Built-in magnet detection device for plastic part

Abstract

The utility model discloses a plastic part built-in magnet detection device, which comprises a mounting plate, a plurality of groups of single-pole Hall switch elements are arranged on the mounting plate, and the distribution positions of the plurality of groups of single-pole Hall switch elements on the mounting plate correspond to the positions where magnets should be embedded in a plastic part. The sensing surface of each single-pole Hall switch element is used for sensing the surface, deviating from the internal core hardware of the household electrical appliance, of the magnet embedded in the plastic part, the output ends of each group of single-pole Hall switch elements are respectively connected with each input end of an OR gate circuit, and the output end of the OR gate circuit is connected with the input end of an alarm circuit. According to the invention, whether the plastic housing of the household electrical appliance has a problem of neglected installation of the magnet and a problem of reverse installation of the polarity of the magnet can be detected and judged, and technical support is provided for factory detection of the household electrical appliance.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliance product detection, in particular to a plastic part built-in magnet detection device. Background Art

[0002] Magnets are often embedded in the plastic shell of home appliances. Sometimes during the production process, employees may miss a magnet or install it with the polarity reversed, and the staff cannot detect it, which causes the home appliance to malfunction. Utility Model Content

[0003] The utility model aims to provide a device for detecting built-in magnets in plastic parts, which is used to detect whether a magnet is missing from a plastic shell of a home appliance product or the polarity of the magnet is installed in reverse, thereby providing assistance for factory inspection of the home appliance product.

[0004] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0005] A device for detecting magnets built into plastic parts, characterized in that it includes a mounting plate, on which are arranged several groups of unipolar Hall switch elements, the distribution positions of the several groups of unipolar Hall switch elements on the mounting plate correspond to the positions in the plastic parts where magnets should be embedded, the sensing surface of each unipolar Hall switch element is used to sense the surface of the magnet embedded in the plastic part that is away from the core hardware inside the home appliance product, the output end of each group of unipolar Hall switch elements is respectively connected to each input end of an OR gate circuit, the output end of the OR gate circuit is connected to the input end of an alarm circuit, and the alarm circuit activates an alarm through the alarm circuit when any group of unipolar Hall switch elements outputs a high level.

[0006] Preferably, the OR gate circuit comprises diodes having the same number as the single-pole Hall switch elements, the output end of each single-pole Hall element is connected to the anode of a diode, and the cathode of the diode is connected to the input end of the alarm circuit.

[0007] Preferably, the OR gate circuit further comprises a first resistor, a first end of the first resistor is connected to the cathode of each diode, and a second end of the first resistor is connected to the input end of the alarm circuit.

[0008] Preferably, the alarm circuit includes a first transistor, a second transistor, a second resistor, a third resistor and a light emitting diode LED, the base of the first transistor is connected to the output end of the OR gate circuit, the collector of the first transistor is respectively connected to the base of the second transistor and the first end of the second resistor, the second end of the second resistor is connected to the power supply end, the emitter of the first transistor is grounded, the collector of the second transistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the cathode of the light emitting diode LED, the anode of the light emitting diode LED is connected to the power supply end, and the emitter of the second transistor is grounded.

[0009] Preferably, a sound alarm is connected between the anode of the light emitting diode and the collector of the second transistor.

[0010] The beneficial effects of the above technical solution are as follows: the present application sets up a mounting plate, and sets up several groups of unipolar Hall switch elements on the mounting plate, and the distribution positions of the several groups of unipolar Hall switch elements on the mounting plate correspond to the positions of the magnets embedded in the plastic parts. The unipolar Hall switch elements, the OR gate circuit connected to the Hall switch elements, and the alarm circuit are used to detect and determine whether there is a problem of missing magnets in the plastic casing of household appliances and the problem of reverse installation of the polarity of the magnets, thereby providing technical support for factory inspection of household appliances.

[0011] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a flow chart of the silicon rod bonding method of the prior art;

[0013] Figure 2 The utility model is a flow chart of the silicon rod bonding method. DETAILED DESCRIPTION

[0014] like Figure 1 and 2 As shown, a device for detecting magnets built into plastic parts comprises a mounting plate 1, on which a plurality of groups of unipolar Hall switch elements 2 are arranged, and the distribution positions of the plurality of groups of unipolar Hall switch elements 2 on the mounting plate 1 correspond to the positions where magnets 4 should be embedded in the plastic part 3, and the sensing surface of each unipolar Hall switch element 2 is used to sense the surface of the magnet 4 embedded in the plastic part 3 that is away from the core hardware inside the home appliance product, so that when the unipolar Hall switch element is close to the position where the magnet is installed in the plastic part, if the magnet is missing or the polarity of the magnet is installed in reverse, the unipolar Hall switch element will output a high level, otherwise it will output a low level, and the output end of each group of unipolar Hall switch elements 2 is respectively connected to each input end of an OR gate circuit, and the output end of the OR gate circuit is connected to the input end of the alarm circuit, and the alarm circuit opens the alarm through the alarm circuit when any group of unipolar Hall switch elements outputs a high level, and the alarm circuit cannot be turned on when the output is a low level, and no alarm is given. In addition, the overall batch magnet detection can be performed by holding the mounting plate to improve the detection efficiency.

[0015] In some embodiments, the OR gate circuit includes the same number of diodes as the single-pole Hall switch elements. If there are n single-pole Hall switch elements, then the number of diodes is also n, namely D1-Dn. The output end of each single-pole Hall element is connected to the anode of a diode, and the cathode of the diode is connected to the input end of the alarm circuit.

[0016] In some embodiments, the OR gate circuit further includes a first resistor R1, a first end of the first resistor R1 is connected to the cathode of each diode, a second end of the first resistor R1 is connected to the input end of the alarm circuit, and current is limited by the first resistor R1.

[0017] In some embodiments, the alarm circuit includes a first transistor Q1, a second transistor Q2, a second resistor R2, a third resistor R3 and a light emitting diode LED, the base of the first transistor Q1 is connected to the output end of the OR gate circuit, the collector of the first transistor Q1 is connected to the base of the second transistor Q2 and the first end of the second resistor R2 respectively, the second end of the second resistor R2 is connected to the power supply end, the emitter of the first transistor Q1 is grounded, the collector of the second transistor Q2 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the cathode of the light emitting diode LED, the anode of the light emitting diode LED is connected to the power supply end, and the emitter of the second transistor is grounded. When any unipolar Hall element does not detect the magnet or the installation polarity of the magnet does not meet the requirements, the unipolar Hall element outputs a high level, the first transistor Q1 and the second transistor Q2 are turned on, and the light emitting diode LED alarms.

[0018] In some embodiments, an alarm bell BUZ1 or a buzzer is connected between the anode of the light emitting diode LED and the collector of the second transistor Q2, so that a sound alarm can be given at the same time as a light alarm.

[0019] In this embodiment, a mounting plate is provided, and several groups of unipolar Hall switch elements are provided on the mounting plate. The distribution positions of the several groups of unipolar Hall switch elements on the mounting plate correspond to the positions of the magnets embedded in the plastic part. The unipolar Hall switch elements, the OR gate circuit connected to the Hall switch elements, and the alarm circuit are used to detect and determine whether there is a problem of missing magnets in the plastic shell of the home appliance product and a problem of reverse installation of the magnet polarity, thereby providing technical support for factory inspection of home appliances.

[0020] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A device for detecting a magnet built into a plastic part, characterized in that: The invention comprises a mounting plate, on which are arranged several groups of unipolar Hall switch elements, the distribution positions of the several groups of unipolar Hall switch elements on the mounting plate correspond to the positions where magnets should be embedded in the plastic part, the sensing surface of each unipolar Hall switch element is used to sense the surface of the magnet embedded in the plastic part which faces away from the core hardware inside the household appliance product, the output end of each group of unipolar Hall switch elements is respectively connected to each input end of an OR gate circuit, the output end of the OR gate circuit is connected to the input end of the alarm circuit, and the alarm circuit activates an alarm through the alarm circuit when any group of unipolar Hall switch elements outputs a high level.

2. The detection device according to claim 1, characterized in that: The OR gate circuit includes diodes having the same number as the single-pole Hall switch elements. The output end of each single-pole Hall element is connected to the anode of a diode, and the cathode of the diode is connected to the input end of the alarm circuit.

3. The detection device according to claim 2, characterized in that The OR gate circuit further comprises a first resistor, a first end of the first resistor is connected to the cathode of each diode, and a second end of the first resistor is connected to the input end of the alarm circuit.

4. The detection device according to claim 1, characterized in that: The alarm circuit includes a first transistor, a second transistor, a second resistor, a third resistor and a light emitting diode (LED). The base of the first transistor is connected to the output end of the OR gate circuit, the collector of the first transistor is respectively connected to the base of the second transistor and the first end of the second resistor, the second end of the second resistor is connected to the power supply end, the emitter of the first transistor is grounded, the collector of the second transistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the cathode of the light emitting diode (LED), the anode of the light emitting diode (LED) is connected to the power supply end, and the emitter of the second transistor is grounded.

5. The detection device according to claim 4, characterized in that: A sound alarm is connected between the anode of the light emitting diode and the collector of the second triode.

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