Nested large-flow multi-stage pressure oil path distribution device of rotary loading test bed

Abstract

The application relates to a nested large-flow multi-stage pressure oil path distribution device of a rotary loading test bed, which comprises a front-stage oil path distribution device, a rear-stage oil path distribution device, an in-shaft nested multi-path pipeline and a multi-stage pressure oil supply system. The front-stage oil path distribution device is arranged at the head of the front stage of an oil path transmission outer shaft sleeve, the rear-stage oil path distribution device is arranged at the tail of the rear stage of the oil path transmission outer shaft sleeve, the front-stage oil path distribution device and the rear-stage oil path distribution device are connected through the in-shaft nested multi-path pipeline in the middle of the oil path transmission outer shaft sleeve, and the multi-path oil supply system is connected with the front-stage oil path distribution device through a hydraulic pipeline. The application utilizes the fluid transmission and hydraulic dynamic sealing principle, adopts the nested sealing and fluid transmission technology, transmits the power oil source of a fixed device to a rotary device, and provides the rotary electro-hydraulic servo loading system with a multi-path, large-flow and different pressure power oil source.

Description

Technical Field

[0001] This invention relates to a loading test device for electro-hydraulic servo systems, and more particularly to an oil circuit distribution device that provides a high-flow, multi-channel, multi-stage pressure power oil source for a rotating electro-hydraulic servo loading test bench. Background Technology

[0002] Loading test studies on rotating devices mainly focus on mechanical and electric loading, with the power source for electric loading transmitted via slip rings. However, there is limited information available both domestically and internationally on high-flow-rate, multi-channel, multi-stage pressure hydraulic circuit distribution devices based on hydraulic transmission. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench, which utilizes the nested oil circuit distribution and hydraulic transmission principle to provide the required multi-channel, high-flow-rate, multi-stage pressure power oil source for rotary electro-hydraulic loading test benches.

[0004] To achieve the above objectives, the technical solution of the present invention is: a nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench, comprising: a front oil circuit distribution device, a rear oil circuit distribution device, a multi-channel pipe nested within the shaft, and a multi-stage pressure oil supply system. The front oil circuit distribution device is arranged at the front end of the outer sleeve of the oil circuit transmission, and the rear oil circuit distribution device is arranged at the rear end of the outer sleeve of the oil circuit transmission. The front oil circuit distribution device and the rear oil circuit distribution device are connected through a multi-channel pipe nested within the shaft in the middle of the outer sleeve of the oil circuit transmission. The multi-channel oil supply system is connected to the front oil circuit distribution device through a hydraulic pipeline.

[0005] Furthermore, the front-end oil circuit distribution device includes: a front-end external shaft oil circuit distribution device and a front-end internal shaft oil circuit distribution device, wherein: the front-end external shaft oil circuit distribution device further includes a low-pressure sealing assembly and a nested sealing assembly; the front-end external shaft oil circuit distribution device is arranged at the front end of the oil circuit transmission outer shaft sleeve and is fitted onto the outside of the shaft; the front-end internal shaft oil circuit distribution device is arranged at the front end of the oil circuit transmission outer shaft sleeve and is nested inside the oil circuit transmission outer shaft sleeve; the front-end external shaft oil circuit distribution device, along the shaft head direction, sequentially installs a sealing shaft sleeve, a bearing bushing, a low-pressure sealing assembly, a nested oil distribution sealing assembly, a positioning ring, and a head support shaft on the front end of the oil circuit transmission outer shaft sleeve. The housing consists of a front end cover and a first felt seal cover; the sealing bushing is fitted onto the rear boss of the front section of the oil passage transmission outer bushing and positioned by a sealing bushing locating pin; a bearing bushing is fitted side-by-side in the forward direction and positioned by a rear bearing locating pin; a rear support bearing is mounted on the bearing bushing; a locating ring is fitted onto the front section of the oil passage transmission outer bushing in the forward direction and fixed to the oil passage transmission outer bushing by a locating pin; the first support bearing is fitted onto the oil passage transmission outer bushing, close to the locating ring in the forward direction; the front and rear ends of the housing are fitted onto the first and rear support bearings; the rear end cover of the housing is fitted onto the sealing bushing and bolted to the upper and lower housings. The upper and lower housings are connected at their tail ends; the upper and lower housings are connected by housing bolts, the tail felt sealing cover is fitted onto the sealing bushing, close to the tail end of the housing tail end cover, and a tail felt sealing ring is provided between the tail felt sealing cover and the housing tail end cover. The tail felt sealing cover and the housing tail end cover are connected by bolts, and the tail felt sealing ring is pressed and fixed; the housing head end cover is fitted onto the shaft of the front section of the oil passage transmission outer bushing, and is connected to the head end of the upper and lower housings by bolts; the head felt sealing cover is fitted onto the shaft of the front section of the oil passage transmission outer bushing, close to the head end of the housing head end cover, and a head felt sealing ring is provided between the head felt sealing cover and the housing head end cover by bolts. The end cap is installed, and the first felt sealing ring is pressed and fixed. The low-pressure sealing assembly is arranged inside the upper and lower housings, fitted onto the tail of the front section of the oil passage transmission outer bushing, and connected to the low-pressure oil pipe and connector of the upper housing. The nested oil distribution sealing assembly is arranged inside the upper and lower housings, fitted onto the head of the front section of the oil passage transmission outer bushing, and connected to the high-pressure oil pipe and connector of the upper housing and the medium-pressure oil pipe and connector of the housing, respectively. An anti-rotation fixing pin is provided between the nested oil distribution sealing assembly and the low-pressure sealing assembly. The return oil pipe connector is arranged in the upper part of the upper housing and connected to the cooling oil pipe inside the housing. The return oil pipe connector is arranged in the lower part of the lower housing and connected to the external return oil circuit.

[0006] Furthermore, the low-pressure sealing ring of the low-pressure sealing assembly is fitted onto the front section of the oil circuit transmission outer bushing and placed at the rear of the upper and lower housings. The low-pressure sealing ring is provided with a front section oil distribution low-pressure chamber, which is connected to the housing low-pressure oil pipe and connector on the upper housing. A low-pressure sealing bearing alloy is provided between the low-pressure sealing ring and the oil circuit transmission outer bushing. An anti-rotation fixing pin is provided between the low-pressure sealing assembly and the high-pressure sealing assembly, and they are connected by bolts.

[0007] Furthermore, the pressure-bearing tail end cap of the nested oil distribution sealing assembly is placed inside the upper and lower housings, fitted onto the front section of the oil passage transmission outer bushing, and connected in the forward direction to the anti-rotation fixing pin of the low-pressure sealing assembly; the pressure-bearing housing is inside the housing, fitted onto the front section of the oil passage transmission outer bushing, and its tail end face is connected to the forward direction of the pressure-bearing tail end cap by bolts, forming the tail medium-pressure chamber of the nested oil distribution sealing assembly, and connected to the medium-pressure oil pipe joint; the cavity ring is fitted onto the oil passage transmission outer bushing, and is connected to the pressure-bearing housing respectively. The front end face of the body and the rear end face of the pressure-bearing front end cover are connected by bolts. A high-pressure chamber of the oil distribution sealing assembly is formed between the diaphragm ring and the pressure-bearing housing. The high-pressure chamber is connected to the high-pressure oil pipe and connectors of the housing. The diaphragm ring and the pressure-bearing front end cover form the first intermediate-pressure chamber of the oil distribution sealing assembly. A connecting hole is provided between the pressure-bearing housing and the diaphragm ring, connecting the first intermediate-pressure chamber and the rear intermediate-pressure chamber of the oil distribution sealing assembly, forming an intermediate-pressure chamber surrounding the high-pressure chamber. There are three intermediate-pressure sealing rings, which are fitted before the outer sleeve of the oil transmission circuit. On the segment, two are located in the tail-end intermediate pressure chamber of the oil distribution sealing assembly, and one is located in the head-end intermediate pressure chamber of the oil distribution sealing assembly. The tail-end intermediate pressure chamber of the oil distribution sealing assembly has two intermediate pressure sealing rings, one connected to the head end face of the pressure-bearing tail end cover, and the other close to the central boss of the pressure-bearing housing. A sealing spacer is provided between the two intermediate pressure sealing rings, and a bearing alloy is provided between the two intermediate pressure sealing rings and the oil passage transmission outer shaft sleeve. The head-end intermediate pressure chamber of the oil distribution sealing assembly has one intermediate pressure sealing ring, and a sealing spacer is provided between the intermediate pressure sealing ring and the cavity ring. A bearing alloy is provided between the intermediate pressure sealing ring and the oil passage transmission outer shaft sleeve. The high-pressure sealing ring, together with the sealing spacer, is fitted onto the front section of the oil passage transmission outer shaft sleeve and is located in the middle high-pressure chamber of the oil distribution sealing assembly. A bearing alloy is provided between the high-pressure sealing ring and the oil passage transmission outer shaft sleeve. The pressure-bearing head end cover, intermediate pressure sealing ring, high-pressure sealing ring, sealing spacer, pressure-bearing housing, cavity ring, and pressure-bearing tail end cover of the nested oil distribution sealing assembly are positioned by a sealing assembly positioning pin.

[0008] Furthermore, the front-end support copper bushing of the front-end shaft oil circuit distribution device is embedded in the front section of the oil circuit transmission outer bushing to the boss inside the shaft. The tail of the front-end support copper bushing is fitted onto the front section of the low-pressure oil pipe of the intermediate multi-way pipeline inside the shaft, and a shaft Y-type seal ring and an O-type seal ring are provided between the bushing and the low-pressure oil pipe. The boss of the front-end low-pressure sealing sleeve ring is embedded in the front section of the low-pressure oil pipe and the medium-pressure oil pipe of the intermediate multi-way pipeline inside the shaft, and is connected to the low-pressure oil pipe and the medium-pressure oil pipe. A Y-ring and an O-ring are installed between the oil pipes; the front-section medium-pressure oil guide bushing is nested in the middle of the front-section support copper bushing and is equipped with a Y-ring for the shaft. The tail end face of the front-section medium-pressure oil guide bushing is connected to the first end face of the front-section low-pressure sealing sleeve ring cover via a locating pin; the boss of the front-section medium-pressure sealing sleeve ring cover is embedded in the high-pressure oil pipe of the multi-channel pipeline in the middle of the shaft and the front-section medium-pressure oil guide bushing, and is positioned between the high-pressure oil pipe and the medium-pressure oil guide bushing. The device includes a Y-type seal and an O-type seal. The front high-pressure oil guide bushing is nested within the head of the front support copper bushing and is equipped with a Y-type seal. The tail end of the high-pressure oil guide bushing is connected to the first-facing end face of the intermediate-pressure sealing sleeve ring cover, and the tail-facing end face of the outer ring of the intermediate-pressure sealing sleeve ring cover is connected to the first-facing end face of the intermediate-pressure oil guide bushing via a locating pin. The front high-pressure sealing sleeve ring cover is fitted onto the oil pipe, with its boss embedded between the front high-pressure oil guide bushing and the oil pipe. A Y-type seal and an O-type seal are provided between the oil pipe and the high-pressure oil guide bushing. The tail-facing end face of the high-pressure sealing sleeve ring cover and the first-facing end face of the high-pressure oil guide bushing are connected and positioned via a locating pin. The oil pipe shaft seal head end cover is fitted onto the outer oil pipe and connected to the head end of the oil passage transmission outer bushing via screws. A Y-type seal and an O-type seal are provided between the oil pipe shaft seal head end cover and the outer oil pipe, and an O-type seal is provided between the oil pipe shaft seal head end cover and the oil passage transmission outer bushing.

[0009] Furthermore, the rear support copper bushing of the rear oil circuit distribution device is embedded in the rear section of the oil circuit transmission outer bushing to the boss inside the shaft. The first part of the rear support copper bushing is fitted onto the rear section of the low-pressure oil pipe of the intermediate multi-channel pipeline inside the shaft, and a shaft Y-type seal ring and an O-type seal ring are provided between the bushing and the low-pressure oil pipe. The boss of the rear low-pressure sealing sleeve ring cover is embedded in the rear section of the low-pressure oil pipe and the medium-pressure oil pipe of the intermediate multi-channel pipeline inside the shaft, and is connected to the low-pressure oil pipe and the medium-pressure oil pipe. A Y-type seal and an O-type seal are provided between the pipes; the rear-section medium-pressure oil guide bushing is nested in the middle of the rear-section supporting copper bushing and is provided with a Y-type seal. The first end face of the rear-section medium-pressure oil guide bushing is connected to the tail end face of the rear-section low-pressure sealing sleeve ring cover by a positioning pin; the boss of the rear-section medium-pressure sealing sleeve ring cover is embedded in the rear-section high-pressure oil pipe and the rear-section medium-pressure oil guide bushing, and a Y-type seal is provided between the boss and the high-pressure oil pipe and the medium-pressure oil guide bushing. The rear high-pressure oil guide sleeve is nested at the tail of the rear support copper bushing and is equipped with a shaft Y-type seal. The first end face of the rear high-pressure oil guide sleeve and the tail end face of the intermediate pressure sealing sleeve ring cover, and the first end face of the outer ring of the intermediate pressure sealing sleeve ring cover and the tail end face of the intermediate pressure oil guide sleeve are connected by a positioning pin. The rear high-pressure sealing sleeve ring cover is fitted onto the oil pipe, and its boss is embedded between the rear high-pressure oil guide sleeve and the oil pipe. A shaft Y-type seal and an O-type seal are provided between the oil pipe and the high-pressure oil guide sleeve. The first end face of the rear high-pressure sealing sleeve ring cover and the tail end face of the high-pressure oil guide sleeve are connected and positioned by a positioning pin. The oil pipe shaft sealing tail end cover is fitted onto the outer oil pipe and is connected to the tail end of the oil passage transmission outer sleeve by screws. A shaft Y-type seal and an O-type seal are provided between the oil pipe shaft sealing tail end cover and the outer oil pipe, and an O-type seal is provided between the oil passage transmission outer sleeve and the oil pipe shaft sealing tail end cover.

[0010] Furthermore, the front section of the low-pressure oil pipe of the multi-channel pipeline within the shaft is embedded in the tail of the front support copper bushing, with the first end face of the low-pressure oil pipe abutting against the tail-to-end face of the outer ring of the front low-pressure sealing sleeve cover; the rear section of the low-pressure oil pipe is embedded in the head of the rear support copper bushing, with the tail end face of the low-pressure oil pipe abutting against the head-to-end face of the outer ring of the rear low-pressure sealing sleeve cover; the front section of the medium-pressure oil pipe is embedded in the boss of the front low-pressure sealing sleeve cover, with the first end face of the medium-pressure oil pipe abutting against the tail-to-end face of the inner ring of the front low-pressure sealing sleeve cover; the rear section of the medium-pressure oil pipe... The low-pressure oil pipe is embedded in the boss of the rear section low-pressure sealing sleeve cover, and the tail end face of the medium-pressure oil pipe abuts against the first end face of the inner ring of the rear section low-pressure sealing sleeve cover; the front section of the high-pressure oil pipe is embedded in the boss of the front section medium-pressure sealing sleeve cover, and the first end face of the high-pressure oil pipe abuts against the tail end face of the inner ring of the front section medium-pressure sealing sleeve cover; the rear section of the high-pressure oil pipe is embedded in the inner ring of the rear section medium-pressure sealing sleeve cover, and the tail end face of the high-pressure oil pipe abuts against the first end face of the inner ring of the rear section medium-pressure sealing sleeve cover; a return oil pipeline is formed between the low-pressure oil pipe and the oil circuit transmission outer bushing;

[0011] Furthermore, the multi-channel oil supply system includes a stainless steel oil tank, which is connected to a hydraulic pump unit and a return oil line via oil lines. The return oil line is connected to the return oil pipe joint on the upper housing of the front-end loading oil distribution device. Each oil line of the hydraulic pump unit is connected to a high-pressure filter, a pressure sensor, an accumulator, and a relief valve. The high-pressure filter is connected to the high-pressure oil pipe joint and the medium-pressure oil pipe joint on the upper housing of the front-end loading oil distribution device via oil pipes. The rear-end loading oil distribution device is equipped with a high-pressure oil pipe joint, a medium-pressure oil pipe joint, a low-pressure oil pipe joint, and a return oil pipe joint.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] The nested high-flow-rate multi-stage pressure oil circuit distribution device of the present invention provides the required multi-channel hydraulic power oil source with high flow rate and multi-stage pressure for the rotary electro-hydraulic servo loading test bench, so as to realize the electro-hydraulic servo dynamic loading test on the rotating mechanism.

[0014] This invention utilizes fluid transmission and hydraulic dynamic sealing principles, employing nested sealing and fluid transmission technology to transfer the power oil source of stationary equipment to rotating equipment, providing a multi-channel, high-flow-rate, and pressure-controlled power oil source for rotating electro-hydraulic servo loading systems. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the multi-stage pressure oil circuit distribution device system for the rotary test bench of the present invention;

[0016] Figure 2 This is a schematic diagram of the nested multi-stage pressure oil pipe of the present invention;

[0017] Figure 3 This is a schematic diagram of the working principle of the nested multi-stage pressure oil circuit distribution device of the present invention;

[0018] Figure 4 This is a schematic diagram of the external appearance of the multi-stage pressure oil circuit distribution device (excluding the oil supply system) of the present invention;

[0019] Figure 5 This is a schematic diagram of the front and rear oil circuit distribution device of the present invention;

[0020] Figure 6 This is a schematic diagram of the low-pressure sealing assembly and the nested sealing assembly of the present invention;

[0021] Figure 7 This is a schematic diagram of the oil circuit distribution structure within the rear section of the shaft according to the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 7 As shown, a nested loading oil circuit distribution device for providing a power oil source for a rotary loading test bench includes: a front oil circuit distribution device 503, a rear oil circuit distribution device 503, an internal nested pipe, and a multi-channel, multi-stage pressure oil supply system 600. The front oil circuit distribution device is located at the head of the front section of the oil circuit transmission outer bushing, and the rear oil circuit distribution device 503 is located at the tail of the rear section of the oil circuit transmission outer bushing. The front oil circuit distribution device and the rear oil circuit distribution device 503 are connected by an internal nested multi-channel pipe 504, and the multi-channel oil supply system 600 is connected to the front oil circuit distribution device through hydraulic pipelines.

[0024] The front section oil circuit distribution device is divided into: front section external shaft oil circuit distribution device 501 and front section internal shaft oil circuit distribution device 502; the front section external shaft oil circuit distribution device 501 also contains: low pressure sealing assembly and nested high pressure sealing assembly.

[0025] The front-end external oil circuit distribution device 501 includes: an upper housing 101, a lower housing 103, a front housing head end cover 3, a front housing tail end cover 24, a housing connecting bolt assembly 102, a positioning ring 5, a head support bearing 4, a tail support bearing 22, a bearing bushing 58, a felt seal ring 57, a head felt seal pressure cover 2, a tail felt seal pressure cover 25, a sealing bushing 56, a nested oil distribution sealing assembly 11, a low-pressure sealing assembly 16, a housing high-pressure oil pipe and connector 10, a housing medium-pressure oil pipe and connector 12, a housing low-pressure oil pipe and connector 17, a return oil pipe connector 20, a front-end support copper bushing 74, a front-end positioning pin assembly 59, a positioning ring positioning pin 75, a front-end bolt assembly 23, a shaft Y-type sealing ring assembly 78, an O-type sealing ring assembly 77, and an oil pipe shaft sealing head end cover 1, etc.

[0026] The low-pressure sealing assembly includes: a low-pressure sealing ring 87, a low-pressure sealing bearing alloy 88-1, an anti-rotation fixing pin 63, and a bolt group 23, etc.

[0027] The nested oil-sealing assembly includes: a high-pressure sealing ring 83, a medium-pressure sealing ring 82, a sealing spacer ring group 84, a pressure-bearing head end cap 80, a pressure-bearing tail end cap 86, a pressure-bearing housing 85, a cavity ring 81, an O-ring seal 90, a medium-pressure sealing bearing alloy 88-2, a high-pressure sealing bearing alloy 88-3, a bolt group 23, a medium-pressure cavity connecting hole 69, and a sealing assembly positioning pin 70, etc.

[0028] The front section of the shaft internal oil distribution device includes: front section support copper bushing 74, shaft Y-type seal ring assembly 78, O-type seal ring assembly 77, front section high pressure seal ring cover 76, front section medium pressure seal ring cover 68, front section low pressure seal ring cover 64, front section high pressure guide oil bushing 73, front section medium pressure guide oil bushing 67, positioning pin assembly 65, anti-rotation fixing pin 63, etc.

[0029] The rear oil distribution device 503 includes: a rear support copper bushing 50, a rear bolt assembly 41, a shaft tail sealing end cover 40, a shaft Y-type sealing ring assembly 78, an O-type sealing ring assembly 77, a rear high-pressure sealing ring cover 42, a rear medium-pressure sealing ring cover 46, a rear low-pressure sealing ring cover 49, a rear high-pressure oil guide bushing 44, a rear medium-pressure oil guide bushing 47, a rear A-type dustproof ring 43, a rear positioning pin assembly 45, a rear high-pressure oil pipe joint 36, a rear medium-pressure oil pipe joint 34, and a rear low-pressure oil pipe joint 30, etc.

[0030] The internal multi-channel pipelines include: high-pressure oil pipe 95, medium-pressure oil pipe 94, low-pressure oil pipe 93, and oil return pipeline, as well as the outer bushing 27 for oil transmission.

[0031] The multi-channel oil supply system 600 includes a stainless steel oil tank 200, a #1 suction filter 201, a #2 suction filter 202, a #3 suction filter 222, a #1 hydraulic pump 203, a #2 hydraulic pump 204, a #3 hydraulic pump 220, a #1 high-pressure hose 207, a #2 high-pressure hose 208, a #1 check valve 209, a #2 check valve 210, a #1 medium-pressure filter 211, a #2 high-pressure filter 212, a #1 accumulator 213, a #2 accumulator 214, a #1 relief valve 215, a #2 relief valve 216, and a #3 relief valve 219. Hydraulic pumps 203, 204, and 220 are all equipped with electric motors.

[0032] The multi-channel loading oil circuit distribution device of the rotary test bench is arranged on and inside the oil circuit transmission outer bushing 27. The rear oil circuit distribution device, the middle multi-channel pipeline inside the shaft, and the front oil circuit distribution device are arranged sequentially along the front direction of the oil circuit transmission outer bushing 27. The multi-channel oil supply system is arranged outside the rotary test bench and is connected to the multi-channel oil pipe joint of the front oil circuit distribution device through oil pipes.

[0033] The front section oil circuit distribution device is installed on the outside and inside of the front section of the oil circuit transmission outer bushing 27, including the front section external shaft oil circuit distribution device and the front section internal shaft oil circuit distribution device; the front section external shaft oil circuit distribution device also includes a low-pressure sealing assembly 16, a nested oil distribution sealing assembly 11, etc.

[0034] The front section external oil circuit distribution device is placed on the front section of the shaft of the oil circuit transmission outer shaft sleeve 27. Along the shaft head direction, the sealing shaft sleeve 56, bearing bushing 58, low-pressure sealing assembly 16, nested oil distribution sealing assembly 11, positioning ring 5, first support bearing 4, front section housing first end cover 3, and first felt seal cover 2 are sequentially arranged. The sealing shaft sleeve 56 is fitted onto the front section of the oil circuit transmission outer shaft sleeve 27, with its tail end close to the inner boss of the oil circuit transmission outer shaft sleeve 27, and is positioned and fixed on the oil circuit transmission outer shaft sleeve 27 by the sealing shaft sleeve positioning pin 59-1. The bearing bushing 58 is fitted onto the oil circuit transmission outer shaft sleeve 27, with its tail end face close to the head end face of the sealing shaft sleeve 56, and is positioned and fixed on the oil circuit transmission outer shaft sleeve 27 by the tail bearing positioning pin 59-2. The tail support bearing... 22 is installed on bearing bushing 58; positioning ring 5 is fitted on the front part of the first direction of the oil passage transmission outer bushing 27 and is fixed on the oil passage transmission outer bushing 27 by positioning ring positioning pin 75; first support bearing 4 is fitted on oil passage transmission outer bushing 27, its tail end face is close to the first direction end face of positioning ring 5, upper housing 101 and lower housing 103 are connected by housing connecting bolt group 102, and both ends are respectively clamped on first support bearing 4 and tail support bearing 22; housing tail end cover 24 is fitted on sealing bushing 56 and connected to the tail end of upper housing 101 and lower housing 103 by bolt group 23-1; tail felt sealing cover 25 is fitted on sealing bushing 56 and close to the tail end face of housing tail end cover 24, tail felt sealing cover 25 and housing tail end A tail felt sealing ring 57-1 is provided between the covers 24. The tail felt sealing cover 25 and the tail end cover 24 of the housing are connected by bolt group 23-2, and the tail felt sealing ring 57-1 is pressed and fixed. The head end cover 3 of the housing is fitted onto the oil passage transmission outer bushing 27 and is connected to the first-direction end faces of the upper housing 101 and the lower housing 103 by bolt group 23-3. The head felt sealing cover 2 is fitted onto the oil passage transmission outer bushing 27 and is close to the first-direction end face of the head end cover 3 of the housing. A head felt sealing ring 57-2 is provided between the head felt sealing cover 2 and the head end cover 3 of the housing. The head felt sealing cover 2 and the head end cover 3 of the housing are connected by bolt group 23-4, and the head felt sealing ring 57-2 is pressed and fixed. The low-pressure sealing assembly 16 is arranged inside the upper housing 101 and the lower housing 103 and is fitted onto the... The tail end of the front section of the oil transmission outer bushing 27 is connected to the low-pressure oil pipe and connector 17 of the housing installed on the upper housing 101; the nested oil distribution sealing assembly 11 is arranged inside the upper housing 101 and the lower housing 103, and is fitted into the head end of the front section of the oil transmission outer bushing 27. It is connected to the high-pressure oil pipe and connector 10 and the medium-pressure oil pipe and connector 12 of the housing installed on the upper housing 101, respectively. An anti-rotation fixing pin 63 is provided between the nested oil distribution sealing assembly 11 and the low-pressure sealing assembly 16, and is fixed by bolt group 23-5; at the upper tail end of the upper housing 101, an oil return pipe connector 20 is provided, which is connected to the cooling oil pipe 6 inside the housing; the oil return pipe connector 20 is arranged at the tail end of the lower housing 103 and is connected to the external oil return circuit;

[0035] In the low-pressure sealing assembly 16, the low-pressure sealing ring 87 is fitted onto the oil passage transmission outer bushing and is located at the tail end inside the upper housing 101 and the lower housing 103. A low-pressure sealing bearing alloy 88-1 is provided between the low-pressure sealing ring 87 and the oil passage transmission outer bushing 27. The low-pressure sealing ring 87 is provided with a front-end oil distribution low-pressure chamber 18, which is connected to the low-pressure oil pipe and connector 17 on the upper housing 101.

[0036] In the nested oil distribution sealing assembly 11, the pressure-bearing tail end cap 86 is fitted onto the oil passage transmission outer bushing 27 and placed at the head of the upper housing 101 and lower housing 103, and is connected to the anti-rotation fixing pin 63 of the low-pressure sealing assembly 11 by bolt group 23-5; the pressure-bearing housing 85 is fitted onto the oil passage transmission outer bushing 27 and placed inside the upper housing 101 and lower housing 103, and the tail end face of the pressure-bearing housing 85 is connected to the head outer ring end face of the pressure-bearing tail end cap 86 by bolt group 89-1 inside the nested oil distribution sealing assembly 11, forming the medium-pressure cavity 13-1 at the tail of the nested oil distribution sealing assembly 11, and is connected to the medium-pressure oil pipe and connector 12 on the upper housing 101, and the cavity ring The 81 ring is mounted on the outer sleeve 27 of the oil passage and is connected to the first end face of the pressure housing 85 and the tail end face of the pressure first end cover 80 by bolt group 89-2. The cavity ring 81 and the pressure housing 85 form a high-pressure chamber 9 of the nested oil distribution sealing assembly 11, which is connected to the high-pressure oil pipe and connector 10 of the housing. The cavity ring 81 and the pressure first end cover 80 form a medium-pressure chamber 13-2 at the head of the nested oil distribution sealing assembly 11. The pressure housing 85 and the cavity ring 81 are provided with a communicating cavity 69 to form medium-pressure chambers 13-1 and 13-2 surrounding the high-pressure chamber 9. That is, the high-pressure chamber 9 of the nested oil distribution sealing assembly 11 is nested in the medium-pressure chamber 13. The medium-pressure sealing ring group 72 There are three, all fitted onto the front section of the oil transmission outer bushing 27. Two are located in the intermediate pressure chamber 13-1 at the tail of the nested oil distribution sealing assembly 11, and one is located in the intermediate pressure chamber 13-2 at the head of the nested oil distribution sealing assembly 11. Two intermediate pressure sealing rings 72-1 and 72-2 are installed in the intermediate pressure chamber 13-1 at the tail of the nested oil distribution sealing assembly 11. Intermediate pressure sealing ring 72-1 is connected to the head end face of the pressure-bearing tail end cover 86, and the head end face of intermediate pressure sealing ring 72-2 is close to the central boss of the pressure-bearing housing 85. A sealing spacer group 84-1 is fitted onto the front section of the oil transmission outer bushing 27 and is positioned between the intermediate pressure sealing rings 72-1 and 72-2. Bearing alloys 88-2 and 88-3 are provided between ring 72-1 and medium-pressure sealing ring 72-2 and oil circuit transmission outer bushing 27; a medium-pressure sealing ring 72-3 is provided in the first medium-pressure cavity 13-2 of the nested oil distribution sealing assembly 11, the first end face of sealing ring 72-3 is close to the tail end face of pressure bearing first end cover 80, sealing spacer 84-3 is fitted in the front section of oil circuit transmission outer bushing 27, and is provided in the first medium-pressure cavity 13-2 of the nested oil distribution sealing assembly 11, its first end face is close to the tail end face of sealing ring 72-3, and its tail end face is close to the first end face of the inner ring of the partition ring 81; bearing alloy 88-5 is provided between sealing ring 72-3 and oil circuit transmission outer bushing 27;The sealing spacer 84-2 and the high-pressure sealing ring 83 are fitted onto the oil transmission outer bushing 27 and placed in the high-pressure chamber 9 in the middle of the nested oil distribution sealing assembly 11. The first end face of the high-pressure sealing ring 83 is close to the tail end face of the inner ring of the partition ring 81. The first end face of the sealing spacer 84-2 is close to the tail end face of the high-pressure sealing ring 83, and its tail end face is close to the boss in the middle of the pressure-bearing housing 85. A bearing alloy 88-4 is provided between the high-pressure sealing ring 83 and the oil transmission outer bushing 27. The intermediate-pressure sealing ring 72, the high-pressure sealing ring 83, the sealing spacer group 84, the pressure-bearing housing 85, the partition ring 81, and the pressure-bearing tail end cap 86 in the nested oil distribution sealing assembly 11 are positioned by the sealing assembly positioning pin 70.

[0037] The front-end support copper bushing 74 of the front-end shaft oil distribution device is embedded in the front end of the oil transmission outer bushing 27 at the boss. The tail of the front-end support copper bushing 74 is fitted onto the front end of the low-pressure oil pipe 93 of the multi-channel pipeline in the middle of the shaft. A front-end shaft low-pressure oil chamber 62 is provided between the tail of the front-end support copper bushing 74 and the low-pressure oil pipe 93. The front-end shaft low-pressure oil chamber 62 is connected to the oil distribution low-pressure chamber 18 through the through hole 19. The front-end shaft low-pressure oil chamber 62 is connected to the low-pressure oil pipe cavity 53 through the connecting hole 61 of the front end of the low-pressure oil pipe 93. The tail of the front-end support copper bushing 74 and the front end of the low-pressure oil pipe 93 are provided with a shaft Y-type sealing ring group 78-1 and an O-type sealing ring group 77-1 to seal the front-end shaft low-pressure oil chamber 62. The boss of the sealing ring cover 64 is embedded in the front section of the low-pressure oil pipe 93 and the medium-pressure oil pipe 94 in the middle of the shaft. The outer ring end face of the sealing ring cover 64 is close to the first end face of the low-pressure oil pipe 93, and the inner ring end face of the sealing ring cover 64 is close to the first end face of the medium-pressure oil pipe 94. A shaft Y-type seal ring 78 and an O-type seal ring 77 are provided between the sealing ring cover 64 and the low-pressure oil pipe 93 and the medium-pressure oil pipe 94 to form a seal at the first end of the low-pressure oil pipe cavity 53 of the low-pressure transmission channel. The front section medium-pressure oil guide bushing 67 is nested in the middle of the front section support copper bushing 74. The tail end face of the front section medium-pressure oil guide bushing 67 is connected to the first end face of the front section low-pressure sealing ring cover 64 through the shaft positioning pin group 65-1. The middle part of the front section support copper bushing 74 is connected to the low-pressure oil pipe cavity 53. A front-section shaft-internal intermediate-pressure oil chamber 15 is formed between the oil pipe 93, the front-section low-pressure sealing sleeve ring cover 64, and the front-section intermediate-pressure oil guide bushing 67. A shaft-use Y-type seal ring 78 and an O-type seal ring 77 are provided to seal the front-section shaft-internal intermediate-pressure chamber 15. The front-section shaft-internal intermediate-pressure oil chamber 15 communicates with the front-section oil distribution intermediate-pressure chamber 13 through a through hole 14 in the middle of the front-section support copper bushing 74. A through hole 66 is provided on the front-section intermediate-pressure oil guide bushing 67 to connect the front-section shaft-internal intermediate-pressure oil chamber 15 and the intermediate-pressure oil pipe cavity 54. The boss of the front-section intermediate-pressure sealing sleeve ring cover 68 is embedded in the front section of the high-pressure oil pipe 95 within the oil passage transmission outer bushing 27 and the front-section intermediate-pressure oil guide bushing 67. A shaft-use Y-type seal ring 78 and an O-type seal ring 77 are provided between the high-pressure oil pipe 95 and the intermediate-pressure oil guide bushing 67. A Y-type sealing ring 77 forms a seal at the beginning of the medium-pressure oil pipe cavity 54; a front high-pressure oil guide bushing 73 is fitted onto the drive shaft 79 and nested in the beginning of the front support copper bushing 74; the end of the front high-pressure oil guide bushing 73 is connected to the beginning of the front medium-pressure sealing sleeve ring 64 and the front medium-pressure oil guide bushing 67 via an internal locating pin group 65-2; a front shaft internal high-pressure oil cavity 7 is formed between the beginning of the front support copper bushing 74 and the front high-pressure oil guide bushing 73, the front medium-pressure sealing sleeve ring 68, and the front medium-pressure oil guide bushing 67, which is equipped with a shaft Y-type sealing ring 78 and an O-type sealing ring 77 to seal the front high-pressure cavity 7; the front shaft internal high-pressure oil cavity 7 communicates with the front oil distribution high-pressure cavity 9 through the through hole 8 at the beginning of the front support copper bushing 74;A through hole 71 is provided on the front high-pressure oil guide bushing 73 to connect the high-pressure oil chamber 7 inside the front shaft and the high-pressure oil pipe chamber 55; the front high-pressure sealing sleeve ring cover 76 is fitted onto the drive shaft 79 inside the oil passage transmission outer bushing 27, and its boss is embedded in the front high-pressure oil guide bushing 73. A shaft Y-type sealing ring 78 and an O-type sealing ring 77 are provided between the drive shaft 79 and the front high-pressure oil guide bushing 73 to form a seal at the beginning of the high-pressure oil pipe chamber 55 of the high-pressure transmission channel; in the high The tail end face of the pressure sealing sleeve ring cover 76 and the head end face of the high pressure oil guide sleeve 73 are connected and positioned by the front section shaft locating pin 65-3; the oil pipe shaft seal head end cover 1 is fitted on the drive shaft 79 and connected to the head end face of the oil circuit transmission outer shaft sleeve 27 by the front section screw 23; a shaft Y-type seal ring and an O-type seal ring are provided between the oil pipe shaft seal head end cover 1, the drive shaft 79 and the oil circuit transmission outer shaft sleeve 27 to form the head end seal of the oil circuit transmission outer shaft sleeve 27 inner oil return cavity 26.

[0038] The rear support copper bushing 50 of the rear section of the internal oil distribution device is embedded in the shaft interior of the rear section of the oil transmission outer bushing 27 and is close to the inner boss of the oil transmission outer bushing 27. The head of the rear support copper bushing 50 is fitted onto the rear section of the low-pressure oil pipe 93 of the multi-channel pipeline in the middle of the shaft. A rear low-pressure oil chamber 29 is provided between the head of the rear support copper bushing 50 and the low-pressure oil pipe 93. The rear low-pressure oil chamber 29 is connected to the rear low-pressure oil pipe joint 30 through a through hole 31. A through hole 28 is provided on the rear section of the low-pressure oil pipe 93 to connect the rear low-pressure oil chamber 29 and the low-pressure oil pipe cavity 53. The tail of the rear support copper bushing 50 and the rear section of the low-pressure oil pipe 93 are provided with a shaft Y-type sealing ring group 78-1 and an O-type sealing ring group 77-1 to form a seal for the rear low-pressure oil chamber 29. The boss of the sealing ring cover 49 is embedded in the rear section of the low-pressure oil pipe 93 and the medium-pressure oil pipe 94 in the middle of the shaft. The outer ring end face of the sealing ring cover 49 is close to the first end face of the low-pressure oil pipe 93, and the inner ring end face of the sealing ring cover 49 is close to the first end face of the medium-pressure oil pipe 94. A shaft Y-type seal ring 78 and an O-type seal ring 77 are provided between the sealing ring cover 49 and the low-pressure oil pipe 93 and the medium-pressure oil pipe 94 to form a low-pressure oil pipe cavity 53 tail end seal. The rear section medium-pressure oil guide bushing 47 is nested in the middle of the rear section support copper bushing 50. The first end face of the rear section medium-pressure oil guide bushing 47 is connected to the tail end face of the rear section low-pressure sealing ring cover 49 through the rear section shaft positioning pin group 45-1. The middle of the rear section support copper bushing 50 is connected to the low-pressure oil pipe 93. 3. A rear-section medium-pressure oil cavity 32 is formed between the rear-section low-pressure sealing sleeve cover 49 and the rear-section medium-pressure oil guide bushing 47, and is provided with a shaft Y-type seal ring 78 and an O-type seal ring 77 to seal the rear-section medium-pressure oil cavity 32; the rear-section medium-pressure oil cavity 32 is connected to the rear-section medium-pressure oil pipe joint 34 through the through hole 35 in the middle of the rear-section support copper bushing 50; a through hole 33 is provided on the rear-section medium-pressure oil guide bushing 47 to connect the rear-section medium-pressure oil cavity 32 and the medium-pressure oil pipe cavity 54; the boss of the rear-section medium-pressure sealing sleeve cover 46 is embedded in the rear section of the high-pressure oil pipe 95 in the oil passage transmission outer bushing 27 and the rear-section medium-pressure oil guide bushing 47, and a shaft Y-type seal ring 78 and an O-type seal ring 77 are provided between the high-pressure oil pipe 95 and the rear-section medium-pressure oil guide bushing 47 to form the medium-pressure oil pipe cavity. 54. Tail end seal; The rear high-pressure oil guide bushing 44 is fitted onto the drive shaft 79 and nested in the tail of the rear support copper bushing 50. The head end of the rear high-pressure oil guide bushing 44 is connected to the tail end of the rear medium-pressure sealing sleeve ring cover 46 and the rear medium-pressure oil guide bushing 47 through the shaft positioning pin group 45-2. The tail of the rear support copper bushing 50 forms a rear high-pressure oil chamber 38 between the rear high-pressure oil guide bushing 44, the rear medium-pressure sealing sleeve ring cover 46, and the rear medium-pressure oil guide bushing 47. The chamber is equipped with a rear A-type dustproof ring 43, a shaft Y-type sealing ring 78, and an O-type sealing ring 77 to seal the rear high-pressure chamber 38. The rear high-pressure oil chamber 38 is connected to the rear high-pressure oil pipe joint 36 through the through hole 37 on the oil passage transmission outer bushing at the tail of the rear support copper bushing 50.A through hole 39 is provided on the rear high-pressure oil guide sleeve 44 to connect the rear high-pressure oil chamber 38 and the high-pressure oil pipe chamber 55; the rear high-pressure sealing sleeve ring cover 42 is fitted onto the drive shaft 79 inside the oil transmission outer sleeve 27, and its boss is embedded in the rear high-pressure oil guide sleeve 44. A shaft Y-type sealing ring 78 and an O-type sealing ring 77 are provided between the rear high-pressure oil guide sleeve 44 and the drive shaft 79 and the rear high-pressure oil guide sleeve 44 to form a seal at the beginning of the high-pressure oil pipe chamber 55; the first end face of the rear high-pressure sealing sleeve ring cover 42 and the rear high-pressure oil guide sleeve 55 are sealed. The tail end face of the pressure guide oil bushing 44 is connected and positioned by the locating pin 45-3 inside the rear shaft; the oil pipe shaft sealing end cap 40 is fitted on the drive shaft 79 and connected to the tail end face of the oil passage transmission outer bushing 27 by the rear screw group 41; a shaft Y-type seal and an O-type seal are provided between the oil pipe shaft sealing end cap 40, the drive shaft 79 and the oil passage transmission outer bushing 27 to form the tail end seal of the oil return chamber 26 inside the oil passage transmission outer bushing 27, and it is connected to the oil return connector 51 of the oil passage distribution device inside the rear shaft.

[0039] The low-pressure oil pipe 93 of the multi-channel pipeline inside the shaft is embedded at the tail of the front support copper bushing 74, with its initial end face abutting against the outer ring end face of the front low-pressure sealing sleeve cover 64. The rear section of the low-pressure oil pipe 93 is embedded at the head of the rear support copper bushing 50, with its tail end face abutting against the outer ring end face of the rear low-pressure sealing sleeve cover 49. The intermediate-pressure oil pipe 94 is embedded at the front low-pressure sealing sleeve cover 64, with its initial end face abutting against the inner ring end face of the front low-pressure sealing sleeve cover 64. The middle-pressure oil pipe 94 is embedded in the lower-pressure sealing ring cover 49, with the tail end face of the middle-pressure oil pipe 94 abutting against the outer ring end face of the lower-pressure sealing ring cover 49; the high-pressure oil pipe 95 is embedded in the middle-pressure sealing ring cover 68, with the head end face of the high-pressure oil pipe 95 abutting against the inner ring end face of the middle-pressure sealing ring cover 68; the high-pressure oil pipe 95 is embedded in the lower-pressure sealing ring cover 46, with the tail end face of the high-pressure oil pipe 95 abutting against the inner ring end face of the lower-pressure sealing ring cover 46.

[0040] The oil tank 200 of the multi-channel oil supply system is equipped with a No. 1 suction filter 201, a No. 2 suction filter 202, and a No. 3 suction filter 222; these are connected to the suction ports of hydraulic pumps 1#, 2#, 2#, and 3#, respectively. The outlet of hydraulic pump 1# 203 is connected to the inlet of check valve 1# 209 via high-pressure hose 207. The outlet of check valve 1# 209 is connected to the inlet of intermediate-pressure filter 211, accumulator 1# 213, and overflow valve 215. The outlet of intermediate-pressure filter 211 is connected to the intermediate-pressure oil pipe and connector 12 of the front-end oil distribution device. The outlet of hydraulic pump 2# 204 is connected to the inlet of check valve 2# 203 via high-pressure hose 205. The oil inlet of valve 210 is connected to the oil outlet of check valve 210, which is connected to the oil inlet of high pressure filter 212, accumulator 214, and overflow valve 216 respectively. The oil outlet of high pressure filter 212 is connected to the high pressure oil pipe and connector 10 of the front oil distribution device box. The return oil pipe connector 17 on the upper box 101 of the front oil distribution device is connected to the oil tank 200. The oil outlet of hydraulic pump 220 is connected to the low pressure connector 17 on the upper box 101 of the front oil distribution device and enters the upper and lower boxes. The return oil pipe connector 20 on the upper box 101 of the front oil distribution device is connected to the oil tank 200. The lower box 103 is equipped with an oil discharge connector 60, which is connected to the oil tank 200.

[0041] The high-pressure oil circuit channel of the multi-stage pressure oil circuit distribution device: Hydraulic oil enters the 2nd hydraulic pump 204 from the oil tank 200 through the 2nd suction filter 202. It becomes high-pressure oil from the outlet of the 2nd hydraulic pump 204. It is connected to the high-pressure oil pipe and connector 10 of the housing 101 of the front oil circuit distribution device through the 2nd high-pressure hose 208, the 2nd check valve 210, and the high-pressure filter 212. It enters the high-pressure chamber 9 of the nested high-pressure sealing assembly 11, enters the high-pressure oil chamber 7 inside the front shaft through the through hole 8, enters the high-pressure oil pipe chamber 55 of the high-pressure oil pipe 95 through the through hole 71, enters the through hole 39 of the rear oil circuit distribution device, flows into the rear high-pressure oil chamber 38, and enters the rear high-pressure oil pipe connector 36 through the through hole 37.

[0042] The medium-pressure oil passage of the multi-stage pressure oil distribution device: The oil enters the hydraulic pump 203 from the oil tank 200 through the No. 1 suction filter 201. The oil is converted to medium-pressure oil from the outlet of the No. 1 hydraulic pump 203. It is connected to the medium-pressure oil pipe and connector 12 of the housing 101 of the front oil distribution device through the No. 1 high-pressure hose 207, the No. 1 check valve 209, and the medium-pressure filter 211. It enters the medium-pressure oil chamber 13 of the nested high-pressure sealing assembly 11, enters the medium-pressure oil chamber 15 inside the front shaft through the through hole 14, enters the medium-pressure oil pipe chamber 54 of the medium-pressure oil pipe 94 through the through hole 66, enters the through hole 33 of the rear oil distribution device, flows into the rear medium-pressure oil chamber, and enters the rear medium-pressure oil pipe connector 34 through the through hole 35.

[0043] The low-pressure oil channel of the multi-channel loading oil distribution device: from the oil tank 200, it enters the hydraulic pump 220 through the 3# suction filter 222. The oil from the outlet of the hydraulic pump 220 becomes low-pressure oil, and is connected to the medium-pressure oil pipe and connector 12 of the housing 101 of the front section oil distribution device through the 3# hose 227, the 2# check valve 224, and the low-pressure filter 223. It enters the low-pressure chamber 18, passes through the through hole 19, enters the low-pressure oil chamber 62 inside the front section shaft, enters the low-pressure oil pipe chamber 52 of the low-pressure oil pipe 93 through the through hole 61, enters the through hole 28 of the rear section oil distribution device, flows into the rear section low-pressure oil chamber 29, and enters the rear section medium-pressure oil pipe connector 30 through the through hole 31.

[0044] The return oil port is connected to the rear return oil pipe joint 51 of the rear oil circuit distribution device. It is connected to the return oil cavity 26 between the outer shaft sleeve 27 and the low-pressure oil pipe 93 through the through hole 52. It enters the upper box 101 and lower box 102 of the front oil circuit distribution device through the through hole 21. Finally, it is connected to the oil tank 200 through the return oil joint 20 and return oil pipe on the upper box 101.

[0045] Finally, it should be noted that the above examples are merely a few specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench, characterized in that, include: The system comprises a front-end oil distribution device, a rear-end oil distribution device, an internally nested multi-way pipeline, and a multi-channel oil supply system. The front-end oil distribution device is located at the front end of the outer sleeve of the oil transmission system, and the rear-end oil distribution device is located at the rear end of the outer sleeve. The front-end and rear-end oil distribution devices are connected by an internally nested multi-way pipeline in the middle of the outer sleeve. The front-end oil distribution device includes an external oil distribution device and an internal oil distribution device, wherein the external oil distribution device further includes a low-pressure sealing assembly and a nested sealing assembly. The multi-channel oil supply system... The system is connected to the front-end oil distribution device via hydraulic pipelines; the multi-channel oil supply system includes a stainless steel oil tank, which is connected to a hydraulic pump group and a return oil line via oil lines; the return oil line is connected to the return oil pipe joint on the upper body of the front-end loading oil distribution device, and each oil line of the hydraulic pump group is connected to a high-pressure filter, a pressure sensor, an accumulator, and a relief valve; the high-pressure filter is connected to the high-pressure oil pipe joint and the medium-pressure oil pipe joint on the upper body of the front-end loading oil distribution device via oil pipes; the rear-end loading oil distribution device is equipped with a high-pressure oil pipe joint, a medium-pressure oil pipe joint, a low-pressure oil pipe joint, and a return oil pipe joint.

2. The nested high-flow-rate multi-stage pressure oil circuit distribution device for the rotary loading test bench according to claim 1, characterized in that: The front section external oil circuit distribution device is arranged at the front section of the oil circuit transmission outer bushing and is fitted onto the outside of the shaft; the front section internal oil circuit distribution device is arranged at the front section of the oil circuit transmission outer bushing and is nested inside the oil circuit transmission outer bushing; the front section external oil circuit distribution device, along the shaft head direction, sequentially installs a sealing bushing, a bearing bushing, a low-pressure sealing assembly, a nested oil distribution sealing assembly, a positioning ring, a first support bearing, a front section housing first end cover, and a first felt seal cover on the front section shaft of the oil circuit transmission outer bushing; the sealing bushing is fitted onto the rear boss position of the front section of the oil circuit transmission outer bushing and is secured by a sealing bushing positioning pin. The first bearing bushing is mounted side-by-side in the first direction and positioned by the tail bearing locating pin; the tail support bearing is mounted on the bearing bushing; the locating ring is mounted on the front section of the oil passage transmission outer bushing in the first direction and is fixed to the oil passage transmission outer bushing by the locating pin of the locating ring; the first support bearing is mounted on the oil passage transmission outer bushing, close to the locating ring in the first direction; the front and rear ends of the housing are clamped onto the first and tail support bearings; the tail end cover of the housing is mounted on the sealing bushing and connected to the tail ends of the upper and lower housings by bolts; the upper and lower housings are connected by housing bolt groups, and the tail felt sealing cover is mounted on... On the sealing bushing, a tail felt sealing ring is provided between the tail felt sealing cover and the tail end cover of the housing, close to the tail end cover of the housing. The tail felt sealing cover and the tail end cover of the housing are connected by bolts, and the tail felt sealing ring is pressed and fixed. The front end cover of the housing is fitted onto the shaft of the front section of the oil passage transmission outer bushing, and is connected to the front end of the upper housing and the lower housing by bolts. The front felt sealing cover is fitted onto the shaft of the front section of the oil passage transmission outer bushing, close to the front end of the front end cover of the housing. A front felt sealing ring is provided between the front felt sealing cover and the front end cover of the housing, and is connected by bolts, and the front felt sealing ring is pressed and fixed. The low-pressure sealing assembly is arranged inside the upper and lower housings, fitted onto the tail end of the front section of the oil passage transmission outer bushing, and connected to the low-pressure oil pipe and connector of the upper housing; the nested oil distribution sealing assembly is arranged inside the upper and lower housings, fitted onto the head end of the front section of the oil passage transmission outer bushing, and connected to the high-pressure oil pipe and connector of the upper housing and the medium-pressure oil pipe and connector of the housing, respectively. An anti-rotation fixing pin is provided between the nested oil distribution sealing assembly and the low-pressure sealing assembly; the return oil pipe connector is arranged in the upper part of the upper housing and connected to the cooling oil pipe inside the housing; the return oil pipe connector is arranged in the lower part of the lower housing and connected to the external return oil circuit.

3. The nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench according to claim 2, characterized in that: The low-pressure sealing ring of the low-pressure sealing assembly is fitted onto the front section of the oil passage transmission outer bushing and placed at the rear of the upper and lower housings. The low-pressure sealing ring has a front section oil distribution low-pressure chamber that is connected to the housing low-pressure oil pipe and connector on the upper housing. A low-pressure sealing bearing alloy is provided between the low-pressure sealing ring and the oil passage transmission outer bushing. An anti-rotation fixing pin is provided between the low-pressure sealing assembly and the high-pressure sealing assembly, and they are connected by bolts.

4. The nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench according to claim 2, characterized in that: The pressure-bearing tail end cap of the nested oil distribution sealing assembly is placed inside the upper and lower housings, fitted onto the front section of the oil passage transmission outer bushing, and connected to the first-direction anti-rotation fixing pin of the low-pressure sealing assembly; the pressure-bearing housing is inside the housing, fitted onto the front section of the oil passage transmission outer bushing, and its tail end face is connected to the first-direction pressure-bearing tail end cap by bolts, forming the tail-end medium-pressure chamber of the nested oil distribution sealing assembly, and connected to the medium-pressure oil pipe joint; the cavity diaphragm ring is fitted onto the oil passage transmission outer bushing, and is connected to the first-direction pressure-bearing housing. The end face and the tail end face of the pressure-bearing head cover are connected by bolts. The diaphragm ring and the pressure-bearing housing form a high-pressure chamber of the oil distribution sealing assembly. The high-pressure chamber is connected to the high-pressure oil pipe and joint of the housing. The diaphragm ring and the pressure-bearing head cover form the first intermediate-pressure chamber of the oil distribution sealing assembly. A connecting hole is provided between the pressure-bearing housing and the diaphragm ring to connect the first intermediate-pressure chamber and the tail intermediate-pressure chamber of the oil distribution sealing assembly, forming an intermediate-pressure chamber surrounding the high-pressure chamber. There are three intermediate-pressure sealing rings, which are fitted onto the front section of the oil passage transmission outer bushing. Two intermediate pressure sealing rings are located in the tail section of the oil distribution sealing assembly, and one is located in the head section of the oil distribution sealing assembly. The tail section of the oil distribution sealing assembly has two intermediate pressure sealing rings, one connected to the head end face of the pressure-bearing tail end cover and the other close to the central boss of the pressure-bearing housing. A sealing spacer is provided between the two intermediate pressure sealing rings, and a bearing alloy is provided between the two intermediate pressure sealing rings and the oil passage transmission outer bushing. The head section of the oil distribution sealing assembly has one intermediate pressure sealing ring, a sealing spacer is provided between the intermediate pressure sealing ring and the cavity ring, and a bearing alloy is provided between the intermediate pressure sealing ring and the oil passage transmission outer bushing. The high pressure sealing ring and the sealing spacer are fitted onto the front section of the oil passage transmission outer bushing and are located in the middle high pressure chamber of the oil distribution sealing assembly. A bearing alloy is provided between the high pressure sealing ring and the oil passage transmission outer bushing. The pressure-bearing head end cover, intermediate pressure sealing ring, high pressure sealing ring, sealing spacer, pressure-bearing housing, cavity ring, and pressure-bearing tail end cover of the nested oil distribution sealing assembly are positioned by a sealing assembly positioning pin.

5. The nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench according to claim 2, characterized in that: The front-end support copper bushing of the front-end shaft oil distribution device is embedded in the front section of the oil transmission outer bushing to the boss inside the shaft. The tail of the front-end support copper bushing is fitted onto the front section of the low-pressure oil pipe of the intermediate multi-way pipeline inside the shaft, and a Y-type seal and an O-type seal are provided between the bushing and the low-pressure oil pipe. The boss of the front-end low-pressure sealing sleeve ring is embedded in the front section of the low-pressure oil pipe and the medium-pressure oil pipe of the intermediate multi-way pipeline inside the shaft, and a Y-type seal and an O-type seal are provided between the bushing and the low-pressure oil pipe and the medium-pressure oil pipe. The front-end medium-pressure oil guide sleeve is nested in the middle of the front-end support copper bushing and is provided with a Y-type seal. The tail end face of the front-end medium-pressure oil guide sleeve is connected to the first end face of the front-end low-pressure sealing sleeve ring through a positioning pin. The boss of the front-end medium-pressure sealing sleeve ring is embedded in the high-pressure oil pipe of the intermediate multi-way pipeline inside the shaft and the front-end medium-pressure oil guide sleeve, and a shaft is provided between the boss and the high-pressure oil pipe and the medium-pressure oil guide sleeve. Y-rings and O-rings are used; the front high-pressure oil guide bushing is nested in the head of the front support copper bushing and is equipped with a shaft Y-ring. The tail end of the high-pressure oil guide bushing is connected to the head end face of the medium-pressure sealing sleeve ring cover, and the tail end face of the outer ring of the medium-pressure sealing sleeve ring cover is connected to the head end face of the medium-pressure oil guide bushing through a positioning pin; the front high-pressure sealing sleeve ring cover is fitted on the oil pipe, and its boss is embedded between the front high-pressure oil guide bushing and the oil pipe. A shaft Y-ring and O-ring are provided between the oil pipe and the high-pressure oil guide bushing. The tail end face of the high-pressure sealing sleeve ring cover and the head end face of the high-pressure oil guide bushing are connected and positioned by a positioning pin; the oil pipe shaft seal head end cover is fitted on the outer oil pipe and is connected to the head end of the oil passage transmission outer bushing by screws. A shaft Y-ring and O-ring are provided between the oil pipe shaft seal head end cover and the outer oil pipe, and an O-ring is provided between the oil passage transmission outer bushing and the oil pipe shaft seal head end cover.

6. The nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench according to claim 2, characterized in that: The rear support copper bushing of the rear oil circuit distribution device is embedded in the rear section of the oil circuit transmission outer bushing to the boss inside the shaft. The first part of the rear support copper bushing is fitted onto the rear section of the low-pressure oil pipe of the intermediate multi-channel pipeline inside the shaft, and a shaft Y-type seal and an O-type seal are provided between the bushing and the low-pressure oil pipe. The boss of the rear low-pressure sealing sleeve ring cover is embedded in the rear section of the low-pressure oil pipe and the medium-pressure oil pipe of the intermediate multi-channel pipeline inside the shaft, and a shaft Y-type seal and an O-type seal are provided between the bushing and the low-pressure oil pipe and the medium-pressure oil pipe. The rear medium-pressure oil guide sleeve is nested in the middle of the rear support copper bushing and is provided with a shaft Y-type seal. The first end face of the rear medium-pressure oil guide sleeve is connected to the tail end face of the rear low-pressure sealing sleeve ring cover through a positioning pin. The boss of the rear medium-pressure sealing sleeve ring cover is embedded in the rear high-pressure oil pipe and the rear medium-pressure oil guide sleeve, and a shaft Y-type seal is provided between the boss and the high-pressure oil pipe and the medium-pressure oil guide sleeve. The high-pressure oil guide sleeve is nested at the tail of the rear support copper bushing and is equipped with a shaft Y-type seal. The first end face of the high-pressure oil guide sleeve and the tail end face of the intermediate-pressure sealing sleeve ring cover, and the first end face of the outer ring of the intermediate-pressure sealing sleeve ring cover and the tail end face of the intermediate-pressure oil guide sleeve are connected by a positioning pin. The high-pressure sealing sleeve ring cover is fitted onto the oil pipe, and its boss is embedded between the high-pressure oil guide sleeve and the oil pipe. A shaft Y-type seal and an O-type seal are provided between the oil pipe and the high-pressure oil guide sleeve. The first end face of the high-pressure sealing sleeve ring cover and the tail end face of the high-pressure oil guide sleeve are connected and positioned by a positioning pin. The oil pipe shaft seal tail end cover is fitted onto the outer oil pipe and is connected to the tail end of the oil passage transmission outer sleeve by screws. A shaft Y-type seal and an O-type seal are provided between the oil pipe shaft seal tail end cover and the outer oil pipe, and an O-type seal is provided between the oil pipe shaft seal tail end cover and the oil passage transmission outer sleeve.

7. The nested high-flow-rate multi-stage pressure oil circuit distribution device for a rotary loading test bench according to claim 2, characterized in that: The low-pressure oil pipe of the multi-channel pipeline within the shaft has its front section embedded in the tail of the front support copper bushing, with the first end face of the low-pressure oil pipe abutting against the tail-facing end face of the outer ring of the front low-pressure sealing sleeve cover. The rear section of the low-pressure oil pipe is embedded in the head of the rear support copper bushing, with its tail end face abutting against the head-facing end face of the outer ring of the rear low-pressure sealing sleeve cover. Similarly, the middle-pressure oil pipe has its front section embedded in the boss of the front low-pressure sealing sleeve cover, with its first end face abutting against the tail-facing end face of the inner ring of the front low-pressure sealing sleeve cover. The rear section of the middle-pressure oil pipe is embedded... Inside the boss of the rear low-pressure sealing sleeve cover, the tail end face of the medium-pressure oil pipe abuts against the first end face of the inner ring of the rear low-pressure sealing sleeve cover; the front section of the high-pressure oil pipe is embedded inside the boss of the front medium-pressure sealing sleeve cover, and the first end face of the high-pressure oil pipe abuts against the tail end face of the inner ring of the front medium-pressure sealing sleeve cover; the rear section of the high-pressure oil pipe is embedded in the inner ring of the rear medium-pressure sealing sleeve cover, and the tail end face of the high-pressure oil pipe abuts against the first end face of the inner ring of the rear medium-pressure sealing sleeve cover; a return oil pipeline is formed between the low-pressure oil pipe and the oil circuit transmission outer bushing.

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