Vehicle emergency steering system module assembly

Abstract

The utility model belongs to automobile parts, especially involve a vehicle emergency steering system module assembly. The oil outlet of oil canister is communicated with the oil inlet of main oil pump, the oil outlet of main oil pump is connected with the first oil channel oil inlet of emergency valve, the first oil channel oil inlet of emergency valve is communicated with the first oil channel of emergency valve, the other end of the first oil channel of emergency valve is communicated with the oil outlet of emergency valve, the oil outlet of emergency valve is communicated with power steering gear, the oil outlet of electro -hydraulic pump is communicated with the second oil channel oil inlet of emergency valve, the second oil channel oil inlet of emergency valve is communicated with the second oil channel of emergency valve, the first oil channel of emergency valve and the second oil channel of emergency valve in emergency valve are communicated, the emergency valve is equipped with the valve core, is equipped with signal sensor on emergency valve, signal sensor and the controller of electro -hydraulic pump, waterproof plug joint body is hollow cylinder shape, be equipped with controller on electro -hydraulic pump, when main oil pump is out of order, oil supply is insufficient, and the oil in electro -hydraulic pump enters power steering gear through emergency valve and provides the support of power steering.

Description

Technical Field

[0001] This utility model pertains to automotive parts, and specifically relates to a vehicle emergency steering system module assembly. Background Technology

[0002] Vehicles inevitably experience malfunctions during use. If the main oil pump fails, it cannot supply oil to the steering system, preventing the vehicle from steering. This causes significant difficulties when handling a malfunctioning vehicle, such as when it needs to be transferred, repaired, or driven, and can lead to a series of production and safety hazards. Summary of the Invention

[0003] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a vehicle emergency steering system module assembly with a simple structure that can still have steering function when the vehicle's main oil pump cannot supply oil.

[0004] The technical solution adopted by this utility model to solve the technical problem is: a vehicle emergency steering system module assembly, including a main oil pump and an oil reservoir, characterized in that one oil outlet of the oil reservoir is connected to the oil inlet of the main oil pump to supply oil to the main oil pump; the oil outlet of the main oil pump is connected to the oil inlet of the first oil passage of the emergency valve, the oil inlet of the first oil passage of the emergency valve is connected to the first oil passage of the emergency valve, the other end of the first oil passage of the emergency valve is connected to the oil outlet of the emergency valve, the oil outlet of the emergency valve is connected to the power steering gear; the other oil outlet of the oil reservoir is connected to the oil inlet of the electro-hydraulic pump, oil enters from the oil inlet of the electro-hydraulic pump and flows out from the oil outlet of the electro-hydraulic pump, the oil outlet of the electro-hydraulic pump is connected to the oil inlet of the second oil passage of the emergency valve, the oil inlet of the second oil passage of the emergency valve is connected to the second oil passage of the emergency valve, the other end of the second oil passage of the emergency valve is connected to the oil return port of the emergency valve, the oil return port of the emergency valve is connected to one oil inlet of the oil reservoir, and the emergency valve... The first and second oil passages of the emergency valve are connected. A valve core is located between the first and second oil passages. The valve core is displaced by the hydraulic oil. A terminal is located in the second oil passage, connected to a controller on the electro-hydraulic pump via a signal line, feeding back an electrical signal to the controller. A steel ball is also located inside the emergency valve, connected to a compression spring. When hydraulic oil flows through the steel ball, the oil pressure pushes the steel ball, causing the compression spring to contract. The steel ball does not contact the terminal, and the resulting voltage signal is fed back to the controller of the electro-hydraulic pump. Conversely, when hydraulic oil does not flow through the steel ball, the compression spring rebounds, ejecting the steel ball, which then contacts the terminal. This generates an opposite voltage signal, which is also fed back to the controller of the electro-hydraulic pump.

[0005] The outer end of the controller on the electro-hydraulic pump is secured with a controller cover by fastening bolts. The controller cover provides waterproofing and impact protection for the controller. An emergency valve is equipped with a signal sensor, and a signal line connects the signal sensor to the controller of the electro-hydraulic pump. A threaded hole is located on the controller cover corresponding to the location where the signal line connects. The waterproof plug body is a hollow cylinder. A thread is located on the outer cylindrical surface of the inner end of the waterproof plug body, connecting to the threaded hole on the controller cover. A shoulder is located at the tail end of the thread on the inner end of the waterproof plug body, with the left end face of the shoulder pressing against the outer end face of the controller cover. A waterproof rubber ring is located at the corner between the tail end of the inner end of the thread and the shoulder, positioned between the shoulder of the waterproof plug body and the controller cover, providing sealing, locking, and waterproofing. The outer end of the waterproof plug body is a hollow cylinder, with the outer end... The inner diameter of the hollow cylinder is larger than that of the inner hollow cylinder. A T-shaped waterproof seal is tightly inserted between the inner wall of the outer hollow cylinder and the outer wall of the signal line. A second thread is provided on the outer cylindrical surface of the outer cylinder. A second threaded hole is provided inside the waterproof seal cap. The second threaded hole and the second thread are connected by a threaded fastening. The thick part of the T-shaped structure of the waterproof seal is located inside the waterproof seal cap. The waterproof seal prevents water outside the waterproof seal cap from flowing into the controller along the signal line wall. After the signal line comes out from the emergency valve sensor, it passes through the waterproof seal cap, the waterproof seal, and the waterproof seal head in sequence from the outside to the inside, and then connects to the controller. This ensures a good seal between the controller and the controller cover, preventing water and moisture from entering the controller. This allows the electrical and control signals of the emergency steering module to work normally, ensuring that the steering system continues to work without being affected when the vehicle malfunctions.

[0006] The beneficial effects of this utility model are: the vehicle emergency steering system module assembly has a simple structure.

[0007] The electro-hydraulic pump is equipped with a controller, which is connected to a signal sensor on the emergency valve via a signal line. When the main pump is working normally, hydraulic oil with a pressure above the set threshold enters the emergency valve. At this time, the main pump supplies oil to the power steering system. The steel ball in the emergency valve is not in contact with the terminal, resulting in a high voltage. The oil output by the electro-hydraulic pump returns to the reservoir through the second oil passage and return port of the emergency valve. When the main pump fails, the oil supply is insufficient, and the oil pressure is lower than the preset threshold. The steel ball contacts the terminal, generating a low voltage. The electro-hydraulic pump accelerates, and the oil in the electro-hydraulic pump enters the power steering system through the emergency valve, thus providing power steering support. This ensures that the vehicle can continue to maintain steering function when there is a failure or when the main pump cannot supply oil to the power steering system, reducing production and safety hazards. The waterproof plug cap and the waterproof plug body are fastened together by threads. The thick part of the T-shaped structure of the waterproof plug seal fills the internal cavity of the waterproof plug cap, preventing water from continuing to enter from the area of ​​the waterproof plug cap. Compared with traditional glue sealing, it has higher reliability and better sealing performance, enabling the electro-hydraulic pump controller, an important component of the vehicle emergency steering system module assembly, to prevent water ingress and failure, increasing its service life, and more effectively ensuring the functional realization of the emergency steering system module assembly. Attached Figure Description

[0008] The following description, in conjunction with the accompanying drawings, illustrates specific embodiments.

[0009] Figure 1 This is a structural diagram showing the location of the waterproof plug used for the signal lines of the vehicle emergency steering system module assembly.

[0010] Figure 2 yes Figure 1 Enlarged view of point I in the image, and structural cross-sectional view of the waterproof plug.

[0011] Figure 3 This is the installation layout and interface diagram of the vehicle's emergency steering system.

[0012] Figure 4 This is an external interface view of the vehicle emergency steering system module assembly.

[0013] Figure 5 This is a view of the signal line connections for the vehicle emergency steering module assembly.

[0014] Figure 6 This is a schematic diagram of the main oil pump in normal working condition.

[0015] Figure 7 yes Figure 6 Diagram of the valve core status inside the emergency valve and schematic diagram of the oil supply circuit under normal operating conditions of the main oil pump.

[0016] Figure 8 This is a schematic diagram showing the operation of the electro-hydraulic pump when the main oil pump fails.

[0017] Figure 9 yes Figure 8 Diagram of the valve core status and oil supply circuit of the emergency valve under normal operating conditions.

[0018] In the diagram, 1-Longitudinal beam of the vehicle body; 2-Bracket; 3-Oil reservoir; 4-Main oil pump; 5-Power steering gear; 6-Electro-hydraulic pump; 6-1-Electro-hydraulic pump inlet; 6-2-Electro-hydraulic pump outlet; 7-Emergency valve; 7-1-Emergency valve first oil passage inlet; 7-2-Emergency valve first oil passage; 7-3-Emergency valve outlet; 7-4-Emergency valve second oil passage inlet; 7-5-Emergency valve second oil passage; 7-6-Emergency valve return port; 7-7-Valve core; 8-Controller; 9-Controller cover; 10-Waterproof plug body; 11-Waterproof plug rubber ring; 12-Waterproof plug cap; 13-Waterproof plug sealing body; 14-Signal wire; 15-Signal sensor; 16-Shock absorber bolt; 17-Signal interface; 18-Power interface; 19-Threaded hole one; 20-Threaded hole two; 21-Terminal; 22-Steel ball. Detailed Implementation

[0019] Example 1, refer to Appendix Figure 1-5The vehicle emergency steering system module assembly signal line is secured to the vehicle body longitudinal beam 1 by a triangular frame bracket 2 with multiple bolts, using a waterproof plug. An electro-hydraulic pump 6 is securely connected to the upper platform of the bracket 2. Four shock-absorbing bolts 16 are installed on the inclined beam of the bracket 2 and connected to the side face of the electro-hydraulic pump 6. These bolts, along with the horizontal bolts on the bracket 2, provide a reinforcement of the electro-hydraulic pump 6. The shock-absorbing bolts 16 also dampen vibrations, buffering the force transmitted from the bracket 2 to the electro-hydraulic pump 6 when the vehicle vibrates or bumps, thus ensuring the electro-hydraulic pump 6 operates firmly and stably. An emergency valve 7 is secured to the vertical frame of the bracket 2, which extends upwards from the inclined beam, with two bolts. A signal sensor 15 is installed on the emergency valve 7, and a signal line 14 is connected outwards from the signal sensor 15. The connection between the signal line 14 and the signal sensor 15 is waterproofed. An electro-hydraulic pump inlet 6-1 is provided at one end of the electro-hydraulic pump 6, and an electro-hydraulic pump outlet 6-2 is provided on the electro-hydraulic pump 6 in the direction perpendicular to the electro-hydraulic pump inlet 6-1. The electro-hydraulic pump inlet 6-1 and the electro-hydraulic pump outlet 6-2 are connected. An electro-hydraulic pump controller 8 is provided at the end opposite to the electro-hydraulic pump inlet 6-1. The electro-hydraulic pump controller 8 is used to receive the signal from the emergency valve 7 and control the operation and oil supply of the electro-hydraulic pump 6. The exposed part of the electro-hydraulic pump controller 8 is covered by a controller cover 9. The controller cover 9 is fastened to the controller 8 with multiple bolts, so that the controller cover 9 can prevent the controller 8 from being bumped, liquid, and foreign objects from entering. The controller cover 9 securely seals the controller 8. The signal line 14 connected from the signal sensor 15 passes through the controller cover 9 and connects to the signal connection module of the controller 8. Since the area where the signal line 14 passes through the controller cover 9 and connects to the controller 8 is the core part of the controller 8, where electronic components, circuit modules, and wiring are concentrated, waterproofing of this part is particularly important. No external liquids should flow into the controller 8 through the signal line 14, otherwise it will cause short circuits and other controller malfunctions.A threaded hole 19 is provided on the controller cover 9 corresponding to the location where the signal line 14 is connected to the controller 8. The waterproof plug body 10 is a hollow cylinder. A thread is provided on the outer cylindrical surface of the inner end of the waterproof plug body 10. The thread is threaded to the threaded hole 19 on the controller cover 9. A shoulder is provided at the tail end of the thread at the inner end of the waterproof plug body 10. The left end face of the shoulder presses against the outer end face of the controller cover 9. A waterproof rubber ring 11 is provided at the corner between the tail end of the inner thread and the shoulder. The waterproof rubber ring 11 is located between the shoulder of the waterproof plug body 10 and the controller cover 9, and plays a role in sealing, clamping and waterproofing. The outer end of the waterproof plug body 10 is a hollow cylinder. The inner diameter of the hollow cylinder at the outer end is larger than the inner diameter of the hollow cylinder at the inner end. The inner wall of the hollow cylinder at the outer end is connected to the outer edge of the signal line 14. A T-shaped waterproof sealing body 13 is tightly packed between the walls. A second thread is provided on the outer cylindrical surface of the outer end. A threaded hole 20 is provided inside the waterproof plug cap 12, and the threaded hole 20 is threadedly fastened to the second thread. The thicker part of the T-shaped structure of the waterproof plug sealing body 13 is located inside the waterproof plug cap 12. The waterproof plug sealing body prevents water outside the waterproof plug cap from flowing into the controller along the signal line wall. After exiting the emergency valve signal sensor 15, the signal line 14 passes tightly and sequentially through the waterproof plug cap 12, the waterproof plug sealing body 13, and the waterproof plug cap 10 from the outside in, and then connects to the controller 8. This ensures a good seal between the controller 8 and the controller cover 9, preventing water and moisture from entering the controller 8. This allows the electrical and control signals of the emergency steering module to function normally, ensuring that the steering system continues to operate without being affected when the vehicle malfunctions.

[0020] See attached document Figure 1-9The working principle of the vehicle emergency steering system module assembly is as follows: An emergency valve 7 is equipped with a signal sensor 15, which is connected to a signal line 14. The signal line 14 passes through the controller cover 9 and connects to the signal connection module of the electro-hydraulic pump controller 8. The emergency valve contains a first emergency valve oil passage 7-2 and a second emergency valve oil passage 7-5. The outlet of the main oil pump 4 is connected to the inlet 7-1 of the first emergency valve oil passage. The inlet 7-1 of the first emergency valve oil passage is connected to the first emergency valve oil passage 7-2. The other end of the first emergency valve oil passage 7-2 is connected to the outlet 7-3 of the emergency valve, which is connected to the power steering gear 5. The electro-hydraulic pump 6 is equipped with an electro-hydraulic pump inlet 6- 1. The oil outlet 6-2 of the electro-hydraulic pump, the oil inlet 6-1 of the electro-hydraulic pump, and the oil outlet 6-2 of the electro-hydraulic pump are connected. One oil outlet of the oil reservoir 3 is connected to the oil inlet 6-1 of the electro-hydraulic pump. The oil outlet 6-2 of the electro-hydraulic pump is connected to the oil inlet 7-4 of the second oil passage of the emergency valve. The oil inlet 7-4 of the second oil passage of the emergency valve is connected to the second oil passage 7-5 of the emergency valve. The other end of the second oil passage 7-5 of the emergency valve is connected to the return oil port 7-6 of the emergency valve. The return oil port 7-6 of the emergency valve is connected to one oil inlet of the oil reservoir 3. The first oil passage 7-2 and the second oil passage 7-5 of the emergency valve are connected. A valve core 7-7 is installed between the first oil passage 7-2 and the second oil passage 7-5 of the emergency valve. The valve core 7-7 is displaced under the push of hydraulic oil. A terminal 21 is provided in the second oil passage 7-2. The terminal 21 is connected to the controller 8 on the electro-hydraulic pump via a signal line, feeding back the electrical signal to the controller 8. A steel ball 22 is also provided in the emergency valve 7, connected to a compression spring. The compression spring is fixed inside the emergency valve. When the main oil pump 4 is working normally, it provides oil pressure greater than the threshold. At this time, the hydraulic oil pressure pushes the valve core 7-7 to displace, and the emergency valve 7 is in the open state. When the vehicle starts moving, the electro-hydraulic pump 6 works, and the oil in the electro-hydraulic reservoir 3 enters the electro-hydraulic pump 6, flows out from the electro-hydraulic pump outlet 6-2, and then flows into the emergency valve's second oil passage inlet 7-4, entering the emergency valve's second oil passage 7-5. At this time, the main oil pump 4 is working normally. The hydraulic oil entering the second oil passage 7-5 of the emergency valve from the electro-hydraulic pump 6 pushes the steel ball 22 in the oil passage away. The steel ball compresses the spring and maintains a balance under the spring force and the pressure of the hydraulic oil. At this time, the steel ball does not contact the terminal 21 on the valve core 7-7. The terminal 21 is in an insulated state, and the generated voltage is high level. This voltage signal is transmitted to the controller 8 through the signal sensor 15 and the signal line 14. The hydraulic oil output from the electro-hydraulic pump in the second oil passage 7-5 of the emergency valve returns to the oil reservoir 3 through the emergency valve return port 7-6. In this way, the flow acquisition module, signal generation module and oil pump control module in the controller 8 determine that the main oil pump 8 is in normal working condition, and the main oil pump 8 continuously supplies oil to the power steering system.When the main hydraulic pump 4 malfunctions or its oil supply is insufficient, the hydraulic oil output by the main hydraulic pump 4 is not pressurized enough to push the valve core 7-7 open and generate displacement. At this time, the emergency valve 7 is closed. When the vehicle starts to move at a certain speed, the electro-hydraulic pump 6 starts to enter the power steering system 5 through the emergency valve outlet 7-3. Since the oil flowing to the second oil passage 7-5 of the emergency valve does not flow to the return oil port 7-6 of the emergency valve, no oil flows through the steel ball 22, and therefore there is no oil pressure to push the steel ball 22. The steel ball rebounds under the action of the compression spring and contacts the terminal 21. Due to the contact between the terminal 21 and the steel ball 22, the signal line voltage of the emergency valve is low. This signal is transmitted to the controller 8 of the electro-hydraulic pump 6 through the signal sensor 15 and the signal line 14. The controller 8 considers the main hydraulic pump 4 to be faulty, and the electro-hydraulic pump 6 accelerates to supply oil to the power steering system 5, thus completing the emergency steering function. The signal module of the electro-hydraulic pump 6 is connected to the vehicle's signal interface 17, and the power module of the electro-hydraulic pump 6 is connected to the vehicle's power interface 18. The controller 8 of the electro-hydraulic pump 6 includes a flow acquisition module, a signal generation module, a pump control module, and a steering control module. The flow acquisition module acquires the vehicle's speed and the main pump's fuel supply flow rate. A threshold can be set for both speed and flow rate; when both conditions are met, the main pump operates normally; when either condition is not met, the electro-hydraulic pump is required to supply fuel. The signal generation module generates a corresponding signal when the conditions set by the flow acquisition module are met; that is, the threshold set in the flow acquisition module is the vehicle speed and the main pump's fuel supply flow rate. When the oil level is normal, the signal generation module generates a normal trigger signal. When the threshold set in the flow acquisition module is not met, the signal generation module generates an "abnormal" trigger signal. When the vehicle speed reaches a certain condition, the electro-hydraulic pump 6 needs to supply oil. The function of the oil pump control module is to control the flow rate of the electro-hydraulic pump 6 to supply oil based on the "abnormal" trigger signal generated in the signal generation module, so that the total oil supply to the power steering 5 is not less than the preset value. The function of the steering control module is to control the vehicle steering based on the oil supply of the main oil pump 4 and the electro-hydraulic pump 6. If the flow acquisition module does not obtain the threshold information during vehicle operation, it proves that the main oil pump is working normally. If the signal generation module does not generate an "abnormal" signal, the main oil pump 4 will continue to supply oil. The oil enters the emergency valve first oil passage inlet 7-1, emergency valve first oil passage 7-2 and emergency valve outlet 7-3 through the main oil pump 4, and then enters the power steering 5 to provide hydraulic support for power. At this time, the emergency valve first oil passage 7-2 and emergency valve second oil passage 7-5 are not connected, but are closed by the control of valve core 7-7. The oil from the oil reservoir 3 returns to the oil reservoir 3 through the electro-hydraulic pump inlet 6-1, electro-hydraulic pump outlet 6-2, emergency valve second oil passage inlet 7-4, emergency valve second oil passage 7-5 and emergency valve return port 7-6. At this time, the main oil pump 4 is in normal working condition.When the main hydraulic pump 4 is in a faulty state or the oil supply is insufficient, the flow acquisition module obtains relevant information and generates a signal. When the vehicle speed reaches a certain set condition, it indicates that the power steering needs to work. At this time, the main hydraulic pump 4 is already in a faulty state, so the signal generation module will generate an "abnormal" signal, which means that the electro-hydraulic pump 6 needs to supply oil to the power steering 5. At this time, the valve core 7-7 is in the open state, and the first oil passage 7-2 and the second oil passage 7-5 of the emergency valve are connected. The oil in the electro-hydraulic pump 6 enters the first oil passage 7-2 of the emergency valve through the second oil passage 7-5 of the emergency valve and then enters the power steering 5, completing the power emergency steering function in the case of the main hydraulic pump 4 failure.

[0021] See attached document Figure 6-9 These four figures illustrate a specific implementation of how the main oil pump 4 and electro-hydraulic pump 6 supply oil in the emergency steering system module assembly. Figure 6 This is a schematic block diagram of the main hydraulic pump operating normally. At this time, the main hydraulic pump 4 provides hydraulic oil at a rate greater than 8 L / min into the first oil passage 7-2 of the emergency valve 7. The hydraulic oil pushes the valve core 7-7, flowing out from the outlet 7-3 of the emergency valve to provide power oil to the power steering unit 5. The emergency valve 7 is in the open state. When the vehicle speed is greater than 5 km / h, the electro-hydraulic pump 6 operates at a low speed of 1500 rpm. The hydraulic oil in the electro-hydraulic pump 6 enters the second oil passage 7-5 of the emergency valve 7 through the inlet 7-4. (Refer to...) Figure 7 At this time, the hydraulic oil flows out from the emergency valve return port 7-6 in the second oil passage 7-5 of the emergency valve and returns to the oil reservoir 3. The force of the oil pushes the steel ball 22 away from the terminal 21, so the steel ball 22, valve body, and terminal 21 are not in contact, the terminal 21 is in an insulated state, the voltage of the electro-hydraulic pump signal line is high, the main oil pump 4 is determined to be in normal condition, the signal information of the flow acquisition module is normal, and the signal generation module gives a "normal" signal. (See attached...) Figure 8 ① When the main oil pump 4 malfunctions or the oil supply is insufficient (flow rate less than 6L / min), the valve core 7-7 of the emergency valve 7 is not pushed and returns to the starting position, and the emergency valve 7 is in the closed state; the flow acquisition module generates signal information; ② When the vehicle speed is greater than 5km / h, that is, when the vehicle starts to run and there is a need for steering, the emergency valve 7 is closed at this time. The hydraulic oil supplied by the electro-hydraulic pump 6 enters through the second oil passage 7-5 of the emergency valve and flows out through the oil outlet 7-3 of the emergency valve. Because the hydraulic oil of the electro-hydraulic pump 6 no longer flows through the return oil outlet 7-6 of the emergency valve, the steel ball has no oil pressure thrust and is only pushed by the rebound force of the connected compression spring. Refer to the appendix. Figure 9When the signal line voltage of the electro-hydraulic pump 6 is low, it is determined that the main oil pump 4 is faulty. Based on the information generated by the flow acquisition module, the signal generation module also generates a signal information, which is an "abnormal" signal. In order to ensure that the power steering does not fail, the oil pump control module needs to provide sufficient oil supply to the power steering. The electro-hydraulic pump 6 speeds up (4500rpm) and inputs hydraulic oil into the power steering gear 5 to complete the steering function required by the steering control module.

Claims

1. A vehicle emergency steering system module assembly, comprising a main oil pump (4) and an oil reservoir (3), characterized in that, One outlet of the oil reservoir (3) is connected to the inlet of the main oil pump (4). The outlet of the main oil pump (4) is connected to the inlet of the first oil passage of the emergency valve (7-1). The inlet of the first oil passage of the emergency valve (7-1) is connected to the first oil passage of the emergency valve (7-2). The other end of the first oil passage of the emergency valve (7-2) is connected to the outlet of the emergency valve (7-3). The outlet of the emergency valve (7-3) is connected to the power steering gear (5). The other outlet of the oil reservoir (3) is connected to the inlet of the electro-hydraulic pump (6-1). The oil enters from the inlet of the electro-hydraulic pump (6-1) and flows out from the outlet of the electro-hydraulic pump (6-2). The outlet of the electro-hydraulic pump (6-2) is connected to the inlet of the second oil passage of the emergency valve (7-4). The inlet of the second oil passage of the emergency valve (7-4) is connected to the inlet of the first oil passage of the emergency valve (7-2). The second oil passage (7-5) of the emergency valve is connected to the return port (7-6) of the emergency valve at the other end. The return port (7-6) of the emergency valve is connected to one of the oil inlets of the oil reservoir. The first oil passage (7-2) and the second oil passage (7-5) of the emergency valve (7) are connected. The emergency valve (7) is equipped with a valve core (7-7), which is located between the first oil passage (7-2) and the second oil passage (7-5) of the emergency valve. A terminal (21) is provided in the second oil passage (7-5) of the emergency valve. The terminal (21) is connected to the controller (8) on the electro-hydraulic pump (6) through a signal line. The emergency valve (7) is also equipped with a steel ball (22), which is connected to a compression spring. (6) The outer end of the controller (8) is covered with a controller cover (9) by fastening bolts. The emergency valve (7) is equipped with a signal sensor (15). The signal line (14) connects the signal sensor (15) of the emergency valve (7) to the controller (8) of the electro-hydraulic pump (6). A threaded hole (19) is provided on the controller cover (9) at the position where the controller (8) connects to the signal line (14). The waterproof plug body (10) is a hollow cylinder. A thread is provided on the outer cylindrical surface of the inner end of the waterproof plug body (10). The thread is threaded to the threaded hole (19) on the controller cover (9). A shoulder is provided at the tail end of the thread on the inner end of the waterproof plug body (10). The left side of the shoulder The end face presses against the outer end face of the controller cover (9). A waterproof rubber ring (11) is provided at the corner of the inner end thread one and the shoulder. The waterproof rubber ring (11) is located between the shoulder of the waterproof plug body (10) and the controller cover (9). The outer end of the waterproof plug body (10) is provided with a hollow cylinder. The inner diameter of the hollow cylinder at the outer end is larger than the inner diameter of the hollow cylinder at the inner end. A T-shaped waterproof plug seal (13) is tightly inserted between the inner wall of the hollow cylinder at the outer end and the outer wall of the signal line (14). A second thread is provided on the outer cylindrical surface of the outer cylinder. The waterproof plug cap (12) is provided with a second threaded hole (20). The second threaded hole (20) and the second thread are connected by a threaded fastening.The thick, T-shaped portion of the waterproof sealing body (13) is located inside the waterproof plug cap (12). The signal line (14), after exiting the signal sensor (15), passes tightly and sequentially through the waterproof plug cap (12), the waterproof sealing body (13), and the waterproof plug body (10) from the outside in, before connecting to the controller (8).

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