A reagent tube fixing structure for pretreatment of methylmercury residue detection in oysters

Abstract

The present application relates to the technical field of food safety detection, and more particularly to a reagent tube fixing structure for pretreatment of methylmercury residue detection in oysters, comprising a box body and a box cover, a plurality of placing racks are arranged in the box body, the placing racks are rotatably installed in the box body, placing grooves are formed in the placing racks, reagent tubes are placed in the placing grooves, limiting bands are installed in the placing grooves through elastic assemblies, installation grooves are formed in the placing grooves, moving blocks are slidably installed in the installation grooves, first extension springs are symmetrically and fixedly installed on the moving blocks, and pressing plates are installed on the moving blocks through rotating assemblies. The reagent tubes are stably fixed on the placing racks through the cooperation of the elastic assemblies, the limiting bands, the first extension springs, the moving blocks, the rotating assemblies and the pressing plates. When the reagent box is moved, the reagent tubes in the reagent box can be effectively prevented from being bumped, the reagent tubes are better protected, the reagent tubes are prevented from being damaged, and losses are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food safety detection, and in particular to a reagent tube fixing structure for pre-treatment of methylmercury residue detection in oysters. BACKGROUND

[0002] Oysters are soft-bodied animals, also known as "milk in the sea", which are rich in a large amount of protein and zinc lacking in the human body. Eating oysters can prevent dry skin, promote skin metabolism, and decompose melanin. Oysters are filter-feeding animals with the characteristics of heavy metal enrichment and are one of the important indicator organisms of marine environmental pollutants. During the production process, oysters can enrich heavy metals such as mercury or methylmercury in the environment, so they are usually purified to remove heavy metals in the body before being put on the market. However, too long purification time can cause a decrease in oyster fresh taste flavoring substances, and too short purification time can cause a small amount of methylmercury to remain in the organization. Methylmercury is a very strong neurotoxic pollutant that can accumulate in oyster tissue through the food chain and be transmitted along the food chain, and ultimately harm humans, so it is necessary to detect the residual methylmercury in oysters. In the batch detection of aquatic animals and the emergency handling of food safety incidents, a rapid pre-treatment method for detecting methylmercury in aquatic animal food matrices is needed, and a fast and efficient methylmercury extraction and separation pre-treatment kit is also needed.

[0003] The existing pre-treatment kit places the reagent tube for detection inside the box body, but the fixing effect of the reagent tube for detection in the box body is poor. When the reagent kit is moved, the reagent tube for detection may move inside the box body, collide, cause damage to the reagent tube, and cannot be used, resulting in loss and poor protection effect. SUMMARY

[0004] The purpose of the present application is to solve the following shortcomings in the prior art: when the reagent kit is moved, the reagent tube for detection may move inside the box body, collide, cause damage to the reagent tube, and cannot be used, resulting in loss and poor protection effect. A reagent tube fixing structure for pre-treatment of methylmercury residue detection in oysters is proposed.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] A reagent tube fixing structure for pre-treatment of methylmercury residue detection in oysters, comprising a box body and a box cover, the box cover is rotatably installed on the box body, and a lock catch assembly is arranged between the box body and the box cover.

[0007] The box is internally provided with not less than one placing rack, the lower end of the placing rack is rotatably installed in the box through a rotating shaft, the placing rack comprises a placing groove, a limiting bandage, a mounting groove and a pressing plate structure, the placing groove is opened at the upper part of the placing rack and is used for placing a reagent tube, the limiting bandage is installed at the notch above the placing groove through an elastic component and is used for limiting the relative position of the reagent tube and the placing groove, the mounting groove is arranged on the bottom wall of the placing groove, the pressing plate structure is slidably installed in the mounting groove, the pressing plate structure comprises a moving block, a first telescopic spring, a rotating component and a pressing plate, the moving block is slidably installed in the mounting groove, one end of the first telescopic spring is installed on the moving block, the other end of the first telescopic spring is fixedly connected with the inner wall of the mounting groove, the pressing plate is installed on the moving block through the rotating component, when the pressing plate is rotated to the position perpendicular to the mounting groove, the surface of the pressing plate is in contact with the upper end of the reagent tube.

[0008] As a preferred scheme, the lock assembly comprises a U-shaped fixed block fixedly installed on the side surface of the box, a lock block fixedly installed on the box cover and two lock rods each installed on the fixed block through an elastic component, two moving holes are opened on the fixed block, the two lock rods are slidably installed in the two moving holes respectively, a lock hole is opened on the lock block, and one end of the two lock rods is inserted into the lock hole.

[0009] As a preferred scheme, the elastic component comprises a positioning ring sleeved on the lock rod and a second telescopic spring sleeved on the lock rod, the positioning ring is in contact with the lock block, and a pull buckle is fixedly installed on the end of each lock rod away from the other.

[0010] As a preferred scheme, the inner walls on both sides of the placing groove are provided with rectangular grooves, the elastic component comprises two sliders slidably installed in the two rectangular grooves respectively and two third telescopic springs fixedly connected with the two sliders respectively, and the two ends of the limiting bandage are fixedly connected with the two sliders respectively.

[0011] As a preferred scheme, two rectangular holes communicating with the two rectangular grooves are opened at the bottom of the placing rack, a square groove is opened in the inner wall of the rectangular hole, a jacking rod is slidably inserted into the rectangular hole, a trapezoidal block is fixedly installed on one end of the jacking rod, the inclined surface of the trapezoidal block is in sliding contact with the surface of the slider, the end of the jacking rod away from the trapezoidal block penetrates out of the rectangular hole, a straight spring rod is fixedly installed in the square groove, and one end of the straight spring rod is fixedly connected with the jacking rod through a connecting block.

[0012] As a preferred scheme, rotation grooves are symmetrically arranged on the moving block, the rotation assembly comprises two rotation rods respectively rotationally arranged in the two rotation grooves and two arc-shaped spring rods respectively fixedly arranged on the two rotation rods, and the arc-shaped spring rods are fixedly connected with the moving block at the ends away from the rotation rods.

[0013] As a preferred scheme, a connecting rod is fixedly arranged between the two rotation rods, and the connecting rod is in U shape.

[0014] As a preferred scheme, a through hole is arranged in the placing groove, and a pull rope is inserted in the through hole and fixedly connected with the upper surface of the moving block and the inner wall of the box body.

[0015] As a preferred scheme, a first limiting block and a second limiting block are fixedly arranged on the bottom wall of the box body, a first limiting hole is horizontally arranged on the first limiting block, a second limiting hole is vertically arranged on the second limiting block, a first metal block and a second metal block are fixedly arranged on the side surface of the placing rack, a limiting rod is slidingly arranged on the first metal block and the second metal block, a magnet is fixedly sleeved on the limiting rod, and the magnet is located between the first metal block and the second metal block.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The reagent tube is stably fixed on the placing rack through the cooperation of the elastic assembly, the limiting band, the first telescopic spring, the moving block, the rotation assembly and the pressing plate, and when the reagent box is moved, the reagent tubes in the reagent box can be effectively prevented from being bumped, the reagent tubes are better protected, the reagent tubes are prevented from being damaged, and the loss is reduced.

[0018] 2. When the reagent tube needs to be used, the placing rack is rotated, the limiting band and the pressing plate can be separated from the reagent tube through the cooperation of the jacks, the trapezoidal blocks and the pull ropes, so that the limiting of the reagent tube is automatically released, the reagent tube can be conveniently taken out from the box body for use, and the operation is convenient.

[0019] 3. The placing rack can be locked when it is in the horizontal and vertical states through the first metal block, the second metal block, the limiting rod, the magnet, the first limiting block and the second limiting block, so that the stability of the placing rack is ensured, and the position of the placing rack is prevented from being rotated when the reagent box is moved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A perspective structural schematic view of a reagent tube fixing structure for methyl mercury residue detection pretreatment in oysters is provided.

[0021] Figure 2A box body's perspective structural schematic view in a reagent tube fixing structure for methylmercury residue detection in oysters is provided in the present application;

[0022] Figure 3 A side view perspective structural schematic view of a placing rack in a reagent tube fixing structure for methylmercury residue detection in oysters is provided in the present application;

[0023] Figure 4 A side view perspective local cross-section structural schematic view of a placing rack in a reagent tube fixing structure for methylmercury residue detection in oysters is provided in the present application;

[0024] Figure 5 A top view perspective local cross-section structural schematic view of a placing rack in a reagent tube fixing structure for methylmercury residue detection in oysters is provided in the present application;

[0025] Figure 6 A Figure 1 enlarged structural schematic view of position A in the present application;

[0026] Figure 7 A Figure 3 enlarged structural schematic view of position B in the present application;

[0027] Figure 8 A Figure 4 enlarged structural schematic view of position C in the present application;

[0028] Figure 9 A Figure 5 enlarged structural schematic view of position D in the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS: 1 box body, 2 box cover, 3 placing rack, 4 rotating shaft, 5 placing groove, 6 reagent tube, 7 limiting band, 8 installation groove, 9 moving block, 10 first extension spring, 11 pressing plate, 12 fixed block, 13 lock block, 14 locking rod, 15 positioning ring, 16 second extension spring, 17 pull buckle, 18 sliding block, 19 third extension spring, 20 jacking rod, 21 trapezoidal block, 22 straight spring rod, 23 connecting block, 24 rotating groove, 25 rotating rod, 26 arc spring rod, 27 connecting rod, 28 pull rope, 29 first limiting block, 30 second limiting block, 31 first metal block, 32 second metal block, 33 limiting rod, 34 magnet. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0031] Embodiment 1

[0032] Reference Figures 1-9The application discloses a reagent tube fixing structure for methyl mercury residue detection in oysters, which comprises a box body 1 and a box cover 2, one end of the box cover 2 is rotatably installed on the box body 1, and the other end of the box body 1 and the box cover 2 is provided with a lock assembly; the rotatable end can be provided with a hinge structure or a buckle on the two ends of the box cover; the box body is provided with a rotating connection mode of a clamping groove in the corresponding position; the box body and the box cover are connected through the lock assembly and the rotating connection structure to form a closed box body; the box body is used for placing reagent tubes; and a handle is arranged on the outer side of the box body of the lock assembly.

[0033] The lock assembly comprises a U-shaped fixed block 12 fixedly installed on the side of the box body 1, a lock block 13 fixedly installed on the box cover 2 and two locking rods 14 each installed on the fixed block 12 through elastic components; two moving holes are formed in the fixed block 12, the two locking rods 14 are slidably installed in the two moving holes respectively, a locking hole is formed in the lock block 13, and the two locking rods 14 are inserted into the locking hole at one end; the elastic components comprise a positioning ring 15 fixedly sleeved on the locking rod 14 and a second telescopic spring 16 sleeved on the locking rod 14; the positioning ring 15 is in contact with the lock block 13; and the two locking rods 14 are each fixedly installed with a pull buckle 17 at the end away from each other.

[0034] The lock assembly can lock the box body 1 and the box cover 2 together; when the box cover 2 is closed, the box cover 2 drives the lock block 13 to move towards the fixed block 12, then pulls the two pull buckles 17 to drive the two locking rods 14 to move away from each other, at this time, the locking rod 14 drives the positioning ring 15 to move towards the fixed block 12, the second telescopic spring 16 is compressed, until the spacing between the two locking rods 14 is greater than the width of the lock block 13, then the lock block 13 is placed between the two locking rods 14, when the box cover 2 is completely closed on the box body 1, the two pull buckles 17 are released, under the elastic force of the second telescopic spring 16, the two locking rods 14 move close to each other, and the one end is inserted into the locking hole, until the positioning ring 15 is in contact with the lock block 13, the lock block 13 is locked on the fixed block 12 through the two locking rods 14, so that the box cover 2 is prevented from being opened, and the reagent tubes 6 in the box body 1 are ensured to be stored in a closed space.

[0035] The box body 1 is provided with not less than one placing rack 3 for fixing the reagent tubes, the number of the placing racks is different according to actual needs, and the placing rack in the attached drawing of the technical scheme is taken as an example; in general, considering the volume of the box body and the demand of the test, 3-8 groups of the placing racks are the best state.

[0036] The lower end of the placing rack 3 is fixedly provided with a rotating shaft 4, and the box body 1 is provided with a shaft groove for rotatingly mounting the rotating shaft 4. The shaft groove can be provided in the form of an ear plate opening a rotating shaft hole, and the rotating shaft 4 is rotatably sleeved in the rotating shaft hole. The placing rack 3 is provided with a placing groove 5, and the reagent tube 6 is placed in the placing groove 5. The placing groove 5 is provided with a limiting band 7 through an elastic assembly. The limiting band 7 is in contact with the reagent tube 6. The elastic assembly can drive the limiting band to move up and down. The limiting band is made of hard material, usually metal or plastic. In order to protect the reagent tube, the limiting band is provided in the form of an arc-shaped plate, and the two side edges of the limiting band are provided with rounded corners for protecting the reagent tube to prevent the reagent tube from being damaged by hard objects.

[0037] Further, in order to enhance the stability of the reagent tube, a pressing plate structure is arranged on the top of the placing rack for fixing the reagent tube from the top. The pressing plate structure comprises an installation groove 8 arranged in the placing groove 5, the installation groove is symmetrically arranged on the two side walls of the placing groove, a moving block 9 is slidably arranged in the installation groove 8, a first extension spring 10 is fixedly arranged on the moving block 9, the moving block and the first extension spring are both provided with two, one end of the two first extension springs 10 is fixedly connected with the inner wall of the corresponding installation groove 8, and the other end is connected with the corresponding moving block. The moving block 9 is provided with a pressing plate 11 through a rotating assembly. The surface of the pressing plate 11 is in contact with the upper end of the reagent tube 6. When the pressing plate is perpendicular to the bottom wall of the placing groove, the pressing plate is pressed at the port of the reagent tube. In order to enhance the fixing and sealing effect of the pressing plate, the surface of the pressing plate is provided with an arc-shaped protrusion, and the arc-shaped protrusion is made of a sealing material which is not easy to volatilize.

[0038] The placing rack 3 can be rotated in the box body 1 through the rotating shaft 4. When the reagent tube 6 is stored, the placing rack 3 is placed flat in the box body 1. When the reagent tube 6 needs to be taken out, the placing rack 3 is rotated to make the placing rack 3 stand vertically in the box body 1.

[0039] When the reagent tube 6 is placed, the reagent tube 6 is placed in the placing groove 5 arranged on the placing rack 3. Under the action of the elastic assembly, the limiting band 7 tends to move towards the reagent tube 6, so as to clamp the reagent tube 6 in the placing groove 5. At the same time, the pressing plate 11 is in contact with the upper port of the reagent tube 6, and the first extension spring 10 is in a stretched state. Under the action of the elasticity of the first extension spring 10, the moving block 9 tends to move towards the first extension spring 10, so that the moving block 9 drives the pressing plate 11 to tightly contact the upper end of the reagent tube 6. Under the combined limiting of the limiting band 7, the pressing plate 11 and the placing groove 5, the reagent tube 6 can be stably fixed in the box body 1.

[0040] Further, the elastic assembly comprises a rectangular slot formed in the inner wall on both sides of the placing groove 5, two sliders 18 respectively slidingly installed in the two rectangular slots, and two third extension springs 19 respectively fixedly connected with the two sliders 18, and the two ends of the limiting binding belt 7 are fixedly connected with the two sliders 18, the slider 18 can move in the rectangular slot, when the reagent tube 6 is placed in the placing groove 5, the third extension spring 19 is in a compressed state, under the elastic force of the third extension spring 19, the slider 18 drives the limiting binding belt 7 to have a moving trend in the direction of the reagent tube 6, so as to limit the reagent tube 6 in the placing groove 5. In the technical solution, the energy change generated by the compression or elongation of the spring is used, different spring lengths can be used to use different elastic potential conversion modes, and it is not limited to the change from short to long or from long to short, and the two can be replaced with each other by being arranged in different directions.

[0041] Further, in order to facilitate the use of the limiting binding belt, the elastic assembly further comprises a jacking device, the jacking device comprises two rectangular holes communicated with the two rectangular slots and formed in the bottom of the placing rack 3, a jack rod 20 is slidingly inserted in the rectangular hole, a trapezoidal block 21 is fixedly installed at one end of the jack rod 20, the inclined surface of the trapezoidal block 21 is in sliding contact with the surface of the slider 18, the end of the jack rod 20 away from the trapezoidal block 21 penetrates out of the rectangular hole, in order to prevent the jack rod from sliding out of the rectangular hole, the jacking device further comprises a rebound structure, the rebound structure is used to limit the moving distance and relative position of the jack rod in the rectangular hole, the rebound structure comprises a square slot formed in the inner wall of the rectangular hole, a straight spring rod 22 fixedly installed in the square slot, a connecting block connected with the jack rod, the connecting block slidingly moves in the square slot, and one end of the straight spring rod 22 is fixedly connected with the jack rod 20 through the connecting block 23.

[0042] When the placing rack 3 is placed flat in the box body 1, the ends of the two jack rods 20 both extend out of the rectangular hole, when it is needed to take out the reagent tube 6, the placing rack 3 is rotated to stand vertically in the box body 1, in the process of rotation, the two jack rods 20 will first contact the bottom wall of the box body 1, under the block of the bottom wall, the jack rod 20 will move towards the slider 18, the straight spring rod 22 is compressed, in the process of movement, the jack rod 20 will drive the trapezoidal block 21 to relatively move with the slider 18, the slider 18 will move along the inclined surface of the trapezoidal block 21 towards the third extension spring 19, so as to drive the limiting binding belt 7 to separate from the reagent tube 6, and automatically release the locking of the reagent tube 6, thereby facilitating the taking out of the reagent tube 6 from the placing groove 5.

[0043] The mobile block 9 is symmetrically provided with a rotating groove 24, the rotating assembly comprises two rotating rods 25 respectively rotatingly installed in the two rotating grooves 24 and two arc-shaped spring rods 26 respectively fixedly installed on the two rotating rods 25, the arc-shaped spring rod 26 is fixedly connected with the mobile block 9 at an end away from the rotating rod 25, the two rotating rods 25 are fixedly connected with the pressing plate 11, and a connecting rod 27 is fixedly installed between the two rotating rods 25, and the connecting rod 27 is in a U shape.

[0044] One end of the rotating rod 25 is rotatingly installed in the rotating groove 24, the coefficient of the arc-shaped spring rod 26 is greater than the elastic coefficient of the first telescopic spring 10, under the action of the elasticity of the arc-shaped spring rod 26, the rotating rod 25 drives the pressing plate 11 to be perpendicular to the mobile block 9, when it is needed to take out the reagent tube 6, the connecting rod 27 can be pulled to drive the two rotating rods 25 to rotate around the rotating groove 24, thereby driving the pressing plate 11 to rotate, and the pressing plate 11 is removed from the upper end of the reagent tube 6, so that the reagent tube 6 is conveniently removed from the placing groove 5.

[0045] The placing groove 5 is internally provided with a through hole, a pull rope 28 is inserted in the through hole, two ends of the pull rope 28 are fixedly connected with the upper surface of the mobile block 9 and the inner wall of the box body 1, in the process that the placing rack 3 rotates from the horizontal state to the vertical state, the mobile block 9 pulls one end of the pull rope 28, the pull rope 28 changes from the relaxed state to the taut state, after being taut, the pull rope 28 pulls the mobile block 9 to move in the installation groove 8 away from the first telescopic spring 10, when the placing rack 3 is in the vertical state, the pull rope 28 just pulls the uppermost end of the placing rack 3, and the mobile block 9 drives the pressing plate 11 to be separated from the upper end of the reagent tube 6, so that the reagent tube 6 is automatically released from the limiting.

[0046] The box body 1 is fixedly provided with a first limiting block 29 and a second limiting block 30 on the bottom wall, a first limiting hole is horizontally formed in the first limiting block 29, a second limiting hole is vertically formed in the second limiting block 30, a first metal block 31 and a second metal block 32 are fixedly installed on the side surface of the placing rack 3, a limiting rod 33 is slidingly installed on the first metal block 31 and the second metal block 32, a magnet 34 is fixedly sleeved on the limiting rod 33, and the magnet 34 is located between the first metal block 31 and the second metal block 32.

[0047] When the placing rack 3 is horizontally placed in the box body 1, the movable limiting rod 33 is inserted into the first limiting hole formed in the first limiting block 29, the magnet 34 on the limiting rod 33 is in contact with the first metal block 31, the magnet 34 and the first metal block 31 are attracted to each other by the magnetic force, so that the one end of the limiting rod 33 is prevented from being removed from the first limiting hole.

[0048] When the placing rack 3 is horizontally placed in the box body 1, one end of the limiting rod 33 can be vertically inserted into the second limiting hole in the second limiting block 30, and the magnet 34 is in contact with the second metal block 32, so that the placing rack 3 can be stably erected in the box body 1, and the position of the placing rack 3 is prevented from being rotated when the reagent box is moved.

[0049] In the present application, when the reagent tube 6 is placed, the reagent tube 6 is placed in the placing groove 5 in the placing rack 3, under the action of the elastic assembly, the limiting bandage 7 has a tendency to move towards the reagent tube 6, so that the reagent tube 6 is clamped in the placing groove 5, and the pressing plate 11 is in contact with the upper end of the reagent tube 6, under the action of the elastic force of the first telescopic spring 10, the moving block 9 drives the pressing plate 11 to tightly contact the upper end of the reagent tube 6, and under the combined limiting of the limiting bandage 7, the pressing plate 11 and the placing groove 5, the reagent tube 6 can be stably fixed in the box body 1, and when the reagent box is moved, the reagent tube 6 in the reagent box can be effectively prevented from being bumped, the reagent tube 6 is better protected, the reagent tube 6 is prevented from being damaged, and the loss is reduced.

[0050] When the reagent tube 6 needs to be used, the box cover 2 can be opened, then the limiting rod 33 is moved, the magnet 34 is separated from the first metal block 31, one end of the limiting rod 33 is pulled out from the first limiting hole, then the placing rack 3 is rotated through the rotating shaft 4, and the placing rack 3 is rotated from the horizontal state to the vertical state;

[0051] During the rotation of the placing rack 3, the two top rods 20 are in contact with the bottom wall of the box body 1 and limit the top rods 20, at this time, the top rods 20 move towards the sliding block 18, and drive the trapezoidal block 21 to relatively move with the sliding block 18, the sliding block 18 moves along the inclined surface of the trapezoidal block 21 towards the third telescopic spring 19, so as to drive the limiting bandage 7 to separate from the reagent tube 6 and automatically release the limiting of the reagent tube 6;

[0052] Meanwhile, during the rotation of the placing rack 3, the pull rope 28 pulls the moving block 9 to move away from the first telescopic spring 10, the moving block 9 drives the pressing plate 11 to separate from the upper end of the reagent tube 6 through the two rotating rods 25, and automatically releases the limiting of the reagent tube 6, after the limiting of the reagent tube 6 by the limiting bandage 7 and the pressing plate 11 is simultaneously released, the two rotating rods 25 are rotated, the pressing plate 11 is rotated, the pressing plate 11 is moved away from above the reagent tube 6, and finally the reagent tube 6 can be conveniently taken out from the placing groove 5, and the operation is convenient.

[0053] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A pretreatment reagent tube fixing structure for detecting methylmercury residues in oysters, comprising a box body (1) and a box cover (2), characterized in that, The lid (2) is rotatably mounted on the body (1), and a locking assembly is provided between the body (1) and the lid (2); The box body (1) is provided with multiple placement racks (3). The lower end of each placement rack (3) is rotatably installed in the box body (1) via a rotating shaft (4). Each placement rack (3) includes a placement groove (5), a limiting strap (7), a mounting groove (8), and a pressure plate structure. The placement groove (5) is opened on the upper part of the placement rack (3) for placing reagent tubes (6). The limiting strap (7) is installed at the opening above the placement groove (5) via an elastic component to limit the relative position of the reagent tubes (6) and the placement groove (5). The mounting groove (8) is set on the bottom wall of the placement groove (5). The pressure plate structure is slidably installed in the mounting groove (8). The pressure plate structure includes a sliding... The assembly includes a moving block (9), a first telescopic spring (10), a rotating component, and a pressure plate (11). The moving block (9) is slidably installed in the mounting groove (8). One end of the first telescopic spring (10) is installed on the moving block (9), and the other end of the first telescopic spring (10) is fixedly connected to the inner wall of the mounting groove (8). The pressure plate (11) is installed on the moving block (9) through the rotating component. When the pressure plate (11) rotates to a position perpendicular to the mounting groove (8), the surface of the pressure plate (11) contacts the upper end of the reagent tube (6). Rectangular grooves are provided on both sides of the inner wall of the placement groove (5). The elastic component includes two sliders that are slidably installed in the two rectangular grooves respectively. (18) and two third telescopic springs (19) fixedly connected to the two sliders (18) respectively. The two ends of the limiting strap (7) are fixedly connected to the two sliders (18) respectively. The bottom of the placement frame (3) has two rectangular holes that are connected to the two rectangular slots respectively. The inner wall of the rectangular hole is provided with a square slot. A top rod (20) is slidably inserted in the rectangular hole. A trapezoidal block (21) is fixedly installed at one end of the top rod (20). The inclined surface of the trapezoidal block (21) slides in contact with the surface of the slider (18). The end of the top rod (20) away from the trapezoidal block (21) passes through the rectangular hole. A straight spring rod (22) is fixedly installed in the square slot. One end of the straight spring rod (22) The moving block (9) is fixedly connected to the top rod (20) via the connecting block (23). The moving block (9) is symmetrically provided with rotating grooves (24). The rotating assembly includes two rotating rods (25) that are respectively rotatably installed in the two rotating grooves (24) and two arc-shaped spring rods (26) that are respectively fixedly installed on the two rotating rods (25). The end of the arc-shaped spring rod (26) away from the rotating rod (25) is fixedly connected to the moving block (9). Both rotating rods (25) are fixedly connected to the pressure plate (11). The placement groove (5) is provided with a through hole. A pull rope (28) is inserted into the through hole. The two ends of the pull rope (28) are fixedly connected to the upper surface of the moving block (9) and the inner wall of the box (1) respectively.

2. The pretreatment reagent tube fixation structure for detecting methylmercury residues in oysters according to claim 1, characterized in that, The locking assembly includes a U-shaped fixing block (12) fixedly installed on the side of the box body (1), a locking block (13) fixedly installed on the box cover (2), and two locking rods (14) installed on the fixing block (12) by elastic components. The fixing block (12) has two moving holes, and the two locking rods (14) are slidably installed in the two moving holes respectively. The locking block (13) has a locking hole, and one end of the two locking rods (14) is inserted into the locking hole.

3. The pretreatment reagent tube fixation structure for detecting methylmercury residues in oysters according to claim 2, characterized in that, The elastic component includes a positioning ring (15) fixedly sleeved on the locking rod (14) and a second telescopic spring (16) sleeved on the locking rod (14). The positioning ring (15) is in contact with the locking block (13), and a pull buckle (17) is fixedly installed at the ends of the two locking rods (14) that are far apart from each other.

4. The pretreatment reagent tube fixation structure for detecting methylmercury residues in oysters according to claim 3, characterized in that, A connecting rod (27) is fixedly installed between the two rotating rods (25), and the connecting rod (27) is U-shaped.

5. The pretreatment reagent tube fixation structure for detecting methylmercury residues in oysters according to claim 4, characterized in that, The bottom wall of the box (1) is fixedly installed with a first limiting block (29) and a second limiting block (30). The first limiting block (29) has a first limiting hole horizontally opened, and the second limiting block (30) has a second limiting hole vertically opened. The side of the placement rack (3) is fixedly installed with a first metal block (31) and a second metal block (32). The first metal block (31) and the second metal block (32) are slidably installed with a limiting rod (33). A magnet (34) is fixedly sleeved on the limiting rod (33). The magnet (34) is located between the first metal block (31) and the second metal block (32).

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