JPS5810722Y2 - Dendo Torque Wrench Souch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric torque wrench device that has an improved connection structure between a rotating shaft on the rotation drive side and a socket for tightening an object to be tightened.

For example, rails on railways are fixed to sleepers using tightening bolts, and during rail installation work, the tightening bolts are tightened using an electric torque wrench.

Conventionally, when tightening a tightening bolt using an electric torque wrench, a worker rotates the tightening bolt while holding the electric torque wrench by hand, and the tightening bolt is rotated and inserted into the sleeper. The electric torque wrench is lowered accordingly.

(Of course when holding an electric torque wrench by hand,
Even when an electric torque wrench is provided on a cart that can horizontally turn and tilt forward and backward, the electric torque wrench is still held by hand and lowered.

) However, such work requires the operator to hold a heavy electric torque wrench at all times, making the work not only troublesome but also hard work.

Additionally, if the worker is holding an electric torque wrench, it is difficult to tighten the bolts on both sides of the rail at the same time.
Two workers must each hold an electric torque wrench to carry out the work, which has the drawback of extremely poor workability and difficulty in uniformly tightening the torque between the two workers.

The present invention was made in view of the above circumstances, and includes a spline shaft connected to at least the output shaft of an electric torque wrench attached to a movable frame, and a socket having a spline portion attached to the spline shaft so as to be movable in the axial direction. mated,
As a configuration in which this socket is raised and lowered by an operating mechanism,
All you have to do is hold each electric torque wrench in a fixed position and lower only each socket as the object to be tightened moves, making the work easier and ensuring the tightening of the object.
In particular, the present invention provides an electric torque wrench device that can perform uniform and efficient tightening using two or more electric torque wrenches.

An embodiment of the present invention will be described below with reference to drawings.

Figures 1 to 3 show the device of the present invention applied to tightening bolts that fix rails and sleepers to the roadbed.

In the figure, 1 is a movable frame, and this movable frame 1 has a pair of wheels 2,
2' to run on the rail 3, and a pair of supports 5, 5' with carrying handles 4 attached to the front and rear.
A support plate 6 is horizontally attached to the rail 3 by bolts 7, and oval holes are provided in the support plate 6 to correspond to the bolts 7. For example, two electric torque wrenches 8 and 9 are installed on the rail 3. They are vertically attached to the slide plate 10 via locking bolts 32 so as to be located on both sides.

These electric torque wrenches 8 and 9 have the same configuration, so the configuration will be explained using the electric torque wrench 8 as an example, including FIGS. 4 and 5. The electric torque wrench 8 has a reduction gear on the top. A cylindrical case 12 is attached to the lower part of the electric motor 11, and an output shaft 13 of a speed reducer and a cross joint 14 connected to the output shaft 13 are provided inside the case 12. .

The electric motor 11 is of a type that automatically stops when the object to be tightened is tightened with a predetermined torque.

This cross joint 14 has a square hole 15 that is engaged with the output shaft 13.
an upper joint member 15 in which an engagement groove 15b is formed in the upper part and an engagement groove 15b is formed in the lower part along the diameter direction;
An engagement protrusion 16a is formed on the upper part to engage with the engagement protrusion 16a, and an engagement protrusion 16a is formed on the lower part to be perpendicular to the engagement protrusion 16a.
The lower joint member 17 is formed integrally with a spline shaft, which will be described later, and has an engagement groove 17a that engages with the engagement protrusion 16b.

For this reason, the cross joint 14 has engagement grooves 15 b and 17 a.
The engagement of the engagement grooves 15b and 16b provides a rotation transmission function, and since they engage in the vertical direction, a predetermined amount of vertical movement is permitted. Since the stripes 16a and 16b and the engagement groove 17a are arranged along the diameter direction so as to be orthogonal to each other, misalignment with respect to the rotating shaft 13 can be automatically corrected.

Note that the lower part of the lower joint member 17 and the lower part of the case 12 are tapered to enable movement in the diametrical direction when the cross joint 14 performs a self-aligning action.

In addition, the cross joint 14 in each electric torque wrench 8, 9
A spline shaft 18.18 having a predetermined length is integrally formed at the lower part of the lower joint member 17, and this spline shaft 18 has a plurality of spline portions 19 formed thereon, and a lower part of the case 12. It is provided vertically downward through the opening.

Therefore, the rotation of the spline shaft 18 is transmitted by the output shaft 13 via the cross joint 14.

In the figure, reference numeral 20.20 indicates a cylindrical socket, and a spline portion 21 similar to the spline portion 19 is formed on the inner wall of the socket, and a hexagonal shape similar to the bolt head is formed at the lower end. A retaining portion 22 with the object to be fastened is formed.

This socket 20.20 is coupled to the spline shaft 18.18 by interlocking the spline portion 21 with the spline portion 19 of the spline shaft 18.18 connected to each electric torque wrench 8, 9. It is fitted so that it can rotate and move up and down.

A pair of flanges 23 and 23' are formed at the upper part of the outer periphery of the socket 20, spaced apart from each other vertically.

Furthermore, a bearing 24 is provided at the center of the support plate 6 of the movable frame 1.
An operating rod 25 is vertically positioned and movable up and down, and a handle 26 is formed at the upper end of the operating rod 25 so that it can move up and down as well as move forward and backward.

In addition, an electric torque wrench 8,
9 switches 31 are provided, a flange 27 is formed on the upper part of the operating rod 25, and a compression type coil spring 28 is fitted between the flange 27 and the bearing 24. The operating rod 25 is always biased upward.

A fork 2 is provided at the bottom of the operating rod 25 as a support between the sockets t-20 and 20 of the electric torque wrenches 8 and 9.
9 is installed horizontally, and bifurcated engaging portions 30 and 30' are formed at both ends of this fork 29,
Each socket 20.
20 (socket) 20.20 is supported so that it can move up and down.

Therefore, since the operating rod 25 is always biased upward, the fork 29 engages with the collar 23 located above and pulls each socket 20, 20' upward.

In this way, the operating rod 25, coil spring 28, and fork 29 constitute an operating mechanism.

A case will be described in which the electric torque wrench device configured as described above is used to fix the rail 3 to a sleeper with a tightening bolt.

The movable frame 1 is moved on the rail 3 by operating the handle 26, and stopped at a predetermined work position to tighten the socket of the electric torque wrench 8.9) and the tightening bolt (not shown) to be tightened 20. position it above.

Then, when the operating rod 25 is lowered by holding the handle 26 while resisting the spring force of the coil spring 28, the fork 29
also descends in unison.

The descending fork 29 presses the lower flange 23' of the socket 20.20 with its engaging part 30° 30, so that the socket) 20.20 descends along the splined shaft 18.18, and the socket) A retaining portion 22.22 formed at the lower end of 20.20 engages the head of the tightening bolt (or tightening nut).

Next, turn on the switch 31 and turn on the electric torque wrench 8.
, 9, the output shaft 13 is rotated.
．． 13 rotates the spline shaft 18.18 via the cruciform joint 14, and further rotates the socket 20.20 via the spline portion 19.21.

As the socket 20.20 rotates, the tightening bolt is also rotated together.

Then, if the fork 29 is lowered using the operating rod 25,
As the socket 20.20 descends while rotating, the tightening bolt also engages with the socket 20.20 and is inserted into the sleeper while being rotated, and the bolt is tightened with a predetermined torque.
When the nut is tightened, the electric motor 11.11 automatically stops rotating.

Thereafter, by releasing the downward force applied to the handle 26, the operating rod 25 is raised by the coil spring 28, and the fork 29 engages with the upper flange 23 to raise the socket (20.20). 20.
20 is separated from the tightening bolt, and the tightening work is completed.

When performing tightening work in this way, it is sufficient to simply move the sockets 20 and 20 up and down without moving the two electric torque wrenches 8 and 9 up and down while attached to the support plate 6. (socket as the bolt is inserted into the sleeper) 2
0.20 can be lowered appropriately to rotate the tightening bolt.

Further, since the cross joint 14 is provided between the rotary shaft 13 and the spline shaft 18, alignment with respect to the tightening bolt can be easily performed, which is convenient for work.

Furthermore, the pitch of the tightening bolts can be arbitrarily changed by loosening the locking bolts 32, sliding the slide plate 10 on the support plate 6, moving it a predetermined amount, and then tightening the locking bolts 32. In the case of bolts arranged in the form of
The tightening work can be easily performed by rotating the bolt 7 left and right by a predetermined amount and then tightening the bolt 7.

In addition, in the above-mentioned embodiment, the case where the rail is fixed to the sleeper with the tightening bolt was described, but it is not limited to this and can be widely applied to the case of tightening other objects to be fastened. A cruciform joint was used, but this is not always necessary.

As explained above, the electric torque wrench device of the present invention has the following features:
A spline shaft is connected to the rotating shaft of each electric torque wrench mounted on a movable frame, a socket is fitted to each spline shaft, and a support for commonly supporting each socket is connected to the support. An operating mechanism consisting of an operating rod that is movable up and down on a movable frame and pushed up by a spring is provided.

Then, each socket is normally raised via the support by the operation rod, and during tightening work, the operation rod is lowered and each socket is simultaneously lowered via the support to tighten the object to be tightened. can.

For this reason, two or more electric torque wrenches are installed at fixed positions on the movable frame. By lowering each socket in the same state at the same time and tightening them in the same state at the same time, it is possible to tighten the sockets easily, quickly, and evenly. Can perform attachment work.

In other words, each electric torque wrench can be held directly by the operator as in the past, or the load of the electric torque wrench can be directly supported, as in the case where the electric torque wrench is installed on a traveling platform that can rotate horizontally and tilt forward and backward. This can prevent uneven tightening work.

In particular, the operation mechanism includes a support for supporting the sockets and an operation rod for raising and lowering the sockets, and has the function of holding each socket in an upper non-working position and lowering each socket at the same time during operation. It assists the configuration of mounting an electric torque wrench on a movable frame and fitting a socket to each spline shaft, and in combination with these configurations, it facilitates tightening work using at least two electric torque wrenches. It is possible to realize the effect that can be achieved reliably.

Furthermore, since the electric torque wrench tightens the object to a predetermined torque and automatically stops, it is easier and more reliable to operate than a method that mechanically connects and separates the electric torque wrench. Moreover, it is possible to effectively perform the tightening operation simultaneously using the sockets of at least two electric torque wrenches.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, Fig. 4 is a sectional view showing the structure of the spline shaft and socket, and Fig. 5 FIG. 2 is an enlarged exploded perspective view. 1...Moving frame (support body), 8, 9...
・Electric torque wrench, 11...Electric motor, 14.
...Cross joint, 18...Spline shaft,
20...Socket, 25...Operation rod,
29...Fork.

Claims (1)

[Scope of utility model registration request] A movable frame that can travel, at least two electric torque wrenches that are mounted on the movable frame and that automatically stop when the object to be tightened is tightened to a predetermined torque, and one for each output shaft of these electric torque wrenches. A cylindrical socket having a spline portion formed on the inner periphery and fitted in each of the spline shafts so as to be movable in the axial direction; a support for commonly supporting the sockets; An operation that has an operation rod that is connected to a support and is movable up and down on the movable frame and is pushed upward in a spring direction, and that each socket is moved up and down via the support by lowering the operation rod. An electric torque wrench device consisting of a mechanism.