JP2007075718A - Hydraulic circuit of jaw crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic circuit of a jaw crusher capable of preventing the hold pressure of a hydraulic cylinder for holding an outlet gap adjusting member from being dropped by the leak of the hydraulic cylinder itself even when outlet adjustment work is not performed for a long period of time in a jaw crusher. <P>SOLUTION: There is provided a pressure introduction circuit C for introducing the driving pressure or the brake pressure of a hydraulic motor 10 for a crusher to a hydraulic cylinder 22 for adjustment via a pressure reducing valve 47, and the drop of the hold pressure of the hydraulic cylinder 22 for adjustment is prevented by the pressure introduced from the pressure introduction circuit C. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of a hydraulic circuit of a jaw crusher for crushing rocks or concrete.

Generally, a jaw crusher crushes the object to be crushed, such as rock or concrete, between the moving tooth attached to the swing jaw and the fixed tooth fixed to the aircraft, and adjusts the particle size of the crushed material. Therefore, an exit gap adjusting mechanism for adjusting an exit gap between the moving tooth and the fixed tooth is provided. In such a jaw crusher, the upper part of the swing jaw is supported by an eccentric shaft that rotates based on the drive of a hydraulic motor, and the lower part is a member constituting the outlet gap adjusting mechanism (an outlet gap such as a toggle plate). The outlet clearance adjusting member is supported by a hydraulic cylinder that positions and fixes the outlet clearance adjusting member.
By the way, the hydraulic cylinder holds the reaction force received from the outlet clearance adjusting member during the operation of the jaw crusher. The holding pressure of the hydraulic cylinder is a check valve arranged in the hydraulic oil supply circuit of the hydraulic cylinder. There is a risk that it will gradually decrease due to leakage of the hydraulic cylinder itself.
Therefore, conventionally, a technique in which an accumulator is provided to maintain the pressure of the hydraulic cylinder has been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-956

  However, in the thing of the said patent document 1, although it has the structure by which the stock pressure to an accumulator is performed only during the pressure oil supply to a hydraulic cylinder at the time of an exit clearance adjustment operation, an exit clearance adjustment operation is once adjusted. When it is completed, the next adjustment may not be performed for a long time. In such a case, the accumulator pressure will not be applied for a long time, and the pressure accumulated in the accumulator will be insufficient. There is a problem that it is impossible to prevent a decrease in the holding pressure, and there are problems to be solved by the present invention.

The present invention has been created in order to solve these problems in view of the above circumstances, and the invention of claim 1 is directed to a hydraulic motor for driving a jaw crusher and adjustment of an outlet clearance of the jaw crusher. In the hydraulic circuit comprising a hydraulic cylinder for holding a member, a pressure introducing circuit for introducing the driving pressure or the brake pressure of the hydraulic motor to the hydraulic cylinder is provided, and the holding pressure of the hydraulic cylinder is controlled by the pressure derived from the pressure introducing circuit. It is characterized by being configured to prevent the decrease.
By doing so, it is possible to prevent the holding pressure of the hydraulic cylinder holding the outlet clearance adjusting member from being lowered by using the driving pressure or the brake pressure of the hydraulic motor that drives the jaw crusher.
The invention of claim 2 is characterized in that, in claim 1, the high pressure side of the drive pressure or brake pressure of the hydraulic motor is inputted to the pressure introducing circuit via the shuttle valve.
In this way, the holding pressure of the hydraulic cylinder can be reduced by effectively using the drive pressure and brake pressure of the hydraulic motor.
According to a third aspect of the present invention, in the first or second aspect, the pressure introducing circuit includes a pressure control valve for adjusting a pressure guided to the hydraulic cylinder.
In this way, the pressure adjusted as the holding pressure can be introduced into the hydraulic cylinder.

  Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a self-propelled crusher. The self-propelled crusher 1 is equipped with a jaw crusher 2 described later as a crushing device, a crawler-type lower traveling body 3, an unillustrated engine and hydraulic pressure. A power chamber 4 in which a pump or the like is stored, a hopper 5 into which an object to be crushed, such as a rock or a concrete lump, is input, a vibration feeder 6 that supplies the object to be crushed into the hopper 5 to the jaw crusher 2, and the vibration feeder Side conveyor 7 that discharges dirt such as earth and sand sieved by 6, main conveyor 8 that carries out the crushed material crushed by jaw crusher 2 to the outside of the machine, magnetic separator for removing metal such as reinforcing bars from the crushed material 9 etc. are comprised.

  FIG. 2 is a diagram showing the structure of the jaw crusher 2. The jaw crusher 2 is a flywheel 11 that rotates based on the drive of the crusher hydraulic motor 10, and is offset with respect to the rotation center of the flywheel 11. An eccentric shaft 12 provided in a core shape, a swing jaw 14 that swings with the rotation of the flywheel 11 with an upper portion supported by the eccentric shaft 12 and a lower portion supported by a toggle plate 13 described later, A moving tooth 15 attached to the swing jaw 14 and a fixed tooth 16 fixed to the machine body so as to face the moving tooth 15 are used. The object to be crushed supplied to the jaw crusher 2 from the vibration feeder 6 is put between the moving tooth 15 and the fixed tooth 16 and crushed by the swing of the swing jaw 14, and passes through the exit gap S. It is configured to fall downward, and the particle size of the crushed material is determined by the size of the outlet gap S.

  Reference numeral 17 denotes an outlet gap adjusting mechanism for adjusting the outlet gap S. The outlet gap adjusting mechanism 17 is a support member that is fixed to the toggle plate 13 that supports the lower portion of the swing jaw 14 and the machine body side frame 18. 19. A toggle block 20 that is incorporated in the support member 19 so as to be movable and supports the end portion of the toggle plate 13 on the side opposite to the swing jaw support so as to be swingable, and is formed integrally with the support member 19, and is opposed to the toggle block 20. The shim receiving portion 19a, the shim 21 interposed between the shim receiving portion 19a and the toggle block 20, and the toggle block 20 are moved in a direction to be separated from and connected to the shim receiving portion 19a, and the toggle position is moved to the moving position. It is configured by a member such as an adjustment hydraulic cylinder 22 that holds the block 20. Then, by adjusting the number of shims 21 interposed between the toggle block 20 and the shim receiving portion 19a, the toggle block 20 and the swing jaw 14 supported by the toggle block 20 via the toggle plate 13 are controlled. By changing the lower position, the exit gap S formed between the moving tooth 15 and the fixed tooth 16 can be adjusted. Reference numeral 23 denotes a tension rod connected to the lower portion of the swing jaw 2, and the tension rod 23 pulls the lower portion of the swing jaw 14 toward the toggle block 20 by the urging force of the spring 24.

  Here, in the present embodiment, the toggle block 20 is separated from the shim receiving portion 19a when the adjustment hydraulic cylinder 22 is reduced, and the toggle block 20 is brought close to the shim receiving portion 19a when the adjustment hydraulic cylinder 22 is extended. It is configured. When adjusting the outlet clearance S, first, the clearance adjustment release switch (not shown) is operated with all the crushing devices such as the vibration feeder 6 and the jaw crusher 2 stopped. The hydraulic cylinder 22 is reduced to move the toggle block 20 away from the shim receiving portion 19a, and the number of shims 21 is adjusted in this state. Thereafter, the adjustment hydraulic cylinder 22 is extended by operating a gap adjustment lock switch (not shown), and the toggle block 20 is moved in the direction close to the shim receiving portion 19a. The movement of the toggle block 20 is restricted by a shim 21 sandwiched between the toggle block 20 and the shim receiving portion 19a, whereby the position of the toggle block 20 is determined and the toggle block 13 is moved to the toggle plate 13 Thus, the lower position of the swing jaw 14 supported via the bearing 15 is determined, and the exit gap S between the moving tooth 15 and the fixed tooth 16 is adjusted.

  In addition to the crusher hydraulic motor 10 and the adjusting hydraulic cylinder 22, the self-propelled crusher 1 includes left and right traveling hydraulic motors 25 and 26, a main conveyor hydraulic motor 27, and a side conveyor hydraulic motor. 28, various hydraulic actuators such as a magnetic separator hydraulic motor 29 and a vibration feeder hydraulic motor 30 are mounted. The circuit diagrams of the hydraulic system for these hydraulic actuators are shown in FIG. 3 and FIG. , 31 and 32 are variable capacity main pumps whose flow rate is controlled by load sensing control, and these main pumps 31 and 32 are configured to be driven by the power of the engine 33. In the above circuit diagram, the circled numbers are connector symbols, and the corresponding circled numbers are connected to each other. In the figure, 34 is an oil tank.

  Further, in the circuit diagram, 35 and 36 are left and right traveling control valves, 37 is a main conveyor control valve, 38 is a side conveyor control valve, 39 is a magnetic separator control valve, 40 is a crusher control valve, 41 Is a dual-purpose control valve that operates to perform oil discharge control on each hydraulic actuator based on the operation of a control tool (not shown) corresponding to these control valves 35 to 4. The flow rate is distributed to each hydraulic actuator. 35a to 41a are pressure compensating valves connected to the control valves 35 to 41.

  The dual-purpose control valve 41 is a three-position switching valve that is also used as a control valve for two types of hydraulic actuators, that is, the vibration feeder hydraulic motor 30 and the adjustment hydraulic cylinder 22. A vibration feeder that supplies the pressure oil of the main pump 32 to the vibration feeder hydraulic motor 30 from a neutral position N where no pressure oil is supplied to any of the hydraulic cylinders 22 based on the operation of a vibration feeder operation tool (not shown). Is switched to the operation position X, and the pressure oil of the main pump 32 is supplied via an adjustment electromagnetic switching valve 42, which will be described later, based on the operation of the clearance adjustment operation tool (the clearance adjustment release switch and the lock switch). It is configured to switch to the adjustment operation position Y supplied to the adjustment hydraulic cylinder 22.

  The adjustment electromagnetic switching valve 42 is a three-position switching valve arranged in an oil passage from the dual-purpose control valve 41 to the adjustment hydraulic cylinder 22, and in the non-excitation state of the expansion side solenoid 42a and the reduction side solenoid 42b, Although it is located at the neutral position N where pressure oil is not supplied to the adjustment hydraulic cylinder 22, when the gap adjustment lock switch is operated, the expansion side solenoid 42a is excited and supplied via the dual-purpose control valve 41. When the pressure oil of the main pump 32 is switched to the expansion side position X to be supplied to the head side oil chamber 22a of the adjustment hydraulic cylinder 22, and the clearance adjustment release switch is operated, the reduction side solenoid 42b is excited, The pressure oil of the main pump 32 supplied via the shared control valve 41 is switched to the reduction side position Y where the pressure oil is supplied to the rod side oil chamber 22b of the adjustment hydraulic cylinder 22.

  Here, head-side and rod-side pilot check valves 43a and 43b are respectively arranged in the oil passages from the adjustment electromagnetic switching valve 42 to the head-side oil chamber 22a and the rod-side oil chamber 22b of the adjustment hydraulic cylinder 22. Has been. The head-side pilot check valve 43a operates so as to prevent oil from being discharged from the head-side oil chamber 22a when pressure oil is not supplied from the adjusting electromagnetic switching valve 42 to the rod-side oil chamber 22b. The side pilot check valve 43b operates to prevent oil discharge from the rod side oil chamber 22b when pressure oil is not supplied from the adjustment electromagnetic switching valve 42 to the head side oil chamber 22a.

  Further, an accumulator 44 and a pressure are provided in an oil passage A (hereinafter referred to as head-side oil passage A) from the head-side pilot check valve 43a to the head-side oil chamber 22a of the adjustment hydraulic cylinder 22. A switch 45 is connected to a relief oil passage B and a pressure introduction circuit C which will be described later.

  The accumulator 44 is provided to replenish the pressure when the pressure in the head side oil chamber 22a decreases and to absorb the peak pressure generated in the head side oil chamber 22a. Further, the pressure switch 45 is for detecting an abnormal pressure increase in the head side oil chamber 22a. For example, when the jaw crusher 2 is mixed with a lump of metal or the like and cannot be discharged from the outlet gap S. In addition, the reaction force of the toggle plate 13 is received by the adjustment hydraulic cylinder 22 via the toggle block 20, and the pressure in the head side oil chamber 22a increases. In such a case, the increase in pressure is the pressure. The detection signal is input to a control device (not shown) and an alarm is output from the control device, and the operation of the crushing operation device such as the vibration feeder 6 or the ji crusher 2 is stopped. It is like that. When the alarm is issued, the outlet clearance S can be widened by reducing the adjustment hydraulic cylinder 22 and separating the toggle block 20 from the shim receiving portion 19a. Can be removed.

  The relief oil passage B is an oil passage branched from the head-side oil passage A to reach the oil tank 34, and the pressure of the head-side oil passage A is preset in the relief oil passage B. An overload relief valve 46 is provided for releasing the oil in the head side oil passage A to the oil tank 34 when the pressure exceeds a predetermined pressure.

  On the other hand, the pressure introduction circuit C is a circuit for introducing the driving pressure or brake pressure of the hydraulic motor 10 for the crusher into the head side oil passage A. The pressure introduction circuit C is introduced into the head side oil passage A. A pressure reducing valve 47 for reducing the pressure to be set to a preset pressure and a check valve 48 for preventing backflow are arranged.

  The drive pressure or brake pressure of the crusher hydraulic motor 10 is applied to the crusher supply / discharge oil passages D and E connecting the crusher control valve 40 and the input / output ports 10a and 10b of the crusher hydraulic motor 10 on the high pressure side. The pressure is input to the pressure introducing circuit C through the shuttle valve 49 to be selected. Thus, during the rotation of the crusher hydraulic motor 10, the driving pressure or the brake pressure is input from the crusher supply / discharge oil passages D and E to the pressure introduction circuit C via the shuttle valve 49, and the pressure introduction circuit C The head side oil chamber 22a is led from the head side oil passage A to the head side oil chamber 22a via the pressure reducing valve 47 and the check valve 48 disposed in the cylinder. It is configured to prevent pressure drop. In the figure, 50a and 50b are overload relief valves connected to the crusher supply / discharge oil passages D and E, and 51a and 51b are check valves for preventing vacuum.

  In the present embodiment configured as described, the jaw crusher 2 crushes the object to be crushed between the moving tooth 15 attached to the swing jaw 14 and the fixed tooth 16 fixed to the body side. However, the swing jaw 14 swings based on the drive of the crusher hydraulic motor 10, and the lower portion of the swing jaw 14 is supported by a toggle plate 13 that constitutes an outlet clearance adjustment mechanism 17. The end of the toggle plate 13 on the side opposite to the swing jaw support is supported by a toggle block 20 that is positioned and fixed by an adjustment hydraulic cylinder 22. Thus, the adjusting hydraulic cylinder 22 holds the reaction force received from the toggle plate 13 via the toggle block 20, but the pressure holding side oil chamber (head side oil chamber 22a) of the adjusting hydraulic cylinder 22 is maintained. ) Is connected to a pressure introducing circuit C that guides the drive pressure or brake pressure of the crusher hydraulic motor 10 to the adjusting hydraulic cylinder 22 during rotation of the crusher hydraulic motor 10, and is introduced from the pressure introducing circuit C. It is possible to prevent the holding pressure of the adjusting hydraulic cylinder 22 from being lowered by the pressurized oil.

  As a result, even if the outlet clearance adjustment operation is not performed for a long period of time and the pressure oil supply from the main pump 32 to the adjustment hydraulic cylinder 22 or the accumulator 44 is not performed for a long period of time, the driving pressure or brake of the crusher hydraulic motor 10 is not performed. The pressure can be used to prevent the holding pressure of the adjustment hydraulic cylinder 22 from being lowered, and thus the toggle block 20 can be reliably positioned and fixed by the adjustment hydraulic cylinder 22. Further, when the holding pressure of the adjustment hydraulic cylinder 22 decreases while the crusher hydraulic motor 10 is stopped, the hydraulic oil is replenished from the accumulator 44 to the adjustment hydraulic cylinder 22, but in this embodiment, the accumulator is used. Since the drive pressure or brake pressure of the crusher hydraulic motor 10 is also introduced from the pressure introduction circuit C to 44, it is possible to prevent the accumulation pressure of the accumulator 44 from being insufficient.

  Moreover, since the pressure introducing circuit C is provided with a pressure reducing valve 47 for reducing the driving pressure or brake pressure of the crusher hydraulic motor 10 to a set pressure, an appropriate pressure as a holding pressure is applied to the adjusting hydraulic cylinder 22. Can be introduced.

  Further, in the present embodiment, the pressure introducing circuit C is configured to receive the high pressure side of the driving pressure or the brake pressure of the crusher hydraulic motor 10 via the shuttle valve 49, so that only the driving pressure is input. However, the brake pressure can also be used effectively, but the present invention is not limited to this, and it is also possible to adopt a configuration in which only the driving pressure is input to the pressure introducing circuit C.

  Further, the pressure oil for expanding and contracting the adjusting hydraulic cylinder 22 is supplied from the main pump 32 via the dual control valve 41 and the adjusting electromagnetic switching valve 42, and thus the adjusting hydraulic pressure Although a pump dedicated to the cylinder 22 is not required, it is possible to contribute to cost reduction. In this case, the adjustment work of the outlet gap S performed by expanding and contracting the adjustment hydraulic cylinder 22, the vibration feeder 6, the jaw crusher 2, etc. The crushing operation is not performed at the same time, and pressure oil for preventing a decrease in the holding pressure of the adjusting hydraulic cylinder 22 is supplied via the dual control valve 41 and the adjusting electromagnetic switching valve 42 during the crushing operation. Therefore, the dual control valve 41 can be used as a control valve for two types of hydraulic actuators, that is, the adjustment hydraulic cylinder 22 and the vibration feeder hydraulic motor 30. It can contribute to the combined reduction.

  Of course, the present invention is not limited to the above-described embodiment, and a jaw crusher in which the structure of the outlet gap adjusting mechanism for adjusting the outlet gap between the moving tooth and the fixed tooth is different from that of the above-described embodiment. For example, a structure in which the toggle block is separated from the shim receiving portion by extension of the hydraulic cylinder and is brought close by reduction of the hydraulic cylinder, or a moving hydraulic cylinder and a fixing hydraulic cylinder for the toggle block are provided separately. Needless to say, the present invention can be implemented even if it is a slab.

It is a figure which shows the structure of a self-propelled crusher. It is a figure which shows the structure of a jaw crusher. It is a circuit diagram which shows the hydraulic system of a self-propelled crusher. It is a circuit diagram which shows the hydraulic system of a self-propelled crusher.

Explanation of symbols

2 Jaw crusher 10 Crusher hydraulic motor 13 Toggle plate (exit clearance adjustment member)
20 Toggle block (exit clearance adjustment member)
22 Hydraulic cylinder for adjustment 47 Pressure reducing valve (pressure control valve)
49 Shuttle valve C Pressure introduction circuit

Claims (3)

  In a hydraulic circuit comprising a hydraulic motor that drives the jaw crusher and a hydraulic cylinder that holds an outlet gap adjusting member of the jaw crusher, a pressure introducing circuit that guides the drive pressure or brake pressure of the hydraulic motor to the hydraulic cylinder is provided, A jaw crusher hydraulic circuit characterized in that a decrease in holding pressure of the hydraulic cylinder is prevented by pressure introduced from the pressure introducing circuit.   2. The jaw crusher hydraulic circuit according to claim 1, wherein a high pressure side of a drive pressure or a brake pressure of the hydraulic motor is inputted to the pressure introducing circuit via a shuttle valve.   3. The hydraulic circuit for a jaw crusher according to claim 1, wherein the pressure introducing circuit includes a pressure control valve for adjusting a pressure guided to the hydraulic cylinder.

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