JPH0443736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bolt supply method for air-shunting bolts from a parts feeder device and supplying the bolts into a chucking case of a bolt supply tightening machine.

[Conventional technology]

In a conventional bolt supply tightening machine, after bolt tightening is completed, the bolt is moved from the bolt feeding section of the parts feeder device to the chucking case via the supply pipe by the operation of the limit switch, etc., at the retreating end of the tightening machine or during the retreat. The bolt was air shot inside.

[Problem that the invention seeks to solve]

With conventional bolt supply tightening machines, the next bolt is air-shunted from the parts feeder device after the previous bolt has been tightened, so it takes time to feed the next bolt into the chucking case. There was a problem. In particular, when tightening a large number of bolts in succession at a work site where the distance between the parts feeder device and the bolt supply tightening machine is several meters, the bolts are There was a problem in that there was a situation where the product was not supplied, resulting in a loss of working time.

Therefore, the present invention aims to eliminate the problem of the conventional example described above, that is, the loss of working time when tightening a large number of bolts in succession.

[Means for solving problems]

Therefore, in the present invention, when the bolt X in the chucking case 7 is close to completion of tightening, the mechanical valve 27 is turned on and emits an air signal, and this signal is detected to start air blowing.
Once from the bolt feeding section 37 to the supply pipe 31
Air-shut the next bolt X to the waiting point 34 in front of the supply port 32, and after tightening the bolt
When the stop of this signal is detected, the air cylinder 15 is activated, the bit 12 is moved backward, and the stopper plate 33 at the standby point 34 is opened. At the same time, the air blow is started, and the bolt is Air is shunted from the standby point 34 into the tracking case 7.

[Effect]

Since the next bolt is air-shunted to the standby point before the previous bolt is completely tightened, there is no longer a transfer time from the parts feeder device to the standby point than in the past, and there is no waiting time until the next bolt is supplied. Since it only takes the time from the point to the supply into the chuck case, the time has come to be significantly shortened. Further, since the bolts are supplied in a short time, even when a large number of bolts are to be tightened in succession, the bolts can be reliably supplied to the chucking case before starting the tightening work.

〔Example〕

The configuration of the bolt supply tightening machine used to implement the present invention will be described below.

In the figure, 1 is the handle part of the bolt supply tightening machine, the upper part is equipped with the hammer striking part 2 and the motor drive part 3, and the reverse lever 4 is installed below.
and a throttle lever 5 are connected in series, and a hose joint 6 for connecting an air hose is located at the bottom.
is installed. A tracking case 7 is provided in front of the hammer striking part 2 and is held by a front holder 8 and a rear holder 9. A bit 12 connected to the tip of an anvil 10 provided on the hammer striking part 2 by a pin 11 is inserted into the chucking case 7 with a spacer 13 and dry bearings 14a, 14b interposed therebetween.

An actuator A is installed above the bolt supply tightening machine, and an air cylinder 15 of the actuator A is provided from the upper end of the rear holder 9 to the rear. This air cylinder 1
Piston rod 16 that can freely move forward from 5
A positioning rod 17 with a spring 18 interposed therebetween is connected to the positioning rod 17.
The tip of is held at the upper end of the front holder 8.

A positioning cylinder 1 is attached to the upper end of the front holder 8 that holds the tip of the positioning rod 17.
As the piston 20 reciprocates within the positioning cylinder 19, the tip of the positioning rod 17 is restricted from moving forward from the front holder 8 by air pressure.

A bit box part 21 is provided at the tip of the bit 12, and this bit box part 2
A cushion spring 22 is provided inside the bit 12 at the rear of the bit 12, and a cushion pin 23 is provided at the tip of the cushion spring 22 so as to be freely retractable from the bit box portion 21. This movement of the cushion pin 23 is based on bit 1.
It is restricted by an elongated hole 24 provided in the axial direction in the cushion 2 and a stop pin 25 fitted to the rear end of the cushion 23.

An arm 28 is provided below the front holder 8 and has a mechanical valve 26 at the front end and a mechanical valve 27 at the rear end. The mechanical valve 27 is disposed so as to be freely protrusive and retractable from the fitting hole 29 into the tracking case 7, and the mechanical valve 27 is disposed so as to ride on the contact portion 30 at the bottom of the rear holder 9 as the tracking case 7 moves. .

Further, a supply pipe 31 is connected to one side of the chucking case 7, and its supply port 3
A stopper plate 33 is attached to the bolt 2, and the rear of the stopper plate 33 is used as a standby point 34 for the bolt, and a pawl 35 for preventing the bolt from returning is provided behind it. In addition, chuck claws 36 are provided on both sides of the tip of the chuck case 7.

Therefore, the bolt supply method of the present invention will be explained based on the bolt supply and tightening machine configured as described above.

First, pull the throttle lever 5 of this bolt supply tightening machine to turn on the throttle valve S, and press the handle part 1 against the tracking case 7 (at this time, air pressure is applied to the positioning cylinder 19). ), the mechanical valve 26 can be pushed onto the bit 12 surface.
Switch to ON. In addition, chatting case 7
Push the handle part 1 to the side, make the mechanical valve 27 at the rear end of the arm 28 ride on the contact part 30 at the bottom of the rear holder 9, and switch it to ON.
(See FIG. 3.) Air blowing is then started to air-shute the bolts X from the bolt feeding section 37 of the parts feeder device to the standby point 34.
(See FIG. 4.) Thereafter, the air blow is automatically stopped by the operation of the timer valve 38.

Next, the mechanical valve 27 is turned OFF by stopping the pressing of the handle part 1 against the chucking case 7 side and returning the handle part 1 to its original position by the elasticity of the spring 18. Then, air is allowed to flow into the air cylinder 15 to move the piston rod 16 forward. At this time, since air pressure is acting on the positioning cylinder 19, the bit 12 moves back together with the handle part 1, opens the stopper plate 33, and simultaneously starts air blowing and is sent to the waiting point 34. Air shoot the bolt X into the tracking case 7. (See Fig. 6.) Advance the piston rod 16 to the final position, insert the mechanical valve 26 into the chuck case 7 through the insertion hole 29, and turn it OFF.
The air circuit of the air cylinder 15 is switched, the piston rod 16 is moved backward, and the stopper plate 33 is moved back.
While closing the bolt, set the bolt X to the chuck pawl 36 at the tip of the chuck case 7.
Incidentally, at this time, the mechanical valve 26 again rides on the bit 12 surface and is turned ON. (Second
As shown in the figure. ) Then, by checking the tightening position of the bolt and pressing the tip of the bolt X set in the chuck pawl 36 against the tightening surface, the cushion pin 23
overcame Kutsuyon Spring 22 and retreated,
The tip of bolt X sinks into the tracking case 7.
Then, the throttle lever 5 is pulled to turn on the throttle valve S, which generates an impact rotational force in the hammer striking part 2, rotates the bit box part 21, and tightens the bolt X.

When the tightening is completed, the mechanical valve 27 rides on the abutting portion 30 at the bottom of the rear holder 9 at the final pressing position and is turned ON, and the above operation is repeated again. In this way,
The bolt X is continuously tightened.

Next, the operating state of the bolt supply tightening machine using the method of the present invention will be explained according to the air circuit diagram shown in FIG.

First, as shown in Fig. 3, when the mechanical valve 27 rides on the contact part 30 at the bottom of the rear holder 9 and is turned ON, the air signal passes through circuit A and reaches circuit B, turning the air valve I into Since the air valve J is switched to the position a, air flows into the circuit C, and the air valve J is switched to the a position and this state is maintained. At this time, the mechanical valve 26 rides on the surface of the bit 12 and is turned on, switching the air valve C to position b.

Further, the air signal that has reached circuit D through circuit A switches air valve M to position b, and air passes through throttle valve 39 and is blown out as an air blow.
At the same time, the bolt feeding section 37 of the parts feeder device
The bolt forward feed cylinder O is pushed up, and the bolt X is air-shunted to the standby point 34. Further, the air signal that has reached circuit E through circuit A switches air valve K to position b, activates timer valve 38, and switches air valve L to position b after a set time has elapsed. Then, air valve L
The air that has passed through passes through the circuit and switches the air valve M to position a, so that the bolt sequential feed cylinder P of the bolt pressure feeding section 37 is pushed up, and at the same time, the bolt sequential feed cylinder O is lowered. Through this operation, the bolts X are fed one by one and air-shutted. Then, some of the air that has passed through air valve M passes through circuit A and air valve K.
Since the air valve L of the timer valve 38 is switched to the a position, the air valve L of the timer valve 38 is switched to the a position.

Next, when the mechanical valve 27 is turned off as shown in FIG.
Since the air valve J is switched to the position a, the air that has passed through the circuit Q passes through the air valve J, which is still switched to the a position, and enters the circuit R. Then, the air valve E is switched to the a position to allow air to flow into the air cylinder 15, and the piston rod 16 is moved forward. Then, some of the air that has passed through the air valve E passes through the circuit and switches the air valve F to the a position, so that air pressure acts on the piston 20 of the positioning cylinder 19 and fixes the positioning rod 17, so that the handle part 1
retreats. As the handle part 1 moves back, the bit 1
2 also moves backward, so the stopper plate 33 is opened. The air that has passed through the air valve J and entered the circuit N switches the air valve N to position b, so the air that has passed through the air valve N passes through the throttle valve 40 and starts air blowing, causing the bolt Air shoot to.

When the piston rod 16 moves forward to the final position, the mechanical valve 26 is turned OFF, so the air valve C is switched to the a position, and the air that has passed through the air valve C passes from circuit W to circuit W, switching the air valve E to the b position. Then, air flows into the air cylinder 15 and the piston rod 16 is retracted. At this time, the positioning rod 17 is fixed by the action of air pressure on the piston 20 of the positioning cylinder 19. Then, the bolt X that has entered the chuck case 7 is pushed to the tip of the chuck case 7 by the bit box part 21 and set in the chuck claw 36.

〔Effect of the invention〕

This invention is constructed as described above, and the time from the completion of tightening of the most recent bolt to the supply of the next bolt into the chucking case is significantly shortened, so that a large number of bolts can be continuously tightened. Even when tightening by hand, there is no loss of working time, and it has an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the bolt supply tightening machine used in the method of this invention when the mechanical valve is turned OFF and ON, and Fig. 2 is a partially cutaway side view of the state shown in Fig. 1. The plan view, Fig. 3 is a partially cutaway side view when the mechanical valve is turned on from the state shown in Fig. 1, and Fig. 4 is a partially cutaway side view.
The figure is a partially cutaway plan view of the state shown in Fig. 5.
The figure is a partially cutaway side view of the bolt supply tightening machine used in the method of this invention when the piston rod is advanced to the final position, Figure 6 is a partially cutaway plan view of the state shown in Figure 5, and Figure 7 1 is an air circuit diagram for carrying out the method of the present invention. 1...Handle part, 7...Chatting case, 1
2...bit, 15...air cylinder, 16...mechanical valve, 27...mechanical valve, 3
DESCRIPTION OF SYMBOLS 1... Supply pipe, 32... Supply port, 33... Stopper plate, 34... Standby point, 37... Bolt pressure feeding part, X... Bolt.

Claims (1)

[Claims] 1 A method of supplying bolts X from the bolt feeding section 37 of the parts feeder device through the supply pipe 31 into the chucking case 7 of the bolt supply tightening machine, in which the bolts X in the chucking case 7 are tightened. When nearing completion, mechanical valve 27
It switches to ON and issues an air signal, detects this signal and starts air blowing, and once air shoots the next bolt After tightening the bolt 15 is activated, the bit 12 is moved backward, and the stopper plate 33 at the standby point 34 is opened, and at the same time air blowing is started to air shoot the bolt X from the standby point 34 into the tracking case 7. Features: Bolt supply method in bolt supply tightening machine.