A sampling device and method for food safety detection

Abstract

The present invention relates to the field of food testing equipment, and in particular to a sampling device and method for food safety testing. The sampling device comprises a sampling barrel, on which at least three coaxially arranged sampling tubes are arranged, and the sampling tubes are connected by coaxially arranged connecting tubes. A suction tube is arranged at the bottom end of each sampling tube, and a discharge tube is arranged at the top end. A first piston and a second piston are arranged in each sampling barrel, and all the first pistons are connected by a vertical first connecting rod, and all the second pistons are connected by a vertical second connecting rod. A horizontal support frame plate is arranged on the top of the sampling barrel. The sampling tube in the technical solution can synchronously collect thick food at different positions in a storage tank, and the movement of the first piston and the second piston can realize the function of the sample entering the sampling tube and being discharged from the sampling tube, and injecting clean water into the discharge tube and then discharging it through the suction tube to flush the residue inside the sampling tube.

Description

Technical Field

[0001] The present invention relates to the field of food testing equipment, and in particular to a sampling device and method for food safety testing. Background Art

[0002] Food safety testing is to detect harmful substances in food according to national indicators, mainly some harmful and toxic indicators, such as heavy metals, aflatoxin, etc. An important aspect of food science and engineering is to introduce and apply chemical unit operations and develop food engineering unit operations, thereby promoting the development of the food industry in the direction of large-scale, continuous and automated production. The sampling device is one of the devices used in food safety testing.

[0003] There are many kinds of existing food, including solid food, liquid food, granular food, solid food containing juice, etc. When testing thick semi-solid food, it is usually necessary to use a sampling device to sample the upper layer, middle layer and lower layer in the package separately, and then mix and take the average sample reduced to the required number. Using the existing sampling device to suck the thick food requires multiple suctions, which affects the sampling efficiency. In addition, the thick food is easy to adhere to the inner wall of the sampling device, which is difficult to clean, affecting the subsequent sampling. Summary of the invention

[0004] In view of the above problems, it is necessary to provide a sampling device and method for food safety testing to address the problems of the prior art.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A sampling device for food safety detection comprises a sampling barrel, wherein at least three coaxially arranged sampling tubes are arranged on the sampling barrel, and the sampling tubes are connected by coaxially arranged connecting tubes. A suction tube extending radially along the sampling tube is arranged at the bottom end of each sampling tube, and a discharge tube extending radially along the sampling tube is arranged at the top end of each sampling tube; a first piston and a second piston are arranged in each sampling barrel, and all the first pistons are connected by a vertical first connecting rod, and all the second pistons are connected by a vertical second connecting rod. Through holes with the same cross-sectional shapes as the second connecting rod and the first connecting rod are respectively arranged on the first piston and the second piston, the first connecting rod is inserted in the through hole of the second piston, and the second connecting rod is inserted in the through hole of the first piston, and the first connecting rod and the second connecting rod are inserted in the connecting tube and extend to the top of the sampling barrel; a horizontal support frame plate is arranged on the top of the sampling barrel.

[0007] Preferably, the thickness of the first piston and the second piston is n, the inner diameter of the suction tube and the discharge tube is m; the straight-line distance between the suction tube and the bottom end of the sampling tube is greater than n; the straight-line distance between the discharge tube and the top end of the sampling tube is greater than m+n; an inner sealing piece is slidably installed in the sampling tube, the inner sealing piece is located inside the sampling tube to seal the discharge tube, and the length of the inner sealing piece is not less than m.

[0008] Preferably, the sampling tube is provided with a vertically extending waist-shaped hole on the upper side of the discharge pipe, the waist-shaped hole passes through the side wall of the sampling tube, and the waist-shaped hole is located in a limiting slide groove provided on the outer wall of the sampling tube; a guide rod extending radially along the sampling tube is provided on the top of the inner sealing piece, the diameter of the guide rod is the same as the width of the waist-shaped hole, the guide rod passes through the waist-shaped hole and extends to the outside of the sampling tube, the guide rod is fixedly connected to the outer sealing piece, the outer sealing piece is slidably installed in the limiting slide groove, and the length of the outer sealing piece is greater than the length of the waist-shaped hole.

[0009] Preferably, the inner sealing piece has an arc-shaped outer wall that fits the inside of the sampling tube; and the outer sealing piece has an arc-shaped inner wall that fits the outer wall of the sampling tube.

[0010] Preferably, the outside of the sampling tube is provided with an annular slide rail surrounding the outer wall of the sampling tube; two arc-shaped closed cover plates are slidably installed on the outside of the sampling tube, and the inner wall of the closed cover plate is provided with arc-shaped clips with the same number as the annular slide rails, and the closed cover plate is slidably installed on the annular slide rail through the arc-shaped clips; the suction pipe and the discharge pipe have the same length, and one end of the suction pipe and the discharge pipe located outside the sampling tube is provided with the same curvature as the inner wall of the closed cover plate; the straight-line distance between the top end of the suction pipe and the discharge pipe and the axis of the sampling tube is equal to the straight-line distance between the inner wall of the closed cover plate and the axis of the sampling tube, the closed cover plate extends along the axis direction of the sampling tube, and the length of the closed cover plate is greater than the sum of the lengths of the sampling tubes.

[0011] Preferably, the support frame plate includes an installation box horizontally installed on the top of the sampling tube, and two parallel extension rods are slidably installed in the installation box. Tooth grooves are provided on opposite sides of the two extension rods. A rotating gear is rotatably installed at the center of the support frame plate. The rotating gear is meshed with the tooth grooves on the extension rods on both sides, and a support block is fixedly installed at one end of each extension rod away from the rotating gear.

[0012] Preferably, a positioning sleeve is provided on the top of the mounting box of the support frame plate, and the first connecting rod and the second connecting rod are inserted in the positioning sleeve; the top of the first connecting rod and the second connecting rod are both provided with semicircular limiting plates, and when the limiting plate at the top of the first connecting rod fits against the top of the positioning sleeve, the bottom surface of the first piston is located above the suction tube, and when the limiting plate at the top of the second connecting rod fits against the top of the positioning sleeve, the second piston fits against the bottom of the sampling tube.

[0013] A sampling method for food safety detection is applied to a sampling device for food safety detection, comprising the following steps:

[0014] Step 1: Open the thick food to be sampled or place it in the sampling tube, place the support frame plate at the mouth of the sampling tube, and insert the sampling tube vertically into the sampling tube;

[0015] Step 2: After a period of rest, the staff pulls up the first connecting rod to move the first pistons in all the sampling tubes upward, and simultaneously extracts samples from the upper, middle and lower sections of the thick food;

[0016] Step 3: After the extraction is completed, take out the sampling tube, align the discharge tube of the sampling tube with the collecting tube, pull the second connecting rod, move the second pistons in all the sampling tubes toward the discharge tube, and squeeze the thick food inside the sampling tube out of the discharge tube;

[0017] Step 4: Evenly mix the obtained samples for testing.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] First, the sampling barrel in the present invention has at least three coaxially arranged sampling tubes, which can synchronously collect thick food at different positions in the storage tank to improve the collection efficiency. The sampling tube is provided with a suction tube and a discharge tube, and the sampling tube is provided with a first piston and a second piston. The sample can enter the sampling tube and be discharged from the sampling tube through the movement of the first piston and the second piston.

[0020] Secondly, the upper and lower ends of the sampling tube in the present invention are respectively provided with a suction pipe and a discharge pipe. The suction pipe can be blocked by a closing cover plate, and the discharge pipe can be blocked by an inner sealing piece and a closing cover plate. By changing the sealing state of the suction pipe and the discharge pipe, the sample can be sucked into the sampling tube and discharged outward, and clean water can be injected into the discharge pipe and then discharged through the suction pipe to flush the residue inside the sampling tube.

[0021] Thirdly, the two extension rods slidably installed in the mounting box of the support frame in the present invention can move radially along the sampling tube, thereby changing the length of the support frame according to the size of the container for storing thick food, so that the support block is supported on the edge of the container to keep the vertical state of the sampling tube stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a stereoscopic diagram of a sampling device for food safety testing in a first working state;

[0023] Figure 2 It is a three-dimensional structural exploded diagram of a sampling device for food safety testing;

[0024] Figure 3 yes Figure 2 A local enlarged view of point A;

[0025] Figure 4 It is a front view of a sampling device for food safety testing;

[0026] Figure 5 yes Figure 4 A cross-sectional view of the section at BB;

[0027] Figure 6 is a schematic diagram of a sampling device for food safety testing in a first working state;

[0028] Figure 7 It is a main view of a sampling device for food safety testing in a second working state;

[0029] Figure 8 yes Figure 7 A cross-sectional view of the section at CC;

[0030] Fig. 9 yes Figure 8 A partial enlarged view of point D.

[0031] The numbers in the figure are: 1. sampling cylinder; 11. sampling tube; 111. suction tube; 112. discharge tube; 113. waist-shaped hole; 114. limiting slide groove; 12. connecting tube; 13. first piston; 131. first connecting rod; 132. through hole; 14. second piston; 141. second connecting rod; 142. limiting plate; 15. inner sealing piece; 151. guide rod; 152. outer sealing piece; 16. annular slide rail; 17. closing cover plate; 171. arc-shaped card strip; 2. support frame plate; 21. installation box; 211. positioning sleeve; 22. extension rod; 221. tooth groove; 23. rotating gear; 24. support block. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figures 1 to 9 :

[0034] A sampling device for food safety detection comprises a sampling cylinder 1, wherein the sampling cylinder 1 has at least three coaxially arranged sampling tubes 11, the sampling tubes 11 are connected through coaxially arranged connecting tubes 12, the bottom end of each sampling tube 11 is provided with a suction tube 111 extending radially along the sampling tube 11, and the top end of each sampling tube 11 is provided with a discharge tube 112 extending radially along the sampling tube 11; each sampling cylinder 1 is provided with a first piston 13 and a second piston 14, and all the first pistons 13 are connected through a vertical first connecting rod 131, and all the first pistons 13 are connected to each other through a vertical first connecting rod 131. The second piston 14 is connected by a vertical second connecting rod 141, and the first piston 13 and the second piston 14 are respectively provided with a through hole 132 with the same cross-sectional shape as the second connecting rod 141 and the first connecting rod 131, the first connecting rod 131 is inserted in the through hole 132 of the second piston 14, the second connecting rod 141 is inserted in the through hole 132 of the first piston 13, the first connecting rod 131 and the second connecting rod 141 are inserted in the connecting pipe 12 and extend to the top of the sampling cylinder 1; a horizontal supporting frame plate 2 is provided on the top of the sampling cylinder 1.

[0035] The sampling device in the present application samples viscous food through a sampling tube 1. The sampling tube 1 has a plurality of sampling tubes 11 arranged vertically. When the staff horizontally places the support frame plate 2 at the opening of the container containing the food to be tested, the sampling tube 1 is vertically inserted into the food to be tested. The sampling tubes 11 are respectively located at the upper section, middle section and lower section of the food. A suction tube 111 is provided at the bottom of each sampling tube 11, and a movable first piston 13 is provided inside each sampling tube 11. When the first piston 13 moves upward inside the sampling tube 11, the negative pressure generated in the sampling tube 11 will extract the food to be tested. The material enters the sampling tube 11 through the suction tube 111, thereby completing the synchronous collection of different positions of the thick food and improving the collection efficiency. In order to enable the first pistons 13 in all the sampling tubes 11 to move simultaneously, the first pistons 13 in this embodiment are connected by a first connecting rod 131, and the first connecting rod 131 passes through the connecting tube 12 between the sampling tubes 11 and extends to the top of the sampling cylinder 1, so that the staff can pull the first connecting rod 131 to realize the movement of all the first pistons 13. When the first piston 13 moves upward from the bottom of the sampling tube 11, the discharge pipe 112 is located above the first piston 13. When the sample After the collection is completed, the staff takes out the sampling tube 1, and pulls the first connecting rod 131 to move the first piston 13 to the top of the discharge pipe 112, and pulls the second connecting rod 141 to move the second pistons 14 in all the sampling tubes 11 to the top of the suction pipe 111, so that the sample in the sampling tube 11 can be discharged outward through the discharge pipe 112 as the second piston 14 moves upward, so as to be mixed with the samples in other sampling tubes 11 for detection. In this embodiment, the first piston 13 and the second piston 14 are both provided with a through hole 132, so the second connecting rod 141 can pass through the through hole of the first piston 13 132, the first piston 13 can pass through the through hole 132 of the second piston 14 to realize the relative movement of the second piston 14 in the sampling tube 11 and the first piston 13 in each sampling tube 11. The sampling tube 11 in this embodiment is provided with a suction tube 111 and a discharge tube 112. Therefore, the staff can move the first piston 13 to the top of the discharge tube 112 and the second piston 14 to the bottom of the suction tube 111, thereby cleaning the sample residue attached to the inner wall of the sampling tube 11 by injecting water into the suction tube 111 and then discharging it through the discharge tube 112 to prevent affecting the subsequent detection results.

[0036] In order to ensure that the positions of the first piston 13 and the second piston 14 inside the sampling tube 11 can achieve a state where the suction tube 111 and the discharge tube 112 are individually connected or all connected to the outside, the following features are specifically set:

[0037] The thickness of the first piston 13 and the second piston 14 is n, and the inner diameters of the suction pipe 111 and the discharge pipe 112 are m; the straight-line distance between the suction pipe 111 and the bottom end of the sampling tube 11 is greater than n; the straight-line distance between the discharge pipe 112 and the top end of the sampling tube 11 is greater than m+n; an inner sealing piece 15 is slidably installed in the sampling tube 11, and the inner sealing piece 15 is located inside the sampling tube 11 to seal the discharge pipe 112, and the length of the inner sealing piece 15 is not less than m.

[0038] In this embodiment, the thickness of the first piston 13 and the second piston 14 is n, and the linear distance between the suction tube 111 and the bottom end of the sampling tube 11 is greater than n, so that the second piston 14 can fit the bottom of the sampling tube 11 and be located below the suction tube 111, which will not affect the sample entering the sampling tube 11 through the suction tube 111. The sample entering the sampling tube 11 is located between the first piston 13 and the second piston 14. When collecting samples, the first piston 13 should be located below the discharge tube 112. At this time, the inner sealing piece 15 inside the sampling tube 11 seals the inner opening of the discharge tube 112. The length of the inner sealing piece 15 is greater than the diameter m of the discharge tube 112, so that To ensure its sealing effect and prevent the sample from entering the space between the first piston 13 and the top of the sampling tube 11, when the sample in the sampling tube 11 needs to be discharged outward, the second piston 14 can move up to above the suction tube 111, and the first piston 13 moves up to above the discharge tube 112. Since the straight-line distance between the discharge tube 112 and the top of the sampling tube 11 is greater than m+n, the first piston 13 can push the inner sealing piece 15 up when it moves up, and both the inner sealing piece 15 and the first piston 13 can move to a position above the discharge tube 112, so that when the second piston 14 continues to move up, it will not affect the discharge of the sample in the sampling tube 11 through the discharge tube 112.

[0039] In order to solve the problem of how to realize the sliding installation of the inner sealing piece 15 inside the sampling tube 11 without affecting the movement of the first piston 13, the following features are specifically set:

[0040] The sampling tube 11 is provided with a vertically extending waist-shaped hole 113 on the upper side of the discharge tube 112. The waist-shaped hole 113 passes through the side wall of the sampling tube 11 and is located in a limiting slide groove 114 provided on the outer wall of the sampling tube 11 (such as Figure 2 As shown); a guide rod 151 extending radially along the sampling tube 11 is provided on the top of the inner sealing piece 15, and the diameter of the guide rod 151 is the same as the width of the waist-shaped hole 113. The guide rod 151 passes through the waist-shaped hole 113 and extends to the outside of the sampling tube 11. The guide rod 151 is fixedly connected to the outer sealing piece 152, and the outer sealing piece 152 is slidably installed in the limiting slide groove 114. The length of the outer sealing piece 152 is greater than the length of the waist-shaped hole 113.

[0041] The inner plugging piece 15 has an arc-shaped outer wall that fits the inside of the sampling tube 11 ; the outer plugging piece 152 has an arc-shaped inner wall that fits the outer wall of the sampling tube 11 .

[0042] The inner sealing piece 15 in this embodiment has the same curvature as the inner wall of the sampling tube 11, so when the inner sealing piece 15 fits the inner wall opening of the discharge tube 112, the discharge tube 112 can be sealed to prevent the thick food from entering the sampling tube 11 through the discharge tube 112. The inner sealing piece 15 is connected to the outer sealing piece 152 located outside the sampling tube 11 through the guide rod 151. The outer sealing piece 152 is slidably installed in the limiting slide groove 114. When the inner sealing piece 15 moves up to release the inner wall opening of the discharge tube 112, the inner sealing piece 15 When the waist-shaped hole 113 is opened, the guide rod 151 moves in the waist-shaped hole 113. Under normal conditions, the inner sealing piece 15 and the outer sealing piece 152 can respectively seal the inside and outside of the waist-shaped hole 113 to ensure that thick food does not enter the sampling tube 11 through the waist-shaped hole 113. The waist-shaped hole 113 cooperates with the limiting slide groove 114 to limit the movement of the inner sealing piece 15 to ensure that after the first piston 13 moves downward, the outer sealing piece 152 can automatically move down to the position of sealing the discharge pipe 112 under the action of gravity.

[0043] In order to solve the problem of how to keep the suction pipe 111 and the discharge pipe 112 completely blocked when taking out the sampling tube 1, the following features are specifically set:

[0044] An annular slide rail 16 surrounding the outer wall of the sampling tube 11 is arranged on the outside of the sampling tube 11; two arc-shaped closed cover plates 17 are slidably installed on the outside of the sampling tube 1, and the inner wall of the closed cover plate 17 is provided with arc-shaped clamping strips 171 with the same number as the annular slide rail 16, and the closed cover plate 17 is slidably installed on the annular slide rail 16 through the arc-shaped clamping strips 171; the suction pipe 111 and the discharge pipe 112 have the same length, and the ends of the suction pipe 111 and the discharge pipe 112 located outside the sampling tube 11 are provided with the same curvature as the inner wall of the closed cover plate 17; the straight-line distance between the top end of the suction pipe 111 and the discharge pipe 112 and the axis of the sampling tube 11 is equal to the straight-line distance between the inner wall of the closed cover plate 17 and the axis of the sampling tube 11, the closed cover plate 17 extends along the axis direction of the sampling tube 11, and the length of the closed cover plate 17 is greater than the sum of the lengths of the sampling tubes 11.

[0045] In this embodiment, an annular slide rail 16 is arranged outside the sampling tube 11, and the closed cover plate 17 is slidably mounted on the annular slide rail 16 through an arc-shaped clamping strip 171, so that the closed cover plate 17 can move around the outer wall of the sampling tube 11, and the inner wall of the closed cover plate 17 can fit the outer openings of the suction tube 111 and the discharge tube 112. Therefore, when collecting samples, the staff can move the closed cover plates 17 so that one of the closed cover plates 17 blocks the outer opening of the sampling tube 11, and the other closed cover plate 17 moves to a position where it is not blocked. The suction tube 111 will be blocked and the sample will be collected. After the collection is completed, the staff can move the closing cover 17 to block both the suction tube 111 and the discharge tube 112, so that the collected sample will not leak when the sampling tube 1 is taken out. The curvature of the closing cover 17 can make its central angle ninety degrees. Therefore, the closing cover 17 can be moved to a position where it neither blocks the suction tube 111 nor the discharge tube 112, thereby facilitating the staff to clean the inside of the sampling tube 11.

[0046] In order to solve the problem of how to support the support frame plate 2 on a container of any size for storing thick food, the following features are specifically provided:

[0047] The support frame plate 2 includes an installation box 21 horizontally installed on the top of the sampling tube 1. Two parallel extension rods 22 are slidably installed in the installation box 21. Tooth grooves 221 are provided on opposite sides of the two extension rods 22. A rotating gear 23 is rotatably installed at the center of the support frame plate 2. The rotating gear 23 is meshed and connected with the tooth grooves 221 on the extension rods 22 on both sides. A support block 24 is fixedly installed at one end of each extension rod 22 away from the rotating gear 23.

[0048] The support frame plate 2 in this embodiment includes a mounting box 21 installed on the top of the sampling tube 1. Two extension rods 22 slidably installed in the mounting box 21 can move radially along the sampling tube 1, so as to change the length of the support frame plate 2 according to the size of the container for storing thick food, so that the support frame plate 2 can support the sampling tube 1 on the container. The tooth grooves 221 on the extension rods 22 are all meshed and connected with the rotating gears 23 rotatably installed in the mounting box 21. The staff only needs to pull the support block 24 on one of the extension rods 22 to drive the two extension rods 22 to move synchronously in opposite directions. The support block 24 is supported on the edge of the container to keep the vertical state of the sampling tube 1 stable.

[0049] In order to solve the problem of how to ensure that the initial positions of the first piston 13 and the second piston 14 can directly collect samples, the following features are specifically set:

[0050] A positioning sleeve 211 is provided on the top of the mounting box 21 of the support frame plate 2, and the first connecting rod 131 and the first connecting rod 131 are inserted in the positioning sleeve 211; the top of the first connecting rod 131 and the second connecting rod 141 are both provided with a semicircular limiting plate 142. When the limiting plate 142 at the top of the first connecting rod 131 fits against the top of the positioning sleeve 211, the bottom surface of the first piston 13 is located above the suction tube 111. When the limiting plate 142 at the top of the second connecting rod 141 fits against the top of the positioning sleeve 211, the second piston 14 fits against the bottom of the sampling tube 11.

[0051] The support frame plate 2 in this embodiment is provided with a positioning sleeve 211 on the top of the support frame plate 2, and the first connecting rod 131 of the first piston 13 and the second connecting rod 141 of the second piston 14 are inserted in the positioning sleeve 211 and extend to the outside of the positioning sleeve 211. When sampling, the staff can make the limiting plate 142 at the top of the first connecting rod 131 and the second connecting rod 141 fit the top of the positioning sleeve 211. At this time, the bottom surface of the first piston 13 is located above the suction tube 111, and the second piston 14 fits the bottom of the sampling tube 11. When the first connecting rod 131 is pulled, the sample can be sampled immediately, and the first piston 13 moves up to fit the inner sealing piece 15. When the inner sealing piece 15 moves up to fit the top of the sampling tube 11, the collection is completed, and then the second connecting rod 141 is pulled in the process of discharging the sample, so that the first piston 13 and the second piston 14 can be easily reset when they are used next time.

[0052] A sampling method for food safety detection is applied to a sampling device for food safety detection, comprising the following steps:

[0053] Step 1: Open the thick food to be sampled or place it in the sampling tube, place the support frame plate 2 at the mouth of the sampling tube, and insert the sampling tube 1 vertically into the sampling tube;

[0054] Step 2: After a period of rest, the staff pulls up the first connecting rod 131 to move the first pistons 13 in all the sampling tubes 11 upward, and simultaneously extracts samples from the upper, middle and lower sections of the thick food;

[0055] Step 3: After the extraction is completed, take out the sampling tube 1, align the discharge tube 112 of the sampling tube 11 with the collecting tube, pull the second connecting rod 141, and move the second pistons 14 in all the sampling tubes 11 toward the discharge tube 112 to squeeze the thick food inside the sampling tube 11 out of the discharge tube 112;

[0056] Step 4: Evenly mix the obtained samples for testing.

[0057] Working principle: the staff places the support frame plate 2 horizontally at the opening of the container containing the food to be tested, and the sampling cylinder 1 is inserted into the food to be tested in a vertical manner. The sampling tubes 11 are respectively located at the upper, middle and lower sections of the food. The staff pulls the first connecting rod 131 to make all the first pistons 13 move upward inside the sampling tube 11. The negative pressure generated in the sampling tube 11 will draw the food to be tested into the sampling tube 11 through the suction tube 111, thereby completing the synchronous collection of different positions of the thick food. After the sample collection is completed, the staff takes out the sampling cylinder 1, and moves the first piston 13 to the top of the discharge tube 112 by pulling the first connecting rod 131, and pulls the second connecting rod 141 to move the second pistons 14 in all the sampling tubes 11 to the top of the suction tube 111. Therefore, the sample in the sampling tube 11 can be discharged outward through the discharge tube 112 as the second piston 14 moves upward, so as to be mixed with the samples in other sampling tubes 11 and then tested.

[0058] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A sampling device for food safety detection, characterized in that: The sampling tube (1) comprises at least three coaxially arranged sampling tubes (11), the sampling tubes (11) are connected to each other via coaxially arranged connecting tubes (12), the bottom end of each sampling tube (11) is provided with a suction tube (111) extending radially along the sampling tube (11), and the top end of each sampling tube (11) is provided with a discharge tube (112) extending radially along the sampling tube (11); Each sampling cylinder (1) is provided with a first piston (13) and a second piston (14); all the first pistons (13) are connected by a vertical first connecting rod (131); all the second pistons (14) are connected by a vertical second connecting rod (141); the first piston (13) and the second piston (14) are respectively provided with a through hole (132) having the same cross-sectional shape as the second connecting rod (141) and the first connecting rod (131); the first connecting rod (131) is inserted into the through hole (132) of the second piston (14); the second connecting rod (141) is inserted into the through hole (132) of the first piston (13); the first connecting rod (131) and the second connecting rod (141) are inserted into the connecting tube (12) and extend to the top of the sampling cylinder (1); A horizontal support frame plate (2) is arranged on the top of the sampling tube (1); The thickness of the first piston (13) and the second piston (14) is n, and the inner diameter of the suction pipe (111) and the discharge pipe (112) is m; The linear distance between the suction tube (111) and the bottom end of the sampling tube (11) is greater than n; The straight-line distance between the discharge pipe (112) and the top of the sampling pipe (11) is greater than m+n; An inner sealing piece (15) is slidably mounted inside the sampling tube (11), the inner sealing piece (15) is located inside the sampling tube (11) to seal the discharge pipe (112), and the length of the inner sealing piece (15) is not less than m; The sampling tube (11) is provided with a vertically extending waist-shaped hole (113) located on the upper side of the discharge tube (112); the waist-shaped hole (113) penetrates the side wall of the sampling tube (11); and the waist-shaped hole (113) is located in a limiting sliding groove (114) provided on the outer wall of the sampling tube (11); A guide rod (151) extending radially along the sampling tube (11) is arranged at the top of the inner blocking piece (15); the diameter of the guide rod (151) is the same as the width of the waist-shaped hole (113); the guide rod (151) passes through the waist-shaped hole (113) and extends to the outside of the sampling tube (11); the guide rod (151) is fixedly connected to the outer blocking piece (152); the outer blocking piece (152) is slidably mounted in the limiting sliding groove (114); the length of the outer blocking piece (152) is greater than the length of the waist-shaped hole (113); The inner sealing piece (15) has an arc-shaped outer wall that fits the interior of the sampling tube (11); the outer sealing piece (152) has an arc-shaped inner wall that fits the outer wall of the sampling tube (11); An annular slide rail (16) surrounding the outer wall of the sampling tube (11) is arranged outside the sampling tube (11); Two arc-shaped closed cover plates (17) are slidably mounted on the outside of the sampling tube (1), and the inner wall of the closed cover plate (17) is provided with arc-shaped clamping strips (171) having the same number as the annular slide rail (16), and the closed cover plate (17) is slidably mounted on the annular slide rail (16) via the arc-shaped clamping strips (171); The suction pipe (111) and the discharge pipe (112) have the same length, and one end of the suction pipe (111) and the discharge pipe (112) located outside the sampling tube (11) is provided with the same curvature as the inner wall of the closed cover plate (17); the straight-line distance between the top end of the suction pipe (111) and the discharge pipe (112) and the axis of the sampling tube (11) is equal to the straight-line distance between the inner wall of the closed cover plate (17) and the axis of the sampling tube (11); the closed cover plate (17) extends along the axis of the sampling tube (11), and the length of the closed cover plate (17) is greater than the sum of the lengths of the sampling tubes (11).

2. A food safety testing sampling device according to claim 1, characterized in that: The support frame plate (2) comprises a mounting box (21) mounted horizontally on the top of the sampling tube (1), wherein two parallel extension rods (22) are slidably mounted in the mounting box (21), and tooth grooves (221) are arranged on opposite sides of the two extension rods (22). A rotating gear (23) is rotatably mounted at the center of the support frame plate (2), and the rotating gear (23) is meshedly connected with the tooth grooves (221) on the extension rods (22) on both sides, and a support block (24) is fixedly mounted on one end of each extension rod (22) away from the rotating gear (23).

3. A food safety testing sampling device according to claim 2, characterized in that: A positioning sleeve (211) is provided at the top of the mounting box (21) of the support frame plate (2), and the first connecting rod (131) and the second connecting rod (131) are inserted into the positioning sleeve (211); The top ends of the first connecting rod (131) and the second connecting rod (141) are both provided with semicircular limiting plates (142). When the limiting plate (142) at the top end of the first connecting rod (131) fits against the top end of the positioning sleeve (211), the bottom surface of the first piston (13) is located above the suction tube (111). When the limiting plate (142) at the top end of the second connecting rod (141) fits against the top end of the positioning sleeve (211), the second piston (14) fits against the bottom of the sampling tube (11).

4. A sampling method for food safety detection, applied to a sampling device for food safety detection according to claim 1, characterized in that: The following steps are involved: Step 1: Open or place the thick food to be sampled in a sampling tube, place the support frame plate (2) at the mouth of the sampling tube, and vertically insert the sampling tube (1) into the sampling tube; Step 2: After a period of rest, the staff member pulls up the first connecting rod (131) to move the first pistons (13) in all the sampling tubes (11) upward, and simultaneously extracts samples from the upper, middle and lower sections of the thick food; Step 3: After the extraction is completed, the sampling tube (1) is taken out, the discharge tube (112) of the sampling tube (11) is aligned with the collecting tube, and the second connecting rod (141) is pulled to move the second pistons (14) in all the sampling tubes (11) toward the discharge tube (112), so that the thick food inside the sampling tube (11) is squeezed out from the discharge tube (112); Step 4: Evenly mix the obtained samples for testing.

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