CN105810428A - Variable-speed sensing signal component and processing technology therefor - Google Patents

Abstract

The invention discloses a variable speed induction signal component and its processing technology. The component comprises a plastic substrate and a magnetic ring. The central hole of the magnetic ring is a tapered structure with a narrow upper opening and a wider lower opening. A ring of anti-slip grooves with equal intervals, a plastic base is provided in the center hole of the magnetic ring, and a circle of helical teeth for gap adjustment is also provided on the inner edge of the plastic base, and a circular shaft hole is formed in the center of the helical teeth; The component is processed through several steps of extrusion, crushing, magnetic ring forming, demagnetization and magnetization, and integral injection molding. This kind of variable speed sensing signal component and the matching shaft have a high degree of tightness and firmness, and are not easy to crack , the coordination is adjustable and flexible, and the production cost is much lower.

Description

A variable speed sensing signal component and its processing technology

technical field

The invention relates to a variable speed sensing signal component suitable for the field of stepping electric vehicles or electric vehicles, in particular to a variable speed sensing signal component and a processing technology thereof.

Background technique

Variable speed sensing signal components are usually used in stepper electric vehicles or electric vehicles to achieve precise speed change functions, instead of the traditional use of sliding resistors or changing current to achieve speed change purposes. After long-term exploration, the current most used is to use The variable-speed induction signal components produced by completely magnetic materials have strong induction signal capabilities, but the high-speed rotating centrifugal force generated by this completely magnetic material will cause the magnetic ring to break, which will seriously affect its service life, and complete magnetism will lead to production failure. The cost is increased, and the existing variable speed sensing signal components have defects in their structure, because the mating shaft will expand with heat and contract with cold during operation, so there will be some errors in the gap, and the existing structure leads to It lies in that the matching shafts are not tightly matched or cracked or fall off due to overtightening, and the above-mentioned gap errors that exist cannot be flexibly adjusted. Such structural defects have serious safety hazards.

Contents of the invention

In view of the above existing problems, the present invention aims to provide a variable speed sensing signal component and its processing technology. This kind of variable speed sensing signal component and the matching shaft have a high degree of tightness and firmness, and are not easy to crack. Flexibility, and the cost of production is much lower.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A variable speed induction signal component, the component includes a plastic base and a magnetic ring, the central hole of the magnetic ring is a tapered structure with a narrow upper opening and a wider lower opening, and a circle of spacing distance is set on the upper end surface of the magnetic ring Equal anti-off grooves, the plastic base is provided in the central hole of the magnetic ring, and a circle of helical teeth for gap adjustment is also provided on the inner edge of the plastic base, and the center of the helical teeth forms a circular shaft hole.

Preferably, the inner diameter of the upper opening of the central hole of the magnetic ring is 2-3mm smaller than the inner diameter of the lower opening.

Preferably, a ring of anti-rotation grooves is provided upwardly on the inner side of the lower end surface of the magnetic ring.

Preferably, each of the anti-rotation grooves is arranged in the middle of the two anti-loosening grooves, and the height of the anti-rotation grooves is lower than that of the magnetic ring.

Preferably, the upper end surface of the plastic base body is integrally processed with anti-off pins corresponding to the anti-off grooves one by one, the four anti-off grooves are provided, and the outer surface of the plastic base is also integrally processed The anti-rotation pins corresponding to the anti-rotation grooves one by one.

Preferably, the plastic base is made of ABS resin material.

A processing technology for variable speed sensing signal components, comprising the following steps:

1) Screening of magnetic ring raw materials: Weigh qualified raw materials such as strontium ferrite, nylon 66, cumyl peroxide, and silane coupling agent, and pass them through 80, 100, and 120 mesh sieves according to the type for three times. level screening;

2) Weighing: Weigh the sieved raw materials of strontium ferrite, nylon 66, cumene peroxyneodecanoate, and silane coupling agent according to the ratio of 88:9:1.2:1, and set aside;

3) primary mixing and stirring: the raw materials sieved in step (2) enter into the mixer for mixing in turn, and the stirring speed is 100-150r/min;

4) Drying: The mixture enters the dryer for drying. The drying temperature is 100-120°C. The temperature during the drying process starts from 0°C and gradually increases to 5°C per minute. 100-120 ℃, and heat preservation and drying for 1-1.5 hours;

5) One-time extrusion: the mixed material enters the extruder for extrusion molding, and the material is extruded in a molten state, and the extrusion temperature is 250-270 °C;

6) Primary crushing: the extruded crude product is crushed once in the crusher, and after the crushing, the rare earth magnetic material analysis spectrometer is used for initial test inspection;

7) Secondary mixing and stirring: the crushed crude product particles enter the mixer for secondary mixing and stirring, and the stirring speed is 200-250r/min;

8) Secondary extrusion: the secondary compound enters the extruder for secondary extrusion molding, and the extrusion temperature is 250-270°C;

9) Secondary crushing: The semi-finished products formed by secondary extrusion are subjected to secondary crushing by the crusher, and after crushing, the rare earth magnetic material analysis spectrometer is used for secondary testing and inspection;

10) Magnetic ring injection molding: The semi-finished granules that have been crushed for the second time in step (9) are fed sequentially through the feed port of the molding machine. The mold is equipped with a release slope of 2-3 mm on one side, and a magnetic field is also set in the mold. Orientation, after the magnetic field orientation of the mold, a circle of magnetic ring is injection molded; there is a drying pipeline in the mold to dry the magnetic ring in time, and the drying pipeline is ventilated at the same time to take away the moisture in time. The drying temperature is 90 -100°C, the upper end of the magnetic ring is provided with a ring of anti-slip grooves, and the inner surface of the lower end is provided with a ring of anti-rotation grooves;

11) Demagnetization and magnetization: The magnetic ring after the orientation of the magnetic field is demagnetized first, and then magnetized in the customized magnetizing chuck to achieve the required magnetic pole purpose;

12) Integral injection molding: After the magnetic ring part in step (10) is injected with the anisotropic orientation of the mold, it is used as an insert for secondary injection molding of the plastic matrix wrapping part, and ABS resin material is selected as the material of the plastic matrix. The two-way fixing of the anti-loosening groove and the anti-rotation groove designed in the middle, the two are firmly combined, so as to achieve the effect of being used as a whole without being damaged.

Preferably, in the step (5) "primary extrusion" and the step (8) "secondary extrusion", a preheating device is installed at the feed end of the extruder.

Preferably, the pre-heating device is arranged above the feed hopper of the extruder, the temperature is raised and heated by a built-in heating element, and a temperature sensor is set to control the heating temperature, and the pre-heating device is sealed and connected to the feed hopper. And a small stirrer is installed in the preheating device.

Preferably, in the step (12) of "integral injection molding", a circle of axial helical teeth is also integrally injection molded along the inner edge of the plastic base.

The beneficial effects of the present invention are: compared with the prior art,

One: the present invention uses ABS resin material as the plastic matrix of the variable speed induction signal component, and then combines with the magnetic ring to save production costs, good physical properties, and good stability;

Second: the two material structures of the present invention: the plastic base and the magnetic ring are realized by the anti-slip groove and the tapered structure of the magnetic ring. The setting of the tapered structure greatly improves the stability and firmness of the combination of the two;

Third, in order to improve the better combination between the variable speed sensing signal component and the mating shaft during use, and to better adjust the gap and prevent the occurrence of falling off, it is installed axially on the inner side of the plastic matrix. A circle of helical teeth, the helical teeth are integrally formed with the plastic matrix, so it has good toughness, and can automatically adjust the gap between the inner cavity of the plastic matrix and the mating shaft caused by the thermal expansion and contraction of the mating shaft. A little gap ensures that it will not fall off during use and has a long service life.

Description of drawings

Fig. 1 is a schematic top view of the present invention.

Fig. 2 is a schematic bottom view of the present invention.

Fig. 3 is a three-dimensional schematic diagram of the magnetic ring of the present invention.

Among them: 1-Plastic base, 2-Magnetic ring, 3-Anti-off pin, 4-Anti-off groove, 5-Anti-rotation pin, 6-Anti-rotation groove, 7-Helical teeth.

detailed description

In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment: Referring to a variable speed induction signal component shown in accompanying drawings 1-3, the component includes a plastic base 1 and a magnetic ring 2, the plastic base 1 is made of ABS resin material, and the magnetic ring 2 The central hole is a tapered structure with a narrow upper opening and a wider lower opening. A circle of anti-slip grooves 4 with equal intervals are arranged on the upper end surface of the magnetic ring 2. The plastic ring 2 is provided in the central hole of the magnetic ring 2. The base 1, the inner edge of the plastic base 1 is also provided with a ring of helical teeth 7 for gap adjustment, and the center of the helical teeth 7 forms a circular shaft hole.

Preferably, the inner diameter of the upper opening of the central hole of the magnetic ring 2 is 2-3mm smaller than the inner diameter of the lower opening, and a circle of anti-rotation grooves 6 is provided on the inner side of the lower end surface of the magnetic ring 2; each of the anti-rotation grooves 6 It is arranged at the middle position of the two anti-loosening grooves 4 , and the height of the anti-rotation groove 6 is lower than that of the magnetic ring 2 .

Preferably, the upper end surface of the plastic base 1 is integrally processed with anti-off pins 3 corresponding to the anti-off grooves 4 one by one. The side is also integrally processed with anti-rotation pins 5 corresponding to the anti-rotation grooves 6 one-to-one.

The present invention designs a tapered inner cavity structure of the magnetic ring 2, so that the magnetic ring 2 and the plastic base 1 are clamped together and injected with higher firmness, higher compactness, and are not easy to crack, and the general object has 6 degrees of freedom, respectively For up, down, left, right, front, and back, four anti-slip grooves 4 of the present invention are provided to realize the fixing of the front, back, left, and right sides, so that these surfaces have no degree of freedom and cannot rotate. And the upper and lower sides are realized by the designed tapered structure of the inner cavity of the magnetic ring 2. When knocking downwards like this, the clamping effect of the anti-off groove 4 cannot rotate. The structure is narrow and wide, so that no matter how much you hit the plastic base 1 in the middle, it will not slip off. The best fixing method is realized by limiting the 6 degrees of freedom of the object between the two, and the setting of the anti-rotation groove 6 is the right The plastic matrix 1 has an auxiliary anti-rotation function when there is a gap movement from bottom to top.

A processing technology for variable speed sensing signal components, comprising the following steps:

1) Screening of magnetic ring raw materials: Weigh qualified raw materials such as strontium ferrite, nylon 66, cumyl peroxide, and silane coupling agent, and pass them through 80, 100, and 120 mesh sieves according to the type for three times. Level screening, the particle size of raw materials after three-level screening is more uniform, and it is easier to mix materials;

2) Weighing: Weigh the sieved raw materials strontium ferrite, nylon 66, cumyl peroxide, and silane coupling agent according to the ratio of 88:9:1.2:1, and the ratio of raw materials It is the best ratio, and the existing rubber magnetic raw materials have poor fluidity during the preparation process, and the performance of the prepared rubber magnets is also relatively unstable, and the magnetic field distribution is also uneven, and the present invention uses a silane coupling agent to better It has a synergistic effect with several other raw materials, especially it can more effectively fuse magnetic powder and nylon, and improve the fluidity between raw materials;

3) primary mixing and stirring: the raw materials sieved in step (2) enter into the mixer for mixing in turn, and the stirring speed is 100-150r/min;

4) Drying: The mixture enters the dryer for drying. The drying temperature is 100-120°C. The temperature during the drying process starts from 0°C and gradually increases to 5°C per minute. 100-120 ℃, and keep warm and dry for 1-1.5 hours. During the drying process, the method of gradually increasing the temperature is used for drying, which can not only achieve a better drying effect and save energy, but also the method of gradually increasing the temperature will not cause Changes in the internal crystal structure of raw materials to ensure the original performance of raw materials;

5) Extrusion once: the mixed material enters the extruder for extrusion molding, and the material is extruded in a molten state, and the extrusion temperature is 250-270 °C; the feeding end of the extruder is provided with a preheating device, and the preheating device is set at Above the feeding funnel of the extruder, the heating element is installed inside for heating, and a temperature sensor is installed to control the heating temperature. , the purpose of using preheating is to ensure that the temperature of the dried mixture will not drop rapidly, as much as possible through the preheating device to keep the feed temperature of the mixture consistent with the temperature after drying, which can also save the mixture from entering The heating time of the extruder in the extruder improves the extrusion effect and efficiency;

6) Primary crushing: the extruded crude product is crushed once in the crusher, and after the crushing, the rare earth magnetic material analysis spectrometer is used for initial test inspection;

7) Secondary mixing and stirring: the crushed crude product particles enter the mixer for secondary mixing and stirring, and the stirring speed is 200-250r/min;

Physical properties of the secondary mixture: fluidity: 95g/10min, density: 3.65g/cm3, particle size: 1.5*1.5, moisture: 65ppm;

Magnetic properties of the secondary mixture: Br: 2400-2500GS; Hcb: 2250Oe; Hcj: 2750-2900Oe; (BH)max: 1.60MGOe;

8) Secondary extrusion: The secondary compound enters the extruder for secondary extrusion molding. The extrusion temperature is 250-270°C. During the secondary extrusion process, a preheating device is also installed at the feed port. Its structure , the effect is the same as extrusion once;

9) Secondary crushing: The semi-finished products formed by secondary extrusion are subjected to secondary crushing by the crusher, and after crushing, the rare earth magnetic material analysis spectrometer is used for secondary testing and inspection;

The present invention mainly passes through primary and secondary crushing, primary extrusion and secondary extrusion, and improves the injection molding quality of the magnetic ring 2 through a two-stage process, improves the stability of the magnetic poles, and improves the uniformity of raw material mixing of the magnetic ring 2 , because the density of the rough product is not uniform after one extrusion test, resulting in subsequent magnetic instability, and the amount of some granular magnetic powder is different, which will affect the processing quality of the magnetic ring 2;

10) Magnetic ring injection molding: The semi-finished granules that have been broken twice in step (9) are fed sequentially through the feed port of the molding machine, and a release slope of 2-3mm is placed on the mold. The setting of the inner cavity can produce a magnetic ring 2 with a narrow upper opening and a wider lower opening. The magnetic field orientation is also set in the mold. After the magnetic field orientation of the mold, a circle of magnetic ring 2 is injection molded; The ring 2 is dried in time, and the drying pipe is ventilated at the same time to take away the moisture in time. The drying temperature is 90-100 ° C. The upper end of the magnetic ring 2 is provided with a circle of anti-detachment grooves 4, and the inner surface of the lower end is A circle of anti-rotation groove 6 is set upward, and the inner cavity of the magnetic ring 2 processed in this step is a tapered structure;

11) Demagnetization and magnetization: The magnetic ring 2 after the magnetic field orientation is demagnetized first, and then magnetized in the customized magnetizing chuck to achieve the required magnetic pole purpose. The present invention first performs the magnetic ring 2 in the mold. Magnetic field orientation, after determining the N pole and S pole, demagnetize again, and then magnetize according to the needs under the guidance of N pole and S pole after demagnetization, so as to achieve better magnetic pole and more stable magnetic purpose. The number of magnetic poles in the present invention is 32;

12) Integral injection molding: after step (10) the magnetic ring 2 part is injected with anisotropic orientation of the mold, and then used as an insert for secondary injection molding of the plastic matrix 1 to wrap the tight part, the two pass through the anti-slip groove 4 designed in the middle and The two-way fixing of the anti-rotation groove 6, the two are firmly combined together, so as to achieve the effect of being used as a whole without being damaged. The inner edge of the plastic matrix is also integrally injection-molded with a circle of axial helical teeth, and ABS resin is used. The material is used as the material of the plastic matrix 1, which is injection-molded in a mold to obtain the plastic matrix 1. The upper end surface of the plastic matrix 1 is injection-moulded with a circle of anti-loosening pins 3, and the inner side of the lower end surface is injection-molded with a circle of anti-rotation pins 5 to prevent out-of-pins. 3 corresponds to the anti-off groove 4 of the magnetic ring 2, and the anti-rotation pin 5 corresponds to the anti-rotation groove 6 of the magnetic ring 2. During integral injection molding, the anti-off groove 4 cooperates with the anti-off pin 3 for integral injection molding, and the anti-rotation groove 6 cooperates with the anti-rotation The pin 5 is integrally injection molded.

ABS plastic features: good strength, stable binding force, and the physical stability of the product can still be maintained under the condition of high-speed rotating centrifugal force, but it does not have the ability to sense signals.

Based on the respective performance characteristics of the above two materials, the present invention proposes a variable speed sensing signal component. The internal connection is injection molded with ABS plastic base 1, and the helical teeth 7 are designed to adjust the degree of tightness, which can give full play to its advantages. The tolerance of the shaft can still be tightly wrapped on the matching shaft, and it will not fall off or burst due to the thermal expansion and contraction of the shaft. It is resistant to the damage of centrifugal force caused by high-speed rotation. The inductive signal magnetic ring 2 made of strong material.

Table 1: The magnetic field distribution diagram of the magnetic ring of the present invention.

Table 2: It is the numerical table of the magnetic performance, zero-cross point interval degree, and magnetic area in Table 1.

Table 3: It is the magnetic performance parameter table corresponding to each pole of the magnetic ring, where the N pole is positive and the S pole is negative.

It can be seen from Tables 1 to 3 that the magnetic ring made of the material of the present invention has uniform magnetic field distribution, stable magnetic performance and small error range.

Claims (10)

1. A variable speed induction signal component, characterized in that: the component comprises a plastic substrate and a magnetic ring, the central hole of the magnetic ring is a tapered structure with a narrow upper opening and a wide lower opening, and the upper end surface of the magnetic ring A ring of anti-off grooves with equal intervals is set on the top, the plastic base is provided in the central hole of the magnetic ring, and a circle of helical teeth for gap adjustment is also provided on the inner edge of the plastic base. The center forms a circular shaft hole. 2 . The variable speed sensing signal component according to claim 1 , wherein the inner diameter of the upper opening of the central hole of the magnetic ring is 2-3 mm smaller than the inner diameter of the lower opening. 3 . 3 . The variable speed induction signal component according to claim 1 , wherein a circle of anti-rotation grooves is provided on the inner side of the lower end surface of the magnetic ring. 4 . 4. A variable speed sensing signal component according to claim 3, characterized in that: each of the anti-rotation grooves is set at the middle position of the two anti-off grooves, and the height of the anti-rotation grooves is higher than the height of the anti-rotation grooves. The magnetic ring height is low. 5. A variable speed sensing signal component according to claim 4, characterized in that: the upper end surface of the plastic substrate is integrally processed with anti-off pins corresponding to the anti-loosening grooves one by one, and the anti-loosening grooves There are four, and anti-rotation pins corresponding to the anti-rotation grooves are integrally processed on the outer surface of the plastic matrix. 6. A variable speed sensing signal component according to any one of claims 1-5, wherein the plastic base is made of ABS resin material. 7. A processing technology for variable speed sensing signal components, characterized in that it comprises the following steps: 1) Screening of magnetic ring raw materials: Weigh qualified raw materials such as strontium ferrite, nylon 66, cumyl peroxide, and silane coupling agent, and pass them through 80, 100, and 120 mesh sieves according to the type for three times. level screening; 2) Weighing: Weigh the sieved raw materials of strontium ferrite, nylon 66, cumene peroxyneodecanoate, and silane coupling agent according to the ratio of 88:9:1.2:1, and set aside; 3) primary mixing and stirring: the raw materials sieved in step (2) enter into the mixer for mixing in turn, and the stirring speed is 100-150r/min; 4) Drying: The mixture enters the dryer for drying. The drying temperature is 100-120°C. The temperature during the drying process starts from 0°C and gradually increases to 5°C per minute. 100-120 ℃, and heat preservation and drying for 1-1.5 hours; 5) One-time extrusion: the mixed material enters the extruder for extrusion molding, and the material is extruded in a molten state, and the extrusion temperature is 250-270 °C; 6) Primary crushing: the extruded crude product is crushed once in the crusher, and after the crushing, the rare earth magnetic material analysis spectrometer is used for initial test inspection; 7) Secondary mixing and stirring: the crushed crude product particles enter the mixer for secondary mixing and stirring, and the stirring speed is 200-250r/min; 8) Secondary extrusion: the secondary compound enters the extruder for secondary extrusion molding, and the extrusion temperature is 250-270°C; 9) Secondary crushing: The semi-finished products formed by secondary extrusion are subjected to secondary crushing by the crusher, and after crushing, the rare earth magnetic material analysis spectrometer is used for secondary testing and inspection; 10) Magnetic ring injection molding: The semi-finished granules that have been crushed for the second time in step (9) are fed sequentially through the feed port of the molding machine. The mold is equipped with a release slope of 2-3 mm on one side, and a magnetic field is also set in the mold. Orientation, after the magnetic field orientation of the mold, a circle of magnetic ring is injection molded; there is a drying pipeline in the mold to dry the magnetic ring in time, and the drying pipeline is ventilated at the same time to take away the moisture in time. The drying temperature is 90 -100°C, the upper end of the magnetic ring is provided with a ring of anti-slip grooves, and the inner surface of the lower end is provided with a ring of anti-rotation grooves; 11) Demagnetization and magnetization: The magnetic ring after the orientation of the magnetic field is demagnetized first, and then magnetized in the customized magnetizing chuck to achieve the required magnetic pole purpose; 12) Integral injection molding: After the magnetic ring part in step (10) is injected with the anisotropic orientation of the mold, it is used as an insert for secondary injection molding of the plastic matrix wrapping part, and ABS resin material is selected as the material of the plastic matrix. The two-way fixing of the anti-loosening groove and anti-rotation groove designed in the middle. 8. The processing technology of a variable speed sensing signal component according to claim 7, characterized in that, both the step (5) "primary extrusion" and the step (8) "secondary extrusion" A preheating device is installed at the feed end of the extruder. 9. The processing technology of a variable speed induction signal component according to claim 8, wherein the preheating device is arranged above the feeding funnel of the extruder, and is heated by a built-in heating element , and a temperature sensor is set to control the heating temperature, the preheating device is sealed and connected with the feeding funnel, and a small stirrer is set in the preheating device. 10. The processing technology of a variable speed sensing signal component according to any one of claims 7-9, characterized in that, in the step (12) "integrated injection molding", the inner edge of the plastic matrix is along the There is also a circle of axial helical teeth formed by integral injection molding.