JPS58171227A - Bolt mounting device - Google Patents

Abstract

PURPOSE:To enable to automate mounting of a bolt by making a screwing work in two processes, by a method wherein a plurality of bolts transferred to a screwing position is mounted on assembling parts simultaneously as it is and a screwing rotor is turned. CONSTITUTION:A cylinder 14 is secured on a horizontal plate 13 and a bracket 17A of an up-and-down slider 16 is sticked on a cylinder shaft 15. A screwing rotor 7 is fitted in the slider 16 rotatably, and further a receiving rotary structure 2 and a screwing rotary structure 3 are installed on a lower plate 19 of the slider 16 and a lower circular plate 20 to be fitted in the lower plate 19 respectively. A rotary plate 41 is suspended from the lower plate 19 slidably vertically and rotatably centering around a stationary guide shaft 11, and a bolt holding sturucture 4 is installed on the rotary plate 41. Simultaneously with an up-and- down movement of the up-and-down slider 16 screwing action of a bolt A held by the bolt holding structure 4 into a bolt receiving hole of assembling parts B is made through the screwing rotary structure 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bolt assembly device that can be assembled to multiple ports at the same time as an accessory device of an automatic machine assembly machine, various special processing machines, etc., and that can also change the position of bolt assembly. .

Conventionally, screws and bolts have been used everywhere, including in various machines, equipment, and single parts of devices. However, those mechanical devices.

Screws and bolts are often tightened in the assembly of equipment, etc., but automation is limited to small screws, and there is no automation in which a large number of bolts are transferred and immediately tightened. At present, there is no suitable device. Furthermore, if the pitch of bolt assembly is small on the same circumference, it is almost impossible to automate port assembly. Therefore, it is convenient when connecting the assembled parts to each other. The applicant first automatically assembles the assembled parts by transporting the bolts to the working position,
We have provided an automated bolt assembly device that immediately tightens the bolt in that state, but even with this, if the pitch is large, multiple bolts can be transported at once on the same circumference. However, if the pitch is small when assembling the bolts on the same circumference, the screw rotation mechanisms that screw in the bolts will interfere with each other, making it impossible to assemble all the bolts. It was impossible.

In view of the above-mentioned current situation, the present invention divides bolt assembly on the same circumference into two processes even when the pitch is small, and automatically transports multiple bolts to the working position for assembly of assembled parts, and seven steps. The entire device provides automated port assembly, which allows bolts to be screwed in immediately.

Hereinafter, the contents of the present invention will be explained in detail by showing examples. FIG. 1 shows an overall schematic diagram of an embodiment of the device of the present invention, FIG. 2 shows a sectional view of the essential parts, and FIG.
The figure shows an explanatory diagram of the rotation drive unit.

In the figure, a plurality of bolts Ai are sent aligned in a line through alignment grooves by a parts feeder, etc., and a bolt positioning mechanism (not shown) allows bolts to be installed in assembly part B to correspond to the same positional relationship as the position. Hold the bolt in the holding position. In this embodiment, in Fig. 4, Fig. 1 mV-
As shown in the IV view, there are 45
Although the bolts are installed at regular intervals, the number of bolts is not limited to eight. The present invention relates to a device for transporting this held port Ai assembly B and for screwing it into position.

First, the fixed guide shaft 11 and the auxiliary guide shaft 12 are fixed and erected on the base 10 of the machine. A horizontal plate 131 is installed on the upper ends of the fixed guide shaft 11 and the auxiliary guide shaft 12, and the horizontal plate 13
The vertical mechanism 1 is installed at. That is, a cylinder 14 is fixed on this horizontal plate 13, and the tip of a cylinder shaft 15 of this cylinder 14 is attached to an upper plate 17 of a vertical sliding body 16 that can slide vertically using a fixed guide shaft 11 and an auxiliary guide shaft 12 as guides. Fix it to the installed bracket) 17A. Further, an upper disk 18 is rotatably fitted onto the upper plate 17 of the vertical sliding body 16.

Further, a lower disc 20 is rotatably fitted on the lower plate 19 of the vertical sliding body 16 on the same axis as the upper disc 18, and the upper disc 1
Both ends of the connecting rod 21 are fixedly attached to each of the lower disc 8 and the lower disc 20 to form a screwed rotating body 7, and the vertical sliding body 16
Rotatably fit into the Further, as the rotation mechanism 6, a cylinder 22 is attached to the upper plate 17 of the vertical sliding body 16, and the tip of the cylinder shaft 23 is pivoted to a support pin 24 fixed to the 1-disk 18 of rotation f*7 by screwing. Ru. Roughly, on the lower plate 19 of the vertical sliding body 16, screws 25 (in this embodiment, 8 pieces, the same number as ports A/FA) are suspended. A rotating cylinder 27 is attached to a bracket 26 fixed to the lower plate 19 of the vertical sliding body 16, and a gear 29t with a long tooth width is fixed to the rotating shaft 28 of the rotating cylinder 270. Further, a rotating shaft 25t is provided which penetrates the lower plate 19 of the vertical sliding body 16 and can slide and rotate in the vertical direction, and a gear 30' is cut into the upper end flange portion of the rotating shaft 25. Bite together. Furthermore, the spring bearing is biased below the rotating shaft 25.
The gear 30 has its flange lower surface in contact with the lower plate 19,
It also serves as a stopper that defines the lower part of the rotating shaft 25. Furthermore, a hexagonal hole 3 having a hexagonal shape is provided at the lower end of the rotating shaft 25.
3 is recessed. On the other hand, in this embodiment, four screw rotation mechanisms 3 are installed on the lower disk 20 of the screw rotation body 7 at 90 degree intervals, and the screw rotation body 7 is intermittently rotated through the support pin 24 by the action of the cylinder 22. By being rotated twice, the position of each screw-in rotation mechanism is at a position symmetrical to the rotation axis 25 with the fixed guide shaft 11 as the center, and the position of the assembly part B is symmetrical to the axis of the position. It is installed at a position that has the same axis as the That is, the nut runner 340 is fixed to the lower disk 20 which is rotatably fitted to the lower plate 19 of the vertical sliding body 16, and the bottle 36 is inserted through the rotating shaft 35 of the rotating shaft 37. Loosely insert the bottle 36 into the holder. In addition, the lower end surface of the nut runner 34 and the rotating tool /1/
A compression spring 39 is inserted between the upper end surfaces of the rotary tool 1v37 to constantly urge the rotating tool 1v37 downward. Further rotation tool 1v37
A hexagonal hole 40 having the same shape as the hexagonal hole 33 is recessed in the lower end of the hexagonal hole 33 . Further, below the lower plate 19 of the vertical sliding body 16, a rotary plate 41 is suspended from the lower plate 19 so as to be vertically slidable and rotatable about the fixed guide shaft 11, and a port holding mechanism 4 is installed on the rotary plate 41. do.

In other words, the cylindrical body 42 with the flange portion has a lower plate 19'.
The cylindrical body 42 is slidably inserted into the fixed guide shaft 11 through the cylindrical body 42 , the flange portion of the cylindrical body 42 is fixed to the lower plate 19 , and the hanging ring 43 is fixed to the lower end of the cylindrical body 42 . A clamping ring 45 is rotatably clamped on the outer periphery of the cylindrical body 42 between the hanging ring 43 and the lower plate 19 via bearings 44 and 44, and is slidable and rotatable up and down on the fixed guide shaft 11, and is attached to the flange part. The upper end of the rotating body 47 having 46 sliding parts and the clamping ring 45
Stick together and become one. A retaining ring 48 having an outer diameter larger than the outer diameter of the sliding part 46 is fixed to the lower end surface of the rotating body 47. 49 is a bearing metal provided between the fixed guide shaft 11 and the rotating body 47. Further, a retaining body 51 having a flange portion that can only vertically slide on the rotating body 47 is attached to the outer periphery of the sliding portion 46 using a guide key 50, and the engaging body 51 is connected to the rotating plate 47.
1, and connects the flange portion of the engaging body 51 and the rotary plate 4.
1tl - stick.

Further, a spring receiver 52 is recessed in the upper end surface of the engaging body 51, and a compression spring 54 is inserted between it and a spring receiver 53 recessed in the rotating body 47. Due to this compression spring 54, the rotating plate 41, which is fixed to the holding body 51 via the holding body 51, is constantly pushed down, and the lower end surface of the holding body 51 is fixed to the lower end surface of the rotating body 47. comes into contact with.

Further, a gear portion 55 is cut into the flange portion of the rotating body 47, and the rotating plate 41 is rotated via the rotating body 47 by the rotation drive mechanism 5 installed on the lower plate 19. That is, the rotating cylinder 56 is attached to the lower plate 19, and the intermediate shaft 58 is attached to the rotating shaft 57 of the rotating cylinder 56 passing through the top plate 1511.
is mounted non-rotatably via a key, and a gear 59 is non-rotatably disposed at the tip of the intermediate shaft 58 via a key. This gear 59 is meshed with the gear portion 55, and the rotating cylinder 5
6 rotates the rotating plate 41 via the rotating body 47. In this embodiment, a rotary cylinder and a set of gears are used as the rotary drive mechanism, but the present invention is not limited to this, and a rotary drive mechanism such as a rack and a pinion may be used. Porto holding mechanism 4 is assembled with rotating plate 41 as part B.
Bolt mounting is performed by installing only the number of bolts, and in this embodiment, a total of eight bolts are installed, four on the left and right with the fixed guide plate 11 at the center, and the four bolt holding mechanisms 4 on each side are attached to the fifth bolt.
They are installed at 90 degree intervals as shown in the v-v sectional view of Figure 2. That is, centering on the fixed guide shaft 11, one port holding mechanism 4 moves to the port i at the port holding position shown in FIG.
When the rotating plate 41 is located at the same axial center position as the bolt axis at the position A1, and when the rotating plate 41 is rotated 180 degrees, the other port holding mechanism 4 is attached to the bolt A2 at the bolt holding position shown in FIG. It can be installed on the rotary plate 41 at the same axis position as the port axis. Furthermore, when the port holding mechanisms 4 provided on the rotating plates 41 are located on the opposite side of the port holding position with respect to the fixed guide shaft 11, the bolts of the assembly parts B are assembled at the same axial center position as the axial center of the position. Install. This port holding mechanism 4 is a sliding member that can vertically slide and rotate along the internal sliding surface of a hollow sliding holder 60 that passes through the rotating plate 41 and is fixed to the rotating plate 41 at its flange in the vertical direction. bar 61
It consists of A spring receiver 62 is provided on the upper part of the sliding rod 61, and a compression spring 63 is fully inserted between it and the rotating plate 41. Note that the elastic force of this compression spring 63 is the same as that of the compression spring 32.
And use one with a weaker elasticity than the compression spring 39. Furthermore, a locking collar 64 is provided protrudingly below the sliding rod. Therefore, the sliding rod 61 is always VC biased upward (FIG. 211-), and the locking collar 64 comes into contact with the sliding holder 60. 1. A hexagonal hole 65 having a hexagonal shape into which the head of Pol I-A can fit is provided in the lower end surface of the sliding rod 61.
Furthermore, a magnet 66 is buried in the bottom of the hexagonal hole 65.

On the other hand, the hexagonal holes 33 and 4 are located at the upper end of the sliding rod 61.
A hexagonal column 67 that can be fitted to the 0 is provided in a protruding manner. In addition, 68 is the rotary plate 4 in order to completely fix the combined parts when screwing in the bolt.
This is a parts holder protruding from 1.

AFi is held at each predetermined position shown in FIG. At this point, the cylinder 14 starts operating and the cylinder shaft 15
As a result, the vertical sliding body 16 starts descending. As the vertical sliding body 16 descends, the cylindrical body 42 is fixed to the lower plate 19.
Since the vertical sliding body 1 also descends, the vertical sliding body 1
The rotating body 47, which is integrated with the clamping ring 45 which is clamped between the lower plate 19 of 6 and the hanging ring 43, also descends. This causes the compression to 5
The rotating plate 41, which is completely fixed to the holding body 51 and the engaging body 51, which are pressed by the action of step 4, also descends at the same time. Then, when the component presser 68 provided on the rotary plate 41 comes into contact with the assembled part B, the downward movement of the rotary plate 41 is stopped. However, since the vertical sliding body 16 is further pushed down by the operation of the cylinder 14, the compression spring 54 is compressed, and the rotating body 47
The sliding portion 46 continues to slide down the inner diameter of the engaging body 51 under the guidance of the guide key 50. As the vertical sliding body 16 descends, the rotating shaft 25 installed on the lower plate 19 also descends. Therefore, the lower end surface of the rotating shaft 25, on which the sliding rod 61 is located below, comes into contact with the upper end surface of the sliding rod 61, and the sliding rod 61 is inside the sliding holder 60 provided on the rotating plate 41 that has stopped its descent. The compression spring 63t is lowered while being compressed along the sliding surface. In this case, the rotating shaft 25 below which the sliding rod 61 is not located remains as it is and descends together with the lower plate 19. Then, the lower end surface of the descending sliding rod 61 comes into contact with the upper end of the head of the straight bolt AI that can hold the position, and the sliding rod 61 stops.However, as the lower plate 19 further descends from there, the compression is reduced. Ne32
is compressed, and when the rotary shaft 25 moves upward by a set amount with respect to the lower plate 19, the operation of the cylinder 14 is stopped, and the downward movement of the vertical sliding body 16 is stopped. Then rotate/Linda 27
starts operating and rotates the rotating shaft 28 of the rotating cylinder 27. Therefore, the gear 29 and gear 2 attached to the rotating shaft 28
The rotating shaft 25 idles through the gear portion 30 meshing with the gear 9. Due to this rotational movement of the rotating shaft 250, when the hexagonal pillars 67 protruding from the upper end of the sliding rod 61 fit into the hexagonal holes 33 recessed in the lower end surface of the rotating shaft 25, the hexagonal shapes of the respective hexagons match.
The compression spring 32 is charged by its elastic force. Further, by fitting the hexagonal column 67 into the hexagonal hole 33, the rotation of the rotating shaft 28 of the rotating cylinder 27 is transmitted to the sliding rod 61 via the gear 29 and the rotating shaft 25. When the hexagonal shape of the hexagonal hole 65 recessed in the lower end surface of the sliding rod 61 and the head of the port A1 coincide with each other due to the rotation of the sliding rod 61,
It is inserted by the elastic force of the compression spring 32. This hexagonal hole 6
By inserting the head of port A1 into 5, the upper end of the head of port A1 becomes the magnet 66 buried in the sliding rod 61.
The port Al is held at the lower end of the sliding rod 61 by its adsorption force. After the above operation, the cylinder 14 draws the cylinder shaft 15 in a direction opposite to that shown in E.

Therefore, the vertical sliding body 16 attached to the cylinder shaft 15
is guided by the fixed guide shaft 11 and the auxiliary guide shaft 12 and ascends. As the vertical sliding body 16 rises, the rotation shaft 25 of the receiving rotation mechanism 20 installed on the lower plate 19 rotates around the compression spring 3.
2, the lower surface of the gear 30 comes into contact with the lower plate 19, and then rises together with the lower plate 19. Furthermore, as the rotating shaft 25 rises, the sliding rod 61 is also compressed into the hexagonal hole 6 by the action of the compression spring 63.
At 5, the head of the pole 1-AI is attracted by the attraction force of the magnet 66, and the pole 1-AI is raised to 1, and the locking collar 64 comes into contact with the sliding holder 60 and stops rising. As the lower plate 19 further rises, the rotating shaft 25 also rises, and the hexagonal hole 33 of the rotating shaft 25 and the hexagonal column 67 at the upper end of the sliding rod 61 are disengaged from each other. Moreover, by further raising the lower plate 19, the lower plate 1
The retaining ring 4 is connected via the cylindrical body 42 and the rotating body 47 provided in
8 rises. Therefore, due to the action of the compression spring 54, the engagement ring 48 comes into contact with the retainer 51, which is fixed to the rotary plate 41 having the component retainer 68, which was pressing the assembled part Bf, and the -toe plate 19 and the rotary plate 41 are pressed together. It rises as one and stops at a predetermined position.

1. At the same time as the vertical sliding body 16 moves up and down, the bolt l-A is held by the bolt holding mechanism 4 by the screw rotation mechanism 3.
'i This operation is performed by screwing into the bolt receiving hole of assembly part B, which will be described later. After the vertical sliding body 16 has been raised, the rotary plate 41 is rotated 180 degrees around the fixed guide sleeve 11 by the rotary drive mechanism 5.

That is, by rotating the rotating cylinder 560, its rotating shaft 5
7. The gear part 55 is rotated via the intermediate shaft 58 and the gear 59, and the rotation of the gear part 55 causes the rotating plate 41 to which the retainer 51 is fixed via the rotating body 47 and the guide key 50 to the fixed guide shaft 11. The fixed guide shaft 1 is rotated 180 degrees around
The respective bolt holding mechanisms 4 provided at opposite positions with respect to 1 are respectively moved to opposite positions. For this reason, each bolt holding mechanism 4 provided on the right side of the rotary plate 41 shown in FIG. 5 was positioned at a position having the same axis as the port TAl shown in FIG. By rotating the rotating plate 41 by 180 degrees, each bolt holding mechanism 4 provided on the left side of the rotating plate 41 shown in FIG. It is positioned and installed at a position having the same axis as 1-A2. Then, the cylinder 14 causes the cylinder shaft 15 to lower the vertical sliding body 16 again, so that the rotary plate 41 is lowered together with the vertical sliding body 16 by the action of the compression spring 54. At the same time, with the same operation as described above, the receiving and rotating mechanism 2 causes the bolt holding mechanism 4, which is different from the bolt holding mechanism 4 and which is located at the opposite position to the bolt holding position as the entire center of the fixed guide shaft 11, to move the previous upper and lower positions. An operation is performed to receive the remaining poles 1-A2 that were not held due to the lowering of the sliding body 16, but the details are the same as described above and will therefore be omitted. Due to this lowering, the component holder 68 comes into contact with the assembled component B, and the rotating plate 4
1 stops descending. However, the vertical sliding body 16 is further pushed and lowered by the action of the cylinder 14. Therefore, the rotor 4 slides on the inner diameter of the retainer 51 fixed to the rotor plate 41.
7 is lowered, the compression spring 54 is compressed, and the cylinder f4-42
The vertical sliding body 16 including the rotating body 47 continues to descend.

As a result, the rotation tool IV3 of the screw-in rotation mechanism 3 installed on the lower disk 20 fitted to the lower plate 19 of the vertical sliding body 16
7 comes into contact with a hexagonal column 67 protruding from the upper end of the sliding rod 61, and the sliding rod 61 slides on the inner diameter of the sliding holder 60 fixed to the rotary plate 41 which has stopped descending, and is compressed by the compression spring 63. Descend while resisting. Therefore, the hexagonal hole 6 at the lower end of the descending sliding rod 61
Bo/&1-AI with the head fitted to 5 is assembly part B
The lower end of the pore y) Al contacts the threaded portion of the bolt mounting hole, and the sliding rod 61 stops descending.

However, as the lower plate 19 further descends, the compression spring 39 is compressed, and after the vertical slide body 16 descends to the set position, the operation of the cylinder 14 is stopped. Then, the nut runner 34 of the screw-in rotation mechanism 3 starts operating, and the rotation of the rotation shaft 35 is transmitted to rotation 2/L/37. Then, as the rotary tool 37 rotates, the rotary tool I
A hexagonal hole 40 recessed in one end of v37 and a sliding rod 61
When the shapes of the hexagonal columns 67 protruding from the upper ends of the hexagonal columns match each other, the hexagonal columns 67 are charged with a compression force of 390. Then, by fitting the hexagonal column 67 into the hexagonal hole 40, the nut runner
350 rotations of the 340 rotation shaft are transmitted to the sliding rod 61 via the rotation tool 1V37.

A pole 1 is recessed in the lower end of the sliding rod 61 and has a head held in a square hole 65 by the attraction force of a magnet 66.
-At is screwed into the threaded portion of the bolt mounting hole of the assembly part B by the rotation of this sliding rod 61. When this port tightening work is completed (at this time, the operation of the bolt holding mechanism 4 receiving the port 1-A2 by the receiving 9 rotation mechanism 2 is completed), the cylinder shaft 15 is moved up and down by the operation of the cylinder 14. The sliding body 161 is raised along the fixed guide shaft 11 and the auxiliary guide shaft 12. As the vertical sliding body 16 rises, the rotating shaft 35 of the screw-in rotation mechanism 3 installed on the lower disc 20 fitted to the lower plate 19 of the vertical sliding body 16 rises and penetrates into the rotating shaft 35. The rotary tool 37, which is held via the elongated hole 38 by the loaded bottle 36, also rises. Further, as the rotating tool 1v37 rises, the sliding rod 61 having a hexagonal column 67 that fits into the hexagonal hole 40 also rises due to the action of the compression spring 63. At this time, the head of the bolt Al, which has completed the screwing operation, is removed from the hexagonal hole 65 formed in the lower end of the sliding rod 61. and sliding rod 61
With the rise of the sliding holder 60 fixed to the rotating plate 41
A lock 64 protruding from the sliding rod 61 comes into contact with the lower surface of the sliding rod 61, and the lifting of the sliding rod 61 is stopped. Furthermore, the vertical sliding body 1
6 rises, the hexagonal hole 40 recessed in the rotation tool/I/37 and the hexagonal column 67 protruding from the upper end of the sliding rod 61 are disengaged from each other. Further, as the vertical sliding body 16 rises further, the retaining body 51 is pulled up by the retaining ring 48 fixed to the lower end of the rotating body 47 that is engaged with the cylindrical body 42 fixed to the lower plate 19. The vertical sliding body 16 and the rotating plate 41 rise together. Then, it rises to a predetermined position, and the cylinder 14 stops operating. Subsequently, the rotary plate 41 is rotated by 18,080 degrees around the fixed guide shaft 11' by the rotary drive mechanism 5. Therefore, the bolt A2, whose axis is shifted by 45 degrees compared to the bolt Al screwed in by the above-mentioned operation, is located diagonally below the screw-in rotation mechanism 3. The upper part 22 is also operated in order to align the axes of the screw-in rotation mechanism 3 and the bolt holding mechanism 4. Therefore, the vertical sliding body 16 is moved by the melinda shaft 23 via the support pin 24.
The screw-in rotary body 7 fitted in is rotated by 45 degrees. As a result, the axis of the screw-in rotation mechanism 3 provided on the lower disk 20 is rotated by 45 degrees together with the lower disk 20, and the axis of the screw-in rotation mechanism 3 is rotated by the bolt holding mechanism installed on the rotation plate 41. 4 to the axial center position of port A/A2. After the screw-in rotation mechanism 3 is located at a position having the same axis just above the pole 1-A2, the vertical sliding body 16 is lowered by the cylinder 14 in the same manner as described above, but the details are the same as described above and will therefore be omitted. .

By repeating the above operations, it becomes possible to screw the bolts A into a large number of bolt attachment holes of the assembly part B that is sent to a predetermined position by a conveyor such as a belt conveyor.

As shown in the device described above, the present invention is capable of assembling bolts on the same circumference, which has been difficult to automate, in places with small pitches, and is capable of transporting and screwing bolts into assembled parts. Work: Automatically and continuously receive all bolts from the transport positioning position, transfer the received state to screwing position 1, simultaneously assemble multiple bolts to the assembled parts in that state, and rotate the screwing rotor. The screwing operation is automatically performed in two steps. Furthermore, since the device of the present invention can be easily attached as an accessory device to automatic assembly machines, special processing machines, etc., it has the advantage of being used as an applied device in various machines and devices. In addition,
In this embodiment, four holding mechanisms (Bo/L') to be attached to the rotary plate were installed on each side of the fixed guide shaft, but the number of sliding rods is not limited, and the number of assembly parts is not limited. The rotation angle of the disc is determined by the bolt mounting position.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of an embodiment of the device of the present invention, and FIG.
3 is an explanatory diagram of the rotary drive portion, FIG. 4 is a view from the perspective of FIG. 11, and FIG. 5 is a sectional view of the main part of FIG. 2. 1... Vertical mechanism 2... Receiving 9 rotation mechanism 3... Screw-in rotation mechanism 4... Bolt holding mechanism 5... Rotation drive mechanism 6... Rotation mechanism 7... Screw-in rotation body 11... ... Fixed guide shaft 16 ... Vertical sliding body 25 ... Rotating shaft 37 ... Rotating tool 41 ... Rotating plate 24 - Patent applicant Asahi Seiki Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] A rotary plate that can rotate up and down with respect to an inner shaft; a rotational drive mechanism that rotates the rotary plate; and a sliding rod that can slide and rotate in a vertical direction on the rotary plate. , Pol H at the tip of the sliding rod
- a port holding mechanism that allows the port to be held; a screwed rotary body that is rotatably fitted in the vertical sliding body; a rotation mechanism that rotates the screwed rotary body once; A rotatable rotating shaft is provided on the same axis as the bolt held in the bolt holding position, the rotating shaft and the sliding rod are engaged, and the sliding rod is rotated by the rotation of the rotating shaft. A receiving 9 rotating mechanism for receiving the bolt 6 at the tip; a rotating tool that can slide and rotate in the vertical direction is provided on the screwed rotating body = 1-, and the rotating tool and the sliding rod located directly below the rotating tool are engaged. , consists of a screw-in rotation mechanism that fully rotates the slide rod by rotation of a rotary tool and screws in the port I-I held at the tip of the slide rod. 11, the screwing rotary body is rotated completely so that the sliding rod is positioned directly under the rotary tool, and the bolt is screwed in with the rotary tool.