An excavator crushing system and control method

Abstract

The present application relates to the technical field of breaking control, and particularly relates to a kind of excavator breaking system and control method.The oil outlet of the first pump of the excavator breaking system is connected with the first oil path, the first branch connected with the first oil path can supply oil for breaking hammer, the second branch connected with the first oil path can supply oil for bucket rod cylinder, the oil outlet of the second pump is connected with the second oil path, the fourth branch connected with the second oil path can supply oil for breaking hammer, in actual operation process, the first branch (the flow of the first pump) and the fourth branch (the flow of the second pump) can converge to supply oil for breaking hammer;And when compound bucket rod action is needed, the second branch (the part flow of the first pump) can supply oil for bucket rod, most of the flow of the first pump and the whole flow of the second pump can still supply oil for breaking hammer, to achieve the purpose of meeting breaking flow demand.

Description

Technical Field

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

[0002] Large excavators are equipped with hydraulic breakers that require high flow rates, often necessitating a dual-pump confluence operation to meet their flow demands. In this dual-pump confluence operation, the first pump supplies oil in series with the breaker unit, while the second pump supplies oil to the breaker unit via a pressure shut-off valve when no other operation is required. When additional stick downward pressure is needed, the stick valve connected to the second pump switches position, and the second pump only supplies oil to the stick, resulting in a severely insufficient breaker flow rate. Summary of the Invention

[0003] The purpose of this invention is to provide an excavator breaking system and control method. The oil outlet of the first pump is connected to the first oil circuit. The first branch connected through the first oil circuit can supply oil to the breaker hammer. The second branch connected through the first oil circuit can supply oil to the boom cylinder. The oil outlet of the second pump is connected to the second oil circuit. The fourth branch connected through the second oil circuit can supply oil to the breaker hammer. In actual operation, the flow rate of the first branch (the flow rate of the first pump) and the flow rate of the fourth branch (the flow rate of the second pump) can be combined to supply oil to the breaker hammer. Furthermore, when compound boom action is required, the flow rate of the second branch (a portion of the flow rate diverted from the first pump) can supply oil to the boom. Most of the flow rate of the first pump and the entire flow rate of the second pump can still supply oil to the breaker hammer, thereby achieving the purpose of meeting the breaking flow rate requirements.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an excavator breaking system for controlling a breaker hammer and a boom cylinder, comprising: The main pump includes a first pump and a second pump; The main valve includes the breaker valve core, the first boom valve core, and the pressure shut-off valve; The first oil circuit is connected to the outlet of the first pump. The first oil circuit is connected in parallel to the first branch and the second branch. The first branch is connected to the inlet of the hydraulic breaker valve core, and the second branch is connected to the inlet of the first boom valve core. The hydraulic oil output by the first pump can be connected to the boom cylinder through the second branch and the first boom valve core. The second oil circuit is connected to the outlet of the second pump. The second oil circuit is connected in parallel to the third and fourth branches. The third branch is connected to the inlet of the pressure shut-off valve, and the outlet of the pressure shut-off valve is connected to the oil tank. The fourth branch is connected to the inlet of the breaker valve core. A one-way foot valve has its outlet connected to the control end of the hydraulic breaker valve core. In response to a crushing command, the one-way foot valve outputs pilot oil, and the hydraulic oil in the first branch can pass through the hydraulic breaker valve core to connect to the hydraulic breaker's inlet. The pilot valve assembly has port A3 connected to the control terminal of the pressure shut-off valve. In response to the pilot oil output by the one-way foot valve, the pilot oil is output from port A3 of the pilot valve assembly, the oil inlet of the pressure shut-off valve is cut off, and all the hydraulic oil output by the second pump flows to the oil inlet of the hydraulic breaker valve core through the fourth branch.

[0005] Optionally, it also includes: The second boom valve core has its oil inlet connected to the second oil circuit via a fifth branch; the fifth branch is located upstream of the third and fourth branches.

[0006] Optionally, when the valve core position of the second stick valve core is in the initial position, the oil inlet of the second stick valve core is closed, and all the hydraulic oil output by the second pump enters the third and fourth branches. By switching the valve core position of the second stick valve core, the third and fourth branches can be closed, and the hydraulic oil of the first oil circuit can be connected to the stick cylinder through the fifth branch and the second stick valve core.

[0007] Optionally, the second boom valve core includes a first working position and a second working position; When the second boom valve core switches from the initial position to the first working position, the hydraulic oil output by the second pump is connected to the rod chamber of the boom cylinder through the fifth branch, the oil inlet of the second boom valve core, and the first working oil port. When the second boom valve core switches from the initial position to the second working position, the hydraulic oil output by the second pump connects to the rodless chamber of the boom cylinder through the fifth branch, the oil inlet of the second boom valve core, and the second working oil port.

[0008] Optionally, ports A1 and A2 of the pilot valve assembly are respectively connected to the first control end and the second control end of the second boom valve core.

[0009] Optionally, the breaker valve core includes a first working position; When the oil inlet of the pressure shut-off valve is closed and the second boom valve core is in the initial position, the pilot oil output by the one-way foot valve acts on the control end of the breaker valve core, and the breaker valve core switches to the first working position; the hydraulic oil output by the first pump flows to the oil inlet of the breaker valve core through the first branch, and the hydraulic oil output by the second pump flows to the oil inlet of the breaker valve core through the fourth branch. The hydraulic oil from the first branch and the fourth branch merges and connects to the breaker through the oil inlet and the first working port of the breaker valve core.

[0010] Optionally, the first stick valve core includes a first working position and a second working position. In response to the stick pressing command, by switching the valve core position of the first stick valve core, the hydraulic oil output by the first pump can be connected to the stick cylinder through the second branch and the first stick valve core.

[0011] Optionally, when the first stick valve core is switched to the first working position, the hydraulic oil output by the first pump is connected to the rodless chamber of the stick cylinder through the first oil circuit, the second branch, the oil inlet of the first stick valve core, and the first working oil port; when the first stick valve core is switched to the second working position, the hydraulic oil output by the first pump is connected to the rod chamber of the stick cylinder through the first oil circuit, the second branch, the oil inlet of the first stick valve core, and the second working oil port.

[0012] Optionally, it also includes: A pressure sensor is connected between the oil outlet of the one-way foot valve and the control end of the breaker valve core.

[0013] Secondly, the present invention provides a control method for an excavator crushing system, which is based on the excavator crushing system, the control method comprising: In response to the crushing command, the one-way foot valve outputs pilot oil to act on the control end of the breaker valve core, and the hydraulic oil output by the first pump can pass through the first branch and connect to the oil inlet of the breaker through the breaker valve core. In response to the pilot oil output by the one-way foot valve, the pilot oil is output from port A3 of the pilot valve group, the oil inlet of the pressure shut-off valve is closed, and all the hydraulic oil output by the second pump flows to the oil inlet of the hydraulic breaker valve core through the fourth branch. In response to the stick downward command, the first stick valve core changes position, and the hydraulic oil output by the first pump can be diverted to the second branch and connected to the stick cylinder through the first stick valve core.

[0014] Compared to existing technologies, this invention has the following advantages: The flow rate of the first pump is split through a first branch and a second branch. The first branch supplies oil to the hydraulic breaker and controls the opening and closing of the breaker valve core via a one-way foot valve. The second branch diverts a portion of the first pump's flow rate to supply oil to the boom cylinder. The flow rates of both the first and second pumps still ensure that the flow rate requirement of the hydraulic breaker is met. Furthermore, the second pump's flow rate can supply oil to the hydraulic breaker through a fourth branch, while the third branch controls the on / off state of the fourth branch. When the inlet and outlet of the pressure shut-off valve are connected, the flow rate of the second pump flows entirely back to the oil tank via the third branch. When the one-way foot valve outputs pilot oil, the A3 port of the pilot valve assembly outputs pilot oil to the pressure shut-off valve, cutting off the inlet of the pressure shut-off valve. The flow rate of the second pump is then entirely supplied to the hydraulic breaker via the fourth branch, thus ensuring that the flow rate of the hydraulic breaker is still met even during compound boom operation. Attached Figure Description

[0015] Figure 1 This is a hydraulic structure diagram of the excavator crushing system in Example 1; Figure 2 for Figure 1 Partial hydraulic structure diagram; Figure 3 for Figure 1 Another part of the hydraulic structure diagram.

[0016] The following are the labels in the diagram: 1. Main pump; 2. Pilot valve assembly; 3. Main valve; 31. Hydraulic breaker valve core; 32. First boom valve core; 33. Second boom valve core; 34. Pressure shut-off valve; 4. Boom cylinder; 5. Hydraulic breaker; 6. Pressure sensor; 7. One-way foot valve; 8. Controller. Detailed Implementation

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0019] To make the purpose, technical solution, and advantages of this invention patent clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] Combination Figures 1-3This embodiment provides an excavator breaking system for controlling a hydraulic breaker 5 and a boom cylinder 4. It includes a main pump 1, a main valve 3, a first oil circuit, a second oil circuit, a one-way foot valve 7, and a pilot valve group 2. The main pump 1 includes a first pump 11 and a second pump 12. The main valve 3 includes a hydraulic breaker valve core 31, a first boom valve core 32, and a pressure shut-off valve 34. The first oil circuit is connected to the outlet of the first pump 11, and is connected in parallel to a first branch and a second branch. The first branch is connected to the inlet of the hydraulic breaker valve core 31, and the second branch is connected to the inlet of the first boom valve core 32. In response to a boom pressing command, the hydraulic oil output by the first pump 11 can connect to the boom cylinder 4 through the second branch and the first boom valve core 32. The second oil circuit is connected to the outlet of the second pump 12, and is connected in parallel to a third branch and a fourth branch. The third branch is connected to the inlet of the pressure shut-off valve 34, and the outlet of the pressure shut-off valve 34 is connected to the oil tank; the fourth branch is connected to the inlet of the breaker valve core 31; the outlet of the one-way foot valve 7 is connected to the pilot port XAo of the breaker assembly, and the pilot port XAo of the breaker assembly is connected to the control end of the breaker valve core 31; in response to the breaker command, the one-way foot valve 7 outputs pilot oil, and the hydraulic oil of the first branch can pass through the breaker valve core 31 to connect to the inlet of the breaker 5; the A3 port of the pilot valve group 2 is connected to the XBp1 port of the main valve 3, and the XBp1 port of the main valve 3 is the control end of the pressure shut-off valve 34; in response to the dual pump confluence command, the A3 port of the pilot valve group 2 outputs pilot oil, the inlet of the pressure shut-off valve 34 is cut off, and all the hydraulic oil output by the second pump 12 flows through the fourth branch to the inlet of the breaker valve core 31.

[0021] In this embodiment, a pressure sensor 6 is provided between the oil outlet of the one-way foot valve 7 and the control end of the hydraulic breaker valve core 31. The pressure sensor 6 transmits the collected pressure signal to the controller 8. When the pressure sensor 6 detects that the oil outlet of the one-way foot valve 7 outputs pilot oil, the controller 8 outputs a command to control the A3 port of the pilot valve group 2 to output pilot oil to act on the control end of the pressure shut-off valve 34. The pressure shut-off valve 34 switches to the right position, and the oil inlet of the pressure shut-off valve 34 is cut off, so that the hydraulic oil output by the first pump 11 can reach the oil inlet of the hydraulic breaker valve core 31 through the first oil circuit and the first branch. The hydraulic oil output by the second pump 12 can reach the oil inlet of the hydraulic breaker valve core 31 through the second oil circuit and the fourth branch. The hydraulic oil output by the first pump 11 and the second pump 12 can merge to provide flow for the hydraulic breaker 5.

[0022] If the compound boom needs to be depressed during the crushing process, in response to the boom depression command, the first boom valve 32 switches its position. The hydraulic oil output from the first pump 11 flows through the first oil circuit and the second branch to the inlet of the first boom valve 32, supplying oil to the rodless or rod chamber of the boom cylinder 4. Excluding the flow diverted by the second branch, the remaining hydraulic oil output from the first pump 11 flows through the first oil circuit and the first branch to the inlet of the breaker valve 31 to supply oil to the breaker 5. During this process, the pressure shut-off valve 34 remains in the right position, and all the hydraulic oil from the second pump 12 supplies oil to the breaker 5 through the second oil circuit and the fourth branch, thus ensuring that the flow requirements of the breaker 5 are met while the compound boom is operating.

[0023] To further specify, the crushing system also includes a second boom valve core 33, the oil inlet of which is connected to the second oil circuit via a fifth branch; the fifth branch is located upstream of the third and fourth branches. When the valve core of the second boom valve core 33 is in the initial position, the oil inlet of the second boom valve core 33 is closed, and all the hydraulic oil output by the second pump 12 enters the third and fourth branches. At this time, if the pressure shut-off valve 34 is in the left position, all the hydraulic oil output by the second pump 12 flows back to the oil tank through the third branch; if the pressure shut-off valve 34 is in the right position, all the hydraulic oil output by the second pump 12 flows to the breaker valve core 31 through the fourth branch.

[0024] In the preceding text, during the dual-pump confluence crushing and compound boom pressing, the second boom valve core 33 remains in its initial position. Furthermore, in this embodiment, the second boom valve core 33 can also operate independently to supply oil to the boom cylinder 4. By switching the valve core position of the second boom valve core 33, the third and fourth branches can be shut off, and the hydraulic oil from the first oil circuit can be connected to the boom cylinder 4 via the fifth branch and the second boom valve core 33.

[0025] Specifically, the second boom valve core 33 includes a first working position and a second working position. When the second boom valve core 33 switches from the initial position to the first working position, the hydraulic oil output by the second pump 12 connects to the rod chamber of the boom cylinder 4 through the fifth branch, the inlet of the second boom valve core 33, and the first working port. When the second boom valve core 33 switches from the initial position to the second working position, the hydraulic oil output by the second pump 12 connects to the rodless chamber of the boom cylinder 4 through the fifth branch, the inlet of the second boom valve core 33, and the second working port. During this process, the flow rate of the second pump 12 is entirely used to supply oil to the boom cylinder 4, which may result in insufficient crushing flow. In actual operation, the flow rate will be selected according to actual needs.

[0026] In addition, in this embodiment, the A1 port and A2 port of the pilot valve group 2 are respectively connected to the first control end and the second control end of the second boom valve core 33. The A1 port and A2 port of the pilot valve group 2 can output pilot oil to control the valve core position of the second boom valve core 33.

[0027] Further elaborating on the hydraulic breaker valve core 31, the hydraulic breaker valve core 31 includes a first working position. When the oil inlet of the pressure shut-off valve 34 is closed and the second boom valve core 33 is in the initial position, the one-way foot valve 7 outputs pilot oil to act on the control end of the hydraulic breaker valve core 31, and the hydraulic breaker valve core 31 switches to the first working position. The hydraulic oil output by the first pump 11 flows through the first branch to the oil inlet of the hydraulic breaker valve core 31, and the hydraulic oil output by the second pump 12 flows through the fourth branch to the oil inlet of the hydraulic breaker valve core 31. The hydraulic oil from the first branch and the fourth branch merges and connects to the hydraulic breaker 5 through the oil inlet and the first working port of the hydraulic breaker valve core 31, thereby meeting the flow requirements of the hydraulic breaker 5. If the compound boom is activated, the flow output by the first pump 11 can be partially diverted to the boom cylinder 4 through the second branch, the second boom valve core 33 remains in the initial position, and the flow output by the second pump 12 is entirely supplied to the hydraulic breaker 5.

[0028] In this embodiment, the first stick valve core 32 includes a first working position and a second working position. Switching the position of the first stick valve core 32 controls the extension and retraction of the stick cylinder 4. When the first stick valve core 32 is switched to the first working position, the hydraulic oil output by the first pump 11 connects to the rodless chamber of the stick cylinder 4 via the first oil circuit, the second branch, the inlet of the first stick valve core 32, and the first working port. When the first stick valve core 32 is switched to the second working position, the hydraulic oil output by the first pump 11 connects to the rod chamber of the stick cylinder 4 via the first oil circuit, the second branch, the inlet of the first stick valve core 32, and the second working port. The first stick valve core 32 can utilize the flow rate from the first pump 11 diverted by the second branch to perform stick movements without causing insufficient flow to the breaker hammer 5. Example 2

[0029] This embodiment provides a control method for an excavator crushing system according to Embodiment 1, which includes: In response to the crushing command, the one-way foot valve 7 outputs pilot oil to act on the control end of the breaker valve core 31, and the hydraulic oil output by the first pump 11 can pass through the first branch and connect to the oil inlet of the breaker 5 through the breaker valve core 31. In response to the pilot oil output by the one-way foot valve 7, the pilot oil is output from port A3 of the pilot valve group 2, the oil inlet of the pressure shut-off valve 34 is cut off, and all the hydraulic oil output by the second pump 12 flows to the oil inlet of the breaker valve core 31 through the fourth branch. In response to the stick downward command, the first stick valve core 32 changes position, and the hydraulic oil output by the first pump 11 can be diverted to the second branch and connected to the stick cylinder 4 through the first stick valve core 32.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A crushing system for an excavator, used to control a hydraulic breaker (5) and a boom cylinder (4), characterized in that, include: The main pump (1) includes a first pump (11) and a second pump (12); The main valve (3) includes a breaker valve core (31), a first boom valve core (32), and a pressure shut-off valve (34). The first oil circuit is connected to the outlet of the first pump (11). The first oil circuit is connected in parallel to the first branch and the second branch. The first branch is connected to the inlet of the hydraulic breaker valve core (31), and the second branch is connected to the inlet of the first boom valve core (32). The hydraulic oil output by the first pump (11) can be connected to the boom cylinder (4) through the second branch and the first boom valve core (32). The second oil circuit is connected to the outlet of the second pump (12). The second oil circuit is connected in parallel with the third branch and the fourth branch. The third branch is connected to the inlet of the pressure shut-off valve (34), and the outlet of the pressure shut-off valve (34) is connected to the oil tank. The fourth branch is connected to the inlet of the breaker valve core (31). One-way foot valve (7), the oil outlet is connected to the control end of the hydraulic breaker valve core (31); the one-way foot valve (7) outputs pilot oil, and the hydraulic oil of the first branch can pass through the hydraulic breaker valve core (31) to connect to the oil inlet of the hydraulic breaker (5); The pilot valve assembly (2) is connected to the control end of the pressure shut-off valve (34) via port A3. When the one-way foot valve (7) outputs pilot oil, the pilot valve assembly (2) outputs pilot oil via port A3, and the oil inlet of the pressure shut-off valve (34) is shut off. All the hydraulic oil output by the second pump (12) flows through the fourth branch to the oil inlet of the breaker valve core (31). The second boom valve core (33) has its oil inlet connected to the second oil circuit via a fifth branch; the fifth branch is located upstream of the third and fourth branches; When the valve core position of the second stick valve core (33) is in the initial position, the oil inlet of the second stick valve core (33) is closed, and all the hydraulic oil output by the second pump (12) enters the third branch and the fourth branch. By switching the valve core position of the second stick valve core (33), the third branch and the fourth branch can be closed, and the hydraulic oil of the first oil circuit can be connected to the stick cylinder (4) through the fifth branch and the second stick valve core (33).

2. The excavator crushing system according to claim 1, characterized in that, The second boom valve core (33) includes a first working position and a second working position; When the second boom valve core (33) switches from the initial position to the first working position, the hydraulic oil output by the second pump (12) is connected to the rod chamber of the boom cylinder (4) through the fifth branch and the oil inlet of the second boom valve core (33) and the first working oil port; When the second stick valve core (33) switches from the initial position to the second working position, the hydraulic oil output by the second pump (12) is connected to the rodless chamber of the stick cylinder (4) through the fifth branch and the oil inlet of the second stick valve core (33) and the second working oil port.

3. The excavator crushing system according to claim 2, characterized in that, The A1 port and A2 port of the pilot valve assembly (2) are respectively connected to the first control end and the second control end of the second boom valve core (33).

4. The excavator crushing system according to claim 1, characterized in that, The breaker valve core (31) includes a first working position; When the oil inlet of the pressure shut-off valve (34) is closed and the second boom valve core (33) is in the initial position, the one-way foot valve (7) outputs pilot oil to act on the control end of the breaker valve core (31), and the breaker valve core (31) switches to the first working position; the hydraulic oil output by the first pump (11) flows through the first branch to the oil inlet of the breaker valve core (31), and the hydraulic oil output by the second pump (12) flows through the fourth branch to the oil inlet of the breaker valve core (31). After the hydraulic oil of the first branch and the fourth branch merges, it connects to the breaker (5) through the oil inlet and the first working oil port of the breaker valve core (31).

5. The excavator crushing system according to claim 1, characterized in that, The first stick valve core (32) includes a first working position and a second working position. In response to the stick pressing command, by switching the valve core position of the first stick valve core (32), the hydraulic oil output by the first pump (11) can be connected to the stick cylinder (4) through the second branch and the first stick valve core (32).

6. The excavator crushing system according to claim 5, characterized in that, When the first boom valve core (32) is switched to the first working position, the hydraulic oil output by the first pump (11) is connected to the rodless chamber of the boom cylinder (4) through the first oil circuit, the second branch circuit, the oil inlet of the first boom valve core (32), and the first working oil port. When the first boom valve core (32) switches to the second working position, the hydraulic oil output by the first pump (11) is connected to the rod chamber of the boom cylinder (4) through the first oil circuit, the second branch circuit, the oil inlet of the first boom valve core (32), and the second working oil port.

7. The excavator crushing system according to claim 1, characterized in that, Also includes: A pressure sensor (6) is connected between the oil outlet of the one-way foot valve (7) and the control end of the breaker valve core (31).

8. A control method for an excavator crushing system, characterized in that, Based on the excavator crushing system according to any one of claims 1-7, the control method includes: In response to the crushing command, the one-way foot valve (7) outputs pilot oil to act on the control end of the breaker valve core (31), and the hydraulic oil output by the first pump (11) can pass through the first branch and connect to the oil inlet of the breaker (5) through the breaker valve core (31). In response to the pilot oil output by the one-way foot valve (7), the pilot oil is output from port A3 of the pilot valve group (2), the oil inlet of the pressure shut-off valve (34) is shut off, and all the hydraulic oil output by the second pump (12) flows to the oil inlet of the breaker valve core (31) through the fourth branch. In response to the stick downward command, the first stick valve core (32) is switched, and the hydraulic oil output by the first pump (11) can be diverted to the second branch and connected to the stick cylinder (4) through the first stick valve core (32).

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