Oil return structure of hydraulic jack

Abstract

The invention relates to the technical field of jacks, in particular to an oil return structure of a hydraulic jack. The device comprises a jack and at least two blocking mechanisms, the two blocking mechanisms are symmetrically arranged with the jack as the center, each blocking mechanism comprises a fixed communication block arranged on the peripheral face of the jack, and the upper end face of each fixed communication block is fixedly connected with a telescopic box. By means of the telescopic box, the expansion assembly and the release assembly in the blocking mechanism, when the oil cylinder explodes, additional support can be provided for the piston so as to avoid the situation that the piston loses oil, and consequently a lifted heavy object falls off, the situation that the lifted heavy object falls off due to the fact that the piston loses oil supporting is effectively avoided, personnel safety is guaranteed, and the working efficiency is improved. Equipment damage and property loss caused by falling of heavy objects are reduced, the stability of the working process is ensured, work interruption and production stagnation caused by sudden cylinder explosion events are avoided, and operation continuity and high efficiency are maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of jacks, and particularly relates to an oil return structure of a hydraulic jack. Background Art

[0002] A hydraulic jack is composed of an oil pump, an oil cylinder, an oil tank, a piston, various valves and oil pipes. The oil pump converts mechanical energy into hydraulic oil pressure energy to push the oil. The oil cylinder drives the piston to rise by the oil pressure to lift heavy objects, and the oil tank stores oil. Its oil return structure includes an oil return valve, a check valve and an oil pipe. The opening of the oil return valve provides an oil return channel for the oil. The check valve prevents reverse flow, and the oil pipe ensures the oil flow to achieve oil return. Hydraulic jacks are divided into manual and electric types. The manual type is driven by manpower to operate the oil pump handle to drive the oil to lift. It has a simple structure and low cost, and is suitable for lifting lighter objects but with low efficiency. The electric type is powered by an electric motor, with a fast lifting speed, labor-saving and high degree of automation. It is suitable for lifting heavier objects and is applicable to scenarios with high requirements for work efficiency and operation.

[0003] When the existing electric hydraulic jack is lifting a heavy object with a large weight and rising or falling, and the oil cylinder explodes, a large amount of oil will leak instantaneously, resulting in the inability to continuously provide a driving force for the piston. At this time, the oil return structure will also lose its function and cannot control the oil flow according to the normal mechanism. This will cause the heavy object to suddenly lose support, causing the workers below to be injured, leading to serious safety accidents. At the same time, the falling of the heavy object may also damage the surrounding equipment and facilities, resulting in property losses at the work site, and will also cause the ongoing work to be interrupted, seriously affecting the work progress and production efficiency. Summary of the Invention

[0004] In view of the above-mentioned drawbacks of the prior art, the present invention provides an oil return structure of a hydraulic jack, which can effectively solve the problems in the prior art that when the oil cylinder explodes, it is impossible to continuously provide a driving force for the piston, causing the heavy object to suddenly lose support and injuring the workers below.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: The present invention provides an oil return structure of a hydraulic jack, including: A jack and a base; A blocking mechanism, having at least two blocking mechanisms, and the two blocking mechanisms are symmetrically arranged with the jack as the center. The blocking mechanism includes a fixed communication block arranged on the outer peripheral surface of the jack. The upper end surface of the fixed communication block is fixedly connected with a telescopic box. One side of the telescopic box away from the fixed communication block is fixedly connected with a connecting block. A plurality of sets of packing boxes are linearly arranged in an array on the inner wall of the telescopic box. A plurality of expansion components and a plurality of sets of telescopic rods are alternately arranged on the opposite surfaces of the connecting block and the fixed communication block. A plurality of release components are annularly arranged on the outer peripheral surface of the expansion component; A flow cutoff mechanism, the flow cutoff mechanism includes a liquid storage tank and a box body fixedly connected to the upper end surface of the base. A collision component is arranged on one side of the box body facing the jack. On one side of the inner part of the box body facing the collision component, two positioning components, two valves and a plurality of contraction rods are arranged in sequence. A rotation prevention component corresponding to the positioning component is arranged on the upper end surface of the box body.

[0006] Preferably, the jack is composed of an oil cylinder and a piston. The fixed communication block is fixedly connected to the bottom of the outer peripheral surface of the oil cylinder. A curved pipe is fixedly communicated with one side of the fixed communication block. A communication pipe is fixedly communicated with the upper end surface of the fixed communication block. A tee block is fixedly connected to the outer peripheral surface of the oil cylinder between the two blocking mechanisms. Two of the ports of the tee block are communicated with the other end of the curved pipe.

[0007] Preferably, the telescopic box is composed of a plurality of installation boxes and a plurality of elastic boxes alternately arranged. And there are four sets of storage boxes in each group. The storage boxes correspond to the installation boxes and are fixedly connected to the inner walls around the installation boxes. Compressed powder is stored in the storage boxes. A connecting rod is fixedly connected to one side of the connecting block facing the piston. The connecting rod is fixedly connected to the top of the outer peripheral surface of the piston.

[0008] Preferably, the plurality of expansion components include two air bags and a communication ring. The communication ring is fixedly communicated between the two air bags. On one side of each air bag away from the communication ring, a fixed disk is fixedly connected. The fixed disk close to the fixed communication block is fixedly connected to the upper end surface of the fixed communication block. And the other end of the communication pipe penetrates through the fixed disk and is communicated with the corresponding air bag. The fixed disk close to the connecting block is fixedly connected to the bottom of the connecting block. Each group of telescopic rods has a plurality of them, and both ends of the telescopic rod are fixedly connected to the opposite surfaces of adjacent two fixed disks. An intercommunication pipe is fixedly connected between the adjacent two fixed disks, and both ends of the intercommunication pipe penetrate through the fixed disk and are communicated with the air bag.

[0009] Preferably, the release component includes a release pipe fixedly communicated with the outer peripheral surface of the fixed disk. A plurality of partition plates are fixedly connected in an annular array on the inner peripheral surface of the release pipe near one end of the fixed disk. A sliding disk is jointly contacted on the side of the partition plates away from the fixed disk, and the sliding disk is hermetically slidably connected with the inner peripheral surface of the release pipe. The other end of the release pipe is fixedly connected with a sealing disk. A discontinuous rod is fixedly connected to the center position of the opposite surface of the sealing disk and the sliding disk. A plurality of release holes are annularly arranged on the outer peripheral surface of the release pipe where the discontinuous rod is located.

[0010] Preferably, the collision assembly includes a communication block fixedly connected to the side of the box body facing the jack. The side of the communication block facing the box body penetrates through the box body and extends into the interior of the box body. A liquid pipe is fixedly connected to the side of the communication block away from the box body. The other end of the liquid pipe is communicated with another port of the three-way block. A communication port communicated with the liquid pipe is opened on one side of the communication block located inside the box body. Damping telescopic rods are fixedly connected to the peripheries of the side of the communication block located inside the box body. The telescopic ends of the damping telescopic rods are fixedly connected together with a connecting plate. A flow concentrating cover is fixedly connected to the side of the connecting plate facing the communication block, and the flow concentrating cover corresponds to the communication port. Two semi-circular covers are symmetrically and fixedly connected to the other side of the connecting plate.

[0011] Preferably, the valve is hermetically hinged to the interior of the box body. The positioning assembly includes a rotating rod rotatably connected to the inner bottom of the box body. At least two I-shaped wheels are linearly and arrayedly fixedly connected to the rod body of the rotating rod. A rope is wound in the notch of the I-shaped wheel. One end of the rope is fixedly connected to the inner wall of the box body on the side of the communication block, and the other end of the rope is fixedly connected to the valve.

[0012] Preferably, the contraction rod is fixedly connected to the end of the valve away from the rope, and the other end of the contraction rod is fixedly connected to the inner wall of the liquid storage tank of the box body. One side of the box body facing the liquid storage tank is communicated with the liquid storage tank through a pipeline. A reaction liquid is stored in the liquid storage tank.

[0013] Preferably, the rotation prevention assembly includes a chassis rotatably connected to the inner top of the box body. The bottom of the chassis is fixedly connected to the other end of the rotating rod. A plurality of broken blocks are fixedly connected to the upper end surface of the chassis in a circular array. The upper end surfaces of the broken blocks are fixedly connected together with a top plate, and the top plate is fixedly connected to the top of the box body.

[0014] Preferably, it further includes an oil suction and transportation mechanism. The oil suction and transportation mechanism includes an oil storage tank fixedly connected to the upper end surface of the base. A controller is installed on the side of the oil storage tank. An electric control oil valve and an oil pump are fixedly connected to the upper end surface of the oil storage tank, and the electric control oil valve is electrically connected to the controller. The electric control oil valve has a main port, an input end, and an output end. The output end of the electric control oil valve is fixedly communicated with an oil delivery pipe, and the other end of the oil delivery pipe is communicated with the oil delivery end of the oil cylinder. The input end of the electric control oil valve is fixedly connected to an oil suction pipe, and the other end of the oil suction pipe is communicated with the oil outlet end of the oil cylinder; The main port of the electric control oil valve is fixedly communicated with the output end of the oil pump through a pipeline, and the input end of the oil pump is fixedly communicated with the oil storage tank through a pipeline.

[0015] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art: 1. By blocking the telescopic box, expansion component and release component in the blocking mechanism, it is possible to provide additional support to the piston when the oil cylinder explodes, so as to prevent the heavy object lifted by the piston from falling due to the loss of hydraulic fluid. Among them, the telescopic box expands and contracts as the piston moves up and down in the oil cylinder. When the telescopic box expands and contracts, it also drives the expansion component inside it to expand to varying degrees. As the expansion component expands, it absorbs the corresponding reaction liquid in the flow cut-off mechanism. When the oil cylinder explodes and the piston transfers pressure to the telescopic box, causing the expansion component to be under great pressure from the heavy object, the release component discharges the reaction liquid absorbed by the expansion component. Then, the discharged reaction liquid chemically reacts with the compressed powder in the storage box inside the telescopic box, generating a large amount of gas to fill the telescopic box, increasing the internal air pressure of the telescopic box, and providing additional support to the piston in a timely manner. This effectively prevents the piston from falling due to the loss of hydraulic fluid support, ensures the safety of personnel, reduces equipment damage and property losses caused by the falling of heavy objects, ensures the stability of the working process, and avoids work interruption and production stagnation caused by sudden cylinder explosion events, maintaining the continuity and efficiency of the operation.

[0016] 2. By means of the valve, contraction rod, rotation blocking component, positioning component and collision component in the flow cut-off mechanism, when the expansion component is under great pressure from the heavy object, the valve can be closed by using the impact of the reaction liquid flowing back into the box when the expansion component is compressed, so as to block the further backflow of the reaction liquid into the liquid storage box. Then, the reaction liquid in the expansion component is discharged from the release component. Among them, the collision component will collide with the valve when being impacted by the backflow of the reaction liquid. The contraction rod and the positioning component are used to maintain the support and locking of the valve in the initial open state, and when the collision component collides with the valve, the positioning component rotates and the contraction rod contracts, thus closing the valve. The rotation blocking component is used to lock the rotation of the positioning component, so that the valve can only rotate when it is impacted by the collision force of the collision component, avoiding the reaction liquid flowing through the valve under normal conditions and causing the valve to close, and preventing the valve from closing erroneously due to accidental factors when the reaction liquid is flowing normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the whole of the present invention; Figure 2 It is a schematic structural diagram of the blocking mechanism of the present invention; Figure 3 Schematic structural diagram of the telescopic box of the present invention; Figure 4 Schematic structural diagram of the interior of the telescopic box of the present invention; Figure 5 Schematic structural diagram of the expansion component and the telescopic rod of the present invention; Figure 6 Schematic structural diagram of the expansion component of the present invention; Figure 7 Schematic structural diagram of the interior of the release component of the present invention; Figure 8 Schematic structural diagram of the interior of the telescopic box of the present invention; Figure 9 Schematic structural diagram of the flow cutoff mechanism of the present invention; Figure 10 Schematic structural diagram of the interior of the flow cutoff mechanism of the present invention; Figure 11 Schematic structural diagram of the anti-rotation component and the positioning component of the present invention; Figure 12 Schematic structural diagram of the collision component of the present invention.

[0019] Reference numerals: 1, jack; 2, blocking mechanism; 21, connecting block; 211, connecting rod; 22, telescopic box; 23, fixed communication block; 231, curved pipe; 232, communication pipe; 24, expansion component; 241, airbag; 242, communication ring; 243, fixed disk; 25, intercommunication pipe; 26, release component; 261, release pipe; 262, release hole; 263, spacer; 264, sealing disk; 265, intermittent rod; 266, sliding disk; 27, telescopic rod; 28, storage box; 29, tee block; 3, base; 4, oil pumping and suction mechanism; 41, oil storage tank; 42, electric control oil valve; 43, oil pump; 44, oil delivery pipe; 45, oil suction pipe; 5, flow cutoff mechanism; 51, liquid storage tank; 52, box body; 53, valve; 54, contraction rod; 55, anti-rotation component; 551, chassis; 552, breaking block; 553, top disk; 56, positioning component; 561, rotating rod; 562, I-shaped pulley; 563, rope; 57, collision component; 571, communication block; 572, damping telescopic rod; 573, flow concentrating cover; 574, connecting plate; 575, semi-circular cover; 58, liquid pipe. Detailed implementation manners

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Embodiment: Refer to Figures 1 to 12 , an oil return structure of a hydraulic jack, including: a jack 1 and a base 3; a blocking mechanism 2, there are at least two blocking mechanisms 2, and the two blocking mechanisms 2 are symmetrically arranged with the jack 1 as the center. The blocking mechanism 2 includes a fixed communication block 23 arranged on the outer peripheral surface of the jack 1. The upper end surface of the fixed communication block 23 is fixedly connected with a telescopic box 22. One side of the telescopic box 22 away from the fixed communication block 23 is fixedly connected with a connection block 21. A plurality of sets of liquid storage boxes 28 are linearly arranged in an array on the inner wall of the telescopic box 22. A plurality of expansion components 24 and a plurality of sets of telescopic rods 27 are alternately arranged on the opposite surfaces of the connection block 21 and the fixed communication block 23. A plurality of release components 26 are arranged in an annular array on the outer peripheral surface of the expansion component 24; a flow cutoff mechanism 5, the flow cutoff mechanism 5 includes a liquid storage box 51 and a box body 52 fixedly connected to the upper end surface of the base 3. A collision component 57 is arranged on one side of the box body 52 facing the jack 1. Two positioning components 56, two valves 53, and a plurality of contraction rods 54 are sequentially arranged on one side of the inner part of the box body 52 facing the collision component 57. A rotation blocking component 55 corresponding to the positioning component 56 is arranged on the upper end surface of the box body 52.

[0023] The fixed communication block 23 in the blocking mechanism 2 is used to fix the telescopic box 22, and the telescopic box 22 is synchronously contracted as the jack 1 expands and contracts through the connection block 21. While the telescopic box 22 contracts, the expansion component 24 and the telescopic rod 27 located inside the telescopic box 22 also contract and expand synchronously. With the expansion of the expansion component 24, when the jack 1 has a cylinder burst, the telescopic box 22 supports the heavy object lifted by the jack 1 to avoid the threat caused by the falling of the heavy object. The flow cutoff mechanism 5 is used to prevent the liquid sucked during the expansion of the expansion component 24 from flowing back into the liquid storage box 51 when the jack 1 has a cylinder burst. Among them, the contraction rod 54 cooperates with the positioning component 56 to fix the valve 53 in the open state and closes the valve 53 when the expansion component 24 is compressed by the pressure of the heavy object. The rotation blocking component 55 determines the force required to close the valve 53.

[0024] Refer to Figures 1 to 4, the jack 1 is composed of an oil cylinder and a piston. The fixed connecting block 23 is fixedly connected to the bottom of the outer peripheral surface of the oil cylinder. A curved pipe 231 is fixedly connected to one side of the fixed connecting block 23. A connecting pipe 232 is fixedly connected to the upper end surface of the fixed connecting block 23. A tee block 29 is fixedly connected to the outer peripheral surface of the oil cylinder between the two blocking mechanisms 2. Two of the ports of the tee block 29 are communicated with the other end of the curved pipe 231; The telescopic box 22 is composed of multiple installation boxes and multiple elastic boxes alternating with each other. And each group of storage boxes 28 has four. The storage boxes 28 correspond to the installation boxes and are fixedly connected to the inner walls around the installation boxes. Compressed powder is stored in the storage boxes 28. A connecting rod 211 is fixedly connected to the side of the connecting block 21 facing the piston. The connecting rod 211 is fixedly connected to the top of the outer peripheral surface of the piston.

[0025] The tee block 29 is used to realize the connection with the flow cutoff mechanism 5, and through the connection of the connecting rod 211 with the piston, the connecting rod 211 drives the connecting block 21 and the piston to move synchronously. The movement of the connecting block 21 will keep the extension and contraction of the telescopic box 22 consistent with the rise and fall of the piston in the oil cylinder.

[0026] Refer to Figures 4 to 6 , multiple expansion components 24 include two air bags 241 and a connecting ring 242. The connecting ring 242 is fixedly connected between the two air bags 241. A fixing plate 243 is fixedly connected to the side of each air bag 241 away from the connecting ring 242. The fixing plate 243 close to the fixed connecting block 23 is fixedly connected to the upper end surface of the fixed connecting block 23. And the other end of the connecting pipe 232 penetrates through the fixing plate 243 and is communicated with the corresponding air bag 241. The fixing plate 243 close to the connecting block 21 is fixedly connected to the bottom of the connecting block 21. Each group of telescopic rods 27 has multiple, and both ends of the telescopic rods 27 are fixedly connected to the opposite surfaces of adjacent two fixing plates 243. An intercommunication pipe 25 is fixedly connected between the adjacent two fixing plates 243, and both ends of the intercommunication pipe 25 penetrate through the fixing plate 243 and are communicated with the air bag 241.

[0027] The connecting ring 242 is used to realize the mutual connection of the two air bags 241. As the telescopic box 22 extends and contracts, the air bags 241 are also compressed and expanded accordingly. The telescopic rods 27 are used to keep a distance between the air bags 241 driven in the adjacent two expansion components 24. When the telescopic box 22 contracts, they also contract and squeeze the air bags 241.

[0028] Refer to Figures 6 to 8, the release component 26 includes a release pipe 261 fixedly connected to the outer peripheral surface of the fixed disk 243. An inner peripheral surface of one end of the release pipe 261 close to the fixed disk 243 is fixedly connected with a plurality of partitions 263 in an annular array. A sliding disk 266 is in contact with the common side of the partitions 263 away from the fixed disk 243, and the sliding disk 266 is hermetically and slidably connected to the inner peripheral surface of the release pipe 261. The other end of the release pipe 261 is fixedly connected with a sealing disk 264. A discontinuous rod 265 is fixedly connected to the center position of the opposite surface of the sealing disk 264 and the sliding disk 266. A plurality of release holes 262 are formed in an annular array on the outer peripheral surface of the release pipe 261 where the discontinuous rod 265 is located.

[0029] When the airbag 241 is affected by the cylinder block explosion of the oil cylinder and the piston transfers the pressure to the telescopic box 22 by using the release component 26, when the expansion component is under a large pressure from a heavy object, the liquid in the liquid storage tank 51 absorbed by the airbag 241 is discharged into the telescopic box 22 through the release pipe 261. When the airbag 241 is under a large pressure, it will first act on the sliding disk 266, so that the sliding disk 266 is affected by the liquid discharged from the airbag 241, and then the discontinuous rod 265 supporting the sliding disk 266 to slide in the release pipe 261 breaks.

[0030] Refer to Figures 9 to 10 , Figure 12 , the collision component 57 includes a communication block 571 fixedly connected to one side of the box body 52 facing the jack 1. One side of the communication block 571 facing the box body 52 penetrates the box body 52 and extends into the interior of the box body 52. A liquid pipe 58 is fixedly connected to the side of the communication block 571 away from the box body 52. The other end of the liquid pipe 58 is communicated with another port of the three-way block 29. A communication port communicated with the liquid pipe 58 is formed on one side of the communication block 571 located inside the box body 52. Damping telescopic rods 572 are fixedly connected to the four surrounding sides of the communication block 571 located inside the box body 52. The telescopic ends of the damping telescopic rods 572 are fixedly connected to a connecting plate 574 together. A flow concentrating cover 573 is fixedly connected to one side of the connecting plate 574 facing the communication block 571, and the flow concentrating cover 573 corresponds to the communication port. Two semi-circular covers 575 are symmetrically fixedly connected to the other side of the connecting plate 574.

[0031] The liquid pipe 58 of the communication block 571 in the collision component 57 is communicated with the three-way block 29, and the communication between the box body 52 and the expansion component 24 is realized through the communication port in the communication block 571. When the airbag 241 of the expansion component 24 is under the pressure of a heavy object, the airbag 241 flows back to the communication block 571 under the pressure of the heavy object, and the liquid with moving impact force impacts the flow concentrating cover 573. The flow concentrating cover 573 acts on the connecting plate 574 when being impacted, so that the connecting plate 574 reaches the pulling force to extend the damping telescopic rods 572, and the connecting plate 574 collides with the two corresponding valves 53 in the open state through the semi-circular covers 575 on both sides.

[0032] Reference Figure 1 、 Figures 10 to 11 The valve 53 is hermetically hinged to the inside of the box body 52. The positioning component 56 includes a rotating rod 561 rotatably connected to the inner bottom of the box body 52. At least two spools 562 are fixedly connected to the rod body of the rotating rod 561 in a linear array. A rope 563 is wound in the notch of the spool 562. One end of the rope 563 is fixedly connected to the inner wall of the box body 52 on one side of the communication block 571, and the other end of the rope 563 is fixedly connected to the valve 53; The retractable rod 54 is fixedly connected to the end of the valve 53 away from the rope 563, and the other end of the retractable rod 54 is fixedly connected to the inner wall of the liquid storage tank 51 of the box body 52. One side of the box body 52 facing the liquid storage tank 51 is communicated with the liquid storage tank 51 through a pipeline, and a reaction liquid is stored inside the liquid storage tank 51.

[0033] By using the rope 563 of the spool 562 in the positioning component 56 in cooperation with the retractable rod 54, the position of the valve 53 in the initial open state is fixed, so that when the cylinder does not burst and the piston rises and falls normally, the piston rises normally and the liquid reaction liquid in the liquid storage tank 51 is transported to the blocking mechanism 2 through the box body 52, and the liquid reaction liquid that flows back to the box body 52 when the piston of the blocking mechanism 2 descends normally will not cause the open valve 53 to close. Furthermore, when the cylinder bursts and the piston exerts all the pressure of the lifted heavy object on the blocking mechanism 2.

[0034] Reference Figures 9 to 11 The rotation blocking component 55 includes a chassis 551 rotatably connected to the inner top of the box body 52. The bottom of the chassis 551 is fixedly connected to the other end of the rotating rod 561. A plurality of breaking blocks 552 are fixedly connected to the upper end surface of the chassis 551 in a circular array. The upper end surfaces of the breaking blocks 552 are jointly fixedly connected to a top plate 553, and the top plate 553 is fixedly connected to the top of the box body 52.

[0035] By using the chassis 551 and the rotating rod 561 in the rotation blocking component 55, the rotation of the rotating rod 561 is restricted by the breaking blocks 552, and the breaking blocks 552 are connected to the top plate 553. Furthermore, only when the rotating rod 561 receives the force that causes the breaking blocks 552 to break when the rope 563 drawn out by the spool 562 reaches a certain value can the rotating rod 561 rotate, and the rope 563 can be drawn out from the spool 562 to achieve the purpose of closing the valve 53.

[0036] Reference Figures 1 to 2, further comprising an oil suction and discharge mechanism 4, the oil suction and discharge mechanism 4 includes an oil storage tank 41 fixedly connected to the upper end surface of the base 3, a controller is installed on the side of the oil storage tank 41, an electric control oil valve 42 and an oil pump 43 are fixedly connected to the upper end surface of the oil storage tank 41, and the electric control oil valve 42 is electrically connected to the controller. The electric control oil valve 42 has a main port, an input end, and an output end. The output end of the electric control oil valve 42 is fixedly communicated with an oil delivery pipe 44, and the other end of the oil delivery pipe 44 is communicated with the oil delivery end of the oil cylinder. The input end of the electric control oil valve 42 is fixedly connected with an oil suction pipe 45, and the other end of the oil suction pipe 45 is communicated with the oil outlet end of the oil cylinder; The main port of the electric control oil valve 42 is fixedly communicated with the output end of the oil pump 43 through a pipeline, and the input end of the oil pump 43 is fixedly communicated with the oil storage tank 41 through a pipeline.

[0037] By using the forward-rotating oil pump 43 in the oil suction and discharge mechanism 4, the hydraulic oil in the oil storage tank 41 can be delivered to the output end of the electric control oil valve 42 and then to the output end of the oil cylinder through the oil delivery pipe 44, thereby raising the piston. When the oil pump 43 rotates in reverse, the suction force of the oil pump 43 sucks the hydraulic oil of the oil cylinder through the oil suction pipe 45 at the input end of the electric control oil valve 42, thereby lowering the piston.

[0038] The operation principle of this embodiment is specifically as follows: The first step: First, when it is necessary to use the jack 1 to lift a heavy object, the operator issues an instruction through the controller to start the oil pump 43 to rotate forward. Thus, the hydraulic oil in the oil storage tank 41 is sucked into the electric control oil valve 42 through the oil pump 43. Under the control of the controller, the electric control oil valve 42 opens the connection between the main port and the output end, so that the hydraulic oil is delivered to the oil delivery end of the oil cylinder through the oil delivery pipe 44 and enters the oil cylinder. As the oil pump 43 continuously delivers the hydraulic oil into the oil cylinder through the electric control oil valve 42 and the oil delivery pipe 44, the hydraulic oil will push the piston upward in the oil cylinder, thereby realizing the function of the jack to lift the heavy object. During this process, the pressure in the oil cylinder gradually increases, the piston rises steadily, and the heavy object is smoothly lifted until the required lifting height is reached. The operator stops the operation of the oil pump 43 through the controller. At the same time, the electric control oil valve 42 disconnects the connection between the main port and the output end, so that the hydraulic oil in the oil cylinder cannot flow back into the oil storage tank 41 again; When it is necessary to lower the piston, the operator issues an instruction through the controller to control the oil pump 43 to rotate in reverse. At this time, the controller connects the main port and the input end. When the oil pump 43 rotates in reverse, the generated suction force sucks the hydraulic oil in the oil cylinder back into the oil storage tank 41 through the oil suction pipe 45, and as the oil pump 43 continuously sucks the hydraulic oil in the oil cylinder into the oil storage tank 41, the piston slowly descends under the action of the gravity of the heavy object.

[0039] It should be particularly noted that the forward and reverse rotation powers of the oil pump 43 determine the rising and falling speeds of the piston, and the forward and reverse rotation powers of the oil pump 43 are customized by the operator in the controller according to the actual usage situation.

[0040] Step 2: During the process of the jack 1 lifting a heavy object, when the oil cylinder explodes (the main reasons for the oil cylinder to explode are: long-term operation will cause the inside of the oil cylinder to bear huge pressure, and frequent pressure changes are likely to cause fatigue of the cylinder body material, resulting in tiny cracks and then explosion), the sealing structure inside the oil cylinder is damaged, and a large amount of oil leaks instantaneously, causing the piston to lose the supporting force of the oil. According to the principle of force transmission, the heavy object pressure borne by the piston is directly transmitted to the connecting block 21 through the connecting rod 211. The connecting block 21 is fixedly connected to the telescopic box 22, and under the action of the huge pressure, it drives the telescopic box 22 to contract rapidly.

[0041] Among them, in the normal working state (when the oil cylinder does not explode), the telescopic box 22 will expand and contract synchronously with the piston's lifting and lowering in the oil cylinder. The telescopic box 22 is composed of multiple mounting boxes and multiple elastic boxes alternating with each other, and this structure enables the telescopic box 22 to have good telescopic performance. When the telescopic box 22 expands (during the piston's upward movement): the expansion component 24 inside it will also expand accordingly. The expansion component 24 is connected to the liquid storage tank 51 of the flow cut-off mechanism 5 through the connecting pipe 232. When the airbag 241 of the expansion component 24 expands under the tensile force during the expansion of the telescopic box 22, according to the principle of communicating vessels, the reaction liquid in the liquid storage tank 51 flows into the airbag 241 through the connecting pipe 232 under the action of the pressure difference, causing the airbag 241 to expand. When the telescopic box 22 contracts (during the piston's downward movement): the airbag 241 of the expansion component 24 is subjected to the extrusion force during the contraction of the telescopic box 22, and its volume decreases driven by the contraction of the telescopic rod 27; since the airbag 241 has previously absorbed the reaction liquid in the liquid storage tank 51 and the internal pressure increases at this time, and the reaction liquid has a tendency to flow back, so the reaction liquid in the airbag 241 flows back into the liquid storage tank 51 through the connecting pipe 232.

[0042] Note: At this time, the pressure borne by the airbag 241 of the expansion component 24 has not reached the trigger value of the release component 26, so the release component 26 remains in the closed state, and the reaction liquid in the airbag 241 will not be discharged from the release hole 262.

[0043] When the oil cylinder explodes: The oil in the oil cylinder leaks instantaneously, causing the piston to lose the support of the oil. Then the pressure of the heavy object is transmitted to the connecting block 21 through the connecting rod 211. Under the huge pressure of the heavy object, the connecting block 21 drives the telescopic box 22 to contract rapidly. During the contraction of the telescopic box 22, the internal expansion component 24 is squeezed by a large pressure. Since the airbag 241 of the expansion component 24 has absorbed the reaction liquid during normal operation, after being squeezed, the pressure in the airbag 241 rises sharply (at this time, the pressure value in the airbag 241 has reached the condition for triggering the release component 26). This pressure acts on the sliding disk 266 of the release component 26. The sliding disk 266 is hermetically and slidably connected to the inner peripheral surface of the release pipe 261 and was originally in contact with the separator 263. Therefore, the pressure in the airbag 241 pushes the sliding disk 266, causing it to overcome the resistance of the separator 263 and move along the release pipe 261 towards the sealing disk 264, thereby pushing the intermittent rod 265. However, since the pressure of the airbag 241 pushing the sliding disk 266 has reached the fracture value of the intermittent rod 265, the intermittent rod 265 will break accordingly. At this time, the sliding disk 266 loses the clamping of the separator 263 and the intermittent rod 265, and under the continuous push of the pressure in the airbag 241, it quickly moves towards the release hole 262. After the sliding disk 266 moves towards the release hole 262, the reaction liquid in the airbag 241 is discharged from the release hole 262, enters the telescopic box 22, and reacts chemically with the compressed powder stored in the storage box 28 inside the telescopic box 22, generating a large amount of gas. These gases quickly fill the telescopic box 22, causing the internal air pressure of the telescopic box 22 to increase sharply, providing a strong additional supporting force for the piston through the connecting block 21 and the connecting rod 211, slowing down the descent speed of the piston and preventing the heavy object from falling rapidly.

[0044] Among them, 1): Examples of the compressed powder and the reaction liquid are given as follows: Example 1: The compressed powder is: sodium bicarbonate (NaHCO 3 ); The reaction liquid is: dilute sulfuric acid (H 2 SO 4 ); Chemical reaction: When the dilute sulfuric acid solution in the airbag 241 is discharged through the release component 26 and contacts the sodium bicarbonate powder in the storage box 28, a chemical reaction will occur: H 2 SO 4 + 2NaHCO 3 →Na 2 SO 4 + 2H 2 O + 2CO 2 ↑; This reaction will rapidly generate a large amount of carbon dioxide gas, filling the telescopic box 22, increasing the air pressure in the box, and then providing an additional supporting force for the piston through the connecting block 21 and the connecting rod 211.

[0045] Example 2: The compressed powder is calcium carbonate (CaCO 3 ); The reaction solution is dilute hydrochloric acid (HCl); Chemical reaction: When the dilute hydrochloric acid solution meets the calcium carbonate powder, the following chemical reaction occurs: CaCO 3 + 2HCl → CaCl 2 + H 2 O + CO 2 ↑. The carbon dioxide gas generated by the reaction quickly fills the telescopic box 22, increasing the internal air pressure of the telescopic box 22, thereby providing additional support for the piston and preventing the heavy object from falling rapidly due to the piston losing the support of the hydraulic fluid.

[0046] 2): An example of the pressure value of the airbag 241 corresponding to the fracture of the intermittent rod 265 is given: For example, the minimum lifting weight of the jack 1 in this solution is 500 kg, the maximum lifting weight is 3 tons, and the gravitational acceleration is taken as 9.8 N / kg. Then the gravity of the heavy object is 500 × 9.8 = 4900 N. Assuming that the effective bearing area of the airbag 241 is 0.002 square meters, at the moment of cylinder explosion, the pressure is evenly distributed on the bearing surface of the airbag 241. According to the pressure formula P = F / S (P is the pressure, F is the force, and S is the stress area), the pressure inside the airbag 241 at this time is 4900 ÷ 0.002 = 2450000 Pa, that is, 2.45 MPa. If the intermittent rod 265 is designed to break at about 2.5 MPa, when the pressure inside the airbag 241 reaches this value, the intermittent rod 265 breaks and the release assembly 26 starts to work.

[0047] Step 3: While the expansion component 24 is being squeezed, the reaction liquid in the airbag 241 will first flow back to the connection block 571 through the liquid pipe 58 due to the pressure. The flowing-back reaction liquid also has a great impact force (reason: when the expansion component 24 is squeezed, the reaction liquid in the internal airbag 241 is compressed, breaking the originally relatively stable storage state. Since there is a communication channel between the airbag 241 and the connection block 571, and the pressure in the airbag 241 rises sharply under the squeeze, according to Pascal's law, the liquid can transmit pressure evenly, which enables the reaction liquid to accumulate a strong pressure energy in a narrow space. When the cylinder bursts and the piston loses support, and the heavy object pressure causes the expansion component 24 to be quickly squeezed, the reaction liquid instantly obtains a great kinetic energy and rushes towards the connection block 571 at a high speed. Moreover, during the flowing-back process of the reaction liquid, the factors such as the change in the cross-sectional area of the channel and the friction between components have relatively little hindrance to it, further ensuring that the reaction liquid can maintain a relatively large flow rate. Therefore, the flowing-back reaction liquid has a great impact force). At this time, the reaction liquid will impact the flow-condensing cover 573. Since the flow-condensing cover 573 is fixedly connected to the connection plate 574, according to the principle that the action of force is mutual, the flow-condensing cover 573 receives the impact and reaches the force required for the damping telescopic rod 572 to extend, thereby driving the connection plate 574 to move, so that the connection plate 574 collides with the valve 53 through the semi-circular covers 575 on both sides; Among them, the valve 53 is connected to the box body 52 through an airtight hinge. During normal operation (when the oil cylinder does not burst and the force of the piston lifting the heavy object does not act on the blocking mechanism 2), the valve 53 is kept in the open state by the winding wheel 562, the rope 563 of the positioning component 56 and the retractable rod 54 together. At this time, the reaction liquid in the airbag 241 in the blocking mechanism 2 will not reach the locking of the valve 53 in the open state by the winding wheel 562, the rope 563 and the retractable rod 54 as the piston rises and falls; When the oil cylinder bursts and the connection plate 574 collides with the valve 53 through the semi-circular cover 575, the collision force changes the winding state of the rope 563 on the winding wheel 562, and the rope 563 begins to be drawn out from the winding wheel 562. As the rope 563 is drawn out, it drives the rotating rod 561 to rotate; It should be noted specifically that during normal operation, the breaking block 552 restricts the rotation of the rotating rod 561, and the force of the flowing reaction liquid at this time is not sufficient to break the breaking block 552. However, the force generated when the semi-circular cover 575 collides with the valve 53 breaks the breaking block 552, enabling the rotating rod 561 to rotate and driving the winding wheel 562 to continuously release the rope 563.

[0048] Among them, during the process of the rope 563 being drawn out and the rotating rod 561 rotating, the retractable rod 54 contracts, and the valve 53 loses the traction of the rope 563 and the support of the retractable rod 54, and rotates around the airtight hinge under the action of the collision force and gradually closes.

[0049] After the valve 53 is closed, the channel for the reaction liquid to flow back from the box body 52 to the liquid storage tank 51 is completely blocked. At this time, the reaction liquid in the expansion assembly 24 cannot flow back and can only act on the release assembly 26 and be discharged from the release assembly 26, so as to realize the reaction between the reaction liquid and the compressed powder in the packing box 28 in the telescopic box 22 to generate gas, maintain the supporting force for the piston, prevent the heavy object from falling, and ensure the safety of the equipment and personnel.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil return structure of a hydraulic jack, characterized in that: include: A jack (1) and a base (3); A blocking mechanism (2), wherein the blocking mechanism (2) has at least two blocking mechanisms (2), and the two blocking mechanisms (2) are symmetrically arranged with the jack (1) as the center, the blocking mechanism (2) comprises a fixed connecting block (23) arranged on the outer peripheral surface of the jack (1), the upper end surface of the fixed connecting block (23) is fixedly connected to a telescopic box (22), the side of the telescopic box (22) away from the fixed connecting block (23) is fixedly connected to a connecting block (21), the inner wall of the telescopic box (22) is linearly arranged with a plurality of groups of containing boxes (28), the opposite surfaces of the connecting block (21) and the fixed connecting block (23) are alternately arranged with a plurality of expansion components (24) and a plurality of groups of telescopic rods (27), and the outer peripheral surface of the expansion component (24) is annularly arranged with a plurality of release components (26); A flow cut-off mechanism (5), the flow cut-off mechanism (5) comprising a liquid storage box (51) and a box body (52) fixedly connected to the upper end surface of a base (3); a collision component (57) is arranged on a side of the box body (52) facing the jack (1); two positioning components (56), two valves (53) and a plurality of retractable rods (54) are arranged in sequence on a side of the box body (52) facing the collision component (57); and a rotation-blocking component (55) corresponding to the positioning component (56) is arranged on the upper end surface of the box body (52).

2. The oil return structure of a hydraulic jack according to claim 1, characterized in that: The jack (1) is composed of an oil cylinder and a piston. The fixed connecting block (23) is fixedly connected to the bottom of the outer peripheral surface of the oil cylinder. A curved pipe (231) is fixedly connected to one side of the fixed connecting block (23). A connecting pipe (232) is fixedly connected to the upper end surface of the fixed connecting block (23). A three-way block (29) is fixedly connected to the outer peripheral surface of the oil cylinder located between the two blocking mechanisms (2). Two ports of the three-way block (29) are connected to the other end of the curved pipe (231).

3. The oil return structure of a hydraulic jack according to claim 2, characterized in that: The telescopic box (22) is composed of a plurality of installation boxes and a plurality of elastic boxes that are alternately formed, and each group of containing boxes (28) has four containing boxes. The containing boxes (28) correspond to the installation boxes and are fixedly connected to the inner walls of the installation boxes. Compressed powder is stored in the containing boxes (28). A connecting rod (211) is fixedly connected to the side of the connecting block (21) facing the piston, and the connecting rod (211) is fixedly connected to the top of the outer peripheral surface of the piston.

4. The oil return structure of a hydraulic jack according to claim 1, characterized in that: The plurality of expansion components (24) include two air bags (241) and a connecting ring (242), wherein the connecting ring (242) is fixedly connected between the two air bags (241), and a fixed plate (243) is fixedly connected to a side of each air bag (241) away from the connecting ring (242), and the fixed plate (243) close to the fixed connecting block (23) is fixedly connected to an upper end surface of the fixed connecting block (23), and the other end of the connecting pipe (232) passes through the fixed plate (24 3) being connected to the corresponding airbag (241), the fixed plate (243) close to the connecting block (21) is fixedly connected to the bottom of the connecting block (21), each group of the telescopic rods (27) has a plurality of them, and the two ends of the telescopic rods (27) are fixedly connected to the opposite surfaces of two adjacent fixed plates (243), an interconnecting tube (25) is fixedly connected between the two adjacent fixed plates (243), and both ends of the interconnecting tube (25) pass through the fixed plate (243) and are connected to the airbag (241).

5. The oil return structure of a hydraulic jack according to claim 1, characterized in that: The release assembly (26) comprises a release tube (261) fixedly connected to the outer circumference of the fixed disk (243); the inner circumference of the release tube (261) close to one end of the fixed disk (243) is fixedly connected to a plurality of spacers (263) in an annular array; the side of the spacers (263) away from the fixed disk (243) is in common contact with a sliding disk (266); the sliding disk (266) and the inner circumference of the release tube (261) are airtightly slidably connected; the other end of the release tube (261) is fixedly connected to a sealing disk (264); the sealing disk (264) and the sliding disk (266) are fixedly connected to an intermittent rod (265) at the center of the opposite surface of the sliding disk (266); and the release tube (261) is provided with a plurality of release holes (262) in an annular array on the outer circumference of the intermittent rod (265).

6. The oil return structure of a hydraulic jack according to claim 1, characterized in that: The collision assembly (57) comprises a connecting block (571) fixedly connected to a side of the box (52) facing the jack (1); the side of the connecting block (571) facing the box (52) penetrates the box (52) and extends into the interior of the box (52); a side of the connecting block (571) away from the box (52) is fixedly connected to a liquid pipe (58); the other end of the liquid pipe (58) is connected to another port of the three-way block (29); and a side of the connecting block (571) located inside the box (52) is provided with a liquid pipe (58) connected to the three-way block (29). The connecting block (571) is located on one side of the box body (52), and is fixedly connected to damping telescopic rods (572) on all sides thereof. The telescopic ends of the damping telescopic rods (572) are fixedly connected to a connecting plate (574). The connecting plate (574) is fixedly connected to a flow collecting cover (573) on one side facing the connecting block (571), and the flow collecting cover (573) corresponds to the connecting port. The other side of the connecting plate (574) is symmetrically fixedly connected to two semi-arc covers (575).

7. The oil return structure of a hydraulic jack according to claim 1, characterized in that: The valve (53) is connected to the inner airtight hinge of the box body (52); the positioning assembly (56) comprises a rotating rod (561) rotatably connected to the bottom of the box body (52); the rod body of the rotating rod (561) is fixedly connected to at least two I-shaped wheels (562) in a linear array; a rope (563) is wound in a notch of the I-shaped wheel (562); one end of the rope (563) is fixedly connected to the inner wall of the box body (52) located on one side of the connecting block (571); and the other end of the rope (563) is fixedly connected to the valve (53).

8. The oil return structure of a hydraulic jack according to claim 7, characterized in that: The retractable rod (54) is fixedly connected to one end of the valve (53) away from the rope (563), and the other end of the retractable rod (54) is fixedly connected to the inner wall of the liquid storage box (51) of the box body (52), and the side of the box body (52) facing the liquid storage box (51) is connected to the liquid storage box (51) through a pipeline, and the liquid storage box (51) stores reaction liquid inside.

9. The oil return structure of a hydraulic jack according to claim 1, characterized in that: The anti-rotation assembly (55) comprises a chassis (551) rotatably connected to the top of the box (52); the bottom of the chassis (551) is fixedly connected to the other end of the rotating rod (561); a plurality of broken blocks (552) are fixedly connected in an annular array to the upper end surface of the chassis (551); the upper end surfaces of the broken blocks (552) are commonly fixedly connected to a top plate (553); and the top plate (553) is fixedly connected to the top of the box (52).

10. The oil return structure of a hydraulic jack according to claim 1, characterized in that: It also includes an oil delivery and suction mechanism (4), the oil delivery and suction mechanism (4) including an oil storage tank (41) fixedly connected to the upper end surface of the base (3), a controller installed on the side of the oil storage tank (41), an electric oil control valve (42) and an oil pump (43) fixedly connected to the upper end surface of the oil storage tank (41), and the electric oil control valve (42) is electrically connected to the controller, the electric oil control valve (42) has a main port, an input end, and an output end, the output end of the electric oil control valve (42) is fixedly connected to an oil delivery pipe (44), and the other end of the oil delivery pipe (44) is connected to the oil delivery end of the oil cylinder, the input end of the electric oil control valve (42) is fixedly connected to an oil suction pipe (45), and the other end of the oil suction pipe (45) is connected to the oil outlet end of the oil cylinder; The main port of the electric oil control valve (42) is fixedly connected to the output end of the oil pump (43) through a pipeline, and the input end of the oil pump (43) is fixedly connected to the oil storage tank (41) through a pipeline.

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