Backflow-preventing adjustable hydraulic jacking device

Abstract

The invention discloses an anti-backflow adjustable hydraulic jacking device, and relates to the technical field of hydraulic devices, the anti-backflow adjustable hydraulic jacking device comprises 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 used for mounting the lifting unit and the fixing unit, the lifting unit is used for lifting the fixing unit, the fixing unit is used for fixing an object, and the self-stabilizing unit is used for stabilizing the object. The self-stabilizing unit is used for self-adjusting deviation, the anti-falling unit is used for preventing articles from falling, the adjusting unit is used for adjusting and controlling the speed of the lifting unit, the articles are lifted by the lifting unit after being placed on the fixing unit to be fixed, and the device is prevented from inclining through the self-stabilizing unit in the advancing process of the mounting frame. Safety threats to workers caused by falling of objects during deviation are avoided through the anti-falling unit, the lifting speed of the lifting unit is adjusted and controlled through the adjusting unit, it is guaranteed that lifting of the objects is controlled stably, and safety and working efficiency are improved.

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] Most traditional hydraulic lifting devices use conventional support structures, such as simple single-column or multi-column support forms. This support structure is difficult to provide sufficient stability. During the lifting process, due to the offset of the center of gravity of the object, it is easy to cause 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 support 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 the 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 shake to a certain extent due to the unstable center of gravity. Some existing hydraulic lifting devices are not equipped with perfect anti-falling measures. Once there is equipment failure, hydraulic system leakage or external interference, objects are very likely to fall from the lifting device.

[0004] There are different requirements for the lifting speed of hydraulic lifting devices. However, most of the existing hydraulic lifting devices can only provide a relatively fixed lifting speed, which is difficult to flexibly adjust according to actual needs. When lifting some precision textile equipment, too fast a speed may cause damage to the internal parts of the equipment, affecting the accuracy and service life of the equipment; and in some occasions where the lifting operation needs to be completed quickly, too slow a speed will reduce work efficiency and increase production costs. In addition, during the descent process, if the speed cannot be accurately controlled, the object may collide violently with the ground and cause damage. Summary of the invention

[0005] The object of the present invention is to provide an adjustable hydraulic jacking device for preventing backflow, so as 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 object, the self-stabilizing unit is used to self-adjust the offset, the anti-falling unit is used to prevent the object from falling, and the adjusting unit is used to adjust the speed of the lifting unit. After the object is placed on the fixing unit for fixation, the lifting unit lifts the object. 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 object from falling during offset to pose a safety threat to the staff. The lifting speed of the lifting unit is adjusted by the adjusting unit to ensure stable object control lifting and lowering, 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, a shrinking ring is fixedly installed on the telescopic end of the telescopic plate, and 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 items are bundled through the retractable ring. When the items need to be transported to the specified location, the controller controls the telescopic motor to start and drive the pull rod to move the telescopic plate horizontally, which is convenient for the staff to take and place.

[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 conduit 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 into 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 tipping 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 on 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 meshingly connected to 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 opened on the baffle.

[0019] When the device rolls over to the left, the counterweight ball slides to the left and drives the gear to rotate clockwise, causing the rack to move to the right. 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, thereby blocking the objects on the telescopic plate to prevent the objects from shifting downward or even falling due to the rollover. At the same time, the slider pulls the left chain to drive the counterweight block on the left to move upward, increasing the space inside the left flexible cavity. On the other hand, the counterweight block 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 reset spring and the pressure plate. The volume of the magnetorheological fluid inside the left flexible cavity is increased, thereby changing the state under the condition that the controller introduces a magnetic field to resist the device from tipping over. When the device returns to a horizontal state, the counterweight ball is reset under the action of its own gravity and the buffer spring. At this time, the magnetic block is removed from the induction coil, and the magnetic flux is changed again to generate 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, the excess magnetorheological fluid in the left flexible cavity is squeezed back into the right flexible cavity through the catheter under the action of the reset spring's own restoring force, preparing for the next time the device is offset.

[0020] Furthermore, the adjustment unit includes a vertical plate, an arc 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 groove. The driving coil is fixedly mounted in the arc 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 part 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 locks the electric telescopic push rod in the current position to avoid casualties and property losses caused by sudden descent of the equipment and to avoid accidental descent 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. 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 weighted 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 into 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 resist the inclination of the device, thereby achieving the adjustment of the device's own stability and avoiding safety accidents caused by the device tipping over.

[0028] 2. 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 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 objects on the telescopic plate and preventing the objects 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 into the left flexible cavity through the conduit, increasing the volume of the magnetorheological fluid inside the left flexible cavity, thereby changing the state when the controller passes the 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 increase by making the wire diameter thicker, the resistance smaller, and the current increase when the conductive ring rises to the middle driving coil; and controls the extension speed of the electric telescopic push rod to decrease by making the wire diameter thinner, the resistance larger, and the current decrease when the conductive ring rises to the upper driving coil. The telescopic push rod can be started slowly in the initial stage of the ascent, can be lifted up quickly and stably in the middle stage, and can be fine-tuned slowly 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 It is a schematic diagram of the overall appearance structure of an anti-backflow adjustable hydraulic jacking device of the present invention;

[0031] Figure 2 This is a schematic diagram of the appearance 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 adjustable hydraulic jacking device for preventing backflow Figure 1 Another perspective structural diagram;

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

[0034] Figure 5 The invention provides an adjustable hydraulic jacking device for preventing backflow Figure 3 The structural schematic diagram of the local 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 adjustable hydraulic jacking device for preventing backflow Figure 3 Another perspective structural diagram;

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

[0038] Fig. 9 The invention provides an adjustable hydraulic jacking device for preventing backflow Figure 7 Schematic diagram of the structure of the partial 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, catheter; 45, reset spring; 46, pressure plate; 47, semi-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, driving coil. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0041] Example: Figure 1-Figure 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 adjust 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 the objects from falling when offset to pose a safety threat to the staff. The lifting speed of the lifting unit 2 is adjusted by the adjusting unit 6 to ensure stable object control lifting and lowering, thereby improving 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 , 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, 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, the shrinking ring 34 is fixedly installed 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.

[0049] When the staff places the items on the shrink ring 34 on the telescopic plate 33, the items are bundled by the shrink ring 34. When the items need to be transported to the specified location, the controller controls the telescopic motor 31 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.

[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 reset 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 resist the tilt of the device, thereby achieving the adjustment of the device's own stability and avoiding safety accidents caused by the device tipping 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 and drives the gear 52 to rotate clockwise, causing the rack 53 to move to the right. 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 shifting 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 chamber 43, thereby changing the state under the condition that the controller passes the magnetic field to resist 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, and changes the magnetic flux again to generate an opposite current direction. At this time, the controller detects the current direction and stops passing the magnetic field into the flexible chamber 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 chamber 43 is squeezed back into the right flexible chamber 43 through the conduit 44 to prepare for the next offset of the device.

[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, and an arc groove 62 is provided on the vertical plate 61. The driving coil 65 is fixedly mounted in the arc 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.

[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 driving coil 65 in the arc groove 62 on the vertical plate 61, driving the conductive ring 63 to contact the driving 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. 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 part 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 locks the electric telescopic push rod in the current position to avoid casualties and property losses caused by sudden descent of the equipment and to avoid accidental descent of the push rod due to backflow of hydraulic oil.

[0061] Working principle of the present invention:

[0062] 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 telescopic motor 31 is controlled by the controller to start driving 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 extending through the controller, thereby driving the scissor lift 23 to retract and lift the push plate 24, thereby driving the fixed unit 3 to lift upward and lift the items to the designated location.

[0063] When the device rolls over to the left, the counterweight ball 48 slides to the left and drives the gear 52 to rotate clockwise, causing the rack 53 to move to the right. 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 shifting downward or even falling due to the rollover. At the same time, the slider 55 pulls the left chain 41 to drive the counterweight block 42 on the left to move upward, increasing the space inside the left flexible cavity 43. On the other hand, the counterweight block 42 on the right 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 reset spring 45 and the pressure plate 46, and increasing the volume of the magnetorheological fluid inside the left flexible cavity 43. At this time, 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 41 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 to the left flexible cavity 43, so that the magnetorheological fluid inside the flexible cavity 43 changes its state and viscosity to resist the tilt of the device, thereby adjusting the stability of the device itself to avoid a safety accident caused by the device tipping over. When the device is restored to a horizontal state, the weight ball 48 is reset under the action of its own gravity and the buffer spring 49. At this time, the magnetic block 410 is removed from 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 passing the magnetic field into the flexible cavity 43. The magnetorheological fluid returns to a liquid state 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, in preparation for the next device offset.

[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 driving coil 65 in the arc groove 62 on the vertical plate 61, driving the conductive ring 63 to contact the driving coil 65. 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 part of the driving coil 65 is larger than the wire diameter 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 extension speed of the electric telescopic push rod to increase. 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 extension speed of the electric telescopic push rod to decrease, so that the telescopic plate 33 can achieve slow start-up in the initial stage, rapid and stable lifting in the middle stage, and slow fine-tuning when approaching the target height stage during the rising process, thereby improving the working efficiency of the device and the stability of the lifting process.

[0065] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An adjustable hydraulic jacking device for preventing backflow, characterized in that: 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); the mounting frame (1) is placed on a horizontal basis; 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).

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

3. The adjustable hydraulic jacking device for preventing backflow according to claim 1 is 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); 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); the push plate (24) is fixedly connected to the fixed unit (3).

4. The adjustable hydraulic jacking device for preventing backflow according to claim 3 is characterized in that: The fixed unit (3) comprises 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 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 adjustable hydraulic jacking device for preventing backflow according to claim 4 is characterized in that: The self-stabilizing unit (4) comprises 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-falling 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) via a long plate; the flexible cavity (43) is fixedly mounted below the mounting frame (1); the flexible cavity (43) is filled with magnetorheological fluid; and the semi-ring frame (47) is fixedly mounted on the telescopic end of the telescopic plate (33).

6. The adjustable hydraulic jacking device for preventing backflow according to claim 5, characterized in that: The self-stabilizing unit (4) further comprises a weighted 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 weighted 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 against the weighted 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); and the weighted ball (48) is fixedly connected to the anti-falling unit (5).

7. The adjustable hydraulic jacking device for preventing backflow according to claim 6, characterized in that: The anti-falling unit (5) comprises 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 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 meshedly connected to the gear (52); the slider (55) is connected to the rack (53) through a 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 a 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).

8. The adjustable hydraulic jacking device for preventing backflow according to claim 1, characterized in that: The adjustment unit (6) comprises a vertical plate (61), an arc-shaped 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-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) and the driving coil (65) are slidably connected; the guide block (64) is fixedly connected to the telescopic end of the telescopic plate (33); the guide block (64) and the driving coil (65) are slidably connected; and the conductive ring (63) is electrically connected to the electric hydraulic push rod (22).

9. The adjustable hydraulic jacking device for preventing backflow according to claim 8, 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.

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

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