CN219388367U - Quincuncial expansion pin shaft - Google Patents

Abstract

The utility model provides a quincuncial expansion pin shaft, which comprises the following components: the device comprises a main shaft, an end cover, a long bolt and a nut, wherein the main shaft is axially arranged along the center, and two ends of the main shaft are conical; the end cover comprises a cover surface and a cover skirt, wherein the cover skirt is provided with conical holes along the central axial direction and a plurality of expansion holes along the circumference; two ends of the main shaft are respectively embedded into conical holes of the end covers which are respectively arranged at two sides; the long bolt sequentially penetrates through the end cover and the main shaft and is fastened through the nut. The utility model has low requirement on the concentricity of the central line of the hole positions between the connecting piece seat holes, does not need to change the original machine parts, is convenient to replace, can effectively eliminate the influence of the pin shaft on the connecting piece seat holes, and prolongs the service life of the connecting piece seat holes.

Description

Quincuncial expansion pin shaft

Technical Field

The utility model relates to a precise connecting piece for connecting mechanical equipment, in particular to a quincuncial expansion pin shaft.

Background

The pin shaft is a standardized fastener and is mainly used for the hinge joint of two parts to form hinge connection. As a historical existence, the traditional pin shaft is basically a through shaft, namely a bare shaft type pin shaft, and the structure is simple in design, flexible in adaptation and various in installation form, so that the manufacturing field and the application range of the equipment are greatly improved.

The traditional bare shaft type pin shafts have a commonality, the pin shafts are a through shaft (bare shaft) which is required to be fixed through seat holes of two connecting pieces, two ends of the shaft are only chamfered, concentricity of the seat holes is required to be consistent when the shaft passes through the seat holes, deviation and displacement cannot occur, otherwise, the through shaft is difficult to penetrate through the two seat holes, and a certain installation difficulty exists.

In addition, the traditional bare shaft type pin shaft can ensure that the connecting piece rotates around the pin shaft in a certain radial direction, and meanwhile, the relative displacement or relative displacement trend generated by the action of radial shearing force inevitably exists, so that the abrasion between a seat hole of the connecting piece and the bare shaft can be caused under the action of the shearing force, the abrasion of the seat hole accelerates the abrasion of the pin shaft, a vicious circle is formed, and if the replacement is not timely, the damage of a seat hole machine part and even the matrix scrapping can be caused. Although some pin shafts or seat holes are lubricated by filling lubricating oil or are provided with abrasion-proof measures such as bushings, the abrasion degree is only slowed down, and damage caused by shearing force cannot be completely solved by technical means. And the seat holes are mostly cast and cannot be repaired, so that the whole machine part is scrapped, and the pin shaft technology is required to be further improved and replaced.

Disclosure of Invention

The utility model aims to provide a quincuncial expansion pin shaft so as to solve the technical problems in the prior art.

In order to achieve the above purpose, the plum blossom type expansion pin roll disclosed by the utility model adopts the following technical scheme: a quincuncial expansion pin, comprising: the device comprises a main shaft, an end cover, a long bolt and a nut, wherein the main shaft is axially arranged along the center, and two ends of the main shaft are conical; the end cover comprises a cover surface and a cover skirt, wherein the cover skirt is provided with conical holes along the central axial direction and a plurality of expansion holes along the circumference; two ends of the main shaft are respectively embedded into conical holes of the end covers which are respectively arranged at two sides; the long bolt sequentially penetrates through the end cover and the main shaft and is fastened through the nut.

Further, the gradient of the conical hole is matched with the taper of the main shaft.

Further, the number of the expansion holes is five and the expansion holes are uniformly distributed.

Further, the length of the expansion hole is 3/5-4/5 of the height of the end cover.

Further, the thickness of the cover surface is 1/5 of the height of the end cover, and an end shoulder is arranged at the joint of the cover surface and the cover skirt.

The utility model has the beneficial effects that:

(1) The two ends of the main shaft are conical, and the conical degree can play a certain role in adjusting in the process of penetrating into the base holes of the connecting pieces at the two ends, so that the two connecting pieces automatically align to the hole sites along with the gradual entering of the main shaft.

(2) Because the end cover and the seat hole of the connecting piece are in interference fit, under the condition that the whole pin shaft is subjected to shearing force, stress can be concentrated between the main shaft and the end cover, so that the relative movement between the end cover and the seat hole is reduced, the influence on the seat hole originally is eliminated, the seat hole is protected from being stressed or is subjected to very small force, and the service life of the seat hole is prolonged.

(3) The gradient of the end skirt taper hole is more tightly matched with the main shaft along with the action of the tightening force of the nut, and after the end cover and the main shaft are worn, the wear can be eliminated by fastening the nut to increase the tightening force or directly replacing the end cover, so that the operation is convenient, and the end shoulder is utilized to play a role in preventing looseness.

Drawings

Fig. 1: is a schematic diagram of the whole structure of the utility model;

fig. 2: is a front view of the spindle of the present utility model;

fig. 3: is a right side view of the spindle of the present utility model;

fig. 4: is a front view of the end cap of the present utility model;

fig. 5: is a right side view of the end cap of the present utility model;

fig. 6: a cross-sectional view of the spindle and end cap of the present utility model when installed;

in the figure: 1-a main shaft; 2-long bolts; 3-end caps; 31-capping; 32-cover skirt; 4-nuts; 5-a central hole; 6-expansion holes; 7-a conical hole; 8-end shoulder; 9-through holes.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model.

As shown in fig. 1, a quincuncial expansion pin includes: the main shaft 1, the long bolt 2, the end cover 3 and the nut 4 are arranged along the central axial direction, and the two ends of the main shaft 1 are conical as shown in fig. 2; the main shaft 1 is provided with a central hole 5 along a central axis for accommodating the long bolt 2.

One end of the long bolt 2 is provided with threads, and the long bolt 2 sequentially penetrates through the main shaft 1 and end covers 3 respectively arranged on two sides of the main shaft 1 and is screwed tightly through nuts 4 to keep a relatively static state.

As shown in fig. 4, the end cover 3 includes a cover surface 31 and a cover skirt 32, the thickness of the cover surface is preferably 1/5 of the height of the end cover, and an end shoulder 8 is disposed at the joint of the cover surface 31 and the cover skirt 32, so as to play an axial limiting role. The cover skirt 32 is provided with a tapered hole 7 along the central axis.

Two ends of the main shaft 1 are respectively embedded into conical holes 7 respectively arranged on the two sides of the end cover 3; the gradient of the conical hole 7 is matched with the taper of the two ends of the main shaft 1, so that the cover skirt 32 is attached to the outer circumference of the end part of the main shaft 1 while the two ends of the main shaft 1 can be embedded into the conical hole 7. The end cover 3 is also provided with a through hole 9 along the central axis, the setting diameter of the through hole 9 is the same as that of the central hole 5, and the through hole 9 is on the same central line when in actual installation and use.

The cover skirt 32 is circumferentially provided with a plurality of expansion holes 6, the number of the expansion holes 6 can be designed according to practical use requirements, preferably five expansion holes are uniformly distributed, and the length of the expansion holes 6 is preferably 3/5-4/5 of the height of the end cover 3 so as to adjust the fit clearance between the end cover 3 and the connecting piece seat hole and the main shaft 1. When the two ends of the main shaft 1 are embedded into the end covers 3, the end covers 3 are in interference fit with the base holes of the connecting piece.

The main function of the expansion holes 6 is as follows: firstly, ensuring that the end cover 3 can smoothly enter the connecting piece seat hole; secondly, the two conical surfaces at the two ends of the main shaft 1 are reliably contacted; and thirdly, when the two connecting pieces are acted by shearing force, the stress surface can be ensured to act between the main shaft 1 and the end cover 3, so that the influence on the stress of the seat holes of the connecting pieces is reduced.

Specifically, during installation, the main shaft 1 is firstly installed in a seat hole of a connecting piece, the end cover 3 is installed, the end cover 3 is knocked to enable the two ends of the main shaft 1 to be embedded into the end cover 3, the cover skirt 32 is expanded to form a quincuncial end cover, then the long bolt 2 penetrates through the through hole 9 and the central hole 5, and then the nut 4 is used for tightening and fixing, so that the installation and the use are completed.

According to the utility model, through the formed quincuncial end cover and the adjustment of the bolt tensioning force of the end cover 3, the gap between the end cover 3 and the seat hole is eliminated, so that the end cover is firmly connected with the connecting piece base body, the problems of the traditional bare shaft type pin shaft that the installation difficulty is high, the seat hole is worn due to relative displacement between the pin shaft and the connecting piece seat hole, and the like are solved, the service lives of the main shaft 1 and the end cover 3 are prolonged, and the pin shaft and the connecting piece seat hole are prevented from being damaged. And the installation is convenient, easy to operate, the requirement on the concentricity of the central line of the hole site between two connecting pieces is not high during the installation, the hole site is automatically adjusted in the penetrating process of the main shaft 1, and the main pin 1 or the end cover 3 can be replaced by a single body after being worn.

The quincuncial expansion pin shaft provided by the utility model has the advantages that the original machine part is not required to be changed, the service life is long, the service life of the original traditional bare shaft type pin shaft used for 6 months can be prolonged to 2 years even if the quincuncial expansion pin shaft is used in the worst environment, and the seat hole of a connecting piece is not damaged.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (5)

1. The utility model provides a quincuncial expansion pin axle which characterized in that includes: the device comprises a main shaft, an end cover, a long bolt and a nut, wherein the main shaft is axially arranged along the center, and two ends of the main shaft are conical; the end cover comprises a cover surface and a cover skirt, wherein the cover skirt is provided with conical holes along the central axial direction and a plurality of expansion holes along the circumference; two ends of the main shaft are respectively embedded into conical holes of the end covers which are respectively arranged at two sides; the long bolt sequentially penetrates through the end cover and the main shaft and is fastened through the nut.

2. The quincuncial expansion pin of claim 1, wherein the slope of the tapered bore is adapted to the taper of the main shaft.

3. The quincuncial expansion pin of claim 1, wherein the number of expansion holes is five and evenly distributed.

4. A quincuncial expansion pin according to claim 3, wherein the expansion hole has a length of 3/5-4/5 of the height of the end cap.

5. The quincuncial expansion pin of claim 1, wherein the cover surface has a thickness of 1/5 of the cover surface height, and wherein the cover surface and the cover skirt are provided with end shoulders at their connection.