阅读说明：本技术 一种挖掘机液压油暖机系统及其控制方法 (Excavator hydraulic oil warming system and control method thereof ) 是由 孙海冬 赵光 费树辉 夏炎 宋萌 王东 范凯俊 赵映龙 樊云鹏 樊帅 于 2021-06-22 设计创作，主要内容包括：本发明属于工程机械领域,涉及一种挖掘机液压油暖机系统及其控制方法,包括液压管路,所述液压管路包括顺次连接的主泵、主阀、电液控换向阀组、冷却器及液压油箱,所述电液控换向阀组与控制器电连,所述控制器通过温度传感器采集液压油箱中的液压油温度,并根据液压油温度控制电液控换向阀组换向,从而控制冷却器接入或切出所述液压管路。本发明可以实现一种直驱风扇挖掘机在冬季寒冷地区开机时,可以使液压油油温快速达到工作油温,缩短挖掘机在寒冷地区液压油暖机时间,使挖掘机快速进入最佳工作状态。(The invention belongs to the field of engineering machinery, and relates to a hydraulic oil warming system of an excavator and a control method thereof. The invention can realize that when the direct-drive fan excavator is started in a cold area in winter, the hydraulic oil temperature can quickly reach the working oil temperature, the hydraulic oil warming-up time of the excavator in the cold area is shortened, and the excavator can quickly enter the optimal working state.)

1. The utility model provides an excavator hydraulic oil warm-up system, its characterized in that includes hydraulic line, hydraulic line is including main pump, main valve, electric liquid accuse switching-over valves, cooler and the hydraulic tank who connects in order, electric liquid accuse switching-over valves links with the controller electricity, the controller passes through the hydraulic oil temperature in the temperature sensor collection hydraulic tank to according to the switching-over of hydraulic oil temperature control electric liquid accuse switching-over valves, thereby control the cooler and insert or surely go hydraulic line.

2. The hydraulic oil warming system for the excavator according to claim 1, wherein a filter is provided between the hydraulic oil tank and the cooler for filtering impurities in the hydraulic oil.

3. The excavator hydraulic oil warming system of claim 1, wherein the electrohydraulic control directional valve bank comprises a pilot control directional valve and an electromagnetic directional valve; the hydraulic control reversing valve is connected with a hydraulic oil tank; and the electromagnetic reversing valve receives a control signal sent by the controller and controls the hydraulic control reversing valve to reverse.

4. The excavator hydraulic oil warming system as claimed in claim 1, wherein the excavator is a direct drive fan type excavator.

5. An excavator, characterized in that the excavator is provided with the excavator hydraulic oil warming system as claimed in any one of claims 1 to 4.

6. A control method of a hydraulic oil warming-up system of an excavator according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:

the temperature of hydraulic oil of the hydraulic oil tank is acquired through a temperature sensor:

when the temperature of the hydraulic oil is lower than a set lower limit value, controlling the electro-hydraulic control reversing valve group to cut the cooler out of the hydraulic pipeline;

and when the temperature of the hydraulic oil is higher than the set upper limit value, controlling the electro-hydraulic control reversing valve group to enable the cooler to be connected into the hydraulic pipeline.

7. The control method according to claim 6, wherein the control range of the temperature of the hydraulic oil is 40-60 ℃.

Technical Field

The invention belongs to the field of engineering machinery, and relates to a hydraulic oil warming system of an excavator and a control method thereof.

Background

At present, in cold regions in winter, because outdoor temperature is very low, the existing hydraulic oil warming machine of the direct-drive fan type excavator is mainly operated by pressure build-up, energy generated by overflow heats hydraulic oil, and most of heat is taken away by the hydraulic oil through a radiator, so that the hydraulic oil temperature can reach the optimal working oil temperature range only by pressure build-up for a long time.

In the prior art, the hydraulic oil is too long in warming time, and due to the fact that the viscosity of low-temperature hydraulic oil is high, abrasion and impact on hydraulic parts and a radiator caused by long-time pressure building operation are high, and the reliability of the hydraulic parts is reduced.

Disclosure of Invention

In order to solve the problems, the invention provides a hydraulic oil warming system of an excavator and a control method thereof. In cold areas in winter, when the direct-drive fan type excavator is started, the hydraulic oil temperature can quickly reach the working oil temperature, the hydraulic oil temperature in the hydraulic oil tank is in the optimal temperature range, and the excavator quickly enters the optimal working state.

The technical scheme provided by the invention is as follows:

the utility model provides an excavator hydraulic oil warm-up system, includes hydraulic line, hydraulic line is including main pump, main valve, electric liquid accuse switching-over valves, cooler and the hydraulic tank who connects in order, electric liquid accuse switching-over valves links with the controller electricity, the controller passes through the hydraulic oil temperature in the temperature sensor collection hydraulic tank to according to the switching-over of hydraulic oil temperature control electric liquid accuse switching-over valves, thereby control the cooler and insert or surely the hydraulic line.

Furthermore, a filter is arranged between the hydraulic oil tank and the cooler and used for filtering impurities in the hydraulic oil.

Furthermore, the electro-hydraulic control reversing valve group comprises a hydraulic control reversing valve and an electromagnetic reversing valve; the hydraulic control reversing valve is connected with a hydraulic oil tank; and the electromagnetic reversing valve receives a control signal sent by the controller and controls the hydraulic control reversing valve to reverse.

Further, the excavator is a direct-drive fan type excavator.

The invention further provides an excavator, and the excavator is provided with the excavator hydraulic oil warming system.

The invention also provides a control method of the excavator hydraulic oil warming system, which comprises the following steps:

the temperature of hydraulic oil of the hydraulic oil tank is acquired through a temperature sensor:

when the temperature of the hydraulic oil is lower than a set lower limit value, controlling the electro-hydraulic control reversing valve group to cut the cooler out of the hydraulic pipeline;

and when the temperature of the hydraulic oil is higher than the set upper limit value, controlling the electro-hydraulic control reversing valve group to enable the cooler to be connected into the hydraulic pipeline.

Further, the control interval of the temperature of the hydraulic oil is 40-60 ℃.

Advantageous effects

The invention can realize that when the direct-drive fan excavator is started in a cold area in winter, the hydraulic oil temperature can quickly reach the working oil temperature, the hydraulic oil warming-up time of the excavator in the cold area is shortened, and the excavator can quickly enter the optimal working state.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus of the present invention.

Fig. 2 is a schematic view of an operating state of the electromagnetic directional valve set.

1. A controller; 2. an electro-hydraulic control reversing valve bank; 3. a temperature sensor; 4. a hydraulic oil tank; 5. a filter; 6. a cooler; 7. a main valve; 8. and (4) a main pump.

Detailed Description

Example 1

In cold areas in winter, when a direct-drive fan type excavator is started, in order to enable the temperature of hydraulic oil to quickly reach the temperature of working oil, the temperature of the hydraulic oil in a hydraulic oil tank is in an optimal temperature range of 40-60 degrees, the invention provides a hydraulic oil warming system of the excavator.

The technical scheme adopted by the invention is as follows:

a hydraulic oil warming system of an excavator mainly comprises: the hydraulic control system comprises a controller 1, an electro-hydraulic control reversing valve group 2, a temperature sensor 3, a hydraulic oil tank 4, a filter 5, a cooler 6, a main valve 7, a main pump 8 and the like.

The electro-hydraulic control reversing valve group 2, the hydraulic oil tank 4, the filter 5, the cooler 6, the main valve 7 and the main pump 8 are communicated through hydraulic pipelines.

The electro-hydraulic control reversing valve group 2 and the temperature sensor 3 are connected with an input port of the controller 1 through an electric wire harness.

The controller 1 receives signals acquired by the temperature sensor, analyzes, calculates and processes the signals, and sends control signals to the electromagnetic directional valve set;

the electromagnetic directional valve group 2 receives a control signal sent by a controller and controls whether the return oil of the hydraulic oil passes through a cooler or not;

the temperature sensor 3 collects temperature information of hydraulic oil in the hydraulic oil tank 4 and transmits the temperature information to the controller 1;

the hydraulic oil tank 4 stores hydraulic oil required by a hydraulic system;

the filter 5 filters impurities in the hydraulic oil to ensure the cleanness of the hydraulic oil in the hydraulic system;

the cooler 6 reduces the temperature of hydraulic oil in the hydraulic system, so that the hydraulic oil is kept within the optimal working range of 40-60 degrees;

the main valve 7 controls each action control element of the excavator;

the main pump 8 is a power element of a hydraulic system of the excavator.

The working principle is as follows:

in cold areas in winter, when a direct-drive fan type excavator is started, a controller 1 receives an input signal of low temperature (-below 20 ℃) of hydraulic oil collected by a temperature sensor 3, the controller analyzes and processes the input low temperature signal and controls a pilot oil way, and outputs a signal to an electromagnetic reversing valve a in an electric-hydraulic reversing valve group 2 to enable the electromagnetic reversing valve a to work at an upper position (shown in figure 2), and pilot oil enters a Pi port of a hydraulic control reversing valve through a P port of the electric-hydraulic reversing valve group 2 to enable a hydraulic control reversing valve b to work at a right position (shown in figure 2); the hydraulic oil of the main oil way flows back to the hydraulic oil tank 4 through the hydraulic oil tank 4, the main pump 8, the main valve 7, the hydraulic control reversing valve and the filter 5, and the energy generated by overcoming the local pressure loss and the on-way pressure loss of the pipeline is utilized to do work on the hydraulic oil in the circulating process, so that the oil temperature of the hydraulic oil quickly reaches the optimal working oil temperature range of 40-60 degrees, and the excavator quickly enters the optimal working state. And (3) rapidly heating the hydraulic oil by using the energy lost by the return oil through small circulation (without passing through a radiator).

The electro-hydraulic control reversing valve group 2: the hydraulic control reversing valve consists of a hydraulic control reversing valve b and an electromagnetic reversing valve a.