JPS6023686Y2 - Measuring device for the outer circumference of a tubular body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for measuring the outer circumference of a tubular body such as a steel pipe without stopping its running during an intermediate process of manufacturing.

Regarding a method for automatically measuring the outer circumference of a tubular body without stopping its running during an intermediate process of manufacturing a tubular body, Japanese Patent Application No. 76191/1982 (Japanese Patent Application Laid-Open No. 151570/1989) filed by the applicant Furthermore, a patent application has been filed for a specific implementation device for the above method (Japanese patent application filed in 1983).
77365), but the present invention further improves the above device to reduce the weight of the device and simplify the sequence circuit.

The present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a perspective view of the device of the present invention, and Fig. 2 is a partially enlarged front view of Fig. 1. The frame is made up of a box-shaped body with vertical portions 1a and horizontal portions 1b by stretching plate materials on the outer surface of the frame, and the waist is supported so as to be movable up and down, back and forth, and left and right by the support drive means described below. be done.

That is, in a fixed position that does not interfere with the running of the tubular body 28, as shown by an arrow 25, a vertically movable column 2 is placed on a cross member 3 that protrudes onto the running path of the tubular body 28 from the upper end of the column 2 in the running direction of the tubular body 28 (hereinafter simply referred to as A long rectangular frame body (4) is placed and fixed in a direction perpendicular to the direction of travel (hereinafter simply referred to as the "orthogonal direction"), and on the frame body 4 is a nearly regular square frame body. 5 is mounted so as to be movable in orthogonal directions.

The horizontal portion 1b of the pedestal 1 is placed on this frame 5, and the two slide shafts 8, 8 protruding from the inner wall surface of the vertical portion 1a of the pedestal 1 are inserted into the frame 5 and moved in the traveling direction. The frame 1 is supported as possible.

Reference numeral 6 denotes a screw shaft fixed on the frame body 4 so that the axial direction coincides with the orthogonal direction, and by forward and reverse rotation by operating the bundle 7, the frame body 5 can be moved left and right together with the pedestal 1 as shown by the arrow 26. The pedestal 1 is moved back and forth as shown by arrow 27 by forward and reverse rotation of the screw shaft 9 fixed on the frame body 5 by the operation of the bundle 10 so as to coincide with the running direction.

In the above embodiment, the gantry 1 is moved back and forth and left and right by manual operation of the bundle 7.10, but if necessary, automatic operation by motor drive or the like can be used.

A differential transformer 11 for measuring the distance between the top of the tubular body 28 at the measurement position and the mount 1 is hung down from the lower end of the vertical portion 1a of the mount 1, and this differential transformer 11 emits an analog output. An analog-to-digital converter (not shown) is attached.

A small box-shaped slide shaft support member 12 is installed in the lower part of the vertical portion 1a of the pedestal 1 as shown by the broken line.
The piston rod 14 of the air cylinder 13 fixed on the projecting edge m 1 c that projects laterally from the lower end is connected to the slide shaft support member 12 by passing through a hole 15 bored in the side wall of the vertical portion 1a. The slide shaft support member 12 is configured to move forward and backward in the orthogonal direction while being guided by a support guide 12b provided on the inner wall of the vertical portion 1a by driving the air cylinder 13, and the projecting edge portion 1C has a structure in which the slide shaft support member 12 can move forward and backward while being guided by a support guide 12b provided on the inner wall of the vertical portion 1a. fixing a measuring device 16 for measuring the amount;
The operating bar 17 is connected to the piston rod 14 of the air cylinder.
is connected to.

This measuring device 16 employs various known movement amount measuring means such as a potentiometer or a device that outputs a measured value of the movement amount by generating a number of pulses according to the rotation angle of a rotor brought into contact with the slide surface. Ru.

Two slide shafts 18a and 18b whose axial directions coincide with each other in the running direction are separated at equal heights in the lower part of the vertical portion 1a of the frame 1, and one slide shaft 18a is attached to the slide shaft support member. 12, the other slide shaft 18b is placed directly on the pedestal 1, respectively.

Therefore, the slide shaft 18a can move forward and backward in the orthogonal direction.
The slide shaft 18b is stationary.

Pulleys 22a and 22b on which a belt for binding a tubular body, which will be described later, is hung are attached to the slide shafts 18a and 18b.

As shown in the enlarged horizontal sectional view of FIG. 3, the slide shaft fixing portion is loosely fitted to the slide shafts 18a and 18c fixed on the slide shaft support member 12 or the frame 1 via bearings 23b so as to be slidable in the axial direction. The ring-shaped pulley support members 19a, 19b rotatably support pulleys 22a, 22b via bearings 23a, and the pulley support members 19a, 19b include a pulley 22a, which slides in the running direction together with the pulley support members 19a, 19b. Weights 20a and 20b are provided to return 22b to its normal position.

As can be easily understood from the measurement method in which the tubular body 28 is tied up by the lower loop of the belt 24, which will be described later, the pulley support members 19a and 19b have small parts fixed at both ends to the slide shaft support member 12 or the frame 1. The slide guide shaft 21 is inserted through the pulley support members 19a and 19b.
A pulley 22a is slidably supported on the slide shafts 18a and 18b via bearings 23b1, pulley support members 19a and 19b, and bearings 23a.
22 b moves in the running direction at a speed equal to the moving speed of the tubular body 28 due to the frictional force between the belt 24 and the tubular body 28 while the tubular body 28 is tied up by the lower loop of the belt 24;
When the bondage is released, both pulleys 22a and 22b move to the slide shaft 18.
The tubular body 28 is moved by weights 20a and 20b on a and 18b in a direction opposite to the moving direction of the tubular body 28 and returned to its home position.

Beno leaves 24 for binding the tubular body are hung over both pulleys 22a and 22b so as to form a "figure 8" shape with an intersection located below approximately the midpoint of these pulleys.

The belt 24 consists of a linear body 24a from its upper loop portion to a portion slightly below the crossing portion, and the remainder of the lower loop portion consists of a slightly wide band body 24b.

Two arms 2 are attached from both sides of the bottom surface of the vertical portion 1a of the pedestal 1.
9a and 29b project obliquely outward, and the band 24b of the belt 24 is pulled in the direction of opening the loop by coil springs 30a and 30b attached to the left and right arms 29a and 29b and a coil spring 30c fixed to the floor. There is.

The device for measuring the outer circumference of a tubular body according to the present invention, as described later, determines the outer circumference of the tubular body 28 from the amount of movement of the slide shaft support member 12 when the tubular body 28 is bound by the lower loop of the bevel leaf 24. Therefore, it is necessary to set the lower loop of the belt 24 and the tubular body 28 so that they always maintain a constant positional relationship, that is, a positional relationship in which their centers are aligned.

Therefore, in the present invention, by moving the pedestal 1 up and down and left and right, this positional relationship can be easily and accurately adjusted.

In addition, when measuring a spiral steel pipe, it is necessary to tighten the outer circumferential surface of the part without a weld bead in order to find the correct outer circumference length, but in this invention, by moving the mount 1 back and forth, it is easy to adjust the front and back position during measurement. Can be done accurately.

When the tubular body 28 starts rotating and the front end passes through the lower loop of the belt 24 and the outer circumference measurement part enters the lower loop, the air cylinder 13 is driven and the slide shaft support member 12 is moved by the support guide 12b. In order to move backward while the direction is regulated, as shown in FIG. 2, the upper loop of the belt 24 is expanded and at the same time the lower loop is contracted to tighten the outer circumferential surface of the measuring portion of the tubular body 28.

In this case, the air cylinder 13 is set in advance to stop when its internal air pressure reaches a constant pressure, so the piston rod 14 automatically stops after moving a distance corresponding to the outer circumferential length of the tubular body 28. The amount of movement is measured by measuring means 16.

Since there is a certain relationship between the change in the amount of movement and the change in the outer circumferential length of the tubular body 28, by inputting the measurement value of the amount of movement measured as described above into a calculation display (not shown), the amount of movement of the tubular body 28 is You can know the outer circumference of.

In this case, it is necessary to perform the same operation as above using a standard tubular body whose outer circumference is known in advance, and input that information into the calculation display to perform zero point correction of the outer circumference measuring device. Needless to say.

At this time, if the distance between the lower surface of the tubular body 28 and the pedestal 1 changes, the calculation formula performed based on the measured value of the amount of movement of the slide shaft support member 12 changes; however, in the present invention, the differential transformer 11 Since the separation distance between 28 and the frame 1 is measured and the measurement result is input into the calculation display, this correction can be performed automatically.

When the column 2 or the cross member 3 is firm and there is no risk of bending, the above correction can be made by knowing the vertical position of the column 2, so there is no need to install a differential transformer.

The time required to measure the outer circumference of the tubular body varies depending on the length of the belt and the magnitude of the air cylinder pressure, but it usually takes a little less than 1 second to 2 seconds, during which time the tubular body 28 continues to rotate and travel in the axial direction. In the present invention, the belt 24 starts binding the tubular body 28 at the same time as the air cylinder 13 starts to be driven, and after binding, the pulleys 22a and 22b move in the running direction of the tubular body due to the frictional force between the belt 24 and the tubular body 28 until the binding is released. Since the belt 24 moves in the same direction at a constant speed, there is no risk that the binding position of the belt 24 will shift.

Further, even if the belt 24 is pulled to some extent by the rotation of the tubular body 28 in the circumferential direction, it is absorbed by the expanding operation of the upper loop and the shifting of the pulleys 22a, 22b, and the belt 24 is prevented from being cut.

During this period, the belt 24 has a width of 30 to 60 mm in the running direction.
771771, the coil springs 30a, 3Db, and 30c pulling the belt 24 are stretched within their respective elastic limits, and when the measurement is completed, the air cylinder 13 is reversely driven and the belt 24 is The binding of the coil spring 30a9 is loosened and both pulleys 22a, 22b begin to move in opposite directions due to the weight 20.
The belt 24 also returns to its original position due to the elastic restoring force of the 5obs 30c.

The outer circumferential length of the tubular body 28 must be measured at several locations in the axial direction.
The release of the bondage and return to the original position are repeated several times, and this repeated operation is controlled by an appropriate timer device.

FIG. 4 shows a comparison between the results of measuring the outer circumference of a tubular body with a target outer circumference of 4241 mm using the device of the present invention and the results of actually measuring the same measurement site using a tape measure.

The running speed of the tubular body was 1,477 liters per powder, and measurements using the device of the present invention were carried out once every 1 minute and 3 plows.

The measurement results using the device of the present invention are shown as "solid lines", and the actual measurement results using a tape measure are shown as "dots".

As is clear from the chart in FIG. 4, it can be seen that the measured values by the measuring device of the present invention are very close to the actual measured values.

Since the present invention has the above-described structure and operation, it is possible to easily and accurately measure the outer circumference of a tubular body such as a spiral steel pipe, and it has the effects of reducing the weight of the device and simplifying the sequence circuit.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a device for measuring the outer circumference of a tubular body according to the present invention, FIG. 2 is an enlarged plan sectional view of the slide shaft fixed portion, and FIG.
The figure is a partial front view of the device according to the present invention, and FIG. 4 is a chart showing the measurement results by the measuring device of the present invention in comparison with the actual measurement results by a tape measure. In the figure, 1: pedestal, 2: strut constituting the support and drive means of the pedestal, 3: horizontal member, 4, 5: frame, 6°9: screw shaft, 7.10: handle, 8: Same slide shaft, 11
:Differential transformer that measures the separation distance between the frame and the tubular body, 1
2. Slide shaft support member; 13. Drive means for the slide shaft support member (air cylinder in the illustrated example); 16: Measuring means for measuring the amount of movement of the slide shaft support member; 18a, 18b; 2. Slide shaft; 19a, 19b: Pulley support member. , 20: Weight, 22a, 22b: Pulley, 23a? 23
b: Bearing, 24: Tubular body bondage belt, 28
: Tubular body.

Claims (1)

[Scope of utility model registration request] It is equipped with a binding mechanism for the tubular body 28, a movement mechanism for the binding mechanism, and a circumferential length measurement mechanism for the tubular body 28, and these mechanisms are incorporated into a pedestal 1, and the pedestal 1 is located above the running path of the tubular body 28. The binding mechanism of the tubular body 28 is supported by a binding belt so as to be able to substantially surround the outer periphery of the traveling tubular body 28. 24 is arranged, and coil springs 30a, 3 are biased to spread the vicinity of both ends of the bondage belt 24.
Two arms 29a and 29b supporting the gantry 1 through the holder 1 are protruded from both sides diagonally downward of the pedestal 1, and a linear body 24a is endlessly connected to both ends of the binding belt 24.
4a is suspended from two pulleys 22a and 22b arranged on the frame 1 above both ends of the bondage belt 24 so that the linear body 24a and the bondage belt 24 form an eight-letter loop; The mechanism is bearing 23 at
23 b, and a fixed slide shaft 18 b that supports the two pulleys 22 at 22 b in a freely rotatable manner through pulley support members 19 a and 19 b that cannot rotate around the shaft but can slide in the longitudinal direction of the shaft. Slide axis IB
a are arranged in parallel along the traveling direction of the tubular body 28, and pulley support members 19a and 19b are fitted onto both slide shafts 18a and 18b, and when the binding belt 24 is used to bind the tubular body 28, Ways 20a, 20 that move at a constant speed and pull the pulley support member 20 in a direction opposite to the running direction of the tubular body 28 when not bound.
b is provided, and the circumferential length measuring mechanism of the tubular body 28 is such that the piston rod 14 of the cylinder 13 is connected to the support member 12 that supports the movable slide shaft 18a, and the piston rod 14 of the cylinder 13 is driven by the support member 12. The tubular body 2
The binding belt 24 is moved forward and backward in a direction perpendicular to the running direction of the cylinder 13 to bind and release the tubular body 28 .
A device for measuring the outer circumferential length of a tubular body 28, characterized in that a signal means is attached for outputting a signal corresponding to the circumferential length of the tubular body 28 based on the amount of movement of the piston rod 14 when the piston rod 14 is tightened.