Sample screening device

Abstract

The invention relates to the field of screening or sorting solid materials through a filter screen, in particular to a sample screening device. The sample screening device comprises a rack, a supporting platform and a vibration mechanism are arranged on the rack, the vibration mechanism acts on the supporting platform, a fixator is arranged on the supporting platform, the fixator is provided with a mounting cavity used for mounting a screening assembly, and a pressing structure used for fixing the screening assembly in the vertical direction is arranged on the fixator. The screening assembly comprises at least two screeners which are stacked into a whole in the vertical direction, and the screen density of the bottoms of the screeners is sequentially increased from top to bottom. Materials can pass through the screen cloth layer by layer in the vibration process to be gradually subdivided, and after screening is finished, the screening assembly can be taken out of the fixing device, so that each screening device is poured independently to collect all the materials in the screening device, it is ensured that no materials are left in the screen cloth or not discharged through the discharging port in the screening process, and the screening efficiency is improved. The material loss and waste are effectively reduced, and the material utilization rate and the test accuracy are favorably improved.

Description

Technical Field

[0001] The invention relates to the field of screening or sorting solid materials with a filter screen, and in particular to a sample screening device. Background Art

[0002] Organic geochemical analysis and testing aims to determine key parameters of source rocks, such as organic matter type, abundance, maturity, hydrocarbon generation potential, and sedimentary environment, and to make a comprehensive evaluation of source rocks in order to conduct oil and gas source comparison and oil and gas migration research. The process involves multiple experimental analysis projects including chloroform asphalt A analysis, vitrinite reflectance measurement, kerogen microscopic components and type classification, organic element analysis, organic carbon and pyrolysis experiments, etc. Each project puts forward specific requirements for the analysis and testing of rock samples, covering various links such as sampling, sample crushing, sample screening and testing. Among them, sample crushing and sample screening are the key steps in the preparation of rock samples. The purpose is to process the collected rock samples into powdered experimental samples that meet the requirements of each experimental analysis project. In addition, different experimental analysis projects have clear requirements for the quality and mesh number (particle size) of powdered experimental samples. For example, organic carbon, pyrolysis experiment and chloroform asphalt A analysis projects require samples to be crushed to more than 100 meshes, while vitrinite reflectance measurement requires the powdered experimental samples before kerogen separation to be 40 meshes, and kerogen microscopic components and type classification and organic element analysis require 80 meshes. At present, the preparation of rock samples usually uses a jaw crusher for coarse crushing, followed by a percussion crusher for fine crushing, and finally screens out powdered experimental samples that meet the test requirements.

[0003] In the prior art, a Chinese utility model patent with authorization announcement number CN216460011U discloses a grading and screening device for feed production, which specifically discloses a base, the base is connected to a grading and screening component through a vibration structure, the vibration structure includes a support plate symmetrically fixedly connected to the upper end surface of the base, a support member is provided between the two support plates, a cross bar is symmetrically fixed on both sides of the support member, and a number of springs A are provided between the left and right sides of the support member and between the support plates. A lifting block is provided inside the support member, and a number of vertical rods are symmetrically provided inside the support member. The lifting block is slidably installed on the vertical rod, and a number of springs B are provided between the upper and lower sides of the lifting block and the support member. A support platform is fixed on the upper end surface of the lifting block, and a grading and screening component is installed on the support platform. The grading and screening component includes a number of ethylene sorting screens vertically installed together, the screening accuracy of the sorting screen increases from top to bottom, and a discharge port is provided on the side of the sorting screen. A driving motor is provided inside the lifting block, and a rotating deflector is connected to the output end of the driving motor. When working, the driving motor drives the rotating deflector to rotate. When the rotating deflector rotates, it can exert force on the lifting block, so that the lifting block drives the supporting platform to perform circular motion on the cross bar, spring A, spring B and the support. The grading and screening components on the supporting platform also perform circular motion, and the materials in the grading and screening components are vibrated and screened up and down and left and right. At the same time, the materials that fall into different sorting screens after screening fall out from the discharge port on the side of the sorting screen for easy collection by the operator.

[0004] During the material screening process of the above-mentioned grading and screening equipment, it is more difficult for materials that are far away from the discharge port to move toward the discharge port. During the screening process, some materials will always fail to be discharged smoothly from the discharge port. Even during the screening process, the materials may be blocked in the mesh of the screen, further aggravating the loss of materials during the screening process and affecting the accuracy and work efficiency of the analysis and test. Summary of the invention

[0005] The purpose of the present invention is to provide a sample screening device to solve the problem that the grading screening equipment in the prior art cannot completely collect the materials after screening, resulting in serious material loss.

[0006] To achieve the above-mentioned purpose, the technical solution of the screening device provided by the present invention is: the screening device includes a frame, a supporting platform and a vibration mechanism are arranged on the frame, the vibration mechanism acts on the supporting platform, a fixer is arranged on the supporting platform, the fixer has an installation cavity for installing the screening component, and the fixer is provided with a clamping structure for fixing the screening component in the vertical direction, the screening component includes at least two filters stacked as a whole in the vertical direction, and the screen density at the bottom of each filter increases successively from top to bottom.

[0007] As a further improvement, an operating port is provided on the side of the holder, so that an operator can operate through the operating port to move the screening assembly upward.

[0008] As a further improvement, the supporting platform is a supporting plate, the fixing device is a fixed cylinder fixed on the supporting platform, the filter includes a cylindrical body which is gap-matched with the fixed cylinder, the bottom of the cylindrical body has a screen, and the topmost filter in the screening assembly is also provided with a pressure cover.

[0009] As a further improvement, a square window is opened on the circumference of the fixed tube to form the operation port, and the bottom of the square window is arranged close to the bottom of the fixed tube.

[0010] As a further improvement, the clamping structure includes hanging rings fixed on the side walls on opposite sides of the fixed cylinder, wherein a tensioning rope is connected to the hanging ring on one side, and a locking hook is connected to the other end of the tensioning rope. The tensioning rope passes around the upper side of the fixed cylinder and the locking hook is hung on the hanging ring on the other side.

[0011] As a further improvement, the vibration mechanism is a rotary motion mechanism, which is used to drive the supporting plate to perform a rotary motion. A vertical buffer structure is arranged in the fixed cylinder, and the buffer structure includes a compression spring fixed on the supporting plate. A screen plate is fixed to the other end of the compression spring. The installation cavity is the space on the upper side of the screen plate.

[0012] As a further improvement, a plurality of fixed tubes are evenly arranged on the support platform, and the square windows on each fixed tube face the same side.

[0013] As a further improvement, the vibration mechanism includes a speed regulating motor fixed on the frame, the output end of the speed regulating motor is connected to an eccentric disk, the other end of the eccentric disk is rotatably mounted on an active rotating platform, and a supporting platform is fixed on the active rotating platform.

[0014] As a further improvement, a mounting bracket is provided in the frame, and the active rotating platform is an active rotating plate arranged 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, and the driving shaft at the other end of the eccentric disk is connected to the active rotating plate through the second mounting structure.

[0015] As a further improvement, a third and a fourth mounting structure are respectively provided on the top plate of the mounting bracket and on the active rotating plate around the first and the second mounting structures, and a combined connecting rod is installed between the third and the fourth mounting structures.

[0016] The beneficial effect is that the present invention provides an improved sample screening device based on the prior art. The cooperation of the fixture and the clamping structure ensures that the multiple stacked screens remain tightly fixed during the screening process, effectively avoiding the generation of gaps between adjacent screens, thereby preventing the scattering and cross-contamination of materials, and ensuring the accuracy and reliability of the screening results. After the screening is completed, after the screening assembly is taken out of the fixture, each screen can be dumped separately to collect all the materials therein, ensuring that no material is left in the screen 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A front view of an embodiment of the sample screening device provided by the present invention without a screening component placed therein; Figure 2 A front view of an embodiment of the sample screening device provided by the present invention with a screening component placed therein; Figure 3 A side view of a mounting bracket in the sample screening device provided by the present invention; Figure 4 A top view of the top plate of the mounting bracket in the sample screening device provided by the present invention; Figure 5 A side view of the active rotating plate in the sample screening device provided by the present invention; Figure 6 A top view of the active rotating plate in the sample screening device provided by the present invention; Figure 7 A side view of a compression structure on a fixed cylinder in a sample screening device provided by the present invention; Figure 8 A top view of the supporting plate in the sample screening device provided by the present invention; Fig. 9 A side view of the screening assembly in the sample screening device provided by the present invention.

[0018] In the figure: 1, frame, 11, frame bottom plate; 12, fixed rest; 13, connecting bolt; 2, speed regulating motor, 21, output shaft, 22, eccentric plate, 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, pillar; 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, supporting plate; 51, fixed Fixed hole; 6. Fixed cylinder; 61. Square window; 62. Hanging ring; 63. Tension rope; 64. Lock hook; 7. Compression spring; 71. Screen plate; 8. Control system; 81. Main switch; 82. Speed ​​control switch; 83. Time control switch; 84. Display; 91. Pressure cover; 92. 40 mesh filter; 93. 80 mesh filter; 94. 100 mesh filter; 95. Bottom box; 96. Mixed powder experimental sample; 97. 40 mesh powder experimental sample; 98. 80 mesh powder experimental sample; 99. 100 mesh powder experimental sample. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The experimental analysis of source rocks helps to obtain accurate geological information. Different experimental analysis projects have different requirements for the particle size of rock samples. However, the common prior art cited in the background technology often sets a screen box with different densities at the bottom, and a discharge port is set on the side of the screen box. However, it is difficult for materials far away from the discharge port to fall out of the discharge port. During the screening process, there are always materials that fail to be discharged smoothly from the discharge port, and there will also be situations where materials are blocked in the mesh of the screen. The loss of material screening is large, which has a great impact on the accuracy and work efficiency of the experimental analysis. Based on this, the present invention provides a sample screening device to solve the problems existing in the above-mentioned prior art.

[0021] The overall design concept of the screening device provided by the present invention is: to simulate the stacking structure of steamers, to design a stackable filter, and to use a clamping structure to vertically compress multiple filters to ensure that the materials in the filters will not scatter during the screening process. After the screening is completed, a single filter can be easily dumped to achieve comprehensive and loss-free collection of materials.

[0022] Specifically, as a basic technical solution, the screening device includes a frame, a vibration mechanism and a support platform are provided on the frame, and the movement of the support platform is realized by the vibration platform, so as to screen the material. A fixture is provided on the support platform, and a plurality of screeners are stacked in the vertical direction in the order of increasing density of the bottom screen from top to bottom to form an integrated screening assembly, and the screening assembly is placed in the fixture, and the fixture limits the circumferential position of the screening assembly, and the fixture is provided with a clamping structure for fixing the screening assembly vertically, so as to ensure that under the action of the vibration mechanism, the individual screeners in the screening assembly will not fall off and affect the material screening.

[0023] The coordination of the holder and the clamping structure ensures that the multiple stacked screens remain tightly fixed during the screening process, effectively avoiding gaps between adjacent screens, thereby preventing the scattering and cross contamination of materials, and ensuring the accuracy and reliability of the screening results. The support platform is driven by the vibration mechanism to vibrate the holder set on it, and the material can pass through the screen layer by layer during the vibration process and be gradually subdivided, thereby improving the screening efficiency. The screen with different screen densities at the bottom can be replaced to adapt to screening tasks with different particle size requirements, which has strong flexibility and adaptability.

[0024] After the screening is completed, the screening assembly is taken out of the holder, and each screen can be dumped individually to collect all the materials inside, ensuring that no material is left in the screen or not discharged through the discharge port during the screening process. At the same time, when the material blocks the screen, the operator can clean it up promptly and effectively and collect it in time after cleaning, which effectively reduces material loss and waste and helps to improve material utilization and test accuracy.

[0025] Based on the overall introduction of the sample screening device of the present invention above, a more specific embodiment is provided below on the basis of the overall introduction: This embodiment focuses on a detailed description of the specific structure of the screening component and the assembly and removal of the screening component.

[0026] To facilitate the operator to quickly take out the screening component from the holder after the screening is completed and collect the screened materials. An operating port is provided on the side of the holder, and the holder can be a frame structure. The gap on the frame structure is the operating port for the operator to take out the materials. The shape and size of the frame structure are compatible with the screener, so that after multiple screeners are stacked and placed on the holder, the frame structure can limit the circumferential position of the screening component, and the operator can reach into the gap on the frame structure to quickly remove the screening component from the top opening of the frame structure for subsequent material collection.

[0027] In this embodiment, if Figure 1 , 2 , Figure 7-Figure 9 As shown, the supporting platform is a supporting plate 5, on which a fixed cylinder 6 is fixedly provided, and the fixed cylinder 6 is a fixture having a mounting cavity for mounting the screening component. A square window 61 is provided on the fixed cylinder 6 as an operating port, and the central axis of the square window 61 corresponds to the central axis of the fixed cylinder 6. A compression spring 7 is fixed in the fixed cylinder 6, and a screen plate 71 is fixed to the other end of the compression spring 7, and the space on the upper side of the screen plate is the installation space for the screening component. More preferably, the bottom of the square window 61 is arranged close to the bottom of the fixed cylinder 6, and at this time, the operator's hand is inserted from the middle of the square window 61, that is, close to the horizontal upper middle part of the screening component, and the operator can more conveniently grasp the bottom middle position of the screening component, and then hold the bottom of the screening component to take it out of the fixed cylinder 6. And see Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, a plurality of fixed cylinders 6 are evenly arranged on the support platform, and multiple groups of material screening can be completed at the same time through the action of the vibration mechanism on the support plate 5, which significantly improves the screening efficiency. The square windows on each fixed cylinder face the same side, which is convenient for the operator to lift the screening components from the fixed cylinder 6 upward through the square windows 61 one by one to collect the materials.

[0028] The screener includes a cylindrical body that is gap-matched with the fixed cylinder 6, and a screen is provided at the bottom of the cylindrical body. The screeners are stacked vertically in sequence according to the density of the screen at the bottom. Of course, in other embodiments, the screen can be detachably provided at the bottom of the screener, so that it is easy to replace the screen when it is worn, broken, etc., and the bottom layer of the screening component can be set as a screener without a screen. At this time, the material can fall into the bottom layer after being screened by the previous screener for easy collection.

[0029] For ease of assembly, a circle of flanges can be provided on the top edge of the filter, and a circle of corresponding grooves matching the shape and size of the flanges can be provided on the bottom edge. When two adjacent filters are stacked, the flange of one filter can be completely embedded in the groove of another filter, thereby ensuring the stability of the stacking of multiple filters. Alternatively, in other embodiments, guide posts can be provided at intervals at the top edge of the filter, and guide holes can be provided at corresponding positions at 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 play a guiding role, ensuring that the filters are stacked in a predetermined direction and increasing stability. In other embodiments, the top edge of the filter can also be provided as an inclined support surface, and the bottom edge of the other filter can be provided as a support surface with a complementary inclined direction. When two filters are stacked, the two inclined support surfaces are abutted against each other so that the stacked filters are mutually limited in the circumferential direction. Alternatively, an internal thread can be set on the inner side of the top of the filter and an external thread can be set on the outer side of the bottom. Two adjacent filters can be connected to each other through threads and the screening components can be stacked up and down. The threaded connection can provide higher stability and tightening force, and is more suitable for screening processes that need to withstand greater vibration or impact.

[0030] In order to further reduce the loss of materials during the screening process, such as Fig. 9 As shown, the filter on the top layer of the screening component is also equipped with a gland 91. Open the gland 91 to pour all the materials into the filter on the top layer, and then buckle the gland 91. The gland 91 can fit tightly on the top of the screening component, forming a closed space in the top layer of the filter, effectively reducing the possibility of materials spilling out of the gap between the screening component and the fixture due to vibration, impact or other external forces during the screening process, further reducing the loss of materials. And reduce the interference of external factors on the screening process. Specifically, the gland can be connected to the threaded interface set on the top edge of the filter through a thread. Alternatively, a raised pressure block that fits the inner edge of the top of the filter can also be set at the bottom of the gland, and the gland can be installed on the filter by directly pressing the top of the gland.

[0031] The clamping structure configured on the fixture ensures that during the vibration process, multiple filters are tightly compressed into an integrated screening assembly and will not be scattered or misplaced due to vibration. Figure 1 , Figure 7 , Figure 8As shown, two hanging rings 62 are symmetrically arranged on the outer wall of the fixed cylinder 6, one of the hanging rings 62 is connected with a tension rope 63, and the other end of the tension rope 63 is connected with a lock hook 64. After the screening component is placed in the fixed cylinder 6, the tension rope 63 is pulled to pass through the upper tube opening of the fixed cylinder 6, and the lock hook 64 is hung on the other hanging ring 62. The hanging ring 62 on the fixed cylinder 6 and the tension rope 63 with the lock hook 64 constitute a compression structure that can limit the vertical position of the screening component. In this embodiment, a tension rope 63 with a certain elasticity is selected, which can be tightly wound around the top of the fixed cylinder 6 to ensure that the screening component will not have gaps or scatter between the screens due to vibration or centrifugal force during the screening work. In addition, 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 tube opening of the fixed cylinder 6 close to the central axis to make the lock hook 64 hang on the other hanging ring 62. In another more preferred embodiment, three hanging rings may be evenly arranged on the circumference of the outer wall of the fixed cylinder, and the tension rope can better restrict and press the screening assembly in the fixed cylinder.

[0032] In other embodiments, the clamping structure may also be a top-tightening gland assembled on the fixed cylinder, and the top-tightening gland and the fixed cylinder may be provided with matching internal threads and external threads respectively, so that after the screening component is placed in the fixed cylinder, the top-tightening gland is screwed to make the bottom of the top-tightening gland press against the screening component. Alternatively, the top-tightening gland may also be inserted into the fixed cylinder. When the filter needs to be removed, the operator may first open the top-tightening gland, and then reach into the operating port to hold the bottom of the screening component for removal.

[0033] More specifically, Figure 2 and Fig. 9 As shown, the screening assembly in this embodiment includes a pressure cover 91, a 40-mesh screener 92, an 80-mesh screener 93, and a 100-mesh screener 94 from top to bottom, and the bottom layer is a screener without a screen installed at the bottom, that is, a bottom box 95. During the screening process, the mixed powdered experimental sample 96 is placed in the 40-mesh screener 92 on the top layer, and then the pressure cover 91 is covered. Under the action of the vibration mechanism, the mixed powdered experimental sample 96 is gradually subdivided during the vibration process, and falls into the 80-mesh screener 93 in turn, which is the screened 40-mesh powdered experimental sample 97, and falls into the 100-mesh screener 92, which is the 80-mesh powdered experimental sample 98; and falls into the bottom box 95 on the bottom layer, which is the 100-mesh powdered experimental sample 99. After the screening is completed, the operator takes out the screening assembly and only needs to dump each filter to obtain 100-mesh powdered experimental sample 99 for organic carbon, pyrolysis experiment and chloroform asphalt A analysis project, 40-mesh powdered experimental sample 97 for vitrinite reflectance measurement, and 80-mesh powdered experimental sample 98 for kerogen microscopic components and type classification and organic element analysis.

[0034] Based on the overall introduction of the sample screening device of the present invention above, a more specific embodiment is provided below on the basis of the overall introduction: This embodiment focuses on the detailed description of the vibration mechanism and the installation of the vibration mechanism.

[0035] like Figure 1-Figure 6 As shown, bolt connection holes are provided on the frame bottom plate 11 at the lower side of the frame 1, and the motor is fixed to the frame bottom plate 11 by connecting bolts 13. A fixed resting foot 12 is provided at the bottom of the frame bottom plate 11 to ensure the stability of the frame 1 during the screening operation. An eccentric disk 22 is connected to the output end of the motor, and the other end of the eccentric disk 22 is rotatably mounted on the active rotating platform. A mounting bracket is fixed in the frame 1, and the mounting bracket includes a top plate 3 and four pillars 35 fixed to the lower side of the top plate. The four pillars 35 are welded to the frame bottom plate 11. The active rotating platform is an active rotating plate 4 provided on the upper side of the mounting bracket, and a supporting plate 5 is fixed to the active rotating plate 4, so that when the motor drives the active rotating plate 4 to perform a gyratory motion, the gyratory motion of the supporting plate 5 can be simultaneously realized, thereby performing the screening of materials. Specifically, the studs 45 are fixed on the active rotating plate 4, and fixing holes 51 are also provided on the supporting plate 5 at positions corresponding to the positions connected to the studs 45. The supporting plate 5 is installed on the upper side of the active rotating plate 4, and the nuts 46 are installed after the studs 45 pass through the fixing holes 51 on the supporting plate 5. Of course, in other embodiments, the supporting panel can also be fixed to the active rotating plate by welding.

[0036] In this embodiment, Figure 1 and Figure 2 As shown, the motor is a speed-regulating motor 2, and a control system 8 is arranged in the frame. The control system includes a main switch 81, a speed-regulating switch 82 for adjusting speed and time, and a time control switch 83. The upper end of the speed-regulating motor 8 has an output shaft, and the output shaft is connected to an eccentric disk after passing through a first mounting structure on the top plate. The driving shaft at the other end of the eccentric disk is connected to an active rotating plate arranged on the upper side of the mounting bracket through a second mounting structure.

[0037] When screening, adjust the speed switch 82 and the time control switch 83 to set the rotation speed and time of the speed regulating motor 2, and turn on the main switch 81, and the speed regulating motor 2 starts to work. And the various working parameters of the speed regulating motor 2 in the screening can be timely known to the operator through the display 84, and the operator can make corresponding adjustments. In this embodiment, the speed regulating motor 2 is more suitable for screening situations where the speed of the active rotating plate needs to be frequently adjusted. Or in other embodiments, the motor can also be a servo motor with higher adjustment accuracy.

[0038] like Figure 1-Figure 6Specifically, the first mounting structure includes a first connecting hole 31 provided on the top plate 3, a first eccentric bearing 32 is provided in the first connecting hole 31, the second mounting structure includes a second connecting hole 41 provided on the active rotating plate 4, a second eccentric bearing 42 is provided in 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, and the driving shaft 23 on the eccentric disk 22 is inserted into the second eccentric bearing 42. When the speed regulating motor 2 is started, its output shaft 21 starts to rotate, so that the eccentric disk 22 connected thereto rotates, and the driving shaft 23 thereon will make a circular motion around the rotation center of the eccentric disk 22. Since the driving shaft 23 is inserted into the second eccentric bearing 42, the active rotating plate 4 makes a whirling motion around its own center driven by the driving shaft 23. The eccentric disk 22 is connected to the top plate 3 and the active rotating plate 4 respectively through two eccentric bearings, and the eccentric bearings can reduce the wear of the connection parts during the screening process, thereby improving the service life of the screening device. Of course, in other embodiments, the driving shaft on the eccentric disk can be directly connected to the connecting hole on the active rotating plate.

[0039] More preferably, a third mounting structure is provided on the top plate 3 around the first mounting structure, and a fourth mounting structure is provided on the active rotating plate 4 around the second mounting structure, the third mounting structure includes a third connecting hole 33 provided on the top plate 3 and a third rotating rod bearing 34 provided in the third connecting hole 33, and correspondingly, the fourth mounting structure includes a fourth connecting hole 43 provided on the active rotating plate 4 and a fourth rotating rod bearing 44. The combined connecting rod 24 includes a transverse rod and two vertical rods connected to the transverse rod, and the two vertical rods are connected to the third and fourth rotating rod bearings on the active rotating plate 4 and the top plate 3, respectively.

[0040] The top plate 3 and the active rotating plate 4 realize relative rotation through the eccentric bearing, and the transverse rod and the vertical rod of the combined connecting rod 24 are respectively connected to the rotating rod bearings of the top plate 3 and the active rotating plate 4, which can transmit the rotational motion and share the load, ensure the coordinated motion of the top plate 3 and the active rotating plate 4, and disperse the force of the eccentric disk 22 to a larger area, thereby reducing the concentration of force. At the same time, an additional support point is added between the top plate 3 and the active rotating plate 4, which can improve the stability of the sample screening device during the gyratory motion and ensure the long-term stable operation of the sample screening device. Of course, in other embodiments, the above-mentioned combined connecting rod can also be directly installed in the connecting hole between the top plate and the active connecting plate.

[0041] In this embodiment, if Figure 4 , Figure 6 As shown, the top plate 3 and the active rotating plate 4 are both square plates, the first connecting structure is arranged at the center of the top plate 3, and the second connecting structure is arranged at the center of the active rotating plate 4. In order to improve the overall coordination between the first and second connecting structures and the third and fourth structures, as shown in FIG. Figure 3-Figure 6 As shown, a third connection structure is provided at the four corners of the top plate 3 , and a fourth connection structure is provided at the four corners of the active rotating plate 4 .

[0042] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0043] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A sample screening device, comprising a frame, a support platform and a vibration mechanism are arranged on the frame, and the vibration mechanism acts on the support platform, wherein: A fixture is provided on the supporting platform, the fixture has an installation cavity for installing the screening component, and the fixture is provided with a clamping structure for fixing the screening component in the vertical direction. The screening component includes at least two screeners stacked as a whole in the vertical direction, and the screen density at the bottom of each screener increases successively from top to bottom.

2. The sample screening device according to claim 1, characterized in that: An operating port is provided on the side of the holder, so that an operator can operate through the operating port to move the screening component upward.

3. The sample screening device according to claim 2, characterized in that: The supporting platform is a supporting plate, the fixing device is a fixing cylinder fixed on the supporting platform, the filter comprises a cylindrical body which is gap-matched with the fixing cylinder, the bottom of the cylindrical body has a screen, and the topmost filter in the screening assembly is also provided with a pressure cover.

4. The sample screening device according to claim 3, characterized in that: A square window is provided on the circumference of the fixed tube to form the operation port, and the bottom of the square window is arranged close to the bottom of the fixed tube.

5. The sample screening device according to claim 3, characterized in that: The clamping structure includes hanging rings fixed on the side walls of the fixed cylinder on opposite sides, wherein a tensioning rope is connected to the hanging ring on one side, and a locking hook is connected to the other end of the tensioning rope. The tensioning rope passes around the upper tube opening of the fixed cylinder so that the locking hook is hung on the hanging ring on the other side.

6. The sample screening device according to claim 3, characterized in that: The vibration mechanism is a rotary motion mechanism, which is used to drive the supporting plate to perform rotary motion. A vertical buffer structure is arranged in the fixed cylinder, and the buffer structure includes a compression spring fixed on the supporting plate. A screen plate is fixed to the other end of the compression spring. The installation cavity is the space on the upper side of the screen plate.

7. The sample screening device according to any one of claims 4 to 6, characterized in that: A plurality of fixed cylinders are evenly arranged on the supporting platform, and the square windows on each fixed cylinder face the same side.

8. The sample screening device according to claim 1, characterized in that: The vibration mechanism comprises a speed regulating motor fixed on a frame, an output end of the speed regulating motor is connected with an eccentric disk, the other end of the eccentric disk is rotatably mounted on an active rotating platform, and a supporting platform is fixed on the active rotating platform.

9. The sample screening device according to claim 8, characterized in that: A mounting bracket is arranged in the frame, and the active rotating platform is an active rotating plate arranged 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 mounting structure and a second mounting structure. The output end of the speed regulating motor is connected with an eccentric disk after passing through the first mounting structure, and the driving shaft at the other end of the eccentric disk is connected to the active rotating plate through the second mounting structure.

10. The sample screening device according to claim 9, characterized in that: The third and fourth mounting structures are respectively provided on the top plate of the mounting bracket and the active rotating plate at the peripheral sides of the first and second mounting structures, and a combined connecting rod is installed between the third and fourth mounting structures.

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