CN215004675U - Silicon core pipe tensile test anchor clamps - Google Patents
Silicon core pipe tensile test anchor clamps Download PDFInfo
- Publication number
- CN215004675U CN215004675U CN202120705996.1U CN202120705996U CN215004675U CN 215004675 U CN215004675 U CN 215004675U CN 202120705996 U CN202120705996 U CN 202120705996U CN 215004675 U CN215004675 U CN 215004675U
- Authority
- CN
- China
- Prior art keywords
- silicon core
- pull rod
- core pipe
- tensile test
- core tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000009864 tensile test Methods 0.000 title claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model relates to a silicon core pipe tensile test field discloses a silicon core pipe tensile test anchor clamps. The clamp comprises a pull rod and a clamping sleeve, the upper part of the pull rod is provided with an installation structure, and the clamping sleeve is a hollow pipe. The middle part of the pull rod is provided with a step, and the lower part of the pull rod is provided with an external thread; the upper part of the cutting sleeve is provided with a stepped hole, and the lower part of the cutting sleeve is provided with an internal thread; the pull rod is placed in the clamping sleeve; the diameters of the step and the upper part of the stepped hole are smaller than the diameter of the lower part of the stepped hole, and the step is embedded in the stepped hole; the space between the external thread and the internal thread forms a clamping area of the clamp. The inner support and the outer clamp and the two sides of the inner wall and the outer wall of the silicon core pipe are clamped by the pull rod and the clamping sleeve, so that the uniform stress of the silicon core pipe in the circumferential direction is ensured, and the stable and reliable clamping of the silicon core pipe in the axial stretching is realized.
Description
Technical Field
The utility model relates to a silicon core pipe tensile test field, more specifically relates to a silicon core pipe tensile test anchor clamps.
Background
The silicon core pipe is a high-density polyethylene silicon composite pipeline with the inner wall provided with the colloidal silica solid lubricant, has good sealing performance, chemical corrosion resistance and low engineering cost, and is widely applied to optical cable communication network systems of highways, railways and the like. The performance indexes of the silicon core tube, such as tensile strength, longitudinal shrinkage and the like, need to be obtained through a tensile test. The tensile test is a test method for measuring the material characteristics under the axial tensile load, and is a common test method. During the tensile test, the two ends of the silicon core tube sample are clamped and fixed on a tensile testing machine (a universal machine) through a special clamp. In the prior art, special clamps are generally wedge-shaped clamps and threaded connection type clamps.
The wedge-shaped clamp clamps the two ends of the silicon core pipe sample after being flattened, so that the specification of the sample is not limited, and the installation and the disassembly are simple and efficient. However, the silicon core tube sample can achieve an ideal flattening effect only through a plurality of process flows, and the test preparation work is complicated. In addition, because the two ends of the silicon core tube sample are greatly deformed, the sample is easily broken at the clamping edges of the two ends during the test, so that the test is invalid. Repeated tests result in low test efficiency and large consumption of silicon core tube samples.
The screw thread connection type clamp is directly screwed into the inside of a silicon core pipe sample to realize clamping through a screw rod with external threads, different sample specifications need to be prepared into screw rods with different diameters, and the installation process is simple and efficient. However, the threaded connection of the shallow thread teeth cannot provide enough clamping force, so that the clamp falls off in the test process, and the test fails. The threaded connection of the deep thread can damage the inner walls of the connecting parts at the two ends of the sample, so that the wall thickness of the connecting parts is thinned, the connecting parts at the two ends of the sample are broken in the test process, and the test fails.
Patent CN 111351709A-silicon core pipe whole tensile properties detects uses auxiliary device and detection method, specifically discloses: "will wait to detect the both ends of silicon core pipe and overlap respectively on the body of rod including, with the outside of body of rod and silicon core pipe sample including first casing and second casing lock, connect … …" this utility model's auxiliary device between first casing and second casing respectively with the bolt, through the mode of interior body coupling silicon core inside pipe wall and two casing clamp tight silicon core outside of tubes wall, realize the centre gripping to the silicon core pipe. The two shells increase the pressure between the inner rod body and the inner wall of the silicon core tube by clamping the outer wall of the silicon core tube, so that the axial tension transmitted by the clamp is increased. However, the two shells cannot generate axial tension on the outer wall of the silicon core pipe and transmit the axial tension to the inner rod body. To the great silicon core pipe of tensile strength, use this utility model's auxiliary device to test, still can have anchor clamps to drop, problem of experimental failure.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming above-mentioned prior art's defect, provide a silicon core pipe tensile test anchor clamps, through pull rod and cutting ferrule to the internal stay of silicon core intraductal outer wall press from both sides and two-sided centre gripping, guaranteed the even atress of silicon core pipe on the circumferencial direction, realized the reliable and stable centre gripping of silicon core pipe when axial tension.
The utility model provides a technical scheme be, a silicon core pipe tensile test anchor clamps, including pull rod and cutting ferrule, the upper portion of pull rod is provided with mounting structure, and the cutting ferrule is the hollow tube. The middle part of the pull rod is provided with a step, and the lower part of the pull rod is provided with an external thread; the upper part of the cutting sleeve is provided with a stepped hole, and the lower part of the cutting sleeve is provided with an internal thread; the pull rod is placed in the clamping sleeve; the diameters of the step and the upper part of the stepped hole are smaller than the diameter of the lower part of the stepped hole, and the step is embedded in the stepped hole; the space between the external thread and the internal thread forms a clamping area of the clamp.
According to silicon core pipes with different diameters, the external threads at the lower part of the pull rod and the internal threads at the lower part of the clamping sleeve are correspondingly adjusted in diameter and matched with the external threads. The clamps are used in pairs, and the specific use mode is as follows: taking the process of clamping one end of the silicon core pipe as an example, the pull rod is firstly screwed into one end of the silicon core pipe until the lower side surface of the step is superposed with the side surface of the silicon core pipe; then the cutting sleeve is sleeved into one end of the silicon core tube in a rotating mode until the lower side face of the stepped hole is overlapped with the upper side face of the step; then, clamping the other end of the silicon core pipe is completed in the same way; and finally, connecting the mounting structure on the pull rod with a joint of a universal machine to complete the clamping of the silicon core pipe and start the tensile test of the silicon core pipe. The axial position positioning among the pull rod, the clamping sleeve and the silicon core tube is completed through the step and the side surface of the stepped hole. Through the cooperation of step and shoulder hole, accomplished the axial pulling force transmission of cutting ferrule to pull rod. The inner support and the outer clamp and the two sides of the inner wall and the outer wall of the silicon core pipe are clamped by the pull rod and the clamping sleeve, so that the uniform stress of the silicon core pipe in the circumferential direction is ensured, and the stable and reliable clamping of the silicon core pipe in the axial stretching is realized.
Preferably, the tooth-shaped height of the external thread and the internal thread is 0.2-1.0mm according to the change of the diameter of the silicon core pipe from small to large. The tooth profile height is lower than that of the existing standard thread, the roughness of the outer surface of the pull rod and the inner surface of the cutting sleeve is increased under the condition that the wall of the silicon core pipe is not damaged as far as possible, better twisting connection with the silicon core pipe is realized, further the axial tension transmitted by the clamp is increased, and meanwhile, the installation is facilitated.
Preferably, for a silicon core pipe diameter specification, the diameter of the external thread is 0-2mm larger than the internal diameter of the silicon core pipe, and the diameter of the internal thread is 0-2mm smaller than the external diameter of the silicon core pipe. Through the slight difference setting of diameter between external screw thread, silicon core pipe and the internal thread, enable the silicon core pipe after the clamping, produce a small amount of plastic deformation, increase area of contact, and then increased the axial pulling force of anchor clamps transmission.
Preferably, the length of the internal thread is 0-5mm longer than that of the external thread, so that the clamping sleeve can completely wrap the connecting area of the pull rod and the silicon core pipe, and the internal-support external clamp of the connecting area of the silicon core pipe is further realized.
Preferably, the cutting sleeve is two semicircular hollow pipes with ear edges, and the two semicircular hollow pipes are connected through fasteners on the ear edges. When the tooth shape height and the diameter of the internal thread are larger, the internal thread is sleeved on the outer wall of the silicon core tube in a rotating mode, so that the installation resistance is large, and the installation is difficult. The cutting ferrule is divided into two parts, the installation mode is changed from rotating and sleeving into encircling and clamping, and the cutting ferrule is convenient to install and connect with the outer wall of the silicon core tube. Meanwhile, the deformation amount of the silicon core pipe can be easily adjusted by adjusting the pretightening force of the fastening piece, and further the axial tension transmitted by the clamp is adjusted. In addition, the fastener sets up respectively at the ear limit, easy to assemble.
Preferably, the pull rod further comprises a nut, and an external thread matched with the nut is arranged between the mounting structure of the pull rod and the step. When the clamp is connected with a joint of a universal machine through a mounting structure on the pull rod, the whole clamp cannot be completely fixed in the axial direction. Therefore, nuts are respectively added at two ends of the clamp, the clamp and the connector are tightly connected through the nuts and the external threads on the pull rod, and the phenomenon that the tensile force fluctuates in the test process to influence the measurement data is avoided.
Preferably, the pull rod consists of a connector and a stud, and the connector and the stud are fastened and connected through threads; the double-screw bolt include the external screw thread, or the external screw thread with the step, the connector includes the rest of pull rod. After the pull rod is split into the connector and the stud, the stud can be replaced according to silicon core pipes with different diameters and test requirements, the connector is kept unchanged, the clamp parts can be combined in multiple ways, and the flexibility of the clamp is enhanced.
Preferably, a chamfer is arranged below the external thread at the lower part of the pull rod. During hoop stretching, stress concentration of the silicon core pipe at the tail end of the external thread can be avoided by chamfering, and the hoop stress of the silicon core pipe is uniformly distributed. In addition, the chamfer can provide location placed in the middle when the cutting ferrule is rotationally nested, and is convenient to install.
Compared with the prior art, the beneficial effects of the utility model are that:
the inner support and the outer clamp and the two sides of the inner wall and the outer wall of the silicon core pipe are clamped by the pull rod and the clamping sleeve, so that the uniform stress of the silicon core pipe in the circumferential direction is ensured, and the stable and reliable clamping of the silicon core pipe in the axial stretching is realized.
Through setting up special specification screw thread on pull rod and the cutting ferrule, do not harm the condition of silicon core pipe wall as far as possible, increased the axial pulling force of anchor clamps transmission.
By dividing the clamping sleeve into two parts, the clamp is convenient to mount, and the axial tension transmitted by the clamp is adjusted.
Through with the pull rod split for connector and double-screw bolt, the anchor clamps part can multiple combination, has increased the flexibility of anchor clamps.
Drawings
Fig. 1 is an exploded view of embodiment 1 of the present invention.
Fig. 2 is a partial sectional view of embodiment 1 of the present invention.
Description of the figures: the pull rod comprises a pull rod 1, a clamping sleeve 2, a silicon core pipe 3, a nut 4, a connector 11 and a stud 12.
Detailed Description
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, the present embodiment is a silicon core tube tensile test fixture, which includes a pull rod 1, a ferrule 2 and a nut 4.
The pull rod 1 consists of a connector 11 and a stud 12, and the connector 11 and the stud 12 are connected through M16 thread fastening. The pin hole on the connecting head 11 is used for connecting with a joint of a universal machine. M24 external threads on the connecting head 11 are matched with the M24 nut 4 for use, and the clamp is tightly connected with the universal machine joint. The diameter of the upper part of the step on the connector 11 is phi 26mm, and the length is 5 mm; the diameter of the lower part is phi 30mm, and the length is 10 mm. The external thread of the stud 12 is connected with the inner wall of the silicon core pipe 3. The tooth-shaped height of the external thread of the stud 12 is 0.2 mm. The diameter of the external thread of the stud 12 is equal to the inner diameter of the silicon core tube 3. The length of the external thread of the stud 12 is 50 mm. A chamfer is arranged below the external thread of the stud 12, and the length of the chamfer is 15 mm.
The cutting sleeve 2 is two semi-circular hollow pipes with ear edges, and the two semi-circular hollow pipes are fastened and connected through M6 screws. The wall thickness of cutting ferrule 2 is 5 mm. The diameter of the upper part of the stepped hole at the upper part of the cutting sleeve 2 is phi 26mm, and the length of the stepped hole is 5 mm; the diameter of the lower part is the same as the diameter of the internal thread at the lower part of the cutting sleeve 2, and the length is 10 mm. The internal thread at the lower part of the cutting sleeve 2 is connected with the outer wall of the silicon core tube 3. The tooth-shaped height of the internal thread of the cutting sleeve 2 is 0.2 mm. The diameter of the internal thread of the cutting sleeve 2 is 2mm smaller than the external diameter of the silicon core pipe 3. The length of the internal thread of the cutting sleeve 2 is 52 mm. The ear edge of one cutting ferrule 2 is symmetrically provided with 4 through holes with the diameter of phi 6mm along the axis, and the ear edge of the other cutting ferrule 2 is correspondingly provided with 4M 6 thread through holes.
The clamps are used in pairs, selecting a stud 12 and ferrule 2 suitable for the silicon core tube 3. The specific use mode is as follows: taking the process of clamping one end of the silicon core tube 3 as an example, the connector 11 is firstly fastened and connected with the stud 12, and then the stud 12 is rotatably plugged into the inner wall of one end of the silicon core tube 3 until the lower side surface of the step is superposed with the side surface of the silicon core tube 3; then, determining the axial positions of the cutting ferrule 2 and the pull rod 1 according to the matching relationship of the stepped hole and the step, and then fastening and connecting the two cutting ferrules 2 on the outer wall of one end of the silicon core tube 3 through an M6 screw; then, clamping the other end of the silicon core pipe 3 is completed in the same way; and finally, connecting the pin hole on the connector 11 with a connector of a universal machine to complete the clamping of the silicon core tube 3, and starting to perform a tensile test on the silicon core tube 3.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (8)
1. A silicon core tube tensile test fixture comprises a pull rod and a clamping sleeve, wherein an installation structure is arranged at the upper part of the pull rod, and the clamping sleeve is a hollow tube; the pull rod is characterized in that the middle part of the pull rod is provided with a step, and the lower part of the pull rod is provided with an external thread; the upper part of the cutting sleeve is provided with a stepped hole, and the lower part of the cutting sleeve is provided with an internal thread; the pull rod is placed in the clamping sleeve; the diameters of the step and the upper part of the stepped hole are smaller than the diameter of the lower part of the stepped hole, and the step is embedded in the stepped hole; the space between the external thread and the internal thread forms a clamping area of the clamp.
2. The silicon core tube tensile test fixture of claim 1, wherein the profile height of said external thread and said internal thread is 0.2-1.0 mm.
3. The silicon core tube tensile test fixture of claim 1, wherein the diameter of the external thread is 0-2mm larger than the inner diameter of the silicon core tube, and the diameter of the internal thread is 0-2mm smaller than the outer diameter of the silicon core tube.
4. The silicon core tube tensile test fixture of claim 1, wherein the length of said internal thread is 0-5mm longer than the length of said external thread.
5. The silicon core tube tensile test fixture of claim 1, wherein the cutting ferrule is two semicircular hollow tubes with ear edges, and the two semicircular hollow tubes are connected through a fastener on the ear edges.
6. The silicon core tube tensile test fixture of claim 1, further comprising a nut, wherein an external thread matched with the nut is arranged between the mounting structure of the pull rod and the step.
7. The silicon core pipe tensile test fixture of claim 1, wherein the pull rod is composed of a connector and a stud, the connector and the stud are fastened and connected through threads; the double-screw bolt include the external screw thread, or the external screw thread with the step, the connector includes the rest of pull rod.
8. The silicon core tube tensile test fixture of claim 1, wherein a chamfer is provided below the external thread of the lower portion of the pull rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120705996.1U CN215004675U (en) | 2021-04-06 | 2021-04-06 | Silicon core pipe tensile test anchor clamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120705996.1U CN215004675U (en) | 2021-04-06 | 2021-04-06 | Silicon core pipe tensile test anchor clamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215004675U true CN215004675U (en) | 2021-12-03 |
Family
ID=79096886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120705996.1U Expired - Fee Related CN215004675U (en) | 2021-04-06 | 2021-04-06 | Silicon core pipe tensile test anchor clamps |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215004675U (en) |
-
2021
- 2021-04-06 CN CN202120705996.1U patent/CN215004675U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211203 |