CN215699565U - Screw thread tightening device - Google Patents

Abstract

The utility model discloses a thread tightening device, which comprises a tightening body, an angular contact bearing and a bearing seat, wherein the tightening body is provided with a first thread hole and a second thread hole; the tightening body is an annular piece, and an inner ring of the tightening body is provided with a first thread section, a bearing mounting groove and a second thread section; the bearing seat is of a cylindrical structure, and a bearing installation groove and an external thread section are machined in the bearing seat; the tightening body is in threaded butt joint with the external thread section of the side wall of the bearing seat through a second thread section of an inner ring of the tightening body, and an angular contact bearing is installed between the tightening body and the bearing seat; when the screwing body and the bearing seat are in a complete screwing state, the front section surface of the outer ring of the angular contact bearing is axially clamped with the front side surface of the bearing mounting groove of the screwing body, and the rear end surface of the inner ring of the angular contact bearing is axially clamped with the rear side surface of the bearing mounting groove of the bearing seat. The thread tightening device provided by the utility model reduces the disassembly force and prolongs the service life.

Description

Screw thread tightening device

Technical Field

The utility model relates to a thread tightening device, which is used for tightening two parts which are connected by threads and belongs to the field of product performance testing.

Background

The threaded connection mode is the most common mode for connecting two parts, and the conventional threads are screwed and loosened as follows: one part is fixed, the other part is clamped to rotate to be screwed, when one end face of the rotating piece is attached to the end face of the clamping piece, the threads are screwed to the position, and the clamping rotating piece rotates reversely to be loosened. But in some special cases, the rotating part can not be normally clamped due to structural reasons, such as a certain threaded butt joint part, as shown in fig. 1, the exposed part of the rotating part at the right end is an external thread section; a screw tightening device is then required to assist the docking. The traditional thread tightening device is a ring-shaped part with an inner thread matched with an outer thread of a rotating part, the thread tightening device is firstly fixed with the rotating part through threads, then the part is in thread butt joint, and after the butt joint is completed, the thread tightening device is dismounted. However, the screw thread screwing device is difficult to disassemble, the screw thread of the butted part is loosened during disassembly, and the butted part needs to be knocked vigorously sometimes, so that the butted part is easily damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that assembly parts are easy to loosen and damage and the like when a traditional thread tightening device is disassembled, and provides the thread tightening device.

The purpose of the utility model is realized by the following technical scheme:

the utility model relates to a thread tightening device, which comprises a tightening body, an angular contact bearing and a bearing seat;

the tightening body is an annular piece, a first thread section matched with the thread of a rotating part to be assembled is processed at the front section of the inner ring of the tightening body, a bearing mounting groove is processed at the middle part of the inner ring of the tightening body, and a second thread section in the opposite direction to the thread direction of the first thread section is processed at the rear section of the inner ring of the tightening body;

the bearing seat is of a cylindrical structure, a bearing installation groove is machined in the front section of the side wall of the bearing seat, and an external thread section matched with the second thread section of the inner ring of the tightening body is machined in the rear section of the side wall of the bearing seat;

the tightening body is in threaded butt joint with the external thread section of the side wall of the bearing seat through a second thread section of an inner ring of the tightening body, and an angular contact bearing is installed between the tightening body and the bearing seat; when the screwing body and the bearing seat are in a complete screwing state, the front section surface of the outer ring of the angular contact bearing is axially clamped with the front side surface of the bearing mounting groove of the screwing body, and the rear end surface of the inner ring of the angular contact bearing is axially clamped with the rear side surface of the bearing mounting groove of the bearing seat.

The side wall of the tightening body and the side wall of the bearing seat are both provided with wrenches which are uniformly distributed circumferentially.

Working process

When the threaded part is assembled, firstly, the screwing body and the bearing seat are screwed in place, then the rotating part to be assembled is screwed on the screwing piece in advance until the rear end face of the rotating part to be assembled is tightly attached to the inner side of the outer ring of the angular contact bearing, and the rotating part to be assembled and the threaded screwing device are fixed in a threaded manner; then, the screwing body is rotated to drive the rotating part to be assembled to be in threaded butt joint with the front end fixed assembly part; after the assembly part is in threaded butt joint, the bearing seat is controlled to rotate along the direction of the assembly part, and because the connecting threads between the bearing seat and the screwing body are opposite to the connecting threads of the assembly part, the rotation of the bearing seat along the direction of the assembly part enables the connecting threads between the bearing seat and the screwing body to be axially separated, and the connecting threads between the screwing body and the rotating part to be assembled cannot be loosened; when the connecting thread between the bearing seat and the screwing body is axially separated until an axial gap is formed between the outer ring of the angular contact bearing and the rear end face of the rotating part to be assembled, the screwing body is rotated in the reverse direction, so that the screwing body can be easily dismounted from the rotating part to be assembled.

Advantageous effects

According to the thread tightening device, the angular contact bearing is arranged between the tightening body and the bearing seat, so that when the device is disassembled, the end face of the tool and the end face of the part do not generate relative friction and displacement, and the rotation of the ball of the angular contact bearing replaces the relative friction and displacement, so that the disassembling force is greatly reduced, a solution is provided for the tightening of special parts, and the service life of the thread tightening device is greatly prolonged.

Drawings

FIG. 1 is a schematic view of an assembly structure of a threaded part to be assembled;

FIG. 2 is a schematic view of the construction of the screw tightening apparatus of the present invention;

in the figures, 1-the tightening body; 2-angular contact bearings; and 3, bearing seats.

Detailed Description

The utility model is further described with reference to the following figures and examples.

Examples

A screw tightening device of the present invention, as shown in fig. 2, includes a tightening body 1, an angular contact bearing 2, and a bearing housing 3;

the tightening body 1 is an annular piece, a first thread section matched with the thread of a rotating part to be assembled is processed at the front section of an inner ring of the tightening body 1, a bearing mounting groove is processed at the middle part of the inner ring of the tightening body 1, and a second thread section in the opposite direction to the thread of the first thread section is processed at the rear section of the inner ring of the tightening body 1;

the bearing seat 3 is of a cylindrical structure, a bearing installation groove is processed at the front section of the side wall of the bearing seat 3, and an external thread section matched with the second thread section of the inner ring of the tightening body 1 is processed at the rear section of the side wall of the bearing seat 3;

the tightening body 1 is in threaded butt joint with an external thread section of the side wall of the bearing seat 3 through a second thread section of an inner ring of the tightening body, and an angular contact bearing 2 is installed between the tightening body and the bearing seat 3; when the tightening body and the bearing seat 3 are in a complete screwing state, the front section surface of the outer ring of the angular contact bearing 2 is axially clamped with the front side surface of the bearing installation groove of the tightening body 1, and the rear end surface of the inner ring of the angular contact bearing 2 is axially clamped with the rear side surface of the bearing installation groove of the bearing seat 3.

The side wall of the tightening body 1 and the side wall of the bearing seat 3 are both provided with wrenches which are uniformly distributed circumferentially.

Working process

When the threaded part is assembled, firstly, the screwing body 1 and the bearing seat 3 are screwed in place, then the rotating part to be assembled is screwed on the screwing piece in advance until the rear end face of the rotating part to be assembled is tightly attached to the inner side of the outer ring of the angular contact bearing 2, and the rotating part to be assembled and the threaded screwing device are fixed in a threaded manner; then, the screwing body 1 is rotated to drive a rotating part to be assembled to be in threaded butt joint with a front end fixed assembly part; after the butt joint of the assembly part threads is finished, the bearing seat 3 is controlled to rotate along the direction of the assembly part, and because the connecting threads between the bearing seat 3 and the screwing body 1 are opposite to the connecting threads of the assembly part, the rotation of the bearing seat 3 along the direction of the assembly part enables the connecting threads between the bearing seat 3 and the screwing body 1 to be axially separated, and the connecting threads between the screwing body 1 and the rotating part to be assembled cannot be loosened; when the connecting thread between the bearing seat 3 and the tightening body 1 is axially separated to form an axial gap between the outer ring of the angular contact bearing 2 and the rear end face of the rotating part to be assembled, the tightening body 1 is rotated in the opposite direction, so that the tightening body 1 can be easily detached from the rotating part to be assembled.

Claims (2)

1. A screw tightening device is characterized in that: comprises a tightening body, an angular contact bearing and a bearing seat;

the tightening body is an annular piece, a first thread section matched with the thread of a rotating part to be assembled is processed at the front section of the inner ring of the tightening body, a bearing mounting groove is processed at the middle part of the inner ring of the tightening body, and a second thread section in the opposite direction to the thread direction of the first thread section is processed at the rear section of the inner ring of the tightening body;

the bearing seat is of a cylindrical structure, a bearing installation groove is machined in the front section of the side wall of the bearing seat, and an external thread section matched with the second thread section of the inner ring of the tightening body is machined in the rear section of the side wall of the bearing seat;

the tightening body is in threaded butt joint with the external thread section of the side wall of the bearing seat through a second thread section of an inner ring of the tightening body, and an angular contact bearing is installed between the tightening body and the bearing seat; when the screwing body and the bearing seat are in a complete screwing state, the front section surface of the outer ring of the angular contact bearing is axially clamped with the front side surface of the bearing mounting groove of the screwing body, and the rear end surface of the inner ring of the angular contact bearing is axially clamped with the rear side surface of the bearing mounting groove of the bearing seat.

2. A screw tightening device according to claim 1, wherein: the side wall of the tightening body and the side wall of the bearing seat are both provided with wrenches which are uniformly distributed circumferentially.

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