Automatic pretreatment equipment and method for food heavy metal detection samples

Abstract

The present invention relates to the field of food safety detection technology, and in particular to an automatic pretreatment device for food heavy metal detection samples and a method thereof, wherein the automatic pretreatment device for food heavy metal detection samples comprises a mounting base, a loading device and a detection table are arranged at a position near the edge of the mounting base, a tube taking device is rotatably arranged at the center position of the mounting base, the tube taking device comprises a mounting column fixedly connected to the center of the mounting base, a rotating seat is rotatably mounted on the mounting column, a first sliding arm is slidably mounted at a position corresponding to each work station on the outer side wall of the rotating seat, an annular shell is rotatably mounted on the end of the first sliding arm away from the rotating seat, and a clamping assembly is arranged in the annular shell. The present invention can drive the reagent tube to automatically complete the filling and detection of the reagent, effectively improve the detection efficiency, and enhance the safety and accuracy of the detection.

Description

Technical Field

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

[0002] In the field of food processing, affected by 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 companies need to test the residual heavy metal content in food.

[0003] When conducting heavy metal content testing, 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, and sending the sample to be tested into the detection instrument for testing after sufficient chemical reaction. Since the reagents used in the pretreatment process are mostly strong acids, which are highly corrosive, manual operation is dangerous and can easily lead to deviations in the filling amount. Especially when faced with a large number of samples to be tested, the limitations of manual operation become increasingly prominent and cannot adapt to the large-scale and high-efficiency production rhythm of the modern food processing industry.

[0004] Based on the above reasons, the present invention provides an automatic pretreatment device and method for food heavy metal detection samples, which can be used in conjunction with different detection instruments to detect the heavy metal content in food, effectively improve detection efficiency, and enhance detection safety and accuracy. 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 clamping component clamps the reagent tube and drives the reagent tube to automatically and quantitatively add the reaction reagent, thereby realizing the automation of the sample pretreatment process, avoiding direct contact of workers with strong acid reagents, and also avoiding the filling amount deviation caused by manual operation, thereby improving the safety and accuracy of the detection.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A kind of automatic preprocessing equipment for food heavy metal detection samples includes a mounting base, and a loading device and a detection platform are arranged near the edge of the mounting base. The characteristic is that: a tube taking device is rotatably arranged at the center position of the mounting base, and a loading station, a feeding station, a detection station and a unloading station are arranged in sequence on the mounting base along the rotation direction of the tube taking device; the tube taking device includes a mounting column fixedly connected to the center of the mounting base, a rotating seat is rotatably mounted on the mounting column, and a first sliding arm is slidably mounted at a position corresponding to each station on the outer wall of the rotating seat, and an annular shell is rotatably mounted on the end of the first sliding arm away from the rotating seat, and a clamping assembly is arranged in the annular shell.

[0008] The following is a further optimization of the above technical solution by the present invention:

[0009] The first sliding arm is provided with a sliding assembly, and the first sliding arm is slidably mounted on the rotating seat through the sliding assembly. The sliding assembly is transmission-connected with a sliding drive assembly for driving the first sliding arm to move up and down.

[0010] Further optimization: the loading device includes a first loading platform and a second loading platform rotatably mounted on the mounting base, a plurality of placement grooves are provided on the upper surfaces of the first loading platform and the second loading platform, a reagent tube is placed in each placement groove, a loading drive assembly is fixedly mounted on the bottom of the mounting base, and the power output end of the loading drive assembly is transmission-connected to the first loading platform and the second loading platform.

[0011] Further optimization: the testing platform is fixedly installed on the mounting base at a position corresponding to the testing station. A placement slot is also provided at the center of the testing platform. A sealing device is fixedly installed on the top of the placement slot of the second loading platform and the testing platform. A sealing plate is fixedly connected to the position on the reagent tube corresponding to the sealing device. A vacuum adsorption device is also provided at the bottom of the placement slot of the second loading platform and the testing platform.

[0012] Further optimization: a push rod is slidably installed in the installation column, the lower end of the push rod is fixedly connected to the push rod assembly, the upper end of the push rod is fixedly connected to the top plate, and a support plate is fixedly connected to the outer side of the top plate at a position corresponding to each workstation along the circumferential direction, a reagent kit is fixedly installed on the support plate corresponding to the feeding station, and a quantitative filling assembly is fixedly installed at the center position of the bottom of the reagent kit.

[0013] Further optimization: the clamping assembly includes a clamping plate, and several 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 passes 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 respectively fixedly connected to the clamping plate and the annular shell. The shape of the upper end of the clamping plate is adapted to the shape of the reagent tube, and the lower end of the clamping plate is inclined in the direction away from the center of the annular shell.

[0014] Further optimization: A tube-taking drive assembly is fixedly installed on the mounting base, and the tube-taking drive assembly is transmission-connected to the rotating seat for driving the rotating seat to rotate.

[0015] Further optimization: the annular shell is rotatably mounted on the first sliding arm, and the first sliding arm is also fixedly connected with a hybrid drive assembly, which is transmission-connected to the annular shell for driving the annular shell to rotate.

[0016] Further optimization: an alignment detection device is also provided, which 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 a control device.

[0017] Further optimization: A method for automatically preprocessing food heavy metal detection samples, based on the above-mentioned automatic preprocessing equipment for food heavy metal detection samples, comprises the following steps:

[0018] S1: Place the reagent tubes containing the samples to be tested in batches into the placement slots of the first loading platform, start the tube removal drive assembly, drive the rotating seat to rotate, and align the first clamping assembly with the first reagent tube on the first loading platform;

[0019] S2: The alignment detection device detects the signal change and transmits the signal to the control device. The control device controls the sliding drive assembly corresponding to the loading station to move the first sliding arm downward to complete the clamping of the reagent tube;

[0020] 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;

[0021] S4: The tube removal drive assembly drives the rotating seat to rotate, and the first reagent tube is moved to the feeding station. The push rod assembly adjusts the height of the quantitative filling assembly to perform quantitative filling of the reagent. At the same time, the loading drive assembly is started to drive the first loading platform to rotate. The second clamping assembly is aligned with the second reagent tube on the first loading platform. Repeat the above SS steps to remove the second reagent tube from the placement tank;

[0022] S5: The mixing drive assembly drives the annular housing to rotate, which in turn 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;

[0023] S6: The rotating seat rotates to move the first reagent tube to the detection station. The corresponding sliding drive assembly moves, driving 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 addition of reagent;

[0024] S7: The vacuum adsorption device under the testing table is started 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 released from the clamping assembly;

[0025] S8: Start the peripheral detection device to detect the sample in the reagent tube on the detection table and output the detection result;

[0026] 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.

[0027] The present invention adopts the above technical solution and has the following beneficial effects:

[0028] The present invention drives the reagent tube to circulate on the equipment through the clamping assembly provided on the tube removal device, automatically fills the reaction reagent, realizes the automatic pretreatment of the test sample during the food heavy metal detection process, avoids workers from direct contact with strong acid reagents, and improves the safety of the pretreatment process.

[0029] The present invention provides a quantitative filling component at the bottom of the reagent kit, and accurately fills the relevant reagents into the reagent tube according to needs, avoiding the filling amount deviation caused by manual operation and improving the accuracy of the detection result.

[0030] The first loading platform and the second loading platform of the present invention are provided with a plurality of storage slots, which can be used to place reagent tubes in batches, thereby reducing the operation frequency of workers and improving work efficiency.

[0031] A push rod device is provided under the push rod of the present invention to push the push rod up and down and adjust the height position of the feeding device so that the filling port of the quantitative filling component is inserted into the inside of the reagent tube, so as to be suitable for accurate filling of reagent tubes of different heights.

[0032] The present invention will be further described below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a three-dimensional diagram of the overall structure of Example 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of the overall internal structure of Example 1 of the present invention;

[0035] Figure 3 This is a front view of the loading device of Example 1 of the present invention;

[0036] Figure 4 is a perspective view of a loading device according to embodiment 1 of the present invention;

[0037] Figure 5 yes Figure 3 Enlarged view of point A in the middle;

[0038] Figure 6 This is a front view of the pipe extraction device according to embodiment 1 of the present invention;

[0039] Figure 7 is a perspective view of a pipe extraction device according to embodiment 1 of the present invention;

[0040] Figure 8 This is a front view of the clamping assembly of Example 1 of the present invention;

[0041] Figure 9 is a top view of the clamping assembly of Example 1 of the present invention;

[0042] Figure 10 This is a schematic diagram of the internal structure of the sliding assembly of Example 2 of the present invention;

[0043] Figure 11 It is a schematic diagram of the internal structure of the sliding assembly of Example 3 of the present invention.

[0044] In the figure: 1. Mounting base; 2. Loading device; 201. First loading platform; 202. Second loading platform; 203. Sealing device; 204. Placement slot; 205. Loading drive assembly; 206. Loading transmission assembly; 207. Vacuum adsorption device; 208. Connecting shaft; 3. Tube removal device; 301. Mounting column; 302. Rotating seat; 303. First sliding groove; 304. First sliding arm; 305. Sliding rod; 306. First spring; 307. Annular shell; 308. Clamping assembly; 3081. Clamping plate; 3082. Clamp Tightening rod; 3083, second spring; 309, hybrid drive assembly; 310, hybrid transmission assembly; 311, top plate; 312, support plate; 313, sliding drive assembly; 314, reagent box; 315, quantitative filling assembly; 316, tube removal transmission assembly; 317, tube removal drive assembly; 318, top rod; 319, push rod assembly; 320, second sliding groove; 321, second sliding arm; 322, third spring; 323, screw; 4, detection table; 5, alignment detection device; 6, control device; 7, reagent tube; 8, sealing plate. DETAILED DESCRIPTION

[0045] Example 1: Figure 1-2 As shown, an automatic pretreatment equipment for food heavy metal detection samples includes a mounting base 1, which is a cylindrical structure with a hollow interior. A loading device 2 and a detection platform 4 are provided near the edge of the mounting base 1, and a tube removal device 3 is rotatably provided at the center of the mounting base 1. A loading station, a feeding station, a detection station and a unloading station are sequentially provided on the mounting base 1 along the rotation direction of the tube removal device 3. The number of feeding stations can be increased or decreased according to the number of types of reagents required to be added.

[0046] The loading device 2 includes a first loading platform 201 and a second loading platform 202 rotatably mounted on the mounting base 1. The first loading platform 201 and the second loading platform 202 correspond to the positions of the loading station and the unloading station respectively. A connecting shaft 208 is fixedly connected to the bottom of the first loading platform 201 and the second loading platform 202, and the connecting shaft 208 is rotatably mounted on the mounting base 1.

[0047] like Figure 3-4 As shown, the upper surfaces of the first loading platform 201 and the second loading platform 202 are provided with placement grooves 204 along their circumferential directions, and the multiple placement grooves 204 are evenly spaced apart. A reagent tube 7 is placed in each placement groove 204, and the reagent tube 7 is used to hold the sample to be tested. The shape of the placement groove 204 is adapted to the shape of the reagent tube 7, and the reagent tubes 7 can be placed in batches for operation, thereby reducing the frequency of workers' operations and reducing labor intensity.

[0048] A loading drive assembly 205 is fixedly installed at the bottom of the mounting base 1, and the power output end of the loading drive assembly 205 is fixedly connected to the loading transmission assembly 206. The end of the loading transmission assembly 206 away from the loading drive assembly 205 is fixedly connected to the lower end of the connecting shaft 208. When the loading drive assembly 205 is in motion, the loading transmission assembly 206 drives the first loading platform 201 and the second loading platform 202 to rotate, so that the reagent tube 7 in each placement slot 204 can be taken out or put in by the tube removal device 3.

[0049] In this embodiment, the loading drive component 205 is configured 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 passive gear fixedly connected to the lower end of the connecting shaft 208. The driving gear and the passive gear are meshed and connected. A servo motor drives the driving gear to rotate, and then drives the first loading platform 201 and the second loading platform 202 to rotate synchronously in opposite directions through the passive gear and the connecting shaft 208.

[0050] In addition to this embodiment, a transition gear can be added to the transmission gear set so that the first loading platform 201 and the second loading platform 202 rotate synchronously in the same direction, or a servo motor can be added. The two servo motors are used to drive the first loading platform 201 and the second loading platform 202 to rotate in the required direction respectively.

[0051] In addition to this embodiment, the loading drive component 205 can also use a hydraulic motor or a pneumatic motor, and the loading transmission component 206 can also use a belt and pulley combination or a chain sprocket combination. The loading drive component 205 outputs rotational power and drives the first loading platform 201 and the second loading platform 202 to rotate through the loading transmission component 206.

[0052] The detection table 4 is fixedly installed on the mounting base 1 at a position corresponding to the detection station. A placement groove 204 is also provided at the center of the detection table 4. The tube removal device 3 clamps the reagent tube 7 and places it in the placement groove 204 of the detection table 4, and cooperates with the external detection device to detect the heavy metal content in the sample.

[0053] 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, and the light source emits characteristic spectral lines corresponding to the element to be measured. When the characteristic light passes through the ground-state atomic vapor, the ground-state atoms of the target element selectively absorb the light of the corresponding wavelength, resulting in attenuation of the light intensity. Non-target elements do not absorb the light of this wavelength and do not interfere with the detection, thereby detecting the content of one or more heavy metals in the sample.

[0054] In addition to this embodiment, according to different detection items, the detection table 4 can also be connected to other detection instruments to detect the pretreated samples. The above detection instruments are all commonly used detection equipment in the prior art and will not be described in detail in the present invention.

[0055] like Figure 3 and Figure 5 As shown, a sealing device 203 is fixedly installed on the top of the placement groove 204 of the second loading platform 202 and the detection platform 4, and a sealing plate 8 is fixedly connected to the position corresponding to the sealing device 203 on the reagent tube 7. When the reagent tube 7 is placed in the placement groove 204 of the second loading platform 202 and the detection platform 4, the sealing plate 8 contacts the sealing device 203 to form a seal.

[0056] 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 platform 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, and adsorb the reagent tube 7 in the placement groove 204.

[0057] 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, O-ring and sealing plate 8 cooperate with each other to make the placement groove 204 in a negative pressure state, ensuring that the reagent tube 7 is firmly adsorbed in the placement groove 204.

[0058] like Figure 6-7As shown, the pipe removal device 3 includes a mounting column 301 fixedly connected to the center of the mounting base 1, and 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 work station on the outer wall of the rotating seat 302. The first sliding grooves 303 are arranged along the up and down directions of the rotating seat 302. A first sliding arm 304 is installed in each first sliding groove 303. An annular shell 307 is provided at the end of the first sliding arm 304 away from the rotating seat 302, and a clamping assembly 308 is provided in the annular shell 307.

[0059] A sliding assembly is provided on the first sliding arm 304, and the tube removal device 3 is also provided with a sliding drive assembly 313. When the sliding drive assembly 313 is actuated, the first sliding arm 304 is driven to slide in the first sliding groove 303 in the up and down directions through the sliding assembly, thereby driving the clamping assembly 308 to clamp the reagent tube 7, thereby completing the operation of taking and placing the reagent tube 7.

[0060] A through hole is provided inside the mounting column 301, in which a push rod 318 is slidably installed, and the upper end of the push rod 318 is fixedly connected to a top plate 311, and a support plate 312 is fixedly connected to the outer side of the top plate 311 at a position corresponding to each work station along the circumferential direction, and a reagent reagent 314 is fixedly installed on the support plate 312 corresponding to the feeding station, for holding the reagent that needs to be added, and the position of the reagent reagent 314 corresponds to the position of the annular shell 307 on the first sliding arm 304, and a quantitative filling component 315 is fixedly installed at the center position of the bottom of the reagent reagent 314, for adding a quantitative reagent to the reagent tube 7 according to the set value.

[0061] In this embodiment, the quantitative filling component 315 is a plunger-type quantitative pump, which controls the volume of liquid discharged each time by adjusting the stroke of the reciprocating motion of the plunger in the cylinder, and is used to add a quantitative amount of reagent into the reagent tube 7, which can not only allow the reagent to fully react with the test sample, but also avoid waste caused by excessive filling.

[0062] In addition to this embodiment, the quantitative filling component 315 can adopt a flow meter in combination with a solenoid valve. When the outflowing liquid reaches the set value, the solenoid valve is controlled to close the liquid outflow port to achieve quantitative filling, or other filling devices in the existing technology that can accurately control the liquid flow rate can be used, so that the sample preparation reagent can be accurately filled according to the set value.

[0063] The bottom end of the push rod 318 is fixedly connected to the push rod assembly 319, and the fixed end of the push rod assembly 319 is fixedly mounted on the mounting base 1. The telescopic end of the push rod assembly 319 is fixedly connected to the bottom end of the push rod 318. In this embodiment, the push rod assembly 319 can be selected from a servo electric cylinder, a servo air cylinder or a servo hydraulic cylinder. The telescopic end of the push rod assembly 319 extends or retracts, driving the push rod 318 and the top plate 311 to move up and down, and then 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 inside of the reagent tube 7, so as to be suitable for precise filling of reagent tubes 7 of different heights.

[0064] In this embodiment, the sliding assembly includes a sliding rod 305, which is fixedly connected to the upper and lower ends of the first sliding groove 303, and the first sliding arm 304 is sleeved on the outside of the sliding rod 305. The sliding rod 305 is used to prevent the first sliding arm 304 from escaping from the first sliding groove 303, and to guide the movement of the first sliding arm 304. A first spring 306 is also provided in the first sliding groove 303, and the first spring 306 is sleeved on the outside of the sliding rod 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 top of the first sliding groove 303 under the action of the first spring 306.

[0065] In this embodiment, the sliding drive component 313 can be 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 extends 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 out of the placement groove 204.

[0066] like Figure 8-9 As shown, the clamping assembly 308 includes a clamping plate 3081, and several 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 passes through 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.

[0067] 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 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 a flared lower end. The diameter of the upper end of this cavity is smaller than the outer diameter of the reagent tube 7, and 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.

[0068] 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 the 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 out of the placement slot 204.

[0069] Furthermore, the annular shell 307 is rotatably mounted on the first sliding arm 304, and one end of the mixing transmission component 310 is fixedly connected to the outer side of the annular shell 307, and the other end of the mixing transmission component 310 is fixedly connected to the mixing drive component 309. The mixing drive component 309 outputs rotational power, which drives the annular shell 307 to rotate through the mixing transmission component 310, and then drives the reagent tube 7 clamped by the clamping component 308 to rotate. The mixing drive 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.

[0070] In this embodiment, the hybrid drive component 309 is a micro motor, and the hybrid transmission component 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 passive gear is fixedly connected to the outside of the annular shell 307 to ensure that the clamping component 308 will not interfere with the passive gear when clamping the reagent tube 7.

[0071] In addition to this embodiment, the hybrid drive component 309 can also be a hydraulic motor or a pneumatic motor. The hybrid drive component 309 outputs rotational power and drives the annular shell 307 to rotate through the hybrid transmission component 310, so that the reagent and the sample to be tested can be fully mixed.

[0072] like Figure 6As shown, a tube-picking drive assembly 317 is fixedly mounted on the mounting base 1 , a power output end of the tube-picking drive assembly 317 is fixedly connected to a tube-picking transmission assembly 316 , and one end of the tube-picking transmission assembly 316 away from the tube-picking drive assembly 317 is fixedly connected to the bottom of the rotating seat 302 .

[0073] In this embodiment, the tube removal drive assembly 317 is a servo motor, and the tube removal transmission 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 passive gear fixedly connected under the rotating seat 302. The driving gear and the passive gear are meshed and connected. The servo motor drives the driving gear to rotate, and then drives the rotating seat 302 to rotate through the passive gear, so that the reagent tube 7 can be transferred between various workstations.

[0074] In addition to this embodiment, the tube-taking drive component 317 can also use a hydraulic motor or a pneumatic motor, and the tube-taking transmission component 316 can also use a belt and pulley combination or a chain sprocket combination. The tube-taking drive component 317 outputs rotational power, and drives the rotating seat 302 to rotate through the tube-taking transmission component 316, thereby driving the reagent tube 7 to complete the transfer between various workstations.

[0075] 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 slot 204, it transmits the signal to the control device 6, and the control device 6 controls the action of related components.

[0076] In this embodiment, the alignment detection device 5 is a photoelectric sensor and is provided in 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 slot 204, and are used to determine whether the first sliding arm 304 is aligned with the placement slot 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.

[0077] The present invention also provides a method for automatically preprocessing food samples for heavy metal detection, based on the above-mentioned automatic preprocessing device for food samples for heavy metal detection, comprising the following steps:

[0078] S1: Place the test tubes 7 containing the samples in batches into the placement slots 204 of the first loading platform 201, start the tube removal drive assembly 317, and drive the rotating base 302 to rotate, so that the first clamping assembly 308 is aligned with the first test tube 7 on the first loading platform 201;

[0079] S2: The alignment detection device 5 detects the signal change and transmits the signal to the control device 6. 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;

[0080] 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;

[0081] S4: The tube removal drive assembly 317 drives the rotating seat 302 to rotate, and the first reagent tube 7 is moved to the loading 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 activated to drive the first loading platform 201 to rotate. 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 remove the second reagent tube 7 from the placement slot 204.

[0082] S5: The mixing drive assembly 309 is actuated to rotate the annular housing 307, thereby rotating the reagent tube 7 clamped by the clamping assembly 308, so that the reagent in the reagent tube 7 is fully mixed with the sample to be tested;

[0083] S6: The rotating seat 302 rotates to move the first reagent tube 7 to the detection station. The corresponding sliding drive assembly 313 is actuated to drive the first sliding arm 304 downward to deliver the reagent tube 7 to the placement slot 204 of the detection table 4. At the same time, the second reagent tube 7 is moved to the feeding station for quantitative addition of reagent.

[0084] S7: The vacuum adsorption device 207 below the detection table 4 is activated to fix the first reagent tube 7 in the placement groove 204. The sliding drive assembly 313 moves in the reverse direction, the first sliding arm 304 moves back to its original position, and the first reagent tube 7 is released from the clamping assembly 308.

[0085] S8: Start the external detection device to detect the sample in the reagent tube 7 on the detection table 4 and output the detection result;

[0086] S9: After the test is completed, the clamping assembly 308 cooperates with the vacuum adsorption device 207 at the bottom of the second loading platform 202 to transfer the reagent tube 7 on the test platform 4 to the second loading platform 202, and the workers remove the samples that have been tested in batches.

[0087] Example 2: An automatic preprocessing device for food heavy metal detection samples based on the above-mentioned Example 1. The difference between Example 2 and Example 1 is that a second sliding groove 320 is provided on the bottom surface of the first sliding arm 304 at one end close to the rotating seat 302, and 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, and 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 also provided in the second sliding groove 320, and 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.

[0088] The telescopic end of the sliding drive assembly 313 extends out, pushing 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 in the second sliding groove 320 toward the end away from the rotating seat 302, and the third spring 322 is compressed; the telescopic end of the sliding drive assembly 313 retracts, and under the action of the third spring 322, pushes the upper end of the second sliding arm 321 to move in the opposite direction, thereby pushing the first sliding arm 304 back to its original position, thereby realizing the up and down movement of the first sliding arm 304 and completing the taking and placing operation of the reagent tube 7.

[0089] Example 3: An automatic pretreatment device for food heavy metal detection samples based on the above-mentioned Example 1. The difference between Example 3 and Example 1 is that the sliding component is a screw rod 323 arranged in the first sliding groove 303 along the up and down directions, and the upper and lower ends of the screw rod 323 are rotatably connected to the upper and lower ends of the first sliding groove 303. An external thread is provided on the screw rod 323, and a threaded hole is opened at a position corresponding to the screw rod 323 on the first sliding arm 304, and the first sliding arm 304 is threadedly connected to the screw rod 323.

[0090] The sliding drive assembly 313 is a micro motor fixedly connected to the upper end of the screw rod 323. The micro motor drives the screw rod 323 to rotate, thereby driving the first sliding arm 304 to move up and down. By changing the rotation direction of the micro motor, the movement direction of the first sliding arm 304 can be changed.

[0091] For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. An automatic pretreatment device for food heavy metal detection samples, comprising a mounting base (1), a loading device (2) and a detection table (4) being provided near the edge of the mounting base (1), characterized in that: A pipe removal device (3) is rotatably provided at the center of the mounting base (1), and a loading station, a feeding station, a testing station, and a unloading station are sequentially provided on the mounting base (1) along the rotation direction of the pipe removal device (3); The pipe removal 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 arm (304) is slidably mounted at a position corresponding to each work station on the outer wall of the rotating seat (302), an annular shell (307) is rotatably mounted on one end of the first sliding arm (304) away from the rotating seat (302), and a clamping assembly (308) is provided in the annular shell (307); A sliding assembly is provided on the first sliding arm (304), and the first sliding arm (304) is slidably mounted on the rotating seat (302) through the sliding assembly. A sliding drive assembly (313) is transmission-connected to the sliding assembly for driving the first sliding arm (304) to move up and down.

2. The automatic pretreatment equipment for food heavy metal detection samples according to claim 1, characterized in that: The loading device (2) comprises a first loading platform (201) and a second loading platform (202) rotatably mounted on a mounting base (1); a plurality of placement grooves (204) are provided on the upper surfaces of the first loading platform (201) and the second loading platform (202); a reagent tube (7) is placed in each placement groove (204); a loading drive assembly (205) is fixedly mounted on the bottom of the mounting base (1); a power output end of the loading drive assembly (205) is transmission-connected to the first loading platform (201) and the second loading platform (202).

3. The automatic pretreatment equipment for food heavy metal detection samples according to claim 2, characterized in that: The detection table (4) is fixedly mounted on the mounting base (1) at a position corresponding to the detection station. A placement groove (204) is also provided at the center of the detection table (4). A sealing device (203) is fixedly mounted on the top of the placement groove (204) of the second loading table (202) and the detection table (4). A sealing plate (8) is fixedly connected to a position on the reagent tube (7) corresponding to the sealing device (203). A vacuum adsorption device (207) is also provided at the bottom of the placement groove (204) of the second loading table (202) and the detection table (4).

4. The automatic pretreatment equipment for food heavy metal detection samples according to claim 3, characterized in that: A push rod (318) is slidably installed in the installation column (301), the lower end of the push rod (318) is fixedly connected to a push rod assembly (319), the upper end of the push 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) at a position corresponding to each work station along the circumferential direction, a reagent box (314) is fixedly installed on the support plate (312) corresponding to the feeding station, and a quantitative filling assembly (315) is fixedly installed at the center position of the bottom of the reagent box (314).

5. The automatic pretreatment equipment for food heavy metal detection samples according to claim 4, characterized in that: 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) passes through the outer surface of the annular shell (307). A second spring (3083) is sleeved on the clamping rod (3082). The two ends of the second spring (3083) are fixedly connected to the clamping plate (3081) and the annular shell (307), respectively. 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).

6. The automatic pretreatment equipment for food heavy metal detection samples according to claim 5, characterized in that: A tube-taking drive assembly (317) is fixedly mounted on the mounting base (1). The tube-taking drive assembly (317) is in transmission connection with the rotating base (302) and is used to drive the rotating base (302) to rotate.

7. The automatic pretreatment equipment for food heavy metal detection samples according to claim 6, characterized in that: The annular shell (307) is rotatably mounted on the first sliding arm (304). The first sliding arm (304) is also fixedly connected with a hybrid drive assembly (309). The hybrid drive assembly (309) is transmission-connected to the annular shell (307) for driving the annular shell (307) to rotate.

8. The automatic pretreatment equipment for food heavy metal detection samples according to claim 7, 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).

9. A method for automatically preprocessing food samples for heavy metal detection, based on the automatic preprocessing device for food samples for heavy metal detection according to claim 8, characterized in that: The following steps are involved: S1: placing the reagent tubes (7) containing the samples to be tested in batches 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, so that the first clamping assembly (308) is aligned 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 removal 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) adjusts 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. The second clamping assembly (308) is aligned with the second reagent tube (7) on the first loading platform (201). Repeat the above steps S1-S3 to remove the second reagent tube (7) from the placement slot (204); S5: The mixing drive assembly (309) drives 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, and the corresponding sliding drive assembly (313) moves to drive the first sliding arm (304) to move downward, and the reagent tube (7) is sent to the placement slot (204) of the detection table (4). At the same time, the second reagent tube (7) is moved to the feeding station for quantitative addition of the reagent; S7: Start the vacuum adsorption device (207) below the detection table (4), fix the first reagent tube (7) in the placement groove (204), and the sliding drive component (313) moves in the reverse direction, the first sliding arm (304) moves back to its original position, and the first reagent tube (7) is separated from the clamping component (308); S8: Start the external detection device to detect the sample in the reagent tube (7) on the detection table (4) and output the detection result; S9: After the test is completed, the clamping assembly (308) cooperates with the vacuum adsorption device (207) at the bottom of the second loading platform (202) to transfer the reagent tube (7) on the test platform (4) to the second loading platform (202), and the workers remove the batches of samples that have been tested.

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