Connecting mechanism for excavator and excavator

Abstract

An embodiment of the present invention provides a connecting mechanism for an excavator and an excavator. The connecting mechanism for the excavator includes: a pin shaft, a pin shaft fixing device, and a pressing device. Among them, the pin shaft is penetrated between the bucket and the boom of the excavator, the pin shaft fixing device is connected between the bucket and the pin shaft to connect the pin shaft with the bucket and the boom, and the pressing device is installed on the other side of the bucket to tightly connect the bucket and the boom. Through this structural arrangement, the bucket and the boom are fixedly connected through the pin shaft and the pin shaft fixing device. The pressing device is installed on one side of the bucket, and the pressing device can always tightly connect the bucket and the boom. Thus, it is possible to avoid disassembling a large number of components to adjust the connection gap between the bucket and the boom, which saves time and effort and greatly improves the working efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of excavators, and particularly to a connecting mechanism for an excavator and an excavator. Background Art

[0002] During long-term operation in a harsh working condition, the connection gap between the bucket and the dipper arm of an excavator often increases due to wear and other reasons, and it is necessary to manually adjust the connection gap irregularly. At present, usually, the gap between the dipper arm and the bucket is reduced by adjusting bolts and disassembling and installing gaskets, so as to tightly connect the bucket and the dipper arm. However, this adjustment method requires disassembling a large number of components, which is time-consuming and laborious, and the working efficiency is relatively low. Summary of the Invention

[0003] The present invention provides a connecting mechanism for an excavator and an excavator, which is used to solve the problems of time-consuming, laborious and low efficiency when adjusting the gap between the bucket and the dipper arm in the prior art, so as to achieve the effect of saving time and effort and conveniently adjusting the connection gap between the bucket and the dipper arm.

[0004] According to the first aspect of the present invention, a connecting mechanism for an excavator is provided, including: a pin shaft, a pin shaft fixing device and a pressing device

[0005] Wherein, the pin shaft is arranged between the bucket and the dipper arm of the excavator, the pin shaft fixing device is connected between the bucket and the pin shaft to connect the pin shaft with the bucket and the dipper arm, and the pressing device is installed on the other side of the bucket to tightly connect the bucket and the dipper arm.

[0006] According to the connecting mechanism for an excavator provided by the present invention, the pin shaft fixing device includes a positioning sleeve and a fastener.

[0007] The dipper arm is arranged between a first connecting ear and a second connecting ear formed on the bucket. The pin shaft passes through the first connecting ear, the dipper arm and the second connecting ear. The positioning sleeve is sleeved on the outer side of the pin shaft and connected with the first connecting ear. The fastener passes through the positioning sleeve and the pin shaft. The pressing device is installed at the second connecting ear.

[0008] According to the connecting mechanism for an excavator provided by the present invention, the pressing device includes a pressing sleeve, a pressing plate and a connecting rod mechanism.

[0009] Wherein, the pressing sleeve is arranged between the dipper arm and the pressing plate, and the pressing sleeve can slide on the pin shaft and push the dipper arm to move. The pressing plate is connected to the outside of the second connecting ear. The linkage mechanism passes through the second connecting ear and is installed between the pressing sleeve and the pressing plate, and can push the pressing sleeve to move, so that the dipper arm and the bucket are tightly connected.

[0010] According to a connecting mechanism for an excavator provided by the present invention, a first plate body is installed between the pressing sleeve and the second connecting ear. A second plate body is installed between the pressing plate and the second connecting ear. Coaxial through holes are formed on the first plate body, the second plate body and the second connecting ear. Each of the coaxial through holes together forms a receiving cavity. The linkage mechanism is installed in the receiving cavity.

[0011] According to a connecting mechanism for an excavator provided by the present invention, the linkage mechanism includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod.

[0012] Wherein, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are sequentially and rotatably connected end to end to form a rhombus structure. A first sliding block is installed at the rotational connection point of the first connecting rod and the fourth connecting rod. A second sliding block is installed at the rotational connection point of the second connecting rod and the third connecting rod. A first chute and a second chute are formed in the receiving cavity. The first slider is slidably installed in the first chute. The second slider is slidably installed in the second chute.

[0013] Wherein, a first top plate is connected at the rotational connection point of the first connecting rod and the second connecting rod. A second top plate is connected at the rotational connection point of the third connecting rod and the fourth connecting rod. The first top plate can press against the pressing sleeve. The second top plate can press against the pressing plate.

[0014] And a tension spring is installed between the rotational connection point of the first connecting rod and the fourth connecting rod and the rotational connection point of the second connecting rod and the third connecting rod.

[0015] According to a connecting mechanism for an excavator provided by the present invention, a threaded hole is formed on the pressing plate. An adjusting bolt is installed in the threaded hole. The second top plate can extend into the threaded hole and press against a compression spring arranged between the second top plate and the adjusting bolt.

[0016] According to a connecting mechanism for an excavator provided by the present invention, the connecting mechanism for an excavator includes a plurality of the linkage mechanisms. A plurality of the threaded holes are correspondingly formed on the pressing plate. The adjusting bolt and the compression spring are installed in each of the threaded holes. Each of the first top plates presses against the pressing sleeve. Each of the second top plates respectively presses against each of the compression springs.

[0017] According to a connecting mechanism for an excavator provided by the present invention, the first chute and the second chute are symmetrically arranged with respect to the line connecting the rotation connection points of the first link and the second link and the rotation connection points of the third link and the fourth link as the axis of symmetry.

[0018] According to a connecting mechanism for an excavator provided by the present invention, the first chute and the second chute are symmetric and inclined to each other. Moreover, the distance between the first chute and the second chute near the end of the pressing sleeve is smaller than the distance between the first chute and the second chute near the end of the pressing plate.

[0019] According to a second aspect of the present invention, there is also provided a working machine, which includes a bucket, an arm, and the connecting mechanism for an excavator as described above.

[0020] Wherein, the bucket includes a connecting ear. The connecting mechanism for an excavator is installed between the connecting ear and the arm to tightly connect the bucket and the arm.

[0021] In the connecting mechanism for an excavator provided by the present invention, the pin shaft is disposed between the bucket and the arm, and the pin shaft fixing device is connected between the bucket and the pin shaft to connect the pin shaft with the bucket and the arm. The pressing device is installed on the other side of the bucket to tightly connect the bucket and the arm.

[0022] With this structural arrangement, the bucket and the arm are fixedly connected through the pin shaft and the pin shaft fixing device. The pressing device is installed on one side of the bucket, and the pressing device can always tightly connect the bucket and the arm. Thus, it is possible to avoid disassembling a large number of components to adjust the connection gap between the bucket and the arm, which saves time and effort and greatly improves the working efficiency.

[0023] Furthermore, in the working machine provided by the present invention, since the working machine includes the connecting mechanism for an excavator as described above, therefore, it also has the above-mentioned various advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic cross-sectional structure view of the connecting mechanism for an excavator provided by the present invention;

[0026] Figure 2 It is a schematic cross-sectional structure diagram of a partial structure of the connecting mechanism for an excavator provided by the present invention;

[0027] Figure 3 It is a schematic structure diagram of the link mechanism of the connecting mechanism for an excavator provided by the present invention;

[0028] Figure 4 It is a schematic three-dimensional structure diagram of the connecting mechanism for an excavator provided by the present invention;

[0029] Reference signs:

[0030] 101: First connecting ear; 102: Second connecting ear; 200: Bucket rod;

[0031] 300: Pin shaft; 401: Positioning sleeve; 402: Fastening piece;

[0032] 501: Compression sleeve; 502: First plate body; 503: Second plate body;

[0033] 600: Pressure plate; 601: Threaded hole; 602: Adjusting bolt;

[0034] 603: Compression spring; 700: Link mechanism; 701: First link;

[0035] 702: Second link; 703: Third link; 704: Fourth link;

[0036] 705: First slider; 706: Second slider; 707: First top plate;

[0037] 708: Second top plate; 709: Tension spring. Detailed implementation manners

[0038] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0039] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of 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 a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "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 directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0041] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0042] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0043] The following will be combined with Figures 1 to 4 Describe a connection mechanism for an excavator and an excavator provided by an embodiment of the present invention. It should be understood that the following is only a schematic embodiment of the present invention and does not constitute any special limitation to the present invention.

[0044] An embodiment of the first aspect of the present invention provides a connection mechanism for an excavator, such asFigure 1 As shown, the connecting mechanism for the excavator includes: a pin shaft 300, a pin shaft fixing device, and a pressing device.

[0045] Among them, the pin shaft 300 is passed through between the bucket and the stick 200 of the excavator. The pin shaft fixing device is connected between the bucket and the pin shaft 300 to connect the pin shaft 300 with the bucket and the stick 200. The pressing device is installed on the other side of the bucket to tightly connect the bucket and the stick 200.

[0046] Through this structural arrangement, the bucket and the stick 200 are fixedly connected through the pin shaft 300 and the pin shaft fixing device. The pressing device is installed on one side of the bucket, and the pressing device can always tightly connect the bucket and the stick 200. Thus, it is possible to avoid disassembling a large number of components to adjust the connection gap between the bucket and the stick 200, saving time and effort and greatly improving the work efficiency.

[0047] In an embodiment of the present invention, the pin shaft fixing device includes a positioning sleeve 401 and a fastener 402.

[0048] The stick 200 is disposed between a first connecting ear 101 and a second connecting ear 102 formed on the bucket. The pin shaft 300 is passed through the first connecting ear 101, the stick 200, and the second connecting ear 102. The positioning sleeve 401 is sleeved outside the pin shaft 300 and connected to the first connecting ear 101. The fastener 402 is passed through between the positioning sleeve 401 and the pin shaft 300. The pressing device is installed at the second connecting ear 102.

[0049] For example, as Figure 1 shown, a first connecting ear 101 and a second connecting ear 102 are formed on the bucket. The stick 200 is disposed between the first connecting ear 101 and the second connecting ear 102. And, coaxial through holes are formed on the first connecting ear 101, the second connecting ear 102, and the stick 200. The pin shaft 300 sequentially passes through the first connecting ear 101, the stick 200, and the second connecting ear 102 through the coaxial through holes. The positioning sleeve 401 is sleeved outside the pin shaft 300 and fixedly connected to the first connecting ear 101. For example, the positioning sleeve 401 can be welded and connected to the outside of the first connecting ear 101. The fastener 402 passes through and is fixed between the positioning sleeve 401 and the pin shaft 300. The pressing device is installed at the second connecting ear 102 to tightly connect the bucket and the stick 200.

[0050] It should be understood here that no specific limitation is imposed on the specific type of the fastener 402 in the present invention. For example, in an embodiment of the present invention, the fastener 402 includes a bolt and a nut. The bolt passes through the positioning sleeve 401 and the pin shaft 300, and the nut locks the bolt between the positioning sleeve 401 and the pin shaft 300. Further, the bucket and the stick 200 are connected to each other.

[0051] In an embodiment of the present invention, the pressing device includes a pressing sleeve 501, a pressing plate 600, and a linkage mechanism.

[0052] Among them, the pressing sleeve 501 is disposed between the bucket rod 200 and the pressing plate 600. And the pressing sleeve 501 can slide on the pin shaft 300 and push the bucket rod 200 to move. The pressing plate 600 is connected to the outside of the second connecting ear 102. The linkage mechanism passes through the second connecting ear 102 and is installed between the pressing sleeve 501 and the pressing plate 600, and can push the pressing sleeve 501 to move, so that the bucket rod 200 and the bucket are tightly connected.

[0053] Further, in an embodiment of the present invention, a first plate body 502 is installed between the pressing sleeve 501 and the second connecting ear 102. A second plate body 503 is installed between the pressing plate 600 and the second connecting ear 102. Coaxial through holes are provided on the first plate body 502, the second plate body 503, and the second connecting ear 102. The coaxial through holes together form a receiving cavity. The linkage mechanism is installed in the receiving cavity.

[0054] For example, as Figure 1 、 Figure 2 and Figure 4 shown, the pressing sleeve 501 is disposed between the bucket rod 200 and the pressing plate 600. A first plate body 502 is installed between the pressing sleeve 501 and the second connecting ear 102; a second plate body 503 is installed between the second connecting ear 102 and the pressing plate 600. For example, the first plate body 502 and the second plate body 503 are respectively welded to the left and right sides of the second connecting ear 102. Coaxial through holes are provided on the first plate body 502, the second plate body 503, and the second connecting ear 102. The coaxial through holes together form a receiving cavity. The linkage mechanism is installed in the receiving cavity. And the linkage mechanism can push the pressing sleeve 501 to move, so that the pressing sleeve 501 is always pressed against the bucket rod 200, and further the bucket rod 200 is always tightly connected to the bucket.

[0055] According to the embodiments described above, by fixedly connecting the first plate body 502 to the left side of the second connecting ear 102 and the second plate body 503 to the right side, the length of the receiving cavity can be extended, and thus the stroke of the linkage mechanism can be lengthened.

[0056] In an embodiment of the present invention, as Figure 3 shown, the linkage mechanism 700 includes a first link 701, a second link 702, a third link 703, and a fourth link 704.

[0057] Among them, the first link 701, the second link 702, the third link 703 and the fourth link 704 are rotatably connected end to end in sequence to form a rhombus structure. A first slider 705 is installed at the rotatable connection point of the first link 701 and the fourth link 704. A second slider 706 is installed at the rotatable connection point of the second link 702 and the third link 703. A first chute and a second chute are formed in the accommodating cavity. The first slider 705 is slidably installed in the first chute. The second slider 706 is slidably installed in the second chute.

[0058] Among them, a first top plate 707 is connected at the rotatable connection point of the first link 701 and the second link 702. A second top plate 708 is connected at the rotatable connection point of the third link 703 and the fourth link 704. The first top plate 707 can press against the pressing sleeve 501. The second top plate 708 can press against the pressing plate 600.

[0059] Moreover, a tension spring 709 is installed between the rotatable connection point of the first link 701 and the fourth link 704 and the rotatable connection point of the second link 702 and the third link 703.

[0060] Specifically, as Figures 1 to 3 shown, the first link 701, the second link 702, the third link 703 and the fourth link 704 are rotatably connected end to end in sequence to form a rhombus structure. A first slider 705 is installed at the upper connection point of the link mechanism 700, and a second slider 706 is installed at the lower connection point. A first chute is formed on the upper side of the accommodating cavity, and second chutes are symmetrically formed on the lower side of the accommodating cavity. The first slider 705 and the second slider 706 are respectively installed in the first chute and the second chute. Moreover, the first slider 705 and the second slider 706 can slide in the first chute and the second chute respectively. A first top plate 707 is installed at the left connection point of the link mechanism 700, and a second top plate 708 is installed at the right connection point. The first top plate 707 can press against the pressing sleeve 501, and the second top plate 708 can press against the pressing plate 600. At the same time, a tension spring 709 is installed between the upper connection point and the lower connection point of the link mechanism 700. Both ends of the tension spring 709 can generate an inward pulling force on the upper and lower connection points of the link mechanism 700. The inward pulling force described here refers to the pulling force towards the geometric center of the link mechanism 700.

[0061] Furthermore, in an embodiment of the present invention, a threaded hole 601 is formed in the pressing plate 600. An adjusting bolt 602 is installed in the threaded hole 601. The second top plate 708 can extend into the threaded hole 601 and press against a compression spring 603 disposed between the second top plate 708 and the adjusting bolt 602.

[0062] In this embodiment, a first top plate 707 is installed at the left connection point of the link mechanism 700, and a second top plate 708 is installed at the right connection point. The first top plate 707 can press against the compression sleeve 501, and the second top plate 708 can press against the compression spring 603 disposed between the second top plate 708 and the adjusting bolt 602.

[0063] According to Figure 1 and Figure 2 In terms of the specific working process, the tension spring 709 generates a downward pulling force on the upper connection point of the link mechanism 700. After decomposing this pulling force to the fourth link 704, a horizontally leftward pulling force can be generated on the fourth link 704. The tension spring 709 generates an upward pulling force on the lower connection point of the link mechanism 700. After decomposing this pulling force to the third link 703, a horizontally leftward pulling force can be generated on the third link 703. Thus, a horizontally leftward pulling force is generated on the first top plate 707.

[0064] Similarly, the tension spring 709 generates a downward pulling force on the upper connection point of the link mechanism 700. After decomposing this pulling force to the first link 701, a horizontally rightward pulling force can be generated on the first link 701. The tension spring 709 generates an upward pulling force on the lower connection point of the link mechanism 700. After decomposing this pulling force to the second link 702, a horizontally rightward pulling force can be generated on the second link 702. Thus, a horizontally rightward pulling force is generated on the second top plate 708.

[0065] When there is a gap in the connection between the bucket and the stick 200, the first top plate 707 can push the compression sleeve 501 to move leftward so that the bucket and the stick 200 are tightly connected. At the same time, the first slider 705 and the second slider 706 will also move leftward along the first chute and the second chute respectively. When the bucket and the stick 200 are in a tightly connected state, the link mechanism 700 remains stationary.

[0066] By providing the compression spring 603 and the adjusting bolt 602 at the right end of the second top plate 708, on the one hand, the locking position of the link mechanism 700 can be assisted in adjusting through the adjusting bolt 602. On the other hand, the adjusting range of the link mechanism 700 can also be changed through the adjusting bolt 602 and the compression spring 603. That is, the self-adaptive compression range of the entire compression device.

[0067] According to the embodiments described above, by providing the link mechanism 700, the adjusting bolt 602, and the compression spring 603, when there is a large connection gap between the bucket and the stick 200 due to wear or other reasons, this connection mechanism can self-adaptively compress the bucket and the stick 200 to ensure the reliability of the excavator's operation. At the same time, the link mechanism 700 can self-adjust the distance for pushing the compression sleeve 501 to move so that the connection state between the bucket and the stick 200 reaches the best. It can also be said that this connection mechanism can precisely adjust the connection gap between the bucket and the stick 200.

[0068] In one embodiment of the present invention, the first sliding groove and the second sliding groove are symmetrically arranged with respect to the axis of symmetry which is the line connecting the rotation connection points of the first link 701 and the second link 702 and the rotation connection points of the third link 703 and the fourth link 704.

[0069] In other words, in terms of the angles shown in Figure 1 and Figure 2 , the first sliding groove and the second sliding groove can be symmetrically arranged along the horizontal center line of the link mechanism 700.

[0070] For another example, in one embodiment of the present invention, the first sliding groove and the second sliding groove are symmetric and inclined to each other. Moreover, the distance between the first sliding groove and the second sliding groove near the end of the pressing sleeve 501 is smaller than the distance between the first sliding groove and the second sliding groove near the end of the pressing plate 600.

[0071] Specifically, the first sliding groove and the second sliding groove can be symmetrically arranged along the horizontal center line of the link mechanism 700. Moreover, both the first sliding groove and the second sliding groove are inclined. In terms of the directions shown in Figure 1 and Figure 2 , the left end of the first sliding groove is lower than the right end of the first sliding groove. The left end of the second sliding groove is higher than the right end of the second sliding groove.

[0072] The tension spring 709 can generate a downward pulling force on the upper connection point of the link mechanism 700 and an upward pulling force on the lower connection point of the link mechanism 700. Thus, the first slider 705 has a tendency to disengage downward from the first sliding groove, and the second slider 706 has a tendency to disengage upward from the second sliding groove. During the process of the first slider 705 and the second slider 706 moving leftward, the distance between the first sliding groove and the second sliding groove is gradually reduced, which can improve the reliability of the movement of the link mechanism 700.

[0073] In one embodiment of the present invention, as shown in Figure 4 , the connecting mechanism for an excavator includes a plurality of link mechanisms 700. A plurality of threaded holes 601 are correspondingly formed on the pressing plate 600. An adjusting bolt 602 and a compression spring 603 are installed in each threaded hole 601. Each first top plate 707 presses against the pressing sleeve 501. Each second top plate 708 respectively presses against each compression spring 603.

[0074] Specifically, in one embodiment of the invention, the adjusting bolts 602 are uniformly arranged in a circular array on the pressing plate 600 with the center of the pressing plate 600 as the center point. Correspondingly, a link mechanism 700 is arranged at the installation position of each adjusting bolt 602.

[0075] With this structural arrangement, it is possible to make the forces on the bucket, the arm 200, and the connecting mechanism for the excavator more balanced. This effectively protects the bucket, the arm 200, and the connecting mechanism for the excavator. Furthermore, it extends the service life of the bucket, the arm 200, and the connecting mechanism for the excavator.

[0076] An embodiment of the second aspect of the present invention provides an excavator, which includes a bucket, an arm 200, and the connecting mechanism for the excavator as described above.

[0077] Among them, the bucket includes a connecting ear. The connecting mechanism for the excavator is installed between the connecting ear and the arm 200 to tightly connect the bucket and the arm.

[0078] Furthermore, since this excavator includes the connecting mechanism for the excavator as described above, it also has the various advantages as described above.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connecting mechanism for an excavator, characterized in that, Comprising: A pin shaft, a pin shaft fixing device and a pressing device, wherein, the pin shaft is arranged between the bucket and the stick of the excavator, the pin shaft fixing device is connected between the bucket and the pin shaft to connect the pin shaft with the bucket and the stick, and the pressing device is installed on the other side of the bucket to tightly connect the bucket and the stick; The pin shaft fixing device includes a positioning sleeve and a fastener, The stick is arranged between a first connecting ear and a second connecting ear formed on the bucket, the pin shaft passes through the first connecting ear, the stick and the second connecting ear, the positioning sleeve is sleeved outside the pin shaft and connected with the first connecting ear, the fastener passes through the positioning sleeve and the pin shaft, and the pressing device is installed at the second connecting ear; The pressing device includes a pressing sleeve, a pressing plate and a link mechanism, wherein, the pressing sleeve is arranged between the stick and the pressing plate, and the pressing sleeve can slide on the pin shaft and push the stick to move, the pressing plate is connected to the outside of the second connecting ear, and the link mechanism passes through the second connecting ear and is installed between the pressing sleeve and the pressing plate, and can push the pressing sleeve to move so as to tightly connect the stick and the bucket; A first plate body is installed between the pressing sleeve and the second connecting ear, a second plate body is installed between the pressing plate and the second connecting ear, coaxial through holes are formed in the first plate body, the second plate body and the second connecting ear, and the coaxial through holes together form a receiving cavity, and the link mechanism is installed in the receiving cavity; The link mechanism includes a first link, a second link, a third link and a fourth link, wherein, the first link, the second link, the third link and the fourth link are sequentially and rotationally connected end to end to form a rhombus structure, a first top plate is connected at the rotational connection point of the first link and the second link, and a second top plate is connected at the rotational connection point of the third link and the fourth link; A threaded hole is formed in the pressing plate, an adjusting bolt is installed in the threaded hole, and the second top plate can extend into the threaded hole and press against a compression spring arranged between the second top plate and the adjusting bolt; A first slider is installed at the rotational connection point of the first link and the fourth link, a second slider is installed at the rotational connection point of the second link and the third link, a first chute and a second chute are formed in the receiving cavity, the first slider is slidably installed in the first chute, and the second slider is slidably installed in the second chute, wherein, the first top plate can press against the pressing sleeve, and the second top plate can press against the pressing plate, and a tension spring is installed between the rotational connection point of the first link and the fourth link and the rotational connection point of the second link and the third link; The first chute and the second chute are symmetrically arranged with respect to the line connecting the rotational connection point of the first link and the second link and the rotational connection point of the third link and the fourth link as the axis of symmetry.

2. The connecting mechanism for an excavator according to claim 1, characterized in that, The connecting mechanism for the excavator includes a plurality of the link mechanisms. A plurality of the threaded holes are correspondingly formed on the pressing plate. The adjusting bolts and the compression springs are installed in each of the threaded holes. Each of the first top plates presses against the pressing sleeve, and each of the second top plates respectively presses against each of the compression springs.

3. The connecting mechanism for an excavator according to claim 1, characterized in that, The first chute and the second chute are symmetric and inclined to each other. Moreover, the distance between the first chute and the second chute near the end of the pressing sleeve is smaller than the distance between the first chute and the second chute near the end of the pressing plate.

4. An excavator, characterized in that, It includes a bucket, an arm, and the connecting mechanism for the excavator according to any one of claims 1 to 3. Wherein, the bucket includes a connecting ear, and the connecting mechanism for the excavator is installed between the connecting ear and the arm to tightly connect the bucket and the arm.

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