CN216955455U - Clamp for testing tensile strength of wood grain - Google Patents
Clamp for testing tensile strength of wood grain Download PDFInfo
- Publication number
- CN216955455U CN216955455U CN202220471910.8U CN202220471910U CN216955455U CN 216955455 U CN216955455 U CN 216955455U CN 202220471910 U CN202220471910 U CN 202220471910U CN 216955455 U CN216955455 U CN 216955455U
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- clamping
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- 238000012360 testing method Methods 0.000 title claims abstract description 95
- 239000002023 wood Substances 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract 1
- 230000002146 bilateral effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a clamp for testing the tensile strength of wood grain, which comprises two clamping devices, a clamping device and a clamping device, wherein the two clamping devices are used for clamping and fixing two ends of a test piece; the utility model has convenient installation and disassembly of the test piece, can be directly fixed on the chuck of the universal testing machine with an integrated clamping jaw, and can also be connected with the universal testing machine with a replaceable chuck, so as to solve the problem that the traditional method can not smoothly test the tensile strength of the wood grain.
Description
Technical Field
The utility model relates to the technical field of wood detection tests, in particular to a clamp for testing the tensile strength of wood grain.
Background
The tensile strength of the wood along grain is an important index for measuring the strength of the wood structural member, and a test piece size and a method for testing the tensile strength of the wood along grain are provided in a test method for the tensile strength of the wood along grain (GB 1938-. For wood, the tensile strength of the straight grains is high, the compressive strength of the transverse grains is low, and two problems can be found when the method is adopted, wherein one problem is that the clamping part of the test piece is easy to slip from the clamping opening of the testing machine, and the other problem is that the wood of the clamping part of the test piece is crushed along the direction of the transverse grains. The clamping part at the end of the test piece is firstly damaged before the tensile strength of the wood grain is damaged, so that the tensile strength of the wood grain cannot be measured smoothly.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a clamp for testing the tensile strength of a wood grain, which solves the problem that the clamping part of a wood test piece is easy to fall off or be damaged from a clamping opening of an existing testing machine, so that the detection cannot be carried out smoothly.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the device comprises two clamping devices for respectively clamping and fixing two ends of a test piece; the clamping device comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are connected through a bolt; the two clamping devices are respectively connected with the first connecting piece and used for connecting a universal testing machine with the undetachable chuck.
In practical application, the clamping device is respectively clamped and fastened at two ends of a test piece through two clamping devices to clamp and fix the test piece, the clamping device comprises a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are fixedly connected through bolts, then the two clamping devices are respectively connected with a first connecting piece, and the two clamping devices are connected to a chuck of a universal testing machine with an integrated clamping jaw outside through the first connecting piece and then are tested.
Furthermore, the first clamping plate is provided with at least one first through hole and at least one first threaded hole, the first through hole is used for being matched with the first bolt to be connected with the first connecting piece, and the first threaded hole is used for being matched with the bolt to be connected with the second clamping plate; a first clamping groove is formed in the first clamping plate, the upper portion of the first clamping groove is rectangular, and the lower portion of the first clamping groove is trapezoidal and used for corresponding to the shape of a test piece.
Furthermore, a second through hole corresponding to the first through hole and a second threaded hole corresponding to the first threaded hole are formed in the second clamping plate; a second clamping groove corresponding to the first clamping groove is formed in the second clamping plate; the upper part of the second clamping groove is rectangular, and the lower part of the second clamping groove is trapezoidal and is used for corresponding to the shape of the test piece.
Further, steel wedges which are pushed from the outside are arranged at the two clamped ends of the test piece so as to increase the friction force between the test piece and the clamping device.
Further, the first connecting piece comprises a fixed plate and a pulling plate which are fixedly connected; the fixing plate is a rectangular block provided with a first groove, the rectangular block is provided with at least one third through hole penetrating through the first groove, and a first bolt penetrates through the third through hole; the first bolt penetrates through the first through hole and the second through hole and is used for connecting the clamping device and the first connecting piece.
Furthermore, the pulling plate is arranged at the upper end of the fixed plate; the pulling plate is a rectangular plate, at least one fourth through hole is formed in the pulling plate, the rectangular plate is convenient to clamp, and the clamping opening of the external testing machine is convenient to clamp the first connecting piece.
Further, the first connecting piece is connected with the second connecting piece, and the second connecting piece is used for being connected with a universal testing machine with a replaceable external chuck.
Furthermore, the second connecting piece is a cylinder, one end of the cylinder is provided with a second groove, at least one fifth through hole penetrates through the groove, and a first bolt penetrates through the fifth through hole; the pull plate is embedded into the second groove of the cylinder, the first bolt penetrates through the fifth through hole and the fourth through hole to enable the pull plate to be connected with the cylinder, and the second connecting piece penetrates through the fifth through hole and the fourth through hole through the first bolt to be connected with the first connecting piece.
Furthermore, a sixth through hole is formed in the cylinder, and a second bolt penetrates through the sixth through hole and is used for being connected with a universal testing machine with a replaceable external chuck.
The utility model discloses a clamp for testing the tensile strength of wood grain, which has the following beneficial effects:
1. the clamping device is adopted to clamp the test piece tightly and protect the test piece, so that the test piece is prevented from falling off from a clamping opening of the testing machine or the clamping opening of the testing machine damages the test piece in the testing process, and the test cannot be carried out smoothly.
2. The utility model can be directly fixed on the chuck of the universal testing machine with the integrated clamping jaw through the first connecting piece and the second connecting piece, and can also be connected with the universal testing machine with the replaceable chuck, thereby ensuring the smooth running of the test.
Drawings
Fig. 1 is a perspective view of a jig for testing the tensile strength of wood grain according to the present invention.
Fig. 2 is a schematic structural view of the first splint of the present invention.
Fig. 3 is a schematic structural view of a second splint of the present invention.
Fig. 4 is a schematic structural diagram of a first connecting member of the present invention.
Fig. 5 is a schematic structural view of a second connector according to the present invention.
Wherein, 1, a first splint; 2. a second splint; 3. a first connecting member; 4. a second connecting member; 5. steel wedge; 6. a test piece; 7. a second bolt; 8. a first latch; 9. a bolt; 10. a clamping device; 11. a first through hole; 12 a first threaded hole; 13. a first card slot; 21. a first through hole; 22. a first threaded hole; 23. a first card slot; 31. a third through hole; 32. a fourth via hole; 33. pulling a plate; 34. a fixing plate; 41. a sixth through hole; 42. a fifth through hole; 43. a first pin.
Detailed Description
While the utility model has been described in terms of specific embodiments for the purpose of facilitating understanding by those skilled in the art, it is to be understood that the utility model is not limited in scope to the specific embodiments, and that various changes in form and detail will become apparent to those skilled in the art upon a reading of the following claims and are intended to be covered by the utility model.
According to the first embodiment of the present application, referring to fig. 1, the clamp for testing the tensile strength of the wood grain includes two clamping devices 10 for clamping and fixing two ends of a test piece 6; the clamping device 10 comprises a first clamping plate 1 and a second clamping plate 2, the first clamping plate 1 and the second clamping plate 2 are close to each other, the test piece 6 is clamped between the first clamping plate 1 and the second clamping plate 2, and the first clamping plate 1 and the second clamping plate 2 are connected through a bolt 9; two symmetrically arranged clamping devices 10 are respectively connected with the first connecting piece 3, then are connected with a universal testing machine with the undetachable chuck through the first connecting piece 3, and then are used for testing the tensile strength of the wood along the grains.
As a further solution of the clamping device 10 of the present embodiment, referring to fig. 2 and fig. 3, the first clamping plate 1 is provided with two first through holes 11 and four threaded holes 12, the two first through holes 11 are used for cooperating with the two first bolts 8 to connect the first connecting member 3, and the four threaded holes 12 cooperate with the four bolts 9 to connect the second clamping plate 2; first draw-in groove 13 has been seted up on first splint 1, and first draw-in groove 13 upper portion shape is the rectangle, and rectangular shape, size are unanimous with cuboid position shape, the size at test piece both ends, and the lower part shape is the trapezoidal of bilateral symmetry, is the trend of indenting gradually for correspond the shape of test piece, indented portion can effectively prevent that test piece 6 from producing in the test process and slide.
Two second through holes 21 corresponding to the first through holes 11 and four second threaded holes 22 corresponding to the first threaded holes are formed in the second clamping plate 2; a second clamping groove 23 corresponding to the first clamping groove 13 is formed in the second clamping plate 2; the shape of the upper part of the second clamping groove 23 is rectangular, the shape and the size of the rectangular shape are consistent with those of the cuboid parts at the two ends of the test piece, the shape of the lower part of the second clamping groove is trapezoidal with bilateral symmetry, the second clamping groove is gradually indented for corresponding to the shape of the test piece, and the indented part can effectively prevent the test piece 6 from sliding in the test process.
The steel wedges 5 which are pushed from the outside are arranged at the two ends of the test piece 6 clamped by the clamping device 10, and the steel wedges 5 provide pressure to the test piece 6 along the cross grain direction so as to increase the friction force between the test piece 6 and the clamping device 10, and simultaneously, the wood fiber of the test piece 6 becomes compact, and the possibility of slippage of the test piece 6 in the stretching process is reduced.
As a further aspect of the first connecting member 3 of the present embodiment, referring to fig. 4, the first connecting member 3 includes a fixed plate 34 and a pulling plate 33 fixedly connected; the fixing plate 34 is a rectangular block provided with a first groove, the rectangular block is provided with two pairs of third through holes 31 penetrating through the first groove, and the third through holes 31 are internally penetrated with first bolts 8; the clamping device 10 is embedded in the first groove of the rectangular block, and the first pin 8 passes through the first through hole 11 and the second through hole 21, so that the first connecting piece 3 is connected with the clamping device 10.
The pulling plate 33 is arranged at the upper end of the fixing plate 34; the pulling plate 33 is a rectangular plate, two fourth through holes 32 are reserved on the pulling plate 33, and a clamping opening of an external testing machine can conveniently clamp the rectangular plate-shaped pulling plate 33.
The working principle of the clamp for testing the tensile strength of the wood grain is as follows:
in practical application, one end of a test piece 6 is attached and placed in a first clamping groove 13 of a first clamping plate 1, a second clamping plate 2 is taken, a second clamping groove 23 is attached to the test piece 6, the second clamping plate 2 is enabled to lean against the first clamping plate 1 to clamp the test piece 6, the first clamping plate 1 and the second clamping plate 2 are fixedly connected through four bolts, the other end of the test piece 6 is clamped in the same way, two steel wedges 5 are pushed into two ends of the top of the clamped test piece 6 from the outside to increase the friction force of the test piece 6 on a clamping device 10 to prevent the test piece 6 from sliding, then two symmetrically arranged clamping devices 10 are respectively embedded into first grooves of a fixing plate 34 of a first connecting piece 3, the first connecting piece 3 and the clamping device 10 are connected through two first bolts 8, and finally the two pull plates 33 of the first connecting plate 3 are respectively connected to a universal testing machine with an integrated clamping jaw on the outside, the wood grain tensile strength test was then started.
The second embodiment is a jig for testing the tensile strength of wood grain, which is different from the first embodiment in that the first connecting member 3 is connected with the second connecting member 4, and the second connecting member 4 is used for being connected with a universal testing machine with a replaceable external chuck.
Referring to fig. 5, the second connecting member 4 is a cylinder, one end of the cylinder is provided with a second groove 43, and two fifth through holes 42 are formed through the second groove 43, and the first bolt 8 penetrates through the fifth through holes 42; the pulling plate 33 of the first connecting piece 3 is embedded into the second groove 43 of the second connecting piece 4, and the second connecting piece 4 and the first connecting piece 3 are connected by the first bolt 8 passing through the fifth through hole 42 and the fourth through hole 32.
The cylinder is provided with a sixth through hole 41, a second bolt 7 penetrates through the sixth through hole 41 and is used for being connected with a universal testing machine with a replaceable external chuck, and then the test of the tensile strength of the wood along the grain is started.
While the present invention has been described in detail with reference to the embodiments, the scope of the present invention should not be limited to the embodiments. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (9)
1. The utility model provides a anchor clamps for testing timber is along line tensile strength which characterized in that: comprises two clamping devices (10) for clamping and fixing two ends of a test piece (6) respectively;
the clamping device (10) comprises a first clamping plate (1) and a second clamping plate (2), and the first clamping plate (1) and the second clamping plate (2) are connected through a bolt (9);
the two clamping devices (10) are respectively connected with the first connecting piece (3) and used for connecting a universal testing machine with the undetachable chuck.
2. The jig for testing the down-grain tensile strength of wood according to claim 1, wherein: the first clamping plate (1) is provided with at least one first through hole (11) and at least one first threaded hole (12), the first through hole (11) is used for being matched with the first bolt (8) to be connected with the first connecting piece (3), and the first threaded hole (12) is used for being matched with the bolt (9) to be connected with the second clamping plate (2); a first clamping groove (13) is formed in the first clamping plate (1); the upper part of the first clamping groove (13) is rectangular, and the lower part of the first clamping groove is trapezoidal and is used for corresponding to the shape of the test piece (6).
3. The jig for testing the down-grain tensile strength of wood according to claim 2, wherein: a second through hole (21) corresponding to the first through hole (11) and a second threaded hole (22) corresponding to the first threaded hole (12) are formed in the second clamping plate (2); a second clamping groove (23) corresponding to the first clamping groove (13) is formed in the second clamping plate (2); the upper part of the second clamping groove (23) is rectangular, and the lower part of the second clamping groove is trapezoidal and is used for corresponding to the shape of the test piece (6).
4. The jig for testing the down-grain tensile strength of wood according to claim 1, wherein: and steel wedges (5) pushed from the outside are arranged at the two clamped ends of the test piece (6) so as to increase the friction force between the test piece (6) and the clamping device (10).
5. The jig for testing the down-grain tensile strength of wood according to claim 3, wherein: the first connecting piece (3) comprises a fixed plate (34) and a pulling plate (33) which are fixedly connected; the fixing plate (34) is a rectangular block provided with a first groove, the rectangular block is provided with at least one third through hole (31) penetrating through the first groove, and a first bolt (8) penetrates through the third through hole (31); the first bolt (8) passes through the first through hole (11) and the second through hole (21).
6. The jig for testing the down-grain tensile strength of wood according to claim 5, wherein: the pulling plate (33) is arranged at the upper end of the fixing plate (34); the pulling plate (33) is a rectangular plate, and at least one fourth through hole (32) is formed in the pulling plate (33).
7. The jig for testing the down-grain tensile strength of wood according to claim 6, wherein: the first connecting piece (3) is connected with the second connecting piece (4), and the second connecting piece (4) is used for being connected with a universal testing machine with a detachable external chuck.
8. The jig for testing the down-grain tensile strength of wood according to claim 7, wherein: the second connecting piece (4) is a cylinder, one end of the cylinder is provided with a second groove (43), at least one fifth through hole (42) penetrates through the second groove (43), and a first bolt (8) penetrates through the fifth through hole (42); the pulling plate (33) is embedded into the second groove (43) of the cylinder, and the first bolt (8) penetrates through the fifth through hole (42) and the fourth through hole (32) to connect the pulling plate (33) and the cylinder.
9. The jig for testing the down-grain tensile strength of wood according to claim 8, wherein: the cylinder is provided with a sixth through hole (41), and a second bolt (7) penetrates through the sixth through hole (41) and is used for being connected with a universal testing machine with a replaceable external chuck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220471910.8U CN216955455U (en) | 2022-03-02 | 2022-03-02 | Clamp for testing tensile strength of wood grain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220471910.8U CN216955455U (en) | 2022-03-02 | 2022-03-02 | Clamp for testing tensile strength of wood grain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216955455U true CN216955455U (en) | 2022-07-12 |
Family
ID=82293118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220471910.8U Expired - Fee Related CN216955455U (en) | 2022-03-02 | 2022-03-02 | Clamp for testing tensile strength of wood grain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216955455U (en) |
-
2022
- 2022-03-02 CN CN202220471910.8U patent/CN216955455U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220712 |