A hydraulic system with both chassis decoupling and heat dissipation and a sewage suction truck

Abstract

The present invention discloses a hydraulic system and a sewage suction truck with both chassis decoupling and heat dissipation, comprising: a hydraulic oil pipeline module installed on the sewage suction truck, the hydraulic oil pipeline module includes an oil tank, a supply pipeline and a return pipeline, and one ends of the supply pipeline and the return pipeline are both connected to the oil tank; a power pump and an oil circuit adjustment module are included, the oil circuit adjustment module includes a proportional flow control valve, one end of the power pump is connected to the oil tank through the supply pipeline, and the other end is connected to each action actuator through the proportional flow control valve; a heat dissipation module is included, one end of the heat dissipation module is connected to the oil tank through the return pipeline, and the other end is connected to the oil circuit adjustment module through the return pipeline. The advantages of the present invention compared with the prior art are as follows: the hydraulic system is decoupled from the chassis, and has an independent heat dissipation function, reducing the use of the pump source and reducing the heat generation of the hydraulic system.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage suction trucks, and in particular to a hydraulic system with both chassis decoupling and heat dissipation and a sewage suction truck having the same. Background Art

[0002] In addition to the fan suction system, the action execution mechanism control system of the sewage suction truck hydraulic system mainly includes boom movement control, tank lifting, and opening and closing of the tank rear door. In addition, for continuous operation of the vehicle, the hydraulic system is also equipped with a hydraulic oil cooling system. The attitude adjustment of the suction boom mainly includes telescoping, luffing, and slewing. During the suction operation, the user needs to adjust the boom attitude in real time to adjust the position of the suction pipe and the liquid level. According to the operation performance of the sewage suction truck, when realizing different suction distances and suction depths, the user needs to adjust the engine speed to meet the different suction capabilities of the vehicle.

[0003] The hydraulic system of the action execution mechanism of the industry sewage suction truck mainly uses a fixed displacement pump to match a switch valve. The flow rate of the hydraulic system changes with the change of the engine speed adjusted by the user, resulting in different speeds of the action execution mechanism at different engine speeds. At present, there are two control methods for the operation speed of the action execution mechanism in the industry. One is to design the operation speed of each action execution mechanism to be the appropriate operation speed at idle speed, and it is mandatory that each action execution mechanism can only act at idle speed; the other is to design the operation speed of each action execution mechanism to be the appropriate operation speed at the highest vehicle operation speed. The disadvantage of the first method is that when the engine operates at a low speed, the boom movement speed is too slow and the user experience is poor. When the boom moves at a high engine speed, it causes power waste. The disadvantage of the second method is that when the engine is at a high speed, the boom and suction cannot act simultaneously. The user needs to reduce the engine speed to idle speed to adjust the boom, and then increase the engine speed to perform the suction operation, which is cumbersome to operate.

[0004] At the same time, for the hydraulic system with the control mode of the fixed displacement pump matching the switch valve of the sewage suction truck, the speed control of each action execution mechanism adopts throttle speed regulation, resulting in system heating and power waste.

[0005] In addition, the hydraulic oil cooling system of the industry sewage suction truck mostly uses an independent oil supply system, resulting in more pump sources for the whole vehicle, high manufacturing cost, and the output of the pump source not being fully and effectively utilized. Summary of the Invention

[0006] The present invention aims to solve the technical problems mentioned in the above background art, and provides a hydraulic system with both chassis decoupling and heat dissipation functions, and a sewage suction truck with better controllability at the same time.

[0007] To solve the above technical problems, the technical solution provided by the present invention is: a hydraulic system with both chassis decoupling and heat dissipation, including:

[0008] Hydraulic oil pipeline module, the hydraulic oil pipeline module includes an oil tank, a supply pipeline and a return pipeline, and one ends of the supply pipeline and the return pipeline are both connected to the oil tank;

[0009] Power pump and oil circuit regulating module, one end of the power pump is connected to the oil tank through the supply pipeline, and the other end is connected to the oil circuit regulating module through the supply pipeline. The oil circuit regulating module includes a proportional flow control valve. The input end of the proportional flow control valve is connected to the output end of the power pump, and one of its output ends is connected to the oil inlets of the boom movement control circuit, the tank lifting control circuit and the tank rear door opening and closing control circuit through the supply pipeline;

[0010] Heat dissipation module, one end of the heat dissipation module is connected to the oil tank through the return pipeline, and the other end is connected to the oil circuit regulating module through the return pipeline.

[0011] Further, the hydraulic oil pipeline module further includes a heat dissipation branch, a return oil branch I, a return oil branch II and a return oil branch III. One ends of the return oil branch I, the return oil branch II and the return oil branch III are all connected to the return pipeline. One end of the return pipeline passes through the heat dissipation module and is connected to the oil tank, and the other end is connected to the oil outlets of the boom movement control circuit, the tank lifting control circuit and the tank rear door opening and closing control circuit.

[0012] Further, the oil circuit regulating module further includes a first overflow valve, a second overflow valve and a two-position three-way electromagnetic reversing valve. The two-position three-way electromagnetic reversing valve is arranged on the return oil branch I, and its input end is connected to the other output end of the proportional flow control valve. One output end of the two-position three-way electromagnetic reversing valve is connected to the return pipeline, and the other output end is connected to the heat dissipation branch. The two-position three-way electromagnetic reversing valve is used to control the opening and closing of the heat dissipation branch, and the other end of the heat dissipation branch is connected to the heat dissipation module.

[0013] Further, the first overflow valve is arranged on the return oil branch III, its input end is connected to the output end of the power pump, and its output end is connected to the return pipeline through the return oil branch III. The first overflow valve is used to limit the maximum working pressure of the supply pipeline.

[0014] Further, the second overflow valve is arranged on the return oil branch II, its input end is connected to the heat dissipation branch, and is used to control the oil circuit pressure of the heat dissipation module, and its output end is connected to the return pipeline.

[0015] Further, the heat dissipation module includes a first one-way valve, a fan hydraulic motor, a cooler and a second one-way valve. The input end of the fan hydraulic motor is connected to the heat dissipation branch, and its oil circuit pressure is limited by the second overflow valve. The output end of the fan hydraulic motor is connected to the oil tank and the input end of the first one-way valve. The output end of the first one-way valve is connected to the input end of the fan hydraulic motor to form a buffer circuit for oil pressure buffering when the fan hydraulic motor stops rotating.

[0016] Further, the input ends of the cooler and the second check valve are both connected to the oil return pipeline, and their output ends are both communicated with the fuel tank. The second check valve is used to limit the oil return pressure borne by the cooler.

[0017] Further, a sewage suction truck includes the above hydraulic system with both chassis decoupling and heat dissipation functions.

[0018] Further, the sewage suction truck further includes a fan closed hydraulic module. The fan closed hydraulic module includes a fan motor, a closed pump, and a makeup oil pump. The closed pump provides power for the fan motor, and the makeup oil pump compensates for internal leakage and cools the fan closed hydraulic module.

[0019] The advantages of the present invention compared with the prior art are as follows: 1. The operating speed of the sewage suction truck boom is not affected by the user's adjustment of the engine speed, and is completely decoupled from the chassis. During the suction operation, the user can directly operate the boom at any time, simplifying the user operation and accelerating the operation efficiency; 2. The operating speeds of each actuator are controlled by a proportional flow control valve to unload the excess flow through the pressure compensation function of the first relief valve, avoiding system heating caused by throttling losses; 3. A heat dissipation module with an integrated heat dissipation function is provided, and the actuator control system and the hydraulic oil cooling system share a pump, reducing the number of hydraulic pumps and simplifying the system layout. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the hydraulic system with both chassis decoupling and heat dissipation functions according to the embodiment of the present invention.

[0021] In the drawings: 1. Fan closed hydraulic module; 11. Fan motor; 12. Closed pump; 13. Makeup oil pump;

[0022] 2. Power pump;

[0023] 3. Heat dissipation module; 31. First check valve; 32. Fan hydraulic motor; 33. Cooler; 34. Second check valve;

[0024] 4. Hydraulic oil pipeline module; 41. Fuel tank; 42. Oil supply pipeline; 43. Oil return pipeline; 44. Heat dissipation branch; 45. Oil return branch Ⅰ; 46. Oil return branch Ⅱ; 47. Oil return branch Ⅲ;

[0025] 5. Oil circuit regulation module; 51. Proportional flow control valve; 52. First relief valve; 53. Second relief valve; 54. Two-position three-way electromagnetic directional valve. Detailed Embodiment

[0026] The following further describes the present invention in detail with reference to the drawings.

[0027] Combined with Figure 1As shown, the closed hydraulic module 1 of the fan is used for the fan suction hydraulic system of the sewage suction truck to ensure the vacuum degree in the suction pipe.

[0028] The hydraulic oil pipeline module 4 includes an oil tank 41, a supply oil pipeline 42, a return oil pipeline 43, a heat dissipation branch 44, a return oil branch I 45, a return oil branch II 46, and a return oil branch III 47.

[0029] The heat dissipation module 3 includes a first one-way valve 31, a fan hydraulic motor 32, a cooler 33, and a second one-way valve 34. The input end of the fan hydraulic motor 32 is connected to the heat dissipation branch 44, and its output end is connected to the oil tank 41 and the input end of the first one-way valve 31. The output end of the first one-way valve 31 is connected to the input end of the fan hydraulic motor 32 to form a buffer circuit for oil pressure buffering when the fan hydraulic motor 32 stops rotating. The input ends of the cooler 33 and the second one-way valve 34 are both connected to the return oil pipeline 43, and their output ends are both communicated with the oil tank 41. The second one-way valve 34 is used to limit the return oil pressure borne by the cooler 33.

[0030] The power pump 2 is arranged on the supply oil pipeline 42 to provide oil pressure for the boom movement control circuit, the tank lifting control circuit, the tank rear door opening and closing control circuit, and the heat dissipation circuit.

[0031] The power pump 2 is connected to the oil circuit regulating module 5. The oil circuit regulating module 5 includes a proportional flow control valve 51, a first overflow valve 52, a second overflow valve 53, and a two-position three-way electromagnetic reversing valve 54. The proportional flow control valve 51 is arranged on the supply oil pipeline 42, its input end is connected to the output end of the power pump 2, one of its output ends is connected to the oil inlets of the boom movement control circuit, the tank lifting control circuit, and the tank rear door opening and closing control circuit through the supply oil pipeline 42, and its other output end is connected to the return oil branch I 45.

[0032] The two-position three-way electromagnetic reversing valve 54 is arranged on the return oil branch I 45, its input end is connected to the output end of the proportional flow control valve 51. One output end of the two-position three-way electromagnetic reversing valve 54 is connected to the return oil pipeline 43, and its other output end is connected to the heat dissipation branch 44. The two-position three-way electromagnetic reversing valve 54 is used to control the opening and closing of the heat dissipation branch 44.

[0033] The first overflow valve 52 is arranged on the return oil branch III 47, its input end is connected to the output end of the power pump 2, and its output end is connected to the return oil pipeline 43 through the return oil branch III 47. The first overflow valve 52 is used to limit the maximum working pressure of the supply oil pipeline 42.

[0034] The second overflow valve 53 is arranged on the return oil branch II 46, its input end is connected to the heat dissipation branch 44, used to control the oil circuit pressure of the fan hydraulic motor 32, and its output end is connected to the return oil pipeline 43.

[0035] In the specific implementation of the present invention:

[0036] As Figure 1 shown, in the embodiment of the present invention, the power pump 2 is a gear pump, which provides for the oil supply pipeline 42. The heat dissipation module 3 is of the air-cooled heat dissipation type. During the suction operation of the sewage suction truck, the heat dissipation module 3 continuously cools the hydraulic oil. The boom movement control circuit only operates when it is necessary to adjust the position of the suction pipe and the liquid level. The lifting of the tank body and the opening and closing of the rear door only operate during unloading, and the operation frequency is relatively low. To make full and effective use of the pump source, the hydraulic circuit is reasonably designed to realize that the gear pump supplies oil to the boom, the tank body, the rear door and the fan hydraulic motor 32 uniformly, reducing the number of hydraulic pumps.

[0037] The hydraulic oil enters the oil circuit adjustment module 5 under the drive of the gear pump. The first overflow valve 52 limits the maximum working pressure of the oil supply pipeline 42 of the gear pump;

[0038] The proportional flow control valve 51 has a pressure compensation function. The A port is the input end, and oil enters through the oil supply pipeline 42. The B port is an output end, which is connected to the oil supply pipeline 42 to supply oil to the boom movement control circuit, the tank body lifting control circuit, and the tank body rear door opening and closing control circuit. The T port is the other output end, which is connected to the oil return branch I 45 to supply oil to the fan hydraulic motor 32 or return to the oil tank 41. By outputting different PWM values to the proportional flow control valve 51, the B port corresponds to different flow rates, and the excess flow passes through the T port to the oil return branch I 45 or the oil tank 41; the proportional flow control valve 51 has a pressure compensation and flow priority function for the B port oil supply pipeline 42, and matches a reasonable movement speed for the boom movement;

[0039] At the same time, the flow rate of the boom movement circuit is limited to ensure that when the user increases the engine speed, the flow rate of the boom movement circuit remains unchanged, that is, when adjusting the boom attitude during the suction operation, the boom operation speed is basically constant at different engine speeds, simplifying the user operation. At the same time, due to the pressure compensation and flow priority functions of the proportional flow control valve 51 for the B port oil supply pipeline 42, the boom movement is not affected by load changes or the start and stop of the fan motor;

[0040] For the B outlet oil supply pipeline 42 of the proportional flow control valve 51, when different action execution mechanisms perform actions, different PWM values are output to the proportional flow control valve 51, the B port corresponds to different flow rates, and the excess flow passes through the T port and the two-way three-position electromagnetic reversing valve 54 to the oil return branch I 45 or the oil tank 41. By reasonably matching the action speeds of each action through the proportional flow control valve 51, there is no throttling loss and the system heat generation is reduced.

[0041] The two-way three-position electromagnetic reversing valve is arranged on the oil return branch I 45, and its two output ends are respectively connected to the heat dissipation branch 44 and the oil return pipeline 43. The two-way three-position electromagnetic reversing valve controls the start and stop of the fan hydraulic motor 32.

[0042] The second overflow valve 53 is provided on the oil return branch II 46. The two ends of the oil return branch II 46 are respectively connected to the heat dissipation branch 44 and the oil return pipeline 43. The second overflow valve 53 is used to limit the maximum working pressure on the fan hydraulic motor 32 circuit to prevent the fan hydraulic motor 32 from overspeed.

[0043] When only the actuator on the B oil supply pipeline 42 of the proportional flow control valve 51 has an action, the two-position three-way electromagnetic reversing valve 54 is de-energized, and the excess flow returns to the fuel tank 41 through the two-position three-way electromagnetic reversing valve 54 and the oil return branch I 45;

[0044] When only the fan hydraulic motor 32 is operating, the two-position three-way electromagnetic reversing valve 54 is energized. All the oil output from the gear pump 2 passes through the T port of the proportional flow control valve 51 and the two-position three-way electromagnetic reversing valve 54 to reach the heat dissipation branch 44 where the fan hydraulic motor 32 is located. The second overflow valve 53 is provided on the oil return branch II 46 to limit the maximum working pressure of the fan hydraulic motor 32. When the user needs to adjust the engine speed to be relatively high, the excess flow overflows through the second overflow valve 53 to prevent the fan hydraulic motor 32 from overspeed.

[0045] When the actuator on the B oil supply pipeline 42 of the proportional flow control valve 51 and the fan hydraulic motor 32 have actions simultaneously, the two-position three-way electromagnetic reversing valve 54 is energized. The proportional flow control valve 51 preferentially ensures the flow of the pressure-compensated B oil supply pipeline 42 to ensure the constant action speed of each actuator. The excess flow reaches the fan hydraulic motor 32 circuit through the two-position three-way electromagnetic reversing valve 54.

[0046] In the description of the present invention, unless otherwise clearly specified and defined, terms such as "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic system with both chassis decoupling and heat dissipation, characterized in that Comprising: A hydraulic oil pipeline module (4), the hydraulic oil pipeline module (4) includes an oil tank (41), a fuel supply pipeline (42) and a return oil pipeline (43), one ends of the fuel supply pipeline (42) and the return oil pipeline (43) are both connected to the oil tank (41); A power pump (2) and an oil circuit regulating module (5), one end of the power pump (2) is connected to the oil tank (41) through the fuel supply pipeline (42), and the other end is connected to the oil circuit regulating module (5) through the fuel supply pipeline (42), the oil circuit regulating module (5) includes a proportional flow control valve (51), the input end of the proportional flow control valve (51) is connected to the output end of the power pump (2), and one of its output ends is connected to the oil inlets of the boom movement control circuit, the tank lifting control circuit and the tank rear door opening and closing control circuit through the fuel supply pipeline (42); A heat dissipation module (3), one end of the heat dissipation module (3) is connected to the oil tank (41) through the return oil pipeline (43), and the other end is connected to the oil circuit regulating module (5) through the return oil pipeline (43); The hydraulic oil pipeline module (4) further includes a heat dissipation branch (44), a return oil branch I (45), a return oil branch II (46) and a return oil branch III (47), one ends of the return oil branch I (45), the return oil branch II (46) and the return oil branch III (47) are all connected to the return oil pipeline (43), one end of the return oil pipeline (43) passes through the heat dissipation module (3) and is connected to the oil tank (41), and the other end is connected to the oil outlets of the boom movement control circuit, the tank lifting control circuit and the tank rear door opening and closing control circuit; The oil circuit regulating module (5) further includes a first overflow valve (52), a second overflow valve (53) and a two-position three-way electromagnetic reversing valve (54), the two-position three-way electromagnetic reversing valve (54) is arranged on the return oil branch I (45), its input end is connected to the other output end of the proportional flow control valve (51), one output end of the two-position three-way electromagnetic reversing valve (54) is connected to the return oil pipeline (43), and its other output end is connected to the heat dissipation branch (44), the two-position three-way electromagnetic reversing valve (54) is used to control the opening and closing of the heat dissipation branch (44), and the other end of the heat dissipation branch (44) is connected to the heat dissipation module (3); The first overflow valve (52) is arranged on the return oil branch III (47), its input end is connected to the output end of the power pump (2), and its output end is connected to the return oil pipeline (43) through the return oil branch III (47), the first overflow valve (52) is used to limit the maximum working pressure of the fuel supply pipeline (42).

2. The hydraulic system with both chassis decoupling and heat dissipation according to claim 1, characterized in that: The second overflow valve (53) is arranged on the return oil branch II (46), its input end is connected to the heat dissipation branch (44), is used to control the oil circuit pressure of the heat dissipation module (3), and its output end is connected to the return oil pipeline (43).

3. A hydraulic system with both chassis decoupling and heat dissipation according to claim 1, characterized in that: The heat dissipation module (3) includes a first one-way valve (31), a fan hydraulic motor (32), a cooler (33), and a second one-way valve (34). The input end of the fan hydraulic motor (32) is connected to a heat dissipation branch (44), and its oil circuit pressure is defined by the second relief valve (53). The output end of the fan hydraulic motor (32) is connected to an oil tank (41) and the input end of the first one-way valve (31). The output end of the first one-way valve (31) is connected to the input end of the fan hydraulic motor (32) to form a buffer circuit for oil pressure buffering when the fan hydraulic motor (32) stops rotating.

4. A hydraulic system with both chassis decoupling and heat dissipation according to claim 3, characterized in that: The input ends of the cooler (33) and the second one-way valve (34) are both connected to an oil return pipeline (43), and their output ends are both communicated with the oil tank (41). The second one-way valve (34) is used to define the oil return pressure borne by the cooler (33).

5. A sewage suction truck, characterized in that: The sewage suction truck includes a hydraulic system with both chassis decoupling and heat dissipation according to any one of claims 1-4.

6. The sewage suction truck according to claim 5, wherein: It further includes a fan closed hydraulic module (1). The fan closed hydraulic module (1) includes a fan motor (11), a closed pump (12), and a makeup oil pump (13). The closed pump (12) provides power for the fan motor (11), and the makeup oil pump (13) supplements internal leakage and cooling for the fan closed hydraulic module (1).

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