Falling protection device for hydraulic pipeline

Abstract

The utility model discloses a fall-off protection device for a hydraulic pipeline, the hydraulic pipeline comprises a first liquid pipe, a second liquid pipe and a pipe joint, the first liquid pipe and the second liquid pipe are connected through the pipe joint, and the fall-off protection device comprises a first connecting piece, a second connecting piece and a connecting cable, at least one of the first liquid pipe and the pipe connector is connected with the first connecting piece, the second connecting piece is connected with the second liquid pipe, and the first connecting piece and the second connecting piece are connected through a connecting cable. According to the falling-off protection device, when the first liquid pipe and the second liquid pipe fall off, the swing amplitude of the first liquid pipe or the second liquid pipe can be reduced, and therefore potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pipeline protection devices, in particular to a fall-off protection device for hydraulic pipelines. Background Art

[0002] When the hydraulic support of the fully mechanized mining face is raised or lowered, some hydraulic hoses will be raised or lowered accordingly, generating tension on the hydraulic hoses, which may cause the joints of the hydraulic hoses to loosen or even fall off. Due to the high oil pressure in the hydraulic pipeline, when the hydraulic hose falls off, the hydraulic oil will spray out at high speed to form a strong impact force, causing the hydraulic pipe to swing greatly, posing a threat to the personal safety of the workers and posing a major safety hazard. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the utility model provides a fall-off protection device for a hydraulic pipeline, which can reduce the swing amplitude of the first liquid pipe or the second liquid pipe when the first liquid pipe and the second liquid pipe fall off, thereby reducing safety hazards.

[0005] The embodiment of the utility model is a fall-off protection device for a hydraulic pipeline, wherein the hydraulic pipeline includes a first liquid pipe, a second liquid pipe and a pipe joint, the first liquid pipe and the second liquid pipe are connected by the pipe joint, and the fall-off protection device includes a first connecting piece, a second connecting piece and a connecting rope, at least one of the first liquid pipe and the pipe joint is connected to the first connecting piece, the second connecting piece is connected to the second liquid pipe, and the first connecting piece and the second connecting piece are connected by the connecting rope.

[0006] In some embodiments, the first connecting member is a first clamping member, which is clamped on the pipe joint; and / or the second connecting member is a second clamping member, which is clamped on the second liquid pipe.

[0007] In some embodiments, the first clamping member includes a first plate and a second plate, the first plate and the second plate are arranged opposite to each other on both sides of the pipe joint, the first plate and the second plate are connected by a bolt assembly, and at least one of the first plate and the second plate is connected to the connecting cable.

[0008] In some embodiments, the first clamping member further includes a connecting clip, at least one of the first plate and the second plate is connected to the connecting clip, the connecting clip has an annular connecting groove, and the connecting rope is passed through the connecting groove.

[0009] In some embodiments, the number of the second liquid pipes is two, the second clamping members correspond to the second liquid pipes one by one, the connecting rope is passed through the connecting groove, and the two ends of the connecting rope are respectively connected to the two second clamping members.

[0010] In some embodiments, the fall-off protection device also includes a blocking piece and a linkage assembly, wherein the blocking piece can be movably provided on the second liquid pipe so that the second liquid pipe can be switched between a blocked state and an open state; the second liquid pipe is connected to the pipe joint through the linkage assembly so as to drive the blocking piece to move and switch the second liquid pipe to a blocked state when the second liquid pipe is relatively far away from the pipe joint.

[0011] In some embodiments, the blocking member is disposed in the second liquid pipe and is rotatably connected to the second liquid pipe. The linkage assembly includes a first linkage and a second linkage. The first linkage and the second linkage are transmission-connected. The first linkage is connected to the blocking member, and the second linkage is connected to the pipe joint to drive the blocking member to rotate when the second liquid pipe is relatively far away from the pipe joint.

[0012] In some embodiments, the blocking member is connected to the second liquid pipe via a rotating shaft, the first connecting member is a gear, the second connecting member is a rack, the gear is meshed with the rack, and the rack is sleeved on the rotating shaft and rotates synchronously.

[0013] In some embodiments, the pipe joint has a clearance groove, and when the gear is engaged with the rack, the gear is arranged in the clearance groove, the clearance groove extends along the axial direction of the second liquid pipe, and the clearance groove is open in a direction away from the first liquid pipe.

[0014] In some embodiments, the fall-off protection device also includes a locking assembly, which includes a locking piece and an elastic piece. The locking piece is arranged on a side of the first liquid pipe close to the gear, and the locking piece is slidably connected to the first liquid pipe. The elastic piece is used to apply an elastic force toward the gear to the locking piece, and the gear has a locking groove for cooperating with the locking piece; in the blocking state, the locking piece is inserted into the locking groove.

[0015] The fall-off protection device for hydraulic pipelines in the embodiment of the utility model has a connection rope that acts as a traction device between the first liquid pipe and the second liquid pipe when the second liquid pipe and the first liquid pipe fall off, thereby preventing the first liquid pipe or the second liquid pipe from being suddenly thrown out and reducing the swing amplitude of the first liquid pipe or the second liquid pipe, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of a fall protection device according to an embodiment of the utility model.

[0017] Figure 2 It is a partial structural schematic diagram of a fall protection device according to an embodiment of the utility model.

[0018] Figure 3 It is a structural schematic diagram of a first liquid pipe of a fall protection device in an embodiment of the utility model in an open state.

[0019] Figure 4 The utility model is a schematic diagram of the structure of the linkage assembly of the fall protection device of one embodiment.

[0020] Figure 5 It is a structural schematic diagram of a first liquid pipe of a fall-off protection device in an embodiment of the utility model in a blocked state.

[0021] Figure 6 yes Figure 5 A magnified schematic diagram of center A.

[0022] Reference numerals:

[0023] 100. Fall-off protection device;

[0024] 1. first clamping member; 11. first plate; 12. second plate; 13. connecting clamp; 131. connecting groove; 132. U-shaped rod; 133. pressing plate; 134. nut;

[0025] 2. Second clamping member; 21. First clamping plate; 22. Second clamping plate;

[0026] 3. Connecting rope;

[0027] 4. Blocking member; 41. Rotating shaft;

[0028] 5. linkage assembly; 51. gear; 511. locking groove; 52. rack;

[0029] 6. Locking assembly; 61. Locking member; 62. Elastic member;

[0030] 201, first liquid pipe; 202, second liquid pipe; 2021, connecting portion; 2022, hose portion; 2023, mounting groove; 203, pipe joint; 2031, clearance groove. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0032] like Figure 1As shown, a fall protection device 100 for a hydraulic pipeline in an embodiment of the utility model, wherein the hydraulic pipeline includes a first liquid pipe 201, a second liquid pipe 202 and a pipe joint 203, the first liquid pipe 201 and the second liquid pipe 202 are connected through the pipe joint 203, the fall protection device 100 includes a first connecting member, a second connecting member and a connecting rope 3, at least one of the first liquid pipe 201 and the pipe joint 203 is connected to the first connecting member, the second connecting member is connected to the second liquid pipe 202, and the first connecting member and the second connecting member are connected through the connecting rope 3.

[0033] In the fall-off protection device 100 for hydraulic pipelines of the embodiment of the utility model, when the second liquid pipe 202 and the first liquid pipe 201 fall off, the connecting rope 3 plays a traction role between the first liquid pipe 201 and the second liquid pipe 202 to prevent the first liquid pipe 201 or the second liquid pipe 202 from being suddenly thrown out, and at the same time reduce the swing amplitude of the first liquid pipe 201 or the second liquid pipe 202, thereby reducing safety hazards.

[0034] As an example, Figure 1 As shown, the first liquid pipe 201 is a hard pipe, the first liquid pipe 201 is fixedly installed, the second liquid pipe 202 is a soft pipe, the first liquid pipe 201 and the second liquid pipe 202 are connected by a pipe joint 203, the pipe joint 203 is cylindrical, one end of the pipe joint 203 is fixedly connected to the first liquid pipe 201 by welding or the like, and the other end of the pipe joint 203 is connected to the second liquid pipe 202 by a U-shaped pin, and the U-shaped pin is plugged into the pipe joint 203.

[0035] The second liquid pipe 202 includes a connecting portion 2021 made of metal and a hose portion 2022 made of synthetic rubber. The connecting portion 2021 and the hose portion 2022 are fixedly connected, and one end of the connecting portion 2021 is inserted into the pipe joint 203. In other words, the second liquid pipe 202 is connected to the pipe joint 203 through its connecting portion 2021.

[0036] During the lifting process of the hydraulic support, one end of the second liquid pipe 202 is driven to move. When the connection between the second liquid pipe 202 and the pipe joint 203 loosens and falls off, the end of the second liquid pipe 202 connected to the pipe joint 203 will be suddenly thrown out and swing greatly, posing a threat to the personal safety of the staff.

[0037] Optionally, the second connecting member is connected to the second liquid pipe 202 , and the first connecting member is connected to the pipe joint 203 . In other words, the second liquid pipe 202 is connected to the pipe joint 203 via the connecting cable 3 .

[0038] Therefore, when the second liquid pipe 202 is detached from the pipe joint 203, the connecting rope 3 can pull one end of the second liquid pipe 202, thereby preventing the second liquid pipe 202 from being suddenly thrown out, while reducing the swing amplitude of the second liquid pipe 202 and reducing safety hazards.

[0039] Of course, the first connecting member may also be connected to the first liquid pipe 201 .

[0040] Optionally, the connecting rope 3 is a steel wire rope.

[0041] The steel wire rope has high strength and rigidity and can bear a large load, so that when the second liquid pipe 202 falls off relative to the first liquid pipe 201 , it can provide a better traction effect for the second liquid pipe 202 and reduce the swing amplitude of the second liquid pipe 202 .

[0042] In some embodiments, the first connecting member is a first clamping member 1 , which is clamped on the pipe joint 203 ; and / or the second connecting member is a second clamping member 2 , which is clamped on the second liquid pipe 202 .

[0043] The first connecting member and the second connecting member are clamped on the pipe joint 203 and the second liquid pipe 202 respectively by clamping, which is simpler to operate than welding, bolt connection and other methods.

[0044] In some embodiments, Figure 1 As shown, the first clamping member 1 includes a first plate 11 and a second plate 12, which are arranged on both sides of the pipe joint 203 relatively, and the first plate 11 and the second plate 12 are connected by a bolt assembly, and at least one of the first plate 11 and the second plate 12 is connected to the connecting cable 3.

[0045] By respectively arranging the first plate 11 and the second plate 12 on both sides of the pipe joint 203, and then connecting the first plate 11 and the second plate 12 to each other through a bolt assembly, the first plate 11 and the second plate 12 are tightly stopped on the first liquid pipe 201 from opposite sides, thereby realizing the connection between the first clamp 1 and the first liquid pipe 201.

[0046] It can be understood that when the first clamping member 1 is connected to the first liquid pipe 201 , the first plate 11 and the second plate 12 are clamped on both sides of the first liquid pipe 201 .

[0047] As an example, Figure 1 As shown, the second clamping member 2 is a pipe clamp, and the second clamping member 2 includes a first clamping plate 21 and a second clamping plate 22. The first clamping plate 21 and the second clamping plate 22 both include a semicircular clamping portion, and the two clamping portions wrap and clamp the hose portion 2022 of the second liquid pipe 202. The first clamping plate 21 and the second clamping plate 22 are connected to each other by two groups of bolt assemblies, and the two groups of bolt assemblies are relatively arranged on both sides of the second liquid pipe 202, thereby realizing the connection between the second clamping member 2 and the second liquid pipe 202.

[0048] By clamping the two clamping parts of the second clamping member 2 on the hose part 2022 of the second liquid pipe 202, the two clamping parts are relatively close to each other to squeeze the hose part 2022 and deform it, thereby improving the stability of the connection between the second clamping member 2 and the hose part 2022.

[0049] In some embodiments, Figure 2 As shown, the first clamping member 1 further includes a connecting clamp 13 , at least one of the first plate 11 and the second plate 12 is connected to the connecting clamp 13 , the connecting clamp 13 has an annular connecting groove 131 , and the connecting rope 3 is passed through the connecting groove 131 .

[0050] The connection clip 13 is provided to facilitate the connection between the connection cable 3 and the first clamping member 1 .

[0051] In some embodiments, there are two second liquid pipes 202 , the second clamping members 2 correspond to the second liquid pipes 202 one by one, the connecting rope 3 is passed through the connecting groove 131 , and both ends of the connecting rope 3 are respectively connected to the two second clamping members 2 .

[0052] The two second liquid pipes 202 are connected to the first clamping member 1 via the connecting rope 3, which can reduce the installation cost.

[0053] As an example, Figure 1 and Figure 2 As shown, the first liquid pipe 201 corresponds to the second liquid pipe 202 one by one, the pipe joint 203 corresponds to the first liquid pipe 201 one by one, the first plate 11 and the second plate 12 clamp the two pipe joints 203 at the same time, the first plate 11 and the second plate 12 are connected to each other by a group of bolt assemblies, and the bolt assembly is arranged between the two pipe joints 203. The first plate 11 and the second plate 12 on both sides of the bolt assembly are both stopped at the pipe joint 203, so that the force on the first plate 11 is balanced, thereby achieving a stable connection between the first plate 11, the second plate 12 and the pipe joint 203, and saving more bolt assemblies.

[0054] The connecting clamp 13 includes a U-shaped rod 132, a pressure plate 133 and two nuts 134. The U-shaped rod 132 is welded and fixed on the first plate 11. The pressure plate 133 has two through holes. The two ends of the U-shaped rod 132 pass through the two through holes respectively. The above-mentioned connecting groove 131 is surrounded by the U-shaped rod 132 and the pressure plate 133; both ends of the U-shaped rod 132 are provided with external threads, and the two nuts 134 are respectively matched with the two end threads of the U-shaped rod 132.

[0055] The connecting cable 3 is passed through the connecting groove 131 , and then the two nuts 134 are tightened, and the pressing plate 133 tightly presses the connecting cable 3 , so that the connection between the connecting cable 3 and the connecting clamp 13 can be achieved.

[0056] Both ends of the connecting cable 3 are connected to the bolt assembly for fixing the second clamping member 2 through connecting rings, thereby realizing the connection between the pipe joint 203 and the second liquid pipe 202 .

[0057] In other embodiments, when the number of the first liquid pipes 201 and the second liquid pipes 202 is more than two, the first plate 11 and the second plate 12 may also clamp more than two first liquid pipes 201 or pipe joints 203 at the same time, thereby reducing costs.

[0058] In some embodiments, the fall protection device 100 also includes a blocking piece 4 and a linkage assembly 5. The blocking piece 4 can be movably provided on the second liquid pipe 202 to switch the second liquid pipe 202 between a blocked state and an open state. The second liquid pipe 202 is connected to the pipe joint 203 through the linkage assembly 5 to drive the blocking piece 4 to move and switch the second liquid pipe 202 to a blocked state when the second liquid pipe 202 is relatively far away from the pipe joint 203.

[0059] It is known that when the connection between the second liquid pipe 202 and the pipe joint 203 loosens and falls off (for example, the U-shaped pin falls off), the hydraulic oil in the second liquid pipe 202 is sprayed outward under high pressure, causing waste of hydraulic oil. At the same time, it will cause the second liquid pipe 202 to swing repeatedly and significantly, posing a threat to the personal safety of the staff.

[0060] Through the above arrangement, when the second liquid pipe 202 falls off from the pipe joint 203, the blocking component 4 can be driven to automatically move relative to the second liquid pipe 202 under the action of the linkage assembly 5, and the second liquid pipe 202 is automatically switched to a blocked state, thereby reducing the leakage of hydraulic oil in the second liquid pipe 202 and reducing the large-scale swing of the second liquid pipe 202, thereby reducing safety hazards.

[0061] It is understandable that when the second liquid pipe 202 is firmly connected to the pipe joint 203 , the blocking member 4 has no blocking effect on the internal passage of the second liquid pipe 202 . In other words, the internal passage of the second liquid pipe 202 remains unobstructed.

[0062] In some embodiments, Figure 3 As shown, the blocking member 4 is rotatably connected to the second liquid pipe 202, and the linkage assembly 5 includes a first linkage and a second linkage, the first linkage and the second linkage are transmission-connected, the first linkage is connected to the blocking member 4, and the second linkage is connected to the pipe joint 203, so as to drive the blocking member 4 to rotate when the second liquid pipe 202 and the pipe joint 203 are relatively far away from each other.

[0063] With the above arrangement, when the first liquid pipe 201 falls off from the pipe joint 203, the blocking member 4 can be driven to rotate automatically through the transmission connection between the first linking member and the second linking member, thereby switching the second liquid pipe 202 to a blocking state to reduce hydraulic oil spraying.

[0064] like Figure 3 As shown, the blocking member 4 is in the shape of a circular plate, and the diameter of the blocking member 4 matches the inner diameter of the connecting portion 2021 of the second liquid pipe 202. The blocking member 4 can be rotated 90 degrees to switch the second liquid pipe 202 between the blocking state and the open state.

[0065] Optionally, a sealing ring is provided on the cylindrical side surface of the blocking member 4 .

[0066] Therefore, when the blocking member 4 blocks the second liquid pipe 202 , the blocking effect is better, thereby further reducing the leakage of hydraulic oil.

[0067] In some embodiments, Figure 4 As shown, the blocking member 4 is connected to the second liquid pipe 202 via a rotating shaft 41 , the first linking member is a gear 51 , the second linking member is a rack 52 , the gear 51 is meshed with the rack 52 , and the rack 52 is sleeved on the rotating shaft 41 and rotates synchronously.

[0068] Through the above arrangement, when the connection between the second liquid pipe 202 and the pipe joint 203 loosens and falls off, the second liquid pipe 202 first moves relatively away from the pipe joint 203, and under the meshing action of the gear 51 and the rack 52, the gear 51 rotates, thereby driving the rotating shaft 41 and the sealing member 4 to rotate, thereby achieving the blocking of the internal channel of the second liquid pipe 202.

[0069] Optionally, the axis of the rotating shaft 41 is perpendicular to and intersects with the axis of the connecting portion 2021 of the second liquid pipe 202 , and the axis of the rotating shaft 41 is perpendicular to and intersects with the axis of the blocking member 4 .

[0070] Thus, when the gear 51 drives the shaft 41 to rotate, the rotation process of the shaft 41 is more stable. When the axis of the blocking member 4 is perpendicular to the axis of the connecting portion 2021, the second liquid pipe 202 is in an open state, and when the axis of the blocking member 4 coincides with the axis of the connecting portion 2021, the second liquid pipe 202 is in a blocked state.

[0071] Optionally, the rotating shaft 41 passes through the tube wall of the connecting portion 2021 , and the rotating shaft 41 is sealed and connected to the tube wall of the connecting portion 2021 .

[0072] Thus, leakage of hydraulic oil from the connection between the rotating shaft 41 and the second fluid pipe 202 can be prevented.

[0073] In some embodiments, Figure 4 As shown, the pipe joint 203 has a clearance groove 2031. When the gear 51 is meshed with the rack 52, the gear 51 is arranged in the clearance groove 2031. The clearance groove 2031 extends along the axial direction of the second liquid pipe 202 and is open in a direction away from the first liquid pipe 201.

[0074] By providing the clearance groove 2031, when assembling the second liquid pipe 202 and the pipe joint 203, the connecting portion 2021 of the second liquid pipe 202 is inserted into the pipe joint 203, and the gear 51 can be aligned with the clearance groove 2031 and enter the clearance groove 2031, so that the gear 51 and the rack 52 can be meshed, thereby improving the convenience of installation.

[0075] In some embodiments, Figure 5 and Figure 6 The fall-off protection device 100 for the hydraulic pipeline also includes a locking assembly 6, which includes a locking piece 61 and an elastic piece 62. The locking piece 61 is arranged on the side of the first liquid pipe 201 close to the gear 51. The locking piece 61 is slidably connected to the first liquid pipe 201. The elastic piece 62 is used to apply an elastic force to the locking piece 61 toward the gear 51. The gear 51 has a locking groove 511 for cooperating with the locking piece 61; in the blocked state, the locking piece 61 is inserted into the locking groove 511.

[0076] When the second liquid pipe 202 is firmly connected to the pipe joint 203 , the second liquid pipe 202 is in an open state, the locking groove 511 and the locking member 61 are arranged in a staggered manner, and under the elastic force of the elastic member 62 , the locking member 61 stops at the side of the gear 51 close to the first liquid pipe 201 .

[0077] When the second liquid pipe 202 is detached from the pipe joint 203, the second liquid pipe 202 gradually moves away from the pipe joint 203, the gear 51 rotates, driving the blocking member 4 to rotate. When the gear 51 drives the blocking member 4 to rotate 90 degrees, the first liquid pipe 201 switches to the blocked state, the locking groove 511 is aligned with the locking member 61, and under the elastic force of the elastic member 62, the locking member 61 slides toward the direction close to the gear 51, and a part of the locking member 61 is inserted into the locking groove 511, thereby blocking the gear 51 from rotating, so that the first liquid pipe 201 remains in the blocked state.

[0078] As an example, Figure 6 As shown, the outer wall of the connecting portion 2021 of the second liquid pipe 202 has a mounting groove 2023, the locking assembly 6 is installed in the mounting groove 2023, the elastic member 62 is a spring, one end of the spring is fixedly connected to the bottom wall of the mounting groove 2023, and the other end is fixedly connected to the locking member 61. When the spring is in a natural state, a part of the locking member 61 is located in the mounting groove 2023, and the other part is inserted into the locking groove 511, so that the first liquid pipe 201 remains in a blocked state.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A fall-off protection device (100) for a hydraulic pipeline, characterized in that: The hydraulic pipeline comprises a first liquid pipe (201), a second liquid pipe (202) and a pipe joint (203), the first liquid pipe (201) and the second liquid pipe (202) being connected via the pipe joint (203), and the fall-off protection device (100) comprises: a first connecting member, to which at least one of the first liquid pipe (201) and the pipe joint (203) is connected; a second connecting piece, the second connecting piece being connected to the second liquid pipe (202); A connecting rope (3), wherein the first connecting member and the second connecting member are connected via the connecting rope (3).

2. The fall-off protection device (100) for a hydraulic pipeline according to claim 1, characterized in that: The first connecting member is a first clamping member (1), and the first clamping member (1) is clamped on the pipe joint (203); and / or The second connecting member is a second clamping member (2), and the second clamping member (2) is clamped on the second liquid pipe (202).

3. The fall-off protection device (100) for a hydraulic pipeline according to claim 2, characterized in that: The first clamping member (1) comprises a first plate (11) and a second plate (12), wherein the first plate (11) and the second plate (12) are arranged opposite to each other on two sides of the pipe joint (203), the first plate (11) and the second plate (12) are connected by a bolt assembly, and at least one of the first plate (11) and the second plate (12) is connected to the connecting cable (3).

4. The fall-off protection device (100) for hydraulic pipelines according to claim 3, characterized in that: The first clamping member (1) further comprises a connecting clamp (13), at least one of the first plate (11) and the second plate (12) being connected to the connecting clamp (13), the connecting clamp (13) having an annular connecting groove (131), and the connecting rope (3) passing through the connecting groove (131).

5. The fall-off protection device (100) for hydraulic pipelines according to claim 4, characterized in that: The number of the second liquid pipes (202) is two, the second clamping members (2) correspond to the second liquid pipes (202) one by one, and the two ends of the connecting rope (3) are respectively connected to the two second clamping members (2).

6. The fall-off protection device (100) for a hydraulic pipeline according to any one of claims 1 to 5, characterized in that: It also comprises a blocking member (4) and a linkage assembly (5), wherein the blocking member (4) is movably arranged on the second liquid pipe (202) so as to switch the second liquid pipe (202) between a blocking state and an open state; The second liquid pipe (202) is connected to the pipe joint (203) via the linkage assembly (5) so as to drive the blocking member (4) to move and switch the second liquid pipe (202) to a blocked state when the second liquid pipe (202) and the pipe joint (203) are relatively separated.

7. The fall-off protection device (100) for hydraulic pipelines according to claim 6, characterized in that: The blocking member (4) is arranged in the second liquid pipe (202) and is rotatably connected to the second liquid pipe (202). The linkage assembly (5) comprises a first linkage member and a second linkage member, the first linkage member and the second linkage member are transmission-connected, the first linkage member is connected to the blocking member (4), and the second linkage member is connected to the pipe joint (203), so as to drive the blocking member (4) to rotate when the second liquid pipe (202) and the pipe joint (203) are relatively far away from each other.

8. The fall-off protection device (100) for hydraulic pipelines according to claim 7, characterized in that: The blocking member (4) is connected to the second liquid pipe (202) via a rotating shaft (41); the first connecting member is a gear (51); the second connecting member is a rack (52); the gear (51) is meshed with the rack (52); the rack (52) is sleeved on the rotating shaft (41) and rotates synchronously.

9. The fall-off protection device (100) for hydraulic pipelines according to claim 8, characterized in that: The pipe joint (203) has a clearance groove (2031). When the gear (51) is meshed with the rack (52), the gear (51) is arranged in the clearance groove (2031). The clearance groove (2031) extends along the axial direction of the second liquid pipe (202). The clearance groove (2031) is open in a direction away from the first liquid pipe (201).

10. The fall-off protection device (100) for hydraulic pipelines according to claim 8, characterized in that: The invention also comprises a locking assembly (6), wherein the locking assembly (6) comprises a locking member (61) and an elastic member (62), wherein the locking member (61) is arranged on a side of the first liquid pipe (201) close to the gear (51), the locking member (61) is slidably connected to the first liquid pipe (201), the elastic member (62) is used to apply an elastic force to the locking member (61) toward the gear (51), and the gear (51) has a locking groove (511) for cooperating with the locking member (61); In the blocking state, the locking member (61) is inserted into the locking groove (511).

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