CN115792126A - Measuring equipment for formaldehyde in ambient air - Google Patents

Abstract

The invention discloses a measuring device for formaldehyde in ambient air, which belongs to the technical field of formaldehyde measuring equipment. It comprises a casing, an inner frame is arranged on the inner side of the casing, a limiting frame is installed on the inner side of the casing, and a roller is connected to the inner side of the limiting frame for rotation. , the inner side of the inner frame is equipped with a No. 1 motor, and the output end of the No. 1 motor is equipped with a gear. During the measurement process, the air is drawn from the ventilation pipe through the fan, and discharged to the inside of the collection frame to contact the catalytic reactant, and the ring is driven by the elasticity of the spring. The push plate moves so that the collection frame can fit the air outlet of the fan, thereby ensuring the catalytic effect of the catalytic reactant. The airflow after detection is transmitted to the exhaust duct through the air collection ring, and is discharged through the exhaust duct. For the operation track of the airflow Specifically defined, during the sampling process, the operation of the No. 1 motor drives the gear to rotate, and a support point is obtained at the position of the rack to achieve the position adjustment function of the inner frame, which provides convenience for sampling and observation work.

Description

A device for measuring formaldehyde in ambient air

technical field

The invention belongs to the technical field of formaldehyde measuring equipment, in particular to measuring equipment for formaldehyde in ambient air.

Background technique

Formaldehyde measurement equipment is a detection device used to detect the formaldehyde content in the ambient air to ensure that the formaldehyde content in a certain environment can be within a safe range, so as to ensure environmental safety. In the actual use of formaldehyde measurement equipment , because the measurement method of formaldehyde measurement equipment is generally to catalyze the reaction effect of the reactant to achieve the measurement function, but the existing formaldehyde measurement equipment does not use a protective structure, resulting in insufficient reaction surface of the catalytic reactant, which is prone to deviations in the measurement effect The situation affects the accuracy of the structure determination and needs to be improved.

In view of this, the present invention is proposed.

Contents of the invention

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

A device for measuring formaldehyde in ambient air, comprising a measuring mechanism, a collecting mechanism and an adjusting mechanism. The inner side of the bit frame is rotatably connected with a roller, the inner side of the inner frame is equipped with a No. There is a fan and an exhaust duct, the bottom end of the exhaust duct is equipped with a wind collecting ring, the lower surface of the inner frame is provided with a circular groove, the inner lower surface of the outer shell is equipped with a spring, and the top of the spring A ring-shaped push plate is installed, and a collection frame is arranged on the upper surface of the ring-shaped push plate, and a catalytic reactant is installed inside the collection frame.

As a further solution of the present invention: both sides of the inner frame are provided with movable grooves, the movable grooves are sleeved on the outer surface of the limit frame, the rollers are equally spaced, and the rollers and the movable grooves fit the inner wall.

As a further solution of the present invention: the output end of the No. 1 motor penetrates to the rear end of the inner frame, and a chute is provided through the rear end of the outer shell, and the gear is slidably connected to the inner side of the chute, and the gear and The racks mesh.

As a further solution of the present invention: the inner side of the wind collecting ring is provided with a guide groove, the guide groove penetrates to the inner side of the exhaust channel, the top end of the exhaust channel penetrates to the upper surface of the inner frame, and the annular pushing The plate is located inside the guide groove and the circular groove, the annular push plate is attached to the collection frame, the input end of the fan penetrates to the upper surface of the inner frame, and the output end of the fan is inserted inside the collection frame, The collection frames fit together.

As a further solution of the present invention: the collection mechanism includes a ventilation pipe, one end of the ventilation pipe is fixedly connected to the input end of the fan, the other end of the ventilation pipe is equipped with an elastic sleeve, and the outer surface of the elastic sleeve is equipped with Elastic support strips and elastic rings, the elastic support strips are distributed at equal intervals around the circumference, the elastic support strips are fixedly connected to the elastic rings, the outer surface of the elastic ring is equipped with a mounting plate, and the surface of the mounting plate penetrates There are mounting holes.

As a further solution of the present invention: the upper surface of the inner frame is equipped with a ring-shaped slide rail, the inner side of the ring slide rail is slidingly connected with a fastener, and the lower surface of the fastener is rotatably connected with a ball, and the ball and the ring The inner walls of the slide rails are engaged, and the upper surface of the fastener is provided with a support frame.

As a further solution of the present invention: a No. 1 electric telescopic rod is installed on the inner side of the top of the support frame, and the output end of the No. 1 electric telescopic rod is rotatably connected to a No. 2 electric telescopic rod, and the output end of the No. 2 electric telescopic rod A ring piece is installed, and the ring piece is set on the outer surface of the ventilation pipe. The first connecting frame is installed on both sides of the upper surface of the No. 1 electric telescopic rod, and the outer surface of the No. 2 electric telescopic rod is equipped with two No. connecting frame, one end of said No. 2 connecting frame is rotatably connected to the inner side of No. 1 connecting frame.

As a further solution of the present invention: the adjustment mechanism includes a hollow frame, the upper surface of the hollow frame is equipped with a No. 2 motor, and the output end of the No. 2 motor is equipped with a movable frame, and the inner side of the movable frame rotates A No. 3 electric telescopic rod and a push frame are connected, and support frames are slidably connected to both sides of the outer surface of the push frame, and the support frames are installed at the four corners of the lower surface of the shell.

As a further solution of the present invention: the four corners of the outer surface of the hollow frame are rotatably connected with driving wheels, the inner side of the hollow frame is provided with a hollow box, and both sides of the hollow box are equipped with adjustment frames , the upper surface of the adjustment frame is provided with a screw hole and a through hole, one side of the hollow frame is equipped with an insertion rod, and the other side of the hollow frame is rotatably connected with a screw rod, and the through hole is sleeved on the The outer surface of the plunger, and the screw engages with the inner wall of the screw hole.

As a further solution of the present invention: the side surface of the hollow box is equipped with a pipe, one end of the pipe is inserted with a piston, the other end of the pipe is installed inside the hollow box, and the bottom of the hollow box A suction cup is installed on the surface, and an air hole is opened on the inner side of the suction cup, and one end of the air hole penetrates to the inner side of the hollow box body.

Beneficial effect:

1. Through the fan, the air is drawn from the ventilation pipe during the measurement process, and discharged into the collection frame to contact the catalytic reactant. The elasticity of the spring drives the circular push plate to move, so that the collection frame can fit the air outlet of the fan, thereby ensuring the catalytic reaction. The catalytic effect of the reactant, the airflow after detection is transmitted to the exhaust channel through the air collection ring, and is discharged through the exhaust channel. The operation track of the airflow is specifically limited. During the sampling process, the operation of the No. 1 motor drives the gear to rotate , obtain a support point at the position of the rack, achieve the position adjustment function of the inner frame, and provide convenience for sampling and observation work.

2. Through the elastic force of the elastic ring, elastic support bar and elastic sleeve itself, the elastic sleeve can be in a propped up state, so that the elastic ring can fully fit the inner wall of the tuyere, and through the connection between the No. 1 connecting frame and the No. 2 connecting frame, Adjust the angle of the No. 2 electric telescopic rod, apply force to the No. 2 electric telescopic rod through the expansion and contraction of the No. 1 electric telescopic rod, and achieve the angle adjustment function for the No. 2 electric telescopic rod, and through the expansion and contraction of the No. Adjust the position of the parts, provide the fulcrum for the ventilation pipe at different positions, and drive the ball to rotate by rotating the fastener, so that the fastener can be fully adjusted along the circular slide rail.

3. Provide structural support for the movement of the hollow frame through the driving wheel, and when the moving work is completed, apply force to the adjustment frame by rotating the screw, and limit the movement track of the adjustment frame through the insertion rod, so that the adjustment frame and the hollow frame The box moves down along the plunger, and the suction cup contacts the ground to form a negative pressure, which fixes the hollow frame. When it needs to move again, the piston is removed from the pipe and the air circulation inside the suction cup is restored through the air hole to achieve release. The position of the hollow frame can be adjusted again. Through the expansion and contraction of the No. 3 electric telescopic rod, it can drive the corresponding push frame to adjust the angle, so that the top of the push frame slides inside the support frame, and adjusts the height of the shell. Adjustment, and after the adjustment is completed, the position of the support frame can be further adjusted in the plane along the top of the push frame by means of pushing, and the operation of the second motor drives the movable frame to rotate to adjust the facing direction of the shell.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

In the attached picture:

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention;

Fig. 2 is the schematic diagram of measuring mechanism of the present invention;

Fig. 3 is the explosion schematic diagram of measuring mechanism of the present invention;

Fig. 4 is a schematic diagram of the collection mechanism of the present invention;

Figure 5 is a schematic diagram of the explosion of the collection mechanism of the present invention;

Fig. 6 is the enlarged schematic view of A place of Fig. 5 of the present invention;

Fig. 7 is a schematic diagram of the adjustment mechanism of the present invention;

Fig. 8 is a schematic exploded view of the adjustment mechanism of the present invention.

In the figure: 1. shell; 2. inner frame; 3. limit frame; 4. roller; 5. No. 1 motor; 6. gear; 7. rack; 8. fan; 9. exhaust duct; 10. Air ring; 11, spring; 12, annular push plate; 13, collection frame; 14, ventilation pipe; 15, elastic sleeve; 16, elastic support bar; 17, elastic ring; 18, annular slide rail; 19, fastener; 20. Ball; 21. Support frame; 22. No. 1 electric telescopic rod; 23. No. 2 electric telescopic rod; 24. No. 1 connecting frame; 25. No. 2 connecting frame; 26. Ring piece; 27. Hollow frame; 28. No. 2 motor; 29. Movable frame; 30. Push frame; 31. No. 3 electric telescopic rod; 32. Support frame; 33. Driving wheel; 34. Screw rod; 35. Inserting rod; 36. Hollow box; 37 , adjusting frame; 38, suction cup; 39, pipe fittings.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention .

As shown in Figures 1 to 3, a device for measuring formaldehyde in ambient air includes a housing 1, an inner frame 2 is arranged on the inside of the housing 1, a limit frame 3 is installed on the inside of the shell 1, and the inside of the limit frame 3 rotates A roller 4 is connected, a No. 1 motor 5 is installed on the inside of the inner frame 2, a gear 6 is installed on the output end of the No. 1 motor 5, a rack 7 is installed on the rear end of the shell 1, and a fan 8, row Air channel 9 and the bottom of exhaust channel 9 are equipped with wind collecting ring 10, the lower surface of inner frame 2 is provided with circular groove, the inner lower surface of shell 1 is equipped with spring 11, and the top of spring 11 is equipped with annular push plate 12. The upper surface of the annular push plate 12 is provided with a collection frame 13, and the inner side of the collection frame 13 is equipped with a catalytic reactant.

Through the fan 8, the air is extracted from the ventilation pipe 14 during the measurement process, and discharged to the inside of the collection frame 13 to contact with the catalytic reactant, and the elasticity of the spring 11 drives the annular push plate 12 to move, so that the collection frame 13 can fit the output of the fan 8 The tuyere, and then ensure the catalytic effect of the catalytic reactant. The air flow after detection is passed to the exhaust channel 9 through the air collecting ring 10, and is discharged through the exhaust channel 9. The operating track of the air flow is specifically limited. During the sampling process, through The operation of the No. 1 motor 5 drives the gear 6 to rotate, and obtains a supporting point at the position of the rack 7, thereby achieving the function of adjusting the position of the inner frame 2 and providing convenience for sampling and observation.

Specifically, as shown in Figure 3, both sides of the inner frame 2 are provided with movable grooves, the movable grooves are sleeved on the outer surface of the limit frame 3, and the rollers 4 are equally spaced, and the rollers 4 and the inner wall of the movable groove fit together.

The movable track of the limit frame 3 is limited by the movable groove, the movement of the inner frame 2 is made more flexible by the roller 4, and the lifting track of the inner frame 2 is further limited.

Specifically, as shown in Figure 2, the output end of the No. 1 motor 5 runs through to the rear end of the inner frame 2, the rear end of the casing 1 is provided with a chute, and the gear 6 is slidably connected to the inner side of the chute. Bar 7 meshes.

The gear 6 is driven to rotate by the operation of the No. 1 motor 5, and a supporting point is obtained at the position of the rack 7, thereby achieving the position adjustment function of the inner frame 2 and providing convenience for sampling and observation.

Specifically, as shown in FIG. 3 , a guide groove is provided on the inner side of the wind collecting ring 10, the guide groove penetrates to the inner side of the exhaust passage 9, the top of the exhaust passage 9 penetrates to the upper surface of the inner frame 2, and the annular push plate 12 Located inside the guide groove and the circular groove, the annular push plate 12 fits the collection frame 13, the input end of the fan 8 penetrates to the upper surface of the inner frame 2, and the output end of the fan 8 is inserted inside the collection frame 13, and the collection Frames 13 fit together.

Through the fan 8, the air is extracted from the ventilation pipe 14 during the measurement process, and discharged to the inside of the collection frame 13 to contact with the catalytic reactant, and the elasticity of the spring 11 drives the annular push plate 12 to move, so that the collection frame 13 can fit the output of the fan 8 The tuyere ensures the catalytic effect of the catalytic reactant. The airflow after detection is transmitted to the exhaust channel 9 through the air collecting ring 10, and is discharged through the exhaust channel 9. The operation trajectory of the airflow is specifically limited.

Specifically, as shown in Figures 4 to 5, the collection mechanism includes a ventilation pipe 14, one end of the ventilation pipe 14 is fixedly connected to the input end of the fan 8, and the other end of the ventilation pipe 14 is equipped with an elastic sleeve 15, and the outer surface of the elastic sleeve 15 is The surface is equipped with elastic support strips 16 and elastic rings 17, which are circumferentially equidistantly distributed between the elastic support strips 16. The elastic support strips 16 are fixedly connected with the elastic rings 17, and the outer surface of the elastic rings 17 is equipped with a mounting plate, and the surface of the mounting plate A mounting hole is formed through the opening.

Through the elastic force of the elastic ring 17, the elastic support bar 16 and the elastic sleeve 15 itself, the elastic sleeve 15 can be in a propped up state, so that the elastic ring 17 can fully fit the inner wall of the tuyere, and screws are driven into the mounting holes to be in contact with the fixed surface. connection, the position of the elastic sleeve 15 can be fixed.

Specifically, as shown in Figure 6, the upper surface of the inner frame 2 is equipped with an annular slide rail 18, the inner side of the annular slide rail 18 is slidably connected with a fastener 19, and the lower surface of the fastener 19 is rotatably connected with a ball 20, and the ball 20 and the The inner walls of the annular slide rail 18 are engaged, and the upper surface of the fastener 19 is equipped with a support frame 21 .

The ball 20 is driven to rotate by rotating the fastener 19, so that the fastener 19 can be fully adjusted along the annular slide rail 18, and the rotation of the ball 20 makes the fastener 19 move more smoothly.

Concretely, as shown in Figure 7, No. 1 electric telescopic rod 22 is installed on the inner side of the top of support frame 21, and the output end of No. 1 electric telescopic rod 22 is connected with No. The end is equipped with a ring piece 26, and the ring piece 26 is sleeved on the outer surface of the ventilation pipe 14. The first connecting frame 24 is equipped with both sides of the upper surface of the No. 1 electric telescopic rod 22, and the outer surface of the No. 2 electric telescopic rod 23 is equipped with No. 2 connecting frame 25 , one end of No. 2 connecting frame 25 is rotatably connected to the inner side of No. 1 connecting frame 24 .

Through the connection of the No. 1 connecting frame 24 and the No. 2 connecting frame 25, the angle of the No. 2 electric telescopic rod 23 is adjusted, and the expansion and contraction of the No. 1 electric telescopic rod 22 applies force to the No. 2 electric telescopic rod 23. The angle adjustment function of the electric telescopic rod 23 adjusts the position of the ring member 26 through the expansion and contraction of the No. 2 electric telescopic rod 23, and provides a fulcrum for the ventilation pipe 14 at different positions.

Specifically, as shown in Figure 7, the adjustment mechanism includes a hollow frame 27, the upper surface of the hollow frame 27 is equipped with a second motor 28, and the output end of the second motor 28 is equipped with a movable frame 29, and the inner side of the movable frame 29 rotates No. three electric telescopic rod 31 and push frame 30 are connected, and both sides of the outer surface of push frame 30 are slidably connected with support frame 32, and support frame 32 is contained in the four corners of the lower surface of shell 1.

Through the expansion and contraction of the No. 3 electric telescopic rod 31, the corresponding push frame 30 can be driven to adjust the angle, so that the top of the push frame 30 slides inside the support frame 32, and the height of the shell 1 is adjusted. After the adjustment is completed, it can also be adjusted by The way of pushing is to further adjust the position of the support frame 32 along the top of the push frame 30, and the operation of the second motor 28 drives the movable frame 29 to rotate to adjust the facing direction of the shell 1.

Specifically, as shown in Figure 8, the four corners of the outer surface of the hollow frame 27 are rotatably connected with driving wheels 33, the inner side of the hollow frame 27 is provided with a hollow box body 36, and both sides of the hollow box body 36 are equipped with adjusting Frame 37, the upper surface of adjusting frame 37 is provided with screw hole and through hole, and one side of hollow frame 27 is equipped with inserting rod 35, and the other side of hollow frame 27 is connected with screw rod 34 in rotation, and through hole is set on inserting The outer surface of the rod 35, the screw 34 engages with the inner wall of the screw hole.

The movement of the hollow frame 27 is provided with structural support by the driving wheel 33, and when the moving work is completed, the adjustment frame 37 is exerted force by rotating the screw rod 34, and the movable track of the adjustment frame 37 is limited by the insertion rod 35, so that The adjusting frame 37 and the hollow box body 36 move down along the inserting rod 35, and the suction cup 38 contacts with the ground to form a negative pressure, and the hollow frame 27 is fixed.

Specifically, as shown in Figure 8, the side surface of the hollow box 36 is equipped with a pipe fitting 39, one end of the pipe fitting 39 is inserted with a piston, the other end of the pipe fitting 39 is installed inside the hollow box 36, and the bottom of the hollow box 36 A suction cup 38 is installed on the surface, and the inner side of the suction cup 38 is provided with an air hole, and one end of the air hole penetrates to the inner side of the hollow box body 36 .

When it needs to move again, the position of the hollow frame 27 can be adjusted again by removing the piston from the pipe fitting 39 and restoring the air circulation inside the suction cup 38 through the air holes to achieve a pressure relief effect.

working principle:

The movement of the hollow frame 27 is provided with structural support by the driving wheel 33, and when the moving work is completed, the adjustment frame 37 is exerted force by rotating the screw rod 34, and the movable track of the adjustment frame 37 is limited by the insertion rod 35, so that The adjustment frame 37 and the hollow box body 36 move down along the insert rod 35, and the suction cup 38 contacts the ground to form a negative pressure, which forms a fixation on the hollow frame 27. When it needs to move again, the piston is removed from the pipe fitting 39 and passed The air hole restores the air circulation inside the suction cup 38 to achieve the pressure relief effect, and the position of the hollow frame 27 can be adjusted again. Through the expansion and contraction of the No. 3 electric telescopic rod 31, the corresponding push frame 30 can be driven to adjust the angle, so that the push frame The top of the frame 30 slides inside the support frame 32 to adjust the height of the shell 1. After the adjustment is completed, the position of the support frame 32 can be further adjusted along the top of the push frame 30 by pushing. The operation of 28 drives the movable frame 29 to rotate, and the facing direction of the shell 1 is adjusted. Through the elastic force of the elastic ring 17, the elastic support bar 16 and the elastic sleeve 15 itself, the elastic sleeve 15 can be in a propped state, so that the elastic ring 17 can Fully fit the inner wall of the tuyere, through the connection of the No. 1 connecting frame 24 and the No. 2 connecting frame 25, the angle of the No. 2 electric telescopic rod 23 is adjusted, and the expansion and contraction of the No. 2 electric telescopic rod 23 is adjusted. Apply force to achieve the angle adjustment function for the No. 2 electric telescopic rod 23, and adjust the position of the ring 26 through the expansion and contraction of the No. 2 electric telescopic rod 23, and provide fulcrums for the ventilation pipe 14 at different positions. By rotating the fastener 19 The way to drive the ball 20 to rotate, so that the fastener 19 can be fully adjusted along the annular slide rail 18, through the fan 8, the air is drawn from the ventilation pipe 14 during the measurement process, and discharged to the inside of the collection frame 13 to contact with the catalytic reactant. The elasticity of 11 drives the annular push plate 12 to move, so that the collection frame 13 can fit the air outlet of the fan 8, thereby ensuring the catalytic effect of the catalytic reactant. The exhaust channel 9 is exhausted, and the operation trajectory of the airflow is specifically limited. During the sampling process, the operation of the No. 1 motor 5 drives the gear 6 to rotate, and a support point is obtained at the position of the rack 7 to achieve the position adjustment function of the inner frame 2 , to provide convenience for sampling and observation work.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their effects.

Claims (10)

1. The utility model provides a survey equipment of formaldehyde in ambient air, includes survey mechanism, collection mechanism and adjustment mechanism, its characterized in that, survey mechanism includes shell (1), the inboard of shell (1) is provided with interior frame (2), the inboard of shell (1) is equipped with spacing (3), the inboard rotation of spacing (3) is connected with gyro wheel (4), motor (5) are equipped with to the inboard of interior frame (2), gear (6) are equipped with to the output of motor (5), rack (7) are equipped with to the rear end of shell (1), fan (8), exhaust passage (9) are equipped with to the inboard of interior frame (2), the bottom of exhaust passage (9) is equipped with collection wind ring (10), the lower surface of interior frame (2) runs through and has seted up the circular slot, the inboard lower surface of shell (1) is equipped with spring (11), annular push pedal (12) are equipped with to the top of spring (11), the upper surface of annular push pedal (12) is provided with gathers frame (13), the inboard of gathering frame (13) is equipped with catalytic reaction agent.

2. The apparatus for determining formaldehyde in ambient air according to claim 1, wherein the inner frame (2) has movable grooves formed on both sides thereof, the movable grooves are sleeved on the outer surface of the limiting frame (3), the rollers (4) are arranged at equal intervals, and the rollers (4) are attached to the inner walls of the movable grooves.

3. The apparatus for determining formaldehyde in ambient air according to claim 1, wherein the output end of the first motor (5) penetrates the rear end of the inner frame (2), the rear end of the outer shell (1) penetrates a sliding groove, the gear (6) is slidably connected to the inner side of the sliding groove, and the gear (6) is meshed with the rack (7).

4. The apparatus for determining formaldehyde in ambient air according to claim 1, wherein a guide groove is formed in the inner side of the air collecting ring (10), the guide groove penetrates through the inner side of the air exhaust passage (9), the top end of the air exhaust passage (9) penetrates through the upper surface of the inner frame (2), the annular push plate (12) is located in the inner side of the guide groove and the circular groove, the annular push plate (12) is attached to the collecting frame (13), the input end of the fan (8) penetrates through the upper surface of the inner frame (2), the output end of the fan (8) is inserted into the inner side of the collecting frame (13), and the collecting frames (13) are attached to each other.

5. The apparatus for determining formaldehyde in ambient air according to claim 1, wherein the collecting mechanism comprises a ventilation pipe (14), one end of the ventilation pipe (14) is fixedly connected with the input end of the fan (8), the other end of the ventilation pipe (14) is provided with an elastic sleeve (15), the outer surface of the elastic sleeve (15) is provided with elastic support bars (16) and elastic rings (17), the elastic support bars (16) are distributed at equal intervals in the circumferential direction, the elastic support bars (16) are fixedly connected with the elastic rings (17), the outer surface of the elastic rings (17) is provided with a mounting plate, and the surface of the mounting plate is provided with mounting holes in a penetrating manner.

6. The apparatus for determining formaldehyde in ambient air according to claim 1, wherein the upper surface of the inner frame (2) is provided with an annular slide rail (18), a fastener (19) is slidably connected to the inner side of the annular slide rail (18), the lower surface of the fastener (19) is rotatably connected with a ball (20), the ball (20) is engaged with the inner wall of the annular slide rail (18), and the upper surface of the fastener (19) is provided with a support frame (21).

7. The apparatus for determining formaldehyde in ambient air according to claim 6, wherein a first electric telescopic rod (22) is mounted on the inner side of the top end of the support frame (21), an output end of the first electric telescopic rod (22) is rotatably connected with a second electric telescopic rod (23), an output end of the second electric telescopic rod (23) is provided with a ring piece (26), the ring piece (26) is sleeved on the outer surface of the ventilation pipe (14), first connecting frames (24) are mounted on two sides of the upper surface of the first electric telescopic rod (22), a second connecting frame (25) is mounted on the outer surface of the second electric telescopic rod (23), and one end of the second connecting frame (25) is rotatably connected to the inner side of the first connecting frame (24).

8. The apparatus for determining formaldehyde in ambient air according to claim 1, wherein the adjusting mechanism comprises a hollow frame (27), a second motor (28) is mounted on the upper surface of the hollow frame (27), a movable frame (29) is mounted at the output end of the second motor (28), a third electric telescopic rod (31) and a pushing frame (30) are rotatably connected to the inner side of the movable frame (29), supporting frames (32) are slidably connected to two sides of the outer surface of the pushing frame (30), and the supporting frames (32) are mounted at four corners of the lower surface of the housing (1).

9. The apparatus for determining formaldehyde in ambient air according to claim 8, wherein four corners of the outer surface of the hollow frame (27) are rotatably connected with driving wheels (33), the inner side of the hollow frame (27) is provided with a hollow box body (36), adjusting frames (37) are arranged on two sides of the hollow box body (36), screw holes and through holes are formed in the upper surface of each adjusting frame (37), an inserting rod (35) is arranged on one side of the hollow frame (27), the other side of the hollow frame (27) is rotatably connected with a screw rod (34), the through holes are sleeved on the outer surface of the inserting rod (35), and the screw rod (34) is meshed with the inner wall of each screw hole.

10. The apparatus for determining formaldehyde in the ambient air according to claim 9, wherein a pipe member (39) is installed on a side surface of the hollow box body (36), a piston is inserted into one end of the pipe member (39), the other end of the pipe member (39) is installed inside the hollow box body (36), a suction cup (38) is installed on a lower surface of the hollow box body (36), an air hole is formed on the inside of the suction cup (38), and one end of the air hole penetrates through the inside of the hollow box body (36).

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