CN115464857A - Blow molding fluorination processing technology and processing equipment thereof - Google Patents

Abstract

The application relates to a blow molding fluorination processing technology and processing equipment thereof, relating to the technical field of fluorination treatment; the process comprises the following steps: preparing a plastic parison, placing the plastic parison in a cavity of a mold for blow molding, and closing the mold; preparing a fluorinated gas; introducing the fluorinated gas into the mold cavity, blowing the plastic parison by the fluorinated gas, and demolding; the processing equipment comprises: the device comprises a mould, a parison preparation module, a mixed gas preparation module and an injection-blow fluorination module; the parison preparation module is used for preparing a plastic parison, the mixed gas preparation module is used for preparing fluorinated gas, and the injection-blowing fluorinated module is used for injecting fluorinated gas into the mold. The method has the advantages that in the preparation process of the fluorinated gas, the concentration of the fluorine gas is monitored in real time on line, the mixing ratio of the fluorine gas and the nitrogen gas is automatically adjusted, and the preparation efficiency and the preparation accuracy of the fluorinated gas are improved.

Description

Blow molding fluorination processing technology and processing equipment thereof

Technical Field

The application relates to the technical field of fluorination treatment, in particular to a blow molding fluorination processing technology and processing equipment thereof.

Background

Blow molding, also known as hollow blow molding, is a plastic processing method, and plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, and the like, and hollow containers obtained by blow molding are widely used as industrial packaging containers; when a conventional blow molded container (such as a plastic bottle, a plastic barrel, etc.) is filled with an organic solvent, the barrier property is poor, and it is generally difficult to block the permeation of the organic solvent, so in order to improve the barrier property of the container, manufacturers generally add a step of performing fluorination treatment on the surface of the container after the blow molding step, that is, adding a fluorination furnace to the blow molded container, introducing a fluorinated gas into the fluorination furnace, and blowing the fluorinated gas to the surface of the container, so that the barrier layer is formed on the surface of the container, and the permeation resistance of the container against the solvent is improved.

In view of the above-mentioned related art, the inventors found that the process flow of introducing the fluorination furnace for treatment after the injection and blowing of the hollow vessel are completed prolongs the production cycle of the hollow vessel, resulting in low production efficiency of the hollow vessel.

Disclosure of Invention

In order to shorten the preparation period of the blow molding fluorination process of the container and improve the preparation efficiency, the application provides a blow molding fluorination processing process and processing equipment thereof.

In a first aspect, the present application provides a blow molding fluorination processing technology, which adopts the following technical scheme:

a blow molding fluorination process, comprising:

preparing a plastic parison, placing the plastic parison in a cavity of a mold for blow molding, and closing the mold;

preparing a fluorinated gas;

and (3) introducing the fluorinated gas into the mold cavity, blowing the plastic parison by the fluorinated gas, and demolding.

Through adopting above-mentioned technical scheme, the plastics parison is the hollow body that is formed by plastic materials preparation, put into the die cavity with the plastics type in batches when blowing to it, generally when blowing to the plastics parison, can let in compressed air to the plastics parison position in the die cavity, blow up the cavity position of plastics parison through compressed air, realize the shaping of container, and the direct practical fluorinated gas of this application carries out the blow molding to the plastics parison and handles, fluorinated gas still plays the effect of fluoridizing to the hollow inner wall of plastics parison simultaneously equally, reach the effect that blowing and fluoridize the operation and go on in step, and the preparation efficiency is improved.

Preferably, the preparing of the fluorinated gas comprises:

respectively pumping inert gas and fluorine gas for mixing, and detecting the concentration of the fluorine gas in the mixed gas;

and stopping pumping the inert gas and the fluorine gas when the concentration of the fluorine gas is in the range of 0.01-0.02 based on the detection result of the concentration of the fluorine gas, thereby finishing the preparation of the fluorinated gas.

By adopting the technical scheme, because the fluorine concentration of the fluorination furnace reaches 20% during the traditional fluorination treatment, the manufacturing cost is high, for this reason, the mixed gas (namely the fluorinated gas) containing 1% -2% of fluorine is prepared by adjusting the fluorine gas concentration, the fluorine gas consumption of single blow molding is reduced, the cost is saved, in addition, in the mixing process, the automatic control of the pumping amount of the fluorine gas and the inert gas is realized by the real-time detection of the fluorine gas concentration in the mixed gas and the feedback of the detection result, and the intelligent and efficient preparation of the fluorinated gas is further achieved.

In a second aspect, the present application further provides a blow-molding fluorination processing apparatus, including a mold, a parison preparation module, a mixture preparation module, and an injection-blow fluorination module; the parison preparation module is used for preparing a plastic parison, the mixed gas preparation module is used for preparing fluorinated gas, and the injection-blowing fluorinated module is used for injecting fluorinated gas into the mold.

Through adopting above-mentioned technical scheme, prepare the module through the mist and prepare fluorinated gas, prepare the plastics parison through the parison preparation module, the plastics parison that will prepare the completion is arranged in the mould, behind the compound die, through annotating blow and fluorinate the subassembly and blow in to the mould fluorinated gas, in order to substitute compressed air among the prior art through fluorinated gas and make the plastics parison blow by being annotated when blowing to bulging, by fluorinated gas realization to the fluorination on plastics parison surface, accomplish the blowing simultaneously, fluorinate the operation, the fluorinated machining efficiency of improvement blowing.

Preferably, the mixed gas preparation module comprises a mixing tank, an air inlet pipe, an exhaust gas pipe, a fluorine detector, a controller, a first pumping part and a second pumping part; the gas inlet pipe, the waste gas discharge pipe and the fluorine gas discharge pipe are all communicated with the mixing tank, the first pumping part is used for pumping inert gas into the mixing tank through the gas inlet pipe, the second pumping part is used for pumping fluorine gas into the mixing tank through the gas inlet pipe, and gas valves are arranged on the waste gas discharge pipe and the fluorine gas discharge pipe;

the fluorine-containing detector is electrically connected with the controller, the first pumping piece and the second pumping piece are both controlled by the controller, and the fluorine-containing detector is used for detecting the concentration of fluorine gas in the mixing tank and controlling the opening and closing of the first pumping piece, the second pumping piece and the gas valve based on the concentration of the fluorine gas.

By adopting the technical scheme, the air valve on the waste gas exhaust pipe is opened through the controller, the inert gas is pumped into the mixing tank through the first pumping part until the inert gas is full of the whole mixing tank, then the pumping of the inert gas is stopped, the fluorine gas is pumped into the mixing tank through the second pumping part, in the pumping process, the fluorine detector detects the concentration of the fluorine gas in the mixing tank in real time, when the concentration of the fluorine gas in the mixing tank reaches the preset concentration range, the controller controls the first pumping part to stop the pumping operation, and the air valve on the waste gas exhaust pipe is closed, so that the efficient and accurate preparation of the fluorine gas with the specified fluorine content is completed.

Preferably, a first shunting cover is arranged on the inner wall of the mixing tank close to the air inlet pipe, the first shunting cover is positioned on the periphery of the pipe orifice of the air inlet pipe, and a plurality of vent holes are formed in the side wall of the first shunting cover in a penetrating mode.

By adopting the technical scheme, the arrangement of the vent holes of the first shunting cover can shunt the fluorine gas or the inert gas output from the pipe orifice of the gas inlet pipe, so that the mixing uniformity of the fluorine gas and the inert gas in the mixing tank is improved, and the detection accuracy of the fluorine gas detector on the concentration of the fluorine gas is improved.

Preferably, the peripheral wall of the first shunting cover is provided with a plurality of elastic pieces, and the other ends of the elastic pieces are connected to the inner wall of the mixing tank.

Through adopting above-mentioned technical scheme, the setting up of elastic component makes the connection between first reposition of redundant personnel cover and the mixing tank be swing joint, and when the gas of carrying in the air-intake pipe to the mixing tank collided first reposition of redundant personnel cover this moment, first reposition of redundant personnel cover can slide relative mixing tank inner wall under the drive of elastic component, played the effect of disturbance air current, further realized the reposition of redundant personnel to the air current, improved the mixed homogeneity of fluorine gas and inert gas in the mixing tank, and then improved the detection accuracy nature to fluorine gas concentration of fluorine containing detector.

Preferably, the fluorine gas discharge pipe and the gas inlet pipe are communicated with one end of the mixing tank, and the waste gas discharge pipe is communicated with the other end of the mixing tank; the mixed gas preparation module further comprises a sliding plate, the sliding plate is connected in the mixing tank in a sliding mode along the length direction of the mixing tank, the peripheral wall of the sliding plate is attached to the inner wall of the mixing tank, an airflow channel used for being communicated with the waste gas exhaust pipe is arranged in the sliding plate, a reset piece is further arranged on the mixing tank and used for driving the sliding plate to slide to the end wall attached to the end wall, close to the air inlet pipe, of the mixing tank.

By adopting the technical scheme, when the preparation of the fluorinated gas is not started, the side wall of the sliding plate is attached to the inner wall of the mixing tank close to the gas inlet pipe, so that the gas inlet pipe and the mixing tank are in a state of being not communicated with each other; then, conveying inert gas into the mixing tank through the first pumping part, sliding the sliding plate towards a direction far away from the gas inlet pipe under the thrust action of the inert gas, extruding the original gas in the mixing tank from the waste gas exhaust pipe in the sliding process of the sliding plate, and when the waste gas exhaust pipe is communicated with the gas flow channel of the sliding plate, indicating that the inert gas is completely filled in the mixing tank, so that the addition of the sliding plate is helpful for accelerating the filling of the inert gas in the mixing tank, stopping pumping the inert gas at the moment, changing the pumping of the inert gas into the pumping of fluorine gas, discharging part of the inert gas in the mixing tank through the gas flow channel and the waste gas exhaust pipe along with the increase of the content of the fluorine gas in the mixing tank, detecting the fluorine content in the mixing tank through a fluorine-containing detector, and finishing the preparation of the fluorinated gas when the fluorine content reaches a preset concentration range; at the moment, the fluorine gas pumping is stopped, the gas valve at the fluorine gas discharge pipe is opened, the sliding plate is driven to move to the initial position through the reset piece, namely, the sliding plate is attached to the end wall of one end of the mixing tank close to the gas inlet pipe, and in the reset process, the prepared fluorinated gas is extruded out of the mixing tank from the fluorine gas discharge pipe through the sliding plate, so that the configured fluorinated gas can be completely discharged from the mixing tank through the mutual matching of the reset piece and the sliding plate.

Preferably, the mixed gas preparation module further comprises a partition plate, a rotating rod rotationally connected to the partition plate, a driving piece used for driving the rotating rod to rotate, two sub-plates connected to the rotating rod in a sliding manner, and a sliding piece; the inner part of the mixing tank is divided into an upper air cavity and a lower air cavity which are not communicated by the partition plate, the air inlet pipe, the exhaust gas pipe and the fluorine gas pipe are communicated with the upper air cavity, the air inlet pipe is positioned at one end of the mixing tank, and the exhaust gas pipe and the fluorine gas pipe are positioned at the other end of the mixing tank;

each end of the rotating rod corresponds to one sub-plate, the peripheral wall, far away from the rotating rod, of each sub-plate is attached to the inner wall of the mixing tank, one sub-plate is located in the upper air cavity, the other sub-plate is located in the lower air cavity, each sub-plate is internally provided with an air flow channel communicated with the exhaust pipe, and the sliding part is used for driving the other sub-plate to reversely slide when one sub-plate slides.

By adopting the technical scheme, the sub-plates positioned in the upper air cavity are attached to the pipe wall of the air inlet pipe in the initial state, so that the air inlet pipe and the upper air cavity are in a state of being not communicated with each other, when the controller controls the first pumping part to pump the inert gas, the sub-plates in the first cavity move under the push of the air flow and are attached to the end wall of the other end of the upper air cavity so as to discharge the gas in the upper air cavity, so that the upper air cavity only contains the inert gas, and in the sliding process of the sub-plates, the second sliding part drives the other sub-plate to reversely slide to the other end of the lower air cavity; and then, the fluorine gas is pumped by the second pumping and conveying part, redundant inert gas is discharged through the gas flow channel and the waste gas exhaust pipe, when the fluorine content in the upper gas cavity meets the specified requirement, the gas valve of the waste gas exhaust pipe is closed, the gas valve of the fluorine gas exhaust pipe is opened, the rotating rod is driven to rotate by 180 degrees, the sub-plate originally positioned in the lower gas cavity is rotated to be attached to the inner wall of the upper gas cavity, the inert gas can be pumped into the upper gas cavity through the second pumping and conveying part again, the sub-plate positioned in the upper gas cavity can discharge the fluorinated gas prepared in the previous batch into the exhaust pipe in the sliding process, and the preparation of the fluorinated gas in the next batch of fluorine gas can be started, so that the preparation efficiency is improved.

Preferably, the side walls of the sliding plate or the branch plate facing the air inlet pipe are provided with concave surfaces, and the concave surfaces are opposite to the pipe orifice of the air inlet pipe.

By adopting the technical scheme, the fluorine gas or the inert gas pumped into the mixing tank from the gas inlet pipe directly acts on the concave surface, the arrangement of the concave surface increases the contact surface when the fluorine gas or the inert gas contacts the sliding plate or the sub-plate, and reduces the sliding resistance of the sliding plate or the sub-plate, so that the sliding plate and the sub-plate can smoothly slide under the pushing of the gas flow.

Preferably, the inner wall of the mixing tank close to the air inlet pipe is provided with a yielding groove, a second shunting cover is arranged in the yielding groove, the second shunting cover is completely positioned in the yielding groove, and the side wall of the second shunting cover is provided with a plurality of air holes in a penetrating mode.

Through adopting above-mentioned technical scheme, the setting of second reposition of redundant personnel cover and bleeder vent can be shunted the gas that gets into in the mixing tank, improves the mixing homogeneity of inert gas and fluorine gas in the mixing tank, and the setting of the groove of stepping down can guarantee sliding of sliding plate or minute plate and the rotation of minute plate when realizing the reposition of redundant personnel.

In summary, the present application includes at least one of the following beneficial technical effects:

1. preparing fluorinated gas through a mixed gas preparation module, preparing a plastic parison through a parison preparation module, placing the prepared plastic parison in a mold, injecting fluorinated gas into the mold through an injection blowing fluorinated assembly after the mold is closed, so that the fluorinated gas replaces compressed air in the prior art to blow the plastic parison to swell through the injected fluorinated gas, the fluorinated gas is used for realizing the fluorination of the surface of the plastic parison, the blow molding and fluorination operations are synchronously performed, and the processing efficiency of blow molding fluorination is improved;

2. through the mutual cooperation of the mixed gas preparation module and the fluorine-containing detector, the fluorine gas concentration is monitored on line in the fluorine gas preparation process and fed back to the controller, and then the controller automatically adjusts the mixing ratio of the fluorine gas and the nitrogen gas based on the feedback data, so that the high-efficiency, accurate and automatic preparation of the fluorine gas with the specified fluorine content is realized.

Drawings

FIG. 1 is a schematic structural diagram of a blow molding fluorination processing apparatus in example 1 of the present application.

FIG. 2 is a sectional view showing the structure of a mixed gas preparation module according to example 1 of the present application.

Fig. 3 is an enlarged schematic view of fig. 2 for embodying the structure at a.

FIG. 4 is a sectional view showing the structure of a mixed gas preparation module according to example 2 of the present application.

Fig. 5 is an enlarged schematic view of the structure shown in fig. 4 for embodying point B.

FIG. 6 is a schematic view of a mixed gas preparation module according to example 3 of the present application.

FIG. 7 is a sectional view showing the structure of a mixed gas preparation module according to example 3 of the present application.

Fig. 8 is a sectional view for showing a positional relationship among the partition, the minute plate, the slide member, and the driving member in embodiment 3 of the present application.

Description of the reference numerals: 1. a mold; 2. a mixed gas preparation module; 21. a mixing tank; 211. a first flow-dividing hood; 2111. a vent hole; 2112. an elastic member; 212. a reset member; 213. an upper air cavity; 214. a lower air cavity; 215. a circulating gas pipe; 216. a yielding groove; 217. a second flow-dividing hood; 2171. air holes are formed; 22. an air inlet pipe; 23. an exhaust gas duct; 24. a fluorine gas discharge pipe; 25. a controller; 251. a fluorine-containing detector; 252. a first pumping member; 253. a second pumping member; 254. a drive member; 255. a sliding member; 26. a sliding plate; 261. an air flow channel; 262. a concave surface; 27. a partition plate; 28. a rotating rod; 281. dividing the plates; 282. a sliding cavity; 3. an injection blow fluorination module; 31. an air delivery pump; 32. a gas distribution block; 33. an air storage tank.

Detailed Description

Example 1

In a first aspect, the embodiment of the application discloses a blow molding fluorination processing technology, which is suitable for blow molding to form a hollow container, and fluorination operation is performed during blow molding, so that the processing and preparation efficiency is effectively improved; specifically, the blow molding fluorination processing technology specifically comprises the following steps:

s101, preparing a plastic parison, placing the plastic parison in a cavity of a blow molding die 1, and closing the die;

in the implementation, the plastic raw material is added into an extruder to be melted and extruded into a plastic parison, then the plastic parison is placed into a mold cavity which is preheated, and finally the mold is closed.

S102, preparing fluorinated gas;

in the implementation, the fluorinated gas refers to a mixture of fluorine gas and an inert gas, the inert gas may specifically be nitrogen gas (hereinafter, the inert gas is collectively and default to nitrogen gas), and the nitrogen gas may specifically be formed by vaporizing liquid nitrogen and processing the vaporized nitrogen gas by a gasification pressure stabilizing system; the fluorine gas concentration of the fluorine gas prepared in the application is in the range of 0.01-0.02, so that the consumption of the fluorine gas is saved, and the cost is saved.

Optionally, step S102 specifically includes the following sub-steps:

respectively pumping inert nitrogen and fluorine gas for mixing, and detecting the concentration of the fluorine gas in the mixed gas;

based on the detection result of the fluorine gas concentration, when the fluorine gas concentration is 0.01 to 0.02, the pumping of the nitrogen gas and the fluorine gas is stopped, and the preparation of the fluorinated gas is completed.

In implementation, referring to fig. 1, a mixing tank 21 with an exhaust gas discharge pipe 23 and a fluorine gas discharge pipe 24 is preset, nitrogen is firstly fed into the mixing tank 21 to purge the mixing tank 21, so that the original gas in the mixing tank 21 is discharged from the exhaust gas discharge pipe 23, and the mixing tank 21 is filled with only nitrogen, specifically, whether the mixing tank 21 is filled with nitrogen can be determined by detecting the concentration of nitrogen in the mixing tank 21; after the mixing tank 21 is filled with nitrogen gas, the pumping of nitrogen gas is stopped, fluorine gas is pumped into the mixing tank 21, the concentration of fluorine gas in the mixing tank 21 is detected, and when the concentration of fluorine gas reaches the concentration range, the pumping of fluorine gas can be stopped, so that the preparation of the fluorinated gas is completed.

And S103, introducing the fluorinated gas into the mold cavity, blowing up the plastic parison by the fluorinated gas, and demolding.

In the implementation, on the premise that the plastic parison is placed in the mold 1, the fluorinated gas is introduced into the mold 1, and the fluorinated gas is introduced into the hollow part of the plastic parison, so that the plastic parison is blown up, and the fluorinated gas performs fluorination treatment on the surface of the plastic parison during blow molding, so that the synchronous operation of blow molding and fluorination is realized, and the preparation efficiency is improved; and finally, stopping introducing the fluorinated gas after the blow molding fluorination is carried out for a specified time, and opening the mold to take out a finished product.

In a second aspect, embodiments of the present application disclose a blow molding fluorination processing apparatus, which is used for implementing the blow molding fluorination processing process described in the first aspect, and the structure of the blow molding fluorination processing apparatus will be further described in detail with reference to the accompanying drawings.

Referring to fig. 1, the blow-molding fluorination processing apparatus includes a mold 1, a parison preparation module 3, a mixed gas preparation module 2, and an injection-blow fluorination module 4, where the parison preparation module is used to prepare a plastic parison, and the parison preparation module in this embodiment may be specifically an extruder, and raw materials are melted and extruded by the extruder to form a plastic parison. A cavity into which the plastic parison is inserted is formed in the mold 1, and heating elements such as heating wires may be provided in the mold 1 in order to preheat the mold 1. The mixed gas preparation module 2 is used for preparing fluorinated gas with fluorine content in the range of 1% -2%; notes blow and fluoridize module 3 and be used for blowing into to mould 1 and fluoridize gaseous, notes in this application embodiment blow and fluoridize module 3 specifically can include gas transmission pump 31 and divide gas block 32, and the gas transmission pump 31 air inlet end is connected and is fluoridized gaseous air supply, and the other end passes through the pipeline and communicates in dividing gas block 32, divides gas block 32 to be linked together through pipeline and die cavity.

Referring to fig. 1 and 2, the mixed gas preparation module 2 includes a mixing tank 21, an intake pipe 22, an exhaust pipe 23, a fluorine exhaust pipe 24, a fluorine detector 251, a controller 25, a first pumping part 252, and a second pumping part 253. The first pumping piece 252 and the second pumping piece 253 are both air pumps, the air inlet end of the first pumping piece 252 is communicated with a nitrogen source, and the air inlet end of the second pumping piece 253 is communicated with a fluorine gas tank prestored in fluorine gas; the air outlet end of the first pumping piece 252 and the air outlet end of the second pumping piece 253 are both communicated with the air inlet pipe 22, and the other end of the air inlet pipe 22 penetrates through and is inserted into the end part of the mixing tank 21; the fluorine gas discharge pipe 24 is communicated with one end of the mixing tank 21 close to the gas inlet pipe 22, the exhaust gas discharge pipe 23 is communicated with one end of the mixing tank 21 far away from the gas inlet pipe 22, the exhaust gas discharge pipe 23 and the fluorine gas discharge pipe 24 are respectively provided with a gas valve, the other end of the fluorine gas discharge pipe 24 is communicated with a gas storage tank 33, the gas storage tank 33 is used for storing the prepared fluorinated gas, and the gas inlet end of the gas transmission pump 31 is communicated with the gas storage tank 33.

Referring to fig. 1 and 2, the fluorine detector 251 and all gas valves are electrically connected to the controller 25, the first pumping part 252 and the second pumping part 253 are controlled by the controller 25, the fluorine detector 251 may specifically be a spectrum analyzer, and the controller 25 may specifically be a PLC controller; the fluorine detector 251 detects the concentration of the fluorine gas in the mixing tank 21, and the controller 25 receives the detected concentration of the fluorine gas and controls the on/off states of the first pumping part 252, the second pumping part 253, and all the gas valves based on the concentration of the fluorine gas.

Referring to fig. 2 and 3, a first flow dividing cover 211 is disposed on an inner wall of the mixing tank 21 near the air inlet pipe 22, and the first flow dividing cover 211 covers the periphery of the pipe orifice of the air inlet pipe 22; the first shunting cover 211 is hemispherical, a plurality of elastic members 2112 are arranged between the peripheral wall of the first shunting cover 211 and the inner wall of the mixing tank 21, the elastic members 2112 can be springs, one end of each elastic member 2112 is welded to the peripheral wall of the first shunting cover 211, and the other end is welded to the inner wall of the mixing tank 21; the side wall of the first shunting cover 211 is perforated with a plurality of vent holes 2111 for shunting the nitrogen or fluorine gas entering the mixing tank 21 through the gas inlet pipe 22, so that the nitrogen or fluorine gas in the mixing tank 21 is uniformly mixed, and the detection accuracy of the fluorine-containing detector 251 is further improved.

The implementation principle of the blow molding fluorination processing equipment disclosed in the embodiment 1 of the application is as follows: opening a gas valve on the exhaust gas pipe 23 by the controller 25, starting the first pumping part 252 to deliver nitrogen gas into the mixing tank 21, after the nitrogen gas is pumped for a specified period of time, determining that the mixing tank 21 is filled with nitrogen gas, and the original gas in the mixing tank 21 is exhausted from the exhaust gas pipe 23, then closing the first pumping part 252 and starting the second pumping part 253 to deliver fluorine gas into the mixing tank 21, detecting the fluorine gas content in the mixing tank 21 in real time by the fluorine detector 251, when the fluorine gas content in the mixing tank 21 is in a concentration range of 1% -2%, closing the gas valves on the first pumping part 252 and the exhaust gas pipe 23 by the controller 25 to complete the preparation of the fluorinated gas, starting the gas valve on the fluorine gas pipe 24, and pumping the fluorinated gas which is prepared in the mixing tank 21 into the gas storage tank 33 by presetting a gas pump on a pipeline communicated between the fluorine gas pipe 24 and the gas storage tank 33; and then preparing a plastic parison through the parison preparation module 3, putting the plastic parison into the mold 1, and finally injecting fluorinated gas into the mold 1 through the injection-blowing fluorination module 4 to realize injection-blowing and fluorination of the plastic parison.

Example 2

Referring to fig. 4 and 5, the difference between the embodiment 2 of the present application and the embodiment 1 is that an abdicating groove 216 is formed on the inner wall of the mixing tank 21 near the air inlet pipe 22, a second flow dividing cover 217 is inserted into the abdicating groove 216, the second flow dividing cover 217 is completely inserted into the abdicating groove 216, and the second flow dividing cover 217 covers the periphery of the pipe orifice of the air inlet pipe 22; the second shunting cover 217 is hemispherical, a plurality of elastic members 2112 are arranged between the peripheral wall of the second shunting cover 217 and the inner wall of the mixing tank 21, the elastic members 2112 can be springs, one end of each elastic member 2112 is welded to the peripheral wall of the second shunting cover 217, and the other end of each elastic member 211is welded to the inner wall of the mixing tank 21; the second shunting cover 217 has a plurality of air holes 2171 formed through the sidewall thereof.

Referring to fig. 4 and 5, the mixed gas preparation module 2 further includes a sliding plate 26, a peripheral wall of the sliding plate 26 is attached to an inner wall of the mixing tank 21, and the sliding plate 26 is slidably connected in the mixing tank 21 along a length direction of the mixing tank 21, in an initial state, the sliding plate 26 is attached to an end wall of the mixing tank 21 close to the air inlet pipe 22, a concave surface 262 is arranged on a side wall of the sliding plate 26 facing the air inlet pipe 22, and the concave surface 262 is arranged opposite to a pipe orifice of the air inlet pipe 22; when nitrogen or fluorine gas is delivered into the mixing tank 21 through the gas inlet pipe 22, the sliding plate 26 slides towards one end close to the exhaust pipe 23 under the pushing of the gas flow, and extrudes the original gas in the mixing tank 21 until the gas moves to be attached to the inner wall of the mixing tank 21, and the movement is stopped, and in addition, the sliding plate 26 can be made of a light material, so that the pushing resistance of the gas flow to the sliding plate 26 is reduced.

Referring to fig. 4, alternatively, in order to know whether the sliding plate 26 moves to the end of the mixing tank 21 close to the exhaust pipe 23, a distance measuring sensor may be disposed on the end wall of the mixing tank 21 close to the exhaust pipe 23 for detecting the distance between the end wall of the mixing tank 21 close to the exhaust pipe 23 and the sliding plate 26, and the moving position of the sliding plate 26 may be known by electrically connecting the distance measuring sensor to the controller 25.

Referring to fig. 2 and 4, an air flow channel 261 is further formed in the sliding plate 26, the air flow channel 261 is used for communicating with the exhaust gas discharge pipe 23, a reset member 212 is further disposed in the mixing tank 21, the reset member 212 may be an air cylinder mounted on the mixing tank 21, and the reset member 212 is controlled by the controller 25; when the sliding plate 26 moves to the end wall attached to the end of the mixing tank 21 close to the exhaust gas discharge pipe 23, the air flow channel 261 is used for communicating with the exhaust gas discharge pipe 23, the controller 25 closes the first pumping element 252 and starts the second pumping element 253 to feed fluorine gas into the mixing tank 21, the fluorine gas concentration in the mixing tank 21 is detected by the fluorine gas detector 251 in the process, the second pumping element 253 and the valve on the exhaust gas discharge pipe 23 are closed when the specified fluorine gas concentration is reached, the valve on the fluorine gas discharge pipe 24 is opened, and the reset element 212 is controlled to push and reset the sliding plate 26, and in the reset process, the sliding plate 26 pushes and discharges the prepared fluorinated gas to the fluorine gas discharge pipe 24.

The implementation principle of the blow molding fluorination processing equipment disclosed in the embodiment 2 of the application is as follows: the gas valve on the exhaust gas discharge pipe 23 is opened through the controller 25, the first pumping element 252 is started to deliver nitrogen gas into the mixing tank 21, the sliding plate 26 is pushed to one end of the mixing tank 21 close to the exhaust gas discharge pipe 23 by the gas flow, at this time, the controller 25 closes the first pumping element 252 and starts the second pumping element 253 to deliver fluorine gas into the mixing tank 21, when the fluorine gas content in the mixing tank 21 is in a concentration range of 1% -2%, the preparation of fluorinated gas is completed, at this time, the controller 25 closes the gas valves on the first pumping element 252 and the exhaust gas discharge pipe 23, opens the gas valve on the exhaust gas discharge pipe 24 and moves the sliding plate 26 to the end wall close to the gas inlet pipe 22 of the mixing tank 21 through the resetting element 212 to extrude the fluorinated gas into the gas storage tank 33, then the parison preparation module 3 prepares a plastic parison, the plastic parison into the mold 1, and finally the injection and blowing fluorinated gas into the mold 1 through the injection and blowing fluorinated module 4 to realize the injection and the fluorinated gas into the plastic parison.

Example 3

Referring to fig. 6 and 7, embodiment 3 of the present application is different from embodiment 2 in that the mixed gas preparation module 2 further includes a partition plate 27, a rotating rod 28, a driving member 254, two partition plates 281, a sliding member 255, and a circulating gas pipe 215, the partition plate 27 is welded to an inner wall of the mixing tank 21, the mixing tank 21 is divided into an upper gas chamber 213 and a lower gas chamber 214 which are not communicated with each other by the partition plate 27, both ends of the circulating gas pipe 215 are communicated with an end portion of the mixing tank 21, and portions of the circulating gas pipe 215 communicated with the mixing tank 21 are respectively disposed at both ends of the mixing tank 21.

Referring to fig. 7 and 8, the rotating rod 28 is rotatably connected to the middle of the partition plate 27, and the rotating rod 28 divides the partition plate 27 into two parts which are not connected with each other; the rotating rod 28 is in an I shape, the driving element 254 is used for driving the rotating rod 28 to rotate, the driving element 254 can be a motor, the driving element 254 is embedded in the inner wall of the mixing tank 21, and the driving end of the driving element 254 is welded at the end part of the rotating rod 28; the section of the sub-plate 281 is semicircular, each end of the rotating rod 28 corresponds to one sub-plate 281, and the peripheral wall of the sub-plate 281 is attached to the inner wall of the mixing tank 21.

Referring to fig. 7 and 8, a sliding cavity 282 is formed in the rotating rod 28, the sliding cavity 282 penetrates through the surface of the rotating rod 28, the sliding member 255 is located in the sliding cavity 282, and the sliding member 255 is configured to drive one of the sub-plates 281 to move in the opposite direction when the other sub-plate 281 moves, specifically, the sliding member 255 includes a sprocket rotatably connected in the sliding cavity and a chain drivingly connected to the periphery of the sprocket, the chain is always in a tensioned state, a protruding block welded to a side wall of the chain is integrally formed on a side wall of the sub-plate 281, the protruding block can slide along the length direction of the sliding cavity 282, and when the sub-plate 281 in the upper air cavity 213 slides along the length direction of the mixing tank 21 under the pushing of the air flow, the sub-plate 281 in the lower air cavity 214 also moves along the length direction of the mixing tank 21, and the sliding directions of the two sub-plates 281 are opposite.

The implementation principle of the blow molding fluorination processing equipment disclosed in the embodiment 3 of the application is as follows: the controller 25 opens the gas valve on the exhaust gas discharging pipe 23, and starts the first pumping part 252 to deliver nitrogen gas into the mixing tank 21, the dividing plate 281 in the upper gas cavity 213 is pushed to one end of the mixing tank 21 close to the exhaust gas discharging pipe 23 by the gas flow, the dividing plate 281 in the lower gas cavity 214 moves to one end close to the gas inlet pipe 22 under the driving of the sliding part 255, at this time, the controller 25 closes the first pumping part 252 and starts the second pumping part 253 to deliver fluorine gas into the mixing tank 21, and when the fluorine gas content reaches a specified value, the controller 25 closes the second pumping part 253 and the gas valve on the exhaust gas discharging pipe 23, and the preparation of the fluorinated gas of the current batch is completed.

Then the controller 25 starts the driving member 254 to drive the rotating rod 28 to rotate 180 degrees and then stops, so that the sub-plate 281 originally located in the lower air chamber 214 rotates to the upper air chamber 213, then the air valve on the fluorine gas exhaust pipe 24 and the first pumping member 252 are opened again, the first pumping member 252 pushes the sub-plate 281 in the current upper air chamber 213 to move again, so that the fluorinated gas obtained in the previous batch of preparation is pushed to the fluorine gas exhaust pipe 24 to be exhausted, and simultaneously the upper air chamber 213 is refilled with nitrogen gas, and the preparation of the fluorinated gas in the second batch is started, that is, the continuous preparation of multiple batches of fluorinated gas is realized, and the preparation efficiency is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A blow molding fluorination processing technology is characterized in that: the method comprises the following steps:

preparing a plastic parison, placing the plastic parison in a cavity of a mold for blow molding, and closing the mold;

preparing a fluorinated gas;

and (3) introducing the fluorinated gas into the mold cavity, blowing the plastic parison by the fluorinated gas, and demolding.

2. The blow molding fluorination process of claim 1 wherein: the preparation of the fluorinated gas comprises:

respectively pumping inert gas and fluorine gas for mixing, and detecting the concentration of the fluorine gas in the mixed gas;

and stopping pumping the inert gas and the fluorine gas when the concentration of the fluorine gas is in the range of 0.01-0.02 based on the detection result of the concentration of the fluorine gas, thereby finishing the preparation of the fluorinated gas.

3. A blow molding fluorination processing equipment is characterized in that: comprises a mould (1), a parison preparation module, a mixed gas preparation module (2) and an injection-blow fluorination module (3); the parison preparation module is used for preparing plastic parisons, the mixed gas preparation module (2) is used for preparing fluorinated gas, and the injection-blowing fluorinated module (3) is used for injecting fluorinated gas into the mold (1).

4. A blow molding fluorination processing apparatus as claimed in claim 3 wherein: the mixed gas preparation module (2) comprises a mixing tank (21), an air inlet pipe (22), an exhaust gas pipe (23), a fluorine gas pipe (24), a fluorine detector (251), a controller (25), a first pumping piece (252) and a second pumping piece (253); the gas inlet pipe (22), the waste gas discharge pipe (23) and the fluorine gas discharge pipe (24) are all communicated with the mixing tank (21), the first pumping part (252) is used for pumping inert gas into the mixing tank (21) through the gas inlet pipe (22), the second pumping part (253) is used for pumping fluorine gas into the mixing tank (21) through the gas inlet pipe (22), and gas valves are arranged on the waste gas discharge pipe (23) and the fluorine gas discharge pipe (24);

the fluorine detector (251) is electrically connected with a controller (25), the first pumping piece (252) and the second pumping piece (253) are controlled by the controller (25), and the fluorine detector (251) is used for detecting the concentration of fluorine gas in the mixing tank (21) and controlling the opening and closing of the first pumping piece (252), the second pumping piece (253) and the gas valve based on the concentration of fluorine gas.

5. The blow molding fluorination processing apparatus of claim 4 wherein: the inner wall of the mixing tank (21) close to the air inlet pipe (22) is provided with a first flow dividing cover (211), the first flow dividing cover (211) is located on the periphery of the pipe opening of the air inlet pipe (22), and the side wall of the first flow dividing cover (211) penetrates through and is provided with a plurality of vent holes (2111).

6. A blow molding fluorination processing apparatus as claimed in claim 5 wherein: the peripheral wall of the first shunting cover (211) is provided with a plurality of elastic pieces (2112), and the other ends of the elastic pieces (2112) are connected to the inner wall of the mixing tank (21).

7. The blow molding fluorination processing apparatus of claim 4, wherein: the fluorine exhaust pipe (24) and the air inlet pipe (22) are communicated with one end of the mixing tank (21), and the exhaust pipe (23) is communicated with the other end of the mixing tank (21); the mixed gas preparation module (2) further comprises a sliding plate (26), the sliding plate (26) is connected in the mixing tank (21) in a sliding mode along the length direction of the mixing tank (21), the peripheral wall of the sliding plate (26) is attached to the inner wall of the mixing tank (21), an air flow channel (261) communicated with the exhaust gas discharge pipe (23) is arranged in the sliding plate (26), a reset piece (212) is further arranged on the mixing tank (21), and the reset piece (212) is used for driving the sliding plate (26) to slide to the end wall attached to the position, close to the air inlet pipe (22), of the mixing tank (21).

8. The blow molding fluorination processing apparatus of claim 4, wherein: the mixed gas preparation module (2) further comprises a partition plate (27), a rotating rod (28) rotatably connected to the partition plate (27), a driving piece (254) used for driving the rotating rod (28) to rotate, two sub-plates (281) connected to the rotating rod (28) in a sliding mode, and a sliding piece (255); the inner part of the mixing tank (21) is divided into an upper air cavity (213) and a lower air cavity (214) which are not communicated by the partition plate (27), the air inlet pipe (22), the waste gas exhaust pipe (23) and the fluorine gas exhaust pipe (24) are communicated with the upper air cavity (213), the air inlet pipe (22) is positioned at one end of the mixing tank (21), and the waste gas exhaust pipe (23) and the fluorine gas exhaust pipe (24) are positioned at the other end of the mixing tank (21);

each end of the rotating rod (28) corresponds to one sub-plate (281), the peripheral wall, far away from the rotating rod (28), of the sub-plate (281) is attached to the inner wall of the mixing tank (21), one sub-plate (281) is located in the upper air cavity (213), the other sub-plate (281) is located in the lower air cavity (214), an air flow channel (261) used for being communicated with the waste air exhaust pipe (23) is arranged in each sub-plate (281), and the sliding piece (255) is used for driving the other sub-plate (281) to reversely slide when one sub-plate (281) slides.

9. The blow molding fluorination processing apparatus of claim 7 or 8, wherein: the side walls of the sliding plate (26) or the sub-plate (281) facing the air inlet pipe (22) are provided with concave surfaces (262), and the concave surfaces (262) are opposite to the pipe orifice of the air inlet pipe (22).

10. The blow molding fluorination processing apparatus of claim 7 or 8, wherein: blending tank (21) are close to the inner wall of intake pipe (22) department and have seted up groove of stepping down (216), it is provided with second reposition of redundant personnel cover (217) in groove of stepping down (216), second reposition of redundant personnel cover (217) are located groove of stepping down (216) completely, second reposition of redundant personnel cover (217) lateral wall runs through and has seted up a plurality of bleeder vent (2171).

Images