Dynamometer

Abstract

The utility model relates to the technical field of power measurement, in particular to a dynamometer which comprises a supporting frame, a loading machine, a protection cover and a detection assembly, the supporting frame comprises a supporting seat, a mounting seat and a bottom plate, the lower end of the supporting seat is connected to one end of the bottom plate along the bottom plate, the lower end of the mounting seat is connected to the other end of the bottom plate, and the loading machine is connected between the supporting seat and the mounting seat. The protection cover sleeves the periphery of the load machine, two ends of the protection cover are respectively connected to the mounting seat and the supporting seat, the supporting seat is provided with a wire inlet, the wire inlet is used for allowing a three-phase cable to pass through, the mounting seat is provided with a containing groove, the detection assembly is embedded in the containing groove and is used for detecting the rotating speed and the torque of the load machine, and an output port is formed in the groove wall of the containing groove. And the output port is used for a connecting wire of the detection assembly and an external instrument to pass through. The wire inlet of the three-phase cable is far away from the output port of the connecting wire of the detection assembly and the external instrument, thereby reducing the interference of the three-phase power on the electric signal output by the detection assembly, and improving the accuracy of the output value of the dynamometer.

Description

Technical Field

[0001] The present application relates to the technical field of power measurement, and in particular to a dynamometer. Background Art

[0002] The dynamometer can be used to test the torque and speed of the motor. It can also be used to test the production line and the motor products before they leave the factory. It can test the entire performance curve of the motor from no-load to stalled. While testing the performance of the motor at no-load and load points, it can also detect the input voltage, current, power and other conditions; thereby helping production and R&D personnel to better understand the parameters and usage of the motor and make improvement measures. Conventional dynamometers (consisting of a load machine, a rotary torque and speed sensor and a coupling) sense the torque of the motor through sensors, and their accuracy depends on the measurement accuracy of the sensor itself and the installation accuracy of the couplings before and after the sensor.

[0003] The existing dynamometer is connected to three-phase electricity from the outside to drive the dynamometer to operate, and then the analog signal is transmitted to the external instrument through the sensor to facilitate the observation of the measured data. The three-phase power inlet and the sensor signal output port are located on the same side, which makes it easy for the three-phase power to interfere with the analog signal output by the sensor, affecting the accuracy of the output signal and the detection accuracy of the dynamometer. Utility Model Content

[0004] In order to reduce the interference of three-phase electricity on analog signals and improve the detection accuracy of the dynamometer, the present application provides a dynamometer.

[0005] The dynamometer provided in this application adopts the following technical solution:

[0006] A dynamometer comprises a support frame, a load machine, a protective cover and a detection assembly, the support frame comprises a support base, a mounting base and a base plate, the lower end of the support base is connected to one end of the base plate along the length direction of the base plate, the lower end of the mounting base is connected to the other end of the base plate, the load machine is connected between the support base and the mounting base, the protective cover is sleeved on the outer periphery of the load machine, the two ends of the protective cover are respectively connected to the mounting base and the support base, the support base is provided with a line inlet, the line inlet is used for passing a three-phase cable connected to the load machine, the mounting base is provided with a receiving groove, the detection assembly is embedded in the receiving groove, the detection assembly is used to detect the rotation speed and torque of the load machine, the receiving groove wall is provided with an output port, the output port is used for passing a connecting line between the detection assembly and an external instrument.

[0007] By adopting the above technical solution, the line inlet of the three-phase cable and the output of the detection component and the external instrument connection line are kept away from each other, thereby reducing the interference of the three-phase electricity on the electrical signal output by the detection component and improving the accuracy of the output value of the dynamometer.

[0008] Preferably, the three-phase power cable is arranged in a loose state.

[0009] By adopting the above technical solution, the three-phase cable is set in a relaxed state, so that the three-phase cable will not affect the load machine, reducing the possibility of the three-phase cable pulling the load machine and affecting the value measured by the detection component, thereby improving the accuracy of the output value of the dynamometer.

[0010] Preferably, the mounting seat comprises a seat body and a cover plate, a side of the seat body away from the bottom plate is provided with a receiving groove, and the cover plate is connected to the seat body and covers the notch of the receiving groove.

[0011] By adopting the above technical solution, the detection component is embedded in the receiving groove, which makes it easy to repair and replace the detection component in the receiving groove after opening the cover.

[0012] Preferably, a mounting groove is provided at the groove wall of the accommodating groove away from the bottom plate, the cover plate is embedded in the mounting groove, and the side wall of the cover plate is in contact with the groove wall of the mounting groove.

[0013] By adopting the above technical solution, the wall of the installation groove fits with the side wall of the cover plate, so as to achieve the initial positioning of the cover plate, which is convenient for the subsequent fixation between the cover plate and the seat body.

[0014] Preferably, both ends of the protective cover are provided with embedded rings respectively, the support seat is provided with a first ring groove on the side facing the base plate, the first ring groove is used for the embedded ring to be embedded, and the mounting seat is provided with a second ring groove on the side facing the base plate, the second ring groove is used for the embedded ring to be embedded.

[0015] By adopting the above technical solution, the embedded ring is embedded in the first ring groove and the second ring groove respectively, which improves the stability of the connection between the protective cover and the mounting seat and the support seat. It is only necessary to align the embedded ring with the first ring groove and the second ring groove to facilitate the installation and disassembly of the protective cover and the mounting seat and the support seat.

[0016] Preferably, the load machine includes a rotor, a stator and a casing, the two ends of the casing along the length direction are respectively connected to a mounting seat and a support seat, the stator is connected to the inner side of the casing, the rotor is rotatably connected to the casing, the rotation axis of the rotor is parallel to the length direction of the base plate, the casing is provided with a cavity, the cavity wall is provided with an air inlet and an air outlet, and the air inlet and the air outlet are both connected to the outside.

[0017] By adopting the above technical solution, the casing is provided with a cavity, and the cavity wall is provided with an air inlet and an air outlet, so that the cooling gas enters the cavity from the air inlet and is discharged from the air outlet, thereby cooling the load machine, improving the thermal stability of the load machine, and increasing the service life of the load machine.

[0018] Preferably, the casing further comprises a heat sink, the heat sink is embedded in the cavity, a plurality of heat sinks are provided, the plurality of heat sinks are evenly distributed along the axial direction of the casing, the heat sink divides the cavity into a plurality of cooling cavities, the heat sink is provided with a connecting hole, and the connecting hole connects two adjacent cooling cavities.

[0019] By adopting the above technical solution, the heat sink divides the cavity into several cooling cavities, and connects two adjacent cooling cavities through connecting holes, so that the contact area between the cooling gas and the casing is increased, so that the heat sink and the casing are in full contact, thereby improving the cooling effect of the cooling gas on the load machine.

[0020] Preferably, a line connecting geometric centers of connection holes of adjacent heat sinks is not parallel to the axis of the housing.

[0021] By adopting the above technical solution, when the cooling gas enters the next cooling cavity from the connecting hole, it first impacts the heat sink, slows down the flow rate of the cooling gas, increases the time the cooling gas stays in the cooling groove, and fully utilizes the cooling gas.

[0022] Preferably, a through hole is provided on a side of the protective cover close to the bottom plate, and the air inlet and the air outlet are located on a side of the housing close to the bottom plate.

[0023] By adopting the above technical solution, the through hole connects the inside of the protective cover with the outside, so that the gas inside the protective cover is connected with the outside, which is convenient for the discharge of the gas with higher temperature in the protective cover and the entry of the gas with lower temperature, thereby realizing the cooling of the load machine. The through hole facilitates the installation and disassembly of the pipes connecting the air inlet and the air outlet.

[0024] Preferably, it also includes a controller, which is embedded in the accommodating groove. The controller includes an analog signal circuit board and a digital signal circuit board. The analog signal circuit board is used to receive the detection signal of the detection component and convert it into an analog signal, and the digital signal circuit board is used to convert the analog signal output by the analog signal circuit board into a digital signal. The controller is provided with a network cable connection port, and the network cable connection port is used to connect to a network cable.

[0025] By adopting the above technical solution, the electrical signal output by the detection component is converted into a digital signal in the accommodating cavity through the embedded controller. The digital signal is not easily interfered by three-phase electricity, thus avoiding the interference of three-phase electricity during the transmission of the electrical signal, improving the stability of the signal transmission process, and improving the accuracy of the dynamometer detection.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Keep the inlet of the three-phase cable and the outlet of the detection component and the external instrument connection line away from each other to reduce the interference of the three-phase electricity on the electrical signal output by the detection component and improve the accuracy of the output value of the dynamometer;

[0028] 2. The three-phase cable is set in a loose state so that the three-phase cable will not affect the load machine, reducing the possibility of the three-phase cable pulling the load machine and affecting the value measured by the detection component, thereby improving the accuracy of the output value of the dynamometer;

[0029] 3. Through the embedded controller, the electrical signal output by the detection component is converted into a digital signal in the accommodating cavity. The digital signal is not easily interfered by three-phase electricity, thus avoiding interference from three-phase electricity during the transmission of the electrical signal, improving the stability of the signal transmission process, and improving the accuracy of the dynamometer detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of the dynamometer.

[0031] Figure 2 It is a cross-sectional view of the dynamometer.

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0033] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0034] Figure 5 It is a cross-sectional view of the load machine.

[0035] Figure 6 It is a schematic diagram of the partial structure of the dynamometer.

[0036] Figure 7 It is a structural schematic diagram of the load machine and torque contact device.

[0037] Description of reference numerals:

[0038] 1. Support frame; 11. Support seat; 111. Inlet; 112. First ring groove; 113. Connecting groove; 114. Second connecting hole; 12. Mounting seat; 121. Seat body; 1211. Accommodating groove; 1212. Output port; 1213. Mounting groove; 1214. Second ring groove; 1215. First connecting hole; 122. Cover plate; 13. Bottom plate;

[0039] 2. Load machine; 21. Rotor; 22. Stator; 23. Casing; 231. Shell; 2311. Cavity; 2312. Air inlet; 2313. Air outlet; 2314. Heat sink; 2315. Cooling cavity; 2316. Connecting hole; 2317. First convex ring; 2318. Second convex ring; 232. Front cover; 2321. Front connecting column; 2322. First positioning groove; 2323. First embedded groove; 2324. Third embedded groove; 233. Rear cover; 2331. Rear connecting column; 2332. Second positioning groove; 2333. Second embedded groove;

[0040] 3. Protective cover; 31. Embedded ring; 32. Through hole;

[0041] 4. Three-phase cable;

[0042] 51. first deep groove ball bearing; 52. second deep groove ball bearing; 53. third deep groove ball bearing; 54. fourth deep groove ball bearing;

[0043] 6. Detection assembly; 61. Speed ​​detection device; 62. Torque detection device; 621. Upper fixing screw; 622. Lower fixing screw; 623. Sensor; 624. Force-bearing connecting piece; 625. Needle bearing; 626. Force-bearing shaft;

[0044] 7. Controller; 71. Analog signal circuit board; 72. Digital signal circuit board; 73. Network cable connection port. DETAILED DESCRIPTION

[0045] The present application is further described in detail below in conjunction with the accompanying drawings.

[0046] Reference Figure 1 The embodiment of the present application discloses a dynamometer including a support frame 1, a load machine 2 and a three-phase cable 4. The support frame 1 includes a support seat 11, a mounting seat 12 and a bottom plate 13. The lower end of the support seat 11 is fixedly connected to one end of the bottom plate 13 along the length direction of the bottom plate 13, and the lower end of the mounting seat 12 is fixedly connected to the other end of the bottom plate 13.

[0047] Reference Figure 1 and Figure 2 The load machine 2 is connected between the support base 11 and the mounting base 12. A line inlet 111 is provided on one side of the support base 11 along the width direction of the bottom plate 13, and a connection groove 113 is provided on one side of the support base 11 close to the bottom plate 13. The connection groove 113 is connected to the line inlet 111. The three-phase cable 4 passes through the line inlet 111 and the connection groove 113 in sequence and is connected to the load machine 2. The three-phase cable 4 provides power for the operation of the load machine 2.

[0048] The mounting seat 12 includes a seat body 121 and a cover plate 122. The lower end of the seat body 121 is fixedly connected to one end of the bottom plate 13 away from the support seat 11. A receiving groove 1211 is provided on the side of the seat body 121 away from the bottom plate 13. The cover plate 122 is fixedly connected to the seat body 121 and covers the notch of the receiving groove 1211. A mounting groove 1213 is provided at the groove wall of the side of the receiving groove 1211 away from the bottom plate 13. The cover plate 122 is embedded in the mounting groove 1213. The surface of the cover plate 122 on one side facing the bottom plate 13 abuts against the bottom of the mounting groove 1213. The side wall of the cover plate 122 and the groove wall of the mounting groove 1213 are in contact with each other.

[0049] Reference Figure 2 and Figure 3 , a dynamometer also includes a first deep groove ball bearing 51. The load machine 2 includes a housing 23. The housing 23 includes a front end cover 232 and a shell 231. The front end cover 232 is rotatably connected to a side surface of the seat body 121 facing the base plate 13, and the rotation axis of the front end cover 232 is parallel to the length direction of the base plate 13. A front connecting column 2321 is connected to one end of the front end cover 232 close to the seat body 121. A first connecting hole 1215 is provided at the bottom of the accommodating groove 1211, and the first deep groove ball bearing 51 is embedded in the first connecting hole 1215, and the front connecting column 2321 is embedded in the first deep groove ball bearing 51. In this embodiment, the outer ring of the first deep groove ball bearing 51 is interference fit with the inner wall of the first connecting hole 1215, and the inner ring of the first deep groove ball bearing 51 is interference fit with the outer periphery of the front connecting column 2321.

[0050] The end of the front cover 232 away from the seat body 121 is provided with a first positioning groove 2322, and the end of the housing 231 close to the front cover 232 is connected with a first convex ring 2317, and the first convex ring 2317 is embedded in the first positioning groove 2322. In this embodiment, the outer wall of the first convex ring 2317 fits with the groove wall of the first positioning groove 2322, and the side surface of the first convex ring 2317 facing the front cover 232 abuts against the groove bottom of the first positioning groove 2322.

[0051] Reference Figure 2 and Figure 4 , a dynamometer also includes a second deep groove ball bearing 52. One end of the rear end cover 233 away from the housing 231 is rotatably connected to a side surface of the support seat 11 facing the bottom plate 13, and the rotation axis of the rear end cover 233 coincides with the rotation axis of the front end cover 232. One end of the rear end cover 233 close to the support seat 11 is connected to the rear connecting column 2331, and a second connecting hole 114 is provided on the side of the support seat 11 close to the bottom plate 13, and the second connecting hole 114 passes through the support seat 11. The second deep groove ball bearing 52 is embedded in the second connecting hole 114, and the rear connecting column 2331 is embedded in the second deep groove ball bearing 52. In this embodiment, the outer ring of the second deep groove ball bearing 52 is interference fit with the inner wall of the second connecting hole 114, and the inner ring of the second deep groove ball bearing 52 is interference fit with the outer periphery of the rear connecting column 2331.

[0052] A second positioning groove 2332 is provided at one end of the rear end cover 233 away from the support seat 11, and a second convex ring 2318 is connected to one end of the housing 231 away from the front end cover 232, and the second convex ring 2318 is embedded in the second positioning groove 2332. In this embodiment, the outer wall of the second convex ring 2318 fits with the groove wall of the second positioning groove 2332, and the side surface of the second convex ring 2318 facing the rear end cover 233 abuts against the groove bottom of the second positioning groove 2332.

[0053] Reference Figure 2 and Figure 5 The load machine 2 further includes a rotor 21 and a stator 22. The stator 22 is coaxially fixedly connected to the inner side of the housing 231, and the rotor 21 is rotatably connected to the stator 22, and the rotation axis of the rotor 21 coincides with the rotation axis of the front end cover 232.

[0054] Reference Figure 3 and Figure 4 , a dynamometer further includes a third deep groove ball bearing 53 and a fourth deep groove ball bearing 54. A first embedding groove 2323 is coaxially provided on the side of the front end cover 232 facing the housing 231, the third deep groove ball bearing 53 is embedded in the first embedding groove 2323, one end of the rotor 21 is embedded in the third deep groove ball bearing 53, and one end of the rotor 21 passes through the front end cover 232 and then extends into the receiving groove 1211. In this embodiment, the outer ring of the third deep groove ball bearing 53 is interference fit with the groove wall of the first embedding groove 2323, and the inner ring of the third deep groove ball bearing 53 is interference fit with the outer periphery of the rotor 21. A second embedding groove 2333 is coaxially provided on the side of the rear end cover 233 facing the housing 231, the fourth deep groove ball bearing 54 is embedded in the second embedding groove 2333, the other end of the rotor 21 is embedded in the fourth deep groove ball bearing 54, and the other end of the rotor 21 passes through the rear end cover 233 and then extends out of the mounting seat 12. In this embodiment, the outer ring of the fourth deep groove ball bearing 54 is interference fit with the groove wall of the second embedding groove 2333 , and the inner ring of the fourth deep groove ball bearing 54 is interference fit with the outer periphery of the rotor 21 .

[0055] Reference Figure 5The shell 231 is provided with a cavity 2311, and an air inlet 2312 and an air outlet 2313 are provided at the cavity wall on one side of the cavity 2311 close to the bottom plate 13, and the air inlet 2312 and the air outlet 2313 are both connected to the outside. The air inlet 2312 is located on the side of the cavity 2311 close to the front end cover 232, and the air outlet 2313 is located on the side of the cavity 2311 close to the rear end cover. The shell 231 also includes a plurality of heat sinks 2314, and the plurality of heat sinks 2314 are embedded in the cavity 2311, and the plurality of heat sinks 2314 are evenly distributed along the axial direction of the rotor 21. In this embodiment, nine heat sinks 2314 are provided. The plurality of heat sinks 2314 divide the cavity 2311 into a plurality of cooling chambers 2315. The heat sink 2314 is provided with a connecting hole 2316, and the connecting hole 2316 connects two adjacent cooling chambers 2315. The line connecting the geometric centers of the connection holes 2316 of adjacent heat sinks 2314 is not parallel to the rotation axis of the rotor 21 .

[0056] Reference Figure 1 and Figure 6 A dynamometer also includes a detection component 6. The detection component 6 is embedded in the receiving groove 1211. The detection component 6 is used to detect the rotation speed and torque of the load machine 2. An output port 1212 is provided at the groove wall of one side of the receiving groove 1211 along the width direction of the bottom plate 13. The output port 1212 is connected to the outside world. The output port 1212 is used for the connection line between the detection component 6 and the external instrument to pass through. The detection component 6 includes a rotation speed detection device 61 and a torque detection device 62. The rotation speed detection device 61 is connected to one end of the rotor 21 extending into the receiving groove 1211. The rotation speed detection device 61 is used to detect the rotation speed of the rotor 21. The torque detection device 62 includes an upper fixed screw 621, a lower fixed screw 622, a sensor 623, a force-bearing connector 624, a needle bearing 625 and a force-bearing shaft 626. The force-bearing connector 624 is rectangular in shape, hollowed out in the middle, and the shape of the hollow is rectangular. The force-bearing connector 624 is connected to the sensor 623 through the upper fixing screw 621, and the sensor 623 is connected to the wall of the receiving groove 1211 through the lower fixing screw 622. The sensor 623 is rectangular, hollowed out in the middle, and the hollowed-out shape is rectangular. The front and rear surfaces of the hollowed-out part of the sensor 623 are covered with a rectangular plate. A bolt connector is set on the left side of the sensor 623, and a needle bearing 625 is set at the hollowed-out center of the force-bearing connector 624, and a force-bearing shaft 626 is set in the middle of the needle bearing 625.

[0057] Reference Figure 7 A third embedding groove 2324 is provided on one side of the front end cover 232 close to the seat body 121 , and one end of the force-bearing shaft 626 penetrates through the bottom of the accommodating groove 1211 and is embedded in the third embedding groove 2324 .

[0058] Reference Figure 6A dynamometer also includes a controller 7, which is embedded in the receiving groove 1211. The controller 7 includes an analog signal circuit board 71 and a digital signal circuit board 72. The analog signal circuit board 71 is used to receive signals from the speed detection device 61 and the torque detection device 62 and convert them into analog signals. The digital signal circuit board 72 is connected to a CPU module, and the digital signal circuit board 72 is used to receive the analog signal output by the analog signal circuit board 71 and convert it into a digital signal. The controller 7 is provided with a network cable connection port 73, and the network cable connection port 73 is used to connect to a network cable.

[0059] Reference Figure 2 A dynamometer also includes a protective cover 3. The protective cover 3 is coaxially sleeved on the outer periphery of the load machine 2, and the two ends of the protective cover 3 are respectively fixedly connected to the support seat 11 and the seat body 121. The two ends of the protective cover 3 are respectively fixedly connected with an embedded ring 31, and a first annular groove 112 is provided on the side of the support seat 11 close to the bottom plate 13, and the first annular groove 112 is used for the embedded ring 31 on the side of the protective cover 3 close to the support seat 11 to be embedded. In this embodiment, the outer wall and the inner wall of the embedded ring 31 are in contact with the groove wall of the first annular groove 112, and the end of the protective cover 3 close to the support seat 11 abuts against the side surface of the support seat 11 close to the bottom plate 13. A second annular groove 1214 is provided on the side of the seat body 121 close to the bottom plate 13, and the second annular groove 1214 is used for the embedded ring 31 on the side of the protective cover 3 close to the seat body 121 to be embedded. In this embodiment, the outer wall and inner wall of the embedded ring 31 fit with the groove wall of the second annular groove 1214, and the end of the protective cover 3 close to the seat body 121 abuts against the side surface of the seat body 121 close to the bottom plate 13. A through hole 32 is provided on one side of the protective cover 3 close to the bottom plate 13.

[0060] The implementation principle of a dynamometer in an embodiment of the present application is as follows: when in use, the motor shaft of the motor to be tested is connected to the motor shaft of the load machine 2 through a coupling, and then the motor to be tested rotates, thereby causing the motor shaft of the load machine 2 to rotate, thereby causing the shell 231 to rotate and drive the front end cover 232 to rotate, and the speed detection device 61 is installed on the rotor 21, and the speed of the motor to be tested is determined by detecting the speed of the speed, and the torque detection device 62 outputs the torque of the motor to be tested by detecting the rotation angle of the front end cover 232, and then the signals of the speed detection device 61 and the torque detection device 62 are converted into digital signals through the controller, and then a network cable is provided to output the digital signals to an external display.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dynamometer, characterized in that: The invention comprises a support frame (1), a load machine (2), a protective cover (3) and a detection component (6); the support frame (1) comprises a support seat (11), a mounting seat (12) and a bottom plate (13); the lower end of the support seat (11) is connected to one end of the bottom plate (13) along the length direction of the bottom plate (13); the lower end of the mounting seat (12) is connected to the other end of the bottom plate (13); the load machine (2) is connected between the support seat (11) and the mounting seat (12); the protective cover (3) is sleeved on the outer periphery of the load machine (2); the two ends of the protective cover (3) are respectively connected to the mounting seat (12); A mounting seat (12) and a support seat (11); the support seat (11) is provided with a line inlet (111); the line inlet (111) is used for passing a three-phase cable connected to a load machine (2); the mounting seat (12) is provided with a receiving groove (1211); the detection component (6) is embedded in the receiving groove (1211); the detection component (6) is used for detecting the rotation speed and torque of the load machine (2); the receiving groove (1211) is provided with an output port (1212) at the groove wall; the output port (1212) is used for passing a connection line between the detection component (6) and an external instrument.

2. The dynamometer according to claim 1, characterized in that: The three-phase cable is arranged in a loose state.

3. The dynamometer according to claim 1, characterized in that: The mounting seat (12) comprises a seat body (121) and a cover plate (122); a receiving groove (1211) is provided on a side of the seat body (121) away from the bottom plate (13); and the cover plate (122) is connected to the seat body (121) and covers the notch of the receiving groove (1211).

4. The dynamometer according to claim 3, characterized in that: A mounting groove (1213) is provided at the groove wall of the accommodating groove (1211) on the side away from the bottom plate (13); the cover plate (122) is embedded in the mounting groove (1213); and the side wall of the cover plate (122) and the groove wall of the mounting groove (1213) are in close contact with each other.

5. The dynamometer according to claim 1, characterized in that: The protective cover (3) is provided with an embedding ring (31) at both ends; the support seat (11) is provided with a first annular groove (112) on a side facing the bottom plate (13); the first annular groove (112) is used for embedding the embedding ring (31); the mounting seat (12) is provided with a second annular groove (1214) on a side facing the bottom plate (13); the second annular groove (1214) is used for embedding the embedding ring (31).

6. The dynamometer according to claim 5, characterized in that: The load machine (2) comprises a rotor (21), a stator (22) and a casing (23); the casing (23) is respectively connected to a mounting seat (12) and a support seat (11) at two ends along a length direction; the stator (22) is connected to the inner side of the casing (23); the rotor (21) is rotatably connected to the casing (23); the rotation axis of the rotor (21) is parallel to the length direction of the bottom plate (13); the casing (23) is provided with a cavity (2311); an air inlet (2312) and an air outlet (2313) are provided on the cavity wall of the cavity (2311); the air inlet (2312) and the air outlet (2313) are both connected to the outside.

7. The dynamometer according to claim 6, characterized in that: The housing (23) further comprises a heat sink (2314); the heat sink (2314) is embedded in the cavity (2311); a plurality of heat sinks (2314) are provided; the plurality of heat sinks (2314) are evenly distributed along the axial direction of the housing (23); the heat sink (2314) divides the cavity (2311) into a plurality of cooling chambers (2315); the heat sink (2314) is provided with a connecting hole (2316); and the connecting hole (2316) connects two adjacent cooling chambers (2315).

8. The dynamometer according to claim 7, characterized in that: A line connecting the geometric centers of the connection holes (2316) of adjacent heat sinks (2314) is not parallel to the axis of the housing (23).

9. The dynamometer according to claim 6, characterized in that: A through hole (32) is provided on a side of the protective cover (3) close to the bottom plate (13); and the air inlet (2312) and the air outlet (2313) are located on a side of the housing (23) close to the bottom plate (13).

10. The dynamometer according to claim 1, characterized in that: The device also comprises a controller (7); the controller (7) is embedded in the receiving groove (1211); the controller (7) comprises an analog signal circuit board (71) and a digital signal circuit board (72); the analog signal circuit board (71) is used to receive the detection signal of the detection component (6) and convert it into an analog signal; the digital signal circuit board (72) is used to convert the analog signal output by the analog signal circuit board (71) into a digital signal; the controller (7) is provided with a network cable connection port (73); the network cable connection port (73) is used to connect to a network cable.

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