A raw material mixing device for producing glass fiber filter paper

Abstract

This utility model discloses a raw material mixing device for producing glass fiber filter paper, belonging to the technical field of mixing devices. It includes a funnel-shaped mixing tank with a PTFE coating sprayed on the inner wall of its cavity. The top and bottom are flared outwards, and the waist is cylindrical. A support frame is fixedly connected to the bottom of the mixing tank. An inlet and an outlet are respectively located at the top and bottom of the mixing tank. Through a vibrating feeder inside the inlet combined with a fluororubber vibration damping pad, fiber bridging can be effectively eliminated, improving feeding stability by 90%. The dispersant is injected from the top, instantly wetting the fiber surface and improving dispersion efficiency by 40%. The binder is injected at the waist with temperature control, effectively maintaining a viscosity of 350±50 cP to ensure uniform coating. Finally, the additive is injected from the bottom with a pulse to prevent excessively high local concentrations.

Description

Technical Field

[0001] This utility model relates to the field of mixing devices, and more particularly to a raw material mixing device for producing glass fiber filter paper. Background Technology

[0002] In the production process of glass fiber filter paper, the uniformity of raw material mixing directly determines the product's filtration accuracy, mechanical strength, and batch stability. Traditional mixing devices generally suffer from three major technical bottlenecks:

[0003] Severe stratification and sedimentation: The density difference between glass fiber and binder leads to vertical stratification, and a concentration gradient often appears in the waist area; the inclined surface of the funnel-shaped container exacerbates radial stratification, forming a failure zone that is "sparse in the middle and dense at the edges" (the solid content at the edges can be up to 3 times that of the center).

[0004] High fiber damage rate: High-speed stirring impeller causes fiber breakage, with a measured damage rate of >3% (broken fibers reduce the uniformity of filter paper pores); the sharp edges of traditional impellers further exacerbate fiber cutting.

[0005] Uncontrolled adhesion and clumping: Adhesive deposits on the container wall, leaving residue with each batch, requiring frequent shutdowns for cleaning; fibers bridge at the feed inlet and entangle in the impeller, resulting in a high rate of downtime due to malfunctions.

[0006] However, existing solutions have the following limitations:

[0007] Conical single agitator: The bottom dead zone cannot be eliminated;

[0008] Ultrasonic dispersion: consumes too much energy and damages the fiber surface;

[0009] Mechanical scraping: Rigid scrapers wear down the cavity, and metal shavings contaminate the slurry. Utility Model Content

[0010] To address the shortcomings of existing technologies, this invention provides a raw material mixing device for producing glass fiber filter paper, which solves the problems mentioned in the background section.

[0011] To achieve the above objectives, this utility model is implemented through the following technical solution: a raw material mixing device for producing glass fiber filter paper, comprising a funnel-shaped mixing tank, the inner wall of which is sprayed with a PTFE coating, the top and bottom are outwardly flared, the waist is cylindrical, a support frame is fixedly connected to the bottom of the mixing tank, and the inlet and outlet are respectively located at the upper and lower ends of the mixing tank.

[0012] A three-layer mixing mechanism is installed at the top, middle, and bottom of the mixing tank;

[0013] A stratified feeding system is installed on the mixing tank;

[0014] The discharge port has a built-in knife gate valve.

[0015] As a further technical solution of this utility model, the three-layer stirring mechanism is as follows:

[0016] The top agitator is fixed to the top by a ring frame and a first mounting bracket, and its impeller is a 45° inclined blade turbine;

[0017] The waist-mounted agitator is fixed to the waist via a second horizontal mounting bracket. Its impeller is configured as a folding blade, and the main shaft is equipped with a PTFE scraper.

[0018] The bottom agitator is fixed to the bottom via a trapezoidal third mounting bracket, and its impeller is a three-bladed swept-back type.

[0019] As a further technical solution of this utility model, the layered feeding system includes:

[0020] The vibrating feeder built into the feed inlet is provided with a fluororubber vibration damping pad between it and the mixing tank.

[0021] The dispersant pipeline is connected to the auxiliary feed inlet at the top of the mixing tank;

[0022] The temperature-controlled jacketed adhesive pipeline is connected to the auxiliary feed inlet at the waist of the mixing tank;

[0023] The additive pipeline is independently installed at the bottom of the mixing tank.

[0024] As a further technical solution of this utility model, a triangular rib is provided at the root of the first mounting bracket, a radially distributed support claw is provided at three points on the second mounting bracket, the angle of the hypotenuse of the third mounting bracket is parallel to the conical wall, and a rubber and metal composite gasket is provided at the joint.

[0025] As a further technical solution of this utility model, the top agitator is driven by two independent motors, the impeller hub is equipped with a spiral scraper, and the motor shaft seal adopts a double-end mechanical seal.

[0026] As a further technical solution of this utility model, the waist agitator is belt driven and equipped with a torque limiter. The main shaft through-wall is sealed with silicon carbide / graphite seal, and the scraper shaft end is equipped with a lip seal and a PTFE dirt-blocking ring.

[0027] As a further technical solution of this utility model, the bottom agitator is directly connected to a hydraulic motor, and the hydraulic passage is sealed with a bellows and equipped with a leakage detection chamber.

[0028] As a further technical solution of this utility model, the PTFE coating thickness is ≥0.8mm, and the residue is scraped off when the gate valve is closed, thus achieving self-cleaning in conjunction with the PTFE coating.

[0029] This invention provides a raw material mixing device for producing glass fiber filter paper, which has the following advantages compared with the prior art:

[0030] 1. This design is a raw material mixing device for producing glass fiber filter paper. The mixing tank has a funnel-shaped structure with a PTFE coating to form a gradual flow field from top to bottom, which avoids fiber sedimentation and has a zero wall adhesion effect, reducing raw material loss.

[0031] 2. This design is a raw material mixing device for producing glass fiber filter paper. The vibrating feeder in the feed inlet, in conjunction with the fluororubber vibration isolation pad, can effectively eliminate fiber bridging. The dispersant is injected from the top, instantly wetting the fiber surface and improving the dispersion efficiency. The binder is injected at the waist with temperature control to effectively maintain viscosity and ensure uniform coating. Finally, the additive is injected at the bottom with pulse to prevent excessive local concentration.

[0032] 3. This design includes a raw material mixing device for producing glass fiber filter paper. The top agitator is a double-bladed turbine that generates an axial downward pressure flow, facilitating fiber compression and floating. A matching spiral scraper actively cuts entangled fibers, reducing overload failure rates. Furthermore, the mid-section agitator uses a folding blade and PTFE scraper to eliminate radial concentration gradients, resolving the issue of thinner flow in the middle and thicker flow at the edges. Finally, the bottom agitator is a three-bladed swept-back impeller with direct hydraulic connection, generating an upward thrust flow and completely eliminating dead zones at the bottom.

[0033] 4. The raw material mixing device for producing glass fiber filter paper designed in this paper has a first mounting frame with a triangular rib at its root position to improve its stability and eliminate the risk of breakage. The second mounting frame has a three-point radial support claw to effectively suppress the centrifugal deformation of the folding blade. The third mounting frame is a 60° trapezoid with rubber and metal composite pads to effectively dampen hydraulic vibration and extend bearing life. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a raw material mixing device for producing glass fiber filter paper.

[0035] Figure 2 This is a schematic diagram of a raw material mixing device for producing glass fiber filter paper.

[0036] Figure 3 This is a schematic diagram of a raw material mixing device for producing glass fiber filter paper.

[0037] In the diagram: 1. Mixing tank; 2. Inlet; 3. Support frame; 4. Outlet; 5. Top; 6. Waist; 7. Bottom; 8. Ring frame; 9. First mounting frame; 10. Top agitator; 11. Second mounting frame; 12. Waist agitator; 13. Third mounting frame; 14. Bottom agitator. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0039] Please see Figure 1-3 This utility model provides a technical solution for a raw material mixing device for producing glass fiber filter paper: it includes a mixing tank 1, a support frame 3 fixedly connected to the bottom of the mixing tank 1, an inlet 2 and an outlet 4 respectively provided at the upper and lower ends of the mixing tank 1, a top 5, a waist 6 and a bottom 7 arranged from top to bottom of the mixing tank 1, an annular frame 8 fixedly connected to the top of the top 5, a first mounting frame 9 and a top agitator 10 fixedly connected to the bottom surfaces of both sides of the annular frame 8, a second mounting frame 11 horizontally arranged fixedly connected to the inner wall of the waist 6, a waist agitator 12 arranged inside the second mounting frame 11, and a third mounting frame 13 arranged in a trapezoidal shape fixedly connected to the inner wall of the bottom 7, a bottom agitator 14 fixedly connected to the top of the third mounting frame 13.

[0040] like Figure 2-3 As shown, the mixing tank 1 is funnel-shaped with a PTFE coating on the inner wall. The top 5 and bottom 7 are both outwardly flared, while the waist 6 is cylindrical. The feed inlet 2 is located at the center of the top of the mixing tank 1. Two sets of auxiliary feed inlets are connected to both sides of the feed inlet 2. Each auxiliary feed inlet is equipped with a conveying pipeline. One set of auxiliary feed inlets is connected to the front of the top 5 through the conveying pipeline, and the other auxiliary feed inlet is connected to the front of the waist 6 through the conveying pipeline. The feed inlet 2 has a built-in vibrating feeder. A fluororubber vibration damping pad is installed between the feed inlet 2 and the mixing tank 1. A frequency-modulated vibration damper is installed on the base of the feeder. A separate set of conveying pipelines for conveying additives is installed on the lower surface of the bottom 7. The two sets of auxiliary feed inlets on both sides of the feed inlet 2 are respectively set as dispersant conveying pipelines and binder conveying pipelines.

[0041] A temperature control jacket is installed at the position where the adhesive delivery pipeline and the front of the waist 6 are connected. Two sets of the first mounting bracket 9 and the top agitator 10 are matched and arranged inwardly and oppositely. The top agitator 10 is a down-pressure agitator, and its impeller is a slanted blade turbine (45° inclination angle). In actual use, it generates an axial downward flow to force the fiber to be impregnated.

[0042] The first mounting bracket 9 has a triangular rib (thickness = 80% of the frame body) at the connection position. The second mounting bracket 11 is a horizontal support and is equipped with radial support claws evenly distributed at 3 points. The trapezoidal frame of the third mounting bracket 13 has a 60° hypotenuse angle (parallel to the cone wall). Rubber-metal composite gaskets are provided at the joint between the third mounting bracket 13 and the bottom agitator 14. The top agitator 10 is equipped with dual motors for independent drive, with frequency conversion speed regulation (150-250rpm). It is also equipped with overload automatic reverse (to prevent fiber entanglement). The impeller hub of the top agitator 10 is equipped with a spiral scraper with a pitch of 50mm and a cutting edge R angle of 0.2mm. Its motor shaft seal adopts a double-end mechanical seal and a flushing fluid interface. In actual use, the overload reverse logic is: current > 110% of the rated value → reverse for 2 seconds → forward rotation restart.

[0043] The waist agitator 12 is located at the junction of the funnel-shaped conical section and the straight section (the widest cross-section position). It is set as a folding blade paddle type (4-6 folds, 30°~45° inclination angle). In actual use, it breaks the radial aggregation of fibers, solves the uneven sedimentation caused by the inclined surface of the funnel-shaped mixing tank 1, enhances lateral diffusion, avoids the stratification of "thin in the middle and thick at the edge", and has the effect of low shear and high circulation flow rate, which is suitable for fiber damage prevention.

[0044] The waist agitator 12 is equipped with an external motor belt drive with a fixed speed ratio (0.6 × top speed) and a torque limiter (anti-stall). The main shaft of the waist agitator 12 is equipped with a polytetrafluoroethylene scraper, which rotates with the impeller with a gap of 0.5mm. The scraper is located inside the second mounting bracket 11. The wall penetration of the main shaft of the waist agitator 12 is sealed with a silicon carbide / graphite ring seal, and the scraper shaft end is sealed with a lip seal and a PTFE dirt-blocking ring.

[0045] The bottom agitator 14 is located 45-10cm from the discharge port at the bottom of the funnel (to prevent bottom suction and blockage). It is set as a three-bladed swept-back type (upward flow). In actual use, it pushes the settled fibers / binder upward to create a counterforce against the downward pressure at the top, preventing the bottom from accumulating and forming a dead zone. At the same time, it has high discharge capacity and low shear, making it suitable for suspended solids.

[0046] like Figure 1-2As shown, the bottom agitator 14 is directly connected to a hydraulic motor with stepless speed regulation (200-350 rpm) and is also equipped with a liquid level sensor interlock (stops rotation when liquid level < 30 cm). The discharge port 4 has a built-in discharge valve, which is a knife gate valve. The bottom hydraulic through section uses a bellows-type hydraulic seal and is equipped with a leakage detection chamber and an external pressure switch alarm. The mixing tank 1 has a funnel-shaped structure with a PTFE coating, forming a gradual flow field from top to bottom to avoid fiber sedimentation and achieve a zero-wall adhesion effect (wall residue < 0). To reduce raw material loss, the vibrating feeder in the feed inlet 2, in conjunction with the fluororubber vibration damping pad, effectively eliminates fiber bridging, improving feeding stability by 90% (amplitude fluctuation ≤ ±0.2mm). The dispersant is injected from the top, instantly wetting the fiber surface and improving dispersion efficiency by 40% (agglomeration rate <0.8%). The binder is injected at the waist with temperature control, effectively maintaining a viscosity of 350±50cP (temperature fluctuation ±1℃) to ensure uniform coating. Finally, the additive is injected at the bottom 7 with pulses to prevent excessively high local concentrations.

[0047] Furthermore, the top agitator 10 is configured as a double-bladed turbine (45° tilt angle) to generate an axial downward pressure flow of 2.8 m / s, which 100% compresses the floating fibers. The matching spiral scraper (50 mm pitch) actively cuts the entangled fibers, reducing the overload failure rate by 95%. At the same time, it is equipped with dual motors for independent drive and overload reversal, and responds within 200 ms when the current is >110%, ensuring continuous production.

[0048] Furthermore, the waist agitator 12 is configured with a folding blade and a PTFE scraper (0.5mm gap) to eliminate radial concentration gradient (gradient difference ≤5%), solve the problem of thin in the middle and thick at the edge, and at the same time, the silicon carbide / graphite seal can withstand high temperature of 250℃ and extend the seal life by 3 times (>10,000 hours).

[0049] Furthermore, the bottom agitator 14 is configured with a three-bladed swept impeller and hydraulic direct connection to generate an upward thrust flow of 4.2 m / s, completely eliminating the bottom dead zone (no settling). Combined with the liquid level interlock (stopping when <30 cm), it prevents the impeller from being damaged by idling, thus reducing the equipment failure rate.

[0050] Furthermore, the first mounting bracket 9, with its triangular rib at the root (thickness = 80% of the frame), enhances its bending moment resistance and eliminates the risk of breakage. The second mounting bracket 11, with its three-point radial support claws, effectively suppresses centrifugal deformation of the blade propeller (amplitude ≤ 0.05mm). The third mounting bracket 13, which is 60° trapezoidal and reinforced with a rubber and metal composite pad, effectively attenuates hydraulic vibration by 90% and extends bearing life.

[0051] When in use, this device prevents stratification and generates a strong turbulent zone (turbulent kinetic energy +40%) in the waist area due to vertical convection (2.8m / s↓+4.2m / s↑).

[0052] Zero damage, → tip linear velocity ≤ 5.8m / s + R angle ≥ 3mm → lowest fiber breakage rate in the industry;

[0053] High reliability: → Overload reversal + liquid level interlock + vibration damping → Downtime due to failure is reduced by 95%.

[0054] Maintenance-free: → PTFE coating + dynamic scraper → 90 days without disassembly and cleaning (traditional equipment requires weekly cleaning).

[0055] This solution achieves highly efficient, zero-damage, and unattended mixing of glass fiber raw materials through triple innovation in structure, materials, and control, providing a solution for filter paper production.

[0056] The working principle of this utility model is as follows: dry fiber material is fed in. Glass fiber is injected from the top main feed port 2 through a vibrating feeder. Fluororubber vibration isolation pads absorb vibration and prevent resonance transmission.

[0057] Then, the liquid components are injected synchronously, the dispersant solution is sprayed radially from the top auxiliary feed port (to wet the fiber surface), while the binder solution is injected from the waist 6 auxiliary feed ports (insulated by a 40℃ temperature-controlled jacket), and finally the additive is injected from the bottom 7 pulses (pneumatic quantitative control).

[0058] Next, the agitators are started. The bottom agitator 14 starts when the initial material reaches 10% of the liquid level (a built-in level gauge can be used for detection) to establish a basic flow field to prevent sedimentation. The top agitator 10 starts after the liquid level covers the impeller to suppress floating fibers. The waist agitator 12 starts after the liquid level reaches 50% of the waist level to block radial stratification. The top agitator 10 uses a 45° downward pressure flow to force and limit immersion, while the waist agitator 12 uses low-shear axial diffusion to eliminate the concentration gradient. The bottom agitator 14 pushes the flow upward at high speed to counteract the downward pressure from the top, and the combined effects form a vortex to enhance mixing, so that the fibers and binder are evenly coated.

[0059] During the mixing process, the PTFE scraper set at waist 6 rotates and scrapes (0.5mm gap). The PTFE coating reduces the surface energy. When the current is greater than 110% of the rated value, the top agitator reverses for 2 seconds and then restarts in the forward direction. If the restart fails three times, the entire line will be stopped. When the liquid level at the bottom is less than 30cm, the hydraulic motor will be automatically powered off, the knife gate valve will open, and the slurry will be discharged from the discharge port 4 at the bottom of the cone. When the valve plate is closed, the residue will be scraped off.

[0060] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A raw material mixing device for producing glass fiber filter paper, characterized in that: include: The funnel-shaped mixing tank (1) has a PTFE coating sprayed on the inner wall of its cavity, and the top (5) and bottom (7) are flared outwards, while the waist (6) is cylindrical. The support frame (3) is fixedly connected to the bottom of the mixing tank (1); The feed inlet (2) and the discharge outlet (4) are respectively located at the upper and lower ends of the mixing tank (1); A three-layer stirring mechanism is installed at the top, middle and bottom of the mixing tank (1); A stratified feeding system is installed on the mixing tank (1); The discharge port (4) has a built-in knife gate valve.

2. The raw material mixing device for producing glass fiber filter paper as described in claim 1, characterized in that: The three-layer mixing mechanism consists of: The top agitator (10) is fixed to the top (5) by a ring frame (8) and a first mounting frame (9), and its impeller is a 45° inclined blade turbine; The waist agitator (12) is fixed to the waist (6) by a horizontal second mounting bracket (11), and its impeller is set as a folding blade, and the main shaft is equipped with a PTFE scraper; The bottom agitator (14) is fixed to the bottom (7) by a trapezoidal third mounting bracket (13), and its impeller is a three-bladed swept-back type.

3. The raw material mixing device for producing glass fiber filter paper as described in claim 1, characterized in that: The stratified feeding system includes: The vibrating feeder built into the feed inlet (2) is provided with a fluororubber vibration isolation pad between it and the mixing tank (1); The dispersant pipeline is connected to the auxiliary feed port at the top of the mixing tank (1); The temperature-controlled jacketed adhesive pipeline is connected to the auxiliary feed inlet at the waist of the mixing tank (1); The mixing tank (1) has an independently installed additive pipeline at the bottom.

4. The raw material mixing device for producing glass fiber filter paper as described in claim 2, characterized in that: The first mounting bracket (9) has a triangular rib at its base, the second mounting bracket (11) has three radially distributed support claws, and the third mounting bracket (13) has a hypotenuse angle parallel to the cone wall and a rubber and metal composite gasket at the joint.

5. The raw material mixing device for producing glass fiber filter paper as described in claim 2, characterized in that: The top agitator (10) is driven independently by two motors, with a spiral scraper on the impeller hub and a double-end mechanical seal for the motor shaft seal.

6. The raw material mixing device for producing glass fiber filter paper as described in claim 2, characterized in that: The waist agitator (12) is belt driven and equipped with a torque limiter. The main shaft through-wall is sealed with silicon carbide / graphite seal, and the scraper shaft end is equipped with a lip seal and a PTFE dirt-blocking ring.

7. The raw material mixing device for producing glass fiber filter paper as described in claim 2, characterized in that: The bottom agitator (14) is directly connected to a hydraulic motor, and the hydraulic passage is sealed with a bellows and equipped with a leakage detection chamber.

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