Speed reducer reliability test bench

Abstract

The invention discloses a speed reducer reliability test bed which comprises a base, a support, a cantilever, a hanging basket and an oil cylinder. The support is hinged to the base, and the oil cylinder is hinged between the base and the support so as to drive the support to pitch on the base; a first connecting structure is arranged on the support and is used for connecting a fixed end of a tested speed reducer; a second connecting structure is arranged at the first end of the cantilever and is used for being connected with the rotary output end of the tested speed reducer; and the hanging basket is hung at the second end of the cantilever. The device is applied to the field of speed reducer testing, simulation testing of the speed reducer under different postures and different loads when the speed reducer is used on the crank arm rock drilling trolley can be effectively met, and low cost and safety are kept while high testing efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of speed reducer testing, in particular to a speed reducer reliability test bench. Background Art

[0002] Articulated boom drilling rigs are widely used because they are more suitable for domestic construction methods. During the construction of the drilling rig, the posture of the reducer changes at different angles between the horizontal and vertical according to the position of different construction holes, and the load on the reducer is also different during the construction of different holes. As a key component of the articulated boom drilling rig, its reliability is particularly important during the articulated boom drilling construction process.

[0003] At present, the reliability test of the crank arm rock drilling machine is usually carried out by installing it at the corresponding position of the main machine to carry out various tests. This test method needs to be tested on different complete machines and different positions, and due to the limitation of the construction terrain, it is impossible to carry out tests with different postures and different loads. It is difficult to carry out full-cycle reliability tests, and the test cost is high and the efficiency is low. At the same time, the test installed on the main machine will be affected by the construction environment, which will lead to poor safety of the test. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides a reducer reliability test bench, which can effectively meet the simulation test of the reducer under different postures and different loads when used on a crank arm drilling rig, while maintaining low cost and safety while having high test efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides a reducer reliability test bench, comprising a base, a support, a cantilever, a hanging basket and an oil cylinder; The support is hinged on the base, and the oil cylinder is hinged between the base and the support to drive the support to pitch on the base; The support is provided with a first connecting structure for connecting to the fixed end of the reducer under test; The first end of the cantilever is provided with a second connection structure for connecting to the rotation output end of the reducer under test; The hanging basket is suspended at the second end of the cantilever.

[0006] In one embodiment, limit switches are provided on the support at positions corresponding to both sides of the first connecting structure; When the cantilever rotates following the tested reducer, the limit switch is located on the rotation path of the cantilever.

[0007] In one embodiment, the reducer reliability test bench further includes a first control valve group, wherein the first control valve group is electrically connected to the limit switch and the reduced speed machine under test respectively; The first control valve group has a first powered end and a second powered end. When the first powered end is powered and the second powered end is powered off, the tested reducer rotates forward. When the first powered end is powered off and the second powered end is powered on, the tested reducer rotates reversely. When one of the limit switches is triggered, the first powered end is powered and the second powered end is de-powered; When the other limit switch is triggered, the first powered end loses power and the second powered end gains power.

[0008] In one embodiment, the reducer reliability test bench further includes a counter to count the number of times the first powered end and the second powered end are powered on and / or powered off.

[0009] In one embodiment, the reducer reliability test bench further includes a hydraulic system, wherein the hydraulic system is connected to the oil cylinder and the reducer under test to drive the oil cylinder to extend and retract and the reducer under test to rotate.

[0010] In one embodiment, the hydraulic system includes an oil tank, an oil cylinder balancing valve, a reducer balancing valve, a second control valve group, a pressure sensor and the first control valve group, and an oil inlet and an oil return path are provided between the oil tank and the oil cylinder and the reducer under test; The first control valve group and the reducer balancing valve are arranged on the oil inlet and oil return lines between the oil tank and the tested reducer; The second control valve group and the oil cylinder balance valve are arranged on the oil inlet and oil return paths between the oil tank and the oil cylinder; A feedback oil circuit is also provided between the first control valve group, the second control valve group and the oil tank; The pressure sensor is arranged on the feedback oil circuit, the high-pressure side of the tested reducer and / or the low-pressure side of the tested reducer, so as to measure the working oil pressure of the feedback oil circuit, the high-pressure side pressure of the tested reducer when it is running and / or the low-pressure side pressure of the tested reducer when it is running.

[0011] In one embodiment, stoppers are provided on the support at positions corresponding to both sides of the first connecting structure; The limit switch is located between the first connecting structure and the stopper on the same side.

[0012] In one of the embodiments, the reducer reliability test bench further includes a pitch detection mechanism for obtaining the pitch angle of the support on the base.

[0013] In one embodiment, the pitch detection mechanism is an inclination sensor provided on the support; or The pitch detection mechanism is a displacement sensor arranged on the oil cylinder.

[0014] In one embodiment, the reducer reliability test bench also includes a torque sensor and an angle sensor. The torque sensor and the angle sensor are arranged on the reducer under test to measure the torque and the rotation speed of the reducer under test during operation.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: 1. The present invention arranges a pitchable support on the base, arranges the test reducer on the support and then connects the cantilever, simulates the structural layout of the test reducer on the crank arm drilling trolley, and uses the oil cylinder to drive the support to pitch to simulate the actual working condition of the test reducer, which can effectively meet the simulation test of the reducer under different postures and different loads when used on the crank arm drilling trolley; 2. In the preferred solution of the present invention, a limit switch is arranged on the support, and the first control valve group is cooperated to realize the automatic reversing of the tested reducer, so that the tested reducer can automatically operate during the reliability test, meeting the automatic test requirements of the reducer throughout its life cycle. It is further preferred that the reversing times of the tested reducer can be automatically counted by a counter; 3. In the preferred embodiment of the present invention, a pressure sensor is arranged in the hydraulic system, and the working oil pressure, the high-pressure side pressure and / or the low-pressure side pressure of the tested reducer when the tested reducer is running are measured by the pressure sensor to monitor the reliability test of the tested reducer, so as to stop the test and / or notify the staff when the measured pressure is abnormal, thereby improving the safety during automatic testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 It is a front view of the reducer reliability test bench in the embodiment of the present invention; Figure 2 A partial diagram of a reducer reliability test bench in an embodiment of the present invention; Figure 3 This is an example diagram of load calculation of a reducer reliability test bench in an embodiment of the present invention; Figure 4 A schematic diagram of an oil tank end of a hydraulic system in an embodiment of the present invention; Figure 5 Schematic diagram of a control execution end in a hydraulic system in an embodiment of the present invention.

[0018] Figure numbers: base 1, support 2, cantilever 3, hanging basket 4, oil cylinder 5, test reducer 6, limit switch 7, first control valve group 8, oil tank 9, cylinder balance valve 10, reducer balance valve 11, second control valve group 12, oil suction filter 13, oil drain ball valve 14, oil drain filter 15, variable pump 16, overflow valve 17, outlet filter 18, return oil filter 19, temperature sensor 20, liquid level switch 21.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] like Figure 1 , Figure 2 The figure shows a reducer reliability test bench disclosed in the present embodiment, which mainly includes a base 1, a support 2, a cantilever 3, a hanging basket 4 and a cylinder 5. The support 2 is hinged on one side of the top of the base 1, and the cylinder 5 is located below the support 2 and hinged between the base 1 and the support 2, so that the cylinder 5 can drive the support 2 to perform a pitching motion on the base 1 by telescoping. A first connecting structure, such as a plurality of bolt holes, is provided on the support 2 for connecting the fixed end of the test reducer 6; a second connecting structure, such as a coupling, is provided at the first end of the cantilever 3 for connecting the rotating output end of the test reducer 6, and the hanging basket 4 is suspended at the second end of the cantilever 3. That is, the support 2, the test reducer 6, the cantilever 3 and the hanging basket 4 are connected in sequence, and the test reducer 6 pitches with the support 2, and the test reducer 6 can drive the cantilever 3 to swing left and right.

[0026] In this embodiment, the hanging basket 4 can adjust the load size of the test reducer 6 through different counterweights to meet the different working conditions of the test reducer 6 when used in different rock drilling machines. For example, it is known that the distance between the hanging point of the cantilever 3 and the rotation center of the test reducer 6 is 2m, the weight of the cantilever 3 is 200kg, the center of gravity is 1m away from the rotation center of the test reducer 6, the weight of the hanging basket 4 is 100kg, and the gravity acceleration g=10; Figure 2 In the posture shown, the working condition of the crank arm rock drilling rig is simulated, and the hanging weight when the test reducer 6 bears the maximum load of 14kN.m is calculated. The maximum torque generated by the hanging weight, the weight of the hanging basket 4, and the load of the cantilever 3 is 14kN.m. After calculation, it can be obtained that the weight required to be carried is 500kg, and a 500kg counterweight block needs to be placed during the fall to simulate the working condition of the actual crank arm rock drilling rig.

[0027] Therefore, this embodiment arranges a pitchable support 2 on the base 1, arranges the test reducer 6 on the support 2 and then connects the cantilever 3, simulates the structural layout of the test reducer 6 on the crank arm drilling trolley, and uses the cylinder 5 to drive the support 2 to pitch to simulate the actual working condition of the test reducer 6, which can effectively meet the simulation test of the reducer under different postures and different loads when used on the crank arm drilling trolley. At the same time, the overall structure is relatively simple and the cost is low.

[0028] refer to Figure 2, limit switches 7 are provided on the support 2 at positions corresponding to both sides of the first connection structure. When the cantilever 3 rotates following the tested reducer 6, the limit switch 7 is located on the rotation path of the cantilever 3. When the cantilever 3 rotates to one side of the support 2 and triggers the limit switch 7 on that side, the upper computer can control the tested reducer 6 to rotate in the opposite direction until another limit switch 7 is triggered, and this reciprocating operation can meet the automatic test requirements of the full life cycle of the tested reducer 6. Among them, the upper computer can use a controller such as PLC.

[0029] In the specific implementation process, the reducer reliability test bench also includes a first control valve group 8, which is electrically connected to the two limit switches 7 and the test reducer 6 through the host computer. The first control valve group 8 has a first power-on end and a second power-on end. When the first power-on end is powered and the second power-on end is de-energized, the test reducer 6 rotates forward, and when the first power-on end is de-energized and the second power-on end is powered, the test reducer 6 reverses; at the same time, in the two limit switches 7, when one of the limit switches 7 is triggered, the first power-on end is powered and the second power-on end is de-energized, and when the other limit switch 7 is triggered, the first power-on end is de-energized and the second power-on end is powered, thereby realizing the automatic test requirements of the full life cycle of the test reducer. Among them, the first control valve group 8 can adopt a proportional reversing valve or other solenoid valve.

[0030] As a preferred embodiment, the reducer reliability test bench also includes a counter to count the number of times the first powered end and the second powered end are powered and / or de-powered, wherein the counter can be a manual counter or an automatic counter. When the counter is an automatic counter, the counter is electrically connected to the first control valve group 8 through the host computer. Assuming that the tested reducer 6 starts to rotate from left to right, the first powered end is powered at this time, and the tested reducer 6 starts to rotate from left to right. When the tested reducer 6 runs to the right, that is, the limit switch 7 on the right senses it, the limit switch 7 on the right feeds back the in-position signal to the host computer, and the host computer sends an instruction to the first control valve group 8 to make the first powered end de-powered and the second powered end powered. At the same time, the number of times the tested reducer 6 moves in the counter is counted. The number is increased by 1, and the reducer 6 under test is reversed, that is, it rotates from right to left; similarly, when it runs to the left limit switch 7, the left limit switch 7 feeds back the arrival signal to the host computer, and the host computer sends a command to the first control valve group 8 to make the second power-on end lose power and the first power-on end energize. At the same time, the total number of actions of the reducer 6 under test in the counter is increased by 1, and the reducer reverses, that is, it rotates from left to right; this cycle is repeated to realize the automatic action of the reliability test of the reducer 6 under test, automatic reversal, and automatic counting of the number of actions. Among them, the automatic counter can adopt the conventional form sold on the market, and its implementation method and operation principle are conventional technical means, which will not be repeated in this embodiment.

[0031] It is worth noting that in specific applications, it is not limited to counting the number of actions of the test reducer 6 by energizing the first energized end and the second energized end, and it can also be achieved by presetting the power-on and power-off time of the first energized end and the second energized end. For example, in the upper computer, it is set that the power-on time is 3 seconds and the power-off time is 2 seconds as a cycle. After one cycle, the total number of test actions of the test reducer 6 is increased by 1. The specific implementation principle is: assuming that the test reducer 6 starts to rotate from left to right, the upper computer outputs a current signal to control the first control valve group 8 to energize the first energized end for 3 seconds, the test reducer 6 starts to rotate from left to right, stops after 3 seconds, and then loses power for 2 seconds. The test reducer 6 stops for 2 seconds. After one cycle is completed, the number of actions of the test reducer 6 is increased by 1, and then it automatically enters the next cycle, that is, power-on for 3 seconds and power-off for 2 seconds. When the test reducer 6 runs to the right, that is, the right limit switch 7 When sensed, the limit switch 7 on the right feeds back the in-position signal to the host computer, and the host computer sends an instruction to the first control valve group 8 to make the first powered end lose power, while the second powered end is powered, and then the tested reducer 6 reverses, that is, rotates from right to left; the host computer outputs a signal to control the second powered end of the first control valve group 8 to be powered for 3 seconds, and the tested reducer 6 starts to rotate from right to left, stops after 3 seconds, and then loses power for 2 seconds. The tested reducer 6 stops for 2 seconds, and the number of test actions is increased by 1 accordingly after one cycle is completed; this cycle is repeated to realize the automatic action of the reliability test of the tested reducer 6, automatic reversing, and automatic counting of the number of actions.

[0032] The reducer reliability test bench in this embodiment further includes a hydraulic system, which is connected to the oil cylinder 5 and the reducer under test 6 respectively to drive the oil cylinder 5 to extend and retract and the reducer under test 6 to rotate. Specifically, the hydraulic system includes an oil tank 9, a cylinder balance valve 10, a reducer balance valve 11, a second control valve group 12, a pressure sensor and a first control valve group 8. There is an oil inlet and an oil return between the oil tank 9 and the oil cylinder 5 and the test reducer 6. The first control valve group 8 and the reducer balance valve 11 are arranged on the oil inlet and oil return between the oil tank 9 and the test reducer 6. The second control valve group 12 and the cylinder balance valve 10 are arranged on the oil inlet and oil return between the oil tank 9 and the oil cylinder 5. There is also a feedback oil circuit between the first control valve group 8, the second control valve group 12 and the oil tank 9. The pressure sensor is arranged on the feedback oil circuit, the high pressure side of the test reducer 6 and / or the low pressure side of the test reducer 6 to measure the working oil pressure of the feedback oil circuit, the high pressure side pressure of the test reducer 6 when the test reducer 6 is running and / or the low pressure side pressure of the test reducer 6 when the test reducer 6 is running. Among them, the second control valve group 12 can use the same proportional reversing valve as the first control valve group 8, which is mainly used to control the extension and contraction of the oil cylinder 5.

[0033] The hydraulic system in this embodiment is as follows Figure 4 , Figure 5 As shown, L02 represents the oil inlet circuit, L03 represents the feedback oil circuit, and L04 represents the oil return circuit.

[0034] Figure 4 In the figure, the oil tank 9 is used to store hydraulic oil, the oil suction filter 13 is connected to the oil suction steel pipe by threads, and the sucked oil will be filtered by it. The drain ball valve 14 is connected to the oil tank 9 by threads. When the oil needs to be changed, the oil in the oil tank 9 can be emptied through this drain ball valve 14. The oil leakage filter 15 is connected to the oil tank 9 by threads, and the oil leaked from the oil pump housing will flow back to the oil tank 9 through the oil leakage filter, playing the role of filtering impurities. The variable pump 16 outputs oil to the first control valve group 8 and the second control valve group 12, and can change the displacement by changing its own swash plate swing angle, and then change the outflow displacement. The change in flow rate changes the pressure of the pump port, and the pump port pressure is maintained to be larger than the feedback port pressure fed back. The overflow valve 17 is superimposed on the pump outlet, and the overflow pressure is adjustable. Its set pressure ensures that the system will not be damaged due to excessive pressure. Its M1 port is connected to a pressure gauge to observe the system pressure. The outlet filter 18 is connected to the overflow valve block through a hose, and plays a filtering role to ensure that the lower valve block and components will not be stuck due to contamination. The return oil filter 19 is connected to the oil tank 9 through a thread, and the return oil of the hydraulic actuator is filtered through it before returning to the oil tank 9. The temperature sensor 20 extends into the oil tank 9 to detect the hydraulic oil temperature. The liquid level switch 21 issues an alarm for insufficient hydraulic oil when the hydraulic oil is lower than the set liquid level.

[0035] Figure 5 In the test, the first control valve group 8 and the second control valve group 12 are connected to the upper power element and the lower actuator through hoses respectively. They can input current through the program to control the flow input to the actuator, thereby controlling the speed of the test reducer 6 and the extension and contraction of the cylinder 5, and the action frequency meets the test requirements, such as controlling the test reducer to perform 5000 back and forth actions a day, and controlling the cylinder 5 to extend 30cm. The feedback oil circuit is used to feedback the working oil pressure to the pump to stabilize the pressure difference before and after the valve and stabilize the working flow; the cylinder balance valve 10 plays a role in maintaining the load of the cylinder 5, preventing malfunctions caused by external disturbances, and improving the operating stability; the reducer balance valve 11 plays a role in maintaining the load of the reducer, preventing malfunctions caused by external disturbances, and improving the operating stability.

[0036] In this embodiment, there are three main pressure sensors in the hydraulic system, namely Figure 5Pa, Pb and Ps in the figure, where the pressure sensor Ps is used to monitor the feedback working oil pressure, and the pressure sensors Pa and Pb respectively monitor the pressures on the high and low pressure sides of the test reducer 6 when it is running, and the difference between them is the pressure difference when the test reducer 6 is running. When the flow meter Q1 for detecting the flow rate is simultaneously monitored and fed back to the host computer, the power P1 of the test reducer 6 can be obtained. In addition, the oil flow rate of the flow meter detection circuit and the values ​​of the two flow meters Q1 and Q2 can be used to obtain the volumetric efficiency of the test reducer 6. For example, when the test reducer 6 rotates forward (oil enters from port A and oil exits from port B), the volumetric efficiency of the test reducer 6 is (Q1-Q2) / Q1. Further preferably, the reducer reliability test bench also includes an angle sensor and a torque sensor. Among them, the angle sensor and the torque sensor are both arranged on the test reducer 6 to respectively measure the output speed and torque of the test reducer 6. The power P2 output to the execution end can be calculated based on the output speed and torque of the test reducer 6. Combined with the power P1 obtained by the flow meters Q1 and Q2, the efficiency P2 / P1 of the test reducer 6 can be obtained.

[0037] In the specific implementation process, the reducer reliability test bench also includes a pitch detection mechanism, which can be an inclination sensor arranged on the support 2, or a displacement sensor arranged on the cylinder 5, etc., to obtain the pitch angle of the support 2 on the base 1, thereby obtaining the pitch angle of the test reducer 6. The pitch angle is combined with the length of the cantilever 3 and the size of the lifting weight, that is, the axial torque and radial torque of the test reducer 6 at this angle posture can be calculated.

[0038] In this embodiment, blocks are provided on the support 2 at positions corresponding to both sides of the first connection structure, and the limit switch 7 is located between the first connection structure and the block on the same side. When the reducer 6 under test is automatically operated for a long time, the risk of damage to the limit switch 7 cannot be ruled out. When the limit switch 7 fails, the reducer 6 under test will be restricted from further rotating in one direction by the limit block during its rotation. At the same time, the two blocks are compressed, causing the working pressure of the first control valve group 8 to rise. Therefore, a threshold value can be set. When the working oil pressure monitored by the pressure sensor Ps exceeds the threshold value, the upper computer sends a command to make the first power-on end and the second power-on end lose power at the same time, preventing the reducer 6 under test from further operating. At the same time, an alarm can be issued to the staff through a buzzer, an indicator light, etc., thereby improving the safety during the automatic test.

[0039] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A reducer reliability test bench, characterized in that: Including base, support, cantilever, hanging basket and oil cylinder; The support is hinged on the base, and the oil cylinder is hinged between the base and the support to drive the support to pitch on the base; The support is provided with a first connecting structure for connecting to the fixed end of the reducer under test; The first end of the cantilever is provided with a second connection structure for connecting to the rotation output end of the reducer under test; The hanging basket is suspended at the second end of the cantilever.

2. The reducer reliability test bench according to claim 1, characterized in that: Limit switches are provided on the support at positions corresponding to both sides of the first connecting structure; When the cantilever rotates following the tested reducer, the limit switch is located on the rotation path of the cantilever.

3. The reducer reliability test bench according to claim 2, characterized in that: It also includes a first control valve group, which is electrically connected to the limit switch and the tested reducer respectively; The first control valve group has a first powered end and a second powered end. When the first powered end is powered and the second powered end is powered off, the tested reducer rotates forward. When the first powered end is powered off and the second powered end is powered on, the tested reducer rotates reversely. When one of the limit switches is triggered, the first powered end is powered and the second powered end is de-powered; When the other limit switch is triggered, the first powered end loses power and the second powered end gains power.

4. The reducer reliability test bench according to claim 3, characterized in that: The device further comprises a counter for counting the number of times the first powered end and the second powered end are powered on and / or powered off.

5. The reducer reliability test bench according to claim 3 or 4, characterized in that: It also includes a hydraulic system, which is connected to the oil cylinder and the tested reducer respectively to drive the oil cylinder to extend and retract and the tested reducer to rotate.

6. The reducer reliability test bench according to claim 5, characterized in that: The hydraulic system includes an oil tank, an oil cylinder balancing valve, a reducer balancing valve, a second control valve group, a pressure sensor and the first control valve group, and an oil inlet and an oil return path are provided between the oil tank and the oil cylinder and the reducer under test; The first control valve group and the reducer balancing valve are arranged on the oil inlet and oil return lines between the oil tank and the tested reducer; The second control valve group and the oil cylinder balance valve are arranged on the oil inlet and oil return paths between the oil tank and the oil cylinder; A feedback oil circuit is also provided between the first control valve group, the second control valve group and the oil tank; The pressure sensor is arranged on the feedback oil circuit, the high-pressure side of the tested reducer and / or the low-pressure side of the tested reducer, so as to measure the working oil pressure of the feedback oil circuit, the high-pressure side pressure of the tested reducer when it is running and / or the low-pressure side pressure of the tested reducer when it is running.

7. The reducer reliability test bench according to any one of claims 2 to 4, characterized in that: Stoppers are provided on the support at positions corresponding to both sides of the first connecting structure; The limit switch is located between the first connecting structure and the stopper on the same side.

8. The reducer reliability test bench according to any one of claims 1 to 4, characterized in that: It also includes a pitch detection mechanism for obtaining the pitch angle of the support on the base.

9. The reducer reliability test bench according to claim 8, characterized in that: The pitch detection mechanism is an inclination sensor provided on the support; or The pitch detection mechanism is a displacement sensor arranged on the oil cylinder.

10. The reducer reliability test bench according to any one of claims 1 to 4, characterized in that: It also includes a torque sensor and an angle sensor. The torsion sensor and the angle sensor are arranged on the tested reducer to measure the torque and the rotation speed of the tested reducer during operation.

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