Suspension energy feedback device of mining wide-body dumper and control method of suspension energy feedback device

Abstract

A suspension energy feedback device of a mining wide-body dumper comprises a suspension cylinder, a generator and a hydraulic motor, the suspension cylinder comprises a cylinder body, a piston arranged in the cylinder body and a piston rod connected with the piston, and the piston divides the interior of the cylinder body into a rodless cavity and a rod cavity; the piston rod is of a hollow structure, one end of the piston rod is connected with the rodless cavity, the other end of the piston rod is connected with a first oil port of the hydraulic motor through a second one-way valve, and the rod cavity is connected with a second oil port of the hydraulic motor through a third one-way valve. The second one-way valve and the third one-way valve are arranged on the oil pipeline. Hydraulic oil and high-pressure inert gas are arranged in the suspension cylinder. During the compression stroke of the suspension cylinder, hydraulic oil flows to a rod cavity from the rodless cavity side through a first one-way valve in the suspension cylinder; when the suspension cylinder extends, hydraulic oil sequentially flows to the rodless cavity from the rod cavity side through the third one-way valve, the hydraulic motor and the second one-way valve, and the hydraulic motor rotates to drive the generator to generate electricity.

Description

Technical Field

[0001] The invention relates to a dump truck, in particular to a suspension energy feeding device of a wide-body dump truck for mining and a control method thereof. Background Art

[0002] Pure electric wide-body dump trucks for mining have become a development trend, and energy recovery during driving is becoming increasingly important. Mine roads are very complex, and wide-body dump trucks for mining have a very large load capacity. During driving, the suspension vibrates violently, and the energy recovery potential is very large.

[0003] At present, the energy from the violent vibration of the dump truck's gas-oil suspension can be partially recovered by using the energy feedback device. During the stretching process, the energy in the low-pressure accumulator of the energy feedback device is not recovered, resulting in partial energy waste. In addition, the hydraulic circuit of the energy feedback device contains two large-volume accumulators, which take up too much space. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a suspension energy feeding device for a wide-body dump truck for mining and a control method thereof, which utilizes the volume of the suspension cylinder itself, eliminates the accumulator, and improves space utilization; simplifies the energy feeding device and improves the energy feeding efficiency.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a suspension energy feeding device for a wide-body dump truck for mining, comprising a suspension cylinder, a generator and a hydraulic motor, the suspension cylinder is connected to the hydraulic motor through an oil pipeline, the hydraulic motor is connected to the generator through a coupling, the suspension cylinder comprises a cylinder body, a piston arranged in the cylinder body and a piston rod connected to the piston, the piston divides the cylinder body into a rodless chamber and a rod chamber; a first one-way valve connecting the rodless chamber and the rod chamber is provided on the piston, the piston rod is a hollow structure, one end of the piston rod is connected to the rodless chamber, the other end of the piston rod is connected to the first oil port of the hydraulic motor through a second one-way valve, the rod chamber is connected to the second oil port of the hydraulic motor through a third one-way valve, the second one-way valve and the third one-way valve are arranged on the oil pipeline, and hydraulic oil and high-pressure inert gas are provided in the suspension cylinder.

[0006] As an improvement, the generator generates electricity and stores energy in a battery through a rectifier.

[0007] As an improvement, a bypass valve is provided between the first oil port and the second oil port of the hydraulic motor, and the second one-way valve is connected to the hydraulic motor via a reversing valve.

[0008] As an improvement, the liquid level of the hydraulic oil is higher than the upper surface of the piston, and the high-pressure inert gas is located in the rodless chamber.

[0009] The energy feeding control method of the present invention comprises the following steps: When the vehicle is running and the suspension cylinder is in the compression stroke, the high-pressure inert gas in the rodless cavity is compressed, the vibration kinetic energy of the vehicle body is converted into compression potential energy, and a part of the vibration kinetic energy is converted into hydraulic energy to drive the hydraulic oil in the rodless cavity to flow and enter the rod cavity through the first one-way valve; When the vehicle is running and the suspension cylinder is in the extension stroke, the hydraulic oil in the rod chamber flows out under the pressure of the piston and flows through the hydraulic motor through the third one-way valve, and the hydraulic energy is converted into the mechanical energy of the hydraulic motor. The hydraulic motor rotates and drives the generator to generate electricity. The hydraulic oil after energy conversion returns to the rodless chamber through the second one-way valve and the piston rod; When the vehicle brakes, the reversing valve on the oil pipeline is controlled to reverse direction, cutting off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the suspension cylinder in the extension stroke cannot enter the rodless chamber through the hydraulic motor, limiting the extension stroke of the suspension cylinder and reducing the forward tilt of the vehicle. When the vehicle turns, the reversing valve on the control oil pipeline switches direction, cutting off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the suspension cylinder in the extension stroke cannot enter the rodless chamber through the hydraulic motor, limiting the extension stroke of the suspension cylinder and suppressing the roll of the vehicle.

[0010] As an improvement, when the vehicle is driving, the middle axle is impacted, which will cause the middle axle suspension cylinder to be compressed, and the hydraulic oil in the rodless chamber of the middle axle suspension cylinder flows into the rod chamber through the first one-way valve; while the middle axle suspension cylinder is compressed, the rear axle suspension cylinder will extend, and the hydraulic oil in the rod chamber of the rear axle suspension cylinder will flow back to the rodless chamber through the third one-way valve, the hydraulic motor, and the second one-way valve under the pressure of the piston; when the middle axle suspension cylinder is compressed to the limit position, it will begin to rebound and extend, and the hydraulic oil in the rod chamber of the middle axle suspension cylinder will flow back to the rodless chamber through the third one-way valve, the hydraulic motor, and the second one-way valve under the pressure of the piston; while the middle axle suspension cylinder is extending, the rear axle suspension cylinder will be compressed, and the hydraulic oil in the rodless chamber of the rear axle suspension cylinder will flow into the rod chamber through the first one-way valve; the middle axle suspension cylinder and the rear axle suspension cylinder on the same side alternately convert the compression potential energy in the cylinder into electrical energy, and this cycle is repeated to ensure the continuous and stable feedback energy.

[0011] As an improvement, when the vehicle brakes, the reversing valve on the control oil pipeline is reversed to cut off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the mid-axle suspension cylinder and the rear-axle suspension cylinder in the extension stroke cannot enter the rodless chamber through the hydraulic motor, thereby limiting the extension stroke of the suspension cylinder and reducing the degree of forward tilt of the vehicle.

[0012] As an improvement, when the vehicle turns, the reversing valve on the control oil pipeline is operated to reverse direction, cutting off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the suspension cylinder on the inner side of the turn cannot enter the rodless chamber through the hydraulic motor, thereby limiting the extension stroke of the suspension cylinder and suppressing the roll of the vehicle.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The vehicle vibration energy is fully recovered, which improves the vehicle energy recovery efficiency and is more effective in suppressing vehicle vibration, that is, the driving smoothness is better; 2. The elimination of the accumulator reduces the energy loss during the compression and release process of the accumulator, further improving the efficiency of energy recovery; 3. The volume space inside the suspension cylinder is fully utilized and the accumulator is eliminated, thereby greatly saving the space of the vehicle body and facilitating the promotion of the energy feeding device on mining dump trucks.

[0014] 4. Cut off the hydraulic motor circuit by controlling the reversing valve to control the vehicle body state during braking and steering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the pipeline diagram of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, a suspension energy feeding device for a wide-body dump truck for mining includes a suspension cylinder 1, a generator 4 and a hydraulic motor 3. The suspension cylinder 1 is connected to the hydraulic motor 3 through an oil pipeline, and the hydraulic motor 3 is connected to the generator 4 through a coupling. The generator 4 generates electricity and stores energy in a battery 6 through a rectifier 5. The suspension cylinder 1 includes a cylinder body, a piston 14 arranged in the cylinder body and a piston rod 15 connected to the piston 14, the piston 14 divides the cylinder body into a rodless chamber 11 and a rod chamber 13; the piston 14 is provided with a first one-way valve 12 connecting the rodless chamber 11 and the rod chamber 13; the piston rod 15 is a hollow structure, one end of the piston rod 15 is connected to the rodless chamber 11, and the other end of the piston rod 15 is connected to the first oil port of the hydraulic motor 3 through a second one-way valve 9, and the rod chamber 13 is connected to the second oil port of the hydraulic motor 3 through a third one-way valve 2, and the second one-way valve 9 and the third one-way valve 2 are arranged on the oil pipeline; a bypass valve 8 is provided between the first oil port and the second oil port of the hydraulic motor 3, and the second one-way valve 9 is connected to the hydraulic motor 3 through a reversing valve 7; hydraulic oil and high-pressure inert gas are provided in the suspension cylinder, the liquid level of the hydraulic oil is higher than the upper surface of the piston, and the high-pressure inert gas is located in the rodless chamber 11.

[0018] During the driving process of the vehicle, when the middle axle is impacted, the middle axle suspension cylinder will be compressed, the inert gas in the rodless chamber 11 of the middle axle suspension cylinder will be compressed, the vibration kinetic energy of the vehicle body will be converted into compression potential energy, and a small part of the vibration kinetic energy will be converted into hydraulic energy to drive the hydraulic oil in the rodless chamber 11 to flow, and the hydraulic oil will directly flow into the rod chamber 13 through the first check valve 12 in the middle axle suspension cylinder. While the middle axle suspension cylinder is compressed, the rear axle suspension cylinder will extend, and the hydraulic oil in the rod chamber 13 of the rear axle suspension cylinder will flow out from its oil port under the pressure of the piston, and will flow back to the rodless chamber 11 after passing through the third check valve 2, the hydraulic motor 3, and the second check valve 9 in sequence; when the hydraulic oil flows through the hydraulic motor 3, it will drive the hydraulic motor 3 to rotate, thereby converting the hydraulic energy into mechanical energy; the hydraulic motor 3 is connected to the generator 4 through a coupling, so when the hydraulic motor 3 rotates, it will drive the motor to rotate, and when the motor rotates, it will cut the magnetic flux lines to generate electrical energy, that is, the mechanical energy is converted into electrical energy.

[0019] When the middle axle suspension cylinder is compressed to the limit position, it will start to rebound and stretch. The hydraulic oil in the rod chamber 13 of the middle axle suspension cylinder will flow out from its oil port under the pressure of the piston, and will flow back to the rodless chamber 11 after passing through the third one-way valve 2, hydraulic motor 3, and second one-way valve 9 in sequence; when the hydraulic oil flows through the hydraulic motor 3, it will drive the hydraulic motor 3 to rotate, and the motor will drive the generator 4 to rotate. At this time, the compression potential energy in the middle axle suspension cylinder is converted into hydraulic energy and then into mechanical energy, and finally into electrical energy. While the middle axle suspension cylinder is stretching, the rear axle suspension cylinder will be compressed, and the inert gas in the rodless chamber 11 of the rear axle suspension cylinder will be compressed. The vibration kinetic energy of the vehicle body will be converted into compression potential energy. A small part of the vibration kinetic energy will be converted into hydraulic energy to drive the hydraulic oil in the rodless chamber 11 to flow, and the hydraulic oil will flow directly into the rod chamber 13 through the first one-way valve 12 in the middle axle suspension cylinder.

[0020] When the middle axle suspension cylinder is compressed, the vibration energy is converted into compression potential energy. At the same time, the rear axle suspension cylinder is extended to convert the compression potential energy into hydraulic energy. The hydraulic energy is then converted into mechanical energy through the hydraulic motor 3 and finally into electrical energy. When the rear axle suspension cylinder is compressed, the vibration energy is converted into compression potential energy. At the same time, the middle axle suspension cylinder is extended to convert the compression potential energy into hydraulic energy. The hydraulic energy is then converted into mechanical energy through the hydraulic motor 3 and finally into electrical energy. The suspension cylinders on the same side of the middle axle and rear axle alternately convert the compression potential energy in the cylinder into electrical energy, and this cycle is repeated to ensure the continuous and stable feedback energy.

[0021] When the vehicle brakes, due to the effect of inertia, the vehicle will compress the front axle suspension cylinder and stretch the rear axle suspension cylinder, causing the vehicle to tilt forward, resulting in a brake nodding phenomenon, which will cause great discomfort to the driver. Therefore, when the vehicle brakes, the control reversal valve 7 is operated and reversed to cut off the circuit of the hydraulic motor 3. At this time, when the middle axle suspension cylinder and the rear axle suspension cylinder are stretched, the hydraulic oil in the rod chamber 13 cannot enter the rodless chamber 11 through the hydraulic motor 3. Therefore, the forward tilt of the vehicle can be greatly reduced, and the driver's brake nodding discomfort can be greatly reduced.

[0022] When the vehicle turns, due to the centrifugal force, the vehicle will roll over. The smaller the stiffness of the suspension cylinder, the more serious the rollover. When the vehicle rolls over, it will not only affect the comfort of the driver, but also pose a certain risk of rollover. Therefore, when the vehicle turns, the reversing valve 7 is controlled to change direction, cutting off the hydraulic circuit of the suspension system. The hydraulic oil in the rod chamber 13 of the suspension cylinder on the inner side of the turn cannot enter the rodless chamber 11 through the hydraulic motor 3, limiting the extension stroke of the suspension cylinder and suppressing the rollover of the vehicle.

Claims

1. A suspension energy feeding device for a wide-body dump truck for mining, comprising a suspension cylinder, a generator and a hydraulic motor, wherein the suspension cylinder is connected to the hydraulic motor through an oil pipeline, the hydraulic motor is connected to the generator through a coupling, the suspension cylinder comprises a cylinder body, a piston arranged in the cylinder body and a piston rod connected to the piston, the piston divides the cylinder body into a rodless chamber and a rod chamber; characterized in that: The piston is provided with a first one-way valve connecting the rodless chamber and the rod chamber. The piston rod is a hollow structure. One end of the piston rod is connected to the rodless chamber, and the other end of the piston rod is connected to the first oil port of the hydraulic motor through a second one-way valve. The rod chamber is connected to the second oil port of the hydraulic motor through a third one-way valve. The second one-way valve and the third one-way valve are arranged on the oil pipeline, and hydraulic oil and high-pressure inert gas are arranged in the suspension cylinder.

2. The suspension energy feeding device for a wide-body dump truck for mining according to claim 1 is characterized in that: The generator generates electricity and stores energy in a battery through a rectifier.

3. The suspension energy feeding device for a wide-body dump truck for mining according to claim 1 is characterized in that: A bypass valve is provided between the first oil port and the second oil port of the hydraulic motor, and the second one-way valve is connected to the hydraulic motor through a reversing valve.

4. The suspension energy feeding device for a wide-body dump truck for mining according to claim 1 is characterized in that: The liquid level of the hydraulic oil is higher than the upper surface of the piston, and the high-pressure inert gas is located in the rodless chamber.

5. A control method for the suspension energy feeding device of a wide-body dump truck for mining as claimed in claim 1, characterized in that: The following steps are involved: When the vehicle is running and the suspension cylinder is in the compression stroke, the high-pressure inert gas in the rodless cavity is compressed, the vibration kinetic energy of the vehicle body is converted into compression potential energy, and a part of the vibration kinetic energy is converted into hydraulic energy to drive the hydraulic oil in the rodless cavity to flow and enter the rod cavity through the first one-way valve; When the vehicle is running and the suspension cylinder is in the extension stroke, the hydraulic oil in the rod chamber flows out under the pressure of the piston and flows through the hydraulic motor through the third one-way valve, and the hydraulic energy is converted into the mechanical energy of the hydraulic motor. The hydraulic motor rotates and drives the generator to generate electricity. The hydraulic oil after energy conversion returns to the rodless chamber through the second one-way valve and the piston rod; When the vehicle brakes, the reversing valve on the oil pipeline is controlled to reverse direction, cutting off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the suspension cylinder in the extension stroke cannot enter the rodless chamber through the hydraulic motor, limiting the extension stroke of the suspension cylinder and reducing the forward tilt of the vehicle. When the vehicle turns, the reversing valve on the control oil pipeline switches direction, cutting off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the suspension cylinder in the extension stroke cannot enter the rodless chamber through the hydraulic motor, limiting the extension stroke of the suspension cylinder and suppressing the roll of the vehicle.

6. The control method of the suspension energy feeding device of a wide-body dump truck for mining according to claim 5 is characterized in that: When the vehicle is driving, the middle axle will be impacted and the middle axle suspension cylinder will be compressed, and the hydraulic oil in the rodless chamber of the middle axle suspension cylinder will flow into the rod chamber through the first one-way valve; while the middle axle suspension cylinder is compressed, the rear axle suspension cylinder will extend, and the hydraulic oil in the rod chamber of the rear axle suspension cylinder will flow back to the rodless chamber through the third one-way valve, the hydraulic motor and the second one-way valve under the pressure of the piston; when the middle axle suspension cylinder is compressed to the limit position, it will begin to rebound and extend, and the hydraulic oil in the rod chamber of the middle axle suspension cylinder will flow back to the rodless chamber through the third one-way valve, the hydraulic motor and the second one-way valve under the pressure of the piston; while the middle axle suspension cylinder is extending, the rear axle suspension cylinder will be compressed, and the hydraulic oil in the rodless chamber of the rear axle suspension cylinder will flow into the rod chamber through the first one-way valve; the middle axle suspension cylinder and the rear axle suspension cylinder on the same side alternately convert the compression potential energy in the cylinder into electrical energy, and this cycle is repeated to ensure the continuous and stable feedback energy.

7. The control method of the suspension energy feeding device of a wide-body dump truck for mining according to claim 5 is characterized in that: When the vehicle brakes, the reversing valve on the control oil pipeline is reversed to cut off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the mid-axle suspension cylinder and the rear-axle suspension cylinder in the extension stroke cannot enter the rodless chamber through the hydraulic motor, limiting the extension stroke of the suspension cylinder and reducing the forward tilt of the vehicle.

8. The control method of the suspension energy feeding device of a wide-body dump truck for mining according to claim 5 is characterized in that: When the vehicle turns, the reversing valve on the control oil pipeline switches direction, cutting off the circuit of the hydraulic motor. The hydraulic oil in the rod chamber of the suspension cylinder on the inner side of the turn cannot enter the rodless chamber through the hydraulic motor, limiting the extension stroke of the suspension cylinder and suppressing the roll of the vehicle.

Images