Multi-channel grain sample weighing and liquid adding device

Abstract

The utility model relates to the technical field of grain detection, provide a kind of multi-channel grain sample weighing liquid adding device, comprising: mounting bracket, and multiple liquid adding components are arranged in parallel on mounting bracket;Each liquid adding component includes: drive mechanism, cylinder and piston rod;Drive mechanism is fixedly installed in the rear side of mounting bracket;Cylinder is fixedly installed in the front side of mounting bracket, and accommodating cavity is equipped in cylinder, and cylinder is equipped with fluid through-hole;Piston rod is axially movably threaded in cylinder, one end of piston rod is connected with the power output end of drive mechanism, the other end of piston rod extends into accommodating cavity and separates accommodating cavity into liquid chamber and drive chamber, and liquid chamber is communicated with fluid through-hole.The multi-channel grain sample weighing liquid adding device provided in the embodiment can simultaneously perform liquid adding operation on multiple grain sample containers.The mode of sequential operation of traditional single-channel equipment is changed, the efficiency of sample pretreatment is improved, and it is particularly suitable for high-throughput detection scenarios that require processing a large number of samples.

Description

Technical Field

[0001] This utility model relates to the field of grain testing technology, and in particular to a multi-channel grain sample weighing and liquid adding device. Background Technology

[0002] In grain inspection and testing laboratories, meticulous sample pretreatment is required before conducting chemical composition analysis (such as mycotoxin, pesticide residue, and fatty acid value determination) on grain samples (e.g., wheat, corn, rice). One step involves accurately weighing a certain mass of sample powder and adding a specific volume of extraction solvent for extraction. Currently, this process mainly relies on manual operation or semi-automated equipment.

[0003] Manual operation typically involves laboratory personnel using tools such as balances, spatulas, and pipettes to weigh and add liquids one by one. This method suffers from problems such as low efficiency, high labor intensity, susceptibility to human error, and potential health hazards (such as exposure to organic solvents), making it difficult to meet the needs of large-scale, high-throughput sample testing. Utility Model Content

[0004] This invention provides a multi-channel grain sample weighing and liquid adding device to solve the problems of low liquid adding efficiency, high labor intensity, and easy introduction of human operation error in existing devices.

[0005] This utility model provides a multi-channel grain sample weighing and liquid adding device, comprising: Mounting frame, and multiple liquid dispensing assemblies arranged side by side on the mounting frame; Each of the liquid dispensing components includes: a drive mechanism, a cylinder, and a piston rod; The drive mechanism is fixedly installed on the rear side of the mounting frame; the cylinder is fixedly installed on the front side of the mounting frame, the cylinder has a receiving cavity and a fluid passage hole. The piston rod is axially movable and passes through the cylinder. One end of the piston rod is connected to the power output end of the drive mechanism, and the other end of the piston rod extends into the receiving cavity and divides the receiving cavity into a liquid cavity and a drive cavity. The liquid cavity is connected to the fluid through hole so that the piston rod can be driven to move through the drive mechanism to realize the extraction and distribution of liquid.

[0006] According to the present invention, a multi-channel grain sample weighing and liquid dispensing device is provided, wherein the driving mechanism includes: a driving component, a slider, a lead screw, and a lead screw nut; the liquid dispensing assembly also includes a mounting plate. The output shaft of the drive unit is connected to the lead screw and is used to drive the lead screw to rotate around its axis. The lead screw nut is sleeved on the lead screw and forms a threaded engagement with the lead screw; The slider is fixedly connected to the lead screw nut and is slidably mounted on the mounting plate; the mounting plate is disposed between the drive mechanism and the cylinder. The piston rod is connected to the slider so that the rotational motion of the lead screw is converted into the linear motion of the slider through the lead screw nut, thereby driving the piston rod to move axially.

[0007] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the mounting plate is provided with a guide rail extending in a vertical direction, and the slider is slidably disposed on the guide rail.

[0008] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the mounting plate is provided with a hollow, a part of the slider is slidably mounted on the guide rail, and another part of the slider passes through the hollow and is connected to the piston rod.

[0009] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the driving mechanism further includes: a base connected to the mounting plate, the driving component disposed on the base, the lead screw rotatably mounted on the base, a limiting groove extending vertically on the side of the base opposite to the guide rail, and a limiting member on the lead screw nut extending into the limiting groove.

[0010] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the driving component is one of a stepper motor, a servo motor or a DC motor.

[0011] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the cylinder is made of transparent or semi-transparent material; and the fluid passage is provided at the top of the cylinder.

[0012] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein a piston head is provided at one end of the piston rod that extends into the receiving cavity, and a sealing ring is fitted on the piston head so that the piston head and the inner wall of the receiving cavity form a seal.

[0013] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the mounting plate is provided with a first pressure plate and a second pressure plate for fixing the cylinder, the first pressure plate and the second pressure plate are connected to the mounting plate at intervals, and the cylinder is disposed between the first pressure plate and the second pressure plate.

[0014] According to the present invention, a multi-channel grain sample weighing and liquid adding device is provided, wherein the cylinder is a container with a capacity of 50ml to 200ml.

[0015] The multi-channel grain sample weighing and dispensing device provided in this embodiment arranges multiple dispensing components side-by-side on the same mounting plate. The drive mechanism of each channel can be activated independently and synchronously, driving its respective piston rod to move axially. This allows the parallel dispensing of liquid to multiple sample containers to be completed in one operation, enabling simultaneous dispensing of liquid to multiple grain sample containers (such as centrifuge tubes). This completely changes the sequential operation mode of traditional single-channel equipment, greatly improving the efficiency of sample pretreatment, and is particularly suitable for high-throughput detection scenarios requiring the processing of large numbers of samples. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the multi-channel grain sample weighing and liquid adding device provided by this utility model.

[0018] Figure 2 This is a side view of the multi-channel grain sample weighing and liquid adding device provided by this utility model after removing the mounting frame.

[0019] Figure 3 This is a three-dimensional structural diagram of the multi-channel grain sample weighing and liquid adding device provided by this utility model after removing the mounting frame.

[0020] Figure 4 This is a cross-sectional schematic diagram of the location of the liquid addition component in the multi-channel grain sample weighing and liquid addition device provided by this utility model.

[0021] Figure label: 1. Mounting bracket; 2. Liquid filling assembly; 21. Drive mechanism; 211. Drive component; 212. Slider; 213. Lead screw; 214. Lead screw nut; 215. Base; 216. Limiting groove; 217. Limiting component; 22. Cylinder; 23. Piston rod; 24. Mounting plate; 241. Guide rail; 242. Hollowed-out; 25. Piston head; 26. First pressure plate; 27. Second pressure plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] The following is combined Figures 1-4 This invention describes a multi-channel grain sample weighing and liquid dispensing device.

[0024] In some embodiments, such as Figures 1 to 4 As shown, the multi-channel grain sample weighing and dispensing device includes: a mounting frame 1 and multiple dispensing components 2 arranged side by side on the mounting frame 1. Each dispensing component 2 includes: a drive mechanism 21, a cylinder 22, and a piston rod 23; the drive mechanism 21 is fixedly installed on the rear side of the mounting frame 1; the cylinder 22 is fixedly installed on the front side of the mounting frame 1, and the cylinder 22 has a receiving cavity and a fluid passage; the piston rod 23 is axially movable and passes through the cylinder 22, one end of the piston rod 23 is connected to the power output end of the drive mechanism 21, and the other end of the piston rod 23 extends into the receiving cavity and divides the receiving cavity into a liquid cavity and a drive cavity. The liquid cavity communicates with the fluid passage so that the piston rod 23 can be moved by the drive mechanism 21 to realize the extraction and dispensing of liquid.

[0025] In this embodiment, the mounting frame 1 has an internal mounting cavity, the cylinder 22 of the liquid addition assembly 2 is located on the outside of the mounting frame 1, and the drive mechanism 21 is located inside the mounting cavity. Multiple liquid addition assemblies 2 are arranged side by side on the mounting frame 1 at the same spacing, enabling parallel processing. This allows the device to simultaneously add liquid to multiple grain samples, significantly improving efficiency.

[0026] When the drive mechanism 21 pushes the piston rod 23 to move axially, the volume of the liquid chamber is changed. When the piston rod 23 moves forward, it precisely discharges the liquid in the liquid chamber through the fluid passage, achieving the liquid addition function; when the piston rod 23 retracts backward, it draws external liquid into the liquid chamber through the fluid passage, completing the liquid suction process. By independently controlling the drive mechanism 21 of each liquid addition component 2, synchronous or asynchronous precise liquid addition across multiple channels can be achieved.

[0027] The multi-channel grain sample weighing and liquid adding device provided in this embodiment arranges multiple liquid adding components 2 side by side on the same mounting plate 24. The drive mechanism 21 of each channel can be started independently and synchronously, driving its respective piston rod 23 to move axially. This allows the parallel liquid adding process to multiple sample containers to be completed at once, enabling simultaneous liquid adding to multiple grain sample containers (such as centrifuge tubes). This completely changes the sequential operation mode of traditional single-channel equipment, greatly improving the efficiency of sample pretreatment, and is particularly suitable for high-throughput detection scenarios that require processing a large number of samples.

[0028] In some embodiments, such as Figures 1 to 4 As shown, the drive mechanism 21 includes: a drive component 211, a slider 212, a lead screw 213, and a lead screw nut 214. The liquid addition assembly 2 also includes a mounting plate 24; the output shaft of the drive component 211 is connected to the lead screw 213 to drive the lead screw 213 to rotate around its axis; the lead screw nut 214 is sleeved on the lead screw 213 and forms a threaded engagement with the lead screw 213; the slider 212 is fixedly connected to the lead screw nut 214 to form an integral motion unit. Simultaneously, the slider 212 is slidably engaged with the mounting plate 24, so that under the constraint of the slider 212, it can only move linearly in a direction parallel to the axis of the lead screw 213, and cannot rotate with the lead screw nut 214. The mounting plate 24 is disposed between the drive mechanism 21 and the cylinder 22; the piston rod 23 is connected to the slider 212 so that the rotational motion of the lead screw 213 is converted into the linear motion of the slider 212 through the lead screw nut 214, thereby driving the piston rod 23 to move axially.

[0029] When liquid needs to be added, the drive unit 211 controls the lead screw 213 to rotate, pushing the slider 212 and piston rod 23 forward to apply stable pressure to the liquid inside the cylinder, achieving precise liquid discharge. When liquid needs to be aspirated, the drive unit 211 reverses, driving the slider 212 and piston rod 23 backward to create negative pressure inside the cylinder, completing the quantitative extraction of liquid. This lead screw-driven drive method has the advantages of high transmission efficiency, precise positioning, and stable operation, effectively ensuring the accuracy and repeatability of liquid addition operations in grain sample testing.

[0030] In some embodiments, such as Figures 1 to 4 As shown, the mounting plate 24 is provided with a guide rail 241 extending in the vertical direction. The guide rail 241 is fastened with screws or integrally machined with the mounting plate 24, ensuring the rigidity and stability of the connection. The inner side of the slider 212 is provided with a groove or slider 212 hole that matches the shape of the guide rail 241, so that it can be slidably fitted on the guide rail 241.

[0031] This guide rail 241 and slider 212 pair constitute a linear motion guiding mechanism. Its specific function is that when the lead screw 213 rotates under the drive of the drive member 211, the slider 212, which is fixedly connected to the lead screw nut 214, cannot rotate with the lead screw nut 214 due to the linear constraint of the guide rail 241. Instead, it is forcibly guided to perform precise and wobbly linear motion in the vertical direction of the guide rail 241.

[0032] This guiding mechanism strictly limits the movement trajectory of the slider 212 and its connected piston rod 23, ensuring that the piston rod 23 moves in a purely axial linear motion within the receiving cavity of the cylinder 22. This effectively prevents wear on the piston seal and the inner wall of the cylinder 22 caused by lateral forces or deflection, thus ensuring the long-term reliability of the seal and extending its service life. Secondly, the high-rigidity guide support can withstand the radial load generated during the liquid addition process, eliminating gaps and vibrations in moving parts and providing stability for the precise extraction and distribution of micro-liquids. Moreover, this guiding method allows the thrust generated by the drive mechanism 21 to be transmitted to the piston rod 23 along an accurate axis, improving transmission efficiency and position control accuracy.

[0033] Furthermore, the mounting plate 24 has a perforation 242. The main body of the slider 212, i.e., the part connected to the lead screw nut 214, is located on the rear side of the mounting plate 24 and is slidably mounted on the guide rail 241, which guides its movement trajectory. Simultaneously, the slider 212 extends forward to form a connecting part (e.g., a connecting arm or protrusion), which passes precisely through the perforation 242 on the mounting plate 24 and extends to the front side of the mounting plate 24. The connecting part on the front side of the slider 212 is reliably connected to the rear end of the piston rod 23 via a threaded connection, set screw, or quick-release clamp.

[0034] The slider 212 acts as a power transmission intermediary between the drive mechanism 21 (rear side) and the actuating components (piston rod 23 and cylinder 22 on the front side), directly transmitting the linear motion of the lead screw nut 214 to the piston rod 23 through the perforation 242. The perforation 242 on the mounting plate 24 provides a viewing window for observing the connection status between the slider 212 and the piston rod 23. During installation or maintenance, operators can directly access the connection point through the perforation 242 to install, remove, or inspect the piston rod 23 without having to disassemble it from the complex mechanical structure, greatly improving maintainability. The reasonable perforation 242 design effectively reduces the weight of the device while ensuring the overall structural strength of the mounting plate 24.

[0035] In some embodiments, such as Figures 1 to 4 As shown, the drive mechanism 21 also includes a base 215. The base 215 is connected to the mounting plate 24, the drive component 211 is disposed on the base 215, and the lead screw 213 is rotatably mounted on the base 215.

[0036] In this embodiment, to further constrain the degrees of freedom of the moving parts and ensure precise transmission, a limiting groove 216 extending vertically is provided on the side of the base 215 opposite to the guide rail 241 on the mounting plate 24. Correspondingly, a limiting member 217 (e.g., a limiting pin or a raised key) is fixedly provided on the lead screw nut 214. One end of the limiting member 217 is embedded in or passes through the lead screw nut 214, and the other end extends precisely into the limiting groove 216 of the base 215.

[0037] When the drive component 211 drives the lead screw 213 to rotate, the lead screw nut 214, which meshes with the lead screw 213, is constrained by the limiting component 217. The limiting component 217 is restricted to sliding within the limiting groove 216 of the base 215 and cannot rotate, thus forcing the rotational motion of the lead screw 213 into linear motion. The cooperation between the limiting groove 216 and the limiting component 217, together with the guide rail 241 on the mounting plate 24, forms a double constraint on the movement trajectory of the slider 212 (connected to the lead screw nut 214), significantly improving the reliability of the equipment under long-term frequent operation.

[0038] Optionally, the drive unit 211 is one of a stepper motor, a servo motor, or a DC motor.

[0039] For example, in scenarios requiring high-precision stepping positioning, open-loop control, and high cost control, the drive component 211 can preferably be a stepper motor. A stepper motor can accurately convert electrical pulse signals into angular displacement, achieving precise positioning control without encoder feedback, making it suitable for performing constant-volume liquid addition operations.

[0040] In applications requiring higher precision, faster response speeds, complex motion curves (such as acceleration / deceleration control), and strict closed-loop feedback control of torque and position, the drive unit 211 can be selected as a servo motor. A servo motor, through its built-in position or speed sensor, forms a closed-loop control system, enabling extremely smooth motion and higher dynamic response characteristics, making it suitable for applications requiring ultra-precise control of the liquid addition process.

[0041] In addition, in situations where control precision requirements are relatively relaxed but economy is more important, such as when adding liquid in large volumes at a fixed flow rate, the drive unit 211 can also be a DC motor, and the speed can be adjusted through a matching gearbox to meet the power transmission requirements.

[0042] In some embodiments, such as Figures 1 to 4 As shown, a piston head 25 is provided at one end of the piston rod 23 that extends into the receiving cavity. A sealing ring is fitted on the piston head 25 so that the piston head 25 forms a seal with the inner wall of the receiving cavity.

[0043] The piston head 25 has at least one annular sealing groove, and the sealing ring is fitted inside the sealing groove. When the piston rod 23 is assembled into the cylinder 22, the sealing ring undergoes slight deformation under the elasticity of the material, and its outer edge maintains tight and continuous contact with the inner wall of the receiving cavity, thereby forming a reliable dynamic seal between the piston head 25 and the inner wall of the receiving cavity.

[0044] This sealing structure ensures that the piston head 25 divides the receiving cavity into a non-communicating liquid cavity and a drive cavity. When the drive mechanism 21 pushes the piston rod 23 to move axially, the liquid cavity can form a closed space under the effective sealing of the sealing ring. Its volume changes precisely with the movement of the piston rod 23, thereby realizing the quantitative extraction and distribution of liquid, while effectively preventing liquid from seeping into the drive cavity or the external environment, ensuring the accuracy of the liquid addition process.

[0045] In some embodiments, such as Figures 1 to 4 As shown, the mounting plate 24 is provided with a first pressure plate 26 and a second pressure plate 27 for fixing the cylinder 22. The first pressure plate 26 and the second pressure plate 27 are connected to the mounting plate 24 at intervals, and the cylinder 22 is disposed between the first pressure plate 26 and the second pressure plate 27.

[0046] In this embodiment, the first pressure plate 26 and the second pressure plate 27 are connected to the front side of the mounting plate 24 at a certain distance by bolts or screws. They are parallel to each other and form a clamping space between them for accommodating and constraining the cylinder 22. The body of the cylinder 22 (usually a syringe-type glass or plastic cylinder) is placed in this clamping space, and its end is provided with a fluid passage for connecting a pipeline or suction head.

[0047] In some embodiments, the cylinder 22 is made of a transparent or translucent material, such as borosilicate glass, polypropylene, or polycarbonate. This material characteristic allows operators to directly and clearly observe the volume, color, and presence of bubbles and other key states of the liquid inside the cylinder 22, facilitating real-time monitoring of the liquid addition process, timely detection of abnormalities, and liquid level calibration, thereby effectively ensuring the intuitiveness of the operation and the reliability of the process.

[0048] The capacity of cylinder 22 needs to balance the throughput and accuracy requirements of routine grain testing experiments, and its nominal capacity is usually between 50 ml and 200 ml. The smaller capacity of 50 ml is suitable for adding reagents or extracts in precise amounts but relatively small volumes, which helps to reduce reagent waste; while the larger capacity of 200 ml can meet the application scenarios of large-volume sample processing or applications that require the addition of large amounts of solvent, improving the continuous operation capability after a single filling.

[0049] Preferably, the capacity of the cylinder 22 is 100 ml. This specification achieves the best balance between capacity applicability and ease of operation: on the one hand, the 100 ml capacity can cover the liquid volume requirements of most grain testing items (such as fatty acid value determination, mycotoxin extraction, etc.), avoiding frequent refilling; on the other hand, compared with a larger capacity cylinder 22, its size is more moderate, which helps to control the volume of the entire liquid dispensing device.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-channel grain sample weighing and dispensing device, characterized in that, include: Mounting frame, and multiple liquid dispensing assemblies arranged side by side on the mounting frame; Each of the liquid dispensing components includes: a drive mechanism, a cylinder, and a piston rod; The drive mechanism is fixedly installed on the rear side of the mounting frame; the cylinder is fixedly installed on the front side of the mounting frame, the cylinder has a receiving cavity and a fluid passage hole. The piston rod is axially movable and passes through the cylinder. One end of the piston rod is connected to the power output end of the drive mechanism, and the other end of the piston rod extends into the receiving cavity and divides the receiving cavity into a liquid cavity and a drive cavity. The liquid cavity is connected to the fluid through hole so that the piston rod can be driven to move through the drive mechanism to realize the extraction and distribution of liquid.

2. The multi-channel grain sample weighing and dispensing device according to claim 1, characterized in that, The driving mechanism includes: a driving component, a slider, a lead screw, and a lead screw nut; the liquid addition assembly also includes a mounting plate; The output shaft of the drive unit is connected to the lead screw and is used to drive the lead screw to rotate around its axis. The lead screw nut is sleeved on the lead screw and forms a threaded engagement with the lead screw; The slider is fixedly connected to the lead screw nut and is slidably mounted on the mounting plate; the mounting plate is disposed between the drive mechanism and the cylinder. The piston rod is connected to the slider so that the rotational motion of the lead screw is converted into the linear motion of the slider through the lead screw nut, thereby driving the piston rod to move axially.

3. The multi-channel grain sample weighing and dispensing device according to claim 2, characterized in that, The mounting plate is provided with a guide rail extending in a vertical direction, and the slider is slidably mounted on the guide rail.

4. The multi-channel grain sample weighing and dispensing device according to claim 3, characterized in that, The mounting plate has a cutout, a portion of the slider is slidably mounted on the guide rail, and another portion of the slider passes through the cutout and is connected to the piston rod.

5. The multi-channel grain sample weighing and dispensing device according to claim 3, characterized in that, The driving mechanism further includes: a base connected to the mounting plate, the driving component disposed on the base, the lead screw rotatably mounted on the base, a limiting groove extending vertically on the side of the base opposite to the guide rail, and a limiting member on the lead screw nut extending into the limiting groove.

6. The multi-channel grain sample weighing and dispensing device according to claim 2, characterized in that, The driving component is one of a stepper motor, a servo motor, or a DC motor.

7. The multi-channel grain sample weighing and dispensing device according to claim 1, characterized in that, The cylinder is made of a transparent or translucent material; the fluid passage is located at the top of the cylinder.

8. The multi-channel grain sample weighing and dispensing device according to claim 7, characterized in that, A piston head is provided at one end of the piston rod that extends into the receiving cavity, and a sealing ring is fitted on the piston head to form a seal with the inner wall of the receiving cavity.

9. The multi-channel grain sample weighing and dispensing device according to claim 2, characterized in that, The mounting plate is provided with a first pressure plate and a second pressure plate for fixing the cylinder. The first pressure plate and the second pressure plate are connected to the mounting plate at intervals, and the cylinder is disposed between the first pressure plate and the second pressure plate.

10. The multi-channel grain sample weighing and dispensing device according to any one of claims 1-9, characterized in that, The cylinder is a container with a capacity of 50ml to 200ml.

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