An oil return structure of a hydraulic jack

Abstract

The present invention relates to the technical field of jacks, and particularly relates to an oil return structure of a hydraulic jack, including: a jack and a base; a blocking mechanism, there are 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, and a telescopic box is fixedly connected to the upper end surface of the fixed communication block. Through the telescopic box, the expansion component and the release component in the blocking mechanism, it is possible to provide additional support for 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 oil, thereby effectively avoiding the heavy object lifted by the piston from falling due to the loss of oil support, ensuring the safety of personnel, reducing equipment damage and property losses caused by the falling of heavy objects, ensuring the stability of the working process, avoiding work interruption and production stagnation caused by sudden cylinder explosion events, and maintaining the continuity and efficiency of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of jacks, and in particular 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 oil return valve is opened to provide an oil return channel for the oil. The check valve prevents reverse flow, and the oil pipe ensures the oil circulation to achieve oil return. Hydraulic jacks are divided into manual and electric types. The manual type is driven by manually operating the oil pump handle to lift the oil. It has a simple structure and low cost, and is suitable for lifting lighter objects but has low efficiency. The electric type is powered by an electric motor, has a fast lifting speed, is labor-saving and has a high degree of automation, is suitable for lifting heavier objects, and is suitable for scenarios with high requirements for work efficiency and operation.

[0003] When the existing electric hydraulic jack is lifting a heavy object of 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 cause damage to surrounding equipment and facilities, resulting in property losses at the work site, and will 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 problem that when the oil cylinder of the prior art explodes, it is impossible to continuously provide a driving force for the piston, causing the heavy object to suddenly lose support and causing the workers below to be injured.

[0005] To achieve the above object, the present invention is realized through the following technical solutions:

[0006] The present invention provides an oil return structure of a hydraulic jack, including:

[0007] A jack and a base;

[0008] Blocking mechanism, there are at least two of the 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 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. One side of the fixed communication block is fixedly communicated with a curved pipe, and the upper end surface of the fixed communication block is fixedly communicated with a communication pipe. The outer peripheral surface of the oil cylinder between the two blocking mechanisms is fixedly connected with a three-way block. Two of the ports of the three-way block are communicated with the other end of the curved pipe. The upper end surface of the fixed communication block is fixedly connected with a telescopic box. The telescopic box is fixedly connected with a connecting block on the side away from the fixed communication block. A plurality of sets of storage boxes are linearly arranged on the inner wall of the telescopic box. Compressed powder is stored in the storage box. A plurality of expansion components and multiple sets of telescopic rods are alternately arranged on the opposite surfaces of the connecting block and the fixed communication block. Each set of telescopic rods has a plurality of them, and both ends of the telescopic rods 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 the fixed disks and are communicated with the airbag. A plurality of release components are annularly arranged on the outer peripheral surface of the expansion component;

[0009] 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 the side of the box body facing the jack. On the side of the box body interior facing the collision component, two positioning components, two valves and a plurality of contraction rods are sequentially arranged. A rotation blocking component corresponding to the positioning component is arranged on the upper end surface of the box body;

[0010] The collision component includes a communication block fixedly connected to the side of the box body facing the jack. The communication block penetrates the box body and extends into the box body interior on the side facing the box body. The other side of the communication block away from the box body is fixedly communicated with a liquid pipe, and the other end of the liquid pipe is communicated with the other port of the three-way block;

[0011] The valve is hermetically hinged to the interior of the box body. The positioning component includes a rotating rod rotatably connected to the inner bottom of the box body. At least two I-shaped wheels are fixedly connected to the rod body of the rotating rod in a linear array. 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] 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 box body. The 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 telescopic box is composed of multiple mounting boxes and multiple elastic boxes alternating with each other, and each set of storage boxes has four. The storage boxes correspond to the mounting boxes and are fixedly connected to the inner walls around the mounting boxes. One side of the connecting block facing the piston is fixedly connected with a connecting rod, and the connecting rod is fixedly connected to the top of the outer peripheral surface of the piston.

[0014] Preferably, the multiple expansion components include two air bags and a communication ring. The communication ring is fixedly connected between the two air bags. One side of each air bag away from the communication ring is fixedly connected with a fixed disk. 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 communicates with the corresponding air bag. The fixed disk close to the connecting block is fixedly connected to the bottom of the connecting block.

[0015] Preferably, the release component includes a release pipe fixedly connected to the outer peripheral surface of the communication ring. A plurality of partitions 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 partitions away from the fixed disk, and the sliding disk is hermetically slidably connected to 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 central position of the opposite surface of the sealing disk and the sliding disk. A plurality of release holes are formed in an annular array on the outer peripheral surface of the release pipe where the discontinuous rod is located.

[0016] Preferably, a communication port communicating 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 four sides of the communication block located inside the box body. The telescopic ends of the damping telescopic rods are jointly fixedly connected 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 fixedly connected to the other side of the connecting plate.

[0017] Preferably, the rotation prevention component 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 in an annular array on the upper end surface of the chassis. A top disk is jointly fixedly connected to the upper end surfaces of the broken blocks, and the top disk is fixedly connected to the top of the box body.

[0018] 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 connected to an oil delivery pipe, and the other end of the oil delivery pipe communicates with the oil input 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 communicates with the oil output end of the oil cylinder;

[0019] The total port of the electronically controlled 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.

[0020] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art:

[0021] 1. Through the telescopic box, expansion component and release component in the blocking mechanism, it is possible to provide additional support for the piston when the cylinder explodes, so as to prevent the heavy object lifted by the piston from falling due to the loss of oil. Among them, the telescopic box expands and contracts as the piston moves up and down in the cylinder. When the telescopic box expands and contracts, it also drives the expansion component inside it to expand to different degrees. As the expansion component expands, it will absorb the corresponding reaction liquid in the flow cutoff mechanism. When the cylinder explodes and the piston transfers the pressure to the telescopic box, when the expansion component is under the greater pressure of the heavy object, the reaction liquid absorbed by the expansion component is discharged. 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 air pressure inside the telescopic box, and providing additional support for the piston in time. Thus, it effectively prevents the piston from causing the lifted heavy object to fall due to the loss of oil 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, avoids work interruption and production stagnation caused by sudden cylinder explosion events, and maintains the continuity and efficiency of the operation.

[0022] 2. Through the valve, contraction rod, anti-rotation component, positioning component and collision component in the flow cutoff mechanism, when the expansion component is under the greater pressure of the heavy object, the valve is 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 anti-rotation 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, to prevent the reaction liquid from flowing through the valve under normal conditions and causing the valve to close, and to avoid the valve being wrongly closed due to accidental factors when the reaction liquid is flowing normally. Description of the Drawings

[0023] 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 drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic structural diagram of the whole of the present invention;

[0025] Figure 2 Schematic structural diagram of the blocking mechanism of the present invention;

[0026] Figure 3 Schematic structural diagram of the telescopic box of the present invention;

[0027] Figure 4 Schematic structural diagram of the interior of the telescopic box of the present invention;

[0028] Figure 5 Schematic structural diagram of the expansion component and the telescopic rod of the present invention;

[0029] Figure 6 Schematic structural diagram of the expansion component of the present invention;

[0030] Figure 7 Schematic structural diagram of the interior of the release component of the present invention;

[0031] Figure 8 Schematic structural diagram of the interior of the telescopic box of the present invention;

[0032] Figure 9 Schematic structural diagram of the flow cutoff mechanism of the present invention;

[0033] Figure 10 Schematic structural diagram of the interior of the flow cutoff mechanism of the present invention;

[0034] Figure 11 Schematic structural diagram of the rotation blocking component and the positioning component of the present invention;

[0035] Figure 12 Schematic structural diagram of the collision component of the present invention.

[0036] Figure numerals: 1, jack; 2, blocking mechanism; 21, connecting block; 211, connecting rod; 22, telescopic box; 23, fixed connecting block; 231, curved pipe; 232, connecting pipe; 24, expansion assembly; 241, airbag; 242, connecting ring; 243, fixed disk; 25, interconnecting pipe; 26, release assembly; 261, release pipe; 262, release hole; 263, spacer; 264, sealing disk; 265, interrupter rod; 266, sliding disk; 27, telescopic rod; 28, container box; 29, three-way block; 3, base; 4, suction and delivery Oil mechanism; 41, oil storage tank; 42, electric oil valve; 43, oil pump; 44, oil pipeline; 45, oil suction pipe; 5, flow cut-off mechanism; 51, liquid storage tank; 52, box body; 53, valve; 54, retractable rod; 55, anti-rotation assembly; 551, chassis; 552, breaking block; 553, top plate; 56, positioning assembly; 561, rotating rod; 562, I-shaped wheel; 563, rope; 57, collision assembly; 571, connecting block; 572, damping telescopic rod; 573, focusing cover; 574, connecting plate; 575, semi-arc cover; 58, liquid pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0038] The present invention will be further described below in conjunction with the embodiments.

[0039] Example: Refer to Figures 1 to 12 , an oil return structure of a hydraulic jack, comprising:

[0040] Jack 1 and base 3;

[0041] 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 includes a fixed connecting block 23 arranged on the outer peripheral surface of the jack 1. 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. One side of the fixed connecting block 23 is fixedly connected with a curved pipe 231, and the upper end surface of the fixed connecting block 23 is fixedly connected with a connecting pipe 232. The outer peripheral surface of the oil cylinder located between the two blocking mechanisms 2 is fixedly connected with a three-way block 29, two ports of the three-way block 29 are connected with the other end of the curved pipe 231, and the upper end surface of the fixed connecting block 23 is fixedly connected with a telescopic box 22. The side of the telescopic box 22 away from the fixed connecting block 23 is fixedly connected with the connecting block 21, and the inner wall of the telescopic box 22 is linearly arrayed with multiple groups of containing boxes 28, and the containing boxes 28 store compressed powder. The opposite surfaces of the connecting block 21 and the fixed connecting block 23 are alternately provided with multiple expansion components 24 and multiple groups of telescopic rods 27, each group of telescopic rods 27 has multiple, and the two ends of the telescopic rods 27 are fixedly connected to the opposite surfaces of two adjacent fixed disks 243, and the two adjacent fixed disks 243 are fixedly connected with an intercommunication tube 25, and the two ends of the intercommunication tube 25 penetrate the fixed disk 243 and communicate with the airbag 241, and the outer peripheral surface of the expansion component 24 is provided with multiple release components 26 in an annular array;

[0042] The flow cut-off 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 assembly 57 is arranged on the side of the box body 52 facing the jack 1. Two positioning assemblies 56, two valves 53 and a plurality of retracting rods 54 are arranged in sequence on the side of the box body 52 facing the collision assembly 57. A rotation-blocking assembly 55 corresponding to the positioning assembly 56 is arranged on the upper end surface of the box body 52.

[0043] The collision assembly 57 includes a connecting block 571 fixedly connected to the side of the box body 52 facing the jack 1, the side of the connecting block 571 facing the box body 52 penetrates the box body 52 and extends to the inside of the box body 52, and the side of the connecting block 571 away from the box body 52 is fixedly connected with a liquid pipe 58, and the other end of the liquid pipe 58 is connected to another port of the three-way block 29;

[0044] The valve 53 is connected to the inner airtight hinge of the box body 52. ​​The positioning assembly 56 includes 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 the groove of the I-shaped wheel 562. One end of the rope 563 is fixedly connected to the inner wall of the box body 52 on one side of the connecting block 571, and the other end of the rope 563 is fixedly connected to the valve 53.

[0045] 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 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 reaction liquid is stored inside the liquid storage box 51.

[0046] The fixed connecting block 23 in the blocking mechanism 2 is used to fix the telescopic box 22, and the connecting block 21 is used to realize that the telescopic box 22 is contracted synchronously with the extension and contraction of the jack 1. When the telescopic box 22 is contracted, the expansion assembly 24 and the telescopic rod 27 inside the telescopic box 22 are also contracted and expanded and compressed synchronously. When the jack 1 explodes, the telescopic box 22 supports the heavy object lifted by the jack 1 with the expansion of the expansion assembly 24, so as to avoid the threat of the heavy object falling. The cut-off mechanism 5 is used to prevent the liquid absorbed by the expansion assembly 24 when it expands from flowing back into the liquid storage box 51 when the jack 1 explodes. The contraction rod 54 cooperates with the positioning assembly 56 to realize the valve 53 in the open state. The anti-rotation assembly 55 determines the force required to close the valve 53 when the expansion assembly 24 is compressed by the pressure of the weight, and uses the rope 563 of the I-wheel 562 in the positioning assembly 56 to cooperate with the retracting rod 54 to fix the position of the open valve 53 in the initial state, so that the open valve 53 can be opened when the cylinder does not explode and the piston rises and falls normally. The piston rises normally and the liquid storage tank 51 transports the liquid reaction liquid to the blocking mechanism 2 through the box body 52, and the piston of the blocking mechanism 2 descends normally and the liquid reaction liquid flows back to the box body 52, which will not close the open valve 53. When the cylinder explodes and the piston causes the pressure of the lifted weight to act entirely on the blocking mechanism 2, the piston of the blocking mechanism 2 will not explode.

[0047] Reference Figures 1 to 4 The telescopic box 22 is composed of a plurality of installation boxes and a plurality of elastic boxes alternating with each other, and each group of containing boxes 28 has four, the containing boxes 28 correspond to the installation boxes, and are fixedly connected to the inner walls of the installation boxes. 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.

[0048] The three-way block 29 is used to connect with the cut-off mechanism 5, and is connected to the piston through the connecting rod 211, so that the connecting rod 211 drives the connecting block 21 and the piston to move synchronously, and 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 cylinder.

[0049] Reference Figures 4 to 6, a plurality of 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 one side of each air bag 241 away from the connecting ring 242. The fixing plate 243 close to the fixing connecting block 23 is fixedly connected to the upper end surface of the fixing connecting block 23, and the other end of the connecting pipe 232 penetrates through the fixing plate 243 and communicates 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.

[0050] 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 compressed and expanded accordingly. The telescopic rod 27 is used to keep a distance between the air bags 241 in two adjacent expansion components 24. When the telescopic box 22 contracts, the telescopic rod 27 also contracts and squeezes the air bags 241.

[0051] Refer to Figures 6 to 8 , the release component 26 includes a release pipe 261 fixedly connected to the outer peripheral surface of the connecting ring 242. A plurality of partitions 263 are fixedly connected to the inner peripheral surface of the release pipe 261 near one end of the fixing plate 243 in an annular array. A sliding disk 266 is in common contact with the side of the partitions 263 away from the fixing plate 243, and the sliding disk 266 is hermetically slidably connected to the inner peripheral surface of the release pipe 261. The other end of the release pipe 261 is fixedly connected to 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 the outer peripheral surface of the release pipe 261 located on the outer peripheral surface of the discontinuous rod 265 in an annular array.

[0052] The release component 26 is used to realize that when the oil cylinder explodes and the piston transfers the pressure to the telescopic box 22, when the expansion component is under a large pressure from a heavy object, the liquid in the liquid storage tank 51 absorbed by the air bag 241 is discharged into the telescopic box 22 through the release pipe 261. When the air bag 241 is under a large pressure, it will first act on the sliding disk 266, so that the sliding disk 266 is acted on by the liquid discharged from the air bag 241, and then the discontinuous rod 265 supporting the sliding disk 266 to slide in the release pipe 261 breaks.

[0053] Refer to Figures 9 to 10 , Figure 12 , one side of the connecting block 571 located inside the box body 52 is provided with a communication port communicating with the liquid pipe 58. Damping telescopic rods 572 are fixedly connected to the four surrounding sides of the side of the connecting 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 the side of the connecting plate 574 facing the connecting block 571, and the flow concentrating cover 573 corresponds to the communication port. Two semi-arc covers 575 are symmetrically fixedly connected to the other side of the connecting plate 574.

[0054] The liquid pipe 58 of the connected block 571 in the collision component 57 is connected to the three-way block 29, and through the communication port in the connected block 571, the box body 52 is connected to the expansion component 24. When the airbag 241 of the expansion component 24 is subjected to the pressure of a heavy object, the liquid with moving impulse impacts the confluence cover 573 by flowing back to the connected block 571 due to the pressure of the heavy object on the airbag 241. The confluence cover 573 acts on the connecting plate 574 when impacted, so that the connecting plate 574 reaches the pulling force to extend the damping telescopic rod 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.

[0055] Refer to Figures 9 to 11 The anti-rotation 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 broken blocks 552 are fixedly connected in an annular array on the upper end surface of the chassis 551. A top plate 553 is fixedly connected to the upper end surfaces of the broken blocks 552 together, and the top plate 553 is fixedly connected to the top of the box body 52.

[0056] Using the chassis 551 and the rotating rod 561 in the anti-rotation component 55, the rotation of the rotating rod 561 is restricted by the broken block 552. The broken block 552 is connected to the top plate 553. Furthermore, only when the rope 563 pulled out by the winding wheel 562 on the rotating rod 561 reaches the force to break the broken block 552 can the rotating rod 561 rotate, and the rope 563 is pulled out from the winding wheel 562 to achieve the purpose of closing the valve 53.

[0057] Refer to Figures 1 to 2 It further includes an oil suction and delivery mechanism 4. The oil suction and delivery 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 connected to an oil delivery pipe 44, and the other end of the oil delivery pipe 44 is connected to the oil input end of the oil cylinder. The input end of the electric control oil 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 output end of the oil cylinder;

[0058] The main port of the electric control oil 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.

[0059] The forward-rotating oil pump 43 in the oil suction and delivery mechanism 4 can deliver the hydraulic oil in the oil storage tank 41 to the output end of the electro-hydraulic control valve 42, and then through the oil delivery pipe 44 to the output end of the oil cylinder, thereby causing the piston to rise. When the oil pump 43 rotates in reverse, the suction force of the oil pump 43 sucks the hydraulic oil in the oil cylinder through the oil suction pipe 45 at the input end of the electro-hydraulic control valve 42, thereby causing the piston to descend.

[0060] The operating principle of this embodiment is specifically as follows:

[0061] First step: First, when the operator needs to use the jack 1 to lift a heavy object, the operator's controller issues an instruction to start the forward rotation of the oil pump 43. Thus, the hydraulic oil in the oil storage tank 41 is sucked into the electro-hydraulic control valve 42 through the oil pump 43. The electro-hydraulic control valve 42 opens the connection between the main port and the output end under the control of the controller, so that the hydraulic oil is delivered to the oil input 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 to the oil cylinder through the electro-hydraulic control 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 electro-hydraulic control 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;

[0062] When the piston needs to descend, the operator issues an instruction through the controller to control the reverse rotation of the oil pump 43. 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. 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.

[0063] It should be noted that the forward and reverse rotation power of the oil pump 43 determines the rising and falling speed of the piston, and the forward and reverse rotation power of the oil pump 43 is customized by the operator in the controller according to the actual use situation.

[0064] Second step: During the process of the jack 1 lifting a heavy object, when the oil cylinder explodes (the main reason for the explosion of the oil cylinder is that long-term work 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, and then tiny cracks appear, resulting in an explosion), the sealing structure in 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. Under the action of the huge pressure, the telescopic box 22 is driven to contract rapidly.

[0065] Among them, in the normal working state (when the oil cylinder does not burst), the telescopic box 22 will synchronously expand and contract with the piston's lifting and lowering in the oil cylinder. The telescopic box 22 is composed of multiple installation boxes and multiple elastic boxes alternating with each other, and this structure enables the telescopic box 22 to have good telescopic performance;

[0066] When the telescopic box 22 extends (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 cutoff mechanism 5 through the communication pipe 232. When the airbag 241 of the expansion component 24 expands under the tensile force during the extension 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 communication pipe 232 under the action of the pressure difference, causing the airbag 241 to expand;

[0067] 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 communication pipe 232.

[0068] Note: At this time, the pressure on the airbag 241 of the expansion component 24 does not reach 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.

[0069] 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 assembly 24 is squeezed by a large pressure. Since the airbag 241 of the expansion assembly 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 assembly 26). This pressure acts on the sliding disk 266 of the release assembly 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 partition 263. Therefore, the pressure in the airbag 241 pushes the sliding disk 266 to overcome the resistance of the partition 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 at this time, the intermittent rod 265 will break accordingly. At this time, the sliding disk 266 loses the clamping of the partition 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 support 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.

[0070] Among them, 1): Examples of the compressed powder and the reaction liquid are given as follows:

[0071] Example 1: The compressed powder is: sodium bicarbonate (NaHCO3);

[0072] The reaction liquid is: dilute sulfuric acid (H2SO4)

[0073] Chemical reaction: When the dilute sulfuric acid solution in the airbag 241 is discharged through the release assembly 26 and contacts the sodium bicarbonate powder in the storage box 28, a chemical reaction will occur: H2SO4 + 2NaHCO3 → Na2SO4 + 2H2O + 2CO2↑; 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 support force for the piston through the connecting block 21 and the connecting rod 211.

[0074] Example 2: The compressed powder is: calcium carbonate (CaCO3);

[0075] The reaction liquid is: dilute hydrochloric acid (HCl);

[0076] Chemical reaction: When a dilute hydrochloric acid solution meets calcium carbonate powder, the following chemical reaction occurs: CaCO3 + 2HCl → CaCl2 + H2O + CO2↑. 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 oil.

[0077] 2): An example of the pressure value of the airbag 241 corresponding to the fracture of the discontinuous rod 265 is given:

[0078] 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 pressure, F is force, S is the force-bearing area), the pressure inside the airbag 241 at this time is 4900÷0.002 = 2450000 Pa, that is, 2.45 MPa. If the discontinuous rod 265 is designed to break at about 2.5 MPa, when the pressure inside the airbag 241 reaches this value, the discontinuous rod 265 breaks and the release assembly 26 starts to work.

[0079] The third step: While the expansion assembly 24 is being squeezed, the reaction liquid in the airbag 241 will first flow back to the connecting block 571 through the liquid pipe 58 due to the pressure. The flowing-back reaction liquid also has a great impact force (because: when the expansion assembly 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 connecting block 571, and the pressure inside the airbag 241 rises sharply under extrusion, according to Pascal's law, the liquid can transmit pressure evenly, which enables the reaction liquid to accumulate a powerful pressure energy in a narrow space. When the cylinder explosion causes the piston to lose support and the heavy object pressure causes the expansion assembly 24 to be quickly squeezed, the reaction liquid instantly obtains a great kinetic energy and rushes towards the connecting 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 connecting 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 connecting plate 574 to move, so that the connecting plate 574 collides with the valve 53 through the semi-circular covers 575 on both sides;

[0080] 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. At this time, the reaction liquid in the airbag 241 of the blocking mechanism 2 will not reach the locking of the open state of the valve 53 by the winding wheel 562, the rope 563 and the retractable rod 54 as the piston rises and falls;

[0081] When the oil cylinder bursts and the connecting 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 pulled out from the winding wheel 562. As the rope 563 is pulled out, the rotating rod 561 is driven to rotate;

[0082] It should be specifically noted that during normal operation, the blocking 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 blocking block 552. However, the force generated when the semi-circular cover 575 collides with the valve 53 breaks the blocking block 552, allowing the rotating rod 561 to rotate and driving the winding wheel 562 to continuously release the rope 563.

[0083] Among them, during the process of the rope 563 being pulled out and the rotating rod 561 rotating, the retractable rod 54 contracts. 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.

[0084] 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 component 24 cannot flow back and can only act on the release component 26 and be discharged from the release component 26 to realize the reaction of the reaction liquid with 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.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; 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 described in the foregoing embodiments, or perform equivalent replacements for 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, Including: A jack (1) and a base (3); A blocking mechanism (2), having at least two of the 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) provided on the outer peripheral surface of the jack (1). The jack (1) is composed of an oil cylinder and a piston. The fixed communication block (23) is fixedly connected to the bottom of the outer peripheral surface of the oil cylinder. One side of the fixed communication block (23) is fixedly communicated with a curved pipe (231), and the upper end surface of the fixed communication block (23) is fixedly communicated with a communication pipe (232). The outer peripheral surface of the oil cylinder between the two blocking mechanisms (2) is fixedly connected with a three-way block (29). Two of the ports of the three-way block (29) are communicated with the other end of the curved pipe (231). 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 connecting block (21). A plurality of sets of storage boxes (28) are linearly arranged on the inner wall of the telescopic box (22). Compressed powder is stored in the storage boxes (28). A plurality of expansion components (24) and a plurality of sets of telescopic rods (27) are alternately arranged on the opposite surfaces of the connecting block (21) and the fixed communication block (23). Each set of the telescopic rods (27) has a plurality of them, and both ends of the telescopic rods (27) are fixedly connected to the opposite surfaces of adjacent two fixed disks (243). An intercommunication pipe (25) is fixedly connected between the adjacent two fixed disks (243), and both ends of the intercommunication pipe (25) penetrate through the fixed disks (243) and are communicated with an airbag (241). A plurality of release components (26) are annularly arranged 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 interior 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); The collision component (57) includes a communication block (571) fixedly connected to one side of the box body (52) facing the jack (1). The communication block (571) penetrates through the box body (52) and extends into the interior of the box body (52) on the side facing the box body (52). The other side of the communication block (571) away from the box body (52) is fixedly communicated with a liquid pipe (58). The other end of the liquid pipe (58) is communicated with the other port of the three-way block (29); The valve (53) is hermetically hinged to the inside of the box body (52). The positioning assembly (56) includes a rotating rod (561) rotatably connected to the inner bottom of the box body (52). At least two I-shaped pulleys (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 I-shaped pulley (562). One end of the rope (563) is fixedly connected to the inner wall of the box body (52) on one side of the connecting 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 box body (52). One side of the box body (52) facing the liquid storage tank (51) is in communication with the liquid storage tank (51) through a pipeline, and a reaction liquid is stored inside the liquid storage tank (51).

2. The oil return structure of a hydraulic jack according to claim 1, characterized in that, The telescopic box (22) is composed of multiple installation boxes and multiple elastic boxes alternating with each other. Each set of packing boxes (28) has four. The packing boxes (28) correspond to the installation boxes and are fixedly connected to the inner walls around the installation boxes. One side of the connecting block (21) facing the piston is fixedly connected with a connecting rod (211), and the connecting rod (211) is fixedly connected to the top of the outer periphery of the piston.

3. The oil return structure of a hydraulic jack according to claim 1, characterized in that, The multiple expansion assemblies (24) include two air bags (241) and a connecting ring (242). The connecting ring (242) is fixedly connected and communicated between the two air bags (241). One side of each air bag (241) away from the connecting ring (242) is fixedly connected with a fixed disk (243). The fixed disk (243) close to the fixed connecting block (23) is fixedly connected to the upper end face of the fixed connecting block (23), and the other end of the connecting pipe (232) penetrates through the fixed disk (243) and is communicated with the corresponding air bag (241). The fixed disk (243) close to the connecting block (21) is fixedly connected to the bottom of the connecting block (21).

4. The oil return structure of a hydraulic jack according to claim 1, characterized in that, The release assembly (26) includes a release pipe (261) fixedly connected and communicated to the outer peripheral surface of the connecting ring (242). A plurality of partitions (263) are fixedly connected to the inner peripheral surface of the release pipe (261) near one end of the fixed disk (243) in a circular array. A sliding disk (266) is jointly contacted on the side of the partitions (263) away from the fixed disk (243), and the sliding disk (266) is hermetically 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). An intermittent rod (265) is fixedly connected to the central position of the opposite surface of the sealing disk (264) and the sliding disk (266). A plurality of release holes (262) are opened in the outer peripheral surface of the release pipe (261) located on the intermittent rod (265) in a circular array.

5. The oil return structure of a hydraulic jack according to claim 1, characterized in that, One side of the connection block (571) located inside the box body (52) is provided with a connection port communicating with the liquid pipe (58). Peripheries of one side of the connection block (571) located inside the box body (52) are fixedly connected with damping telescopic rods (572). The telescopic ends of the damping telescopic rods (572) are fixedly connected with a connection plate (574) together. A flow concentrating cover (573) is fixedly connected to one side of the connection plate (574) facing the connection block (571), and the flow concentrating cover (573) corresponds to the connection port. Two semi-circular covers (575) are symmetrically and fixedly connected to the other side of the connection plate (574).

6. The oil return structure of a hydraulic jack according to claim 1, characterized in that, The rotation prevention assembly (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 a rotating rod (561). A plurality of broken blocks (552) are fixedly connected to the upper end surface of the chassis (551) in an annular array. The upper end surfaces of the broken blocks (552) are fixedly connected with a top plate (553) together, and the top plate (553) is fixedly connected to the top of the box body (52).

7. The oil return structure of a hydraulic jack according to claim 1, characterized in that, It further includes an oil suction and transportation mechanism (4). The oil suction and transportation mechanism (4) includes an oil storage tank (41) fixedly connected to the upper end surface of a base (3). A controller is installed on the side surface 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 an oil delivery end of an 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 an 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 pipe, and the input end of the oil pump (43) is fixedly communicated with the oil storage tank (41) through a pipe.

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