A sample preparation device for batch agricultural product detection

Abstract

The application relates to the technical field of agricultural product detection, in particular to a batch agricultural product detection sample preparation device, which comprises a rack and a separation cylinder installed in the rack. The outer wall of the separation cylinder is connected with a feeding port. A filter plate is installed in the separation cylinder. A liquid outlet pipe is connected with the bottom end of the separation cylinder. An extrusion mechanism is arranged in the separation cylinder. The extrusion mechanism comprises an installation groove arranged in the separation cylinder. A vertical rod is installed in the installation groove. A pressing plate is slid on the outer wall of the vertical rod. A spring is arranged on the outer wall of the vertical rod. A stress plate is fixed to the top end of the pressing plate. A rotating shaft is arranged on the inner wall of the separation cylinder and located above the stress plate. In the application, the loose needle is inserted into the filter hole of the filter plate during the movement process, the agricultural product residues accumulated on the surface of the filter plate are lifted and loosened, the filter hole is effectively prevented from being blocked by the residues, the filter hole is kept unblocked, and the normal penetration of the juice is maintained.

Description

Technical Field

[0001] This invention relates to the field of agricultural product testing technology, and in particular to a sample preparation device for batch agricultural product testing. Background Technology

[0002] In the field of agricultural product quality and safety testing, sample pretreatment is a crucial step that determines the accuracy and reliability of test results. Among these, the extraction and preparation of agricultural product juices is a core preliminary step for many testing projects, such as pesticide residue detection and nutritional component analysis. With the continuous development of modern agriculture on a large scale and the increasing intensity of food safety supervision, testing institutions are facing a continuous increase in the number of agricultural product samples, which places increasingly stringent requirements on the batch processing capacity, extraction efficiency, and adaptability of sample preparation equipment.

[0003] However, agricultural products will generate a lot of residue after being squeezed. This residue is very easy to adhere to the surface of the filter plate pores and gradually accumulate to form a dense filter residue layer. Traditional devices lack an effective unclogging mechanism. After the filter pores are blocked, the juice penetration rate will drop sharply, and the sample preparation time per batch will be extended.

[0004] In view of this, we have studied and improved the existing problems to provide a batch sample preparation device for agricultural product testing. The aim of this technology is to solve the problems and improve its practical value. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a sample preparation device for batch testing of agricultural products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a batch agricultural product testing sample preparation device, comprising a frame and a separation cylinder installed inside the frame, the outer wall of the separation cylinder being connected to a feed inlet, the interior of the separation cylinder being equipped with a filter plate, the bottom end of the separation cylinder being connected to a liquid outlet pipe, the interior of the separation cylinder being provided with a squeezing mechanism, the squeezing mechanism including an installation groove opened inside the separation cylinder, a vertical rod being installed inside the installation groove, a pressure plate slidingly attached to the outer wall of the vertical rod, a spring sleeved on the outer wall of the vertical rod, a force-bearing plate fixed to the top of the pressure plate, a rotating shaft rotatably mounted on the inner wall of the separation cylinder above the force-bearing plate, and a cam A sleeved on the outer wall of the rotating shaft; A negative pressure mechanism is provided below the filter plate. The negative pressure mechanism includes a frame plate that slides inside the separation cylinder. Multiple sets of equally spaced needle plates are fixed inside the frame plate. A loosening needle is fixed at the top of the needle plate. Sliding grooves are provided around the bottom of the frame plate. Sliding blocks slide inside the sliding grooves. A round rod is fixed between two sets of sliding blocks. A sealing plate rotates between two sets of round rods. A top rod is fixed at the bottom of the filter plate. The top rod abuts against the sealing plate. The outer wall of the separation cylinder is equipped with an air blowing mechanism.

[0007] Preferably, one end of the spring is fixedly connected to the bottom end of the pressure plate, and the other end of the spring is fixedly connected to the inner wall of the mounting groove.

[0008] Preferably, the sealing sheet is located between two adjacent sets of needle plates, and the sealing sheet is made of rubber material.

[0009] Preferably, the negative pressure mechanism further includes a cam B sleeved on one end of the rotating shaft, one end of the cam B is fixed with a protrusion, the outer wall of the protrusion is sleeved with a rocker arm, the outer wall of the frame plate is fixed with a slide rod, and the other end of the cam B is sleeved on the outer wall of the slide rod.

[0010] Preferably, the outer wall of the separation cylinder is provided with a sealing groove, a sealing plate slides inside the sealing groove, and one end of the slide rod passes through the outer wall of the sealing plate.

[0011] Preferably, the blowing mechanism includes a sleeve fixed to the outer wall of the separator cylinder, a piston rod fixed to the top of the pressure plate, the piston rod sliding inside the sleeve, an air intake pipe connected to the outer wall of the sleeve, an exhaust pipe connected to the top of the sleeve, a horizontal pipe connected to one end of the exhaust pipe, and an air outlet shell connected to one end of the horizontal pipe via a connecting pipe.

[0012] Preferably, a vertical pipe is connected to the lower part of the horizontal pipe, the vertical pipe is fixedly installed on the outer wall of the separation cylinder, a U-shaped rod slides inside the vertical pipe, one end of the U-shaped rod is fixed to the bottom end of the frame plate, a limiting groove is opened on the outer wall of the separation cylinder, and the U-shaped rod slides along the axial direction of the limiting groove.

[0013] Preferably, the intake pipe is equipped with a one-way intake valve, the exhaust pipe is equipped with a one-way exhaust valve, and both the intake pipe and the exhaust pipe are made of stainless steel.

[0014] Preferably, the inner wall of the frame is fixed with a placement rack, and the placement rack is provided with multiple sets of collection bottles.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, after the pressure plate contacts the agricultural product, the spring sleeved on the outer wall of the vertical rod gradually compresses with the pressing stroke of the pressure plate. This allows for adaptive pressure adjustment based on the hardness differences of the agricultural product. If processing hard agricultural products such as root vegetables, the material's reaction force on the pressure plate is greater, and the spring compression will increase accordingly. This greater deformation buffers the pressure peak during the pressing process, effectively preventing damage to the pressure plate and filter plate due to excessive instantaneous pressure. If processing softer agricultural products such as leafy vegetables, the material's reaction force is smaller, and the spring compression decreases accordingly. In this case, the spring's elastic restoring force ensures that the pressure plate applies sufficient pressing pressure to the material, guaranteeing full extraction of juice. This solves the problem of poor adaptability of traditional devices to materials of different hardness. At the same time, the spring's buffering effect effectively reduces the impact of the pressure plate's movement, preventing juice from splashing due to excessive instantaneous force during the pressing process. This reduces juice loss, maintains the cleanliness of the internal environment of the device, and lowers subsequent cleaning costs.

[0016] 2. This invention uses a loosening needle inserted into the filter holes of a filter plate during its movement to lift and loosen the agricultural product residue accumulated on the surface of the filter plate. This effectively prevents the residue from clogging the filter holes, ensuring unobstructed flow and maintaining normal juice penetration. Simultaneously, a sealing sheet tightly adheres to the bottom of the frame plate, completely sealing the gap between the needle and the plate. Once the frame plate is sealed, the swing rod continues to move the frame plate downwards via a sliding rod, increasing the volume of the space below the filter plate inside the separation cylinder. This creates a negative pressure environment, which generates an upward suction force, accelerating the speed at which agricultural product juice passes through the filter holes. This, combined with the squeezing action of the pressure plate, creates a synergistic effect of push and suction, improving the efficiency of juice separation, preventing juice from stagnating on the filter plate surface, and shortening the sample preparation time for a single batch.

[0017] 3. In this invention, when the pressure plate moves downward along the vertical rod, the piston rod moves downward along the inside of the sleeve simultaneously, creating a negative pressure inside the sleeve. Gas is drawn in from the outside through the suction pipe. When the pressure plate moves upward, the piston rod squeezes the gas inside the sleeve. The gas enters the horizontal pipe through the exhaust pipe and is sprayed onto the surface of the filter plate through the gas outlet shell. At the same time, when the frame plate moves upward, it drives the U-shaped rod to move upward along the vertical rod. The U-shaped rod squeezes the gas inside the horizontal pipe, thereby increasing the gas ejection pressure. The high-pressure gas is blown directionally towards the filter cake layer through the gas outlet shell, impacting the dense accumulation layer formed by the filter cake, expanding the gaps between the filter cake particles, breaking the state of the filter cake encapsulating the juice, and further enhancing the penetration of the negative pressure environment, making the juice easier to separate. On the other hand, the gas is blown obliquely downward from the gas outlet shell towards the material, pushing the material to gather towards the center of the separation cylinder, avoiding the material sticking to the wall and forming a squeezing dead corner, ensuring that all materials can be fully squeezed by the pressure plate, and increasing the juice extraction rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is one of the cross-sectional structural schematic diagrams of the separation cylinder of the present invention; Figure 4 This is a second schematic diagram of the cross-sectional structure of the separation cylinder of the present invention; Figure 5 This is one of the partial structural schematic diagrams of the present invention; Figure 6 This is a partial structural schematic diagram of the present invention; Figure 7 This is a schematic diagram of the air blowing mechanism of the present invention; Figure 8 The third part is a schematic diagram of the structure of the present invention.

[0019] Legend: 1. Frame; 2. Separating cylinder; 3. Feed inlet; 4. Filter plate; 5. Discharge pipe; 61. Mounting groove; 62. Pressure plate; 63. Vertical rod; 64. Spring; 65. Force plate; 66. Rotating shaft; 67. Cam A; 71. Frame plate; 72. Needle plate; 73. Loosening needle; 74. Slide groove; 75. Sliding block; 76. Round rod; 77. Sealing plate; 78. Cam B; 79. Swing rod; 710. Slide rod; 711. Top rod; 81. Sleeve; 82. Piston rod; 83. Inhalation pipe; 84. Exhaust pipe; 85. Horizontal pipe; 86. Air outlet shell; 87. U-shaped rod; 88. Vertical pipe; 9. Placement rack; 10. Collection bottle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] See Figures 1 to 8As shown, the present invention provides a sample preparation device for batch agricultural product testing, including a frame 1 and a separation cylinder 2 installed inside the frame 1. The outer wall of the separation cylinder 2 is connected to a feed inlet 3. A filter plate 4 is installed inside the separation cylinder 2. A liquid outlet pipe 5 is connected to the bottom end of the separation cylinder 2. The separation cylinder 2 is provided with a squeezing mechanism. The squeezing mechanism includes an installation groove 61 opened inside the separation cylinder 2. A vertical rod 63 is installed inside the installation groove 61. A pressure plate 62 slides on the outer wall of the vertical rod 63. A spring 64 is sleeved on the outer wall of the vertical rod 63. A force plate 65 is fixed at the top of the pressure plate 62. A rotating shaft 66 located above the force plate 65 is rotatably mounted on the inner wall of the separation cylinder 2. A cam A67 is sleeved on the outer wall of the rotating shaft 66. It should be noted that, firstly, the pre-crushed agricultural raw materials are conveyed from the feed inlet 3 on the outer wall of the separator 2 to the surface of the filter plate 4 inside the separator 2. Then, the motor is started, and the power output of the motor drives the rotating shaft 66 connected to the inner wall of the separator 2 to start rotating. During the rotation of the rotating shaft 66, the cam A67 sleeved on its outer wall moves in a circular motion along its own axis. As the cam A67 rotates, its protruding part gradually contacts the force plate 65 located below and pushes the force plate 65 to move downward. The force plate 65 drives the pressure plate 62 to move in a circular motion along its own axis. The outer wall of the vertical rod 63 slides downward, thereby causing the pressure plate 62 to exert a stable pressure on the agricultural raw materials carried on the surface of the filter plate 4. Under the pressure, the juice inside the agricultural product is fully squeezed out. This juice seeps down through the filter holes on the filter plate 4 and is eventually stored in the cavity at the bottom of the separation cylinder 2. When the juice collected in the separation cylinder 2 reaches a certain amount, the staff controls the opening of the solenoid valve on the liquid outlet pipe 5, and the juice will be diverted to multiple sets of collection bottles 10 through the liquid outlet pipe 5, thereby quickly completing the entire batch sample preparation and effectively improving the efficiency of sample preparation. Meanwhile, when the pressure plate 62 comes into contact with the agricultural product, the spring 64, which is sleeved on the outer wall of the vertical rod 63, will gradually compress with the squeezing stroke of the pressure plate 62. This compression characteristic can achieve adaptive pressure adjustment according to the hardness difference of the agricultural product. If the processed agricultural products are hard, such as root vegetables, the reaction force of the material on the pressure plate 62 is large, and the compression of the spring 64 will increase accordingly. The pressure peak during the squeezing process is buffered by a greater degree of deformation, which effectively prevents the pressure plate 62 and the filter plate 4 from being damaged due to excessive instantaneous pressure. If the processed agricultural products are softer, such as leafy vegetables, the reaction force of the material is small, and the compression of the spring 64 will decrease accordingly. At this time, the elastic restoring force of the spring 64 can ensure that the pressure plate 62 applies sufficient squeezing pressure to the material, ensuring full extraction of juice. This solves the problem of poor adaptability of traditional devices to materials of different hardness. At the same time, the buffering effect of the spring 64 can effectively reduce the impact of the movement of the pressure plate 62, preventing the juice from splashing due to excessive instantaneous force during the squeezing process. This reduces juice loss, keeps the internal environment of the device clean, and reduces subsequent cleaning costs.

[0022] A negative pressure mechanism is provided below the filter plate 4. The negative pressure mechanism includes a frame plate 71 that slides inside the separation cylinder 2. Multiple sets of equally spaced needle plates 72 are fixed inside the frame plate 71. A loosening needle 73 is fixed at the top of the needle plate 72. Sliding grooves 74 are provided around the bottom of the frame plate 71. Sliding sliders 75 slide inside the sliding grooves 74. A round rod 76 is fixed between two sets of sliding sliders 75. A sealing plate 77 rotates between two sets of round rods 76. A top rod 711 is fixed at the bottom of the filter plate 4. The top rod 711 abuts against the sealing plate 77. It should be noted that while the rotating shaft 66 drives the cam A67 to move, the cam B78 fitted at one end of it also rotates. The protrusion at the end of the cam B78 forms a transmission cooperation with the slide rod 710 through the rocker arm 79, which drives the slide rod 710 to slide vertically up and down along the sealing groove on the outer wall of the separation cylinder 2. The slide rod 710 is fixedly connected to the frame plate 71, so it will synchronously drive the frame plate 71 to move up and down inside the separation cylinder 2. The frame plate 71 then drives the multiple sets of needle plates 72 fixed inside it and the loosening needles 73 at the top of the needle plates 72 to move synchronously, so that the array of loosening needles 73 performs a reciprocating insertion action under the filter plate 4. During the movement, the loosening needles 73 insert into the filter holes of the filter plate 4, lift up and loosen the agricultural product residues accumulated on the surface of the filter plate 4, effectively prevent the residues from clogging the filter holes, and ensure that the filter holes are unobstructed to maintain the normal penetration of the juice. In the initial state, the sealing sheet 77 inside the frame plate 71 is in a bent state. When the swing rod 79 moves the frame plate 71 downward, the sealing sheet 77 moves downward synchronously with the frame plate 71. During this process, it gradually moves away from the top rod 711 fixed at the bottom of the filter plate 4. The sealing sheet 77, which loses the abutment of the top rod 711, gradually returns to its original position under its own elastic force, pushing the round rod 76 to drive the slider 75 to slide along the inside of the slide groove 74. Finally, the sealing sheet 77 is tightly attached to the bottom of the frame plate 71, completely sealing the gap between the needle plate 72. After the frame plate 71 is sealed, the swing rod 79 will continue to move the frame plate 71 downward a certain distance through the slide rod 710, increasing the volume of the space below the filter plate 4 inside the separation cylinder 2, thereby forming a negative pressure environment. This negative pressure environment will generate an upward suction force, accelerating the speed at which the agricultural product juice passes through the filter holes. It forms a push-suction synergistic effect with the squeezing action of the pressure plate 62, improving the efficiency of juice separation, avoiding juice retention on the surface of the filter plate 4, and shortening the sample preparation time for a single batch.

[0023] The outer wall of the separator 2 is equipped with an air blowing mechanism.

[0024] In an optional embodiment, one end of the spring 64 is fixedly connected to the bottom end of the pressure plate 62, and the other end of the spring 64 is fixedly connected to the inner wall of the mounting groove 61.

[0025] In an optional embodiment, the sealing sheet 77 is located between two adjacent sets of needle plates 72. The sealing sheet 77 is made of rubber material. The sealing sheet 77 is located between adjacent needle plates 72 and can seal the gap between the needle plates 72. With the frame plate 71 moving down, a negative pressure environment is formed inside the separation cylinder 2 to accelerate juice separation. Its rubber material has both elasticity and sealing properties, and can adapt to the movement of the frame plate 71 to achieve reliable sealing and avoid juice leakage or negative pressure failure.

[0026] In an optional embodiment, the negative pressure mechanism further includes a cam B78 sleeved on one end of the rotating shaft 66. One end of the cam B78 is fixed with a protrusion, and a rocker arm 79 is sleeved on the outer wall of the protrusion. A slide rod 710 is fixed on the outer wall of the frame plate 71, and the other end of the cam B78 is sleeved on the outer wall of the slide rod 710.

[0027] In an optional embodiment, a sealing groove is provided on the outer wall of the separating cylinder 2, and a sealing plate slides inside the sealing groove. One end of the slide rod 710 extends through the outer wall of the sealing plate, and the slide rod 710 slides stably along the sealing groove to drive the frame plate 71 to move, maintain the sealing environment required by the negative pressure mechanism, and ensure stable negative pressure effect.

[0028] In an optional embodiment, the blowing mechanism includes a sleeve 81 fixed to the outer wall of the separator 2, a piston rod 82 fixed to the top of the pressure plate 62, the piston rod 82 sliding inside the sleeve 81, an air intake pipe 83 connected to the outer wall of the sleeve 81, an exhaust pipe 84 connected to the top of the sleeve 81, a horizontal pipe 85 connected to one end of the exhaust pipe 84, and an air outlet shell 86 connected to one end of the horizontal pipe 85 via a connecting pipe.

[0029] In an optional embodiment, a vertical pipe 88 is connected to the lower part of the horizontal pipe 85. The vertical pipe 88 is fixedly installed on the outer wall of the separation cylinder 2. A U-shaped rod 87 slides inside the vertical pipe 88. One end of the U-shaped rod 87 is fixed to the bottom end of the frame plate 71. A limiting groove is opened on the outer wall of the separation cylinder 2, and the U-shaped rod 87 slides along the axial direction of the limiting groove.

[0030] In an optional embodiment, the intake pipe 83 is provided with a one-way intake valve, and the exhaust pipe 84 is provided with a one-way exhaust valve. Both the intake pipe 83 and the exhaust pipe 84 are made of stainless steel. The one-way intake valve built into the intake pipe 83 and the one-way exhaust valve built into the exhaust pipe 84 can ensure one-way gas flow.

[0031] It should be noted that when the pressure plate 62 moves downward along the vertical rod 63, the piston rod 82 fixed at its top moves downward along the inside of the sleeve 81, creating a negative pressure inside the sleeve 81. Gas is then drawn in from the outside through the suction pipe 83. When the pressure plate 62 moves upward, the piston rod 82 compresses the gas inside the sleeve 81. The gas enters the horizontal pipe 85 through the exhaust pipe 84 and is finally sprayed onto the surface of the filter plate 4 through the exhaust shell 86. At the same time, when the frame plate 71 moves upward, it drives the U-shaped rod 87 to move upward along the vertical rod 63. The U-shaped rod 87 compresses the horizontal pipe 85. The gas inside the cylinder 5 increases the gas ejection pressure. On the one hand, the high-pressure gas is blown directionally towards the filter cake layer through the gas outlet shell 86, impacting the dense accumulation layer formed by the filter cake, expanding the gaps between the filter cake particles, breaking the filter cake's encapsulation of the juice, and further enhancing the penetration of the negative pressure environment, making the juice easier to separate. On the other hand, the gas is blown obliquely downward from the gas outlet shell 86 towards the material, pushing the material to gather towards the center of the separation cylinder 2, avoiding the material from sticking to the wall and forming a squeezing dead corner, ensuring that all materials can be fully squeezed by the pressure plate 62, and increasing the juice extraction rate.

[0032] In an optional embodiment, a placement rack 9 is fixed to the inner wall of the frame 1, and multiple sets of collection bottles 10 are provided inside the placement rack 9.

[0033] Working principle: First, the pre-crushed agricultural raw materials are transported from the feed inlet 3 on the outer wall of the separator cylinder 2 to the surface of the filter plate 4 inside the separator cylinder 2. Then, the motor is started, and the power output of the motor drives the rotating shaft 66 connected to the inner wall of the separator cylinder 2 to start rotating. During the rotation of the rotating shaft 66, the cam A67 sleeved on its outer wall moves in a circular motion along its own axis. As the cam A67 rotates, its protruding part gradually contacts the force plate 65 located below and pushes the force plate 65 to move downward. The force plate 65 drives the pressure plate 62 to slide downward along the outer wall of the vertical rod 63, thereby making the pressure plate 62 form a stable squeeze on the agricultural raw materials carried on the surface of the filter plate 4. Under the action of squeezing, the juice inside the agricultural products is fully squeezed out. This juice seeps downward through the filter holes on the filter plate 4 and is finally stored in the cavity at the bottom of the separator cylinder 2. When the juice collected in the separator cylinder 2 reaches a certain amount, the operator opens the solenoid valve on the liquid outlet pipe 5 by controlling it, and the juice will be diverted to multiple collection bottles 10 through the liquid outlet pipe 5. Meanwhile, when the pressure plate 62 comes into contact with the agricultural product material, the spring 64 sleeved on the outer wall of the vertical rod 63 will gradually compress with the squeezing stroke of the pressure plate 62. This compression characteristic can achieve adaptive pressure adjustment according to the hardness difference of the agricultural product material. If the processed agricultural products are root vegetables or other agricultural products with higher hardness, the reaction force of the material on the pressure plate 62 is greater, and the compression of the spring 64 will increase accordingly. The pressure peak during the squeezing process is buffered by a greater degree of deformation, which effectively prevents the pressure plate 62 and the filter plate 4 from being damaged due to excessive instantaneous pressure. If the processed agricultural products are leafy vegetables or other agricultural products with softer texture, the reaction force of the material is smaller, and the compression of the spring 64 will decrease accordingly. At this time, the elastic restoring force of the spring 64 can ensure that the pressure plate 62 applies sufficient squeezing pressure to the material, ensuring full extraction of juice. This solves the problem of poor adaptability of traditional devices to materials with different hardness. At the same time, the buffering effect of the spring 64 can effectively reduce the impact of the movement of the pressure plate 62. While the rotating shaft 66 drives the cam A67 to move, the cam B78 sleeved at one end of it also rotates. The protrusion at the end of the cam B78 forms a transmission cooperation with the slide rod 710 through the rocker arm 79, which drives the slide rod 710 to slide vertically up and down along the sealing groove on the outer wall of the separating cylinder 2. The slide rod 710 is fixedly connected to the frame plate 71, so it will synchronously drive the frame plate 71 to move up and down inside the separating cylinder 2. The frame plate 71 also drives the multiple sets of needle plates 72 fixed inside it and the loosening needles 73 at the top of the needle plates 72 to move synchronously, so that the array of loosening needles 73 performs a reciprocating insertion action below the filter plate 4. During the movement, the loosening needles 73 are inserted into the filter holes of the filter plate 4. In the initial state, the sealing sheet 77 inside the frame plate 71 is in a bent state. When the swing rod 79 moves the frame plate 71 downward, the sealing sheet 77 moves downward synchronously with the frame plate 71. During this process, it gradually moves away from the top rod 711 fixed at the bottom of the filter plate 4. The sealing sheet 77, which loses the abutment of the top rod 711, gradually returns to its original position under its own elastic force, pushing the round rod 76 to drive the slider 75 to slide along the inside of the slide groove 74. Finally, the sealing sheet 77 is tightly attached to the bottom of the frame plate 71, completely sealing the gap between the needle plates 72. After the frame plate 71 is sealed, the swing rod 79 will continue to move the frame plate 71 downward a certain distance through the slide rod 710, which increases the volume of the space below the filter plate 4 inside the separation cylinder 2, thereby forming a negative pressure environment. When the pressure plate 62 moves downward along the vertical rod 63, the piston rod 82 fixed at its top moves downward along the inside of the sleeve 81, creating a negative pressure inside the sleeve 81. Gas is then drawn in from the outside through the suction pipe 83. When the pressure plate 62 moves upward, the piston rod 82 squeezes the gas inside the sleeve 81. The gas enters the horizontal pipe 85 through the exhaust pipe 84 and is finally sprayed onto the surface of the filter plate 4 through the outlet shell 86. At the same time, when the frame plate 71 moves upward, it drives the U-shaped rod 87 to move upward along the vertical rod 63. The U-shaped rod 87 squeezes the gas inside the horizontal pipe 85, thereby increasing the gas ejection pressure. The high-pressure gas is blown directionally towards the filter cake layer through the outlet shell 86, impacting the dense accumulation layer formed by the filter cake.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A batch sample preparation device for agricultural product testing, comprising a frame (1) and a separation cylinder (2) installed inside the frame (1), wherein the outer wall of the separation cylinder (2) is connected to a feed inlet (3), a filter plate (4) is installed inside the separation cylinder (2), and a liquid outlet pipe (5) is connected to the bottom end of the separation cylinder (2), characterized in that: The separation cylinder (2) is provided with a squeezing mechanism inside. The squeezing mechanism includes an installation groove (61) opened inside the separation cylinder (2). A vertical rod (63) is installed inside the installation groove (61). A pressure plate (62) slides on the outer wall of the vertical rod (63). A spring (64) is sleeved on the outer wall of the vertical rod (63). A force plate (65) is fixed at the top of the pressure plate (62). A rotating shaft (66) located above the force plate (65) is rotatably connected to the inner wall of the separation cylinder (2). A cam A (67) is sleeved on the outer wall of the rotating shaft (66). A negative pressure mechanism is provided below the filter plate (4). The negative pressure mechanism includes a frame plate (71) that slides inside the separation cylinder (2). Multiple sets of equally spaced needle plates (72) are fixed inside the frame plate (71). A loosening needle (73) is fixed at the top of the needle plate (72). Sliding grooves (74) are provided around the bottom of the frame plate (71). A slider (75) slides inside the sliding groove (74). A round rod (76) is fixed between two sets of sliders (75). A sealing plate (77) rotates between two sets of round rods (76). A top rod (711) is fixed at the bottom of the filter plate (4). The top rod (711) abuts against the sealing plate (77). The outer wall of the separation cylinder (2) is provided with an air blowing mechanism.

2. The sample preparation device for batch agricultural product testing according to claim 1, characterized in that: One end of the spring (64) is fixedly connected to the bottom end of the pressure plate (62), and the other end of the spring (64) is fixedly connected to the inner wall of the mounting groove (61).

3. The sample preparation device for batch agricultural product testing according to claim 1, characterized in that: The sealing sheet (77) is located between two adjacent sets of needle plates (72), and the sealing sheet (77) is made of rubber material.

4. The sample preparation device for batch agricultural product testing according to claim 1, characterized in that: The negative pressure mechanism also includes a cam B (78) sleeved on one end of the rotating shaft (66). One end of the cam B (78) is fixed with a protrusion, and a rocker arm (79) is sleeved on the outer wall of the protrusion. A slide rod (710) is fixed on the outer wall of the frame plate (71), and the other end of the cam B (78) is sleeved on the outer wall of the slide rod (710).

5. The sample preparation device for batch agricultural product testing according to claim 4, characterized in that: The outer wall of the separation cylinder (2) is provided with a sealing groove, and a sealing plate slides inside the sealing groove. One end of the slide rod (710) passes through the outer wall of the sealing plate.

6. The sample preparation device for batch agricultural product testing according to claim 1, characterized in that: The blowing mechanism includes a sleeve (81) fixed to the outer wall of the separator (2), a piston rod (82) fixed to the top of the pressure plate (62), the piston rod (82) sliding inside the sleeve (81), the outer wall of the sleeve (81) is connected to an air intake pipe (83), the top of the sleeve (81) is connected to an exhaust pipe (84), one end of the exhaust pipe (84) is connected to a horizontal pipe (85), and one end of the horizontal pipe (85) is connected to an air outlet shell (86) through a connecting pipe.

7. The sample preparation device for batch agricultural product testing according to claim 6, characterized in that: The horizontal tube (85) is connected to a vertical tube (88) below. The vertical tube (88) is fixedly installed on the outer wall of the separation cylinder (2). A U-shaped rod (87) slides inside the vertical tube (88). One end of the U-shaped rod (87) is fixed to the bottom end of the frame plate (71). A limiting groove is opened on the outer wall of the separation cylinder (2). The U-shaped rod (87) slides along the axial direction of the limiting groove.

8. A sample preparation device for batch agricultural product testing according to claim 6, characterized in that: The intake pipe (83) is equipped with a one-way intake valve, and the exhaust pipe (84) is equipped with a one-way exhaust valve. Both the intake pipe (83) and the exhaust pipe (84) are made of stainless steel.

9. A sample preparation device for batch agricultural product testing according to claim 1, characterized in that: The inner wall of the frame (1) is fixed with a placement rack (9), and the inside of the placement rack (9) is provided with multiple sets of collection bottles (10).

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