JPH06218638A - Prevention of suction mistake for part and screw part - Google Patents

Abstract

PURPOSE:To improve quality by preventing the suction mistake and part fault by carrying out the check for the degree of vacuum before the suction working, as for a working device which carries out working through the vacuum absorption for a screw, etc. CONSTITUTION:When a vacuum generator 30 operates, the vacuum level in a suction passage 31 is detected by a vacuum sensor 52. When the vacuum level is at a prescribed value, e.g. below 310mmHg, the second judging circuit 62 outputs a stop signal to the control circuit 4c of a tightening device 4, and tightening work is suspended after one cycle. When each value of the first judging circuit 61 and the second judging circuit 62 which output the judgement result in relation to the vacuum level detected by a vacuum sensor 61 into a control circuit 8 for an X-Y type robot 70 exceeds a standard value, a series of tightening operations are carried out. When tightening is suspended at the value below the standard value, an alarm is outputted. On the basis of the alarm, a filter 32 and a suction passage 31 are cleand, and work is restarted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component suction error prevention method and a screw component suction error prevention device when a screw or other component is vacuum-sucked and screw tightening or other processing is performed.

[0002]

2. Description of the Related Art In a conventional suction-type automatic screw tightening device and other vacuum suction-type processing devices, a vacuum generating device 30 for connecting screws and other parts via a filter 32 and a suction path 31 shown in FIG. 4 is generated. It was gripped and clamped by vacuum suction, or processed.

[0003]

In the above-mentioned conventional apparatus, dust on the surface of the screw and dust generated by the processing of parts such as scraps of the mating parts generated when tightening the screws are generated in the filter 32 and the suction path 31. There is a problem that it adheres to the gaps of pipes, valves, etc. and gradually accumulates, the vacuum suction force decreases, suction mistakes occur, screws and other parts at certain parts of the work become out of stock, and poor quality occurs. There was

Therefore, the present inventors have paid attention to the first technical idea of the present invention of checking the degree of vacuum for adsorbing an article before fastening a screw and processing other articles, and By focusing on the second technical idea of the present invention that machining is stopped when a suction error other than a certain value may occur, and as a result of further research and development, it is possible to prevent the suction error of parts. The present invention has been achieved which achieves the object of preventing defective parts in a work and improving quality.

[0005]

According to a method of preventing a component suction error of the present invention (the first invention according to claim 1), a component is vacuum-sucked and processed in a processing apparatus for suctioning and processing the component. First, the degree of vacuum for sucking the parts is checked.

A screw component suction error prevention device of the present invention (a second invention according to claim 2), a screw transport device for transporting a screw, a suction pipe for suctioning the transported screw, and a suction pipe for transporting the screw. Vacuum suction device that vacuum-sucks the inside of the suction pipe via the suction path to set the screw by suction.
A screwing device that tightens the screw set in the suction pipe with a driver that moves up and down and rotates, a vacuum sensor that is installed in the suction path and detects the vacuum level in the suction path, and a vacuum sensor detects And a discrimination circuit for discriminating whether or not the vacuum level exceeds a reference value.

A screw component suction error prevention device of the present invention (the third invention according to claim 3) is a screw transport device for transporting a screw, a suction pipe for suctioning the transported screw, and a suction pipe for transporting the screw. Vacuum suction device that vacuum-sucks the inside of the suction pipe through the suction path for suction setting of the set screw, and a fastening device that fastens the screw set in the suction pipe by a driver that moves up and down and rotates. And first and second vacuum sensors arranged in the suction path to detect the vacuum level in the suction path, and an alarm if the vacuum level detected by the first vacuum sensor is less than or equal to a first reference value. A first discriminating circuit that outputs a signal and outputs a movement signal for moving the fastening device to a stop position by a moving mechanism, and a vacuum level detected by a second vacuum sensor is the first reference value. Yo For less high second reference value,
A second discriminating circuit that outputs an alarm signal and outputs a stop signal for stopping the fastening device after being driven for one cycle, and a moving signal from the first discriminating circuit to move the fastening device to the stop position. And a moving mechanism for moving.

[0008]

According to the first embodiment of the component suction error prevention method having the above structure, the degree of vacuum for sucking a component is checked before the component is sucked and processed by the processing device.

The screw component suction error prevention device of the second aspect of the present invention having the above structure conveys the screw by the screw conveying device,
The vacuum sensor installed in the suction path detects the vacuum level in the suction path before the suction pipe sucks the screw conveyed by the vacuum suction device through the suction path. It is determined whether the vacuum level exceeds the reference value, and if it exceeds the level, the screws conveyed by the vacuum suction suction pipe are sucked and the screw set in the suction pipe is moved up and down by the driver of the fastening device. It is moved and rotated to be fastened to the work.

The screw component suction error prevention device of the third aspect of the present invention having the above structure conveys the screw by the screw conveying device,
The vacuum level in the suction path is detected by the first vacuum sensor arranged in the suction path before the screw conveyed by the suction pipe vacuum sucked by the vacuum suction device is sucked by the suction pipe. When the vacuum level detected by the first determination circuit is less than or equal to the first reference value, an alarm signal and a movement signal are output, and the vacuum level detected by the second vacuum sensor is determined by the second determination circuit. When the second reference value is higher than the first reference value and is equal to or less than the second reference value, an alarm signal and a stop signal are output, and the moving mechanism moves the fastening device to the stop position based on the moving signal. When the stop signal is output from the determination circuit of No. 2, the fastening device is stopped.

[0011]

As described above, the first embodiment of the component suction error prevention method of the present invention checks the degree of vacuum before the component suction processing, so that the possibility of suction error can be grasped in advance and the suction error can be grasped. You can prevent mistakes,
This has an effect of preventing product shortage in the work and improving quality.

In the suction error preventing device for screw parts of the second aspect of the present invention, when the vacuum level detected by the vacuum sensor does not exceed the reference value, the determination circuit outputs a signal to indicate the possibility of suction error. This can be grasped in advance, and the suction error can be prevented, and the operation of the driver of the fastening device is stopped, so that there is an effect that a screw-out item in the work is prevented and the quality is improved.

In the suction error preventing device for screw parts of the third aspect of the present invention having the above-mentioned operation, when the vacuum level detected by the first vacuum sensor is less than the first reference value, the fastening device moves to the stop position. When the vacuum level detected by the second vacuum sensor is equal to or lower than the second reference value which is higher than the first reference value, the fastening device is stopped after being driven for one cycle, so that a suction error is prevented. As a result, it is possible to prevent screw shortages in the work, improve the quality, and respond to the detected vacuum level, and also to respond to the vacuum level. .

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A screw component suction error prevention method and a screw component suction error prevention device (hereinafter simply referred to as a screw component suction error prevention device) of the first embodiment are shown in FIGS. As shown in the drawings, it is the embodiment of the first to third inventions, and the screw conveying device 1 for conveying the screw by the chute 15, the suction pipe 2 for sucking the conveyed screw, and the upper part of the suction pipe 2 are connected. The suction pipe 2 is sucked through the suction passage 31, and the vacuum suction device 3 provided with the filter 32 is coaxially arranged above the suction pipe 2 and arranged at the lower end so as to be rotatable and vertically movable. Fastening device 4 having driver 41 installed, and vacuum suction path 31
First and second vacuum sensors 51 and 52 arranged in a room communicating with the first and second discrimination circuits 61 and 62 respectively connected to the first and second vacuum sensors.
And a moving mechanism 7 composed of an XY robot 70 that holds the fastening device 4, and a control circuit 8 that outputs a control signal to the moving mechanism 7 based on a signal from the discriminating circuit 61.

The carrier device 1 is a rail support 1 in which screws are obliquely supplied from a hopper 14 which accommodates a large number of screws.
The chute 15 composed of a chute rail 15R and a pressing plate 15P supported by 5C sequentially conveys the screws to the catcher 2C that constitutes the suction pipe 2.

The fastening device 4 is provided with a drive motor 44 arranged so as to be vertically movable by a catcher lifter 46 with respect to a base 4B fixed to a side portion of the robot 70, and a drive motor 44.
A driver 41 which is inserted into a lower part of a case body 43 which is integrally arranged in the lower part of the case and is rotationally driven by a drive motor 44 through a drive shaft; and a driver 41 which is inserted and arranged in a lower part of the case body 43. And a thin tube 45 that has been formed.

Like the chute rail 15R, the suction pipe 2 is constituted by a catcher 2C constituted by a tube 45 supported by the base 4B, and a chute is provided through an opening 20 as shown in FIGS. 2 and 3. It is composed of an L-shaped receiving portion 2R that receives a screw supplied from the rail 15R.

In the vacuum suction device 3, as shown in FIGS. 4 and 5, the suction pump is rotated by the compressed air controlled by the control valve based on the source pressure control sensor from the compressed air source 30A to generate the vacuum. Device 30
And a filter 32 that separates the central portion 32C and the outer peripheral portion 32P, which are connected to the vacuum generating device 30, by an annular filter element 32E, one end of the filter 32 is connected to the outer peripheral portion 32P, and the other end of the case main body 43 is connected. And a suction path 31 formed by a hose 31H connected to the lower part.

First and second vacuum sensors 51, 52
Is a digital pressure sensor, and the suction path 31
It is arranged at an appropriate place inside and can detect the vacuum level.

The first discriminating circuit 61 discriminates whether or not the vacuum level detected by the first vacuum sensor 51 is, for example, above or below the first reference value of 300 mmHg, and the filter 32 and the hose 31H are free from dust. Is attached and accumulated,
When the vacuum level is less than 300 mmHg, an alarm signal is output and the lamp is turned on, and a stop signal is output to the control circuit 8. When it is 300 mmHg or more, a movement signal to move to the work position of the work is output. To do.

The second discriminating circuit 62 uses a second reference value of 310 mmHg at which the vacuum level detected by the second vacuum sensor is higher than, for example, the first reference value (300 mmHg).
If it is less than 310 mmHg, it is highly likely that a screw suction error will occur.
After the cycle ends, a stop signal for stopping the fastening device 4 is output to the control circuit 4C.

The control circuit 8 is composed of a robot controller and outputs coordinate signals corresponding to the work position and the stop / retract position in accordance with the signal output from the first discriminating circuit 61.

The moving mechanism 7 is composed of an XY robot 70, and based on the coordinate signal from the control circuit 8 according to the vacuum level detected by the first vacuum sensor, the working position and the stop of the work. The fastening device 4 is moved to the retracted position.

In the screw component suction error prevention device of the first embodiment having the above-described structure, when the vacuum generating device 30 operates as shown in the flow chart of FIG. When the vacuum level of the suction path 31 detected by the vacuum sensor 52 is less than 310 mmHg, the second determination circuit 62 sends a stop signal to the control circuit 4 of the fastening device 4.
Since it is output to C, the fastening device 4 stops after one cycle of fastening work. The first and second discriminating circuits 61,
If both 62 exceed the reference value, the series of operations shown in FIG. 8 is performed.

Further, the apparatus of the first embodiment detects the vacuum level of the suction path 31 vacuum-sucked by the vacuum suction device 3 by the first vacuum sensor 51, and the first discriminating circuit 61.
Is less than 300 mmHg, and if the result of dust adhering and accumulating on the filter 32 or the like is less than 300 mmHg, a stop signal is output, the control circuit 8 outputs a stop coordinate signal based on the stop signal, and X of the moving mechanism 7 is output. The Y-shaped robot 70 moves the fastening device 4 to the stop coordinate position.

In the device for preventing the screw component suction error of the first embodiment having the above-described operation, the filter 32 and the suction path 31 are provided.
If the vacuum level drops due to the accumulation of dust inside the
And detected by the second vacuum sensors 51 and 52,
The first and second discriminating circuits 61 and 62 are compared with the first and second reference values, and if less than the reference value, it is determined that there is a high possibility that a screw 41 in the suction pipe 2 has a suction error with respect to the driver 41, and the screw is moved. Since the fastening device 4 is stopped while the mechanism 7 is moved to the stop position, there is an effect that a suction error is prevented, a screw missing piece in a work is prevented, and quality is improved.

Further, in the apparatus of the first embodiment, it is possible to know the accumulation and accumulation of dust beyond the allowable value by the alarm signals of the discrimination circuits 61 and 62 and the stop of the apparatus, so that the filter 32, the suction path 31 and the like are cleaned. By doing
The effect that the normal operation can be resumed is achieved.

(Second Embodiment) The screw component suction error prevention device of the second embodiment uses a digital setting type pressure switch instead of the digital type pressure sensor of the first embodiment, and the discrimination circuit is set to the above pressure. Since the switch is changed so as to determine whether the switch is on or off, the vacuum level can be easily set and changed, and other effects similar to those of the first embodiment can be obtained.

The embodiments described above are merely examples for the purpose of explanation, and the present invention is not limited to them. Those skilled in the art will recognize from the claims, the detailed description of the invention and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.

In the first embodiment described above, the vacuum sensor is the first
The example in which two of the second vacuum sensors 51 and 52 are used has been described, but the present invention (first and second inventions) is described.
However, the vacuum level detected by one vacuum sensor may be determined based on different first and second reference values in the first and second determination circuits. Is.

In the above embodiment, the XY type robot is explained as an example of the moving mechanism, but the present invention can also be applied to a scalar type or a joint type robot, and it is possible to move other than the robot. Special purpose machines are also available.

[Brief description of drawings]

FIG. 1 is a perspective view showing a device according to a first embodiment of the present invention.

FIG. 2 is a side view showing a fastening device and a screw conveying device of the first embodiment device.

FIG. 3 is a partially enlarged side view showing a catcher and a chute rail of the first embodiment device.

FIG. 4 is an air circuit diagram showing the vacuum suction device and other components of the first embodiment device.

FIG. 5 is an exploded perspective view showing the filter of the first embodiment device.

FIG. 6 is a block diagram showing an overall system of a first embodiment device.

FIG. 7 is a chart showing the operation flow of the first embodiment device.

FIG. 8 is a diagram showing an operating state during normal operation of the device of the first embodiment.

[Explanation of symbols]

 1 Screw Transfer Device 2 Suction Pipe 3 Vacuum Suction Device 4 Tightening Device 14 Hopper 15 Chute 30 Vacuum Generation Device 31 Vacuum Suction Path 32 Filter 4B Base 41 Driver 43 Case Body 44 Drive Motor 45 Tube 46 Catcher Lift 2C Catcher 2R Receiver 50 Compressed air source 51 First vacuum sensor 52 Second vacuum sensor 61 First determination circuit 62 Second determination circuit 7 Moving mechanism 70 XY robot 8 Control circuit

Claims (3)

[Claims] 1. A method for preventing a component suction error, which comprises: in a processing device for vacuum suctioning and processing a component, checking the degree of vacuum for suctioning the component before suctioning and processing the component. 2. A screw transport device for transporting a screw, a suction pipe for suctioning the transported screw, and a vacuum suction through the suction pipe for suction setting of the screw transported in the suction pipe. A vacuum suction device, a fastening device that fastens a screw set in the suction pipe with a driver that moves up and down, and a vacuum sensor that is provided in the suction path and detects the vacuum level in the suction path. A device for preventing a screw component from being sucked by mistake, comprising a determination circuit for determining whether or not the vacuum level detected by the vacuum sensor exceeds a reference value. 3. A screw conveying device for conveying a screw, a suction pipe for sucking the conveyed screw, and a suction pipe for vacuum-sucking the suction pipe to set the screw conveyed in the suction pipe by suction. A vacuum suction device, a fastening device that fastens a screw set in the suction pipe by a driver that moves up and down, and a screw that rotates, and a first device that is provided in the suction path and detects a vacuum level in the suction path. When the vacuum level detected by the first vacuum sensor and the second vacuum sensor is less than or equal to the first reference value, an alarm signal is output and the moving mechanism moves the fastening device to the stop position. When the vacuum level detected by the first discriminating circuit that outputs the movement signal and the second vacuum sensor is equal to or lower than the second reference value that is higher than the first reference value, an alarm signal is output and the A second discriminating circuit for outputting a stop signal for stopping the fastening device after being driven for one cycle; and a moving mechanism for moving the fastening device to the stop position in response to a movement signal from the first discriminating circuit. A device that prevents screwing mistakes of screw parts.