A hydraulic system pipe joint anti-loosening device and installation method

Abstract

A hydraulic system pipe joint anti-loose device and installation method, for the hydraulic pipe with at least two branch pipes, each of which is provided with at least one joint nut, each joint nut is sleeved with an anti-loose washer, a hexagonal hole is formed in the middle of the washer body of the anti-loose washer and matched with the joint nut, the hexagonal hole is limitedly matched with the side wall of the joint nut, so that the joint nut and the anti-loose washer cannot rotate relatively, a plurality of wire locking holes are formed in the anti-loose washer, the anti-loose washers arranged on adjacent branch pipes are connected with each other through steel wires, so that when one joint nut is loosened, the other joint nut is pulled and tightened through the steel wire, and the friction of the joint nut prevents loosening. The design not only can lock two joint nuts, but also can fix the anti-loose washer on the joint nut through the ear plate, avoid the anti-loose washer from falling off, and effectively improve the reliability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of anti-loose devices, especially a kind of hydraulic system pipe joint anti-loose device and installation method, specifically applicable to the hydraulic system pipe joint anti-loose device of multiple rotary mechanisms synchronous operation without pressure fluctuation. BACKGROUND

[0002] The connection of pipeline usually adopts the form of pipe joint and joint nut connection, and the pipe joint and joint nut are usually provided with an outer hexagonal structure for tightening by a wrench tool. This connection method is mature in technology, and has many advantages such as convenient installation and low cost.

[0003] However, during the use of the hydraulic system, the pipe joint and joint nut may still loosen due to various factors such as insufficient pre-tightening force, gasket deformation, vibration, impact, etc., leading to leakage or even serious leakage. This situation directly affects the accuracy of pressure and flow data, and easily causes protection action to result in the inability of the equipment to operate normally.

[0004] The current pipe joint anti-loose measures usually adopt two ways of nut interlocking or thread glue. The nut interlocking is to open a safety hole on the pair of joint nuts, and to connect the two joint nuts into one body by a mechanical structure. Since the rotation directions of the pair of joint nuts are opposite, the two joint nuts cannot rotate relative to each other when connected into one body, thereby preventing the joint nuts from loosening. The thread glue anti-loose is to apply thread glue on the internal thread of the nut while installing with the rated torque, and to connect the joint nut and the pipe joint by the curing of the thread glue in an oxygen-free environment. This scheme can ensure installation and prevent the joint from loosening during use.

[0005] Although these two methods can prevent the loosening of the pipe joint to some extent, they still have the following defects:

[0006] 1. The nut interlocking method has a large size, requires special tools during installation, is complicated to operate, has low efficiency, and is difficult to install and disassemble in a small space, and has poor operation and maintenance.

[0007] 2. In actual use environment, there are often multiple pipelines arranged in parallel. In this case, the gap between the pipelines is often small, and the conventional nut interlocking device interferes with the adjacent pipeline and cannot be used. Even if the gap between the pipelines can accommodate the interlocking device, it is difficult to put in the special tool and cannot be operated.

[0008] 3. The nut interlocking method must require the presence of a pair of joint nuts on the pipeline, and cannot be applied to the case of a single joint nut and cooperation.

[0009] 4. The thread glue application method is difficult to disassemble when disassembling the joint, and the excess thread glue is easy to enter the hydraulic system, causing the deterioration of the hydraulic oil.

[0010] 5. Nut interlocking methods are difficult to disassemble and require special tools, and often cannot be easily disassembled and assembled when used in underwater environments.

[0011] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of existing anti-loosening methods, which are difficult to install and disassemble, and cannot be applied to areas with limited space, resulting in a limited scope of application. This invention provides an anti-loosening device and installation method for hydraulic system pipe joints that is easy to install and disassemble and applicable to areas with limited space.

[0013] To achieve the above objectives, the technical solution of the present invention is:

[0014] A hydraulic system pipe joint anti-loosening device is disclosed. The hydraulic system includes a hydraulic pipeline, anti-loosening gaskets, and steel wires. The hydraulic pipeline has at least two branch pipelines, with an included angle of less than 90 degrees between adjacent branch pipelines. The minimum distance between adjacent branch pipelines is greater than or equal to twice the diameter of the anti-loosening gasket. Each branch pipeline is provided with at least one joint nut. Each joint nut on the hydraulic pipeline is fitted with an anti-loosening gasket. The joint nut and the central axis of the anti-loosening gasket coincide. The anti-loosening gasket includes an integral gasket body, multiple locking holes, and multiple ear plates. The center of the anti-loosening gasket has an internal hexagonal hole that mates with the joint nut in the hydraulic pipeline. Each side of the internal hexagonal hole is provided with an ear plate. Multiple locking holes are evenly distributed along the circumference of the anti-loosening gasket. The diameter of the locking holes is larger than the diameter of the steel wire. Both ends of the steel wire are fixedly connected to the locking holes on an anti-loosening gasket. The anti-loosening gaskets connected to both ends of the steel wire are respectively fitted onto the joint nuts on adjacent branch pipelines.

[0015] An ear plate is fixedly installed at the middle of each side of the internal hexagonal hole. The end of the ear plate is positioned directly opposite the center of the internal hexagonal hole, and the length of the ear plate is greater than half the length of the connector nut.

[0016] A bending groove is provided in the middle of each side of the internal hexagonal hole. One end of the ear plate is fixedly set at the bottom of the bending groove. The length of the ear plate is greater than half the length of the connector nut plus the depth of the bending groove.

[0017] The anti-loosening washer has an even number of locking holes. The locking holes on the anti-loosening washer are arranged in pairs to form a group of wire mounting holes. The distance between the two locking holes in each group of wire mounting holes is greater than the side length of the internal hexagonal hole.

[0018] Each steel wire is cross-wound on the steel wire mounting hole groups at both ends thereof.

[0019] The connecting parts of the two ends of the steel wire are arranged between the two branch pipe lines connected at both ends thereof.

[0020] Each lock wire hole is provided with an arc-shaped chamfer at both ends thereof.

[0021] The lock washer and the steel wire are made of L stainless steel, and the surfaces of the lock washer and the steel wire are sprayed with anticorrosive paint.

[0022] A mounting method of a hydraulic system pipe joint lock device, the mounting method comprises:

[0023] First step: bending the ear plates, the operator bends each ear plate on the lock washer, the bending directions of adjacent ear plates are opposite, when the included angle between each ear plate and the lock washer is less than or equal to ninety degrees, the bending ear plate step is completed, and the second step of locking the joint nut step is entered;

[0024] Second step: locking the joint nut, each lock washer is sleeved on the adjacent two branch pipe lines to be installed, and the joint nut on the branch pipe line is rotated until the joint nut is locked with the corresponding hydraulic pipe, at this time, the locking joint nut step is completed, and the third step of installing the lock washer is entered;

[0025] Third step: installing the lock washer, the lock washer is rotated so that the inner hexagonal hole on the lock washer is opposite to the outer hexagonal of the joint nut, and the steel wire mounting hole group on the lock washer is close to the adjacent branch pipe line, when the inner hexagonal hole on the lock washer and the steel wire mounting hole group are adjusted to the positions, the lock washer is sleeved on the joint nut, and the end portions of each ear plate are bent to be respectively limited by the two ends of the joint nut, at this time, the installing lock washer step is completed, and the fourth step of installing the steel wire is entered;

[0026] Fourth step: installing the steel wire, one end of the steel wire is sequentially inserted into the front side of the first lock wire hole, the rear side of the second lock wire hole, the rear side of the fourth lock wire hole and the front side of the third lock wire hole, and is fixedly connected with the other end of the steel wire, at this time, the lock device is installed.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] 1. In the hydraulic system pipe joint anti-loosening device, for the hydraulic pipe with at least two branch pipes, each of which is provided with at least one joint nut, a locking washer is sleeved on each joint nut, an inner hexagonal hole is formed in the middle of the washer body, the inner hexagonal hole is limitedly matched with the side wall of the joint nut, so that the joint nut and the locking washer cannot rotate relative to each other, and a plurality of wire locking holes are formed on the locking washer, the locking washers arranged on adjacent branch pipes are connected by a steel wire, so that when one of the joint nuts is loosened, the other joint nut is pulled and tightened by the steel wire, and then the friction of the latter joint nut locks the former joint nut. Therefore, the design can lock the two joint nuts arranged on two adjacent branch pipes by the locking washer and the steel wire, so as to prevent the joint nut from loosening.

[0029] 2. In the hydraulic system pipe joint anti-loosening device, a bending groove is formed in the middle of each edge of the inner hexagonal hole, one end of the ear plate is fixedly arranged at the bottom of the bending groove, and the other end of the ear plate is arranged opposite the center of the inner hexagonal hole, so that the side of the ear plate can be flush with the edge of the inner hexagonal hole when the ear plate is bent, avoiding interference with the locking washer sleeved on the joint nut. The length of the ear plate is greater than the sum of half the length of the joint nut and the depth of the bending groove, so that when the locking washer is sleeved on the middle of the joint nut, the length of the end of the ear plate exceeds the front and rear ends of the joint nut after the adjacent ear plates are bent in opposite directions. At this time, the ear plate end can limit the locking washer and the front and rear ends of the joint nut, avoiding the locking washer from falling off the joint nut. Therefore, the design can fix the locking washer on the joint nut by the ear plate, avoid the locking washer from falling off, and effectively improve the reliability of the system.

[0030] 3. In the hydraulic system pipe joint anti-loosening device, an even number of wire locking holes are formed on the locking washer in the circumferential direction, the wire locking holes formed on the locking washer form a steel wire mounting hole group in pairs, the distance between adjacent wire locking holes is greater than the side length of the inner hexagonal hole, and the steel wire is cross-wound on the steel wire mounting hole group at both ends during installation. Since the distance between adjacent wire locking holes is large, the distance between the wire locking hole and the rotation center of the locking washer is larger, a larger torque can be generated when the joint nut is loosened, and the sensitivity of the joint nut interlocking is improved. Therefore, the distance between the wire locking hole and the rotation center of the locking washer in the design is large, effectively improving the sensitivity of the joint nut interlocking.

[0031] 4、The hydraulic system pipe joint anti-loosening device, the anti-loosening washer and the steel wire are made of 316L stainless steel, the surfaces of the anti-loosening washer and the steel wire are sprayed with anticorrosive paint, the system has good corrosion resistance, and can be applied to underwater environment or corrosive gas and liquid.

[0032] 5、The hydraulic system pipe joint anti-loosening device, the anti-loosening washers on adjacent pipes are connected through the steel wire, when disassembled in underwater environment, only the steel wire needs to be cut to quickly disassemble, so that the system can be applied to underwater environment. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of the present application.

[0034] Figure 2 is a structural schematic diagram of another view of the present application.

[0035] Figure 3 is a structural schematic diagram of the first embodiment of the present application.

[0036] Figure 4 is a structural schematic diagram of the second embodiment of the present application.

[0037] Figure 5 is a perspective view of the second embodiment of the present application.

[0038] Figure 6 is Figure 1 a structural schematic diagram of the anti-loosening washer.

[0039] Figure 7 is Figure 1 a structural schematic diagram of the anti-loosening washer in the installed state.

[0040] Figure 8 is Figure 1 a structural schematic diagram of the steel wire.

[0041] In the figure: hydraulic pipeline 1, branch pipeline 11, joint nut 12, anti-loosening washer 2, washer body 21, wire locking hole 22, ear plate 23, inner hexagonal hole 24, steel wire mounting hole group 25, first wire locking hole 26, second wire locking hole 27, third wire locking hole 28, fourth wire locking hole 29, steel wire 3, bending groove 4. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below in combination with the description of the drawings and specific embodiments.

[0043] Referring toFigures 1 to 8 A hydraulic system pipe joint anti-loosening device, the hydraulic system comprises a hydraulic pipeline 1, an anti-loosening gasket 2 and a steel wire 3; the hydraulic pipeline 1 has at least two branch pipelines 11, the included angle between adjacent branch pipelines 11 is less than ninety degrees, the minimum distance between adjacent branch pipelines 11 is greater than or equal to twice the diameter of the anti-loosening gasket 2, at least one joint nut 12 is arranged on each branch pipeline 11, a anti-loosening gasket 2 is sleeved on each joint nut 12 on the hydraulic pipeline 1, the center axis of the joint nut 12 and the anti-loosening gasket 2 coincide, the anti-loosening gasket 2 comprises a gasket body 21, a plurality of lock wire holes 22 and a plurality of ear plates 23, a hexagonal hole 24 is formed in the middle of the anti-loosening gasket 2, which cooperates with the joint nut 12 in the hydraulic pipeline 1, an ear plate 23 is arranged on each side of the hexagonal hole 24, a plurality of lock wire holes 22 are uniformly formed on the anti-loosening gasket 2 in the circumferential direction, the diameter of the lock wire hole 22 is greater than the diameter of the steel wire 3, the two ends of the steel wire 3 are fixedly connected with the lock wire holes 22 on the anti-loosening gasket 2, and the anti-loosening gaskets 2 connected at the two ends of the steel wire 3 are sleeved on the joint nuts 12 arranged on the adjacent branch pipelines.

[0044] An ear plate 23 is fixedly arranged at the middle of each side of the hexagonal hole 24, and the end of the ear plate 23 is arranged opposite to the center of the hexagonal hole 24, and the length of the ear plate 23 is greater than half the length of the joint nut 12.

[0045] A bending groove 4 is formed at the middle of each side of the hexagonal hole 24, one end of the ear plate 23 is fixedly arranged at the bottom of the bending groove 4, and the length of the ear plate 23 is greater than the sum of half the length of the joint nut 12 and the depth of the bending groove 4.

[0046] An even number of lock wire holes 22 are formed on the anti-loosening gasket 2, and the lock wire holes 22 formed on the anti-loosening gasket 2 form a steel wire mounting hole group 25 in pairs, and the distance between the two lock wire holes 22 in each steel wire mounting hole group 25 is greater than the side length of the hexagonal hole 24.

[0047] Each steel wire 3 is cross-wound on the steel wire mounting hole groups 25 at the two ends thereof.

[0048] The connection parts of the two ends of the steel wire 3 are arranged between the two branch pipelines connected at the two ends thereof.

[0049] Arc-shaped chamfers are formed at the two ends of each lock wire hole 22.

[0050] The anti-loosening gasket 2 and the steel wire 3 are made of 316L stainless steel, and the surfaces of the anti-loosening gasket 2 and the steel wire 3 are sprayed with anticorrosive paint.

[0051] A mounting method of a hydraulic system pipe joint anti-loosening device, the mounting method comprises:

[0052] First step: bending ear plate 23, the operator bends each ear plate 23 on the lock washer 2, the bending direction of adjacent ear plate 23 is opposite, when the included angle between each ear plate 23 and the lock washer 2 is less than or equal to ninety degrees, the step of bending ear plate 23 is completed, and the second step of locking joint nut 12 is entered;

[0053] Second step: locking joint nut 12, each lock washer 2 is provided on the adjacent two branch pipes 11 to be installed, and the joint nut 12 on the branch pipe 11 is rotated until the joint nut 12 is locked with the corresponding hydraulic pipe, at this time, the step of locking joint nut 12 is completed, and the third step of installing lock washer 2 is entered;

[0054] Third step: installing lock washer 2, rotating lock washer 2, so that the internal hexagonal hole 24 on the lock washer 2 is opposite to the external hexagonal of the joint nut 12, and the steel wire mounting hole group 25 on the lock washer 2 is close to the adjacent branch pipe 11, when the internal hexagonal hole 24 and the steel wire mounting hole group 25 on the lock washer 2 are adjusted, the lock washer 2 is provided on the joint nut 12, and the end of each ear plate 23 is bent to be limited with the two ends of the joint nut 12, at this time, the step of installing lock washer 2 is completed, and the fourth step of installing steel wire 3 is entered;

[0055] Fourth step: installing steel wire 3, one end of the steel wire 3 is sequentially inserted into the front side of the first locking hole 26, the rear side of the second locking hole 27, the rear side of the fourth locking hole 29 and the front side of the third locking hole 28, and the other end of the steel wire 3 is fixedly connected, at this time, the lock washer installation is completed.

[0056] The principle of the present application is as follows:

[0057] In use, the lock washer 2 at both ends is connected by the cross-wound steel wire 3, for a single lock washer 2, since the steel wire 3 sequentially passes through the two locking holes 22 thereon and is attached to one side, the steel wire 3 does not slide and rub with the lock washer 2 in a taut state, so that when one of the lock washers 2 loosens, the steel wire 3 thereon is taut and pulls the other lock washer 2 to rotate;

[0058] In installation, the two ends of the steel wire 3 are connected by the steel wire rope clamp.

[0059] Example 1:

[0060] The utility model provides a kind of hydraulic system pipe joint anti-loose device, the hydraulic system includes hydraulic pipeline 1, anti-loose washer 2 and steel wire 3;The hydraulic pipeline 1 has at least two branch lines 11, the included angle between adjacent branch lines 11 is less than ninety degrees, the minimum distance between adjacent branch lines 11 is greater than or equal to the diameter of anti-loose washer 2 twice, at least one nipple nut 12 is provided on each branch line 11, each nipple nut 12 on the hydraulic pipeline 1 is sleeved with an anti-loose washer 2, the center axis of the nipple nut 12 and anti-loose washer 2 coincides, the anti-loose washer 2 includes the washer body 21 of integrated structure, multiple lock wire holes 22 and multiple ear plates 23, the middle part of the anti-loose washer 2 is provided with the inner hexagonal hole 24 matched with the nipple nut 12 in the hydraulic pipeline 1, an ear plate 23 is provided on each side of the inner hexagonal hole 24, multiple lock wire holes 22 are evenly provided on the anti-loose washer 2 along the circumferential direction, the diameter of the lock wire hole 22 is greater than the diameter of the steel wire 3, the two ends of the steel wire 3 are fixedly connected with the lock wire hole 22 on an anti-loose washer 2, the anti-loose washer 2 connected at the two ends of the steel wire 3 is sleeved on the nipple nut 12 provided on the adjacent branch line;The middle part of each side of the inner hexagonal hole 24 is fixedly provided with an ear plate 23, the end of the ear plate 23 is opposite to the center of the inner hexagonal hole 24, and the length of the ear plate 23 is greater than half the length of the nipple nut 12;The middle part of each side of the inner hexagonal hole 24 is provided with a bending groove 4, one end of the ear plate 23 is fixedly arranged at the bottom of the bending groove 4, and the length of the ear plate 23 is greater than the sum of half the length of the nipple nut 12 and the depth of the bending groove 4.

[0061] A kind of hydraulic system pipe joint anti-loose device installation method, the installation method includes:

[0062] First step: bending ear plate 23, operator is bent to each ear plate 23 on anti-loose washer 2, the bending direction of adjacent ear plate 23 is opposite, when the included angle of each ear plate 23 and anti-loose washer 2 is less than or equal to ninety degrees, the ear plate 23 is bent step is completed, and second step: locking nipple nut 12 step is entered;

[0063] Second step: locking nipple nut 12, each anti-loose washer 2 is sleeved on the adjacent two branch lines 11 to be installed, and the nipple nut 12 on the branch line 11 is rotated until the nipple nut 12 is locked with corresponding hydraulic pipeline, at this time, the nipple nut 12 is locked step is completed, and third step installation anti-loose washer 2 step is entered;

[0064] Third step: install the anti-loose washer 2, rotate the anti-loose washer 2, so that the inner hexagonal hole 24 on the anti-loose washer 2 is opposite to the outer hexagonal of the joint nut 12, and the steel wire installation hole group 25 on the anti-loose washer 2 is close to the adjacent branch pipe 11, when the inner hexagonal hole 24 and the steel wire installation hole group 25 on the anti-loose washer 2 are adjusted to the right position, the anti-loose washer 2 is sleeved on the joint nut 12, and the end of each ear plate 23 is bent to be limited by the two ends of the joint nut 12, at this time, the installation of the anti-loose washer 2 is completed, and the fourth step of installing the steel wire 3 is entered;

[0065] Fourth step: install the steel wire 3, one end of the steel wire 3 is sequentially inserted into the front side of the first lock wire hole 26, the rear side of the second lock wire hole 27, the rear side of the fourth lock wire hole 29 and the front side of the third lock wire hole 28, and then is fixedly connected with the other end of the steel wire 3, at this time, the installation of the anti-loose device is completed.

[0066] Embodiment 2:

[0067] Embodiment 2 is basically the same as embodiment 1, and the difference lies in that:

[0068] The anti-loose washer 2 is provided with an even number of lock wire holes 22, the lock wire holes 22 provided on the anti-loose washer 2 form a steel wire installation hole group 25 in pairs, the distance between the two lock wire holes 22 in each steel wire installation hole group 25 is greater than the side length of the inner hexagonal hole 24; each steel wire 3 is cross-wound on the steel wire installation hole group 25 at the two ends thereof; and the connection part of the steel wire 3 at the two ends is arranged between the two branch pipes connected at the two ends.

[0069] Embodiment 3:

[0070] Embodiment 3 is basically the same as embodiment 2, and the difference lies in that:

[0071] The two ends of each lock wire hole 22 are provided with arc chamfers; the anti-loose washer 2 and the steel wire 3 are both made of 316L stainless steel, and the surfaces of the anti-loose washer 2 and the steel wire 3 are sprayed with anticorrosive paint.

[0072] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments, but any equivalent modification or change made by the ordinary skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.

Claims

1. A hydraulic system pipe joint anti-loosening device, characterized in that: the hydraulic system comprises a hydraulic pipeline (1), an anti-loosening washer (2) and a steel wire (3); the hydraulic pipeline (1) has at least two branch pipelines (11), the included angle between adjacent branch pipelines (11) is less than ninety degrees, the minimum distance between adjacent branch pipelines (11) is greater than or equal to twice the diameter of the anti-loosening washer (2), at least one joint nut (12) is arranged on each branch pipeline (11), an anti-loosening washer (2) is sleeved on each joint nut (12) on the hydraulic pipeline (1), the center axes of the joint nut (12) and the anti-loosening washer (2) coincide, the anti-loosening washer (2) comprises a washer body (21) of an integral structure, a plurality of wire locking holes (22) and a plurality of ear plates (23), a hexagonal socket (24) matched with the joint nut (12) in the hydraulic pipeline (1) is formed in the middle of the anti-loosening washer (2), an ear plate (23) is arranged on each side of the hexagonal socket (24), the bending directions of adjacent ear plates (23) are opposite, a plurality of wire locking holes (22) are uniformly formed on the anti-loosening washer (2) in the circumferential direction, the diameter of the wire locking hole (22) is greater than the diameter of the steel wire (3), the two ends of the steel wire (3) are fixedly connected with the wire locking holes (22) on the anti-loosening washers (2), and the anti-loosening washers (2) connected at the two ends of the steel wire (3) are sleeved on the joint nuts (12) arranged on the adjacent branch pipelines. An ear plate (23) is fixedly arranged at the middle of each side of the hexagonal socket (24), and the end of the ear plate (23) is arranged opposite the center of the hexagonal socket (24). A bending groove (4) is formed at the middle of each side of the hexagonal socket (24), one end of the ear plate (23) is fixedly arranged at the bottom of the bending groove (4), and the length of the ear plate (23) is greater than half the length of the joint nut (12) plus the depth of the bending groove (4).

2. The hydraulic system pipe joint anti-loosening device according to claim 1, characterized in that: an even number of wire locking holes (22) are formed in the anti-loosening washer (2), the wire locking holes (22) formed in the anti-loosening washer (2) form a steel wire mounting hole group (25) in twos, and the distance between the two wire locking holes (22) in each steel wire mounting hole group (25) is greater than the side length of the hexagonal socket (24).

3. The hydraulic system pipe joint anti-loosening device according to claim 2, characterized in that: each steel wire (3) is cross-wound on the steel wire mounting hole groups (25) at the two ends thereof.

4. The hydraulic system pipe joint anti-loosening device according to claim 3, characterized in that: the connection parts of the two ends of the steel wire (3) are arranged between the two branch pipelines connected at the two ends thereof.

5. The hydraulic system pipe joint anti-loosening device according to claim 4, characterized in that: arc-shaped chamfers are formed at the two ends of each wire locking hole (22).

6. The hydraulic system pipe joint anti-loosening device according to claim 5, characterized in that: The anti-loosening washer (2) and the steel wire (3) are both made of 316L stainless steel, and the surfaces of the anti-loosening washer (2) and the steel wire (3) are sprayed with anticorrosive paint.

7. The installation method of the hydraulic system pipe joint anti-loosening device according to any one of claims 1 to 6, characterized in that: The installation method comprises: Step 1: bending the ear plates (23), the operator bends each ear plate (23) on the anti-loosening washer (2), the bending directions of adjacent ear plates (23) are opposite, when the included angle between each ear plate (23) and the anti-loosening washer (2) is less than or equal to ninety degrees, the bending ear plate (23) step is completed, and the joint nut (12) locking step is entered; Step 2: locking the joint nut (12), each anti-loosening washer (2) is sleeved on the adjacent two branch pipes (11) to be installed, and the joint nut (12) on the branch pipe (11) is rotated until the joint nut (12) is locked with the corresponding hydraulic pipe, at this time the joint nut (12) locking step is completed, and the anti-loosening washer (2) installation step is entered; Step 3: installing the anti-loosening washer (2), rotating the anti-loosening washer (2) so that the inner hexagonal hole (24) on the anti-loosening washer (2) is opposite to the outer hexagonal of the joint nut (12), and the steel wire mounting hole group (25) on the anti-loosening washer (2) is close to the adjacent branch pipe (11), when the inner hexagonal hole (24) and the steel wire mounting hole group (25) on the anti-loosening washer (2) are adjusted to the right position, the anti-loosening washer (2) is sleeved on the joint nut (12), and the end of each ear plate (23) is bent to make the end of each ear plate (23) limit the two ends of the joint nut (12), at this time the anti-loosening washer (2) installation step is completed, and the steel wire (3) installation step is entered; Step 4: installing the steel wire (3), one end of the steel wire (3) is sequentially inserted into the front side of the first locking hole (26), the rear side of the second locking hole (27), the rear side of the fourth locking hole (29) and the front side of the third locking hole (28), and then fixedly connected with the other end of the steel wire (3), at this time the anti-loosening device installation is completed.

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