CN211737740U

CN211737740U - Connecting device and engineering machinery

Info

Publication number: CN211737740U
Application number: CN202020283965.7U
Authority: CN
Inventors: 杨航杰; 李翔龙; 谭帆; 魏亚洲
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2020-10-23
Anticipated expiration: 2030-03-10

Abstract

An embodiment of the utility model provides a connecting device and engineering machine tool relates to the engineering machine tool field. The connecting device comprises a first connecting seat, a second connecting seat, a connecting piece and a fixing piece, wherein the connecting piece is provided with a first connecting part, a second connecting part and a third connecting part; the first connecting part is connected with the first connecting seat, and the second connecting part and the third connecting part extend into the second connecting seat; the fixing piece is connected with the second connecting seat and is provided with a first fixing structure and a second fixing structure; the first fixing structure is matched with the second connecting part; the second fixing structure is matched with the third connecting part. The connecting device and the engineering machinery can ensure the stability of connection and ensure the connection effect, thereby ensuring the reliability and safety of use.

Description

Connecting device and engineering machinery

Technical Field

The utility model relates to an engineering machine tool field particularly, relates to a connecting device and engineering machine tool.

Background

The excavator is all abominable operating condition in the operation environment of snatching, especially the device in fixed connection grab bucket and otic placode round pin hub connection department is direct to expose outside, and here is easy to lose efficacy especially. The reason of inefficacy is under abominable operational environment, the atress is great and easy for external debris to give and hit, especially threaded connection's screw, threaded connection itself is inefficacy very easily, in addition the easy rubble of striking is given and is hit, the screw under long-time impact striking can take place to lose efficacy the fracture, the lug can take place to desolder even, when snatching some reinforcing bars, the grab bucket is snatching the in-process, the impact force is very big, the reinforcing bar that intensity is high can directly stab the fixed knot structure that exposes outside, fixed connection department can directly cause bolt failure and baffle lug to drop owing to receive the great impact of foreign object. In case of failure, the pin shaft not only can move axially and rotate radially, but also can cause great potential safety hazard. In addition, the existing scheme only fixes one end of the pin shaft, the unidirectional fixation easily causes stress concentration at the crank of the pin shaft to deform in long-time high-strength load and vibration, the threaded connection easily fails, and the tightness and the reliability can be reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at including, for example, provide a connecting device and engineering machine tool, it can effectively prevent that hookup location from suffering the striking, reduces the inefficacy possibility, guarantees the stability and the connection effect of connection to guarantee reliability and the security of using.

The embodiment of the utility model discloses a can realize like this:

in a first aspect, an embodiment provides a connecting device, configured to connect a first component and a second component of a construction machine, where the first component and the second component are capable of rotating relative to each other, where the connecting device includes a first connecting seat, a second connecting seat, a connecting piece, and a fixing piece, where the first connecting seat and the second connecting seat are configured to be connected with the first component, and the connecting piece is configured to be connected with the second component;

the connecting piece is provided with a first connecting part, a second connecting part and a third connecting part, the first connecting part and the second connecting part are positioned at two opposite ends of the connecting piece, and the second connecting part and the third connecting part are positioned at the same end of the connecting piece; the first connecting part is connected with the first connecting seat, and the second connecting part and the third connecting part both extend into the second connecting seat;

the fixing piece is connected with the second connecting seat and is provided with a first fixing structure and a second fixing structure; the first fixing structure is matched with the second connecting part, is used for fixing the connecting piece and the second connecting seat and is used for limiting the axial movement of the connecting piece relative to the second connecting seat; the second fixing structure is matched with the third connecting part, and is used for fixing the connecting piece and the second connecting seat and limiting the radial rotation of the connecting piece relative to the second connecting seat.

In an optional implementation manner, the first fixing structure is provided with an accommodating cavity and an opening communicated with the accommodating cavity, an area of the accommodating cavity is larger than an area of the opening, the opening is used for the second connecting portion to extend into the accommodating cavity, and the accommodating cavity is used for accommodating the second connecting portion and limiting the second connecting portion in the accommodating cavity.

In an alternative embodiment, the second connecting portion has a first longer side and a first shorter side, the opening has a second longer side and a second shorter side, the side length of the first longer side is greater than that of the second shorter side, the first longer side is opposite to the second longer side, and the first shorter side is opposite to the second shorter side when the second connecting portion extends into the accommodating cavity.

In an optional embodiment, the fixing member has a first side surface and a second side surface opposite to each other, the opening is disposed on the first side surface and is inwardly recessed relative to the first side surface, the second fixing structure is disposed on the fixing member and is capable of outwardly protruding relative to the first side surface, and the connecting member is provided with end surfaces of the second connecting portion and the third connecting portion, which are attached to the first side surface.

In an optional embodiment, the third connecting portion is provided with a connecting groove, the second fixing structure includes a clamping member, a shifting member and an elastic member, the elastic member is abutted between the clamping member and the fixing member for abutting the clamping member in the connecting groove, and the shifting member is connected with the clamping member and rotatably connected with the fixing member for extending or retracting the clamping member into or out of the connecting groove.

In an optional embodiment, the fixing member is provided with a mounting groove, the mounting groove has a first notch and a second notch, the first notch and the second notch are respectively located on two opposite sides of the fixing member, the clamping member, the toggle member and the elastic member are all disposed in the mounting groove, the clamping member can extend out of the first notch, and the toggle member is exposed out of or extends out of the second notch from the second notch.

In optional embodiment, the mounting groove includes first groove, second groove and the third groove that communicates in proper order, the extending direction in first groove with the extending direction in second groove becomes the contained angle, first notch set up in first groove, the second notch set up in the third groove, the elastic component install in the third groove, and flexible direction with the extending direction in third groove is unanimous, the card is held the piece and is located the third groove, dial the piece rotationally set up in the second groove, and stretch into the first groove.

In an optional implementation manner, the connecting device further includes a poke rod, and the poke rod can extend into the mounting groove from the second notch and drive the poking member, so that the poking member drives the clamping member to move.

In an optional embodiment, a shifting part is arranged on the clamping part, and the shifting part is matched with the shifting part and used for shifting the clamping part to extend into or withdraw from the connecting groove.

In a second aspect, embodiments provide a work machine comprising a coupling device according to any of the preceding embodiments.

The utility model discloses beneficial effect includes, for example: the connecting piece is connected and fixed with first connecting seat and second connecting seat, and radial rotation and axial displacement between connecting piece and first connecting seat and the second connecting seat are all fixed and are restricted promptly, that is to say, the connecting piece can not take place radial rotation and axial displacement relative first connecting seat and second connecting seat. The connecting piece is provided with a first connecting part, a second connecting part and a third connecting part, the first connecting part is connected with the first connecting seat, and the second connecting part and the third connecting part are connected with the second connecting seat through fixing pieces. The fixing piece is provided with a first fixing structure and a second fixing structure, and the first fixing structure is matched with the second connecting part and used for limiting the axial movement of the connecting piece relative to the second connecting seat; the second fixing structure is matched with the third connecting part and used for limiting the radial rotation of the connecting piece relative to the second connecting seat. The embodiment of the utility model provides an in, through the cooperation of first connecting portion and first connecting seat, the cooperation of second connecting portion and first fixed knot structure, the cooperation of third connecting piece and second fixed knot structure, realized the fixed connection between connecting piece and first connecting seat and the second connecting seat. When first connecting seat and second connecting seat are connected with first part, connecting piece and second part are connected, first part and second part can rotate relatively, and the connecting piece is connected between first connecting seat and the second connecting seat, can guarantee when first part and second part rotate relatively, and the connecting piece is connected with the stability between first connecting seat and the second connecting seat to good reliability and security have.

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 is a schematic structural diagram of a connection device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the connection device of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the structure of the connector of FIG. 1;

FIG. 4 is a schematic view of the connector of FIG. 2 from another perspective;

FIG. 5 is a schematic structural view of the first connecting seat in FIG. 1;

FIG. 6 is an enlarged schematic view of the structure at A in FIG. 4;

FIG. 7 is a schematic view of the connector of FIG. 2 from a further perspective;

FIG. 8 is a schematic structural view of the fixing member of FIG. 1;

FIG. 9 is a cross-sectional view of the fastener of FIG. 8;

FIG. 10 is a schematic structural view of a third connecting portion and a second fixing structure in FIG. 1;

FIG. 11 is a schematic diagram of the method at B in FIG. 10;

fig. 12 is a cross-sectional structural view of the fixing member of fig. 11.

Icon: 100-a connecting means; 110-a first connection mount; 112-a second connecting structure; 120-a second connection seat; 130-a connector; 131-a first connection; 1311-a first connecting structure; 132-a second connecting portion; 1321-a first longer side; 1322-a first shorter side; 1323-larger end; 1324-smaller connections; 133-a third connecting portion; 1331-connecting grooves; 140-a fixture; 141-a first fixation structure; 1411-a housing chamber; 1412-opening; 1413-a second longer side; 1414-a second shorter side; 142-a second fixed structure; 1421-a catch; 1422-toggle; 1423-elastic member; 1424-toggle; 143-a first side; 144-a second side; 145-mounting grooves; 1451-a first notch; 1452-a second notch; 1453-a first tank; 1454-a second trough; 1455-a third tank; 150-poker bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1 and fig. 2, a schematic structural diagram of a connecting device 100 according to an embodiment of the present invention is shown. This connecting device 100 can be used for connecting engineering machine's first part and second part, and this first part and second part can rotate relatively, the embodiment of the utility model provides a connecting device 100 can guarantee the stability that first part and second part are connected, guarantee the linkage effect to guarantee reliability and the security of using.

It should be noted that, foretell engineering machine can be excavator, grab bucket machine etc. and this first part and second part can be grab bucket and the otic placode of excavator respectively, and grab bucket and otic placode rotate relatively, through the embodiment of the utility model provides a connecting device 100 realize the connection of grab bucket and otic placode, can guarantee the stability of both connections, improve its life and reliability.

Meanwhile, it should also be noted that, when the connecting device 100 is applied to an excavator, the first member may be provided on the ear plate or may be provided integrally with the ear plate; the second part may be provided on the grab or be integrally formed with the grab.

In the embodiment of the present invention, the connection device 100 includes a first connection seat 110, a second connection seat 120, a connection member 130 and a fixing member 140, the connection member 130 is respectively connected to the first connection seat 110 and the second connection seat 120, and the connection member 130 is connected to the second connection seat 120 through the fixing member 140, the first connection seat 110 and the second connection seat 120 are used for being connected to a first component, and the connection member 130 is used for being connected to a second component.

Referring to fig. 3, the connecting member 130 is provided with a first connecting portion 131, a second connecting portion 132 and a third connecting portion 133, the first connecting portion 131 and the second connecting portion 132 are located at two opposite ends of the connecting member 130, and the second connecting portion 132 and the third connecting portion 133 are located at the same end of the connecting member 130; the first connecting portion 131 is connected to the first connecting seat 110, and the second connecting portion 132 and the third connecting portion 133 both extend into the second connecting seat 120.

Referring to fig. 8, the fixing member 140 is connected to the second connecting seat 120 and is provided with a first fixing structure 141 and a second fixing structure 142; the first fixing structure 141 is matched with the second connecting part 132, and is used for fixing the connecting piece 130 and the second connecting seat 120 and limiting the axial movement of the connecting piece 130 relative to the second connecting seat 120; the second fixing structure 142 is engaged with the third connecting portion 133 for fixing the connecting member 130 and the second connecting section 120 and for restricting radial rotation of the connecting member 130 with respect to the second connecting section 120.

It should be understood that, in the embodiment of the present invention, the connecting member 130 is connected and fixed with the first connecting seat 110 and the second connecting seat 120, that is, the radial rotation and the axial movement between the connecting member 130 and the first connecting seat 110 and the second connecting seat 120 are both fixed and limited, that is, the connecting member 130 cannot rotate radially and move axially relative to the first connecting seat 110 and the second connecting seat 120. The connecting member 130 is provided with a first connecting portion 131, a second connecting portion 132 and a third connecting portion 133, the first connecting portion 131 is connected to the first connecting seat 110, and the second connecting portion 132 and the third connecting portion 133 are connected to the second connecting seat 120 by a fixing member 140. A first fixing structure 141 and a second fixing structure 142 are disposed on the fixing member 140, and the first fixing structure 141 is engaged with the second connecting portion 132 for limiting the axial movement of the connecting member 130 relative to the second connecting seat 120; the second fixing structure 142 is coupled to the third connecting portion 133 for limiting the radial rotation of the connecting member 130 relative to the second connecting seat 120.

In the embodiment of the present invention, the fixing connection between the connecting member 130 and the first connecting seat 110 and the second connecting seat 120 is realized through the cooperation of the first connecting portion 131 and the first connecting seat 110, the cooperation of the second connecting portion 132 and the first fixing structure 141, and the cooperation of the third connecting member 130 and the second fixing structure 142. When the first connecting seat 110 and the second connecting seat 120 are connected with the first component and the connecting piece 130 is connected with the second component, the first component and the second component can rotate relatively, and the connecting piece 130 is connected with the first connecting seat 110 and the second connecting seat 120, so that the stable connection between the connecting piece 130 and the first connecting seat 110 and the second connecting seat 120 can be ensured when the first component and the second component rotate relatively, and the connecting device has good reliability and safety.

Further, when the coupling device 100 is applied to an excavator, the first and

second coupling seats

110 and 120 may be provided on or integrally with the lug plate; the link 130 may be provided on the grapple or may be integrally formed with the grapple.

Referring to fig. 2, fig. 4 and fig. 5, alternatively, the connection manner between the first connecting seat 110 and the first connecting portion 131 may be: a first connection structure 1311 is disposed on the first connection portion 131, and a second connection structure 112 corresponding to the first connection structure 1311 is disposed on the first connection seat 110. Further, the first connection structure 1311 may be a protrusion or a groove, and the second connection structure 112 may be a groove corresponding to the protrusion or a protrusion corresponding to the groove, so as to realize the connection between the first connection part 131 and the first connection seat 110.

Referring to fig. 9, in an alternative embodiment, the first fixing structure 141 may be provided with an accommodating cavity 1411 and an opening 1412 communicated with the accommodating cavity 1411, an area of the accommodating cavity 1411 is larger than an area of the opening 1412, the opening 1412 is used for the second connecting portion 132 to extend into the accommodating cavity 1411, and the accommodating cavity 1411 is used for accommodating the second connecting portion 132 and limiting the second connecting portion 132 in the accommodating cavity 1411.

It should be noted that the second connecting portion 132 extends into the accommodating chamber 1411 from the opening 1412, and since the area of the accommodating chamber 1411 is larger than that of the opening 1412, the first fixing structure 141 can rotate in the accommodating chamber 1411, and the second fixing structure 142 and the third connecting portion 133 can be connected by rotating at a certain angle.

Referring to fig. 7, the second connecting portion 132 has a first longer side 1321 and a first shorter side 1322, the opening 1412 has a second longer side 1413 and a second shorter side 1414, the side length of the first longer side 1321 is greater than that of the second shorter side 1414, when the second connecting portion 132 is inserted into the accommodating cavity 1411, the first longer side 1321 is opposite to the second longer side 1413, and the first shorter side 1322 is opposite to the second shorter side 1414.

That is to say, after the second connecting portion 132 rotates a certain angle relative to the opening 1412, since the length of the first longer side 1321 is greater than the length of the second shorter side 1414, the second connecting portion 132 cannot directly withdraw from the accommodating cavity 1411, so that the second connecting portion 132 is limited in the accommodating cavity 1411. The second fixing structure 142 and the third connecting portion 133 can be connected and matched after the fixing member 140 rotates by a certain angle, and at this time, the first fixing structure 141 is matched with the second connecting portion 132, and since the second fixing structure 142 can limit the radial rotation of the connecting member 130, the axial movement and the radial rotation of the connecting member 130 are both limited, thereby realizing the connection and fixation of the connecting member 130.

Optionally, the second connecting portion 132 is substantially rectangular, and the opening 1412 is also substantially rectangular.

Referring to fig. 6, optionally, the second connecting portion 132 includes a larger end portion 1323 extending into the opening 1412 and received in the receiving cavity 1411, and a smaller connecting portion 1324 connecting the larger end portion 1323, both of which refer to cross-sectional dimensions, as can be seen in detail in the drawings. The smaller connecting portion 1324 can rotate in the opening 1412, and the larger end portion 1323 has the first longer side 1321 and the first shorter side 1322, i.e., the larger end portion 1323 can be limited in the receiving cavity 1411.

Referring to fig. 8 and 9, the fixing element 140 has a first side surface 143 and a second side surface 144 opposite to each other, optionally, the opening 1412 is disposed on the first side surface 143 and is recessed inward relative to the first side surface 143, the second fixing structure 142 is disposed on the fixing element 140 and can be protruded outward relative to the first side surface 143, and an end surface of the connecting element 130, which is provided with the second connecting portion 132 and the third connecting portion 133, is attached to the first side surface 143.

That is, the second connecting portion 132 and the third connecting portion 133 are respectively connected and matched with the first fixing structure 141 and the second fixing structure 142 at the first side 143. In an alternative embodiment, the second connecting seat 120 is provided with a through hole, and the size of the fixing member 140 is substantially the same as the size of the through hole. When assembling, the first side 143 of the fixing member 140 is inserted into the through hole, and the second connecting portion 132 is inserted into the receiving groove from the opening 1412. Then, the fixing member 140 is rotated to make the second fixing structure 142 cooperate with the third connecting portion 133, so as to fix the connecting member 130.

Meanwhile, the connection position is inside the whole connection device 100, that is, external collision basically does not affect the connection position, so that the possibility of failure caused by collision is reduced, and the stability and the service life of connection are further ensured.

Referring to fig. 10 and 11, in an alternative embodiment, the third connecting portion 133 may be provided with a connecting groove 1331, the second fixing structure 142 includes a retaining member 1421, a toggle member 1422 and an elastic member 1423, the elastic member 1423 is abutted between the retaining member 1421 and the fixing member 140 for abutting the retaining member 1421 in the connecting groove 1331, and the toggle member 1422 is connected with the retaining member 1421 and rotatably connected with the fixing member 140 for extending or retracting the retaining member 1421 into or out of the connecting groove 1331.

That is, the engagement between the second fixing structure 142 and the third connecting portion 133 may be the engagement between the connecting groove 1331 and the retaining member 1421, when connecting, the retaining member 1421 extends into the connecting groove 1331 and abuts against the inner wall of the connecting groove 1331 under the action of the elastic member 1423; when the connector 130 is detached from the second connecting seat 120 and the fixing member 140, an external force acts on the toggle member 1422, the toggle member 1422 drives the retaining member 1421 to compress the elastic member 1423, and the retaining member 1421 is withdrawn from the connecting groove 1331, and then the fixing member 140 is rotated to withdraw the second connecting portion 132 from the accommodating cavity 1411.

In the solution that the second fixing structure 142 includes the retaining member 1421, the toggle member 1422 and the elastic member 1423, the toggle member 1422 is toggled by the rotation of the toggle member 1422 relative to the fixing member 140, and the operation mode is simple and is convenient to detach and replace. Meanwhile, the structure is compact, the occupied space is small, and the manufacture is convenient.

Referring to fig. 12, in an alternative embodiment, the fixing member 140 may be provided with a mounting groove 145, the mounting groove 145 has a first notch 1451 and a second notch 1452, the first notch 1451 and the second notch 1452 are respectively located at two opposite sides of the fixing member 140, the holding member 1421, the toggle member 1422 and the elastic member 1423 are all disposed in the mounting groove 145, the holding member 1421 can extend from the first notch 1451, and the toggle member 1422 is exposed from the second notch 1452 or extends from the second notch 1452.

That is, the fixing member 140 has a first side surface 143 and a second side surface 144, the first notch 1451 is opened on the first side surface 143 and penetrates through the first side surface 143, and the second notch 1452 is opened on the second side surface 144 and penetrates through the second side surface 144.

Further, the mounting groove 145 may include a first groove 1453, a second groove 1454 and a third groove 1455 that are sequentially connected, an extending direction of the first groove 1453 forms an included angle with an extending direction of the second groove 1454, the first groove 1451 is disposed at the first groove 1453, the second groove 1452 is disposed at the third groove 1455, the elastic member 1423 is mounted at the third groove 1455, and an extending direction of the elastic member is consistent with an extending direction of the third groove 1455, the holding member 1421 is disposed at the third groove 1455, and the toggle member 1422 is rotatably disposed at the second groove 1454 and extends into the first groove 1453.

Alternatively, the first groove 1453 may extend in a direction substantially corresponding to the axial direction of the fixing member 140, the second groove 1454 may extend in a direction perpendicular to the first groove 1453, and the third groove 1455 may extend in a direction perpendicular to the second groove 1454 and substantially parallel to the first groove 1453.

The number of the mounting grooves 145 and the corresponding structures may be two, or other numbers, and accordingly, the number of the coupling grooves 1331 of the third connecting portion 133 corresponds to the number of the mounting grooves 145 and the second fixing structures 142.

Referring to fig. 1, in an alternative embodiment, the connecting device 100 may further include a toggle bar 150, wherein the toggle bar 150 can extend into the mounting groove 145 from the second notch 1452 and drive the toggle member 1422, so that the toggle member 1422 drives the holding member 1421 to move. The tap lever 150 is capable of extending into the second notch 1452, and the tap lever 150 may extend into the second notch 1452 at the same number of locations as the second notch 1452, such as two as shown.

Alternatively, the structure of the toggle bar 150 can refer to the drawings, that is, the toggle member 1422 is completely accommodated in the mounting groove 145, so as to avoid connection failure caused by mistakenly touching the toggle member 1422.

In an alternative embodiment, the holding member 1421 is provided with a toggle portion 1424, and the toggle portion 1422 is engaged with the toggle portion 1424 for toggling the holding member 1421 to extend into or withdraw from the connecting groove 1331. The toggle portion 1424 may be a raised structure.

The embodiment of the present invention further provides an engineering machine, including the connecting device 100 according to any one of the previous embodiments. The engineering machinery can be equipment such as an excavator, a grab bucket machine and the like.

The utility model discloses beneficial effect includes, for example: the connecting member 130 is connected and fixed to the first connecting seat 110 and the second connecting seat 120, that is, the radial rotation and the axial movement between the connecting member 130 and the first connecting seat 110 and the second connecting seat 120 are both fixed and limited, that is, the connecting member 130 cannot rotate radially and move axially relative to the first connecting seat 110 and the second connecting seat 120. The connecting member 130 is provided with a first connecting portion 131, a second connecting portion 132 and a third connecting portion 133, the first connecting portion 131 is connected to the first connecting seat 110, and the second connecting portion 132 and the third connecting portion 133 are connected to the second connecting seat 120 by a fixing member 140. A first fixing structure 141 and a second fixing structure 142 are disposed on the fixing member 140, and the first fixing structure 141 is engaged with the second connecting portion 132 for limiting the axial movement of the connecting member 130 relative to the second connecting seat 120; the second fixing structure 142 is coupled to the third connecting portion 133 for limiting the radial rotation of the connecting member 130 relative to the second connecting seat 120. In the embodiment of the present invention, the fixing connection between the connecting member 130 and the first connecting seat 110 and the second connecting seat 120 is realized through the cooperation of the first connecting portion 131 and the first connecting seat 110, the cooperation of the second connecting portion 132 and the first fixing structure 141, and the cooperation of the third connecting member 130 and the second fixing structure 142. When the first connecting seat 110 and the second connecting seat 120 are connected with the first component and the connecting piece 130 is connected with the second component, the first component and the second component can rotate relatively, and the connecting piece 130 is connected with the first connecting seat 110 and the second connecting seat 120, so that the stable connection between the connecting piece 130 and the first connecting seat 110 and the second connecting seat 120 can be ensured when the first component and the second component rotate relatively, and the connecting device has good reliability and safety.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A connecting device is used for connecting a first component and a second component of engineering machinery, and the first component and the second component can rotate relatively, and the connecting device is characterized by comprising a first connecting seat, a second connecting seat, a connecting piece and a fixing piece, wherein the first connecting seat and the second connecting seat are used for being connected with the first component, and the connecting piece is used for being connected with the second component;

2. The connecting device according to claim 1, wherein the first fixing structure is provided with a receiving cavity and an opening communicated with the receiving cavity, the receiving cavity has an area larger than that of the opening, the opening is used for the second connecting portion to extend into the receiving cavity, and the receiving cavity is used for receiving the second connecting portion and limiting the second connecting portion in the receiving cavity.

3. The connecting device according to claim 2, wherein the second connecting portion has a first longer side and a first shorter side, the opening has a second longer side and a second shorter side, the first longer side has a side length greater than that of the second shorter side, the first longer side is opposite to the second longer side when the second connecting portion is inserted into the receiving cavity, and the first shorter side is opposite to the second shorter side.

4. The connecting device according to claim 2, wherein the fixing member has a first side surface and a second side surface opposite to each other, the opening is disposed on the first side surface and is recessed inward relative to the first side surface, the second fixing structure is disposed on the fixing member and is capable of protruding outward relative to the first side surface, and an end surface of the connecting member, on which the second connecting portion and the third connecting portion are disposed, is attached to the first side surface.

5. The connecting device according to any one of claims 1 to 4, wherein the third connecting portion is provided with a connecting groove, the second fixing structure includes a retaining member, a toggle member and an elastic member, the elastic member is abutted between the retaining member and the fixing member for abutting the retaining member in the connecting groove, and the toggle member is connected with the retaining member and rotatably connected with the fixing member for extending the retaining member into or out of the connecting groove.

6. The connecting device according to claim 5, wherein the fixing member is provided with a mounting groove, the mounting groove has a first notch and a second notch, the first notch and the second notch are respectively located at two opposite sides of the fixing member, the retaining member, the toggle member and the elastic member are all disposed in the mounting groove, the retaining member can extend from the first notch, and the toggle member is exposed from the second notch or extends from the second notch.

7. The connecting device according to claim 6, wherein the mounting groove comprises a first groove, a second groove and a third groove which are sequentially communicated, an extending direction of the first groove forms an included angle with an extending direction of the second groove, the first notch is arranged in the first groove, the second notch is arranged in the third groove, the elastic member is arranged in the third groove, a stretching direction of the elastic member is consistent with the extending direction of the third groove, the clamping member is arranged in the third groove, and the shifting member is rotatably arranged in the second groove and extends into the first groove.

8. The connecting device according to claim 6, further comprising a poke rod, wherein the poke rod can extend into the mounting groove from the second notch and drive the poke member, so that the poke member drives the holding member to move.

9. The connecting device as claimed in claim 5, wherein the retaining member is provided with a shifting portion, and the shifting member is engaged with the shifting portion for shifting the retaining member to extend into or withdraw from the connecting groove.

10. A working machine, characterized in that it comprises a coupling device according to any one of claims 1-9.