Telescopic boom with lubrication function

Abstract

This utility model discloses a telescopic boom with lubrication function, including an inner boom, an outer boom, a hydraulic cylinder, a locking assembly, a sliding assembly, a limiting assembly, and an adjusting assembly. The inner boom is telescopically mounted inside the outer boom via the hydraulic cylinder. The locking assembly passes through the inner boom and the outer boom for locking the inner boom and the outer boom. The sliding assembly is located on both sides between the inner boom and the outer boom for lubricating sliding between them. The limiting assembly is located between the inner boom and the outer boom for limiting the extension distance of the inner boom. The adjusting assembly is located on both sides of the outer boom for adjusting the tightness between the inner boom and the outer boom. This utility model effectively improves the lubrication effect of the wear-resistant block, reduces the lubrication cycle, and extends the service life of the wear-resistant block and the guide rail.

Description

Technical Field

[0001] This utility model belongs to the field of telescopic boom technology, and in particular relates to a telescopic boom with lubrication function. Background Technology

[0002] To meet the requirements of a larger digging range and depth, backhoe loaders often feature telescopic booms, allowing them to extend to different lengths during operation to adapt to various digging needs. This is typically achieved by installing an inner boom inside the outer boom. The inner boom has guide rails, and the outer boom has corresponding slide rails. A hydraulic cylinder pushes the inner boom along the guide rails and slide rails of the outer boom, achieving its telescopic movement. Wear-resistant plates are installed on the contact surfaces between the outer boom's slide rails and the inner boom's guide rails, preventing wear through soft-hard contact. These wear-resistant plates are wear parts and need replacement after excessive wear. To extend the lifespan of the wear-resistant plates, manual lubrication with grease is usually performed on the guide rails. However, due to the lack of an oil reservoir, the grease is scraped off by the end faces of the wear-resistant plates during the inner boom's sliding motion, resulting in poor lubrication, significant grease waste, short maintenance intervals, severe wear of the wear-resistant plates, and a short lifespan for the wear-resistant plates. This increases labor intensity and equipment operating costs. Utility Model Content

[0003] To address some or all of the technical problems existing in the prior art, this utility model provides a telescopic boom with lubrication function, comprising an inner boom, an outer boom, a hydraulic cylinder, a locking assembly, a sliding assembly, a limiting assembly, and an adjusting assembly. The inner boom is telescopically mounted within the outer boom via the hydraulic cylinder. The locking assembly passes through the inner boom and the outer boom, locking the inner boom and the outer boom together. The sliding assembly is located on both sides between the inner boom and the outer boom, providing lubrication and sliding between them. The limiting assembly is located between the inner boom and the outer boom, limiting the extension distance of the inner boom. The adjusting assembly is located on both sides of the outer boom, adjusting the tightness between the inner boom and the outer boom. Wherein:

[0004] The sliding assembly includes a wear-resistant plate mounting base, a first wear-resistant block, a first oil pipe, a second wear-resistant block, and a second oil pipe. The wear-resistant plate mounting base is symmetrically welded to both sides of the inner side of the outer bucket rod. The first wear-resistant block is disposed between the inner bucket rod and the wear-resistant plate mounting base. The first oil pipe is disposed within the wear-resistant plate mounting base to lubricate the first wear-resistant block. The second wear-resistant block is disposed on both sides of the inner side of the outer bucket rod and is slidably connected to the inner bucket rod. The second oil pipe is disposed within the outer bucket rod to lubricate the second wear-resistant block.

[0005] Furthermore, in the aforementioned telescopic boom with lubrication function, the outer boom includes a middle plate, side plates, threaded seats, and grease nipples. The side plates are symmetrically welded to both sides of the middle plate, the threaded seats are symmetrically arranged in the middle of the side plates, and the grease nipples are arranged on the side of the side plates near the threaded seats. One end of the first oil pipe and the second oil pipe are respectively connected to the grease nipples, and a first locking hole is provided through the middle plate.

[0006] Furthermore, in the aforementioned telescopic boom with lubrication function, the inner boom includes an inner boom body, a base plate, and a guide rail. The base plate is welded to the bottom of the inner boom body, and the guide rail extends to both sides of the base plate. The guide rail and the base plate are integrally formed, and one side of the guide rail is inclined. A second locking hole is provided through the inner boom body and the guide rail.

[0007] Furthermore, in the aforementioned telescopic boom with lubrication function, the first wear-resistant block is rectangular in shape, a first oil reservoir is provided on the lower surface of the first wear-resistant block, a first oil passage is provided through the middle of the first wear-resistant block, the first oil reservoir is connected to the first oil passage, the other end of the first oil pipe is connected to the first oil passage, the first wear-resistant block is fixedly connected to the wear-resistant plate mounting base, and the lower surface of the first wear-resistant block is slidably connected to the upper surface of the guide rail.

[0008] Furthermore, in the aforementioned telescopic boom with lubrication function, the second wear-resistant block is arranged in a right-angled triangle shape, a second oil reservoir is provided on the hypotenuse of the second wear-resistant block, a second oil passage is provided through the middle of the second wear-resistant block, the second oil reservoir is connected to the second oil passage, the other end of the second oil pipe is connected to the second oil passage, the hypotenuse of the second wear-resistant block matches the inclined surface of the guide rail, the hypotenuse of the second wear-resistant block is slidably connected to the guide rail, and the bottom of the second wear-resistant block is slidably connected to the intermediate plate.

[0009] Furthermore, in the aforementioned telescopic boom with lubrication function, the locking assembly includes a pin and a snap ring pin. The pin is matched with the first locking hole and the second locking hole. Two insertion holes are arranged on the pin. The distance between the second insertion hole and the bottom of the pin is equal to the distance between the inner boom body and the bottom plate. The distance between the first insertion hole and the bottom of the pin is greater than the distance between the inner boom body and the middle plate. The snap ring pin is disposed on one of the two insertion holes.

[0010] Furthermore, in the aforementioned telescopic boom with lubrication function, the limiting component includes a first limiting block and a second limiting block. The first limiting block is welded to the front end of the intermediate plate, and the second limiting block is welded to the end of the bottom plate. The first limiting block and the second limiting block overlap each other.

[0011] Furthermore, in the aforementioned telescopic boom with lubrication function, the adjusting assembly includes an adjusting bolt, a locking nut, and a protective plate. The locking nut engages with the threaded portion of the adjusting bolt, the adjusting bolt engages with the threaded seat, the protective plate is fixed to the second wear-resistant block, and the front end of the adjusting bolt abuts against the protective plate.

[0012] Furthermore, in the aforementioned telescopic boom with lubrication function, the cylinder mounting end is hinged to the side plate via a pin, and the cylinder output end is hinged to the inner boom body via a pin.

[0013] The telescopic pole with lubrication function of this utility model has the following advantages and beneficial effects:

[0014] This invention effectively improves the lubrication effect of the wear-resistant block by setting up an oil passage and an oil storage tank, reducing the lubrication cycle and extending the service life of the wear-resistant block and guide rail. By setting up a locking component, the inner bucket rod and outer bucket rod are mechanically locked, avoiding the problem of the inner bucket rod coming out when the cylinder is depressurized. By setting up a limiting component, the service life of the cylinder is effectively improved, and damage to the cylinder is avoided by extending the cylinder too far. By setting up an adjustment component, smooth extension and retraction of the inner bucket rod is ensured. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0016] Figure 1 This is a three-dimensional structural diagram of the telescopic boom with lubrication function of this utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of AA;

[0018] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of BB;

[0019] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of CC.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1: Inner bucket rod; 11: Inner bucket rod body; 12: Base plate; 13: Guide rail; 14: Second locking hole;

[0022] 2: Outer bucket rod; 21: Middle plate; 22: First locking hole; 23: Side plate; 24: Threaded seat; 25: Grease nipple;

[0023] 3: Hydraulic cylinder;

[0024] 4: Locking component; 41: Pin; 42: Socket; 43: Snap ring pin;

[0025] 5: Sliding assembly; 51: Wear-resistant plate mounting base;

[0026] 52: First wear-resistant block; 521: First oil reservoir; 522: First oil passage hole;

[0027] 53: First oil pipeline;

[0028] 54: Second wear-resistant block; 541: Second oil reservoir; 542: Second oil passage hole;

[0029] 55: Second oil pipe;

[0030] 6: Limiting component; 61: First limiting block; 62: Second limiting block;

[0031] 7: Adjustment component; 71: Adjustment bolt; 72: Locking nut; 73: Protective plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] like Figures 1 to 4 As shown, the telescopic boom with lubrication function of this utility model includes an inner boom 1, an outer boom 2, a hydraulic cylinder 3, a locking assembly 4, a sliding assembly 5, a limiting assembly 6, and an adjusting assembly 7. The inner boom 1 is telescopically mounted inside the outer boom 2 via the hydraulic cylinder 3. The locking assembly 4 passes through the inner boom 1 and the outer boom 2 and is used to lock the inner boom 1 and the outer boom 2. The sliding assembly 5 is located on both sides between the inner boom 1 and the outer boom 2 and is used for lubrication and sliding between the inner boom 1 and the outer boom 2. The limiting assembly 6 is located between the inner boom 1 and the outer boom 2 and is used to limit the extension distance of the inner boom 1. The adjusting assembly 7 is located on both sides of the outer boom 2 and is used to adjust the tightness between the inner boom 1 and the outer boom.

[0034] The sliding assembly 5 includes a wear-resistant plate mounting base 51, a first wear-resistant block 52, a first oil pipe 53, a second wear-resistant block 54, and a second oil pipe 55. The wear-resistant plate mounting base 51 is symmetrically welded to both sides of the inner side of the outer bucket rod 2. The first wear-resistant block 52 is disposed between the inner bucket rod 1 and the wear-resistant plate mounting base 51. The first oil pipe 53 is disposed inside the wear-resistant plate mounting base 51 to lubricate the first wear-resistant block 52. The second wear-resistant block 54 is disposed inside both sides of the outer bucket rod 2 and is slidably connected to the inner bucket rod 1. The second oil pipe 55 is disposed inside the outer bucket rod 2 to lubricate the second wear-resistant block 54.

[0035] Furthermore, in the telescopic boom with lubrication function of this utility model, the outer boom 2 includes a middle plate 21, a side plate 23, a threaded seat 24 and a grease nipple 25. The side plate 23 is symmetrically welded to both sides of the middle plate 21, the threaded seat 24 is symmetrically arranged in the middle of the side plate 23, and the grease nipple 25 is arranged on the side of the side plate 23 near the threaded seat 24. One end of the first oil pipe 53 and the second oil pipe 55 are respectively connected to the grease nipple 25, and a first locking hole 22 is provided through the middle plate 21.

[0036] Furthermore, in the telescopic bucket rod with lubrication function of this utility model, the inner bucket rod 1 includes an inner bucket rod body 11, a base plate 12 and a guide rail 13. The base plate 12 is welded to the bottom of the inner bucket rod body 11, and the guide rail 13 extends and is arranged on both sides of the base plate 12. The guide rail 13 and the base plate 12 are integrally formed. One side of the guide rail 13 is inclined. The inner bucket rod body 11 and the guide rail 13 are provided with a second locking hole 14.

[0037] Furthermore, in the telescopic boom with lubrication function of this utility model, the first wear-resistant block 52 is rectangular in shape, and a first oil storage groove 521 is provided on the lower surface of the first wear-resistant block 52. A first oil passage hole 522 is provided through the middle of the first wear-resistant block 52, and the first oil storage groove 521 is connected to the first oil passage hole 522. The other end of the first oil pipe 53 is connected to the first oil passage hole 522. The first wear-resistant block 52 is fixedly connected to the wear-resistant plate mounting base 51. The lower surface of the first wear-resistant block 52 is slidably connected to the upper surface of the guide rail 13, so that the first oil pipe 53 provides grease to the first oil storage groove 521 through the first oil passage hole 522, so that the grease is stored in the first oil storage groove 521. When the guide rail 13 slides along the first wear-resistant block 52 on the upper surface of the guide rail 13, the grease in the first oil storage groove 521 is evenly coated on the guide rail 13, thereby ensuring the lubrication effect and improving the service life of the first wear-resistant block 52.

[0038] Furthermore, in the telescopic boom with lubrication function of this utility model, the second wear-resistant block 54 is arranged in a right-angled triangle shape. A second oil storage groove 541 is provided on the hypotenuse of the second wear-resistant block 54, and a second oil passage hole 542 is provided through the middle of the second wear-resistant block 54. The second oil storage groove 541 is connected to the second oil passage hole 542, and the other end of the second oil pipe 55 is connected to the second oil passage hole 542. The hypotenuse of the second wear-resistant block 54 matches the inclined surface of the guide rail 13, and the hypotenuse of the second wear-resistant block 54 is slidably connected to the guide rail 13. The bottom of the second wear-resistant block 54 is slidably connected to the middle plate 21, so that the second wear-resistant block 54 can support the sliding of the track and limit the sliding direction of the track. The second oil pipe 55 provides grease to the second oil reservoir 541 through the second oil passage 542, so that the grease is stored in the second oil reservoir 541. When the guide rail 13 slides along the inclined side of the second wear-resistant block 54 on the upper end face of the guide rail 13, the grease in the second oil reservoir 541 is evenly coated on the guide rail 13, thereby ensuring the lubrication effect and improving the service life of the second wear-resistant block 54.

[0039] Furthermore, in the telescopic boom with lubrication function of this utility model, the locking component 4 includes a pin 41 and a snap ring pin 43. The pin 41 is matched with the first locking hole 22 and the second locking hole 14. Two insertion holes 42 are arranged on the pin 41. The distance between the second insertion hole 42 and the bottom of the pin 41 is equal to the distance between the inner boom body 11 and the bottom plate 12. The distance between the first insertion hole 42 and the bottom of the pin 41 is greater than the distance between the inner boom body 11 and the middle plate 21. The snap ring pin 43 is set on one of the two insertion holes 42. Thus, when the snap ring pin 43 is inserted into the uppermost first insertion hole 42, the pin 41 passes through the second locking hole 14 and the first locking hole 22 in sequence, locking the inner boom 1 inside the outer boom 2. When the snap ring pin 43 is inserted into the lower second insertion hole 42, the pin 41 passes through the second locking hole 14, and the inner boom 1 and the outer boom 2 are unlocked.

[0040] Furthermore, in the telescopic boom with lubrication function of this utility model, the limiting component 6 includes a first limiting block 61 and a second limiting block 62. The first limiting block 61 is welded to the front end of the intermediate plate 21, and the second limiting block 62 is welded to the end of the bottom plate 12. The first limiting block 61 and the second limiting block 62 overlap each other, thereby effectively ensuring the extension range of the inner boom 1 when it extends into the outer boom 2, and avoiding damage to the oil cylinder 3.

[0041] Furthermore, in the telescopic boom with lubrication function of this utility model, the adjusting component 7 includes an adjusting bolt 71, a locking nut 72, and a protective plate 73. The locking nut 72 is threadedly engaged with the middle of the adjusting bolt 71, the adjusting bolt 71 is threadedly engaged with the threaded seat 24, the protective plate 73 is fixed to the second wear-resistant block 54, and the front end of the adjusting bolt 71 abuts against the protective plate 73. By controlling the screwing length of the adjusting bolt 71, the fit clearance between the second wear-resistant block 54 and the guide rail 13 is adjusted, thereby ensuring the tightness between the inner boom 1 and the outer boom 2.

[0042] Furthermore, in the telescopic boom with lubrication function of this utility model, the mounting end of the hydraulic cylinder 3 is hinged to the side plate 23 by a pin, and the output end of the hydraulic cylinder 3 is hinged to the inner boom body 11 by a pin, thereby ensuring the assembly and disassembly of the hydraulic cylinder 3.

[0043] Specifically, in use, first pull the snap ring pin 43 out of the first insertion hole 42 at the uppermost end of the pin 41, and pull the pin 41 to disengage it from the first locking hole 22. Then, insert the snap ring pin 43 into the second insertion hole 42 at the lower end to unlock the outer bucket rod 2 from the inner bucket rod 1. At this time, rotate the adjusting bolt 71. The adjusting bolt 71 presses against the protective plate 73, pushing the second wear-resistant block 54 to slide towards the guide rail 13, adjusting the tightness between the inner bucket rod 1 and the outer bucket rod 2 to an appropriate level. Then, tighten the locking nut 72 to lock the adjusting bolt 71. At this time, inject lubricating grease through the grease nipple 25, which enters the first oil pipe 53 and the second oil pipe 55 respectively. At the same time, the first oil pipe 53 supplies grease to the first oil reservoir 521 through the first oil passage 522, so that... Grease is stored in the first oil reservoir 521. When the guide rail 13 slides along the first wear-resistant block 52 on the upper surface of the guide rail 13, the grease in the first oil reservoir 521 is evenly coated on the guide rail 13 to ensure lubrication and improve the service life of the first wear-resistant block 52. The second oil pipe 55 supplies grease to the second oil reservoir 541 through the second oil passage 542, so that the grease is stored in the second oil reservoir 541. When the guide rail 13 slides along the second wear-resistant block 54 on the upper surface of the guide rail 13, the grease in the second oil reservoir 541 is evenly coated on the guide rail 13 to ensure lubrication and improve the service life of the second wear-resistant block 54. When the inner bucket rod 1 extends to the maximum extension length of the oil cylinder 3, the second limit block 62 abuts against the first limit block 61 to limit the extension length of the inner bucket rod 1 and avoid damage to the oil cylinder 3.

[0044] In summary, compared with the prior art, the telescopic pole with lubrication function of this utility model has the following advantages and beneficial effects:

[0045] This invention effectively improves the lubrication effect of the wear-resistant block by setting up an oil passage and an oil storage tank, reducing the lubrication cycle and extending the service life of the wear-resistant block and guide rail. By setting up a locking component, the inner bucket rod and outer bucket rod are mechanically locked, avoiding the problem of the inner bucket rod coming out when the cylinder is depressurized. By setting up a limiting component, the service life of the cylinder is effectively improved, and damage to the cylinder is avoided by extending the cylinder too far. By setting up an adjustment component, smooth extension and retraction of the inner bucket rod is ensured.

[0046] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A telescopic boom with lubrication function, characterized in that, The telescopic boom with lubrication function includes an inner boom, an outer boom, a hydraulic cylinder, a locking assembly, a sliding assembly, a limiting assembly, and an adjusting assembly. The inner boom is telescopically mounted inside the outer boom via the hydraulic cylinder. The locking assembly passes through the inner boom and the outer boom and is used to lock the inner boom and the outer boom together. The sliding assembly is located on both sides between the inner boom and the outer boom and is used for lubrication and sliding between the inner boom and the outer boom. The limiting assembly is located between the inner boom and the outer boom and is used to limit the extension distance of the inner boom. The adjusting assembly is located on both sides of the outer boom and is used to adjust the tightness between the inner boom and the outer boom. The sliding assembly includes a wear-resistant plate mounting base, a first wear-resistant block, a first oil pipe, a second wear-resistant block, and a second oil pipe. The wear-resistant plate mounting base is symmetrically welded to both sides of the inner side of the outer bucket rod. The first wear-resistant block is disposed between the inner bucket rod and the wear-resistant plate mounting base. The first oil pipe is disposed within the wear-resistant plate mounting base to lubricate the first wear-resistant block. The second wear-resistant block is disposed on both sides of the inner side of the outer bucket rod and is slidably connected to the inner bucket rod. The second oil pipe is disposed within the outer bucket rod to lubricate the second wear-resistant block.

2. The telescopic boom with lubrication function according to claim 1, characterized in that, The outer boom includes a middle plate, side plates, threaded seats, and grease nipples. The side plates are symmetrically welded to both sides of the middle plate. The threaded seats are symmetrically arranged in the middle of the side plates. The grease nipples are arranged on the side plates near the threaded seats. One end of the first oil pipe and the second oil pipe are respectively connected to the grease nipples. A first locking hole is provided through the middle plate.

3. The telescopic boom with lubrication function according to claim 2, characterized in that, The inner bucket rod includes an inner bucket rod body, a base plate, and a guide rail. The base plate is welded to the bottom of the inner bucket rod body, and the guide rail extends to both sides of the base plate. The guide rail and the base plate are integrally formed. One side of the guide rail is inclined. A second locking hole is provided through the inner bucket rod body and the guide rail.

4. The telescopic boom with lubrication function according to claim 3, characterized in that, The first wear-resistant block is rectangular in shape. A first oil reservoir is provided on the lower surface of the first wear-resistant block. A first oil passage is provided through the middle of the first wear-resistant block. The first oil reservoir is connected to the first oil passage. The other end of the first oil pipe is connected to the first oil passage. The first wear-resistant block is fixedly connected to the wear-resistant plate mounting base. The lower surface of the first wear-resistant block is slidably connected to the upper surface of the guide rail.

5. The telescopic boom with lubrication function according to claim 3, characterized in that, The second wear-resistant block is arranged in a right-angled triangle shape. A second oil reservoir is provided on the hypotenuse of the second wear-resistant block. A second oil passage is provided through the middle of the second wear-resistant block. The second oil reservoir is connected to the second oil passage. The other end of the second oil pipe is connected to the second oil passage. The hypotenuse of the second wear-resistant block matches the inclined surface of the guide rail. The hypotenuse of the second wear-resistant block is slidably connected to the guide rail. The bottom of the second wear-resistant block is slidably connected to the intermediate plate.

6. The telescopic boom with lubrication function according to claim 3, characterized in that, The locking assembly includes a pin and a snap ring pin. The pin is matched with the first locking hole and the second locking hole. Two insertion holes are arranged on the pin. The distance between the second insertion hole and the bottom of the pin is equal to the distance between the inner bucket rod body and the bottom plate. The distance between the first insertion hole and the bottom of the pin is greater than the distance between the inner bucket rod body and the middle plate. The snap ring pin is disposed on one of the two insertion holes.

7. The telescopic boom with lubrication function according to claim 3, characterized in that, The limiting component includes a first limiting block and a second limiting block. The first limiting block is welded to the front end of the intermediate plate, and the second limiting block is welded to the end of the bottom plate. The first limiting block and the second limiting block overlap each other.

8. The telescopic boom with lubrication function according to claim 3, characterized in that, The adjustment assembly includes an adjustment bolt, a lock nut, and a protective plate. The lock nut engages with the threaded portion of the adjustment bolt, the adjustment bolt engages with the threaded seat, the protective plate is fixed to the second wear-resistant block, and the front end of the adjustment bolt abuts against the protective plate.

9. The telescopic boom with lubrication function according to claim 3, characterized in that, The cylinder mounting end is hinged to the side plate via a pin, and the cylinder output end is hinged to the inner bucket rod body via a pin.

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