A grain heavy metal content detection device
By adopting an adjustable tilting tube design and locking structure in the grain heavy metal content detection device, the problem of test tube breakage during high-speed rotation is solved, and effective mixing and protection of the liquid surface inside the test tube are achieved, thus improving detection efficiency and flexibility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 包头市粮食质量检测中心
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-24
AI Technical Summary
In existing technologies, test tubes in grain heavy metal content detection devices are prone to breakage due to concentrated force when rotating at high speed, and the vertical placement method makes it difficult to achieve effective shaking and mixing.
The test tube is designed with an adjustable tilt. The test tube is supported by a support between the upper and lower support plates. The periodic undulation and tumbling of the liquid surface inside the test tube during rotation creates eddies and shear forces. Combined with a locking structure, the tilt angle can be adjusted to protect the test tube and improve mixing efficiency.
It effectively protects test tubes from stress concentration, improves the mixing effect of samples and reagents, is easy to operate and adaptable to different sample parameters, and enhances the flexibility and adaptability of the device.
Smart Images
Figure CN224553121U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of grain testing technology, and in particular to a device for detecting the heavy metal content of grain. Background Technology
[0002] When testing rice for heavy metal content, the rice sample needs to be placed inside a test tube, mixed with the test reagent by shaking, centrifuged, and then the resulting sample solution is tested.
[0003] A prior art disclosure reveals a rice heavy metal content detector (publication number: CN219978264U), comprising a base, a guide frame, a rotating ring, a support frame, a drive assembly, a motor, a rotating shaft, a convex shaft, a sliding outer ring, spring connectors, a rotating inner ring, test tube racks, and a detection mechanism. The guide frame is connected to the top of the base, and the rotating ring is rotatably connected to the guide frame. The support frame is connected to the top of the guide frame, and the drive assembly is connected to the upper middle part of the support frame. The motor is connected to the upper middle part of the base, and the rotating shaft is connected to the output shaft of the motor. The rotating shaft is connected to the rotating ring, and the convex shaft is connected to the top of the rotating shaft. The sliding outer ring is slidably connected to the upper part of the guide frame, and multiple spring connectors are connected to the sliding outer ring. Rotating inner rings are rotatably connected between the spring connectors. The convex shaft and the rotating inner ring are press-fitted together. The drive assembly is threadedly connected to the rotating inner ring, and multiple test tube racks are rotatably connected to the rotating inner ring. The support frame is equipped with a detection mechanism for detecting the solvent inside the test tubes.
[0004] In the existing technology, the rack for placing test tubes is vertical and placed in the insertion clamp. When rotating at high speed, only the parts of the test tube are subjected to force. The centrifugal force generated by high-speed rotation can easily damage the test tube. Secondly, with the vertical placement method, the sample is difficult to roll inside the test tube, and the oscillation from multiple dimensions will increase the complexity of the structure. Furthermore, balance is a problem that needs to be overcome.
[0005] Therefore, we propose a device for detecting heavy metal content in grains. Utility Model Content
[0006] The present invention mainly addresses the technical problem that test tubes are prone to breakage due to concentrated stress under high-speed rotation, and provides a device for detecting heavy metal content in grains.
[0007] To achieve the above objectives, this utility model adopts the following technical solution: a grain heavy metal content detection device, comprising: The main body has a detection mechanism fixedly installed on its top. The top of the main body is provided with a shaking assembly for centrifuging the sample. The shaking assembly includes an upper support plate, a lower support plate, a placement tube, and a support body. The lower support plate is rotatably connected to the main body. The bottom of the main body is provided with a motor-driven lower support plate. A rotatable upper support plate is provided above the lower support plate. Both the lower and upper support plates are provided with a support body. The two ends of the placement tube are respectively limited by the support bodies on the upper and lower support plates. The tilt angle of the placement tube can be adjusted by rotating the upper support plate. The sample can be placed tilted in the placement tube for centrifugation. A locking structure is provided between the upper and lower support plates to lock the position of the upper support plate.
[0008] In a preferred embodiment of this utility model, the upper support plate and the lower support plate are circular plates with equal diameters, the motor is fixedly installed with the main body, and the output shaft of the motor is connected to the lower support plate through a coupling.
[0009] In a preferred embodiment of this utility model, the support body is a deformable rubber ring, the placement tube passes through the central hole of the support body, and the upper and lower ends of the support body are provided with annular flanges, which are integrally formed with the support body. The upper and lower support plates are provided with circular holes for installing the support body, and the support body is interference-fitted with the circular holes.
[0010] In a preferred embodiment of this utility model, the end of the support body is provided with a plurality of deformation grooves, the deformation grooves being fan-shaped grooves.
[0011] In a preferred embodiment of this utility model, the locking structure includes a vertical shaft, positioning holes, a thrust ring, a butterfly washer, and a screw. The vertical shaft is fixedly connected to the lower support plate, and the upper support plate is rotatably connected to the vertical shaft. Several positioning holes are provided on the top of the upper support plate, and the thrust ring can be engaged with the positioning holes. A threaded hole is provided at the upper end of the vertical shaft, and the screw is threadedly connected to the vertical shaft. The butterfly washer is disposed between the thrust ring and the screw.
[0012] In a preferred embodiment of this utility model, the vertical shaft is fixed to the center of the top of the lower support plate by full welding, and a bushing is fixedly installed on the upper support plate, with the vertical shaft rotatably connected to the bushing.
[0013] In a preferred embodiment of this utility model, the thrust ring is annular, and a protrusion is fixedly provided at the bottom of the thrust ring. The protrusion is in clearance fit with the positioning hole, and a number of positioning holes are arranged in a circular array at the upper end of the upper support plate.
[0014] This invention provides a device for detecting heavy metal content in grains. It has the following beneficial effects: 1. This grain heavy metal content detection device uses several adjustable-angle placement tubes between an upper and lower support plate. By placing a test tube containing a sample into the placement tube, the tilting of the upper and lower support plates during their rotation causes the liquid surface inside the test tube to periodically undulate and tumble, forming strong eddies and shear forces. This efficiently mixes the sample and reagents. Centrifugal force presses the test tube against the tube wall, but because it is supported by an inclined plane, the force is decomposed and evenly distributed across the entire side wall of the test tube, avoiding stress concentration at the sharp corners of the test tube bottom, thus protecting the test tube.
[0015] 2. This grain heavy metal content detection device, through the rotation of the upper support plate, changes the inclination angle of the placement tube. As the inclination angle changes, the placement tube compresses the support body. The support body, with its deformation groove, supports the placement tube, ensuring effective support without interfering with the inclination angle change. To adjust the upper support plate, a wrench is used to loosen the screw, remove the screw and wing washer, and then push up the thrust ring. The thrust ring separates from the positioning hole. After rotating the upper support plate, the wing washer and screw are reinstalled. The thrust ring engages with the positioning hole to achieve circumferential locking of the upper support plate. The inclination angle of the placement tube can be adjusted according to sample parameters, such as sedimentation rate and viscosity, providing better flexibility and adaptability, and is simple and quick to operate. Attached Figure Description
[0016] Figure 1 This is a perspective view of the entire utility model; Figure 2 This is one of the three-dimensional views of the shaking component of this utility model; Figure 3 This is the second perspective view of the shaking component of this utility model; Figure 4 This is a perspective view of the support body of this utility model; Figure 5 This is a partial cross-sectional view of the locking structure of this utility model.
[0017] Legend: 10. Main body; 20. Upper support plate; 21. Lower support plate; 22. Placement tube; 23. Support body; 24. Deformation groove; 30. Vertical shaft; 31. Positioning hole; 32. Thrust ring; 33. Butterfly washer; 34. Screw. Detailed Implementation
[0018] A device for detecting heavy metal content in grains, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it includes: The main body 10 has a detection mechanism fixedly mounted on its top. The top of the main body 10 is equipped with a shaking assembly for centrifuging the sample. The shaking assembly includes an upper support plate 20, a lower support plate 21, a placement tube 22, and a support body 23. The lower support plate 21 is rotatably connected to the main body 10. A motor-driven lower support plate 21 is located at the bottom of the main body 10. A rotatable upper support plate 20 is located above the lower support plate 21. Support bodies 23 are located on the tops of both the lower and upper support plates 21 and 20. The two ends of the placement tube 22 are limited by the supports 23 on the upper and lower support plates 20 and 21, respectively. Rotation of the upper support plate 20 can adjust the tilt angle of the placement tube 22, allowing the sample to be placed at an angle. The centrifuge is placed inside the tube 22. The upper support plate 20 and the lower support plate 21 are circular plates with the same diameter. The motor is fixedly installed with the main body 10. The output shaft of the motor is connected to the lower support plate 21 through a coupling. The support body 23 is a deformable rubber ring. The tube 22 is placed through the central hole of the support body 23. The upper and lower ends of the support body 23 are provided with annular flanges. The flanges are integrally formed with the support body 23. The upper support plate 20 and the lower support plate 21 are provided with circular holes for installing the support body 23. The support body 23 is interference-fitted with the circular holes. The end of the support body 23 is provided with several deformation grooves 24. The deformation grooves 24 are fan-shaped grooves. The motor speed range is steplessly adjustable from 500 to 2500 rpm, corresponding to a centrifugal force of 100 to 2000 × g. The upper support plate 20 and the lower support plate 21 are both reserved with counterweight installation holes (not shown in the figure) for adding counterweights to achieve dynamic balance correction. In this design, several tilt-adjustable placement tubes 22 are set between the upper support plate 20 and the lower support plate 21. When the test tube containing the sample is placed into the placement tube 22, the tilt causes the liquid surface in the test tube to periodically rise and roll during the rotation of the upper support plate 20 and the lower support plate 21, forming strong eddies and shear forces, thereby efficiently mixing the sample and reagents. The centrifugal force presses the test tube against the tube wall, but because it is supported by an inclined plane, the force is decomposed and evenly distributed to the entire side wall of the test tube, avoiding stress concentration at the sharp corners at the bottom of the test tube, thus protecting the test tube.
[0019] like Figure 5 As shown, a locking structure is provided between the upper support plate 20 and the lower support plate 21 to lock the position of the upper support plate 20; The locking structure includes a vertical shaft 30, positioning holes 31, a thrust ring 32, a butterfly washer 33, and a screw 34. The vertical shaft 30 is fixedly connected to the lower support plate 21, and the upper support plate 20 is rotatably connected to the vertical shaft 30. Several positioning holes 31 are provided on the top of the upper support plate 20, allowing the thrust ring 32 to engage with the positioning holes 31. A threaded hole is provided at the upper end of the vertical shaft 30, and the screw 34 is threadedly connected to the vertical shaft 30. The butterfly washer 33 is disposed between the thrust ring 32 and the screw 34. The upper support plate 20 is fixed to the top center position of the lower support plate 21 by full welding. The upper support plate 20 is fixedly installed with a bushing. The vertical shaft 30 is rotatably connected to the bushing. The thrust ring 32 is annular. The bottom of the thrust ring 32 is fixedly provided with a protrusion. The protrusion is clearance-fitted with the positioning hole 31. The upper end of the upper support plate 20 is provided with a number of positioning holes 31 in an annular array. Of course, the vertical shaft 30 is also fixedly installed with a washer. The washer is located below the bushing. The washer supports and limits the bushing to prevent the upper support plate 20 from falling. In this design, the tilt angle of the placement tube 22 is adjustable from 90 degrees to 45 degrees, mainly achieved by rotating the upper support plate 20. This rotation changes the tilt angle of the placement tube 22. Since the tilt angle of the placement tube 22 changes, it will compress the support body 23. The support body 23, with its deformation groove 24, supports the placement tube 22, ensuring effective support without interfering with the tilt angle change. When adjusting the upper support plate 20, a wrench is used to loosen the screw 34. After removing the screw 34 and the wing washer 33, the thrust ring 32 is pushed upwards. The thrust ring 32 separates from the positioning hole 31. After rotating the upper support plate 20, the butterfly gasket 33 and screw 34 are reinstalled. The upper support plate 20 is circumferentially locked by the engagement of the thrust ring 32 and the positioning hole 31. The tilt angle of the placement tube 22 can be adjusted according to the parameters of the sample, such as sedimentation rate and viscosity, providing better flexibility and adaptability. The operation is simple and quick. For high-viscosity samples (such as rice paste), the tilt angle is 45°-60° to enhance liquid tumbling; for easily sedimenting particle samples, the tilt angle is recommended to enhance centrifugal separation. After adjusting the tilt angle, the stress area on the side wall of the test tube increases by more than 50%, and the stress concentration at the bottom is reduced by 70%. The deformation groove 24 has a depth of 2 / 3 of the wall thickness of the support body 23 and a width of 1 / 12 of the circumference of the support body. A total of 6 fan-shaped grooves are evenly distributed circumferentially. The groove depth to width ratio is controlled at 1.5:1 to ensure that the support body can elastically deform without failing when tilted for adjustment.
[0020] The working principle of this utility model is as follows: Loosen the screw 34 with a wrench, remove the screw 34 and the butterfly gasket 33, push the thrust ring 32 upward, and the thrust ring 32 separates from the positioning hole 31. After rotating the upper support plate 20, the butterfly gasket 33 and the screw 34 can be reinstalled. The support body 23 with the deformation groove 24 supports the placement tube 22, which can not only ensure the support effect of the placement tube 22, but also not interfere with the change of the tilt angle of the placement tube 22. When the test tube containing the sample is placed into the placement tube 22, when the upper support plate 20 and the lower support plate 21 rotate in a circle, the tilt causes the liquid surface in the test tube to rise and fall periodically and roll during the rotation, forming a strong eddy and shear force, thereby efficiently mixing the sample and reagent. The testing device includes a display screen and a detection head. The display screen integrates chips and algorithms. The detection head is inserted into the test tube to contact the solvent. The detection head is inserted 5mm below the liquid surface in the test tube to perform photoelectric detection (the detection principle is colorimetric or spectroscopic). If the detected value exceeds the standard, an automatic alarm is triggered. The detection data is displayed on the display screen to detect the heavy metal content. Since this is a well-known existing technology, it will not be described in detail here.
[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A device for detecting heavy metal content in grains, characterized in that, include: The main body (10) has a detection mechanism fixedly installed on its top. The top of the main body (10) is provided with a shaking assembly for centrifuging the sample. The shaking assembly includes an upper support plate (20), a lower support plate (21), a placement tube (22), and a support body (23). The lower support plate (21) is rotatably connected to the main body (10). The bottom of the main body (10) is provided with a motor-driven lower support plate (21). The upper support plate (20) is rotatable above the lower support plate (21). The lower support plate (21) and the upper support plate (20) are both provided with a support body (23). The two ends of the placement tube (22) are respectively limited by the support body (23) on the upper support plate (20) and the lower support plate (21). The upper support plate (20) can be rotated to adjust the tilt angle of the placement tube (22). The sample can be placed tilted in the placement tube (22) for centrifugation. A locking structure is provided between the upper support plate (20) and the lower support plate (21) to lock the position of the upper support plate (20).
2. The grain heavy metal content detection device according to claim 1, characterized in that: The upper support plate (20) and the lower support plate (21) are circular plates with the same diameter. The motor is fixedly installed with the main body (10), and the output shaft of the motor is connected to the lower support plate (21) through a coupling.
3. The grain heavy metal content detection device according to claim 1, characterized in that: The support (23) is a deformable rubber ring. The placement tube (22) passes through the central hole of the support (23). The upper and lower ends of the support (23) are provided with annular flanges. The flanges are integrally formed with the support (23). The upper support plate (20) and the lower support plate (21) are both provided with round holes for installing the support (23). The support (23) is interference-fitted with the round holes.
4. The grain heavy metal content detection device according to claim 3, characterized in that: The end of the support (23) is provided with several deformation grooves (24), and the deformation grooves (24) are fan-shaped grooves.
5. The grain heavy metal content detection device according to claim 1, characterized in that: The locking structure includes a vertical shaft (30), a positioning hole (31), a thrust ring (32), a butterfly washer (33), and a screw (34). The vertical shaft (30) is fixedly connected to the lower support plate (21), and the upper support plate (20) is rotatably connected to the vertical shaft (30). Several positioning holes (31) are opened on the top of the upper support plate (20). The thrust ring (32) can be engaged with the positioning hole (31). A threaded hole is opened at the upper end of the vertical shaft (30). The screw (34) is threadedly connected to the vertical shaft (30). The butterfly washer (33) is disposed between the thrust ring (32) and the screw (34).
6. The grain heavy metal content detection device according to claim 5, characterized in that: The vertical shaft (30) is fixed to the top center of the lower support plate (21) by full welding. The upper support plate (20) is fixedly installed with a bushing, and the vertical shaft (30) is rotatably connected to the bushing.
7. The grain heavy metal content detection device according to claim 5, characterized in that: The thrust ring (32) is annular, and a protrusion is fixedly provided at the bottom of the thrust ring (32). The protrusion is in clearance fit with the positioning hole (31). The upper end of the upper support plate (20) is provided with a number of positioning holes (31) in an annular array.