JP2008134061A - Tightening tool capacity determining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tightening tool capacity determining device capable of determining the tightening tool capacity, and recognizing the angle from snug torque from tightening completion of the fastening tool. <P>SOLUTION: This tightening tool capacity determining device comprises a cylindrical sealed vessel 1 having a piston 2 with a working fluid 3 filled therein, a male screw 5 which is screwed to a female screw 4 formed in the sealed vessel 1 to press the piston 2 by the rotational tightening operation by the tightening tool, and a tightening capacity determining member 7 subjected to the pressure of the working fluid 3 in the sealed vessel 1 via a small hole 6 formed in the sealed vessel 1. An angle plate 8 attached with angular scale is arranged rotation-adjustably around the female screw 4 in the sealed vessel 1, and a needle 9 of the angle plate 8 is disposed in the male screw 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for determining a tightening capability of a tightening tool, and in particular, a tightening capable of determining a tightening capability of a tightening tool and confirming an angle from the snag torque until the tightening is completed. The present invention relates to a tool tightening ability determination device.

Conventionally, as a tightening tool used for tightening bolts, nuts, screws and the like with a predetermined set torque, for example, a pneumatic or hydraulic torque wrench has been widely used.
By the way, in these tightening tools, the state of the power source such as the air pressure source and the power source (battery), the state of the tightening tool itself (for example, in the case of a hydraulic torque wrench, the operation enclosed in the torque wrench) Depending on the oil leakage and temperature, etc., tightening may not be performed with a predetermined set torque, resulting in variations in product quality and reducing product reliability.

  In order to cope with this problem, various devices for controlling or measuring a tightening torque by a tightening tool have been proposed and put into practical use. However, many of these devices are electrically used. It is intended to control and measure the tightening torque, and is not only expensive, but also requires expertise in its operation and management, and is difficult to handle. Under such conditions, there has been a demand for an apparatus that can easily determine the tightening capability of a tightening tool by a mechanical mechanism.

Therefore, the applicant of the present application has proposed a tightening capability determination device for a tightening tool in Patent Document 1 below.
The tightening capability judging device of this tightening tool is filled with hydraulic oil, screwed into a cylindrical sealed container provided with a piston, and a female screw formed in the sealed container, and then tightened by a tightening tool. The operation includes a male screw that presses the piston and a tightening ability determination member that is pressurized by hydraulic oil in the sealed container through a small hole formed in the sealed container. A small piston that receives the pressure of the hydraulic oil in the sealed container, a spring member that urges the small piston in a direction against the pressure of the hydraulic oil, a determination display member that moves according to the movement of the small piston, and a spring member And an adjusting member that adjusts the urging force of the.

However, this tightening tool tightening capability determination device can accurately determine the tightening capability of the tool, but it is possible to tighten the tool when the target tightening axial force is obtained by managing the tightening angle. The angle could not be confirmed.
Japanese Patent Laid-Open No. 2003-340741

  In view of the problems of the conventional tightening capability determination device for a tightening tool, the present invention determines the tightening capability of the tightening tool and confirms the angle from the snag torque until the tightening is completed. It is an object of the present invention to provide a tightening capability determination device for a tightening tool.

  In order to achieve the above object, the tightening capability judging device for a tightening tool according to the present invention is screwed into a cylindrical sealed container filled with hydraulic oil and provided with a piston, and a female screw formed in the sealed container. A male screw that presses the piston by a rotary tightening operation with a tightening tool, and a tightening ability determination member that is applied with pressure of hydraulic oil in the sealed container through a small hole formed in the sealed container; In the tightening capability judging device for a tightening tool, an angle plate with an angle scale is arranged around the female screw of the hermetic container so that the angle plate can be rotated, and a pointer for the angle plate is provided on the male screw. It is characterized by that.

  In this case, a piston that receives the pressure of the hydraulic oil in the sealed container through a small hole formed in the sealed container, a cylinder of the piston, and a spring that biases the receiving piston in a direction against the pressure of the hydraulic oil. The hydraulic oil receiver provided with these can be provided.

  According to the tightening capability determination device for a tightening tool of the present invention, the tightening tool is filled with hydraulic oil and screwed into a cylindrical sealed container having a piston and a female screw formed in the sealed container. A tightening tool comprising a male screw that presses the piston by a rotational tightening operation and a tightening capability determination member that is applied with hydraulic oil pressure in the sealed container through a small hole formed in the sealed container In the tightening ability judging apparatus, an angle plate with an angle scale is arranged around the female screw of the hermetic container so as to be able to adjust the rotation, and a pointer for the angle plate is provided on the male screw. Tighten to the snag torque with the attached tool, set the angle scale of the angle plate to 0 at this time, and tighten until the tightening tool shuts off to read the angle indicated by the angle plate pointer. And it makes it possible to check the angle of from Sunagutoruku of tightening tool until the tightening is completed.

  A receiving piston that receives the pressure of the working oil in the sealed container through a small hole formed in the sealed container; a cylinder of the receiving piston; and a spring that biases the receiving piston in a direction against the pressure of the working oil; By providing a hydraulic oil receiver equipped with, the hydraulic oil that increases in pressure according to the rotation of the male screw is received, the rotation of the male screw is lightened, the rotation angle of the male screw is increased, and the angle accuracy is easily obtained. Can do.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a tightening capability determination device for a tightening tool according to the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of a tightening capability judging device for a tightening tool of the present invention.
The tightening capability judging device of this tightening tool is filled with hydraulic oil 3 and screwed into a cylindrical sealed container 1 provided with a piston 2 and a female screw 4 formed in the sealed container 1 for tightening. Tightening capability determination in which the pressure of the hydraulic oil 3 in the sealed container 1 is applied through a male screw 5 that presses the piston 2 and a small hole 6 formed in the sealed container 1 by a rotary tightening operation using a tool. And a member 7.
The tightening capability determination device for the tightening tool includes an angle plate 8 provided with an angle scale around the female screw 4 of the hermetic container 1 so that the angle plate 8 can be rotationally adjusted. Eight pointers 9 are provided.

  The tightening ability determination member 7 includes a tightening ability determination member main body 70 that is screwed onto the sealed container 1, a small piston 71 that receives the pressure of the hydraulic oil 3 in the sealed container 1, and the small piston 71. A spring member 72 that urges the hydraulic oil 3 in a direction against the pressure of the hydraulic oil 3, a determination display member 73 that moves according to the movement of the small piston 71, a sheath tube 74 that slidably houses the determination display member 73, And an adjustment member 75 for adjusting the urging force of the spring member 72.

A strip-shaped display portion 73a is provided at the distal end portion of the determination display member 73 slidably disposed in the sheath tube 74, and the display portion 73a is exposed from the sheath tube 74 as shown in FIG. By doing so, the tightening ability of the tightening tool is determined.
In addition, an adjustment display section 76 that indicates a set value of the adjustment member 75 is provided on the surface of the tightening ability determination member main body 70 to which the adjustment member 75 is screwed, according to a position where the adjustment member 75 is screwed. .

In the present embodiment, a window portion 1 a for visually recognizing the piston 2 is formed on the peripheral wall of the sealed container 1, and an identification mark 2 a different in the axial position is provided on the peripheral surface of the piston 2.
Thus, the piston 2 whose initial position differs depending on the amount of the hydraulic oil 3 is used, and the amount of the hydraulic oil 3 can be confirmed by visually recognizing the identification mark 2a of the piston 2.

On the other hand, the angle plate 8 has a perforated disk shape, and is disposed around the female screw 4 of the hermetic container 1 so as to be capable of rotating adjustment, using an O-ring 81 provided on the hermetic container 1 side as a temporarily fixing pressing member. .
When the angle plate 8 is moved by the friction force of the O-ring 81, as shown in FIG. 3, the holding screw 82 provided on the sealed container 1 side is fastened with the tool T1. Can be firmly fixed.

The pointer 9 of the angle plate 8 is formed by protruding a needle in a lateral direction from a ring portion 91 fitted below the head of the male screw 5.
The ring portion 91 of the pointer 9 is screwed so as to be movable in the axial direction of the male screw 5, and when the number of tightening rotations of the male screw 5 increases and the pointer 9 is buffered to the angle plate 8, As shown in FIG. 3, the holding screw 92 can be loosened and moved upward by the tool T2.

Further, in this embodiment, apart from the tightening capability determination member 7, a hydraulic oil receiver 10 that receives the hydraulic oil 3 whose pressure increases as the male screw 5 rotates is provided in the sealed container 1.
The hydraulic oil receiver 10 includes a receiving piston 11 that receives the pressure of the hydraulic oil 3 in the sealed container 1 through a small hole 6 formed in the sealed container 1, a cylinder 12 of the receiving piston 11, and the receiving piston 11. And a spring 13 that is biased in a direction against the pressure of the hydraulic oil 3.
The hydraulic oil receiver 10 receives the hydraulic oil 3 whose pressure increases in accordance with the rotation of the male screw 5, thereby reducing the rotation of the male screw 5 and increasing the rotation angle of the male screw 5 to make it easy to obtain angular accuracy. be able to.

Next, a method for using the tightening capability determination device for the tightening tool will be described.
When judging the tightening ability, the piston 2 is pressed through the steel ball by rotating and tightening the male screw 5 screwed into the female screw 4 formed in the sealed container 1 with a tightening tool to be inspected. By operating, the pressure of the hydraulic oil 3 in the sealed container 1 is applied to the tightening ability determination member 7 through the small hole 6 formed in the sealed container 1.

When the pressure of the hydraulic oil 3 in the sealed container 1 is applied to the tightening ability determination member 7, the small piston 71 that receives the pressure of the hydraulic oil 3 biases the spring member 72 in a direction against the pressure of the hydraulic oil 3. Specifically, depending on the position of the determination display member 73 that moves in accordance with the movement of the small piston 71, the strip-shaped display portion 73a formed on the determination display member 73 is exposed from the sheath tube 74. The magnitude of the pressure of the hydraulic oil 3, that is, the magnitude of the torque applied to the male screw 5 by the tightening tool can be detected depending on whether or not to do so.
In this case, by adjusting the urging force of the spring member 72 by the adjusting member 75, it is possible to determine the tightening ability of the tightening tool under arbitrarily set tightening conditions.

Next, a method for confirming the tightening angle of the tool for obtaining the target tightening axial force will be described.
This is to obtain the desired tightening axial force by managing the tightening angle. Starting from a certain reference value, the bolt is rotated by a predetermined angle to obtain the desired tightening axial force. Used to get angle method tightening.
As the reference value, a determined torque is used as a rotation start point (a tightening angle start point), and the determined torque is referred to as a snag torque.
In other words, in the tightening capability determination device for a tightening tool of the present embodiment, the male screw 5 is tightened to the snag torque by the tightening tool to be inspected.
At the same time, as shown in FIG. 4B, by rotating the angle plate 8 with the tool T3, 0 of the angle scale of the angle plate 8 is adjusted to the position of the pointer 9 at this time.
Then, further tightening is performed until the tightening tool is shut off, and by reading the angle indicated by the pointer 9 of the angle plate 8, the angle from the snag torque of the tightening tool to the completion of tightening can be confirmed.

  Thus, the tightening capability determination device for a tightening tool of the present embodiment is filled with the hydraulic oil 3 inside, and the cylindrical sealed container 1 provided with the piston 2 and the female screw 4 formed on the sealed container 1 are screwed. In addition, the pressure of the hydraulic oil 3 in the hermetic container 1 is applied through the male screw 5 for pressing the piston 2 and the small hole 6 formed in the hermetic container 1 by the rotary tightening operation by the tightening tool. In the tightening capability determination device for a tightening tool comprising the tightening capability determination member 7, an angle plate 8 with an angle scale is disposed around the female screw 4 of the hermetic container 1 so as to be capable of rotational adjustment. Since the pointer 9 of the angle plate 8 is provided on the male screw 5, the male screw 5 is tightened to the snag torque with a tightening tool, and the angle scale 0 of the angle plate 8 is set to the position of the pointer 9 at this time and further tightened. Until the tool shuts off Tightening, by reading the angle indicated by the pointer 9 angle plate 8, it is possible to check the angle from Sunagutoruku of the tightening tool until tightening is completed.

  Further, the receiving piston 11 that receives the pressure of the hydraulic oil 3 in the sealed container 1 through the small hole 6 formed in the sealed container 1, the cylinder 12 of the receiving piston 11, and the receiving piston 11 to the pressure of the hydraulic oil 3. By providing the hydraulic oil receiver 10 provided with the spring 13 biased in the direction to resist, the hydraulic oil 3 whose pressure increases according to the rotation of the male screw 5 is received, and the rotation of the male screw 5 is lightened. The rotation angle of the male screw 5 can be increased, and the angle accuracy can be easily obtained.

As mentioned above, although the clamping capability determination apparatus of the clamping tool of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The structure described in the Example The configuration can be changed as appropriate without departing from the spirit of the invention, for example, by appropriately combining the two.
The configuration of the present invention can also be applied to a tightening capability determination device for a tightening tool that confirms the upper and lower tightening torque ranges by confirming the upper limit value of the tightening torque.

  The tightening capability determination device for a tightening tool of the present invention has characteristics that it can determine the tightening capability of the tightening tool and confirm the angle from the snag torque to the tightening completion of the tightening tool. Therefore, it can be used widely and suitably as a tightening capability determination device for a tightening tool that can also be used for angle method tightening.

It is sectional drawing which shows one Example of the clamping capability determination apparatus of the clamping tool of this invention. It is the same top view. It is the front view which fractured | ruptured a part of the clamping capability determination apparatus of the clamping tool. The tightening capability judging device of the tightening tool is shown, (a) is a plan view showing rotation adjustment of the angle plate, and (b) is a plan view showing a state where the adjusting member is set to the maximum set torque. The tightening ability judging member is shown, (a) is a partial front view showing a normal state, (b) is a partial front view showing a state where a set torque is output.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 1a Window part 2 Piston 2a Identification mark 3 Hydraulic oil 4 Female screw 5 Male screw 6 Small hole 7 Tightening ability judgment member 70 Tightening ability judgment member main body 71 Small piston 72 Spring member 73 Determination display member 73a Display part 74 Sheath pipe 75 Adjustment member 76 Adjustment display part 8 Angle plate 81 O-ring 82 Holding screw 9 Pointer 91 Ring part 92 Holding screw 10 Hydraulic oil receiver 11 Receiving piston 12 Cylinder 13 Spring

Claims (2)

  A cylinder-shaped sealed container filled with hydraulic oil inside, and a male screw that is screwed into a female screw formed in the sealed container, and that presses the piston by a rotary tightening operation using a tightening tool; In a tightening ability judging device for a tightening tool comprising a tightening ability judging member for applying hydraulic oil pressure in the sealed container through a small hole formed in the sealed container, around the female screw of the sealed container, An apparatus for determining a tightening ability of a tightening tool, characterized in that an angle plate with an angle scale is disposed so as to be capable of rotating, and a pointer for the angle plate is provided on the male screw.   A receiving piston that receives the pressure of the hydraulic oil in the sealed container through a small hole formed in the sealed container, a cylinder of the receiving piston, and a spring that urges the receiving piston in a direction against the pressure of the hydraulic oil. 2. The tightening capability determination device for a tightening tool according to claim 1, further comprising a hydraulic oil receiver.

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