Protection device suitable for telescopic rod with two busy ends

Abstract

The invention belongs to the technical field of mechanical engineering, and discloses a protection device suitable for a two-end telescopic rod, which comprises a two-end telescopic rod, and a protection assembly is fixedly mounted on the outer side of the movable end of the two-end telescopic rod; the protection assembly comprises an installation ring fixedly installed at the top of the movable end of the two-end telescopic rod, a telescopic hose is fixedly installed at the top end of the installation ring and connected to the outer side of the movable end of the two-end telescopic rod in a sleeving mode, and a positioning ring is fixedly installed at the bottom end of the telescopic hose. The positioning ring is fixedly installed at the top of the fixed end of the two-end telescopic rod, lubricating oil can be automatically provided for the movable end of the two-end telescopic rod, abrasion between the two-end telescopic rod is reduced, the service life of the two-end telescopic rod is prolonged, abrasion and faults are reduced, accurate injection of the lubricating agent is guaranteed, the problem of excessive or insufficient lubricating agent is avoided, and the service life of the two-end telescopic rod is prolonged. And moreover, backflow of the lubricant is prevented, the lubricant is ensured to always flow towards the required direction, and the lubricating effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a protective device suitable for telescopic rods at both ends. Background Art

[0002] With the widespread application of mechanical devices, telescopic rods play an important role in various scenarios such as machinery, construction, and transportation because of their ability to achieve length changes. Telescopic rods with two ends are widely used in specific fields because of their characteristics of being available at both ends and strong flexibility. However, existing telescopic rods with two ends are difficult to solve during use, such as increased wear and easy structural damage. These problems reduce the service life and use efficiency of the telescopic rods. In addition, traditional protective devices are improperly designed and cannot fully and effectively protect the telescopic rods. Sometimes they may even further damage the telescopic rods during use, increasing maintenance costs and reducing mechanical work efficiency. Summary of the invention

[0003] The present invention aims at the problem that the prior art cannot fully and effectively protect the telescopic rod, sometimes even further damages the telescopic rod during use, increases maintenance costs, reduces mechanical working efficiency, and causes increased wear and easy damage to the structure. The present invention proposes the following technical solutions: A protective device suitable for a telescopic rod with two ends, comprising: a telescopic rod with two ends, wherein a protective component is fixedly installed on the outer side of the movable end of the telescopic rod; The protection component includes a mounting ring fixedly mounted on the top of the movable end of the telescopic rod at both ends, a telescopic hose fixedly mounted on the top of the mounting ring and the telescopic hose is sleeved on the outer side of the movable end of the telescopic rod at both ends, a positioning ring fixedly mounted on the bottom end of the telescopic hose, the positioning ring fixedly mounted on the top of the fixed end of the telescopic rod at both ends, a plurality of placement cavities are provided inside the positioning ring, a liquid inlet hole is provided at the middle position of the top of the placement cavity, a drainage groove is provided at the bottom end of the inner wall of the positioning ring, a hydrophobic membrane is fixedly mounted equidistantly inside the drainage groove, and an extrusion plate is laterally slidably connected inside the placement cavity.

[0004] As a preferred embodiment of the above technical solution, a positioning rod is symmetrically fixedly installed on one end surface of the extrusion plate, a clamping block is fixedly installed on one end of the positioning rod, a synchronous belt is fixedly installed inside the clamping block, and a rotating wheel is symmetrically arranged on the inner wall of the synchronous belt, and the rotating wheel is rotatably connected to the inside of the positioning ring.

[0005] As a preferred embodiment of the above technical solution, a linkage rod is fixedly installed between the two relatively rotating wheels, and the linkage rod is installed with a one-way bearing 1 through an interference fit, and the outer side of the one-way bearing 1 is connected with a gear 1 through an interference fit, and the outer side of the gear 1 is meshingly connected with a gear 2, and the inner part of the gear 2 is rotatably connected with a column and the two ends of the column are fixedly installed inside the positioning ring, and the outer side of the gear 2 is meshingly connected with a sawtooth bar, and the bottom end of the sawtooth bar is fixedly installed with a spring rod 1, and the spring rod 1 is fixedly installed on the bottom end of the inner wall of the placement cavity.

[0006] As a preferred embodiment of the above technical solution, a plurality of telescopic tubes are installed on one end surface of the extrusion plate, and one end of the plurality of telescopic tubes is fixedly connected to one end surface of the placement cavity.

[0007] As a preferred embodiment of the above technical solution, the sawtooth bar is in a Z-shape, and the top end of the sawtooth bar is slidably connected to the inside of the positioning ring.

[0008] As a preferred embodiment of the above technical solution, the number of the placement cavities is set to two, the two placement cavities are connected by a drainage groove, a sealing cover is installed inside the liquid inlet hole, and a sealing gasket is sleeved on the middle of the outer surface of the extrusion plate.

[0009] As a preferred embodiment of the above technical solution, a fitting hole is opened between the opposite surfaces of the other two rotating wheels, and a boss is welded at one end of the four rotating wheels. The boss is rotatably connected to the inside of the positioning ring, and the mounting ring is clamped with a spring rod 2, and a counterweight ring is clamped with the bottom end of the spring rod 2.

[0010] As a preferred embodiment of the above technical solution, an anti-backflow component is installed inside the positioning ring at the top position of the placement cavity, and the anti-backflow component includes a limiting column fixedly installed inside the positioning ring, and a two-way threaded rod is rotatably connected to the top position of the limiting column inside the positioning ring, a protective sleeve is sleeved on the middle part of the outer surface of the two-way threaded rod, and movable plates are symmetrically installed on the outside of the two-way threaded rod and the limiting column, a coupling rod is fixedly installed on one end of the movable plate, and a one-way bearing 2 is installed on the outside of the coupling rod through an interference fit, and a fitting column is sleeved on the outside of the one-way bearing 2.

[0011] As a preferred embodiment of the above technical solution, the movable plate and the limiting column are slidably connected, the movable plate and the bidirectional threaded rod are threadedly connected, and the outer side of the fitting column and the inner wall of the fitting hole are fitted with each other.

[0012] The beneficial effects of the present invention are: (1) It can automatically provide lubricating oil to the movable ends of the telescopic rods at both ends, reducing the wear between the telescopic rods at both ends, extending their service life, reducing wear and failure, and ensuring accurate injection of lubricant to avoid problems of excessive or insufficient lubricant, and preventing the backflow of lubricant, ensuring that the lubricant always flows in the required direction, thereby improving the lubrication effect; (2) It can effectively protect the telescopic part of the movable end and the fixed end of the telescopic rod, prevent external dust from entering the connection between the movable end and the fixed end of the telescopic rod, keep the interior clean, thereby protecting the internal seals and moving parts and extending their service life; (3) It effectively limits the radial movement direction of the extrusion plate, ensures the stability of the device in a specific operating mode, improves the accuracy and safety of the operation, and can effectively prevent movement or accidental movement, improve safety performance, reduce equipment wear, and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure shows a schematic structural diagram of a protective device applicable to a telescopic rod at both ends in Example 1; Figure 2 What is shown is a schematic diagram of the structure of the protection component in Example 1; Figure 3 Shown is a cross-sectional view of the protection assembly in Example 1; Figure 4 It is shown that Figure 3 A in the enlarged view; Figure 5 Shown is a cross-sectional view of the positioning ring in Example 1; Figure 6 It is shown that Figure 5 The enlarged view of point B in the figure; Figure 7 The figure shows a schematic diagram of the installation structure of the clamping block in Example 1; Figure 8 It is shown that Figure 7 The enlarged view of point C in the figure; Fig. 9 The figure shows the installation structure diagram of the gear 2 in the embodiment 1; Fig.10 It is shown that Fig. 9 The enlarged view of point D in the figure; Fig.11 Shown is a schematic diagram of the structure of the anti-backflow assembly in Example 1; Fig.12 It is shown that Fig.11 Enlarged view of point E in FIG.

[0014] In the figure: 1. Telescopic rods at both ends; 2. Protective assembly; 21. Mounting ring; 22. Telescopic hose; 23. Positioning ring; 24. Placement cavity; 25. Liquid inlet hole; 26. Rotating wheel; 27. Synchronous belt; 28. Clamping block; 29. ​​Positioning rod; 210. Extrusion plate; 211. Linkage rod; 212. One-way bearing 1; 213. Gear 1; 214. Gear 2; 215. Column; 216. Sawtooth bar; 217. Spring rod 1; 218. Telescopic tube; 219. Fitting hole; 220. Drain trough; 221. Hydrophobic membrane; 222. Spring rod 2; 223. Counterweight ring; 3. Anti-backflow assembly; 31. Limit column; 32. Bidirectional threaded rod; 33. Protective sleeve; 34. Moving plate; 35. Coupling rod; 36. One-way bearing 2; 37. Fitting column. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0016] Embodiment 1:

[0017] The present invention provides a protective device suitable for telescopic rods at both ends, such as Figures 1 to 12 As shown, it includes a telescopic rod 1 at both ends, and a protective component 2 is fixedly installed on the outer side of the movable end of the telescopic rod 1; The protective component 2 includes a mounting ring 21 fixedly mounted on the top of the movable end of the telescopic rod 1 at both ends, a telescopic hose 22 fixedly mounted on the top of the mounting ring 21 and the telescopic hose 22 is sleeved on the outer side of the movable end of the telescopic rod 1 at both ends, a positioning ring 23 fixedly mounted on the bottom end of the telescopic hose 22, the positioning ring 23 fixedly mounted on the top of the fixed end of the telescopic rod 1 at both ends, a plurality of placement cavities 24 are provided inside the positioning ring 23, a liquid inlet hole 25 is provided at the middle position of the top of the placement cavity 24, a drainage groove 220 is provided at the bottom end of the inner wall of the positioning ring 23, a hydrophobic membrane 221 is fixedly mounted equidistantly inside the drainage groove 220, and an extrusion plate 210 is laterally slidably connected inside the placement cavity 24.

[0018] like Figures 4 to 7 As shown, a positioning rod 29 is symmetrically fixedly installed on one end of the extrusion plate 210, a clamping block 28 is fixedly installed on one end of the positioning rod 29, a synchronous belt 27 is fixedly installed inside the clamping block 28, a rotating wheel 26 is symmetrically arranged on the inner wall of the synchronous belt 27, the rotating wheel 26 is rotatably connected to the inside of the positioning ring 23, the clamping block 28 is composed of a bolt, a nut and a concave plate, the inside of the concave plate is penetrated by a bolt, the outside of the bolt is located at the bottom end of the concave plate and is connected to a nut by thread, and the bolt is penetrated and connected to the inside of the synchronous belt 27; As one of the rotating wheels 26 rotates, the rotating wheel 26 drives the synchronous belt 27 to run when it rotates, and the synchronous belt 27 drives the clamping block 28 to move when it runs, and the clamping block 28 drives the positioning rod 29 to move when it moves, and the positioning rod 29 drives the extrusion plate 210 to move when it moves, and the extrusion plate 210 squeezes the lubricating oil inside the placement cavity 24 when it moves, thereby changing the difficulty of squeezing the lubricating oil inside the placement cavity 24, thereby facilitating the lubricating oil to be discharged along the inside of the positioning ring 23.

[0019] like Figures 5 to 8 As shown, a linkage rod 211 is fixedly installed between two opposite rotating wheels 26, and a one-way bearing 212 is installed on the linkage rod 211 through interference fit, and a gear 213 is connected to the outer side of the one-way bearing 212 through interference fit, and a gear 214 is meshedly connected to the outer side of the gear 213, and a column 215 is rotatably connected to the inner side of the gear 214, and both ends of the column 215 are fixedly installed inside the positioning ring 23, and a sawtooth bar 216 is meshedly connected to the outer side of the gear 214, and a spring rod 217 is fixedly installed at the bottom end of the sawtooth bar 216, and the spring rod 217 is fixedly installed at the bottom end of the inner wall of the placement cavity 24; The telescopic rod 1 at both ends drives the mounting ring 21 to move during the telescopic process, and the mounting ring 21 drives the telescopic hose 22 to be compressed when it moves. At this time, when the mounting ring 21 moves and fits with the sawtooth bar 216, the sawtooth bar 216 is driven to descend. When the sawtooth bar 216 descends, it drives the gear 214 to rotate and drives the spring rod 1 217 to be compressed. Since the gear 214 drives the gear 1 213 to rotate when it rotates, the one-way bearing 1 212 is operated when the gear 1 213 rotates, and the one-way bearing 1 212 cannot be used to drive the spring rod 1 217 to be compressed. The linkage rod 211 rotates, and when the mounting ring 21 and the sawtooth bar 216 are separated, the tension of the spring rod 1 217 drives the sawtooth bar 216 to reset. When the sawtooth bar 216 resets, it drives the gear 2 214 to rotate. When the gear 214 rotates, it drives the gear 1 213 to rotate. When the gear 214 rotates, it drives the linkage rod 211 to rotate through the one-way bearing 1 212. When the linkage rod 211 rotates, it drives the rotating wheel 26 to rotate, which can facilitate the rotation of the rotating wheel 26 and change the difficulty of rotating the rotating wheel 26.

[0020] like Figures 5 to 8As shown, a plurality of telescopic tubes 218 are installed on one end face of the extrusion plate 210. The telescopic tubes 218 are composed of two sleeves, one of which is slidably connected to the inside of the other sleeve. One end of the plurality of telescopic tubes 218 is fixedly connected to one end face of the placement cavity 24. The number of telescopic tubes 218 is set to four in total. The four telescopic tubes 218 can limit the position of the extrusion plate 210 when it moves, which changes the difficulty of limiting the extrusion plate 210 and makes it easy to pull the extrusion plate 210 to reset, changing the difficulty of resetting the extrusion plate 210. The sawtooth bar 216 is in a Z shape, and the top end of the sawtooth bar 216 is slidably connected to the inside of the positioning ring 23, which can facilitate the position limiting of the sawtooth bar 216 to prevent the sawtooth bar 216 from swinging when it moves.

[0021] like Figures 3 to 6 As shown, the number of placement chambers 24 is set to two, the two placement chambers 24 are connected through the drainage groove 220, a sealing cover is installed inside the liquid inlet hole 25, and a sealing gasket is sleeved in the middle of the outer surface of the extrusion plate 210; The sealing cover is convenient for blocking the liquid inlet hole 25 to prevent the lubricating oil from flowing back, and the sealing gasket increases the sealing performance of the joint between the extrusion plate 210 and the placement cavity 24 to prevent the problem of liquid penetration.

[0022] like Figures 5 to 8 As shown, a fitting hole 219 is provided between the opposite surfaces of the other two rotating wheels 26, and a boss is welded at one end of each of the four rotating wheels 26, which is rotatably connected to the inside of the positioning ring 23, so as to facilitate the rotation of the rotating wheel 26 and change the difficulty of rotating the rotating wheel 26. A spring rod 222 is clamped and installed inside the mounting ring 21, and a counterweight ring 223 is clamped and installed at the bottom end of the spring rod 222, and the counterweight ring 223 is slidably connected to the inside of the mounting ring 21. The tension of the spring rod 222 is greater than the tension of the spring rod 1 217. Under the same external force, the spring rod with smaller tension (i.e., the spring rod 1 217) will be more easily deformed or contracted. When the extrusion plate 210 moves and fits against the inner wall of the placement cavity 24, the extrusion plate 210 cannot move at this time, so that the linkage rod 211, the one-way bearing 212, the gear 1 213, the gear 214, the column 215, the sawtooth bar 216 and the spring rod 1 217 in the process of driving the extrusion plate 210 to move cannot operate. At this time, the sawtooth bar 216 cannot descend, but the sawtooth bar 216 can rise. The sawtooth bar 216 rises and is exposed at the top of the positioning ring 23. At this time, when the mounting ring 21 descends and fits against the sawtooth bar 216, the counterweight ring 223 rises along the inside of the mounting ring 21 due to the obstruction of the sawtooth bar 216. At this time, the spring rod 222 is pressed together, so that the bottom end of the mounting ring 21 and the positioning ring 23 can fit together, preventing the device from being unable to operate when the extrusion plate 210 moves to the final point.

[0023] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Fig.11 and Fig.12 As shown, an anti-backflow component 3 is installed at the top position of the placement cavity 24 inside the positioning ring 23, and the anti-backflow component 3 includes a limiting column 31 fixedly installed inside the positioning ring 23, and a bidirectional threaded rod 32 is rotatably connected at the top position of the limiting column 31 inside the positioning ring 23, and a protective sleeve 33 is sleeved on the middle part of the outer surface of the bidirectional threaded rod 32, and a moving plate 34 is symmetrically installed on the outside of the bidirectional threaded rod 32 and the limiting column 31, and a coupling rod 35 is fixedly installed at one end of the moving plate 34, and a one-way bearing 36 is installed on the outside of the coupling rod 35 through interference fit, and a matching column 37 is sleeved on the outside of the one-way bearing 36, and the moving plate 34 and the limiting column 31 are slidably connected, and the moving plate 34 and the bidirectional threaded rod 32 are threadedly connected, and the outer side of the matching column 37 and the inner wall of the matching hole 219 fit each other; As the person rotates the two-way threaded rod 32, the two-way threaded rod 32 drives the movable plate 34 to move along the outside of the limiting column 31 when it rotates. At this time, the movable plate 34 drives the coupling rod 35 to move when it moves. The coupling rod 35 drives the one-way bearing 2 36 to move when it moves. The one-way bearing 2 36 drives the fitting column 37 to enter the fitting hole 219 when it moves, so that the fitting column 37 and the rotating wheel 26 are connected, which changes the connection difficulty between the fitting column 37 and the rotating wheel 26.

[0024] Working principle: During actual use of the device, personnel reset the extrusion plate 210. When the extrusion plate 210 is reset, the personnel rotate the two-way threaded rod 32. When the two-way threaded rod 32 rotates, it drives the movable plate 34 to move along the outside of the limiting column 31. At this time, when the movable plate 34 moves, it drives the coupling rod 35 to move. When the coupling rod 35 moves, it drives the one-way bearing 2 36 to move. When the one-way bearing 2 36 moves, it drives the fitting column 37 to enter the fitting hole 219, so that the fitting column 37 and the rotating wheel 26 are separated. At this time, the one-way bearing 2 36 cannot limit the rotation direction of the rotating wheel 26. Then the personnel pull the extrusion plate 210 to reset through the telescopic tube 218. When the extrusion plate 210 is reset, it drives the positioning rod 29 to move. When the positioning rod 29 moves, it drives the clamping block 28 to move. The clamping block 28 moves When the synchronous belt 27 is running, the synchronous belt 27 drives the rotating wheel 26 to rotate. When the rotating wheel 26 rotates, the linkage rod 211 is driven to rotate, and under the action of the linkage rod 211, the linkage rod 211 rotates. On the contrary, when the fitting column 37 enters the fitting hole 219 of the rotating wheel 26, the fitting column 37 and the rotating wheel 26 are connected, so that the rotating wheel 26 can only run in a single direction, and then the extrusion plate 210 can only move toward the center of the positioning ring 23, preventing the extrusion plate 210 from resetting, effectively limiting the radial movement direction of the extrusion plate 210, ensuring the stability of the device in a specific operation mode, improving the accuracy and safety of the operation, and effectively preventing swaying or accidental movement, improving safety performance and reducing equipment wear, and extending its service life; Then, inject lubricating oil along the liquid inlet hole 25, and the lubricating oil is stored in the placement cavity 24 at this time. Then, close the liquid inlet hole 25, and then install the positioning ring 23 of the protection component 2 and the fixed end of the telescopic rod 1 at both ends, and then sleeve the telescopic hose 22 on the outer side of the movable end of the telescopic rod 1 at both ends. Finally, install the installation ring 21 on the top of the movable end of the telescopic rod 1 at both ends, which can effectively protect the telescopic part of the movable end and the fixed end of the telescopic rod 1 at both ends, prevent external dust from entering the connection between the movable end and the fixed end of the telescopic rod 1 at both ends, keep the interior clean, thereby protecting the internal seal and movable parts and extending their service life; Finally, when the telescopic rods 1 at both ends are stretched, the telescopic hose 22 is stretched through the mounting ring 21, and the spring rod 222 and the counterweight ring 223 are separated from the sawtooth bar 216. The tension of the spring rod 1 217 drives the sawtooth bar 216 to reset. When the sawtooth bar 216 is reset, it drives the gear 214 to rotate. When the gear 214 rotates, it drives the gear 1 213 to rotate. When the gear 214 rotates, it drives the linkage rod 211 to rotate through the one-way bearing 1 212. When the linkage rod 211 rotates, it drives the rotating wheel 26 to rotate. When the rotating wheel 26 rotates, it drives the synchronous belt 27 to run. When the synchronous belt 27 runs, it drives the clamping block 28 to move. When the clamping block 28 moves, it drives the positioning rod 29 to move. When the positioning rod 29 moves, it drives the extrusion plate 210 to move. At this time, the other two rotating wheels 26 drive the fitting column 37 to rotate. When the fitting column 37 rotates, it drives the one-way bearing 23 6 is in operation, because the one-way bearing 236 cannot be reversed, the synchronous belt 27 can only rotate in one direction, and because the positioning rod 29 drives the extrusion plate 210 to stretch during the movement, the extrusion plate 210 is limited by the stretched telescopic tube 218 during the movement, and the extrusion plate 210 is squeezed to squeeze the lubricating oil inside the placement cavity 24 when the extrusion plate 210 moves, so that the inside of the placement cavity 24 is pressurized, and when the pressure increases, the hydrophobic membrane 221 opens and closes, so that the lubricating oil inside the placement cavity 24 is sprayed on the outer side of the movable end of the two busy telescopic rods 1, and the lubricating oil can be automatically provided to the movable ends of the two busy telescopic rods 1, reducing the wear between the two busy telescopic rods 1, extending its service life, reducing wear and failure, and ensuring the accurate injection of lubricant, avoiding the problem of excessive or insufficient, and preventing the backflow of lubricant, ensuring that the lubricant always flows in the required direction, and improving the lubrication effect; When the telescopic rods 1 at both ends drive the mounting ring 21 to move during the compression process, the mounting ring 21 moves and drives the telescopic hose 22 to be compressed. At this time, when the mounting ring 21 moves and drives the counterweight ring 223 and the sawtooth bar 216 to fit together, the counterweight ring 223 drives the sawtooth bar 216 to descend. When the sawtooth bar 216 descends, it drives the gear 214 to rotate and drives the spring rod 1 217 to be compressed. When the gear 214 rotates, it drives the gear 1 213 to rotate. When the gear 1 213 rotates, the one-way bearing 1 212 runs, and the one-way bearing 1 212 cannot be used to drive the linkage rod 211 to rotate. On the contrary, the linkage rod 211 is driven to rotate, so that the linkage rod 211 can rotate in one direction all the time, and then the extrusion plate 210 can be driven to move in one direction, which changes the driving difficulty of the extrusion plate 210, thereby ensuring that the extrusion plate 210 can squeeze the lubricating oil inside the placement cavity 24 for multiple times. And when the extrusion plate 210 moves and fits against the inner wall of the placement cavity 24, the extrusion plate 210 cannot move at this time, so that the linkage rod 211, the one-way bearing 212, the gear 1 213, the gear 214, the column 215, the sawtooth bar 216 and the spring rod 1 217 in the process of driving the extrusion plate 210 to move cannot operate. At this time, the sawtooth bar 216 cannot descend, but the sawtooth bar 216 can rise. The sawtooth bar 216 rises and is exposed at the top of the positioning ring 23. At this time, when the mounting ring 21 descends and fits against the sawtooth bar 216, the counterweight ring 223 rises along the inside of the mounting ring 21 due to the obstruction of the sawtooth bar 216. At this time, the spring rod 222 is pressed together, so that the bottom end of the mounting ring 21 and the positioning ring 23 can fit together, preventing the device from being unable to operate when the extrusion plate 210 moves to the final point.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A protective device suitable for telescopic rods at both ends, characterized in that: include: A telescopic rod (1) with two ends, wherein a protective component (2) is fixedly mounted on the outer side of the movable end of the telescopic rod (1); The protection component (2) comprises a mounting ring (21) fixedly mounted on the top of the movable end of the telescopic rod (1) at both ends, a telescopic hose (22) fixedly mounted on the top of the mounting ring (21), and the telescopic hose (22) is sleeved on the outer side of the movable end of the telescopic rod (1) at both ends, a positioning ring (23) fixedly mounted on the bottom of the telescopic hose (22), and the positioning ring (23) fixedly mounted on the top of the fixed end of the telescopic rod (1) at both ends, a plurality of placement cavities (24) are provided inside the positioning ring (23), a liquid inlet hole (25) is provided at the middle position of the top of the placement cavity (24), a liquid drainage groove (220) is provided at the bottom end of the inner wall of the positioning ring (23), a hydrophobic membrane (221) is fixedly mounted equidistantly inside the liquid drainage groove (220), and an extrusion plate (210) is laterally slidably connected inside the placement cavity (24).

2. A protective device for a telescopic rod with two ends according to claim 1, characterized in that: A positioning rod (29) is symmetrically fixedly mounted on one end surface of the extrusion plate (210), a clamping block (28) is fixedly mounted on one end of the positioning rod (29), a synchronous belt (27) is fixedly mounted inside the clamping block (28), a rotating wheel (26) is symmetrically arranged on the inner wall of the synchronous belt (27), and the rotating wheel (26) is rotatably connected to the inside of the positioning ring (23).

3. A protective device for a telescopic rod with two ends according to claim 2, characterized in that: A linkage rod (211) is fixedly installed between two opposing rotating wheels (26); a one-way bearing (212) is installed on the linkage rod (211) through interference fit; a gear (213) is connected to the outer side of the one-way bearing (212) through interference fit; a gear (214) is meshedly connected to the outer side of the gear (213); a column (215) is rotatably connected to the inner side of the gear (214); both ends of the column (215) are fixedly installed inside the positioning ring (23); a sawtooth bar (216) is meshedly connected to the outer side of the gear (214); a spring rod (217) is fixedly installed at the bottom end of the sawtooth bar (216); and the spring rod (217) is fixedly installed at the bottom end of the inner wall of the placement cavity (24).

4. A protective device for a telescopic rod with two ends according to claim 1, characterized in that: A plurality of telescopic tubes (218) are installed on one end surface of the extrusion plate (210), and one end of the plurality of telescopic tubes (218) is fixedly connected to an end surface of the placement cavity (24).

5. A protective device for a telescopic rod with two ends according to claim 3, characterized in that: The sawtooth bar (216) is in a Z-shape, and the top end of the sawtooth bar (216) is slidably connected to the inside of the positioning ring (23).

6. A protective device for a telescopic rod with two ends according to claim 2, characterized in that: The number of the placement cavities (24) is set to two in total, and the two placement cavities (24) are connected via a liquid drainage groove (220). A sealing cover is installed inside the liquid inlet hole (25), and a sealing gasket is sleeved on the middle part of the outer surface of the extrusion plate (210).

7. A protective device for a telescopic rod with two ends according to claim 3, characterized in that: A fitting hole (219) is provided between the opposing surfaces of the other two rotating wheels (26); a boss is welded to one end of each of the four rotating wheels (26); the boss is rotatably connected to the inside of the positioning ring (23); a second spring rod (222) is clamped and installed on the mounting ring (21); a counterweight ring (223) is clamped and installed at the bottom end of the second spring rod (222).

8. A protective device for a telescopic rod with two ends according to claim 1, characterized in that: An anti-backflow component (3) is installed inside the positioning ring (23) at the top position of the placement cavity (24). The anti-backflow component (3) includes a limiting column (31) fixedly installed inside the positioning ring (23). A bidirectional threaded rod (32) is rotatably connected to the top position of the limiting column (31) inside the positioning ring (23). A protective sleeve (33) is sleeved on the middle part of the outer surface of the bidirectional threaded rod (32). A movable plate (34) is symmetrically installed on the outer side of the bidirectional threaded rod (32) and the limiting column (31). A coupling rod (35) is fixedly installed on one end of the movable plate (34). A one-way bearing (36) is installed on the outer side of the coupling rod (35) through interference fit. A fitting column (37) is sleeved on the outer side of the one-way bearing (36).

9. A protective device for a telescopic rod with two ends according to claim 8, characterized in that: The movable plate (34) and the limiting column (31) are slidably connected, the movable plate (34) and the bidirectional threaded rod (32) are threadedly connected, and the outer side of the fitting column (37) and the inner wall of the fitting hole (219) are in contact with each other.

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