A sample preparation device for food safety testing

Abstract

The present invention relates to the technical field of sample preparation for detection, and specifically to a sample preparation device for food safety detection, comprising a fixed bottom plate, wherein two columns distributed left and right are fixedly installed at the front and rear of the fixed bottom plate, wherein the tops of the two columns located at the front and the tops of the two columns located at the rear are fixedly installed with guide rails, and sample preparation components are movably arranged between the two guide rails, and a driving component is arranged at the top of the fixed bottom plate. The driving component drives the sample preparation square groove to move back and forth left and right, so that the resin roller crushes the fruits and vegetables, and the juice in the fruits and vegetables is crushed out, and the crushed juice flows to the middle part of the sample preparation square groove along the bottom wall of the sample preparation square groove and the inner wall slope of the guide hole under the action of gravity, and the crushed fruit and vegetable residues will not move to the middle of the sample preparation square groove due to the blocking effect of the interception plate, thereby effectively separating the fruit and vegetable residues from the juice, and separately preparing samples for the fruit and vegetable residues and the fruit and vegetable juice.

Description

Technical Field

[0001] The invention relates to the technical field of detection and sample preparation, in particular to a sample preparation device for food safety detection. 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, so as to promote the development of the food industry in the direction of large-scale, continuous and automated production;

[0003] According to a Chinese patent disclosed in the authorization announcement number: CN112857931B, a sample preparation device for food safety testing has a simple structure, which reduces the manufacturing cost of the device, thereby reducing the cost of food safety testing, and is conducive to meeting actual usage needs. However, there are still shortcomings. When the device is used to prepare samples of fruit and vegetable foods, it does not have the technical effect of separating and preparing fruit and vegetable residues and fruit and vegetable juices, so it is not convenient to independently test the fruit and vegetable flesh and fruit and vegetable juices. Summary of the invention

[0004] To this end, the present invention provides a sample preparation device for food safety testing to solve the above-mentioned problems.

[0005] The present invention provides the following technical solution: a sample preparation device for food safety detection, comprising a fixed bottom plate, wherein two columns distributed on the left and right are fixedly installed at the front and rear of the fixed bottom plate, wherein the tops of the two columns located at the front and the tops of the two columns located at the rear are fixedly installed with guide rails, the number of the guide rails is two, and a sample preparation component is movably arranged between the two guide rails;

[0006] The sample preparation component comprises a sample preparation square groove located between two guide rails, the front and rear parts of the sample preparation square groove are fixedly installed with sliders, the sliders are slidably connected with the guide rails, the tops of the guide rails are fixedly installed with two guide rods distributed left and right, the peripheries of the two guide rods are slidably installed with a sliding seat, the peripheries of the guide rods are sleeved with a first spring, the first spring is fixedly installed between the top of the guide rail and the bottom of the sliding seat, there are two sliding seats, and the two sliding seats are distributed front and back, and the insides of the two sliding seats are rotatably installed A hollow shaft sleeve is installed, and a resin roller is fixedly installed between the two hollow shaft sleeves. The bottom of the resin roller abuts against the bottom wall of the sample preparation square groove. A central cavity is opened inside the resin roller, and a plurality of adsorption cavities distributed front and back are opened on the outer wall of the resin roller. The plurality of adsorption cavities are connected with the interior of the central cavity. A liquid suction hose is fixedly installed at the rear end of one of the hollow shaft sleeves located at the rear, and the interior of the liquid suction hose is connected with the interior of the hollow shaft sleeve. A negative pressure component is fixedly provided on the top of the fixed bottom plate.

[0007] As a preferred solution of the present invention, the negative pressure component includes a square cylinder fixedly mounted on the top of a fixed bottom plate, a square piston is slidably mounted on the inner wall of the square cylinder, two left-right distributed pressure rods are fixedly mounted on the top of the square piston, a V-shaped pressure strip is fixedly mounted on the top of the two pressure rods, a third spring is fixedly mounted on the outer periphery of the pressure rod, and the third spring is fixedly mounted between the top of the square cylinder and the bottom of the V-shaped pressure strip, a fixed rod is fixedly mounted on the bottom of the sample preparation square groove, a pressure head is fixedly mounted on the bottom of the fixed rod, and the bottom of the pressure head abuts against the top of the V-shaped pressure strip. Exhaust holes are penetrated through the left and right parts of the square cylinder, and exhaust check valves are fixedly installed on the periphery of the openings of the exhaust holes. An intake hole is penetrated through the rear part of the square cylinder, and an intake check valve is fixedly installed on the periphery of the opening of the intake hole. An intake pipe is fixedly installed on the end of the intake check valve away from the intake hole, and an air connecting head is fixedly installed on the end of the intake pipe away from the intake check valve. A liquid accumulation bottle is screwed on the bottom thread of the connecting head, and one end of the liquid suction hose away from the hollow sleeve is fixedly connected to the side of the connecting head, and the interior of the liquid suction hose is communicated with the interior of the connecting head.

[0008] As a preferred solution of the present invention, a cut-off component is provided inside the resin roller, and the cut-off component includes a plurality of telescopic holes opened inside the resin roller, and the plurality of telescopic holes are distributed front to back, and the interior of the telescopic holes is connected with the interior of the central cavity, and the positions of the telescopic holes correspond one to one with the positions of the adsorption cavity, and plunger rods are slidably installed inside the telescopic holes, and a sealing ring is fixedly installed on one end of the plunger rod close to the adsorption cavity, and a sliding cavity is provided inside the resin roller, and the sliding cavity is located at one end of the telescopic hole away from the central cavity, and the sliding cavity is connected with the interiors of the plurality of telescopic holes, and a driven magnetic block is slidably installed inside the sliding cavity, and a side of the driven magnetic block close to the plunger rod is fixedly connected to the end of the plunger rod, and a fixed magnetic block is fixedly provided on the top of the sample preparation square groove, and the magnetism of the fixed magnetic block is opposite to that of the driven magnetic block.

[0009] As a preferred solution of the present invention, two second springs distributed front and back are fixedly mounted on a side of the driven magnetic block away from the plunger rod, and one end of the second spring away from the driven magnetic block is fixedly connected to an inner wall of one side of the sliding cavity.

[0010] As a preferred solution of the present invention, a driving component is provided on the top of the fixed base plate, and the driving component includes a bearing seat fixedly mounted on the surface of the column, and there are four bearing seats, wherein a reciprocating screw is rotatably mounted between two of the left and right bearing seats, and the reciprocating screw is located at the bottom of the sample making square groove, and the outer walls of the reciprocating screws are connected with reciprocating wire sleeves through threaded cooperation, and the top of the reciprocating wire sleeves is fixedly connected to the bottom of the sample making square groove, and a power motor is fixedly mounted on the left end of the top of the fixed base plate, and a driving pulley is fixedly mounted on the output shaft of the power motor, and a driven pulley is fixedly mounted on the left ends of the two reciprocating screws, and a power belt is commonly sleeved between the two driven pulleys and the driving pulley.

[0011] As a preferred solution of the present invention, the front and rear parts of the sample making square groove are provided with driven components, and the driven components include gears fixedly installed on the outer wall of the hollow shaft sleeve. The front and rear parts of the sample making square groove are fixedly installed with two fixed pick plates distributed on the left and right, and telescopic columns are slidably installed inside the two fixed pick plates. Connecting angle codes are fixedly installed on the tops of the two telescopic columns, and fifth springs are sleeved on the peripheries of the telescopic columns. The fifth springs are fixedly installed between the tops of the fixed pick plates and the bottoms of the connecting angle codes. A swing rack is fixedly installed between the two connecting angle codes on one side close to the sample making square groove, and the swing rack is located at the bottom of the gear, and the swing rack and the gear are meshed with each other.

[0012] As a preferred solution of the present invention, the power motor is located outside one of the exhaust one-way valves.

[0013] As a preferred solution of the present invention, two intercepting components distributed on the left and right are provided inside the sample preparation square groove, and the intercepting components include a slide groove opened at the bottom of the sample preparation square groove, and an intercepting plate is slidably installed inside the slide groove, and a plurality of diversion holes distributed vertically and horizontally are opened inside the intercepting plate, and two spring supports distributed front and back are fixedly installed on the bottom of the intercepting plate, and a fourth spring is fixedly installed between the tops of the two spring supports and the bottom of the sample preparation square groove.

[0014] As a preferred solution of the present invention, two fixed bent frames symmetrically distributed on the left and right are fixedly installed on the top of one of the guide rails located at the rear end, and the ends of the fixed bent frames away from the guide rails are fixedly connected to the side walls of the connecting air head, and the front sides of the two fixed bent frames are commonly connected to a cross beam, and the fixed magnetic block is connected to the cross beam through a fixed bracket.

[0015] As a preferred solution of the present invention, an O-type airtight gasket is provided between the liquid collection bottle (6) and the connecting gas head (5013).

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

[0017] 1. In the present invention, the sample preparation square trough is driven to move back and forth left and right by a driving component, so that the resin roller crushes the fruits and vegetables to crush the juice in the fruits and vegetables. The crushed juice flows to the middle part of the sample preparation square trough along the bottom wall of the sample preparation square trough and the inner wall slope of the guide hole under the action of gravity, while the crushed fruit and vegetable residues will not move to the middle of the sample preparation square trough due to the blocking effect of the interception plate, thereby effectively separating the fruit and vegetable residues from the juice, and separately preparing samples for the fruit and vegetable residues and the fruit and vegetable juice.

[0018] 2. In the present invention, the negative pressure component is driven to operate during the left-right movement of the sample preparation square trough, so that negative pressure is generated inside the square cylinder, and the negative pressure is transmitted to the inside of the connecting air head and the liquid accumulation bottle through the air suction one-way valve and the air suction pipe. The negative pressure inside the liquid accumulation bottle is then transmitted to the inside of the hollow shaft sleeve and the central cavity through the liquid suction hose. When the sample preparation square trough moves to the middle position of the two guide rails, the resin roller drives the multiple adsorption cavities to rotate to a vertical downward state, and the negative pressure condition inside the central cavity is transmitted to the inside of the multiple adsorption cavities, and the fruit and vegetable juices that converge into the middle of the sample preparation square trough are sucked into the inside of the central cavity through the multiple adsorption cavities, and then sucked into the inside of the connecting air head through the hollow shaft sleeve and the liquid suction hose, and then flow into the inside of the liquid accumulation bottle for collection.

[0019] 3. In the present invention, when the sample preparation square groove moves toward the middle and has not yet reached the middle, and the multiple adsorption cavities have not reached the vertical downward state with the rotation of the resin roller, the driven magnetic block has not reached the bottom of the fixed magnetic block. At this time, the elastic force of the second spring pushes the driven magnetic block together with the plunger rod, so that the sealing ring is tightly attached to the inner wall of the adsorption cavity, resulting in the interruption of conduction between the central cavity and the interior of the adsorption cavity. Therefore, the square piston moves upward, resulting in the negative pressure generated inside the square cylinder, which is transmitted to the internal storage of the hollow shaft sleeve and the central cavity through the suction pipe, the connecting air head, the liquid accumulation bottle, and the liquid suction hose, so that the internal pressure of the central cavity is accumulated to generate sufficient negative pressure suction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure of part A;

[0022] Figure 3 The structure of the sample preparation square trough in the present invention is shown in FIG. Figure 1 ;

[0023] Figure 4 The structure of the sample preparation square trough in the present invention is shown in FIG. Figure 2 ;

[0024] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part B;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the resin roller and the connecting air head in the present invention;

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure of part C;

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the square cylinder in the present invention.

[0028] In the figure: 1, fixed bottom plate; 2, column; 3, guide rail; 401, sample preparation square groove; 402, slider; 403, guide rod; 404, sliding seat; 405, first spring; 406, hollow shaft sleeve; 407, resin roller; 4007, central cavity; 408, adsorption cavity; 409, telescopic hole; 4010, plunger rod; 4011, sealing ring; 4012, sliding cavity; 4013, driven magnetic block; 4014, second spring; 4015, liquid suction hose; 4016, fixed magnetic block; 501, square cylinder; 502, square piston; 503, pressure rod; 504, V-shaped pressure strip; 505, third spring; 506, fixed rod; 507, pressure head ;508, exhaust hole;509, exhaust one-way valve;5010, intake hole;5011, intake one-way valve;5012, intake pipe;5013, connecting air head;6, effusion bottle;701, slide;702, interception plate;703, guide hole;704, spring support;705, fourth spring;801, bearing seat;802, reciprocating screw rod;803, driven pulley;804, power motor;805, driving pulley;806, power belt;807, reciprocating screw sleeve;901, gear;902, fixed pick plate;903, swing rack;904, connecting angle code;905, telescopic column;906, fifth spring;10, fixed bending frame;11, crossbeam. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-8 The technical solution provided by the present invention specifically includes the following embodiments: Embodiment 1

[0031] A sample preparation device for food safety testing comprises a fixed bottom plate 1, two columns 2 distributed left and right are fixedly installed at the front and rear of the fixed bottom plate 1, wherein guide rails 3 are fixedly installed at the tops of the two columns 2 located at the front and the tops of the two columns 2 located at the rear, and there are two guide rails 3, a sample preparation component is movably arranged between the two guide rails 3, and a driving component is arranged at the top of the fixed bottom plate 1;

[0032] The sample preparation component includes a sample preparation square groove 401 located between the two guide rails 3, and the front and rear parts of the sample preparation square groove 401 are fixedly installed with sliders 402, and the sliders 402 are slidably connected with the guide rails 3. The top of the guide rails 3 is fixedly installed with two guide rods 403 distributed left and right, and the peripheries of the two guide rods 403 are slidably installed with a sliding seat 404. The peripheries of the guide rods 403 are sleeved with a first spring 405, and the first spring 405 is fixedly installed between the top of the guide rails 3 and the bottom of the sliding seat 404. There are two sliding seats 404, and the two sliding seats 404 are distributed front and back. The inner A hollow shaft sleeve 406 is rotatably installed on each of the two hollow shaft sleeves 406, a resin roller 407 is fixedly installed between the two hollow shaft sleeves 406, the bottom of the resin roller 407 abuts against the bottom wall of the sample preparation square groove 401, a central cavity 4007 is penetrated through the interior of the resin roller 407, and a plurality of adsorption cavities 408 distributed front and back are opened on the outer wall of the resin roller 407, and the plurality of adsorption cavities 408 are all connected with the interior of the central cavity 4007, wherein a liquid suction hose 4015 is fixedly installed at the rear end of a hollow shaft sleeve 406 located at the rear, and the interior of the liquid suction hose 4015 is connected with the interior of the hollow shaft sleeve 406;

[0033] Two interception components distributed left and right are arranged inside the sample preparation square groove 401, and the interception components include a slide groove 701 opened at the bottom of the sample preparation square groove 401, and an interception plate 702 is slidably installed inside the slide groove 701. A plurality of diversion holes 703 distributed vertically and horizontally are penetrated inside the interception plate 702, and two spring holders 704 distributed front and back are fixedly installed at the bottom of the interception plate 702, and a fourth spring 705 is fixedly installed between the top of the two spring holders 704 and the bottom of the sample preparation square groove 401;

[0034] The front and rear parts of the sample preparation square slot 401 are both provided with driven components, and the driven components include a gear 901 fixedly installed on the outer wall of the hollow shaft sleeve 406. The front and rear parts of the sample preparation square slot 401 are both fixedly installed with two fixed pick plates 902 distributed on the left and right. Telescopic columns 905 are slidably installed inside the two fixed pick plates 902. The tops of the two telescopic columns 905 are both fixedly installed with connecting angle codes 904. The outer periphery of the telescopic columns 905 is sleeved with fifth springs 906. The fifth spring 906 is fixedly installed between the top of the fixed pick plate 902 and the bottom of the connecting angle code 904. A swing rack 903 is fixedly installed between the two connecting angle codes 904 on one side of the sample preparation square slot 401. The swing rack 903 is located at the bottom of the gear 901, and the swing rack 903 and the gear 901 are meshed with each other.

[0035] Specifically, in this embodiment, the sample preparation square groove 401 is driven to reciprocate left and right by a driving component. Since the sample preparation square groove 401 is slidably connected to the two guide rails 3 through two sliders 402, the reciprocating left and right movement of the sample preparation square groove 401 can be more stable and smooth. It should be noted that the bottom of the sample preparation square groove 401 is a V-shaped inclined structure, which will cause the bottom of the resin roller 407 to be pushed upward by the inclined surface of the bottom wall of the sample preparation square groove 401 during the movement of the sample preparation square groove 401 to the left and right, and drive the two hollow shaft sleeves 406 and the sliding seat 404 to move upward. The upward movement of the sliding seat 404 causes the first spring 405 to be stretched and stored. When the sample preparation square groove 401 moves toward the middle, the resin roller 407 is reset downward under the action of the resilience of the first spring 405, so that when the sample preparation square groove 401 of the device moves left and right, the bottom of the resin roller 407 can always be in close contact with the bottom wall of the sample preparation square groove 401, so that the fruits and vegetables inside the sample preparation square groove 401 are crushed to squeeze out the juice in the fruits and vegetables. The squeezed juice flows along the bottom wall of the sample preparation square groove 401 and the inner wall slope of the guide hole 703 to the middle part of the sample preparation square groove 401 under the action of gravity, and the crushed fruit and vegetable residues will not move to the middle of the sample preparation square groove 401 due to the blocking effect of the interception plate 702, so that the fruit and vegetable residues are effectively separated from the juice, and the fruit and vegetable residues and the fruit and vegetable juice are separately sampled;

[0036] When the sample preparation square groove 401 moves to the left and right, the interception plate 702 will be driven to move together. When the interception plate 702 moves to the bottom of the resin roller 407, the interception plate 702 is pushed downward by the resin roller 407, and slides downward along the slide groove 701, driving the spring holder 704 to move downward together, causing the fourth spring 705 to be stretched and stored, so that the resin roller 407 is always in contact with the bottom wall of the sample preparation square groove 401. When the sample preparation square groove 401 moves and drives the interception plate 702 to move away from the bottom of the resin roller 407, the resilience of the fourth spring 705 is released, pushing the spring holder 704 and the interception plate 702 to move upward and reset along the slide groove 701, intercepting the fruit and vegetable residue again, and preventing the fruit and vegetable residue from moving to the middle area of ​​the sample preparation square groove 401.

[0037] During the left-right movement of the sample preparation square groove 401, the swing rack 903 is also driven to move together through the connection between the fixed pick plate 902, the telescopic column 905 and the connecting angle code 904. The movement of the swing rack 903 drives the gear 901 meshing therewith to rotate. The rotation of the gear 901 drives the resin roller 407 to rotate through the hollow shaft sleeve 406, and under the elastic force of the fifth spring 906, it can be ensured that the swing rack 903 is always meshed with the gear 901. It should be noted that the specifications of the gear 901 and the swing rack 903 are adaptively set to ensure that the rotation speed of the resin roller 407 is adapted to the left-right movement of the sample preparation square groove 401, and to ensure that there is no relative sliding between the outer wall of the resin roller 407 and the bottom wall of the sample preparation square groove 401, and the outer wall of the resin roller 407 is always in rolling contact with the bottom wall of the sample preparation square groove 401. Embodiment 2

[0038] A negative pressure component is fixedly provided on the top of the fixed bottom plate 1, and the negative pressure component includes a square cylinder 501 fixedly installed on the top of the fixed bottom plate 1, a square piston 502 is slidably installed on the inner wall of the square cylinder 501, and two left and right distributed pressure rods 503 are fixedly installed on the top of the square piston 502, and a V-shaped pressure strip 504 is fixedly installed on the top of the two pressure rods 503. A third spring 505 is sleeved on the outer periphery of the pressure rod 503, and the third spring 505 is fixedly installed between the top of the square cylinder 501 and the bottom of the V-shaped pressure strip 504. A fixed rod 506 is fixedly installed on the bottom of the sample preparation square groove 401, and a pressure head 507 is fixedly installed on the bottom of the fixed rod 506. The bottom of the pressure head 507 abuts against the top of the V-shaped pressure strip 504. The left side of the square cylinder 501 An exhaust hole 508 is formed through the front and right parts of the square cylinder 501, and an exhaust one-way valve 509 is fixedly installed on the periphery of the opening of the exhaust hole 508. An air intake hole 5010 is formed through the rear part of the square cylinder 501, and an air intake one-way valve 5011 is fixedly installed on the periphery of the opening of the air intake hole 5010. An air intake pipe 5012 is fixedly installed on the end of the air intake one-way valve 5011 away from the air intake hole 5010, and an air connection head 5013 is fixedly installed on the end of the air intake pipe 5012 away from the air intake one-way valve 5011. The bottom thread of the air connection head 5013 is screwed with the liquid accumulation bottle 6, and the end of the liquid suction hose 4015 away from the hollow shaft sleeve 406 is fixedly connected to the side of the air connection head 5013, and the interior of the liquid suction hose 4015 is connected to the interior of the air connection head 5013.

[0039] Specifically, in this embodiment, when the sample preparation square groove 401 moves to the left or right, the fixed rod 506 is also driven to move together with the pressure head 507. The left and right movement of the pressure head 507 generates a downward thrust on the top of the V-shaped pressure strip 504, and the two pressure rods 503 and the square piston 502 are compressed downward. During this period, the two third springs 505 are compressed and stored, and the square piston 502 is compressed downward, and the air inside the square cylinder 501 is discharged to the outside through the left and right exhaust holes 508 and the exhaust check valve 509, while the air intake check valve 509 is discharged to the outside. Due to the one-way blocking effect of the check valve 5011, the air inside the square cylinder 501 will not enter the interior of the suction pipe 5012. At the same time, the air discharged through the exhaust check valve 509 will also cause a blowing effect on the surface of the power motor 804, which can take away the heat from the surface of the power motor 804 and improve the heat dissipation effect of the power motor 804. As the sample preparation square groove 401 moves toward the middle, the fixing rod 506 and the pressure head 507 move toward the middle, and the rebound force of the two third springs 505 pushes the V-shaped pressure strip 504 upward. The V-shaped pressure strip 504 is gradually reset, and the two pressure rods 503 are reset upward, driving the two pressure rods 503 and the square piston 502 to move upward. At this time, due to the one-way blocking effect of the two exhaust check valves 509, negative pressure is generated inside the square cylinder 501, and the negative pressure is transmitted to the connection head 5013 and the inside of the liquid accumulation bottle 6 through the suction check valve 5011 and the suction pipe 5012. The negative pressure inside the liquid accumulation bottle 6 is then transmitted to the inside of the hollow shaft sleeve 406 and the central cavity 4007 through the suction hose 4015, and the sample preparation square groove 401 Whenever it moves to the middle position of the two guide rails 3, the resin roller 407 drives the multiple adsorption cavities 408 to rotate to a vertical downward state, and the negative pressure condition inside the central cavity 4007 is transmitted to the inside of the multiple adsorption cavities 408, and the fruit and vegetable juice that converges to the middle of the sample preparation square groove 401 is sucked into the interior of the central cavity 4007 through the multiple adsorption cavities 408, and then sucked into the interior of the connecting air head 5013 through the hollow shaft sleeve 406 and the liquid suction hose 4015, and then flows into the interior of the liquid accumulation bottle 6 for collection.

[0040] Furthermore, an O-type airtight gasket is provided between the liquid collection bottle 6 and the connecting gas head 5013. By providing an O-type airtight gasket between the liquid collection bottle 6 and the connecting gas head 5013, it is ensured that no pressure release occurs at the connection between the liquid collection bottle 6 and the connecting gas head 5013, thereby ensuring that sufficient negative pressure is generated inside the liquid collection bottle 6. Embodiment 3

[0041] The resin roller 407 is provided with a cut-off component inside. The cut-off component includes a plurality of telescopic holes 409 opened inside the resin roller 407. The plurality of telescopic holes 409 are distributed front and back. The inside of the telescopic holes 409 is connected to the inside of the central cavity 4007. The positions of the telescopic holes 409 correspond to the positions of the adsorption cavity 408 one by one. The insides of the telescopic holes 409 are all slidably installed with plunger rods 4010. The ends of the plunger rods 4010 close to the adsorption cavity 408 are all fixedly installed with sealing rings 4011. The resin roller 407 A sliding cavity 4012 is provided inside the sliding cavity 4012, which is located at one end of the telescopic hole 409 away from the central cavity 4007, and the sliding cavity 4012 is connected to the inside of the plurality of telescopic holes 409, a driven magnetic block 4013 is slidably installed inside the sliding cavity 4012, and a side of the driven magnetic block 4013 close to the plunger rod 4010 is fixedly connected to the end of the plunger rod 4010, and a fixed magnetic block 4016 is fixedly provided on the top of the sample preparation square groove 401, and the magnetism of the fixed magnetic block 4016 is opposite to that of the driven magnetic block 4013;

[0042] Two second springs 4014 distributed front and back are fixedly installed on one side of the driven magnetic block 4013 away from the plunger rod 4010, and one end of the second spring 4014 away from the driven magnetic block 4013 is fixedly connected to the inner wall of one side of the sliding cavity 4012;

[0043] Specifically, in this embodiment, when the sample preparation square groove 401 moves to the middle position of the two guide rails 3, the resin roller 407 drives the multiple adsorption cavities 408 to rotate to a vertical downward state, and the driven magnetic block 4013 rotates to the bottom of the fixed magnetic block 4016 with the resin roller 407. Since the magnetic properties of the fixed magnetic block 4016 and the driven magnetic block 4013 are opposite, the fixed magnetic block 4016 will generate an upward magnetic attraction on the driven magnetic block 4013, causing the driven magnetic block 4013 to move along the vertical downward state. The inner wall of the sliding cavity 4012 moves upward to compress the second spring 4014, and the driven magnetic block 4013 moves upward to drive the plurality of plunger rods 4010 and the plurality of sealing rings 4011 to move upward together, so that the plurality of sealing rings 4011 slide out from the top of the plurality of adsorption cavities 408. At this time, the plurality of adsorption cavities 408 and the interior of the central cavity 4007 are connected, and the negative pressure condition inside the central cavity 4007 is transmitted to the interior of the plurality of adsorption cavities 408, thereby generating an adsorption effect on the fruit and vegetable juice.

[0044] It should be noted that, when the sample preparation square groove 401 has not reached the middle during the process of moving towards the middle, the multiple adsorption chambers 408 have not reached the vertical downward state with the rotation of the resin roller 407, and the driven magnetic block 4013 has not reached the bottom of the fixed magnetic block 4016. At this time, the elastic force of the second spring 4014 pushes the driven magnetic block 4013 together with the plunger rod 4010, so that the sealing ring 4011 is tightly attached to the inner wall of the adsorption chamber 408, resulting in the central chamber 4007 and the internal connection with the adsorption chamber 408 being interrupted. Therefore, the square piston 502 moves upward, resulting in the negative pressure generated inside the square cylinder 501, which is transmitted to the hollow shaft sleeve 406 and the internal storage of the central chamber 4007 through the suction pipe 5012, the connecting air head 5013, the accumulation bottle 6, and the suction hose 4015, so that the internal pressure of the central chamber 4007 is accumulated, generating sufficient negative pressure suction. Embodiment 4

[0045] The driving component includes a bearing seat 801 fixedly mounted on the surface of the column 2, and there are four bearing seats 801. A reciprocating screw rod 802 is rotatably mounted between the left and right bearing seats 801. The reciprocating screw rod 802 is located at the bottom of the sample preparation square groove 401. The outer wall of the reciprocating screw rod 802 is connected with a reciprocating wire sleeve 807 through threaded matching. The top of the reciprocating wire sleeve 807 is fixedly connected to the bottom of the sample preparation square groove 401. A power motor 804 is fixedly mounted on the left end of the top of the fixed bottom plate 1. A driving pulley 805 is fixedly mounted on the output shaft of the power motor 804. A driven pulley 803 is fixedly mounted on the left ends of the two reciprocating screw rods 802. A power belt 806 is commonly sleeved between the two driven pulleys 803 and the driving pulley 805.

[0046] Specifically, the output shaft of the power motor 804 drives the active pulley 805 to rotate, and further drives the two driven pulleys 803 to rotate together under the transmission action of the power belt 806. The rotation of the two driven pulleys 803 drives the two reciprocating screw rods 802 to rotate, so that the two reciprocating wire sleeves 807 connected to the two reciprocating screw rods 802 by threaded cooperation move back and forth left and right. The reciprocating movement of the two reciprocating wire sleeves 807 drives the sample making square groove 401 to reciprocate left and right together.

[0047] Furthermore, the power motor 804 is located on the outside of one of the exhaust one-way valves 509. When the sample preparation square groove 401 moves to the left or right, it drives the fixed rod 506 and the pressure head 507 to move together. The left and right movement of the pressure head 507 generates a downward thrust on the top of the V-shaped pressure strip 504, compressing the two pressure rods 503 and the square piston 502 downward, and discharging the air inside the square cylinder 501 to the outside through the left and right exhaust holes 508 and the exhaust one-way valve 509, causing a blowing effect on the surface of the power motor 804, which can take away the heat on the surface of the power motor 804 and improve the heat dissipation effect of the power motor 804.

[0048] Furthermore, two fixed bent frames 10 symmetrically distributed on the left and right are fixedly installed on the top of a guide rail 3 located at the rear end, and the ends of the fixed bent frames 10 away from the guide rail 3 are fixedly connected to the side walls of the connecting air head 5013, and the front sides of the two fixed bent frames 10 are commonly connected to a cross beam 11, and the fixed magnetic block 4016 is connected to the cross beam 11 through a fixed bracket. By setting two fixed bent frames 10, it is used to fix and limit the connecting air head 5013, and the two fixed bent frames 10 play a role in fixing and connecting the cross beam 11, and further achieves a fixed limiting effect on the fixed magnetic block 4016.

[0049] When the sample preparation device for food safety testing of this solution is in operation, fruit and vegetable foods are placed inside the sample preparation square groove 401 and located in the area on one side away from the two interception plates 702, so that the two interception plates 702 play a role of isolation, and the fruits and vegetables will not move to the middle of the sample preparation square groove 401;

[0050] The power motor 804 is started, and the output shaft of the power motor 804 drives the active pulley 805 to rotate, and further drives the two driven pulleys 803 to rotate together under the transmission action of the power belt 806. The rotation of the two driven pulleys 803 drives the two reciprocating screw rods 802 to rotate, so that the two reciprocating wire sleeves 807 connected to the two reciprocating screw rods 802 by threaded cooperation move back and forth left and right, and the two reciprocating wire sleeves 807 reciprocate left and right to drive the sample making square groove 401 to move back and forth left and right together. Since the sample making square groove 401 is slidably connected to the two guide rails 3 through the two sliders 402, the reciprocating movement of the sample making square groove 401 can be made more stable and smooth. It should be noted that the bottom of the sample making square groove 401 is a V-shaped inclined structure, which will cause the bottom of the resin roller 407 to be pushed upward by the inclined surface of the bottom wall of the sample making square groove 401 during the movement of the sample making square groove 401 left and right, driving the two hollow shafts. The sleeve 406 and the sliding seat 404 move upward, and the upward movement of the sliding seat 404 causes the first spring 405 to be stretched and stored. When the sample preparation square groove 401 moves toward the middle, the resin roller 407 is reset downward under the action of the rebound force of the first spring 405, so that when the sample preparation square groove 401 of the device moves left and right, the bottom of the resin roller 407 can always be closely attached to the bottom wall of the sample preparation square groove 401, thereby 1, the fruits and vegetables inside are crushed to crush out the juice in the fruits and vegetables, and the crushed juice flows to the middle part of the sample preparation square groove 401 along the bottom wall of the sample preparation square groove 401 and the inner wall slope of the guide hole 703 under the action of gravity, while the crushed fruit and vegetable residues will not move to the middle of the sample preparation square groove 401 due to the blocking effect of the interception plate 702, so that the fruit and vegetable residues and the juice are effectively separated, so that the fruit and vegetable residues and the fruit and vegetable juice are separately sampled;

[0051] At the same time, during the left-right movement of the sample preparation square groove 401, the swing rack 903 is also driven to move together through the connection between the fixed pick plate 902, the telescopic column 905 and the connecting angle code 904. The movement of the swing rack 903 drives the gear 901 meshing therewith to rotate. The rotation of the gear 901 drives the resin roller 407 to rotate through the hollow shaft sleeve 406, and under the elastic force of the fifth spring 906, it can be ensured that the swing rack 903 is always meshed with the gear 901. It should be noted that the specifications of the gear 901 and the swing rack 903 are adaptively set to ensure that the rotation speed of the resin roller 407 is adapted to the left-right movement of the sample preparation square groove 401, and to ensure that there is no relative sliding between the outer wall of the resin roller 407 and the bottom wall of the sample preparation square groove 401, and the outer wall of the resin roller 407 is always in rolling contact with the bottom wall of the sample preparation square groove 401.

[0052] When the sample preparation square groove 401 moves to the left or right, it also drives the fixed rod 506 to move together with the pressure head 507. The left and right movement of the pressure head 507 generates a downward thrust on the top of the V-shaped pressure strip 504, compressing the two pressure rods 503 together with the square piston 502 downward. During this period, the two third springs 505 are compressed and stored, and the square piston 502 is compressed downward, and the air inside the square cylinder 501 is discharged to the outside through the left and right exhaust holes 508 and the exhaust check valve 509. Due to the one-way blocking effect of the suction check valve 5011, the air inside the square cylinder 501 will not enter the interior of the suction pipe 5012. At the same time, the air discharged through the exhaust check valve 509 will also cause a blowing effect on the surface of the power motor 804, which can The heat on the surface of the machine 804 is taken away, and the heat dissipation effect of the power motor 804 is improved. As the sample preparation square groove 401 moves toward the middle, the fixing rod 506 and the pressure head 507 are driven to move toward the middle. The resilience of the two third springs 505 pushes the V-shaped pressure strip 504 to gradually reset upward. The V-shaped pressure strip 504 resets upward and drives the two pressure rods 503 together with the square piston 502 to move upward. At this time, due to the one-way blocking effect of the two exhaust check valves 509, negative pressure is generated inside the square cylinder 501. The negative pressure is transmitted to the connection head 5013 and the inside of the liquid accumulation bottle 6 through the suction check valve 5011 and the suction pipe 5012. The negative pressure inside the liquid accumulation bottle 6 is then transmitted to the inside of the hollow shaft sleeve 406 and the central cavity 4007 through the suction hose 4015;

[0053] When the sample preparation square groove 401 moves to the middle position of the two guide rails 3, the resin roller 407 drives the multiple adsorption cavities 408 to rotate to a vertical downward state, and the driven magnetic block 4013 rotates to the bottom of the fixed magnetic block 4016 with the resin roller 407. Since the magnetic properties of the fixed magnetic block 4016 and the driven magnetic block 4013 are opposite, the fixed magnetic block 4016 will generate an upward magnetic attraction on the driven magnetic block 4013, causing the driven magnetic block 4013 to move upward along the inner wall of the sliding cavity 4012 to compress the second spring 4014, and the upward movement of the driven magnetic block 4013 also drives multiple plunger rods 4010 moves upward together with the multiple sealing rings 4011, so that the multiple sealing rings 4011 slide out from the top of the multiple adsorption cavities 408. At this time, the multiple adsorption cavities 408 and the interior of the central cavity 4007 produce a conductive effect, and the negative pressure condition inside the central cavity 4007 is transmitted to the interior of the multiple adsorption cavities 408, and the fruit and vegetable juices that converge into the middle of the sample preparation square groove 401 are sucked into the interior of the central cavity 4007 through the multiple adsorption cavities 408, and then sucked into the interior of the connecting air head 5013 through the hollow shaft sleeve 406 and the liquid suction hose 4015, and then flow into the interior of the liquid accumulation bottle 6 for collection.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sample preparation device for food safety testing, Features: It comprises a fixed bottom plate (1), wherein two columns (2) distributed on the left and right are fixedly mounted on the front and rear of the fixed bottom plate (1), wherein guide rails (3) are fixedly mounted on the tops of the two columns (2) located at the front and the tops of the two columns (2) located at the rear, and there are two guide rails (3), and a sample preparation component is movably arranged between the two guide rails (3); The sample preparation component comprises a sample preparation square groove (401) located between two guide rails (3), a slider (402) is fixedly installed at the front and rear of the sample preparation square groove (401), the slider (402) is slidably connected to the guide rail (3), two guide rods (403) distributed left and right are fixedly installed at the top of the guide rail (3), a sliding seat (404) is slidably installed on the periphery of the two guide rods (403), a first spring (405) is sleeved on the periphery of the guide rod (403), the first spring (405) is fixedly installed between the top of the guide rail (3) and the bottom of the sliding seat (404), there are two sliding seats (404), and the two sliding seats (404) are distributed front and back, and the two sliding seats (404) are arranged on the top of the guide rail (3). A hollow shaft sleeve (406) is rotatably mounted inside the sliding seat (404), a resin roller (407) is fixedly mounted between the two hollow shaft sleeves (406), the bottom of the resin roller (407) is in contact with the bottom wall of the sample preparation square groove (401), a central cavity (4007) is penetrated through the interior of the resin roller (407), a plurality of adsorption cavities (408) distributed front and back are formed on the outer wall of the resin roller (407), the plurality of adsorption cavities (408) are connected to the interior of the central cavity (4007), a liquid suction hose (4015) is fixedly mounted on the rear end of one of the hollow shaft sleeves (406) located at the rear, the interior of the liquid suction hose (4015) is connected to the hollow shaft sleeve (406), and the liquid suction hose (4015) is connected to the hollow shaft sleeve (406). 06), the interior of the resin roller (407) is provided with a cut-off component, the cut-off component includes a plurality of telescopic holes (409) opened in the resin roller (407), the plurality of telescopic holes (409) are distributed front to back, the interior of the telescopic holes (409) is connected to the interior of the central cavity (4007), the positions of the telescopic holes (409) correspond one to one with the positions of the adsorption cavity (408), the interior of the telescopic holes (409) is slidably mounted with a plunger rod (4010), one end of the plunger rod (4010) close to the adsorption cavity (408) is fixedly mounted with a sealing ring (4011), the interior of the resin roller (407) is provided with a sliding cavity (4012), the sliding cavity (4012) is located at one end of the telescopic hole (409) away from the central cavity (4007), and the sliding cavity (4012) is connected to the inside of the plurality of telescopic holes (409), a driven magnetic block (4013) is slidably installed inside the sliding cavity (4012), and a side of the driven magnetic block (4013) close to the plunger rod (4010) is fixedly connected to the end of the plunger rod (4010), a fixed magnetic block (4016) is fixedly provided on the top of the sample preparation square groove (401), and the magnetism of the fixed magnetic block (4016) is opposite to that of the driven magnetic block (4013), and a side of the driven magnetic block (4013) away from the plunger rod (4010) is fixedly installed with two second springs (4014) distributed front and back,One end of the second spring (4014) away from the driven magnetic block (4013) is fixedly connected to an inner wall of one side of the sliding cavity (4012), and a negative pressure component is fixedly provided on the top of the fixed bottom plate (1); The negative pressure component comprises a square cylinder (501) fixedly mounted on the top of the fixed bottom plate (1); a square piston (502) is slidably mounted on the inner wall of the square cylinder (501); two left and right pressure rods (503) are fixedly mounted on the top of the square piston (502); a V-shaped pressure strip (504) is fixedly mounted on the top of the two pressure rods (503); a third spring (505) is sleeved on the outer periphery of the pressure rod (503); the third spring (505) is fixedly mounted between the top of the square cylinder (501) and the bottom of the V-shaped pressure strip (504); a fixing rod (506) is fixedly mounted on the bottom of the sample preparation square groove (401); a pressure head (507) is fixedly mounted on the bottom of the fixing rod (506); the bottom of the pressure head (507) abuts against the top of the V-shaped pressure strip (504); the left and right parts of the square cylinder (501) are both penetrated An exhaust hole (508) is provided through the square cylinder (501), and an exhaust check valve (509) is fixedly installed on the periphery of the opening of the exhaust hole (508); an air intake hole (5010) is provided through the rear of the square cylinder (501), and an air intake check valve (5011) is fixedly installed on the periphery of the opening of the air intake hole (5010); an air intake pipe (5012) is fixedly installed on the end of the air intake check valve (5011) away from the air intake hole (5010); an air connection head (5013) is fixedly installed on the end of the air intake pipe (5012) away from the air intake check valve (5011); a liquid accumulation bottle (6) is screwed on the bottom thread of the air connection head (5013); an end of the liquid suction hose (4015) away from the hollow shaft sleeve (406) is fixedly connected to the side of the connecting air head (5013), and the interior of the liquid suction hose (4015) is connected to the interior of the connecting air head (5013).

2. A sample preparation device for food safety testing according to claim 1, Features: A driving component is provided on the top of the fixed base plate (1), and the driving component comprises a bearing seat (801) fixedly mounted on the surface of the column (2). The number of the bearing seats (801) is four, and a reciprocating screw rod (802) is rotatably mounted between two left and right bearing seats (801). The reciprocating screw rod (802) is located at the bottom of the sample preparation square groove (401), and the outer wall of the reciprocating screw rod (802) is connected to a reciprocating screw sleeve (807) through threaded engagement. The top of the reciprocating thread sleeve (807) is fixedly connected to the bottom of the sample preparation square groove (401); a power motor (804) is fixedly mounted on the left end of the top of the fixed bottom plate (1); a driving pulley (805) is fixedly mounted on the output shaft of the power motor (804); a driven pulley (803) is fixedly mounted on the left ends of the two reciprocating thread rods (802); and a power belt (806) is commonly sleeved between the two driven pulleys (803) and the driving pulley (805).

3. A sample preparation device for food safety testing according to claim 2, Features: The front and rear parts of the sample preparation square groove (401) are both provided with driven components, and the driven components include a gear (901) fixedly mounted on the outer wall of the hollow shaft sleeve (406). The front and rear parts of the sample preparation square groove (401) are both fixedly mounted with two fixed lifting plates (902) distributed on the left and right. Telescopic columns (905) are slidably mounted inside the two fixed lifting plates (902). The tops of the two telescopic columns (905) are both fixedly mounted with connecting angle brackets (904). The outer periphery of the column (905) is sleeved with a fifth spring (906), and the fifth spring (906) is fixedly installed between the top of the fixed pick plate (902) and the bottom of the connecting angle code (904). A swing rack (903) is fixedly installed between the two connecting angle codes (904) on one side close to the sample preparation square groove (401). The swing rack (903) is located at the bottom of the gear (901), and the swing rack (903) and the gear (901) are meshed with each other.

4. A sample preparation device for food safety testing according to claim 3, Features: The power motor (804) is located outside one of the exhaust one-way valves (509).

5. A sample preparation device for food safety testing according to claim 4, Features: Two interception components distributed on the left and right are arranged inside the sample preparation square groove (401), and the interception components include a slide groove (701) opened at the bottom of the sample preparation square groove (401), an interception plate (702) is slidably installed inside the slide groove (701), and a plurality of guide holes (703) distributed vertically and horizontally are penetrated inside the interception plate (702), and two spring holders (704) distributed front and back are fixedly installed at the bottom of the interception plate (702), and a fourth spring (705) is fixedly installed between the tops of the two spring holders (704) and the bottom of the sample preparation square groove (401).

6. A sample preparation device for food safety testing according to claim 5, Features: Two fixed curved frames (10) symmetrically distributed on the left and right are fixedly installed on the top of one of the guide rails (3) located at the rear end, and the ends of the fixed curved frames (10) away from the guide rail (3) are fixedly connected to the side walls of the connecting air head (5013), and the front faces of the two fixed curved frames (10) are commonly connected to a crossbeam (11), and the fixed magnetic block (4016) is connected to the crossbeam (11) via a fixed bracket.

7. A sample preparation device for food safety testing according to claim 6, Features: An O-type airtight gasket is provided between the liquid accumulation bottle (6) and the connecting gas head (5013).

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