A non-stop hydraulic screen changer device

Abstract

The utility model discloses a kind of hydraulic screen changer devices without shutdown, including the shell with feed channel, shell is longitudinally provided with screen changing channel, screen changing channel is sequentially provided with pre-change net plate, working net plate and waste net plate from top to bottom, waste net plate lower part is provided with baffle, pre-change net plate upper part is tightly provided with spare net plate by the hydraulic cylinder driving located above shell, feed channel upper part is provided with shunt channel, pre-change net plate direction is extended with pre-flow channel to shunt channel, pre-flow channel is extended with overflow channel with plug outside by passing pre-change net plate, shell upper part is threadedly connected with screen changing screw rod that shunt channel is opened or blocked. The utility model can make melt fill pre-change net plate after discharging from overflow channel, hydraulic cylinder drives pre-change net plate to replace the position of working net plate, pre-change net plate and melt will not mix air, influence to mould end feeding after screen changing is very small, will not cause product unqualified, ensure the continuous production and product qualified rate of product.

Description

Technical Field

[0001] This utility model relates to the field of screen changer technology, and in particular to a non-stop hydraulic screen changer device. Background Technology

[0002] In plastic product manufacturing, various raw materials contain impurities at the time of production, resulting in impurities in the melt after plastic extrusion. This affects the quality of the plastic products. Therefore, filtration devices are essential in plastic extrusion to remove impurities from the melt and ensure product quality. A screen changer is a specialized piece of equipment used in plastic sheet and film extruders. It uses a small-aperture filter to screen out larger impurities from the melt. In PP hollow board production lines, the screen changer filters residues from the raw materials. Installed between the extruder and the die, it effectively removes residues mixed in with the molten material. As production progresses, impurities gradually accumulate on the filter screen. Once the impurities reach a certain level, they clog the filter screen, requiring timely replacement with a new one.

[0003] Currently, common screen changers require stopping production before replacing the filter screen, which reduces production efficiency. Some systems use hydraulic cylinders to directly change the screen without stopping the machine. However, both of these methods experience unstable material supply to the die during screen replacement. This is because air can easily enter the screen changer when the filter screen enters, and air mixed in with the melt can lead to defective products during extrusion, resulting in a lower product yield. Utility Model Content

[0004] To address the technical problem in existing technologies where unstable material supply at the die end occurs when replacing filter screens, leading to defective products during extrusion and a reduced product qualification rate, this utility model provides the following technical solution.

[0005] This utility model discloses a non-stop hydraulic screen changer device, comprising a housing with a feeding channel, a screen changing channel longitudinally provided in the housing, and a pre-screening plate, a working screen plate, and a waste screen plate arranged sequentially from top to bottom in the screen changing channel. A blocking plate is provided at the lower part of the waste screen plate. A spare screen plate driven by a hydraulic cylinder located above the housing is pressed against the upper part of the pre-screening plate. A diversion channel is opened at the upper part of the feeding channel. A pre-flow channel extends from the diversion channel toward the pre-screening plate. The pre-flow channel extends through the pre-screening plate and extends to an overflow channel with an external plug. A screen changing screw is threadedly connected to the upper part of the housing to open or block the diversion channel.

[0006] As a further technical solution, the screen-changing screw includes a threaded portion that is threadedly connected to the housing and a blocking end that extends into the diversion channel.

[0007] As a further technical solution, a number of support rods are fixedly provided on the upper end of the housing, and a fixing plate is connected to the upper end of the support rods. The upper part of the fixing plate is connected to the hydraulic cylinder, and the output end of the hydraulic cylinder passes through the fixing plate and is connected to a lower pressure plate that presses the spare mesh plate against it.

[0008] As a further technical solution, a wire feeding component for conveying the spare wire mesh is connected to one side of the housing.

[0009] As a further technical solution, the mesh feeding component includes a frame connected to the housing and a cylinder located on one side of the frame. The output end of the cylinder passes through the side wall of the frame and is connected to a push plate for pushing the spare mesh plate.

[0010] As a further technical solution, a limiting top plate is provided on the upper part of the frame near the output end of the hydraulic cylinder.

[0011] The beneficial effects of this invention are as follows: A diversion channel, a pre-flow channel, and an overflow channel are added within the housing. The opening and closing of the diversion channel is controlled by a screen-changing screw. When screen changing is required, turning the screw allows the melt to enter the diversion channel from the feed channel and flow to the pre-flow channel. The melt then enters the pre-changing screen plate from the pre-flow channel, filling it completely before being discharged through the overflow channel. Afterward, a hydraulic cylinder drives the lower pressure plate downward, directly replacing the working screen plate with the pre-changing screen plate. This prevents air from mixing into the pre-changing screen plate and the melt, minimizing the impact on the die-end feeding after screen changing and preventing product defects, thus ensuring continuous production and a high product qualification rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the non-stop hydraulic screen changer device of this utility model;

[0013] Figure 2 This is another perspective schematic diagram of the non-stop hydraulic screen changer device of this utility model;

[0014] Figure 3 This is a partial cross-sectional schematic diagram of the housing of the non-stop hydraulic screen changer device of this utility model;

[0015] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the housing of the non-stop hydraulic screen changer device of this utility model;

[0016] In the diagram: 1-Shell; 101-Screen changing channel; 102-Diverting channel; 103-Pre-flow channel; 104-Overflow channel; 2-Feeding channel; 3-Screen changing screw; 301-Threaded part; 302-Blocking end; 4-Plug; 5-Support rod; 6-Fixing plate; 7-Hydraulic cylinder; 8-Lower pressure plate; 9-Screen inlet component; 901-Frame; 902-Cylinder; 903-Push plate; 904 Limiting top plate; 10-Spare screen plate; 11-Pre-change screen plate; 12-Working screen plate; 13-Waste screen plate; 14-Blocking plate. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] like Figure 1 As shown, this utility model discloses a non-stop hydraulic screen changer device, including a housing 1 with a feeding channel 2 and a screen changing channel 101 longitudinally arranged on the housing 1. The feeding channel 2 is used to connect the extruder and the die, and the screen changing channel 101 is used for replacing the filter screen.

[0020] like Figure 3 As shown, in a preferred embodiment, the screen changing channel 101 is provided with a pre-changing screen plate 11, a working screen plate 12, and a discarded screen plate 13 from top to bottom. A spare screen plate 10 is provided above the pre-changing screen plate 11, and a hydraulic cylinder 7 is provided above the housing 1. The hydraulic cylinder 7 presses the spare screen plate 10, and the lower part of the spare screen plate 10 abuts against the upper part of the pre-changing screen plate 11, ensuring that the pre-changing screen plate 11 is within the screen changing channel 101. At the same time, a blocking plate 14 is provided at the lower part of the discarded screen plate 13 to prevent the discarded screen plate 13 from falling off, ensuring the stability of each screen plate within the screen changing channel 101.

[0021] A diversion channel 102 is provided at the upper part of the feeding channel 2. The diversion channel 101 is vertically arranged, and a pre-flow channel 103 extends from the diversion channel 102 toward the pre-changing screen plate 11. The pre-flow channel 103 passes through the pre-changing screen plate 11 and extends to an overflow channel 104. A plug 4 is provided at the end of the overflow channel 104 away from the pre-changing screen plate 11 to block the overflow channel 104. Thus, the melt in the feeding channel 2 will enter the diversion channel 102 and flow to the pre-flow channel 103. Then, the melt enters the pre-changing screen plate 11 from the pre-flow channel 103. After the melt fills the pre-changing screen plate 11, it will be discharged from the overflow channel 104. After the pre-changing screen plate 11 is filled with melt, no air will be mixed in. In this way, when the pre-changing screen plate 11 replaces the working screen plate 12, no air will be mixed in with the pre-changing screen plate 11 and the melt. The impact on the material supply at the mold end after screen replacement is minimal, which will not cause product defects and ensure continuous production and product qualification rate.

[0022] In a preferred embodiment, the upper part of the housing 1 is threadedly connected to a screen-changing screw 3 for opening or blocking the diversion channel 102. The screen-changing screw 3 includes a threaded portion 301 threadedly connected to the housing 1 and a blocking end 302 extending into the diversion channel 102. When the screen plate does not need to be replaced, the blocking end 302 extends into the diversion channel 102 to block it; when the screen plate needs to be replaced, the screen-changing screw 2 is turned, and the threaded portion 301 drives the blocking end 302 to move upward, so that the diversion channel 102 is connected to the pre-flow channel 103, allowing the melt to flow into the pre-replacement screen plate 11.

[0023] In a preferred embodiment, a plurality of support rods 5 are fixedly provided on the upper end of the housing 1. In this embodiment, there are four support rods 5. The upper end of the support rods 5 is connected to a fixing plate 6. The upper part of the fixing plate 6 is connected to a hydraulic cylinder 7. The output end of the hydraulic cylinder 7 passes through the fixing plate 6 and is connected to a lower pressure plate 8. The lower pressure plate 8 is used to press the spare mesh plate 10 against the wall. When the screen plate is not replaced, the screen replacement channel 101 is arranged from top to bottom as a pre-replacement screen plate 11, a working screen plate 12, and a discarded screen plate 13. At this time, the spare screen plate 10 is located above the pre-replacement screen plate 11. When replacing the screen, the blocking plate 14 is opened, and the hydraulic cylinder 7 and the lower pressure plate 8 push the spare screen plate 10 downward. The spare screen plate 10 becomes the new pre-replacement screen plate 11. The original pre-replacement screen plate 11 moves to the position of the working screen plate 12, and the original working screen plate 12 moves to the position of the discarded screen plate 13. The original discarded screen plate 13 is pushed out. Then the blocking plate 14 is closed, and a new spare screen plate 10 is added to the original spare screen plate 10. Thus, the screen replacement operation is completed.

[0024] like Figure 2As shown, in a preferred embodiment, a feeder component 9 for conveying spare mesh plates 10 is connected to one side of the housing 1. The feeder component 9 is used for automatic feeding of spare mesh plates 10. After mesh replacement, the spare mesh plate 10 located on the upper part of the feeder component 9 is directly pushed to the lower pressure plate 8. Specifically, the feeder component 9 includes a frame 901 connected to the housing 1. Multiple spare mesh plates 10 slide horizontally within the frame 901. A cylinder 902 is provided on one side of the frame 901. The output end of the cylinder 902 passes through the side wall of the frame 901 and is connected to a push plate 903. The push plate 903 is used to push the spare mesh plate 10 to move under the lower pressure plate 8 to replace the original spare mesh plate 10. To prevent the spare mesh plate 10 to be replaced from being accidentally moved during the up and down movement of the lower pressure plate 8, a limiting top plate 904 is provided on the upper part of the frame 901 near the output end of the hydraulic cylinder 7 to prevent the spare mesh plate 10 near the lower pressure plate 8 from being accidentally moved.

[0025] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A non-stop hydraulic screen changer device, comprising a housing (1) with a feeding channel (2), wherein the housing (1) is longitudinally provided with a screen changing channel (101), characterized in that: The screen changing channel (101) is provided with a pre-screen changing plate (11), a working screen plate (12) and a waste screen plate (13) from top to bottom. The waste screen plate (13) is provided with a blocking plate (14) at the bottom. The pre-screen changing plate (11) is abutted against a spare screen plate (10) driven by a hydraulic cylinder (7) located above the housing (1). The feed channel (2) is provided with a diversion channel (102) at the top. The diversion channel (102) extends towards the pre-screen changing plate (11) with a pre-flow channel (103). The pre-flow channel (103) passes through the pre-screen changing plate (11) and extends to an overflow channel (104) with a plug (4) on the outside. The upper part of the housing (1) is threaded with a screen changing screw (3) to open or block the diversion channel (102).

2. The non-stop hydraulic screen changer device according to claim 1, characterized in that: The screen-changing screw (3) includes a threaded part (301) that is threaded to the housing (1) and a blocking end (302) that extends into the diversion channel (102).

3. The non-stop hydraulic screen changer device according to claim 1, characterized in that: The upper end of the housing (1) is fixedly provided with several support rods (5), the upper end of the support rods (5) is connected to a fixing plate (6), the upper part of the fixing plate (6) is connected to the hydraulic cylinder (7), and the output end of the hydraulic cylinder (7) passes through the fixing plate (6) and is connected to a lower pressure plate (8) that presses the spare mesh plate (10) against it.

4. The non-stop hydraulic screen changer device according to claim 1, characterized in that: The housing (1) is connected to a wire feeder (9) for conveying the spare wire mesh plate (10) on one side.

5. The non-stop hydraulic screen changer device according to claim 4, characterized in that: The net feeding component (9) includes a frame (901) connected to the housing (1) and a cylinder (902) located on one side of the frame (901). The output end of the cylinder (902) passes through the side wall of the frame (901) and is connected to a push plate (903) for pushing the spare net plate (10).

6. The non-stop hydraulic screen changer device according to claim 5, characterized in that: The frame (901) is provided with a limiting top plate (904) on the upper part near the output end of the hydraulic cylinder (7).

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