A laser measuring instrument for inner diameter of metal workpiece

Abstract

The present invention relates to the technical field of inner diameter laser measurement, and specifically to a metal workpiece inner diameter laser measuring instrument, comprising a support frame, a main measuring column is installed through the left interior of the mounting plate, and the upper end of the main measuring column is connected to the output end of the motor above the mounting plate; an air storage airbag is installed in the internal slot of the support frame; a flow channel is opened inside the main measuring column, a circle of upper through holes is opened on the upper outer side surface of the main measuring column, and a circle of lower through holes is opened on the lower outer side surface of the main measuring column. The metal workpiece inner diameter laser measuring instrument is convenient for blowing away dust and impurities on the surface of the first laser ranging component, thereby greatly reducing the amount of dust in the surrounding environment of the first laser ranging component, thereby avoiding a large amount of dust from affecting the optical measurement accuracy of the laser measuring instrument, and thus facilitating the first laser ranging component to measure the inner diameter of the metal workpiece well.

Description

Technical Field

[0001] The invention relates to the technical field of inner diameter laser measurement, in particular to an inner diameter laser measuring instrument for a metal workpiece. Background Art

[0002] In the manufacturing process of some mechanical equipment, electromechanical equipment and precision molds, it is necessary to process and manufacture the metal workpieces inside first. After the metal workpieces are processed, they need to be inspected to determine whether the metal workpieces are qualified. Therefore, measuring the inner diameter of the metal workpiece with a laser measuring instrument is one of the important steps in metal workpiece inspection.

[0003] The patent name disclosed in the prior art with application number "CN201610843001.1" is "A multi-point laser inner diameter measuring instrument and its measurement and calculation method", which discloses the use of standard parts or calibration instruments, pressing the calibration key to calibrate four laser rangefinders, after calibration. Hold the handle and extend the spherical probe of the laser inner diameter measuring instrument into the object to be measured. The measuring section plane of the spherical probe should not be too large with the radial section of the object to be measured. Press the measurement key, the laser transmitter on the spherical probe emits laser, and the laser receiver records the distance values ​​of the four points. At the same time, move the handle to flip the spherical probe, and the memory records the distance value group. Press the calculation key, and the control chip calculates the geometric mean and standard deviation of the inner diameter values ​​corresponding to each distance value group. The minimum value obtained by comparison is the inner diameter value R' of this measurement. Change the measurement position by moving or rotating the handle. If the distance is not enough, rotate the rotary rod to extend it and measure it to obtain the inner diameter values ​​R'p (p = 1, 2...k) of multiple measurements. Take the geometric mean of R'p (p = 1, 2...k) to obtain the final inner diameter value R of the object to be measured. Press the display key, and the display screen will display the final R value.

[0004] The patent name disclosed in the prior art with application number "CN202110883597.9" is "A device and method for non-contact three-point measurement of the inner diameter of a circular hole", which discloses that sensor support frames are fixedly installed on the outside of the three laser displacement sensors, and two-axis tilting tables are fixedly installed on the bottom of the three sensor support frames, and two-axis translation tables are fixedly installed on the bottom of the three two-axis tilting tables. A workpiece bearing seat is placed at the bottom of the middle area of ​​the laser displacement sensor corner, and a circular hole workpiece to be measured is fixedly installed on the top of the workpiece bearing seat. A reflector bearing seat with a quadrangular pyramid reflector on the top is fixedly installed in the middle of the workpiece bearing seat. The circular hole workpiece to be measured refers to the standard circular hole workpiece in the standard state, and the workpiece bearing seat is at the bottom. The positions of the standard circular hole workpiece and the circular hole workpiece to be measured are both on the workpiece bearing seat, and the workpiece bearing seat can be used to place either the standard circular hole workpiece or the circular hole workpiece to be measured;

[0005] When the inner diameter laser measuring instrument is in use, if the surrounding environment is dusty, the inner diameter laser measuring instrument cannot clean the dust in the surrounding environment, which will cause the inner diameter laser measuring instrument to perform measurement work in a dusty environment. Since the laser measuring instrument is very sensitive to environmental conditions when in use, the dust will affect the optical measurement accuracy of the laser measuring instrument, thereby affecting the use of the laser measuring instrument.

[0006] Therefore, we propose a laser measuring instrument for the inner diameter of metal workpieces in order to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a laser measuring instrument for the inner diameter of a metal workpiece, so as to solve the problem raised in the above background technology that the inner diameter laser measuring instrument currently on the market cannot clean the dust in the surrounding environment when it is in use when there is a lot of dust in the surrounding environment, which will cause the inner diameter laser measuring instrument to perform measurement work in an environment with a lot of dust. Since the laser measuring instrument is very sensitive to environmental conditions when in use, the dust will affect the optical measurement accuracy of the laser measuring instrument, thereby affecting the use of the laser measuring instrument.

[0008] To achieve the above object, the present invention provides the following technical solution: A laser measuring instrument for inner diameter of a metal workpiece, comprising a support frame, and a threaded rod slotted and installed in the support frame;

[0009] The upper outer side of the threaded rod is connected with a mounting plate;

[0010] A main measuring column is installed through the left side of the mounting plate, and the upper end of the main measuring column is connected to the output end of the motor above the mounting plate;

[0011] The inner groove of the support frame is provided with an air storage airbag, and the inner groove of the support frame is provided with an extrusion control mechanism for extruding the air storage airbag;

[0012] The upper outer side of the main measuring column is rotatably connected with a flow guide frame, and the gas in the air storage bag is connected with the inside of the flow guide frame through the air supply pipeline assembly;

[0013] Two first laser distance measuring components are installed in the symmetrical grooves on the lower outer side of the main measuring column, and the outermost ends of the first laser distance measuring components are on the same vertical plane as the outer side surface of the main measuring column;

[0014] A flow channel is provided inside the main measuring column, a circle of upper through holes is provided on the upper outer side surface of the main measuring column, and a circle of lower through holes is provided on the lower outer side surface of the main measuring column.

[0015] Preferably, the bottom surface of the support frame is rotatably connected to a bottom plate, and the support frame and the bottom plate form a mirror-image "L"-shaped structure.

[0016] Preferably, the extrusion control mechanism comprises a control plate in a "7"-shaped structure installed on the right side of the mounting plate, a pressure plate is installed at the bottom end of the control plate, and an air storage bag is arranged below the pressure plate;

[0017] An air injection pipe is installed on the right side below the air storage airbag, the right end of the air injection pipe penetrates the right side of the support frame, and a one-way valve is installed inside the air injection pipe.

[0018] Preferably, the guide frame is a hollow structure inside and is arranged in a circular ring shape, and the right side of the guide frame is connected to the mounting plate through a fixing plate;

[0019] The air supply pipe assembly includes a first connecting pipe installed on the right side of the guide frame, a connecting hose is installed below the first connecting pipe, a second connecting pipe is installed below the connecting hose, the right end of the second connecting pipe passes through the interior of the support frame and is connected to the air storage airbag, and a one-way valve is installed in the first connecting pipe.

[0020] Preferably, the flow channel is arranged in an "I"-shaped structure, the upper and lower parts of the flow channel are arranged in a circular structure, and the spaces within the flow channel, the upper through hole and the lower through hole are connected;

[0021] The flow channel is connected to the space inside the flow guide frame through the upper through hole;

[0022] The lower through hole is arranged in an inclined structure, and a first laser distance measuring component is arranged below the lower through hole.

[0023] Preferably, four auxiliary measuring columns are installed at equal intervals outside the main measuring column, a first counterweight positioning column is rotatably installed below the two auxiliary measuring columns on the front and rear sides of the main measuring column, and a second counterweight positioning column is rotatably installed below the two auxiliary measuring columns on the left and right sides of the main measuring column, and both the first counterweight positioning column and the second counterweight positioning column are cylindrical structures;

[0024] The weight of the first counterweight positioning column and the second counterweight positioning column are both greater than the weight of the auxiliary measurement column, and the first counterweight positioning column and the second counterweight positioning column are vertically arranged.

[0025] Preferably, a connecting column is installed through the upper interior of the auxiliary measuring column, the upper and lower parts of the auxiliary measuring column are both arranged in a "U" shape, and the middle outer key of the connecting column is connected to a transmission gear.

[0026] Preferably, a support plate is installed on the upper outer side of the main measuring column, and limiting grooves are provided at equal intervals on the outer side of the support plate, and connecting columns are installed inside the limiting grooves;

[0027] The upper outer side of the main measuring column is threadedly connected to an adjusting disk, the lower surface of the adjusting disk is bearing-connected to a supporting disk, and rack assemblies are installed at equal intervals below the supporting disk. The lower end of the rack assembly is inserted into the limiting groove and meshed with the transmission gear.

[0028] Preferably, the transmission gear and the rack assembly are arranged in a one-to-one correspondence, the auxiliary measuring column rotates with the center of the connecting column as the center, and the four auxiliary measuring columns rotate synchronously;

[0029] The bearing plate, the adjusting plate and the supporting plate are all arranged in a circular ring-shaped structure. The adjusting plate is arranged above the supporting plate, and the guide frame is arranged above the adjusting plate.

[0030] Preferably, a semicircular mounting block is installed on the outer side of the second counterweight positioning column, a second laser distance measuring assembly is installed inside the mounting block, the outermost end of the second laser distance measuring assembly and the outer side surface of the second counterweight positioning column are on the same vertical plane, and a through groove is opened inside the second counterweight positioning column;

[0031] The height of the mounting block is less than the height of the second counterweight positioning column.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: when the metal workpiece inner diameter laser measuring instrument is in use, it is convenient to blow away the dust and impurities on the surface of the first laser ranging component, so that the amount of dust in the surrounding environment of the first laser ranging component is greatly reduced, thereby avoiding a large amount of dust affecting the optical measurement accuracy of the laser measuring instrument, so that the first laser ranging component is convenient to measure the inner diameter of the metal workpiece well. The specific contents are as follows:

[0033] (1) When the mounting plate drives the main measuring column to descend, the mounting plate will drive the regulating plate and the pressure plate to descend together, and then the pressure plate will squeeze the gas in the gas storage bag into the guide frame, so that the gas enters the flow groove, and the gas is later ejected through the lower through hole, which is convenient for blowing away the dust in the surrounding environment of the first laser ranging component. At the same time, because the lower through hole is arranged in an inclined shape, the wind blown out of the lower through hole will also blow to the surface of the first laser ranging component, which is convenient for blowing away the dust and impurities on the surface of the first laser ranging component, thereby greatly reducing the amount of dust in the surrounding environment of the first laser ranging component, thereby avoiding a large amount of dust affecting the optical measurement accuracy of the laser measuring instrument, so that the first laser ranging component is convenient for measuring the inner diameter of the metal workpiece;

[0034] One-way valves are installed in the first connecting pipe and the gas injection pipe, so as to prevent the gas in the gas storage bag from being discharged from the gas injection pipe when the gas storage bag is squeezed, so as to facilitate the injection of gas into the gas storage bag through the gas injection pipe later;

[0035] (2) Since the first counterweight positioning column and the second counterweight positioning column are heavier, the first counterweight positioning column and the second counterweight positioning column are always in a vertical state while moving outward, so that when the two first counterweight positioning columns and the two second counterweight positioning columns move outward to fit the inner wall of the metal workpiece, the main measuring column in the laser measuring instrument can be positioned and placed so that the center of the main measuring column and the center of the metal workpiece are on the same vertical line. The positioning and adjustment are convenient, and no external auxiliary tools are required. Then, the distance values ​​to the inner wall of the metal workpiece measured by the two first laser distance measuring components are added, and then the diameter value of the lower end of the main measuring column is added to obtain the inner diameter value of the metal workpiece. The calculation is simple and convenient, and no complicated calculation formula is required.

[0036] At the same time, by manually rotating the adjusting disk, the adjusting disk drives the four rack assemblies to move downward and mesh with the transmission gear, so that the transmission gear drives the connecting column and the transmission gear to rotate, thereby causing the connecting column to drive the four auxiliary measuring columns to rotate outward synchronously, and then the lower ends of the four auxiliary measuring columns drive the first counterweight positioning column and the second counterweight positioning column to move outward;

[0037] By setting the through slot, the second laser distance measuring component in the mounting block can measure the distance value from the inner wall of the metal workpiece to the outer side surface of the main measuring column, thereby adding the distance values ​​from the inner wall of the metal workpiece to the outer side surface of the main measuring column measured by the two second laser distance measuring components and adding the diameter value of the lower end of the main measuring column to obtain the inner diameter value of the metal workpiece. The inner diameter value of the metal workpiece measured by the first laser distance measuring component can be compared with the inner diameter value of the metal workpiece measured by the second laser distance measuring component to determine the accuracy of the laser measuring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0039] Figure 2 It is a schematic diagram of the cross-sectional structure of the support frame of the present invention;

[0040] Figure 3 This is a schematic diagram of the three-dimensional structure of the main measuring column of the present invention;

[0041] Figure 4 This is a schematic diagram of the cross-sectional structure of the main measuring column of the present invention;

[0042] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0043] Figure 6 This is a schematic diagram of the separation structure of the main measuring column and the auxiliary measuring column of the present invention;

[0044] Figure 7This is a schematic diagram of the separation structure of the support plate and the adjustment plate of the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the adjustment disk of the present invention when viewed from above;

[0046] Fig. 9 This is a schematic diagram of the supporting plate of the present invention when viewed from above;

[0047] Fig.10 This is a schematic diagram of the structure of the auxiliary measuring column after rotation of the present invention;

[0048] Fig.11 This is a schematic diagram of the cross-sectional structure of the connection between the auxiliary measuring column of the present invention and an external metal workpiece;

[0049] Fig.12 For the present invention Fig.11 Enlarged structural diagram at B in the middle.

[0050] In the figure: 1. support frame; 2. bottom plate; 3. threaded rod; 4. mounting plate; 5. main measuring column; 51. flow channel; 52. upper through hole; 53. lower through hole; 6. first laser ranging assembly; 7. supporting plate; 71. limit groove; 8. auxiliary measuring column; 81. transmission gear; 82. connecting column; 9. guide frame; 10. first connecting pipe; 11. connecting hose; 12. second connecting pipe; 13. regulating plate; 131. pressure plate; 14. air storage bag; 141. air injection pipe; 15. regulating plate; 151. rack assembly; 152. bearing plate; 16. first counterweight positioning column; 17. second counterweight positioning column; 171. through groove; 18. mounting block; 19. second laser ranging assembly. DETAILED DESCRIPTION

[0051] 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.

[0052] See also Figure 1-Figure 12 , the present invention provides the following technical solutions:

[0053] Embodiment 1: If the laser measuring instrument for inner diameter of metal workpiece in this embodiment cannot handle the dust when used in a dusty environment, the dust will affect the accuracy of the laser measuring instrument for measuring the inner diameter of the metal workpiece. In order to solve this problem, this embodiment discloses the following structure, which is shown in detail below. Figure 1-Figure 5 And attached Figure 8As shown, it includes a support frame 1 and a threaded rod 3 installed in a slot in the support frame 1; a mounting plate 4 is connected to the upper outer side of the threaded rod 3, a main measuring column 5 is installed through the left inner part of the mounting plate 4, the upper end of the main measuring column 5 is connected to the output end of the motor above the mounting plate 4, an air storage bag 14 is installed in the inner slot of the support frame 1, and an extrusion control mechanism for extruding the air storage bag 14 is installed in the inner slot of the support frame 1; a guide frame 9 is rotatably connected to the upper outer side of the main measuring column 5, and the gas in the air storage bag 14 is connected to the inside of the guide frame 9 through the air supply pipe assembly; two symmetrical grooves are installed on the lower outer side of the main measuring column 5 A first laser ranging component 6, the outermost end of the first laser ranging component 6 is on the same vertical plane as the outer side surface of the main measuring column 5; a flow channel 51 is provided inside the main measuring column 5, a circle of upper through holes 52 is provided on the upper outer side surface of the main measuring column 5, and a circle of lower through holes 53 is provided on the lower outer side surface of the main measuring column 5; the bottom surface of the support frame 1 is rotatably connected to the bottom plate 2, and the support frame 1 and the bottom plate 2 form a mirror-image "L"-shaped structure; the extrusion control mechanism includes a regulating plate 13 in a "7"-shaped structure installed on the right side of the mounting plate 4, a pressing plate 131 is installed at the bottom end of the regulating plate 13, and an air storage airbag 14 is arranged below the pressing plate 131.

[0054] An air injection pipe 141 is installed on the right side below the air storage bag 14, and the right end of the air injection pipe 141 passes through the right side of the support frame 1. A one-way valve is installed inside the air injection pipe 141. The guide frame 9 is a hollow structure inside and is arranged in a circular ring shape. The right side of the guide frame 9 is connected to the mounting plate 4 through a fixing plate; the air supply pipeline assembly includes a first connecting pipe 10 installed on the right side of the guide frame 9, a connecting hose 11 is installed below the first connecting pipe 10, and a second connecting pipe 12 is installed below the connecting hose 11. The right end of the second connecting tube 12 passes through the interior of the supporting frame 1 and is connected to the air storage bag 14. A one-way valve is installed in the first connecting tube 10. The flow channel 51 is arranged in an "I"-shaped structure. The top and bottom of the flow channel 51 are arranged in a circular structure. The spaces inside the flow channel 51, the upper through hole 52 and the lower through hole 53 are connected; the flow channel 51 is connected to the space inside the guide frame 9 through the upper through hole 52, and the lower through hole 53 is arranged in an inclined structure. A first laser ranging component 6 is arranged below the lower through hole 53.

[0055] Move the entire metal workpiece inner diameter laser measuring instrument into the working area. When it is necessary to measure the inner diameter of a metal workpiece with a smaller height, the metal workpiece with a smaller height can be directly placed on the base plate 2 and clamped and fixed by an external clamp so that the center of the metal workpiece with a smaller height is on the same vertical line as the center of the main measuring column 5. When it is necessary to measure the inner diameter of a metal workpiece with a higher height, the staff manually rotates the base plate 2 horizontally by 90° or 180°, and then places the main measuring column 5 directly above the metal workpiece with a higher height, so that the center of the metal workpiece with a higher height is on the same vertical line as the center of the main measuring column 5. Then the staff fixes the support frame 1 in a suitable position through an external mounting bracket.

[0056] Then the inner diameter of the metal workpiece can be measured. At this time, the motor above the support frame 1 is started, and the motor drives the threaded rod 3 to rotate. At this time, the threaded rod 3 drives the mounting plate 4 connected to the outer thread to move downward. At this time, the mounting plate 4 drives the main measuring column 5 to move downward, so that the lower end of the main measuring column 5 is inserted into the metal workpiece. At the same time, when the mounting plate 4 moves downward, it drives the regulating plate 13 and the pressing plate 131 to move downward together, and then the pressing plate 131 squeezes the air storage bag 14 in the support frame 1, so that the gas in the air storage bag 14 enters the second connecting pipe 12, the connecting hose 11 and the first connecting pipe 10 in turn. Since a one-way valve is installed in the air injection pipe 141, the gas in the squeezed air storage bag 14 It will not enter the gas injection pipe 141. Gas can be injected into the air storage bag 14 later through the gas injection pipe 141. A one-way valve is also installed in the first connecting pipe 10. Then the first connecting pipe 10 transports the gas to the guide frame 9 with a hollow structure and a circular ring structure. Then the gas in the guide frame 9 enters the flow channel 51 through the upper through hole 52. Then the gas below the flow channel 51 is discharged outward through the inclined lower through hole 53. As a result, the gas discharged from the lower through hole 53 blows the dust and impurities around the first laser ranging component 6 downward, thereby greatly reducing the dust around the first laser ranging component 6. Then the first laser ranging component 6 can perform the measurement work well, thereby improving the measurement accuracy.

[0057] The laser transmitter in the first laser ranging component 6 emits a thin laser beam to the inner wall of the metal workpiece, and then the laser receiver receives the laser beam reflected from the inner wall of the slave workpiece, and then analyzes the received laser signal through the signal processor to obtain the distance value. Since this part is the prior art, it is not introduced in detail here. At this time, one of the first laser ranging components 6 measures the distance value between the inner walls of the metal workpiece as F1, and the other first laser ranging component 6 measures the distance value between the inner walls of the metal workpiece as F2, and then the diameter of the lower end of the main measuring column 5 is F3. At this time, the inner diameter value of the metal workpiece is the sum of F1, F2 and F3. Therefore, the method of measuring and calculating the inner diameter of the metal workpiece is relatively simple, and there is no need to use a more complicated calculation formula.

[0058] During measurement, the main measuring column 5 can also be driven to rotate by the motor on the mounting plate 4, so that the first laser ranging component 6 can measure the inner wall of other positions of the metal workpiece. Through subsequent data comparison, it can be determined whether the inner wall of the metal workpiece is a standard circular shape or an elliptical shape.

[0059] Embodiment 2: The metal workpiece inner diameter laser measuring instrument in this embodiment, based on the embodiment 1, can conveniently position and place the first laser distance measuring component 6 during measurement, so that the center of the first laser distance measuring component 6 coincides well with the center of the metal workpiece, further improving the accuracy of the metal workpiece inner diameter measurement value. For details, refer to the attached Figure 1-Figure 4 And attached Figure 6-Figure 7 and attached Figure 9-10As shown, four auxiliary measuring columns 8 are installed at equal intervals on the outside of the main measuring column 5, a first counterweight positioning column 16 is rotatably installed below the two auxiliary measuring columns 8 on the front and rear sides of the main measuring column 5, and a second counterweight positioning column 17 is rotatably installed below the two auxiliary measuring columns 8 on the left and right sides of the main measuring column 5, and the first counterweight positioning column 16 and the second counterweight positioning column 17 are both cylindrical structures; the weight of the first counterweight positioning column 16 and the second counterweight positioning column 17 are both greater than the weight of the auxiliary measuring column 8, the first counterweight positioning column 16 and the second counterweight positioning column 17 are vertically arranged, and a connecting column 82 is installed through the upper interior of the auxiliary measuring column 8, and the upper and lower parts of the auxiliary measuring column 8 are both "U" shaped structures, the middle outer key of the connecting column 82 is connected to the transmission gear 81, and the upper outer A support plate 7 is installed on the side, and limiting grooves 71 are arranged at equal intervals on the outer side of the support plate 7, and connecting columns 82 are installed inside the limiting grooves 71. An adjusting plate 15 is threadedly connected to the outer side of the upper part of the main measuring column 5, and a bearing plate 152 is connected to the lower surface bearing of the adjusting plate 15. Rack components 151 are installed at equal intervals below the bearing plate 152, and the lower end of the rack component 151 is inserted into the limiting groove 71 and meshed with the transmission gear 81. The transmission gear 81 and the rack component 151 are arranged in a one-to-one correspondence. The auxiliary measuring column 8 rotates with the center of the connecting column 82 as the center, and the four auxiliary measuring columns 8 rotate synchronously. The bearing plate 152, the adjusting plate 15 and the support plate 7 are all arranged in a circular ring shape. An adjusting plate 15 is arranged above the support plate 7, and a guide frame 9 is arranged above the adjusting plate 15.

[0060] First, after the lower end of the main measuring column 5 is inserted into the metal workpiece, the staff manually rotates the adjusting disk 15. Since the outer side surfaces of the adjusting disk 15 and the main measuring column 5 are threaded structures, the adjusting disk 15 rotates and moves downward at the same time. At this time, the adjusting disk 15 drives the supporting disk 152 connected to the lower bearing to move downward together. At this time, the supporting disk 152 drives the rack assembly 151 to move downward. At this time, the limiting groove 71 limits the rack assembly 151, so that the rack assembly 151 moves downward stably. When the rack assembly 151 moves downward, it drives the meshing transmission gear 81 to rotate, and the transmission gear 81 drives the connecting column 82 and the auxiliary measuring column 8 to rotate together. At this time, the auxiliary measuring column 8 drives the first counterweight positioning column 16 and the second counterweight positioning column 17 below to move outward together. Since the first counterweight positioning column 16 and the second counterweight positioning column 17 The column 17 is heavy, so the first counterweight positioning column 16 and the second counterweight positioning column 17 are always in a vertical state. When the outer side surfaces of the first counterweight positioning column 16 and the second counterweight positioning column 17 are in contact with the inner wall of the metal workpiece, the rotation of the adjusting disk 15 is stopped. At this time, since the adjusting disk 15 is threadedly connected to the main measuring column 5, it can be self-locked, thereby ensuring the stability of the auxiliary measuring column 8 after rotation. Therefore, at this time, the outer side surfaces of the two first counterweight positioning columns 16 and the two second counterweight positioning columns 17 are in contact with the inner wall of the metal workpiece. Through adjustment, the center of the main measuring column 5 and the center of the metal workpiece can be made to be on the same vertical line. The adjustment is convenient and no external auxiliary adjustment tools are required. Then, as shown in Example 1, the laser measuring instrument can measure the inner diameter of the workpiece, thereby further improving the measurement accuracy.

[0061] Embodiment 3: The metal workpiece inner diameter laser measuring instrument in this embodiment is based on the embodiment 2. A mounting block 18 with a semicircular structure is installed on the outer side of the second counterweight positioning column 17. A second laser ranging component 19 is installed inside the mounting block 18. The outermost end of the second laser ranging component 19 is on the same vertical plane as the outer side surface of the second counterweight positioning column 17. A through groove 171 is provided inside the second counterweight positioning column 17. The height of the mounting block 18 is less than the height of the second counterweight positioning column 17. Two second laser ranging components 19 can be added to measure the inner diameter of the metal workpiece. Therefore, the laser measuring instrument can measure twice at the same time. By comparing the two values, the accuracy of the laser measuring instrument's measurement can be determined, thereby further improving the accuracy of the metal workpiece inner diameter measurement value. For details, please refer to the attached Figure 10-12As shown, when the outer side surfaces of the two first counterweight positioning columns 16 and the two second counterweight positioning columns 17 are in contact with the inner wall of the metal workpiece, one of the first laser ranging components 6 measures the distance between the inner walls of the metal workpiece as F1, and the other first laser ranging component 6 measures the distance between the inner walls of the metal workpiece as F2. Then the diameter of the lower end of the main measuring column 5 is F3. At this time, the inner diameter of the metal workpiece is the sum of F1, F2 and F3.

[0062] At the same time, the laser beams of the second laser ranging components 19 in the two mounting blocks 18 pass through the through slot 171 and irradiate the outer wall of the main measuring column 5 for measurement. At this time, one of the second laser ranging components 19 measures the distance between the inner wall of the metal workpiece and the outer wall of the main measuring column 5 as Y1, and the other second laser ranging component 19 measures the distance between the inner wall of the metal workpiece and the outer wall of the main measuring column 5 as Y2. Then the diameter of the lower end of the main measuring column 5 is F3. At this time, the inner diameter value of the metal workpiece is the sum of Y1, Y2 and F3. Then the inner diameter value of the metal workpiece measured by the first laser ranging component 6 can be compared with the inner diameter value of the metal workpiece measured by the second laser ranging component 19 to determine the accuracy of the laser measuring instrument, thereby completing a series of tasks.

[0063] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser measuring instrument for inner diameter of a metal workpiece, comprising a support frame (1), and a threaded rod (3) installed in a slot in the support frame (1); The upper outer side of the threaded rod (3) is connected to a mounting plate (4); Features: A main measuring column (5) is installed through the left interior of the mounting plate (4), and the upper end of the main measuring column (5) is connected to the output end of the motor above the mounting plate (4); An air storage bag (14) is installed in the internal slot of the support frame (1), and an extrusion control mechanism for extruding the air storage bag (14) is installed in the internal slot of the support frame (1); The upper outer side of the main measuring column (5) is rotatably connected to a flow guide frame (9), and the gas in the air storage bag (14) is connected to the inside of the flow guide frame (9) through the air supply pipeline assembly; Two first laser distance measuring components (6) are installed in symmetrical grooves on the lower outer side of the main measuring column (5), and the outermost ends of the first laser distance measuring components (6) are on the same vertical plane as the outer side surface of the main measuring column (5); The main measuring column (5) has a flow channel (51) formed inside, the upper outer side surface of the main measuring column (5) has a circle of upper through holes (52), and the lower outer side surface of the main measuring column (5) has a circle of lower through holes (53); The extrusion control mechanism comprises a control plate (13) in a "7"-shaped structure mounted on the right side of the mounting plate (4); a pressing plate (131) is mounted on the bottom end of the control plate (13); and an air storage bag (14) is arranged below the pressing plate (131); An air injection pipe (141) is installed on the right side below the air storage bag (14), the right end of the air injection pipe (141) penetrates the right side surface of the support frame (1), and a one-way valve is installed inside the air injection pipe (141); The guide frame (9) is a hollow structure inside and is arranged in a circular ring shape, and the right side surface of the guide frame (9) is connected to the mounting plate (4) via a fixing plate; The air supply pipe assembly comprises a first connecting pipe (10) installed on the right side of the guide frame (9), a connecting hose (11) is installed below the first connecting pipe (10), a second connecting pipe (12) is installed below the connecting hose (11), the right end of the second connecting pipe (12) passes through the interior of the support frame (1) and is connected to the air storage bag (14), and a one-way valve is installed in the first connecting pipe (10); The flow channel (51) is arranged in an "I"-shaped structure, the upper and lower parts of the flow channel (51) are arranged in a circular structure, and the spaces within the flow channel (51), the upper through hole (52) and the lower through hole (53) are interconnected; The flow channel (51) is connected to the space inside the flow guide frame (9) through the upper through hole (52); The lower through hole (53) is arranged in an inclined structure, and a first laser distance measuring component (6) is arranged below the lower through hole (53).

2. A metal workpiece inner diameter laser measuring instrument according to claim 1, characterized in that: The bottom surface of the support frame (1) is rotatably connected to a bottom plate (2), and the support frame (1) and the bottom plate (2) form a mirror-image "L"-shaped structure.

3. The laser measuring instrument for inner diameter of metal workpiece according to claim 1, characterized in that: Four auxiliary measuring columns (8) are installed at equal intervals outside the main measuring column (5); a first counterweight positioning column (16) is rotatably installed below the two auxiliary measuring columns (8) on the front and rear sides of the main measuring column (5); a second counterweight positioning column (17) is rotatably installed below the two auxiliary measuring columns (8) on the left and right sides of the main measuring column (5); the first counterweight positioning column (16) and the second counterweight positioning column (17) are both cylindrical structures; The weight of the first counterweight positioning column (16) and the second counterweight positioning column (17) are both greater than the weight of the auxiliary measurement column (8), and the first counterweight positioning column (16) and the second counterweight positioning column (17) are arranged vertically.

4. The laser measuring instrument for inner diameter of metal workpiece according to claim 3, characterized in that: A connecting column (82) is installed through the upper interior of the auxiliary measuring column (8), the upper and lower parts of the auxiliary measuring column (8) are both arranged in a "U"-shaped structure, and the middle outer side of the connecting column (82) is key-connected to a transmission gear (81).

5. The laser measuring instrument for inner diameter of metal workpiece according to claim 4, characterized in that: A support plate (7) is installed on the upper outer side of the main measuring column (5), and limiting grooves (71) are arranged at equal intervals on the outer side of the support plate (7), and connecting columns (82) are installed inside the limiting grooves (71); An adjusting disk (15) is threadedly connected to the upper outer side of the main measuring column (5); a bearing is connected to a supporting disk (152) on the lower surface of the adjusting disk (15); rack assemblies (151) are installed at equal intervals below the supporting disk (152); the lower end of the rack assembly (151) is inserted into the limiting groove (71) and meshedly connected to the transmission gear (81).

6. The laser measuring instrument for inner diameter of metal workpiece according to claim 5, characterized in that: The transmission gear (81) and the rack assembly (151) are arranged in a one-to-one correspondence, the auxiliary measuring column (8) rotates with the center of the connecting column (82) as the center, and the four auxiliary measuring columns (8) rotate synchronously; The bearing plate (152), the adjusting plate (15) and the supporting plate (7) are all arranged in a circular ring-shaped structure. The adjusting plate (15) is arranged above the supporting plate (7), and the guide frame (9) is arranged above the adjusting plate (15).

7. The laser measuring instrument for inner diameter of metal workpiece according to claim 3, characterized in that: A semicircular mounting block (18) is mounted on the outside of the second counterweight positioning column (17), a second laser distance measuring assembly (19) is mounted inside the mounting block (18), the outermost end of the second laser distance measuring assembly (19) and the outer side surface of the second counterweight positioning column (17) are on the same vertical plane, and a through groove (171) is provided inside the second counterweight positioning column (17); The height of the mounting block (18) is smaller than the height of the second counterweight positioning column (17).

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