A hand-held formaldehyde test device

Abstract

The application relates to the technical field of testers, and discloses a handheld formaldehyde testing device, which comprises a tester main body and a display screen installed on the front side of the upper end of the tester main body, a mounting cavity is arranged on the rear side of the lower end of the tester main body, the inner wall of the mounting cavity is slidably connected with a rear cover, a supporting block and a partition plate, a connecting port is arranged in the middle of the rear cover, the inner wall of the connecting port is slidably connected with a frame, the inside of the frame is fixedly connected with a dust screen, and one side of the rear cover located in the tester main body abuts against one side of the supporting block and the partition plate. The handheld formaldehyde testing device is supported in three modes through the cooperation of the adjustable soft strip and the magic tape, that is, the soft strip is wound around the palm to enhance the holding stability and avoid the device from falling during single-handed operation, the soft strip can be fixed on the wrist or the arm to meet the real-time detection requirement during the mobile operation of the staff, and the soft strip can be bound to a fixed object such as a handrail or a support to realize static detection without continuous hand holding.

Description

Technical Field

[0001] This invention relates to the field of testing instrument technology, specifically a handheld formaldehyde testing device. Background Technology

[0002] A fire-resistant cover for new energy batteries is a passive safety protection component specifically used in new energy vehicles (such as electric vehicles and electric buses) and energy storage systems. New energy vehicle battery packs face safety challenges such as physical impact, thermal runaway, and environmental erosion during operation. To provide physical protection, prevent the spread of thermal runaway, and resist environmental erosion, the outer wall of the battery pack is often wrapped with a fire-resistant cover made of a blend of para-aramid, meta-aramid, and flame-retardant cotton.

[0003] In the production process of fire-resistant covers for new energy batteries made from a blend of para-aramid, meta-aramid, and flame-retardant cotton, some flame-retardant cotton may use formaldehyde-containing flame retardants (such as urea-formaldehyde resin), which may release free formaldehyde during processing. Furthermore, if formaldehyde-containing adhesives (such as urea-formaldehyde resin glue) are used in the blending process, formaldehyde pollution may also be introduced. At the same time, some auxiliary materials such as dyes and waterproofing agents may also release formaldehyde if they contain aldehydes. Therefore, processing personnel need to regularly use a handheld formaldehyde tester to test the formaldehyde levels in the environment.

[0004] Patent CN211402317U discloses a formaldehyde tester, including a tester body. A limiting block is fixedly connected to the top left side of the tester body. An adjusting plate is slidably installed inside the limiting block. A dustproof plate is fixedly connected to the top of the adjusting plate. An adjusting head is fixedly connected to the bottom left side of the adjusting plate. A cleaning component is fixedly connected to the right side of the bottom of the dustproof plate. This design, with its formaldehyde tester body, limiting block, adjusting plate, dustproof plate, adjusting head, and cleaning component, solves the problems of existing household formaldehyde detectors being inconvenient for daily observation and use, easily accumulating dust on a desktop and going unnoticed, reducing their practicality, and lacking a dustproof top, leading to dust accumulation at the detection port and affecting usability. This formaldehyde tester offers the advantages of easy daily observation and dust prevention, improving its stability in use.

[0005] However, the formaldehyde tester mentioned above still has the following problems in actual use:

[0006] When using formaldehyde testing instruments in blended fabric processing, they typically need to be placed in a specific area for 5 to 10 minutes to complete the test. During this time, workers often need to handle other processes simultaneously, making it difficult to continuously hold the device. Therefore, the placement of the instrument becomes a practical problem. However, most formaldehyde testing instruments currently on the market lack the design function of being fixed, tied, or suspended, resulting in limitations such as inconvenient positioning and low operational efficiency, affecting the convenience and continuity of on-site operations. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a handheld formaldehyde testing device that can be fixed in place by a soft strip, eliminating the need for continuous handheld use.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a handheld formaldehyde testing device, comprising a testing instrument body and a display screen installed on the upper front side of the testing instrument body. A mounting cavity is provided on the lower rear side of the testing instrument body. A back cover, a support block, and a partition plate are slidably connected to the inner wall of the mounting cavity. A connection port is provided through the center of the back cover. A frame is slidably connected to the inner wall of the connection port. A dustproof net is fixedly connected inside the frame. One side of the back cover inside the testing instrument body abuts against one side of the support block and the partition plate. The upper surface of the support block is fixedly connected to the bottom surface of the partition plate. A right opening is provided on the side of the support block near the back cover. An air inlet is provided through the upper surface of the right opening. A formaldehyde sensor is fixedly connected to the inner wall of the partition plate near the back cover. An adjustment component is connected to the inner wall of the air inlet. One end of the adjustment component extends to the outside of the back cover and is connected to a flexible strip. The other end of the flexible strip is fixedly connected to the rear side wall of the upper end of the testing instrument body. Velcro is fixedly connected to the side wall of the flexible strip.

[0009] Furthermore, the adjustment assembly includes a U-shaped block, a movable plate, a corner rod, and an anti-detachment strip. The upper surface of the movable plate is fixedly connected to the bottom surface of the anti-detachment strip. One end of the movable plate has a through-hole, the size of which is not smaller than the size of the formaldehyde sensor. The end of the movable plate near the through-hole extends to the outside of the back cover and is fixedly connected to the side wall of the U-shaped block. The two ends of the U-shaped block are fixedly connected to the two ends of the corner rod, respectively. A soft strip passes between the corner rod and the U-shaped block and is slidably connected to both the corner rod and the U-shaped block. The movable plate is slidably connected to the support block.

[0010] Furthermore, a central plate is fixedly connected to the inner wall of the support block. A through-hole is opened in the middle of the central plate. A left opening is opened on the side of the support block away from the rear cover. The left and right openings are located on both sides of the central plate. A return air port is opened through the upper surface of the left opening. An opening is opened through the side of the partition plate away from the formaldehyde sensor. The opening, return air port, left opening, through-hole, and right opening are connected. A dust removal mechanism is connected inside the left opening and through-hole. The other end of the dust removal mechanism is connected to the frame. The end of the moving plate away from the through-hole is located inside the return air port. A recess is opened on the side of the air inlet near the left opening. The anti-detachment strip is slidably connected to the recess.

[0011] Furthermore, the dust removal mechanism includes a motor, a transmission rod, a striking assembly, and several extension rods. One end of each extension rod is fixedly connected to the side of the frame near the right opening. The outer wall of the motor is fixedly connected to the inner wall of the support block near the left opening. The output shaft of the motor is fixedly connected to one end of the transmission rod. The other end of the transmission rod passes through the opening and is connected to the striking assembly. The other end of the striking assembly abuts against the several extension rods.

[0012] Furthermore, the striking assembly includes a support rod, a spring, and a striking rod. One end of the support rod is fixedly connected to the end of the transmission rod away from the motor, the other end of the support rod is fixedly connected to one end of the spring, the other end of the spring is fixedly connected to one end of the striking rod, and the other end of the striking rod abuts against several extension rods.

[0013] Furthermore, a fan blade is fixedly connected to the outer wall of the transmission rod. The fan blade is located inside the opening and faces the dustproof net.

[0014] Furthermore, an auxiliary rod is fixedly connected to the outer wall of the transmission rod, and the other end of the auxiliary rod is fixedly connected to the inner wall of the right opening. The auxiliary rod is located between the blower blade and the striking assembly.

[0015] Furthermore, the back cover has several No. 1 mounting holes on the side away from the display screen, and several No. 1 mounting blocks are fixedly connected to the outer wall of the frame. The several No. 1 mounting blocks are detachably connected to the several No. 1 mounting holes by several No. 1 bolts.

[0016] Furthermore, the side wall of the mounting cavity is provided with several No. 2 mounting ports, and the outer wall of the rear cover is fixedly connected with several No. 2 mounting blocks. The several No. 2 mounting blocks are detachably connected to the several No. 2 mounting ports by several No. 2 bolts.

[0017] Furthermore, the outer wall of the U-shaped block is fixedly connected to a No. 3 mounting block, which can be detachably connected to the rear cover by a No. 3 bolt.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This handheld formaldehyde testing device supports three usage modes through the combination of adjustable soft strips and Velcro: First, the soft strip is wrapped around the palm to enhance grip stability and prevent the device from slipping when operating with one hand; second, it can be fixed to the wrist or arm to meet the real-time testing needs of workers during mobile operations; third, it can be tied to fixed objects such as railings and brackets by the soft strip to achieve static testing without continuous hand-holding.

[0020] This handheld formaldehyde testing device, by setting an adjustment component, can flexibly change the effective length of the soft strip to adapt to fixed objects of different thicknesses (such as wrists, pipes, railings).

[0021] This handheld formaldehyde testing device features a dust removal mechanism and a striking component. The dust removal mechanism, driven by a motor, drives a transmission rod to periodically strike an extension rod, causing the frame and dustproof net to vibrate and shake off attached lint, dust, and other impurities.

[0022] This handheld formaldehyde testing device uses a fan blade on the transmission rod to generate a directional airflow, blowing away the shaken-off impurities and preventing secondary adhesion. It is especially suitable for high-dust environments such as cotton spinning workshops.

[0023] This handheld formaldehyde testing device features a movable plate that blocks the air inlet during dust removal, ensuring that the airflow is concentrated on the dust filter and preventing dust from entering the formaldehyde sensor detection area, thus guaranteeing detection accuracy.

[0024] This handheld formaldehyde testing device features a frame that is detachably connected to the rear cover via mounting block number one, facilitating individual disassembly for cleaning or replacement of the dust filter. Furthermore, the rear cover is connected to the main body of the testing device via mounting block number two, allowing for the removal of core components such as the support block and motor, facilitating maintenance of the dust removal mechanism. Additionally, the U-shaped block is connected to the rear cover via mounting block number three, preventing the moving plate from loosening during daily use and simplifying the maintenance process for the adjustment components. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall appearance of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall appearance of the invention from another perspective;

[0027] Figure 3 This is a rear-view view of the main body of the tester of the present invention;

[0028] Figure 4 This is a detailed connection diagram of the support block, flexible strip, and partition plate of the present invention;

[0029] Figure 5 For the present invention Figure 4 Explosion diagrams of various components;

[0030] Figure 6 For the present invention Figure 5 A schematic diagram of the various components from another perspective;

[0031] Figure 7 This is a cross-sectional schematic diagram of the support block, partition plate, and center plate of the present invention;

[0032] Figure 8 For the present invention Figure 7 Explosion diagrams of various components;

[0033] Figure 9 This is a front view of the support block and center plate of the present invention;

[0034] Figure 10 This is an exploded view of the dust removal mechanism, fan blades, and auxiliary rods of the present invention.

[0035] In the diagram: 1. Main body of the tester; 2. Display screen; 3. Back cover; 4. Frame; 5. Dustproof net; 6. Mounting block 1; 7. Mounting block 2; 8. U-shaped block; 9. Soft strip; 10. Velcro; 11. Mounting cavity; 12. Mounting port 2; 13. Support block; 14. Motor; 15. Divider plate; 16. Opening; 17. Moving plate; 18. Formaldehyde sensor; 19. Corner rod; 20. Mounting block 3; 21. Transmission rod; 22. Auxiliary rod; 23. Fan blade; 24. Connection port; 25. Mounting port 1; 26. Right opening; 27. Extension rod; 28. Left opening; 29. ​​Through port; 30. Center plate; 31. Anti-detachment strip; 32. Support rod; 33. Spring; 34. Striking rod; 35. Through port; 36. Air inlet; 37. Air return port; 38. Insert. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] Please see Figures 1-10 A handheld formaldehyde testing device includes a main body 1 and a display screen 2 mounted on the front upper part of the main body 1. A mounting cavity 11 is formed on the rear lower part of the main body 1. A rear cover 3, a support block 13, and a partition plate 15 are slidably connected to the inner wall of the mounting cavity 11. A connection port 24 is formed through the center of the rear cover 3. A frame 4 is slidably connected to the inner wall of the connection port 24. A dustproof net 5 is fixedly connected inside the frame 4. One side of the rear cover 3 inside the main body 1 abuts against one side of the support block 13 and the partition plate 15. The upper surface of the support block 13 is fixedly connected to the bottom surface of the partition plate 15. The support block 13 has a right opening 26 on the side near the rear cover 3. An air inlet 36 is opened through the upper surface of the right opening 26. A formaldehyde sensor 18 is fixedly connected to the inner wall of the partition plate 15 near the rear cover 3. An adjustment component is connected to the inner wall of the air inlet 36. One end of the adjustment component extends through to the outside of the rear cover 3 and is connected to a soft strip 9. The other end of the soft strip 9 is fixedly connected to the rear side wall of the upper part of the tester body 1. A Velcro 10 is fixedly connected to the side wall of the soft strip 9.

[0038] It should be noted that the main body 1, display screen 2, and formaldehyde sensor 18 all utilize mature technologies found in existing handheld formaldehyde testers, and handheld formaldehyde testers typically also include, but are not limited to:

[0039] A microprocessor that processes sensor signals in real time, performs data calibration (such as automatic zero tracking), TWA / STEL calculation (time-weighted average and short-term exposure limit), and supports user-defined alarm thresholds, data storage intervals, and other parameters;

[0040] A temperature and humidity sensor that monitors ambient temperature and humidity (accuracy ±0.5℃ / ±3%RH) and compensates for the interference of temperature / humidity on formaldehyde detection through algorithms;

[0041] Composed of Teflon tubing and a dust filter, this gas filtration system prevents dust from clogging the sensor, adsorbs interfering gases (such as alcohol and perfume), and extends the sensor's lifespan.

[0042] 5000-6000mAh, supports continuous operation for 12-24 hours, compatible with power bank power supply, and features overcharge / over-discharge protection and temperature monitoring to prevent battery bulging or explosion.

[0043] Supports low / high alarms, range alarms, weighted average alarms, and multi-level alarm modules with customizable thresholds;

[0044] Furthermore, in this invention, only partial improvements are made to the disclosed structure. Structures not mentioned, such as the microprocessor and temperature and humidity sensor, are not modified in any way and retain their original functions and effects.

[0045] As a preferred embodiment of the present invention, the adjustment assembly includes a U-shaped block 8, a movable plate 17, a corner rod 19, and an anti-detachment strip 31. The upper surface of the movable plate 17 is fixedly connected to the bottom surface of the anti-detachment strip 31. One end of the movable plate 17 has a through-hole 29, the size of which is not smaller than the size of the formaldehyde sensor 18. The end of the movable plate 17 near the through-hole 29 extends to the outside of the rear cover 3 and is fixedly connected to the side wall of the U-shaped block 8. The two ends of the U-shaped block 8 are fixedly connected to the two ends of the corner rod 19, respectively. The soft strip 9 passes between the corner rod 19 and the U-shaped block 8 and is slidably connected to both the corner rod 19 and the U-shaped block 8. The movable plate 17 is slidably connected to the support block 13.

[0046] More specifically, by setting the adjustment component, a support can be provided for the side of the soft strip 9 away from the main body 1 of the tester. At the same time, the user can also adjust the length of the soft strip 9 according to the thickness of the binding position to improve the stability when fixing.

[0047] As a preferred embodiment of the present invention, a central plate 30 is fixedly connected to the inner wall of the support block 13. A through-hole 35 is provided in the middle of the central plate 30. A left opening 28 is provided on the side of the support block 13 away from the rear cover 3. The left opening 28 and the right opening 26 are located on both sides of the central plate 30, respectively. A return air port 37 is provided through the upper surface of the left opening 28. An opening 16 is provided through the side of the partition plate 15 away from the formaldehyde sensor 18. The opening 16, the return air port 37, the left opening 28, the through-hole 35 and the right opening 26 are connected. A dust removal mechanism is connected inside the left opening 28 and the through-hole 35. The other end of the dust removal mechanism is connected to the frame 4. The end of the moving plate 17 away from the through-hole 29 is located in the return air port 37. An inlet 38 is provided on the side of the air inlet 36 near the left opening 28. The anti-detachment strip 31 is slidably connected to the inlet 38.

[0048] More specifically, in a blended textile processing plant, there may be a lot of cotton lint. This cotton lint may stick to the dustproof net 5 due to static electricity and other reasons, causing blockage and affecting the detection structure. At this time, by opening the opening 16, the air return port 37, the left opening 28, the through opening 35 and the right opening 26, and setting the dust removal mechanism inside the left opening 28 and the through opening 35, the cotton lint stuck to the outside of the dustproof net 5 can be shaken off after a period of use (such as when the day is over).

[0049] As a preferred embodiment of the present invention, the dust removal mechanism includes a motor 14, a transmission rod 21, a striking assembly, and several extension rods 27. One end of each extension rod 27 is fixedly connected to the side of the frame 4 near the right opening 26. The outer wall of the motor 14 is fixedly connected to the inner wall of the support block 13 near the left opening 28. The output shaft of the motor 14 is fixedly connected to one end of the transmission rod 21. The other end of the transmission rod 21 passes through the through-hole 35 and is connected to the striking assembly. The other end of the striking assembly abuts against the several extension rods 27.

[0050] More specifically, by setting up motor 14 and transmission rod 21, during dust removal, the staff only needs to turn on the corresponding switch to automatically remove the dust, without the need for manual handling, which is convenient and efficient.

[0051] As a preferred embodiment of the present invention, the striking assembly includes a support rod 32, a spring 33, and a striking rod 34. One end of the support rod 32 is fixedly connected to the end of the transmission rod 21 away from the motor 14, and the other end of the support rod 32 is fixedly connected to one end of the spring 33. The other end of the spring 33 is fixedly connected to one end of the striking rod 34, and the other end of the striking rod 34 abuts against a plurality of extension rods 27.

[0052] More specifically, by setting up a striking component, the power transmitted by the motor 14 and the transmission rod 21 can be accurately applied to the frame 4, thereby shaking off the cotton wadding located on the dustproof net 5 inside the frame 4.

[0053] As a preferred embodiment of the present invention, a fan blade 23 is fixedly connected to the outer wall of the transmission rod 21. The fan blade 23 is located inside the through-hole 35 and faces the dustproof net 5.

[0054] More specifically, by setting the fan blades 23, the knocking components can be assisted in blowing away the cotton fibers that have been shaken off the dustproof net 5, reducing the probability of secondary adhesion.

[0055] As a preferred embodiment of the present invention, an auxiliary rod 22 is fixedly connected to the outer wall of the transmission rod 21, and the other end of the auxiliary rod 22 is fixedly connected to the inner wall of the right opening 26. The auxiliary rod 22 is located between the blower blade 23 and the striking assembly.

[0056] More specifically, by setting the auxiliary rod 22, the stability of the transmission rod 21 can be improved, and the transmission rod 21 itself can be prevented from shaking when the striking component strikes the extension rod 27.

[0057] As a preferred embodiment of the present invention, the back cover 3 has a plurality of first mounting ports 25 on the side away from the display screen 2, and a plurality of first mounting blocks 6 are fixedly connected to the outer wall of the frame 4. The plurality of first mounting blocks 6 are detachably connected to the plurality of first mounting ports 25 by a plurality of first bolts.

[0058] More specifically, since components such as the motor 14 and the transmission rod 21 are located inside the support block 13, and these components are likely to malfunction during long-term use, by setting the first mounting block 6 and the first mounting port 25, the back cover 3, the support block 13 and other components can be directly removed from the mounting cavity 11 in one go when a malfunction occurs or during regular maintenance.

[0059] As a preferred embodiment of the present invention, the side wall of the mounting cavity 11 is provided with a plurality of second mounting ports 12, and the outer wall of the rear cover 3 is fixedly connected with a plurality of second mounting blocks 7. The plurality of second mounting blocks 7 are detachably connected to the plurality of second mounting ports 12 by a plurality of second bolts.

[0060] More specifically, the frequency of maintenance of all components inside the support block 13 is relatively low. However, because the extension rod 27 needs to collide with the striking component, the probability of maintenance of components such as the frame 4, dustproof net 5, and extension rod 27 is relatively high. At this time, by setting the second mounting block 7 and the second mounting port 12, these components can be inspected or replaced individually.

[0061] As a preferred embodiment of the present invention, the outer wall of the U-shaped block 8 is fixedly connected with a third mounting block 20, and the third mounting block 20 is detachably connected to the rear cover 3 by a third bolt.

[0062] More specifically, by setting the No. 3 mounting block 20 between the U-shaped block 8 and the rear cover 3, firstly, it can prevent the moving plate 17 from being pulled out of the support block 13 when only the length of the soft strip 9 needs to be adjusted; secondly, it can also prevent the moving plate 17 from loosening and falling off on its own during daily use and transportation of the tester body 1.

[0063] It should be noted that the tightness of the No. 3 bolt can be controlled by a knob using your fingers, adjusting the tension between the U-shaped block 8 and the back cover 3.

[0064] In summary, such as Figures 1 to 10 As shown, before using the handheld formaldehyde testing device of this invention, first turn it on using the buttons on the lower front side of the main body 1 of the testing device, and then set the relevant data using these buttons. Then follow these steps:

[0065] When staff first used the device, they then conducted tests according to standard operating procedures. The tests can be broadly categorized into the following three scenarios:

[0066] Firstly, staff need to use one hand for other tasks, as the main body of the testing device 1 can only be held with one hand.

[0067] The operator holds the middle of the testing device body 1 with one hand (e.g., the right hand), inserts the four fingers of the right hand (excluding the thumb) into the soft strip 9, and then presses the thumb on the front or side of the testing device body 1. Then, the operator uses their left hand to pass through the rough and hook sides of the Velcro 10 (the rough and hook sides of the Velcro 10 can be like...). Figure 5 and Figure 6 As shown in the filling part, the end of the Velcro 10 is a hook surface, and the other parts are rough surfaces) will make the soft strip 9 stick to itself. At this time, the connection stability between the tester body 1 and the staff's palm can be increased, and the probability of the tester body 1 falling off can be reduced.

[0068] Secondly, while both hands of the staff need to perform other tasks, the staff also need to move within a specific area.

[0069] At this point, the operator can gradually shorten the end of the flexible strip 9 away from the main body 1 of the testing instrument from the position of the corner rod 19. At this time, the part of the flexible strip 9 adjacent to the main body 1 of the testing instrument will become looser and looser. Then, the operator can pass one hand through the space between the flexible strip 9 and the main body 1 of the testing instrument until the main body 1 of the testing instrument is on the operator's wrist or arm. Then, the operator can fasten it by using the hook and loop sides of the Velcro 10 on the flexible strip 9 (this is also the purpose of setting the hook side of the Velcro 10 to only a small section). At this point, the operator can carry the main body 1 of the testing instrument and move it within a certain area. At the same time, the operator's hands can be used for gas work.

[0070] Third, while the staff needs to perform other tasks with both hands, the location of the testing instrument body 1 on the staff's wrist or arm still causes some interference. Alternatively, the staff could be fixed at a specific work point.

[0071] At this point, the staff can unfold the soft strip 9 and then put the soft strip 9 and the main body 1 of the tester onto a railing, a pillar, or a bracket. This way, the main body 1 of the tester can be fixed in one position for testing without affecting the staff's hands.

[0072] In addition, since the columns and supports are of different thicknesses, if they are relatively thin, the soft strip 9 can be wrapped around the support and then fastened with the rough and hook sides of the Velcro 10. If they are relatively thick, the soft strip 9 can be completely removed from the corner rod 19 and then the entire soft strip 9 can be tied to the column so that the main body of the tester 1 is "suspended" on the column. These are three general usage scenarios. Of course, other scenarios may occur in actual use, but they are mostly within the scope of the above three scenarios and will not be described in detail here.

[0073] In addition, since the main body 1 of the tester is located in a factory environment during daily use, some cotton fibers will inevitably stick to the outside of the dustproof net 5 due to static electricity and other reasons. In order to avoid affecting the subsequent test data, after the test on the same day (or at other times, no specific time is specified), first loosen the Velcro 10 limit on the soft strip 9, and then loosen the No. 3 bolt. At this time, the U-shaped block 8 can move the moving plate 17 towards the rear cover 3.

[0074] During the movement of the moving plate 17, the opening 29, which was originally located between the formaldehyde sensor 18 and the air inlet 36, will gradually move to the outside of the back cover 3. At the same time, the end of the moving plate 17 away from the opening 29 will move to the space between the formaldehyde sensor 18 and the air inlet 36, blocking the space between the formaldehyde sensor 18 and the air inlet 36, while exposing the opening 16 and the return air port 37. Then, the staff can turn on the motor 14 by pressing the button on the main body 1 of the tester.

[0075] As the motor 14 starts, its output shaft drives the transmission rod 21 to rotate. Subsequently, the transmission rod 21 drives the support rod 32, spring 33 and striking rod 34 to rotate together. During the rotation, the striking rod 34 will collide with the extension rod 27 that extends from the frame 4 into the right opening 26. At this time, because of the deformable ability of the spring 33, the striking rod 34 can pass through the extension rod 27 after colliding with it, without affecting the rotation of the transmission rod 21.

[0076] When the extension rod 27 is struck by the striking rod 34, the extension rod 27 will inevitably vibrate. This vibration will act on the frame 4 and the dustproof net 5, thereby shaking off the cotton wool and other impurities that are stuck to the outer surface of the dustproof net 5 due to static electricity and other reasons.

[0077] In addition, when the transmission rod 21 rotates, it will also cause the fan blade 23 connected to the surface to rotate. After the fan blade 23 rotates, it will generate a certain amount of wind force. This wind will blow towards the inner surface of the frame 4 and the dustproof net 5, which can help the striking rod 34 to blow away the shaken and about-to-fall cotton lint. This not only improves the dust removal ability, but also avoids the probability of cotton lint sticking together again.

[0078] After the self-cleaning process is completed, the staff only needs to push the movable plate 17 back to its original position so that the opening 29 remains between the formaldehyde sensor 18 and the air inlet 36. Then, the U-shaped block 8 can be fastened to the back cover 3 with bolt No. 3.

[0079] Finally, it should be noted that because the movable plate 17 blocks the space between the formaldehyde sensor 18 and the air inlet 36, the air blown out by the fan blade 23 will directly act on the inside of the dustproof net 5, thereby blowing off the cotton fibers stuck to the outside of the dustproof net 5.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hand-held formaldehyde testing device, comprising a tester body (1) and a display screen (2) installed on the front side of the upper end of the tester body (1), characterized in that: A mounting cavity (11) is provided on the rear side of the lower end of the main body (1) of the tester. A rear cover (3), a support block (13), and a partition plate (15) are slidably connected to the inner wall of the mounting cavity (11). A connection port (24) is provided through the middle of the rear cover (3). A frame (4) is slidably connected to the inner wall of the connection port (24). A dustproof net (5) is fixedly connected inside the frame (4). The side of the rear cover (3) inside the main body (1) of the tester abuts against the side of the support block (13) and the partition plate (15). The upper surface of the support block (13) is flush with the bottom surface of the partition plate (15). The support block (13) has a right opening (26) on the side near the back cover (3). An air inlet (36) is opened through the upper surface of the right opening (26). A formaldehyde sensor (18) is fixedly connected to the inner wall of the partition plate (15) near the back cover (3). An adjustment component is connected to the inner wall of the air inlet (36). One end of the adjustment component extends through to the outside of the back cover (3) and is connected to a soft strip (9). The other end of the soft strip (9) is fixedly connected to the rear side wall of the upper end of the tester body (1). A Velcro (10) is fixedly connected to the side wall of the soft strip (9). The adjustment assembly includes a U-shaped block (8), a movable plate (17), a corner rod (19), and an anti-detachment strip (31). The upper surface of the movable plate (17) is fixedly connected to the bottom surface of the anti-detachment strip (31). One end of the movable plate (17) has a through-hole (29) with a size not smaller than that of the formaldehyde sensor (18). The end of the movable plate (17) near the through-hole (29) extends to the outside of the back cover (3) and is fixedly connected to the side wall of the U-shaped block (8). The two ends of the U-shaped block (8) are fixedly connected to the two ends of the corner rod (19). The soft strip (9) passes between the corner rod (19) and the U-shaped block (8) and is slidably connected to both the corner rod (19) and the U-shaped block (8). The movable plate (17) is slidably connected to the support block (13). A central plate (30) is fixedly connected to the inner wall of the support block (13). A through-hole (35) is provided in the middle of the central plate (30). A left opening (28) is provided on the side of the support block (13) away from the rear cover (3). The left opening (28) and the right opening (26) are located on both sides of the central plate (30). A return air port (37) is provided through the upper surface of the left opening (28). An opening is provided through the side of the partition plate (15) away from the formaldehyde sensor (18). 16), the opening (16), return air port (37), left port (28), through port (35) and right port (26) are connected, the support block (13) is internally connected to a dust removal mechanism, the other end of the dust removal mechanism is connected to the frame (4), the end of the moving plate (17) away from the through port (29) is located in the return air port (37), the air inlet (36) is provided with a slot (38) on the side near the left port (28), and the anti-detachment strip (31) is slidably connected to the slot (38); The dust removal mechanism includes a motor (14), a transmission rod (21), a striking assembly, and several extension rods (27). One end of each of the extension rods (27) is fixedly connected to the side of the frame (4) near the right opening (26). The outer wall of the motor (14) is fixedly connected to the inner wall of the support block (13) near the left opening (28). The output shaft of the motor (14) is fixedly connected to one end of the transmission rod (21). The other end of the transmission rod (21) passes through the through-hole (35) and is connected to the striking assembly. The other end of the striking assembly abuts against the several extension rods (27). The striking assembly includes a support rod (32), a spring (33), and a striking rod (34). One end of the support rod (32) is fixedly connected to the end of the transmission rod (21) away from the motor (14). The other end of the support rod (32) is fixedly connected to one end of the spring (33). The other end of the spring (33) is fixedly connected to one end of the striking rod (34). The other end of the striking rod (34) abuts against several extension rods (27). The outer wall of the transmission rod (21) is fixedly connected to a fan blade (23), the fan blade (23) is located inside the opening (35), and the fan blade (23) faces the dustproof net (5); During normal testing, the opening (29) on the moving plate (17) is located between the formaldehyde sensor (18) and the air inlet (36), and at this time, the part of the moving plate (17) away from the opening (29) is located inside the air return port (37). When cleaning, pull the U-shaped block (8) outward, and the U-shaped block (8) will drive the moving plate (17) to slide towards the outside of the back cover (3). The opening (29) between the formaldehyde sensor (18) and the air inlet (36) will gradually move to the outside of the back cover (3). The plate part of the moving plate (17) away from the opening (29) will move synchronously between the formaldehyde sensor (18) and the air inlet (36) to block the air inlet channel of the formaldehyde sensor (18). At this time, the plate part of the moving plate (17) will move out of the return air port (37), and the opening (16) and the return air port (37) will be connected. Then, the motor (14) will be turned on to clean the dust.

2. The handheld formaldehyde testing device according to claim 1, characterized in that: An auxiliary rod (22) is fixedly connected to the outer wall of the transmission rod (21). The other end of the auxiliary rod (22) is fixedly connected to the inner wall of the right opening (26). The auxiliary rod (22) is located between the blower blade (23) and the striking assembly.

3. The handheld formaldehyde testing device according to claim 2, characterized in that: The back cover (3) has several No. 1 mounting ports (25) on the side away from the display screen (2). Several No. 1 mounting blocks (6) are fixedly connected to the outer wall of the frame (4). The several No. 1 mounting blocks (6) are detachably connected to the several No. 1 mounting ports (25) by several No. 1 bolts.

4. The handheld formaldehyde testing device according to claim 3, characterized in that: The side wall of the mounting cavity (11) is provided with several No. 2 mounting ports (12), and the outer wall of the rear cover (3) is fixedly connected with several No. 2 mounting blocks (7). The several No. 2 mounting blocks (7) are detachably connected to the several No. 2 mounting ports (12) by several No. 2 bolts.

5. The handheld formaldehyde testing device according to claim 4, characterized in that: The outer wall of the U-shaped block (8) is fixedly connected to the No. 3 mounting block (20), and the No. 3 mounting block (20) can be detachably connected to the rear cover (3) by the No. 3 bolt.

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