JP2018164949A - Fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work management property in a fastening work.SOLUTION: A fastening tool that makes a user perceive that a set torque generated when fastening a fastening member by an operation of a worker reaches a set torque value includes: a torque value setting part which can set a set torque value at a predetermined value by a rotary operation; an operation part which is attachably/detachably mounted on the torque value setting part and can operate the torque value setting part on mounting; an electronic storage medium which is provided on the operation part and stores information including identification information inherently applied to the operation part; an attaching/detaching mechanism which can attach/detach to/from the operation part and the torque value setting part; and an information processing section which performs processing of transmitting/receiving information to/from the electronic storage medium when the operation part is mounted on the attaching/detaching mechanism.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a tightening tool.

  Conventionally, the tightening torque generated when tightening bolts and nuts at the tightening location has reached the torque value set in advance for the tightening tool (hereinafter referred to as “set torque value”). A torque wrench is known as a tightening tool that allows a worker to perceive and manage the tightening torque. In general, the torque wrench includes a so-called pre-lock type torque wrench in which the operator cannot change the set torque value unless a setting tool or the like is used, and a so-called preset type torque wrench in which the set torque value can be changed by the operator's operation. There is.

  Pre-lock torque wrench makes it easy to manage the tightening torque value when tightening is always performed at a specified tightening torque value, such as tightening a wheel nut of an automobile. Whenever there is a place, it is necessary to set a set torque value using a tool.

  With preset type torque wrenches, the set torque value according to the tightening location can be set individually, but when managing the tightening torque, the set torque value is appropriately set according to the specified value corresponding to the tightening location. Must be set.

  In order to improve the so-called traceability in which it is possible to track that the tightening torque of the tightening member is an appropriate value in the tightening operation, an appropriate set torque is set in the torque wrench and the set torque is set. It is required that the set torque cannot be easily changed.

  In addition, in the torque wrench, a technique for transmitting the torque wrench serial number and torque value is disclosed in order to reliably specify which torque tool is used to tighten the bolt (see, for example, Patent Document 1). .

JP 2008-307671 A

  However, although the technique of Patent Document 1 can specify the tightening torque value (hereinafter also referred to as “actually measured value”) when the tightening member is actually tightened, and the torque wrench used for the tightening work, The operator who set the set torque value for each torque wrench cannot be identified, and the set torque value thus set cannot be easily changed.

  An object of the present invention is to improve work manageability in tightening work.

  The present invention provides a tightening tool that allows a user to perceive that a tightening torque generated when a tightening member is tightened by an operator's operation has reached a preset set torque value. A torque value setting unit that can be set to a predetermined value, an operation unit that is detachably attached to the torque value setting unit, and that can operate the torque value setting unit when mounted, and is provided in the operation unit. An electronic storage medium that stores information including identification information that is uniquely given, an attachment / detachment mechanism that allows the operation unit and the torque value setting unit to be attached / detached, and an electronic device when the operation unit is attached to the attachment / detachment mechanism. An information processing unit that performs processing for transmitting and receiving information to and from the storage medium.

  In the present invention, the information processing unit determines that the set torque value can be set in the torque value setting unit when the process of transmitting and receiving information to and from the electronic storage medium can be performed. When the process of transmitting / receiving information to / from the storage medium cannot be executed, it may be determined that setting of the set torque value in the torque value setting unit is impossible.

  The present invention further includes a rotation angle detection unit that detects a rotation angle of the torque value setting unit and outputs rotation angle information based on the detected rotation angle, and the information processing unit is configured to output a torque value based on the rotation angle information. A set torque value set in the setting unit may be calculated, and the calculated set torque value may be stored in the electronic storage medium as information.

  The present invention also includes a strain gauge that electrically detects the amount of strain generated in the tightening tool when the tightening member is tightened, and the information processing unit is configured to tighten the tightening member based on the strain amount detected by the strain gauge. It is also possible to calculate an actual measured value of the tightening torque at the time of tightening and store the calculated actual measured value as information in the electronic storage medium.

  The present invention may also include a communication unit that communicates information with an external device.

  According to the present invention, work manageability in tightening work can be improved.

1 is a perspective view of a torque wrench showing an embodiment of a tightening tool according to the present invention. It is a front view of the torque wrench shown in FIG. It is a bottom view of the torque wrench shown in FIG. It is a fragmentary sectional view which shows the internal structure of the torque wrench shown in FIG. It is a fragmentary sectional view which shows the internal structure of the state in which the load more than a predetermined setting torque value was added in the torque wrench shown in FIG. It is a fragmentary sectional perspective view which shows the rotation angle detection part of the torque wrench shown in FIG. It is a block diagram which shows the rotation angle detection part of the torque wrench shown in FIG. It is a fragmentary sectional perspective view which shows another example of the rotation angle detection part of the torque wrench shown in FIG. It is a fragmentary sectional view which shows the structure of the torque value setting grip and attachment / detachment mechanism of the torque wrench shown in FIG. FIG. 2 is a partial cross-sectional view showing a state where a torque value setting grip is attached to a grip receiving portion in the torque wrench shown in FIG. 1. FIG. 2 is a partial cross-sectional view illustrating a state where a torque value setting grip is detached from a grip receiving unit in the torque wrench illustrated in FIG. 1. It is a flowchart which shows the mode judgment process by the information processing part of the torque wrench shown in FIG. It is a schematic diagram which shows the display part of the torque wrench shown in FIG.

  Hereinafter, embodiments of a tightening tool according to the present invention will be described with reference to the drawings. In the following description, as an example of a tightening tool that causes the work vehicle to perceive that the tightening torque has reached a preset set torque value, torque that can set the set torque value by rotating the operation unit A torque wrench that is an example of a tightening tool including a value setting unit will be described.

[Configuration of torque wrench]
FIG. 1 is a perspective view of a torque wrench 10 showing an embodiment of a tightening tool according to the present invention. FIG. 2 is a front view of the torque wrench 10. As shown in FIGS. 1 and 2, the torque wrench 10 is a so-called mechanical preset type torque wrench. The torque wrench 10 generates noise and vibration when the head portion 12 rotated by the torque generated during the tightening operation comes into contact with the case 11, and makes the operator perceive that the tightening torque has reached the set torque value. . The torque wrench 10 includes a case 11, a head unit 12, a head pin 13, a torque value setting unit 18, and a rotation angle detection unit 19.

  The case 11 is a substantially cylindrical member that accommodates the components of the torque wrench 10 such as the head portion 12 and constitutes the outer shape of the torque wrench 10. The case 11 is provided with a head portion 12 at one end. Further, the case 11 is provided with a torque value setting unit 18 and a rotation angle detection unit 19 at the other end.

  FIG. 3 is a bottom view of the torque wrench 10. As shown in FIG. 3, the head portion 12 is provided with a ratchet head 121. The ratchet head 121 is exposed from the case 11. The ratchet head 121 is provided with a socket connecting portion 124 so that a socket wrench (for bolt or nut tightening) (not shown) that engages with the tightening member can be detachably attached.

  FIG. 4 is a partial cross-sectional view showing the internal structure of the torque wrench 10. In FIG. 4, in order to show the internal structure of the torque wrench 10, only the case 11 and the housing 198 of the rotation angle detector 19 are shown in cross section. As shown in FIG. 4, inside the case 11, as an internal structure of the torque wrench 10, an arm 122 and a contact portion 123 of the head portion 12, a gain adjusting screw 14, a link 15, a slider 16, and a spring guide. 17, a torque value setting unit 18, and a strain gauge 199 are accommodated.

  The head portion 12 is provided with an arm 122 and a contact portion 123 inside the case 11. The head portion 12 is pivotally supported with respect to the case 11 by a head pin 13 provided at the boundary between the ratchet head 121 and the arm 122.

  The arm 122 is housed inside the case 11. Since the head portion 12 is pivotally supported on the case 11 by the head pin 13, the arm 122 can rotate inside the case 11 around the head pin 13.

  The contact portion 123 is provided at the tip of the arm 122. When the arm 122 rotates inside the case 11, the contact portion 123 comes into contact with the inner wall of the case 11 and emits sound and vibration. The contact portion 123 is provided in a direction in which the arm 122 rotates when a load due to a tightening operation is applied to the head portion 12. Further, a gain adjusting screw 14 is provided at the tip of the arm 122 of the head portion 12 in a direction in which the arm 122 rotates when a load due to a tightening operation is removed from the head portion 12. The gain adjusting screw 14 is provided to adjust the gain of the operation of the arm 122 when a tightening torque is applied to the torque wrench 10. The arm 122 is provided with a link 15 connected to the slider 16 by a link mechanism.

  The slider 16 has one end connected to the arm 122 via the link 15 and the other end connected to the spring guide 17. The slider 16 moves in the longitudinal direction inside the case 11 when the case 11 rotates with respect to the head portion 12. The slider 16 includes a roller that contacts the inner wall of the case 11. The roller guides the movement of the slider 16 in the case 11.

  The spring guide 17 is a substantially cylindrical member. The spring guide 17 is formed in a cylindrical shape, and is disposed inside the case 11 so that the axis of the case 11 and the axis of the spring guide 17 substantially coincide with each other. The spring guide 17 guides the movement of the spring part 181 of the torque value setting part 18. The spring guide 17 has a hole in the center of the bottom surface. The hole of the spring guide 17 is inserted into the other end of the slider 16. The spring guide 17 has one end of the spring portion 181 in contact with the other bottom surface.

  The torque value setting portion 18 includes a spring portion 181, a torque value display portion 182, a setting bolt 183, and a lock nut 184 inside the case 11. The torque value setting unit 18 includes a torque value setting grip 185 outside the case 11. The torque value setting unit 18 rotates the torque value setting grip 185 to change the compression force of the spring part 181 so that the set torque value can be set.

  The spring portion 181 is a compression spring in which the longitudinal direction of the torque wrench 10 is the compression direction. For the spring portion 181, for example, a coil spring can be used. One end of the spring portion 181 is in contact with the other plane of the spring guide 17 as described above.

  The torque value display unit 182 is a substantially cylindrical member disposed inside the case 11. The torque value display portion 182 is arranged such that one end is in contact with the other end of the spring portion 181 and the other end faces the torque value setting grip 185. The torque value display unit 182 displays a scale indicating the set torque value set on the surface. A rotation stopper (not shown) is attached to the inner wall of the case 11. The torque value display unit 182 is provided so as to be slidable in the axial direction of the torque wrench 10 with respect to the rotation stopper. Due to this rotation prevention, the torque value display portion 182 moves in the axial direction without rotating inside the case 11. For this reason, the scale of the torque value display unit 182 can always be read from the display window provided in the case 11. In addition, the torque value display portion 182 is provided with a female screw penetrating in the longitudinal direction at the center.

  The setting bolt 183 is screwed into the female screw of the torque value display portion 182. The setting bolt 183 has a hook-shaped portion engaged with the lock nut 184.

  The lock nut 184 is a substantially disk-shaped member that is fixed inside the case 11. The lock nut 184 is provided with a hole into which the shaft-like portion of the setting bolt 183 is inserted at the center.

  The torque value setting grip 185 is a substantially cylindrical member provided at the other end of the torque wrench 10. The torque value setting grip 185 has a function as an operation unit that enables the torque value setting unit 18 of the torque wrench 10 to be operated. The torque value setting grip 185 is connected to the setting bolt 183 via the rotation angle detector 19 and rotates the setting bolt 183. The detailed structure of the torque value setting grip 185 will be described later.

  The strain gauge 199 is provided at a location where distortion occurs in the torque wrench 10 during the tightening operation, for example, at an appropriate position of the arm 122 of the head unit 12. The strain gauge 199 electrically detects the amount of strain generated in the arm 122. The strain gauge 199 outputs information on the detected strain amount. For example, the strain gauge 199 detects the amount of strain according to a change in electrical resistance value when strain is applied to the metal material. For example, the strain gauge 199 is attached to the surface of the arm 122 so that the strain generated in the arm 122 can be accurately detected. Further, the number of strain gauges 199 may be one or plural for one torque wrench 10. In the torque wrench 10, a strain detection device other than the strain gauge 199 may be used.

[Torque wrench operation]
The operation of the torque wrench 10 described above will be described by taking as an example a case where the operator performs the tightening operation of the tightening member with a predetermined tightening torque value.

  When the torque value setting grip 185 is rotated, the setting bolt 183 is rotated together with the torque value setting grip 185. When the setting bolt 183 rotates, the torque value display portion 182 moves inside the case 11 to compress the spring portion 181 and the compression force of the spring portion 181 changes. The operator confirms that the set torque value indicated by the torque value display unit 182 is a predetermined value, stops the rotation operation of the torque value setting grip 185, and shifts to the tightening operation.

  FIG. 5 is a partial cross-sectional view showing the internal structure of the torque wrench 10 in a state where a load greater than a predetermined set torque value is applied. As shown in FIG. 5, in the torque wrench 10, when the tightening member is tightened, the compressive force from the spring portion 181 acts on the head portion 12 via the slider 16 and the link 15. When the tightening torque reaches the set torque value set by the torque value setting section 18, the force generated by the tightening torque exceeds the compressive force from the spring section 181, and the case 11 and the slider 16 are shown in FIG. It moves from the state to the state of FIG.

  The case 11 rotates around the head pin 13 so that the inner wall of the case 11 contacts the contact portion 123. In the torque wrench 10, when the contact portion 123 comes into contact with the inner wall of the case 11, sound and vibration are generated from the torque wrench 10.

[Configuration and operation of rotation angle detector]
Next, the configuration and operation of the rotation angle detector 19 will be described.

  FIG. 6 is a partial cross-sectional perspective view showing the rotation angle detector 19 of the torque wrench 10. In FIG. 6, only the housing 198 of the rotation angle detector 19 is shown in a cross-sectional view. As shown in FIG. 6, the rotation angle detection unit 19 includes a rotation shaft 191, a substrate 192, an encoder unit 193, a disk 194, an information processing unit 195, a communication unit 196, and a housing 198. Is provided.

  The rotary shaft 191 is connected to the setting bolt 183 and the torque value setting grip 185 shown in FIG. The rotating shaft 191 transmits the rotational force from the torque value setting grip 185 rotated by the operator to the setting bolt 183.

  The substrate 192 is a member on which electronic components such as the encoder unit 193, the information processing unit 195, and the communication unit 196 can be placed. As the substrate 192, a known electronic circuit substrate such as a printed circuit board can be used. The substrate 192 is provided with a hole through which the rotary shaft 191 passes.

  FIG. 7 is a block diagram showing the rotation angle detector 19 of the torque wrench 10. As shown in FIG. 7, the encoder unit 193 includes a light emitting element 193a, a light receiving element 193b, and a signal processing unit 193c. As the encoder unit 193, any of an absolute encoder and an incremental encoder generally known as a rotary encoder can be used.

  The light emitting element 193a is various light sources such as a light emitting diode and a laser diode. The light emitting element 193a functions as a light emitting unit that emits light toward the disk 194.

  For example, a photodiode can be used as the light receiving element 193b. The light receiving element 193b functions as a light receiving unit that receives light that has not been changed in its light receiving state by the action of reflection, light shielding, or refraction by the disk 194 among the light emitted from the light emitting element 193a. The light receiving element 193b outputs a light reception signal based on the received light.

  The signal processing unit 193c performs signal processing such as amplification on the light reception signal output from the light receiving element 193b, detects the rotation angle of the setting bolt 183, and uses electronic information based on the detected rotation angle of the setting bolt 183. Certain rotation angle information is output to the information processing unit 195. In addition, the signal processing unit 193c controls driving power and operation of the light emitting element 193a based on the amount of received light and the like in order to save power and stabilize operation.

  The center of the disk 194 is inserted into the rotation shaft 191 and rotates together with the rotation shaft 191. The disk 194 functions as a light receiving state changing unit that changes the light receiving state of the light receiving element 193b.

  The disk 194 changes the light receiving state of the light receiving element 193b by not transmitting the light from the light emitting element 193a. The disk 194 is a substantially cup-shaped member that includes a disk-shaped flat part, a side part provided on the outer periphery of the flat part, and a light transmitting part provided on the side part. As for the disk 194, a plane part and a side part are provided with light impermeability (light-shielding property). The light transmission part is provided in the side part in the shape of a slit at equal intervals, and transmits the light from the light emitting element 193a.

  The disk 194 is not limited to the transmission type having the light transmission part as described above. For example, the light from the light emitting element 193a may be refracted by a prism to change the light receiving state of the light receiving element 193b.

  FIG. 8 is a partial cross-sectional perspective view showing another example of the rotation angle detector 19 of the torque wrench 10. The disk 194A is not limited to a substantially cup shape having a flat surface portion and a side surface portion as described above, and may be, for example, a disk shape having a light transmitting portion in the flat surface portion. In this case, the encoder unit 193A is provided so as to sandwich the flat portion of the disk 194A.

  The information processing unit 195 calculates the rotation angle (number of rotations, amount of rotation) of the set bolt 183 based on the signal output from the signal processing unit 193c of the encoder unit 193. Further, the information processing unit 195 calculates a set torque value set in the torque value setting grip 185 based on the rotation angle of the set bolt 183. The information processing unit 195 pays attention to the fact that the compression force of the spring portion 181 varies depending on the rotation angle of the setting bolt 183, and calculates the set torque value of the torque value setting unit 18 based on the detected rotation angle of the setting bolt 183. To do.

  The information processing unit 195 stores information indicating the correlation between the rotation angle and the set torque value stored in the storage unit 197 (for example, a conversion formula or a data table for calculating the set torque value based on the rotation angle). Used to calculate and output the set torque value.

  Further, the information processing unit 195 calculates a tightening torque value when the tightening member is actually tightened, that is, an actual measurement value, based on the strain amount of the arm 122 acquired from the strain gauge 199. The information processing unit 195 stores information indicating the correlation between the strain amount and the tightening torque value stored in the storage unit 197 (for example, a conversion formula or a data table for calculating an actual measurement value based on the strain amount). Used to calculate and output the measured value. When the information processing unit 195 outputs the set torque value or the actual measurement value, the information processing unit 195 may output the information regarding the work date and time or the worker in association with the set torque value. The information processing unit 195 stores information related to these tightening operations in the storage unit 197 and the IC tag 187 in association with identification information as work information.

  The communication unit 196 manages information related to the tightening operation of the tightening member including any of the set torque value, the measured value data, and the rotation angle information output from the information processing unit 195, and manages the set torque value data. To an external device (information processing device) (not shown) such as a server that performs the processing. In the communication unit 196, the communication path by the communication unit 196 may be either wireless communication or wired communication. The type of communication format between the communication unit 196 and the external device is not limited, and for example, Bluetooth (registered trademark), infrared communication, WAN (Wide Area Network), LAN (Local Area Network), or the like can be used.

  The IC reader / writer 189 transmits / receives information including work information to / from an IC tag provided on the torque value setting grip 185. Details of the IC reader / writer 189 will be described later.

[Configuration of torque value setting grip and attachment / detachment mechanism]
Next, the configuration of the torque value setting grip 185 and its attaching / detaching mechanism will be described.

  FIG. 9 is a partial cross-sectional view showing the structure of the torque value setting grip 185 and the attaching / detaching mechanism 186 of the torque wrench 10. As shown in FIG. 9, the torque value setting grip 185 includes an attaching / detaching mechanism 186 and an IC tag 187.

  The torque wrench 10 includes the attaching / detaching mechanism 186, so that the torque value setting grip 185 can be detachably attached to the end of the torque wrench 10 opposite to the head portion 12.

  The attachment / detachment mechanism 186 includes an insertion shaft 186a, a cancel button 186b, a recess 186c, a ball 186d, a return spring 186e, and a grip receiving portion 188.

  The insertion shaft 186 a functions as a rotation shaft of the torque value setting grip 185. The insertion shaft 186 a is an axis that rotates together with the grip receiving portion 188 by being inserted into the grip receiving portion 188. A space is provided in the insertion shaft 186a.

  In the space of the insertion shaft 186a, a bottom surface is provided on the side (tip side) to be inserted into the grip receiving portion 188. The space on the insertion shaft 186a is opened on the opposite side of the bottom surface. A cancel button 186b and a return spring 186e are provided in the space of the insertion shaft 186a. A ball 186d is provided on the side surface (front end side) of the insertion shaft 186a that is inserted into the grip receiving portion 188.

  The cancel button 186b is inserted into the space of the insertion shaft 186a as described above. The cancel button 186b has a shape slightly smaller than the space of the insertion shaft 186a, so that it can move in the space. A substantially hemispherical recess 186c capable of accommodating the ball 186d is provided on the side surface on the distal end side of the cancel button 186b.

  The return spring 186e is provided on the bottom surface on the distal end side of the space of the insertion shaft 186a. The return spring 186e is a compression spring in which the longitudinal direction of the torque wrench 10 is the compression direction. For example, a coil spring can be used as the return spring 186e. The return spring 186e pushes back the cancel button 186b inserted into the space of the insertion shaft 186a.

  The ball 186d is provided on the side surface of the insertion shaft 186a. The ball 186d is engaged with the ball receiving groove 188a of the grip receiving portion 188 when the insertion shaft 186a is inserted into the grip receiving portion 188. The ball 186d is exposed to the outside through a hole 186f provided on the side surface of the insertion shaft 186a. The ball 186d is pushed out in the direction exposed from the hole 186f by the side surface of the cancel button 186b.

  The ball 186d fits into the recess 186c by pushing the cancel button 186b toward the arm 122. When fitted in the recess 186c, the ball 186d is drawn in the direction of the space of the insertion shaft 186a from the hole 186f, and the side surface of the insertion shaft 186a and the height of the ball 186d are substantially the same.

  The grip receiving unit 188 is provided at the other end of the rotating shaft 191 of the torque wrench 10. The grip receiving unit 188 is provided to connect the rotating shaft 191 and the torque value setting grip 185. The grip receiving portion 188 has a shape capable of receiving the insertion shaft 186a, specifically, a substantially cylindrical concave shape. The grip receiving portion 188 is provided with a ball receiving groove 188a that can receive the ball 186d.

  The IC tag 187 is provided at the tip of the insertion shaft 186 a of the torque value setting grip 185, for example, the attachment / detachment mechanism 186. The IC tag 187 corresponds to an electronic storage medium. The IC tag 187 stores various information related to the tightening operation and the torque wrench 10. The information includes, for example, identification information uniquely given to the torque value setting grip 185, a set torque value calculated by the information processing unit 195 based on the rotation angle information detected by the rotation angle detection unit 19, or a distortion The actual value of the tightening torque calculated by the information processing unit 195 based on the strain amount detected by the gauge 199 is included. The information processing unit 195 stores information related to these tightening operations in the IC tag 187 in association with the identification information as operation information.

  The IC reader / writer 189 is provided at a position where information can be transmitted to and received from the IC tag 187 when the torque value setting grip 185 is attached to the torque wrench 10. Specifically, the IC reader / writer 189 is provided, for example, in the concave shape of the grip receiving unit 188. The IC reader / writer 189 transmits / receives the transmitted / received information to / from the information processing unit 195. That is, the IC reader / writer 189 constitutes a part of the function of the information processing unit.

  When the process of transmitting and receiving information between the IC tag 187 and the IC reader / writer 189 can be executed, the information processing unit 195 determines that the torque value setting grip 185 is attached to the grip receiving unit 188. That is, the information processing unit 195 determines that the set torque value can be set in the torque value setting unit 18 of the torque wrench 10.

  On the other hand, when the process of transmitting and receiving information between the IC tag 187 and the IC reader / writer 189 cannot be executed, the information processing unit 195 determines that the torque value setting grip 185 is not attached to the grip receiving unit 188. to decide. That is, the information processing unit 195 determines that the setting torque value cannot be set in the torque value setting unit 18.

[Torque value setting grip operation]
Next, the structure of the receiving part of the torque value setting grip 185 and the torque value setting grip 185 will be described.

  FIG. 10 is a partial cross-sectional view showing a state where the torque value setting grip 185 is attached to the grip receiving portion 188 in the torque wrench 10. As shown in FIG. 10, when the torque value setting grip 185 is attached to the grip receiving portion 188, the ball 186d of the attachment / detachment mechanism 186 protrudes from the hole 186f on the side surface of the insertion shaft 186a. At this time, the ball 186d is pushed out of the hole 186f by the side surface of the cancel button 186b. The ball 186d protruding from the hole 186f engages with the ball receiving groove 188a of the grip receiving portion 188. When the ball 186d is engaged with the ball receiving groove 188a, the torque value setting grip 185 can rotate the setting bolt 183 which is a component of the torque value setting unit of the torque wrench 10.

  In a state where the torque value setting grip 185 is attached to the grip receiving unit 188, the IC tag 187 provided in the torque value setting grip 185 is connected to the torque value setting grip via the IC reader / writer 189 provided in the grip receiving unit 188. Various information such as information unique to the worker who uses the 185 and the date and time when the torque value setting grip 185 is attached can be communicated.

  FIG. 11 is a partial cross-sectional view showing a state where the torque value setting grip 185 is detached from the grip receiving portion 188 in the torque wrench 10. As shown in FIG. 11, in order to detach the grip receiving portion 188 from the torque value setting grip 185, the cancel button 186b is pushed, and the ball 186d of the attaching / detaching mechanism 186 is moved from the side surface of the cancel button 186b to the recess 186c. The ball 186d moves to the recess 186c and is drawn into the space from the hole 186f on the side surface of the insertion shaft 186a. When the ball 186d is drawn through the hole 186f, the grip receiving portion 188 and the ball receiving groove 188a are disengaged from each other, and the torque value setting grip 185 is detached from the grip receiving portion 188. When the torque value setting grip 185 is detached, the torque wrench 10 cannot rotate the setting bolt 183.

[Mode judgment processing]
Next, the mode determination process by the information processing unit 195 of the torque wrench 10 will be described.

  FIG. 12 is a flowchart showing mode determination processing by the information processing unit 195 of the torque wrench 10. The information processing unit 195 communicates with the IC tag 187 via the IC reader / writer 189 and detects that the torque value setting grip 185 is attached to the grip receiving unit 188 (S101).

  The information processing unit 195 detects that the operator has set the set torque value of the torque wrench 10 by operating the torque value setting grip 185 using the rotation angle detection unit 19 (S102).

  After setting the set torque value, the information processing unit 195 determines whether the torque value setting grip 185 has been detached from the grip receiving unit 188 depending on whether communication between the IC reader / writer 189 and the IC tag 187 is possible. It is determined whether or not (S103).

  When communication between the IC reader / writer 189 and the IC tag 187 is not possible, the information processing unit 195 determines that the torque value setting grip 185 has detached from the grip receiving unit 188 (S103: YES). In this case, the information processing unit 195 determines that the torque wrench 10 is in the pre-lock mode in which the operator functions as a pre-lock type torque wrench that cannot change the set torque value (S104).

  On the other hand, when the communication between the IC reader / writer 189 and the IC tag 187 is possible, the information processing unit 195 determines that the torque value setting grip 185 is attached to the grip receiving unit 188 (S103: NO). In this case, the information processing unit 195 determines that the torque wrench 10 is in a preset mode in which the torque wrench 10 functions as a preset torque wrench that can change a set torque value that can be measured by an operator's operation (S105).

  The information processing unit 195 records each mode determined in the processing of S104 and S105 in the storage unit 197 (S106).

  FIG. 13 is a schematic diagram showing the display unit 20 of the torque wrench 10. As illustrated in FIG. 13, the information processing unit 195 controls the display unit 20 of the torque wrench 10 to display the characters “PRESET” on the preset display unit 21 when the recorded mode is the preset mode. . Further, when the recorded mode is the pre-lock mode, the information processing unit 195 controls the display unit 20 of the torque wrench 10 to display the characters “PRERELCK” on the pre-lock display unit 23.

  When the operator performs a tightening operation using the torque wrench 10, the strain of the arm 122 is detected by the strain gauge 199. The information processing unit 195 measures the actual value of the tightening torque value based on the detected strain amount (S107).

  The information processing unit 195 stores the actual measured value of the tightening torque value in the storage unit 197 (S108).

  In the torque wrench 10 described above, the torque value setting grip 185 for setting the torque value by the attaching / detaching mechanism 186 is attachable / detachable. In the torque wrench 10, an IC tag 187 is provided on the torque value setting grip 185, and an IC reader / writer 189 is provided on the main body side of the torque wrench 10.

  In the torque wrench 10 as described above, the information processing unit 195 determines whether the torque value setting grip 185 is attached or detached by the IC tag 187 and the IC reader / writer 189, that is, whether or not the setting torque value of the torque wrench 10 can be set is specified. Can do. For this reason, according to the torque wrench 10, it is possible to specify an operator who has set a set torque value for each torque wrench, and to prevent the set torque value from being easily changed.

  Therefore, according to the torque wrench 10, work manageability in the tightening work can be improved.

DESCRIPTION OF SYMBOLS 10 Torque wrench 11 Case 12 Head part 13 Head pin 14 Gain adjustment screw 15 Link 16 Slider 17 Spring guide 18 Torque value setting part 19 Rotation angle detection part 20 Display part 21 Preset display part 23 Pre-lock display part 121 Ratchet head 122 Arm 123 Contact part 124 Socket connection portion 181 Spring portion 182 Torque value display portion 183 Setting bolt 184 Lock nut 185 Torque value setting grip 186 Detachment mechanism 186a Insertion shaft 186b Cancel button 186c Recess 186d Ball 186e Return spring 186f Hole 187 Tag 188 Grip receiving portion 188a Ball Receiving groove 189 IC reader / writer 191 Rotating shaft 192 Substrate 193 Encoder unit 193a Light emitting element 193A Encoder unit 193b Light receiving element 19 c signal processor 194 disc 194A disk 195 the information processing unit 196 communication unit 197 storage unit 198 housing 199 strain gauge

Claims (5)

A tightening tool for perceiving that a tightening torque generated when tightening a tightening member by an operator's operation has reached a preset torque value,
A torque value setting unit capable of setting the set torque value to a predetermined value by rotating operation;
An operation unit that is detachably attached to the torque value setting unit, and that allows the torque value setting unit to be operated when mounted;
An electronic storage medium that is provided in the operation unit and stores information including identification information uniquely given to the operation unit;
An attachment / detachment mechanism that makes the operation part and the torque value setting part attachable / detachable;
An information processing unit that performs a process of transmitting and receiving information to and from the electronic storage medium when the operation unit is attached to the attachment / detachment mechanism;
Comprising
Tightening tool. The information processing unit
When the process of transmitting and receiving the information to and from the electronic storage medium can be executed, it is determined that the setting torque value can be set in the torque value setting unit,
When the process of transmitting and receiving the information to and from the electronic storage medium cannot be executed, it is determined that the setting torque value cannot be set in the torque value setting unit.
The fastening tool according to claim 1. A rotation angle detection unit that detects a rotation angle of the torque value setting unit and outputs rotation angle information based on the detected rotation angle;
With
The information processing unit calculates the set torque value set in the torque value setting unit based on the rotation angle information, and stores the calculated set torque value in the electronic storage medium as the information;
The tightening tool according to claim 1 or 2. A strain gauge that electrically detects the amount of strain generated in the tightening tool when the tightening member is tightened;
With
The information processing unit calculates an actual value of a tightening torque when the tightening member is tightened based on a strain amount detected by the strain gauge, and the calculated actual value is stored in the electronic storage medium as the information. Remember,
The tightening tool according to any one of claims 1 to 3. A communication unit for communicating the information with an external device;
The tightening tool according to any one of claims 1 to 4.