Sampling equipment for automatic fluoride analyzer

Abstract

The present invention discloses a sampling device for an automatic fluoride determination instrument, comprising a box body, a movable clamping plate is arranged in the box body, a sealing top plate is connected and arranged below the movable clamping plate, a detection film slot is formed between the movable clamping plate and the top of the inner wall of the sampling box body and between the movable clamping plate and the sealing top plate, respectively, and the sealing top plate and the movable clamping plate are driven up and down by a sealing driving mechanism; a sampling structure and a blank test structure are arranged side by side at the top of the box body, and the detection film slot includes two detection film slots a and two detection film slots b; a sampling suction mechanism is arranged in communication with the detection film slot a. The present invention mainly performs automatic and continuous sampling of fluoride in ambient air by a filter membrane sampling method, and the blank test structure can effectively eliminate the possibility that the ambient air automatically enters the device and affects the experimental results, and can effectively ensure the accuracy of the experimental results.

Description

Technical Field

[0001] The present invention relates to the technical field of air quality monitoring, in particular to a sampling device for an automatic fluoride measuring instrument, which is mainly suitable for collecting gaseous and particulate fluorides in the air. Background Art

[0002] There are two types of fluoride in the ambient air: gaseous fluorine and dusty fluorine. Gaseous fluorine is mainly hydrogen fluoride. Fluorine-containing dust is mainly cryolite, fluorite, aluminum fluoride and phosphate lime. Pollution mainly comes from gases and dust emitted or released from electrolytic aluminum plants, phosphate fertilizer plants and cryolite plants. The concentration of hydrogen fluoride in humans is 400-430 mg / m 3 Low concentrations can cause acute poisoning and lead to death. Long-term inhalation of low concentrations of fluorine and its compound gases and dust can affect the normal physiological functions of various tissues and organs, and even cause chronic fluorosis and skeletal fluorosis. Therefore, it is very important to accurately measure fluorine pollution in the ambient air.

[0003] Existing ambient air fluoride sampling equipment is independent and can only perform manual sampling but not automatic continuous sampling. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sampling device for a fluoride automatic measuring instrument to solve the problem that the existing sampling device cannot perform automatic continuous sampling, so as to realize continuous sampling of the sampling device.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0006] The invention relates to a sampling device for an automatic fluoride analyzer, comprising a box body, wherein a movable splint is provided in the box body, a sealing top plate is connected to the bottom of the movable splint, a detection membrane card slot for containing a filter membrane clip is formed between the movable splint and the top of the inner wall of the sampling box body and between the movable splint and the sealing top plate, respectively. The sealing top plate and the movable splint are driven up and down by a sealing drive mechanism, and the sealing drive mechanism is provided in the box body; a sampling structure for performing environmental gas filtration sampling and a blank test structure having the same structure as the sampling structure and for performing a blank control test are arranged side by side at the top of the box body, the detection membrane card slot comprises two detection membrane card slots a connected to the sampling structure and two detection membrane card slots b connected to the blank test structure; a sampling suction mechanism for sucking environmental air so that the sampling structure performs sampling is provided in communication with the detection membrane card slot a; the sampling device further comprises a controller, and the controlled ends of the sampling suction mechanism and the sealing drive mechanism are respectively connected to the output end of the controller.

[0007] To further optimize the technical solution, the sealing drive mechanism includes a steering air duct fixedly arranged at the bottom end of the sealing top plate and a lifting mechanism arranged below the steering air duct for driving the steering air duct and the sealing top plate to rise and fall. Two through holes connected to the detection membrane slot a and the detection membrane slot b are respectively provided on the sealing top plate. The steering air duct is located directly below the detection membrane slot a and is connected to the detection membrane slot a. The controlled end of the lifting mechanism is connected to the output end of the controller.

[0008] To further optimize the technical solution, the lifting mechanism includes a screw rotatably arranged on the bottom wall of the box, a nut arranged in the box and matched with the screw, and a drive motor connected to one end of the screw extending out of the box, and the controlled end of the drive motor is connected to the output end of the controller; a first transverse plate is fixedly arranged at the bottom end of the side wall of the steering air duct, the nut is fixedly connected to a nut connecting plate, and a guide roller is detachably arranged at the bottom end of the inner wall of the box, which moves through the nut connecting plate and the first transverse plate in sequence, and a first spring is fixedly arranged between the top end of the nut connecting plate and the bottom end of the first transverse plate and is sleeved on the outside of the guide roller.

[0009] To further optimize the technical solution, a plurality of second guide rollers that move through the movable clamping plate are fixedly provided on the top of the sealing top plate, and a second spring that is sleeved on the outside of the second guide roller is connected between the sealing top plate and the movable clamping plate.

[0010] To further optimize the technical solution, a plurality of vertically arranged movable guide rails are detachably connected to the box body, and the sealing top plate passes through the movable guide rails and can slide up and down along the movable guide rails.

[0011] To further optimize the technical solution, the sampling and suction mechanism includes a spring air duct connected to the steering air duct, an exhaust duct connected to the spring air duct, and a sampling pump connected to the exhaust duct, and the controlled end of the sampling pump is connected to the output end of the controller.

[0012] To further optimize the technical solution, a flow meter for counting the gas collection flow is provided on the side of the exhaust duct, and the output end of the flow meter is connected to the input end of the controller.

[0013] To further optimize the technical solution, a limiter for limiting the moving position of the sealing top plate is fixedly provided on the inner side wall of the box body, and the output end of the limiter is connected to the input end of the controller.

[0014] To further optimize the technical solution, filter membrane support structures are respectively provided inside the sampling structure and the blank test structure.

[0015] To further optimize the technical solution, a plurality of protrusions are fixedly provided on the top of the movable splint, and a plurality of grooves respectively matched with the protrusions are opened on the top of the inner wall of the box.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is as follows.

[0017] The present invention mainly performs automatic and continuous sampling of fluoride in ambient air by a membrane sampling method. The blank test structure can effectively eliminate the possibility that ambient air automatically enters the device and affects the experimental results, thereby effectively ensuring the accuracy of the experimental results.

[0018] The movable clamping plate of the present invention can move up and down by being driven by a sealing driving mechanism, thereby opening and closing the detection membrane clamping slot, so that the filter membrane clamp can be automatically replaced and placed.

[0019] A limiter is fixedly provided on the inner side wall of the box body of the present invention, and the limiter is used to limit the moving position of the sealing top plate. When the sealing top plate moves upward and touches the limiter, the limiter will feed back the position signal of the sealing top plate at this time to the controller, and then the controller controls the sealing top plate to stop moving upward, thereby achieving a good limiting effect.

[0020] The present invention can realize automatic continuous sampling and record and control flow without manual supervision. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the present invention;

[0023] Figure 3 A top view of the present invention;

[0024] Figure 4 It is a side view of the present invention.

[0025] Wherein: 1. Box body, 11. Groove, 2. Sampling structure, 21. Sampling air inlet pipe, 3. Blank test structure, 31. Blank test air inlet pipe, 4. Movable splint, 41. Detection membrane slot, 42. Protrusion, 5. Sealing drive mechanism, 52. Moving guide rail, 53. Steering air duct, 531. First transverse plate, 532. Second transverse plate, 54. Lead screw, 55. Nut, 56. Drive motor, 57. Guide roller, 58. First spring, 59. Second guide roller, 510. Second spring, 511. Nut connecting plate, 6. Sampling suction mechanism, 61. Spring air duct, 62. Exhaust duct, 63. Connector, 7. Flow meter, 8. Limiter, 9. Sealing top plate. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to specific embodiments.

[0027] A sampling device for a fluoride automatic analyzer, combined with Figures 1 to 4 As shown, it includes a box body 1, a movable splint 4, a detection membrane slot 41, a sealing drive mechanism 5, a sampling structure 2, a blank test structure 3, a sampling suction mechanism 6 and a controller.

[0028] The device is fixed on the main board of the instrument as a whole. The controller in the present invention is a PLC controller.

[0029] The box body 1 is surrounded by a supporting frame, and the interior of the box body 1 is hollow.

[0030] A movable clamping plate 4 is disposed within the housing 1, with a sealing top plate 9 connected to its lower portion. The sealing top plate 9 and movable clamping plate 4 are driven up and down by a sealing drive mechanism 5 disposed within the housing 1. Detection membrane holder slots 41 for holding filter membrane holders are formed between the movable clamping plate 4 and the top end of the inner wall of the sampling housing 1, and between the movable clamping plate 4 and the sealing top plate 9, respectively.

[0031] The top of the movable clamping plate 4 is fixed with a plurality of protrusions 42, and the top of the inner wall of the box body 1 is provided with a plurality of grooves 11 that respectively cooperate with the protrusions 42. When the sealing drive mechanism 5 drives the movable clamping plate 4 upward, the protrusions 42 can enter the grooves 11, thereby forming two detection membrane clamping grooves between the top of the movable clamping plate 4 and the top of the inner wall of the sampling box body 1 to clamp and seal the filter membrane clamp. At the same time, two detection membrane clamping grooves are formed between the movable clamping plate 4 and the sealing top plate 9.

[0032] The sampling device can accommodate four filter membrane holders simultaneously. Two can be placed on the upper side of the movable clamping plate 4, with a blank test filter membrane holder on the left and a sampling filter membrane holder on the right. Two can be placed on the lower side of the movable clamping plate 4, also with a blank test filter membrane holder on the left and a sampling filter membrane holder on the right. By pulling the movable clamping plate 4 and the sealing top plate 9 downward, the filter membrane holders can be added step by step. By pushing the movable clamping plate 4 and the sealing top plate 9 upward, all four filter membrane holders are simultaneously tightened and sealed.

[0033] The top of the box 1 is provided with a sampling structure 2 and a blank test structure 3. The sampling structure 2 is used for filtering and sampling ambient gas. The blank test structure 3 is identical to the sampling structure 2 and is used for blank control experiments.

[0034] There are four test membrane slots 41, including a test membrane slot a connected to the sampling structure 2 and a test membrane slot b connected to the blank test structure 3. The filter membrane holders placed in the upper and lower test membrane slots b on the left are used as full-time blanks, while the filter membrane holders placed in the upper and lower test membrane slots a on the right are used for actual samples.

[0035] The sampling structure 2 includes a sampling air inlet pipe 21, which is arranged at the top of the box body 1 and is connected to the detection membrane card slot a.

[0036] The blank test structure 3 includes a blank test air inlet pipe 31 . The blank test air inlet pipe 31 is arranged at the top of the box body 1 and is connected to the detection membrane card slot b.

[0037] The sampling structure 2 and the blank test structure 3 are respectively provided with filter membrane support structures, that is, the filter membrane support structures are respectively provided inside the sampling air inlet pipe 21 and the blank test air inlet pipe 31 .

[0038] The membrane support structure includes a membrane mesh pad and a spacer ring. The membrane mesh pad is provided with two layers, upper and lower, and is made of stainless steel. The two layers of the membrane mesh pad are separated by a spacer ring.

[0039] The sealing drive mechanism 5 includes a steering air duct 53 and a lifting mechanism. The controlled end of the sealing drive mechanism 5 is connected to the output end of the controller. The sealing drive mechanism 5 is used to drive the sealing top plate 9 and the movable clamping plate 4 to move up and down, thereby opening and closing the detection membrane clamp slot to facilitate the replacement and placement of the filter membrane clamp.

[0040] The sealing top plate 9 is connected to the bottom end of the movable clamping plate 4. A plurality of second guide rollers 59 are fixedly provided on the top end of the sealing top plate 9 and are movable through the movable clamping plate 4. A second spring 510 is connected between the sealing top plate 9 and the movable clamping plate 4 and is sleeved on the outside of the second guide rollers 59.

[0041] The diverting air duct 53 is fixedly mounted at the bottom of the sealing top plate 9 and is located directly below the sampling structure 2. The sealing top plate 9 has two through holes connected to the detection membrane slot a and the detection membrane slot b, respectively. The diverting air duct 53 is located directly below the detection membrane slot a and is connected to the detection membrane slot a.

[0042] The lifting mechanism is arranged below the steering air duct 53 and is used to drive the steering air duct 53 and the sealing top plate 9 to rise and fall. The controlled end of the lifting mechanism is connected to the output end of the controller.

[0043] The lifting mechanism includes a lead screw 54, a nut 55, and a drive motor 56. The lead screw 54 is rotatably mounted on the bottom wall of the housing 1. It is vertically positioned, with its top end extending into the interior of the housing 1. The nut 55 is located within the housing 1 and is mated to the lead screw 54. The drive motor 56 is connected to the end of the lead screw 54 that extends beyond the housing 1. The controlled end of the drive motor 56 is connected to the output of the controller.

[0044] The nut 55 is connected to a nut connecting plate 511 by screws. A first transverse plate 531 is fixedly provided at the bottom end of the side wall of the turning air duct 53, and a second transverse plate 532 is fixedly provided at the top end of the side wall of the turning air duct 53. A guide roller 57 is detachably provided at the bottom end of the inner wall of the box body 1, which moves through the nut connecting plate 511 and the first transverse plate 531 in sequence. The bottom end of the guide roller 57 is connected to the box body 1 by bolts, and the top end of the guide roller 57 extends between the first transverse plate 531 and the second transverse plate 532, and the top end is not connected to the second transverse plate 532. A first spring 58 is fixedly provided between the top end of the nut connecting plate 511 and the bottom end of the first transverse plate 531 and is sleeved on the outside of the guide roller 57.

[0045] Several vertically arranged movable guide rails 52 are detachably connected in the box body 1. The sealing top plate 9 passes through the movable guide rails 52 and can slide up and down along the movable guide rails 52. The setting of the sealing top plate 9 makes the movable guide rails 52 more stable when moving up and down without deflection.

[0046] The sampling structure 2 and the detection membrane slot a are connected to a sampling suction mechanism 6, which is used to draw ambient air to achieve the sampling structure's sampling purpose. The controlled end of the sampling suction mechanism 6 is connected to the output of the controller. The blank test structure 3 on the left is not connected to the sampling suction mechanism 6, thereby achieving the purpose of a blank test.

[0047] The sampling and suction mechanism 6 includes a spring air duct 61 connected to the steering air duct 53, an exhaust pipe 62 connected to the spring air duct 61, and a sampling pump connected to the exhaust pipe 62. The controlled end of the sampling pump is connected to the output end of the controller. A connector 63 is provided at one end of the exhaust pipe 62, and the sampling pump and connector 63 are connected by a connecting pipe.

[0048] When the load at the air inlet end is less than 20kPa, the sampling pump can ensure that the flow rate range is adjustable from 10L / min to 60L / min.

[0049] The filter membrane holder equipped with a filter membrane near one end of the spring air duct 61 is used to sample fluoride in the air, and the filter membrane holder equipped with a filter membrane at the other end is used to make laboratory blank and full-process blank.

[0050] A flow meter 7 for counting the gas flow rate is connected to the side of the exhaust duct 62. The output end of the flow meter 7 is connected to the input end of the controller. The flow meter 7 in the present invention is a mass flow meter.

[0051] A limiter 8 is fixedly mounted on the inner wall of the housing 1. This limiter 8 is used to limit the movement of the sealing top plate 9. The output of the limiter 8 is connected to the input of the controller. The limiter 8 is a travel switch. When the sealing top plate 9 moves upward and touches the limiter 8, the limiter 8 feeds back a position signal of the sealing top plate 9 to the controller, which then stops the sealing top plate 9 from moving upward, achieving a good limiting effect.

[0052] The present invention is mainly applicable to the collection of gaseous and particulate fluorides in the air. The sampling flow rate can be set arbitrarily between 10L / min and 60L / min under a load of less than 20kPa at the air inlet end. The sampling time can be set arbitrarily between 1min and 99h, or between 1 and 999m. 3 The gas collection volume under standard conditions can be set arbitrarily.

[0053] When the present invention is actually sampling, the controller controls the sampling pump to start, and the sampling pump performs a suction operation. The air in the environment is sucked into the interior of the device from the sampling air inlet pipe 21. The filter membrane support structure in the sampling air inlet pipe 21 filters the inhaled air. The filtered air passes through the filter membrane clamp clamped in the detection membrane slot 41, and the filter membrane in the filter membrane clamp absorbs the fluoride in the air, so that the sampling pump draws air to adsorb the sample in the air on the two layers of filter membranes. The absorbed air enters the spring air duct 61, and then passes through the flow meter 7. The flow meter 7 counts the air flow passing through.

[0054] At the same time, the blank test structure 3 provided in the present invention can effectively eliminate the possibility that the air in the environment automatically enters the sampling air inlet pipe 21 and affects the experimental results, and can effectively ensure the accuracy of the experimental results.

[0055] When the present invention is replacing or removing the filter membrane clamp, the controller controls the drive motor 56 to operate, the drive motor 56 drives the lead screw 54 to rotate, the lead screw 54 drives the nut 55 and the nut connecting plate 511 fixed to the nut 55 to move downward, and when the nut connecting plate 511 moves downward, it pulls the first spring 58 downward, and the first spring 58 pulls the first transverse plate 531, the turning air duct 53 and the sealing top plate 9 downward, and the sealing top plate 9 pulls the movable splint 4 downward through the second spring 510, thereby opening the detection membrane slot a and the detection membrane slot b, and the filter membrane clamp is replaced or removed at this time.

[0056] By pulling the sealing top plate 9 and the movable splint 4 downward through the sealing drive mechanism 5, the film storage bin has two gears, one gear is aligned with the detection membrane slot a between the movable splint 4 on the left and the top of the inner wall of the box body 1, and the other gear is aligned with the detection membrane slot b between the movable splint 4 on the right and the sealing top plate 9, and then combined with the lateral movement of the filter membrane clamp automatic pushing device, the filter membrane clamp in any film storage bin (a total of two film storage bins) can be pushed into any sampling station (a total of four stations, and the sampling stations are all glued with silicone sheets for sealing on the top and bottom).

[0057] After the filter membrane clamp is replaced, the controller controls the drive motor 56 to operate in reverse. The drive motor 56 drives the lead screw 54 to rotate. The lead screw 54 drives the nut 55 and the nut connecting plate 511 fixed to the nut 55 to move upward, and can make the first spring 58 and the second spring 510 in a compressed state. When the sealing top plate 9 moves upward to a certain position, it will touch the limiter 8. The limiter 8 will feed back the position information of the sealing top plate 9 at this time to the controller, and then the controller will control the sealing top plate 9 to stop moving upward. At this time, the filter membrane clamp is tightly clamped. Push upward through the sealing drive mechanism 5 until the seal is ensured. The sampling suction mechanism 6 starts working, and the flowmeter 7 controls and records the flow.

[0058] Finally, the filter membrane in the filter membrane holder after collection is sheared, extracted, detected and analyzed by a shearing device, a reaction device and an analysis device to obtain the fluoride concentration information of the solution and convert it into the fluoride concentration value in the air.

Claims

1. A sampling device for an automatic fluoride analyzer, comprising a housing (1), characterized in that: A movable clamping plate (4) is arranged in the box body (1), and a sealing top plate (9) is connected to the bottom of the movable clamping plate (4). A detection membrane clamping groove (41) for containing a filter membrane clamp is formed between the movable clamping plate (4) and the top of the inner wall of the sampling box body (1) and between the movable clamping plate (4) and the sealing top plate (9). The sealing top plate (9) and the movable clamping plate (4) are moved up and down by the driving of a sealing driving mechanism (5), and the sealing driving mechanism (5) is arranged in the box body (1); a sampling mechanism for filtering and sampling environmental gases is arranged side by side at the top of the box body (1). The invention relates to a sampling device for performing a blank control test and a sampling structure (2) and a blank test structure (3) having the same structure as the sampling structure (2), wherein the detection membrane slot (41) comprises two detection membrane slots a connected to the sampling structure (2) and two detection membrane slots b connected to the blank test structure (3); the sampling structure (2) and the detection membrane slots a are connected to each other and are provided with a sampling suction mechanism (6) for sucking ambient air so that the sampling structure can perform sampling; the sampling device also comprises a controller, and the controlled ends of the sampling suction mechanism (6) and the sealing drive mechanism (5) are respectively connected to the output end of the controller.

2. The sampling device for the fluoride automatic analyzer according to claim 1, characterized in that: The sealing drive mechanism (5) comprises a steering air duct (53) fixedly arranged at the bottom end of the sealing top plate (9) and a lifting mechanism arranged below the steering air duct (53) for driving the steering air duct (53) and the sealing top plate (9) to move up and down. The sealing top plate (9) is provided with two through holes respectively connected to the detection membrane card slot a and the detection membrane card slot b. The steering air duct (53) is located directly below the detection membrane card slot a and is connected to the detection membrane card slot a. The controlled end of the lifting mechanism is connected to the output end of the controller.

3. The sampling device for the fluoride automatic analyzer according to claim 2, characterized in that: The lifting mechanism comprises a lead screw (54) rotatably arranged on the bottom wall of the box body (1), a nut (55) arranged in the box body (1) and matched with the lead screw (54), and a driving motor (56) connected to one end of the lead screw (54) extending out of the box body (1), and a controlled end of the driving motor (56) is connected to an output end of a controller; a first transverse plate (531) is fixedly arranged at the bottom end of the side wall of the steering air duct (53), the nut (55) is fixedly connected to a nut connecting plate (511), a guide roller (57) which is movably passed through the nut connecting plate (511) and the first transverse plate (531) in sequence is detachably arranged at the bottom end of the inner wall of the box body (1), and a first spring (58) which is sleeved on the outside of the guide roller (57) is fixedly arranged between the top end of the nut connecting plate (511) and the bottom end of the first transverse plate (531).

4. The sampling device for the fluoride automatic analyzer according to claim 2, characterized in that: A plurality of second guide rollers (59) that are movable through the movable clamping plate (4) are fixedly arranged at the top end of the sealing top plate (9), and a second spring (510) that is sleeved on the outside of the second guide rollers (59) is connected between the sealing top plate (9) and the movable clamping plate (4).

5. The sampling device for the fluoride automatic analyzer according to claim 2, characterized in that: A plurality of vertically arranged movable guide rails (52) are detachably connected in the box body (1), and the sealing top plate (9) passes through the movable guide rails (52) and can slide up and down along the movable guide rails (52).

6. The sampling device for the fluoride automatic analyzer according to claim 2, characterized in that: The sampling suction mechanism (6) comprises a spring air duct (61) connected to the steering air duct (53), an exhaust pipe (62) connected to the spring air duct (61), and a sampling pump connected to the exhaust pipe (62), wherein the controlled end of the sampling pump is connected to the output end of the controller.

7. The sampling device for the fluoride automatic analyzer according to claim 6, characterized in that: A flow meter (7) for counting the gas collection flow rate is provided on the side of the exhaust duct (62), and the output end of the flow meter (7) is connected to the input end of the controller.

8. The sampling device for the fluoride automatic analyzer according to claim 2, characterized in that: A limiter (8) for limiting the moving position of the sealing top plate (9) is fixedly arranged on the inner side wall of the box body (1), and the output end of the limiter (8) is connected to the input end of the controller.

9. The sampling device for the fluoride automatic analyzer according to claim 1, characterized in that: The sampling structure (2) and the blank test structure (3) are respectively provided with filter membrane support structures therein.

10. The sampling device for the fluoride automatic measuring instrument according to claim 1, characterized in that: A plurality of protrusions (42) are fixedly provided at the top end of the movable clamping plate (4), and a plurality of grooves (11) respectively matched with the protrusions (42) are provided at the top end of the inner wall of the box body (1).

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