Device and method for measuring inner and outer contours of pipe parts

Abstract

The invention relates to the technical field of mechanical measurement, in particular to a device and method for measuring the inner and outer contours of a pipe part, and aims to solve the problems that the operation is complicated, the efficiency is low, and measurement errors are easily caused by positioning deviation in the conventional measurement of the inner and outer contours of the pipe part. Comprising a moving frame, vertical rods, a frame, horizontal rotating rods, pulleys, inclined rotating rods and reference blocks, the vertical rods are fixedly connected to the four corners of the inner side of the moving frame, the frame is fixedly connected between the outer sides of the upper portions of the four vertical rods, the horizontal rotating rods are rotationally connected to the upper ends of the vertical rods, and the free ends of the horizontal rotating rods are rotationally connected with the pulleys. The four rotatable pulleys are in rolling contact with the outer wall of the pipe fitting and are matched with linkage of the tension spring, the oblique rotating rod and the reference block, so that the reference block moves downwards along the vertical rod along with the change of the outer diameter of the pipe fitting and directly corresponds to the outer diameter scale mark reading, the process is simple and convenient to operate, the pulleys can adapt to different diameters, the clamping force is stable, and the clamping efficiency is high. And the consistency and reliability of outer diameter measurement are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical measurement, in particular to a pipe part inner and outer contour measuring device and a measuring method thereof. BACKGROUND

[0002] Pipe parts (such as metal pipes, plastic pipes, etc.) as important industrial and structural components, the inner and outer diameter size precision directly affects the assembly performance and use reliability of the product. In the traditional measurement method, the outer diameter and the inner diameter usually need to be measured by using caliper, micrometer or inner diameter gauge respectively. Such method not only has complicated operation steps and low measurement efficiency, but also is difficult to ensure the positioning stability of the pipe during the measurement process, and is easy to introduce errors due to human factors or pipe offset, especially for batch detection occasions.

[0003] Although there are some special measuring fixtures in the prior art, most of them have complex structure or single function, and cannot realize the synchronous and rapid measurement and automatic positioning correction of the inner and outer diameters of the pipe. For example, the common outer diameter measuring structure lacks self-adaptive clamping and stable holding mechanism, and is easy to cause reading fluctuation due to slight rotation or displacement of the pipe during the measurement process. In terms of inner diameter measurement, most devices rely on manual centering or single-point measurement, and it is difficult to simultaneously obtain multi-directional inner diameter data and automatically correct the coaxiality deviation of the pipe and the measurement axis.

[0004] Therefore, there is an urgent need for an integrated measuring device which is simple to operate, can simultaneously complete stable measurement of the inner and outer contours of the pipe, and has automatic positioning correction function, so as to improve the measurement efficiency, ensure the data consistency, and adapt to the demand for rapid detection of batch parts in modern production. SUMMARY

[0005] In order to overcome the shortcomings of complicated operation, low efficiency and easy to cause measurement error due to positioning deviation in the existing inner and outer diameter measurement of pipe parts, the present application provides a pipe part inner and outer contour measuring device and a measuring method thereof.

[0006] The technical implementation scheme of the present application is: a pipe part inner and outer contour measuring device, comprising a moving frame, a vertical rod, a frame, a horizontal rotating rod, a pulley, an inclined rotating rod, a reference block, a tension spring, an outer diameter scale mark and an inner diameter measuring assembly, four vertical rods are fixedly connected to the inner side of the moving frame, a frame is fixedly connected between the outer sides of the upper portions of the four vertical rods, a horizontal rotating rod is rotatably connected to the upper end of each vertical rod, a pulley is rotatably connected to the free end of each horizontal rotating rod, an inclined rotating rod is rotatably connected to one side of each horizontal rotating rod close to the pulley, a reference block is slidably connected to the upper side of each vertical rod, the free end of each inclined rotating rod is rotatably connected to the reference block on the corresponding side, a tension spring is connected between the bottom four corners of the frame and the reference block on the corresponding side, an outer diameter scale mark is engraved on the outer side wall of the upper portion of each vertical rod, and an inner diameter measuring assembly is assembled on each vertical rod.

[0007] Further, universal wheels with brake function are arranged at the four corners of the bottom of the mobile frame.

[0008] Further, a friction ring made of rubber is sleeved on the outer ring of the pulley.

[0009] Further, the inner diameter measuring assembly comprises lifting blocks, a lifting plate, measuring pieces, inner diameter scale marks, and an auxiliary assembly. The middle parts of the vertical rods are slidably connected with the lifting blocks. The lifting plate is fixedly connected between the four lifting blocks. Four sliding grooves are arranged on the top of the lifting plate in an X-shaped distribution. The measuring pieces are slidably connected to the sliding grooves. Inner diameter scale marks are engraved on the top surface of the lifting plate corresponding to the positions on both sides of each sliding groove. The bottom of the lifting plate is provided with the auxiliary assembly.

[0010] Further, the auxiliary assembly comprises sliding rails, sliding blocks, hinged rods, guide columns, and compression springs. The sliding rails are fixedly arranged on the bottom of the lifting plate corresponding to the positions of the four sliding grooves. The sliding blocks are slidably connected to the sliding rails. The lower ends of the measuring pieces penetrate through the lifting plate and are fixedly connected with the corresponding sliding blocks. The bottom of each sliding block is rotatably connected with the hinged rod. The middle position of the inner bottom of the mobile frame is fixedly connected with the guide column. A through hole is arranged in the middle part of the lifting plate. The lifting plate is slidably connected with the guide column through the through hole. The lower end of the hinged rod is rotatably connected with the center of the lower part of the guide column. The lower part of each vertical rod is sleeved with a compression spring. The ends of the compression spring are fixedly connected with the bottom of the lifting block and the lower end of the vertical rod, respectively.

[0011] Further, graphite lubricating strips are embedded in the inner walls of the sliding grooves of the lifting plate. Oil storage grooves are arranged on the contact surfaces of the sliding blocks and the sliding rails.

[0012] Further, the measuring piece further comprises a semicircular positioning strip. The end surface of the measuring piece in contact with the inner wall of the pipe is provided with a semicircular positioning strip. Reference grooves are arranged on the two side walls of the measuring piece corresponding to the inner diameter scale marks.

[0013] Further, the pulley further comprises clamping beads and return springs. Multiple clamping grooves are arranged on the side walls of the pulley at intervals in the circumferential direction. Adapted mounting grooves are arranged on the horizontal rotating rod corresponding to the clamping grooves on the side walls of the pulley. Clamping beads are slidably connected in the mounting grooves. Return springs are connected between the clamping beads and the inner walls of the corresponding mounting grooves. The clamping beads and the clamping grooves form a clamping and cooperating relationship.

[0014] Further, the inner diameter measuring assembly further comprises displacement sensors, rollers, and a control screen. The displacement sensors are installed through the lifting blocks. The detection shaft ends of the displacement sensors are connected with the rollers. The lifting blocks are provided with notches corresponding to the positions of the vertical rods. The rollers are embedded in the notches and form rolling contact with the outer walls of the vertical rods. The control screen is installed on the right side of the front side wall of the mobile frame. The displacement sensors are electrically connected with the control screen.

[0015] A measuring method of a pipe part inner and outer contour measuring device, comprising the following steps: S1: Confirm that the device is in the initial state, that is, the horizontal rotating rod is horizontal, the bottom edge of the reference block is aligned with the minimum value of the outer diameter scale mark, and the measuring piece is in the inner reset state. Align the straight pipe to be measured with the four pulleys from top to bottom and slowly push the pipe downward. S2: After the bottom surface of the pipe fitting contacts the pulley, it continues to press down, driving the horizontal rotating rod to rotate downward and pushing the reference block down through the inclined rotating rod. The tension spring is stretched until the four pulleys are close to the outer wall of the pipe fitting. The pipe fitting is pressed down further, so that it contacts the top surface of the lifting plate and pushes the lifting block down. The compression spring is compressed, and the hinge rod drives the measuring piece to unfold outward synchronously. S3: When the semi-circular positioning strip is fully in contact with the inner wall of the pipe fitting, stop pressing down on the pipe fitting. At this time, the retaining ball is inserted into the pulley groove under the action of the return spring, the pulley is fixed, read the corresponding outer diameter scale mark value of the reference block, and record the outer diameter of the pipe fitting. S4: Read the inner diameter scale mark value corresponding to the reference groove of the measuring piece, and at the same time check the inner diameter electronic data transmitted by the displacement sensor on the control panel. After comparing and verifying the two sets of data, record the inner diameter radius of the pipe fitting. S5: After the measurement is completed, apply an upward pulling force to the pipe fitting. When the pulling force is greater than the sum of the tension spring and the return spring force, pull the pipe fitting upward. After the pipe fitting is separated, the tension spring and the compression spring drive each component to reset in sequence, and the device returns to its initial state, so that the next pipe fitting can be measured.

[0016] Compared with the prior art, the present invention has the following advantages: 1. By using four rotatable pulleys to roll into contact with the outer wall of the pipe fitting, and in conjunction with the tension spring, the inclined rotating rod and the reference block, the reference block moves down along the upright as the outer diameter of the pipe fitting changes, directly corresponding to the outer diameter scale reading. This process is simple to operate, and the pulleys can adapt to different diameters, the clamping force is stable, and the consistency and reliability of the outer diameter measurement are effectively improved.

[0017] 2. The pipe fitting is pressed down by the lifting plate, which drives the four measuring parts to expand radially along the slide groove until the semi-circular positioning strip abuts the inner wall. The linkage structure of the measuring parts ensures their synchronous movement, which not only directly corresponds to the inner diameter scale reading, but also automatically corrects the position of the pipe fitting on the lifting plate, reducing the measurement error of the inner and outer diameter caused by the pipe fitting offset.

[0018] 3. The inner diameter measuring component is equipped with an inner diameter scale mark for direct reading. At the same time, the displacement sensor detects the displacement of the lifting plate and converts it into an inner diameter value, which is displayed on the control panel. The dual data sources can be compared and verified with each other, and also avoid the inconvenience or visual error that may be caused by a single reading method, thus enhancing the reliability of the measurement and the user-friendliness of operation.

[0019] 4. The pulley is equipped with a retaining ball and a return spring. After the pipe is in place, the retaining ball (502) springs into the slot, increasing the resistance to pulley rotation. This structure, together with the clamping force of the tension spring, can prevent the pulley from rotating accidentally or the pipe from shifting during the measurement process, ensuring that the pipe is continuously and stably clamped when measuring the outer diameter, and further improving the repeatability of the overall measurement results. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the components of the present invention, including the horizontal rotating rod, pulley, and inclined rotating rod.

[0022] Figure 3 This is a three-dimensional structural diagram of the reference block, tension spring, and outer diameter scale markings of the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the lifting block, lifting plate, and sliding groove components of the present invention.

[0024] Figure 5 This is a cross-sectional view of the slide rail, slider, and hinge rod components of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the measuring component, reference groove, and semi-circular positioning strip of the present invention.

[0026] Figure 7 This is a three-dimensional structural diagram of the components of the present invention, such as the upright pole, horizontal rotating pole, and pulley.

[0027] Figure 8 This is a cross-sectional view of the components of the present invention, such as the slot, the ball, and the return spring.

[0028] Figure 9 This is a three-dimensional structural diagram of the pole, displacement sensor, and roller components of the present invention.

[0029] Figure 10 This is a cross-sectional view of the pole, displacement sensor, and roller components of the present invention.

[0030] Figure 11 This is a diagram showing the state of the tube body during the measurement of the outer diameter of the tube body according to the present invention.

[0031] Figure 12 This is a diagram showing the state of the tube body during the measurement process according to the present invention.

[0032] Explanation of reference numerals in the attached drawings: 1. Moving frame; 102. Upright pole; 103. Frame; 104. Horizontal rotating rod; 105. Pulley; 106. Diagonal rotating rod; 107. Reference block; 108. Tension spring; 109. Outer diameter scale mark; 201. Lifting block; 202. Lifting plate; 203. Slide groove; 204. Measuring component; 205. Inner diameter scale mark; 301. Slide rail; 302. Slider; 303. Hinge rod; 304. Guide post; 305. Compression spring; 401. Reference groove; 402. Semicircular positioning bar; 501. Slot; 502. Ball bearing; 503. Return spring; 601. Displacement sensor; 602. Roller; 603. Control panel. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Example 1: A device for measuring the inner and outer contours of tubular parts, such as Figures 1-6 and Figures 11-12 As shown, the device includes a movable frame 1, uprights 102, a frame 103, a horizontal rotating rod 104, pulleys 105, an inclined rotating rod 106, a reference block 107, a tension spring 108, an outer diameter scale marking 109, and an inner diameter measuring assembly. The movable frame 1 has a square structure, with uprights 102 vertically fixed to its four inner corners. The frame 103 is bolted to the upper outer sides of the four uprights 102, and the upper ends of the four uprights 102 are rotatably connected to horizontal rotating rods 104. 04. The horizontal rotating rod 104 is initially set horizontally. Each free end of the horizontal rotating rod 104 is rotatably connected to a pulley 105. An inclined rotating rod 106 is rotatably connected to the side of the horizontal rotating rod 104 closest to the pulley 105. A reference block 107 is slidably connected to the upper side of the vertical rod 102 in the vertical direction. The free ends of the inclined rotating rods 106 are rotatably connected to the corresponding reference blocks 107. The four corners of the bottom of the frame 103 are connected to the corresponding reference blocks 107. Each part is connected by a tension spring 108. The outer wall of the upper part of the upright 102 is engraved with an outer diameter scale mark 109 in the vertical direction. In the initial state, the bottom edge of the reference block 107 is aligned with the minimum value of the outer diameter scale mark 109. The upright 102 is equipped with an inner diameter measuring component for measuring the inner diameter of the pipe fitting. The four corners of the bottom of the moving frame 1 are equipped with universal wheels with brake function, which makes the entire measuring device easy to move and position, and facilitates flexible transfer between different work positions or sites. The brake function design can lock the universal wheels by stepping on the brake after the device reaches the measuring position, ensuring that the device is stable and does not shift during the measurement process. The outer ring of the pulley 105 is fitted with a friction ring made of rubber. This material has a certain elasticity and a high coefficient of friction, which can provide moderate flexibility and anti-slip effect when clamping the outer wall of the pipe fitting. It protects the surface of the pipe fitting from being scratched and enhances the clamping stability. It is especially suitable for measuring the surface polished or coated pipe fittings.

[0035] likeFigures 1-2 and Figures 4-6 As shown, the inner diameter measuring assembly includes lifting blocks 201, lifting plates 202, measuring elements 204, inner diameter scale markings 205, and auxiliary components. Lifting blocks 201 are slidably connected to the middle of the upright 102 along the vertical direction. Lifting plates 202 are bolted together between the four lifting blocks 201. Four X-shaped grooves 203 are distributed on the top of the lifting plates 202. Measuring elements 204 are slidably connected to each groove 203 along its length. The four measuring elements 204 move in the following directions... All correspond to the radial direction of the inner diameter of the pipe to be measured. The top surface of the lifting plate 202 is engraved with inner diameter scale marks 205 corresponding to the two sides of each slide 203. The measuring component 204 is integrally formed by the upper triangular component and the bottom horizontal plate. The horizontal plate is flush with the slide 203 and the inner diameter scale marks 205. The triangular component is arranged in a vertical state to fit the inner wall of the pipe to be measured. The bottom of the lifting plate 202 is equipped with auxiliary components for driving the measuring component 204 to unfold or reset synchronously.

[0036] like Figure 2 and Figures 4-6 As shown, the auxiliary components include a slide rail 301, a slider 302, a hinge rod 303, a guide post 304, and a compression spring 305. Slide rails 301 are fixedly mounted at the bottom of the lifting plate 202 corresponding to the four slide grooves 203. A slider 302 is slidably connected to each slide rail 301. The lower end of the measuring piece 204 passes through the lifting plate 202 and is fixedly connected to the corresponding slider 302. A hinge rod 303 is rotatably connected to the bottom of each slider 302. A guide post 304 is bolted to the center of the bottom of the moving frame 1. A through hole is opened in the middle of the lifting plate 202, through which the lifting plate 202 slides in cooperation with the guide post 304. The lower end of each hinge rod 303... All are rotatably connected to the lower center of the guide column 304. The lower part of the upright 102 is fitted with a compression spring 305. The upper end of the compression spring 305 is fixed to the bottom of the lifting block 201, and the lower end of the compression spring 305 is fixed to the lower end of the upright 102. The elastic force of the tension spring 108 is greater than that of the compression spring 305. The inner wall of the slide groove 203 of the lifting plate 202 is fitted with a graphite lubricating strip. An oil storage groove is opened on the contact surface between the slider 302 and the slide rail 301. The graphite lubricating strip can reduce the sliding friction resistance between the measuring component 204 and the slide groove 203. The oil storage groove can store lubricating oil, extend the service life of the components, and at the same time ensure the smoothness and synchronization of the sliding of the measuring component 204.

[0037] like Figure 6As shown, the measuring component 204 also includes a semi-circular positioning strip 402. A small-area semi-circular positioning strip 402 is fitted onto the end face of the triangular component of the measuring component 204 that contacts the inner wall of the pipe. This ensures that the measuring component 204 only forms a single-point / narrow-surface contact with the inner wall of the pipe, avoiding multi-point contact errors caused by an excessively large contact area. Simultaneously, the semi-circular arc surface of the semi-circular positioning strip 402 can adapt and fit against the arc surface of the inner wall of the pipe. The horizontal plate of the measuring component 204 corresponds to the side of the inner diameter scale mark 205. The wall is provided with a reference groove 401. By aligning the reference groove 401 with the inner diameter scale mark 205, the radius values ​​of the four radial directions of the pipe fitting to be measured can be directly read. The distance between the semi-circular positioning strip 402 of the measuring component 204 and the reference groove 401 is a fixed reference length. The value of the inner diameter scale mark 205 has been superimposed on this fixed reference length. Therefore, by directly reading the value of the inner diameter scale mark 205 aligned with the reference groove 401, the radius value of the inner diameter of the pipe fitting can be obtained.

[0038] When measuring straight pipes, the pipe to be measured is aligned with the four pulleys 105 from top to bottom and pushed downwards. After the bottom surface of the pipe contacts the pulleys 105, the pulleys 105 and the horizontal rotating rod 104 are squeezed and rotated downwards around the upper end of the upright rod 102. When the horizontal rotating rod 104 rotates downwards, it drives the inclined rotating rod 106 to rotate synchronously. The inclined rotating rod 106 pushes the reference block 107 to move vertically downwards along the upright rod 102. At this time, the tension spring 108 between the frame 103 and the reference block 107 is gradually stretched until all four pulleys 105 are in close contact with the outer wall of the pipe and can roll down with the pipe. The difference in the outer diameter of the pipe will cause the horizontal rotating rod 104 to rotate at different amplitudes. This rotation amplitude is related to... The downward movement of the reference block 107 is corresponding. The outer diameter of the pipe can be directly read through the outer diameter scale mark 109 on the upright 102. When the pipe continues to move downward until it contacts the top surface of the lifting plate 202, all four measuring elements 204 are located in the inner cavity of the pipe. The operator continues to push the pipe downward, squeezing the lifting plate 202 and the lifting block 201 to slide vertically downward along the upright 102. At this time, the compression spring 305 is gradually compressed. During the downward movement of the lifting plate 202, the measuring elements 204, slide rail 301 and slider 302 on it move downward synchronously. The guide post 304 provides guidance for the downward movement of the lifting plate 202 through the sliding cooperation with the through hole of the lifting plate 202. When the measuring element 204 and the slider 302 move downwards, the driving hinge rod 303 rotates around the lower center of the guide post 304. Through the transmission of the hinge rod 303, the measuring element 204 and the slider 302 are pushed to slide outwards along the slide rail 301, so that the four measuring elements 204 simultaneously unfold outwards along the corresponding slide grooves 203 until the semi-circular positioning strip 402 on the measuring element 204 abuts against the inner wall of the pipe. At this time, the measuring element 204 can no longer move outwards, the lifting plate 202 stops moving downwards, and the pipe also stops moving downwards. In this measurement state, the elastic force of the tension spring 108 continuously applies an inward restoring force to the horizontal rotating rod 104 through the inclined rotating rod 106, so that the four pulleys 105 always press against the outside of the pipe. The wall ensures the stability of the outer diameter measurement and prevents the lifting plate 202 and measuring parts 204 from easily resetting during the measurement process. The synchronous movement of the four measuring parts 204 can accurately adapt to the inner diameter of the pipe fitting to complete the measurement, and can automatically correct the placement position of the pipe fitting on the lifting plate 202, further improving the accuracy of the outer diameter measurement of the pipe fitting. After positioning is completed, the outer diameter of the pipe fitting is obtained by reading the value of the outer diameter scale mark 109 corresponding to the bottom edge of the reference block 107, and the inner diameter radius of the pipe fitting is obtained by reading the value of the inner diameter scale mark 205 corresponding to the reference groove 401 on the measuring part 204, and the measurement data is recorded.

[0039] When the pipe fitting is removed after measurement, an upward pulling force greater than that of the tension spring 108 is applied to the pipe fitting to pull it upward. During the upward movement of the pipe fitting, the pulley 105 rotates with the friction of the outer wall of the pipe fitting, reducing the resistance to removing the pipe fitting. When the pipe fitting moves upward and separates from the lifting plate 202, the elastic potential energy of the compression spring 305 is released and it rebounds to its original position, driving the lifting block 201 and the lifting plate 202 to move upward along the upright 102, which in turn drives the slide rail 301, the slider 302 and the measuring piece 204 to move upward synchronously. When the slider 302 moves upward, it drives the hinge rod 3. 03. Reverse rotation drives the measuring element 204 and slider 302 to slide inward along the slide rail 301 to reset via the hinge rod 303. When the pipe is completely disengaged from the pulley 105, the elastic potential energy of the tension spring 108 is released and rebounds to reset, driving the reference block 107 to move upward along the upright rod 102, which in turn drives the inclined rotating rod 106 and the horizontal rotating rod 104 to rotate in the opposite direction to reset. Finally, the horizontal rotating rod 104 and the pulley 105 return to the initial horizontal state, and the device is restored to the unused state, ready for the measurement of the inner and outer contours of the next pipe.

[0040] Example 2: Based on Example 1, such as Figures 7-8 As shown, the pulley 105 also includes a retaining ball 502 and a return spring 503. Multiple retaining slots 501 are spaced apart circumferentially on both sides of the pulley 105. The horizontal rotating rod 104 has a matching mounting slot at the position corresponding to the retaining slots 501 on both sides of the pulley 105. A retaining ball 502 is slidably connected in each mounting slot. A return spring 503 is connected between the retaining ball 502 and the inner wall of the corresponding mounting slot. In the initial state, the retaining ball 502 extends out of the mounting slot under the elastic force of the return spring 503 and is engaged in the corresponding retaining slot 501 to increase the friction and resistance when the pulley 105 rotates and improve the stability in the initial state.

[0041] When the pipe to be measured presses down on the four pulleys 105 from top to bottom and drives them to rotate outward, the outer wall of the pipe contacts the pulleys 105. Under the pushing force of the pipe, the pulleys 105 tend to rotate around the rotation axis of the horizontal rotating rod 104. When the rotational force is greater than the elastic force of the return spring 503, the slot 501 on the side wall of the pulley 105 will compress the retaining ball 502 into the mounting groove, and the return spring 503 will be compressed accordingly, allowing the pulley 105 to rotate smoothly. When the pipe moves down to contact the top surface of the lifting plate 202 and is pressed into place, the pulley 105 is tightly fitted with the outer wall of the pipe and stops rotating. At this time, the retaining ball 502 is ejected from the mounting groove under the elastic force of the return spring 503 and re-inserted into the corresponding slot 501. This increases the rotational resistance between pulley 105 and horizontal rotating rod 104. In this state, the elastic force of tension spring 108 is transmitted to pulley 105 through inclined rotating rod 106 and horizontal rotating rod 104, so that pulley 105 always clamps the outer wall of the pipe. At the same time, the cooperation between locking ball 502 and locking groove 501 can effectively prevent pulley 105 from rotating randomly, further enhancing the clamping effect of pulley 105 on the outer wall of the pipe, ensuring the positioning stability of the pipe during the entire measurement process, and improving the measurement accuracy. After the pipe is measured, an upward pulling force is applied to the pipe. When the pulling force is greater than the sum of the elastic force of return spring 503 and the pulling force of tension spring 108, pulley 105 can be driven to rotate again, thereby easily pulling the pipe upward.

[0042] like Figures 1-2 and Figures 9-10 As shown, the inner diameter measuring assembly also includes a displacement sensor 601, a roller 602, and a control panel 603. The displacement sensor 601 is bolted to the lifting block 201. The roller 602 is fixedly connected to the end of the detection shaft of the displacement sensor 601. A notch is opened on the lifting block 201 corresponding to the position of the upright 102. The roller 602 is embedded in the notch and forms a rolling contact with the outer wall of the upright 102. The control panel 603 is bolted to the right side of the front side wall of the moving frame 1. The displacement sensor 601 is electrically connected to the control panel 603 to realize the real-time transmission of detection data.

[0043] When the pipe fitting presses down on the lifting plate 202, the lifting plate 202 drives four lifting blocks 201 to slide synchronously downwards along the upright 102. During the movement of the lifting blocks 201, the displacement sensor 601 and roller 602 on them move synchronously downwards. Since the roller 602 is in rolling contact with the outer wall of the upright 102, under the drive of the lifting blocks 201, the roller 602 rolls along the outer wall of the upright 102 and drives the detection shaft of the displacement sensor 601 to rotate synchronously. The encoder inside the displacement sensor 601 converts the rotation of the detection shaft into an electrical signal, which is then processed internally and converted into linear displacement data of the lifting block 201. This displacement data is compared with the measured linear displacement data. The movement of component 204 along the slide groove 203 is in a one-to-one correspondence, and the inner diameter of the pipe can be calculated through a preset algorithm. The inner diameter data calculated by displacement sensor 601 is transmitted to control screen 603 in real time and clearly displayed on the display interface of control screen 603. This structure can effectively avoid the inconvenience and reading error problems that may occur when manually reading the inner diameter scale mark 205. At the same time, the staff can compare and verify the electronic data displayed on control screen 603 with the data of the inner diameter scale mark 205 read manually to obtain dual measurement data, further verify the accuracy of the measurement results and improve the reliability of measurement.

[0044] A method for measuring the inner and outer contours of tubular parts includes the following steps: S1: Confirm that the device is in the initial state, that is, the horizontal rotating rod 104 is horizontal, the bottom edge of the reference block 107 is aligned with the minimum value of the outer diameter scale mark 109, and the measuring piece 204 is in the inner reset state. Align the straight pipe to be measured with the four pulleys 105 from top to bottom and slowly push the pipe downward. S2: After the bottom surface of the pipe fitting contacts the pulley 105, it continues to press down, driving the horizontal rotating rod 104 to rotate downward and pushing the reference block 107 to move down through the inclined rotating rod 106. The tension spring 108 is stretched until the four pulleys 105 are close to the outer wall of the pipe fitting. The pipe fitting is pressed down further, so that it contacts the top surface of the lifting plate 202 and pushes the lifting block 201 to move down. The compression spring 305 is compressed, and the hinge rod 303 drives the measuring piece 204 to unfold outward synchronously. S3: When the semi-circular positioning strip 402 on the measuring piece 204 is fully in contact with the inner wall of the pipe, stop pressing down on the pipe. At this time, the locking ball 502 is locked into the slot 501 of the pulley 105 under the action of the return spring 503. The pulley 105 is fixed. Read the value of the outer diameter scale mark 109 corresponding to the reference block 107 and record the outer diameter of the pipe. S4: Read the value of the inner diameter scale mark 205 corresponding to the reference groove 401 of the measuring piece 204, and at the same time check the electronic data of the inner diameter transmitted by the displacement sensor 601 on the control panel 603. After comparing and verifying the two sets of data, record the inner diameter radius of the pipe fitting. S5: After the measurement is completed, apply an upward pulling force to the pipe fitting. When the pulling force is greater than the sum of the elastic forces of the tension spring 108 and the return spring 503, pull the pipe fitting upward. After the pipe fitting is detached, the tension spring 108 and the compression spring 305 drive each component to reset in sequence, and the device returns to its initial state, so that the next pipe fitting can be measured.

Claims

1. A device for measuring the inner and outer profiles of tubular parts, characterized in that, The utility model provides a kind of inner diameter measuring device, including mobile frame (1), vertical rod (102), frame (103), horizontal rotating rod (104), pulley (105), oblique rotating rod (106), reference block (107), tension spring (108), outer diameter scale mark (109) and inner diameter measuring component, four corners of mobile frame (1) inside are all fixed with vertical rod (102), four vertical rods (102) upper outer side are all fixed with frame (103), the upper end of vertical rod (102) is all rotationally connected with horizontal rotating rod (104), the free end of horizontal rotating rod (104) is all rotationally connected with pulley (105), the side of horizontal rotating rod (104) close to pulley (105) is all rotationally connected with oblique rotating rod (106), the upper side of vertical rod (102) is all slidably connected with reference block (107), the free end of oblique rotating rod (106) is rotationally connected with the reference block (107) of corresponding side, frame (103) bottom four corners and the reference block (107) of corresponding side between are all connected with tension spring (108), the outer side wall of vertical rod (102) upper portion is all engraved with outer diameter scale mark (109), vertical rod (102) is assembled with inner diameter measuring component.

2. A device for measuring the inner and outer profiles of a tubular part according to claim 1, characterized in that The four corners of the bottom of mobile frame (1) are all rotationally equipped with universal wheel with brake function.

3. A device for measuring the inner and outer profiles of a tubular part according to claim 2, characterized in that The outer ring of pulley (105) is sleeved with friction ring of rubber material.

4. A device for measuring the inner and outer profiles of a tubular part according to claim 3, characterized in that The inner diameter measuring component includes lifting block (201), lifting plate (202), measuring piece (204), inner diameter scale mark (205) and auxiliary assembly, the middle part of vertical rod (102) is slidably connected with lifting block (201), four lifting blocks (201) are fixedly connected with lifting plate (202), the top of lifting plate (202) is provided with four sliding grooves (203) in X-shaped distribution, each sliding groove (203) is slidably connected with measuring piece (204), the top surface of lifting plate (202) is marked with inner diameter scale mark (205) corresponding to the position of both sides of each sliding groove (203), and the bottom of lifting plate (202) is assembled with auxiliary assembly.

5. A device for measuring the inner and outer profiles of a tubular part according to claim 4, characterized in that The auxiliary assembly includes slide rail (301), sliding block (302), hinged rod (303), guide column (304) and compression spring (305), the position corresponding to four sliding grooves (203) of the bottom of lifting plate (202) is fixedly provided with slide rail (301), the slide rail (301) is slidably connected with sliding block (302), the lower end of measuring piece (204) penetrates through lifting plate (202) and is fixedly connected with corresponding sliding block (302), the bottom of sliding block (302) is rotationally connected with hinged rod (303), the middle position of the inner bottom of mobile frame (1) is fixedly connected with guide column (304), the middle part of lifting plate (202) is provided with through hole, lifting plate (202) is slidably connected with guide column (304) through the through hole, the lower end of hinged rod (303) is rotationally connected with the lower central part of guide column (304), the lower part of vertical rod (102) is sleeved with compression spring (305), and the two ends of compression spring (305) are fixedly connected with the bottom of lifting block (201) and the lower end of vertical rod (102) respectively.

6. A device for measuring the inner and outer profile of a tubular part according to claim 5, characterized in that The inner wall of the sliding groove (203) of the lifting plate (202) is embedded with graphite lubricating strips, and the contact surface of the sliding block (302) and the sliding rail (301) is provided with an oil storage groove.

7. A device for measuring the inner and outer profile of a tubular part according to claim 6, characterized in that The measuring piece (204) further comprises a semicircular positioning strip (402), the end surface of the measuring piece (204) in contact with the inner wall of the pipe is provided with the semicircular positioning strip (402), and the two side walls of the measuring piece (204) corresponding to the inner diameter scale mark (205) are provided with reference grooves (401).

8. A device for measuring the inner and outer profiles of a tubular part according to claim 7, characterized in that The pulley (105) further comprises a clamping bead (502) and a return spring (503), the two side walls of the pulley (105) are provided with a plurality of clamping grooves (501) at intervals in the circumferential direction, the horizontal rotating rod (104) is provided with an adapted mounting groove at a position corresponding to the clamping groove (501) of the two side walls of the pulley (105), the mounting groove is slidably connected with the clamping bead (502), the clamping bead (502) and the inner wall of the corresponding mounting groove are connected with the return spring (503), and the clamping bead (502) and the clamping groove (501) form a clamping connection.

9. A device for measuring the inner and outer profile of a tubular part according to claim 8, characterized in that The inner diameter measuring assembly further comprises a displacement sensor (601), a roller (602) and a control screen (603), the displacement sensor (601) is installed through the lifting block (201), the detection shaft end of the displacement sensor (601) is connected with the roller (602), the lifting block (201) is provided with an opening corresponding to the position of the vertical rod (102), the roller (602) is embedded in the opening and forms a rolling contact with the outer wall of the vertical rod (102), and the control screen (603) is installed on the right side of the front side wall of the moving frame (1). The displacement sensor (601) is electrically connected with the control screen (603).

10. A method of measuring the inner and outer profiles of a tubular part using a device for measuring the inner and outer profiles of a tubular part according to any one of claims 1 to 9, characterized in that, The steps include: S1: confirming that the device is in an initial state, i.e., the horizontal rotating rod (104) is horizontal, the bottom edge of the reference block (107) is aligned with the minimum value of the outer diameter scale mark (109), the measuring piece (204) is in an inner reset state, and the pipe to be measured is aligned with the four pulleys (105) from top to bottom, and the pipe is slowly pushed downward; S2: after the bottom surface of the pipe contacts the pulley (105), the pipe is continuously pressed downward, the horizontal rotating rod (104) is driven to rotate downward, the reference block (107) is pushed downward through the inclined rotating rod (106), the tension spring (108) is stretched, until the four pulleys (105) are tightly attached to the outer wall of the pipe, the pipe is continuously pressed downward, the lifting plate (202) is contacted and the lifting block (201) is pushed downward, the compression spring (305) is compressed, and the hinge rod (303) drives the measuring piece (204) to expand outward at the same time; S3: when the semicircular positioning strip (402) is completely abutted with the inner wall of the pipe, the pipe is stopped, at this time, the clamping bead (502) is clamped into the clamping groove (501) of the pulley (105) under the action of the return spring (503), the pulley (105) is fixed, the value of the reference block (107) corresponding to the outer diameter scale mark (109) is read, and the outer diameter of the pipe is recorded. S4: read the measuring member (204) reference groove (401) corresponding to the inner diameter scale mark (205) value, while looking at the control screen (603) on the displacement sensor (601) transmission of the inner diameter electronic data, the two groups of data collation verification record pipe diameter radius size; S5: after the measurement is completed, an upward pulling force is applied to the pipe, when the pulling force is greater than the sum of the elastic force of the tension spring (108) and the reset spring (503), the pipe is pulled out upward, and after the pipe is separated, the tension spring (108) and the compression spring (305) drive each part to reset in turn, and the device returns to the initial state, and the next pipe measurement can be performed.

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