CN114953524A - Continuous annealing process for plastic pipe - Google Patents
Continuous annealing process for plastic pipe Download PDFInfo
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- CN114953524A CN114953524A CN202210577406.0A CN202210577406A CN114953524A CN 114953524 A CN114953524 A CN 114953524A CN 202210577406 A CN202210577406 A CN 202210577406A CN 114953524 A CN114953524 A CN 114953524A
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- 238000000137 annealing Methods 0.000 title claims abstract description 120
- 239000004033 plastic Substances 0.000 title claims abstract description 53
- 229920003023 plastic Polymers 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims description 74
- 230000009471 action Effects 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 8
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 229920005630 polypropylene random copolymer Polymers 0.000 description 10
- 238000011282 treatment Methods 0.000 description 9
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- 230000000903 blocking effect Effects 0.000 description 4
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- 238000009434 installation Methods 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
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- 239000004743 Polypropylene Substances 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
-
- 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
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Materials Engineering (AREA)
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- Heat Treatment Of Articles (AREA)
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Abstract
The invention discloses a plastic pipe continuous annealing process, which comprises the following steps: 1) and (3) cyclic heating of an annealing furnace: 2) feeding of an annealing furnace: 3) annealing of the annealing furnace: 4) blanking of an annealing furnace: 5) and finishing the annealing furnace process. The continuous annealing process provided by the invention has the advantages of high automation degree, good heating uniformity in the annealing process, accurate control of annealing time, guarantee of the mechanical property of each pipe and improvement of the product quality.
Description
Technical Field
The invention relates to the technical field of plastic pipe annealing, in particular to a plastic pipe continuous annealing process.
Background
The random copolymerization polypropylene has the advantages of heat preservation, energy conservation, environmental protection, excellent heat resistance, oxygen stability, sanitary performance and the like, and has wide application in the industrial field in recent years due to excellent physical and mechanical properties, molding processability, good chemical stability, heat resistance, creep resistance and the like, and is particularly prominent in the application aspect of indoor and outdoor cold and hot water pipes. PPR pipes have very high requirements on the comprehensive properties of resins, and require good rigidity, heat resistance, chemical resistance and creep resistance of the resins, and certain impact resistance. But the production, storage, transportation, installation and use of the PPR pipe are influenced due to the problems of high low-temperature brittleness, easy generation of stress induced cracking and the like.
In order to effectively improve and improve the comprehensive performance of the PPR pipe and widen the application field of the PPR pipe, methods such as blending modification, filling modification, annealing and the like are mostly adopted to toughen and modify the PPR pipe. The blending modification is used for dispersing the elastomer or trace nanoparticles in the PPR substrate material in a particulate form to improve the toughness of plastics, and the method has more researches at present and obvious effect. Common elastomers for blend modification of PPR include ethylene-octene copolymer (POE), high density polyethylene (PE-HD), styrene thermoplastic elastomer (SBS), etc. The filling modification is to add some fillers in the plastic molding processing, which not only improves and enhances the performance of the plastic products, but also reduces the preparation cost. The main used fillers include CaCO 3, SiO2, TiO2, talcum powder, mica, kaolin, montmorillonite, glass fiber and the like. However, both blending and filling modification have the problems of obvious agglomeration of the second phase maldistributed particles and poor compatibility with the matrix. The annealing is environment-friendly, safe and efficient, the problems of high cooling rate and incomplete crystal development in the polymer processing and forming process can be solved through proper annealing treatment, the crystallization process of the polymer is effectively improved, and the residual stress in the matrix is reduced, so that the comprehensive mechanical property of the material is improved.
Chinese invention patent application no: 201510911629.6, discloses a production process of a polypropylene random copolymer pipe material with internal stress removed, which comprises the steps of placing a formed PP-R pipe material into a drying vehicle, adjusting the temperature, raising the temperature from room temperature to 40-60 ℃ within a certain time, keeping the temperature at 40-60 ℃ for 3-7 minutes, raising the temperature from 40-60 ℃ to 70-95 ℃ within a certain time, keeping the temperature at 70-95 ℃ for 3-7 minutes, raising the temperature from 70-95 ℃ to 104-; naturally cooling to 30-40 deg.C within 0.7-1.5 hr, pushing the drying vehicle out of the oven, and cooling to normal temperature. However, the annealing process is a secondary process, the whole vehicle product needs to be put into an annealing box for heat treatment, and the annealing process is complicated and long in time.
Chinese invention patent numbers: 201510562833.1, discloses a PPR pipe annealing process, which comprises five heating treatments and cooling treatments, wherein the first and second heating treatments are controlled at the temperature below 100 ℃, and the heating treatment time is controlled at about 2 hours, so as to prevent the pipe deformation caused by overhigh temperature and overlong time; the temperature of the third and fourth heating treatment is controlled below 125 ℃, the heating treatment time is controlled to be about 1 hour, and the internal stress generated by PPR molecular crystallization in the pipe production process is eliminated or reduced; the fifth heating treatment temperature is controlled below 100 ℃, the heating treatment time is controlled to be about 0.5 hour, the internal stress generated secondarily in the annealing process is prevented or reduced, and the problem of shrinkage, bending and deformation of the pipe caused by overlarge temperature difference is reduced.
The invention has the patent numbers: 201621356674.6, providing a shelf for plastic pipe annealing, wherein the shelf is provided with a frame and a plurality of food drawers, the food drawers can be arranged in the frame in a stacking way, then the plastic pipes are prevented from being arranged on the surfaces of the food drawers side by side, each layer of food drawers can fix the plastic pipes and simultaneously reserve enough space to avoid the damage caused by mutual extrusion between the plastic pipes and the deformation caused by stress during cooling; by arranging the positioning insertion shafts and the positioning insertion slots, the frames can be stacked, so that the plastic pipes occupy small area, are good in stacking firmness, and are large in number when being transported at one time and large in number when being annealed at one time; by arranging the fork truck jacks and the rollers, the shelf can be conveniently transported, and continuous annealing operation cannot be realized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a plastic pipe continuous annealing process with reasonable design.
The technical scheme of the invention is as follows:
a continuous annealing process for plastic pipes comprises the following steps:
1) and (3) cyclic heating of an annealing furnace: arranging a hot air circulation heating device on the annealing furnace, pumping air in the annealing furnace out of the side part of the annealing furnace, heating, and then sending the heated air into the annealing furnace from the top part of the annealing furnace to realize hot air circulation heating;
2) feeding of an annealing furnace: sequentially lifting the plastic pipes to the top of the annealing furnace from the bottom of one side of the annealing furnace through a pipe feeding mechanism;
3) annealing of the annealing furnace: the plastic pipe enters the topmost layer after reaching the top of the annealing furnace, is horizontally conveyed to the other side of the annealing furnace and then falls into one side of the next layer under the action of the pipe feeding mechanism, and falls into the lower layer after being horizontally conveyed to the other side of the layer under the action of the pipe horizontal conveying mechanism until the plastic pipe reaches the bottommost layer according to the continuous S-layer route;
4) blanking of an annealing furnace: after the plastic pipe reaches the bottommost layer, the plastic pipe is conveyed to one side surface of the annealing furnace to be discharged under the action of a pipe discharging mechanism;
5) and finishing the annealing furnace process.
Further, in the step 1), the heated air circulation heating devices are symmetrically arranged at two sides of the furnace body of the annealing furnace, and the heated air circulation heating devices adopt an electric heating blowing heating mode.
Further, the tube feeding mechanism in the step 2) adopts a group of inverted L-shaped conveyor belts arranged along the axial direction of the plastic tube.
Further, the horizontal conveying mechanism for the pipes in the step 3) adopts a group of linear conveying belts arranged along the vertical direction.
Further, the pipe blanking mechanism in the step 4) adopts a group of inverted L-shaped conveyor belts arranged along the axial direction of the plastic pipe, and the pipe blanking mechanism and the pipe feeding mechanism are arranged on the same side of the annealing furnace in parallel.
Further, the internal temperature of the annealing furnace in the step 1) is controlled to be 90-100 ℃.
Further, the operation time of the plastic pipe in the annealing furnace is controlled to be 1-2 hours.
Further, the continuous annealing process for the plastic pipe is characterized in that the pipe feeding mechanism, the pipe discharging mechanism and the pipe horizontal conveying mechanism are supported on a shell of the annealing furnace through a main shaft and bearing assemblies arranged on two sides of the main shaft respectively.
The invention has the following beneficial effects:
1) the hot air circulation heating devices are symmetrically arranged on the two sides of the annealing furnace, so that air at the bottom of the annealing furnace can be heated in an electric heating blast mode and then conveyed into the annealing furnace from the top of the annealing furnace, the effect of heating by circulating hot air can be realized, the flowing of the air in the annealing furnace and the heating uniformity in the annealing furnace are ensured, and the annealing effect is improved; in addition, the hot air circulation heating device is arranged outside the annealing furnace, so that the space utilization rate in the furnace is improved, and a foundation is provided for the arrangement of a conveying system in the annealing furnace.
2) The automatic annealing process of the pipe can be realized by arranging the pipe feeding mechanism, the pipe horizontal conveying mechanism and the pipe discharging mechanism inside the annealing furnace, and under the action of the pipe horizontal conveying mechanism, the pipe can run inside the annealing furnace according to a continuous S-layer route, so that the annealing time is effectively guaranteed, and the annealing effect is further improved.
3) The continuous annealing process provided by the invention has the advantages of high automation degree, good heating uniformity in the annealing process, accurate control of annealing time, guarantee of the mechanical property of each pipe and improvement of the product quality.
Drawings
FIG. 1 is a schematic view of the installation structure of the heated air circulation heating apparatus of the present invention;
FIG. 2 is a schematic structural view of a heated air circulation heating apparatus according to the present invention;
FIG. 3 is a schematic view of the internal structure of the heated air circulation heating apparatus according to the present invention;
FIG. 4 is a schematic view of the installation structure of the continuous pipe conveying device of the present invention;
FIG. 5 is a schematic view of the overall structure of the continuous pipe conveying device according to the present invention;
FIG. 6 is a schematic structural view of a tube feeding mechanism according to the present invention;
FIG. 7 is a schematic structural view of a horizontal pipe conveying mechanism according to the present invention;
FIG. 8 is a schematic structural view of a tube blanking mechanism according to the present invention;
FIG. 9 is a schematic view of a lever mounting structure according to the present invention;
in the figure: 1-furnace body; 2-a pipe continuous conveying device; 21-a pipe feeding mechanism; 2101-first drive shaft; 2102-upper support shaft; 2103-lower support shaft; 2104-a first conveyor chain; 2105-a first driven shaft; 2106-stop lever; 22-a pipe blanking mechanism; 23-a pipe horizontal conveying mechanism; 2301-a second drive shaft; 2302-a second driven shaft; 2303-a second conveyor chain; 24-conveying the support frame; 25-longitudinal support frame; 26-a transverse support frame; 27-a bearing assembly; 28-a sprocket; 29-material blocking frame; 31-a drive motor; 32-a drive sprocket; 33-a tension sprocket; 34-a drive chain; 3-a drive mechanism; 4-a hot air circulation heating device; 401-an electric machine; 402-an air inlet section; 403-a heating section; 404-air outlet section; 405-a transmission assembly; 406-a spindle assembly; 407-fan blades; 408-heating tube; and 5-a steel support frame.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-9, a continuous annealing process for plastic pipes comprises the following steps:
1) and (3) cyclic heating of an annealing furnace: arranging a hot air circulation heating device on the annealing furnace, pumping air in the annealing furnace out of the side part of the annealing furnace, heating, and then sending the heated air into the annealing furnace from the top of the annealing furnace (the temperature in the annealing furnace is controlled at 90 ℃), so as to realize hot air circulation heating; the hot air circulation heating devices are symmetrically arranged at two sides of the furnace body of the annealing furnace, and adopt an electric heating blowing heating mode.
2) Feeding of an annealing furnace: sequentially lifting the plastic pipes to the top of the annealing furnace from the bottom of one side of the annealing furnace through a pipe feeding mechanism; the pipe feeding mechanism adopts a group of inverted L-shaped conveyor belts arranged along the axial direction of the plastic pipe.
3) Annealing of the annealing furnace: the plastic pipe enters the topmost layer after reaching the top of the annealing furnace, is horizontally conveyed to the other side of the annealing furnace and then falls into one side of the next layer under the action of the pipe feeding mechanism, and falls into the lower layer after being horizontally conveyed to the other side of the layer under the action of the pipe horizontal conveying mechanism until the plastic pipe reaches the bottommost layer according to the continuous S-layer route; the pipe horizontal conveying mechanism adopts a group of linear conveying belts arranged along the vertical direction.
4) Blanking of an annealing furnace: after the plastic pipe reaches the bottommost layer, the plastic pipe is conveyed to one side surface of the annealing furnace to be discharged under the action of a pipe discharging mechanism; the pipe blanking mechanism adopts a group of inverted L-shaped conveyor belts arranged along the axial direction of the plastic pipe, and the pipe blanking mechanism and the pipe feeding mechanism are arranged on the same side of the annealing furnace in parallel.
5) The operation time of the plastic pipe in the annealing furnace is controlled to be 1-2 hours (the specific time is 80 minutes by controlling the speed of the pipe continuous conveying device of the annealing furnace), and the working procedure of the annealing furnace is completed.
A plastic pipe continuous annealing furnace comprises a furnace body 1, a hot air circulation heating device 4 and a pipe continuous conveying device 2.
The furnace body 1 is fixedly arranged on the ground through a steel support frame 5, the hot air circulating heating devices 4 are symmetrically arranged at opposite positions on two sides of the furnace body 1, and the space in the furnace body 1 can be pumped out through the hot air circulating heating devices 4, heated and sent into the furnace body again; the pipe continuous conveying device 2 is arranged inside the furnace body 1, and the pipe can be fed, continuously annealed and discharged through the pipe continuous conveying device 2.
Specifically, heated air circulation heating device 4 includes circulating fan, circulation wind channel and heating pipe assembly, circulation wind channel one end is connected at 1 lateral part of furnace body, and the other end is connected at 1 top of furnace body, heating pipe assembly sets up inside circulation wind channel, circulating fan sets up on circulation wind channel, through circulating fan with the inside air of furnace body 1 after the heating pipe heating, send into the furnace body again by the furnace body top.
Specifically, the circulator blower comprises a motor 401, a transmission assembly 405, a spindle assembly 406 and a blower blade 407, wherein the blower blade 407 is connected with the spindle assembly 406, one end of the transmission assembly 405 is connected with the spindle assembly 406, and the other end of the transmission assembly 405 is connected with the motor 401.
Specifically, the circulating air duct includes an air inlet section 402, a heating section 403 and an air outlet section 404, the fan blade 407 is disposed at the air inlet section 402, and the heating pipe assembly is disposed at the heating section 403.
Specifically, the heating pipe assembly includes a plurality of heating pipes 408, and the heating pipes are U-shaped pipes and are horizontally disposed in a cavity of the heating section 403.
Specifically, the top surface and four side surfaces of the furnace body 1 are closed, and the bottom surface of the furnace body 1 is provided with openings (the openings are arranged at the positions corresponding to the pipe feeding mechanism 21 and the pipe blanking mechanism 22).
The pipe continuous conveying device 2 (plastic pipe continuous annealing furnace pipe conveying assembly) of the annealing furnace comprises a pipe feeding mechanism 21, a pipe horizontal conveying mechanism 23, a pipe blanking mechanism 22 and a driving mechanism 3, wherein the pipe feeding mechanism 21 is of an inverted L-shaped structure and can convey plastic pipes at the bottom to the top of the furnace body 1 along the side part of the furnace body 1, and the pipe horizontal conveying mechanism 23 is arranged between the pipe feeding mechanism 21 and the pipe blanking mechanism 22 and can enable the pipes to be continuously conveyed in an S shape in the furnace body 1 so as to realize continuous annealing operation; the pipe blanking mechanism 22 is of an inverted L-shaped structure and can send the plastic pipes passing through the pipe horizontal conveying mechanism 23 out from the bottom of the furnace body 1 to the side of the furnace body 1.
Specifically, tubular product unloading mechanism 22 is the same with tubular product feed mechanism 21 structure, all includes and carries support frame 24, carry support frame 24 one side to be equipped with first driving shaft 2101, be equipped with a set of sprocket 28 along its axial on the first driving shaft 2101, carry support frame 24 opposite side to be equipped with the back shaft, be equipped with a set of sprocket 28 along its axial on the back shaft, it is equipped with first driven shaft 2104 at the below position that is located back shaft one side to carry support 24 frame, be equipped with a set of sprocket 28 along its axial on the first driven shaft 2105, around being equipped with same root first transmission chain 2104 on the corresponding sprocket 28 of first driving shaft, back shaft and first driven shaft, equidistant shelves pole 2106 that sets up on the first transmission chain 2105.
Specifically, the support shafts are provided with two support shafts on one side of the conveying support frame 24 (since the operation of the conveying chain is a closed loop, the upper side and the lower side of the conveying chain need to be supported to ensure the stable operation), and each support shaft comprises an upper support shaft 2102 and a lower support shaft 2103 arranged below the upper support shaft 2102.
Specifically, bearing assemblies 27 are respectively arranged at two ends of the first driving shaft 2101, the upper supporting shaft 2102, the lower supporting shaft 2103 and the first driven shaft 2105, and are supported on the furnace body 1 through the bearing assemblies 27.
Specifically, the first conveying chain 2104 is provided at one end thereof on the sprocket 28 of the first driving shaft 2101 and at the other end thereof on the sprocket 28 of the first driven shaft 2105 after passing over the upper ends of the sprockets 28 of the upper and lower support shafts 2102 and 2103, thereby forming an L-shaped conveying loop.
Specifically, the blocking rod 2106 is obliquely arranged on the first conveying chain 2104, and an included angle between the blocking rod 2106 and the first conveying chain 2104 is an acute angle, so that the pipe can be conveniently positioned, and the plastic pipe can be fed and discharged under the action of the first conveying chain 2104.
The horizontal pipe conveying mechanism 23 comprises a conveying support frame 24, one side of the conveying support frame 24 is provided with a second driving shaft 2301, the other side of the conveying support frame is provided with a second driven shaft 2302, a group of chain wheels 28 are correspondingly arranged on the second driving shaft 2301 and the second driven shaft 2302 along the axial direction, a second conveying chain 2303 is wound between the second driving shaft 2301 and the second driven shaft 2302, and the second conveying chain 2303 is provided with shift rods 2106 at equal intervals.
Specifically, bearing assemblies 27 are respectively disposed at both ends of the second driving shaft 2301 and the second driven shaft 2302, and are supported on the furnace body 1 through the bearing assemblies 27.
Specifically, the conveying support frame 24 comprises a longitudinal support frame 25 and a transverse support frame 26, a group of the longitudinal support frames 25 are arranged at intervals and in parallel, a group of the transverse support frames 26 are arranged at intervals and in parallel and vertically penetrate through the longitudinal support frame 25, and two ends of the transverse support frame 26 are respectively supported on the furnace body 1.
Specifically, material blocking frames 29 (in a continuous C-shaped structure) are respectively arranged on two sides of the pipe feeding mechanism 21, the pipe discharging mechanism 22 and the pipe horizontal conveying mechanism 23 inside the furnace body 1, so that pipes can enter the pipe horizontal conveying mechanism 23 from the pipe feeding mechanism 2, the pipes can be continuously conveyed in an S-shaped manner on the pipe horizontal conveying mechanism 23, and the pipes can enter the pipe discharging mechanism 22 from the pipe horizontal conveying mechanism 23.
The driving mechanism 3 comprises a driving motor 31, a driving chain wheel 32, a tensioning chain wheel 33 and a driving chain 34, the driving motor 31 is arranged on the outer wall of the furnace body 1, the driving chain wheel 33 is respectively arranged at one end of an output shaft of the driving motor, a first driving shaft of the pipe feeding mechanism, a second driving shaft of the pipe horizontal conveying mechanism and a first driving shaft of the pipe blanking mechanism, the tensioning chain wheel 33 is arranged on the furnace body 1, and the driving chain 34 is wound on the driving chain wheel 32 and the tensioning chain wheel 33, so that the pipe feeding mechanism 21, the pipe horizontal conveying mechanism 23 and the pipe blanking mechanism 22 are driven by the driving motor 31 to work simultaneously.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (8)
1. A continuous annealing process for plastic pipes is characterized by comprising the following steps:
1) and (3) cyclic heating of an annealing furnace: arranging a hot air circulation heating device on the annealing furnace, pumping air in the annealing furnace out of the side part of the annealing furnace, heating, and then sending the heated air into the annealing furnace from the top part of the annealing furnace to realize hot air circulation heating;
2) feeding of an annealing furnace: sequentially lifting the plastic pipes to the top of the annealing furnace from the bottom of one side of the annealing furnace through a pipe feeding mechanism;
3) annealing of the annealing furnace: the plastic pipe enters the topmost layer after reaching the top of the annealing furnace, is horizontally conveyed to the other side of the annealing furnace and then falls into one side of the next layer under the action of the pipe feeding mechanism, and falls into the lower layer after being horizontally conveyed to the other side of the layer under the action of the pipe horizontal conveying mechanism until the plastic pipe reaches the bottommost layer according to the continuous S-layer route;
4) blanking of an annealing furnace: after the plastic pipe reaches the bottommost layer, the plastic pipe is conveyed to one side surface of the annealing furnace to be discharged under the action of a pipe discharging mechanism;
5) and finishing the annealing furnace process.
2. The plastic pipe continuous annealing process according to claim 1, wherein the hot air circulation heating devices in step 1) are symmetrically arranged at two sides of the annealing furnace body, and the hot air circulation heating devices adopt an electric heating blowing heating mode.
3. The continuous annealing process for plastic pipes as claimed in claim 1, wherein the pipe feeding mechanism in step 2) employs a set of inverted L-shaped conveyor belts arranged along the axial direction of the plastic pipes.
4. The plastic pipe continuous annealing process according to claim 1, wherein the horizontal conveying mechanism for the pipes in the step 3) adopts a set of linear conveyor belts arranged along a vertical direction.
5. The continuous annealing process for plastic pipes as claimed in claim 1, wherein the pipe blanking mechanism in step 4) is a set of inverted L-shaped conveyor belts arranged along the axial direction of the plastic pipes, and the pipe blanking mechanism and the pipe feeding mechanism are arranged in parallel on the same side of the annealing furnace.
6. The continuous annealing process for plastic pipes as claimed in claim 1, wherein the temperature inside the annealing furnace in step 1) is controlled to be 90-100 ℃.
7. The continuous annealing process for plastic pipes as claimed in claim 1, wherein the operation time of the plastic pipes in the annealing furnace is controlled to be 1-2 hours.
8. The plastic pipe continuous annealing process according to claim 1, wherein the pipe feeding mechanism, the pipe discharging mechanism and the pipe horizontal conveying mechanism are respectively supported on a shell of the annealing furnace through a main shaft and bearing assemblies arranged on two sides of the main shaft.
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| CN202210577406.0A CN114953524B (en) | 2022-05-25 | 2022-05-25 | Continuous annealing process for plastic pipe |
| CN202210596648.4A CN115416334A (en) | 2022-05-25 | 2022-05-25 | Plastic pipe continuous annealing furnace and annealing process thereof |
| CN202210599965.1A CN115418466B (en) | 2022-05-25 | 2022-05-25 | Pipe transmission assembly of plastic pipe continuous annealing furnace |
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| CN202210577406.0A CN114953524B (en) | 2022-05-25 | 2022-05-25 | Continuous annealing process for plastic pipe |
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| CN202210599965.1A Division CN115418466B (en) | 2022-05-25 | 2022-05-25 | Pipe transmission assembly of plastic pipe continuous annealing furnace |
| CN202210596648.4A Division CN115416334A (en) | 2022-05-25 | 2022-05-25 | Plastic pipe continuous annealing furnace and annealing process thereof |
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| CN202210599965.1A Active CN115418466B (en) | 2022-05-25 | 2022-05-25 | Pipe transmission assembly of plastic pipe continuous annealing furnace |
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| CN115418466B (en) | 2024-02-13 |
| CN114953524B (en) | 2024-06-11 |
| CN115416334A (en) | 2022-12-02 |
| CN115418466A (en) | 2022-12-02 |
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