JPH1094971A - Pressure drive wrench for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the load of piping work by installing a stopper spanner to be engaged with a periphery of a prepared piping material, relative to a movable spanner for transmitting the torque to the circumference of a core, at an interval in the axial direction, and connecting a point of a piston rod of a driving cylinder with the movable spanner, to rotate the same around the core. SOLUTION: A socket 4a of a movable spanner 4 is manually hung on a periphery of a connecting nut, and a stopper spanner 3 is raised, so that a head 3a is hung on a periphery of a tool hanger 11b of a nipple 11. An arm 7a of a rock nut 7 is manually pushed and pulled to be collided with a rear face of a base 1, to be fastented, thereby the location and position of a holder is restricted, and a driving cylinder 5 is fixed to the base 1, after the both spanners have been set. Then a piston is pushed up by the working hydraulic pressure of a main body 5a, an arm 4c of the movable spanner 4 is rotated in the clockwise direction, and the connecting nut held by the socket 4a is rotated in the clockwise direction. Thereby the thread fastening between the nipple 11 and the male screw 11a can be easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrench for use in the work of various types of equipment piping, and for example, a pressure for piping which enables the fastening and disassembly work of a joint pipe to be performed without burden by using hydraulic pressure. Related to a drive wrench.

[0002]

2. Description of the Related Art Equipment pipes for water supply and sewerage and air conditioning for buildings are constructed by connecting pipes of a predetermined diameter according to the pipe position, the pressure of supply fluid and the like with joints. In the construction of such pipes, for example, when connecting pipes of the same diameter, a pipe thread is machined on the end of each of these pipes on site with a lathe and sockets corresponding to the pipe diameters are installed. It is connected by screwing to the pipe thread.

[0003] In addition, a nipple joint to be connected by cutting a female screw on the inner periphery of the pipe end of the pipe and screwing it into the pipe, or turning the pipe when the pipe is constrained on the building side. Where this is not possible, union joints are commonly used.

Conventionally, pipes using sockets, nipples, and unit joints have been used with pipe wrench. An operator holds the pipe wrench and turns it to tighten or loosen the joint. Most of such piping work is performed on site, and the piping space is narrow and workability is often poor. Therefore, manual work using a pipe wrench is mainly used.

[0005]

However, piping work using a pipe wrench is a considerable labor, and particularly in the case of high pressure fluid piping such as water supply and hot water supply piping and air conditioning steam piping. Since the tightening needs to be sufficient, the burden on the operator is large. In addition, a pipe wrench having a longer handle is used as the outer diameter of the pipe is larger. However, in this case, the pipe wrench itself is also heavier, and the burden is further increased in piping work of a pipe of 3 inches or more.

Further, in addition to such a large work load, the tightening torque of the joint varies depending on the manual operation using a pipe wrench, and the quality of the connection greatly changes depending on the skill of the operator. For this reason, the screws of the joint or the pipe may be cut off due to excessive tightening, or water may be leaked due to excessive loosening, and the rework of the piping work may increase.

The problem to be solved in the present invention is to provide a pressure-driven wrench capable of remarkably reducing the burden of piping work and performing good piping work with a fixed tightening torque.

[0008]

SUMMARY OF THE INVENTION The present invention has a shape which can be extrapolated from a direction substantially perpendicular to the axis of a pipe or joint for piping which is to be tightened or loosened, and is capable of transmitting a rotational force around a core. A movable wrench, a stopper wrench that can be set at a position spaced apart in the axial direction with respect to the movable wrench, and whose tip side is forked and can be engaged with the outer periphery of the existing piping material, and a piston rod. A drive cylinder connected to the movable wrench at its tip and rotated around the center thereof is provided on the main body base, and can be moved between the drive cylinder and the main body base substantially concentrically with the movable wrench core and manually operated. It is characterized in that it is connected so as to be restrained by a locking means of the type.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A movable wrench can be provided with a socket having, for example, an arc-shaped cross section which can be extrapolated around a pipe or a joint for piping, and has a serrated engagement tooth formed on the inner periphery of the socket. By doing so, rotation can be given not only to nuts and bolts but also to elbows for pipes and joints.

In addition, between the drive cylinder and the main body base, for example, a lock bolt which penetrates a slit which is cut concentrically with the movable wrench is provided in the main body base on the drive cylinder side, and a lock screw which is screwed to the lock bolt is provided. By rotating the nut by manual operation, the position and posture of the drive cylinder can be fixed by sandwiching the front and back surfaces of the main body base, and the position and posture of the drive cylinder can be fixed to the main body base by loosening the lock nut. However, it is possible to obtain a configuration in which the movable spanner and the stopper spanner can be set on the outer periphery of the pipe member for rotating the movable spanner and the stopper member, respectively.

As a working fluid for operating the drive cylinder, oil, air, or the like can be used. A hydraulic drive can be used at a site where a large tightening torque is applied. Can be achieved.

[0012]

1 is a front view of a pressure driven wrench according to the present invention, FIG. 2 is a cutaway view of FIG. 1 as viewed in the direction of arrows ABCD, and FIG. 3 is a rear view. In this embodiment, an example in which a hydraulically driven cylinder that supplies and discharges oil as a working fluid is used will be described.

In FIG. 1, a hydraulic pressure driven wrench includes two bases 1 and 2 integrally connected by bolts 2a, a stopper wrench 3 for stopping rotation held on one base 2, and a base 1 , 2 and a hydraulic drive cylinder 5 for rotationally driving the movable wrench 4 are main components thereof.

When the base 1 is in the posture shown in FIG. 1, an arc-shaped holding seat 1a is formed at the upper end thereof, and the base 1 is provided with a flat plate-shaped bracket 1b which is connected to the holding seat 1a and protrudes downward. 1b, a slit 1c concentric with the arc of the holding seat 1a is formed.

The other base 2 also has an arc-shaped and thin holding seat 2b at its upper end, and rotatably sandwiches the outer peripheral surface of the movable wrench 5 between the base 1 and the surface facing the holding seat 1a. An annular liner 2c protrudes from the holding seat 2b toward the base 1 side. And liner 2
A pair of guides 2d for inserting the stopper wrench 3 and slidably guiding the stopper wrench 3 is provided on the lower end side of the surface opposite to c.

The stopper wrench 3 has a bifurcated head 3a at its upper end for hanging around a bolt or a nut, and is arranged along one surface of the base 2 as shown in FIG. Is held in. Then, a rod 3 having a reduced width from the lower end of the stopper wrench 3
b is protruded, and a stopper bolt 3c for retaining is attached to the upper end of the rod 3b so that its head can be engaged with the lower end of the base 2. By providing such a stopper bolt 3c, the movement of the stopper wrench 3 is restricted up to the position shown in FIG. 2, and the head 3a larger than the interval between the pair of guides 2d prevents the stopper wrench 3 from falling downward. .

In the example shown in FIGS. 1 to 3, the movable wrench 4 is used for tightening a pipe joint. As shown in FIG. 4, one end of the movable wrench 4 has a tool-holding socket 4a having an arcuate cross-sectional shape. A wave-shaped engaging tooth 4b is provided on the inner periphery of the lever. An arm 4c protruding in a direction perpendicular to the axis of the socket 4a is provided at an outer peripheral edge of one end of the socket 4a in the axial direction, and a connection hole 4d with the drive cylinder 5 is opened at the tip of the arm 4b. ing.

FIG. 5 is a front view of the movable wrench 4 used to loosen the pipe joint when viewed in the axial direction of the socket 4a. This loosening wrench 4 has a relationship between the tightening movable wrench 4 and the left-right symmetrical shape shown in FIG. 4A, and the arm 4b and the connecting hole 4c are symmetrical left and right, respectively. .

FIG. 6 shows the details of the drive cylinder 5, wherein FIG. 6 (a) is a longitudinal sectional view and FIG. 6 (b) is a plan view.

The drive cylinder 5 is provided with a hanger cap 5b at an upper end of a cylindrical main body 5a, pins 5c on two surfaces of the hanger cap 5b, and a port joint at a lower end for connection to a supply pipe for hydraulic oil. 5d is provided, and a piston 5e is housed inside the main body 5a. The piston 5e is integrally provided with a piston rod 5f that penetrates through the hanger cap 5b and protrudes outward. The piston rod 5f has a bifurcated hook 5g at its distal end for holding the arm 4b of the movable spanner 4. As shown in FIG. 2, the hook 5g has a connecting hole 4c of the arm 4b.
And a pin 5h for connecting the drive cylinder 5 to the movable spanner 4 by inserting the drive cylinder 5 into the movable spanner 4.

Further, a piston 5e is provided inside the main body 5a.
The coil spring 5i which urges the port joint 5d side is incorporated. The spring constant of the coil spring 5i is large enough to hold the piston 5e at a position where the piston 5e abuts on the upper surface of the port joint 5d as shown in FIG. Shall be

The drive cylinder 5 is connected to the base 1 via a holder 6 as shown in FIG. The holder 6 holds the outer peripheral surface of the hanger cap 5b between two half-split members, and can hold the drive cylinder 5 by tightening the members with bolts 6a. Holder 6
A positioning hole 6b for inserting and positioning the pin 5c of the hanger cap 5b is provided on the inner peripheral wall of the hanger cap 5b, and the outer peripheral surface has an outer diameter enough to be inserted into the slit 1c of the base 1 and move freely in the slit 1c. Lock bolt 6c
Stick out. Then, a lock nut 7 for fixing the holder 6 to the base 1 by rotating the lock bolt 6c by manual operation, abutting against the back surface of the base 1 and tightening the same is screwed into the lock bolt 6c. The lock nut 6 has a manual operation arm 7a protruding in a radial direction from a portion screwed with the lock bolt 6c.

When working on site, a supply hose (not shown) from a dedicated hydraulic unit is connected to the port joint 5d of the drive cylinder 5, and the hydraulic unit is operated to supply hydraulic oil. Supply and discharge operations shall be performed. As such a hydraulic unit, any hydraulic unit that includes a hydraulic pump operated by a hydraulic motor and has a hydraulic circuit capable of supplying and discharging hydraulic oil to and from the port joint 5d may be used, and a conventionally known simple unit can be used.

In the above configuration, as shown in FIG.
Male screw 1 of nipple 11 already tightened in the pipe
The operation of connecting the joint nut 12 of the connection pipe to 1a is performed in the following manner. It is of course possible to use the hydraulic drive wrench of the present invention from the beginning to the end of the pipe tightening.
May be fastened to the nipple 11 to some extent, and used only when the final fastening is completed.

The lock nut 7 is loosened so that the lock bolt 6c can move freely in the slit 1c of the base 1, and at the same time, the stopper wrench 3 is connected to the guide 2d by the head 3a as shown by a dashed line in FIG. And lower it to the position where it hits. In this state, after the socket 4a of the movable wrench 4 is manually moved so as to hang on the outer circumference of the joint nut 12, the stopper wrench 3 is raised and the head 3a is hung on the outer circumference of the hexagonal tool hook 11b of the nipple 11.

Such a nipple 11 and a joint nut 1
When the stopper wrench 3 and the movable wrench 4 are set to the position 2, the position of the holder 6 is not restricted by the lock nut 7, so that the drive cylinder 5 can freely change its posture and position, and a pin is attached to its piston rod 5 f. The posture and position of the movable wrench 4 connected via 5h can be similarly changed. By setting the movement and the position of the movable wrench 4, the relative position of the stopper wrench 3 with respect to the movable wrench 4 can be freely changed. Therefore, the setting to the nipple 11 and the joint nut 12 can be easily performed manually. Can be.

After setting the nipple 11 and the joint nut 12, the arm 7 a of the lock nut 7 is pushed and pulled by hand, and abuts against the back surface of the base 1 to tighten it. The cylinder 5 is fixed to the base 1. The fixing position of the holder 6 is arbitrary, and FIG.
Although the lock bolt 6c penetrates the right end side of the slit 1c in the structure shown in FIG. 1, the lock bolt 6c may be located at the center or the left end of the slit 1c.

After the drive cylinder 5 is fixed in this manner, when hydraulic oil is supplied from the hydraulic unit into the main body 5a, the hydraulic pressure pushes the piston 5e upward in FIG. 5f advances. Therefore, in FIG. 1, the arm 4c of the movable wrench 4 rotates clockwise, and the joint nut 12 held in the socket 4a is integrated with the movable wrench 4 by engagement with the engagement teeth 4b to rotate clockwise. , Whereby the nipple 11 is screwed and fastened with the male screw 11a.

As described above, the joint nut 1
In the work procedure of using a hydraulic drive wrench when finally tightening the temporarily tightened part 2 in the final tightening, a predetermined tightening torque should be obtained by one supply of hydraulic oil. If this is the case, the working time can be reduced.

The supply of hydraulic oil causes the piston rod 5f
After reaching the stroke end, the supply of the hydraulic oil from the hydraulic unit is stopped and the operating pressure is released. With this release, the piston 5e is pushed by the restoring force of the coil spring 5i, and the initial state shown in FIG. Then, if the tightening of the joint nut 12 is sufficient, the operation is completed. If the tightening torque is not sufficient, the operating oil is supplied again and the tightening of the joint nut 12 by the movable wrench 4 is repeated.

In the above tightening operation, the joint nut 1
The tightening torque of No. 2 can be arbitrarily adjusted on the hydraulic unit side for supplying the hydraulic oil. That is, when the piston rod 5f is advanced, the tightening torque becomes a reaction force and is received by the piston 5e, and the load from the piston 5e is also transmitted to the hydraulic oil from the hydraulic unit. Therefore, by detecting this load on the hydraulic unit side and supplying hydraulic oil from the hydraulic unit until the predetermined torque is obtained, the movable spanner 4 is driven to rotate, so that the joint nut 12 is always nipple with a constant set torque. 11 can be connected.

To loosen the tightened joint nut 12, the movable spanner 4 having the shape shown in FIG. 5 is replaced. That is, the movable wrench 4 is connected to the arm 4c in FIG.
Is held by the bases 1 and 2 in a downward-sloping position, and the main body 5a of the drive cylinder 5 is arranged so that the lock bolt 6c passes through the left end side of the slit 1c in a left-downward position. Thus, if the operating oil is supplied to the main body 5a, the replaced movable wrench 4 can be turned in the counterclockwise direction in FIG. 1, and the fastened joint nut 12 can be loosened from the nipple 11.

In the embodiment, the fastening of the nipple 11 and the joint nut 12 has been described. However, the inner walls of the head 3a of the stopper wrench 3 and the socket 4a of the movable head 4 are formed in a serrated shape like a normal pipe wrench. By doing so, tightening and loosening operations can be similarly performed on various joints such as pipes for pipes and elbows.

[0034]

According to the present invention, the connection and disconnection of various pipes for pipes and their joints can be performed by using pressure drive by hydraulic pressure or the like, so that the present invention can be compared with conventional pipe work using a pipe wrench. The work load is remarkably reduced, and the efficiency of the piping work and the shortening of the construction period can be achieved.

Further, in the tightening of the joints, a tightening torque corresponding to the supply pressure of the hydraulic oil can be uniformly obtained, so that the pipe can be constructed with a constant tightening force regardless of the skill of the operator. .

[Brief description of the drawings]

FIG. 1 is a front view of a pressure driven wrench of the present invention.

FIG. 2 is a partially cutaway view taken along line ABCD of FIG. 1;

FIG. 3 is a rear view of the pressure driven wrench.

4A and 4B show details of a movable wrench for tightening. FIG. 4A is a front view of the socket as viewed in the axial direction, and FIG. 4A is a longitudinal sectional view of a main part.

FIG. 5 is a front view showing an example of a movable wrench for loosening.

FIG. 6 shows the details of the drive cylinder, and FIG.
1 is a longitudinal sectional view, and FIG. 2B is a plan view of FIG.

[Explanation of symbols]

 1: base 1a: holding seat 1b: bracket 1c: slit 2: base 2b: holding seat 2d: guide 3: stopper wrench 3a: head 3c: stopper bolt 4: movable wrench 4a: socket 4b: engaging tooth 4c: arm 4d : Connecting hole 5: Drive cylinder 5a: Main body 5b: Hanger cap 5c: Pin 5d: Port joint 5e: Piston 5f: Piston rod 5g: Hook 5h: Pin 5i: Coil spring 6: Holder 6c: Lock bolt 7: Lock nut 11 : Nipple 11a: Male thread 11b: Tool hook 12: Joint nut

Claims (1)

[Claims] 1. A movable spanner having a shape that can be extrapolated from a direction substantially perpendicular to the axis of a pipe or joint for tightening or loosening operation and capable of transmitting a rotational force around a core, and a movable spanner. A stopper wrench that can be set at a position spaced apart in the axial direction with respect to the axial direction and has a bifurcated distal end side and can be engaged with the outer periphery of the existing piping material, and the distal end of the piston rod is connected to the movable wrench. A drive cylinder that rotates around the core is provided on the main body base, and can be moved between the drive cylinder and the main body base substantially concentrically with the core of the movable wrench, and can be restrained by manually operated locking means. A pressure driven wrench for piping that is connected.