CN210982516U - Induction type protection safety device and multifunctional digital multimeter - Google Patents

Abstract

The utility model is suitable for the technical field of electronic measuring tools, and provides an inductive protective safety device and a multifunctional digital multimeter. The inductive protective safety device of the utility model comprises a casing with a charging hole for inserting a charging cable, a protective cover which is covered on the charging hole and is movable and exposes the charging hole, and a sensor arranged inside the casing. It is used to detect whether the protective cover is placed on the charging hole, and the above inductive protective safety device is applied to the digital multimeter. The digital multimeter can give a prompt whether the protective cover is placed on the charging hole, avoiding the digital multimeter It can be used while charging, thus preventing the operator from electric shock and damage to the DMM. The digital multi-meter of the utility model includes the above-mentioned inductive protective safety device, which can prevent the operator from getting electric shock and damaging the digital multi-meter.

Description

An inductive protective safety device and a multifunctional digital multimeter

technical field

The utility model relates to the technical field of electronic measuring tools, in particular to an inductive protective safety device and a multifunctional digital multimeter.

Background technique

Digital multimeter is an electronic instrument used in electrical measurement. It can have many special functions, but the main function is to measure voltage, resistance and current. Digital multimeter, as a modern multi-purpose electronic measuring instrument, mainly uses In the fields of physics, electricity, electronics and other measurement.

Existing digital multimeters are equipped with rechargeable batteries, and generally use external charging, that is, take out the rechargeable battery and charge the rechargeable battery separately. The charging operation is more complicated, so a digital multimeter that does not require external charging is extended. Multimeter. The digital multimeter cannot be measured during online charging. On the one hand, the use of the digital multimeter during charging may easily cause electric shocks to the staff. On the other hand, the use of the digital multimeter during charging may easily lead to a short circuit of the digital multimeter and cause damage to the digital multimeter. In order to avoid the above situation, the prior art is to add a baffle covering the charging interface of the digital multimeter. When charging, the baffle needs to be opened to expose the charging interface, and the baffle will move to the terminal hole after the baffle is opened. , the above method can prevent the digital multi-meter from being used while charging.

However, when the baffle is damaged and separated from the digital multimeter, the charging interface and terminal holes are exposed, and the digital multimeter can be used while charging. When the operator misuses it, it is easy to cause electric shock and damage to the digital multimeter. Hazard occurs.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide an inductive protective safety device, which aims to solve the technical problem that the existing digital multi-meter is easy to cause electric shock to the operator and the hidden danger of damaging the digital multi-meter.

The utility model is realized in this way, an inductive protective safety device, comprising a casing with a charging hole for inserting a charging cable, a protective cover covering the charging hole and being movable and exposing the charging hole , and a sensor arranged inside the casing, the sensor is used to detect whether the protective cover is arranged on the charging hole.

Further, the inductive protective safety device further includes a permanent magnet arranged on the protective cover and corresponding to a sensor, and the sensor is a Hall sensor.

Further, the permanent magnet is embedded on a side surface of the protective cover close to the charging hole.

Further, the permanent magnet and the protective cover are integrally formed.

Further, the inductive protective safety device further includes a circuit board provided in the housing, and the Hall sensor is welded on the circuit board.

Further, the inductive protective safety device further includes a display panel electrically connected to the circuit board.

Further, the protective cover is rotatably connected with the housing.

Further, two ends of the protective cover are respectively provided with rotating shafts, two sides of the housing are respectively provided with shaft holes corresponding to the rotating shafts, and each of the rotating shafts is pivotally connected to the corresponding shaft holes.

Further, a terminal hole for insertion of test pens is provided on the housing at a position close to the charging hole, and the protective cover can be moved to the terminal hole after being lifted from the charging hole.

Another object of the present invention is to provide a multifunctional digital multimeter, including the above-mentioned inductive protective safety device.

The inductive protective safety device provided by the utility model comprises a casing with a charging hole for inserting a charging cable, a protective cover which is arranged on the charging hole and is movable and exposes the charging hole, and a sensor arranged inside the casing , the sensor is used to detect whether the cover is placed on the charging hole, and the above-mentioned inductive protective safety device is applied to the digital multimeter. The use of the meter occurs while charging, thereby preventing the operator from electric shock and damage to the DMM. The digital multi-meter provided by the utility model includes the above-mentioned inductive protective safety device, which can prevent the operator from getting electric shock and damaging the digital multi-meter.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present utility model. For some new embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of an exploded structure of an inductive protective safety device provided by an embodiment of the present invention;

2 is a schematic structural diagram of a test pen provided by an embodiment of the present invention when it is inserted into an inductive protective safety device;

3 is a schematic structural diagram of a charging cable provided by an embodiment of the present invention when it is inserted into an inductive protective safety device;

4 is a schematic cross-sectional structural diagram of the inductive protective safety device provided by the embodiment of the present invention under the measurement state;

5 is a schematic cross-sectional structural diagram of the inductive protective safety device provided by an embodiment of the present invention in a charging state.

Among them, each reference sign in the figure:

1-case; 11-case;

111-charging hole; 112-terminal hole;

113-shaft hole; 12-bottom shell;

2-protective cover; 21-accommodating slot;

22-support plate; 23-rotating shaft;

3-permanent magnet; 4-sensor;

5- circuit board; 51- charging socket;

6-battery; 7-display panel;

8-Charging cable; 9-Table pen.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description, rather than indicating or implying the referred device Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of this patent. The terms "first" and "second" are only used for the purpose of description, and should not be understood as indicating or implying relative importance or implying indicating the number of technical features. "Plurality" means two or more, unless expressly specifically limited otherwise.

In order to illustrate the technical solutions of the present invention, the following detailed description is given in conjunction with the specific drawings and embodiments.

Referring to FIG. 1 , an embodiment of the present invention provides an inductive protective safety device, including a housing 1 with a charging hole 111 for inserting a charging cable 8 , a cover on the charging hole 111 and movably exposing the charging hole 111 The protective cover 2 , and the sensor 4 provided inside the housing 1 , the sensor 4 is used to detect whether the protective cover 2 is placed on the charging hole 111 . The inductive protective safety device of the embodiment of the present invention includes a housing 1 with a charging hole 111 for inserting the charging cable 8 , a protective cover 2 covering the charging hole 111 and movably exposing the charging hole 111 , and The sensor 4 inside the housing 1, the sensor 4 is used to detect whether the protective cover 2 is covered on the charging hole 111, and the above-mentioned inductive protective safety device is applied to the digital multimeter, and the digital multimeter can tell whether the protective cover 2 is covered or not. The prompt set on the charging hole 111 avoids the situation that the digital multi-meter is used while being charged, thereby preventing the operator from getting electric shock and damaging the digital multi-meter.

Optionally, the inductive protective safety device of the embodiment corresponding to FIG. 1 also includes a permanent magnet 3 disposed on the protective cover 2 and corresponding to the sensor 3. Correspondingly, the sensor 3 used in this embodiment is specifically a Hall sensor, The model of the Hall sensor is A3121/IA5161T. According to the selection of the actual situation, the permanent magnet 3 and the sensor 3 may also be other combinations, which are not limited in the present invention.

In this embodiment, referring to FIG. 1 , FIG. 4 and FIG. 5 , when the protective cover 2 is lifted to expose the charging hole 111 , the permanent magnet 3 on the protective cover 2 is separated from the sensing range of the sensor 4 , so that the sensor 4 can pass the induction The permanent magnet 3 is used to detect whether the protective cover 2 is placed on the charging hole 111, and the above-mentioned inductive protective safety device is applied to the digital multimeter. The digital multimeter can give a prompt whether the protective cover 2 is placed on the charging hole 111. , to avoid the situation of using the digital multimeter while charging, thereby preventing the operator from electric shock and damage to the digital multimeter.

In an embodiment of the present invention, referring to FIGS. 1 , 4 and 5 , the permanent magnet 3 is provided on the side surface of the protective cover 2 close to the casing 1 , and the permanent magnet 3 can also be selected according to the actual situation. It is arranged on the side surface of the protective cover 2 away from the casing 1 , which is not limited in the present invention.

As a preferred embodiment of the present invention, the permanent magnet 3 is embedded on the side surface of the protective cover 2 close to the casing 1 . Embedded in the accommodating groove 21 . It can be understood that, the permanent magnet 3 can also be completely embedded in the accommodating groove 21 according to the selection of the actual situation, which is not limited in the present invention.

Optionally, the permanent magnet 3 and the protective cover 2 are integrally formed into a product. In this embodiment, the manufacturing method of the protective cover 2 is as follows: a mold for the protective cover 2 is provided, and the permanent magnet 3 is placed in the corresponding accommodating groove in the mold. At the position of 21, the molten material is filled into the mold, and then cooled and demolded to obtain the protective cover 2 and the permanent magnet 3 provided on the protective cover 2. Since the permanent magnet 3 and the protective cover 2 are integrally formed, there is no need for additional protection. The step of assembling the permanent magnet 3 on the cover 2 effectively simplifies the production cost.

Optionally, after the protective cover 2 is fabricated, the permanent magnets 3 may be assembled on the protective cover 2 . In this embodiment, the permanent magnets 3 may be in interference fit with the accommodating grooves 21 , so that the permanent magnets 3 are arranged on the protective cover 2 . It can be understood that, the permanent magnet 3 can also be provided on the accommodating groove 21 by but not limited to by gluing according to the actual selection, which is not limited in the present invention.

In one embodiment of the present invention, the permanent magnets 3 are arranged inside the protective cover 2. In this embodiment, the permanent magnets 3 and the protective cover 2 are integrally formed into a piece, and the manufacturing method of the protective cover 2 is as follows: providing a protective cover 2 mold, the permanent magnet 3 is placed in the mold, the molten material is filled into the mold, and then the mold is cooled and demolded to obtain the protective cover 2 wrapped outside the permanent magnet 3. Since the permanent magnet 3 and the protective cover 2 are integrally formed, so There is no need for an additional step of assembling the permanent magnet 3 on the protective cover 2, which effectively simplifies the production cost.

In an embodiment of the present invention, referring to FIGS. 1 to 3 , a terminal hole 112 for inserting the test leads 9 is provided on the housing 1 at a position adjacent to the charging hole 111 , and the protective cover 2 can be opened from the charging hole 111 . Move it to the terminal hole 112 to block the insertion of the test lead 9, thereby avoiding the situation that the test lead 9 and the charging cable 8 are simultaneously inserted into the multi-function digital multimeter, and effectively avoid the occurrence of electric shock and damage to the digital multi-meter by the operator.

In an embodiment of the present invention, the protective cover 2 is rotatably connected with the housing 1 . In this embodiment, both ends of the protective cover 2 extend toward the casing 1 to form support plates 22, each of which is provided with a rotating shaft 23, and two sides of the casing 1 are respectively provided with shaft holes 113 corresponding to the rotating shafts 23, Each rotating shaft 23 is pivotally connected to the corresponding shaft hole 113 , so as to realize the rotational connection between the protective cover 2 and the housing 1 .

In one embodiment of the present invention, the inductive protective safety device includes a circuit board 5 disposed inside the casing 1, a battery 6 disposed inside the casing 1 and electrically connected to the circuit board 5, and the corresponding charging hole 111 is disposed in the The charging socket 51 on the circuit board 5 and the display panel 7 electrically connected to the circuit board 5, wherein the battery 6 is used to supply power to the circuit board 5, and the circuit board 5 is provided with a main control chip (not shown), the main control chip , the charging socket 51 and the Hall sensor are respectively welded on the circuit board 5 , and the main control chip is electrically connected to the Hall sensor, the battery 6 , the charging socket 51 and the display panel 7 respectively through the circuit board 5 . In this embodiment, the main control chip is a single-chip microcomputer, and the specific model may be, but not limited to, STC89C52, which is not limited in the present invention.

It should be noted that, when the inductive protective safety device of the embodiment of the present invention is applied to the multi-function digital multimeter, when the battery 6 needs to be charged, with reference to Figs. 2 to expose the charging hole 111, the permanent magnet 3 on the cover 2 moves out of the sensing range of the Hall sensor, the Hall sensor will output a high level or a low level to notify the main control chip, the main control chip receives the information and controls The display panel 7 displays a warning message. At this time, the multi-function digital multimeter is in the charging mode and cannot perform measurement. The charging cable 8 passes through the charging hole 111 and is inserted into the charging socket 51 to charge the battery 6 . When measurement is required, pull out the charging cable 8 and close the cover 2 to hide the charging hole 111. At this time, the permanent magnet 3 on the cover 2 enters the sensing range of the Hall sensor, and the Hall sensor will output a low power The main control chip receives the information and controls the display panel 7 to display the measurement data. At this time, the multi-function digital multimeter is in the measurement mode and cannot be charged. Insert the test lead 9 into the terminal hole 112. to measure. When the protective cover 2 is damaged and separated from the housing 1, the permanent magnet 3 on the protective cover 2 moves out of the sensing range of the Hall sensor, and the Hall sensor will output a high level or a low level to notify the main control chip, and the main control chip receives To the information and control the display panel 7 to display a warning, at this time, the multi-function digital multimeter cannot perform measurement, which greatly improves the use safety of the multi-function digital multimeter and avoids the safety risk of the operator.

In an embodiment of the present invention, the case 1 includes a bottom case 12 and a watch case 11 connected to the bottom case 12 , wherein the bottom case 12 and the watch case 11 can be but not limited to be together by means of snap connection, A closed space for loading the above components is formed between the bottom case 12 and the watch case 11 . It can be understood that, in this embodiment, the terminal hole 112 , the charging hole 111 and the shaft hole 113 are arranged on the watch case 11 at intervals, and the positions of the terminal hole 112 , the charging hole 111 and the shaft hole 113 can be selected according to the actual situation. Appropriate adjustments are made, and the present invention is not limited here.

The embodiment of the present invention also provides a multi-function digital multimeter, which includes the above-mentioned inductive protective safety device, and a detection unit (not shown) disposed in the housing 1 and electrically connected to the circuit board 5 , wherein, The detection unit is used to detect voltage, current and resistance. Since the multifunctional digital multimeter of the embodiment of the present invention includes the above-mentioned inductive protective safety device, it also has all the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be repeated here.

The above are only optional embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (10)

1. The utility model provides an induction type protection safety device, its characterized in that establishes including offering the casing, the lid that supply charging wire male hole of charging on charging the hole and portable and expose the protecting cover in hole of charging, and locate the inside sensor of casing, the sensor is used for detecting whether the protecting cover is covered and is established on the hole of charging.

2. The inductive safety device of claim 1, further comprising a permanent magnet disposed on the shield and positioned in relation to the sensor, wherein the sensor is a hall sensor.

3. The induction-type safety device of claim 2, wherein the permanent magnet is embedded in a surface of the cover on a side thereof adjacent to the charging hole.

4. The induction safety device of claim 2, wherein said permanent magnet and said cover are integrally formed.

5. The inductive safety device of claim 2, further comprising a circuit board disposed within the housing, wherein the hall sensor is soldered to the circuit board.

6. The inductive secure device of claim 5, further comprising a display panel electrically connected to the circuit board.

7. An induction safety device according to any one of claims 1 to 6, wherein said cover is pivotally connected to said housing.

8. The device as claimed in claim 7, wherein the protecting cover has two ends respectively provided with a rotating shaft, two sides of the housing respectively provided with a shaft hole corresponding to the rotating shaft, and each rotating shaft is pivotally connected to the corresponding shaft hole.

9. The device as claimed in any one of claims 1 to 6, wherein the housing is provided with a terminal hole for inserting a pen-shape meter at a position close to the charging hole, and the cover is lifted from the charging hole and then moved to the terminal hole.

10. A multi-function digital multimeter comprising the inductive guard safety device of any one of claims 1 to 9.

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