A high-low pressure switching device and a concrete pumping apparatus having the same

Abstract

The application relates to a high-low pressure switching device and a concrete pumping equipment with the same. The high-low pressure switching device comprises a first oil inlet, a second oil inlet, a first system oil outlet, a second system oil outlet, a third system oil outlet, a fourth system oil outlet, a first electro-hydraulic reversing valve, a second electro-hydraulic reversing valve, a shuttle valve, an electromagnetic reversing valve, a first superimposed hydraulic control check valve and a second superimposed hydraulic control check valve. The concrete pumping equipment comprises an oil tank, a pump group and an actuator, and further comprises an accumulator and the high-low pressure switching device. The high-low pressure switching device adopts two electro-hydraulic reversing valves in a plate type mounting mode to be responsible for high-pressure pumping and low-pressure pumping respectively, and two hydraulic control check valves are arranged in the closed loop of the rod cavity and the rodless cavity of the main oil cylinder to cooperate with the electro-hydraulic reversing valves for control, so that the hydraulic system control logic is simple.

Description

Technical Field

[0001] This invention relates to a high-low pressure switching device and a concrete pumping equipment having the same, belonging to the field of high-low pressure switching technology for hydraulic cylinders. Background Technology

[0002] A concrete pump is a type of concrete machinery that uses hydraulic pressure to continuously transport concrete through pipelines. Its basic principle is that a prime mover drives a hydraulic pump to generate pressurized oil, which in turn drives a hydraulic cylinder. The piston rod of the hydraulic cylinder drives the piston in the concrete cylinder, pushing the concrete into the delivery pipeline. Through the coordinated actions of the concrete distribution valve and the main hydraulic cylinder, concrete is continuously drawn from the concrete hopper into the concrete cylinder and transported to the pouring location via the pipeline. To adapt to different working conditions, the pumping method needs to be switched between high and low pressure during the pumping process to ensure efficient operation of the equipment. When the pressurized oil generated by the pump enters the rodless chamber of the hydraulic cylinder, the force generated by the cylinder is greater, which is called high-pressure pumping; when the pressurized oil generated by the pump enters the rod chamber of the hydraulic cylinder, the force generated is smaller, which is called low-pressure pumping.

[0003] Traditional high-low pressure switching systems require six two-way cartridge valves to operate in sequence to complete the high-low pressure switching. If a two-way cartridge valve malfunctions after long-term use, such as failing to open or close properly, it will cause the hydraulic cylinders to become connected, making it impossible to accurately determine which valve is faulty. Moreover, the valve core and valve sleeve require special tools to disassemble and replace, which requires maintenance personnel to have a high level of hydraulic knowledge, and general equipment operators cannot perform the maintenance. Secondly, the two-way cartridge valve mounting hole requires high machining precision, and its inner hole surface roughness requires fine boring, which makes the valve block machining time-consuming and costly. Summary of the Invention

[0004] The purpose of this invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0005] The present invention provides a high-low pressure switching device, including a first oil supply port, a second oil supply port, a first system oil outlet, a second system oil outlet, a third system oil outlet, a fourth system oil outlet, a first electro-hydraulic directional valve, a second electro-hydraulic directional valve, a shuttle valve, a solenoid directional valve, a first stacked hydraulic control check valve and a second stacked hydraulic control check valve.

[0006] The first oil supply port is connected to the main valve body of the first electro-hydraulic directional valve, the main valve body of the second electro-hydraulic directional valve, and the oil inlet of the shuttle valve. The working oil port of the first electro-hydraulic directional valve is connected to the oil inlet of the first stacked hydraulic control check valve, the oil outlet of the first system, and the oil outlet of the second system, respectively. The oil outlet of the second electro-hydraulic directional valve is connected to the oil inlet of the second stacked hydraulic control check valve, the oil outlet of the third system, and the oil outlet of the fourth system, respectively.

[0007] The second oil supply port is connected to the oil inlet of the shuttle valve, the pilot solenoid valve of the first electro-hydraulic directional valve, and the pilot solenoid valve of the second electro-hydraulic directional valve. The oil outlet of the shuttle valve is connected to the oil inlet of the solenoid directional valve. The working oil port of the solenoid directional valve is connected to the control port of the first stacked hydraulic control check valve and the control port of the second stacked hydraulic control check valve, respectively.

[0008] The oil outlets of the first electro-hydraulic directional valve, the second electro-hydraulic directional valve, and the solenoid directional valve are connected to the oil tank.

[0009] Furthermore, the first electro-hydraulic directional valve, the second electro-hydraulic directional valve, the shuttle valve, the solenoid directional valve, the first stacked hydraulic control check valve, and the second stacked hydraulic control check valve are integrated on an integrated block.

[0010] This invention also discloses a concrete pumping device, including an oil tank, a pump set, and an actuator, further including an accumulator and a high-low pressure switching device as described above. The pump set is connected to the oil tank via an oil circuit. The pump set includes a prime mover and a constant-power plunger pump and a constant-pressure pump driven by the prime mover. The actuator includes a first main cylinder and a second main cylinder. The oil outlet of the constant-power plunger pump is connected to the first oil supply port, and the rodless chambers of the first and second main cylinders are respectively connected to the oil outlet of the first system. The first main cylinder and the second main cylinder are connected to the oil outlet of the second system. The rod chambers of the first main cylinder and the second main cylinder are connected to the oil outlet of the third system and the oil outlet of the fourth system, respectively. The oil outlet of the constant pressure pump is connected to the second oil supply port and the oil inlet of the accumulator. Hydraulic oil is supplied to the accumulator for filling and maintaining pressure through the outlet of the constant pressure pump. The hydraulic oil in the accumulator is supplied to the oil inlet of the solenoid directional valve through the shuttle valve. The hydraulic oil in the accumulator is also supplied to the oil inlets of the pilot solenoid valves of the first electro-hydraulic directional valve and the pilot solenoid valves of the second electro-hydraulic directional valve.

[0011] Furthermore, the oil outlet of the constant power plunger pump is connected to the first oil supply port through an electromagnetic relief valve, the oil inlet of the electromagnetic relief valve is connected to the oil outlet of the constant power plunger pump, and the oil outlet of the electromagnetic relief valve is connected to the oil tank; the oil outlet of the constant pressure pump is connected to the second oil supply port through a check valve and a pilot-operated relief valve in sequence, the oil inlet of the pilot-operated relief valve is connected to the oil outlet of the constant pressure pump, and the oil outlet of the pilot-operated relief valve is connected to the oil tank.

[0012] Furthermore, it also includes a first pressure gauge and a second pressure gauge, which are respectively connected to the oil outlets of the constant power plunger pump and the constant pressure pump.

[0013] Furthermore, it also includes a third electro-hydraulic directional valve and a swing valve cylinder. The second oil supply port is connected to the oil inlet of the third electro-hydraulic directional valve, the working oil port of the third electro-hydraulic directional valve is connected to the swing valve cylinder, and the oil outlet of the third electro-hydraulic directional valve is connected to the oil tank.

[0014] Furthermore, it also includes a controller, which is electrically connected to the solenoid directional valve, the first electro-hydraulic directional valve, the second electro-hydraulic directional valve and the third electro-hydraulic directional valve.

[0015] Furthermore, it also includes a level gauge and an air filter, both of which are mounted on the oil tank.

[0016] Furthermore, it also includes a first oil suction filter and a second oil suction filter. The oil inlet of the first oil suction filter is connected to the oil tank, and the oil outlet of the first oil suction filter is connected to the inlet of the constant power plunger pump. The oil inlet of the second oil suction filter is connected to the oil tank, and the oil outlet of the second oil suction filter is connected to the inlet of the constant pressure pump.

[0017] Furthermore, limit switches are also provided in the extension direction of the push rods of the first and second main hydraulic cylinders.

[0018] The beneficial effects of this invention are:

[0019] 1. The high-low pressure switching device of the present invention uses two plate-mounted electro-hydraulic directional valves to be responsible for high-pressure pumping and low-pressure pumping respectively. In addition, two hydraulically controlled check valves are used in the rod chamber and rodless chamber closed circuit of the main cylinder to cooperate with the electro-hydraulic directional valves for control. The hydraulic system control logic is simple and the valve block is easy to process, so maintenance is convenient, troubleshooting is faster, and user maintenance costs are reduced.

[0020] 2. The oil outlet of the constant pressure pump of the present invention is also connected to the swing valve cylinder, realizing the orderly reversing docking and conveying cooperation between the swing valve cylinder and the main cylinder, so that concrete is continuously sucked from the concrete hopper into the concrete cylinder and transported to the pouring location through the conveying pipeline, resulting in a compact structure.

[0021] 3. This invention uses a plate-mounted valve to replace a two-way cartridge valve. The base plate of the plate-mounted valve is simpler to process than that of the two-way cartridge valve. The processing time of the plate-mounted valve base plate is short, the structure is compact, and the processing cost is low. When the plate-mounted valve fails, the replacement time is short, which ensures the progress of equipment construction. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic control principle of the high-low pressure switching device according to a specific embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the hydraulic control principle of a concrete pumping device according to a specific embodiment two of the present invention;

[0024] In the diagram, 1. Oil tank; 2. Prime mover; 3. Constant power piston pump; 4. Constant pressure pump; 5. Solenoid relief valve; 6. First pressure gauge; 7. Second pressure gauge; 8. Pilot-operated relief valve; 9. Check valve; 10. Accumulator; 12. First electro-hydraulic directional valve; 13. Second electro-hydraulic directional valve; 14. Shuttle valve; 15. Solenoid directional valve; 16. First stacked hydraulic control check valve; 17. Second stacked hydraulic control check valve; 18.1. First main cylinder; 8.2 Second main cylinder; 19. Swing valve cylinder; 19.1 First swing valve cylinder; 19.2 Second swing valve cylinder; 20. Third electro-hydraulic directional valve; 21. First suction oil filter; 22. Second suction oil filter; 23. Level gauge; 24. Air filter; 25. First system oil outlet; 26. Second system oil outlet; 27. Third system oil outlet; 28. Fourth system oil outlet; 29. ​​First oil supply port; 30. Second oil supply port. Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Specific Implementation Example 1:

[0027] As shown in the figure, in the first embodiment, the present invention discloses a high-low pressure switching device, including a first oil supply port 29, a second oil supply port 30, a first system oil outlet 25, a second system oil outlet 26, a third system oil outlet 27, a fourth system oil outlet 28, a first electro-hydraulic directional valve 12, a second electro-hydraulic directional valve 13, a shuttle valve 14, a solenoid directional valve 15, a first stacked hydraulic control check valve 16, and a second stacked hydraulic control check valve 17. The first oil supply port 29 is connected to the main valve body of the first electro-hydraulic directional valve 12, the main valve body of the second electro-hydraulic directional valve 13, and the oil inlet of the shuttle valve 14. The working oil port of the first electro-hydraulic directional valve 12 is connected to the oil inlet of the first stacked hydraulic control check valve 16, the first... The system oil outlet 25 and the second system oil outlet 26 are connected to the oil outlet of the second electro-hydraulic directional valve 13, which is connected to the oil inlet of the second stacked hydraulic control check valve 17, the oil outlet of the third system 27, and the oil outlet of the fourth system 28, respectively. The second oil supply port 30 is connected to the oil inlet of the shuttle valve 14, the pilot solenoid valve of the first electro-hydraulic directional valve 12, and the pilot solenoid valve of the second electro-hydraulic directional valve 13. The oil outlet of the shuttle valve 14 is connected to the oil inlet of the solenoid directional valve 15. The working oil port of the solenoid directional valve 15 is connected to the control port of the first stacked hydraulic control check valve 16 and the second stacked hydraulic control check valve 17, respectively. The oil outlets of the first electro-hydraulic directional valve 12, the second electro-hydraulic directional valve 13, and the solenoid directional valve 15 are connected to the oil tank 1.

[0028] Specifically, the first electro-hydraulic directional valve 12 is responsible for high-pressure pumping. During high-pressure pumping, when the solenoid DT4 of the pilot solenoid valve of the first electro-hydraulic directional valve 12 is energized, hydraulic oil enters the second system outlet 26 from the first oil supply port 29 through the right side of the main valve body of the first electro-hydraulic directional valve 12. At the same time, the pressure oil from the outlet of the shuttle valve 14 enters the control port of the second superimposed hydraulic control check valve 17 through the right working position of the solenoid directional valve 15 and opens it. When the solenoid DT5 of the pilot solenoid valve of the first electro-hydraulic directional valve 12 is energized, hydraulic oil enters the first system outlet 25 from the first oil supply port 29 through the left side of the main valve body of the first electro-hydraulic directional valve 12. At the same time, the pressure oil from the outlet of the shuttle valve 14 enters the control port of the second superimposed hydraulic control check valve 17 through the right working position of the solenoid directional valve 15 and opens it.

[0029] The second electro-hydraulic directional valve 13 is responsible for low-pressure pumping. During low-pressure pumping, when the solenoid DT2 of the pilot solenoid valve of the second electro-hydraulic directional valve 13 is energized, the solenoid DT1 of the solenoid directional valve 15 is also energized. Hydraulic oil enters the fourth system outlet 28 from the first oil supply port 29 through the right side of the main valve body of the second electro-hydraulic directional valve 13. At the same time, the pressure oil from the outlet of the shuttle valve 14 enters the control port of the first stacked hydraulic control check valve 16 through the left working position of the solenoid directional valve 15 and opens it. When the solenoid DT3 of the pilot solenoid valve of the second electro-hydraulic directional valve 13 is energized, the solenoid DT1 of the solenoid directional valve 15 is also energized. Hydraulic oil enters the third system outlet 27 from the first oil supply port 29 through the left side of the main valve body of the second electro-hydraulic directional valve 13. At the same time, the pressure oil from the outlet of the shuttle valve 14 enters the control port of the first stacked hydraulic control check valve 16 through the left working position of the solenoid directional valve 15 and opens it.

[0030] The first electro-hydraulic directional valve 12, the second electro-hydraulic directional valve 13, the shuttle valve 14, the solenoid directional valve 15, the first stacked hydraulic control check valve 16, and the second stacked hydraulic control check valve 17 are integrated on an integrated block.

[0031] The high-low pressure switching device of the present invention uses two electro-hydraulic directional valves to be responsible for high-pressure pumping and low-pressure pumping respectively, and uses two hydraulically controlled check valves to cooperate with the electro-hydraulic directional valves for control. The valve block is simple to process, the hydraulic system control logic is simple, maintenance is convenient, troubleshooting is faster, and the user's maintenance cost is lower. Specific Implementation Example 2:

[0033] In the second embodiment, the present invention discloses a concrete pumping device, including an oil tank 1, a pump set, and an actuator, and further including an accumulator 10 and a high-low pressure switching device as described in the first embodiment. The pump set is connected to the oil tank 1 via an oil circuit. The pump set includes a prime mover 2 and a constant power plunger pump 3 and a constant pressure pump 4 driven by the prime mover 2. The actuator includes a first main cylinder 18.1 and a second main cylinder 18.2. The oil outlet of the constant power plunger pump 3 is connected to the first oil supply port 29, and the rodless chambers of the first main cylinder 18.1 and the second main cylinder 18.2 are respectively connected to the first system outlet. Oil port 25 is connected to the second system oil outlet 26. The rod chambers of the first main cylinder 18.1 and the second main cylinder 18.2 are respectively connected to the third system oil outlet 27 and the fourth system oil outlet 28. The oil outlet of the constant pressure pump 4 is connected to the second oil supply port 30 and the oil inlet of the accumulator 10. Hydraulic oil is supplied to the accumulator 10 for filling and pressure maintenance through the outlet of the constant pressure pump 4. The hydraulic oil in the accumulator 10 is supplied to the oil inlet of the solenoid directional valve 15 through the shuttle valve 14. The hydraulic oil in the accumulator 10 is also supplied to the oil inlets of the pilot solenoid valves of the first electro-hydraulic directional valve 12 and the second electro-hydraulic directional valve 13.

[0034] Specifically, the mechanism connected to the oil tank 1 further includes a level gauge 23, an air filter 24, an oil suction filter 21, and a second oil suction filter 22. The actuator also includes a swing valve cylinder 19, which includes a first swing valve cylinder 19.1 and a second swing valve cylinder 19.2. The concrete pumping equipment also includes an electromagnetic overflow valve 5, a pilot-operated overflow valve 8, a first pressure gauge 6, a second pressure gauge 7, a first electro-hydraulic directional valve 12, a second electro-hydraulic directional valve 13, and a third pressure gauge 14, all integrated on an integrated block. In this embodiment, the outlet of the constant power plunger pump 3 is connected to the solenoid relief valve 5, the main valve body of the first electro-hydraulic directional valve 12, the main valve body of the second electro-hydraulic directional valve 13, and the inlet of the shuttle valve 14. The working port of the first electro-hydraulic directional valve 12 is connected to the inlet of the first stacked hydraulic control check valve 16, the rodless chamber of the first main cylinder 18.1, and the rodless chamber of the second main cylinder 18.2. The outlet of the second electro-hydraulic directional valve 13 is connected to the inlet of the second stacked hydraulic control check valve 17 and the first main cylinder 18.2. The rod chamber of cylinder 18.1 and the rod chamber of the second main cylinder 18.2 are connected to the oil outlet of the constant pressure pump 4, which is connected to the oil inlet of the following valves: check valve 9, pilot-operated relief valve 8, accumulator 10, adjustable flow valve 11, shuttle valve 14, pilot solenoid valve of electro-hydraulic directional valve 12, pilot solenoid valve of electro-hydraulic directional valve 13, solenoid directional valve 15, and electro-hydraulic directional valve 20. The working oil port of electro-hydraulic directional valve 20 is connected to the first swing valve cylinder 19.1 and the second swing valve cylinder 19.2. The oil outlet of shuttle valve 14 is connected to the solenoid directional valve. The oil inlet of 15 and the working oil port of the solenoid directional valve 15 are respectively connected to the control ports of the first stacked hydraulic control check valve 16 and the second stacked hydraulic control check valve 17. The oil outlet of the solenoid relief valve 5, the pilot relief valve 8, the adjustable flow valve 11, the first electro-hydraulic directional valve 12, the second electro-hydraulic directional valve 13, the third electro-hydraulic directional valve 20, and the solenoid directional valve 15 are connected to the oil tank 1. The PLC output signal in the controller controls the electromagnets DT1, DT2, DT3, DT4, DT5, DT6, DT7, and DT8.

[0035] The working principle of the high-low pressure switching of the concrete pumping equipment of the present invention is as follows:

[0036] (1) When the prime mover 2 starts, it drives the constant power plunger pump 3 and the constant pressure pump 4 to work. The suction ports of the constant power plunger pump 3 and the constant pressure pump 4 draw oil from the oil tank 1 through the first suction oil filter 21 and the second suction oil filter 22, respectively. The hydraulic oil returns to the oil tank 1 from the oil outlet of the constant power plunger pump 3 through the electromagnetic overflow valve 5. The main cylinder system is in an unloaded state. At the same time, the hydraulic oil is supplied to the accumulator 10 for filling and pressure maintenance through the oil outlet of the constant pressure pump 4 and is supplied to the oil inlet of the electromagnetic reversing valve 15 through the shuttle valve 14.

[0037] (2) During high-pressure pumping, the PLC output signal of the controller is sent to DT4, DT6, and DT8. The pressure oil of the accumulator 10 enters the spring chamber on the right side of the main valve body through the pilot solenoid valve DT4 side of the first electro-hydraulic directional valve 12, pushing the right side of the main valve body of the first electro-hydraulic directional valve 12 into the working position. The hydraulic oil from the outlet of the constant power plunger pump 3 enters the rodless chamber of the second main cylinder 18.2 through the solenoid relief valve 5 and the right side of the main valve body of the first electro-hydraulic directional valve 12. At the same time, the pressure oil from the outlet of the shuttle valve 14 enters the control port of the second superimposed hydraulic control check valve 17 through the right working position of the solenoid directional valve 15 and opens it. The rod chamber of the first main cylinder 18.1 is connected through the second superimposed hydraulic control check valve 17 to form a closed oil circuit. Hydraulic oil from the rod chamber of the second main cylinder 18.2 enters the rod chamber of the first main cylinder 18.1 through a closed oil circuit and pushes it backward. Hydraulic oil from the rodless chamber of the first main cylinder 18.1 returns to the oil tank 1 through the outlet of the first electro-hydraulic directional valve 12. At the same time, the pressure oil from the accumulator 10 enters the spring chamber on the right side of the main valve body of the third electro-hydraulic directional valve 20 through the pilot solenoid valve DT6 side, pushing the right side of the main valve body of the third electro-hydraulic directional valve 20 into the working position. Hydraulic oil enters the rodless chamber of the second swing valve cylinder 19.2 through the outlet of the constant pressure pump 4, the check valve 9, the accumulator 10, and the right side of the main valve body of the third electro-hydraulic directional valve 20. The second swing valve cylinder 19.2 extends rapidly and pushes the first swing valve cylinder 19.1 back.

[0038] The push rods of the first main cylinder 18.1 and the second main cylinder 18.2 are also equipped with limit switches in the extension direction. When the second main cylinder 18.2 extends to the position and triggers the limit switch, the limit switch sends a reversing signal to the controller PLC. The PLC simultaneously outputs a reversing signal to the electromagnets DT5 and DT7. The first main cylinder 18.1, the second main cylinder 18.2, the first swing valve cylinder 19.1 and the second swing valve cylinder 19.2 will then enter the next working cycle, and so on, forming high-pressure pumping.

[0039] (3) When the low-pressure pump is in operation, the PLC output signal of the controller is sent to DT1, DT2, DT6, and DT8. The pressure oil of the accumulator 10 enters the spring chamber on the right side of the main valve body of the second electro-hydraulic directional valve 13 through the pilot solenoid valve DT2 side, pushing the right side of the main valve body of the second electro-hydraulic directional valve 13 into the working position. The hydraulic oil from the outlet of the constant power plunger pump 3 enters the rod chamber of the first main cylinder 18.1 through the solenoid relief valve 5 and the right side of the main valve body of the second electro-hydraulic directional valve 13. At the same time, the pressure oil from the outlet of the shuttle valve 14 enters the control port of the first stacked hydraulic control check valve 16 through the working position on the left side of the solenoid directional valve 15 and opens it. The rodless chamber of the second main cylinder 18.2 is connected to form a closed oil circuit through the first stacked hydraulic control check valve 16. The hydraulic oil in the rodless chamber of the first main cylinder 18.1 enters the rodless chamber of the second main cylinder 18.2 through the closed oil circuit and pushes the main cylinder out. The rod chamber of the second main cylinder 18.2... Hydraulic oil returns to tank 1 through the outlet of the second electro-hydraulic directional valve 13. Simultaneously, the pressure oil from accumulator 10 enters the right spring chamber of the main valve body of the third electro-hydraulic directional valve 20 through the pilot solenoid valve DT6 side, pushing the right side of the main valve body of the third electro-hydraulic directional valve 20 into the working position. Hydraulic oil then enters the rodless chamber of the second swing valve cylinder 19.2 through the outlet of the constant pressure pump 4, the check valve 9, the accumulator 10, and the right side of the main valve body of the third electro-hydraulic directional valve 20. The second swing valve cylinder 19.2 extends rapidly, simultaneously pushing the first swing valve cylinder 19.1 back. When the second main cylinder 18.2 extends to its position and triggers the limit switch, the limit switch sends a reversing signal to the controller PLC. The PLC simultaneously outputs a reversing signal to the electromagnets DT3 and DT7. The first main cylinder 18.1, the second main cylinder 18.2, the first swing valve cylinder 19.1, and the second swing valve cylinder 19.2 will then enter the next working cycle, repeating this process to form a low-pressure pumping cycle.

[0040] In addition, in specific embodiments one and two, the first electro-hydraulic directional valve 12, the second electro-hydraulic directional valve 13, and the third electro-hydraulic directional valve 20 are all three-position four-way electro-hydraulic directional valves, the electromagnetic directional valve 15 is a two-position four-way directional valve or a three-position four-way directional valve, the shuttle valve 14 is an OR gate type shuttle valve, and the pilot solenoid valve of the electromagnetic relief valve 5 is a two-position four-way valve.

[0041] The high-low pressure switching device of this invention employs two plate-mounted electro-hydraulic directional valves to handle high-pressure pumping and low-pressure pumping respectively. Furthermore, two hydraulically controlled check valves are used in conjunction with the electro-hydraulic directional valves to control the closed circuits of the rod-side and rodless-side chambers of the main cylinder. The hydraulic system control logic is simple, using plate-mounted valves instead of two-way cartridge valves, and the valve blocks are easy to manufacture, thus facilitating maintenance, faster troubleshooting, and reducing user maintenance costs. Additionally, the outlet of the constant pressure pump of this invention is connected to the swing valve cylinder, enabling orderly switching and conveying between the swing valve cylinder and the main cylinder. This allows concrete to be continuously drawn from the concrete hopper into the concrete cylinder and transported to the pouring location via the conveying pipeline, resulting in a compact structure.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete pumping device, comprising an oil tank (1), a pump unit, and an actuator, characterized in that, It also includes an energy storage device (10) and a high-low voltage switching device. The high-low pressure switching device includes a first oil supply port (29), a second oil supply port (30), a first system oil outlet (25), a second system oil outlet (26), a third system oil outlet (27), a fourth system oil outlet (28), a first electro-hydraulic directional valve (12), a second electro-hydraulic directional valve (13), a shuttle valve (14), a solenoid directional valve (15), a first stacked hydraulic control check valve (16), and a second stacked hydraulic control check valve (17). The first oil supply port (29) is connected to the main valve body of the first electro-hydraulic directional valve (12), the main valve body of the second electro-hydraulic directional valve (13), and the oil inlet of the shuttle valve (14). The working oil port of the first electro-hydraulic directional valve (12) is connected to the oil inlet of the first stacked hydraulic control check valve (16), the oil outlet of the first system (25), and the oil outlet of the second system (26), respectively. The oil outlet of the second electro-hydraulic directional valve (13) is connected to the oil inlet of the second stacked hydraulic control check valve (17), the oil outlet of the third system (27), and the oil outlet of the fourth system (28), respectively. The second oil supply port (30) is connected to the oil inlet of the shuttle valve (14), the pilot solenoid valve of the first electro-hydraulic directional valve (12), and the pilot solenoid valve of the second electro-hydraulic directional valve (13). The oil outlet of the shuttle valve (14) is connected to the oil inlet of the solenoid directional valve (15). The working oil port of the solenoid directional valve (15) is connected to the control ports of the first stacked hydraulic control check valve (16) and the second stacked hydraulic control check valve (17), respectively. The oil outlets of the first electro-hydraulic directional valve (12), the second electro-hydraulic directional valve (13), and the solenoid directional valve (15) are connected to the oil tank (1); The pump set is connected to the oil tank (1) via an oil circuit. The pump set includes a prime mover (2) and a constant power plunger pump (3) and a constant pressure pump (4) driven by the prime mover (2). The actuator includes a first main cylinder (18.1) and a second main cylinder (18.2). The oil outlet of the constant power plunger pump (3) is connected to the first oil supply port (29). The rodless chambers of the first main cylinder (18.1) and the second main cylinder (18.2) are respectively connected to the first system oil outlet (25) and the second system oil outlet (26). The rod chamber of 18.2) is connected to the oil outlet of the third system (27) and the oil outlet of the fourth system (28) respectively; the oil outlet of the constant pressure pump (4) is connected to the second oil supply port (30) and the oil inlet of the accumulator (10). The hydraulic oil is supplied to the accumulator (10) for filling and maintaining pressure through the outlet of the constant pressure pump (4). The hydraulic oil in the accumulator (10) is supplied to the oil inlet of the solenoid directional valve (15) through the shuttle valve (14). The hydraulic oil in the accumulator (10) is also supplied to the oil inlet of the pilot solenoid valve of the first electro-hydraulic directional valve (12) and the pilot solenoid valve of the second electro-hydraulic directional valve (13). It also includes a first pressure gauge (6) and a second pressure gauge (7), which are respectively connected to the oil outlets of the constant power plunger pump (3) and the constant pressure pump (4). The push rods of the first main cylinder (18.1) and the second main cylinder (18.2) are also equipped with limit switches in the extension direction.

2. The concrete pumping equipment according to claim 1, characterized in that, The oil outlet of the constant power plunger pump (3) is connected to the first oil supply port (29) through the electromagnetic overflow valve (5). The oil inlet of the electromagnetic overflow valve (5) is connected to the oil outlet of the constant power plunger pump (3). The oil outlet of the electromagnetic overflow valve (5) is connected to the oil tank (1). The oil outlet of the constant pressure pump (4) is connected to the second oil supply port (30) through the check valve (9) and the pilot overflow valve (8) in sequence. The oil inlet of the pilot overflow valve (8) is connected to the oil outlet of the constant pressure pump (4). The oil outlet of the pilot overflow valve (8) is connected to the oil tank (1).

3. The concrete pumping equipment according to claim 1, characterized in that, It also includes a third electro-hydraulic directional valve (20) and a swing valve cylinder (19). The second oil supply port (30) is connected to the oil inlet of the third electro-hydraulic directional valve (20). The working oil port of the third electro-hydraulic directional valve (20) is connected to the swing valve cylinder (19). The oil outlet of the third electro-hydraulic directional valve (20) is connected to the oil tank (1).

4. The concrete pumping equipment according to claim 3, characterized in that, It also includes a controller, which is electrically connected to the electromagnetic directional valve (15), the first electro-hydraulic directional valve (12), the second electro-hydraulic directional valve (13) and the third electro-hydraulic directional valve (20).

5. The concrete pumping equipment according to claim 1, characterized in that, It also includes a level gauge (23) and an air filter (24), both of which are mounted on the oil tank (1).

6. The concrete pumping equipment according to claim 1, characterized in that, It also includes a first suction oil filter (21) and a second suction oil filter (22). The oil inlet of the first suction oil filter (21) is connected to the oil tank (1), the oil outlet of the first suction oil filter (21) is connected to the inlet of the constant power plunger pump (3), the oil inlet of the second suction oil filter (22) is connected to the oil tank (1), and the oil outlet of the second suction oil filter (22) is connected to the inlet of the constant pressure pump (4).

7. The concrete pumping equipment according to claim 1, characterized in that, The first electro-hydraulic directional valve (12), the second electro-hydraulic directional valve (13), the shuttle valve (14), the solenoid directional valve (15), the first stacked hydraulic control check valve (16), and the second stacked hydraulic control check valve (17) are integrated on an integrated block.

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