Double-safety hydraulic connector for excavator

Abstract

The utility model discloses a double-safety hydraulic connector for an excavator, relates to the related field of hydraulic connectors, and aims to solve the problems that an existing quick connector can not bear the weight of a connecting accessory well under the condition of only single-shaft connection, and a driving structure is redundant when two groups of oil cylinders independently drive a connecting hook to move under the condition of double-shaft connection. A connecting rod assembly is arranged on one side between the two side plate bodies, an outer linkage rod is rotationally connected to the outer portion of the second pin shaft along the inner end of the side linkage rod, and the other end of the outer linkage rod is rotationally connected with a limiting assembly. A round-head pin shaft is slidably connected into the outer connecting piece and the fixing plate, and a pressure spring is arranged between the round head portion of the round-head pin shaft and the fixing plate along the outer portion of the round rod portion of the round-head pin shaft. The first shaft sleeve is externally connected with a double-lock oil cylinder; and a rear hook assembly is arranged on the other side between the side plate main bodies.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic connectors, and particularly relates to a double - safety hydraulic connector for an excavator. Background Technique

[0002] With the development of modern society, the construction of various buildings has increased, the mechanical operation range of excavators has expanded, and the tools of excavators have become more and more diverse. The quick coupler of the excavator can realize the quick replacement of operation workpieces, save working time and improve work efficiency.

[0003] The quick coupler of the excavator, also known as a quick - change joint, can quickly install various configuration accessories such as a bucket, a ripper, a breaker, a hydraulic shear, a grapple, a stone grabber, etc. on the excavator, can expand the use range of the excavator, and can save time and improve work efficiency. The safety - type hydraulic quick - change joint mainly relies on the action of the oil cylinder to fix and release the pin shaft. When it is necessary to replace the working part, the oil cylinder retracts, and the hook - shaped pressure block moves from position 1 to position 2, and the connecting accessory disengages from the quick - change joint. After changing to other working parts, after the hook - shaped pressure block aligns with the pin shaft, the oil cylinder is opened again, and the hook - shaped pressure block moves from position 2 to position 1 to lock the shaft of the connecting accessory.

[0004] At present, in the quick coupler, the oil cylinder is hinged to the body, the piston rod of the oil cylinder is hinged to the movable hook, and the piston rod of the oil cylinder drives the movable hook to open and close to fix or release the connecting accessory. However, under the single - shaft connection, the coupler cannot well bear the weight of the connecting accessory. Under the double - shaft connection, there is a situation of redundant drive structure when two groups of oil cylinders independently drive the connecting hook to move. Content of the Utility Model

[0005] The purpose of the utility model is to provide a double - safety hydraulic connector for an excavator to solve the problems in the above - mentioned background technique that under the single - shaft connection of the current quick coupler, the coupler cannot well bear the weight of the connecting accessory, and under the double - shaft connection, there is a situation of redundant drive structure when two groups of oil cylinders independently drive the connecting hook to move.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A double - safety hydraulic connector for an excavator, including a welded - together housing assembly. The welded - together housing assembly includes a first side plate and a second side plate. The first side plate and the second side plate have the same shape and are structurally symmetrical. Both the first side plate and the second side plate include ear plates. On both sides between the two ear plates, a first welding shaft assembly and a second welding shaft assembly are respectively arranged. The outer shaft sleeve of one of the ear plates is locked to both the first welding shaft assembly and the second welding shaft assembly through bolts and nuts.

[0007] At the lower end of the outer end of the upper - side plate body of the first side plate and the second side plate, a backing plate is welded and fixed. At the lower end of the outer end of the backing plate, a side - plate body is welded and fixed.

[0008] A first pin shaft is rotatably connected to the lower ends between the two side plate bodies. A link assembly is arranged on one side between the two side plate bodies. The link assembly includes two symmetrically arranged side link rods. Each side link rod includes an intermediate connecting portion and an outer connecting portion. The intermediate connecting portion is integrally connected between the two outer connecting portions. One of the outer connecting portions on the two side link rods is rotatably connected to the first pin shaft. A second pin shaft is rotatably connected between the other outer connecting portions on the two side link rods. An outer link rod is rotatably connected to the outside of the second pin shaft along the inner end of the side link rod. The other end of the outer link rod is rotatably connected to a limiting assembly;

[0009] A fixing plate is fixed to the upper end of the middle of the inner end of the side plate body. An outer connecting piece is fixed to the outer end of the fixing plate by bolts. A round head pin shaft is slidably connected between the outer connecting piece and the fixing plate. A compression spring is arranged between the round head portion of the round head pin shaft and the fixing plate along the outside of the round rod portion of the round head pin shaft. The round head portion of the round head pin shaft is in contact with the intermediate connecting portion;

[0010] A first bushing is rotatably connected to the outside of the second pin shaft between the two outer link rods. A double-lock oil cylinder is connected to the outside of the first bushing. The output rod end of the double-lock oil cylinder is connected to a second bushing;

[0011] A rear hook assembly is arranged on the other side between the side plate bodies. The rear hook assembly includes a rear hook body. A rear hook reinforcing block is fixed to the outside between the two rear hook bodies. A third bushing is fixed to the inside between the two rear hook bodies. A fifth pin shaft is rotatably connected in the third bushing. Both ends of the fifth pin shaft extend outwards to be connected to the side plate body. A sixth pin shaft is arranged in the middle between the two rear hook bodies. The second bushing is located outside the sixth pin shaft.

[0012] Preferably, a second inner attaching plate is arranged on one side of the inner end of the side plate body. A front groove is formed between the side plate body and the second inner attaching plate. A second front connecting plate is welded and fixed along the outside of the front groove between the two second inner attaching plates. A first front connecting plate is welded and fixed along the upper ends of the link assembly, the limiting assembly and the outer link rod between the two side plate bodies.

[0013] Preferably, a first inner attaching plate is arranged on the other side of the inner end of the side plate body. The lower end surfaces of the side plate body and the first inner attaching plate are arranged as rear grooves.

[0014] Preferably, a baffle is fixed along one side of the fixing plate at the upper end of the middle of the inner end of the side plate body.

[0015] Preferably, the limiting component includes a limiting bottom plate and limiting side plates. The limiting bottom plate is fixed to the outer side between the two limiting side plates. The upper outer end surface of the limiting side plates is set as an arc surface. A limiting reinforcing rib is fixed along one end of the limiting bottom plate on the side away from the arc surface between the two limiting side plates.

[0016] Preferably, the limiting component is rotatably connected to the first side plate and the second side plate through a third pin shaft. The third pin shaft is located on the side of the two limiting side plates close to the arc surface. The two limiting side plates and the two outer linkage rods are both rotatably connected through a fourth pin shaft.

[0017] Preferably, a second outer attaching plate is arranged along the outer end of the first inner attaching plate at the outer end of the side plate body of the first side plate and the second side plate. The second outer attaching plate has the same shape as the first inner attaching plate. A first outer attaching plate is arranged along the outer end of the second inner attaching plate at the outer end of the side plate body of the first side plate and the second side plate. The first outer attaching plate has the same shape as the second inner attaching plate. A rear connecting plate is fixedly welded to the outer sides of the first side plate and the second side plate away from the first front connecting plate and the second front connecting plate.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. In this utility model, the driving of the double-lock oil cylinder will cause the limiting component and the rear hook component to move. When the output rod of the double-lock oil cylinder extends, it pushes the rear hook component to rotate and latch the bucket shaft in the rear groove. The double-lock oil cylinder itself rotates to drive the link component to rotate. Under the action of the round head pin shaft and the compression spring, the link component abuts against the second inner attaching plate of the welded housing component. The outer linkage rod rotates to push the limiting component to move outwards. The shortest distance between the lower surface of the limiting component and the tip of the front groove is less than the diameter of the bucket shaft, thereby restricting the bucket shaft from sliding out of the front groove. The locking of the two bucket shafts is achieved through the action of one double-lock oil cylinder. The locking of the two bucket shafts provides double safety guarantees for the quick connector and the connecting accessory, solving the problems that in the current quick connector with only single-axis connection, the connector cannot well bear the weight of the connecting accessory, and in the case of double-axis connection, there is a redundant driving structure when two groups of oil cylinders independently drive the connecting hook to move.

[0020] 2. In this utility model, when the double-lock oil cylinder fails to drive its output rod normally under the state of connecting the attachment, since the middle connecting part on the connecting rod assembly contacts the round head part of the round head pin shaft, the connecting rod assembly is close to the second inner attaching plate of the welded shell assembly under the action of the round head pin shaft and the compression spring. The connecting rod assembly will not displace or rotate, the outer linkage rod coaxially connected to the connecting rod assembly by the second pin shaft will not have a movement tendency, the limiting assembly maintains its original posture, and can limit the bucket shaft from sliding out of the front groove. There is always a connection and locking relationship between the connecting attachment and this connector, which can solve the problem that after the connecting attachment is fixedly connected at present, during the use of the excavator, once the oil cylinder fails, the movement of the piston rod is out of control, the connecting attachment may fall off, the connecting attachment will be damaged or scrapped, and even cause serious casualties. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 6 is a schematic diagram of the overall structure of a double-safe hydraulic connector for an excavator according to the present utility model;

[0022] Figure 2 FIG. 10 is a schematic diagram of the bottom view structure of a double-safe hydraulic connector for an excavator according to the present utility model after removing the connecting rod assembly;

[0023] Figure 3 FIG. 14 is a schematic diagram of the internal structure of a double-safe hydraulic connector for an excavator according to the present utility model;

[0024] Figure 4 FIG. 18 is a schematic diagram of the structure of the welded shell assembly of a double-safe hydraulic connector for an excavator according to the present utility model;

[0025] Figure 5 FIG. 22 is a schematic diagram of the bottom view structure of the welded shell assembly of a double-safe hydraulic connector for an excavator according to the present utility model;

[0026] Figure 6 FIG. 26 is a schematic diagram of the outer side surface structure of the first side plate and the second side plate of a double-safe hydraulic connector for an excavator according to the present utility model;

[0027] Figure 7 FIG. 30 is a schematic diagram of the inner side surface structure of the first side plate and the second side plate of a double-safe hydraulic connector for an excavator according to the present utility model;

[0028] Figure 8 FIG. 34 is a schematic diagram of the structure of the rear hook assembly of a double-safe hydraulic connector for an excavator according to the present utility model;

[0029] Figure 9 FIG. 38 is a schematic diagram of the structure of the limiting assembly of a double-safe hydraulic connector for an excavator according to the present utility model;

[0030] Figure 10Schematic diagram of the retracted state of the output rod of the double-lock cylinder of a double-safe hydraulic connector for an excavator according to the present utility model;

[0031] Figure 11 Schematic diagram of the extended state of the output rod of the double-lock cylinder of a double-safe hydraulic connector for an excavator according to the present utility model.

[0032] In the figure: 1, welded shell assembly; 2, first side plate; 3, second side plate; 4, side plate main body; 5, ear plate; 6, backing plate; 7, first inner attaching plate; 8, second inner attaching plate; 9, first outer attaching plate; 10, second outer attaching plate; 11, front groove; 12, rear groove; 13, first front connecting plate; 14, second front connecting plate; 15, rear connecting plate; 16, baffle; 17, fixing plate; 18, first welding shaft assembly; 19, second welding shaft assembly; 20, first pin shaft; 21, connecting rod assembly; 22, side linkage rod; 23, intermediate connecting part; 24, outer connecting part; 25, second pin shaft; 26, first bushing; 27, double-lock cylinder; 28, second bushing; 29, outer linkage rod; 30, limiting assembly; 31, limiting bottom plate; 32, limiting side plate; 33, limiting reinforcing rib; 34, third pin shaft; 35, fourth pin shaft; 36, outer connecting piece; 37, round head pin shaft; 38, pressure spring; 39, rear hook assembly; 40, rear hook main body; 41, rear hook reinforcing block; 42, third bushing; 43, fifth pin shaft; 44, sixth pin shaft. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0034] Please refer to Figures 1-11 , an embodiment provided by the present utility model: a double-safe hydraulic connector for an excavator, including a welded shell assembly 1. The welded shell assembly 1 includes a first side plate 2 and a second side plate 3. The first side plate 2 and the second side plate 3 have the same shape and are symmetrically structured. Both the first side plate 2 and the second side plate 3 include ear plates 5. On both sides between the two ear plates 5, a first welding shaft assembly 18 and a second welding shaft assembly 19 are respectively arranged. The outer bushing of one of the ear plates 5 is locked with both the first welding shaft assembly 18 and the second welding shaft assembly 19 through bolts and nuts, so as to realize the installation at the connection position with the excavator's forearm;

[0035] At the lower end of the outer end of the side plate main body 4 of the first side plate 2 and the second side plate 3, a backing plate 6 is welded and fixed. At the lower end of the outer end of the backing plate 6, the side plate main body 4 is welded and fixed;

[0036] A first pin shaft 20 is rotatably connected to the lower ends between two side plate bodies 4. A connecting rod assembly 21 is arranged on one side between the two side plate bodies 4. The connecting rod assembly 21 includes two symmetrically arranged side linkage rods 22. The side linkage rod 22 includes an intermediate connecting portion 23 and an outer connecting portion 24. The intermediate connecting portion 23 is integrally connected between the two outer connecting portions 24. One of the outer connecting portions 24 on the two side linkage rods 22 is rotatably connected to the first pin shaft 20. A second pin shaft 25 is rotatably connected between the other outer connecting portions 24 on the two side linkage rods 22. The rotation axis of the connecting rod assembly 21 is the first pin shaft 20. An outer linkage rod 29 is rotatably connected to the outside of the second pin shaft 25 along the inner end of the side linkage rod 22. The rotation axis of the outer linkage rod 29 is the second pin shaft 25. The other end of the outer linkage rod 29 is rotatably connected to a limiting component 30. The limiting component 30 includes a limiting bottom plate 31 and limiting side plates 32. The limiting bottom plate 31 is fixed to the outside between the two limiting side plates 32. The upper outer end face of the limiting side plate 32 is set as an arc surface. A limiting reinforcing rib 33 is fixed along one end of the limiting bottom plate 31 on the side away from the arc surface between the two limiting side plates 32 to enhance the strength of the limiting component 30 itself. The limiting component 30 is rotatably connected to the first side plate 2 and the second side plate 3 through a third pin shaft 34. The third pin shaft 34 is located on the side of the two limiting side plates 32 close to the arc surface. The two limiting side plates 32 and the two outer linkage rods 29 are all rotatably connected through a fourth pin shaft 35;

[0037] An inner fixing plate 17 is fixed to the upper end of the middle of the inner end of the side plate body 4. An outer connecting piece 36 is fixed to the outer end of the fixing plate 17 through a bolt. A round head pin shaft 37 is slidably connected between the outer connecting piece 36 and the fixing plate 17. A compression spring 38 is arranged between the round head portion of the round head pin shaft 37 and the fixing plate 17 along the outer part of the round rod portion of the round head pin shaft 37. The round head portion of the round head pin shaft 37 is in contact with the intermediate connecting portion 23. During the elongation process of the output rod of the double-lock oil cylinder 27, the double-lock oil cylinder 27 itself will rotate and drive the connecting rod assembly 21 to rotate. Since the intermediate connecting portion 23 on the connecting rod assembly 21 contacts the round head portion of the round head pin shaft 37, the connecting rod assembly 21 abuts against the second inner attaching plate 8 of the welded shell assembly 1 under the action of the round head pin shaft 37 and the compression spring 38;

[0038] A first bushing 26 is rotatably connected to the outside of the second pin shaft 25 between the two outer linkage rods 29. The first bushing 26 is externally connected to a double-lock oil cylinder 27. The output rod end of the double-lock oil cylinder 27 is connected to a second bushing 28;

[0039] On the other side between the side plate bodies 4, a rear hook assembly 39 is provided. The rear hook assembly 39 includes a rear hook body 40. A rear hook reinforcement block 41 is fixed on the outer side between the two rear hook bodies 40. A third bushing 42 is fixed on the inner side between the two rear hook bodies 40. A fifth pin shaft 43 is rotatably connected inside the third bushing 42. The rotating shaft of the rear hook assembly 39 is the fifth pin shaft 43. The two ends of the fifth pin shaft 43 extend outwards to be connected with the side plate body 4. A sixth pin shaft 44 is arranged in the middle between the two rear hook bodies 40. The second bushing 28 is located outside the sixth pin shaft 44. At the upper end along one side of the fixed plate 17 in the middle of the inner end of the side plate body 4, a baffle 16 is fixed. When the output rod of the double-lock oil cylinder 27 retracts, it pulls the rear hook assembly 39 to rotate until the rear hook body 40 on the rear hook assembly 39 contacts the baffle 16 of the welded shell assembly 1 and then stops. The rear groove 12 opens when the rear hook assembly 39 rotates.

[0040] A grease nipple is provided at the front end of the main pin shaft, and grease is applied regularly for maintenance; gaskets and elastics are arranged at the rotating positions of each pin shaft.

[0041] Furthermore, a second inner attachment plate 8 is arranged on one side of the inner end of the side plate body 4. A front groove 11 is formed between the side plate body 4 and the second inner attachment plate 8. A second front connecting plate 14 is welded and fixed along the outside of the front groove 11 between the two second inner attachment plates 8. A first front connecting plate 13 is welded and fixed along the upper ends of the connecting rod assembly 21, the limiting assembly 30, and the outer linkage rod 29 between the two side plate bodies 4. The upper outer end face of the limiting side plate 32 is set as an arc surface, so that it rotates at the lower end of the first front connecting plate 13 without structural interference in movement; on the other side of the inner end of the side plate body 4, a first inner attachment plate 7 is arranged. The lower end faces of the side plate body 4 and the first inner attachment plate 7 are set as a rear groove 12.

[0042] Furthermore, on the outer ends of the side plate bodies 4 on the first side plate 2 and the second side plate 3, a second outer attachment plate 10 is arranged along the outer end of the first inner attachment plate 7. The second outer attachment plate 10 has the same shape as the first inner attachment plate 7. On the outer ends of the side plate bodies 4 on the first side plate 2 and the second side plate 3, a first outer attachment plate 9 is arranged along the outer end of the second inner attachment plate 8. The first outer attachment plate 9 has the same shape as the second inner attachment plate 8. A rear connecting plate 15 is welded and fixed on the outer sides of the first side plate 2 and the second side plate 3, away from the first front connecting plate 13 and the second front connecting plate 14.

[0043] When it is necessary to unlock the connection attachment, the output rod of the double-lock oil cylinder 27 retracts.

[0044] 1.1 Since both ends of the double-lock cylinder 27 are rotatably connected to the second pin shaft 25 and the sixth pin shaft 44 through the first bushing 26 and the second bushing 28, the double-lock cylinder 27 itself will rotate. The connecting rod assembly 21 starts to rotate under the drive of the double-lock cylinder 27 against the spring force of the compression spring 38. Due to the connection relationship between the connecting rod assembly 21 and the outer linkage rod 29 which is rotatably connected through the second pin shaft 25, the limiting assembly 30 is driven to rotate. Due to the connection relationship between the third pin shaft 34 on the limiting assembly 30 and the first side plate 2 and the second side plate 3, the limiting assembly 30 rotates around the third pin shaft 34 as the center, and the front groove 11 opens. During the rotation, when the force generated by the connecting rod assembly 21 pushing the round head pin shaft 37 balances the spring force of the compression spring 38, the connecting rod assembly 21 and the limiting assembly 30 stop rotating.

[0045] 1.2 Since both ends of the double-lock cylinder 27 are rotatably connected to the second pin shaft 25 and the sixth pin shaft 44 through the first bushing 26 and the second bushing 28, when the output rod of the double-lock cylinder 27 retracts, it pulls the rear hook assembly 39 to rotate until the rear hook body 40 on the rear hook assembly 39 contacts the baffle 16 of the welded housing assembly 1 and then stops. The rear groove 12 opens when the rear hook assembly 39 rotates.

[0046] Then, the bucket shaft is successively inserted into the front groove 11 and the rear groove 12 under the connector.

[0047] 2 When it is necessary to connect the connecting accessory, the output rod of the double-lock cylinder 27 extends.

[0048] 2.1 During the extension of the output rod of the double-lock cylinder 27, since both ends of the double-lock cylinder 27 are rotatably connected to the second pin shaft 25 and the sixth pin shaft 44 through the first bushing 26 and the second bushing 28, when the output rod of the double-lock cylinder 27 extends, it pushes the rear hook assembly 39 to rotate and catches the bucket shaft in the rear groove 12.

[0049] 2.2 During the extension of the output rod of the double-lock cylinder 27, since both ends of the double-lock cylinder 27 are rotatably connected to the second pin shaft 25 and the sixth pin shaft 44 through the first bushing 26 and the second bushing 28, the double-lock cylinder 27 itself will rotate and drive the connecting rod assembly 21 to rotate. Since the middle connecting part 23 on the connecting rod assembly 21 contacts the round head of the round head pin shaft 37, the connecting rod assembly 21 abuts against the second inner attaching plate 8 of the welded housing assembly 1 under the action of the round head pin shaft 37 and the compression spring 38. The outer linkage rod 29 coaxially connected to the connecting rod assembly 21 through the second pin shaft 25 rotates and pushes the limiting assembly 30 to move outwards. The limiting assembly 30 rotates around the third pin shaft 34 as the center. When the surface where the short arc side of the limiting assembly 30 contacts the lower surface of the first front connecting plate 13 of the welded housing assembly 1, the limiting assembly 30 stops rotating. At this time, the shortest distance between the lower surface of the limiting assembly 30 and the tip of the front groove 11 is less than the diameter of the bucket shaft, thereby restricting the bucket shaft from sliding out of the front groove 11.

[0050] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A double - safety hydraulic connector for an excavator, comprising a welded housing assembly (1). The welded housing assembly (1) includes a first side plate (2) and a second side plate (3). The first side plate (2) and the second side plate (3) have the same shape and are structurally symmetric. Both the first side plate (2) and the second side plate (3) include ear plates (5). On both sides between the two ear plates (5), a first welding shaft assembly (18) and a second welding shaft assembly (19) are respectively arranged. The outer shaft sleeve of one of the ear plates (5) is locked with both the first welding shaft assembly (18) and the second welding shaft assembly (19) through bolts and nuts. It is characterized in that: At the lower end of the outer end of the upper - side plate body (4) of the first side plate (2) and the second side plate (3), a backing plate (6) is welded and fixed. At the lower end of the outer end of the backing plate (6), the side - plate body (4) is welded and fixed. A first pin shaft (20) is rotatably connected to the lower ends between the two side - plate bodies (4). A connecting - rod assembly (21) is arranged on one side between the two side - plate bodies (4). The connecting - rod assembly (21) includes two symmetrically arranged side - linkage rods (22). The side - linkage rod (22) includes an intermediate connecting part (23) and an outer connecting part (24). The intermediate connecting part (23) is integrally connected between the two outer connecting parts (24). One of the outer connecting parts (24) on the two side - linkage rods (22) is rotatably connected to the first pin shaft (20). A second pin shaft (25) is rotatably connected between the other outer connecting parts (24) on the two side - linkage rods (22). An outer - linkage rod (29) is rotatably connected to the outer part of the second pin shaft (25) along the inner end of the side - linkage rod (22). The other end of the outer - linkage rod (29) is rotatably connected to a limiting assembly (30). At the upper end of the middle of the inner end of the side - plate body (4), a fixing plate (17) is fixed. An outer connecting piece (36) is fixed to the outer end of the fixing plate (17) through bolts. A round - head pin shaft (37) is slidably connected between the outer connecting piece (36) and the fixing plate (17). A compression spring (38) is arranged between the round - head part of the round - head pin shaft (37) and the fixing plate (17) along the outer part of the round rod part of the round - head pin shaft (37). The round - head part of the round - head pin shaft (37) is in contact with the intermediate connecting part (23). A first shaft sleeve (26) is rotatably connected to the outer part of the second pin shaft (25) between the two outer - linkage rods (29). A double - lock oil cylinder (27) is connected to the outer part of the first shaft sleeve (26). The output rod end of the double - lock oil cylinder (27) is connected to a second shaft sleeve (28). On the other side between the side plate bodies (4), a rear hook assembly (39) is provided. The rear hook assembly (39) includes a rear hook body (40). A rear hook reinforcing block (41) is fixed on the outer side between the two rear hook bodies (40). A third bushing (42) is fixed on the inner side between the two rear hook bodies (40). A fifth pin shaft (43) is rotatably connected inside the third bushing (42). Both ends of the fifth pin shaft (43) extend outwards to be connected with the side plate body (4). A sixth pin shaft (44) is arranged in the middle between the two rear hook bodies (40). The second bushing (28) is located outside the sixth pin shaft (44).

2. The double safety hydraulic connector for an excavator according to claim 1, characterized in that: On one side of the inner end of the side plate body (4), a second inner attachment plate (8) is provided. A front groove (11) is formed between the side plate body (4) and the second inner attachment plate (8). A second front connecting plate (14) is fixedly welded along the outside of the front groove (11) between the two second inner attachment plates (8). A first front connecting plate (13) is fixedly welded along the upper ends of the link assembly (21), the limit assembly (30), and the outer linkage rod (29) between the two side plate bodies (4).

3. The double safety hydraulic connector for an excavator according to claim 2, characterized in that: On the other side of the inner end of the side plate body (4), a first inner attachment plate (7) is provided. The lower end surfaces of the side plate body (4) and the first inner attachment plate (7) are provided as a rear groove (12).

4. A double safety hydraulic connector for an excavator according to claim 1, characterized in that: On one side of the upper end in the middle of the inner end of the side plate body (4), a baffle (16) is fixed along one side of the fixing plate (17).

5. The double safety hydraulic connector for an excavator according to claim 1, wherein: The limit assembly (30) includes a limit bottom plate (31) and limit side plates (32). The limit bottom plate (31) is fixed on the outer side between the two limit side plates (32). The outer end surface of the upper end of the limit side plate (32) is provided as an arc surface. A limit reinforcing rib (33) is fixed along one end of the limit bottom plate (31) on the side away from the arc surface between the two limit side plates (32).

6. The double safety hydraulic connector for an excavator according to claim 5, wherein: The limit assembly (30) is rotatably connected to the first side plate (2) and the second side plate (3) through a third pin shaft (34). The third pin shaft (34) is located on the side close to the arc surface of the two limit side plates (32). The two limit side plates (32) and the two outer linkage rods (29) are both rotatably connected through a fourth pin shaft (35).

7. The double safety hydraulic connector for an excavator according to claim 3, characterized in that: On the outer ends of the side plate bodies (4) on the first side plate (2) and the second side plate (3), a second outer attachment plate (10) is provided along the outer end of the first inner attachment plate (7). The second outer attachment plate (10) has the same shape as the first inner attachment plate (7). On the outer ends of the side plate bodies (4) on the first side plate (2) and the second side plate (3), a first outer attachment plate (9) is provided along the outer end of the second inner attachment plate (8). The first outer attachment plate (9) has the same shape as the second inner attachment plate (8). A rear connecting plate (15) is fixedly welded on the outer sides of the first side plate (2) and the second side plate (3) on the side away from the first front connecting plate (13) and the second front connecting plate (14).

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