Hand-off alarm device based on capacitive sensing

Abstract

The utility model relates to safety monitoring technical field, concretely is hand and leaves alarm device based on electric capacity response, including installation base, two cross frames are symmetrically slidably installed in the installation base top, one mounting plate is slidably installed on the outer wall of the opposite side of two cross frames, one electric capacity board is installed on every mounting plate, two electric capacity boards are opposite. The utility model discloses two electric capacity boards of setting slidable adjustment, and the flexible adjustment of electric capacity board spacing and position is realized through cooperation first, second drive mechanism, and the versatility of device is improved. Multiple first infrared sensors are combined with electric capacity response, can realize multiple detection to human hand, can make electric capacity board follow along with the movement of hand at the same time, improve detection accuracy, control cabinet integrated control module and power amplifier cooperate with operating button and small power amplifier, realize the alarm function of device.

Description

Technical Field

[0001] This utility model relates to the field of safety monitoring technology, specifically to a hand-off alarm device based on capacitive sensing. Background Technology

[0002] In industrial production, equipment operation, and the use of precision instruments, whether the operator's hands are stably positioned in the critical operating area directly affects operational safety and work accuracy.

[0003] Traditional hand removal detection devices mostly use contact sensors or single sensing methods, which have many limitations: insufficient detection accuracy; single sensing methods (such as relying solely on mechanical contact or infrared sensing) are easily affected by environmental interference, often resulting in missed or false alarms when the hand moves slightly, the ambient light changes, or there are obstructions, making it impossible to accurately determine whether the hand has truly left the detection area; at the same time, they lack dynamic tracking capabilities. When the operator needs to move their hand slightly to adjust their posture during operation, traditional devices cannot adjust the detection range in real time, resulting in the inability to promptly identify the hand after it moves out of the initial detection area, posing a safety hazard.

[0004] In view of this, we propose a hand-off alarm device based on capacitive sensing. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a hand-off alarm device based on capacitive sensing.

[0006] The technical solution of this utility model is:

[0007] A capacitive sensing-based hand-off alarm device includes a mounting base. Two crossbeams are symmetrically slidably mounted on the top of the mounting base. A mounting plate is slidably mounted on the outer wall of each crossbeam on its opposite side. Each mounting plate has a capacitor plate mounted on it, with the two capacitor plates facing each other. A first drive mechanism is mounted on the mounting base to drive the two crossbeams to move towards or away from each other. A second drive mechanism is mounted on each crossbeam to drive the mounting plate to move. Several first infrared sensors are embedded in the outer wall of each crossbeam on its opposite side, and the infrared sensors are evenly spaced. The device also includes a control cabinet containing a control module and a high-power amplifier. The control cabinet has several operation buttons, and a small power amplifier is fixedly mounted on the top of each mounting plate. By setting two adjustable capacitor plates, and cooperating with the first and second drive mechanisms, the spacing and position of the capacitor plates can be flexibly adjusted, improving the versatility of the device; multiple first infrared sensors combined with capacitive sensing can realize multiple detections of human hands, and at the same time, the capacitor plates can follow the movement of the hand to improve detection accuracy. Meanwhile, the control cabinet integrates control modules and power amplifiers, and together with operation buttons and small power amplifiers, realizes the alarm function of the device.

[0008] As a preferred technical solution, a support leg is fixedly connected to each of the four corners of the bottom of the control cabinet. Two cabinet doors are symmetrically hinged to the front outer wall of the control cabinet near the bottom, and each cabinet door is equipped with a pull handle. The support legs can stably support the device and avoid moisture and wear problems caused by the control cabinet directly contacting the ground; the hinged cabinet doors and pull handles on the front side facilitate the inspection and maintenance of the internal components of the control cabinet.

[0009] As a preferred technical solution, a second infrared sensor is fixedly mounted on each of the mounting plates, with the two second infrared sensors facing each other. This adds an infrared detection layer to the capacitive sensing layer, allowing the infrared sensors to quickly respond and provide feedback signals when a hand enters or leaves between the capacitive plates.

[0010] As a preferred technical solution, each of the crossbeams has a first T-block integrally formed at the center of its bottom, and the mounting base has a first T-slot on its top, with the first T-block slidably connected to the first T-slot. This provides stable guidance for the movement of the crossbeams, ensuring that the crossbeams can move smoothly along a straight line under the drive of the first drive mechanism.

[0011] As a preferred technical solution, a second T-slot is provided on the crossbeam, and a second T-block is integrally formed on the outer wall of the mounting plate near the crossbeam, which is slidably connected to the second T-slot. This provides precise guidance for the movement of the mounting plate, enabling the mounting plate to be stably adjusted in position under the drive of the second drive mechanism.

[0012] As a preferred technical solution, the first driving mechanism includes a first lead screw rotatably mounted in the first T-slot. The first lead screw is divided into two parts with opposite thread directions in the middle. Two first T-blocks are respectively threaded to the two parts of the first lead screw with opposite thread directions. The first driving mechanism also includes a first adjusting motor fixed to the outer wall of the mounting base, with its output shaft coaxially fixed to the first lead screw. The first driving mechanism uses a bidirectional threaded first lead screw in conjunction with the first adjusting motor, enabling a single motor to drive the two crossbeams to move synchronously in opposite directions or in opposite directions.

[0013] As a preferred technical solution, the second driving mechanism includes a second lead screw rotatably mounted in the second T-slot, the second T-block being threadedly connected to the second lead screw, and a second adjusting motor fixed to one end of the crossbeam with its output shaft coaxially fixed to the second lead screw. The second driving mechanism, through the cooperation of the second lead screw and the second adjusting motor, can precisely drive the mounting plate to move along the crossbeam, achieving position adjustment of the capacitor plate in another dimension, allowing the capacitor plate to be flexibly adjusted to the optimal detection position according to actual detection needs.

[0014] As a preferred technical solution, the outer ring wall of the T-block fits tightly against the inner wall of the T-groove. This effectively eliminates the gap between them and prevents the T-block from wobbling or shifting when sliding within the T-groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention improves the versatility of the device by setting two adjustable capacitor plates and using first and second drive mechanisms to flexibly adjust the spacing and position of the capacitor plates. Multiple first infrared sensors combined with capacitive sensing enable multiple detections of the human hand, and the capacitor plates can follow the hand's movement to improve detection accuracy. The control cabinet integrates a control module and power amplifier, and together with operation buttons and a small power amplifier, it realizes the device's alarm function. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the mounting plate in this utility model;

[0019] Figure 3 In this utility model Figure 1 Enlarged view of point A in the image;

[0020] Figure 4 In this utility model Figure 1 Enlarged view of point B in the image;

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Mounting base; 10. First T-slot; 11. First lead screw; 12. First adjusting motor; 2. Crossbar; 20. First infrared sensor; 21. Second T-slot; 22. Second lead screw; 23. Second adjusting motor; 24. First T-block; 3. Mounting plate; 30. Capacitor board; 31. Second infrared sensor; 32. Second T-block; 4. Control cabinet; 40. High-power amplifier; 41. Operation buttons; 42. Cabinet door; 43. Support leg; 5. Low-power amplifier. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4This utility model provides a technical solution:

[0025] The hand-off alarm device based on capacitive sensing includes a mounting base 1. Two crossbeams 2 are symmetrically slidably mounted on the top of the mounting base 1. A mounting plate 3 is slidably mounted on the outer wall of each of the two crossbeams 2 on their opposite sides. A capacitor plate 30 is mounted on each mounting plate 3. The two capacitor plates 30 face each other. A first drive mechanism for driving the two crossbeams 2 to move towards each other or away from each other is mounted on the mounting base 1. A second drive mechanism for driving the mounting plate 3 to move is mounted on the crossbeams 2. Several first infrared sensors 20 are embedded on the outer wall of each of the two crossbeams 2 on their opposite sides. The infrared sensors are arranged at equal intervals. The device also includes a control cabinet 4. The control cabinet 4 contains a control module and a large power amplifier 40. The control cabinet 4 is equipped with several operation buttons 41. A small power amplifier 5 is fixedly mounted on the top of each mounting plate 3. By setting two adjustable capacitor plates 30, and cooperating with the first and second drive mechanisms, the spacing and position of the capacitor plates 30 can be flexibly adjusted, improving the versatility of the device; multiple first infrared sensors 20 combined with capacitive sensing can realize multiple detections of human hands, and at the same time, the capacitor plates 30 can follow the movement of the hand, improving detection accuracy. Meanwhile, the control cabinet 4 integrates the control module and power amplifier, and together with the operation button 41 and the small power amplifier 5, realizes the alarm function of the device.

[0026] In a preferred embodiment, a support leg 43 is fixedly connected to each of the four corners of the bottom of the control cabinet 4. Two cabinet doors 42 are symmetrically hinged to the front outer wall of the control cabinet 4 near the bottom, and each cabinet door 42 is equipped with a pull tab. The support legs 43 can stably support the device and avoid the control cabinet 4 from being in direct contact with the ground, thus preventing moisture and wear problems. The hinged cabinet doors 42 and pull tabs on the front side facilitate the inspection and maintenance of the internal components of the control cabinet 4.

[0027] As a preferred embodiment, each mounting plate 3 is fixedly mounted with a second infrared sensor 31, and the two second infrared sensors 31 face each other. This adds an infrared detection layer to the capacitive sensing layer, allowing the infrared sensors to quickly respond and provide feedback signals when a hand enters or leaves between the capacitive plates 30.

[0028] In a preferred embodiment, each crossbeam 2 has a first T-block 24 integrally formed at the bottom center, and the mounting base 1 has a first T-slot 10 on the top, with the first T-block 24 slidably connected to the first T-slot 10. This provides a stable guiding effect for the movement of the crossbeam 2, ensuring that the crossbeam 2 can move smoothly along a straight line under the drive of the first drive mechanism.

[0029] In a preferred embodiment, the crossbeam 2 has a second T-slot 21, and the mounting plate 3 has a second T-block 32 integrally formed on the outer wall near the crossbeam 2, which is slidably connected to the second T-slot 21. This provides precise guidance for the movement of the mounting plate 3, enabling the mounting plate 3 to be stably adjusted in position under the drive of the second drive mechanism.

[0030] In a preferred embodiment, the first driving mechanism includes a first lead screw 11 rotatably mounted within a first T-groove 10. The first lead screw 11 is divided into two parts with opposite thread directions in the middle. Two first T-blocks 24 are threadedly connected to the two parts of the first lead screw 11 with opposite thread directions, respectively. The first driving mechanism also includes a first adjusting motor 12 fixed to the outer wall of the mounting base 1, with its output shaft coaxially fixed to the first lead screw 11. The first driving mechanism, using a bidirectional threaded first lead screw 11 in conjunction with the first adjusting motor 12, can drive the two crossbeams 2 to move synchronously in opposite directions or in opposite directions via a single motor.

[0031] In a preferred embodiment, the second driving mechanism includes a second lead screw 22 rotatably mounted within the second T-slot 21, a second T-block 32 threadedly connected to the second lead screw 22, and a second adjusting motor 23 fixed to one end of the crossbar 2 with its output shaft coaxially fixed to the second lead screw 22. Through the cooperation of the second lead screw 22 and the second adjusting motor 23, the second driving mechanism can precisely drive the mounting plate 3 to move along the crossbar 2, thereby adjusting the position of the capacitor plate 30 in another dimension and allowing the capacitor plate 30 to be flexibly adjusted to the optimal detection position according to actual detection requirements.

[0032] In this preferred embodiment, the outer ring wall of the T-block fits tightly against the inner wall of the T-groove. This effectively eliminates the gap between them and prevents the T-block from wobbling or shifting when sliding within the T-groove.

[0033] In use, the hand-off alarm device based on capacitive sensing of this utility model is initially set via the operation button 41 on the control cabinet 4. The control module activates the first and second drive mechanisms according to the set instructions to adjust the spacing and position of the two capacitor plates 30. The first adjusting motor 12 drives the first lead screw 11 to rotate, and uses the bidirectional thread characteristic to drive the two crossbars 2 to move synchronously towards or away from each other along the first T-slot 10 through the first T-block 24, thereby adjusting the spacing of the capacitor plates 30. The second adjusting motor 23 drives the second lead screw 22 to rotate, and drives the mounting plate 3 to move along the second T-slot 21 through the second T-block 32, thereby adjusting the position of the capacitor plates 30 in another dimension, so that the two capacitor plates 30 are facing each other and in an initial state suitable for detection.

[0034] When a hand enters between the two capacitor plates 30, the human body, acting as a high-dielectric-constant medium, changes the capacitance between the capacitor plates 30. The control module monitors the capacitance change in real time and records the baseline state. Simultaneously, several first infrared sensors 20 on the crossbeam 2 and second infrared sensors 31 on the mounting plate 3 work together. The first infrared sensors 20 detect the approximate position of the hand, and the second infrared sensors 31 accurately sense whether the hand is within the detection area of ​​the capacitor plates 30. Multiple signals are fed back to the control module to confirm the presence of the hand.

[0035] During use, if the hand moves, the first infrared sensor 20 can capture the position change in real time. The control module drives the second drive mechanism according to the change signal, so that the capacitor plate 30 follows the hand's movement through the sliding of the crossbeam 2 and the mounting plate 3, always maintaining the optimal detection state. When the hand leaves the detection area of ​​the capacitor plate 30, the capacitance value changes significantly, and the infrared sensor reports no hand signal. The control module determines that the hand is out of contact and immediately triggers the alarm mechanism: it controls the large power amplifier 40 and the small power amplifier 5 to work, and issues an alarm prompt through sound and other means to remind the user.

[0036] Throughout the process, the tight fit between the T-block and the T-slot ensures the smooth and precise movement of each component. The design of the support legs 43 and cabinet door 42 of the control cabinet 4 ensures the stable operation and convenient maintenance of the equipment, thereby achieving accurate and reliable detection and alarm of the hand leaving the device.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hand-off alarm device based on capacitive sensing, characterized in that: The system includes a mounting base (1), on which two crossbeams (2) are symmetrically slidably mounted. Each of the two crossbeams (2) has a mounting plate (3) slidably mounted on its opposite outer wall. Each mounting plate (3) has a capacitor plate (30) mounted on it. The two capacitor plates (30) face each other. The mounting base (1) is equipped with a first drive mechanism for driving the two crossbeams (2) to move towards each other or away from each other. The crossbeams (2) are equipped with a second drive mechanism for driving the mounting plate (3) to move. Each of the two crossbeams (2) has a number of first infrared sensors (20) embedded on its opposite outer wall. The infrared sensors are arranged at equal intervals. The system also includes a control cabinet (4), which contains a control module and a large power amplifier (40). The control cabinet (4) has a number of operation buttons (41). Each mounting plate (3) has a small power amplifier (5) fixedly mounted on its top.

2. The hand-off alarm device based on capacitive sensing as described in claim 1, characterized in that: The control cabinet (4) has a support leg (43) fixedly connected at each of the four corners of the bottom. The control cabinet (4) has two cabinet doors (42) symmetrically hinged near the bottom on the front outer wall. Each cabinet door (42) has a pull head installed on it.

3. The hand-off alarm device based on capacitive sensing as described in claim 2, characterized in that: Each of the mounting plates (3) is fixedly mounted with a second infrared sensor (31), and the two second infrared sensors (31) face each other.

4. The hand-off alarm device based on capacitive sensing as described in claim 3, characterized in that: Each of the crossbars (2) has a first T-shaped block (24) integrally formed at the bottom center, and the mounting base (1) has a first T-shaped groove (10) on the top, and the first T-shaped block (24) is slidably connected to the first T-shaped groove (10).

5. The hand-off alarm device based on capacitive sensing as described in claim 4, characterized in that: The crossbar (2) has a second T-slot (21), and the mounting plate (3) has a second T-block (32) integrally formed on the outer wall of the side near the crossbar (2) that is slidably connected to the second T-slot (21).

6. The hand-off alarm device based on capacitive sensing as described in claim 5, characterized in that: The first drive mechanism includes a first lead screw (11) rotatably installed in the first T-groove (10). The first lead screw (11) is divided into two parts with opposite thread directions in the middle. Two first T-blocks (24) are threadedly connected to the two parts with opposite thread directions of the first lead screw (11). The first drive mechanism also includes a first adjusting motor (12) fixed on the outer wall of the mounting base (1) and whose output shaft is coaxially fixed with the first lead screw (11).

7. The hand-off alarm device based on capacitive sensing as described in claim 6, characterized in that: The second drive mechanism includes a second lead screw (22) rotatably installed in the second T-slot (21), the second T-block (32) being threadedly connected to the second lead screw (22), and the second drive mechanism also includes a second adjusting motor (23) fixed at one end of the cross frame (2) and whose output shaft is coaxially fixed with the second lead screw (22).

8. The hand-off alarm device based on capacitive sensing as described in claim 7, characterized in that: The outer ring wall of the T-block fits tightly against the inner wall of the T-groove.

Images