JP2018103300A - Torque value setting system for fastening tool and torque value setting device for fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain measurement accuracy of a mechanical preset-type torque wrench.SOLUTION: A torque value setting system comprises: a fastening tool capable of determining whether a fastening toque applied when fastening a member to be fastened is a predetermined fastening torque value; and a torque value setting device for setting a fastening torque value to the fastening tool. The fastening tool comprises: a torque value setting part allowing the fastening torque to set to an arbitrary value. The torque value setting device comprises: an origin point setting part for setting the fastening torque value to an origin point position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a torque value setting system for a tightening tool and a torque value setting device for a tightening tool.

  Conventionally, a torque wrench is known as a tightening tool capable of managing the tightening torque by measuring the tightening torque when tightening a tightening member such as a bolt or a nut at a tightening location. In general, there are two types of torque wrench: a single-function type torque wrench that cannot change the numerical value of the tightening torque to be measured, and a preset type torque wrench that can change the value of the tightening torque that can be measured by an operator's operation.

  In the mechanical preset torque wrench, when the tightening member is tightened, when the tightening torque reaches a set value, the compression force from the spring acts in the direction in which the toggle rotates around the connecting portion. . As the toggle rotates about the connecting portion, the toggle slides relative to the head portion. In the torque wrench, when the toggle slides with respect to the head portion and comes into contact with another part such as a case, sound and vibration are generated from the torque wrench. The operator can confirm that the tightening torque value of the tightening member is greater than or equal to the set value by sound or vibration generated from the torque wrench.

  In addition, in a tightening torque management technique for a tightening location using a torque wrench, a technology is disclosed in which a specified value of the tightening torque at a specified tightening location is sent from a computer to a torque wrench (for example, Patent Document 1). reference). In this technique, based on the specified value sent to the torque wrench, the operator adjusts the tightening torque of the torque wrench to be within the specified value range, and then tightens the tightening member.

JP 2013-151043 A

  By the way, in order to maintain the measurement accuracy, the mechanical preset torque wrench unloads the compression force applied to the spring at the time of storage as much as possible (for example, to the origin position of the setting range of the tightening torque value). Is desirable.

  However, in a conventional mechanical preset torque wrench, it is necessary for an operator or the like to set a tightening torque. That is, in the conventional preset torque wrench, the operator has to set the tightening torque value at the origin position.

  An object of the present invention is to maintain the measurement accuracy of a mechanical preset torque wrench.

  The present invention relates to a tightening tool capable of measuring that a tightening torque when tightening a tightening member is a predetermined tightening torque value, and a torque value setting for setting the tightening torque value in the tightening tool. A torque value setting system, wherein the tightening tool includes a torque value setting unit capable of setting the tightening torque value to an arbitrary value, and the torque value setting device tightens the torque value setting unit. An origin setting unit for setting the torque value to the origin position.

  In the present invention, the origin setting unit may include a connection unit connected to the torque value setting unit, a drive unit that drives the connection unit, and a control unit that controls the drive unit.

  Further, according to the present invention, the origin setting unit can set a tightening torque value by a turning operation, the drive unit is a motor that rotates the torque value setting unit, and the connection unit is a torque value setting unit. The engaging part which engages with the to-be-engaged part provided may be sufficient.

  In the present invention, the tightening tool may include a lock unit that locks the torque value setting unit, and the torque value setting device may include a lock operation unit that operates the lock unit.

  According to the present invention, the measurement accuracy of a mechanical preset torque wrench can be maintained.

It is a schematic diagram of a torque value setting system showing an embodiment according to the present invention. It is a fragmentary sectional view which shows an example of the torque wrench by which a torque value is set by the torque value setting system shown in FIG. It is a bottom view which shows the vicinity of the torque value setting part of the torque wrench shown in FIG. It is a schematic diagram which shows an example of the connection part of the torque value setting apparatus in the torque value setting system shown in FIG. It is a schematic diagram which shows another example of the connection part of the torque value setting apparatus in the torque value setting system shown in FIG. It is a flowchart which shows an example of the torque value setting method which a torque value setting system performs.

  Hereinafter, embodiments of a torque value setting system and a torque value setting device for a tightening tool according to the present invention will be described with reference to the drawings. In the following description, an example in which the torque value setting device sets a torque value in a torque wrench that is an example of a tightening tool including a torque value setting unit will be described.

  FIG. 1 is a schematic diagram of a torque value setting system 1 showing an embodiment according to the present invention.

[Configuration of torque wrench torque value setting system]
A configuration of the torque value setting system 1 will be described.

  As shown in FIG. 1, the torque value setting system 1 includes a torque wrench 10 and a torque value setting device 20.

  The torque wrench 10 is an example of a tightening tool for tightening a tightening member such as a bolt or a nut to a predetermined tightening location. The torque wrench 10 can measure that the tightening torque when tightening the tightening member is a predetermined tightening torque (hereinafter referred to as “tightening torque value”).

  The torque value setting device 20 is a device that sets a tightening torque value for a tightening tool such as the torque wrench 10.

[Configuration of torque wrench]
FIG. 2 is a partial cross-sectional view showing an example of a torque wrench 10 whose tightening torque value is set by the torque value setting system 1 shown in FIG.

  The torque wrench 10 is a so-called mechanical preset torque wrench. The torque wrench 10 includes a case 11, a head part 12, a head pin 13, a toggle 14, a connection part 15, a holding part 16, a spring 17, a torque value setting part 18, and a setting position detection part 19. Prepare.

  The case 11 is a substantially cylindrical member that houses the components of the torque wrench 10 such as the head portion 12 and the toggle 14 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 grip portion 11b for the operator to hold at the other end.

  The head portion 12 includes a ratchet head 12a, an arm portion 12b, and a link 12c. 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 12a and the arm portion 12b.

  The ratchet head 12 a is exposed from the case 11. A socket wrench (not shown) that engages with a fastening member (for bolt or nut fastening) can be detachably attached to the ratchet head 12a. The arm portion 12b is housed inside the case 11. The arm portion 12 b can swing inside the case 11 around the head pin 13. A link 12c connected to the toggle 14 is provided at the tip of the arm portion 12b.

  The toggle 14 is a substantially rectangular plate member. The toggle 14 has one end connected to the link 12 c of the head unit 12 and the other end connected to the holding unit 16 via the connection unit 15. The toggle 14 is pivotally supported inside the case 11 by a link 12c.

  The holding part 16 is a substantially cylindrical member. The holding part 16 is disposed inside the case 11 so that a direction perpendicular to the axial direction (longitudinal direction) of the torque wrench 10 is a plane. The other end of the toggle 14 is slidably connected to one side of the holding part 16 via the connection part 15. The holding portion 16 has one of the springs 17 in contact with the other flat surface.

  The spring 17 is provided at a position near the grip portion 11 b inside the case 11. The spring 17 is a compression spring in which the longitudinal direction of the torque wrench 10 is the compression direction. As the spring 17, for example, a coil spring can be used.

  The torque value setting part 18 is provided at the tip of the grip part 11b of the case 11, for example. The torque value setting unit 18 includes a setting bolt 18a, a stopper 18b, a head portion 18c, a lock portion 18d, and a spring support portion 18e.

  FIG. 3 is a bottom view showing the vicinity of the torque value setting unit 18 of the torque wrench 10. As shown in FIG. 3, the setting bolt 18a passes through a hole provided in the stopper 18b, and only the head 18c is exposed to the outside of the stopper 18b. The setting bolt 18 a has a shaft body housed inside the case 11. Engaged parts such as gears and hexagonal holes are formed on the head 18c, and the setting bolt 18a is rotated by engaging with engaging parts such as gears and hexagonal wrench provided on the torque value setting device 20. Can be moved.

  The setting bolt 18a has a male thread cut at least partially. The setting bolt 18a is screwed into a female screw provided on the spring support 18e. The stopper 18b regulates the amount of movement of the setting bolt 18a by contacting the head 18c.

  The spring support portion 18 e is in contact with the spring 17 at a contact surface provided inside the case 11. The spring support portion 18 e compresses the spring 17 in the direction of the holding portion 16. The torque value setting unit 18 rotates the head 18c, thereby moving the position of the spring support 18e with which the setting bolt 18a is screwed, and changing the pressing force of the spring 17 against the holding unit 16. it can. The torque value setting unit 18 adjusts the degree of compression of the spring 17 by rotating the setting bolt 18a, and sets a tightening torque value to a predetermined value (for example, a prescribed value determined for each tightening member at the tightening point). (Tightening torque value) can be set (see FIGS. 4 and 5).

  Returning to FIG. 2, the lock portion 18 d is provided at the upper end (end portion near the head portion 12) of the grip portion 11 b of the case 11. The lock portion 18d prevents the torque value setting portion 18 from changing the tightening torque value even if the setting bolt 18a is rotated. The lock portion 18d is, for example, a ring-shaped member provided coaxially with the grip portion 11b, and can change a relative position with respect to the case 11 along the longitudinal direction of the torque wrench 10.

  The set position detection unit 19 is provided at a position where the position of the set bolt 18a inside the case 11 can be detected, for example. The set position detector 19 is a sensor that detects the position of the set bolt 18a and the head 18c. The setting position detection unit 19 includes, for example, a camera that detects the positions of the setting bolt 18a and the head 18c from an image, a combination of a light emitting unit such as infrared rays, and a light receiving element (photodiode). The setting position detection unit 19 transmits information such as the detected position of the setting bolt 18a and the head 18c to the control unit 23 of the torque value setting device 20 wirelessly or by wire.

[Torque wrench operation]
The operation of the torque wrench 10 described above will be described.

  In the torque wrench 10, when the tightening member is tightened, when the tightening torque reaches the set value set by the torque value setting unit 18, the toggle force 14 rotates around the link 12c by the compression force from the spring 17. Work in the direction. The toggle 14 slides with respect to the head portion 12 as the toggle 14 rotates about the link 12c. In the torque wrench 10, sound and vibration are generated from the torque wrench 10 when the toggle 14 slides with respect to the head portion 12 and comes into contact with other parts such as the case 11.

  In the torque wrench 10, the operator can recognize that the tightening torque has reached the set value by the sound and vibration generated by the toggle 14 sliding with respect to the head portion 12.

[Configuration of torque value setting device]
Next, the configuration of the torque value setting device 20 of the torque value setting system 1 will be described.

  As shown in FIG. 1, the torque value setting device 20 includes a connection unit 21, a drive unit 22, a control unit 23, a communication unit 24, and a housing 25.

  The connection unit 21 is provided at a position where the torque value setting unit 18 can be operated with the torque wrench 10 attached to the torque value setting device 20. The connection unit 21 is connected to the torque value setting unit 18 of the torque wrench 10 attached to the torque value setting device 20.

  FIG. 4 is a schematic diagram illustrating an example of the connection portion 21 of the torque value setting device 20. FIG. 5 is a schematic diagram showing another example of the connecting portion 21 of the torque value setting device 20 shown in FIG.

  As shown in FIGS. 4 and 5, specifically, the connection portion 21 is provided, for example, in the housing portion 25 a of the housing 25. The accommodating portion 25 a can accommodate the grip portion 11 b of the torque wrench 10. The connecting portion 21 is an engaging portion such as a gear shown in FIG. 4 or a hexagon wrench shown in FIG. 5 that can be engaged with an engaged portion such as a gear of the head 18c of the torque value setting portion 18 or a hexagonal hole. is there. Since the engaging portion is engageable with the engaged portion of the head 18 c of the torque wrench 10, the connecting portion 21 can be connected to the torque value setting portion 18.

  The drive unit 22 is an actuator capable of controlling the drive amount, such as a servo motor or a solenoid. The drive unit 22 operates the connection unit 21 with a drive amount based on control by the control unit 23.

  The control unit 23 operates the torque value setting unit 18 via the connection unit 21 by controlling the drive amount of the drive unit 22. For example, the control unit 23 sets the tightening torque to an arbitrary set value, such as an origin position of the tightening torque value (an arbitrary initial value or a limit position of the setting range of the torque value setting unit 18). That is, the control unit 23 functions as an origin setting unit together with the connection unit 21 and the drive unit 22. The control unit 23 operates the torque value setting unit 18 based on the position information of the setting bolt 18 a and the head 18 c transmitted from the setting position detection unit 19 of the torque wrench 10, thereby adjusting the tightening torque of the torque wrench 10. Set to the set value.

  The communication unit (communication module) 24 communicates information on the tightening torque value corresponding to the tightening position of the tightening member with the information processing apparatus 30 such as a smartphone, a tablet terminal, or a personal computer. The communication unit 24 receives the transmitted position information of the setting bolt 18 a and the head 18 c from the setting position detection unit 19 of the torque wrench 10. The communication path by the communication unit 24 may be either wireless communication or wired communication. The type of communication format between the communication unit 24 and the information processing apparatus 30 is not limited. For example, Bluetooth (registered trademark), infrared communication, USB (Universal Serial Bus), WAN (Wide Area Network), LAN (Local Area Network). ) Etc. can be used.

  As described above, the torque value setting device 20 sets the tightening torque value in the control unit 23 through communication between the communication unit 24 and the information processing device 30 as described above. A set value may be input.

  In addition, when the torque wrench 10 includes the lock unit 18d that locks the torque value setting unit 18, the torque value setting device 20 may include a lock operation unit that releases the lock unit 18d. The lock operation unit operates the lock unit 18 d of the torque wrench 10 set in the torque value setting device 20 to switch whether to accept the torque value setting operation to the torque value setting unit 18.

  Further, the torque value setting device 20 may include a setting position detection unit 19 provided in the torque wrench 10 in the vicinity of the driving unit 22. When provided in the torque value setting device 20, the setting position detection unit 19 is a camera, for example, and detects the position of the setting bolt 18 a or the like from the captured image.

[Operation of torque value setting device]
Next, a torque value setting method of the torque wrench 10 realized by the operation of the torque value setting device 20 in the torque value setting system 1 will be described using a flowchart.

  FIG. 6 is a flowchart illustrating an example of a torque value setting method executed by the torque value setting system 1.

  When the operator sets the torque wrench 10 in the accommodating portion 25a of the torque value setting device 20, the control unit 23 determines the model of the torque wrench 10 for setting the tightening torque value by the torque value setting device 20 (S101). ).

  By determining the model, the control unit 23 sets a tightening torque range (for example, 20 to 100 N · m, 40 to 200 N · m) that can be set by the torque wrench 10 that is different for each model (S102).

  When the tightening torque value is transmitted from the information processing device 30 to the communication unit 24 of the torque value setting device 20, the tightening torque value is input to the memory unit of the control unit 23 (S103). The input of the tightening torque may be received from an input unit (not shown) provided in the torque value setting device 20.

  The control unit (control board) 23 sets the drive amount of the drive unit 22 necessary for setting the tightening torque value in the torque value setting unit 18 based on the information of the tightening torque value range determined in S102. A calculation step for calculation is executed (S104).

  After execution of the calculation process, the torque value setting device 20 receives an operation for starting the setting of the tightening torque value to the torque value setting unit 18 of the torque wrench 10 (S105). The control unit 23 performs a process of releasing the lock state of the lock unit 18d of the setting bolt 18a of the torque value setting unit 18 of the torque wrench 10 (S106).

  After releasing the lock state, the control unit 23 performs a process of adjusting the set value to the origin position before setting the set value (S107). The origin position adjustment process is a calibration process for accurately setting the set value of the torque wrench 10.

  After adjusting the set value to the origin position, the control unit 23 sets a tightening torque value in the torque value setting unit 18 as a tightening torque setting step (S108). In order to set the tightening torque value, the control unit 23 drives the drive unit 22 with the previously calculated drive amount, and drives the torque value setting unit 18 from the origin position to a position corresponding to the tightening torque value.

  After the setting of the torque value by the drive unit 22 is completed, the control unit 23 locks the lock unit 18d of the setting bolt 18a of the torque value setting unit 18 of the torque wrench 10 (S109).

  As described above, according to the torque value setting system 1 of the torque wrench 10, the tightening torque value of the torque wrench 10 can be set by the torque value setting device 20. Here, the torque value setting system 1 operates the torque value setting unit 18 of the torque wrench 10 with the connection unit 21 to set the tightening torque value set in the torque value setting unit 18 to an arbitrary value including the origin position. Can be set to position. That is, according to the torque value setting system 1, an operator or the like can set a predetermined specified torque value without operating the torque value setting unit 18.

  Therefore, according to the torque value setting system 1, it is not necessary for an operator or the like to operate the torque value setting unit 18, and the state of the torque value setting unit 18 can be reliably returned to the origin position.

  Therefore, according to the torque value setting system 1, the measurement accuracy of the mechanical preset torque wrench can be maintained.

  It should be noted that the above description is intended to be illustrative only and not limiting. Accordingly, it will be apparent to one skilled in the art that modifications may be made to the above-described form without departing from the scope of the appended claims.

  For example, in the present embodiment, the torque wrench 10 is shown as a tightening tool, but the tightening tool according to the present invention is not limited thereto, and the tightening torque is measured when a screw is tightened as a tightening member. It can also be applied to so-called torque drivers.

  Further, in the present embodiment, as shown in FIGS. 4 and 5, the gear and the hexagon socket are shown as the shape of the engaged portion, and the gear and the hexagon wrench are shown as the shape of the engaging portion. The shapes of the engaged portion and the engaging portion according to the above are not limited to this. The shapes of the engaged portion and the engaging portion may be, for example, shapes such as a Phillips screw and a Phillips screwdriver.

DESCRIPTION OF SYMBOLS 1 Torque value setting system 10 Torque wrench 11 Case 11b Grip part 12 Head part 12a Ratchet head 12b Arm part 12c Link 13 Head pin 14 Toggle 15 Connection part 16 Holding part 17 Spring 18 Torque value setting part 18a Setting bolt 18b Stopper 18c Head 18d Lock unit 19 Setting position detection unit 20 Torque value setting device 21 Connection unit 22 Drive unit 23 Control unit 24 Communication unit 25 Housing 25a Housing unit 26 Lock operation unit 30 Information processing device

Claims (5)

A tightening tool capable of measuring that the tightening torque when tightening the tightening member is a predetermined tightening torque value;
A torque value setting device for setting the tightening torque value in the tightening tool;
A torque value setting system comprising:
The tightening tool is
A torque value setting unit capable of setting the tightening torque value to an arbitrary value;
With
The torque value setting device includes:
An origin setting unit for setting the tightening torque value of the torque value setting unit to an origin position;
Comprising
Tightening tool torque value setting system. The origin setting unit is
A connecting portion connected to the torque value setting portion;
A drive unit for driving the connection unit;
A control unit for controlling the driving unit;
Comprising
The torque value setting system for a tightening tool according to claim 1. The origin setting unit can set the tightening torque value by a turning operation.
The drive unit is a motor that rotates the torque value setting unit,
The connecting portion is an engaging portion that engages with an engaged portion provided in the torque value setting portion.
The torque value setting system for a tightening tool according to claim 2. The tightening tool includes a lock portion that locks the torque value setting portion,
The torque value setting device includes a lock operation unit that operates the lock unit.
The torque value setting system for a tightening tool according to any one of claims 1 to 3. The torque value setting unit capable of setting the tightening torque value of the tightening tool capable of measuring that the tightening torque when tightening the tightening member is a predetermined tightening torque value to the arbitrary value. A torque value setting device for setting a tightening torque value,
An origin setting unit for setting the tightening torque value of the torque value setting unit to an origin position;
Comprising
Torque value setting device for tightening tools.