CN209513484U - A kind of build concrete metope hardness tester - Google Patents
A kind of build concrete metope hardness tester Download PDFInfo
- Publication number
- CN209513484U CN209513484U CN201822229780.3U CN201822229780U CN209513484U CN 209513484 U CN209513484 U CN 209513484U CN 201822229780 U CN201822229780 U CN 201822229780U CN 209513484 U CN209513484 U CN 209513484U
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- mandril
- valve
- piece
- connector sleeve
- promotion
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Abstract
The utility model relates to a kind of build concrete metope hardness testers, including clamping component, tensioner component, pushing component, sensory package and connector sleeve；Wherein the clamping component is set to the one end of connector sleeve；The tensioner component includes tensioner；The pushing component includes pushing valve, and the promotion valve includes expansion mandril, and the one end for expanding mandril is provided with the expansion-head of taper；The middle part of the expansion mandril is hollow structure；The sensory package includes sensing valve block, elastic strain piece is provided in the middle part of sensing valve block, the sensory package further includes strain mandril, and the one end for straining mandril passes through sensing valve block shell and presses against elastic strain on piece, and the other end for straining mandril is provided with the jacking block of taper；This structure only needs the groove for processing a circular plate type in concrete wall surface that can realize the test to concrete hardness, lower to the wound of concrete, and the instrument connection of this structure is easier to repair.
Description
Technical field
The present invention relates to a kind of build concrete metope hardness testers, belong to building strength detection equipment field.
Background technique
In order to guarantee the intensity of building, concrete is generally required after solidification, hardness with higher, it is however generally that for
The hardness test of concrete is completed in laboratory, and mode is usually that concrete solidifies in laboratory, and passes through reality
It tests indoor desk-top detection device and carries out hardness determination, the hardness with simulation concrete in actual condition after hardening；Such as
Equipment described in CN201721042881.9, it is of course also possible on practical building site, to some of the building having been cured
Part is cut, and is tested, but such operation is bigger to the wound of building, and for load bearing wall, load-bearing pillar
Equal key positions can not also be cut, and critical data can not obtain；Certainly there are also equipment can be mixed to what is had been cured
Solidifying cob wall face carries out hardness test, and the equipment in such as CN201720907540.7, is exactly in the concrete walls having been cured
Face carries out deep drilling, and is tested, it is clear that this equipment can bring the biggish destruction of depth to concrete wall surface, equally
, it is easy to affect building intensity, filling up for drilling is also more troublesome.
Summary of the invention
The technical problem to be solved by the present invention is overcome in the prior art field level concrete test equipment to concrete walls
Wound larger technical problem in face provides a kind of build concrete metope hardness tester.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of build concrete metope hardness tester, including clamping component, tensioner component, pushing component, sensing group
Part and connector sleeve；Wherein the clamping component is set to the one end of connector sleeve, and the clamping component includes several groups extruding plate,
Extruding plate is arranged with respect to the longitudinal axis annular array of connector sleeve, and the cross section of extruding plate is arcuate structure, the tail portion of extruding plate
It is rotatablely connected between the end of connector sleeve；The tensioner component includes a tensioner, and the tensioner includes a promotion
Ring pushes the end of ring to be provided with the promotion piece of several bar shapeds, pushes piece is opposite to push the setting of ring annular array, pushes piece and push away
It is structure as a whole between rotating ring, the end cross-sectional for pushing piece is cylindricality, and a section is provided on the inside of extruding plate is
The embedding groove of column construction pushes the end of piece to be embedded into embedding groove；The pushing component includes a promotion valve, described to push away
Dynamic valve includes a promotion valve shell, pushes and is fixedly connected between the one end of valve shell and the promotion ring of tensioner, described to push away
Dynamic valve shell is internally provided with a piston block, and one end of piston block is provided with an expansion mandril, and the one end for expanding mandril is set
It is equipped with the expansion-head of a taper, wherein the tapered bottom end of expansion-head is located at the hemisphere face end for pushing piece；The taper of expansion-head
Side and the inside face contact for pushing piece；The middle part of the expansion mandril is hollow structure, in described one end for pushing valve shell
Portion is provided with a sliding eye, and an intake valve is provided on the inside of the sliding eye for the mobile offer pressure to piston block
Power；The sensory package includes a sensing valve block, is slidingly sealed between the side wall of the sensing valve block and the inner wall of connector sleeve
Connection, is provided with a closed plate in the tail portion of connector sleeve, and a pressurizing valve is provided in closed plate, senses valve block and connector sleeve
Tail portion between constitute a pressurization section, pressurizeed by pressurizing valve, sense valve block in the middle part of be provided with an elasticity
Foil gauge, the surface of elastic strain piece and the axis of connector sleeve are vertical, and the sensory package further includes a strain mandril, described
Strain mandril is slidably connected with the sliding eye expanded in the middle part of mandril, and the one end for straining mandril passes through sensing valve block shell and presses against bullet
On property foil gauge, the other end for straining mandril is provided with the jacking block of a taper, and the tail portion of the jacking block is provided with an annular
Raised platforms, the compensating plate of an aluminum is provided between the raised platforms and the end of expansion-head.
As a further improvement of the present invention, a support sleeve, the support sleeve packet are also connected with outside the connector sleeve
An annular bracing ring is included, annular array is provided with several groups extruding screw on the bracing ring, is arranged in the end of screw rod
There is a sliding bar, a briquetting is slidably connected on the sliding bar, the briquetting is internally provided with a link slot, even
Holddown spring is provided between the bottom of access slot and the end of sliding bar, holddown spring pushes extruding plate towards connector sleeve.
As a further improvement of the present invention, the extruding plate passes through movable between a connecting joint and connector sleeve end
Connection, the both ends of connecting joint are arranged by being flexibly connected between hinge and extruding plate and connector sleeve in the outside of connecting joint
There is a rotating gasket, a contact groove is provided in rotating gasket, the end of the briquetting is embedded into contact groove.
As a further improvement of the present invention, the deformation for pushing valve shell inner wall to be inlaid with a stainless steel material
Set is pushing the link position of valve shell inner wall corresponding deformation set to be additionally provided with an annular head tank, and deformation set is located at pressure
At annular opening on the inside of power slot；It is slidably and sealingly connected between the piston block and the inner wall of deformation set, the promotion valve shell
On be additionally provided with a check valve, by check valve be head tank and deformation set between annular pressurization space in pressurize.
As a further improvement of the present invention, the sensing valve block includes valve block head and tail lid, and the tail-hood passes through screw thread
It is connected to the tail portion of valve block head, the edge of the elastic strain piece is held on the joint surface of valve block head and tail lid.
As a further improvement of the present invention, one is provided on the strain mandril and the contact end of elastic strain piece
Contact plate, contact plate are contacted with elastic strain piece surface.
As a further improvement of the present invention, the tail portion of the jacking block is provided with a cylindrical slide post, the expansion
The end of mandril is provided with a cylindrical sliding groove, is slidably connected between slide post and sliding groove, the tail portion of the slide post
Support spring is provided between the bottom of sliding groove.
As a further improvement of the present invention, the one end for pushing valve shell is provided with a connecting column, the company
The one end for connecing column is provided with a fixing groove A, and connection, the company are threadably secured between the connecting column and fixing groove A
The other end for connecing column, which is provided between fixing groove a B, the fixing groove B and the outer wall for pushing ring, to be connected through a screw thread.
As a further improvement of the present invention, the tip inside of the extruding plate is provided with a magnet block, on magnet block
It is provided with embedding groove, the end for pushing piece is drawn into embedding groove by magnetic force.
The beneficial effects of the present invention are:
1, the present invention only needs the groove for processing a circular plate type in concrete wall surface that can realize to concrete hardness
Test, lower to the wound of concrete, and compared to deep-hole structures, the instrument connection of this structure is easier to repair.
2, support nested structure that the return to extruding plate may be implemented, to reduce difficulty of this structure with respect to instrument connection installation
Degree, while may be to provide good damping and pretightning force when pushing piece expansion.
3, deformation nested structure can change deformation set and seal to piston block by adjusting the pressure of deformation set inner wall pressure slot
The extruding of part, so that the adjustment to piston block sliding damping is realized, to realize that the positioning to strain mandril is fixed.
4, as a further improvement of the present invention, the promotion piece passes through living between a connecting joint and connector sleeve end
Dynamic connection, the both ends of connecting joint are set on the outside of connecting joint by being flexibly connected between hinge and promotion piece and connector sleeve
It is equipped with a rotating gasket, a contact groove is provided in rotating gasket, the end of the briquetting is embedded into contact groove, connection
Joint structure for push piece outspread quantity and expansion radius provide guarantees, prevent under simple joint structure push piece be unfolded excessively with
Extruding plate separates.
5, sensing valve block is separated structure, it may be convenient to realize the disassembly of foil gauge.
6, the contact area with foil gauge can be improved in contact plate, reduces a possibility that foil gauge is damaged.
7, the support spring structure of slide post tail portion can provide certain resilient pressing force for jacking block and strain mandril,
To guarantee that strain mandril can be sufficiently pressed into contact with test surfaces, foil gauge deformation caused by preventing strain mandril from quickly stretching out
It is excessive and damage, while making the reduction of accurate data degree.
8, the adjustment that connecting column can be convenient and push valve shell, pushes ring distance, while convenient for pushing valve shell, pushing ring
Disassembly.
9, compensating plate can provide certain high pressure support with expansion-head, compared to single group support spring structure, compensating plate
Structure can obtain the higher pressure of limiting value, hardness balance's curve.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is structural schematic diagram of the invention；
In figure: 1, connector sleeve；2, connecting joint；3, extruding plate；4, magnet block；5, support sleeve；6, screw rod；7, briquetting；8,
Rotating gasket；9, valve shell is pushed；10, deformation set；11, piston block；12, intake valve；13, sliding eye；14, valve block head；15, tail
Lid；16, elastic strain piece；17, contact plate；18, pressurization section；19, pressurizing valve；20, check valve；21, mandril is strained；22, swollen
Swollen mandril；23, connecting column；24, ring is pushed；25, piece is pushed；26, support spring；27, slide post；28, expansion-head；29, it compensates
Piece.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, this structure is a kind of build concrete metope hardness tester comprising clamping component, tensioner
4 part such as component, pushing component, sensory package, this 4 parts pass through connector sleeve 1 and are mounted together；Wherein clamping component is set
It is placed in the one end of connector sleeve 1, clamping component includes several extruding plates 3, longitudinal axis annular of the extruding plate 3 with respect to connector sleeve 1
Array setting, the cross section of extruding plate 3 are arcuate structure, the tail portion of extruding plate 3 by the connecting joint 2 of an arc with connect
It is rotatablely connected between the end of set 1；
The tensioner component includes a tensioner, and the tensioner includes a promotion ring 24, pushes the end of ring 24
It is provided with the promotion piece 25 of several bar shapeds, pushes piece 25 is opposite to push the setting of 24 annular array of ring, piece 25 is pushed and pushes ring 24
Between be structure as a whole, it is described push piece 25 end cross-sectional be cylindricality, the inside of extruding plate 3 is provided with a magnet block 4,
The end for pushing piece 25 is drawn into embedding groove by magnetic force, and the edge that section is column construction is provided on magnet block 4
Caulking groove pushes the end of piece 25 to be embedded into embedding groove；
The outside of connecting joint 2 is provided with a rotating gasket 8, a contact groove is provided in rotating gasket 8, it is described
A support sleeve 5 is also connected with outside connector sleeve 1, the support sleeve 5 includes an annular bracing ring, ring on the bracing ring
Shape array is provided with several groups extruding screw 6, and the end of screw rod 6 is provided with a sliding bar, the company of sliding on the sliding bar
It is connected to a briquetting 7, the briquetting 7 is internally provided with a link slot, between the bottom of link slot and the end of sliding bar
It is provided with holddown spring, by holddown spring, so that the end of briquetting 7 is pressed in contact groove；
The pushing component includes a promotion valve, and the promotion valve includes a promotion valve shell 9, pushes valve shell 9
One end and the promotion ring 24 of tensioner between be fixedly connected, the promotion valve shell 9 is internally provided with a piston block 11,
The deformation set 10 for pushing 9 inner wall of valve shell to be inlaid with a stainless steel material, is pushing 9 inner wall corresponding deformation set of valve shell
10 link position is additionally provided with an annular head tank, and deformation set 10 is located at the annular opening on the inside of head tank；It is described
It is slidably and sealingly connected between piston block 11 and the inner wall of deformation set 10, is additionally provided with a check valve on the promotion valve shell 9
20, it is pressurizeed in the annular pressurization space between head tank and deformation set 10 by check valve 20；
One end of piston block 11 is provided with 28 mandrils 22 of expansion, and one end of 28 mandrils 22 of expansion is provided with a taper
Expansion 28, push piece 25 to be freely rotated end wherein the tapered bottom end of expansion 28 is located at, the tapered side of expansion 28
With the inside face contact for pushing piece 25；The middle part of 28 mandrils 22 of the expansion is hollow structure, pushes the one of valve shell 9 described
End is provided with a sliding eye 13, and the inside of the sliding eye 13 is provided with an intake valve 12 for the shifting to piston block 11
It is dynamic that pressure is provided；
The sensory package includes a sensing valve block, sliding between the side wall of the sensing valve block and the inner wall of connector sleeve 1
Dynamic sealing connection, is provided with a closed plate in the tail portion of connector sleeve 1, a pressurizing valve 19, transducer valve is provided in closed plate
A pressurization section 18 is constituted between block and the tail portion of connector sleeve 1, is pressurizeed by pressurizing valve 19, at the middle part of sensing valve block
It is provided with an elastic strain piece 16, the sensing valve block includes valve block head 14 and tail-hood 15, and the tail-hood 15 is connected by screw thread
It is connected to the tail portion of valve block head 14, the edge of the elastic strain piece 16 is held on the joint surface of valve block head 14 and tail-hood 15, bullet
The surface of property foil gauge 16 is vertical with the axis of connector sleeve 1；
The sensory package further includes a strain mandril 21, the strain mandril 21 and the cunning for expanding 28 mandril, 22 middle part
Dynamic hole 13 is slidably connected, and one end of strain mandril 21 passes through sensing valve block shell and presses against on elastic strain piece 16, the strain
A contact plate 17, contact plate 17 and 16 surface of elastic strain piece are provided on mandril 21 and the contact end of elastic strain piece 16
Contact, the other end of strain mandril 21 are provided with the jacking block of a taper, the tail portion of the jacking block be provided with one it is annular convex
Platform is played, the compensating plate 29 of an aluminum, the raised platforms are provided between the raised platforms and the end for expanding 28
Tail portion be provided with a cylindrical slide post 27, the end of 28 mandrils 22 of the expansion is provided with a cylindrical sliding groove,
It is slidably connected between slide post 27 and sliding groove, is provided with support bullet between the tail portion of the slide post 27 and the bottom of sliding groove
Spring 26.
It is preparation state first when this equipment works: the gas of 1 tail portion of connector sleeve is discharged by pressurizing valve 19 first, makes
Entirely sensing valve block is obtained to retract, meanwhile, it is squeezed by means of the elasticity of briquetting 7, so that the gathering of connecting joint 2, extruding plate 3, squeezes
Piece 3 is linked with piece 25 is pushed by magnetic force, because of the promotion of extruding plate 3, so that piece 25 is pushed to collapse mutually, while driving promotion
Ring 24 retreats, and pushes ring 24 to drive and valve shell 9 is pushed to retreat, realize the gathering of whole equipment；
It is followed by zeroing state, the test groove of a circular plate type is processed in concrete surface, this equipment is passed through into correlation
Bracket is placed, and is pressurizeed at this time by pressurizing valve 19 to 1 tail portion of connector sleeve, so that sensing valve block is mobile, and then is pushed
Valve shell 9 and the movement for pushing ring 24, by pushing the extruding for pushing piece 25 on ring 24 so that entire clamp system namely connects
The expansion in joint 2 and extruding plate 3 is connect, so that extruding plate 3 is contacted with the inner sidewall of test groove, and makes 28 centering of expansion；
Expansion 28 after centering make elastic strain piece 16 be pressurized promotion strain mandril 21；When the operating pressure curve of pressurizing valve 19
Close to elastic strain piece 16 pressure valve when, close pressurizing valve 19, while the pressure data of elastic strain piece 16 returned
Zero, it simultaneously, is pressurizeed by check valve 20, enables deformation 10 deformation of set, improve between deformation set 10 and piston block 11
Frictional force；Simultaneously, it is pressurizeed by the way that intake valve 12 is synchronous with pressurizing valve 19 with uniform pressure, time graph, so that expansion 28
Mandril 22 pushes 28 movements of expansion；In order to provide certain bearing stress to expansion 28, and it is unlikely to 28 supports of expansion
Stress is excessive not to have moving section, so being provided with the compensating plate 29 of aluminum, meets the needs of stress extruding；It is supported when meeting
Spring 26 is compressed completely, expansion 28 with compensating plate 29 full contact when and also 19 pressure of intake valve 12 and pressurizing valve increasing
Add the influence to 16 changing value of elastic strain piece level off to 0 when, record 12 pressure value P of intake valve at this time；
In the lab, 12 maximum pressure value of intake valve of different hardness concrete is equally measured by this method；It will not
With standard concrete standard hardness index H and pressure value P carry out H/P linear mapping because different hardness concrete by
Pressure energy power has difference, is compared by the linear graph of live 12 pressure value P of intake valve and H/P and is obtained with hardness number.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (9)
1. a kind of build concrete metope hardness tester, it is characterized in that: include clamping component, tensioner component, pushing component,
Sensory package and connector sleeve；Wherein the clamping component is set to the one end of connector sleeve, and the clamping component includes several groups
Extruding plate, extruding plate are arranged with respect to the longitudinal axis annular array of connector sleeve, and the cross section of extruding plate is arcuate structure, extruding plate
Tail portion and connector sleeve end between be rotatablely connected；The tensioner component includes a tensioner, and the tensioner includes one
A promotion ring pushes the end of ring to be provided with the promotion piece of several bar shapeds, pushes piece is opposite to push the setting of ring annular array, pushes
It is structure as a whole between piece and promotion ring, the end cross-sectional for pushing piece is cylindricality, and one is provided on the inside of extruding plate
Section is the embedding groove of column construction, and the end of piece is pushed to be embedded into embedding groove；The pushing component includes a promotion valve,
The promotion valve includes a promotion valve shell, pushes and is fixedly connected between the one end of valve shell and the promotion ring of tensioner,
The promotion valve shell is internally provided with a piston block, and one end of piston block is provided with an expansion mandril, expands mandril
One end is provided with the expansion-head of a taper, and wherein the tapered bottom end of expansion-head is located at the hemisphere face end for pushing piece；Expansion-head
Tapered side and push piece inside face contact；The middle part of the expansion mandril is hollow structure, in the promotion valve shell
One end be provided with a sliding eye, an intake valve is provided on the inside of the sliding eye for mentioning to the movement of piston block
For pressure；The sensory package includes a sensing valve block, is slided between the side wall of the sensing valve block and the inner wall of connector sleeve
It is tightly connected, the tail portion of connector sleeve is provided with a closed plate, a pressurizing valve is provided in closed plate, sense valve block and company
A pressurization section is constituted between the tail portion of female connector, is pressurizeed by pressurizing valve, is provided with one in the middle part of sensing valve block
Elastic strain piece, the surface of elastic strain piece and the axis of connector sleeve are vertical, and the sensory package further includes a strain mandril,
The strain mandril is slidably connected with the sliding eye expanded in the middle part of mandril, and the one end for straining mandril passes through sensing valve block shell press
In elastic strain on piece, the other end for straining mandril is provided with the jacking block of a taper, and the tail portion of the jacking block is provided with one
The raised platforms of annular, are provided with the compensating plate of an aluminum between the raised platforms and the end of expansion-head.
2. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: outside the connector sleeve
It is also connected with a support sleeve, the support sleeve includes an annular bracing ring, and annular array is provided on the bracing ring
Several groups extruding screw is provided with a sliding bar in the end of screw rod, a briquetting, institute is slidably connected on the sliding bar
That states briquetting is internally provided with a link slot, and holddown spring is provided between the bottom of link slot and the end of sliding bar, pressure
Tight spring pushes extruding plate towards connector sleeve.
3. a kind of build concrete metope hardness tester as claimed in claim 2, it is characterized in that: the extruding plate passes through
Be flexibly connected between one connecting joint and connector sleeve end, the both ends of connecting joint by hinge and extruding plate and connector sleeve it
Between be flexibly connected, a rotating gasket is provided on the outside of connecting joint, a contact groove is provided in rotating gasket, it is described
The end of briquetting is embedded into contact groove.
4. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: the promotion valve shell
Inner wall is inlaid with the deformation set an of stainless steel material, and the link position of valve shell inner wall corresponding deformation set is being pushed to be additionally provided with
One annular head tank, deformation set are located at the annular opening on the inside of head tank；The piston block and deformation set inner wall it
Between be slidably and sealingly connected with, be additionally provided with a check valve on the promotion valve shell, by check valve be head tank and deformation cover
Between annular pressurization space in pressurize.
5. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: the sensing valve block packet
Valve block head and tail lid is included, the tail-hood is threadingly attached to the tail portion of valve block head, and the edge of the elastic strain piece is held on
On the joint surface of valve block head and tail lid.
6. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: the strain mandril and
A contact plate is provided on the contact end of elastic strain piece, contact plate is contacted with elastic strain piece surface.
7. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: the tail portion of the jacking block
It is provided with a cylindrical slide post, the end of the expansion mandril is provided with a cylindrical sliding groove, slide post and sliding
It is slidably connected between slot, is provided with support spring between the tail portion of the slide post and the bottom of sliding groove.
8. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: the promotion valve shell
One end be provided with a connecting column, the one end of the connecting column is provided with a fixing groove A, the connecting column and fixation
Connection is threadably secured between slot A, the other end of the connecting column is provided with fixing groove a B, the fixing groove B and pushes away
It is connected through a screw thread between the outer wall of rotating ring.
9. a kind of build concrete metope hardness tester as described in claim 1, it is characterized in that: the end of the extruding plate
It is provided with a magnet block on the inside of portion, embedding groove is provided on magnet block, the end for pushing piece is drawn into edge by magnetic force
In caulking groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822229780.3U CN209513484U (en) | 2018-12-27 | 2018-12-27 | A kind of build concrete metope hardness tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822229780.3U CN209513484U (en) | 2018-12-27 | 2018-12-27 | A kind of build concrete metope hardness tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209513484U true CN209513484U (en) | 2019-10-18 |
Family
ID=68198044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822229780.3U Expired - Fee Related CN209513484U (en) | 2018-12-27 | 2018-12-27 | A kind of build concrete metope hardness tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209513484U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520874A (en) * | 2018-12-27 | 2019-03-26 | 上海三凯工程咨询有限公司 | A kind of build concrete metope hardness tester |
-
2018
- 2018-12-27 CN CN201822229780.3U patent/CN209513484U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520874A (en) * | 2018-12-27 | 2019-03-26 | 上海三凯工程咨询有限公司 | A kind of build concrete metope hardness tester |
| CN109520874B (en) * | 2018-12-27 | 2023-11-17 | 上海三凯工程咨询有限公司 | Concrete wall hardness tester for building |
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| 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: 20191018 Termination date: 20201227 |