Image measuring instrument with auxiliary positioning function

Abstract

The invention discloses an image measuring instrument with an auxiliary positioning function, and relates to the technical field of image measurement, the image measuring instrument comprises a placing frame and further comprises a positioning device, a placing hole is formed in the front side of the placing frame, a light supplementing device is arranged on the inner wall of the placing hole, a fixing rod is fixedly installed on the inner wall of the placing frame, and the positioning device is arranged on the fixing rod. Displacement equipment is slidably mounted on the circumferential surface of the fixing rod, image measurement equipment is arranged on the front side of the displacement equipment, a placement frame is fixedly mounted at the bottom of the inner wall of the placement frame, and the positioning device comprises a positioning groove, an electric push rod, a push plate, a supporting groove, a supporting rod, a supporting plate, a protection groove, a hollow block and a sliding block. The hollow block is limited by the sliding block, so that the push plate cannot continuously move in the direction close to the positioning groove, scraping and indentation on the surface of the workpiece can be reduced through reasonable clamping force, it can be ensured that the workpiece is kept at the stable position in the measuring process, and displacement or inclination caused by improper clamping is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of image measurement, in particular to an image measuring instrument with an auxiliary positioning function. Background Art

[0002] An image measuring instrument with auxiliary positioning function usually consists of an image measuring instrument body, a positioning device, a fill light device, a protective device and a limit device.

[0003] The patent with the patent announcement number CN217818730U relates to an image measuring instrument with auxiliary positioning function, and relates to the technical field of image measuring instruments. The image measuring instrument with auxiliary positioning function includes a body, the upper side of the body is fixedly connected to an operating table, an adjustment device is arranged inside the operating table, the upper end of the support frame is fixedly connected to a cross frame, the lower side of the cross frame is fixedly connected to a hydraulic cylinder, the end of the hydraulic cylinder away from the cross frame is fixedly connected to the image measuring instrument body, and a clamping device is arranged above the operating table. Through the use of the adjustment device, the patent enables the device to adjust the measuring table to a horizontal position when local unevenness occurs, thereby reducing the error of the image measuring instrument when measuring objects, making the measurement results more accurate, and through the use of the clamping device, objects of different sizes can be clamped quickly, saving working time.

[0004] In the above patent, by using the clamping device, objects of different sizes can be clamped quickly, saving working time, but it is difficult to prevent over-clamping of the workpiece. The workpiece will deform under excessive clamping force, resulting in dimensional deviation, thereby affecting the accuracy of the measurement results. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an image measuring instrument with an auxiliary positioning function, which solves the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention is implemented through the following technical solutions: an image measuring instrument with auxiliary positioning function, including a placement frame and a positioning device, wherein a placement hole is opened on the front side of the placement frame, a fill light device is arranged on the inner wall of the placement hole, a fixing rod is fixedly installed on the inner wall of the placement frame, a displacement device is slidably installed on the circumferential surface of the fixing rod, an image measuring device is arranged on the front side of the displacement device, and a placement frame is fixedly installed on the bottom of the inner wall of the placement frame, wherein the positioning device includes a positioning groove, an electric push rod, a push plate, a support groove, a support rod, a support plate, a protective groove, a hollow block and a slider, and the hollow block moves downward The slider is driven to move downward, and the slider moves downward to contact the protective groove and limit the hollow block. The hollow block is limited by the slider so that the push plate cannot continue to move in the direction close to the positioning groove. The positioning groove is arranged on the left side of the inner wall of the placement frame, and the electric push rod is fixedly penetrated through the inner and outer walls of the placement frame. The push plate is fixedly installed at the output end of the electric push rod, the support groove is arranged on the left side of the push plate, and the support rod slides through the left and right walls of the support groove, and the support plate is fixedly installed on the side of the support rod close to the positioning groove. The protective groove is arranged at the bottom of the inner wall of the placement frame, the hollow block is slidably installed on the right side of the push plate, and the slider is slidably installed on the inner wall of the hollow block.

[0007] According to the above technical solution, a No. 1 spring is arranged between the support groove and the support rod, and the No. 1 spring can drive the support rod to reset. The side of the hollow block close to the support rod is set as an inclined surface, and the hollow block is in contact with the support rod.

[0008] According to the above technical solution, a No. 2 spring is arranged between the hollow block and the slider, one end of the No. 2 spring is arranged on the top of the slider, and the other end is arranged on the inner wall of the hollow block. The slider can be driven to reset by the No. 2 spring, and the bottom of the slider is arranged as an inclined surface. A No. 3 spring is arranged between the hollow block and the push plate, one end of the No. 3 spring is arranged on the right side of the push plate, and the other end is arranged on the surface of the hollow block. The hollow block can be driven to reset by the No. 3 spring.

[0009] According to the above technical solution, an auxiliary device for secondary correction of the workpiece is provided on the surface of the push plate, and a protective device is provided on the top of the push plate. The auxiliary device includes a stabilizing hole, an L-shaped rod, a connecting rod, a U-shaped rod, a load-bearing rod and a fixing ring. The load-bearing rod moves in the direction close to the hollow block to drive the L-shaped rod to move. The L-shaped rod moves in the direction close to the hollow block to contact the side of the workpiece and correct the position of the workpiece. The stabilizing hole is opened on the surface of the push plate, and the load-bearing rod slides through the surface of the push plate. The L-shaped rod is fixedly installed on the circumferential surface of the load-bearing rod, the connecting rod is fixedly installed on the right side of the push plate, the U-shaped rod is fixedly installed on the side of the L-shaped rod away from the connecting rod, and the fixing ring is fixedly installed on the circumferential surface of the load-bearing rod.

[0010] According to the above technical solution, a load-bearing spring is arranged between the load-bearing rod and the push plate, and the load-bearing spring can drive the load-bearing rod to reset. The end of the L-shaped rod close to the hollow block is set as an inclined surface, and the side of the U-shaped rod close to the push plate is set as an inclined surface. The stability of the push plate can be enhanced by the connecting rod.

[0011] According to the above technical solution, the protection device includes a protection frame, a protection plate, a protection rod, a limit frame, a limit plate, a limit rod, a button and a limit groove. The button is limited by the limit rod so that the image measuring device cannot adjust the fill light device by pressing the button during operation. The protection frame is fixedly installed on the top of the push plate, the protection plate is slidably installed on the inner wall of the protection frame, the protection rod is fixedly installed on the bottom of the protection plate, the limit frame is fixedly installed on the inner wall of the placement rack, the limit plate is slidably installed on the inner wall of the limit frame, the limit rod is fixedly installed on the front side of the limit plate, the button is fixedly installed on the right side of the placement rack, the limit groove is opened on the circumferential surface of the button, and an elastic tube is arranged between the protection frame and the limit frame.

[0012] According to the above technical solution, a No. 4 spring is arranged between the protective frame and the protective plate, one end of the No. 4 spring is arranged on the top of the inner wall of the protective frame, and the other end is arranged on the top of the protective plate. The No. 4 spring can drive the protective plate to reset, and the bottom of the protective rod is set as an inclined surface, and the protective rod is in contact with the load-bearing rod.

[0013] According to the above technical solution, the button is electrically connected to the fill light device, liquid is arranged inside the protection frame, liquid is arranged inside the limit frame, and the liquid inside the protection frame is squeezed by the protection plate and enters the limit frame through the elastic tube.

[0014] The present invention provides an image measuring instrument with auxiliary positioning function. It has the following beneficial effects: (1) The image measuring instrument with auxiliary positioning function achieves the effect of auxiliary positioning by making the workpiece contact with the positioning groove and being limited by the positioning groove. Auxiliary positioning through the positioning groove can limit the position of the workpiece before measurement, ensuring the correct position of the workpiece in the field of view of the image measuring device, thereby improving the accuracy of the measurement result. The hollow block is limited by the slider so that the push plate cannot continue to move in the direction close to the positioning groove. The push plate cannot continue to move in the direction close to the positioning groove to prevent the workpiece from being over-extruded. Through reasonable clamping force, scratches and indentations on the workpiece surface can be reduced, and it can ensure that the workpiece maintains a stable position during the measurement process to avoid displacement or tilt caused by improper clamping.

[0015] (2) The image measuring instrument with auxiliary positioning function drives the L-shaped rod to move by moving the load-bearing rod toward the direction close to the hollow block. The L-shaped rod moves toward the direction close to the hollow block to contact the side of the workpiece and correct the position of the workpiece. The contact between the L-shaped rod and the side of the workpiece can effectively perform secondary correction on the workpiece, further ensuring that the workpiece is in the best measuring position of the image measuring equipment, thereby improving the overall measurement accuracy. The movement of the L-shaped rod drives the movement of the U-shaped rod, and the movement of the U-shaped rod knocks the push plate to generate vibration. The knocking action of the U-shaped rod can make the push plate fit the workpiece more closely through vibration, further improving the stability of clamping the workpiece.

[0016] (3) The image measuring instrument with auxiliary positioning function drives the limit rod to move by moving the limit plate in the direction close to the button. The limit rod moves to contact the inner wall of the limit groove and limit the button. The button is limited by the limit rod, so that the image measuring device cannot adjust the fill light device by pressing the button during operation. During the operation of the image measuring device, the measurement of the workpiece requires stable lighting conditions. The design of the limit rod can effectively prevent the fill light device from being adjusted due to accidental touch of external force during operation, thereby ensuring the clarity of the image and improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the position structure of the displacement device and the image measuring device of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement of part A; Figure 4 This is a schematic diagram of the placement frame and the electric push rod position structure of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure of part B in the middle is enlarged; Figure 6 This is a schematic diagram of the position structure of the push plate and the support rod of the present invention; Figure 7 This is a schematic diagram of the internal structure of the protection frame of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part C in the middle.

[0018] In the figure: 1. placement rack; 2. placement hole; 3. fill light device; 4. fixing rod; 5. displacement device; 6. image measurement device; 7. placement frame; 8. positioning slot; 9. electric push rod; 10. push plate; 11. support slot; 12. support rod; 13. support plate; 14. protection slot; 15. hollow block; 16. slider; 171. stabilizing hole; 172. L-shaped rod; 173. connecting rod; 174. U-shaped rod; 175. load-bearing rod; 176. load-bearing spring; 177. fixing ring; 181. protection frame; 182. protection plate; 183. protection rod; 184. limit frame; 185. limit plate; 186. limit rod; 187. button; 188. limit slot. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 8 An embodiment of the present invention is: an image measuring instrument with auxiliary positioning function, including a placement frame 1, and also including a positioning device, wherein a placement hole 2 is opened on the front side of the placement frame 1, and a fill light device 3 is arranged on the inner wall of the placement hole 2, a fixing rod 4 is fixedly installed on the inner wall of the placement frame 1, and a displacement device 5 is slidably installed on the circumferential surface of the fixing rod 4, and an image measuring device 6 is arranged on the front side of the displacement device 5, and a placement frame 7 is fixedly installed on the bottom of the inner wall of the placement frame 1, wherein the positioning device includes a positioning groove 8, an electric push rod 9, a push plate 10, a support groove 11, a support rod 12, a support plate 13, a protective groove 14, a hollow block 15 and a slider 16, and the positioning groove 8 is opened on the left side of the inner wall of the placement frame 7, The electric push rod 9 is fixedly installed through the inner and outer walls of the placement frame 7, the push plate 10 is fixedly installed at the output end of the electric push rod 9, the support groove 11 is opened on the left side of the push plate 10, the support rod 12 slides through the left and right walls of the support groove 11, the support plate 13 is fixedly installed on the side of the support rod 12 close to the positioning groove 8, the protection groove 14 is opened at the bottom of the inner wall of the placement frame 7, the hollow block 15 is slidably installed on the right side of the push plate 10, and the slider 16 is slidably installed on the inner wall of the hollow block 15. Auxiliary positioning through the positioning groove 8 can limit the position of the workpiece before measurement to ensure the correct position of the workpiece in the field of view of the image measuring device 6. Through reasonable clamping force, displacement or tilt caused by improper clamping can be avoided.

[0021] A spring No. 1 is arranged between the support groove 11 and the support rod 12 , and the support rod 12 can be driven to reset by the spring No. 1. The side of the hollow block 15 close to the support rod 12 is arranged as an inclined surface, and the hollow block 15 contacts the support rod 12 .

[0022] A No. 2 spring is arranged between the hollow block 15 and the slider 16, one end of the No. 2 spring is arranged on the top of the slider 16, and the other end is arranged on the inner wall of the hollow block 15. The slider 16 can be driven to reset by the No. 2 spring, and the bottom of the slider 16 is arranged as an inclined surface. A No. 3 spring is arranged between the hollow block 15 and the push plate 10, one end of the No. 3 spring is arranged on the right side of the push plate 10, and the other end is arranged on the surface of the hollow block 15. The hollow block 15 can be driven to reset by the No. 3 spring.

[0023] When this embodiment is working: the workpiece to be measured is placed on the top of the placement frame 7, and after the workpiece is placed stably, the electric push rod 9 drives the push plate 10 to move in the direction close to the positioning groove 8, and the push plate 10 moves in the direction close to the positioning groove 8 to push the workpiece to contact with the positioning groove 8. The workpiece contacts with the positioning groove 8 and is limited by the positioning groove 8 to achieve the effect of auxiliary positioning. At the same time, the push plate 10 moves in the direction close to the positioning groove 8 to drive the support rod 12 to move, and the movement of the support rod 12 drives the support plate 13 to move. The support plate 13 moves to contact with the workpiece and squeezes the workpiece. At the same time, the support plate 13 is subjected to the reaction force of the extruded workpiece and moves in the direction close to the electric push rod 9. The support plate 13 moves in the direction close to the electric push rod 9 and drives the support rod 12 to move. The support rod 12 moves to squeeze the No. 1 spring, and the No. 1 spring is squeezed by the support rod 12 The pressure produces deformation and accumulates force. At the same time, the support rod 12 moves toward the direction close to the electric push rod 9, contacts the hollow block 15 and squeezes the hollow block 15. The hollow block 15 moves downward due to the squeezing of the support rod 12. The hollow block 15 moves downward to squeeze the No. 3 spring. The No. 3 spring is squeezed by the hollow block 15 to produce deformation and accumulate force. At the same time, the hollow block 15 moves downward, driving the slider 16 to move downward. The slider 16 moves downward and contacts the protective groove 14 and limits the hollow block 15. The hollow block 15 is limited by the slider 16, so that the push plate 10 cannot continue to move in the direction close to the positioning groove 8. The push plate 10 cannot continue to move in the direction close to the positioning groove 8 to prevent the workpiece from being excessively squeezed. After the workpiece is stably clamped by the push plate 10, the displacement device 5 starts to drive the image measuring device 6 to move for image measurement.

[0024] See also Figure 1-Figure 8On the basis of the above embodiment, in another embodiment of the present invention, an auxiliary device for secondary correction of the workpiece is provided on the surface of the push plate 10, and a protective device is provided on the top of the push plate 10. The auxiliary device includes a stabilizing hole 171, an L-shaped rod 172, a connecting rod 173, a U-shaped rod 174, a load-bearing rod 175 and a fixing ring 177. The stabilizing hole 171 is opened on the surface of the push plate 10, and the load-bearing rod 175 slides through the surface of the push plate 10. The L-shaped rod 172 is fixedly installed on the circumferential surface of the load-bearing rod 175, the connecting rod 173 is fixedly installed on the right side of the push plate 10, the U-shaped rod 174 is fixedly installed on the side of the L-shaped rod 172 away from the connecting rod 173, and the fixing ring 177 is fixedly installed on the circumferential surface of the load-bearing rod 175. The contact between the L-shaped rod 172 and the side of the workpiece can effectively perform secondary correction on the workpiece, further ensuring that the workpiece is in the optimal measuring position of the image measuring device 6.

[0025] A load-bearing spring 176 is arranged between the load-bearing rod 175 and the push plate 10, and the load-bearing spring 176 can drive the load-bearing rod 175 to reset. The end of the L-shaped rod 172 close to the hollow block 15 is set as a slope, and the side of the U-shaped rod 174 close to the push plate 10 is set as a slope. The stability of the push plate 10 can be enhanced by the connecting rod 173. The knocking action of the U-shaped rod 174 can make the push plate 10 fit the workpiece more closely through vibration, thereby further improving the stability of clamping the workpiece.

[0026] The protection device includes a protection frame 181, a protection plate 182, a protection rod 183, a limit frame 184, a limit plate 185, a limit rod 186, a button 187 and a limit slot 188. The protection frame 181 is fixedly installed on the top of the push plate 10, the protection plate 182 is slidably installed on the inner wall of the protection frame 181, the protection rod 183 is fixedly installed on the bottom of the protection plate 182, the limit frame 184 is fixedly installed on the inner wall of the placement rack 1, the limit plate 185 is slidably installed on the inner wall of the limit frame 184, the limit rod 186 is fixedly installed on the front side of the limit plate 185, the button 187 is fixedly installed on the right side of the placement rack 1, and the limit slot 188 is opened on the circumferential surface of the button 187. An elastic tube is arranged between the protection frame 181 and the limit frame 184. The design of the limit rod 186 can effectively prevent the adjustment of the fill light device 3 caused by accidental touch of external force during operation, thereby ensuring the clarity of the image and improving the accuracy of the measurement.

[0027] A No. 4 spring is arranged between the protective frame 181 and the protective plate 182. One end of the No. 4 spring is arranged on the top of the inner wall of the protective frame 181, and the other end is arranged on the top of the protective plate 182. The No. 4 spring can drive the protective plate 182 to reset. The bottom of the protective rod 183 is arranged as an inclined surface, and the protective rod 183 is in contact with the load-bearing rod 175.

[0028] The button 187 is electrically connected to the fill light device 3 . Liquid is disposed inside the protection frame 181 , and liquid is disposed inside the limit frame 184 . The liquid inside the protection frame 181 is squeezed by the protection plate 182 and enters the limit frame 184 through the elastic tube.

[0029] When the present embodiment is working, the hollow block 15 is squeezed by the support rod 12 and moves downward, the hollow block 15 moves downward and breaks away from the contact with the L-shaped rod 172, the L-shaped rod 172 breaks away from the contact with the hollow block 15, so that the load-bearing rod 175 moves toward the direction close to the hollow block 15 under the elastic force of the load-bearing spring 176, the load-bearing rod 175 moves toward the direction close to the hollow block 15, drives the L-shaped rod 172 to move, the L-shaped rod 172 moves toward the direction close to the hollow block 15, contacts the side of the workpiece and corrects the position of the workpiece, and when the hollow block 15 moves upward and resets under the elastic force of the No. 3 spring, the hollow block 15 moves upward The L-shaped rod 172 contacts the inclined surface and squeezes the L-shaped rod 172. The L-shaped rod 172 is squeezed by the hollow block 15 and moves in the direction away from the electric push rod 9. The L-shaped rod 172 moves in the direction away from the electric push rod 9, driving the load-bearing rod 175 to move. The load-bearing rod 175 moves in the direction away from the electric push rod 9 to pull the load-bearing spring 176. The load-bearing spring 176 is deformed and accumulates force due to the pulling of the load-bearing rod 175. At the same time, when the L-shaped rod 172 moves in the direction close to the hollow block 15, the L-shaped rod 172 moves and drives the U-shaped rod 174 to move. The U-shaped rod 174 moves and hits the push plate 10 to generate vibration.

[0030] The load-bearing rod 175 moves toward the direction close to the hollow block 15 under the elastic force of the load-bearing spring 176, and the load-bearing rod 175 moves toward the direction close to the hollow block 15 to contact and squeeze the protective rod 183. The protective rod 183 moves upward under the squeezing of the load-bearing rod 175, and the upward movement of the protective rod 183 drives the protective plate 182 to move upward. The upward movement of the protective plate 182 squeezes the liquid inside the protective frame 181, and the liquid inside the protective frame 181 is squeezed by the protective plate 182 and enters the limit frame through the elastic tube. 184, the liquid entering the limit frame 184 squeezes the limit plate 185, and the limit plate 185 is squeezed by the liquid entering the limit frame 184 and moves toward the direction close to the button 187. The limit plate 185 moves toward the direction close to the button 187 and drives the limit rod 186 to move. The limit rod 186 moves to contact the inner wall of the limit groove 188 and limits the button 187. The button 187 is limited by the limit rod 186, so that the image measuring device 6 cannot adjust the fill light device 3 by pressing the button 187 during operation.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An image measuring instrument with auxiliary positioning function, comprising a placement frame (1), characterized in that: Also includes a positioning device; The placement rack (1) has a placement hole (2) on its front side, a fill light device (3) is provided on the inner wall of the placement hole (2), a fixing rod (4) is fixedly mounted on the inner wall of the placement rack (1), a displacement device (5) is slidably mounted on the circumferential surface of the fixing rod (4), an image measuring device (6) is provided on the front side of the displacement device (5), and a placement frame (7) is fixedly mounted on the bottom of the inner wall of the placement rack (1); The positioning device comprises a positioning groove (8), an electric push rod (9), a push plate (10), a support groove (11), a support rod (12), a support plate (13), a protection groove (14), a hollow block (15) and a sliding block (16); the positioning groove (8) is arranged on the left side of the inner wall of the placement frame (7); the electric push rod (9) is fixedly passed through the inner and outer walls of the placement frame (7); the push plate (10) is fixedly installed at the output end of the electric push rod (9); the support groove (11) is arranged on the left side of the push plate (10); the support rod (12) slides through the left and right walls of the support groove (11); the support plate (13) is fixedly installed on the side of the support rod (12) close to the positioning groove (8); the protection groove (14) is arranged on the bottom of the inner wall of the placement frame (7); the hollow block (15) is slidably installed on the right side of the push plate (10); and the sliding block (16) is slidably installed on the inner wall of the hollow block (15); Wherein, an auxiliary device for performing secondary correction on the workpiece is arranged on the surface of the push plate (10), and a protective device is arranged on the top of the push plate (10).

2. The image measuring instrument with auxiliary positioning function according to claim 1, characterized in that: A No. 1 spring is arranged between the support groove (11) and the support rod (12); a side of the hollow block (15) close to the support rod (12) is arranged as an inclined surface; and the hollow block (15) is in contact with the support rod (12).

3. The image measuring instrument with auxiliary positioning function according to claim 2, characterized in that: A No. 2 spring is arranged between the hollow block (15) and the slider (16); the bottom of the slider (16) is arranged as an inclined surface; and a No. 3 spring is arranged between the hollow block (15) and the push plate (10).

4. The image measuring instrument with auxiliary positioning function according to claim 3, characterized in that: The auxiliary device comprises a stabilizing hole (171), an L-shaped rod (172), a connecting rod (173), a U-shaped rod (174), a load-bearing rod (175) and a fixing ring (177), wherein the stabilizing hole (171) is formed on the surface of the push plate (10), the load-bearing rod (175) slides through the surface of the push plate (10), the L-shaped rod (172) is fixedly mounted on the circumferential surface of the load-bearing rod (175), the connecting rod (173) is fixedly mounted on the right side of the push plate (10), the U-shaped rod (174) is fixedly mounted on a side of the L-shaped rod (172) away from the connecting rod (173), and the fixing ring (177) is fixedly mounted on the circumferential surface of the load-bearing rod (175).

5. The image measuring instrument with auxiliary positioning function according to claim 4, characterized in that: A load-bearing spring (176) is provided between the load-bearing rod (175) and the push plate (10); one end of the L-shaped rod (172) close to the hollow block (15) is provided as an inclined surface; and one side of the U-shaped rod (174) close to the push plate (10) is provided as an inclined surface.

6. The image measuring instrument with auxiliary positioning function according to claim 5, characterized in that: The protection device comprises a protection frame (181), a protection plate (182), a protection rod (183), a limiting frame (184), a limiting plate (185), a limiting rod (186), a button (187) and a limiting groove (188); the protection frame (181) is fixedly mounted on the top of the push plate (10); the protection plate (182) is slidably mounted on the inner wall of the protection frame (181); the protection rod (183) is fixedly mounted on the bottom of the protection plate (182); the limiting frame (184) is fixedly mounted on the inner wall of the placement rack (1); the limiting plate (185) is slidably mounted on the inner wall of the limiting frame (184); the limiting rod (186) is fixedly mounted on the front side of the limiting plate (185); the button (187) is fixedly mounted on the right side of the placement rack (1); the limiting groove (188) is formed on the circumferential surface of the button (187); and an elastic tube is provided between the protection frame (181) and the limiting frame (184).

7. The image measuring instrument with auxiliary positioning function according to claim 6, characterized in that: A No. 4 spring is arranged between the protection frame (181) and the protection plate (182); the bottom of the protection rod (183) is arranged as an inclined surface; and the protection rod (183) is in contact with the load-bearing rod (175).

8. The image measuring instrument with auxiliary positioning function according to claim 7, characterized in that: The button (187) is electrically connected to the fill light device (3); liquid is provided inside the protection frame (181); and liquid is provided inside the limit frame (184).

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