CN110936293A

CN110936293A - Elastic bushing

Info

Publication number: CN110936293A
Application number: CN201911396132.XA
Authority: CN
Inventors: 任长春; 张颖利; 孙妍; 马云鹏
Original assignee: Nanjing College of Information Technology
Current assignee: Nanjing College of Information Technology
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-03-31

Abstract

The invention discloses an elastic bushing, which comprises a first arc-shaped bushing, a second arc-shaped bushing and a fan-shaped wedge block, wherein the sections of the first arc-shaped bushing and the second arc-shaped bushing are arc-shaped, and the first arc-shaped bushing, the second arc-shaped bushing and the fan-shaped wedge block are encircled to form a sleeve-shaped flexible bushing; the first arc-shaped bushing and the second arc-shaped bushing are formed by enclosing a plurality of fan-shaped pressing blocks and a plurality of flexible clapboards, the fan-shaped pressing blocks and the flexible clapboards are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks and the flexible clapboards are connected through an adhesive; a space is reserved between the outer surface of the flexible baffle plate and the outer surface of the lining, and a space is reserved between the inner surface of the flexible baffle plate and the inner surface of the lining. The elastic bushing has the advantages that the elastic of the flexible clapboard and the existence of the U-shaped corrugation enable the flexible bushing to contract or expand radially under the action of external force.

Description

Elastic bushing

Technical Field

The invention relates to an elastic bushing, and belongs to the technical field of process equipment for machining.

Background

In the prior art, the clamping of some irregular shaft parts is difficult, the clamping of common three-jaw tools is inconvenient, and the clamping precision of a two-jaw tool with a conventional design is not too high.

Disclosure of Invention

The invention aims to provide an elastic bushing which can radially contract or expand under the action of external force, so that irregular shaft parts are convenient to position and mount.

The specific technical scheme is as follows: an elastic bushing comprises a first arc-shaped bushing, a second arc-shaped bushing and a fan-shaped wedge block, wherein the sections of the first arc-shaped bushing and the second arc-shaped bushing are arc-shaped, and the first arc-shaped bushing, the second arc-shaped bushing and the fan-shaped wedge block are encircled to form a sleeve-shaped flexible bushing; the first arc-shaped bushing and the second arc-shaped bushing are formed by enclosing a plurality of fan-shaped pressing blocks and a plurality of flexible clapboards, the fan-shaped pressing blocks and the flexible clapboards are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks and the flexible clapboards are connected through an adhesive; a space is reserved between the outer surface of the flexible baffle plate and the outer surface of the lining, and a space is reserved between the inner surface of the flexible baffle plate and the inner surface of the lining.

The elastic bushing of the present invention can radially contract or expand under an external force due to the elasticity of the flexible diaphragm and the existence of the U-shaped corrugations.

Preferably, the flexible partition board is made of soft materials, and the soft materials are rubber.

Preferably, the first arc-shaped bushing and the second arc-shaped bushing are sleeved with the thin-wall sleeve along the axial direction, and the thin-wall sleeve is wrapped on the surfaces of the first arc-shaped bushing and the second arc-shaped bushing; the thin-wall sleeve forms U-shaped folds in the space between the outer surface of the flexible clapboard and the outer surface of the lining and in the space between the inner surface of the flexible clapboard and the inner surface of the lining, and the U-shaped folds can improve the flexibility of the thin-wall sleeve.

Preferably, the thin-wall sleeve is made of thin steel plates.

The invention has the beneficial effects that:

the inner hole of the elastic bush is filled with parts, and the parts can radially contract or expand under the action of external force, so that irregular shaft parts are convenient to position and mount.

Drawings

Fig. 1 is a detail view of an elastic bushing.

Fig. 2 is a component view of a first arcuate bushing.

FIG. 3 is a detail view of a sector wedge within a flexible bushing.

Fig. 4 is a general view of an elastic bush applied to embodiment 1.

Fig. 5 is a cutaway view of fig. 4.

FIG. 6 is an assembled cutaway view of the clamp body, nut, snap-gauge and elastic taper sleeve of the tooling of example 1.

Fig. 7 is a view of the parts of a prior art head to be machined in example 1.

Detailed Description

The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.

In order to make the disclosure of the present invention more comprehensible, the following description is further made in conjunction with fig. 1 to 7 and the detailed description.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 and 2, the elastic bushing 70 comprises a first arc bushing 71, a second arc bushing 72 and a fan-shaped wedge 73, the first arc bushing 71 and the second arc bushing 72 are arc-shaped in cross section, and the first arc bushing 71, the second arc bushing 72 and the fan-shaped wedge 73 enclose a sleeve-shaped flexible bushing; the first arc-shaped bushing 71 and the second arc-shaped bushing 72 are formed by enclosing a plurality of fan-shaped pressing blocks 74 and a plurality of flexible clapboards 75, the fan-shaped pressing blocks 74 and the flexible clapboards 75 are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks 74 and the flexible clapboards 75 are connected through an adhesive; a space is left between the outer surface of the flexible diaphragm 75 and the outer surface of the bushing, and a space is left between the inner surface of the flexible diaphragm 75 and the inner surface of the bushing.

As shown in fig. 1 and 2, the flexible partition 75 is made of a soft material, and the soft material is rubber. The first arc-shaped bushing 71 and the second arc-shaped bushing 72 are sleeved with a thin-wall sleeve 76 along the axial direction, and the thin-wall sleeve 76 is made of thin steel plates. The thin-wall sleeve 76 is wrapped on the surfaces of the first arc-shaped bushing 71 and the second arc-shaped bushing 72; the thin walled sleeve 76 forms U-shaped corrugations 77 in both the space between the outer surface of the flexible diaphragm 75 and the outer surface of the liner and the space between the inner surface of the flexible diaphragm 75 and the inner surface of the liner, which U-shaped corrugations enhance the flexibility of the thin walled sleeve.

The irregular shaft parts are installed in the inner hole of the elastic bushing 70, and the elastic diaphragm 75 and the U-shaped corrugation 77 make the elastic bushing 70 radially contract or expand under the action of external force.

Example 1

The yT23 rock drill is a high-efficiency air-leg rock drill, mainly used for rock drilling operation in mining roadway tunneling, is also an important tool in railway, water conservancy construction and national defense stone engineering, can perform wet rock drilling on medium-hard and hard rocks, and can drill horizontal and inclined blast holes.

As shown in fig. 5, the present design relates to a head 90 which is one of the main parts of the yT23 rock drill. The part is roughly cylindrical, and comprises a cylindrical surface 91, a drill clamp support frame 92, an ear plate 93 provided with a pull rod bolt hole, a cylindrical bulge 94 and an inner hole 95, wherein a blank is mostly a forged piece or a precision casting piece. In the grinding process of the inner hole 95 of the machine head, due to the irregular shape of parts, the fork-shaped drill clamp support frame 92 at the left end protrudes out of the cylindrical surface 91, and the two lug plate 93 bulges and the other cylindrical bulge 94 which are provided with pull rod bolt holes are arranged at the right end, so that the workpiece is difficult to clamp, common three-jaw tools are inconvenient to clamp, and the clamping precision of the two-jaw tool in the conventional design is not too high.

The machine head 90 of the yT23 rock drilling machine is taken as an example of an irregular part to be machined, and in order to meet machining requirements and guarantee machining precision, a special tool for grinding a hole in the machine head of the rock drilling machine is designed.

As shown in fig. 2 and 3, the rock drill head hole grinding tool provided by this embodiment includes a coupling disc 10, a fixture body 20, a nut 30, a clamping plate 40, an elastic taper sleeve 50, a positioning sleeve 60 and an elastic bushing 70, where one end of the fixture body 20 is fixed to the coupling disc 10, the positioning sleeve 60 is coaxially mounted on the coupling disc 10, the positioning sleeve 60 is located in the fixture body 20, the elastic taper sleeve 50 is inserted from the other end of the fixture body 20, the elastic bushing 70 is inserted into the elastic taper sleeve 50, the to-be-processed rock drill head 90 is installed in the elastic bushing 70, the nut 30 is connected with the clamping plate 40, the clamping plate 40 is clamped on the elastic taper sleeve 50, and the nut 30 is connected with a screw pair at a port at the other end of.

As shown in fig. 3, the coupling plate 10 is a disc-shaped flange with a central hole, a first spigot coaxial with the central hole is arranged on the right end face of the coupling plate 10, and the first spigot is matched with an inner hole at the left end of the clamp body 20 to ensure the coaxiality of the clamp body 20 and the coupling plate 10.

As shown in fig. 3, the positioning sleeve 60 is a revolving body component provided with an inner hole, the positioning sleeve 60 is matched and positioned with the central hole of the coupling disk 10 through an annular positioning cylinder convexly arranged on the end surface of the left end, and the positioning sleeve 60 is connected with the coupling disk 10 through an annular flange arranged on the outer surface of the left end; the right end port of the positioning sleeve 60 is provided with a second spigot which is matched with an inner hole at the left end port of the machine head 90, and the diameter of the inner hole of the positioning sleeve 60 is slightly larger than that of the inner hole at the left end of the machine head 90.

As shown in fig. 2 and 3, the fixture body 20 is a revolving body part provided with an inner hole, the inner hole at the left end of the fixture body 20 is a cylindrical inner hole, the inner hole at the right end of the fixture body 20 is a tapered hole, and the large opening of the tapered hole faces to the right; the right end taper hole of the fixture body 20 is matched with the outer taper surface of the elastic taper sleeve 50; an external thread is provided on the outer surface of the right end port of the clamp body 20. The orifice of the cylindrical inner hole at the left end of the clamp body 20 is matched with a spigot arranged on the right end face of the connecting disc 10, and the left end of the clamp body 20 is provided with a flange which is coaxially and fixedly connected with the connecting disc 10 through a screw.

As shown in fig. 2 and 3, the elastic taper sleeve 50 is a revolving body part provided with an inner hole, and the inner hole of the elastic taper sleeve 50 is a cylindrical inner hole; a plurality of first long grooves and second long grooves are axially formed in the elastic taper sleeve 50, the first long grooves are formed from the left end to the right end of the elastic taper sleeve 50, the second long grooves are formed from the right end to the left end of the elastic taper sleeve 50, and the first long grooves and the second long grooves are alternately arranged; the outer surface of the elastic taper sleeve 50 is a conical surface, and the small end of the conical surface is positioned at the left end of the elastic taper sleeve 50; a section of annular cylinder extends from the right end port of the elastic taper sleeve 50, and the diameter of an inner hole of the annular cylinder is equal to that of the inner hole of the elastic taper sleeve 50; and the outer surface of the annular cylindrical barrel is provided with an annular clamping groove for clamping the clamping plate 40.

As shown in fig. 3, the nut 30 is screwed to the clamp body 20, and the right end surface of the nut 30 is fixed to the chuck plate 40 by a screw. The outer surface of the right end of the nut 30 is a polygonal surface for being clamped by a wrench. The clamping plate 40 is clamped in an annular clamping groove at the outer side of the right end of the elastic taper sleeve 50, and the clamping plate 40 is formed by folding two semicircular thin plates.

A spanner is used for clamping the polygonal surface to rotate the nut 30 clockwise, the nut 30 pushes the elastic taper sleeve 50 to move axially towards the left through the clamping plate 40, and the taper hole at the right end of the clamp body 20 pushes the elastic taper sleeve 50 to contract radially. The cylindrical inner hole of the elastic taper sleeve 50 is reduced, the elastic bushing 70 is extruded, the elastic bushing is extruded to radially contract, and the cylindrical surface of the middle section of the machine head 90 is compressed, so that the purpose of positioning and clamping the machine head 90 is achieved.

As shown in fig. 1 and 3, a machine head 90 to be machined is inserted into the inner bore of the elastic bush 70, and a notch 78 for avoiding a cylindrical protrusion 94 of the machine head 90 is provided on the inner bore wall of the elastic bush 70. The elastic bushing 70 can be radially contracted or expanded by an external force due to the elasticity of the flexible diaphragm 75 and the presence of the U-shaped corrugations 77.

The working process of the drilling tool for the head of the rock drill in the embodiment is as follows:

the elastic bushing 70 is wrapped outside the middle cylindrical surface of the machine head 90, the drill clamp support frame 92 of the machine head 90 is placed towards the left direction, and the machine head wrapped with the elastic bushing is integrally inserted into the elastic taper sleeve 50 of the hole grinding tool, so that an inner hole of a port at the left end of the machine head 90 is matched with a second seam allowance at the right end of the positioning sleeve 60.

A spanner is used for clamping the polygonal surface to rotate the nut 30 clockwise, the nut 30 pushes the elastic taper sleeve 50 to move axially towards the left through the clamping plate 40, and the taper hole at the right end of the clamp body pushes the elastic taper sleeve 50 to contract radially. The cylindrical inner hole of the elastic taper sleeve 50 is reduced, the elastic bushing is extruded to radially contract, the cylindrical surface of the middle section of the machine head 90 is compressed, and the purpose of positioning and clamping the machine head 90 is achieved.

After the inner hole is ground, the nut 30 is rotated reversely, the nut 30 pushes the elastic taper sleeve 50 to move towards the right axial direction through the clamping plate 40, the elastic taper sleeve 50 elastically returns in the radial direction, the cylindrical inner hole at the right end of the elastic taper sleeve 50 is enlarged, the elastic bushing 70 is loosened, and the whole machine head wrapping the elastic bushing is pulled out of the clamp rightwards.

And replacing the other machine head and repeating the actions.

Where not otherwise indicated herein or enabled by the prior art, it will be appreciated that modifications and variations may be resorted to without departing from the scope of the invention as set forth in the appended claims.

Claims

1. An elastomeric bushing, characterized by: the elastic bushing (70) comprises a first arc-shaped bushing (71), a second arc-shaped bushing (72) and a fan-shaped wedge block (73), the sections of the first arc-shaped bushing (71) and the second arc-shaped bushing (72) are arc-shaped, and the first arc-shaped bushing (71), the second arc-shaped bushing (72) and the fan-shaped wedge block (73) enclose a sleeve-shaped flexible bushing; the first arc-shaped bushing (71) and the second arc-shaped bushing (72) are formed by enclosing a plurality of fan-shaped pressing blocks (74) and a plurality of flexible clapboards (75), the fan-shaped pressing blocks (74) and the flexible clapboards (75) are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks (74) and the flexible clapboards (75) are connected through an adhesive; a space is reserved between the outer surface of the flexible baffle plate (75) and the outer surface of the bushing; a space is left between the inner surface of the flexible diaphragm (75) and the inner surface of the liner.

2. The elastic bushing according to claim 1, wherein the flexible diaphragm (75) is made of a soft material, and the soft material is rubber.

3. The elastic bushing according to claim 1, characterized in that a thin-walled sleeve (76) is sleeved on the first arc-shaped bushing (71) and the second arc-shaped bushing (72) along the axial direction, and the thin-walled sleeve (76) is wrapped on the surfaces of the first arc-shaped bushing (71) and the second arc-shaped bushing (72); the thin walled sleeve (76) forms a U-shaped fold (77) both in the spacing between the outer surface of the flexible diaphragm (75) and the outer surface of the liner and in the spacing between the inner surface of the flexible diaphragm (75) and the inner surface of the liner.

4. A resilient bushing according to claim 3, characterized in that the thin-walled sleeve (76) is made of thin steel sheet.