Movable hydraulic turnover machine with energy recovery

Abstract

The application discloses a movable hydraulic turnover machine with energy recovery, which comprises a movable base, a sending-end turnover table, a receiving-end turnover table, an energy-saving hydraulic system and an electric control panel. The sending-end turnover table and the receiving-end turnover table are oppositely matched to complete workpiece turnover. The energy-saving hydraulic system comprises a hydraulic power unit, a sending-end oil cylinder, a receiving-end oil cylinder, a recovery switching valve, an accumulator, a proportional throttle valve, a hydraulic motor, a generator, an energy storage unit and an inverter. The recovery switching valve is connected between the oil return port of the receiving-end oil cylinder and the oil inlet of the hydraulic motor. The accumulator is connected in parallel to the recovery oil circuit. The generator is connected to the energy storage unit through a rectifier and a bidirectional DC / DC converter. The energy storage unit is connected to the motor of the hydraulic power unit through the inverter. When the turnover table is descending, the accumulator is used for buffering, and the hydraulic motor is used for generating electricity to charge the energy storage unit. When the turnover table is ascending, the energy storage unit is used for power supply and the accumulator is used for energy release to double auxiliary drive. Energy recovery and reuse are realized, energy-saving effect is good, and the turnover machine runs stably and reliably.

Description

Technical Field

[0001] This invention relates to the field of flipping equipment technology, specifically to a mobile hydraulic flipping machine with energy recovery, suitable for flipping operations of large plates, molds and other workpieces in processing, assembly, welding and other processes. Background Technology

[0002] In the field of mechanical manufacturing, large box-shaped, sheet metal, and mold-shaped workpieces often require flipping during processing, assembly, and welding due to their large size and weight, in order to facilitate the processing of all sides of the workpieces. Because of the large size and weight of the workpieces, manual flipping is difficult, inefficient, and poses significant safety hazards; therefore, specialized flipping equipment is required to complete the operation.

[0003] Existing turning machines are mainly divided into two types according to their transmission methods: chain-driven turning machines and hydraulic-driven turning machines. Chain-driven turning machines consist of a chain-type turning table, a chain drive mechanism, rollers, and a base. Their disadvantages include clearances in the chain drive, unstable operation, and occasional tooth slippage on the sprockets under heavy loads. Therefore, chain drives are generally not used in large-tonnage turning machines. Hydraulic-driven turning machines consist of a hydraulic turning table, a hydraulic transmission system, bearing seats, and a base. They offer advantages such as smooth transmission, easy shock absorption, and stepless speed regulation. However, existing hydraulic turning machines still have several shortcomings:

[0004] Firstly, the equipment is inconvenient to move. Most turnover equipment has a fixed structure, which cannot be moved flexibly to different locations, making it difficult to adapt to the flexible production needs of multiple workstations and cross-workshops. When it is necessary to move the equipment between different workstations, it is often necessary to use hoisting equipment or forklifts for handling, which is cumbersome and inefficient.

[0005] Secondly, there are safety hazards in the workpiece handover process. In situations requiring a 180° rotation, some existing equipment uses two 90° rotations to complete the task. The workpiece needs to be re-clamped or hoisted between these rotations, a complex process with a risk of falling. Even equipment with a double-rotating-table structure often uses a simple lifting method for workpiece handover, lacking a reliable support structure. This makes it easy for the workpiece to slip due to a shift in the center of gravity or unstable support, affecting operational safety.

[0006] Third, the hydraulic system suffers from severe energy waste. In existing hydraulic tilting machines, gravitational potential energy is typically lost during workpiece descent by being directly released through the relief valve, failing to be effectively recovered and utilized. This not only wastes energy but also causes severe overheating in the hydraulic system, accelerating oil aging and shortening the equipment's lifespan.

[0007] Fourth, the tilting motion has a large impact. Existing hydraulic tilting machines lack a smooth speed regulation structure, resulting in a large impact during the tilting motion, which can easily damage the workpiece surface and the equipment structure, affecting processing quality and equipment lifespan.

[0008] To address the aforementioned issues, some existing technologies attempt to achieve energy recovery by adding accumulators to the hydraulic system. For example, patent document CN115893261A discloses an energy-storing 90° tilting device that uses an accumulator to store energy during the tilting process. However, such solutions only employ a single energy storage method with an accumulator, resulting in a limited energy recovery method and energy storage density, failing to achieve efficient energy storage and flexible allocation. Some documents also disclose technical solutions for potential energy recovery using hydraulic motors to drive generators in construction machinery (such as excavators and forklifts), but there is no precedent for organically combining this with the accumulator buffer structure and the dual-tilting-table relay tilting method of a tilting machine. Summary of the Invention

[0009] This invention provides a mobile hydraulic tilting machine with energy recovery. It achieves flexible relocation through a movable base, safe tilting through segmented relay of dual tilting platforms, and efficient recovery and reuse of declining potential energy through a composite energy recovery system of "accumulator buffer + proportional throttling speed regulation + hydraulic motor power generation + energy storage unit storage + inverter reuse". This effectively solves the problems existing in the above-mentioned prior art.

[0010] The technical solution adopted in this invention is as follows: a mobile hydraulic tilting machine with energy recovery, comprising a mobile base, a feeding tilting table, a receiving tilting table, an energy-saving hydraulic system, and an electrical control panel;

[0011] Both the feeding end flipping table and the receiving end flipping table are mounted on the movable base, and the two cooperate with each other to complete the workpiece flipping in a segmented relay manner.

[0012] The energy-saving hydraulic system includes a hydraulic power unit, a feed cylinder, a receiving cylinder, a recovery switching valve, an accumulator, a check valve group, a proportional throttle valve, a pressure sensor, a hydraulic motor, a generator, a rectifier, a bidirectional DC / DC converter, an inverter, and an energy storage unit.

[0013] The feeding end cylinder is connected between the feeding end tilting table and the movable base, and is used to drive the feeding end tilting table to tilt; the receiving end cylinder is connected between the receiving end tilting table and the movable base, and is used to drive the receiving end tilting table to tilt.

[0014] The recovery switching valve is connected between the return port of the terminal cylinder and the inlet port of the hydraulic motor, and has a recovery station and a normal return station.

[0015] The accumulator is connected in parallel to the recovery oil circuit between the recovery switching valve and the hydraulic motor via the one-way valve group;

[0016] The proportional throttle valve is located on the oil inlet side of the hydraulic motor;

[0017] The pressure sensor is installed in the inlet pipe of the accumulator;

[0018] The hydraulic motor is coaxially connected to the generator, and the generator is sequentially electrically connected to the rectifier, the bidirectional DC / DC converter, and the energy storage unit. The energy storage unit is electrically connected to the main motor of the hydraulic power unit via the inverter.

[0019] The electronic control panel controls the recovery switching valve to switch to the recovery position during the descent condition. The pressurized oil discharged from the terminal cylinder passes through the recovery oil circuit and is buffered by the accumulator before entering the hydraulic motor through the proportional throttle valve to drive the generator to generate electricity and charge the energy storage unit. During the ascent condition, the energy storage unit supplies power to the hydraulic power unit through the inverter. At the same time, the accumulator releases energy to the oil inlet circuit of the terminal cylinder through the one-way valve group, driving the terminal tilting platform to rise in a dual-aid manner.

[0020] Furthermore, the hydraulic power unit includes a directional valve and a balance valve; the directional valve is disposed between the hydraulic pump and the delivery cylinder and the receiving cylinder, and is used to control the hydraulic oil to selectively enter the delivery cylinder or the receiving cylinder; the balance valve is respectively disposed between the delivery cylinder and the directional valve and between the receiving cylinder and the directional valve, and the balance valve is used to limit the return oil flow when the tilting platform descends, so as to prevent the tilting platform from stalling and sliding down.

[0021] Furthermore, the recovery switching valve is a two-position three-way solenoid valve, which is automatically switched by the electronic control panel according to the power of the energy storage unit.

[0022] Furthermore, the accumulator is a bladder-type or piston-type accumulator, and its pre-charge pressure is 60% to 80% of the system's rated working pressure; the inlet pipeline of the accumulator is equipped with an unloading valve and a safety valve.

[0023] Furthermore, the one-way valve assembly includes a filling one-way valve and a draining one-way valve; the filling one-way valve is located between the accumulator inlet and the recovery oil circuit, and the draining one-way valve is located between the accumulator outlet and the oil inlet circuit of the terminal cylinder.

[0024] Furthermore, the electronic control panel integrates lifting mode, descent recovery mode, energy storage auxiliary mode, normal oil return mode, and fault unloading mode; in lifting mode, the energy storage unit and the accumulator work together to assist in driving; in descent recovery mode, the recovery switching valve switches to the recovery position; in energy storage auxiliary mode, only the accumulator participates in buffering and energy release; in normal oil return mode, the recovery switching valve switches to the normal oil return position; in fault unloading mode, the system is unloaded for protection.

[0025] Furthermore, the electronic control panel also integrates an emergency stop function. During an emergency stop, the reversing valve is locked in the neutral position, and the recovery switching valve is switched to the normal oil return position.

[0026] Furthermore, the flipping axes of the feeding end flipping table and the receiving end flipping table are parallel to each other; the feeding end flipping table and the receiving end flipping table are respectively provided with multiple support plates, and the support plates on both sides are staggered and arranged in a "7" shape.

[0027] Furthermore, the segmented relay method is as follows: the receiving end flipping table first rises to a first preset angle greater than 80° and less than 90°, and the sending end flipping table carries the workpiece to a second preset angle greater than 90° and not greater than 100°; the workpiece on the sending end flipping table is transferred to the receiving end flipping table, and the receiving end flipping table then flips to the bottom surface of the workpiece facing upwards.

[0028] Furthermore, the bottom of the movable base is provided with detachable casters, and after the casters are removed, the bottom surface of the movable base is in contact with the ground for support.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) This invention adopts a composite energy recovery structure of "accumulator buffer energy storage + proportional throttle valve precise speed regulation + hydraulic motor power generation + energy storage unit storage + inverter reuse", which replaces the energy waste caused by the direct pressure relief of the overflow valve in the descent mode of the traditional tilting machine. In the descent mode, the pressure oil discharged from the drive cylinder is buffered and stabilized by the accumulator to drive the hydraulic motor to rotate. The hydraulic motor drives the generator to generate electricity. The electrical energy is rectified and converted into bidirectional DC / DC and then stored in the energy storage unit. In the ascending mode, the energy storage unit releases electrical energy and supplies it to the main motor of the hydraulic power unit after inversion. At the same time, the accumulator releases the stored hydraulic energy to the oil inlet of the drive cylinder, forming a dual auxiliary drive mode of "electric energy assistance + hydraulic energy assistance". This closed-loop energy cycle eliminates the overflow energy loss in the descent mode of the traditional tilting machine, and the energy saving effect is outstanding.

[0031] (2) This invention incorporates an accumulator in the recovery oil circuit to absorb the instantaneous pressure shock during the initial descent, preventing damage caused by direct impact of pressurized oil on the hydraulic motor. Simultaneously, a proportional throttle valve precisely regulates the flow rate of pressurized oil into the hydraulic motor, coupled with real-time feedback from a pressure sensor, ensuring the hydraulic motor maintains a stable speed throughout the descent process. This achieves a uniform and smooth descent of the tilting platform, effectively preventing impact and speed creep, and protecting the workpiece surface and equipment structure. Furthermore, a balance valve between the drive cylinder and the directional valve prevents the tilting platform from stalling and sliding due to the workpiece's own weight, further ensuring operational safety.

[0032] (3) This invention employs a staggered arrangement of a feeding end tilting table and a receiving end tilting table to achieve 180° rotation through a segmented relay method. The receiving end tilting table first rises to a first preset angle greater than 80° and less than 90° and hovers there. The feeding end tilting table carries the workpiece to a second preset angle greater than 90° and less than 100°, after which the workpiece is transferred to the receiving end tilting table, completing the safe relay transfer. The multi-point surface contact structure of the support plate relies on surface contact and the workpiece's own weight to achieve stable support, effectively avoiding the risk of workpiece slippage caused by center of gravity shift and unstable support in traditional simple lifting methods.

[0033] (4) The movable base of this invention adopts a frame steel structure welded from square steel, and the bottom can be detachably installed with movable casters through a pin-type structure. When the equipment is transported, the pins are inserted to fix the casters, so that the whole machine can be flexibly pushed or transported; after reaching the work position, the pins are pulled out to quickly remove the movable casters, and the bottom surface of the base frame directly contacts the ground for support, ensuring that the operation process is stable and reliable, without shaking or displacement. This structure takes into account both the flexible transportation of equipment and the stability of operation, and effectively adapts to the flexible production needs of multiple work positions and cross-workshops.

[0034] (5) The electronic control panel of this invention integrates five control modes: lifting mode, lowering and recovery mode, energy storage auxiliary mode, normal oil return mode, and fault unloading mode. It can automatically switch the working position of the recovery switching valve according to the power status of the energy storage unit and the working conditions, so as to realize intelligent energy management. At the same time, the electronic control panel also integrates limit protection and emergency stop functions. In the event of an emergency stop, the directional valve is locked in the neutral position, the recovery switching valve is switched to the normal oil return position, and the hydraulic system enters a safe lock-up state to ensure the safety of personnel and equipment. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the mobile hydraulic tilting machine with energy recovery according to the present invention;

[0036] Figure 2 This is a schematic diagram of the energy-saving hydraulic system of the present invention;

[0037] Figure 3 This is a timing diagram of the flipping relay process of the present invention.

[0038] The components are as follows: 1-Movable base; 11-Movable casters; 21-Feeding end tilting table; 22-Receiving end tilting table; 23-Supporting tray; 24-Tilting shaft; 25-Bearing seat; 3-Energy-saving hydraulic system; 30-Hydraulic power unit; 31-Feeding end cylinder; 32-Receiving end cylinder; 33-Hydraulic motor; 34-Generator; 35-Recovery switching valve; 36-Accumulator; 37-Check valve group; 38-Proportional throttle valve; 39-Pressure sensor; 40-Bidirectional DC / DC converter; 41-Inverter; 42-Rectifier; 43-Energy storage unit; 5-Electrical control panel. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, the mobile hydraulic tilting machine with energy recovery described in this invention mainly includes a mobile base 1, a feeding tilting table 21, a receiving tilting table 22, an energy-saving hydraulic system 3, and an electrical control panel 5.

[0041] The movable base 1 adopts a frame-type steel structure welded from square steel, and its overall rigidity meets the requirements for heavy-duty support and long-term stable operation. Ear plates with pin holes are provided on both sides of the bottom, and connecting plates with pin holes are provided on the upper ends of the movable casters 11. The ear plates and connecting plates are detachably connected by spring pins with self-locking function. During equipment transportation, the connecting plates and ear plates are aligned, and the spring pins are inserted to fix the movable casters 11 to the bottom of the movable base 1. The entire machine can then be pushed or transported to the target work position using the movable casters 11. Upon arrival at the work position, the entire machine is slightly lifted using hoisting equipment, and the spring pins are removed to separate the connecting plates from the ear plates. The movable casters 11 can then be quickly removed, and the equipment is then smoothly lowered so that the bottom surface of the frame of the movable base 1 directly contacts the ground for support, ensuring stable and reliable operation without shaking or displacement.

[0042] Both the feeding end tilting table 21 and the receiving end tilting table 22 are mounted on the movable base 1, with their tilting shafts 24 parallel to each other. Each tilting table is rotatably connected to the movable base 1 via a bearing seat 25. The feeding end tilting table 21 and the receiving end tilting table 22 are arranged opposite to each other and cooperate with each other to complete the workpiece tilting in a segmented relay manner. The feeding end tilting table 21 and the receiving end tilting table 22 are each provided with multiple independent plate-shaped workpiece support plates 23. The support plates 23 on both sides are staggered on the horizontal plane (similar to the staggered teeth of a comb). The upper surface of the support plate 23 is flat and is used to support the bottom surface of the workpiece in a surface contact manner, relying on the surface contact and the weight of the workpiece to achieve stable support.

[0043] like Figure 2 As shown, the energy-saving hydraulic system 3 includes a hydraulic power unit 30, a feeding cylinder 31, a receiving cylinder 32, a recovery switching valve 35, an accumulator 36, a one-way valve group 37, a proportional throttle valve 38, a pressure sensor 39, a hydraulic motor 33, a generator 34, a rectifier 42, a bidirectional DC / DC converter 40, an inverter 41, and an energy storage unit 43.

[0044] The hydraulic power unit 30 includes an oil tank, a hydraulic pump, a main motor, a directional valve, a balance valve, and a relief valve. The hydraulic pump, driven by the main motor, draws oil from the oil tank, filters it, and outputs high-pressure oil. The directional valve is located between the hydraulic pump and the feeding cylinder 31 and the receiving cylinder 32, controlling the selective entry of high-pressure oil into the rodless or rod-type chambers of the feeding cylinder 31 or the receiving cylinder 32, thus achieving the rising and falling of the corresponding tilting platform. The feeding cylinder 31 connects the feeding tilting platform 21 to the movable base 1, and the receiving cylinder 32 connects the receiving tilting platform 22 to the movable base 1. Balance valves are installed between the feeding cylinder 31 and the directional valve, and between the receiving cylinder 32 and the directional valve, respectively, to limit the return oil flow when the tilting platform descends, preventing the tilting platform from stalling and sliding down due to the workpiece's own weight. The relief valve is used for overflow protection when the system pressure is too high.

[0045] The recovery switching valve 35 is a two-position three-way solenoid directional valve, connected between the return port of the terminal cylinder 32 and the inlet port of the hydraulic motor 33, and has a recovery position and a normal return position. The accumulator 36 is a bladder-type accumulator or a piston-type accumulator, and its pre-charge nitrogen pressure is set to 60% to 80% of the system's rated working pressure. It is connected in parallel to the recovery oil circuit between the recovery switching valve 35 and the hydraulic motor 33 through a one-way valve group 37. A pressure sensor 39 is installed on the inlet pipe of the accumulator 36 to detect the pressure inside the accumulator 36 in real time and feed it back to the electronic control panel 5. It is also equipped with an unloading valve and a safety valve. When the pressure inside the accumulator 36 reaches the set upper limit value, the unloading valve opens to allow excess pressure oil to overflow back to the oil tank. The safety valve provides overpressure protection when the unloading valve fails.

[0046] A proportional throttle valve 38 is connected in series on the oil inlet side of the hydraulic motor 33. Its electronic control terminal is connected to the electronic control panel 5. The electronic control panel 5 adjusts the opening in real time according to the feedback signal of the pressure sensor 39 and the descent speed requirement of the tilting table, so as to accurately control the flow rate of the pressure oil entering the hydraulic motor 33.

[0047] The hydraulic motor 33 is coaxially connected to the generator 34. The output of the generator 34 is sequentially connected to the rectifier 42, the bidirectional DC / DC converter 40, and the energy storage unit 43. The energy storage unit 43 is electrically connected to the main motor of the hydraulic power unit 30 through the inverter 41.

[0048] The one-way valve assembly 37 includes a filling one-way valve and a drain one-way valve. The filling one-way valve is located between the inlet of the accumulator 36 and the recovery oil circuit, and is used to charge the accumulator 36 with pressurized oil in one direction during the descent condition. The drain one-way valve is located between the outlet of the accumulator 36 and the inlet of the connecting cylinder 32, and is used to release the hydraulic energy stored in the accumulator 36 to the inlet of the connecting cylinder 32 in one direction during the ascent condition.

[0049] The working process of the portable hydraulic tilting machine with energy recovery of the present invention is as follows:

[0050] (a) Flipping process

[0051] The following is combined Figure 3 The flipping relay process of the flipping table is explained in detail.

[0052] Step 1 (Initial State): As shown Figure 3 As shown in Figure a, the workpiece to be flipped is placed stably on the feeding end flipping table 21, which is in the initial position of 0°. The receiving end flipping table 22 is also in the initial position of 0°. The automatic flipping program is started via the electronic control panel 5.

[0053] Step 2 (the end flipping table rises): as follows Figure 3 As shown in Figure b, the energy-saving hydraulic system 3 drives the end tilting platform 22 to rotate upward (forward rotation) around the tilting shaft 24. After rising to a first preset angle greater than 80° and less than 90° (88° in this embodiment), the electronic control panel 5 controls the reversing valve to switch to the neutral position, and the end tilting platform 22 automatically stops and remains suspended.

[0054] Step 3 (The feed end tilting table lifts the part): For example... Figure 3 As shown in Figure c, the feed end turning table 21 carries the workpiece and rotates upward (forward rotation), and stops after rising to a second preset angle greater than 90° and not greater than 100° (92° in this embodiment).

[0055] Step Four (Relay Pass): For example... Figure 3 As shown in Figure d, the workpiece on the feeding end turning table 21 is transferred to the receiving end turning table 22 under the action of gravity (after the workpiece passes the vertical position, its bottom surface is in contact with the support plate 23 on the receiving end turning table 22). The receiving end turning table 22 continues to turn until the bottom surface of the workpiece is facing upward (i.e., 180° position), completing the final turning.

[0056] (II) Energy recovery process during descent

[0057] When the workpiece is carried by the end-turning table 22 and moves downward, the electronic control panel 5 controls the recovery switching valve 35 to switch to the recovery station according to the power status of the energy storage unit 43 (if the energy storage unit 43 is full, it switches to the normal oil return station and the oil returns directly to the oil tank).

[0058] When the recovery switching valve 35 is in the recovery position, the pressure oil discharged from the rodless chamber of the connecting cylinder 32 no longer directly returns to the oil tank through the relief valve, but instead enters the recovery oil circuit through the recovery switching valve 35. After entering the recovery oil circuit, the pressure oil first enters the accumulator 36 through the filling check valve in the check valve group 37. The accumulator 36 is pre-charged with nitrogen. During the initial descent, the pressure oil discharged has a fast flow rate and large pressure fluctuations. The accumulator 36 effectively absorbs the instantaneous impact through the compressibility of the gas, allowing the pressure in the recovery oil circuit to rise steadily and preventing damage to the hydraulic motor 33 due to instantaneous high-pressure impact. When the pressure in the accumulator 36 reaches a stable value, the pressure oil enters the hydraulic motor 33 through the proportional throttle valve 38. Under the control of the electronic control panel 5, the proportional throttle valve 38 maintains an appropriate opening, precisely throttling and speed-regulating the pressure oil, making the oil flow rate entering the hydraulic motor 33 stable and controllable. The hydraulic motor 33 maintains a uniform rotation speed throughout the descent process. The hydraulic motor 33 is coaxially connected to the generator 34, and the rotation of the hydraulic motor 33 directly drives the generator 34 to rotate and generate electricity. The AC power output by the generator 34 is rectified into DC power by the rectifier 42, and then the voltage is matched and regulated by the bidirectional DC / DC converter 40 so that the output voltage matches the charging voltage of the energy storage unit 43, and finally stored in the energy storage unit 43 for recycling.

[0059] Pressure sensor 39 monitors the pressure in the inlet pipe of accumulator 36 in real time and feeds it back to the electronic control panel 5. When the pressure inside accumulator 36 reaches the set upper limit, the unloading valve automatically opens, and excess pressure oil overflows back to the oil tank; the safety valve provides the last stage of overpressure protection in case the unloading valve fails. When the energy storage unit 43 is fully charged, the electronic control panel 5 controls the recovery switching valve 35 to switch to the normal oil return position, and the oil return from the terminal cylinder 32 returns directly to the oil tank, stopping the recovery and charging.

[0060] (III) Ascending Assist Drive Process

[0061] When the end-lifting platform 22 needs to raise and lift the workpiece, the electronic control panel 5 enters the lifting mode. The energy storage unit 43 releases the stored DC power, which is converted into AC power by the inverter 41 and supplied to the main motor or a dedicated auxiliary motor to provide auxiliary driving force for the hydraulic pump. At the same time, the accumulator 36 releases the stored hydraulic energy to the inlet circuit of the end-lifting cylinder 32 through the drain check valve in the check valve group 37, directly supplementing the oil supply flow of the hydraulic pump. The electrical energy assistance of the energy storage unit 43 and the hydraulic energy assistance of the accumulator 36 work together to drive the end-lifting platform 22 to rise in a dual-assistance manner, effectively reducing the load on the hydraulic pump and the energy consumption of the external power supply, and improving the lifting efficiency.

[0062] The electronic control panel 5 of this invention integrates five control modes, which can be flexibly switched according to different working conditions:

[0063] Lifting mode: The energy storage unit 43 releases electrical energy to assist the main motor, and the accumulator 36 releases hydraulic energy to supplement the oil supply flow, which together drive the tilting table to rise, suitable for workpiece lifting conditions.

[0064] Descent and recovery mode: The recovery switching valve 35 switches to the recovery station, and the return oil from the end cylinder 32 enters the hydraulic motor 33 through the recovery oil circuit to drive the generator. The electrical energy is stored in the energy storage unit 43. This mode is suitable for the descent of the workpiece carried by the end tilting table.

[0065] Energy storage auxiliary mode: Only the energy storage unit 36 ​​participates in buffer energy storage and release, and the hydraulic motor 33 does not participate in power generation. It is suitable for working conditions where no energy recovery is required or the energy storage unit is full.

[0066] Normal oil return mode: When the recovery switching valve 35 is switched to the normal oil return position, the oil return from the end cylinder 32 returns directly to the oil tank without passing through the recovery oil circuit. This mode is suitable for working conditions where energy recovery is not required.

[0067] Fault unloading mode: When the system is abnormal, the recovery switching valve 35 is maintained or switched to the normal oil return position, and the directional valve is locked in the neutral position, and the system is quickly unloaded for protection.

[0068] The electronic control panel 5 also integrates limit protection and emergency stop functions. When a system malfunction occurs (such as the pressure sensor 39 detecting abnormal high pressure, the energy storage unit 43 overheating, or hydraulic pipeline leakage), or when the operator presses the emergency stop button, the electronic control panel 5 immediately controls the directional valve to lock in the neutral position, switches the recovery switching valve 35 to the normal return oil position, and the hydraulic system enters a safe lock-up state. At the same time, an alarm signal is issued to ensure the safety of personnel and equipment.

[0069] After the work is completed, each tilting table can be reset to its initial position via the electrical control panel 5. If it is necessary to move the machine to another location for continued use, use a hoisting device to slightly lift the entire machine, align the connecting plate of the movable caster 11 with the ear plate of the movable base 1, and insert the spring pin to complete the caster installation. Then, push the entire machine to the next work station to continue the work.

[0070] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the inventive concept of the present invention, and all such modifications or additions should fall within the protection scope of the present invention.

Claims

1. A mobile hydraulic tilting machine with energy recovery, comprising a mobile base (1), a feeding tilting table (21), a receiving tilting table (22), an energy-saving hydraulic system (3), and an electrical control panel (5); characterized in that: The feeding end flipping table (21) and the receiving end flipping table (22) are both set on the movable base (1), and the two cooperate with each other to complete the workpiece flipping in a segmented relay manner. The energy-saving hydraulic system (3) includes a hydraulic power unit (30), a feed cylinder (31), a receiving cylinder (32), a recovery switching valve (35), an accumulator (36), a one-way valve group (37), a proportional throttle valve (38), a pressure sensor (39), a hydraulic motor (33), a generator (34), a rectifier (42), a bidirectional DC / DC converter (40), an inverter (41), and an energy storage unit (43). The feeding end cylinder (31) is connected between the feeding end tilting table (21) and the movable base (1) and is used to drive the feeding end tilting table (21) to tilt. The end cylinder (32) is connected between the end tilting table (22) and the movable base (1) and is used to drive the end tilting table (22) to tilt. The recovery switching valve (35) is connected between the return port of the terminal cylinder (32) and the inlet port of the hydraulic motor (33), and has a recovery station and a normal return station. The accumulator (36) is connected in parallel to the recovery oil circuit between the recovery switching valve (35) and the hydraulic motor (33) through the one-way valve group (37); The proportional throttle valve (38) is located on the oil inlet side of the hydraulic motor (33); The pressure sensor (39) is installed in the inlet pipe of the accumulator (36); The hydraulic motor (33) is coaxially connected to the generator (34), and the generator (34) is electrically connected in sequence to the rectifier (42), the bidirectional DC / DC converter (40) and the energy storage unit (43). The energy storage unit (43) is electrically connected to the main motor of the hydraulic power unit (30) via the inverter (41). The electronic control panel (5) controls the recycling switching valve (35) to switch to the recycling position during the descent condition. The pressure oil discharged from the terminal cylinder (32) passes through the recycling oil circuit and is buffered by the accumulator (36), and then enters the hydraulic motor (33) through the proportional throttle valve (38) to drive the generator (34) to generate electricity and charge the energy storage unit (43). During the ascent condition, the energy storage unit (43) supplies power to the hydraulic power unit (30) through the inverter (41), and at the same time, the accumulator (36) releases energy to the oil inlet of the terminal cylinder (32) through the one-way valve group (37) to drive the terminal tilting platform (22) to rise in a dual-assisted manner.

2. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The hydraulic power unit (30) includes a reversing valve and a balance valve. The reversing valve is located between the hydraulic pump and the delivery cylinder (31) and the receiving cylinder (32) to control the hydraulic oil to selectively enter the delivery cylinder (31) or the receiving cylinder (32). The balance valve is provided between the delivery cylinder (31) and the reversing valve and between the receiving cylinder (32) and the reversing valve. The balance valve is used to limit the return oil flow when the tilting platform descends to prevent the tilting platform from stalling and sliding down.

3. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The recycling switching valve (35) is a two-position three-way solenoid valve, which is automatically switched by the electronic control panel (5) according to the power of the energy storage unit (43).

4. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The accumulator (36) is a bladder-type or piston-type accumulator, and its pre-charge pressure is 60% to 80% of the rated working pressure of the system; the inlet pipe of the accumulator (36) is equipped with an unloading valve and a safety valve.

5. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The one-way valve group (37) includes a filling one-way valve and a drain one-way valve; the filling one-way valve is located between the inlet of the accumulator (36) and the recovery oil circuit, and the drain one-way valve is located between the outlet of the accumulator (36) and the oil inlet circuit of the terminal cylinder (32).

6. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The electronic control panel (5) integrates lifting mode, descent recovery mode, energy storage auxiliary mode, normal oil return mode and fault unloading mode; in the lifting mode, the energy storage unit (43) and the accumulator (36) work together to assist in driving; in the descent recovery mode, the recovery switching valve (35) switches to the recovery position; in the energy storage auxiliary mode, only the accumulator (36) participates in buffering and energy release; in the normal oil return mode, the recovery switching valve (35) switches to the normal oil return position; in the fault unloading mode, the system is unloaded for protection.

7. The mobile hydraulic tilting machine with energy recovery according to claim 6, characterized in that: The electronic control panel (5) also integrates an emergency stop function. When the emergency stop occurs, the reversing valve is locked in the neutral position, and the recovery switching valve (35) is switched to the normal oil return position.

8. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The rotating axes of the feeding end flipping table (21) and the receiving end flipping table (22) are parallel to each other; multiple support plates (23) are provided on the feeding end flipping table (21) and the receiving end flipping table (22), and the support plates (23) on both sides are staggered and arranged in a "7" shape.

9. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The segmented relay method is as follows: the receiving end flipping table (22) first rises to a first preset angle greater than 80° and less than 90°, the sending end flipping table (21) carries the workpiece to a second preset angle greater than 90° and not greater than 100°; the workpiece on the sending end flipping table (21) is transferred to the receiving end flipping table (22), and the receiving end flipping table (22) then flips to the bottom surface of the workpiece facing upward.

10. The mobile hydraulic tilting machine with energy recovery according to claim 1, characterized in that: The bottom of the movable base (1) is provided with detachable casters (11), and after the casters (11) are removed, the bottom surface of the movable base (1) is in contact with the ground for support.

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