An adjustable hydraulic jacking device for preventing backflow

Abstract

The present invention discloses an anti-backflow adjustable hydraulic jacking device, which relates to the technical field of hydraulic devices and includes a mounting frame, a lifting unit, a fixing unit, a self-stabilizing unit, an anti-falling unit and an adjusting unit, wherein the mounting frame is used to install the lifting unit and the fixing unit, the lifting unit is used to lift and lower the fixing unit, the fixing unit fixes objects, the self-stabilizing unit is used to self-adjust offset, the anti-falling unit is used to prevent objects from falling, and the adjusting unit is used to regulate the speed of the lifting unit. After the objects are placed on the fixing unit for fixation, the lifting unit lifts the objects. During the movement of the mounting frame, the self-stabilizing unit is used to prevent the device from tilting, and the anti-falling unit is used to prevent objects from falling during offset to pose a safety threat to workers. The lifting speed of the lifting unit is regulated by the adjusting unit to ensure stable object control and improve safety and work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic devices, in particular to an anti-backflow adjustable hydraulic jacking device. Background Art

[0002] Traditional hydraulic jacking devices mostly use conventional support structures, such as simple single-column or multi-column supports. This support structure is difficult to provide sufficient stability. During the jacking process, the offset of the center of gravity of the object can easily lead to uneven force on the device, which in turn causes the object to tip over or shift. If the layout of the support points is unreasonable or the supporting force is unevenly distributed, the equipment may tilt to one side, which will not only damage the equipment but also pose a safety threat to surrounding operators. Moreover, the existing support structure lacks flexibility and adaptability when dealing with textile items of different shapes and sizes, and cannot effectively adjust the support according to the specific conditions of the item.

[0003] During the lifting process, objects will experience a certain degree of sway due to their unstable center of gravity. Some existing hydraulic lifting devices are not equipped with comprehensive fall prevention measures. In the event of equipment failure, hydraulic system leakage or external interference, objects are very likely to fall from the lifting device.

[0004] There are varying requirements for the lifting speed of hydraulic jacking devices. However, most existing hydraulic jacking devices offer only a relatively fixed lifting speed, making it difficult to flexibly adjust according to actual needs. When lifting precision textile equipment, excessively fast speeds can damage internal components, affecting the equipment's accuracy and service life. Conversely, in situations where rapid lifting is required, excessively slow speeds can reduce efficiency and increase production costs. Furthermore, if the speed cannot be precisely controlled during descent, the object may collide violently with the ground, causing damage. Summary of the Invention

[0005] The object of the present invention is to provide an anti-backflow adjustable hydraulic jacking device to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The adjustable hydraulic jacking device for preventing backflow includes a mounting frame, a lifting unit, a fixing unit, a self-stabilizing unit, an anti-falling unit and an adjusting unit. The mounting frame is placed on a horizontal basis, the lifting unit is fixedly connected to the mounting frame, the fixing unit is fixedly connected to the lifting unit, the self-stabilizing unit is fixedly connected to the fixing unit, the self-stabilizing unit is fixedly connected to the anti-falling unit, the anti-falling unit is fixedly connected to the fixing unit, and the adjusting unit is slidably connected to the mounting frame.

[0008] The mounting frame is used to install the lifting unit and the fixing unit. The lifting unit is used to lift the fixing unit, the fixing unit fixes the items, the self-stabilizing unit is used to self-adjust the offset, the anti-falling unit is used to prevent the items from falling, and the adjusting unit is used to regulate the speed of the lifting unit. After the items are placed on the fixing unit and fixed, the lifting unit lifts the items. During the movement of the mounting frame, the self-stabilizing unit is used to prevent the device from tilting, and the anti-falling unit is used to prevent the items from falling during offset to pose a safety threat to the staff. The lifting speed of the lifting unit is regulated by the adjusting unit to ensure stable control of lifting and lowering of items, thereby improving safety and work efficiency.

[0009] Furthermore, the mounting frame is provided with movable rollers.

[0010] In order to facilitate the movement of the device, adapt to various site conditions, and increase the flexibility of the device.

[0011] Furthermore, the lifting unit includes a fixed platform, an electric hydraulic push rod, a scissor-type lifting frame and a push plate. The fixed platform is fixedly installed on the mounting frame, the fixed end of the electric hydraulic push rod is fixedly installed on the fixed platform, the telescopic end of the electric hydraulic push rod is fixedly connected to the scissor-type lifting frame, one end of the scissor-type lifting frame is rotatably connected to the mounting frame, and the other end is slidably connected to the push plate, and the push plate is fixedly connected to the fixed unit.

[0012] The staff uses the controller to control the electric hydraulic push rod to start extending, thereby driving the scissor lift to retract and raise the push plate, thereby driving the fixed unit to lift upward and lift the items to the designated location.

[0013] Furthermore, the fixed unit includes a telescopic motor, a pull rod, a telescopic plate and a shrinking ring. The fixed end of the telescopic motor is fixedly installed on the push plate, the telescopic end of the telescopic motor is fixedly connected to one end of the pull rod, and the other end of the pull rod is fixedly connected to the fixed end of the telescopic plate. The telescopic plate is slidably installed on the push plate, and a shrinking ring is fixedly installed on the telescopic end of the telescopic plate. The telescopic end of the telescopic plate is fixedly connected to the self-stabilizing unit.

[0014] When the staff places the items on the retractable plate, the retractable ring will bundle the items. When the items need to be transported to the designated location, the controller controls the telescopic motor to start and drive the pull rod to move the telescopic plate horizontally, making it easier for the staff to pick up and place the items.

[0015] Furthermore, the self-stabilizing unit includes a chain, a counterweight, a flexible cavity, a conduit, a return spring, a pressure plate and a semi-ring frame. One end of the chain is fixedly connected to the anti-fall unit, and the other end is fixedly connected to the counterweight. The counterweight is slidably installed inside the mounting frame. The counterweight is slidably connected to the flexible cavity through a long plate. The flexible cavity is fixedly installed below the mounting frame. The flexible cavity is filled with magnetorheological fluid. The semi-ring frame is fixedly installed at the telescopic end of the telescopic plate.

[0016] Furthermore, the self-stabilizing unit also includes a counterweight ball, a buffer spring, a magnetic block and an induction coil. Both ends of the catheter are conductively connected to the flexible cavity. One end of the reset spring is fixedly connected to the upper long plate in the flexible cavity, and the other end is fixedly connected to the pressure plate. The counterweight ball is slidably installed on the semi-ring frame. One end of the buffer spring is fixedly connected to the semi-ring frame, and the other end is provided with a flexible plate that abuts the counterweight ball. The magnetic block is fixedly installed on the buffer spring near one end of the induction coil. The induction coil is fixedly installed on the semi-ring frame. The counterweight ball is fixedly connected to the anti-fall unit.

[0017] When the device encounters an uneven road section during its movement, if the device deviates to the left, the flexible cavity on the left comes into contact with the ground, and the counterweight ball slides on the semi-ring frame under the action of its own gravity, thereby pushing the buffer spring on the left to drive the magnetic block to move toward the induction coil, thereby changing the magnetic flux and generating current in the induction coil. At this time, the controller detects the magnitude and direction of the current in the induction coil, and transmits the magnetic field to the flexible cavity on the left, so that the magnetorheological fluid inside the flexible cavity changes its state and viscosity to counteract the tilt of the device, thereby achieving the adjustment of the device's own stability and avoiding safety accidents caused by the device rolling over.

[0018] Furthermore, the anti-fall unit includes a fixed rod, a gear, a rack, a connecting rod, a slider, a pull rope and a baffle, the slider is fixedly connected to the chain, the fixed rod is fixedly installed at the end of the telescopic plate, the gear is fixedly connected to the counterweight ball through a straight rod, the gear is rotatably installed on the fixed rod, the rack is meshed with the gear, the slider is connected to the rack through a connecting rod, the slider is slidably installed on the telescopic end of the telescopic plate, the baffle is connected to the slider through a pull rope, the baffle is rotatably connected to the telescopic plate through a torsion spring, and a through groove is provided on the baffle.

[0019] When the device rolls over to the left, the counterweight ball slides to the left, driving the gear to rotate clockwise, causing the rack to move to the right, and the slider is driven to move to the right under the transmission action of the connecting rod. On the one hand, the baffle on the left side of the telescopic plate is pulled by the pull rope to rotate, blocking the items on the telescopic plate to prevent the items from deviating downward or even falling due to the rollover. At the same time, the slider pulls the left chain to drive the counterweight on the left to move upward, increasing the space inside the left flexible cavity. On the other hand, the counterweight on the right moves downward under the action of its own gravity, squeezing the magnetorheological fluid inside the right flexible cavity to flow through the conduit into the left flexible cavity, squeezing the return spring and the pressure plate. The volume of the magnetorheological fluid inside the left flexible cavity is increased, thereby changing its state under the condition that the controller introduces a magnetic field, and resisting the occurrence of the device tipping over. When the device returns to a horizontal state, the counterweight ball resets under the action of its own gravity and the buffer spring. At this time, the magnetic block moves out of the induction coil, changing the magnetic flux again and generating an opposite current direction. At this time, the controller detects the current direction and stops introducing a magnetic field into the flexible cavity. The magnetorheological fluid turns back into liquid again. At this time, under the action of the restoring force of the reset spring itself, the excess magnetorheological fluid inside the left flexible cavity is squeezed back into the right flexible cavity through the catheter, preparing for the next time the device deflects.

[0020] Furthermore, the adjustment unit includes a vertical plate, an arc-shaped groove, a conductive ring, a guide block and a driving coil. The vertical plate is slidably mounted on the mounting frame. The vertical plate is provided with an arc-shaped groove. The driving coil is fixedly mounted in the arc-shaped groove. The conductive ring is connected to the guide block through a thin rope. The conductive ring is slidably connected to the driving coil. The guide block is fixedly connected to the telescopic end of the telescopic plate. The guide block is slidably connected to the driving coil. The conductive ring is electrically connected to the electric hydraulic push rod.

[0021] When the electric hydraulic push rod drives the telescopic plate to rise, the telescopic plate drives the guide block to slide upward along the driving coil in the arc groove on the vertical plate, driving the conductive ring to contact the driving coil, thereby changing the extension speed of the electric hydraulic push rod and the rising speed of the telescopic plate.

[0022] Furthermore, the driving coil is composed of three parts: an upper part, a middle part, and a lower part. The wire diameters of the upper and lower parts of the driving coil are smaller than the wire diameter of the middle part.

[0023] When the conductive ring gradually moves from the lower part to the upper part of the driving coil, since the wire diameter in the middle of the driving coil is larger than the wire diameters at the upper and lower ends, when the conductive ring rises to the middle driving coil, the wire diameter becomes thicker, the resistance becomes smaller, and the current increases, thereby controlling the electric telescopic push rod to extend faster. When it rises to the upper driving coil, the wire diameter becomes thinner, the resistance becomes larger, and the current decreases, thereby controlling the electric telescopic push rod to extend slower, so that the telescopic plate can start slowly in the initial stage of the ascent, quickly and stably rise in the middle stage, and slowly fine-tune when approaching the target height stage, thereby improving the working efficiency of the device and the stability of the lifting process.

[0024] Furthermore, the electric hydraulic push rod is equipped with an electric valve.

[0025] Once backflow occurs, the controller controls the electric valve to close and lock the electric telescopic push rod in the current position to avoid casualties and property losses caused by sudden drop of the equipment and avoid accidental drop of the push rod due to backflow of hydraulic oil.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention is that when the device encounters an uneven road section during its movement, if the device deviates to the left, the flexible cavity on the left comes into contact with the ground, and the counterweight ball slides on the semi-ring frame under the action of its own gravity, thereby pushing the buffer spring on the left to drive the magnetic block to move toward the induction coil, thereby changing the magnetic flux and generating current in the induction coil. At this time, the controller detects the magnitude and direction of the current in the induction coil, and transmits the magnetic field to the flexible cavity on the left, so that the magnetorheological fluid inside the flexible cavity changes its state and viscosity to counteract the tilt of the device, thereby achieving the adjustment of the device's own stability and avoiding safety accidents caused by the device rolling over.

[0028] 2. The present invention enables the counterweight ball to slide to the left and drive the gear to rotate clockwise when the device rolls over to the left, causing the rack to move to the right and driving the slider to move to the right. On the one hand, the baffle on the left side of the telescopic plate is pulled by the pull rope to rotate, thereby blocking the items on the telescopic plate and preventing the items from shifting downward or even falling due to the rollover. On the other hand, the counterweight block on the right side moves downward under the action of its own gravity, squeezing the magnetorheological fluid inside the right flexible cavity to flow through the conduit into the left flexible cavity, increasing the volume of the magnetorheological fluid inside the left flexible cavity, thereby changing the state when the controller introduces a magnetic field and resisting the rollover of the device.

[0029] 3. The present invention controls the extension speed of the electric telescopic push rod to accelerate when the conductive ring rises to the middle drive coil, the wire diameter becomes thicker, the resistance becomes smaller, and the current increases. When it rises to the upper drive coil, the wire diameter becomes thinner, the resistance becomes larger, and the current decreases, thereby controlling the extension speed of the electric telescopic push rod to slow down, so that the telescopic plate can achieve slow start-up in the initial stage of the ascent, rapid and stable lifting in the middle stage, and slow fine-tuning when approaching the target height stage, thereby improving the working efficiency of the device and the stability of the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall appearance and structure of an anti-backflow adjustable hydraulic jacking device of the present invention;

[0031] Figure 2 This is a schematic diagram of the appearance and structure of a lifting unit of an adjustable hydraulic jacking device for preventing backflow according to the present invention;

[0032] Figure 3 The invention provides an anti-backflow adjustable hydraulic jacking device Figure 1 Another perspective structural diagram;

[0033] Figure 4 The invention provides an anti-backflow adjustable hydraulic jacking device Figure 3 A schematic diagram of the structure of the partial enlarged view at center A;

[0034] Figure 5 The invention provides an anti-backflow adjustable hydraulic jacking device Figure 3 The structural diagram of the partial enlarged view at B in the middle;

[0035] Figure 6 This is a schematic diagram of the installation position structure of the chain, counterweight and flexible chamber of an anti-backflow adjustable hydraulic jacking device of the present invention;

[0036] Figure 7 The invention provides an anti-backflow adjustable hydraulic jacking device Figure 3 Another perspective structural diagram;

[0037] Figure 8 The invention provides an anti-backflow adjustable hydraulic jacking device Figure 7 The schematic diagram of the structure of the partial enlarged view at C in the middle;

[0038] Figure 9 The invention provides an anti-backflow adjustable hydraulic jacking device Figure 7 Schematic diagram of the structure of the local enlarged view at point D in the middle.

[0039] In the figure: 1. Mounting frame; 11. Moving roller; 2. Lifting unit; 21. Fixed platform; 22. Electric hydraulic push rod; 23. Scissor lift; 24. Push plate; 3. Fixed unit; 31. Telescopic motor; 32. Pull rod; 33. Telescopic plate; 34. Shrink ring; 4. Self-stabilizing unit; 41. Chain; 42. Counterweight; 43. Flexible cavity; 44. Conduit; 45. Return spring; 46. Press plate; 47. Half-ring frame; 48. Counterweight ball; 49. Buffer spring; 410. Magnetic block; 411. Induction coil; 5. Anti-fall unit; 51. Fixed rod; 52. Gear; 53. Rack; 54. Connecting rod; 55. Slider; 56. Pull rope; 57. Baffle; 6. Adjustment unit; 61. Vertical plate; 62. Arc groove; 63. Conductive ring; 64. Guide block; 65. Drive coil. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] Example: Figures 1-9 As shown, the present invention provides a technical solution:

[0042] like Figure 1 、 2 As shown, an anti-backflow adjustable hydraulic jacking device includes a mounting frame 1, a lifting unit 2, a fixing unit 3, a self-stabilizing unit 4, an anti-falling unit 5 and an adjusting unit 6. The mounting frame 1 is placed on a horizontal foundation, the lifting unit 2 is fixedly connected to the mounting frame 1, the fixing unit 3 is fixedly connected to the lifting unit 2, the self-stabilizing unit 4 is fixedly connected to the fixing unit 3, the self-stabilizing unit 4 is fixedly connected to the anti-falling unit 5, the anti-falling unit 5 is fixedly connected to the fixing unit 3, and the adjusting unit 6 is slidably connected to the mounting frame 1.

[0043] The mounting frame 1 is used to install the lifting unit 2 and the fixing unit 3. The lifting unit 2 is used to lift the fixing unit 3. The fixing unit 3 fixes objects. The self-stabilizing unit 4 is used to self-adjust the offset. The anti-falling unit 5 is used to prevent objects from falling. The adjusting unit 6 is used to regulate the speed of the lifting unit 2. After the objects are placed on the fixing unit 3 and fixed, the lifting unit 2 lifts the objects. During the movement of the mounting frame 1, the self-stabilizing unit 4 is used to prevent the device from tilting. The anti-falling unit 5 is used to prevent objects from falling during offset to pose a safety threat to the staff. The lifting speed of the lifting unit 2 is regulated by the adjusting unit 6 to ensure stable object control and improve safety and work efficiency.

[0044] like Figure 2 As shown, a moving roller 11 is provided on the mounting frame 1 .

[0045] In order to facilitate the movement of the device, adapt to various site conditions, and increase the flexibility of the device.

[0046] like Figure 2 As shown, the lifting unit 2 includes a fixed platform 21, an electric hydraulic push rod 22, a scissor-type lifting frame 23 and a push plate 24. The fixed platform 21 is fixedly installed on the mounting frame 1, the fixed end of the electric hydraulic push rod 22 is fixedly installed on the fixed platform 21, the telescopic end of the electric hydraulic push rod 22 is fixedly connected to the scissor-type lifting frame 23, one end of the scissor-type lifting frame 23 is rotatably connected to the mounting frame 1, and the other end is slidably connected to the push plate 24, and the push plate 24 is fixedly connected to the fixed unit 3.

[0047] The staff controls the electric hydraulic push rod 22 through the controller to start extending, thereby driving the scissor lift 23 to retract and raise the push plate 24, thereby driving the fixed unit 3 to lift upward and lift the object to the designated position.

[0048] like Figure 2 、 3 As shown in Figure 8, the fixed unit 3 includes a telescopic motor 31, a pull rod 32, a telescopic plate 33 and a shrinking ring 34. The fixed end of the telescopic motor 31 is fixedly installed on the push plate 24, the telescopic end of the telescopic motor 31 is fixedly connected to one end of the pull rod 32, and the other end of the pull rod 32 is fixedly connected to the fixed end of the telescopic plate 33. The telescopic plate 33 is slidably installed on the push plate 24, and the shrinking ring 34 is fixedly installed on the telescopic end of the telescopic plate 33. The telescopic end of the telescopic plate 33 is fixedly connected to the self-stabilizing unit 4.

[0049] When the staff places the items on the retractable ring 34 on the telescopic plate 33, the items are bundled by the retractable ring 34. When the items need to be transported to the designated location, the controller controls the telescopic motor 31 to start and drive the pull rod 32 to move the telescopic plate 33 horizontally, making it easier for the staff to take and place the items.

[0050] like Figure 4 、 6 As shown in , 7 and 9, the self-stabilizing unit 4 includes a chain 41, a counterweight 42, a flexible cavity 43, a conduit 44, a return spring 45, a pressure plate 46 and a semi-ring frame 47. One end of the chain 41 is fixedly connected to the anti-fall unit 5, and the other end is fixedly connected to the counterweight 42. The counterweight 42 is slidably installed inside the mounting frame 1. The counterweight 42 is slidably connected to the flexible cavity 43 through a long plate. The flexible cavity 43 is fixedly installed below the mounting frame 1. The flexible cavity 43 is filled with magnetorheological fluid. The semi-ring frame 47 is fixedly installed at the telescopic end of the telescopic plate 33.

[0051] like Figure 4As shown, the self-stabilizing unit 4 also includes a counterweight ball 48, a buffer spring 49, a magnetic block 410 and an induction coil 411. Both ends of the conduit 44 are conductively connected to the flexible cavity 43. One end of the reset spring 45 is fixedly connected to the upper long plate in the flexible cavity 43, and the other end is fixedly connected to the pressure plate 46. The counterweight ball 48 is slidably installed on the semi-ring frame 47. One end of the buffer spring 49 is fixedly connected to the semi-ring frame 47, and the other end is provided with a flexible plate that abuts the counterweight ball 48. The magnetic block 410 is fixedly installed on the buffer spring 49 near one end of the induction coil 411. The induction coil 411 is fixedly installed on the semi-ring frame 47. The counterweight ball 48 is fixedly connected to the anti-fall unit 5.

[0052] When the device encounters an uneven road section during its movement, if the device deviates to the left, the flexible cavity 43 on the left comes into contact with the ground, and the counterweight ball 48 slides on the semi-ring frame 47 under the action of its own gravity, thereby pushing the buffer spring 49 on the left to drive the magnetic block 410 to move toward the induction coil 411, thereby changing the magnetic flux and generating current in the induction coil 411. At this time, the controller detects the magnitude and direction of the current in the induction coil 411, and transmits a magnetic field to the flexible cavity 43 on the left, so that the magnetorheological fluid inside the flexible cavity 43 changes its state and viscosity to counteract the tilt of the device, thereby achieving the adjustment of the device's own stability and avoiding safety accidents caused by the device rolling over.

[0053] like Figure 4 As shown, the anti-fall unit 5 includes a fixed rod 51, a gear 52, a rack 53, a connecting rod 54, a slider 55, a pull rope 56 and a baffle 57. The slider 55 is fixedly connected to the chain 41, the fixed rod 51 is fixedly installed at the end of the telescopic plate 33, the gear 52 is fixedly connected to the counterweight ball 48 through a straight rod, the gear 52 is rotatably installed on the fixed rod 51, the rack 53 is meshed with the gear 52, the slider 55 is connected to the rack 53 through the connecting rod 54, the slider 55 is slidably installed on the telescopic end of the telescopic plate 33, the baffle 57 is connected to the slider 55 through the pull rope 56, the baffle 57 is rotatably connected to the telescopic plate 33 through a torsion spring, and a through groove is provided on the baffle 57.

[0054] When the device rolls over to the left, the counterweight ball 48 slides to the left, driving the gear 52 to rotate clockwise, causing the rack 53 to move to the right, and under the transmission action of the connecting rod 54, the slider 55 moves to the right. On the one hand, the baffle 57 on the left side of the telescopic plate 33 is pulled by the pull rope 56 to rotate, thereby blocking the objects on the telescopic plate 33 to prevent the objects from deviating downward or even falling due to the rollover. At the same time, the slider 55 pulls the left chain 41 to drive the left counterweight block 42 to move upward, increasing the space inside the left flexible cavity 43. On the other hand, the right counterweight block 42 moves downward under the action of its own gravity, squeezing the magnetorheological fluid inside the right flexible cavity 43 to flow into the left flexible cavity 43 through the conduit 44, squeezing the return spring 45 and the pressure plate 46 increase the volume of the magnetorheological fluid inside the left flexible cavity 43, thereby changing the state under the condition that the controller introduces a magnetic field, and resisting the device from tipping over. When the device returns to a horizontal state, the counterweight ball 48 resets under the action of its own gravity and the buffer spring 49. At this time, the magnetic block 410 moves out of the induction coil 411, changing the magnetic flux again and generating an opposite current direction. At this time, the controller detects the current direction and stops introducing a magnetic field into the flexible cavity 43. The magnetorheological fluid turns back into liquid again. At this time, under the action of the restoring force of the reset spring 45 itself, the excess magnetorheological fluid inside the left flexible cavity 43 is squeezed back into the right flexible cavity 43 through the conduit 44, preparing for the next time the device is offset.

[0055] like Figure 5 As shown, the adjustment unit 6 includes a vertical plate 61, an arc groove 62, a conductive ring 63, a guide block 64 and a driving coil 65. The vertical plate 61 is slidably mounted on the mounting frame 1. The vertical plate 61 is provided with an arc groove 62. The driving coil 65 is fixedly mounted in the arc groove 62. The conductive ring 63 is connected to the guide block 64 by a thin rope. The conductive ring 63 is slidably connected to the driving coil 65. The guide block 64 is fixedly connected to the telescopic end of the telescopic plate 33. The guide block 64 is slidably connected to the driving coil 65. The conductive ring 63 is electrically connected to the electric hydraulic push rod 22.

[0056] When the electric hydraulic push rod 22 drives the telescopic plate 33 to rise, the telescopic plate 33 drives the guide block 64 to slide upward along the drive coil 65 in the arc groove 62 on the vertical plate 61, driving the conductive ring 63 to contact the drive coil 65, thereby changing the extension speed of the electric hydraulic push rod 22 and the rising speed of the telescopic plate 33.

[0057] like Figure 5 As shown, the driving coil 65 is composed of three parts: upper, middle and lower parts. The wire diameters of the upper and lower parts of the driving coil 65 are smaller than the wire diameter of the middle part.

[0058] When the conductive ring 63 gradually moves from the lower part to the upper part of the driving coil 65, since the wire diameter in the middle of the driving coil 65 is larger than the wire diameters at the upper and lower ends, when the conductive ring 63 rises to the middle driving coil 65, the wire diameter becomes thicker, the resistance becomes smaller, and the current increases, thereby controlling the electric telescopic push rod to extend faster. When it rises to the upper driving coil 65, the wire diameter becomes thinner, the resistance becomes larger, and the current decreases, thereby controlling the electric telescopic push rod to extend slower, so that the telescopic plate 33 can achieve slow start-up in the initial stage of the ascent, rapid and stable lifting in the middle stage, and slow fine-tuning when approaching the target height stage, thereby improving the working efficiency of the device and the stability of the lifting process.

[0059] like Figure 2 As shown, the electric hydraulic push rod 22 is equipped with an electric valve.

[0060] Once backflow occurs, the controller controls the electric valve to close and lock the electric telescopic push rod in the current position to avoid casualties and property losses caused by sudden drop of the equipment and avoid accidental drop of the push rod due to backflow of hydraulic oil.

[0061] Working principle of the present invention:

[0062] After the staff places the items on the retractable ring 34 on the telescopic plate 33, the items are bundled by the retractable ring 34. When the items need to be transported to the designated location, the telescopic motor 31 is controlled by the controller to start and drive the pull rod 32 to move the telescopic plate 33 in the horizontal direction, which is convenient for the staff to take and place. The staff controls the electric hydraulic push rod 22 to start and extend through the controller, thereby driving the scissor lift 23 to retract and raise the push plate 24, thereby driving the fixed unit 3 to lift upward and lift the items to the designated location.

[0063] At this time, the counterweight ball 48 slides on the half-ring frame 47 under the action of its own gravity, thereby pushing the buffer spring 49 on the left to drive the magnetic block 41 to move upward. 0 moves toward the induction coil 411, thereby changing the magnetic flux and generating a current in the induction coil 411. At this time, the controller detects the magnitude and direction of the current in the induction coil 411 and transmits a magnetic field into the left flexible chamber 43, thereby causing the magnetorheological fluid inside the flexible chamber 43 to change its state and viscosity to counteract the tilt of the device, thereby adjusting the device's own stability and preventing the device from tipping over and causing a safety accident. When the device returns to a horizontal state, the counterweight ball 48 resets under the action of its own gravity and the buffer spring 49. At this time, the magnetic block 410 moves out of the induction coil 411, changing the magnetic flux again and generating a current in the opposite direction. At this time, the controller detects the current direction and stops supplying the magnetic field to the flexible chamber 43. The magnetorheological fluid returns to a liquid state again. At this time, under the action of the self-restoring force of the reset spring 45, the excess magnetorheological fluid inside the left flexible chamber 43 is squeezed back into the right flexible chamber 43 through the conduit 44, preparing for the next device deviation.

[0064] When the electric hydraulic push rod 22 drives the telescopic plate 33 to rise, the telescopic plate 33 drives the guide block 64 to slide upward along the drive coil 65 in the arc groove 62 on the vertical plate 61, driving the conductive ring 63 to contact the drive coil 65. When the conductive ring 63 gradually moves from the lower part to the upper part of the drive coil 65, since the wire diameter in the middle of the drive coil 65 is larger than the wire diameter at the upper and lower ends, when the conductive ring 63 rises to the middle drive coil 65, the wire diameter becomes thicker and the resistance becomes smaller, and the current increases, thereby controlling the electric telescopic push rod to extend faster. When it rises to the upper drive coil 65, the wire diameter becomes thinner and the resistance becomes larger, and the current decreases, thereby controlling the electric telescopic push rod to extend slower, so that the telescopic plate 33 can achieve slow start-up in the initial stage of the ascent, rapid and stable jacking in the middle stage, and slow fine-tuning when approaching the target height stage, thereby improving the working efficiency of the device and the stability of the jacking process.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An adjustable hydraulic jacking device with backflow prevention, characterized by: The anti-backflow adjustable hydraulic jacking device comprises a mounting frame (1), a lifting unit (2), a fixing unit (3), a self-stabilizing unit (4), an anti-falling unit (5) and an adjusting unit (6), wherein the mounting frame (1) is placed on a horizontal foundation, the lifting unit (2) is fixedly connected to the mounting frame (1), the fixing unit (3) is fixedly connected to the lifting unit (2), the self-stabilizing unit (4) is fixedly connected to the fixing unit (3), the self-stabilizing unit (4) is fixedly connected to the anti-falling unit (5), the anti-falling unit (5) is fixedly connected to the fixing unit (3), and the adjusting unit (6) is slidably connected to the mounting frame (1); The fixed unit (3) includes a telescopic motor (31), a pull rod (32), a telescopic plate (33) and a shrink ring (34); the self-stabilizing unit (4) includes a chain (41), a counterweight (42), a flexible cavity (43), a guide tube (44), a return spring (45), a pressure plate (46) and a semi-ring frame (47); one end of the chain (41) is fixedly connected to the anti-fall unit (5), and the other end is fixedly connected to the counterweight (42); the counterweight (42) is slidably mounted inside the mounting frame (1); the counterweight (42) is slidably connected to the flexible cavity (43) through a long plate; the flexible cavity (43) is fixedly mounted below the mounting frame (1); the flexible cavity (43) is filled with magnetorheological fluid; the semi-ring frame (47) is fixedly mounted at the telescopic end of the telescopic plate (33); The self-stabilizing unit (4) further comprises a counterweight ball (48), a buffer spring (49), a magnetic block (410) and an induction coil (411). Both ends of the conduit (44) are conductively connected to the flexible cavity (43). One end of the return spring (45) is fixedly connected to the upper long plate in the flexible cavity (43), and the other end is fixedly connected to the pressure plate (46). The counterweight ball (48) is slidably mounted on the semi-ring frame (47). One end of the buffer spring (49) is fixedly connected to the semi-ring frame (47), and the other end is provided with a flexible plate abutting the counterweight ball (48). The magnetic block (410) is fixedly mounted on the buffer spring (49) near one end of the induction coil (411). The induction coil (411) is fixedly mounted on the semi-ring frame (47). The counterweight ball (48) is fixedly connected to the anti-fall unit (5).

2. The adjustable hydraulic jacking device for preventing backflow according to claim 1, characterized in that: A movable roller (11) is provided on the mounting frame (1).

3. The anti-backflow adjustable hydraulic jacking device according to claim 1, characterized in that: The lifting unit (2) comprises a fixed platform (21), an electric hydraulic push rod (22), a scissor-type lifting frame (23) and a push plate (24), wherein the fixed platform (21) is fixedly mounted on the mounting frame (1), the fixed end of the electric hydraulic push rod (22) is fixedly mounted on the fixed platform (21), the telescopic end of the electric hydraulic push rod (22) is fixedly connected to the scissor-type lifting frame (23), one end of the scissor-type lifting frame (23) is rotatably connected to the mounting frame (1), and the other end is slidably connected to the push plate (24), and the push plate (24) is fixedly connected to the fixed unit (3).

4. The anti-backflow adjustable hydraulic jacking device according to claim 3, characterized in that: The fixed end of the telescopic motor (31) is fixedly mounted on the push plate (24), the telescopic end of the telescopic motor (31) is fixedly connected to one end of the pull rod (32), the other end of the pull rod (32) is fixedly connected to the fixed end of the telescopic plate (33), the telescopic plate (33) is slidably mounted on the push plate (24), a shrinking ring (34) is fixedly mounted on the telescopic end of the telescopic plate (33), and the telescopic end of the telescopic plate (33) is fixedly connected to the self-stabilizing unit (4).

5. The anti-backflow adjustable hydraulic jacking device according to claim 1, characterized in that: The anti-fall unit (5) includes a fixed rod (51), a gear (52), a rack (53), a connecting rod (54), a slider (55), a pull rope (56) and a baffle (57), wherein the slider (55) is fixedly connected to the chain (41), the fixed rod (51) is fixedly mounted on the end of the telescopic plate (33), the gear (52) is fixedly connected to the counterweight ball (48) through a straight rod, the gear (52) is rotatably mounted on the fixed rod (51), the rack (53) is meshed with the gear (52), the slider (55) is connected to the rack (53) through the connecting rod (54), the slider (55) is slidably mounted on the telescopic end of the telescopic plate (33), the baffle (57) is connected to the slider (55) through the pull rope (56), the baffle (57) is rotatably connected to the telescopic plate (33) through a torsion spring, and a through slot is provided on the baffle (57).

6. The anti-backflow adjustable hydraulic jacking device according to claim 1, characterized in that: The adjustment unit (6) includes a vertical plate (61), an arc-shaped groove (62), a conductive ring (63), a guide block (64) and a driving coil (65), wherein the vertical plate (61) is slidably mounted on the mounting frame (1), the vertical plate (61) is provided with an arc-shaped groove (62), the driving coil (65) is fixedly mounted in the arc-shaped groove (62), the conductive ring (63) is connected to the guide block (64) through a thin rope, the conductive ring (63) is slidably connected to the driving coil (65), the guide block (64) is fixedly connected to the telescopic end of the telescopic plate (33), the guide block (64) is slidably connected to the driving coil (65), and the conductive ring (63) is electrically connected to the electric hydraulic push rod (22).

7. The anti-backflow adjustable hydraulic jacking device according to claim 6, characterized in that: The driving coil (65) consists of three parts: an upper part, a middle part, and a lower part. The wire diameters of the upper and lower parts of the driving coil (65) are smaller than the wire diameter of the middle part.

8. The anti-backflow adjustable hydraulic jacking device according to claim 3, characterized in that: The electric hydraulic push rod (22) is equipped with an electric valve.

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