CN108556305A - A kind of filtration system - Google Patents
A kind of filtration system Download PDFInfo
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- CN108556305A CN108556305A CN201810338279.2A CN201810338279A CN108556305A CN 108556305 A CN108556305 A CN 108556305A CN 201810338279 A CN201810338279 A CN 201810338279A CN 108556305 A CN108556305 A CN 108556305A
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- Prior art keywords
- filter
- melt
- recoil
- channel
- booster pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/69—Filters or screens for the moulding material
- B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92019—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92361—Extrusion unit
- B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/924—Barrel or housing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a kind of filtration systems, are at least made of sequentially connected first booster pump, first filter, the second booster pump, the second filter and control unit；First filter is twin columns backpulsing draping filter；Second filter is melt automatic recoil filter；Control unit is connected with positioned at two pressure sensors of first filter both sides, the pressure sensor positioned at the second filter both sides, the first booster pump, first filter, the second booster pump, the second filter respectively.The invention also discloses a kind of operating procedures of filtration system.The present invention realizes the auto-flushing of the second filter filter screen, when the melt outlet and excessive melt inlet pressure difference of the second filter, starts backwash process automatically, the position and movement distance of the filter recoil axis of the second filter is precisely controlled；Line construction reasonable design, high to the filtering specific aim of high-temperature fusant, filter cycle is long, avoids frequently replacing filter, and filtering is stablized, and filter efficiency is high.
Description
Technical field
The invention belongs to filter plant fields, more particularly, to a kind of filtration system suitable for high-temperature fusant.
Background technology
The filtering of material at present is general to be carried out in the form of single-filter filtering, and specific aim is not high, and filter effect is bad,
Such as in PET thermoplastic poly ester production process, caused by the gel of chemical reaction process high temperature formation, long-term thermal history
The impurity such as carbonization need to remove, and often refer to filter progress.Primary polyester thermal history is short, and impurity content is low, mostly uses at end
The technical solution of candlewick formula filter is set before polycondensation, and the production of recycled polyester is mostly original with bottle piece, waste silk, waste textile
Material, source, complicated component, impurity content are high, and the ingredients such as spinning oil, printing and dyeing assistant in raw material easily lead to polyester degradation,
If carbonization, generation gel can cause filter service life extremely short using by-pass filtration, replace frequently, therefore recycled polyester
Production need design multistage filtering.
On the other hand, because of impurity content height, mostly use in recycled polyester production process can online backflushing filter, filtering
When device blocks, it can backwash, while normal transportation process is uninterrupted.However when the back-flushing filter recoil of routine, 25%
Melt throughput for recoiling, only 75% melt can be with normal transmission.
Therefore, two-stage filter is set, and the mode that filtering accuracy improves successively can improve filter effect, extend filtering
Device service life, while reducing influence of the recoil to normal melt transfer efficiency.
Invention content
For overcome the deficiencies in the prior art, a kind of specific aim of present invention offer is high, filter efficiency is high, filter effect is good,
Filter filtration system with long service life.
The technical solution adopted by the present invention to solve the technical problems is：A kind of filtration system, at least by sequentially connected
First booster pump, first filter, the second booster pump, the second filter and control unit composition；
The first filter is twin columns backpulsing draping filter, includes plunger, and the plunger at one end is inserted into
In filter screen cavity, the other end is connected with hydraulic cylinder；The plunger is communicated with filter screen cavity, is water chestnut in filter screen cavity
Shape melt canal is provided with pressure sensor and melt inlet, pressure sensor and melt outlet；The filter screen cavity setting
There are backwash channel, the diamond shape melt canal to be formed with backwash channel and intermesh and communicate two states；
Second filter is melt automatic recoil filter, is included at least by cylindric cylinder and middle control system
System, the body centre are provided with filter recoil axis, filtering disc, filter screen and support frame；The cylinder body bottom
Equipped with melt inlet, top is provided with melt outlet, and pressure sensor is provided at the melt inlet and melt outlet；Institute
Multiple symmetrical laterally recoil channels are provided on the filter recoil axis stated；The support frame forms multiple S types melts
Runner；The lateral recoil channel and melt flow channel formation intermeshes and communicates two states one by one；
Described control unit respectively with positioned at first filter both sides two pressure sensors, be located at the second filter two
The pressure sensor of side, the first booster pump, first filter, the second booster pump, the second filter are connected, in first filter
When the pressure difference of two pressure sensors at inlet and liquid outlet reaches setting value, control unit detect first filter into
When row backwash, adjusts the first booster pump and increase flux；Two pressure at the inlet and liquid outlet of the second filter pass
When the pressure difference of sensor reaches setting value, when control unit detects that the second filter is backwashed, adjust the first booster pump and
Second booster pump, which synchronizes, increases flux；Control unit is additionally operable to control first filter and the non-concurrent startup recoil of the second filter
Washing procedure.
The center setting filter recoil axis of second filter of the invention, by being moved down on filter recoil axis
It is dynamic, whether carrying out multiple laterally unicom of recoil channel and melt flow channel on controlling filter recoil axis, realize to filter screen
Auto-flushing, cleaning efficiency is high, and cleaning performance is good, and filtering and cleaning can save many dismounting processes with slitless connection；Middle control
The setting of system then realizes accurately controlling of moving up and down of filter recoil axis, convenient for laterally recoil channel can and melt flow channel
Alignment, also allow for controlling filter recoil axis and move up displacement distance；The pressure sensor of melt inlet and melt outlet is set
It sets, then the accumulation of impurities situation on monitor filter filtering net is facilitated to ensure convenient for being filtered the backwash of net in time
The orderly progress of filter.
First filter can carry out online backflushing, and filter screen is disposable, and it is convenient to replace, and use cost is low, still
Filter effect is bad, and precision is low, and the filtering being not suitable under high pressure, and strainer is easily breakdown, be suitable for filtering 20 microns with
On inorganic impurity；Second filter can online backflushing, filter service life is long, and filtering accuracy is high, but strainer pressure resistance is not enough,
It is contour containing miscellaneous medium for recycled polyester melt to be adapted as primary filter；The present invention filters first filter and second
Device is applied in combination, the advantages of combining first filter and the second filter, effectively prevents that a filter band is used alone
The problem of hypertonia come, degradation is serious, and color value increases is not in the uncontrollable situation of follow-up dyeing course color matching,
Preventing single filter to be in excessive use state causes later stage cleaning difficult, and reduced lifetime not only increases normal transmission
Melt canal, and the service life of filter is extended, filter cycle is long, avoids frequently replacing filter, to high-temperature fusant
The better adaptability of filtering, filtering accuracy are high.
Further, second filter is at least two, when work, laterally recoil channel and melt flow channel it is mutual
Staggeredly, laterally recoil channel is closed, and melt enters melt flow channel through melt inlet, downwards through filter screen, flows upwards out the second mistake
Filter；When recoil, central control system controlling filter recoils axis movement, the described lateral recoil channel and melt flow channel phase one by one
Logical, melt flushing-back filtering net enters filter recoil axis discharge through laterally recoil channel.
Further, at least two second filters are arranged on different branch roads, are distinguished by multiple-way valve
It is connected with the second booster pump.The setting of two the second filters ensure that being normally carried out for filtering, when wherein one second filtering
When device is filtered, another the second filter is in stand-by state, can when wherein second filter is backwashed
It is worked with starting another the second filter, ensures continuing, stablizing progress for filtering.
Further, it is provided with pressure sensor at the melt inlet and melt outlet of second filter, pressure difference reaches
When to setting value, central control system is opened according to the blow-off valve of pressure difference signal controlling filter recoil axis bottom and controlling filter is anti-
Axis movement is rushed, central control system controls laterally recoil channel and melt flow channel phase by the way that filter recoil axis shift position is arranged
Logical, central control system is by being arranged the residence time come controlling filter recoil axis displacement distance.
Further, chuck is provided with outside the cylindric cylinder, the temperature of the chuck is 250-270 DEG C.
The setting of chuck ensure that the temperature of melt in filter, avoid melt temperature in filter process from declining excessive, to subsequent
Technique impacts.
Further, drainage conduit is equipped at the melt inlet of second filter.Melt flows into the first of the second filter
Phase, the flow velocity and flow of melt are not highly stable, open drainage conduit at this time, and the melt of leading portion is discharged, waits for the confession of melt
After reaching stable state, drainage conduit is turned off, melt is imported in the second filter and is filtered, ensures the stabilization of filtering
Property.
Further, exhaust outlet is equipped at the melt outlet of second filter.When melt flows into the second filter
When, exhaust outlet is opened, the air extrusion in the second filter is discharged, after melt is completely or nearly fully filled with filter,
Exhaust outlet is closed, normal filtration is carried out, avoids the air that accumulation is excessive in the second filter from causing relative pressure excessive, to second
The circulation of melt impacts in filter.
Further, the filter recoil shaft end is equipped with the axis that recoils with central control system cooperation, for controlling filter
The stroke sensor of displacement distance.
Further, the filtering accuracy of first filter device is 20-60 microns；The filtering of second filter device
Precision is 20-40 microns.The gradient of different filtering accuracies is arranged, and extends the service life of filter, avoids frequently replacing
Filter.
Further, quantitative proportion≤10% of the quantity and melt flow channel in the laterally recoil channel.Assuming that melt flow
Road is 100 groups, and when the lateral recoil channel on filter recoil axis only has 1, filter recoil axis needs mobile 100 ability
Entire back flushing process is completed, filter normal melt flux has 99% at this time；If laterally recoil channel there are 4, only need
Mobile 25 completions back flushing process, normal melt flux is 96% when recoil, that is to say, that laterally the quantity in recoil channel is more,
That recoils is faster, but normal melt flux is fewer, and the fluctuation of filter outlet melt pressure is frequent in back flushing process, why sets
Set within 10%, be take into account melt throughput and backwash efficiency as a result, it is possible to reduce recoil when pressure fluctuation.
The invention also discloses a kind of operating procedures of filtration system comprising following steps：
1) pressure difference of first filter pressure at both sides sensor is set as 10-40bar, sets the second filter pressure at both sides
The pressure difference of sensor is 30-100bar, sets the recoil frequency values of the second filter of any road；
2) the first booster pump is adjusted so that the inlet pressure of first filter melt is more than 65bar；
3) blow-off valve for closing the second filter opens drainage conduit and carries out discharge 10-80 minutes, opens exhaust outlet, fusion
Body enters big channel with the flow velocity of 0.2-2t/h from inlet valve, and enters melt flow channel by the inlet opening of big channel side wall and carry out
It filters step by step, when melt is full of entire cylinder, closes exhaust outlet and continue to filter；
4) when the pressure difference superelevation setting value of first filter pressure at both sides sensor, first filter starts recoil
It washes, while control unit adjusts the first booster pump and increases flux, the second booster pump is adjusted to maintain the liquid outlet of first filter
Place's pressure is constant, and first filter is in normal filtration state；
5) first filter completes backwash and carries out normal filtration, when the pressure difference of the second filter pressure at both sides sensor
When superelevation setting value, the second filter starts backwash, and central control system controls blow-off valve and opens, under filter recoil axis is automatic
It moves, channel of laterally recoiling communicates one by one with melt flow channel, melt flushing-back filtering net, enters filter recoil through laterally recoil channel
Axis is discharged, while control unit adjusts the first booster pump and the second booster pump synchronizes and increases flux；
6) first filter normal filtration, when monitoring that the recoil frequency of the second filter is higher than setting value, control system
It adjusts multiple-way valve to guide the melt of the branch to another branch, be filtered by spare second filter.
The beneficial effects of the invention are as follows：The auto-flushing for realizing the second filter filter screen, when the melt of the second filter
When outlet and melt inlet pressure difference are excessive, start backwash process automatically, the position of the filter recoil axis of the second filter and
Displacement distance is precisely controlled；Line construction reasonable design, high to the filtering specific aim of high-temperature fusant, filter cycle is long, keeps away
Exempt from frequently to replace filter, filtering is stablized, and filter efficiency is high, and filter effect is good.
Description of the drawings
Fig. 1 is the flowage structure schematic diagram of the present invention.
Fig. 2 is the switch plunger structure diagram of first filter in the present invention.
Front view when Fig. 3 is first filter normal use of the present invention.
Side view when Fig. 4 is first filter normal use of the present invention.
Vertical view when Fig. 5 is first filter normal use of the present invention.
Fig. 6 is a kind of vertical view of backwashing state of first filter of the present invention.
Fig. 7 is the vertical view of first filter another kind backwashing state of the present invention.
Fig. 8 is the normal filtration status diagram of the second filter in the present invention.
Fig. 9 is the structural schematic diagram of the filter recoil axis of the second filter of the invention.
Figure 10 is the part-structure schematic diagram for crossing self-filtering net and support frame of the second filter of the invention.
Figure 11 is the backwashing state schematic diagram of the second filter of the invention.
Specific implementation mode
In order to make those skilled in the art be better understood from the present invention program, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention carry out clear, complete description, it is clear that described embodiment is only
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
As shown in Figure 1, a kind of filtration system, be suitble to it is high contain miscellaneous regeneration melt, including sequentially connected first booster pump 11,
Pressure sensor 1, pressure sensor 2, the second booster pump 12, pressure sensor 3, passes through multiple-way valve connection at first filter
At least two-way carry the second filter filtering branch, be connected to the second filter rear end pressure sensor 4 and respectively with
The connected control unit of above structure, the control unit can control the backwash of first filter and the second filter action can not
Synchronous to carry out, control unit is especially connected with the central control system of the second filter.
When the pressure sensor 1 of first filter both sides and 2 pressure difference of pressure sensor reach setting value, first filter
It is automatic to start backwash, when control unit perceives first filter and is recoiled at this time, normal melt flow when due to recoil
It reduces, for the stabilization of afterflow rate after maintenance, the first booster pump flux increases automatically, and increased quantity is to offset because backwash is brought
Flow reduce, the second booster pump is adjusted automatically to maintain the pressure of pressure sensor 2 constant, and guarantee has enough pressure
It recoils, and maintains the pressure stability of later process.
When the pressure sensor 3 of the second filter both sides and 4 pressure difference of pressure sensor reach setting value, the second filter
It is automatic to start backwash, when control unit perceives the second filter and is recoiled at this time, the first booster pump and the second booster pump
Flux, which synchronizes, to be increased, the reduction of flux when being recoiled with offsetting, while maintaining the pressure of pressure sensor 4 constant.
When the recoil frequency that control unit perceives the second filter is higher than setting value, that is, think that second filter loses
Effect automatically controls multiple-way valve and melt is guided to the second filter to another spare road at this time.As one under normal condition
It recoil 10 times, i.e., 2.4 hours recoil successively, when recoil frequency become 2 it is small when or 1.5 it is small when it is primary when, that is, judge this second
Filter failure, specific numerical value can be set as the case may be.
As illustrated in figs. 2-7, first filter is twin columns backpulsing draping filter 2, and filtering accuracy is 20-60 microns,
Including plunger 21, distribution plate 22, guiding valve, net-changing device cavity 26 and hydraulic cylinder 28 are closed, in symmetrically being set on its side wall on plunger 21
Cavity there are two setting, is referred to as cavity 1 and cavity 2 212, distribution is respectively charged into cavity 1 and cavity 2 212
Plate 22, strainer group 23 and screen retainer 24, distribution plate 22 therein are hemispherical dome structure, and its spherical surface is towards inside plunger 21,
Another side is then equipped with strainer group 23, and strainer group 23 is made of two layers of skeleton 231 and two layers of fine net 232, two layers of fine net
232 set gradually, and precision is 100 microns, and two layers of skeleton 231 is then located at the left and right sides of fine net 232, strainer group 23
Outside is fixed by screen retainer 24；One end that plunger 21 is provided with cavity is packed into net-changing device cavity 26, the other end then with hydraulic pressure
The position bar 281 of cylinder 28 is connected；Diamond shape melt flow channel is provided in net-changing device cavity 26, the sky of the melt flow channel and plunger 21
Chamber is connected to, which is arranged through net-changing device cavity 26, and one end is melt inlet 261, and the other end is melt outlet
264, melt flow channel is made of symmetrically arranged melt flow channel 1 and melt flow channel 2 263, melt flow channel 1 and melt
Runner 2 263 is then converged at 261 place center line symmetrical setting of melt inlet, the end of the two at melt outlet 264；Melt
It is provided with closing guiding valve on the net-changing device cavity 26 of 261 side of entrance, backwash mouth 25, the recoil are provided on the closing guiding valve
It washes mouth 25 and is connected to the cavity of plunger 21 by backwashing runner 251；It is provided with pressure sensor on distribution plate 22, which passes
Sensor is connected with hydraulic cylinder 28 and closing guiding valve, to realize the transmission of pressure signal.There are two the settings of plunger 21, respectively column
Two 21b of a 21a and plunger is filled in, two 21b of plunger is located at the underface of one 21a of plunger, and is with the center line of net-changing device cavity 26
Symmetry axis is symmetrical arranged, and each plunger 21 corresponds to a hydraulic cylinder 28, and the wherein corresponding hydraulic cylinders of one 21a of plunger are known as hydraulic cylinder
The corresponding hydraulic cylinder of one 28a, two 21b of plunger is known as two 28b of hydraulic cylinder, and a position bar is arranged in corresponding each hydraulic cylinder 28
281, each position bar 281 corresponds to a plunger 21.
Under normal circumstances, melt respectively enters melt flow channel 1 and melt flow channel 2 263 from entrance 261, and the allocated
Plate 22 is filtered after distributing by strainer group 23, and melt first carries out coarse filtration by skeleton 231, then through 232 essence of two layers of fine strainer
After thin filtering, after one of skeleton 231, is flowed out, that is, completed just by the melt outlet 264 of 26 other end of net-changing device cavity
Normal melt filtration and supply work；With the progress of filtering, the impurity in strainer group 23 is built up, and melt pressure is on
It rises, when pressure sensor detects that the melt pressure on one 21a of plunger reaches setting value, in this present embodiment, sets pressure difference
For 10-40bar, pressure sensor sends out the signal, and one 28a of hydraulic valve pushes one 21a of plunger to be displaced outwardly by position bar,
The components such as the strainer group 23 corresponding on the left of one 21a of plunger are disconnected with melt flow channel 1, and anti-corresponding to mouth with backwashing
Flushing flow passage 251 is connected to, then the sub-fraction melt in 264 one end melt flow channel of melt outlet is flow backwards, and will accumulate in strainer group
Impurity on 23 is taken out of, and when the pressure in strainer group 23 is less than setting value, one 21a of plunger is under the action of one 28a of hydraulic cylinder
It moving backward and resets, backwash runner 251 is connected to plunger one 21a disconnections, and one 21a of plunger is connected to melt flow channel 1,
And continue normal melt filtration and conveying；Same reason, 23 pressure of strainer group on the right side of one 21a of plunger are more than to set
When definite value, one 21a of plunger is moved backward, and right side strainer group is made to be connected to the backwash runner on right side, carries out right side strainer group
Backwash.
When backwash cannot achieve the removing of impurity, promotion plunger 21 is moved outwardly to strainer group 23 and leaked by hydraulic cylinder 28
Go out other than net-changing device cavity 26, at this point, removal screen retainer 24, you can remove strainer group 23, the strainer group 23 is through depth
It can be recycled again after cleaning, greatly prolong draping interval time；Due to there are two the settings of plunger 21, two plungers 21
The symmetry axis both sides with net-changing device cavity 26 are symmetrical arranged, one is can be used and changes one with pattern, in draping and backwash process, material
Flowing pressure is unchanged, flow speed stability, and no moment cutout, no melt leakage can long-time continuous production；In primary automatic cleaning filter
For network process, it can be achieved that cleaning the purpose of strainer, backwash efficiency is high, and production is avoided to pause, and Increasing Production and Energy Saving saves production cost；Greatly
Width reduces draping frequency, avoids frequent draping.
As illustrated in figs. 8-11, the filtering accuracy of the second filter is 20-40 microns, is included at least by cylindric hollow
Body 5 and central control system are provided with filter recoil axis 6, filtering disc 71, filter screen 72 and support frame 73 in the cylinder 5,
The center of filter recoil axis 6 is hollow discharging channel 62, and 62 bottom of discharging channel carries blow-off valve.Specifically, in cylinder 5
Axial location is provided with the big channel 53 of hollow cylindrical, and 53 side wall upper edge its short transverse of big channel offers multigroup inlet opening,
Every group of inlet opening includes symmetrically arranged multiple inlet openings in same level；It can be equipped with up or down in big channel 53
Filter recoil axis 6, filter recoil axis 6 are equipped with multigroup recoil channel along its short transverse, and every group of recoil channel includes multiple cross
To setting, symmetrical laterally recoil channel 61, channel 61 of laterally recoiling is connected with the discharging channel 62 inside filter recoil axis 6
It is logical；The top of filter recoil axis 6 is equipped with filtering disc 71, which is the sintering felt or seat type net of annular shape,
Its outer diameter is adapted to 53 internal diameter of big channel, and is sealed and coordinated with big channel 53.
Support frame 73 includes centered on big channel 53, the upper supporting network 731 of upper and lower parallel laying and lower supporting network
732, the fixing piece 733 for connecting upper supporting network 731 and lower 732 end of supporting network, multiple upper supporting networks 731 and lower supporting network
732 are arranged into the S-type support frame 73 in section, and filter screen 72 is mounted between upper supporting network 731 and lower supporting network 732, from
And it filters disc 71, filter screen 72 and support frame 73 and forms multiple S types melt flow channels 74, melt flow channel 74 and inlet opening face
Unicom is arranged.Also there are the gaps 54 for the flowing of filtered liquid between 73 outside of support frame and 5 inner wall of cylinder.
5 bottom of cylinder is provided with the melt inlet 51 with inlet valve, and pressure sensor 3 is provided at melt inlet 51,
It incudes the feed pressure of melt and is more than 65bar, and drainage conduit 511 is also equipped at melt inlet 51；1 top of cylinder is provided with band
There is the melt outlet 52 of outlet valve, pressure sensor 4 is again provided at melt outlet 52, the feed pressure for incuding melt is big
Exhaust outlet 521 is further opened at 4bar, melt outlet 52.
When being filtered, laterally recoil channel 61 and inlet opening are interlaced, i.e., laterally recoil channel 61 and big channel 53
Inner wall offset, to laterally recoil channel 61 be closed, at this time melt by melt inlet 51 enter melt flow channel
74, it is upward through the gap 54 between 5 inner wall of support frame 73 and cylinder in the direction of the arrow downwards after the filtering of filter screen 72
Flowing, finally from 52 outflow filter of melt outlet.
In order to ensure the stability of filtering, before melt enters filter by melt inlet 51, melt inlet is first closed
51 inlet valve is discharged a part by drainage conduit 511 and feeds unstable melt, inlet valve is opened again after charging is stablized,
Melt is allowed to normally enter filter, specifically, in this present embodiment, ensureing that the feed flow rate of melt is 0.2-2t/h；First at this time
The outlet valve of melt outlet 52 is kept to be closed, it, gradually will be in filter with the entrance of melt by Exhaust Open
Gas emptied by exhaust outlet, until cylinder 5 in be full of melt, exhaust outlet 521 is closed, and outlet valve is opened, carry out
Normal filtration.Above-mentioned action forms a protective program, and good protective effect is played to filter.
The bottom end of filter recoil axis 6, which is equipped with, to be connected with central control system, for controlling filter recoil 6 displacement distance of axis
Stroke sensor；5 bottom of cylinder is equipped with the locator being connected with central control system.
After filtering carries out a period of time, it is located at the pressure difference of two pressure sensors of melt inlet 51 and melt outlet 52
When reaching 40bar, signal is sent to central control system, control blow-off valve is opened after central control system receives pressure difference signal, while mistake
Filter recoil axis 6 moves down, when being moved to filter recoil axis 6 the lowermost laterally recoil channel and 5 bottommost of cylinder
When melt flow channel is connected, locator sends the recoil stopping of axis 6 of signal controlling filter to control unit to be continued to move down, and is write from memory
It is 0 point to recognize at this, starts backwash action, and filtered melt is flowed from cylinder top down at this time, will by filter screen 72
The attachment gathered on filter screen 72 washes away downwards, the liquid after washing away from inlet opening of the melt flow channel 74 through excessive channel 53,
It is discharged again from 62 bottom of discharging channel of filter recoil axis 6 by channel 61 of laterally recoiling.When filter recoils axis 6 at 0 point
After position stops 10-60s, central control system controlling filter recoil axis 6 is begun to move up, and mobile distance is by stroke sensor
Control, is backwashed from bottom to top successively, until completing the backwash of all filter screens, blow-off valve is closed.Specifically, working as
When support frame has 100 groups, filter recoil axis is provided with 4 groups of laterally recoil channels, and the axis of filter recoil at this time needs to move
25 times, complete a complete backwash process.In this present embodiment, the quantity of the quantity and melt flow channel in lateral recoil channel
Ratio≤10%, preferably 10%, to reduce pressure oscillation when recoiling, as shown in table 1, even if when recoil, normal melt channel
Also reaching 90% or more, pressure oscillation is less than 10%, and 10% pressure oscillation is adjusted by the first booster pump and the second booster pump,
Ensure the continual and steady progress of filtering.
The influence of 1 filter screen quantity of table and filter recoil number of axle ratio to filtering
The outside of cylinder 5 is provided with chuck (not shown), chuck coats the outer wall setting of entire cylinder 5, the folder
The temperature of set is 260-330 DEG C, to ensure that the melt in cylinder 5 can guarantee higher temperature in filter process.
The operating procedure of the filtration system of the present invention includes the following steps：
1) pressure difference between first filter pressure at both sides sensor 1 and pressure sensor 2 is set as 10-40bar, if
The pressure difference of fixed second filter pressure at both sides sensor 3 and pressure sensor 4 is 30-100bar, sets the of any road
The recoil frequency values of tow filtrator are 2-20 times/day；
2) the first booster pump is adjusted so that the inlet pressure of first filter melt is more than 65bar；
3) blow-off valve for closing the second filter opens drainage conduit and carries out discharge 10-80 minutes, opens exhaust outlet, fusion
Body enters big channel with the flow velocity of 0.2-2t/h from inlet valve, and enters melt flow channel by the inlet opening of big channel side wall and carry out
It filters step by step, when melt is full of entire cylinder, closes exhaust outlet and continue to filter；
4) outlet pressure of the second filter is kept to be more than 40bar；
5) when the pressure difference superelevation setting value of first filter pressure at both sides sensor, first filter starts recoil
It washes, while control unit adjusts the first booster pump and increases flux, the second booster pump is adjusted to maintain the liquid outlet of first filter
It is constant to locate pressure, maintains 20-200bar, first filter is in normal filtration state；
6) first filter completes backwash and carries out normal filtration, when the pressure difference of the second filter pressure at both sides sensor
When superelevation setting value, the second filter starts backwash, and central control system controls blow-off valve and opens, under filter recoil axis is automatic
It moves, is laterally communicated with the melt flow channel of cylinder bottommost in recoil channel positioned at filter recoil axis the lowermost, melt recoiled
Strainer enters filter recoil axis discharge through laterally recoil channel, completes the backwash of Partial filtration net；Filter recoil is axial
Upper movement, until completing the backwash of all filter screens；Control unit adjusts the first booster pump simultaneously and the second booster pump synchronizes
Increase flux；
7) first filter normal filtration, when monitoring that the recoil frequency of the second filter is higher than setting value, control system
It adjusts multiple-way valve to guide the melt of the branch to another branch, be filtered by spare second filter；
8) it repeats the above process and completes filter progress.
Experimental data explanation
Melt is into before filter：Caliber 25-100mm, 290-298 DEG C of pipe temperature, intrinsic viscosity 0.68dl/g, movement are viscous
250-300Pa ˙ S are spent, flow velocity 1.5-3m/min, b value 3, impurity content (is calculated, 0.45%) with ash content.
Be utilized respectively first filter individually filters, the second filter individually filters, the present invention combination filtering, obtain melt
Filtrate.
* 1 final products impurity content：Final products impurity content is indicated with ash content, has reacted the good job of filter effect.*
2b values：The champac index of polyester product has reacted polyester because temperature increases degradation situation.
Above-mentioned specific implementation mode is used for illustrating the present invention, rather than limits the invention, the present invention's
In spirit and scope of the claims, to any modifications and changes that the present invention makes, the protection model of the present invention is both fallen within
It encloses.
Claims (10)
1. a kind of filtration system, at least by sequentially connected first booster pump, first filter, the second booster pump, the second filtering
Device and control unit composition；
The first filter is twin columns backpulsing draping filter (2), includes plunger (21), the plunger (21) one
End is inserted into filter screen cavity, and the other end is connected with hydraulic cylinder (28)；The plunger (21) is communicated with filter screen cavity, mistake
It is diamond shape melt canal in strainer cavity, is provided with pressure sensor and melt inlet (261), pressure sensor and melt outlet
(264)；The filter screen cavity is provided with backwash channel (251), the diamond shape melt canal and backwash channel (251)
Formation intermeshes and communicates two states；
Second filter is melt automatic recoil filter, is included at least by cylindric cylinder (5) and central control system,
The cylinder (5) is provided centrally with filter recoil axis (6), filtering disc (71), filter screen (72) and support frame (73)；
Described cylinder (5) bottom is equipped with melt inlet (51), and top is provided with melt outlet (52), the melt inlet (51) and
Melt outlet is provided with pressure sensor at (52)；It is anti-it to be provided with multiple symmetrical transverse directions on the filter recoil axis (6)
Rush channel (61)；The support frame (73) forms multiple S types melt flow channels (74)；Described lateral recoil channel (61) and
Melt flow channel (74) formation intermeshes and communicates two states one by one；
Described control unit respectively with positioned at first filter both sides two pressure sensors, positioned at the second filter both sides
Pressure sensor, the first booster pump, first filter, the second booster pump, the second filter are connected, in the feed liquor of first filter
When the pressure difference of two pressure sensors at mouth and liquid outlet reaches setting value, it is anti-that control unit detects that first filter carries out
When flushing, adjusts the first booster pump and increase flux；Two pressure sensors at the inlet and liquid outlet of the second filter
Pressure difference when reaching setting value, when control unit detects that the second filter is backwashed, adjust the first booster pump and second
Booster pump, which synchronizes, increases flux；Control unit is additionally operable to control first filter and the non-concurrent startup backwash journey of the second filter
Sequence.
2. filtration system according to claim 1, it is characterised in that：Second filter is at least two, work
When, laterally recoil channel (61) intermeshes with melt flow channel (74), and laterally recoil channel (61) closing, and melt is through melt inlet
Into melt flow channel (74), downwards through filter screen (72), the second filter is flowed upwards out；When recoil, central control system control filtering
Device recoils, and axis (6) is mobile, and lateral recoil channel (61) communicates one by one with melt flow channel (74), melt flushing-back filtering net
(72), enter filter recoil axis (6) through laterally recoil channel (61) to be discharged.
3. filtration system according to claim 2, it is characterised in that：At least two second filters are arranged not
Same branch road, is connected with the second booster pump (12) respectively by multiple-way valve.
4. filtration system according to claim 1, it is characterised in that：The melt inlet (51) of second filter and molten
It is provided with pressure sensor at body outlet (52), when pressure difference reaches setting value, central control system is according to pressure difference signal controlling filter
The blow-off valve of recoil axis (6) bottom is opened and controlling filter recoil axis (6) is mobile, and central control system is recoiled by setting filter
Axis (6) shift position communicates to control laterally recoil channel (61) with melt flow channel (74), when central control system is stopped by being arranged
Between come controlling filter recoil axis (6) displacement distance.
5. filtration system according to claim 1, it is characterised in that：It is provided with folder outside the cylindric cylinder (5)
The temperature of set, the chuck is 250-270 DEG C.
6. filtration system according to claim 1, it is characterised in that：It is set at the melt inlet (51) of second filter
There is drainage conduit (511).
7. filtration system according to claim 1, it is characterised in that：It is set at the melt outlet (52) of second filter
There is exhaust outlet (521).
8. filtration system according to claim 1, it is characterised in that：The filtering accuracy of first filter device is 20-
60 microns；The filtering accuracy of second filter device is 20-40 microns.
9. filtration system according to claim 1, it is characterised in that：The quantity and melt of laterally recoil channel (61)
Quantitative proportion≤10% of runner (74).
10. a kind of operating procedure of filtration system, it is characterised in that include the following steps：
1) pressure difference of first filter pressure at both sides sensor is set as 10-40bar, and the second filter pressure at both sides of setting senses
The pressure difference of device is 30-100bar, sets the recoil frequency values of the second filter of any road；
2) the first booster pump is adjusted so that the inlet pressure of first filter melt is more than 65bar；
3) blow-off valve for closing the second filter opens drainage conduit and carries out discharge 10-80 minute, opening exhaust outlet, wait for melt with
The flow velocity of 0.2-2t/h enters big channel from inlet valve, and enters melt flow channel by the inlet opening of big channel side wall and carry out step by step
Filtering closes exhaust outlet and continues to filter when melt is full of entire cylinder；
4) when the pressure difference superelevation setting value of first filter pressure at both sides sensor, first filter starts backwash, together
When control unit adjust the first booster pump and increase flux, the second booster pump adjusts pressure at liquid outlet to maintain first filter
Constant, first filter is in normal filtration state；
5) first filter completes backwash and carries out normal filtration, when the pressure difference superelevation of the second filter pressure at both sides sensor
When setting value, the second filter starts backwash, and central control system controls blow-off valve and opens, and filter recoil axis moves down automatically, horizontal
It is communicated one by one with melt flow channel to recoil channel, melt flushing-back filtering net (4), it is anti-to enter filter through laterally recoil channel (21)
Axis (2) discharge is rushed, while control unit adjusts the first booster pump and the second booster pump synchronizes and increases flux；
6) first filter normal filtration, when monitoring that the recoil frequency of the second filter is higher than setting value, control system is adjusted
Multiple-way valve guides the melt of the branch to another branch, is filtered by spare second filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810338279.2A CN108556305B (en) | 2018-04-16 | 2018-04-16 | Filtering system |
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| CN109648823A (en) * | 2019-01-18 | 2019-04-19 | 广东宝路盛精密机械有限公司 | A kind of pressure system and its control method of parallel double-screw extruder |
| CN109778326A (en) * | 2019-01-21 | 2019-05-21 | 浙江绿宇环保股份有限公司 | Polyester waste material regenerates directly spinning filament spun-bonded needle punched non-woven fabrics production technology |
| CN117774272A (en) * | 2024-02-26 | 2024-03-29 | 张家港禾福新材料科技有限公司 | Plastic master batch production process control method and system |
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