A bolt compression structure with a boom overload protection function

Abstract

This invention relates to the field of engineering machinery technology, specifically to a bolt clamping structure with overload protection function for the boom. The structure includes a bucket cylinder, the output end of which is connected to a connecting rod and a rocker arm via a pin. An inner fixing sleeve is fitted onto the pin, and an outer fixing sleeve is installed at the end of the pin. The pin is also connected to a bolt located between the inner and outer fixing sleeves. An outer clamping post is installed on the outer fixing sleeve, and its end has an outer clamping groove adapted to the side of the bolt. An outer reset device is installed between the outer clamping post and the outer fixing sleeve. An inner clamping post is installed on the inner fixing sleeve, and its end has an inner clamping groove adapted to the side of the bolt. An inner reset device is installed between the inner clamping post and the inner fixing sleeve. This structure provides overload protection for the bolt.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to a bolt clamping structure with boom overload protection function. Background Technology

[0002] The existing excavator has a bucket installed at the front end of the boom, and a bucket cylinder is installed on the boom. The output end of the bucket cylinder is hinged to a connecting rod and a rocker arm via a pin. The pin is fixed to the rocker arm with a fixing sleeve and cannot rotate relative to it.

[0003] The above technical solution has the following disadvantages: when the thrust of the bucket cylinder is too large during actual excavation, it cannot provide overload protection for the boom structure, nor can it effectively identify overload work. Long-term overload work will cause the pin bolts to break, the connecting rods and rocker arms to crack, and even the front part of the boom to crack directly, which seriously affects the excavator's operation and causes serious economic losses. Summary of the Invention

[0004] The purpose of this invention is to provide a bolt clamping structure with overload protection function for the boom, which provides overload protection for the pin bolts.

[0005] To achieve the above objectives, this invention discloses a bolt clamping structure with stick overload protection function. The structure includes a bucket cylinder, the output end of which is connected to a connecting rod and a rocker arm via a pin. An inner fixing sleeve is fitted onto the pin, and an outer fixing sleeve is installed at the end of the pin. The pin is also connected to a pin bolt located between the inner and outer fixing sleeves. An outer clamping post is installed on the outer fixing sleeve, and its end has an outer clamping groove adapted to the side of the pin bolt. An outer reset device is installed between the outer clamping post and the outer fixing sleeve. An inner clamping post is installed on the inner fixing sleeve, and its end has an inner clamping groove adapted to the side of the pin bolt. An inner reset device is installed between the inner clamping post and the inner fixing sleeve.

[0006] During normal operation, the outer and inner clamping columns restrict the rotation of the pin bolts.

[0007] When the thrust of the bucket cylinder is too high, the pin and pin bolt tend to rotate. The outer and inner reset devices are compressed, and the outer and inner clamping columns slide. The pin bolt rotates out from between the outer and inner clamping columns, providing overload protection for the pin bolt and effectively identifying overload operation. It also protects the boom structure, effectively preventing cracking caused by prolonged overload operation and avoiding serious economic losses.

[0008] Preferably, the outer fixing sleeve has an outer stepped hole, an outer connecting plate is installed in the larger hole of the outer stepped hole, an outer clamping post is located in the smaller hole of the outer stepped hole, and the outer reset device includes an outer clamping spring located between the outer clamping post and the outer connecting plate. The inner fixing sleeve has an inner stepped hole, an inner connecting plate is installed in the larger hole of the inner stepped hole, an inner clamping post is located in the smaller hole of the inner stepped hole, and the reset device includes an inner clamping spring located between the inner clamping post and the inner connecting plate.

[0009] When the thrust of the bucket cylinder is too large, the pin and pin bolt tend to rotate, the outer and inner clamping springs are compressed, the outer and inner clamping columns slide, and the pin bolt rotates out from the outer and inner clamping columns, thus providing overload protection for the pin bolt.

[0010] Preferably, an outer connecting rod is connected to the outer clamping column, and an outer connecting rod protrusion is connected to the side of the outer connecting rod. An outer connecting pipe is connected to the outer connecting plate, and the end of the outer connecting pipe has an outer connecting rod hole and an outer connecting rod protrusion through hole. The inner diameter of the outer connecting pipe is larger than the diameter of the outer connecting rod hole. An inner connecting rod is connected to the inner clamping column, and an inner connecting rod protrusion is connected to the side of the inner connecting rod. An inner connecting pipe is connected to the inner connecting plate, and the inner connecting pipe has an inner connecting rod hole and an inner connecting rod protrusion through hole. The inner diameter of the inner connecting pipe is larger than the diameter of the inner connecting rod hole.

[0011] In use, insert the outer connecting rod into the outer connecting tube through the outer connecting rod hole, and then rotate the outer connecting rod to misalign the outer connecting rod protrusion with the outer connecting rod protrusion through hole, thus connecting the outer connecting rod to the outer connecting tube; insert the inner connecting rod into the inner connecting tube through the inner connecting rod hole, and then rotate the inner connecting rod to misalign the inner connecting rod protrusion with the inner connecting tube, thus connecting the inner connecting rod to the inner connecting tube.

[0012] Preferably, the outer compression spring is sleeved on the outer connecting pipe, and the inner compression spring is sleeved on the inner connecting pipe.

[0013] During use, the outer and inner compression springs extend and retract stably.

[0014] Preferably, the external connecting bolt passes through the external connecting plate and is threadedly connected to the external fixing sleeve.

[0015] This structure uses external connecting bolts to install the external connecting plate, which facilitates the disassembly of the external connecting plate.

[0016] Preferably, the outer end of the outer fixing sleeve is closed, and the outer fixing bolt passes through the outer end of the outer fixing sleeve and is threadedly connected to the pin.

[0017] This structure uses external fixing bolts to install the external fixing sleeve, which facilitates the removal of the external fixing sleeve.

[0018] Preferably, the pin bolt passes through the pin and is threaded into the nut.

[0019] This structure facilitates the removal of the pin bolts.

[0020] Preferably, there are two outer clamping pins, which are located on both sides of the pin shaft, and two inner clamping pins, which are located on both sides of the pin shaft.

[0021] The pins and bolts in this structure are in a state of force balance.

[0022] In summary, the beneficial effects of this invention are as follows: During normal operation, the outer and inner clamping columns restrict the rotation of the pin bolt. When the thrust of the bucket cylinder is too large, the pin and pin bolt tend to rotate, the outer and inner reset devices are compressed, the outer and inner clamping columns slide, and the pin bolt rotates out from the outer and inner clamping columns, thus providing overload protection for the pin bolt and effectively identifying overload operation; it also protects the boom structure, effectively avoiding cracking caused by prolonged overload operation and preventing serious economic losses. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a bolt clamping structure with boom overload protection function according to the present invention;

[0024] Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle;

[0025] Figure 3 yes Figure 2 Schematic diagram of the mid-section BB;

[0026] Figure 4 This is a schematic diagram of the outer clamping column in a bolt clamping structure with boom overload protection function according to the present invention;

[0027] Figure 5 This is a schematic diagram of the inner clamping column in a bolt clamping structure with boom overload protection function according to the present invention;

[0028] Figure 6 This is a schematic diagram of the outer fixing sleeve in a bolt clamping structure with boom overload protection function according to the present invention;

[0029] Figure 7 This is a schematic diagram of the inner fixing sleeve in a bolt clamping structure with boom overload protection function according to the present invention;

[0030] Figure 8 This is a three-dimensional structural diagram of a bolt clamping structure with boom overload protection function according to the present invention;

[0031] Figure 9 yes Figure 8 A magnified structural diagram of part C in the middle;

[0032] Figure 10This is a structural diagram of the background technology.

[0033] In the diagram: 1. Stick; 2. Bucket; 3. Bucket cylinder; 4. Connecting rod; 5. Rocker arm; 6. Outer fixing sleeve; 7. Outer fixing bolt; 8. Outer connecting plate; 9. Outer connecting bolt; 10. Pin bolt; 11. Nut; 12. Pin; 13. Outer clamping column; 14. Outer clamping spring; 15. Inner fixing sleeve; 16. Inner connecting plate; 17. Inner clamping column; 18. Inner clamping spring; 19. Outer connecting rod; 20. Outer connecting rod protrusion; 21. Outer connecting pipe; 22. Outer connecting rod hole; 23. Outer connecting rod protrusion through hole; 24. Clamping groove; 25. Inner connecting rod; 26. Inner connecting rod protrusion; 27. Inner connecting pipe; 28. Inner connecting rod hole; 29. ​​Inner connecting rod protrusion through hole; 30. Inner clamping groove; 31. Outer stepped hole; 32. Inner stepped hole. Detailed Implementation

[0034] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0039] like Figure 10 As shown, the existing excavator has a bucket 2 installed at the front end of the boom 1, and a bucket cylinder 3 installed on the boom 1. The output end of the bucket cylinder 3 is hinged to a connecting rod 4 and a rocker arm 5 via a pin 12. The pin bolt 10 is fixed to the rocker arm with a fixing sleeve and cannot rotate relative to it. When the thrust of the bucket cylinder 3 is too large during actual excavation, it cannot provide overload protection for the boom 1 structure, nor can it effectively identify overload work. Long-term overload work will cause the pin bolt 10 to break, the connecting rod 4 and the rocker arm 5 to crack, and even worse, the front part of the boom 1 may crack directly, seriously affecting the excavator's operation and causing serious economic losses.

[0040] like Figures 1 to 9 As shown, a bolt clamping structure with stick overload protection function includes a bucket cylinder 3. The output end of the bucket cylinder 3 is connected to a connecting rod 4 and a rocker arm 5 via a pin 12. The structure is characterized in that an inner fixing sleeve 15 is sleeved on the pin 12, an outer fixing sleeve 6 is installed at the end of the pin 12, and the pin 12 is also connected to a pin bolt 10 located between the inner fixing sleeve 15 and the outer fixing sleeve 6.

[0041] An external clamping column 13 is installed on the outer fixing sleeve 6. The end of the external clamping column 13 is provided with an external clamping groove 24 that is adapted to the side of the pin bolt 10. An external reset device is installed between the external clamping column 13 and the outer fixing sleeve 6.

[0042] An inner clamping post 17 is installed on the inner fixing sleeve 15. The end of the inner clamping post 17 has an inner clamping groove 30 that corresponds to the side of the pin bolt 10. An inner reset device is installed between the inner clamping post 17 and the inner fixing sleeve 15. Specifically, the cross-sectional shape of the outer clamping groove 24 and the inner clamping groove 30 is arc-shaped.

[0043] During normal operation, the outer clamping column 13 and the inner clamping column 17 restrict the rotation of the pin bolt 10.

[0044] When the thrust of the bucket cylinder 3 is too high, the pin 12 and the pin bolt 10 tend to rotate. The outer reset device and the inner reset device are compressed, the outer clamping column 13 and the inner clamping column 17 slide, and the pin bolt 10 rotates out from the outer clamping column 13 and the inner clamping column 17. This provides overload protection for the pin bolt 10 and can effectively identify overload operation. It also protects the structural components of the boom 1 and can effectively avoid cracking caused by long-term overload operation, thus avoiding serious economic losses.

[0045] The outer fixed sleeve 6 has an outer stepped hole 31. An outer connecting plate 8 is installed in the large hole of the outer stepped hole 31. The outer clamping column 13 is located in the small hole of the outer stepped hole 31. The outer reset device includes an outer clamping spring 14 located between the outer clamping column 13 and the outer connecting plate 8.

[0046] An inner connecting plate 16 is installed in the large hole of the inner step hole 32 on the inner fixed sleeve 15. The inner clamping column 17 is located in the small hole of the inner step hole 32. The reset device includes an inner clamping spring 18 located between the inner clamping column 17 and the inner connecting plate 16.

[0047] When the thrust of the bucket cylinder 3 is too large, the pin 12 and the pin bolt 10 tend to rotate, the outer clamping spring 14 and the inner clamping spring 18 are compressed, the outer clamping column 13 and the inner clamping column 17 slide, and the pin bolt 10 rotates out from the outer clamping column 13 and the inner clamping column 17, which plays an overload protection role for the pin bolt 10.

[0048] An external connecting rod 19 is connected to the external clamping column 13. An external connecting rod protrusion 20 is connected to the side of the external connecting rod 19. An external connecting pipe 21 is connected to the external connecting plate 8. The end of the external connecting pipe 21 has an external connecting rod hole 22 and an external connecting rod protrusion through hole 23. The inner diameter of the external connecting pipe 21 is larger than the diameter of the external connecting rod hole 22.

[0049] An inner connecting rod 25 is connected to the inner clamping column 17. An inner connecting rod protrusion 26 is connected to the side of the inner connecting rod 25. An inner connecting tube 27 is connected to the inner connecting plate 16. The inner connecting tube 27 has an inner connecting rod hole 28 and an inner connecting rod protrusion through hole 29. The inner diameter of the inner connecting tube 27 is larger than the diameter of the inner connecting rod hole 28.

[0050] In use, the outer connecting rod 19 is inserted into the outer connecting tube 21 through the outer connecting rod hole 22, and then the outer connecting rod 19 is rotated to make the outer connecting rod protrusion 20 misalign with the outer connecting rod protrusion through hole 23, thereby connecting the outer connecting rod 19 to the outer connecting tube 21; the inner connecting rod 25 is inserted into the inner connecting tube 27 through the inner connecting rod hole 28, and then the inner connecting rod 25 is rotated to make the inner connecting rod protrusion 26 misalign with the inner connecting rod protrusion through hole 29, thereby connecting the inner connecting rod 25 to the inner connecting tube 27.

[0051] The outer compression spring 14 is sleeved on the outer connecting pipe 21, and the inner compression spring 18 is sleeved on the inner connecting pipe 27.

[0052] During use, the outer compression spring 14 and the inner compression spring 18 extend and retract stably.

[0053] The external connecting bolt 9 passes through the external connecting plate 8 and is threadedly connected to the external fixing sleeve 6.

[0054] This structure uses external connecting bolts 9 to install the external connecting plate 8, which facilitates the disassembly of the external connecting plate 8.

[0055] The outer end of the outer fixing sleeve 6 is closed, and the outer fixing bolt 7 passes through the outer end of the outer fixing sleeve 6 and is threaded to the pin 12.

[0056] This structure uses external fixing bolts 7 to install the external fixing sleeve 6, which facilitates the disassembly of the external fixing sleeve 6.

[0057] The pin bolt 10 passes through the pin 12 and is threadedly connected to the nut 11.

[0058] This structure facilitates the removal of the pin bolt 10.

[0059] There are two outer clamping pins 13, which are located on both sides of the pin 12. There are also two inner clamping pins 17, which are located on both sides of the pin 12.

[0060] In this structure, the pin and bolt 10 are in a state of force balance.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A bolt clamping structure with boom overload protection function, comprising a bucket cylinder (3), wherein the output end of the bucket cylinder (3) is connected to a connecting rod (4) and a rocker arm (5) via a pin (12), characterized in that, An inner fixing sleeve (15) is sleeved on the pin (12), an outer fixing sleeve (6) is installed at the end of the pin (12), and the pin (12) is also connected to a pin bolt (10) located between the inner fixing sleeve (15) and the outer fixing sleeve (6). An external clamping column (13) is installed on the outer fixing sleeve (6). The end of the external clamping column (13) is provided with an external clamping groove (24) that is compatible with the side of the pin bolt (10). An external reset device is installed between the external clamping column (13) and the outer fixing sleeve (6). An inner clamping column (17) is installed on the inner fixing sleeve (15). The end of the inner clamping column (17) is provided with an inner clamping groove (30) that is adapted to the side of the pin bolt (10). An inner reset device is installed between the inner clamping column (17) and the inner fixing sleeve (15). An outer stepped hole (31) is provided on the outer fixed sleeve (6). An outer connecting plate (8) is installed in the large hole of the outer stepped hole (31). An outer clamping column (13) is located in the small hole of the outer stepped hole (31). The outer reset device includes an outer clamping spring (14) located between the outer clamping column (13) and the outer connecting plate (8). An inner connecting plate (16) is installed in the large hole of the inner step hole (32) on the inner fixed sleeve (15). The inner clamping column (17) is located in the small hole of the inner step hole (32). The reset device includes an inner clamping spring (18) located between the inner clamping column (17) and the inner connecting plate (16).

2. The bolt clamping structure with boom overload protection function as described in claim 1, characterized in that, An outer connecting rod (19) is connected to the outer clamping column (13), and an outer connecting rod protrusion (20) is connected to the side of the outer connecting rod (19). An outer connecting pipe (21) is connected to the outer connecting plate (8). The end of the outer connecting pipe (21) has an outer connecting rod hole (22) and an outer connecting rod protrusion through hole (23). The inner diameter of the outer connecting pipe (21) is larger than the diameter of the outer connecting rod hole (22). An inner connecting rod (25) is connected to the inner clamping column (17). An inner connecting rod protrusion (26) is connected to the side of the inner connecting rod (25). An inner connecting tube (27) is connected to the inner connecting plate (16). The inner connecting tube (27) has an inner connecting rod hole (28) and an inner connecting rod protrusion through hole (29). The inner diameter of the inner connecting tube (27) is larger than the diameter of the inner connecting rod hole (28).

3. The bolt clamping structure with boom overload protection function as described in claim 2, characterized in that, The outer compression spring (14) is sleeved on the outer connecting pipe (21), and the inner compression spring (18) is sleeved on the inner connecting pipe (27).

4. The bolt clamping structure with boom overload protection function as described in claim 1, characterized in that, The external connecting bolt (9) passes through the external connecting plate (8) and is threadedly connected to the external fixing sleeve (6).

5. The bolt clamping structure with boom overload protection function as described in any one of claims 1 to 4, characterized in that, The outer end of the outer fixing sleeve (6) is closed, and the outer fixing bolt (7) passes through the outer end of the outer fixing sleeve (6) and is threaded to the pin (12).

6. The bolt clamping structure with boom overload protection function as described in any one of claims 1 to 4, characterized in that, The pin bolt (10) passes through the pin (12) and is threaded into the nut (11).

7. The bolt clamping structure with boom overload protection function as described in any one of claims 1 to 4, characterized in that, There are two external clamping columns (13), which are located on both sides of the pin (12). There are two internal clamping columns (17), which are located on both sides of the pin (12).

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