Hydraulic oil cylinder for telescopic boom of overhead working truck

Abstract

The hydraulic oil cylinder comprises an oil cylinder and a piston rod, the piston rod is slidably connected into the oil cylinder, an end cover is arranged at one end of the oil cylinder, one end of the piston rod penetrates through the end cover and is slidably connected with the end cover, a cleaning ring is arranged on the face, away from the oil cylinder, of the end cover, and the outer surface of the piston rod is sleeved with the cleaning ring. A plurality of arc-shaped scrapers are evenly distributed on the inner circumferential face of the cleaning ring at equal intervals, and the inner side faces of the arc-shaped scrapers abut against the outer surface of the piston rod. In the telescopic movement process of the piston rod, the multiple arc-shaped scraping rings do relative reciprocating movement on the outer surface of the piston rod, the arc-shaped scraping rings scrape particle dust attached to the outer surface of the piston rod out of the outer surface of the piston rod, and the probability that the particle dust is attached to the outer surface of the piston rod is reduced. The effect of prolonging the service life of the hydraulic oil cylinder is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to a hydraulic cylinder for a telescopic boom of an aerial work vehicle. Background Art

[0002] When aerial work vehicles are performing aerial work, they need telescopic arm equipment to adapt to work requirements at different heights. Telescopic arm equipment usually uses the oil pressure in the hydraulic cylinder to push the piston rod to move, driving the telescopic arm at the other end of the piston rod to achieve movements such as telescoping and swinging.

[0003] However, a part of the piston rod of a conventional hydraulic cylinder is exposed to the air for a long time. At this time, small particles of dust will adhere to the surface of the piston rod. When the hydraulic cylinder drives the piston rod to perform telescopic movements, these small particles of dust can easily enter the cylinder, affecting the stability and reliability of the hydraulic cylinder and reducing the service life of the hydraulic cylinder, which is an obvious shortcoming. Utility Model Content

[0004] In order to increase the service life of the hydraulic cylinder, the present application provides a hydraulic cylinder for a telescopic boom of an aerial work vehicle.

[0005] The present application provides a hydraulic cylinder for a telescopic boom of an aerial work vehicle using the following technical solution:

[0006] A hydraulic cylinder for a telescopic boom of an aerial work vehicle comprises a cylinder and a piston rod, wherein the cylinder is provided with an oil inlet pipe and an oil outlet pipe, the piston rod is slidably connected in the cylinder, an end cover is provided at one end of the cylinder, one end of the piston rod passes through the end cover and is slidably connected to the end cover, a cleaning ring is provided on a side of the end cover away from the cylinder, the cleaning ring is sleeved on the outer surface of the piston rod, a plurality of arc scrapers are evenly distributed on the inner circumference of the cleaning ring, and the inner side surfaces of the arc scrapers abut against the outer surface of the piston rod.

[0007] By adopting the above technical solution, in the process of the hydraulic cylinder driving the piston rod to perform telescopic movement, multiple arc-shaped scraper rings move back and forth relative to the outer surface of the piston rod. The arc-shaped scraper rings scrape the dust particles attached to the outer surface of the piston rod off the outer surface of the piston rod, reducing the probability of dust particles adhering to the outer surface of the piston rod, thereby reducing the probability of dust particles entering the cylinder, thereby improving the stability of the hydraulic cylinder during operation, and thus extending the service life of the hydraulic cylinder.

[0008] Optionally, a groove is provided on the inner side wall of the cleaning ring, and the groove is annular. A plurality of arc-shaped scrapers are slidably connected in the groove. A clamping groove corresponding to the arc-shaped scrapers is provided on the inner side wall of the groove. The clamping groove is connected to the groove, and a clamping spring is provided in the clamping groove. One end of the clamping spring is connected to the inner side wall of the clamping groove, and the other end is connected to the arc-shaped scraper.

[0009] By adopting the above technical solution, the arc scraper is always pressed against the outer surface of the piston rod under the action of the pressing spring, so that dust particles attached to the outer surface of the piston rod can be cleaned when the piston rod moves. At the same time, when the arc scraper is worn and the scraper cannot be tightly attached to the outer surface of the piston rod, the pressing spring pushes the arc scraper toward the piston rod, ensuring that the arc scraper and the piston rod always maintain abutment state, thereby improving the cleaning effect of the arc scraper.

[0010] Optionally, a dust removal box is provided on the outer surface of the cleaning ring, and blowing components are provided on opposite sides of the dust removal box. The blowing component includes an elastic airbag arranged in the dust removal box, and a blowing nozzle is connected to the elastic airbag, and the blowing direction of the blowing nozzle is set toward the arc scraper. An extrusion component corresponding to the blowing component one by one is provided in the dust removal box, and the extrusion component is used to extrude the elastic airbag.

[0011] By adopting the above technical solution, the extrusion component squeezes the elastic airbag. After the elastic airbag is squeezed, the gas in the elastic airbag moves to the blowing nozzle. The gas blown out of the blowing nozzle lifts up the dust particles accumulated on the arc scraper, reducing the possibility of excessive accumulation of dust particles and causing damage to the outer surface of the piston rod and the arc scraper, thereby further ensuring the cleaning effect of the arc scraper.

[0012] Optionally, the extrusion assembly includes a connecting shaft arranged on the dust removal box, and a semicircular plate is rotatably connected to the connecting shaft. When the elastic airbag is squeezed, one end of the semicircular plate abuts against the piston rod, and the other end abuts against the elastic airbag.

[0013] By adopting the above technical solution, during the process of the piston rod extending, the piston rod pushes the semicircular plate to rotate. During the process of one end of the semicircular plate being pushed, the other end of the semicircular plate gradually squeezes the elastic airbag. After the elastic airbag is squeezed, the gas in the elastic airbag is blown out from the blowing nozzle, thereby lifting up the dust accumulated on the arc scraper.

[0014] Optionally, a second torsion spring is sleeved on the connecting shaft, one end of the second torsion spring is connected to the side wall of the connecting shaft, and the other end is connected to the outer surface of the semicircular plate. When the second torsion spring is in a natural state, the diameter direction of the semicircular plate is perpendicular to the length direction of the piston rod.

[0015] By adopting the above technical solution, during the process of the piston rod retracting into the cylinder, the pushing force on the semicircular plate close to one end of the piston rod gradually decreases, and under the action of the torsion spring restoring the deformation, the torsion spring drives the semicircular plate to reset. At this time, the extrusion force on the elastic airbag disappears, and the elastic airbag remains in an un-extruded state. The setting of the torsion spring ensures the stability of the continuous operation of the extrusion assembly, and ensures that during the reciprocating telescopic motion of the piston rod, the extrusion assembly can work intermittently with the extension and retraction of the piston rod, thereby improving the stability of the operation of the blowing assembly.

[0016] Optionally, ear plates are provided at opposite ends of the outer surface of the cleaning ring, threaded holes are provided on the ear plates and the end covers, and locking bolts are threadedly connected in the threaded holes.

[0017] By adopting the above technical solution, the setting of the locking bolt realizes the detachable connection between the cleaning ring and the end cover. When the cleaning effect of the arc scraper deteriorates, the worker can replace the cleaning ring as a whole by unscrewing the locking nut. The maintenance process is simple and quick, and the cleaning effect of the outer surface of the piston rod is guaranteed.

[0018] Optionally, a connecting ring is provided at the oil inlet end of the oil inlet pipe, a filter bag is provided under the connecting ring, the filter bag is arranged inside the oil inlet pipe, blocks are provided at both opposite ends of the outer wall of the oil inlet pipe, a connecting assembly corresponding to the block is provided on the connecting ring, and the connecting ring is detachably connected to the oil inlet pipe through the connecting assembly.

[0019] By adopting the above technical solution, during the process of injecting oil into the oil inlet pipe, the filter bag blocks impurities such as dust particles in the hydraulic oil in the filter bag, thereby reducing the probability of dust particles and impurities entering the interior of the oil cylinder, improving the stability of the hydraulic cylinder during operation, thereby extending the service life of the hydraulic cylinder, and the connecting component realizes a detachable connection between the filter bag and the oil inlet pipe, ensuring the filtering effect of the filter bag.

[0020] Optionally, the connecting assembly includes two connecting rods, the two connecting rods are connected to a rotating shaft for common rotation, a clamping block is fixedly connected to the rotating shaft, a first torsion spring is sleeved on the rotating shaft, one end of the first torsion spring is connected to the outer wall of the rotating shaft, and the other end is connected to the surface of the connecting rod, and when the first torsion spring is in a natural state, the clamping block is clamped on the stop block.

[0021] By adopting the above technical solution, when too many dust particles accumulate in the filter bag, the worker turns the block to move the block away from the stopper, and then lifts up the connecting ring to separate the filter bag from the oil inlet pipe. After cleaning, the worker turns the block to a vertical direction. When the filter bag is installed in the oil inlet pipe, the worker cancels the external force applied to the block, and the first torsion spring drives the block to reset, and the block abuts against the stopper. At this time, the filter bag is fixed in the oil inlet pipe.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The present application sets a filter bag and an arc-shaped scraper. The filter bag can prevent dust particles in the hydraulic oil from entering the interior of the hydraulic cylinder. The arc-shaped scraper can remove the small probability of dust adhering to the outer surface of the piston rod when the piston rod makes reciprocating motion, further reducing the probability of dust particles entering the interior of the hydraulic cylinder, thereby improving the stability of the hydraulic cylinder during operation and extending the service life of the hydraulic cylinder.

[0024] 2. The present application sets up an extrusion assembly and a blowing assembly, and the blowing assembly is driven by the extrusion assembly. The blowing assembly can lift up the dust particles accumulated on the arc scraper, reducing the possibility of excessive accumulation of dust particles and causing damage to the outer surface of the piston rod and the arc scraper, thereby ensuring the cleaning effect of the arc scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of this application.

[0026] Figure 2 yes Figure 2 Enlarged view of point A in the middle.

[0027] Figure 3 It is a cross-sectional view of the cleaning ring in the embodiment of the present application.

[0028] Figure 4 This is a cross-sectional view of the dust removal box in the embodiment of the present application.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. oil cylinder; 101. end cover; 2. oil inlet pipe; 21. block; 3. oil outlet pipe; 4. connecting ring; 41. filter bag; 5. connecting assembly; 51. connecting rod; 52. rotating shaft; 53. block; 54. first torsion spring; 6. piston rod; 7. cleaning ring; 71. ear plate; 72. groove; 73. tightening groove; 74. tightening spring; 8. threaded hole; 81. locking bolt; 9. arc scraper; 10. dust removal box; 11. blowing assembly; 111. elastic airbag; 112. blowing nozzle; 12. extrusion assembly; 121. connecting shaft; 122. semicircular plate; 13. second torsion spring. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The embodiment of the present application discloses a hydraulic cylinder for a telescopic boom of an aerial work vehicle.

[0032] Reference Figure 1 and Figure 2 A hydraulic cylinder for a telescopic boom of an aerial work vehicle includes a cylinder 1. An oil inlet pipe 2 and an oil outlet pipe 3 connected to the inside of the cylinder 1 are arranged on the outer surface of the cylinder 1. Blocks 21 are arranged at opposite ends of the outer side wall of the oil inlet pipe 2. In this embodiment, the cross-section of the block 21 is triangular. A connecting ring 4 is commonly arranged on the top wall of the oil inlet pipe 2 and the block 21. A filter bag 41 is fixedly installed on the connecting ring 4, and the filter bag 41 is slidably connected to the inside of the oil inlet pipe 2.

[0033] The worker connects the oil pump with the oil inlet pipe 2 and the oil outlet pipe 3. When the oil pump injects hydraulic oil into the oil cylinder 1 through the oil inlet pipe 2, the filter bag 41 blocks impurities such as dust particles in the hydraulic oil in the filter bag 41, thereby reducing the probability of dust particles entering the oil cylinder 1 and extending the service life of the hydraulic cylinder.

[0034] Reference Figure 1 and Figure 2 Two groups of connecting components 5 are arranged on the bottom surface of the connecting ring 4, and the two groups of connecting components 5 are respectively distributed at the opposite ends of the connecting ring 4. The connecting component 5 includes two vertically arranged connecting rods 51, and the two connecting rods 51 are connected with a rotating shaft 52 for common rotation. A clamping block 53 is fixedly connected to the rotating shaft 52. In this embodiment, the cross-section of the clamping block 53 is triangular, and the opposite ends of the rotating shaft 52 are sleeved with a first torsion spring 54, one end of the first torsion spring 54 is fixedly connected to the outer side wall of the rotating shaft 52, and the other end is fixedly connected to the adjacent connecting rod 51. In the natural state of the first torsion spring 54, the inclined surface of the clamping block 53 and the inclined surface of the stopper 21 abut against each other.

[0035] When too many dust particles accumulate in the filter bag 41, the worker rotates the block 53 to move the block 53 away from the block 21, and then lifts up the connecting ring 4 to disengage the filter bag 41 from the oil inlet pipe 2. After cleaning, the worker rotates the block 53 to a vertical direction. When the filter bag 41 is installed in the oil inlet pipe 1, the worker cancels the external force applied to the block 53, and the first torsion spring drives the block 53 to reset. The block 53 abuts against the block 21, and the filter bag 51 is fixed in the oil inlet pipe 1.

[0036] Reference Figure 3An end cover 101 is fixedly connected to one end of the oil cylinder 1 close to the oil inlet pipe 2, and a piston rod 6 is slidably connected to the end cover 101. The piston rod 6 is slidably arranged inside the oil cylinder 1. A cleaning ring 7 is arranged on a side of the end cover 101 away from the oil cylinder 1. Ear plates 71 are fixedly connected to the opposite ends of the outer surface of the cleaning ring 7. The ear plate 71 and the end cover 101 are both provided with communicating threaded holes 8. The inner threads of the threaded holes 8 are connected with locking bolts 81. The cleaning ring 7 is sleeved on the outer surface of the piston rod 6. A plurality of arc scrapers 9 are evenly distributed on the inner circumference of the cleaning ring 7 at equal distances. In the present embodiment, there are four arc scrapers 9, which are spliced ​​together into a complete circle, and the inner side walls of the four arc scrapers 9 are all in contact with the outer surface of the piston rod 6.

[0037] During the process of the hydraulic cylinder driving the piston rod 6 to perform telescopic movement, multiple arc-shaped scraper rings move back and forth relative to the outer surface of the piston rod 6. During the movement of the piston rod 6, the arc-shaped scraper rings scrape the dust particles attached to the outer surface of the piston rod 6 off the outer surface of the piston rod 6, reducing the probability of dust particles adhering to the outer surface of the piston rod 6, thereby reducing the probability of dust particles entering the inside of the cylinder 1, improving the stability of the hydraulic cylinder during operation, and thus extending the service life of the hydraulic cylinder.

[0038] Reference Figure 3 A groove 72 is provided on the inner wall of the cleaning ring 7. The groove 72 is annular. Four arc scrapers 9 are slidably connected together inside the groove 72. A tightening groove 73 corresponding to the four arc scrapers 9 is provided on the inner wall of the groove 72. The four tightening grooves 73 are connected to the groove 72. A tightening spring 74 is provided in each tightening groove 73. One end of the tightening spring 74 is fixedly connected to the inner wall of the tightening groove 73, and the other end is fixedly connected to the arc scraper 9. Under the action of the tightening spring 74, the arc scraper 9 has a tendency to move toward the direction close to the piston rod 6.

[0039] The arc scraper 9 is always pressed against the outer surface of the piston rod 6 under the action of the pressing spring 74, so that the dust particles attached to the outer surface of the piston rod 6 can be cleaned when the piston rod 6 moves. At the same time, when the arc scraper 9 is worn and the scraper cannot be tightly attached to the outer surface of the piston rod 6, the pressing spring 74 pushes the arc scraper 9 to move toward the piston rod 6, ensuring that the arc scraper 9 and the piston rod 6 always maintain abutment, thereby improving the cleaning effect of the arc scraper 9.

[0040] Reference Figure 4A dust removal box 10 is fixedly installed on the outer surface of the cleaning ring, and the dust removal box 10 is sleeved on the outer surface of the piston rod 6. Two groups of blowing components 11 and extrusion components 12 are arranged in the dust removal box 10. The two groups of blowing components 11 and extrusion components 12 are symmetrically distributed about the center of the piston rod 6. Specifically, the blowing component 11 includes an elastic air bag 111 fixedly installed on the inner surface of the dust removal box 10, and the elastic air bag 111 is connected to a blowing nozzle 112. The blowing nozzle 112 is inclined and the blowing direction of the blowing nozzle 112 is toward the arc scraper 9.

[0041] Reference Figure 4 Two mounting plates (not shown in the figure) are fixedly installed at opposite ends of the dust removal box 10. The extrusion assembly 12 includes a connecting shaft 121 fixedly connected between adjacent mounting plates. A semicircular plate 122 is rotatably connected to the connecting shaft 121. In the initial state, the diameter direction of the semicircular plate 122 is perpendicular to the length direction of the piston rod 6. One end of the semicircular plate 122 abuts against the outer surface of the piston rod 6. When the piston rod 6 pushes the semicircular plate 122, the semicircular plate 122 rotates toward the elastic airbag 111. A second torsion spring 13 is sleeved on the connecting shaft 121. One end of the second torsion spring 13 is fixedly connected to the outer side wall of the connecting shaft 121, and the other end is fixedly connected to the surface of the semicircular plate 122. In the natural state of the second torsion spring 13, the diameter direction of the semicircular plate 122 is perpendicular to the length direction of the piston rod 6.

[0042] During the extension of the piston rod 6, the piston rod 6 pushes the semicircular plate 122 to rotate. During the push of one end of the semicircular plate 122, the other end of the semicircular plate 122 gradually squeezes the elastic airbag 111. After the elastic airbag 111 is squeezed, the gas in the elastic airbag 111 is blown out from the blowing nozzle 112, thereby raising the dust accumulated at the arc scraper 9, thereby reducing the possibility of excessive accumulation of dust particles and damage to the outer surface of the piston rod 6 and the arc scraper 9. During the retraction of the piston rod 6 into the cylinder 1, the pushing force on the semicircular plate 122 near one end of the piston rod 6 gradually decreases. Under the action of the second torsion spring 13 to restore the deformation, the second torsion spring 13 drives the semicircular plate 122 to reset. At this time, the squeezing force on the elastic airbag 111 disappears, and the elastic airbag 111 remains in an unsqueezed state. The provision of the second torsion spring 13 ensures the stability of the continuous operation of the extrusion assembly 12, and ensures that during the reciprocating telescopic motion of the piston rod 6, the extrusion assembly 12 can work intermittently with the extension and retraction of the piston rod 6.

[0043] The implementation principle of the hydraulic cylinder for the telescopic arm of an aerial work vehicle in the embodiment of the present application is as follows: when the hydraulic cylinder needs to be used, oil is injected into the oil inlet pipe 2 through the oil pump. During this process, the filter bag 41 blocks impurities such as dust particles in the hydraulic oil in the filter bag 41, reducing the probability of dust particles and impurities entering the interior of the cylinder 1. At the same time, during the process of the hydraulic cylinder 1 driving the piston rod 6 to perform telescopic movement, a plurality of arc-shaped scraper rings move back and forth relative to each other on the outer surface of the piston rod 6. During the movement of the piston rod 6, the arc-shaped scraper rings scrape the dust particles attached to the outer surface of the piston rod 6 out of the outer surface of the piston rod 6, reducing the probability of dust particles adhering to the outer surface of the piston rod 6, thereby reducing the probability of dust particles entering the interior of the cylinder 1, thereby improving the stability of the hydraulic cylinder 1 during operation, and thus extending the service life of the hydraulic cylinder 1.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic cylinder for a telescopic boom of an aerial work vehicle, comprising a cylinder (1) and a piston rod (6), wherein the cylinder (1) is provided with an oil inlet pipe (2) and an oil outlet pipe (3), and the piston rod (6) is slidably connected in the cylinder (1), characterized in that: An end cover (101) is provided at one end of the oil cylinder (1), one end of the piston rod (6) passes through the end cover (101) and is slidably connected to the end cover (101), a cleaning ring (7) is provided on a side of the end cover (101) away from the oil cylinder (1), the cleaning ring (7) is sleeved on the outer surface of the piston rod (6), a plurality of arc-shaped scrapers (9) are evenly distributed at equal intervals on the inner circumference of the cleaning ring (7), and the inner side surfaces of the arc-shaped scrapers (9) abut against the outer surface of the piston rod (6).

2. A hydraulic cylinder for a telescopic boom of an aerial work vehicle according to claim 1, characterized in that: The inner wall of the cleaning ring (7) is provided with a groove (72), and the groove (72) is annular. A plurality of arc-shaped scrapers (9) are slidably connected in the groove (72). The inner wall of the groove (72) is provided with a clamping groove (73) corresponding to the arc-shaped scrapers (9) one by one. The clamping groove (73) is connected to the groove (72). A clamping spring (74) is arranged in the clamping groove (73), and one end of the clamping spring (74) is connected to the inner wall of the clamping groove (73), and the other end is connected to the arc-shaped scraper (9).

3. The hydraulic cylinder for the telescopic boom of an aerial work vehicle according to claim 1, characterized in that: The outer surface of the cleaning ring (7) is provided with a dust removal box (10), and blowing components (11) are provided on opposite sides of the dust removal box (10), and the blowing component (11) comprises an elastic air bag (111) arranged in the dust removal box (10), and a blowing nozzle (112) is connected to the elastic air bag (111), and the blowing direction of the blowing nozzle (112) is arranged toward the arc-shaped scraper (9), and an extrusion component (12) corresponding to the blowing component (11) is provided in the dust removal box (10), and the extrusion component (12) is used to extrude the elastic air bag (111).

4. A hydraulic cylinder for a telescopic boom of an aerial work vehicle according to claim 3, characterized in that: The extrusion assembly (12) comprises a connecting shaft (121) arranged on the dust removal box (10), and a semicircular plate (122) is rotatably connected to the connecting shaft (121); when the elastic airbag (111) is squeezed, one end of the semicircular plate (122) abuts against the piston rod (6), and the other end abuts against the elastic airbag (111).

5. The hydraulic cylinder for the telescopic boom of an aerial work vehicle according to claim 4, characterized in that: A second torsion spring (13) is sleeved on the connecting shaft (121), one end of the second torsion spring (13) is connected to the side wall of the connecting shaft (121), and the other end is connected to the outer surface of the semicircular plate (122), and when the second torsion spring (13) is in a natural state, the diameter direction of the semicircular plate (122) is perpendicular to the length direction of the piston rod (6).

6. The hydraulic cylinder (1) for a telescopic boom of an aerial work vehicle according to claim 1, characterized in that: The two opposite ends of the outer surface of the cleaning ring (7) are provided with ear plates (71), the ear plates (71) and the end cover (101) are provided with threaded holes (8), and the threaded holes (8) are internally threadedly connected with locking bolts (81).

7. The hydraulic cylinder (1) for a telescopic boom of an aerial work vehicle according to claim 1, characterized in that: The oil inlet end of the oil inlet pipe (2) is provided with a connecting ring (4), a filter bag (41) is provided under the connecting ring (4), the filter bag (41) is arranged inside the oil inlet pipe (2), both opposite ends of the outer wall of the oil inlet pipe (2) are provided with stoppers (21), the connecting ring (4) is provided with connecting components (5) corresponding to the stoppers (21) one by one, and the connecting ring (4) is detachably connected to the oil inlet pipe (2) via the connecting components (5).

8. The hydraulic cylinder for the telescopic boom of an aerial work vehicle according to claim 7, characterized in that: The connecting assembly (5) comprises two connecting rods (51), the two connecting rods (51) are connected to a rotating shaft (52) for common rotation, a clamping block (53) is fixedly connected to the rotating shaft (52), a first torsion spring (54) is sleeved on the rotating shaft (52), one end of the first torsion spring (54) is connected to the outer wall of the rotating shaft (52), and the other end is connected to the surface of the connecting rod (51), and when the first torsion spring (54) is in a natural state, the clamping block (53) is clamped on the stopper (21).

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