JPS5953167A - Power torque wrench for shear bolt - 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] When tightening a bolt, as a means of checking whether the torque is acting correctly, there is a method in which the polygonal part at the tip of the bolt breaks away from the notch part when the tightening force reaches a certain level. However, if the notch breaks, it has the disadvantage that it cannot be retightened or disassembled without any noise, so recently a notch 4.4 has been installed in the center of the polygonal part 4.4 as shown in Fig. 4.
A high-strength torque tension bolt with a polygonal section 4.4 formed in two stages has been developed and has been well received in various fields. However, with conventional torque wrenches for tightening bolts, when re-tightening after a notch breaks, the torque limit point cannot be determined because there is no notch, and for this reason, it is difficult to tighten the bolt by feeling. It had to be done in portions.

The present invention relates to a patented torque wrench used for tightening or disassembling a high-strength torque tension bolt in which polygonal parts are formed in two stages at the tip of the bolt shaft. After the polygonal part of is broken and ejected, 2
When tightening the polygonal part of a step, the setting is set so that it can be stopped by catching it with h to a predetermined value before reaching the plastic limit point, and the bolt is marked as completed after re-tightening. At the same time, marks can be applied by spraying paint from inside the wrench.

The details will be explained below with reference to the embodiments shown in the drawings.

The present invention uses a wrench to individually rotate a socket body 2 for nut fitting that screws the nut 1 and a socket tube shaft 5 that rotates the polygonal part 4.4 formed at the shaft end of the bolt 3. Both sockets 2.5 are supported concentrically on the main body 6 on the inside and outside, and the sockets 2.5 are driven to rotate in opposite directions by the reaction force of the motor 7 through the planetary gears a and mB. Set to be able to move forward and backward in the direction,
The socket body 2 and the wrench body 6 are provided with contacts 10 and 11 such as proximity switches, and in the hollow interior of the socket tube 5 is a nozzle tube 12 for spraying paint that also serves as an extrusion rod.
It is fitted so that it can be slid forward and backward.

The socket body 2 has a fitting opening 2a for the nut 1 at its tip, internal teeth 2b are formed on the inner surface of the cylindrical portion, and a planetary gear 8 is connected to the inner tooth 2b.
A is engaged.

The socket tube shaft 5 has a fitting opening 5a in the hollow interior of the socket body 2 at its tip into which the polygonal part 4 (or 4) of the bolt end fits, and has external teeth on the outer periphery of the tip that mesh with the planetary gear 8a. 5b.

This socket tube shaft 5 is fitted and held within the hollow portion of the hollow cylindrical drive @13. A motor 7 is incorporated into a part of the main body 6, and a drive shaft 13 is rotationally driven through gears 14, 15, 16, and 17.

A sliding ring body 18 whose moderation is adjusted in the direction of rotation is fitted onto the wrench body 6, and a contact point 11 is attached to this. Sliding ring body 1
8 is fitted with a moderation spherical pad pressed by a spring 19,
It is positioned by fitting it into recesses 21 arranged at predetermined intervals on the outer periphery of the main body 6, and when changing the facing position, it can be adjusted as desired by forced rotation. A scale 22 is provided on the outer peripheral surface of the ring body 18 to facilitate minute adjustments.

The nozzle pipe 12 for spraying paint is inserted into the hollow interior of the socket pipe shaft 5, the tip end 12EL faces into the polygonal fitting opening 5a, and the rear end 12b protrudes from the rear end of the main body 6 to form a draw-in type. It is supported in contact with the pusher n and is slid forward when the pusher n is pushed.

A paint socket is provided on the rear upper surface of the wrench body 6, to which a paint container 25 is detachably connected and communicated with the nozzle pipe 12 through a pipe 26.

Pass the bolt 3 through the fastener 27, temporarily tighten the nut 1, apply this torque wrench to it, fit the nut L into the socket body 2, and with the inner socket tube shaft 5 and the polygonal part 4 fitted, the motor 7 is When the start switch n is operated, the socket body 2 rotates in the direction of tightening the nut 1 via the planetary gear mechanism 8, and the force that rotates the bolt polygonal part 4 in the opposite direction is transmitted to the inner socket tube shaft 5. Ru. Therefore, when the tightening force reaches a predetermined value, the notch 4a between the front and rear polygonal portions 4.4 is broken, so that the nut 1 is tightened against the bolt 3 with a predetermined torque. When the polygonal part 4 of the first stage is broken, the separated polygonal part 4 is pushed out with a push rod (nozzle pipe 12) and discharged to the outside.

When this first stage polygonal part 4 is screwed, the socket body 2 is in a position pushed forward with respect to the main body 6 by the spring 9, and therefore the two corresponding contacts 10 and 11 are at a distance apart. A (third
Diagram a).

If you want to tighten the bolt 3 and nut 1 even more strongly by using the second polygonal part 4 left on the threaded side of the bolt, press the wrench body 6 so that it fits into the nut 1 and the polygonal part 4, and the socket body will tighten. 2 is pushed toward the main body against the bias of the spring 9, so the contacts 1o and 11 are positioned close to each other as shown in FIG. 3 (bl), and tightening is performed by rotation in this state. Since there is no notch, if the bolt is screwed in without limit, the shear stress of the bolt will pass the yield point and enter the plastic limit region, but the contacts 1o and 11 located in the vicinity will be in the socket body 2.
Since it can be set in advance to detect the limit range by approaching or touching it by rotating, the switch can be turned off and stopped just before the limit range is detected. When retightening is completed, the material blows out from the tip opening 12a of the nozzle pipe 12 and spreads over the end surface of the polygonal portion 4. Therefore, the bolts were retightened.
A mark is attached to the nut by spraying this paint, so it will be checked later.

As explained above, this invention is applicable to the case where a high-strength torque tension bolt with a two-stage polygonal part provided at the tip of the bolt is re-tightened at the second stage polygonal part without a notch after the first stage is broken. For tightening, the limit point of force can be set in advance using a contact point such as a proximity switch, and the specified tightening can be performed safely and reliably. The paint sprayer that doubles as a push rod fitted into the hollow interior of the socket tube shaft can spray paint from the nozzle that serves as a mark, making it convenient for checking after tightening, and the structure is simple and durable. It can be implemented at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a torque wrench, with main parts shown in cross section. Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 (al(b)
4 is a side view showing the operating state of the contact, and FIG. 4 is a side view of the torque tension bolt. l...Nut 2...Socket body 3.
...Bolt 4.4...Polygonal part 5...Socket tube shaft 6...Wrench body 7...Motor
8 River planetary gear mechanism 9 Spring
10.11...Contact 12...Nozzle pipe applicant Sakamura Machinery Co., Ltd.

Claims (1)

[Scope of Claims] (1k) A nut fitting socket body for screwing the nut and a socket tube shaft for rotating the polygon formed at the shaft end of the bolt are attached to the wrench body so as to rotate independently. A torque wrench in which the sockets are supported concentrically on the inside and outside, and both sockets are driven by a motor to rotate in a vertical direction by the reaction force of each other through a planetary gear mechanism,
The socket body for fitting the nut is set to be movable in the axial direction with respect to the wrench body and the inner socket tube shaft via a spring, and contacts such as a proximity switch are provided oppositely to the socket body and the wrench body. A power torque wrench for shear bolts. (2) A nut-fitting socket body that threadably rotates a nut and a socket tube shaft that rotates a polygon formed at the shaft end of a bolt are supported concentrically inside and outside the wrench body so that they can rotate independently. In a torque wrench in which both sockets are driven by a motor to rotate in opposite directions by the reaction force of each other through a planetary gear mechanism, the nut-fitting socket body is attached to the wrench body and the inner socket tube shaft. A power torque wrench for shear bolts, which is movable forward and backward in the axial direction via a spring, and has a nozzle pipe for spraying powder that also serves as an extrusion rod fitted into the hollow interior of the socket tube shaft. β) A patented power torque wrench for bolts, characterized in that the contact point on the wrench body side is provided on a sliding ring body that can be adjusted in the direction of rotation with respect to the main body.