CN219302118U

CN219302118U - Rod piece clamping fixture for tensile testing machine

Info

Publication number: CN219302118U
Application number: CN202223274646.8U
Authority: CN
Inventors: 陈前生; 游健; 朱浔; 于辉洋
Original assignee: Chengdu Homin Technology Co Ltd
Current assignee: Chengdu Homin Technology Co Ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-07-04
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a rod clamping fixture for a tensile testing machine, which relates to the technical field of rod clamping fixture structures and comprises an inner cylinder body and an outer cylinder body, wherein the top of the inner cylinder body is closed, a connecting rod is fixedly connected to the top surface of the closed end, at least three inclined blocks are fixedly arranged on the bottom surface of the inner cylinder body along the circumferential direction of the bottom surface of the inner cylinder body, the outer wall of each inclined block is a conical surface, a clamping head is fixedly arranged on the inner wall of the lower end part of each inclined block, an arc cylindrical surface is arranged on the inner end surface of each clamping head, and the diameter of a center ring surrounded by each arc cylindrical surface is equal to the outer diameter of a rod; the bottom of the outer cylinder is fixedly provided with a conical cylinder communicated with the conical cylinder, an inner cylindrical surface of the outer cylinder is provided with an inner thread, the outer cylinder is fixedly arranged on the inner cylinder through the threaded connection of the inner thread and the outer thread, the conical cylinder is arranged outside each inclined block, and the inner conical surface of the conical cylinder is matched with the conical surface of each inclined block. The beneficial effects of the utility model are as follows: the tool time of the rod piece is greatly shortened, and the rod piece is clamped firmly.

Description

Rod piece clamping fixture for tensile testing machine

Technical Field

The utility model relates to the technical field of rod clamping fixture structures, in particular to a rod clamping fixture for a tensile testing machine.

Background

In the workshop, after cylindrical member production shaping, need adopt tensile testing machine to test its pulling force, tensile testing machine includes frame, centre gripping anchor clamps and stretching mechanism, and wherein centre gripping anchor clamps set up in stretching mechanism under, and centre gripping anchor clamps are used for the upper end of the fixed member of waiting to test of centre gripping, and stretching mechanism is used for centre gripping member's lower extreme and with the member downward stretching.

The structure schematic diagram of the clamping fixture is shown in fig. 1, and comprises a fixture body 1, a connecting rod 2 fixedly arranged on the top surface of the fixture body 1, wherein the upper end part of the connecting rod 2 is fixedly arranged on a frame of the tensile testing machine, the bottom of the fixture body 1 is provided with a groove, the bottom of the groove is fixedly provided with a horizontally arranged guide rail 3, a pressing block 4 is slidably arranged on the guide rail 3, the left side wall of the groove is in threaded connection with a screw rod 5, one end of the screw rod 5 is fixedly provided with a square head 6, the other end of the screw rod is rotatably arranged in the pressing block 4, a fixing block 7 is welded on the right side inner wall of the groove, and the fixing block 7 is oppositely arranged left and right of the pressing block 4.

Before the test, the workman inserts the one end of member 8 between fixed block 7 and briquetting 4, then rotates square head 6 with the spanner, and square head 6 drives lead screw 5 rotation, and lead screw 5 drives briquetting 4 and moves towards fixed block 7 direction, and after the motion is to the certain position, the upper end of member 8 is held between briquetting 4 and fixed block 7 to realized the centre gripping to member 8 fixed, as shown in fig. 2. During testing, the lower end part of the rod piece 8 is clamped by the stretching mechanism on the tensile testing machine, and then the stretching mechanism is controlled to move downwards, so that the rod piece 8 can be subjected to tensile testing.

However, such a clamping jig, while being capable of clamping the rod member 8, still suffers from the following technical drawbacks in actual operation by the worker:

I. when the rod 8 is clamped by the fixing block 7 and the pressing block 4, the rod 8 is always in an inclined state, but not in a vertical state required by the test, and workers are required to repeatedly clamp the rod 8 in the later stage so that the rod 8 is in the vertical state, which clearly increases the clamping tool time of the rod, and further greatly reduces the test efficiency of the rod.

II. The rod piece 8 is clamped and fixed only through the pressing block 4 and the fixed block 7, the contact surface is small, and the technical defect of unstable clamping exists. Therefore, there is a need for a clamping fixture that greatly shortens the rod tooling time and clamps the rod firmly.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides the rod clamping fixture for the tensile testing machine, which has a compact structure, greatly shortens the rod tooling time and clamps the rod firmly.

The aim of the utility model is achieved by the following technical scheme: the rod clamping fixture for the tensile testing machine comprises an inner cylinder body and an outer cylinder body, wherein the top of the inner cylinder body is closed, a connecting rod is fixedly connected to the top surface of the closed end, at least three inclined blocks are fixedly arranged on the bottom surface of the inner cylinder body along the circumferential direction of the inner cylinder body, the inclined blocks are arranged at an included angle with the axis of the inner cylinder body, the outer wall of each inclined block is a conical surface, clamping heads are fixedly arranged on the inner wall of the lower end part of each inclined block, circular arc cylindrical surfaces are arranged on the inner end surface of each clamping head, the diameter of a central ring surrounded by each circular arc cylindrical surface is equal to the outer diameter of the rod, and external threads are arranged on the outer cylindrical surface of the inner cylinder body;

the bottom of the outer cylinder body is fixedly provided with a conical cylinder communicated with the conical cylinder, the inner cylindrical surface of the outer cylinder body is provided with an internal thread, the outer cylinder body is fixedly arranged on the inner cylinder body through the threaded connection of the internal thread and the external thread, the conical cylinder is arranged outside each inclined block, and the inner conical surface of the conical cylinder is matched with the conical surface of each inclined block.

The blind end of interior barrel is the apron, and the apron passes through locking screw to be fixed in on the tip of interior barrel, the connecting rod welds on the top surface of apron.

The inclined blocks are uniformly distributed on the bottom surface of the inner cylinder body, and the inclined blocks and the inner cylinder body are integrally formed.

The conical cylinder and the outer cylinder are coaxially arranged.

The sleeve is welded on the bottom surface of the cover plate and is arranged right above the center ring, and the inner diameter of the sleeve is equal to the outer diameter of the rod piece.

The utility model has the following advantages: the structure is compact, the tool time of the rod piece is greatly shortened, and the rod piece is clamped firmly.

Drawings

FIG. 1 is a schematic view of a clamping fixture;

FIG. 2 is a schematic diagram illustrating the operation of the clamping fixture of FIG. 1;

FIG. 3 is a schematic diagram of the structure of the present utility model;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a schematic illustration of the connection of the inner barrel to the connecting rod;

FIG. 6 is a sectional view B-B of FIG. 5;

FIG. 7 is a schematic illustration of the connection of an outer cylinder to a tapered cylinder;

FIG. 8 is a schematic illustration of the insertion of a rod into a sleeve;

FIG. 9 is a schematic view of the clamping of the lever;

in the figure, a 1-clamp body, a 2-connecting rod, a 3-guide rail, a 4-press block, a 5-screw rod, a 6-square head, a 7-fixed block, an 8-rod piece, a 9-inner cylinder, a 10-outer cylinder, an 11-inclined block, a 12-clamp head, a 13-circular arc cylindrical surface, a 14-external thread, a 15-conical cylinder, a 16-internal thread, a 17-cover plate and a 18-sleeve.

Detailed Description

The utility model is further described below with reference to the accompanying drawings, the scope of the utility model not being limited to the following:

as shown in fig. 3-8, a rod clamping fixture for a tensile testing machine comprises an inner cylinder 9 and an outer cylinder 10, wherein the top of the inner cylinder 9 is closed, a connecting rod 2 is fixedly connected to the top surface of the closed end, at least three inclined blocks 11 are fixedly arranged on the bottom surface of the inner cylinder 9 along the circumferential direction of the bottom surface, the inclined blocks 11 are uniformly distributed on the bottom surface of the inner cylinder 9, the inclined blocks 11 and the inner cylinder 9 are integrally formed, the inclined blocks 11 and the axis of the inner cylinder 9 are arranged in an included angle manner, the outer wall of each inclined block 11 is a conical surface, a chuck 12 is fixedly arranged on the inner wall of the lower end part of each inclined block 11, an arc cylindrical surface 13 is arranged on the inner end surface of each chuck 12, the diameter of a central ring surrounded by each arc cylindrical surface 13 is equal to the outer diameter of the rod, and an external thread 14 is arranged on the outer cylindrical surface of the inner cylinder 9; the bottom of the outer cylinder 10 is fixedly provided with a conical cylinder 15 communicated with the conical cylinder 15, the conical cylinder 15 and the outer cylinder 10 are coaxially arranged, an inner thread 16 is arranged on the inner cylindrical surface of the outer cylinder 10, the outer cylinder 10 is fixedly arranged on the inner cylinder 9 through the threaded connection of the inner thread 16 and the outer thread 14, the conical cylinder 15 is arranged outside each inclined block 11, and the inner conical surface of the conical cylinder 15 is matched with the conical surface of each inclined block 11.

As shown in fig. 3 to 8, the closed end of the inner cylinder 9 is a cover plate 17, the cover plate 17 is fixed on the top end of the inner cylinder 9 through a locking screw, and the connecting rod 2 is welded on the top surface of the cover plate 17. The sleeve 18 is welded on the bottom surface of the cover plate 17, the sleeve 18 is arranged right above the central ring, and the inner diameter of the sleeve 18 is equal to the outer diameter of the rod piece.

The working process of the utility model is as follows:

s1, a worker fixedly installs the upper end part of a connecting rod 2 on a frame of a tensile testing machine so as to fix the clamping fixture on the tensile testing machine;

s2, clamping and fixing the rod piece to be tested: the worker sequentially penetrates the upper end part of the rod piece 8 to be tested through the center ring and the inner cylinder 9 from bottom to top and inserts the rod piece 8 into the sleeve 18, and the rod piece 8 is in a vertical state at the moment; the worker rotates the outer cylinder 10 by hand, under the cooperation of the internal thread 16 of the outer cylinder 10 and the external thread 14 of the inner cylinder 9, the outer cylinder 10 moves upwards along the axis of the inner cylinder 9, meanwhile, the outer cylinder 10 drives the conical cylinder 15 to synchronously move downwards, the inner cone surface of the conical cylinder 15 moves towards the cone surface direction of each inclined block 11, when the conical cylinder 15 rises to a certain height, the inner cone surface of the conical cylinder 15 presses the inclined blocks 11, and the inclined blocks 11 drive the clamping heads 12 to synchronously move towards the rod 8, so that the rod 8 is clamped and fixed;

in step S2, since the upper end of the rod 8 is just matched with the inner hole of the sleeve 18, and the cylindrical surface of the rod 8 is just matched with the central ring surrounded by each circular arc cylindrical surface 13, the rod 8 is in a vertical state rapidly, so that after the rod 8 is clamped, the rod 8 is also in a vertical state, and further, the rod 8 is ensured to be subjected to a tensile test in the vertical state, therefore, compared with the clamping fixture shown in fig. 1, the clamping fixture does not need a worker to repeatedly clamp the rod 8 to enable the rod 8 to be in the vertical state, the clamping fixture time of the rod 8 is greatly shortened, and the testing efficiency of the rod 8 is greatly improved.

In addition, the clamping fixture clamps the rod piece 8 through the three chucks 12, compared with the clamping fixture shown in fig. 1, the clamping area is larger, the clamping force is increased, and the clamping is firmer.

S3, after the rod piece 8 is clamped and fixed, a worker can operate the tensile testing machine to enable a stretching mechanism on the tensile testing machine to clamp the lower end portion of the rod piece 8, and then the stretching mechanism is controlled to move downwards, so that the rod piece 8 can be subjected to tensile testing.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. Rod piece clamping fixture for tensile testing machine, its characterized in that: the novel cylindrical shell comprises an inner cylinder body (9) and an outer cylinder body (10), wherein the top of the inner cylinder body (9) is closed, a connecting rod (2) is fixedly connected to the top surface of the closed end, at least three inclined blocks (11) are fixedly arranged on the bottom surface of the inner cylinder body (9) along the circumferential direction of the inner cylinder body, the inclined blocks (11) are arranged at an included angle with the axis of the inner cylinder body (9), the outer wall of each inclined block (11) is a conical surface, a clamping head (12) is fixedly arranged on the inner wall of the lower end part of each inclined block (11), an arc cylindrical surface (13) is arranged on the inner end surface of each clamping head (12), the diameter of a central ring surrounded by each arc cylindrical surface (13) is equal to the outer diameter of a rod piece, and external threads (14) are arranged on the outer cylindrical surface of the inner cylinder body (9);

the bottom of outer barrel (10) has set firmly toper section of thick bamboo (15) rather than the intercommunication, is provided with internal thread (16) on the interior cylinder of outer barrel (10), and outer barrel (10) are fixed in on interior barrel (9) through internal thread (16) and external screw thread (14) threaded connection, and toper section of thick bamboo (15) set up in the outside of each sloping block (11), and the interior conical surface of toper section of thick bamboo (15) cooperatees with the conical surface of sloping block (11).

2. The bar clamping jig for a tensile testing machine according to claim 1, wherein: the closed end of the inner cylinder body (9) is a cover plate (17), the cover plate (17) is fixed on the top end part of the inner cylinder body (9) through a locking screw, and the connecting rod (2) is welded on the top surface of the cover plate (17).

3. The bar clamping jig for a tensile testing machine according to claim 1, wherein: the inclined blocks (11) are uniformly distributed on the bottom surface of the inner cylinder body (9), and the inclined blocks (11) and the inner cylinder body (9) are integrally formed.

4. The bar clamping jig for a tensile testing machine according to claim 1, wherein: the conical cylinder (15) is coaxially arranged with the outer cylinder body (10).

5. The bar clamping jig for a tensile testing machine according to claim 2, wherein: a sleeve (18) is welded on the bottom surface of the cover plate (17), the sleeve (18) is arranged right above the center ring, and the inner diameter of the sleeve (18) is equal to the outer diameter of the rod piece.