Large-caliber seamless tube inner diameter measuring device

Abstract

The utility model discloses an inner diameter measuring device for a large-diameter seamless tube. The inner diameter measuring device comprises a shell, a supporting ball, a screw rod, a spring, a pressing rod, a universal ball, a mounting frame and a laser displacement sensor, the bottom of the shell is provided with a mounting bottom plate, the left and right sides of the mounting bottom plate are respectively provided with two threaded holes, the bottom is provided with a measuring hole, the right side wall is provided with a rectangular through hole, and the top is provided with a sliding through hole; one end of the screw rod is mounted on the threaded hole, and the supporting ball is connected to the other end of the screw rod; the mounting rack is located in the shell, and the right side of the mounting rack is located at the rectangular through hole; two ends of the spring are respectively connected with the mounting baseplate and the bottom of the mounting rack; the bottom end of the pressing rod penetrates through the sliding through hole to be connected to the top of the mounting frame. The universal ball is connected to the top end of the pressing rod. The laser displacement sensor is installed in the installation frame and located over the measuring hole. According to the utility model, the problems of large measuring tool appearance, easy deformation, large introduced error and the like in seamless tube inner diameter detection can be solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipe diameter measuring device field, concretely relates to a large -diameter seamless pipe inner diameter measuring device. BACKGROUND

[0002] The laser displacement sensor is a sensor for measuring by laser technology, which is composed of a laser, a laser detector and a measuring circuit, and can accurately and non-contact measure the position and displacement of the measured object. It can measure displacement, thickness, vibration, distance, diameter and other precise geometric measurements.

[0003] Seamless pipes are made of whole round steel perforation, and have no welds on the surface, with a maximum diameter of 900mm and a minimum diameter of 4mm. They are widely used in oil and gas exploration, chemical industry, military weapons, nuclear industry and other fields. In order to ensure the good concentricity and sealing of the connection of the steel pipe, it is necessary to first ensure that the inner and outer diameters, ovality and wall thickness before machining meet the specified indicators, otherwise it is difficult to ensure the precision requirements of machining and butt joint.

[0004] During the machining process of the steel pipe, the outer diameter and inner diameter of the cut steel pipe are usually measured, and the inner diameter of various large-diameter pipes is mostly measured by an inner diameter gauge. However, the error of the inner diameter gauge measurement is large, and the measurement stability cannot be guaranteed. Due to the measurement range being exceeded, the existing inductive diameter measuring instrument and non-contact diameter measuring instrument cannot measure the inner diameter of large-diameter seamless pipes.

[0005] At present, there is an urgent need for a large-diameter seamless pipe inner diameter measuring device suitable for various on-site super-large-diameter seamless pipes, which can provide accurate and reliable measurement data for the development of super-large-diameter seamless pipes to meet the actual production and processing needs. It can solve the problems of large measuring tool deformation and large personnel introduction error caused by the original inner diameter gauge detection method of large-diameter seamless pipes. Utility model content

[0006] The utility model aims at providing a large-diameter seamless pipe inner diameter measuring head, which can solve the problems of large measuring tool deformation, large error and other problems existing in the inner diameter detection of seamless pipes.

[0007] The technical scheme is as follows:

[0008] Large-diameter seamless pipe inner diameter measuring device, including: shell, support ball, screw, spring, pressure bar, universal ball, mounting bracket, laser displacement sensor, the bottom of shell is provided with mounting base, the left and right sides of mounting base are respectively provided with two threaded holes, the bottom is provided with measuring hole, the right side wall is provided with rectangular hole, the top is provided with sliding hole;One end of screw is installed on threaded hole, support ball is connected at the other end of screw, measuring hole is located at the middle position of four support balls;Spring, mounting bracket are located in the inside of shell, the right side of mounting bracket is located at rectangular hole;The both ends of spring are connected mounting base, the bottom of mounting bracket respectively;The bottom end of pressure bar passes through sliding hole and is connected at the top of mounting bracket, universal ball is connected at the top end of pressure bar;Laser displacement sensor is installed in the inside of mounting bracket, and laser displacement sensor is located just above measuring hole.

[0009] Further, the four threaded holes are located on the same plane, and the four support balls are located on the same plane.

[0010] Further, the centers of the four support balls are located at the four vertex positions of the rectangle, and the laser head of the laser displacement sensor is located just above the intersection point of the diagonal lines of the rectangle.

[0011] Further, the top of the sliding hole is provided with a positioning sleeve, and the pressure bar is arranged in the positioning sleeve.

[0012] Further, the inner diameters of the positioning sleeve and the sliding hole are the same, and the outer diameter of the pressure bar is the same as the inner diameter of the positioning sleeve.

[0013] Further, the signal line of the laser displacement sensor is led out from the rectangular hole.

[0014] Further, the bottom of the mounting bracket is provided with a limiting hole, and the mounting base is provided with a limiting rod arranged in the limiting hole.

[0015] The utility model has the following advantages compared with the prior art:

[0016] The utility model can solve the problems of large gauge shape, easy deformation, large error introduction and the like in the inner diameter table detection of large-diameter seamless pipes.

[0017] The utility model measures the inner diameter of the seamless pipe by using the chord length method, effectively reduces the volume and weight of the support, achieves the purpose of light weight, and solves the problem of inner diameter detection of the seamless pipe.

[0018] The universal ball is installed at the top of the pressure bar extension rod to increase the contact pipe wall area and avoid the pushing force brought by the measuring head from causing the support ball to not stably contact the inner wall of the seamless pipe.

[0019] The pressure bar makes the support ball contact the inner wall of the seamless pipe through the spring, prevents the support ball from being raised during measurement, and causes the measurement result to be inaccurate. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the structural principle diagram of the large-diameter seamless pipe inner diameter measuring device in the utility model;

[0021] Figure 2 is the measurement principle diagram of the large-diameter seamless pipe inner diameter measuring device in the utility model. DETAILED DESCRIPTION

[0022] The following description fully illustrates specific embodiments of the utility model to enable one of ordinary skill in the art to practice and reproduce the same.

[0023] As Figure 1 shown, it is the structural principle diagram of the large-diameter seamless pipe inner diameter measuring device in the utility model.

[0024] The large-diameter seamless pipe inner diameter measuring device comprises a shell 1, a supporting ball 2, a screw rod 3, a spring 4, a pressing rod 5, a universal ball 6, a mounting frame 7 and a laser displacement sensor.

[0025] The shell 1 is provided with a mounting bottom plate 11 at the bottom, two threaded holes are arranged at the left and right sides of the mounting bottom plate 11 respectively, a measuring hole 12 is arranged at the bottom, a rectangular through hole 13 is arranged at the right side wall, and a sliding through hole is arranged at the top; one end of the screw rod 3 is mounted on the threaded hole, the supporting ball 2 is connected to the other end of the screw rod 3, and the measuring hole 12 is located at the middle position of the four supporting balls 2; the spring 4 and the mounting frame 7 are located inside the shell 1, the spring 4 is connected to the bottom of the mounting bottom plate 11 and the mounting frame 7 at both ends respectively; the bottom end of the pressing rod 5 is connected to the top of the mounting frame 7 through the sliding through hole, and the universal ball 6 is connected to the top end of the pressing rod 5; the laser displacement sensor is mounted inside the mounting frame 7, and the laser displacement sensor is located directly above the measuring hole 12.

[0026] The four threaded holes are located on the same plane, and the four supporting balls 2 are located on the same plane. The centers of the four supporting balls 2 are located at the four vertex positions of the rectangle, and the laser head of the laser displacement sensor is located directly above the intersection point of the diagonal lines of the rectangle.

[0027] The sliding through hole is provided with a positioning sleeve at the top, and the pressing rod 5 is arranged in the positioning sleeve. The inner diameters of the positioning sleeve and the sliding through hole are the same, and the outer diameter of the pressing rod 5 is the same as the inner diameter of the positioning sleeve.

[0028] The signal line 8 of the laser displacement sensor is led out from the rectangular through hole 13.

[0029] The right side of the mounting frame 7 is located at the rectangular through hole 13, so that the longitudinal movement of the mounting frame 7 will not be disturbed.

[0030] In order to further limit the movement direction of the mounting frame 7, a limiting through hole is arranged at the bottom of the mounting frame 7, a limiting rod 14 is arranged on the mounting bottom plate 11, and the limiting rod 14 is arranged in the limiting through hole.

[0031] As Figure 2 shown, it is the measuring principle view of the large-diameter seamless pipe inner diameter measuring device in the utility model.

[0032] When measuring the inner diameter of the large-diameter seamless pipe, the measuring device is put into the seamless pipe as a whole, the universal ball 6 is pressed downward to the mounting frame 7, the mounting frame 7 is pressed downward to the spring, so that the four supporting balls 2 and the universal ball 6 contact the inner wall of the seamless pipe at the same time, the four supporting balls 2 and the universal ball 6 are abutted on the inner wall of the seamless pipe and slide; the laser displacement sensor emits laser light to measure the distance from the laser head to the inner wall of the seamless pipe, the thickness of the mounting bottom plate 11 and the distance from the laser head to the mounting bottom plate 11, that is, the inner diameter of the seamless pipe can be obtained.

[0033] The measuring point of the laser light of the laser displacement sensor is located at the center of the ball center distance of the two supporting balls 2, so that the ball center distance and the radius of the seamless pipe form a right triangle, and the radius value of the inner wall of the seamless pipe is calculated through the side length of the triangle.

[0034] In the figure, R represents the radius of the seamless pipe, r represents the radius of the supporting ball 2, b represents 1 / 2 of the distance between the centers of the two supporting balls 2, and a represents the measurement value of the laser displacement sensor.

[0035] (R-r) 2 =b 2 +(R-a) 2

[0036]

[0037] The distance between the plane where the center of the supporting ball 2 is located and the top surface of the mounting bottom plate 11 is fixed and is limited when the measuring device is prepared, the distance from the laser head to the mounting bottom plate 11 can be measured by the laser displacement sensor, or a mark or a protrusion can be made on the measuring hole 12 to indicate the plane where the center of the supporting ball 2 is located, the distance L1 from the laser head to the plane where the center of the supporting ball 2 is located is measured by the laser displacement sensor, and the distance L2 from the laser head to the inner wall of the seamless pipe is measured, L2-L1=a. Therefore, the radius of the seamless pipe can be directly measured by the laser displacement sensor.

[0038] The terms used in the utility model are illustrative and non-limiting terms. Since the utility model can be embodied in various forms without departing from the spirit or essence of the technical scheme, it should be understood that the above examples are not limited to any of the above details, but should be interpreted broadly within the spirit and scope defined by the appended claims, and therefore all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A large bore seamless pipe inside diameter measuring device characterized by, Include: The shell, support ball, screw rod, spring, pressure bar, universal ball, mounting frame, laser displacement sensor; The bottom of the shell is provided with a mounting bottom plate, two threaded holes are arranged on the left and right sides of the mounting bottom plate respectively, a measuring hole is arranged at the bottom, a rectangular through hole is arranged on the right side wall, and a sliding through hole is arranged at the top; One end of the screw rod is installed on the threaded hole, the support ball is connected to the other end of the screw rod, and the measuring hole is located at the middle position of the four support balls; The spring and the mounting frame are located inside the shell, and the right side of the mounting frame is located at the rectangular through hole; The both ends of the spring are connected to the mounting bottom plate and the bottom of the mounting frame respectively; The bottom end of the pressure bar is connected to the top of the mounting frame through the sliding through hole, and the universal ball is connected to the top end of the pressure bar; The laser displacement sensor is installed inside the mounting frame, and the laser displacement sensor is located directly above the measuring hole.

2. The apparatus for measuring the inner diameter of a large diameter seamless tube according to claim 1, wherein The four threaded holes are located on the same plane, and the four support balls are located on the same plane.

3. The apparatus for measuring the inner diameter of a large diameter seamless tube according to claim 1, wherein The centers of the four support balls are located at the four vertex positions of the rectangle, and the laser head of the laser displacement sensor is located directly above the intersection of the diagonal lines of the rectangle.

4. The apparatus of claim 1, wherein, The top of the sliding through hole is provided with a positioning sleeve, and the pressure bar is arranged in the positioning sleeve.

5. The apparatus of claim 4, wherein, The inner diameter of the positioning sleeve and the sliding through hole is the same, and the outer diameter of the pressure bar is the same as the inner diameter of the positioning sleeve.

6. The apparatus of claim 1, wherein, The signal line of the laser displacement sensor is led out from the rectangular through hole.

7. The apparatus of claim 1, wherein, The bottom of the mounting frame is provided with a limiting through hole, and the mounting bottom plate is provided with a limiting rod, and the limiting rod is arranged in the limiting through hole.

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