Automatic pretreatment equipment and method for food heavy metal detection sample

Abstract

The invention relates to the technical field of food safety detection, in particular to a food heavy metal detection sample automatic pretreatment device and a method thereof.The food heavy metal detection sample automatic pretreatment device comprises a mounting base, and a material loading device and a detection table are arranged at the positions, close to the edge, of the mounting base; a pipe taking device is rotatably arranged at the center position of the mounting base and comprises a mounting stand column fixedly connected to the center of the mounting base, a rotating seat is rotatably mounted on the mounting stand column, and first sliding arms are slidably mounted at the positions, corresponding to the stations, of the outer side wall of the rotating seat. According to the automatic reagent filling and detecting device, a reagent tube can be driven to automatically complete reagent filling and detecting, the detecting efficiency is effectively improved, and the detecting safety and accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of food safety detection, and particularly relates to an automatic pretreatment device and method for food heavy metal detection samples. Background Art

[0002] In the field of food processing, due to factors such as the production environment, processing process, or the raw materials themselves, the food produced often contains heavy metals such as lead, cadmium, mercury, and arsenic. Long-term intake of excessive heavy metals will cause harm to human health. Therefore, food processing enterprises need to detect the residual heavy metal content in food.

[0003] When detecting the heavy metal content, the commonly used detection methods all require pretreatment of the sample to be tested, that is, adding corresponding chemical reagents to the sample to be tested, fully carrying out chemical reactions, and then sending the sample to be tested into the detection instrument for detection. Since most of the reagents used in the pretreatment process are strong acids and have strong corrosiveness, manual operation is somewhat dangerous, and manual operation is also prone to cause deviation in the dosing amount. Especially when facing a large number of samples to be detected, the limitations of manual operation become more prominent and cannot adapt to the large-scale and high-efficiency production rhythm of the modern food processing industry.

[0004] For the above reasons, the present invention provides an automatic pretreatment device and method for food heavy metal detection samples. Cooperating with different detection instruments, it can realize the detection of food heavy metal content, effectively improve the detection efficiency, and enhance the safety and accuracy of detection. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide an automatic pretreatment device and method for food heavy metal detection samples. The reagent tube is clamped by a clamping assembly, and the reagent tube is driven to automatically quantitatively add reaction reagents, realizing the automation of the sample pretreatment process, avoiding direct contact between workers and strong acid reagents, and also avoiding dosing amount deviation caused by manual operation, improving the safety and accuracy of detection.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: An automatic pretreatment device for food heavy metal detection samples, including an installation base. A loading device and a detection table are arranged at positions close to the edge of the installation base. It is characterized in that: a tube-taking device is rotatably arranged at the central position of the installation base. Along the rotation direction of the tube-taking device on the installation base, a feeding station, a feeding station, a detection station, and a discharging station are sequentially arranged; the tube-taking device includes an installation column fixedly connected to the center of the installation base. A rotating seat is rotatably installed on the installation column. First sliding arms are slidably installed at positions corresponding to each station on the outer side wall of the rotating seat. One end of the first sliding arm far from the rotating seat is rotatably installed with an annular shell, and a clamping assembly is arranged inside the annular shell.

[0007] The following are further optimizations of the above technical solution by the present invention: A sliding component is provided on the first sliding arm. The first sliding arm is slidably mounted on the rotating seat through the sliding component, and a sliding driving component is drivingly connected to the sliding component for driving the first sliding arm to move up and down.

[0008] Further optimization: The loading device includes a first loading table and a second loading table rotatably mounted on the mounting base. A plurality of placement grooves are formed on the upper surfaces of the first loading table and the second loading table, and a reagent tube is placed in each placement groove. A loading driving component is fixedly mounted at the bottom of the mounting base, and the power output end of the loading driving component is drivingly connected to the first loading table and the second loading table.

[0009] Further optimization: The detection table is fixedly mounted at a position corresponding to the detection station on the mounting base. A placement groove is also formed at the center position of the detection table. Sealing devices are fixedly mounted at the tops of the placement grooves of the second loading table and the detection table. A sealing plate is fixedly connected to the reagent tube at a position corresponding to the sealing device. A vacuum adsorption device is further provided at the bottom of the placement grooves of the second loading table and the detection table.

[0010] Further optimization: A top rod is slidably mounted in the mounting column. The lower end of the top rod is fixedly connected to a push rod assembly, and the upper end of the top rod is fixedly connected to a top plate. A support plate is fixedly connected to the outer side of the top plate at a position corresponding to each station along the circumferential direction. A reagent kit is fixedly mounted on the support plate corresponding to the feeding station, and a quantitative filling component is fixedly mounted at the center position of the bottom of the reagent kit.

[0011] Further optimization: The clamping component includes clamping plates. A plurality of clamping plates are evenly spaced along the circumferential direction of the annular shell. A clamping rod is fixedly connected to the side of the clamping plate away from the center of the annular shell. The clamping rod penetrates through the outer surface of the annular shell, and a second spring is sleeved on the clamping rod. The two ends of the second spring are fixedly connected to the clamping plate and the annular shell respectively. The upper end of the clamping plate is adapted to the outer shape of the reagent tube, and the lower end of the clamping plate is inclined in a direction away from the center of the annular shell.

[0012] Further optimization: A tube-taking driving component is fixedly mounted on the mounting base. The tube-taking driving component is drivingly connected to the rotating seat for driving the rotating seat to rotate.

[0013] Further optimization: The annular shell is rotatably mounted on the first sliding arm. A mixing driving component is further fixedly connected to the first sliding arm. The mixing driving component is drivingly connected to the annular shell for driving the annular shell to rotate.

[0014] Further optimization: an alignment detection device is also provided, and the alignment detection device is used to detect whether the first sliding arm and the support plate, and the first sliding arm and the placement slot are aligned, and the signal on the alignment detection device is connected to the control device.

[0015] Further optimization: A method for automatic pretreatment of food heavy metal detection samples, based on the above-mentioned automatic pretreatment device for food heavy metal detection samples, comprises the following steps: S1: Put the reagent tubes containing the samples to be tested in batches into the placement slots of the first loading platform, start the tube taking drive assembly, drive the rotating seat to rotate, and align the first clamping assembly with the first reagent tube on the first loading platform; S2: The alignment detection device detects the signal change and transmits the signal to the control device, and the control device controls the sliding drive assembly corresponding to the loading station to move, driving the first sliding arm to move downward to complete the clamping of the reagent tube; S3: The control device controls the sliding drive assembly to move in the reverse direction, and the first sliding arm moves upward, driving the first reagent tube to leave the placement slot; S4: The tube taking drive assembly drives the rotating seat to rotate, and the first reagent tube is moved to the feeding station. The push rod assembly moves to adjust the height of the quantitative filling assembly to perform quantitative filling of the reagent. At the same time, the loading drive assembly starts to drive the first loading platform to rotate, and the second clamping assembly is aligned with the second reagent tube on the first loading platform. Repeat the above SS steps to take the second reagent tube out of the placement slot; S5: The mixing drive assembly drives the annular shell to rotate, and then drives the reagent tube clamped by the clamping assembly to rotate, so that the reagent in the reagent tube is fully mixed with the sample to be tested; S6: The rotating seat rotates to move the first reagent tube to the detection station, and the corresponding sliding drive assembly moves to drive the first sliding arm to move downward, and the reagent tube is sent to the placement slot of the detection table. At the same time, the second reagent tube is moved to the feeding station for quantitative filling of the reagent; S7: Start the vacuum adsorption device under the testing table to fix the first reagent tube in the placement slot, the sliding drive assembly moves in the reverse direction, the first sliding arm moves back to its position, and the first reagent tube is separated from the clamping assembly; S8: Start the external detection device to detect the sample in the reagent tube on the detection table and output the detection result; S9: After the test is completed, the clamping assembly cooperates with the vacuum adsorption device at the bottom of the second loading platform to transfer the reagent tubes on the test platform to the second loading platform, and the workers remove the samples that have been tested in batches.

[0016] The present invention adopts the above technical solution and has the following beneficial effects: The present invention drives the reagent tube to move cyclically on the device through the clamping assembly provided on the tube-taking device, automatically adds the reaction reagent, and realizes the automatic pretreatment of the test sample in the food heavy metal detection process, avoiding direct contact between workers and strong acid reagents and improving the safety of the pretreatment process.

[0017] The present invention provides a quantitative filling assembly at the bottom of the reagent kit, accurately fills the relevant reagents into the reagent tube according to needs, avoids the filling amount deviation caused by manual operation, and improves the accuracy of the detection results.

[0018] A plurality of placement grooves are provided on the first loading table and the second loading table of the present invention, which can batch place reagent tubes, reduce the operation frequency of workers, and improve work efficiency.

[0019] A push rod device is provided below the ejector rod of the present invention to push the ejector rod to move up and down, adjust the height position of the feeding device, and make the filling port of the quantitative filling assembly insert into the reagent tube to be suitable for accurately filling reagent tubes of different heights.

[0020] The present invention will be further described below in conjunction with the drawings and embodiments. Description of the Drawings

[0021] Figure 1 is a three-dimensional view of the overall structure of Embodiment 1 of the present invention; Figure 2 is a schematic diagram of the overall internal structure of Embodiment 1 of the present invention; Figure 3 is the front view of the loading device of Embodiment 1 of the present invention; Figure 4 is a three-dimensional view of the loading device of Embodiment 1 of the present invention; Figure 5 is Figure 3 the enlarged view of part A in Figure 6 is the front view of the tube-taking device of Embodiment 1 of the present invention; Figure 7 is a three-dimensional view of the tube-taking device of Embodiment 1 of the present invention; Figure 8 is the front view of the clamping assembly of Embodiment 1 of the present invention; Figure 9 is the top view of the clamping assembly of Embodiment 1 of the present invention; Figure 10 is the schematic diagram of the internal structure of the sliding assembly of Embodiment 2 of the present invention; Figure 11 is the schematic diagram of the internal structure of the sliding assembly of Embodiment 3 of the present invention.

[0022] In the figure: 1. Installation base; 2. Material loading device; 201. First material loading table; 202. Second material loading table; 203. Sealing device; 204. Placing groove; 205. Material loading drive assembly; 206. Material loading transmission assembly; 207. Vacuum adsorption device; 208. Connecting shaft; 3. Tube picking device; 301. Installation column; 302. Rotating seat; 303. First sliding groove; 304. First sliding arm; 305. Slide bar; 306. First spring; 307. Annular shell; 308. Clamping assembly; 3081. Clamping plate; 3082. Clamping rod; 3083. Second spring; 309. Mixing drive assembly; 310. Mixing transmission assembly; 311. Top plate; 312. Support plate; 313. Sliding drive assembly; 314. Kit; 315. Quantitative filling assembly; 316. Tube picking transmission assembly; 317. Tube picking drive assembly; 318. Thumb rod; 319. Push rod assembly; 320. Second sliding groove; 321. Second sliding arm; 322. Third spring; 323. Lead screw; 4. Detection table; 5. Alignment detection device; 6. Control device; 7. Reagent tube; 8. Sealing plate. Detailed implementation mode

[0023] Example 1: As Figure 1-2 shown, an automatic pretreatment device for food heavy metal detection samples includes an installation base 1. The installation base 1 is a hollow cylindrical structure. A material loading device 2 and a detection table 4 are arranged at positions close to the edge of the installation base 1. A tube picking device 3 is rotatably arranged at the center position of the installation base 1. Along the rotation direction of the tube picking device 3 on the installation base 1, a feeding station, a feeding station, a detection station and a discharging station are sequentially arranged. The number of feeding stations can be increased or decreased according to the types of reagents to be filled.

[0024] The material loading device 2 includes a first material loading table 201 and a second material loading table 202 rotatably installed on the installation base 1. The first material loading table 201 and the second material loading table 202 correspond to the positions of the feeding station and the discharging station respectively. Connecting shafts 208 are fixedly connected to the lower sides of the first material loading table 201 and the second material loading table 202. The connecting shafts 208 are rotatably installed on the installation base 1.

[0025] As Figure 3-4 shown, placing grooves 204 are opened on the upper surfaces of the first material loading table 201 and the second material loading table 202 along their circumferential directions. A plurality of placing grooves 204 are evenly spaced. A reagent tube 7 is placed in each placing groove 204. The reagent tube 7 is used to hold the sample to be tested. The shape of the placing groove 204 is adapted to the shape of the reagent tube 7, and the reagent tubes 7 can be placed in batches for operation, reducing the operation frequency of workers and lowering the labor intensity.

[0026] A loading driving component 205 is fixedly installed at the bottom of the installation base 1. A power output end of the loading driving component 205 is fixedly connected with a loading transmission component 206. One end of the loading transmission component 206 far from the loading driving component 205 is fixedly connected to the lower end of a connecting shaft 208. When the loading driving component 205 operates, the first loading table 201 and the second loading table 202 are driven to rotate through the loading transmission component 206, so that the reagent tubes 7 in each placement groove 204 can be taken out or placed by the tube taking device 3.

[0027] In this embodiment, the loading driving component 205 is set as a servo motor, and the loading transmission component 206 is a transmission gear set. The transmission gear set includes a driving gear fixedly connected to the power output end of the motor and a driven gear fixedly connected to the lower end of the connecting shaft 208. The driving gear and the driven gear are meshed and connected. When a servo motor works to drive the driving gear to rotate, the first loading table 201 and the second loading table 202 are driven to rotate synchronously in opposite directions through the driven gear and the connecting shaft 208.

[0028] Outside this embodiment, an intermediate gear can be added in the transmission gear set to make the first loading table 201 and the second loading table 202 rotate synchronously in the same direction, or an additional servo motor can be added. The two servo motors are respectively used to drive the first loading table 201 and the second loading table 202 to rotate in the required directions.

[0029] Outside this embodiment, the loading driving component 205 can also be selected from a hydraulic motor or a pneumatic motor, and the loading transmission component 206 can also be selected from a combination of a belt and belt pulleys or a combination of a chain and sprockets. The loading driving component 205 outputs rotational power to drive the first loading table 201 and the second loading table 202 to rotate through the loading transmission component 206.

[0030] The detection table 4 is fixedly installed at a position corresponding to the detection station on the installation base 1. A placement groove 204 is also opened at the central position of the detection table 4. The tube taking device 3 clamps the reagent tube 7 and places it into the placement groove 204 of the detection table 4 to cooperate with an external detection device to detect the content of heavy metals in the sample.

[0031] A detection device is externally connected to the detection table 4. In this embodiment, the detection device is an atomic absorption spectrometer. The pretreated sample solution is atomized into ground state atoms. The light source emits characteristic spectral lines corresponding to the element to be measured. When the characteristic light passes through the ground state atom vapor of the target element, the ground state atoms of the target element selectively absorb the light of the corresponding wavelength, resulting in attenuation of the light intensity. The non-target elements do not absorb the light of this wavelength and do not interfere with the detection, so as to detect the content of a certain or certain heavy metals in the sample.

[0032] Except for this embodiment, according to different detection items, other detection instruments can also be externally connected to the detection station 4 to detect the pre-treated samples. The above-mentioned detection instruments are all commonly used detection equipment in the prior art and will not be elaborated in the present invention.

[0033] As Figure 3 and Figure 5 shown, a sealing device 203 is fixedly installed at the top of the placement groove 204 of the second loading platform 202 and the detection station 4. A sealing plate 8 is fixedly connected to the reagent tube 7 at a position corresponding to the sealing device 203. After the reagent tube 7 is placed into the placement groove 204 of the second loading platform 202 and the detection station 4, the sealing plate 8 contacts the sealing device 203 to form a seal.

[0034] A vacuum adsorption device 207 is also provided at the bottom of the placement groove 204 of the second loading platform 202 and the detection station 4. The vacuum adsorption device 207, the sealing device 203 and the sealing plate 8 cooperate with each other to form a negative pressure environment in the placement groove 204 to adsorb the reagent tube 7 in the placement groove 204.

[0035] In this embodiment, the vacuum adsorption device 207 is a vacuum pump, the sealing device 203 is an O-ring, and the diameter of the sealing plate 8 is larger than the diameter of the O-ring, so that the sealing plate 8 can completely cover the O-ring to ensure reliable sealing. The vacuum pump, the O-ring and the sealing plate 8 cooperate with each other to make the placement groove 204 in a negative pressure state to ensure that the reagent tube 7 is firmly adsorbed in the placement groove 204.

[0036] As Figure 6-7 shown, the tube taking device 3 includes a mounting column 301 fixedly connected to the center of the mounting base 1. A rotating seat 302 is rotatably mounted on the mounting column 301. A first sliding groove 303 is provided at a position corresponding to each working station on the outer side wall of the rotating seat 302. The first sliding groove 303 is arranged along the up and down direction of the rotating seat 302. A first sliding arm 304 is installed in each first sliding groove 303. One end of the first sliding arm 304 away from the rotating seat 302 is provided with an annular shell 307, and a clamping assembly 308 is arranged in the annular shell 307.

[0037] A sliding assembly is provided on the first sliding arm 304. The tube taking device 3 is also provided with a sliding driving assembly 313. When the sliding driving assembly 313 acts, the first sliding arm 304 is driven to slide up and down in the first sliding groove 303 through the sliding assembly, and then the clamping assembly 308 is driven to pick up the reagent tube 7 to complete the picking and placing operation of the reagent tube 7.

[0038] A through hole is formed inside the installation column 301. A ejector rod 318 is slidably installed in the through hole. The upper end of the ejector rod 318 is fixedly connected to a top plate 311. At positions corresponding to each station along the circumferential direction on the outside of the top plate 311, a support plate 312 is fixedly connected. On the support plate 312 corresponding to the feeding station, a reagent kit 314 is fixedly installed for holding the reagent to be added. The position of the reagent kit 314 corresponds to the position of the annular shell 307 on the first sliding arm 304. At the central position of the bottom of the reagent kit 314, a quantitative filling assembly 315 is fixedly installed for adding a quantitative reagent into the reagent tube 7 according to a set value.

[0039] In this embodiment, the quantitative filling assembly 315 is a plunger type metering pump. By adjusting the stroke of the plunger reciprocating in the cylinder body, the volume of the liquid discharged each time is controlled, and it is used to add a quantitative reagent into the reagent tube 7, which can not only enable the reagent to fully react with the test sample, but also avoid waste caused by overfilling.

[0040] In addition to this embodiment, the quantitative filling assembly 315 can adopt the method of cooperating a flow meter with an electromagnetic valve. When the outflowing liquid reaches the set value, the electromagnetic valve is controlled to close the liquid outlet to achieve quantitative filling, or other filling devices capable of precisely controlling the liquid flow rate in the existing technologies can be used, so that the sample preparation reagent can be accurately filled according to the set value.

[0041] The bottom end of the ejector rod 318 is fixedly connected to a push rod assembly 319. The fixed end of the push rod assembly 319 is fixedly installed on the installation base 1. The telescopic end of the push rod assembly 319 is fixedly connected to the bottom end of the ejector rod 318. In this embodiment, the push rod assembly 319 can be selected from one of a servo electric cylinder, a servo cylinder or a servo hydraulic cylinder. The telescopic end of the push rod assembly 319 extends or retracts, driving the ejector rod 318 and the top plate 311 to move up and down, and further driving the support plate 312 to move up and down. During the reagent filling process, the telescopic end of the push rod assembly 319 retracts, so that the filling port of the quantitative filling assembly 315 is inserted into the reagent tube 7 to be applicable to accurately fill reagent tubes 7 with different heights.

[0042] In this embodiment, the sliding assembly includes a slide bar 305. The slide bar 305 is fixedly connected to the upper and lower ends of the first sliding groove 303. The first sliding arm 304 is sleeved outside the slide bar 305. The slide bar 305 is used to prevent the first sliding arm 304 from disengaging from the first sliding groove 303 and plays a guiding role in the movement of the first sliding arm 304. A first spring 306 is also arranged in the first sliding groove 303. The first spring 306 is sleeved outside the slide bar 305. The two ends of the first spring 306 are respectively fixedly connected to the bottom surface of the first sliding arm 304 and the bottom surface of the first sliding groove 303. In the natural state, the first sliding arm 304 is located at the topmost end of the first sliding groove 303 under the action of the first spring 306.

[0043] In this embodiment, the sliding drive component 313 can be selected from a servo electric cylinder, a servo air cylinder or a servo hydraulic cylinder. The fixed end of the sliding drive component 313 is fixedly installed on the upper surface of the support plate 312 corresponding to the loading station, the inspection station and the unloading station. The telescopic end passes through the support plate 312 and extends downward. The telescopic end is extended to push the first sliding arm 304 to move downward along the first sliding groove 303, so that the reagent tube 7 in the placement groove 204 is loaded into the clamping component 308. The telescopic end of the sliding drive component 313 retracts, and the first sliding arm 304 moves upward under the action of the first spring 306, driving the reagent tube 7 to leave the placement groove 204.

[0044] like Figure 8-9 As shown, the clamping assembly 308 includes a clamping plate 3081, and a plurality of clamping plates 3081 are evenly spaced along the circumferential direction of the annular shell 307. A clamping rod 3082 is fixedly connected to the side of the clamping plate 3081 away from the center of the annular shell 307. The clamping rod 3082 penetrates the outer surface of the annular shell 307. The outer end of the clamping rod 3082 is raised to prevent the clamping rod 3082 from falling off the annular shell 307. A second spring 3083 is sleeved on the clamping rod 3082 at a position between the clamping plate 3081 and the annular shell 307. The two ends of the second spring 3083 are fixedly connected to the clamping plate 3081 and the annular shell 307, respectively.

[0045] The shape of the upper end of the clamping plate 3081 is adapted to the shape of the reagent tube 7, and the lower end of the clamping plate 3081 is inclined in the direction away from the center of the annular shell 307. Under the action of the second spring 3083, several clamping plates 3081 in the same clamping assembly 308 move toward the center of the annular shell 307 to form a cylindrical cavity with an expanded lower end. The diameter of the upper end of this cavity is smaller than the outer diameter of the reagent tube 7, while the diameter of the lower end is larger than the outer diameter of the reagent tube 7, so that the reagent tube 7 can be smoothly loaded from the lower end of the clamping assembly 308.

[0046] When it is necessary to clamp the reagent tube 7, the first sliding arm 304 moves downward under the action of the sliding drive assembly 313, and the first spring 306 is compressed, driving the clamping assembly 308 to move from the upper end of the reagent tube 7 to the lower end until the upper end of the reagent tube 7 exceeds the upper end of the clamping plate 3081. At this time, the clamping plate 3081 is pushed outward by the reagent tube 7, and the second spring 3083 is compressed. Under the action of the restoring force of the second spring 3083, the clamping plate 3081 clamps the reagent tube 7. After clamping is completed, the external force loaded on the first sliding arm 304 is cancelled, and the first sliding arm 304 moves upward under the action of the restoring force of the first spring 306, driving the reagent tube 7 to leave the placement slot 204.

[0047] Further, the annular shell 307 is rotatably mounted on the first sliding arm 304. One end of a hybrid drive assembly 310 is fixedly connected to the outer side of the annular shell 307, and the other end of the hybrid drive assembly 310 is fixedly connected to a hybrid driving component 309. The hybrid driving component 309 operates to output rotational power, drives the annular shell 307 to rotate through the hybrid drive assembly 310, and further drives the reagent tube 7 clamped by the clamping assembly 308 to rotate. The hybrid driving component 309 intermittently changes the rotation direction, so that the reagent in the reagent tube 7 and the sample to be tested are stirred and fully mixed.

[0048] In this embodiment, the hybrid driving component 309 is a micro motor, and the hybrid drive assembly 310 is a gear set. The driving gear in the gear set is fixedly connected to the power output end of the micro motor, and the driven gear is fixedly connected to the outer side of the annular shell 307 to ensure that the clamping assembly 308 will not interfere with the driven gear when clamping the reagent tube 7.

[0049] In addition to this embodiment, the hybrid driving component 309 can also be selected from a hydraulic motor or a pneumatic motor. The hybrid driving component 309 outputs rotational power and drives the annular shell 307 to rotate through the hybrid drive assembly 310, so that the reagent and the sample to be tested can be fully mixed.

[0050] As Figure 6 shown, a tube taking driving component 317 is fixedly mounted on the mounting base 1. The power output end of the tube taking driving component 317 is fixedly connected to a tube taking drive assembly 316, and one end of the tube taking drive assembly 316 away from the tube taking driving component 317 is fixedly connected to the bottom of the rotating seat 302.

[0051] In this embodiment, the tube taking driving component 317 is a servo motor, and the tube taking drive assembly 316 is a transmission gear set. The transmission gear set includes a driving gear fixedly connected to the power output end of the motor and a driven gear fixedly connected below the rotating seat 302. The driving gear and the driven gear are meshed and connected. The servo motor operates to drive the driving gear to rotate, and further drives the rotating seat 302 to rotate through the driven gear, so that the reagent tube 7 can be transferred between various stations.

[0052] In addition to this embodiment, the tube taking driving component 317 can also be selected from a hydraulic motor or a pneumatic motor, and the tube taking drive assembly 316 can also be selected from a combination of a belt and belt pulleys or a combination of a chain and sprockets. The tube taking driving component 317 outputs rotational power and drives the rotating seat 302 to rotate through the tube taking drive assembly 316, driving the reagent tube 7 to complete the transfer between various stations.

[0053] In order to ensure that the clamping assembly 308 and the quantitative filling assembly 315 can work normally, the automatic pretreatment equipment for food heavy metal detection samples is also provided with an alignment detection device 5 and a control device 6. The alignment detection device 5 and the control device 6 are signal connected. After the alignment detection device 5 detects that the first sliding arm 304 is aligned with the support plate 312 and the first sliding arm 304 is aligned with the placement groove 204, the signal is transmitted to the control device 6, and the control device 6 controls the action of related components.

[0054] In this embodiment, the alignment detection device 5 is a photoelectric sensor and is provided with two groups. The transmitter and receiver of one group are respectively installed on the upper surface of the first sliding arm 304 and the lower surface of the support plate 312, and are used to determine whether the first sliding arm 304 is aligned with the support plate 312. The photoelectric sensor senses the signal change and transmits it to the control device 6. The control device 6 controls the action of the tube-taking drive assembly 317 and the sliding drive assembly 313; the transmitter and receiver of the other group of alignment detection devices 5 are respectively installed on the lower surface of the first sliding arm 304 and the top of the placement groove 204, and are used to determine whether the first sliding arm 304 is aligned with the placement groove 204. The control device 6 controls the action of the tube-taking drive assembly 317, the sliding drive assembly 313 and the loading drive assembly 205.

[0055] The present invention also provides a method for automatically preprocessing food heavy metal detection samples, based on the above-mentioned automatic preprocessing equipment for food heavy metal detection samples, comprising the following steps: S1: Put the reagent tubes 7 containing the samples to be tested in batches into the placement slots 204 of the first loading platform 201, start the tube taking drive assembly 317, drive the rotating seat 302 to rotate, and align the first clamping assembly 308 with the first reagent tube 7 on the first loading platform 201; S2: The alignment detection device 5 detects the signal change and transmits the signal to the control device 6, and the control device 6 controls the sliding drive assembly 313 corresponding to the loading station to move, driving the first sliding arm 304 to move downward, completing the clamping of the reagent tube 7; S3: The control device 6 controls the sliding drive assembly 313 to move in the reverse direction, and the first sliding arm 304 moves upward, driving the first reagent tube 7 to leave the placement slot 204; S4: The tube taking drive assembly 317 drives the rotating seat 302 to rotate, and the first reagent tube 7 is moved to the feeding station. The push rod assembly 319 is actuated to adjust the height of the quantitative filling assembly 315 to perform quantitative filling of the reagent. At the same time, the loading drive assembly 205 is started to drive the first loading platform 201 to rotate, and the second clamping assembly 308 is aligned with the second reagent tube 7 on the first loading platform 201. The above steps S1-S3 are repeated to take the second reagent tube 7 out of the placement slot 204; S5: The hybrid drive assembly 309 operates to drive the annular shell 307 to rotate, thereby driving the reagent tube 7 clamped by the clamping assembly 308 to rotate, so that the reagent in the reagent tube 7 is fully mixed with the sample to be tested; S6: The rotating seat 302 rotates to move the first reagent tube 7 to the detection station. Accordingly, the sliding drive assembly 313 operates to drive the first sliding arm 304 to move downward, and send the reagent tube 7 into the placement groove 204 of the detection table 4. At the same time, the second reagent tube 7 is moved to the feeding station for quantitative filling of the reagent; S7: Start the vacuum adsorption device 207 below the detection table 4 to fixedly adsorb the first reagent tube 7 in the placement groove 204. The sliding drive assembly 313 acts in the reverse direction, and the first sliding arm 304 moves upward and returns to its original position, and the first reagent tube 7 disengages from the clamping assembly 308; S8: Start the peripheral detection device to detect the sample in the reagent tube 7 on the detection table 4 and output the detection result; S9: After the detection is completed, the clamping assembly 308 and the vacuum adsorption device 207 at the bottom of the second loading platform 202 cooperate with each other to transfer the reagent tube 7 on the detection table 4 to the second loading platform 202, and the worker batch-removes the tested samples.

[0056] Embodiment 2: An automatic pretreatment device for food heavy metal detection samples based on the above Embodiment 1. The difference between Embodiment 2 and Embodiment 1 is that a second sliding groove 320 is formed at one end of the bottom surface of the first sliding arm 304 close to the rotating seat 302. The sliding assembly includes a second sliding arm 321. The upper end of the second sliding arm 321 is slidably installed in the second sliding groove 320. The lower end of the second sliding arm 321 is hinged to the bottom end of the first sliding groove 303. A third spring 322 is further arranged in the second sliding groove 320. One end of the third spring 322 is fixedly connected to the end of the second sliding groove 320 away from the rotating seat 302, and the other end is fixedly connected to the upper end of the second sliding arm 321.

[0057] The telescopic end of the sliding drive assembly 313 extends to push the first sliding arm 304 to move downward in the first sliding groove 303, thereby driving the upper end of the second sliding arm 321 to slide away from the rotating seat 302 in the second sliding groove 320, and the third spring 322 is compressed; the telescopic end of the sliding drive assembly 313 retracts. Under the action of the third spring 322, it pushes the upper end of the second sliding arm 321 to move in the reverse direction, and then pushes the first sliding arm 304 to return to its original position, so as to realize the up and down movement of the first sliding arm 304 and complete the picking and placing operation of the reagent tube 7.

[0058] Embodiment 3: An automatic pretreatment device for food heavy metal detection samples based on the above Embodiment 1. The difference between Embodiment 3 and Embodiment 1 is that the sliding component is a lead screw 323 disposed in the first sliding groove 303 in the up and down direction. The upper and lower ends of the lead screw 323 are rotatably connected to the upper and lower ends of the first sliding groove 303. The lead screw 323 is provided with an external thread. A threaded hole is opened at a position corresponding to the lead screw 323 on the first sliding arm 304. The first sliding arm 304 is threadedly connected to the lead screw 323.

[0059] The sliding drive component 313 is a micro motor fixedly connected to the upper end of the lead screw 323. The micro motor works to drive the lead screw 323 to rotate, and then drives the first sliding arm 304 to move up and down. By changing the rotation direction of the micro motor, the moving direction of the first sliding arm 304 can be changed.

[0060] For those of ordinary skill in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions, and variations made to the embodiments still fall within the protection scope of the present invention.

Claims

1. An automatic pretreatment device for food heavy metal detection samples, comprising a mounting base (1), wherein a loading device (2) and a detection table (4) are arranged at positions close to the edge on the mounting base (1), and it is characterized in that: A tube-taking device (3) is rotatably arranged at the central position of the mounting base (1). Along the rotation direction of the tube-taking device (3) on the mounting base (1), a feeding station, a feeding station, an inspection station and a discharging station are sequentially arranged. The tube-taking device (3) includes a mounting column (301) fixedly connected to the center of the mounting base (1). A rotating seat (302) is rotatably mounted on the mounting column (301). At positions corresponding to each station on the outer side wall of the rotating seat (302), a first sliding arm (304) is slidably mounted. One end of the first sliding arm (304) away from the rotating seat (302) is rotatably mounted with an annular shell (307), and a clamping assembly (308) is arranged inside the annular shell (307).

2. The automatic pretreatment device for food heavy metal detection samples according to claim 1, characterized in that: A sliding assembly is arranged on the first sliding arm (304). The first sliding arm (304) is slidably mounted on the rotating seat (302) through the sliding assembly. A sliding driving assembly (313) is drivingly connected to the sliding assembly for driving the first sliding arm (304) to move up and down.

3. An automatic pretreatment device for food heavy metal detection samples according to claim 2, characterized in that: The material loading device (2) includes a first material loading table (201) and a second material loading table (202) rotatably mounted on the mounting base (1). A plurality of placing grooves (204) are formed on the upper surfaces of the first material loading table (201) and the second material loading table (202). A reagent tube (7) is placed in each placing groove (204). A material loading driving assembly (205) is fixedly mounted at the bottom of the mounting base (1), and the power output end of the material loading driving assembly (205) is drivingly connected to the first material loading table (201) and the second material loading table (202).

4. An automatic pre-treatment device for food heavy metal detection samples according to claim 3, characterized in that: The inspection table (4) is fixedly mounted at a position corresponding to the inspection station on the mounting base (1). A placing groove (204) is also formed at the central position of the inspection table (4). Sealing devices (203) are fixedly mounted at the tops of the placing grooves (204) of the second material loading table (202) and the inspection table (4). A sealing plate (8) is fixedly connected to the reagent tube (7) at a position corresponding to the sealing device (203). A vacuum adsorption device (207) is further arranged at the bottom of the placing grooves (204) of the second material loading table (202) and the inspection table (4).

5. An automatic pretreatment device for food heavy metal detection samples according to claim 4, characterized in that: A ejector rod (318) is slidably mounted inside the mounting column (301). The lower end of the ejector rod (318) is fixedly connected to a push rod assembly (319). The upper end of the ejector rod (318) is fixedly connected to a top plate (311). A support plate (312) is fixedly connected to the outer side of the top plate (311) along the circumferential direction at positions corresponding to each station. A reagent kit (314) is fixedly mounted on the support plate (312) corresponding to the feeding station. A quantitative filling assembly (315) is fixedly mounted at the central position of the bottom of the reagent kit (314).

6. An automatic pre-treatment device for food heavy metal detection samples according to claim 5, characterized in that: The clamping assembly (308) comprises a clamping plate (3081), wherein a plurality of clamping plates (3081) are evenly spaced apart along the circumferential direction of the annular shell (307), a clamping rod (3082) is fixedly connected to one side of the clamping plate (3081) away from the center of the annular shell (307), the clamping rod (3082) penetrates the outer surface of the annular shell (307), a second spring (3083) is sleeved on the clamping rod (3082), and two ends of the second spring (3083) are respectively fixedly connected to the clamping plate (3081) and the annular shell (307), the shape of the upper end of the clamping plate (3081) is adapted to the outer shape of the reagent tube (7), and the lower end of the clamping plate (3081) is inclined in a direction away from the center of the annular shell (307).

7. An automatic pretreatment device for food heavy metal detection samples according to claim 6, characterized in that: A tube-taking drive assembly (317) is fixedly mounted on the mounting base (1); the tube-taking drive assembly (317) is drivingly connected to the rotating seat (302) and is used to drive the rotating seat (302) to rotate.

8. An automatic pretreatment device for food heavy metal detection samples according to claim 7, characterized in that: The annular shell (307) is rotatably mounted on the first sliding arm (304), and a hybrid drive assembly (309) is also fixedly connected to the first sliding arm (304). The hybrid drive assembly (309) is transmission-connected to the annular shell (307) for driving the annular shell (307) to rotate.

9. An automatic pre-treatment device for food heavy metal detection samples according to claim 8, characterized in that: An alignment detection device (5) is also provided, and is used to detect whether the first sliding arm (304) and the support plate (312), and the first sliding arm (304) and the placement slot (204) are aligned. The alignment detection device (5) is signal-connected to a control device (6).

10. An automatic preprocessing method for food heavy metal detection samples, based on the automatic preprocessing equipment for food heavy metal detection samples described in claim 9, characterized in that, The following steps are involved: S1: placing a batch of reagent tubes (7) containing samples to be tested into the placement slot (204) of the first loading platform (201), starting the tube removal drive assembly (317), driving the rotating seat (302) to rotate, and aligning the first clamping assembly (308) with the first reagent tube (7) on the first loading platform (201); S2: the alignment detection device (5) detects the signal change and transmits the signal to the control device (6), and the control device (6) controls the sliding drive assembly (313) corresponding to the loading station to move, driving the first sliding arm (304) to move downward, thereby completing the clamping of the reagent tube (7); S3: the control device (6) controls the sliding drive assembly (313) to move in the reverse direction, and the first sliding arm (304) moves upward, driving the first reagent tube (7) to leave the placement slot (204); S4: The tube taking drive assembly (317) drives the rotating seat (302) to rotate, and the first reagent tube (7) is moved to the feeding station. The push rod assembly (319) is actuated to adjust the height of the quantitative filling assembly (315) to perform quantitative filling of the reagent. At the same time, the loading drive assembly (205) is started to drive the first loading platform (201) to rotate, and the second clamping assembly (308) is aligned with the second reagent tube (7) on the first loading platform (201). The above steps S1-S3 are repeated to take the second reagent tube (7) out of the placement slot (204); S5: The hybrid drive component (309) operates to drive the rotation of the annular shell (307), and further drives the rotation of the reagent tube (7) clamped by the clamping component (308), so that the reagent in the reagent tube (7) is fully mixed with the sample to be tested; S6: The rotating base (302) rotates to move the first reagent tube (7) to the detection station. Accordingly, the sliding drive component (313) operates to drive the first sliding arm (304) to move downward, and send the reagent tube (7) into the placement groove (204) of the detection table (4). At the same time, the second reagent tube (7) is moved to the feeding station for quantitative filling of the reagent; S7: The vacuum adsorption device (207) below the detection table (4) is started to fixedly adsorb the first reagent tube (7) in the placement groove (204). The sliding drive component (313) operates in the reverse direction, and the first sliding arm (304) moves upward and returns to its original position, and the first reagent tube (7) disengages from the clamping component (308); S8: The peripheral detection device is started to detect the sample in the reagent tube (7) on the detection table (4), and the detection result is output; S9: After the detection is completed, the clamping component (308) cooperates with the vacuum adsorption device (207) at the bottom of the second loading table (202) to transfer the reagent tube (7) on the detection table (4) to the second loading table (202), and the worker batch-removes the tested samples.

Images