CN110595879A - A Fixture Suitable for Torsional Fatigue Test of Samples of Various Specifications - Google Patents

Abstract

The invention relates to a fixture suitable for torsion fatigue test of specimens of various specifications, which comprises two oppositely arranged fixture bodies, that is, a first fixture body and a second fixture body, and the first fixture is connected with a swing cylinder as a driving end , the second clamping body is fixed to the bracket through the expansion sleeve and the torque sensor as a fixed end, and the two clamping bodies jointly clamp the sample to complete the torsional fatigue test; the clamping body adopts a piston-type oil cylinder structure, including a cylinder body and a The piston rod is open at the front end of the cylinder body. The front end of the piston rod is connected to a pair of clamping blocks and passively moves inside and outside the opening of the cylinder body. When the cylinder body is axially displaced along the piston rod under the action of high-pressure hydraulic oil, The opening of a pair of clamping blocks will be reduced or enlarged, thereby clamping or loosening the sample, and the clamping block clamps the sample and rotates positively and negatively with the clamp body under the drive of the swing cylinder. The jig is convenient to replace clamp blocks, reduces labor intensity and production cost, and improves production efficiency.

Description

A Fixture Suitable for Torsional Fatigue Test of Samples of Various Specifications

technical field

The invention relates to a fixture, in particular to a fixture suitable for torsional fatigue tests on samples of various specifications.

Background technique

The general material samples for torsional fatigue test are bars with different diameters. At present, the clamping sleeves are used to clamp the bar samples on the market. For samples with different diameters, the corresponding expansion sleeves are replaced. The method has high labor intensity and low production efficiency, and it is necessary to prepare enough expansion sleeves of various specifications, and the cost is relatively high.

Contents of the invention

The object of the present invention is to provide a fixture suitable for torsion fatigue test of specimens of various specifications. The jig is convenient to replace clamp blocks, reduces labor intensity and production cost, and improves production efficiency.

To achieve the above object, the present invention adopts the following technical solutions:

A fixture suitable for torsional fatigue tests on specimens of various specifications, comprising two oppositely arranged fixture bodies, namely a first fixture body and a second fixture body, the first fixture is connected to a swing cylinder as a driving end, and the The second clamp body is fixed to the bracket through the expansion sleeve and the torque sensor as the fixed end, and the two clamp bodies jointly clamp the sample to complete the torsional fatigue test; the clamp body adopts a piston-type oil cylinder structure, including a cylinder body and a piston rod, The front end of the cylinder body is open, and the front end of the piston rod is connected to a pair of clamping blocks and passively moves inside and outside the opening of the cylinder body. When the cylinder body is axially displaced along the piston rod under the action of high-pressure hydraulic oil, the pair of clamping blocks The opening of the clamp will decrease or increase, thereby clamping or loosening the sample, and the clamp block clamps the sample and rotates positively and negatively with the clamp body under the drive of the swing cylinder.

Further, a guide sleeve and a positioning pin for preventing relative rotation between the cylinder and the piston rod are provided between the piston rod and the cylinder.

Further, the rear end of the clamp body is buckled with a positioning end cap.

Further, the rear end of the piston rod passes through the support seat and is connected to the swing cylinder through a diaphragm coupling, and the swing cylinder rotates forward and backward to drive the piston rod to rotate, that is, the clamp body rotates positively and negatively.

Further, two pairs of bearings are installed in the support base, and one end of the piston rod passes through the bearings and is connected with the diaphragm coupling.

Further, the clamping block is connected to the front end of the piston rod through a screw and a spring, and the clamping block slides in the guide groove at the front end of the cylinder under the drive of the cylinder, and is reset by the restoring force of the spring.

Further, the side of the clamping block opposite to the clamping surface is an inclined surface, and the inclined surface of the clamping block frictionally fits with the inclined surface of the guide groove.

Further, the cross-section of the clamping surface of the clamping block is V-shaped.

Compared with prior art, the beneficial effect of the present invention is:

The fixture provided by the present invention is applicable to the torsional fatigue test of samples of various specifications. The piston-type oil cylinder is used to drive the clips to clamp or loosen the samples. According to the samples of different sizes, multiple sets of V-shaped clips can be prepared. The clamping range of each set of clamping blocks depends on the axial displacement of the cylinder body relative to the piston rod in the clamping body. The test can be performed by simply replacing the clamping blocks according to the sample size. The operation is simple, reducing labor intensity and production costs, and improving production. efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the embodiments. Obviously, the accompanying drawings in the following description are only described in the present invention For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings.

Fig. 1 is the front view of the clamp that is applicable to the torsional fatigue test of various specification samples of the present invention;

Fig. 2 is the not sectional view of clamp body of the present invention;

Fig. 3 is the side view of clamp block of the present invention;

Fig. 4 is the front view of clamp block of the present invention;

Fig. 5 is a side view of the piston rod of the first clamp body of the present invention;

Fig. 6 is a front view of the piston rod of the first clamp body of the present invention.

Detailed ways

In order to make those skilled in the art better understand the technical scheme of the present invention, the present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1-6, a fixture suitable for torsional fatigue tests on specimens of various specifications includes two oppositely arranged fixture bodies, that is, the first fixture body and the second fixture body, and the first fixture and the swing The cylinder 10 is connected as the active end, and the second clamp body is fixed to the bracket 14 as the fixed end through the expansion sleeve 12 and the torque sensor 13, and the two clamp bodies jointly clamp the sample to complete the torsional fatigue test; the clamp body adopts Piston-type oil cylinder structure, including cylinder body 2 and piston rod 3, the front end of the cylinder body 2 is open, the front end of the piston rod 3 is connected to a pair of clamping blocks 1 and passively moves inside and outside the opening of the cylinder body 2, when the cylinder body 2 is under high pressure When the axial displacement occurs along the piston rod 3 under the action of hydraulic oil, the openings of the pair of clamp blocks 1 will decrease or increase, thereby clamping or loosening the sample 11, and the clamp blocks 1 clamp the sample 11 in the Driven by the oscillating cylinder 10, the clamp body is driven to rotate positively and negatively.

As a preferred real-time method, a guide sleeve 4 and a positioning pin 5 for preventing relative rotation between the cylinder body 2 and the piston rod 3 are provided between the piston rod 3 and the cylinder body 2 . The rear end of the clamp body is buckled with a positioning end cap 6 .

The rear end of the piston rod 3 passes through the support seat 7 and is connected to the swing cylinder 10 through the diaphragm coupling 9, and the swing cylinder 10 rotates to drive the piston rod 3 to rotate in the positive and negative swing angles, that is, the positive and negative swing angles of the clip body rotate. The support seat 7 is equipped with two pairs of bearings 8, one end of the piston rod 3 passes through the bearing 8 and is connected with the diaphragm coupling 9, the function of the bearing 8 is to increase the support length of the rear end of the piston rod 3, so as to prevent the clamp body from being damaged by its own weight. Under the action of the sag, ensure that the coaxiality of the clamped sample 11 basically does not change.

The clamp block 1 is connected to the front end of the piston rod 3 through a screw 15 and a spring 16. The clamp block 1 slides in the guide groove 17 at the front end of the cylinder body 2 under the drive of the cylinder body 2, and resets by the restoring force of the spring 16. The side of the clamping block 1 opposite to the clamping surface is an inclined surface, and the inclined surface of the clamping block 1 is in frictional fit with the inclined surface of the guide groove 16 . The clamping surface section of the clamping block 1 is V-shaped. The clamp block 1 is equipped with multiple sets of V-shaped clamp blocks. The clamping range of each set of clamp blocks 1 depends on the axial displacement of the cylinder body 2 relative to the piston rod 3 in the clamp body. According to samples of different size ranges, Simply replace clamp block 1 to test.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (8)

1. a clamp that is applicable to the torsional fatigue test of multiple specification samples, is characterized in that: comprise two clamp bodies that are arranged oppositely, i.e. the first clamp body and the second clamp body, the first clamp and the swing cylinder ( 10) connected as the active end, the second clamp body is fixed to the bracket (14) as the fixed end through the expansion sleeve (12) and the torque sensor (13), and the two clamp bodies jointly clamp the sample to complete the torsional fatigue test ; The clamp body adopts a piston-type oil cylinder structure, including a cylinder body (2) and a piston rod (3), the front end of the cylinder body (2) is open, and a pair of clamping blocks (1) are connected to the front end of the piston rod (3) And passively move inside and outside the opening of the cylinder (2), when the cylinder (2) is axially displaced along the piston rod (3) under the action of high-pressure hydraulic oil, the opening of the pair of clamping blocks (1) will be reduced Small or large, so as to clamp or loosen the sample (11), the clamp block (1) clamps the sample (11) and is driven by the swing cylinder (10) to follow the clamp body to perform positive and negative swing angle rotation. 2. The fixture applicable to the torsional fatigue test of various specifications of samples according to claim 1, characterized in that: a guide sleeve (4) is provided between the piston rod (3) and the cylinder (2) to prevent A positioning pin (5) for relative rotation between the cylinder (2) and the piston rod (3). 3. The clamp suitable for torsional fatigue tests on samples of various specifications according to claim 1, characterized in that: the rear end of the clamp body is fastened with a positioning end cover (6). 4. The fixture suitable for torsional fatigue tests on samples of various specifications according to claim 1, characterized in that: the rear end of the piston rod (3) passes through the support seat (7) and passes through the diaphragm coupling The device (9) is connected with the swing cylinder (10), and the swing cylinder (10) rotates forward and backward to drive the piston rod (3) to rotate, that is, the clamp body rotates positively and negatively. 5. The clamp suitable for torsional fatigue test of samples of various specifications according to claim 4, characterized in that: two pairs of bearings (8) are installed in the support seat (7), and one end of the piston rod (3) is worn through The bearing (8) is connected with the diaphragm coupling (9). 6. The fixture suitable for torsional fatigue tests on samples of various specifications according to claim 1, characterized in that: the clamp block (1) is connected to the piston rod (3) by a screw (15) and a spring (16). ) front end, the clip block (1) slides in the guide groove (17) at the front end of the cylinder body (2) under the drive of the cylinder body (2), and resets by the restoring force of the spring (16). 7. The fixture suitable for torsional fatigue tests on samples of various specifications according to claim 6, characterized in that: the opposite side of the clamping block (1) to the clamping surface is an inclined plane, and the clamping block (1) The inclined-plane friction fits with the inclined-plane of guide groove (17). 8. The clamp suitable for torsional fatigue tests on samples of various specifications according to claim 7, characterized in that: the clamping surface section of the clamping block (1) is V-shaped.