JP3140149B2 - Rotary torque checker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to be used for rotation with a power type screw tightening machine, and to reduce the tightening force of the power type screw tightening machine at the time of tightening the object. The present invention relates to a rotary torque checker that can be measured simultaneously with attachment.

[0002]

2. Description of the Related Art Conventionally, bolts have been
When measuring the tightening force of a tightening machine when tightening a joint such as a nut, the joint tightened by the power type screw tightening machine is inspected with a torque wrench for inspection (digital torque wrench with a scale). The tightening force of the body to be joined is measured by a power screw tightening machine by retightening and returning.

[0003] Further, a method of measuring the tightening force by the conventional power screw tightening machine will be described with reference to FIG. 1. A test piece 1 for a power screw tightening machine is connected to a power rotary screw tightening machine 2. And the test piece 1 is tightened by the driving force of the screw tightening machine 2. When the tightening is completed, the output from the strain gauge incorporated in the torque tester 4 is output. The tightening force is detected based on the signal, and the tightening force of the test piece is displayed on the display 5 to measure the tightening force by the power screw tightening machine.

[0004]

However, according to the conventional measuring method, it is not possible to measure the tightening force of the object while the object is being tightened by the power type screw tightening machine. After attaching, tighten with a torque wrench for inspection (with a scale, digital torque wrench)
The measurement is performed by returning, or the reaction force generated when the object is fastened is detected as a torque by a strain gauge. Therefore, it is not possible to directly measure the tightening force of the joined body by tightening the joined body at the same time as the fastening operation of the joined body. In addition, the torque detecting method based on the reaction force of the power type screw tightening machine can be measured only by the reaction force of the tightening torque and not by the tightening torque applied to the body to be connected. there were.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has a square hole which can be fitted to a square drive of a power screw tightening machine, and has a power hole on one side thereof. A torque sensor shaft that has a square drive that can be fitted with a socket for a screw-type screw tightening machine, and further has a strain gauge with a strain gauge attached to the peripheral surface, and a display for displaying the tightening force of the power screw tightening machine. A rotary torque checker with a built-in display has been developed.This rotary torque checker is rotated together with the power screw tightening machine to tighten the workpieces and directly adjust the tightening torque of the power screw tightening machine. It is to provide a rotary torque checker that can be measured.

[0006] The measured value measured by the rotary torque checker can be stored as a data value by a microcomputer built in the rotary torque checker, and can be displayed as necessary. The measurement values stored in the checker are provided as a rotary torque checker capable of transmitting the measurement values to another FA system device by a communication mechanism using infrared rays.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

Referring to FIGS. 2 to 6, the structure of the rotary torque checker 10 will be described. Reference numeral 11 denotes a cylindrical case having both side walls 11A and 11B spaced apart in the axial direction, and a torque sensor shaft (torsion bar) penetrating through the both side walls 11A and 11B in the axial direction of the case 11. 12 is penetrated, and the one side wall 11A and the torque sensor shaft 12 are integrally connected to each other, and the other side wall 11B and the torque sensor shaft 12
It is held in a non-coupled state. This torque sensor shaft 12
At the end protruding from the side wall 11A side, there is formed a fitting hole 15 into which a square drive 14 provided in a power type rotary screw tightening machine 13 is fitted. At the other end (a protruding end from the side wall 11B side), a square drive 18 to be fitted into a socket 17 to be fitted to the joined body 16 is formed. A strain gauge 19 is provided on a peripheral surface of a central portion of the torque sensor shaft 12, and the strain gauge 19 is connected to a display control circuit 20, and the display control circuit 20 further includes a liquid crystal provided in the case 11. Connected to the display 21, the distortion value of the torque sensor shaft 12 at the time of screw tightening can be visually confirmed from outside the case via the liquid crystal display 21. The distortion value displayed on the liquid crystal display 21 is sequentially recorded by the storage means provided in the display control circuit 20. The order in which the objects are fastened and the tightening values (measured values) at that time are automatically and sequentially stored. The case is provided with a battery for driving the display control circuit 20 and the display.

The rotary torque checker 10 according to this embodiment is constructed as described above. Next, the operation thereof will be described. A power type rotary screw tightener is fitted in a fitting hole 15 of the rotary torque checker 10. Drive 13 of machine 13
4 and its rotary torque checker 10
The socket 17 is fitted and connected to the square drive 18.

Next, after the socket 17 is fitted to the body 16 to be connected (screw), the power type rotary screw tightening machine 1 is mounted.
3, the torque of the power rotary screw tightening machine 13 is transmitted to the object 16 via the rotary torque checker 10 and the socket 17, and as a result, the tightening of the object 16 is completed. You.

At the time of completion of the tightening, the tightening force required for the tightening is detected by the distortion of the torque sensor shaft 12 of the rotary torque checker 10, and the corresponding number of the coupled body 16 and the tightening force are detected. Is displayed on the liquid crystal display panel 21 in the rotary torque checker 10, and at the same time, the corresponding number and the tightening value are stored (recorded). In the same manner, by sequentially tightening the other joined bodies 16,
In each case, the display of the number and the tightening value of the object 16 and the storage thereof are sequentially accumulated. The accumulated number depends on the capacity of the storage means, but, for example, the tightening value of up to 100 objects can be recorded. The measured values stored in the storage means are stored in the rotary torque checker 10.
It can also be transferred to other FA system equipment using the infrared rays emitted from it.

[0012]

As described above, according to the present invention, at one end, a fitting hole to be fitted to a square drive of a power screw tightening machine is formed,
At the other end, a torque sensor shaft that forms an angular drive engaged with the object to be connected is made to penetrate the above-mentioned both side walls of the cylindrical case having both side walls that are spaced apart from each other. The one end penetrating portion is integrally connected to the one side wall,
The other end penetrating portion of the torque sensor shaft is held in a non-coupled state with respect to the other side wall. Further, the torque sensor shaft 2 is attached with a strain gauge located in the case. A display control circuit for recording and displaying the corresponding number of each object and the fastening torque value of the object corresponding to the number of the object, and a liquid crystal display that allows the display value to be viewed from outside the case According to this, the rotary torque checker is provided between an existing power-type screw tightening machine having no fastening torque detection mechanism and its display mechanism and the coupled body. In this case, the fastening torque of the body to be fastened by the power screw tightening machine is changed by the fastening worker through an indicator provided on the torque checker. In order to be able to visually confirm the original, it is easy to manage and understand the fastening torque value.

Further, according to this rotary torque checker, for example, the corresponding number of the object to be fastened for each fastening operation and the respective fastening values corresponding to the corresponding number are sequentially recorded. Even if the visual recognition of the displayed value is lost, the displayed value can be reconfirmed, and the effect that the data management of the tightening torque and the like can be extremely easily performed is obtained.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a conventional example.

FIG. 2 is a front view of the rotary torque checker according to the embodiment of the present invention.

FIG. 3 is a right side view of the rotary torque checker according to the embodiment of the present invention.

FIG. 4 is a left side view of the rotary torque checker according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of the internal structure of the rotary torque checker according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a checker use state according to the embodiment of the present invention.

DESCRIPTION OF THE INVENTION

DESCRIPTION OF SYMBOLS 10 ... Rotary torque checker 11 ... Case 12 ... Torque sensor shaft 13 ... Power rotary screw tightening machine 14 ... Square drive 15 ... Fitting hole 16 ... Coupling object 17 ... Socket 18 ... Square drive 19 ... Strain gauge 20 ... Display control circuit 21 Liquid crystal display

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G01L 3/00-5/24 B23P 19/06

Claims (1)

(57) [Claims] 1. A torque sensor having, at one end, a fitting hole to be fitted to a square drive of a power screw tightening machine, and at the other end, a square drive to be engaged with an object to be coupled. The shaft is made to penetrate the both side walls of the cylindrical case having both side walls separated from each other, and one end penetrating portion of the torque sensor shaft is integrally connected to the one side wall, and the other end of the torque sensor shaft is connected. The end penetration portion is held in an uncoupled state with respect to the other side wall,
Further, the torque sensor shaft 2 is mounted with a strain gauge located in the case, and further, in the case, the corresponding numbers of the respective joined bodies and the fastening of the joined bodies corresponding to the numbers of the joined bodies. A rotary torque checker comprising: a display control circuit for recording and displaying a torque value; and a liquid crystal display which allows the display value to be viewed from outside the case.