A test bench and a test method for testing the equivalent life of a reducer

Abstract

The application discloses a test bench for testing equivalent life of a reducer, which comprises a fixing base and a testing device fixed on the fixing base; the testing device comprises a driving motor, a reducer to be tested, an inertia disc, a torque sensor and an angular acceleration sensor; the driving motor is fixed on the fixing base; the reducer to be tested is rotatably fixed on the side of the fixing base far from the driving motor; the output shaft of the driving motor is coaxially connected with the input end of the reducer to be tested; the output end of the reducer to be tested is coaxially fixed with the center of the inertia disc; the torque sensor is arranged on the output shaft of the driving motor; and the angular acceleration sensor is arranged on the inertia disc. The test bench of the application can not only accurately calculate the equivalent life of the actual running time of the reducer to be tested, but also has low requirements on the performance of the driving motor and can simulate the instantaneous large torque working condition of the impact phenomenon.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reducer test bench, in particular to a test bench for testing equivalent life of reducer and a testing method. BACKGROUND

[0002] With the continuous development of informatization and industrialization, the application of industrial robots is becoming more and more widely, and the performance of the reducer as the core component of the robot directly affects the overall performance of the robot. As a high-precision transmission component, the transmission accuracy, transmission efficiency and reliability of the reducer directly affect the function and life of the robot to a considerable extent. Therefore, the detection of the reducer becomes particularly important. The service life as a key application index of the reducer is a key problem restricting the development of robots.

[0003] At present, the fatigue life test device of the reducer for robots is mainly a one-way continuous rotation test bench or a reciprocating swing arm test bench. For example, the Chinese invention patent with the publication number CN106950061A discloses an RV reducer high-precision test test bench for transmission efficiency. The test bench is a one-way continuous rotation test bench, but the one-way continuous rotation test bench cannot simulate the actual working condition of the repeated start-stop and reciprocating motion of the reducer on the host machine such as a robot. Although the swing arm test bench can simulate the actual working condition of the repeated start-stop and reciprocating motion of the reducer on the host machine such as a robot, the load of the reducer is mainly composed of two parts during actual motion: inertia load and gravity eccentric load. Due to the existence of gravity eccentric load, the stress condition is relatively complex, and the calculation of equivalent moment is relatively difficult. Not only the test period is long, but also the equivalent life of the reducer cannot be accurately calculated, which leads to the fact that the swing arm test bench cannot accurately test the equivalent life of the reducer.

[0004] In addition, when the swing arm test bench tests the fatigue life of the reducer, the maximum loading torque is generally less than the allowable torque when the reducer starts and stops. For larger loading torque tests such as impact tests of the reducer, the swing arm test bench cannot be used. The reason is that during the impact test, the reducer needs to be subjected to five times the rated load in a short time, and the swing arm test bench mainly provides the eccentric load of the inertia disc, that is, the large-angle rotation of the test swing arm in a short time, which requires high performance of the driving motor. Generally, the driving motor cannot meet this requirement. SUMMARY

[0005] The technical problem to be solved by the present application is how to reduce the performance requirements of the driving motor and accurately test the equivalent life of the reducer.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] A test bench for testing the equivalent life of a reducer, comprising a fixed seat and a test device fixed on the fixed seat.

[0008] The test device comprises a driving motor, a reducer to be tested, an inertia disc, a torque sensor and an angular acceleration sensor, the driving motor is fixed on a fixed seat, the reducer to be tested is rotatably fixed on the side of the fixed seat far from the driving motor, and the output shaft of the driving motor is coaxially connected with the input end of the reducer to be tested, the output end of the reducer to be tested is coaxially fixed with the center of the inertia disc, the torque sensor is arranged on the output shaft of the driving motor, and the angular acceleration sensor is arranged on the inertia disc.

[0009] The test bench of the application can simulate the actual working conditions of the reducer in the main machine such as a robot, such as repeatedly starting and stopping and reciprocating motion, without changing the failure mechanism of the reducer to be tested, by applying a load to the output end of the reducer to be tested through the inertia disc, i.e. driving the driving motor to drive the reducer to be tested to make forward and reverse acceleration and deceleration motion, so that the output end of the reducer to be tested drives the inertia disc to make reciprocating swing motion.

[0010] Meanwhile, since the output end of the reducer to be tested is coaxially fixed with the center of the inertia disc, the load applied to the reducer to be tested only contains inertial load and does not contain gravity eccentric load, the stress condition is simple, the test period is short, the calculation of equivalent moment is simplified, the equivalent life of the actual running time of the reducer to be tested can be accurately calculated, and for the load test exceeding the allowable torque of the reducer to be tested when starting and stopping, only the parameters of the loading curve need to be changed to realize the test, the performance requirement of the driving motor is not high, and therefore the instantaneous large torque working condition of phenomena such as impact can also be simulated.

[0011] In addition, since the load applied to the reducer to be tested only contains inertial load and does not contain gravity eccentric load, the inertia disc can be rotated to any position as a starting position without the need for zero calibration and rotation angle calibration, and the hardware investment cost of the test bench is greatly saved.

[0012] Preferably, the fixed seat symmetrically fixes the test device at both ends, and can be counterweights, so as to avoid the danger of overturning of the single-sided fixed seat due to uneven stress.

[0013] Preferably, the fixed seat comprises a base, a support frame and a mounting plate, the base symmetrically fixes the support frame at both ends, the mounting plate is arranged through the support frame on the support frame, the driving motor is fixed on the opposite side of the mounting plate, and the reducer to be tested is rotatably fixed on the side opposite to the driving motor.

[0014] Preferably, the to-be-tested reducer is fixed to the fixed seat through a self-centering mechanism, the self-centering mechanism comprises a wedge-shaped outer ring, a wedge-shaped inner ring and a self-centering flange, the inner wall of the wedge-shaped outer ring is tapered, the wedge-shaped outer ring is fixed to the fixed seat, the outer wall of the wedge-shaped inner ring is tapered, the wedge-shaped inner ring is fixed in the wedge-shaped outer ring in cooperation with the wedge-shaped outer ring, the self-centering flange is rotatably sleeved in the wedge-shaped inner ring, and the to-be-tested reducer is coaxially fixed to the self-centering flange.

[0015] Since the driving motor and the to-be-tested reducer are installed on the same installation plate through the self-centering mechanism, the centering error of the to-be-tested reducer and the input shaft system is facilitated to be ensured, the installation precision requirement of the to-be-tested reducer is facilitated to be met, the to-be-tested reducer is facilitated to work under the optimal installation condition, the problems such as aggravation of bearing wear of the to-be-tested reducer, low transmission efficiency and early damage caused by installation eccentricity are avoided, and the misjudgment of the equivalent service life of the to-be-tested reducer is avoided.

[0016] In addition, compared with designing different installation plates of different specifications, designing different self-centering flanges of different specifications has lower manufacturing cost and is faster and more convenient to install, and only one mechanical stop error adjustment of the to-be-tested reducer and the self-centering flange is needed during assembly, so that the workload is reduced.

[0017] Preferably, the inertia disc comprises a basic inertia disc and an auxiliary inertia disc, the basic inertia disc is connected with the output end of the to-be-tested reducer, and a plurality of auxiliary inertia discs are further fixed on the basic inertia disc, so that the loading requirements of different reducers under different load conditions can be met by changing the number of the auxiliary inertia discs, and the applicability of the test bench is high.

[0018] Preferably, the auxiliary inertia disc is a circular ring and is coaxially fixed on the basic inertia disc.

[0019] Preferably, the output end of the to-be-tested reducer is connected with the basic inertia disc through a reducer output flange.

[0020] Preferably, a plurality of temperature sensors are further arranged on the shell of the to-be-tested reducer, so as to monitor the temperature change of the to-be-tested reducer during testing and provide criteria for fault pre-diagnosis of the to-be-tested reducer.

[0021] Preferably, a vibration sensor is further arranged on the shell of the to-be-tested reducer, so as to monitor the vibration signal change of the to-be-tested reducer and provide criteria for fault pre-diagnosis of the to-be-tested reducer.

[0022] Preferably, the application further provides a test method of the test bench for testing the equivalent service life of the reducer, and the test method comprises the following steps:

[0023] Step 1: After the installation of the reducer to be tested, drive the driving motor to drive the reducer to be tested and the inertia disc to rotate, and measure the input torque T1 of the reducer to be tested and the angular acceleration ε of the inertia disc through the torque sensor and the angular acceleration sensor;

[0024] Step 2: Since the output end of the reducer to be tested is coaxially fixed with the center of the inertia disc, the load applied to the reducer to be tested only contains the inertia load, without the gravity eccentric load, that is, the output torque T of the reducer to be tested is J·ε, wherein:

[0025] J—rotational inertia of the circular inertia disc;

[0026] ε—angular acceleration of the inertia disc;

[0027] Step 3: Calculate the equivalent life t according to the equivalent life calculation formula, that is:

[0028] In the formula:

[0029] t0—design life under rated torque;

[0030] n0—rated rotational speed of the output end;

[0031] T0—rated torque of the output end;

[0032] n m —average rotational speed of the output end during the test;

[0033] n m =∑t i n i / ∑t i ;

[0034] T m —average load torque of the output end during the test;

[0035]

[0036] e—life index;

[0037] Step 4: Calculate the transmission efficiency η according to the transmission efficiency calculation formula, that is:

[0038] In the formula:

[0039] J—rotational inertia of the circular inertia disc;

[0040] ε—angular acceleration of the inertia disc;

[0041] T1—input torque of the reducer to be tested;

[0042] i—reduction ratio of the reducer to be tested.

[0043] Through the above steps, it can be seen that the test method of this test bench can not only accurately calculate the equivalent life of the reducer under test after running time, but also calculate the real-time transmission efficiency of the reducer under test, and observe the degradation of the reducer under test by the change in efficiency.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] 1. The test bench of this invention applies a load to the output end of the reducer under test through an inertia disk without changing the failure mechanism of the reducer under test. That is, it drives the drive motor to drive the reducer under test to perform forward and reverse acceleration and deceleration motions from the input end of the reducer under test. This causes the output end of the reducer under test to drive the inertia disk to perform reciprocating oscillation motion, thereby simulating the actual working conditions of the reducer repeatedly starting and stopping and reciprocating motion on a host such as a robot. Finally, the equivalent life test of the reducer is completed by equivalent calculation of the load conditions and running time.

[0046] Meanwhile, since the output end of the reducer under test is fixed coaxially with the center of the inertia disk, the load applied to the reducer under test only includes inertial load and there is no gravitational eccentric load. The stress situation is simple, the test cycle is short, and the calculation of equivalent torque is simplified. This helps to accurately calculate the equivalent life of the reducer under test during actual operation. Furthermore, for load tests that exceed the allowable torque when the reducer under test starts and stops, it can be achieved simply by changing the parameters of the loading curve. The performance requirements of the drive motor are not high. Therefore, it can also simulate instantaneous high torque conditions such as impact.

[0047] In addition, since the load on the reducer under test only includes inertial load and there is no gravitational eccentric load, the inertia disk can be rotated to any position as the starting position, without the need for zero-position calibration and rotation angle calibration, which greatly saves the hardware investment cost of the test bench.

[0048] 2. Since the drive motor and the reducer under test are mounted on the same mounting plate through a self-centering mechanism, it helps to ensure the alignment error between the reducer under test and the input shaft system, meets the installation accuracy requirements of the reducer under test, and enables the reducer under test to work under optimal installation conditions. This avoids problems such as accelerated bearing wear, low transmission efficiency, and premature damage caused by misalignment during installation, which could lead to misjudgment of the equivalent life of the reducer under test.

[0049] In addition, designing different self-centering flanges for different specifications of reducers is cheaper to manufacture than designing different specifications of mounting plates, and is quick and easy to install. During assembly, only one mechanical stop error adjustment between the reducer under test and the self-centering flange is required, which reduces the workload.

[0050] 3、Through setting multiple auxiliary inertia discs on the base inertia disc, the loading demand of different reducers in different load conditions can be met by changing the number of auxiliary inertia discs, so that the applicability of the test bench is strong.

[0051] 4、The temperature sensor and the vibration sensor are arranged on the shell of the reducer to be tested, so as to monitor the temperature and vibration signal changes of the reducer to be tested during the test, and provide criteria for fault pre-diagnosis of the reducer to be tested.

[0052] 5、The test method of the test bench can not only accurately calculate the equivalent life of the reducer to be tested, but also calculate the real-time transmission efficiency of the reducer to be tested, and observe the degradation of the reducer to be tested through the change of the efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 It is a structural schematic view of a test bench for testing the equivalent life of a reducer according to an embodiment of the present application.

[0054] Figure 2 It is a partial sectional view of an embodiment of the present application.

[0055] Figure 3 It is Figure 2 It is an enlarged view of A in FIG. 6.

[0056] Figure 4 It is a burst shot of the inertia disc according to an embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to facilitate those skilled in the art to understand the technical scheme of the present application, the technical scheme of the present application will be further described in conjunction with the drawings of the present application.

[0058] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0059] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0060] ReferenceFigure 1 The embodiment discloses a test bench for testing equivalent life of a reducer, which comprises a fixing base 1 and a testing device 2 fixed on the fixing base 1.

[0061] The fixing base 1 comprises a base 11, a support frame 12 and a mounting plate 13, the support frame 12 is symmetrically fixed at both ends of the base 11, the mounting plate 13 is arranged through the support frame 12 on the support frame 12, and the testing device 2 is symmetrically fixed on the two symmetric mounting plates 13, so that the testing devices 2 can be counterweights, and the single fixing base 1 is prevented from being overturned due to uneven force.

[0062] Referring to Figure 2 and Figure 3 , the testing device 2 comprises a driving motor 21, a reducer to be tested 22, a self-centering mechanism 23, an inertia disc 24, a reducer output flange 25, a torque sensor 26, an angular acceleration sensor 27, a temperature sensor 28 and a vibration sensor 29, the driving motor 21 is vertically fixed on one side of the mounting plate 13 opposite to the other side, the reducer to be tested 22 is vertically fixed on the other side of the mounting plate 13 through the self-centering mechanism 23 and can rotate, and an output shaft of the driving motor 21 is coaxially connected with an input end of the reducer to be tested 22, an output end of the reducer to be tested 22 is coaxially fixed with the center of the inertia disc 24 through the reducer output flange 25, the torque sensor 26 is arranged on the output shaft of the driving motor 21, and the angular acceleration sensor 27 is arranged on the center of the inertia disc.

[0063] The test bench of the application can simulate actual working conditions of the reducer, such as repeated start-stop and reciprocating motion of a robot, without changing the failure mechanism of the reducer to be tested 22, by applying a load to the output end of the reducer to be tested 22 through the inertia disc 24, i.e. driving the driving motor 21 to drive the reducer to be tested 22 to make forward and reverse acceleration-deceleration motion, so that the output end of the reducer to be tested 22 drives the inertia disc 24 to make reciprocating swing motion, and finally the fatigue life test of the reducer is completed through equivalent calculation of the load working condition and the running time.

[0064] Meanwhile, since the output end of the reducer to be tested 22 is coaxially fixed with the center of the inertia disc 24, the load applied to the reducer to be tested 22 only comprises inertial load and does not comprise gravity eccentric load, the stress condition is simple, the test period is short, the calculation of equivalent moment is simplified, the equivalent life of the actual running time of the reducer to be tested 22 can be accurately calculated, and for load test exceeding the allowable torque of the reducer to be tested 22 during start-stop, only the parameters of the loading curve need to be changed to realize the load test, the performance requirement of the driving motor 21 is not high, and therefore instantaneous large torque working conditions such as impact can also be simulated.

[0065] In addition, it is also necessary to point out that, when the swing arm test bench is used to test the equivalent life of the reducer 22, the load is mainly inertia load and gravity eccentric load, so the swing arm needs to be moved to a certain height to obtain the gravity eccentric load in order to load the movement. In order to ensure the accuracy of the load, the swing arm needs to be specially calibrated to zero and the rotation angle. Since the load on the test bench of the application is only inertia load and does not include gravity eccentric load, the inertia disc 24 can be rotated to any position as the starting position, and zero calibration and rotation angle calibration are not required, which greatly saves the hardware investment cost of the test bench.

[0066] The output shaft of the driving motor 21 is rigidly connected with the input end of the reducer 22 by using a rigid coupling. Compared with a flexible coupling, the test system can avoid introducing a flexible link, and the synchronism of the input end of the reducer 22 and the output shaft of the driving motor 21 can be ensured, and the hysteresis of the inertia load is reduced.

[0067] The self-centering mechanism 23 includes a wedge-shaped outer ring 231, a wedge-shaped inner ring 232, and a self-centering flange 233. The inner wall of the wedge-shaped outer ring 231 is tapered. The wedge-shaped outer ring 231 is fixed on the mounting plate 13. The outer wall of the wedge-shaped inner ring 232 is tapered. The wedge-shaped inner ring 232 is further provided with a ring flange on the side close to the reducer 22. The wedge-shaped inner ring 232 is matched with the wedge-shaped outer ring 231 and is fixed on the side of the wedge-shaped outer ring 231 close to the reducer 22 through the ring flange and locking bolts (not marked in the figure). The self-centering flange 233 is rotatably sleeved in the wedge-shaped inner ring 232. The reducer 22 is coaxially fixed on the self-centering flange 233. The output shaft of the driving motor 21 penetrates the self-centering flange 233 and is connected with the output end of the reducer 22. Since the driving motor 21 and the reducer 22 are installed on the same mounting plate 13 through the self-centering mechanism 23, the centering error of the reducer 22 and the input shaft system is ensured, the installation precision requirement of the reducer 22 is met, the reducer 22 works under the optimal installation condition, the problems such as aggravation of bearing wear of the reducer 22, low transmission efficiency, and early damage are avoided, and the equivalent life of the reducer 22 is not misjudged.

[0068] In addition, the self-centering flange 233 of different specifications is designed for different specifications of the mounting plate 13, and the manufacturing cost is lower. Specifically, when testing different specifications of the reducer, if different specifications of the mounting plate 13 are used, the driving motor 21 needs to be removed and reassembled, and the driving motor 21 and the mounting plate 13 and the reducer 22 to be tested and the mounting plate 13 need to be adjusted twice. If the self-centering flange 233 of different specifications is used, the mounting plate 13 remains unchanged, and only the self-centering flange 233 and the reducer 22 to be tested need to be replaced, and the driving motor 1 and the mounting plate 13 do not need to be removed and replaced. The self-centering flange 233 is mounted on the mounting plate 13 through the cooperation of the wedge-shaped outer ring 231 and the wedge-shaped inner ring 232, and the concentricity of the two can be ensured, and the mounting is fast and convenient. Therefore, only one mechanical stop error adjustment of the reducer 22 to be tested and the self-centering flange 233 is needed during assembly, and the workload is reduced.

[0069] Referring to Figure 4 The inertia disc 24 includes a basic inertia disc 241 and an auxiliary inertia disc 242. The basic inertia disc 241 is connected to the output end of the reducer 22 through the reducer output flange 25. A plurality of auxiliary inertia discs 242 are fixed on the basic inertia disc 241. The auxiliary inertia disc 242 is a circular ring and is coaxially fixed on the basic inertia disc 241. The number of the auxiliary inertia discs 242 can be changed to meet the loading requirements of different reducers under different load conditions, so that the test bench has strong applicability.

[0070] A plurality of temperature sensors 28 are arranged on the housing of the reducer 22 to be tested. In this embodiment, the temperature sensors 28 are three magnetic temperature sensors and are uniformly distributed on the housing where the main bearing of the reducer 22 to be tested is located. The temperature sensors 28 are used to monitor the temperature change of the reducer 22 to be tested during testing and provide criteria for fault pre-diagnosis of the reducer 22 to be tested.

[0071] A vibration sensor 29 is arranged on the housing of the reducer 22 to be tested. In this embodiment, the vibration sensor 29 is a three-direction vibration sensor and is arranged on the bottom of the housing closest to the main bearing load area of the reducer 22 to be tested. The vibration sensor 29 is used to monitor the vibration signal change of the reducer 22 to be tested and provide criteria for fault pre-diagnosis of the reducer.

[0072] The test method of the test bench for testing the equivalent life of the reducer is also disclosed in this embodiment, which includes the following steps:

[0073] Step 1: After the installation of the reducer to be tested is completed, the driving motor is driven to drive the reducer to be tested and the inertia disc to rotate, and the torque T1 of the input end of the reducer to be tested and the angular acceleration ε of the inertia disc are measured through the torque sensor and the angular acceleration sensor.

[0074] Step 2: Since the output end of the reducer to be tested is coaxially fixed with the center of the inertia disc, the load applied to the reducer to be tested only contains inertial load, without gravity eccentric load, i.e. the output end torque of the reducer to be tested T = J · ε, wherein:

[0075] J - rotational inertia of the circular inertia disc;

[0076] ε - angular acceleration of the inertia disc;

[0077] Step 3: Calculate the equivalent life t according to the equivalent life calculation formula, i.e.:

[0078] wherein:

[0079] t0 - design life under rated torque;

[0080] n0 - rated rotational speed of the output end;

[0081] T0 - rated torque of the output end;

[0082] n m - average rotational speed of the output end during the test;

[0083] n m = ∑t i n i / ∑t i ;

[0084] T m - average load torque of the output end during the test;

[0085]

[0086] e - life index;

[0087] Step 4: Calculate the transmission efficiency η according to the transmission efficiency calculation formula, i.e.:

[0088] wherein:

[0089] J - rotational inertia of the circular inertia disc;

[0090] ε - angular acceleration of the inertia disc;

[0091] T1 - input end torque of the reducer to be tested;

[0092] i - reduction ratio of the reducer to be tested.

[0093] Through the above steps, it is known that the test method of the test bench can not only accurately calculate the equivalent life of the reducer 22 already running time, but also calculate the real-time transmission efficiency of the reducer 22, and observe the degradation of the reducer 22 through the change of the efficiency.

[0094] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are considered in all respects to be illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes coming within the meaning and equivalency range of the claims are intended to be embraced therein and no appended claim is to be considered as limiting as to the subject matter recited in that claim.

[0095] The above-described embodiments are merely exemplary implementations of the application, and the protection scope of the application is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the application, and these are within the protection scope of the application.

Claims

1. A test bench for testing the equivalent life of a speed reducer, characterized in that: Includes a mounting base and a testing device fixed on the mounting base; The testing device includes a drive motor, a reducer under test, an inertia disk, a torque sensor, and an angular acceleration sensor. The drive motor is fixed on a fixed base. The reducer under test is rotatably fixed on the side of the fixed base away from the drive motor, and the output shaft of the drive motor is coaxially connected to the input end of the reducer under test. The output end of the reducer under test is coaxially fixed to the center of the inertia disk. The torque sensor is set on the output shaft of the drive motor, and the angular acceleration sensor is set on the inertia disk. The reducer under test is rotatably fixed to a fixed base by a self-centering mechanism. The self-centering mechanism includes a wedge-shaped outer ring, a wedge-shaped inner ring, and a self-centering flange. The inner wall of the wedge-shaped outer ring is conical, and the outer ring is fixed to the fixed base. The outer wall of the wedge-shaped inner ring is also conical. The side of the wedge-shaped inner ring closest to the reducer under test is also provided with a flange. The wedge-shaped inner ring and the wedge-shaped outer ring cooperate with each other and are fixed to the side of the wedge-shaped outer ring closest to the reducer under test by locking bolts passing through the flange. The self-centering flange is rotatably fitted inside the wedge-shaped inner ring. The reducer under test is coaxially fixed to the self-centering flange. The output shaft of the drive motor passes through the self-centering flange and connects to the output end of the reducer under test. Different self-centering flanges are designed for reducers of different specifications.

2. The test bench for testing the equivalent life of a speed reducer according to claim 1, characterized in that: The test device is symmetrically fixed at both ends of the mounting base.

3. The test bench for testing the equivalent life of a speed reducer according to claim 2, characterized in that: The fixed base includes a base, a support frame, and a mounting plate. The support frame is symmetrically fixed at both ends of the base. The support frame is provided with a mounting plate that penetrates the support frame. The drive motor is fixed on the opposite side of the mounting plate, and a rotatable reducer to be tested is fixed on the opposite side of the mounting plate.

4. The test bench for testing the equivalent life of a reducer according to claim 1, characterized in that: The inertia disk includes a basic inertia disk and auxiliary inertia disks. The basic inertia disk is connected to the output end of the reducer under test, and multiple auxiliary inertia disks are also fixed on the basic inertia disk.

5. The test bench for testing the equivalent life of a reducer according to claim 4, characterized in that: The auxiliary inertia disk is a ring and is fixed coaxially with the central axis of the base inertia disk on the base inertia disk.

6. The test bench for testing the equivalent life of a reducer according to claim 4, characterized in that: The output end of the reducer under test is connected to the base inertia disk through the reducer output flange.

7. The test bench for testing the equivalent life of a speed reducer according to claim 1, characterized in that: Multiple temperature sensors are also installed on the housing of the reducer under test.

8. The test bench for testing the equivalent life of a reducer according to claim 1, characterized in that: A vibration sensor is also installed on the housing of the reducer under test.

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