Measuring fixtures and measuring systems

Abstract

The present invention provides a measuring fixture, including a product support plate and a plurality of supporting feet fixed at the corners of the product support plate; the product support plate is provided with a plurality of installation cavities, and an insert fixing plate and a pin fixing plate are sequentially provided on the side of the product support plate close to the supporting feet. The insert fixing plate and the installation cavity are respectively provided with measuring insert assemblies at positions corresponding to the insert fixing plate, and the measuring insert assemblies include two measuring inserts arranged in the installation cavities. The pin fixing plate and the measurement insert assembly are respectively provided with pins at positions corresponding to the measuring insert assemblies. A driving device is connected to the product support plate, and the driving device is used to drive the pin fixing plate and drive the pins to move in the vertical direction of the product support plate. A measuring system is also provided, including the above-mentioned measuring fixture. The measuring fixture provided by the present invention can automatically clamp all buckles, and its measuring system has high measurement accuracy and fast speed, reduces manual operations, and saves production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping fixtures and measuring equipment, and in particular to a measuring fixture and a measuring system. Background Art

[0002] At present, the metal back panels of stamped and bent keyboards are mostly measured by a combination of manual and jig measurement methods. Usually, operators use plug gauges, special gauge blocks or calipers to measure manually. Due to the small area of ​​a single key position and the large number of buckles, irregular shapes and positions, small tolerances, and interference from hooks on the top of the buckles, and the uneven measurement levels of operators, large errors often occur, low measurement accuracy, and a very cumbersome measurement process, long measurement time, and low work efficiency. Summary of the invention

[0003] Based on this, the present invention provides a measuring fixture and a measuring system. The measuring fixture can automatically clamp all buckles. The measuring system has high measurement accuracy and high speed, reduces manual operations, and saves production costs.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A measuring fixture, comprising a product support plate and a plurality of support legs fixed at the corners of the product support plate; the product support plate is provided with a plurality of mounting cavities, and an insert fixing plate and a pin fixing plate are sequentially arranged on one side of the product support plate close to the support legs; the insert fixing plate is fixedly connected to the product support plate, and the pin fixing plate is slidably connected to the product support plate and the insert fixing plate respectively;

[0006] The positions of the insert fixing plate and the installation cavity corresponding to each other are respectively provided with measuring insert assemblies, the measuring insert assemblies include two measuring inserts, the two measuring inserts are respectively provided with measuring feet, and the two measuring inserts are arranged in the corresponding installation cavity;

[0007] Pins are respectively arranged at positions corresponding to the pin fixing plate and the measuring insert assembly, and one end of the pin close to the supporting foot is fixedly connected to the pin fixing plate;

[0008] A driving device is fixedly connected to one side of the product support plate close to the supporting foot, and a driving end of the driving device is fixedly connected to the pin fixing plate, and the driving device can drive the pin fixing plate to reciprocate along the vertical direction of the product support plate; when the pin fixing plate moves toward the direction approaching the insert fixing plate, it drives the pins to move together, and the pins can be inserted between the two measuring inserts to move the two measuring inserts away from each other; when the pin fixing plate moves toward the direction away from the insert fixing plate, it drives the pins to move together, and the pins withdraw from between the two measuring inserts, and the two inserts move toward each other.

[0009] Further improvements to the above technical solution are:

[0010] The driving device includes two groups of cylinder devices and pneumatic valves respectively connected to the pipelines of the two groups of cylinder devices. The two groups of cylinder devices are respectively arranged near the two ends of the length direction of the product support plate; each group of cylinder devices includes a cylinder fixedly connected to the product support plate, and a pull block respectively connected to the cylinder and the pin fixing plate.

[0011] Buffers are respectively provided near both ends of the pin fixing plate in the length direction. The buffer is detachably connected to the pin fixing plate, and the relative position of the buffer and the pin fixing plate is adjustable. A buffer pad is provided at the end of the buffer close to the product support plate.

[0012] The pin fixing plate is fixedly connected with a plurality of equal-height screws on one side facing the insert fixing plate, and the equal-height screws include a screw nut and a screw rod; a first screw hole is provided on the insert fixing plate at a position corresponding to the equal-height screw, and a second screw hole is provided on the product support plate at a position corresponding to the equal-height screw, and the second screw hole is a stepped hole, and the stepped hole includes a first hole away from the insert fixing plate and a second hole close to the insert fixing plate, and the diameter of the first hole is larger than the diameter of the second hole; the screw rod is fixedly connected to the pin fixing plate after passing through the second screw hole and the first screw hole in sequence, and the screw nut is located on the side of the second hole away from the insert fixing plate.

[0013] The insert fixing plate is respectively provided with a plurality of product rough positioning holes and a plurality of product fine positioning holes, wherein a rough positioning pin is arranged in the rough positioning hole, and a fine positioning pin is arranged in the fine positioning hole.

[0014] A safety cover is fixedly connected to one side of the insert fixing plate close to the supporting foot, and the safety cover is arranged around the insert fixing plate.

[0015] The two measuring inserts are connected to the insert fixing plate via an insert fixing seat, and the insert fixing seat is arranged between the two measuring inserts. Two insert guide pins are provided on the insert fixing seat, and the two measuring inserts can move towards or away from each other along the two insert guide pins; spring mounting holes are respectively provided on the end surfaces of the two measuring inserts away from each other, and springs are respectively provided in the spring mounting holes, one end of the spring abuts against the spring mounting hole, and the other end abuts against the side wall of the mounting cavity.

[0016] It also includes a glass cover plate, which is arranged on a side of the product support plate away from the support foot. The product support plate is provided with a cover plate positioning hole, a cover plate positioning pin is provided in the cover plate positioning hole, and a cover plate hole is provided at a position of the glass cover plate corresponding to the cover plate positioning pin.

[0017] The pin fixing plate is provided with a plurality of guide sleeve mounting holes, in which guide sleeves are fixedly arranged, and the insert fixing plate is fixedly provided with guide posts at positions corresponding to the guide sleeves, and the guide posts are passed through the guide sleeves.

[0018] The present invention further provides a measuring system, comprising the above-mentioned measuring fixture and an image measuring device, wherein a workbench is provided on the image measuring device, and the workbench is used to place the measuring fixture.

[0019] It can be seen from the technical solution of the present invention that the measuring fixture of the present invention has a plurality of installation cavities on its product support plate, each of which corresponds to a key position of a keyboard, and the pins on the pin fixing plate are driven up and down by a driving device, so that the measuring inserts move in a direction of approaching or moving away from each other, clamping or loosening the buckles to be measured, and it can clamp all the buckles of the workpiece 200 to be measured at one time. The measuring system of the present invention measures the measuring points on the measuring feet of the clamped workpiece through an image measuring device, thereby measuring the size of the workpiece 200 to be measured, and has a fast measuring speed and high precision, and the production efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the overall structure of the measuring fixture according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the structure of a workpiece to be tested according to an embodiment of the present invention.

[0022] Figure 3 The figure is a schematic diagram of the exploded structure of the measuring fixture according to the embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the assembly structure of the insert fixing plate and the pin fixing plate according to an embodiment of the present invention.

[0024] Figure 5It is a schematic diagram of the structure of the insert assembly and the pin according to an embodiment of the present invention.

[0025] Figure 6 It is a schematic structural diagram of an insert fixing plate according to an embodiment of the present invention.

[0026] Figure 7 The figure is a schematic diagram of the installation of the pin fixing plate and the pins according to the embodiment of the present invention.

[0027] The meanings of the symbols in the accompanying drawings are:

[0028] 100-measuring fixture; 200-workpiece to be measured; 101-glass cover; 102-safety cover; 103-supporting foot; 104-driving device; 105-product support plate; 106-insert fixing plate; 107-pin fixing plate; 1011-cover plate hole; 1012-pin hole; 1041-pneumatic valve; 1042-pipeline; 1043-pull block; 1044-cylinder; 1051-cover plate positioning hole; 1052-installation cavity; 1053-fine positioning hole; 1054-rough positioning hole; 1061-cover plate positioning pin; 1062-rough positioning pin; 1063-fine positioning pin; 1064-measuring insert assembly; 1065-first light transmission hole; 1071- Equal height screws; 1072-guide sleeve; 1073-guide column; 1074-pin; 1075-second light transmission hole; 10641-insert fixing seat; 10642-measuring insert; 10643-column; 10644-gauge block; 10645-insert guide pin; 10646-spring; 10741-needle rod; 10742-bottom block; 201-clip. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] like Figure 1 , Figures 3 to 6 As shown, it is a schematic structural diagram of a measuring fixture 100 according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of a workpiece 200 to be tested according to an embodiment of the present invention.

[0033] Embodiment 1, as shown in the figure, the measuring fixture 100 of this embodiment includes a product support plate 105 and four supporting feet 103 fixed at the corners of the product support plate 105, the supporting feet 103 are used to support the measuring fixture 100, and the product support plate 105 is used to place the workpiece 200 to be measured. The product support plate 105 is provided with a plurality of installation cavities 1052 that penetrate the product support plate 105, and the number and position of the installation cavities 1052 correspond to the buckles 201 to be measured of the workpiece 200 to be measured. The side of the product support plate 105 close to the supporting feet 103 is provided with an insert fixing plate 106 and a pin fixing plate 107 in sequence; the insert fixing plate 106 is fixedly connected to the product support plate 105 by bolts, and the pin fixing plate 107 is slidably connected to the product support plate 105 and the insert fixing plate 106, respectively.

[0034] like Figures 3 to 6 As shown, the positions of the insert fixing plate 106 corresponding to the installation cavity 1052 are respectively provided with measuring insert assemblies 1064, and the measuring insert assemblies 1064 include two measuring inserts 10642, and the two measuring inserts 10642 are respectively provided with measuring feet, and the measuring feet respectively include a column 10643 fixedly connected to the measuring insert 10642, and a gauge block 10644 vertically arranged with the column 10643, and the gauge blocks 10644 of the two measuring feet are arranged oppositely, and the direction is the same as the movement direction of the measuring insert 10642. The two measuring inserts 10642 are installed in the corresponding installation cavity 1052. An insert fixing seat 10641 is also provided between the two measuring inserts 10642. The insert fixing seat 10641 is fixedly connected to the insert fixing plate 106. Two insert guide pins 10645 are provided in parallel on the insert fixing seat 10641. The two measuring inserts 10642 are inserted on the insert guide pins 10645 and can move in the direction of approaching or moving away from each other along the two insert guide pins 10645. Spring mounting holes are provided on the end faces of the two measuring inserts 10642 that are away from each other. The spring mounting holes are blind holes. Springs 10646 are provided in the spring mounting holes. The springs 10646 are always in a compressed state. One end of the spring 10646 abuts against the spring mounting hole, and the other end abuts against the side wall of the mounting cavity 1052. A through first light-transmitting hole 1065 is provided on the insert fixing plate 106 on both sides of the moving direction of each measuring insert assembly 1064.

[0035] like Figure 3 As shown, the insert fixing plate 106 is provided with two product rough positioning holes 1054 along the length direction of the insert fixing plate 106, and one product rough positioning hole 1054 is provided along the width direction of the insert fixing plate 106, with a total of three product rough positioning holes 1054. A rough positioning pin 1062 is provided in each of the rough positioning holes 1054. The rough positioning pin 1062 protrudes from the insert fixing plate 106 and the product supporting plate 105, and the three product rough positioning holes 1054 correspond to the outer edge of the workpiece 200 to be measured. When the workpiece 200 to be measured is placed on the product supporting plate 105, the three rough positioning pins 1062 are located outside the edge of the workpiece to perform rough positioning on the workpiece. In this embodiment, the insert fixing plate 106 is further provided with three product precision positioning holes 1053, and precision positioning pins 1063 are provided in the precision positioning holes 1053. The precision positioning pins 1063 protrude from the insert fixing plate 106 and the product support plate 105. The positions of the workpiece 200 to be measured corresponding to the precision positioning pins 1063 are respectively provided with product positioning holes. When the workpiece 200 to be measured is placed on the product support plate 105, the product positioning holes are inserted into the precision positioning pins 1063 to accurately position the workpiece 200 to be measured. The positions of the product support plate 105 corresponding to the rough positioning pins 1062 are also provided with coarse positioning holes 1054, and the positions of the product support plate 105 corresponding to the precision positioning pins 1063 are provided with precision positioning holes 1053.

[0036] like Figure 5 and Figure 7 As shown, the positions of the pin fixing plate 107 and the measuring insert assembly 1064 are respectively provided with pins 1074, and the pins 1074 are in an "L" shape, including a bottom block 10742 and a pin rod 10741 vertically arranged with the bottom block 10742, and the thickness of the pin rod 10741 at the end away from the bottom block 10742 gradually decreases, forming a pointed shape. The pin fixing plate 107 is provided with a pin installation hole, and the pin rod 10741 of the pin is inserted from the pin installation hole of the pin fixing plate 107 close to the supporting foot 103. The bottom block 10742 abuts against a side of the pin fixing plate 107 close to the supporting foot 103, and is fixedly connected to the pin fixing plate 107 by bolts. The pins 1074 are respectively provided with second light-transmitting holes 1075 on both sides along the moving direction of the measuring insert 10642.

[0037] like Figure 3 and Figure 4As shown, the pin fixing plate 107 is fixedly connected to a side of the insert fixing plate 106 with a plurality of equal height screws 1071. In this embodiment, five equal height screws 1071 are respectively arranged at the corresponding positions of each long side of the insert fixing plate 106, and two equal height screws 1071 are respectively arranged at the corresponding positions of each short side. The equal height screws 1071 include a screw nut and a screw rod; a first screw hole is arranged at a position of the insert fixing plate 106 corresponding to the equal height screw 1071, and a second screw hole is arranged at a position of the product support plate 105 corresponding to the equal height screw 1071. The second screw hole is a stepped hole, and the stepped hole includes a first hole away from the insert fixing plate 106 and a second hole close to the insert fixing plate 106. The diameter of the first hole is larger than the diameter of the second hole; the screw rod is fixedly connected to the pin fixing plate 107 after passing through the second screw hole and the first screw hole in sequence, and the screw nut is located at a side of the second hole away from the insert fixing plate 106. The contour screws 1071 can play a role in safety limiting the pin fixing plate 107 , and the movement distance of the pin fixing plate 107 away from the insert fixing plate 106 is limited by the stroke of the cylinder 1044 and the contour screws 1071 .

[0038] like Figure 1 and Figure 3As shown, a driving device 104 is fixedly connected to one side of the product support plate 105 close to the supporting foot 103. The driving device 104 includes two groups of cylinder devices and pneumatic valves 1041 respectively connected to the two groups of cylinder devices through pipelines 1042. In this embodiment, the pneumatic valve 1041 is a manual valve, which is arranged in the middle of the two groups of cylinder devices and is fixedly connected to the product support plate 105. The two groups of cylinder devices are respectively arranged near the two ends of the length direction of the product support plate 105; each group of cylinder devices includes a cylinder 1044 fixedly connected to the product support plate 105, and a pull block 1043 respectively connected to the cylinder 1044 and the pin fixing plate 107. The cylinder 1044 includes a cylinder body and a cylinder piston rod, and the cylinder piston rod is fixedly connected to the pull block 1043. The cylinder piston rod drives the pin fixing plate 107 to reciprocate in the vertical direction of the product support plate 105 through the pull block 1043; when the pin fixing plate 107 moves toward the insert fixing plate 106, it drives the pin 1074 to move together, and the pin 1074 can be inserted between the two measuring inserts 10642, forcing the two measuring inserts 10642 to move away from each other along the insert guide pin 10645. When the pin fixing plate 107 moves away from the insert fixing plate 106, it drives the pin 1074 to move together. The pin 1074 withdraws from between the two measuring inserts 10642. The two inserts are acted upon by the restoring force of the spring 10646 and move toward each other along the insert guide pin 10645 until the measuring insert 10642 contacts the insert fixing seat 10641 and stops moving.

[0039] like Figure 4 As shown, in the present embodiment, a guide sleeve mounting hole is respectively provided at the four corners of the pin fixing plate 107, with a total of 4 guide sleeve mounting holes, in which a guide sleeve 1072 is fixedly provided, and a guide column 1073 is fixedly provided at a position corresponding to the guide sleeve 1072 of the insert fixing plate 106, and the guide column 1073 is passed through the guide sleeve 1072, and the guide column 1073 is fixedly connected to the insert fixing plate 106, and can move along the guide sleeve 1072 toward or away from the insert fixing plate 106.

[0040] like Figure 3As shown, the measuring fixture 100 of this embodiment further includes a glass cover plate 101, which is arranged on a side of the product support plate 105 away from the support foot 103. For easy taking, the outer edge of the glass cover plate 101 protrudes from the product support plate 105. A cover plate positioning hole 1051 is respectively provided near both ends of the product support plate 105 in the length direction. A cover plate positioning pin 1061 is provided in the cover plate positioning hole 1051. A cover plate hole 1011 is provided at a position of the glass cover plate 101 corresponding to the cover plate positioning pin 1061. Pin holes 1012 are respectively provided at positions of the glass cover plate 101 corresponding to the rough positioning pin 1062 and the fine positioning pin 1063.

[0041] like Figure 1 and Figure 3 As shown, in this embodiment, a safety cover 102 may be fixedly connected to one side of the insert fixing plate 106 close to the supporting foot 103 , and the safety cover 102 is arranged around the insert fixing plate 106 .

[0042] In this embodiment, a buffer (not shown in the figure) can be respectively provided near both ends of the length direction of the pin fixing plate 107, the buffer is detachably connected to the pin fixing plate 107, and the relative position of the buffer and the pin fixing plate 107 is adjustable, and a buffer pad is provided at the end of the buffer close to the product support plate 105. The buffer and the stroke of the cylinder 1044 jointly limit the moving distance of the pin fixing plate 107 toward the insert fixing plate 106, and a buffer pad is provided on the buffer to avoid strong collision with the insert fixing plate 106.

[0043] The working principle of the measuring fixture 100 of this embodiment is as follows: First, the pneumatic valve 1041 is closed, the piston rods of the two cylinders are retracted, and the pull block 1043 drives the pin fixing plate 107 to move toward the insert fixing plate 106. When the limit is reached, the pin fixing plate 107 stops moving, and each pin 1074 is inserted between the corresponding two measuring inserts 10642. The measuring feet move away from each other with the measuring inserts 10642, so as to facilitate the placement of the workpiece 200 to be measured. Then, the workpiece 200 to be measured is placed on the product support plate 105 and covered with the glass cover plate 101. The glass cover plate 101 allows the workpiece to be laid flat on the product support plate 105, which is conducive to reducing the measurement error. Start the pneumatic valve 1041, the piston rods of the two cylinders extend out, and the pull block 1043 drives the pin fixing plate 107 to move toward the supporting foot 103. When the limit is reached, the pin fixing plate 107 stops moving, and all the pins 1074 are separated from the measuring insert 10642. The two corresponding measuring inserts 10642 of each group move towards each other due to the restoring force of the spring 10646, until each group of measuring feet contacts the measuring point of the workpiece 200 to be measured, and then the measuring insert 10642 stops moving, and the workpiece clamping is completed.

[0044] This embodiment also provides a measurement system, including the above-mentioned measuring fixture 100, and also includes an image measuring device, wherein the image measuring device is provided with a workbench, and the workbench is used to place the measuring fixture 100. The image measuring device also includes a Z axis, a microscope, a CCD, a light source, and an electronic control system.

[0045] After the measuring fixture 100 clamps the workpiece to be measured, the measuring fixture 100 is placed on the workbench as a whole, and the image measuring device is started. The image measuring device collects and measures the sampling point positions at the measuring feet of the measuring fixture 100, thereby measuring the distance size between the positions of the buckles 201 of the workpiece to be measured.

[0046] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A measuring fixture, comprising a product support plate and a plurality of support legs fixed at the corners of the product support plate; characterized in that: The product support plate is provided with a plurality of installation cavities, and an insert fixing plate and a pin fixing plate are sequentially arranged on one side of the product support plate close to the support foot; the insert fixing plate is fixedly connected to the product support plate, and the pin fixing plate is slidably connected to the product support plate and the insert fixing plate respectively; The positions of the insert fixing plate and the installation cavity corresponding to each other are respectively provided with measuring insert assemblies, the measuring insert assemblies include two measuring inserts, the two measuring inserts are respectively provided with measuring feet, and the two measuring inserts are arranged in the corresponding installation cavity; Pins are respectively arranged at positions corresponding to the pin fixing plate and the measuring insert assembly, and one end of the pin close to the supporting foot is fixedly connected to the pin fixing plate; A driving device is fixedly connected to one side of the product support plate close to the supporting foot, and a driving end of the driving device is fixedly connected to the pin fixing plate, and the driving device can drive the pin fixing plate to reciprocate along the vertical direction of the product support plate; when the pin fixing plate moves in a direction close to the insert fixing plate, it drives the pins to move together, and the pins can be inserted between the two measuring inserts, so that the two measuring inserts move in directions away from each other; when the pin fixing plate moves in a direction away from the insert fixing plate, it drives the pins to move together, and the pins withdraw from between the two measuring inserts, and the two inserts move in a direction close to each other; A plurality of equal height screws are fixedly connected to the pin fixing plate on one side facing the insert fixing plate, and the equal height screws include a screw nut and a screw rod; a first screw hole is provided at a position of the insert fixing plate corresponding to the equal height screw, and a second screw hole is provided at a position of the product support plate corresponding to the equal height screw, and the second screw hole is a stepped hole, and the stepped hole includes a first hole away from the insert fixing plate and a second hole close to the insert fixing plate, and the diameter of the first hole is greater than the diameter of the second hole; The screw rod is fixedly connected to the pin fixing plate after passing through the second screw hole and the first screw hole in sequence, and the screw nut is located on the side of the second hole away from the insert fixing plate.

2. The measuring fixture according to claim 1, characterized in that: The driving device includes two groups of cylinder devices and pneumatic valves respectively connected to the pipelines of the two groups of cylinder devices. The two groups of cylinder devices are respectively arranged near the two ends of the length direction of the product support plate; each group of cylinder devices includes a cylinder fixedly connected to the product support plate, and a pull block respectively connected to the cylinder and the pin fixing plate.

3. The measuring fixture according to claim 1, characterized in that: Buffers are respectively provided near both ends of the pin fixing plate in the length direction. The buffer is detachably connected to the pin fixing plate, and the relative position of the buffer and the pin fixing plate is adjustable. A buffer pad is provided at the end of the buffer close to the product support plate.

4. The measuring fixture according to claim 1, characterized in that: The insert fixing plate is respectively provided with a plurality of product rough positioning holes and a plurality of product fine positioning holes, wherein a rough positioning pin is arranged in the rough positioning hole, and a fine positioning pin is arranged in the fine positioning hole.

5. The measuring fixture according to claim 1, characterized in that: A safety cover is fixedly connected to one side of the insert fixing plate close to the supporting foot, and the safety cover is arranged around the insert fixing plate.

6. The measuring fixture according to claim 1, characterized in that: The two measuring inserts are connected to the insert fixing plate via an insert fixing seat, and the insert fixing seat is arranged between the two measuring inserts. Two insert guide pins are provided on the insert fixing seat, and the two measuring inserts can move towards or away from each other along the two insert guide pins; spring mounting holes are respectively provided on the end surfaces of the two measuring inserts away from each other, and springs are respectively provided in the spring mounting holes, one end of the spring abuts against the spring mounting hole, and the other end abuts against the side wall of the mounting cavity.

7. The measuring fixture according to claim 1, characterized in that: It also includes a glass cover plate, which is arranged on a side of the product support plate away from the support foot. The product support plate is provided with a cover plate positioning hole, a cover plate positioning pin is provided in the cover plate positioning hole, and a cover plate hole is provided at a position of the glass cover plate corresponding to the cover plate positioning pin.

8. The measuring fixture according to claim 1, characterized in that: The pin fixing plate is provided with a plurality of guide sleeve mounting holes, in which guide sleeves are fixedly arranged, and the insert fixing plate is fixedly provided with guide posts at positions corresponding to the guide sleeves, and the guide posts are passed through the guide sleeves.

9. A measurement system, characterized in that: The measuring fixture comprises the measuring fixture according to any one of claims 1 to 8, and also comprises an image measuring device, wherein the image measuring device is provided with a workbench, and the workbench is used to place the measuring fixture.

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