Gaseous pollutant automatic sample injection device
Technical Field
The invention belongs to the field of air purification, and particularly relates to an automatic sample injection device for gaseous pollutants.
Background
In the air purifier standard GB/T18801-2015, the performance test of the air purifier such as formaldehyde is stipulated that a certain concentration of formaldehyde needs to be added into a test bin for testing the performance of the air purifier in purifying formaldehyde, however, in actual operation, liquid sampling is needed for formaldehyde, then evaporation is needed for formaldehyde liquid, and formaldehyde gas is controlled to enter the test bin. The existing test mechanism generally adopts a microinjector to inject formaldehyde into a heating block in a test bin through a pipeline for volatilization, the formaldehyde content in the test bin is very likely to be difficult to control due to the mode, the error is large, the standard requirement is sometimes exceeded, an exhaust system of the test bin is required to be opened, part of gas is discharged, the formaldehyde concentration regulated by the standard can be reached, the whole operation is time-consuming and laborious, and certain potential safety hazards exist in manual injection.
In the prior art, a plurality of automatic sample injectors for gas chromatography are provided, peristaltic pumps are adopted to sample through a pipeline and a needle, the structure is suitable for the situation that the sample injection amount is large, and the initial amount of the peristaltic pumps and the residual liquid in the pipeline have large influence on accuracy and are difficult to control. The error brought by the sample injection system can be controlled by adopting a special micro-injector. The Chinese patent publication No. CN108051256A discloses an automatic sampling device integrating sampling and evaporation and a control method thereof, which controls the up-and-down and left-and-right movement of a microinjector and controls the sucking and injecting actions of the microinjector to realize automatic control through the coordination of an X-axis movement assembly, a Z1-axis movement assembly and a Z2-axis movement assembly, however, the device has the following defects: 1) The whole automatic sample injection device has larger volume by adopting structures such as a screw rod sliding table and the like; 2) The needle of the microinjector is easy to bend and needs to be replaced frequently; 3) The formaldehyde gas is pumped into the test bin by the air pump, so that the test environment noise is increased; 4) The sample injection structure is formed to move transversely, the transverse moving distance of the sample injection structure is large, and the error of the moving precision is increased; 5) The moving component bracket is heavy, and the screw thread is stressed and deformed for a long time when the moving component bracket is stopped at the reset position for a long time, so that the initial position and the moving state of the device are changed, the change is irreversible, and the screw needs to be replaced periodically; 6) The placing cavity of the microinjector is loose, the microinjector can swing in a small amplitude in the working process, and the needle is easy to bend.
Disclosure of Invention
The application aims to solve the problems in the prior art, and provides the automatic gaseous pollutant sampling device which has the advantages of exquisite structural design, small volume, low noise, reasonable weight control of a movable assembly and difficult bending of a needle head of a microinjector, and can be placed in a test bin. The method is realized by the following technical scheme:
The automatic sample injection device for gaseous pollutants comprises an injector, a base shell, a bottom plate bracket, a plurality of sample bottles and evaporators, a PCB assembly, a power jack, a first stepping motor, a through hole structure, a rotary shaft fixing plate, a main body bracket, a rotary shaft fixing plate and a main body bracket, wherein the plurality of sample bottles and the evaporators are fixedly arranged on the bottom plate bracket in a matched mode with the base shell, the power jack is further arranged on the side face of the base shell, the first stepping motor is fixedly arranged in the base shell and is connected with the rotary shaft fixing plate through the rotary shaft through the through hole structure of the base shell, the rotary shaft fixing plate is driven to rotate along the axis of the rotary shaft by the first stepping motor, the rotary shaft fixing plate extends to deviate from the axis of the rotary shaft, the main body bracket is arranged on the rotary shaft fixing plate and is arranged on the edge of the rotary shaft fixing plate,
The main body support is provided with a second stepping motor, and the PCB assembly is powered by a power jack and is electrically connected with the first stepping motor, the second stepping motor and the third stepping motor; the second stepping motor is fixedly arranged at the lower part of the main body bracket and is connected with a first fixed pulley fixedly arranged on the main body bracket through a first synchronous belt, a first sliding block is arranged on the first synchronous belt and is fixedly connected with the first bracket, the first sliding block and the first bracket are driven to move through the first synchronous belt,
The main body support is provided with a first fixing rod, the first fixing rod is provided with a sliding sleeve, and the first support is connected with the first fixing rod through the sliding sleeve and moves along the first fixing rod;
The third stepping motor is fixedly connected with the first bracket and moves along with the first bracket, and is connected with the second fixed pulley through a second synchronous belt, and the second fixed pulley is fixed on the first bracket; the second synchronous belt is provided with a second sliding block which is fixedly connected with the injection adjusting block and drives the second sliding block and the injection adjusting block to move through the second synchronous belt,
The first bracket is provided with a second fixed rod, the injection adjusting block moves along the structure of the second fixed rod, a third fixed rod is sleeved in the second fixed rod, the third fixed rod is elastically connected with the second fixed rod, the second fixed rod is connected with the pinhole protecting block to control the pinhole protecting block to move up and down along the third fixed rod,
The injector comprises a needle cylinder, a push rod and a needle head;
The injection adjusting block is in a groove shape and comprises a bolt and a press button, the push rod is pressed and fixed through the movement of the press button on the bolt, and the push rod is driven to move in the needle cylinder through the injection adjusting block;
An injection bracket is also fixed on the first bracket and is used for fixedly placing a needle cylinder and is matched with an injection adjusting block to realize the injection process of the injector;
The needle hole protection block is L-shaped, an injection copper column is arranged at the bottom, a needle hole for a needle to pass through is formed in the middle of the injection copper column, the needle hole is matched with the needle position, and the needle is prevented from bending due to the deviation of the needle position when the needle is pricked into a rubber plug of a sample bottle or the like.
Preferably, the injection bracket is also provided with a baffle plate for blocking the needle cylinder and fixing the needle cylinder in the injection bracket, and the baffle plate is hinged with the injection bracket and can control the taking and placing of the needle cylinder through rotation.
Further, the baffle is Z-shaped, one end is provided with a handle, and the other end is of a limit structure and is used for limiting the rotation position of the baffle.
Further, the injection support is provided with a first groove, and the first groove is used for limiting the moving position of the limiting structure.
Preferably, the injection bracket is provided with a second groove, and the second groove is convenient for taking and placing the needle cylinder.
Preferably, the first support is further provided with a first limiting block and a second limiting block, one side of the main body support is of a flanging structure, and the first limiting block and the second limiting block are matched with the flanging structure on the main body support to prevent the first support from rotating along the axis of the first fixing rod.
Preferably, the sliding sleeve is further provided with a damping piece, the damping piece is in elastic contact with the first support, the damping piece moves along with the sliding sleeve, and the damping piece is used for enhancing damping of the first support moving along the first fixing rod and preventing motion precision errors caused by gravity and other acting forces.
Further, the damping fin is of a fork-shaped structure, friction force between the damping fin and the first support is reduced, damping of movement of the first support is controlled not to be too large, load of the second stepping motor is reduced, and service life is prolonged.
Preferably, the third stepper motor is further provided with a supporting pulley, the first bracket is provided with an elastic sheet matched with the supporting pulley, the elastic sheet can provide supporting force for the supporting pulley, and the precision changes of the starting position and the like of the stepper motor caused by gravity are prevented, so that the service life is prolonged.
Preferably, the winding displacement storage barrel is arranged on the outer side of the rotating shaft and used for storing the winding displacement, and the winding displacement is driven to rotate around the rotating shaft when the rotating shaft rotates, so that the winding displacement storage barrel is attractive and convenient.
Preferably, the base shell is also provided with an outer cover for protecting the whole device.
Preferably, the PCB assembly may be divided into a first PCB and a second PCB, the first PCB being fixed on the bottom plate bracket, the second PCB being fixed on the main body bracket; the first PCB board, the second PCB board are connected with the power supply jack respectively and supply power, first step motor operation is controlled to first PCB board, second step motor and third step motor operation are controlled to the second PCB board.
The sample bottles in the above scheme can be a plurality of different samples, cleaning bottles, waste liquid bottles and the like, and are selected according to the needs.
When the device is operated, the main body support is controlled by the first stepping motor to move to the corresponding positions of the sample bottles, the cleaning bottles, the waste liquid bottles and the evaporator; the first bracket is controlled by the second stepping motor to realize the up-and-down movement of the injector, such as inserting a needle into a sample bottle; the push rod is controlled by the third stepping motor to realize automatic liquid suction and injection processes of the injector.
Compared with the prior art, the application has the beneficial effects that:
The main body support is driven to rotate by the first stepping motor instead of horizontally moving, so that the displacement of the first stepping motor can be reduced, the size of the device is greatly reduced, the time is saved, and the error risk caused by the possible defect of displacement precision is reduced. The second stepping motor, the third stepping motor, the first bracket and other structures are exquisite in design, compact and reasonable in structure, and the running purpose of the whole device can be perfectly achieved. When placing in the test storehouse, whole device structure air permeability is good, and the evaporimeter can be direct with solution evaporation, diffuses to in the test storehouse, need not to install the air pump, reduces device noise, and reduces control complexity.
Drawings
FIG. 1 is a schematic perspective view of an automatic sample injection device for gaseous pollutants according to an embodiment;
FIG. 2 is a schematic diagram of the structure of the automatic gaseous pollutant sampling device with the outer cover removed according to the embodiment;
FIG. 3 is a schematic diagram of an embodiment of an automatic sample injection device for gaseous pollutants, showing the internal structure of a base housing;
FIG. 4 is a front view of the view of FIG. 2;
FIG. 5 is a front view of the view of FIG. 2 with the first bracket broken away;
FIG. 6 is a perspective view of a related structure of a main body support of the automatic sample injection device for gaseous pollutants according to the embodiment;
FIG. 7 is a schematic side view of a related structure of a main body support of the automatic sample injection device for gaseous pollutants according to the embodiment;
FIG. 8 is another perspective view of a related structure of a main body support of the automatic sample injection device for gaseous pollutants according to the embodiment;
FIG. 9 is a schematic diagram of a related structure of a second fixing rod and a third fixing rod of the automatic sample injection device for gaseous pollutants according to the embodiment;
Fig. 10 is a schematic diagram of a pinhole protection block of the automatic gaseous pollutant sampling device according to the embodiment.
In the drawings, reference numerals are: the device comprises a base shell, a base support, a 102 housing, 103 power supply jacks, 201 sample bottles, 202 evaporators, 301 first PCB boards, 302 second PCB boards, 401 first stepping motors, 402 rotating shafts, 403 rotating shaft fixing plates, 404 winding displacement storage barrels, 501 second stepping motors, 502 first fixed pulleys, 503 first synchronous belts, 504 first sliding blocks, 601 third stepping motors, 602 second fixed pulleys, 603 second synchronous belts, 604 second sliding blocks, 605 supporting pulleys, 7 main body supports, 701 first fixing rods, 702 sliding sleeves, 703 damping sheets, 704 folding structures, 705 elastic sheets, 8 first supports, 801 first limiting blocks, 802 second limiting blocks, 803 second fixing rods, 804 third fixing rods, 901 injection supports, 9011 baffle plates, 9012 second grooves, 902 injection adjusting blocks, 9021 bolts, 9022 push buttons, 903 protecting blocks, 904 injection copper columns, 1001 needle cylinders, 1002 push rods and 1003.
Detailed Description
The technical solution of the present application is further described below with reference to the specific embodiments, and it should be noted that the specific technical solution of the embodiment of the present application is not a limitation of the claims of the present application, and the words of up, down, front, back, etc. in the present application are all azimuth words, and are not limiting on structural positions, and those skilled in the art can adjust positions according to actual practice.
Examples
The automatic sample injection device for gaseous pollutants as shown in fig. 1-10, which comprises an injector, a base housing 1 and a bottom plate bracket 101, wherein the bottom plate bracket 101 is matched with the base housing 1 to fixedly provide a plurality of sample bottles 201 and evaporators 202, a PCB assembly is fixed on the bottom plate bracket 101, a power jack 103 is further arranged on the side surface of the base housing 1, a first stepping motor 401 is fixed in the base housing 1, a through hole structure is arranged on the base housing 1, the first stepping motor 401 is connected with a rotating shaft fixing plate 403 through a rotating shaft 402 through the through hole structure of the base housing 1, the first stepping motor 401 drives the rotating shaft 402 fixing plate to rotate along the axis of the rotating shaft 402, the rotating shaft fixing plate 403 extends to deviate from the axis of the rotating shaft 402, a main body bracket 7 is arranged on the rotating shaft fixing plate 403, the main body bracket 7 is arranged at the edge of the rotating shaft fixing plate 403,
The main body bracket 7 is provided with a second stepping motor 501, and the PCB assembly is powered by the power jack 103 and is electrically connected with the first stepping motor 401, the second stepping motor 501 and the third stepping motor 601; the second stepping motor 501 is fixedly arranged at the lower part of the main body bracket 7, the second stepping motor 501 is connected with a first fixed pulley 502 fixedly arranged on the main body bracket 7 through a first synchronous belt 503, a first sliding block 504 is arranged on the first synchronous belt 503, the first sliding block 504 is fixedly connected with the first bracket 8, the first sliding block 504 and the first bracket 8 are driven to move through the first synchronous belt 503,
The main body bracket 7 is provided with a first fixing rod 701, the first fixing rod 701 is provided with a sliding sleeve 702, and the first bracket 8 is connected with the first fixing rod 701 through the sliding sleeve 702 and moves along the first fixing rod 701;
The third stepping motor 601 is fixedly connected with the first bracket 8 and moves along with the first bracket 8, the third stepping motor 601 is connected with the second fixed pulley 602 through the second synchronous belt 603, and the second fixed pulley 602 is fixed on the first bracket 8; a second slider 604 is arranged on the second synchronous belt 603, the second slider 604 is fixedly connected with the injection adjusting block, the second slider 604 and the injection adjusting block are driven to move by the second synchronous belt 603,
The first bracket 8 is provided with a second fixing rod 803, the injection adjusting block moves along the second fixing rod 803, a third fixing rod 804 is sleeved in the second fixing rod 803, the third fixing rod 804 is respectively connected with the second fixing rod 803 and the pinhole protecting block 903 through springs (not shown in the figure) so as to control the pinhole protecting block 903 to move up and down along the third fixing rod 804 through spring expansion and contraction,
The syringe includes a barrel 1001, a pushrod 1002, and a needle 1003;
The injection adjusting block 902 is in a groove shape and comprises a bolt 9021 and a press button 9022, the push rod 1002 is pressed and fixed by the movement of the press button 9022 on the bolt 9021, and the push rod 1002 is driven to move in the syringe 1001 by the injection adjusting block 902;
An injection bracket 901 is also fixed on the first bracket 8, the injection bracket 901 is used for fixedly placing a syringe 1001 and is matched with an injection adjusting block 902 to realize the injection process of the injector;
The pinhole protection block 903 is L-shaped, the bottom is provided with an injection copper column 904, a pinhole for a needle 1003 to pass through is arranged in the middle of the injection copper column 904, and the pinhole is matched with the needle 1003 in position, so that the needle 1003 is prevented from bending due to the position deviation of the needle 1003 when the needle 1003 is pricked into a rubber plug of the sample bottle 201 and the like.
The injection bracket 901 is further provided with a baffle 9011 for blocking the syringe 1001 and fixing the baffle 9011 in the injection bracket 901, and the baffle 9011 is hinged with the injection bracket 901, so that the syringe 1001 can be controlled to be taken and put by rotation.
Further, the baffle 9011 is in a zigzag shape, one end of the baffle 9011 is provided with a handle, and the other end of the baffle 9011 is in a limiting structure for limiting the rotation position of the baffle 9011.
Further, the injection bracket 901 is provided with a first groove, and the first groove is used for limiting the moving position of the limiting structure.
Wherein, the injection bracket 901 is provided with a second groove 9012, and the second groove 9012 is convenient for taking and placing the syringe 1001.
The first bracket 8 is further provided with a first limiting block 801 and a second limiting block 802, one side of the main body bracket 7 is provided with a flanging structure 704, and the first limiting block 801 and the second limiting block 802 are matched with the flanging structure 704 on the main body bracket 7 to prevent the first bracket 8 from rotating along the axis of the first fixing rod 701.
The sliding sleeve 702 is further provided with a damping piece 703, the damping piece 703 is in elastic contact with the first support 8, the damping piece 703 moves along with the sliding sleeve 702, and the damping piece 703 is used for enhancing damping of the first support 8 moving along the first fixing rod 701 and preventing motion precision errors caused by gravity and other acting forces.
Further, the damping fin 703 has a fork-shaped structure, so that friction between the damping fin 703 and the first bracket 8 is reduced, the damping of the movement of the first bracket 8 is controlled not to be too large, the load of the second stepping motor 501 is reduced, and the service life is prolonged.
The third stepper motor 601 is further provided with a supporting pulley 605, the first bracket 8 is provided with a spring piece 705 matched with the supporting pulley 605, the spring piece 705 can provide supporting force for the supporting pulley 605, and precision changes such as the initial position of the stepper motor caused by gravity are prevented, so that the service life is prolonged.
The wire arranging storage barrel 404 is arranged on the outer side of the rotating shaft 402 and is used for storing wires, so that the wires are driven to rotate around the rotating shaft 402 when the rotating shaft 402 rotates, and the wire arranging storage barrel is attractive and convenient.
Wherein, the base shell 101 is also provided with a housing 102 for protecting the whole device.
The PCB assembly can be divided into a first PCB 301 and a second PCB 302, wherein the first PCB 301 is fixed on the bottom plate bracket 101, and the second PCB 302 is fixed on the main body bracket 7; the first PCB 301 and the second PCB 302 are respectively connected with the power jack 103 for supplying power, the first PCB 301 controls the first stepping motor 401 to operate, and the second PCB 302 controls the second stepping motor 501 and the third stepping motor 601 to operate.
The sample bottles 201 in the above scheme can be a plurality of different samples, washing bottles, waste liquid bottles and the like, and are selected according to the needs.
When in operation, the main body bracket 7 is controlled by the first stepping motor 401 to move to the corresponding positions of the sample bottles 201, the cleaning bottles, the waste liquid bottles and the evaporator 202; the first bracket 8 is controlled by the second stepping motor 501 to realize the up-and-down movement of the injector, such as inserting a needle into the sample bottle 201; the automatic aspiration and injection process of the syringe is accomplished by controlling the push rod 1002 through the third stepper motor 601.
It should be noted that, in the specific embodiments described in the present specification, shapes of parts, names and the like may be different, and the above description in the present specification is merely illustrative of the structures of the present application. Equivalent or simple changes of the structure, characteristics and principle according to the technical conception of the present application are included in the protection scope of the present application. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the application as defined in the accompanying claims.