CN211374320U - Half eight characters type concrete test piece anchor clamps - Google Patents
Half eight characters type concrete test piece anchor clamps Download PDFInfo
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- CN211374320U CN211374320U CN201922076696.7U CN201922076696U CN211374320U CN 211374320 U CN211374320 U CN 211374320U CN 201922076696 U CN201922076696 U CN 201922076696U CN 211374320 U CN211374320 U CN 211374320U
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Abstract
The utility model discloses a semi-splayed concrete sample clamp, which comprises a chuck, wherein the chuck is provided with a flange, a rotatable elastic sheet and a cleaning device which are matched with each other; the chuck comprises a clamping part and a semicircular part, a flange is arranged on the chuck, and an object sensor is arranged on the inner side of the flange; the elastic piece and the flange limit the axial movement of the concrete test piece together; the cleaning device comprises an air channel arranged in the chuck; an air inlet pipe is connected above the air passage, a control valve is arranged on the air inlet pipe, the control valve is connected with a PLC (programmable logic controller), and the PLC is electrically connected with the object sensor; the PLC controller opens or closes the control valve through a sensing signal of the object sensor; the clamp not only can automatically clean, but also can facilitate the clamping of the test piece, ensure that the test piece does not deviate, and improve the test accuracy and precision.
Description
Technical Field
The utility model relates to bituminous concrete test piece anchor clamps technical field, concretely relates to half eight characters type concrete test piece anchor clamps.
Background
The direct asphalt concrete tensile test is an important technical means for accurately obtaining a series of tensile parameters such as the tensile strength, the ultimate tensile value, the tensile elastic modulus and the like of the asphalt concrete, and provides an important basis for concrete structure design, theoretical analysis and performance evaluation. However, most of the existing splayed asphalt concrete test piece stretching clamps are clamping heads with semicircular inner walls, the test piece is directly placed on the clamping heads, two ends of the test piece are tensioned to fix the test piece and perform a test, and when the test piece is placed, an operator needs to repeatedly adjust the test piece so as to enable the test piece to be in an accurate position; the test piece is shaken and moved back and forth when being stretched, so that the test efficiency is lower, and the test accuracy is poor.
There are also clamps for fixing a test piece by using a clamp, for example, in 2009, a splayed concrete ultimate tensile test clamp disclosed in chinese patent application (publication No. CN201203556) is used for clamping a test piece during a concrete ultimate tensile test. The clamping device mainly comprises a base frame, clamping rods are hinged in round holes in a base plate of the base frame, and two supporting plates are connected to trapezoidal plates on two sides of the base frame through supporting plate positioning pins respectively. Although the splayed concrete ultimate tensile test fixture provided by the invention can be used for clamping and tensile test on splayed concrete samples, practice shows that the success rate and accuracy rate of the test are low; the locating pin all needs to be installed and dismantled and the layer board position is set up in experiment at every turn, and is more loaded down with trivial details, and the different retentions in the time of the repeated test are put together the nature, influence test effect.
In addition, when a plurality of groups of test pieces are tested in the conventional tensile test, the clamps are required to be cleaned every time when the test pieces are replaced, and residual dust, sand or chips on the test pieces are cleaned so as to avoid influencing the clamping of subsequent test pieces.
Disclosure of Invention
The utility model aims at providing a half eight characters type concrete test piece anchor clamps to the problem that prior art exists.
In order to achieve the above object, the utility model adopts the following technical scheme:
a semi-splayed concrete test piece clamp comprises a chuck, wherein a flange, a rotatable elastic sheet and a cleaning device which are matched with each other are arranged on the chuck;
wherein, one end of the chuck is provided with an opening, and the opening inwards forms an accommodating space; the inner wall of the accommodating space is a curved surface and comprises clamping parts close to two sides of the opening and a semicircular part above the clamping parts; the clamping part and the semicircle are respectively provided with the flanges extending towards the direction of the circle center, and the flanges are arranged on the same side of the chuck; an object sensor is arranged on the inner side of at least one of the flanges;
the elastic pieces are at least one pair and are respectively arranged on the clamping parts through rotating shafts, the elastic pieces are opposite to the different sides of the flanges, and the elastic pieces and the flanges limit the axial movement of the concrete test piece together;
the cleaning device comprises an air passage arranged in the chuck, and the air outlet direction of the air passage is arranged towards the inner wall of the clamping part; an air inlet pipe is connected above the air passage, a control valve is arranged on the air inlet pipe, the control valve is connected with a PLC (programmable logic controller), and the PLC is electrically connected with the object sensor; and the PLC controller opens or closes the control valve through the sensing signal of the object sensor.
The semi-splayed concrete test piece clamp clamps a concrete test piece to be tested through the clamping head, the concrete test piece to be tested is in a vertical state under the action of self gravity, and the head of the concrete test piece to be tested just falls in the clamping part and cannot shake left and right; under the limiting action of the flanges and the elastic pieces, the concrete sample to be tested cannot deviate or move forwards and backwards; the stress of the test piece is ensured to be balanced and comprehensive in the stretching process, and the accuracy and precision of the test are improved.
When a test piece is placed, the flange can prevent the test piece from penetrating out of the other surface of the chuck, and the test piece does not need to be placed by a careful wing, so that one surface of the test piece is worried about leakage; and meanwhile, the elastic piece is clamped on the other surface of the test piece so as to limit the test piece in the clamping part, the elastic piece can provide elastic clamping force to slightly press the test piece to prevent the test piece from shaking, and the test result is not deviated due to excessive clamping force.
The cleaning device can play a role in automatically cleaning the clamping part and the chuck, specifically, when a test piece is loaded into the clamping part, the object sensor on the flange can sense the test piece, so that an object instruction is transmitted to the PLC, the control valve is closed, when the test piece is removed after a test is finished, the object sensor detects that the object leaves and transmits the instruction information to the PLC, so that the control valve is automatically opened, gas is blown out from the air passage, dust, sand, debris and the like remained on the clamping part are blown off, the clamping part is kept clean and free of residues, and the next test piece is convenient to install; the clamping head is prevented from being cleaned by the hairbrush when the test piece is mounted every time, the labor intensity is reduced, and the accuracy and precision of repeated measurement are improved. The PLC controller can also activate or deactivate the entire control valve in response to the start or end of a test.
The blowing-up direction of the air passage is obliquely corresponding to the clamping part, so that the clamping part can be conveniently and accurately cleaned; the object sensor is arranged on the retaining edge, so that on one hand, the position information of the test piece is convenient to feed back, and on the other hand, the object sensor is convenient to install, is connected with the controller through external wiring and transmits signals.
Preferably, the clamping part the flange with the one side of waiting to examine the test piece of flexure strip orientation all is equipped with anti-skidding line, anti-skidding line is the wave, can increase the frictional force of centre gripping, improves fixed stability.
Furthermore, a through hole is formed in the clamping part, and the rotating shaft is arranged in the through hole; one end of the rotating shaft is fixedly connected to the clamping part through a bearing, and the other end of the rotating shaft extends outwards and is provided with a knob; the rotating shaft between the knob and the side wall of the clamping part is connected with the elastic sheet; and a limiting piece is arranged on the clamping part and close to the opening.
The elastic sheet is driven to rotate around the side face of the clamping part through the rotating shaft, the elastic sheet is transferred to a test piece during testing, and the elastic sheet is transferred to the side wall of the clamping part during non-testing, so that the test piece is not affected in clamping; the limiting piece can fix the elastic piece at a specified position to prevent the elastic piece from falling off the test piece.
Preferably, the knob is provided with grains, so that the knob can be conveniently twisted.
Furthermore, the elastic piece comprises a connecting end and a free end, and the connecting end and the free end are in transition connection through a bending part; the connecting end is clamped, screwed or welded on the rotating shaft, and a gap exists between the connecting end and the side wall of the clamping part; the vertical distance between the free end and the retaining edge is smaller than or equal to the thickness of the clamping part.
The elastic piece of the bending structure reduces the contact area between the elastic piece and the clamping part, thereby reducing the friction force and facilitating the rotation of the elastic piece; the free end is close to one side of the flange, and is favorable for being matched with the flange to limit the movement of the test piece.
Furthermore, the side walls of the clamping part and the semicircular part on the two sides are respectively provided with a flange; the three flanges extend towards the middle part respectively and are connected together to form an integral supporting structure, and the object sensor is arranged in the middle part of the supporting structure.
Further, a magnet is embedded in the elastic sheet. The elastic piece can be conveniently stopped at any position on the side wall of the clamping part.
Further, the air passages are a pair of air passages which are respectively and symmetrically arranged in the chuck; the air outlet directions of the two air passages are staggered and respectively face the clamping parts on the opposite sides.
Furthermore, one side of the air passage, which is positioned on the semicircular part, is connected with an air nozzle. The air nozzle is convenient for adjusting the blowing angle and the air volume.
Further, the control valve is a gas electromagnetic valve; the object sensor is one of a photoelectric sensor, an ultrasonic sensor, an infrared sensor or a proximity switch; the air inlet pipe is connected with an external air source.
Furthermore, a pull rod is connected above the chuck; the clamping part and the cleaning device are symmetrically arranged on the central axis of the pull rod. The pull rod is used for fixedly connecting the testing machine.
Further, the semi-splayed concrete sample for the semi-splayed concrete sample clamp comprises an upper fixing part, a testing part and a lower fixing part; the circumferential outer contour of the upper fixing part is a cambered surface and a curved surface, the front end surface and the rear end surface are planes, and the upper fixing part and the testing part are in circular arc transition;
the inner wall contour of the clamping part of the clamp is matched with the outer contour of the upper fixing part; the thickness of the clamping part is greater than or equal to that of the semi-splayed concrete test piece; the opening size of the jig is larger than the size of the test section. So as to ensure that the semi-splayed concrete test piece can be accurately clamped on the clamp head by means of dead weight.
Compared with the prior art, the beneficial effects of the utility model are that: 1. the semi-splayed concrete test piece clamp ensures that the concrete test piece to be tested cannot deviate or move forwards and backwards through the limitation of the flanges and the elastic pieces; the stress of the test piece is ensured to be balanced and comprehensive in the stretching process, and the accuracy and precision of the test are improved; 2. the cleaning device can automatically clean the clamping part and the chuck, and the clamping part is kept clean and has no residue; the clamping head is prevented from being cleaned by a brush when the test piece is mounted every time, the labor intensity is reduced, and the accuracy and precision of repeated measurement are improved; 3. the object sensor can sense a test piece and improve the position information of the test piece so as to automatically open and close the control valve, and automatic air blowing is realized; 4. rotatable elastic sheet can enough be at any time the centre gripping test piece, does not also influence getting of test piece and puts.
Drawings
FIG. 1 is a schematic view of the whole structure of a semi-splayed concrete specimen clamp of the present invention;
FIG. 2 is a schematic structural view of a clamping test piece of the semi-splayed concrete test piece clamp of the utility model;
FIG. 3 is a schematic view of a cross-sectional structure at A-A of the semi-splayed concrete specimen clamp of the present invention;
FIG. 4 is a schematic view of the cleaning control of the semi-splayed concrete specimen clamp of the present invention;
FIG. 5 is a schematic view of the whole structure of another semi-splayed concrete specimen clamp of the present invention;
in the figure: 1. a chuck; 2. blocking edges; 3. an elastic sheet; 301. a connecting end; 302. a free end; 303. a bending section; 4. a clamping portion; 5. a semicircular portion; 6. an airway; 7. an air inlet pipe; 8. a control valve; 9. an air nozzle; 10. an object sensor; 11. a rotating shaft; 12. a knob; 13. a pull rod; 14. a limiting sheet; 15. a test piece; 16. a bearing; 17. a magnet.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The first embodiment is as follows:
as shown in fig. 1 to 3, a semi-splayed concrete sample clamp comprises a chuck 1, wherein a flange 2, a rotatable elastic sheet 3 and a cleaning device which are matched with each other are arranged on the chuck 1;
wherein, one end of the chuck 1 is provided with an opening, and the opening inwards forms an accommodating space; the inner wall of the accommodating space is a curved surface and comprises a clamping part 4 close to two sides of the opening and a semicircular part 5 above the clamping part 4; the back side walls of the clamping part 4 and the semicircular part 5 are respectively provided with the flanges 2 extending towards the direction of the circle center, and one side of one of the flanges 2 close to the elastic sheet 3 is provided with an object sensor 10;
the elastic pieces 3 are a pair and are respectively arranged on the front side wall of the clamping part 4 through a rotating shaft 11, the elastic pieces 3 are arranged opposite to the different sides of the flanges 2, and the elastic pieces 3 and the flanges 2 limit the axial movement (shown as the front-back movement in the figure) of the concrete sample together;
the cleaning device comprises an air passage 6 arranged in the chuck 1, and the air outlet direction of the air passage 6 is arranged towards the inner wall of the clamping part 4; an air inlet pipe 7 is connected above the air passage 6, a control valve 8 is arranged on the air inlet pipe 7, the control valve 8 is connected with a PLC (programmable logic controller) (not shown in the figure), and the PLC is electrically connected with the object sensor 10; the PLC controller opens or closes the control valve 8 by a sensing signal of the object sensor 10.
The semi-splayed concrete test piece clamp clamps a test piece 15 through the clamping head 1, the test piece 15 is in a vertical state under the action of self gravity, and the head of the test piece is just fallen into the clamping part 4 and cannot shake left and right; under the limiting action of the flange 2 and the elastic piece 3, the test piece 15 cannot generate front and back deviation or movement; the stress of the test piece is ensured to be balanced and comprehensive in the stretching process, and the accuracy and precision of the test are improved.
When a test piece is placed, the flange 2 can prevent the test piece 15 from penetrating out of the back of the chuck 1, so that the test piece is not required to be placed by a careful wing, and the rear side surface of the test piece 15 is worried about to leak; meanwhile, the elastic piece 3 is clamped on the front side surface of the test piece 15 so as to limit the test piece 15 in the clamping part 4, the elastic piece 3 can provide elastic clamping force to slightly press the test piece to prevent the test piece from shaking, and excessive clamping force is not generated to cause deviation of a test result.
The cleaning device can play a role in automatically cleaning the clamping part 4 and the accommodating space, specifically, when a test piece 15 is loaded into the accommodating space, the head of the test piece falls on the clamping part 4, the object sensor 10 on the flange 2 can sense the test piece 15, so that an object instruction is transmitted to the PLC, the control valve 8 is closed, when the test piece is removed after a test is finished, the object sensor 10 detects that the object leaves, the instruction information is transmitted to the PLC, the control valve 8 is automatically opened, gas is blown out from the air channel 6, dust, sand particles, debris and the like remained on the clamping part 4 are blown off, the clamping part 4 is kept clean and free of residues, and the next test piece is convenient to install; the clamping head is prevented from being cleaned by the hairbrush when the test piece is mounted every time, the labor intensity is reduced, and the accuracy and precision of repeated measurement are improved. The PLC controller can also activate or deactivate the entire control valve in response to the start or end of a test.
The blowing direction of the air channel 6 is inclined and corresponds to the clamping part 4, so that the clamping part 4 can be cleaned accurately; the object sensor 10 is arranged on the flange 2, so that on one hand, the position information of the test piece can be fed back conveniently, and on the other hand, the object sensor can be installed conveniently and connected with a PLC (programmable logic controller) through external wiring for signal transmission.
Further, as shown in fig. 3, a through hole is formed in the clamping portion 4, and the rotating shaft 11 is arranged in the through hole; one end of the rotating shaft 11 is fixedly connected to the clamping part 4 through a bearing 16, and the other end of the rotating shaft 11 extends outwards and is provided with a knob 12; the elastic sheet 3 is connected to the rotating shaft 11 between the knob 12 and the clamping part 4; and a limiting sheet 14 is further arranged on the clamping part 4 close to the opening.
The elastic sheet 3 is driven to rotate around the side face of the clamping part 4 through the rotating shaft 11, the elastic sheet 3 is rotated to a test piece during testing, and the elastic sheet 3 is rotated to the side wall of the clamping part during non-testing, so that the test piece is not influenced in clamping; the limiting piece 14 can fix the elastic piece 3 at a designated position, and prevent the elastic piece from falling off the test piece.
Preferably, the knob 12 is provided with grains, so that the knob 12 can be twisted conveniently.
Further, the elastic sheet 3 comprises a connecting end 301 and a free end 302, and the connecting end 301 and the free end 302 are transitionally connected through a bending part 303; the connecting end 301 is clamped on the rotating shaft 11, and a gap exists between the connecting end 301 and the side wall of the clamping part 4; the vertical distance between the free end 302 and the flange 2 is slightly smaller than the thickness of the clamping part 4, so that the free end is matched with the flange 2 to limit the movement of the test piece.
The elastic piece 3 with the bending structure reduces the contact area between the elastic piece 3 and the clamping part 4, thereby reducing the friction force and facilitating the rotation of the elastic piece 3.
Further, the air passages 6 are a pair of air passages which are respectively and symmetrically arranged in the chuck 1; the air outlet directions of the two air passages 6 are staggered and respectively face the clamping parts 4 at the opposite sides.
Further, an air nozzle 9 is connected to one side of the air passage 6 located at the semicircular part. The air nozzle 9 is convenient for adjusting the blowing angle and the air volume.
Further, the control valve 8 is a gas solenoid valve, such as a VCB series solenoid valve manufactured by SMC corporation; the object sensor 10 is a model KJT-ST series photoelectric sensor, the air inlet pipe is connected with an external air source, and the external air source can be an air compressor.
Further, a pull rod 13 is connected above the chuck 1; the clamping part 4 and the cleaning device are symmetrically arranged by the central axis of the pull rod 13. The pull rod 13 is used for fixedly connecting the testing machine.
Example two:
the difference between this embodiment and the first embodiment is that the arrangement of the retaining edges is different.
Specifically, as shown in fig. 5, the semi-splayed concrete sample clamp comprises a clamp head 1, wherein a flange 2, a rotatable elastic sheet 3 and a cleaning device which are matched with each other are arranged on the clamp head 1;
the clamping head comprises a clamping part and a semicircular part which are integrally formed, the clamping part and the semicircular part form an accommodating space with a lower opening, and the inner wall of the accommodating space is a curved surface; the clamping part 4 and the semicircular part 5 are respectively provided with the flanges 2 extending towards the direction of the circle center, and the three flanges 2 are all arranged on the same side of the chuck; the three flanges 2 extend towards the middle part respectively and are connected together to form an integral supporting structure, and the object sensor 10 is arranged in the middle part of the supporting structure;
the elastic pieces 3 are a pair and are respectively arranged on the clamping part 4 through rotating shafts 11, the elastic pieces 3 are arranged opposite to the different sides of the flanges 2, and the elastic pieces 3 and the flanges 2 limit the front and back movement of the concrete sample together;
the cleaning device comprises an air passage 6 arranged in the chuck 1, and the air outlet direction of the air passage 6 is arranged towards the inner wall of the clamping part 4; an air inlet pipe 7 is connected above the air passage 6, a control valve 8 is arranged on the air inlet pipe 7, the control valve 8 is connected with a PLC (programmable logic controller), and the PLC is electrically connected with the object sensor 10; the PLC controller opens or closes the control valve 8 by a sensing signal of the object sensor 10.
Example three:
the embodiment provides a setting mode of a cleaning device, specifically, a through air passage 6 is formed in the upper half part of a chuck 1, internal threads are respectively formed at two ends of the air passage 6, and an air inlet pipe 7 can be screwed on the upper part of the air passage 6; the lower side of the air duct 6 is located at the inner wall of the semicircular portion 5 and may be screwed with an air nozzle 9. A control valve 8 may be provided at the upper end of the cartridge.
Example four:
the present embodiment is different from the first embodiment in that a magnet is provided on the elastic sheet 3.
As shown in fig. 3, the free end 302 of the elastic sheet 3 has a magnet 17 embedded therein. When the chuck 1 is made of metal materials such as cast iron and the like, the magnet 17 can be adsorbed on the chuck 1; so as to facilitate the stay of the elastic sheet 3 at any position on the side wall of the clamping part 4.
Example five:
the embodiment provides a semi-splayed concrete test piece which comprises an upper fixing part, a testing part and a lower fixing part; the circumferential outer contour of the upper fixing part is a cambered surface and a curved surface, the front end surface and the rear end surface are planes, and the upper fixing part and the testing part are in circular arc transition;
the inner wall contour of the clamping part of the clamp is matched with the outer contour of the upper fixing part; the thickness of the clamping part is greater than or equal to that of the semi-splayed concrete test piece; the opening size of the jig is larger than the size of the test section. So as to ensure that the semi-splayed concrete test piece can be accurately clamped on the clamp head by means of dead weight.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A semi-splayed concrete test piece clamp comprises a chuck, and is characterized in that a flange, a rotatable elastic sheet and a cleaning device which are matched with each other are arranged on the chuck;
wherein, one end of the chuck is provided with an opening, and the opening inwards forms an accommodating space; the inner wall of the accommodating space is a curved surface and comprises clamping parts close to two sides of the opening and a semicircular part above the clamping parts; the clamping part and the semicircle are respectively provided with the flanges extending towards the direction of the circle center, and the flanges are arranged on the same side of the chuck; an object sensor is arranged on the inner side of at least one of the flanges;
the elastic pieces are at least one pair and are respectively arranged on the clamping parts through rotating shafts, the elastic pieces are opposite to the different sides of the flanges, and the elastic pieces and the flanges limit the axial movement of the concrete test piece together;
the cleaning device comprises an air passage arranged in the chuck, and the air outlet direction of the air passage is arranged towards the inner wall of the clamping part; an air inlet pipe is connected above the air passage, a control valve is arranged on the air inlet pipe, the control valve is connected with a PLC (programmable logic controller), and the PLC is electrically connected with the object sensor; and the PLC controller opens or closes the control valve through the sensing signal of the object sensor.
2. The semi-splayed concrete specimen clamp according to claim 1, wherein a through hole is arranged on the clamping part, and the rotating shaft is arranged in the through hole; one end of the rotating shaft is fixedly connected to the clamping part through a bearing, and the other end of the rotating shaft extends outwards and is provided with a knob; the rotating shaft between the knob and the side wall of the clamping part is connected with the elastic sheet; and a limiting piece is arranged on the clamping part and close to the opening.
3. The semi-splayed concrete sample clamp according to claim 1 or 2, wherein the elastic piece comprises a connecting end and a free end, and the connecting end and the free end are in transition connection through a bending part; the connecting end is clamped, screwed or welded on the rotating shaft, and a gap exists between the connecting end and the side wall of the clamping part; the vertical distance between the free end and the retaining edge is smaller than or equal to the thickness of the clamping part.
4. The semi-splayed concrete sample clamp according to claim 1, wherein the side walls of the clamping part and the semicircular part on both sides are provided with one rib; the three flanges extend towards the middle part respectively and are connected together to form an integral supporting structure, and the object sensor is arranged in the middle part of the supporting structure.
5. The semi-splayed concrete specimen holder as recited in claim 1, wherein the resilient sheet has a magnet embedded therein.
6. The semi-splayed concrete specimen clamp according to claim 1, wherein the air passages are a pair of air passages which are respectively and symmetrically arranged in the clamping heads; the air outlet directions of the two air passages are staggered and respectively face the clamping parts on the opposite sides.
7. The semi-splayed concrete specimen holder according to claim 1 or 6, characterized in that an air nozzle is connected to one side of the air passage located at the semicircular part.
8. The semi-splayed concrete specimen clamp according to claim 1, wherein the control valve is a gas solenoid valve; the air inlet pipe is connected with an external air source.
9. The semi-splayed concrete specimen clamp according to claim 1, characterized in that a pull rod is connected above the chuck; the clamping part and the cleaning device are symmetrically arranged on the central axis of the pull rod.
10. A concrete specimen in a shape of Chinese character 'ba' for the concrete specimen jig in a shape of Chinese character 'ba' as claimed in claim 1, wherein the concrete specimen in a shape of Chinese character 'ba' comprises an upper fixing portion, a testing portion and a lower fixing portion; the circumferential outer contour of the upper fixing part is a cambered surface and a curved surface, the front end surface and the rear end surface are planes, and the upper fixing part and the testing part are in circular arc transition;
the inner wall contour of the clamping part of the clamp is matched with the outer contour of the upper fixing part; the thickness of the clamping part is greater than or equal to that of the semi-splayed concrete test piece; the opening size of the jig is larger than the size of the test section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922076696.7U CN211374320U (en) | 2019-11-27 | 2019-11-27 | Half eight characters type concrete test piece anchor clamps |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922076696.7U CN211374320U (en) | 2019-11-27 | 2019-11-27 | Half eight characters type concrete test piece anchor clamps |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236097A (en) * | 2021-12-17 | 2022-03-25 | 河南省科学院地理研究所 | Agricultural non-point source soil pollution detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236097A (en) * | 2021-12-17 | 2022-03-25 | 河南省科学院地理研究所 | Agricultural non-point source soil pollution detection device |
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