An excavator crushing system and a control method thereof

Abstract

A kind of excavator crushing system and its control method, including main pump, main pump is double pump including pump I, pump II and pilot pump, the oil outlet of pump I and pump II is respectively connected in the two oil inlets of hydraulic directional control valve, the oil outlet of hydraulic directional control valve is connected with breaking hammer, pressure sensor is arranged on the pipeline connected with hydraulic directional control valve and breaking hammer;It further includes the pilot control system for providing hydraulic control pressure oil for hydraulic directional control valve, the pilot control system includes the on-off valve connected with pilot pump and electromagnetic reversing device, the two output ends of electromagnetic reversing device are respectively connected with the two control ends of hydraulic directional control valve;It further includes controller.The present application is provided with two pumps and the control system for controlling two pumps, by control strategy, control double pump alternately according to requirement, realize balanced distribution double pump's use rate and main pump load, reduce failure rate, improve the use efficiency of double pump and the safety of system.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to an excavator crushing system and its control method. Background Technology

[0002] Excavators are commonly used construction machinery in engineering projects, and hydraulic breakers, as one of the most common accessories for excavators, are widely used in mining, railway, highway, and municipal work. In existing crushing operations, to increase the overall machine's working speed, a dual-pump confluence method is used to increase the input flow of the actuator. However, current equipment often encounters two situations under crushing conditions: one is that one pump has a high utilization rate while the other has a low utilization rate, resulting in an inefficient use of both pumps and a high overall pump failure rate; the other is that the crushing operation involves large load variations and significant impacts, leading to a higher failure rate of the main valve. Both of these situations are detrimental to improving system efficiency and failing to fully utilize the benefits of dual-pump confluence. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an excavator crushing system and its control method that are simple in structure and have good effect.

[0004] The present invention is achieved by the following technical solution: an excavator breaking system, including a main pump, wherein the main pump is a dual pump including pump I, pump II and pilot pump, the oil outlet of the main pump is connected to a hydraulic directional valve, the oil outlets of pump I and pump II are respectively connected to the two oil inlets of the hydraulic directional valve, the oil outlet of the hydraulic directional valve is connected to a breaker hammer, and a pressure sensor is provided on the pipeline connecting the hydraulic directional valve and the breaker hammer; It also includes a pilot control system that provides hydraulic pressure oil to the hydraulic directional valve. The pilot control system includes a switching valve connected to the pilot pump and an electromagnetic directional device. The switching valve inputs the pilot pressure oil to the electromagnetic directional device. The electromagnetic directional device has two output terminals, which are respectively connected to the two control terminals of the hydraulic directional valve. It also includes a controller, with the pressure sensor connected to the input of the controller, and the main pump and electromagnetic commutation device connected to the output of the controller.

[0005] Furthermore, the hydraulic directional valve is a three-position three-way hydraulically controlled directional valve.

[0006] An overflow valve is provided between the oil inlet end of the hydraulic breaker and the oil return tank.

[0007] The switching valve is a one-way foot valve.

[0008] The electromagnetic reversing device is a three-position three-way electromagnetic reversing valve, and the two control terminals of the three-position three-way electromagnetic reversing valve are connected to the controller.

[0009] The electromagnetic reversing device is a pilot solenoid valve group, which includes solenoid valve I and solenoid valve II. The input terminals of solenoid valve I and solenoid valve II are connected to the output terminals of the switching valve. The output terminals of solenoid valve I and solenoid valve II are respectively connected to the two control terminals of the hydraulic reversing valve. The control terminals of solenoid valve I and solenoid valve II are connected to the controller.

[0010] Solenoid valve I and solenoid valve II are two-position three-way solenoid directional valves.

[0011] A control method for an excavator's crushing system includes the following steps: S1. Entering crushing mode, one control terminal of the electromagnetic commutation device is energized; S2. Open the switch valve. The pilot hydraulic oil flows to the left control end of the hydraulic directional valve after passing through the switch valve and the solenoid reversing device. The hydraulic directional valve switches from the neutral position to the left position. S3. The high-pressure oil output by pump II acts on the oil inlet of the breaker through the hydraulic reversing valve, and the breaker works normally. S4. After the pressure sensor collects the pressure signal, it transmits the signal to the controller. The controller starts timing. After working time T hours, the controller outputs a control signal to energize the other control terminal of the electromagnetic commutator, changing the oil outlet of the electromagnetic commutator. The controller then starts timing. S5. The pilot hydraulic oil flows to the right control end of the hydraulic directional valve, and the hydraulic directional valve switches from the neutral position to the right position. S6. The high-pressure oil output by pump I acts on the oil inlet of the breaker through the hydraulic reversing valve, and the breaker works normally. S7. After working time T hours, the controller outputs a control signal to change the oil outlet of the electromagnetic commutator, and the controller starts timing. S8. After every working time T hours, the controller outputs a control signal to change the oil outlet of the electromagnetic reversing device. At the same time, the controller starts timing until the switch valve is closed. After the pressure sensor can no longer collect the pressure signal, the controller does not output an electrical signal to the electromagnetic reversing device to reverse. The hydraulic reversing valve is in the middle position and stops working.

[0012] It also includes a control strategy. The controller outputs a control signal to pump I. After receiving the control signal, pump I outputs X% power and feeds back the working time T hours to the controller. The controller then outputs a control signal to pump II. After receiving the control signal, pump II outputs X% power and feeds back the working time T hours to the controller. By repeating the above cycle, the total output power of pump I and pump II can be kept basically the same.

[0013] The present invention has the following advantages: The excavator crushing system and its control method of the present invention are provided with two pumps and a control system for controlling the two pumps. Through the control strategy, the two pumps are controlled to work alternately as required, so as to achieve a balanced distribution of the utilization rate of the two pumps and the load of the main pump, reduce the failure rate, improve the utilization efficiency of the two pumps and the safety of the system. At the same time, in the crushing condition, the source of the hydraulic oil for the breaker hammer is controlled by the hydraulic reversing valve instead of the main valve, thereby reducing the utilization rate of the main valve and improving the reliability of the main valve. Attached Figure Description

[0014] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0015] In the attached diagram: Figure 1 This is a hydraulic schematic diagram of the present invention; Figure 2 and Figure 3 This is a hydraulic schematic diagram of the present invention under different working conditions.

[0016] In the diagram: 1. Main pump, 101. Pump I, 102. Pump II, 2. Hydraulic directional valve, 3. Overflow valve, 4. Hydraulic breaker, 5. Pressure sensor, 6. One-way foot valve, 7. Controller, 8. Oil tank, 9. Pilot solenoid valve assembly, 91. Solenoid valve I, 92. Solenoid valve II.

[0017] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figures 1 to 3 The excavator breaking system shown includes a main pump 1, which is a dual-pump system comprising pump I 101, pump II 102, and a pilot pump. A hydraulic directional valve 2 is connected to the oil outlet of the main pump 1. The oil outlets of pump I 101 and pump II 102 are respectively connected to the two oil inlets of the hydraulic directional valve 2. A breaker hammer 4 is connected to the oil outlet of the hydraulic directional valve 2. A pressure sensor 5 is installed on the pipeline connecting the hydraulic directional valve 2 and the breaker hammer 4. The system also includes a pilot control system that provides hydraulic pressure oil to the hydraulic directional valve 2. The pilot control system includes a switching valve connected to the pilot pump and an electromagnetic reversing device. The switching valve inputs pilot pressure oil to the electromagnetic reversing device, which has two output terminals, each connected to a control terminal of the hydraulic directional valve 2. Finally, the system includes a controller 7. The pressure sensor 5 is connected to the input terminal of the controller 7, and the main pump 1 and the electromagnetic reversing device are connected to the output terminal of the controller 7. The hydraulic breaker of this invention is powered by two pumps alternately. A hydraulic directional valve is installed between the breaker and the two pumps. The pilot hydraulic oil has two working positions, one connected to the breaker and the other to one of the pumps. The hydraulic directional valve changes its working position under the action of the pilot hydraulic oil, allowing the two pumps to alternately connect to the breaker. The pilot hydraulic oil for the hydraulic directional valve is supplied by a pilot control system. The pilot control system includes a switching valve connected to the pilot pump and an electromagnetic reversing device. The switching valve determines whether pilot hydraulic oil is supplied to the pilot control system. The electromagnetic reversing device has two output terminals, each connected to one of the two hydraulic control terminals of the hydraulic directional valve. The electromagnetic reversing device determines which output terminal outputs pilot hydraulic oil, thereby achieving hydraulic reversal. Valve control also includes a controller, which connects a pressure sensor and an electromagnetic reversing device. The pressure sensor outputs a pressure oil signal from the inlet of the hydraulic breaker, and the controller outputs an electrical signal to control which output end of the electromagnetic reversing device outputs pilot pressure oil. After receiving the pressure signal from the pressure sensor, the controller starts timing. After the set time is reached, the controller outputs an electrical signal to the electromagnetic reversing device to change the output end of the pilot hydraulic oil, control the hydraulic reversing valve to switch, and thus adjust the pump supplying oil to the hydraulic breaker. After the next set time is completed, the oil supply pump is changed again, realizing the alternating operation of the two pumps, achieving a balanced distribution of the utilization rate of the two pumps and the load of the main pump, reducing the failure rate, improving the efficiency of the two pumps and the safety of the system.

[0022] like Figures 1 to 3 The excavator breaking system shown is described, wherein the hydraulic directional valve 2 is a three-position three-way hydraulically controlled directional valve. The two input ends of the hydraulic directional valve are respectively connected to two pumps, and the output end is connected to the breaker hammer. In the left working position, pump I is connected to the breaker hammer, and in the right working position, pump II is connected to the breaker hammer. By alternating the working positions of the hydraulic directional valve, the two pumps can work alternately.

[0023] like Figures 1 to 3 The excavator breaking system shown has an overflow valve 3 between the oil inlet end of the breaker 4 and the oil return tank.

[0024] like Figures 1 to 3 The excavator crushing system shown is a one-way foot valve 6. The switching valve of this invention can be a one-way foot valve, a manual one-way valve, or an electrically controlled one-way valve.

[0025] like Figures 1 to 3 The excavator crushing system shown includes a three-position, three-way electromagnetic directional valve as the electromagnetic reversing device. The two control terminals of the three-position, three-way electromagnetic directional valve are connected to a controller. When the electromagnetic reversing device of this invention is a three-position, three-way electromagnetic directional valve, the controller outputs an electrical signal to control the reversing of the electromagnetic directional valve, thereby changing the output of the pilot hydraulic oil.

[0026] like Figures 1 to 3 The excavator crushing system shown includes an electromagnetic reversing device, a pilot solenoid valve group 9, comprising solenoid valve I 91 and solenoid valve II 92. The input terminals of solenoid valves I 91 and II 92 are connected to the output terminals of a switching valve. The output terminals of solenoid valves I 91 and II 92 are respectively connected to the two control terminals of a hydraulic directional valve 2. The control terminals of solenoid valves I 91 and II 92 are connected to a controller. Solenoid valves I 91 and II 92 are two-position three-way electromagnetic directional valves.

[0027] A control method for an excavator's crushing system includes the following steps: S1. Entering crushing mode, one control terminal of the electromagnetic commutation device is energized; S2. Open the switch valve. The pilot hydraulic oil flows to the left control end of the hydraulic directional valve 2 after passing through the switch valve and the solenoid reversing device. The hydraulic directional valve 2 switches from the middle position to the left position. S3. The high-pressure oil output by pump II102 acts on the oil inlet of the breaker 4 through the hydraulic reversing valve 2, and the breaker 4 works normally. S4. After the pressure sensor 5 collects the pressure signal, it transmits the signal to the controller 7. The controller 7 starts timing. After working time T hours, the controller 7 outputs a control signal to energize the other control terminal of the electromagnetic commutation device, changing the oil outlet of the electromagnetic commutation device. The controller then starts timing. S5. The pilot hydraulic oil flows to the right control end of the hydraulic directional valve (2), and the hydraulic directional valve (2) switches from the middle position to the right position. S6. The high-pressure oil output by pump I101 acts on the oil inlet of the breaker 4 through the hydraulic reversing valve 2, and the breaker 4 works normally. S7. After working time T hours, controller 7 outputs a control signal to change the oil outlet of the electromagnetic commutation device, and at the same time the controller starts timing. S8. After every working time T hours, the controller 7 outputs a control signal to change the oil outlet of the electromagnetic reversing device. At the same time, the controller starts timing until the switch valve is closed. After the pressure sensor 5 no longer collects the pressure signal, the controller 7 does not output an electrical signal to the electromagnetic reversing device to reverse the direction. The hydraulic reversing valve 2 is in the middle position and stops working.

[0028] Specifically, when the electromagnetic commutation device is a pilot-operated solenoid valve assembly, the control method is as follows: Upon entering crushing mode, pilot solenoid valve group Y1 is energized, operating the check valve. Pilot oil flows through the check valve and pilot solenoid valve group A1, then acts on the hydraulic directional valve X1. The hydraulic directional valve switches from the neutral position to the left position. High-pressure oil output from pump II flows through the hydraulic directional valve to the breaker's oil port P, and simultaneously acts on the pressure sensor. The pressure sensor transmits a signal to the controller, which starts timing. Hydraulic oil returns to the oil tank through the breaker's oil port T, and the breaker operates normally. After working time T hours, the controller outputs a control signal to de-energize pilot solenoid valve group Y1 and energize Y2. Simultaneously, the controller starts timing again, and pilot oil flows through pilot solenoid valve group A2, then acts on the hydraulic directional valve X1. When the hydraulic directional valve switches from the neutral position to the right position, the high-pressure oil output from pump I passes through the hydraulic directional valve and acts on the hydraulic breaker's oil port P. The hydraulic oil returns to the oil tank through the hydraulic breaker's oil port T, and the hydraulic breaker operates normally. When the controller has timed for T hours, it sends an electrical signal again to control the pilot solenoid valve group to change the outlet of the pilot pressure oil, changing the working position of the hydraulic directional valve and switching different pumps to work until the work is completed. Then, the check valve is operated to cut off the pilot hydraulic oil, and the hydraulic directional valve is in the neutral position. At this time, the pressure sensor does not detect a pressure signal. The controller judges based on the input signal of the pressure sensor and stops sending electrical signals to the pilot solenoid valve group. The system work is completed. It also includes a control strategy. Controller 7 outputs a control signal to pump I 101. After receiving the control signal, pump I 101 outputs X% power and feeds back the working time T hours to controller 7. Controller 7 then outputs a control signal to pump II 102. After receiving the control signal, pump II 102 outputs X% power and feeds back the working time T hours to controller 7. This cycle repeats until the total output power of pump I 101 and pump II 102 remains basically the same.

[0029] The excavator crushing system and its control method of the present invention, under crushing conditions, rationally use dual pumps, with equal utilization of each pump, reduce the failure rate of each pump, and improve the overall reliability of the pumps and main valve.

[0030] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0031] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A control method for an excavator crushing system, characterized in that: The system includes a main pump (1), which is a dual pump including pump I (101), pump II (102) and pilot pump. The oil outlet of the main pump (1) is connected to a hydraulic directional valve (2). The oil outlets of pump I (101) and pump II (102) are respectively connected to the two oil inlets of the hydraulic directional valve (2). The oil outlet of the hydraulic directional valve (2) is connected to a breaker hammer (4). A pressure sensor (5) is provided on the pipeline connecting the hydraulic directional valve (2) and the breaker hammer (4). It also includes a pilot control system that provides hydraulic pressure oil to the hydraulic directional valve (2). The pilot control system includes a switching valve connected to the pilot pump and an electromagnetic switching device. The switching valve inputs the pilot pressure oil to the electromagnetic switching device. The electromagnetic switching device has two output terminals, which are respectively connected to the two control terminals of the hydraulic directional valve (2). It also includes a controller (7), the pressure sensor (5) is connected to the input end of the controller (7), and the main pump (1) and the electromagnetic reversing device are connected to the output end of the controller (7); The electromagnetic reversing device is a three-position three-way electromagnetic reversing valve, and the two control terminals of the three-position three-way electromagnetic reversing valve are connected to the controller. The method includes the following steps: S1. Entering crushing mode, one control terminal of the electromagnetic commutation device is energized; S2. Open the switch valve. The pilot hydraulic oil flows to the left control end of the hydraulic directional valve (2) after passing through the switch valve and the electromagnetic reversing device. The hydraulic directional valve (2) switches from the middle working state to the left working state. S3, the high-pressure oil output by pump II (102) is applied to the oil inlet of the breaker (4) through the hydraulic reversing valve (2), and the breaker (4) works normally; S4. After the pressure sensor (5) collects the pressure signal, it transmits the signal to the controller (7). The controller (7) starts timing. After working time T hours, the controller (7) outputs a control signal to energize the other control terminal of the electromagnetic commutator, changes the oil outlet of the electromagnetic commutator, and the controller starts timing. S5. The pilot hydraulic oil flows to the right control end of the hydraulic directional valve (2), and the hydraulic directional valve (2) switches from the middle position to the right position. S6. The high-pressure oil output by pump I (101) is applied to the oil inlet of the breaker (4) through the hydraulic reversing valve (2), and the breaker (4) works normally. S7. After working time T hours, the controller (7) outputs a control signal to change the oil outlet of the electromagnetic commutator, and the controller starts timing at the same time. S8. After each working time T hours, the controller (7) outputs a control signal to change the oil outlet of the electromagnetic reversing device. At the same time, the controller starts timing until the switch valve is closed. After the pressure sensor (5) can no longer collect the pressure signal, the controller (7) does not output an electrical signal to the electromagnetic reversing device to reverse the direction. The hydraulic reversing valve (2) is in the middle position and stops working. It also includes a control strategy. The controller (7) outputs a control signal to pump I (101). After receiving the control signal, pump I (101) outputs power of X% and feeds back the working time T hours to the controller (7). The controller (7) outputs a control signal to pump II (102). After receiving the control signal, pump II (102) outputs power of X% and feeds back the working time T hours to the controller (7). The controller alternately sends control signals to pump I (101) and pump II (102). The two pumps operate at X% power and feed back the working time in turn. They alternate continuously to achieve the same total output power of pump I (101) and pump II (102).

2. The control method for an excavator crushing system as described in claim 1, characterized in that: The hydraulic directional valve (2) is a three-position three-way hydraulic directional valve.

3. The control method for an excavator crushing system as described in claim 1, characterized in that: An overflow valve (3) is provided between the oil inlet end of the hydraulic breaker (4) and the oil return tank.

4. The control method for an excavator crushing system as described in claim 1, characterized in that: The switching valve is a one-way foot valve (6).

5. The excavator crushing system as described in claim 1, characterized in that: The electromagnetic reversing device is a pilot solenoid valve group (9), which includes solenoid valve I (91) and solenoid valve II (92). The input ends of solenoid valve I (91) and solenoid valve II (92) are connected to the output ends of the switching valve. The output ends of solenoid valve I (91) and solenoid valve II (92) are respectively connected to the two control ends of the hydraulic reversing valve (2). The control ends of solenoid valve I (91) and solenoid valve II (92) are connected to the controller.

6. The excavator crushing system as described in claim 5, characterized in that: The solenoid valve I (91) and solenoid valve II (92) are two-position three-way solenoid directional valves.

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