Membrane changing device applied to particulate matter sampler

Abstract

According to the technical scheme, the membrane replacing device is characterized by comprising a fixing plate, and stations which are evenly distributed around the vertical axis are arranged at the top of the fixing plate; the rotating disc is arranged in the fixing plate, the axis of the rotating disc is vertical, and the rotating disc rotates around the vertical axis of the rotating disc in the fixing plate; the filter membrane push rod is used for pushing the turntable to rotate to the filter membrane in the bearing hole at the second station and upwards enter the filter membrane bin above the second station; an air inlet seat; the lower sampling pipe can move up and down to push the filter membrane rotating into the bearing hole at the first station to be upward and clamp the filter membrane between the lower sampling pipe and the air inlet seat for sampling; and a power mechanism. Through the arrangement of the filter membrane push rod and the lower sampling pipe, the filter membrane which is switched among the three stations along with the turntable can realize automatic sampling and membrane replacement, the mechanical structure is simple, and the equipment cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of atmospheric particle sampling, and more specifically, to a membrane replacement device applied to a particle sampler. Background Art

[0002] Atmospheric particulate matter sampling is mostly carried out using a particulate matter sampler. Traditional particulate matter samplers mostly use single-membrane sampling. After each filter membrane sampling is completed, it is necessary to collect the sampled filter membranes and place new filter membranes to be sampled, which requires a lot of manpower.

[0003] Most existing automatic membrane-changing particulate samplers use a robotic arm to clamp the filter membrane from the sampling station to the sampling station, and then clamp it from the sampling station to the storage position after sampling. It requires multiple sensors and has a complex mechanical structure, resulting in high equipment costs. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a membrane changing device for a particulate matter sampler, which, through the arrangement of a filter membrane push rod and a lower sampling tube, enables automatic sampling and membrane changing as the turntable switches between three stations, and has a simple mechanical structure, greatly reducing the equipment cost.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a membrane replacement device applied to a particle sampler, comprising a fixed plate, the top of which is provided with workstations evenly arranged around a vertical axis, namely a first workstation, a second workstation and a third workstation, each of which is provided with a clearance hole;

[0006] A turntable, wherein the turntable is arranged in the fixed plate and has a vertical axis, the turntable rotates around its own vertical axis in the fixed plate, the three workstations are arranged around the axis of the turntable, the turntable is provided with three bearing holes vertically penetrating the turntable, and the filter membrane is accommodated in the bearing holes;

[0007] A filter membrane push rod, which is arranged below the fixed plate and below the second station, and is used to push the turntable to rotate until the filter membrane in the bearing hole at the second station moves upward into the filter membrane bin above the second station;

[0008] An air inlet seat, the air inlet seat being arranged above the first station;

[0009] A lower sampling tube, which is arranged below the fixed plate and can move up and down to push the filter membrane in the bearing hole rotated to the first station upward and clamp the filter membrane between the lower sampling tube and the air inlet seat for sampling;

[0010] and a power mechanism which is used to drive the turntable to rotate, and drive the filter membrane push rod and the lower sampling tube to move up and down.

[0011] The utility model is further configured as: the power mechanism includes a power shaft which is vertically arranged;

[0012] an output shaft which is fixedly connected to the bottom of the turntable and is coaxial with the turntable;

[0013] a grooved pulley which is fixedly connected to the output shaft, and three grooves are arranged outside the grooved pulley;

[0014] and a dial which is fixedly connected outside the power shaft, and a dial rod which can be inserted into the groove of the grooved pulley to drive the grooved pulley to rotate is arranged on the dial.

[0015] The utility model is further configured as: the top of the filter membrane push rod is fixedly connected with a push disk which is arranged in a funnel shape at the bottom of the turntable, and the push disk can push the turntable upward to rotate the filter membrane in the bearing hole at the second working position upward into the filter membrane bin above the second working position.

[0016] The utility model is further configured as: the top of the lower sampling tube is fixedly connected with a sampling disk which is arranged in a funnel shape at the bottom of the turntable, the sampling disk is communicated with the sampling tube, and the sampling disk can push the filter membrane in the bearing hole at the first working position upward and clamp the filter membrane between the lower sampling tube and the air inlet seat.

[0017] The utility model is further configured as: the power mechanism further includes a connecting rod which is connected with the filter membrane push rod and the lower sampling tube to drive the filter membrane push rod and the lower sampling tube to move up and down;

[0018] a cam which is arranged at the bottom of the connecting rod, and the connecting rod periodically drives the filter membrane push rod and the lower sampling tube to move up and down under the action of the cam. When the cam rotates one week, the small diameter of the cam contacts with the connecting rod for two-thirds of the time, and the large diameter of the cam contacts with the connecting rod for one-third of the time;

[0019] and a bevel gear. There are two bevel gears, and the two bevel gears are respectively connected to the cam and the power shaft and are meshed with each other.

[0020] The utility model is further configured as: it further includes a bottom plate which is arranged below the fixing plate, and two connecting rods which connect the bottom plate and the fixing plate together are arranged between the bottom plate and the fixing plate. The two connecting rods are respectively arranged at positions close to the filter membrane push rod and close to the lower sampling tube;

[0021] The connecting rod is hinged on the filter membrane push rod and the lower sampling tube. One end of the connecting rod is hinged on the connecting rod close to the lower sampling tube, and the other end can move up and down on the connecting rod close to the filter membrane push rod.

[0022] The present utility model is further configured as follows: The power mechanism further includes a motor, and the motor is fixedly connected to the bottom plate;

[0023] an output gear, and the output gear is fixedly connected to the output shaft of the motor;

[0024] and a reduction gear, and the reduction gear is fixedly connected to the power shaft and meshes with the output gear.

[0025] The present utility model is further configured as follows: A photoelectric sensor connected to the bottom of the fixed plate is arranged on one side of the power shaft, and the photoelectric sensor includes a light emitting end and a receiving end arranged in the vertical direction;

[0026] A light shielding sheet is fixedly connected to one side of the power shaft. When the lower sampling tube pushes the filter membrane upward and clamps the filter membrane between the air inlet seat and the lower sampling tube, the light shielding sheet rotates to the light emitting end and the receiving end of the photoelectric sensor.

[0027] In summary, the present utility model has the following beneficial effects compared with the prior art: Through the arrangement of the filter membrane push rod and the lower sampling tube, the filter membrane that rotates between the three workstations along with the turntable can realize automatic sampling and membrane replacement, and the mechanical structure is simple, greatly reducing the equipment cost. Description of the Drawings

[0028] Figure 1 is a schematic diagram of the overall structure of the embodiment;

[0029] Figure 2 is a schematic diagram showing the power mechanism of the embodiment;

[0030] Figure 3 is for Figure 2 a partially enlarged schematic diagram at part A;

[0031] Figure 4 is for Figure 2 a partially enlarged schematic diagram at part B;

[0032] Figure 5 is a sectional view of the overall structure of the embodiment.

[0033] In the figure: 1. Fixed plate; 11. First workstation; 111. Air inlet seat; 12. Second workstation; 13. Third workstation; 10. Relief hole; 2. Turntable; 21. Carrying hole; 3. Lower sampling tube; 31. Sampling disc; 4. Filter membrane push rod; 41. Pushing disc; 5. Power mechanism; 51. Power shaft; 511. Dial; 512. Dial rod; 52. Output shaft; 521. Grooved wheel; 53. Connecting rod; 54. Output gear; 55. Reduction gear; 56. Bevel gear; 57. Cam; 6. Bottom plate; 61. Connecting rod; 7. Connecting pipe; 8. Photoelectric sensor; 81. Light shielding sheet; 9. Spring. Detailed implementation mode

[0034] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings of the present utility model. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "upper", "lower", "left", "right", etc., are only references to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration rather than limitation of the present invention.

[0035] The present utility model will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0036] Embodiment: A membrane changing device applied to a particulate matter sampler, see attached Figure 1 - attached Figure 5 , including a fixing plate 1, a turntable 2, a filter membrane push rod 4, an air inlet seat 111, a lower sampling tube 3 and a power mechanism 5. The top of the fixing plate 1 is provided with work positions arranged uniformly around the vertical axis, namely a first work position 11, a second work position 12 and a third work position 13. A relief hole 10 is provided at each work position; the turntable 2 is arranged inside the fixing plate 1 and the axis is vertical. The turntable 2 rotates around its own vertical axis inside the fixing plate 1. The three work positions are arranged around the axis of the turntable 2. Three vertically penetrating load holes 21 are provided on the turntable 2, and the filter membrane is accommodated in the load holes 21; the filter membrane push rod 4 is arranged below the fixing plate 1 and is located below the second work position 12. The filter membrane push rod 4 is used to push the turntable 2 to rotate so that the filter membrane in the load hole 21 at the second work position 12 moves upward into the filter membrane bin above the second work position 12; the air inlet seat 111 is arranged above the first work position 11; the lower sampling tube 3 is arranged below the fixing plate 1 and can move up and down to push the filter membrane in the load hole 21 rotated to the first work position 11 upward and clamp the filter membrane between the lower sampling tube 3 and the air inlet seat 111 for sampling; the power mechanism 5 is used to drive the rotation of the turntable 2, the up and down movement of the filter membrane push rod 4 and the lower sampling tube 3.

[0037] The filter membrane is placed in the bearing hole 21 of the turntable 2 at the third station 13. Under the rotation of the turntable 2, the filter membrane passes through the first station 11 and the second station 12 in sequence. When at the first station 11, the filter membrane is clamped between the lower sampling tube 3 and the air inlet seat 111 under the action of the lower sampling tube 3, and the sampling of the filter membrane is achieved by the flow of breath between the air inlet seat 111 and the lower sampling tube 3. After sampling, the sampled filter membrane enters the second station 12 under the action of the turntable 2. At the second station 12, the filter membrane is moved upward into the filter membrane bin by the action of the filter membrane push rod 4. The filter membrane bin is configured as a filter membrane bin with a one-way valve. The filter membrane can only enter the filter membrane bin upward and cannot leave the filter membrane bin downward, thereby realizing the collection of the sampled filter membrane. Afterwards, the vacant bearing hole 21 is rotated to the third station 13 again to place a new filter membrane to be sampled.

[0038] Specifically, the power mechanism 5 includes a power shaft 51, an output shaft 52, a groove wheel 521 and a dial 511. The power shaft 51 is vertically arranged; the output shaft 52 is fixedly connected to the bottom of the turntable 2 and is coaxial with the turntable 2; the groove wheel 521 is fixedly connected to the output shaft 52, and three grooves are arranged outside the groove wheel 521; the dial 511 is fixedly connected to the outside of the power shaft 51, and a lever 512 is arranged on the dial 511 that can be inserted into the groove of the groove wheel 521 to drive the groove wheel 521 to rotate. Through the arrangement of the groove wheel 521 and the lever 512, when the power shaft 51 rotates, each rotation will cause the output shaft 52 to rotate by one third of a circle through the lever 512, that is, the bearing hole 21 on the turntable 2 is driven to rotate from one station to the next station.

[0039] Specifically, the top of the filter membrane push rod 4 is fixedly connected to a funnel-shaped push plate 41 located at the bottom of the turntable 2, and the push plate 41 can push the turntable 2 upward to rotate until the filter membrane in the bearing hole 21 at the second station 12 enters the filter membrane bin above the second station 12.

[0040] Specifically, the top of the lower sampling tube 3 is fixedly connected to a sampling disk 31 in a funnel shape located at the bottom of the turntable 2. The sampling disk 31 is connected to the sampling tube. The sampling disk 31 can push the filter membrane in the bearing hole 21 rotated to the first station 11 upward and clamp the filter membrane between the lower sampling tube 3 and the air inlet seat 111.

[0041] Specifically, the power mechanism 5 further includes a connecting rod 53, a cam 57, and a bevel gear 56. The connecting rod 53 is connected to the filter membrane push rod 4 and the lower sampling tube 3 to drive the filter membrane push rod 4 and the lower sampling tube 3 to move up and down. The cam 57 is disposed at the bottom of the connecting rod 53. Under the action of the cam 57, the connecting rod 53 periodically drives the filter membrane push rod 4 and the lower sampling tube 3 to move up and down. When the cam 57 rotates one week, the small diameter of the cam 57 contacts the connecting rod 53 for two-thirds of the time, and the large diameter of the cam 57 contacts the connecting rod 53 for one-third of the time. Two bevel gears 56 are provided. The two bevel gears 56 are respectively connected to the cam 57 and the power shaft 51 and the two bevel gears 56 mesh with each other.

[0042] Through the arrangement of the cam 57 and the connecting rod 53, the rotation of the cam 57 can periodically push the filter membrane push rod 4 and the lower sampling tube 3 to move upward.

[0043] Specifically, this embodiment further includes a bottom plate 6. The bottom plate 6 is disposed below the fixing plate 1. Two connecting rods 61 for connecting the bottom plate 6 and the fixing plate 1 are provided between the bottom plate 6 and the fixing plate 1. The two connecting rods 61 are respectively disposed at positions close to the filter membrane push rod 4 and close to the lower sampling tube 3. The connecting rod 53 is hinged to the filter membrane push rod 4 and the lower sampling tube 3. One end of the connecting rod 53 is hinged to the connecting rod 61 close to the lower sampling tube 3, and the other end can move up and down on the connecting rod 61 close to the filter membrane push rod 4.

[0044] A connecting tube 7 is sleeved outside both the filter membrane push rod 4 and the lower sampling tube 3. The connecting rod 53 is hinged to the filter membrane push rod 4 and the lower sampling tube 3 by hinging with the connecting tube 7. Springs 9 are sleeved outside both the filter membrane push rod 4 and the lower sampling tube 3. Two ends of the springs 9 respectively abut against the connecting tube 7 and the fixing plate 1 to push the filter membrane push rod 4 and the lower sampling tube 3 to move downward after the filter membrane push rod 4 and the lower sampling tube 3 move upward.

[0045] Specifically, the power mechanism 5 further includes a motor, an output gear 54, and a reduction gear 55. The motor is fixedly connected to the bottom plate 6. The output gear 54 is fixedly connected to the output shaft 52 of the motor. The reduction gear 55 is fixedly connected to the power shaft 51 and meshes with the output gear 54.

[0046] A photoelectric sensor 8 connected to the bottom of the fixing plate 1 is disposed on one side of the power shaft 51. The photoelectric sensor 8 includes a light emitting end and a receiving end arranged in the vertical direction. A light shielding sheet 81 is fixedly connected to one side of the power shaft 51. When the lower sampling tube 3 pushes the filter membrane upward and clamps the filter membrane between the air inlet seat 111 and the lower sampling tube 3, the light shielding sheet 81 rotates to the light emitting end and the receiving end of the photoelectric sensor 8.

[0047] When the device is in use, in the first stage, at the first station 11, there is a sampled filter membrane, the bearing hole 21 at the second station 12 is empty, and a new filter membrane to be sampled is placed at the third station 13. At this time, the lever 512 is about to rotate into the groove of the sprocket 521; in the second stage, the lever 512 rotates into the groove of the sprocket 521, and the power shaft 51 rotates one-third of a turn, which also drives the output shaft 52 to rotate one-third of a turn. Under the action of the turntable 2, the sampled filter membrane enters the second station 12, the new filter membrane to be sampled enters the first station 11, the sampled filter membrane enters the second station 12, and the controlled bearing hole 21 enters the third station 13. In the second stage, the cam 57 is always in contact with the connecting rod 53 at the small diameter, and the connecting rod 53 remains unchanged; then it enters the third stage. In the third stage, the power shaft 51 continues to rotate two-thirds of a turn. During these two-thirds of a turn, since the lever 512 disengages from the groove of the sprocket 521, the output shaft 52 stops rotating, while the cam 57 gradually changes from the small diameter to the large diameter and contacts the connecting rod 53 and then changes back to the small diameter and contacts the connecting rod 53 during these two-thirds of a turn. During this process, the connecting rod 53 moves upward under the action of the cam 57, thereby driving the filter membrane push rod 4 and the lower sampling tube 3 to move upward; when the longest diameter of the cam 57 contacts the bottom of the connecting rod 53, the filter membrane push rod 4 pushes the sampled filter membrane at the second station 12 into the filter membrane bin for storage, and the lower sampling tube 3 presses the filter membrane to be sampled at the first station 11 against the bottom of the air inlet seat 111. At this time, the light shielding piece 81 rotates between the light emitting end and the receiving end of the photoelectric sensor 8, and the receiving end does not receive the light signal. At this time, the sampler is controlled to start working, and the gas in the air inlet seat 111 passes through the filter membrane to be sampled and enters the lower sampling tube 3 to realize the sampling of the filter membrane to be sampled. Then the cam 57 continues to rotate, and the connecting rod 53 descends to the initial height under the action of the spring 9. At this time, there is a sampled filter membrane at the first station 11, the bearing hole 21 at the second station 12 is empty, and a new filter membrane to be sampled is placed at the third station 13. Then the above process is repeated to realize cyclic sampling.

[0048] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A membrane replacement device for a particle sampler, characterized in that: It comprises a fixed plate (1), the top of which is provided with workstations evenly arranged around a vertical axis, namely a first workstation (11), a second workstation (12) and a third workstation (13), each of which is provided with a clearance hole (10); A turntable (2), wherein the turntable (2) is arranged in the fixed plate (1) and has a vertical axis. The turntable (2) rotates around its own vertical axis in the fixed plate (1). The three workstations are arranged around the axis of the turntable (2). The turntable (2) is provided with three bearing holes (21) vertically penetrating the turntable (2), and the filter membrane is accommodated in the bearing holes (21); A filter membrane push rod (4), the filter membrane push rod (4) being arranged below the fixed plate (1) and below the second station (12), the filter membrane push rod (4) being used to push the rotating disk (2) to rotate until the filter membrane in the bearing hole (21) at the second station (12) moves upward into the filter membrane bin above the second station (12); An air inlet seat (111), wherein the air inlet seat (111) is arranged above the first workstation (11); A lower sampling tube (3), the lower sampling tube (3) being arranged below the fixed plate (1) and being capable of moving up and down to push the filter membrane in the bearing hole (21) rotated to the first station (11) upwards and clamp the filter membrane between the lower sampling tube (3) and the air inlet seat (111) for sampling; And a power mechanism (5), wherein the power mechanism (5) is used to drive the turntable (2) to rotate, and the filter membrane push rod (4) and the lower sampling tube (3) to move up and down.

2. The membrane replacement device for a particle sampler according to claim 1, characterized in that: The power mechanism (5) comprises a power shaft (51), and the power shaft (51) is arranged vertically; An output shaft (52), the output shaft (52) being fixedly connected to the bottom of the rotating disk (2) and being coaxial with the rotating disk (2); A sheave (521), wherein the sheave (521) is fixedly connected to the output shaft (52), and three grooves are arranged outside the sheave (521); and a dial (511), wherein the dial (511) is fixedly connected to the outside of the power shaft (51), and the dial (511) is provided with a lever (512) capable of being inserted into the groove of the groove wheel (521) to drive the groove wheel (521) to rotate.

3. The membrane replacement device for a particle sampler according to claim 2, characterized in that: The top of the filter membrane push rod (4) is fixedly connected to a push disk (41) arranged in a funnel shape at the bottom of the turntable (2), and the push disk (41) can push the turntable (2) upward to rotate until the filter membrane in the bearing hole (21) at the second station (12) enters upward into the filter membrane bin above the second station (12).

4. The membrane replacement device for a particle sampler according to claim 3, characterized in that: The top of the lower sampling tube (3) is fixedly connected to a sampling disk (31) arranged in a funnel shape and located at the bottom of the turntable (2); the sampling disk (31) is connected to the sampling tube; the sampling disk (31) can push the filter membrane in the bearing hole (21) rotated to the first station (11) upward and clamp the filter membrane between the lower sampling tube (3) and the air inlet seat (111).

5. The membrane replacement device for a particle sampler according to claim 4, characterized in that: The power mechanism (5) further comprises a connecting rod (53), wherein the connecting rod (53) is connected to the filter membrane push rod (4) and the lower sampling tube (3) to push the filter membrane push rod (4) and the lower sampling tube (3) to move up and down; A cam (57), wherein the cam (57) is arranged at the bottom of the connecting rod (53). Under the action of the cam (57), the connecting rod (53) periodically drives the filter membrane push rod (4) and the lower sampling tube (3) to move up and down. When the cam (57) rotates one circle, the small diameter of the cam (57) contacts the connecting rod (53) for two-thirds of the time, and the large diameter of the cam (57) contacts the connecting rod (53) for one-third of the time. and a bevel gear (56), wherein two bevel gears (56) are provided, the two bevel gears (56) are respectively connected to the cam (57) and the power shaft (51), and the two bevel gears (56) are meshed with each other.

6. The membrane replacement device for a particle sampler according to claim 5, characterized in that: It also includes a bottom plate (6), the bottom plate (6) being arranged below the fixed plate (1), and two connecting rods (61) connecting the bottom plate (6) and the fixed plate (1) are arranged between the bottom plate (6) and the fixed plate (1), and the two connecting rods (61) are arranged at positions close to the filter membrane push rod (4) and close to the lower sampling tube (3), respectively; The connecting rod (53) is connected to the filter membrane push rod (4) and the lower sampling tube (3), one end of the connecting rod (53) is hinged to a connecting rod (61) close to the lower sampling tube (3), and the other end can move up and down on the connecting rod (61) close to the filter membrane push rod (4).

7. The membrane replacement device for a particle sampler according to claim 6, characterized in that: The power mechanism (5) further comprises a motor, and the motor is fixedly connected to the base plate (6); An output gear (54), wherein the output gear (54) is fixedly connected to an output shaft (52) of the motor; and a reduction gear (55), wherein the reduction gear (55) is fixedly connected to the power shaft (51) and meshes with the output gear (54).

8. The membrane replacement device for a particle sampler according to claim 7, characterized in that: A photoelectric sensor (8) connected to the bottom of the fixing plate (1) is provided on one side of the power shaft (51), and the photoelectric sensor (8) comprises a light emitting end and a receiving end arranged in a vertical direction; A light shielding sheet (81) is fixedly connected to one side of the power shaft (51), and when the lower sampling tube (3) pushes the filter membrane upward and clamps the filter membrane between the air inlet seat (111) and the lower sampling tube (3), the light shielding sheet (81) rotates to the light-emitting end and the receiving end of the photoelectric sensor (8).

Images