JPS5839632B2 - Torque set bolt tightening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque set bolt tightening machine.

Generally, in order to tighten two tightening members A and C using a torque set bolt a as shown in Fig. 1, first bolt a
is inserted into two tightening members (e), and a nut (e) is screwed together via a washer (d). After tightening with a spanner or the like, the bolt is increased using a torque set bolt tightening machine.

In this case, when the rotational torque of the nut e reaches a certain specified value, the bolt gripping part f breaks from the breaking groove g, thereby completing the tightening. In this way, the tightening completion torque is set in the bolt itself. Torque set pol)
This is a characteristic of a.

Therefore, using Torque Set Bolt a has the advantage that there is no need to check the torque after tightening, and it is possible to prevent forgetting to tighten by simply visually checking for breakage of the bolt grip part f. It is widely used in bridge construction, etc., replacing high-strength friction welded bolts.

By the way, the above-mentioned fastener for tightening the torque set bolt a has a bolt grip socket that fits into the bolt grip part f, and a nut socket that fits with the nut e, and a differential speed reduction mechanism and drive that drive both sockets. The impact wrench has a disadvantage in that the overall length is much longer than that of the conventional impact wrench used for fastening high-strength friction bonding bolts.

Also, unlike an impact wrench that tightens by impact force, this tightening tool statically rotates the nut to tighten the torque set pole (a).This tightening tool is heavy because the tightening torque is directly applied by a reduction mechanism. It has the disadvantage of becoming.

As a result, if the overall length of the fastener is long, as shown in Figure 2,
It is not possible to insert a torque set bolt tightening machine inside the H-shaped steel, and a special universal joint is required to tighten the torque set bolt in this part.

Alternatively, only the H-shaped steel parts are fastened using conventional high-strength friction welding bolts with an impact wrench.

In addition, recently, large diameter torque set bolts have begun to be used, as seen in hydrosphere bridges, for example, 30% of the nominal diameter
The torque set bolt requires a tightening torque of 200 kgfm or more, and a torque set bolt tightening machine that uses a gear mechanism to statically transmit the above tightening torque is a considerably heavy object. turn into.

Therefore, it is impossible to carry such a large-capacity torque set bolt tightening machine and carry out the tightening work easily, so the torque set bolt tightening machine is temporarily attached to the tip of a balancer that is fixed to the appropriate position of the steel material. After hanging it, the large diameter torque set bolt is tightened.

This invention improves the above-mentioned drawbacks of the torque set bolt tightening machine by dividing the torque set tightening machine into a drive body and a differential reduction gear, and connecting both with a universal joint. The configuration of the present invention will be described below based on an embodiment shown in the drawings.

In Fig. 3, 1 is a motor with a grip handle 2 integrally formed therein, and 3 is a casing attached to the front of the frame of the motor 1, which contains a reducer inside. The rotation of the rotor shaft is decelerated to a predetermined rotation speed.

4 is a chuck mechanism attached to the output shaft end of the reducer;
The driving body A is formed by the above steps.

In addition, a lightweight, high-output commutator motor is generally used for the drive body A, and the rotation speed of this motor at no load is approximately 2 per minute.
When tightening M16 to M22 torque set bolts using a speed reduction mechanism at 0.000 rotations, the rotation speed at the end of the output shaft is reduced to 2.000 to 1.000 rotations per minute.

The opening is a long universal joint with one end held by the chuck mechanism 4 and a spline shaft 5 formed at the other end fitted into a spline groove 7 drilled at the tip of a small bevel gear shaft 6, which will be described later. It is constructed by connecting a large number of small and short universal joints in series in the middle, and unlike general universal joints, which have a single bending point and are limited to a cutting angle of approximately 15 degrees or less. In the case of this universal joint, there are many bending points and it is flexible, and it is possible to transmit power by making the bending angle approximately 90 degrees.

C is a differential speed reduction device, which will be described later, in which the small bevel gear shaft 6 is supported by the gear box 8, and is constructed by the mechanism shown in FIG.

That is, in FIG. 4, I, l, and I are the planetary gear mechanisms of the input stage, intermediate stage, and output stage that constitute the differential reduction gear C, and 8
is the input stage, the planetary gear mechanism I in the intermediate stage;
10 is a conjugate internal gear 9 to prevent deviation from the gear box 8.
12 is a sun gear of the planetary gear mechanism I in the input stage; 13 is a large bevel gear disposed coaxially with the sun gear 12 in the input stage; It is integrally connected to a flange provided on the sun tooth shaft via a bolt 14.

15 and 16 are ball bearings that support the sun gear shaft, 11 is a small bevel gear that meshes with the large bevel gear 13 with their axes perpendicular to each other, and 18 is a ball formed to protrude from the upper outer peripheral surface of the gear box 8. The holding portion 6 of the bearing 19 is the aforementioned small bevel gear shaft that is pivotally supported by the ball bearing 19, and has a spline groove 7 formed at its tip to fit with the aforementioned spline shaft 5 of the universal joint opening.

Reference numeral 20 denotes a grip handle protruding from the outer peripheral surface of the gear box 8 extending from the approximate center to the lower part.

I is the planetary gear mechanism of the input stage described above and has the configuration described below.

That is, 21 is an input stage planetary gear that meshes with the input stage sun gear 12 and the conjugate internal gear 9, and is arranged at, for example, three positions at equal intervals on the pitch circumference of the input stage sun gear 12. I'll keep it.

Reference numeral 22 denotes a planetary gear support frame of the input stage, which is made by cutting out the outer periphery of a cylindrical body that covers the outside of the sun gear 12 of the input stage with an inner hole so that the planetary gear 21 is housed in this part, and 23 is this planetary gear support frame. A support shaft inserted from the side of 22 rotatably supports the planetary gear 21 via a bearing.

The above conjugate internal gear 9, the three planetary gears 21 and the support shaft 23,
The sun gear 12 and the planetary gear support frame 22 constitute an input stage planetary gear mechanism I.

Thereafter, in the same manner, an intermediate stage sun gear 24 is integrally formed in front of the input stage planetary gear support frame 22.
．． Three planetary gears 25, a support shaft 26, and a planetary gear support frame 27
, and the conjugate internal gear 9 constitute an intermediate stage planetary gear mechanism.

Furthermore, in the same manner, an output stage sun gear 28 is integrally formed in front of the intermediate stage planetary gear support frame 27.
8. Three planetary gears 29, support shaft 30, planetary gear support frame 3
1. The internal gear 32 constitutes a step-up gear mechanism (2) of the output stage.

The output stage planetary gear mechanism ■ is the final stage reduction mechanism that tightens the torque set bolt, and the output stage internal gear 3
The rear end of the internal gear 2 and the front end of the conjugate internal gear 9 are integrally connected by respective threaded parts 33, and the front end of the internal gear 32 of the output stage is provided with the following output extraction mechanism.

In other words, 34 is a hexagonal spline bored in the front protrusion of the output stage planetary gear support frame 31, and 35 is a hexagonal spline 34.
36 is a nut socket located on the outer periphery of the bolt grip socket 35, and the rear end of this nut socket 36 is connected to the front end of the internal gear 32 of the output stage. The two are connected via a dog clutch mechanism formed between them.

Numeral 37 is a cap screwed onto the outer peripheral surface of the tip of the internal gear 32 of the output stage to prevent the nut socket 36 from being pulled out, and 38 is a ball stop mechanism provided on the circumferential surface of the tip of the bolt grip socket 35. Prevents the bolt grip from accidentally falling off.

39 is an inner spring interposed between the flange 35a of the bolt grip socket 35 and the front end of the hexagonal spline 34;
The bolt grip socket 35 is always urged forward.

40 is the nut socket 36 when tightening the torque set bolt
A thrust bearing 41 is a metal member that pivotally supports the planetary gear support frame 31 of the output stage.

A torque set bolt tightening machine according to the present invention is constituted by the differential speed reduction device (C) equipped with the above-mentioned output extraction mechanism, the universal joint port, and the drive body (B).

In addition, 41 is each sun gear 12 of the output stage, intermediate stage, and input stage.
24. It passes through 28, and the tip is the bolt grip socket 3.
The bolt grip broke after tightening the torque set bolt with a knockout pin located inside the gear box 5 and with the rear end shaft 42 protruding by a predetermined length from the drilled hole in the lid 43 fixed to the top of the gear box 8. is discharged from the bolt grip socket 35.

Ejection is performed by lightly hitting the shaft end of the rear end shaft 42 that protrudes from the lid body 43. However, if the rear end shaft 42 protrudes from the lid body 43 and interferes with the fastening work, the knockout pin 41 is removed. The rear end shaft 42 is removed, and a coil spring (not shown) is interposed between the flange 41a of the knockout pin 41 and the groove bottom of the hexagonal spline 34, and the knockout pin 41 is removed.
is always urged forward of the bolt grip socket 35 to push out the broken bolt grip.

Next, this invention will be explained in detail.

Using the torque set bolt tightening machine according to the present invention, the third
To tighten the torque set bolt a inside the H-shaped steel shown in the figure, first grasp the grip bundle 20, and then connect the bolt grip socket 35 of the differential reduction gear C to the bolt grip part f, and the nut socket 36 to the nut e. Make it fit.

At this time, the tip of the knockout pin 41 is attached to the bolt gripping portion f.
The shaft end of the rear end shaft 42 comes into contact with the end surface of the lid body 43 and retreats together with the bolt grip socket 35, so that the shaft end of the rear end shaft 42 further protrudes from the upper surface of the lid body 43.

Next, the = end of the universal joint opening is held in the chuck mechanism 4 of the drive body A located at an arbitrary position apart from the differential reduction gear C, and the spline shaft 5 at the other end is bored at the tip of the small bevel gear shaft 6. It is fitted into the provided spline groove T, and the differential speed reduction device C and the drive body I are connected through the universal joint port.

After doing the above, when the trigger switch fixed to the grip handle 2 of the drive body I is turned on, the motor starts rotating, and this rotation is decelerated to a predetermined rotation speed by the speed reduction mechanism built into the drive body I. The small bevel gear 17 of the differential reduction gear C is driven through the universal joint port.

In the differential reduction gear C, the large bevel gear 1 meshes with the small bevel gear 17.
The sun gear 12 of the input stage planetary gear mechanism I, which is disposed coaxially with the input stage I, rotates at a reduced speed.

Then, the input stage planetary gear 21 meshing with this sun gear 12 is decelerated and rotates, and at the same time revolves at a further reduced rotation speed, and as a result, the input stage stepping gear 2
The input stage planetary gear support frame 22 supporting the input stage 1 and the sun gear 24 of the intermediate stage planetary gear mechanism 2 provided in front of the frame 22 are decelerated and rotated at the above-mentioned revolution speed.

Thereafter, in the same manner, the rotation of the sun gear 24 at the intermediate stage becomes a more reduced revolution speed by the planetary gear mechanism (2) at the intermediate stage, thereby rotating the sun gear of the planetary gear mechanism (2) at the output stage.

In the output stage planetary gear mechanism ■, the output stage planet gear 29 meshing with the output stage sun gear 28 also rotates, but at this time, the output stage planet gear 29 is supported via the support shaft 30. The planetary gear support frame 31 of the output stage cannot rotate because its tip is spline-coupled to the bolt grip socket 35 fitted to the bolt grip part f of the torque set pole (a). Therefore, only the planetary gear 29 in the output stage rotates.

The input stage and intermediate stage planetary gears 21, 25 revolve while rotating, and only the output stage planetary gear 29 rotates, so that the conjugate gears meshing with the planetary gears 21, 25, 29 of each stage are rotated. Gear 9 and output stage internal gear 3 connected thereto
2 rotates at a reduced speed in the opposite direction to the sun gears 12, 24, and 28 of each stage.

As a result, the nut socket 36 connected to the front of the internal gear 32 of the output stage via the clutch mechanism rotates, causing the nut e fitted in the nut socket 36 to screw, and tightening the torque set bolt a.

In this tightening, when the torque reaches a specified value, the bolt gripping portion f breaks from the breaking groove g, thereby completing the tightening.

Then, the nut socket 36 is prevented from rotating, the conjugate internal gear 9 and the output stage internal gear 32 stand still, and the output stage, intermediate stage, and input stage stepping gear support frames 22, 27, and 31 idle.

Therefore, the bolt grip socket 35 spline-connected to the tip of the planetary gear support frame 31 of the output stage rotates under no load, and the increased reaction force is not transmitted to the grip handle 20.

After that, the motor 1 of the drive body A is stopped, and the spline shaft 5 at the tip of the universal joint port is pulled out from the spline groove 7 of the small bevel gear shaft 6, or when the adjacent torque set bolt a is subsequently tightened. The spline shaft 5 is left fitted in the spline groove 7, and the differential speed reduction device C is lifted upward to remove the nut socket 36 from the nut e.

The broken bolt grip part f remaining fitted in the bolt grip socket 35 is discharged outward by lightly hitting the shaft end of the rear end shaft 42 of the knockout pin 41 protruding from the top of the lid body 43. .

In the embodiment, the driving body A is formed integrally with the grip handle 2, and the differential reduction gear C is driven by gripping the grip handle 2, but the invention is not necessarily limited to this form. do not have.

For example, as shown in FIG. 6, a driver port' is attached to the band 44, and instead of gripping the handle, the band 44 is attached to the string 44.
5, the tightening may be fitted onto a part of the worker's body.

Alternatively, the driver of the torque set bolt tightening machine of the present invention, which tightens large diameter torque set bolts, is quite heavy.
If it is not suitable to attach and hold the drive body to the band body 44, or if it is not suitable for work to attach and hold the drive body to the band body 44, in this case, a strong magnet is fixed to the base of the drive body. This driving body is then attracted to a suitable position on the building frame adjacent to the differential reduction gear that tightens the torque set bolt using the suction force of a magnet, and the differential reduction gear is driven from this position via the universal joint. It's okay.

Furthermore, the drive body may be provided with a locking device to lock and hold the drive body in a proper position on the frame.

This invention drives a driving body equipped with a motor from any position, and transmits this power via a universal joint to the output end of a bolt grip socket that fits into a torque set bolt grip and a nut socket that fits with a nut. This relates to a torque set bolt tightening machine that tightens torque set bolts by transmitting torque to a differential reduction gear connected to each other.
A differential reduction gear with a shorter overall length is placed inside the H-shaped steel,
By driving this differential speed reduction device from any nearby arbitrary position with a drive body via a universal joint, it is possible to tighten the torque set bolt at this position without any reaction force.

Further, when the total reduction ratio of the torque set bolt tightening machine according to the present invention for tightening a large diameter torque set bolt is /, the total reduction ratio is divided between the differential reduction gear and the drive body. You can arbitrarily allocate the share.

(For example, the reduction ratio of a differential reduction gear.

. When closed, the reduction ratio of the driving body is /2o.

) Then, by carefully considering the working environment, the size of the motor output, and the weight distribution between the differential reduction gear and the drive body, and selecting the distribution of the total reduction ratio, It is possible to provide a torque set bolt tightening machine that can perform light tightening work compared to a torque set bolt tightening machine.

[Brief explanation of drawings]

Figure 1 is a sectional view showing how the torque set bolt is used.
Fig. 2 is a drawing showing a state in which a torque set bolt is attached to an H-shaped steel, Figs. FIG. 4 is a front partial sectional view of the differential speed reduction device, FIG. 5 is a right side view thereof, and FIG. 6 is a diagram showing another example of the form of the driving body. 1...Motor, 20...Handle, 3
5... Bolt grip socket, 36...
・Nut socket, A... Drive body, mouth...
...Universal joint, c... Differential reduction gear.

Claims (1)

[Claims] 1. A drive body that is equipped with a motor and is configured to reduce the rotation of the motor to a predetermined rotation speed, a bolt grip socket that fits into the torque set bolt grip at the output end, and a nut socket that fits with the nut. A differential speed reduction device is connected to each other, and one end is connected to the output shaft end of the drive body and the other end is connected to the input end of the differential speed reduction device at an appropriate position, and the power of the drive body is transmitted to the differential speed reduction device. It is composed of a universal joint configured as shown in FIG. A torque set bolt tightening machine characterized in that the torque set bolt is tightened with the reaction force applied to the torque set bolt in a non-reactive state.