Energy recycling system of mining dump truck

Abstract

The invention discloses an energy recycling system of a mining dump truck, and relates to the technical field of mining dump trucks. The energy recycling system of the mining dump truck comprises an energy accumulator, an energy recycling valve bank, a heat balance oil way, an energy recycling oil way and a proportion adjusting valve, an oil inlet of the energy recycling valve bank is communicated with the rodless cavity, and an oil outlet of the energy recycling valve bank can be communicated with an oil inlet and an oil outlet of the energy accumulator. The radiator is arranged on the heat balance oil way. A hydraulic motor is arranged on the energy recycling oil way and mechanically connected with the cooling fan. An oil inlet of the heat balance oil way and an oil inlet of the energy recycling oil way are both communicated with an oil inlet and an oil outlet of the energy accumulator, and an oil outlet of the heat balance oil way and an oil outlet of the energy recycling oil way are both communicated with the oil tank. The proportioning valve is arranged on the heat balance oil way and used for adjusting the flow of the hydraulic oil in the energy accumulator entering the heat balance oil way. According to the energy recycling system of the mining dump truck, system energy consumption is reduced, and heat balance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mining dump trucks, and in particular to an energy recovery and utilization system of a mining dump truck. Background Art

[0002] Mining dump trucks generally use hydraulic cylinders to lift the carriage. When the carriage is lifted, the lifting cylinder overcomes the weight of the carriage and the weight of the loaded materials, and converts most of the hydraulic energy driven by the hydraulic pump into the gravitational potential energy of the load. This part is effective work, and another small part of the hydraulic energy is converted into heat due to throttling loss, which increases the oil temperature. When the carriage is lowered, the loaded materials have been unloaded, and the gravitational potential energy of the carriage's own weight is converted into hydraulic energy through the hydraulic cylinder, and then converted into heat through the throttling of the control valve, causing energy loss and rapidly increasing the temperature of the hydraulic oil. A special cooling device is required to cool the hydraulic oil, further increasing the energy consumption and complexity of the system.

[0003] The energy recovery and utilization system of a mining dump truck in the prior art recovers the potential energy of the carriage through an accumulator, and uses the hydraulic oil in the accumulator to drive a hydraulic motor to drive a fan to rotate, thereby cooling the system. However, the energy saving and heat dissipation effects are poor. Summary of the invention

[0004] The object of the present invention is to provide an energy recovery and utilization system for a mining dump truck, so as to achieve thermal balance of the system and reduce energy consumption of the system.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An energy recovery and utilization system for a mining dump truck, the mining dump truck comprising a lifting cylinder and a heat dissipation device, the lifting cylinder comprising a rodless cavity and a rod cavity, the heat dissipation device comprising a radiator and a heat dissipation fan, the radiator being used to dissipate the heat of hydraulic oil flowing out of the rodless cavity, and the heat dissipation fan being used to dissipate the heat of the radiator; the energy recovery and utilization system comprising:

[0007] Accumulator;

[0008] An energy recovery valve group, wherein the oil inlet of the energy recovery valve group is communicated with the rodless chamber, and the oil outlet of the energy recovery valve group can be communicated with the oil inlet and outlet of the accumulator;

[0009] A heat balance oil circuit, wherein the radiator is arranged on the heat balance oil circuit;

[0010] An energy recovery oil circuit, wherein a hydraulic motor is provided on the energy recovery oil circuit, and the hydraulic motor is mechanically connected to the cooling fan;

[0011] The oil inlet of the heat balance oil circuit and the oil inlet of the energy recovery oil circuit are both connected to the oil inlet and outlet of the accumulator, and the oil outlet of the heat balance oil circuit and the oil outlet of the energy recovery oil circuit are both connected to the oil tank;

[0012] A proportional regulating valve is arranged on the thermal balance oil circuit and is used for regulating the flow rate of the hydraulic oil in the accumulator entering the thermal balance oil circuit.

[0013] As an optional solution of the energy recovery and utilization system of the mining dump truck, the energy recovery valve group includes a floating solenoid valve, and the floating solenoid valve is used to control the communication between the rodless chamber and the inlet and outlet oil ports of the accumulator.

[0014] As an optional solution of the energy recovery and utilization system of the mining dump truck, the energy recovery valve group also includes a cover valve, the floating solenoid valve is used to control the connection between the control oil port of the cover valve and the oil tank, the oil inlet of the cover valve is connected to the rodless chamber, and the oil outlet of the cover valve can be connected to the oil inlet and outlet of the accumulator.

[0015] As an optional solution of the energy recovery and utilization system of the mining dump truck, the energy recovery valve group further includes a reversing valve, the oil inlet of the reversing valve is connected to the oil outlet of the cover valve, the first working oil port of the reversing valve is connected to the oil inlet and outlet of the accumulator, and the second working oil port of the reversing valve is connected to the oil tank;

[0016] When the pressure of the oil outlet of the cover valve is greater than or equal to the set pressure, the oil inlet of the reversing valve is connected to the first working oil port of the reversing valve; when the pressure of the oil outlet of the cover valve is less than the set pressure, the oil inlet of the reversing valve is connected to the second working oil port of the reversing valve.

[0017] As an optional solution for the energy recovery and utilization system of the mining dump truck, a first one-way valve is provided between the first working oil port of the reversing valve and the inlet and outlet oil ports of the accumulator, and the first one-way valve is used for one-way conduction between the first working oil port of the reversing valve and the inlet and outlet oil ports of the accumulator.

[0018] As an optional solution of the energy recovery and utilization system of the mining dump truck, the oil outlet of the cover valve can also be connected to the rod chamber, and a second one-way valve is arranged between the rod chamber and the oil outlet of the cover valve, and the second one-way valve is used for one-way conduction of the oil outlet of the cover valve to the rod chamber.

[0019] As an optional solution of the energy recovery system of the mining dump truck, a throttle valve is further provided between the oil inlet and outlet of the accumulator and the oil inlet of the heat balance oil circuit and the oil inlet of the energy recovery oil circuit.

[0020] As an optional solution of the energy recovery and utilization system of the mining dump truck, a bypass one-way valve is further provided in the heat balance oil circuit, and the bypass one-way valve is connected in parallel with the radiator.

[0021] As an optional solution of the energy recovery and utilization system of the mining dump truck, the oil inlet and outlet of the accumulator are provided with pressure sensors, and the pressure sensors are used to detect the pressure of the oil inlet and outlet of the accumulator.

[0022] As an optional solution of the energy recovery and utilization system of the mining dump truck, the oil inlet and outlet of the accumulator are provided with temperature sensors, and the temperature sensors are used to detect the temperature of the hydraulic oil in the accumulator.

[0023] Beneficial effects of the present invention:

[0024] The energy recovery and utilization system of a mining dump truck provided by the present invention controls the oil inlet and outlet of the accumulator to be connected with the rodless chamber of the lifting cylinder through the energy recovery valve group, so that when the car body is lowered, the hydraulic oil of the rodless chamber of the lifting cylinder is controlled to be recovered into the accumulator, and the hydraulic oil of the accumulator can enter the heat balance oil circuit and the energy recovery and utilization oil circuit, and the hydraulic oil entering the heat balance oil circuit returns to the oil tank after being cooled by the radiator; at the same time, the hydraulic oil in the energy recovery and utilization oil circuit drives the hydraulic motor to rotate to drive the cooling fan to work, and the cooling fan cools the radiator, so that the hydraulic oil recovered in the accumulator is used to provide power for the hydraulic motor, and the cooling fan is driven to cool the system hydraulic oil, and there is no need to add an additional driving part to drive the cooling fan to cool the hydraulic oil, so that the energy recovery of the gravitational potential energy of the car body is realized, and the recovered energy is used for system heat dissipation and cooling. The hydraulic oil entering the heat balance oil circuit is adjusted by a proportional regulating valve, so that the flow rate of the hydraulic oil cooled by the radiator changes with the change of the energy recovered in the accumulator, so as to improve the utilization rate of the recovered energy of the accumulator; the converted heat dissipation power is used to reduce the temperature of the system hydraulic oil, and thermal balance is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a hydraulic control schematic diagram of a mining dump truck provided in an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Lifting cylinder; 2. Accumulator; 3. Energy recovery valve group; 4. Heat balance oil circuit; 5. Energy recovery oil circuit; 6. Proportional control valve; 7. Pressure sensor; 8. Temperature sensor; 9. Controller; 10. Oil tank; 11. Hydraulic pump; 12. Filter; 13. Lifting valve; 14. Balance valve;

[0028] 3.1. Floating solenoid valve; 3.2. Cover valve; 3.3. Reversing valve; 3.4. First non-return valve; 3.5. Second non-return valve; 3.6. Throttle valve; 4.1. Radiator; 4.2. Bypass non-return valve; 5.1. Hydraulic motor; 5.2. Cooling fan. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "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 invention 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0031] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] like Figure 1 As shown, the mining dump truck includes a lifting cylinder 1 and a heat dissipation device. The lifting cylinder 1 includes a rodless cavity and a rod cavity. The heat dissipation device includes a radiator 4.1 and a heat dissipation fan 5.2. The radiator 4.1 is used to dissipate the hydraulic oil flowing out of the rodless cavity, and the heat dissipation fan 5.2 is used to dissipate the heat of the radiator 4.1. The hydraulic control system of the mining dump truck includes a hydraulic pump 11, a filter 12, a lifting valve 13 and a balance valve 14. The hydraulic pump 11 provides a pressure oil source for the system. After the hydraulic pump 11 sucks oil from the oil tank 10, the oil enters the lifting valve 13 after filtering the impurities in the hydraulic oil through the filter 12. The lifting valve 13 includes a three-position reversing valve and a relief valve to realize the three functions of "lifting", "neutral position" and "descending". It can adopt an electric control or hydraulic pilot control form. The two working oil ports of the lifting valve 13 are respectively connected to the rodless cavity and the rod cavity of the lifting cylinder 1. In order to prevent the "cylinder pulling" phenomenon from occurring when the carriage is lifted to the highest point, a balancing valve 14 is provided at the rod chamber of the lifting oil cylinder 1. The spring at the end of the valve core of the balancing valve 14 sets the opening pressure of the valve core, and the pilot pressure at the other end of the valve core is taken from the pressure of the rodless chamber of the lifting oil cylinder 1. When the pressure of the rodless chamber reaches the opening pressure of the balancing valve 14, the valve core spring force is overcome, and the valve core is pushed to open the oil path from the rod chamber of the lifting oil cylinder 1 to the lifting valve 13, and the lifting oil cylinder 1 is lifted normally. When the carriage is lifted to a certain height, the ore is accumulated at the bottom of the carriage, which generates a pulling force on the lifting oil cylinder 1, and the pressure of the rodless chamber of the lifting oil cylinder 1 decreases. When the pressure of the rodless chamber is lower than the opening pressure of the balancing valve 14, the balancing valve 14 closes the return oil path of the rod chamber of the lifting oil cylinder 1. At this time, the return oil of the rod chamber is cut off, and the pressure begins to rise, preventing the lifting oil cylinder 1 from continuing to extend, avoiding the "cylinder pulling" failure, and improving the stability and service life of the lifting oil cylinder 1.

[0035] When the carriage of a mining dump truck is lifted, the lifting cylinder 1 overcomes the deadweight of the carriage and the weight of the loaded materials, and converts most of the hydraulic energy driven by the hydraulic pump 11 into the gravitational potential energy of the load. This part is effective work, and another small part of the hydraulic energy is converted into heat due to throttling loss to increase the oil temperature. When the carriage is lowered, the loaded materials have been unloaded, and the gravitational potential energy of the deadweight of the carriage is converted into hydraulic energy by the lifting cylinder 1, and then converted into heat through the throttling of the control valve, causing energy loss and rapidly increasing the temperature of the hydraulic oil. The heat dissipation device is used to dissipate the heat of the hydraulic oil. The radiator 4.1 is an oil cooler, which dissipates the heat of the hydraulic oil through the oil cooler, and the cooling fan 5.2 dissipates the heat for the oil cooler, which speeds up the cooling of the hydraulic oil.

[0036] In order to reduce the energy loss of mining dump trucks and improve the utilization rate of the recovered energy of the gravitational potential energy of the car body, the present embodiment provides an energy recovery and utilization system for mining dump trucks, which converts the gravitational potential energy of the car body when it descends into hydraulic energy and recovers it into the accumulator 2. The recovered energy is used to drive the hydraulic motor 5.1 and the cooling fan 5.2 to dissipate the heat of the hydraulic oil and achieve thermal balance, thereby achieving energy-saving effect.

[0037] like Figure 1 As shown, the energy recovery system of the mining dump truck includes an accumulator 2, an energy recovery valve group 3, a heat balance oil circuit 4, an energy recovery oil circuit 5 and a proportional control valve 6. The oil inlet of the energy recovery valve group 3 is connected to the rodless cavity, and the oil outlet of the energy recovery valve group 3 can be connected to the oil inlet and outlet of the accumulator 2, so that when the car body descends, the hydraulic oil in the rodless cavity is stored in the accumulator 2 for recovery. The radiator 4.1 is arranged on the heat balance oil circuit 4, the hydraulic motor 5.1 is arranged on the energy recovery oil circuit 5, and the hydraulic motor 5.1 is mechanically connected to the cooling fan 5.2. The oil inlet of the heat balance oil circuit 4 and the oil inlet of the energy recovery oil circuit 5 are both connected to the oil inlet and outlet of the accumulator 2, and the oil outlet of the heat balance oil circuit 4 and the oil outlet of the energy recovery oil circuit 5 are both connected to the oil tank 10. The hydraulic oil recovered by the accumulator 2 is distributed to the radiator 4.1 in the heat balance oil circuit 4 and the hydraulic motor 5.1 in the energy recovery oil circuit 5. While the radiator 4.1 dissipates heat for the hydraulic oil, the hydraulic motor 5.1 drives the cooling fan 5.2 to cool the radiator 4.1, so that the hydraulic oil can be cooled quickly. The proportional control valve 6 is arranged on the heat balance oil circuit 4, and is used to adjust the flow of the hydraulic oil in the accumulator 2 into the heat balance oil circuit 4, so that the flow through the radiator 4.1 changes with the change of the energy recovered in the accumulator 2, so as to improve the utilization rate of the recovered energy of the accumulator 2; the converted heat dissipation power is used to reduce the system hydraulic oil temperature and achieve thermal balance.

[0038] The mining dump truck also includes a controller 9 and a control panel, which are electrically connected to the controller 9. A "floating" button is provided on the control panel. When the driver presses the "floating" button, the rod chamber and the rodless chamber of the lifting cylinder 1 are connected, and at the same time connected to the oil tank 10, and the telescopic rod of the lifting cylinder 1 is freely extended or retracted under the action of the load.

[0039] The energy recovery valve group 3 includes port A, port B, port T, port T1, port C, port D, port ACC and port Ma. The rodless cavity is connected to the energy recovery valve group 3 through port A, port B of the energy recovery valve group 3 is connected to the rod cavity, port T and port T1 are both connected to the oil tank 10, port C is connected to the radiator 4.1, port D is connected to the hydraulic motor 5.1, port ACC is connected to the accumulator 2, port Ma is connected to the sensor, and the energy recovery valve group 3 and the sensor are both electrically connected to the controller 9.

[0040] In one embodiment, the energy recovery valve group 3 includes a floating solenoid valve 3.1, which is used to control the communication between the rodless chamber and the oil inlet and outlet of the accumulator 2. When the driver presses the "float" button, the controller 9 can control the floating solenoid valve 3.1 to be energized. When the car is lifted, the electromagnet of the floating solenoid valve 3.1 is in a power-off state, the oil circuit between the rodless chamber and the oil inlet and outlet of the accumulator 2 is disconnected, and the pressure of the rodless chamber of the lifting cylinder 1 begins to rise, overcoming the gravity of the car and the loaded materials, pushing the car to lift, and unloading the materials. When the car is lifted to the highest point and the materials are unloaded, the driver uses the "float" command to make the car fall. At this time, the weight of the car acts on the rodless chamber of the lifting cylinder 1, so that the rodless chamber has a certain back pressure. When the driver presses the "float" button, the electromagnet of the floating solenoid valve 3.1 is energized, the oil circuit between the rodless chamber and the oil inlet and outlet of the accumulator 2 is connected, and the hydraulic oil in the rodless chamber enters the accumulator 2 through the floating solenoid valve 3.1 for recovery.

[0041] In one embodiment, the energy recovery valve group 3 further includes a cover valve 3.2, and the floating solenoid valve 3.1 is used to control the communication between the control oil port of the cover valve 3.2 and the oil tank 10. The oil inlet of the cover valve 3.2 is connected to the rodless chamber, and the oil outlet of the cover valve 3.2 can be connected to the oil inlet and outlet of the accumulator 2. The cover valve 3.2 is a large-diameter, cone valve-type logic cartridge valve, which is suitable for large-flow systems. It adopts a cone valve sealing form, has good sealing performance, and small pressure loss. Depending on whether the control oil port is passed through the pressure oil, the cover valve 3.2 has two working states: "open" or "closed". When the control oil port is passed through the pressure oil, the control pressure presses the valve core against the valve seat, and the two working oil ports are closed. At this time, the cover valve 3.2 is in the "closed" state. When the control oil port is in the unloading and oil return state, the pressure oil passed through any working oil port can push the valve core open and open the oil circuit with the other working oil port. At this time, the cover valve 3.2 is in the "open" state. The connection between the rodless chamber and the oil inlet and outlet of the accumulator 2 is controlled by the cover valve 3.2, and the connection between the control oil port of the cover valve 3.2 and the oil tank 10 is controlled by the floating solenoid valve 3.1, so that a large flow of hydraulic oil in the rodless chamber can be recovered.

[0042] When the carriage is lifted, the floating solenoid valve 3.1 is in the power-off state, closing the oil circuit between the control oil port of the cover valve 3.2 and the oil return port T1. The hydraulic oil in the rodless chamber enters the cover valve 3.2 through the A port, and enters the control oil port through the throttle hole of the cover valve 3.2, pressing the valve core against the valve seat. At this time, the cover valve 3.2 is in the closed state, closing the oil circuit between the A port and the oil return port T, and the pressure of the rodless chamber of the lifting cylinder 1 begins to rise, overcoming the gravity of the carriage and the loaded materials, pushing the carriage to lift, and completing the unloading of the materials.

[0043] When the carriage is lifted to the highest point and the material is unloaded, the driver uses the "float" command to make the carriage fall. At this time, the weight of the carriage acts on the rodless chamber of the lifting cylinder 1, so that the rodless chamber has a certain back pressure. When the driver presses the "float" button, the floating solenoid valve 3.1 is energized to open the oil circuit from the control oil port of the cover valve 3.2 to the return oil port T1. The pressure oil in the rodless chamber passes through the throttle hole of the cover valve 3.2 through the A port, and then returns to the oil tank 10 through the return oil port T1. Due to the effect of the throttle hole, the flow rate is very small. At this time, the control oil port is connected to the return oil port T1, and there is no effect of controlling the oil pressure. The hydraulic oil in the rodless chamber enters the cover valve 3.2 through the A port, pushing the valve core of the cover valve 3.2 to move upward. The cover valve 3.2 is in an open state, and the hydraulic oil enters the accumulator 2 through the cover valve 3.2.

[0044] In one embodiment, the oil outlet of the cover valve 3.2 can also communicate with the rod chamber, and a second one-way valve 3.5 is provided between the rod chamber and the oil outlet of the cover valve 3.2, and the second one-way valve 3.5 is used for one-way communication between the oil outlet of the cover valve 3.2 and the rod chamber. As the carriage descends, the telescopic rod of the lifting oil cylinder 1 retracts. To prevent the rod chamber from being in an empty state, the oil in the rodless chamber enters the cover valve 3.2, and then enters the rod chamber through the oil outlet of the cover valve 3.2 and the second one-way valve 3.5, so as to replenish the oil in the rod chamber and prevent the rod chamber from being empty.

[0045] In one embodiment, the energy recovery valve group 3 further includes a reversing valve 3.3, the oil inlet of the reversing valve 3.3 is connected to the oil outlet of the cover valve 3.2, the first working oil port of the reversing valve 3.3 is connected to the oil inlet and outlet of the accumulator 2, and the second working oil port of the reversing valve 3.3 is connected to the oil tank 10. By setting the reversing valve 3.3, the valve core opening size of the reversing valve 3.3 is determined according to the back pressure of the rodless chamber return oil, and then whether to recover energy and the amount of recovered energy are determined, so as to ensure that the hydraulic oil generated by the rodless chamber back pressure can be effectively recovered and utilized, and avoid the car body lowering speed slowing down due to the reduction of the rodless chamber return oil back pressure, thereby affecting the operating efficiency of the mining dump truck.

[0046] Furthermore, when the pressure of the oil outlet of the cover valve 3.2 is greater than or equal to the set pressure, the oil inlet of the reversing valve 3.3 is connected to the first working oil port of the reversing valve 3.3; when the pressure of the oil outlet of the cover valve 3.2 is less than the set pressure, the oil inlet of the reversing valve 3.3 is connected to the second working oil port of the reversing valve 3.3. When the carriage is lowered, when the back pressure of the rodless chamber is large, when the pressure of the oil outlet of the cover valve 3.2 is greater than or equal to the set pressure, the spring force of the reversing valve 3.3 can be overcome, the valve core of the reversing valve 3.3 is pushed to the right, and the oil path between the oil outlet of the cover valve 3.2 and the oil inlet and outlet of the accumulator 2 is opened, and the hydraulic oil in the rodless chamber is recovered to the accumulator 2, so that the energy stored in the accumulator 2 can be effectively utilized. When the back pressure of the rodless chamber decreases and is lower than the set pressure, the valve core of the reversing valve 3.3 is in the left position, opening the oil outlet of the cover valve 3.2 and the oil circuit of the oil tank 10, and the hydraulic oil returns to the oil tank 10 through the oil return port T, so that the oil in the rodless chamber can return quickly, speeding up the car's descent speed and avoiding a reduction in the car's descent speed.

[0047] Regarding the set pressure, those skilled in the art can set it according to the spring force of the reversing valve 3.3.

[0048] In one embodiment, a first non-return valve 3.4 is provided between the first working oil port of the reversing valve 3.3 and the oil inlet and outlet of the accumulator 2. The first non-return valve 3.4 is used for one-way communication between the first working oil port of the reversing valve 3.3 and the oil inlet and outlet of the accumulator 2. The first non-return valve 3.4 is used to maintain the pressure of the accumulator 2 and prevent the hydraulic oil in the accumulator 2 from backflowing and leaking, causing energy loss.

[0049] In one embodiment, a throttle valve 3.6 is further provided between the oil inlet and outlet of the accumulator 2 and the oil inlet of the heat balance oil circuit 4 and the oil inlet of the energy recovery oil circuit 5. That is, the hydraulic oil in the accumulator 2 enters the heat balance oil circuit 4 and the energy recovery oil circuit 5 after being throttled by the throttle valve 3.6. When the oil in the accumulator 2 is full, the pressure begins to rise, and is divided into two paths after passing through the throttle valve 3.6. One path enters the hydraulic motor 5.1 through the D port, and the pressure of the oil inlet of the hydraulic motor 5.1 also begins to rise, thereby driving the hydraulic motor 5.1 to rotate. The output shaft of the hydraulic motor 5.1 is connected to the cooling fan 5.2, thereby driving the cooling fan 5.2 to rotate and dissipate heat from the oil cooler. The pressure at the oil inlet of the hydraulic motor 5.1 changes in direct proportion to the speed of the cooling fan 5.2. A pressure difference is generated at both ends of the throttle valve 3.6, so that the pressure of the accumulator 2 is higher than the pressure at the oil inlet of the hydraulic motor 5.1, thereby ensuring that the hydraulic oil recovered by the energy first fills the accumulator 2, and the pressure of the accumulator 2 is released steadily and slowly, producing a continuous cooling effect. The other way enters the oil cooler through the C port, and the hydraulic oil after heat dissipation in the oil cooler returns to the oil tank 10.

[0050] In one embodiment, a bypass check valve 4.2 is further provided in the heat balance oil circuit 4, and the bypass check valve 4.2 is connected in parallel with the radiator 4.1. The bypass check valve 4.2 is connected in parallel with the oil cooler. When the pressure of the oil inlet of the oil cooler exceeds the opening pressure of the bypass check valve 4.2, the hydraulic oil returns to the oil tank 10 through the bypass check valve 4.2, so as to prevent the oil cooler from being damaged by abnormal high pressure impact.

[0051] The proportional regulating valve 6 is arranged after the throttle valve 3.6 and before the C port. The flow of the hydraulic oil entering the oil cooler is regulated by the proportional regulating valve 6. The controller 9 proportionally adjusts the opening size of the proportional regulating valve 6 by controlling the current size of the proportional regulating valve 6, thereby changing the flow size of the hydraulic oil entering the oil cooler.

[0052] In one embodiment, the oil inlet and outlet of the accumulator 2 are provided with a pressure sensor 7 and a temperature sensor 8. The pressure sensor 7 is used to detect the pressure of the oil inlet and outlet of the accumulator 2. The temperature sensor 8 is used to detect the temperature of the hydraulic oil in the accumulator 2. The pressure sensor 7 and the temperature sensor 8 are both connected to the oil inlet and outlet of the accumulator 2 through the Ma port, and the pressure sensor 7 and the temperature sensor 8 are both connected to the controller 9 for communication. The pressure sensor 7 sends the detected oil pressure of the oil inlet and outlet of the accumulator 2 to the controller 9, and the temperature sensor 8 sends the detected oil temperature of the oil inlet and outlet of the accumulator 2 to the controller 9. The controller 9 calculates the recovered energy and the heat of the hydraulic oil according to the received oil pressure value and oil temperature value.

[0053] The controller 9 changes the current of the proportional control valve 6 according to the pressure change of the oil inlet and outlet of the accumulator 2 detected by the pressure sensor 7, so as to control the flow entering the oil cooler. When the car begins to descend, the accumulator 2 is in the process of filling, the current of the proportional control valve 6 is zero, and the proportional control valve 6 is closed. When the pressure of the oil inlet and outlet of the accumulator 2 begins to rise, the speed of the hydraulic motor 5.1 and the cooling fan 5.2 begins to increase, and the current of the proportional control valve 6 is increased, so that the opening of the proportional control valve 6 increases, and the flow entering the oil cooler increases. At this time, the cooling power required by the system shows an increasing trend. When the accumulator 2 is filled to the maximum pressure, with the output of the flow, the pressure of the oil inlet and outlet of the accumulator 2 begins to gradually decrease, the speed of the hydraulic motor 5.1 and the cooling fan 5.2 begins to decrease, and the current of the proportional control valve 6 is reduced, so that the opening of the proportional control valve 6 decreases, and the flow entering the oil cooler decreases. At this time, the cooling power of the system shows a decreasing trend. By adjusting the current of the proportional control valve 6, the flow of the oil cooler changes with the pressure of the inlet and outlet of the accumulator 2, so that the recovered energy of the accumulator 2 can be used with maximum efficiency, converted into heat dissipation power, and reduce the oil temperature of the hydraulic system.

[0054] The controller 9 controls the heat dissipation power of the heat dissipation fan 5.2 according to the oil temperature detected by the temperature sensor 8, so that the system reaches a thermal equilibrium state, thereby reducing the energy consumption of the system.

[0055] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. An energy recovery and utilization system for a mining dump truck, the mining dump truck comprising a lifting cylinder (1) and a heat dissipation device, the lifting cylinder (1) comprising a rodless cavity and a rod cavity, the heat dissipation device comprising a radiator (4.1) and a heat dissipation fan (5.2), the radiator (4.1) being used to dissipate heat from hydraulic oil flowing out of the rodless cavity, and the heat dissipation fan (5.2) being used to dissipate heat from the radiator (4.1); characterized in that: The energy recovery and utilization system comprises: Accumulator (2); An energy recovery valve group (3), wherein the oil inlet of the energy recovery valve group (3) is in communication with the rodless chamber, and the oil outlet of the energy recovery valve group (3) can be in communication with the oil inlet and outlet of the accumulator (2); A heat balance oil circuit (4), wherein the radiator (4.1) is arranged on the heat balance oil circuit (4); An energy recovery oil circuit (5), wherein a hydraulic motor (5.1) is provided on the energy recovery oil circuit (5), and the hydraulic motor (5.1) is mechanically connected to the cooling fan (5.2); The oil inlet of the heat balance oil circuit (4) and the oil inlet of the energy recovery oil circuit (5) are both in communication with the oil inlet and outlet of the accumulator (2), and the oil outlet of the heat balance oil circuit (4) and the oil outlet of the energy recovery oil circuit (5) are both in communication with the oil tank (10); A proportional regulating valve (6) is arranged on the thermal balance oil circuit (4) and is used to regulate the flow rate of the hydraulic oil in the accumulator (2) entering the thermal balance oil circuit (4).

2. The energy recovery and utilization system for a mining dump truck according to claim 1, characterized in that: The energy recovery valve group (3) comprises a floating solenoid valve (3.1), and the floating solenoid valve (3.1) is used to control the communication between the rodless chamber and the oil inlet and outlet ports of the accumulator (2).

3. The energy recovery and utilization system for a mining dump truck according to claim 2, characterized in that: The energy recovery valve group (3) further comprises a cover valve (3.2), the floating solenoid valve (3.1) is used to control the connection between the control oil port of the cover valve (3.2) and the oil tank (10), the oil inlet of the cover valve (3.2) is connected to the rodless chamber, and the oil outlet of the cover valve (3.2) can be connected to the oil inlet and outlet of the accumulator (2).

4. The energy recovery and utilization system for a mining dump truck according to claim 3, characterized in that: The energy recovery valve group (3) further comprises a reversing valve (3.3), the oil inlet of the reversing valve (3.3) being in communication with the oil outlet of the cover valve (3.2), the first working oil port of the reversing valve (3.3) being in communication with the oil inlet and outlet of the accumulator (2), and the second working oil port of the reversing valve (3.3) being in communication with the oil tank (10); When the pressure at the oil outlet of the cover valve (3.2) is greater than or equal to the set pressure, the oil inlet of the reversing valve (3.3) is communicated with the first working oil port of the reversing valve (3.3); when the pressure at the oil outlet of the cover valve (3.2) is less than the set pressure, the oil inlet of the reversing valve (3.3) is communicated with the second working oil port of the reversing valve (3.3).

5. The energy recovery and utilization system for a mining dump truck according to claim 4, characterized in that: A first check valve (3.4) is provided between the first working oil port of the reversing valve (3.3) and the oil inlet and outlet ports of the accumulator (2), and the first check valve (3.4) is used for one-way conduction between the first working oil port of the reversing valve (3.3) and the oil inlet and outlet ports of the accumulator (2).

6. The energy recovery and utilization system for a mining dump truck according to claim 3, characterized in that: The oil outlet of the cover valve (3.2) can also be connected to the rod chamber, and a second one-way valve (3.5) is provided between the rod chamber and the oil outlet of the cover valve (3.2). The second one-way valve (3.5) is used for one-way communication of the oil outlet of the cover valve (3.2) to the rod chamber.

7. The energy recovery and utilization system for a mining dump truck according to any one of claims 1 to 6, characterized in that: A throttle valve (3.6) is also provided between the oil inlet and outlet of the accumulator (2), the oil inlet of the heat balance oil circuit (4), and the oil inlet of the energy recovery oil circuit (5).

8. The energy recovery and utilization system for a mining dump truck according to any one of claims 1 to 6, characterized in that: A bypass check valve (4.2) is also provided in the heat balance oil circuit (4), and the bypass check valve (4.2) is connected in parallel with the radiator (4.1).

9. The energy recovery and utilization system for a mining dump truck according to any one of claims 1 to 6, characterized in that: The oil inlet and outlet ports of the accumulator (2) are provided with pressure sensors (7), and the pressure sensors (7) are used to detect the pressure of the oil inlet and outlet ports of the accumulator (2).

10. The energy recovery and utilization system for a mining dump truck according to any one of claims 1 to 6, characterized in that: The oil inlet and outlet ports of the accumulator (2) are provided with temperature sensors (8), and the temperature sensors (8) are used to detect the temperature of the hydraulic oil in the accumulator (2).

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