Backwash screen exchanger

Abstract

The utility model discloses a backwashing screen exchanger, and relates to the technical field of screen exchangers. Comprising a screen changer base, a sliding plate arranged on the screen changer base in a sliding mode, a hole site formed in the sliding plate, a flow channel formed in the screen changer base, a mounting plate arranged on one side of the screen changer base and a first driving mechanism arranged on the mounting plate and used for driving the sliding plate. The back washing bin, the slag discharging channel and the sliding groove are arranged in the screen exchanger base, and the flow dividing sliding block and the second driving mechanism are arranged in the sliding groove in a sliding mode. A back-flushing channel is arranged on the flow-dividing sliding block, the second driving mechanism drives the flow-dividing sliding block to slide between a first position where the flow channel is communicated with the back-flushing bin and a second position where the flow channel is disconnected from the back-flushing bin, and part of the flow-dividing sliding block extends into the flow channel when the flow-dividing sliding block is located at the first position. According to the utility model, the flow of the flow channel is changed through the shunting slide block, so that part of materials enter the backwashing channel and the backwashing bin to be washed, the backwashing force is stable, and the cleaning effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to a screen changer technical field especially relates to a backwash screen changer. BACKGROUND

[0002] Screen changer is a manual or automatic switching device including one or more filter screens, for filtering out foreign particles and impurities when the plastic material flows through the filter screen. The working mechanism of the extruder is to rely on internal pressure and shear force, which can make the material fully plasticize and uniformly mix, and form through the die; so sometimes a series of processes such as mixing, plasticizing and forming can be completed at the same time by using one extruder, so as to carry out continuous production. In the discharging process, the impurities in the melt need to be filtered out by screen changer. However, the traditional automatic screen changer of extruder is unstable, which affects the work efficiency.

[0003] The patent document with application number 201320472258.2 discloses a plate type pulsating backwash screen changer. When the filter screen of the first working position needs to be changed, the backwash cylinder is started to pull the backwash plunger to guide the material, so that the clean material enters the backwash bin. At this time, the backwash cylinder button is started to wash the screen of the second working position. The impurities attached to the filter screen are discharged from the inlet end after being backwashed by the backwash cylinder. Then the working main cylinder is started to push (or pull back) the reciprocating slide plate, and the backwash is completed. Although the screen changer can solve the problem of unstable screen changing, the discharge flow of the discharge cavity is not adjusted during the screen changing and backwashing process, which causes the material flow entering the backwash bin to be small. At the same time, part of the material will be discharged from the backwash bin back to the discharge cavity during the backwash process of the backwash cylinder, only part of the material is backwashed by the backwash cylinder, which causes the backwash force to be unstable and the backwash effect to be poor. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a backwash screen changer with stable backwash force and good washing effect.

[0005] The technical scheme adopted by the utility model to solve the technical problem is that the backwash screen changer comprises a screen changer base, a sliding plate slidingly arranged on the screen changer base, a hole position for mounting a filter screen arranged on the sliding plate, a flow channel arranged on the screen changer base, a mounting plate arranged on one side of the screen changer base, and a first driving mechanism arranged on the mounting plate for driving the sliding plate,

[0006] It also comprises a backwash bin arranged in the screen changer base, a deslagging channel, a sliding chute, a shunt sliding block slidingly arranged in the sliding chute, and a second driving mechanism.

[0007] The backflushing channel is arranged on the shunt slider, the second driving mechanism drives the shunt slider to slide between a first position in which the flow channel and the backflushing bin are communicated and a second position in which the flow channel and the backflushing bin are disconnected, and part of the shunt slider extends into the flow channel when in the first position.

[0008] Further, the hole positions are a plurality of, and the plurality of hole positions are uniformly distributed along the sliding direction of the sliding plate.

[0009] Further, when in the second position, the shunt slider is flush with the inner wall surface of the flow channel.

[0010] Further, when in the first position, the area of the part of the shunt slider extending into the flow channel accounts for 1 / 4-1 / 3 of the cross-sectional area of the flow channel.

[0011] Further, the shunt slider comprises a slider body part, a connecting part and a shunt part, the connecting part is connected between the slider body part and the shunt part, and one side of the shunt slider is connected to the second driving mechanism.

[0012] Further, the backflushing channel is L-shaped.

[0013] Further, the backflushing bin is arranged on one side of the flow channel and above the sliding plate, and a connecting channel is communicated with the lower part of the backflushing bin; when in the first position, the backflushing channel is communicated with the connecting channel.

[0014] Further, a filter screen fixing piece is arranged in the hole position.

[0015] The backflushing screen changer comprises a backflushing bin, a residue discharging channel, a chute, a shunt slider and a second driving mechanism arranged in a screen changer base, a backflushing channel is arranged on the shunt slider, the second driving mechanism drives the shunt slider to slide between a first position and a second position, and the flow channel and the backflushing bin are communicated when in the first position, at this time, part of the shunt slider extends into the flow channel, thereby reducing the flow area so that part of the material enters the backflushing channel and the backflushing bin to be flushed after the pressure increases, the filter screen is backflushed in the backflushing bin, and then is discharged by the residue discharging channel to complete backflushing. The utility model discloses a shunt slider to change the flow of the flow channel, so that part of the material enters the backflushing channel and the backflushing bin to be flushed, the backflushing degree is stable, the cleaning effect is better, and compared with the prior art, the application sets up a micro adjustment to guide the flow, and the screen changer structure is simple and easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0017] Figure 1 It is the structure schematic diagram of the backflushing screen changer of the utility model example;

[0018] Figure 2 is a side view of the backflushing screen changer in the second position of the embodiment of the utility model;

[0019] Figure 3 is Figure 2 sectional view along A-A;

[0020] Figure 4 is a side view of the backflushing screen changer in the first position of the embodiment of the utility model;

[0021] Figure 5 is Figure 4 sectional view along A-A;

[0022] Figure 6 is a structural schematic view of the shunt slider of the embodiment of the utility model.

[0023] Explanation of reference signs:

[0024] 1, screen changer base; 11, backflushing bin; 12, deslagging channel; 13, connecting channel; 2, sliding plate; 3, hole position; 4, flow channel; 5, mounting plate; 6, first driving mechanism; 7, shunt slider; 71, slider body part; 72, connecting part; 73, shunt part; 75, backflushing channel; 8, sliding groove; 9, second driving mechanism. Specific implementation

[0025] In order to have a more clear understanding of the technical features, objects and effects of the utility model, the specific implementation of the utility model will be explained in detail by referring to the drawings.

[0026] As Figures 1-6 shown, the backflushing screen changer comprises a screen changer base 1, a sliding plate 2 slidingly arranged on the screen changer base 1, a hole position 3 for mounting a filter screen, which is opened on the sliding plate 2, a flow channel 4 opened on the screen changer base 1, a mounting plate 5 arranged on one side of the screen changer base 1, and a first driving mechanism 6 arranged on the mounting plate 5 for driving the sliding plate 2.

[0027] It also comprises a backflushing bin 11 arranged in the screen changer base 1, a deslagging channel 12, a sliding groove 8, a shunt slider 7 slidingly arranged in the sliding groove 8, and a second driving mechanism 9.

[0028] The shunt slider 7 is provided with a backflushing channel 75, the second driving mechanism 9 drives the shunt slider 7 to slide between a first position, in which the flow channel 4 and the backflushing bin 11 are connected, and a second position, in which the flow channel 4 and the backflushing bin 11 are disconnected, and part of the shunt slider 7 extends into the flow channel 4 when in the first position.

[0029] In the embodiment, the plurality of hole positions 3 are uniformly distributed along the sliding direction of the sliding plate 2, and a filter screen fixing member is arranged in the hole position 3. The filter screen fixing member can be fixed by using a mesh plate or an insert. The mesh plate and the insert are common and mature components in the industry, and thus will not be described here.

[0030] The backwashing screen changer comprises a backwashing bin 11, a slag discharge channel 12, a chute 8, a shunt slider 7 and a second driving mechanism 9 arranged in a screen changer base 1. The shunt slider 7 is provided with a backwashing channel 75. The second driving mechanism 9 drives the shunt slider 7 to slide between a first position and a second position. When the shunt slider 7 is in the first position, the flow channel 4 and the backwashing bin 11 are communicated. At this time, part of the shunt slider 7 extends into the flow channel 4, thereby reducing the flow area and causing the material to partially pass through the backwashing channel 75 into the backwashing bin 11, and the backwashing bin 11 performs backwashing on the filter screen. Then, the slag is discharged by the slag discharge channel 12, and the backwashing is completed. The utility model changes the flow of the flow channel 4 by the shunt slider 7, so that part of the material enters the backwashing channel 75 and the backwashing bin 11 for flushing. The backwashing force is stable, the cleaning effect is better, and compared with the existing technology of setting a miniature adjustment for drainage, the screen changer structure of the application is simple and easy to operate.

[0031] The shunt slider 7 slides in the chute 8 and is flush with the inner wall of the flow channel 4 when the shunt slider 7 is in the second position. At this time, the flow channel 4 is in a completely open state, and the material normally passes through the flow channel 4. When the shunt slider 7 is in the first position, the area of the shunt slider 7 extending into the flow channel 4 accounts for 1 / 4-1 / 3 of the cross-sectional area of the flow channel 4. At this time, the cross section of the flow channel 4 is reduced, the flow rate is increased, and the pressure is increased. Part of the material passes through the backwashing channel 75 into the backwashing bin. Of course, in other embodiments, the proportion can also be other values.

[0032] The shunt slider 7 comprises a slider body part 71, a connecting part 72 and a shunt part 73. The connecting part 72 is connected between the slider body part 71 and the shunt part 73. One side of the shunt slider 7 is connected to the second driving mechanism 9. In the embodiment, the backwashing channel 75 is L-shaped, the backwashing bin 11 is arranged on one side of the flow channel 4 and above the sliding plate 2, and the backwashing bin 11 is communicated with a connecting channel 13 at the lower part. When the shunt slider 7 is in the first position, the upper end of the backwashing channel 75 is communicated with the connecting channel 13.

[0033] Finally, it needs to be pointed out that in this document, relational terms such as first and second and the like can only be intended to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by an "comprising" statement serves as a means plus function alternative.

[0034] Obviously, the above-mentioned embodiments are only examples for clearly illustrating, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A backwash screen changer, comprising a screen changer base (1), a sliding plate (2) slidably arranged on the screen changer base (1), a hole (3) provided on the sliding plate (2) for installing a filter screen, a flow channel (4) provided on the screen changer base (1), a mounting plate (5) provided on one side of the screen changer base (1), and a first driving mechanism (6) provided on the mounting plate (5) for driving the sliding plate (2), characterized in that: It also includes a backwash bin (11) arranged in the screen changer base (1), a slag discharge channel (12), a chute (8), a diversion slider (7) slidably arranged in the chute (8), and a second drive mechanism (9); The diverter slider (7) is provided with a backwash channel (75), and the second driving mechanism (9) drives the diverter slider (7) to slide between a first position connecting the flow channel (4) and the backwash chamber (11), and a second position disconnecting the flow channel (4) and the backwash chamber (11), and in the first position, a portion of the diverter slider (7) extends into the flow channel (4); There are a plurality of hole positions (3), and the plurality of hole positions (3) are evenly distributed along the sliding direction of the sliding plate (2); The diverter slider (7) comprises a slider body (71), a connecting portion (72) and a diverter portion (73), wherein the connecting portion (72) is connected between the slider body (71) and the diverter portion (73), and one side of the diverter slider (7) is connected to the second driving mechanism (9); The backwash chamber (11) is arranged on one side of the flow channel (4) and is located above the sliding plate (2), and a connecting channel (13) is connected to the lower portion of the backwash chamber (11); when in the first position, the backwash channel (75) is connected to the connecting channel (13).

2. The backwash screen changer according to claim 1, characterized in that: When located at the second position, the diversion slider (7) is flush with the inner wall surface of the flow channel (4).

3. The backwash screen changer according to claim 2, characterized in that: When in the first position, the area of ​​the portion of the diversion slider (7) extending into the flow channel (4) accounts for 1 / 4-1 / 3 of the cross-sectional area of ​​the flow channel (4).

4. The backwash screen changer according to claim 1, characterized in that: The recoil channel (75) is L-shaped.

5. The backwash screen changer according to any one of claims 1 to 4, characterized in that: A filter fixing piece is provided in the hole (3).

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