Clamp device for material tensile test

Through the fixture device that coordinate the springs and spring, the fixture in the existing technology is incorrect, the manual knob is difficult to control and insufficient friction of the clamping. The effect of clamping.

CN222419791UActive Publication Date: 2025-01-28CHANGFEI (JIANGSU) OCEAN TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202420712973.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-09
Publication Date
2025-01-28
Estimated Expiration
2034-04-09

AI Technical Summary

Technical Problem

In the prior art, the upper and lower clamp center connection lines during the installation process are not on the same perpendicular line, which causes the longitudinal axis of the sample to be in a non-vertical state, affecting the measurement results; the manual knob is not easy to control the force, resulting in inconsistent clamping tightness, which may lead to The specimen slips or breaks; the contact surface of the clamp is made of metal and lacks friction, so the specimen is prone to slip.

Method used

Use the fixture device that combines the exercise arm and spring, and ensure that the block is at the center position and the distance is limited through the limit slot and the limited sale. The mass rubber material is equipped with uniform friction texture to enhance friction to prevent the sample from slipping.

Benefits of technology

The problem of inconsistent connection between the upper and lower fixture center of the fixture is solved to ensure that the vertical axis of the sample is vertical, and the horizontal tensile force affects the measurement results. The rubber material and friction texture design of the block meets the needs of stretching tests for various samples.

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Abstract

The utility model discloses a clamp device for a material tensile test. The clamp device comprises a locking column connected with tension equipment; one end of the clamp body is connected with the other end of the locking column, and the other end of the clamp body is provided with a vertically-arranged limiting groove; the moving arm, the first right-angle arm and the second right-angle arm are arranged in a crossed mode and hinged through a limiting bolt pin, and the limiting bolt pin is assembled in the limiting groove. One ends of the first and second straight arms are respectively hinged to two sides of the clamp main body, and the other ends of the first and second straight arms are respectively hinged to one ends of the first and second right-angle arms through long bolt pins; a pressing handle is arranged at the other end of the second right-angle arm; two ends of the springs are respectively connected with the two long bolt pins; the clamping blocks are respectively connected with the other ends of the first right-angle arm and the second right-angle arm; and the pressing handle is lifted to overcome the spring force so as to separate the pair of clamping blocks. According to the utility model, the moving arm and the spring are adopted, so that the upper and lower stresses are consistent, and the sample is ensured not to deviate; a symmetrical structure is adopted, so that the test sample can be vertically placed between the clamping blocks, and the test sample is only stressed in the vertical direction.
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Description

Technical Field

[0001] The utility model relates to the technical field of submarine cable testing, in particular to a clamp device used for material tensile testing. Background Art

[0002] In the manufacture of submarine cables, it is necessary to measure the tensile strength and elongation at break of raw materials such as water blocking tapes and insulating shielding material sheets. When the sample is clamped by the fixture, the longitudinal axis of the sample should coincide with the center line of the upper and lower fixtures, and the clamping should be appropriately tight to prevent the sample from slipping or breaking in the fixture. When clamping a film, the fixture should be lined with elastic materials such as rubber.

[0003] like Figure 1 As shown, the clamp used for the tensioning equipment in the prior art includes: a clamp body 7, a movable clamp block 8, a fixed clamp block 9, a manual knob 10, etc. The movable clamp block 8 is rotated to fit with the fixed clamp block 9 by the manual knob 10, and the clamp body 7 is installed in the fixed seat 11 of the tensioning equipment and fixed by pins; both clamp blocks are made of metal. In order to meet relevant requirements, a surface friction elastic tape is set on the contact surface of the two clamp blocks as an inner lining.

[0004] However, during the installation of the above-mentioned clamp, since the upper and lower clamps are installed oppositely, the center lines of the upper and lower clamps are not on the same vertical line, which makes the longitudinal axis of the specimen non-vertical. During the test, in addition to the vertical tension, horizontal tension will also be generated, affecting the measurement results; and it is not easy to control the force with the manual knob. During the clamping of the specimen, the tightness of the upper and lower clamps is inconsistent, resulting in more force on one side, causing the specimen to slip or break in the clamp; the contact surface of the clamp is made of metal and has no friction, so the specimen is easy to slip. If an elastic tape with surface friction is set on the contact surface, as the tension gradually increases during the test, the elastic tape will be slightly displaced, and the force curve of the specimen will easily fluctuate. Utility Model Content

[0005] The utility model aims to provide a clamp device for material tensile testing in view of the above-mentioned deficiencies in the prior art, so as to solve the problems that the center connection lines of the upper and lower clamps are not on the same vertical line and the manual knob is not easy to control the force.

[0006] The technical solution of the utility model is as follows:

[0007] A clamp device for material tensile testing, characterized in that it includes a locking column, a clamp body, a moving arm, a pair of springs, and a pair of clamping blocks, specifically:

[0008] A locking column, one end of which is used to connect with the tensioning device;

[0009] A clamp body, one end of which is connected to the other end of the locking column and the other end of which is provided with a vertically arranged limiting groove;

[0010] The moving arm comprises a first right-angle arm, a first straight arm, a second right-angle arm and a second straight arm; the first and second right-angle arms are cross-arranged and hinged by a limit pin, and the limit pin is slidably assembled in a limit groove; one end of the first and second straight arms are respectively hinged to two sides of the clamp body by a short pin, and the other end of the first and second straight arms are respectively hinged to one end of the first and second right-angle arms by a long pin; a pressing handle is provided at the other end of the first or second right-angle arm;

[0011] A pair of springs are arranged in parallel, the outer side wall of the long pin is provided with a slot matching the end of the spring, and the two ends of each spring are respectively connected to two long pins;

[0012] A pair of clamping blocks are arranged opposite to each other and are respectively connected to the other ends of the first and second right-angle arms; the pair of clamping blocks are separated by lifting and pressing the handle to overcome the spring force.

[0013] In the above scheme, the two ends of the clamp body are connected to the locking column and the moving arm respectively, and a limit groove is provided in the middle of the end of the clamp body, which is used to cooperate with the limit pin, so as to ensure that a pair of clamps are always in the center position, and the opening distance between the pair of clamps can be limited to prevent excessive opening beyond the spring deformation range and damage to the spring. When the clamp is in use, the clamp is locked on the tension device, and the pressing handle is displaced in the direction of the corresponding locking column to overcome the spring force, so that the pair of clamps are opened, and the sample is vertically placed in the center of the clamp. The pressing handle is released, and the pair of clamps automatically close under the action of the spring force to clamp the sample and perform a tensile test. Through the cooperation of the spring and various components, a pair of clamps adaptively clamp the sample, and the upper and lower forces are consistent, avoiding problems such as the connection line of the upper and lower clamp centers not being on the same vertical line and the manual knob being difficult to control the force.

[0014] Furthermore, the tensioning device is provided with a fixed seat, and the fixed seat has a cylindrical cavity (matching the size of one end of the locking column), and a fixing hole is provided on the side wall of the cylindrical cavity; one end of the locking column is provided with a fixing hole, and one end of the locking column is installed in the cylindrical cavity of the tensioning device fixed seat, and is fixed by a pin passing through the fixing holes of the two.

[0015] Furthermore, the other end of the locking column is provided with a fixing hole, the end face of the clamp body is provided with a cylindrical cavity (matching the size of the other end of the locking column), and the side wall of the cylindrical cavity is provided with a fixing hole; the other end of the locking column is installed in the cylindrical cavity of the clamp body, and is fixed by a pin passing through the fixing holes of the two. The clamp also includes an auxiliary locking knob, which is sleeved outside the locking column and is threadedly screwed with the outer wall of the locking column; the auxiliary locking knob is locked and pressed against the end face of the clamp body, at which time, the fixing hole of the clamp body, the fixing hole of the locking column, and the pin are tightly matched to lock the locking column and the clamp body.

[0016] Furthermore, a pair of first connecting ears is provided on one side of the clamp body, and a second connecting ear is provided on the other side, the pair of first connecting ears jointly clamp one end of the hinged first straight arm, the second straight arms are arranged in pairs, and a pair of second straight arms clamp the hinged second connecting ears; the first right-angle arms are arranged in pairs and jointly clamp the other end of the hinged first straight arm.

[0017] Furthermore, the clamp also includes a slide rail, and a horizontally arranged slide rail groove is provided on the same side of a pair of clamping blocks, and the two slide rail grooves are connected; the slide rail is placed in the two slide rail grooves and is fixedly connected to one of the slide rail grooves by bolts. When the clamping blocks are opened and closed, it is ensured that the two clamping blocks always move on the same horizontal line to avoid the clamping blocks from flipping at an angle.

[0018] Furthermore, a pair of clamps are made of hard rubber material, which has a certain elasticity and can meet the requirements of film sample testing, avoiding damage to the sample. The contact surface of the clamp is provided with a uniform friction texture, so that the sample is evenly stressed during the stretching process, avoiding the sample from slipping or breaking due to excessive stress.

[0019] Compared with the prior art, the utility model adopts the combination of a moving arm and a spring to replace the manual clamping process, so that the upper and lower forces are consistent, and the operation is simplified, ensuring that the sample will not be positionally offset during test preparation; the device adopts a symmetrical structure, even if the upper and lower installation directions are opposite, it can ensure that the sample can be vertically placed in the middle of the clamping block, so that the sample is only subjected to force in the vertical direction; the clamping block is made of elastic material and is provided with a friction surface, which can meet the needs of any sample that needs to be subjected to a tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a clamp used for a tension device in the background technology;

[0021] Figure 2 It is a schematic diagram of the structure of the utility model;

[0022] Figure 3 It is the structural explosion diagram of the utility model;

[0023] Figure 4 This is a schematic diagram of the installation of the utility model and the tension equipment fixing seat;

[0024] Figure 5 It is a schematic diagram of the structure of the utility model (without the spring);

[0025] Figure 6 It is a structural schematic diagram of the locking column in the utility model;

[0026] Figure 7 It is a structural schematic diagram of the clamp body in the utility model;

[0027] Figure 8This is a schematic diagram of the structure of the clamping block (the block fixed to the slide rail) in the utility model;

[0028] Fig. 9 It is a structural schematic diagram of the motion arm in the utility model;

[0029] Fig.10 This is a schematic diagram of the structure of the medium and long pin of the utility model;

[0030] In the figure: locking column 1, fixing hole 1-1, external thread 1-2, fixing hole 1-3, auxiliary locking knob 2, clamp body 3, limiting groove 3-1, first connecting ear 3-2, second connecting ear 3-3, cylindrical cavity 3-4, fixing hole 3-5, slide rail 4, clamp block 5, slide rail groove 5-1, bolt hole 5-2, bolt 5-3, moving arm 6, limiting pin 6-1, long pin 6-2, slot 6-2-1, first straight arm 6-3, first right-angle arm 6-4, pressing handle 6-5, second right-angle arm 6-6, spring 6-7, second straight arm 6-8, short pin 6-9, clamp body 7, movable clamp block 8, fixed clamp block 9, manual knob 10, fixing seat 11. DETAILED DESCRIPTION

[0031] like Figure 2-3 As shown, a clamp device for material tensile testing includes a locking column 1, a clamp body 3, a moving arm 6, and a pair of clamp blocks 5. Specifically:

[0032] 1. The top end of the locking column 1 is used to connect with the fixing seat 11 of the tension equipment, and the bottom end of the locking column 1 is connected with the top end of the clamp body 3. A vertically arranged limiting groove 3-1 is provided in the middle of the bottom end of the clamp body 3.

[0033] 2. Sports arm, such as Fig. 9 As shown, it includes: a first right-angle arm 6-4, a first straight arm 6-3, a second right-angle arm 6-6, and a second straight arm 6-8; the first right-angle arm 6-4 and the second right-angle arm 6-6 are cross-arranged and hinged through a limit pin 6-1, and the limit pin is slidably assembled in the limit groove 3-1; the top ends of the first straight arm 6-3 and the second straight arm 6-8 are respectively hinged to the two sides of the clamp body through a short pin 6-9, and the bottom ends of the first straight arm and the second straight arm are respectively hinged to the top ends of the first right-angle arm 6-4 and the second right-angle arm 6-6 through a long pin 6-2; a pressing handle 6-5 is provided at the bottom end of the second right-angle arm 6-6; a pair of springs 6-7 are arranged in parallel, and two long pins are connected to the two ends of each spring.

[0034] In one embodiment of the present invention: Figure 7As shown, a pair of first connecting ears 3-2 are provided on the left side of the clamp body 3, and a second connecting ear 3-3 is provided on the right side. The pair of first connecting ears 3-2 jointly clamp the top end of the hinged first straight arm 6-3, and a pair of second straight arms 6-8 clamp the hinged second connecting ears 3-3; the first right-angle arms 6-4 are arranged in pairs and jointly clamp the bottom end of the hinged first straight arm 6-3.

[0035] In one embodiment of the present invention: Fig.10 As shown, the outer side wall of the long pin 6-2 is provided with a slot 6-2-1 matching the end of the spring.

[0036] 3. A pair of clamping blocks 5 are arranged opposite to each other and are respectively connected to the other ends of the first and second right-angle arms; the pair of clamping blocks are separated by lifting and pressing the handle to overcome the spring force.

[0037] In one embodiment of the present invention: Figure 4 As shown, the tensioning device is provided with a fixing seat 11, and the fixing seat has a cylindrical cavity with a size matching the top end of the locking column, and a fixing hole is provided on the side wall of the cylindrical cavity; a fixing hole 1-1 is provided on the upper part of the locking column, and the top end of the locking column is installed in the cylindrical cavity of the tensioning device fixing seat, and the two are fixed by passing a pin through the fixing holes of the two.

[0038] In one embodiment of the present invention: Figure 3 , 6 As shown, the lower part of the locking column 1 is provided with fixing holes 1-3, such as Figure 7 As shown, the top end face of the clamp body 3 is provided with a cylindrical cavity 3-4 (matching the size of the bottom end of the locking column), and the side wall of the cylindrical cavity is provided with a fixing hole 3-5; the bottom end of the locking column is installed in the cylindrical cavity at the top end of the clamp body, and the two are fixed by passing a pin through the fixing holes of the two.

[0039] In one embodiment of the present invention: Figure 6 As shown, the outer wall of the locking column 1 is provided with an external thread 1-2, and the outer sleeve of the locking column is provided with an auxiliary locking knob 2, which is screwed with the locking column thread; lock the auxiliary locking knob and press it against the end face of the clamp body. At this time, the fixing hole of the clamp body, the fixing hole of the locking column, and the pin are tightly matched to lock the locking column and the clamp body.

[0040] In one embodiment of the present invention: Figure 5 As shown, the clamp also includes a slide rail 4, and a horizontally arranged slide rail groove 5-1 is provided on the same side of a pair of clamping blocks 5. The two slide rail grooves are connected, and the slide rail 4 is placed in the two slide rail grooves. One of the slide rail grooves is provided with a bolt hole 5-2. The slide rail is fixedly connected to the slide rail groove with the bolt hole by a bolt 5-3 to ensure that the two clamping blocks always move in the same horizontal line.

[0041] In one embodiment of the present invention: Figure 8 As shown, a pair of clamping blocks 5 are made of hard rubber material, and the contact surfaces of the clamping blocks are provided with uniform friction textures.

Claims

1. A clamp device for material tensile testing, characterized in that: include: A locking column, one end of which is used to connect with the tensioning device; A clamp body, one end of which is connected to the other end of the locking column and the other end of which is provided with a vertically arranged limiting groove; The moving arm comprises a first right-angle arm, a first straight arm, a second right-angle arm and a second straight arm; the first and second right-angle arms are cross-arranged and hinged by a limit pin, and the limit pin is slidably assembled in a limit groove; one end of the first and second straight arms are respectively hinged to two sides of the clamp body by a short pin, and the other end of the first and second straight arms are respectively hinged to one end of the first and second right-angle arms by a long pin; a pressing handle is provided at the other end of the first or second right-angle arm; A pair of springs, arranged in parallel, with two long pins connected to each end of the spring; A pair of clamping blocks are arranged opposite to each other and are respectively connected to the other ends of the first and second right-angle arms; the pair of clamping blocks are separated by lifting and pressing the handle to overcome the spring force.

2. A clamp device for material tensile testing according to claim 1, characterized in that: The tensioning device is provided with a fixing seat, and the fixing seat has a cylindrical cavity, and a fixing hole is provided on the side wall of the cylindrical cavity; one end of the locking column is provided with a fixing hole, and one end of the locking column is installed in the cylindrical cavity of the tensioning device fixing seat, and is fixed by a pin passing through the fixing holes of the two.

3. A clamp device for material tensile testing according to claim 1, characterized in that: The other end of the locking column is provided with a fixing hole, the end face of the clamp body is provided with a cylindrical cavity, and the side wall of the cylindrical cavity is provided with a fixing hole; the other end of the locking column is installed in the cylindrical cavity of the clamp body and is fixed by a pin passing through the fixing holes of the two.

4. A clamp device for material tensile testing according to claim 3, characterized in that: It also includes an auxiliary locking knob, which is sleeved outside the locking column and is threadedly screwed with the outer wall of the locking column; the auxiliary locking knob abuts against the end face of the clamp body to lock the locking column and the clamp body.

5. A clamp device for material tensile testing according to claim 1, 2, 3 or 4, characterized in that: It also includes a slide rail, and a pair of clamping blocks are respectively provided with a horizontally arranged slide rail groove on the same side, and the two slide rail grooves are connected; the slide rail is placed in the two slide rail grooves and is fixedly connected to one of the slide rail grooves by bolts.

6. A clamp device for material tensile testing according to claim 1, characterized in that: The outer side wall of the long pin is provided with a clamping groove matching the end of the spring.

7. A clamp device for material tensile testing according to claim 1, characterized in that: A pair of first connecting ears is provided on one side of the clamp body, and a second connecting ear is provided on the other side. The pair of first connecting ears jointly clamp one end of the hinged first straight arm. The second straight arms are arranged in pairs, and a pair of second straight arms clamp the hinged second connecting ears; the first right-angle arms are arranged in pairs and jointly clamp the other end of the hinged first straight arm.

8. The clamp device for material tensile testing according to claim 1, characterized in that: A pair of clamping blocks are made of hard rubber, and the contact surfaces are respectively provided with friction textures.