Shackle with pin shaft anti-withdrawing structure

Abstract

The shackle comprises a shackle body, a pin shaft and a locking nut, a first pin hole and a second pin hole which are opposite to each other are formed in the two ends of an opening of the shackle body, the pin shaft is connected with the locking nut after sequentially penetrating through the first pin hole and the second pin hole, the second pin hole is divided into a threaded section and a smooth section, and the threaded section is connected with the threaded section. The pin shaft is provided with a main body part, a necking part and a matching part, the rear end face of the main body part is connected with a pin shaft head, the diameter of the pin shaft head is larger than that of the main body part, and the diameter of the necking part is smaller than that of the main body part and the matching part. The internal thread is arranged on the inner wall of the second pin hole, and the necking part capable of enabling the matching part to be disengaged from the internal thread is arranged between the main body part and the matching part, so that the situation that the locking nut is disengaged from the pin shaft after being damaged and the pin shaft slides out of the shackle body is prevented by utilizing a thread disengagement mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hoisting tool field, concretely relates to a shackle with pin shaft anti-exit structure. BACKGROUND

[0002] In the lifting operation, U-shaped shackles are frequently used as auxiliary tools for lifting. The upper end of the U-shaped shackle is connected with a hoisting device through a wire rope, and the lower end of the U-shaped shackle is connected with an object to be lifted, i.e. a lifting piece, through a wire rope. The existing shackle includes a U-shaped shackle body, a pin shaft, and a locking nut. Two end heads on both sides of the opening of the shackle body are each provided with a pin hole, and the front end of the pin shaft has external threads. In use, the front end of the pin shaft is sequentially inserted through the two pin holes and connected with the locking nut. However, in a complex and changeable lifting environment, the locking nut is easily hit by various external forces, thereby causing damage. Once the locking nut is damaged and falls off the pin shaft, the pin shaft will retract, causing the pin shaft to slide out of the shackle body, which not only seriously affects the normal progress of the lifting operation, but also greatly increases the lifting risk, and may even cause serious safety accidents. SUMMARY

[0003] The utility model aims to provide a shackle with pin shaft anti-exit structure, which can prevent the pin shaft from retracting after the locking nut is damaged and falls off the pin shaft.

[0004] The purpose of the utility model can be achieved by the following technical solutions:

[0005] A shackle with pin shaft anti-exit structure, comprising a U-shaped shackle body, a pin shaft, and a locking nut, the opening of the shackle body has opposite first and second pin holes, the pin shaft sequentially passes through the first and second pin holes and is connected with the locking nut, the second pin hole is divided into a threaded section on the outer side and a smooth section on the inner side, the pin shaft comprises a main body portion inserted from the outer side of the first pin hole and extending to the smooth section of the second pin hole, a neck portion extending forward from the front end of the main body portion to the threaded section, and a matching portion connected to the front end of the neck portion and connected with the locking nut, the tail end of the main body portion is connected with a pin shaft head abutting against the shackle body, the diameter of the pin shaft head is greater than the diameter of the main body portion, and the diameter of the neck portion is smaller than the diameters of the main body portion and the matching portion.

[0006] By adopting the above technical solutions, the second pin hole is divided into a smooth section and a threaded section, a neck portion capable of causing the matching portion to be detached from the threaded section is arranged between the main body portion and the matching portion, so that in the case where the locking nut is damaged and falls off the pin shaft, the pin shaft can be prevented from retracting due to the stop of the threaded section. The arrangement of the neck portion further increases the difficulty of retraction.

[0007] In the specific embodiment of the utility model, the main body part of the pin shaft is provided with an annular groove corresponding to the position of the first pin hole, the first pin hole side is provided with a positioning hole extending along the longitudinal direction corresponding to the position of the annular groove, a cylindrical pin is installed in the positioning hole, and the end of the cylindrical pin extends into the annular groove. By adopting the structure, the cylindrical pin can prevent the pin shaft from moving back and forth in the axial direction, and the design of the annular groove allows the pin shaft to rotate in the two pin holes without being interfered by the cylindrical pin. Meanwhile, the cylindrical pin can further prevent the pin shaft from retreating after the damage of the locking nut.

[0008] In the specific embodiment of the utility model, the cylindrical pin is an elastic cylindrical pin.

[0009] In the specific embodiment of the utility model, the cooperating part of the pin shaft is provided with a bolt hole outside the locking nut, a bolt is installed in the bolt hole, and the bolt head of the bolt is outside the bolt hole. By adopting the structure, when the locking nut is damaged and fails, the bolt can further prevent the pin shaft from retreating.

[0010] In the specific embodiment of the utility model, the number of bolt holes is two, the two bolt holes are symmetrically arranged, and a bolt is installed in each of the two bolt holes.

[0011] In the specific embodiment of the utility model, a tool groove is arranged on the rear end face of the pin shaft head. The tool groove is used for cooperating with a tool to fasten or disassemble the pin shaft.

[0012] In summary, in the utility model, the necking part can make the external thread of the cooperating part and the internal thread segment of the second pin hole realize tooth disengagement. In this way, when the locking nut is damaged and falls off from the pin shaft, the pin shaft can be prevented from retreating due to the stop of the thread segment. The setting of the necking part further increases the difficulty of retreating. Secondly, through the cooperation of the cylindrical pin and the annular groove, the pin shaft can be effectively prevented from moving in the axial direction, the pin shaft can be freely rotated in the two pin holes, and the pin shaft can be further prevented from retreating after the damage of the locking nut. Furthermore, by arranging the bolt hole on the cooperating part outside the locking nut, installing the bolt in the bolt hole, and arranging the bolt head outside the bolt hole, the pin shaft can be further prevented from retreating when the locking nut is damaged and falls off. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further described below in combination with the drawings.

[0014] Figure 1 is a structure schematic view of the shackle with the pin shaft anti-exit structure of the utility model;

[0015] Figure 2 is Figure 1 the sectional view of A-A in the utility model. DETAILED DESCRIPTION

[0016] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0017] Please refer to Figure 1 The utility model discloses a kind of pin shaft anti-exit structures's undogging, including U-shaped undogging body 10, pin shaft 20 and locking nut 30.Undogging body's opening both ends are oppositely provided with first pin hole 11 and second pin hole 12.When assembling, the front end of pin shaft 20 is sequentially inserted through first pin hole 11 and second pin hole 12 and is threadedly connected with locking nut 30.

[0018] Among them, second pin hole 12 is divided into threaded section 121 located at outer side and smooth section 122 located at inner side.

[0019] Pin shaft 20 includes main body part 21 inserted from the outer side of first pin hole 11 and extended to the smooth section 122 of second pin hole 12, necked part 22 extended from the front end of main body part 21 to threaded section 121 in front direction, and matching part 23 connected to the front end of necked part 22.Cooperating part 23 is provided with external thread matched with internal thread of locking screw thread.On the tail end of main body part 21, pin shaft head 24 is connected to abut against undogging body 10.The diameter of pin shaft head 24 is greater than the diameter of main body part 21.The diameter of necked part 22 is less than the diameter of main body part 21 and matching part 23.Tool groove 241 is provided on the rear end face of pin shaft head 24.Tool groove is used for cooperating with tool to fasten or disassemble pin shaft.When assembling, the matching part 23 of pin shaft 20 is sequentially inserted through first pin hole 11 and extends into the smooth section 122 of second pin hole 12.Subsequently, tool is inserted into tool groove, and pin shaft is rotated by rotating the tool, so that matching part 23 is rotated through threaded section 121 of second pin hole 12.When matching part 23 completely passes through threaded section 121 and is disengaged, locking nut 30 is threadedly connected with matching part 23.By adopting such structure, in the case that locking nut is damaged and falls off from pin shaft, pin shaft can be prevented from back-off due to the stop of threaded section 121.The setting of necked part further increases back-off difficulty.

[0020] In the embodiment, the main body part of the pin shaft 20 is provided with an annular groove 25 at a position corresponding to the first pin hole 11. A positioning hole 13 extending in the longitudinal direction is formed at a position on the side of the first pin hole 11 corresponding to the annular groove 25. A cylindrical pin 14 is installed in the positioning hole 13. The end of the cylindrical pin 14 extends into the annular groove. With this structure, the cylindrical pin can prevent the pin shaft from moving back and forth in the axial direction, and the design of the annular groove allows the pin shaft to rotate in the two pin holes without interference from the cylindrical pin. At the same time, the cylindrical pin can further prevent the pin shaft from retracting after the locking nut is damaged.

[0021] In the embodiment, the cylindrical pin 14 is a resilient cylindrical pin. The resilient cylindrical pin has elasticity, which can be deformed to a certain extent during connection, thereby achieving a tight connection.

[0022] In combination Figure 2 As shown in the drawings, in the embodiment, the fitting part 23 of the pin shaft 20 is provided with a bolt hole 231 on the outside of the locking nut 30. A bolt 232 is installed in the bolt hole 231. The bolt head 233 of the bolt 232 is located on the outside of the bolt hole 231. With this structure, when the locking nut is damaged and fails, the bolt head is stopped on the outside of the second pin hole, thereby preventing the pin shaft from sliding out of the shackle body.

[0023] In the embodiment, the number of bolt holes 231 is two, and the two bolt holes 231 are symmetrically arranged, with a bolt installed in each of the two bolt holes.

[0024] During assembly, the fitting part 23 of the pin shaft 20 is sequentially inserted through the first pin hole 11 and extends into the smooth section 122 of the second pin hole 12. Then, a tool is inserted into the tool groove, and the pin shaft is rotated by rotating the tool, thereby causing the fitting part 23 to rotate through the threaded section 121 of the second pin hole 12. When the fitting part 23 completely passes through the threaded section 121, it is disengaged. After the pin shaft is rotated into position, the cylindrical pin is inserted into the positioning hole with the end extending into the annular groove 25. Then, after the locking nut 30 is threadedly connected with the fitting part 23, the two bolts 232 are respectively installed in the corresponding threaded holes 231, and the assembly is completed.

[0025] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still be included in the patent coverage of the present application.

Claims

1. A pin shaft anti-exit structure of a shackle, comprising a U-shaped shackle body, a pin shaft and a locking nut, opposite first and second pin holes are formed at both ends of the opening of the shackle body, the pin shaft passes through the first and second pin holes in sequence and is connected with the locking nut, characterized in that, The second pin hole is divided into a threaded section on the outer side and a smooth section on the inner side, the pin shaft includes a main body part inserted from the outer side of the first pin hole and extending to the smooth section of the second pin hole, a neck part extending forward from the front end of the main body part to the threaded section, and a matching part connected to the front end of the neck part and connected with the locking nut, the tail end of the main body part is connected with a pin shaft head abutting against the body of the shackle, the diameter of the pin shaft head is larger than the diameter of the main body part, and the diameter of the neck part is smaller than the diameters of the main body part and the matching part.

2. The shackle with pin shaft anti-exit structure according to claim 1, characterized in that, The main body part of the pin shaft is provided with an annular groove corresponding to the position of the first pin hole, the side part of the first pin hole is provided with a positioning hole extending in the longitudinal direction corresponding to the position of the annular groove, and a cylindrical pin is installed in the positioning hole, and the end of the cylindrical pin extends into the annular groove.

3. The shackle with pin shaft anti-exit structure according to claim 2, characterized in that, The cylindrical pin is an elastic cylindrical pin.

4. The shackle with pin shaft anti-exit structure according to claim 1, characterized in that, The matching part of the pin shaft is provided with a bolt hole on the outer side of the locking nut, a bolt is installed in the bolt hole, and the bolt head of the bolt is located on the outer side of the bolt hole.

5. The shackle with pin shaft anti-exit structure according to claim 4, characterized in that, The number of the bolt holes is two, the two bolt holes are symmetrically arranged, and a bolt is installed in each of the two bolt holes.

6. The shackle with pin shaft anti-exit structure according to claim 1, characterized in that, A tool groove is arranged on the rear end face of the pin shaft head.

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