Length-adjustable connecting rod structure and excavator

Abstract

The invention belongs to the technical field of engineering machinery, and relates to a length-adjustable connecting rod structure and an excavator. The length-adjustable connecting rod structure comprises two thread adjusting assemblies of the same structure, a first shaft seat and two second shaft seats, and one ends of the two thread adjusting assemblies are connected with two fixing rods symmetrically arranged on the first shaft seat through limiting devices; one end of the threaded adjusting assembly is in threaded connection with the first shaft seat, the other end of the threaded adjusting assembly is in threaded connection with lifting sleeves arranged on the two second shaft seats, the threaded adjusting assembly comprises two symmetrical semi-cylindrical external threaded sleeves, internal threads matched with the two semi-cylindrical external threaded sleeves are correspondingly arranged on the inner sides of the lifting sleeves, and a connecting rod is fixed between the lifting sleeves on the two second shaft seats; the length of the connecting rod structure is adjusted by rotating the two thread adjusting assemblies at the same time. The connecting rod has the function of adjusting the length of the connecting rod, the length of the connecting rod can be adjusted according to different inward-folding and outward-turning angle changes and four-connecting-rod transmission ratio changes of an assembled bucket or machine tool, and the requirements of different working conditions are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and relates to a length-adjustable connecting rod structure and an excavator, which can be used in engineering machinery industries such as excavators, and together with a rocker arm, a bucket and a bucket cylinder, form a four-link structure to achieve force transmission and the swinging motion of the bucket, thereby realizing functions such as excavation. Background Art

[0002] As a typical representative of construction machinery, excavators have a wide range of operations and complex working conditions. The connecting rod is the main structural component of the excavator working device. Together with the bucket, rocker, bucket cylinder and bucket or tool, it forms a front-end four-link structure to realize the outward and inward movement of the bucket or tool, and realize the normal excavation function or other tool functions. At present, the connecting rod of the traditional excavator is Figure 7 As shown, the length of the connecting rod is fixed, and the length of the connecting rod cannot be adjusted according to the change of the tumbling and retraction angle of the assembled bucket or machine, or the change of the four-bar transmission ratio.

[0003] Traditional excavators perform bucket digging or other attachment work mainly by using the bucket cylinder on the dipper arm to push the rocker, connecting rod, bucket and dipper arm to form a four-bar linkage ( Figure 8 ), perform bucket digging or other attachment work. When the working condition of the excavator changes or when different attachments are replaced and different requirements are placed on the connecting rod length, the traditional connecting rod structure cannot change the connecting rod length in time, and the excavator needs to replace the connecting rod, wasting a certain amount of production cost and labor cost and downtime cost during replacement.

[0004] The existing connecting rods are usually welded parts, and the length cannot be adjusted. When the bucket working condition or the excavator attachments are replaced, the angle of inward and outward rotation, or the transmission ratio of the four-link needs to be changed, the length of the connecting rod cannot be changed in time, which cannot meet customer needs. Or replacing different connecting rods requires a longer production cycle and causes waste of connecting rods. The product cannot adapt well to market demand, affecting the competitiveness of the product. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a length-adjustable connecting rod structure and an excavator. The connecting rod has the function of adjusting the length of the connecting rod. The length of the connecting rod can be adjusted according to the different inward and outward angles of the assembled bucket or machine and the changes in the four-bar transmission ratio to meet the needs of different working conditions. The structure adopts threaded connection and has good impact resistance. The adjustment structure adopts three-layer rotation and thread rotation, which can achieve stepless length adjustment and a symmetrical layout. The length change can be achieved by rotating the adjustment assembly at the same time, thereby realizing the self-locking function.

[0006] The technical solution provided by the present invention is as follows:

[0007] The present invention provides a length-adjustable connecting rod structure, comprising two threaded adjustment components with the same structure, an axle seat one and two axle seats two, one end of the two threaded adjustment components is connected to two fixing rods symmetrically arranged on the axle seat one through a limiting device, and the other end is threadedly connected to a lifting sleeve arranged on the two axle seats two, the threaded adjustment component comprises two mutually symmetrical semi-cylindrical externally threaded sleeves, the inner side of the lifting sleeve is correspondingly provided with an internal thread that cooperates with the two semi-cylindrical externally threaded sleeves, a connecting rod is fixed between the lifting sleeves on the two axle seats two, and the connecting rod structure realizes length adjustment by simultaneously rotating the two threaded adjustment components.

[0008] Furthermore, the fixing rod, the two semi-cylindrical externally threaded sleeves and the lifting sleeve form a two-level nested structure, and the fixing rod and the lifting sleeve are located at the innermost layer and the outermost layer respectively.

[0009] Furthermore, the limiting device includes a limiting protrusion structure provided on the outer surface of the fixing rod and a limiting groove structure provided on the inner sides of two semi-cylindrical externally threaded sleeves, and the limiting protrusion structure cooperates with the limiting groove structure to achieve axial limiting.

[0010] Furthermore, the limiting protrusion structure is a semicircular structure, a V-shaped structure or a T-shaped structure.

[0011] Furthermore, when the two semi-cylindrical externally threaded sleeves are assembled, the side close to the shaft seat 1 has a hexagonal head.

[0012] Furthermore, it also includes a lubrication assembly arranged on the fixed rod, the lubrication assembly includes a grease nipple arranged in the radial direction of the fixed rod and an oil channel in the axial direction, and the grease nipple is connected to the oil channel.

[0013] Furthermore, the lifting sleeve is a semi-solid structure.

[0014] The present invention further provides an excavator, comprising the above-mentioned length-adjustable connecting rod structure, wherein the first axle seat of the connecting rod structure is hinged to the bucket, and the second axle seat is hinged to the rocker.

[0015] Beneficial Effects

[0016] 1. The present invention can realize stepless adjustment of the connecting rod length through the threaded matching setting of the threaded adjustment component and the lifting sleeve, and has good impact resistance, and is suitable for use in the front-end impact condition of the excavator; the adjustment component is composed of a semi-open thread structure, which is convenient for assembly and processing, and has a simple structure. The length change can be achieved by rotating the adjustment component at the same time, realizing the self-locking function.

[0017] 2. The present invention adopts two threaded adjustment components to rotate simultaneously, which can realize the up and down translation of the connecting rod movable component, thereby realizing the length adjustment of the connecting rod structure; the double threaded adjustment components need to be adjusted at the same time to realize length adjustment and state maintenance, so this structure does not require other threaded locking mechanisms to be loosened; the lubricating oil hole is designed for the rotating part to ensure flexible rotation and improve the wear resistance of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall diagram of the connecting rod structure;

[0019] Figure 2 It is a schematic diagram of fixed components;

[0020] Figure 3 It is a schematic diagram of the active components;

[0021] Figure 4 It is a schematic diagram of the thread adjustment assembly;

[0022] Figure 5 It is a schematic diagram of a semi-cylindrical external threaded casing;

[0023] Figure 6 It is a schematic diagram of the fixing rod, oil passage and limit device;

[0024] Figure 7 It is a schematic diagram of an existing conventional connecting rod;

[0025] Figure 8 This is an existing conventional connecting rod assembly diagram (12, bucket arm; 13, bucket cylinder; 14, rocker arm; 15, connecting rod; 16, bucket).

[0026] Explanation of the accompanying drawings: 1. Fixed component; 2. Movable component; 3. Thread adjustment component; 4. Grease nipple; 5. Fixed rod; 6. Shaft seat 1; 7. Shaft seat 2; 8. Connecting rod; 9. Lifting sleeve; 10. Semi-cylindrical external threaded sleeve. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] Example 1

[0031] like Figure 1 As shown, an embodiment of the present invention provides a length-adjustable connecting rod structure, including two threaded adjustment components 3 with the same structure, an axle seat 1 6 and two axle seats 2 7, one end of the two threaded adjustment components 3 is connected to two fixing rods 5 symmetrically arranged on the axle seat 1 6 through a limiting device, and the other end is threadedly connected to a lifting sleeve 9 arranged on the two axle seats 2 7, the threaded adjustment component 3 includes two mutually symmetrical semi-cylindrical external threaded sleeves 10, the inner side of the lifting sleeve 9 is correspondingly provided with an internal thread that cooperates with the two semi-cylindrical external threaded sleeves 10, a connecting rod 8 is fixed between the lifting sleeves 9 on the two axle seats 2 7, and the connecting rod structure realizes length adjustment by simultaneously rotating the two threaded adjustment components 3.

[0032] In this embodiment, the threaded adjustment component and the lifting sleeve's threaded matching setting can realize stepless adjustment of the connecting rod length, and has good impact resistance. The adjustment component is composed of two symmetrical semi-cylindrical external threaded sleeves, which is convenient for assembly and processing and has a simple structure. The length can be changed by rotating the adjustment component at the same time, realizing the self-locking function.

[0033] Example 2

[0034] like Figure 1 As shown, the embodiment of the present invention provides a length-adjustable connecting rod structure, including a fixed component 1, a movable component 2 and two threaded adjustment components 3 with the same structure. The fixed component 1 is composed of two fixed rods 5 and an axle seat 6 ( Figure 2 ), the movable assembly 2 is composed of two shaft seats 7, a connecting rod 8, and two lifting sleeves 9 ( Figure 3 ), the lifting sleeve 9 has an internal thread on the inner side, the connecting rod 8 is fixed on the two lifting sleeves 9, one end of the two thread adjustment components 3 is connected to the two fixing rods 5 symmetrically arranged on the shaft seat 1 6 through a limit device, and the other end is threadedly connected to the lifting sleeve 9 arranged on the two shaft seats 2 7, such as Figure 4 and Figure 5 As shown, the thread adjustment component 3 is composed of two semi-cylindrical externally threaded sleeves 10, and a threaded structure is provided on the outside. The two semi-cylindrical externally threaded sleeves 10 are threadedly combined to form a normal full thread, which can be screwed into the internal thread on the inner side of the lifting sleeve 9. The two semi-cylindrical externally threaded sleeves 10 form a thread adjustment component 3 with a length adjustment structure. The limiting device around the fixed rod 5 can realize axial limiting during rotation. The lifting sleeve 9 is driven by the thread to realize lifting and lowering, thereby realizing the adjustment of the connecting rod length. At the same time, the internal thread of the lifting sleeve 9 is screwed into the external thread of the thread adjustment component 3 to complete the matching assembly of the two semi-cylindrical externally threaded sleeves 10 in the thread adjustment component 3 to realize the rotation action without separation.

[0035] In this embodiment, the fixing rod 5, two semi-cylindrical externally threaded sleeves 10 and the lifting sleeve 9 form a two-level nested structure, and the fixing rod 5 and the lifting sleeve 9 are located at the innermost layer and the outermost layer respectively.

[0036] In this embodiment, the limiting device includes a limiting protrusion structure provided on the outer surface of the fixing rod 5 and a limiting groove structure provided on the inner side of two semi-cylindrical externally threaded sleeves 10, and the limiting protrusion structure cooperates with the limiting groove structure to achieve axial limiting.

[0037] In this embodiment, the limiting protrusion structure on the fixing rod 5 can be a semicircular structure, or a V-shaped, T-shaped or other structure. One limit can be set, or multiple limit can be set to ensure the limiting effect.

[0038] In this embodiment, Figure 6 As shown, an oil channel is axially arranged inside the fixed rod 5, and a grease nipple 4 connected to the oil channel is radially arranged. During use, the grease nipple 4 and the oil channel inside the fixed rod 5 can be used to lubricate the limit device and the rotating part to ensure flexible movement of the adjustment structure.

[0039] In this embodiment, when two semi-cylindrical externally threaded sleeves 10 are assembled, the side close to the shaft seat 6 has a hexagonal head.

[0040] Specifically, during the length adjustment process, because the two lifting sleeves 9 are connected by the connecting rod 8 to form the movable component 2, it is necessary to use a wrench or other tools to simultaneously turn the hexagonal heads of the two threaded adjustment components 3 to realize the up and down movement of the movable component 2, thereby realizing the length change of the connecting rod. If they are loosened at the same time, they can only be loosened by the same amplitude. This simultaneous situation can effectively solve the side load and uneven force during the working process of the connecting rod. Therefore, this structure can realize the self-locking function of the thread.

[0041] In this embodiment, the lifting sleeve 9 is a semi-solid structure, which not only ensures the strength and stability of the lifting sleeve 9, but also reduces the weight, making the connecting rod structure lighter.

[0042] Example 3

[0043] An embodiment of the present invention provides an excavator, comprising the length-adjustable connecting rod structure of embodiment 1 or 2, wherein the axle seat 1 6 of the connecting rod structure is hinged to the bucket, and the axle seat 2 7 is hinged to the rocker.

[0044] The length-adjustable connecting rod structure of the present invention can also be applied to other equipment including but not limited to the field of engineering machinery, such as cranes, automobiles, agricultural machinery, etc.

[0045] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above-mentioned technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. A length-adjustable connecting rod structure, characterized in that: It includes two threaded adjustment components with the same structure, an axle seat one and two axle seats two. One end of the two threaded adjustment components is connected to two fixing rods symmetrically arranged on the axle seat one through a limiting device, and the other end is threadedly connected to a lifting sleeve arranged on the two axle seats two. The threaded adjustment component includes two mutually symmetrical semi-cylindrical externally threaded sleeves, and the inner side of the lifting sleeve is correspondingly provided with an internal thread that cooperates with the two semi-cylindrical externally threaded sleeves. A connecting rod is fixed between the lifting sleeves on the two axle seats two, and the connecting rod structure realizes length adjustment by simultaneously rotating the two threaded adjustment components.

2. The adjustable connecting rod structure according to claim 1, characterized in that: The fixing rod, two semi-cylindrical externally threaded sleeves and the lifting sleeve form a two-level nested structure, and the fixing rod and the lifting sleeve are respectively located at the innermost layer and the outermost layer.

3. The length-adjustable connecting rod structure according to claim 1 or 2, characterized in that: The limiting device comprises a limiting protrusion structure arranged on the outer surface of the fixing rod and a limiting groove structure arranged on the inner sides of two semi-cylindrical external threaded sleeves. The limiting protrusion structure cooperates with the limiting groove structure to achieve axial limiting.

4. The length-adjustable connecting rod structure according to claim 3, characterized in that: The limiting protrusion structure is a semicircular structure, a V-shaped structure or a T-shaped structure.

5. The length-adjustable connecting rod structure according to claim 1, characterized in that: When two semi-cylindrical external threaded sleeves are assembled, one side close to the shaft seat is provided with a hexagonal head.

6. The length-adjustable connecting rod structure according to claim 1, characterized in that: It also includes a lubrication assembly arranged on the fixed rod, the lubrication assembly includes a grease nipple arranged in the radial direction of the fixed rod and an oil channel in the axial direction, and the grease nipple is connected to the oil channel.

7. The length-adjustable connecting rod structure according to claim 1, characterized in that: The lifting sleeve is a semi-solid structure.

8. An excavator, characterized in that: It comprises the length-adjustable connecting rod structure as described in any one of claims 1 to 7, wherein the first axle seat of the connecting rod structure is hinged to the bucket, and the second axle seat is hinged to the rocker.

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