Automatic measuring device for inner and outer diameter ovality of steel pipe

Abstract

The present invention provides an automatic measuring device based on the ovality of the inner and outer diameters of steel pipes, comprising a trolley, a height opening and closing device provided on the trolley, arc-shaped slideways provided at the top and bottom of the height opening and closing device, a sliding upper measuring car provided on the arc-shaped slideway at the top, and a lower measuring car provided on the arc-shaped slideway at the bottom, the upper measuring car and the lower measuring car rest on the steel pipe, and a limit sensor is provided between the upper measuring car and the lower measuring car; the steel pipe rests on a plurality of rollers. The overall device can measure the ovality of the inner and outer diameters of the steel pipe, and the overall device does not need to determine the axis of the irregularly shaped steel pipe, and does not require the complex preliminary process of aligning the axis of the measuring device with the axis of the steel pipe. The overall structure is simple, easy to operate, and has low requirements for on-site staff. At the same time, the measurement efficiency is high, the degree of automation is high, the safety risk is low, and the measurement is relatively accurate. The overall structural equipment cost is low and has great promotion value.

Description

Technical Field

[0001] The invention relates to the field of steel pipe measurement, in particular to an automatic measuring device based on the inner and outer diameter ovality of a steel pipe. Background Art

[0002] At present, on domestic steel pipe production lines, steel pipes need to be calibrated after the ovality exceeds the standard. In areas requiring higher precision, the ovality of the inner and outer diameters of steel pipes will be required to be within a certain range. To measure whether the ovality of the outer diameter of the steel pipe is qualified, some existing measurement methods use manual measurement. Generally, a steel tape measure is used to directly measure the outer diameter of the end section of the steel pipe up and down, left and right. Whether the diameter of each point on the circumference is consistent is used to judge whether the ovality of the steel pipe meets the requirements. When calibrating the ovality of the inner diameter of the steel pipe, the inner diameter of the steel pipe is measured with a steel tape measure in the same way. The entire process is mainly completed manually. Although the cost is low, the measurement efficiency is low, the labor intensity is high, the safety risk is high, and the measurement is not accurate.

[0003] At some existing steel pipe production sites, laser scanning sensor technology is used to measure the inner and outer diameter ovality of steel pipes. Laser scanning transmits the steel pipe's shape to a computer, which then analyzes the ovality. However, this requires on-site staff to operate laser instruments, computer analysis equipment, and computer operating software, which places high demands on the staff. Furthermore, the equipment used to measure steel pipes using laser scanning sensor technology is complex, expensive, and requires high operating and maintenance costs. Therefore, we propose an automatic measurement device for the inner and outer diameter ovality of steel pipes to address these issues.

[0004] Chinese patent document CN 102650516 A describes a method and device for online measurement of the outer diameter and ovality of large-diameter steel pipe ends. The method first obtains the nominal data of the steel pipe to be measured, and then determines the axis position. The spacing of the outer diameter laser displacement sensor is then set, and the sensor probe is aligned with the axis. Measurement begins to obtain the diameter D of the steel pipe to be measured, and the outer diameter along the entire circumference is obtained by rotation 180 degrees. The average diameter and ovality of the steel pipe to be measured are then calculated. A device for online measurement of the outer diameter and ovality of large-diameter steel pipe ends is characterized by comprising an industrial robot, an outer diameter measuring device, and an axis detection device. The present invention employs a standard industrial robot carrying a measuring device to circumscribe the end of the steel pipe to be measured. The measurement utilizes non-contact measurement technology, resulting in high accuracy and high speed. However, this device cannot measure the inner diameter of steel pipes and is not suitable for applications where the ovality of both the inner and outer diameters of steel pipes must meet a certain range. Furthermore, the device is complex in structure, making it difficult to determine the axis of irregularly shaped steel pipes. This device measures the diameter D of the steel pipe by determining the axis, resulting in inaccurate measurements. The device is complex, costly, and has drawbacks, requiring improvement. Summary of the Invention

[0005] The present invention provides an automatic measuring device based on the inner and outer diameter ovality of steel pipes, which solves the problems of low efficiency, high labor intensity and inaccurate measurement of manual measurement; laser scanning measurement has high requirements for staff, which are difficult for existing staff to meet, and the measuring equipment is complex and costly; and it cannot measure the inner and outer diameter ovality of steel pipes at the same time.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: based on the automatic measuring device for the inner and outer diameter ovality of steel pipes, the trolley includes a height opening and closing device, the top and bottom ends of the height opening and closing device are provided with arc-shaped slides, the top arc-shaped slide is provided with a sliding upper measuring car, the bottom arc-shaped slide is provided with a lower measuring car, the upper and lower measuring cars are against the steel pipe, and a limit sensor is provided between the upper and lower measuring cars;

[0007] The steel pipe rests against a number of rollers.

[0008] In the preferred solution, the height opening and closing device includes a hollow support box, a rotating bidirectional screw is provided on the support box, a driven bevel gear is provided on the bidirectional screw, and a meshing active bevel gear is provided on one side of the driven bevel gear. The trolley includes multiple handles.

[0009] In the preferred solution, the support box is connected to the pillar on the trolley, the support box is provided with a first through hole, the support box is provided with multiple second through holes, a lifting motor is installed on the pillar, the output shaft of the lifting motor is connected to the driving bevel gear, the driven bevel gear is installed in the support box, and the driving bevel gear is rotatably connected to the support box.

[0010] In a preferred embodiment, the arc-shaped slideway includes an arc-shaped slide rail with a T-shaped cross section, an arc-shaped plate is provided on one side of the arc-shaped slide rail, a plurality of slide posts are provided on the arc-shaped plate, the slide posts abut against the second through hole, a threaded hole is provided on the arc-shaped plate, and the threaded hole is threadedly connected to the bidirectional screw rod;

[0011] Limiting plates are provided at both ends of the arc-shaped slide rail, and a limiting arc plate is provided on the side of the top end of the arc-shaped slide rail. The roller slides on the limiting arc plate relative to the inner side of the arc-shaped slide rail.

[0012] In the preferred solution, the upper test vehicle includes an upper vehicle body, which rests on an arc-shaped slide, a turntable rotatably connected to the upper vehicle body is provided on one side of the upper vehicle body, a first motor is provided on the upper vehicle body, and the output shaft of the first motor passes through the upper vehicle body and is connected to the turntable, a rest device is provided at one end of the turntable, and mounting rods are provided on both sides of the rest device.

[0013] In the preferred solution, multiple rollers are provided on one side of the upper body, and the rollers are rotatably connected to the upper body through a rotating shaft. A slave gear is provided on the rotating shaft of the roller, and a meshing main gear is provided on the slave gear. A second motor is installed on the upper body, and the output shaft of the second motor is connected to the main gear.

[0014] In the preferred embodiment, the abutment device includes an outer sleeve, a sliding inner slide is provided on the outer sleeve, a spring and an attraction electromagnetic valve are provided between the outer sleeve and the inner slide, and the two ends of the spring and the attraction electromagnetic valve are respectively installed on the outer sleeve and the inner slide.

[0015] In the preferred solution, the structure of the lower measuring vehicle is the same as that of the upper measuring vehicle, and a mounting plate is provided on the abutting device of the lower measuring vehicle, and mounting holes are respectively provided on both sides of the mounting plate;

[0016] The opening direction of the mounting hole on the side away from the steel pipe is consistent with the direction of the abutment device.

[0017] In the preferred solution, the limit sensor includes a limit sensor body, a mounting tube is provided at the bottom of the limit sensor body, the limit sensor body and the mounting tube are hinged, the mounting tube is installed on the mounting hole, a rotating ring is provided at the top of the limit sensor body, the rotating ring is rotatably connected to the mounting rod, and a digital display for displaying the measured distance is provided on the limit sensor body.

[0018] The beneficial effects of the present invention are as follows: the height opening and closing device can be adjusted to enable the entire device to measure the ovality of steel pipes of different diameters. The electromagnetic valve is opened and closed to allow the abutment devices of the upper and lower measuring carriages to abut against the steel pipe, and the limit sensors located at both ends of the upper and lower measuring carriages can measure the ovality of the steel pipe.

[0019] The abutment device can abut against the outer diameter or inner diameter of the steel pipe. The mounting rods at both ends of the abutment device of the upper measuring car and the mounting holes on both sides of the mounting plate of the lower measuring car are provided to adapt to the different situations of measuring the inner and outer diameters of the steel pipe by the upper and lower measuring cars, so that the overall device can measure the ovality of the inner and outer diameters of the steel pipe.

[0020] The limit sensor body is hinged to the mounting tube, the mounting tube is installed on the mounting hole, and the rotating ring is installed on the mounting rod, so that when the upper measuring vehicle slides on the curved slide, the limit sensor body can continue to measure without breaking, and the digital display can facilitate on-site readings by staff.

[0021] The integrated device can measure the ovality of both the inner and outer diameters of steel pipes and is also suitable for applications requiring high ovality standards for both the inner and outer diameters. It eliminates the need to determine the axis of irregularly shaped pipes, nor does it require the complex initial process of aligning the measuring device's axis with the pipe's. It can accurately measure the ovality of steel pipes even when there is a significant error between the axis of a curved slide and the pipe's axis. Measurement is performed using a trolley, making it convenient, fast, and easy to operate.

[0022] The overall structure is simple, easy to operate, and requires minimal on-site staff knowledge of computer software and analysis. It also offers high measurement efficiency, a high degree of automation, minimal safety risks, and relatively accurate measurements. Furthermore, the overall structure is less expensive than laser scanning measurement equipment, reducing operating and maintenance costs for businesses and offering significant promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples;

[0024] Figure 1 It is a front view of the overall structure of the present invention for measuring the outer diameter ovality;

[0025] Figure 2 It is a front view of the overall structure of the present invention for measuring the inner diameter ellipticity;

[0026] Figure 3 This invention Figure 2 A magnified view of center A;

[0027] Figure 4 This invention Figure 2 Magnified view of middle B;

[0028] Figure 5 It is an axonometric view of the overall structure of the present invention;

[0029] Figure 6 It is an axonometric view of a partial structure of the present invention;

[0030] Figure 7 is an exploded view of the height opening and closing device of the present invention;

[0031] Figure 8 It is an axonometric view of two curved slideways of the present invention;

[0032] Figure 9 It is an axle-side view of the test vehicle of the present invention;

[0033] Figure 10 It is an axle-side view of the lower test vehicle of the present invention;

[0034] Figure 11 is an axonometric view of the limit sensor of the present invention;

[0035] Figure 12 is a cross-sectional view of the abutment device of the present invention;

[0036] Figure: trolley 1; handle 101; support column 102; height adjustment device 2; support box 201; first through hole 2011; second through hole 2012; bidirectional screw 202; driven bevel gear 203; driving bevel gear 204; arc slide 3; arc slide rail 301; arc plate 302; threaded hole 303; slide column 304; limit plate 305; limit arc plate 306; upper measuring vehicle 4; upper vehicle body 401; turntable 402; abutment device 403 ; Outer sleeve 4031; Inner slide 4032; Spring 4033; Attracting solenoid valve 4034; Mounting rod 404; First motor 405; Roller 406; Slave gear 407; Main gear 408; Second motor 409; Lower measuring vehicle 5; Mounting plate 504; Mounting hole 5041; Lifting motor 6; Limit sensor 7; Limit sensor body 701; Mounting cylinder 702; Rotating ring 703; Digital display 704; Steel pipe 8; Roller 9. DETAILED DESCRIPTION

[0037] Example 1:

[0038] like Figure 1-12 In the embodiment, the automatic measuring device for the ovality of the inner and outer diameters of steel pipes includes a trolley 1, a height opening and closing device 2 is provided on the trolley 1, and an arc-shaped slideway 3 is provided at the top and bottom of the height opening and closing device 2. A sliding upper measuring trolley 4 is provided on the arc-shaped slideway 3 at the top, and a lower measuring trolley 5 is provided on the arc-shaped slideway 3 at the bottom. The upper measuring trolley 4 and the lower measuring trolley 5 are against the steel pipe 8, and a limit sensor 7 is provided between the upper measuring trolley 4 and the lower measuring trolley 5;

[0039] The steel pipe 8 rests against the plurality of rollers 9. With this structure, the lifting motor 6 is driven to rotate the driving bevel gear 204, which in turn rotates the driven bevel gear 203, which in turn rotates the bidirectional screw rod 202, which in turn causes the plurality of slide posts 304 on the arcuate slideway 3 to slide on the second through-hole 2012, thereby opening and closing the two arcuate slideways 3 on the height opening and closing device 2, thereby enabling the entire device to adjust the height and measure the ovality of steel pipes 8 of different diameters.

[0040] Drive the second motor on the lower measuring car 5 to rotate the roller on the lower measuring car 5 so that the lower measuring car 5 is located at the bottom of the steel pipe 8, turn off the second motor on the lower measuring car 5 to fix the lower measuring car 5 relative to the steel pipe 8, drive the second motor 409 on the upper measuring car 4 to rotate the main gear 408 to rotate the slave gear 407 to rotate the roller 406 to enable the upper measuring car 4 to slide on the arc slide 3 track, close the suction solenoid valve 4034 to make the abutment devices of the upper measuring car 4 and the lower measuring car 5 abut against the steel pipe 8, and the limit sensors 7 located at both ends of the upper measuring car 4 and the lower measuring car 5 can measure the ovality of the steel pipe 8.

[0041] Both the upper measuring car 4 and the lower measuring car 5 are provided with a first motor, which drives the first motors on the upper measuring car 4 and the lower measuring car 5 to rotate the abutting devices on the upper measuring car 4 and the lower measuring car 5, so that the abutting devices on the upper measuring car 4 and the lower measuring car 5 can abut against the outer diameter or inner diameter of the steel pipe 8. The mounting rods 404 at both ends of the abutting device 403 of the upper measuring car 4 and the mounting holes 5041 are set on both sides of the mounting plate 504 of the lower measuring car 5 to adapt to the different situations of the upper measuring car 4 and the lower measuring car 5 measuring the inner and outer diameters of the steel pipe 8, so that the overall device can measure the ovality of the inner and outer diameters of the steel pipe 8.

[0042] The limit sensor body 701 is hinged to the mounting tube 702, the mounting tube 702 is installed on the mounting hole 5041, and the rotating ring 703 is installed on the mounting rod 404, so that when the upper measuring vehicle 4 slides on the arc slide 3, the limit sensor body 701 can continue to measure without breaking, and the digital display 704 can facilitate on-site readings by staff.

[0043] The overall device can measure the ovality of both the inner and outer diameters of the steel pipe 8, and is also suitable for situations where high standards of ovality are required for both the inner and outer diameters of the steel pipe 8. The overall device does not require determining the axis of the irregularly shaped steel pipe 8, nor does it require the complex initial process of aligning the axis of the measuring device with the axis of the steel pipe 8. It can also accurately measure the ovality of the steel pipe 8 even when there is a large error between the axis of the curved slide 3 and the axis of the steel pipe 8. Measurement using the trolley 1 is convenient, fast, and easy to operate.

[0044] The overall structure is simple and easy to operate, requiring minimal on-site staff knowledge of computer software and analysis. It also boasts high measurement efficiency, a high degree of automation, minimal safety risks, and relatively accurate measurements. Compared to laser scanning measurement equipment, the overall structure is less expensive, reducing operating and maintenance costs for businesses and paving the way for widespread adoption.

[0045] In a preferred embodiment, the height adjustment device 2 includes a hollow support box 201, on which is mounted a rotating bidirectional screw 202, which is equipped with a driven bevel gear 203. A meshing driving bevel gear 204 is provided on one side of the driven bevel gear 203. The trolley 1 includes multiple handles 101. With this structure, the lifting motor 6 is driven to rotate the driving bevel gear 204, which in turn rotates the driven bevel gear 203, which in turn rotates the bidirectional screw 202, which in turn causes the multiple slide posts 304 on the curved slide 3 to slide on the second through-holes 2012, thereby opening and closing the two curved slides 3 on the height adjustment device 2, allowing the entire device to adjust its height and measure the ovality of steel pipes 8 of different diameters. The handles 101 facilitate operator operation.

[0046] In a preferred embodiment, the support box 201 is connected to the support column 102 on the trolley 1. The support box 201 is provided with a first through hole 2011 and a plurality of second through holes 2012. The support column 102 is provided with a lifting motor 6. The output shaft of the lifting motor 6 is connected to the driving bevel gear 204. The driven bevel gear 203 is mounted in the support box 201, and the driving bevel gear 204 is rotationally connected to the support box 201. With this structure, the driven bevel gear 203 is rotationally connected to the support box 201 by abutting against the first through hole 2011. The driving bevel gear 204 and the driven bevel gear 203 are mounted in the support box 201.

[0047] In a preferred embodiment, the arc-shaped slideway 3 includes an arc-shaped slide rail 301 with a T-shaped cross section. A curved plate 302 is provided on one side of the arc-shaped slide rail 301. A plurality of slide posts 304 are provided on the curved plate 302. The slide posts 304 abut against the second through holes 2012. A threaded hole 303 is provided on the curved plate 302. The threaded hole 303 is threadedly connected to the bidirectional screw rod 202.

[0048] Limit plates 305 are installed at both ends of the curved slide rail 301. A limit arc plate 306 is installed on the side of the top end of the curved slide rail 301. Rollers 406 slide on the limit arc plates 306 relative to the inner side of the curved slide rail 301. With this structure, the curved slide rail 301 has a T-shaped cross-section. The limit arc plates 306 are installed on one side of the curved slide rail 301, allowing the multiple rollers on the upper and lower test carriages 4 and 5 to slide against the inner side of the limit arc plates 306. The limit arc plates 306 can limit the multiple rollers on the upper and lower test carriages 4 and 5. The limit plates 305 on both sides of the curved slide rail 301 prevent the upper and lower test carriages 4 and 5 from falling off the curved slide 3. The upper car body 401 is an arc-shaped structure, and the inner diameter of the upper car body 401 abuts against the outer diameter of the curved slide rail 301. This allows the upper measuring vehicle 4 and the lower measuring vehicle 5 to slide on the arc-shaped slideway 3 conveniently and quickly.

[0049] In a preferred embodiment, the upper measuring vehicle 4 includes an upper vehicle body 401, which rests on the curved slideway 3. A turntable 402 is provided on one side of the upper vehicle body 401, rotatably connected to the upper vehicle body 401. A first motor 405 is provided on the upper vehicle body 401, and the output shaft of the first motor 405 passes through the upper vehicle body 401 and is connected to the turntable 402. A stop device 403 is provided at one end of the turntable 402, and mounting rods 404 are provided on either side of the stop device 403. With this structure, the first motors on the upper measuring vehicle 4 and the lower measuring vehicle 5 are driven to rotate the turntable, which in turn rotates the stop device, allowing the stop device to rest against the inner diameter or outer diameter of the steel pipe 8. This allows the entire device to measure the ovality of both the inner and outer diameters of the steel pipe 8.

[0050] In a preferred embodiment, a plurality of rollers 406 are provided on one side of the upper body 401. The rollers 406 are rotatably connected to the upper body 401 via a rotating shaft. A slave gear 407 is provided on the rotating shaft of the roller 406, and a master gear 408 is meshed with the slave gear 407. A second motor 409 is mounted on the upper body 401, and the output shaft of the second motor 409 is connected to the master gear 408. With this structure, the second motor 409 is driven to slide the upper body 401 on the curved slide 3. The second motor 409 is turned off to fix the upper body 401 relative to the curved slide 3, thereby fixing the upper body 401 relative to the steel pipe 8.

[0051] In a preferred embodiment, the abutment device 403 includes an outer sleeve 4031, on which a sliding inner slide 4032 is disposed. A spring 4033 and an electromagnetic valve 4034 are disposed between the outer sleeve 4031 and the inner slide 4032. The ends of the spring 4033 and the electromagnetic valve 4034 are respectively mounted on the outer sleeve 4031 and the inner slide 4032. With this structure, the electromagnetic valve 4034 is opened to tighten the electromagnetic valve 4034, thereby retracting the inner slide 4032. The electromagnetic valve 4034 is closed to allow the inner slide 4032 to slide out. The inner slide 4032 abuts against the steel pipe 8 under the action of the spring 4033.

[0052] In the preferred embodiment, the structure of the lower measuring vehicle 5 is the same as that of the upper measuring vehicle 4. The abutting device of the lower measuring vehicle 5 is provided with a mounting plate 504, and mounting holes 5041 are respectively provided on both sides of the mounting plate 504.

[0053] The opening direction of the mounting hole 5041 on the side away from the steel pipe 8 is consistent with the direction of the abutment device. With this structure, when the entire device measures the ovality of the outer diameter of the steel pipe 8, the mounting cylinder 702 is installed in the mounting hole 5041 on the side away from the steel pipe 8, and the rotating ring 703 is installed on the mounting rod 404 on the side away from the steel pipe 8.

[0054] When the entire device measures the ovality of the inner diameter of the steel pipe 8, the mounting cylinder 702 is mounted on the mounting hole 5041 near the side of the steel pipe 8, and the rotating ring 703 is mounted on the mounting rod 404 near the side of the steel pipe 8. The entire device can measure the inner and outer diameter ovality of the steel pipe 8.

[0055] In a preferred embodiment, the limit sensor 7 includes a limit sensor body 701, a mounting tube 702 being provided at the bottom of the limit sensor body 701, the limit sensor body 701 being hingedly connected to the mounting tube 702, and the mounting tube 702 being mounted in the mounting hole 5041. A rotating ring 703 is provided at the top of the limit sensor body 701, and the rotating ring 703 is rotatably connected to the mounting rod 404. A digital display 704 for displaying the measured distance is provided on the limit sensor body 701. With this structure, the limit sensor body 701 is hingedly connected to the mounting tube 702, the mounting tube 702 is mounted in the mounting hole 5041, and the rotating ring 703 is mounted on the mounting rod 404. This ensures that the limit sensor body 701 can continue to measure without breaking when the upper measuring vehicle 4 slides on the curved slide 3, and the digital display 704 facilitates on-site readings by personnel.

[0056] Example 2: Further illustrate with reference to Example 1. Figure 1 、 5 -12:

[0057] When the overall device measures the outer diameter of the steel pipe 8, the direction of the abutment device is adjusted by the first motor of the upper measuring car 4 and the lower measuring car 5 so that the abutment device on the upper measuring car 4 faces downward and the abutment device on the lower measuring car 5 faces upward, the mounting cylinder 702 is mounted on the mounting hole 5041 on the side away from the steel pipe 8, and the rotating ring 703 is mounted on the mounting rod 404 on the side away from the steel pipe 8.

[0058] 1. Open the suction solenoid valves on the upper measuring car 4 and the lower measuring car 5 to retract the abutment device, drive the lifting motor 6 to rotate the active bevel gear 204, so that the driven bevel gear 203 rotates, so that the bidirectional screw rod 202 rotates, so that the multiple slide posts 304 on the arc slide 3 slide on the second through hole 2012, so that the two arc slides 3 on the height opening and closing device 2 adjust the height, so that the abutment devices on the upper measuring car 4 and the lower measuring car 5 are located outside the steel pipe 8, close the suction solenoid valve to make the abutment device abut against the steel pipe 8, drive the second motor 409 on the lower measuring car 5 to move the lower measuring car 5 to the lower position of the arc slide 3, stop the second motor on the lower measuring car 5 to fix the lower measuring car 5, drive the second motor 409 on the upper measuring car 4 to make the upper measuring car 4 slide on the arc slide 3, and the limit sensor 7 displays the distance value of the lower measuring car 5 abutting the steel pipe 8.

[0059] 2. Open the suction solenoid valves on the upper measuring car 4 and the lower measuring car 5 to retract the abutment device, drive the roller 9 to rotate the steel pipe 8 on the roller 9, close the suction solenoid valves on the upper measuring car 4 and the lower measuring car 5 to make the abutment device abut against the steel pipe 8, and repeatedly measure the distance value of the lower measuring car 5 abutting against the point on the steel pipe 8.

[0060] 3. Repeat steps 1 and 2 to measure the distances of multiple points on the steel tube 8 , thereby determining the ovality of the steel tube 8 .

[0061] Example 3: Further illustrate with reference to Examples 1-2. Figure 2-12 :

[0062] When the overall device measures the inner diameter of the steel pipe 8, the direction of the abutment device is adjusted by the first motor of the upper measuring car 4 and the lower measuring car 5 so that the abutment device on the upper measuring car 4 faces upward and the abutment device on the lower measuring car 5 faces downward, the mounting cylinder 702 is installed on the mounting hole 5041 close to the side of the steel pipe 8, and the rotating ring 703 is installed on the mounting rod 404 close to the side of the steel pipe 8.

[0063] The specific device operation mode is consistent with Example 2.

[0064] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. Based on the automatic measuring device of the inner and outer diameter ovality of steel pipe, its characteristics are: The trolley (1) is provided with a height opening and closing device (2), the top and bottom ends of the height opening and closing device (2) are both provided with arc-shaped slideways (3), the top arc-shaped slideway (3) is provided with a sliding upper measuring car (4), the bottom arc-shaped slideway (3) is provided with a lower measuring car (5), the upper measuring car (4) and the lower measuring car (5) are abutted against a steel pipe (8), and a limit sensor (7) is provided between the upper measuring car (4) and the lower measuring car (5); The steel pipe (8) rests on a plurality of rollers (9); A plurality of rollers (406) are provided on one side of the upper vehicle body (401), and the rollers (406) are rotatably connected to the upper vehicle body (401) via a rotating shaft. A slave gear (407) is provided on the rotating shaft of the rollers (406), and a meshing main gear (408) is provided on the slave gear (407). A second motor (409) is installed on the upper vehicle body (401), and an output shaft of the second motor (409) is connected to the main gear (408). The abutting device (403) includes an outer sleeve (4031), a sliding inner slide (4032) is provided on the outer sleeve (4031), a spring (4033) and an attraction electromagnetic valve (4034) are provided between the outer sleeve (4031) and the inner slide (4032), and two ends of the spring (4033) and the attraction electromagnetic valve (4034) are respectively installed on the outer sleeve (4031) and the inner slide (4032); The structure of the lower measuring vehicle (5) is the same as that of the upper measuring vehicle (4). A mounting plate (504) is provided on the abutting device of the lower measuring vehicle (5), and mounting holes (5041) are respectively provided on both sides of the mounting plate (504). The opening direction of the mounting hole (5041) on the side away from the steel pipe (8) is consistent with the direction of the abutment device; The limit sensor (7) comprises a limit sensor body (701), a mounting tube (702) being provided at the bottom of the limit sensor body (701), the limit sensor body (701) being hinged to the mounting tube (702), the mounting tube (702) being mounted on the mounting hole (5041), a rotating ring (703) being provided at the top of the limit sensor body (701), the rotating ring (703) being rotatably connected to the mounting rod (404), and a digital display (704) for displaying the measured distance being provided on the limit sensor body (701); The upper test vehicle (4) includes an upper vehicle body (401), the upper vehicle body (401) abuts against the arc-shaped slideway (3), a turntable (402) rotatably connected to the upper vehicle body (401) is provided on one side of the upper vehicle body (401), a first motor (405) is provided on the upper vehicle body (401), an output shaft of the first motor (405) passes through the upper vehicle body (401) and is connected to the turntable (402), an abutting device (403) is provided at one end of the turntable (402), and mounting rods (404) are provided on both sides of the abutting device (403).

2. The automatic measuring device for the inner and outer diameter ovality of a steel pipe according to claim 1, characterized in that: The height opening and closing device (2) comprises a hollow support box (201), a rotating bidirectional screw rod (202) is provided on the support box (201), a driven bevel gear (203) is provided on the bidirectional screw rod (202), and a meshing driving bevel gear (204) is provided on one side of the driven bevel gear (203), and the trolley (1) comprises a plurality of handles (101).

3. The automatic measuring device for the inner and outer diameter ovality of a steel pipe according to claim 2, characterized in that: The support box (201) is connected to the support column (102) on the trolley (1); a first through hole (2011) is provided on the support box (201); a plurality of second through holes (2012) are provided on the support box (201); a lifting motor (6) is installed on the support column (102); an output shaft of the lifting motor (6) is connected to the driving bevel gear (204); a driven bevel gear (203) is installed in the support box (201); and the driving bevel gear (204) is rotatably connected to the support box (201).

4. The automatic measuring device for the inner and outer diameter ovality of a steel pipe according to claim 3 is characterized in that: The arc-shaped slideway (3) comprises an arc-shaped slide rail (301) with a T-shaped cross section, an arc-shaped plate (302) being provided on one side of the arc-shaped slide rail (301), a plurality of slide posts (304) being provided on the arc-shaped plate (302), the slide posts (304) being abutted against the second through hole (2012), a threaded hole (303) being provided on the arc-shaped plate (302), and the threaded hole (303) being threadedly connected to the bidirectional screw rod (202); Limiting plates (305) are provided at both ends of the arc-shaped slide rail (301), and a limiting arc plate (306) is provided on the side surface of the top end of the arc-shaped slide rail (301). The roller (406) slides on the limiting arc plate (306) relative to the inner side of the arc-shaped slide rail (301).

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