A portable diesel engine proportional valve internal leakage detection system and method

Abstract

This invention relates to a portable diesel engine proportional valve internal leakage detection system and method, comprising: a pilot valve test plate with a first hole, a second hole, a third hole, and a first fixing hole, wherein the first fixing hole matches the fixing hole of the pilot valve; a main valve test plate with a fourth hole, multiple fifth holes, and a second fixing hole, wherein the second fixing hole matches the fixing hole of the main valve; and a distribution block with a main flow channel inside, an outlet pipe at the outlet end of the main flow channel, a flow detection element at the outlet pipe, and the main flow channel also connecting to a first branch flow channel and a second branch flow channel. Both the inlet ends of the first and second branch flow channels are equipped with switching valves. The switching valve of the first branch flow channel can be connected to the first hole through a pipe, and the switching valve of the second branch flow channel can be connected to the fourth hole through a pipe. The system of this invention reduces detection costs.

Description

Technical Field

[0001] This invention relates to the field of diesel engine testing equipment technology, specifically to a portable diesel engine proportional valve internal leakage detection system and method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The ELFI or FIVA (Electronic Fuel Injection & Fuel Injection Valve Actuation) proportional valve, a key component of the electronic fuel injection unit in the MAN B&W ME series electronic fuel injection diesel engine, plays a crucial role in precisely driving the opening and closing of fuel injection and exhaust valves during daily operation. However, the precise operation of the ELFI or FIVA proportional valve depends not only on the control commands from the ECS control system but also on the leakage of the hydraulic oil driving the valve within the ELFI or FIVA valve.

[0004] Currently, the maintenance solution for ELFI or FIVA proportional valves on the market involves sending them to a specialized onshore testing facility for inspection before finally sending them to the ship for installation. This solution involves complicated procedures for loading and unloading the ELFI or FIVA proportional valves, and incurs significant costs in both testing and time. Therefore, there is an urgent need for a portable device for detecting internal leaks in the proportional valves of the electronic fuel injection main unit in diesel engines. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a portable diesel engine proportional valve internal leakage detection system that can realize on-site detection, reduce detection costs, and shorten detection time.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a portable diesel engine proportional valve internal leakage detection system, comprising:

[0008] Pilot valve test plate: It has a first hole, a second hole, a third hole and a first fixing hole, wherein the first fixing hole matches the fixing hole of the pilot valve so that when the pilot valve test plate is fixed between the pilot valve and the main valve through the first fixing hole, the first hole is connected to the venting flow channel of the pilot valve, the second hole is connected to the main oil flow channel of the pilot valve, and the third hole is connected to the control flow channel of the pilot valve.

[0009] The main valve test plate has a fourth hole, multiple fifth holes, and a second fixing hole. The second fixing hole matches the fixing hole of the main valve so that after the main valve test plate is fixed to the main valve through the second fixing hole, the fourth hole is connected to the venting channel of the main valve, and the fifth hole is connected to the hydraulic oil flow channel of the corresponding main valve.

[0010] The distribution block has a main channel inside, and the outlet end of the main channel is equipped with an outlet pipe with a flow detection element. The main channel is also connected to a first branch channel and a second branch channel. The inlet ends of the first branch channel and the second branch channel are equipped with switching valves. The switching valve of the first branch channel can be connected to the first hole through a pipe, and the switching valve of the second branch channel can be connected to the fourth hole through a pipe.

[0011] Optionally, the outlet end of the outlet tube extends into the measuring cup.

[0012] Optionally, the switching valve is a quick-connect ball valve.

[0013] Optionally, the dispensing block is located inside the toolbox, the outlet end of the liquid outlet pipe extends into the measuring cup, and the flow detection element is located inside the toolbox and connected to the power supply inside the toolbox.

[0014] Optionally, the pipe may be a resin pipe.

[0015] Optionally, a signal generator may also be included, which is connected to the pilot valve to output a set current to the pilot valve.

[0016] Optionally, the main valve test plate is provided with five sets of fifth holes. Correspondingly, the proportional valve to be tested is a FIVE proportional valve, and the five sets of fifth holes are respectively matched with the corresponding hydraulic flow channels on the FIVE proportional valve.

[0017] Optionally, the main valve test plate is provided with three sets of fifth holes. Correspondingly, the proportional valve to be tested is an ELFI proportional valve, and the three sets of fifth holes are respectively matched with the corresponding hydraulic flow channels on the ELFI proportional valve.

[0018] Optionally, a temperature sensing element may also be included for detecting the temperature of the pipe.

[0019] Secondly, an embodiment of the present invention provides a method for detecting internal leakage of a portable diesel engine proportional valve, comprising the following steps:

[0020] Install the pilot valve test plate between the pilot valve and the main valve through the first fixing hole and the threaded fastener, and connect the vent hole of the pilot valve to the first hole of the pilot valve test plate;

[0021] The main valve test plate is installed on the main valve through the first fixing hole and threaded fasteners, and the main valve test plate is positioned between the main valve and the distribution block. The vent hole of the main valve is connected to the fourth hole of the main valve test plate.

[0022] The first hole of the pilot valve test plate is connected to the switch valve of the first branch channel of the distribution block via a pipe, and the fourth hole of the main valve test plate is connected to the switch valve of the second branch channel via a pipe.

[0023] Adjust the main unit where the proportional valve is located to reach the standby state, so that the hydraulic oil flowing into the hydraulic passage of the main valve in the main oil circuit reaches the set pressure;

[0024] Control the pilot valve to operate, so that the valve core of the pilot valve is in the neutral position, open the switch valve of the first branch channel, close the switch valve of the second branch channel, record the value of the flow detection element, and realize the leakage measurement of the pilot valve.

[0025] The pilot valve is controlled to operate, so that the valve core of the main valve is in the neutral position, the switching valve of the second branch channel is opened, the switching valve of the first branch channel is closed, and the value of the flow detection element is recorded to realize the leakage measurement of the main valve.

[0026] The beneficial effects of this invention are as follows:

[0027] The detection system of this invention includes a pilot valve test plate and a main valve test plate. The pilot valve test plate has a first fixing hole, which can be fixed between the pilot valve and the main valve through the first fixing hole and a threaded fastener. This allows hydraulic oil to be led out from the pilot valve vent hole using the first hole, and the amount of hydraulic oil leakage can be detected using a distribution block and a flow detection element. The pilot valve test plate, the main valve test plate, and the corresponding pipes, switching valves, distribution pipes, outlet pipes, and other components are small in size and easy to carry. Therefore, the detection of internal leakage can be carried out on-site on the ship, reducing detection costs and shortening detection time. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 This is a schematic diagram of the pilot valve test plate structure in Embodiment 1 of the present invention;

[0030] Figure 2 This is a front view of the pilot valve test plate of Embodiment 1 of the present invention;

[0031] Figure 3 This is the present invention. Figure 2 A schematic diagram of the section along direction A;

[0032] Figure 4 This is a top view of the pilot valve test plate of Embodiment 1 of the present invention;

[0033] Figure 5This is a bottom view of the pilot valve test plate of Embodiment 1 of the present invention;

[0034] Figure 6 This is a top view of the main valve test plate in Embodiment 1 of the present invention;

[0035] Figure 7 This is a schematic diagram of the allocation block structure in Embodiment 1 of the present invention;

[0036] Figure 8 This is a schematic diagram of the assembly of the detection system and the proportional valve in Embodiment 2 of the present invention. Figure 1 ;

[0037] Figure 9 This is a schematic diagram of the assembly of the detection system and the proportional valve in Embodiment 2 of the present invention. Figure 2 ;

[0038] Figure 10 This is a schematic diagram of the assembly of the detection system and the proportional valve in Embodiment 2 of the present invention. Figure 3 ;

[0039] Figure 11 This is a schematic diagram of the installation process of the pilot valve test plate and the main valve test plate in Embodiment 2 of the present invention;

[0040] Figure 12 This is a schematic diagram of the detection principle of Embodiment 2 of the present invention;

[0041] Figure 13 This is a top view of the main valve test plate in Embodiment 3 of the present invention;

[0042] Figure 14 This is the present invention. Figure 13 Schematic diagram of the G-direction section in the diagram;

[0043] Figure 15 This is a side view of the main valve test plate in Embodiment 3 of the present invention;

[0044] Figure 16 This is a side view and bottom view of the main valve in Embodiment 3 of the present invention;

[0045] Figure 17 This is a schematic diagram of the detection system method of Embodiment 3 of the present invention;

[0046] The components are as follows: 1. Pilot valve test plate, 1-1. First hole, 1-2. Second hole, 1-3. Third hole, 1-4. First fixing hole; 2. Main valve test plate, 2-1. Second fixing hole, 2-2. Fourth hole, 2-3. Fifth hole; 3. Toolbox; 4. Distribution block, 4-1. Main flow channel, 4-2. Third fixing hole, 4-3. First branch flow channel, 4-4. Second branch flow channel; 5. Discharge pipe; 6. Measuring cup; 7. Measuring clamp; 8. Display screen; 9. Power supply; 10. Ф8 quick-connect ball valve; 11. First pipe; 12. Ф10 quick-connect ball valve; 13. Second pipe; 14. Fixing block; 15. Pilot valve; 16. Main valve. Detailed Implementation

[0047] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Example 1

[0049] This embodiment provides a portable diesel engine proportional valve internal leakage detection system, wherein the proportional valve is a FIVE proportional valve.

[0050] The ELFI proportional valve includes a pilot valve and a main valve. The pilot valve is provided with a venting channel (T channel), a main oil circuit channel (P channel), and a control channel (A channel). A valve core is provided inside the pilot valve core. The valve core can move to switch the state of connection between the P channel and the A channel, and between the A channel and the T channel. When the P channel and the A channel are connected, the hydraulic oil in the main oil circuit can flow through the P channel and the A channel in sequence and then enter the control chamber of the main valve to control the movement of the valve core of the main valve. When the valve core of the pilot valve moves to the point where the A channel and the T channel are connected, the hydraulic oil can flow out from the control chamber of the main valve in sequence through the A channel and the T channel, thereby realizing the return oil.

[0051] The above-mentioned technologies can be achieved using existing technologies, and will not be described in detail here.

[0052] The main valve has five sets of hydraulic channels inside to control fuel injection and exhaust valve operation, namely the high-pressure oil inlet channel (P channel), the fuel booster drive cylinder inlet / outlet channel (Cfi channel), the fuel booster drive cylinder return channel (Tfi channel), the exhaust valve drive cylinder inlet / outlet channel (Cva channel), and the exhaust valve drive cylinder return channel (Tva channel).

[0053] The main valve is equipped with a valve core to switch between different flow channel working states. The main valve is also equipped with two discharge channels.

[0054] The main valve core has control chambers on both the left and right sides, with one of the control chambers connected to the A flow channel of the pilot valve.

[0055] When the main valve spool is in the neutral position, the spool blocks the high-pressure oil inlet channel, and the hydraulic oil will not flow in other channels.

[0056] The structure and working principle of the main valve described above can be achieved using existing structures, and will not be described in detail here.

[0057] The detection system of this embodiment includes a pilot valve test plate 1, a main valve test plate 2, and a toolbox 3. A distribution block 4 is provided inside the toolbox, and a main channel is provided inside the distribution block 4. The liquid outlet end of the main channel is connected to one end of the liquid outlet pipe 5, and the other end of the liquid outlet pipe 5 extends out of the toolbox and into the measuring cup 6. The measuring cup 6 is fixed on the outer side of the toolbox 3.

[0058] like Figures 1-5 As shown, the pilot valve test plate 1 includes a plate body with a first hole 1-1, a second hole 1-2, and a third hole 1-3. The plate body also has a first fixing hole 1-4, which matches the fixing hole of the pilot valve for fixing to the main valve. After removing the pilot valve from the main valve, the pilot valve test plate is placed between the main valve and the pilot valve, with the first fixing hole 1-4 aligned with the fixing hole on the pilot valve. Then, an extended bolt can be used to fix the pilot valve test plate between the main valve and the pilot valve.

[0059] The first hole 1-1 matches the T-channel of the pilot valve, so that after the pilot valve test plate 1 is fixed, the first hole 1-1 is connected to the T-channel. The first hole 1-1 adopts an L-shaped hole, one end of which extends to the end face of the pilot valve test plate 1 that contacts the pilot valve, and the other end extends to the side of the pilot valve test plate 1. The part extending to the side of the pilot valve test plate 1 is provided with an internal thread structure to facilitate connection with the pipeline.

[0060] The second hole 1-2 is a through hole that penetrates both surfaces of the pilot valve test plate. The second hole 1-2 matches the A flow channel of the pilot valve, so that after the pilot valve test plate is fixed, the second hole 1-2 is connected to the A flow channel.

[0061] The third hole 1-3 is matched with the P-channel of the pilot valve, so that after the pilot valve test plate is fixed, the third hole is connected to the P-channel.

[0062] like Figure 6As shown, the main valve test plate 2 includes a plate body, on which a second fixing hole 2-1 is provided. The second fixing hole 2-1 matches the fixing hole on the main valve used to fix the main valve. After the main valve is removed, the main valve test plate is placed between the main valve and its original support component. Then, an extended bolt can be used to fix the main valve test plate between the main valve and its original support component.

[0063] The main valve is provided with two fourth holes 2-2. After the main valve is fixed with the main valve test plate, the two fourth holes 2-2 are respectively connected to the two relief channels of the main valve. The main valve is also provided with five sets of fifth holes 2-3. The five sets of fifth holes 2-3 are respectively connected to the five sets of hydraulic flow channels on the main valve. After the main valve is fixed with the main valve test plate 2, the fifth holes 2-3 are connected to their corresponding hydraulic flow channels.

[0064] The fourth hole 2-2 is an L-shaped hole, with one end extending to the surface of the main valve test plate that contacts the main valve, and the other end extending to the side of the main valve test plate. The part extending to the side of the main valve test plate is provided with an internal thread structure to facilitate connection with the pipeline.

[0065] like Figure 7 As shown, the distribution block 4 is fixed to the inner side of one side wall of the toolbox 3 through the third fixing hole 4-2 and bolts. The main channel 4-1 is connected to a first branch channel 4-3 and two second branch channels 4-4. The first branch channel 4-3 and the second branch channels 4-4 can introduce leaked hydraulic oil into the main channel 4-1. The liquid outlet end of the main channel 4-1 is connected to one end of the liquid outlet pipe 5. The other end of the liquid outlet pipe 5 extends to the outside of the toolbox 3 and into the measuring cup 6. The measuring cup 6 is a 500ml measuring cup. The measuring cup 6 is fixed to the outer side of the toolbox or the liquid outlet pipe 5 does not extend to the outside of the toolbox 3 and the measuring cup 6 is fixed inside the toolbox 3.

[0066] A flow detection element is installed on the outlet pipe 5, and a flow sensor is used for the temperature detection element. The measuring clip 7 of the flow sensor is installed on the outlet pipe 5, and its display screen 8 is installed inside the toolbox 3. The flow sensor is connected to the power supply 9 inside the toolbox 3 and is powered by the power supply 9. In this embodiment, the power supply is a 24V power supply.

[0067] The first branch channel 4-3 is provided with an internal thread structure, through which a switch valve can be connected. The switch valve is a quick-connect ball valve, one end of which is socketed to one end of the first pipe 11, and the other end of the first pipe 11 can be threaded to the first hole 1-1. In this embodiment, the first pipe is a Ф8 diameter resin pipe, and correspondingly, the quick-connect ball valve of the first branch channel 4-3 is a Ф8 quick-connect ball valve 10.

[0068] Both second branch channels 4-4 are equipped with internal thread structures, which can be connected to the switch valves. The switch valves here are quick-connect ball valves. One end of the quick-connect ball valve is connected to one end of the second pipe, and the other end of the second pipe can be connected to the fourth hole threadedly, so that the main valve test plate is set between the main valve and the distribution block.

[0069] In this embodiment, the second pipe 13 is a Ф10 resin pipe, and correspondingly, the switching valve of the second branch flow channel is a Ф10 quick-connect ball valve 12.

[0070] To ensure the stability of the liquid outlet pipe, a fixing block 14 is provided at the end of the liquid outlet pipe. The fixing block 14 is fixed inside the toolbox 3 to support the liquid outlet pipe 5.

[0071] The detection system in this embodiment also includes a signal generator, which can output a current of a set magnitude. The signal generator can be connected to the pilot valve via a data line to control the operation of the pilot valve core.

[0072] The detection system in this embodiment also includes a temperature detection element for detecting the temperature of the first pipe and the second pipe. The temperature detection element is a point thermometer.

[0073] Example 2

[0074] This embodiment provides a working method for the portable diesel engine proportional valve internal leakage detection system described in Embodiment 1, such as... Figures 8-12 As shown, it includes the following steps:

[0075] Step 1: Install the pilot valve test plate between the pilot valve 15 and the main valve 16 of the proportional valve to be tested. Specifically, remove the pilot valve from the main valve, remove the original parts that mate with the pilot valve's vent passage, and then place the pilot valve test plate between the main valve and the pilot valve. After aligning the first fixing hole with the pilot valve's fixing hole, screw in the extended fixing bolt (25mm longer than the original bolt) to fix the pilot valve test plate to the main valve and the pilot valve. At this point, the first hole disconnects the vent hole of the pilot valve from the vent hole of the main valve.

[0076] Install the main valve test plate between the original main valve support component and the proportional valve. Specifically, after removing the main valve from its support component, remove the original main valve venting flow channel fitting component, place the main valve test plate between the main valve and its support component, align the second fixing hole with the main valve fixing hole, and screw in the extended fixing bolt (40mm longer than the original bolt) to fix the main valve test plate. At this time, the fifth hole on the main valve test plate is aligned with the five sets of hydraulic flow channels of the main valve, and the fourth hole is aligned with the venting flow channel of the main valve.

[0077] Step 2: Connect one end of the first pipe to the first hole via a threaded connector, connect the other end of the first pipe to the quick-connect ball valve of the first branch channel, connect one end of each of the two second pipes to the two fourth holes via threaded connectors, and connect the other ends of each of the two second pipes to the quick-connect ball valves of the two second branch channels.

[0078] Step 3: Adjust the main unit where the proportional valve is located to reach the standby state. The oil pressure injected into the main valve in the main oil circuit reaches the set pressure, which is 250 bar in this embodiment.

[0079] Step 4: Connect the signal generator to the pilot valve. Specifically, disconnect the J70 (B, C) channel on the CCU1 board inside the host ECC control, that is, cut off the host's control over the pilot valve, and connect the control line of the disconnected pilot valve to the signal generator through the data cable.

[0080] Step 5: Obtain information on leakage from the pilot valve and main valve.

[0081] (1) Start the signal generator. The signal generator outputs the first set current to control the movement of the pilot valve core, so that the A flow channel of the pilot valve is not connected to the T flow channel or the P flow channel, that is, the pilot valve is in the neutral position. Close the quick-connect ball valve of the second branch flow channel and open the quick-connect ball valve of the first branch flow channel. Turn on the power. The hydraulic oil leaking from the pilot valve enters the first hole through the T flow channel, and then flows into the measuring cup through the first pipe, the quick-connect ball valve, the first branch flow channel, the main flow channel, and the outlet pipe. The flow sensor works. Use a spot thermometer to measure the current temperature of the first pipe and record the value of the flow sensor over 5 minutes to obtain the leakage status of the pilot valve.

[0082] (2) Adjust the signal generator. The signal generator outputs a second set current. The second set current causes the hydraulic oil output from the A flow channel of the first valve to the main valve control chamber to drive the valve core of the main valve to the neutral position. That is, the high pressure oil inlet of the main valve is not connected to any other flow channel. Close the quick-connect ball valve of the first branch flow channel and open the quick-connect ball valve of the second branch flow channel. The hydraulic oil leaking from the main valve flows into the measuring cup after passing through the discharge channel, the fourth hole, the second pipe, the second branch flow channel, the main flow channel and the outlet pipe. Start the power supply and the flow sensor works. Use a spot thermometer to measure the current temperature of the second pipe and record the value of the flow sensor within 5 minutes to obtain the leakage status of the main valve.

[0083] The detection system in this embodiment has small-sized pilot valve test plate, main valve test plate, and corresponding pipes, switching valves, distribution pipes, outlet pipes, and other components, which are easy to carry. Therefore, the detection of internal leaks can be carried out on-site on the ship, reducing detection costs and shortening detection time.

[0084] Example 3:

[0085] This embodiment provides a portable diesel engine proportional valve internal leakage detection system, which differs from Embodiment 1 only in that the proportional valve to be tested is an ELFI proportional valve. Figure 13-16 As shown, its main valve is equipped with three sets of hydraulic channels to control fuel injection, namely the P channel, the T channel and the A channel. Correspondingly, the main valve test plate is also equipped with three sets of fifth holes. Other structures are the same as in Embodiment 1, and will not be described in detail here.

[0086] like Figure 17 As shown, its working method is the same as that in Example 2, and will not be described again here.

[0087] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A portable diesel engine proportional valve internal leakage detection system, characterized in that, include: The pilot valve test plate has a first hole, a second hole, a third hole, and a first fixing hole. The first fixing hole matches the fixing hole of the pilot valve used to fix it on the main valve. After the pilot valve is removed from the main valve, the pilot valve test plate is placed between the main valve and the pilot valve. The first fixing hole is aligned with the fixing hole on the pilot valve. Then, an extended bolt is used to fix the pilot valve test plate between the main valve and the pilot valve. The first fixing hole matches the fixing hole of the pilot valve so that when the pilot valve test plate is fixed between the pilot valve and the main valve through the first fixing hole, the first hole is connected to the venting flow channel of the pilot valve, the second hole is connected to the main oil flow channel of the pilot valve, and the third hole is connected to the control flow channel of the pilot valve. The main valve test plate has a fourth hole, multiple fifth holes, and a second fixing hole. The second fixing hole matches the fixing hole on the main valve used to fix the main valve. After the main valve is removed, the main valve test plate is placed between the main valve and its original support component. Then, an extended bolt is used to fix the main valve test plate between the main valve and its original support component. The second fixing hole matches the fixing hole of the main valve so that after the main valve test plate is fixed to the main valve through the second fixing hole, the fourth hole is connected to the venting channel of the main valve, and the fifth hole is connected to the hydraulic oil flow channel of the corresponding main valve. The main valve test plate has three sets of fifth holes. Correspondingly, the proportional valve to be tested is an ELFI proportional valve, and the three sets of fifth holes are respectively matched with the corresponding hydraulic flow channels on the ELFI proportional valve. The distribution block has a main channel inside, and the outlet end of the main channel is equipped with an outlet pipe with a flow detection element. The main channel is also connected to a first branch channel and a second branch channel. The inlet ends of the first branch channel and the second branch channel are equipped with switching valves. The switching valve of the first branch channel can be connected to the first hole through a pipe, and the switching valve of the second branch channel can be connected to the fourth hole through a pipe.

2. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, The outlet end of the outlet tube extends into the measuring cup.

3. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, The switching valve is a quick-connect ball valve.

4. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, The dispensing block is located inside the toolbox, the outlet end of the liquid outlet pipe extends into the measuring cup, and the flow detection element is located inside the toolbox and connected to the power supply inside the toolbox.

5. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, The pipeline is made of resin.

6. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, It also includes a signal generator, which is used to connect to the pilot valve to output a set current to the pilot valve.

7. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, The main valve test plate is provided with five sets of fifth holes. Correspondingly, the proportional valve to be tested is a FIVE proportional valve, and the five sets of fifth holes are respectively matched with the corresponding hydraulic flow channels on the FIVE proportional valve.

8. The portable diesel engine proportional valve internal leakage detection system as described in claim 1, characterized in that, It also includes a temperature sensing element for detecting the temperature of the pipe.

9. A method for detecting internal leakage of a portable diesel engine proportional valve according to any one of claims 1-8, characterized in that, Includes the following steps: Install the pilot valve test plate between the pilot valve and the main valve through the first fixing hole and the threaded fastener, and connect the vent hole of the pilot valve to the first hole of the pilot valve test plate; The main valve test plate is installed on the main valve through the first fixing hole and threaded fasteners, and the main valve test plate is positioned between the main valve and the distribution block. The vent hole of the main valve is connected to the fourth hole of the main valve test plate. The first hole of the pilot valve test plate is connected to the switch valve of the first branch flow channel of the distribution block through a pipe, and the fourth hole of the main valve test plate is connected to the switch valve of the second branch flow channel through a pipe. Adjust the main unit where the proportional valve is located to reach the standby state, so that the hydraulic oil flowing into the hydraulic passage of the main valve in the main oil circuit reaches the set pressure; Control the pilot valve to operate, so that the valve core of the pilot valve is in the neutral position, open the switch valve of the first branch flow channel, close the switch valve of the second branch flow channel, record the value of the flow detection element, and realize the leakage measurement of the pilot valve. The pilot valve is controlled to operate, so that the valve core of the main valve is in the neutral position, the switch valve of the second branch flow channel is opened, the switch valve of the first branch flow channel is closed, the value of the flow detection element is recorded, and the leakage measurement of the main valve is realized.

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