CN211596869U

CN211596869U - Connecting device applied to excavator and excavator

Info

Publication number: CN211596869U
Application number: CN202020028393.8U
Authority: CN
Inventors: 史志伟; 吕梁; 郭春林
Original assignee: Sany Heavy Machinery Ltd
Current assignee: Sany Heavy Machinery Ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-09-29
Anticipated expiration: 2030-01-07

Abstract

The utility model provides a be applied to connecting device and excavator of excavator, wherein, this connecting device includes: the pin shaft is used for connecting the bucket rod and the movable arm; the buffer piece is used for providing buffer force for the pin shaft; the bucket rod is inserted into the movable arm, and the pin shaft penetrates through the bucket rod and the movable arm, so that the bucket rod is rotatably connected with the movable arm; a baffle is arranged at the top of the pin shaft; the buffering force is parallel to the axis of the pin shaft and faces away from the baffle. The connecting device can prolong the service life of the pin shaft, effectively reduce the possibility of fatigue fracture of the baffle, and simultaneously ensure the reliability of connection between the bucket rod and the movable arm.

Description

Connecting device applied to excavator and excavator

Technical Field

The utility model relates to a mechanical connection technical field especially relates to a be applied to connecting device and excavator of excavator.

Background

The bucket rod of the excavator is rotatably connected with the movable arm through a pin shaft. In the working process, the gap between the arm and the pin shaft is gradually increased due to friction and the like, and the arm extrudes the pin shaft, so that the pin shaft is subjected to the action of the axial force and leaps in the axial direction.

Under the working condition of long-term excavation, the baffle on the pin shaft is deformed due to repeated impact of the bouncing force in the axial direction. Fatigue fractures of the panel occur when the deformation builds to a certain extent and exceeds the yield limit of the panel.

After the baffle breaks, the axial movable range of the pin shaft is not limited. If the operator cannot find the situation in time and continues to work, the pin shaft is likely to be disconnected under the action of the bouncing force in the axial direction, so that the connection between the movable arm and the bucket rod is failed, and great potential safety hazard and economic loss are brought.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a be applied to connecting device and excavator of excavator for solve the round pin axle that is used for connecting dipper and swing arm among the prior art, cracked problem appears easily because of receiving the impact of the power of leaping up in the axial to its baffle.

In order to solve the above problem, the utility model provides a: a coupling device applied to an excavator, comprising:

the pin shaft is used for connecting the bucket rod and the movable arm;

the buffer piece is used for providing buffer force for the pin shaft;

the bucket rod is inserted into the movable arm, and the pin shaft penetrates through the bucket rod and the movable arm, so that the bucket rod is rotatably connected with the movable arm;

a baffle is arranged at the top of the pin shaft;

the buffering force is parallel to the axis of the pin shaft and faces away from the baffle.

As a further improvement of the above technical solution, the buffer member has elasticity.

As a further improvement of the above technical solution, the buffer member includes a wave spring;

the wave spring is sleeved on the pin shaft.

As a further improvement of the above technical solution, the buffer member includes a compression spring;

the compression spring is sleeved on the pin shaft.

As a further improvement of the above technical solution, the buffer member includes an elastic ring;

the elastic ring is sleeved on the pin shaft.

As a further improvement of the above technical solution, the elastic ring includes any one of a rubber ring, a TPU ring, or an EVA ring.

As a further improvement of the above technical scheme, a gland is fixedly arranged at the bottom of the pin shaft;

the buffer piece is abutted to the gland.

As a further improvement of the above technical solution, a washer is sleeved on the pin shaft, and the washer is located between the gland and the movable arm;

the gasket with the gland respectively with the both ends looks butt of bolster.

As a further improvement of the technical scheme, the gland is fixedly connected with the pin shaft through a fixing bolt.

The utility model discloses still provide: an excavator comprising a coupling device as described above for use in an excavator.

The utility model has the advantages that: the utility model provides a be applied to connecting device of excavator, including round pin axle and buffer, wherein, realized the rotation between dipper and the swing arm through the round pin axle and connected. Under the action of the buffer piece, the pin shaft can be subjected to buffer force which is parallel to the axial lead of the pin shaft and faces away from the baffle, so that the baffle can be attached to the movable arm, and the movable space of the pin shaft is reduced.

When the pin shaft is subjected to the axial bouncing force, the buffering force provided by the buffering piece can offset part of the bouncing force, so that the stress of the baffle can be reduced, and the deformation degree of the baffle due to stress is reduced.

The connecting device can prolong the service life of the pin shaft, effectively reduce the possibility of fatigue fracture of the baffle, and simultaneously ensure the reliability of connection between the bucket rod and the movable arm.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 illustrates a partial cross-sectional view of a stick coupled to a boom;

FIG. 2 shows an enlarged view of a portion of the bottom of the pin of FIG. 1;

FIG. 3 shows an exploded view of the pin, bumper, gland and gasket of FIG. 1;

figure 4 shows a cross-sectional view of a gland;

figure 5 shows a cross-sectional view of a gasket.

Description of the main element symbols:

1-a bucket rod; 2-a movable arm; 3-a pin shaft; 4-a buffer member; 5-a baffle plate; 6-pressing the cover; 7-concave holes; 8-a flange; 9-fixing the bolt; 10-a gasket; 11-a washer; 12-a front fork; 13-a platen; 14-connecting bolts; 15-bottom hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Example one

An excavator is one of common engineering machines, and the requirement on the safety of the excavator is high. Once the connection of the movable part is broken down, the production accident is likely to be caused, and the harmfulness is extremely high.

In an excavator, an arm 1 and a boom 2 are main components, and mainly function to control operations of excavating, loading, and the like of an excavator bucket. The boom 1 and the boom 2 are movable members, and the reliability of the connection between the boom and the boom is important.

For this reason, in the present embodiment, a connection device applied to an excavator is proposed, which can realize connection between the arm 1 and the boom 2 and has advantages of high reliability, long service life, and the like.

Referring to fig. 1, a connecting device for an excavator includes a pin 3 and a buffer 4, in which the pin 3 is used to connect a dipper 1 and a boom 2, and the buffer 4 is used to provide a buffering force to the pin 3. For the sake of easy observation, only a part of the arm 1 and the boom 2 is shown in fig. 1, and hatching is not shown.

The arm 1 is inserted into the boom 2, and the arm 1 and the boom 2 are rotatably connected by a pin 3 passing through the arm 1 and the boom 2. Wherein, the dipper 1 is connected with the round pin axle 3 rotation.

The top of the pin shaft 3 is provided with a baffle 5. Wherein, the baffle 5 can be fixed on the top of the pin shaft 3 by welding or screw connection.

The cross sectional area of baffle 5 is greater than the cross sectional area in the shaft hole on dipper 1 and the swing arm 2, and like this, baffle 5 just can not stretch into in the shaft hole of dipper 1 and swing arm 2 to can restrict the home range at round pin 3 top.

The buffer 4 is used for providing buffer force to the pin shaft 3, is parallel to the axis of the pin shaft 3, and faces away from the baffle 5. Under the action of the buffer force, the baffle 5 can be attached to the movable arm 2, so that when the arm 1 and the movable arm 2 are in a standing state or slightly move, the pin shaft 3 cannot displace relative to the arm 1 and the movable arm 2 in the axial direction.

In the present embodiment, the buffer 4 has elasticity.

Preferably, the buffer 4 may employ a wave spring. Wherein, when installing, the ripples spring need be located round pin axle 3 on the cover.

The wave spring is called a wave spring, and is an elastic element with a plurality of peaks and valleys on a metal thin circular ring. The wave spring has the advantages of large rigidity range, strong buffering and vibration absorbing capacity, strong impact resistance, compact structure size, convenience in installation and the like.

To improve the damping force, a plurality of wave springs may be used. Superpose each other between the wave spring, wherein, the crest overlaps mutually with the crest, and the trough overlaps mutually with the trough. The adjacent wave springs can be fixedly connected through welding, bonding or other modes, so that the plurality of wave springs are integrally formed.

As shown in fig. 2, in order to facilitate installation of the buffer 4, a gland 6 may be fixedly disposed at the bottom of the pin 3, wherein the buffer 4 abuts against the gland 6.

The whole gland 6 is cylindrical, and the diameter of the gland is larger than the inner diameter of each shaft hole, so that the gland 6 cannot enter the shaft holes of the bucket rod 1 and the movable arm 2, and the movable range of the bottom of the pin shaft 3 can be limited.

In this embodiment, the baffle 5 is arranged at the top of the pin shaft 3, and the gland 6 is arranged at the bottom of the pin shaft 3, so that the axial moving range of the pin shaft 3 is limited, and the pin shaft 3 is prevented from being separated from the shaft hole to cause the failure of the connection between the bucket arm 1 and the movable arm 2.

It should be noted that the pin 3 is not completely fixed with respect to the boom 2 in the axial direction, but has a certain movement space. If the pin 3 is not movable in the axial direction with respect to the boom 2, the pin 3 may break when subjected to the bouncing force in the axial direction due to the inability of the bouncing force to achieve effective damping and release.

As shown in fig. 4, the pressing cover 6 may be provided with a concave hole 7 and a flange 8, and the flange 8 wraps the concave hole 7. The cross section of the concave hole 7 can be circular, and the cross section of the flange 8 can be circular, wherein the diameter of the concave hole 7 is equal to the inner diameter of the flange 8.

When the cushion member 4 is attached, the flange 8 abuts against the cushion member 4. When the pin shaft 3 is connected to the gland 6, the bottom of the pin shaft 3 is inserted into the concave hole 7.

As shown in fig. 2 and 3, the gland 6 may be fixedly connected to the pin 3 by a fixing bolt 9. Wherein, the gland 6 can be provided with the through-hole that is used for making fixing bolt 9 pass, and simultaneously, the bottom of round pin axle 3 can be provided with the corresponding screw hole of fixing bolt 9.

After the fixing bolt 9 penetrates through the gasket 10 and the through hole in the gland 6, the fixing bolt 9 is inserted into the threaded hole in the bottom of the pin shaft 3, and the gland 6 is fixedly connected with the pin shaft 3 by screwing the fixing bolt 9. For the connection reliability, the gland 6 and the pin 3 can be fixed by a plurality of fixing bolts 9.

In order to disperse and equalize the acting force of the buffer 4 on the movable arm 2, a washer 11 can be sleeved on the pin shaft 3, and the outer diameter of the washer 11 is larger than the inner diameter of each shaft hole. The gasket 11 is located between the gland 6 and the movable arm 2, wherein the gasket 11 and the gland 6 are respectively abutted against both ends of the buffer 4.

As shown in fig. 5, in the present embodiment, the bottom of the gasket 11 may be provided with a bottom hole 15. The inner diameter of the bottom hole 15 is larger than the outer diameter of the cushion member 4, and the inner diameter of the bottom hole 15 is also larger than the outer diameter of the flange 8.

As shown in fig. 2, 3 and 4, the cushion member 4 is partially located in the bottom hole 15, wherein the top end of the cushion member 4 abuts against the bottom surface of the bottom hole 15, and the bottom end of the cushion member 4 abuts against the top surface of the flange 8. When the axial urging force is large, the flange 8 may protrude into the bottom hole 15, and the cushion member 4 is pressed to be deformed more, thereby generating a larger cushion force and thus increasing the cushion effect.

Referring to fig. 1 and 2, when the excavator is in working rotation, the pin shaft 3 may be subjected to the bouncing force in the axial direction, and the direction of the bouncing force may be found to change along with the vibration of the excavator body, or vertically upward or vertically downward.

The following description will be made with the boom 2 as a reference system.

When the bouncing force is directed vertically upwards and the bouncing force is larger than the initial buffering force of the buffer 4, the pin shaft 3 will move upwards. As the pin 3 moves, the gland 6 at the bottom of the pin 3 moves toward the washer 11, and at this time, the buffer 4 between the gland 6 and the washer 11 is deformed by being pressed. The greater the deformation of the buffer 4, the greater the damping force generated, and correspondingly, the smaller the acceleration of the pin 3 until it is zero. Then, the pin 3 and the baffle 5 will return to the initial position under the action of the buffer force.

When the direction of the bouncing force is vertically downward, the baffle 5 is attached to the movable arm 2 under the action of the buffering force of the buffering member 4, so that the baffle 5 and the movable arm 2 do not move relatively to each other, and thus, no impact is generated between the baffle 5 and the movable arm 2.

In this embodiment, the connecting device has the following advantages:

1. the bouncing force on the pin shaft 3 can be buffered, so that the possibility of fatigue fracture of the baffle 5 is reduced, and the service life of the pin shaft 3 is prolonged;

2. the elastic buffer piece 4 can ensure that the pin shaft 3 can automatically reset to the initial position, so that the baffle 5 is attached to the movable arm 2, and the frequency of collision impact between the baffle 5 and the movable arm 2 is reduced;

3. the reliability of the connection between the arm 1 and the boom 2 can be improved.

As shown in fig. 1, the boom 2 includes two front forks 12 arranged in parallel, wherein the two front forks 12 may be provided with a space for accommodating the arm 1.

The two front forks 12 are provided with coaxial shaft holes, and the bucket rod 1 is also provided with a shaft hole. Wherein, the shaft holes of front fork 12 and dipper 1 all are used for installing round pin axle 3.

Because the bucket rod 1 is rotatably connected with the pin shaft 3, and the contact area between the bucket rod 1 and the pin shaft 3 is large, a shaft sleeve can be arranged in a shaft hole of the bucket rod 1 for protecting the bucket rod 1. Wherein, clearance fit is formed between the shaft sleeve and the pin shaft 3.

Referring to fig. 1 and 2, the assembly flow of the arm 1 and the boom 2 is substantially as follows:

the bucket rod 1 is inserted between the two front forks 12; adjusting the position of the bucket rod 1 to enable the bucket rod 1 and the shaft holes of the front fork 12 to be collinear; inserting the pin shaft 3 into the shaft hole; sleeving a gasket 11 on the bottom of the pin shaft 3, wherein a bottom hole 15 of the gasket 11 faces downwards; sleeving the buffer piece 4 on the pin shaft 3; a gland 6 is arranged at the bottom of the pin shaft 3; and installing a fixing bolt 9 and locking the fixing bolt 9, so that the gland 6 is fixedly connected with the pin shaft 3.

In the present embodiment, a pressure plate 13 may be further installed on the front fork 12 of the boom 2, wherein the pressure plate 13 may be attached to the baffle 5 by a connecting bolt 14. The pressing plate 13 is used for abutting against the baffle 5, so that the pressing plate 13 and the pin shaft 3 cannot rotate.

In this embodiment, an excavator is also provided, which includes the above connecting device.

Example two

The present embodiment is different from the first embodiment in that the buffer 4 may be a compression spring. Wherein, when in installation, the compression spring is sleeved on the pin shaft 3.

Compare in the ripples spring, in this embodiment, only need use a compression spring can, it is more convenient to install.

EXAMPLE III

The present embodiment is different from the first embodiment in that the buffer 4 may be an elastic ring. Wherein, when in installation, the elastic ring is sleeved on the pin shaft 3.

In this embodiment, the elastic ring may be any one of a rubber ring, a TPU ring, or an EVA ring.

The TPU ring is made of TPU.

TPU is the acronym for Thermoplastic polyurethanes, the name of which is Thermoplastic polyurethane elastomer rubber. Among them, TUP has the advantages of good elasticity, wide hardness range, wear resistance, oil resistance, etc.

The EVA ring is made of EVA as raw material.

EVA is an English abbreviation of ethylene-vinyl acetate copolymer, wherein the abbreviation is ethylene-vinyl acetate copolymer. The EVA has the advantages of good buffering, shock resistance, heat insulation, moisture resistance and the like.

In this embodiment, bolster 4 adopts the chemical material to make, and the cost is lower, and processing is more convenient.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A connecting device applied to an excavator is characterized by comprising:

the pin shaft is used for connecting the bucket rod and the movable arm;

the buffer piece is used for providing buffer force for the pin shaft;

a baffle is arranged at the top of the pin shaft;

2. The coupling device for an excavator according to claim 1 wherein the buffer member has elasticity.

3. The attachment device for an excavator according to claim 2 wherein the buffer member comprises a wave spring;

the wave spring is sleeved on the pin shaft.

4. The attachment device for an excavator according to claim 2 wherein the buffer member comprises a compression spring;

the compression spring is sleeved on the pin shaft.

5. The attachment device for an excavator of claim 2 wherein the buffer member comprises an elastic ring;

the elastic ring is sleeved on the pin shaft.

6. The attachment device for use with an excavator of claim 5 wherein the resilient ring comprises any one of a rubber ring, a TPU ring or an EVA ring.

7. The connecting device applied to the excavator as claimed in claim 1 or 2, wherein a gland is fixedly arranged at the bottom of the pin shaft;

the buffer piece is abutted to the gland.

8. The connecting device applied to the excavator as claimed in claim 7, wherein a washer is sleeved on the pin shaft and located between the gland and the movable arm;

9. The connecting device applied to the excavator according to claim 7, wherein the gland is fixedly connected with the pin shaft through a fixing bolt.

10. An excavator, comprising the coupling device for an excavator according to any one of claims 1 to 9.