CN114534654A - Post-treatment device and method for passivation and devolatilization of polyformaldehyde powder - Google Patents
Post-treatment device and method for passivation and devolatilization of polyformaldehyde powder Download PDFInfo
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- CN114534654A CN114534654A CN202210155189.6A CN202210155189A CN114534654A CN 114534654 A CN114534654 A CN 114534654A CN 202210155189 A CN202210155189 A CN 202210155189A CN 114534654 A CN114534654 A CN 114534654A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0046—Sequential or parallel reactions, e.g. for the synthesis of polypeptides or polynucleotides; Apparatus and devices for combinatorial chemistry or for making molecular arrays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
- B01J4/007—Feed or outlet devices as such, e.g. feeding tubes provided with moving parts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
- C08G2/28—Post-polymerisation treatments
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a post-treatment device and a post-treatment method for passivation and devolatilization of polyformaldehyde powder, which belong to the technical field of polyformaldehyde post-treatment, wherein the post-treatment device comprises a passivation cabin, a screw feeder, a devolatilization cabin, a main motor and a secondary motor, the passivation cabin is communicated with the screw feeder, the main motor is connected with the screw feeder in a shaft manner, the main motor is rotationally connected with a main shaft in the passivation cabin through a linkage belt, the secondary motor is rotationally connected with a connecting shaft in the devolatilization cabin, the polyformaldehyde powder and a passivator are mixed in the passivation cabin, the passivator inactivates an initiator to stop the formaldehyde polymerization reaction, the inactivated polyformaldehyde powder enters the devolatilization cabin through the screw feeder, the devolatilization cabin heats the polyformaldehyde powder to enable volatile components such as formaldehyde, moisture and the like in the polyformaldehyde powder to be separated from the polyformaldehyde powder, so as to obtain devolatilized pretreated polyformaldehyde, the passivation effect of the polymerization reaction is improved.
Description
Technical Field
The invention relates to the technical field of polyformaldehyde aftertreatment, in particular to a post-treatment device and a post-treatment method for passivation and devolatilization of polyformaldehyde powder.
Background
Polyformaldehyde is an engineering plastic with excellent performance and can be divided into polyformaldehyde and copolyformaldehyde according to different process technologies. The copolyformaldehyde has excellent hardness, strength, rigidity, chemical corrosion resistance and the like, and is widely applied to the fields of electronic appliances, precision instruments, automobile industry, building industry and the like. However, the polymerization reaction is continuously carried out due to the unreacted trioxymethylene and comonomers in the reaction system, unstable components in the product are increased, the thermal decomposition is serious, and the fluctuation of mechanical properties and thermal stability is large. Therefore, a post-treatment process is required to remove unreacted monomers, catalysts, etc. from the product to improve the quality of the paraformaldehyde.
The common post-treatment method is a dry inactivation-thermal devolatilization process, polyformaldehyde and a passivating agent are added into a screw reactor to carry out passivation reaction and volatile component removal, but organic matters are not pre-removed, and the product performance is unstable. Although the polyformaldehyde dry inactivation-thermal devolatilization process disclosed by the national patent publication CN212818280U and a polyformaldehyde post-treatment device can improve the devolatilization effect and the product quality, the polyformaldehyde powder still needs to be pretreated, most of volatile components are removed firstly, and the energy consumption of subsequent working sections is saved.
Disclosure of Invention
The invention aims to provide a post-treatment device and a post-treatment method for passivation and devolatilization of polyformaldehyde powder, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a metaformaldehyde powder passivation and post-processing apparatus who devolatilizes, post-processing apparatus includes passivation cabin, screw rod feeding machine, devolatilizes cabin, main motor, inferior motor, passivation cabin and screw rod feeding machine intercommunication, main motor is connected with screw rod feeding machine hub connection, and main motor rotates through linkage belt and the inside main shaft in passivation cabin to be connected, inferior motor rotates with the even axle of devolatilizing the cabin inside to be connected, screw rod feeding machine and devolatilizing the cabin inside intercommunication. Polyformaldehyde powder mixes with the passivating agent in the passivation cabin, the passivating agent makes the initiator inactivate, the going on of stopping formaldehyde polymerization, polyformaldehyde powder after the inactivation enters into the devolatilization cabin through the screw feeder, the devolatilization cabin makes formaldehyde in the polyformaldehyde powder, volatile components such as moisture break away from polyformaldehyde powder through heating polyformaldehyde powder, adopt the device of passivation cabin, screw feeder and devolatilization cabin combined work to carry out the preliminary treatment process, the passivation effect of polymerization has been improved, the impurity in the recovery liquid has been reduced, make monomer recovery system steady operation, the continuous steady operation of whole device system has been guaranteed.
The passivation cabin comprises a passivation cabin, a transmission rod is arranged above the passivation cabin, a bevel pinion and an auxiliary gear are arranged on the transmission rod, and the auxiliary gear is rotationally connected with the linkage belt;
a bearing plate is arranged in the passivation cabin, a cushion block is arranged above the bearing plate, and a truncated cone-shaped groove is formed in the middle of the cushion block;
the main shaft is rotatably arranged on the passivation cabin, a main helical gear is arranged at one end of the main shaft, the other end of the main shaft penetrates through the cushion block and the bearing plate, a variable-diameter blade is arranged on the main shaft, the main helical gear is rotatably connected with a small helical gear, and the variable-diameter blade is positioned on the inner side of the cushion block;
the spindle is of a hollow structure, a material distribution hopper is arranged at the other end of the spindle and communicated with the inside of the spindle, and the spindle is rotationally connected with a mechanism for supplying a passivating agent. The linkage belt drives the main shaft to rotate through the transmission rod and the bevel pinion, the passivation cabin is divided into two parts by the bearing plate, the cushion block is arranged above the bearing plate, the cushion block enables a small storage cabin to be formed above the bearing plate by arranging a circular truncated cone-shaped groove, the middle part of the bearing plate is provided with a discharge hole, the diameter of the discharge hole is the same as that of the contraction part of the circular truncated cone-shaped groove, polyformaldehyde powder is put into the storage cabin, the reducing blade is driven by the main shaft and is a spiral blade, the reducing blade transmits the polyformaldehyde powder to the lower part of the bearing plate, the polyformaldehyde powder in the storage cabin is conveyed by the reducing blade, the polyformaldehyde powder in the storage cabin is stirred by the reducing blade through rotation, the polyformaldehyde powder is prevented from being adhered to the cushion block and the inner wall of the passivation cabin, meanwhile, the blanking speed and the blanking amount of the polyformaldehyde powder are controlled through the rotation of the reducing blade, and the main shaft drives the distribution hopper to rotate, the polyformaldehyde powder flows on the surface of the material distributing hopper and is separated by the material distributing hopper, the passivating agent enters the passivating chamber from the main shaft, the passivating agent flows out of the material distributing hopper, and the passivating agent is contacted with the polyformaldehyde powder sliding off from the material distributing hopper.
The utility model discloses a passivation cabin, including loading board, mixing pipe, a plurality of arc blade, passivation cabin, feed distribution funnel, branch hopper, mixing pipe, a plurality of arc blade, the loading board below is rotated and is installed the mixing pipe, a plurality of arc blade is installed to mixing pipe inboard, slewing mechanism is installed in the passivation cabin outside the mixing pipe, slewing mechanism rotates with the mixing pipe to be connected, divide the hopper inboard to install the branch material awl, divide material awl below to install the charging tray, the charging tray is located branch hopper below and not with dividing the contact of hopper, at least two annular rank grooves have been seted up in the branch hopper outside. The outer surface of the material distribution hopper is divided into four step surfaces by the three step grooves, polyformaldehyde powder can impact on the next step surface when passing through one step groove every time, so that agglomerated polyformaldehyde powder is dispersed, the polyformaldehyde powder slides off from the material distribution hopper, the passivator flows onto the material distribution cone from the inner flow of the main shaft, the passivator is dispersed by the material distribution cone, the passivator falls onto the material tray through the material distribution cone, the material tray rotates under the drive of the main shaft, the passivator is thrown onto the polyformaldehyde powder, the material mixing pipe rotates under the drive of the rotating mechanism, the material mixing pipe stirs the inner air through the blades, the inner air generates rotational flow, the polyformaldehyde powder and the passivator are mixed under the influence of the rotational flow, the polyformaldehyde powder is contacted with more passivators under the influence of the rotational flow, and the mixing efficiency of the polyformaldehyde powder and the passivator is improved.
The spindle comprises an inner shaft and a sleeve, the reducing blades are installed on the sleeve, the main helical gear is installed on the inner shaft, a threaded groove is formed in the inner side of the sleeve, balls are installed on the inner shaft, and the balls are located in the threaded groove. The reducing blades are positioned in polyformaldehyde powder, the weight of the polyformaldehyde powder acts on the reducing blades, the friction force between polyformaldehyde powder and the friction force between the polyformaldehyde powder and the reducing blades block the rotation of the reducing blades, the polyformaldehyde powder generates resistance to the rotation of the reducing blades, the inner shaft is connected with the sleeve through the balls, the balls replace the threads on the inner shaft, the friction force between the inner shaft and the sleeve is reduced through the balls, in an initial state, the end with a small diameter of the reducing blades is not positioned in the discharge port, the polyformaldehyde powder is accumulated in the storage cabin and blocks the rotation of the reducing blades, the distribution hopper is blocked at the discharge port of the bearing plate, the sleeve is collected on the inner shaft, when the inner shaft rotates in the forward direction under the driving of the main motor, the balls move in the thread grooves, and the rotation of the sleeve is limited due to the blocking of the polyformaldehyde powder, the sleeve pipe is epaxial in the interior extension, make the sleeve pipe up-down motion in interior axle, make the minute hopper remove the shutoff to the discharge gate, when the ball moved the end of thread groove, the little one end of reducing blade diameter was located the discharge gate, interior axle drives the sleeve pipe and rotates, at this moment, the sleeve pipe drives reducing blade and rotates, reducing blade carries out the ration to polyformaldehyde powder, the constant speed conveying, when interior axle when the antiport under the drive of main motor, reducing blade antiport polyformaldehyde powder, it is intraductal to make polyformaldehyde powder can not fall into the compounding, simultaneously, polyformaldehyde powder produces the resistance to reducing blade's rotation once more, make interior axle pass through the ball and drive the sleeve pipe up motion, make minute hopper stifled at the discharge gate once more, realize the storage of polyformaldehyde powder.
The screw feeder comprises a material pipe, a screw is installed in the material pipe, a positive helical blade and a negative helical blade are installed on the screw, a feed inlet is formed in the material pipe above the positive helical blade, a connecting port is formed in the material pipe between the positive helical blade and the negative helical blade, the passivation cabin is connected with the material pipe through the feed inlet, the devolatilization cabin is rotatably connected with the material pipe through the connecting port, and the screw is connected with a main motor shaft.
The devolatilization cabin comprises a devolatilization cabin, a partition wall is arranged in the devolatilization cabin, at least two material gathering hoppers are arranged in the partition wall, the connecting shaft is provided with a driven gear and a bearing disc, the driven gear is positioned above the bearing disc, the driven gear is rotationally connected with the secondary motor, the bearing disc is arranged outside the devolatilization chamber, one end of the connecting shaft is provided with a feed hopper, the feed hopper is positioned in the connecting port, the connecting shaft positioned in the devolatilization chamber is connected with a material cage, the material cage is rotationally connected with the material gathering hopper positioned above, a section of the connecting shaft positioned between the material gathering hopper and the material cage is of a hollow structure, at least one hot material tray is arranged below the material cage on the connecting shaft, each hot material tray is positioned between two adjacent material collecting hoppers, the lower end of the devolatilization chamber is provided with a discharge pipe which is connected with a gathering hopper positioned below. Polyformaldehyde powder in screw rod feeding machine passes through the feeder hopper and links the axle landing to hot charging tray on, polyformaldehyde powder is through material cage dispersion on hot charging tray, the material cage is the tubular structure that both ends diameter is little, the big diameter in middle is connected, the position that the material cage diameter is big rotates with the collection hopper that is located the top, it carries out position restriction to linking the axle through the material cage to gather the hopper, prevent linking the axle up or down movement, simultaneously, it installs on the devolatilization cabin through bearing plate rotation to link the axle, bearing plate restricts the position of linking the axle equally, prevent linking the axle down movement in the devolatilization cabin, hot charging tray heats polyformaldehyde powder, the stoving, the rotation of inferior motor is for linking the axle provides power, the rotation of hot charging tray makes polyformaldehyde powder dispersion, the polyformaldehyde powder of devolatilization processing falls into row material pipe from gathering the hopper in advance, realize the discharge of polyformaldehyde powder.
Form the extraction cabin between partition wall and the devolatilization cabin, extraction cabin and external purge column pipe connection, every gather and all seted up the extraction hole on the terminal surface under the hopper, gather the hopper and be hollow structure, gather hopper and extraction cabin intercommunication.
The utility model discloses a heating device, including hot charging tray, time motor, driven gear, heating wire, hot charging tray up end is the concave surface, install a plurality of slope body in the concave surface, inferior motor is connected with the converter, installs the derailleur on the inferior motor, the derailleur passes through the belt and is connected with driven gear rotation, every install the heating wire in the hot charging tray, the heating wire is connected with external control system electricity. The polyformaldehyde powder is heated by the hot material tray, when the hot material tray rotates, the polyformaldehyde powder is dispersed on the concave surface of the hot material tray, the polyformaldehyde powder slides on a slope in the dispersing process, the polyformaldehyde powder generates leaping action, the polyformaldehyde powder is fully contacted with hot air, the secondary motor drives the connecting shaft to rotate at variable speed through the driven gear and is influenced by centrifugal force, the polyformaldehyde powder is continuously dispersed and polymerized on the hot material tray, the polyformaldehyde powder is turned over in the process, when the rotating speed of the secondary motor is increased and is kept at a certain rotating speed, the polyformaldehyde powder falls onto the collecting hopper from the hot material tray under the influence of the centrifugal force, and volatile components in the polyformaldehyde powder are separated from the powder in the heating process.
A post-treatment method for passivation and devolatilization of polyformaldehyde powder comprises the following specific steps:
s1, inactivating the polyformaldehyde powder;
s2, conveying and feeding by a screw feeder;
s3, devolatilizing polyformaldehyde powder;
s4, discharging the pretreated polyformaldehyde powder.
The step S1 includes the following specific steps: mixing polyformaldehyde powder with a passivating agent, and inactivating the initiator by the passivating agent;
the step S3 includes the following specific steps: and heating and drying the passivated polyformaldehyde powder to volatilize volatile components in the polyformaldehyde powder.
Compared with the prior art, the invention has the following beneficial effects: polyformaldehyde powder and a passivating agent are mixed in a passivation cabin, the passivating agent inactivates an initiator to stop the formaldehyde polymerization reaction, the inactivated polyformaldehyde powder enters a devolatilization cabin through a screw feeder, the devolatilization cabin heats the polyformaldehyde powder to separate volatile components such as formaldehyde and moisture in the polyformaldehyde powder from the polyformaldehyde powder, and the passivation cabin, the screw feeder and the devolatilization cabin work together to perform a pretreatment process, so that the passivation effect of the polymerization reaction is improved, impurities in a recovery liquid in a subsequent passivation and devolatilization treatment process are reduced, a monomer recovery system in the subsequent passivation and devolatilization treatment process is stably operated, and the continuous and stable operation of a subsequent treatment system is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the passivation chamber of the present invention;
FIG. 3 is a schematic view of the internal structure of the hopper of the present invention;
FIG. 4 is a schematic top view of the material-separating cone of the present invention;
FIG. 5 is a schematic view of the construction of the spindle of the present invention;
FIG. 6 is a schematic view of the internal structure of the devolatilizer of the present invention;
FIG. 7 is a schematic top view of the hot tray of the present invention;
fig. 8 is a schematic structural view of the material cage of the present invention.
In the figure: 1. a passivation chamber; 101. a passivation chamber; 102. a main shaft; 103. a variable diameter blade; 104. cushion blocks; 105. a distributing hopper; 106. a mixing pipe; 107. a material separating cone; 108. a material tray; 1021. an inner shaft; 1022. a sleeve; 1023. a ball bearing;
2. a screw feeder; 201. a material pipe; 202. a screw; 203. a positive helical blade; 204. a counter-helical blade;
3. a devolatilization chamber; 301. a devolatilization chamber; 302. a partition wall; 303. a gathering hopper; 304. a connecting shaft; 305. a hot tray; 306. a material cage; 307. a carrier tray; 308. a discharge pipe; 309. a slope body;
4. a main motor; 5. a linkage belt; 6. and a secondary motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 8, the present invention provides a technical solution: the utility model provides a metaformaldehyde powder passivation and post-processing apparatus who devolatilizes, post-processing apparatus includes passivation cabin 1, screw rod feeder 2, devolatilizes cabin 3, main motor 4, inferior motor 6, passivation cabin 1 and screw rod feeder 2 intercommunication, main motor 4 is connected with screw rod feeder 2 hub connection, main motor 4 rotates through linkage belt 5 and the inside main shaft 102 in passivation cabin 1 to be connected, inferior motor 6 rotates with the even axle 304 of devolatilizing the cabin 3 inside to be connected, screw rod feeder 2 and the devolatilizing the cabin 3 inside intercommunication.
The passivation cabin 1 comprises a passivation cabin 101, a transmission rod is arranged above the passivation cabin 101 through a support, a bevel pinion and a pinion are arranged on the transmission rod, the pinion is rotatably connected with the linkage belt 5, and the linkage belt 5 is rotatably connected with a gear on the main motor 4.
Install the loading board in the passivation cabin 101, the discharge gate has been seted up at the loading board middle part, loading board installs cushion 104 in the top, round platform form recess has been seted up at cushion 104 middle part, the diameter of discharge gate is the same with the diameter of round platform form recess shrink portion, the loading board divide into two parts with passivation cabin 101, cushion 104 is installed to the loading board top, cushion 104 is through seting up the recess of round platform form, make the loading board top form little storage cabin, during polyformaldehyde powder drops into the storage cabin.
The main shaft 102 is rotatably installed on the passivation cabin 101, a main helical gear is installed at one end of the main shaft 102, the other end of the main shaft 102 penetrates through the cushion block 104 and the bearing plate, a variable diameter blade 103 is installed on the main shaft 102 and is rotatably connected with a small helical gear, the variable diameter blade 103 is located on the inner side of the cushion block 104, the linkage belt 5 drives the main shaft 102 to rotate through a transmission rod and the small helical gear, the variable diameter blade 103 is driven by the main shaft 102 and is a spiral blade, polyformaldehyde powder is transmitted to the lower portion of the bearing plate through the variable diameter blade 103, the polyformaldehyde powder in the storage cabin is conveyed through the variable diameter blade 103, the polyformaldehyde powder in the storage cabin is prevented from being adhered to the inner walls of the cushion block 104 and the passivation cabin 101 through rotation of the variable diameter blade 103, and meanwhile the blanking speed and blanking amount of the polyformaldehyde powder are controlled through rotation of the variable diameter blade 103.
The diameter-variable blades 103 are arranged in the polyformaldehyde powder, the weight of the polyformaldehyde powder acts on the diameter-variable blades 103, the friction force between the polyformaldehyde powder and the diameter-variable blades 103 hinder the rotation of the diameter-variable blades 103, and the polyformaldehyde powder generates resistance to the rotation of the diameter-variable blades 103.
The main shaft 102 is of a hollow structure, the main shaft 102 is rotatably connected with a passivating agent supply mechanism, the other end of the main shaft 102 is provided with a material distribution hopper 105, the material distribution hopper 105 is communicated with the inside of the main shaft 102, the inner side of the material distribution hopper 105 is provided with a material distribution cone 107, a material tray 108 is arranged below the material distribution cone 107, the material tray 108 is positioned below the material distribution hopper 105 and is not contacted with the material distribution hopper 105, three annular stepped grooves are formed in the outer side of the material distribution hopper 105, and the outer surface of the material distribution hopper 105 is divided into four stepped surfaces by the three stepped grooves;
the main shaft 102 drives the material distribution hopper 105 to rotate, the polyformaldehyde powder flows on the surface of the material distribution hopper 105 and is separated by the material distribution hopper 105, the passivating agent enters the passivating chamber 101 from the main shaft 102, the passivating agent flows out from the material distribution hopper 105, the passivating agent is in contact with the polyformaldehyde powder sliding from the material distribution hopper 105, the polyformaldehyde powder impacts the next step surface when passing through a step groove, so that the agglomerated polyformaldehyde powder is dispersed, the polyformaldehyde powder slides from the material distribution hopper 105, the passivating agent flows to the material distribution cone 107 from the main shaft 102, the passivating agent is dispersed by the material distribution cone 107, the passivating agent falls on the material tray 108 through the material distribution cone 107, and the material tray 108 rotates under the driving of the main shaft 102 to throw the passivating agent onto the polyformaldehyde powder.
A mixing pipe 106 is rotatably arranged below the bearing plate, a plurality of arc-shaped blades are arranged on the inner side of the mixing pipe 106, a rotating mechanism (not shown in the figure) is arranged on the outer side of the mixing pipe 106 in the passivation chamber 101, the rotating mechanism is rotatably connected with the mixing pipe 106, and the rotating mechanism enables the mixing pipe 106 to rotate; the mixing pipe 106 is driven by the rotating mechanism to rotate, the mixing pipe 106 stirs the air on the inner side through the blades, so that the air on the inner side generates rotational flow, the polyformaldehyde powder and the passivating agent are mixed under the influence of the rotational flow, and the polyformaldehyde powder is contacted with more passivating agents under the influence of the rotational flow, so that the mixing efficiency of the polyformaldehyde powder and the passivating agents is improved.
The main shaft 102 comprises an inner shaft 1021 and a sleeve 1022, the reducing blade 103 is mounted on the sleeve 1022, the main helical gear is mounted on the inner shaft 1021, a thread groove is formed in the inner side of the sleeve 1022, a ball 1023 is mounted on the inner shaft 1021, the ball 1023 is located in the thread groove, the inner shaft 1021 is connected with the sleeve 1022 through the ball 1023, the ball 1023 replaces the thread on the inner shaft 1021, and friction between the inner shaft 1021 and the sleeve 1022 is reduced through the arrangement of the ball 1023.
In an initial state, the end with the small diameter of the reducing blade 103 is not positioned in the discharge hole, polyformaldehyde powder is accumulated in the storage cabin, the polyformaldehyde powder blocks the rotation of the reducing blade 103, the distribution hopper 105 is blocked at the discharge hole of the bearing plate, and the sleeve 1022 is received on the inner shaft 1021;
when the inner shaft 1021 rotates positively under the drive of the main motor 4, the ball 1023 moves in the thread groove, the reducing blade 103 is blocked by polyformaldehyde powder to limit the rotation of the sleeve 1022, the sleeve 1022 extends on the inner shaft 1021 to enable the sleeve 1022 to move downwards on the inner shaft 1021 to enable the hopper 105 to remove the blockage of the discharge port, when the ball 1023 moves to the tail of the thread groove, the end with the small diameter of the reducing blade 103 is positioned in the discharge port, the inner shaft 1021 drives the sleeve 1022 to rotate, at the moment, the sleeve 1022 drives the reducing blade 103 to rotate, and the reducing blade 103 carries out quantitative and constant-speed transmission on the polyformaldehyde powder;
when the inner shaft 1021 is driven by the main motor 4 to rotate reversely, the diameter-variable blades 103 reversely transmit polyformaldehyde powder, so that the polyformaldehyde powder cannot fall into the material mixing pipe 106, and meanwhile, the polyformaldehyde powder generates resistance to the rotation of the diameter-variable blades 103 again, so that the inner shaft 1021 drives the sleeve 1022 to move upwards through the balls 1023, the material distributing hopper 105 is blocked at the material outlet again, and the storage of the polyformaldehyde powder is realized.
The screw feeder 2 comprises a material pipe 201, a screw 202 is installed in the material pipe 201, a forward spiral blade 203 and a reverse spiral blade 204 are installed on the screw 202, a feed inlet is formed in the material pipe 201 above the forward spiral blade 203, a connecting port is formed in the material pipe 201 between the forward spiral blade 203 and the reverse spiral blade 204, the passivation cabin 101 is connected with the material pipe 201 through the feed inlet, the devolatilization cabin 3 is rotatably connected with the material pipe 201 through the connecting port, and the screw 202 is connected with a main motor 4 shaft.
A driven gear and a bearing disc 307 are arranged on the connecting shaft 304, the driven gear is positioned above the bearing disc 307 and is rotationally connected with the secondary motor 6, the bearing disc 307 is arranged outside the devolatilization chamber 301 through a thrust ball bearing, one end of the connecting shaft 304 is provided with a feed hopper which is positioned in a connecting port, a material cage 306 is connected on the connecting shaft 304 positioned in the devolatilization chamber 301, the material cage 306 is a tubular structure with small diameters at two ends and large diameter in the middle, the position with large diameter of the material cage 306 is rotationally connected with the uppermost aggregate hopper 303, a support plate is arranged at the position of the material cage 306 positioned below the aggregate hopper 303 and is fixed with the connecting shaft 304, one section of the connecting shaft 304 positioned between the feed hopper and the material cage 306 is a hollow structure, three hot material trays 305 are arranged below the material cage 306 on the connecting shaft 304, each hot material tray 305 is positioned between two adjacent aggregate hoppers 303, a discharge pipe 308 is arranged at the lower end of the devolatilization chamber 301, the discharge pipe 308 is connected to the lowermost aggregate bin 303.
Polyformaldehyde powder in the screw feeder 2 slides down onto a hot material tray 305 through a feed hopper and a connecting shaft 304, the polyformaldehyde powder is dispersed on the hot material tray 305 through a material cage 306, the position of the connecting shaft 304 is limited by a material collecting hopper 303 through the material cage 306, the connecting shaft 304 is prevented from moving upwards or downwards, meanwhile, the connecting shaft 304 is rotatably mounted on a devolatilization cabin 301 through a bearing plate 307, the bearing plate 307 also limits the position of the connecting shaft 304, the connecting shaft 304 is prevented from moving downwards in the devolatilization cabin 301, the polyformaldehyde powder is heated and dried by the hot material tray 305, the polyformaldehyde powder is dispersed by the rotation of the hot material tray 305, and the polyformaldehyde powder after pre-devolatilization treatment falls into a discharge pipe 308 from the material collecting hopper 303, so that the polyformaldehyde powder is discharged.
The upper end face of the hot material tray 305 is a concave surface, a plurality of slope bodies 309 are installed in the concave surface, the secondary motor 6 is connected with a frequency converter, a transmission is installed on the secondary motor 6 and is rotatably connected with a driven gear through a belt, a heating wire is installed in each hot material tray 305 and is electrically connected with an external control system, a heating wire is installed inside the hot material tray 305 and is electrically connected with the external control system, and the heating wire heats the hot material tray 305.
The thermal tray 305 heats the polyformaldehyde powder, when the thermal tray 305 rotates, the polyformaldehyde powder is dispersed on the concave surface of the thermal tray 305, the polyformaldehyde powder slides over the slope 309 in the dispersing process, so that the polyformaldehyde powder generates leap action, the polyformaldehyde powder is fully contacted with hot air, the secondary motor 6 drives the connecting shaft 304 to rotate at variable speed through the driven gear, the polyformaldehyde powder continuously performs the processes of scattering and polymerization on the thermal tray 305 under the influence of centrifugal force, the polyformaldehyde powder is turned over in the process, when the rotating speed of the secondary motor 6 is increased to a set value and keeps rotating at high speed for a certain time, the polyformaldehyde powder falls onto the aggregation hopper 303 from the thermal tray 305 under the influence of centrifugal force, and volatile components in the polyformaldehyde powder are separated from the powder in the heating process.
A post-treatment method for passivation and devolatilization of polyformaldehyde powder comprises the following specific steps:
s1, performing inactivation treatment on the polyformaldehyde powder, and comprising the following specific steps: mixing polyformaldehyde powder with a passivating agent, and inactivating the initiator by the passivating agent;
s2, conveying and feeding by a screw feeder;
s3, devolatilizing polyformaldehyde powder, and specifically comprising the following steps: heating and drying the passivated polyformaldehyde powder to volatilize volatile components in the polyformaldehyde powder;
s4, discharging the pretreated polyformaldehyde powder.
The working principle of the invention is as follows:
putting polyformaldehyde powder into a storage cabin, wherein the polyformaldehyde powder is accumulated in the storage cabin, the polyformaldehyde powder blocks the rotation of the reducing blades 103, the distribution hopper 105 is blocked at the discharge port of the bearing plate, when the inner shaft 1021 rotates in the forward direction under the drive of the main motor 4, the balls 1023 move in the threaded grooves, the reducing blades 103 are blocked by the polyformaldehyde powder to limit the rotation of the sleeve 1022, the sleeve 1022 extends on the inner shaft 1021, the sleeve 1022 moves downwards on the inner shaft 1021, the distribution hopper 105 is enabled to remove the blockage of the discharge port, when the balls 1023 move to the tail of the threaded grooves, one end of the reducing blades 103 with small diameter is positioned in the discharge port, at the moment, the inner shaft 1021 drives the sleeve 1022 to rotate, the sleeve 1022 drives the reducing blades 103 to rotate, and the reducing blades 103 carry out quantitative and constant-speed transmission on polyformaldehyde powder;
the polyformaldehyde powder flows onto the material distribution hopper 105 through the material outlet, the polyformaldehyde powder flows on the surface of the material distribution hopper 105 and is separated by the material distribution hopper 105, the passivating agent enters the passivating chamber 101 from the main shaft 102, the passivating agent flows out from the material distribution hopper 105, the passivating agent is in contact with the polyformaldehyde powder sliding off from the material distribution hopper 105, the polyformaldehyde powder impacts the next step surface when passing through a step groove, so that the agglomerated polyformaldehyde powder is dispersed, the polyformaldehyde powder slides off from the material distribution hopper 105, the passivating agent flows onto the material distribution cone 107 from the main shaft 102, the passivating agent is dispersed by the material distribution cone 107, the passivating agent falls onto the material tray 108 through the material distribution cone 107, and the material tray 108 rotates under the driving of the main shaft 102 to throw the passivating agent onto the polyformaldehyde powder.
The mixing pipe 106 is driven by the rotating mechanism to rotate, the mixing pipe 106 stirs the air on the inner side through the blades, so that the air on the inner side generates rotational flow, the polyformaldehyde powder and the passivating agent are mixed under the influence of the rotational flow, and the polyformaldehyde powder is contacted with more passivating agents under the influence of the rotational flow, so that the mixing efficiency of the polyformaldehyde powder and the passivating agents is improved.
The polyformaldehyde powder after inactivation is conveyed to the devolatilization chamber 3 by the screw feeder 2, the polyformaldehyde powder in the screw feeder 2 slides to the hot material tray 305 through the feed hopper and the connecting shaft 304, the polyformaldehyde powder is dispersed on the hot material tray 305 through the material cage 306, the polyformaldehyde powder is heated by the hot material tray 305, when the hot material tray 305 rotates, the polyformaldehyde powder is dispersed on the concave surface of the hot material tray 305, and the polyformaldehyde powder slides over the slope 309 in the dispersing process, so that the polyformaldehyde powder generates a leap action, and the polyformaldehyde powder is fully contacted with hot air.
After the devolatilization treatment is completed, the rotating speed of the secondary motor 6 is increased to a set value and is kept to rotate at a high speed for a certain time, the polyformaldehyde powder falls onto the collecting hopper 303 from the hot material tray 305 under the influence of centrifugal force, and the polyformaldehyde powder after the pre-devolatilization treatment falls into the discharging pipe 308 from the collecting hopper 303, so that the discharging of the polyformaldehyde powder is realized. And the treated polyformaldehyde powder is subjected to further passivation and devolatilization in the next dry inactivation and thermal devolatilization process.
When the inner shaft 1021 is driven by the main motor 4 to rotate reversely, the diameter-variable blades 103 reversely transmit polyformaldehyde powder, so that the polyformaldehyde powder cannot fall into the material mixing pipe 106, and meanwhile, the polyformaldehyde powder generates resistance to the rotation of the diameter-variable blades 103 again, so that the inner shaft 1021 drives the sleeve 1022 to move upwards through the balls 1023, the material distributing hopper 105 is blocked at the material outlet again, and the storage of the polyformaldehyde powder is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a metaformaldehyde powder passivation and post-processing apparatus of devolatilization which characterized in that: aftertreatment device includes passivation cabin (1), screw rod feeding machine (2), takes off and waves cabin (3), main motor (4), inferior motor (6), passivation cabin (1) and screw rod feeding machine (2) intercommunication, main motor (4) are connected with screw rod feeding machine (2) hub connection, and main motor (4) rotate with main shaft (102) of passivation cabin (1) inside through linkage belt (5) and are connected, inferior motor (6) rotate with taking off even axle (304) of volatilizing cabin (3) inside and be connected, screw rod feeding machine (2) with take off and wave cabin (3) inside intercommunication.
2. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 1, wherein: the passivation cabin (1) comprises a passivation cabin (101), a transmission rod is arranged above the passivation cabin (101), a bevel pinion and a pinion are arranged on the transmission rod, and the pinion is rotationally connected with the linkage belt (5);
a bearing plate is arranged in the passivation cabin (101), a cushion block (104) is arranged above the bearing plate, and a truncated cone-shaped groove is formed in the middle of the cushion block (104);
the main shaft (102) is rotatably arranged on the passivation cabin (101), one end of the main shaft (102) is provided with a main helical gear, the other end of the main shaft (102) penetrates through the cushion block (104) and the bearing plate, the main shaft (102) is provided with a variable-diameter blade (103), the main helical gear is rotatably connected with the small helical gear, and the variable-diameter blade (103) is positioned on the inner side of the cushion block (104);
the main shaft (102) is of a hollow structure, a material distribution hopper (105) is mounted at the other end of the main shaft (102), the material distribution hopper (105) is communicated with the inside of the main shaft (102), and the main shaft (102) is rotatably connected with a passivator supplying mechanism.
3. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 2, wherein: loading board below rotates installs mixing pipe (106), a plurality of arc blade is installed to mixing pipe (106) inboard, slewing mechanism is installed in mixing pipe (106) outside to passivation cabin (101) inside, slewing mechanism rotates with mixing pipe (106) to be connected, divide hopper (105) inboard to install branch material awl (107), divide material awl (107) below to install charging tray (108), charging tray (108) are located branch hopper (105) below and do not contact with branch hopper (105), divide hopper (105) outside to have seted up two at least annular step grooves.
4. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 2, wherein: the main shaft (102) comprises an inner shaft (1021) and a sleeve (1022), the reducing blades (103) are mounted on the sleeve (1022), the main helical gear is mounted on the inner shaft (1021), a threaded groove is formed in the inner side of the sleeve (1022), a ball (1023) is mounted on the inner shaft (1021), and the ball (1023) is located in the threaded groove.
5. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 1, wherein: the screw feeder (2) comprises a material pipe (201), a screw (202) is installed in the material pipe (201), a positive helical blade (203) and a negative helical blade (204) are installed on the screw (202), a feed inlet is formed in the material pipe (201) above the positive helical blade (203), a connecting port is formed in the material pipe (201) between the positive helical blade (203) and the negative helical blade (204), the passivation cabin (101) is connected with the material pipe (201) through the feed inlet, the devolatilization cabin (3) is rotatably connected with the material pipe (201) through the connecting port, and the screw (202) is connected with a main motor (4) shaft.
6. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 5, wherein: the devolatilization cabin (3) comprises a devolatilization cabin (301), the devolatilization cabin (301) is internally provided with a partition wall (302), at least two gathering hoppers (303) are installed in the partition wall (302), a driven gear and a bearing disc (307) are installed on a connecting shaft (304), the driven gear is positioned above the bearing disc (307), the driven gear is rotatably connected with a secondary motor (6), the bearing disc (307) is installed on the devolatilization cabin (301) outer side, the feeding hopper is installed at one end of the connecting shaft (304), the feeding hopper is positioned in a linking port, the connecting shaft (304) is positioned in the devolatilization cabin (301), the connecting shaft (304) is linked with a material cage (306), the material cage (306) is rotatably connected with the gathering hopper (303) positioned above, the connecting shaft (304) is of a hollow structure, at least one hot material disc (305) is installed below the material cage (306) on the connecting shaft (304), each hot charging tray (305) all is located between two adjacent collection hoppers (303), take off and wave the cabin (301) lower extreme and install row material pipe (308), it is connected with collection hopper (303) that are located the below to arrange material pipe (308).
7. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 6, wherein: form the extraction cabin between partition wall (302) and devolatilization cabin (301), the extraction cabin is connected with external purge column pipe, every gather all seted up the extraction hole on hopper (303) lower terminal surface, gather hopper (303) and be hollow structure, gather hopper (303) and extraction cabin intercommunication.
8. The post-treatment device for the passivation and devolatilization of polyoxymethylene powder according to claim 6, wherein: the utility model discloses a heating device, including hot charging tray (305), time motor (6), derailleur, driven gear, heating wire and external control system electricity are connected to the time motor (6), the heating tray (305) up end is the concave surface, install a plurality of slope body (309) in the concave surface, inferior motor (6) are connected with the converter, install the derailleur on inferior motor (6), the derailleur passes through the belt and is connected with driven gear rotation, every install the heating wire in hot charging tray (305), the heating wire is connected with external control system electricity.
9. The method applied to the post-treatment device for the passivation and devolatilization of the polyoxymethylene powder as set forth in claim 1, wherein: the post-processing method comprises the following specific steps:
s1, inactivating the polyformaldehyde powder;
s2, conveying and feeding by a screw feeder;
s3, devolatilizing polyformaldehyde powder;
s4, discharging the pretreated polyformaldehyde powder.
10. The post-treatment method for the passivation and devolatilization of polyoxymethylene powder according to claim 9, wherein the post-treatment method comprises: the step S1 includes the following specific steps: mixing polyformaldehyde powder with a passivating agent, and inactivating the initiator by the passivating agent;
the step S3 includes the following specific steps: and heating and drying the passivated polyformaldehyde powder to volatilize volatile components in the polyformaldehyde powder.
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