JPS62157785A - Pipe connecting tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to an improvement of a pipe connecting tool that inserts a pipe into a joint body and connects the pipe and the joint by tightening or crimping the portion where the pipe and the joint overlap by a certain amount. More specifically, the present invention relates to a pipe connecting tool that performs a crimping operation for tightening after quantitatively confirming the overlap between a pipe and a joint.

[Conventional technology] Conventionally, in the piping method of connecting pipes and fittings by crimping,
As shown in Figure 4a, synthetic rubber O is attached to the end group 1.
Figure 4C shows a pipe 7 with two line marks 6 marked with a line gauge 5 at the required positions on the end 4 to be connected to the joint 3 into which the ring 2 has been inserted as shown in Figure 4C. After confirming that the end face of the fitting 3 has entered between the two line marks 6, that is, that a certain amount of the pipe 7 has been inserted into the fitting 3, make sure that the pipe 7 and the fitting 3 are at a constant position. Place a pipe connection tool (described later) in the overlapping area (not shown), apply force to the tool using hydraulic pressure, and connect the joint 3 and pipe 7 half-manually (as shown in Figure 4 d). The connection is made by crimping.

The configuration of the pipe connecting tool used to connect the joint 3 and the pipe 7 will be explained with reference to FIGS. 5 to 7. In Figure 5, 1
0 is a crimp jaw for tightening, a pair of upper and lower jaws 10a
, 10b is rotatably supported on the holder 11 by a pin 11a. The clamping part 13 of the jaws 10a and 10b is usually closed by a leaf spring 12 (see Fig. 7), and the clamping part 13 is shaped like a hexagon in the closed state, and there is a hexagonal shape in the middle in the width direction. A groove 14 is provided which is cotangential to the inner circumferential surface of the groove.

The tightening crimp 10 having such a structure is removably attached to the tip of a cylinder guide 16 having a sleeve 15 so that it can be replaced depending on the diameter of the pipe joint. That is, as shown in FIGS. 6 and 7, the rear portions of the cylinder guides 10a and 10b are disposed within the slits 15, and the cylinder guides 16
The base of the holder 11 is fitted into the recesses 15a on both left and right sides of the slit 15 at the tip of the holder 11, and is connected to the cylinder kite 16 with a free pin 17, and the free pin 17 is screwed onto the tip surface of the cylinder kite 16. The bales are fixed with hexagon socket head bolts 18.

A cylinder 19 is screwed into the rear part of the cylinder guide 16, and a cylindrical piston 20 is inserted into the cylinder 19 and passes through the distal end surface of the cylinder 19.
A roller bracket 21 is coupled to the tip of the cylinder guide 16 within the cylinder guide 16. A pair of rollers 22 are vertically supported on the roller bracket 21, and as the piston 20 moves forward, the rollers 22 rotate the jaws 10a, 10b to apply a tightening force. A cylinder cap 24 having a pressure oil passage 23 in the center is screwed onto the rear end of the cylinder 19, and a tension spring 25 is inserted between the cap 24 and the inside of the cylindrical piston 20. cap 2
A high pressure nipple 26 is connected to the fluid passage 23 and is screwed into the high pressure nipple 26. combined. A switch mechanism 30 is provided in the upper part of the switch box 2Y. 31 is the push button switch, and 32 is a switch cord connected to the switch mechanism 30. The hydraulic hose 29 is connected to the oil tank 34 of the electric hydraulic pump 33 as shown in FIG. 5, and the switch cord 32 is connected to the power cord 3 connected to the commutator motor 35 of the electric hydraulic pump 33.
It is connected in the middle of 6. 37 is an air valve (fuel filler port),
38 is an earth jack.

In order to tighten and crimp the pipe 7 inserted into the joint 3 as shown in FIG. Open the clamping part 13 by rotating it around the pin 11a to fit the groove 14 on the inner peripheral surface of the clamping part 13 into the group 1 of the joint 3, and then release the grips 10a and 10b to release the restoring force of the leaf spring 12. Close the doors 10a and iob and set them on the joint 3. Next, after plugging the power cord 37 into the power source, it is passed through the push button hose 29 of the switch box 27 to the pressure oil passage block 28 and the high pressure nipple 2 shown in FIG.
6. It is supplied into the cylinder 19 via the pressure oil passage 23 of the cylinder cap 24. As a result, the cylindrical piston 20 in the cylinder 19 moves forward against the tension spring 25, and the pair of upper and lower rollers 22 pivotally supported by the roller bracket 21 connected to the tip of the piston 20 moves forward.
The pair of upper and lower jaws 10a and 10b are brought into contact with the inner rear portions of the upper and lower jaws 10a.

10b rotates around the pin 11a and bites into the outer periphery of the joint 3, and the overlapping part of the joint 3 and the pipe 7 is shown in Fig. 4d.
As shown in the figure, the clamps are crimped and connected.

[Problems to be Solved by the Invention] By the way, in the connection between the joint 3 and the pipe 7, the joint 3
The connection strength of the pipes depends on the area of the overlapping part of the pipe 7, so in the conventional piping method described above, as shown in Figure 4, the end of the pipe 7 to be connected is connected according to the diameter of the pipe 7. However, in actual piping construction on site, in the rush to connect a large number of pipes, it is necessary to stop scribing the line mark 6 and insert the pipe 7 into the joint 3 by sight. Or, even if you take the pains to draw the line mark 6, when inserting the pipe 7 into the joint 3, you may not check the insertion amount of the pipe 7 sufficiently at the in mark 6, or forget to check, and the pipe will be inserted as it is. The joint 3 and the pipe 7 were often connected using a connecting tool.

For this reason, it was not possible to quantitatively ensure the overlapping of the joint 3 and the pipe 7, leading to human connection errors and accidents such as leakage.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems. When connecting pipes to a joint with a pipe connecting tool, the joint and the pipe are It is an object of the present invention to provide a pipe connecting tool that detects whether or not the amount of overlap between the two is appropriate, and performs a tightening and crimping operation only when the appropriate amount is necessary.

[Means for Solving the Problems] The pipe connection tool of the present invention for solving the above problems is a tightening tool in which a pair of jaws for tightening the overlapping portion of a joint and a pipe are rotatably supported on a holder. A cylinder with a piston equipped with a pair of rollers at the tip of the rear end of the cylinder guide is connected to the cylinder, and the cylinder is connected to an electric hydraulic power source by operating a push button switch. In the pipe connection tool, a piston is advanced by supplying pressure oil from a pump, and a clamping force is applied to the pair of jaws via a roller, on a side surface of the clamping crimp jaw. A detector is provided to detect the degree of overlap between the fitting and the pipe by contacting the fitting at the position of the required overlap length between the fitting and the pipe, and the detection signal from the detector determines whether the overlap between the fitting and the pipe is appropriate or not. The present invention is characterized in that a control box is attached to the electric hydraulic pump, which includes a signal processing section for processing the signal processing section, and a relay that opens and closes the power supply circuit of the electric hydraulic pump based on the processed signals of the signal processing section.

[Function] According to the pipe connecting tool configured as described above, when the tightening crimp is attached to the outer periphery of the joint after inserting the pipe into the joint, 1. A detector installed on the side comes into contact with the outer circumference of the joint and detects small deviations between the joint and the pipe, and the detection signal is sent to the signal processing unit and processed to ensure that the amount of pipe inserted into the joint is appropriate. If it is calculated, the relay works in the direction of closing the power circuit, so the electric hydraulic pump is driven by operating the push button switch, and pressurized oil is supplied to the cylinder to tighten the talino,
A tightening force is applied to the Peugeot, and the fitting and pipe are crimped and connected. If the detection signal sent to the signal processing unit is processed and it is calculated that the amount of tube inserted into the joint is inappropriate, the relay will not operate with the power circuit open, and the pushbutton switch will not operate. Since no force is applied, incorrect fittings and pipe connections are automatically prevented.

(Example) An example of the pipe connection tool according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the pipe connecting tool, and the same reference numerals as in FIG. 5 indicate the same parts, so a description thereof will be omitted. 40 is a pair of upper and lower jaws 10a and 10b of the tightening crimp jaw 10
A detector provided on the side surface of a holder 11 which is rotatably supported by a pin 11a, in this example, an eddy current sensor equipped with an eddy current generation mechanism and a mechanism for detecting the intensity of the generated eddy current. The eddy current sensor 40 is adapted to contact the outer periphery of the fitting at a desired overlap length between the fitting and the tube.

That is, as shown in FIG. 2, the eddy current sensor 40 is mounted on a bracket 41 that is attached to the side surface of the holder 11 so as to be adjustable toward the center of the clamping parts 13 of the pair of upper and lower jaws 10a and 10b. 13 and in contact with the outer periphery of the joint into which the tightening part 13 is fitted. A detection cord 42 of the eddy current sensor 40 is connected to a control box 44 through a connector 43 as shown in FIG. This control box 44 is interposed between the power cord 36 of the electric hydraulic pump 33 and the switch cord 32, and is connected to the electric hydraulic pump 33.
4 has a signal processing section 45 connected to the detection cord 42 of the eddy current sensor 40 through a connector 43, as shown in the circuit of FIG. A relay 46 is connected to open and close the power supply circuit of the electric hydraulic pump 33 according to the detected voltage. 47
48 is a power transformer installed in the middle of the circuit to the signal processing unit 45 that bypasses the relay 46, and 48 is a power supply conset connected to the relay 46 and installed on the outside of the control box 44, and the plug 49 of the switch cord 32 is It is designed to be inserted. 31 is a push button switch, and 35 is a commutator motor of the electric hydraulic pump 33. On the outer surface of the control box 44, connected to the signal processing section 45, a power indicator light 50 and a joint-pipe tightening/crimping operation indicator light 51 are provided.

According to the pipe connecting tool of the embodiment configured as above, the fourth
After inserting the pipe 7 into the fitting 3 as shown in Figure C, the fitting 3
A tightening crimp 10 shown in FIG. 2 is attached to the outer periphery of the joint 3, and when the power cord 36 is connected to the power source, the eddy current sensor 40 provided on the side surface of the eddy current sensor 40 comes into contact with the outer periphery of the joint 3.

This eddy current sensor 40 generates an eddy current in the overlapping portion of the joint 3 and the pipe 7, detects the intensity of the eddy current that varies depending on the degree of overlap between the joint 3 and the pipe 7 as a detection voltage, and uses the detected voltage as a third Signal processing unit 45 of control box 44 in the figure
will be sent to. In the signal processing unit 45, the detection voltage Vo when the amount of insertion of the pipe 7 into the joint 3 is appropriate is set in advance, so the sent detection voltage Vn is compared and calculated, and if Vo<Vn, an eddy current is detected. The joint 3 and the pipe 7 overlap at the position of the sensor 40, and the insertion amount of the pipe 7 into the joint 3 is appropriate. This detection voltage Vn is sent to the relay 46, and the contact of the relay 46 is connected to the power supply. This will close the circuit.

Then, not only the power indicator light 50 but also the joint and pipe tightening/crimping operation indicator light 51 are turned on. Therefore, when the push button switch 31 is pressed, a current flows to the commutator motor 35 to rotate it, and the electric hydraulic pump 33 is driven to supply pressurized oil to the cylinder 19, and the signal processing section 45
The detection voltage yn sent from the eddy current center 40 is compared with a preset appropriate detection voltage VO, and y is calculated.
When o > yn, the joint 3 and the pipe 7 do not overlap at the position of the eddy current sensor 40, and the amount of insertion of the pipe 7 into the joint 3 is insufficient, and this detected voltage vn is
6, the contacts of the relay 46 do not operate and the power supply circuit remains open. Although the power indicator light 50 is lit, the joint-to-pipe tightening and crimping operation indicator light 51 is not lit. Therefore, even if the push button switch 31 is pressed, the commutator motor 35 does not rotate and the electric hydraulic pump 33 is not driven, so pressure oil is not supplied to the cylinder 19 and no tightening force is applied to the tightening crimp 10. Improper connections between the fitting 3 and the pipe 7 are automatically prevented.

Note that the detection voltage set in the signal processing section 45 of the control box 44 is changed to an appropriate value depending on the diameter and wall thickness of the joint 3 and the pipe 7, and the diameters of the joint 3 and the pipe 7 change. If so, replace the removable tightening crimp.

In the above embodiment, the eddy current sensor 40 was used as a detector that contacts the joint 3 and detects the degree of overlap between the joint 3 and the pipe 7, or the eddy current sensor 40 is used as a detector that contacts the joint 3 and detects the degree of overlap between the joint 3 and the pipe 7. The device may be a device that measures the amount, a device that transmits X-rays, a device that measures the attenuation amount, or a device that measures the relative position of the joint and the pipe using an optical sensor. The detection signal detected by the detector is also sent to the signal processing section of the control box.

[Effects of the Invention] As can be seen from the above explanation, according to the pipe connection tool of the present invention,
When connecting a fitting and a pipe, the overlap between the fitting and the pipe is detected by a detector installed on the side of the tightening crimp attached to the outer circumference of the fitting, and the detection signal is processed by the signal processing section of the control box. The electric hydraulic pump is activated only when the fitting and pipe overlap by the appropriate amount, applying a tightening force to the tightening crimp and performing the tightening crimping operation. Improper connections between fittings and pipes are automatically and completely prevented, accidents such as leakage do not occur, and the joint strength between the connected fittings and pipes is high and stable.

Furthermore, the pipe connection tool of the present invention can be used as an inspection device for pipes after the connection work has been completed, since the overlap between the joint and the pipe can be confirmed in a fixed manner.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of an embodiment of the pipe connecting tool according to the present invention, Fig. 2 is a side view of a tightening cylinder jaw in the pipe connecting tool, and Fig. 3 is a schematic perspective view of an embodiment of the pipe connecting tool according to the present invention. The circuit diagram of the control box in the control box, Figures 4a to 4d are diagrams showing the process of joining the joint and the pipe, Figure 5 is a schematic perspective view of a conventional pipe connection tool, and Figures 6 and 7 are the pipe connections. FIG. 2 is a partially cross-sectional plan view and a vertical cross-sectional side view showing the main parts of the tool. 3...Joint, 7...Pipe, 10...Crimp jaw for tightening, 10a, 10b...Jaw, 11...Holder,
16...Cylinder kite, 19...Cylinder, 2
0...-piston, 22... roller, 31...
Push button switch, 33...Electric hydraulic pump, 35.
...Commutator morph, 40...Eddy current sensor (detector), 42...Detection code, 44...Control box, 45...Signal processing section, 46...Relay. Figure 1 Figure 5

Claims (1)

[Claims] A clamping crimp jaw consisting of a pair of jaws rotatably supported in a holder for clamping the overlapping part of a fitting and a pipe, or a clamping crimp jaw that is removably attached to the tip of a cylinder guide, and a pair of rollers at the rear end of the cylinder guide. A cylinder having a piston provided at the tip is connected to the cylinder, and by operating a push button switch, pressure oil is supplied from an electric hydraulic pump to the cylinder to advance the piston, and a tightening force is applied to the pair of jaws via a roller. In the pipe connecting tool, a detector is provided on the side surface of the tightening crimp jaw at a position of a required overlap length between the fitting and the pipe, and the detector contacts the fitting to detect the degree of overlap between the fitting and the pipe. a control box equipped with a signal processing unit that processes whether the amount of overlap between the fitting and the pipe is appropriate based on the detection signal of the detector; and a relay that opens and closes the power supply circuit of the electric hydraulic pump based on the processed signal of the signal processing unit; A pipe connection tool that is attached to an electric hydraulic pump.