阅读说明：本技术 一种静液压行走驱动循环冲洗控制系统 (Hydrostatic walking drive circulation flushing control system ) 是由 李福生 邵可 李利民 于 2021-07-02 设计创作，主要内容包括：本发明提供一种静液压行走驱动循环冲洗控制系统,包括油箱、泵组件、马达组件、循环冲洗组件、以及连接泵组件和马达组件的第一驱动管道和第二驱动管道,循环冲洗组件包括与第一驱动管道相连的第一冲洗管道、与第二驱动管道相连的第二冲洗管道、梭阀、设置在第一冲洗管道和第二冲洗管道上的截止阀、换向阀、以及与泵组件相连的第三冲洗管道,梭阀的两端分别与第一冲洗管道和第二冲洗管道相连,第一冲洗管道、第二冲洗管道和第三冲洗管道通过换向阀相连。本申请通过控制梭阀和截止阀实现循环冲洗组件整体的开启与关闭,由此实现循环冲洗与行走驱动作业的分离,既能避免溢流发热,又能避免管路残存的部分磨屑会继续对后续管路造成质量隐患。(The invention provides a hydrostatic traveling drive circulating flushing control system which comprises an oil tank, a pump assembly, a motor assembly, a circulating flushing assembly, a first driving pipeline and a second driving pipeline, wherein the first driving pipeline and the second driving pipeline are used for connecting the pump assembly and the motor assembly, the circulating flushing assembly comprises a first flushing pipeline connected with the first driving pipeline, a second flushing pipeline connected with the second driving pipeline, a shuttle valve, a stop valve, a reversing valve and a third flushing pipeline, the stop valve and the reversing valve are arranged on the first flushing pipeline and the second flushing pipeline, the third flushing pipeline is connected with the pump assembly, two ends of the shuttle valve are respectively connected with the first flushing pipeline and the second flushing pipeline, and the first flushing pipeline, the second flushing pipeline and the third flushing pipeline are connected through the reversing valve. This application realizes through control shuttle valve and stop valve that the circulation washes the holistic opening of subassembly and close, realizes from this that the circulation washes and the separation of travel drive operation, can avoid the overflow to generate heat, can avoid the remaining partial abrasive dust of pipeline again to continue to lead to the fact the quality hidden danger to follow-up pipeline.)

1. The utility model provides a quiet hydraulic pressure walking drive circulation flushing control system, includes the oil tank, with the oil tank pump assembly (10) link to each other, and by pump assembly (10) drive motor subassembly (20) of operation, pump assembly (10) have first pump business turn over hydraulic fluid port (11), and second pump business turn over hydraulic fluid port (12), motor subassembly (20) have first motor business turn over hydraulic fluid port (21), and second motor business turn over hydraulic fluid port (22), first pump business turn over hydraulic fluid port (11) link to each other with first motor business turn over hydraulic fluid port (21) through first drive tube (30), second pump business turn over hydraulic fluid port (12) link to each other with second motor business turn over hydraulic fluid port (22) through second drive tube (40), its characterized in that: the circulating flushing device is characterized by further comprising a circulating flushing assembly (50), wherein the circulating flushing assembly (50) comprises a first flushing pipeline (51) connected with the first driving pipeline (30), a second flushing pipeline (52) connected with the second driving pipeline (40), a shuttle valve (53), a stop valve (57) arranged on the first flushing pipeline (51) and the second flushing pipeline (52), a reversing valve (55) and a third flushing pipeline (56) connected with the pump assembly (10), two ends of the shuttle valve (53) are respectively connected with the first flushing pipeline (51) and the second flushing pipeline (52), the first flushing pipeline (51), the second flushing pipeline (52) and the third flushing pipeline (56) are connected through the reversing valve (55), and the stop valve (57) is located between the shuttle valve (53) and the reversing valve (55).

2. The hydrostatic travel drive circulation flush control system of claim 1, wherein: the circulating flushing assembly (50) further comprises a pressure sensor (54), and the pressure sensor (54) is connected with the shuttle valve (53).

3. The hydrostatic travel drive circulation flush control system of claim 1, wherein: and throttle valves (58) are arranged on the first flushing pipeline (51) and the second flushing pipeline (52).

4. The hydrostatic travel drive circulation flush control system of claim 1, wherein: the reversing valve (55) is a three-position four-way reversing valve.

5. The hydrostatic travel drive circulation flush control system of claim 1, wherein: a check valve (59) is provided on the third flushing line (56), the check valve (59) allowing oil to flow from the reversing valve (55) to the pump assembly (10).

6. The hydrostatic travel drive circulation flush control system of claim 1, wherein: a filter (510) is arranged on the third flushing pipeline (56).

7. The hydrostatic travel drive circulation flush control system of claim 1, wherein: pump assembly (10) include trunk line (13) that link to each other with the oil tank, all set up variable pump (14) and oil supplementing pump (15) on trunk line (13), servo valve (16) and overflow valve (17) that link to each other with variable pump (14), first pump business turn over hydraulic fluid port (11) and second pump business turn over hydraulic fluid port (12) all communicate with variable pump (14), first pump business turn over hydraulic fluid port (11) and second pump business turn over hydraulic fluid port (12) still all communicate with oil supplementing pump (15), overflow valve (17) and oil supplementing pump (15) all link to each other with third flushing line (56).

Technical Field

The invention relates to the technical field of engineering hydraulic pressure, in particular to a hydrostatic walking drive circulating flushing control system.

Background

In a heavy transport vehicle driven by multi-axle hydrostatic traveling, a molten iron transport vehicle comprising a special metallurgical vehicle generally adopts a transmission scheme that a pump drives a plurality of motors. In consideration of heat dissipation and pollution discharge, a special flushing valve is arranged in the design of a common closed system, and partial heat is taken away through overflow of the low-pressure oil return side part of the motor end, and meanwhile, the updating of the internal oil is accelerated. However, the overflow heat generated by the system is not negligible due to the defects of increasing the discharge capacity of the oil replenishing pump and the like, the air suction risk is easy to occur in a high-speed large-inertia system, and the system is actually used as a closed system, and can generally meet the heat dissipation requirement of the system through high efficiency, oil replenishing and reasonable pressure matching. Thus, considering only the heat sink function of a closed system does not necessarily require the provision of a dedicated flush valve. However, the pollution discharge and cleaning capability of the system can be weakened to a certain extent without installing a special flushing valve, so that a series of fault risks of variable pumps, variable motors, neutral sliding and the like are increased; and, after pump, motor damage, in the change old spare link, because of restriction such as condition, equipment, be unlikely to carry out the normal washing to current pipeline, the remaining partial abrasive dust of so pipeline can continue to cause the quality hidden danger to follow-up pipeline.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a hydrostatic travel drive circulation flushing control system, which can separate circulation flushing from travel drive operation and can perform independent circulation flushing according to actual needs.

In order to achieve the above object, the present invention provides a hydrostatic walking drive circulating flushing control system, which includes an oil tank, a pump assembly connected to the oil tank, and a motor assembly driven by the pump assembly to operate, wherein the pump assembly has a first pump oil inlet and outlet and a second pump oil inlet and outlet, the motor assembly has a first motor oil inlet and outlet and a second motor oil inlet and outlet, the first pump oil inlet and outlet is connected to the first motor oil inlet and outlet through a first drive pipeline, and the second pump oil inlet and outlet is connected to the second motor oil inlet and outlet through a second drive pipeline; the hydrostatic walking drive circulating flushing control system further comprises a circulating flushing assembly, the circulating flushing assembly comprises a first flushing pipeline connected with the first driving pipeline, a second flushing pipeline connected with the second driving pipeline, a shuttle valve, stop valves arranged on the first flushing pipeline and the second flushing pipeline, a reversing valve and a third flushing pipeline connected with the pump assembly, two ends of the shuttle valve are respectively connected with the first flushing pipeline and the second flushing pipeline, the first flushing pipeline, the second flushing pipeline and the third flushing pipeline are connected through the reversing valve, and the stop valves are located between the shuttle valve and the reversing valve.

Further, the circulating flushing assembly also comprises a pressure sensor, and the pressure sensor is connected with the shuttle valve.

Furthermore, the first flushing pipeline and the second flushing pipeline are both provided with a throttle valve.

Further, the reversing valve is a three-position four-way reversing valve.

Further, a check valve is arranged on the third flushing pipeline, and the check valve allows oil to flow from the reversing valve to the pump assembly.

Further, a filter is arranged on the third flushing pipeline.

Further, the pump assembly comprises a main pipeline connected with the oil tank, a variable pump and an oil replenishing pump which are arranged on the main pipeline, a servo valve connected with the variable pump and an overflow valve, the first pump oil inlet and outlet and the second pump oil inlet and outlet are communicated with the variable pump, the first pump oil inlet and outlet and the second pump oil inlet and outlet are communicated with the oil replenishing pump, and the overflow valve and the oil replenishing pump are connected with a third flushing pipeline.

As described above, the hydrostatic walking drive circulation flushing control system according to the present invention has the following advantages:

in this application, can realize the holistic opening of circulation washing subassembly and close through control shuttle valve and stop valve: when the walking drive works, the circulating flushing assembly is closed, oil does not pass through the circulating flushing assembly, the circulating flushing assembly does not influence an oil way, and overflow heating is not generated; when the circulation is washed the operation, the circulation is washed the subassembly and is opened, and the effect that washes the subassembly through the fluid circulation flow in the pipeline under the circulation realizes washing the pipeline. Consequently, this application effectively realizes the circulation and washes the separation with the travel drive operation, can avoid the overflow to generate heat, can avoid the remaining partial abrasive dust of pipeline again to continue to cause the quality hidden danger to follow-up pipeline.

Drawings

FIG. 1 is a schematic diagram of the hydrostatic travel drive circulation flushing control system of the present application.

FIG. 2 is a logic control diagram of the hydrostatic travel drive circulation flush control system of the present application.

Description of the element reference numerals

10 pump assembly

11 first pump oil inlet and outlet

12 oil inlet and outlet of second pump

13 main pipeline

14 variable pump

15 oil supply pump

16 servo valve

17 relief valve

20 Motor assembly

21 first motor oil inlet and outlet

22 oil inlet and outlet of second motor

23 variable motor

24 proportional valve

30 first drive conduit

40 second drive conduit

50 circulation washing assembly

51 first flushing pipe

52 second flush line

53 shuttle valve

54 pressure sensor

55 change valve

56 third flushing pipe

57 stop valve

58 throttle valve

59 one-way valve

510 Filter

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

As shown in fig. 1, the present application provides a hydrostatic walk-driven circulation flushing control system, which includes a fuel tank, a pump assembly 10 connected to the fuel tank, a motor assembly 20 driven by the pump assembly 10, and a circulation flushing assembly 50. The pump assembly 10 is provided with a first pump oil inlet/outlet 11 and a second pump oil inlet/outlet 12, the first pump oil inlet/outlet 11 and the second pump oil inlet/outlet 12 are used for oil absorption and oil discharge respectively, and the functions are interchangeable; the motor assembly 20 is provided with a first motor oil inlet/outlet 21 and a second motor oil inlet/outlet 22, and the first motor oil inlet/outlet 21 and the second motor oil inlet/outlet 22 are respectively used for oil absorption and oil discharge and have interchangeable functions; the first pump oil inlet/outlet port 11 is connected to the first motor oil inlet/outlet port 21 through a first driving pipe 30, and the second pump oil inlet/outlet port 12 is connected to the second motor oil inlet/outlet port 22 through a second driving pipe 40. In particular, the circulating flushing assembly 50 includes a first flushing line 51 connected to the first driving line 30, a second flushing line 52 connected to the second driving line 40, a shuttle valve 53, a shut-off valve 57 provided on the first flushing line 51 and the second flushing line 52, a direction change valve 55, and a third flushing line 56 connected to the pump assembly 10, the shuttle valve 53 having both ends connected to the first flushing line 51 and the second flushing line 52, respectively, the first flushing line 51, the second flushing line 52, and the third flushing line 56 being connected through the direction change valve 55, the shut-off valve 57 being located between the shuttle valve 53 and the direction change valve 55.

In the hydrostatic travel drive circulation flushing control system, the opening and closing of the whole circulation flushing assembly 50 can be realized by controlling the shuttle valve 53: during the traveling driving operation, the shuttle valve 53 and the stop valve 57 are closed, the circulation flushing assembly 50 is closed, the pump assembly 10 supplies oil to the motor assembly 20 through the first driving pipeline 30 or the second driving pipeline 40, the oil does not pass through the circulation flushing assembly 50, and the circulation flushing assembly 50 does not affect the oil circuit, and overflow heating is not generated. In the circulation flushing operation, the stop valve 57 is opened, the reversing valve 55 is correspondingly opened, and the circulation flushing assembly 50 is opened, so that the first pump oil inlet/outlet 11 or the second pump oil inlet/outlet 12 of the pump assembly 10, which performs the oil discharge function, is a high-pressure side, and the high-pressure side outputs oil. Specifically, when the first pump oil inlet/outlet 11 is on the high pressure side and discharges oil, the oil discharged from the pump assembly 10 sequentially flows into the first driving pipeline 30, the first flushing pipeline 51, the stop valve 57 on the first flushing pipeline 51, the reversing valve 55, and the third flushing pipeline 56, and then flows into the pump assembly 10, and the shuttle valve 53 disconnects the second flushing pipeline 52 on the low pressure side; when the second pump oil inlet/outlet 12 is on the high-pressure side and discharges oil, the oil discharged from the pump assembly 10 sequentially flows into the second driving pipeline 40, the second flushing pipeline 52, the stop valve 57 on the second flushing pipeline 52, the reversing valve 55 and the third flushing pipeline 56, and then flows into the pump assembly 10, and the shuttle valve 53 disconnects the first flushing pipeline 51 on the low-pressure side; thus, the pipeline is flushed. Consequently, this application has set up the circulation of independent module and has washed subassembly 50, effectively realizes the circulation and washes the separation with the travel drive operation, can avoid the overflow to generate heat, can avoid the remaining partial abrasive dust of pipeline again to continue to cause the quality hidden danger to follow-up pipeline, improves the flushing performance, satisfies the independent demand separately of general closed system to heat dissipation and blowdown.

Further, the stop valve 57 may be a manually opened manual ball valve or an electrically controlled ball valve that is opened by electrical control, so as to realize reliable sealing of the flushing oil path during the walking driving operation. The reversing valve 55 is a three-position four-way reversing valve, the three-position four-way reversing valve is in a middle position when not powered by default, and the middle position of the three-position four-way reversing valve is O-shaped, so that an oil path can be locked. Of course, in other embodiments, the directional valve 55 may be a proportional directional valve, allowing for adjustment of the flushing pressure. In addition, the hydronic flushing assembly 50 should be installed as close to the motor side as possible so that the flushing oil can cover the entire vehicle line.

Further, as shown in FIG. 1, the circulating flushing assembly 50 further includes a pressure sensor 54, the pressure sensor 54 being connected to the shuttle valve 53 for monitoring the flushing pressure of the system; meanwhile, in the circulating flushing operation, the displacement of the pump assembly 10 can be indirectly detected. A throttle valve 58 is arranged on each of the first flushing pipeline 51 and the second flushing pipeline 52, and the throttle valve 58 is positioned between the reversing valve 55 and the stop valve 57; the throttle valve 58 is used for adjusting the flow rate, and can be confirmed according to the required flushing flow rate and back pressure, if the required flow rate is 100L/min, and the high-pressure side pressure is more than 20MPa, the throttle equivalent damping diameter is about phi 3 mm. The purpose of throttling is to improve the pressure of a high-pressure side pipeline in the system, and on the other hand, the throttling is used as damping heating oil to improve the temperature of flushing circulating oil, so that the throttling valve 58 can be replaced by an overflow valve or a proportional overflow valve to further improve the circulating flushing control; the oil temperature is generally limited to a maximum of 70 ℃.

Further, as shown in FIG. 1, a check valve 59 is provided in the third flushing line 56, the check valve 59 allowing oil to flow from the reversing valve 55 to the pump assembly 10. A filter 510 is provided on the third flush line 56. The oil heated by the throttle valve 58 flows into the pump assembly 10 after passing through the check valve 59 and the filter 510, and the filter 510 filters the flushed oil to prevent impurities from entering the pump assembly 10.

Further, as shown in fig. 1, the pump assembly 10 includes a main pipe 13 connected to the oil tank, a variable pump 14 and an oil replenishment pump 15 both disposed on the main pipe 13, a servo valve 16 connected to the variable pump 14, and an overflow valve 17, the first pump oil inlet/outlet port 11 and the second pump oil inlet/outlet port 12 both communicate with the variable pump 14, the first pump oil inlet/outlet port 11 and the second pump oil inlet/outlet port 12 both communicate with the oil replenishment pump 15, and the overflow valve 17 and the oil replenishment pump 15 both communicate with the third flushing pipe 56. The motor assembly 20 includes two variable displacement motors 23, and a proportional valve 24 connected to each variable displacement motor 23. In addition, embodiments of the hydrostatic walk-driven circulation flush control system include a control system, and an enable switch and a purge button, all disposed within the vehicle cab, with the enable switch, purge button, servo valve 16 in pump assembly 10, and diverter valve 55 and shut-off valve 57 in circulation flush assembly 50 all being connected to the control system.

In summary, as shown in fig. 1 and 2, the hydrostatic walk-driven circulation flushing control system described above operates as follows.

Firstly, the walking driving process is as follows: operating a shift lever in the cab of the vehicle determines the oil drain for the pump assembly 10. When the forward gear handle is engaged in the forward gear, the left electromagnet of the servo valve 16 in the pump assembly 10 is energized; after the accelerator is slightly stepped, the servo valve 16 controls the swash plate inside the variable pump 14 to leave the zero position, so that oil is absorbed from the oil inlet/outlet 11 side of the first pump, oil is discharged from the oil inlet/outlet 12 side of the second pump, and a certain flow is proportionally output; when the line pressure at the port side of the oil inlet/outlet 12 of the second pump reaches a value that can overcome the resistance moment applied to the variable motor 23 by the ground through wheels, a speed reducer and the like, the vehicle starts to move forward, the oil discharged by the variable motor 23 is low-pressure return oil, the low-pressure return oil directly returns to the oil suction side of the oil inlet/outlet 11 of the first pump of the pump assembly 10 from the oil inlet/outlet 21 of the first motor through the first driving pipeline 30, the oil in the closed oil line is circulated and reciprocated all the time, and part of the return oil existing in real time after a flushing valve is not installed conventionally is shunted to an oil tank, so the oil supplementing pump 15 of the pump assembly 10 is only used for compensating the self leakage of the variable pump 14 and the variable motor 23. The heat of the system is exchanged and balanced in the internal leakage mode. When the backward gear handle is in backward gear, the right electromagnet of the servo valve 16 in the pump assembly 10 is electrified; after the accelerator is slightly stepped, the servo valve 16 controls the swash plate inside the variable pump 14 to leave the zero position, so that oil is absorbed from the oil inlet/outlet 12 side of the second pump, oil is discharged from the oil inlet/outlet 11 side of the first pump, and a certain flow is proportionally output; when the line pressure at the port side of the first pump oil inlet/outlet port 11 reaches a value that can overcome the resistance moment applied to the variable motor 23 by the ground through wheels, a speed reducer and the like, the vehicle starts to travel backwards, the oil discharged by the variable motor 23 is low-pressure return oil, the low-pressure return oil directly returns to the oil suction side of the second pump oil inlet/outlet port 12 of the pump assembly 10 from the second motor oil inlet/outlet port 22 through the second driving pipeline 40, and the oil is circulated and reciprocated in this way. During the travel driving, the shuttle valve 53, the stop valve 57 and the change valve 55 are all in the closed state, and the oil does not flow in the circulation flushing assembly 50.

Secondly, when the variable pump 14 or the variable motor 23 is damaged due to the service life limitation or the failure, or the system oil medium needs to be replaced, or the system cleanliness needs to be maintained, the pipeline needs to be specially flushed. In the flushing, first, an enable switch in the cab is pressed, and the control system controls the opening of both the directional valve 55 and the stop valve 57. Secondly, the control system judges whether the vehicle is in neutral gear or not by acquiring a gear handle signal of the vehicle. When the vehicle is judged to be in neutral, the control system obtains a parking signal of the vehicle to judge whether the vehicle is parked. And then, when the vehicle is judged to be parked, the control system carries out parameter setting, such as: setting the minimum value of the displacement of the variable displacement motor 23, the rotational speed of the engine, the flow rate of the variable displacement pump 14, the variable displacement pump 14 restriction adaptive determination based on the output maximum pressure, etc., controls a certain purge pressure, which is controlled at an appropriate value, such as 5MPa, by monitoring of the pressure sensor 54, adjustment of the throttle valve 58, and displacement control of the variable displacement pump 14. Then, the pump assembly 10, the motor assembly 20 and the pipeline are washed for a period of time in a forward and reverse rotation cycle in the parking state: manually opening the stop valve 57; when a cleaning button in a cab is pressed, the default that the vehicle firstly moves forward and carries out forward flushing is carried out, the left electromagnet of the servo valve 16 in the pump assembly 10 is electrified, the oil inlet/outlet 12 of the second pump is a high-pressure side and discharges oil, and the control system controls the right electromagnet of the reversing valve 55 to be electrified; part of high-pressure oil discharged from the oil inlet/outlet 12 of the second pump sequentially flows into the second driving pipeline 40, the second flushing pipeline 52, the stop valve 57 and the throttle valve 58 on the second flushing pipeline 52 and then flows into the reversing valve 55, and then sequentially flows into the pump assembly 10 through the third flushing pipeline 56, the one-way valve 59 and the filter 510 by the right position of the reversing valve 55, so that the high-pressure oil is recycled after being filtered, and the other part of the high-pressure oil enters the idle variable displacement motor 23 through the second driving pipeline 40 and then returns to the pump assembly 10 through the first driving pipeline 30; after forward flushing is carried out for a period of time, the control system switches the vehicle to reverse and carries out reverse flushing, then the right electromagnet of the servo valve 16 in the pump assembly 10 is electrified, the first pump oil inlet/outlet 11 is a high-pressure side and discharges oil, and the control system controls the left electromagnet of the reversing valve 55 to be electrified; a part of high-pressure oil discharged from the oil inlet/outlet 11 of the first pump sequentially flows into the first driving pipeline 30, the first flushing pipeline 51, the stop valve 57 and the throttle valve 58 on the first flushing pipeline 51 and then flows into the reversing valve 55, then flows into the pump assembly 10 through the third flushing pipeline 56, the one-way valve 59 and the filter 510 sequentially from the left position of the reversing valve 55, so that the high-pressure oil is recycled after being filtered, and the other part of high-pressure oil enters the idle variable displacement motor 23 through the first driving pipeline 30 and then returns to the pump assembly 10 through the second driving pipeline 40; after repeated forward and reverse cleaning, impurities such as oil sludge, scrap iron and the like attached to the pipe wall or a step gap and the like in the pipeline can be effectively removed.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.