Motor stalling testing device

Abstract

The utility model provides a motor locked-rotor testing device. The motor locked-rotor testing device comprises a rack, a brake disc, a testing mechanism, a locking execution mechanism and a dynamometer. The brake disc is rotationally arranged on the rack and is connected with the test end of the dynamometer; one end of the testing mechanism is connected with the brake disc, the other end is connected with the power output end of the tested motor, and the testing mechanism is used for testing the rotating speed and / or torque of the power output end; the locking executing mechanism comprises a hydraulic oil supply system and locking assemblies arranged on the two sides of the brake disc respectively. Each locking assembly comprises a hydraulic cylinder and an execution disc connected with the hydraulic cylinder, and the hydraulic oil supply system is connected with the hydraulic cylinders on the two sides and can drive the execution discs on the two sides to be close to and abut against the brake disc. According to the motor locked-rotor testing device provided by the utility model, when a locked-rotor test is carried out, the brake disc can be firmly clamped by utilizing the characteristic that the contact area of surface contact between the execution disc and the brake disc is relatively large, so that the testing precision can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor testing, and particularly relates to a motor locked-rotor testing device. Background Art

[0002] Currently, the power form in new energy vehicles mainly relies on motor drive. The working environment of the motors in new energy vehicles is complex, and the motors need to be systematically tested before being applied to the whole vehicle. Among them, in the motor testing, the locked-rotor characteristic of the motor is one of the key performance assessment indicators of the electric drive system.

[0003] For the motor locked-rotor test, currently, it is mainly achieved by integrating a jaw-type mechanical locking mechanism on the test bench. That is, a plurality of locking grooves are circumferentially arranged at intervals on the brake disc, and the locked-rotor test of the motor is realized through the locking cooperation between the brake block and one of the locking grooves. This structural method cannot achieve the locked-rotor test at any angle. Moreover, with the development of multiple locked-rotor tests, the brake disc and the brake block are worn and deformed, resulting in low test accuracy. Even, the brake disc and the brake block are prone to jamming, which affects the development of the test. Content of the Utility Model

[0004] In view of this, the utility model aims to provide a motor locked-rotor testing device to improve the test accuracy.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A motor locked-rotor testing device includes a bench, a brake disc, a testing mechanism, a locking execution mechanism and a dynamometer arranged on the bench;

[0007] The brake disc is rotatably arranged on the bench, and the brake disc is connected to the testing end of the dynamometer;

[0008] One end of the testing mechanism is connected to the brake disc, and the other end is used for connecting the power output end of the motor to be tested. The testing mechanism is used to test the rotational speed and / or torque of the power output end;

[0009] The locking execution mechanism includes a hydraulic oil supply system and locking components respectively arranged on both sides of the brake disc; each locking component includes a hydraulic cylinder and an execution disc connected to the power output end of the hydraulic cylinder. The hydraulic oil supply system is respectively connected to the hydraulic cylinders on both sides, and can drive the execution discs on both sides to respectively approach and tightly press against the brake disc.

[0010] Further, the hydraulic oil supply system includes branch pipelines respectively connected to the hydraulic cylinders on both sides, a main pipeline that parallels the two branch pipelines together, and an oil tank connected to the end of the main pipeline far from the branch pipelines. An electromagnetic directional valve is arranged on the main pipeline.

[0011] Further, a bypass pipeline is connected between the main pipeline and the fuel tank, and a pressure relief valve is provided on the bypass pipeline.

[0012] Further, a pressure detection mechanism is provided on the main pipeline, and the pressure detection mechanism is used to detect the hydraulic pressure of the oil in the main pipeline.

[0013] Further, a control device is further included. The control device is electrically connected to the pressure detection mechanism, the hydraulic pump driving device of the hydraulic pump, and the electromagnetic directional valve respectively. The pressure detection mechanism is used to transmit the measured hydraulic pressure of the oil in the main pipeline to the control device. The control device is used to control the start and stop of the hydraulic pump driving device and the switching of the electromagnetic directional valve between each working position.

[0014] Further, the control device is electrically connected to the test mechanism and the dynamometer respectively. The test mechanism is used to transmit the measured rotational speed and / or torque to the control device, and the dynamometer is used to transmit the measured output power to the control device. The control device uses a host computer, and the host computer includes any one of a computer, a tablet, and a mobile phone.

[0015] Further, the test mechanism uses a rotational speed and torque measuring instrument. Both ends of the rotational speed and torque measuring instrument are respectively connected with a first connecting piece and a second connecting piece through flanges. The first connecting piece is connected to the brake disc through bolts, and the second connecting piece is connected to the power output end of the motor under test through splines; and / or,

[0016] The electromagnetic directional valve uses a three-position three-way electromagnetic directional valve electrically connected to the control device.

[0017] Further, on the side opposite to the side connecting the first connecting piece, a rotating shaft is connected to the other side of the brake disc, and the rotating shaft is rotatably arranged on the bench through a bearing;

[0018] At the end of the rotating shaft connected to the brake disc, the other end of the rotating shaft is connected to the test end of the dynamometer.

[0019] Further, a return mechanism is further included. The return mechanism corresponds to each actuator disc. Each actuator disc approaches and presses against the brake disc, and the corresponding return mechanism stores energy. Each return mechanism releases energy and can drive the corresponding actuator disc to reset.

[0020] Further, each return mechanism includes a spring. One end of the spring presses against the actuator disc, and the other end presses against the bench.

[0021] Compared with the prior art, the present utility model has the following advantages:

[0022] When the motor locked-rotor test device described in the utility model is used for motor locked-rotor test, the brake disc can be clamped by the actuator discs on both sides, which is convenient for the dynamometer to test the output power, and can test any position in the circumferential direction of the power output end of the motor. Moreover, a set of hydraulic oil supply system is used to drive two hydraulic cylinders to work respectively, which is convenient to control, simple and reliable in structure, low in cost, and utilizes the characteristic that the contact between the two actuator discs and the brake disc is a surface contact with a large contact area, so that the brake disc can be firmly clamped, which is beneficial to improving the test accuracy.

[0023] In addition, the set pipeline includes a main pipeline and two branch pipelines, which is convenient for overall layout and makes the connection of the pipeline with each hydraulic cylinder and the oil tank relatively convenient. An electromagnetic reversing valve is arranged on the main pipeline, which is convenient to control the conduction and cut-off of the main pipeline, and is convenient for synchronous control of the two hydraulic cylinders. The setting of the bypass pipeline and the pressure relief valve can discharge the oil in time through the pressure relief valve to release the pressure when the oil pressure in the main pipeline is too high, so as to prevent the damage of components caused by excessive pressure.

[0024] Secondly, the set pressure detection mechanism is convenient for real-time monitoring of the oil pressure in the main pipeline, and by monitoring the oil pressure in the main pipeline, it is beneficial to master the working state of the locking actuator mechanism. The set control device is electrically connected to the pressure detection mechanism, the hydraulic pump drive device of the hydraulic pump and the electromagnetic reversing valve respectively. According to the pressure detected by the pressure detection mechanism, the control device can start and stop the hydraulic pump drive device, and can also control the electromagnetic reversing valve to switch between each working position, which is convenient for realizing automatic control and is beneficial to improving the test convenience and test speed.

[0025] Furthermore, the control device is electrically connected to the test mechanism and the dynamometer respectively, which is convenient for timely obtaining the measurement results of the test mechanism and the dynamometer. The test mechanism adopts a rotational speed and torque measuring instrument, which can measure the rotational speed and torque at the same time. The first connecting piece and the second connecting piece are set, which is convenient for connecting with the brake disc and the power output end of the motor to be tested. The second connecting piece is connected to the power output end of the motor to be tested through a spline, which is convenient for installation and disassembly.

[0026] In addition, the setting of the rotating shaft can conveniently connect the brake disc and the test end of the dynamometer. The rotating shaft is rotatably arranged on the bench through bearings, which can reduce the rotation resistance of the rotating shaft and is beneficial to improving the measurement accuracy. The set return mechanism can release energy by using the return mechanism when the hydraulic cylinder does not apply the driving force to the actuator disc to clamp the brake disc, and drive the actuator disc to automatically reset. The return mechanism adopts a spring, which can adopt existing standard parts and has a low cost. Description of the Drawings

[0027] The accompanying drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0028] Figure 1 is a schematic structural diagram of the first state of the motor locked-rotor test device according to the embodiment of the present utility model;

[0029] Figure 2 is a schematic structural diagram of the second state of the motor locked-rotor test device according to the embodiment of the present utility model;

[0030] Figure 3 is a schematic structural diagram of the third state of the motor locked-rotor test device according to the embodiment of the present utility model;

[0031] Description of reference numerals:

[0032] 1. Brake disc; 2. Testing mechanism; 3. Motor under test; 4. Dynamometer; 5. Hydraulic cylinder; 51. Execution disc; 6. Electromagnetic directional valve; 7. Pressure detection mechanism; 8. Hydraulic pump; 9. Pressure relief valve; 11. Bearing; 12. Return mechanism; 13. Control device; 41. Rotating shaft; 10. Branch pipeline; 20. Main pipeline; 30. Bypass pipeline; 100. Oil tank. Detailed implementation manners

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "back", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connection member" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0036] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] This embodiment relates to a motor locked-rotor test device, which is conducive to improving the test accuracy.

[0038] In terms of the overall composition, as Figures 1 to 3 shown, the motor locked-rotor test device of this embodiment includes a bench, and a brake disc 1, a test mechanism 2, a locking actuator, and a dynamometer 4 provided on the bench. Among them, the brake disc 1 is rotatably provided on the bench, and the brake disc 1 is connected to the test end of the dynamometer 4. One end of the test mechanism 2 is connected to the brake disc 1, and the other end is used to connect to the power output end of the motor 3 to be tested. The test mechanism 2 is used to test the rotational speed and / or torque of the power output end. The locking actuator includes a hydraulic oil supply system and locking components disposed on both sides of the brake disc 1; each locking component includes a hydraulic cylinder 5 and an actuator disc 51 connected to the power output end of the hydraulic cylinder 5. The hydraulic oil supply system is respectively connected to the hydraulic cylinders 5 on both sides and can drive the actuator discs 51 on both sides to approach and tightly press against the brake disc 1 respectively.

[0039] At this time, in the above structure, when performing the motor locked-rotor test, the brake disc 1 is clamped by the actuator discs 51 on both sides, which is convenient for the dynamometer 4 to test the output power, and the test can be performed at any position in the circumferential direction of the power output end of the motor. Moreover, by using a set of hydraulic oil supply systems to drive the two hydraulic cylinders 5 to work respectively, the control is convenient, the structure is simple and reliable, the cost is low, and the surface contact between the two actuator discs 51 and the brake disc 1 has the characteristic of a large contact area, so the brake disc 1 can be firmly clamped, which is conducive to improving the test accuracy.

[0040] Based on the above overall structure, specifically, as a preferred embodiment, referring to Figure 1 and Figure 3 shown, in this embodiment, a rotatable brake disc 1, a test mechanism 2, a locking actuator, and a dynamometer 4 are provided on the bench. Among them, preferably, the test mechanism 2 of this embodiment uses a rotational speed and torque measuring instrument, which can measure both the rotational speed and torque of the power output end of the motor. Specifically, both ends of the rotational speed and torque measuring instrument are respectively connected with a first connecting piece and a second connecting piece through flanges. The first connecting piece is connected to the brake disc 1 through bolts, and the second connecting piece is connected to the power output end of the motor 3 to be tested through splines.

[0041] In this embodiment, by setting the test mechanism 2 to use a rotational speed and torque measuring instrument, the rotational speed and torque can be measured simultaneously. The setting of the first connecting piece and the second connecting piece can facilitate the connection with the brake disc 1 and the power output end of the motor 3 to be tested. Moreover, the second connecting piece is connected to the power output end of the motor 3 to be tested through splines, which is convenient for installation and disassembly and the connection is firm and reliable.

[0042] It should be noted that, in addition to using a rotational speed and torque measuring instrument, the test mechanism 2 in this embodiment can also be a device that only measures rotational speed or a device that only measures torque, and this is also feasible.

[0043] Still referring to Figures 1 to 3 As shown, in this embodiment, the brake disc 1 is rotatably arranged on the test bench, and the brake disc 1 is connected to the test end of the dynamometer 4. Specifically, a rotatable rotating shaft 41 is provided on the test bench. One end of the rotating shaft 41 is fixedly connected to the brake disc 1, and the other end of the rotating shaft 41 is connected to the test end of the dynamometer 4. Preferably, the rotating shaft 41 and the test end of the dynamometer 4 can be connected by a flat key.

[0044] Both ends of the rotational speed and torque measuring instrument are respectively connected to the first connecting member and the second connecting member through flanges. The first connecting member is fixedly connected to the brake disc 1. Preferably, the first connecting member can be fixedly connected to the brake disc 1 by bolts. The second connecting member is connected to the output shaft of the test piece, that is, the tested motor, and preferably, it is connected by a spline. In addition, it is also possible to use a bolt connection.

[0045] Moreover, in this embodiment, the rotating shaft 41 is rotatably arranged on the test bench through a bearing 11. At this time, the setting of the rotating shaft 41 can facilitate the connection between the brake disc 1 and the test end of the dynamometer 4. By making the rotating shaft 41 rotatably arranged on the test bench through the bearing 11, the rotational resistance of the rotating shaft 41 can be reduced, which is beneficial to improving the measurement accuracy.

[0046] The locking execution mechanism in this embodiment includes a hydraulic oil supply system and locking components arranged on both sides of the brake disc 1. Among them, preferably, the locking components on both sides are symmetrically arranged with respect to the brake disc 1, so that when the brake disc 1 is locked, the braking of the brake disc 1 is more stable. Still referring to Figures 1 to 3 As shown, each locking component includes a hydraulic cylinder 5 and an execution disc 51 connected to the power output end of the hydraulic cylinder 5. The hydraulic oil supply system is respectively connected to the hydraulic cylinders 5 on both sides and can drive the execution discs 51 on both sides to approach and abut against the brake disc 1 respectively.

[0047] Specifically in terms of structure, the hydraulic oil supply system includes branch pipelines 10 respectively connected to the hydraulic cylinders 5 on both sides, a main pipeline 20 that combines the two branch pipelines 10 in parallel, and a fuel tank 100 connected to the end of the main pipeline 20 away from the branch pipelines 10. Among them, a hydraulic pump 8 and an electromagnetic directional control valve 6 are provided on the main pipeline 20. In addition, the hydraulic cylinder 5 in this embodiment is preferably a single-cylinder hydraulic cylinder 5, which has a simple structure and low cost. The setting of the main pipeline 20 and the two branch pipelines 10 can facilitate the overall layout of the structure, and make the connection of the pipelines to each hydraulic cylinder 5 and the fuel tank 100 relatively convenient. The electromagnetic directional control valve 6 is provided on the main pipeline to facilitate the control of the conduction and cut-off of the main pipeline 20, and thus facilitate the synchronous control of the two hydraulic cylinders 5.

[0048] In some embodiments, preferably, in this embodiment, a bypass pipeline 30 is connected between the main pipeline 20 and the fuel tank 100, and a pressure relief valve 9 is provided on the bypass pipeline 30. The setting of the pressure relief valve 9 can timely discharge the oil fluid through the pressure relief valve 9 to release the pressure when the oil fluid pressure in the main pipeline 20 is too high, thereby preventing component damage or system failure caused by excessive pressure.

[0049] To facilitate real-time monitoring of the oil fluid pressure in the main pipeline 20, in this embodiment, a pressure detection mechanism 7 is also provided on the main pipeline 20, and the pressure detection mechanism 7 is used to detect the oil fluid pressure in the main pipeline 20. Specifically in implementation, the pressure detection mechanism 7 can adopt a pressure sensor, for example. Monitoring the oil fluid pressure in the main pipeline 20 through the pressure detection mechanism 7 is beneficial to grasping the working state of the locking actuator.

[0050] In addition, the motor stall test device of this embodiment further includes a control device 13, and the control device 13 is electrically connected to the pressure detection mechanism 7, the hydraulic pump drive device of the hydraulic pump 8, and the electromagnetic reversing valve 6 respectively. Among them, the pressure detection mechanism 7 is used to transmit the measured oil fluid pressure in the main pipeline 20 to the control device 13, and the control device 13 is used to control the start and stop of the hydraulic pump drive device and the switching of the electromagnetic reversing valve 6 between each working position.

[0051] By electrically connecting the control device 13 to the pressure detection mechanism 7, the hydraulic pump drive device of the hydraulic pump 8, and the electromagnetic reversing valve 6 respectively, thus, according to the pressure detected by the pressure detection mechanism 7, the control device 13 can start and stop the hydraulic pump drive device, and can also control the switching of the electromagnetic reversing valve 6 between each working position, which is convenient to realize automatic control and is beneficial to improving the convenience and test rate of the test.

[0052] Moreover, the control device 13 of this embodiment is also electrically connected to the test mechanism 2 and the dynamometer 4 respectively, that is, the control device 13 is also electrically connected to the rotational speed torque measuring instrument and the dynamometer 4 respectively, so as to facilitate timely obtaining the measurement results of the test mechanism 2 and the dynamometer 4. Among them, the test mechanism 2 is used to transmit the measured rotational speed and / or torque to the control device 13, and the dynamometer 4 is used to transmit the measured output power to the control device 13. And, preferably, the control device 13 adopts a host computer, and the host computer includes any one of a computer, a tablet, and a mobile phone.

[0053] It should be noted that the electromagnetic reversing valve 6 of this embodiment preferably adopts a three-position three-way electromagnetic reversing valve 6 electrically connected to the control device 13. Specifically in implementation, the oil return port of the three-position three-way electromagnetic reversing valve 6 is communicated with the fuel tank 100 through an oil return pipeline, the oil inlet is connected to the oil outlet of the hydraulic pump 8, and one working port can be connected to two hydraulic cylinders 5.

[0054] Specifically, in this embodiment, the control device 13 is connected to the speed torque measuring instrument, the dynamometer 4, the pressure sensor, the electromagnetic reversing valve 6, and the hydraulic pump driving device respectively. During the actual test, the dynamometer 4 can transmit the measured output power to the control device 13, and the pressure sensor can transmit the measured pressure to the control device 13, and the speed torque measuring instrument can transmit the measured speed and torque to the control device 13.

[0055] According to the pressure information transmitted by the pressure sensor, the control device 13 controls the start and stop of the hydraulic pump drive device, and the control device 13 also controls the three-position three-way electromagnetic reversing valve 6 to switch between the first working position, the second working position and the third working position. Figure 1 In the locked state shown in , the oil supply pipeline is connected, and under the driving action of the hydraulic pump 8, the oil tank 100 supplies oil to the hydraulic cylinder 5, so that the actuator disc 51 connected to the hydraulic cylinder 5 approaches the brake disc 1 and applies a clamping force to the brake disc 1.

[0056] When the pressure detection mechanism 7 detects that the pressure of the main line 20 reaches the preset threshold, the control device 13 controls the electromagnetic reversing valve 6 to switch from the first working position to the second working position, wherein the second working position is also the valve core is in the middle working position, such as Figure 2 In the state shown, the actuator disc 51 can be kept in the state of locking the brake disc 1. In the second working position, the oil in the outlet pipeline of the hydraulic pump 8 directly flows back to the oil tank 100. Part of the main pipeline 20 and the two branch pipelines 10 at the working oil port of the electromagnetic reversing valve 6 are in a sealed state, that is, the two hydraulic cylinders 5 are kept in the working state of maintaining pressure, and under the action of the hydraulic oil, the actuator disc 51 is continuously kept in the state of locking the brake disc 1.

[0057] During the test, when the pressure detection mechanism 7 detects that the pressure of the main line 20 is less than the preset threshold, the control device 13 controls the electromagnetic reversing valve 6 to switch to the first working position, and the hydraulic pump 8 supplies oil to the hydraulic cylinder 5 to increase the oil pressure of the main line 20. When the pressure detection mechanism 7 detects that the pressure of the main line 20 reaches the preset threshold, the electromagnetic reversing valve 6 switches to the second working position until the test is completed.

[0058] After the test is completed, the control device 13 controls the electromagnetic reversing valve 6 to switch to the third working position, that is, when the valve core is in the right working position, at this time, part of the main line 20 at the working oil port of the electromagnetic reversing valve 6 and the oil in the two branch lines 10 flow back to the oil tank 100, and the power output end of the hydraulic cylinder 5 drives the actuator disc 51 to move away from the brake disc 1, thereby releasing the lock on the brake disc 1.

[0059] In addition, the motor locked-rotor test device of this embodiment further includes a return mechanism 12, which corresponds to each actuator disk 51 one by one. Each actuator disk 51 approaches and presses against the brake disk 1, and the corresponding return mechanism 12 stores energy. When each return mechanism 12 releases energy, it can drive the corresponding actuator disk 51 to reset. At this time, with the setting of the return mechanism 12, when the hydraulic cylinder 5 does not apply the driving force to press against the brake disk 1 on the actuator disk 51, the return mechanism 12 releases energy and can drive the actuator disk 51 to automatically reset.

[0060] As a preferred embodiment, each return mechanism 12 includes a spring. One end of the spring presses against the actuator disk 51, and the other end presses against the bench. Specifically, during implementation, a fixing plate or a fixing block is fixedly installed on the bench. One end of the spring presses against the fixing plate or the fixing block, and the other end presses against one side of the actuator disk 51. In this embodiment, each return mechanism 12 uses a spring, which has a simple structure, is convenient for layout and implementation, can use existing standard parts, has a low cost, and can realize the independent return of each actuator disk 51.

[0061] The motor locked-rotor test device of this embodiment drives two hydraulic cylinders 5 to work respectively through a set of hydraulic oil supply system, which is convenient to control, has a simple and reliable structure, low cost, and when performing the locked-rotor test, taking advantage of the characteristic that the contact area between the actuator disk 51 and the brake disk 1 is relatively large in surface contact, it can firmly clamp the brake disk 1, and can perform the locked-rotor test on the motor drive shaft in a locked state at any angle, thus being beneficial to improving the test accuracy and working efficiency, and having a good use effect.

[0062] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A motor locked-rotor test device, characterized in that: It includes a bench, a brake disc (1), a test mechanism (2), a locking actuator and a dynamometer (4) provided on the bench; The brake disc (1) is rotatably arranged on the bench, and the brake disc (1) is connected to the test end of the dynamometer (4); One end of the test mechanism (2) is connected to the brake disc (1), and the other end is used to connect to the power output end of the motor (3) to be tested. The test mechanism (2) is used to test the rotational speed and / or torque of the power output end; The locking actuator includes a hydraulic oil supply system and locking components disposed on both sides of the brake disc (1); each locking component includes a hydraulic cylinder (5) and an actuator disc (51) connected to the power output end of the hydraulic cylinder (5). The hydraulic oil supply system is respectively connected to the hydraulic cylinders (5) on both sides and can drive the actuator discs (51) on both sides to approach and tightly press against the brake disc (1) respectively.

2. The motor locked-rotor test device according to claim 1, characterized in that: The hydraulic oil supply system includes branch pipelines (10) respectively connected to the hydraulic cylinders (5) on both sides, a main pipeline (20) that combines the two branch pipelines (10) in parallel, and a fuel tank (100) connected to one end of the main pipeline (20) away from the branch pipelines (10). A hydraulic pump (8) and an electromagnetic directional valve (6) are provided on the main pipeline (20).

3. The motor locked-rotor test device according to claim 2, characterized in that: A bypass pipeline (30) is connected between the main pipeline (20) and the fuel tank (100), and a pressure relief valve (9) is provided on the bypass pipeline (30).

4. The motor locked-rotor test device according to claim 2, characterized in that: A pressure detection mechanism (7) is provided on the main pipeline (20), and the pressure detection mechanism (7) is used to detect the oil pressure in the main pipeline (20).

5. The motor locked-rotor test device according to claim 4, characterized in that: It further includes a control device (13), and the control device (13) is electrically connected to the pressure detection mechanism (7), the hydraulic pump drive device of the hydraulic pump (8) and the electromagnetic directional valve (6) respectively; The pressure detection mechanism (7) is used to transmit the measured oil pressure in the main pipeline (20) to the control device (13), and the control device (13) is used to control the start and stop of the hydraulic pump drive device and the switching of the electromagnetic directional valve (6) between each working position.

6. The motor locked-rotor test device according to claim 5, characterized in that: The control device (13) is electrically connected to the test mechanism (2) and the dynamometer (4) respectively. The test mechanism (2) is used to transmit the measured rotational speed and / or torque to the control device (13), and the dynamometer (4) is used to transmit the measured output power to the control device (13); The control device (13) uses an upper computer, and the upper computer includes any one of a computer, a tablet and a mobile phone.

7. The motor locked-rotor test device according to claim 6, wherein: The test mechanism (2) uses a rotational speed and torque measuring instrument. Both ends of the rotational speed and torque measuring instrument are respectively connected with a first connecting piece and a second connecting piece through flanges. The first connecting piece is connected with the brake disc (1) through bolts, and the second connecting piece is connected with the power output end of the motor under test (3) through splines; and / or, The electromagnetic reversing valve (6) uses a three-position three-way electromagnetic reversing valve (6) electrically connected to the control device (13).

8. The motor locked-rotor test device according to claim 7, wherein: On the side opposite to the side connecting the first connecting piece, the other side of the brake disc (1) is connected with a rotating shaft (41). The rotating shaft (41) is rotatably arranged on the bench through a bearing (11); On the end of the rotating shaft (41) connected to the brake disc (1) opposite to the rotating shaft (41), the other end of the rotating shaft (41) is connected with the test end of the dynamometer (4).

9. The motor locked-rotor test device according to any one of claims 1-8, wherein: It further includes a return mechanism (12). The return mechanism (12) corresponds to each execution disc (51). Each execution disc (51) approaches and abuts against the brake disc (1), and the corresponding return mechanism (12) stores energy. Each return mechanism (12) releases energy and can drive the corresponding execution disc (51) to reset.

10. The motor locked-rotor test device according to claim 9, wherein: Each return mechanism (12) includes a spring. One end of the spring abuts against the execution disc (51), and the other end abuts against the bench.

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