JPH0929650A - Reaction force opposed hydraulic torque wrench - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] There is no need to specially attach a reaction force receiver, and it is not necessary to separately prepare two sets of hydraulic torque wrenches for simultaneously tightening bolts at opposite positions. (EN) Provided is a hydraulic torque wrench capable of sufficiently exerting an effect of receiving a reaction force with a simple device, and further facilitating simultaneous tightening work of bolts at the facing positions as needed. SOLUTION: Two sets of hydraulic torque wrenches 1 and 1a are attached to respective end portions 13 and 14 of one cylinder 12, and the arrangement of each hydraulic torque wrench on the cylinder 12 is two sets of the hydraulic torque wrench 1. , 1a, the respective hydraulic torque wrenches are arranged so as to mutually bear the operating rotational force and the reaction force receiving rotational force that are activated by using the effective length of the cylindrical body 12 as an arm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction force type hydraulic torque wrench.

Generally, a hydraulic torque wrench of this type, which reciprocates a piston by utilizing hydraulic pressure and converts the piston into rotary motion to generate torque, always has some kind of "reaction force reception" regardless of its type. is necessary. The present invention relates to a reaction force type hydraulic torque wrench having two sets of hydraulic torque wrenches so that when one torque wrench operates, the other torque wrench functions as a reaction force receiver.

[0003]

2. Description of the Related Art Conventional hydraulic torque wrenches have various types of "reaction force receiving" configurations. FIG. 4 shows an example thereof. By preventing the body of the hydraulic torque wrench from rotating around the axis H in the direction of arrow C by the reaction force receiver A in the figure, the socket E of the hydraulic torque wrench D is provided. On the other hand, torque in the arrow F direction can be generated. It is possible to tighten bolts and nuts with this torque.

As shown in this figure, when there is no available structure for the reaction force receiver A, unless a reaction force in the direction of arrow G is applied by hitting the lower part of the body of the hydraulic torque wrench D itself somewhere. It is impossible to carry out the work of tightening bolts and nuts.

[0005]

When the reaction force receiving structure is specially provided as in the above-mentioned conventional apparatus, or even if the reaction force receiving structure is not specially provided, the reaction force is directly applied by the body of the hydraulic torque wrench or the like. It is good if the structure can receive
In the case of field work, there is often a case where there is no suitable place for receiving a reaction force, and in such a case, there is a case in which the hydraulic torque wrench cannot be used substantially.

On the other hand, in the case of a wide area such as a flange or a lid of a tank, when tightening with a large number of bolts, etc., as a means for avoiding partial tightening, left and right are alternately arranged in parallel. In some cases, or at the same time, it may be desired to tighten a pair of bolts at opposite positions, and realization of a hydraulic torque wrench capable of performing such work is desired to be solved together with the problem of the reaction force reception. It was in a state.

The present invention has been made in view of the current state of the conventional apparatus described above, and it is not necessary to additionally install a reaction force receiver, and two sets of hydraulic pressures are used for simultaneously tightening the bolts at the opposing positions. It is not necessary to separately prepare a torque wrench, and the effect of receiving the reaction force can be sufficiently achieved by using a simple device, and the simultaneous tightening work of the bolts at the facing positions can be easily performed if necessary. An object of the present invention is to provide a reaction force opposed type hydraulic torque wrench that can be performed.

Another object of the present invention is to realize a reaction force opposed hydraulic torque wrench capable of expanding a range usable as a reaction force receiver through a simple structure and easy operation.

[0009]

As a means for solving the above-mentioned problems, a reaction force opposed type hydraulic torque wrench according to the present invention has two sets of hydraulic torque wrenches at each end of a single cylinder. An integral type hydraulic torque wrench having a torque generating function is formed at two positions on the cylinder by being attached to each other, and each of the two sets of hydraulic torque wrenches is formed by a combination of a cylinder part and a ratchet part. Pressure oil is fed to the piston rod to force the piston rod to reciprocate to relatively rotate the ratchet portion, thereby providing an operating rotational force to the insert of the ratchet portion. The arrangement attached to each end of the cylinder activates two sets of hydraulic torque wrenches so that each hydraulic torque wrench is effective in the cylinder. It is a burden to each other each other with an actuating rotational force to trigger the arms and the reaction force receiving rotational force of.

The two sets of the hydraulic torque wrenches may be attached to the ends of the cylindrical body in a manner that they can be attached and detached by a one-touch operation.

Alternatively, the cylindrical body to which the above-mentioned two sets of hydraulic torque wrenches are attached at both ends may be constructed so that the effective length of the arm can be increased or decreased.

In order to perform tightening work of a large number of bolts arranged in a ring shape, for example, with the reaction force opposed hydraulic torque wrench according to the present invention, one of the two sets of hydraulic torque wrenches is used. , Put it on the bolt to be tightened, and insert the head of the bolt into the socket of the torque wrench. Next, among the many bolts arranged in a ring shape, the other hydraulic torque wrench is the one in the position opposite to the bolt to be tightened, or the other hydraulic torque wrench in terms of distance. Select a bolt in a convenient location and insert the head of the bolt into the socket of the other hydraulic torque wrench. This work is easy if the reaction force opposed hydraulic torque wrench is flexible enough to increase or decrease its effective length due to its structure. For example, the tubular body that integrally connects two sets of hydraulic torque wrenches is a pipe, and the mounting mode is such that the cylinder portions of the respective hydraulic torque wrenches are simply inserted loosely at both ends of the pipe. In such a case, the flexibility regarding the length becomes extremely large, and the operation is extremely easy. Further, when the two sets of hydraulic torque wrenches are of the same type, if two sets of hydraulic torque wrenches are driven by one hydraulic pump,
The two sets of hydraulic torque wrenches can be operated at the same time, and the tightening torques generated by the respective hydraulic torque wrenches are completely equal. This condition serves as a means for avoiding the occurrence of the partial tightening. , Meet the conditions when you want to tighten a pair of bolts at the opposite positions alternately in parallel to each other, or at the same time. Further, in this case, the reaction force receiver required for the hydraulic torque wrench is
Since the wrench of the table is placed in the position where the wrenches are in tension with each other, no special reaction force reception is required, which simplifies the configuration and increases the work efficiency.

According to a second aspect of the present invention, two sets of each hydraulic torque wrench constituting the reaction force opposed hydraulic torque wrench and one cylindrical body can be attached and detached by one-touch operation. For example, if the flexible insertion type is used, the hydraulic torque wrench may be selected or the tubular body may be selected as a connecting body in the preparatory step before the work, or the assembly (and disassembly) as a set of devices may be performed. ) Work becomes easier and easier, which helps to improve work efficiency.

Further, if the structure of the tubular body is such that the effective length of the arm can be increased or decreased, as in claim 3, for example, when a large number of nuts are tightened. As a result, it is possible to flexibly deal with the distance between the tightening nut and the nut selected for receiving the reaction force, thereby improving the work efficiency. It goes without saying that, as one of the simplest examples of the "structure capable of increasing / decreasing the effective length of the arm", for example, the structure according to claim 2 is included.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a reaction force opposed hydraulic torque wrench according to the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows an example of a known hydraulic torque wrench used as a power source for screwing in a bolt or the like. The hydraulic torque wrench 1 is composed of a cylinder portion 2 and a ratchet portion 3. Piston rod 4
Is relatively pushed to the left in the figure by the pressure oil introduced into the pressure oil chamber 5, and the spherical end portion 6 causes the revolving unit 7 to rotate counterclockwise. At this time, the ratchet pawl 8 built in the revolving unit 7 pushes the tooth profile 10 engraved on the peripheral surface of the insert 9 to exert a revolving force in the arrow P direction on the insert 9. However, the turning force in the P arrow direction in this case is
It is a relative turning force generated in the insert 9 when the cylinder portion 2 is fixed in a stationary state by some means. If the insert 9 is fixed non-rotatably and the cylinder portion 2 is in a free state and the pressure oil is introduced, the relative turning force naturally occurs on the cylinder portion 2 side. The whole including the casing of the hydraulic torque wrench 1 will be swung around the axis of the insert 9.
Reference numeral 11 in the figure is a port for the hydraulic oil. Generally, the insert 9 can be exchanged for holes of various sizes. The insert 9 may also be referred to as the output shaft 9.

In FIG. 2, two sets of hydraulic torque wrenches 1 and 1a having the structure shown in FIG. 1 are respectively inserted from the side of the cylinder portion 2 into the respective end portions 13 and 14 of one tubular body 12. By this, an integrated hydraulic torque wrench 1 having a torque generating function at two positions separated from each other on the cylinder body 12
5 is configured. Reference numeral 16 is a push screw for setting the position of the hydraulic torque wrench 1, 1a on the flange K after setting the nuts 17, 17 on the flange K. Reference numerals 18 and 19 denote oil supply pipes for connecting the oil inlet / outlet 11 of the hydraulic torque wrench and the pressure oil pump 20 to supply high pressure oil and discharge low pressure oil.

Next, a description will be given of an operation mode in which the hydraulic torque wrench of the present invention having the above-mentioned structure performs a simultaneous progressive tightening operation for a plurality of nuts, especially a pair of nuts on a diagonal line. In the hydraulic torque wrench 15 of the embodiment shown in FIG. 2, the end portion 1 of the tubular body 12 is
With the push screws 16 of 3, 14 loosened, the inserts 9 of the hydraulic torque wrenches 1, 1a are set to the pair of diagonal nuts 17, 17 to be tightened, and the push screws 16 Tighten 16 to fix the mounting relationship between the cylindrical body 12 and each hydraulic torque wrench. When the pressure oil pump 20 is operated in this state and pressure oil is supplied to the cylinder portion of each hydraulic torque wrench by the oil supply pipes 18 and 19, the pair of nuts 17 and 17 causes an equal amount of torque by the common pressure oil pump. The tightening work is carried out at the same timing. When the work is completed, the hydraulic torque wrench 15 is removed from this state, and the hydraulic torque wrench 15 is set to the next pair of nuts adjacent thereto by the same operation, and the tightening work by the pressure oil pump 20 is performed. To do. In this case, as a general rule, the reaction force receiver required for the tightening work with the hydraulic torque wrench sufficiently fulfills its role by the two hydraulic torque wrenches connected by the tubular body 12 sticking to each other. Therefore, it is not necessary to prepare a special reaction force receiver, and it is possible to simplify the configuration and improve the work accuracy and work efficiency. Further, since the two sets of torque wrenches 1 and 1a provided in the hydraulic torque wrench 15 are driven by the common pressure oil pump 20, the two sets of hydraulic torque wrenches can be operated simultaneously, and the respective hydraulic torque wrenches can be operated. The tightening torque that is generated is completely equal, and this condition is to tighten the pair of bolts at the opposite positions alternately in parallel to each other or at the same time as a means for avoiding the occurrence of the above-mentioned partial tightening. It perfectly matches the conditions of the case.

FIG. 3 shows a different embodiment of a cylinder for mounting two sets of hydraulic torque wrenches. This structure corresponds to the embodiment corresponding to claim 3, and the cylindrical body 21
Is formed in a sheath shape that is slidable by the inner cylinder 22 and the outer cylinder 23. As in the case of the tubular body 12, the push screws 16 for mounting each hydraulic torque wrench are provided at both ends. The push screw 24 is for fixing the relative position after the inner and outer cylinders are arbitrarily slid with respect to each other. With this configuration, the range of increase or decrease in the effective length of the cylinder can be greatly expanded, which is convenient.

[0019]

As is apparent from the above description, the hydraulic torque wrench of the present invention has the following effects.

1) When it is not necessary to additionally install a reaction force receiver required for a hydraulic torque wrench, and it is necessary to equally tighten the bolts at opposite positions simultaneously, 2
It is not necessary to separately prepare a pair of hydraulic torque wrenches, and a simple device can be used to substantially bring out the effect of receiving the reaction force. Moreover, if necessary, simultaneous tightening work of the bolts at the facing positions can be easily and highly accurately performed, and a large number of tightening bolts are regularly arranged along the pitch circle. Especially effective for improving the accuracy of tightening work and improving efficiency.

2) In the hydraulic torque wrench according to claim 2, the assembly or disassembly operation of the two sets of the hydraulic torque wrench can be performed very easily through a simple structure, so that they can be used as mutual reaction force receivers. The range is expanded, contributing to the expansion of the versatility of the device.

3) The hydraulic torque wrench according to claim 3 is useful for greatly expanding the range of possible mounting work when mounting each hydraulic torque wrench on a tightening target and a reaction force receiving target, respectively. , It effectively works for universalization and facilitation of work.

[Brief description of drawings]

FIG. 1 is a sectional view of a hydraulic torque wrench used in a device of the present invention.

FIG. 2 is an explanatory view showing an arrangement mode of an embodiment of the device of the present invention.

FIG. 3 is a cross-sectional view of another embodiment of the cylinder used in the device of the present invention.

FIG. 4 is a perspective view for explaining the principle of operation of a hydraulic torque wrench.

[Explanation of symbols]

 1,1a, 15 Hydraulic torque wrench 2 Cylinder part 3 Ratchet part 4 Piston rod 5 Pressure oil chamber 9 Insert or output shaft 12,21 Cylindrical body 13,14 End part 16,24 Push screw 17 Nut 18,19 Oil pipe 20 Pressure Oil pump 22 Inner cylinder 23 Outer cylinder

Claims (3)

[Claims] 1. An integrated hydraulic torque wrench having a torque generating function at two locations on a tubular body is formed by attaching two sets of hydraulic torque wrenches to respective ends of a tubular body. Each set of hydraulic torque wrenches consists of a combination of a cylinder part and a ratchet part, and by supplying pressure oil to the cylinder part to force the piston rod to reciprocate to rotate the ratchet part relatively. , A configuration in which an operating torque is applied to the insert of the ratchet part, and the arrangement in which each of the hydraulic torque wrenches is attached to each end of the tubular body is such that by operating two sets of hydraulic torque wrenches, It is characterized in that the hydraulic torque wrench is arranged so as to bear the operating rotational force and the reaction force receiving rotational force that are activated by using the effective length of the cylindrical body as an arm. Force opposing hydraulic torque wrench. 2. The reaction force opposed hydraulic torque wrench according to claim 1, wherein the two sets of the hydraulic torque wrenches are attached to the end portions of the tubular body so as to be detachable by a one-touch operation. . 3. The reaction force opposed type hydraulic pressure according to claim 1, wherein the tubular body to which the two sets of hydraulic torque wrenches are attached at both ends is configured to be capable of increasing and decreasing the effective length as an arm. Torque Wrench.