JPH07213934A - Method for operating crusher and apparatus therefor - Google Patents

Abstract

PURPOSE:To improve efficiency at crushing work by continuing operation of a crasher when a feeder or a belt conveyer is automatically stopped by over loading. CONSTITUTION:When an overloading condition is generated by feeding articles to be crushed being over the amt. of treating ability into a feeder during crushing work by means of a crusher and the pressure in a pipeline becomes over a set value, the contact of a pressure switch 22B is closed and a relay X12 is excited. A contact X12-2 thereof is opened thereby and magnetic properties of a relay X5 is erased and the contact X5-2 is opened and a solenoid is erased and then, a control valve is returned to the right position and a feeder is automatically stopped and the self-supporting contact X12-1 is closed and the excited condition of the relay X12 is continued. In addition, a displaying lamp RL3 is turned on to inform abnormality of the feeder. In this case, a cursher and a belt conveyer is kept to be worked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating method and an operating device of a crusher for crushing stone, asphalt, reinforced concrete and the like.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing an example of a conventional crusher, FIG. 5 is a plan view, and FIG. 4 to 6, reference numeral 1 denotes a crawler type traveling body, and a base member 1A is provided on the track frame of the traveling body 1.
And a crusher is constructed on the base member 1A. Reference numeral 2 denotes a hopper that receives the crushed object 8, and below the hopper 2, a feeder 4 that feeds the crushed object 8 is provided so as to be driven by a hydraulic motor 10. A crusher 3 crushes the crushed object 8 sent from the feeder 4. The structure of the crusher 3 will be described later. Below the crusher 3 is a crusher 3.
The belt conveyor 5 for delivering the crushed object 8 crushed by is provided so as to be driven by the hydraulic motor 11. In addition, a secondary belt conveyor 6 driven by a hydraulic motor 12 may be provided to load the crushed objects 8 on a truck or the like. Reference numeral 7 is a magnetic separator provided so as to be located above the belt conveyor 5 and suspended from a bracket 27 fixed to the base member 1A. The magnetic separator 7 is composed of a belt conveyor provided with an electromagnet, and conveys the reinforcing bars and the like mixed in the crushed material 8 moving on the belt conveyor 5 to the side of the belt conveyor 5 and drops them.

FIG. 7 is an enlarged view of the crusher 3,
Reference numeral 16 is a fixed crush plate fixed to the base member 1A, and 15 is a movable crush plate facing the fixed crush plate.
The drive mechanism of is configured as follows. Reference numeral 14 denotes a pulley that is rotated by a hydraulic motor 9 (see FIGS. 4 to 6) via a belt 13, and a shaft 18 that rotates integrally with the pulley 14 is a bearing on a side plate 17 that is erected on the base member 1A. A flywheel 28 is fitted and fixed to the shaft 18 on the side opposite to the pulley 14, and the weight of the pulley 14 is made equal to the weight of the flywheel 28 for balancing left and right. There is. The movable crush plate 15
The upper pivoting portion 15a is rotatably fitted to the eccentric collar 19 fitted to the shaft 18. Further, a hooking tool 15b is attached to the lower part of the movable crushing plate 15, and the hooking tool 1b is attached.
The hook 3 biased rearward by the spring 27 on the 5b
0, and the concave portion 1 provided on the back surface of the movable crushing plate 15.
5c and a support block 26a fixed to the base member 1A
Both ends of the support rod 26 are fitted and interposed between the support rod 26 and the concave portion 26b provided in the.

In the crusher, the crushed object 8 put into the hopper 2 by the hydraulic excavator 36 or the like (see FIG. 6) is fed to the crusher 3 by the feeder 4. When the hydraulic motor 9 is rotationally driven in the crusher 3, V
Since the pulley 14 rotates via the belt 13 and the shaft 18 rotates, the pivot portion 1 is attached to the eccentric collar 19 fixed to the shaft 18.
The movable crushing plate 15 fitted with 5a swings in the up-down and front-rear direction while the lower part is stretched from the back by the support rod 26 and is biased rearward by the spring 27, and the movable crushing plate 15 and fixed crushing The object to be crushed 8 is crushed between the plate 16 and the crushed object. This crusher uses the inertial force generated by the rotation of the pulley 14 and the flywheel 28 to move the movable crush plate 1.
The crushing force of No. 5 is averaged and a large crushing force is obtained. Further, since the pulley 14 and the flywheel 28 having a large weight are rotated, the rotation speed of the pulley 14 is set to about that of the hydraulic motor 9. Decelerate to 1/5. The material crushed by the crusher 3 is sent to the ground via the belt conveyor 5 or to the cargo bed of a truck, for example, via the secondary belt conveyor 6.

[0005]

In the conventional crusher described above, the crusher 8 is charged with a crushed object 8 having a weight or size larger than the processing capacity during the crushing operation, or the crushed object is clogged. When the crusher 3 or the belt conveyor 5 is overloaded and automatically stopped, the operations of the hydraulic motors 9 to 11 are automatically stopped, the movement of the crushed material 8 is stopped, and the crushed material 8 is removed. Work such as removal is performed, and after the work is completed, the hydraulic motors 9 to 11 are restarted to restart the crushing work. In this case, even if the crusher 3 has no cause for stopping and the belt conveyor 5 and the feeder 4 are automatically stopped due to overload, it is necessary to remove the crushed object 8 clogged in the crusher 3.
This is because if the crushed object 8 is restarted while the crushed object 8 is sandwiched between the crusher 3 and the crusher 3 without inertia due to the rotation of the pulley 14 and the flywheel 28.
The object 8 to be crushed is crushed only by the output of the driving hydraulic motor 9 at the time of starting, but the output of the hydraulic motor 9 at the time of starting is insufficient in power, and in many cases, it is movable. It is not possible to move the crush plate 15, that is, to restart the hydraulic motor 9 for driving the crusher 3. Therefore, even if the crusher 3 is not overloaded, the crushed object 8 sandwiched between the crushers 3 must be removed, but the crushed object 8 removal work in the crusher 3 requires a great deal of labor and time. There was a problem.

In view of the above-mentioned problems, the present invention provides a method for stopping an operation other than when the crusher is automatically stopped.
An object of the present invention is to provide a method of operating a crusher and a device therefor capable of restarting a hydraulic motor for driving a crusher without the trouble of removing the crushed object sandwiched between the crushers.

[0007]

In order to achieve the above object, the operating method of the present invention comprises a crusher for crushing an object to be crushed, a feeder for feeding the object to be crushed to the crusher,
A method of operating a crusher equipped with a belt conveyor for delivering an object to be crushed by a crusher, wherein when the feeder or the belt conveyor is automatically stopped due to overload, the operation of the crusher is continued. Characterize.

Further, the device of the present invention is activated when the pressure in the corresponding pipeline reaches or exceeds a predetermined value in the pipeline between each hydraulic motor for driving the feeder, crusher and belt conveyor and the hydraulic pump. Each of the feeder pressure switch, the crusher pressure switch, and the belt conveyor pressure switch are provided, and the electric circuit for controlling the control valve of each hydraulic motor stops the corresponding hydraulic motor by the operation of each pressure switch, and When the crusher pressure switch is activated and the belt conveyor pressure switch is activated, the feeder driving hydraulic motor is also stopped at the same time, and the crusher operation is continued. Further, it is preferable to provide a self-holding circuit that holds the stopped state of the hydraulic motor due to the operation of the pressure switch, and a reset switch that releases the self-holding.

[0009]

According to the method of the present invention, when the feeder or the belt conveyor is automatically stopped due to overload, the crusher continues to operate (however, after the feeder or the belt conveyor is automatically stopped, the crusher is operated for a while). , The crusher may be stopped manually, so there is no crushed material left in the crusher.

Further, according to the apparatus of the present invention, the pressure in the pipeline of the hydraulic motor of either the feeder or the belt conveyor becomes equal to or higher than the specified value, and the pressure switch in any of these pipelines is activated to activate the feeder. Or, when the belt conveyor is stopped, the crusher continues to operate, so that no crushed material remains in the crusher. When the crusher pressure switch or belt conveyor pressure switch is activated, the crusher or belt conveyor stops and the upstream feeder also stops at the same time.Therefore, crushed material may flow into the crusher or belt conveyor. To be prevented. Further, when each pressure switch is provided with a self-holding circuit, after the pressure of the pipeline becomes equal to or higher than a specified value and is activated, even if the pressure of the pipeline drops below the specified value, the stopped feeder, crusher, Alternatively, the belt conveyor remains stopped.

[0011]

1 and 2 are examples of an electric circuit for carrying out a method of operating a crusher according to the present invention, and FIG. 3 is a hydraulic circuit diagram of a main part of the embodiment. The crusher targeted in the present embodiment has the same basic structure as the crusher shown in FIGS. 4 to 7. As shown in the hydraulic circuit diagram of FIG. 3, the hydraulic motor 9 for driving the crusher 3 is connected to a hydraulic pump 20A through a control valve 21A, and a hydraulic line for connecting the hydraulic motor 9 and the control valve 21A is connected. Of these, a pressure switch 22A is provided in a pipe line 23A to which pressure oil is supplied during crushing work (normal rotation), and the pressure switch 22A has a pressure of the pipe line 23A set to a set value (for example, 270 kg / c).
It is configured to operate and close the electrical contacts when the pressure exceeds m ² ). Further, the hydraulic motor 10 for driving the feeder 4 has the hydraulic pump 2 via the control valve 21B.
0B, which connects the hydraulic motor 10 and its control valve 21B, is provided with a pressure switch 22B in a conduit 23B to which pressure oil is supplied when the feeder 4 operates, and similarly, the belt switch The hydraulic motor 11 for driving the conveyor 5 is connected to the hydraulic pump 20C via the control valve 21C, and the hydraulic oil is supplied during the operation of the belt conveyor 5 in the pipeline connecting the hydraulic motor 11 and the control valve 21C. The pressure switch 22C is provided in the pipe line 23C. The pressure switch 22B for the feeder and the pressure switch 22C for the belt conveyor are set to the pressures of the pipelines 23B and 23C (for example, 200 kg).
/ cm ² ) and above, it is configured to operate and close the electrical contacts.

In FIG. 1, PB1 is an emergency stop switch, PB2 and PB3 are an on switch, an off switch and a PB of the hydraulic motor 11 for the belt conveyor 5, respectively.
4, PB5 are an on switch, an off switch, and a PB of the hydraulic motor 12 for driving the secondary belt conveyor 6, respectively.
6, PB7 are the on-switch and off-switch for the magnetic separator 7, PB8 and PB9 are the feeder 4 respectively.
ON switch, OFF switch of the hydraulic motor 10 for driving,
PB10 is an ON switch for forward rotation of the hydraulic motor 9 for driving the crusher 3, PB12 is an ON switch for reverse rotation,
PB11 indicates an off switch of the crusher 3, and 22A to 22C indicate the pressure switch, PB1.
Reference numeral 3 is a reset switch. Further, X1 to X12 are relays, and Xi-j (i = 1 to 12, j = 1 to 4) are contacts of each relay Xi. Further, GL1 to 4, 6, and 7 are lit in synchronization with the respective on switches (PB2, 4, 6, 8, 10, 12), and the respective off switches (PB3,
5, 7, 9, 11) are indicator lamps that indicate the operating state of each part by turning off the lights in synchronization with each other. Also, R
L1 to L3 are display lamps that are lit in synchronization with the pressure switches 22A to 22C and notify the abnormality occurrence portion.

In FIG. 2, 31a and 31b are solenoids of the control valve 21A for controlling the crusher 3 and 3
2 is a solenoid of the control valve 21B for controlling the feeder 4, 33 is a solenoid of the control valve 21C for controlling the belt conveyor 5, 34 is a secondary belt conveyor 6
Solenoid of a control valve (not shown) of the hydraulic motor 12 for use, 35 is a control valve for the magnetic separator 7 (not shown)
The respective solenoids are shown. In addition, in FIG.
The hydraulic circuits of the next belt conveyor 6 and the magnetic separator 7 are not shown.

In the crusher of this example, the on switch PB
When you press 2, the relay X2 is excited and the self-holding contact X
2-1 is closed, the contact X2-3 is closed, the solenoid 33 is excited, the control valve 21C is switched to the left position, the hydraulic motor 11, that is, the belt conveyor 5 is operated, and the display lamp GL1 is turned on to turn on the belt. It informs that the conveyor 5 is operating. Similarly, by pressing the on-switches PB4, PB6, PB8 or PB10, the secondary belt conveyor 6, the magnetic separator 7, the feeder 4 or the crusher 3 operates. However, the feeder 4 does not operate only with the on switch PB8, and the on switch PB8 does not operate.
2 and PB10 push the belt conveyor 5
When the crusher 3 is operated, that is, when the relays X2 and X6 are excited and the contacts X2-2 and X6-4 are closed, the relay X5 is excited and the contact X5-2.
Is closed, the solenoid 32 is excited, and the control valve 2
1B is switched to the left position, and the feeder 4 operates.

By depressing the off switch PB3, the relay X2 is demagnetized, the self-holding contact X2-1 is opened, the contact X2-3 is opened, and the solenoid 33 is demagnetized.
The control valve 21C returns to the right position, and the hydraulic motor 1
1, that is, the belt conveyor 5 is stopped and the display lamp GL1 is turned off to notify the stop of the belt conveyor 5. Similarly, by pressing the off switch PB5, PB7, PB9 or PB11, the secondary belt conveyor 6, the magnetic separator 7, the feeder 4 or the crusher 3 respectively.
Stops. When the emergency stop switch PB1 is pressed, the relay X1 is excited and the contact X1-1 is opened, so that the feeder 4, the crusher 3, and the belt conveyors 5 and 6 are entirely stopped.

During the crushing work by the crusher, the crushed object 8 having a processing capacity or more is fed into the feeder 4 to cause an overload condition, and when the pressure in the pipe line 23B becomes the set value or more, the pressure switch 22B is operated. The contact is closed and the relay X12 is excited. As a result, the contact X12-2 is opened and the relay X5 is demagnetized, the contact X5-2 is opened and the solenoid 32 is demagnetized, the control valve 21B is returned to the right position, and the feeder 4 is automatically stopped and self-holding. The contact X12-1 is closed to keep the excited state of the relay X12, and the display lamp RL3 is turned on to notify the abnormality of the feeder 4. In this case, the crusher 3 and the belt conveyor 5 are still operating.

When the belt conveyor 5 becomes overloaded and the pressure in the conduit 23C exceeds a set value, the contact of the pressure switch 22C is closed, whereby the relay X1.
1, the self-holding contact X11-1 is closed, the contact X11-2 is opened, the relay X2 is demagnetized, and the contact X2-.
3 is opened, the solenoid 33 is demagnetized, the control valve 21C returns to the right position, the hydraulic motor 11, that is, the belt conveyor 5 is automatically stopped, and the display lamp RL2
Lights up to notify the belt conveyor 5 of abnormality. At the same time, the contact X11-3 is opened and the relay X5 is demagnetized, so that the feeder 4 is stopped as described above. In this case, the crusher 3 remains activated.

When the crusher 3 is overloaded, the contact of the pressure switch 22A is closed, which excites the relay X10 and the self-holding contact X10-1.
Is closed, the contact X10-3 is opened to degauss the relay X6, the contact X6-3 is opened to degauss the solenoid 31a, the control valve 21A is returned to the neutral position, and the crusher 3 is automatically stopped and the indicator lamp R
L1 lights up to notify the crusher 3 of abnormality. Also,
At the same time, by opening the contact X10-2, the relay X5
Is demagnetized, and the feeder 4 stops as described above. In this case, the belt conveyor 5 remains activated.

As described above, the feeder 4 or the belt conveyor 5 is overloaded, and the pressure switch 22C or the pressure switch 22B is actuated to operate the feeder 4 driving hydraulic motor 10 or the belt conveyor 5 driving hydraulic motor 1.
Even if 1 automatically stops, hydraulic motor 9 for driving crusher 3
Since the crusher 3 continues to operate without stopping, the crushed object 8 does not remain on the crusher 3. Therefore, feeder 4
Alternatively, even if the hydraulic motor 9 is temporarily stopped in order to deal with clogging of the crushed material 8 on the belt conveyor 5, the hydraulic motor 9 does not need to remove the crushed material 8.
Can be restarted.

Any one of the relays X10 to X12
In the state where one or two are excited, even if one of the on-switches PB2, PB8, PB10 of the stopped device is pressed by mistake, the contact X1 connected to the relays X2, X5, X6 is connected.
Since any one of 1-2, X10-2 to X12-2, and X10-3 is opened, the stopped device is not activated, and the reset switch 13 is pressed to relay X1.
It becomes possible to start only when one or two of 0 to X12 are demagnetized, and therefore, it is possible to prevent the risk that the hydraulic motor stopped suddenly during the work for handling clogging etc. suddenly starts to operate, and the safety is maintained. Be drunk

Further, when the crusher 3 or the belt conveyor 5 is automatically stopped, the feeder 4 on the upstream side is automatically stopped at the same time, so that the crushed material 8 can be prevented from flowing into the crusher 3 or the belt conveyor 5.

[0022]

According to the first aspect of the present invention, even if the feeder or the belt conveyor is automatically stopped due to overload, the crusher continues to operate. Therefore, if the feeder or the belt conveyor causes a stop, the conventional method is used. The time required to remove the crushed material from the crusher and to restart the crusher is not required, so the efficiency of the crushing operation can be improved and the labor can be reduced.

According to the second aspect, the same efficiency improvement and labor reduction as in the first aspect can be achieved, and when the crusher or the belt conveyor is automatically stopped, the feeder on the upstream side is also stopped simultaneously. The crushed material can be prevented from flowing into the belt conveyor.

According to the third aspect of the present invention, the pressure switch is provided with a self-holding circuit so that the device in the automatic stop cannot be started unless the reset switch is operated. Even if the road pressure drops below the specified value, the hydraulic motor that has stopped automatically will remain stopped. Therefore, it is possible to prevent the danger that the hydraulic motor suddenly starts to be driven during the work for handling the clogging or the like.

[Brief description of drawings]

FIG. 1 is an example diagram of an electric circuit for implementing a method of operating a crusher according to the present invention.

FIG. 2 is an electric circuit diagram of a solenoid of a control valve of the embodiment.

FIG. 3 is a hydraulic circuit diagram of a main part of the embodiment.

FIG. 4 is a side view showing an example of a self-propelled crusher.

FIG. 5 is a plan view of the crusher.

FIG. 6 is a view showing a main configuration of a crusher of the crusher.

FIG. 7 is an enlarged side view showing a crusher of the crusher.

[Explanation of symbols]

 3 Crusher 4 Feeder 5 Belt Conveyor 6 Secondary Belt Conveyor 7 Magnetic Separator 8 Crusher 9 Hydraulic Motor for Crusher 10 Hydraulic Motor for Feeder 11 Hydraulic Motor for Belt Conveyor 12 Hydraulic Motor for Secondary Belt Conveyor 20A to 20C Hydraulic Pump 21A to 21C control valve 22A-22C pressure switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobutaka Hirano 2-6-2 Otemachi, Chiyoda-ku, Tokyo Within Nitto Construction Machinery Co., Ltd. (72) Yuichiro Imano 2-chome Otemachi, Chiyoda-ku, Tokyo No. 2 Nitto Construction Machinery Co., Ltd.

Claims (3)

[Claims] 1. A method of operating a crusher comprising a crusher for crushing an object to be crushed, a feeder for feeding the object to be crushed to the crusher, and a belt conveyor for sending the object to be crushed by the crusher. Yes, if the feeder or belt conveyor automatically stops due to overload,
A method for operating a crusher, which comprises continuing the operation of the crusher. 2. A device for carrying out the method of operating a crusher according to claim 1, wherein pipes corresponding to pipe lines between hydraulic motors and hydraulic pumps respectively driving the feeder, crusher and belt conveyor. An electric circuit for controlling the control valve of each hydraulic motor is provided with a pressure switch for the feeder, a pressure switch for the crusher, and a pressure switch for the belt conveyor, which are activated when the pressure in the passage reaches a predetermined value or more. The hydraulic motor of the corresponding pipeline is stopped by the above, and the feeder drive hydraulic motor is stopped at the same time when the pressure switch for the crusher and the pressure switch for the belt conveyor are activated, and the crusher operation is continued. The operating device of the crusher. 3. The crusher operating apparatus according to claim 2, further comprising a self-holding circuit for holding the stopped state of the hydraulic motor due to the operation of the pressure switch, and a reset switch for releasing the self-holding.