CN104713784A - B-type hydraulic universal tester - Google Patents
B-type hydraulic universal tester Download PDFInfo
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- CN104713784A CN104713784A CN201310674567.2A CN201310674567A CN104713784A CN 104713784 A CN104713784 A CN 104713784A CN 201310674567 A CN201310674567 A CN 201310674567A CN 104713784 A CN104713784 A CN 104713784A
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Abstract
The invention discloses a B-type hydraulic universal tester, comprising a base, a main cylinder, a main cylinder piston, a testing bench, a lower beam and an upper beam, wherein the main cylinder is arranged inside the base; the main cylinder piston is arranged inside the main cylinder; the testing bench is connected to the upper end of the main cylinder piston; the lower beam is arranged above the testing bench; the upper beam is arranged above the lower beam; upright posts are respectively arranged at two ends of the base, and pass through the lower beam; the upper ends of the upright posts are arranged inside guide holes at two ends of the upper beam; the testing bench is connected with the upper beam through a polish rod; clamps are respectively arranged at the middle position of the upper part of the upper beam and the middle position of the lower part of the lower beam; lifting cylinders are also arranged at two ends of the base; lifting cylinder piston rods are arranged inside the lifting cylinders, and connected with the lower beam; lock cylinders are arranged at two ends of the lower beam; the upright posts pass through the lock cylinders. The B-type hydraulic universal tester has the advantages that mechanical impact is removed, and the reliability and the stability of the tester, and the accuracy and the consistency of the measurement result are improved.
Description
Technical field
The invention belongs to Material Testing Machine technical field, relate to a kind of Type B universal hydraulic testing machine tested for various material mechanical performance.
Background technology
Universal testing machine is the equipment tested for various material mechanical performance.The basic mechanical performance index of material can be obtained, as yield strength, tensile strength, length growth rate, elastic modulus etc. by tests such as stretching, compressions.
The tension test of material is a kind of destructive test, tested sample usually break by test force.For high-strength material, such as metal, its test force is usually comparatively large, and common range of test force can reach 3000kN.In sample disrumpent feelings moment, the elastic potential energy that the pressure potential that in testing machine frame, pressure circuit, pressure oil and master cylinder pressure oil store, sample accumulate in process of the test will discharge suddenly.If testing machine frame exists structural gap, then can cause strong physical shock, produce strong pulsed noise and vibrations, mechanical component are easily out of shape and even rupture, and equipment easily breaks down.Simultaneously strong impact noise, when not having sound arrester, causes interference and harm can to operating personnel and other neighbouring staff.
A kind of universal hydraulic testing machine being called as Type B machine uses very general at present.As shown in Figure 1 to Figure 3, following main parts size is comprised: base 1, screw mandrel set nut 2, screw mandrel 3, thrust bearing 4, master cylinder 5, master cylinder plunger 6, load sensor 7, test stand 8, feed screw nut 9, spring anti-backlash mechanism 10, sill 11, dustproof shade 12, entablature 13, hydraulic wedge clamp 14, polished rod 15, travel switch position-limit mechanism 17, reductor 18, chain tractor 19.
Type B machine is a kind of oil cylinder underneath type Double space tester.Upper space is stretching space, and lower space is compression, the curved space.Test space size is changed by the height and position adjusting sill 11.Sill 11 is transformed into the rectilinear motion of above-below direction by the helical motion of leading screw 3 and feed screw nut 9.Once after test space adjusts, it is highly motionless that namely sill 11 is parked in certain of screw mandrel 3.Entablature 13 is linked together by 4 polished rods 15 and test stand 8, and test stand 8 is linked together by load sensor 7 and master cylinder plunger 6 again.Entablature 13 and sill 11 are all with the hydraulic wedge clamp 14 arranged in opposite directions.Upper lower clamp hydraulic wedge clamp 14 clamps sample 16 simultaneously.After master cylinder 5 passes into pressure oil, master cylinder plunger 6 promotes test stand 8, polished rod 15, entablature 13 move up together, make sample 16 bear tensile force, until sample 16 is pulled off.
Mainly there is following deficiency and potential risk in existing Type B Double space tester:
Because leading screw 3 and feed screw nut 9 are relations of rotary motion pair, therefore gap must be there is between leading screw 3 and feed screw nut 9.On sill 11 top, respectively there is a set of spring anti-backlash mechanism 10 coaxial with feed screw nut 9 left and right, this mechanism can overcome the deadweight of sill 11, and elimination feed screw nut 9 in the gap in tensile force direction, makes the power displacement curve in process of the test there is not step phenomenon with leading screw 3.But spring anti-backlash mechanism 10 can only towards direction of pull effect, and gap can not be eliminated in the direction contrary with pulling force.In sample 16 disrumpent feelings moment, the opposite direction towards pulling force is impacted by sill 11.Because have gap in the other direction, the physical shock between feed screw nut 9 and screw mandrel 3 therefore must be caused.This impact not only can cause the damage of feed screw nut 9, screw mandrel 3 screw thread, also can cause physical shock noise.In addition on the one hand, because feed screw nut 9 is fixed on sill 11, can not rotate, therefore must be realized the motion of revolute by rotational lead screw 3.Meanwhile, in rotation process, there is mechanical wear, cause rotational resistance to increase in feed screw nut 9 and screw mandrel 3.In addition, because the wearing and tearing of screw thread rotation pair, the radial location precision of sill 11 can significantly reduce, and this directly reduces the right alignment of testing machine, thus reduces test result accuracy.For preventing external dust, burning skin etc. from entering feed screw nut 9 inside, in screw mandrel 3 outside, telescopic sealed preventing dust curtain 12 is installed.Although dustproof shade can stop external dust, burning skin etc. to enter feed screw nut 9 inside, also hamper simultaneously and add lubricating oil to feed screw nut 9.Therefore necessary maintenance often can not get performing, and produces dry friction, cause the damage of leading screw 3 and feed screw nut 9 further when this causes screw mandrel screw pair to be moved, and increases rotational resistance.Screw mandrel 3 lower end and base 1 are linked together by thrust bearing 4 and set nut 2.Because leading screw 3 rotates in the installation through hole of base 1, therefore there is end play and radial play between screw mandrel 3 and base 1, in rotation process, inevitably produce wearing and tearing, increase frictional resistance.
Because there is above-mentioned many drawbacks, therefore drag in screw mandrel 3 rotation process in chain tractor 19, the faults such as often occurring that screw mandrel 3 is stuck can not rotate, and chain is elongated, reductor 18 damage.When serious, screw mandrel generation permanent bending is out of shape, and screw mandrel thread damages, and feed screw nut 9 cannot exit from screw mandrel 3, must cut off screw mandrel 3 during maintenance, the screw mandrel 3 again more renewed and supporting feed screw nut 9.This equipment failure once occur, then must cause great economic loss.
For the Type B universal hydraulic testing machine widely used at present, also there is the defect that another one is great.Its master cylinder 5 is plunger type one-way cylinders, master cylinder plunger 6 be its deadweight and test stand 8, polished rod 15, entablature 13 Action of Gravity Field under reset.The stroke that stretches out of master cylinder plunger 6 relies on complicated travel switch position-limit mechanism 17 to limit.But, when large load test, because testing machine frame and hydraulic system have put aside very large potential energy, once sample 16 is pulled off, the phenomenon that the parts be made up of entablature 13, polished rod 15, test stand 8, master cylinder plunger 6 there will be " upper jumping ", this " upper jumping " often causes position-limit mechanism 17 to be damaged, thus loses spacing function, if fault fails to be discharged in time, master cylinder plunger 6 may be there is by the situation of pressure oil ejection cylinder 5.
Summary of the invention
For this reason, technical matters to be solved by this invention is to provide a kind of elimination physical shock, improves testing machine reliability, stability, measurement result accuracy, conforming Type B universal hydraulic testing machine, overcomes the deficiency that prior art exists.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of Type B universal hydraulic testing machine, it comprises base, be provided with the master cylinder in base, the main oil cylinder piston be located in master cylinder, be connected to the test stand of main oil cylinder piston upper end, the entablature being positioned at the sill above test stand and being positioned at above sill, described base two ends are respectively equipped with column, described column is through described sill, its upper end is positioned at the pilot hole at entablature two ends, described test stand is connected with described entablature by polished rod, and described entablature upper middle position and described sill lower middle position have fixture respectively; It is characterized in that: on described base, two ends are also provided with hoist cylinder, be provided with hoist cylinder piston rod in described hoist cylinder, described hoist cylinder piston rod is connected with sill; Described sill two ends are provided with locking cylinder, and described column is through described locking cylinder.
Described locking cylinder comprises cylinder body and the inner cone hollow piston be located in cylinder body and the deformable external conical sleeve of locking described column by the effect of described inner cone hollow piston.
In a specific embodiment, described cylinder body has the ladder axis hole that upper shaft hole is large, lower shaft hole is little, and described inner cone hollow piston is followed successively by guidance part, piston portion and enforcement division from top to bottom; The endoporus of guidance part and piston portion on the same face of cylinder, the circumference contact of itself and column; The endoporus of described enforcement division is taper surface, and outer peripheral face is the face of cylinder, and the diameter of the outer peripheral face of enforcement division is greater than the outer peripheral face diameter of guidance part, and the outer peripheral face of piston portion is greater than the diameter of the outer peripheral face of enforcement division; Described cylinder body upper end open is stamped locking cylinder end cap; In the guiding gap that the guidance part of described inner cone hollow piston is formed between column and locking cylinder end cap; Described piston region is in the upper shaft hole of cylinder body, and enforcement division is arranged in the lower shaft hole of cylinder body; The half section of described deformable external conical sleeve is " L " type structure, and it is made up of shaft sleeve part and end plate, and the endoporus of described shaft sleeve part is the face of cylinder, the conical surface that outer peripheral face is consistent with the hole taper of the enforcement division of inner cone hollow piston; Described shaft sleeve part is inserted in the enforcement division of inner cone hollow piston and the gap of column, and the endoporus of shaft sleeve part contacts with column, the mutual cone match of the conical surface of the conical surface of the enforcement division of inner cone hollow piston and the shaft sleeve part of deformable external conical sleeve; Described end plate blocks cylinder body lower ending opening.
The upper end of described master cylinder has master cylinder end cap, (" rod chamber " refers to that cavity volume at piston rod place to form rod chamber between described master cylinder end cap and the piston portion of main oil cylinder piston, there is no that cavity volume of piston rod " rodless cavity "), the oil inlet pipe of described rod chamber is provided with surplus valve.
Described locking cylinder has 4, is distributed in sill two ends upper-lower position.
Two described hoist cylinders are diagonally arranged on described base in position, with master cylinder Central Symmetry.
Also include security protection and noise insulation device, described security protection and noise insulation device and described test stand and described entablature form closed test space jointly.
Adopt technique scheme, this Type B universal hydraulic testing machine of the present invention has series of advantages such as eliminating physical shock, raising testing machine reliability, stability, measurement result accuracy, consistance.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:
Fig. 1 is the structural representation of the Type B universal hydraulic testing machine of prior art;
Fig. 2 is the side view of Fig. 1;
Fig. 3 be in Fig. 1 A-A to cut-open view;
Fig. 4 is the structural representation of Type B universal hydraulic testing machine of the present invention;
Fig. 5 is the side view of Fig. 4;
Fig. 6 is the front appearance schematic diagram of Fig. 4;
Fig. 7 be in Fig. 4 A-A to cut-open view;
Fig. 8 be in Fig. 4 B-B to cut-open view;
Fig. 9 is D place enlarged diagram in Fig. 4.
Embodiment
As shown in Fig. 4-Fig. 8, Fig. 4 be in Fig. 6 C-C to internal view.The main parts size of Type B universal hydraulic testing machine of the present invention has: base 25, master cylinder 26, main oil cylinder piston 27, column 28, column set nut 29, master cylinder end cap 30, load sensor 31, test stand 32, locking cylinder oil pipe 33, security protection and noise insulation device 34, locking cylinder 35, sill 36, entablature 37, hydraulic wedge clamp 38, polished rod 39, hoist cylinder piston rod 40, hoist cylinder 41, interior coaming plate 42, squab panel 43, front panel 44, oil pipe and Splices cable module 45, fixture oil pipe 46.
Wherein, base 25 center has a through hole, and master cylinder 26 interts in this center pit, forms radial location, plane axial location on master cylinder 26 outer ring shoulder and base 25, and is fixed on base 25 by master cylinder 26 with screw.Two root posts 28 inject in the through hole of base 25 two ends respectively, plane axial location on the shoulder of column 28 lower end and base 25, and are fixed on base 25 by column 28 with column set nut 29 and some screws.Main oil cylinder piston 27 inserts in master cylinder 26 inner chamber, and master cylinder end cap 30 is arranged on master cylinder 26 upper end, the range of restriction main oil cylinder piston 27, and forms rod chamber with the piston portion of master cylinder 26 and main oil cylinder piston 27.Main oil cylinder piston 27 stretches out from master cylinder end cap, and test stand 32 and main oil cylinder piston 27 link together by load sensor 31.Entablature 37 and test stand 32 link together by polished rod 39 two ends screw.Therefore, when master cylinder rodless cavity injection pressure oil, main oil cylinder piston 27 raises, and promotion test stand 32, polished rod 39, entablature 37 move upward.Entablature 37 two ends are processed with 2 pilot holes, and this pilot hole is blind hole, and column 28 upper end is arranged in blind hole, and blind hole and column 28 upper end form guiding relation.Entablature 37 middle lower portion has semi-open type Wedge gripping die cavity, and hydraulic wedge clamp 38 is arranged in this semi-open type Wedge gripping die cavity.Sill 36 is positioned at the below of entablature 37, and sill 36 middle upper portion has semi-open type Wedge gripping die cavity, and another hydraulic wedge clamp 38 is arranged in semi-open type Wedge gripping die cavity.Sill 36 two ends are processed with 4 up and down for assembling the die cavity of locking cylinder 35 simultaneously, and one end respectively has a die cavity up and down.Two ends die cavity centre distance is equal with two column 28 centre distances, and upper lower impressions is coaxial.Like this, above base 25, test stand 32, sill 36, entablature 37 is followed successively by.Form compression test space between sill 36 and test stand 32, between sill 36 and entablature 37, form tension test space.Security protection and noise insulation device 34 form with test stand 32 and entablature 37 test space closed jointly.Two hoist cylinders 41 are diagonally arranged on base 25 in position, with master cylinder 26 Central Symmetry.Hoist cylinder piston rod 40, through the supporting through hole in test stand 32, links together with sill 36.When hoist cylinder 41 passes into pressure oil, hoist cylinder piston rod 40 stretches out or retracts, thus promotion sill 36 raises or reduces.After adjusting sill 36 position, pressure oil passes in locking cylinder 35 by locking cylinder oil pipe 33, makes locking cylinder lock or unclamp.Locking cylinder 35 is linked together by screw 57 and sill, and fixing axial location is motionless.
As shown in Figure 9, the die cavity in assembling locking cylinder 35 is ladder die cavity, and locking cylinder 35 is just arranged in ladder die cavity.
Locking cylinder 35 is made up of following part: locking cylinder end cap 47, O-ring seal 48, cylinder body 49, O-ring seal 50, inner cone hollow piston 51, O-ring seal 52, deformable external conical sleeve 53, O-ring seal 54.
Wherein, cylinder body 49 has the ladder axis hole that upper shaft hole is large, lower shaft hole is little, inner cone hollow piston 51 is followed successively by guidance part 511, piston portion 512 and enforcement division 513 from top to bottom, the endoporus of guidance part 511 and piston portion 512 is on the same face of cylinder, the circumference contact of itself and column 28, the endoporus of enforcement division 513 is taper surface, outer peripheral face is the face of cylinder, and the diameter of the outer peripheral face of enforcement division 513 is greater than the outer peripheral face diameter of guidance part 511, the outer peripheral face of piston portion 512 is greater than the diameter of the outer peripheral face of enforcement division 513.In the guiding gap that the guidance part of inner cone hollow piston 51 is formed between column 28 and locking cylinder end cap 47, piston portion 512 is arranged in the upper shaft hole of cylinder body 49, and enforcement division 513 is arranged in the lower shaft hole of cylinder body 49.The half section of deformable external conical sleeve 53 is " L " type structure, and it is made up of shaft sleeve part 531 and end plate 532, and the endoporus of shaft sleeve part 531 is the face of cylinder, the conical surface that outer peripheral face is consistent with the hole taper of the enforcement division 513 of inner cone hollow piston 51.Shaft sleeve part 531 inserts the enforcement division 513 of inner cone hollow piston 51 with the gap of column 28, the endoporus of shaft sleeve part 531 contacts with column, the conical surface of the conical surface of the enforcement division 513 of inner cone hollow piston 51 and the shaft sleeve part 531 of deformable external conical sleeve 53 contacts with each other, mutual cone match.End plate 532 blocks cylinder body 49 lower ending opening.O-ring seal 54 is provided with between the outer circumference surface and the endoporus of locking cylinder end cap 47 of the guidance part of inner cone hollow piston 51, O-ring seal 48 is provided with between locking cylinder end cap 47 and cylinder body 49, be provided with O-ring seal 50 between the outer circumference surface of the piston portion of inner cone hollow piston 51 and cylinder body 49, between the outer circumference surface of the enforcement division of inner cone hollow piston 51 and cylinder body 49, be provided with O-ring seal 52.
Like this, locking oil pocket 55 is jointly formed by locking cylinder end cap 47, O-ring seal 48, cylinder body 49, O-ring seal 50, inner cone hollow piston 51, O-ring seal 54.Jointly be made up of cylinder body 49, O-ring seal 50, inner cone hollow piston 51, O-ring seal 52 and unclamp oil pocket 56.Inner cone hollow piston 51 and deformable external conical sleeve 53 form cone match.When locking oil pocket 55 and passing into high-pressure oil, the axial thrust of inner cone hollow piston 51 is applied on deformable external conical sleeve 53 conical surface, and axial force is similar to the normal pressure converting the conical surface according to tapering inverse proportion to.Conical surface normal pressure is delivered on the face of cylinder of column 28 by deformable external conical sleeve 53, forms the normal pressure acted on the face of cylinder, and the product of this normal pressure and friction factor is the load axially can born.The tapering of the conical surface is 1:6 ~ 1:10, and the pressure limit of locking oil pocket is 45MPa ~ 60MPa.According to theory calculate, bearing safety coefficient reaches more than 2.Deformable external conical sleeve 53 circumferentially evenly has some axial notch, and make it when bearing conical surface pressure, central through hole variable diameter is little, after conical surface normal pressure is eliminated, can recover green diameter.When unclamping after oil pocket 56 passes into pressure oil, the inner conical surface of inner cone hollow piston 51 and the male cone (strobilus masculinus) of deformable external conical sleeve 53 are thrown off, and deformable external conical sleeve 53 endoporus recovers green diameter, and the coupling mechanism force of column 28 disappears.Now sill 36 can be lifting cylinder piston rod 40 and raises or reduce.
Be exactly more than Type B universal hydraulic testing machine of the present invention, this has abandoned the thought of chain tractor that traditional experiment machine adopts and lead screw transmission mechanism, have employed more advanced reliable hydraulic locking and hydraulic lifting technology.Under locking state, testing machine framework for support, without any gap, can bear forward test force, also can bear sample disrumpent feelings time reverse impact power, testing machine does not have the impact between mechanical component.Have employed hydraulic lifting, steadily, speed is stepless adjustable, and centralized positioning precision is higher in sill lifting.Simultaneously, because have employed the master cylinder of double acting structure, and the oil inlet pipe of rod chamber and high-speed response surplus valve UNICOM, controlled jam pot cover at the disrumpent feelings rear rod chamber of sample to block up, form a closed cavity volume, the hydraulic oil in cavity volume stops piston to continue to move upward, meanwhile, may produce the pressure pulse of a moment in this cavity volume, pressure pulse by the pressure release of high speed surplus valve, thus plays buffer action; Phenomenon that sample is disrumpent feelings be there will not be instantaneously " upper jumping ".Owing to not needing extra position-limit mechanism and other mechanical transmission mechanisms, the failure rate of equipment can significantly reduce.Plant maintenance also becomes simpler.And the impulsive noise that security protection and sound arrester produce when sample itself can be ruptured shields in the interval closed, noise can not cause interference and harm to operator and periphery personnel.
In a word, no matter testing machine of the present invention is the reliability from testing machine itself, the accuracy of stability, measurement result, consistance, or from ergonomics angle, is all have significant technical progress.
Claims (8)
1. a Type B universal hydraulic testing machine, it comprises base, be provided with the master cylinder in base, the main oil cylinder piston be located in master cylinder, be connected to the test stand of main oil cylinder piston upper end, the entablature being positioned at the sill above test stand and being positioned at above sill, described base two ends are respectively equipped with column, described column is through described sill, its upper end is positioned at the pilot hole at entablature two ends, described test stand is connected with described entablature by polished rod, and described entablature upper middle position and described sill lower middle position have fixture respectively; It is characterized in that: on described base, two ends are also provided with hoist cylinder, be provided with hoist cylinder piston rod in described hoist cylinder, described hoist cylinder piston rod is connected with sill; Described sill two ends are provided with locking cylinder, and described column is through described locking cylinder.
2. Type B universal hydraulic testing machine according to claim 1, is characterized in that: described locking cylinder comprises cylinder body and the inner cone hollow piston be located in cylinder body and the deformable external conical sleeve of locking described column by the effect of described inner cone hollow piston.
3. Type B universal hydraulic testing machine according to claim 2, is characterized in that: described cylinder body has the ladder axis hole that upper shaft hole is large, lower shaft hole is little, and described inner cone hollow piston is followed successively by guidance part, piston portion and enforcement division from top to bottom; The endoporus of guidance part and piston portion on the same face of cylinder, the circumference contact of itself and column; The endoporus of described enforcement division is taper surface, and outer peripheral face is the face of cylinder, and the diameter of the outer peripheral face of enforcement division is greater than the outer peripheral face diameter of guidance part, and the outer peripheral face of piston portion is greater than the diameter of the outer peripheral face of enforcement division; Described cylinder body upper end open is stamped locking cylinder end cap; In the guiding gap that the guidance part of described inner cone hollow piston is formed between column and locking cylinder end cap; Described piston region is in the upper shaft hole of cylinder body, and enforcement division is arranged in the lower shaft hole of cylinder body; The half section of described deformable external conical sleeve is " L " type structure, and it is made up of shaft sleeve part and end plate, and the endoporus of described shaft sleeve part is the face of cylinder, the conical surface that outer peripheral face is consistent with the hole taper of the enforcement division of inner cone hollow piston; Described shaft sleeve part is inserted in the enforcement division of inner cone hollow piston and the gap of column, and the endoporus of shaft sleeve part contacts with column, the mutual cone match of the conical surface of the conical surface of the enforcement division of inner cone hollow piston and the shaft sleeve part of deformable external conical sleeve; Described end plate blocks cylinder body lower ending opening.
4. Type B universal hydraulic testing machine according to claim 3, is characterized in that: described deformable external conical sleeve circumferentially uniform intervals distribution axial notch.
5. the Type B universal hydraulic testing machine according to the arbitrary claim of Claims 1-4, it is characterized in that: the upper end of described master cylinder has master cylinder end cap, form rod chamber between described master cylinder end cap and the piston portion of main oil cylinder piston, the oil inlet pipe of described rod chamber is provided with surplus valve.
6. the Type B universal hydraulic testing machine according to the arbitrary claim of Claims 1-4, is characterized in that: described locking cylinder has 4, is distributed in sill two ends upper-lower position.
7. Type B universal hydraulic testing machine according to claim 1, is characterized in that: two described hoist cylinders are diagonally arranged on described base in position, with master cylinder Central Symmetry.
8. Type B universal hydraulic testing machine according to claim 1, is characterized in that: also include security protection and noise insulation device, and described security protection and noise insulation device and described test stand and described entablature form closed test space jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310674567.2A CN104713784A (en) | 2013-12-11 | 2013-12-11 | B-type hydraulic universal tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310674567.2A CN104713784A (en) | 2013-12-11 | 2013-12-11 | B-type hydraulic universal tester |
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| CN104713784A true CN104713784A (en) | 2015-06-17 |
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| CN201310674567.2A Pending CN104713784A (en) | 2013-12-11 | 2013-12-11 | B-type hydraulic universal tester |
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| CN109115593A (en) * | 2018-08-31 | 2019-01-01 | 中国兵器工业第五九研究所 | Marine climate environment-tensile, compressive, bending load coupling test equipment and test method |
| CN109406309A (en) * | 2018-08-22 | 2019-03-01 | 芜湖市黄山松工业地坪新材料有限公司 | Detection device is used in a kind of processing of construction material |
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| CN109406309A (en) * | 2018-08-22 | 2019-03-01 | 芜湖市黄山松工业地坪新材料有限公司 | Detection device is used in a kind of processing of construction material |
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Application publication date: 20150617 |
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