CN110789025A - Special filter for PVC hot melt - Google Patents

Special filter for PVC hot melt Download PDF

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Publication number
CN110789025A
CN110789025A CN201911242070.7A CN201911242070A CN110789025A CN 110789025 A CN110789025 A CN 110789025A CN 201911242070 A CN201911242070 A CN 201911242070A CN 110789025 A CN110789025 A CN 110789025A
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CN
China
Prior art keywords
sealing ring
filter
pvc
special steel
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911242070.7A
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Chinese (zh)
Inventor
赵义科
赵景阳
张子琦
刘松山
张长玉
张伟杰
杨静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhengzhou United Electric Co Ltd
Original Assignee
Zhengzhou United Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhengzhou United Electric Co Ltd filed Critical Zhengzhou United Electric Co Ltd
Priority to CN201911242070.7A priority Critical patent/CN110789025A/en
Publication of CN110789025A publication Critical patent/CN110789025A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/022—Melting the material to be shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention discloses a special filter for PVC hot melt, which comprises a filter body and a heating device, wherein the filter body comprises a feeding part with a feeding channel and a discharging part with a discharging channel, a filtering part driven by a power source is arranged between the feeding channel and the discharging channel, and the filtering part is sealed with the feeding channel and the discharging channel through sealing parts. The invention has the advantages that the structure is ingenious, the design is reasonable, the blank that PVC growth lines at home and abroad do not have special filters is filled, the qualification rate and the quality of products are improved, the production efficiency is also improved, the energy consumption is reduced, the replacement time of a filter screen can be shortened to the maximum extent (the replacement time is shortened to be within 1 minute), and the solidification phenomenon of a PVC melt in the screen replacement process is effectively avoided; meanwhile, the special steel sliding plate, the first special steel sealing ring and the second special steel sealing ring are good in wear resistance, and the service life of the filter body is prolonged.

Description

Special filter for PVC hot melt
Technical Field
The invention relates to a melt filter, in particular to a special filter for PVC hot melt.
Background
In the production process of hot melts such as PP, PE, PVC, etc., mechanical impurities inevitably occur in the hot melt, so a filter is usually added between an extruder and a forming die, and the hot melt is filtered and homogenized by the filter. Compared with PP hot melt and PE hot melt, the melting point of the PVC melt is usually within 120-200 ℃, the PVC melt can age and solidify after staying for twenty minutes at most at the melting point temperature, and the PVC melt is temperature sensitive plastic accepted by the plastic industry and has strict requirements on the filtering time.
At present, a special filter is not arranged in a PVC plastic production line, the adopted filter is a traditional plate filter, the plate filter has poor sealing performance and poor liquid leakage performance, and the service life is short due to poor wear resistance; the number of connecting dead corners in the filtering channel is large, and meanwhile, due to the fact that the residence time of the PVC melt is short, the aging phenomenon inevitably occurs at the dead corners in the filtering process, and the quality of the PVC melt is reduced; because the filter screen passes through connecting piece fixed mounting inside the filter, need frequently dismantle the die when changing the filter screen, intensity of labour is big, and extruder downtime is long, and then reduces the productivity of whole production line to because PVC fuse-element dwell time is short, trade the net time in case exceed its dwell time will lead to PVC hot melt to solidify at filtering the passageway, and then influence the normal operating of whole production line.
Disclosure of Invention
The invention aims to provide the special filter for the PVC hot melt, which is high-temperature resistant, high in wear resistance, good in sealing performance and simple and quick in filter screen replacement, shortens the downtime of an extruder, and improves the productivity and product quality of a PVC plastic production line.
In order to achieve the purpose, the invention adopts the following technical scheme:
the special filter for the PVC hot melt comprises a filter body for filtering the PVC melt and a heating device for heating and insulating the filter body, wherein the filter body comprises
The feeding part is provided with a feeding channel which is communicated with the outlet of the extruder;
the discharging part is provided with a discharging channel, and the discharging channel is communicated with an inlet of the forming die;
the filtering part is arranged between the feeding channel and the discharging channel and is used for filtering and homogenizing the PVC melt discharged from the extruder;
the power source is connected with the filtering part into a whole through a connecting piece and is used for driving the filtering part to move back and forth; the sealing part comprises a first sealing piece arranged at the bottom of the feeding channel and a second sealing piece arranged at the top of the discharging channel, and is used for ensuring the sealing performance of the filter body and preventing PVC melt from flowing out of the filter body during filtering;
the PVC melt discharged from the extruder enters the feeding channel, is filtered by the filtering part and then enters the forming die through the discharging channel; when the filter part needs to be replaced, the power source drives the connecting piece to move outwards along a sliding channel between the feeding part and the discharging part, and the filter part is pushed out.
The power source is a hydraulic cylinder or an air cylinder which is arranged on the outer side of the filter body.
The power source is a hydraulic cylinder, and a cylinder body of the hydraulic cylinder is fixedly connected with the filter body through a connecting frame.
The connecting piece is a special steel sliding plate, one end of the connecting piece is fixedly connected with a piston rod of the hydraulic cylinder or the air cylinder, the other end of the connecting piece extends into the sliding channel, and a limiting block in a T-shaped structure is inserted at the other end of the sliding channel and used for limiting the special steel sliding plate.
The special steel sliding plate positioned in the sliding channel is provided with a step-shaped mounting hole, and the filtering part comprises a porous supporting block clamped in the step-shaped mounting hole and a filtering net horizontally arranged on the upper surface of the porous supporting block.
The first sealing element comprises a first special steel sealing ring consisting of a first sealing ring and a second sealing ring, and the first special steel sealing ring is of a step-shaped structure with a small front part and a big rear part; the second sealing ring is clamped in the convex groove of the feeding channel, the front surface of the second sealing ring is connected with the bottom wall of the convex groove in a sealing mode through an elastic metal sealing ring, and the rear surface of the second sealing ring is connected with the front surface of the special steel sliding plate in a sealing and sliding mode; the outer ring surface of the first sealing ring is in sealing fit with the side wall of the feeding channel, and the inner surface of the first sealing ring extends outwards from the top of the inner ring surface of the second sealing ring in an inclined mode to the front portion of the outer ring surface of the second sealing ring to form a conical connecting port connected with the feeding channel.
The rear surface of the first special steel sealing ring is provided with first filling grooves in an annular structure at intervals, and a graphite sealing ring is clamped in the first filling grooves and used for sealing the special steel sliding plate and the first special steel sealing ring together so as to prevent PVC melt from overflowing.
The section of the elastic metal sealing ring is of a V-shaped structure with an inward opening.
The second sealing element is a second special steel sealing ring clamped at the top of the discharging channel, a second filling groove in an annular structure is formed in the front surface of the second sealing element at intervals, and the special steel sliding plate and the second special steel sealing ring are sealed together by a graphite sealing ring clamped in the second filling groove, so that the overflow of PVC melt is prevented.
The heating device comprises a first heater attached to the upper surface of the filter body and a second heater attached to the lower surface of the filter body, and is used for heating and insulating the filter body.
The invention has the advantages that the structure is ingenious, the design is reasonable, the blank that PVC growth lines at home and abroad do not have special filters is filled, the qualification rate and the quality of products are improved, the production efficiency is also improved, the energy consumption is reduced, the replacement time of a filter screen can be shortened to the maximum extent, and the solidification phenomenon of a PVC melt in the screen replacement process is effectively avoided; meanwhile, the special steel sliding plate, the first special steel sealing ring and the second special steel sealing ring are good in wear resistance, and the service life of the filter body is prolonged. The method has the following specific advantages:
1) the special steel sliding plate, the first special steel sealing ring and the second special steel sealing ring are all made of wear-resistant and high-temperature-resistant special steel, so that the filter body has high temperature resistance and high wear resistance, and the service life of the filter body is prolonged; meanwhile, the lower surface of the graphite sealing ring on the bottom surface of the first special steel sealing ring is disconnected, the upper surface of the graphite sealing ring clamped in the upper surface of the second special steel sealing ring is disconnected, the contact area between the first special steel sealing ring and the upper surface of the special steel sliding plate and the contact area between the second special steel sealing ring and the lower surface of the special steel sliding plate are reduced, friction is reduced, and the service life of the filter body is further prolonged.
2) According to the invention, the hydraulic cylinder drives the special steel sliding plate to move back and forth left and right along the sliding channel, the filter screen of the filtering part is arranged on the special steel sliding plate, the hydraulic cylinder can push the filter screen out of the filter body quickly (within 1 second) through the special steel sliding plate, so that the quick replacement of the filter screen is realized (the replacement time is shortened within 1 minute), the downtime of the extruder is shortened to the maximum extent, the probability of aging of a PVC melt in the replacement process is effectively avoided, the automation degree and the production capacity of a growth line are improved to the maximum extent, and the production efficiency is improved.
3) The feeding channel and the first special steel sealing ring are in clearance sealing, and the non-elastic automatic compensation sealing of the feeding channel and the first special steel sealing ring is realized through the pressure of the PVC melt, so that the sealing effect is good, and the dripping leakage is effectively avoided; simultaneously, the conical connector of the first special steel sealing ring is in dead-angle-free contact with the feeding channel, so that solidification at the dead angle can be prevented.
4) The filtering channel composed of the feeding channel, the first special steel sealing ring, the filtering part, the second special steel sealing ring and the discharging channel realizes dead-angle-free contact connection, so that the phenomenon of solidification at dead angles caused by the existence of the dead angles is avoided, and the maintenance period of the filter body is prolonged.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a schematic sectional view taken along line a-a of fig. 1.
Fig. 4 is an enlarged schematic view of a portion B in fig. 3.
Detailed Description
The present invention takes the upward direction in fig. 1 as the upward direction, and vice versa, the leftward direction in fig. 1 as the left direction, and vice versa, the rightward direction, the upward direction in fig. 2 as the forward direction, and the downward direction in fig. 2 as the backward direction. The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 to 4, the filter specially used for PVC hot melt according to the present invention comprises a filter body for filtering PVC melt and a heating device for heating and insulating the filter body;
the heating device comprises a first heater 1.1 attached to the upper surface of the filter body and a second heater 1.2 attached to the lower surface of the filter body, and the first heater 1.1 and the second heater 1.2 are connected into an electric cabinet of the extruder to heat and preserve heat of the PVC melt flowing out of the extruder;
the filter body comprises a feeding part 2.1 which is fixedly connected with the outlet of the extruder through bolts and is provided with a feeding channel 2.2 communicated with the outlet of the extruder;
the discharging part 3.1 is fixedly connected at an outlet of the forming die through a bolt, and is provided with a discharging channel 3.2 communicated with an inlet of the forming die, and the discharging channel 3.2 is communicated with the feeding channel 2.2;
the filtering part is arranged between the feeding channel 2.2 and the discharging channel 3.2 and is used for filtering and homogenizing PVC melt discharged from the extruder;
the power source is connected with the filtering part into a whole through a connecting piece and is used for driving the filtering part to move back and forth; the sealing part comprises a first sealing piece arranged at the bottom of the feeding channel 2.2 and a second sealing piece arranged at the top of the discharging channel 3.2, and is used for ensuring the sealing performance of the filter body and preventing PVC melt from flowing out of the filter body during filtering;
the feeding channel 2.2, the filtering part and the discharging channel 3.2 are communicated, PVC melt from the extruder enters the feeding channel 2.2, and enters the forming die from the discharging channel 3.2 after being filtered by the filtering part; when the filter part needs to be replaced, the power source drives the connecting piece to move outwards along the sliding channel between the feeding part 2.1 and the discharging part 3.1, and the filter part is pushed out.
As shown in fig. 1-4, the power source is a hydraulic cylinder 4.1 installed outside the filter body, the cylinder body of the hydraulic cylinder 4.1 is fixedly connected with the filter body through a connecting frame 4.2, and the hydraulic cylinder 4.1 is connected with a hydraulic station through an oil pipe;
the connecting piece is a special steel sliding plate 5 made of tool steel or high-speed tool steel, the right end of the special steel sliding plate 5 is fixedly connected with a piston rod of the hydraulic cylinder 4.1, and the left end of the special steel sliding plate slides from one end of the sliding channel to penetrate into the sliding channel from the right end of the sliding channel; a limiting block 6 in a T-shaped structure is inserted at the left end part of the sliding channel, the plugging section of the limiting block 6 extends into the sliding channel and is fixedly connected with the special steel sliding plate 5, and the limiting section at the outer end of the limiting block is blocked at the outer side of the filter body to limit the special steel sliding plate 5;
the special steel sliding plate 5 positioned in the sliding channel is provided with a step-shaped mounting hole, the filtering part comprises a porous supporting block 7.1 clamped in the step-shaped mounting hole and a filtering net 7.2 horizontally arranged on the upper surface of the porous supporting block 7.1, the filtering part, the feeding channel 2.2 and the discharging channel 3.2 are concentric, and PVC melt discharged from the feeding channel 2.2 is ensured to smoothly enter the discharging channel 3.2 after being filtered by the filtering net 7.2. When the filter screen 7.2 needs to be replaced, the hydraulic cylinder 4.1 drives the special steel sliding plate 5 and the filtering part to rapidly penetrate out of the filter body along the sliding channel (can be controlled within 1 second), so that the replacement difficulty of the filter screen 7.2 is reduced, the replacement time of the filter screen 7.2 can be shortened within 1 minute, the stop time of the extruder is shortened, the problem that a PVC melt is easy to age and solidify when the traditional filter is used for replacing the filter screen is solved, the automation degree of a growth line is improved to the greatest extent, the productivity of a production line is improved, and the production efficiency is further improved;
the first sealing element of the sealing part comprises a first special steel sealing ring 8.1 (the first special steel sealing ring 8.1 is made of die steel) consisting of a first sealing ring and a second sealing ring, the first special steel sealing ring is of a step-shaped structure with a small front part and a big back part, and the first special steel sealing ring 8.1 is of an integrally formed structure; the rear part of the feeding channel 2.2 is expanded outwards to form a convex groove, a second sealing ring is clamped in the convex groove, the front surface of the second sealing ring is in sealing connection with the top surface of the convex groove through an elastic metal sealing ring 8.2 (the section of the second sealing ring is of a V-shaped structure with an inward opening), the front surface of the second sealing ring is arranged in a gap with the feeding channel 2.2 and is sealed through the elastic metal sealing ring 8.2, the outer ring surface of the first sealing ring is in sealing fit with the side wall of the feeding channel 2.2, and the inner surface of the first sealing ring extends outwards from the top of the inner ring surface of the second sealing ring in an inclined mode to form a conical connecting port; elastic automatic compensation sealing of the first special steel sealing ring 8.1 and the feeding channel 2.2 is realized by the elastic metal sealing ring 8.2 and material pressure of the PVC melt, and dead-angle-free contact connection between the conical connecting port 8.3 and the feeding channel 2.2 is realized, so that dripping of the PVC melt can be effectively avoided, and aging and solidification at the dead angle can be prevented;
the rear surface interval of second sealing ring has been seted up and has been the first packing groove I and the first packing groove II of annular structure, and the card is equipped with graphite seal circle C1 in the first packing groove I, and the card is equipped with graphite seal circle C2 in the first packing groove II, and graphite seal circle C1 and graphite seal circle C2 and special steel sliding plate 5 upper surface sealing sliding connection are passed through to the lower surface of second sealing ring. The graphite sealing ring C1 and the graphite sealing ring C2 break the surface of the second sealing ring, so that the contact area between the graphite sealing ring C1 and the special steel sliding plate 5 is reduced, the friction force is reduced, the sealing and lubricating effects are achieved, the sealing performance and the relative sliding performance between the special steel sliding plate 5 and the first special steel sealing ring 8.1 are ensured, and the PVC melt is prevented from overflowing;
the second sealing element of the sealing part is a second special steel sealing ring 9 clamped at the top of the discharge channel 3.2, a second filling groove I and a second filling groove II which are in an annular structure are arranged on the front surface of the second sealing element at intervals, a graphite sealing ring D1 is clamped in the second filling groove I, a graphite sealing ring D2 is clamped in the second filling groove II, the first special steel sealing ring 8.1 is in sealing sliding fit with the rear surface of the special steel sliding plate 5 through the graphite sealing ring, the graphite sealing ring D1 and the graphite sealing ring D2 break the surface of the second special steel sealing ring 9, the contact area between the special steel sealing ring and the special steel sliding plate 5 is reduced, friction force is reduced, the sealing and lubricating effects are achieved, the sealing performance and the relative sliding performance of the special steel sliding plate 5 and the second special steel sealing ring 9 are guaranteed, and PVC melt is prevented from overflowing;
the conical connector 8.3 at the front part of the first special steel sealing ring 8.1 is connected with the feeding channel 2.2 in a dead-angle-free contact mode, the upper part of the porous supporting block 7.1 is connected with the inner annular surface of the first special steel sealing ring 8.1 in a dead-angle-free contact mode, the bottom of the porous supporting block 7.1 is connected with the discharging channel 3.2 in a dead-angle-free contact mode, and therefore ageing at the dead angle is avoided to the maximum extent.
During actual processing, the first special steel sealing ring 8.1, the special steel sliding plate 5 and the second special steel sealing ring 9 are all made of die steel, have the characteristics of high temperature resistance and wear resistance, and prolong the service life of the filter body.
When the device works, an installation directional diagram 1 of the filter body is shown, namely a feeding channel and a discharging channel are horizontal channels, raw materials are plasticized and melted by an extruder and then become high-temperature PVC melt, the high-temperature PVC melt enters the feeding channel 2.2 from an outlet of the extruder, the pure PVC melt filtered by a filter screen 7.2 flows into the discharging channel 3.2 from a plurality of through holes of a porous supporting block 7.1, and finally enters a forming die from the discharging channel 3.2 for subsequent processing; in the filtering process, the first heater 1.1 and the second heater 1.2 heat the filter body, so that the temperature of the high-temperature PVC melt in the filtering process is ensured, and solidification is avoided;
when the filter screen 7.2 is blocked by too much impurities on the filter screen 7.2, the extruder is closed; the hydraulic cylinder 4.1 works to push the special steel sliding plate 5 to slide leftwards along the sliding channel, so that the filter screen 7.2 quickly slides out of the filter body (the sliding-out time can be controlled within 1 second), and a new filter screen 7.2 is replaced, and in the replacement process, because the length of the special steel sliding plate 5 is greater than that of the sliding channel, after the filter screen 7.2 moves to the outer side of the filter body, the special steel sliding plate 5 positioned on the right side of the filter screen 7.2 is in sealing fit with the first special steel sealing ring 8.1 and is used for plugging the feeding channel 2.2 and preventing PVC melt from leaking; after the replacement is finished, the hydraulic cylinder 4.1 drives the special steel sliding plate 5 and the filtering part to move rightwards to the initial position, the limiting block 6 continues to block the sliding channel, and the replacement operation of the filter screen 7.2 is finished.
In the description of the present invention, it should be noted that the terms "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Claims (10)

1. A special filter for PVC hot melt is characterized in that: comprises a filter body for filtering PVC melt and a heating device for heating and insulating the filter body, wherein the filter body comprises
The feeding part is provided with a feeding channel which is communicated with the outlet of the extruder;
the discharging part is provided with a discharging channel, and the discharging channel is communicated with an inlet of the forming die;
the filtering part is arranged between the feeding channel and the discharging channel and is used for filtering and homogenizing the PVC melt discharged from the extruder;
the power source is connected with the filtering part into a whole through a connecting piece and is used for driving the filtering part to move back and forth; the sealing part comprises a first sealing piece arranged at the bottom of the feeding channel and a second sealing piece arranged at the top of the discharging channel, and is used for ensuring the sealing performance of the filter body and preventing PVC melt from flowing out of the filter body during filtering;
the PVC melt discharged from the extruder enters the feeding channel, is filtered by the filtering part and then enters the forming die through the discharging channel; when the filter part needs to be replaced, the power source drives the connecting piece to move outwards along a sliding channel between the feeding part and the discharging part, and the filter part is pushed out.
2. The special filter for PVC hot melt as claimed in claim 1, characterized in that: the power source is a hydraulic cylinder or an air cylinder which is arranged on the outer side of the filter body.
3. The special filter for PVC hot melt as claimed in claim 2, characterized in that: the power source is a hydraulic cylinder, and a cylinder body of the hydraulic cylinder is fixedly connected with the filter body through a connecting frame.
4. The special filter for PVC hot melt as claimed in claim 3, characterized in that: the connecting piece is a special steel sliding plate, one end of the connecting piece is fixedly connected with a piston rod of the hydraulic cylinder or the air cylinder, the other end of the connecting piece extends into the sliding channel, and a limiting block in a T-shaped structure is inserted at the other end of the sliding channel and used for limiting the special steel sliding plate.
5. The special filter for PVC hot melt according to claim 4, characterized in that: the special steel sliding plate positioned in the sliding channel is provided with a step-shaped mounting hole, and the filtering part comprises a porous supporting block clamped in the step-shaped mounting hole and a filtering net horizontally arranged on the upper surface of the porous supporting block.
6. The special filter for PVC hot melt according to claim 5, characterized in that: the first sealing element comprises a first special steel sealing ring consisting of a first sealing ring and a second sealing ring, and the first special steel sealing ring is of a step-shaped structure with a small front part and a big rear part; the second sealing ring is clamped in the convex groove of the feeding channel, the front surface of the second sealing ring is connected with the bottom wall of the convex groove in a sealing mode through an elastic metal sealing ring, and the rear surface of the second sealing ring is connected with the front surface of the special steel sliding plate in a sealing and sliding mode; the outer ring surface of the first sealing ring is in sealing fit with the side wall of the feeding channel, and the inner surface of the first sealing ring extends outwards from the top of the inner ring surface of the second sealing ring in an inclined mode to the front portion of the outer ring surface of the second sealing ring to form a conical connecting port connected with the feeding channel.
7. The special filter for PVC hot melt according to claim 6, characterized in that: the rear surface of the first special steel sealing ring is provided with first filling grooves in an annular structure at intervals, and a graphite sealing ring is clamped in the first filling grooves and used for sealing the special steel sliding plate and the first special steel sealing ring together so as to prevent PVC melt from overflowing.
8. The special filter for PVC hot melt according to claim 6, characterized in that: the section of the elastic metal sealing ring is of a V-shaped structure with an inward opening.
9. The special filter for PVC hot melt according to claim 6, characterized in that: the second sealing element is a second special steel sealing ring clamped at the top of the discharging channel, a second filling groove in an annular structure is formed in the front surface of the second sealing element at intervals, and the special steel sliding plate and the second special steel sealing ring are sealed together by a graphite sealing ring clamped in the second filling groove, so that the overflow of PVC melt is prevented.
10. The special filter for PVC hot melt as claimed in claim 1, characterized in that: the heating device comprises a first heater attached to the upper surface of the filter body and a second heater attached to the lower surface of the filter body, and is used for heating and insulating the filter body.
CN201911242070.7A 2019-12-06 2019-12-06 Special filter for PVC hot melt Pending CN110789025A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911242070.7A CN110789025A (en) 2019-12-06 2019-12-06 Special filter for PVC hot melt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911242070.7A CN110789025A (en) 2019-12-06 2019-12-06 Special filter for PVC hot melt

Publications (1)

Publication Number Publication Date
CN110789025A true CN110789025A (en) 2020-02-14

Family

ID=69447753

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911242070.7A Pending CN110789025A (en) 2019-12-06 2019-12-06 Special filter for PVC hot melt

Country Status (1)

Country Link
CN (1) CN110789025A (en)

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