CN210198693U

CN210198693U - EPS no-load test and sensor calibration machine

Info

Publication number: CN210198693U
Application number: CN201921079233.XU
Authority: CN
Inventors: Xufeng Dong; 董旭锋; Yulong Li; 李玉龙; Dongyang Li; 李东洋; Jinglin Li; 李景林
Original assignee: Jilin Rui Ming Mechanical & Electronic Equipment Corp Ltd
Current assignee: Jilin Rui Ming Mechanical & Electronic Equipment Corp Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-03-27
Anticipated expiration: 2029-07-11

Abstract

The utility model relates to an EPS no-load test and sensor calibration machine, which comprises a touch screen controller, an electric cabinet, a frame, an experiment unit, a positioning clamp and a locking mechanism; the rack comprises an experiment platform rack and a control rack; the electric cabinet is electrically connected with the touch screen controller; the experiment unit comprises a supporting seat and a performance detection experiment instrument vertically arranged on the supporting seat; the supporting seat, the positioning clamp and the locking machine are arranged on the experimental platform frame at one time; the utility model has the advantages that: the EPS system detection method is suitable for carrying and detecting the EPS system, and detection items are comprehensive. The automatic locking of the loaded EPS system can be realized through the locking device, the input end and the output end of the EPS system can be automatically fixedly connected through the experiment instrument and the limiting mechanism, the integral matching and connecting automation degree is high, the efficiency of flow detection operation is improved, and the loading matching and connecting reliability of the EPS system is ensured; each unit has a degree of freedom adjustment, and the carrying and detection of different EPS systems are met.

Description

EPS no-load test and sensor calibration machine

Technical Field

The invention relates to the technical field of mechanical equipment detection, in particular to an EPS (electric power storage) no-load test and sensor calibration machine.

Background

An Electric Power Steering (EPS) is a power steering experimental instrument directly relying on a motor to provide an auxiliary torque, and has many advantages compared with a conventional hps (hydraulic powersteering). The EPS is mainly composed of a torque sensor, a vehicle speed sensor, a motor, a reduction mechanism, an Electronic Control Unit (ECU), and the like.

The working stability and the operating characteristics of the electric power steering system are related to the driving safety and the performance of the whole vehicle, so that the operations of effectively detecting various performances of a steering gear, calibrating a torque sensor and the like are required.

But the overall stability of the existing detection equipment is poor, the rapid model change of different products cannot be met, the automation degree is low, and the operation efficiency is low.

Disclosure of Invention

In view of the above, the invention provides the EPS no-load test and sensor calibration machine which has the advantages of good stability, high automation degree and high operation efficiency, and can meet the requirement of fast replacement of different products.

In order to achieve the purpose, the EPS no-load test and sensor calibration machine adopts the following technical scheme, and comprises a touch screen controller, an electric cabinet, a rack, an experiment unit, a positioning clamp and a locking mechanism;

the rack comprises an experiment platform rack and a control rack, and the control rack is fixed on the upper part of the experiment platform rack;

the touch screen controller is fixed on one side of the control rack;

the electric control box is electrically connected with the touch screen controller and is fixed on the other side of the control rack;

the experimental unit comprises a supporting seat and a performance detection experimental instrument vertically arranged on the supporting seat; the supporting seat is fixed on the experiment platform frame and is positioned in the control rack; the performance detection experiment instrument is electrically connected with the electric cabinet;

the positioning clamp comprises a clamp quick-change plate and a positioning clamp which is vertically arranged on the clamp quick-change plate and used for fixing a workpiece; the fixture quick-change plate is fixed on the supporting seat, and the positioning clamp is electrically connected with the electric cabinet; a through hole is formed in the positions of the clamp quick-change plate and the support seat, which correspond to the axis of the performance detection experiment instrument;

the locking mechanism comprises a fixed frame and a locking device which is vertically arranged on the fixed frame and used for locking the workpiece; the fixing frame is fixed below the supporting seat, a floating head is arranged on the locking device, and the floating head is arranged in the through hole.

The invention can place the experimental equipment to be detected on the invention through the experimental unit, the positioning fixture and the locking mechanism, is suitable for carrying and detecting the EPS system, and has more comprehensive detection items. The invention adopts the floating head, and can avoid damaging the spline when being connected with a tested product; the spline head of the equipment adopts a quick-change design of a quick-change plate of a clamp, so that the quick-change of different products can be met; the touch screen is used as a manual interface, so that the operation is simplified, and meanwhile, the setting of operation data is more flexible, and the test requirements of different products can be met. The lower half part of the equipment rack is welded in a frame mode, and the stability of the equipment in the test process is guaranteed. The upper half part of the rack adopts a section bar supporting structure, so that the appearance is attractive, the whole weight of the equipment is reduced, the integral matching automation degree is high, the efficiency of flow detection operation is improved, and the reliability of loading matching of the EPS system is ensured. Each unit has a degree of freedom adjustment, and the carrying and detection of different EPS systems are met.

Furthermore, the performance detection experiment instrument comprises an experiment instrument and a moving mechanism for driving the experiment instrument to move up and down in the vertical direction;

a ball screw is vertically fixed on the supporting seat, and the moving mechanism is connected to the ball screw in a sliding manner;

the experimental instrument comprises a power device, and a rotating shaft, a torque sensor, a transition shaft, a universal joint and an extension head which are sequentially connected with the power output end of the power device from top to bottom;

the rotating shaft, the torque sensor, the transition shaft, the universal joint and the extension head are all fixed on the moving mechanism through a fixing frame.

Further, the moving mechanism includes a moving mechanism,

the upper guide rail and the lower guide rail are vertically arranged on the ball screw;

the moving plate is connected with the upper guide rail and the lower guide rail in a sliding manner;

the motor mounting plate is fixed on the ball screw and is positioned on the corresponding surface of the moving plate;

the upper servo motor and the lower servo motor are fixed at the lower end of the motor mounting plate, the power output end of the upper servo motor and the lower servo motor extends to the upper end of the motor mounting plate, and the upper servo motor and the lower servo motor are electrically connected with the electric cabinet;

the synchronous belt wheel II is connected with the power output ends of the upper servo motor and the lower servo motor;

the synchronous pulley I is arranged between the moving plate and the supporting seat and is in transmission connection with the synchronous pulley II through a synchronous belt;

and one end of the ball screw is fixedly connected with the lower end of the synchronous pulley I, and the other end of the ball screw is in transmission connection with the moving plate.

Still include motor tensioning board, motor tensioning board is located the motor mounting panel with between the servo motor from top to bottom, just motor tensioning board with servo motor fixed connection from top to bottom, with the connection can be dismantled to motor tensioning board.

Further, the power device comprises

The rotating shaft supporting frame is fixed on the moving plate and is positioned at the upper end of the moving plate;

the torque servo motor is fixed on the rotating shaft supporting frame and is electrically connected with the electric cabinet;

the synchronous belt wheel III is connected with the output end of the torque servo motor;

the synchronous belt pulley IV is arranged on one side of the synchronous belt pulley III and is identical in height, and the synchronous belt pulley IV is in transmission connection with the synchronous belt pulley III through a synchronous belt.

Furthermore, the device also comprises a limiting device, wherein the limiting device comprises a fixed clamping jaw arranged around the extending head and a clamping jaw block fixed on the fixed clamping jaw and used for setting the position of the extending head.

Furthermore, the positioning clamp comprises a quick clamp fixing frame, an air cylinder fixing plate, a workpiece supporting column, a quick clamp, a positioning air cylinder and a workpiece supporting piece;

the quick clamp fixing frame is fixed on the clamp quick-change plate; the cylinder fixing plate is used for fixing one side end of the quick clamp fixing frame; the positioning cylinder is fixed on the cylinder fixing plate, the quick clamp is arranged on the quick clamp fixing frame, an opening of the quick clamp is corresponding to the through hole and is in transmission connection with the positioning cylinder, the workpiece supporting column is arranged on the periphery of the through hole and is fixedly connected with the clamp quick-change plate, and the workpiece supporting piece is arranged on one side of the quick clamp and is fixedly connected with the clamp quick-change plate.

By adopting the technical scheme, the quick change design of the spline head of the equipment can be realized through the positioning clamp, and the quick change of different products can be met, so that the test requirements of different products can be met.

Furthermore, the locking device also comprises a locking cylinder, a lifting bottom plate and a floating seat; the shell of the dead locking cylinder is fixed on the fixing frame, the output end of the dead locking cylinder penetrates through the fixing frame and is fixedly connected with the lifting bottom plate, the floating seat is fixed on the lifting bottom plate and is located on the surface opposite to the dead locking cylinder, the floating head is arranged on the floating seat, and the dead locking cylinder is electrically connected with the electric cabinet.

According to the technical scheme, the electric cabinet can be controlled through the touch screen controller to further control the locking cylinder to move up and down, the operating performance is high, the locking cylinder can drive the floating head to move up and down, and the floating head is adopted, so that the spline can be prevented from being damaged when the floating head is connected with a tested product, and the detection damage cannot be caused later.

Furthermore, the locking device further comprises a plurality of guide shafts, the guide shafts are respectively arranged on the side edges of the locking cylinder, one end of each guide shaft is fixedly connected with the lifting bottom plate, and the other end of each guide shaft is arranged on the fixing frame and is in sliding connection with the fixing frame.

By adopting the technical scheme, the guide shaft can be used for stabilizing the dead locking cylinder, so that the dead locking cylinder can stably support the lifting bottom plate to move up and down under the action of the guide shaft, the deviation displacement of the lifting bottom plate, the floating seat and the floating head is prevented, the deviation of monitored equipment is effectively prevented, and the experimental data is inaccurate.

The invention has the beneficial effects that:

1. the EPS system detection method is suitable for carrying and detecting the EPS system, and detection items are comprehensive.

2. The automatic locking of the carried EPS system can be realized through the locking device, the input end and the output end of the EPS system can be automatically fixedly connected through the experiment instrument and the limiting mechanism, the integral matching and connecting automation degree is high, the efficiency of flow detection operation is improved, and meanwhile, the reliability of matching and connecting of the loading of the EPS system is ensured.

3. Each unit has a degree of freedom adjustment, and the carrying and detection of different EPS systems are met.

4. The detection device is highly integrated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of an EPS no-load test and sensor calibration machine of the present invention;

FIG. 2 is a schematic diagram of an experimental unit structure of an EPS no-load test and sensor calibration machine of the present invention;

FIG. 3 is a schematic structural view of a positioning fixture of the EPS no-load test and sensor calibration machine of the present invention;

FIG. 4 is a schematic structural diagram of a locking mechanism of the EPS no-load test and sensor calibration machine of the present invention;

wherein, in the figure: the device comprises a touch screen controller 1, an electric cabinet 2, a rack 3, an experiment platform 31, a control rack 32, an experiment unit 4, a support seat 4-1, a mounting plate 4-01, an upper guide rail 4-2, a lower guide rail 4-3, a moving plate 4-4, an upper servo motor 4-4, a motor tensioning plate 4-5, a motor mounting plate 4-6, a synchronous pulley II 4-7, a synchronous pulley I4-8, a ball screw 4-9, a synchronous pulley III 4-11, a torque servo motor 4-12, a synchronous pulley IV 4-13, a rotating shaft 4-14 and a rotating shaft support frame 4-15. 4-16 is a torque sensor, 4-17 is a transition shaft, 4-18 is a universal joint, 4-19 is a fixing frame, and 4-20 is a fixing clamping jaw. 4-21 are clamping jaw blocks, 4-22 are extension heads, 5 are positioning fixtures, 5-1 are fixture quick-change plates, 5-2 are workpiece support columns, 5-3 are quick clamp fixing frames, 5-4 are quick clamps, 5-5 are cylinder fixing plates, 5-6 are positioning cylinders, 5-7 are workpiece supporting pieces, 6 are locking mechanisms, 6-1 are fixing frames, 6-2 are guide shafts, 6-3 are locking cylinders, 6-4 are lifting bottom plates, 6-5 are floating seats, and 6-6 are floating heads.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature "under," "below," and "beneath" a second feature includes a first feature that is directly under and obliquely below the second feature, or that simply means that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 and 4: the EPS no-load test and sensor calibration machine adopts the following technical scheme, and comprises a touch screen controller 1, an electric cabinet 2, a frame 3, an experiment unit 4, a positioning clamp 5 and a locking mechanism 6;

the rack 3 comprises an experiment platform frame 31 and a control platform frame 32, and the control platform frame 32 is fixed on the upper part of the experiment platform frame 31;

the touch screen controller 1 is fixed on one side of the control rack 32;

the electric cabinet 2 is electrically connected with the touch screen controller 1, and the electric cabinet 2 is fixed on the other side of the control rack 32;

the experiment unit 4 comprises a supporting seat 4-1 and a performance detection experiment instrument vertically arranged on the supporting seat 4-1; the supporting seat 4-1 is fixed on the experiment platform frame 31 and is positioned in the control stand 32; the performance detection experimental instrument 42 is electrically connected with the electric cabinet 2;

the positioning clamp 5 comprises a clamp quick-change plate 5-1 and a positioning clamp which is vertically arranged on the clamp quick-change plate 5-1 and used for fixing a workpiece; the clamp quick-change plate 5-1 is fixed on the supporting seat 4-1, and the positioning clamp is electrically connected with the electric cabinet 2; a through hole is formed in the positions of the clamp quick-change plate 5-1 and the support seat 4-1, which correspond to the axis of the performance detection experiment instrument;

the locking mechanism 6 comprises a fixed frame 6-1 and a locking device which is vertically arranged on the fixed frame 6-1 and used for locking the workpiece; the fixed frame 6-1 is fixed below the supporting seat 4-1, the locking device is provided with a floating head 6-6, and the floating head 6-6 is arranged in the through hole.

As shown in fig. 1, in this embodiment, in order to better show the locking mechanism 6, the locking mechanism 6 is purposely moved to the edge of the whole device for clear view.

In the embodiment, the experimental device to be detected can be placed on the invention through the experimental unit 4, the positioning fixture 5 and the locking mechanism 6, the invention is suitable for carrying and detecting the EPS system, and the detection items are relatively comprehensive. The invention adopts the floating heads 6-6, which can avoid damaging the spline when being connected with the tested product; the spline head of the equipment adopts a quick-change design of a clamp quick-change plate 5-1, so that the quick-change of different products can be met; the touch screen is used as a manual interface, so that the operation is simplified, and meanwhile, the setting of operation data is more flexible, and the test requirements of different products can be met. The lower half part of the equipment rack is welded in a frame mode, and the stability of the equipment in the test process is guaranteed. The upper half part of the rack adopts a section bar supporting structure, so that the appearance is attractive, the whole weight of the equipment is reduced, the integral matching automation degree is high, the efficiency of flow detection operation is improved, and the reliability of loading matching of the EPS system is ensured. Each unit has a degree of freedom adjustment, and the carrying and detection of different EPS systems are met.

In this embodiment, the performance testing experimental instrument includes an experimental instrument and a moving mechanism for driving the experimental instrument to move up and down in a vertical direction;

a ball screw 4-01 is vertically fixed on the supporting seat 4-1, and a moving mechanism is connected to the ball screw 4-01 in a sliding manner;

the experimental instrument comprises a power device, and a rotating shaft 4-14, a torque sensor 4-16, a transition shaft 4-17, a universal joint 4-18 and an extension head 4-22 which are sequentially connected with a power output end of the power device from top to bottom;

the rotating shaft 4-14, the torque sensor 4-16, the transition shaft 4-17, the universal joint 4-18 and the extension head 4-22 are all fixed on the moving mechanism through a fixing frame 4-19.

In the embodiment, the moving mechanism comprises an upper guide rail 4-2, a lower guide rail 4-2, a moving plate 4-3, a motor mounting plate 4-6, an upper servo motor 4-4, a lower servo motor 4-7, a synchronous pulley II 4-7, a synchronous pulley I4-8 and a ball screw 4-9,

the upper and lower guide rails 4-2 are vertically arranged on the ball screw 4-01;

the moving plate 4-3 is connected with the upper and lower guide rails 4-2 in a sliding way;

the motor mounting plate 4-6 is fixed on the ball screw 4-01 and is positioned on the corresponding surface of the moving plate 4-3;

the upper servo motor 4-4 and the lower servo motor 4-4 are fixed at the lower end of the motor mounting plate 4-6, the power output end of the upper servo motor 4-4 extends to the upper end of the motor mounting plate 4-6, and the upper servo motor 4-4 and the lower servo motor 4-4 are electrically connected with the electric cabinet 2;

the synchronous belt wheel II 4-7 is connected with the power output end of the upper servo motor 4-4 and the lower servo motor 4-4;

the synchronous pulley I4-8 is arranged between the moving plate 4-3 and the supporting seat 4-1, and the synchronous pulley I4-8 is in transmission connection with the synchronous pulley II 4-7 through a synchronous belt;

one end of a ball screw 4-9 is fixedly connected with the lower end of the synchronous pulley I4-8, and the other end of the ball screw is in transmission connection with the moving plate 4-3.

The power device comprises a rotating shaft support frame 4-15, a torque servo motor 4-12, a synchronous belt wheel III 4-11 and a synchronous belt wheel IV 4-13;

the rotating shaft support frame 4-15 is fixed on the moving plate 4-3 and is positioned at the upper end of the moving plate 4-3;

the torque servo motor 4-12 is fixed on the rotating shaft support frame 4-15, and the torque servo motor 4-12 is electrically connected with the electric cabinet 2;

the synchronous belt wheel III 4-11 is connected with the output end of the torque servo motor 4-12;

the synchronous belt wheels IV 4-13 are arranged on one sides of the synchronous belt wheels III 4-11 and are the same in height, and the synchronous belt wheels IV 4-13 are in transmission connection with the synchronous belt wheels III 4-11 through a synchronous belt.

The limiting device comprises a fixed clamping jaw 4-20 arranged around the extending head 4-22 and a clamping jaw block 4-21 fixed on the fixed clamping jaw 4-20 and used for setting the position of the extending head 4-22.

When the movable plate is used, the upper servo motor 4-4 and the lower servo motor rotate to drive the synchronous belt pulley II 4-7 to rotate, so that the synchronous belt drives the synchronous belt pulley I4-8 to rotate, the ball screw 4-9 drives the movable plate 4-3 to move up and down, and the upper guide rail 4-2 and the lower guide rail 4-2 on the two sides of the movable plate 4-3 enable the whole movable plate to move up and down more stably.

The implementation also comprises a motor tensioning plate 4-5, wherein the motor tensioning plate 4-5 is arranged between the motor mounting plate 4-6 and the upper and lower servo motors 4-4, and the motor tensioning plate 4-5 is fixedly connected with the upper and lower servo motors 4-4 and detachably connected with the motor tensioning plate 4-5.

The motor tensioning plates 4-5 can tension the synchronous belts of the upper and lower servo motors 4-4 by adjusting the position relation on the motor mounting plates 4-6, so that the operation is more stable, the synchronous belts realize synchronous motion, and the control performance is high.

The positioning clamp in the embodiment comprises a quick clamp fixing frame 5-3, a cylinder fixing plate 5-5, a workpiece supporting column 5-2, a quick clamp 5-4, a positioning cylinder 5-6 and a workpiece supporting piece 5-7;

the fast clamp fixing frame 5-3 is fixed on the clamp fast changing plate 5-1; the cylinder fixing plate 5-5 is used for fixing one side end of the fast clamp fixing frame 5-3; the positioning cylinder 5-6 is fixed on the cylinder fixing plate 5-5, the quick clamp 5-4 is arranged on the quick clamp fixing frame 5-3, the opening of the quick clamp fixing frame corresponds to the through hole and is in transmission connection with the positioning cylinder 5-6, the workpiece support column 5-2 is arranged on the periphery of the through hole and is fixedly connected with the clamp quick-change plate 5-1, and the workpiece support piece 5-7 is arranged on one side of the quick clamp 5-4 and is fixedly connected with the clamp quick-change plate 5-1.

In this embodiment, the number of the workpiece support columns 5-2 is 3, the workpiece support columns are uniformly arranged on the periphery of the through hole, and the workpiece support columns 5-2 can better play a supporting role.

In the implementation, the locking device further comprises a locking cylinder 6-3, a lifting bottom plate 6-4 and a floating seat 6-5; the shell of the dead locking cylinder 6-3 is fixed on the fixed frame 6-1, the output end of the dead locking cylinder 6-3 penetrates through the fixed frame 6-1 to be fixedly connected with the lifting bottom plate 6-4, the floating seat 6-5 is fixed on the lifting bottom plate 6-4 and is positioned on the surface opposite to the dead locking cylinder 6-3, the floating head 6-6 is arranged on the floating seat 6-5, and the dead locking cylinder 6-3 is electrically connected with the electric cabinet 2.

According to the technical scheme, the electric cabinet 2 can be controlled through the touch screen controller 1 to further control the up-and-down movement of the locking cylinder 6-3, the operation and control performance is high, the locking cylinder 6-3 can drive the floating head 6-6 to move up and down, and the floating head is adopted to be connected with a tested product, so that a spline can be prevented from being damaged, and detection damage can not be caused later.

Furthermore, the locking device also comprises a guide shaft 6-2, the guide shafts 6-2 are a plurality of guide shafts which are respectively arranged on the side edges of the locking air cylinder 6-3, one end of any one guide shaft 6-2 is fixedly connected with the lifting bottom plate 6-4, and the other end is arranged on the fixed frame 6-1 and is in sliding connection with the fixed frame 6-1.

By adopting the technical scheme, the dead-lock cylinder 6-3 can be stabilized by using the guide shaft 6-2, so that the dead-lock cylinder 6-3 can stably support the lifting bottom plate 6-4 to move up and down under the action of the guide shaft 6-2, the deviation displacement of the lifting bottom plate 6-4, the floating seat 6-5 and the floating head 6-6 is prevented, the deviation of monitored equipment is effectively prevented, and the experimental data is inaccurate.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

An EPS no-load test and sensor calibration machine, which is characterized by comprising

The device comprises a rack (3), wherein the rack (3) comprises an experiment platform frame (31) and a control platform frame (32), and the control platform frame (32) is fixed on the upper part of the experiment platform frame (31);

the touch screen controller (1), the touch screen controller (1) is fixed on one side of the control rack (32);

the electric control box (2) is electrically connected with the touch screen controller (1), and the electric control box (2) is fixed on the other side of the control rack (32);

the experiment unit (4), the experiment unit (4) comprises a supporting seat (4-1) and a performance detection experiment instrument vertically arranged on the supporting seat (4-1); the supporting seat (4-1) is fixed on the experiment platform frame (31) and is positioned in the control bench frame (32); the performance detection experiment instrument (42) is electrically connected with the electric control box (2);

the positioning fixture (5) comprises a fixture quick-change plate (5-1) and a positioning clamp which is vertically arranged on the fixture quick-change plate (5-1) and used for fixing a workpiece; the clamp quick-change plate (5-1) is fixed on the supporting seat (4-1), and the positioning clamp is electrically connected with the electric cabinet (2); the clamp quick-change plate (5-1) and the support seat (4-1) are provided with a through hole at the position corresponding to the axis of the performance detection experiment instrument;

the locking mechanism (6), the locking mechanism (6) comprises a fixed frame (6-1) and a locking device which is vertically arranged on the fixed frame (6-1) and used for locking the workpiece; the fixing frame (6-1) is fixed below the supporting seat (4-1), the locking device is provided with a floating head (6-6), and the floating head (6-6) is arranged in the through hole.
2. The EPS empty load test and sensor calibration machine as claimed in claim 1, wherein the performance detection tester comprises a tester and a moving mechanism for driving the tester to move up and down in the vertical direction;

a ball screw (4-01) is vertically fixed on the supporting seat (4-1), and the moving mechanism is connected to the ball screw (4-01) in a sliding manner;

the experimental instrument comprises a power device, and a rotating shaft (4-14), a torque sensor (4-16), a transition shaft (4-17), a universal joint (4-18) and an extension head (4-22) which are sequentially connected with a power output end of the power device from top to bottom;

the rotating shaft (4-14), the torque sensor (4-16), the transition shaft (4-17), the universal joint (4-18) and the extension head (4-22) are all fixed on the moving mechanism through a fixing frame (4-19).
3. The EPS empty test and sensor calibration machine of claim 2, wherein the moving mechanism comprises,

the upper guide rail and the lower guide rail (4-2), and the upper guide rail and the lower guide rail (4-2) are vertically arranged on the ball screw (4-01);

the moving plate (4-3), the moving plate (4-3) is connected with the upper and lower guide rails (4-2) in a sliding manner;

the motor mounting plate (4-6) is fixed on the ball screw (4-01) and is positioned on the corresponding surface of the moving plate (4-3);

the upper and lower servo motors (4-4) are arranged at the lower ends of the motor mounting plates (4-6), the power output ends of the upper and lower servo motors (4-4) extend to the upper ends of the motor mounting plates (4-6), and the upper and lower servo motors (4-4) are electrically connected with the electric cabinet (2);

the synchronous belt wheel II (4-7), the synchronous belt wheel II (4-7) is connected with the power output end of the upper servo motor and the lower servo motor (4-4);

the synchronous pulley I (4-8), the synchronous pulley I (4-8) is arranged between the moving plate (4-3) and the supporting seat (4-1), and the synchronous pulley I (4-8) is in transmission connection with the synchronous pulley II (4-7) through a synchronous belt;

one end of the ball screw (4-9) is fixedly connected with the lower end of the synchronous pulley I (4-8), and the other end of the ball screw (4-9) is in transmission connection with the moving plate (4-3).
4. The EPS no-load test and sensor calibration machine of claim 3, further comprising a motor tensioning plate (4-5), wherein the motor tensioning plate (4-5) is arranged between the motor mounting plate (4-6) and the upper and lower servo motors (4-4), and the motor tensioning plate (4-5) is fixedly connected with the upper and lower servo motors (4-4) and detachably connected with the motor mounting plate (4-6).
5. The EPS empty test and sensor calibration machine as claimed in claim 3, wherein the power device comprises

The rotating shaft support frames (4-15), the rotating shaft support frames (4-15) are fixed on the moving plates (4-3) and are positioned at the upper ends of the moving plates (4-3);

the torque servo motors (4-12), the torque servo motors (4-12) are fixed on the rotating shaft supporting frames (4-15), and the torque servo motors (4-12) are electrically connected with the electric cabinet (2);

the synchronous belt wheel III (4-11), the synchronous belt wheel III (4-11) is connected with the output end of the torque servo motor (4-12);

the synchronous belt wheels IV (4-13) are arranged on one sides of the synchronous belt wheels III (4-11) and are the same in height, and the synchronous belt wheels IV (4-13) are in transmission connection with the synchronous belt wheels III (4-11) through synchronous belts.
6. An EPS empty test and sensor calibration machine according to claim 3 or 5, characterized by further comprising a limiting device, wherein the limiting device comprises a fixed clamping jaw (4-20) arranged around the extension head (4-22) and a clamping jaw block (4-21) fixed on the fixed clamping jaw (4-20) and used for setting the position of the extension head (4-22).
7. The EPS no-load test and sensor calibration machine of claim 1, wherein the positioning clamp comprises a quick clamp fixing frame (5-3), a cylinder fixing plate (5-5), a workpiece supporting column (5-2), a quick clamp (5-4), a positioning cylinder (5-6) and a workpiece supporting piece (5-7);

the quick clamp fixing frame (5-3) is fixed on the clamp quick-change plate (5-1); the cylinder fixing plate (5-5) is used for fixing one side end of the quick clamp fixing frame (5-3); the positioning cylinder (5-6) is fixed on the cylinder fixing plate (5-5), the quick clamp (5-4) is arranged on the quick clamp fixing frame (5-3), the opening of the quick clamp is corresponding to the through hole and is in transmission connection with the positioning cylinder (5-6), the workpiece supporting columns (5-2) are arranged on the periphery of the through hole and are fixedly connected with the clamp quick-change plate (5-1), and the workpiece supporting pieces (5-7) are arranged on one side of the quick clamp (5-4) and are fixedly connected with the clamp quick-change plate (5-1).
8. The EPS empty test and sensor calibration machine as claimed in claim 3, wherein the locking device further comprises a locking cylinder (6-3), a lifting bottom plate (6-4) and a floating seat (6-5); the shell of the dead locking cylinder (6-3) is fixed on the fixing frame (6-1), the output end of the dead locking cylinder (6-3) penetrates through the fixing frame (6-1) to be fixedly connected with the lifting bottom plate (6-4), the floating seat (6-5) is fixed on the lifting bottom plate (6-4) and located on the surface opposite to the dead locking cylinder (6-3) in connection, the floating head (6-6) is arranged on the floating seat (6-5), and the dead locking cylinder (6-3) is electrically connected with the electric cabinet (2).
9. The EPS no-load test and sensor calibration machine of claim 8, wherein the locking device further comprises a plurality of guide shafts (6-2), the guide shafts (6-2) are respectively arranged at the side edges of the locking cylinder (6-3), one end of any guide shaft (6-2) is fixedly connected with the lifting bottom plate (6-4), and the other end is arranged on the fixed frame (6-1) and is slidably connected with the fixed frame (6-1).