A fall-preventing hydraulic cylinder and fitting

Abstract

The utility model discloses a kind of hydraulic cylinder and fittings of anti-falling, including cylinder body, piston and piston rod, the inner cavity of cylinder body is separated into front cavity and rear cavity by piston, front cavity and rear cavity are equipped with an oil inlet and outlet respectively, piston and piston rod transmission connection, still include the flow restrictor of conical frustum, it is equipped with at least one flow-restricting hole that penetrates two platform surface;At least one oil inlet and outlet is set in the pipeline of flow restrictor, and the small size platform surface of flow restrictor is outward;When hydraulic oil is filled into cylinder body from oil inlet and outlet and flows through flow restrictor, hydraulic oil will open flow restrictor, and hydraulic oil mainly passes from the side of flow restrictor;When hydraulic oil is discharged from cylinder body from oil inlet and outlet and flows through flow restrictor, hydraulic oil pushes flow restrictor against the inner wall of pipeline, and hydraulic oil all flows out from flow-restricting hole.The utility model ingeniously limits flow by fixed size flow-restricting hole to stabilize the pressure of hydraulic cylinder, to avoid the applied equipment from falling.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a fall-proof hydraulic cylinder and its accessories. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides.

[0003] A hydraulic cylinder generally includes a cylinder body, piston, piston rod, and seals. The piston divides the cylinder body's interior into two parts: a front chamber and a rear chamber. Each chamber has an oil port connected to an oil pipe for the entry and exit of hydraulic oil. The piston rod is connected to the piston drive. Because the compressibility of the fluid is very low, when oil enters through one oil port, the piston is pushed, causing oil to exit through the other port, thus driving the piston rod to extend or retract, and vice versa.

[0004] Hydraulic cylinders are widely used in various construction machinery such as excavators, loaders, and aerial work platforms. However, during operation, unpredictable factors often cause excessive return hydraulic pressure, leading to the rupture and bursting of connected oil pipes. This results in rapid changes in internal pressure within the hydraulic cylinder, potentially causing safety issues such as boom failure and collapse. While flow-limiting components such as throttle valves are available on the market, their complex structure and numerous parts make them prone to damage and frequent replacements. Utility Model Content

[0005] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a fall-prevention hydraulic cylinder and accessories. Its structure is simple, and it cleverly uses a flow-limiting orifice of fixed size to limit the flow of hydraulic oil to stabilize the pressure of the hydraulic cylinder, thereby preventing the equipment used from malfunctioning and falling.

[0006] The objective of this utility model is achieved through the following technical solution: a fall-prevention hydraulic cylinder includes a cylinder body, a piston, and a piston rod. The inner cavity of the cylinder body is divided into a front cavity and a rear cavity by the piston. The front cavity and the rear cavity are respectively provided with an oil inlet and an oil outlet. The piston and the piston rod are connected in a driving manner. The cylinder also includes a frustum-shaped flow-limiting plug, which has at least one flow-limiting hole penetrating through the two frustums. The flow-limiting plug is installed in at least one pipe where the oil inlet and outlet are located, and the smaller frustum of the flow-limiting plug faces outward. When hydraulic oil is filled into the cylinder body from the oil inlet and outlet and flows through the flow-limiting plug, the hydraulic oil pushes the flow-limiting plug open, and the hydraulic oil mainly passes through the side of the flow-limiting plug. When hydraulic oil is discharged from the cylinder body from the oil inlet and outlet and flows through the flow-limiting plug, the hydraulic oil pushes the flow-limiting plug against the inner wall of the pipe, and all the hydraulic oil flows out from the flow-limiting hole.

[0007] Furthermore, it also includes an O-ring, which is fitted onto the side of the flow restrictor and elastically abuts against the inner wall of the pipe.

[0008] Furthermore, it also includes a front filter and a rear filter disposed within the pipe, the front filter being disposed before the small-sized platform of the flow restrictor and the rear filter being disposed after the large-sized platform of the flow restrictor.

[0009] Specifically, the diameter of the flow-limiting orifice is 0.01~150mm, and / or the total cross-sectional area of ​​the flow-limiting orifice is 0.01~150mm.

[0010] Preferably, the diameter of the flow-limiting orifice is 0.01~0.1mm, 0.1~1mm, 1~10mm, 10~20mm, 20~50mm, 50~100mm or 100~150mm.

[0011] Preferably, the total cross-sectional area of ​​the flow-limiting orifice is 0.01~0.1mm, 0.1~1mm, 1~10mm, 10~20mm, 20~50mm, 50~100mm or 100~150mm.

[0012] Specifically, the inner wall of the pipe where the oil inlet and outlet are located has a stepped structure or a flared structure, so that the pipe forms a local pipe section with a narrower inner diameter from the oil inlet and outlet outwards, and the flow restrictor is correspondingly installed in the local pipe section.

[0013] Furthermore, when the inlet / outlet port is connected to the connecting pipe body to form a hydraulic oil inlet / outlet pipeline, the flow restrictor is disposed at the connection between the inlet / outlet port and the connecting pipe body; or, when the inlet / outlet port and the inlet / outlet nozzle are integrally formed to form a hydraulic oil inlet / outlet pipeline, the flow restrictor is disposed at the exposed end of the inlet / outlet nozzle.

[0014] Specifically, when the flow restrictor is installed at the connection between the oil inlet / outlet and the connecting pipe, the oil inlet / outlet is a stepped through-hole, which is divided into a small straight through-hole, a flared hole, and a large straight through-hole from the inside of the cylinder to the surface of the cylinder. The flared hole gradually expands from the inside of the cylinder to the surface of the cylinder. The connecting pipe has a stepped through-pipe structure, which includes flared sections at both ends and a straight through-pipe section in the middle. The flared sections at both ends expand towards the pipe opening. When the oil inlet / outlet and the connecting pipe are connected to each other, the flared holes of the oil inlet / outlet and the flared sections of the connecting pipe are spliced ​​together with a large surface, forming a local pipe section with a narrower inner diameter from the oil inlet / outlet outward at the connection. The flow restrictor is installed in the local pipe section.

[0015] Another technical solution provided by this utility model to solve the above-mentioned technical problems: an accessory for a fall-prevention hydraulic cylinder, including a frustum-shaped flow-limiting plug, which has at least one flow-limiting hole penetrating two surfaces; the flow-limiting plug is used to be installed in the pipeline where at least one oil inlet and outlet of the hydraulic cylinder is located, and the smaller surface of the flow-limiting plug faces outward; when hydraulic oil is filled into the cylinder body from the oil inlet and outlet and flows through the flow-limiting plug, the hydraulic oil pushes the flow-limiting plug open, and the hydraulic oil mainly passes through the side of the flow-limiting plug; when hydraulic oil is discharged from the cylinder body from the oil inlet and outlet and flows through the flow-limiting plug, the hydraulic oil pushes the flow-limiting plug against the inner wall of the pipeline, and all the hydraulic oil flows out from the flow-limiting hole.

[0016] Furthermore, it also includes an O-ring, a front filter, and a rear filter. The O-ring is fitted onto the side of the flow restrictor to elastically abut against the inner wall of the pipe. The front filter is positioned before the small-sized platform of the flow restrictor, and the rear filter is positioned after the large-sized platform of the flow restrictor.

[0017] Specifically, the diameter of the flow-limiting orifice is 0.01~150mm, and / or the total cross-sectional area of ​​the flow-limiting orifice is 0.01~150mm.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. This utility model reduces the risk of equipment failure and fall by incorporating anti-fall accessories. The flow-limiting plug has a simple structure, eliminating complex parts, and cleverly limits the flow through a fixed-size flow-limiting orifice to stabilize the pressure of the hydraulic cylinder.

[0020] 2. The flow limiting plug of this utility model has one or more flow limiting holes, and the diameter of the flow limiting holes is 0.01~150mm, which can well meet the actual needs of different products.

[0021] 3. The O-ring of this utility model effectively improves the sealing performance of the flow restrictor and reduces the machining accuracy requirements of the flow restrictor.

[0022] 4. This utility model features a front filter and a rear filter, effectively preventing impurities from entering the cylinder and clogging the flow-limiting orifice of the flow-limiting plug. Simultaneously, the front and rear filters limit the movement of the flow-limiting plug, ensuring its range of motion. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of the fall protection accessory in Example 1.

[0024] Figure 2 This is a schematic diagram of the structure of Example 1.

[0025] Figure 3 This is a longitudinal sectional view of Example 1.

[0026] Figure 4 for Figure 3 A magnified view of part A.

[0027] Figure 5 This is an enlarged exploded view of a partial cross-section of Example 1.

[0028] Figure 6 This is an enlarged exploded view of a partial cross-section of Example 2.

[0029] In the picture:

[0030] 10-Cylinder block, 11-Front chamber, 12-Rear chamber, 13-Inlet / outlet oil port, 131-First through hole, 133-Bell hole, 135-Second through hole, 15-Connecting pipe body, 152-Bell section, 154-Through pipe section, 16-Inlet / outlet oil nozzle;

[0031] 20-Piston;

[0032] 30 - Piston rod;

[0033] 41-Flow restrictor, 410-Flow restrictor hole, 43-O-ring, 45-Front filter and 47-Rear filter;

[0034] 50-sleeve. Detailed Implementation

[0035] To facilitate understanding of this utility model, the technical solutions and advantages of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Any mechanisms or methods not elaborated in this utility model can be referred to in the prior art. The specific structures and features of this utility model are illustrated below by way of example and should not constitute any limitation on this utility model. Furthermore, any technical feature mentioned below (including implicit or disclosed features), as well as any technical feature directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form more other embodiments that may not be directly or indirectly mentioned in this utility model. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0036] Example 1

[0037] like Figure 1-5 As shown, the anti-fall hydraulic cylinder of this embodiment 1 includes a cylinder body 10, a piston 20, a piston rod 30, and anti-fall accessories. The hydraulic cylinder of this embodiment 1 is a single-cylinder hydraulic cylinder.

[0038] The cylinder body 10 is a cylindrical sealed container, its inner cavity divided into a front chamber 11 and a rear chamber 12 by the piston 20. Each of the front and rear chambers 11 and 12 has an oil inlet / outlet port 13. Each inlet / outlet port 13 has an independent connecting pipe 15, which is inserted into and protrudes from the inlet / outlet port 13 to connect to an oil pipe for hydraulic oil inflow / outflow. The piston 20 and piston rod 30 are connected by a transmission mechanism. By filling one inlet / outlet port 13 with hydraulic oil, the piston 20 moves towards the other inlet / outlet port 13, forcing oil to exit from the other port 13, thereby causing the piston rod 30 to extend or retract, and vice versa.

[0039] Specifically, in this embodiment 1, the oil inlet / outlet port 13 is a stepped through-hole, which is divided into three sections from the inside of the cylinder 10 to the surface of the cylinder 10: a small-sized first straight through-hole 131, a flared hole 133, and a large-sized second straight through-hole 135. The flared hole 133 gradually expands from the inside of the cylinder 10 to the surface of the cylinder 10. The stepped through-hole structure of the oil inlet / outlet port 13 is used to connect to the connecting pipe 15. The connecting pipe 15 is a stepped through-pipe structure, which includes flared sections 152 at both ends and a straight through-pipe section 154 in the middle. The flared sections 152 at both ends expand towards the pipe opening direction. When the oil inlet / outlet 13 is connected to the connecting pipe body 15, the flared hole 133 of the oil inlet / outlet 13 and the flared section 152 of the connecting pipe body 15 are spliced ​​together with a large-size surface, forming a local pipe section with a narrowing inner diameter from the oil inlet / outlet 13 outwards at the connection point. The anti-fall accessory is set at the connection point between the oil inlet / outlet 13 and the connecting pipe body 15. Specifically, the anti-fall accessory is set in this local pipe section with a narrowing inner diameter from the oil inlet / outlet 13 outwards.

[0040] The anti-fall accessories include a flow restrictor 41, an O-ring 43, a front filter 45, and a rear filter 47. This embodiment 1 has two sets of anti-fall accessories, each corresponding to one of the two oil inlet / outlet ports 13.

[0041] The flow restrictor 41 is frustoconical in shape, having two circular platforms of different sizes and a fan-shaped side. The flow restrictor 41 has a flow restricting hole 410 penetrating both platforms, with a diameter of 0.1 mm. The flow restrictor 41 is installed at the connection between the hydraulic cylinder's inlet / outlet port 13 and the connecting pipe body 15. Specifically, the flow restrictor 41 is located in a local pipe section that narrows in inner diameter from the inlet / outlet port 13 outwards, and the side of the flow restrictor 41 corresponds to the inner side of the flared section 152 of the connecting pipe body 15. When hydraulic oil enters the cylinder 10 through the inlet / outlet port 13 and flows through the flow restrictor 41, the hydraulic oil pushes the flow restrictor 41 open, and the hydraulic oil mainly passes through the side of the flow restrictor 41; when hydraulic oil exits the cylinder 10 through the inlet / outlet port 13 and flows through the flow restrictor 41, the hydraulic oil pushes the flow restrictor 41 against the inner wall of the connecting pipe 15, and all the hydraulic oil flows out from the flow restrictor hole 410 of the flow restrictor 41.

[0042] O-ring 43 is fitted onto the side of flow restrictor 41 and elastically abuts against the inner wall of the connecting pipe 15. O-ring 43 effectively improves the sealing performance of flow restrictor 41 and reduces the machining precision requirements of flow restrictor 41.

[0043] The pre-filter 45 is positioned before the small-sized platform of the flow restrictor 41. The end of the flow restrictor 41 with the small-sized platform faces the connecting pipe 15, meaning that the end with the small-sized platform of the flow restrictor 41 faces outwards. Positioning the pre-filter 45 before the small-sized platform of the flow restrictor 41 ensures that the hydraulic oil entering the cylinder 10 from the oil pipe is first filtered by the pre-filter 45 before flowing through the flow restrictor 41 into the cylinder 10. This prevents hydraulic oil containing impurities from entering the cylinder 10 and damaging the hydraulic cylinder, and also prevents impurities from clogging the flow restrictor orifice 410 of the flow restrictor 41. The pre-filter 45 is positioned at any flared section 152 of the connecting pipe 15 for easy replacement.

[0044] In this preferred embodiment, the pre-filter 45 is disposed at the flared end 152 of the connecting pipe 15 near the flow restrictor 41, which is closer to the flow restrictor 41, thus preventing impurities from the inner wall of the connecting pipe 15 itself from entering the flow restrictor hole 410 of the flow restrictor 41.

[0045] The rear filter 47 is positioned behind the large platform of the flow restrictor 41. Since the end of the flow restrictor 41 with its large platform faces the inner cavity of the cylinder 10, the rear filter 47, positioned behind this large platform, ensures that the hydraulic oil flowing from the cylinder 10 into the oil pipe is first filtered by the rear filter 47 before flowing through the flow restrictor 41 into the oil pipe. This prevents impurities from clogging the flow restrictor orifice 410 of the flow restrictor 41, thus preventing the flow restrictor 41 from malfunctioning. Preferably, in this embodiment, the rear filter 47 is positioned at the junction of the first through hole 131 and the flared hole 133 of the oil inlet / outlet 13.

[0046] The flow restrictor 41 is always positioned between the front filter 45 and the rear filter 47 due to the limiting effect of the front filter 45 and the rear filter 47.

[0047] In this embodiment, when hydraulic oil is injected into the cylinder 10 through the inlet / outlet port 13, it first passes through the front filter 45 for filtration, and then flows through the flow-limiting plug 41 into the cylinder 10. The hydraulic oil flowing towards the flow-limiting plug 41 pushes it open, causing it to move closer to the rear filter 47, creating a gap between the flow-limiting plug 41 and the inlet / outlet port 13. The hydraulic oil mainly passes through the side of the flow-limiting plug 41. When hydraulic oil is discharged from the cylinder 10 through the inlet / outlet port 13, it first passes through the rear filter 47 for filtration, and then flows through the flow-limiting plug 41 into the oil pipe. Because the flow restrictor 41 is larger at one end and smaller at the other, the hydraulic oil pushes the flow restrictor 41 closer to the filter screen 45. The flow restrictor 41 elastically abuts against the flared section 152 of the connecting pipe body 15 through the O-ring 43, so that there is zero gap between the flow restrictor 41 and the inlet / outlet port 13. The hydraulic oil can only flow out from the flow restrictor hole 410 of the flow restrictor 41. The number and size of the flow restrictor hole 410 limit the flow rate of the oil.

[0048] After repeated use, the front filter may accumulate a lot of impurities and can be replaced with a simple operation. Specifically, remove the connecting pipe 15, take out the front filter 45 located at the flared end of the connecting pipe 15, replace it with a brand new front filter 45, and then reassemble the connecting pipe 15 to the oil inlet / outlet 13. In addition to being placed using a snap-fit ​​mechanism, the front and rear filters can also be fixed using threaded connections or clips.

[0049] Compared to existing technologies, the anti-fall hydraulic cylinder of this embodiment reduces the risk of equipment failure and fall by incorporating anti-fall accessories. The flow-limiting plug has a simple structure, eliminating complex parts, and cleverly limits the flow through a fixed-size flow-limiting orifice to stabilize the pressure of the hydraulic cylinder.

[0050] In Embodiment 1 above, the anti-fall device is installed at both oil inlet and outlet ports. In other embodiments, the anti-fall device can be installed at either oil inlet or outlet port.

[0051] In Embodiment 1 above, there is one flow-limiting orifice with a diameter of 0.1 mm. In other embodiments, even if the total cross-sectional area of ​​the flow-limiting orifices is also 0.1 mm, there can be two or more flow-limiting orifices. When the diameter of the flow-limiting orifice is designed to be 0.05 mm, the number of flow-limiting orifices can be increased to two; when the diameter of the flow-limiting orifice is designed to be 0.01 mm, the number of flow-limiting orifices can be increased to 10.

[0052] Depending on the working requirements of the hydraulic cylinder, the diameter of the flow-limiting orifice is 0.01~150mm, and the total cross-sectional area of ​​the flow-limiting orifice is 0.01~150mm. Preferably, the diameter of the flow-limiting orifice is 0.01~0.1mm, 0.1~1mm, 1~10mm, 10~20mm, 20~50mm, 50~100mm, or 100~150mm; and the total cross-sectional area of ​​the flow-limiting orifice is 0.01~0.1mm, 0.1~1mm, 1~10mm, 10~20mm, 20~50mm, 50~100mm, or 100~150mm.

[0053] In Embodiment 1 above, the flow restrictor is located at the junction of the inlet / outlet and the connecting pipe, and the inner diameter of this junction narrows outward from the inlet / outlet, so that the inner wall of the pipe where the inlet / outlet is located matches the frustoconical flow restrictor. In other embodiments, the inner wall of the pipe where the inlet / outlet is located has a stepped or flared structure, so that the pipe forms a local section with a narrowing inner diameter from the inlet / outlet outward to match the connecting flow restrictor.

[0054] Example 2

[0055] like Figure 6As shown, the structure of this embodiment 2 is basically the same as that of the embodiment 1, except that: in embodiment 2, the oil inlet / outlet port 13 and the oil inlet / outlet nozzle 16 are integrally formed, and the oil inlet / outlet nozzle 16 protrudes from the surface of the cylinder body 10 to connect with the oil inlet / outlet pipe. The oil inlet / outlet port 13 and the oil inlet / outlet nozzle 16 together form the pipe where the oil inlet / outlet is located, and the anti-fall accessory of embodiment 2 is correspondingly set inside the oil inlet / outlet nozzle 16. Specifically, embodiment 2 also provides a sleeve 50, which is sleeved on the oil inlet / outlet nozzle 16, and the anti-fall accessory is set at the connection between the oil inlet / outlet nozzle 16 and the sleeve 50. The sleeve 50 is welded or snapped to the exposed end of the oil inlet / outlet nozzle 16.

[0056] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A fall-prevention hydraulic cylinder, comprising a cylinder body, a piston, and a piston rod, wherein the inner cavity of the cylinder body is divided into a front cavity and a rear cavity by the piston, and the front cavity and the rear cavity are respectively provided with an oil inlet and an oil outlet, and the piston and the piston rod are kinetically connected, characterized in that, It also includes a frustum-shaped flow restrictor with at least one flow restricting hole penetrating both surfaces; the flow restrictor is installed in at least one of the pipes containing the inlet and outlet ports, with the smaller surface of the flow restrictor facing outwards; when hydraulic oil enters the cylinder from the inlet and outlet ports and flows through the flow restrictor, the hydraulic oil pushes the flow restrictor open, and the hydraulic oil mainly passes through the side of the flow restrictor; when hydraulic oil exits the cylinder from the inlet and outlet ports and flows through the flow restrictor, the hydraulic oil pushes the flow restrictor against the inner wall of the pipe, and all the hydraulic oil flows out from the flow restricting hole.

2. The anti-fall hydraulic cylinder as described in claim 1, characterized in that, It also includes an O-ring, which is fitted onto the side of the flow restrictor and elastically abuts against the inner wall of the pipe.

3. The anti-fall hydraulic cylinder as described in claim 1, characterized in that, It also includes a front filter and a rear filter installed in the pipe, with the front filter installed before the small-sized platform of the flow restrictor and the rear filter installed after the large-sized platform of the flow restrictor.

4. The anti-fall hydraulic cylinder as described in claim 1, characterized in that, The diameter of the flow-limiting orifice is 0.01~150mm, and / or the total cross-sectional area of ​​the flow-limiting orifice is 0.01~150mm.

5. The anti-fall hydraulic cylinder as described in claim 4, characterized in that, The diameter of the flow-limiting orifice is 0.01~0.1mm, 0.1~1mm, 1~10mm, 10~20mm, 20~50mm, 50~100mm or 100~150mm; the total cross-sectional area of ​​the flow-limiting orifice is 0.01~0.1mm, 0.1~1mm, 1~10mm, 10~20mm, 20~50mm, 50~100mm or 100~150mm.

6. The anti-fall hydraulic cylinder as described in claim 1, characterized in that, The inner wall of the pipe where the oil inlet and outlet are located has a stepped structure or a flared structure, so that the pipe forms a local pipe section with a narrower inner diameter from the oil inlet and outlet outward, and the flow restrictor is correspondingly installed in the local pipe section.

7. The anti-fall hydraulic cylinder as described in claim 6, characterized in that, When the inlet / outlet port is connected to the connecting pipe body to form a hydraulic oil inlet / outlet pipeline, the flow restrictor is disposed at the connection between the inlet / outlet port and the connecting pipe body; or, when the inlet / outlet port and the inlet / outlet nozzle are integrally formed to form a hydraulic oil inlet / outlet pipeline, the flow restrictor is disposed at the exposed end of the inlet / outlet nozzle.

8. The anti-fall hydraulic cylinder as described in claim 7, characterized in that, When the flow restrictor is installed at the connection between the oil inlet / outlet and the connecting pipe, the oil inlet / outlet is a stepped through-hole, which is divided into a small straight through-hole, a flared hole, and a large straight through-hole from the inside of the cylinder to the surface of the cylinder. The flared hole gradually expands from the inside of the cylinder to the surface of the cylinder. The connecting pipe has a stepped through-pipe structure, which includes flared sections at both ends and a straight through-pipe section in the middle. The flared sections at both ends expand towards the pipe opening. When the oil inlet / outlet and the connecting pipe are connected to each other, the flared holes of the oil inlet / outlet and the flared sections of the connecting pipe are spliced ​​together with a large surface, forming a local pipe section with a narrower inner diameter from the oil inlet / outlet outward at the connection. The flow restrictor is installed in the local pipe section.

9. An accessory for a fall-prevention hydraulic cylinder, characterized in that, The device includes a frustum-shaped flow restrictor with at least one flow restricting hole penetrating both surfaces. The flow restrictor is installed in a pipe containing at least one inlet / outlet of the hydraulic cylinder, with the smaller surface of the flow restrictor facing outwards. When hydraulic oil enters the cylinder from the inlet / outlet and flows through the flow restrictor, the hydraulic oil pushes the flow restrictor open, and the hydraulic oil mainly passes through the side of the flow restrictor. When hydraulic oil exits the cylinder from the inlet / outlet and flows through the flow restrictor, the hydraulic oil pushes the flow restrictor against the inner wall of the pipe, and all the hydraulic oil flows out from the flow restricting hole.

10. The accessory for the anti-fall hydraulic cylinder as described in claim 9, characterized in that, It also includes an O-ring, a front filter, and a rear filter. The O-ring is fitted onto the side of the flow restrictor to elastically abut against the inner wall of the pipe. The front filter is positioned before the small-sized platform of the flow restrictor, and the rear filter is positioned after the large-sized platform of the flow restrictor. The diameter of the flow restrictor orifice is 0.01~150mm, and / or the total cross-sectional area of ​​the flow restrictor orifice is 0.01~150mm.

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