CN217560857U - Lubricating oil pressure detection equipment - Google Patents

Abstract

The utility model discloses a lubricating oil pressure detection device, which is characterized by comprising an outer shell, wherein an inflation quick connector and an air supply quick connector are arranged on the outer shell, and an inflation loop and a pressure reduction loop are communicated between the inflation quick connector and the air supply quick connector; the quick connector comprises an inflation pipeline (1) connected to the inner side of the inflation quick connector, wherein a one-way valve (2), a gas filter (3), a gas storage unit (4) and a first overflow valve (5) are sequentially connected to the inflation pipeline (1); the pressure reduction loop is divided into a proportional pressure reduction loop and a manual pressure reduction loop; and a first stop valve (6) and a first pressure sensor (7) are connected between the gas filter (3) and the gas storage unit (4). The utility model has the advantages of no pollution to the environment.

Description

Lubricating oil pressure detection equipment

Technical Field

The utility model relates to an engine inspection technical field especially relates to a lubricating oil pressure check out test set.

Background

At present, the lubricating oil pressure detector adopts oil with the same type as the tested lubricating oil as a pressure transmission medium, the oil leakage phenomenon of different degrees exists in the use of the device, and the device is frequently required to be subjected to fault removal, oil supplement and cleaning maintenance; the equipment with the oil medium needs to drain the oil completely before carrying and transporting, and the oil is refilled after the equipment arrives at a destination, so that the workload is increased; in a new flight training outline, the transition frequency and the training intensity are greatly improved, new requirements are provided for the construction of multi-model guarantee capability, the requirement of the generalization of the guarantee equipment is obviously increased, and the problem that the conventional lubricating oil pressure detection equipment cannot be universally used among models due to different lubricating oil marks exists.

In patent CN202020266604.1, a lubricating oil pressure tester is disclosed, including tester body and inspection probe, the lower fixed surface of tester body is connected with the backup pad, the lower surface edge of backup pad articulates there is the connecting block, the lower fixed surface of connecting block is connected with the arc, the last fixed surface of arc is connected with reset spring, reset spring's top and the lower fixed surface of backup pad are connected, the lower fixed surface of backup pad is connected with adjustment mechanism, the lower fixed surface of arc is connected with fixed establishment, the utility model discloses can effectively improve the convenience that lubricating oil pressure tester used, the work degree of difficulty and the intensity of labour of staff's aircraft engine lubricating oil pressure inspection have been reduced simultaneously, and then the work efficiency of aircraft engine lubricating oil pressure inspection has been improved, but this tester can not provide pressure for lubricating oil pressure sensor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provide a lubricating oil pressure check out test set, this equipment carries out pressure detection through adopting atmospheric pressure, gaseous media as pressure detection can not remain on being detected the device, more can not cause the pollution to being detected the device, this time design medium adopts the mist of clean air, nitrogen gas or clean air and nitrogen gas, wherein clean air, nitrogen gas all are inert gas, the release can not cause the pollution to the environment in the air.

The purpose of the utility model is realized through the following technical scheme:

an oil pressure detection apparatus comprising:

the quick air inflation connector and the quick air supply connector are communicated with each other through an air inflation loop and a pressure reduction loop; an inflation pipeline is further arranged on the inner side of the inflation quick connector, and a one-way valve, a gas filter, a gas storage unit and a first overflow valve are sequentially connected onto the inflation pipeline; the pressure reducing loop is divided into a proportional pressure reducing loop and a manual pressure reducing loop.

Further, a first stop valve and a first pressure sensor are connected between the gas filter and the gas storage unit.

Further, the gas storage unit is a gas storage tank, and the gas in the gas storage tank adopts clean air, nitrogen or mixed gas of clean air and nitrogen.

Furthermore, a second stop valve and a first-stage pressure reducing valve are connected between the gas filter and the gas storage unit, and the other end of the first-stage pressure reducing valve is communicated with the proportional pressure reducing circuit and the manual pressure reducing circuit.

Further, the proportion decompression circuit includes the first decompression pipeline that communicates with one-level relief valve, first decompression pipeline communicates in proper order has proportion relief valve and solenoid valve.

Furthermore, the manual pressure reducing circuit comprises a second pressure reducing pipeline communicated with the first-stage pressure reducing valve, and the second pressure reducing pipeline is sequentially communicated with a manual pressure reducing valve and a third stop valve.

Furthermore, a second overflow valve is arranged between the primary pressure reducing valve and the proportional pressure reducing valve as well as between the primary pressure reducing valve and the manual pressure reducing valve.

Furthermore, a second pressure sensor is arranged between the electromagnetic valve, the third stop valve and the air supply quick connector.

The utility model has the advantages that:

the utility model provides a pair of lubricating oil pressure check out test set adopts atmospheric pressure to carry out pressure measurement, and gaseous medium that detects as pressure can not remain on being detected the device, more can not cause the pollution to being detected the device, and this time design medium adopts the mist of clean air, nitrogen gas or clean air and nitrogen gas, and wherein clean air, nitrogen gas all are inert gas, and the release can not cause the pollution to the environment in the air.

Drawings

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a block diagram of a controller operation;

fig. 3 is a functional block diagram of a controller.

In the figure, 1-an inflation pipeline, 2-a one-way valve, 3-a gas filter, 4-a gas storage unit, 5-a first overflow valve, 6-a first stop valve, 7-a first pressure sensor, 8-a second stop valve, 9-a first-stage pressure reducing valve, 10-a first pressure reducing pipeline, 11-a proportional pressure reducing valve, 12-an electromagnetic valve, 13-a second pressure reducing pipeline, 14-a manual pressure reducing valve, 15-a third stop valve, 16-a second overflow valve and 17-a second pressure sensor.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

In this embodiment, as shown in fig. 1, the lubricating oil pressure detection device includes an outer shell, an inflation quick connector and an air supply quick connector are arranged on the outer shell, and an inflation loop and a pressure reduction loop are communicated between the inflation quick connector and the air supply quick connector; an inflation pipeline 1 is further arranged on the inner side of the inflation quick connector, and a one-way valve 2, a gas filter 3, a gas storage unit 4 and a first overflow valve 5 are sequentially connected to the inflation pipeline 1; the pressure reducing loop is divided into a proportional pressure reducing loop and a manual pressure reducing loop. The inflation circuit is used for inflating an external air source to the air storage unit through the related air pressure element, and the decompression circuit is mainly used for performing primary decompression and secondary decompression on high-pressure air in the energy storage unit.

In the embodiment, the outer shell is an aluminum alloy protection box, the aluminum alloy protection box is used for installing a control panel assembly, and the aluminum alloy protection box is formed by riveting aluminum alloy plates through stainless steel angle bars; the bottom of the box body is provided with two rubber wheels for equipment movement; the back of the box body is provided with a telescopic positioning pull rod; the back of the box body is provided with four rubber pads for flatly placing the whole equipment; an installation flange edge is arranged in the aluminum alloy protection box and used for installing a control panel; black pearl wool with the thickness of 3mm is arranged in the aluminum alloy protective box.

The inflation quick connector is a standard quick connector for gas, is externally connected with a screw thread M16 multiplied by 2 and is connected with the air pressure hose through the screw thread; the check valve 2 is a BC6 type pneumatic check valve with good valve technology, the check valve is provided with a double-clamp connector, the valve body is made of 316L stainless steel, the maximum working pressure is 35MPa, and the check valve is elastic in sealing material and free of noise; the gas filter 3 is an HP type 1/4' high-pressure gas filter, the shell of the filter is made of 316 stainless steel, the filtering precision is 5 mu m, and the working pressure can reach 35MPa; the gas storage unit 4 is also provided with a pressure transmitter, the pressure transmitter is used for monitoring the gas source pressure of the gas storage unit, the MPM489 type pressure transmitter of Mick company is selected, the transmitter body is made of stainless steel, the measurement range is 0-20MPa, the precision is +/-0.5 FS%, the output signal is 4-20mA, and an interface form of navigation mark M12 x 1 is adopted.

The embodiment is further configured as follows: a first stop valve 6 and a first pressure sensor 7 are also connected between the gas filter 3 and the gas storage unit 4.

In this embodiment, the first stop valve 6 is a 31ND type angle needle valve with a good valve technology, the inlet and outlet of the valve are 90 degrees, the valve is convenient for piping connection, the valve body is forged from 316 stainless steel, the working pressure is 5000psi, and the valve is opened and closed through the regulating wheel.

The embodiment is further configured as follows: the gas storage unit 4 is a gas storage tank, and the gas in the gas storage tank adopts clean air, nitrogen or mixed gas of clean air and nitrogen.

In the embodiment, the gas storage tank is used for storing a high-pressure gas source, the gas storage capacity is 1L, the gas storage tank is a high-pressure aluminum alloy gas cylinder and is made of 6061, the nominal working pressure is 15MPa, the hydrostatic test pressure is 22.5MPa, and the aluminum alloy gas cylinder meets the requirements of GB/T11640 aluminum alloy seamless gas cylinder.

The embodiment is further configured as follows: and a second stop valve 8 and a first-stage pressure reducing valve 9 are further connected between the gas filter 3 and the gas storage unit 4, and the other end of the first-stage pressure reducing valve 9 is communicated with a proportional pressure reducing circuit and a manual pressure reducing circuit.

The embodiment is further configured as follows: the proportional pressure reducing circuit comprises a first pressure reducing pipeline 10 communicated with the primary pressure reducing valve 9, and the first pressure reducing pipeline 10 is sequentially communicated with a proportional pressure reducing valve 11 and an electromagnetic valve 12.

In the embodiment, the proportional pressure reducing valve 11 is an LVP50 type low-temperature proportional pressure reducing valve, the inlet pressure of the proportional pressure reducing valve is less than or equal to 1.5MPa, the outlet pressure of the proportional pressure reducing valve can be continuously adjusted between (0 to 0.6) MPa, and a control signal is input through a display screen, wherein the control signal is 4 to 20ma.

The embodiment is further configured as follows: the manual pressure reducing circuit comprises a second pressure reducing pipeline 13 communicated with the primary pressure reducing valve 9, and the second pressure reducing pipeline 13 is sequentially communicated with a manual pressure reducing valve 14 and a third stop valve 15.

In the embodiment, the manual pressure reducing valve 14 adopts a BR1 series manual precision pressure reducing valve, the inlet pressure of the valve can reach 42MPa, the outlet pressure of the valve can be adjusted within the range of 0.01 to 0.68MPa, and the adjusting precision is +/-0.5%; the first stop valve 6, the second stop valve 8 and the third stop valve 15 adopt QF-2 standard brass stop valves, and a valve body is provided with a rupture disk for ensuring that the pressure of a stored air source in the aluminum alloy gas cylinder is under a safe pressure value.

The embodiment is further configured as follows: and a second overflow valve 16 is arranged between the primary reducing valve 9 and the proportional reducing valve 11 and between the primary reducing valve and the manual reducing valve 14.

In this embodiment, the first overflow valve 5 and the second overflow valve 16 are RV600 types of the best valve technology, the factory-set pressure value is 6.5bar, and when the pressure value at the outlet of the primary pressure reducing valve exceeds 6.5bar, the overflow valves release pressure.

The embodiment is further configured as follows: and a second pressure sensor 17 is arranged between the electromagnetic valve 12, the third stop valve 15 and the air supply quick joint.

The electromagnetic valve 12 is a ZC01 type normally closed low-temperature electromagnetic valve, and the use pressure of the electromagnetic valve is 10bar. Coil voltage DC24V, coil protection grade IP65, coil power consumption 9W, inlet and outlet threads G1/4 internal threads and valve body material stainless steel.

In a second embodiment, the present embodiment is based on the first embodiment:

an electricity storage unit, an electrical control system and a control panel are also arranged in the shell; the electricity storage unit mainly comprises a battery pack, a charging interface, a power switch, a charger and other components; the battery pack selects a low-temperature 18650 electric core, the nominal voltage is 25.9V, the nominal capacity is 7800mAh, and the power supply can be normally used for 6 hours; the battery is communicated with the electric control system in real time, the electric quantity of the battery can be displayed on a display screen in real time, and when the electric quantity is low, the equipment gives a low-electric-quantity prompt and can charge the battery; the equipment can also be directly connected with an AC220V 50Hz commercial power by a power line to supply power to the equipment, and the equipment can be normally used.

The battery has the characteristics that: current: 2A discharge can be sustained, and large current (7A) discharge in short time can be realized; the battery cell characteristics are as follows: adopting an electric core capable of discharging at an ultralow temperature of-48 ℃; the battery pack has long cycle life and conforms to the concepts of low carbon, energy conservation and environmental protection value; the charging interface is arranged on the front surface of the control panel, the charging interface adopts a Weipu two-pin aviation plug, a plug seat is provided with a threaded dustproof cap, the plug body is made of aluminum alloy, the surface degree of the plug body is chromium, the rated current is 10A, the working voltage is 500V, and the insulation resistance is 2000 megaohms; the charging interface is connected with the battery pack through a DC type plug; the button switch is a high-current type switch, is of a self-reset type, and is made of stainless steel; the contact working current is 7A, and the voltage is 220V; the output current 2A, the output voltage 29.4V and the input voltage 220V of the charger. And cables at two ends of the charger are arranged in a magic tape and then stored in the storage box on the right side of the value control panel.

The electric control system mainly comprises a low-temperature display screen, a controller, a pressure acquisition device and the like.

The electrical system functions as follows:

a) Low-temperature display screen

The low-temperature display adopts a step CZ-6 type low-temperature resistant display screen, the storage temperature of the display screen can not be damaged within the range of minus 59-70 ℃, and the display screen can be normally used in the environment with the working temperature of minus 48-60 ℃; the pressure of each monitoring point and the opening and closing states of the electric valve are displayed on the screen in a centralized mode, the size of the screen is 5.7 inches, the protection level of the whole machine reaches IP67, and the on-off state of the low-temperature electromagnetic valve and the air supply pressure can be adjusted through the low-temperature screen with a button switch;

b) Controller

The controller adopts an embedded microcontroller as a control core, can send a control instruction to the controller through the RS-232 and RS-485 interfaces of the computer, can complete 3-channel discrete quantity output, 2-channel discrete quantity acquisition, 1-channel 4-20 mA analog quantity output and 2-channel 4-20 mA analog quantity acquisition according to the computer instruction or specified discrete quantity input, and adopts high-reliability design for a circuit and software of the controller, and can work in low-temperature and severe electromagnetic environments.

c) Pressure acquisition

The pressure acquisition system processes the signal of the pressure transmitter into a signal which can be identified by the controller, and the controller obtains the signal to perform software analysis and finally displays the signal on the display system for the user to refer to; because the pressure range required by each pressure end is different, the pressure transmitter used by the equipment is different. At the inlet high-pressure end, the range of a pressure transmitter equipped at the pressure monitoring end of the gas storage tank is (0 to 20) MPa, and the precision is 0.5 grade; at the air outlet of the equipment, the range of the equipped pressure transmitter is (0~1) MPa, and the precision is 0.5 grade. The pressure transmitter is an MPM489 high-performance stainless steel pressure transmitter of Mike company, and the product can be normally used in the environment of-48-125 ℃.

The equipment is also provided with a certain jumper device and a pressure sensor metering input interface, and the online metering work of the pressure sensor can be completed through the device, so that the repeated disassembly of the sensor is avoided, and the labor intensity is greatly reduced. The electric signal of the sensor can be led out from the inside of the case through the jumper device and is in butt joint with external standard metering equipment, and the online metering work of the sensor is completed.

The controller is connected with an electromagnetic valve switch of the equipment and an air pressure rise and drop instruction switching value input signal through a DI interface, and is connected with an electromagnetic valve power supply coil switching value output signal of the equipment through a DO, the controller is connected with the air storage tank pressure sensor and the equipment air supply pressure sensor through 2 paths of 4-20 mA analog quantity input signals, the controller controls the low-temperature type proportional pressure reducing valve through 1 path of 4-20 mA analog output signal, and is connected with a touch screen of the system through an RS-232 interface and is connected with the low-temperature lithium battery through an RS-485 interface. The whole system realizes the functions of automatic adjustment, fault monitoring and fault alarm under the logical operation of the controller.

The working principle of the controller is as follows:

the communication and discrete quantity input/output of the controller greatly reduce the influence of a ground loop on a circuit; the control panel adopts dominant frequency 72 output, analog quantity input/output, timing etc. functions to be accomplished by the control panel, and the control panel adopts 24VDC as power supply, and 24VDC passes through protection circuit at first after getting into the control panel, guarantees that the control panel can normally work under the condition that power supply has surge and pulse group, then filters power frequency and common mode interference through filter circuit, and the power after the filtration enters into isolation DC/DC and provides working power supply for microcontroller and functional circuit. The isolation power supply adopts a 32-bit RISC microcontroller which not only ensures the safety MHz of the circuit board as a control core, the microcontroller core adopts a Cortex-M3 inner core and comprises abundant peripheral equipment, and the discrete quantity input/output is finished by an I/O control light partition (protection cpu) of the microcontroller; the analog quantity input/output is completed by controlling A/D, D/A by an SPI interface of the microcontroller; the RS-232/RS-485 interface is completed through 3 UART interfaces and an interface conversion chip of the microcontroller; the timing function is accomplished by an internal 32-bit timer. All functional circuits are electrically isolated from the microcontroller, so that the safety of the control panel is greatly guaranteed, and TVSs and protection diodes are mounted on all lines connected with external interfaces to guarantee the safety of input and output interfaces.

In the design of the whole circuit board, besides a large number of hardware circuits for ensuring the reliability, a large number of reliability designs are also made in software, and the reliability of the whole equipment is ensured by adopting the modes of instruction redundancy, error interception, watchdog and the like.

The control panel is used for installing components such as a pressure reducing valve, a stop valve, a quick connector, a pressure gauge, a handle rod and the like. The control panel thickness is 4mm, wholly adopts aluminium alloy material to make. The periphery of the control panel is provided with mounting holes which are matched with the aluminum alloy protective box for mounting. In order to enhance the overall rigidity of the control panel, the control panel adopts a frame type structure for welding, the control panel is integrally subjected to surface paint spraying treatment, and an operation nameplate, a black font and a warning position are engraved on the relevant valve accessories of the control panel. The adjusting component of the common operating element is arranged on the front surface of the control panel, and other components are arranged in the control panel.

The embodiment is further configured as follows: the equipment is also provided with two low-temperature resistant rubber hoses, the storage temperature is within the range of minus 59 ℃ to 70 ℃, the rubber hoses cannot be damaged, and the rubber hoses can be normally used in an environment with the working temperature of minus 48 ℃ to 60 ℃; a rubber hose (DN 3, L4m, PN50 MPa) with the drift diameter of 3mm is used for inflating an air storage tank in the equipment, a connector at one end of the inflating hose can be butted with a self-sealing connector of an inflating port of the equipment, and the other end of the hose can be butted with a nitrogen bottle or a nitrogen charging vehicle through a switching connector; the rubber hose (DN 3, L3M, PN1.6 MPa) with the drift diameter of 3mm is used for connecting the air supply port of the equipment with the onboard interface, one end of the hose can be butted with the self-sealing joint of the air supply port of the equipment, the other end of the hose is matched with the onboard interface in a connecting mode, the nut thread is M12 multiplied by 1, the butt joint of the equipment and the airplane can be realized, and the rubber hose with the drift diameter of 3mm can also be used for the online detection of the sensor; the two hoses are arranged by the magic tape and then stored in the storage box on the right side of the control panel.

The utility model discloses the principle:

the equipment adopts a built-in gas storage tank, and high-pressure gas in the gas cylinder is reduced to a gas pressure value required by instrument calibration through a primary pressure reducing device after being filtered by a high-pressure filter; the whole set of equipment can automatically adjust the secondary pressure by using an electric control proportional pressure reducing valve, can also manually adjust the secondary pressure of an air source by using a purely manual precision pressure reducing valve, and is provided with a low-temperature rechargeable lithium battery for supplying power to the equipment in order to ensure the normal work of electric elements such as an electric valve, an electric control proportional valve, a pressure sensor, a low-temperature display screen and the like; the equipment is provided with a quick connector and an electrical switching interface which are used for pressure sensing online measurement, all sensors can perform online measurement in situ, and the sensors do not need to be detached independently; when an external air source is used for inflating the lubricating oil pressure tester, the pressure of the external air source needs to be confirmed, and when the pressure of the air source is higher than 15MPa, a pressure reducing valve needs to be configured to reduce the pressure of the external air source to a pressure value below 15 MPa; inflation mode 1: one end of an inflating hose is connected with an air source, a quick connector at the other end of the inflating hose is connected with equipment, a stop valve 2 is closed, a stop valve 1 on a pressure sensor pipeline is opened (except for on-line metering closing), and the inflating is stopped when the display value of a pressure sensor P1 is close to 15 MPa. After the inflation is finished, the air source is closed, and then the quick connector connected with the inflation inlet of the equipment is disassembled.

A gas supply stage: manual air supply: connecting the air supply hose to an air supply port of an engine and equipment, opening a second stop valve 8 and a third stop valve 15, adjusting a manual pressure reducing valve 14 on an operation panel (the pressure can be increased and decreased by adjusting a regulating handle of the pressure reducing valve in the positive and negative directions, and the pressure can be increased and decreased step by step in (0-0.6) MPa), and checking the system until the value displayed by the second pressure sensor is the required value;

electric air supply: the pressure regulating range of a first-stage manual pressure reducing valve 9 on the electric air supply pipeline is (0.04 to 1.7) MPa, the valve is regulated when equipment leaves a factory (the valve is not regulated during subsequent use), the pressure of an outlet of the valve is regulated to 0.6MPa, a regulating handle is locked after regulation is completed, misoperation is prevented, a nameplate is hung on the manual pressure reducing valve 14, the manual pressure reducing valve 14 is placed in a box body, and the manual pressure reducing valve 14 can be regulated only by disassembling an integrated mounting frame; the air supply hose is connected to an air supply port of an engine and equipment, an electromagnetic valve 12 arranged on a key of a low-temperature display screen is used for opening and closing the key, a boosting key, a pressure reduction key and an emergency stop key, the electromagnetic valve 12 is opened, the boosting or pressure reduction key is clicked on the display screen, the output pressure of the equipment is increased or reduced by 0.005MPa (the stepping value can be adjusted in the later period) every time the boosting or pressure reduction key is clicked, the output pressure of the equipment is stepped up and reduced in (0-0.6) MPa through a proportional pressure reducing valve 11 for adjustment, and the system is verified after adjustment is completed; when an emergency occurs, the emergency stop button can be clicked, the system is unloaded immediately, and the use safety of the equipment is ensured.

The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A lubricant pressure detecting apparatus, characterized by comprising:

the quick air inflation connector and the quick air supply connector are communicated with each other through an air inflation loop and a pressure reduction loop; an inflation pipeline (1) is further arranged on the inner side of the inflation quick connector, and a one-way valve (2), a gas filter (3), a gas storage unit (4) and a first overflow valve (5) are sequentially connected onto the inflation pipeline (1); the pressure reducing loop is divided into a proportional pressure reducing loop and a manual pressure reducing loop.

2. The lubricating oil pressure detecting apparatus according to claim 1, characterized in that: and a first stop valve (6) and a first pressure sensor (7) are connected between the gas filter (3) and the gas storage unit (4).

3. The lubricating oil pressure detecting apparatus according to claim 1, characterized in that: the gas storage unit (4) is a gas storage tank, and the gas in the gas storage tank adopts clean air, nitrogen or mixed gas of clean air and nitrogen.

4. The oil pressure detection apparatus according to claim 1, characterized in that: and a second stop valve (8) and a first-stage pressure reducing valve (9) are further connected between the gas filter (3) and the gas storage unit (4), and the other end of the first-stage pressure reducing valve (9) is communicated with the proportional pressure reducing loop and the manual pressure reducing loop.

5. The oil pressure detection apparatus according to claim 4, characterized in that: the proportional pressure reducing loop comprises a first pressure reducing pipeline (10) communicated with the primary pressure reducing valve (9), and the first pressure reducing pipeline (10) is sequentially communicated with a proportional pressure reducing valve (11) and an electromagnetic valve (12).

6. The oil pressure detection apparatus according to claim 5, characterized in that: the manual pressure reducing circuit comprises a second pressure reducing pipeline (13) communicated with the primary pressure reducing valve (9), and the second pressure reducing pipeline (13) is sequentially communicated with a manual pressure reducing valve (14) and a third stop valve (15).

7. The oil pressure detection apparatus according to claim 6, characterized in that: and a second overflow valve (16) is arranged between the primary pressure reducing valve (9) and the proportional pressure reducing valve (11) as well as between the primary pressure reducing valve and the manual pressure reducing valve (14).

8. The oil pressure detection apparatus according to claim 6, characterized in that: and a second pressure sensor (17) is arranged between the electromagnetic valve (12), the third stop valve (15) and the air supply quick joint.

Images