Nut wrench device

Abstract

The present invention relates to a nut wrench device, comprising: a main body, wherein the main body has a main shaft and a supporting part, wherein the supporting part supports the main shaft so as to be rotatable around a long side axis; an assembly and disassembly unit, wherein the assembly and disassembly unit is connected to the front end of the main body in a removable manner and has a wrench, wherein the wrench is configured to be coaxial with the main shaft and rotatable integrally with the main shaft; and an air passage, wherein the air passage extends in the direction along the long side axis inside the main shaft and the assembly and disassembly unit, and connects an exhaust port provided on the main shaft and an intake port opened on the front end surface of the assembly and disassembly unit, wherein the front end portion of the wrench is configured in the intake port, and air sucked from the intake port to the exhaust port via the air passage passes through the front end portion of the wrench and the side surface of a fastening member engaged with the front end of the wrench.

Description

Technical Field

[0001] The invention relates to a nut spanner device. Background Art

[0002] Conventionally, there is known an automatic bolt tightening device that is mounted on a movable body such as a robot and is used to tighten a tightening member such as a nut or a bolt to a member to be tightened (for example, refer to Patent Document 1).

[0003] The automatic bolt tightening device of Patent Document 1 is configured to be able to install or remove an assembly on the main body of the tightening device, and the assembly includes an adsorption member that adsorbs and holds the bolt, and a drill that engages with the head of the bolt. The automatic bolt tightening device can handle a variety of bolts with different head sizes by replacing the assembly. In addition, the automatic bolt tightening device of Patent Document 1 holds the bolt by vacuum adsorption. Vacuum adsorption can hold the tightening member without magnetizing it, and is therefore suitable for holding a tightening member that cannot be magnetized.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 5-337752 Summary of the invention

[0007] Problems to be solved by the invention

[0008] When the fastening member is held by vacuum adsorption, sealing members such as O-rings need to be provided at various locations of the device in order to maintain the airtightness of the air passage. Therefore, the structure of the device becomes complicated and the cost of the device increases. In addition, it is difficult to stably maintain high airtightness, and a slight gap may cause the vacuum degree of the passage to drop sharply, thereby causing the adsorption force of the fastening member to drop sharply.

[0009] Solutions for solving problems

[0010] One aspect of the present application is a nut wrench device, comprising: a main body, the main body having a main shaft and a supporting part, the supporting part supporting the main shaft so as to be rotatable around the long side axis of the main shaft; an assembly and disassembly unit, the assembly and disassembly unit being connected to the front end of the main body in a removable manner, wherein the assembly and disassembly unit has a wrench, the wrench is configured to be coaxial with the main shaft and can rotate integrally with the main shaft; and an air channel, the air channel extending in the direction along the long side axis inside the main shaft and the assembly and disassembly unit, and connecting an exhaust port provided on the main shaft and an intake port opening at the front end surface of the assembly and disassembly unit, the front end portion of the wrench being configured in the intake port, and the air sucked from the intake port to the exhaust port via the air channel passes through the front end portion of the wrench and the side surface of the fastening member embedded in the front end of the wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an external view showing the structure of a nut runner device according to one embodiment.

[0012] Figure 2 for Figure 1 A partial enlarged view of the nut wrench device.

[0013] Figure 3 for Figure 1 A partial longitudinal section view of a nut wrench device.

[0014] Figure 4 It is a three-dimensional view of the first shell of the assembly and disassembly unit.

[0015] Figure 5 It is a three-dimensional view of the second shell of the assembly and disassembly unit.

[0016] Figure 6 It is a diagram showing the structure of the connection mechanism and is a diagram for explaining removal of the attachment and detachment unit from the main body.

[0017] Figure 7 This is a diagram showing the structure of the connection mechanism and is a diagram for explaining the connection between the attachment and detachment unit and the main body. DETAILED DESCRIPTION

[0018] Hereinafter, a nut runner device 100 according to one embodiment will be described with reference to the drawings.

[0019] The nut runner device 100 is used to fasten a fastening member S such as a nut or a bolt to a workpiece waiting for a fastening member. The nut runner device 100 is mounted on a movable part that can move, and moves by moving the movable part. In this embodiment, the movable part is a robot arm of an industrial robot such as a vertical multi-jointed robot, and the nut runner device 100 is mounted on the front end of the robot arm as a tool. The movable part may also be an industrial machine other than the robot arm.

[0020] like Figure 1 As shown, the nut runner device 100 includes: a main body 1, which has a spindle 3 and a motor (not shown); and a mounting and disassembly unit 2, which is removably connected to the front end of the main body 1. The mounting and disassembly unit 2 has a wrench 4, which is configured to be coaxial with the spindle 3 and to be engaged with the fastening member S (refer to Figure 3 ), the wrench 4 is connected to the main body 1 through a connecting mechanism 30 described later so as to rotate integrally with the main shaft 3.

[0021] Figure 2 is an enlarged view of the front end of the nut runner device 100, Figure 3 1 is a longitudinal sectional view of the front end portion of the nut runner device 100 along the longitudinal axis A of the spindle 3 .

[0022] The main shaft 3 has a driving shaft 3a and a cylindrical joint portion 3b, and the joint portion 3b is coaxially arranged with the driving shaft 3a at the front end of the driving shaft 3a. Figure 3 As shown, the front end of the drive shaft 3a is received in the base end of the joint 3b and fixed to the base end of the joint 3b. A motor received in the motor box 7 is connected to the base end of the drive shaft 3a, and the main shaft 3 is rotated around the long side axis A by the motor.

[0023] The joint 3b is a portion for connecting the main body 1 and the mounting and detaching unit 2, and is a portion for setting a part of the air passage 20 described later on the main shaft 3. The joint 3b has a larger diameter than the front end of the drive shaft 3a, and has an annular base end surface arranged radially outside the drive shaft 3a.

[0024] The main body 1 includes a support portion 6 that supports the main shaft 3 so as to be rotatable about the longitudinal axis A.

[0025] The supporting portion 6 has a box-shaped frame 8 and a cylindrical air connecting portion 9, which is arranged between the frame 8 and the joint 3b and is coaxial with the long side axis A, and the air connecting portion 9 is fixed to the front end of the frame 8, and the driving shaft 3a passes through the frame 8 and the air connecting portion 9.

[0026] The robot mounting part 11 is fixed to the frame 8 via a plate-like connecting member 10 and is used to mount the nut runner device 100 to the front end of the robot arm. For example, the robot mounting part 11 has a mounting hole 11a into which the front end of the robot arm is fitted.

[0027] like Figure 3 As shown, the air connection part 9 is arranged around the driving shaft 3a, and a space 21 is formed between the air connection part 9 and the driving shaft 3a, which is adjacent to the base end surface of the joint part 3b and is a part of the air passage 20. The driving shaft 3a passes through the opening 9a at the base end of the air connection part 9, and the base end of the joint part 3b is accommodated in the opening 9b at the front end of the air connection part 9. The space 21 is a circular or cylindrical space between the outer peripheral surface of the driving shaft 3a and the inner peripheral surface of the air connection part 9, which is continuous around the long side axis A.

[0028] The detachable unit 2 accommodates the wrench 4 therein and has a housing 12 connected to the joint 3b via a connection mechanism 30 described later. When the detachable unit 2 is connected to the body 1, the entire detachable unit 2 rotates integrally with the spindle 3.

[0029] The wrench 4 is a tube wrench or a hexagonal wrench, etc., and the front end of the wrench 4 has a shape and size corresponding to the type and size of the head of the fastening member S. In this embodiment, a plurality of mounting and disassembly units 2 are prepared, and the plurality of mounting and disassembly units 2 have wrenches 4 with different shapes and sizes of the front ends. The plurality of mounting and disassembly units 2 have a common structure except for the wrench 4, and are connected to a common main body 1.

[0030] When the detachable unit 2 is connected to the body 1 , the housing 12 has a central axis B that coincides with an extension of the longitudinal axis A. The wrench 4 is disposed coaxially with the central axis B of the housing 12 , and the front end of the wrench 4 is disposed at or near the front end of the housing 12 .

[0031] Specifically, the housing 12 includes a first housing 13 connected to the joint portion 3 b , and a second housing 14 disposed on the front end side of the first housing 13 and fixed to the first housing 13 .

[0032] like Figure 4 As shown in FIG. 1 , the first housing 13 is a cylindrical member arranged coaxially with the central axis B, and the base end of the wrench 4 is fixed to the first housing 13. Figure 5 As shown, the second housing 14 is a cylindrical member that is coaxially arranged with the central axis B and is open at both ends. For example, the housings 13 and 14 are fixed to each other by screwing the front end of the first housing 13 into the inside of the base end of the housing 14 .

[0033] The second housing 14 has a large diameter portion 14a and a small diameter portion 14b, the small diameter portion 14b is arranged at the front end side of the large diameter portion 14a and has an outer diameter smaller than the outer diameter of the large diameter portion 14a, and the front end portion of the wrench 4 is arranged inside the small diameter portion 14b. The inner diameters of the large diameter portion 14a and the small diameter portion 14b are larger than the outer diameter of the wrench 4, and a cylindrical space constituting a part of the air passage 20 described later is formed between the inner peripheral surfaces of the large diameter portion 14a and the small diameter portion 14b and the outer peripheral surface of the wrench 4. In addition, a space having a larger capacity than the cross-sectional area of ​​the small diameter portion 14b is formed inside the large diameter portion 14a.

[0034] In addition, if Figure 3 As shown, the nut wrench device 100 has an air passage 20 when the assembly and disassembly unit 2 is connected to the main body 1, and the air passage 20 connects the connection port 20a and the suction port 20b. The connection port 20a opens on the outer surface of the air connection part 9 and is continuous with the space 21, and the suction port 20b opens on the front end face of the assembly and disassembly unit 2.

[0035] The suction port 20b is formed by the cylindrical space between the outer peripheral surface of the front end of the wrench 4 and the inner peripheral surface of the small diameter portion 14b. The exhaust port 20c is formed on the base end surface of the joint 3b and is open to the space 21 inside the air connection portion 9. The air passage 20 extends in the direction along the long side axis A inside the joint 3b and the mounting and disassembly unit 2, and connects the exhaust port 20c and the suction port 20b.

[0036] The air intake device for sucking air is connected to the connection port 20a via the joint 15. The air intake device is a device having a large air intake flow rate such as a vacuum flow rate. For example, the air intake flow rate of the air intake device is 100L / min or more, preferably 500L / min or more. With such a large air intake flow rate, air is sucked into the suction port 20b at a large flow rate, thereby generating a suction force at the suction port 20b. The air intake device can also be a part of the nut runner device 100.

[0037] The air passage 20 is configured so that the connection between the connection port 20 a and the suction port 20 b is maintained even while the main shaft 3 and the attachment / detachment unit 2 are rotating.

[0038] Specifically, the air passage 20 has a first portion which is a space 21 inside the air connection portion 9 , a second portion 22 provided inside the joint 3 b , a third portion 23 provided inside the first housing 13 , and a fourth portion 24 provided inside the second housing 14 .

[0039] The second portion 22 is arranged along the circumferential direction around the long side axis A, and is composed of a plurality of branch channels that penetrate the joint portion 3b in directions parallel to the long side axis A. The plurality of branch channels are respectively connected to the first portion 21, and the connection between each branch channel and the first portion 21 is continuously maintained during the rotation of the joint portion 3b relative to the air connection portion 9.

[0040] The third portion 23 is arranged along the circumferential direction around the central axis B, and is composed of a plurality of branch channels that penetrate the first housing 13 in directions parallel to the central axis B. The plurality of branch channels of the third portion 23 are arranged at positions corresponding to the plurality of branch channels of the second portion 22, respectively. When the mounting and disassembling unit 2 is connected to the main body 1, the plurality of branch channels of the third portion 23 are connected to the plurality of branch channels of the second portion 22, respectively.

[0041] The fourth portion 24 is formed by a cylindrical space between the outer peripheral surface of the wrench 4 and the inner peripheral surface of the second housing 14, and is a space that is continuous over the entire circumference of the central axis B. The suction port 20b is formed by the front end portion of the fourth portion 24. The plurality of branch passages of the third portion 23 are connected to the fourth portion 24.

[0042] Here, the inner diameter of the small diameter portion 14b is larger than the outer diameter of the front end portion of the wrench 4 and the outer diameter of the head of the fastening member S fitted to the front end of the wrench 4. Therefore, when the head of the fastening member S is fitted to the front end of the wrench 4, the suction port 20b is not completely blocked by the fastening member S, but is opened at least at the peripheral portion of the suction port 20b. Thus, when the head of the fastening member S is fitted to the front end of the wrench 4, the air sucked from the suction port 20b to the discharge port 20c passes through the front end portion of the wrench 4 and the side of the fastening member S, thereby continuously sucking air into the suction port 20b at a large flow rate.

[0043] In addition, the nut wrench device 100 includes: a connecting mechanism 30, which is arranged at the joint 3b and the first shell 13, and connects the assembly and disassembly unit 2 to the main body 1 so that the wrench 4 rotates integrally with the spindle 3; and a releasing mechanism 40, which is arranged on the main body 1, and is used to release the connection between the assembly and disassembly unit 2 and the main body 1 by the connecting mechanism 30.

[0044] Specifically, if Figure 6 and Figure 7 As shown, the connection mechanism 30 includes a movable member 31 , a ball 32 , and a biasing member 33 provided in the joint portion 3 b , and a fitting hole 34 and a ball engagement groove 35 provided in the first housing 13 .

[0045] The release mechanism 40 includes a pressing plate 41 and an air cylinder 42 .

[0046] The movable member 31 is arranged along the longitudinal axis A inside the joint 3b, and the front end of the movable member 31 protrudes from the front end surface of the joint 3b. The movable member 31 is arranged to be movable along the longitudinal axis A relative to the joint 3b, and not to rotate around the longitudinal axis A relative to the joint 3b. A handle 31a extending in a direction orthogonal to the longitudinal axis A is provided at the base end of the movable member 31, and the handle 31a extends to the outside of the joint 3b via a window 3c formed on the side wall of the joint 3b. The window 3c extends in the direction along the longitudinal axis A, and allows the movable member 31 to move between a locked position and an unlocked position below the locked position.

[0047] The ball 32 is held at the front end of the movable member 31 so as to be able to protrude and retract in a direction perpendicular to the longitudinal axis A. The ball 32 is urged in a direction protruding from the front end of the movable member 31 by an urging member such as a spring (not shown).

[0048] The urging member 33 is, for example, a spring plunger, and urges the handle 31 a in the locked position.

[0049] The fitting hole 34 opens at the base end surface of the first housing 13, and the front end of the movable member 31 fits into the fitting hole 34. The front end of the movable member 31 in the direction orthogonal to the axes A and B and the side cross-section of the fitting hole 34 are non-circular, and by fitting the front end of the movable member 31 into the fitting hole 34, the joint 3b and the mounting and disassembling unit 2 are prevented from rotating relative to each other around the axes A and B.

[0050] A ball engaging groove 35 is formed on the inner surface of the fitting hole 34 and is recessed toward the radial outside and accommodates the ball 32 in the radial direction. Figure 7 As shown in FIG. 1 , when the handle 31a is in the locked position, the ball 32 protrudes into the ball engaging groove 35 and engages with the ball engaging groove 35 in the direction along the long side axis A. Thus, the mounting and disassembly unit 2 is connected to the main body 1. In addition, by moving the handle 31a from the locked position to the unlocked position, as shown in FIG. Figure 6 As shown, the ball 32 is pressed against the inner surface of the fitting hole 34 and recessed into the movable member 31, thereby releasing the engagement between the ball 32 and the ball engagement groove 35. Thus, the connection between the detachable unit 2 and the main body 1 is released.

[0051] The pressing plate 41 is arranged on the outer side of the joint 3b and on the base end surface of the handle 31a. The cylinder 42 is supported by the support portion 6 and connected to the pressing plate 41. The cylinder 42 moves the pressing plate 41 toward the front end side by supplying compressed air from an air source such as an air compressor (not shown in the figure), whereby the handle 31a moves from the locked position to the unlocked position against the applied force of the force-applying member 33. Thus, the connection between the assembly and disassembly unit 2 and the main body 1 can be released. In addition, the cylinder 42 uses the discharge of air to move the pressing plate 41 toward the base end side, whereby the handle 31a moves from the unlocked position to the locked position under the action of the applied force of the force-applying member 33. The supply of air to the cylinder 42 and the discharge of air from the cylinder 42 are controlled, for example, by a control device that controls an industrial robot.

[0052] Next, the operation of the nut runner device 100 will be described.

[0053] The nut runner device 100 moves to a predetermined position where one or more fastening members S are arranged through the action of the robot arm, and the front end of the assembly and disassembly unit 2 is positioned near the fastening member S. Next, the air intake device is started to suck air into the air passage 20 at a large flow rate, and a strong attraction force is generated at the suction port 20b by the large flow of air flowing toward the suction port 20b. Under the action of this strong attraction force, the fastening member S is attracted to the front end of the wrench 4, and the head of the fastening member S is embedded in the front end of the wrench 4.

[0054] When the head of the fastening member S is fitted to the front end of the wrench 4, a large amount of air passes through the front end of the wrench 4 and the side of the fastening member S and is continuously sucked from the suction port 20b to the air connection port 20a, thereby continuously generating a strong suction force at the suction port 20b. Under the action of this suction force, the fastening member S is fixed to the front end of the wrench 4.

[0055] Next, the nut runner device 100 holding the fastening member S is moved to another position where the member to be fastened is arranged by the action of the robot arm. Then, the spindle 3 and the mounting and disassembling unit 2 are rotated integrally around the axes A and B by the operation of the motor, so that the fastening member S is fastened to the member to be fastened.

[0056] When fastening another type of fastening member S, the release mechanism 40 may be controlled by, for example, a robot control device, so that the attachment and detachment unit 2 connected to the main body 1 may be automatically replaced.

[0057] Specifically, the air cylinder 42 moves the handle 31 a from the locked position to the unlocked position by supplying air, thereby releasing the engagement between the ball 32 and the ball engagement groove 35 , and separating the attachable and detachable unit 2 from the main body 1 .

[0058] Next, the main body 1 moves toward the other detachable unit 2 by the action of the robot arm, and approaches the other detachable unit 2 while slowly rotating around the long side axis A. As a result, the front end of the movable member 31 protruding from the front end surface of the joint 3b is inserted into the fitting hole 34 of the other detachable unit 2. Then, the other detachable unit 2 is connected to the main body 1 by engaging the ball 32 with the ball engaging groove 35.

[0059] As described above, according to the present embodiment, in a state where the fastening member S is fitted to the front end of the wrench 4, air is sucked in at a large flow rate through the front end of the wrench 4 and the side of the fastening member S, and the fastening member S is fixed and held to the wrench 4 by the attraction force generated by the flow of the large flow rate of air. Therefore, unlike the case where the fastening member S is held by vacuum adsorption, a strong attraction force can be stably exerted regardless of whether the airtightness of the air passage 20 is reduced, and the fastening member S can be stably held and conveyed.

[0060] In addition, when the fastening member is held by vacuum adsorption, a high vacuum degree of the air passage needs to be achieved, and thus a sealing member for sealing the passage needs to be provided at various locations of the nut runner device. In contrast, in the case of the nut runner device 100 of the present embodiment, an attractive force can be generated regardless of the vacuum degree of the air passage 20, and thus a sealing member for sealing the air passage 20 is not required. Therefore, the structure of the nut runner device 100 can be simplified, and the cost of the nut runner device 100 can be suppressed.

[0061] For example, in the present embodiment, there may be a gap between the inner peripheral surface of the opening 9a and the outer peripheral surface of the drive shaft 3a, and there may be a gap between the inner peripheral surface of the opening 9b and the outer peripheral surface of the base end of the joint 3b. That is, the sealing member of the first portion 21 for sealing the inside of the air connection portion 9 may not be provided in these gaps. In order to suppress the decrease in the suction flow rate of the air at the suction port 20b caused by the air flowing into the air passage 20 through these gaps, it is preferred that these gaps are extremely small, and it is preferred to ensure that the distance of the gap along the direction of the long side axis A is sufficiently long.

[0062] In addition, a plurality of mounting and disassembling units 2 are prepared, each having a different type of wrench 4 and the same structure of the housing 12, and the plurality of mounting and disassembling units 2 can be selectively mounted or disassembled on the main body 1 through the connection mechanism 30. Therefore, it is possible to automatically operate and tighten a plurality of fastening members S using one main body 1, without having to prepare a different nut runner device for each type of the fastening member S.

[0063] In addition, the detachable unit 2 has a compact and simple structure, and in particular, the small diameter portion 14b of the second housing 14 disposed near the fastening member S has a small diameter and a simple structure. Therefore, interference between the nut runner device 100 and the fastening member S can be prevented, and the cost of the detachable unit 2 can be reduced.

[0064] In addition, by providing a larger space between the inner circumference of the large diameter portion 14a and the outer circumference of the wrench 4 between the multiple branch channels of the third part 23 and the suction port 20b, the suction force of the suction port 20b can be made uniform. For example, if the multiple branch channels of the third part 23 are directly connected to the channels in the small diameter portion 14b, a spatial deviation of the suction force will occur at the suction port 20b. In contrast, according to the present embodiment, by making the suction flow rate spatially uniform in the larger space in the large diameter portion 14a, a spatial deviation of the suction force at the suction port 20b can be prevented.

[0065] In the present embodiment, the air passage 20 is composed of a first part 21, a second part 22, a third part 23 and a fourth part 24, but the specific structure of the air passage 20 is not limited thereto. As long as the connection between the connecting port 20a and the suction port 20b can be maintained during the rotation of the main shaft 3 and the assembly and disassembly unit 2, the structure of the air passage 20 can be arbitrarily changed.

[0066] In the present embodiment, the release mechanism 40 includes the air cylinder 42 driven by air pressure, but may instead include a drive mechanism driven by electricity, such as an electric cylinder. In addition, the release mechanism 40 may be provided in the attachment and detachment unit 2 instead of the main body 1 .

[0067] Description of Reference Numerals

[0068] 1: Main body

[0069] 2: Assembly and disassembly unit

[0070] 3: Spindle

[0071] 3a: drive shaft, spindle

[0072] 3b: Joint, spindle

[0073] 4: Wrench

[0074] 6: Supporting part

[0075] 9: Air connection

[0076] 12: Shell

[0077] 13: First Shell

[0078] 14: Second Shell

[0079] 14a: Large diameter part

[0080] 14b: Trail section

[0081] 20: Air channel

[0082] 20a: Connector

[0083] 20b: Inlet

[0084] 20c: Exhaust port

[0085] 21: Part I, Space

[0086] 22: Part 2

[0087] 23: Part 3

[0088] 24: Part 4

[0089] 30: Connecting mechanism

[0090] 40: Dismantling the institution

[0091] 100: Nut wrench device

[0092] A: Long side axis

[0093] S: Fastening member

Claims

1. A nut wrench device, It is characterized in that include: a main body having a main shaft and a support portion, wherein the support portion supports the main shaft so as to be rotatable about a long side axis of the main shaft; an assembly and disassembly unit, the assembly and disassembly unit being removably connected to the front end of the main body, wherein the assembly and disassembly unit has a wrench, and has a first shell and a second shell for accommodating the wrench inside, the second shell having a large diameter portion and a small diameter portion, and the wrench is configured to be coaxial with the main shaft and rotatable integrally with the main shaft; and an air passage extending in the direction along the long side axis inside the main shaft and the mounting and disassembling unit and connecting the discharge port provided on the main shaft and the suction port opened on the front end surface of the mounting and disassembling unit; The front end portion of the wrench is disposed in the suction port; When the front end of the mounting and disassembling unit is positioned near the fastening member engaged with the front end of the wrench, the air sucked from the suction port through the air passage to the discharge port passes through the front end of the wrench and the side of the fastening member, thereby generating suction force at the suction port. Under the action of the suction force generated at the suction port, the fastening member is fixed to the front end of the wrench. The air passage has a third portion arranged in the first shell and a fourth portion arranged in the second shell; the space between the inner circumference of the large diameter portion and the outer circumference of the wrench is larger than the space between the inner circumference of the small diameter portion and the outer circumference of the wrench.

2. The nut runner device according to claim 1, It is characterized in that The main shaft has a driving shaft and a joint portion, the joint portion is columnar and is arranged at the front end of the driving shaft, and the discharge port is formed on the base end surface of the joint portion; The support portion has an air connection portion, the air connection portion is arranged around the main shaft, and a space for the discharge port to open is formed between the air connection portion and the main shaft; The air passage has a first portion disposed at the air connection portion and a second portion disposed at the joint portion; The first part is composed of the space; The second portion is arranged along the circumferential direction around the longitudinal axis and is composed of a plurality of branch channels that penetrate the joint portion in directions parallel to the longitudinal axis.

3. The nut runner device according to claim 2, It is characterized in that The first housing is columnar and is configured to be coaxial with the long side axis and holds the base end of the wrench, and the second housing is configured to be coaxial with the long side axis and fixed to the front end of the first housing; The third part is arranged along the circumferential direction around the long side axis and is composed of a plurality of branch channels respectively penetrating the first shell in a direction parallel to the long side axis, and the plurality of branch channels of the third part are respectively connected with the plurality of branch channels of the second part; The fourth portion is formed by a cylindrical space between the outer peripheral surface of the wrench and the inner peripheral surface of the second housing.

4. The nut runner device according to claim 3, It is characterized in that The small diameter portion is disposed on the front end side of the large diameter portion and has an outer diameter smaller than an outer diameter of the large diameter portion.

5. The nut runner device according to any one of claims 1 to 4, It is characterized in that The nut runner device includes an air intake device connected to a connection port opened on the outer surface of the support portion and sucking air at a flow rate of 100 L / min or more.

6. The nut runner device according to any one of claims 1 to 4, It is characterized in that include: A connecting mechanism, the connecting mechanism connecting the mounting and disassembling unit to the main body so that the wrench rotates integrally with the main shaft; as well as a releasing mechanism, the releasing mechanism releasing the connection between the mounting and disassembling unit and the main body by the connecting mechanism; The release mechanism is driven by air pressure or electricity.

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