CN217359339U

CN217359339U - Separated Hopkinson pull rod plate-shaped sample clamp

Info

Publication number: CN217359339U
Application number: CN202221210202.5U
Authority: CN
Inventors: 王彦莉; 万明明; 厉雪; 孙颜涛; 梁家毅; 白嵘; 李树涛; 田时雨
Original assignee: Inner Mongolia Metal Material Research Institute
Current assignee: Inner Mongolia Metal Material Research Institute
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-09-02
Anticipated expiration: 2032-05-18

Abstract

The utility model relates to a disconnect-type hopkinson pull rod plate-like sample anchor clamps belongs to the experimental technical field of material impact dynamics, and it includes coaxial and the relative pull rod body that sets up, a serial communication port, the draw-in groove has been seted up to the one end of pull rod body, the draw-in groove transversely runs through the both sides of pull rod body, be equipped with spacing hole on the pull rod body, spacing hole vertically runs through the pull rod body, be equipped with on the spacing hole and press from both sides tight locating part, press from both sides tight locating part and provide and press from both sides tight limiting displacement to the sample in the draw-in groove. The utility model provides a realize the zero clearance fit of sample and pull rod, the dress card is fast, and test data does not have the wave form and vibrates, and the precision is high, simple structure, and sample workable is easily connected.

Description

Separated Hopkinson pull rod plate-shaped sample clamp

Technical Field

The utility model relates to a disconnect-type hopkinson pull rod plate-like sample anchor clamps belongs to the experimental technical field of material impact dynamics.

Background

In recent years, the mechanical properties of materials in extreme environments such as high temperature, high pressure and high strain rate are concerned, and the separated Hopkinson pull rod is a key experimental device for researching the tensile mechanical properties of the materials under the loading of high strain rate, and is widely applied to the field of testing the dynamic properties of the materials.

When a dynamic tensile test of a material is carried out, the connection mode of the sample and the Hopkinson bar seriously influences the convenience of test operation and the accuracy of a test result. At present, the sample is connected with the Hopkinson pull rod by adopting a direct connection mode such as adhesive connection, threaded connection and T-shaped clamping groove connection, or by using a clamp connector for auxiliary connection. The method has the advantages that the sample and the pull rod are directly bonded and fixed by glue in the gluing connection mode, the requirement for the adhesive force of the glue is high, the sample slipping phenomenon is prone to occurring, long time is needed for cementing, fixing and melting, the test period is long, and the working efficiency is low. The screw connection method is a commonly used connection method, in which a sample is made into a dumbbell-shaped rotary body, external threads are processed at two ends of the sample, and the sample is connected with a pull rod through screw threads. The threaded connection is relatively tight, and can effectively avoid the problem of sample slippage, but the threaded connection is only suitable for materials which can be processed into dumbbell-shaped samples and can process threads, and is not suitable for thin plate-shaped materials and soft materials which can not process threads. In addition, due to the fact that the tool withdrawal grooves are reserved at the bottoms of the threaded holes of the incident rod and the transmission rod end, gaps are still reserved inside the sample and the rod after the sample and the rod are connected, and repeated experiments prove that the gaps can cause severe vibration of the waveform head, and the test effect is influenced. The T-shaped clamping groove connection is characterized in that clamping grooves for clamping a sample are formed in clamping ends of the incident rod and the transmission rod of the pull rod, and after the sample is clamped into the clamping grooves in a test, a wedge-shaped block is required to completely fill the clearance between two ends of the sample and the clamping grooves. The sample clamping mode is suitable for materials which are easy to process into plates, has the advantages of stronger universality and the defects that gaps always remain between wedge-shaped blocks of the clamping groove accessories and the pull rod after the wedge-shaped blocks are installed, and the gaps need to be fixed by glue to avoid the slippage of the sample, thereby influencing the test efficiency. The connection method of the sample and the pull rod has advantages and disadvantages, is applied at present, and can be changed according to specific conditions in practical application, for example, the Chinese utility model with the patent number of CN203479614U discloses a split Hopkinson pull rod test piece fixture device, and a plurality of sets of threaded incident rod and transmission rod fixture joints are adopted, so that the test piece and the pull rod can be processed, and the replacement is convenient; chinese patent No. CN111426555B discloses a tensile fixture for a split hopkinson pull rod thin sheet test piece and an experimental method, wherein the fixture comprises a main fixture body and an auxiliary fixture body, the fixture body is connected with a pull rod in a threaded manner, although the two methods effectively solve the problem of slipping of the thin sheet test piece in the experimental process, the defects caused by threaded connection are still not solved. Chinese utility model patent with patent number CN 204679341U discloses a dynamic tensile test anchor clamps, including the main clamp specifically, clamping piece and thread tightening anchor clamps, wherein, the main specific one end trompil that presss from both sides, the downthehole wall is by outer internal thread and the interior conical surface of having set gradually in to, thread tightening anchor clamps's one end periphery is provided with the external screw thread that presss from both sides specific internal thread matched with the main. The complex connection mode relates to a conical surface with higher processing requirement, more gaps still exist in the main clamp body, the clamping piece and the thread fixing clamp which are required after the assembly is completed, the clamps are not matched and fastened, stress wave propagation can be interfered, and the test effect is influenced.

Therefore, a separate hopkinson pull rod plate-shaped sample clamp is needed to solve the problems of waveform oscillation and difficult clamping caused by a threaded connection mode and an adhesive connection mode.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to the above-mentioned problem of prior art, provide a disconnect-type hopkinson pull rod plate-like sample anchor clamps.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a disconnect-type hopkinson pull rod plate-shaped sample anchor clamps, includes coaxial and relative pull rod body that sets up, its characterized in that, the draw-in groove has been seted up to the one end of pull rod body, the draw-in groove transversely runs through the both sides of pull rod body, be equipped with spacing hole on the pull rod body, spacing hole vertically runs through the pull rod body, be equipped with on the spacing hole and press from both sides tight locating part, press from both sides tight locating part and provide the tight limiting displacement of clamp to the sample in the draw-in groove.

On the basis of the technical scheme, the utility model discloses can also make following improvement:

further, the clamping limiting part is a screw and a nut which are in threaded fit. Pass spacing hole through the screw to with nut fixed clamp sample, simple structure need not to use the glue bonding, and the dress card is fast, has greatly improved test efficiency.

Furthermore, a through groove is formed in the pull rod body, the through groove transversely penetrates through two sides of the pull rod body, and the clamping groove is communicated with the through groove. The draw-in groove is linked together with leading to the groove, and when screw nut cooperation pressed from both sides tight sample, it provides the surplus that can deform for the pull rod body to lead to the groove, makes the draw-in groove laminate the sample more, presss from both sides tight sample, guarantees no clearance between sample and pull rod, and then the tensile force that the sample received when making the test is more steady, and the wave form does not receive clearance interference.

Furthermore, the through groove is C-shaped or U-shaped, so that the sample can be conveniently fastened through screws and nuts, the sample is completely closed after the sample is assembled, and seamless connection between the sample and the clamping groove is ensured.

Furthermore, two limiting holes are arranged in parallel. The number of the limiting holes is small, and the screw and the nut are easy to install.

Furthermore, be equipped with the sawtooth on the draw-in groove internal surface to increase the connection frictional force between sample and the pull rod, better prevent the test sample slippage in the test process.

The utility model provides a pair of disconnect-type hopkinson pull rod plate-like sample anchor clamps's advantage lies in:

(1) the clamping groove is directly formed at the end, clamped by the pull rod body, of the sample, and the clamping limiting piece is fastened, so that the sample and the pull rod are in gapless fit, the bonding by glue is not needed, the clamping speed is high, and the test efficiency is greatly improved; the sample is stressed stably, test data has no waveform oscillation, and the precision is high.

(2) The draw-in groove is for running through the logical groove of pull rod body, simple structure, and the sample workable is easily connected.

(3) The two pull rod bodies are arranged oppositely and coaxially, and when the test is carried out, the two pull rod bodies are collinear and reverse to the tensile force of the test sample, so that the torsion generated by the stress deviation of the test sample is avoided, and the accuracy of the test result is ensured.

Drawings

Fig. 1 is a top view of a split hopkinson pull rod plate-shaped sample clamp of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic structural diagram of the sample of the present invention.

The reference numbers are recorded as follows: 1. an incident rod; 2. a transmission rod; 3. a card slot; 4. saw teeth; 5. a limiting hole; 6. a through groove; 7. a sample; 8. and a through hole.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

The present invention relates to a horizontal and vertical direction, which is not limited to the orientation shown in the cross-sectional view of the fixture of fig. 2.

As shown in fig. 1-2, a plate-shaped sample clamp of disconnect-type hopkinson pull rod, including two coaxial and relative pull rod bodies that set up, two pull rod bodies are incident pole 1 and transmission pole 2 respectively, draw-in groove 3 has been seted up to the one end of pull rod body, the other end and the equipment of pull rod body are connected, draw-in groove 3 is used for centre gripping sample 7, draw-in groove 3 transversely runs through the both sides of pull rod body, and easy to assemble sample 7, be equipped with sawtooth 4 on the 3 internal surfaces of draw-in groove to increase the connecting friction between sample 7 and the pull rod, the better slippage of sample 7 in the prevention test process.

The pull rod is characterized in that two limiting holes 5 are formed in the pull rod body in parallel, the limiting holes 5 longitudinally penetrate through the pull rod body, clamping limiting parts are arranged on the limiting holes 5 and are screws and nuts (not shown in the drawing) in threaded fit, referring to fig. 3, through holes 8 are formed in the positions, corresponding to the limiting holes 5, of two ends of a sample 7, the screws penetrate through the limiting holes 5 and the through holes 8 to be matched with the nuts, and the screws and the nuts are matched to provide clamping limiting effects for the sample 7 in the clamping grooves 3.

The pull rod body is provided with a through groove 6, the through groove 6 transversely penetrates through two sides of the pull rod body, and the clamping groove 3 is communicated with the through groove 6. The through groove 6 is C-shaped or U-shaped.

The utility model discloses a 7 dress card methods of plate-like sample, its dress card process step includes:

step (1), preparation before clamping: adjusting the incident rod 1 and the transmission rod 2 to coaxial relative positions, wherein the clamping groove 3 on the incident rod 1 is parallel to the clamping groove 3 on the transmission rod 2;

step (2), clamping the sample 7: clamping one end of a sample 7 into the clamping groove 3 of the incident rod 1, and clamping the other end of the sample 7 into the clamping groove 3 of the transmission rod 2;

step (3), installing screws: screws are respectively arranged in the two limiting holes 5 of the incident rod 1 and the transmission rod, and the other ends of the screws are fastened by nuts;

and (4) fixing the incident rod 1 and the transmission rod 2 to finish clamping the sample 7.

Furthermore, after the card is installed, the incident rod 1, the sample 7 and the transmission rod 2 are located on the same horizontal axis, so that the tension applied to the sample 7 in the test is opposite and collinear, and the accuracy and precision of test data are improved.

Furthermore, after the clamping is finished, the sample 7 is in clearance-free fit with the clamping groove 3, and the data accuracy is prevented from being influenced by the slippage, the play and the clearance of the sample 7 during the test.

Further, the sample 7 is prepared into an I shape, and the clamping end of the sample 7 is consistent with the size of the clamping groove 3 so as to realize tight connection with the clamping groove 3.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a disconnect-type hopkinson pull rod plate-like sample anchor clamps, its characterized in that, including coaxial and relative pull rod body that sets up, the draw-in groove has been seted up to the one end of pull rod body, the draw-in groove transversely runs through the both sides of pull rod body, be equipped with spacing hole on the pull rod body, spacing hole vertically runs through the pull rod body, be equipped with on the spacing hole and press from both sides tight locating part, press from both sides tight locating part and provide the tight limiting displacement of clamp to the sample in the draw-in groove.

2. The split hopkinson pull rod plate specimen holder of claim 1, wherein the clamping stop is a screw and nut that are threaded.

3. The split hopkinson pull rod plate-shaped sample clamp as claimed in claim 2, wherein a through groove is formed in the pull rod body, the through groove transversely penetrates through two sides of the pull rod body, and the clamping groove is communicated with the through groove.

4. The split hopkinson pull rod plate specimen holder of claim 3 wherein the through slot is C-shaped or U-shaped.

5. The split hopkinson pull rod plate-shaped sample clamp according to claim 2, wherein two limiting holes are provided in parallel.

6. The split hopkinson pull rod plate specimen holder of claim 1, wherein serrations are provided on an inner surface of the clamping groove.