Automatic quantitative split charging device and method for chemical experiment samples

Abstract

The invention discloses an automatic quantitative subpackaging device and method for chemical experiment samples, the device is provided with a dynamic quantitative bin with variable volume, and the chemical experiment samples can be quantitatively subpackaged according to the required mass. According to the dynamic quantitative bin, the volume in the bin is adjusted by stretching the stretchable thin film, and as the thin film is an integral body and has no spliced part, compared with an existing method for adjusting the volume by adjusting the relative position of two parts, the mode can effectively prevent chemical experiment samples from being clamped in a gap. The sample conveying mechanism is simple in structural environment and free of a filter screen, and split charging errors caused by the fact that chemical experiment samples are clamped in gaps or attached to the filter screen can be avoided. Furthermore, by improving the structure of the sample conveying bin and combining various means such as vibration of a vibrator, negative pressure adsorption of the sample conveying bin and blowing of a breather pipe, smooth conveying of chemical experiment samples can be effectively guaranteed.

Description

Technical Field

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

[0002] In the process of chemical experiment sample analysis, the samples need to be packaged into multiple portions as required and placed in centrifuge tubes. The existing chemical experiment powder packaging method usually uses a quantitative spoon or an electronic scale to manually weigh the sample to obtain the required weight, and then manually put the sample into the centrifuge tube. This method is time-consuming and labor-intensive, and cannot meet the needs of laboratory automation. Summary of the invention

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

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

[0005] The invention discloses an automatic quantitative dispensing device for chemical experiment samples, comprising a sample delivery mechanism, a sample quantitative mechanism, a sample conveying mechanism and a sample containing mechanism;

[0006] The sample quantitative mechanism comprises a first turntable, a retractable film, a support plate and a support plate driving assembly. 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. The retractable film, the support plate and the openings form a dynamic quantitative chamber with a variable volume.

[0007] The sample delivery mechanism holds chemical experiment samples and can deliver the chemical experiment samples into the dynamic quantitative chamber. The sample holding mechanism is used to carry the sample container. The sample conveying mechanism can connect the retractable film and the sample container.

[0008] In the above technical solution, the volume of the dynamic quantitative chamber is adjusted by the expansion and contraction of the expandable film, and the expandable film is a whole, so the chemical experiment sample will not be stuck in the gap of the expandable film.

[0009] Further preferably, when the sample quantification mechanism is in a non-working state, the retractable film is in a non-stretched state, and at this time the volume of the dynamic quantification chamber is the minimum volume of the chemical experiment sample that can be quantified by the device.

[0010] Further preferably, the retractable film is bagged, and the bottom surface of the retractable film is connected to the support plate. In this technical solution, the inner wall of the dynamic quantitative bin is an integrally formed retractable film bag, which further reduces the possibility of powder stuck in the dynamic quantitative bin.

[0011] In some preferred implementations, the sample delivery mechanism includes a sample delivery chamber, two air pipes, two pneumatic clamps, a sealing chamber, and a lifting and lowering adjustment cylinder;

[0012] The sample delivery chamber is formed with a sample inlet and a sample outlet at its bottom, 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;

[0013] The sample outlet is sealed and connected to an air pipe, and the sample outlet can be connected to 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 connected to the dynamic quantitative chamber through the air pipe and the sealing chamber; the two pneumatic clamps are respectively movably clamped with an air pipe, and the pneumatic clamps control the ventilation or sealing of the air pipe;

[0014] The sealed chamber is provided with a first vent pipe for blowing air from the sealed chamber to the trachea; the cavity of the sample delivery chamber is provided with a second vent pipe on the 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 to the side wall close to the sample outlet;

[0015] The lifting and adjusting cylinder has a bracket that can move up and down, and two pneumatic clamps and a 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.

[0016] In the above technical solution, the shape of the sample delivery chamber is designed so that the chemical experiment sample is more likely to fall into the sample outlet side after being sucked into the sample delivery chamber. The pneumatic clamp can block the communication between the air pipe and the connected components.

[0017] In some preferred implementations, the sample holding mechanism includes a second turntable, 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;

[0018] The second rotating disk 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 rotating disk and corresponds to the position of the container insertion holes, the sample container and the second rotating disk are inserted into the container insertion holes and clamped by the clamp;

[0019] The photoelectric sensor is arranged above the edge of the second rotating disk, and when the sample container is carried on the second rotating disk, 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 at the placement position is in a loose state. When the photoelectric sensor is not blocked, the clamp at the placement position is in a clamped state.

[0021] In the above technical solution, the sample holding mechanism can accommodate sample containers of different sizes through the matching of the container socket and the clamp. The photoelectric sensor can detect whether the sample container has been inserted into the designated position of the second turntable, and the clamp determines whether to clamp or loosen according to the detection signal of the photoelectric sensor. Specifically, if the photoelectric sensor is blocked, it means that the sample is being inserted into the container socket but has not yet reached the designated position. At this time, the clamp needs to be loosened to facilitate the insertion of the sample container. Otherwise, it means that the sample container has been inserted into the designated position. At this time, the clamp is clamped to fix the sample container. In addition, since the clamp is clamped immediately when the photoelectric sensor is not blocked, the distance between the top of the sample containers of different lengths and the second turntable is consistent, which is the vertical distance from the upper surface of the second turntable to the bottom of the photoelectric sensor.

[0022] In some preferred implementations, the sample delivery 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 stem from the lower surface downward, and the first rotary disk is provided with a valve regulating block near the opening, and the valve regulating block has a guide slope, and when the valve regulating block moves in a direction close to the valve stem, the valve stem moves upward along the guide slope and drives the valve to leave the discharge port.

[0023] In the above technical solution, the valve regulating block can adjust the state of the control valve, and the valve regulating block has a guiding slope. Further preferably, the longitudinal section of the valve regulating block can be triangular or trapezoidal. When the valve regulating block moves to the bottom of the valve stem along with the first rotating disk, the valve stem is lifted by the guiding slope, and the valve opens. When the valve regulating block is not under the valve stem, the valve will drop under the pressure of gravity and the chemical experimental sample, thereby closing the discharge port.

[0024] In some preferred implementations, the valve has a hollow cone structure. The cone structure facilitates the valve to push away the chemical experiment samples above when it rises, and the hollow structure is to prevent the valve from being blocked by the chemical experiment samples that fall below the valve when it descends.

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

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

[0027] The shell is provided with a clamping hole, the aperture of which is larger than the aperture of the container insertion hole, a 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;

[0028] The electromagnet is arranged at one end of the shell body 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 toward the electromagnet, and the clamping ring cooperates with the clamping hole to achieve clamping, and 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, so that the clamp is in a loosened state.

[0030] In some preferred implementations, the sample holding mechanism further includes a lifting tray, which is disposed below the edge of the second turntable, and the corresponding position of the lifting tray on the second turntable is a removal position;

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

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

[0033] In some preferred implementations, a vibrator is disposed at the bottom of the support plate, and the vibrator is configured to vibrate at a low frequency when the dynamic quantitative chamber is filled with chemical experimental samples, and to vibrate at a high frequency when the dynamic quantitative chamber is connected to the sample delivery mechanism.

[0034] In the above scheme, the vibrator shakes the chemical experiment sample in the dynamic quantitative chamber by vibration. Specifically, low-frequency vibration makes the chemical experiment sample evenly fill the dynamic quantitative chamber, and high-frequency vibration can make the chemical experiment sample move more violently, ensuring that the chemical experiment sample can be completely separated from the dynamic quantitative chamber and transported to the sample transport mechanism and the sample containing mechanism, thereby improving the quantitative accuracy of the device.

[0035] In some preferred implementations, the support plate drive assembly includes a motor, a lead screw and a guide rod; a plurality of guide rods are arranged in an opening ring, a plurality of guide holes are arranged on the support plate, the support plate is sleeved with the guide rods through the guide holes, and the motor is connected to the support plate through a lead screw; the motor controls the support plate to move up and down along the guide rods through the lead screw transmission.

[0036] In some preferred implementations, 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 rotating disk. Further preferably, the scraper is made of rubber.

[0037] In the above technical solution, the scraper is closely attached to the first turntable, and 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, and these powders will fall into the next dynamic quantitative bin.

[0038] In some preferred implementations, a sealing cover 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.

[0039] Since the shape of the air tube cannot be adapted to all sample containers, in the above technical solution, by providing a sealing cover plate, a sealed connection between the air tube and the sample container can be achieved, so that the device can be applicable to sample containers of various sizes.

[0040] In some preferred implementations, a sealing ring is provided at the lower end of the sealing chamber, and the sealing chamber is sealed and connected to the dynamic quantitative chamber via the sealing ring.

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

[0042] A method for automatic quantitative packaging of chemical experiment samples is implemented by the above-mentioned automatic quantitative packaging device for chemical experiment samples. The method for automatic quantitative packaging of chemical experiment samples comprises the following steps:

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

[0044] (2) The mass of the required chemical experiment sample is converted 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 chamber is equivalent to the volume of the chemical experiment sample;

[0045] (3) The first turntable rotates to a dynamic quantitative chamber located directly below the sample delivery mechanism, and the chemical experiment sample flows from the sample delivery mechanism into the dynamic quantitative chamber;

[0046] (4) After the dynamic quantitative chamber is filled, the first turntable and the second turntable rotate to the preset positions respectively, and the lifting and adjusting cylinder drives the sample conveying 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 a sample container is sealed and connected to an air pipe;

[0047] (5) Two pneumatic grippers close two air pipes respectively, and the external equipment exhausts air to the outside through the second ventilation pipe;

[0048] (6) The air pipe connected to the sealed chamber is ventilated, the sealed chamber is connected to the sample delivery chamber, 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;

[0049] (7) The air pipe connected to the sample container is ventilated, and the chemical experiment sample falls into the sample container from the sample delivery chamber;

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

[0051] In some preferred implementations, the vibrator vibrates at a low frequency in step (2) so that the chemical experiment samples evenly fill the dynamic quantitative bin and reduce the gaps between the chemical experiment samples; the vibrator vibrates at a high frequency in step (6) so that the chemical experiment samples move more vigorously, ensuring that the chemical experiment samples can all be separated from the dynamic quantitative bin and transported to the sample transport 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 packaging device for chemical experiment samples provided by the present invention has a dynamic quantitative bin with variable volume, which can quantitatively package chemical experiment samples of different masses. The dynamic quantitative bin uses a stretchable film to adjust the volume of the bin. Since the film is a whole and there is no spliced ​​part, this method can effectively prevent the chemical experiment sample from getting stuck in the gap compared to the existing method of adjusting the relative position of two parts to adjust the volume.

[0054] 2. In some possible implementations, the sample delivery mechanism has a simple structure and does not have a filter, which can avoid the sample from getting stuck in the gap or adhering to the filter, which can cause packaging errors. Furthermore, by improving the structure of the sample delivery bin, combined with a variety of methods such as vibrator vibration, negative pressure adsorption of the sample delivery bin, and ventilation pipe blowing, the smooth delivery of chemical experiment samples can be effectively guaranteed.

[0055] 3. In some possible implementations, the sample holding mechanism can be compatible with sample containers of different lengths and diameters by providing a photoelectric sensor and a clamp, so as to facilitate the placement of the sample container. In addition, the cooperation of the photoelectric sensor and the clamp can also ensure that after the sample containers of different sizes are inserted into the second turntable, their tops are at the same height, so that the sample conveying mechanism can maintain a good sealing effect with the sample container. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A schematic diagram of the front structure of the automatic quantitative packaging device for chemical experiment samples provided in Example 1;

[0057] Figure 2 A schematic diagram of the back structure of the automatic quantitative packaging device for chemical experiment samples provided in Example 1;

[0058] Figure 3 It is a right side cross-sectional view of the sample delivery mechanism and the sample quantitative mechanism in Example 1, wherein the discharge port is in a closed state;

[0059] Figure 4 It is a right side cross-sectional view of the sample delivery mechanism and the sample quantitative mechanism in Example 1, wherein the discharge port is in an open state;

[0060] Figure 5 for Figure 2 The enlarged view of point A in the middle;

[0061] Figure 6 This is a schematic diagram of the structure of the sample quantification mechanism in Example 1, in which the valve adjustment block is omitted;

[0062] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0063] Figure 8 for Figure 4 Enlarged view of point E in the middle;

[0064] Fig. 9 is a schematic structural diagram of the sample delivery mechanism in Example 1;

[0065] Fig.10 for Figure 2 The enlarged view of point B in the middle;

[0066] Fig.11 is a top view of the clamp in Example 1, where the clamp is in an open state;

[0067] Fig.12 for Fig.11 Transverse section view at D in the middle;

[0068] Fig.13 This is a top view of the clamp in Example 1, when the clamp is in a clamped state.

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

[0070] The technical solution of the present invention is further illustrated and described below through specific implementation methods.

[0071] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words, such as the terms "top", "bottom", "inside", "outside", "up", "down", "front", "back", etc., indicating directions or positional relationships are based on the directions and positional relationships 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 direction or be constructed and operated in a specific direction, and therefore 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 implementations, the first turntable and the second turntable can also be driven by other driving methods well known to those skilled in the art. The second vent pipe can exhaust the interior 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 vent pipe and the second vent pipe can blow air into the interior of the device by connecting to an external environment. In the following embodiments, the external device is a vacuum generator. In other possible implementations, the external device can also be other exhaust devices well known to those skilled in the art. The chemical experiment samples in this article are in powder form.

[0074] Example 1

[0075] Figure 1 and Figure 2 The overall structure of the automatic quantitative dispensing device for chemical experiment samples provided in this embodiment is shown, as shown in the figure, including a sample delivery mechanism 1, a sample quantification mechanism 2, a sample conveying mechanism 3 and a sample containing mechanism 4. Among them, the sample delivery mechanism 1 is used to hold the chemical experiment sample (hereinafter referred to as the sample) to be packaged and convey the sample to the sample quantification mechanism 2, the sample quantification mechanism 2 can contain a quantitative sample as required and cooperate with the sample conveying mechanism 3 to convey the sample, the sample conveying mechanism 3 can convey the sample from the sample quantification mechanism 2 to the sample containing mechanism 4, and the sample containing mechanism 4 is used to place the sample container 5 and contain the sample in the sample container 5. In this embodiment, the sample container 5 is a centrifuge tube.

[0076] Next reference Figure 3 and Figure 5 The sample delivery mechanism 1 is composed of a hopper 11 and a conical valve 12. The valve 12 is provided with a valve stem 121 extending downward from its lower surface. The hopper 11 is provided with a valve stem guide hole 112 extending vertically at the discharge port 111. The valve stem 121 is sleeved in the valve stem guide hole 112. The sample quantitative mechanism 2 is provided with a valve adjustment block 23. The valve adjustment block 23 has a guide surface 231. The longitudinal section of the valve adjustment block 23 is a right-angle trapezoid. The valve stem 121 can move up and down under the guidance of the valve adjustment 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, so that it is convenient for the valve 12 to push away the sample above when it rises. The valve 12 is hollow inside, which can prevent the valve 12 from being blocked by the sample flowing under the valve 12 when it descends.

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

[0078] like Figure 5 As shown, a V-shaped scraper 113 is also provided on the hopper 11 . The scraper 113 is made of rubber and can be closely attached to the first turntable 21 of the sample quantification mechanism 2 to gather the sample spilled on the first turntable 21 .

[0079] like Figure 6 and Figure 7 As shown, the sample quantitative mechanism 2 includes a first turntable 21, a valve adjustment block 23 (not shown in the figure, see Figure 3-Figure 5 ), a retractable film 24, a support plate 25 and a support plate driving assembly.

[0080] The first rotating disk 21 is driven by a motor 22. The first rotating disk 21 has a plurality of dynamic quantitative bins equidistantly arranged in the circumferential direction of the edge ring. Figure 1 and Figure 2 As shown, the valve regulating block 23 is arranged outside the dynamic quantitative bin, and the valve regulating block 23 can rotate synchronously with the dynamic quantitative bin to enter the bottom of the hopper 11.

[0081] Back to Figure 6 and Figure 7 The first rotating disk 21 is provided with a plurality of rectangular openings 211 equidistantly in the circumferential direction of the edge ring, one end of the retractable film 24 is fixed around the opening 211, and the other end is fixed on the support plate 25, and the opening 211, the retractable film 24 and the support plate 25 together constitute a dynamic quantitative bin. The retractable film 24 is made of rubber, and has only one opening 211 at the top, and the rest of the parts are an integral whole.

[0082] like Figure 7 Shown and Figure 8 The support plate driving 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 rotating disk 21. The support plate 25 is sleeved on the four guide rods 28. The support plate 25 is also threadedly connected with the lead screw 27, and the lead screw 27 is driven by the motor 26. When the motor 26 rotates, the support plate 25 can be driven to move up and down, and the retractable film 24 can be retracted with the movement of the support plate 25. In this way, the volume of the dynamic quantitative bin can be adjusted, and because the retractable film 24 is an integral body except for the opening 211, the powder will not be stuck in the gap. In addition, a vibrator 29 is installed below the support plate 25, which can vibrate the powder in the dynamic quantitative bin.

[0083] like Fig. 9As shown, the sample delivery mechanism 3 includes a sample delivery chamber 31, two air pipes 32, two pneumatic clamps 33, a sealing chamber 34 and a lifting and adjusting cylinder 35. A bracket 352 is fixedly installed at the end of a push rod 351 of the lifting and adjusting cylinder 35, and the bracket 352 can be driven to move up and down by the extension and contraction of the push rod 351. The sample delivery chamber 31 and the two pneumatic clamps 33 are fixedly installed on the bracket 352 respectively.

[0084] The sample delivery chamber 31 is formed with a downward sample inlet 311 and a sample outlet 312 at its bottom, and the sample inlet 311 and the sample outlet 312 are respectively connected to a throttle pipe 32. The air pipe 32 connected to the sample outlet 312 is provided with a sealing cover plate 321 at the other end, and the air pipe 32 can be sealed and connected to the sample container 5 through the sealing cover plate 321. The air pipe 32 connected to the sample inlet 311 is connected to a sealing chamber 34 at the other end, and the air pipe 32 can be connected to the dynamic quantitative chamber through the sealing chamber 34. The two throttle pipes 32 are respectively movably clamped by a pneumatic clamp 33, and the two pneumatic clamps 33 can clamp the air pipe 32 to block the communication between the sample delivery chamber 31 and the sealing chamber 34 and the sample container 5.

[0085] The sealed chamber 34 is provided with a first ventilation pipe 341 which is inclined upwards and communicates with the outside environment. The outside environment blows air from the sealed chamber 34 to the air pipe 32 through the first ventilation pipe 341. The sample delivery chamber 31 is provided with a second ventilation pipe 313 which is horizontal and communicates with the outside environment. The outside environment blows air from right to left into the sample delivery chamber 31 through the second ventilation pipe 313. Alternatively, the second ventilation pipe 313 exhausts the sample delivery chamber 31 through an external device.

[0086] The right side of the sample delivery chamber 31 is relatively high, and the angle at the bend is relatively small, while the left side of the sample delivery chamber 31 is relatively low, and the angle at the bend is relatively large. This structure allows the sample to be sucked up from the right side and then blown into the left side through the second ventilation pipe 313.

[0087] Furthermore, a sealing ring 342 is disposed below the sealing chamber 34 , and when the sealing chamber 34 is pressed onto the first rotating disk 21 , a better sealing effect can be achieved.

[0088] like Fig.10 As shown, the sample holding mechanism 4 includes a second turntable 41 , a clamp 43 , a photoelectric sensor 44 and a lifting tray 45 .

[0089] The second turntable 41 is driven by a motor 42 , and has a plurality of container insertion holes 411 in the circumferential direction of the edge ring for inserting the sample container 5 . A clamp 43 is installed under each container insertion hole 411 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 placed 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 at the placement position blocks the light signal in the middle of the photoelectric sensor 44, the clamp 43 is always in a loose state. When the sample container 5 moves down and no longer blocks the photoelectric sensor 44, the clamp 43 clamps and fixes 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 taking-out position. When the sample container 5 moves to the taking-out position as the second turntable 41 rotates, the lifting tray 45 rises, drags the sample container 5, and the clamp 43 is released, so that the sample container 5 can be taken out.

[0092] like Figure 11~Figure 13 As 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 far right side under the action of the spring 435, and the clamp 43 is in a loosened state. Fig.13 As shown, when the electromagnet 432 is energized, the iron sheet 433 is adsorbed on the electromagnet 432, the clamping ring 434 is at the far left, the spring 435 is compressed, and the clamp 43 is in a clamped state.

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

[0094] The following is an explanation of the quantitative packaging method for chemical experiment samples provided in this embodiment, which specifically includes the following steps:

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

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

[0097] (2) The relationship between the weight and volume of the required powder sample is calibrated to obtain the corresponding relationship between mass and volume, and the mass of the required chemical experiment sample is converted into the volume of the chemical experiment sample. The motor 26 of each dynamic quantitative chamber is started, the support plate 25 moves downward, and the retractable film 24 is stretched accordingly, so that the volume of the dynamic quantitative chamber is equivalent to the volume of the chemical experiment sample.

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

[0099] (4) The first rotating disk 21 stops for a preset time to ensure that the dynamic quantitative bin is filled with chemical experimental samples. After that, the first rotating disk 21 rotates, and the scraper 113 scrapes the top of the dynamic quantitative bin, smoothing the sample and gathering the excess sample, which will fall into the next dynamic quantitative bin. At the same time, since the valve adjustment block 23 leaves the valve stem 121, the valve stem 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 quantitative chamber filled with samples moves to the bottom of the sealing chamber 34, and then the second turntable 41 rotates so that a sample container 5 is located just below the air pipe 32 connected to the sample outlet 312.

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

[0102] (7) The two pneumatic clamps 33 respectively close the two air pipes 32, and the external vacuum generator exhausts air to the outside through the second ventilation pipe 313, thereby reducing the air pressure in the sample transport chamber 31.

[0103] (8) The pneumatic clamp 33 above the sealing chamber 34 opens, and the air pipe 32 connected to the sealing chamber 34 is ventilated, so that the sealing chamber 34 is connected to the sample delivery chamber 31, and the support plate 25 moves upward to reduce the volume of the dynamic quantitative chamber. At the same time, the first vent pipe 341 and the second vent pipe 313 are respectively connected to the external environment. Since the sample delivery chamber 31 is in a negative pressure state, the external environment blows air in the direction close to the sample inlet 311 through the first vent pipe 341, driving the sample to move upward into the sample delivery chamber 31. At the same time, the external environment blows air in the direction of the sample outlet 312 through the second vent pipe 313 (in this embodiment, the direction is from right to left), driving the sample in the sample delivery chamber 31 to move leftward in the sample delivery chamber 31. In this process, the vibrator 29 on the dynamic quantitative chamber generates high-frequency vibration, which enables the sample to move more violently, ensuring that the sample can completely leave the dynamic quantitative chamber and be transported to the sample delivery chamber 31.

[0104] (9) The pneumatic clamp 33 above the sample container 5 opens, 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 quantitative chamber are transported to the sample container 5.

[0106] (11) Take out sample container 5

[0107] The second turntable 41 rotates, and the sample container 5 containing the sample moves to the removal position. The lifting tray 45 rises according to the length of the sample container 5 to hold the sample container 5. At this time, the clamp 43 is automatically released, and the sample container 5 is taken away manually or by a robotic arm.

[0108] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of 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. The sample conveying mechanism can connect the retractable film and the sample container.

2. The automatic quantitative packaging device for chemical experiment samples according to claim 1, characterized in that: 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.

3. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 2, 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.

4. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 3, 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.

5. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 3, 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.

6. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 3, 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.

7. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 3, 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.

8. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 4, 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.

9. The automatic quantitative packaging device for chemical experiment samples as claimed in claim 3, 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.

10. 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 9 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) The mass of the required chemical experiment sample is converted 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 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 close the two air pipes, and the external equipment exhausts air to the outside through the second ventilation pipe; (6) The air pipe connected to the sealing 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 air tube 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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