Leveling hydraulic system for aerial working platform of lightweight integrated aerial ladder fire truck

Abstract

The embodiment of the invention discloses a lightweight integrated aerial ladder fire truck high-altitude working platform leveling hydraulic system which is characterized in that an additive manufacturing shell is connected with a motor through a motor interface, a gear pump gear assembly and the shell are integrated, and a motor shaft and a gear pump extending shaft are connected through a motor pump penetrating hole; the shuttle valve, the one-way valve, the electromagnetic reversing valve and the overflow valve are connected with the shell through a first shuttle valve connector / a second shuttle valve connector, a one-way valve connector, an electromagnetic reversing valve connector and an overflow valve connector respectively, and the oil tank and the shell are integrally designed and directly communicated with the ninth flow channel and the eleventh flow channel. And the tenth flow channel is connected with the pressure measuring joint to monitor the pressure of the system in real time. The additive manufacturing technology is applied to the leveling hydraulic system of the aerial ladder fire truck high-altitude working platform, light-weight treatment and element fusion design are adopted, high integration of power and control parts of a shell of the leveling hydraulic system is achieved, low-pressure-loss forming design reduces installation faces and sealing faces, and the leakage risk is reduced.

Description

Technical Field

[0001] The embodiments of the present application belong to the field of hydraulic transmission control, and in particular to a hydraulic system for leveling a high-altitude working platform of a lightweight integrated ladder fire truck. Background Art

[0002] A ladder fire truck is a special fire truck specially designed for responding to high-rise building fires and high-altitude rescue. It is equipped with a retractable ladder or mechanical arm, and the end of the ladder is also equipped with an aerial work platform. The key role of the aerial work platform is the leveling hydraulic system, which is responsible for the realization of functions such as the folding and unfolding, angle adjustment and leveling of the work platform. Ladder fire trucks play an important role in high-altitude firefighting and rescue, but the leveling hydraulic system of the ladder fire truck's working platform has the disadvantages of low adjustment efficiency, small load, heavy weight, and large volume. Therefore, the integrated and lightweight design of the leveling hydraulic system will have great research value.

[0003] Based on traditional manufacturing methods, it is difficult to achieve further integrated design and manufacturing of hydraulic systems. As the most promising forming and manufacturing technology, metal additive manufacturing technology has significant advantages in the integration and lightweight research of hydraulic systems. Summary of the invention

[0004] In view of the shortcomings of the existing technology and the problems of low adjustment efficiency, small load, heavy weight and large volume in the leveling hydraulic system of the working platform of the ladder fire truck, the present invention uses additive manufacturing technology to provide a design scheme for the leveling hydraulic system of the high-altitude working platform of a lightweight integrated ladder fire truck.

[0005] The technical solution adopted by the present invention is as follows:

[0006] The present invention provides a lightweight integrated aerial work platform leveling hydraulic system for a ladder fire truck, which is an integrally formed whole, comprising: an additively manufactured housing, a motor interface, two hydraulic cylinder interfaces, two manual module connection ports, a one-way valve interface, two shuttle valve interfaces, an electromagnetic reversing valve interface, an oil tank end cover mounting hole, an overflow valve interface, a pressure measuring joint, an oil tank, a gear pump end cover interface, a gear pump, an oil filling port, a manual part oil supply port, a motor pump through-hole and eleven flow channels; the additively manufactured housing is connected to the motor via the motor interface, the gear pump gear assembly is integrated with the additively manufactured housing, the gear pump end cover is installed through the gear pump end cover interface to achieve sealing, and the motor shaft and the gear pump protruding shaft are connected through the motor pump through-hole. The shuttle valve, the one-way valve, the solenoid reversing valve and the relief valve are connected to the housing through the first shuttle valve interface / the second shuttle valve interface, the one-way valve interface, the solenoid reversing valve interface and the relief valve interface respectively. The oil tank and the housing are integrated in design, and the end cover is installed through the mounting hole of the oil tank end cover to achieve sealing, and is directly connected to the ninth flow channel and the eleventh flow channel. Oil is added through the oil filling port, and oil is supplied to the manual part through the manual part oil supply port; the manual part is connected through the first manual module connection port / the second manual module connection port, and the external hydraulic cylinder is connected through the first hydraulic cylinder interface / the second hydraulic cylinder interface; it is connected to the pressure measuring joint through the tenth flow channel to monitor the system pressure in real time; the remaining parts are interconnected through the flow channels and are designed as an integrated whole with the actuator.

[0007] Furthermore, the first hydraulic cylinder interface, the first manual module connection port, the second manual module connection port, the one-way valve interface, the second hydraulic cylinder interface, and the manual part oil supply port are arranged on the same side of the shell, the cavity opening directions are consistent, and are respectively connected to the shell through the fourth flow channel, the fifth flow channel, the seventh flow channel, the second flow channel, and the eighth flow channel.

[0008] Furthermore, the first shuttle valve, the second shuttle valve, the electromagnetic reversing valve, the oil filling port, the overflow valve, and the pressure measuring joint are arranged on the same side of the shell, and the cavity opening directions are consistent, wherein the first shuttle valve is connected to the third flow channel, the fourth flow channel, and the fifth flow channel, the second shuttle valve is connected to the sixth flow channel, the seventh flow channel, and the eighth flow channel, the electromagnetic reversing valve is connected to the second flow channel, the third flow channel, the sixth flow channel, and the eleventh flow channel, the overflow valve is connected to the first flow channel and the ninth flow channel, and the pressure measuring joint is connected to the tenth flow channel.

[0009] Specifically, there is a more obvious unused space on one side of the gear pump than on the motor side, and the special-shaped oil tank wraps the unused space and extends outward to a specified volume.

[0010] Furthermore, based on the forming direction of additive manufacturing, the overhanging cavity and protruding structure of the one-way valve interface, the second hydraulic cylinder interface, the first shuttle valve interface, the solenoid reversing valve interface, the second shuttle valve interface and the overflow valve interface are designed with self-supporting structure and printing forming angle to avoid printing support.

[0011] Furthermore, the manual part is supplied with oil through the manual part oil supply port, and the system does not need an external oil source when running.

[0012] By adopting the above scheme, the effective effects of the present invention are as follows:

[0013] The present invention provides a lightweight integrated aerial work platform leveling hydraulic system for aerial ladder fire trucks. The high forming freedom of additive manufacturing is utilized to highly integrate various valve component interfaces, motor interfaces, etc., and the gear pump and oil tank are integrated with the shell in an integrated design, which greatly improves the system's integration and lightweight degree. The opening elements follow the same direction of the cavity opening under the premise of compactness, avoiding the design of tilted placement, and the openings can be kept on the same plane as much as possible, making the forming quality more stable and facilitating subsequent processing and installation. Based on the forming direction of additive manufacturing, the overhanging cavity and protruding structure are designed with a self-supporting structure and a printing forming angle, avoiding subsequent difficult-to-remove printing supports. It is of great significance to improve the lightweight integration of the aerial work platform leveling hydraulic system of the aerial ladder fire truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 It is a first isometric view of the hydraulic system for leveling the aerial work platform of the lightweight integrated ladder fire truck of the present invention;

[0016] Figure 2 It is a second isometric view of the hydraulic system for leveling the aerial work platform of the lightweight integrated ladder fire truck of the present invention;

[0017] Figure 3 It is a first isometric view of the flow passage of the hydraulic system for leveling the aerial work platform of the lightweight integrated ladder fire truck of the present invention;

[0018] Figure 4 It is a second isometric view of the flow passage of the hydraulic system for leveling the aerial work platform of the lightweight integrated ladder fire truck provided by the present invention;

[0019] Figure 5 It is a hydraulic system principle diagram of the hydraulic system for leveling the aerial work platform of the lightweight integrated ladder fire truck provided by the present invention;

[0020] In the figure, the additive manufacturing shell 1, the motor interface 2, the first hydraulic cylinder interface 3, the first manual module connection port 4, the second manual module connection port 5, the one-way valve interface 6, the second hydraulic cylinder interface 7, the first shuttle valve interface 8, the solenoid reversing valve interface 9, the second shuttle valve interface 10, the oil tank end cover mounting hole 11, the overflow valve interface 12, the pressure measuring joint 13, the oil tank 14, the gear pump end cover interface 15, the gear pump 16, the oil filling port 17, the manual part oil supply port 18, the motor pump perforation 19, the first flow channel 20, the second flow channel 21, the third flow channel 22, the fourth flow channel 23, the fifth flow channel 24, the sixth flow channel 25, the seventh flow channel 26, the eighth flow channel 27, the ninth flow channel 28, the tenth flow channel 29, and the eleventh flow channel 30. DETAILED DESCRIPTION

[0021] like Figure 1-5 As shown, an embodiment of the present invention provides a lightweight integrated ladder fire truck aerial work platform leveling hydraulic system based on additive manufacturing, including: an additive manufacturing shell 1, a motor interface 2, a first hydraulic cylinder interface 3, a first manual module connection port 4, a second manual module connection port 5, a one-way valve interface 6, a second hydraulic cylinder interface 7, a first shuttle valve interface 8, an electromagnetic reversing valve interface 9, a second shuttle valve interface 10, a tank end cover mounting hole 11, a relief valve interface 12, a pressure measuring joint 13, a tank 14, a gear pump end cover interface 15, a gear pump 16, an oil filling port 17, a manual part oil supply port 18, a motor pump perforation 19, a first flow channel 20, a second flow channel 21, a third flow channel 22, a fourth flow channel 23, a fifth flow channel 24, a sixth flow channel 25, a seventh flow channel 26, an eighth flow channel 27, a ninth flow channel 28, a tenth flow channel 29 and an eleventh flow channel 30.

[0022] When the electromagnetic reversing valve installed in the electromagnetic reversing valve interface 9 is in the middle position, the first hydraulic cylinder interface 3 is directly connected to the oil tank 14 via the fourth flow channel 23, the first shuttle valve installed in the first shuttle valve interface 8, the third flow channel 22, the electromagnetic reversing valve 9, and the eleventh flow channel 30, and the second hydraulic cylinder interface 7 is directly connected to the oil tank 14 via the eighth flow channel 27, the second shuttle valve installed in the second shuttle valve interface 10, the sixth flow channel 25, the electromagnetic reversing valve installed in the electromagnetic reversing valve interface 9, and the eleventh flow channel 30, there is no pressure inside the system and it is in a working standby state. When the electromagnetic reversing valve is in the right position, the oil is pumped out from the oil tank 14 through the gear pump 16, through the first flow channel 20, the one-way valve installed in the one-way valve interface 6, the second flow channel 21, the electromagnetic reversing valve, the sixth flow channel 25, the second shuttle valve, the eighth flow channel 27 to enter the second hydraulic cylinder interface 7, and the oil in the other chamber of the hydraulic cylinder returns to the oil tank 14 through the first hydraulic cylinder interface 3, the fourth flow channel 23, the first shuttle valve, the third flow channel 22, the electromagnetic reversing valve, and the eleventh flow channel 30. The system is in the automatic control forward adjustment state, controlling the working platform to move forward and level it. When the electromagnetic reversing valve 9 is in the left position, the oil is pumped out from the oil tank 14 through the gear pump 16, and enters the first hydraulic cylinder interface 3 through the first flow channel 20, the one-way valve, the second flow channel 21, the electromagnetic reversing valve, the third flow channel 22, the first shuttle valve, and the fourth flow channel 23. The oil in the other chamber of the hydraulic cylinder returns to the oil tank 14 through the second hydraulic cylinder interface 7, the eighth flow channel 27, the second shuttle valve, the sixth flow channel 25, the electromagnetic reversing valve, and the eleventh flow channel 30. The system is in the automatic control reverse adjustment state, controlling the reverse action and leveling of the working platform. When the hydraulic system is overloaded with high pressure, the oil is pumped out from the gear pump 16 through the first flow channel 20, the overflow valve installed in the overflow valve interface 12, and the ninth flow channel 28 to release pressure back to the oil tank 14.

[0023] The additive manufacturing shell 1 is connected to the motor via the motor interface 2, the gear pump gear assembly 16 is integrated with the shell, the gear pump end cover is installed through the gear pump end cover interface 15 to achieve sealing, the motor shaft is connected to the gear pump extension shaft through the motor pump through the motor pump through the hole 19, the shuttle valve, the one-way valve, the electromagnetic reversing valve, and the overflow valve are connected to the shell through the first shuttle valve interface 8 / the second shuttle valve interface 10, the one-way valve interface 6, the electromagnetic reversing valve interface 9, and the overflow valve interface 12, respectively. The oil tank 14 is integrated with the shell, and the end cover is installed through the oil tank end cover mounting hole 11 to achieve sealing, and is directly connected to the ninth flow channel 28 and the eleventh flow channel 30, and oil is added through the oil filling port 17, and the manual part is supplied with oil through the manual part oil supply port 18. The manual part is connected through the first manual module connection port 4 / the second manual module connection port 5, and the external hydraulic cylinder is connected through the first hydraulic cylinder interface 3 / the second hydraulic cylinder interface 7. It is connected to the pressure measuring joint 13 through the tenth flow channel 29 to monitor the system pressure in real time. The remaining parts are interconnected through flow channels and are designed as an integral unit with the actuator.

[0024] In the present embodiment of the application, the shape of the oil tank 14 has a high degree of freedom. After the other components are roughly arranged, a special-shaped oil tank can be designed to wrap the unused space and extend outward to the specified volume.

[0025] In the present embodiment of the application, the gear pump 16 is designed to be integrated with the additive manufacturing housing 1, and sealing is achieved by only installing the gear pump end cover through the gear pump end cover interface 15.

[0026] In the present embodiment of the application, the opening elements and interfaces follow the same direction of the cavity opening while being compact, avoiding tilted designs, and can keep these openings on the same plane as much as possible, making the forming quality more stable and facilitating subsequent processing and installation.

[0027] In the present embodiment of the application, the additively manufactured housing is integrally formed with part of the flow passages communicating with the oil passages of other components, thereby reducing external oil passages and right-angle turns, and reducing the risk of leakage and pressure loss.

[0028] In the present embodiment of the application, it is necessary to perform self-supporting structure design and printing forming angle design for the overhanging cavity and the protruding structure based on the forming direction of additive manufacturing, thereby avoiding subsequent difficult-to-remove printing supports.

Claims

1. A lightweight integrated ladder fire truck aerial work platform leveling hydraulic system, characterized in that: The system is an integrally formed whole, including: an additive manufacturing shell, a motor interface, two hydraulic cylinder interfaces, two manual module connection ports, a one-way valve interface, two shuttle valve interfaces, an electromagnetic reversing valve interface, an oil tank end cover mounting hole, an overflow valve interface, a pressure measuring joint, an oil tank, a gear pump end cover interface, a gear pump, an oil filling port, a manual part oil supply port, a motor pump through-hole and eleven flow channels; the additive manufacturing shell is connected to the motor via the motor interface, the gear pump gear assembly is integrated with the additive manufacturing shell, the gear pump end cover is installed through the gear pump end cover interface to achieve sealing, the motor shaft is connected to the gear pump protruding shaft through the motor pump through-hole, the shuttle valve, the one-way valve, the electromagnetic reversing valve, The overflow valve is connected to the housing through the first shuttle valve interface / the second shuttle valve interface, the one-way valve interface, the electromagnetic reversing valve interface and the overflow valve interface respectively. The oil tank and the housing are integrated in design. The end cover is installed through the oil tank end cover mounting hole to achieve sealing, and is directly connected to the ninth flow channel and the eleventh flow channel. Oil is added through the oil filling port, and oil is supplied to the manual part through the manual part oil supply port; the manual part is connected through the first manual module connection port / the second manual module connection port, and the external hydraulic cylinder is connected through the first hydraulic cylinder interface / the second hydraulic cylinder interface; it is connected to the pressure measuring joint through the tenth flow channel to monitor the system pressure in real time; the remaining parts are interconnected through the flow channels and are designed as an integrated whole with the actuator.

2. According to claim 1, a lightweight integrated ladder fire truck aerial work platform leveling hydraulic system is characterized in that: The first hydraulic cylinder interface, the first manual module connection port, the second manual module connection port, the one-way valve interface, the second hydraulic cylinder interface, and the manual part oil supply port are arranged on the same side of the shell, the cavity opening directions are consistent, and are connected to the shell through the fourth flow channel, the fifth flow channel, the seventh flow channel, the second flow channel, and the eighth flow channel, respectively.

3. The hydraulic system for leveling the aerial work platform of a lightweight integrated ladder fire truck according to claim 1 is characterized in that: The first shuttle valve, the second shuttle valve, the electromagnetic reversing valve, the oil filling port, the overflow valve, and the pressure measuring joint are arranged on the same side of the shell, and the cavity opening directions are consistent. The first shuttle valve is connected to the third flow channel, the fourth flow channel, and the fifth flow channel, the second shuttle valve is connected to the sixth flow channel, the seventh flow channel, and the eighth flow channel, the electromagnetic reversing valve is connected to the second flow channel, the third flow channel, the sixth flow channel, and the eleventh flow channel, the overflow valve is connected to the first flow channel and the ninth flow channel, and the pressure measuring joint is connected to the tenth flow channel.

4. The hydraulic system for leveling the aerial work platform of a lightweight integrated ladder fire truck according to claim 1 is characterized in that: The gear pump side has a more obvious unused space than the motor side, and the special-shaped oil tank wraps the unused space and extends outward to a specified volume.

5. The hydraulic system for leveling the aerial work platform of a lightweight integrated ladder fire truck according to claim 1 is characterized in that: Based on the forming direction of additive manufacturing, the overhanging cavity and protruding structure of the one-way valve interface, the second hydraulic cylinder interface, the first shuttle valve interface, the solenoid reversing valve interface, the second shuttle valve interface and the overflow valve interface are designed with self-supporting structure and printing forming angle to avoid printing support.

6. According to the lightweight integrated ladder fire truck aerial work platform leveling hydraulic system according to claim 1, it is characterized in that: The manual part is supplied with oil through the manual part oil supply port, and the system does not require an external oil source when running.

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