Special automatic measuring device for length of truncated edge of pipe end

Abstract

The invention discloses a pipe end truncated edge length special-purpose automatic measuring device comprising a vertically arranged support, the top of the support is connected with a positioning slide block, one side of the positioning slide block is connected with a sensing measuring head through a telescopic structure, the sensing measuring head is connected with a pre-amplifier, and the pre-amplifier is connected with a pipe end truncated edge. The preamplifier is sequentially connected with the signal amplifier, the A / D converter and the industrial personal computer through data lines; the device can automatically, efficiently and accurately measure the length of the truncated edge of the pipe end of the steel pipe according to related standard requirements, is convenient to operate and high in practicability, and can effectively improve the production efficiency of factory batch inspection.

Description

Technical Field

[0001] The present invention belongs to the technical field of measuring the length of the root face at the pipe end, and relates to a special automatic measuring device for the length of the root face at the pipe end. Background Art

[0002] At present, the measuring tools widely used for measuring the length of the root face at the pipe end of steel pipes are ordinary straight rulers or vernier calipers. When measuring with an ordinary straight ruler, the graduated edge of the straight ruler is closely attached to the root face and direct reading is carried out; however, since the graduation value of the ordinary straight ruler is 1 mm, while the relevant standards require that the measurement of the length of the root face at the pipe end needs to be accurate to 0.1 mm, the measurement accuracy of the ordinary straight ruler is insufficient.

[0003] When measuring with an ordinary vernier caliper, hold the caliper by hand, and place the two jaws of the caliper on the upper and lower edges of the root face respectively, so as to take the reading. However, since the upper edge of the root face at the pipe end is on a slope surface, the jaws of the ordinary vernier caliper cannot accurately be placed on the upper edge of the root face, resulting in the measurement accuracy of the ordinary vernier caliper not meeting the requirements.

[0004] Therefore, no matter whether an ordinary straight ruler or an ordinary vernier caliper is used to measure the length of the root face at the pipe end, the current measurement accuracy cannot meet the requirements. In addition, in ZL200820123083.3, a special measuring tool for the length of the root face at the pipe end of a pure mechanical structure is proposed; this measuring tool has a simple structure, is convenient to operate, and has a wide application range, but the manufacturing process requirements and cost of the measuring tool itself are relatively high.

[0005] Moreover, whether it is an ordinary straight ruler, a vernier caliper or the special measuring tool of the pure mechanical structure proposed in ZL200820123083.3, all of them need to be measured manually one by one, which seriously affects the production efficiency of batch inspection in the factory and is not suitable for batch measurement at the production site. Summary of the Invention

[0006] The purpose of the present invention is to provide a special automatic measuring device for the length of the root face at the pipe end, which solves the problems of insufficient accuracy or low production efficiency of the existing measuring tools.

[0007] The technical solution adopted by the present invention is that a special automatic measuring device for the length of the root face at the pipe end includes a vertically arranged bracket, a positioning slider is connected to the top of the bracket, one side of the positioning slider is connected to a sensing probe through a telescopic structure, the sensing probe is connected to a preamplifier, and the preamplifier is sequentially connected to a signal amplifier, an A / D converter and an industrial control computer through a data line.

[0008] The characteristics of the present invention further lie in:

[0009] Among them, a through hole cooperating with the bracket is formed on the positioning slider. The bracket is movably embedded in the through hole and extends out of the through hole. A semi-threaded hole perpendicular to and communicating with the through hole is formed on the positioning slider. A positioning screw cooperating with it is arranged in the semi-threaded hole, and the positioning screw extends into the semi-threaded hole to connect with the bracket.

[0010] Among them, the telescopic structure includes a telescopic hollow slide rod perpendicular to the top of the bracket. The telescopic hollow slide rod includes a hollow polished rod A and a hollow polished rod B sleeved coaxially. The hollow polished rod B is embedded in the hollow polished rod A. A spring is sleeved around the axial direction of the hollow polished rod A. The sensing probe is connected to one end of the hollow polished rod B away from the hollow polished rod A. One end of the spring is connected to the positioning slider, and the other end of the spring is connected to the sensing probe.

[0011] Among them, the inner diameter of the hollow polished rod A is the same as the outer diameter of the hollow polished rod B.

[0012] Among them, a positioning screw A perpendicular to the hollow polished rod A is arranged on the outside of the hollow polished rod A. The positioning screw A extends into the hollow polished rod A to connect with the hollow polished rod B.

[0013] Among them, one end of the hollow polished rod A away from the hollow polished rod B passes through the positioning slider and is perpendicular to the bracket. A semi-threaded hole perpendicular to the hollow polished rod A is formed on one side of the positioning slider. A positioning screw C cooperating with it is arranged in the semi-threaded hole, and the positioning screw C is connected to the hollow polished rod A.

[0014] Among them, a base is further arranged at the bottom of the bracket.

[0015] The beneficial effects of the present invention are

[0016] The special automatic measuring device for the length of the pipe end blunt edge of the present invention can automatically, efficiently and accurately measure the length of the pipe end blunt edge of the steel pipe according to the requirements of relevant standards, and has the advantages of convenient operation and strong practicability, and can effectively improve the production efficiency of batch inspection in the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the special automatic measuring device for the length of the pipe end blunt edge of the present invention.

[0018] In the figure, 1. sensing probe, 2. spring, 3. telescopic hollow slide rod, 4. data line, 5. positioning slider, 6. positioning screw A, 7. positioning screw B, 8. preamplifier, 9. signal amplifier, 10. A / D converter, 11. industrial control computer, 12. bracket, 13. positioning screw C. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0020] The present invention provides a special automatic measuring device for the length of the pipe end blunt edge, as shown in the following embodiments:

[0021] Example 1. The specific structure of the special automatic measuring device for the length of the blunt edge at the pipe end of the present invention is as follows. As Figure 1 shown:

[0022] The special automatic measuring device for the length of the blunt edge at the pipe end includes a sensing probe 1, a spring 2, a telescopic hollow slide rod 3, a data line 4, a positioning slider 5, positioning screws A 6 and positioning screws B 7, a preamplifier 8, a signal amplifier 9, an A / D converter 10, an industrial control computer 11, a bracket 12 and a positioning screw C 13.

[0023] The sensing probe 1 is a piezoelectric sensor, and its output charge amount is related to the working surface area. To make the measurement accurate, it is required that the width of its working surface does not exceed 0.5 mm; the spring 2 needs to have a certain axial stiffness; the telescopic hollow slide rod 3 is coaxially assembled by two hollow optical rods with different diameters and a certain axial stiffness, namely the hollow optical rod A and the hollow optical rod B; the outer diameter of the small-diameter hollow optical rod B is equal to the inner diameter of the large-diameter hollow optical rod A; the small-diameter hollow optical rod B is assembled in the large-diameter hollow optical rod A, showing a slightly clearance-fitting state; at the same time, a threaded hole perpendicular to the hollow optical rod A is provided on the side of the large-diameter hollow optical rod A close to the hollow optical rod B, and the relative position between the large- and small-diameter hollow rods is adjusted and fixed by loosening and tightening the positioning screw C 13 in this threaded hole; there are two non-interfering through holes perpendicular to each other and two non-interfering semi-through threaded holes parallel to each other on the positioning slider 5; the diameter of one through hole is equal to the rod diameter of the support rod of the bracket 12, and the bracket 12 is movably connected to the positioning slider 5 through this through hole; at the same time, there is a semi-through threaded hole on the positioning slider 5 that is perpendicular and intersecting with the through hole connecting the bracket 12, and the diameter of the semi-through threaded hole is equal to the diameter of the positioning screw A 6, and the positioning of the positioning slider 5 on the bracket 12 is achieved through the positioning screw A 6; the diameter of the other through hole on the positioning slider 5 is equal to the rod diameter of the large-diameter hollow optical rod A of the telescopic hollow slide rod 3, and the hollow optical rod A is also movably connected to the positioning slider 5 through this through hole; at the same time, there is a semi-through threaded hole on the positioning slider 5 that is perpendicular and intersecting with the through hole connecting the hollow optical rod A, and the diameter of the threaded hole is equal to the diameter of the positioning screw B 7, and the positioning screw B 7 is used to fix the position of the hollow optical rod A.

[0024] Example 2. The installation process of the special automatic measuring device for the length of the blunt edge at the pipe end of the present invention is as follows:

[0025] During installation, the sensing probe 1 is installed at the small-diameter end of the telescopic hollow slide rod 3, that is, at the end of the hollow optical rod B; the spring 2 is sleeved outside the telescopic hollow slide rod 3, and both ends of the spring 2 are respectively connected to the positioning slider 5 and the sensing probe 1; one end of the data line 4 is connected to the sensing probe 1, passes through the inner hole of the telescopic hollow slide rod 3, and the other end is connected to the preamplifier 8; the preamplifier 8 is sequentially connected to the signal amplifier 9, the A / D converter 10 and the industrial control computer 11 through the data line; at the same time, the telescopic hollow slide rod 3 is installed on the bracket 12 through the positioning slider 5, the positioning screw A6 and the positioning screw B7, and the height position of the sensing probe 1 can be adjusted according to actual needs.

[0026] During measurement, first adjust the sensing probe 1 to an appropriate height position, and make the spring 2 in a compressed state and perform calibration before measurement; then place the steel pipe to be measured on the rotating stage, and make the sensing probe 1 close to the blunt edge of the pipe end of the steel pipe; at this time, the working surface of the sensing probe 1 is pressed, generating charges and outputting them outward, and the output charge quantity is related to the area of its working surface; and the area of the working surface of the sensing probe 1 is equal to the width of the working surface of the sensing probe 1 itself multiplied by the length of the blunt edge of the pipe end; as the steel pipe rotates, the width of the working surface of the sensing probe 1 itself remains unchanged, but the measured length of the blunt edge keeps changing, resulting in the continuous change of the area of the working surface of the sensing probe 1, and its output charge quantity also keeps changing and is output; through the preamplifier 8, the signal amplifier 9 and the A / D converter 10, the continuously changing electrical signal output by the sensing probe 1 is converted into the value of the blunt edge length measured in real time, and is automatically displayed and recorded on the industrial control computer 11, so as to automatically and efficiently complete the measurement of the blunt edge length of the steel pipe.

[0027] Embodiment 3, the actual application process of the special automatic measuring device for the blunt edge length of the pipe end of the present invention is as follows:

[0028] First, according to the actual size of the steel pipe and the height of the stage, through the mutual adjustment between the positioning slider 5, the positioning screw A6, the positioning screw B7 and the telescopic hollow slide rod 3, adjust the sensing probe 1 to an appropriate height, and require the spring 2 to be in a compressed state so that the working surface of the sensing probe 1 is close to the blunt edge of the pipe end of the steel pipe; at the same time, tighten the positioning screw C13 to lock the relative position between the sensing probe 1 and the positioning slider 5, and keep the compressed state of the spring 2 unchanged.

[0029] Then, calibration and adjustment before measurement are carried out. First, loosen the positioning screw A6, and rotate the positioning slider 5 around the support rod of the support 12 to adjust the sensing probe 1 to one side so that it no longer contacts the pipe end, and then tighten the positioning screw A6. Due to the effect of the positioning screw C13, the relative states among the sensing probe 1, the spring 2, and the positioning slider 5 remain unchanged. Then, use a standard gauge block as the test sample to check the signal transmission state and sensitivity of the system, and calibrate and adjust the system through adjustment. After calibration and adjustment, loosen and tighten the positioning screw A6 and rotate the positioning slider 5 around the support rod of the support 12 to adjust the sensing probe 1 to the position close to the blunt edge of the pipe end to be measured again.

[0030] During the formal measurement, the steel pipe to be measured rotates on the loading platform; the sensing probe 1 is close to the blunt edge of the pipe end of the steel pipe; at this time, the working surface of the sensing probe 1 is pressurized, generating charges and outputting them outward. The output charge quantity is related to the area of its working surface; and the area of the working surface of the sensing probe 1 is equal to the width of the working surface of the sensing probe 1 itself multiplied by the length of the blunt edge of the pipe end. As the steel pipe rotates, the width of the working surface of the sensing probe 1 itself remains unchanged, but the measured length of the blunt edge keeps changing, resulting in the continuous change of the area of the working surface of the sensing probe 1, and its output charge quantity also keeps changing and is output. The continuously changing electrical signal output by the sensing probe 1 is converted into the value of the blunt edge length measured in real time through the preamplifier 8, the signal amplifier 9, and the A / D converter 10, and is automatically displayed and recorded on the industrial control computer 11, thus automatically, efficiently, and accurately completing the measurement of the blunt edge length of the steel pipe in real time.

Claims

1. A special automatic measuring device for the length of the blunt edge at the pipe end, characterized in that, It includes a vertically arranged bracket (12). The top of the bracket (12) is connected to a positioning slider (5). One side of the positioning slider (5) is connected to a sensing probe (1) through a telescopic structure. The sensing probe (1) is connected to a preamplifier (8). The preamplifier (8) is sequentially connected to a signal amplifier (9), an A / D converter (10), and an industrial control computer (11) through a data cable.

2. The special automatic measuring device for the length of the blunt edge at the pipe end according to claim 1, characterized in that, A through hole matching the bracket (12) is formed on the positioning slider (5). The bracket (12) is movably embedded in the through hole and extends out of the through hole. A half-threaded hole perpendicular to and communicating with the through hole is formed on the positioning slider (5). A positioning screw (6) matching the half-threaded hole is arranged in the half-threaded hole. The positioning screw (6) extends into the half-threaded hole to contact the bracket (12).

3. The special automatic measuring device for the length of the blunt edge at the pipe end according to claim 1, characterized in that, The telescopic structure includes a telescopic hollow slide bar (3) perpendicular to the top of the bracket (12). The telescopic hollow slide bar (3) includes a hollow optical rod A and a hollow optical rod B sleeved coaxially. The hollow optical rod B is embedded in the hollow optical rod A. A spring (2) is sleeved around the axial direction of the hollow optical rod A. The sensing probe (1) is connected to one end of the hollow optical rod B away from the hollow optical rod A. One end of the spring (2) is connected to the positioning slider (5), and the other end of the spring (2) is connected to the sensing probe (1).

4. The special automatic measuring device for the length of the blunt edge at the pipe end according to claim 3, characterized in that, The inner diameter of the hollow optical rod A is the same as the outer diameter of the hollow optical rod B.

5. The special automatic measuring device for the length of the blunt edge at the pipe end according to claim 3, characterized in that, A positioning screw A (13) perpendicular to the hollow optical rod A is arranged on the outside of the hollow optical rod A. The positioning screw A (13) extends into the hollow optical rod A to contact the hollow optical rod B.

6. The special automatic measuring device for the length of the blunt edge at the pipe end according to claim 3, characterized in that, One end of the hollow optical rod A away from the hollow optical rod B passes through the positioning slider (5) and is perpendicular to the bracket (12). A half-threaded hole perpendicular to the hollow optical rod A is formed on one side of the positioning slider (5). A positioning screw C (7) matching the half-threaded hole is arranged in the half-threaded hole. The positioning screw C (7) contacts the hollow optical rod A.

7. The special automatic measuring device for the length of the blunt edge at the pipe end according to claim 1, characterized in that, A base is further arranged at the bottom of the bracket (12).

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