Calibration device for heavy metal rapid detector

Abstract

The invention relates to a heavy metal rapid detector calibration device. Comprising a calibration cup and a calibration disc, a containing groove used for containing the calibration cup is formed in the calibration disc, a feeding cavity is formed in the position, corresponding to a powder inlet in the calibration cup, of the containing groove, a spiral feeding mechanism is arranged in the feeding cavity to achieve quantitative feeding of heavy metal powder, and inserting structures are correspondingly arranged at the bottom of the containing groove and the bottom of the calibration cup. Comprising a one-way conduction structure of a liquid supply port and a liquid inlet through a one-way valve and a butt joint structure of a stirring mechanism, during calibration, the amount of heavy metal powder added into a calibration cup is controlled by controlling a spiral feeding mechanism, and the amount of a mixed liquid medium added into the calibration cup is controlled by controlling a control valve on a liquid supply channel; the technical problems that in an existing calibration mode, the using amount of accessories such as a disposable container and a sample cup is large, operation is tedious and troublesome, efficiency is low, and the calibration speed is seriously restricted are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to heavy metal rapid detector calibration device. BACKGROUND

[0002] The heavy metal detector is mainly used for quantitative analysis of lead, cadmium, mercury, arsenic, chromium and other heavy metal elements in food, water, soil and other media, and serves the safety screening of food and drug supervision, environmental monitoring and agricultural production fields. Its working principle is: the primary X-ray is emitted by the X-ray tube, incident to the sample, and the heavy metal elements to be tested in the sample are excited by high-energy X-ray to generate characteristic X-ray, which is received by a high-performance silicon drift detector. After data processing, the content of heavy metal elements is obtained.

[0003] As Figure 1 A commonly used food heavy metal rapid detector is shown. A mounting threaded hole is arranged on the bottom plate in the detection chamber, and a sample tray is installed through bolts. A plurality of placing grooves for placing sample cups are arranged on the sample tray. During detection, the sample in the placing groove is clamped and placed at the detection position for detection by the clamping jaw.

[0004] In order to realize the calibration of the heavy metal rapid detector, the value error and the measurement repeatability are first calibrated. The calibration of the value error needs to meet the following conditions: the high, medium and low content ranges (referring to the content of the target heavy metal in corn starch or grain starch medium) are respectively taken, and the standard substance of the taken value is provided, for example, the standard substance with a content value of 0.1 mg / kg is provided, and the heavy metal rapid detector to be calibrated is used to detect the standard substance. The error value of the reading of the detection and the calibrated content of the standard substance is compared, and the detection error is analyzed by repeatedly detecting and comparing the standard substances with multiple content values, so as to calibrate and adjust.

[0005] However, in the current calibration process, multiple calibration substances with different contents need to be manually prepared and labeled and stored. During the calibration process, multiple sample cups are needed to hold standard substances with different content values. The use amount of disposable containers, sample cups and other accessories is large, the operation is complicated and time-consuming, the efficiency is low, and the calibration speed is seriously restricted. SUMMARY

[0006] The purpose of the present application is to provide a heavy metal rapid detector calibration device to solve the technical problem that the use amount of disposable containers, sample cups and other accessories is large, the operation is complicated and time-consuming, the efficiency is low, and the calibration speed is seriously restricted in the existing calibration method.

[0007] The technical scheme of the present application is as follows: the heavy metal rapid detector calibration device comprises: The calibration cup has the same size as the sample cup, and a powder inlet for heavy metal powder is arranged on the side wall. A mounting hole is arranged at the bottom axis, and a stirring shaft tube is sealingly and rotatably arranged in the mounting hole. A stirring blade is vertically connected to the upper end of the stirring shaft tube. A driven gear ring is arranged on the lower end of the stirring shaft tube which extends out of the lower surface of the calibration cup. A feeding pipe is sealingly arranged in the stirring shaft tube. The upper end of the feeding pipe is fixedly connected to the inner wall of the calibration cup through a mounting rod. The upper end of the feeding pipe is provided with a liquid outlet which is in communication with the inner cavity of the calibration cup. The lower end of the feeding pipe is provided with a liquid inlet. A one-way valve is arranged at the liquid inlet and is upwardly and unidirectionally communicated. The calibration disc is provided with a plurality of placing grooves for placing the calibration cup. A cylindrical feeding cavity is arranged on the side wall of the placing groove corresponding to the powder inlet. A spiral feeding mechanism is arranged in the feeding cavity. The upper part of the calibration disc is provided with a powder feeding port corresponding to the feeding cavity. The powder feeding port is in communication with the feeding cavity. A top rod is arranged at the bottom center of the placing groove and protrudes upwardly. The top rod is used for inserting into the liquid inlet and opening the one-way valve. A liquid supply port is arranged around the top rod and has the same diameter and axis as the liquid inlet. The liquid supply port is in communication with a liquid supply channel arranged in the calibration disc. A control valve is arranged on the liquid supply channel. An annular plug-in groove is coaxially arranged outside the liquid supply port, so that the lower end of the stirring shaft tube and the driven gear ring can be inserted into the annular plug-in groove. A stirring motor and a driving gear are also arranged in the annular plug-in groove. The stirring motor drives the stirring shaft tube to rotate through the driving gear and the driven gear ring. During calibration, the amount of heavy metal powder added into the calibration cup is controlled through the spiral feeding mechanism. The amount of mixed liquid medium added into the calibration cup is controlled through the control valve on the liquid supply channel, so as to adjust the content of the calibration substance.

[0008] The heavy metal rapid detector calibration device has the beneficial effects that: when in use, the sample tray of the heavy metal rapid detector can be disassembled, then the calibration disc is installed at the installation threaded hole through bolts, so that the calibration disc replaces the sample tray, then each calibration cup is placed in the placing groove on the calibration disc in correspondence, the powder inlet is butted with the feeding cavity, the stirring shaft tube and the driven gear ring installed thereon are inserted into the annular insertion groove, and the driven gear ring is engaged with the driving gear, at the same time, the ejector rod is inserted into the liquid inlet of the feeding tube and pushes open the one-way valve, so that the liquid supply opening is communicated with the liquid inlet, before calibration, the amount of heavy metal powder and the amount of mixed liquid medium required to be fed into the calibration cup are controlled according to the calculation value, the heavy metal powder is pre-placed in the powder feeding opening and moves to the powder inlet along the feeding cavity through the screw feeding mechanism, and then enters the calibration cup, the amount of heavy metal powder fed is controlled by controlling the screw feeding mechanism; the mixed liquid medium is the mixed liquid that can be used by part of pure starch and other foods, the amount of mixed liquid medium fed into the calibration cup is controlled by controlling the control valve on the liquid supply channel, and the amounts of the two are cooperatively controlled, so that the proportion of the two is controlled. The setting of the stirring motor and the stirring blade can ensure that the mixed substances are fully and uniformly mixed, and can prevent precipitation during calibration.

[0009] As can be seen from the above process, the calibration device can realize calibration of the heavy metal rapid detector, manual operation during calibration is very simple, the whole calibration process, including the change and adjustment of the content of the standard substance, can be automatically completed, the degree of automation is higher, and the amount of disposable containers and sample cups during the whole process is small, only a few calibration cups are required to complete multiple calibration processes.

[0010] On the basis of the above scheme, the powder inlet is a tapered hole that is flared from the outside of the calibration cup to the inside of the calibration cup. The setting of the tapered hole ensures that the heavy metal powder does not stay at the rim of the powder inlet.

[0011] On the basis of the above scheme, the bottom of the placing groove is provided with a limit switch, the limit switch controls the stirring motor, and when the calibration cup is placed in the placing groove, the limit switch is pressed to start the stirring motor. The setting of the limit switch can control the stirring motor to start automatically when needed.

[0012] On the basis of the above scheme, the calibration disc has a cavity, and the cavity is provided with a battery and a controller.

[0013] On the basis of the above scheme, the cavity is provided with the mixed liquid medium supply source, the mixed liquid medium supply source comprises a mixed liquid barrel for containing the mixed liquid medium, the mixed liquid barrel is provided with a stirring mechanism and a suction pump, and the outlet of the suction pump is communicated with the liquid supply channel.

[0014] Based on the above scheme, the following improvements are made: the feeding chamber is set with its axis gradually tilted upwards from the direction away from the placement groove to the direction closer to the placement groove.

[0015] Based on the above scheme, the following improvements are made: the calibration cup and calibration plate are made of non-metallic materials. Attached Figure Description

[0016] Figure 1 This is a front view of a prior art rapid food heavy metal detector. Figure 2 This is a top view schematic diagram of a specific embodiment of the calibration device for a rapid heavy metal detector of the present invention. Figure 3 for Figure 1 Front view (partial section); Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 for Figure 4 A magnified view of a section at point B in the middle; Figure 6 for Figure 4 A schematic diagram showing the status during the removal of the corresponding calibration cup; Figure 7 for Figure 6 A magnified view of a section at point C; In the diagram: 1-Base plate, 2-Sample tray, 3-Sample cup; 4-Calibration cup, 41-Powder inlet, 42-Mounting hole, 43-Stirring shaft tube, 44-Stirring blade, 45-Driven gear ring, 46-Feed pipe, 461-Liquid outlet, 462-Liquid inlet, 463-One-way valve, 4631-Conical surface, 4632-Spherical valve core, 4633-Conical spring, 4634-Spring stop, 47-Mounting rod, 5-Calibration disc, 51-Placement slot, 52-Feeding chamber, 53-Screw feeding mechanism, 531-Screw blade, 532-Rotating shaft, 533-Connecting rod, 534-Bearing, 535-Feeding motor, 54-Powder inlet, 55-Top rod, 56-Liquid supply port, 57-Liquid supply channel, 58-Annular insertion slot, 59-Stirring motor, 591-Drive gear, 510-Bolt hole. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0021] A specific embodiment of the calibration device for the rapid heavy metal detector of the present invention: as follows Figures 2-7 As shown, the calibration device for the rapid heavy metal detector includes a calibration cup 4 and a calibration pan 5, which can be easily disassembled and transported.

[0022] Among them, such as Figure 1 , 3 As shown, the calibration cup 4 has the same external dimensions as the sample cup, meaning its shape and size are identical, allowing for seamless adaptation of the grippers of the heavy metal rapid detector. The side wall of the calibration cup 4 is equipped with a powder inlet 41 for introducing heavy metal powder, which is a high-purity standard powder used for calibration testing. Figure 4 As shown, a mounting hole 42 is provided at the bottom axis of the calibration cup 4. The mounting hole 42 is a round hole, and a stirring shaft tube 43 is rotatably fitted into the mounting hole 42 using a step seal. A stirring blade 44 is vertically connected to the upper end of the stirring shaft tube 43, meaning the stirring blade 44 is arranged radially along the stirring shaft tube 43. There are two or more stirring blades 44, and each stirring blade 44 is evenly distributed circumferentially along the stirring shaft tube 43. Figure 5As shown, a driven gear ring 45 is installed on a section of the lower end of the stirring shaft tube 43 that extends from the lower surface of the calibration cup 4. The driven gear ring 45 is installed, for example, by keyway and key teeth, or by welding, bonding, etc. The stirring shaft tube 43 is sealed with a feed pipe 46, that is, the outer diameter of the feed pipe 46 is the same as the inner diameter of the stirring shaft tube 43. The two are matched with high precision and have rotational sealing performance. Lubricating grease can also be filled between the two to further improve the lubrication and sealing performance. The upper end of the feed pipe 46 is fixedly connected to the inner wall of the calibration cup 4 via a mounting rod 47. The mounting rod 47 is arranged radially along the feed pipe 46, and there are two mounting rods 47 symmetrically arranged about the axis of the feed pipe 46. The upper end of the feed pipe 46 is provided with a liquid outlet 461 that communicates with the inner cavity of the calibration cup 4. The liquid outlet 461 is arranged radially along the feed pipe 46, and there is more than one outlet. The lower end of the feed pipe 46 is provided with a liquid inlet 462, and a one-way valve 463 that conducts upward in one direction is provided at the liquid inlet 462. The one-way valve 463 includes a conical surface 4631 located on the inner wall of the inlet 462 with an increasing diameter from bottom to top, a spherical valve core 4632 for sealing engagement with the conical surface 4631, a conical spring 4633, and an annular spring stop 4634 fixed to the channel of the inlet 462. One end of the conical spring 4633 abuts against the spring stop 4634, and the other end abuts against the spherical valve core 4632 to provide elastic force for the spherical valve core 4632 to press against the conical surface 4631.

[0023] like Figure 2 , 3 As shown, the calibration tray 5 has multiple placement slots 51, and in this embodiment, six slots are provided for placing the calibration cups 4, such as... Figure 3 , 4 As shown, a cylindrical feeding chamber 52 is provided on the side wall of the placement groove 51 corresponding to the powder inlet 41 on the calibration cup 4. The feeding chamber 52 is gradually inclined upwards from the direction away from the placement groove 51 towards the direction of the placement groove 51. This arrangement ensures that the heavy metal powder pushed by the screw feeding mechanism 53 will not fall into the calibration cup 4 due to its own weight, but will only fall into the calibration cup 4 from the feeding chamber 52 when pushed by the screw feeding mechanism 53. The screw feeding mechanism 53 is installed inside the feeding chamber 52, and a powder inlet 54 is provided on the upper part of the calibration disk 5 corresponding to the feeding chamber 52, and the powder inlet 54 is connected to the feeding chamber 52. Figure 4As shown, the spiral feeding mechanism 53 includes a feeding motor 535 and a rotating shaft 532 driven by the feeding motor 535. The two ends of the rotating shaft 532 are rotatably assembled in the feeding chamber 52 through bearings 534 and at least two connecting rods 533 connected to the bearings 534, respectively. The connecting rods 533 do not affect the movement of the heavy metal powder. The rotating shaft 532 is coaxially arranged with the feeding chamber 52. Spiral blades 531 are coaxially mounted on the rotating shaft 532. An elastic sealing scraper is installed on the outer circumferential surface of the spiral blades 531 so as to squeeze the inner wall of the feeding chamber 52 tightly and ensure that the heavy metal powder does not flow back from the gap between the spiral blades 531 and the inner wall of the feeding chamber 52.

[0024] like Figure 5 As shown, a top rod 55 protruding upwards is provided at the bottom center of the placement tank 51 for inserting into the liquid inlet 462 and opening the one-way valve 463. After the top rod 55 contacts the ball valve core 4632 of the one-way valve 463, it pushes the ball valve core 4632 to compress the cone spring 4633, thereby forming a channel between the ball valve core 4632 and the cone surface 4631. A liquid supply port 56 with the same diameter and coaxiality as the liquid inlet 462 is provided around the top rod 55. The liquid supply port 56 is connected to the mixed liquid medium supply source through the liquid supply channel 57 provided in the calibration plate 5. A control valve is provided on the liquid supply channel 57. The mixed liquid medium refers to a mixture formed by mixing pure starch or other non-metallic powder with water in a specific ratio, which is used to simulate the part of the food to be tested other than heavy metals.

[0025] like Figure 5 As shown, an annular insertion groove 58 is coaxially provided outside the liquid supply port 56 for the lower end of the stirring shaft tube 43 and the driven gear ring 45 to be inserted. The annular insertion groove 58 is also provided with a stirring motor 59 and a drive gear 591. The stirring motor 59 meshes with the driven gear ring 45 through the drive gear 591 to drive the stirring shaft tube 43 to rotate. During calibration, the amount of heavy metal powder added to the calibration cup 4 is controlled by controlling the screw feeding mechanism 53, and the amount of mixed liquid medium added to the calibration cup 4 is controlled by controlling the control valve on the liquid supply channel 57 to prepare calibration substances with different contents.

[0026] The powder inlet 41 is a tapered hole that flares outward from the outside of the calibration cup 4 into the inside of the calibration cup 4. The tapered hole prevents heavy metal powder from accumulating at the edge of the powder inlet 41. The calibration cup 4 and the calibration disk 5 are made of non-metallic materials.

[0027] When using the heavy metal rapid detector calibration device, it can... Figure 1The sample tray of the rapid heavy metal detector shown is removed, and then the calibration plate 5 is installed in the mounting threaded hole using bolts, so that the calibration plate 5 replaces the sample tray. Then, each calibration cup 4 is placed in the placement groove 51 on the calibration plate 5, so that the powder inlet 41 is connected to the feeding chamber 52, and the stirring shaft tube 43 and the driven gear ring 45 installed on it are inserted into the annular insertion groove 58, and the driven gear ring 45 is engaged with the driving gear 591. At the same time, the push rod 55 is inserted into the liquid inlet 462 of the feed pipe 46 and opens the one-way valve 463, so that the liquid supply port 56 is connected to the liquid inlet 462. Before calibration, The amount of heavy metal powder and the amount of the mixed liquid medium entering the calibration cup 4 are controlled according to the calculated values. The heavy metal powder is pre-added to the powder inlet and moves along the feeding chamber 52 to the powder inlet 41 by the screw feeding mechanism 53, and then enters the calibration cup 4. The amount of heavy metal powder added is controlled by controlling the screw feeding mechanism 53. The mixed liquid medium is a mixture simulating the usable portion of pure starch and other food products. The amount of the mixed liquid medium entering the calibration cup 4 is controlled by controlling the control valve on the liquid supply channel 57. The coordinated control of the amounts of the two achieves the proportional control of the two. The setting of the stirring motor 59 and the stirring blade 44 ensures that the mixture is fully and evenly mixed and prevents sedimentation during the calibration process.

[0028] As can be seen from the above process, the calibration device of this application can realize the calibration of the rapid heavy metal detector. Moreover, the manual operation during the calibration process is very simple. The entire calibration process, including the change and adjustment of the content of the standard substance, can be completed automatically, with a higher degree of automation. Furthermore, the amount of disposable containers and sample cups used in the whole process is very small, and only a few calibration cups are needed to complete multiple calibration processes.

[0029] In other embodiments, a limit switch is provided at the bottom of the placement tank 51. The limit switch controls the stirring motor 59. When the calibration cup 4 is placed in the placement tank 51, pressing the limit switch turns on the stirring motor 59. The limit switch allows the stirring motor 59 to start automatically when needed. The calibration plate 5 has a cavity, in which a battery and a controller are installed. A mixing medium supply source is installed in the cavity. The mixing medium supply source includes a mixing tank for containing the mixing medium. The mixing tank is equipped with a stirring mechanism and a suction pump. The outlet of the suction pump is connected to the supply channel 57.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A calibration device for a rapid heavy metal detector, characterized in that, include: The calibration cup has the same external dimensions as the sample cup. It has a powder inlet on its side wall for feeding heavy metal powder, and a mounting hole at the bottom axis. A stirring shaft tube is sealed and rotatably mounted in the mounting hole. A stirring blade is vertically connected to the upper end of the stirring shaft tube. A driven gear ring is installed on the lower end of the stirring shaft tube, which extends from the lower surface of the calibration cup. A feed tube is sealed inside the stirring shaft tube. The upper end of the feed tube is fixedly connected to the inner wall of the calibration cup through a mounting rod. The upper end of the feed tube has a liquid outlet that communicates with the inner cavity of the calibration cup, and the lower end of the feed tube has a liquid inlet. A one-way valve that leads upwards is installed at the liquid inlet. The calibration tray has multiple placement slots for placing calibration cups. A cylindrical feeding chamber is provided on the side wall of the placement slot corresponding to the powder inlet. A screw feeding mechanism is installed in the feeding chamber. A powder inlet is provided on the upper part of the calibration tray corresponding to the feeding chamber, and the powder inlet is connected to the feeding chamber. The bottom center of the placement tank is provided with an upward protruding push rod for inserting into the liquid inlet and opening the one-way valve. The outer periphery of the push rod is provided with a liquid supply port that is coaxial with the liquid inlet and has the same diameter. The liquid supply port is connected to the mixed liquid medium supply source through a liquid supply channel in the calibration plate. A control valve is provided on the liquid supply channel. An annular insertion groove is coaxially provided outside the liquid supply port for the lower end of the stirring shaft tube and the driven gear ring to be inserted. The annular insertion groove is also equipped with a stirring motor and a drive gear. The stirring motor drives the stirring shaft tube to rotate through the meshing of the drive gear and the driven gear ring. During calibration, the amount of heavy metal powder added to the calibration cup is controlled by controlling the screw feeding mechanism, and the amount of mixed liquid medium added to the calibration cup is controlled by controlling the control valve on the liquid supply channel, so as to prepare calibration substances with different contents.

2. The calibration device for a rapid heavy metal detector according to claim 1, characterized in that, The powder inlet is a tapered hole that expands from the outside of the calibration cup to the inside of the calibration cup.

3. The calibration device for a rapid heavy metal detector according to claim 1, characterized in that, A limit switch is installed at the bottom of the placement tank. The limit switch controls the stirring motor. When the calibration cup is placed in the placement tank, press the limit switch to turn on the stirring motor.

4. The calibration device for a rapid heavy metal detector according to claim 1, characterized in that, The calibration disk has a cavity inside, where the battery and controller are installed.

5. The calibration device for a rapid heavy metal detector according to claim 4, characterized in that, The cavity is equipped with the mixed liquid medium supply source, which includes a mixed liquid tank for containing the mixed liquid medium. The mixed liquid tank is equipped with a stirring mechanism and a suction pump, and the outlet of the suction pump is connected to the liquid supply channel.

6. The calibration device for a rapid heavy metal detector according to claim 1, characterized in that, The feeding chamber is set with its axis gradually tilting upwards from the place trough to the place trough.

7. The calibration device for a rapid heavy metal detector according to claim 1, characterized in that, The calibration cup and calibration pan are made of non-metallic materials.

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