Anti-rotation self-locking safety device for pin shaft

Abstract

The invention provides a pin shaft anti-rotation self-locking safety device, and relates to the technical field of pin shaft connecting devices, the pin shaft anti-rotation self-locking safety device comprises a first connecting lug plate and a second connecting lug plate which are arranged at an interval and fixed on a lug plate base; the first connecting lug plate and the second connecting lug plate penetrate through the inner surface and the outer surface and are provided with a first mounting hole and a second mounting hole respectively, and the limiting boss is arranged on the outer side face of the first connecting lug plate and is close to the first mounting hole. The pin shaft is provided with a first end and a second end, the first end is provided with a milling surface, and the milling surface of the first end is connected with the upper surface of the limiting boss; and the second end head penetrates through the first mounting hole and the second mounting hole and is in threaded connection with the position adjusting nut. One end of the pin shaft is in contact with the surface of the limiting boss for limiting, the other end of the pin shaft is limited through the positioning nut and the locking screw, the rotating torque of the pin shaft is uniformly transmitted to the limiting boss and the locking screw, the locking screw can be prevented from being broken, and the safety and stability of the rotating limiting structure are improved.

Description

Technical Field

[0001] The invention relates to the technical field of pin connection devices, and in particular to a pin anti-rotation self-locking safety device. Background Art

[0002] Pin articulation is a common mechanical connection method, including end cover type, nut type and pallet type. Among them, the end cover type and nut type can only limit the axial movement of the pin, but cannot limit the axial rotation. For pin connections with axial rotation limit requirements, the pallet type is used. However, the pallet type requires two bolt holes to be set on the ear plate, and the pallet is fixed by bolts. The pallet and the pin are positioned through line-surface contact to achieve the limiting effect. During the pallet manufacturing process, the two bolt holes need to be drilled with the pallet, and the manufacturing accuracy requirements are high. In addition, the pallet type pin structure also has the problem that the axial rotation force of the pin is fully transmitted to the bolt, and the excessive torque causes the bolt body to break.

[0003] In view of this, how to provide a simple, safe and stable anti-axial rotation pin structure is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a pin anti-rotation self-locking safety device to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides a pin anti-rotation self-locking safety device, comprising:

[0006] A first connecting ear plate and a second connecting ear plate are arranged at intervals and fixed on the ear plate base;

[0007] A limiting boss, wherein the first connecting ear plate and the second connecting ear plate are respectively provided with a first mounting hole and a second mounting hole through the inner and outer surfaces thereof, and the limiting boss is arranged on the outer side surface of the first connecting ear plate and close to the first mounting hole;

[0008] The pin shaft has a first end and a second end, the first end has a milling surface, and the milling surface of the first end is connected to the upper surface of the limiting boss; the second end passes through the first mounting hole and the second mounting hole and is threadedly connected to the adjusting nut.

[0009] Furthermore, the milling surface is arranged on the upper and lower sides of the first end head.

[0010] Furthermore, it also includes:

[0011] The locking screw is provided with a plurality of limiting holes along the circumferential direction of the adjusting nut, and the locking screw is connected to the outer side surface of the second connecting ear plate and is inserted into the limiting holes.

[0012] Furthermore, the locking screw comprises:

[0013] A threaded connection portion, wherein a screw hole is provided on the outer side surface of the second connection ear plate, and the threaded connection portion is threadedly connected to the screw hole;

[0014] A limiting rod, wherein the limiting rod is coaxially connected to the threaded connection part and the limiting rod is located at one end of the threaded connection part away from the second connecting ear plate, the outer diameter of the limiting rod is smaller than the outer diameter of the threaded connection part, the threaded connection part and the limiting rod can be screwed into the screw hole together, the limiting hole is adapted to the shape of the limiting rod, when the limiting rod is screwed outward from the screw hole, the limiting rod can be stuck in the limiting hole, and the adjusting nut can limit the threaded connection part.

[0015] Furthermore, the plurality of limiting holes are evenly spaced along the circumference of the adjusting nut, and the spacing angle between adjacent limiting holes is 30-60°.

[0016] The present invention discloses the following technical effects:

[0017] 1. A limiting boss is set on one side of the ear plate, and the axial rotation limit of the pin shaft is realized by the contact between the milling surface on the limiting boss and the pin shaft surface. Compared with the prior art, the limiting contact area is larger and the safety is stronger.

[0018] 2. One end of the pin is limited by contact with the limiting boss surface, and the other end is limited by the adjusting nut and the locking screw. The rotation torque of the pin is evenly transmitted to the limiting boss and the locking screw, reducing the unilateral rotation torque of the pin, which can avoid the locking screw from breaking, and further improve the safety and stability of the rotation limiting structure. In addition, the locking screw adopts a large-size threaded connection and can be screwed into the screw hole as a whole. When the locking screw rotates in the opposite direction, the limiting rod is stuck in the limiting hole, and the adjusting nut can form a self-locking effect on the threaded connection, that is, it prevents the threaded connection from falling off from the screw hole, and realizes the effect of mutual limiting of each part, making the overall pin structure safe and reliable, suitable for various working conditions such as frequent disassembly and bearing alternating loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0022] Figure 3 This is a schematic diagram of the installation of locking screws and pins;

[0023] Figure 4 This is a schematic diagram of the installation of the adjustment nut;

[0024] Figure 5 This is a schematic diagram of the coordination between the adjusting nut and the locking screw;

[0025] Among them, 1. first connecting ear plate; 2. second connecting ear plate; 3. ear plate base; 4. limiting boss; 5. pin shaft; 501. first end; 5011. milling surface; 502. second end; 6. adjusting nut; 601. limiting hole; 7. locking screw; 701. threaded connection part; 702. limiting rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The present embodiment provides a pin shaft anti-rotation self-locking safety device, comprising: a first connecting ear plate 1 and a second connecting ear plate 2, which are arranged at intervals and fixed on an ear plate base 3; the first connecting ear plate 1 and the second connecting ear plate 2 are respectively provided with a first mounting hole and a second mounting hole through the inner and outer surfaces, and a limiting boss 4 is arranged on the outer side surface of the first connecting ear plate 1 and close to the first mounting hole; the pin shaft 5 has a first end 501 and a second end 502, the first end 501 has a milling surface 5011, the milling surface 5011 is arranged on the upper and lower sides of the first end 501, and the milling surface 5011 of the first end 501 is connected to the upper surface of the limiting boss 4; the second end 502 passes through the first mounting hole and the second mounting hole and is threadedly connected to the adjusting nut 6.

[0029] In this embodiment, it also includes: a locking screw 7, a positioning nut 6 is provided with a plurality of limiting holes 601 along the circumference, the plurality of limiting holes 601 are evenly spaced along the circumference of the positioning nut 6, and the interval angle between adjacent limiting holes 601 is 60°, the locking screw 7 is connected to the outer side surface of the second connecting ear plate 2 and is inserted into the limiting hole 601.

[0030] In this embodiment, the locking screw 7 includes: a threaded connection part 701, a screw hole is provided on the outer side surface of the second connection ear plate 2, and the threaded connection part 701 is threadedly connected to the screw hole; a limiting rod 702 is coaxially connected to the threaded connection part 701 and the limiting rod 702 is located at one end of the threaded connection part 701 away from the second connection ear plate 2, the limiting rod 702 and the threaded connection part 701 are both cylindrical, the outer diameter of the limiting rod 702 is smaller than the outer diameter of the threaded connection part 701, and a straight rotation groove is provided at one end of the limiting rod 702 away from the second connection ear plate 2. The threaded connection part 701 and the limiting rod 702 can be screwed into the screw hole together, the limiting hole 601 and the limiting rod 702 are adapted in shape, and when the limiting rod 702 is screwed out from the screw hole, the limiting rod 702 can be stuck in the limiting hole 601, and the adjusting nut 6 can limit the threaded connection part 701.

[0031] The specific installation and use method of this embodiment is as follows:

[0032] S1: Install the locking screw 7 and the pin 5. There is no order requirement for the installation of the two. Taking the installation of the locking screw 7 as an example, place the threaded connection part 701 into the screw hole, rotate the limiting rod 702 from the outside, and screw the entire locking screw 7 into the screw hole. At this time, the outer side surface of the limiting rod 702 is flush with the outer side surface of the second connecting ear plate 2; pass the pin 5 through the first mounting hole and the second mounting hole on the first connecting ear plate 1 and the second connecting ear plate 2, so that the milling surface 5011 of the first end 501 of the pin 5 is connected to the upper surface of the limiting boss 4, and screw the adjusting nut 6 into the second end 502 of the pin 5 to fix the pin 5 on the first connecting ear plate 1 and the second connecting ear plate 2, and at the same time rotate the adjusting nut 6 to a position corresponding to a certain limiting hole 601 and the limiting rod 702.

[0033] S2: Rotate the limiting rod 702 in the opposite direction from the outside to move the locking screw 7 as a whole toward the outside of the second connecting ear plate 2 until the limiting rod 702 is inserted into the limiting hole 601. At this time, the threaded connection part 701 is still threadedly connected with the screw hole, and its outer surface is limited by the adjusting nut 6. After installation, the pin shaft 5 is limited by the limiting boss 4 and the locking screw 7 at the same time and cannot rotate axially.

[0034] S3: When disassembling, screw the entire locking screw 7 into the screw hole again to make the outer side of the limiting rod 702 flush with the second connecting ear plate 2. The locking screw 7 does not need to be disassembled and can be fixed in the screw hole and wait for the next use. Disassemble the adjustment nut 6 and the pin 5 in turn.

[0035] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A pin anti-rotation self-locking safety device, characterized in that: include: A first connecting ear plate (1) and a second connecting ear plate (2) are arranged at intervals and fixed on the ear plate base (3); A limiting boss (4), wherein the first connecting ear plate (1) and the second connecting ear plate (2) are respectively provided with a first mounting hole and a second mounting hole through the inner and outer surfaces thereof, and the limiting boss (4) is arranged on the outer side surface of the first connecting ear plate (1) and close to the first mounting hole; The pin shaft (5) comprises a first end head (501) and a second end head (502); the first end head (501) comprises a milling surface (5011); the milling surface (5011) of the first end head (501) is connected to the upper surface of the limiting boss (4); the second end head (502) passes through the first mounting hole and the second mounting hole and is threadedly connected to the adjusting nut (6).

2. A pin anti-rotation self-locking safety device according to claim 1, characterized in that: The milling surface (5011) is arranged on the upper and lower sides of the first end head (501).

3. A pin anti-rotation self-locking safety device according to claim 1, characterized in that: Also includes: The locking screw (7) is provided with a plurality of limiting holes (601) along the circumferential direction of the adjusting nut (6); the locking screw (7) is connected to the outer side surface of the second connecting ear plate (2) and is inserted into the limiting holes (601).

4. A pin anti-rotation self-locking safety device according to claim 3, characterized in that: The locking screw (7) comprises: A threaded connection portion (701), wherein a screw hole is provided on the outer side surface of the second connection ear plate (2), and the threaded connection portion (701) is threadedly connected to the screw hole; A limiting rod (702), wherein the limiting rod (702) is coaxially connected to the threaded connection part (701) and the limiting rod (702) is located at one end of the threaded connection part (701) away from the second connecting ear plate (2), the outer diameter of the limiting rod (702) is smaller than the outer diameter of the threaded connection part (701), the threaded connection part (701) and the limiting rod (702) can be screwed into the screw hole together, the limiting hole (601) and the limiting rod (702) are adapted in shape, and when the limiting rod (702) is screwed outward from the screw hole, the limiting rod (702) can be inserted into the limiting hole (601), and the adjusting nut (6) can limit the threaded connection part (701).

5. A pin anti-rotation self-locking safety device according to claim 3, characterized in that: The plurality of limiting holes (601) are evenly spaced along the circumference of the adjusting nut (6), and the spacing angle between adjacent limiting holes (601) is 30-60°.

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