Wide chuck for large-deformation extensometer

Abstract

The wide chuck for the large-deformation extensometer comprises a sliding rod, a first clamping rod and a second clamping rod which are located in the same plane with a main body clamp, one end of the sliding rod is perpendicularly connected to the middle of the first clamping rod, the two clamping rods are right opposite to each other and are arranged in parallel, and guide through holes are formed in the two ends of the first clamping rod respectively. Pull rods are arranged in the guide through holes in the two ends in a sliding mode, the ends, penetrating through the first clamping rod, of the pull rods are perpendicularly connected to the second clamping rod, the other ends, penetrating through the first clamping rod, of the pull rods are provided with threaded parts, the threaded parts are in threaded connection with adjusting nuts, and the pull rods are sleeved with reset springs between the adjusting nuts and the first clamping rod. Threaded through holes are further formed in the two ends of the second clamping rod respectively, adjusting screws are connected into the threaded through holes in a threaded mode, and the adjusting screws penetrate through one end of the second clamping rod to abut against the first clamping rod. The large-width sample clamping device can meet clamping measurement of a large-width sample, is good in stability and can meet the requirement for accurate measurement of the large-width sample.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring equipment clamps, in particular to a wide clamp for a large deformation extensometer. Background Art

[0002] Existing large-deformation extensometer fixtures suffer from poor accuracy and stability when measuring large deformations, and a limited measurement range. This is particularly true when measuring wide specimens. Existing extensometer chucks are unstable, making stable measurements difficult to achieve, making it difficult to meet the demand for accurate measurements. Therefore, developing a high-stability, wide-type chuck for large-deformation extensometers has important practical applications. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a wide chuck for a large deformation extensometer, which can meet the needs of clamping and measuring large-width specimens, has good stability, and can meet the needs of accurate measurement of large-width specimens.

[0004] The utility model is achieved through the following technical solutions:

[0005] A wide chuck for a large deformation extensometer is provided, which can be adjustably installed on a main body clamp and includes a sliding rod, a first clamping rod and a second clamping rod located in the same plane as the main body clamp. The end of the sliding rod away from the main body clamp is vertically connected to the middle part of the first clamping rod, and the second clamping rod is arranged opposite and parallel to the first clamping rod. Guide holes are respectively provided at both ends of the first clamping rod, and pull rods are slidably arranged in the guide holes at both ends and vertically penetrate the first clamping rod. One end of the pull rod penetrates the first clamping rod and is vertically connected to the second clamping rod. The other end of the pull rod penetrates the first clamping rod and is provided with a threaded portion, and an adjusting nut is threadedly connected to the threaded portion. A reset spring is sleeved on the pull rod between the adjusting nut and the first clamping rod; threaded holes are also respectively provided at both ends of the second clamping rod, and an adjusting screw is threadedly connected in the threaded hole. The adjusting screw penetrates one end of the second clamping rod and abuts against the first clamping rod.

[0006] Furthermore, a sawtooth-shaped first clamping portion is provided in the middle of a surface of the first clamping rod facing the second clamping rod, and a planar second clamping portion facing the first clamping portion is provided in the middle of a surface of the second clamping rod facing the first clamping rod.

[0007] The serrated first clamping portion on the first clamping rod and the planar second clamping portion on the second clamping rod can cooperate with each other to clamp and fix the sample, thereby improving the stability of the sample clamping.

[0008] Preferably, a weight-reducing hole is respectively provided on the first clamping rod and the second clamping rod.

[0009] By opening weight-reducing holes on the two clamping rods, not only the rigidity of the clamping rods is maintained, but also the overall weight is reduced, effectively reducing costs.

[0010] Furthermore, screw holes are respectively provided at both ends of the second clamping rod facing the pull rod, and the pull rod is connected to the second clamping rod by screws in the screw holes.

[0011] The two ends of the second clamping rod are connected and fixed with the pull rod by screw holes and screws to ensure the stability of the pull rod.

[0012] Furthermore, a strip-shaped through slot is provided on the slide rod along its length, and two threaded holes are provided on the main body fixture opposite to the strip-shaped through slot. The main body fixture and the slide rod are detachably connected by fixing screws.

[0013] The strip-shaped through slot on the slide bar can be used with the threaded hole on the main fixture to cooperate with the fixing screw to adjust the front and back position, so that the best test position can be adjusted at any time according to the different test samples.

[0014] Beneficial effects of the utility model:

[0015] The utility model adopts a long rod-shaped first clamping rod and a second clamping rod to cooperate with each other for clamping. The widened rod body can meet the needs of larger specimens to a greater extent. The two pull rods arranged at both ends cooperate with the reset spring to clamp the specimen, which can ensure repeated positioning and stable advance and retreat during repeated clamping; when the adjusting bolt is rotated, it can be used to adjust the tightness of the clamping mouth, realize adjustable clamping force, improve the stability of clamping and ensure the measurement accuracy of the extensometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall installation structure of the utility model.

[0017] Figure 2 for Figure 1 Top view of .

[0018] As shown in the figure:

[0019] 1. Large deformation extensometer, 2. Wide chuck, 3. Threaded hole, 4. Main clamp, 5. Slide rod, 6. First clamping rod, 7. Second clamping rod, 8. First clamping part, 9. Second clamping part, 10. Pull rod, 11. Adjusting nut, 1 2、 Adjusting bolt, 13, return spring, 14, strip groove, 15, weight reduction hole, 16, threaded part, 17, screw. DETAILED DESCRIPTION

[0020] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0021] A wide chuck for a large deformation extensometer can be adjustably mounted on a main fixture 4. A strip-shaped through-slot 14 is provided on a slide rod 5 along its length. Two threaded holes 3 are provided on the main fixture 4 opposite the strip-shaped through-slot 14. The main fixture 4 and the slide rod 5 are detachably connected by fixing screws. The overall position of the chuck can be adjusted forward and backward according to the sample type to improve measurement accuracy.

[0022] The wide chuck includes a slide rod 5 , a first clamping rod 6 and a second clamping rod 7 located in the same plane as the main clamp 4 , wherein the first clamping rod 6 and the second clamping rod 7 are respectively provided with a plurality of weight-reducing holes 15 .

[0023] The end of the sliding rod 5 away from the main body clamp 4 is vertically connected to the middle part of the first clamping rod 6, and the second clamping rod 7 is arranged opposite and parallel to the first clamping rod 6. Guide holes are respectively opened at both ends of the first clamping rod 6, and a pull rod 10 is slidably arranged in the guide holes at both ends, which passes through the first clamping rod 6 vertically. The pull rod 10 passes through one end of the first clamping rod 6 and is vertically connected to the second clamping rod 7. The other end of the pull rod 10 passes through the first clamping rod 6 and is provided with a threaded portion 16, and an adjusting nut 11 is threadedly connected to the threaded portion 16. A reset spring 13 is sleeved between the adjusting nut 11 and the first clamping rod 6; threaded holes are also opened at both ends of the second clamping rod 7, and an adjusting screw 12 is threadedly connected in the threaded hole. The adjusting screw 12 passes through one end of the second clamping rod 7 and abuts against the first clamping rod 6.

[0024] A sawtooth-shaped first clamping portion 8 is provided in the middle of a surface of the first clamping rod 6 facing the second clamping rod 7 , and a planar second clamping portion 9 facing the first clamping portion 8 is provided in the middle of a surface of the second clamping rod 7 facing the first clamping rod 6 .

[0025] Screw holes are respectively provided at both ends of the second clamping rod 7 facing the pull rod 10 , and the pull rod 10 is connected to the second clamping rod 7 via screws 17 in the screw holes.

[0026] The working process of this utility model:

[0027] First, the wide chuck is moved back and forth as a whole to the optimal test position through the strip groove 14 between the main clamp 4 and the slide rod 5 in conjunction with the fixing screws and the holes. The adjustment nut 11 is rotated forward and backward to compress and restore the reset spring 13 to adjust the tightness of the clamp to an appropriate degree.

[0028] Rotating the adjusting bolt 12 on the first clamping rod 6 clockwise can push the reaction force of the second clamping rod 7 and the first clamping rod 6. The first clamping rod 6 will pull the slide rod 5 due to the reaction force. The movement of the slide rod 5 drives the adjusting nut 11 to compress the reset spring 13, causing the distance between the serrated first clamping part 8 and the flat second clamping part to increase, so that the sample can be placed.

[0029] After the sample is placed, the adjusting bolt 11 is rotated counterclockwise, and the second clamping rod 7 is pushed back to its original position by the elastic force of the return spring 13, so that the distance between the first clamping part 8 and the second clamping part 9 is reduced until they overlap and bear the force.

[0030] The clamping force of the two clamping parts on the sample depends entirely on the thrust generated by the compression of the return spring 13 by the adjusting nut 11. The clamping force can be adjusted by rotating the adjusting nut 11.

[0031] After the specimen is clamped, the large deformation extensometer 1 is operated, and the wide chuck of the large deformation extensometer 1 is controlled to move up and down to achieve the detection effect.

[0032] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A wide chuck for a large deformation extensometer, adjustable and mounted on a main fixture, characterized by: The cam is connected to the first clamping rod and the second clamping rod is connected to the first clamping rod by a threaded portion, and the cam is connected to the first clamping rod by a threaded portion.

2. The wide chuck for large deformation extensometer according to claim 1, characterized in that: A sawtooth-shaped first clamping portion is provided in the middle of a surface of the first clamping rod facing the second clamping rod, and a planar second clamping portion is provided in the middle of a surface of the second clamping rod facing the first clamping rod.

3. The wide chuck for large deformation extensometer according to claim 1, characterized in that: The first clamping rod and the second clamping rod are respectively provided with weight-reducing holes.

4. The wide chuck for a large deformation extensometer according to claim 1, characterized in that: Screw holes are respectively provided at both ends of the second clamping rod facing the pull rod, and the pull rod is connected to the second clamping rod through screws in the screw holes.

5. The wide chuck for large deformation extensometer according to claim 1, characterized in that: A strip-shaped through slot is provided on the slide bar along its length, and two threaded holes are provided on the main body fixture opposite to the strip-shaped through slot. The main body fixture and the slide bar are detachably connected by fixing screws.

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