Multifunctional eha external field maintenance device

Abstract

The utility model discloses a kind of multifunctional EHA field maintenance equipment, including movable case, the inside of movable case is provided with oil tank to be filled and vacuum barrel, the inside of oil tank to be filled is provided with heating temperature increasing module, temperature sensor for detecting internal oil temperature is arranged on the oil tank to be filled, and liquid level sensor for detecting internal oil level is also arranged on the oil tank to be filled, and negative pressure sensor for detecting the pressure of its inside is arranged on the oil tank to be filled, gear oil pump for pumping oil in its inside is arranged in the inside of the oil tank to be filled, the outlet of gear oil pump is connected with the inlet of one-way valve by conduit, the outlet of one-way valve is connected with the inlet of high-pressure filter, direct overflow valve is connected by conduit at the inlet of high-pressure filter, solve the problem that the oil filling exhaust equipment is bulky in prior art, functional module is dispersed, cannot adapt to field or narrow space operation and portable equipment is lower in EHA vacuum pumping and oil supplement efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of EHA field maintenance equipment, specifically a multifunctional EHA field maintenance equipment. Background Technology

[0002] Electro-hydraulic actuators (EHAs) are compact units that integrate highly integrated servo motors, bidirectional plunger pump control valve groups, actuators, sensors, and other precision components. Their structure dictates a closed oil circuit with a small internal cavity and complex flow channels, making it prone to gas retention in the pump chamber, valve ports, and dead zones. Furthermore, their components are highly sensitive to air bubbles; bubbles can increase compressibility, leading to sluggish system response and control instability. Retained gas can also cause cavitation in the plunger pump. Therefore, after factory assembly, maintenance, or before restarting after a long period of inactivity, it is essential to thoroughly purge air from the system and accurately supply the required oil level. This is particularly crucial for field maintenance, where high demands are placed on the EHA's mobility, operability, and efficiency. Currently, there is no technology that can simultaneously achieve high integration, easy mobility, and high efficiency. This invention proposes a highly integrated, easily movable, and highly efficient EHA field maintenance oil removal, venting, and filling trolley. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a multifunctional EHA field maintenance device. This device solves the problems of existing oil-filled exhaust devices being bulky, having scattered functional modules, being unable to adapt to field or confined space operations, and having low efficiency in vacuuming and oil replenishment of EHAs for portable devices. It can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A multifunctional EHA field maintenance equipment includes a movable chassis. Inside the movable chassis are an oil tank to be filled and a vacuum tank. The oil tank to be filled contains a heating module. The oil tank is equipped with a temperature sensor for detecting the internal oil temperature, a level sensor for detecting the internal oil level, and a negative pressure sensor for detecting the internal pressure. Inside the oil tank is a gear oil pump for pumping oil. The outlet of the gear oil pump is connected to the inlet of a one-way valve via a conduit. The outlet of the one-way valve is connected to the inlet of a high-pressure filter. The inlet of the high-pressure filter is connected to a direct-acting overflow valve via a conduit. The outlet of the direct-acting overflow valve is connected to the oil tank to be filled via a conduit. The internal structure of the oil tank is interconnected. The outlet of the high-pressure filter is connected to three parallel EHA oil filling directional valves via a four-way conduit. The outlets of the three EHA oil filling directional valves are respectively connected to three manual ball valves. The other end of each manual ball valve is connected to a quick-connect coupling. The three manual ball valves are respectively connected to the inlets of three vacuum directional valves. The outlets of the three vacuum directional valves are connected to the first end of a three-way ball valve via a four-way conduit. The second end of the three-way ball valve is connected to the inside of the vacuum tank via a conduit. The third end of the three-way ball valve is connected to the bottom of the oil tank to be filled via a conduit. A vacuum pump for evacuating the inside of the vacuum tank is connected to the vacuum tank. The vacuum pump is installed on the top surface of the inside of the movable chassis. A vent pipe connecting the upper end of the vacuum tank and the upper end of the oil tank to be filled is provided to connect their interiors. A plate-type two-way ball valve is installed on this vent pipe.

[0005] Furthermore, an oil drain port is provided on one side of the oil tank to be filled, and an oil drain ball valve is provided on the oil drain port. A vent is provided on one side of the upper surface of the oil tank to be filled, and a plate-type two-way ball valve is provided on the vent.

[0006] Furthermore, a waste liquid discharge port is provided at the lower side of the vacuum tank, and an oil drain ball valve is provided on the waste liquid discharge port. A liquid level sensor for detecting the oil level inside the vacuum tank is also provided on the vacuum tank, and a negative pressure sensor for detecting the internal pressure is also provided on the vacuum tank.

[0007] Furthermore, a pressure sensor is installed at the outlet of the high-pressure filter, and the outlet of the high-pressure filter is also connected to a proportional relief valve through a conduit. The outlet of the proportional relief valve is connected to the inside of the oil tank to be filled through a conduit.

[0008] Furthermore, the oil tank to be filled is equipped with a stirrer to agitate the internal oil.

[0009] Compared with the prior art, the beneficial effects of this utility model are: the movable chassis makes the device easy to move and operate; the integrated installation of hydraulic components, oil supply pump group, and stirring motor group inside the oil tank; and the top-mounted vacuum pump greatly reduces the required space and improves the performance. This multi-functional EHA field maintenance equipment has a simple structure, is easy to operate, and has a high space utilization rate. It solves the problems of existing oil filling and degassing equipment being bulky, having scattered functional modules, being unable to adapt to field or confined space operations, and having low efficiency in vacuuming and oil replenishment for EHA in portable equipment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the working process structure of this utility model; Figure 3 This is a schematic diagram of the flow chart structure of the pressure regulating valve block of this utility model; Figure 4 This is a schematic diagram of the column valve block of this utility model. Figure 5 This is a schematic diagram of the flow direction structure in the second step of this utility model; Figure 6 This is a schematic diagram of the flow direction structure in the third step of this utility model; Figure 7 This is a schematic diagram of the flow direction structure in the fourth step of this utility model; Figure 8 This is a schematic diagram of the flow direction structure in the fifth step of this utility model.

[0011] In the diagram: 1 Heating module, 2 Oil tank to be filled, 31 Drain ball valve 1, 32 Drain ball valve 2, 4 Movable chassis, 5 Quick-connect coupling, 6 Manual ball valve, 7 Agitator, 8 Gear oil pump, 9 EHA oil filling directional valve, 10 Vacuum directional valve, 11 Vacuum tank, 12 Liquid level sensor, 13 Temperature sensor, 141 Negative pressure sensor, 142 Negative pressure sensor 2, 151 Plate-type two-way ball valve 1, 152 Plate-type two-way ball valve 2, 16 Check valve, 17 Pressure sensor, 18 High-pressure filter, 19 Direct-acting relief valve, 20 Proportional relief valve, 21 Three-way ball valve, 22 Vacuum pump, 23 Liquid level sensor 2. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see Figure 1-8This utility model provides a technical solution: a multifunctional EHA field maintenance device, including a movable chassis 4. Inside the movable chassis 4 are an oil tank 2 to be filled and a vacuum tank 11. The oil tank 2 is equipped with a heating module 1, a temperature sensor 13 for detecting the internal oil temperature, a level sensor 12 for detecting the internal oil level, and a negative pressure sensor 141 for detecting the internal pressure. Inside the oil tank 2 is a gear oil pump 8 for pumping oil from the tank. The outlet of the gear oil pump 8 is connected to the inlet of a one-way valve 16 via a conduit. The outlet of the one-way valve 16 is connected to the inlet of a high-pressure filter 18. The inlet of the high-pressure filter 18 is connected to a direct-acting overflow valve 19 via a conduit. The outlet of the direct-acting overflow valve 19 is connected to the interior of the oil tank 2 to be filled via a conduit. The outlet of the high-pressure filter 18 is connected to three parallel EHA oil filling directional valves 9 via a four-way conduit. The outlets of the three EHA oil filling directional valves 9 are respectively connected to three manual ball valves 6. The other end of each manual ball valve 6 is connected to a quick-connect coupling 5. The three manual ball valves 6 are respectively connected to the inlets of three vacuum directional valves 10. The outlets of the three vacuum directional valves 10 are connected to the first end of a three-way ball valve 21 via a four-way conduit. The second end of the three-way ball valve 21 is connected to the interior of the vacuum tank 11 via a conduit. The third end of the three-way ball valve 21 is connected to the oil tank 2 to be filled via a conduit. The bottom of the oil tank 2 is open to the air. A vacuum pump 22 is connected to the vacuum tank 11 to evacuate its interior. The vacuum pump 22 is installed on the top surface of the movable housing 4. A vent pipe is provided between the upper end of the vacuum tank 11 and the upper end of the oil tank 2 to be filled, connecting their interiors. A plate-type two-way ball valve 152 is installed on the vent pipe. An oil drain port is provided on one side of the oil tank 2 to be filled, and an oil drain ball valve 31 is installed on the drain port. A vent is provided on one side of the upper surface of the oil tank 2 to be filled, and a plate-type two-way ball valve 151 is installed on the vent. A waste liquid drain port is provided at the lower side of the vacuum tank 11, and an oil drain ball valve 32 is installed on the waste liquid drain port. A liquid level sensor 23 is installed on the vacuum tank 11 to detect the oil level inside. Furthermore, the vacuum tank 11 is equipped with a negative pressure sensor 142 to detect the internal pressure. A pressure sensor 17 is installed at the outlet of the high-pressure filter 18, and the outlet of the high-pressure filter 18 is connected to a proportional relief valve 20 via a conduit. The outlet of the proportional relief valve 20 is connected to the inside of the oil tank 2 to be filled via a conduit. The oil tank 2 is equipped with a stirrer 7 to agitate the internal oil. The movable housing 4 facilitates easy movement and operation of the device. The integrated installation of hydraulic components, oil supply pump group, and stirring motor group inside the oil tank, along with the top-mounted vacuum pump 11, greatly reduces the required space and improves performance. This multi-functional EHA field maintenance equipment has a simple structure, is easy to operate, and has high space utilization.This invention addresses the problems of existing oil-filled exhaust equipment being bulky, having scattered functional modules, being unsuitable for field or confined space operations, and having low efficiency in EHA vacuuming and oil replenishment for portable equipment. When in use: First, check the oil level inside the oil tank 2 and vacuum tank 11 by using liquid level sensor 12 and liquid level sensor 23 respectively. When the oil level in the oil tank 2 is lower than the minimum value, add oil to replenish it. When the oil level inside the vacuum tank 11 is higher than the maximum value, open the drain ball valve 32 to drain the waste liquid inside the vacuum tank 11. Step 2: Vacuum the oil tank 2 to be filled. Open the plate two-way ball valve 152 to connect the oil tank 2 to be filled and the vacuum tank 11. Close the plate two-way ball valve 151. Adjust the three-way ball valve 21 to close the end connected to the vacuum tank 11. Then, use the vacuum pump 22 to evacuate the oil tank 2 to be filled and the vacuum tank 11 to a vacuum. When evacuating, use the heating module 1 to heat the inside of the oil tank 2 to be filled. At the same time, use the stirrer 7 to accelerate the discharge of gas in the hydraulic oil. Step 3: Connect the three quick-connect couplings to the EHA to be filled with oil and degassed, manually open the three manual ball valves 6, then open the plate two-way ball valve 151 and close the plate two-way ball valve 152. Adjust the three-way ball valve 21 to close the end connected to the oil tank 2 to be filled with oil. Turn on the three vacuum reversing valves 10 to open them. The EHA to be filled with oil and degassed is connected to the vacuum tank 11. Start the vacuum pump 10. The gas and residual oil inside the EHA to be filled with oil and degassed enter the vacuum tank 11. The gas is extracted by the vacuum pump 10 and the waste liquid remains inside the vacuum tank 11. When the set vacuum degree is reached, the vacuum pump 10 stops working. This completes the oil removal and degassed work. Step 4: Based on Step 3, adjust the three-way ball valve 21 to close the end connected to the vacuum tank 11, thereby connecting the oil tank 2 to be filled with oil and the EHA system to be filled with oil and degassed. The oil inside the oil tank 2 enters the EHA system to be filled with oil and degassed under atmospheric pressure. The residual gas in the EHA system to be filled with oil and degassed is incorporated into the hydraulic oil. Turn the three-way ball valve 21 again to close the end connected to the oil tank 2 to be filled with oil, so that the EHA system to be filled with oil and degassed is connected to the vacuum tank 11. The hydraulic oil with dissolved gas enters the vacuum tank 11, thereby completing the degassed process. Step 5: Adjust the three-way ball valve 21 to close the end connected to the vacuum tank 11, connect the oil tank 2 to be filled with oil and the EHA to be filled with oil and degassed, and the oil inside the oil tank 2 enters the EHA system to be filled with oil and degassed under atmospheric pressure until the pressure in the EHA system to be filled with oil and degassed reaches 1 atmosphere to complete the initial oil filling work. Step 6: Close the plate-type two-way ball valve 152, open the plate-type two-way ball valve 151, adjust the three-way ball valve 21 to close the end connected to the vacuum tank 11, adjust the pressure of the proportional overflow valve 20 to the required filling pressure, then open the corresponding EHA oil filling reversing valve 9, start the gear oil pump 8 to work until the set filling pressure is reached, thus completing the oil filling work.

[0014] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A multifunctional EHA field maintenance device, comprising a movable chassis (4), characterized in that: The movable chassis (4) is equipped with an oil tank (2) to be filled and a vacuum tank (11). The oil tank (2) to be filled is equipped with a heating module (1). The oil tank (2) to be filled is equipped with a temperature sensor (13) for detecting the internal oil temperature, a liquid level sensor (12) for detecting the internal oil level, and a negative pressure sensor (141) for detecting the internal pressure. The oil tank (2) to be filled is equipped with a gear oil pump (8) for pumping oil into the tank. The outlet of the gear oil pump (8) is connected to the inlet of a check valve (16) through a conduit. The outlet of the check valve (16) is connected to the inlet of a high-pressure filter (18). The inlet of the high-pressure filter (18) is connected to a direct-acting overflow valve (19) through a conduit. The outlet of the direct-acting overflow valve (19) is connected to the inside of the oil tank (2) to be filled through a conduit. The outlet of the high-pressure filter (18) is connected to the inside of the oil tank (2) to be filled through a four-way valve. The conduit is connected to three parallel EHA oil injection directional valves (9). The outlets of the three EHA oil injection directional valves (9) are respectively connected to three manual ball valves (6). The other ends of the manual ball valves (6) are respectively connected to quick-connect couplings (5). The three manual ball valves (6) are respectively connected to the inlets of three vacuum directional valves (10). The outlets of the three vacuum directional valves (10) are connected to the first end of a three-way ball valve (21) through a four-way conduit. The second end of the three-way ball valve (21) is connected to the first end of a three-way ball valve (21) through a four-way conduit. The pipe is connected to the inside of the vacuum tank (11), and the third end of the three-way ball valve (21) is connected to the bottom of the oil tank (2) to be filled through the conduit. The vacuum tank (11) is connected to a vacuum pump (22) to evacuate its interior. The vacuum pump (22) is installed on the top surface of the inside of the movable housing (4). A vent pipe is provided between the upper end of the vacuum tank (11) and the upper end of the oil tank (2) to be filled, and a plate-type two-way ball valve (152) is installed on the vent pipe.

2. The multifunctional EHA field maintenance equipment according to claim 1, characterized in that: The oil tank (2) to be filled has an oil drain port on one side, and an oil drain ball valve (31) is provided on the oil drain port. The upper surface of the oil tank (2) to be filled has a vent on one side, and a plate-type two-way ball valve (151) is provided on the vent.

3. The multifunctional EHA field maintenance equipment according to claim 1, characterized in that: The vacuum tank (11) is provided with a waste liquid outlet at the lower side, and an oil drain ball valve (32) is provided on the waste liquid outlet. The vacuum tank (11) is also provided with a liquid level sensor (23) for detecting the oil level inside, and a negative pressure sensor (142) for detecting the pressure inside is also provided on the vacuum tank (11).

4. The multifunctional EHA field maintenance equipment according to claim 1, characterized in that: A pressure sensor (17) is provided at the outlet of the high-pressure filter (18), and a proportional relief valve (20) is also connected to the outlet of the high-pressure filter (18) through a conduit. The outlet of the proportional relief valve (20) is connected to the inside of the oil tank (2) to be filled through a conduit.

5. The multifunctional EHA field maintenance equipment according to claim 1, characterized in that: The oil tank (2) to be filled is equipped with a stirrer (7) to agitate the oil inside.

Images