Permanent magnet synchronous all-in-one machine energy recovery system applied to forklift and stacker

Abstract

The invention discloses a permanent magnet synchronous all-in-one machine energy recovery system applied to a forklift and a stacker, and relates to the field of motor control and energy recovery, the permanent magnet synchronous all-in-one machine energy recovery system comprises a vehicle body with moving wheels, a cab is arranged at the top of the vehicle body, and a console capable of controlling the whole recovery system is arranged in the cab; the lifting unit is used for lifting or lowering transported objects on the forklift and the stacker, and the energy recovery unit is used for recovering energy when the lifting unit is lowered; the lifting unit is arranged on one side of the vehicle body, and the energy recovery unit is arranged on the outer surface of the lifting unit; a worker can control the lifting unit to lift or lower goods through the control console, and in the unloading process of the lifting unit, the energy recovery unit can recover potential generated by the motor during descending and convert the potential into capacity, so that energy is provided for subsequent work of the lifting unit.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control and energy recovery, and specifically to a permanent magnet synchronous integrated machine energy recovery system applied to forklifts and stackers. Background Art

[0002] Forklifts and stackers are widely used in the logistics and warehousing industries, and their lifting mechanisms are usually driven by hydraulic systems or motors. During the descent of the goods, traditional hydraulic systems or motor-driven systems convert potential energy into heat energy and consume it, resulting in energy waste. Permanent magnet synchronous motors (PMSMs) have gradually been applied to the drive systems of forklifts and stackers due to their high efficiency and high power density.

[0003] During the descent of forklifts and stackers, due to reasons such as uneven cargo weight and poor control of the descent speed, the speed of the permanent magnet synchronous motor may be unstable. Unstable speed will cause fluctuations in the magnitude and frequency of the back electromotive force, thereby affecting the efficiency and stability of energy recovery. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve its technical problems is: The permanent magnet synchronous integrated machine energy recovery system applied to forklifts and stackers of the present invention includes a vehicle body with moving wheels, a cab is arranged at the top of the vehicle body, and a console for controlling the overall recovery system is arranged in the cab. It further includes: A lifting unit for raising or lowering the transported objects on forklifts and stackers, and an energy recovery unit for recovering energy when the lifting unit descends; The lifting unit is arranged on one side of the vehicle body, and the energy recovery unit is arranged on the outer surface of the lifting unit; The lifting unit includes a lifting outer frame, a roller frame is arranged at the top of the lifting outer frame, a chain is placed on the roller frame, one side of the chain is fixedly connected to a lifting table mechanism, a hydraulic mechanism is arranged at the end of the chain away from the lifting table mechanism, a side groove is arranged on the lifting outer frame, a first support column is arranged on the inner wall of the side groove, and a first gear is rotatably connected to the outer surface of the first support column. A central plate is arranged on the inner wall of the lifting outer frame; The lifting table mechanism is driven by the hydraulic mechanism to rise or fall through the roller frame and the chain. The side groove is arranged on the side of the lifting outer shell close to the energy recovery unit.

[0005] Preferably, the lifting table mechanism includes a lifting plate. A clamping block that is clamped with the central plate is arranged on the outer surface of the lifting plate, which restricts the lifting plate to move only up and down. A winding end in contact with the chain is arranged at the top of the lifting plate. A fork rack is arranged on the side of the lifting plate away from the clamping block. Tooth blocks meshing with the first gear are evenly arranged on the side of the lifting plate close to the side groove; The movement of the lifting plate will drive the first gear to rotate due to the engagement between the tooth block and the first gear.

[0006] Preferably, the bottom of the lifting outer frame is fixedly connected to the top of the vehicle body.

[0007] Preferably, the hydraulic mechanism includes an oil tank, a hydraulic press is arranged in the oil tank, a push rod is arranged at the output end of the hydraulic press, one end of a chain is in contact with the top of the push rod at the winding end two, controllers are symmetrically arranged on the top of the oil tank, a power supply and an electromagnetic plate that can transmit electricity through the power supply are arranged on the controllers, control valve mechanisms for controlling the pressure in the hydraulic press are symmetrically arranged on the hydraulic press, an oil inlet is arranged at the bottom of the hydraulic press, and an oil outlet is fixedly connected to the inner wall of the hydraulic press.

[0008] Preferably, the oil tank is arranged on the inner wall of the lifting outer frame, and the push rod moves up and down due to the pressure in the hydraulic press.

[0009] Preferably, the control valve mechanism includes a support valve housing, a second support column is arranged on the inner wall of the support valve housing, a first support plate is slidably connected to the outer surface of the second support column, the first support plate is made of a material with the same magnetism as the electromagnetic plate, a cylinder is arranged on one side of the first support plate, telescopic springs are symmetrically arranged on the side of the first support plate away from the cylinder, a valve core is fixedly connected to the outer surface of the cylinder away from the first support plate, and a partition is arranged in the middle of the inner wall of the support valve housing to prevent the side of the partition close to the valve housing and close to the telescopic spring from entering the hydraulic oil.

[0010] Preferably, the support valve housing is arranged in the middle of the hydraulic press and above the oil outlet, and the side of the telescopic spring away from the first support plate is fixedly connected to the inner wall of the support valve housing.

[0011] Preferably, the energy recovery unit includes an outer box, a third support column is rotatably connected to the top of the outer box, a second gear meshing with the first gear is arranged on the outer surface of the third support column, first discs are arranged on both sides of the third support column, a crawler is sleeved on the first discs, a fourth support column is rotatably connected to the bottom of the outer box, second discs are symmetrically arranged on both sides of the fourth support column, the second discs are sleeved with the crawler, a rotational speed sensor is arranged on the inner wall of the outer box, and an energy storage mechanism is arranged on the outer surface of the outer box.

[0012] Preferably, the energy storage mechanism includes a permanent magnet synchronous motor, which is connected to an inverter through a wire. A busbar plate I is provided on the inverter. An energy management controller is provided at one end of the busbar plate I away from the inverter. A bidirectional DCDC converter and an energy storage device are provided on the outer surface of the energy management controller. The energy management controller can control the bidirectional DCDC converter to store the back electromotive force energy on the DC bus into the energy storage device. A busbar plate II is provided at one end of the energy management controller away from the busbar plate I. A drive motor is provided at one end of the busbar plate II.

[0013] Preferably, the outer surface of the outer box is fixedly connected to the outer surface of the lifting outer frame. The output end of the permanent magnet synchronous motor is fixedly connected to one end of the support column IV. The output end of the drive motor is fixedly connected to one end of the support column III.

[0014] The beneficial effects of the present invention are as follows: 1. By setting the hydraulic mechanism in the present invention, the controller will increase the electric energy input to the electromagnet plate by the power supply, so that the repulsive force of the electromagnet plate on the support plate I increases. The tensile force of the telescopic spring will be less than the repulsive force, which will change the flow area of the oil passage inside the valve body. The flow area decreases, the hydraulic oil flow rate decreases, and the system pressure decreases accordingly, so that the descending speed slows down, avoiding the size and frequency fluctuations of the back electromotive force caused by unstable rotation speed, and further affecting the efficiency and stability of energy recovery.

[0015] 2. By setting the energy recovery unit in the present invention, the rack will engage with the gear I, so that the gear I rotates and drives the gear II and the support column III to rotate. Through the transmission of the disc I, the disc II and the crawler, the support column IV will be driven to rotate, thereby driving the rotor in the permanent magnet synchronous motor to rotate. The magnetic field generated by the permanent magnet on the rotating rotor rotates, and the coil on the stator will cut the rotating magnetic field, thereby generating a back electromotive force. In this process, the rotational speed sensor calculates the rotational speed of the motor by detecting the pulse signal generated by the toothed disc or magnet on the motor shaft. If the rotational speed is stable, an electrical signal will be transmitted to the control valve mechanism to control the descending speed.

[0016] 3. In the present invention, by providing an energy storage mechanism, the back electromotive force generated by the permanent magnet synchronous motor will feed the energy back to DC bus 1 through the inverter. Then, the energy management controller controls the bidirectional DCDC converter to store the back electromotive force energy on the DC bus into the energy storage device. When the forklift or stacker needs to rise or accelerate, the energy management controller controls the bidirectional DCDC converter to release the energy in the energy storage device to DC bus 2, and finally transfers it to the drive motor for use, providing additional power during lifting. During this process, the back electromotive force sensor obtains the magnitude of the back electromotive force by measuring the change in the motor output voltage. The back electromotive force sensor converts the collected analog signal into an electrical signal for the control valve mechanism. If the data fluctuates greatly, the control valve mechanism will be activated to start working. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the structural schematic diagram of the present invention.

[0018] Figure 2 is the front view of the structure of the present invention.

[0019] Figure 3 is the structural schematic diagram of the lifting unit of the present invention.

[0020] Figure 4 is the cross-sectional view of the structure of the lifting unit of the present invention.

[0021] Figure 5 is the structural schematic diagram of the lifting table mechanism of the present invention.

[0022] Figure 6 is the structural schematic diagram of the hydraulic mechanism of the present invention.

[0023] Figure 7 is the cross-sectional view of the structure of the hydraulic mechanism of the present invention.

[0024] Figure 8 is Figure 7 the enlarged view of part A in

[0025] Figure 9 is the structural schematic diagram of the energy recovery unit of the present invention.

[0026] Figure 10 is the structural schematic diagram of the energy storage mechanism of the present invention.

[0027] In the figure: 1, vehicle body; 2, moving wheels; 3, cab; 4, console; 5, lifting unit; 6, energy recovery unit; 51, outer lifting frame; 52, roller rack; 53, chain; 54, lifting table mechanism; 55, side groove; 56, hydraulic mechanism; 57, first support column; 58, first gear; 59, center plate; 541, lifting plate; 542, clamping block; 543, first winding end; 544, forklift carriage frame; 545, tooth block; 561, fuel tank; 562, hydraulic press; 563, push rod; 564, second winding end; 565, controller; 566, power supply; 567, electromagnetic plate; 568, control valve mechanism; 569, oil inlet; 5610, oil outlet; 5681, support valve housing; 5682, second support column; 5683, telescopic spring; 5684, first support plate; 5685, cylinder; 5686, valve core; 5687, partition plate; 61, outer box; 62, third support column; 63, second gear; 64, first disc; 65, crawler belt; 66, fourth support column; 67, second disc; 68, rotational speed sensor; 69, energy storage mechanism; 691, permanent magnet synchronous motor; 692, back electromotive force sensor; 693, wire; 694, inverter; 695, first bus bar; 696, energy management controller; 697, second bus bar; 698, drive motor; 699, bidirectional DCDC converter; 6910, energy storage device. Detailed implementation mode

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes. The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0029] Embodiment 1, use Figures 1 - 10 The permanent magnet synchronous integrated machine energy recovery system applied to forklifts and stackers according to an embodiment of the present invention will be described as follows.

[0030] As Figures 1 - 2 shown, the permanent magnet synchronous integrated machine energy recovery system applied to forklifts and stackers of the present invention includes a vehicle body 1 with moving wheels 2, a cab 3 is provided at the top of the vehicle body 1, and a console 4 for controlling the overall recovery system is provided in the cab 3. It further includes: a lifting unit 5 for raising or lowering the transported objects on forklifts and stackers, and an energy recovery unit 6 for recovering energy when the lifting unit 5 is lowered; The lifting unit 5 is provided on one side of the vehicle body 1, and the energy recovery unit 6 is provided on the outer surface of the lifting unit 5; When the present invention is working, the staff will control the lifting unit 5 to lift or lower the goods through the console 4. During the process of the lifting unit 5 descending, the energy recovery unit 6 will recover the electromotive force generated by the motor during the descent and convert it into energy to provide energy for the subsequent operation of the lifting unit 5.

[0031] As Figures 3 - 4 As shown in the figure, the lifting unit 5 includes a lifting outer frame 51. A roller frame 52 is provided at the top of the lifting outer frame 51. A chain 53 is placed on the roller frame 52. One side of the chain 53 is fixedly connected to a lifting table mechanism 54. A hydraulic mechanism 56 is provided at one end of the chain 53 away from the lifting table mechanism 54. A side groove 55 is provided on the lifting outer frame 51. A support column 57 is provided on the inner wall of the side groove 55. A first gear 58 is rotatably connected to the outer surface of the support column 57. A central plate 59 is provided on the inner wall of the lifting outer frame 51; When the hydraulic device works, it will pull or release the chain 53, thereby driving the lifting table mechanism 54 to rise or fall.

[0032] The lifting table mechanism 54 will be driven by the hydraulic mechanism 56 to rise or fall through the roller frame 52 and the chain 53. The side groove 55 is provided on one side of the lifting outer shell close to the energy recovery unit 6.

[0033] As Figure 5 As shown in the figure, the lifting table mechanism 54 includes a lifting plate 541. A clamping block 542 that is engaged with the central plate 59 is provided on the outer surface of the lifting plate 541, which restricts the lifting plate 541 to only move up and down. A winding end 543 that contacts the chain 53 is provided at the top of the lifting plate 541. A fork rack 544 is provided on one side of the lifting plate 541 away from the clamping block 542. Tooth blocks 545 that are engaged with the first gear 58 are evenly provided on one side of the lifting plate 541 close to the side groove 55; The movement of the lifting plate 541 will drive the first gear 58 to rotate due to the engagement of the tooth blocks 545 and the first gear 58.

[0034] The bottom of the lifting outer frame 51 is fixedly connected to the top of the vehicle body 1.

[0035] As Figures 6 - 7 As shown in the figure, the hydraulic mechanism 56 includes an oil tank 561. A hydraulic press 562 is provided in the oil tank 561. A push rod 563 is provided at the output end of the hydraulic press 562. A winding end 564 that contacts one end of the chain 53 is provided at the top of the push rod 563. Controllers 565 are symmetrically provided at the top of the oil tank 561. A power supply 566 and an electromagnet plate 567 that can transmit electricity through the power supply 566 are provided on the controller 565. Control valve mechanisms 568 that can control the pressure inside the hydraulic press 562 are symmetrically provided on the hydraulic press 562. An oil inlet 569 is provided at the bottom of the hydraulic press 562. An oil outlet 5610 is fixedly connected to the inner wall of the hydraulic press 562.

[0036] When the hydraulic press 562 drives the push rod 563 to move downward, it will pull the chain 53 to move, thereby driving the entire lifting platform mechanism 54 to move, and then driving the goods to move upward. However, when the lifting platform mechanism 54 moves downward, due to uneven weight of the goods, poor control of the descending speed, etc., the speed of the permanent magnet synchronous motor 691 may be unstable. At this time, the controller 565 will increase the electrical energy input by the power supply 566 to the electromagnetic plate 567.

[0037] The oil tank 561 is disposed on the inner wall of the lifting outer frame 51 , and the push rod 563 moves up and down due to the pressure in the hydraulic press 562 .

[0038] like Figure 8 As shown, the control valve mechanism 568 includes a supporting valve housing 5681, the inner wall of the supporting valve housing 5681 is provided with a supporting column 2 5682, the outer surface of the supporting column 2 5682 is slidably connected with a supporting plate 1 5684, the supporting plate 1 5684 is made of a material with the same magnetic properties as the electromagnetic plate 567, a cylinder 5685 is provided on one side of the supporting plate 1 5684, a telescopic spring 5683 is symmetrically provided on the side of the supporting plate 1 5684 away from the cylinder 5685, a valve core 5686 is fixedly connected to the outer surface of the cylinder 5685 away from the supporting plate 1 5684, and a partition 5687 is provided in the middle of the inner wall of the supporting valve housing 5681 to keep the side of the partition 5687 close to the telescopic spring 5683 of the valve housing from entering the hydraulic oil.

[0039] When the electric energy passed through the electromagnetic plate 567 increases, the repulsive force of the electromagnetic plate 567 on the support plate 5684 increases, and the pulling force of the telescopic spring 5683 will be smaller than the repulsive force, which will change the flow area of ​​the oil channel inside the valve body. The flow area will decrease, the hydraulic oil flow will decrease, and the system pressure will decrease accordingly, thereby slowing down the descent speed and avoiding the unstable speed that will cause the size and frequency fluctuations of the back electromotive force, thereby affecting the efficiency and stability of energy recovery.

[0040] The support valve housing 5681 is arranged in the middle of the hydraulic press 562 and located above the oil outlet 5610 , and the side of the telescopic spring 5683 away from the support plate 5684 is fixedly connected to the inner wall of the support valve housing 5681 .

[0041] The specific workflow is as follows: During operation, when lifting goods, as the hydraulic press 562 drives the push rod 563 to move downward, it will pull the chain 53 to move, thereby driving the overall lifting table mechanism 54 to move, and further driving the goods to move upward. On the contrary, when the hydraulic press 562 drives the push rod 563 to reset, the downward movement of the lifting table mechanism 54 will be realized. When the rotational speed of the permanent magnet synchronous motor 691 may be unstable, the controller 565 will cause the power supply 566 to increase the electrical energy input to the electromagnet plate 567, so that the repulsive force of the electromagnet plate 567 on the support plate 5684 increases. The pulling force of the telescopic spring 5683 will be less than the repulsive force, which will change the flow area of the oil passage inside the valve body. The flow area decreases, the hydraulic oil flow rate decreases, and the system pressure decreases accordingly, thereby slowing down the descending speed.

[0042] Embodiment 2, use Figures 1 - 10 The permanent magnet synchronous integrated machine energy recovery system applied to forklifts and stackers in one embodiment of the present invention will be described as follows.

[0043] As Figure 9 As shown, the permanent magnet synchronous integrated machine energy recovery system applied to forklifts and stackers of the present invention, on the basis of Embodiment 1, the energy recovery unit 6 includes an outer box 61. The top of the outer box 61 is rotatably connected to a support column 62. A gear 63 meshing with the gear 58 is arranged on the outer surface of the support column 62. Discs 64 are arranged on both sides of the support column 62. A crawler 65 is sleeved on the disc 64. The bottom of the outer box 61 is rotatably connected to a support column 66. Discs 67 are symmetrically arranged on both sides of the support column 66. The disc 67 is sleeved with the crawler 65. A rotational speed sensor 68 is arranged on the inner wall of the outer box 61. An energy storage mechanism 69 is arranged on the outer surface of the outer box 61.

[0044] During the downward movement of the lifting table mechanism 54, the rack will mesh with the gear 58, so that the gear 58 rotates and drives the gear 63 and the support column 62 to rotate. Through the transmission of the disc 64, the disc 67 and the crawler 65, the support column 66 will be driven to rotate, thereby driving the rotor in the permanent magnet synchronous motor 691 to rotate. The magnetic field generated by the permanent magnets on the rotating rotor rotates, and the coils on the stator will cut this rotating magnetic field, thereby generating a back electromotive force. In this process, the rotational speed sensor 68 calculates the rotational speed of the motor by detecting the pulse signal generated by the toothed disc or magnet on the motor shaft. If the rotational speed is stable, an electrical signal will be transmitted to the control valve mechanism 568 to control the downward movement speed.

[0045] As Figure 10As shown, the energy storage mechanism 69 includes a permanent magnet synchronous motor 691. The permanent magnet synchronous motor 691 is connected to an inverter 694 through a wire 693. A bus bar 695 is provided on the inverter 694. At one end of the bus bar 695 away from the inverter 694, an energy management controller 565 is provided. A bidirectional DCDC converter 699 and an energy storage device 6910 are provided on the outer surface of the energy management controller 565. The energy management controller 696 can control the bidirectional DCDC converter 699 to store the back electromotive force energy on the DC bus into the energy storage device 6910. At one end of the energy management controller 565 away from the bus bar 695, a bus bar 697 is provided. A drive motor 698 is provided at one end of the bus bar 697.

[0046] During the rotation of the moving support column 66, the back electromotive force generated by the permanent magnet synchronous motor 691 will feedback energy to the first DC bus through the inverter 694. Then, the energy management controller 696 controls the bidirectional DCDC converter 699 to store the back electromotive force energy on the DC bus into the energy storage device 6910. When the forklift or stacker needs to rise or accelerate, the energy management controller 696 controls the bidirectional DCDC converter 699 to release the energy in the energy storage device 6910 to the second DC bus and finally transmit it to the drive motor 698 for use, providing additional power during lifting. During this process, the back electromotive force sensor 692 obtains the magnitude of the back electromotive force by measuring the change in the motor output voltage. The back electromotive force sensor 692 converts the collected analog signal into an electrical signal and gives it to the control valve mechanism 568. If the data fluctuates greatly, the control valve mechanism 568 will be started to work.

[0047] The outer surface of the outer box 61 is fixedly connected to the outer surface of the lifting outer frame 51. The output end of the permanent magnet synchronous motor 691 is fixedly connected to one end of the support column 66. The output end of the drive motor 698 is fixedly connected to one end of the support column 62.

[0048] The specific working process is as follows: During operation, when the lifting table mechanism 54 descends, the rack engages with the first gear 58, causing the first gear 58 to rotate and driving the second gear 63 and the third support column 62 to rotate. Through the transmission of the first disc 64, the second disc 67, and the crawler 65, the fourth support column 66 is driven to rotate, which in turn drives the rotor in the permanent magnet synchronous motor 691 to rotate, generating a back electromotive force. The back electromotive force generated by the permanent magnet synchronous motor 691 is fed back to the first DC bus through the inverter 694. Subsequently, the energy management controller 696 controls the bidirectional DCDC converter 699 to store the back electromotive force energy on the DC bus in the energy storage device 6910. When the forklift or stacker needs to rise or accelerate, the energy management controller 696 controls the bidirectional DCDC converter 699 to release the energy in the energy storage device 6910 to the second DC bus and finally transmits it to the drive motor 698 for use, providing additional power during lifting.

[0049] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art without special instructions and limitations.

Claims

1. A permanent magnet synchronous integrated energy recovery system for forklifts and stackers, comprising a vehicle body with moving wheels, a cab is arranged on the top of the vehicle body, and a control console for controlling the overall recovery system is arranged in the cab, characterized in that: Also includes: Lifting units for raising or lowering transported objects on forklifts and stackers, and energy recovery units for recovering energy when the lifting units are lowered; The lifting unit is arranged on one side of the vehicle body, and the energy recovery unit is arranged on the outer surface of the lifting unit; The lifting unit comprises a lifting outer frame, a roller frame is arranged on the top of the lifting outer frame, a chain is placed on the roller frame, a lifting platform mechanism is fixedly connected to one side of the chain, a hydraulic mechanism is arranged at one end of the chain away from the lifting platform mechanism, a side groove is arranged on the lifting outer frame, a support column 1 is arranged on the inner wall of the side groove, a gear 1 is rotatably connected to the outer surface of the support column 1, and a center plate is arranged on the inner wall of the lifting outer frame; The lifting platform mechanism is driven to rise or fall by the hydraulic mechanism through the roller frame and the chain, and the side groove is arranged on a side of the lifting shell close to the energy recovery unit.

2. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 1 is characterized in that: The lifting platform mechanism includes a lifting plate, the outer surface of the lifting plate is provided with a blocking block engaged with the center plate, limiting the lifting plate to move up and down, the top of the lifting plate is provided with a winding end 1 in contact with the chain, a fork frame is provided on the side of the lifting plate away from the blocking block, and a tooth block meshing with a gear 1 is evenly provided on the side of the lifting plate close to the side groove; The movement of the lifting plate will drive the gear one to rotate due to the meshing of the gear block and the gear one.

3. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 2 is characterized in that: The bottom of the lifting outer frame is fixedly connected to the top of the vehicle body.

4. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 1 is characterized in that: The hydraulic mechanism includes an oil tank, a hydraulic press is arranged in the oil tank, a push rod is arranged at the output end of the hydraulic press, a winding end 2 which contacts one end of a chain is arranged on the top of the push rod, a controller is symmetrically arranged on the top of the oil tank, a power supply and an electromagnetic plate which can transmit electricity through the power supply are arranged on the controller, a control valve mechanism which can control the pressure in the hydraulic press is symmetrically arranged on the hydraulic press, an oil inlet is arranged at the bottom of the hydraulic press, and an oil outlet is fixedly connected to the inner wall of the hydraulic press.

5. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 4 is characterized in that: The oil tank is arranged on the inner wall of the lifting outer frame, and the push rod moves up and down due to the pressure in the hydraulic press.

6. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 4 is characterized in that: The control valve mechanism includes a supporting valve housing, an inner wall of the supporting valve housing is provided with supporting columns 2, an outer surface of the supporting columns 2 is slidably connected with a supporting plate 1, the supporting plate 1 is made of a material with the same magnetic properties as the electromagnetic plate, a cylinder is provided on one side of the supporting plate 1, a telescopic spring is symmetrically provided on the side of the supporting plate 1 away from the cylinder, a valve core is fixedly connected to the outer surface of the cylinder away from the supporting plate 1, and a partition is provided in the middle of the inner wall of the supporting valve housing for keeping the side of the partition close to the telescopic spring of the valve housing from entering the hydraulic oil.

7. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 6 is characterized in that: The support valve housing is arranged in the middle of the hydraulic press and is located above the oil outlet. The side of the telescopic spring away from the support plate is fixedly connected to the inner wall of the support valve housing.

8. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 1 is characterized in that: The energy recovery unit includes an outer box, the top of the outer box is rotatably connected to a support column three, the outer surface of the support column three is provided with a gear two meshing with a gear one, both sides of the support column three are provided with a disc one, and a track is mounted on the disc one, the bottom of the outer box is rotatably connected to a support column four, both sides of the support column four are symmetrically provided with a disc two, and the disc two is sleeved with the track, the inner wall of the outer box is provided with a speed sensor, and the outer surface of the outer box is provided with an energy storage mechanism.

9. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 8, characterized in that: The energy storage mechanism includes a permanent magnet synchronous motor, which is connected to an inverter through a wire. A busbar 1 is provided on the inverter. A capacity management controller is provided at one end of the busbar 1 away from the inverter. A bidirectional DCDC converter and an energy storage device are provided on the outer surface of the capacity management controller. The energy management controller can control the bidirectional DCDC converter to store the back electromotive force energy on the DC bus in the energy storage device. A busbar 2 is provided at one end of the capacity management controller away from the busbar 1, and a drive motor is provided at one end of the busbar 2.

10. The permanent magnet synchronous integrated energy recovery system for forklifts and stackers according to claim 9, characterized in that: The outer surface of the outer box is fixedly connected to the outer surface of the lifting outer frame, the output end of the permanent magnet synchronous motor is fixedly connected to one end of the support column four, and the output end of the drive motor is fixedly connected to one end of the support column three.

Images