JPS581723B2 - Pipe drift inspection machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drift inspection machine for inspecting whether the inner diameter of a pipe to be inspected is a constant diameter, true circle, and straight.

As a means of inspecting the accuracy of the inner diameter of a pipe, there is a method in which a perfectly circular and straight drift rod (inspection rod) of a constant diameter is inserted into the pipe, and if the drift rod gets caught, the product is determined to be defective.

Conventionally, such inspections were performed by a worker manually inserting a drift rod into the pipe.

For this reason, it is inefficient as it requires the man-hours of many dogs, and furthermore, the work is done manually and is extremely dangerous.

The present invention was made to eliminate the drawbacks of artificial drift testing, and its purpose is to make the drift rod inserted into the pipe adjustable up and down, and to provide forward and backward movement with a cylinder. Therefore, it is an object of the present invention to provide an inspection machine that can mechanize drift inspection and improve inspection efficiency and save labor.

Next, the details of an embodiment of the present invention will be described below based on the accompanying drawings showing one embodiment of the present invention.

In the figure, reference numeral 1 denotes a pedestal mounted on a base 2 via a height adjustment mechanism 3 so as to be vertically movable in a horizontal state, and is configured in the shape of a horizontally long frame.

The height adjustment mechanism 3 is provided with a slope 4 at both ends of the base 2, the upper surface of which is a reverse slope with an outward downward slope, and a slide piece 5 is provided on the top surface of both slopes 4 so as to freely slide along the slope. Place it so that

Guides 6 are provided on the lower surfaces of both ends of the pedestal 1, with the upper ends of the slide pieces 5 slidingly fitting in the longitudinal direction of the pedestal 1,
a screw shaft 7 that is rotatable in the longitudinal direction at the center of the lower surface of the pedestal 1;
Guide rods 8 are attached to both sides of the screw shaft 7.

The guide rod 8 passes through the slide pieces 5 on both sides so as to be able to slide freely, and maintains accurate movement of the slide pieces 5.

In addition, both ends of the screw shaft 7 are reverse threaded over the required length, and the portion of each slide piece 5 through which the screw shaft 7 passes,
A nut 9 that is externally screwed onto the screw shaft 7 is fixed.

Further, the vertical height of the pedestal 1, whose both ends are supported by the slide pieces 5, changes in a horizontal state as the slide pieces 5 approach and move away from each other due to the rotation of the screw shaft 7.

In this case, in order to accurately move up and down without changing the front-back position of the pedestal 1, vertical guides 10 are installed vertically near both ends of the base 2, and guides 10 are installed at the bottom of both ends of the pedestal 1. Guide roll 1 that rolls up and down within 10
Install 1.

Furthermore, a worm wheel 12 is fixed in the middle of the screw shaft 7, and a worm 13 that engages with the foil 12 is fixed to the lower surface of the pedestal 1, and the shaft to which the worm 13 is fixed is mounted on the right end of the pedestal 1. The handle 14 is interlocked with the installed handle 14 (see Fig. 3) through a sprocket and a chain.
The screw shaft 7 is rotated by the rotation of , so that the vertical height of the pedestal 1 can be adjusted.

A support mechanism 16 for a drift rod 15 is provided on the upper surface of the right end of the frame 1 in FIG.

This support mechanism 16 holds the drift rod 15 horizontally at a fixed height position so that it can move forward and backward.A vertically long frame 17 is assembled on the pedestal 1, through which the drift rod 15 can pass through the center. Vertical guides 18 are installed at vertical positions sandwiching the draft rod 15 inside the frame 17 so as to be parallel in the front and rear.

Roll holders 19 that are movable up and down with both ends supported by guides 18 are provided at the upper and lower positions sandwiching the drift rod 15, and both roll holders 19 have the drift rod 15 movable in the axial direction at both ends thereof. A guide roller 20 is rotatably mounted to horizontally support the vehicle.

Sprockets 21 are attached to the front and back positions on both sides of the frame 17 using shaft bearings, and a chain 22 is attached to each sprocket 21.
One end of the chain 22 is fixed to the upper roll holder 19 and the other end to the lower roll holder 19, and the upper and lower roll holders 19 are moved up and down relative to a constant horizontal axis. Connect like this.

Further, a cylinder 23 is fixed to the upper center of the frame 17, and the tip of a downwardly directed piston rod 24 is fixed to the upper roll holder 19, and the roll holder 19 is moved up and down by the expansion and contraction operation of the cylinder 23.

A bullet 25 is installed between the lower roll holder 19 and the pedestal 1 to constantly pull down the lower roll holder 19.

Also, a cylinder 2 is attached to the upper surface of the left end of the pedestal 1 in FIG.
The piston rod 28 of this cylinder 26 is mounted so that it can freely swing up and down about the mounting part by the pin 27 as a fulcrum.
A joint shaft 30 is connected to the tip via a bullet 29, a universal joint 31 is incorporated in the middle of the vertical shaft 30, and the tip is coaxially connected to the rear end of the drift rod 15.

A guide roller 32 is attached to the tip of the piston rod 28, and a guide rail 3 on which the guide roller 32 rolls so that the tip of the piston rod 28 moves horizontally accurately is installed on the pedestal 1.
3 is laid horizontally, a limit switch is installed at the rear end of the guide rail 33 to detect the backward limit of the guide roller 32, and a limit switch is installed at the front end of the guide rail 33 to detect the forward limit of the guide roller 32. The forward and backward strokes of the cylinder 26 are controlled to be constant.

In addition, at the connecting portion between the piston rod 28 and the vertical shaft 30,
When the ammunition 29 is compressed and the vertical shaft 30 moves backward, the joint shaft 30
A detection mechanism 34 having a switch structure is provided, which is activated when pressed and outputs a defect signal to stop the inspection.

In addition, numeral 35 in the figure is a stopper for positioning the pipe A to be inspected, and the pipe A to be inspected is sent over a drive roller provided outside the machine in order to make the pipe A to be inspected face directly to the end of the drift rod 15. It comes into contact with this stopper 35 and stops, and is fixed at the stopped position by appropriate means.
The stopper 35 rises after the pipe stops, and the drift rod 15
depart so as not to impede the approach of

The present invention has the above-described structure, and in order to perform a drift test on the inner diameter of the pipe, the pipe A to be tested is stopped and fixed at a fixed position by the stopper 35, and the handle 14 is rotated to adjust the height. Activate the mechanism 3 to adjust the height of the pedestal 1 according to the diameter of the pipe A, and the cylinder 26
Align it with the axis of pipe A.

Before that, the cylinder 23 is extended and the drift rod 15 is held horizontally by the upper and lower guide rollers 20, and at the same time, the center alignment with the pipe A is performed.

With the stopper 35 raised, the cylinder 26 is extended, and the drift rod 15 held horizontally by the guide rollers 20 is advanced and inserted into the pipe A to be inspected.

When the drift rod 15 smoothly enters the pipe A to be inspected and reaches the forward limit position, the guide roller 32 contacts the limit switch, the cylinder 26 is contracted, and the drift rod 1
5 comes out of pipe A and returns to the retracted position.

If there is an error or bend in the inner diameter of the pipe A, resistance such as getting caught on the drift rod 15 entering the pipe A will occur.

When the drift rod 15 stops advancing, the bullet 29 is compressed and the rear end of the joint shaft 30 comes into contact with the detection mechanism 34.
Reference numeral 4 outputs a failure signal and causes the cylinder 26 to contract and move the drift rod 15 backward.

As described above, the present invention includes a drift rod support mechanism that supports a drift rod so that it can move in the axial direction in a horizontal state on a pedestal whose vertical height can be freely adjusted by a height adjustment mechanism, and a drift rod support mechanism that supports the drift rod so that it can move in the axial direction in a horizontal state. The piston rod of the cylinder and the drift rod are connected via a bullet and a universal joint, and a detection mechanism is installed in this connection to detect the backward movement of the drift rod, so that no drift with respect to the inner diameter of the pipe can be detected. Inspection can be mechanized, improving work efficiency and saving labor at the same time.

[Brief explanation of drawings]

The drawings show an embodiment of the drift inspection machine according to the present invention, in which Fig. 1 is a longitudinal sectional front view showing the overall structure, Fig. 2 is an enlarged longitudinal sectional view of the main parts of the same, and Fig. 3 is a longitudinal sectional side view of the same. It is a diagram. 1 is a frame, 2 is a base, 3 is a height adjustment mechanism, 4 is a tilting table, 5 is a slide piece, 6 is a guide, 7 is a screw shaft, 8 is a guide bar, 9 is a nut, 10 is a guide, 11 is a guide roll,
14 is a handle, 15 is a drift bar, 16 is a support mechanism,
1T is a frame, 18 is a guide, 19 is a roll holder,
20 is a guide roller, 21 is a sprocket, 22 is a chain, 23 is a cylinder, 25 is a bullet, 26 is a cylinder, 2
9 is a collapsible bomb, 30 is a joint shaft, 31 is a universal joint, 32 is a guide roller, 33 is a guide rail, 34 is a detection mechanism, 3
5 is a stopper, A is a pipe to be inspected.

Claims (1)

[Claims] 1. A pedestal is mounted on the base via a height adjustment mechanism so that it can be positioned at any desired height position while maintaining a horizontal state, and a drift rod for inspection is installed inside one end of the pedestal. A drift rod support mechanism is provided with a roll holder that holds a pair of upper and lower clamping guide rollers that can move forward and backward in the axial direction horizontally at a predetermined height position on the frame, and that can move up and down relative to each other. The piston rod is mounted and fixed at the other end, and the middle part of the main body is swingably supported so that the tip of the piston rod is guided by a guide rail fixed on the pedestal and can move forward and backward at a predetermined height position parallel to the top surface of the pedestal. The cylinder is mounted and fixed, and the piston rod of the cylinder and the drift rod are connected by a pressure detection mechanism and a joint shaft for transmitting pressure with a universal joint, and the drift rod is directly opposed to the cylinder outside the machine. 1. A drift inspection machine for a pipe, characterized in that it is possible to determine whether or not a good product is present based on the presence or absence of a load detected by the pressure detection mechanism during an inspection in which the pipe is advanced and inserted into a positioned pipe to be inspected.