JP2838579B2 - Bolt automatic supply temporary fastening device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bolt automatic supply temporary fastening device.

(Conventional technology and problems to be solved) Conventionally, for example, in a case where an oil pan is screwed into an engine body in an engine assembly line, a belt conveyor 50 which is a conveyor for conveying a work as shown in FIG.
The operator previously attaches the bolt 60 to the tip of each socket 52 of the bolt tightening machine 51 disposed at a predetermined position above the engine body 59 on which the oil pan 58 is mounted. When being conveyed directly below the machine 51, the respective sockets 52 of the bolt tightening machine 51 are lowered while rotating, and the respective bolts 60 are passed through the respective bolt holes of the oil pan 58 to correspond to the corresponding engine bodies 59. It is screwed into each screw hole and tightened and fixed at the same time with a predetermined tightening torque.

When the bolts are to be fastened to the front end face of the engine body 59, the operator previously attaches the bolts 61 in advance to the respective screw holes on the front end face of the engine body 59 by hand and temporarily tightens the bolts. Are automatically or manually operated to tighten these bolts 61.

Above and on both sides of the belt conveyor 50, in addition to the bolt tighteners 51 and 53, bolt tighteners 55, 56, 57 and the like corresponding to the type of engine are provided.

However, in the above conventional bolt tightening machine,
It is necessary for the operator to manually attach bolts to each socket of the bolt tightening machine and the work side, especially when tightening the bolts to the work from the side, preventing the bolts from tilting by their own weight, It is necessary for an operator to temporarily temporarily tighten the bolt to the work side to a certain depth so that the socket can be accurately fitted to the socket of the tightening machine. For this reason, there is a problem that the work of fastening the bolt to the work is troublesome and the workability is poor.

Also, as shown in FIG. 9, a bolt supply chuck tightening section 65 is attached to each socket, and each bolt supply chuck tightening section is mounted.
A bolt feeder 66 is provided for each 65, and a bolt tightening machine 67 that supplies bolts from these parts feeders 66 to each bolt supply / chuck tightening section 65 to automate bolt tightening to the work is provided. Proposed. However, such a bolt tightening machine has a complicated structure due to its multi-shaft and requires a large mounting area, and has a high bolt supply defect (5).
%), Maintenance is not easy, it is necessary to provide a bolt supply / chuck and a parts feeder for each type of work, and it is extremely expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has a single socket, in which a bolt is supplied to each screw hole of a work having a plurality of screw holes, and the bolt is screwed halfway to temporarily tighten the bolt. It is intended to provide a device.

(Means for Solving the Problems) In order to achieve the above object, a bolt is automatically supplied by supplying a bolt to each screw hole of a work having a plurality of screw holes with a single socket, and screwing the bolt halfway to temporarily tighten the bolt. A tightening device, a round hole having a rod shape slightly larger in diameter than the head of the bolt, the head of the bolt being rotatably fitted at the tip, and the round hole being non-rotatably housed in the round hole. A socket provided with a magnet for attracting and holding the head of the inserted bolt, a first hole through which the socket is inserted so as to be able to advance and retreat, and one end merging with the tip of the first hole and the other end being a part A second hole connected to the feeder; a bolt shooter for supplying the bolt from the parts feeder to the first hole; and a spring force capable of opening and closing the tip of the first hole of the bolt shooter. Closed by Attached, a chuck that clamps the shaft of the bolt supplied from the parts feeder when closed, supports the bolt shooter so that it can move forward and backward, and takes in the bolt from the bolt shooter to the chuck when moving forward, A first cylinder that transfers the bolt clamped by the chuck to the round hole at the distal end of the socket when the socket is retracted, and is connected to a base end of the socket; A second cylinder that pushes the chuck open against the spring force to advance the socket and feeds the bolt to the screw hole; and a second cylinder connected to a base end of the socket to rotate the socket to rotate the magnet. Actuating the bolt, which is sucked and held by It is obtained by a structure in which a chromatography data.

(Operation) The chuck of the bolt automatic supply tightening device clamps and holds the shaft portion of the bolt supplied from the bolt shooter by a spring force, and when the first cylinder is retracted (shortened), the clamped bolt is tightened. The head and the flange are fitted into holes provided in the front end surface of the socket. At this time, the magnet provided at the tip of the socket attracts and holds the end face of the head of the bolt to be fitted. Thus, the bolt is held at the tip of the socket. Next, the second
When the cylinder moves forward (extends), the socket moves forward and the chuck is pushed and spread at the tip of the socket while holding the bolt. At the same time, the actuator rotates to rotate the socket. Then, the socket is rotated while moving forward, and the bolt held at the tip is screwed halfway into the screw hole of the work and temporarily tightened. This temporary tightening is performed to such an extent that the bolt does not swing. After the temporary tightening, the socket retreats with the retraction (shortening) of the second cylinder, returns to the rear of the chuck, and stands by again.

Embodiment An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an outline of a bolt automatic supply tightening system to which a bolt automatic supply temporary tightening device according to the present invention is applied, and a bolt automatic supply temporary tightening device 2 is provided at predetermined positions above and on a side of a belt conveyor 1. An automatic bolt tightening machine 4, 5 is disposed above and on the downstream side of the automatic bolt supply temporary tightening devices 2, 3. Incidentally, the automatic bolt tightening machines 6 to 8 are selectively used according to the type of the work.

Bolt automatic supply temporary tightening device 2, 3 is a one-axis robot 1.
The bolt automatic supply temporary tightening device 2 is mounted on the arms 10a, 11a of 0, 11 and supplies a work bolt, for example, an oil pan 58 attached to the engine body 59, and temporarily tightens the flange bolt. The device 3 supplies a bolt to the front end face of the engine body 59 and temporarily tightens the bolt. Then, the robots 10 and 11 sequentially move the respective bolt automatic supply temporary tightening devices 2 and 3 to the positions of the respective bolt holes of the engine body 59. still,
The automatic bolt tightening machines 4 to 8 are the same as the conventional ones.

 Next, the bolt automatic supply temporary fastening device 2 will be described.

As shown in FIGS. 2 to 5, the bolt automatic supply temporary tightening device 2 includes a main body 20, a socket 21 inserted into the main body 20 so as to be able to move forward and backward, and a chuck mounting portion 22 mounted on the tip of the socket 21. , The chuck 2 attached to the chuck mounting portion 22
3, an actuator mounted on the rear end of the main body 20 and connected to the rear end of the socket 21 to rotate the socket 21, for example, a nut runner 24 and a cylinder 25 which is fixedly arranged in parallel with the main body 20 and moves the chuck 22 forward and backward. It is configured.

The main body 20 is a double-acting air cylinder. Ports 20c and 20d are provided at a base end 20a and a distal end 20b, and these ports 20c and 20d are connected to an air source (not shown). As shown in FIGS. 3 and 4, the socket 21 has a rod-like shape, and a hole 21c having a length of about 2/3 of the entire length is formed at the axial center of the end face of the base end 21a.
And an opening end 21 on the base end 21a side of the hole 21c.
d (FIG. 4) is a square hole slightly smaller than the hole 21c. A piston 26 is externally fitted and fixed to the base end 21a of the socket 21.

Round holes 21e to 21g are formed concentrically in the axis of the end face of the tip 21b of the socket 21. And hole 21e
, The flange 60b of the flange bolt 60 and the head 60a in the hole 21f can be fitted respectively. The magnet 30 is inserted into the innermost small hole 21g.
The end face of the bolt head 60a inserted into 1f is sucked and held. Pins 31 are implanted at both ends of the outer peripheral surface of the magnet 30 on the diameter thereof.
Is slidably fitted in an axially extending elongated hole 21h formed in the outer peripheral surface of the socket 21 in correspondence with the pins 31, 31. Further, the magnet 30 is connected to the hole 21 through the spring 32.
Inserted into g. As a result, the magnet 30 cannot escape from the socket 21, can slide in the axial direction, and can enter and exit the hole 21g.

In addition, the socket 21 is provided with the flange 60b of the flange bolt 60.
It is only necessary for the main body 20 to have a slightly larger diameter than the outer diameter of the socket 21. Similarly, the main body 20 only needs to have a slightly larger diameter than the socket 21, so that the main body 20 can be configured to have a considerably smaller diameter.

The socket 21 is configured such that the base end 21a is
It is rotatably inserted in the inside and slidable in the axial direction.
Reference numeral 21b protrudes outward from the main body 20 through an airtight seal 27 which is fixedly fitted to the tip end 20b of the main body 20.

The nut runner 24 is mounted and fixed to the base end 20a of the main body 20 by a mounting member 28. The rotating shaft 33 is located inside the main body 20 and at the axial center, and the front end 33a has a rectangular cross section. The nut runner 24 is for rotating the socket 21, and its rotation shaft 33 is connected to a base end 21 a of the socket 21 via a drive shaft 34. The nut runner 24 is connected to the air source and is driven to rotate.

The drive shaft 34 has a proximal end 34a as shown in FIGS.
Has a columnar shape, and a front end 34b has a quadrangular prism shape. A square hole 34c that can be fitted to the front end 33a of the rotation shaft 33 of the nut runner 24 is formed in the end surface axis of the base end 34a. The proximal end 34a of the drive shaft 34 is airtightly fitted to the proximal end 20a of the main body 20 via a seal 35 in an air-tight, non-movable, and rotatable manner, and the distal end 34b is attached to the proximal end of the socket 21. Drilled square hole 2
1d is inserted and loosely fitted in the hole 21c with a slight gap,
In the square hole 34c of the base end 34b, the tip of the rotation shaft 33 of the nut runner 24 is provided.
33a is fitted. In this manner, the drive shaft 34 connects the socket 21 and the rotating shaft 33 of the nut runner 24 so that they cannot rotate with each other and the socket 21 can slide in the axial direction.

Returning to FIG. 2, the chuck mounting portion 22 is
A hole 22a into which the tip of the hole 21 can be inserted is formed, and a hole 22b is formed on one side of the hole 22a. The rear end of the hole 22b is connected to the parts feeder 12 (FIG. 1) via a joint 45 and a flexible hose 46. The chuck mounting portion 22, the joint 45, and the hose 46 constitute a bolt shooter. Also, the chuck mounting portion 22
Flange 22c formed at the rear end of rod 2 of cylinder 25
It is linked to 5a, and can move forward and backward. The cylinder 25 is a double-acting air cylinder, which is connected to the air source.

The chuck 23 is a half-split type constituted by two gripping portions 35 and 36 as shown in FIGS. 2, 3 and 5, and is provided at the tip of the chuck mounting portion 22 and on both sides of the hole 22a. The socket 21 is disposed so as to be spaced apart and opposed between the two so that the socket 21 can be inserted, and the front end is attached to be openable and closable via pins 37 and 38. The grips 35, 36 have their tips 35a, 36a reduced in diameter, and the shaft 60c of the bolt 60 in the closed state.
Can be clamped, and springs 39, 40 (third) are provided between the corner rear ends 35b, 36b and the flange 22c of the chuck mounting portion 22.
(Figure) is reduced. These springs 39, 40
A spring force for closing the tips 35a, 36a is applied to the grips 35, 36.

As shown in FIG. 3, the bolt automatic supply temporary tightening device 2 having the above-described structure includes the support members 4 attached to the front and rear ends of the present invention 20.
The robot 10 shown in FIG.
Attached to the arm 10a. The other bolt automatic supply temporary tightening device 3 has the same configuration as the automatic bolt supply temporary tightening device 2, and is attached to the arm 11 a of the robot 11.

 The operation will be described below.

A case where the oil pan 58 is screwed to the engine body 59 conveyed by the belt conveyor 1 as shown in FIG. 1 will be described.

First, the arm 10a of the robot 10 has moved to a position where the bolts are temporarily tightened first. Then, the bolt automatic supply temporary fastening device 2 is in an initial state as shown in FIGS. That is, air is supplied from the port 20d at the tip of the main body 20, the piston 26 retreats, and the socket 21 is stored in the main body 20 and shortened. Further, the cylinder 25 is extended to move the chuck mounting portion 22 forward. Then, the chuck 23 is in a closed state.

Next, the flange bolt 60 is connected to the parts feeder 12 (first
) Through the hose 46 and the chuck mounting part 22 to the chuck 23
Is sent by air. The flange bolt 60 is clamped with the tip of the shaft portion 60c slightly projecting from the tip of the chuck 23, that is, the tips 35a and 36a of the grips 35 and 36, and the flange 60b is fixed to the tip of each of the grips 35 and 36. It is held in a locked state by 35a and 36a.

Next, the cylinder 25 is shortened, and the chuck mounting portion 22 and the chuck 23 are retracted in the direction indicated by the two-dot chain line in the direction of arrow R in FIG. At this time, the flange bolt 60 gripped by the chuck 23 has the head 60a and the flange 60b fitted into the holes 21f and 21e at the tip of the socket 21, as shown in FIG.
In addition, the end face of the head 60a is attracted to the magnet 30. Further, the magnet 30 is appropriately pressed against the head 60a of the flange bolt 60 by the spring force of the spring 32. Thus, the flange bolt 60 is held in a state where its axis coincides with the axis of the socket 21. At this time, the tip of the shaft portion 60c of the flange bolt 60 is still clamped to the tip of the chuck 23.

Next, when air is supplied from the port 20c at the rear end of the main body 20, the piston 26 advances, the socket 21 advances in the direction of arrow F in FIG.
The grippers 35, 36 advance forward while spreading the tips 35a, 36a against the spring force of the springs 39, 40 of the grippers 35, 36, and protrude from the chuck 23. At the same time, the nut runner 24 rotates in the direction of tightening the flange bolt 60, that is, to the right. Thus, the socket 21 moves forward while rotating clockwise toward a predetermined screw hole of the engine body 59. At this time, the flange bolt 60 is held in a state where its axis coincides with the axis of the socket 21 as described above. That is, it is held vertically in the automatic bolt supply temporary fastening device 2 and horizontally in the automatic bolt supply temporary fastening device 3.

As a result, the flange bolt 60 penetrates the bolt hole of the oil pan 58 and is screwed into a predetermined screw hole of the engine body 59 (FIG. 1) to be temporarily tightened. The tightening torque at the time of this temporary fastening is extremely small, so that the flange bolt 60 attracted by the magnet 30 rotates together with the socket 21 without slipping inside the socket 21 and is temporarily fastened.

The socket 21 has such a pitch number that the flange bolt 60 does not fluctuate after the temporary tightening, and in particular, in the bolt automatic supply temporary tightening device 3, the number of pitches such that the temporarily tightened flange bolt 60 can maintain a horizontal state, for example, several pitches. Screw together. After temporary tightening,
The nut runner 24 of the bolt automatic supply temporary tightening device 2 stops,
At the same time, air is supplied from the port 20d at the front end of the main body 20, the socket 21 retreats, the cylinder 25 extends further, and the socket 21 returns to the position shown in FIG. Such an operation is performed in a short time of about several seconds.

Next, the next flange bolt 60 is
(FIG. 1) is supplied to the chuck 23. At the same time, the arm 10a of the robot 10 moves to a position where the flange bolt 60 is tightened next to the engine body 59, and the flange bolt 60 is temporarily tightened in the same manner as described above. This operation is repeatedly performed to temporarily tighten all bolts. The flange bolts 60 temporarily tightened in this manner are simultaneously tightened by the bolt tightening machine 4 with a predetermined tightening torque in the next final tightening step. The bolt tightening machine 4 is a simple nut runner and is inexpensive.

Further, if the used flange bolts have the same diameter, the bolts can be set on the work side even if the lengths, pitches, and the like differ depending on the model. Further, since the socket 21 is a thin rod and has a structure in which only the socket is advanced, it is possible to supply a bolt to a narrow portion. Bolt automatic supply temporary tightening device 3
The same applies to the bolt automatic supply temporary fastening device 2.

(Effects of the Invention) As described above, according to the present invention, a bolt is automatically supplied from a single socket to each screw hole of a work having a plurality of screw holes, and the screw is partially screwed in and temporarily tightened. A tightening device, wherein a shaft portion of a bolt supplied from a parts feeder to a first hole of a bolt shooter is supported by a chuck closed by a spring force, and the bolt shooter by the first cylinder is retracted and supported by the chuck. The head of the bolt is inserted into the round hole at the tip of the socket, adsorbed by the magnet, the bolt is transferred from the chuck to the socket, the second cylinder is advanced, the chuck is pushed open against the spring force, and the socket is advanced. The bolt is supplied to the screw hole of the work, and the socket is rotationally driven by the actuator, and the bolt attracted and held by the magnet is screwed into the screw hole. By temporarily screwing in the way and temporarily tightening, the bolt can be automatically supplied to the work and temporarily tightened, and the bolt tightening process of the assembly line can be automated. In addition, by controlling the socket in one axis, there is an effect that the socket can be used even if the fastening place is narrow and predetermined.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a bolt automatic supply and tightening system to which the automatic bolt supply and temporary tightening device according to the present invention is applied, and FIG. 2 is a diagram showing an embodiment of a bolt automatic supply and temporary tightening device according to the present invention. 3 is a sectional view taken along the line III-III of FIG. 2, FIG. 4 is an enlarged view of a main part of FIG. 3, and FIG.
6 and 7 show the operation of the bolt automatic supply temporary tightening device shown in FIG. 2, and FIG. 8 shows an assembly line using a conventional bolt automatic tightening machine. FIG. 9 is a view showing an outline, and FIG. 9 is a view showing a conventional bolt automatic supply and tightening device. 1 ... belt conveyor, 2, 3 ... automatic bolt supply temporary tightening device, 4-8 ... automatic bolt tightening device, 10, 11 ... robot, 12 ... parts feeder, 20 ... body, 21 ... Socket, 22 ... Chuck mounting part, 23 ... Chuck, 24 ...
Nut runner, 25 ... Cylinder, 30 ... Magnet, 3
5, 36 ... gripping part, 58 ... oil pan, 59 ... engine body, 60 ... flange bolt.

Continuation of front page (72) Inventor Shoji Shimada 3-5-55 Nishiiwata, Higashiosaka-shi, Osaka YOKOTA KOGYO CO., LTD. (56) References JP-A-59-102541 (JP, A) JP-A-59- 53133 (JP, A) JP-A-53-145200 (JP, A) Japanese Utility Model Application Sho 61-5537 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23P 19/06 B23P 19 / 00 301 B25B 23/04 B25B 23/10

Claims (1)

(57) [Claims] 1. A bolt automatic supply and temporary tightening device for supplying a bolt to each screw hole of a work having a plurality of screw holes by a single socket and screwing the bolt halfway to temporarily tighten the bolt. A round hole into which the head of the bolt is rotatably fitted at the tip with a rod shape slightly larger than the diameter,
A socket provided with a magnet which is non-rotatably accommodated in the round hole and which sucks and holds the head of the inserted bolt; a first hole through which the socket is inserted so as to be able to advance and retreat; A second hole joined to the tip of the hole and the other end connected to the parts feeder; a bolt shooter for supplying the bolt from the parts feeder to the first hole; A chuck that is openable and closable at the end of the hole and is closed by spring force and clamps a shaft portion of the bolt supplied from the parts feeder when closed; and supports the bolt shooter so as to be able to advance and retreat. At the time, the bolt is taken into the chuck from the bolt shooter, and the bolt clamped by the chuck is retracted into the round hole at the tip of the socket when retracted. A first cylinder to be transferred, connected to a proximal end of the socket, the socket is advanced after receiving the bolt, and the socket is pushed open by the socket against a spring force to advance the socket. A second cylinder that supplies a bolt to the screw hole; and a bolt that is connected to a base end of the socket and rotationally drives the socket to screw the bolt that is attracted and held by the magnet halfway through the screw hole. An automatic bolt supply temporary fastening device, comprising: