CN205618450U - Hydraulic system divides fender energy storage ware energy recuperation device - Google Patents

Abstract

The utility model discloses an energy recovery device for geared accumulators of a hydraulic system, which comprises a controller (1), a high-pressure accumulator (2), a low-pressure accumulator (3), a first pressure sensor (4), a second Two pressure sensors (5), the first one-way valve (6), (7), three-position three-way electromagnetic directional valve (8), the first proportional flow valve (9), the second proportional flow valve (10), the first An energy recovery device composed of a three-proportional flow valve (11), an oil inlet PO, an oil return port T, and an oil outlet P1. The device is installed on the oil circuit of the hydraulic cylinder, and the two (or more than two) accumulators used are connected in parallel in the same circuit. According to the inflation pressure, it is divided into two gears, one high and one low. According to the size of the load, it can absorb energy in stages and release energy in stages. Under the premise of satisfying the speed regulation function of the system, the performance of the accumulator can be optimized, the energy can be recovered to the maximum extent, and the energy absorption efficiency of the accumulator can be improved.

Description

Energy recovery device for step-by-step accumulator of hydraulic system

technical field

The utility model relates to the field of mechanical engineering, in particular to the energy-saving technology of hydraulic systems of mechanical equipment.

Background technique

In the application of the mechanical hydraulic system, a hydraulic valve capable of generating back pressure is often used on the oil return circuit of the actuator (such as the boom lift cylinder of the excavator) to control the pressure and flow of the return oil, so as to control the actuator to obtain a smooth operation. Movement, such as the boom lowering energy of a hydraulic excavator, controls the movement through the throttling speed limit valve. The throttling speed-limiting valve consumes the potential energy of boom lowering and generates heat to heat up the hydraulic system, which affects the performance and life of the hydraulic system.

As an important component of the hydraulic system, the accumulator is often used in the hydraulic system, which plays an important role in absorbing pressure fluctuations, reducing noise, and reducing shock. In addition, accumulators are often used as auxiliary power sources for energy recovery and release of hydraulic systems. However, due to different mechanical equipment and different working conditions of the equipment, the performance requirements of the accumulator vary greatly. , It is difficult to take into account various factors (such as life, sensitivity, volume, pressure range, energy absorption efficiency, etc.) by using an accumulator. This is especially true for construction machinery whose working conditions and loads vary greatly and frequently. For this reason, the utility model takes the arm recovery system of an excavator as an example, adopts 2 (or more than 2) accumulators in parallel in the same circuit, and divides them into two gears according to the inflation pressure, one high and one low. Accumulator, according to the size of the load, the accumulator can absorb energy in stages and release energy in stages. Under the premise of satisfying system back pressure adjustment and speed adjustment, the performance of the accumulator can be optimized, the energy can be recovered to the maximum extent, and the energy absorption efficiency of the accumulator can be improved.

Utility model content

In view of the above shortcomings of the prior art, the purpose of this utility model is to provide a step-by-step energy recovery device, which can absorb energy in steps and release energy in steps according to the size of the load. Under the premise of satisfying the speed regulation function of the system, the performance of the accumulator can be optimized, the energy can be recovered to the maximum extent, and the energy absorption efficiency of the accumulator can be improved.

The purpose of this utility model is achieved by the following means.

The energy recovery device for step-by-step accumulators in the hydraulic system consists of a controller 1, a high-pressure accumulator 2, a low-pressure accumulator 3, a first pressure sensor 4, a second pressure sensor 5, a first one-way valve 6, and a second one-way valve. Directional valve 7, three-position three-way electromagnetic directional valve 8, first proportional flow valve 9, second proportional flow valve 10, third proportional flow valve 11, oil inlet PO, oil return port T, and oil outlet P1;

Its hydraulic connection relationship is as follows: the oil inlet PO is respectively connected with the third proportional flow valve 11 and the three-position three-way electromagnetic reversing valve 8; the third proportional flow valve 11 is connected with the oil return port T and the oil tank 12 in turn; The electromagnetic reversing valve 8 is divided into two paths, one path is connected with the first one-way valve 6, the first pressure sensor 4, and the high-pressure accumulator 2 in sequence; the other path is connected with the second one-way valve 7, the second pressure sensor 5, The low-pressure accumulator 3 is connected; the first proportional flow valve 9 is connected on the oil circuit between the high-pressure accumulator 2 and the first one-way valve 6; between the low-pressure accumulator 3 and the second one-way valve 7 The second proportional flow valve 10 is connected to the oil circuit; the first proportional flow valve 9 is connected to the oil outlet P1; the second proportional flow valve 10 is connected to the oil outlet P1; the oil outlet P1 is connected to the one-way valve 15 and the reversing On the oil road between the valves 17; the oil return port T is connected with the oil tank 12.

In addition, the throttle valve 18 is eliminated in the hydraulic system of the boom adopting the step-by-step energy recovery device; the force sensor 22 is installed on the boom cylinder 19, and the electromagnetic reversing valve 21 is installed on the oil circuit of the lower chamber.

Electrical connections: controller 1 is connected with three proportional flow valves, three-position three-way electromagnetic directional valve 8, two pressure sensors, force sensor 22, and electromagnetic directional valve 21 respectively.

Description of drawings:

Fig. 1 Schematic diagram of the principle of the hydraulic system of the boom without installing the split energy recovery device.

Fig. 2 is a schematic diagram of the principle of the hydraulic system of the boom with the split gear energy recovery device installed.

In the figure: 1-controller 2-high pressure accumulator 3-low pressure accumulator 4-first pressure sensor 5-second pressure sensor 6-first check valve 7-second check valve 8-three-position three Electromagnetic directional valve 9-first proportional flow valve 10-second proportional flow valve 11-third proportional flow valve 12-oil tank 13-hydraulic pump 14-motor (or other power) 15-third one-way valve 16-overflow Throttle valve 17-three-position four-way reversing valve (or multi-way valve) 18-throttle valve 19-boom cylinder 20-load 21-electromagnetic reversing valve 22-force sensor

detailed description:

Figure 1 is a schematic diagram of the principle of a traditional excavator arm hydraulic system as an example

The mechanical connection relationship is: the motor 14 is mechanically connected to the hydraulic pump 13; the hydraulic connection relationship is: the hydraulic pump 13 is connected to the oil tank 12, the third check valve 15, and the overflow valve 16 through the oil pipe; the overflow valve 16 is connected to the oil tank through the oil pipe 12 connection; the third one-way valve 15 is sequentially connected with the three-position four-way directional valve (or multi-way valve) 17 and the upper cavity of the oil cylinder 19; the lower cavity of the boom cylinder 19 is connected with the throttle valve 18; the throttle valve 18 is connected with the electromagnetic The reversing valve 21 is connected; the reversing valve is connected with the fuel tank 12 .

Figure 2 is a schematic diagram of the principle of the step-by-step energy recovery device of the utility model on the oil return road of the large chamber of the boom hydraulic cylinder. The step-by-step energy recovery device is composed of a controller 1, a high-pressure accumulator 2, a low Accumulator 3, first pressure sensor 4, second pressure sensor 5, first one-way valve 6, second one-way valve 7, three-position three-way electromagnetic reversing valve 8, three proportional flow valves 9, 10, 11. Composed of oil inlet PO, oil return port T, and oil outlet P1.

Next, take the working process of the hydraulic excavator arm cylinder 19 as an example to illustrate how the step-by-step energy recovery device works.

For the traditional excavator arm hydraulic system without energy recovery (as shown in Figure 1), when the oil cylinder 19 is working, when the large chamber of the arm oil cylinder 19 enters oil and the arm oil cylinder 19 lifts heavy objects, the energy consumed can be regarded as effective energy . When oil enters the small chamber, the boom is lowered. At this time, the boom has huge potential energy under the action of heavy objects or external loads. The lowering of the boom does work on the piston of the boom cylinder 19, accelerating the movement of the boom cylinder 19. In order to make the boom stable Usually, a throttle valve 18 is installed on the oil return line, and the oil return line of the boom will generate appropriate back pressure and flow to achieve smooth movement. When the oil flows through the throttle valve 18, this part of the energy becomes heat energy. Lost in vain.

(1) When the hydraulic system of the excavator needs energy recovery, connect the split energy recovery device to the boom hydraulic system of the excavator (as shown in Figure 2)

(2) When it is necessary to recover these energies, the electromagnetic switch valve 21 is energized, and the circuit of the boom cylinder 19 leading to the reversing valve 17 in the original system is cut off; at the same time, the three-position three-way electromagnetic switch valve 8 is energized and enters the boom recycling status. The load is measured by the force sensor 22, and the control system issues the required ideal PO and Q0 commands.

If the required P0 is greater than the inflation pressure of the high-pressure accumulator 2, the three-position three-way electromagnetic switch valve 8 is controlled to work in the upper position, and the oil return from the large cavity of the boom oil cylinder 19 passes through the three-position three-way electromagnetic switch valve 8, the first unit Fill the high-pressure accumulator 2 into the valve 6, and the excess flow flows back to the oil tank 12 through the proportional throttle valve 11 and the T port.

If the required P0 is lower than the charging pressure of the high-pressure accumulator 2 and higher than the charging pressure of the low-pressure accumulator 3, control the three-position three-way electromagnetic switch valve 8 to work in the lower position, and the large chamber of the boom cylinder 19 returns oil The low-pressure accumulator 3 is charged into the low-pressure accumulator 3 through the three-position three-way electromagnetic switch valve 8, 7, and the excess flow flows back to the oil tank 12 through the proportional throttle valve 11 and the T port.

Therefore, no matter whether the return oil required by the boom is high pressure or low pressure, energy can be recovered.

If the required P0 is less than the inflation pressure of the low-pressure accumulator 3, control the three-position three-way electromagnetic switch valve 8 to work in the neutral position, and the oil return from the large chamber of the boom cylinder 19 flows back through the proportional throttle valve 11 and the T port. Fuel tank 2.

(3) When the boom cylinder 19 needs to be lifted, the load is measured by the force sensor 22, and the oil pressure of the accumulators 2 and 3 are measured by the pressure sensors 4 and 5 respectively. If the pressure in the large chamber of the oil cylinder 19 that lifts the cargo is within the working pressure range of the high-pressure accumulator 2, the first proportional flow valve 9 is opened, and the high-pressure accumulator 2 supplies oil to the system together with the hydraulic pump 13 through the first proportional flow valve 9. liquid; if the pressure of the large cavity for lifting cargo is within the working range of the low-pressure accumulator 3, the second proportional flow valve 10 is opened, and the low-pressure accumulator 3 flows to the boom system together with the hydraulic pump 13 through the second proportional flow valve 10. Provide oil.

Claims (4)

1. The energy recovery device for step-by-step accumulators in the hydraulic system is characterized in that it consists of a controller (1), a high-pressure accumulator (2), a low-pressure accumulator (3), a first pressure sensor (4), and a second pressure sensor (4). Pressure sensor (5), first one-way valve (6), second one-way valve (7), three-position three-way electromagnetic directional valve (8), first proportional flow valve (9), second proportional flow valve ( 10), the third proportional flow valve (11), the oil inlet PO, the oil return port T, and the oil outlet P1; The hydraulic connection relationship is as follows: the oil inlet PO is connected to the third proportional flow valve (11) and the three-position three-way electromagnetic reversing valve (8); the third proportional flow valve (11) is connected to the oil return port T and the oil tank in turn. (12) connection; the three-position three-way electromagnetic reversing valve (8) is divided into two paths, and one path is connected with the first one-way valve (6), the first pressure sensor (4), and the high-pressure accumulator (2) successively; the other One way is sequentially connected with the second one-way valve (7), the second pressure sensor (5), and the low-pressure accumulator (3); the oil between the high-pressure accumulator (2) and the first one-way valve (6) The first proportional flow valve (9) is connected on the road; the second proportional flow valve (10) is connected on the oil circuit between the low-pressure accumulator (3) and the second check valve (7); the first proportional flow valve (9) connected with the oil outlet P1; the second proportional flow valve (10) is connected with the oil outlet P1; the oil outlet P1 is connected on the oil circuit between the one-way valve (15) and the reversing valve (17); The oil return port T is connected with the oil tank (12). 2. The energy recovery device for geared accumulators in hydraulic systems according to claim 1, characterized in that at least two accumulators are connected in parallel in the same circuit, and the accumulators are divided into at least two gears according to the inflation pressure. That is, there are at least a low-pressure accumulator (3) and a high-pressure accumulator (2). 3. The energy recovery device for geared accumulators in hydraulic systems according to claim 1, characterized in that a force sensor (22) is arranged on the arm cylinder (19), and an electromagnetic reversing valve ( twenty one). 4. The energy recovery device for geared accumulators in hydraulic systems according to claim 1, characterized in that the third proportional flow valve (11) is connected to the oil cylinder (19) for unloading.