CN204403006U - A kind of can recovery test power consumption oil hydraulic pump and motor test rig - Google Patents

Abstract

The utility model discloses a hydraulic pump and a motor test bench which can recover the energy consumption of the test. The power synthesis box has two input shaft ends and one output shaft end; the first input shaft end of the power synthesis box and the output shaft of the prime mover The second input shaft end is connected with the output shaft of the gearbox, the output shaft end of the power synthesis box is connected with the input shaft of the test hydraulic pump through the test pump input sensor; the output oil port of the test hydraulic pump is connected to the The reversing valve is provided with a loading valve on the hydraulic pipeline; the reversing valve is connected to the two working oil ports of the test hydraulic motor; the output shaft of the test hydraulic motor is connected to the input shaft of the reversing box through the test motor output sensor, and the reversing The output shaft of the box is connected to the input shaft of the gearbox. The utility model can not only carry out stepless loading on the test pump and motor; but also can return the mechanical energy output by the test motor to the input shaft of the test hydraulic pump to become the test power; the energy recovery method is simple.

Description

A hydraulic pump and motor test bench capable of recovering test energy consumption

【Technical field】

The utility model relates to a test bench for hydraulic pumps and hydraulic motors, in particular to a test bench suitable for power characteristic detection and reliability assessment of various hydraulic pumps and motors.

【Background technique】

Hydraulic pump and hydraulic motor test bench (hereinafter referred to as "test bench") is the necessary equipment for performance testing, reliability assessment and related law research on hydraulic pumps and hydraulic motors.

There are two loading methods for the hydraulic pump test bench: the first one is to apply pressure to the hydraulic oil output by the hydraulic pump under test by using the overflow valve throttling method. In this way, all the energy output by the hydraulic pump under test is converted into heat energy consumption. This makes the test consume a lot of energy, especially when performing high-power and long-term tests. The second is to design an energy recovery device to recycle the energy output by the hydraulic pump under test. There are two energy recovery methods: one is to convert the mechanical energy output by the hydraulic pump under test into electrical energy recovery. This recovery method The equipment is complex, expensive, and difficult to install and debug; another energy recovery method is to directly recover the mechanical energy output by the hydraulic pump under test. The application number is 201210094856.0, and the Chinese patent titled "Hydraulic Pump Adaptive Power Test Bench" discloses a A test bench adopts the method of direct recovery of mechanical energy. All the energy output by the tested hydraulic pump of this test bench passes through a throttle valve, and the energy consumption is relatively large. At the same time, this test bench has difficulty in loading load control and poor working stability. Shortcomings.

At present, there are mainly two types of hydraulic motor test benches: direct loading and energy recovery loading. The Chinese patent with the application number CN201410307125.9 and titled "Hydraulic Motor Test Bench" discloses a hydraulic motor test scheme, which uses direct loading and consumes a lot of energy during high-power and life tests. According to the different energy recovery methods, the hydraulic motor test bench adopting the energy recovery method can be divided into two types: the electric energy recovery method and the mechanical energy direct recovery method. The electric energy recovery method is technically complex, expensive, and the recovery efficiency is not high; the Chinese patent with the application number CN201210437532.2 and the name "Hydraulic Motor Test System" discloses a hydraulic motor test scheme for direct recovery of mechanical energy, which has many components. The structure is complicated, and the energy-saving effect is not ideal.

At the same time, all the above-mentioned loading methods have the disadvantage of unsatisfactory application of dynamic load.

The Chinese patent with the application number CN201310394825.1 and titled "A Reliability Test Method and Device for Axial Piston Pumps and Motors" discloses a hydraulic pump and motor test bench scheme for direct recovery of mechanical energy, which will be tested The hydraulic pump and the tested hydraulic motor are respectively connected to both ends of a double-shaft motor, so that the motor shaft not only bears the torque generated by the motor itself, but also bears the torque generated by the power recovered by the system, causing the motor to be stressed. Unreasonable; in addition, this device can only be used to test the hydraulic motor of the hydraulic pump whose rotation speed and direction are compatible with each other, and cannot use one hydraulic pump to test both rotation directions of the hydraulic motor.

【Content of utility model】

The purpose of the utility model is to provide a hydraulic pump and motor test bench which can recover the energy consumed by the test. It has a simple structure and good loading performance, and can directly recover the mechanical energy of the test load, so as to overcome the technical problems in the above-mentioned prior art.

In order to achieve the above object, the utility model adopts the following technical solutions:

A hydraulic pump and motor test bench capable of recovering test energy consumption, including prime mover, power synthesis box, test pump input sensor, hydraulic oil tank, test hydraulic pump, loading valve, reversing valve, test hydraulic motor, test motor output sensor , reversing box and gearbox; the power synthesis box has two input shaft ends and one output shaft end; the first input shaft end of the power synthesis box is connected with the output shaft of the prime mover, and the second input shaft end is connected with the gearbox The output shaft is connected. The output shaft end of the power synthesis box is connected with the input shaft of the test hydraulic pump through the test pump input sensor; Valve; A port and B port of the reversing valve are connected to the two working oil ports of the test hydraulic motor; the output shaft of the test hydraulic motor is connected to the input shaft of the reversing box through the test motor output sensor, and the output shaft of the reversing box is connected to the speed changer. box input shaft.

Preferably, the hydraulic pipeline is further provided with a safety valve and an anti-cavitation check valve.

Preferably, the prime mover is a speed-regulating motor, the power synthesis box is a gear transmission type power synthesis box, the loading valve is an electromagnetic proportional overflow valve, and the reversing valve is an electromagnetic reversing valve.

Preferably, a hydraulic pipeline is arranged between the output oil port of the test hydraulic pump and the P port of the reversing valve; the A port and the B port of the reversing valve are connected with the two working oil ports of the test hydraulic motor, and the T of the reversing valve The port is connected to the hydraulic oil tank through the oil filter.

Preferably, the test pump input sensor and the test motor output sensor are used to detect the rotational speed and torque of the shaft on which the detector is located.

Preferably, the prime mover is an AC variable-frequency speed-regulating motor, an AC electromagnetic speed-regulating motor or a DC speed-regulating motor, the power synthesis box is a chain-driven power synthesis box, the loading valve is a throttle valve, and the inverter The directional valve is a manual reversing valve, the test hydraulic pump is a two-way variable pump, and the test hydraulic motor is a two-way variable motor; the two oil ports of the two-way variable pump are connected to the two alternating oil ports of the rectification valve block through pipelines , the oil outlet of the rectification valve block is connected to the P port of the reversing valve through the pipeline connection, and the oil inlet of the rectification valve block is connected to the hydraulic oil tank through the oil filter; the rectification valve block is four rectification check valves Composed of bridge rectifier valve block.

Compared with the existing test bench, the beneficial effect of the utility model is: a hydraulic pump and motor test bench of the utility model that can recover test energy consumption can not only carry out stepless loading on the test pump and motor; The output mechanical energy returns to the input shaft of the test hydraulic pump and becomes the test power. The energy recovery method is simple; the hydraulic oil flow through the loading valve is small, which can reduce the mass and force of the loading valve spool, realize good dynamic loading characteristics, and realize high-frequency dynamic loading.

【Description of drawings】

Fig. 1 is the schematic diagram of the utility model 1st embodiment;

Fig. 2 is a schematic diagram of the second embodiment of the utility model.

In the figure: 1 is the prime mover, 2 is the power synthesis box, 3 is the test pump input sensor, 4 is the hydraulic oil tank, 5 is the oil filter, 6 is the test hydraulic pump, 7 is the loading valve, 8 is the safety valve, 9 is the Anti-cavitation one-way valve, 10 is a reversing valve, 11 is a test hydraulic motor, 12 is a test motor output sensor, 13 is a reversing box, 14 is a gearbox, and 15 is a rectifier valve block.

【Detailed ways】

first embodiment

Please refer to shown in Fig. 1, a kind of hydraulic pump and the motor test bench that can recycle test energy consumption of the present utility model include prime mover (in Fig. ) 2, test pump input sensor 3, hydraulic oil tank 4, oil filter 5, test hydraulic pump 6, loading valve (electromagnetic proportional overflow valve in Figure 1) 7, safety valve 8, anti-cavitation check valve 9, Reversing valve (electromagnetic reversing valve in Fig. 1) 10, test hydraulic motor 11, test motor output sensor 12, reversing box 13, gearbox 14 and some pressure gauges, flow meters.

The power synthesis box 2 has two input shaft ends and an output shaft end. Its first input shaft end is connected with the output shaft of prime mover 1, and the second input shaft end is connected with the output shaft of gearbox 14, and the output shaft end of power synthesis box 2 passes through test pump input sensor 3 and test hydraulic pump 6. connected to the input shaft. A hydraulic pipeline is arranged between the output oil port of the test hydraulic pump 6 and the P port of the electromagnetic reversing valve 10, and a loading valve 7, a safety valve 8, and an anti-cavitation check valve 9 are arranged on the hydraulic pipeline. Port A and port B of the electromagnetic reversing valve 10 are connected to two working oil ports of the test hydraulic motor 11 , and port T of the electromagnetic reversing valve 10 is connected to the hydraulic oil tank 4 through the oil filter 5 . The output shaft of the test hydraulic motor 11 is connected to the input shaft of the reversing box 13 through the test motor output sensor 12 , and the output shaft of the reversing box 13 is connected to the input shaft of the gearbox 14 .

On the pipeline of the oil inlet and outlet of the test hydraulic motor 11, a pressure gauge and a flow meter are all arranged; on the pipeline of the oil inlet and outlet of the test hydraulic pump 6, a flow meter is all arranged; A pressure gauge is set on the pipeline; a flow gauge is set on the pipeline leading to the loading valve 7 .

Both the test pump input sensor 3 and the test motor output sensor 12 detect two parameters of the rotational speed and torque of the shaft where they are located.

A kind of test method of the hydraulic pump and the motor test bench that can recover the energy consumption of the test of the utility model comprises:

First, send a signal to the electromagnetic proportional overflow valve 7, set the opening pressure of the electromagnetic proportional overflow valve 7, set the electromagnetic reversing valve 10 to the neutral position, manipulate the reversing box 13 to make the rotation direction of all rotating components match, and operate the gearbox 14 Make the rotational speeds of the test hydraulic pump 6 and the test hydraulic motor 11 match each other, and the displacement of the test hydraulic pump 6 is preset at 0 displacement. Start the prime mover 1, the prime mover 1 transmits the power to the power synthesis box 2, and the output shaft of the power synthesis box 2 transmits the power to the test hydraulic pump 6 through the test pump input sensor 3. At the same time, a part of the power drives the gearbox 14, the reversing box 13, the test motor output sensor 12 and the test hydraulic motor 11 to rotate through the second input shaft end of the power synthesis box 2. Since the electromagnetic reversing valve 10 is in the neutral position, the displacement of the test hydraulic pump 6 is 0, and the system is in the no-load state.

Manipulate the electromagnetic reversing valve 10 according to the rotation direction of the test hydraulic motor 11, and slowly increase the displacement of the test hydraulic pump 6 so that the hydraulic oil enters the test hydraulic motor 11 according to the actual rotation direction of the test hydraulic motor 11. At this time, under the pressure of the hydraulic oil Next, the test hydraulic motor 11 will drive the second input shaft end of the power synthesis box 2 through the test motor output sensor 12, the reversing box 13, and the gearbox 14, and then drive the test hydraulic pump 6 to rotate from the output shaft end of the power synthesis box 2 , to achieve energy recovery.

Due to various energy losses, the driving power of the test hydraulic motor 11 must be less than the power required to drive the test hydraulic pump 6, and the lack of power is compensated by the prime mover 1 through the gears in the power synthesis box 2.

Adjust the displacement of the test hydraulic pump 6. Under the condition that the oil discharge pressure of the test hydraulic pump 6 is stable at the set pressure of the electromagnetic proportional relief valve 7, the hydraulic oil flow discharged from the electromagnetic proportional relief valve 7 can be realized as much as possible. less, which can improve the energy saving effect.

If due to various reasons during the commissioning process, if the hydraulic oil flow rate discharged by the test hydraulic pump 6 is less than the hydraulic oil flow rate required for the test hydraulic motor 11 to rotate, the oil outlet from the test hydraulic pump 6 to the test hydraulic motor 11 Negative pressure can occur in the hydraulic oil in the hydraulic line between the oil inlets, that is, there is a void phenomenon. At this time, the anti-cavitation check valve 9 is connected to replenish the hydraulic oil in the hydraulic line to prevent voiding.

Changing the set pressure of the electromagnetic proportional overflow valve 7 can change the test load; changing the speed of the prime mover 1 can change the test speed of the equipment.

According to the data of the test pump input sensor 3, the test motor output sensor 12, the pressure gauge and the flow meter in Fig. 1, the relevant performance indicators of the test hydraulic pump 6 and the test hydraulic motor 11 can be analyzed and obtained.

If will test the performance of test hydraulic motor 11 another rotation direction, as long as change the direction of reversing box 13 output shafts before test work starts, test is carried out to another electromagnet energization of electromagnetic reversing valve 10 and gets final product.

The first embodiment is more convenient for testing the performance of the hydraulic motor.

2nd embodiment

See also shown in Fig. 2, compared with the first embodiment, the prime mover 1 of the second embodiment is a DC speed regulating motor, the test hydraulic pump 6 is a two-way variable pump, the loading valve 7 is a throttle valve, and the reversing valve 10 is a The manual reversing valve, the test hydraulic motor 11 are two-way variable motors, and the power synthesis box 2 is a chain drive; the rectification valve block 15 is added, and the rectification valve block 15 is a bridge rectification valve block, which is composed of four rectification one-way valves. The two oil ports of the test hydraulic pump 6 are connected to the alternating oil port of the rectification valve block 15 through the pipeline, and the oil outlet of the rectification valve block 15 is connected to the P port of the reversing valve 10 through the pipeline connection, and the rectification valve block 15 The oil inlet is connected with the hydraulic oil tank 4 through the oil filter 5.

Under the condition that the displacement of the test hydraulic motor 11 is determined, adjusting the displacement of the variable test hydraulic pump 6 can make the loading valve 7 work in a steady state; under the condition that the displacement of the test hydraulic pump 6 is determined, the variable test can be adjusted The displacement of the hydraulic motor 11 can also make the loading valve 7 work in a stable state; since the rectifying valve block 15 is provided, the test can be carried out under the condition that the oil inlet and outlet of the test hydraulic pump 6 are reversed.

Other test principles are the same as those of the first embodiment.

The adjustment range of the second embodiment is larger than that of the first embodiment, and various hydraulic pumps and hydraulic motors can be tested.

Claims (6)

1. A hydraulic pump and a motor test bench that can recover test energy consumption are characterized in that it comprises prime mover (1), power synthesis box (2), test pump input sensor (3), hydraulic oil tank (4), test Hydraulic pump (6), loading valve (7), reversing valve (10), test hydraulic motor (11), test motor output sensor (12), reversing box (13) and gearbox (14); power synthesis box (2) There are two input shaft ends and one output shaft end; the first input shaft end of the power synthesis box (2) is connected with the output shaft of the prime mover (1), and the second input shaft end is connected with the gearbox (14) The output shaft of the power synthesis box (2) is connected to the input shaft of the test hydraulic pump (6) through the test pump input sensor (3); the output oil port of the test hydraulic pump (6) is connected through a hydraulic pipeline The reversing valve (10) is provided with a loading valve (7) on the hydraulic pipeline; A port and B port of the reversing valve (10) are connected with two working oil ports of the test hydraulic motor (11); The output shaft of motor (11) connects the input shaft of reversing box (13) through test motor output sensor (12), and the output shaft of reversing box (13) connects the input shaft of gearbox (14). 2. A kind of hydraulic pump and motor test bench that can recover test energy consumption according to claim 1 is characterized in that, the hydraulic pipeline is also provided with a safety valve (8) and an anti-cavitation check valve (9 ). 3. A kind of hydraulic pump and motor test bench that can recover test energy consumption according to claim 1 is characterized in that, the prime mover (1) is a speed-regulating motor, and the power synthesis box (2) is a gear In the transmission type power synthesis box, the loading valve (7) is an electromagnetic proportional overflow valve, and the reversing valve (10) is an electromagnetic reversing valve. 4. A kind of hydraulic pump and motor test bench that can recover test energy consumption according to claim 1 is characterized in that, between the output oil port of the test hydraulic pump (6) and the P port of the reversing valve (10) A hydraulic pipeline is arranged; A port and B port of the reversing valve (10) are connected to the two working oil ports of the test hydraulic motor (11), and the T port of the reversing valve (10) is connected to the hydraulic pressure through the oil filter (5). Fuel tank (4). 5. A kind of hydraulic pump and motor test bench that can recover test energy consumption according to claim 1, is characterized in that, the test pump input sensor (3) and the test motor output sensor (12) are used to detect the position of the shaft where it is located. speed and torque. 6. A kind of hydraulic pump and motor test bench that can recover test energy consumption according to claim 3 is characterized in that, the prime mover (1) is an AC variable frequency speed regulating motor, an AC electromagnetic speed regulating motor or a DC speed regulating motor. speed motor, the power synthesis box (2) is a chain-driven power synthesis box, the loading valve (7) is a throttle valve, the reversing valve (10) is a manual reversing valve, and the test hydraulic pump (6) is a two-way variable pump, and the test hydraulic motor (11) is a two-way variable motor; the two oil ports of the two-way variable pump are connected to the two alternating oil ports of the rectification valve block (15) through pipelines, and the rectification valve block The oil outlet of (15) is connected with the P port of the reversing valve (10) through the pipeline connection, and the oil inlet of the rectifier valve block (15) is connected with the hydraulic oil tank (4) through the oil filter (5); The rectification valve block (15) is a bridge rectification valve block composed of four rectification check valves.