Variable-frequency variable-impact-energy hydraulic breaking hammer energy storage and pressurization system

Abstract

The invention discloses a variable-frequency variable-impact-energy hydraulic breaking hammer energy storage pressurization system, which relates to the technical field of hydraulic breaking hammers and comprises a first hydraulic pump, a first overflow valve, a controller, an operation button, an original valve group, a breaking hammer, an electromagnetic directional valve, a throttling energy storage loop and an external energy accumulator group, the second energy accumulator, the first one-way valve, the second one-way valve and the first proportional pressure reducing valve form a throttling energy storage loop; a second hydraulic reversing valve, a third energy accumulator, a third one-way valve, a second proportional pressure reducing valve, a second hydraulic pump and a second overflow valve form an external energy accumulator group; compared with the prior art, the throttling energy storage loop is additionally arranged, energy storage is achieved, and the impact energy of the breaking hammer is improved; the proportional pressure reducing valve controls the loop oil pressure through the controller, and frequency conversion and speed regulation of the breaking hammer are achieved; and under the condition of high load, the oil pressure of the energy accumulator at the top of the piston is compensated again through an external energy accumulator group, so that variable impact energy and high-power density output of the breaking hammer are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic breakers, and particularly to a hydraulic breaker energy storage and boosting system with variable frequency and variable impact work. Background Art

[0002] With the wide application of hydraulic excavators in engineering fields such as construction, mining, and municipal engineering, the performance requirements for their attachments are also increasing day by day. In the current construction scenarios, hydraulic excavators often need to face various complex working conditions. For example, when performing operations such as hard rock excavation and heavy load handling, there are high requirements for the impact force and pressure of the attachments.

[0003] However, the existing hydraulic excavator attachment systems generally have the problem of low energy utilization rate. During the conventional operation process, a large amount of energy is lost in the hydraulic circuit in the form of heat energy, etc., and cannot be effectively recovered and reused. This not only increases the energy consumption of the equipment but also reduces the working efficiency. Moreover, when encountering working conditions that require instantaneous high-pressure output, such as breaking hard rocks, the traditional system often fails to provide sufficient pressure, resulting in difficult operations or even inability to complete the work. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a hydraulic breaker energy storage and boosting system with variable frequency and variable impact work, including a first overflow valve (1), a first hydraulic pump (2), an operation button (3), a controller (4), an original valve group (5), a breaker (6), an electromagnetic directional valve (7), a throttle energy storage circuit (8), and an external accumulator group (9); a working oil port A is provided at the upper chamber of the piston of the breaker (6), a working oil port B is provided below the working oil port A, a working oil port D is provided at the lower chamber of the piston of the breaker (6), a working oil port C is provided above the working oil port D, and a working oil port E is provided on the accumulator at the top of the breaker (6); The first overflow valve (1) is connected in parallel with the first hydraulic pump (2) and is simultaneously connected to the oil inlet P of the original valve group (5); the original valve group (5) is connected to the breaker (6), and the oil return port T of the original valve group (5) is connected to the throttle energy storage circuit (8) through the electromagnetic directional valve (7); the throttle energy storage circuit (8) is connected to the breaker (6); the external accumulator group (9) is connected to the breaker (6) through the throttle energy storage circuit (8); The throttle energy storage circuit (8) includes a first proportional pressure reducing valve (801), a first check valve (802), a second accumulator (803), and a second check valve (804); the oil inlet of the first proportional pressure reducing valve (801) is connected to the electromagnetic directional valve (7), and the oil outlet is connected to the second accumulator (803) through the first check valve (802); the second accumulator (803) is connected to the working oil port E of the breaker (6) through the second check valve (804); The external energy storage group (9) includes a second hydraulic directional control valve (901), a third accumulator (902), a third check valve (903), a second proportional pressure reducing valve (904), a second hydraulic pump (906) and a second relief valve (905), and the second hydraulic directional control valve (901) commutes synchronously with the original valve group (5); the second hydraulic pump (906) and the second relief valve (905) are connected in parallel and are connected to the inlet port of the second proportional pressure reducing valve (904); the outlet port of the second proportional pressure reducing valve (904) is connected to the third accumulator (902) through the third check valve (903); the third accumulator (902) is connected to the second accumulator (803) through the second hydraulic directional control valve (901).

[0005] The further limited technical solution of the present invention is: Further, the original valve group (5) includes a first hydraulic directional control valve (501) and a first accumulator (502); the inlet port P of the original valve group (5) is connected to the downward pilot end of the first hydraulic directional control valve (501); the first accumulator (502) of the original valve group (5) is respectively connected to the inlet port P and the working oil port D of the breaker (6).

[0006] For a hydraulic breaker energy storage and supercharging system with variable frequency and variable impact power as described above, the inlet port P of the original valve group (5) is connected to the downward pilot end of the second hydraulic directional control valve (901); the upward pilot end of the first hydraulic directional control valve (501) is connected to the upward pilot end of the second hydraulic directional control valve (901); realizing synchronous commutation of the first hydraulic directional control valve (501) and the second hydraulic directional control valve (901).

[0007] For a hydraulic breaker energy storage and supercharging system with variable frequency and variable impact power as described above, the upward pilot end of the first hydraulic directional control valve (501) is connected to the working oil port C of the breaker (6); the return oil port T of the first hydraulic directional control valve (501) is connected to the working oil port B of the breaker (6), the working oil port A1 is connected to the working oil port A of the breaker (6), and the working oil port A1 of the first hydraulic directional control valve (501) is connected to the inlet port P or the return oil port T through switching.

[0008] For a hydraulic breaker energy storage and supercharging system with variable frequency and variable impact power as described above, the controller (4) is respectively connected to the signal ports of the operation button (3), the electromagnetic directional control valve (7), the first proportional pressure reducing valve (801) and the second proportional pressure reducing valve (904).

[0009] For a hydraulic breaker energy storage and supercharging system with variable frequency and variable impact power as described above, the controller (4) dynamically adjusts the switching of the electromagnetic directional control valve (7), and the oil pressures of the first proportional pressure reducing valve (801) and the second proportional pressure reducing valve (904) according to the working state of the breaker (6) under different loads, so as to adjust the impact frequency of the breaker (6).

[0010] The beneficial effects of the present invention are as follows: (1) In the present invention, a throttling energy storage circuit is provided at the oil return port of the breaker, which realizes the replenishment of the oil pressure of the accumulator at the top of the breaker piston, improves the impact work of the breaker, reduces energy consumption, and realizes energy conservation. In addition, for high-load working conditions, an external accumulator group is also provided to compensate the oil pressure of the accumulator at the top of the piston again, realizing variable impact work and high power density output of the breaker. At the same time, the external accumulator group can be independently arranged without increasing the volume of the hammer, improving the impact work in a limited space and increasing the work-to-weight ratio of the breaker. At the same time, the proportional pressure reducing valve is used to control the size of the oil pressure in the circuit, realizing the control of the impact frequency of the breaker and improving the overall working efficiency of the breaker; (2) In the present invention, the throttling energy storage circuit realizes the recycling of energy during the operation of the breaker and acts on the bladder accumulator at the top of the breaker piston to improve the impact work of the breaker. In addition, when the breaker cannot break hard rock under large-load working conditions, the external accumulator group is connected in parallel with the throttling energy storage circuit to jointly act on the bladder accumulator at the top of the breaker piston, realizing high-power output of the breaker; (3) In the present invention, the independent arrangement of the external accumulator group can improve the impact work in a limited space and increase the work-to-weight ratio of the breaker without increasing the volume of the hammer. The use of the proportional pressure reducing valve can dynamically adjust the oil pressure in the circuit according to the external load conditions identified by the controller, realizing the dynamic regulation of the impact frequency. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Wherein: 1. First overflow valve; 2. First hydraulic pump; 3. Operation button; 4. Controller; 5. Original valve group; 501. First hydraulic directional valve; 502. First accumulator; 6. Breaker; 7. Electromagnetic directional valve; 8. Throttling energy storage circuit; 801. First proportional pressure reducing valve; 802. First check valve; 803. Second accumulator; 804. Second check valve; 9. External accumulator group; 901. Second hydraulic directional valve; 902. Third accumulator; 903. Third check valve; 904. Second proportional pressure reducing valve; 905. Second overflow valve; 906. Second hydraulic pump flow valve. Detailed Embodiments

[0013] A hydraulic breaker energy storage and supercharging system with variable frequency and variable impact work provided in this embodiment is as Figure 1 shown, including a first overflow valve 1, a first hydraulic pump 2, an operation button 3, a controller 4, an original valve group 5, a breaker 6, an electromagnetic directional valve 7, a throttling energy storage circuit 8, and an external accumulator group 9.

[0014] The first overflow valve 1 is connected in parallel with the first hydraulic pump 2 and is connected to the oil inlet P of the original valve group 5; the original valve group 5 is connected to the breaker 6, and the oil return port T of the original valve group 5 is connected to the throttle energy storage circuit 8 through the electromagnetic directional valve 7; the external accumulator group 9 is connected to the breaker 6 through the throttle energy storage circuit 8.

[0015] At the upper chamber of the piston of the breaker (6), there is a working oil port A. Below the working oil port A, there is a working oil port B. At the lower chamber of the piston of the breaker (6), there is a working oil port D. Above the working oil port D, there is a working oil port C. At the accumulator on the top of the breaker (6), there is a working oil port E.

[0016] The original valve group 5 includes a first hydraulic directional valve 501 and a first accumulator 502; the throttle energy storage circuit 8 includes a first proportional pressure reducing valve 801, a first check valve 802, a second accumulator 803 and a second check valve 804; the external accumulator group 9 includes a second hydraulic directional valve 901, a third accumulator 902, a third check valve 903, a second proportional pressure reducing valve 904, a second hydraulic pump 906 and a second overflow valve 905.

[0017] The oil inlet P of the first hydraulic directional valve 501 is respectively connected to the downward pilot end of the first hydraulic directional valve 501 and the downward pilot end of the second hydraulic directional valve 901; the upward pilot end of the first hydraulic directional valve 501 is respectively connected to the working oil port C of the breaker 6 and the upward pilot end of the second hydraulic directional valve 901; realizing synchronous commutation of the first hydraulic directional valve 501 and the second hydraulic directional valve 901.

[0018] The oil return port T of the first hydraulic directional valve 501 is connected to the working oil port B of the breaker 6, and at the same time, the oil return port T of the first hydraulic directional valve 501 is connected to the electromagnetic directional valve 7; the working oil port A1 of the first hydraulic directional valve 501 is connected to the working oil port A of the breaker 6, and the working oil port A1 of the first hydraulic directional valve (501) is connected to the oil inlet P or the oil return port T through switching; the first accumulator (502) of the original valve group (5) is respectively connected to the oil inlet P and the working oil port D of the breaker (6).

[0019] The oil inlet of the first proportional pressure reducing valve 801 is connected to the electromagnetic directional valve 7, and the oil outlet of the first proportional pressure reducing valve 801 is connected to the second accumulator 803 through the first check valve 802; the second accumulator 803 is connected to the working oil port E of the breaker 6 through the second check valve 804 to supplement the oil pressure of the accumulator at the top of the piston of the breaker 6, achieving the purpose of impact supercharging.

[0020] The second hydraulic pump 906 and the second overflow valve 905 are in parallel and connected to the inlet port of the second proportional pressure reducing valve 904; the outlet port of the second proportional pressure reducing valve 904 is connected to the third accumulator 902 through the third one-way valve 903; the third accumulator 902 is connected to the second accumulator 803 through the second hydraulic directional control valve 901.

[0021] The signal terminals of the operation button 3, the electromagnetic directional control valve 7, the first proportional pressure reducing valve 801, and the second proportional pressure reducing valve 904 are connected to the controller 4. The controller 4 dynamically adjusts the switching of the electromagnetic directional control valve 7, and the hydraulic pressures of the first proportional pressure reducing valve 801 and the second proportional pressure reducing valve 904 according to the working state of the breaker 6 under different loads, so as to realize the adjustment of the impact frequency of the breaker 6.

[0022] Under low load conditions, the piston of the breaker 6 moves upward, the first hydraulic directional control valve 501 works in the upper position, the downward pilot end pressure is greater than the upward pilot end pressure, the first accumulator 502 stores energy, and the controller 4 controls the electromagnetic directional control valve 7 to work in the right position, and the oil returns to the fuel tank.

[0023] Under low load conditions, the piston of the breaker 6 moves downward, the first hydraulic directional control valve 501 works in the lower position, the downward pilot end pressure is less than the upward pilot end pressure, the first accumulator 502 supplements the accumulator pressure at the top of the piston of the breaker 6, and the controller 4 controls the electromagnetic directional control valve 7 to work in the right position, and the oil returns to the fuel tank.

[0024] Under medium load conditions, the piston of the breaker 6 moves upward, the first hydraulic directional control valve 501 works in the upper position, the downward pilot end pressure is greater than the upward pilot end pressure, the first accumulator 502 stores energy, and the controller 4 controls the electromagnetic directional control valve 7 to work in the left position, and the second accumulator 803 stores energy.

[0025] Under medium load conditions, the piston of the breaker 6 moves downward, the first hydraulic directional control valve 501 works in the lower position, the downward pilot end pressure is less than the upward pilot end pressure, the first accumulator 502 supplements the accumulator pressure at the top of the piston of the breaker 6, and the controller 4 controls the electromagnetic directional control valve 7 to work in the left position, and the second accumulator 803 supplements the accumulator pressure at the top of the piston of the breaker 6.

[0026] Under high load conditions, the piston of the breaker 6 moves upward, the first hydraulic directional control valve 501 and the first hydraulic directional control valve 901 work in the upper position, the downward pilot end pressure is greater than the upward pilot end pressure, the first accumulator 803 stores energy, and the controller 4 controls the electromagnetic directional control valve 7 to work in the left position, and the second accumulator 803 and the third accumulator 902 store energy.

[0027] Under high load conditions, the piston of the breaker 6 moves downward. The first hydraulic directional valve 501 and the first hydraulic directional valve 901 are in the lower position. The downward pilot end pressure is less than the upward pilot end pressure. The first accumulator 502 stores energy. The controller 4 controls the electromagnetic directional valve 7 to work in the left position. The second accumulator 803 and the third accumulator 902 supplement the pressure of the accumulator at the top of the piston of the breaker 6.

[0028] In summary, the throttling energy storage circuit 8 in this embodiment is used to realize the functions of energy storage when the piston of the breaker 6 moves upward and pressure boost when it moves downward, reduce pressure loss to achieve energy saving, and improve the impact work of the breaker 6.

[0029] Under high load conditions, an external accumulator group 9 is set to secondarily compensate the oil pressure of the accumulator at the top of the piston, further improve the impact work of the breaker 6, achieve high power density output of the breaker 6, and achieve the purpose of breaking super-hard rock; the external accumulator group 9 can be independently arranged without increasing the volume of the hammer, can improve the impact work in a limited space, and increase the work-to-weight ratio of the breaker 6.

[0030] In addition, a proportional pressure reducing valve is set on the throttling energy storage circuit 8 and the external accumulator group 9 to realize the control of the oil pressure in the circuit and achieve variable frequency speed regulation of the breaker 6.

[0031] In this embodiment, the system is provided with a throttling energy storage circuit 8 at the oil return port of the breaker 6 to supplement the oil pressure of the accumulator at the top of the piston of the breaker 6, improve the impact work of the breaker 6, reduce energy consumption and achieve energy saving; in addition, for high load conditions, an external accumulator group 9 is also set to secondarily compensate the oil pressure of the accumulator at the top of the piston, achieve variable impact work and high power density output of the breaker 6; at the same time, the external accumulator group 9 can be independently arranged without increasing the volume of the hammer, can improve the impact work in a limited space, and increase the work-to-weight ratio of the breaker 6; at the same time, by controlling the size of the oil pressure in the circuit with a proportional pressure reducing valve, the impact frequency of the breaker 6 is controlled, and the overall working efficiency of the breaker 6 is improved.

[0032] In addition to the above embodiments, the present invention can also have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A variable frequency and variable impact power hydraulic breaker energy storage and boosting system, characterized in that: The invention comprises a first overflow valve (1), a first hydraulic pump (2), an operating button (3), a controller (4), an original valve group (5), a breaker (6), an electromagnetic reversing valve (7), a throttling energy storage circuit (8), and an external accumulator group (9); a working oil port A is provided at the upper cavity of the breaker (6) piston, a working oil port B is provided below the working oil port A, a working oil port D is provided at the lower cavity of the breaker (6) piston, a working oil port C is provided above the working oil port D, and a working oil port E is provided on the accumulator at the top of the breaker (6); The first overflow valve (1) is connected in parallel with the first hydraulic pump (2) and is also connected to the oil inlet P of the original valve group (5); the original valve group (5) is connected to the breaker (6), and the oil return port T of the original valve group (5) is connected to the throttling energy storage circuit (8) through the electromagnetic reversing valve (7); the throttling energy storage circuit (8) is connected to the breaker (6); the external accumulator group (9) is connected to the breaker (6) through the throttling energy storage circuit (8); The throttling energy storage circuit (8) comprises a first proportional pressure reducing valve (801), a first non-return valve (802), a second accumulator (803) and a second non-return valve (804); the oil inlet of the first proportional pressure reducing valve (801) is connected to the electromagnetic reversing valve (7), and the oil outlet is connected to the second accumulator (803) via the first non-return valve (802); the second accumulator (803) is connected to the working oil port E of the breaker (6) via the second non-return valve (804); The external accumulator group (9) comprises a second hydraulic reversing valve (901), a third accumulator (902), a third non-return valve (903), a second proportional pressure reducing valve (904), a second hydraulic pump (906) and a second overflow valve (905), and the second hydraulic reversing valve (901) is synchronously reversing with the original valve group (5); the second hydraulic pump (906) and the second overflow valve (905) are connected in parallel and are connected to the oil inlet of the second proportional pressure reducing valve (904); the oil outlet of the second proportional pressure reducing valve (904) is connected to the third accumulator (902) via the third non-return valve (903); and the third accumulator (902) is connected to the second accumulator (803) via the second hydraulic reversing valve (901).

2. The variable frequency and variable impact power hydraulic breaker energy storage and pressurization system according to claim 1 is characterized in that: The original valve group (5) comprises a first hydraulic reversing valve (501) and a first accumulator (502); an oil inlet P of the original valve group (5) is connected to a downward pilot end of the first hydraulic reversing valve (501); and the first accumulator (502) of the original valve group (5) is respectively connected to the oil inlet P and a working oil port D of a breaker (6).

3. The variable frequency and variable impact power hydraulic breaker energy storage and pressurization system according to claim 2 is characterized in that: The oil inlet P of the original valve group (5) is connected to the downward pilot end of the second hydraulic reversing valve (901); the upward pilot end of the first hydraulic reversing valve (501) is connected to the upward pilot end of the second hydraulic reversing valve (901); and synchronous reversing of the first hydraulic reversing valve (501) and the second hydraulic reversing valve (901) is achieved.

4. The variable frequency and variable impact power hydraulic breaker energy storage and boosting system according to claim 2 is characterized in that: The upward pilot end of the first hydraulic reversing valve (501) is connected to the working oil port C of the breaker (6); the oil return port T of the first hydraulic reversing valve (501) is connected to the working oil port B of the breaker (6); the working oil port A1 is connected to the working oil port A of the breaker (6); and the working oil port A1 of the first hydraulic reversing valve (501) is connected to the oil inlet port P or the oil return port T through switching.

5. The variable frequency and variable impact power hydraulic breaker energy storage and pressurization system according to claim 1 is characterized in that: The controller (4) is respectively connected to the signal ports of the operating button (3), the electromagnetic reversing valve (7), the first proportional pressure reducing valve (801) and the second proportional pressure reducing valve (904).

6. The variable frequency and variable impact power hydraulic breaker energy storage and pressurization system according to claim 5, characterized in that: The controller (4) dynamically adjusts the switching of the electromagnetic reversing valve (7), the oil pressure of the first proportional pressure reducing valve (801) and the second proportional pressure reducing valve (904) according to the working state of the breaker (6) under different loads, so as to adjust the impact frequency of the breaker (6).

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