Hydraulic oil temperature control system and concrete mechanical equipment

Abstract

The utility model discloses a hydraulic oil temperature control system and concrete mechanical equipment in the technical field of engineering machinery, and aims to solve the heat dissipation problem of an existing hydraulic system. The first oil supply path and the first oil return path are arranged on a hydraulic oil tank provided with an oil temperature sensor and are respectively connected with a main system; a second oil supply path on the hydraulic oil tank is connected to the hydraulic oil tank through an execution motor, a first electromagnetic valve and a hydraulic oil cooler in sequence; a first oil return path in the buffer device is communicated with the cartridge valve through a third oil supply path; the cartridge valve converges into the second oil supply path through a third oil return path and is jointly communicated with the hydraulic oil cooler; the second electromagnetic valve and the energy accumulator are communicated and converged to a third oil return path, the second electromagnetic valve is communicated to an inlet of the first oil supply path through a fourth oil supply path, and the second electromagnetic valve is connected with the cartridge valve; the signal output end of the oil temperature sensor and the control ends of the first electromagnetic valve and the second electromagnetic valve are respectively connected with the controller; the utility model is used for a hydraulic system, prolongs the service life of the whole machine and realizes heat balance of the hydraulic system.

Description

Technical Field

[0001] The utility model relates to a hydraulic oil temperature control system and concrete mechanical equipment, belonging to the technical field of engineering machinery. Background Art

[0002] Concrete machinery is a highly efficient concrete pumping equipment, which mainly uses a high-power hydraulic system to transmit energy. In this process, the thermal balance effect of the hydraulic system has always been the core indicator of concrete machinery. Ambient temperature is an important factor affecting the thermal balance of the hydraulic system of the whole machine. When the ambient temperature is too low and the hydraulic oil temperature is lower than the lowest set temperature for a long time, it is not conducive to the operation of the oil pump and radiator; when the ambient temperature is very high and the thermal balance temperature of the hydraulic system is higher than the highest set temperature, the leakage value of the hydraulic components increases, reducing their lifespan and causing the system to shut down.

[0003] For example, the patent with application number CN216867128U describes that the radiator oil source comes from the T circuit of the main valve. In order to make part of the hydraulic oil in the T circuit flow to the hydraulic oil radiator, a one-way valve (pressure loss) needs to be added to the T circuit. Therefore, this solution is achieved by additionally increasing the circuit pressure loss, which is not conducive to energy saving and consumption reduction. When the ambient temperature is low, the hydraulic system oil temperature fails to reach the appropriate temperature, the radiator pressure loss will increase significantly, and the radiator is at risk of damage. Once the radiator is damaged, it must be shut down for maintenance, which seriously affects the operation of the pump truck. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a hydraulic oil temperature control system and concrete machinery equipment, which can dissipate heat to the hydraulic oil cooler through the control system to achieve thermal balance of the hydraulic system, and alleviate the impact force on the hydraulic oil cooler during the heat dissipation process by adding a buffer device, thereby delaying the service life of the hydraulic oil cooler.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] The utility model provides a hydraulic oil temperature control system, comprising a hydraulic oil tank provided with an oil temperature sensor, a buffer device and a controller; a first oil supply circuit and a first oil return circuit on the hydraulic oil tank are respectively connected to a main system; the hydraulic oil flows back to the hydraulic oil tank through a second oil supply circuit on the hydraulic oil tank, an actuator motor, a first solenoid valve and a hydraulic oil cooler in sequence; the first solenoid valve is connected to the hydraulic oil tank;

[0007] The buffer device includes a second solenoid valve, a cartridge valve and an accumulator; the first oil return circuit is connected to the oil inlet of the cartridge valve through a third oil supply circuit; the oil return port of the cartridge valve is connected to the second oil supply circuit through the third oil return circuit and is connected to the hydraulic oil cooler; the first oil inlet of the second solenoid valve and the oil port of the accumulator are connected and connected to the third oil return circuit, the second oil inlet is connected to the entrance of the first oil supply circuit through a fourth oil supply circuit, and the oil outlet of the second solenoid valve is connected to the control port of the cartridge valve; the signal output end of the oil temperature sensor and the control ends of the first solenoid valve and the second solenoid valve are respectively connected to the controller

[0008] Furthermore, the main system includes a main valve and a main system actuator, and the first oil supply circuit is connected in sequence through the main valve and the main system actuator; the first oil return circuit is connected to the hydraulic oil tank in sequence through the main system actuator and the main valve.

[0009] Furthermore, the main valve includes a first valve core and a second valve core; the third oil supply path is connected to the first oil return path between the first valve core and the second valve core.

[0010] Furthermore, it also includes a power unit; the power unit includes a main pump and a first gear pump connected to the engine in sequence; the main pump is connected between the main system and the hydraulic oil tank through the first oil supply line; the first gear pump is connected between the actuator motor and the hydraulic oil tank through the second oil supply line.

[0011] Furthermore, the power unit is also provided with a second gear pump; the fifth oil supply line provided on the hydraulic oil tank is connected to the second oil supply line between the first solenoid valve and the hydraulic oil cooler; and the second gear pump is arranged on the fifth oil supply line.

[0012] Furthermore, the power unit is also provided with a second gear pump; the fifth oil supply line provided on the hydraulic oil tank is connected to the second oil supply line between the first solenoid valve and the hydraulic oil cooler; and the second gear pump is arranged on the fifth oil supply line.

[0013] Furthermore, the hydraulic oil cooler includes a radiator and a cooling fan which are arranged opposite to each other; the radiator is connected to the outlet end of the second oil supply circuit; and the cooling fan is connected to the engine.

[0014] The present application provides a concrete mechanical equipment, comprising any of the hydraulic oil temperature control systems described above.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides a hydraulic oil temperature control system, which controls the return oil to dissipate heat appropriately through the hydraulic oil cooler according to the actual real-time temperature of the hydraulic oil circuit by the cooperation of a buffer device, an oil temperature sensor, a controller and a hydraulic oil cooler, thereby achieving thermal balance of the hydraulic system, and by adding a buffer device to alleviate the impact force on the hydraulic oil cooler during the heat dissipation process, the service life of the hydraulic oil cooler is delayed. Among them, when the high-pressure oil discharged from the first return oil circuit is discharged through the third oil supply circuit through the cartridge valve, the high-pressure oil is buffered through the third return oil circuit and the accumulator, so as to avoid the high-pressure oil directly flowing into the second oil supply circuit through the third return oil circuit to generate a large impact force on the hydraulic oil cooler; the second solenoid valve is connected to the third return oil circuit, and is used to allow the high-pressure oil to smoothly enter and discharge the cartridge valve from the first return oil circuit, thereby improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the heat balance principle structure of a hydraulic oil temperature control system provided by the utility model;

[0018] Figure 2 It is the layout diagram of the components and pipelines of the whole machine;

[0019] In the figure: 1. Hydraulic oil cooler; 2. Power unit; 3. Main valve; 4. Main system actuator; 5. Actuator motor; 6. Hydraulic oil tank; 7. First solenoid valve; 8. Buffer device; 9. Oil temperature sensor;

[0020] 11. Radiator; 12. Cooling fan;

[0021] 21. Engine; 22. Main pump; 23. First gear pump; 24. Second gear pump; 25. First oil supply line; 26. First oil return line; 27. Second oil supply line; 28. Fifth oil supply line;

[0022] 31. first valve core; 32. second valve core;

[0023] 81. Second solenoid valve; 82. Cartridge valve; 83. Accumulator; 84. Third oil supply line; 85. Fourth oil supply line. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0025] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] Embodiment 1:

[0028] See also Figure 1 to Figure 2 , this embodiment provides a hydraulic oil temperature control system, including a hydraulic oil tank 6, a buffer device 8 and a controller; an oil temperature sensor 9 is installed on the hydraulic oil tank 6. The hydraulic oil tank 6 is connected to the main system through the first oil supply line 25, and is used to supply oil to the main system through the first oil supply line 25. The hydraulic oil tank 6 is connected to the main system through the second oil supply line 27, so that the high-pressure oil discharged from the main system is discharged into the hydraulic oil tank 6 through the second oil supply line 27. The hydraulic oil flows back to the hydraulic oil tank 6 through the second oil supply line 27 on the hydraulic oil tank 6 through the actuator motor 5, the first solenoid valve 7 and the hydraulic oil cooler 1 in sequence. That is, the oil outlet and the oil return port of the second oil supply line 27 are respectively connected to the hydraulic oil tank 6, and the oil outlet of the second hydraulic oil circuit is connected to the actuator motor 5, the first solenoid valve 7 and the hydraulic oil cooler 1 in sequence. The first solenoid valve 7 is connected to the hydraulic oil tank 6, that is, one of the oil outlets of the first solenoid valve 7 is connected to the hydraulic oil tank 6.

[0029] The buffer device 8 includes a second solenoid valve 81, a cartridge valve 82 and an accumulator 83. The installation method is as follows: the oil inlet of the cartridge valve 82 is connected to the first oil return line 26 through the third oil supply line 84. The oil return line of the cartridge valve 82 is connected to the second oil supply line 27 through the third oil return line, and is connected to the hydraulic oil cooler 1 with the second oil supply line 27. The first oil inlet on the second solenoid valve 81 is connected to the oil port of the accumulator 83 and is jointly connected to the third oil return line, and the second oil port of the second solenoid valve 81 is connected to the entrance of the first oil supply line 25 through the fourth oil supply line 85. The oil outlet of the second solenoid valve 81 is connected to the control port of the cartridge valve 82. That is, the control port on the cartridge valve 82 is connected to the oil outlet of the second solenoid valve 81. The signal output end of the oil temperature sensor 9 and the control ends of the first solenoid valve 7 and the second solenoid valve 81 are respectively connected to the controller. Both the first solenoid valve 7 and the second solenoid valve 81 can adopt two-position three-way solenoid valves.

[0030] Optionally, the main system includes a main valve 3 and a main system actuator 4. The main valve 3 is an existing product. The first oil supply circuit 25 is connected to the main system actuator 4 in sequence through the main valve 3, and the first oil return circuit 26 is connected to the hydraulic oil tank 6 through the main system actuator 4 and the main valve 3 in sequence. After the high-pressure oil enters the main valve 3 and the main system actuator 4 through the first oil supply circuit 25 and is discharged from the first oil return circuit 26, the main system actuator 4 is driven. The main valve 3 includes a first valve core 31 and a second valve core 32. One end of the third oil supply circuit 84 is connected to the first oil return circuit 26 between the first valve core 31 and the second valve core 32 to avoid excessive pressure of the high-pressure oil released through the main system actuator 4, so that the high-pressure oil entering the third oil supply circuit 84 has a greater impact on the cartridge valve 82 and the accumulator 83; or the pressure is too low, and the high-pressure oil entering the third oil supply circuit 84 cannot lift the cartridge block in the cartridge to achieve a buffering function.

[0031] Optionally, the hydraulic oil temperature control system includes a power unit 2. The power unit 2 includes an engine 21, a main pump 22 and a first gear pump 23. The engine 21 is connected to the main pump 22 and the first gear pump 23 in sequence to provide power support for the main pump 22 and the first gear pump 23. The main pump 22 is installed on the first oil supply line 25 between the main system and the hydraulic oil tank 6 to provide oil supply power for the first oil supply line 25. The first gear pump 23 is installed on the second oil supply line 27 between the actuator motor 5 and the hydraulic oil tank 6 to provide oil supply power for the second oil supply line 27.

[0032] The hydraulic cooler includes a radiator 11 and a cooling fan 12. The radiator 11 is installed at the outlet of the second oil supply line 27, and the high-pressure oil returned from the outlet of the second oil supply line 27 is heat-dissipated by the radiator 11. The cooling fan 12 is arranged relative to the radiator 11 and is powered by the engine 21.

[0033] Among them, combined with the actual specific environment to set the oil temperature and the relationship table between the solenoid valve operation and the oil temperature below, the working control mode of the hydraulic oil temperature control system is:

[0034]

[0035] Working condition 1: When the oil temperature sensor 9 detects that the oil temperature is less than t1, the first solenoid valve 7 works, its indicator light is on, and the working state of the first solenoid valve 7 is in the cross position. The high-pressure oil pumped out by the first gear pump 23 through the second oil supply line 27 directly returns to the hydraulic oil tank 6 after passing through the actuator motor 5 and the first solenoid valve 7. At the same time, the second solenoid valve 81 works, its indicator light is on, the fourth oil supply line 85 flows into the high-pressure control oil, the working state of the second solenoid valve 81 is 1 through 3, the cartridge valve 82 is closed, and no hydraulic oil flows out of the third oil supply line 84 (the buffer device 8 does not discharge high-pressure oil to the second oil supply line 27). No hydraulic oil flows through the radiator 11, and the cooling system is in the closed state. When the oil temperature is less than t1, the viscosity of the hydraulic oil is very high, and the resistance of the hydraulic oil passing through the radiator 11 is very large. Preventing the hydraulic oil from flowing into the radiator 11 can protect the radiator 11 and extend its service life. At the same time, the hydraulic oil temperature can be quickly raised to a suitable temperature to maintain the efficient operation of the entire hydraulic system.

[0036] Working condition 2: when the oil temperature sensor detects that the oil temperature is ≥ t1 and < t2, the first solenoid valve 7 does not work (the indicator light is off), the working state of the first solenoid valve 7 is in the middle position (parallel position), and the high-pressure oil pumped out by the first gear pump 23 enters the radiator 11 through the second oil supply line 27, the actuator motor 5, and the first solenoid valve 7. At the same time, the second solenoid valve 81 works (the indicator light is on), the fourth oil supply line 85 flows into the high-pressure control oil, the working state of the second solenoid valve 81 is 1 through 3, the cartridge valve 82 is closed, and no hydraulic oil flows out of the third oil supply line 84 and is discharged from the second oil supply line 27. The hydraulic oil discharged from the second oil supply line 27 in the radiator 11, at this time, the cooling system is in the open state. At this time, the whole machine works under the condition of suitable ambient temperature, low pumping power, small heat generation of the hydraulic system, and moderate thermal equilibrium temperature. The heat dissipation capacity of working condition 2 can meet the needs of the whole machine.

[0037] Working condition three, when the oil temperature sensor detects that the oil temperature is ≥ t2, the first solenoid valve 7 does not work (the indicator light is off), the working state of the first solenoid valve 7 is in the middle position (parallel position), and the high-pressure oil pumped out by the first gear pump 23 enters the hydraulic oil cooler 1 through the second oil supply line 27, the actuator motor 5, and the first solenoid valve 7. At the same time, the second solenoid valve 81 does not work (the indicator light is off), and the working state of the second solenoid valve 81 is 1-through-2, and the high-pressure control oil flows into the cartridge valve 82 through the first return oil line 26 and the third oil supply line 84 on the main valve 3. The cartridge valve 82 opens and enters the radiator 11 through the oil outlet of the third oil supply line 84. Because the return oil of the main valve 3 has periodic impacts, the accumulator 83 can absorb the impact well, so that the impact of the hydraulic oil flowing out of the third oil supply line 84 is minimized, and the radiator 11 is protected. Working condition three is applicable to the whole machine working under the condition of high ambient temperature, high pumping power, large heat generation of the hydraulic system, and high thermal balance temperature. The heat dissipation system works at maximum power to maintain the thermal balance of the hydraulic system. When the hydraulic oil temperature control system is working, the hydraulic oil flow condition three in the radiator 11 is greater than the condition two, and the heat dissipation power condition three is greater than the condition two. Therefore, the heat dissipation effect condition three is the best. In addition, a second gear pump 24 is also provided on the power unit 2, and the fifth oil supply line 28 provided on the hydraulic oil tank 6 is connected to the second oil supply line 27 between the first solenoid valve 7 and the hydraulic oil cooler 1. The second gear pump 24 is installed on the fifth oil supply line 28 to provide oil supply power for the fifth oil supply line 28. The main engine manufacturer can choose to retain one of the buffer device 8 and the second gear pump 24 according to the different climates of the customer's location and meet the working conditions, so as to reduce the design cost; or according to actual needs, the buffer device 8 and the second gear pump 24 can be retained at the same time to meet the working conditions.

[0038] Embodiment 2:

[0039] This embodiment provides a concrete machinery and equipment, including a hydraulic oil temperature control system as described in any one of the above-mentioned embodiments. Since the concrete machinery and equipment provided by this embodiment adopts the hydraulic oil temperature control system described in embodiment one, it can at least produce the technical effect described in embodiment one, and will not be elaborated here.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic oil temperature control system, It is characterized in that It comprises a hydraulic oil tank provided with an oil temperature sensor, a buffer device and a controller; the first oil supply circuit and the first oil return circuit on the hydraulic oil tank are respectively connected to the main system; the hydraulic oil flows back to the hydraulic oil tank through the second oil supply circuit on the hydraulic oil tank, the actuator motor, the first solenoid valve and the hydraulic oil cooler in sequence; the first solenoid valve is connected to the hydraulic oil tank; The buffer device includes a second solenoid valve, a cartridge valve and an accumulator; the first oil return circuit is connected to the oil inlet of the cartridge valve through a third oil supply circuit; the oil return port of the cartridge valve is merged into the second oil supply circuit through the third oil return circuit and is jointly connected to the hydraulic oil cooler; the first oil inlet of the second solenoid valve and the oil port of the accumulator are connected and merged into the third oil return circuit, the second oil inlet is connected to the entrance of the first oil supply circuit through a fourth oil supply circuit, and the oil outlet of the second solenoid valve is connected to the control port of the cartridge valve; the signal output end of the oil temperature sensor and the control ends of the first solenoid valve and the second solenoid valve are respectively connected to the controller.

2. The hydraulic oil temperature control system according to claim 1, It is characterized in that The main system includes a main valve and a main system actuator; the first oil supply circuit is connected in sequence through the main valve and the main system actuator; the first oil return circuit is connected to the hydraulic oil tank in sequence through the main system actuator and the main valve.

3. The hydraulic oil temperature control system according to claim 2, It is characterized in that The main valve comprises a first valve core and a second valve core; the third oil supply path is connected to the first oil return path between the first valve core and the second valve core.

4. The hydraulic oil temperature control system according to claim 1, It is characterized in that It also includes a power device; the power device includes a main pump and a first gear pump connected to the engine in sequence; the main pump is connected between the main system and the hydraulic oil tank through the first oil supply line; the first gear pump is connected between the actuator motor and the hydraulic oil tank through the second oil supply line.

5. The hydraulic oil temperature control system according to claim 4, It is characterized in that The power unit is also provided with a second gear pump; the fifth oil supply path provided on the hydraulic oil tank is connected to the second oil supply path between the first solenoid valve and the hydraulic oil cooler; the second gear pump is arranged on the fifth oil supply path.

6. The hydraulic oil temperature control system according to claim 4, It is characterized in that The hydraulic oil cooler comprises a radiator and a cooling fan which are arranged opposite to each other; the radiator is connected to the outlet end of the second oil supply path; and the cooling fan is connected to the engine.

7. A concrete mechanical equipment, It is characterized in that It comprises a hydraulic oil temperature control system as described in any one of claims 1 to 6.

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