Hybrid power energy recovery system of hydraulic load platform

Abstract

The hydraulic load platform hybrid power energy recovery system comprises a main loop and a balance loop, the main loop comprises an oil tank, a hydraulic pump, a motor, a first hydraulic cylinder and a second hydraulic cylinder, the hydraulic pump is in transmission connection with the motor, an oil inlet of the hydraulic pump is connected with the oil tank, and an oil outlet of the hydraulic pump is connected with the balance loop. An oil outlet of the hydraulic pump is connected with an oil inlet of the first one-way valve, and an oil outlet of the first one-way valve is connected with an oil return opening of the throttling valve, an oil outlet of the second one-way valve and a P opening of the three-position four-way reversing valve at the same time. The main loop energy regeneration function is achieved, the size of the oil tank is reduced, and therefore the size of the whole lifting device is reduced; in addition, due to the fact that the balance loop and the energy accumulator are adopted, on one hand, gravitational potential energy generated when the lifting device descends can be recycled and reused, and on the other hand, the energy accumulator is adopted as a storage unit of the gravitational potential energy, and the vibration phenomenon when the lifting device stops can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to a hybrid power energy recovery system for a hydraulic load platform, belonging to the technical field of hydraulic control. Background Art

[0002] During the construction process, lifting devices are frequently used. When the lifting device descends, there will be a large gravitational potential energy. In traditional lifting devices, this part of the gravitational potential energy is generally lost in the form of heat energy, resulting in a large energy loss. At the same time, since the hydraulic system will have a large vibration when it stops. In addition, some lifting device hydraulic systems require a large amount of hydraulic oil, so a larger oil tank will be used, resulting in a larger space occupation area. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a small-sized, energy-saving, vibration-reducing hydraulic load platform hybrid power energy recovery system to overcome the deficiencies in the prior art.

[0004] The technical solution of the utility model is as follows: a hybrid power energy recovery system for a hydraulic load platform, comprising a main circuit and a balancing circuit, wherein the main circuit comprises an oil tank, a hydraulic pump, a motor, a first hydraulic cylinder and a second hydraulic cylinder, wherein the hydraulic pump is connected to the motor in a transmission manner, the oil inlet of the hydraulic pump is connected to the oil tank, the oil outlet of the hydraulic pump is connected to the oil inlet of a first one-way valve, the oil outlet of the first one-way valve is simultaneously connected to the oil return port of a throttle valve, the oil outlet of a second one-way valve and the P port of a three-position four-way reversing valve, the A port of the three-position four-way reversing valve is simultaneously connected to the rodless chambers of the first hydraulic cylinder and the second hydraulic cylinder The rod chambers of the first hydraulic cylinder and the second hydraulic cylinder are connected to the B port of the three-position four-way reversing valve, and the T port of the three-position four-way reversing valve is simultaneously connected to the left position of the first two-position two-way reversing valve and the oil inlet of the second one-way valve; the balancing circuit includes a third hydraulic cylinder and an accumulator, the rodless chamber of the third hydraulic cylinder is connected to the lower position of the second two-position two-way reversing valve, the second two-position two-way reversing valve is simultaneously connected to the accumulator, the oil outlet of the third one-way valve and the third two-position two-way reversing valve, the third two-position two-way reversing valve is connected to the rod chamber of the third hydraulic cylinder, and the oil inlet of the third one-way valve is connected to the oil tank.

[0005] Furthermore, the oil outlet of the hydraulic pump is connected to the oil tank through a first overflow valve.

[0006] Furthermore, the second two-position two-way reversing valve is also connected to the oil tank through a second overflow valve.

[0007] Furthermore, an oil filter is installed at the oil inlet of the hydraulic pump.

[0008] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0009] 1. The utility model realizes the energy regeneration function of the main circuit, reduces the volume of the oil tank, and thus reduces the volume of the entire lifting device.

[0010] 2. The use of a balancing circuit and an accumulator can, on the one hand, recover and reuse the gravitational potential energy generated by the lifting device when it is descending; on the other hand, the use of an accumulator as a storage unit for gravitational potential energy can effectively reduce the vibration of the lifting device when it stops. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Explanation of the accompanying drawings: 1-oil tank, 2-oil filter, 3-first overflow valve, 4-hydraulic pump, 5-motor, 6-first non-return valve, 7-first two-position two-way reversing valve, 8-throttle valve, 9-second non-return valve, 10-three-position four-way reversing valve, 11-first hydraulic cylinder, 12-second hydraulic cylinder, 13-third hydraulic cylinder, 14-second two-position two-way reversing valve, 15-second overflow valve, 16-accumulator, 17-third non-return valve, 18-third two-position two-way reversing valve. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0014] Embodiment of the utility model: The structural diagram of the hydraulic load platform hybrid power energy recovery system is as follows Figure 1 As shown, it includes a main circuit and a balancing circuit, the main circuit includes an oil tank 1, a hydraulic pump 4, a motor 5, a first hydraulic cylinder 11 and a second hydraulic cylinder 12, the hydraulic pump 4 is drivingly connected to the motor 5, the oil inlet of the hydraulic pump 4 is connected to the oil tank 1, the oil outlet of the hydraulic pump 4 is connected to the oil inlet of the first one-way valve 6, the oil outlet of the first one-way valve 6 is simultaneously connected to the oil return port of the throttle valve 8, the oil outlet of the second one-way valve 9 and the P port of the three-position four-way reversing valve 10, the A port of the three-position four-way reversing valve 10 is simultaneously connected to the rodless chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12, the The rod chamber is connected to the B port of the three-position four-way reversing valve 10, and the T port of the three-position four-way reversing valve 10 is simultaneously connected to the left position of the first two-position two-way reversing valve 7 and the oil inlet of the second one-way valve 9; the balancing circuit includes a third hydraulic cylinder 13 and an accumulator 16, the rodless chamber of the third hydraulic cylinder 13 is connected to the lower position of the second two-position two-way reversing valve 14, the second two-position two-way reversing valve 14 is simultaneously connected to the accumulator 16, the oil outlet of the third one-way valve 17 and the third two-position two-way reversing valve 18, the third two-position two-way reversing valve 18 is connected to the rod chamber of the third hydraulic cylinder 13, and the oil inlet of the third one-way valve 17 is connected to the oil tank 1.

[0015] The oil outlet of the hydraulic pump 4 is connected to the oil tank 1 through the first relief valve 3. The second two-position two-way reversing valve 14 is also connected to the oil tank 1 through the second relief valve 15. The oil inlet of the hydraulic pump 4 is equipped with an oil filter 2.

[0016] The working principle of this utility model:

[0017] When the lifting device descends, the three-position four-way reversing valve 10 works in the right position, the first two-position two-way reversing valve 7 works in the left position, and the second two-position two-way reversing valve 14 and the third two-position two-way reversing valve 18 work in the upper position. The motor 4 drives the hydraulic pump 5 to rotate, providing high-pressure oil for the entire system. The hydraulic oil at the oil outlet of the hydraulic pump 4 enters the P port of the three-position four-way reversing valve 10 through the first check valve 6, and then enters the rod chamber of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 through the B port of the three-position four-way reversing valve 10. The hydraulic oil in the rodless chamber of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 enters the second check valve 9 through the T port of the three-position four-way reversing valve 10, and then flows into the oil outlet of the first check valve 6 through the second check valve 9, and enters the rod chamber of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 together with the high-pressure oil discharged by the hydraulic pump 4. Therefore, the displacement of the pump can be reduced, and the flow regeneration function is realized. At this time, the first hydraulic cylinder 11 and the second hydraulic cylinder 12 begin to descend. At the same time, after the hydraulic oil in the rodless chamber of the third hydraulic cylinder 13 passes through the second two-position two-way reversing valve 14, a part of the hydraulic oil continues to pass through the third two-way reversing valve 18 and finally enters the rod chamber of the third hydraulic cylinder 13, and the other part of the hydraulic oil enters the accumulator 16 to recover the potential energy generated when the lifting device is lowered. During the descent of the lifting device, the first relief valve 3 and the second relief valve 15 play a safety protection role.

[0018] When the lifting device rises, at this time, the three-position four-way reversing valve 10 works in the left position, the first two-position two-way reversing valve 7 works in the right position, and the second two-position two-way reversing valve 14 and the third two-position two-way reversing valve 18 work in the upper position. The motor 4 drives the hydraulic pump 5 to rotate, providing high-pressure oil for the entire system. The hydraulic oil at the oil outlet of the hydraulic pump 4 passes through the first one-way valve 6 and enters the P port of the three-position four-way reversing valve 10, and then enters the rodless chamber of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 from the P port of the three-position four-way reversing valve 10. The hydraulic oil in the rod chamber of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 passes through the T port of the three-position four-way reversing valve 10, and then flows back to the oil tank 1 through the first two-position two-way reversing valve 7, and the first hydraulic cylinder 11 and the second hydraulic cylinder 12 begin to rise. At the same time, the high-pressure oil stored in the accumulator 16 enters the rodless chamber of the third hydraulic cylinder 13 through the second two-position two-way reversing valve 14, and the hydraulic oil in the rod chamber of the third hydraulic cylinder 13 flows into the rodless chamber of the third hydraulic cylinder 13 through the third two-position two-way reversing valve 18 and the second two-position two-way reversing valve 14. At this time, the third hydraulic cylinder 13, the first hydraulic cylinder 11 and the second hydraulic cylinder 12 rise synchronously. Since the area of ​​the rodless chamber and the rod chamber of the third hydraulic cylinder 13 is inconsistent, if the hydraulic oil of the rod chamber of the third hydraulic cylinder 13 and the accumulator 16 cannot fully meet the hydraulic oil required by the rodless chamber of the third hydraulic cylinder 13, at this time, the third one-way valve 17 plays a role in replenishing hydraulic oil. During the lifting device rising process, the first relief valve 3 and the second relief valve 15 play a role in safety protection.

[0019] When the lifting device stops, at this time, the three-position four-way reversing valve 10 works in the middle position, the first two-position two-way reversing valve 7 works in the left position, the second two-position two-way reversing valve 14 and the third two-position two-way reversing valve 18 work in the lower position, and the motor 4 stops providing power.

[0020] The above is a detailed description of the implementation methods of the utility model in conjunction with the accompanying drawings, but the utility model is not limited to the described implementation methods. For those skilled in the art, without departing from the principle and spirit of the utility model, various changes, modifications, substitutions and variations are made to these implementation methods, which still fall within the scope of protection of the utility model. Finally, it should be noted that the contents not described in detail in the specification belong to the prior art known to professional and technical personnel in the field, and those skilled in the art can realize them without creative work, so they will not be repeated here.

Claims

1. A hydraulic load platform hybrid power energy recovery system, comprising a main circuit and a balancing circuit, characterized in that: The main circuit comprises an oil tank (1), a hydraulic pump (4), a motor (5), a first hydraulic cylinder (11) and a second hydraulic cylinder (12); the hydraulic pump (4) is connected to the motor (5) by transmission; the oil inlet of the hydraulic pump (4) is connected to the oil tank (1); the oil outlet of the hydraulic pump (4) is connected to the oil inlet of a first one-way valve (6); the oil outlet of the first one-way valve (6) is simultaneously connected to the oil return port of a throttle valve (8), the oil outlet of a second one-way valve (9) and the P port of a three-position four-way reversing valve (10); the A port of the three-position four-way reversing valve (10) is simultaneously connected to the rodless chambers of the first hydraulic cylinder (11) and the second hydraulic cylinder (12); the rod chambers of the first hydraulic cylinder (11) and the second hydraulic cylinder (12) are simultaneously connected to the rod chambers of the first hydraulic cylinder (11) and the second hydraulic cylinder (12). The balancing circuit comprises a third hydraulic cylinder (13) and an accumulator (16); the rodless chamber of the third hydraulic cylinder (13) is connected to the lower position of the second two-position two-way directional valve (14); the second two-position two-way directional valve (14) is connected to the accumulator (16), the oil outlet of the third one-way valve (17) and the third two-position two-way directional valve (18); the third two-position two-way directional valve (18) is connected to the rod chamber of the third hydraulic cylinder (13); and the oil inlet of the third one-way valve (17) is connected to the oil tank (1).

2. The hydraulic load platform hybrid power energy recovery system according to claim 1, characterized in that: The oil outlet of the hydraulic pump (4) is connected to the oil tank (1) via a first overflow valve (3).

3. The hydraulic load platform hybrid power energy recovery system according to claim 1, characterized in that: The second two-position two-way reversing valve (14) is also connected to the oil tank (1) via a second overflow valve (15).

4. The hydraulic load platform hybrid power energy recovery system according to claim 1, characterized in that: An oil filter (2) is installed at the oil inlet of the hydraulic pump (4).

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