CN212405310U - Bucket rod assembly and excavator - Google Patents

Abstract

The utility model relates to an excavator field, in particular to bucket rod subassembly and excavator. The utility model provides a dipper assembly, include: the bucket rod comprises a body part and a first hinge part, the body part comprises an upper sealing plate and two side plates connected to two opposite sides of the upper sealing plate, and the first hinge part is arranged at the first end of the body part and is used for being connected with the bucket; the centralized lubricating system is arranged on the bucket rod and comprises a first lubricating pipe, a first lubricating joint and a protective block, wherein the first lubricating joint is communicated with a lubricating oil supply source through the first lubricating pipe and is communicated with the first hinge part through the protective block; wherein, first lubricated pipe sets up on last shrouding, and protection piece and first lubricated joint set up between the axial both ends of first articulated portion, and the protection piece is kept away from the second end relative with first end of this somatic part for first lubricated joint. The utility model discloses can realize the centralized lubrication of the first articulated portion that is used for being connected with the scraper bowl of dipper based on simpler structure.

Description

Bucket rod assembly and excavator

Technical Field

The utility model relates to an excavator field, in particular to bucket rod subassembly and excavator.

Background

The bucket rod is an important working mechanism of the excavator, and a plurality of hinged parts are arranged on the bucket rod and used for realizing the hinging of the bucket rod with a movable arm, a bucket, an oil cylinder and the like. These hinges need to be lubricated for flexibility of rotation, reduced wear and reduced noise. The hinge of the arm for hinging with the bucket is referred to as a first hinge.

The first hinge part is close to the bucket, so that the first hinge part is inevitably contacted with an excavated object and the like in the construction process, in this case, the concentrated lubrication mode is difficult to adopt for the first hinge part, because the lubrication joint corresponding to the first hinge part needs to be additionally protected when the concentrated lubrication mode is adopted, but no simple and effective protection means exists at present.

In view of the above, in the related art, the first hinge portion is generally lubricated by a single-point manual filling method, but such a lubrication method is long in maintenance time and prone to leakage filling.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a technical problem who solves does: the centralized lubrication of the first hinge portion of the stick for connection with the bucket is achieved based on a simpler structure.

In order to solve the technical problem, the utility model provides a bucket rod assembly, it includes:

the bucket rod comprises a body part and a first hinge part, the body part comprises an upper sealing plate and two side plates connected to two opposite sides of the upper sealing plate, and the first hinge part is arranged at the first end of the body part and is used for being connected with the bucket; and

the centralized lubricating system is arranged on the bucket rod and comprises a first lubricating pipe, a first lubricating joint and a protective block, wherein the first lubricating joint is communicated with a lubricating oil supply source through the first lubricating pipe and is communicated with the first hinge part through the protective block;

wherein, first lubricated pipe sets up on last shrouding, and protection piece and first lubricated joint set up between the axial both ends of first articulated portion, and the protection piece is kept away from the second end relative with first end of this somatic part for first lubricated joint.

In some embodiments, the protection block is provided with a threaded hole and a communication hole, the protection block is in threaded connection with the first lubricating joint through the threaded hole, and the communication hole is communicated with the threaded hole and the first hinge portion.

In some embodiments, an axis of the communication hole is in a radial direction of the first hinge portion, and an axis of the threaded hole intersects with an axis of the communication hole.

In some embodiments, the surface of the guard block for contact with the first lubricated joint is planar.

In some embodiments, a surface of the guard block facing the first lubrication fitting is provided with a groove, the groove being in contact with the first lubrication fitting.

In some embodiments, the guard block is welded to the first hinge.

In some embodiments, the protective block is provided with a groove.

In some embodiments, the surface of the guard block for contact with the first hinge is arcuate.

In some embodiments, the first hinge includes a first tube and two second tubes, the first tube coaxially connected between the two second tubes, the first lubricated joint and the guard block disposed on the first tube.

The utility model provides an excavator, include the utility model discloses a dipper subassembly.

The utility model discloses the protection piece that sets up can realize the protection to the corresponding first lubricated joint with first articulated portion based on simpler structure for can conveniently concentrate the lubrication to the first articulated portion that is used for being connected with the scraper bowl of dipper.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 shows a schematic view of a partial structure of an excavator according to some embodiments of the present invention.

FIG. 2 shows an enlarged partial schematic view of FIG. 1 at the location of the concentrated stick.

Fig. 3 shows a partially enlarged schematic view of fig. 1 at a first hinge.

Fig. 4 shows a partially enlarged schematic view of fig. 3 at the guard block.

Fig. 5 shows a perspective view of the guard block.

Fig. 6 shows a cross-sectional view of the guard block.

In the figure:

100. an excavator;

10. a dipper assembly;

1. a bucket rod; 11. a body portion; 111. an upper sealing plate; 112. a side plate; 12. a first hinge portion; 121. a first tube; 122. a second tube; 13. a second hinge portion; 14. a third hinge; 15. a fourth hinge portion;

2. a centralized lubrication system 21, centralized lubrication blocks; 22. a first lubrication tube; 23. lubricating the joint; 24. a protection block; 241. a threaded hole; 242. a communicating hole; 243. a groove; 244. welding a groove; 25. a second lubrication tube; 26. a third lubrication tube; 27. a fourth lubrication tube; 28. an oil cup; 29. a pipe joint;

3. a bucket rod cylinder;

4. a movable arm;

5. and a bucket cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary skilled person in the art without developing the creative work belong to the protection scope of the present invention.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In the description of the present invention, it should be understood that the terms "first", "second", etc. are used to define the components, and are only used for the convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, should not be interpreted as limiting the scope of the present invention.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated as "front, rear, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are all defined based on the directions or positional relationships when the excavator is traveling, wherein the direction of advance of the excavator is taken as the front, and the directions facing the direction of advance of the excavator are taken as the definitions of "rear", "left" and "right"; the terms "inner" and "outer" refer to the interior and exterior of the respective component as they relate to their own profile.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Fig. 1-6 schematically illustrate an excavator and stick assembly of the present invention.

The excavator 100 is a construction machine widely used in a construction process, and includes an arm 1, a boom 4, a bucket (not shown), and the like, and performs excavation of an object to be excavated, such as soil, gravel, or material, above or below a bearing surface in cooperation with the arm 1, the boom 4, the bucket, and the like.

The arm 1 connects the boom 4 and the bucket, and is an important work mechanism of the excavator 100.

Referring to fig. 1, 3, and 4, the arm 1 includes a body portion 11. The body portion 11 includes an upper cover plate 111 and two side plates 112, and the two side plates 112 are connected to opposite sides of the upper cover plate 111. The main body 11 further includes a lower sealing plate (not shown) which is spaced apart from the upper sealing plate 111 and connected to both side plates 112, so that the main body 11 is formed in a box-shaped structure as a whole.

The body portion 11 is connected to the bucket and arm cylinder 3 through first and second opposite ends thereof, respectively. The first end and the second end of the body portion 11 may also be referred to as a front end and a rear end of the body portion 11. Referring to fig. 1, a first end of the body 11 is provided with a first hinge 12, and the first hinge 12 is used for being hinged with a bucket to realize the rotary connection between the arm 1 and the bucket. Meanwhile, a second hinged portion 13 is arranged at the second end of the body portion 11, and the second hinged portion 13 is used for being hinged to the arm cylinder 3 to achieve driving connection of the arm cylinder 3 and the arm 1, so that the arm cylinder 3 can drive the arm 1 to pitch when stretching.

The first hinge portion 12 may be an integral structure, such as an integral cast tube, or the first hinge portion 12 may also be a split structure, and different portions are connected by welding or the like. For example, referring to fig. 3 and 4, in some embodiments, first articulating portion 12 includes a first tube 121 and two second tubes 122, with first tube 121 coaxially connected between the two second tubes 122. Specifically, the first tube 121 is welded between two second tubes 122. And the second tube 122 is a forging.

Referring to fig. 2, another hinge portion such as a third hinge portion 14 and a fourth hinge portion 15 is provided between the first end and the second end of the main body portion 11. The third hinge part 14 and the fourth hinge part 15 are respectively used for being hinged with the movable arm 4 and the bucket cylinder 5 so as to respectively realize the hinging of the arm 1 with the movable arm 4 and the bucket cylinder 5. Wherein, the bucket cylinder 5 is connected with the bucket drive for driving the bucket to pitch.

As can be seen, the arm 1 is provided with a plurality of hinge portions such as a first hinge portion 12, a second hinge portion 13, a third hinge portion 14, and a fourth hinge portion 15. These hinge portions require frequent lubrication to increase rotational flexibility, improve operational reliability, reduce wear, and reduce noise.

Centralized lubrication and single point lubrication are two important ways of lubrication. The centralized lubrication is a lubrication mode which provides a proper amount of lubricant to each lubrication point in a centralized manner. Single-point lubrication is a way of lubricating each lubrication point individually.

Since the plurality of lubrication points are collectively lubricated, the collective lubrication system can efficiently and reliably lubricate the plurality of lubrication points at regular time and quantity.

Compared with a centralized lubrication mode, the single-point lubrication requires longer maintenance time, the problem of filling leakage is easy to occur, the filling leakage easily causes abnormal abrasion, corrosion, abnormal sound and the like of a position to be filled in the leakage mode, and the service life and the working reliability of the structural component are influenced.

Although the centralized lubrication method has many advantages such as convenience, high efficiency, reliability and low labor cost compared with the single-point lubrication method, in some cases, due to the limitation of working conditions, structural forms and the like, some lubrication points are difficult to lubricate in the centralized lubrication method.

For example, in the case where the first hinge portion 12 of the arm 1 is located at the front end of the arm 1 and is close to the bucket, and inevitably comes into contact with the object to be excavated during construction, if the first hinge portion 12 is lubricated by the centralized lubrication system, the lubrication joint of the centralized lubrication system at the first hinge portion 12 needs to be additionally protected to prevent the lubrication joint from being damaged by the impact of the object to be excavated, but at present, there is no simple and effective protection means, and therefore, in the related art, the first hinge portion 12 is generally lubricated directly by the single-point lubrication method, and the centralized lubrication method is not adopted.

In order to the above situation, the utility model discloses set up the centralized lubrication system 2 that has protection piece 24 on dipper 1 for can realize the centralized lubrication to first articulated portion 12 based on simpler structure, with practice thrift maintenance time, reduce the filling leakage risk.

The utility model provides a dipper assembly 10 includes dipper 1 and centralized lubrication system 2 etc. Since some description has been given above on the arm 1, the following description will be given mainly on the centralized lubrication system 2.

Referring to fig. 1 to 6, a centralized lubrication system 2 is provided on the arm 1, and centrally lubricates a plurality of hinge portions including the first hinge portion 12 of the arm 1.

For example, in some embodiments, the centralized lubrication system 2 simultaneously lubricates the first hinge 12, the second hinge 13, the third hinge 14, the fourth hinge 15, and so on. At this time, the centralized lubrication system 2 includes not only the first lubrication pipe 22 and the first lubrication joint 23 corresponding to the first hinge portion 12, but also the second lubrication pipe 25 and the second lubrication joint (not shown) corresponding to the second hinge portion 13, the third lubrication pipe 26 and the third lubrication joint (not shown) corresponding to the third hinge portion 14, and the fourth lubrication pipe 27 and the fourth lubrication joint (not shown) corresponding to the fourth hinge portion 15.

The first lubricating pipe 22 and the first lubricating joint 23 are communicated with the lubricating oil supply source and the first hinge portion 12, so that the lubricating oil supply source is communicated with the first hinge portion 12 sequentially through the first lubricating pipe 22 and the first lubricating joint 23, lubricating grease is filled at the first hinge portion 12, lubrication of the first hinge portion 12 is achieved, and rotation flexibility between the arm 1 and the bucket is improved.

The second lubricating pipe 25 and the second lubricating joint are communicated with the lubricating oil supply source and the second hinge portion 13, so that the lubricating oil supply source is communicated with the second hinge portion 13 sequentially through the second lubricating pipe 25 and the second lubricating joint, lubricating grease is filled at the second hinge portion 13, lubrication of the second hinge portion 13 is achieved, and rotation flexibility between the arm 1 and the arm cylinder 3 is improved.

The third lubrication pipe 26 and the third lubrication joint communicate the lubrication oil supply source with the third hinge portion 14, so that the lubrication oil supply source is communicated with the third hinge portion 14 sequentially through the third lubrication pipe 26 and the third lubrication joint, lubrication grease is filled at the third hinge portion 14, lubrication at the third hinge portion 14 is achieved, and rotation flexibility between the arm 1 and the movable arm 4 is improved.

The fourth lubricating pipe 27 and the fourth lubricating joint are communicated with the lubricating oil supply source and the fourth hinging part 15, so that the lubricating oil supply source is communicated with the fourth hinging part 15 sequentially through the fourth lubricating pipe 27 and the fourth lubricating joint, lubricating grease is filled at the fourth hinging part 15, lubrication of the fourth hinging part 15 is achieved, and the rotation flexibility between the arm 1 and the bucket cylinder 5 is improved.

Referring to fig. 1 and 2, in some embodiments, the centralized lubrication system 2 is a manual centralized lubrication system that includes a centralized stick 21, the centralized stick 21 providing communication between a supply of lubrication oil and each of the branch lubrication pipes.

For example, referring to FIG. 2, in some embodiments, the lubricant supply is a cup 28, the cup 28 being disposed on the centralized stick 21 for grease injection. Also, a pipe joint 29 is provided on the collective grease stick 21, the pipe joint 29 and the grease cup 28 are disposed on opposite sides of the collective grease stick 21 and communicate with each other through oil passages inside the collective grease stick 21, and the pipe joint 29 communicates with the branch grease pipes, so that the grease injected through the grease cup 28 can flow to the respective branch grease pipes, such as the first grease pipe 22 and the second grease pipe 25, via the collective grease stick 21 and the pipe joint 29.

Specifically, referring to fig. 2, in some embodiments, 4 pipe joints 29 are provided on the centralized lubrication block 21, and the four pipe joints 29 communicate with the first, second, third, and fourth lubrication pipes 22, 25, 26, and 27, respectively, to direct grease to the first, second, third, and fourth hinge portions 12, 13, 14, and 15, respectively. Furthermore, 4 oil cups 28 are provided on the collective lubrication block 21, and the four oil cups 28 are communicated with the 4 pipe joints 29 in a one-to-one correspondence manner, so that grease is supplied to the first hinge portion 12, the second hinge portion 13, the third hinge portion 14, and the fourth hinge portion 15 by the four oil cups 28, respectively.

Although not shown, in other embodiments, the centralized lubrication system 2 may be an automatic centralized lubrication system, and in this case, it includes a filling pump and a distributor, and the filling pump is communicated with each branch lubrication pipe such as the first lubrication pipe 22, the second lubrication pipe 25, the third lubrication pipe 26, and the fourth lubrication pipe 27 through the distributor, so that the filling pump can pump the lubricating grease of the lubricating grease supply source to the distributor and provide the lubricating grease to each hinge portion through the distributor.

The branched lubrication pipes such as the first lubrication pipe 22, the second lubrication pipe 25, the third lubrication pipe 26, and the fourth lubrication pipe 27 may be flexible pipes or hard pipes.

The following description will focus on the lubrication implementation of the first articulating portion 12.

Referring to fig. 1-6, in some embodiments, centralized lubrication system 2 further includes a guard block 24, where guard block 24 communicates first lubrication fitting 23 with first articulating portion 12, where first lubrication fitting 23 communicates with the lubrication oil supply on the one hand via first lubrication tube 22 and also communicates with first articulating portion 12 via guard block 23. The first lubrication pipe 22 is disposed on the upper sealing plate 111. A guard block 24 and a first lubricated joint 23 are disposed between the axial ends of the first articulating portion 12. Also, the guard block 24 is located at a second end of the body portion 11 away from the first lubricating joint 23, that is, the guard block 24 is located on the front side of the first lubricating joint 23.

The protection block 24 that sets up in first lubricated joint 23 front side plays the effect of intercommunication first lubricated joint 23 and first articulated portion 12 on the one hand for the lubricating grease who reaches first lubricated joint 23 department can get into first articulated portion 12 inside through protection block 24 smoothly, lubricate the structure in first articulated portion 12, on the other hand protection block 24 still forms sheltering from first lubricated joint 23, can prevent to be excavated the thing in the work progress and etc. impact or collide first lubricated joint 23, play effectual guard action to first lubricated joint 23.

The first lubricating joint 23 and the protective block 24 are arranged between the two axial ends of the first hinge part 12, so that lubricating grease can enter the first hinge part 12 from a position between the two axial ends of the first hinge part 12 and flow to the two axial ends of the first hinge part 12, and the whole first hinge part 12 is sufficiently lubricated.

Further, the provision of the first lubricating nipple 23 and the guard block 24 between the axial ends of the first hinge portion 12 also makes it possible to provide the first lubricating tube 22 on the upper closure plate 111. For example, referring to fig. 1-3, in some embodiments, the first lubrication joint 23 and the protection block 24 are disposed on the first tube 121, and the first lubrication joint 23 and the protection block 24 are located at the axial middle portion of the first hinge portion 12, in which case the first lubrication tube 22 is disposed on the upper sealing plate 111, and no bending is required to achieve communication with the first lubrication joint 23. And first lubricated pipe 22 direct arrangement is on last shrouding 111, arranges the condition on curb plate 112 for first lubricated pipe 22, and first lubricated pipe 22 is more difficult to by wearing and tearing or collide with, from an angle, this is favorable to prolonging the life of first lubricated pipe 22, simultaneously, from another angle, this also is favorable to reducing the protection degree of difficulty of first lubricated pipe 22, makes first lubricated pipe 22 can avoid the protection even, effectively simplifies the structure.

When the first lubricating tube 22 is disposed on the upper sealing plate 111, if the centralized lubricating system 2 is a manual centralized lubricating system, the centralized lubricating block 21 can also be disposed on the upper sealing plate 111, which is also beneficial to reducing the wear risk and the protection difficulty of the centralized lubricating block 21.

It can be seen that the protection block 24 is a protection element with a simple structure and a significant protection effect, and can reliably protect the first lubrication joint 23 and the first lubrication pipe 22 without a complex structure, and effectively ensure the safety of the first lubrication joint 23 and the first lubrication pipe 22, so as to eliminate the obstacle that the first hinge portion 12 is difficult to adopt a centralized lubrication manner, so that the centralized lubrication manner of the first hinge portion 12 becomes possible, so that the first hinge portion 12 can be conveniently and centrally filled with lubricating grease only based on a simpler structure, effectively shorten the filling time of the lubricating grease, and simultaneously reduce the risk of leakage filling, so as to avoid the problems of abnormal wear, rusting, abnormal noise and the like of a shaft or a bearing and the like at the first hinge portion 12 due to the leakage filling.

With reference to fig. 4, in some embodiments, the protective block 24 is sized larger than the first lubrication fitting 23 for better protection. Specifically, the height of the guard block 24 is larger than the height of the first lubricating nipple 23, and the cross-sectional area (cross-section perpendicular to the height direction) of the guard block 24 is larger than the cross-sectional area of the first lubricating nipple 23. In this way, the first lubricating joint 23 can be shielded more sufficiently by the protective block 24, so that the first lubricating joint 23 can be protected more effectively. The protection block 24 may be configured in various shapes such as a cylinder.

In order to enable the protection block 24 to communicate with the first lubrication joint 23 and the first hinge portion 12, referring to fig. 4 to 6, in some embodiments, a threaded hole 241 and a communication hole 242 are provided on the protection block 24, the protection block 24 is screwed with the first lubrication joint 23 through the threaded hole 241, and the communication hole 242 communicates the threaded hole 241 with the first hinge portion 12. Therefore, the first lubricating joint 23 can be communicated with the first hinging part 12 only by screwing the first lubricating joint 23 into the threaded hole 241, and the structure is simple and the operation is convenient. Moreover, since the lubrication joint generally has a thread, the provision of the threaded hole 241 on the protection block 24 to threadedly connect the first lubrication joint 23 and the protection block 24 also allows the conventional lubrication joint to be directly utilized as the first lubrication joint 23, reducing the improvement cost.

The orientation and structure of the communication holes 242 can be designed according to actual conditions. For example, referring to fig. 4-6, in some embodiments, the axis of the communication hole 242 is along the radial direction of the first hinge portion 12, and the axis of the threaded hole 241 intersects with the axis of the communication hole 242, in which case the structure and machining of the threaded hole 241 and the communication hole 242 are simple, and the flow path of grease in the shielding block 24 is short, facilitating more efficient completion of grease filling.

With continued reference to fig. 4-6, in some embodiments, the surface of the guard block 24 for contact with the first lubrication joint 23 is planar. The protection block 24 in this case, which is more suitable for the first lubrication joint 23 whose surface contacting with the protection block 24 is also planar, enables a larger contact area between the protection block 24 and the first lubrication joint 23, thereby facilitating a tighter and firmer connection between the protection block 24 and the first lubrication joint 23.

For example, referring to fig. 5 and 6, in some embodiments, the surface of the guard block 24 facing the first lubrication fitting 23 is provided with a groove 243, the groove 243 being in contact with the first lubrication fitting 23. The side walls and bottom wall of the groove 243 are both planar. By providing the groove 243, even in the case where the surface of the protector block 24 facing the first lubricating joint 23 is a non-planar surface such as an arc surface, for example, in the case where the protector block 24 is cylindrical as shown in fig. 5, the protector block 24 can be brought into planar contact with the first lubricating joint 23 by the groove 243.

To achieve sufficient contact of the protective block 24 with the first hinge 23, and referring to fig. 4 and 6, in some embodiments, the surface of the protective block 24 that is intended to contact the first hinge 12 is arcuate. Because the surface between the axial both ends of first articulated portion 12 is the arc, consequently, set up the surface that is used for with first articulated portion 12 contact of protection piece 24 into the arc, can realize the more abundant contact of protection piece 24 and first articulated portion 23, be convenient for realize the more steady firm connection of protection piece 24 and first articulated portion 23.

The connection between the protective block 24 and the first hinge 23 can be varied. For example, in some embodiments, the guard block 24 is welded to the first hinge portion 12. At this time, in order to facilitate welding the protection block 24 to the first hinge portion 12, referring to fig. 5 to 6, in some embodiments, the protection block 24 is further provided with a groove 244.

To sum up, the utility model discloses a dipper subassembly 10 need not to do too much protection, can ensure the safety of lubricated pipeline and lubricated joint, simple structure, and the cost is lower for can conveniently realize the centralized lubrication to first articulated portion 12, thereby effectively shorten lubricating grease filling time, reduce the filling risk of leaking, make excavator 100 can implement the excavation operation more nimble reliably.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention, and all the parameters should be included in the protection scope of the present invention.

Claims (10)

1. A bucket assembly (10), comprising:

the bucket rod (1) comprises a body part (11) and a first hinge part (12), wherein the body part (11) comprises an upper sealing plate (111) and two side plates (112) connected to two opposite sides of the upper sealing plate (111), and the first hinge part (12) is arranged at a first end of the body part (11) and is used for being connected with a bucket; and

the centralized lubricating system (2) is arranged on the bucket rod (1) and comprises a first lubricating pipe (22), a first lubricating joint (23) and a protective block (24), wherein the first lubricating joint (23) is communicated with a lubricating oil supply source through the first lubricating pipe (22) and is communicated with the first hinge part (12) through the protective block (24);

wherein the first lubricating pipe (22) is arranged on the upper sealing plate (111), the protection block (24) and the first lubricating joint (23) are arranged between two axial ends of the first hinge part (12), and the protection block (24) is far away from a second end, opposite to the first end, of the body part (11) relative to the first lubricating joint (23).

2. The stick assembly (10) of claim 1, wherein the protective block (24) is provided with a threaded hole (241) and a communication hole (242), the protective block (24) is in threaded connection with the first lubrication joint (23) through the threaded hole (241), and the communication hole (242) communicates the threaded hole (241) with the first hinge portion (12).

3. The stick assembly (10) of claim 2, wherein an axis of the communication hole (242) is radial to the first hinge (12), and an axis of the threaded hole (241) intersects the axis of the communication hole (242).

4. The stick assembly (10) of claim 2, wherein the surface of the guard block (24) for contact with the first lubrication fitting (23) is planar.

5. The stick assembly (10) of claim 4, wherein the surface of the guard block (24) facing the first lubricated joint (23) is provided with a groove (243), the groove (243) being in contact with the first lubricated joint (23).

6. The stick assembly (10) of claim 1, wherein the guard block (24) is welded to the first hinge (12).

7. The stick assembly (10) of claim 6, wherein the guard block (24) is provided with a bevel (244).

8. The stick assembly (10) of claim 1, wherein the surface of the guard block (24) for contact with the first hinge (12) is arcuate.

9. The stick assembly (10) of any of claims 1-8, wherein the first hinge (12) includes a first tube (121) and two second tubes (122), the first tube (121) being coaxially connected between the two second tubes (122), the first lubricated joint (23) and the guard block (24) being disposed on the first tube (121).

10. An excavator (100) comprising a stick assembly (10) as claimed in any one of claims 1 to 9.

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