JPS6043178B2 - Rotating crusher operation control method - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The invention of this application independently controls the operation of a rotary crusher having a hydraulic lifting mantle, such as a cone crusher, used for crushing iron ore used as a raw material for steel manufacturing. The operation of the rotary crusher can be controlled by controlling the level of the supply section, the set amount of crushing gap between the cone cave and the mantle, and the hydraulic pressure of the hydraulic cylinder. This invention relates to a method for controlling the operation of a machine.In short, the raising and lowering operation of a hydraulic cylinder is performed by an oil drain valve and a lubrication pump that operate within a set current value range, and the lubrication pump is further controlled by feedback of the set amount and a low pressure switch. A method for controlling the operation of a rotary crusher, in which an oil drain valve is controlled by level feedback, and at least one of a high pressure switch and a safety level meter of a hydraulic cylinder opens the safety valve of the hydraulic cylinder. This is such an invention.

<Prior art> As is well known, iron ore, which is used as a raw material for steel manufacturing, has a wide range of properties such as hardness and viscosity. Processing is taking place.

As mentioned above, crushing during pre-treatment is due to the non-uniform properties of the iron ore, so when using a rotary crusher such as a normal cone crusher, many operating conditions such as feed amount, set amount, moving current value, etc. are complicated. There were problems such as entanglement, human control such as visual operation, and manual operation, which made stable operation difficult and resulted in variations in product accuracy. <Problem to be solved by the invention> To solve this problem, for example, it is possible to use a rod mill, but the power required for its operation is extremely large except for special operations, and as a result, it is expensive and requires a lot of power. Although this method has advantages, it also has disadvantages in that the process is complicated and the work is cumbersome because classification operations may be required as post-processing.

The object of the invention of this application is based on the above-mentioned prior art. The problem of crushing iron ore as a raw material is considered as a technical issue to be solved, and a rotary crusher is operated in an optimal state completely automatically regardless of the properties of the raw material, thereby benefiting the crushing application field in the construction industry. This paper aims to provide an excellent method for controlling the operation of a rotating crusher. It is. <Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the above-mentioned claims, is to develop a cone crusher having the most appropriate crushing performance.・When operating a rotary crusher such as a latshear, the set amount adjustment by raising and lowering the mantle is basically done through oil draining and lubrication within the rated setting value of the operating current, and in addition to this, setting The set amount is regulated based on the upper limit of the amount and the operating load limit, and in case of dangerous pressure increase due to foreign matter getting caught, the safety valve is opened via the high pressure switch, the feeder is stopped, and the low pressure is increased. Technology that enables control over the switch and level feedback to control the oil drain valve without activating the oil pump, suppressing mantle rise, and enabling optimal operation based on the interrelationship of level amount, operating pressure, and set amount. The measures taken were as follows.

1 <Embodiment> Next, one embodiment of the invention of this application will be described below with reference to the drawings.

Although Figures 2a and 2b are originally flows shown in one drawing, each half is shown for convenience of illustration, and the right end of the former and the left end of the latter are connected in one diagram. It is something that

In the mechanism and control circuit shown in FIG. 1, 1 is a hopper, to which a predetermined iron ore raw material is supplied and stored by a conveyor (not shown), and a well-known vibrating feeder 2 is provided at the lower end of the hopper. 100% via closed contact 3, 80
It is electrically connected via a circuit 5 to an appropriate control mechanism 4 that sends three types of control signals: %, stop, and stop.

Reference numeral 6 designates a cone crusher as a well-known rotary crusher, and a distributor 9 rotated by a motor 8 is provided in the supply section 7 of the cone crusher.
is provided facing directly below the tip of the vibrating feeder 2, and a first level meter 10 for measuring the operating level;
A safety level meter 11 for second level measurement for emergency is installed above it.

Reference numeral 12 denotes a mantle, which is mounted on a rotating shaft 15 through a rotating crushing gap 14 with respect to the outer cone cave 13, its upper end is pivotally supported by a bearing 16, and its lower end is connected to a ram 18 of a hydraulic cylinder 17; The pivot shaft 15 is connected to a transmission mechanism 19 as appropriate.
It is linked to the drive motor 20 via.

Further, a suitable potentiometer 21 provided on the bearing 16 is electrically connected to a well-known Sersin receiver 23 by a lead wire 22, and is configured to set the upper limit of the rotating crushing gap 14 to 8TnJn and send an operating signal to the lead wire 24. It is being done.

On the other hand, the downwardly extending vibe 25 from the hydraulic cylinder 17 has, for example, 60/c! A branched accumulator 26 is provided, and the motor 2 is connected to the motor 2 via a coupling 27.
8 and also has a check valve 29
The vibrator 31 is equipped with, for example, an electromagnetic safety valve 32 operated at 80/d, and the vibrator 33 is equipped with an electromagnetic oil drain valve 34 for operation.
A vibrator 36 with a low pressure switch 35 at the lower limit of t interposed therebetween is connected between the oil tank 37 and each vibrator 36 .

The motor 28 is connected to a power source RST 38 via a normally open contact 39 with a lead wire 40.
0, the lead wire 41 from the oil drain valve 34 is the normally open contact 4
2, and a lead wire 43 from the safety valve 32 is connected via a normally open contact 44.

A meter relay 45 is connected to a galvanometer 46 of the drive motor 20 by a lead wire 47, and has a set current value range of rated current between 75% and 90%, for example.
A lead wire 48 from the lower limit value of the meter relay 45 is connected to the normally open setting 4 via a pre-stage timer 49 and an operation timer 50.
On the other hand, a lead wire 51 from the upper limit value is connected to the normally open contact 39 via the normally closed contacts 54 and 55, which also have a pre-stage timer 52 and an operation timer 53 connected therebetween. ing.

A lead wire 56 from the low pressure switch 35 is combined with a lead wire 24 from the Sershin receiver 23 and connected to the normally closed contact 55.

In addition, the high pressure switch 57 for safety detection connected to the lower extension vibration 25 of the hydraulic cylinder 17 is set to operate at 80/al, for example, and the normally open contact 4 is set to 80/al with a timer 58 interposed.
4 with a lead wire 59, and furthermore, the lead wire 59
A lead wire 60 from the emergency safety level meter 11 is connected to the , and a lead wire 61 is branched and connected to the normally closed contact 3 of the vibrating feeder 2 . Further, the lead wire 62 from the first level meter 10 has a lead wire 63 branching to the control mechanism 4, and the normally closed contact 54 of the lead wire 51 from the upper limit value of the meter relay 45;
and a lead wire 6 branching to a lead wire 48 from the lower limit value.
4,65.

In the above-mentioned control mechanism, basically, the cone crusher 6 is operated within the set current value range of the rated current by the drive motor 20, and when the current of the motor 20 that is energized to the meter relay 45 exceeds 90%, For example, from the set time for incorrect measurement of inertial deflection of the meter of the meter relay 45,
The pre-timer 49 is energized for a period of time such as 7 seconds for 5 seconds,
At the same time, the operation timer 50 is energized for 5 seconds to close the normally open contact 42, open the oil drain valve 34, drain the pressure oil 66 of the hydraulic cylinder 17 to lower the set amount, and independently of the process, When the specified amount of the first level meter 10 is exceeded, the control mechanism 4 is commanded to feed 80%, and the lead wire 6
2 and 65, it passes through the pre-stage timer 49 and the operating timer 50, and closes the normally open contact 42 to drain the oil.

During this time, the normally closed contact 54 is opened by the lead wire 64 to ensure that no lubrication is performed.

In addition, in the event of an abnormal situation such as a foreign object being caught, the high pressure switch 57 detects the pressure applied to the hydraulic cylinder 17 and closes the normally open contact 44 by energizing the timer 58 for a set time of 10 seconds, for example, and closes the safety valve. 32 to transfer the pressure oil from the hydraulic cylinder 17 from the vibrator 33 to the oil tank 37.
Drain the oil and lower the set. At the same time, the normally closed contact 3 is opened by the lead wire 61, and the vibrating feeder 2 is opened.
and safely operate to stop the supply.

Of course, the high pressure switch 57 detects foreign objects and the safety level meter 11
The opening operation of the safety valve 32 is performed independently by overflow detection.

In addition, when the state of no-load operation occurs due to the consumption of iron ore during operation, the low pressure switch 35 changes the set pressure, for example,
20/CrlL or less, the normally closed contact 55 is closed via the lead wire 56, the lead wire 51 is cut off, and the lubrication pump 30 is closed.
is deactivated, and when the set amount decreases by 8, the potentiometer mechanism 21 activates the resel sink receiver 23.
via which lead wire 24 also opens normally closed contact 55, likewise disabling the inlet oil pump 30.

On the other hand, when the current of the drive motor 20 becomes 75% or less, the pre-timer 52 operates for 7 seconds through the normally closed contact 54, and at the same time, the operation timer 53 operates for 5 seconds, passes through the normally closed contact 55, and closes the normally open contact 39. Closed, applicable) set time power supply RST38
energizes the motor 28 to operate the oil pump 30, pressure oil 66 is sent from the oil tank 37 to the hydraulic cylinder 17 via the check valve 29, and the mantle 12 is raised via the ram 18. Increase the set amount.

In the above-described operation, each of the pre-timers 49, 52, operating timers 50, 53, and timer 58 expires at the set time, but it goes without saying that they will be automatically reset unless the operating conditions are canceled.

Furthermore, it goes without saying that the above-mentioned oil drain and oil filling controls are performed as independent events depending on the mutually independent relationships among the set amount, feed amount, rated current value, and level amount. The accumulator 26 is operated at a pressure of 60/Clt, for example. Next, the operation mode will be explained using a model experiment using the flowcharts shown in FIGS. 2a and 2b. For convenience of explanation, the supply amount % of the vibration feeder 2 is shown on the top level, and the level amount L of the supply section 7 of the cone crusher 6 is shown on the next level, corresponding to the first level meter 10 and safety level meter 11 in FIG. Lines 11 and 12 are used as indicators, and the third stage is the working pressure P of the hydraulic cylinder 17, the fourth stage is the working current value A of the drive motor 20, and the fifth stage is the set amount SET of the crushing gap 14. In addition, an operation mode M is provided at the bottom, and the horizontal axes of all stages are shown with the same chronological description, and detailed explanations will be given in order of the modes.

First, when the start button for the cone crusher 6 is pressed, the motor 20 is started and the set amount is undefined, but for example, as shown in the figure, the starting opening is 97r0! Start from L.

Mode 1: Start feeding iron ore from vibrating feeder 1, 2 start feed 100%, current value rises to 75%, cylinder pressure 40/c! The first level meter 10 is inoperative.

Mode 2: After that, the normally open contact 39 closes due to the rated current drop T seconds later, and the oil pump 30 narrows the set amount by 0.57WL for 5T3 seconds.

Mode 3: Equilibrate in that state and see what happens.

Mode 4: Normally open contact 4 for T3 seconds when the current value exceeds the rated current
2 opens and the set amount of 0.5 wIn is released via the oil drain valve 34.
spread. 3 Mode 5: Rated current operation, check the situation in parallel condition. Mode M1: Since the state in which the current exceeds the rated current is repeated, the pre-stage timer 49 and the operation timer 50 are repeatedly reset, the normally open contact 42 is repeatedly closed, and the φ set amount is lowered by 0.5 increments until it reaches 10.5 increments. Lower it.

In this state, the rated current is much lower than 75%, and the treated material is soft and less sticky.

Mode M2: When the rated current drops too much, the meter relay 45 activates the pre-timer 52 and the operation timer 5.
3, the normally open contact repeats setting and resetting by repeating the operation for T1 and T3 seconds, and the hydraulic pump 30 repeatedly operates to increase the set amount by 0.5 Tf$i. Mode 6: When the ram 18 rises and the set amount of the mantle 12 reaches the upper limit of 8, the potentiometer mechanism 21 operates and the
3, the normally closed contact 55 is opened, the motor 28 of the oil pump 30 is stopped, and the rise of the mantle 12 is restricted.

When the rated current exceeds 90%, the normally open contact 42 operates to open the oil drain valve 34 and reduce the set amount to 0.5 Tfr.
! Lower n and continue steady operation.

During this time, the level amount is changed to the first level meter 1 in the supply section 7 for 3 seconds.
Since the value exceeds 0, the control mechanism 4 uses the circuit 63 to reduce the feed amount to 80% for T4 seconds, and this is repeated twice, and the second time a command signal is sent to the lead wire 48 from the lower limit value via the lead wires 62 and 65. is transmitted, the normally open contact 42 is set to 0N, the oil drain valve 34 is operated, and the set amount is reduced to 9 pieces. Then, once it stabilizes, the feed amount by the control mechanism 4 is returned to 100%.

Mode M3: During this period, the processed material has high moisture and high stickiness.

Mode 8: Since the first level 10 is over-detected,
The normally open contacts are closed via leads 65, 48 to lower the level.

During this time, the set amount continues to be lowered even if the current is below the rated current value at 80% feed.

This facilitates the passage of soft iron ore.

Mode 9: Lower the set amount because the level continues to be over.

6-Do 10: When lowered further, the first level meter 10 becomes stable and the current returns to the rated current.

6-Do 11: Even at a stable level with a feed amount of 80%, the rated current will be exceeded, so close the normally open contact 42 using the pre-stage timer 49 and operation timer 50, open the drain valve 34, and lower the set amount to 13.5wn. .

Then, after T, T6 seconds have elapsed from mode 10, the control mechanism 4
The cutting amount of the vibrating feeder 2 is returned to 100%, and the properties of the ore are observed.

Mode 12: As mentioned above, when the feed amount returns to 100% and the level amount immediately returns as shown by the dotted line, the normally open contact 39 is immediately closed and the oil pump 30 is activated 5 to increase the set amount. As shown, even if the level amount is still low, the normally open contact 39 operates the motor 28 by operating the pre-stage timer 52 and the operation timer 53 for T3 and T1 seconds.
The set amount is repeatedly increased through the hydraulic pump 30 until the rated current is reached, and the current value is 75%.
, the normally open contact 39 returns and opens, and the hydraulic pump 3
0 is stopped and the set is in a calm state.

Mode 13: Then, steady operation is continued.

1 mode 14: When the feed is stopped due to an accident, failure, foreign matter in the hopper, etc., the load current also decreases, and as a matter of course, the pressure in the hydraulic cylinder 17 also decreases. Therefore, the pressure of the low pressure switch 35 is 20/C.
Upon detection of Tl2 or less, the normally open contact 55 opens and the lead wire 51 from the earth limit value is cut off, so the normally open contact 39 does not close, and as a result, the hydraulic pump 30 does not operate and the set does not rise.

Of course, since the current is below the rated current, the normally open contact 422 does not close and the drain valve 34 does not open, so the set amount remains unchanged.

Then, when the feed is restarted, it returns to normal.

Mode 15: Due to the time delay of the feed after mode 14.
Even if cutting from the vibratory feeder 2 is started, if the level of the supply section 7 is empty, the reset amount is similarly kept unchanged by the operation of the low pressure switch 35 and does not change unnecessarily.

Mode 16: When a foreign object, such as a piece of iron, is inserted, the fracture pore pressure increases, so 60/c! When the temperature exceeds l, the accumulator 26 operates.

However, at that moment, the rated current increases rapidly, so the pre-stage timer 49 and the operation timer 50 operate, and the normally open contact 4
2 is closed, the oil drain valve 34 is opened, and the pressure oil 66 is suddenly drained due to the sudden increase in pressure, and the set amount expands at once. -, and the oil drain valve 34 closes in T1 seconds.

Mode 17: When the foreign object in mode 16 is extremely large, the pressure increases rapidly and exceeds the capacity of the accumulator 26, the high pressure switch 57 is activated, and, for example,
The timer 58 is activated for 1 to 2 seconds, the normally open contact 44 is closed via the lead wire 58, the safety valve 32 is closed, and the ram 18 is lowered at once to widen the set amount and allow the foreign matter to escape.

Therefore, after that, the timer 58 stops and the load current drops due to the quick opening setting, so a signal is input to the rising circuit 51, and the normally open contact 39 is cycle set according to the set time of the pre-stage timer 52 and the operation timer 53. The motor 28 is started, the ram 18 is raised by the lubrication pump 30, and the set is raised to a steady state at the rated current. Mode 18: By the way, although it is extremely rare, mud etc. may suddenly enter the supply section 7 due to a belt conveyor etc.
In that case, the level naturally exceeds the first level meter 10 and reaches the safe level meter 11.

Therefore, the safety level meter 11 detects this, opens the normally closed contact 3 through the lead wire 61, stops the vibrating feeder 2, and stops the supply. Close the normally open contact 44, close the safety valve 32, and lower the set amount to avoid high loads.

Thereafter, the set amount is restored by the lubrication pump 30 through the lead wire 51 from the upper limit value via the meter relay 45 and the normally open contact 39 by sequentially conducting a current below the rated current value.

Mode 19: Manual operation switching. Mode 20: Small cutting amount,
Driving with a large set.

Mode 21: Operate with small cutting amount and small set. mode 22
: Even during manual operation, the second level operation, emergency function works, and safety valve 32 works. Mode 23: Operation stopped.

Mode 24: Release maintenance, reset, standby.

As in the above embodiment, it can be seen that the feed amount, set amount, current value, and cylinder pressure are mutually independently involved in control.
It should be noted that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments, and it is of course possible to adopt various other embodiments and designs. According to the invention, in a method for controlling the operation of a rotary crusher such as a cone crusher, the hydraulic elevating mantle is operated by an oil drain valve using an oil feed pump, and the pressure oil supply and discharge is based on the rated current value range. However, by feeding back the set amount with the low pressure switch of the hydraulic cylinder so that the lubrication pump does not operate independently, and by controlling the level amount and oil supply independently, the set amount, level amount, The operation of each oil pressure can be controlled independently, and these controls work together to control the operation of the crusher in a total optimal state. It is possible to automatically operate in the optimum operating state even for a wide range of materials to be processed.
The efficiency, stability, and high precision of the rotary crusher are effectively utilized, and the power required is kept to a minimum, producing excellent products at low cost. By setting at least one of the high-pressure switches at a high level to automatically open the safety valve of the hydraulic cylinder after a set time via a timer, in addition to the automatic operation control described above, the safety of the equipment is also ensured. In addition to being able to improve durability, it also has the excellent effect of improving the quality and accuracy of manufactured products.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention of this application, and FIG. 1 is a schematic diagram of a control system, and FIGS. 2a and 2b are divided explanatory diagrams of a flow. 12... Mantle, 6... Rotating crusher, 17... Hydraulic cylinder, 34... Oil drain valve, 30... Oil pump, 35... ...Low pressure switch, 57...High pressure switch, 11...
... Safety level meter, 32 ... Safety valve.

Claims (1)

[Scope of Claims] 1. Optimum operation of the rotary crushers each having a hydraulic lifting mantle is achieved through the interrelationship of the level amount, hydraulic pressure, and crushing gap set amount, which allow the operation of the rotary crusher to be independently controlled. In the controlled method, the lifting hydraulic cylinder with respect to the mantle is moved up and down by an oil drain valve and a lubrication pump so that the set amount can be independently controlled, and the oil drain valve and the lubrication pump are operated within a set current value range. The low pressure switch of the hydraulic cylinder disables the lubrication pump and controls it independently by hydraulic pressure, and the set amount is also fed back to control the lubrication pump so as not to operate; The level amount is fed back to independently control the opening and closing of the oil drain valve, and the level amount, hydraulic pressure, and set amount control cooperate to control the rotary crusher. A method for controlling the operation of a rotating crusher, characterized by: 2. A method in which a rotary crusher having a hydraulic lifting mantle is controlled to an optimum operation by the interrelationship of a level amount, hydraulic pressure, and a crushing gap set amount that can each independently control the operation of the rotary crusher, The lifting hydraulic cylinder with respect to the mantle is moved up and down by the oil drain valve and the oil feed pump, so that the set amount can be independently controlled, and the oil drain valve and the oil feed pump are operated within a set current value range, and the oil drain valve and the oil feed pump are operated within a set current value range. A low pressure switch on the cylinder disables the lubrication pump and independently controls it by hydraulic pressure, and the set amount is also fed back to control the lubrication pump so as not to operate, while the level amount is fed back. The opening and closing of the oil drain valve is controlled independently, and the control based on the level amount, hydraulic pressure, and set amount are cooperatively controlled to control the rotary crusher, and the high pressure switch of the hydraulic cylinder is A method for controlling the operation of a rotating crusher, characterized in that at least one of the safety level meter and the safety level meter opens a safety valve provided in the hydraulic cylinder after a set time.