Equipment and process for extrusion molding of bonded permanent ferrites in one-out-two

Abstract

The invention discloses a device and process for extruding a bonded permanent ferrite into two pieces. The device comprises an extruder, a chiller, a magnetizer, a traction machine and a winding machine which are arranged in sequence. The output end of the extruder is provided with a one-out-two extrusion die, the extrusion die comprises a die base and a die core arranged in the die base, the die base is made of ordinary die steel, the die core is made of hard alloy, and two extrusion holes arranged side by side are arranged in the die core. The chiller is provided with circulating water capable of controlling the temperature. The fluidity of the material in a viscous flow state is improved by adopting a specific auxiliary agent, a granular material is prepared according to a special formula, and then an extrusion die with a specific structure is used, and three independently controlled magnetizing, traction and winding systems are used to realize the production of the one-out-two ferrite magnetic strips, avoid causing back pressure to the screw barrel and burning the motor, slow down the wear of the screw barrel, improve the production efficiency, reduce the energy consumption, and thus bring convenience to the production operation.

Description

Technical Field

[0001] The invention relates to the technology of producing and manufacturing bonded permanent ferrite, in particular to equipment and process for extruding bonded permanent ferrite into two pieces. Background Art

[0002] At present, the extrusion molding machine of bonded permanent ferrite (commonly known as magnetic strip extruder) is "one out one" when molding magnetic strips, that is, one machine only extrude one product at a time. The main reasons for this situation are:

[0003] 1. During the forming process of bonded permanent ferrite strips, even in the viscous flow state, the viscosity is very high and the fluidity is very poor due to the characteristics of the material. Even "one out of one" is not easy. Perhaps for this reason, no one has tried this.

[0004] 2. The bonded permanent ferrite industry is small and has limited uses. Scientific research institutions do not pay attention to it, and no scientific researchers pay attention to this industry.

[0005] 3. The subsequent equipment after "one out of two" extrusion molding is very complicated: the molding mold needs to be "one out of two", the traction needs to be "one out of two", the magnetization needs to be "one out of two", and the winding needs to be "one out of two", and the difficulty of systematization is very high.

[0006] The extrusion molding machine (magnetic strip extruder) of bonded permanent ferrite was introduced to China by the Italian IOS company in the 1980s, mainly used for the production of refrigerator magnetic strips. For more than 30 years, the magnetic strip extruder has been independently developed, improved and produced by the manufacturers of magnetic strips based on the original IOS company's equipment, and there has been no professional manufacturer of this type of equipment.

[0007] The cross-section of refrigerator magnetic strips is generally 2x8mm, 3x9mm, 4x8mm, 3x10mm, and the screw of the magnetic strip extruder is generally Φ60mm, which is more suitable for this type of product, so there is not much technological progress.

[0008] However, with the expansion of the application field of magnetic strips and the emergence of smaller products, a "big horse pulling a small cart" situation has emerged, resulting in problems such as high power consumption of the equipment, low output, and severe wear of the screw and barrel.

[0009] Traditional magnetic strip extruders can generally only produce products with a cross-sectional area of ​​≥15mm² and a thickness of >1.0mm. However, in the process of market development, there is often a demand for smaller products, such as small products with cross-sections of 8x1mm, 6x1mm, Φ3mm, etc. If they are still "one out of one", it will inevitably cause great back pressure on the screw barrel, resulting in low production efficiency, high energy consumption, easy wear of the screw barrel, and serious problems such as burning out of the motor.

[0010] Due to the current situation and difficulties of the magnetic stripe extruder, the existing technical level of the magnetic stripe extruder can no longer meet the market demand. Therefore, it is necessary to study a solution to solve the above problems. Summary of the invention

[0011] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a one-out-two device and process for extruding bonded permanent magnet ferrites, which can avoid the "big horse pulling a small cart" situation and effectively improve production efficiency.

[0012] To achieve the above purpose, the present invention adopts the following technical solutions:

[0013] A one-out-two extrusion device for bonded permanent ferrites comprises an extruder, a chiller, a magnetizer, a traction machine and a winder which are arranged in sequence; the output end of the extruder is provided with a one-out-two extrusion die, the extrusion die comprises a die base and a die core arranged in the die base, the die base is made of ordinary die steel, the die core is made of hard alloy, and two extrusion holes arranged side by side are arranged in the die core; the chiller has circulating water with controllable temperature; the magnetizer comprises two independent magnetizing systems and two magnetizing seats; the traction machine has two sets of independently controlled traction devices, and the two sets of independently controlled traction devices are installed on the chiller; the winder has two independently controlled winding devices, and the two independently controlled winding devices are installed at the very end of the equipment.

[0014] As a preferred solution, a die feed channel is provided on the inner side surface of the die base, the die feed channel is in a "W" shape, and both extrusion holes are connected to the die feed channel.

[0015] As a preferred solution, the chiller has a circulating water system capable of controlling temperature.

[0016] As a preferred solution, two sets of traction wheels of the traction machine are arranged at the rear end of the water tank of the chiller, and the two sets of traction wheels are controlled by two independent traction systems, and the traction systems are divided into two control methods: automatic and manual.

[0017] A process for extruding a bonded permanent ferrite into two pieces, using the above-mentioned equipment for extruding a bonded permanent ferrite into two pieces, comprises the following steps:

[0018] (1) The following raw materials in weight percentage are mixed and granulated to obtain a granular material: ferrite magnetic powder 85%-91%, chlorinated polyethylene CPE-130A 7%-13%, epoxy soybean oil 0.3%-0.8%, calcium stearate 0.02%-0.07%, zinc stearate 0.02%-0.07%, and titanate coupling agent 0.7%-1.2%;

[0019] (2) Put the granular material into the extruder, and the extruder works to extrude two ferrite magnetic strips side by side from the extrusion die;

[0020] (3) The two ferrite magnetic strips are pulled into the chiller for cooling, and then enter the magnetizing seat after air drying;

[0021] (4) The two ferrite magnetic strips enter two magnetizing seats respectively for magnetization to become ferrite magnetic strips with magnetic properties;

[0022] (5) The two ferrite strips are respectively wound up by two winding devices of the winding machine.

[0023] As a preferred solution, the ferrite powder Fe 12 O 19 The mass content of Sr is ≥91%, the particle size is ≤2.5μm, the chlorine content in chlorinated polyethylene CPE-130A is 28%-32%, and the tensile strength is ≥8Mpa.

[0024] As a preferred solution, the epoxy value of the epoxidized soybean oil is ≥36, and the thermal stability value is ≥5.7; the melting point of calcium stearate is 120°C, and the calcium content is 7%; the melting point of zinc stearate is 120°C, and the zinc content is 10%; the viscosity of the titanate coupling agent at 40°C is 20-25Mpa.s, the activation degree is ≥98%, and the viscosity reduction amplitude is ≥97.

[0025] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0026] By using specific auxiliary agents to improve the fluidity of the material in the viscous flow state, the granular material is prepared according to a special formula, and then using an extrusion die with a specific structure and three independently controlled magnetizing, traction and winding systems, the production of two ferrite magnetic strips can be achieved, avoiding back pressure on the screw barrel and burning the motor, slowing down the wear of the screw barrel, improving production efficiency, and reducing energy consumption, thereby bringing convenience to production operations.

[0027] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of a preferred embodiment of the present invention;

[0029] Figure 2 is a top view of a preferred embodiment of the present invention;

[0030] Figure 3 It is a front view of the extrusion die in a preferred embodiment of the present invention;

[0031] Figure 4 It is a cross-sectional view of an extrusion die in a preferred embodiment of the present invention.

[0032] Description of the accompanying drawings:

[0033] 10. Extruder 11. Extrusion die

[0034] 111, mold base 112, mold core

[0035] 101, extrusion hole 102, die flow channel

[0036] 103, cavity 20, chiller

[0037] 21. Conveyor guide wheel 22. Air dryer

[0038] 30. Magnetizing machine 31. Magnetizing system

[0039] 32. Magnetizing seat 40. Traction machine

[0040] 41. Traction device 411. Traction wheel

[0041] 50. Winding machine 51. Winding device. DETAILED DESCRIPTION

[0042] Please refer to Figures 1 to 4 As shown, it shows the specific structure of a preferred embodiment of the present invention, a one-out-two device for extruding bonded permanent magnet ferrite, including an extruder 10, a chiller 20, a magnetizer 30, a traction machine 40 and a winder 50 arranged in sequence.

[0043] The output end of the extruder 10 is provided with an extrusion die 11 with one outlet and two outlets. The extrusion die 11 includes a die base 111 and a die core 112 arranged in the die base 111. The die core 112 is made of cemented carbide, and two extrusion holes 101 arranged side by side are passed through the die core 112. In this embodiment, the die base 111 is made of ordinary mold steel, and the die core 112 is made of cemented carbide. The inner side surface of the die base 111 is provided with a die feed channel 102, and the die feed channel 102 connects the two extrusion holes 101. The die feed channel 102 is "W"-shaped, and the die base 111 is provided with a concave cavity 103. The die core 112 is embedded in the concave cavity 103, and the die core 112 is flush with the outer side surface of the die base 111.

[0044] The chiller 20 has two sets of front and rear conveying guide wheels 21; the chiller 20 is provided with two air dryers 22. In the present embodiment, a traction machine 40 is provided at the rear end of the chiller 20. The traction machine 40 has two sets of independently controlled traction devices 41. The two sets of independently controlled traction devices 41 are installed on the chiller 20. Each traction device 41 has a traction wheel 411, and each traction wheel 411 is controlled by an independent control system.

[0045] The magnetizer 30 includes two independent magnetizing systems 31 and two magnetizing seats 32 .

[0046] The winder 50 has two independently controlled winders 51 , which are installed at the rear end of the device.

[0047] The present invention also discloses a production process for extruding a bonded permanent ferrite into two pieces, which uses the above-mentioned equipment for extruding a bonded permanent ferrite into two pieces, and comprises the following steps:

[0048] (1) The following raw materials in percentage by weight are mixed and granulated to obtain a granular material: 85%-91% ferrite magnetic powder, 7%-13% chlorinated polyethylene CPE-130A, 0.3%-0.8% epoxidized soybean oil, 0.02%-0.07% calcium stearate, 0.02%-0.07% zinc stearate, and 0.7%-1.2% titanate coupling agent, wherein the titanate coupling agent is used to uniformly mix the organic raw material and the inorganic raw material, and the fluidity of the flow material can be improved after mixing. The ferrite magnetic powder contains Fe 12 O 19 The mass content of Sr is ≥91%, the particle size is ≤2.5μm, the chlorine content in CPE-130A is 28%-32%, and the tensile strength is ≥8Mpa. The epoxy value of the epoxy soybean oil is ≥36, and the thermal stability value is ≥5.7; the melting point of calcium stearate is 120°C, and the calcium content is 7%; the melting point of zinc stearate is 120°C, and the zinc content is 10%; the viscosity of the titanate coupling agent at 40°C is 20-25Mpa.s, the activation degree is ≥98%, and the viscosity reduction amplitude is ≥97. In this embodiment, the preferred formula is: ferrite magnetic powder 87%, chlorinated polyethylene CPE-130A 11.50%, epoxy soybean oil 0.50%, calcium stearate 0.05%, zinc stearate 0.05%, titanate coupling agent 0.9%. This formula has better compatibility of raw materials, better fluidity, and is more conducive to one-out-two extrusion molding.

[0049] (2) The granular material is placed in the extruder 10, and the extruder 10 is operated to extrude two side-by-side ferrite magnetic strips from the extrusion die 11.

[0050] (3) The two ferrite strips are drawn into the chiller 20 for cooling, and then air-dried in the air dryer 22 before entering the magnetizing seat 32.

[0051] (4) The two ferrite strips enter the two magnetizing seats 32 respectively for magnetization to become ferrite strips with magnetic properties.

[0052] (5) The two magnetic strips are respectively wound up by two winding devices 51 of the winding machine 50 .

[0053] The design focus of the present invention is: by adopting specific auxiliary agents to improve the fluidity of the material in a viscous flow state, the granular material is prepared according to a special formula, and then an extrusion die with a specific structure and three independently controlled magnetization, traction and winding systems are used to achieve the production of two ferrite magnetic strips in one, avoid back pressure on the screw barrel and burn out the motor, slow down the wear of the screw barrel, improve production efficiency, reduce energy consumption, and thus bring convenience to production operations.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A process for extruding bonded permanent ferrite into two pieces, characterized in that: A one-out-two extrusion device for bonded permanent ferrite extrusion molding is adopted, and the one-out-two extrusion device for bonded permanent ferrite extrusion molding comprises an extruder, a chiller, a magnetizer, a traction machine and a winder which are arranged in sequence; an extruder output end is provided with a one-out-two extrusion die, the extrusion die comprises a die base and a die core arranged in the die base, the die base is made of ordinary die steel, the die core is made of hard alloy, and two extrusion holes arranged side by side are arranged in the die core; circulating water with controllable temperature is provided in the chiller; the magnetizer comprises two independent magnetizing systems and two magnetizing seats; the traction machine has two sets of independently controlled traction devices, and the two sets of independently controlled traction devices are installed on the chiller; the winder has two independently controlled winding devices, and the two independently controlled winding devices are installed at the very end of the equipment; The following steps are included: (1) The following raw materials in weight percentage are mixed and granulated to obtain granular materials: 85%-91% ferrite magnetic powder, chlorinated polyethylene CPE-130A 7%-13%, 0.3%-0.8% epoxy soybean oil, 0.02%-0.07% calcium stearate, 0.02%-0.07% zinc stearate, 0.7%-1.2% titanate coupling agent; the mass content of Fe12O19Sr in the ferrite magnetic powder is ≥91%, and the particle size is ≤2.5μm; the chlorine content in chlorinated polyethylene CPE-130A is 28%-32%, and the tensile strength is ≥8Mpa; the epoxy value of the epoxy soybean oil is ≥36, and the thermal stability value is ≥5.7; the melting point of calcium stearate is 120℃, and the calcium content is 7%; the melting point of zinc stearate is 120℃, and the zinc content is 10%; the viscosity of the titanate coupling agent at 40℃ is 20-25Mpa.s, the activation degree is ≥98%, and the viscosity reduction range is ≥97; (2) placing the granular material into an extruder, and the extruder works to extrude two ferrite magnetic strips side by side from the extrusion die; (3) The two ferrite magnetic strips are pulled into the chiller for cooling, and then enter the magnetizing seat after air drying; (4) The two ferrite magnetic strips enter two magnetizing seats respectively for magnetization to become ferrite magnetic strips with magnetic properties; (5) The two ferrite magnetic strips are respectively wound up by two winding devices of the winding machine.

2. The one-out-two extrusion process for bonded permanent ferrite according to claim 1, characterized in that: The inner side surface of the die base is provided with a die feed flow channel, the die feed flow channel is "W" shaped, and the two extrusion holes are connected to the die feed flow channel.

3. The one-out-two extrusion process for bonded permanent ferrite according to claim 1, characterized in that: The chiller has a circulating water system capable of controlling temperature.

4. The one-out-two extrusion process for bonded permanent ferrite according to claim 1, characterized in that: Two sets of traction wheels of the traction machine are arranged at the rear end of the water tank of the chiller. The two sets of traction wheels are controlled by two sets of independent traction systems. The traction systems are divided into two control methods: automatic and manual.

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