WO2013060233A1

WO2013060233A1 - Pumping device, hydraulic distribution system and heating method thereof

Info

Publication number: WO2013060233A1
Application number: PCT/CN2012/082690
Authority: WO
Inventors: 李沛林
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-10-24
Filing date: 2012-10-10
Publication date: 2013-05-02
Also published as: CN102418725A; CN102418725B

Abstract

Disclosed in the present invention are a pumping device, a hydraulic distribution system and a heating method thereof. The hydraulic distribution system comprises a hydraulic pump (1), a direction valve (7), a check valve (2), an accumulator (5) and a pressure control assembly. The hydraulic distribution system comprises a working mode and a heating mode, wherein, in the heating mode, the hydraulic pump (1) is able to drive the hydraulic oil to overflow through the pressure control assembly, so that the hydraulic energy is converted into heat energy, and then the temperature of the hydraulic oil can be raised by the heat energy. Thus, the hydraulic oil can be heated evenly without the need for an additional heater.

Description

Pumping device and its distribution hydraulic system and heating method

Technical field

The invention relates to the field of engineering machinery, in particular to a viscous material pumping device. Background technique

In modern engineering construction, viscous material pumping equipment is commonly used. For example, in the construction field, pumping equipment is often used to cast concrete. The same pumping equipment is often used in different regions and seasons, and the ambient temperature varies greatly. The pumping equipment is generally driven by a hydraulic system. When the temperature of the hydraulic medium is too low, the viscosity increases, which makes it difficult to start the suction of the oil pump. When the temperature is too high, the oil is easily deteriorated and the efficiency of the hydraulic components is lowered.

At present, there are several ways to adapt the hydraulic system to different ambient temperatures: (1) Use different types of hydraulic oil to adapt to different ambient temperatures. When the ambient temperature is low, use low viscosity, low pour point hydraulic oil or low temperature hydraulic oil. When the ambient temperature is high, a higher viscosity hydraulic oil is used. (2) Use a heater and a cooler to control the temperature of the oil. When the temperature is low, it is heated by a heater. When the temperature is high, it is cooled by a cooler.

At present, the technology for preventing excessive oil temperature is relatively mature, but there are still some defects in the measures for low temperature environment. (1) It is cumbersome to replace different types of hydraulic oil. It is necessary to consider the compatibility of different types of hydraulic oil. At the same time, the cost of replacing hydraulic oil is also high. The replacement of hydraulic oil is troublesome to store and handle, and low temperature hydraulic oil. The general price is relatively high. (2) The heater requires a large power supply, which is sometimes difficult for the diesel engine to drive. In addition, heating with a heater sometimes deteriorates the hydraulic oil due to local overheating. Summary of the invention

The technical problem to be solved by the present invention is to provide a distribution hydraulic system capable of heating hydraulic oil, a pumping apparatus using the same, and a heating method therefor. In order to solve the above technical problems, the present invention adopts the following technical solutions:

A pumping apparatus dispensing hydraulic system is provided, the dispensing hydraulic system including a hydraulic pump, a reversing valve, a one-way valve, an accumulator, and a pressure control assembly; the dispensing hydraulic system includes an operating mode and a heating mode, wherein, in heating In the mode, the hydraulic pump drives hydraulic oil to overflow through the pressure control component, so that the hydraulic energy converts thermal energy and raises the oil temperature.

Preferably, the hydraulic pump comprises a constant pressure pump, in the operating mode, the pressure cutoff value of the constant pressure pump is smaller than the overflow pressure value of the pressure control component; in the heating mode, the pressure of the constant pressure pump The cutoff value is greater than the overflow pressure value of the pressure control assembly.

Preferably, in the heating mode, the relief pressure value of the pressure control assembly is unchanged, and the pressure cutoff value of the constant pressure pump is raised to be greater than the relief pressure value of the pressure control assembly.

Preferably, the constant pressure pump comprises an electrically controlled constant pressure pump, and the cut-off pressure value of the electronically controlled constant pressure pump can be electrically adjusted.

Preferably, in the heating mode, the pressure cutoff value of the constant pressure pump is constant, and the overflow pressure value of the pressure control assembly is adjusted to be lower than the pressure cutoff value of the constant pressure pump. Preferably, the pressure control assembly includes a proportional pressure valve; in the operating mode, the pressure cutoff value of the constant pressure pump is lower than the overflow pressure value of the proportional pressure valve; in the heating mode, the proportional pressure valve The overflow pressure value is adjusted to be lower than the pressure cutoff value. Preferably, the pressure control assembly comprises a relief valve and a proportional pilot pressure valve/electromagnetic proportional valve/manual pilot pressure valve connected to the remote control port of the relief valve; in the working mode, the pressure of the constant pressure pump is cut off The value is lower than the set relief pressure value of the proportional pilot valve/electromagnetic proportional valve/manual pilot pressure valve; in the heating mode, the proportional pilot valve/electromagnetic proportional valve/manual pilot pressure valve is set The overflow pressure value is adjusted to be lower than the pressure cutoff value.

Preferably, the pressure control component comprises a multi-stage relief valve group, the multi-stage relief valve group comprises a relief valve, a pilot pressure valve and a solenoid valve, and a remote control port of the relief valve is connected to the solenoid valve inlet, The solenoid valve outlet is connected to the pilot pressure valve; in the heating mode, the pilot pressure valve is set The pressure value is adjusted to be less than the pressure cutoff value of the constant pressure pump.

Preferably, the hydraulic pump includes a dosing pump, and the pressure control assembly includes an electromagnetic spill valve or an unloading relief valve. In the heating mode, the unloading function of the electromagnetic spill valve or the unloading relief valve is stopped.

Preferably, the dispensing hydraulic system includes a temperature detecting component for switching the dispensing hydraulic system from an operating mode to a heating mode when sensing that the oil temperature is lower than the first set value, and/or for When the oil temperature is higher than the second set value, the dispensing hydraulic system is switched from the heating mode to the operating mode, and the second set value is greater than or equal to the first set value.

The invention also provides a pumping apparatus comprising the dispensing hydraulic system of any of the above. Preferably, the pumping device is powered by an engine. The present invention also provides a heating method for dispensing a hydraulic system in any of the above, the method comprising the steps of:

(A) causing the dispensing hydraulic system to enter a heating mode when the oil temperature is lower than the first set value;

(B) starting the hydraulic pump, the hydraulic oil overflowing through the distribution hydraulic system, converting hydraulic energy into heat energy, which increases the oil temperature.

Preferably, the method further includes the step (C): when the oil temperature rises above the second set value, causing the dispensing hydraulic system to stop overflowing, the dispensing hydraulic system enters an operating mode; the second set value is greater than or Equal to the first set value.

Preferably, step (A) is that the ambient temperature is lower, causing the oil temperature to be lower than the first set value, before starting the pumping; or because the standby time is too long, causing the oil temperature to drop below Performed when the first set value is described.

Preferably, in the heating mode, the hydraulic pump operates at a low speed.

Compared with the related art, the hydraulic oil is heated by the distribution hydraulic system of the present invention, and there are many advantages, for example, the hydraulic oil can be uniformly heated, and the local temperature is too high to cause the hydraulic oil to deteriorate; in addition, since the oil continuously flows , there will be no overheating of the oil; in addition, the heating of the hydraulic components of the system itself, without the need to add additional heaters and other high-power appliances, More suitable for engine powered pumping equipment. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a distribution hydraulic system using a constant pressure pump in the related art.

Fig. 2 is a schematic diagram of a dispensing hydraulic system using a metering pump in the related art.

Figure 3 is a schematic view of a dispensing hydraulic system in the first embodiment of the present invention.

Figure 4 is a schematic view of a dispensing hydraulic system in a second embodiment of the present invention.

Figure 5 is a schematic view of a dispensing hydraulic system in a third embodiment of the present invention. detailed description

The present invention will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings.

In the pumping equipment, the control and drive distribution valve operates to distribute the hydraulic system. There are various types of distribution valves, such as S-shaped pendulum valves, C-shaped valves, and inclined gate valves. At present, in the pumping equipment, since the operation time of the distribution valve is very short, the movement speed is very fast, and the pressure is required after the operation. The distribution hydraulic system of the pumping equipment generally adopts a pressure maintaining circuit with an accumulator. The distribution system has two commonly used pressure holding circuits, namely a pressure holding circuit using a constant pressure pump and a pressure holding circuit using a metering pump.

1 is a schematic diagram of a dispensing hydraulic system 100 using a constant pressure pump including a constant pressure pump 1, a check valve 2, a relief valve 3, a pressure gauge (or pressure sensor) 4, an accumulator 5, The electromagnetic reversing valve 6, the reversing valve 7, and the oscillating cylinders 8, 9, wherein the relief valve 3 is the pressure control assembly of the system 1. During the working process, after the constant pressure pump 1 is started, the accumulator 5 is pressurized. Since the pressure cutoff value of the constant pressure pump 1 is smaller than the overflow pressure value of the relief valve 3, when the pressure is up to the constant pressure pump 1 pressure cutoff setting value When the constant pressure pump 1 displacement is automatically adjusted to be used only to supplement the system leakage, the system maintains pressure. When the reversing valve 7 is actuated, the accumulator 5 supplies oil together with the constant pressure pump 1, and the oscillating cylinders 8, 9 are actuated by the reversing valve 7, and the accumulator 5 is depressurized, and the oscillating cylinders 8, 9 are in place. After that, the constant pressure pump 1 pressurizes the accumulator 5 again, and when the set value is reached, the system maintains pressure. This cycle. 2 is a simplified diagram of a dispensing hydraulic system 200 employing a metering pump. The distribution hydraulic system 200 includes a dosing pump la, a check valve 2a, an electromagnetic spill valve 3a, a pressure gauge (or pressure sensor) 4a, an accumulator 5a, an electromagnetic reversing valve 6a, a reversing valve 7a, and a swing cylinder 8a, 9a. During the operation, after the metering pump la is started, the accumulator 5a is pressurized. When the charging pressure reaches the set value, the metering pump la is unloaded through the electromagnetic spill valve 3a, and the system uses the accumulator 5a system to maintain the pressure. When the reversing valve 7a is actuated, the accumulator 5a releases the pressure oil, and the swing cylinders 8a, 9a are pushed by the reversing valve 7a, and the accumulator 5a is depressurized, and the dosing pump la stops unloading, and the accumulator is 5a is pressurized, when the set value is reached, the system maintains pressure. This cycle. It can be understood that in the distribution hydraulic system 200, the electromagnetic spill valve 3a can also be replaced with an unloading relief valve. When the system reaches the set pressure of the unloading relief valve, the unloading relief valve is unloading the dosing pump la .

In the above-described distribution hydraulic systems 100 and 200, when the ambient temperature is low, the oil temperature at the time of starting is also low. When the oil temperature is too low, in order to make the hydraulic system work normally, it is generally necessary to heat the hydraulic oil. For the point in time when heating is initiated, the system oil temperature will gradually increase as the system operates for a period of time. Therefore, when the ambient temperature is low, the system can work normally if the oil temperature is heated in the following two states: (1) Preheating the oil temperature before the concrete equipment is operated; (2) When the concrete equipment stands by Longer time, resulting in lower system oil temperature, preheating the oil temperature before starting again.

Figure 3 illustrates a dispensing hydraulic system 300 in a first embodiment of the present invention that includes an operating mode and a heating mode that, in the heating mode, can heat hydraulic oil. The principle of the distribution hydraulic system 300 is similar to the principle of the distribution hydraulic system 100 shown in FIG. 1, and the difference is mainly to replace the constant pressure pump 1 of the distribution hydraulic system 100 with the electronically controlled constant pressure pump lb, the electronically controlled constant pressure pump lb. The pressure cutoff value can be automatically adjusted by electrical. When the oil temperature is lower than the first set value and heating is required, the pressure cutoff value of the electronically controlled constant pressure pump lb is electrically adjusted so that the pressure cutoff value is higher than the overflow pressure value of the relief valve 3, and enters the heating mode. When the constant pressure pump lb is activated, preferably, in the heating mode, the electrically controlled constant pressure pump lb operates at a low speed. The constant pressure pump lb pressurizes the accumulator 5, and the system pressure is continuously increased, so that the relief pressure value of the relief valve 3 is lower than the pressure cutoff value, therefore, The relief valve 3 first acts, the displacement of the constant pressure pump lb is constant, and the system flow is completely returned from the relief valve 3 to the fuel tank, and the hydraulic energy is converted into heat, which causes the temperature of the oil to rise. When the oil temperature rises above the second set value, the pressure cutoff value of the electronically controlled constant pressure pump lb is adjusted back to the original value, and the distribution hydraulic system 300 can drive and control the operation of the distribution valve, and enter the working mode. . The second set value is greater than or equal to the first set value.

It is to be understood that the dispensing hydraulic system 300 can further include a temperature detecting element for switching the dispensing hydraulic system 300 from the operating mode to the heating mode when the oil temperature is sensed to be lower than the first set value, and/or When the oil temperature is sensed to be higher than the second set value, the dispensing hydraulic system 300 is switched from the heating mode to the operating mode.

Figure 4 shows a dispensing hydraulic system 400 in a second embodiment of the invention, the dispensing hydraulic system

400 is similar to the distribution hydraulic system 300. The main difference is that the constant pressure pump 1 of the distribution hydraulic system 400 uses a common constant pressure pump, and the remote control port of the relief valve 3c is connected with the proportional pilot pressure valve 10 to achieve stepless adjustment. Pressure. In the working mode, the pressure cutoff value of the constant pressure pump 1 is lower than the overflow pressure value set by the proportional pilot pressure valve 10. When the ambient temperature is low and the hydraulic oil needs to be heated, the proportional pilot pressure valve 10 overflows. The flow pressure value is adjusted to be lower than the pressure cutoff value of the constant pressure pump 1. In operation, the constant pressure pump 1 pressurizes the accumulator 5, and when the pressure rises to the overflow pressure value set by the proportional pilot pressure valve 10, the overflow The flow valve 3c is opened, and the system flow is completely returned from the overflow valve 3c to the oil tank, and the hydraulic energy is converted into heat to raise the temperature of the hydraulic oil. It can be understood that in other embodiments, the relief valve 3c and the proportional pilot pressure valve 10 can also be replaced by an electromagnetic proportional valve or other suitable proportional pressure valve, or the proportional pilot pressure valve 10 can be changed to a manual pilot pressure valve, manually. Adjust the system overflow pressure.

Figure 5 shows a dispensing hydraulic system 500 in a third embodiment of the present invention, which is similar to the dispensing hydraulic system 400. The main difference is that the relief valve 3d is remotely connected to the solenoid valve 12 inlet, and the solenoid valve 12 is connected to the pilot. The pressure valve 11, when the solenoid valve 12 is de-energized, the system relief valve pressure is set by the relief valve 3d, and when the solenoid valve 12 is energized, the system relief pressure is set by the pilot pressure valve 11. Thus, the system has two overflow pressure values such that the overflow pressure value of the pilot pressure valve 11 is less than the pressure cutoff value of the constant pressure pump 1, and the overflow pressure value of the relief valve 3d is higher than the pressure cutoff value of the constant pressure pump 1. Then, in the working mode, the solenoid valve 12 is de-energized, the system relief pressure is set by the relief valve 3d, and the pressure cut of the constant pressure pump 1 acts before the relief valve 3d, and the system does not overflow. When in the heating mode, the solenoid valve 12 is energized, the system relief pressure is set by the pilot pressure valve 11, the pilot pressure valve 11 acts before the pressure of the constant pressure pump 1 is cut off, the system first overflows, and the system flow is all from the overflow. The valve 3d flows back to the tank, the hydraulic energy is converted into heat, and the temperature of the oil rises.

The schematic diagram of the distribution hydraulic system in the fourth embodiment of the present invention is the same as FIG. 2, that is, the quantitative pump is used, and the distribution hydraulic system also includes the working mode and the heating mode. In the working mode, when the system pressure rises to the required value, the electromagnetic The relief valve 3a is unloaded. When the oil temperature is low and heating is required, the control electromagnet is always in a power-off state, so that the electromagnetic spill valve 3a stops the unloading function, and enters the heating mode, when the system pressure rises to the overflow pressure value of the electromagnetic spill valve 3a. At this time, the system flow overflows from the overflow valve 3a and flows back to the tank, and the hydraulic energy is converted into heat, which causes the temperature of the pressure oil to rise.

The above-mentioned distribution hydraulic system with heating mode and working mode can bring a lot of beneficial effects. For example, the hydraulic oil can be uniformly heated, and the local oil temperature does not cause the hydraulic oil to deteriorate. In addition, since the hydraulic oil continuously flows, it will not Hydraulic oil overheating occurs; furthermore, because the system uses its own hydraulic components for heating, it does not need to add high-power appliances such as heaters, and is more suitable for engine-powered pumping equipment.

The above description is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, and all the technical solutions under the inventive concept belong to the protection scope of the present invention. It should be noted that those skilled in the art will be able to devise a number of modifications and refinements without departing from the principles of the invention.

Claims

Rights request

A pumping apparatus dispensing hydraulic system comprising a hydraulic pump, a reversing valve, a check valve, an accumulator, and a pressure control assembly; wherein the dispensing hydraulic system includes an operating mode and a heating mode In the heating mode, the hydraulic pump drives hydraulic oil to overflow through the pressure control component, so that the hydraulic energy converts thermal energy and raises the oil temperature.

2. The dispensing hydraulic system according to claim 1, wherein the hydraulic pump comprises a constant pressure pump, and in the operating mode, the pressure cutoff value of the constant pressure pump is less than the overflow pressure of the pressure control assembly a value; in the heating mode, the pressure cutoff value of the constant pressure pump is greater than the overflow pressure value of the pressure control assembly.

3. The dispensing hydraulic system according to claim 2, wherein in the heating mode, the overflow pressure value of the pressure control assembly is constant, and the pressure cutoff value of the constant pressure pump is raised to be greater than The overflow pressure value of the pressure control assembly.

4. The dispensing hydraulic system according to claim 3, wherein the constant pressure pump comprises an electrically controlled constant pressure pump, and the cut-off pressure value of the electronically controlled constant pressure pump can be electrically adjusted.

5. The dispensing hydraulic system according to claim 2, wherein in the heating mode, the pressure cutoff value of the constant pressure pump is constant, and the overflow pressure value of the pressure control assembly is reduced to less than The pressure cutoff value of the constant pressure pump is described.

6. The dispensing hydraulic system of claim 5, wherein said pressure control The component includes a proportional pressure valve; in the operating mode, the pressure cutoff value of the constant pressure pump is lower than the overflow pressure value of the proportional pressure valve; in the heating mode, the overflow pressure value of the proportional pressure valve is adjusted Dropped below the pressure cutoff value.

7. The dispensing hydraulic system according to claim 5, wherein the pressure control assembly comprises a relief valve and a proportional pilot pressure valve/electromagnetic proportional valve/manual pilot pressure valve connected to a remote control port of the relief valve. In the working mode, the pressure cutoff value of the constant pressure pump is lower than the set overflow pressure value of the proportional pilot pressure valve/electromagnetic proportional valve/manual pilot pressure valve; in the heating mode, the proportional pilot The set relief pressure value of the pressure valve/electromagnetic proportional valve/manual pilot pressure valve is adjusted to be lower than the pressure cutoff value.

8. The dispensing hydraulic system according to claim 5, wherein the pressure control assembly comprises a multi-stage relief valve group including a relief valve, a pilot pressure valve, and a solenoid valve. a remote control port of the relief valve is connected to the solenoid valve inlet, and the solenoid valve outlet is connected to the pilot pressure valve; in the heating mode, the pilot pressure valve setting pressure value is adjusted to be lower than the pressure of the constant pressure pump Cut off the value.

9. The dispensing hydraulic system of claim 1 wherein: said hydraulic pump comprises a metering pump, said pressure control assembly comprising an electromagnetic spill valve or an unloading relief valve, in a heating mode, an electromagnetic spill valve Or the unloading function of the unloading relief valve is stopped.

10. The dispensing hydraulic system according to claim 1, wherein the dispensing hydraulic system includes a temperature detecting element for, when the oil temperature is sensed to be lower than a first set value, the dispensing hydraulic system is Switching the operating mode to heating mode, and/or for sensing that the oil temperature is higher than the second setting When the value is fixed, the distribution hydraulic system is switched from the heating mode to the operating mode, and the second set value is greater than or equal to the first set value.

A pumping apparatus, comprising the dispensing hydraulic system of any of claims 1-10.

12. The pumping apparatus of claim 11 wherein the pumping apparatus is powered by an engine.

13. A method of heating a pumping apparatus according to any of claims 11-12, characterized in that the method comprises the steps of:

(B) Starting the hydraulic pump, the hydraulic oil overflows through the distribution hydraulic system, and converts the hydraulic energy into heat energy, which increases the oil temperature.

14. The method of heating a pumping apparatus according to claim 13, further comprising the step (C) of: causing the dispensing hydraulic system to stop overflowing when the oil temperature rises above a second set value, The dispensing hydraulic system enters an operating mode; the second set value is greater than or equal to the first set value.

15. The heating method of a pumping apparatus according to claim 13, wherein the step (A) is that the ambient temperature is lower, causing the oil temperature to be lower than the first set value, before the pumping is started. Or when the oil temperature drops below the first set value due to the long standby time.

16. The heating method of a pumping apparatus according to any one of claims 13 to 15, characterized in that, in the heating mode, the hydraulic pump is operated at a low speed.