CN114160390B - Production process of pipe fitting inner coating - Google Patents
Production process of pipe fitting inner coating Download PDFInfo
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- CN114160390B CN114160390B CN202111373077.XA CN202111373077A CN114160390B CN 114160390 B CN114160390 B CN 114160390B CN 202111373077 A CN202111373077 A CN 202111373077A CN 114160390 B CN114160390 B CN 114160390B
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- pipe fitting
- negative pressure
- material conveying
- fitting workpiece
- accommodating cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/005—Apparatus specially designed for applying particulate materials to the inside of hollow work
- B05C19/007—Apparatus specially designed for applying particulate materials to the inside of hollow work for applying the particulate materials to the inside of hollow tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/06—Storage, supply or control of the application of particulate material; Recovery of excess particulate material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
- B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
- B05D1/24—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
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- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention provides a pipe fitting inner coating production process, which comprises the following steps: a fluidized bed preparation step, a negative pressure device starting step, a pipe fitting workpiece preparation step, a pipe fitting workpiece inner coating forming step and a material recovery step; in the step of forming the inner coating of the pipe fitting workpiece, the negative pressure tank is communicated with the pipe fitting workpiece, so that the pressure in the inner cavity of the pipe fitting workpiece is equal to the pressure in the negative pressure tank, and the inner cavity of the pipe fitting workpiece is in a negative pressure state; the fluid powder in the fluidized bed is rapidly filled into the pipe fitting workpiece and rapidly melted by the heat of the pipe fitting workpiece to form an anti-corrosion layer. The production process is simple to operate and convenient to use, and the corrosion resistance layer produced by the method has uniform thickness and high production rate; no dependence on human skills; one device can replace 3-4 operators, and if one device works for 8-9 hours a day, 2000 elbow pipe fittings are produced, so that the production cost is greatly saved; the powder does not fly to the operation room of workers, and the environment protection performance is strong.
Description
Technical Field
The invention relates to the technical field of inner coating forming processes of pipe fittings, cylinder bodies, box bodies and the like, in particular to a pipe fitting inner coating production process.
Background
Most of the drinking water in China is conveyed by adopting a buried conveying pipeline, so that very high requirement standards for the quality, corrosion resistance and the like of the pipeline are provided, and particularly, the requirements on the corrosion resistance of the inner wall of the pipeline are very strict. The current general means for corrosion resistance is to carry out corrosion resistance treatment on the inner walls of pipelines, elbows, three-way pipes, reducer pipes, flanges and the like, and most of the corrosion resistance layers are formed by spraying corrosion resistance layers on the inner walls of pipe fittings, wherein the corrosion resistance layers are epoxy resin (EP) or Polyethylene (PE).
The traditional mode is as follows: taking an elbow as an example, one end of the elbow is plugged by an end cover after heating, anti-corrosion powder is put in, then the other end of the elbow is plugged by the end cover, an operator takes a heat insulation glove, shakes the overturning elbow back and forth, and the powder is melted on the inner wall to form the anti-corrosion inner wall. By adopting the production mode, the pipe fitting has various defects, namely, after being heated at high temperature, operators can scald hands even wearing the heat-insulating gloves; secondly, the redundant powder in the elbow needs to be poured out, so that the speed is low and the efficiency is low; thirdly, employment of workers is high in production cost; fourthly, continuous shaking is needed to ensure the uniformity of the inner wall anti-corrosion coating, so the working strength is high and the working efficiency is low, and if a man works for 8 to 9 hours each day, 500 men can be completed.
With the progress of technology, the mode of spraying the inner wall of the pipe fitting by adopting the spray gun is developed, however, when the spray gun is used for working, dry powder is easy to fly, and the thickness of the anti-corrosion inner wall formed by adopting the mode is uneven; furthermore, the spray gun has extremely low powder yield, and generally sprays 1-square air, wherein only 2% -3% of powder is contained, so that the spray gun needs a long time to form an anti-corrosion layer, and the spraying efficiency is extremely low.
There are also methods of pressing flowing powder into a tube by positive pressure, and production processes and production equipment using such methods have not been realized.
Therefore, a pipe fitting inner coating production process which is high in efficiency, uniform in thickness of the generated anti-corrosion inner wall and environment-friendly is urgently needed.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a pipe fitting inner coating production process, and the thickness of the formed anti-corrosion layer is uniform; the production rate is high; no dependence on human skills; one device can replace 3-4 operators, so that the production cost is greatly saved; the powder does not fly to the operation room of workers, and the environment protection performance is strong.
In order to achieve the above object, the present invention provides a process for producing an inner coating of a pipe, comprising the steps of: a fluidized bed preparation step, a negative pressure device starting step, a pipe fitting workpiece preparation step, a pipe fitting workpiece inner coating forming step and a material recovery step;
in the step of forming the inner coating of the pipe fitting workpiece, the negative pressure tank is communicated with the pipe fitting workpiece, so that the pressure in the inner cavity of the pipe fitting workpiece is equal to the pressure in the negative pressure tank and is in a negative pressure state; the fluid powder in the fluidized bed is rapidly filled into the pipe fitting workpiece and rapidly melted by the heat of the pipe fitting workpiece to form an anti-corrosion layer.
As a preferable technical scheme, the fluid powder in the fluidized bed 3 is filled into the pipe fitting workpiece in 0.2-0.5 seconds.
As the preferable technical scheme, the negative pressure tank is disconnected from the pipe fitting workpiece, so that the pressure in the inner cavity of the pipe fitting workpiece is changed into normal atmospheric pressure, the inner cavity of the pipe fitting workpiece is changed into a normal pressure state instantaneously, redundant fluid powder in the pipe fitting workpiece falls into the fluidized bed, and the residual fluid powder on the inner wall of the pipe fitting workpiece is continuously melted by means of the waste heat of the pipe fitting workpiece until a smooth corrosion-resistant layer is formed.
As a preferable technical scheme, the material recovery step: the fluid powder in the negative pressure tank enters the material conveying device;
when the first material conveying and accommodating cavity moves to a connecting port of the negative pressure tank and the piston device, the first material conveying and accommodating cavity is communicated with the negative pressure tank, a negative pressure state is formed in the first material conveying and accommodating cavity, the pressure in the first material conveying and accommodating cavity is equal to the pressure in the negative pressure tank, fluid powder automatically enters the first material conveying and accommodating cavity, and the second material conveying and accommodating cavity is in a normal pressure state;
as a preferable technical solution, in the material recovery step: when the second material conveying and accommodating cavity moves to the connecting port of the negative pressure tank and the piston device, the second material conveying and accommodating cavity is communicated with the negative pressure tank, a negative pressure state is formed in the second material conveying and accommodating cavity, the pressure in the second material conveying and accommodating cavity is equal to the pressure in the negative pressure tank, fluid powder automatically enters the second material conveying and accommodating cavity, the first material conveying and accommodating cavity is in a normal pressure state, powder in the first material conveying and accommodating cavity falls into a corresponding guide pipe under the action of gravity and enters the spiral pushing device, and the spiral pushing device conveys dry powder to a feed back port of the fluidized bed.
As a preferable technical solution, the negative pressure device starting step: and starting the induced draft fan to form a negative pressure state in the negative pressure tank.
As the preferable technical scheme, in the step of starting the negative pressure device, the pressure value in the negative pressure tank is-0.05-0 MPa.
As a preferable embodiment, the pipe fitting workpiece preparing step: and placing the heated pipe fitting workpiece into a positioning ring on a re-working table, enabling the feeding end of the pipe fitting workpiece to be communicated with a fluidized bed, and waiting to be processed, wherein the temperature of the pipe fitting workpiece is 140-280 ℃.
As a preferred technical solution, the fluidized bed preparation step comprises: introducing air into the fluidized bed to form fluid powder from the dry powder in the fluidized bed.
In the fluidized bed preparation step, the fluid powder is in a mixed state of air and dry powder, the volume ratio of the air to the dry powder in the fluid powder is 2-3:7-8, and the particle size of the dry powder is 40-80 meshes.
The invention provides an operation method of pipe fitting inner coating negative pressure production equipment, the corrosion resistant layer produced by the method has uniform thickness and high production rate; no dependence on human skills; one device can replace 3-4 operators, and if one device works for 8-9 hours a day, 2000 elbow pipe fittings are produced, so that the production cost is greatly saved; the powder does not fly to the operation room of workers, and the environment protection performance is strong.
Drawings
FIG. 1 is a schematic view of the negative pressure production equipment for the inner coating of the pipe fitting;
FIG. 2 is a schematic view of the construction of the side plate of the removed portion of the pipe fitting internal coating negative pressure production apparatus of the present invention;
FIG. 3 is a schematic view of the structure of a two elbow connection of the present invention;
FIG. 4 is a schematic view of the structure of the fluidized bed of the present invention;
FIG. 5 is a front view of the fluidized bed of the present invention;
FIG. 6 is a schematic structural view of the negative pressure tank of the present invention;
FIG. 7 is a front view of the negative pressure tank of the present invention;
FIG. 8 is a schematic view of the structure of the material conveying device of the present invention;
FIG. 9 is a schematic view of the structure of the material conveying device of the present invention with a part of the housing removed;
FIG. 10 is a schematic view of the piston assembly of the present invention;
FIG. 11 is a schematic view of the structure of the screw pushing assembly of the present invention;
FIG. 12 is a perspective view of a tube separation device of the present invention;
FIG. 13 is a front view of the tube sorting apparatus of the present invention;
FIG. 14 is a step diagram of the process for producing an inner coating of a pipe according to the present invention;
FIG. 15 is a step diagram of a pipe work piece inner coating formation step;
FIG. 16 is a step diagram of a material recovery step;
1-negative pressure tank, 11-tank powder inlet, 12-blowback air bag, 13-tank joint, 2-material conveying device, 21-piston device, 22-spiral pushing device, 23-piston assembly, 231-shaft, 232-first piston group, 233-second piston group, 234-connecting nut, 24-spiral pushing assembly, 25-cylinder, 26-stud, 27-speed reducer, 28-conduit, 29-material conveying accommodation cavity, 291-first material conveying accommodation cavity, 292-second material conveying accommodation cavity, 3-fluidized bed, 31-retainer ring, 32-cover plate, 33-return opening, 34-barrel joint, 35-base, 36-upper barrel, 37-three-layer filter cloth, 4-branch pipe device, 41-main pipe joint, 42-branch pipe joint, 43-valve, 44-main pipe, 5-induced draft fan, 6-compressed air dryer, 7-second hose, 8-pipe fitting, 9-first hose joint, 10-first hose joint.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 13, the invention provides a pipe internal coating negative pressure production device, which comprises a fluidized bed 3, a workbench, a negative pressure device and a material conveying device 2.
The fluidized bed 3 is used for containing dry powder, and after the fluidized bed 3 is filled with air, the dry powder is in a fluid state, so that the fluidized powder has very good fluidity.
The fluid powder is in a mixed state of air and dry powder, the volume ratio of the air to the dry powder in the fluid powder is 2-3:7-8, and the particle size of the dry powder is 6-8 mm.
The workbench is positioned above the fluidized bed 3 and is used for placing pipe fitting machined parts 8, and the negative pressure device can be communicated with the pipe fitting machined parts 8 on the workbench. The negative pressure device is adopted to realize the rapid filling of the fluid powder into the pipe fitting workpiece 8 and the rapid melting of the fluid powder forms an anti-corrosion layer on the inner wall of the pipe fitting workpiece 8.
The negative pressure device is also communicated with the material conveying device 2, the material conveying device 2 is communicated with the fluidized bed 3, when an anti-corrosion layer is formed on the inner wall of the pipe fitting machined part 8, part of fluid powder enters the negative pressure device, and then enters the fluidized bed 3 through the material conveying device 2, so that the recovery of dry powder is realized.
The air needs to pass through the compressed air dryer 6 and the cooling device before entering the fluidized bed 3. The compressed air dryer and the cooling device are separated in no sequence, and the purpose is to remove water and cool the air entering the fluidized bed 3 so as to ensure that the dry powder in the fluidized bed 3 is not melted to become pasty and is not stuck on the inner wall of the fluidized bed 3.
The negative pressure device comprises a negative pressure tank 1 and an induced draft fan 5, and the negative pressure tank 1 is communicated with the induced draft fan 5. Specifically, a tank body joint 13 is arranged at the top of the negative pressure tank 1, the tank body joint 13 can be an elbow joint, the tank body joint 13 is communicated with the induced draft fan 5 through a pipeline, and after the induced draft fan 5 is started, the pressure in the negative pressure tank 1 is in a negative pressure state. In order to ensure that fluid powder in the negative pressure tank 1 is not adhered to a filter screen in the negative pressure tank 1, a back-blowing air bag 12 is arranged at the top of the negative pressure tank 1, and the back-blowing air bag 12 intermittently carries out back-blowing air treatment on the negative pressure tank 1 under the control of an electromagnetic valve.
The induced draft fan 5 is a variable frequency vortex type air pump with the frequency of 50Hz, and the variable frequency adjustment range is 0-70 Hz. During operation, the fluidized bed 3 communicates the feed end of pipe fitting machined part 8, the discharge end of pipe fitting machined part 8 passes through first hose connector 10, first hose 9 and divides tub device intercommunication negative pressure jar 1, and the feed connection port of pipe fitting machined part 8 is greater than the discharge connection port of pipe fitting machined part 8 far away, makes fluid form powder form the state of fast-in slow-out to the inner chamber of pipe fitting machined part 8 is filled fast, forms smooth corrosion resistant layer on the inner wall of pipe fitting machined part 8.
When the device is used, the feeding end of the single pipe fitting workpiece 8 can be connected with the fluidized bed 3, the discharging end of the single pipe fitting workpiece 8 is communicated with the first hose connector 10 for working, and two or even a plurality of pipe fitting workpieces 8 can be connected together to form a relatively large workpiece for processing. Taking the elbow pipe as an example, for convenience of operation, a finished elbow pipe may be placed in a positioning ring 31, the elbow pipe to be processed is placed on the finished elbow pipe, and the other end of the elbow pipe to be processed is connected to the first hose connector 10 for operation. As shown in fig. 3, a finished elbow fitting and an elbow fitting head to be machined are connected in a staggered manner.
The pipe fitting machined parts 8 comprise a straight pipe, a three-way pipe, an elbow, a reducer pipe, a flange and the like; other pipe bodies, cylinder bodies, box bodies and other workpieces with layered inner surfaces can be used.
The bottom of the negative pressure tank 1 is communicated with a material conveying device 2. The material conveying device 2 comprises a piston device 21 and a spiral pushing device 22, and two guide pipes 28 are arranged at the bottom of the piston device 21 and are communicated with the spiral pushing device. The top of the piston device 21 is fastened and connected to the bottom of the negative pressure tank 1 through flanges, bolts and nuts.
The piston device 21 comprises a pipe wall and a piston assembly 23 arranged in the pipe wall, the piston assembly 23 comprises a shaft 231, a first piston group 232 and two second piston groups 233 are sleeved on the shaft 231, and the first piston group 232 comprises at least one piston, and preferably two pistons are arranged; the second piston group 233 comprises at least one piston, preferably two pistons. The first piston group 232 is disposed at a middle position of the shaft 231, and the two second piston groups 233 are symmetrically disposed at both sides of the first piston group 232. Two material-conveying accommodating chambers 29, namely a first material-conveying accommodating chamber 291 and a second material-conveying accommodating chamber 292, are formed between the pipe wall and one first piston group 232 and two second piston groups 233.
The piston assembly 23 is connected with the cylinder 25, specifically, one end of the shaft 231 is provided with a connecting nut 234, the connecting nut 234 is used for connecting with the cylinder 25, and a stud 26 is arranged between the cylinder 25 and the piston device 23.
The screw pushing device 22 comprises a shell and a screw pushing assembly 24, and the screw pushing assembly 24 is connected with a speed reducer 27.
When fluid powder enters the piston device 21 from the negative pressure tank 1, the piston assembly 23 moves left and right under the action of the air cylinder 25, and when the first material conveying and accommodating cavity 291 moves to a connection port of the negative pressure tank 1 and the piston device 21, the first material conveying and accommodating cavity 291 is communicated with the negative pressure tank 1, a negative pressure state is formed in the first material conveying and accommodating cavity 291, at the moment, the pressure in the first material conveying and accommodating cavity 291 is equal to the pressure in the negative pressure tank 1, fluid powder automatically enters the first material conveying and accommodating cavity 291, and at the moment, the second material conveying and accommodating cavity 292 is in a normal pressure state; along with the driving action of the air cylinder 25, the second material conveying and accommodating cavity 292 moves to the connection port of the negative pressure tank 1 and the piston device 21, at this time, the second material conveying and accommodating cavity 292 is communicated with the negative pressure tank 1, a negative pressure state is formed in the second material conveying and accommodating cavity 292, at this time, the pressure in the second material conveying and accommodating cavity 292 is equal to the pressure in the negative pressure tank 1, fluid powder automatically enters the second material conveying and accommodating cavity 292, at this time, the first material conveying and accommodating cavity 291 is in a normal pressure state, the powder in the first material conveying and accommodating cavity 291 falls into the corresponding guide pipe 28 under the action of gravity and enters the spiral pushing device 22, the outlet end of the spiral pushing device 22 is connected to the feed back port 33 of the fluidized bed 3, and finally the powder enters the fluidized bed 3, so circulation is realized, and recovery of the powder is realized.
In this equipment, fluidized bed 3 includes staving 36 and is located the base 35 of staving 36 bottom, base 35 passes through flange, bolt and nut to be fixed on last staving 36, is provided with three-layer filter cloth 37 between base 35 and the last staving 36, be provided with staving joint 34 on the base 35, staving joint 34 is used for inserting the air after dewatering, cooling.
The top of the upper barrel 36 is provided with a cover plate 32, the cover plate 32 is provided with at least two positioning rings 31 and a plurality of holes, and the diameter of each positioning ring 31 is different, so that the upper barrel is suitable for pipe fittings with various pipe diameters. When the pipe fitting needs to be processed, one of the positioning rings 31 can be selected according to the pipe diameter of the pipe fitting, and the pipe fitting workpiece 8 with the pipe diameter matched with the positioning ring 31 is placed in the pipe fitting, and in the drawing of the patent, an elbow pipe fitting is taken as an example.
The first hose connector 10 is connected to the branch pipe device 4 through a first hose 9, and the branch pipe device 4 is connected to a tank body powder inlet 11 at the lower part of the side wall of the negative pressure tank 1 through a second hose 7.
The first hose 9 is used for conveying fluid powder in the pipe fitting workpiece 8 to the pipe branching device 4, and the second hose 7 is used for conveying fluid powder in the pipe branching device 4 to the negative pressure tank 1.
The pipe separating device 4 comprises a main pipe 44 and branch pipe joints 42 connected to the main pipe 44, at least two branch pipe joints 42 are arranged, a valve 43 is arranged on each branch pipe joint 42, a main pipe joint 41 is further arranged on the main pipe 44, and the main pipe joint 41 is used for connecting the second hose 7. At least two branch pipe joints 42 are provided for adapting to the pipe diameters of different pipe work pieces 8.
The invention provides negative pressure production equipment for an inner coating of a pipe fitting, which is characterized in that the thickness of the formed anti-corrosion layer is uniform; the production rate is high; no dependence on human skills; one device can replace 3-4 operators, and if one device works for 8-9 hours a day, 2000 elbow pipe fittings are produced, so that the production cost is greatly saved; the powder does not fly to the operation room of workers, and the environment protection performance is strong.
Referring to fig. 14 to 16, the present invention also provides a process for producing an inner coating of a pipe, comprising the steps of: a fluidized bed preparation step, a negative pressure device starting step, a pipe fitting work piece preparation step, a pipe fitting work piece inner coating forming step and a material recovery step.
Firstly, performing a fluidized bed preparation step and a negative pressure device starting step, wherein the fluidized bed preparation step and the negative pressure device starting step can be performed simultaneously or separately; and then carrying out a pipe fitting workpiece preparation step, a pipe fitting workpiece inner coating forming step and a material recovery step.
The fluidized bed preparation step comprises the following steps: air is introduced into the fluidized bed 3 to form fluid powder from the dry powder in the fluidized bed 3.
The fluid powder is in a mixed state of air and dry powder, the volume ratio of the air to the dry powder in the fluid powder is 2-3:7-8, and the particle size of the dry powder is 40-80 meshes.
The negative pressure device starting step: the induced draft fan 5 is started to form a negative pressure state in the negative pressure tank 1, the pressure value in the negative pressure tank 1 is-0.05-0 MPa, and the pressure value in the negative pressure tank 1 is preferably-0.02 MPa.
The induced draft fan 5 is a variable frequency vortex type air pump with the frequency of 50Hz, and the variable frequency adjustment range is 0-70 Hz.
The pipe fitting work preparation step: and placing the heated pipe fitting workpiece 8 into a positioning ring 31 on a re-workbench, and enabling the feeding end of the pipe fitting workpiece 8 to be communicated with the fluidized bed 3, wherein the temperature of the pipe fitting workpiece 8 is 140-280 ℃ at the moment of processing.
The pipe fitting workpiece inner coating forming step comprises the following steps of:
starting at step S101:
step S101: starting the material conveying device 2 and executing step S102;
step S102: in the step of forming the inner coating of the pipe fitting workpiece, the negative pressure tank 1 is communicated with the pipe fitting workpiece 8, so that the pressure in the inner cavity of the pipe fitting workpiece 8 is equal to the pressure in the negative pressure tank 1, and the inner cavity is in a negative pressure state; the fluid powder in the fluidized bed 3 is rapidly filled into the pipe work piece 8 and rapidly melted by the heat of the pipe work piece 8 to form an anti-corrosion layer.
Specifically, the first hose connector 10 is buckled on the top of the pipe fitting machined part 8, so that the pipe fitting machined part 8 is communicated with the negative pressure tank 1 through the first hose connector 10, the first hose 9 and the pipe separating device, and the inner cavity pressure of the pipe fitting machined part 8 is equal to the pressure in the negative pressure tank 1 and is in a negative pressure state;
at this time, the fluid powder in the fluidized bed 3 is filled into the pipe fitting workpiece 8 in 0.2-0.5 seconds, and is rapidly melted by the heat of the pipe fitting workpiece 8, and part of the fluid powder enters the first hose connector 10 to execute step S103;
step S103: the negative pressure tank 1 is disconnected from the pipe fitting workpiece 8, so that the pressure in the inner cavity of the pipe fitting workpiece 8 is changed into normal atmospheric pressure, the inner cavity of the pipe fitting workpiece 8 is changed into a normal pressure state instantaneously, redundant fluid powder in the pipe fitting workpiece 8 falls into the fluidized bed 3, and residual fluid powder on the inner wall of the pipe fitting workpiece 8 is continuously melted by means of the waste heat of the pipe fitting workpiece 8 until a smooth corrosion-resistant layer is formed.
Specifically, the first hose connector 10 is removed from the pipe fitting workpiece 8, the inner cavity of the pipe fitting workpiece 8 is changed into a normal pressure state instantaneously, redundant fluid powder in the pipe fitting workpiece 8 falls into the fluidized bed 3 under the action of gravity, after the pipe fitting workpiece 8 is removed from the workbench, the residual fluid powder on the inner wall of the pipe fitting workpiece 8 is continuously melted by means of the residual heat of the pipe fitting workpiece 8 until a smooth corrosion-resistant layer is formed, and the processing of one pipe fitting workpiece 8 can be completed only by 5-10 seconds;
in the step S102, the top powder outlet of the pipe fitting workpiece 8 is the inlet of the first hose 9, the pipe diameter of the first hose 9 is far smaller than the bottom powder inlet caliber of the pipe fitting workpiece 8, the bottom powder inlet caliber of the pipe fitting workpiece 8 can enable the fluid powder to quickly enter and fill the inner cavity of the pipe fitting workpiece 8, the top powder outlet of the pipe fitting workpiece 8 can enable the fluid powder to slowly flow out, the fluid powder in the pipe fitting workpiece 8 is enabled to form a quick-in and slow-out state, so that the fluid powder in the pipe fitting workpiece 8 reaches a relatively stable state, a small amount of powder enters the negative pressure tank 1, after a plurality of pipe fitting workpieces 8 are continuously processed, the level of the fluid powder in the fluidized bed 3 is reduced, and dry powder can be poured into the fluidized bed 3 through the positioning ring 31 to maintain the constant level of the fluid powder in the fluidized bed 3.
The material recovery step comprises the following steps: part of the fluid powder in the pipe work piece 8 enters the negative pressure tank 1 via the first hose connection 10, the first hose 9 and the branching device and enters the material conveying device 2 via the bottom outlet of the negative pressure tank 1.
Specifically, when the fluid powder enters the piston device 21 from the negative pressure tank 1, the piston assembly 23 moves left and right under the action of the cylinder 25, and when the first material conveying and accommodating cavity 291 moves to the connection port of the negative pressure tank 1 and the piston device 21, the first material conveying and accommodating cavity 291 is communicated with the negative pressure tank 1, a negative pressure state is formed in the first material conveying and accommodating cavity 291, at the moment, the pressure in the first material conveying and accommodating cavity 291 is equal to the pressure in the negative pressure tank 1, the fluid powder automatically enters the first material conveying and accommodating cavity 291, and at the moment, the second material conveying and accommodating cavity 292 is in a normal pressure state; along with the driving action of the air cylinder 25, the second material conveying and accommodating cavity 292 moves to the connection port of the negative pressure tank 1 and the piston device 21, at this time, the second material conveying and accommodating cavity 292 is communicated with the negative pressure tank 1, a negative pressure state is formed in the second material conveying and accommodating cavity 292, at this time, the pressure in the second material conveying and accommodating cavity 292 is equal to the pressure in the negative pressure tank 1, fluid powder automatically enters the second material conveying and accommodating cavity 292, at this time, the first material conveying and accommodating cavity 291 is in a normal pressure state, the powder in the first material conveying and accommodating cavity 291 falls into the corresponding guide pipe 28 under the action of gravity and enters the spiral pushing device 22, the outlet end of the spiral pushing device 22 is connected to the feed back port 33 of the fluidized bed 3, and finally the powder enters the fluidized bed 3, so circulation is realized, and recovery of the powder is realized.
The invention provides a production process of an inner coating of a pipe fitting, which is simple to operate and convenient to use, and the corrosion-resistant layer produced by the method has uniform thickness and high production rate; no dependence on human skills; one device can replace 3-4 operators, and if one device works for 8-9 hours a day, 2000 elbow pipe fittings are produced, so that the production cost is greatly saved; the powder does not fly to the operation room of workers, and the environment protection performance is strong.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. The production process of the pipe fitting inner coating is characterized by comprising the following steps of: a fluidized bed preparation step, a negative pressure device starting step, a pipe fitting workpiece preparation step, a pipe fitting workpiece inner coating forming step and a material recovery step;
the fluidized bed preparation step: introducing air into the fluidized bed (3) to form fluid powder from dry powder in the fluidized bed (3); the fluid powder is in a mixed state of air and dry powder, the volume ratio of the air to the dry powder in the fluid powder is 2-3:7-8, and the particle size of the dry powder is 40-80 meshes;
the negative pressure device starting step: starting an induced draft fan (5) to form a negative pressure state in the negative pressure tank (1), wherein the pressure value in the negative pressure tank (1) is-0.05-0 MPa;
in the step of forming the inner coating of the pipe fitting workpiece, the negative pressure tank (1) is communicated with the pipe fitting workpiece (8), so that the inner cavity pressure of the pipe fitting workpiece (8) is equal to the inner pressure of the negative pressure tank (1), and the inner cavity pressure is in a negative pressure state; the fluid powder in the fluidized bed (3) is rapidly filled into the pipe fitting workpiece (8) and is rapidly melted by the heat of the pipe fitting workpiece (8) to form an anti-corrosion layer;
the negative pressure tank (1) is disconnected from the pipe fitting workpiece (8), so that the pressure of the inner cavity of the pipe fitting workpiece (8) is changed into normal atmospheric pressure, the inner cavity of the pipe fitting workpiece (8) is changed into a normal pressure state instantaneously, redundant fluid powder in the pipe fitting workpiece (8) falls into the fluidized bed (3), and the residual fluid powder on the inner wall of the pipe fitting workpiece (8) is continuously melted by virtue of the residual heat of the pipe fitting workpiece (8) until a smooth corrosion-resistant layer is formed;
the fluid powder in the fluidized bed (3) is filled into a pipe fitting workpiece (8) within 0.2-0.5 seconds;
the material recovery step comprises the following steps: the fluid powder in the negative pressure tank (1) enters the material conveying device (2); the bottom of the negative pressure tank (1) is communicated with the material conveying device (2), the material conveying device (2) comprises a piston device (21) and a spiral pushing device (22), two guide pipes (28) are arranged at the bottom of the piston device (21) and are communicated with the spiral pushing device (22), the outlet end of the spiral pushing device (22) is connected to the fluidized bed (3), the piston device (21) comprises a pipe wall and a piston assembly (23) arranged in the pipe wall, the piston assembly (23) comprises a shaft (231), a first piston group (232) and two second piston groups (233) are sleeved on the shaft (231), the first piston group (232) is arranged at the middle position of the shaft (231), the two second piston groups (233) are symmetrically arranged at two sides of the first piston group (232), and two material conveying accommodating cavities (29) are formed between the pipe wall and one first piston group (232) and the two second piston groups (233) and are respectively a first material conveying accommodating cavity (291) and a second material conveying cavity (292); the piston assembly (23) is connected with the air cylinder (25), a connecting nut (234) is arranged at one end of the shaft (231), the connecting nut (234) is used for connecting the air cylinder (25), and a stud (26) is arranged between the air cylinder (25) and the piston device (21);
when the first material conveying and accommodating cavity (291) moves to a connection port of the negative pressure tank (1) and the piston device (21), the first material conveying and accommodating cavity (291) is communicated with the negative pressure tank (1), a negative pressure state is formed in the first material conveying and accommodating cavity (291), at the moment, the pressure in the first material conveying and accommodating cavity (291) is equal to the pressure in the negative pressure tank (1), fluid powder automatically enters the first material conveying and accommodating cavity (291), and at the moment, the second material conveying and accommodating cavity (292) is in a normal pressure state;
when the second material conveying and accommodating cavity (292) moves to the connection port of the negative pressure tank (1) and the piston device (21), the second material conveying and accommodating cavity (292) is communicated with the negative pressure tank (1), a negative pressure state is formed in the second material conveying and accommodating cavity (292), the pressure in the second material conveying and accommodating cavity (292) is equal to the pressure in the negative pressure tank (1), fluid powder automatically enters the second material conveying and accommodating cavity (292), the first material conveying and accommodating cavity (291) is in a normal pressure state, the powder in the first material conveying and accommodating cavity (291) falls into a corresponding guide pipe (28) and enters the spiral pushing device (22), and the spiral pushing device (22) conveys dry powder to a feed back port (33) of the fluidized bed (3).
2. A process for producing an inner coating for a pipe according to claim 1, wherein the pipe work preparing step: and placing the heated pipe fitting workpiece (8) in a positioning ring (31) on a workbench, enabling the feeding end of the pipe fitting workpiece (8) to be communicated with the fluidized bed (3), and processing the pipe fitting workpiece (8) at the temperature of 140-280 ℃.
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| CN108296136A (en) * | 2018-03-21 | 2018-07-20 | 天华化工机械及自动化研究设计院有限公司 | The full powder forming units of steel pipe 3PE and moulding process |
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| US6019845A (en) * | 1998-04-23 | 2000-02-01 | Nakakoshi; Senkichi | Method for coating inner surfaces of metal tubes with powdery paint and apparatus therefor |
| CN2825132Y (en) * | 2005-06-10 | 2006-10-11 | 天津新技术产业园区天博科工贸有限公司 | Full automatic powder recovery device by pipeline hot spraying |
| CN103691215A (en) * | 2013-12-13 | 2014-04-02 | 郑州东方安彩耐火材料有限公司 | Heat preservation powder negative pressure recycling system in production of refractory material by using fusion casting method |
| CN207695097U (en) * | 2017-12-26 | 2018-08-07 | 天津市源泉钢塑管有限公司 | Multifunctional steel pipe internal plastic coating equipment |
| CN109465159A (en) * | 2018-10-23 | 2019-03-15 | 济南德士净水管道制造有限公司 | A kind of plastic coating method and plastic-coated device |
| CN110586391A (en) * | 2019-09-29 | 2019-12-20 | 上海图博可特石油管道涂层有限公司 | Full-automatic return bend powder spraying device |
| CN213377764U (en) * | 2020-09-30 | 2021-06-08 | 宜昌九一科技发展有限公司 | Aluminum alloy powder collecting device |
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