CN108343246A - A kind of concrete conveyance straight tube and manufacturing method - Google Patents
A kind of concrete conveyance straight tube and manufacturing method Download PDFInfo
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- CN108343246A CN108343246A CN201810391957.1A CN201810391957A CN108343246A CN 108343246 A CN108343246 A CN 108343246A CN 201810391957 A CN201810391957 A CN 201810391957A CN 108343246 A CN108343246 A CN 108343246A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 230000006698 induction Effects 0.000 claims abstract description 64
- 239000002356 single layer Substances 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims description 78
- 230000004323 axial length Effects 0.000 claims description 11
- 238000005552 hardfacing Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010410 layer Substances 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 13
- 238000010791 quenching Methods 0.000 description 13
- 230000006872 improvement Effects 0.000 description 10
- 230000035515 penetration Effects 0.000 description 10
- 230000000171 quenching effect Effects 0.000 description 10
- 230000004927 fusion Effects 0.000 description 8
- 238000005336 cracking Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A kind of concrete conveyance straight tube, including single layer tube body, tube body entrance inner wall are equipped with the first induction quench-hardened case, and tube body outlet section inner wall is equipped with the second induction quench-hardened case, and the wall thickness of tube body is T1, first induction quench-hardened case thickness be T2, second induction quench-hardened case thickness be T3, then T3＜ T2＜ T1.A kind of manufacturing method of above-mentioned concrete conveyance straight tube, including impewdance matching, impewdance matching frequency is 40 80KHz when impewdance matching and the corresponding frequency of the second induction quench-hardened case is 1~2 times of the first induction quench-hardened case, output power is 80 130KW, the speed that tube body is rotated around own axes is 100 300r/min, the corresponding axial speed of service of first induction quench-hardened case is 180 380mm/min, and the corresponding axial speed of service of the second induction quench-hardened case is 280 480mm/min.The present invention has many advantages, such as that at low cost, wearability is good, effectively prevent fracture.
Description
Technical field
The present invention relates to concrete conveyance technology more particularly to a kind of concrete conveyance straight tube and manufacturing methods.
Background technology
Concrete delivery pipe is concrete mixer, boom, Vehicle loaded pump, drag pump etc. by concrete conveyance to destination locations
Necessary pipeline.Its operating mode is mainly determined by pumping pressure, concrete type, aggregate.Pumping pressure determines delivery pipe
The requirement of resistance to compression anti-explosion design, pumping pressure is simultaneously also to determining concrete flow velocity, and concrete flow velocity, type, aggregate are to determine
Determine the principal element of delivery pipe wear-resisting property.In order to cope with force request and wear-resisting functions requirement, in existing technology, tube body is adopted
Not quenching inner wall impewdance matching, mono-layer tube integral quenching, bimetallic tube with single layer pipe outer wall, (ectonexine material is different, and outer layer uses
The material of non-hardenable, internal layer are the material that can be hardened, using mechanical compound or mechanical compound rear further method hot rolling
Manufacture, more high compared with mono-layer tube of cost, and ectonexine can have gap after quenching, toughness deficiency, is struck after internal layer through hardening
Cracking is hit or is susceptible to after colliding, then will appear volume skin, plugging phenomenon when wearing up to very thin or non-through hardening) outer layer do not quench
Internal layer quenches to realize stress and wear-resisting two functions.In addition, nose end is to cope with washing away for concrete, using more than tube body
Wear-resisting rich chromium cast iron, bearing steel, ceramics, the even cast setting of the wear-resistant sleeves such as hard alloy or hardfacing improve pipe
The service life at mouth end.
Attached drawing 1 shows that a kind of integral type straight tube, arrival end use wear-resistant sleeve 1, tube body 2 to use inner wall impewdance matching outer wall
It does not quench, outlet end uses hardfacing 5,2 periphery of tube body that the long flange 3 of entrance is respectively welded and exports short flange 4.This one
Although formula straight tube arrival end solves abrasion caused by the impact of entrance concrete turbulent flow using wear-resistant sleeve 1, due to concrete
After being pumped across bend pipe, (length is generally in 200mm or so) still has lateral impact in straight tube leading portion a certain range, causes
The abrasion of straight tube leading portion is more violent than back segment, and wall thickness is consistent everywhere for integral type straight tube, rushing within the scope of unresolved entrance 200mm
Even if brush wear can not solve using the long flange of entrance of 120mm long.The manufacturing process flow of this kind of straight tube is：Under flange
Material cutting and tube body blanking cutting --- flange machining --- flange and pipe welding --- outlet built-up welding --- inboard wall of tube body
Impewdance matching --- press fitting entrance wear-resistant sleeve --- application.
Patent document CN104209712A discloses a kind of concrete delivery pipe and preparation method thereof, concrete mixer,
Middle concrete delivery pipe arrival end and outlet end, which are all made of wear-resistant sleeve solution concrete turbulent flow, leads to impact wear, and in entrance
Erosive wear within the scope of entrance 200mm is solved using lack of penetration butt welding connected double-layer pipe, but there are notch effect,
In the case where pumping responsive to axial force, the butt weld fatigue life of bimetallic tube and mono-layer tube is very low, there are the risk of larger cracking,
Concrete ejection can be caused out to hurt sb.'s feelings or other properties are ruined in dirt after cracking, and there are still the plugging risks of bimetallic tube.It is this kind of straight
The manufacturing process flow of pipe is：Mono-layer tube, bimetallic tube, flange --- flange machining --- single layer and bimetallic tube weldering are cut in blanking
Connect --- mono-layer tube, double-deck inside pipe wall impewdance matching --- water-spraying control welded steel double pipe end flange --- the welding mono-layer tube hold-carrying
Blue --- press fitting wear-resistant sleeve --- application.
Patent document CN105736845A discloses a kind of concrete delivery pipe, concrete mixer and manufacture concrete conveyance
The method of pipe.This concrete delivery pipe has the advantages that aforementioned two kinds of straight tubes, while also solving lacking for above two straight tube
Point, the i.e. erosive wear of entrance 200mm ranges and tube body butt weld are broken, but it also brings other shortcomings：1) first
Flange, second flange length are longer, and manufacture is complicated, and waste of material rate is high, of high cost；2) straight tube is fixed in the part on distributing arm support
U-bolt may be fixed in first flange and second flange, and when pumping, the shaking of arm support passes through U to delivery pipe pulling force
Type bolt passes to flange, and flange passes to tube body by lap weld, and the lap weld still suffers from the axial direction of pumping in addition
Fatigue stress, therefore there are very big cracking risks for the lap weld, in fact, being similar to patent document CN104209712A
In concrete delivery pipe flange and tube body lap weld all there is cracking phenomena；3) due to first segment and second segment by
Nearly flange end is not fixed, and when impewdance matching causes deformation big.The manufacturing process flow of this kind of straight tube：Tube body, method are cut in blanking
Blue --- flange machining --- flange and pipe welding --- inner wall impewdance matching --- press fitting wear-resistant sleeve --- application.
In addition, the concrete conveyance pipe flange supplied on existing market and pipe welding are essentially all using solid welding wire
CO2Gas shield welding or solid welding wire full-argon gas shielded arc welding, both welding manner fusion penetrations are relatively large, welding current 200A
When, the former can reach 3-4mm, and the latter can reach 1.5-3mm, and flange generally uses ER50-6 low with the connection of tube body weldering
Carbon steel welding wire, for welding wire by mono-layer tube tube body after the part of dilution of molten bath, quenching hardness is low, all without solving patent document
Welding region described in CN104209712A can not ensure the problem of tube body wearability.As shown in Fig. 2, wherein 10 be weld seam
Area, 20 be welding heat affected zone, and 30 quench layer, i.e. wearing layer for straight tube inner wall.From the wearing layer that can be seen that in diagram from this
30 thinner thicknesses become the weakness of straight tube bulk life time.Even if this problem in patent document CN104209712A as mentioning
Take welding simultaneously steel pipe inner wall water spray or misting cooling, the smaller smaller foot welding height of welding current voltage, all
Smaller welding penetration can not be taken into account to obtain and fuse good weldquality, namely cannot achieve that neither to influence tube body wear-resisting
Property, and avoid cracking with good welding quality.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of simple in structure, at low cost, resistance to
Mill property is good, effectively prevent the concrete conveyance straight tube being broken.
The present invention further provides a kind of manufacturing methods of above-mentioned concrete conveyance straight tube.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of concrete conveyance straight tube, including single layer tube body, the tube body entrance inner wall are equipped with the first induction quench-hardened case,
The tube body outlet section inner wall is equipped with the second induction quench-hardened case, and the wall thickness of the tube body is T1, the first induction quench-hardened case
Thickness is T2, the thickness of the second induction quench-hardened case is T3, then T3＜ T2＜ T1。
As a further improvement of the above technical scheme：Concrete conveyance straight tube further includes the set set on the tube body periphery
Pipe, the tube body both ends are equipped with flange, described sleeve pipe one end and tube body entrance, the flange welding of tube body entrance, casing
The other end is welded with tube body outlet section, and flange and the tube body outlet section of tube body outlet section weld.In tube body periphery, casing, set are set
Pipe and the corresponding tube body of the first induction quench-hardened case of entrance flange covering, can form tube body and protect, and be promoted after thickening hardens
The resistance to compression capability of antidetonance of tube body；It is also beneficial to prevent quenching distortion after tube body both ends and flange welding；Casing, tube body and entrance
Axial tension stress can be born after flange welding together, the lap weld outside U-bolt among tube body can be further prevented to open
It splits.
As a further improvement of the above technical scheme：Inlet wear structure, outlet are equipped in the flange of entrance
Outlet wear structure, the axial length of the first induction quench-hardened case and the inlet wear structure are equipped in the flange of section
The sum of be L, then 100mm≤L≤200mm.Inlet porting abrasion-proof structure and outlet wear structure, improve concrete conveyance straight tube
In the wear-resisting property of entrance and outlet section, the sum of the first induction quench-hardened case and the axial length of inlet wear structure are in 100-
It is matched with actual condition between 200mm, promotes whole service life.
As a further improvement of the above technical scheme：The inlet wear structure is wear-resistant sleeve, the outlet wear knot
Structure is hardfacing or wear-resistant sleeve.
As a further improvement of the above technical scheme：The inlet wear structure is including the first wear-resistant sleeve and positioned at first
The second wear-resistant sleeve on the inside of wear-resistant sleeve, the hardness of first wear-resistant sleeve are more than the hardness of second wear-resistant sleeve.Closer to entering
Mouthful position, abrasion is more serious, can according to the difference of position using the wear-resistant sleeve of two kinds of different hardness different wear-resisting properties in other words
Farthest to increase service life.
As a further improvement of the above technical scheme：The outer diameter of the wear-resistant sleeve outer end is more than the outer diameter of inner end, wear-resisting
The internal diameter for covering outer end is equal with the internal diameter of inner end.Closer to entry position, abrasion is more serious, and the outer diameter of wear-resistant sleeve outer end is arranged
For the outer diameter more than inner end, is conducive to the antiwear property for reinforcing wear-resistant sleeve outer end, improves service life.
As a further improvement of the above technical scheme：4mm≤T1≤ 5.5mm, 0mm ＜ T1-T2≤ 1mm namely entrance
The thickness of the corresponding non-quench-hardened case of tube body is 0-1mm, and conventional delivery pipe is not hardened to ensure the uprising bearing capacity of tube body
The thickness of layer is generally kept in 2mm or more, and the application can farthest increase entrance tube body due to the improvement of structure
Wear-resisting property improves service life；T1-T3The thickness of >=1.5mm namely the corresponding non-quench-hardened case of outlet section tube body is not less than
1.5mm ensures tube body resistance to compression antiknock, and the wall thickness of described sleeve pipe is T4, then 1.5mm≤T4≤2.5mm。
A kind of manufacturing method of above-mentioned concrete conveyance straight tube, including impewdance matching, impewdance matching frequency when impewdance matching
Rate is 40-80KHz and the corresponding frequency of the second induction quench-hardened case is 1~2 times of the corresponding frequency of the first induction quench-hardened case, output
Power is 80-130KW, and the speed that tube body is rotated around own axes is 100-300r/min, and the first induction quench-hardened case corresponds to
The axial speed of service be 180-380mm/min, the corresponding axial speed of service of the second induction quench-hardened case is 280-
480mm/min。
As a further improvement of the above technical scheme：The manufacturing method of above-mentioned concrete conveyance straight tube, including step：
S1, casing are fixed：Casing is first sheathed on tube body periphery, then spot welding is fixed；
S2, welding：By the flange welding of casing one end and tube body entrance, tube body entrance, the casing other end and tube body
Outlet section welds, and preferably increases the plug welding of casing and tube body in casing and tube body outlet section weld seam end, is conducive to prevent from cracking, manages
The flange welding of body outlet section and outlet section, wherein it is more than the flux-cored arc welding of 400MPa when welding using intensity,
And 1.5-3 times that leg axial length is vertically oriented；Compared with conventional solid welding wire gas shielded arc welding, it is more than using intensity
400MPa flux-cored arc weldings so that fusion penetration still ＜ 2mm when welding current ＜ 260A both ensure appearance of weld in this way
Ensure that connection is reliable, and reduces on the influence of the wearability of tube body, and 1.5-3 times that leg axial length is vertically oriented.
S3, impewdance matching：Impewdance matching frequency is 40-80KHz and the corresponding frequency of the second induction quench-hardened case when impewdance matching
Rate is 1~2 times of the corresponding frequency of the first induction quench-hardened case, and output power 80-130KW, tube body is rotated around own axes
Speed is 100-300r/min, and the corresponding axial speed of service of the first induction quench-hardened case is 180-380mm/min, described the
The corresponding axial speed of service of two induction quench-hardened cases is 280-480mm/min.
As a further improvement of the above technical scheme：The manufacturing method of above-mentioned concrete conveyance straight tube, including step：
When the outlet wear structure is hardfacing, manufacturing method includes the following steps：
S1, casing are fixed：Casing is first sheathed on tube body periphery, then spot welding is fixed；
S2, welding：By the flange welding of casing one end and tube body entrance, tube body entrance, the casing other end and tube body
Outlet section welds, the flange welding of tube body outlet section and outlet section, wherein medicine core when welding using intensity more than 400MPa is welded
Silk gas shielded arc welding, and leg axial length is vertically oriented 1.5-3 times of length；
S3, hardfacing is completed；
S4, impewdance matching：Impewdance matching frequency is 40-80KHz and the corresponding frequency of the second induction quench-hardened case when impewdance matching
Rate is 1~2 times of the corresponding frequency of the first induction quench-hardened case, and output power 80-130KW, tube body is rotated around own axes
Speed is 100-300r/min, and the corresponding axial speed of service of the first induction quench-hardened case is 180-380mm/min, described the
The corresponding axial speed of service of two induction quench-hardened cases is 280-480mm/min；
S5, press fitting entrance abrasion-proof structure；
When the outlet wear structure is wear-resistant sleeve, manufacturing method includes the following steps：
S1, casing are fixed：Casing is first sheathed on tube body periphery, then spot welding is fixed；
S2, welding：By the flange welding of casing one end and tube body entrance, tube body entrance, the casing other end and tube body
Outlet section welds, the flange welding of tube body outlet section and outlet section, wherein medicine core when welding using intensity more than 400MPa is welded
Silk gas shielded arc welding, and leg axial length is vertically oriented 1.5-3 times of length；
S3, impewdance matching：Impewdance matching frequency is 40-80KHz, output power 80-130KW, tube body when impewdance matching
The speed rotated around own axes is 100-300r/min, and the corresponding axial speed of service of the first induction quench-hardened case is 180-
380mm/min, the corresponding axial speed of service of the second induction quench-hardened case is 280-480mm/min；
S4, press fitting entrance abrasion-proof structure and outlet wear structure.
Compared with the prior art, the advantages of the present invention are as follows：Concrete conveyance straight tube disclosed by the invention, using single layer
Tube body rather than double-deck pipe body reduce tube body purchase cost；Tube body entrance inner wall is equipped with the first induction quench-hardened case, tube body outlet
Section inner wall is equipped with the second induction quench-hardened case, and the first induction layer thickness of hardening is hardened layer thickness more than the second induction, and is not quenched completely
Thoroughly, while utmostly ensureing inboard wall of tube body wearability, service life, tube body can also bear axial tension stress；Tube body
As main stress object, itself is not present weld seam, is conducive to that tube body is avoided to be broken；Simultaneously without long flange is used, machine is reduced
Processing cost and waste of raw materials.
The manufacturing method of concrete conveyance straight tube disclosed by the invention, frequency select 40-80KHz and the second induction quench-hardened case
Corresponding frequency is 1~2 times of the corresponding frequency of the first induction quench-hardened case, and during continuous quenching, frequency can be larger
Range changes automatically, can also immobilize so that quenching quality and being optimal of the thermal efficiency, output power 80-130KW,
Adjust automatically in a certain range can be realized during continuous quenching.Based on said frequencies and output power, by the way that tube body is revolved
Rotary speed control is controlled in 100-300r/min, the corresponding axial speed of service of the first induction quench-hardened case in 180-380mm/min,
The corresponding axial speed of service control of second induction quench-hardened case can make quenching layer abrasion-resistant tissues equal in 280-480mm/min
It is even consistent, overcome the difficulties in quality control of impewdance matching.
Description of the drawings
Fig. 1 is the structural schematic diagram of existing integral type straight tube.
Fig. 2 is the amplified structural schematic diagram of solid welding wire gas shield welding line.
Fig. 3 is the structural schematic diagram of the first embodiment of concrete conveyance straight tube of the present invention.
Fig. 4 is the structural schematic diagram of second of embodiment of concrete conveyance straight tube of the present invention.
Fig. 5 is the structural schematic diagram of the third embodiment of concrete conveyance straight tube of the present invention.
Fig. 6 is the structural schematic diagram of the 4th kind of embodiment of concrete conveyance straight tube of the present invention.
Each label indicates in figure：1, wear-resistant sleeve；11, the first wear-resistant sleeve；12, the second wear-resistant sleeve；2, tube body；21, the first sense
Answer quench-hardened case；22, the second induction quench-hardened case；3, the long flange of entrance；4, short flange is exported；5, hardfacing；6, casing；7, method
It is blue；8, inlet wear structure；9, outlet wear structure；10, weld metal zone；20, welding heat affected zone；30, wearing layer；40, tube body,
Entrance flange and casing three's weld seam；50, tube body and casing weld seam；60, tube body and outlet section seam flange.
Specific implementation mode
Below in conjunction with Figure of description and specific embodiment, invention is further described in detail.
Embodiment one
Fig. 3 shows a kind of embodiment of concrete conveyance straight tube of the present invention, be a kind of structure is most simple, economic cost most
Low technical solution.Wherein：Arrow flows to for concrete, and 7：Flange, material is 20 steel or Q345 steel pipes, by blanking --- machine
Machine-shaping is conventional steps, repeats no more；1：Wear-resistant sleeve, material be GCr15 bearing steels, mould steel or rich chromium cast iron, heat at
Hardness HRC ＞ 55 after reason are conventional steps, repeat no more；40：6 three's weld seam of tube body 2, entrance flange 7 and casing, is adopted
It is welded with the flux-cored wire of intensity ＞ 400MPa, not only ensures welding quality, but also have shallow fusion penetration, weld width 3-10mm；6：Casing,
Material is 20 steel or Q345 steel pipes, is mainly used for improving the resistance to compression antiknock that tube body 2 thickeies part of hardening；21：First induction is hardened
Layer constitutes a homogeneous tube with the second induction quench-hardened case 22, but its hardening depth is thicker than the second induction quench-hardened case 22, only surplus 0-1mm
Non- through hardening；50：Casing 6 and 2 lap weld of tube body are welded using the flux-cored wire of intensity ＞ 400MPa, both ensure welding quality,
There is shallow fusion penetration again, in addition its leg horizontal length (namely axial length) is 1.5-3 times of vertical length；22：Second induction is quenched
Hard formation, do not harden thickness >=1.5mm；60：Outlet section flange 7 and 2 lap weld of tube body, using the medicine core of intensity ＞ 400MPa
Welding wire welds, and not only ensures welding quality, but also have shallow fusion penetration, and in addition its leg horizontal length is 1.5-3 times of vertical length；5：It is resistance to
Built-up welding is ground, using rich chromium cast iron or the wear-resisting wlding built-up welding of hard alloy.
The fabrication processing of the concrete conveyance straight tube of the present embodiment is：Tube body 2, casing 6 and two flanges, 7 blanking are cut
Cutting --- flange 7 machines, and casing 6 is inserted in 2 spot welding of tube body and fixes --- two end flanges 7 and 2 groups of welderings of tube body --- welding
Weld seam 40,50 and 60 --- seal --- 2 inner wall impewdance matching of tube body --- press fitting wear-resistant sleeve 1 and (preferably use glue by hardfacing 5
It is fixed) --- application and mark.
Embodiment two
Fig. 4 shows another embodiment of the present invention, the concrete conveyance straight tube structure and embodiment one of the present embodiment
It is essentially identical, the difference is that, the present embodiment middle outlet abrasion-proof structure 9 also uses wear-resistant sleeve 1, can be with compared with embodiment one
Increase the wear-resisting property of 2 outlet section of tube body.
The fabrication processing of the concrete conveyance straight tube of the present embodiment and the fabrication processing basic one of embodiment one
It causes, the difference is that being sealed without hardfacing 5, outlet section wear-resistant sleeve 1 can be respectively completed before application and identification of steps
With the press fitting of entrance wear-resistant sleeve 1.
Embodiment three
Fig. 5 shows another embodiment of concrete conveyance straight tube of the present invention, is a kind of longest technology of service life
Scheme.
Wherein：7：Flange, material is 20 steel or Q345 steel pipes, by blanking --- it is machining；11：First is wear-resisting
Set, material is rich chromium cast iron, hardness HRC ＞ 58 after heat treatment, and wearability is 1.5 times or more of the second wear-resistant sleeve 12, and the
The wall thickness of one itself outer end of wear-resistant sleeve 11 (being right end in attached drawing) is more than the wall thickness of inner end (being left end in attached drawing)；40：Tube body 2,
6 three's weld seam of entrance flange 7 and casing is welded using the flux-cored wire of intensity ＞ 400MPa, not only ensures welding quality, but also
There are shallow fusion penetration, weld width 3-10mm；6：Casing, material are 20 steel or Q345 steel pipes, are mainly used for improving tube body 2 and thickening hardening
Partial resistance to compression antiknock；21：First induction quench-hardened case constitutes a homogeneous tube, but its hardening depth with the second induction quench-hardened case 22
It is thicker than the second induction quench-hardened case 22, the only non-through hardening of surplus 0-1mm；50：Casing 6 and 2 lap weld of tube body, using intensity ＞ 400MPa
Flux-cored wire welding, not only ensure welding quality, but also have shallow fusion penetration, in addition its leg horizontal length is the 1.5-3 of vertical length
Times；22：Second induction quench-hardened case, do not harden thickness >=1.5mm；60：Outlet section flange 7 and 2 lap weld of tube body, using strong
The flux-cored wire welding for spending ＞ 400MPa, not only ensures welding quality, but also have shallow fusion penetration, in addition its leg horizontal length is vertically long
1.5-3 times of degree；12：Second wear-resistant sleeve, material are GCr15 bearing steels, mould steel or rich chromium cast iron, hardness HRC after heat treatment
＞ 55.
The fabrication processing of the concrete conveyance straight tube of the present embodiment is：Tube body 2, casing 6 and two flanges, 7 blanking are cut
Cut --- welding that two flanges 7 machine and casing 6 is inserted in 2 spot welding of tube body and fix --- two end flanges 7 and 2 groups of welderings of tube body ---
Weld seam 40,50 and 60 --- 2 inner wall impewdance matching of tube body --- is pressed the second wear-resistant sleeve 12 of outlet section wear-resistant sleeve 1, entrance
With the first wear-resistant sleeve 11 of entrance --- application and mark.
Example IV
Fig. 6 shows another embodiment of concrete conveyance straight tube of the present invention, the economy of the present embodiment and wear-resisting longevity
For life between embodiment two and embodiment three, flange 7 and inlet wear structure 8, outlet wear structure 9 can be with embodiments
Two is identical, can also be identical as embodiment three.
The fabrication processing of the concrete conveyance straight tube of the present embodiment is consistent with the fabrication processing of embodiment three, no
It repeats again.
The 4.5mm mono-layer tubes of existing market sale, harden thickness 2-2.5mm, pumps the service life about 2-3 of normal concrete
Incomparably, after concrete conveyance straight tube using the present invention, arrival end hardens thickness up to 4mm or more, only improves 60- with thickness
100%, wearability accordingly promotes 50-75% calculating, you can to reach 3.5 ten thousand sides or more.
Show by repetition test：As a result of specific quenching frequency, output power, rotary speed and axial fortune
Scanning frequency degree can obtain the more uniform quench-hardened case of hardness, and wearability can promote 30% or more, and concrete of the invention is defeated
Send straight tube when tube body 2 using 4.5mm thickness when the service life up to ten thousand sides of 3.5-5.
Due to the improvement of welding point, and more suitably flux-cored wire is selected to weld, reliability analysis is obviously improved, and is welded
Stitching area's tube body 2 does not become wear-resisting weakness.
Since the first induction quench-hardened case 21, second incudes the control of 22 thickness of quench-hardened case and the use of casing 6, by coagulation
The resistance to compression antiknock safety of soil conveying straight tube and being optimal of wearability.Simultaneously without using bimetallic tube, tube body 2 material unit price
Decline about 3000 yuan/ton, without the flange extension in setting patent document CN105736845A, there is higher cost performance.
Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, every
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (10)
1. a kind of concrete conveyance straight tube, including single layer tube body (2), it is characterised in that：Tube body (2) the entrance inner wall is equipped with
First induction quench-hardened case (21), tube body (2) the outlet section inner wall are equipped with the second induction quench-hardened case (22), the tube body (2)
Wall thickness is T1, it is described first induction quench-hardened case (21) thickness be T2, it is described second induction quench-hardened case (22) thickness be T3, then
T3＜ T2＜ T1。
2. concrete conveyance straight tube according to claim 1, it is characterised in that：Further include being set to the tube body (2) periphery
Casing (6), tube body (2) both ends are equipped with flange (7), described sleeve pipe (6) one end and tube body (2) entrance, tube body (2)
The flange (7) of entrance welds, and casing (6) other end is welded with tube body (2) outlet section, the flange (7) of tube body (2) outlet section with
Tube body (2) outlet section welds.
3. concrete conveyance straight tube according to claim 2, it is characterised in that：It is equipped in the flange (7) of entrance
Inlet wear structure (8), the flange (7) of outlet section is interior to be equipped with outlet wear structure (9), the first induction quench-hardened case
(21) be L with the sum of the axial length of the inlet wear structure (8), then 100mm≤L≤200mm.
4. concrete conveyance straight tube according to claim 3, it is characterised in that：The inlet wear structure (8) is wear-resisting
It covers (1), the outlet wear structure (9) is hardfacing (5) or wear-resistant sleeve (1).
5. concrete conveyance straight tube according to claim 4, it is characterised in that：The inlet wear structure (8) includes the
One wear-resistant sleeve (11) and the second wear-resistant sleeve (12) on the inside of the first wear-resistant sleeve (11), the hardness of first wear-resistant sleeve (11)
More than the hardness of second wear-resistant sleeve (12).
6. concrete conveyance straight tube according to claim 4, it is characterised in that：The outer diameter of wear-resistant sleeve (1) outer end is big
The internal diameter of outer diameter in inner end, wear-resistant sleeve (1) outer end is equal with the internal diameter of inner end.
7. the concrete conveyance straight tube according to any one of claim 2 to 6, it is characterised in that：4mm≤T1≤ 5.5mm,
0mm ＜ T1-T2≤ 1mm, T1-T3The wall thickness of >=1.5mm, described sleeve pipe (6) are T4, then 1.5mm≤T4≤2.5mm.
8. the manufacturing method of the concrete conveyance straight tube described in a kind of any one of claim 1 to 7, it is characterised in that：Including
Impewdance matching, impewdance matching frequency is 40-80KH when impewdance matchingzAnd second induction quench-hardened case (22) corresponding frequency be first
Incude 1~2 times, output power 80-130KW of the corresponding frequency of quench-hardened case (21), the speed that tube body (2) is rotated around own axes
Degree is 100-300r/min, and the corresponding axial speed of service of the first induction quench-hardened case (21) is 180-380mm/min, described
The corresponding axial speed of service of second induction quench-hardened case (22) is 280-480mm/min.
9. the manufacturing method of the concrete conveyance straight tube described in a kind of any one of claim 2 to 7, it is characterised in that：Including
Step：
S1, casing (6) are fixed：Casing (6) is first sheathed on tube body (2) periphery, then spot welding is fixed；
S2, welding：The flange (7) of casing (6) one end and tube body (2) entrance, tube body (2) entrance is welded, casing (6) is another
One end is welded with tube body (2) outlet section, and the flange (7) of tube body (2) outlet section and outlet section welds, wherein using intensity when welding
Flux-cored arc welding more than 400MPa, and 1.5-3 times that leg axial length is vertically oriented；
S3, impewdance matching：Impewdance matching frequency is 40-80KHz and the corresponding frequency of the second induction quench-hardened case (22) when impewdance matching
Rate is 1~2 times, output power 80-130KW of the corresponding frequency of the first induction quench-hardened case (21), and tube body (2) is around own axes
The speed of rotation is 100-300r/min, and the corresponding axial speed of service of the first induction quench-hardened case (21) is 180-380mm/
Min, the corresponding axial speed of service of the second induction quench-hardened case (22) is 280-480mm/min.
10. the manufacturing method of the concrete conveyance straight tube described in a kind of any one of claim 3 to 7, it is characterised in that：Work as institute
State outlet wear structure (9) be hardfacing (5) when, manufacturing method includes the following steps：
S1, casing (6) are fixed：Casing (6) is first sheathed on tube body (2) periphery, then spot welding is fixed；
S2, welding：The flange (7) of casing (6) one end and tube body (2) entrance, tube body (2) entrance is welded, casing (6) is another
One end is welded with tube body (2) outlet section, and the flange (7) of tube body (2) outlet section and outlet section welds, wherein using intensity when welding
Flux-cored arc welding more than 400MPa, and leg axial length is vertically oriented 1.5-3 times of length；
S3, hardfacing (5) is completed；
S4, impewdance matching：Impewdance matching frequency is 40-80KHz and the corresponding frequency of the second induction quench-hardened case (22) when impewdance matching
Rate is 1~2 times, output power 80-130KW of the corresponding frequency of the first induction quench-hardened case (21), and tube body (2) is around own axes
The speed of rotation is 100-300r/min, and the corresponding axial speed of service of the first induction quench-hardened case (21) is 180-380mm/
Min, the corresponding axial speed of service of the second induction quench-hardened case (22) is 280-480mm/min；
S5, press fitting entrance abrasion-proof structure (8)；
When the outlet wear structure (9) is wear-resistant sleeve (1), manufacturing method includes the following steps：
S1, casing (6) are fixed：Casing (6) is first sheathed on tube body (2) periphery, then spot welding is fixed；
S2, welding：The flange (7) of casing (6) one end and tube body (2) entrance, tube body (2) entrance is welded, casing (6) is another
One end is welded with tube body (2) outlet section, and the flange (7) of tube body (2) outlet section and outlet section welds, wherein using intensity when welding
Flux-cored arc welding more than 400MPa, and leg axial length is vertically oriented 1.5-3 times of length；
S3, impewdance matching：When impewdance matching impewdance matching frequency be 40-80KHz, output power 80-130KW, tube body (2) around
The speed of own axes rotation is 100-300r/min, and described first, which incudes the corresponding axial speed of service of quench-hardened case (21), is
180-380mm/min, the corresponding axial speed of service of the second induction quench-hardened case (22) is 280-480mm/min；
S4, press fitting entrance abrasion-proof structure (8) and outlet wear structure (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810391957.1A CN108343246A (en) | 2018-04-27 | 2018-04-27 | A kind of concrete conveyance straight tube and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810391957.1A CN108343246A (en) | 2018-04-27 | 2018-04-27 | A kind of concrete conveyance straight tube and manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108343246A true CN108343246A (en) | 2018-07-31 |
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ID=62955266
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810391957.1A Pending CN108343246A (en) | 2018-04-27 | 2018-04-27 | A kind of concrete conveyance straight tube and manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715117A (en) * | 2019-09-10 | 2020-01-21 | 中联重科股份有限公司 | Concrete conveying pipe and manufacturing method thereof |
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| WO2007093256A1 (en) * | 2006-02-15 | 2007-08-23 | Putzmeister Aktiengesellschaft | Composite conveying pipe |
| CN103591390A (en) * | 2013-11-19 | 2014-02-19 | 中联重科股份有限公司 | Concrete slurry conveying device and concrete pump truck with same |
| CN103615631A (en) * | 2013-11-19 | 2014-03-05 | 中联重科股份有限公司 | Concrete conveying straight pipe, manufacturing method thereof and concrete pumping equipment |
| CN105736845A (en) * | 2014-12-11 | 2016-07-06 | 中联重科股份有限公司 | Concrete conveying pipe, concrete pump truck and method for manufacturing concrete conveying pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007093256A1 (en) * | 2006-02-15 | 2007-08-23 | Putzmeister Aktiengesellschaft | Composite conveying pipe |
| CN103591390A (en) * | 2013-11-19 | 2014-02-19 | 中联重科股份有限公司 | Concrete slurry conveying device and concrete pump truck with same |
| CN103615631A (en) * | 2013-11-19 | 2014-03-05 | 中联重科股份有限公司 | Concrete conveying straight pipe, manufacturing method thereof and concrete pumping equipment |
| CN105736845A (en) * | 2014-12-11 | 2016-07-06 | 中联重科股份有限公司 | Concrete conveying pipe, concrete pump truck and method for manufacturing concrete conveying pipe |
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| CN110715117A (en) * | 2019-09-10 | 2020-01-21 | 中联重科股份有限公司 | Concrete conveying pipe and manufacturing method thereof |
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Effective date of registration: 20191219 Address after: Room 1290, room 1009, Hunan Lugu information port, No. 658, Lugu Avenue, Changsha hi tech Development Zone, Changsha City, Hunan Province Applicant after: Changsha SanRui Material Technology Co.,Ltd. Address before: 410013 Changsha, Yuelu District, Yuelu District, Yuelu District basin, Lake Pok Hu community landscape, Yufeng District, 4 houses 1402 Applicant before: Rong Ransheng |
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Application publication date: 20180731 |