CN110887628A - Clamp for rectangular cross-section test piece suitable for multi-axis vibration fatigue - Google Patents
Clamp for rectangular cross-section test piece suitable for multi-axis vibration fatigue Download PDFInfo
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- CN110887628A CN110887628A CN201911338533.XA CN201911338533A CN110887628A CN 110887628 A CN110887628 A CN 110887628A CN 201911338533 A CN201911338533 A CN 201911338533A CN 110887628 A CN110887628 A CN 110887628A
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- clamp
- rectangular
- test piece
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- section test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a clamp of a rectangular cross-section test piece suitable for multi-axis vibration fatigue, which is respectively suitable for rectangular cross-section test pieces with different sizes. The clamp I is composed of two sets of vice structures. The clamp II consists of a clamp body and a head countersunk head bolt, and is called a frog clamp due to the appearance characteristic. The clamp III consists of a clamp body, a front end pressing strip, a front bolt and a side bolt. The invention adopts three different structures to restrain the degrees of freedom of the rectangular section test pieces with different sizes in two horizontal directions, and restrains the degree of freedom in the vertical direction through clamping force. Therefore, the constraint of the degrees of freedom in three directions is realized, the structure is simple and stable, and the device is suitable for the condition of multi-directional vibration fatigue loading.
Description
Technical Field
The invention relates to three clamps of a rectangular section test piece suitable for multi-axis vibration fatigue, and belongs to the field of vibration test equipment.
Background
Along with the deepening of vibration research and the development of experimental science, the performance and the function of the vibration test bed are continuously improved, the application range is wider and wider, the frequency bandwidth is wider and wider, the excitation force range is wider and wider, and the excitation directions of simultaneous excitation of the same vibration test bed are more and more. The multi-direction excitation often needs to stick a strain gauge to measure strain, and the traditional round bar test piece or thin-wall round tube test piece does not have the condition of sticking the strain gauge because the surface is a curved surface, so that a thin plate or rectangular section test piece needs to be changed under the condition of multi-axis excitation. Because of this, the conventional clamp body for clamping a test piece having a circular cross section is not effective, and therefore, it becomes important to develop a clamp designed to be suitable for a test piece having a rectangular cross section.
Disclosure of Invention
The invention aims to develop and design a plurality of clamps of a rectangular section test piece suitable for multi-axis vibration fatigue to clamp the rectangular section test piece. The existing rectangular section test piece clamp can only clamp through clamping force clamped by two sides, and is heavy and high in cost. The clamp provided by the invention utilizes a double-vice structure, an encircling clamping structure and other structures to clamp the rectangular section test piece in two directions. The vibration exciter can be applied to environments such as multi-axis vibration fatigue tests, and can be mounted on a vibration exciter or a vibration table after clamping a test piece with a rectangular cross section. The clamp has the advantages of simple structure, stable and reliable performance, low cost and high practicability.
The technical scheme adopted by the invention is that the clamp is suitable for a multiaxial vibration fatigue rectangular-section test piece, the clamp clamps the degrees of freedom of the rectangular-section test piece in two horizontal directions through a rectangular clamp body, the constraint in the third direction is realized through clamping force, and the rectangular-section test piece is fixed on vibration equipment such as a vibration exciter or a vibration table through a surface through hole after being clamped, so that the clamp can be effectively applied to a multiaxial vibration environment. The technical features of the three clamps are described below.
The clamp I comprises a clamp body 1, a sliding block 2, an embedded block 3, an end block 4 and a threaded rotary rod 5. The clamp body 1 is L-shaped, two sliding rails are arranged on the inner wall of the L-shaped clamp body, and the sliding block 2 is arranged on the sliding rails of the clamp body 1 in a sliding fit manner; an embedded block 3 is arranged on the end face of the sliding block 2, an end block 4 is fixed outside the clamp body 1, a threaded hole is formed in the middle of the end block 4, and when a rectangular-section test piece is clamped, the rectangular-section test piece is placed at the included angle of the L-shaped inner wall of the clamp body 1; and (5) rotating the two threaded rotating rods until the test piece with the rectangular section is clamped by the two sliding blocks 2. The clamp I is suitable for a rectangular section test piece with the section side length of more than 20 mm. A rectangular clamp body is formed between the clamp body 1 and the slide block 2.
Fig. 2 shows a clamp body 1, two slide rails are arranged on the inner wall of the clamp body 1, four through holes at two ends are in bolted connection with two end blocks 4 (fig. 5), and three countersunk holes at the side edges are used for connecting a clamp to a vibrating table through bolts. Fig. 3 is a sliding block, which is connected with two embedding blocks of fig. 4 through bolts and is installed on the sliding rail of the clamp body 1 through sliding fit. Fig. 6 is a threaded screw rod threaded into the end block of fig. 5 by a threaded connection, one end of which forms a revolute pair with two of the insert blocks of fig. 4.
The clamp II is a single integral clamp, a clamping part is divided into a left part and a right part by a slot, a test piece is placed into a middle square slot during clamping, and the slots of the left part and the right part form a rectangular clamp body; the clamping is realized by screwing a countersunk bolt. The fixture II is suitable for rectangular section test pieces with the section side length of 10mm to 20 mm.
The clamp III comprises a clamp block 6, a pressing strip 7, a first short bolt 8, a second short bolt 9 and a long bolt 10. The clamp block 6 is of a square structure, a pair of side edges of the clamp block 6 are provided with a rectangular groove and a short threaded hole, and the pressing strip 7 is fixed on the side edge of the clamp block 6 through a first short bolt 8 and a second short bolt 9; the adjacent side of rectangle recess is equipped with long screw hole, and long screw hole communicates with each other with the side of rectangle recess, compresses tightly the rectangular cross section test piece through stay bolt 10. And a rectangular clamp body is formed between the clamp block 6 and the pressing strip 7.
The first bolt 8 and the second bolt 9 are identical, and the other parts are all one. The fixture III is suitable for small test pieces with the section side length of less than 10 mm.
In the clamp I, two sliding blocks 2 are respectively arranged on two sliding rails of a clamp body 1, and the sliding blocks 2 can slide along the sliding rails of the clamp body 1 to form two pairs of sliding pairs; the screw thread revolves the screw hole of stick 5 and end block 4 and carries out screw-thread fit, and two screw holes of end block 4 bottom are used for with 1 for the bolt fastening of pincers body and are linked, and two inlay pieces 3 again imbed in the fluting that slider 2 reserved after revolving the cooperation of stick 5 with the screw thread to fix on slider 2 through the bolt for the both sides through-hole, fix on the shaking table through three counter sink on the pincers body 1 with whole again.
In the clamp II: the fixture body is divided into a left part and a right part through the slot, the shape of the section of the test piece is formed in the middle of the slot, and a small round hole slightly wider than the slot is formed at the end of the slot so as to eliminate stress concentration at the position. And (4) after the test piece is placed, a countersunk bolt is used for screwing, so that the test piece is clamped. And then the whole clamp is fixed on the vibration table through the two counter bores at the rear end and the two through holes at the front end, so that the whole clamp body and the whole test piece are stably fixed on the table board. The clamp is called a frog clamp because of the appearance characteristics of the clamp.
In the fixture III: and placing the test piece into the groove of the clamp body 6, pressing the pressing sheet 7 tightly, and screwing the bolt 8 and the bolt 9 into the threaded hole of the clamp body 6 through the through hole of the pressing sheet 7 to clamp the test piece in one direction. The bolt 10 is screwed in until it abuts against the test piece to effect clamping of the test piece in the other direction. And then the whole body is fixed on the vibration table through a through hole on the clamp body 6. This anchor clamps are less to the cross-section, and the not big condition of exciting force, therefore the degree of freedom of two directions of test piece can be retrained completely to the clamp force of bolt 10 and preforming 7.
The invention adopts three different structures and forms to solve the clamping problem of the test piece with the rectangular section under the condition of multi-axis vibration fatigue. Simple structure is stable, and the practicality is strong. Compared with the prior art, the invention has the following effects.
1. Aiming at the rectangular section test piece, the invention solves the problem that the rectangular section test piece is less;
2. the invention can clamp the rectangular section test piece in two directions, and restrain the movement in the third direction through the clamping force, thereby being capable of dealing with the problem of multi-axis vibration;
3. the invention adopts three different structures to deal with test pieces with different cross section sizes, and has strong pertinence and simple and stable structure.
Drawings
FIG. 1 is an assembly view of a clamp I of the present invention;
FIG. 2 is a body of a clamp I of the present invention;
FIG. 3 is a block diagram of a clamp I of the present invention;
FIG. 4 is an insert of a clamp I of the present invention;
FIG. 5 is an end-block of a clamp I of the present invention;
FIG. 6 is a rotating rod of the clamp I of the present invention;
FIG. 7 is a perspective view of a clamp II of the present invention;
FIG. 8 is an exploded view of an assembly view of the clamp III of the present invention;
fig. 9 is a perspective view of a clamp block of the clamp III of the present invention.
In fig. 1: 1. the clamp comprises a clamp body, 2, a sliding block, 3, an embedded block, 4, an end block, 5 and a threaded rotating rod.
In fig. 8: 6. the clamp body is 7, the pressing sheet is 8, the first short bolt is 9, the second short bolt is 10 and the long bolt is arranged.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the clamp I comprises a clamp body 1, a sliding block 2, an embedded block 3, an end block 4 and a threaded screw rod 5. The clamp comprises a clamp body 1, two sliding blocks 2, four embedded blocks 3, two end blocks 4 and two threaded rotary rods 5. The clamp I is suitable for large-section test pieces with section side lengths of more than 20 mm. As shown in figure 7, the whole clamp is divided into a left part and a right part by a slot, a test piece is placed into a middle square groove during clamping, and a countersunk head bolt is screwed down to realize clamping. The fixture II is suitable for medium-sized test pieces with the section side length of 10mm to 20 mm. As shown in fig. 8, clip III: the clamp comprises a clamp block 6, a pressing strip 7, a first short bolt 8, a second short bolt 9 and a long bolt 10. The bolt 8 and the bolt 9 are the same, and the other parts are all one. The fixture III is suitable for small test pieces with the section side length of less than 10 mm.
When the clamp I is installed, the two sliding blocks 2 are firstly connected to the two sliding rails of the clamp body 1, the threaded rotary rod 5 passes through the threaded hole of the fixed end block 4, and then the two threaded holes at the bottom of the end block 4 as shown in figure 5 and the clamp body 1 (as a through hole in figure 2) are fixed through bolts. Two embedded blocks 3 in fig. 4 are used for wrapping one end of a thread rotating rod 5 and then are placed into a groove reserved in a sliding block 2 in fig. 3, the thread rotating rod is fixed on the sliding block through holes in two sides of the embedded blocks in fig. 4 by bolts, and then the whole body is fixed on a vibrating table through three counter bores on a clamp body 1. As shown in FIG. 2, the joint of the sliding rails on both sides of the clamp body is provided with a circular groove to prevent stress concentration.
As shown in the perspective view of FIG. 7, when the fixture II is installed, the fixture body is divided into a left part and a right part by the slot, the middle part of the slot is provided with the shape of the section of the test piece, and the end of the slot is provided with a small round hole slightly wider than the slot to eliminate the stress concentration therein. And (4) after the test piece is placed, a countersunk bolt is used for screwing, so that the test piece is clamped. And then the whole clamp is fixed on the vibration table through the two counter bores at the rear end and the two through holes at the front end, so that the whole clamp body and the whole test piece are stably fixed on the table board. The clamp is called a frog clamp because of the appearance characteristics of the clamp.
When the clamp III is installed, as shown in fig. 8, a test piece is placed in the groove of the clamp body 6, the pressing piece 7 is pressed tightly, and the bolt 8 and the bolt 9 are screwed into the threaded hole of the clamp body 6 through the through hole of the pressing piece 7 to clamp the test piece in one direction. The bolt 10 is screwed in until it abuts against the test piece to effect clamping of the test piece in the other direction. And then the whole body is fixed on the vibration table through a through hole on the clamp body 6. This anchor clamps are less to the cross-section, and the not big condition of exciting force, therefore the degree of freedom of two directions of test piece can be retrained completely to the clamp force of bolt 10 and preforming 7.
Claims (6)
1. Anchor clamps suitable for multiaxis vibration fatigue's rectangular section test piece, its characterized in that: the clamp clamps the degrees of freedom of a rectangular section test piece in two horizontal directions through the rectangular clamp body, realizes the restraint in the third direction through the clamping force, and is fixed on a vibration exciter or a vibration table through a surface through hole after clamping, so that the clamp can be effectively applied to a multi-axis vibration environment;
the clamp I comprises a clamp body (1), a sliding block (2), an embedded block (3), an end block (4) and a threaded rotating rod (5); the clamp body (1) is L-shaped, two sliding rails are arranged on the inner wall of the L-shape, and the sliding block (2) is arranged on the sliding rails of the clamp body (1) in a sliding fit manner; an embedded block (3) is arranged on the end face of the sliding block (2), an end block (4) is fixed outside the clamp body (1), a threaded hole is formed in the middle of the end block (4), and when a rectangular-section test piece is clamped, the rectangular-section test piece is placed at the included angle of the L-shaped inner wall of the clamp body (1); rotating the two threaded rotary rods (5) until the test piece with the rectangular section is clamped by the two sliding blocks (2); a rectangular clamp body is formed between the clamp body (1) and the slide block (2).
2. The jig for a rectangular-section test piece suitable for multi-axis vibration fatigue according to claim 1, characterized in that: the clamp I is suitable for a rectangular section test piece with the section side length of more than 20 mm.
3. Anchor clamps suitable for multiaxis vibration fatigue's rectangular section test piece, its characterized in that: the clamp clamps the degrees of freedom of a rectangular section test piece in two horizontal directions through the rectangular clamp body, realizes the restraint in the third direction through the clamping force, and is fixed on a vibration exciter or a vibration table through a surface through hole after clamping, so that the clamp can be effectively applied to a multi-axis vibration environment;
the clamp II is a single integral clamp, a clamping part is divided into a left part and a right part by a slot, a test piece is placed into a middle square slot during clamping, and the slots of the left part and the right part form a rectangular clamp body; the clamping is realized by screwing a countersunk bolt.
4. The jig for a rectangular-section test piece suitable for multi-axis vibration fatigue according to claim 1, characterized in that: the fixture II is suitable for rectangular section test pieces with the section side length of 10mm to 20 mm.
5. Anchor clamps suitable for multiaxis vibration fatigue's rectangular section test piece, its characterized in that: the clamp clamps the degrees of freedom of a rectangular section test piece in two horizontal directions through the rectangular clamp body, realizes the restraint in the third direction through the clamping force, and is fixed on a vibration exciter or a vibration table through a surface through hole after clamping, so that the clamp can be effectively applied to a multi-axis vibration environment;
the clamp III comprises a clamp block (6), a pressing strip (7), a first short bolt (8), a second short bolt (9) and a long bolt (10); the clamp block (6) is of a square structure, a pair of side edges of the clamp block (6) are provided with a rectangular groove and a short threaded hole, and the pressing strip (7) is fixed on the side edge of the clamp block (6) through a first short bolt (8) and a second short bolt (9); the adjacent edge of the rectangular groove is provided with a long threaded hole which is communicated with the side edge of the rectangular groove, and the rectangular section test piece is pressed tightly through a long bolt (10); the rectangular clamp body is formed between the clamp block (6) and the pressing bar (7).
6. The jig for a rectangular-section test piece suitable for multi-axis vibration fatigue according to claim 5, characterized in that: the fixture III is suitable for small test pieces with the section side length of less than 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911338533.XA CN110887628A (en) | 2019-12-23 | 2019-12-23 | Clamp for rectangular cross-section test piece suitable for multi-axis vibration fatigue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911338533.XA CN110887628A (en) | 2019-12-23 | 2019-12-23 | Clamp for rectangular cross-section test piece suitable for multi-axis vibration fatigue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110887628A true CN110887628A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911338533.XA Pending CN110887628A (en) | 2019-12-23 | 2019-12-23 | Clamp for rectangular cross-section test piece suitable for multi-axis vibration fatigue |
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| CN (1) | CN110887628A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105571808A (en) * | 2016-02-26 | 2016-05-11 | 浙江理工大学 | Clamp with all-freedom constraints for impact fatigue testing machine |
| CN107139094A (en) * | 2016-03-01 | 2017-09-08 | 成都红宇时代科技有限公司 | A kind of square parts clamping device |
| CN107345844A (en) * | 2017-08-07 | 2017-11-14 | 北京工业大学 | A kind of round cross-section rod vibration experiment clamping device |
| CN109048709A (en) * | 2018-08-07 | 2018-12-21 | 安徽龙锐模塑有限公司 | A kind of Novel fixture |
| CN208696862U (en) * | 2018-08-27 | 2019-04-05 | 平湖市涛强机械有限公司 | A kind of eccentric shaft positioning fixture |
| CN209566031U (en) * | 2019-01-24 | 2019-11-01 | 中山市华志模具精密设备科技有限公司 | A kind of right angle fixture |
-
2019
- 2019-12-23 CN CN201911338533.XA patent/CN110887628A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105571808A (en) * | 2016-02-26 | 2016-05-11 | 浙江理工大学 | Clamp with all-freedom constraints for impact fatigue testing machine |
| CN107139094A (en) * | 2016-03-01 | 2017-09-08 | 成都红宇时代科技有限公司 | A kind of square parts clamping device |
| CN107345844A (en) * | 2017-08-07 | 2017-11-14 | 北京工业大学 | A kind of round cross-section rod vibration experiment clamping device |
| CN109048709A (en) * | 2018-08-07 | 2018-12-21 | 安徽龙锐模塑有限公司 | A kind of Novel fixture |
| CN208696862U (en) * | 2018-08-27 | 2019-04-05 | 平湖市涛强机械有限公司 | A kind of eccentric shaft positioning fixture |
| CN209566031U (en) * | 2019-01-24 | 2019-11-01 | 中山市华志模具精密设备科技有限公司 | A kind of right angle fixture |
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Application publication date: 20200317 |
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| RJ01 | Rejection of invention patent application after publication |