Jaw crusher discharge port adjusting hydraulic system

Abstract

The invention discloses a jaw crusher discharge port adjusting hydraulic system, a jaw crusher discharge port is arranged between a movable jaw and a fixed jaw, a bracket and a tension device are also arranged on a rack of a jaw crusher, the bracket is connected with the movable jaw and is used for adjusting the size of the jaw crusher discharge port, and the tension device is used for adjusting the fitting degree between the movable jaw and the bracket; the hydraulic system is used for adjusting the toggle plate and the tension device so as to dynamically adjust the feed port; the hydraulic system comprises: a toggle plate adjustment circuit for adjusting the position of the toggle plate; the pressurizing loop is used for maintaining the pressure of the hydraulic system; and the circulating cooling loop is used for cooling the tensioning device. When the jaw crusher works, the discharge port can be calibrated and displayed according to the displacement sensor; the tensioning device is automatically adjusted to a preset state; the oil cylinder is cooled by circulating oil, so that reliable operation of the tensioning oil cylinder is ensured, and the operation efficiency of the crusher is greatly improved; during maintenance, the movable jaw can be jacked up, and the toggle plate can be taken out conveniently.

Description

Technical Field

[0001] The invention relates to the field of jaw crushers, and in particular to a jaw crusher discharge port adjustment hydraulic system and a control method. Background Art

[0002] Jaw crushers are widely used in mining, aggregate and other industries to crush various ores and bulk materials. The size of the crusher discharge port is the key factor in determining the particle size of the crushed product.

[0003] The movable jaw of the crusher is connected to the frame of the machine body through the bearing seat, and the movable jaw is suspended in the machine body. A device for adjusting the size of the discharge port is installed at the rear of the machine body, that is, a pair of wedges are installed at the rear of the toggle plate seat. By changing the relative position of the wedges, the thickness of the wedge group can be changed, thereby adjusting the size of the discharge port. In addition, in order to prevent the toggle plate from falling off and play a buffering role, the crusher is also equipped with a tensioning device.

[0004] At present, the size of the discharge port is mainly adjusted by mechanical adjustment and hydraulic adjustment. The mechanical adjustment method has been gradually eliminated due to its time-consuming, labor-intensive and low efficiency. The hydraulic adjustment method is fast, safe and highly mechanized, but it still has problems such as the need to stop the machine during adjustment and low efficiency. The discharge port adjustment usually has no size display, and the discharge port display function needs to be added; the passive jaw pressure of the toggle plate is not easy to replace; the tension cylinder has high-frequency movement, and the high temperature problem of the tension cylinder needs to be solved. Summary of the invention

[0005] The object of the present invention is to provide a jaw crusher discharge opening adjustment hydraulic system, which can be used for jaw crusher discharge opening calibration and correction.

[0006] A hydraulic system for adjusting the discharge port of a jaw crusher, wherein the discharge port of the jaw crusher is arranged between the movable jaw and the fixed jaw, and a toggle plate and a tensioning device are also arranged on the frame of the jaw crusher, wherein the toggle plate is connected to the movable jaw and is used to adjust the size of the discharge port of the jaw crusher, and the tensioning device is used to adjust the fit between the movable jaw and the toggle plate; the hydraulic system is used to adjust the toggle plate and the tensioning device to dynamically adjust the feed port; The hydraulic system comprises: Bracket adjustment circuit, used to adjust the position of the bracket; Charging circuit, used to maintain the pressure of the hydraulic system; A circulating cooling circuit is used to cool the tensioning device.

[0007] Further, the toggle plate is adjusted in position by a pair of wedge blocks; The toggle plate adjustment circuit includes an electric motor, a hydraulic pump, an oil suction filter, a high-pressure filter, a wedge block adjustment cylinder, a displacement sensor, a tension cylinder, an accumulator, a pressure gauge, and a pressure sensor which sequentially form a circuit.

[0008] Furthermore, the toggle plate adjustment circuit is provided with a diverter valve to ensure that the distances between the two wedge blocks and the center of the crusher body are the same after adjustment.

[0009] Furthermore, a bidirectional hydraulic lock is provided in the toggle plate adjustment circuit to prevent leakage of the adjustment circuit.

[0010] Furthermore, the pressure charging circuit is provided with a pressure sensor to monitor the oil pressure of the tensioning cylinder in real time. When the oil pressure changes, the circuit switches to the charging, depressurizing or stopping state according to the set program; The charging circuit is provided with an electromagnetic one-way valve as a channel for positive charging and reverse pressure relief; The charging circuit is provided with a safety valve as a backup channel for pressure relief; The charging circuit is provided with an accumulator to maintain the oil pressure in the rod chamber of the tensioning oil cylinder; A pressure sensor is installed at the oil pump outlet for calibrating the discharge port.

[0011] Furthermore, the rodless chamber of the tensioning oil cylinder is provided with a unloading electromagnetic one-way valve and a one-way valve for toggle plate replacement and circulating oil control; when the tensioning oil cylinder is circulating oil for cooling, oil is fed from one oil port of the rodless chamber and returned from another oil port; a cooler is provided on the oil return line of the rodless chamber of the tensioning cylinder for cooling the circulating oil; Furthermore, the rodless chamber of the tensioning cylinder is provided with an oil suction check valve for sucking oil from the oil tank; Furthermore, the wedge adjustment cylinder is equipped with a displacement sensor for calibration and display of the discharge port.

[0012] Furthermore, the hydraulic system is provided with three working modes: manual adjustment mode, automatic charging mode and maintenance mode.

[0013] Compared with the prior art, the beneficial effects of the present invention are that, when the jaw crusher is operating, the discharge port can be calibrated according to the displacement sensor, and the tensioning device can be automatically adjusted to a preset state; the cylinder is cooled by circulating oil to ensure reliable operation of the tensioning cylinder, thereby greatly improving the operating efficiency of the crusher; during maintenance, the movable jaw can be lifted up to facilitate the removal of the toggle plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the hydraulic system of the present invention.

[0015] In the figure: 1. Suction filter, 2. Electric motor, 3. Hydraulic pump, 4. High-pressure filter, 5. Solenoid unloading valve, 6. Adjustment solenoid reversing valve, 7. Two-way hydraulic lock, 8. First diverter valve, 9. Pressure sensor, 10. Displacement sensor, 11. Wedge adjustment cylinder, 12. Accumulator, 13. Tension cylinder, 14. Pressure gauge, 15. Safety valve, 16. First solenoid one-way valve, 17. Diverter valve, 18. Second solenoid one-way valve, 19. Charging solenoid reversing valve, 20. First one-way valve, 21. Second one-way valve, 22. Overflow valve, 23. Cooler. DETAILED DESCRIPTION

[0016] Reference Figure 1 , a hydraulic system for adjusting the discharge port of a jaw crusher, wherein the discharge port of the jaw crusher is arranged between the movable jaw and the fixed jaw, and a toggle plate and a tensioning device are also arranged on the frame of the jaw crusher, wherein the toggle plate is connected with the movable jaw and is used to adjust the size of the discharge port of the jaw crusher, and the tensioning device is used to adjust the fit between the movable jaw and the toggle plate; characterized in that the hydraulic system is used to adjust the toggle plate and the tensioning device to dynamically adjust the feed port; The hydraulic system comprises: Bracket adjustment circuit, used to adjust the position of the bracket; Charging circuit, used to maintain the pressure of the hydraulic system; A circulating cooling circuit is used to cool the tensioning device.

[0017] Further, the toggle plate is adjusted in position by a pair of wedge blocks; The toggle plate adjustment circuit includes an electric motor 2, a hydraulic pump 3, an oil suction filter 1, a high-pressure filter 4, a wedge adjustment cylinder 11, a displacement sensor 10, a tensioning cylinder 13, an accumulator 12, a pressure gauge 14, and a pressure sensor 9, which sequentially form a circuit.

[0018] Furthermore, an electromagnetic unloading valve 5 and a relief valve 22 are also provided in the pressure charging circuit.

[0019] Furthermore, the toggle plate adjustment circuit is provided with a first diverter valve 8 to ensure that the distances between the two wedge blocks and the center of the crusher body after adjustment are the same.

[0020] Furthermore, a bidirectional hydraulic lock is provided in the toggle plate adjustment circuit to prevent leakage of the adjustment circuit.

[0021] Furthermore, the pressure charging circuit is provided with a pressure sensor 9 to monitor the oil pressure of the tensioning cylinder in real time. When the oil pressure changes, the circuit switches to the charging, depressurizing or stopping state according to the set program; The charging circuit is provided with an electromagnetic one-way valve 16 as a channel for positive charging and reverse pressure relief; The charging circuit is provided with a safety valve 15 as a backup channel for pressure relief; The charging circuit is provided with an accumulator 12, which can maintain the oil pressure in the rod chamber of the tensioning oil cylinder; A pressure sensor is installed at the oil pump outlet for calibrating the discharge port.

[0022] Furthermore, the rodless chamber of the tensioning oil cylinder 13 is provided with a unloading electromagnetic one-way valve 16 and a one-way valve for toggle plate replacement and circulating oil control; when the tensioning oil cylinder circulates oil for cooling, oil is fed from one oil port of the rodless chamber and returned from the other oil port; a cooler is provided on the oil return line of the rodless chamber of the tensioning oil cylinder 13 for cooling the circulating oil; Furthermore, the rodless chamber of the tensioning oil cylinder 13 is provided with an oil suction check valve for sucking oil from the oil tank; Furthermore, the wedge adjustment cylinder 11 is equipped with a displacement sensor 10 for calibration and display of the discharge port.

[0023] Furthermore, the hydraulic system is provided with three working modes: manual adjustment mode, automatic charging mode and maintenance mode.

[0024] The present invention sets three working modes: manual adjustment mode, automatic pressure charging mode and maintenance mode, and adopts PLC electrical control.

[0025] Manual adjustment mode: This mode is used for the crusher shutdown and maintenance. The hydraulic pump 3 and each solenoid valve can be operated individually by buttons to control the action of each cylinder separately.

[0026] Automatic charging mode: After turning on this mode, the tension cylinder 13 is charged to the specified value before the crusher can be started (the manual adjustment mode is invalid in this mode and cannot be adjusted manually). When the pressure sensor 9 detects that the pressure is lower than P1, the motor 2 works and the hydraulic pump 3 starts to supply oil to the hydraulic system. At this time, the electromagnets DT3 and DT5 are energized, and the pressure oil is charged to the tension cylinder 13 through the charging electromagnetic reversing valve, the second diverter valve 17, and the electromagnetic check valve 16. When the pressure sensor 9 detects that the pressure reaches P2, the electromagnets DT3 and DT5 lose power, cut off the charging circuit, and the motor 2 loses power after 5 seconds, and the hydraulic pump 3 stops running. If the charging time exceeds 3 minutes and the set pressure is not reached, the system starts to alarm (only alarm, not stop charging), indicating that the hydraulic system is faulty and the crusher needs to be stopped. When the crusher is working, if the pressure sensor 9 detects that the pressure reaches P3, the electromagnet DT6 or DT7 is energized, the pressure relief circuit is opened, and the pressure relief begins. If the pressure relief circuit is blocked, the safety valve 15 opens to relieve the pressure. When the pressure sensor 9 detects that the pressure reaches P2, the electromagnet DT6 or DT7 loses power, cuts off the pressure relief circuit, and stops the pressure relief. When the main engine is running, the lubrication pump runs, the electromagnet DT4 is energized, and the hydraulic oil circulates in the tensioning cylinder 13 to cool the tensioning cylinder 13. When the main engine is running, the lubrication pump is turned off, the electromagnet DT4 is de-energized, the tensioning cylinder 13 reciprocates, and the oil is sucked from the oil tank through the second one-way valve 21, and returns to the oil tank through the second electromagnetic one-way valve 18, the first one-way valve 20, and the cooler 23 to cool the tensioning cylinder 13.

[0027] Maintenance mode: This mode needs to be started when the discharge port needs to be calibrated. Press the button to reduce the discharge port, and the wedge block moves relatively under the traction of the adjustment cylinder, thereby reducing the size of the discharge port. When the actual discharge port becomes zero, the pressure of the pressure sensor 9 changes sharply. At this time, the program recalibrates the discharge port to zero. Press the button to reduce the discharge port, the electromagnets DT1 and DT3 are energized, and the pressure oil reaches the rodless chamber of the wedge block adjustment cylinder 11 through the adjustment electromagnetic reversing valve 6, the two-way hydraulic lock 7, and the first diverter valve 8. Press the button to increase the discharge port, the electromagnets DT2 and DT3 are energized, and the pressure oil reaches the rod chamber of the wedge block adjustment cylinder 11. The PLC automatically calculates the size of the discharge port after adjustment according to the changes of the displacement sensor 10 on the cylinder. When the hydraulic oil passes through the first diverter valve 8, the flow rate entering the cylinders on both sides remains consistent. When the toggle plate needs to be replaced, press the button to start the movable jaw, and the electromagnets DT3, DT4, DT6, DT7, and DT8 are energized. After the movable jaw is lifted, the toggle plate can be easily replaced.

[0028] It should be noted that the purpose of the present invention is to provide a jaw crusher discharge port adjustment hydraulic system, which can calibrate the discharge port according to the displacement sensor 10 and display the discharge port; and automatically adjust the tensioning device to a preset state; cool the cylinder through circulating oil to ensure the reliable operation of the tensioning cylinder; during maintenance, the movable jaw can be lifted up to facilitate the removal of the toggle plate, thereby greatly improving the equipment maintenance efficiency.

Claims

1. A hydraulic system for adjusting the discharge port of a jaw crusher, wherein the discharge port of the jaw crusher is arranged between the movable jaw and the fixed jaw, and a toggle plate and a tensioning device are also arranged on the frame of the jaw crusher, wherein the toggle plate is connected to the movable jaw and is used to adjust the size of the discharge port of the jaw crusher, and the tensioning device is used to adjust the fit between the movable jaw and the toggle plate; characterized in that: The hydraulic system is used to adjust the toggle plate and the tensioning device to dynamically adjust the feed opening; The hydraulic system comprises: Bracket adjustment circuit, used to adjust the position of the bracket; Charging circuit, used to maintain the pressure of the hydraulic system; A circulating cooling circuit is used to cool the tensioning device.

2. A jaw crusher discharge port adjustment hydraulic system according to claim 1, characterized in that: The toggle plate is adjusted in position by a pair of wedges; The toggle plate adjustment circuit includes an electric motor, a hydraulic pump, an oil suction filter, a high-pressure filter, a wedge block adjustment cylinder, a displacement sensor, a tension cylinder, an accumulator, a pressure gauge, and a pressure sensor which sequentially form a circuit.

3. A jaw crusher discharge port adjustment hydraulic system according to claim 2, characterized in that: The toggle plate adjustment circuit is provided with a first diverter valve to ensure that the distances between the two wedge blocks after adjustment and the center of the crusher body are the same.

4. A jaw crusher discharge port adjustment hydraulic system according to claim 3, characterized in that: The toggle plate adjustment circuit is provided with a bidirectional hydraulic lock to prevent leakage of the adjustment circuit.

5. A jaw crusher discharge port adjustment hydraulic system according to claim 1, characterized in that: The pressure charging circuit is provided with a pressure sensor to monitor the oil pressure of the tensioning cylinder in real time. When the oil pressure changes, the circuit switches to the charging, depressurizing or stopping state according to the set program; The charging circuit is provided with an electromagnetic one-way valve as a channel for positive charging and reverse pressure relief; The charging circuit is provided with a safety valve as a backup channel for pressure relief; The charging circuit is provided with an accumulator to maintain the oil pressure in the rod chamber of the tensioning oil cylinder; A pressure sensor is installed at the oil pump outlet for calibrating the discharge port.

6. A jaw crusher discharge port adjustment hydraulic system according to claim 5, characterized in that: The rodless chamber of the tensioning cylinder is provided with an electromagnetic one-way valve and a one-way valve for toggle plate replacement and circulating oil control; when the tensioning cylinder circulates oil for cooling, oil is taken in from one oil port of the rodless chamber and returned from the other oil port; a cooler is provided on the oil return line of the rodless chamber of the tensioning cylinder for cooling the circulating oil.

7. A jaw crusher discharge port adjustment hydraulic system according to claim 1, characterized in that: The rodless chamber of the tensioning cylinder is provided with an oil suction check valve for sucking oil from the oil tank.

8. A jaw crusher discharge port adjustment hydraulic system according to claim 2, characterized in that: The wedge adjustment cylinder is equipped with a displacement sensor for calibration and display of the discharge port.

9. A jaw crusher discharge port adjustment hydraulic system according to claim 1, characterized in that: The hydraulic system is provided with three working modes: manual adjustment mode, automatic pressure charging mode and maintenance mode.

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