Halogen-free engineering plastic carbon black efficient mixing device

Abstract

The utility model relates to high polymer material processing equipment technical field, concretely relates to a kind of efficient mixing device of halogen-free engineering plastics carbon black, including double-screw extruder main body and the die head of being installed in the output end of double-screw extruder main body, channel is opened in die head and is communicated with the extrusion cavity of double-screw extruder main body, the top and bottom of die head are all penetrated channel and are equipped with jack, two jacks are jointly inserted with the mounting plate that can slide up and down, several square holes that are equally spaced distribution are penetrated and equipped on the mounting plate, several square holes are all detachably installed with filter screen, several filter screens are all vertical and filled with entire flow channel, by lifting electric cylinder drive mounting plate up and down sliding, different filter screen can be switched in non-stop state, avoid the cumbersome operation of traditional screen change and need to stop die head disassembly, improve production efficiency, multiple square filter screens are vertically arranged, increase filtration area, extend jamming time, suitable for high-filled carbon black formula.

Description

Technical Field

[0001] This utility model relates to the field of polymer material processing equipment technology, specifically to a high-efficiency mixing device for halogen-free engineering plastic carbon black. Background Technology

[0002] Halogen-free engineering plastics (such as PA, PC, PBT, etc.) are widely used in electronics, automotive parts, and other fields due to their excellent flame retardancy, electrical properties, and environmental friendliness. Carbon black, as a commonly used conductive or reinforcing filler, is prone to agglomeration during the mixing process due to uneven dispersion, which affects the material properties.

[0003] Traditional twin-screw extruders typically employ a fixed filter screen structure when compounding engineering plastics with high carbon black content, which presents the following problems:

[0004] The filter screen clogs quickly: Carbon black particles tend to accumulate at the filter screen, leading to increased melt pressure and requiring frequent shutdowns to replace the filter screen, which affects production efficiency.

[0005] Replacement is cumbersome: Traditional filter screens require disassembling the mold head or using a sliding screen changer, which is complicated and the high-temperature melt is prone to leakage, posing a safety hazard.

[0006] Inconvenient to clean: After the filter screen is removed, residual carbon black needs to be cleaned manually, which is time-consuming and difficult to clean thoroughly, affecting the subsequent use effect.

[0007] To address the aforementioned issues, there is an urgent need for a high-efficiency mixing device that can quickly switch filters, is easy to disassemble and clean, and is adaptable to the mixing of highly filled carbon black. Utility Model Content

[0008] The purpose of this invention is to provide a high-efficiency mixing device for halogen-free engineering plastic carbon black. Through the design of a sliding mounting plate and modular filter screen, the device enables rapid filter screen switching without stopping the machine, while also facilitating disassembly and cleaning, thereby improving production efficiency and product quality.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] This utility model provides a high-efficiency mixing device for halogen-free engineering plastic carbon black, including a twin-screw extruder body and a die head installed at the output end of the twin-screw extruder body. The die head has a channel communicating with the extrusion chamber of the twin-screw extruder body. The top and bottom of the die head both have insertion holes through the channel. A mounting plate that can slide up and down is inserted into the two insertion holes. The mounting plate has several square holes that are evenly spaced vertically. Filter screens are detachably installed in the square holes. The filter screens vertically fill the entire flow channel.

[0011] Furthermore, limit slots are provided on both opposite inner sidewalls of the channel, and slide bars are fixedly installed on both opposite outer sides of the mounting plate. The two slide bars are respectively slidably engaged in the corresponding limit slots.

[0012] Furthermore, a lifting electric cylinder is installed at the bottom of the main body of the twin-screw extruder, and a lifting rod is fixedly installed between the output end of the lifting electric cylinder and the bottom of the mounting plate.

[0013] Furthermore, grip grooves are provided on the two opposite inner walls of several of the square holes.

[0014] Furthermore, each of the two opposite outer walls of the filter screens is fixedly fitted with a handle, and the handles are magnetically attached to their respective grip grooves and are flush with the surface of the filter screen.

[0015] Furthermore, a stop bar is fixedly installed at the bottom of the mounting plate, and the top of the lifting rod is vertically fixedly connected to the bottom of the stop bar. The two ends of the stop bar are flush with the two outer side walls of the mold head, respectively.

[0016] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0017] Quickly switch filters to reduce downtime.

[0018] The mounting plate can be moved up and down by a lifting electric cylinder, allowing for the switching of different filter screens without stopping the machine. This avoids the cumbersome operation of disassembling the die head when changing screens, which requires stopping the machine in the traditional way, thus improving production efficiency. Multiple square filter screens are arranged vertically to increase the filtration area and extend the clogging time, making it suitable for high-filling carbon black formulations.

[0019] Modular design for easy cleaning and replacement

[0020] The filter screen features a detachable structure and can be easily removed using the handle without the need for special tools, reducing maintenance difficulty. The magnetic adsorption design ensures a secure installation of the filter screen while preventing it from falling off due to the impact of high-temperature molten metal.

[0021] Good sealing performance to prevent molten material leakage

[0022] The mounting plate and the die head are fitted with a sliding strip and a limiting groove to ensure smooth sliding and reliable sealing, preventing melt leakage. The baffle design further prevents melt from leaking from the bottom of the mounting plate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall first-view structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the overall second-view structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the mounting plate and filter screen installation structure of this utility model;

[0027] Figure 4 This is a schematic diagram showing the disassembled structure of the mounting plate and filter screen of this utility model.

[0028] The labels in the diagram represent:

[0029] 1. Twin-screw extruder body; 11. Die head;

[0030] 2. Lifting electric cylinder; 21. Lifting rod;

[0031] 3. Mounting plate; 31. Sliding bar; 32. Square hole; 33. Grip groove;

[0032] 4. Filter screen; 41. Handle. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] Example 1

[0036] Reference Figure 1-4This first embodiment of the present invention discloses a high-efficiency mixing device for halogen-free engineering plastic carbon black, comprising a twin-screw extruder body 1 and a die 11 installed at the output end of the twin-screw extruder body 1. The twin-screw extruder body 1 consists of a drive motor, a gearbox, a barrel, meshing twin screws, a heating and cooling system, and a control system. The barrel adopts a segmented structure and is lined with wear-resistant alloy steel. The twin screws are designed as modular units and are made of nitrided steel with a nitrided surface. The die 11 is bolted to the end of the barrel via a flange, and a high-temperature graphite sealing gasket is provided on the connection surface. A channel communicating with the extrusion chamber of the twin-screw extruder body 1 is opened inside the die 11. Insertion holes are opened through the channel at the top and bottom of the die 11. A mounting plate 3 that can slide up and down is inserted into both insertion holes. The mounting plate 3 is made of high-temperature tool steel H13 and has undergone quenching treatment. The mounting plate 3 has several square holes 32 evenly spaced vertically. Each of the square holes 32 contains a detachable filter screen 4. The filter screen 4 has a multi-layer sintered metal fiber felt structure and the base material is 316L stainless steel. The filter screens 4 vertically fill the entire flow channel.

[0037] Example 2

[0038] Reference Figure 1-4 This is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: limit slots are provided on both opposite inner sidewalls of the channel, and the surfaces of the limit slots are plated with hard chrome. Slide bars 31 are fixedly installed on both opposite outer sides of the mounting plate 3. The slide bars 31 are made of copper-based graphite self-lubricating material. The two slide bars 31 are respectively slidably engaged in the corresponding limit slots. A lifting electric cylinder 2 is installed at the bottom of the twin-screw extruder body 1. The lifting electric cylinder 2 is connected to an external PLC controller. A lifting rod 21 is fixedly installed between the output end of the lifting electric cylinder 2 and the bottom of the mounting plate 3. The lifting rod 21 is a solid 45# steel rod with a chrome-plated surface.

[0039] Each of the several square holes 32 has a handle groove 33 on each of its two opposite inner walls, and each of the several filter screens 4 has a handle 41 fixedly installed on each of its two opposite outer walls. The handle 41 is made of neodymium iron boron permanent magnet embedded in a 304 stainless steel shell. The handles 41 are magnetically attracted to their corresponding handle grooves 33 and are flush with the surface of the filter screen 4. A baffle bar made of hard aluminum alloy is fixedly installed at the bottom of the mounting plate 3. The top of the lifting rod 21 is vertically fixedly connected to the bottom of the baffle bar, and the two ends of the baffle bar are flush with the two outer walls of the mold head 11.

[0040] Working principle: The main body 1 of the twin-screw extruder is driven by a motor to rotate the two meshing screws in opposite directions. The material undergoes processes such as conveying, compression, melting, and mixing in the barrel. The die head 11 is connected by a flange for quick disassembly and assembly. Its internal channel adopts a streamlined design to reduce flow resistance. The filter screen 4 can be quickly replaced by a magnetic handle 41. The lifting mechanism of the mounting plate 3 adopts a servo-controlled lifting cylinder 2 for precise positioning. The slide bar 31 cooperates with the limit slot to ensure motion accuracy.

[0041] The remaining structure is the same as that in Example 1.

[0042] Work process:

[0043] Initial working state

[0044] The lifting cylinder 2 is in the retracted state, and the mounting plate 3 is located at the lower part of the mold head 11.

[0045] At this time, the uppermost filter screen 4 is directly opposite the center of the flow channel of the die head 11. The molten plastic flows through the filter screen 4 under the push of the twin-screw extruder body 1, completing the first filtration.

[0046] The remaining spare filters 4 are all located outside the mold head 11 and are in standby mode.

[0047] Filter 4 switching process

[0048] When the melt pressure rises due to carbon black accumulation in the working filter 4, the control system automatically triggers the switching program.

[0049] The lifting cylinder 2 pushes the mounting plate 3 upward through the lifting rod 21, and the slide bar 31 slides smoothly along the limit groove.

[0050] During the movement:

[0051] The current working filter 4 has been removed from the flow channel area;

[0052] The next adjacent filter 4 is precisely pushed into the center of the flow channel;

[0053] The entire switching process is completed within 2-3 seconds, during which the melt flow remains continuous and no shutdown is required.

[0054] Filter screen 4: Cleaning and replacement

[0055] The replaced filter screen 4 moves with the mounting plate 3 to the external operable area of ​​the mold head 11.

[0056] The operator removes the filter screen 4 from the square hole 32 using the handle 41.

[0057] The magnetic connection between the handle 41 and the grip groove 33 is overcome manually;

[0058] The filter screen 4 can be easily removed along the vertical direction of the square hole 32;

[0059] Clean the removed filter screen 4:

[0060] Carbon black residue is removed by soaking in a special solvent;

[0061] Alternatively, use ultrasonic cleaning equipment for deep cleaning;

[0062] After cleaning, the filter screen 4 is reinstalled into any square hole 32.

[0063] Align the handle 41 with the grip groove 33;

[0064] It automatically fixes itself in place by relying on magnetic adsorption;

[0065] The surface of the filter screen 4 should be flush with the mounting plate 3;

[0066] Continuous work guarantee

[0067] When all filters 4 need cleaning:

[0068] The pre-prepared spare mounting plate assembly can be quickly replaced;

[0069] To achieve completely non-stop operation of the production line;

[0070] The baffle structure ensures:

[0071] Stability of mounting plate 3 during movement;

[0072] Prevent the melt from leaking from the bottom;

[0073] Security protection mechanism

[0074] The temperature monitoring system monitors the temperature of each area of ​​the mold head 11 in real time;

[0075] Pressure sensors detect changes in flow channel pressure;

[0076] When an anomaly occurs

[0077] Automatically stop the lifting electric cylinder 2 from operating;

[0078] An alarm will be issued to prompt the operator to check;

[0079] Adaptable to different process requirements;

[0080] This can be achieved by replacing the filter screen with one of different mesh sizes.

[0081] The coarse filtration uses a 20-40 mesh filter.

[0082] Fine filtration uses a 60-100 mesh filter.

[0083] Mounting plate 3 can be configured with different numbers of filters 4:

[0084] The standard configuration includes 3-5 filtration stations;

[0085] It can be expanded to 8 workstations depending on production needs.

[0086] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-efficiency mixing apparatus for halogen-free engineering plastic carbon black, comprising a twin-screw extruder body (1) and a die (11) installed at the output end of the twin-screw extruder body (1), wherein the die (11) has a channel communicating with the extrusion chamber of the twin-screw extruder body (1), characterized in that, The top and bottom of the mold head (11) are provided with insertion holes through the channel. A mounting plate (3) that can slide up and down is inserted into both insertion holes. A number of square holes (32) with equal vertical spacing are provided through the mounting plate (3). A filter screen (4) can be detachably installed in each of the square holes (32). The filter screens (4) vertically fill the entire flow channel.

2. The high-efficiency mixing apparatus for halogen-free engineering plastic carbon black according to claim 1, characterized in that, Limiting slots are provided on both opposite inner walls of the channel, and slide bars (31) are fixedly installed on both opposite outer sides of the mounting plate (3). The two slide bars (31) are respectively slidably engaged in the corresponding limiting slots.

3. The high-efficiency mixing apparatus for halogen-free engineering plastic carbon black according to claim 1, characterized in that, A lifting cylinder (2) is installed at the bottom of the main body (1) of the twin screw extruder, and a lifting rod (21) is fixedly installed between the output end of the lifting cylinder (2) and the bottom of the mounting plate (3).

4. The high-efficiency mixing apparatus for halogen-free engineering plastic carbon black according to claim 1, characterized in that, Each of the square holes (32) has a grip groove (33) on its two opposite inner walls.

5. The high-efficiency mixing apparatus for halogen-free engineering plastic carbon black according to claim 4, characterized in that, Each of the filter screens (4) has a handle (41) fixedly installed on its two opposite outer sidewalls. Each of the handles (41) is magnetically adsorbed in its corresponding grip groove (33) and is flush with the surface of the filter screen (4).

6. The high-efficiency mixing apparatus for halogen-free engineering plastic carbon black according to claim 3, characterized in that, The bottom of the mounting plate (3) is fixedly installed with a baffle, and the top of the lifting rod (21) is vertically fixedly connected to the bottom of the baffle. The two ends of the baffle are flush with the two outer walls of the mold head (11).

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