be further prevented from being scratched.

The positioning jig 100 of the embodiment, through the cooperation of the body 10 and the limiting piece 20, enables the positioning jig 100 to position both insertion forms of the tool shank 200, so that the blind rivet 210 and the nut 220 of the tool shank 200 can be replaced by using the positioning jig 100 provided by the embodiment, and as only one positioning jig 100 is needed, the positioning jig 100 has a simple structure and can reduce the assembly cost; because only the insertion form of the tool shank 200 needs to be changed, operators do not need to carry out cross operation among different jigs, the operation is simple, the labor intensity of the operators is reduced, the operation time is shortened, and the operation efficiency is improved.

The embodiment of the utility model also provides a disassembling and assembling clamp device (not shown), which is used for positioning the tool shank 200 and disassembling the blind rivet 210 and the screw cap 220 of the tool shank 200. The dismounting device comprises the positioning jig 100 according to the above technical scheme. Thus, in the dismounting and clamping device of the embodiment, two insertion forms of the tool shank 200 can be positioned through the positioning jig 100, so that the blind rivet 210 and the nut 220 of the tool shank 200 can be replaced by using the dismounting and clamping device provided by the embodiment, and the assembly cost can be reduced due to the fact that only one positioning jig 100 is needed, and the positioning jig 100 is simple in structure; because only the insertion form of the tool shank 200 needs to be changed, operators do not need to carry out cross operation among different jigs, the operation is simple, the labor intensity of the operators is reduced, the operation time is shortened, and the operation efficiency is improved.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (10)

1. A positioning jig for fix a position the handle of a knife, its characterized in that, positioning jig includes:

the body is provided with an accommodating hole for accommodating the tool handle and a rotating groove communicated with the accommodating hole, the hole wall of the accommodating hole is provided with a convex resisting step, and the resisting step is used for resisting the tool handle inserted into the accommodating hole;

the limiting piece is rotationally arranged in the rotating groove, the limiting piece is of a T-shaped structure and comprises a rotating part, a clamping part and a limiting part, the rotating part is rotationally connected with the body, the clamping part and the limiting part are oppositely arranged on two sides of the rotating part, and the clamping part is positioned on one side of the rotating part facing the accommodating hole; when the limiting piece rotates to a first position, the limiting part is abutted against the bottom of the rotating groove, and part of the structure of the rotating part protrudes out of the hole wall of the accommodating hole and extends into the accommodating hole so as to position the cutter handle inserted into the body in a first mode; when the limiting piece rotates to the second position, part of the structure of the clamping part protrudes out of the hole wall of the accommodating hole and extends into the accommodating hole so as to position the tool handle inserted into the body in the second mode.

2. The positioning jig according to claim 1, wherein a connecting ring is provided on an outer peripheral side of the body, and the body is connected with an external mechanism through the connecting ring.

3. The positioning jig of claim 1, wherein a side of the clamping portion facing the protruding end of the limiting member is an arc surface.

4. The positioning jig of claim 1, further comprising a rotating shaft, wherein two ends of the rotating shaft are respectively connected with two opposite groove walls of the rotating groove, and the rotating part is sleeved on the rotating shaft.

5. The positioning jig according to claim 1, wherein a distance between a rotation axis of the stopper and a bottom of the rotation groove is greater than a distance between an end face of the abutment step for abutting against the shank and the bottom of the rotation groove in a direction of a central axis of the body.

6. The positioning jig according to claim 1, wherein the stopper includes a first surface and a second surface which are oppositely disposed, the first surface being formed by sequentially connecting one face of the engaging portion, one face of the rotating portion and one face of the stopper, the second surface being formed by opposite other faces of the rotating portion, and a distance between a rotation axis of the stopper and the first surface is greater than a distance between a rotation axis of the stopper and the second surface.

7. The positioning jig according to claim 1, wherein the number of the rotating grooves is two, the two rotating grooves are symmetrically arranged on the body, the number of the limiting pieces is two, the two limiting pieces are in one-to-one correspondence with the two rotating grooves and are respectively arranged in the corresponding rotating grooves, and the two limiting pieces are symmetrically arranged.

8. The positioning jig according to claim 1, wherein a hole wall of the accommodation hole is connected with an end surface of the body facing an insertion direction of the tool shank by a first arc surface.

9. The positioning jig of claim 1, wherein the retaining step is configured to retain the end surface of the shank and the hole wall of the receiving hole by a second arc surface.

10. A mounting-dismounting device comprising a positioning jig as claimed in any one of claims 1 to 9.