A protection device for a portable detector

Abstract

The application relates to a protection device of a portable detector, and belongs to the technical field of safety detection. The protection device comprises a detector main body, a protection device, a driving device and a control unit. The detector main body is internally provided with four groups of array-arranged sensors provided with air inlets. The roller shutter of the protection device is made of air-tight flexible material and is provided with a waterproof and dustproof sealing layer on the surface and is arranged in a half-enclosing mode above and below the sensors. The micro motor of the driving device is connected with the driving wheel through a conveying belt, and the roller shutter is wound on the driving wheel. The control unit is electrically connected with the main controller of the detector main body, and is further provided with a groove-shaped photoelectric switch electrically connected with the control unit. The outer side of the sensor is provided with a cover with air holes and a steel mesh. The application has the effect that the roller shutter can be controlled to move according to the start-up or shutdown instruction of the detector, the air inlet of the sensor is shielded or opened, the sensor is effectively protected when the instrument is not used, and the sensor is prevented from being affected by impurities such as dust and water vapor.

Description

Technical Field

[0001] This application relates to the technical field of security detection, and in particular to a protective device for a portable detector. Background Technology

[0002] Currently, portable detectors generally detect multiple gases simultaneously. The most common type is the four-in-one detector, which requires the installation of four gas sensors. These typically include combustible gas sensors, oxygen sensors, and toxic gas sensors, such as carbon monoxide sensors, hydrogen sulfide sensors, and sulfur dioxide sensors. The specific type of sensor used depends on the application scenario of the detector.

[0003] Different sensors operate on different principles and have varying technical characteristics. Because the gas sensors in a detector must be exposed to air, impurities or interfering gases in the air can enter the sensor when the instrument is not in use, affecting its performance or lifespan. This leads to frequent calibrations and increases the workload during use.

[0004] Currently, the conventional protective measure is to place the detector in a protective case or box. For wearable detectors, this requires removing them from the body and putting them back in the case each time, which is inconvenient. Even worse, if the protective case or box is lost, the detector loses its protective function. Therefore, there is a need for a detector with built-in protective capabilities. Utility Model Content

[0005] In order to protect the detector and facilitate its use, this application provides a protective device for a portable detector.

[0006] The protective device for a portable detector provided in this application adopts the following technical solution: A protective device for a portable detector includes a detector body, a protective device, a drive device, and a control unit. The detector body houses four arrayed sensors. The protective device includes a roller shutter made of an airtight flexible material and multiple positioning shafts for limiting the roller shutter's movement trajectory. The roller shutter is semi-enclosed above and below the four sensors, and its coverage width is adapted to the air inlet area of ​​the four sensors. The drive device includes a micro motor and a drive wheel. The micro motor is fixed inside the detector body and connected to the drive wheel, which drives the drive wheel to rotate. The drive wheel is located on the sides of the four sensors. Both ends of the roller shutter are fixed to the drive wheel and wound in opposite directions. The control unit is electrically connected to the main controller of the detector body to respond to power-on or power-off commands from the detector body.

[0007] By adopting the above technical solution, four arrayed sensors are set inside the main body of the detector. A roller shutter made of airtight flexible material is set above and below the sensors in a semi-enclosed shape, and the coverage width of the roller shutter matches the opening area of ​​the air inlet. Multiple positioning axes limit the movement trajectory of the roller shutter. A micro motor drives the drive wheel to move the roller shutter. The control unit responds to the power-on or power-off command and can automatically close the air inlet of the sensor when the detector is not in use, so as to protect the sensor, prevent further reaction of the electrochemical sensor, extend its service life, ensure detection effect, extend the calibration cycle, reduce additional maintenance workload, reduce the cost of use, and achieve seamless operation without affecting the normal use of the user. No additional protective cover or protective box is required, which achieves the convenience of use. The technical measures do not affect the original function of the detector itself.

[0008] Optionally, a circuit board is fixed inside the main body of the detector, and four sets of sensors are all mounted on the circuit board. A cover is fixed to the outside of the sensors to ensure that the four sets of sensors are at the same height, and the cover has ventilation holes.

[0009] By adopting the above technical solution, four sets of sensors are set on the circuit board, and a cover is selectively used according to the actual height of the four sets of sensors to ensure that the height of the four sets of sensors can be kept consistent. Ventilation holes are opened on the cover, and the width of the roller shutter is adapted to the opening range of the ventilation holes of the cover and the air inlet of the sensor. This not only ensures air intake for the sensor, but also allows the roller shutter to effectively cover the ventilation holes when the detector is not in operation, preventing dust and impurities in the air from entering the sensor, extending the sensor's service life and calibration cycle, and reducing the cost of use.

[0010] Optionally, the roller blind includes a long strip and a thin rope. A transition connection area is provided between the long strip and the thin rope. There are two thin ropes, which are symmetrically distributed on both sides of the same end of the long strip. The ends of the two thin ropes are fixedly connected to the two ends of the drive wheel. The end of the long strip is fixedly connected to the middle position of the drive wheel. The thin rope and the long strip are wound in opposite directions on the drive wheel.

[0011] By adopting the above technical solution, the long strip and the thin rope are connected to the drive wheel respectively. Under the action of the positioning shaft, the drive wheel can drive the roller shutter to move more stably when it rotates, ensuring that the roller shutter can accurately cover or expose the air inlet of the sensor, further improving the protection effect of the sensor, ensuring the detection performance of the detector, while extending the service life and calibration cycle of the sensor and reducing the cost of use.

[0012] Optionally, the drive wheel has perforations at the middle and both sides to facilitate the winding of the roller blind.

[0013] By adopting the above technical solution, the drive wheel has perforations to facilitate the winding of the roller blind. The thin rope portion is fixed in the grooves on both sides of the drive wheel, while the long strip portion is fixed in the middle groove of the drive wheel, with the thin rope portion and the long strip portion winding in opposite directions. The roller blind passes through a predetermined positioning shaft, maintaining a certain tension after being fixed on the drive wheel, ensuring stable movement of the roller blind and more reliably covering and releasing the sensor's air inlet, thus improving the protection effect on the sensor. In addition, to prevent the thin rope portion and the long strip portion from interfering with each other on the drive wheel and to maintain the uniformity of the force applied to the roller blind, a positioning post is used to change the running direction of the thin rope portion.

[0014] Optionally, the detector body is equipped with a slotted photoelectric switch, which is located between two adjacent positioning shafts and electrically connected to the control unit. When the roller shutter moves, it blocks or releases the light path signal of the slotted photoelectric switch, and the control unit controls the drive device to operate based on the feedback of the light path signal.

[0015] By adopting the above technical solution, the slotted photoelectric switch can accurately control the blocking and opening of the roller shutter, ensuring that the roller shutter can be accurately blocked or opened in place, thus effectively protecting the sensor. At the same time, the slotted photoelectric switch can be turned off after the control purpose is achieved to reduce power consumption.

[0016] Optionally, a steel mesh is fixed to the upper end of the cover.

[0017] By adopting the above technical solution, fixing a steel mesh to the upper part of the housing can further block dust and impurities from entering the sensor, providing more reliable protection for the sensor, further ensuring sensor performance and extending its service life.

[0018] Optionally, the micro motor is connected to the drive wheel via a belt drive, and the drive wheel has grooves on both sides of its rim to accommodate the thin rope of the roller blind.

[0019] By adopting the above technical solution, the micro motor and the drive wheel are connected by belt drive, which makes the power transmission smooth and can effectively drive the drive wheel to rotate. The grooves on both sides of the drive wheel can accommodate the thin rope part of the roller blind, and the groove in the middle of the drive wheel can accommodate the long strip part, which is wound in the opposite direction. This ensures that the roller blind is stable and orderly during winding and release, and avoids the roller blind from shifting or falling off. This better covers and opens the air inlet of the sensor, and enhances the protection effect of the sensor.

[0020] Optionally, the roller blind is made of a flexible material and has a waterproof and dustproof sealing layer on its surface.

[0021] By adopting the above technical solution, the roller shutter made of flexible material can better fit the air inlet of the sensor. The waterproof and dustproof sealing layer on the surface of the roller shutter can effectively block moisture, dust and impurities in the air, further enhancing the protection effect on the sensor, reducing the degree of influence of external factors on the sensor, thereby better extending the service life of the sensor and detector, reducing the number of calibrations, and reducing the cost of use.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Through protective devices, drive devices and control units, the sensor air inlet is automatically sealed when the detector is not in use, protecting the sensor, preventing further electrochemical reactions, preventing the accumulation of silicide and sulfide dust in the air on the sensor's breathable membrane, extending the detector's service life and calibration cycle, and reducing operating costs; 2. The control unit responds to the power-on or power-off commands of the main body of the detector, enabling seamless operation without affecting the user's normal use of the detector. No additional protective cover or box is required, making it convenient to use. 3. The slotted photoelectric switch works in conjunction with the control unit to control the drive device based on the feedback of the optical path signal, ensuring that the roller shutter is properly blocked or opened. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the display detector after the top cover has been removed; Figure 3 This is to show a schematic diagram of the roller shutter structure; Figure 4 This is a bottom view schematic diagram showing the structure of the roller blind's cord winding around the drive wheel; Figure 5 This is a side view schematic diagram showing the roller shutter, positioning shaft, and winding structure.

[0024] In the diagram, 1 is the main body of the detector; 11 is the circuit board; 2 is the protective device; 21 is the roller shutter; 211 is the long strip; 212 is the thin rope; 22 is the positioning shaft; 3 is the drive device; 31 is the micro motor; 32 is the drive wheel; 4 is the control unit; 5 is the sensor; 51 is the cover; and 6 is the slotted photoelectric switch. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0026] This application discloses a protective device for a portable detector.

[0027] Example 1: refer to Figure 1 and Figure 2 A protective device for a portable detector includes a detector body 1. When the detector body 1 is set horizontally, a circuit board 11 is horizontally fixed inside the detector body 1. Four sets of sensors 5 are set on the circuit board 11, including one catalytic combustion sensor and three electrochemical sensors, which are used to detect combustible gas, oxygen, carbon monoxide and sulfur dioxide, respectively. The four sets of sensors 5 are arranged in a 2x2 row and column, and each of the four sets of sensors 5 has an air inlet.

[0028] The electrochemical sensors have the same external dimensions, while the catalytic sensors are smaller. Therefore, a housing 51 is fixed to the outside of the catalytic sensor. The housing 51 ensures that the catalytic sensor and electrochemical sensor have the same shape, especially in height. The housing 51 has ventilation holes and is cylindrical, made of ABS material. A dense steel mesh is fixed to its upper end to protect the sensor 5. Multiple support feet are provided at the bottom of the housing 51 for heat-fusion fixation to the circuit board 11. The housing 51 and the catalytic sensor are concentrically fixed to the circuit board.

[0029] refer to Figure 2 and Figure 3 The detector body 1 is equipped with a protective device 2, a drive device 3, and a control unit 4 for electrical control of the internal parts of the detector body 1. The control unit 4 is not shown in the accompanying drawings. The protective device 2 includes a roller shutter 21 and multiple positioning shafts 22. The roller shutter 21 is made of an airtight material, such as rubber or plastic. The roller shutter 21 also needs to be made of a flexible material, such as silicone. This material not only has good flexibility, but also has a waterproof and dustproof sealing layer on its surface, such as a polytetrafluoroethylene coating, which can better prevent dust and moisture from entering the sensor 5.

[0030] The roller blind 21 includes a thin rope section 212 and a long strip section 211. The thin rope section 212 is provided with two thin ropes, which are symmetrically distributed on both sides of the same end of the long strip section 211. A triangular transition connection area is provided between the thin rope section 212 and the long strip section 211 to ensure that the tension applied by the thin rope section 212 is evenly distributed to the long strip section 211, and the roller blind 21 can withstand a certain tension. The width of the roller blind 21 is related to the lateral distance between the two sensors 5. The length of the long strip section 211 and the thin rope section 212 is more than 3 times the longitudinal distance between the two sensors 5. The area of ​​the roller blind 21 can completely cover the air inlets of all sensors 5.

[0031] refer to Figure 4 and Figure 5The positioning shaft 22 includes positioning shafts 1# to 6# and positioning posts 7# to 10#. The specific positions of the positioning shafts / posts are marked as shown in the attached diagram of the instruction manual, and they are reasonably distributed to guide the roller shutter 21 to move along a predetermined trajectory. Among them, positioning shafts 1# to 6# are rotatably connected to the main body 1 of the detector, and positioning shafts 4# and 5# can also be adjusted in installation position to facilitate adjustment of the tension of the roller shutter 21; positioning posts 7# to 10# are fixedly connected to the circuit board 11 to adjust the movement direction of the thin rope section, ensuring uniform tension and stable movement of the roller shutter.

[0032] refer to Figure 2 The drive device 3 includes a micro motor 31 and a drive wheel 32. The micro motor 31 is fixed inside the main body 1 of the detector. The drive wheel 32 is horizontally arranged on the side of the four sets of sensors 5 and parallel to the four sets of sensors 5, and is rotatably mounted on the outer shell of the detector. The micro motor 31 and the drive wheel 32 are connected by a belt drive. The belt device here can also be replaced by a gear.

[0033] The drive wheel 32 has grooves at both ends, and the grooves have through holes for fixing the roller shutter 21. (See details...) Figure 4 As shown. The grooves and perforations at both ends of the drive wheel 32 allow for the winding and fixing of the thin rope section 212 of the roller blind 21. The roller blind 21 is attached... Figure 4 Appendix Figure 5 As shown, the long strip 211 of the roller blind 21, passing through the positioning shaft 22, is wound around the middle position of the drive wheel 32. The long strip 211 and the thin rope 212 are wound in opposite directions on the drive wheel 32, and the long strip of the roller blind 21 is fixed to the through hole in the middle position of the drive wheel 32. Both the long strip 211 and the thin rope 212 of the roller blind 21 should be wound around the drive wheel 32. Figure 5 To show the winding direction of the thin rope portion 212 and the long strip portion 211, they are shown separately, not to indicate that they are wound on different parts.

[0034] After the roller blind 21 is installed, adjust the position of positioning shaft 4# or 5# to maintain a certain tension in the roller blind. Then, rotate the drive wheel 32 to completely cover the sensor 5 with the long strip 211 of the roller blind 21. The movement distance of the roller blind 21 is controlled by adjusting the running time of the micro motor 31. The purpose of positioning shafts 1# to 3# is to press the air inlet of the sensor 5 with the roller blind 21, protecting the sensor 5 when the main body 1 of the detector is not working, and preventing dust and impurities in the air from entering the sensor 5 and affecting its performance. Positioning columns 7# to 10# are used to control the movement path of the thin rope part 212 of the roller blind 21, providing positioning guidance for the movement of the thin rope part 212 of the roller blind 21, ensuring uniform tension, and making the roller blind move stably.

[0035] refer to Figure 2The detector body 1 contains a slotted photoelectric switch 6, which is positioned between positioning shafts 4# and 5#. The slotted photoelectric switch 6 is mounted on circuit board 11 and electrically connected to the control unit 4 of the detector body 1. The control unit 4 can control the photoelectric switch tube inside the slotted photoelectric switch 6 to emit light and determine whether the emitted light is received. When the long strip 211 of the roller shutter 21 moves into the slotted photoelectric switch 6, the light emitted by the photoelectric switch tube is blocked, and the photoelectric switch tube cannot receive the emitted light. When the thin rope 212 moves into the slotted photoelectric switch 6, the light emitted by the photoelectric switch tube is not blocked, and the photoelectric switch tube receives the emitted light.

[0036] The slotted photoelectric switch 6 determines whether the light source is present or absent, and then the control unit 4 controls the micro motor 31 to rotate after a delay to ensure that the roller shutter 21 is properly blocked or fully opened. After the micro motor 31 stops operating, the slotted photoelectric switch 6 is turned off to reduce power consumption.

[0037] The presence of the slotted photoelectric switch 6 allows for timely detection of abnormalities and alarm prompts in cases such as the micro motor 31 failing to rotate or the roller shutter 21 moving abnormally. This is achieved by analyzing the relationship between the time when the control command is sent to the drive device 3 and the time when the state of the slotted photoelectric switch 6 switches, thus reminding the user to take manual action and ensuring the effectiveness of the protection measures.

[0038] When the main body 1 of the detector is powered on, the control unit 4 controls the micro motor 31 to start, and the drive wheel 32 rotates clockwise, winding the roller shutter 21 around the drive wheel 32, exposing the sensor 5 which was previously covered by the roller shutter 21. Then, the micro motor 31 stops running, and the main body 1 of the detector begins its detection work. When the operator turns off the main body 1 of the detector, the control unit 4 of the main body 1 automatically controls the micro motor 31 to rotate in the opposite direction, and the drive wheel 32 rotates counterclockwise, covering the sensor 5 with the roller shutter 21 to protect it. In this way, when the main body 1 of the detector is in normal use, it does not affect the air intake of the sensor 5. When the main body 1 of the detector is not in use, the roller shutter 21 automatically covers the air intake of the sensor 5. This is a seamless operation for the operator, convenient and efficient.

[0039] The implementation principle of the protection device for a portable detector in this embodiment is as follows: Through the coordinated operation of the protection device 2, the drive device 3, and the control unit 4, the protection device automatically protects and exposes the sensor 5 when the detector is turned on and off. When the detector is not in use, it automatically seals the air inlet of the sensor 5 to prevent further reaction of the electrochemical sensor 5 and extend its service life; it prevents the accumulation of silicides and sulfides in the air from affecting the catalytic sensor 5 and the semiconductor sensor 5; it prevents dust accumulation on the breathable membrane of the sensor 5 from affecting the air intake effect; and it does not affect the air intake of the sensor 5 during normal use of the detector. This seamless operation method ensures detection effectiveness, reduces operating costs, and improves ease of use, representing a significant improvement over traditional protection measures.

[0040] Example 2: This example differs from Example 1 in that: The roller shutter 21 can directly cover the air inlet inside the main body 1 of the detector, instead of covering the air inlet of the sensor 5. In this case, simply apply the positioning shafts 1# to 3# in reverse to the roller shutter 21, ensuring that the positioning shafts 1# to 6# are in the appropriate positions. In this example, by directly covering the air inlet of the main body 1 of the detector with the roller shutter 21, the roller shutter 21 automatically opens when the instrument is in use, allowing the detector to function normally, and protects the sensor when the instrument is not in use.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A protective device for a portable detector, comprising a detector body (1), characterized in that: It also includes a protective device (2), a drive device (3), and a control unit (4). The detector body (1) is equipped with four arrays of sensors (5). The protective device (2) includes a roller shutter (21) made of airtight flexible material and multiple positioning shafts (22) for limiting the movement trajectory of the roller shutter (21). The roller shutter (21) is semi-enclosed and set above and below the four sets of sensors (5). The coverage width of the roller shutter (21) is adapted to the opening area of ​​the air inlet of the four sets of sensors (5). The drive device (3) includes a micro motor (31) and a drive wheel (32). The micro motor (31) is fixed inside the detector body (1). The micro motor (31) is connected to the drive wheel (32). The micro motor (31) drives the drive wheel (32) to rotate. The drive wheel (32) is set on the side of the four sets of sensors (5). The control unit (4) is electrically connected to the main controller of the detector body (1) to respond to the power-on or power-off command of the detector body (1).

2. The protective device for a portable detector according to claim 1, characterized in that: The detector body (1) has a circuit board (11) fixed inside. Four sets of sensors (5) are all set on the circuit board (11). A cover (51) is fixed on the outside of the sensor (5) to make the four sets of sensors (5) keep the height consistent. The cover (51) has ventilation holes.

3. The protective device for a portable detector according to claim 1, characterized in that: The roller blind (21) includes a long strip (211) and a thin rope (212). A transition connection area is provided between the long strip (211) and the thin rope (212). There are two thin ropes (212), which are symmetrically distributed on both sides of the same end of the long strip (211). The ends of the two thin ropes (212) are fixedly connected to the two ends of the drive wheel (32), and the end of the long strip (211) is fixedly connected to the middle position of the drive wheel (32).

4. The protective device for a portable detector according to claim 1, characterized in that: The micro motor (31) is connected to the drive wheel (32) by belt drive. The drive wheel (32) has grooves on both sides of the wheel rim to accommodate the thin rope part (212) of the roller blind (21), and a groove in the middle to accommodate the long strip part (211) of the roller blind (21).

5. The protective device for a portable detector according to claim 3, characterized in that: The drive wheel (32) has perforations at the middle and sides to facilitate the winding of the roller blind (21), and the thin rope part (212) and the long strip part (211) are wound in opposite directions on the drive wheel (32).

6. The protective device for a portable detector according to claim 1, characterized in that: The detector body (1) is equipped with a slotted photoelectric switch (6). The slotted photoelectric switch (6) is located between two adjacent positioning shafts (22) and is electrically connected to the control unit (4). When the roller shutter (21) moves, it blocks or releases the light path signal of the slotted photoelectric switch (6). The control unit (4) controls the drive device (3) to operate based on the feedback of the light path signal.

7. The protective device for a portable detector according to claim 2, characterized in that: A steel mesh is fixed to the upper end of the cover (51).

8. The protective device for a portable detector according to claim 1, characterized in that: The roller blind (21) is made of flexible material and has a waterproof and dustproof sealing layer on its surface.

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