Soil screening device for soil detection

Abstract

The utility model discloses a soil screener for soil detection, which comprises a support, a screening device is installed on the support, a fixing device is arranged on the support, the fixing device comprises an end frame, a cross rod, a clamping frame, an inserting groove, a fixing rod, a fixing sleeve, a reducing groove, a control sleeve, a fixing groove, a reducing plate and a fixing block, the cross rod is installed on one side of the end frame, the inserting groove is arranged on the support, and the clamping frame is arranged on the end frame. The variable-diameter plate is arranged in the control sleeve, the variable-diameter groove is formed in the control sleeve, the fixing groove is formed in the outer side of the fixing rod, the fixing block is connected to one side of the variable-diameter plate, and a locking mechanism is arranged on the outer side of the fixing sleeve and comprises a reset hole, a reset groove, a locking block, a limiting block, a reset plate, a supporting rod, a supporting plate, a locking sleeve and a locking spring; the multiple limiting blocks are installed on the outer side of the fixing sleeve, the two supporting plates are connected to one side of the locking sleeve through the supporting rods, the locking springs are connected with the two adjacent locking blocks, dynamic screening is achieved, and the structural stability is guaranteed while the screening barrel is conveniently maintained and replaced.

Description

Technical Field

[0001] This utility model relates to the field of soil screening technology for soil testing, and more specifically, it relates to a soil screening device for soil testing. Background Technology

[0002] In the fields of modern agriculture, environmental protection, and soil research, soil testing is a fundamental work process. Its accuracy and efficiency directly affect the scientific validity and effectiveness of subsequent research and production activities. However, current mainstream soil sieves still have many technical bottlenecks that need to be overcome in terms of functional implementation and structural design, and cannot fully meet the growing demand for high-efficiency sieves.

[0003] Firstly, traditional soil sieves mostly employ a static sieve technology, where soil samples are placed on a fixed sieve and separated by manual shaking or simple vibration devices. This results in insufficient interaction between soil particles during the sieve process, making it difficult for many fine particles to pass through the sieve pores in time. Furthermore, under static sieve conditions, soil particles tend to accumulate on the sieve surface, further hindering the sieve process. In practice, operators often need to manually turn the samples multiple times or extend the sieve time to barely achieve a basic separation effect. This inefficient sieve method not only significantly increases sample processing time and reduces the efficiency of laboratories or testing stations, but also increases the risk of sample contamination and data errors due to human intervention, severely limiting the ability to rapidly process large batches of soil samples.

[0004] Secondly, some improved soil sieves achieve dynamic sieving of soil samples by equipping core components such as rotatable sieve cylinders. However, the installation structure design of these improved devices is still crude. The traditional fixed structure makes the installation and disassembly of the sieve cylinder cumbersome and complicated, usually requiring multiple steps using various professional tools. In actual working environments, dust, clay, and organic matter in soil samples easily adhere to the surface of the screen and the inner wall of the sieve cylinder. After frequent use, a difficult-to-remove deposit layer will form, which not only affects the sieving accuracy but may also cause sieve hole blockage. However, maintenance personnel cannot quickly disassemble the sieve cylinder to thoroughly clean its interior and can only perform limited surface treatment, making it difficult to ensure that the equipment maintains a good working condition for a long time. More problematic is that when it is necessary to replace the sieve cylinder with one of different aperture sizes for soil samples with different particle size ranges, the cumbersome disassembly and assembly process significantly reduces work efficiency, especially in scenarios where multiple batches of different types of soil samples need to be processed continuously, which seriously affects the applicability and flexibility of the equipment.

[0005] Furthermore, to overcome the technical barriers of difficult disassembly and assembly of the screening cylinder, a few manufacturers have launched soil screening products with quick-disassembly mechanisms. However, while pursuing ease of operation, these quick-connection mechanisms result in serious deficiencies in connection strength and stability. During actual operation of the soil screening device, the equipment will generate obvious vibrations and shaking. The simplified quick-disassembly connection structure is prone to gradual loosening or sudden failure. When the connection structure becomes loose, it will not only cause gaps between the screening cylinder and the main unit, resulting in leakage of fine soil particles and sample contamination, but also generate abnormal noise and additional vibrations due to irregular collisions between parts, accelerating equipment wear. More seriously, if the connection structure completely falls off during high-speed operation, the rotating screening cylinder may break free from the equipment's restraint, causing not only sample loss and equipment damage, but also injury to operators, posing a serious safety hazard. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the problems existing in the prior art, this utility model provides a soil sieve for soil testing to solve the technical problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a soil sieve for soil testing, comprising a support, a sieving device mounted on the support, and a fixing device provided on the support. The fixing device includes end frames, a crossbar, a clamp, a slot, a fixing rod, a fixing sleeve, a variable diameter groove, a control sleeve, a variable diameter plate, and a fixing block. Two end frames are detachably mounted on the support. The crossbar is fixedly mounted on one side of the end frames. The bottom end of the clamp slides through the slot. One end of the fixing rod passes through the clamp and extends into the fixing sleeve. The slot is opened on the support. The variable diameter groove has a variable diameter structure and is opened in the control sleeve. The control sleeve is rotatably sleeved on the outside of the fixing sleeve. The fixing groove is opened on the outside of the fixing rod. The variable diameter plate slides... The control sleeve is movably installed in the variable diameter groove. The fixing block is inserted into the fixing groove and is fixedly connected to one side of the variable diameter plate. The variable diameter plate has a variable diameter structure design. A locking mechanism is provided on the outside of the fixing sleeve. The locking mechanism includes a reset hole, a reset groove, a locking block, a limit block, a reset plate, a support rod, a support plate, a locking sleeve, and a locking spring. The reset hole is opened at one end of the reset groove, and the reset groove is opened on the reset plate. Multiple locking blocks are movably installed on one side of the control sleeve. Multiple limit blocks are fixedly installed on the outside of the fixing sleeve. The reset plate is rotatably installed on the outside of the fixing sleeve. Two support plates are fixedly connected to one side of the locking sleeve by support rods. The locking sleeve is slidably sleeved on the outside of the fixing sleeve. The two ends of the locking spring are respectively connected to two adjacent locking blocks.

[0010] The present invention is further configured such that the screening device includes a motor, a feeding bin, a screening cylinder, a discharging bin, and a rotating frame. The motor is detachably mounted on the support, the screening cylinder is detachably mounted on the outside of the rotating frame, both ends of the screening cylinder are rotatably connected to end frames set on both sides, the output end of the motor is detachably connected to one end of the rotating frame, the discharging bin is detachably mounted on the inside of the support, and the feeding bin is fixedly mounted on one side of one end frame. The overall component layout forms a scientific and reasonable soil flow path, and the process from the feeding bin to the screening cylinder and then to the discharging bin constitutes a complete and efficient dynamic screening process system, which significantly improves the working efficiency and sample purity of soil screening.

[0011] The present invention is further configured such that a slider is fixedly provided on the outer side of the rotating frame, and a groove is provided on the inner side of the screening cylinder, and the slider slides in the groove, thereby ensuring synchronous operation and precise positioning between the rotating frame and the screening cylinder.

[0012] The present invention is further configured such that a plurality of locking rails are fixedly provided on one side of the control sleeve, and a locking groove is provided in the locking block. The locking groove is adapted to the locking rails. The precise adaptation design of the locking rails and the locking grooves constructs a precise and controllable locking block guiding system, ensuring that the locking block moves smoothly along a predetermined trajectory during the rotation of the control sleeve.

[0013] The present invention is further configured such that a support spring is connected to one side of the locking sleeve, and the other end of the support spring is connected to the reset plate in contact. The support spring is sleeved on the outside of the support rod, and the design of the support spring provides the locking sleeve with an automatic reset function.

[0014] The present invention is further configured such that a locking wheel is rotatably provided on one side of the locking block, and the locking wheel is engaged between the two limiting blocks.

[0015] The present invention is further configured such that side blocks are provided on both sides of the crossbar, and the side blocks are fixedly installed on both sides of the bracket.

[0016] The present invention is further configured such that a card block is detachably provided in the card holder, and the fixing rod passes through the bracket and the card block and is detachably inserted into the fixing sleeve.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a soil sieve for soil testing, which has the following beneficial effects:

[0019] 1. The screening device uses a motor-driven rotating frame, which in turn drives the screening cylinder through the cooperation of a slider and a chute to achieve dynamic rotational screening. This solves the technical problems of insufficient particle interaction force, difficulty for fine particles to pass through the screen, and the formation of accumulation layers on the surface in traditional static screening. The rotating design causes the soil sample to tumble in a multi-dimensional state within the screening cylinder, effectively preventing the accumulation of soil particles on the screen surface and significantly improving screening efficiency and separation accuracy. The rational layout of the feed and discharge bins forms a complete screening process, ensuring the continuity and purity of the soil sample throughout the entire process from input to separation to collection. The sliding connection structure of the slider and chute ensures precise transmission between the screening cylinder and the rotating frame, greatly improving the processing capacity of large batches of soil samples and meeting the urgent need for efficient screening in modern soil testing.

[0020] 2. The fixing device, through the ingenious cooperation of components such as end frames, crossbars, clamps, slots, fixing rods, fixing sleeves, variable diameter grooves, control sleeves, fixed grooves, variable diameter plates, and fixing blocks, constructs a scientific and efficient screening cylinder disassembly and assembly system. When it is necessary to clean or replace the screening cylinder internally, the operator only needs to rotate the control sleeve, which will drive the variable diameter plate to move through the variable diameter groove, causing the fixing block to detach from the fixing groove, thus separating the fixing sleeve from the fixing rod. This variable diameter plate, based on a variable diameter structure design, can ensure a smooth and gradual force transmission during disassembly and assembly. The cooperation structure between the side blocks and crossbars provides precise sliding guidance for the end frames, ensuring high-precision positioning during disassembly and assembly. The detachable connection design of the clamps and clamps further enhances the flexibility and convenience of the fixing structure, making the entire disassembly and assembly process free of the use of professional tools. This greatly simplifies the maintenance and cleaning process of the screening cylinder, solves the technical problems of cumbersome disassembly and assembly, difficult internal cleaning, and inconvenient replacement of traditional screening cylinders, and significantly improves the service life and working efficiency of the equipment.

[0021] 3. The locking mechanism, through the precise cooperation of components such as the reset hole, reset groove, locking block, limit block, reset plate, support rod, support plate, locking sleeve, and locking spring, forms a multi-layered anti-loosening system. The matching design of the locking rail and locking groove provides the locking block with a precise movement trajectory, ensuring smooth and controllable locking and unlocking processes. The interlocking structure between the locking wheel and the limit block forms a stable mechanical lock. The contact connection between the support spring and the reset plate ensures easy operation while providing a reliable automatic reset function. This multi-layered and multi-dimensional locking design completely solves the technical defects of existing quick-release sieves, such as insufficient connection strength and easy loosening and detachment. It ensures the stability and safety of the equipment during operation, avoids the risk of sample leakage, component collision, and equipment damage caused by structural loosening, and provides reliable protection for the long-term stable operation of the sieve and the personal safety of the operators. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall structure of a soil sieve for soil testing according to the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the dispersing structure of the screening cylinder in this utility model;

[0024] Figure 3 This is a structural schematic diagram of the fixing device and locking mechanism in this utility model;

[0025] Figure 4 This is a schematic diagram of the dispersed structure of the fixing device and locking mechanism in this utility model;

[0026] Figure 5 This is a schematic diagram showing the distributed cross-sectional structure of the fixing device and locking mechanism in this utility model.

[0027] In the diagram: 1. Bracket; 2. End frame; 3. Crossbar; 4. Card holder; 5. Slot; 6. Fixing rod; 7. Fixing sleeve; 8. Variable diameter groove; 9. Control sleeve; 10. Fixing groove; 11. Variable diameter plate; 12. Fixing block; 13. Reset hole; 14. Reset groove; 15. Locking block; 16. Limiting block; 17. Reset plate; 18. Support rod; 19. Support plate; 20. Locking sleeve; 21. Locking spring; 22. Motor; 23. Feeding bin; 24. Screening cylinder; 25. Discharge bin; 26. Rotating frame; 27. Slider; 28. Slide groove; 29. ​​Locking rail; 30. Locking groove; 31. Support spring; 32. Locking wheel; 33. Side block; 34. Card block. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] Please see Figures 1-5A soil sieve for soil testing includes a support 1, on which a sieving device is mounted. A fixing device is also provided on the support 1, comprising end frames 2, a crossbar 3, a clamp 4, a slot 5, a fixing rod 6, a fixing sleeve 7, a variable diameter groove 8, a control sleeve 9, a fixing groove 10, a variable diameter plate 11, and a fixing block 12. Two end frames 2 are detachably mounted on the support 1. The crossbar 3 is fixedly mounted on one side of the end frames 2. The bottom end of the clamp 4 slides through the slot 5. One end of the fixing rod 6 passes through the clamp 4 and extends into the fixing sleeve 7. The slot 5 is located on the support 1. The variable diameter groove 8, having a variable diameter structure, is located in the control sleeve 9, which is rotatably fitted onto the outside of the fixing sleeve 7. The fixing groove 10 is located on the outside of the fixing rod 6. The variable diameter plate 11 is slidably disposed in the variable diameter groove 8. The fixing block 12 is engaged with the fixing groove. In section 10, the fixing block 12 is fixedly connected to one side of the variable diameter plate 11. The variable diameter plate 11 has a variable diameter structure design. A locking mechanism is provided on the outside of the fixing sleeve 7. The locking mechanism includes a reset hole 13, a reset groove 14, a locking block 15, a limit block 16, a reset plate 17, a support rod 18, a support plate 19, a locking sleeve 20, and a locking spring 21. The reset hole 13 is opened at one end of the reset groove 14, and the reset groove 14 is opened on the reset plate 17. Multiple locking blocks 15 are movably arranged on one side of the control sleeve 9. Multiple limit blocks 16 are fixedly installed on the outside of the fixing sleeve 7. The reset plate 17 is rotatably installed on the outside of the fixing sleeve 7. Two support plates 19 are fixedly connected to one side of the locking sleeve 20 through the support rod 18. The locking sleeve 20 is slidably sleeved on the outside of the fixing sleeve 7. The two ends of the locking spring 21 are respectively connected to two adjacent locking blocks 15.

[0032] The screening device includes a motor 22, a feed bin 23, a screening cylinder 24, a discharge bin 25, and a rotating frame 26. The motor 22 is detachably mounted on the support 1. The screening cylinder 24 is detachably mounted on the outside of the rotating frame 26. Both ends of the screening cylinder 24 are rotatably connected to the end frames 2 set on both sides. The output end of the motor 22 is detachably connected to one end of the rotating frame 26. The discharge bin 25 is detachably mounted on the inside of the support 1. The feed bin 23 is fixedly mounted on one side of one of the end frames 2.

[0033] A slider 27 is fixedly provided on the outside of the rotating frame 26, and a groove 28 is provided on the inside of the screening cylinder 24, in which the slider 27 slides.

[0034] In this embodiment, when the device is to be used, the soil to be tested is first placed in the feed hopper 23, and then the soil enters the screening cylinder 24. Then the motor 22 is turned on, and the motor 22 drives the rotating frame 26 connected to the output end to rotate. The rotating frame 26 will drive the screening cylinder 24 to rotate through the slider 27 set on the outside and the sliding groove 28, so that the screening cylinder 24 performs dynamic screening. Then the soil that meets the particle size will fall into the feed hopper 25 set on the lower side through the filter holes. During the screening process, a protective cover can be set on the outside of the screening cylinder 24 to prevent the soil from falling outside the device. Then the screened soil will fall into the collection device set on the lower side through the feed hopper 25.

[0035] Please see Figures 1-5 As a further implementation of the overall equipment: multiple locking rails 29 are fixedly provided on one side of the control sleeve 9, and a locking groove 30 is provided in the locking block 15, which is adapted to the locking rails 29.

[0036] A spring 31 is connected to one side of the locking sleeve 20, and the other end of the spring 31 is connected to the reset plate 17 in contact. The spring 31 is sleeved on the outside of the support rod 18.

[0037] A locking wheel 32 is provided on one side of the locking block 15, which is rotated and engages between the two limiting blocks 16.

[0038] The crossbar 3 has side blocks 33 on both sides, and the side blocks 33 are fixedly installed on both sides of the bracket 1.

[0039] The card holder 4 is detachably equipped with a card block 34, and the fixing rod 6 passes through the bracket 1 and the card block 34 and can be detachably inserted into the fixing sleeve 7.

[0040] More specifically, when the screening cylinder 24 needs internal cleaning or replacement, first rotate the reset plate 17 clockwise, causing the reset plate 17 to drive the reset groove 14 and reset hole 13 to rotate clockwise. When the reset hole 13 rotates to the concentric position of the support plate 19, push the locking sleeve 20. The locking sleeve 20 will drive the support rod 18 and support plate 19 to slide into the reset hole 13, and the locking sleeve 20 will cooperate with the reset plate 17 to compress the support spring 31. When the support spring 31 is compressed to its limit, one of the support plates 19 near the locking sleeve 20 just passes through the reset hole 13 and moves to the other side of the reset plate 17. Then rotate the reset plate 17 counterclockwise, causing the reset plate 17 to drive the reset hole 13 and reset groove 14 to rotate counterclockwise, so that the support rod 18 is in the reset position. In groove 14, the support rod 18 and a support plate 19 near the control sleeve 9 cooperate to limit the locking sleeve 20 to one side of the reset plate 17, so that the locking sleeve 20 no longer limits the outer side of the locking wheel 32. Then, the control sleeve 9 is rotated in the forward direction. The control sleeve 9 drives the locking block 15 to rotate in the forward direction through the locking rail 29 and the locking groove 30. The locking block 15 will drive the locking wheel 32 to roll out between the two limiting blocks 16. The locking wheel 32 will drive the locking block 15 to slide outward along the locking rail 29 and the locking groove 30, so that the locking block 15 drives the locking spring 21 to stretch outward. At the same time, the control sleeve 9 will drive the inner diameter changing groove 8 to rotate in the forward direction. Then, the diameter changing groove 8 will rotate in the forward direction, so that the diameter changing plate 11 is in the diameter changing groove 8. The moving part of the screen 24 moves the fixed block 12 outwards, causing it to gradually detach from the fixed groove 10. Then, the fixed sleeve 7 and fixed rod 6 are pulled to both sides to remove them. Next, the locking block 34 is removed from the inside of the locking frame 4, and the locking frame 4 is pulled upwards to detach it from the slot 5. Then, the end frame 2 slides the crossbar 3 to one side, removing it from one side of the screening cylinder 24. The screening cylinder 24 is then moved to one side, causing the inner sliding groove 28 to slide along the slider 27, thus removing it from the outside of the rotating frame 26. The screening cylinder 24 can then be cleaned and replaced. After cleaning or replacement, the screening cylinder 24 is reassembled. The new component is installed on the outside of the rotating frame 26, aligning the slide groove 28 with the slider 27, so that the slider 27 is in the slide groove 28. Then, one end of the screening cylinder 24 is rotatably connected to the other end frame 2 installed on the support 1. The removed end frame 2 is then slid back into the corresponding position between the two side blocks 33, and the other end of the rotating frame 26 is rotatably connected to this end frame 2. Then, the clamp 4 is fitted onto the outside of the crossbar 3, and the bottom end of the clamp 4 is reinserted into the slot 5 to limit the crossbar 3. Then, the clamp block 34 is installed on the inside of the clamp 4. Then, the fixing rod 6 passes through the clamp 4 and the clamp block 34 from one side of the clamp 4. Then, the fixing sleeve 7 is fitted onto the outside of the fixing rod 6 from the other side. Then, the control sleeve 9 is rotated in the opposite direction.The control sleeve 9, via the locking rail 29 and locking groove 30, causes the locking block 15 and locking wheel 32 to rotate in opposite directions. This, in turn, causes the control sleeve 9 to cause the inner diameter-changing groove 8 to rotate in opposite directions. Then, the diameter-changing plate 11 causes the fixing block 12 to slide in opposite directions, allowing the fixing block 12 to re-engage in the fixing groove 10. When the fixing block 12 is fully engaged in the fixing groove 10, the control sleeve 9 stops rotating. The locking rail 29 and locking groove 30 then work together to move the locking block 15 between the two original limiting blocks 16. The locking spring 21 then resets, pulling the locking block 15 to slide inwards along the locking rail 29 and locking groove 30, causing the locking block 15 to cause the locking wheel 32 to re-engage between the two original limiting blocks 16. Finally, the reset plate 17 rotates forward again, causing the reset hole 13 and reset groove 14 to rotate forward. Then, when the reset hole 13 rotates again to a position concentric with the support plate 19, the support spring 31 resets and pushes the locking sleeve 20 to slide back to its original position. The locking sleeve 20 then drives the support rod 18 and the two support plates 19 to slide back to their original positions. After the support spring 31 is fully reset, the support plate 19 at the end of the support rod 18 moves back to its original side of the reset plate 17. The reset plate 17 is then rotated, causing the reset groove 14 and reset hole 13 to rotate back to positions not corresponding to the support plate 19 and support rod 18. The support rod 18, in conjunction with the end support plate 19, limits and supports the locking sleeve 20 to one side of the reset plate 17. The inner wall of the locking sleeve 20 then limits the outer wall of the locking wheel 32, preventing the locking block 15 and the locking wheel 32 from moving outwards. This limits the rotation of the control sleeve 9, preventing accidental unlocking and ensuring installation stability, thereby guaranteeing the stable operation of the screening process.

[0041] In summary, when using or operating the equipment: First, place the soil to be tested into the feed hopper 23, then allow the soil to enter the screening cylinder 24. Then, turn on the motor 22, which drives the rotating frame 26 connected to the output end to rotate. The rotating frame 26, through the slider 27 on the outside and the chute 28, drives the screening cylinder 24 to rotate, allowing the screening cylinder 24 to perform dynamic screening. Soil that meets the particle size requirements will fall through the filter holes into the discharge hopper 25 on the lower side. During the screening process, a protective cover can be placed on the outside of the screening cylinder 24 to prevent soil from falling outside the equipment. The screened soil will then fall through the discharge hopper 25 into the collection device on the lower side.

[0042] When the screening cylinder 24 needs internal cleaning or replacement, first rotate the reset plate 17 clockwise, causing the reset plate 17 to drive the reset groove 14 and reset hole 13 to rotate clockwise. When the reset hole 13 rotates to the concentric position of the support plate 19, push the locking sleeve 20. The locking sleeve 20 will drive the support rod 18 and support plate 19 to slide into the reset hole 13, and the locking sleeve 20 will cooperate with the reset plate 17 to compress the support spring 31. When the support spring 31 is compressed to its limit, the support plate 19 near the locking sleeve 20 just passes through the reset hole 13 and moves to the other side of the reset plate 17. Then rotate the reset plate 17 counterclockwise, causing the reset plate 17 to drive the reset hole 13 and reset groove 14 to rotate counterclockwise, so that the support rod 18 is in the reset groove 14, and then the support rod 18 and the support plate 19 are in the reset groove 14. The control sleeve 9 is supported by a support plate 19, which limits the locking sleeve 20 to one side of the reset plate 17, so that the locking sleeve 20 no longer limits the outer side of the locking wheel 32. Then, the control sleeve 9 is rotated in the forward direction. The control sleeve 9 drives the locking block 15 to rotate in the forward direction through the locking rail 29 and the locking groove 30. The locking block 15 will drive the locking wheel 32 to roll out between the two limiting blocks 16. The locking wheel 32 will drive the locking block 15 to slide outward along the locking rail 29 and the locking groove 30, so that the locking block 15 drives the locking spring 21 to stretch outward. At the same time, the control sleeve 9 will drive the inner diameter-changing groove 8 to rotate in the forward direction. Then, the diameter-changing groove 8 will rotate in the forward direction, so that the diameter-changing plate 11 moves in the diameter-changing groove 8 and drives the fixed block 12 to gradually move outward, so that the fixed plate 11 moves outward. The fixed block 12 gradually detaches from the fixed groove 10. Then, the fixed sleeve 7 and the fixed rod 6 are pulled to both sides to remove them. Next, the locking block 34 is removed from the inside of the locking frame 4, and the locking frame 4 is pulled upward to disengage it from the slot 5. Then, the end frame 2 drives the crossbar 3 to slide to one side, removing the end frame 2 from one side of the screening cylinder 24. Then, the screening cylinder 24 is moved to one side, causing the inner sliding groove 28 to slide along the slider 27, thus removing the screening cylinder 24 from the outside of the rotating frame 26. The screening cylinder 24 can then be cleaned and replaced. After cleaning or replacement, the screening cylinder 24 is reinstalled on the outside of the rotating frame 26, aligning the sliding groove 28 with the slider 27. Block 27 is positioned in the chute 28. Then, one end of the screening cylinder 24 is rotatably connected to the other end frame 2 mounted on the support 1. The removed end frame 2 is then slid back into the corresponding position between the two side blocks 33, and the other end of the rotating frame 26 is rotatably connected to this end frame 2. The clamp 4 is then fitted onto the outside of the crossbar 3, and the bottom end of the clamp 4 is reinserted into the slot 5 to limit the crossbar 3. The clamp block 34 is then installed inside the clamp 4. The fixing rod 6 passes through the clamp 4 and clamp block 34 from one side of the clamp 4. The fixing sleeve 7 is then fitted onto the outside of the fixing rod 6 from the other side. The control sleeve 9 is then rotated in the opposite direction, causing the locking block 15 and locking wheel 32 to rotate in the opposite direction via the locking rail 29 and locking groove 30.This causes the control sleeve 9 to rotate in the reverse direction, causing the inner diameter-changing groove 8 to rotate. Then, the diameter-changing plate 11 causes the fixing block 12 to slide in the reverse direction, allowing the fixing block 12 to re-engage in the fixing groove 10. When the fixing block 12 is fully engaged in the fixing groove 10, the control sleeve 9 stops rotating. This causes the locking rail 29 and locking groove 30 to work together to move the locking block 15 between the two original limiting blocks 16. Then, the locking spring 21 resets, pulling the locking block 15 to slide inward along the locking rail 29 and locking groove 30, causing the locking block 15 to drive the locking wheel 32 to re-engage between the two original limiting blocks 16. Then, the reset plate 17 rotates forward again, causing the reset plate 17 to rotate forward, driving the reset hole 13 and reset groove 14. Then, when the reset hole 13 rotates again to be concentric with the support plate 19... When the spring 31 resets, it pushes the locking sleeve 20 to slide back to its original position. Then, the locking sleeve 20 drives the support rod 18 and the two support plates 19 to slide back to their original positions. After the spring 31 is fully reset, the support plate 19 at the end of the support rod 18 moves back to the original side of the reset plate 17. Then, the reset plate 17 is rotated, causing the reset groove 14 and reset hole 13 to rotate back to a position that does not correspond to the support plate 19 and the support rod 18. Then, the support rod 18, in conjunction with the end support plate 19, limits and supports the locking sleeve 20 to one side of the reset plate 17. Then, the inner wall of the locking sleeve 20 limits the outer wall of the locking wheel 32, preventing the locking block 15 and the locking wheel 32 from moving outward. This achieves rotational limitation of the control sleeve 9, prevents accidental unlocking, ensures installation stability, and thus ensures the stable operation of the screening process.

[0043] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A soil sieve for soil testing, comprising a support (1), characterized in that: A screening device is installed on the support (1), and a fixing device is provided on the support (1). The fixing device includes an end frame (2), a crossbar (3), a clamp (4), a slot (5), a fixing rod (6), a fixing sleeve (7), a variable diameter groove (8), a control sleeve (9), a fixing groove (10), a variable diameter plate (11), and a fixing block (12). Two end frames (2) are installed on the support (1), the crossbar (3) is installed on one side of the end frame (2), the bottom end of the clamp (4) passes through the slot (5), the slot (5) is opened on the support (1), the variable diameter groove (8) is opened in the control sleeve (9) in a variable diameter structure, and the fixing groove (10) is opened on the outside of the fixing rod (6). Block (12) is connected to one side of the variable diameter plate (11). A locking mechanism is provided on the outside of the fixed sleeve (7). The locking mechanism includes a reset hole (13), a reset groove (14), a locking block (15), a limit block (16), a reset plate (17), a support rod (18), a support plate (19), a locking sleeve (20), and a locking spring (21). The reset hole (13) is opened at one end of the reset groove (14). The reset groove (14) is opened on the reset plate (17). Multiple limit blocks (16) are installed on the outside of the fixed sleeve (7). Two support plates (19) are connected to one side of the locking sleeve (20) through the support rod (18). The locking spring (21) is connected to two adjacent locking blocks (15).

2. A soil sieve for soil testing according to claim 1, characterized in that: The screening device includes a motor (22), a feed bin (23), a screening cylinder (24), a discharge bin (25), and a rotating frame (26). The motor (22) is detachably mounted on the support (1). The screening cylinder (24) is detachably mounted on the outside of the rotating frame (26). The two ends of the screening cylinder (24) are rotatably connected to the end frames (2) set on both sides. The output end of the motor (22) is detachably connected to one end of the rotating frame (26). The discharge bin (25) is detachably mounted on the inside of the support (1). The feed bin (23) is fixedly mounted on one side of one of the end frames (2).

3. A soil sieve for soil testing according to claim 2, characterized in that: A slider (27) is fixedly provided on the outside of the rotating frame (26), and a groove (28) is provided on the inside of the screening cylinder (24), and the slider (27) slides in the groove (28).

4. A soil sieve for soil testing according to any one of claims 1-3, characterized in that: The control sleeve (9) is fixedly provided with multiple locking rails (29) on one side, and the locking block (15) is provided with a locking groove (30), which is adapted to the locking rails (29).

5. A soil sieve for soil testing according to claim 4, characterized in that: A spring (31) is connected to one side of the locking sleeve (20), and the other end of the spring (31) is connected to the reset plate (17) in contact. The spring (31) is sleeved on the outside of the support rod (18).

6. A soil sieve for soil testing according to claim 5, characterized in that: The locking block (15) has a locking wheel (32) on one side that rotates, and the locking wheel (32) is engaged between two limiting blocks (16).

7. A soil sieve for soil testing according to claim 1, characterized in that: The crossbar (3) has side blocks (33) on both sides, and the side blocks (33) are fixedly installed on both sides of the bracket (1).

8. A soil sieve for soil testing according to claim 7, characterized in that: The card holder (4) is detachably provided with a card block (34), and the fixing rod (6) passes through the bracket (1) and the card block (34) and is detachably inserted into the fixing sleeve (7).

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