JPS638112A - Chip conveyer - Google Patents

Abstract

PURPOSE:To make it possible to automatically carry out recovery motion even though chips clog, by providing an overload detecting means for detecting an overload of a conveyer so that the conveyer is stopped in accordance with a detection signal from the overload detecting means and thereafter is reversed for a predetermined time before it is normally rotated again. CONSTITUTION:A conveyer body 1 is driven by a motor 2 while a switch 3 is operated by a control device 4. Further, a detector 5a for detecting an overload of the motor 2 is disposed between the motor 2 and the switch 3. During normal operation of the conveyer 1, when chips clog to cause an overload condition, the detector 5a changes over the operation of the conveyer from its normal operating phase into its reverse operating phase. Further after a predetermined time elapses, the conveyer 1 is returned into the normal operating phase. In this condition if the clogging of chips is not remedied, the reverse operating phase and the normal operating phase are repeated. If the clogging cannot be remedied through the above-mentioned recovery operation is made for a predetermined time, the motor 2 is stopped.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a chip conveyor that is attached to a machine tool and collects chips (hereinafter referred to as chips) discharged from the machine tool;
In particular, the present invention relates to a chip conveyor equipped with an automatic recovery function when the chip is clogged and stopped.

(Prior Art) In recent years, machine tools have been rapidly increasing in speed and automation, and along with this, the development and improvement of associated equipment has been progressing in various fields.

As a link to this, a so-called chip conveyor has been developed and is currently in use, which uses a conveyor to automatically discharge chips discharged during machining by a machine tool from a chip collection point of the machine tool.

However, there are cases where chips become clogged at the input bag input portion to the chip conveyor or the input portion from the chip conveyor to the chip collection box, resulting in an overload on the chip conveyor.

In such cases, conventionally, from the viewpoint of preventing motor burnout, a torque limiter and a slip detection device have been attached to the drive part of the chip conveyor to automatically stop the chip conveyor, and then the operator can rotate the chip conveyor in the forward or reverse direction. This refers to forward and reverse rotation (same in this specification) to unclog the chip and restart (recovery) it.

(Problem to be solved by the invention) However, as the automation of the above-mentioned machine tools has progressed further, their prices have become extremely expensive, and the pace of progress has been rapid. In order to shorten this period, machine tool operators are increasingly operating automatically at night when they have returned home.

If a chip becomes clogged during automatic operation at night, the machine tool must automatically stop and remain in that state until the next morning when an operator is dispatched, which reduces the operating rate of the expensive machine tool. As a result, the amortization period is extended, resulting in a large economic loss for the user.

The present invention was made in view of the above-mentioned current situation, and an object of the present invention is to provide a chip conveyor that can automatically recover even when the chip conveyor is clogged with chips.

(Means for Solving the Problems) The chip conveyor according to the present invention includes a conveyor body including a driving means, an electric switch that performs forward/reverse rotation and stopping of the conveyor by switching/intermittent electrical connection, and the electric switch. A chip conveyor having a control device for controlling switching/discontinuation of connections, and an overload detection means for detecting an overload of the conveyor, the control device controlling or measuring the time length of each operation. and performs a series of recovery operations in which the conveyor is stopped based on the detection signal of the overload detection means, the conveyor is reversed for a predetermined period of time, then stopped, and then the conveyor is rotated forward, and the detection means determines whether there is an overload. If the overload is still present, the system instructs the timing means to repeat the series of recovery operations such as stopping and reversing until the value measured by the recovery operation elapsed time reaches a predetermined value. The present invention is characterized by comprising a control means that instructs to cut off the power to the drive means and issue an alarm signal as necessary, without repeating the recovery operation when the elapsed time reaches a predetermined value.

(Function) The chip conveyor with the above configuration automatically stops and reverses the conveyor when chips are clogged and an overload is applied to the conveyor to eliminate the chip jam and restore the conveyor function. recover automatically. Furthermore, if the clumping of chips is not resolved after a predetermined period of time or more even after the recovery operation, the drive power for the conveyor is cut off to prevent the drive source from burning out. It also issues an alarm signal as necessary to notify an emergency stop of the conveyor.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an overall configuration diagram of a chip conveyor according to the present invention,
Figure 2 is an electrical circuit diagram showing the circuit configuration of the control device;
The figure is a flowchart showing the control details and procedures of the chip conveyor.

First, the overall structure of the chip conveyor according to this embodiment will be explained based on FIG. Electricity is supplied from a power source 7 via an electric switch 3 for forward and reverse rotation and stop, and this electric switch 3 is configured to be switched between forward and reverse rotation or to be switched on and off by a control device 4. Furthermore, a detector 5a of a lock relay 5 is interposed between the electric motor 2 and the electric switch 3 to detect an overload (rapid increase in current) of the electric motor 2, and a control device 4 is provided with a conveyor recovery operation. An alarm buzzer 6 is connected to inform the user that the device is disabled.

FIG. 2 shows one embodiment specifically showing the configuration of the control device 4, and in this embodiment, it is constructed of an electrical sequence circuit that operates as shown in the flowchart of FIG. . That is, this sequence circuit is
When you press the start pushbutton switch, Chi PBI, the magnetic contactor MSF
A current flows, the magnetic contactor contact MSF in this circuit and the main contact MSF of the magnetic contactor close, a circuit for the normal rotation side of the electric switch 3 of the motor 2 is formed, and the conveyor enters the normal rotation operation state. . In this state, the shock relay 5 for overload detection and the indicator lamp PL are in a energized state and are in a state where overload state detection is possible.

When the chip conveyor is clogged with chips and becomes overloaded during normal rotation of the conveyor, the current flowing through the motor 2 increases. When an overcurrent exceeding a set value flows through the electric motor 2, a current is generated in the secondary coil side of the detector 5a of the shock relay 5, and the shock relay 5 is activated to close its relay contact S.
1 is closed, and the relay C is connected in series with the contact S1.
Current flows through R2. As a result, relay contact CI? 2 is closed, and the relay CI?2 is connected in series with the relay contact C112. 3. Current flows to the forward/reverse timer Ti1l and the recovery operation limit timer TR2, and the electromagnetic contactor MSR
Relay contacts CR3 and relay C1 are connected in series to
The relay contact CR3 connected in series to the magnetic contactor MSR, the recovery operation limit timer contact TR2 directly connected to the magnetic contactor MSR are closed, and the forward/reverse timer time limit contact TI? connected in series to the magnetic contactor MSR is closed. 1 and the recovery operation limit timer time limit contact TR2 operate with a time delay.

As a result, current flows through the electromagnetic contactor MSR, and the main contact MSR of the electromagnetic contactor MSH closes, and the electromagnetic contact MS
Auxiliary contact of a magnetic contactor connected in series with N) IS
Since R is opened, the conveyor changes from a normal rotation operating state to a reverse rotation operating state. In such a state, the forward/reverse timer T
The circuit of RI and recovery operation limit timer TR2 is in a closed state (energized state).

However, after a predetermined period of time has elapsed, the electromagnetic contactor MSI?
The time limit contact TRI of the normal rotation timer TRI and the time limit contact TR of the recovery operation limit timer TR2 are connected in series with the normal rotation timer TRI.
2 opens, the time limit contact TI? of the forward/reverse timer TRI, which is connected in series with the electromagnetic contactor plate F, opens. 1 closes, the current in the magnetic contactor MSR is cut off, and current flows in the magnetic contactor MSF, causing the conveyor to shift from a reverse rotation state to a normal rotation state.

In this state, if the shock relay 5 does not detect an overload state, that is, if the shock relay 5 has recovered from the chip clogging, the relay CR2 does not operate, so normal rotation operation is maintained.

On the other hand, if the shock relay 5 still detects an overload condition, the relay CR2 is activated again and the conveyor performs a series of recovery operations of reverse rotation and forward rotation according to the above procedure. Then, until the overload state of the shock relay 5 is no longer detected, the recovery operation limit timer TI? If the above-mentioned recovery operation operation is continued within the set time of 2, and an overload condition is still detected at the end of the set time, the recovery operation limit timer TR is activated.
The series of recovery operations described above is stopped by the time-limited operation of step 2. That is, the magnetic contactor MSI? The recovery limit timer TI? is connected in series with the recovery limit timer TI? 2 time limit contact TR2 opens and relay C
The time limit contact of the recovery limit timer TR2 connected in series to RI closes, and the electromagnetic contactor MSF and electromagnetic contactor) 1
Since both the currents in sR are cut off, both main contacts are open and the motor 2, ie the conveyor, is stopped. Also, contact CR of relay CR2 connected in series to alarm buzzer 6
2 closes and the alarm buzzer sounds.

Therefore, even if the chip clogging is not cleared, the electric motor of the conveyor will not be burnt out.

In the above embodiment, the control device is constituted by an electric sequence circuit using an electromagnetic contactor, a relay, a timer, etc., but instead of these, as shown in FIG. 4, a microcomputer for controlling the chip conveyor is used. (or a computer installed in the machine tool)
A control device may be configured by incorporating a program into a storage unit to perform control as shown in the flowchart shown in the figure. In such a case, the clock function, arithmetic function, and memory function provided in the computer can be used as timing means and control means.

(Effects of the Invention) As explained above, the present invention has an automatic recovery function that automatically unclogs the chips even if they become clogged, and automatically recovers the chip conveyor. It also becomes possible to operate machine tools automatically.

As a result, the depreciation period for expensive machine tools can be shortened, resulting in a large economic ripple effect. Furthermore, if it is impossible to automatically unclog the chip, the system is configured to issue an alarm and automatically shut down, so there is no risk of burning out the motor and causing a fire.

[Brief explanation of drawings]

FIG. 1 is a schematic overall configuration diagram of the chip conveyor according to the present invention, FIG. 2 is an electric circuit diagram showing the circuit configuration of the control device,
FIG. 3 is a flowchart showing the control contents and procedures of the same Chisobukonhair, and FIG. 4 is a schematic overall configuration diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1... Conveyor body, 2... Electric motor, 3... Electric switch, 4... Control device, 5... Shock relay 1.5a... Detector, 6... Alarm buzzer, 7...
power supply. Drawing 1 Drawing 4 Drawing W2 Drawing Otsu Z] Procedural amendment - issued) July 24, 1985 1, Indication of the case 1985 Patent Application No. 1492
No. 64 No. 2. Title of the invention: Chip conveyor 3. Relationship with each case for amendment Patent Representative: Yoshihoro Matsumoto 4, Agent: 650 5. Date of amendment order: Showa year, month, day, day Specification 10 Invention Name: Chip Conveyor 2, Claims A conveyor body equipped with a driving means, an electric switch that controls forward/reverse rotation and stop of the conveyor by switching/intermittent electrical connection, and switching/intermittent connection of the electric switch/notch. A chip conveyor comprising a control device for controlling intermittent operation and an overload detection means for detecting an overload of the conveyor, the control device comprising a timing means for controlling or measuring the time length of each operation, and a timing means for controlling or measuring the time length of each operation, A series of recovery operations are performed in which the conveyor is stopped based on a detection signal from the load detection means, the conveyor is reversed for a predetermined period of time, then stopped, and then the conveyor is rotated in the forward direction, and the detection means determines whether or not there is an overload;
If the overload is still present, an instruction is given to repeat the series of recovery operations such as stopping and reversing, until the value measured by the timing means of the recovery operation elapsed time reaches a predetermined value. A chip conveyor characterized in that it has a control means for instructing to cut off the power to the drive means without repeating the recovery operation when the value reaches the value, and to issue an alarm signal as necessary. 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a chip conveyor that is attached to a machine tool and collects chips (hereinafter referred to as chips) discharged from the machine tool;
In particular, the present invention relates to a chip conveyor equipped with an automatic recovery function when the chip is clogged and stopped. (Prior Art) In recent years, the speed and automation of machine tools have progressed dramatically, and along with this, the development and improvement of associated equipment is progressing in various fields. As a link to this, a so-called chip conveyor has been developed and is currently in use, which uses a conveyor to automatically discharge chips discharged during machining by a machine tool from a chip collection point of the machine tool. However, the chip conveyor may be overloaded due to clogging of chips at the bucket portion into which the chips are fed into the chip conveyor or the portion where the chips are fed from the chip conveyor into the chip collection box. In such cases, conventionally, from the viewpoint of preventing motor burnout, a torque limiter and a slip detection device have been attached to the drive part of the chip conveyor to automatically stop the chip conveyor, and then the operator can rotate the chip conveyor in the forward or reverse direction. This refers to forward and reverse rotation (same in this specification) to unclog the chip and restart (recovery) it. (Problem to be solved by the invention) However, as the automation of the above-mentioned machine tools has progressed further, their prices have become extremely expensive, and the pace of progress has been rapid. In order to shorten this period, machine tool operators are increasingly operating automatically at night when they have returned home. If a chip becomes clogged during automatic operation at night, the machine tool must automatically stop and remain in that state until the next morning when an operator is dispatched, reducing the operating rate of the expensive machine tool. As a result, the amortization period is extended, resulting in a large economic loss for the user. The present invention was made in view of the above-mentioned current situation, and an object of the present invention is to provide a chip conveyor that can automatically recover even when the chip conveyor is clogged with chips. (Means for Solving the Problems) The chip conveyor according to the present invention includes a conveyor body including a driving means, an electric switch that performs forward/reverse rotation and stopping of the conveyor by switching/intermittent electrical connection, and the electric switch. A chip conveyor having a control device for controlling switching/discontinuation of connections, and an overload detection means for detecting an overload of the conveyor, the control device controlling or measuring the time length of each operation. and performs a series of recovery operations in which the conveyor is stopped based on the detection signal of the overload detection means, the conveyor is reversed for a predetermined period of time, then stopped, and then the conveyor is rotated forward, and the detection means determines whether there is an overload. If the overload is still present, an instruction is given to repeat the series of recovery operations such as stop and reverse rotation until the value measured by the timing means of the recovery operation elapsed time reaches a predetermined value. The present invention is characterized by comprising a control means that instructs to cut off the power to the drive means and issue an alarm signal as necessary, without repeating the recovery operation when the elapsed time reaches a predetermined value. (Function) Therefore, when the chip conveyor with the above configuration is clogged with chips and an overload is applied to the conveyor, the conveyor is automatically stopped and reversed to eliminate the chip clogging, and the conveyor function is automatically activated. to recover. Furthermore, if the clumping of chips is not resolved after a predetermined period of time or more even after the recovery operation, the drive power for the conveyor is cut off to prevent the drive source from burning out. It also issues an alarm signal as necessary to notify an emergency stop of the conveyor. (Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings. FIG. 1 is an overall configuration diagram of a chip conveyor according to the present invention,
Figure 2 is an electrical circuit diagram showing the circuit configuration of the control device;
The figure is a flowchart showing the control details and procedures of the chip conveyor. First, the overall structure of the chip conveyor according to this embodiment will be explained based on FIG. Electric switch for reversing and stopping 2
Electricity is supplied from a power source 7 through a switch 3, and the electric switch 3 is configured to be switched between forward and reverse directions or to be turned on and off by a control device 4. Furthermore, a detector 5a of a shock relay 5 is interposed between the electric motor 2 and the electric switch 3 to detect an overload (rapid increase in current) of the electric motor 2, and a control device 4 is provided with An alarm buzzer 6 is connected to notify the inoperability. FIG. 2 shows one embodiment specifically showing the configuration of the control device 4, and in this embodiment, it is constructed of an electrical sequence circuit that operates as shown in the flowchart of FIG. . That is, this sequence circuit is
When you press the start push button switch FBI, the magnetic contactor MSF
A current flows, the magnetic contactor contact MSF in this circuit and the main contact MSF of the magnetic contactor close, a circuit for the normal rotation side of the electric switch 3 of the motor 2 is formed, and the conveyor enters the normal rotation operation state. . In this state, the shock relay 5 for overload detection and the indicator lamp PL are in a energized state and are in a state where overload state detection is possible. When the chip conveyor is clogged with chips and becomes overloaded during forward rotation of the conveyor, the current flowing through the motor 2 increases. When an overcurrent exceeding a set value flows through the motor 2, a current is generated in the secondary coil side of the detector 5a of the shock relay 5, which activates the shock relay 5 and closes its relay contact S.
1 is closed, and the relay C is connected in series with the contact S1.
I? A current flows through 2. As a result, relay contact CR2 closes, current flows through relay CR3, forward/reverse timer TR1, and recovery operation limit timer TR2 connected in series with relay contact CR2, and the electromagnetic contactor MSI? Relay contact CR3 connected in series to relay CR3, Relay contact CR3 connected in series to relay CR3, Magnetic contactor MSR
Recovery operation limit timer contact TR2 directly connected to
is closed, and the forward/reverse timer time limit contact TRI and the recovery operation limit timer time limit contact TR2, which are connected in series to the electromagnetic contactor MSR, operate with a time delay. As a result, current flows through the magnetic contactor MSR, the main contact MS)l of the magnetic contactor MSR closes, and the magnetic contact M
Auxiliary contact MS of the magnetic contactor connected in series to SF
Since R is opened, the conveyor changes from a normal rotation operating state to a reverse rotation operating state. In such a state, the forward/reverse timer T
I? 1. The circuit of the recovery operation limit timer TR2 is in a closed state (energized state). However, after a predetermined period of time has elapsed, the above electromagnetic contactor? ISI
? The time limit contact TRI of the forward rotation timer TRI and the time limit contact T of the recovery operation limit timer TR2 are connected in series with
When R2 opens, the time limit contact TRI of the forward/reverse timer TRI connected in series with the magnetic contactor MSF closes, cutting off the current in the magnetic contactor MSR and causing current to flow through the magnetic contactor MSF, causing the conveyor to moves from the reverse rotation state to the forward rotation state. In this state, if the shock relay 5 does not detect an overload state, that is, if the shock relay 5 has recovered from the chip clogging, the relay CR2 does not operate, so normal rotation operation is maintained. On the other hand, if the shock relay 5 still detects an overload condition, the relay CR2 is activated again and the conveyor performs a series of recovery operations of reverse rotation and forward rotation according to the above procedure. Then, the recovery operation is continued within the set time of the recovery operation limit timer TR2 until the overload condition of the shock relay 5 is no longer detected, and if the overload condition is still detected at the end of the set time, Recovery operation limit timer TR2
The series of recovery operations described above is stopped by the time-limited operation. That is, the time limit contact TR2 of the recovery limit timer TR2 connected in series to the magnetic contactor MSR opens, the time limit contact TR2 of the recovery limit timer TR2 connected in series to the relay CRI closes, and the time limit contact TR2 of the recovery limit timer TR2 connected in series to the electromagnetic contactor MSR closes. Since both the currents in the contactors MSR are interrupted, both main contacts are open and the motor 2 and therefore the conveyor is stopped. Further, contact CR2 of relay CR2 connected in series to alarm buzzer 6 closes and the alarm buzzer sounds. Therefore, even if the chip clogging is not cleared, the electric motor of the conveyor will not be burnt out. In the above embodiment, the control + JJT arrangement is configured by an electrical sequence circuit using an electromagnetic contactor, relay, timer, etc., but instead of these, as shown in FIG. 4, a microcontroller for chip conveyor control is used. The control device may be configured by using a computer (or a computer included in the machine tool body) and incorporating a program into a storage unit to perform control as shown in the flowchart shown in FIG. In such a case, the clock function, arithmetic function,
Memory function can be used. In addition, as another example using an electrical sense circuit,
A circuit configuration as shown in FIG. 5 may be used. Note that the numbers 20.21 in FIG. 2 and the numbers 20 to 24 in FIG. 5 indicate that the same numbers are electrically connected. (Effects of the Invention) As explained above, the present invention has an automatic recovery function that automatically unclogs the chips even if they become clogged, and automatically recovers the chip conveyor. It will also be possible to operate machine tools automatically. As a result, the depreciation period for expensive machine tools can be shortened, resulting in a large economic ripple effect. Furthermore, if the chip cannot be unclogged automatically, it is configured to issue an alarm and automatically shut down, so there is no risk of burning out the motor and causing a fire. 4. Brief description of the drawings FIG. 1 is a schematic overall configuration diagram of the Chisopkon Hair according to the present invention, and FIG. 2 is an electric circuit diagram showing the circuit configuration of the control device.
Fig. 3 is a flowchart showing the control contents and procedures of the chip conveyor, Fig. 4 is a schematic overall configuration diagram showing another embodiment, and Fig. 5 is an electric circuit diagram according to another embodiment. -Conveyor body, 2...Electric motor, 3...Electric switch, 4...Control device, 5...Shock relay 1.5a...Detector, 6...Alarm buzzer, 7...・
power supply. fever diagram 5

Claims (1)

[Claims] A conveyor body equipped with a driving means, an electric switch that reverses and stops the conveyor by switching and disconnecting electrical connections, a control device that controls switching and disconnecting the connection of the electric switch, and an overload of the conveyor. The chip conveyor has an overload detection means for detecting the timing, and the control device stops the conveyor based on a detection signal from the overload detection means and a timing means for controlling or measuring the time length of each operation. , performs a series of recovery operations in which the conveyor is reversed for a predetermined period of time, then stopped, and then the conveyor is rotated in the forward direction, and the above detection means determines whether or not there is an overload, and if it is still overloaded, the above-mentioned stop/reverse operation is performed. An instruction is given to repeat a series of recovery operations until the value measured by the timing means of the recovery operation elapsed time reaches a predetermined value, and on the other hand, when the recovery operation elapsed time reaches a predetermined value, the above drive is performed without repeating the recovery operation. A chip conveyor characterized by comprising: control means for instructing to cut off power to the means and issue an alarm signal as necessary.