Hydraulic oil temperature control system with composite heat dissipation

Abstract

The application discloses a kind of composite heat dissipation hydraulic oil temperature control system, comprising: hydraulic oil tank;Heat dissipation hydraulic pump, connect hydraulic oil tank and electronically controlled engine, electronically controlled engine controls heat dissipation hydraulic pump operating speed;Composite radiator, with hydraulic oil cooler and heat dissipation motor, for the cooling of engine and hydraulic system;Radiator drive valve group, connect heat dissipation hydraulic pump and heat dissipation motor, for according to engine start requirement control heat dissipation motor start-stop, for example, start-up delay 3s after heat dissipation motor can be started to realize satisfy engine no-load start requirement;Oil return switching valve group, connect heat dissipation motor, and have first solenoid valve, first solenoid valve connection and control heat dissipation motor oil return selectable direct delivery to hydraulic oil tank or into hydraulic oil cooler again delivery to hydraulic oil tank.The application can realize the effect of cooling oil, so that oil return has cooling effect, its structure is compact, small space occupation, and easy to maintain and layout.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic systems, and more particularly to a composite heat dissipation hydraulic oil temperature control system. BACKGROUND

[0002] The composite heat sink integrates the functions of water cooling, medium cooling and oil cooling, and can simultaneously cool the engine, engine intake and hydraulic oil of the hydraulic system, has the characteristics of compact structure, small size, simple layout design, low cost and easy maintenance, and is increasingly widely used in engineering machinery.

[0003] With the development of infrastructure towards high latitude and high altitude regions, the hydraulic system often needs to work below zero degrees, and the minimum temperature can even reach-60℃. In low temperature conditions, the viscosity of hydraulic oil increases sharply and the flowability becomes poor, which can easily lead to high differential pressure alarm of the filter element and damage of the hydraulic pump due to air suction.

[0004] Currently, the following methods can be used to adapt the hydraulic system to different environmental temperatures: using a preheating or warming device, such as a heater or hydraulic overflow heating, to heat the hydraulic oil to a reasonable range before starting the hydraulic system to work.

[0005] In the common structure, a separate controller needs to be provided on the hydraulic oil tank to connect the warming switch, temperature sensor signal and whole machine throttle input signal, and the output signal is connected to the electric proportional overflow valve to control the variable pump, and connected to the on-off valve to control the on-off of the working oil circuit and the return oil circuit. A gear pump is also needed in the system to provide oil source for the electric proportional valve, which has a complex structure and high cost.

[0006] In summary, how to use a hydraulic oil temperature control system with simple structure and low cost is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0007] Therefore, the purpose of the present application is to provide a composite heat dissipation hydraulic oil temperature control system, which has a simple structure, low cost and is easy to use and control.

[0008] In order to achieve the above purpose, the present application provides the following technical scheme:

[0009] A composite heat dissipation hydraulic oil temperature control system, comprising:

[0010] a hydraulic oil tank;

[0011] a heat dissipation hydraulic pump connected to the hydraulic oil tank and an electronically controlled engine, for supplying oil to the heat dissipation system; the electronically controlled engine controls the amount of oil drawn from and output by the heat dissipation hydraulic pump from the hydraulic oil tank;

[0012] a composite heat sink having a hydraulic oil cooler and a heat dissipation motor for cooling the engine and the hydraulic system;

[0013] a radiator driving valve group connected with the radiator hydraulic pump and the radiator motor, for controlling the start and stop of the radiator motor;

[0014] an oil return switching valve group connected with the radiator motor, and having a first electromagnetic valve connected with and controlling the oil return of the radiator motor, which is selectively directly delivered to the hydraulic oil tank or delivered to the hydraulic oil tank after passing through the hydraulic oil cooler.

[0015] Preferably, a working controller is further included, which is connected with the radiator driving valve group, the oil return switching valve group and the electronically controlled engine.

[0016] Preferably, the oil return switching valve group comprises a first cartridge valve and a second cartridge valve, both of which are connected with the oil outlet of the radiator motor in an on-off manner; the oil outlet of the first cartridge valve is connected with the oil inlet of the hydraulic oil cooler, and the oil outlet of the second cartridge valve is connected with the hydraulic oil tank.

[0017] The first electromagnetic valve is connected with the working controller, and connected with the first cartridge valve and the second cartridge valve.

[0018] Preferably, the hydraulic oil tank is connected with a working heating hydraulic pump, which is used for delivering the oil in the hydraulic oil tank to the working mechanism.

[0019] A working heating mode switching valve group is further included, which is connected with and controls the oil delivered by the working heating hydraulic pump to be supplied to the working mechanism or to be returned to the hydraulic oil tank through the overflow valve to increase the temperature of the oil in the hydraulic oil tank.

[0020] Preferably, the electronically controlled engine is connected with and controls the working heating hydraulic pump.

[0021] Preferably, the hydraulic oil tank is provided with a temperature sensor for detecting the temperature of the oil, which is connected with the working controller.

[0022] When the temperature of the hydraulic oil is lower than a preset temperature, the oil outlet of the radiator motor is returned to the hydraulic oil tank through the cartridge valve in the oil return switching valve group.

[0023] When the temperature of the hydraulic oil is higher than a preset temperature, the oil outlet of the radiator motor is returned to the hydraulic oil tank after being cooled in the hydraulic oil cooler, so as to decrease the temperature of the oil in the hydraulic oil tank.

[0024] Preferably, the working controller stores a first preset temperature, a second preset temperature, a third preset temperature and a fourth preset temperature, and the values of the first preset temperature, the second preset temperature, the third preset temperature and the fourth preset temperature increase in turn;

[0025] When the temperature sensor detects that the temperature is greater than the first preset temperature and less than the second preset temperature, the working controller controls the working heating mode switching valve group to be in the heating mode, so that the oil liquid output by the working heating hydraulic pump is overflowed to heat the return to the hydraulic oil tank;

[0026] When the temperature sensor detects that the temperature is greater than or equal to the second preset temperature, the working controller controls the working heating mode switching valve group to be in the working mode, so that the oil liquid output by the working heating hydraulic pump is to the working execution mechanism such as a hydraulic cylinder;

[0027] When the temperature sensor detects that the temperature is less than or equal to the third preset temperature, the oil return of the heat dissipation motor is directly transported to the hydraulic oil tank; when the temperature sensor detects that the temperature is greater than or equal to the fourth preset temperature, the working controller controls the first electromagnetic valve, so that the oil return of the heat dissipation motor enters the cooler and then is transported to the hydraulic oil tank.

[0028] Preferably, the hydraulic oil tank is provided with a hydraulic oil heater, and the hydraulic oil heater is connected to the working controller;

[0029] When the temperature sensor detects that the temperature is less than or equal to the first preset temperature, the hydraulic oil heater is turned on; when the temperature sensor detects that the temperature is greater than or equal to the second preset temperature, the hydraulic oil heater is turned off.

[0030] Preferably, a human-computer interaction interface is further included, and the human-computer interaction interface is connected to the working controller; when the working controller receives an opening signal sent by the human-computer interaction interface, the working controller controls the temperature sensor to cooperate with the radiator driving valve group, the oil return switching valve group and the electric control engine.

[0031] The first electromagnetic valve arranged in the oil return switching valve group is used to control whether the oil return passes through the hydraulic oil cooler, so that the cooling effect of the oil liquid is realized, so that the oil return has a cooling effect, and the composite radiator is used, which can be used for cooling the engine at the same time, and since the oil outlet of the radiator driving valve group is connected to the heat dissipation motor, the hydraulic oil in the hydraulic oil tank can also enter the composite radiator through the heat dissipation hydraulic pump and the radiator driving valve group, so that the cooling of the hydraulic oil in the hydraulic oil tank is realized. In addition, since the composite radiator is driven by hydraulic pressure, the structure is compact, the occupied space is small, and the maintenance and layout are easy. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim at the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0033] Figure 1 A schematic diagram of a composite heat dissipation hydraulic oil temperature control system provided by the present application.

[0034] Figure 1 In the drawings, the reference signs include:

[0035] Hydraulic oil tank 1, electronically controlled engine 2, heat dissipation hydraulic pump 3, working heating hydraulic pump 4, working heating mode switching valve group 5, radiator driving valve group 6, composite radiator 7, oil return switching valve group 8;

[0036] Temperature sensor 11, hydraulic oil heater 13;

[0037] Third electromagnetic valve 51, first overflow valve 52, second overflow valve 53;

[0038] Second electromagnetic valve 61, third overflow valve 62;

[0039] Hydraulic oil cooler 71, heat dissipation motor 72;

[0040] First electromagnetic valve 81, first plug-in valve 82, second plug-in valve 83. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0042] The core of the present application is to provide a composite heat dissipation hydraulic oil temperature control system, which has simple structure, low cost, and is easy to use and control.

[0043] Please refer to Figure 1 , Figure 1 A schematic diagram of a composite heat dissipation hydraulic oil temperature control system provided by the present application.

[0044] The application provides a composite heat dissipation hydraulic oil temperature control system, which mainly comprises a hydraulic oil tank 1, an electronically controlled engine 2, a heat dissipation hydraulic pump 3, a radiator driving valve group 6, a composite radiator 7 and an oil return switching valve group 8.

[0045] The hydraulic oil tank 1 is used for storing hydraulic oil, so as to supply oil to working mechanisms in the hydraulic oil temperature control system or external working mechanisms, and can have an oil outlet and an oil return port.

[0046] The heat dissipation hydraulic pump 3 is connected with the hydraulic oil tank 1 and the electronically controlled engine 2, and is used for supplying oil to the heat dissipation system; the electronically controlled engine 2 controls the amount of oil drawn from and output by the heat dissipation hydraulic pump 3 from the hydraulic oil tank 1. Optionally, the electronically controlled engine 2 can also be selected from other types of power devices.

[0047] The composite radiator 7 is used for connecting an oil return oil circuit of the hydraulic system, and comprises a hydraulic oil cooler 71 and a heat dissipation motor 72, which are used for cooling the engine and the hydraulic system; the hydraulic oil cooler is used for cooling the oil return of the oil return oil circuit of the hydraulic system, so that the hydraulic oil returned into the hydraulic oil tank 1 is cooled.

[0048] The radiator driving valve group 6 is connected with the heat dissipation hydraulic pump 3 and the heat dissipation motor 72, and is used for controlling the start and stop of the heat dissipation motor 72.

[0049] The oil return switching valve group 8 is connected with the heat dissipation motor 72, and comprises a first electromagnetic valve 81, which is connected with and controls the oil return of the heat dissipation motor 72, which can be selectively directly delivered to the hydraulic oil tank 1 or delivered to the hydraulic oil tank 1 after being delivered into the hydraulic oil cooler 71. It should be noted that the oil return switching valve group 8 can be provided with a plurality of valve bodies or valve groups, which realize different communication states under the control of the first electromagnetic valve 81, so that the oil return of the heat dissipation motor 72 can have two different oil return modes.

[0050] The composite radiator 7 is a liquid-driven radiator, which can realize change control of the hydraulic oil cooler 71 and the heat dissipation motor 72 through various state changes of the hydraulic system; the electronically controlled engine 2 controls the operation of the heat dissipation hydraulic pump 3, the heat dissipation hydraulic pump 3 provides hydraulic oil to the radiator driving valve group 6, and the radiator driving valve group 6 controls the start and stop of the hydraulic motor 72 in the composite radiator 7.

[0051] The oil outlet of the heat dissipation motor 72 is connected with the oil return switching valve group 8, and the oil return can be delivered into the oil return switching valve group 8; the oil return switching valve group 8 has the first electromagnetic valve 81, which is used for controlling the oil return circuit; the oil return circuit is divided into two kinds, one is the oil return tank after being cooled by the hydraulic oil cooler 71 in the composite radiator 7, and the other is the oil return tank after being directly delivered into the oil return switching valve group 8.

[0052] The application utilizes the first electromagnetic valve 81 arranged in the oil return switching valve group 8 to control whether the oil return passes through the hydraulic oil cooler 71, to realize the cooling effect of the oil, so that the oil return has the cooling effect and can switch whether to dissipate heat, thereby reducing energy loss. The composite radiator 7 is used in the application, which can be used for cooling the oil return of the engine, and can also make the hydraulic oil in the hydraulic oil tank 1 pass through the radiator driving valve group 6 and then enter the composite radiator 7, thereby realizing the cooling of the hydraulic oil in the hydraulic oil tank 1, because the composite radiator 7 is driven by hydraulic pressure, the structure is compact, the space occupied is small, and the composite radiator 7 is easy to maintain and layout; the hydraulic control mode is realized by using hydraulic elements, the structure is simple, and the cost is easy to control.

[0053] Optionally, the radiator driving valve group 6 is provided with a second electromagnetic valve 61, the second electromagnetic valve 61 controls the start and stop of the radiator motor 72 in the composite radiator 7, and the working logic of the second electromagnetic valve 61 is that the second electromagnetic valve 61 is powered after the electronic control engine 2 is started, so that the radiator motor 72 is kept in a continuous oil passing state through logic control.

[0054] On the basis of the above embodiment, the hydraulic oil temperature control system with composite heat dissipation further comprises a working controller connected with the radiator driving valve group 6, the oil return switching valve group 8 and the electronic control engine 2, that is, the control mode of the preset mode can be realized through automatic control, and the connection mode and control mode of each part are specifically introduced below.

[0055] On the basis, the oil return switching valve group 8 comprises a first cartridge valve 82 and a second cartridge valve 83, the oil inlet of the first cartridge valve 82 and the second cartridge valve 83 is connectable to the oil outlet of the radiator motor 72; the oil outlet of the first cartridge valve 82 is connected to the oil inlet of the hydraulic oil cooler 71, and the oil outlet of the second cartridge valve 83 is connected to the hydraulic oil tank.

[0056] The first electromagnetic valve 81 is connected with the working controller and connected with the first cartridge valve 82 and the second cartridge valve 83.

[0057] Specifically, the oil return switching valve group 8 comprises a first electromagnetic valve 81, a first cartridge valve 82 and a second cartridge valve 83, the first electromagnetic valve 81 is connected with the working controller and is used to obtain a control signal to realize the control of the first cartridge valve 82 and the second cartridge valve 83, the oil inlets of the first cartridge valve 82 and the second cartridge valve 83 are connected with the oil outlet of the radiator motor 72, that is, can receive the oil outlet of the radiator motor 72, the oil outlet of the first cartridge valve 82 is connected with the oil inlet of the hydraulic oil cooler 71, so that the oil outlet can be delivered to the hydraulic oil cooler 71, thereby realizing the cooling operation; the oil outlet of the second cartridge valve 83 is directly connected with the hydraulic oil tank 1, thereby realizing the direct oil return without cooling.

[0058] Generally, when the hydraulic oil temperature is low, the oil return of the oil outlet of the heat dissipation motor 72 is directly returned to the oil tank through the oil return switching valve group 8. The temperature information can be obtained externally by the sensor or by the working controller, and the control signal is sent directly to the first electromagnetic valve 81.

[0059] On the basis of any one of the above embodiments, the hydraulic oil tank 1 is connected to the working heating hydraulic pump 4, which is used to deliver the oil in the hydraulic oil tank 1 to the working mechanism;

[0060] It also includes a working heating mode switching valve group 5, which connects and controls the oil supply from the working heating hydraulic pump 4 to the working structure, or returns to the hydraulic oil tank 1 through the overflow valve 52 to heat the oil in the hydraulic oil tank 1.

[0061] The working mechanism provided in the present application can be an engine or other hydraulic oil power structure.

[0062] The working heating hydraulic pump 4 is connected to the working heating mode switching valve group 5, which can be selected by the third electromagnetic valve 51 in the working heating mode switching valve group 5, including two modes, one of which is to control the hydraulic oil to directly enter the multi-way valve body in the subsequent working mechanism, i.e. working mode; the other is to control the hydraulic oil to return to the hydraulic oil tank 1 after overflowing through the first overflow valve 52 in the working heating mode switching valve group 5, i.e. heating mode.

[0063] During the overflow process, the hydraulic oil output by the working heating hydraulic pump 4 can pass through the first overflow valve 52, so that the heat generated by the overflow can return to the hydraulic oil tank 1, thereby increasing the temperature of the hydraulic oil therein, and the hydraulic oil returned to the tank can be sucked into the working heating hydraulic pump 4 again, so that the overflow heating can be continuously performed, thereby achieving the effect of heating and warming up.

[0064] Optionally, the electronically controlled engine 2 is connected to and controls the working heating hydraulic pump 4.

[0065] Optionally, the third electromagnetic valve 51 in the above-mentioned working heating mode switching valve group 5 is connected to the working controller and can be controlled according to the output signal of the working controller to control the oil supply of the working heating pump 5 to overflow through the first overflow valve 52 and return to the oil tank for overflow heating of the system.

[0066] In the present embodiment, the overflow circulation method is used to heat the hydraulic oil in the hydraulic oil tank 1, and the control and maintenance of the oil temperature are realized.

[0067] On the basis of any one of the above embodiments, the hydraulic oil tank 1 is provided with a temperature sensor 11 for detecting the oil temperature, and the temperature sensor is connected to a working controller; when the hydraulic oil temperature is lower than a preset temperature, the oil outlet of the heat dissipation motor 72 returns to the hydraulic oil tank 1 through the oil return switching valve group 8.

[0068] When the hydraulic oil temperature is higher than the preset temperature, the oil outlet of the heat dissipation motor 72 enters the hydraulic oil cooler 71 through the cartridge valve 82 in the oil return switching valve group 8 for cooling and temperature reduction, and then returns to the hydraulic oil tank 1, so as to reduce the oil temperature in the hydraulic oil tank 1.

[0069] The temperature sensor 11 can be used to detect the hydraulic oil temperature in the hydraulic oil tank 1, or detect the oil temperature at the oil outlet and oil inlet of the hydraulic oil tank 1, and is not limited to a specific position. Different temperature control logic and modes can be set according to different detection positions.

[0070] Optionally, a hydraulic oil heater 13 is arranged in the hydraulic oil tank 1 for heating the hydraulic oil at extremely low temperature. According to whether the hydraulic oil heater 13 is equipped and whether the hydraulic oil electric heater can realize automatic control, three modes can be divided, including an electric heater automatic control type, an electric heater manual control type and a non-electric heater type. For different modes, the control mode and use mode of the working controller for each valve group are different.

[0071] In the present application, the composite heat sink 7 is driven by the heat sink driving valve group 6 to drive the heat dissipation motor 72 in the composite heat sink 7 to work, and the oil return switching valve group 8 controls the oil return route of the driving motor 72 to realize the cooling control of the hydraulic oil. The working heating mode switching valve group 5 and the hydraulic oil heater 13 in the hydraulic oil tank 1 can be used to realize the heating control of the system hydraulic oil. In addition, the above heating and cooling operations can be controlled in a targeted manner according to the temperature detected by the hydraulic oil temperature sensor 11.

[0072] In a specific embodiment, the working controller stores a first preset temperature T1, a second preset temperature T2, a third preset temperature T3 and a fourth preset temperature T4, and the values of the first preset temperature, the second preset temperature, the third preset temperature and the fourth preset temperature increase in turn, i.e. T1<T2<T3<T4. The number of temperature control preset values can be adjusted according to actual needs and control modes, for example, according to the type of oil product.

[0073] When the temperature sensor 11 detects that the temperature is greater than the first preset temperature and less than the second preset temperature, the working controller controls the working heating mode switching valve group 5 to be in the heating mode, so that the oil liquid output by the working heating hydraulic pump 4 is overflowed and returned to the hydraulic oil tank 1;

[0074] When the temperature sensor 11 detects that the temperature is greater than or equal to the second preset temperature, the working controller controls the working heating mode switching valve group 5 to be in the working mode, so that the oil output by the working heating hydraulic pump 4 is sent to the subsequent working actuators.

[0075] In a specific embodiment, the control mode of the working controller specifically includes: when the temperature sensor 11 detects that the temperature is less than or equal to the third preset temperature, the working controller controls the first electromagnetic valve 81, and the oil return of the heat dissipation motor 72 is directly sent to the hydraulic oil tank 1.

[0076] When the temperature sensor 11 detects that the temperature is greater than or equal to the fourth preset temperature, the oil return of the heat dissipation motor 72 is sent to the hydraulic oil cooler 71 and then to the hydraulic oil tank 1, until the hydraulic oil temperature drops below the third preset temperature.

[0077] On the basis of any one of the above embodiments, the hydraulic oil tank 1 is provided with a hydraulic oil heater 13 connected to the working controller; when the temperature sensor 11 detects that the temperature is less than or equal to the first preset temperature, the hydraulic oil heater 13 is turned on; when the temperature sensor 11 detects that the temperature is greater than or equal to the second preset temperature, the hydraulic oil heater 13 is turned off. In the hydraulic oil heater control logic, the trigger condition is hydraulic preheating enable.

[0078] On the basis of any one of the above embodiments, a human-machine interaction interface is further included, which is connected to the working controller, and when the working controller receives an opening signal sent by the human-machine interaction interface, the working controller controls the temperature sensor 11 to cooperate with the radiator driving valve group 6, the oil return switching valve group 8 and the electronically controlled engine 2 to work.

[0079] For the hydraulic oil temperature control system with composite heat dissipation provided with the temperature sensor 11, various different forms of control can be realized by cooperation of the sensor and the working controller. Generally, the human-machine interaction interface provided in the operating room of the whole machine can be a "hydraulic preheating" button. The temperature sensor 11 is connected to the working controller, and the hydraulic oil tank 1 does not need to be provided with a separate controller. The working controller can communicate with the ECU of the electronically controlled engine 2 through the CAN bus to start and stop the engine 2 and control the speed of the engine 2.

[0080] The operation process specifically includes the following steps:

[0081] Step S1, system power-on detection, the working controller controls the temperature sensor 11 to detect the current hydraulic oil temperature t in the hydraulic oil tank 1, if t

[0082] Step S2, the operator presses the "hydraulic preheat" button, triggers the hydraulic preheat function, until the temperature sensor 11 detects the current temperature t > T2, hydraulic preheat according to the three kinds of configuration of hydraulic oil electric heater has the following three program control logic.

[0083] Wherein, the system power on, the working controller and the ECU of the electronic control engine 2 establish communication, the working controller receives the "hydraulic preheat" button, hydraulic oil temperature sensor and other input signals, the working controller according to the hydraulic temperature sensor 11 detects the hydraulic oil temperature signal in the hydraulic oil tank 1, the working controller according to the control logic output control signal to the third electromagnetic valve 51, the second electromagnetic valve 61, the first electromagnetic valve 81, each oil circuit switching control, and through the CAN bus to the ECU system of the electronic control engine 2, control engine start-stop and speed.

[0084] Optionally, the "hydraulic preheat" button is a start-stop control button, the first press of the "hydraulic preheat" button will trigger the hydraulic preheat function, and the second press of the button will restore the normal working state.

[0085] The above three kinds of control logic specifically includes: electric heater automatic control type, electric heater manual control type and no electric heater type.

[0086] Wherein, the first kind of electric heater automatic control type control logic, when the detected current temperature t < T1, the working controller controls the engine 2 to be prohibited to start, and the hydraulic oil heater 13 is started, the hydraulic oil in the hydraulic oil tank 1 is heated by the hydraulic oil heater 13, when the t > T1 is detected in the process of continuous heating, the working controller starts the engine 2 to run at a fixed speed (such as 1000 rpm) by CAN bus, the third electromagnetic valve 51 is powered on, the working heating hydraulic pump 3 supplies oil through the first overflow valve 52 and is heated by overflow effect, and then directly returns to the hydraulic oil tank 1, the first electromagnetic valve 81 of the oil return switching valve group 8 is powered on, and the cooling motor 72 returns oil without cooling through the hydraulic oil radiator 71, the oil supply of the cooling hydraulic pump 3 passes through the cooling motor 72, and then directly returns to the oil tank through the plug-in valve 83 in the oil return switching valve group 8. When t ≥ T2, the third electromagnetic valve 51 in the working mode switching valve group 5 is de-energized to switch to the working mode, end the overflow heating, control the hydraulic oil heater 13 to be disconnected, exit the hydraulic preheat and turn to the normal working state; the engine idling standby operation. During the preheating process, other actuators of the system cannot act.

[0087] The second kind of electric heater manual control type control logic, the detected current temperature t < T1, manually connect the hydraulic oil heater 13, the electronic control engine 2 is prohibited to start;

[0088] When t≥T1, the working controller starts the electronically controlled engine 2 to run at a fixed speed (such as 1000 rpm) through the CAN bus, the third electromagnetic valve 51 in the working mode switching valve group 5 is powered to work in the overflow heating mode, the working heating hydraulic pump 4 supplies oil through the first overflow valve 52 to overflow and warm up directly back to the hydraulic oil tank 1, the first electromagnetic valve 81 in the oil return switching valve group 8 is powered, so that the cooling motor 72 returns oil without cooling through the radiator 71, and the cooling hydraulic pump 2 supplies oil through the cooling motor 72 and then directly back to the hydraulic oil tank through the second cartridge valve 83 in the oil return switching valve group 8.

[0089] When ≥T2, the third electromagnetic valve 51 in the working mode switching valve group 5 is powered off and switched to the working mode, ending the overflow heating, the hydraulic oil heater 13 is turned off, the hydraulic preheating is exited and the normal working state is converted; the engine is in idle standby operation. During the preheating process, other actuators of the system cannot be actuated.

[0090] In the third control logic of the type without the electric heater, when the detected current temperature t

[0091] When t>T1, the working controller starts the electronically controlled engine 2 to run at a fixed speed (such as 1000 rpm) through the CAN bus, the third electromagnetic valve 51 in the working mode switching valve group 5 is powered to work in the overflow heating mode, the working heating hydraulic pump 4 supplies oil through the first overflow valve 52 to overflow and warm up directly back to the hydraulic oil tank 1, the first electromagnetic valve 81 in the oil return switching valve group 8 is powered, so that the cooling motor 72 returns oil without cooling through the radiator 71, and the cooling hydraulic pump 2 supplies oil through the cooling motor 72 and then directly back to the hydraulic oil tank through the second cartridge valve 83 in the oil return switching valve group 8.

[0092] When ≥T2, the third electromagnetic valve 51 in the working mode switching valve group 5 is powered off and switched to the working mode, ending the overflow heating, the hydraulic oil heater 13 is turned off, the hydraulic preheating is exited and the normal working state is converted; the engine is in idle standby operation. During the preheating process, other actuators of the system cannot be actuated.

[0093] Optionally, the cooling hydraulic pump 3 and the working heating hydraulic pump 4 are gear pumps.

[0094] Optionally, the third electromagnetic valve 51, the second electromagnetic valve 61 and the first electromagnetic valve 81 are ordinary two-position four-way directional valves.

[0095] Optionally, the first overflow valve 52, the second overflow valve 53 and the third overflow valve 62 can be ordinary overflow valves.

[0096] Optionally, the first plug-in valve 82 and the second plug-in valve 83 are two-way plug-in valves.

[0097] The liquid-driven composite radiator 7 in the present application can also be replaced by an electric-driven composite radiator, and correspondingly, the radiator driving valve group needs to be replaced by an electric control element. The oil return switching valve group 8 can also be other switching valves, which switch whether the hydraulic system oil return passes through the composite radiator for heat dissipation according to the set temperature.

[0098] In addition to the main structure and connection relationship, operation method, etc. of the composite heat dissipation hydraulic oil temperature control system provided in each of the above embodiments, the structures of other parts of the composite heat dissipation hydraulic oil temperature control system refer to the prior art, and will not be described here.

[0099] Each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0100] The composite heat dissipation hydraulic oil temperature control system provided by the present application is described in detail above. The principle and implementation manner of the present application are described by applying specific examples in the present specification. The above embodiment description is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A composite heat dissipation hydraulic oil temperature control system, characterized in that, include: Hydraulic oil tank (1); A cooling hydraulic pump (3) is connected to the hydraulic oil tank (1) and the electronically controlled engine (2) for supplying oil to the cooling system; the electronically controlled engine (2) controls the amount of oil that the cooling hydraulic pump (3) draws from and outputs from the hydraulic oil tank (1); The composite radiator (7) has a hydraulic oil cooler (71) and a cooling motor (72) for cooling the hydraulic oil in the engine, hydraulic oil tank and hydraulic system; The radiator drive valve group (6) is connected to the cooling hydraulic pump (3) and the cooling motor (72) to control the start and stop of the cooling motor (72) so that the hydraulic oil in the hydraulic oil tank (1) enters the composite radiator (7) after passing through the cooling hydraulic pump (3) and the radiator drive valve group (6). The return oil switching valve group (8) is connected to the cooling motor (72) and has a first solenoid valve (81). The first solenoid valve (81) is connected to and controls the return oil of the cooling motor (72) to be either directly delivered to the hydraulic oil tank (1) or delivered to the hydraulic oil cooler (71) and then delivered to the hydraulic oil tank (1). It also includes a working controller, which is connected to the radiator drive valve group (6), the oil return switching valve group (8) and the electronically controlled engine (2). The return oil switching valve group (8) includes a first cartridge valve (82) and a second cartridge valve (83). The oil inlets of the first cartridge valve (82) and the second cartridge valve (83) can be switched on and off to the oil outlet of the cooling motor (72). The oil outlet of the first cartridge valve (82) is connected to the oil inlet of the hydraulic oil cooler (71), and the oil outlet of the second cartridge valve (83) is connected to the hydraulic oil tank. The first solenoid valve (81) is connected to the working controller and to the first cartridge valve (82) and the second cartridge valve (83).

2. The hydraulic oil temperature control system with composite heat dissipation according to claim 1, characterized in that, The hydraulic oil tank (1) is connected to the working heating hydraulic pump (4), which is used to transport the oil from the hydraulic oil tank (1) to the working mechanism. It also includes a working heating mode switching valve group (5), which connects to and controls the oil output by the working heating hydraulic pump (4) to supply oil to the working structure or to overflow and return to the hydraulic oil tank (1) through the overflow valve (52) to raise the temperature of the oil in the hydraulic oil tank (1).

3. The hydraulic oil temperature control system with composite heat dissipation according to claim 2, characterized in that, The electronically controlled engine (2) is connected to and controls the working heating hydraulic pump (4).

4. The hydraulic oil temperature control system with composite heat dissipation according to claim 2, characterized in that, The hydraulic oil tank (1) is equipped with a temperature sensor (11) for detecting oil temperature, and the temperature sensor is connected to the working controller; When the hydraulic oil temperature is lower than the preset temperature, the oil output from the cooling motor (72) returns to the hydraulic oil tank (1) through the second cartridge valve (83) in the return oil switching valve group (8). When the hydraulic oil temperature is higher than the preset temperature, the oil output from the cooling motor (72) enters the hydraulic oil cooler (71) through the first cartridge valve (82) in the return oil switching valve group (8) to cool down and then return to the hydraulic oil tank (1), so as to reduce the oil temperature in the hydraulic oil tank (1).

5. The hydraulic oil temperature control system with composite heat dissipation according to claim 4, characterized in that, The working controller stores a first preset temperature, a second preset temperature, a third preset temperature, and a fourth preset temperature, the values ​​of which increase sequentially. When the temperature sensor (11) detects that the temperature is greater than the first preset temperature and less than the second preset temperature, the working controller controls the working heating mode switching valve group (5) to be in heating mode so that the oil output by the working heating hydraulic pump (4) overflows and returns to the hydraulic oil tank (1). When the temperature sensor (11) detects that the temperature is greater than or equal to the second preset temperature, the working controller controls the working heating mode switching valve group (5) to be in working mode so that the oil output by the working heating hydraulic pump (4) is sent to the working actuators such as the hydraulic cylinder. When the temperature sensor (11) detects that the temperature is less than or equal to the third preset temperature, the return oil of the cooling motor (72) is directly delivered to the hydraulic oil tank (1); when the temperature sensor (11) detects that the temperature is greater than or equal to the fourth preset temperature, the working controller controls the first solenoid valve (81) so that the return oil of the cooling motor (72) enters the cooler (71) and is then delivered to the hydraulic oil tank (1).

6. The hydraulic oil temperature control system with composite heat dissipation according to claim 5, characterized in that, The hydraulic oil tank (1) is equipped with a hydraulic oil heater (13), and the hydraulic oil heater (13) is connected to the working controller; When the temperature sensor (11) detects a temperature less than or equal to the first preset temperature, the hydraulic oil heater (13) is turned on; when the temperature sensor (11) detects a temperature greater than or equal to the second preset temperature, the hydraulic oil heater (13) is turned off.

7. The hydraulic oil temperature control system with composite heat dissipation according to any one of claims 4 to 6, characterized in that, It also includes a human-machine interface, which is connected to the working controller. When the working controller receives the start signal sent by the human-machine interface, the working controller controls the temperature sensor (11) to work in conjunction with the radiator drive valve group (6), the oil return switching valve group (8) and the electronically controlled engine (2).

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