Hydraulic oil cylinder with axial supporting protection function

Abstract

The invention discloses a hydraulic oil cylinder with an axial supporting protection function, and belongs to the technical field of hydraulic cylinders, the hydraulic oil cylinder comprises an outer cylinder body, an oil cylinder rod and a first piston, a center oil cavity is formed in the outer cylinder body, the first piston is fixedly connected to the bottom of the oil cylinder rod, and the oil cylinder rod and the first piston are both slidably connected to the interior of the center oil cavity; a pressure buffering structure is connected into the outer cylinder body, when the oil cylinder rod bears pressure, the pressure buffering structure and the magnetic supporting structure are matched with each other to jointly share the pressure borne by the oil cylinder rod, a supporting rod in the magnetic supporting structure can transmit the pressure of the oil cylinder rod to a second piston, and therefore the oil cylinder rod is prevented from falling off. The second piston slides downwards in the storage cavity and extrudes the magnetorheological fluid, the stress of the oil cylinder rod is relieved through the buffering characteristic of the magnetorheological fluid, and therefore protection on the oil cylinder rod is effectively enhanced, and the stability and reliability of the hydraulic oil cylinder under the pressure effect are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and in particular, to a hydraulic cylinder with axial support protection. Background Art

[0002] In the field of hydraulic transmission and control, as a core actuator, the reliability and durability of hydraulic cylinders directly affect the operating efficiency of the entire system. With the continuous improvement of industrial automation, hydraulic cylinders are increasingly widely used in high-load and high-dynamic working conditions such as construction machinery, metallurgical equipment, and aerospace. The problems of axial instability and structural fatigue exposed by traditional hydraulic cylinders under extreme working conditions have become increasingly prominent, becoming the key bottleneck restricting the improvement of system performance.

[0003] In the patent with the title: A Hydraulic Cylinder with Axial Support Protection, and the publication number: CN116717521B, it is proposed that the force borne by an existing single hydraulic cylinder is limited. If the critical value is reached, there will be a risk of cylinder explosion. Therefore, it is necessary to increase the number of hydraulic cylinders for distributed support of the force, but the cost is relatively high and it is more cumbersome. Through the design of the cylinder body in the main structure, during the oil supply, the force rod can be assisted to lift by means of the oil, thereby strengthening the protection of the telescopic rod against the shared force. And through the arrangement of the first fastening frame and the second fastening frame in the protection structure, it is convenient for disassembly and installation, and can protect the overall force of the hydraulic cylinder, and the shared force is evenly and stably distributed. However, when the hydraulic cylinder shares the pressure, an external hinged connecting rod is used to form a triangular support to share and buffer the overall pressure. However, during use, it is easy to loosen under long-term vibration and high load conditions, and frequent inspections and maintenance are required. Moreover, the assembly process of the protection structure and the force-dispersing structure components is cumbersome. Therefore, a hydraulic cylinder with axial support protection is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic cylinder with axial support protection to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A hydraulic cylinder with axial support protection, including an outer cylinder body, a cylinder rod, and a first piston. A central oil cavity is opened inside the outer cylinder body. The first piston is fixedly connected to the bottom of the cylinder rod. Both the cylinder rod and the first piston are slidably connected inside the central oil cavity. A pressure-relieving structure is connected inside the outer cylinder body. The pressure relief structure includes a plurality of storage cavities opened inside the outer cylinder body. The inside of the storage cavity is filled with magnetorheological fluid. A magnetic force support structure is connected inside the storage cavity. The upper end of the magnetic force support structure is connected to the outer periphery of the top end of the oil cylinder rod. The magnetic force support structure is used to change the viscosity of the magnetorheological fluid by generating a magnetic field, and support the oil cylinder rod with pressure relief through the magnetorheological fluid whose viscosity has changed. A mutual backup structure is connected between the storage cavity and the central oil cavity; The mutual backup structure is used to connect the central oil cavity and the storage cavity, and mutually transport the oil fluid and the magnetorheological fluid to form mutual backup support.

[0006] Preferably, the magnetic force support structure includes a plurality of second pistons sliding inside a plurality of storage cavities. A support rod is fixedly connected to the second piston. The top of the support rod is fixedly connected to a connection bracket. The connection bracket is fixedly connected to the outer periphery of the top of the oil cylinder rod. A vertical coil is connected inside the second piston. A conductive block is connected inside the central oil cavity. The conductive block is connected to an external power supply through a wire. A conductive contact is installed outside the first piston. The conductive contact is electrically connected to the vertical coil.

[0007] Preferably, the mutual backup structure includes a placement cavity opened at the bottom of the outer cylinder body. The inner top wall of the placement cavity is fixedly connected with a multi-way electric control valve. The outlet end of the multi-way electric control valve is connected to the central oil cavity. The inlet end of the multi-way electric control valve is connected with a plurality of first delivery pipes. The outlet ends of the plurality of first delivery pipes are respectively connected to a plurality of storage cavities.

[0008] Preferably, the mutual backup structure further includes a delivery electric control valve. The delivery electric control valve is fixedly connected to the inner top wall of the placement cavity. The outlet end of the delivery electric control valve is connected to the central oil cavity. The outlet end of the delivery electric control valve is communicated with a second delivery pipe. The end of the second delivery pipe far away from the delivery electric control valve is connected to the storage cavity.

[0009] Preferably, the mutual backup structure further includes a first isolation elastic capsule and a second isolation elastic capsule. The second isolation elastic capsule is fixedly connected to the inside of the central oil cavity. The second isolation elastic capsule divides the inside of the central oil cavity into an upper oil inlet chamber and a lower standby chamber. The liquid outlet of the multi-way electric control valve is connected to the standby chamber. The first isolation elastic capsule is fixedly connected to the inside of the storage cavity. The first isolation elastic capsule divides the inside of the storage cavity into an upper storage chamber and a lower storage chamber. The outlet end of the second delivery pipe is connected to the lower storage chamber. The inlet end of the delivery electric control valve is communicated with a shunt hose. The end of the shunt hose far away from the delivery electric control valve penetrates the outer wall of the second isolation elastic capsule and is connected to the upper oil inlet chamber.

[0010] Preferably, a fourth delivery pipe is externally connected to one of the storage cavities, communication cavities are provided between multiple storage cavities, and the multiple storage cavities are interconnected through the communication cavities. A third delivery pipe is externally connected to the upper oil inlet chamber.

[0011] Preferably, a diamond grid is integrally formed on the outer surfaces of the first piston and the second piston, and a spiral coil is integrally formed on the inner wall of the central oil cavity. The spiral coil is electrically connected to an external wire.

[0012] Preferably, a threaded connection section is threadedly connected inside the placement cavity, and a shielding cover is fixedly connected to the outside of the threaded connection section.

[0013] Preferably, a support column is fixedly connected below the second piston, multiple stepped plates are fixedly connected to the outside of the support column, and multiple circulation holes are provided in the outside of the stepped plates.

[0014] Preferably, a piezoelectric ceramic is installed at the central positions of the first isolation elastic sac and the second isolation elastic sac.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, when the oil cylinder rod bears pressure, the pressure relief structure and the magnetic force support structure cooperate with each other to jointly share the pressure received by the oil cylinder rod. In the magnetic force support structure, the support rod will transfer the pressure of the oil cylinder rod to the second piston. The second piston slides downward in the storage cavity and squeezes the magnetorheological fluid, and the buffering characteristics of the magnetorheological fluid are used to reduce the force on the oil cylinder rod, thereby effectively enhancing the protection of the oil cylinder rod and improving the stability and reliability of the hydraulic cylinder under pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is an exploded structural diagram of an embodiment of the present invention; Figure 3 is a schematic structural diagram of the placement cavity in an embodiment of the present invention; Figure 4 is a schematic cross-sectional structural diagram of the outer cylinder body in an embodiment of the present invention; Figure 5 is an embodiment of the present invention Figure 4 The enlarged structural diagram of area A in; Figure 6 is a schematic cross-sectional structural diagram of the second piston in an embodiment of the present invention; Figure 7 is a schematic structural diagram of the diamond grid outside the second piston in an embodiment of the present invention; Figure 8 is a schematic structural diagram of the piezoelectric ceramic and the first isolation elastic sac in an embodiment of the present invention.

[0017] In the figure: 100, outer cylinder body; 101, oil cylinder rod; 102, first piston; 103, storage cavity; 104, support rod; 105, second piston; 106, communication cavity; 107, vertical coil; 108, conductive block; 109, conductive contact; 110, connection bracket; 200, placement cavity; 201, multi-way electrically controlled valve; 202, first delivery pipe; 203, delivery electrically controlled valve; 204, second delivery pipe; 300, first isolation elastic sac; 301, second isolation elastic sac; 302, shunt hose; 400, spiral coil; 500, shielding cover; 501, threaded connection section; 600, stepped plate; 601, circulation hole; 602, support column; 700, piezoelectric ceramic; 800, third delivery pipe; 801, fourth delivery pipe. Specific implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1. As Figure 1 shown, a hydraulic cylinder with axial support protection in this application includes an outer cylinder body 100, an oil cylinder rod 101, and a first piston 102. A central oil cavity is opened inside the outer cylinder body 100. The first piston 102 is fixedly connected to the bottom of the oil cylinder rod 101. Both the oil cylinder rod 101 and the first piston 102 are slidably connected inside the central oil cavity. A pressure relief structure is connected inside the outer cylinder body 100; The pressure relief structure includes a plurality of storage cavities 103 opened inside the outer cylinder body 100. The storage cavities 103 are filled with magnetorheological fluid. A magnetic force support structure is connected inside the storage cavities 103. The upper end of the magnetic force support structure is connected to the outer periphery of the top end of the oil cylinder rod 101. The magnetic force support structure is used to change the viscosity of the magnetorheological fluid by generating a magnetic field, and the magnetorheological fluid with changed viscosity is used to relieve pressure and support the oil cylinder rod 101. A mutual backup structure is connected between the storage cavity 103 and the central oil cavity; The mutual backup structure is used to connect the central oil cavity and the storage cavity 103 to communicate with each other, and mutually transport the oil fluid and the magnetorheological fluid to form mutual backup support.

[0020] Specifically, during the use process, hydraulic oil is injected into the central oil cavity of the outer cylinder body 100. Under continuous hydraulic injection, the first piston 102 and the oil cylinder rod 101 can be pushed to move inside the central oil cavity, and the overall pushing effect is realized. The process of injecting hydraulic oil is to inject it into the central oil cavity through the third delivery pipe 800.

[0021] As Figure 2 shown, during the compression of the oil cylinder rod 101, the pressure received by the oil cylinder rod 101 can be shared through a pressure relief structure and a magnetic force support structure. The magnetic force support structure includes a plurality of second pistons 105 sliding inside a plurality of storage chambers 103. A support rod 104 is fixedly connected to the second piston 105. The top of the support rod 104 is fixedly connected to a connection bracket 110. The connection bracket 110 is fixedly connected to the outer periphery of the top of the oil cylinder rod 101. A vertical coil 107 is connected inside the second piston 105, and a conductive block 108 is connected inside the central oil chamber. The conductive block 108 is connected to an external power supply through a wire.

[0022] Specifically, in the magnetic force support structure, when the oil cylinder rod 101 is under pressure, the pressure will be dispersed to a plurality of support rods 104 located outside the oil cylinder rod 101. After the support rod 104 is under pressure, it will transmit the pressure to the second piston 105 and drive the second piston 105 to slide downward inside the storage chamber 103. When the second piston 105 slides downward, it will squeeze the magnetorheological fluid located inside the storage chamber 103, and buffer the storage chamber 103 and the second piston 105 through the magnetorheological fluid, so as to further share the pressure received by the oil cylinder rod 101.

[0023] Furthermore, when the oil cylinder rod 101 is under excessive pressure, the conductive block 108 can be energized through an external wire. When the conductive block 108 is energized, the current can be transmitted to the conductive contact 109 through the conductive block 108. After the current is transmitted into the conductive contact 109, the current can be transmitted into the vertical coil 107. The vertical coil 107 will generate a certain magnetic field when it contacts the current. When the magnetic field is generated, the viscosity of the magnetorheological fluid will change, so as to generate a higher damping force to further buffer the pressure received by the support rod 104 and the second piston 105.

[0024] Specifically, a plurality of pressure sensors are installed inside the outer cylinder block 100. When the rapid movement of the first piston 102 and the second piston 105 triggers the displacement or pressure sensor to monitor the signal in real time, if it is detected that the acceleration exceeds the set threshold or the pressure difference gradient is abnormal ΔP>2 MPa, a dynamic current is immediately output to the vertical coil 107 embedded in the cylinder block through an external controller, and the current intensity is: 0 - 5 A. After the current is activated, a high-intensity magnetic field of 1.0 - 1.5 T is generated in the gap between the first piston 102, the second piston 105 and the central oil chamber and the storage chamber 103, so that the ferromagnetic particles in the magnetorheological fluid instantaneously form a chain-like network structure along the magnetic induction lines, and the liquid viscosity increases sharply from 0.1 Pa·s to 50 Pa·s, showing a solid-like hardening characteristic. The hardened magnetorheological fluid will generate a controllable damping force of up to 8000 N under the moving shear force of the second piston 105, realizing the precise absorption of vibration energy and quickly adjusting the stability of the cylinder block.

[0025] As Figures 4 - 7 shown, a diamond grid is integrally formed on the outer surfaces of the first piston 102 and the second piston 105, and a spiral coil 400 is integrally formed on the inner wall of the central oil chamber. The spiral coil 400 is electrically connected to an external wire.

[0026] Specifically, during the movement of the first piston 102 and the second piston 105, they intersect with the magnetorheological fluid, and multiple synergistic effects are realized through their periodic geometric structures. The geometric acute angles induce local shear stress concentration, and the energy consumption efficiency of the solidified liquid under the action of the magnetic field is increased by 20%; the asymmetric flow channel forces the liquid flow to generate micron-scale vortices, combined with the dynamic disturbance of the alternating magnetic field, reducing the phenomenon of sedimentation of the magnetorheological fluid. The diamond grid is a diamond unit with a side length of 200 μm and an inclination angle of 30°.

[0027] Furthermore, the setting of the spiral coil 400 can form an axial magnetic field between the first piston 102 and the outer cylinder block 100, directly controlling the nucleation of the chain structure of the magnetorheological fluid and the yield stress of 0 - 50 kPa, realizing the linear adjustment of the damping force from 500 N to 8000 N. At the same time, when a 1 A high-frequency alternating current of 10 kHz is superimposed, the skin effect of the spiral coil 400 suppresses the hysteresis loss, shortens the magnetic field response time from 50 ms to 10 ms, and at the same time reduces the temperature rise ΔT<15 °C.

[0028] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages: When the cylinder rod 101 bears pressure, the pressure relief structure and the magnetic support structure cooperate with each other to jointly share the pressure received by the cylinder rod 101. In the magnetic support structure, the support rod 104 will transmit the pressure of the cylinder rod 101 to the second piston 105. The second piston 105 slides downward in the storage cavity 103 and squeezes the magnetorheological fluid, and uses the buffering characteristics of the magnetorheological fluid to reduce the force on the cylinder rod 101, thereby effectively enhancing the protection of the cylinder rod 101 and improving the stability and reliability of the hydraulic cylinder under pressure.

[0029] Embodiment 2. Considering that during the use process, in the case of high load, the hydraulic cylinder may fail due to fatigue accumulation. For example, during the use of a stamping machine tool, when the main system has a long-term high load and the instantaneous pressure is between 70 MPa and 210 MPa, the main cylinder will collapse. Once the collapse occurs, most of the stamping machine tools in operation can only be shut down, and once shut down, it may cause damage to the workpiece. To solve the above technical problems, the present application proposes a mutual backup structure to solve the above technical problems: As Figures 3 - 5 shown, the mutual backup structure includes a placement cavity 200 opened at the bottom of the outer cylinder body 100. The inner top wall of the placement cavity 200 is fixedly connected with a multi-way electric control valve 201. The outlet end of the multi-way electric control valve 201 is communicated with the central oil cavity. The inlet end of the multi-way electric control valve 201 is connected with a plurality of first delivery pipes 202. The outlet ends of the plurality of first delivery pipes 202 are respectively communicated with a plurality of storage cavities 103; The mutual backup structure further includes a delivery electric control valve 203. The delivery electric control valve 203 is fixedly connected to the inner top wall of the placement cavity 200. The outlet end of the delivery electric control valve 203 is communicated with the central oil cavity. The outlet end of the delivery electric control valve 203 is communicated with a second delivery pipe 204. The end of the second delivery pipe 204 away from the delivery electric control valve 203 is communicated with the storage cavity 103.

[0030] Specifically, in the mutual backup structure, when the overall working condition of the hydraulic cylinder is detected to have excessive pressure, the multi-way electrically controlled valve 201 is activated by the controller. When the multi-way electrically controlled valve 201 is activated, the magnetorheological fluid inside the storage chamber 103 can be transported through the first delivery pipe 202 into the inner part of the central oil chamber. And when the magnetorheological fluid is transported through the first delivery pipe 202 into the inner part of the central oil chamber, the vertical coil 107 inside the first piston 102 and the spiral coil 400 inside the central oil chamber can also be activated. When the vertical coil 107 and the spiral coil 400 are activated, the viscosity of the magnetorheological fluid entering the inner part of the central oil chamber can be changed, and through the hardening of the magnetorheological fluid, further support is formed for the cylinder rod 101 and the first piston 102, achieving rapid switching as a whole, buffering and supporting the oil cylinder, and reducing the sudden mechanical shutdown phenomenon caused by the collapse of the oil cylinder.

[0031] Furthermore, during the support process of the oil cylinder, if the magnetorheological fluid inside the storage chamber 103 cannot generate effective support due to power shortage, the oil fluid inside the central oil chamber can be transported into the inner part of the second delivery pipe 204 by opening the delivery electrically controlled valve 203 and cooperating with the shunt hose 302. When the oil fluid is transported into the inner part of the second delivery pipe 204, the second delivery pipe 204 can transport the oil fluid into the inner parts of each storage chamber 103, thereby replenishing the inside of the storage chamber 103 through the replenishment of the oil fluid, and supporting the support rod 104 and the second piston 105 through the oil fluid for the second time. As a whole, it is realized that the oil fluid and the magnetorheological fluid inside the central oil chamber can form a mutual supply and backup situation, reducing the phenomena of the collapse and lack of support of the hydraulic cylinder.

[0032] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: For Embodiment 1, in this embodiment, through the two-way flow control of the magnetorheological fluid and the hydraulic oil and the design of electrically controlled redundant support, the medium can be quickly switched in high-load scenarios, the viscosity of the magnetorheological fluid is regulated by the magnetic field to form a quasi-solid support layer, and the medium loss is compensated by combining the oil fluid reverse replenishment mechanism, significantly enhancing the anti-fatigue property and the ultimate pressure-bearing capacity of the cylinder body. At the same time, through the closed-loop self-replenishment and modular maintenance, the shutdown caused by the system collapse is effectively avoided.

[0033] Embodiment 3: In the mutual backup structure, when the magnetorheological fluid and the hydraulic oil flow into the storage chamber 103 and the central oil chamber respectively, it is necessary to separate the magnetorheological fluid and the oil fluid. And once the separation is not carried out, the phenomenon of the magnetorheological fluid contaminating the oil fluid will occur. In view of the above technical problems, the present application also proposes the following technical solutions in the mutual backup structure to solve the above technical problems. Specifically: Such as Figures 4 - 5As shown in the figure, the mutual backup structure further includes a first isolation elastic bladder 300 and a second isolation elastic bladder 301. The second isolation elastic bladder 301 is fixedly connected to the inside of the central oil chamber. The second isolation elastic bladder 301 divides the inside of the central oil chamber into an upper oil inlet chamber and a lower standby chamber. The liquid outlet of the multi-electronic control valve 201 is communicated with the standby chamber. The first isolation elastic bladder 300 is fixedly connected to the inside of the storage chamber 103. The first isolation elastic bladder 300 divides the inside of the storage chamber 103 into an upper storage chamber 103 and a lower storage chamber 103. The outlet end of the second delivery pipe 204 is connected to the lower storage chamber 103. The inlet end of the delivery electronic control valve 203 is communicated with a shunt hose 302. One end of the shunt hose 302 away from the delivery electronic control valve 203 penetrates the outer wall of the second isolation elastic bladder 301 and is communicated with the upper oil inlet chamber.

[0034] Specifically, in the mutual backup structure, during the mutual transmission process of the oil fluid and the magnetorheological fluid, the space inside the central oil chamber and the storage chamber 103 is divided by the second isolation elastic bladder 301 and the first isolation elastic bladder 300. In the case of dividing the internal space, the oil fluid inside the central oil chamber is transported to the inside of the lower storage chamber 103 separated by the first isolation elastic bladder 300 through the shunt hose 302, the delivery electronic control valve 203 and the second delivery pipe 204. The lower storage chamber 103 is used to store the continuously incoming hydraulic oil, and in the case of continuously incoming hydraulic oil, the first isolation elastic bladder 300 can be expanded and deformed, thereby squeezing the magnetorheological fluid above. The magnetorheological fluid forms a secondary support for the support rod 104 and the second piston 105 under the condition of being squeezed and deformed by the magnetic field.

[0035] Furthermore, after the multi-electronic control valve 201 is opened, the oil fluid located inside the storage chamber 103 will be centrally transported to the inside of the multi-electronic control valve 201 through the first delivery pipe 202, and centrally transported to the inside of the lower standby chamber in the central oil chamber through the multi-electronic control valve 201. After the magnetorheological fluid is centrally transported to the inside of the lower standby chamber, the increase in the magnetorheological fluid will also cause the second isolation elastic bladder 301 to expand and deform. In the case of the second isolation elastic bladder 301 expanding and deforming, more magnetorheological fluid can be stored inside the lower standby chamber. After the magnetorheological fluid gradually enters the inside of the lower standby chamber, by starting the vertical coil 107 inside the first piston 102 and the spiral coil 400 inside the central oil chamber, in the case of the vertical coil 107 and the spiral coil 400 being started, the viscosity of the magnetorheological fluid entering the inside of the central oil chamber can be changed, and further support for the oil cylinder rod 101 and the first piston 102 can be formed through the hardening of the magnetorheological fluid.

[0036] As Figures 1 - 3 shown in the figure, a threaded connection section 501 is threadedly connected to the inside of the placement chamber 200, and a shielding cover 500 is fixedly connected to the outside of the threaded connection section 501.

[0037] Specifically, the shielding cover 500 and the placement cavity 200 can be threadedly connected through the threaded connection section 501, so that a connection is formed between the shielding cover 500 and the placement cavity 200 to protect the multi-electronic control valve 201 and the conveying electronic control valve 203 inside the placement cavity 200.

[0038] Such as Figures 1 - 2 As shown, a fourth conveying pipe 801 is externally connected to one of the storage cavities 103, communication cavities 106 are provided between multiple storage cavities 103, and the multiple storage cavities 103 are interconnected through the communication cavities 106, and a third conveying pipe 800 is externally connected to the upper oil inlet chamber.

[0039] Specifically, the magnetorheological fluid inside the storage cavity 103 is supplemented and recovered through the fourth conveying pipe 801, and in the case of supplementing the magnetorheological fluid, the magnetorheological fluid is evenly conveyed into multiple storage cavities 103 through the communication cavity 106, while the hydraulic oil inside the central oil cavity is conveyed and returned through the third conveying pipe 800.

[0040] Specifically, the first isolation elastic sac 300 and the second isolation elastic sac 301 are made of high-elastic wear-resistant elastic fluororubber material.

[0041] The technical solution in the above embodiment of the present application has at least the following technical effects or advantages: Compared with Embodiment 2, in this embodiment, by adopting the first isolation elastic sac 300 and the second isolation elastic sac 301, the magnetorheological fluid and the hydraulic oil are physically isolated, and zero cross-contamination is achieved throughout the life cycle during two-way flow, ensuring the stable performance of the magnetorheological fluid. Under the expansion and deformation of the elastic sac, the hydraulic oil supply pressure is converted into the compression driving force of the magnetorheological fluid, and an equivalent support strength is formed under the activation of the magnetic field, improving the support effect.

[0042] Embodiment 4. Considering the problem that when the oil cylinder is in a stagnant state for a long time in the case of using magnetorheological fluid, the magnetorheological fluid located inside the storage cavity 103 will settle. Once the magnetorheological fluid settles, the accumulation of magnetic particles at the bottom will greatly weaken its phase change ability after being energized, and sufficient support cannot be provided. To solve the above technical problems, the present application proposes the following technical solution: Such as Figure 8 As shown, a piezoelectric ceramic 700 is installed at the central position of the first isolation elastic sac 300 and the second isolation elastic sac 301.

[0043] Specifically, during use, the piezoelectric ceramic 700 can be energized. When the piezoelectric ceramic 700 is energized, elastic waves will be generated. The certain vibrations generated by the elastic waves can cooperate with the vibrations of the first isolation elastic capsule 300 and the second isolation elastic capsule 301 to suppress the problem of sedimentation of the magnetorheological fluid. By periodically turning on the piezoelectric ceramic 700, the problem that the magnetorheological fluid will not sediment during long-term use can be solved.

[0044] As Figure 6 - Figure 7 As shown, a support column 602 is fixedly connected below the second piston 105. A plurality of stepped plates 600 are fixedly connected to the outside of the support column 602, and a plurality of circulation holes 601 are formed in the outside of the stepped plates 600.

[0045] Specifically, through the arrangement of the stepped plates 600 and the circulation holes 601, when the second piston 105 moves upward or downward, the magnetorheological fluid will pass through the inside of the circulation holes 601. The magnetorheological fluid passing through the inside of the circulation holes 601 will form a vortex under the diversion and movement of the circulation holes 601. The fluidity of the magnetorheological fluid can be increased under the continuous formation of the vortex, thereby reducing the phenomenon of sedimentation of the magnetorheological fluid.

[0046] The technical solutions in the embodiments of the present application described above have at least the following technical effects or advantages: Compared with Embodiment 3, in this embodiment, the piezoelectric ceramic 700 is used to excite the capsule to generate micro-vibrations under high-frequency pulses, so that the magnetic particles of the magnetorheological fluid are continuously in the state of Brownian motion, reducing sedimentation and ensuring the uniformity of particle distribution. When the second piston 105 moves, the multi-stage Venturi effect formed by the stepped plates 600 and the circulation holes 601 induces local eddies in the magnetorheological fluid, breaking the particle deposition structure. At the same time, the sedimentation phenomenon is further reduced by the periodic forward and reverse movement.

[0047] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder with axial support protection, comprising an outer cylinder body, a cylinder rod and a first piston. A central oil cavity is formed inside the outer cylinder body. The first piston is fixedly connected to the bottom of the cylinder rod. Both the cylinder rod and the first piston are slidably connected inside the central oil cavity. It is characterized in that: A pressure relief structure is connected inside the outer cylinder body; The pressure relief structure includes a plurality of storage cavities formed inside the outer cylinder body. The inside of the storage cavity is filled with magnetorheological fluid. A magnetic force support structure is connected inside the storage cavity. The upper end of the magnetic force support structure is connected to the outer periphery of the top end of the oil cylinder rod. The magnetic force support structure is used to generate a magnetic field to change the viscosity of the magnetorheological fluid. The magnetorheological fluid with changed viscosity is used to provide pressure relief support for the oil cylinder rod. A mutual backup structure is connected between the storage cavity and the central oil cavity; The mutual backup structure is used to connect the central oil cavity and the storage cavity, and mutually transport the oil fluid and the magnetorheological fluid to form mutual backup support.

2. The hydraulic cylinder with axial support protection according to claim 1, characterized in that: The magnetic force support structure includes a plurality of second pistons sliding inside a plurality of storage cavities. A support rod is fixedly connected to the second piston. The top of the support rod is fixedly connected with a connection bracket. The connection bracket is fixedly connected to the outer periphery of the top of the oil cylinder rod. A vertical coil is connected inside the second piston. A conductive block is connected inside the central oil cavity. The conductive block is connected to an external power supply through a wire. A conductive contact is installed outside the first piston. The conductive contact is electrically connected to the vertical coil.

3. A hydraulic cylinder with axial support protection according to claim 2, characterized in that: The mutual backup structure includes a placement cavity formed at the bottom of the outer cylinder body. A multi-way electric control valve is fixedly connected to the inner top wall of the placement cavity. The outlet end of the multi-way electric control valve is connected to the central oil cavity. The inlet end of the multi-way electric control valve is connected with a plurality of first delivery pipes. The outlet ends of the plurality of first delivery pipes are respectively connected to a plurality of storage cavities.

4. A hydraulic cylinder with axial support protection according to claim 3, characterized in that: The mutual backup structure further includes a delivery electric control valve. The delivery electric control valve is fixedly connected to the inner top wall of the placement cavity. The outlet end of the delivery electric control valve is connected to the central oil cavity. The outlet end of the delivery electric control valve is communicated with a second delivery pipe. The end of the second delivery pipe far from the delivery electric control valve is connected to the storage cavity.

5. A hydraulic cylinder with axial support protection according to claim 4, characterized in that: The mutual backup structure further includes a first isolation elastic sac and a second isolation elastic sac. The second isolation elastic sac is fixedly connected inside the central oil cavity. The second isolation elastic sac divides the interior of the central oil cavity into an upper oil inlet chamber and a lower standby chamber. The liquid outlet of the multi-way electric control valve is connected to the standby chamber. The first isolation elastic sac is fixedly connected inside the storage cavity. The first isolation elastic sac divides the interior of the storage cavity into an upper storage cavity and a lower storage cavity. The outlet end of the second delivery pipe is connected to the lower storage cavity. The inlet end of the delivery electric control valve is communicated with a shunt hose. The end of the shunt hose far from the delivery electric control valve penetrates the outer wall of the second isolation elastic sac and is connected to the upper oil inlet chamber.

6. A hydraulic cylinder with axial support protection according to claim 1, wherein: A fourth delivery pipe is communicated with the outside of one of the storage cavities. Communication cavities are formed between a plurality of the storage cavities. The plurality of storage cavities are mutually communicated through the communication cavities. A third delivery pipe is communicated with the outside of the upper oil inlet chamber.

7. A hydraulic cylinder with axial support protection according to claim 1, characterized in that: The outer surfaces of the first piston and the second piston are integrally formed with diamond-shaped meshes. The inner wall of the central oil cavity is integrally formed with a spiral coil. The spiral coil is electrically connected to an external wire.

8. A hydraulic cylinder with axial support protection according to claim 5, characterized in that: A threaded connection section is threadedly connected inside the placement cavity. A shielding cover is fixedly connected to the outside of the threaded connection section.

9. A hydraulic cylinder with axial support protection according to claim 2, characterized in that: A support column is fixedly connected below the second piston. A plurality of stepped plates are fixedly connected to the outside of the support column, and a plurality of circulation holes are formed in the outside of the stepped plates.

10. A hydraulic cylinder with axial support protection according to claim 5, characterized in that: Piezoelectric ceramics are installed at the central positions of the first isolation elastic capsule and the second isolation elastic capsule.

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