Flattening Device and Method for Extruder Filter Screen

Abstract

The present invention discloses a flattening device and a flattening method for an extruder filter screen, belonging to the field of automation technology. It includes a conveying structure, a vision detection structure, a flattening structure and a manipulator; the flattening structure includes a frame, a rotating table, an umbrella-shaped flattening mechanism and a lifting drive mechanism; the umbrella-shaped flattening mechanism includes a pressing rod that can elastically contract upward and at least three flattening arms distributed in a rib-like shape thereon. A flattening wheel is provided at the lower end of the flattening arm and a tension spring is provided between it and the pressing rod. The pressing rod, the flattening arm and the tension spring form an umbrella-shaped structure; before flattening, under the action of the tension spring, the flattening arms are retracted; during flattening, the manipulator places the filter screen on the rotating table and makes the flat area on the filter screen located directly below the pressing rod; the umbrella-shaped flattening mechanism moves downward, the lower end of the pressing rod first presses on the filter screen, and then multiple flattening arms are synchronously unfolded, and the flattening wheels press on the filter screen and move outward; the umbrella-shaped flattening mechanism reciprocates up and down one or more times for flattening. When reciprocating multiple times, the rotating table rotates.

Description

Technical Field

[0001] The present invention belongs to the field of automation technology, and particularly relates to a flattening device and method for an extruder filter screen. Background Art

[0002] In the plastic product extrusion processing industry, due to the requirements for product quality, during the extrusion processing, it is often necessary to use a filter screen to filter the molten plastic in the extruder barrel. And in the plastic recycling process, using a filter screen to filter the plastic melt is an important means to improve the performance of recycled plastics. Since the recycled plastic raw materials often carry a large amount of impurities such as metals, sediment, and high-melting-point plastics, usually, a filtering system is installed between the tail of the extrusion screw and the extrusion die head of the recycled plastic extruder.

[0003] Chinese Patent CN1772461A discloses a melt rotary quick filter for an extruder, which is composed of a die body, a filter screen plate, and a hydraulic component. The die body is split, including a feed die body and a discharge die body, which are fixedly connected by screws. The filter screen plate is a ratchet-type filter screen plate, fixed between the feed die body and the discharge die body by a rotating shaft, and is provided with a plurality of filter holes thereon, and filter meshes are arranged in the holes; the hydraulic component is pivotally connected to the oil cylinder fixed seat, and includes two parts, a hydraulic cylinder and a hook, wherein the hook is arranged on the piston rod, and a roller device engaged with the ratchet teeth of the ratchet-type filter screen plate is arranged at its front end. This invention can realize hydraulic quick screen changing without stopping the machine, and the replaced screen can be recycled by incineration.

[0004] After the filter screen has been in the extruder for a period of time, it will be wrapped with thick plastic. Currently, generally, the plastic on the recycled filter screen is removed by incineration. However, after the filter screen is burned, it will be bent. Before reusing the filter screen, it is necessary to flatten the filter screen. As Figure 1 shown in the figure is the filter screen after being burned by fire, and the edges of the filter screen are bent after being heated. In the prior art, it is usually processed by manual flattening or smoothing, etc., with low automation and time-consuming and laborious. Summary of the Invention

[0005] In order to solve the foregoing problems, embodiments of the present invention provide a flattening device and method for an extruder filter screen, which can automatically flatten the filter screen, saving time and effort, and with a very fast processing speed. The technical solutions are as follows:

[0006] On the one hand, an embodiment of the present invention provides a flattening device for an extruder filter, the device comprising a conveying structure 1, a visual detection structure 2 above the end of the conveying structure 1, a flattening structure 3 next to the conveying structure 1, and a manipulator 4 between the conveying structure 1 and the flattening structure 3, the visual detection structure 2 can obtain the bending condition of the filter 5 and judge the flat area on the filter 5, the manipulator 4 can pick up the flat area of ​​the filter 5 and transfer the filter 5 from the conveying structure 1 to the rotating table 32 of the flattening structure 3; the flattening structure 3 comprises a frame 31, a rotating table 32, an umbrella-shaped flattening mechanism 33 and a lifting drive mechanism 34, the rotating table 32 and the lifting drive mechanism 34 are respectively arranged at the lower part and the upper part of the frame 31, the umbrella-shaped flattening mechanism 33 is located directly above the rotating table 32 and can be driven up and down by the lifting drive mechanism 34; the umbrella-shaped flattening mechanism 33 includes A pressure rod that can elastically contract upward and at least three flattening arms 8 distributed in an umbrella-like shape on it, a flattening wheel 10 is provided at the lower end of the flattening arm 8 and a tension spring 9 is provided between it and the pressure rod, the pressure rod, the flattening arm 8 and the tension spring 9 constitute an umbrella-shaped structure; before flattening, the flattening arm 8 is folded under the action of the tension spring 9; during flattening, the manipulator 4 places the filter 5 on the rotating table 32 and allows the flattened area on the filter 5 to be located directly below the pressure rod; the umbrella-shaped flattening mechanism 33 moves downward, the lower end of the pressure rod first presses on the filter 5 to fix the filter 5, and then multiple flattening arms 8 are synchronously unfolded, the flattening wheel 10 presses on the filter 5 and moves outward; the umbrella-shaped flattening mechanism 33 reciprocates up and down once or multiple times for flattening according to the detection results of the visual detection structure 2, and during multiple reciprocating movements, the rotating table 32 rotates according to the detection results of the visual detection structure 2.

[0007] The compression rod in the embodiment of the present invention includes a telescopic sleeve 6, a telescopic rod 7 extending downward from the lower part of the telescopic sleeve 6, and a spring between the telescopic sleeve 6 and the telescopic rod 7. The telescopic sleeve 6 and the telescopic rod 7 are both arranged vertically. The top of the telescopic sleeve 6 is connected to the lifting drive mechanism 34. The telescopic rod 7 can move up and down in the telescopic sleeve 6. The upper end of the flattening arm 8 is rotatably arranged on the upper part of the telescopic sleeve 6. The tension spring 9 is arranged between the flattening arm 8 and the telescopic sleeve 6, and its upper end is connected to the middle part of the flattening arm 8. Its lower end is connected to the lower part of the telescopic sleeve 6; the spring provides elastic force for the telescopic rod 7 to move downward; when the umbrella-shaped flattening mechanism 33 is folded, the tension spring 9 contracts, and multiple flattening arms 8 are tightly embraced outside the telescopic sleeve 6, and the flattening arms 8 are arranged obliquely outward from top to bottom, and the telescopic rod 7 is extended and its lower end is located below the flattening wheel 10; when the umbrella-shaped flattening mechanism 33 is unfolded, the tension spring 9 is extended, the lower end of the telescopic rod 7 presses on the filter screen 5 and moves upward, and the flattening arms 8 rotate outward.

[0008] Specifically, the telescopic rod 7 in the embodiment of the present invention is a round rod and a pressure head 11 is coaxially provided at the lower end thereof, and the telescopic sleeve 6 is a cylinder that is clearance-matched with the telescopic rod 7 .

[0009] Specifically, the lifting drive mechanism 34 in the embodiment of the present invention is a hydraulic cylinder; the hydraulic cylinder is vertically arranged on the frame 31, which is coaxially arranged with the telescopic sleeve 6, and the lower end of the telescopic rod is fixedly connected to the top of the telescopic sleeve 6.

[0010] Specifically, the number of the flattening arms 8 in the embodiment of the present invention is four, and the four flattening arms 8 are evenly distributed around the telescopic sleeve 6 .

[0011] Furthermore, a wheel frame 12 is provided at the lower end of the flattening arm 8 in the embodiment of the present invention, and the flattening wheel 10 is rotatably disposed on the wheel frame 12 and is perpendicular to the flattening arm 8 .

[0012] Preferably, a spreading plate 13 is provided on the lower outer side of the flattening arm 8 in the embodiment of the present invention; the upper part of the spreading plate 13 is fixed on the outer side of the flattening arm 8, and its lower end is located adjacent to the upper part of the bottom of the flattening wheel 10 and is tilted outward relative to the flattening arm 8.

[0013] Among them, the rotating table 32 in the embodiment of the present invention includes a lower support plate 21 fixed at the lower part of the frame 31, an upper support plate 22 on the upper side of the lower support plate 21, a servo motor 23 on the lower side of the lower support plate 21 and a driving shaft 24 at the center of the lower side of the upper support plate 22 and passing downward through the lower support plate 21; the driving shaft 24 is rotatably connected to the lower support plate 21, is coaxially arranged with the upper support plate 22, and is transmission-connected to the servo motor 23; the upper support plate 22 and the lower support plate 21 are both discs coaxially arranged with the pressure rod and a plurality of balls 25 are arranged therebetween, the upper support plate 22 is an electromagnetic magnetic disc, and the upper side of the lower support plate 21 and the lower side of the upper support plate 22 are both provided with annular grooves 26 for mounting the balls 25, the annular grooves 26 are coaxially arranged with the driving shaft 24, and the balls 25 are arranged in the annular grooves 26.

[0014] On the other hand, an embodiment of the present invention further provides a flattening method, using the flattening device of the extruder filter screen, the method comprising the following steps:

[0015] S101: Manually place the filter screens 5 into the conveying structure 1 one by one.

[0016] S102: The conveying structure 1 conveys the filter 5 to the bottom of the visual detection structure 2. When the visual detection structure 2 detects the filter 5 below, the conveying structure 1 stops.

[0017] S103: the visual detection structure 2 obtains the edge contour and the bending shape of the filter 5, determines the flat area on the filter 5, calculates the center coordinates of the flat area, and sends the calculated center coordinates to the manipulator 4 as the picking coordinates of the manipulator 4.

[0018] S104: The manipulator 4 picks up the filter screen 5 according to the picking coordinates and transfers the filter screen 5 from the conveying structure 1 to the rotary table 32. At this time, the upper support plate 22 is electrified, and the filter screen 5 is magnetically attracted to the upper support plate 22, and its flat area is located directly below the telescopic rod 7.

[0019] S105: The lifting drive mechanism 34 drives the umbrella-shaped flattening mechanism 33 to move downward. The lower end of the telescopic rod 7 first presses against the filter screen 5 and moves upward to fix the filter screen 5, and then the flattening wheel 10 presses against the filter screen 5 and moves outward to flatten the filter screen 5. At this time, multiple flattening arms 8 are deployed synchronously; according to the detection result of the visual detection structure 2, the lifting drive mechanism 34 moves up and down one or more times for flattening; when flattening multiple times, when the umbrella-shaped flattening mechanism 33 leaves the filter screen 5, the rotary table 32 rotates according to the detection result of the visual detection structure 2.

[0020] S106: After flattening is completed, the lifting drive mechanism 34 rises to the high position, and the manipulator 4 picks up the filter screen 5 and transfers the filter screen 5 outward.

[0021] In step S104, the telescopic rod 7 is located above the fixed position of the filter screen 5; the fixed position is obtained according to the detection result of the visual detection structure 2, and at least the following three conditions should be satisfied simultaneously: (1) located within the flat area of the filter screen 5, (2) close to the geometric center of the filter screen 5, and (3) far from the large-angle bending area of the filter screen 5; in step S101, if it is found that the filter screen 5 has a large-angle bending area, the operator manually smooths the large-angle bending area; among them, the large-angle bending area is an area with a bending angle greater than 120°.

[0022] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows: The embodiment of the present invention provides a flattening device and a flattening method for an extruder filter screen. Only feeding requires manual participation, and the judgment of bending conditions, flattening, and discharging are all realized automatically. The flattening of the filter screen can be realized automatically, which saves time and effort and has a very fast processing speed. In addition, a spreading plate is provided to handle filter screens with relatively large bending angles. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the filter screen after fire treatment;

[0024] Figure 2 is a schematic structural diagram of the flattening device for the extruder filter screen provided by the embodiment of the present invention;

[0025] Figure 3 is a top view of the flattening device for the extruder filter screen;

[0026] Figure 4 is a schematic structural diagram of the combination of the umbrella-shaped flattening mechanism and the lifting drive mechanism;

[0027] Figure 5It is a schematic structural view when the umbrella-shaped flattening mechanism is retracted;

[0028] Figure 6 It is a schematic structural view when the umbrella-shaped flattening mechanism is deployed;

[0029] Figure 7 It is a schematic structural view of the flattening arm;

[0030] Figure 8 It is a side view of the flattening arm;

[0031] Figure 9 It is a cross-sectional view of the rotating table;

[0032] Figure 10 It is a schematic structural view of the combination of the lower support plate and the upper support plate.

[0033] In the figure: 1 conveying structure, 2 vision detection structure, 3 flattening structure, 4 manipulator, 5 filter screen, 6 telescopic sleeve, 7 telescopic rod, 8 flattening arm, 9 tension spring, 10 flattening wheel, 11 pressing head, 12 wheel rack, 13 spreading plate;

[0034] 21 lower support plate, 22 upper support plate, 23 servo motor, 24 drive shaft, 25 ball, 26 annular groove;

[0035] 31 frame, 32 rotating table, 33 umbrella-shaped flattening mechanism, 34 lifting drive mechanism. Specific implementation mode

[0036] To make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1

[0038] See Figures 1-8 , Embodiment 1 provides a flattening device for an extruder filter screen. The device includes a conveying structure 1 arranged in the front-rear direction, a vision detection structure 2 above the rear end of the conveying structure 1, a flattening structure 3 on the left or right side of the conveying structure 1, and a manipulator 4 between the conveying structure 1 and the flattening structure 3 and behind the conveying structure 1, etc. The vision detection structure 2 can obtain the bending condition of the filter screen 5 and judge the flat area on the filter screen 5. The vision detection structure 2 can control the conveying structure 1, the manipulator 4 and the flattening structure 3. The manipulator 4 can pick up the flat area of the filter screen 5 and transfer the filter screen 5 from the conveying structure 1 to the rotating table 32 of the flattening structure 3; at the same time, the manipulator 4 is also used for discharging after flattening, such as transferring to a bin behind the conveying structure 1.

[0039] Among them, the flattening structure 3 includes a frame 31, a rotating table 32, an umbrella-shaped flattening mechanism 33, a lifting drive mechanism 34, etc. The frame 31 is of a frame structure. The rotating table 32 and the lifting drive mechanism 34 are respectively arranged at the lower and upper parts of the frame 31. The umbrella-shaped flattening mechanism 33 is located directly above the rotating table 32 and can be driven by the lifting drive mechanism 34 to move up and down. The rotating table 32 is driven to rotate by a corresponding structure.

[0040] Among them, the umbrella-shaped flattening mechanism 33 includes a pressing rod that can elastically contract upward and at least three flattening arms 8 distributed in an umbrella rib shape thereon. A flattening wheel 10 is provided at the lower end of the flattening arm 8, and a tension spring 9 is provided between it and the pressing rod. The pressing rod, the flattening arm 8 and the tension spring 9 form an umbrella-shaped structure. The flattening arm 9 corresponds to the umbrella rib of the umbrella-shaped structure, the tension spring 9 corresponds to the tension spring of the umbrella-shaped structure, and the pressing rod corresponds to the combination of the umbrella rod and the sliding sleeve of the umbrella-shaped structure. The umbrella-shaped structure can be unfolded and folded like an umbrella, and is used to flatten the filter screen 5 when unfolded.

[0041] Before flattening, under the action of the tension spring 9, the flattening arms 8 are folded up, and the umbrella-shaped flattening mechanism 33 is at a high position. During flattening, the manipulator 4 places the filter screen 5 on the rotating table 32 (the placement direction of the filter screen 5 can be realized according to a predetermined algorithm, and it is best to make one or more flattening arms 8 face the bent part of the filter screen 5), and makes the flat area on the filter screen 5 be directly below the pressing rod. The lifting drive mechanism 34 drives the umbrella-shaped flattening mechanism 33 to move downward. The lower end of the pressing rod first presses on the filter screen 5 to fix the filter screen 5, and then the multiple flattening arms 8 are unfolded synchronously. At this time, the flattening wheel 10 presses on the filter screen 5 and moves outward, and the flattening wheel 10 rolls on the bent part of the filter screen 5 to flatten it. The umbrella-shaped flattening mechanism 33 reciprocates up and down one or more times according to the detection result of the visual detection structure 2 (judged according to a set algorithm) for flattening. When reciprocating multiple times, the rotating table 32 rotates according to the detection result of the visual detection structure 2.

[0042] Among them, see Figures 4-8, the pressure rod in the embodiment of the present invention includes a telescopic sleeve 6, a telescopic rod 7 and a spring. The telescopic sleeve 6 and the telescopic rod 7 are both arranged vertically; the top of the telescopic sleeve 6 is connected to the lifting drive mechanism 34, on which a limit structure for limiting the upward and downward sliding position of the telescopic rod 7 is provided; the telescopic rod 7 is located in the lower part of the telescopic sleeve 6 and extends downward from the telescopic sleeve 6, and can move up and down in the telescopic sleeve 6, and is located directly above the center of the rotating table 32. The spring is arranged between the telescopic sleeve 6 and the telescopic rod 7, and provides elastic force for the telescopic rod 7 to move downward. Specifically, the spring is arranged vertically and is arranged in the telescopic sleeve 6. The upper end of the flattening arm 8 is rotatably arranged on the upper part of the telescopic sleeve 6 through a pin shaft (perpendicular to the radial direction of the telescopic sleeve 6). The tension spring 9 is arranged between the flattening arm 8 and the telescopic sleeve 6, and its upper end is connected to the middle part of the flattening arm 8, and its lower end is connected to the lower part of the telescopic sleeve 6. When the umbrella-shaped flattening mechanism 33 is folded, the tension spring 9 contracts, the tension spring 9 is arranged vertically, and the plurality of flattening arms 8 are tightly held outside the telescopic sleeve 6. The flattening arms 8 are arranged slightly obliquely outward from top to bottom to ensure that the flattening wheel 10 slides outward after contacting the filter screen, and the telescopic rod 7 is extended and its lower end is located below the flattening wheel 10. When the umbrella-shaped flattening mechanism 33 is unfolded, the tension spring 9 is extended, the tension spring 9 is arranged obliquely outward from top to bottom, and the tension spring 9, the flattening arm 8 and the telescopic sleeve 6 form a triangle; the lower end of the telescopic rod 7 presses on the filter screen 5 and moves upward (the spring provides downward elastic force), and the plurality of flattening arms 8 rotate outward synchronously. The range of outward movement of the lower end of the flattening arm 8 must ensure that it can move to the outside of the edge of the filter screen 5. Specifically, a spring hook pin is provided on the inner side of the middle and upper part of the flattening arm 8, and the upper end of the tension spring 9 is connected to the spring hook pin. When the umbrella-shaped flattening mechanism 33 is folded, the spring hook pin abuts against the telescopic sleeve 6 to make the flattening arm 8 slightly tilted outward from top to bottom. Specifically, the telescopic rod 7 is a round rod and a pressure head 11 (specifically a disc) is coaxially provided at its lower end to increase the contact area, thereby ensuring the fixing effect on the filter 5. The telescopic sleeve 6 is a cylinder that is clearance-matched with the telescopic rod 7.

[0043] Specifically, the lifting drive mechanism 34 in the embodiment of the present invention is a hydraulic cylinder. The hydraulic cylinder is vertically arranged on the frame 31, and is coaxially arranged with the telescopic sleeve 6, and the lower end of the telescopic rod is fixedly connected to the top of the telescopic sleeve 6.

[0044] Specifically, the number of the flattening arms 8 in the embodiment of the present invention is four, and the four flattening arms 8 are evenly distributed around the telescopic sleeve 6, and the angle between two adjacent flattening arms 8 is 90 degrees. Of course, the number of the flattening arms 8 can also be three or five.

[0045] Further, see Figures 4-8 In the embodiment of the present invention, a wheel frame 12 is provided at the lower end of the flattening arm 8, and the flattening wheel 10 is rotatably arranged on the wheel frame 12 and is perpendicular to the flattening arm 8. Specifically, the wheel frame 12 is an inverted U-shaped structure, which is arranged along the direction where the flattening arm 8 is located, and the lower ends of its two arms are arc-shaped. The flattening wheel 10 is located between the two arms of the wheel frame 12.

[0046] Preferably, a spreading plate 13 is provided on the outer side of the lower part of the flattening arm 8 in the embodiment of the present invention. The spreading plate 13 can flip the area with too large bending angle to a smaller angle (<90°) to prevent the bent part from being crushed by the flattening wheel 10 when the bending angle of the filter is too large (>120°). The upper part of the spreading plate 13 is fixed to the outer side of the flattening arm 8, and its lower end is located adjacent to the upper part of the bottom of the flattening wheel 10 (when the flattening arm 8 is folded) and it is tilted outward relative to the flattening arm 8. Specifically, the spreading plate 13 is a plastic hard plate, which is lower than the filter 5 (steel) in hardness and has a little toughness.

[0047] Among them, see Figure 9 and 10 , the rotating table 32 in the embodiment of the present invention includes a lower support plate 21, an upper support plate 22, a servo motor 23 and a drive shaft 24. The lower support plate 21 is fixed to the lower part of the frame 31. The upper support plate 22 is located adjacent to the upper part of the lower support plate 21 and a plurality of balls 25 are arranged between the upper support plate 22 and the lower support plate 21. The drive shaft 24 is coaxially arranged at the center of the lower side of the upper support plate 22, and passes through the drive shaft 24 of the lower support plate 21 downward. It is rotatably connected to the lower support plate 21 through a bearing, and is transmission-connected to the servo motor 23. The servo motor 23 is fixed to the lower side of the lower support plate 21. Both the upper support plate 22 and the lower support plate 21 are discs (larger than the filter 5) coaxially arranged with the pressure rod; the upper support plate 22 is an electromagnetic disk, and when there is a filter 5 on it, it is energized to further fix the filter 5. When the manipulator 4 takes away the filter 5, the electromagnetic disk is powered off. The upper side of the lower support plate 21 and the lower side of the upper support plate 22 are both provided with an annular groove 26 for mounting the ball 25; the annular groove 26 is coaxially arranged with the drive shaft 24, and is a semicircular groove matched with the ball 25; the upper part of the ball 25 rolls in the annular groove 26 of the upper support plate 22, and the lower part of the ball 25 rolls in the annular groove 26 of the lower support plate 21. Specifically, two annular grooves 26 are correspondingly arranged on the lower support plate 21 and the upper support plate 22, and the annular grooves 26 on the lower support plate 21 and the upper support plate 22 are arranged opposite to each other.

[0048] Furthermore, in the embodiment of the present invention, a visual camera may be arranged on the frame 31 and above the rotating table 32 to detect the flattening condition of the filter 5, so as to control the flattening times of the umbrella-shaped flattening mechanism 33 and the rotation angle of the rotating table 32, so as to achieve the flattening of the filter 5 with the least possible flattening times and ensure that the filter 5 can be flattened.

[0049] Example 2

[0050] Embodiment 2 provides a flattening method, using the flattening device for the extruder filter disclosed in Embodiment 1, comprising the following steps:

[0051] S101: An operator manually places the filter screens 5 into the conveying structure 1 one by one.

[0052] S102: The conveying structure 1 sends the filter screen 5 below the vision inspection structure 2. When the vision inspection structure 2 detects the filter screen 5 below, the conveying structure 1 stops.

[0053] S103: The vision inspection structure 2 obtains the edge contour and bending shape of the filter screen 5, determines the flat area on the filter screen 5, calculates the central coordinates of the flat area, and sends the calculated central coordinates to the manipulator 4 as the picking coordinates of the manipulator 4.

[0054] S104: The manipulator 4 picks up the filter screen 5 according to the picking coordinates and transfers the filter screen 5 from the conveying structure 1 to the rotary table 32. At this time, the upper support plate 22 is powered on, and the filter screen 5 is magnetically attracted to the upper support plate 22 to prevent slipping or being thrown off or displaced during rotation; at this time, the flat area of the filter screen 5 is directly below the telescopic rod 7. The vision inspection structure 2 will calculate the best position to fix the filter screen 5 according to the filter screen image data collected by the camera, avoiding the fixing position being too far from the center of the filter screen 5 (within the flat area), and also avoiding the umbrella-shaped flattening mechanism 33 directly pressing on the position with too large a bend. Then the manipulator 4 places the filter screen 5 at the corresponding position on the rotary table 32.

[0055] S105: The lifting drive mechanism 34 drives the umbrella-shaped flattening mechanism 33 to move downward. The lower end of the telescopic rod 7 first presses against the filter screen 5 and moves upward to fix the filter screen 5, and then the flattening wheel 10 presses against the filter screen 5 and moves outward to flatten the filter screen 5. At this time, multiple flattening arms 8 are deployed synchronously; according to the detection result of the vision inspection structure 2, the lifting drive mechanism 34 moves up and down once or multiple times for flattening; during multiple flattenings, when the umbrella-shaped flattening mechanism 33 leaves the filter screen 5, the rotary table 32 rotates according to the detection result of the vision inspection structure 2. Of course, this step can also control the number of flattening times and the rotation angle of the rotary table 32 according to the detection result of the vision camera on the frame 31.

[0056] S106: After flattening is completed (all bent parts are flattened), the lifting drive mechanism 34 rises to the high position, and the manipulator 4 picks up the filter screen 5 and transfers the filter screen 5 outward. At this time, the upper support plate 22 is powered off.

[0057] In step S104, the telescopic rod 7 is above the fixed position of the filter screen 5. The fixed position is obtained according to the detection result of the vision inspection structure 2, and at least the following three conditions should be met simultaneously: (1) within the flat area of the filter screen 5, (2) close to the geometric center of the filter screen 5, and (3) far from the large-angle bending area of the filter screen 5 to avoid the flattening mechanism directly pressing on the position with too large a bend. In step S101, if the operator finds that there is a large-angle bending area on the filter screen 5, the large-angle bending area is manually smoothed; among them, the large-angle bending area is the area where the bending angle is greater than 120°.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Flattening device for the extruder filter screen, characterized in that, It includes a conveying structure (1), a visual inspection structure (2) above the end of the conveying structure (1), a flattening structure (3) beside the conveying structure (1), and a manipulator (4) between the conveying structure (1) and the flattening structure (3). The visual inspection structure (2) can obtain the bending condition of the filter screen (5) and judge the flat area on the filter screen (5). The manipulator (4) can pick up the flat area of the filter screen (5) and transfer the filter screen (5) from the conveying structure (1) to the rotating table (32) of the flattening structure (3). The flattening structure (3) includes a frame (31), a rotating table (32), an umbrella-shaped flattening mechanism (33), and a lifting drive mechanism (34). The rotating table (32) and the lifting drive mechanism (34) are respectively arranged at the lower part and the upper part of the frame (31). The umbrella-shaped flattening mechanism (33) is located directly above the rotating table (32) and can be driven by the lifting drive mechanism (34) to move up and down. The umbrella-shaped flattening mechanism (33) includes a pressure rod that can elastically contract upward and at least three flattening arms (8) distributed in an umbrella rib shape on it. A flattening wheel (10) is provided at the lower end of the flattening arm (8), and a tension spring (9) is arranged between it and the pressure rod. The pressure rod, the flattening arm (8), and the tension spring (9) form an umbrella-shaped structure. Before flattening, under the action of the tension spring (9), the flattening arm (8) is retracted. When flattening, the manipulator (4) places the filter screen (5) on the rotating table (32) and makes the flat area on the filter screen (5) directly below the pressure rod. The umbrella-shaped flattening mechanism (33) moves downward. The lower end of the pressure rod first presses against the filter screen (5) to fix the filter screen (5), and then multiple flattening arms (8) are synchronously unfolded. The flattening wheel (10) presses against the filter screen (5) and moves outward. The umbrella-shaped flattening mechanism (33) reciprocates up and down one or more times according to the detection result of the visual inspection structure (2) for flattening. When reciprocating multiple times, the rotating table (32) rotates according to the detection result of the visual inspection structure (2). The pressure rod includes a telescopic sleeve (6), a telescopic rod (7) extending downward at the lower part inside the telescopic sleeve (6), and a spring between the telescopic sleeve (6) and the telescopic rod (7). A spreading plate (13) is provided on the outer side of the lower part of the flattening arm (8). The upper part of the spreading plate (13) is fixed on the outer side of the flattening arm (8), and its lower end is located adjacent to the upper part of the bottom of the flattening wheel (10) and is tilted outward relative to the flattening arm (8). The rotating platform (32) comprises a lower support plate (21) fixed at the lower part of the frame (31), an upper support plate (22) on the upper side of the lower support plate (21), a servo motor (23) on the lower side of the lower support plate (21), and a driving shaft (24) at the center of the lower side of the upper support plate (22) and passing through the lower support plate (21) downward; the driving shaft (24) is rotatably connected to the lower support plate (21), is coaxially arranged with the upper support plate (22), and is connected to the servo motor (23) ) transmission connection; the upper support plate (22) and the lower support plate (21) are both discs coaxially arranged with the pressure rod and a plurality of balls (25) are arranged between them, the upper support plate (22) is an electromagnetic disc, the upper side of the lower support plate (21) and the lower side of the upper support plate (22) are both provided with an annular groove (26) for mounting the balls (25), the annular groove (26) is coaxially arranged with the driving shaft (24), and the balls (25) are arranged in the annular groove (26); The telescopic rod (7) is located above the fixed position of the filter (5); the fixed position is obtained based on the detection result of the visual detection structure (2) and must simultaneously meet at least the following three conditions: (1) located within the flat area of ​​the filter (5), (2) close to the geometric center of the filter (5), and (3) away from the large-angle bending area of ​​the filter (5).

2. The flattening device for the extruder filter screen according to claim 1, characterized in that, The telescopic sleeve (6) and the telescopic rod (7) are both arranged vertically, the top of the telescopic sleeve (6) is connected to the lifting drive mechanism (34), the telescopic rod (7) can move up and down in the telescopic sleeve (6), and the upper end of the flattening arm (8) is rotatably arranged on the upper part of the telescopic sleeve (6); the tension spring (9) is arranged between the flattening arm (8) and the telescopic sleeve (6), the upper end of which is connected to the middle part of the flattening arm (8), and the lower end of which is connected to the lower part of the telescopic sleeve (6); the spring provides elastic force for the telescopic rod (7) to move downward; When the umbrella-shaped flattening mechanism (33) is folded, the tension spring (9) contracts, and the plurality of flattening arms (8) are tightly held outside the telescopic sleeve (6). The flattening arms (8) are arranged obliquely outward from top to bottom, and the telescopic rod (7) is extended and its lower end is located below the flattening wheel (10); when the umbrella-shaped flattening mechanism (33) is unfolded, the tension spring (9) is extended, the lower end of the telescopic rod (7) presses against the filter screen (5) and moves upward, and the flattening arms (8) rotate outward.

3. The flattening device for the extruder filter screen according to claim 1, characterized in that The telescopic rod (7) is a round rod and a pressure head (11) is coaxially arranged at the lower end thereof; the telescopic sleeve (6) is a cylinder which is clearance-matched with the telescopic rod (7).

4. The flattening device for the extruder filter screen according to claim 1, characterized in that, The lifting drive mechanism (34) is a hydraulic cylinder; the hydraulic cylinder is vertically arranged on the frame (31), and is coaxially arranged with the telescopic sleeve (6), and the lower end of the telescopic rod is fixedly connected to the top of the telescopic sleeve (6).

5. The flattening device for the extruder filter screen according to claim 1, characterized in that, The number of the flattening arms (8) is four, and the four flattening arms (8) are evenly distributed around the telescopic sleeve (6).

6. The flattening device for the extruder filter screen according to claim 1, characterized in that, A wheel frame (12) is provided at the lower end of the flattening arm (8), and the flattening wheel (10) is rotatably arranged on the wheel frame (12) and is perpendicular to the flattening arm (8).

7. A flattening method using the flattening device for an extruder filter screen according to any one of claims 1-6, characterized in that, The steps include: S101: manually placing the filter screens (5) one by one into the conveying structure (1); S102: The conveying structure (1) sends the filter screen (5) below the visual inspection structure (2). When the visual inspection structure (2) detects the filter screen (5) below, the conveying structure (1) stops. S103: The visual inspection structure (2) obtains the edge contour and bending shape of the filter screen (5), determines the flat area on the filter screen (5), calculates the central coordinates of the flat area, and sends the calculated central coordinates to the manipulator (4) as the picking coordinates of the manipulator (4). S104: The manipulator (4) picks up the filter screen (5) according to the picking coordinates and transfers the filter screen (5) from the conveying structure (1) to the rotating table (32). At this time, the upper support plate (22) is powered on, and the filter screen (5) is magnetically attracted to the upper support plate (22) and its flat area is located directly below the telescopic rod (7). S105: The lifting drive mechanism (34) drives the umbrella-shaped flattening mechanism (33) to move downward. The lower end of the telescopic rod (7) first presses against the filter screen (5) and moves upward to fix the filter screen (5), and then the flattening wheel (10) presses against the filter screen (5) and moves outward to flatten the filter screen (5). At this time, multiple flattening arms (8) are deployed synchronously; according to the detection result of the visual inspection structure (2), the lifting drive mechanism (34) moves up and down once or multiple times for flattening; during multiple flattenings, when the umbrella-shaped flattening mechanism (33) leaves the filter screen (5), the rotating table (32) rotates according to the detection result of the visual inspection structure (2). S106: After flattening is completed, the lifting drive mechanism (34) rises to the high position, and the manipulator (4) picks up the filter screen (5) and transfers the filter screen (5) outward. In step S104, the telescopic rod (7) is located above the fixed position of the filter screen (5); the fixed position is obtained according to the detection result of the visual inspection structure (2) and must simultaneously meet at least the following three conditions: (1) located within the flat area of the filter screen (5), (2) close to the geometric center of the filter screen (5), and (3) far from the large-angle bending area of the filter screen (5); in step S101, if a large-angle bending area is found on the filter screen (5), the large-angle bending area is manually smoothed; among them, the large-angle bending area is an area where the bending angle is greater than 120°.

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