JP2002202213A - Tightening pressure detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection method capable of visually confirming a tightening pressure on the whole when mounting equipment is mounted on an installation face. SOLUTION: A pressure detection sheet 1 in which a pressure sensitive sheet 2 changing its color (or developing a color) by a pressure is integrally provided on an elastic plate 3 is provided. This pressure detection sheet 1 is inserted between the mounting equipment 4 and the installation face so as to stick out from an outer peripheral fringe of the mounting equipment 4 and is mounted by tightening a bolt 6. The pressure sensitive sheet 2 in a part where the mounting equipment 4 is in contact with a mounting face changes its color by tightening the bolt 6, and the elastic plate 3 is compressed. The elastic plate 3 in a sticking-out part 7 swells and is deformed by the compression of the elastic plate 3, an outer peripheral part of the mounting equipment 4 of the pressure sensitive sheet 2 is discolored by the stress, and the discolored part 8 is confirmed visually or by an optical sensor to detect pressures of the mounting equipment and the installation face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening pressure detecting method for detecting a tightening pressure when a small device such as a motor or a robot is mounted.

[0002]

2. Description of the Related Art Conventionally, a torque wrench has been used to detect the tightening pressure of a screw or the like, and a pressure-sensitive material such as a prescale (trade name) that changes color or develops color when subjected to pressure has been used for visual confirmation. Sheets are used. Also, JP-A-10-274225 discloses that
As shown in FIG. 5, a display unit 13 such as a soft material such as colored silicone rubber is interposed between the two flat washers 11 and 12, and the washer is placed between the bolt 14 and the tightened body 15. There has been proposed a tightened display body in which the display portion 13 is inserted from the washer by tightening the bolt 14 to form the protruding portion 16.

[0003]

However, the torque wrench can detect the screwing force of the bolt, but does not indicate the tightening pressure of the contact portion of the mounting device. Absent. Also, in the case of discoloring with the pressure-sensitive sheet sandwiched, the pressure-sensitive sheet is thin, and only the sandwiched part discolors, so it is difficult to see the discolored part from the outside, and there is a problem that it is easily damaged when using a transparent washer such as plastic. is there. For this reason, after tightening the pressure-sensitive sheet once, loosen the bolt to check the discoloration and tighten it to the original state, but it takes time and effort to work, and there is a possibility that the tightening state may change In addition, there was a disadvantage that the installation work time was increased.

Further, when a tightening display body having a display section sandwiched between flat washers is inserted between a bolt and a body to be tightened, and the protrusion of the display section due to tightening is visually observed, the tightening pressure of the bolt applied to the washer is required. However, it did not confirm what kind of pressure the tightened state of the entire contact portion of the equipment attached with the bolt was.

The present invention provides a detection method which eliminates the above-mentioned disadvantages, makes it possible to easily confirm the tightening pressure between the mounting device and the installation surface from the outside, and reliably detects the tightening state of the mounting device. .

[0006]

For this purpose, a pressure-sensitive sheet that changes color (including color) by receiving a pressure is provided with a pressure detection sheet integrally provided on the surface of the elastic plate, and is provided between the mounting device and the installation surface. The pressure detection sheet is inserted so as to protrude from the contact portion between the mounting device and the installation surface to the outer periphery, and the elastic plate is compressed by the tightening pressure to cause deformation of the protruding portion. The tightening pressure is detected by visually checking the discoloration or by a sensor. The pressure detection sheet uses a transparent pressure-sensitive sheet when it is not subjected to pressure, the lower layer is a pressure-sensitive sheet that changes color at low pressure, and the upper layer is a pressure-sensitive sheet that changes color at high pressure. May be provided integrally.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure detecting sheet is formed by laminating a pressure-sensitive sheet which changes color or develops color under pressure and an elastic plate such as a rubber plate by gluing or coating. In addition, it is preferable to use a pressure-sensitive sheet in which the degree of discoloration gradually or stepwise changes depending on the pressure, but when no pressure is applied, the sheet is transparent, and is formed by stacking a plurality of sheets each of which develops a color at a different pressure. May be.

The pressure detecting sheet is made slightly larger than the mounting surface of the mounting device so as to protrude from the outer peripheral edge of the mounting device, and the space between the mounting surface and the mounting surface of the mounting device is wide between the mounting device and the mounting surface. The pressure sensing sheet of the pressure detection sheet protrudes from the smaller outer peripheral edge of the elastic plate, and is tightened. The elastic plate at the portion in contact with the mounting surface of the mounting equipment is compressed by the tightening pressure, but the compressive force is not applied to the protruding part. The pressure sheet is discolored or colored, and the discoloration or coloring can be confirmed visually or by an optical sensor because it is outside the mounting device, and the pressure between the mounting device and the installation surface can be detected based on the degree of discoloration.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 3 is a side view showing an example of the pressure detection sheet 1. Reference numeral 2 denotes a pressure-sensitive sheet that changes color gradually according to the degree of pressure when pressure is applied. Reference numeral 3 denotes an elastic plate such as a rubber plate having an appropriate thickness. The pressure-sensitive sheet 2 and the elastic plate 3 are integrated by, for example, bonding or applying a pressure-sensitive sheet material to the surface of the elastic plate.

FIGS. 1 and 2 are side sectional views showing a state in which the mounting device 4 is mounted on the installation surface 5 using the above-described pressure detecting sheet 1. FIG. 1 shows a state before the bolt 6 is tightened. Indicates the state after tightening, respectively.
The pressure detection sheet 1 is exaggerated for explanation. The mounting device 4 is placed on the installation surface 5 via the pressure detection sheet 1,
It is fastened at several places by bolts 6 and attached. When the mounting surface of the mounting device 4 is smaller than the installation surface as shown in FIG.
, And the pressure-sensitive sheet 2 is inserted so as to come into contact with the mounting device 4, and a protrusion 7 is formed on the outer periphery of the mounting device 4. In addition, the protruding part 7 is actually 2 to 5 mm.
A degree is enough.

In the state shown in FIG. 1, since the bolts 6 are not tightened, the pressure-sensitive sheet 2 is not discolored. When the bolt 6 is tightened as shown in FIG. 2, the pressure detection sheet 1 at the portion in contact with the mounting surface of the mounting device 4 is compressed, the color of the pressure-sensitive sheet 2 is changed, and the elastic plate 3 is compressed. Since no compressive force is applied to the
The elastic plate 3 is deformed and swells due to the inner compression, and the stress causes the outer peripheral edge of the mounting device of the pressure-sensitive sheet 2 to change color as shown by a mesh. Since the discoloration portion 8 protrudes outward from the peripheral edge of the mounting device 4, it can be surely confirmed from the outside visually or by an optical sensor. The pressure is detected in comparison with the degree. Therefore, the discoloration of the pressure-sensitive sheet 2 in the protruding portion 7 surrounding the attachment device 4 is as follows.
By tightening the respective bolts 6 so as to have the same color as the predetermined color over the entire circumference, the mounting device 4 can be mounted on the installation surface 5 with a uniform pressure, and the tightening pressure is changed to a color change of the pressure-sensitive sheet 2. You can check with

The pressure-sensitive sheet 2 of the pressure detecting sheet 1
As shown in FIG. 4, when a pressure is not applied, a transparent sheet is used, and a pressure-sensitive sheet 2a that develops or discolors at a low pressure in a lower layer near the elastic plate 3 and a sensor that develops or discolors at a high pressure on an upper layer. The pressure sheet 2b may be configured to overlap, and a change due to pressure may be detected by a change in each layer. Also,
When the mounting surface is large, the central portion of the pressure detection sheet 1 may be omitted.

[0013]

As described above, according to the present invention, the pressure detecting sheet having the pressure sensitive sheet integrally provided on the surface of the elastic plate is inserted between the mounting device and the mounting surface so as to protrude from the outer periphery of the contact portion,
Since the discoloration of the pressure-sensitive sheet at the protruding part due to the tightening pressure is checked and the tightening pressure is detected, not only the tightening pressure of the bolt part but also the tightening pressure of the entire mounting equipment can be detected, and the mounting equipment can be detected. Since the discoloration can be confirmed on the outside, visual observation is easy, and the effect of quickly and surely detecting the tightening pressure without the need for labor such as loosening the tightening can be obtained. In addition, since it can be checked on the entire outer periphery of the mounting device, one-sided tightening can be prevented, the vibration-proof effect by the elastic plate can be obtained, and rattling of the device and loosening of bolts can be prevented, and mounting can be ensured.

The pressure detecting sheet is a pressure-sensitive sheet that is transparent when no pressure is applied. The pressure-sensitive sheet that changes color at low pressure is used as the lower layer, and the pressure-sensitive sheet that changes color at high pressure is used as the upper layer. If they are provided integrally on the surface of
It is possible to easily confirm when tightening is performed in a certain pressure range.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing an embodiment of the present invention, showing a state before tightening.

FIG. 2 is a side sectional view showing a state after tightening in the embodiment of FIG. 1;

FIG. 3 is a side view showing an embodiment of the pressure detection sheet according to the present invention.

FIG. 4 is a side view showing an example of another pressure detection sheet.

FIG. 5 is a side sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure detection sheet 2 Pressure-sensitive sheet 3 Elastic plate 4 Mounting device 5 Installation surface 6 Bolt 7 Protruding part 8 Discoloration part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidekazu Miyakawa 2-1 Kurosaki Castle Stone, Yawatanishi-ku, Kitakyushu-shi, Fukuoka F-term (reference) 2F051 AB03 BA07

Claims (2)

[Claims] 1. A pressure detecting sheet, which is provided integrally with a surface of an elastic plate and changes its color by receiving pressure between an installation device and an installation surface, from a contact portion between the installation device and the installation surface to an outer periphery. A method for detecting a tightening pressure, comprising inserting the elastic plate so as to protrude, compressing the elastic plate by the tightening pressure to cause deformation of the protruding portion, and detecting the tightening pressure by the discoloration of the pressure-sensitive sheet at the deformed protruding portion. 2. A pressure-sensitive sheet which is transparent when the pressure-sensitive sheet is not subjected to pressure and discolors at a low pressure as a lower layer, and a pressure-sensitive sheet discolored at a high pressure as an upper layer and is integrally formed on the surface of the elastic plate. 2. The method according to claim 1, further comprising the step of: