An automatic quantitative dispensing device and method for chemical experiment samples

Abstract

The present invention discloses an automatic quantitative dispensing device and method for chemical experiment samples. The device has a dynamic quantitative bin with variable volume, which can quantitatively dispense chemical experiment samples according to the required mass. The dynamic quantitative bin adjusts the volume inside the bin by stretching a stretchable film. Since the film is an integral part and there is no spliced part, this method can effectively avoid chemical experiment samples getting stuck in the gaps compared with the existing method of adjusting the relative positions of two parts to adjust the volume. The structural environment of the sample conveying mechanism is simple and there is no filter screen, which can avoid the dispensing error caused by chemical experiment samples getting stuck in the gaps or adhering to the filter screen. Further, by improving the structure of the sample conveying bin and combining various means such as the vibration of a vibrator, the negative pressure adsorption of the sample conveying bin, and the blowing of an air pipe, the smooth conveyance of chemical experiment samples can be effectively ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical laboratory equipment, and particularly relates to an automatic quantitative dispensing device and method for chemical experiment samples. Background Art

[0002] In the process of chemical experiment sample analysis, it is necessary to divide the sample into multiple portions as required and put them into centrifuge tubes. The existing chemical experiment powder dispensing methods usually use manual methods of using a quantitative spoon or an electronic scale to weigh the required weight of the sample, and then manually put the sample into the centrifuge tube. This method is time-consuming and laborious and cannot meet the requirements of laboratory automation. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic quantitative dispensing device for chemical experiment samples and a method for quantitatively dispensing chemical experiment samples using the above device, which can automatically quantitatively dispense chemical experiment samples.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention discloses an automatic quantitative dispensing device for chemical experiment samples, including a sample feeding mechanism, a sample quantitative mechanism, a sample conveying mechanism, and a sample holding mechanism;

[0006] The sample quantitative mechanism includes a first turntable, a telescopic film, a support plate, and a support plate driving component. The first turntable is provided with a plurality of openings along the circumferential direction of its edge. The support plate is located below the openings. The support plate driving component drives the support plate to move up and down. The telescopic film connects the support plate and the openings and expands and contracts as the support plate moves up and down. The telescopic film, the support plate, and the openings form a dynamic quantitative bin with a variable volume;

[0007] The sample feeding mechanism contains chemical experiment samples and can feed the chemical experiment samples into the dynamic quantitative bin. The sample holding mechanism is used to carry the sample container, and the sample conveying mechanism can connect the telescopic film and the sample container.

[0008] In the above technical solution, the volume of the dynamic quantitative bin is adjusted by the expansion and contraction of the telescopic film. The telescopic film is an integral body, so there will be no situation where chemical experiment samples are stuck in the gaps of the telescopic film.

[0009] Further preferably, when the sample quantitative mechanism is in a non-working state, the telescopic film is in a non-stretched state, and at this time, the volume of the dynamic quantitative bin is the minimum volume of the chemical experiment samples that can be quantitatively dispensed by this device.

[0010] Further preferably, the retractable film is in a bag shape, and the bottom surface of the retractable film is connected to the support plate. In this technical solution, the inner wall of the dynamic metering bin is an integrally formed retractable film bag, further reducing the possibility of powder jamming in the dynamic metering bin.

[0011] In some preferred implementation manners, the sample conveying mechanism includes a sample conveying bin, two air pipes, two pneumatic grippers, a sealed bin, and a lifting and adjusting cylinder;

[0012] The sample conveying bin is formed with a sample inlet and a sample outlet at its bottom. In the direction from the sample inlet to the sample outlet, the height of the main body bottom surface of the sample conveying bin gradually decreases;

[0013] The sample outlet is hermetically connected to one air pipe, and the sample outlet can be communicated with the sample container through the air pipe; both ends of the other air pipe are hermetically connected to the sample inlet and the sealed bin respectively, and the sample inlet can be communicated with the dynamic metering bin through the air pipe and the sealed bin; the two pneumatic grippers are respectively movably clamped on one air pipe, and the pneumatic grippers control the air pipe to be ventilated or closed;

[0014] The sealed bin is provided with a first ventilation pipe for blowing air from the sealed bin towards the air pipe direction; the cavity of the sample conveying bin is provided with a second ventilation pipe on the side close to the sample inlet for sucking the gas in the sample conveying bin or blowing air from the side wall of the sample conveying bin close to the sample inlet towards the side wall close to the sample outlet;

[0015] The lifting and adjusting cylinder has a bracket that can move up and down. The two pneumatic grippers and the sample conveying bin are respectively fixedly connected to the bracket, and the lifting and adjusting cylinder controls the sample conveying bin, the air pipe, the pneumatic grippers, and the sealed bin to move up and down through the bracket.

[0016] In the above technical solution, by designing the shape of the sample conveying bin, it is made easier for the chemical experiment sample to fall into the sample outlet side after being sucked into the sample conveying bin. The pneumatic gripper can block the connection between the air pipe and the connected components.

[0017] In some preferred implementation manners, the sample holding mechanism includes a second turntable, a clamping device, and a photoelectric sensor. The cross-sectional shape of the sample container is a straight cylinder type or a type with a wider upper part and a narrower lower part;

[0018] The second turntable is provided with a plurality of container insertion holes along its circumferential direction at the edge. The clamping device is arranged on the lower surface of the second turntable and corresponds to the positions of the container insertion holes. The sample container is inserted into the container insertion hole of the second turntable and clamped by the clamping device;

[0019] The photoelectric sensor is arranged above the edge of the second turntable. When the sample container is placed on the second turntable, the top of the sample container is not higher than the bottom of the photoelectric sensor;

[0020] The corresponding position of the photoelectric sensor on the second turntable is the placement position. When the photoelectric sensor is blocked, the clamp located at the placement position is in the released state. When the photoelectric sensor is not blocked, the clamp located at the placement position is in the clamped state.

[0021] In the above technical solution, the sample holding mechanism adapts to sample containers of different sizes through the cooperation of the container jack and the clamp. The photoelectric sensor can detect whether the sample container has been inserted into the designated position on the second turntable, and the clamp determines whether to clamp or release according to the detection signal of the photoelectric sensor. Specifically, when the photoelectric sensor is blocked, it indicates that the sample is being inserted into the container jack but has not reached the designated position. At this time, the clamp needs to be released to facilitate the insertion of the sample container. On the contrary, it indicates that the sample container has been inserted into the designated position, and at this time, the clamp is clamped to fix the sample container. In addition, since the clamp clamps immediately when the photoelectric sensor is not blocked, the distance between the top of the sample containers of different lengths and the second turntable remains the same, which is the vertical distance from the upper surface of the second turntable to the bottom of the photoelectric sensor.

[0022] In some preferred implementation manners, the sample feeding mechanism includes a hopper and a valve. The bottom of the valve cooperates with the discharge port of the hopper and controls the opening and closing of the discharge port. The valve is provided with a valve rod extending downward from the lower surface. The first turntable is provided with a valve adjusting block near the opening. The valve adjusting block has a guiding inclined surface. When the valve adjusting block moves towards the valve rod, the valve rod moves upward along the guiding inclined surface and drives the valve away from the discharge port.

[0023] In the above technical solution, the valve adjusting block can adjust and control the state of the valve. The valve adjusting block has a guiding inclined surface. Further preferably, the longitudinal section of the valve adjusting block can be triangular or trapezoidal. When the valve adjusting block moves with the first turntable to below the valve rod, the valve rod is lifted by the guiding inclined surface and the valve opens. When the valve adjusting block is not below the valve rod, the valve will descend under the action of gravity and the pressure of the chemical experiment sample, thereby closing the discharge port.

[0024] In some preferred implementation manners, the valve is a hollow cone structure. The cone structure facilitates the valve to push aside the chemical experiment sample above when rising, and the hollow part is to prevent the valve from being blocked by the chemical experiment sample falling below the valve when descending.

[0025] In some preferred implementation manners, the sample container is a test tube or a centrifuge tube.

[0026] In some preferred implementation manners, the clamp includes a housing, a clamping ring, an iron sheet, an electromagnet and a spring;

[0027] The housing is provided with a clamping hole, the aperture of the clamping hole is larger than that of the container insertion hole, a clamping ring is arranged in the clamping hole, the clamping ring is arc-shaped, the clamping ring is connected to the iron sheet at the opening of the arc shape, and the other end of the clamping ring relative to the opening is connected to the housing through a spring;

[0028] The electromagnet is arranged at one end of the housing close to the opening and cooperates with the iron sheet for adsorption.

[0029] In the above technical solution, when the electromagnet is powered on, the iron sheet moves towards the electromagnet, and the clamping ring cooperates with the clamping hole to achieve clamping. At this time, the spring is in an extended state. When the electromagnet is powered off, the spring returns to its original length, and the clamping ring moves away from the electromagnet, making the clamp in a released state.

[0030] In some preferred implementation manners, the sample loading mechanism further includes a lifting tray, the lifting tray is arranged below the edge of the second turntable, and the corresponding position of the lifting tray on the second turntable is the taking-out position;

[0031] When the container insertion hole rotates to the taking-out position along with the second turntable, the lifting tray rises to abut against the sample container, and the clamp at the taking-out position is released.

[0032] In the above technical solution, the lifting tray is used to hold the sample container to be taken out to prevent it from falling out of the second turntable after the clamp is released.

[0033] In some preferred implementation manners, a vibrator is arranged at the bottom of the support plate, and the vibrator is configured to vibrate at a low frequency when the dynamic metering bin is filled with chemical experiment samples, and vibrate at a high frequency when the dynamic metering bin is communicated with the sample conveying mechanism.

[0034] In the above solution, the vibrator vibrates to make the chemical experiment samples in the dynamic metering bin shake. Specifically, the low-frequency vibration makes the chemical experiment samples evenly fill the dynamic metering bin, and the high-frequency vibration can make the chemical experiment samples move more violently, ensuring that the chemical experiment samples can all break away from the dynamic metering bin and be conveyed to the sample conveying mechanism and the sample loading mechanism, improving the metering accuracy of the device.

[0035] In some preferred implementation manners, the support plate driving assembly includes a motor, a lead screw and a guide rod; multiple guide rods are arranged in a ring opening, the support plate is provided with a plurality of guide holes, the support plate is sleeved with the guide rods through the guide holes, and the motor is connected to the support plate through the lead screw; the motor controls the up and down movement of the support plate along the guide rod through the lead screw transmission.

[0036] In some preferred implementation manners, a scraper is arranged on the outer side of the bottom of the hopper, and the scraper is attached to the upper surface of the first turntable. Further preferably, the scraper is made of rubber.

[0037] In the above technical solution, the scraper is closely attached to the first turntable, which can gather the chemical experiment samples scattered on the first turntable and scrape off the chemical experiment samples exceeding the volume of the dynamic quantitative bin. These powders will fall into the next dynamic quantitative bin.

[0038] In some preferred implementation manners, a sealing cover plate is provided at the lower end of the air pipe connected to the sample outlet, and the air pipe can be hermetically connected to the sample container through the sealing cover plate.

[0039] Since the shape of the air pipe cannot be adapted to all sample containers, in the above technical solution, by providing the sealing cover plate, the air pipe can be hermetically connected to the sample container, so that the device can be applicable to various sample containers of different sizes.

[0040] In some preferred implementation manners, a sealing ring is provided at the lower end of the sealing bin, and the sealing bin is hermetically connected to the dynamic quantitative bin through the sealing ring.

[0041] In some preferred implementation manners, the material of the retractable film is rubber.

[0042] An automatic quantitative dispensing method for chemical experiment samples is realized by the above automatic quantitative dispensing device for chemical experiment samples. The method for quantitatively dispensing chemical experiment samples includes the following steps:

[0043] (1) Place the sample container into the sample loading mechanism;

[0044] (2) Convert the mass of the required chemical experiment sample into the volume of the chemical experiment sample, and the support plate driving assembly controls the support plate to move up and down until the volume of the dynamic quantitative bin is equivalent to the volume of the chemical experiment sample;

[0045] (3) The first turntable rotates until a dynamic quantitative bin is located directly below the sample feeding mechanism, and the chemical experiment sample flows into the dynamic quantitative bin from the sample feeding mechanism;

[0046] (4) After the dynamic quantitative bin is filled, the first turntable and the second turntable respectively rotate to the preset positions, and the lifting and adjusting air cylinder drives the sample conveying bin, the air pipe, the pneumatic gripper and the sealing bin to move downward. The dynamic quantitative bin filled with the chemical experiment sample is hermetically connected to the sealing bin, and a sample container is hermetically connected to an air pipe;

[0047] (5) The two pneumatic grippers respectively close the two air pipes, and the external device exhausts air through the second air pipe;

[0048] (6) The air pipe connected to the sealing bin is ventilated, the sealing bin and the sample conveying bin are communicated, the support plate moves upward to reduce the volume of the dynamic quantitative bin, and at the same time the first air pipe and the second air pipe are respectively communicated with the external environment, and the external environment blows air into the sample conveying bin through the first air pipe and the second air pipe;

[0049] (7) The trachea connected to the sample container is ventilated, and the chemical experiment sample falls from the sample delivery bin into the sample container.

[0050] (8) Repeat steps (5) to (7) until all the chemical experiment samples in the dynamic quantitative bin are transported to the sample container, and then take out the sample container.

[0051] In some preferred implementation manners, the vibrator vibrates at a low frequency in step (2) to evenly fill the dynamic quantitative bin with the chemical experiment sample and reduce the gaps between the chemical experiment samples; the vibrator vibrates at a high frequency in step (6) to make the chemical experiment sample move more violently, ensuring that all the chemical experiment samples can completely break away from the dynamic quantitative bin and be transported to the sample delivery mechanism and the sample holding mechanism, thereby improving the quantitative accuracy of the device.

[0052] The present invention has at least the following beneficial effects:

[0053] 1. The automatic quantitative dispensing device for chemical experiment samples provided by the present invention has a dynamic quantitative bin with a variable volume, which can quantitatively dispense chemical experiment samples of different masses. The dynamic quantitative bin adjusts the volume inside the bin by stretching a stretchable film. Since the film is an integral part and there is no splicing part, this method can effectively avoid the chemical experiment sample getting stuck in the gap compared with the existing method of adjusting the relative position of two parts to adjust the volume.

[0054] 2. In some possible implementation manners, the structural environment of the sample delivery mechanism is simple and there is no filter screen, which can avoid the dispensing error caused by the chemical experiment sample getting stuck in the gap or adhering to the filter screen. Further, by improving the structure of the sample delivery bin and combining various means such as vibrator vibration, negative pressure adsorption of the sample delivery bin, and blowing through the ventilation pipe, the smooth transportation of the chemical experiment sample can be effectively guaranteed.

[0055] 3. In some possible implementation manners, the sample holding mechanism can be compatible with sample containers of different lengths and diameters by setting an optoelectronic sensor and a clamp, which is convenient for placing the sample container. In addition, the cooperation of the optoelectronic sensor and the clamp can also ensure that the tops of different-sized sample containers are at the same height after being inserted into the second turntable, so that the sample delivery mechanism can maintain a good sealing effect with the sample container. Description of the Drawings

[0056] Figure 1 Front structural schematic diagram of the automatic quantitative dispensing device for chemical experiment samples provided in Embodiment 1;

[0057] Figure 2 Back structural schematic diagram of the automatic quantitative dispensing device for chemical experiment samples provided in Embodiment 1;

[0058] Figure 3 The right - view cross - sectional view of the sample feeding mechanism and the sample metering mechanism in Embodiment 1, where the discharge port is in the closed state;

[0059] Figure 4 The right - view cross - sectional view of the sample feeding mechanism and the sample metering mechanism in Embodiment 1, where the discharge port is in the open state;

[0060] Figure 5 For Figure 2 The enlarged view of part A in

[0061] Figure 6 The structural schematic diagram of the sample metering mechanism in Embodiment 1, with the valve adjusting block omitted in the figure;

[0062] Figure 7 For Figure 6 The enlarged view of part C in

[0063] Figure 8 For Figure 4 The enlarged view of part E in

[0064] Figure 9 The structural schematic diagram of the sample conveying mechanism in Embodiment 1;

[0065] Figure 10 For Figure 2 The enlarged view of part B in

[0066] Figure 11 The top - view of the clamp in Embodiment 1, where the clamp is in the open state at this time;

[0067] Figure 12 For Figure 11 The transverse cross - sectional view of part D in

[0068] Figure 13 The top - view of the clamp in Embodiment 1, where the clamp is in the clamped state at this time.

[0069] Reference numerals in the figures: 1 - sample feeding mechanism, 11 - hopper, 111 - discharge port, 112 - valve rod guide hole, 113 - scraper, 12 - valve, 121 - valve rod, 2 - sample metering mechanism, 21 - first turntable, 211 - opening, 22, 26, 42 - motor, 23 - valve adjusting block, 231 - guiding surface, 24 - retractable film, 25 - support plate, 27 - lead screw, 28 - guide rod, 29 - vibrator, 3 - sample conveying mechanism, 31 - sample conveying bin, 311 - sample inlet, 312 - sample outlet, 313 - second ventilation pipe, 32 - air pipe, 321 - sealing cover plate, 33 - pneumatic gripper, 34 - sealed bin, 341 - first ventilation pipe, 342 - sealing ring, 35 - lifting and adjusting cylinder, 351 - push rod, 352 - bracket, 4 - sample containing mechanism, 41 - second turntable, 411 - container jack, 43 - clamping device, 431 - housing, 432 - electromagnet, 433 - iron sheet, 434 - clamping ring, 435 - spring, 44 - photoelectric sensor, 45 - lifting tray, 5 - sample container. Detailed implementation manners

[0070] The technical solutions of the present invention will be further described and illustrated through specific implementation manners below.

[0071] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the preferred embodiments of the present invention and should not be regarded as excluding other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0072] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, for orientation terms, such as the use of terms "top", "bottom", "inside", "outside", "upper", "lower", "front", "rear", etc. to indicate orientation or position relationship are based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention.

[0073] In the following embodiments, the first turntable and the second turntable are driven by a motor. In other possible implementation manners, the first turntable and the second turntable can also be driven by other driving manners well-known to those skilled in the art. The second ventilation pipe can exhaust the inside of the device through an external device. Or, when the sealed chamber or the sample delivery chamber is in a negative pressure state, the first ventilation pipe and the second ventilation pipe can blow air into the device by connecting to the external environment. In the following embodiments, the external device is a vacuum generator. In other possible implementation manners, the external device can also be other exhaust devices well-known to those skilled in the art. The chemical experiment sample in this article is in powder form.

[0074] Embodiment 1

[0075] Figure 1 and Figure 2 show the overall structure of the automatic quantitative dispensing device for chemical experiment samples provided in this embodiment. As shown in the figure, it includes a sample feeding mechanism 1, a sample quantitative mechanism 2, a sample conveying mechanism 3, and a sample holding mechanism 4. Among them, the sample feeding mechanism 1 is used to hold the chemical experiment samples (hereinafter referred to as samples) to be dispensed and convey the samples to the sample quantitative mechanism 2. The sample quantitative mechanism 2 can hold a quantitative sample as needed and cooperate with the sample conveying mechanism 3 to convey the sample. The sample conveying mechanism 3 can convey the sample from the sample quantitative mechanism 2 to the sample holding mechanism 4. The sample holding mechanism 4 is used to place the sample container 5 and hold the sample in the sample container 5. In this embodiment, the sample container 5 is a centrifuge tube.

[0076] Next, refer to Figure 3 and Figure 5 , the sample feeding mechanism 1 is composed of a hopper 11 and a conical valve 12. The valve 12 is provided with a valve rod 121 extending downward from its lower surface. The hopper 11 is provided with a valve rod guiding hole 112 that penetrates up and down at the discharge port 111. The valve rod 121 is sleeved in the valve rod guiding hole 112. A valve adjusting block 23 is provided on the sample quantitative mechanism 2. The valve adjusting block 23 has a guiding surface 231. The longitudinal section of the valve adjusting block 23 is a right trapezoid. The valve rod 121 can move up and down under the guidance of the valve adjusting block 23 of the sample quantitative mechanism 2, thereby adjusting the state of the valve 12. The valve 12 is designed as a hollow conical structure, which is convenient for the valve 12 to push away the upper sample when it rises. The inside of the valve 12 is hollow, which can prevent the valve 12 from being blocked by the sample flowing into the lower part of the valve 12 when it descends.

[0077] Specifically, as Figure 2 shown, when the valve adjusting block 23 is not below the valve rod 121, the valve 12 will move downward under the action of gravity and the pressure of the sample, and the discharge port 111 of the hopper 11 will be closed, as Figure 3As shown, when the valve adjustment block 23 is located below the valve rod 121, the valve rod 121 is pushed up by the valve adjustment block 23, the valve 12 moves upward, and the discharge port 111 of the hopper 11 opens.

[0078] As Figure 5 shown, the hopper 11 is also provided with a V-shaped scraper 113. The scraper 113 is made of rubber and can closely adhere to the first turntable 21 of the sample metering mechanism 2 to gather the samples scattered on the first turntable 21.

[0079] As Figure 6 and Figure 7 shown, the sample metering mechanism 2 includes a first turntable 21, a valve adjustment block 23 (not shown in the figure, please refer to Figures 3 - 5 ), a telescopic film 24, a support plate 25, and a support plate drive assembly.

[0080] The first turntable 21 is driven by a motor 22. The first turntable 21 is provided with a plurality of dynamic metering bins equidistantly arranged in the circumferential direction along its edge. As Figure 1 and Figure 2 shown, the valve adjustment block 23 is arranged outside the dynamic metering bin, and the valve adjustment block 23 can rotate synchronously with the dynamic metering bin and enter below the hopper 11.

[0081] Returning to Figure 6 and Figure 7 , a number of rectangular openings 211 are equidistantly opened in the circumferential direction along the edge of the first turntable 21. One end of the telescopic film 24 is fixed around the openings 211, and the other end is fixed on the support plate 25. The openings 211, the telescopic film 24, and the support plate 25 together form the dynamic metering bin. The telescopic film 24 is made of rubber, and the telescopic film 24 has only one opening 211 above, and the other parts are an integral whole.

[0082] As Figure 7 shown and Figure 8 , the support plate drive assembly includes a motor 26, a lead screw 27, and a guide rod 28. Four guide rods 28 are installed on the lower surface of the first turntable 21. The support plate 25 is sleeved on the four guide rods 28, and the support plate 25 is also threadedly connected to the lead screw 27. The lead screw 27 is driven by the motor 26. When the motor 26 rotates, it can drive the support plate 25 to move up and down, and the telescopic film 24 will expand and contract with the movement of the support plate 25. In this way, the volume of the dynamic metering bin can be adjusted, and because the telescopic film 24 is an integral whole except for the opening 211, there will be no situation where powder gets stuck in the gap. In addition, a vibrator 29 is installed below the support plate 25, and the powder in the dynamic metering bin can be vibrated.

[0083] As Figure 9As shown in the figure, the sample conveying mechanism 3 includes a sample conveying bin 31, two air pipes 32, two pneumatic grippers 33, a sealing bin 34, and a lifting and adjusting cylinder 35. A bracket 352 is fixedly installed at the end of the push rod 351 of the lifting and adjusting cylinder 35. The bracket 352 can move up and down by the telescopic movement of the push rod 351. The sample conveying bin 31 and the two pneumatic grippers 33 are respectively fixedly installed on the bracket 352.

[0084] The sample conveying bin 31 forms a downward sample inlet 311 and a sample outlet 312 at its bottom. The sample inlet 311 and the sample outlet 312 are respectively connected to an air pipe 32. The air pipe 32 connected to the sample outlet 312 is provided with a sealing cover plate 321 at the other end. The air pipe 32 can be hermetically connected and communicated with the sample container 5 through the sealing cover plate 321. The air pipe 32 connected to the sample inlet 311 is connected to the sealing bin 34 at the other end. The air pipe 32 can be communicated with the dynamic metering bin through the sealing bin 34. The two air pipes 32 are respectively movably clamped by a pneumatic gripper 33. The two pneumatic grippers 33 can clamp the air pipe 32 to block the communication between the sample conveying bin 31, the sealing bin 34, and the sample container 5.

[0085] A first ventilation pipe 341 inclined upward is provided on the sealing bin 34. The first ventilation pipe 341 communicates with the external environment. The external environment blows air from the sealing bin 34 towards the air pipe 32 through the first ventilation pipe 341. A horizontal second ventilation pipe 313 is provided on the sample conveying bin 31. The second ventilation pipe 313 communicates with the external environment. The external environment blows air into the sample conveying bin 31 from right to left through the second ventilation pipe 313, or the second ventilation pipe 313 exhausts the sample conveying bin 31 through an external device.

[0086] The right side of the sample conveying bin 31 is higher, and the included angle at the bending part is relatively small. The left side of the sample conveying bin 31 is lower, and the included angle at the bending part is relatively large. This structure enables the sample to be sucked up from the right side and then fall into the left side after being blown by the second ventilation pipe 313.

[0087] Furthermore, a sealing ring 342 is provided below the sealing bin 34, which can achieve a better sealing effect when the sealing bin 34 is pressed on the first turntable 21.

[0088] As Figure 10 shown, the sample loading mechanism 4 includes a second turntable 41, a clamping device 43, a photoelectric sensor 44, and a lifting tray 45.

[0089] The second turntable 41 is driven by a motor 42. A number of container insertion holes 411 are provided along the circumferential direction at its edge for inserting the sample container 5. A clamping device 43 is installed below each container insertion hole 411 to be responsible for clamping the sample container 5.

[0090] The photoelectric sensor 44 is arranged above the edge of the second turntable 41. When the sample container 5 is carried on the second turntable 41, the top of the sample container 5 is not higher than the bottom of the photoelectric sensor 44. The corresponding position of the photoelectric sensor 44 on the second turntable 41 is the placement position. When the sample container 5 located at the placement position blocks the optical signal in the middle of the opposed photoelectric sensor 44, the clamp 43 is always in the released state. When the sample container 5 moves downward and no longer blocks the opposed photoelectric sensor 44, the clamp 43 clamps to fix the sample container 5.

[0091] The lifting tray 45 is arranged below the edge of the second turntable 41. The corresponding position of the lifting tray 45 on the second turntable 41 is the removal position. When the sample container 5 moves to the removal position along with the rotation of the second turntable 41, the lifting tray 45 rises to support the sample container 5, the clamp 43 is released, and the sample container 5 can be removed.

[0092] As Figures 11 - 13 shown, the clamp 43 is composed of a housing 431, an electromagnet 432, an iron sheet 433, a clamping ring 434 and a spring 435. The iron sheet 433 and the clamping ring 434 are fixedly connected. When the electromagnet 432 is powered off, the clamping ring 434 is at the rightmost position under the action of the spring 435, and at this time the clamp 43 is in the released state. As Figure 13 shown, when the electromagnet 432 is powered on, the iron sheet 433 is adsorbed on the electromagnet 432, the clamping ring 434 is at the leftmost position, the spring 435 is compressed, and the clamp 43 is in the clamped state.

[0093] The above structure can ensure that the sample loading mechanism 4 can be compatible with sample containers 5 of different diameters and lengths, and for sample containers 5 of different lengths, it can also ensure that the distance between their upper edges and the second turntable 41 remains the same.

[0094] Next, the chemical experiment sample quantitative dispensing method provided in this embodiment will be described, which specifically includes the following steps:

[0095] (1) Place the sample container 5 into the sample loading mechanism

[0096] The second turntable 41 rotates to move a container jack 411 to the placement position. The sample container 5 is lowered from above the placement position manually or by a robotic arm, and the sample container 5 is released. The sample container 5 falls into the lower container jack 411. At this time, because the sample container 5 blocks the photoelectric sensor 44, the clamp 43 is in the released state. The sample container 5 continues to fall until its upper edge is lower than the photoelectric sensor 44, the signal state of the photoelectric sensor 44 changes, and the clamp 43 immediately clamps to hold the sample container 5.

[0097] (2) Calibrate the weight - volume relationship of the required powder sample to obtain the corresponding relationship between mass and volume, and convert the mass of the required chemical experiment sample into the volume of the chemical experiment sample. The motors 26 of each dynamic metering bin are started, the support plate 25 moves downward, and the stretchable film 24 is stretched accordingly, so that the volume of the dynamic metering bin is equivalent to the volume of the chemical experiment sample.

[0098] (3) The first turntable 21 rotates until a dynamic metering bin is located directly below the hopper 11. The valve rod 121 moves upward along the guiding surface of the valve adjusting block 23, and the valve 12 is lifted by the valve rod 121, and the discharge port 111 of the hopper 11 is opened, and the sample falls from the hopper 11 into the dynamic metering bin. During the falling process of the sample, the vibrator 29 below the support plate 25 performs multiple low - frequency vibrations periodically to evenly fill the chemical test sample in the dynamic metering bin and avoid voids.

[0099] (4) The first turntable 21 stops for a preset time to ensure that the dynamic metering bin is filled with the chemical experiment sample. Then, the first turntable 21 rotates, and the scraper 113 scrapes across the top of the dynamic metering bin to level the sample and gather the excess sample, and these samples will fall into the next dynamic metering bin. At the same time, since the valve adjusting block 23 leaves the valve rod 121, the valve rod 121 and the valve 12 fall to close the discharge port 111, and the sample stops falling.

[0100] (5) When the first turntable 21 rotates, the dynamic metering bin filled with the sample moves directly below the sealed bin 34, and then the second turntable 41 rotates so that a sample container 5 is exactly located directly below the air pipe 32 connected to the sample outlet 312.

[0101] (6) The lifting and adjusting cylinder 35 works, driving the sample delivery bin 31, the air pipe 32, the pneumatic gripper 33 and the sealed bin 34 to move downward until the sealed bin 34 is hermetically connected to the dynamic metering bin filled with the sample through the sealing ring 342, and the air pipe 32 of the sample outlet 312 is hermetically connected to the sample container 5 through the sealing cover plate 321.

[0102] (7) The two pneumatic grippers 33 respectively seal the two air pipes 32, and the external vacuum generator exhausts air outward through the second air pipe 313 to reduce the air pressure in the sample delivery bin 31.

[0103] The pneumatic gripper 33 above the sealed chamber 34 is opened, and the air pipe 32 connected to the sealed chamber 34 is ventilated, so that the sealed chamber 34 communicates with the sample delivery chamber 31. The support plate 25 moves upward to reduce the volume of the dynamic metering chamber. At the same time, the first air pipe 341 and the second air pipe 313 are respectively communicated with the external environment. Since the sample delivery chamber 31 is in a negative pressure state, the external environment blows air through the first air pipe 341 in the direction close to the sample inlet 311, driving the sample to move upward into the sample delivery chamber 31. At the same time, the external environment blows air through the second air pipe 313 in the direction of the sample outlet 312 (in this embodiment, this direction is from right to left), driving the sample in the sample delivery chamber 31 to move leftward in the sample delivery chamber 31. During this process, the vibrator 29 on the dynamic metering chamber generates high-frequency vibration, enabling the sample to move more violently, ensuring that the sample can completely break away from the dynamic metering chamber and be transported into the sample delivery chamber 31.

[0104] (9)The pneumatic gripper 33 above the sample container 5 is opened, and the air pipe 32 connected to the sample container 5 is ventilated, and the chemical experiment sample falls from the sample delivery chamber 31 into the sample container 5.

[0105] (10)Repeat steps (7) to (9) until all the chemical experiment samples in the dynamic metering chamber are transported into the sample container 5.

[0106] (11)Take out the sample container 5

[0107] The second turntable 41 rotates, and the sample container 5 containing the sample moves to the take-out position. The lifting tray 45 will rise according to the length of the sample container 5 to hold the sample container 5. At this time, the clamping device 43 automatically loosens, and the sample container 5 is taken away by a human or a robotic arm.

[0108] The above is only the preferred embodiment of the present invention, so the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. A chemical experiment sample automatic quantitative packaging device, characterized in that: It includes a sample delivery mechanism, a sample quantitative mechanism, a sample conveying mechanism and a sample containing mechanism; The sample quantitative mechanism comprises a first turntable, a retractable film, a support plate and a support plate driving assembly, wherein the first turntable is provided with a plurality of openings in the circumferential direction of the edge ring, the support plate is located below the openings, the support plate driving assembly drives the support plate to move up and down, the retractable film connects the support plate and the openings and retracts as the support plate moves up and down, and the retractable film, the support plate and the openings form a dynamic quantitative chamber with a variable volume; The sample delivery mechanism contains the chemical experiment sample and can deliver the chemical experiment sample into the dynamic quantitative chamber, the sample holding mechanism is used to carry the sample container, and the sample conveying mechanism can connect the retractable film and the sample container; The sample conveying mechanism comprises a sample conveying chamber, two air pipes, two pneumatic clamps, a sealing chamber and a lifting and lowering regulating cylinder; The sample delivery chamber is formed with a sample inlet and a sample outlet at the bottom thereof, and the height of the bottom surface of the main body of the sample delivery chamber gradually decreases from the sample inlet to the sample outlet; The sample outlet is sealed and connected to one of the air pipes, and the sample outlet can be communicated with the sample container through the air pipe; the two ends of the other air pipe are sealed and connected to the sample inlet and the sealing chamber respectively, and the sample inlet can be communicated with the dynamic quantitative chamber through the air pipe and the sealing chamber; the two pneumatic clamps are respectively clamped with one of the air pipes, and the pneumatic clamps control the ventilation or sealing of the air pipe; The sealed chamber is provided with a first vent pipe for blowing air from the sealed chamber toward the trachea; the cavity of the sample delivery chamber is provided with a second vent pipe on a side close to the sample inlet for sucking gas in the sample delivery chamber or blowing air from the side wall of the sample delivery chamber close to the sample inlet toward the side wall close to the sample outlet; The lifting and adjusting cylinder has a bracket that can move up and down, and the two pneumatic clamps and the sample conveying chamber are fixedly connected to the bracket respectively. The lifting and adjusting cylinder controls the sample conveying chamber, the air pipe, the pneumatic clamps and the sealing chamber to move up and down through the bracket.

2. The automatic quantitative packaging device for chemical experiment samples according to claim 1, characterized in that: The sample holding mechanism comprises a second rotating disk, a clamp and a photoelectric sensor, and the cross-sectional shape of the sample container is a straight cylinder or a wide-upper-narrow-lower-type; The second turntable is provided with a plurality of container insertion holes in the circumferential direction of the edge ring, the clamp is arranged on the lower surface of the second turntable and corresponds to the position of the container insertion holes, the sample container and the second turntable are inserted into the container insertion holes and clamped by the clamp; The photoelectric sensor is arranged above the edge of the second turntable, and when the sample container is carried on the second turntable, the top of the sample container is not higher than the bottom of the photoelectric sensor; The corresponding position of the photoelectric sensor on the second turntable is the placement position. When the photoelectric sensor is blocked, the clamp at the placement position is in a loosened state. When the photoelectric sensor is not blocked, the clamp at the placement position is in a clamped state.

3. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 2, characterized in that: The sample delivery mechanism includes a hopper and a valve, and the bottom of the valve cooperates with the discharge port of the hopper and controls the opening and closing of the discharge port; The valve is provided with a valve stem extending downward from the lower surface, and the first turntable is provided with a valve adjusting block near the opening, and the valve adjusting block has a guide slope. When the valve adjusting block moves toward the direction close to the valve stem, the valve stem moves upward along the guide slope and drives the valve to leave the discharge port.

4. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 2, characterized in that: The clamping device comprises a housing, a clamping ring, an iron sheet, an electromagnet and a spring; The shell is provided with a clamping hole, the aperture of the clamping hole is larger than the aperture of the container insertion hole, the clamping ring is arranged in the clamping hole, the clamping ring is in an arc shape, the clamping ring is connected to the iron sheet at the opening of the arc shape, and the other end of the clamping ring relative to the opening is connected to the shell through a spring; The electromagnet is arranged at one end of the housing close to the opening and cooperates with the iron sheet for adsorption.

5. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 2, characterized in that: The sample holding mechanism further includes a lifting tray, which is arranged below the edge of the second turntable, and the corresponding position of the lifting tray on the second turntable is a taking-out position; When the container insertion hole rotates to the removal position along with the second turntable, the lifting tray rises to abut against the sample container, and the clamp located at the removal position is released.

6. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 2, characterized in that: The retractable film is in a bag, and the bottom surface of the retractable film is connected to the support plate; And / or, a vibrator is provided at the bottom of the support plate, and the vibrator is configured to vibrate at a low frequency when the chemical experiment sample is contained in the dynamic quantitative chamber, and vibrate at a high frequency when the dynamic quantitative chamber is connected to the sample delivery mechanism; And / or, the support plate driving assembly includes a motor, a lead screw and a guide rod; a plurality of guide rods are arranged around the opening, the support plate is provided with a plurality of guide holes, the support plate is sleeved with the guide rods through the guide holes, and the motor is connected to the support plate through the lead screw; the motor controls the support plate to move up and down along the guide rod through the lead screw transmission.

7. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 3, characterized in that: The valve is a hollow cone structure; And / or, a scraper is provided on the outer side of the bottom of the hopper, and the scraper is in contact with the upper surface of the first turntable.

8. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 2, characterized in that: A sealing cover plate is provided at the lower end of the air pipe connected to the sample outlet, and the air pipe can be sealed and connected to the sample container through the sealing cover plate; A sealing ring is provided at the lower end of the sealing bin, and the sealing bin is sealed and connected to the dynamic quantitative bin via the sealing ring.

9. A method for automatic quantitative packaging of chemical experiment samples, characterized in that: The automatic quantitative packaging device for chemical experiment samples according to any one of claims 3 to 8 is used to achieve the automatic quantitative packaging method for chemical experiment samples, which comprises the following steps: (1) Place the sample container into the sample holding mechanism; (2) converting the mass of the required chemical experiment sample into the volume of the chemical experiment sample, and controlling the support plate driving assembly to move the support plate up and down until the volume of the dynamic quantitative chamber is equivalent to the volume of the chemical experiment sample; (3) The first turntable rotates until a dynamic quantitative chamber is located directly below the sample delivery mechanism, and the chemical experiment sample flows from the sample delivery mechanism into the dynamic quantitative chamber; (4) After the dynamic quantitative chamber is filled, the first turntable and the second turntable rotate to preset positions respectively, and the lifting and adjusting cylinder drives the sample delivery chamber, the air pipe, the pneumatic clamp and the sealing chamber to move downward, and the dynamic quantitative chamber containing the chemical experiment sample is sealed and connected to the sealing chamber, and the sample container is sealed and connected to the air pipe; (5) The two pneumatic clamps respectively seal the two air pipes, and the external device exhausts air to the outside through the second ventilation pipe; (6) The air pipe connected to the sealed chamber is ventilated, the support plate moves upward to reduce the volume of the dynamic quantitative chamber, and at the same time, the first ventilation pipe and the second ventilation pipe are respectively connected to the external environment, and the external environment blows air into the sample delivery chamber through the first ventilation pipe and the second ventilation pipe; (7) The trachea connected to the sample container is ventilated, and the chemical experiment sample falls from the sample delivery chamber into the sample container; (8) Repeat steps (5) to (7) until all the chemical experiment samples in the dynamic quantitative chamber are transported to the sample container, and then take out the sample container.

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