Permanent magnet synchronous integrated energy recovery system applied to forklift or stacker

Abstract

The application discloses a permanent magnet synchronous integrated energy recovery system applied to a forklift or a stacker, relates to the field of motor control and energy recovery, and comprises a vehicle body provided with moving wheels, a cab arranged on the top of the vehicle body, and a console arranged in the cab and capable of controlling the whole recovery system, further comprising a lifting unit for lifting or lowering transported objects on the forklift or the stacker and an energy recovery unit 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 controls the lifting unit to lift or lower goods through the console; in the process of lowering the lifting unit, the energy recovery unit recovers the electric potential generated by the motor when the lifting unit is lowered and converts the electric potential into power, so as to provide energy for the work of the lifting unit.

Description

Technical Field

[0001] This invention relates to the field of motor control and energy recovery technology, specifically to an energy recovery system for permanent magnet synchronous integrated machines used in forklifts or stackers. Background Technology

[0002] Forklifts and stackers are widely used in the logistics and warehousing industries, and their lifting mechanisms are typically driven by hydraulic systems or electric motors. During the descent of goods, traditional hydraulic or electric drive systems convert potential energy into heat energy, resulting in energy waste. Permanent magnet synchronous motors (PMSMs), due to their high efficiency and high power density, are increasingly being used in forklift and stacker drive systems.

[0003] During the descent of forklifts and stackers, the speed of the permanent magnet synchronous motor may be unstable due to uneven weight distribution of goods or poor speed control. This unstable speed leads to fluctuations in the magnitude and frequency of the back electromotive force, thus affecting the efficiency and stability of energy recovery. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this invention is as follows: The energy recovery system for permanent magnet synchronous integrated machines applied to forklifts or stackers, as described in this invention, includes a vehicle body with moving wheels, a driver's cab mounted on the top of the vehicle body, a control console for operating the entire recovery system within the driver's cab, and further includes:

[0005] Lifting units that raise or lower transported goods on forklifts and stackers, and energy recovery units that recover energy when the lifting unit is lowered;

[0006] The lifting unit is located on one side of the vehicle body, and the energy recovery unit is located on the outer surface of the lifting unit.

[0007] The lifting unit includes a lifting outer frame, a roller frame is provided 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 provided at the end of the chain away from the lifting platform mechanism, a side groove is provided on the lifting outer frame, a support column is provided on the inner wall of the side groove, a gear is rotatably connected to the outer surface of the support column, and a center plate is provided on the inner wall of the lifting outer frame.

[0008] The lifting platform mechanism is driven to rise or fall by a hydraulic mechanism via a roller frame and chain, and the side groove is located on the side of the lifting shell near the energy recovery unit.

[0009] Preferably, the lifting platform mechanism includes a lifting plate, the outer surface of which is provided with a locking block that engages with the center plate, restricting the lifting plate to only move up and down, the top of which is provided with a winding end that contacts the chain, a fork carriage is provided on the side of the lifting plate away from the locking block, and toothed blocks that mesh with a gear are evenly provided on the side of the lifting plate near the side groove.

[0010] The movement of the lifting plate will cause the gear one to rotate due to the meshing of the toothed block and gear one.

[0011] Preferably, the bottom of the lifting outer frame is fixedly connected to the top of the vehicle body.

[0012] Preferably, the hydraulic mechanism includes an oil tank, a hydraulic press is installed inside the oil tank, a push rod is installed at the output end of the hydraulic press, a winding end of a chain is installed at the top of the push rod, a controller is symmetrically installed at the top of the oil tank, the controller is equipped with a power supply and an electromagnet that can transmit power through the power supply, a control valve mechanism that can control the pressure inside the hydraulic press is symmetrically installed on the hydraulic press, an oil inlet is installed at the bottom of the hydraulic press, and an oil outlet is fixedly connected to the inner wall of the hydraulic press.

[0013] Preferably, the oil tank is located on the inner wall of the lifting outer frame, and the push rod moves up and down due to the pressure inside the hydraulic press.

[0014] Preferably, the control valve mechanism includes a supporting valve housing, with a second supporting column on the inner wall of the supporting valve housing, and a first supporting plate slidably connected to the outer surface of the second supporting column. The first supporting plate is made of the same material as the solenoid plate. A cylinder is provided on one side of the first supporting plate, and telescopic springs are symmetrically arranged on the side of the first supporting plate away from the cylinder. A valve core is fixedly connected to the outer surface of the cylinder away from the first supporting plate, and a partition is provided in the middle of the inner wall of the supporting valve housing to prevent hydraulic oil from entering the side of the partition near the telescopic spring of the valve housing.

[0015] Preferably, the support valve housing is located in the middle of the hydraulic press and above the oil outlet, and the side of the telescopic spring away from the support plate is fixedly connected to the inner wall of the support valve housing.

[0016] Preferably, the energy recovery unit includes an outer casing, with a support column three rotatably connected to the top of the outer casing. A gear two meshes with a gear one on the outer surface of the support column three. A disc one is provided on both sides of the support column three, and a track is fitted on the disc one. A support column four is rotatably connected to the bottom of the outer casing. Disc two is symmetrically arranged on both sides of the support column four, and the disc two is fitted with the track. A speed sensor is provided on the inner wall of the outer casing, and an energy storage mechanism is provided on the outer surface of the outer casing.

[0017] Preferably, the energy storage mechanism includes a permanent magnet synchronous motor, which is connected to an inverter via wires. The inverter is provided with a bus plate one, and an energy management controller is provided at the end of the bus plate one away from the inverter. The outer surface of the energy management controller is provided with a bidirectional DC-DC converter and an energy storage device. The energy management controller can control the bidirectional DC-DC converter to store the back EMF energy on the DC bus into the energy storage device. A bus plate two is provided at the end of the energy management controller away from the bus plate one, and a drive motor is provided at the end of the bus plate two.

[0018] Preferably, the outer surface of the outer casing 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.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. This invention, by setting up a hydraulic mechanism, allows the controller to increase the electrical energy supplied to the solenoid plate, thereby increasing the repulsive force of the solenoid plate on the support plate. The tension of the extension spring will then 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, thus slowing down the descent speed. This avoids fluctuations in the magnitude and frequency of the back electromotive force caused by unstable rotation speed, which would affect the efficiency and stability of energy recovery.

[0021] 2. This invention, through the setting of a capacity recovery unit, causes the rack to mesh with gear one, thereby causing gear one to rotate and driving gear two and support column three to rotate. Through the transmission of disk one, disk two and track, support column four will then 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. During this process, the speed sensor calculates the motor speed by detecting the pulse signal generated by the gear disk or magnet on the motor shaft. If the speed is stable, it will transmit an electrical signal to the control valve mechanism to control the downward speed.

[0022] 3. This invention incorporates an energy storage mechanism. The back EMF generated by the permanent magnet synchronous motor is fed back to DC bus one via an inverter. The energy management controller then controls a bidirectional DC-DC converter to store the back EMF 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 DC-DC converter to release the energy from the storage device to DC bus two, ultimately transferring it to the drive motor for use, providing additional power during lifting. During this process, the back EMF sensor measures the change in the motor's output voltage to obtain the magnitude of the back EMF. The back EMF sensor converts the collected analog signal into an electrical signal and sends it to the control valve mechanism. If the data fluctuation is large, the control valve mechanism will be activated and begin operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a front view of the structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the lifting unit of the present invention.

[0026] Figure 4 This is a cross-sectional view of the lifting unit of the present invention.

[0027] Figure 5 This is a schematic diagram of the lifting platform mechanism of the present invention.

[0028] Figure 6 This is a schematic diagram of the hydraulic mechanism of the present invention.

[0029] Figure 7 This is a structural cross-sectional view of the hydraulic mechanism of the present invention.

[0030] Figure 8 yes Figure 7 Enlarged view of point A in the middle.

[0031] Figure 9 This is a schematic diagram of the energy recovery unit of the present invention.

[0032] Figure 10 This is a schematic diagram of the energy storage mechanism of the present invention.

[0033] In the diagram: 1. Vehicle body; 2. Casters; 3. Cab; 4. Control console; 5. Lifting unit; 6. Energy recovery unit; 51. Lifting frame; 52. Roller frame; 53. Chain; 54. Lifting platform mechanism; 55. Side groove; 56. Hydraulic mechanism; 57. Support column one; 58. Gear one; 59. Center plate; 541. Lifting plate; 542. Locking block; 543. Winding end one; 544. Fork carriage; 545. Gear block; 561. Oil tank; 562. Hydraulic press; 563. Push rod; 564. Winding end two; 565. Controller; 566. Power supply; 567. Electromagnetic plate; 568. Control valve mechanism; 569. Oil inlet; 5610. Oil outlet; 5681. Valve housing support; 5682. Support column two; 5683. Telescopic spring; 5684. Support plate one; 5685. Cylindrical column; 5686. Valve core; 5687. Partition plate; 61. Outer casing; 62. Support column three; 63. Gear two; 64. Disc one; 65. Track; 66. Support column four; 67. Disc two; 68. Speed ​​sensor; 69. Energy storage mechanism; 691. Permanent magnet synchronous motor; 692. Back EMF sensor; 693. Wire; 694. Inverter; 695. Busbar one; 696. Energy management controller; 697. Busbar two; 698. Drive motor; 699. Bidirectional DC-DC converter; 6910. Energy storage device. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0035] Example 1, using Figures 1-10 The following describes an embodiment of the energy recovery system of the permanent magnet synchronous integrated machine applied to forklifts or stackers according to the present invention.

[0036] like Figures 1-2 As shown, the energy recovery system of the present invention, applied to a permanent magnet synchronous integrated machine for forklifts or stackers, includes a vehicle body 1 with moving wheels 2, a driver's cab 3 on the top of the vehicle body 1, a control console 4 for operating the entire recovery system inside the driver's cab 3, and further includes:

[0037] Lifting unit 5 for raising or lowering transported goods on forklifts and stackers, and energy recovery unit 6 for recovering energy when lifting unit 5 is lowered;

[0038] The lifting unit 5 is located on one side of the vehicle body 1, and the energy recovery unit 6 is located on the outer surface of the lifting unit 5.

[0039] When the present invention is in operation, the staff will control the lifting unit 5 to lift or lower the goods through the control console 4. During the process of lifting unit 5 being unloaded, 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 lifting unit 5.

[0040] like Figures 3-4 As shown, the lifting unit 5 includes a lifting outer frame 51, a roller frame 52 is provided on the top of the lifting outer frame 51, a chain 53 is placed on the roller frame 52, a lifting platform mechanism 54 is fixedly connected to one side of the chain 53, a hydraulic mechanism 56 is provided at the end of the chain 53 away from the lifting platform 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 gear 58 is rotatably connected to the outer surface of the support column 57, and a center plate 59 is provided on the inner wall of the lifting outer frame 51.

[0041] When the hydraulic device is working, it pulls or releases the chain 53, thereby driving the lifting platform mechanism 54 to rise or fall.

[0042] The lifting platform mechanism 54 is driven to rise or fall by the hydraulic mechanism 56 via the roller frame 52 and the chain 53. The side groove 55 is located on the side of the lifting shell close to the energy recovery unit 6.

[0043] like Figure 5 As shown, the lifting platform mechanism 54 includes a lifting plate 541. The outer surface of the lifting plate 541 is provided with a locking block 542 that engages with the center plate 59, which restricts the lifting plate 541 to only move up and down. The top of the lifting plate 541 is provided with a winding end 543 that contacts the chain 53. A fork carriage 544 is provided on the side of the lifting plate 541 away from the locking block 542. Tooth blocks 545 that mesh with gear 58 are evenly provided on the side of the lifting plate 541 near the side groove 55.

[0044] The movement of the lifting plate 541 will cause the gear 58 to rotate due to the meshing of the tooth block 545 and the gear 58.

[0045] The bottom of the raised outer frame 51 is fixedly connected to the top of the vehicle body 1.

[0046] like Figures 6-7As shown, the hydraulic mechanism 56 includes an oil tank 561, a hydraulic press 562 is installed inside the oil tank 561, a push rod 563 is installed at the output end of the hydraulic press 562, a winding end 564 of a chain 53 is installed at the top of the push rod 563, a controller 565 is symmetrically arranged at the top of the oil tank 561, a power supply 566 and an electromagnet 567 that can transmit power through the power supply 566 are installed on the controller 565, a control valve mechanism 568 that can control the pressure inside the hydraulic press 562 is symmetrically arranged on the hydraulic press 562, an oil inlet 569 is installed at the bottom of the hydraulic press 562, and an oil outlet 5610 is fixedly connected to the inner wall of the hydraulic press 562.

[0047] When 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 platform mechanism 54 to move, and then driving the goods to move upward. However, when the lifting platform mechanism 54 moves downward, the speed of the permanent magnet synchronous motor 691 may be unstable due to uneven weight of the goods, poor control of the descent speed, etc. At this time, the controller 565 will increase the electrical energy supplied by the power supply 566 to the solenoid plate 567.

[0048] The oil tank 561 is located on the inner wall of the lifting frame 51, and the push rod 563 will move up and down due to the pressure inside the hydraulic press 562.

[0049] like Figure 8 As shown, the control valve mechanism 568 includes a supporting valve housing 5681. A second supporting column 5682 is provided on the inner wall of the supporting valve housing 5681. A first supporting plate 5684 is slidably connected to the outer surface of the second supporting column 5682. The first supporting plate 5684 is made of the same material as the solenoid plate 567. A cylinder 5685 is provided on one side of the first supporting plate 5684. A telescopic spring 5683 is symmetrically provided on the side of the first supporting plate 5684 away from the cylinder 5685. A valve core 5686 is fixedly connected to the outer surface of the cylinder 5685 away from the first supporting plate 5684. 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 near the valve housing and close to the telescopic spring 5683 from entering the hydraulic oil.

[0050] When the electrical energy supplied to the solenoid plate 567 increases, the repulsive force of the solenoid plate 567 on the support plate 5684 increases. The tension of the extension 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 decreases, and the system pressure decreases accordingly. This slows down the descent speed and avoids fluctuations in the magnitude and frequency of the back electromotive force caused by unstable rotation speed, which would affect the efficiency and stability of energy recovery.

[0051] The support valve housing 5681 is located in the middle of the hydraulic press 562 and above the oil outlet 5610. The side of the extension spring 5683 away from the support plate 5684 is fixedly connected to the inner wall of the support valve housing 5681.

[0052] The specific workflow is as follows:

[0053] During operation, when lifting goods, the hydraulic press 562 drives the push rod 563 downward, which pulls the chain 53 to move, thereby moving the overall lifting platform mechanism 54 and thus moving the goods upward. Conversely, when the hydraulic press 562 drives the push rod 563 to reset, the lifting platform mechanism 54 moves downward. When the speed of the permanent magnet synchronous motor 691 is unstable, the controller 565 will increase the electrical energy supplied by the power supply 566 to the solenoid plate 567, thereby increasing the repulsive force of the solenoid plate 567 on the support plate 5684. The tension of the extension 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 decreases, the system pressure decreases accordingly, and thus the descent speed slows down.

[0054] Example 2, using Figures 1-10 The following describes an embodiment of the energy recovery system of the permanent magnet synchronous integrated machine applied to forklifts or stackers according to the present invention.

[0055] like Figure 9 As shown, the energy recovery system of the present invention, applied to a permanent magnet synchronous integrated machine for forklifts or stackers, is based on Embodiment 1. The energy recovery unit 6 includes an outer box 61. The top of the outer box 61 is connected to a support column 3 62. The outer surface of the support column 3 62 is provided with a gear 2 63 that meshes with a gear 1 58. The two sides of the support column 3 62 are provided with a disc 1 64. A track 65 is fitted on the disc 1 64. The bottom of the outer box 61 is rotatably connected to a support column 4 66. The two sides of the support column 4 66 are symmetrically provided with disc 2 67. The disc 2 67 is fitted with the track 65. The inner wall of the outer box 61 is provided with a speed sensor 68. The outer surface of the outer box 61 is provided with an energy storage mechanism 69.

[0056] During the downward movement of the lifting platform mechanism 54, the rack meshes with gear 58, causing gear 58 to rotate and drive gear 63 and support column 62 to rotate. Through the transmission of disk 64, disk 67 and track 65, support column 66 is driven to rotate, thereby driving the rotor in permanent magnet synchronous motor 691 to rotate. The magnetic field generated by the permanent magnet on the rotating rotor rotates, and the coil on the stator cuts the rotating magnetic field, thereby generating a back electromotive force. During this process, the speed sensor 68 calculates the motor speed by detecting the pulse signal generated by the gear or magnet on the motor shaft. If the speed is stable, it transmits an electrical signal to the control valve mechanism 568 to control the downward movement speed.

[0057] like Figure 10 As shown, the energy storage mechanism 69 includes a permanent magnet synchronous motor 691, which is connected to an inverter 694 via a wire 693. A busbar 695 is provided on the inverter 694. An energy management controller 696 is provided at the end of the busbar 695 away from the inverter 694. A bidirectional DC-DC converter 699 and an energy storage device 6910 are provided on the outer surface of the energy management controller 696. The energy management controller 696 can control the bidirectional DC-DC converter 699 to store the back EMF energy on the DC bus into the energy storage device 6910. A second busbar 697 is provided at the end of the energy management controller 696 away from the first busbar 695. A drive motor 698 is provided at the end of the second busbar 697.

[0058] During the rotation of the four-axis moving support column 66, the back EMF generated by the permanent magnet synchronous motor 691 is fed back to the DC bus 1 via the inverter 694. Then, the energy management controller 696 controls the bidirectional DC-DC converter 699 to store the back EMF 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 DC-DC converter 699 to release the energy in the energy storage device 6910 to the DC bus 2, and finally transmits it to the drive motor 698 for use, providing additional power for lifting. During this process, the back EMF sensor 692 obtains the magnitude of the back EMF by measuring the change in the motor output voltage. The back EMF sensor 692 converts the collected analog signal into an electrical signal and sends it to the control valve mechanism 568. If the data fluctuation is large, the control valve mechanism 568 will be activated to start working.

[0059] The outer surface of the outer casing 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 four 66, and the output end of the drive motor 698 is fixedly connected to one end of the support column three 62.

[0060] The specific workflow is as follows:

[0061] During operation, when the lifting platform mechanism 54 descends, the rack meshes with gear 58, causing gear 58 to rotate and drive gear 63 and support column 62 to rotate. Through the transmission of disc 64, disc 67 and track 65, the support column 66 is driven to rotate, which in turn drives the rotor in permanent magnet synchronous motor 691 to rotate, thereby generating a back EMF. The back EMF generated by permanent magnet synchronous motor 691 feeds energy back to DC bus 1 through inverter 694. Then, energy management controller 696 controls bidirectional DC-DC converter 699 to store the back EMF energy on DC bus into energy storage device 6910. When the forklift or stacker needs to rise or accelerate, energy management controller 696 controls bidirectional DC-DC converter 699 to release the energy in energy storage device 6910 to DC bus 2, and finally transmits it to drive motor 698 for use, providing additional power for lifting.

[0062] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A permanent magnet synchronous integrated energy recovery system applied to a forklift or a stacker, comprising a vehicle body with moving wheels, a cab is arranged on the top of the vehicle body, a control console capable of controlling the whole recovery system is arranged in the cab, characterized in that, Also include: The lifting unit on the forklift and the stacker truck to lift or lower the transported goods, and the energy recovery unit to recover 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; The lifting unit comprises a lifting outer frame, a roller frame is arranged at the top of the lifting outer frame, a chain is arranged on the roller frame, one side of the chain is fixedly connected with a lifting platform mechanism, one end of the chain away from the lifting platform mechanism is provided with a hydraulic mechanism, a side groove is arranged on the lifting outer frame, a supporting column one is arranged on the inner wall of the side groove, a gear one is rotatably connected to the outer surface of the supporting column one, 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 one side of the lifting outer shell close to the energy recovery unit; The hydraulic mechanism comprises an oil tank, a hydraulic machine is arranged in the oil tank, a push rod is arranged at the output end of the hydraulic machine, a winding end two of the chain is arranged at the top of the push rod and contacts one end of the chain, a controller is symmetrically arranged at the top of the oil tank, a power supply and an energized electromagnetic plate capable of transmitting power through the power supply are arranged on the controller, a control valve mechanism capable of controlling the pressure in the hydraulic machine is symmetrically arranged on the hydraulic machine, an oil inlet is arranged at the bottom of the hydraulic machine, and an oil outlet is fixedly connected to the inner wall of the hydraulic machine; The control valve mechanism comprises a support valve shell, a supporting column two is arranged on the inner wall of the support valve shell, a supporting plate one is slidably connected to the outer surface of the supporting column two, the supporting plate one is composed of a material with the same magnetic property as the energized electromagnetic plate, a cylinder is arranged on one side of the supporting plate one, extension springs are symmetrically arranged on the side of the supporting plate one away from the cylinder, a valve core is fixedly connected to the outer surface of the cylinder away from the supporting plate one, and a partition plate is arranged in the middle of the inner wall of the support valve shell, so as to keep the side of the partition plate close to the support valve shell and away from the extension spring from entering the hydraulic oil.

2. The energy recovery system for a forklift or a reach truck permanent magnet synchronous integrated machine according to claim 1, characterized in that: The lifting platform mechanism comprises a lifting plate, a clamping block is arranged on the outer surface of the lifting plate and clamped with the center plate, so that the lifting plate can only move up and down, a winding end one is arranged on the top of the lifting plate and contacts the chain, a fork frame is arranged on the side of the lifting plate away from the clamping block, and tooth blocks engaged with the gear one are uniformly arranged on the side of the lifting plate close to the side groove; The movement of the lifting plate will cause the gear one to rotate due to the engagement of the tooth blocks and the gear one.

3. The energy recovery system for a forklift or a reach truck permanent magnet synchronous integrated machine according to claim 2, characterized in that: The bottom of the lifting outer frame is fixedly connected with the top of the vehicle body.

4. The permanent magnet synchronous integrated energy recovery system for a forklift or a lift truck of claim 1, wherein: 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 machine.

5. The permanent magnet synchronous integrated energy recovery system for a forklift or a lift truck of claim 1, wherein: The support valve shell is arranged in the middle of the hydraulic machine and above the oil outlet, and the side of the extension spring away from the supporting plate one is fixedly connected with the inner wall of the support valve shell.

6. The permanent magnet synchronous integrated energy recovery system for a forklift or a lift truck of claim 1, wherein: The energy recovery unit includes an outer box, the top of the outer box is connected with a support column three, the outer surface of the support column three is provided with a gear two engaged with a gear one, the two sides of the support column three are provided with a disc one, the disc one is sleeved with a track, the bottom of the outer box is rotationally connected with a support column four, the two sides of the support column four are symmetrically provided with a disc two, the disc two is sleeved with the track, the inner wall of the outer box is provided with a rotating speed sensor, and the outer surface of the outer box is provided with an energy storage mechanism.

7. The application of the permanent magnet synchronous integrated energy recovery system for the forklift or the stacker truck of claim 6, wherein: The energy storage mechanism includes a permanent magnet synchronous motor, the permanent magnet synchronous motor is connected with an inverter through wires, the inverter is provided with a busbar plate one, the end of the busbar plate one away from the inverter is provided with an energy management controller, the outer surface of the energy management controller is provided with a bidirectional DCDC converter and an energy storage device, 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, the end of the energy management controller away from the busbar plate one is provided with a busbar plate two, and one end of the busbar plate two is provided with a driving motor.

8. The application of the permanent magnet synchronous integrated energy recovery system for the fork truck or the stacker truck of claim 7, wherein: The outer surface of the outer box is fixedly connected with the outer surface of the lifting outer frame, the output end of the permanent magnet synchronous motor is fixedly connected with one end of the support column four, and the output end of the driving motor is fixedly connected with one end of the support column three.

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