CN109139665A - High strength alumin ium alloy pre-buried channel flow component and pre-buried channel flow moulding process - Google Patents
High strength alumin ium alloy pre-buried channel flow component and pre-buried channel flow moulding process Download PDFInfo
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- CN109139665A CN109139665A CN201811025494.3A CN201811025494A CN109139665A CN 109139665 A CN109139665 A CN 109139665A CN 201811025494 A CN201811025494 A CN 201811025494A CN 109139665 A CN109139665 A CN 109139665A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 23
- 238000000465 moulding Methods 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims abstract description 3
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 235000010210 aluminium Nutrition 0.000 claims description 5
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 239000000956 alloy Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 150000003585 thioureas Chemical class 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
Abstract
The invention discloses a kind of high strength alumin ium alloy pre-buried channel flow component, including pre-buried channel flow and tommyhead bolt, pre-buried channel flow is made of C-channel with the anchor pole for being fixed on the C-channel slot bottom back side；Anchor pole and C-channel are the integral structure of formed by extrusion and tension, and the notch of C-channel is two in-flanges structures for being symmetrical with C-channel middle line, two in-flanges it is opposite be on one side rack structure；The bolt head of tommyhead bolt is made of the first cuboid and the second cuboid, and the second cuboid is mutually connected with the shank of bolt of tommyhead bolt；The width of first cuboid and the second cuboid is equal, respectively less than the width of rebate of C-channel；The length of first cuboid is greater than the width of rebate of C-channel, offers the engaging tooth being meshed with corresponding rack gear respectively on two width profiles of the second cuboid.The invention has the advantages that improving the intensity and weight bearing power of pre-buried channel flow, high-strength aluminum alloy material density is small, and consumable material is few under same load, improves teeth resistant slide ability.
Description
Technical field
The present invention relates to comprehensive pipelines in electromechanics installation industry to support field, more particularly, to high strength alumin ium alloy pre-buried channel flow
Component and pre-buried channel flow moulding process.
Background technique
In infrastructure project, pre-buried channel flow technology is more and more used, i.e., is poured at the scene, prefabricated reinforced concrete
Preceding implantation pre-buried channel flow, and replace expansion bolt to fix suspended tubes in any inclined surface and arc-shaped surface with tommyhead bolt cooperation
The products such as line.
Existing pre-buried channel flow is a kind of hot rolled strip tooth C-shaped channel, as figs 11-13, C-shaped channel ontology 1.1 with
The anchor pole 1.2 at the back side is separate machined, and more anchor poles 1.2 are connect by rivet or weld with conduit ontology 1.1.Due to weld part
Position generates stress raisers, causes 1.1 welding position of C-shaped channel ontology to deform, concrete can leak into C-shaped channel when pre-buried
Inside influences pre-buried effect.Cold pressing riveting is plastically deformed the end of anchor pole 1.2 by pressurization, forms biggish office
Portion's raised step, influences product appearance and anchor pole 1.2 and 1.1 contact area of conduit ontology are small, and inside presses a peripheral thickness not
Uniformly, the fixation of anchor pole 1.2 is unstable.
As shown in Figure 15 .1,15.2, C-shaped channel ontology 1.1 generallys use the processing of Q235 hot-rolled steel 1.3, and moulding process is
Tooth form rolling is carried out on the two sides of hot rolled strip 1.3 edge by hobbing machine 1.4 first, C is then rolled by roll unit
Shape conduit ontology 1.1；As shown in Figure 11, Figure 12, the engaging tooth 1.5 that C-shaped channel ontology 1.1 is meshed with tommyhead bolt is located at C-shaped
Inside the C-channel of conduit ontology 1.1, it has not been convenient to teeth detection；And since the two sides of hot-rolled steel 1.3 are along there are irregular
Property, so that it is lack of standardization to roll out 1.5 tooth form of engaging tooth come, width and depth is smaller, teeth profile is unintelligible, especially in heat
Occur corner as shown in figure 14 after zinc-plated and deposit 1.6 phenomenons, influences normally to engage, teeth resistant slide ability is lower, in work
There is teeth stress overloading, sliding phenomenon in journey installation or normal course of operation, leads to the generation of collapse accident.
In terms of surface anticorrosive processing, existing C-shaped channel ontology 1.1 generallys use the processing of Q235 hot rolled strip 1.3, carbon
Steel material itself does not have corrosion proof function, and corrosion proof function depends on the thickness and quality of surface hot galvanized layer, hot galvanizing
For technique itself there are many defects, workpiece surface leaves list edge, cadmia, and Several Thiourea Derivatives on Zinc Plate Surface be easy to appear fish scale,
Blistering, white dot, destroy surface anticorrosion layer, shorten its service life；The process environments are seriously polluted simultaneously, generation
Spent lye, acid pickle, pernicious gas etc. cause environmental pollution.
Therefore, how improved by reasonable selection and structure to promote product strength and performance, both can guarantee anti-
Sliding ability improves weight bearing power, and can guarantee that the pre-buried channel flow that antiseptic property is excellent, free from environmental pollution, the cost of material is low produces
Product have important practical significance.
Summary of the invention
It is an object of that present invention to provide a kind of high strength alumin ium alloy pre-buried channel flow components, and it is pre- that another object of the present invention is to provide this
Bury the pre-buried channel flow moulding process in conduit component.
To achieve the above object, the present invention takes following technical proposals:
High strength alumin ium alloy pre-buried channel flow component of the present invention, including pre-buried channel flow and setting are in the pre-buried channel flow groove
Tommyhead bolt, the pre-buried channel flow is by C-channel and is fixed on the anchor pole at the C-channel slot bottom back side and constitutes；The anchor pole and C
Shape slot is the integral structure of formed by extrusion and tension, and the notch of C-channel is two in-flanges structures for being symmetrical with C-channel middle line, two institutes
State in-flanges it is opposite be on one side rack structure；The bolt head of the tommyhead bolt is by the first cuboid and the second cuboid structure
At second cuboid is mutually connected with the shank of bolt of tommyhead bolt；The width phase of first cuboid and the second cuboid
Deng the respectively less than width of rebate of C-channel；The length of first cuboid is greater than the width of rebate of C-channel, the two of the second cuboid
The engaging tooth being meshed with corresponding rack gear is offered on a width profile respectively.
The anchor pole at the C-channel slot bottom back side is fixed on to be spaced multiple along C-channel length direction, positioned at adjacent
Fabrication hole is offered on C-channel slot bottom between two anchor poles.
The pre-buried channel flow moulding process of high strength alumin ium alloy pre-buried channel flow component of the present invention carries out as steps described below:
By pultrusion mold described this frame body sectional material of pre-buried channel flow is made in high strength alumin ium alloy aluminium bar material pultrusion by the first step；
Second step, using gear-hobbing machine by two in-flanges phases of the C-channel notch of described this frame body sectional material of pre-buried channel flow
Pair be processed into rack structure on one side；
Third step is cut into the bolt portion on described this frame body sectional material of pre-buried channel flow using cutting apparatus；
The fabrication hole is drilled out in 4th step, the C-channel groove bottom between adjacent anchor pole；
Pre-buried channel flow ontology made of 4th step is carried out surface by micro-arc oxidation processing by the 5th step；
6th step, by the 5th step, pre-buried channel flow is dried up after the micro-arc oxidation treatment, and then suspension type, which is put into, fills colloidal sol
In container, drying is taken out after 4~5min of ultrasonic activation.
The volume proportion of the colloidal sol in 6th step are as follows: ethyl orthosilicate: it dehydrated alcohol: silane coupling agent: goes
Ionized water=5: 10: 1.5: 2.5, colloidal sol total amount >=5ml/cm used2。
Surface by micro-arc oxidation processing in 5th step are as follows: pre-buried channel flow ontology manufactured in the 4th step is deoiled-
Washing-differential arc oxidation-pure water is washed.
The differential arc oxidation process are as follows: select 304 stainless steel plates to do cathode groove body, be added and contain a certain proportion of silicate
Solution, setting 400C±100The operating temperature of C, operating voltage 380V, operating current 250-300A.
The invention has the advantages that improving the intensity and weight bearing power of pre-buried channel flow, high-strength aluminum alloy material density is small, on an equal basis
Consumable material is few under load, saves material cost；Teeth region area is big, and tooth profile is clear, and teeth force part bears to carry
Lotus rank is high, improves teeth resistant slide ability.The engaging tooth of tommyhead bolt is arranged in the side of bolt head, increases T shape spiral shell
Anti-slip coefficient when bolt and pre-buried channel flow cooperate, equipment is mounted when ensure that tommyhead bolt along conduit axially loaded to be sent out
Raw mobile or landing, and when direction of rotation is unrestricted in installation process into C-channel for tommyhead bolt.Pre-buried channel flow passes through mould
Have pultrusion to be integrally formed, the anchor pole for avoiding existing pre-buried channel flow needs anti-riveting or welding bring defect, ensure that product matter
Amount and presentation quality improve the essence of engaging tooth but also the rack gear at C-channel notch on two in-flanges is convenient for gear hobbing process
Degree.The surface treatment of pre-buried channel flow uses micro-arc oxidation treatment, and technical process is environment friendly and pollution-free, and also improve product uses the longevity
Life.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the structural schematic diagram of pre-buried channel flow of the present invention.
Fig. 3 is the left view of Fig. 2.
Fig. 4 is the bottom view of Fig. 2.
Fig. 5 is the structural schematic diagram of tommyhead bolt of the present invention.
Fig. 6 is the left view of Fig. 5.
Fig. 7 is the bottom view of Fig. 5.
Fig. 8 is the structural schematic diagram of pre-buried channel flow profile of the present invention.
Fig. 9 is that use cutting apparatus of the present invention carries out cutting processing schematic diagram on pre-buried channel flow profile.
Figure 10 is moulding process flow process figure of the invention.
Figure 11 is the structural schematic diagram of existing pre-buried channel flow.
Figure 12 is the left view of Figure 11.
Figure 13 is the bottom view of Figure 11.
Figure 14 is that the schematic diagram of corner depositional phenomenon occur in teeth after existing pre-buried channel flow hot galvanizing.
Figure 15 .1,15.2 are tooth form rolling step schematic diagrames in existing pre-buried channel flow C-channel.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention, the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
State embodiment.
As shown in figs. 1-7, high strength alumin ium alloy pre-buried channel flow component of the present invention, including pre-buried channel flow and setting are pre-
Bury the tommyhead bolt 1 in channel recess；Pre-buried channel flow is fixed on the multiple of the slot bottom back side by C-channel 2 and along 2 axially spaced-apart of C-channel
Anchor pole 3 is constituted, and offers fabrication hole 4 on the slot bottom of the C-channel 2 between two neighboring anchor pole 3；Anchor pole 3 and C-channel 2 are logical
Cross that aluminum section extruder pultrusion is into a single integrated structure, the notch of C-channel 2 is two in-flanges 6,7 knots for being symmetrical with C-channel middle line 5
Structure, two in-flanges 6,7 it is opposite be on one side 8 structure of rack gear.
The bolt head of tommyhead bolt 1 is made of the first cuboid 9 and the second cuboid 10, the second cuboid 10 and tommyhead bolt
1 shank of bolt is mutually connected；The width of first cuboid 9 and the second cuboid 10 is equal, respectively less than the width of rebate of C-channel 2；The
The length of one cuboid 9 be greater than C-channel 2 width of rebate, offered on two width profiles of the second cuboid 10 with
The engaging tooth 11 that corresponding rack gear 8 is meshed.
The pre-buried channel flow moulding process of high strength alumin ium alloy pre-buried channel flow component of the present invention carries out as steps described below:
High strength alumin ium alloy aluminium bar material pultrusion is made up such as Fig. 8 institute of pultrusion mold (XJ-1350 aluminum section extruder) for the first step
Pre-buried channel flow this frame body sectional material 12 shown；
Second step, using gear-hobbing machine by two in-flanges 6,7 opposite one of 2 notch of C-channel of pre-buried channel flow this frame body sectional material 12
Wheat flour is at 8 structure of rack gear；
Third step, as shown in figure 9, using cutting apparatus on pre-buried channel flow this frame body sectional material 8 according to cutting line shown in dotted line into
Row cutting processing goes out anchor pole 3；
Fabrication hole 4 is drilled out in 4th step, 2 slot bottom of C-channel between adjacent anchor pole 3；
Pre-buried channel flow ontology made of 4th step is carried out surface by micro-arc oxidation processing by the 5th step；
6th step, by the 5th step, pre-buried channel flow is dried up after micro-arc oxidation treatment, and then suspension type is put into the container for filling colloidal sol
In, drying is taken out after 4~5min of ultrasonic activation, and high strength alumin ium alloy pre-buried channel flow is made.
The volume proportion of colloidal sol in 6th step are as follows: ethyl orthosilicate: dehydrated alcohol: silane coupling agent: deionized water=5:
10: 1.5: 2.5, colloidal sol total amount >=5ml/cm used2。
Surface by micro-arc oxidation processing in 5th step are as follows: pre-buried channel flow ontology manufactured in the 4th step is deoiled-washed-
Differential arc oxidation-pure water is washed.
Differential arc oxidation process are as follows: select 304 stainless steel plates to do cathode groove body, be added molten containing a certain proportion of silicate
Liquid, setting 400C±100The operating temperature of C, operating voltage 380V, operating current 250-300A.
Claims (6)
1. a kind of high strength alumin ium alloy pre-buried channel flow component, including pre-buried channel flow ontology and setting are in the pre-buried channel flow body recess
Interior tommyhead bolt, the pre-buried channel flow ontology are made of C-channel with the anchor pole for being fixed on the C-channel slot bottom back side；Its feature
Be: the anchor pole and C-channel are the integral structure of formed by extrusion and tension, and the notch of C-channel is to be symmetrical in two of C-channel middle line
Turnup structure, two in-flanges it is opposite be on one side rack structure；The bolt head of the tommyhead bolt is by the first cuboid
It is constituted with the second cuboid, second cuboid is mutually connected with the shank of bolt of tommyhead bolt；First cuboid and the second length
The width of cube is equal, respectively less than the width of rebate of C-channel；The length of first cuboid is greater than the width of rebate of C-channel, the
The engaging tooth being meshed with corresponding rack gear is offered respectively on two width profiles of two cuboids.
2. high strength alumin ium alloy pre-buried channel flow component according to claim 1, it is characterised in that: be fixed on the C-channel slot
The anchor pole of bottom back side is spaced multiple, the C-channel slot between the two neighboring anchor pole along C-channel length direction
Fabrication hole is offered on bottom.
3. the pre-buried channel flow moulding process of high strength alumin ium alloy pre-buried channel flow component as described in claim 1, it is characterised in that: according to
Following step carries out:
By pultrusion mold described this frame body sectional material of pre-buried channel flow is made in high strength alumin ium alloy aluminium bar material pultrusion by the first step；
Second step, using gear-hobbing machine by two in-flanges phases of the C-channel notch of described this frame body sectional material of pre-buried channel flow
Pair be processed into rack structure on one side；
Third step is cut into the bolt portion on described this frame body sectional material of pre-buried channel flow using cutting apparatus；
The fabrication hole is drilled out in 4th step, the C-channel groove bottom between adjacent anchor pole；
Pre-buried channel flow ontology made of 4th step is carried out surface by micro-arc oxidation processing by the 5th step；
6th step, by the 5th step, pre-buried channel flow is dried up after the micro-arc oxidation treatment, and then suspension type, which is put into, fills colloidal sol
In container, drying is taken out after 4~5min of ultrasonic activation.
4. the pre-buried channel flow moulding process of high strength alumin ium alloy pre-buried channel flow component according to claim 3, it is characterised in that: institute
State the volume proportion of the colloidal sol in the 6th step are as follows: ethyl orthosilicate: dehydrated alcohol: silane coupling agent: deionized water=5: 10
: 1.5: 2.5, colloidal sol total amount >=5ml/cm used2。
5. the pre-buried channel flow moulding process of high strength alumin ium alloy pre-buried channel flow component according to claim 3, it is characterised in that: institute
State the surface by micro-arc oxidation processing in the 5th step are as follows: pre-buried channel flow ontology manufactured in the 4th step is deoiled-washed-differential of the arc oxygen
Change-pure water is washed.
6. the pre-buried channel flow moulding process of high strength alumin ium alloy pre-buried channel flow component according to claim 5, it is characterised in that: institute
State differential arc oxidation process are as follows: it selects 304 stainless steel plates to do cathode groove body, is added and contains a certain proportion of silicate solutions, setting
400C±100The operating temperature of C, operating voltage 380V, operating current 250-300A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811025494.3A CN109139665A (en) | 2018-09-04 | 2018-09-04 | High strength alumin ium alloy pre-buried channel flow component and pre-buried channel flow moulding process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811025494.3A CN109139665A (en) | 2018-09-04 | 2018-09-04 | High strength alumin ium alloy pre-buried channel flow component and pre-buried channel flow moulding process |
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| CN110242349A (en) * | 2019-06-06 | 2019-09-17 | 法施达科技有限公司 | Pressure sensing built-in sliding chute |
| CN110374208A (en) * | 2019-07-23 | 2019-10-25 | 福建永鑫昌电力科技有限公司 | Aluminum alloy strip Alveolus type built-in fitting |
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| CN110242349A (en) * | 2019-06-06 | 2019-09-17 | 法施达科技有限公司 | Pressure sensing built-in sliding chute |
| CN110374208A (en) * | 2019-07-23 | 2019-10-25 | 福建永鑫昌电力科技有限公司 | Aluminum alloy strip Alveolus type built-in fitting |
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