CN106679912A - Electromagnetic-driven lossless resiliometer and measuring method of the same - Google Patents
Electromagnetic-driven lossless resiliometer and measuring method of the same Download PDFInfo
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- 239000004567 concrete Substances 0.000 description 6
- 238000009659 non-destructive testing Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0091—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by using electromagnetic excitation or detection
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Abstract
The invention discloses an electromagnetic-driven lossless resiliometer. The electromagnetic-driven lossless resiliometer includes a resiliometer housing with a cavity, a handle and a tube, wherein a fixed block and a movable block; a strike hammer is embedded in the moable block; the front end edge of the movable block fits a trigger; and a coil which is communicated with a power supply is wound around the fixed block. The electromagnetic-driven lossless resiliometer uses magnetic repulsion to replace the spring pressure of a traditional resiliometer as the impact power supply for the strike hammer, and takes the magnetic repulsion to replace the tension of an extension spring of the traditional resiliometer as a rebound value detection mechanism, and has the advantages of long service life and high accuracy compared with the traditional spring type resiliometer.
Description
Technical field
The invention belongs to concrete nondestructive testing equipment technical field, is related to lossless reisilometer and the survey of a kind of Electromagnetic Drive
Amount method.
Background technology
In civil engineering detection, the Non-Destructive Testing of existing reinforced concrete structure intensity is a very important detection
Project, and reisilometer is then most important instrument and equipment in concrete crushing strength detection.Reisilometer has simple to operate, carrying
The characteristics of facilitating, is very suitable for building structure scene Non-Destructive Testing.Although successively have developed both at home and abroad for a long time a series of
For the instrument of concrete strength non-damaged detcting, but reisilometer still remains it in the non-damaged inspection of concrete crushing strength
Leading position in survey field.
Current reisilometer is by the use of metal spring as power and resilience measuring mechanism.This design causes spring
Recycling rate of waterused, resilience precision etc. determine the service life and precision of reisilometer.But metal spring is under long-term reuse
Can relax, coefficient of elasticity is reduced, therefore recycling rate of waterused is relatively low, later stage precision is forbidden, while also complex structure, weight
The shortcomings of larger, inconvenient maintenance.
The content of the invention
Present invention solves the problem in that overcoming the deficiencies in the prior art, there is provided a kind of lossless reisilometer of Electromagnetic Drive and
Measuring method, short life, the recycling rate of waterused that can solve current reisilometer be low, the easy defect such as lax.
The present invention is to be achieved through the following technical solutions：
A kind of lossless reisilometer of Electromagnetic Drive, including the resiliometer casing, handle and the gun barrel that are provided with cavity, sets in cavity
Have and determine block and motion block, motion block is embedded with elastic hammer, front edge and the trigger of motion block fit；Determine to be wound with block and power supply phase
The coil of connection；
Elastic stem runs in the passage of launching an attack that gun barrel is opened up, and elastic stem scaling spring, elastic stem are arranged with elastic stem
Also it is connected with the push rod for going deep into cavity；
Rule is additionally provided with gun body, rule is provided with pointer segment and pointer blocks, and in its end pointer return is additionally provided with
Bar.
Described motion block is connected by slide rail with guide pillar, after being driven by electromagnetic force or back pressure elastic force, can be before guide pillar
After move；Determine block to be also fixedly connected with the guide columns.
Described block of determining is electric magnet, and power supply is arranged on cavity outside, and it is additionally provided with voltmeter between coil；
Motion block is armature, determines to leave primary clearance δ between block and motion block0；
Block is determined by the static equilibrium electric current in coil, produce static electromagnetic repulsion and push motion block as electromagnetic spring.
Described push rod front end is provided with locating fastener, and gun barrel is provided with the locating groove matched with it；It is arranged on push rod
There is push rod to scale spring.
The length of the pointer segment vertical direction projection is more than the distance between elastic hammer and resiliometer casing.
A kind of measuring method of the lossless reisilometer of the Electromagnetic Drive, including following operation：
Before measurement, lossless reisilometer is pressed to tested plane by the tested plane of elastic stem perpendicular contact, makes elastic stem scale bullet
Spring is in compressive state, and attack bar part indentation reisilometer drives push rod transverse shifting inwards, promotes elastic hammer in scaling spring
The firing position specified is moved to while being positioned by trigger, now motion block and determine gap between block be setting value δ0；Coil with it is straight
Stream power on, the coil determined on block is produced for the setting static electromagnetic repulsion of motion block by electromagnetic induction, while passing through voltage
Apparent survey real-time voltage；
During measurement, cocking, elastic hammer pushes push rod movement, the elastic hammer in moving process under electromagnetic repulsion force effect
Can contact with pointer segment, elastic hammer drives pointer segment to cause pointer blocks to return to zero-bit, and now pointer blocks are limited and stopping is transported
Dynamic, the elastic hammer for continuing to move afterwards is crossed reisilometer pointer segment and is continued to left movement, after elastic hammer touches elastic stem, bullet
Hammer rebounds under force, and the motion block ined succession in elastic hammer overcomes the electromagnetic repulsion force for determining solenoid generation on block reversely to transport
Dynamic, now pointer segment (7) can be stuck in the shaft shoulder of rear side and move therewith；
Locating fastener when elastic hammer contacts elastic stem positioned at push rod end is just moved in locating groove, by push rod
Fix；The rebound value of the tested plane is obtained by reading pointer block reading on the scale.
After completing one-shot measurement, elastic stem is set to leave tested plane, the elastic stem scaling spring in compressive state is automatic
Equilbrium position is returned to, while driving elastic stem lateral movement to the left, locating fastener projection can be received when setting position is moved to
To the extruding of resiliometer casing so as to depart from locating groove, push rod stretches out elastic stem again under the thrust of elastic stem scaling spring；
The elastic hammer for completing one-shot measurement rests on the left side of pointer segment, when being measured next time, moves in push rod band
Pointer segment can be moved right with elastic hammer during hammer is moved right, in this process, with the motion block of elastic hammer linkage with it is fixed
The spacing of block reduces, and electromagnetic repulsion force increases；
After pointer segment touches pointer return pin in the presence of return pin thrust, continue elastic hammer and the motion block for moving
The right side of pointer segment can be moved to, is to measure ready next time after elastic hammer is positioned again by trigger.
Electromagnetic spring rigidity is controlled by the dynamics Controlling of motion block；
The kinetics equation of motion block is：
In formula, m1For jump bit and the gross mass of motion block；
And following formula is obtained by voltage controling compensation：
m1Gcos θ-f (i, δ)=- k*Δδ (7)
In formula, k*For electromagnetic spring rigidity, k*=ki(kI-k0) (8)
Wherein：
Formula (7) is updated to formula (4), can obtain motion block 11 kinetics equation, second expression-form：
In formula, k and x1The practical stiffness of electromagnetic spring and the absolute displacement of motion block are represented respectively；Will according to control when using
Ask and air gap increment Delta δ, current constant is kept, to control electromagnetic spring rigidity.
Compared with prior art, the present invention has following beneficial technique effect：
The present invention produces repulsive force by DC electromagnet by using the principle of electromagnetic spring to the armature of impact hammer, pushes away
Dynamic impact hammer quick washing.When trip rod resilience, the electromagnetic repulsion force detects power as rebound value, is determined by standard test
The relation gone out between the hardness and intensity of impact hammer rebound height, the rigidity of electromagnetic spring and concrete material is strong so as to realize
Degree detection.
The present invention replaces the spring pressure of traditional reisilometer with electromagnetic repulsion force, used as the dynamic impact problem source of elastic hammer；With electricity
Magnetic repulsion replaces the tension spring tension of traditional reisilometer, used as rebound value testing agency；Have relative to traditional spring reisilometer
There are long service life, high precision.
The present invention utilizes a kind of advanced technology of the active force powered motion body produced by current field, and it has without dirt
The features such as dye, noiseless, little smokeless and useful space.The theoretical basiss of Electromagnetic Drive Technology are electromagnetic motion laws, electromagnetic energy
With light velocity propagation, as long as the electric current needed for having enough power to provide, sufficiently large electromagnetic force repulsion is produced as driving force.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the schematic diagram of the electromagnetic type actuating unit of reisilometer；
Wherein, 1 is elastic stem；2 is that elastic stem scales spring；3 is locating groove；4 is locating fastener；5 is push rod；6 are
Rule；7 is pointer segment；8 is pointer blocks；9 is pointer return pin；10 is elastic hammer；11 is motion block；12 is coil；13 is fixed
Block；14 is power supply；15 is voltmeter；16 is slide rail；17 is guide pillar；18 is trigger；19 is resiliometer casing；20 are push rod scaling
Spring；21 is handle.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The lossless reisilometer of a kind of Electromagnetic Drive, including the resiliometer casing 19, handle 21 and the gun barrel that are provided with cavity, cavity
Inside it is provided with and determines block 13 and motion block 11, motion block 11 is embedded with elastic hammer 10, front edge and the trigger 18 of motion block 11 fits；Determine block
The coil 12 being connected with power supply 14 is wound with 13；
Elastic stem 1 runs in the passage of launching an attack that gun barrel is opened up, and elastic stem scaling spring 2, attack are arranged with elastic stem 1
Bar 1 is also connected with the push rod 5 for going deep into cavity；
Rule 6 is additionally provided with gun body, rule 6 is provided with pointer segment 7 and pointer blocks 8, in its end pointer is additionally provided with
Return pin 9.
Before measurement, by the tested plane of the perpendicular contact of elastic stem 1, reisilometer is pressed to tested plane, makes attack by operator
Bar scaling spring 2 be in compressive state, elastic stem 1 under force can part indentation reisilometer, scaling spring 2 effect
It is lower to drive the transverse shifting to the right of push rod 5, promote elastic hammer 10 to be moved to the firing position specified and positioned by trigger 18 simultaneously, now
Motion block 11 and to determine between block 13 gap be setting value δ0.Connect DC source 16 and produce setting static equilibrium electric current, by determining block
Coil 12 on 13 is produced for the setting static electromagnetic repulsion of motion block 11 by electromagnetic induction.This is observed in real time by voltmeter 15
Voltage, to grasp electromagnetic repulsion force predetermined value is reached.
During measurement, cocking 18 makes elastic hammer 10 act on the slide rail 16 on lower edge guide pillar 17 in electromagnetic repulsion force and pushes
Bar 5 is moved along reisilometer cylinder, and when a certain position is moved to, elastic hammer 10 can contact with pointer segment 7 and be caused when designing
The length of pointer segment vertical direction projection is more than the distance between elastic hammer and resiliometer casing, and elastic hammer 10 drives pointer segment
7 cause pointer blocks 8 to return to zero-bit, and now pointer blocks 8 are limited and stop motion, and afterwards pointer segment 7 exists with the angle of housing 19
Under elastic hammer thrust can adjust automatically is pressurized diminishes, so the elastic hammer 10 for continuing to move can cross reisilometer pointer segment 7
So that pointer segment is on the right side of the big end of elastic hammer, and it can automatically become with the angle of housing and continue greatly to left movement, work as elastic hammer
10 touch after elastic stem 1, and elastic hammer 10 can rebound under force, and the motion block 11 ined succession in elastic hammer 10 overcomes determines block 13
Upper solenoid 12 produce electromagnetic repulsion force adverse movement, now pointer segment 7 can be stuck in the shaft shoulder on the right side of it and move therewith.
Meanwhile, the locating fastener 4 when elastic hammer 10 contacts elastic stem 1 positioned at the end of push rod 5 is just moved in locating groove, will be pushed away
Bar 5 is fixed, and such push rod would not be moved right together with elastic hammer, can prevent it from giving the thrust to the right of elastic hammer one, is entered
And affect the accuracy of measurement.So, the reading by reading pointer block 8 on rule 6 is obtaining the tested plane
Rebound value.
Complete to make elastic stem 1 leave tested plane after one-shot measurement, the elastic stem scaling spring 2 in compressive state is automatic
Equilbrium position is returned to, while driving the lateral movement to the left of elastic stem 1, the projection meeting of locating fastener 4 when setting position is moved to
Extruded by resiliometer casing 19 so as to depart from locating groove 3, push rod 5 stretches out elastic stem again under the thrust of scaling spring 2
1.The elastic hammer 10 for completing one-shot measurement rests on the left side of pointer segment 7, when being measured next time, in push rod 5 attack is driven
Pointer segment 7 can be moved right with elastic hammer 10 during hammer 10 is moved right, in this process, the motion block with the linkage of elastic hammer 10
11 reduce with the spacing for determining block 13, and electromagnetic repulsion force increases.In return pin thrust after pointer segment 7 touches pointer return pin 9
Under effect, it can reduce with the angle of resiliometer casing 19, therefore the elastic hammer 10 and motion block 11 of continuation motion can move to finger
The right side of faller gill 7, is to measure ready next time after elastic hammer 10 is positioned again by trigger 18.
Fig. 2 is the simplified model of the electromagnetic type actuating unit of reisilometer, is mainly made up of following several parts, is respectively 10
Elastic hammer；11 motion blocks；12 coils；13 determine block；14 power supplys；15 voltmeters；16 slide rails；17 guide pillars.
Here motion block 11 is armature, and it is electric magnet to determine block 13, the static equilibrium electricity by DC source 14 in coil 12
Stream, produces static electromagnetic repulsion and comes as electromagnetic spring power, elastic hammer 10 and connection motion block 11 is promoted together, along guide pillar 17
Slide rail 16 move.
The electromagnetic repulsion force of electromagnetic type reisilometer is the percussion force power source of the reisilometer, repulsion source when being again resilience, by
Electromagnetism gain knowledge the electromagnetic repulsion force of electric magnet is:
In formula, air permeability μ 0=0.4 π × 10-6, H/m；S for two magnetic poles of electric magnet the gross area, m2；δ0For quiet
Air gap during balance, m；N is the number of turn of magnet exciting coil；IN for magnet exciting coil magnetic potential, ampere-turn.When motion block 11 slides along guide pillar 17
When will produce Δ δ, the electromagnetic repulsion force f of electric magnet is the binary function of electric current i and δ when so dynamic, can be expressed as：
In formula, the instantaneous air gap between transient current and motion block when i and δ are dynamic in coil, quiet piece can be represented respectively
For:
I=I0+Δi (3a)
δ=δ0+Δδ (3b)
Current increment and air gap increment in formula, when Δ i, Δ δ represent respectively dynamic in coil；I0For initial current, δ0For
Initial air gap, when dynamic, the kinetics equation of motion block 11 is：
In formula, m1For jump bit and the gross mass of motion block.m1The weight that the use angle of jump bit that gcos θ represents is caused is mended
Repay.Known by formula (2), electromagnetic force f is the nonlinear function of exciting current i and air gap delta, when current increment Δ i and air gap increment
When Δ δ meets following relational expression：
| Δ i | ＜ ＜ I0 (5a)
| Δ δ | ＜ ＜ δ0 (5b)
Can be analyzed using linear theory, formula (3) is substituted into after formula (4), and wushu (3) is in static equilibrium point (I0,δ0) exhibition
It is as follows for Taylor series：
F (i, δ)=m1gcosθ+kiΔi-kδΔδ (6)
In formula：f(i0,δ0)=m1Gcos θ, because of the error that linearisation causes, will be by
Voltage control system is compensated.Formula (6) deformation just can obtain formula below：
m1Gcos θ-f (i, δ)=- k*Δδ (7)
In formula, k*For electromagnetic spring rigidity, can be expressed as：
k*=ki(kI-k0) (8)
Wherein：
Formula (7) is updated to formula (4), can obtain another expression-form of the kinetics equation of motion block 11：
In formula, k and x1The practical stiffness of electromagnetic spring and the absolute displacement of motion block are represented respectively.Will according to control when using
Ask and air gap increment Delta δ, keep current constant, the purpose of control electromagnetic spring rigidity is just can reach, so as to calculate measurement
Corresponding rebound height power, rebound value can correspond with the intensity of concrete material by experimental calibration, realize coagulation
The Non-Destructive Testing purpose of native intensity.
Example given above is to realize the present invention preferably example, the invention is not restricted to above-described embodiment.This area
Technical staff any nonessential addition, the replacement made according to the technical characteristic of technical solution of the present invention, belong to this
The protection domain of invention.
Claims (8)
1. the lossless reisilometer of a kind of Electromagnetic Drive, it is characterised in that including the resiliometer casing (19), the handle that are provided with cavity
(21) and gun barrel, it is provided with cavity and determines block (13) and motion block (11), motion block (11) is embedded with elastic hammer (10), before motion block (11)
End edge edge fits with trigger (18)；Determine to be wound with block (13) coil (12) being connected with power supply (14)；
Elastic stem (1) runs in the passage of launching an attack that gun barrel is opened up, and elastic stem scaling spring (2), bullet are arranged with elastic stem (1)
Hit bar (1) to be also connected with the push rod (5) for going deep into cavity；
Rule (6) is additionally provided with gun body, rule (6) is provided with pointer segment (7) and pointer blocks (8), is additionally provided with its end
Pointer return pin (9).
2. the lossless reisilometer of Electromagnetic Drive as claimed in claim 1, it is characterised in that described motion block (11) is by slide rail
(16) it is connected with guide pillar (17), after being driven by electromagnetic force or back pressure elastic force, can be movable along guide pillar (17)；Determine block (13)
Also it is fixedly connected with guide pillar (17).
3. the lossless reisilometer of Electromagnetic Drive as claimed in claim 1, it is characterised in that described block (13) of determining is electromagnetism
Ferrum, power supply (14) is arranged on cavity outside, and it is additionally provided with voltmeter (15) between coil (12)；
Motion block (11) is armature, determines to leave primary clearance δ between block (13) and motion block (11)0；
Block (13) is determined by the static equilibrium electric current in coil (12), generation static electromagnetic repulsion is pushed dynamic as electromagnetic spring
Block (11).
4. the lossless reisilometer of Electromagnetic Drive as claimed in claim 1, it is characterised in that described push rod (5) front end is provided with
Locating fastener (4), gun barrel is provided with the locating groove (3) matched with it；Push rod scaling spring is arranged with push rod (5)
(20)。
5. the lossless reisilometer of Electromagnetic Drive as claimed in claim 1, it is characterised in that pointer segment (7) vertical direction
The length of projection is more than the distance between elastic hammer (10) and resiliometer casing (19).
6. the measuring method of the lossless reisilometer of Electromagnetic Drive described in a kind of claim 1, it is characterised in that including following behaviour
Make：
Before measurement, lossless reisilometer is pressed to tested plane by the tested plane of elastic stem (1) perpendicular contact, makes elastic stem scale bullet
Spring (2) drives push rod (5) laterally to move inwards in compressive state, elastic stem (1) part indentation reisilometer in scaling spring (2)
It is dynamic, promote elastic hammer (10) to be moved to the firing position specified simultaneously by trigger (18) positioning, now motion block (11) and determine block
(13) gap is setting value δ between0；Coil (12) is connected with DC source (14), determines the coil (12) on block (13) by electromagnetism
Sensing is produced for the setting static electromagnetic repulsion of motion block (11), while observing real-time voltage by voltmeter (15)；
During measurement, cocking (18), elastic hammer (10) pushes push rod (5) movement under electromagnetic repulsion force effect, in moving process
Middle elastic hammer (10) can contact with pointer segment (7), and elastic hammer (10) drives pointer segment (7) to cause pointer blocks (8) to return to zero-bit,
Now pointer blocks (8) are limited and stop motion, and the elastic hammer (10) for continuing to move afterwards crosses reisilometer pointer segment (7) continuation
To left movement, after elastic hammer (10) touches elastic stem (1), elastic hammer (10) rebounds under force, in elastic hammer
(10) motion block (11) ined succession overcomes the electromagnetic repulsion force adverse movement for determining that solenoid (12) is produced on block (13), now pointer segment
(7) shaft shoulder that can be stuck in rear side is moved therewith；
When elastic hammer (10) contacts elastic stem (1), the locating fastener (4) positioned at push rod (5) end just moves to locator card
Groove (3) is inner, and push rod (5) is fixed；The tested plane is obtained by reading of the reading pointer block (8) on rule (6)
Rebound value.
7. the measuring method of the lossless reisilometer of Electromagnetic Drive as claimed in claim 6, it is characterised in that complete one-shot measurement
Afterwards, elastic stem (1) is made to leave tested plane, elastic stem scaling spring (2) in compressive state automatically returns to equilbrium position, together
When drive elastic stem (1) lateral movement to the left, when setting position is moved to, locating fastener (4) projection can be subject to reisilometer shell
The extruding of body (19) so as to depart from locating groove (3), push rod (5) stretches out attack again under the thrust of elastic stem scaling spring (2)
Bar (1)；
The elastic hammer (10) for completing one-shot measurement rests on the left side of pointer segment (7), when being measured next time, in push rod (5)
Pointer segment (7) can be moved right with elastic hammer (10) during driving elastic hammer (10) to move right, in this process, with attack
The motion block (11) of hammer (10) linkage reduces with the spacing for determining block (13), and electromagnetic repulsion force increases；
After pointer segment (7) touches pointer return pin (9) in the presence of return pin thrust, continue the elastic hammer (10) for moving
It is next time after elastic hammer (10) is positioned again by trigger (18) with the right side that motion block (11) can move to pointer segment (7)
Measurement is ready.
8. the measuring method of the lossless reisilometer of Electromagnetic Drive as claimed in claim 6, it is characterised in that by motion block (11)
Dynamics Controlling is controlling electromagnetic spring rigidity；
The kinetics equation of motion block (11) is：
In formula, m1For jump bit and the gross mass of motion block；
And following formula is obtained by voltage controling compensation：
m1Gcos θ-f (i, δ)=- k*△δ (7)
In formula, k*For electromagnetic spring rigidity, k*=ki(kI-k0) (8)
Wherein：
Formula (7) is updated to formula (4), can obtain motion block 11 kinetics equation, second expression-form：
In formula, k and x1The practical stiffness of electromagnetic spring and the absolute displacement of motion block are represented respectively；When using according to control require with
And air gap increment △ δ, current constant is kept, to control electromagnetic spring rigidity.
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| CN201611252671.2A CN106679912B (en) | 2016-12-30 | 2016-12-30 | A kind of lossless reisilometer and measurement method of electromagnetic drive |
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| CN201611252671.2A CN106679912B (en) | 2016-12-30 | 2016-12-30 | A kind of lossless reisilometer and measurement method of electromagnetic drive |
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| CN106679912B CN106679912B (en) | 2019-11-12 |
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| CN113109198A (en) * | 2021-04-12 | 2021-07-13 | 长江水利委员会长江科学院 | Artificial intelligent hammer for testing rock hardness degree and construction method thereof |
| CN113654930A (en) * | 2021-09-06 | 2021-11-16 | 中国化学工程第三建设有限公司 | Electromagnetic power mortar resiliometer device |
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| CN110141504A (en) * | 2019-03-29 | 2019-08-20 | 重庆市中医院 | A kind of automation fire needle and autocontrol method that multi-parameter is controllable |
| CN110141504B (en) * | 2019-03-29 | 2024-01-09 | 重庆市中医院 | Multi-parameter controllable automatic fire needle and automatic control method |
| CN110470410A (en) * | 2019-09-24 | 2019-11-19 | 王戗戗 | A kind of heat-sensitive sensor |
| CN112847228B (en) * | 2021-01-08 | 2022-11-15 | 奇瑞汽车河南有限公司 | Automobile driving nut locking tool and using method thereof |
| CN112847228A (en) * | 2021-01-08 | 2021-05-28 | 奇瑞汽车河南有限公司 | Automobile driving nut locking tool and using method thereof |
| CN113109198A (en) * | 2021-04-12 | 2021-07-13 | 长江水利委员会长江科学院 | Artificial intelligent hammer for testing rock hardness degree and construction method thereof |
| CN113654930A (en) * | 2021-09-06 | 2021-11-16 | 中国化学工程第三建设有限公司 | Electromagnetic power mortar resiliometer device |
| CN113654930B (en) * | 2021-09-06 | 2023-06-09 | 中国化学工程第三建设有限公司 | Electromagnetic power mortar resiliometer device |
| CN116559002A (en) * | 2023-06-27 | 2023-08-08 | 慈溪市诚正建设工程检测有限公司 | Concrete strength detection device |
| CN116559002B (en) * | 2023-06-27 | 2023-11-07 | 慈溪市诚正建设工程检测有限公司 | Concrete strength detection device |
| CN116878789A (en) * | 2023-09-07 | 2023-10-13 | 南通恒立机械设备有限公司 | Rigidity testing device for large-batch springs |
| CN116878789B (en) * | 2023-09-07 | 2023-12-12 | 南通恒立机械设备有限公司 | Rigidity testing device for large-batch springs |
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Effective date of registration: 20210628 Address after: Room 301-113, building 2, xiexinggang, Hongguang Avenue, Fengdong new town, Xi'an, Shaanxi 710000 Patentee after: XI'AN BEYOND INTELLIGENCE TECHNIQUE Co.,Ltd. Address before: 710064 middle section, south two ring road, Shaanxi, Xi'an Patentee before: CHANG'AN University |