Polytetrafluoroethylene raw material production mixing device

Abstract

The invention belongs to the technical field of polytetrafluoroethylene production, and particularly relates to a polytetrafluoroethylene raw material production mixing device which comprises a cylindrical mixing shell, a feeding port is formed in the top of the mixing shell, and a mixing assembly is mounted at the top of the mixing shell. The mixing assembly mixes granular polytetrafluoroethylene and powdery silicon dioxide, supporting assemblies are installed on the two sides of the mixing shell, supports of the supporting assemblies fix the mixing shell through bearings, and shaft bodies of overturning motors of the supporting assemblies penetrate through inner shafts of the bearings to be connected with the mixing shell. The mixing shell is transversely arranged by starting an overturning motor, powdery silicon dioxide and granular polytetrafluoroethylene are mixed by starting a mixing assembly and are periodically paused, and a hydraulic cylinder of a powder scraping assembly is started to drive a hydraulic rod and a scraper to scrape off the powdery silicon dioxide adhered to the inner wall of the mixing shell; the situation that powdery objects easily sink to the bottom and are hung on the wall during mixing is avoided, and uniform mixing of powder and particle materials can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of polytetrafluoroethylene production, in particular to a polytetrafluoroethylene raw material production mixing device. Background Art

[0002] Polytetrafluoroethylene also has excellent electrical insulation, flame retardancy and weather resistance, and has extremely low water absorption. It has unique properties such as self-lubrication, flame retardancy and non-stickiness.

[0003] An existing patent (publication number CN118024440B) and a polytetrafluoroethylene raw material mixing device are disclosed. The raw materials are mixed by the patent. During the mixing process, horizontal stirring and upside-down inversion can be performed simultaneously to improve the mixing efficiency and prevent different raw materials from sinking to the bottom and separating due to different densities and failing to mix thoroughly. However, when polytetrafluoroethylene particles and powdered materials are mixed, the powdered materials in the above patent are very likely to sink to the bottom during the mixing, and the powdered materials that sink to the bottom cannot participate in the mixing process again, which will lead to uneven mixing of powder and granules, and the powdered materials are also easy to adhere to the inner wall of the mixing container, which is prone to uneven mixing ratio of particles and powder.

[0004] Therefore, we propose a polytetrafluoroethylene raw material production mixing device to prevent powdered objects from sinking to the bottom and hanging on the wall during mixing, which is beneficial to improving the uniform mixing of powder and granular materials, increasing the mixing effect of powder and granules, and avoiding partial accumulation of powder. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a polytetrafluoroethylene raw material production mixing device to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a polytetrafluoroethylene raw material production mixing device, comprising a mixing shell, the mixing shell is cylindrical, a feed port is opened on the top of the mixing shell, a mixing assembly is installed on the top of the mixing shell, the mixing assembly mixes granular polytetrafluoroethylene and powdered silicon dioxide, support assemblies are installed on both sides of the mixing shell, the bracket of the support assembly fixes the mixing shell through a bearing, the shaft of the flip motor of the support assembly passes through the inner shaft of the bearing to connect the mixing shell, and the mixing shell is formed into a horizontal shape by the flip motor;

[0007] A powder scraping assembly is installed on the top of the mixing shell, a hydraulic rod is slidably installed at the bottom of the hydraulic cylinder of the powder scraping assembly, a scraper is connected to the bottom of the hydraulic rod, and the scraper is attached to the inner wall of the mixing shell to scrape off the powdered silicon dioxide.

[0008] Furthermore: the mixing motor of the mixing assembly is located at the center of the top surface of the mixing shell, the stirring rod of the mixing motor penetrates the mixing shell and extends to the bottom of the mixing shell, the outer wall of the stirring rod is equidistantly provided with mixing rods, and the end of the mixing rod is connected to a stirring plate.

[0009] Furthermore: the stirring plate is in the shape of an arc shovel, an angle sensor is installed on the outer wall of the stirring rod, the angle sensor is set with three fixed angles, and the powder scraping assembly is started when the stirring rod is at any of the three fixed angles.

[0010] Furthermore: the three fixed-point angles are 120°, 240° and 360°, and at the three fixed-point angles, the position of the stirring plate and the position of the scraper are staggered.

[0011] Furthermore: an electric heating plate is arranged inside the mixing shell, and the electric heating plate is started synchronously when the mixing assembly is started, and the heat of the electric heating plate makes the powdered silicon dioxide adhere to the outer wall of the granular polytetrafluoroethylene.

[0012] Further: a discharge valve is arranged at the bottom of the mixing shell.

[0013] Compared with the prior art, the technical effects and advantages of the present invention are as follows:

[0014] 1) The polytetrafluoroethylene raw material production mixing device of the present invention has a flip motor and a powder scraping assembly, and starts the flip motor to place the mixing shell horizontally, and starts the mixing assembly to mix the powdered silicon dioxide and the granular polytetrafluoroethylene, and periodically pauses, and starts the hydraulic cylinder of the powder scraping assembly to drive the hydraulic rod and the scraper to scrape off the powdered silicon dioxide adhered to the inner wall of the mixing shell, so as to avoid the powdered objects from sinking to the bottom and hanging on the wall during mixing, which is beneficial to improving the uniform mixing of the powder and granular materials.

[0015] 2) The polytetrafluoroethylene raw material production mixing device of the present invention, through the setting of the heating plate and the mixing component, detects the rotation angle of the stirring rod of the mixing component through the angle sensor, and sets three fixed angles. When the inner wall of the mixing shell needs to be cleaned, the powder scraping component staggered with the stirring plate can be started. The powdered silicon dioxide and granular polytetrafluoroethylene are heated by the heating plate, which can make the powdered silicon dioxide more easily adhere to the outer wall of the granular polytetrafluoroethylene, which is beneficial to increase the mixing effect of the powder and the particles and avoid the partial accumulation of the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall internal structure of the present invention;

[0018] Figure 3It is a schematic diagram of the structure of the mixing assembly of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the powder scraping assembly of the present invention.

[0020] The accompanying drawings are marked as follows: 1. mixing shell; 11. discharge valve; 2. mixing assembly; 21. mixing motor; 22. angle sensor; 23. mixing rod; 24. stirring plate; 25. stirring rod; 3. powder scraping assembly; 31. hydraulic cylinder; 32. hydraulic rod; 33. scraper; 4. feed port; 5. support assembly; 51. bearing; 52. flip motor; 53. bracket; 6. electric heating plate. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the structures involved in the present invention are not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0022] Example:

[0023] See also Figure 1-4 The present invention provides a technical solution: a polytetrafluoroethylene raw material production mixing device, comprising a mixing shell 1, the mixing shell 1 is cylindrical, the mixing shell 1 is cylindrical, and its bottom is funnel-shaped, the top of the mixing shell 1 is provided with a feed port 4, granular polytetrafluoroethylene and powdered silicon dioxide are added into the mixing shell 1 through the feed port 4, and the feed port 4 is sealed by a cover, a mixing assembly 2 is installed on the top of the mixing shell 1, the mixing assembly 2 mixes the granular polytetrafluoroethylene and the powdered silicon dioxide, support assemblies 5 are installed on both sides of the mixing shell 1, the bracket 53 of the support assembly 5 fixes the mixing shell 1 through a bearing 51, the shaft body of the flip motor 52 of the support assembly 5 passes through the inner shaft of the bearing 51 to connect the mixing shell 1, the mixing shell 1 is formed into a horizontal shape by the flip motor 52, and the mixing shell 1 is driven to rotate and become horizontal by starting the flip motor 52;

[0024] A powder scraping assembly 3 is installed on the top of the mixing shell 1, a hydraulic rod 32 is slidably installed at the bottom of the hydraulic cylinder 31 of the powder scraping assembly 3, a scraper 33 is connected to the bottom of the hydraulic rod 32, and the scraper 33 is attached to the inner wall of the mixing shell 1 to scrape off the powdered silicon dioxide;

[0025] The mixing component 2 is periodically paused, and the hydraulic cylinder 31 of the powder scraping component 3 is started to drive the hydraulic rod 32 and the scraper 33 to scrape off the powdered silicon dioxide adhered to the inner wall of the mixing shell 1. The mixing shell 1 is turned over to prevent the powdered objects from sinking to the bottom during mixing. The powder hanging on the wall is periodically scraped off by the scraper 33, thereby improving the uniform mixing of the powder and the granular materials.

[0026] The mixing motor 21 of the mixing assembly 2 is located at the center of the top surface of the mixing shell 1, and the stirring rod 25 of the mixing motor 21 penetrates the mixing shell 1 and extends to the bottom of the mixing shell 1. The outer wall of the stirring rod 25 is equidistantly provided with mixing rods 23, and the end of the mixing rod 23 is connected to a stirring plate 24;

[0027] The mixing motor 21 is started to drive the stirring rod 25 to rotate, and then the stirring rod 25 drives the mixing rod 23 and the stirring plate 24 to rotate synchronously, and the powder and the particles are stirred and mixed by the rotation of the mixing rod 23 and the stirring rod 25.

[0028] The stirring plate 24 is in the shape of an arc shovel, and the arc shovel-shaped stirring plate 24 can lift up the powder and particles, and lift up the powder settled at the lowest point of the mixing shell 1;

[0029] The outer wall of the stirring rod 25 is installed with an angle sensor 22, and the angle sensor 22 is set with three fixed angles. When the stirring rod 25 is at any of the three fixed angles, the powder scraping assembly 3 is started. The three fixed angles are 120°, 240° and 360°. At the three fixed angles, the position of the stirring plate 24 and the position of the scraper 33 are staggered.

[0030] The rotation angle of the stirring rod 25 of the mixing assembly 2 is detected by the angle sensor 22, and three fixed-point angles are set. When the inner wall of the mixing shell 1 needs to be cleaned, the powder scraping assembly 3 staggered with the stirring plate 24 is started.

[0031] Among them, an electric heating plate 6 is arranged inside the mixing shell 1, and the electric heating plate 6 is started synchronously when the mixing component 2 is started. The heat of the electric heating plate 6 makes the powdered silicon dioxide adhere to the outer wall of the granular polytetrafluoroethylene. Under the action of high temperature, the silicon dioxide powder will adhere to the outer wall of the polytetrafluoroethylene particles by physical adsorption or chemical bonding.

[0032] Wherein, a discharge valve 11 is arranged at the bottom of the mixing shell 1, and the mixed material is discharged through the discharge valve 11.

[0033] Polytetrafluoroethylene is widely used in many fields due to its excellent chemical stability, aging resistance, electrical insulation, radiation resistance, and extremely low water absorption. However, problems such as low mechanical strength, poor wear resistance, and temperature adaptability of polytetrafluoroethylene limit its application scenarios.

[0034] Among many modified filling materials, silica not only has high hardness, strong corrosion resistance and good electrical insulation, but also is very easy to be surface treated with coupling agents, and its crystal morphology will not change during the molding process. Adding it as a filler into the polytetrafluoroethylene matrix will not change the crystal structure of the polytetrafluoroethylene matrix, which makes silica modification of polytetrafluoroethylene an option.

[0035] Silica filler powder can help the soft matrix material polytetrafluoroethylene to transfer to the counter surface in the form of a transfer film, and the silica filler powder, as a medium between the polytetrafluoroethylene film and the steel table, can act as an interface by absorbing surrounding moisture, which helps to form a transfer film with low shear strength on the surface of the friction pair. The transfer film will firmly adhere to the surface of the friction pair. Therefore, the direct contact between the composite material sample and the friction pair is effectively reduced, the transfer film plays the role of a lubricating film, and the friction coefficient of the sample is reduced.

[0036] In addition, the wear rate of the composite material is also limited by the formation of the transfer film. Therefore, the addition of silica can effectively improve the friction reduction and anti-wear properties of the silica / polytetrafluoroethylene composite material.

[0037] The working principle of the embodiment of the present invention is as follows: granular polytetrafluoroethylene and powdered silicon dioxide are added into the mixing shell 1 through the feed port 4, and the feed port 4 is sealed with a cover, and then the mixing shell 1 is driven to rotate and be horizontal by starting the flip motor 52;

[0038] The mixing motor 21 is started to drive the stirring rod 25 to rotate, and then the stirring rod 25 drives the mixing rod 23 and the stirring plate 24 to rotate synchronously, and the powder and the particles are stirred and mixed by the rotation of the mixing rod 23 and the stirring rod 25. During the mixing process, the electric heating plate 6 is started to increase the internal temperature of the mixing shell 1;

[0039] The rotation angle of the stirring rod 25 of the mixing component 2 is detected by the angle sensor 22, and three fixed-point angles are set. When the inner wall of the mixing shell 1 needs to be cleaned, the mixing component 2 is periodically paused, and the powder scraping component 3 staggered with the stirring plate 24 is started. The hydraulic cylinder 31 of the powder scraping component 3 is started to drive the hydraulic rod 32 and the scraper 33 to scrape off the powdered silicon dioxide adhered to the inner wall of the mixing shell 1. The mixing shell 1 is turned over to prevent the powdered objects from sinking to the bottom during mixing, and the powder hanging on the wall is periodically scraped off by the scraper 33;

[0040] The mixed material is discharged from the discharge valve 11 by opening the discharge valve 11 .

[0041] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polytetrafluoroethylene raw material production mixing device, comprising a mixing shell (1), the mixing shell (1) is cylindrical, a feed inlet (4) is provided on the top of the mixing shell (1), a mixing assembly (2) is installed on the top of the mixing shell (1), the mixing assembly (2) mixes granular polytetrafluoroethylene and powdered silicon dioxide, and is characterized in that: Support assemblies (5) are installed on both sides of the mixing shell (1); a bracket (53) of the support assembly (5) fixes the mixing shell (1) via a bearing (51); an axis of a flip motor (52) of the support assembly (5) passes through the inner axis of the bearing (51) and is connected to the mixing shell (1); the mixing shell (1) is formed into a horizontal shape by the flip motor (52); A powder scraping assembly (3) is installed on the top of the mixing shell (1), a hydraulic rod (32) is slidably installed at the bottom of the hydraulic cylinder (31) of the powder scraping assembly (3), a scraper (33) is connected to the bottom of the hydraulic rod (32), and the scraper (33) is attached to the inner wall of the mixing shell (1) to scrape off the powdered silicon dioxide.

2. A polytetrafluoroethylene raw material production mixing device according to claim 1, characterized in that: The mixing motor (21) of the mixing assembly (2) is located at the center of the top surface of the mixing shell (1), the stirring rod (25) of the mixing motor (21) penetrates the mixing shell (1) and extends to the bottom of the mixing shell (1), the outer wall of the stirring rod (25) is equidistantly provided with mixing rods (23), and the end of the mixing rod (23) is connected to a stirring plate (24).

3. A polytetrafluoroethylene raw material production mixing device according to claim 2, characterized in that: The stirring plate (24) is in the shape of an arc shovel. An angle sensor (22) is installed on the outer wall of the stirring rod (25). The angle sensor (22) is set with three fixed angles. When the stirring rod (25) is at any of the three fixed angles, the powder scraping assembly (3) is started.

4. A polytetrafluoroethylene raw material production mixing device according to claim 3, characterized in that: The three fixed-point angles are 120°, 240° and 360°, and at the three fixed-point angles, the position of the stirring plate (24) and the position of the scraper (33) are staggered.

5. A polytetrafluoroethylene raw material production mixing device according to claim 2, characterized in that: An electric heating plate (6) is arranged inside the mixing shell (1), and the electric heating plate (6) is started synchronously when the mixing assembly (2) is started. The heat of the electric heating plate (6) causes the powdered silicon dioxide to adhere to the outer wall of the granular polytetrafluoroethylene.

6. A polytetrafluoroethylene raw material production mixing device according to claim 1, characterized in that: A discharge valve (11) is provided at the bottom of the mixing shell (1).

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