A sample screening device

Abstract

The present application relates to the field of screening or sorting solid materials with a sieve, and particularly relates to a sample screening device. The sample screening device comprises a frame, a support platform and a vibrating mechanism arranged on the frame, the vibrating mechanism acting on the support platform, the support platform being provided with a holder, the holder having a mounting cavity for mounting a screening assembly, and the holder being provided with a pressing structure for fixing the screening assembly in the vertical direction, the screening assembly comprising at least two screens stacked in the vertical direction, the mesh density of the bottom of each screen increasing from top to bottom. The material can be gradually subdivided by layering through the mesh during the vibration process, and after the screening is completed, the screening assembly can be taken out of the holder, so that each screen can be poured separately to collect all the materials therein, ensuring that no material is left in the mesh or not discharged through the discharge port during the screening process, effectively reducing material loss and waste, and helping to improve material utilization and test accuracy.

Description

Technical Field

[0001] This invention relates to the field of screening or sorting solid materials using filter screens, and more specifically to a sieving device. Background Technology

[0002] Organic geochemical analysis aims to determine key parameters of source rocks, such as organic matter type, abundance, maturity, hydrocarbon generation potential, and sedimentary environment, and to provide a comprehensive evaluation of the source rocks for hydrocarbon source correlation and migration studies.

[0003] The process involves multiple experimental analysis items, including chloroform bitumen A analysis, vitrinite reflectance determination, kerogen microstructure and type classification, organic element analysis, organic carbon and pyrolysis experiments, etc. Each item sets specific requirements for the analysis and testing of rock samples, covering all aspects such as sampling, crushing, sieving, and testing. Among them, crushing and sieving are key steps in rock sample preparation, aiming to process the collected rock samples into powdered experimental samples that meet the requirements of each experimental analysis item. Different experimental analysis items have specific requirements for the quality and mesh size (particle size) of the powdered experimental samples. For example, organic carbon, pyrolysis, and chloroform bitumen A analysis require samples to be crushed to a mesh size of 100 or higher, while vitrinite reflectance determination requires the powdered experimental sample before kerogen separation to be 40 mesh, and kerogen microstructure and type classification and organic element analysis require 80 mesh. Currently, rock sample preparation typically uses a jaw crusher for coarse crushing, followed by an impact crusher for fine crushing, and finally sieving to obtain powdered experimental samples that meet the testing requirements.

[0004] Existing technology, such as the Chinese utility model patent with authorization announcement number CN216460011U, discloses a grading and screening device for feed production. Specifically, it discloses a base, with a grading and screening component connected to the base via a vibration structure. The vibration structure includes support plates symmetrically fixed to the upper surface of the base, a support member between the two support plates, and crossbars symmetrically fixed to both sides of the support member. Several springs A are provided between the left and right sides of the support member and the support plates. A lifting block is provided inside the support member, and several vertical rods are symmetrically arranged inside the support member. The lifting block is slidably mounted on the vertical rods, and several springs B are provided between the upper and lower sides of the lifting block and the support member. A support platform is fixed to the upper surface of the lifting block, and the grading and screening component is mounted on the support platform. The grading and screening component includes several vertically mounted ethylene sorting screens, with the sorting accuracy increasing sequentially from top to bottom, and each sorting screen having a discharge port on its side. A drive motor is located inside the lifting block, and the output end of the drive motor is connected to a rotating deflector. During operation, the drive motor drives the rotating impeller to rotate. When the impeller rotates, it applies a force to the lifting block, causing the lifting block to move in a circular motion along the crossbar, spring A, spring B, and support components. The grading and screening components on the support platform also move in a circular motion, vibrating and screening the materials in the grading and screening components from all directions. At the same time, the materials that fall into different sorting screens after screening fall out of the discharge port on the side of the sorting screen for easy collection by the operator.

[0005] In the process of material screening, the materials that are far from the discharge port have more difficulty moving towards the discharge port. During the screening process, some materials will always fail to be discharged smoothly from the discharge port. In fact, the materials may even block the mesh of the screen, which further aggravates the loss of materials during the screening process and affects the accuracy and efficiency of analysis and testing. Summary of the Invention

[0006] The purpose of this invention is to provide a sieving device to solve the problem that existing grading and screening equipment cannot completely collect the materials after screening, resulting in serious material loss.

[0007] To achieve the above objectives, the technical solution of the sieving device provided by the present invention is as follows: the sieving device includes a frame, a support platform and a vibration mechanism are provided on the frame, the vibration mechanism acts on the support platform, a fixture is provided on the support platform, the fixture has an installation cavity for installing the screening components, and the fixture is provided with a clamping structure for fixing the screening components vertically, the screening components include at least two screens stacked together in the vertical direction, and the screen density of each screen increases sequentially from top to bottom.

[0008] As a further improvement, the side of the fixture is provided with an operating port for the operator to move the screening component upward through the operating port.

[0009] As a further improvement, the support platform is a support plate, the fixture is a fixed cylinder fixed on the support platform, the screener includes a cylindrical body that is clearance-fitted with the fixed cylinder, the bottom of the cylindrical body has a screen, and the uppermost screener in the screening assembly is also equipped with a pressure cap.

[0010] As a further improvement, a square window is provided on the circumference of the fixed cylinder to form the operation port, and the bottom of the square window is located near the bottom of the fixed cylinder.

[0011] As a further improvement, the clamping structure includes hanging rings fixed on the side walls of opposite sides of the fixed cylinder, with a tension rope connected to one side of the hanging ring and a locking hook connected to the other end of the tension rope. The tension rope passes around the upper opening of the fixed cylinder so that the locking hook is hooked onto the hanging ring on the other side.

[0012] As a further improvement, the vibration mechanism is a rotary motion mechanism used to drive the support plate to make rotary motion. A vertical buffer structure is provided inside the fixed cylinder. The buffer structure includes a compression spring fixed on the support plate. The other end of the compression spring is fixed to the screen plate. The mounting cavity is the space on the upper side of the screen plate.

[0013] As a further improvement, multiple fixed cylinders are evenly arranged on the support platform, and the square windows on each fixed cylinder face the same side.

[0014] As a further improvement, the vibration mechanism includes a speed-regulating motor fixed on the frame, an eccentric disk connected to the output end of the speed-regulating motor, and the other end of the eccentric disk rotatably mounted on the active rotating platform, on which a support platform is fixed.

[0015] As a further improvement, a mounting bracket is provided inside the frame, and the active rotating platform is an active rotating plate set on the upper side of the mounting bracket. The top plate of the mounting bracket and the active rotating plate are respectively provided with a first and a second mounting structure. The output end of the speed regulating motor passes through the first mounting structure and is connected to an eccentric disk. The drive shaft at the other end of the eccentric disk is connected to the active rotating plate through the second mounting structure.

[0016] As a further improvement, a third and fourth mounting structure are respectively provided on the top plate of the mounting bracket and the active rotating plate on the periphery of the first and second mounting structures, and a combined connecting rod is assembled between the third and fourth mounting structures.

[0017] The beneficial effects are as follows: This invention provides an improved sieving device based on existing technology. The cooperation of the fixing device and the clamping structure ensures that multiple stacked screens remain tightly fixed during the sieving process, effectively avoiding gaps between adjacent screens, thereby preventing material spillage and cross-contamination, and ensuring the accuracy and reliability of the sieving results. After sieving, the screening components can be removed from the fixing device, and each screen can be individually emptied to collect all the material inside, ensuring that no material remains in the screen or fails to discharge through the outlet during the sieving process. This effectively reduces material loss and waste, and helps improve material utilization and test accuracy. Attached Figure Description

[0018] Figure 1 A front view of an embodiment of the sieving device provided by the present invention without a sieving component;

[0019] Figure 2 A front view of one embodiment of the sieving device provided by the present invention, in which the sieving components have been placed;

[0020] Figure 3 This is a side view of the mounting bracket in the sieving device provided by the present invention;

[0021] Figure 4 A top view of the top plate of the mounting bracket in the sieving device provided by the present invention;

[0022] Figure 5 A side view of the active rotating plate in the sieving device provided by the present invention;

[0023] Figure 6 A top view of the active rotating plate in the sieving device provided by the present invention;

[0024] Figure 7 A side view of the clamping structure on the fixed cylinder in the sieving device provided by the present invention;

[0025] Figure 8 A top view of the support plate in the sieving device provided by the present invention;

[0026] Figure 9 A side view of the screening component in the sieving device provided by the present invention.

[0027] In the diagram: 1. Frame; 11. Frame base plate; 12. Fixed foot; 13. Connecting bolt; 2. Speed-regulating motor; 21. Output shaft; 22. Eccentric disc; 23. Drive shaft; 24. Combined connecting rod; 3. Top plate; 31. First connecting hole; 32. First eccentric bearing; 33. Third connecting hole; 34. Third rotating rod bearing; 35. Support column; 4. Active rotating plate; 41. Second connecting hole; 42. Second eccentric bearing; 43. Fourth connecting hole; 44. Fourth rotating rod bearing; 45. Stud; 46. Nut; 5. Support plate; 51. Fixed... 6. Fixed hole; 61. Fixed cylinder; 62. Square window; 63. Hanging ring; 64. Tensioning rope; 7. Locking hook; 85. Compression spring; 86. Screen plate; 87. Control system; 88. Main switch; 89. Speed ​​control switch; 80. Time control switch; 91. Display; 92. Cover; 93. 40-mesh sieve; 94. 80-mesh sieve; 95. Base box; 96. Mixed powdered experimental sample; 97. 40-mesh powdered experimental sample; 98. 80-mesh powdered experimental sample; 99. 100-mesh powdered experimental sample. Detailed Implementation

[0028] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0029] Experimental analysis of source rocks helps obtain accurate geological information. Different experimental analysis projects have different requirements for the particle size of rock samples. However, common existing technologies, such as those cited in the background section, often use sieve boxes with different densities at the bottom and discharge ports on the sides of the sieve boxes. However, materials far from the discharge ports have difficulty falling through, and some materials always fail to be discharged smoothly during the screening process. Furthermore, there is also the possibility of material clogging in the sieve mesh, resulting in significant material loss during screening. This greatly affects the accuracy and efficiency of experimental analysis. Based on this, the present invention provides a sieving device to solve the problems existing in the above-mentioned existing technologies.

[0030] The overall design concept of the sieving device provided by the present invention is as follows: simulating the stacked structure of a steamer, a stackable sieve is designed, and multiple sieves are pressed vertically by a pressing structure to ensure that the material in the sieve will not scatter during the sieving process. After the sieving is completed, a single sieve can be easily tilted, thereby achieving comprehensive and lossless collection of the material.

[0031] Specifically, as a basic technical solution, the screening device includes a frame, on which a vibration mechanism and a support platform are installed. The vibration platform moves the support platform, thereby screening materials. A fixture is installed on the support platform. Multiple screeners are stacked vertically in order of increasing bottom screen density to form an integrated screening assembly. The screening assembly is placed in the fixture, which limits the circumferential movement of the screening assembly. The fixture is also equipped with a clamping structure to fix the screening assembly vertically, thus ensuring that the screeners in the screening assembly do not scatter and affect material screening under the action of the vibration mechanism.

[0032] The combination of the fixing device and the clamping structure ensures that multiple stacked screens remain tightly fixed during the screening process, effectively preventing gaps between adjacent screens, thus preventing material spillage and cross-contamination, and guaranteeing the accuracy and reliability of the screening results. A vibration mechanism drives the support platform, causing the fixing devices on it to vibrate. During vibration, the material passes through the screen layer by layer and is gradually subdivided, improving screening efficiency. By replacing the screens with different screen densities at the bottom, it can adapt to screening tasks with different particle size requirements, demonstrating strong flexibility and adaptability.

[0033] After screening, the screening components are removed from the holder, and each screen can be individually emptied to collect all the material inside. This ensures that no material is left in the screen or fails to be discharged through the outlet during the screening process. At the same time, if the screen is blocked by material, the operator can clean it in a timely and effective manner and collect it promptly after cleaning. This effectively reduces material loss and waste and helps to improve material utilization and test accuracy.

[0034] Based on the above general description of the sieving device of the present invention, a more specific embodiment is provided below:

[0035] This embodiment focuses on a detailed description of the specific structure of the screening component and the assembly and removal of the screening component.

[0036] To facilitate quick removal of the screening components from the holder after screening for material collection, the holder features an operating port on its side. The holder can be a frame structure, with gaps in the frame providing the operating port for handling. The shape and size of the frame structure are adapted to the screening components, allowing multiple screening components to be stacked on the holder. The frame structure provides circumferential restraint for the screening components, and the operator can reach into the gaps in the frame structure to quickly remove the screening components through the top opening for subsequent material collection.

[0037] In this embodiment, as Figure 1 ,2 , Figures 7-9 As shown, the support platform is a support plate 5, on which a fixing cylinder 6 is fixedly mounted. The fixing cylinder 6 is a fixture with an installation cavity for the screening component. A square window 61 is provided on the fixing cylinder 6 as an operating port, with the central axis of the square window 61 corresponding to the central axis of the fixing cylinder 6. A compression spring 7 is fixed inside the fixing cylinder 6, and the other end of the compression spring 7 is fixed to a screen placement plate 71. The space above the screen placement plate is the installation space for the screening component. More preferably, the bottom of the square window 61 is positioned close to the bottom of the fixing cylinder 6. This allows the operator's hand to reach through the middle of the square window 61, near the upper middle of the horizontal direction of the screening component. The operator can then more easily grasp the bottom center of the screening component and lift it from the fixing cylinder 6. See also... Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, multiple fixed cylinders 6 are evenly arranged on the support platform. Through the action of the vibration mechanism on the support plate 5, multiple sets of materials can be screened simultaneously, significantly improving the screening efficiency. The square windows on each fixed cylinder face the same side, making it convenient for operators to lift the screening components from the fixed cylinder 6 one by one through the square windows 61 to collect the materials.

[0038] The screener includes a cylindrical body that fits into the fixed cylinder 6 with a clearance. The bottom of the cylindrical body has a screen, and the screeners are stacked vertically in sequence according to the density of their bottom screens. Of course, in other embodiments, the bottom of the screener can be detachably equipped with a screen, so as to facilitate replacement in case of screen wear, leakage, etc., and the bottom layer of the screening assembly can be set as a screenless screener. In this case, the material can fall to the bottom layer after being screened by the previous screener for easy collection.

[0039] To facilitate assembly, a flange can be provided around the top edge of the filter, and a corresponding groove matching the shape and size of the flange can be provided around the bottom edge. When two adjacent filters are stacked, the flange of one filter can be completely embedded into the groove of another filter, thus ensuring the stability of multiple filters stacked. Alternatively, in other embodiments, guide posts can be provided at intervals along the top edge of the filter, and guide holes can be provided at corresponding positions along the bottom edge of the filter. The depth of the guide holes is greater than or equal to the height of the guide posts. When the filters are stacked, the guide posts can be inserted into the guide holes to guide the filters, ensuring that the filters are stacked in a predetermined direction and increasing stability. In another embodiment, the top edge of the filter can be set as an inclined support surface, and the bottom edges of other filters can be set as support surfaces with complementary inclined directions. When two filters are stacked, the two inclined support surfaces abut against each other to limit the circumferential movement of the stacked filters. Alternatively, an internal thread can be provided on the inner side of the top of the filter and an external thread on the outer side of the bottom. Two adjacent filters can be connected to each other by threads and the screening components can be stacked one on top of the other. The threaded connection can provide higher stability and fastening force, and is more suitable for sieving processes that need to withstand greater vibration or impact.

[0040] To further reduce material loss during the screening process, such as Figure 9 As shown, the uppermost screen in the screening assembly is equipped with a pressure cap 91. Opening the pressure cap 91 allows all the material to be poured into the uppermost screen, and then closing the pressure cap 91 ensures a tight fit against the top of the screening assembly, creating a closed space within the uppermost screen. This effectively reduces the possibility of material spilling out from the gap between the screening assembly and the fixing device due to vibration, impact, or other external forces during the screening process, further reducing material loss. It also reduces interference from external factors in the screening process. Specifically, the pressure cap can be connected to a threaded interface on the top edge of the screen via threads. Alternatively, the bottom of the pressure cap can have a raised pressure block that fits the inner edge of the top of the screen; simply pressing the top of the pressure cap will install it onto the screen.

[0041] The clamping structure on the fixture ensures that during vibration, the multiple screens are tightly pressed together as a single screening assembly, preventing them from scattering or shifting due to vibration. Specifically, in this embodiment, as... Figure 1 , Figure 7 , Figure 8As shown, two hanging rings 62 are symmetrically arranged on the outer wall of the fixed cylinder 6. One hanging ring 62 is connected to a tension rope 63, and the other end of the tension rope 63 is connected to a locking hook 64. After the screening component is placed inside the fixed cylinder 6, the tension rope 63 is pulled to pass through the upper opening of the fixed cylinder 6, and the locking hook 64 is then hooked onto the other hanging ring 62. The hanging rings 62 on the fixed cylinder 6 and the tension rope 63 with the locking hook 64 constitute a clamping structure that can vertically limit the screening component. In this embodiment, a tension rope 63 with a certain degree of elasticity is selected, which can be tightly wrapped around the top of the fixed cylinder 6 to ensure that the screening components will not have gaps or fall apart due to vibration or centrifugal force during the screening process. Furthermore, two hanging rings 62 are symmetrically arranged on both sides of the fixed cylinder 6. The operator can pull the tension rope 63 from the top opening of the fixed cylinder 6 near the central axis to hook the locking hook 64 onto the other hanging ring 62. In another, more preferred embodiment, three hanging rings can be evenly arranged around the outer wall of the fixed cylinder, and the tension rope can better confine and press the screening components inside the fixed cylinder.

[0042] In other embodiments, the clamping structure can also be a clamping cap mounted on a fixed cylinder. The clamping cap and the fixed cylinder can be respectively provided with matching internal and external threads, so that after the screening component is placed inside the fixed cylinder, the clamping cap is screwed on to tighten its bottom against the screening component. Alternatively, the clamping cap can also be inserted into the fixed cylinder. When it is necessary to remove the screen, the operator can first open the clamping cap, then reach into the operating opening to support the bottom of the screening component for removal.

[0043] More specifically, such as Figure 2 and Figure 9 As shown, in this embodiment, the screening assembly includes, from top to bottom, a pressure cap 91, a 40-mesh screen 92, an 80-mesh screen 93, a 100-mesh screen 94, and a bottom screen without a screen, i.e., a bottom box 95. During the screening process, the mixed powdered experimental sample 96 is placed into the top 40-mesh screen 92, and then the pressure cap 91 is closed. Under the action of the vibration mechanism, the mixed powdered experimental sample 96 is gradually subdivided during vibration, and the sample falling into the 80-mesh screen 93 is the screened 40-mesh powdered experimental sample 97; the sample falling into the 100-mesh screen 92 is the 80-mesh powdered experimental sample 98; and the sample falling into the bottom bottom box 95 is the 100-mesh powdered experimental sample 99. After screening, the operator can remove the screening components and simply pour out each screen to obtain 100-mesh powdered experimental sample 99 for organic carbon, pyrolysis experiments, and chloroform bitumen A analysis; 40-mesh powdered experimental sample 97 for vitrinite reflectance determination; and 80-mesh powdered experimental sample 98 for kerogen micro-component and type classification and organic element analysis.

[0044] Based on the above general description of the sieving device of the present invention, a more specific embodiment is provided below:

[0045] This embodiment focuses on a detailed description of the vibration mechanism and its installation.

[0046] like Figures 1-6 As shown, bolt connection holes are provided on the frame base plate 11 on the lower side of the frame 1. The motor is fixed to the frame base plate 11 by connecting bolts 13. The bottom of the frame base plate 11 is provided with fixed rest feet 12 to ensure the stability of the frame 1 during screening operations. An eccentric disk 22 is connected to the output end of the motor. The other end of the eccentric disk 22 is rotatably mounted on the active rotating platform. A mounting bracket is fixed inside the frame 1. The mounting bracket includes a top plate 3 and four pillars 35 fixed on the lower side of the top plate. The four pillars 35 are welded to the frame base plate 11. The active rotating platform is an active rotating plate 4 set on the upper side of the mounting bracket. A support plate 5 is fixed on the active rotating plate 4. Thus, when the motor drives the active rotating plate 4 to perform a rotary motion, the support plate 5 can simultaneously perform a rotary motion, thereby performing material screening. Specifically, a stud 45 is fixed on the active rotating plate 4, and a fixing hole 51 is made on the support plate 5 at the position corresponding to the stud 45. The support plate 5 is installed on the upper side of the active rotating plate 4, and a nut 46 is installed after the stud 45 passes through the fixing hole 51 on the support plate 5. Of course, in other embodiments, the support panel can also be fixed to the active rotating plate by welding.

[0047] In this embodiment, as Figure 1 and Figure 2 As shown, the motor is a speed-regulating motor 2, and a control system 8 is installed inside the frame. The control system includes a main switch 81, a speed-regulating switch 82 that can adjust speed and time, and a time control switch 83. The upper end of the speed-regulating motor 8 has an output shaft. The output shaft passes through the first mounting structure on the top plate and is connected to an eccentric disk. The drive shaft at the other end of the eccentric disk is connected to the active rotating plate set on the upper side of the mounting bracket through the second mounting structure.

[0048] During screening, the speed control switch 82 and time control switch 83 are adjusted to set the rotational speed and time of the speed-regulating motor 2. After turning on the main switch 81, the speed-regulating motor 2 starts working. Furthermore, the various operating parameters of the speed-regulating motor 2 during screening can be displayed on the display 84 for the operator to view in a timely manner and make corresponding adjustments. In this embodiment, the speed-regulating motor 2 is more suitable for screening situations requiring frequent adjustments to the speed of the active rotating plate. Alternatively, in other embodiments, the motor can also be a servo motor with higher adjustment precision.

[0049] like Figures 1-6Specifically, the first mounting structure includes a first connecting hole 31 on the top plate 3, and a first eccentric bearing 32 is disposed within the first connecting hole 31. The second mounting structure includes a second connecting hole 41 on the active rotating plate 4, and a second eccentric bearing 42 is disposed within the second connecting hole 41. The output shaft 21 of the speed-regulating motor 2 passes through the first eccentric bearing 32 and is connected to the eccentric disk 22. The drive shaft 23 on the eccentric disk 22 is inserted into the second eccentric bearing 42. When the speed-regulating motor 2 starts, its output shaft 21 begins to rotate, causing the eccentric disk 22 connected to it to rotate. The drive shaft 23 on it will perform a circular motion around the rotation center of the eccentric disk 22. Since the drive shaft 23 is inserted into the second eccentric bearing 42, the active rotating plate 4 performs a rotary motion around its own center under the drive of the drive shaft 23. The eccentric disk 22 is connected to the top plate 3 and the active rotating plate 4 respectively through two eccentric bearings. The eccentric bearings can reduce the wear of the connecting parts during the screening process, thereby improving the service life of the screening device. Of course, in other embodiments, the drive shaft on the eccentric disk can be directly connected to the connection hole on the active rotating plate.

[0050] More preferably, a third mounting structure is provided on the periphery of the first mounting structure on the top plate 3, and a fourth mounting structure is provided on the periphery of the second mounting structure on the active rotating plate 4. The third mounting structure includes a third connecting hole 33 opened on the top plate 3 and a third rotating rod bearing 34 disposed in the third connecting hole 33. Correspondingly, the fourth mounting structure includes a fourth connecting hole 43 opened on the active rotating plate 4 and a fourth rotating rod bearing 44. The combined connecting rod 24 includes a horizontal rod and two vertical rods connected to the horizontal rod. The two vertical rods are respectively connected to the third and fourth rotating rod bearings on the active rotating plate 4 and the top plate 3.

[0051] The top plate 3 and the active rotating plate 4 achieve relative rotation through an eccentric bearing. The horizontal and vertical rods of the combined connecting rod 24, connected to the rotating rod bearings of the top plate 3 and the active rotating plate 4 respectively, can transmit rotational motion and share the load, ensuring coordinated movement of the top plate 3 and the active rotating plate 4. This disperses the force of the eccentric disk 22 over a larger area, reducing the concentration of force. Simultaneously, the addition of extra support points between the top plate 3 and the active rotating plate 4 improves the stability of the sieving device during rotational motion, ensuring long-term stable operation. Of course, in other embodiments, the aforementioned combined connecting rod can also be directly installed in the connecting holes between the top plate and the active connecting plate.

[0052] In this embodiment, as Figure 4 , Figure 6 As shown, both the top plate 3 and the active rotating plate 4 are square plates. The first connecting structure is located at the center of the top plate 3, and the second connecting structure is located at the center of the active rotating plate 4. Furthermore, to improve the overall fit between the first and second connecting structures and the third and fourth structures, as shown... Figures 3-6 As shown, a third connecting structure is provided at the four corners of the top plate 3, and a fourth connecting structure is provided at the four corners of the active rotating plate 4.

[0053] It should be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0054] Furthermore, various embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A sample screening device, comprising a frame, a support platform and a rotary motion mechanism mounted on the frame, the rotary motion mechanism being used to drive the support platform to perform rotary motion, characterized in that: A fixture is provided on the support platform. The fixture has an installation cavity for installing the screening components and a clamping structure for fixing the screening components vertically. The fixture is a fixing cylinder fixed to the support platform. The clamping structure includes hanging rings fixed on the side walls of opposite sides of the fixing cylinder. One hanging ring is connected to a tension rope with a certain elasticity. The other end of the tension rope is connected to a locking hook. The tension rope passes through the upper opening of the fixing cylinder and the locking hook is hooked onto the hanging ring on the other side. A vertical buffer structure is provided inside the fixing cylinder. The buffer structure includes a compression spring fixed to the support platform. The other end of the compression spring is fixed to a screen plate. The installation cavity is the space on the upper side of the screen plate. The screening components include at least two screens stacked vertically as one unit. A flange is provided on the top edge of the screen and a groove matching the shape and size of the flange is provided on the bottom edge. The flange of one screen can be completely embedded in the groove of another screen. The screen density of each screen increases sequentially from top to bottom.

2. The sieving device according to claim 1, characterized in that: The side of the fixture is provided with an operating port for the operator to move the screening component upward through the operating port.

3. The sieving device according to claim 2, characterized in that: The support platform is a support plate, the screener includes a cylindrical body that fits with the fixed cylinder with a gap, the bottom of the cylindrical body has a screen, and the uppermost screener in the screening assembly is also equipped with a pressure cap.

4. The sieving device according to claim 3, characterized in that: The fixed cylinder has a square window on its circumference to form the operating port, and the bottom of the square window is located near the bottom of the fixed cylinder.

5. The sieving device according to claim 4, characterized in that: Multiple fixed cylinders are evenly arranged on the support platform, and the square windows on each fixed cylinder face the same side.

6. The sieving device according to claim 1, characterized in that: The vibration mechanism includes a speed-regulating motor fixed on the frame, an eccentric disk connected to the output end of the speed-regulating motor, and the other end of the eccentric disk rotatably mounted on the active rotating platform, on which a support platform is fixed.

7. The sieving device according to claim 6, characterized in that: The frame is equipped with a mounting bracket. The active rotating platform is an active rotating plate set on the upper side of the mounting bracket. The top plate of the mounting bracket and the active rotating plate are respectively provided with a first and a second mounting structure. The output end of the speed regulating motor passes through the first mounting structure and is connected to an eccentric disk. The drive shaft at the other end of the eccentric disk is connected to the active rotating plate through the second mounting structure.

8. The sieving device according to claim 7, characterized in that: The top plate of the mounting bracket and the active rotating plate are respectively provided with a third and a fourth mounting structure on the periphery of the first and second mounting structures, and a combined connecting rod is assembled between the third and the fourth mounting structures.

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