CMM measurement auxiliary clamp and measurement system

Abstract

The utility model provides a CMM measurement auxiliary clamp and a measurement system. The CMM measurement auxiliary clamp comprises a pedestal; the supporting assembly is mounted on the base; the positioning seat is mounted on the supporting assembly, and a positioning groove is formed in the first side; the clamping seat is located on the first side of the positioning seat and provided with a guide shaft connected with the positioning seat in a sliding mode, a clamping position is formed between the clamping seat and the positioning groove, and a clamping position is arranged on the guide shaft; the locking assembly comprises a locking auxiliary plate and a locking bolt, opening grooves matched with the guide shafts are formed in the locking auxiliary plate, one guide shaft penetrates through one opening groove, the opening grooves are connected with the clamping positions on the guide shafts penetrating through the opening grooves in a clamped mode, and the locking bolt is installed on the locking auxiliary plate; the tail end of a screw rod of the locking bolt can abut against the second side of the positioning base and drive the clamping base to move towards the positioning groove through the guide shaft. The measurement system is provided with the CMM measurement auxiliary clamp, and the CMM measurement auxiliary clamp is convenient for fixing and keeping a special-shaped workpiece in a set detection posture, and improves the detection efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of measurement technology, specifically, relate to a CMM measurement auxiliary fixture and the measurement system with the CMM measurement auxiliary fixture. BACKGROUND

[0002] In the current industrial manufacturing field, three coordinate measuring machine (CMM) plays a vital role, when measuring the workpiece, the conventional method is to fix the workpiece directly on the workbench of three coordinate measuring machine, but this way for regular shape workpiece, the operation is relatively simple and direct, and can satisfy the basic measurement demand. However, in the face of some workpieces with irregular shape, if directly placing this kind of workpiece on the workbench, will encounter many inconvenience, especially to the fixing problem of special-shaped workpiece, due to the particularity of workpiece shape, the traditional fixing mode is difficult to ensure that the workpiece remains stable during the measurement process, this not only may lead to the inaccuracy of measurement data, and even may cause damage to the workpiece during the measurement process.

[0003] In addition, for some special-shaped workpiece, in order to ensure the convenience of detection process and the accuracy of measurement result, the posture of workpiece needs to be adjusted accurately, for example, make the workpiece in the upright state, for this, the existing operation method is mostly to add a large number of adjusting parts on the workbench of three coordinate measuring machine to realize this purpose, and the method can solve the posture adjustment problem of special-shaped workpiece to a certain extent, but before each use, it needs to spend a lot of time and energy to install the adjusting part, and after the measurement is completed, it is also necessary to disassemble these adjusting parts, this series of cumbersome operation seriously affects the detection efficiency, increases the production cost and time cost. SUMMARY

[0004] In order to solve the above problems, the main purpose of the utility model is to provide a CMM measurement auxiliary fixture which can fix and keep the special-shaped workpiece in the set detection posture and improve the detection efficiency.

[0005] Another purpose of the utility model is to provide a measurement system with the above CMM measurement auxiliary fixture.

[0006] In order to realize the main purpose of the utility model, the utility model provides a CMM measurement auxiliary fixture, wherein, including base, support assembly, positioning seat, clamping seat and locking assembly, support assembly is installed on the base, positioning seat is installed on the support assembly, the first side of positioning seat is equipped with positioning groove, clamping seat is located at the first side of positioning seat, clamping seat is equipped with two or more guide shafts, two or more guide shafts are distributed along the first direction, guide shaft is slidably connected with positioning seat along the first axial direction of itself, clamping position is formed between clamping seat and positioning groove, clamping seat is equipped with clamping position on the guide shaft, the first axial direction is perpendicular to the height direction of CMM measurement auxiliary fixture respectively, locking assembly includes locking auxiliary plate and locking bolt, locking auxiliary plate is equipped with two or more open slots, open slot penetrates locking auxiliary plate in the first axial direction, one guide shaft passes through one open slot, open slot and the clamping position on the guide shaft that passes through itself are clamped and connected, locking bolt is installed on locking auxiliary plate, the screw end of locking bolt can abut with the second side of positioning seat and drive clamping seat to move towards positioning groove through guide shaft.

[0007] From the above, positioning seat, clamping seat and locking assembly cooperate to clamp and fix the measured workpiece, so that the measured workpiece can be clamped and fixed in a set posture, thereby facilitating the measurement of the measured workpiece in this posture by the measurement equipment such as a three-coordinate measuring machine (CMM); at the same time, through the cooperation between positioning seat, clamping seat and locking assembly, the disassembly and assembly time and energy can be better saved, the measurement efficiency can be greatly improved, and the production cost and time cost can be reduced.

[0008] Further, the CMM measurement auxiliary fixture further includes a preliminary positioning assembly, the preliminary positioning assembly includes a support positioning block, the support positioning block is installed on the support assembly, and the support positioning block is located below the clamping position; the top of the support positioning block is provided with a support positioning surface, and / or the support positioning block is provided with a slot extending from the top surface of the support positioning block to the bottom of the support positioning block.

[0009] From the above, the support positioning block can support and position the measured workpiece before the measured workpiece is clamped and fixed, so that the measured workpiece can be accurately clamped and fixed by the positioning seat and the clamping seat and accurately clamped in the clamping groove of the positioning seat, thereby ensuring the position and posture of the measured workpiece after being clamped and fixed.

[0010] Further, the support assembly is provided with a insertion hole and a limiting slot, the insertion hole extends along the height direction, the limiting slot is located at the hole wall of the insertion hole and communicates with the insertion hole, the limiting slot has a vertical slot section and a horizontal slot section, the vertical slot section is parallel to the height direction, and the horizontal slot section is perpendicular to the vertical slot section and communicates with the vertical slot section; the bottom of the support positioning block is provided with a sliding shaft extending along the height direction, the sliding shaft is slidingly inserted into the insertion hole, the sliding shaft is provided with a limiting pin, the limiting pin penetrates through the limiting slot and can switch positions between the vertical slot section and the horizontal slot section; the initial positioning assembly further comprises a first elastic member, the first elastic member is installed in the insertion hole, and the first elastic member is connected between the support assembly and the sliding shaft, so that the support positioning block is forced to move towards the positioning seat.

[0011] As can be seen from the above, the design enables the support positioning block to be separated from the bottom of the measured workpiece when the measured workpiece is clamped and fixed, so that the support positioning block does not interfere with the measurement when the bottom of the measured workpiece needs to be measured.

[0012] Further, the support assembly comprises a fixed frame and a movable support plate, the fixed frame is installed on the base, the fixed frame is arranged in a U shape, the movable support plate is rotationally connected with the fixed frame, the movable support plate is arranged in a U shape, the movable support plate is located in the U-shaped mouth of the fixed frame, and the insertion hole and the limiting slot are formed on the movable support plate.

[0013] As can be seen from the above, the design enables the support positioning block to be separated from the bottom of the measured workpiece when the measured workpiece is clamped and fixed, so that the support positioning block does not interfere with the measurement when the bottom of the measured workpiece needs to be measured.

[0014] Further, the CMM measurement auxiliary fixture further comprises a fine adjustment assembly, the fine adjustment assembly comprises a first supporting plate, a second supporting plate, a second elastic member and a micrometer head, the first supporting plate is installed on the base, the first supporting plate is provided with a first supporting pin, the second supporting plate is installed on the base, in the first axial direction, the support assembly is located between the first supporting plate and the second supporting plate, the second elastic member is sleeved on the first supporting pin, the second elastic member abuts between the first supporting plate and the first side of the movable support plate, and the micrometer head is installed on the second supporting plate, the micrometer rod of the micrometer head extends along the first axial direction and abuts against the second side of the movable support plate.

[0015] As can be seen from the above, the design enables the support positioning block to be separated from the bottom of the measured workpiece when the measured workpiece is clamped and fixed, so that the support positioning block does not interfere with the measurement when the bottom of the measured workpiece needs to be measured.

[0016] Further, the first elastic member and the second elastic member are both compression springs; a linear bearing is arranged between the guide shaft and the positioning seat; the movable support plate is provided with a second supporting pin, the second supporting pin extends towards the first supporting plate along the first axial direction, a part of the second elastic member is sleeved on the second supporting pin, and the micrometer rod abuts against the second supporting pin.

[0017] From the above, through the design of the first elastic member and the second elastic member, the first elastic member can stably and reliably force the supporting positioning block to move to the clamping position, and the second elastic member can stably and reliably cooperate with the probe to adjust the posture of the measured workpiece; the design of the second supporting nail can avoid pushing the movable support plate between the probes, so as to slow down the wear speed of the movable support plate, and the second supporting nail can also support the end of the second elastic member away from the first supporting nail, so as to better avoid the bending deformation of the second elastic member, thereby ensuring the reliability and stability of the second elastic member pushing the movable support plate.

[0018] Further, the CMM measurement auxiliary fixture further comprises a locking assembly, the locking assembly is in threaded connection with the fixed frame, the locking assembly is abuttable with the movable support plate, and an axis of the locking assembly is parallel to a rotation axis of the movable support plate.

[0019] From the above, the locking assembly can be used to assist in locking the movable support plate, so that the movable support plate is relatively fixed with the fixed frame during the measurement.

[0020] Further, the base is provided with a connecting hole, and / or the bottom of the base is provided with a dovetail guide rail part or a reverse T-shaped guide rail part.

[0021] From the above, the base is convenient for quick and reliable connection with the workbench of the measurement equipment or the guide rail groove plate installed on the workbench.

[0022] In order to realize another purpose of the utility model, the utility model provides a measurement system, comprising a measurement equipment, wherein, further comprising the above CMM measurement auxiliary fixture, and the CMM measurement auxiliary fixture is installed on the workbench of the measurement equipment.

[0023] From the above, the measurement system is provided with the above CMM measurement auxiliary fixture, so that the disassembly of the measured workpiece is more convenient, easy to operate and time-saving and labor-saving when the measured workpiece is measured, which is favorable for greatly improving the measurement efficiency and reducing the production cost and time cost.

[0024] Further, the measurement system further comprises a guide rail groove plate, the guide rail groove plate is provided with a dovetail guide groove and / or a reverse T-shaped guide groove, the guide rail groove plate is detachably installed on the workbench, and the CMM measurement auxiliary fixture is detachably installed on the guide rail groove plate.

[0025] From the above, the setting of the guide rail groove plate makes the CMM measurement auxiliary fixture more convenient to install on the workbench, and is favorable for the disassembly of the measurement equipment and other CMM measurement auxiliary fixtures of measured products. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1It is the use state reference drawing of the CMM measurement auxiliary fixture embodiment of the utility model.

[0027] Figure 2 It is the structure drawing of the CMM measurement auxiliary fixture embodiment of the utility model.

[0028] Figure 3 It is the structure drawing of the CMM measurement auxiliary fixture embodiment of the utility model after the first omitted partial assembly.

[0029] Figure 4 It is the structure drawing of the CMM measurement auxiliary fixture embodiment of the utility model after the second omitted partial assembly.

[0030] The utility model is further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0031] CMM measurement auxiliary fixture embodiment

[0032] Referring to Figure 1 and Figure 2 , the CMM measurement auxiliary fixture 100 comprises a base 1, a support assembly 2, a positioning seat 3, a clamping seat 4, a locking assembly 5, a preliminary positioning assembly 6, a fine adjustment assembly 7 and a locking assembly 8. Wherein, the bottom of the base 1 is preferably provided with a guide rail part 11, which is preferably a dovetail guide rail part; by setting the guide rail part 11 on the bottom of the base 1, when the CMM measurement auxiliary fixture 100 is placed on the workbench of the measuring equipment

such as a three-coordinate measuring machine (CMM)

[0033] In combination with Figure 3The support assembly 2 is installed on the base 1; preferably, the support assembly 2 comprises a fixed frame 21 and a movable support plate 22, the fixed frame 21 is installed on the top of the base 1, and the fixed frame 21 is preferably arranged in a U shape. The movable support plate 22 is rotationally connected with the fixed frame 21, and the movable support plate 22 is also preferably arranged in a U shape; wherein the movable support plate 22 is located in the U-shaped mouth of the fixed frame 21, thereby facilitating the reduction of the volume of the CMM auxiliary fixture 100, and the U-shaped mouth of the movable support plate 22 can be used to accommodate the workpiece 10 to be measured, which also facilitates the reduction of the volume of the CMM auxiliary fixture 100. Through the above design of the support assembly 2, the attitude of the workpiece 10 to be measured can be fine-tuned through the support assembly 2, such as by adjusting the rotation of the movable support plate 22 relative to the fixed frame 21, thereby facilitating to ensure that the top surface of the workpiece 10 to be measured is in a horizontal state or a desired position state, so as to ensure the measurement accuracy of the three-coordinate measuring machine.

[0034] The positioning seat 3 is installed on the movable support plate 22 of the support assembly 2, and is preferably located at the top of the movable support plate 22. The first side of the positioning seat 3 is provided with a positioning groove 31, which preferably penetrates the positioning seat 3 in the height direction of the small CMM auxiliary fixture 100.

[0035] In combination with Figure 4 The clamping seat 4 is provided with two or more guide shafts 41 distributed along a first direction; in this embodiment, the number of guide shafts 41 is two, and the first direction is preferably parallel to the rotation axis of the movable support plate 22, and the first axial direction of the guide shaft 41, the height direction of the CMM auxiliary fixture 100 and the rotation axis of the movable support plate 22 are preferably perpendicular to each other. The guide shaft 41 is slidably connected with the positioning seat 3 along its first axial direction, and the clamping seat 4 is located on the first side of the positioning seat 3, so that a clamping position is formed between the clamping seat 4 and the positioning groove 31.

[0036] Preferably, a linear bearing is provided between the guide shaft 41 and the positioning seat 3 to enable the guide shaft 41 to smoothly slide relative to the positioning seat 3. In addition, the guide shaft 41 is provided with a detent 411, which is preferably an annular groove recessed from the outer wall of the guide shaft 41 to the axis of the guide shaft 41, and the detent 411 is located on the opposite sides of the positioning seat 3 from the clamping position.

[0037] The locking assembly 5 comprises a locking auxiliary plate 51 and a locking bolt 52, the locking auxiliary plate 51 is provided with two or more open grooves 511 penetrating the locking auxiliary plate 51 in the first axial direction of the guide shaft 41, wherein the number of open grooves 511 is equal to the number of guide shafts 41; the locking bolt 52 is installed on the locking auxiliary plate 51.

[0038] When the workpiece 10 to be measured is mounted on the CMM measuring auxiliary fixture 100, the part of the workpiece 10 that mates with the slot 31 on the positioning seat 3 is placed in the slot 31. Then, the locking auxiliary plate 51 is assembled onto the guide shaft 41. During assembly, one guide shaft 41 passes through an open slot 511, and the open slot 511 engages with the locking position 411 on the guide shaft 41 that passes through it, to prevent the locking auxiliary plate 51 from moving along the guide shaft 41. Next, the clamping seat 4 is controlled to fit against the workpiece 10 to be measured, and the locking bolt 52 is adjusted so that the end of its screw can abut against the second side of the positioning seat 3 and drive the clamping seat 4 to move towards the positioning slot 31 through the guide shaft 41, so that the clamping seat 4, together with the positioning seat 3 and the locking assembly 5, clamps and fixes the workpiece 10 to be measured on the CMM measuring auxiliary fixture 100.

[0039] When it is necessary to disassemble the workpiece 10 to be measured, the locking bolt 52 of the locking assembly 5 is adjusted, and the locking auxiliary plate 51 is removed (this step can also be omitted), so that the clamping seat 4 moves relative to the positioning seat 3 to release the workpiece 10 to be measured. It can be seen that the positioning seat 3, the clamping seat 4 and the locking assembly 5 cooperate to clamp and fix the workpiece 10 to be measured, so that the workpiece 10 to be measured can be clamped and fixed in a set posture, thereby facilitating the measurement equipment [such as a coordinate measuring machine (CMM)] to measure the workpiece 10 to be measured in this posture; compared with the traditional method of using adjustment parts to assist in adjusting the posture of the workpiece 10 to be measured, this CMM measurement auxiliary fixture 100 can better save disassembly and assembly time and effort, greatly improve measurement efficiency, and reduce production costs and time costs.

[0040] like Figures 1 to 3 As shown, the initial positioning component 6 includes a support positioning block 61, which is mounted on the movable support plate 22 of the support component 2 and is located below the clamping position. The support positioning block 61 has a support positioning surface 611 on its top and / or a slot 612 extending from the top to the bottom of the support positioning block 61. The support positioning block 61 supports and positions the workpiece 10 before it is clamped and fixed, ensuring that the workpiece 10 is accurately clamped and fixed by the positioning seat 3 and the clamping seat 4 and accurately locked in the slot 31 of the positioning seat 3, thereby ensuring the accurate position and orientation of the workpiece 10 after clamping and fixing.

[0041] Preferably, the movable support plate 22 of the support assembly 2 is provided with a socket 221 and a limiting slot 222, wherein the socket 221 extends from the bottom of the U-shaped mouth of the movable support plate 22 to the base 1 in the height direction of the CMM measurement auxiliary jig 100, the limiting slot 222 is located at the hole wall of the socket 221 and communicates with the socket 221, and the limiting slot 222 penetrates through one side of the movable support plate 22. The limiting slot 222 has a vertical slot section 2221 and a horizontal slot section 2222, the vertical slot section 2221 is parallel to the height direction of the CMM measurement auxiliary jig 100, the horizontal slot section 2222 is perpendicular to the vertical slot section 2221 and communicates with the vertical slot section 2221, and preferably, the limiting slot 222 is L-shaped. Correspondingly, the bottom of the support positioning block 61 is provided with a sliding shaft 613 extending in the height direction of the CMM measurement auxiliary jig 100, the sliding shaft 613 is slidingly inserted into the socket 221, and the sliding shaft 613 is provided with a limiting pin 6131 penetrating through the limiting slot 222 and capable of switching positions between the vertical slot section 2221 and the horizontal slot section 2222; the preliminary positioning assembly 6 further includes a first elastic member, the first elastic member is installed in the socket 221, the first elastic member is connected between the support assembly 2 and the sliding shaft 613, and the first elastic member forces the support positioning block 61 to move towards the positioning seat 3. This design enables the support positioning block 61 to be separated from the bottom of the measured workpiece 10 after the measured workpiece 10 is clamped and fixed, so that the support positioning block 61 does not interfere with the measurement when the bottom of the measured workpiece 10 needs to be measured, by operating the limiting pin 6131 to cooperate with the horizontal slot section 2222 of the limiting slot 222. Preferably, the first elastic member is a compression spring, and the first elastic member can stably and reliably force the support positioning block 61 to move to the clamping position.

[0042] The fine adjustment assembly 7 includes a first supporting plate 71, a second supporting plate 72, a second elastic member 73 and a micrometer head 74, the first supporting plate 71 and the second supporting plate 72 are both installed on the base 1, and the first supporting plate 71 and the second supporting plate 72 are located on both sides of the support assembly 2 at the first axial direction of the guide shaft 41. The first supporting plate 71 is provided with a first supporting nail 711, the second elastic member 73 is sleeved on the first supporting nail 711, and the second elastic member 73 abuts between the first supporting plate 71 and the first side of the movable support plate 22; the micrometer head 74 is installed on the second supporting plate 72, and the micrometer rod of the micrometer head 74 extends along the first axial direction and abuts against the second side of the movable support plate 22. This design can realize accurate fine adjustment of the movable support plate 22, so that the measured workpiece 10 can be accurately in a set posture.

[0043] Further, the second elastic member 73 is a compression spring, so that the second elastic member 73 can stably and reliably cooperate with the micrometer head 74 to adjust the posture of the measured workpiece 10.

[0044] Further, the second supporting nail 223 is arranged on the movable support plate 22 and extends along the first axial direction towards the first supporting plate 71, and a part of the second elastic member 73 is sleeved on the second supporting nail 223, and the microlens rod is in abutment with the second supporting nail 223. This design can avoid the microlens head 74 from pushing the movable support plate 22, so as to slow down the wear speed of the movable support plate 22, and the second supporting nail 223 can also support the end of the second elastic member 73 away from the first supporting nail 711, so as to better avoid the bending deformation of the second elastic member 73, thereby ensuring the reliability and stability of the second elastic member 73 in pushing the movable support plate 22.

[0045] The locking assembly 8 is threadedly connected with the fixing frame 21, and the locking assembly 8 is in abutment with the movable support plate 22, wherein the axis of the locking assembly 8 is parallel to the rotation axis of the movable support plate 22. The locking assembly 8 can be used to assist in locking the movable support plate 22, so that the movable support plate 22 is relatively fixed with the fixing frame 21 during the measurement.

[0046] As can be seen from the above, through the design of the CMM measurement auxiliary clamp 100, the measured workpiece 10 can be quickly disassembled and assembled when the CMM measurement auxiliary clamp 100 is matched with the measuring device to measure the measured workpiece 10, and the disassembly and assembly are more convenient, time-saving and labor-saving, which is conducive to greatly improving the measurement efficiency and reducing the production cost and time cost.

[0047] Measurement system embodiment

[0048] The measurement system comprises a measuring device (such as a three-coordinate measuring machine (CMM)) and the CMM measurement auxiliary clamp described in the above CMM measurement auxiliary clamp embodiment, and the CMM measurement auxiliary clamp is installed on the workbench of the measuring device. Through the arrangement of the CMM measurement auxiliary clamp, the disassembly and assembly of the measured workpiece are more convenient, easy to operate and time-saving and labor-saving when the measured workpiece is measured, which is conducive to greatly improving the measurement efficiency and reducing the production cost and time cost.

[0049] Preferably, the measurement system further comprises a guide rail groove plate, the guide rail groove plate is provided with a dovetail guide groove and / or an inverted T-shaped guide groove; the guide rail groove plate is detachably installed on the workbench, and the CMM measurement auxiliary clamp is detachably installed on the guide rail groove plate. The arrangement of the guide rail groove plate makes it more convenient to install the CMM measurement auxiliary clamp on the workbench, and is conducive to the disassembly and assembly of the measuring device and other CMM measurement auxiliary clamps of measured products.

[0050] Finally, it should be emphasized that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A CMM measurement aid fixture, characterized by, The utility model relates to a CMM (Coordinate Measuring Machine) auxiliary fixture, comprising: a base; a support assembly mounted on the base; a positioning seat mounted on the support assembly, a first side of the positioning seat being provided with a positioning groove; a clamping seat located at the first side of the positioning seat, the clamping seat being provided with two or more guide shafts, the two or more guide shafts being distributed along a first direction, the guide shafts being slidably connected to the positioning seat along a first axis of the guide shafts, a clamping position being formed between the clamping seat and the positioning groove, the guide shafts being provided with a clamping position, the first axis being perpendicular to the first direction and a height direction of the CMM auxiliary fixture; a locking assembly comprising a locking auxiliary plate and a locking bolt, the locking auxiliary plate being provided with two or more opening grooves, the opening grooves penetrating through the locking auxiliary plate along the first axis, one of the guide shafts penetrating through one of the opening grooves, the opening grooves being clamped and connected to the clamping position of the guide shafts, the locking bolt being mounted on the locking auxiliary plate, a screw end of the locking bolt being abuttable to a second side of the positioning seat and capable of driving the clamping seat to move towards the positioning groove through the guide shafts.

2. The CMM auxiliary fixture according to claim 1, further comprising a preliminary positioning assembly, the preliminary positioning assembly comprising a support positioning block, the support positioning block being mounted on the support assembly, the support positioning block being located below the clamping position.

3. The CMM auxiliary fixture according to claim 2, wherein: the support assembly is provided with an insertion hole and a limiting groove, the insertion hole extending along a height direction, the limiting groove being located at a hole wall of the insertion hole and being in communication with the insertion hole, the limiting groove having a vertical groove section and a horizontal groove section, the vertical groove section being parallel to the height direction, the horizontal groove section being perpendicular to the vertical groove section and being in communication with the vertical groove section; a sliding shaft extending along the height direction is formed on a bottom of the support positioning block, the sliding shaft being slidably inserted into the insertion hole, a limiting pin being formed on the sliding shaft, the limiting pin penetrating through the limiting groove and being capable of switching positions between the vertical groove section and the horizontal groove section; the preliminary positioning assembly further comprises a first elastic member, the first elastic member being mounted in the insertion hole, the first elastic member being connected between the support assembly and the sliding shaft, the first elastic member forcing the support positioning block to move towards the positioning seat.

4. The CMM auxiliary fixture according to claim 3, wherein: the support assembly comprises: a fixed frame mounted on the base, the fixed frame being provided in a U shape; a movable support plate rotatably connected to the fixed frame, the movable support plate being provided in a U shape, the movable support plate being located in a U-shaped opening of the fixed frame, the insertion hole and the limiting groove being formed on the movable support plate. ​ ​ ​ 5. The CMM measurement auxiliary fixture according to claim 4, characterized in that: the CMM measurement auxiliary fixture further comprises a fine adjustment assembly, the fine adjustment assembly comprises: a first supporting plate, the first supporting plate is installed on the base, the first supporting plate is provided with a first supporting pin; a second supporting plate, the second supporting plate is installed on the base, the supporting assembly is located between the first supporting plate and the second supporting plate in the first axial direction; a second elastic member, the second elastic member is sleeved on the first supporting pin, the second elastic member abuts between the first supporting plate and the first side of the movable supporting plate; a micrometer head, the micrometer head is installed on the second supporting plate, the micrometer rod of the micrometer head extends along the first axial direction and abuts against the second side of the movable supporting plate.

6. The CMM measurement auxiliary fixture according to claim 5, characterized in that: the first elastic member and the second elastic member are both compression springs; a linear bearing is provided between the guide shaft and the positioning seat; the movable supporting plate is provided with a second supporting pin, the second supporting pin extends towards the first supporting plate along the first axial direction, a part of the second elastic member is sleeved on the second supporting pin, and the micrometer rod abuts against the second supporting pin.

7. The CMM measurement auxiliary fixture according to claim 4, characterized in that: the CMM measurement auxiliary fixture further comprises a locking assembly, the locking assembly is threadedly connected with the fixed frame, the locking assembly can abut against the movable supporting plate, and an axis of the locking assembly is parallel to the rotation axis of the movable supporting plate.

8. The CMM measurement auxiliary fixture according to any one of claims 1 to 7, characterized in that: the base is provided with a connecting hole; and / or a dovetail guide rail part or an inverted T-shaped guide rail part is provided on the bottom of the base.

9. Measuring system comprising a measuring device, characterized in that The CMM measurement auxiliary fixture according to any one of claims 1 to 8 is further included, and the CMM measurement auxiliary fixture is installed on a workbench of the measuring device.

10. The measuring system according to claim 9, characterized in that: the measuring system further comprises a guide rail groove plate, the guide rail groove plate is provided with a dovetail guide groove and / or an inverted T-shaped guide groove; the guide rail groove plate is detachably installed on the workbench, and the CMM measurement auxiliary fixture is detachably installed on the guide rail groove plate.

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