An inner diameter measuring device for steel pipe production

Abstract

The invention discloses an inner diameter measuring device for steel pipe production, and relates to the technical field of steel pipe measurement. The device comprises a base, wherein a mounting side plate is provided on the base, a rotating measuring mechanism is provided on the mounting side plate, the rotating measuring mechanism is connected to a mounting frame, a head clamping wheel mechanism is provided on the mounting frame, the mounting frame is rotatably connected to a first threaded rod, a rotating driving mechanism is provided between the mounting frame and the first threaded rod, a positioning slide bar mechanism is provided between the first threaded rod and the mounting frame, an end clamping wheel mechanism is provided on the positioning slide bar mechanism, a telescopic measuring mechanism is provided on the first threaded rod and the positioning slide bar mechanism, and a clamping plate mechanism is provided on the base. The invention can drive the telescopic measuring mechanism to rotate and displace by arranging a rotating measuring mechanism, so as to rotationally measure the inner diameter of the steel pipe, and the first threaded rod can be driven to rotate by the rotating driving mechanism, thereby driving the telescopic measuring mechanism to move along the axial direction of the steel pipe, thereby improving the efficiency of measuring the inner diameter of the steel pipe.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe measurement, in particular to an inner diameter measuring device for steel pipe production. Background Art

[0002] Steel pipe is a steel material with a hollow cross section, whose length is much greater than its diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipes; according to the material, it is divided into carbon structural steel pipes, low alloy structural steel pipes, alloy steel pipes and composite steel pipes; according to the purpose, it is divided into steel pipes for pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, it is divided into seamless steel pipes and welded steel pipes, among which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) types, and welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes.

[0003] In the prior art, the pipe inner diameter measuring ruler can measure the inner diameter of the construction pipe. The limit rod is rotated, and the limit rod rotates and loses the restraint on the slider. The handle is pulled and rotated. When the handle is rotated to the specified position, the limit rod is rotated, and the limit rod rotates and inserts into the support block. The limit rod rotates to limit the rotation of the handle to complete the measurement. However, in the prior art, it is not convenient to limit and fix the steel pipe during the measurement process, so the measurement accuracy will be affected. Therefore, the prior art has a large room for improvement. Summary of the invention

[0004] The present invention provides an inner diameter measuring device for steel pipe production, which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for measuring inner diameter of steel pipe production comprises a base, a mounting side plate is provided on the base, a rotating measuring mechanism is provided on the mounting side plate, the rotating measuring mechanism is connected to the mounting frame, a head clamping wheel mechanism is provided on the mounting frame, the mounting frame is rotatably connected to a first threaded rod, a rotating driving mechanism is provided between the mounting frame and the first threaded rod, a positioning slide bar mechanism is provided between the first threaded rod and the mounting frame, an end clamping wheel mechanism is provided on the positioning slide bar mechanism, a telescopic measuring mechanism is provided on the first threaded rod and the positioning slide bar mechanism, and a clamping plate mechanism is provided on the base; the rotating measuring mechanism is used to drive the mounting frame to rotate and displace, the head clamping wheel mechanism and the end clamping wheel mechanism are used to clamp and fix steel pipes of different sizes, the rotating driving mechanism is used to drive the first threaded rod to rotate, the telescopic measuring mechanism is used to measure steel pipes of different inner diameter ranges, and the clamping plate mechanism is used to clamp and fix steel pipes of different outer diameters.

[0007] As a preferred technical solution of the present invention, the rotation measuring mechanism includes a motor bracket fixed on the mounting side plate, the motor bracket is fixedly connected to the first motor, the output shaft of the first motor is fixedly connected to the rotating shaft, the rotating shaft is rotatably connected to the mounting side plate, the rotating shaft is fixedly connected to the mounting frame, the rotating shaft is fixedly connected to the angle pointer, and the mounting side plate is provided with an angle scale.

[0008] As a preferred technical solution of the present invention, the head clamping wheel mechanism includes a first double-headed motor provided on a mounting frame, the output shaft of the first double-headed motor is fixedly connected to two second threaded rods, the second threaded rods are rotatably connected to the mounting frame, the second threaded rods are threadedly connected to a spacing adjustment plate, an adjustment groove is provided on the mounting frame, the spacing adjustment plate passes through the adjustment groove, the spacing adjustment plate is slidably connected to the mounting frame, the spacing adjustment plate is fixedly connected to the head clamping wheel frame, the head clamping wheel frame is rotatably connected to a plurality of head clamping wheel shafts, and the head clamping wheel shafts are fixedly connected to the cone wheel.

[0009] As a preferred technical solution of the present invention, the rotation drive mechanism includes a second motor provided on a mounting frame, the output shaft of the second motor is fixedly connected to the first gear, the first gear meshes with the second gear, and the second gear is fixed to the outside of the first threaded rod.

[0010] As a preferred technical solution of the present invention, the positioning slide rod mechanism includes a mounting plate rotatably connected to the first threaded rod, and a slide rod is fixedly connected between the mounting plate and the mounting frame.

[0011] As a preferred technical solution of the present invention, the end clamping wheel mechanism includes a hinged head hinged to the mounting plate, two hinged heads are provided, and the two hinged heads are symmetrically arranged on the mounting plate, the hinged head is fixedly connected to the end clamping wheel frame, the end clamping wheel frame is rotatably connected to the end clamping wheel, the end clamping wheel frame is fixedly connected to the first displacement seat, the first displacement seat is rotatably connected to the adjusting rod, the adjusting rod is rotatably connected to the second displacement seat, the second displacement seat is fixedly connected to the first linear motor, and the first linear motor is fixed to the mounting plate.

[0012] As a preferred technical solution of the present invention, the telescopic measuring mechanism includes a first movable plate threadedly connected to the first threaded rod, the sliding rod passes through the first movable plate and is slidably connected to the first movable plate, the first movable plate is fixedly connected to the third displacement seat, the third displacement seat is rotatably connected to the first connecting rod, the first connecting rod is rotatably connected to the fourth displacement seat, the fourth displacement seat is fixedly connected to the telescopic plate, a contact measuring head is provided on the telescopic plate, the telescopic plate is fixedly connected to the fifth displacement seat, the fifth displacement seat is rotatably connected to the second connecting rod, the second connecting rod is rotatably connected to the sixth displacement seat, the sixth displacement seat is fixedly connected to the second movable plate, the sliding rod passes through the second movable plate and is slidably connected to the second movable plate, and the second linear motor is fixedly connected between the first movable plate and the second movable plate.

[0013] As a preferred technical solution of the present invention, the clamping plate mechanism includes a mounting frame fixed on the base, a second double-headed motor is provided on the mounting frame, the output shaft of the second double-headed motor is fixedly connected to the two first rotating shafts, the first rotating shaft is fixedly connected to the first bevel gear, the first bevel gear meshes with the second bevel gear, the second bevel gear is fixedly connected to the second rotating shaft, the second rotating shaft is fixedly connected to the third bevel gear, the third bevel gear meshes with the fourth bevel gear, the fourth bevel gear is fixedly connected to the third threaded rod, the third threaded rod is threadedly connected to the threaded sleeve, the threaded sleeve is fixedly connected to the clamping plate, a rubber sheet is provided on the side of the clamping plate away from the threaded sleeve, the clamping plate and the mounting frame are slidably connected, and the clamping plate is concave in the middle.

[0014] The present invention has the following benefits:

[0015] By setting up a rotating measuring mechanism, the telescopic measuring mechanism can be driven to rotate and displace, so as to rotationally measure the inner diameter of the steel pipe. The rotating driving mechanism can drive the first threaded rod to rotate, thereby driving the telescopic measuring mechanism to move along the axial direction of the steel pipe. The telescopic measuring mechanism can measure steel pipes with different inner diameter ranges, and the clamping plate mechanism can clamp and fix steel pipes with different outer diameters. The head clamping wheel mechanism and the end clamping wheel mechanism can clamp on the steel pipe, so as to increase the stability of the measurement and improve the efficiency of the inner diameter measurement of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the structure of an inner diameter measuring device for steel pipe production.

[0017] Figure 2 This is a schematic structural diagram of the inner diameter measuring device for steel pipe production from a second perspective.

[0018] Figure 3 for Figure 2 Magnified view of area A.

[0019] Figure 4 This is a schematic structural diagram of the inner diameter measuring device for steel pipe production from the third perspective.

[0020] Figure 5 for Figure 4 Magnified view of area B.

[0021] Figure 6 This is a schematic structural diagram of the inner diameter measuring device for steel pipe production from the fourth perspective.

[0022] In the figure: 1, base; 2, mounting side plate; 3, rotation measuring mechanism; 301, motor bracket; 302, first motor; 303, rotating shaft; 304, angle pointer; 305, angle scale; 4, mounting frame; 5, head clamping wheel mechanism; 501, first double-headed motor; 502, second threaded rod; 503, spacing adjustment plate; 504, adjustment slot; 505, head clamping wheel frame; 506, head clamping wheel shaft; 507, cone wheel; 6, first threaded rod; 7, rotation driving mechanism; 701, second motor; 702, first gear; 703, second gear; 8, positioning slide rod mechanism; 801, mounting plate; 802, slide rod; 9, end clamping wheel mechanism; 901, hinge joint; 902, end clamping wheel frame; 903, end clamping wheel; 904, first displacement seat; 905, adjustment rod; 9 06, second displacement seat; 907, first linear motor; 10, telescopic measuring mechanism; 1001, first moving plate; 1002, third displacement seat; 1003, first connecting rod; 1004, fourth displacement seat; 1005, telescopic plate; 1006, contact measuring head; 1007, fifth displacement seat; 1008, second connecting rod; 1009, sixth displacement seat; 1010, second moving plate; 1011, second linear motor; 11, clamping plate mechanism; 1101, mounting frame; 1102, second double-headed motor; 1103, first rotating shaft; 1104, first bevel gear; 1105, second bevel gear; 1106, second rotating shaft; 1107, third bevel gear; 1108, fourth bevel gear; 1109, third threaded rod; 1110, threaded sleeve; 1111, clamping plate. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0024] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0025] Example 1, please refer to Figure 1-Figure 6, an inner diameter measuring device for steel pipe production, comprising a base 1, a mounting side plate 2 is provided on the base 1, a rotating measuring mechanism 3 is provided on the mounting side plate 2, the rotating measuring mechanism 3 is connected to the mounting frame 4, a head clamping wheel mechanism 5 is provided on the mounting frame 4, the mounting frame 4 is rotatably connected to the first threaded rod 6, a rotating driving mechanism 7 is provided between the mounting frame 4 and the first threaded rod 6, a positioning slide bar mechanism 8 is provided between the first threaded rod 6 and the mounting frame 4, an end clamping wheel mechanism 9 is provided on the positioning slide bar mechanism 8, a telescopic measuring mechanism 10 is provided on the first threaded rod 6 and the positioning slide bar mechanism 8, and a clamping plate mechanism 11 is provided on the base 1; the rotating measuring mechanism 3 is used to drive the mounting frame 4 to rotate and displace, the head clamping wheel mechanism 5 and the end clamping wheel mechanism 9 are used to clamp and fix steel pipes of different sizes, the rotating driving mechanism 7 is used to drive the first threaded rod 6 to rotate, the telescopic measuring mechanism 10 is used to measure steel pipes with different inner diameter ranges, and the clamping plate mechanism 11 is used to clamp and fix steel pipes with different outer diameters.

[0026] The rotation measuring mechanism 3 includes a motor bracket 301 fixed on the mounting side plate 2, the motor bracket 301 is fixedly connected to the first motor 302, the output shaft of the first motor 302 is fixedly connected to the rotating shaft 303, the rotating shaft 303 is rotatably connected to the mounting side plate 2, the rotating shaft 303 is fixedly connected to the mounting frame 4, the rotating shaft 303 is fixedly connected to the angle pointer 304, and the mounting side plate 2 is provided with an angle scale 305.

[0027] Specifically, the first motor 302 is turned on, and the rotation of the output shaft of the first motor 302 drives the rotating shaft 303 to rotate, and then drives the mounting frame 4 to rotate, so that the telescopic measuring mechanism 10 rotates and displaces, and the rotation angle of the rotating shaft 303 can be visually measured through the angle pointer 304 and the angle scale 305.

[0028] The head clamping wheel mechanism 5 includes a first double-headed motor 501 provided on the mounting frame 4, the output shaft of the first double-headed motor 501 is fixedly connected to two second threaded rods 502, the second threaded rods 502 are rotatably connected to the mounting frame 4, the second threaded rods 502 are threadedly connected to the spacing adjustment plate 503, the mounting frame 4 is provided with an adjustment groove 504, the spacing adjustment plate 503 passes through the adjustment groove 504, the spacing adjustment plate 503 is slidably connected to the mounting frame 4, the spacing adjustment plate 503 is fixedly connected to the head clamping wheel frame 505, the head clamping wheel frame 505 is rotatably connected to a plurality of head clamping wheel shafts 506, and the head clamping wheel shafts 506 are fixedly connected to the cone wheel 507.

[0029] Specifically, turning on the first double-headed motor 501 can drive the second threaded rod 502 to rotate, thereby driving the two spacing adjustment plates 503 to move closer or farther away, and then driving the head clamping wheel frame 505 to move closer or farther away, and then driving the cone wheel 507 to press against the heads of steel pipes with different diameters, so as to achieve a stable connection between the steel pipe and the device, reduce the error of inner diameter detection, and avoid interfering with the rotation of the cone wheel 507 around the axis of the steel pipe.

[0030] The rotary drive mechanism 7 includes a second motor 701 provided on the mounting frame 4, the output shaft of the second motor 701 is fixedly connected to the first gear 702, the first gear 702 meshes with the second gear 703, and the second gear 703 is fixed to the outside of the first threaded rod 6. The positioning slide rod mechanism 8 includes a mounting plate 801 rotatably connected to the first threaded rod 6, and a slide rod 802 is fixedly connected between the mounting plate 801 and the mounting frame 4. The telescopic measuring mechanism 10 includes a first movable plate 1001 threadedly connected to the first threaded rod 6, the slide rod 802 passes through the first movable plate 1001 and is slidably connected to the first movable plate 1001, the first movable plate 1001 is fixedly connected to the third displacement seat 1002, the third displacement seat 1002 is rotatably connected to the first connecting rod 1003, the first connecting rod 1003 is rotatably connected to the fourth displacement seat 1004, the fourth displacement seat 1004 is fixedly connected to the telescopic plate 1005, and the telescopic plate 1005 is provided with a connecting rod The measuring head 1006 is touched, the telescopic plate 1005 is fixedly connected to the fifth displacement seat 1007, the fifth displacement seat 1007 is rotatably connected to the second connecting rod 1008, the second connecting rod 1008 is rotatably connected to the sixth displacement seat 1009, the sixth displacement seat 1009 is fixedly connected to the second movable plate 1010, the sliding rod 802 passes through the second movable plate 1010 and is slidably connected to the second movable plate 1010, and the second linear motor 1011 is fixedly connected between the first movable plate 1001 and the second movable plate 1010.

[0031] Specifically, the second motor 701 is turned on, and the rotation of the output shaft of the second motor 701 will drive the first gear 702 to rotate. The rotation of the first gear 702 will drive the second gear 703 to rotate, and then drive the first threaded rod 6 to rotate. At this time, it can drive the first movable plate 1001 to move along the axial direction of the sliding rod 802, and then drive the contact measuring head 1006 to perform contact measurement on the circumferential inner diameter of the steel pipe.

[0032] In addition, if it is necessary to adjust the range of measuring the inner diameter of the steel pipe, the second linear motor 1011 is turned on to control the distance between the second movable plate 1010 and the first movable plate 1001. Driven by the first connecting rod 1003 and the second connecting rod 1008, the distance between the telescopic plate 1005 and the first threaded rod 6 can be adjusted to adjust the range of measuring the inner diameter of the steel pipe.

[0033] The clamping plate mechanism 11 includes a mounting frame 1101 fixed on the base 1, and a second double-headed motor 1102 is provided on the mounting frame 1101. The output shaft of the second double-headed motor 1102 is fixedly connected to two first rotating shafts 1103. The first rotating shaft 1103 is fixedly connected to the first bevel gear 1104. The first bevel gear 1104 meshes with the second bevel gear 1105. The second bevel gear 1105 is fixedly connected to the second rotating shaft 1106. The second rotating shaft 1106 is fixedly connected to the third bevel gear 1107. The third bevel gear 1107 meshes with the fourth bevel gear 1108. The fourth bevel gear 1108 is fixedly connected to the third threaded rod 1109. The third threaded rod 1109 is threadedly connected to the threaded sleeve 1110. The threaded sleeve 1110 is fixedly connected to the clamping plate 1111. A rubber sheet is provided on the side of the clamping plate 1111 away from the threaded sleeve 1110. The clamping plate 1111 is slidably connected to the mounting frame 1101, and the clamping plate 1111 is concave in the middle.

[0034] Specifically, the second double-headed motor 1102 is turned on, and the rotation of the output shaft of the second double-headed motor 1102 will drive the first rotating shaft 1103 to rotate, and then drive the first bevel gear 1104 to rotate, so as to realize the rotation of the second bevel gear 1105, thereby driving the second rotating shaft 1106 to rotate, so that the third bevel gear 1107 rotates, and drives the fourth bevel gear 1108 to rotate, thereby driving the third threaded rod 1109 to rotate, and drives the threaded sleeve 1110 to extend and retract, so as to drive the clamping plate 1111 to feed and shift, and under the action of the clamping plate 1111, the outer surface of the steel pipe can be clamped and fixed.

[0035] Example 2, continue to refer to Figure 1-Figure 4 , Figure 6 In the embodiment of the present invention, the end clamping wheel mechanism 9 includes an articulated head 901 hinged to the mounting plate 801, and two articulated heads 901 are provided. The two articulated heads 901 are symmetrically arranged on the mounting plate 801, and the articulated head 901 is fixedly connected to the end clamping wheel frame 902, and the end clamping wheel frame 902 is rotatably connected to the end clamping wheel 903, and the end clamping wheel frame 902 is fixedly connected to the first displacement seat 904, and the first displacement seat 904 is rotatably connected to the adjusting rod 905, and the adjusting rod 905 is rotatably connected to the second displacement seat 906, and the second displacement seat 906 is fixedly connected to the first linear motor 907, and the first linear motor 907 is fixed on the mounting plate 801.

[0036] Specifically, turning on the first linear motor 907 can pull the second displacement seat 906, thereby causing the adjustment rod 905 to shift, causing the end clamping wheel frame 902 to rotate around the hinge joint 901, so that the end clamping wheel 903 is clamped on the end of the steel pipe. The setting of the end clamping wheel 903 can ensure a stable connection with the steel pipe without interfering with the rotation of the end clamping wheel 903 around the axis of the steel pipe.

[0037] During the implementation of the present invention, the steel pipe is first passed through the clamping plate mechanism 11, the head of the steel pipe is limited by the head clamping wheel mechanism 5, and the tail of the steel pipe is limited by the end clamping wheel mechanism 9. At this time, opening the clamping plate mechanism 11 can clamp and fix the steel pipe. At this time, opening the rotating drive mechanism 7 can drive the first threaded rod 6 to rotate, and then realize the movement of the telescopic measuring mechanism 10 along the positioning slide rod mechanism 8, so as to measure the inner diameter of the steel pipe in the axial direction. Opening the rotating measuring mechanism 3 can drive the telescopic measuring mechanism 10 to rotate, so as to measure the circumferential inner diameter of the steel pipe, thereby measuring the internal roundness of the steel pipe.

[0038] The present invention can drive the telescopic measuring mechanism 10 to rotate and displace by setting a rotating measuring mechanism 3, so as to perform rotational measurement on the inner diameter of the steel pipe. The first threaded rod 6 can be driven to rotate by the rotating driving mechanism 7, thereby driving the telescopic measuring mechanism 10 to move along the axial direction of the steel pipe. The telescopic measuring mechanism 10 can measure steel pipes with different inner diameter ranges, and the clamping plate mechanism 11 can clamp and fix steel pipes with different outer diameters. The head clamping wheel mechanism 5 and the end clamping wheel mechanism 9 can clamp on the steel pipe, so as to increase the stability of the measurement and improve the efficiency of the inner diameter measurement of the steel pipe.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inner diameter measuring device for steel pipe production, comprising a base, characterized in that: The base is provided with an installation side plate, the installation side plate is provided with a rotation measuring mechanism, the rotation measuring mechanism is connected to the installation frame, the installation frame is provided with a head clamping wheel mechanism, the installation frame is rotatably connected to the first threaded rod, a rotation driving mechanism is provided between the installation frame and the first threaded rod, a positioning slide bar mechanism is provided between the first threaded rod and the installation frame, an end clamping wheel mechanism is provided on the positioning slide bar mechanism, a telescopic measuring mechanism is provided on the first threaded rod and the positioning slide bar mechanism, and a clamping plate mechanism is provided on the base; the rotation measuring mechanism is used to drive the installation frame to rotate and displace, the head clamping wheel mechanism and the end clamping wheel mechanism are used to clamp and fix steel pipes of different sizes, the rotation driving mechanism is used to drive the first threaded rod to rotate, the telescopic measuring mechanism is used to measure steel pipes with different inner diameter ranges, and the clamping plate mechanism is used to clamp and fix steel pipes with different outer diameters; The rotation measuring mechanism comprises a motor bracket fixed on the mounting side plate, the motor bracket is fixedly connected to the first motor, the output shaft of the first motor is fixedly connected to the rotating shaft, the rotating shaft is rotatably connected to the mounting side plate, the rotating shaft is fixedly connected to the mounting frame, the rotating shaft is fixedly connected to the angle pointer, and the mounting side plate is provided with an angle scale; The head clamping wheel mechanism comprises a first double-headed motor arranged on the mounting frame, the output shaft of the first double-headed motor is fixedly connected to two second threaded rods, the second threaded rods are rotatably connected to the mounting frame, the second threaded rods are threadedly connected to a spacing adjustment plate, the mounting frame is provided with an adjustment slot, the spacing adjustment plate passes through the adjustment slot, the spacing adjustment plate is slidably connected to the mounting frame, the spacing adjustment plate is fixedly connected to the head clamping wheel frame, the head clamping wheel frame is rotatably connected to a plurality of head clamping wheel shafts, and the head clamping wheel shafts are fixedly connected to the cone wheel; The rotary drive mechanism comprises a second motor arranged on the mounting frame, the output shaft of the second motor is fixedly connected to the first gear, the first gear meshes with the second gear, and the second gear is fixed to the outside of the first threaded rod; The positioning slide rod mechanism comprises a mounting plate rotatably connected to the first threaded rod, and a slide rod is fixedly connected between the mounting plate and the mounting frame; The end clamping wheel mechanism includes an articulated head hinged to the mounting plate, two articulated heads are provided, and the two articulated heads are symmetrically arranged on the mounting plate, the articulated head is fixedly connected to the end clamping wheel frame, the end clamping wheel frame is rotatably connected to the end clamping wheel, the end clamping wheel frame is fixedly connected to the first displacement seat, the first displacement seat is rotatably connected to the adjusting rod, the adjusting rod is rotatably connected to the second displacement seat, the second displacement seat is fixedly connected to the first linear motor, and the first linear motor is fixed to the mounting plate; The telescopic measuring mechanism includes a first movable plate threadedly connected to the first threaded rod, a sliding rod passing through the first movable plate and slidably connected to the first movable plate, the first movable plate is fixedly connected to the third displacement seat, the third displacement seat is rotatably connected to the first connecting rod, the first connecting rod is rotatably connected to the fourth displacement seat, the fourth displacement seat is fixedly connected to the telescopic plate, a contact measuring head is provided on the telescopic plate, the telescopic plate is fixedly connected to the fifth displacement seat, the fifth displacement seat is rotatably connected to the second connecting rod, the second connecting rod is rotatably connected to the sixth displacement seat, the sixth displacement seat is fixedly connected to the second movable plate, the sliding rod passes through the second movable plate and slidably connected to the second movable plate, and a second linear motor is fixedly connected between the first movable plate and the second movable plate.

2. The inner diameter measuring device for steel pipe production according to claim 1, characterized in that: The clamping plate mechanism includes a mounting frame fixed on the base, a second double-headed motor is provided on the mounting frame, the output shaft of the second double-headed motor is fixedly connected to the two first rotating shafts, the first rotating shaft is fixedly connected to the first bevel gear, the first bevel gear meshes with the second bevel gear, the second bevel gear is fixedly connected to the second rotating shaft, the second rotating shaft is fixedly connected to the third bevel gear, the third bevel gear meshes with the fourth bevel gear, the fourth bevel gear is fixedly connected to the third threaded rod, the third threaded rod is threadedly connected to the threaded sleeve, the threaded sleeve is fixedly connected to the clamping plate, a rubber sheet is provided on the side of the clamping plate away from the threaded sleeve, the clamping plate and the mounting frame are slidably connected, and the clamping plate is concave in the middle.

Images