Soil screening device

Abstract

The utility model discloses a soil screener which comprises a vibration mechanism, a weighing sensor and a screening mechanism, the vibration mechanism comprises a vibration driving part and a movable plate, and the vibration driving part is connected with the movable plate and used for driving the movable plate to vibrate; the fixed end of the weighing sensor is fixed on the movable plate; the screening mechanism comprises a mounting plate, a plurality of screening boxes and a cover body. The soil particle screening device has the advantages that the weight difference of the screen boxes before and after the screen boxes are disassembled is measured through the weighing sensors, so that the weight of each screen box is obtained, the weight of soil particles in each screen box can be obtained by subtracting the self weight of each screen box, the soil particles in the screen boxes do not need to be poured onto a weighing table to be weighed, and the experiment efficiency can be improved; meanwhile, according to the device, the cover body is directly and detachably fixed to the uppermost screen box, so that structures such as a pressing plate and a locking screw do not need to be arranged, the equipment cost can be reduced, the operation steps are simplified, and the use convenience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soil screening, and particularly relates to a soil screener. Background Art

[0002] A soil screener, also known as a soil sieve, is a device used for screening and grading soil and other granular materials. When in use, a soil screener needs to assemble multiple sieve boxes with different mesh number sieves together to achieve the grading and screening effect.

[0003] The sieve boxes of traditional soil screeners are directly stacked together. A cover plate is placed on the top sieve box, and then the pressure plate is locked on the screw rod, and the cover plate is pressed by the pressure plate to realize the pressing of each layer of sieve boxes. Since the adjacent sieve boxes are not fixed, the stability of the sieve boxes is poor. In this regard, the Chinese utility model patent with the application number CN202121343486.0 discloses a volatile organic compound contaminated soil screener, which improves the stability of the sieve boxes through the detachable fixed connection of adjacent sieve boxes. However, both this soil screener and traditional soil screeners still have the following two defects:

[0004] (1) The soil screener does not have a weighing function. Therefore, after screening, it is necessary to pour the samples in each sieve box onto the weighing platform for weighing in sequence, resulting in a reduction in experimental efficiency;

[0005] (2) The lid of the box is pressed by a pressure plate, and the pressure plate needs to be locked on the screw rod through a nut. This not only has a high production cost, but also when disassembling the sieve box, it is necessary to first disassemble two nuts, then disassemble the pressure plate, and then remove the lid. During installation, the reverse operation is required, and the use process is relatively cumbersome. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the above technical deficiencies, and propose a soil screener to solve the technical problems that the existing soil screener does not have a weighing function and the operation is relatively inconvenient.

[0007] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a soil screener, including:

[0009] A vibration mechanism, the vibration mechanism includes a vibration driving member and a movable plate, the vibration driving member is connected to the movable plate and is used to drive the movable plate to vibrate;

[0010] A weighing sensor, the fixed end of the weighing sensor is fixed to the movable plate; and,

[0011] The screening mechanism includes a mounting plate, a plurality of screen boxes and a cover body, the mounting plate is fixed to the detection end of the weighing sensor, a screen is fixed in each screen box, and each screen box is arranged in sequence above the mounting plate from bottom to top, and two adjacent screen boxes are detachably fixedly connected, the lowest screen box is detachably fixed to the mounting plate, and the cover body is detachably fixed to the highest screen box.

[0012] In some embodiments, the vibration driving component includes a bottom box, a fixed plate and an exciter. A through hole is opened on the upper end surface of the bottom box. The fixed plate is fixed in the bottom box. The movable plate is fixed above the fixed plate via a plurality of first elastic members. The exciter is connected to the movable plate and is used to drive the movable plate to vibrate.

[0013] In some embodiments, the detection end of the weighing sensor is fixedly connected to the mounting plate via a plurality of connecting columns.

[0014] In some embodiments, two first plug blocks are fixed on the mounting plate, and a first locking hole is formed on the first plug block. A first lock body is fixed to the outer wall of each of the screen boxes, and the first lock body includes a first locking block, a first sliding block, a first locking rod, a first lever and a second elastic member. The first locking block is fixed to the outer wall of the screen box, and a first through-hole for allowing the first plug block to pass through is formed on the first locking block. A first sliding groove connected to the first through-hole is formed in the first locking block, and a first yielding groove connected to the first sliding groove is also formed on the first locking block. The first locking rod is fixed to the first sliding block and is used to be inserted in the first locking hole. The first lever is fixed to the first sliding block and extends to the outside of the first sliding groove via the first yielding groove. One end of the second elastic member is connected to the inner wall of the first sliding groove, and the other end of the second elastic member is connected to the first sliding block.

[0015] In some embodiments, an upper surface of the first plug block is an inclined surface, and the inclined surface faces the first locking rod.

[0016] In some embodiments, two second plug blocks are fixed to the outer wall of each of the screen boxes, and a second lock hole is formed on the second plug block. The upper surface of the second plug block is an inclined surface, and the inclined surface faces the first locking rod. When the upper screen box is buckled into the lower screen box, the second plug block on the lower screen box is inserted into the first through hole of the first lock body on the upper screen box, and the first locking rod corresponding to the upper screen box is inserted into the second lock hole of the second plug block of the lower screen box.

[0017] In some embodiments, a second lock body is fixed to the outer side wall of the cover body. The second lock body includes a second lock block, a second slider, a second lock rod, a second lever, and a third elastic member. The second lock block is fixed to the outer side wall of the cover body. A second through hole for the corresponding second insertion block of the uppermost sieve box to pass through is formed in the second lock block. A second sliding groove communicating with the second through hole is formed in the second lock block. A second relief groove communicating with the second sliding groove is further formed in the second lock block. The second lock rod is fixed to the second slider and is used for being inserted into a corresponding second lock hole of the uppermost sieve box. The second lever is fixed to the second slider and extends out of the second sliding groove through the second relief groove. One end of the third elastic member is connected to the inner wall of the second sliding groove, and the other end of the third elastic member is connected to the second slider.

[0018] In some embodiments, a positioning ring is fixed to the mounting plate; a first embedded ring is formed on the lower end surface of each sieve box. The first embedded ring of the lowermost sieve box is used for being embedded in the positioning ring, and the first embedded ring of each sieve box is used for being embedded in the upper end opening of the next lower sieve box.

[0019] In some embodiments, a second embedded ring is formed on the lower end surface of the cover body, and the second embedded ring is used for being embedded in the upper end opening of the uppermost sieve box.

[0020] In some embodiments, the soil sieve further includes a tensioning mechanism. The tensioning mechanism includes a first hanging ring, a connecting block, a pulling rope, and a first hook. The first hanging ring is fixed to the outer edge of the mounting plate. The connecting block is fixed to the cover body. One end of the pulling rope is detachably fixed to the connecting block, and the other end of the pulling rope is fixedly connected to the first hook. The first hook is used for hanging on the corresponding first hanging ring.

[0021] Compared with the prior art, the beneficial effects of the soil sieve provided by the present utility model are as follows: By measuring the weight difference of each sieve box before and after disassembly through a weighing sensor, the weight of each sieve box can be obtained. After subtracting the self-weight of the sieve box, the weight of the soil particles in each sieve box can be obtained. It is not necessary to pour the soil particles in the sieve box onto a weighing platform for weighing, which can improve the experimental efficiency; at the same time, the cover body of the present device is directly detachably fixed to the uppermost sieve box, so that structures such as a pressing plate and a locking screw do not need to be provided, which can reduce the equipment cost, simplify the operation steps, and improve the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a perspective structural schematic diagram of a soil sieve provided by an embodiment of the present utility model;

[0023] Figure 2 is Figure 1Top view of the soil sieve in

[0024] Figure 3 is Figure 2 Cross-sectional view of section A-A in

[0025] Figure 4 is Figure 3 Partial enlarged view of area B in

[0026] Figure 5 is Figure 3 Partial enlarged view of area C in

[0027] Figure 6 is Figure 3 Partial enlarged view of area D in

[0028] Figure 7 is Figure 1 Schematic diagram of the three-dimensional structure of a sieve box in

[0029] Explanation of reference numerals: 1 - vibration mechanism, 11 - vibration drive, 111 - bottom box, 1111 - through hole, 112 - fixing plate, 113 - vibrator, 12 - movable plate, 2 - weighing sensor, 21 - connecting column, 3 - screening mechanism, 31 - mounting plate, 311 - first plug, 3111 - first locking hole, 312 - positioning ring, 32 - sieve box, 321 - first locking body, 3211 - first locking block, 32111 - first through hole, 32112 - first chute, 32113 - first relief groove, 3212 - first slider, 3213 - first locking rod, 3214 - first lever, 3215 - second elastic member, 322 - second plug, 3221 - second locking hole, 323 - first inner ring, 33 - cover, 331 - second locking body, 3311 - second locking block, 33112 - second chute, 33113 - second relief groove, 3312 - second slider, 3313 - second locking rod, 3314 - second lever, 3315 - third elastic member, 332 - second inner ring, 34 - sieve mesh, 4 - tensioning mechanism, 41 - first hanging ring, 42 - connecting block, 43 - pulling rope, 44 - first hook, 45 - second hook, 46 - second hanging ring. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] In order to solve the technical problems that the existing soil sieves do not have a weighing function and are relatively inconvenient to operate, the present utility model provides a soil sieve that can achieve a weighing function and is more convenient to operate.

[0032] It should be noted that the soil sieve described in the present utility model is used for, but not limited to, the screening of soil samples, and can also be used for the screening of other granular materials. The present utility model does not make any limitation in this regard.

[0033] Please refer to Figure 1 , Figure 1 , which is a schematic three-dimensional structure diagram of the soil sieve in an embodiment of the present utility model. The soil sieve includes a vibration mechanism 1, a weighing sensor 2, and a screening mechanism 3.

[0034] Please refer to Figures 1 - 3 , the vibration mechanism 1 includes a vibration driving member 11 and a movable plate 12. The vibration driving member 11 is connected to the movable plate 12 and is used to drive the movable plate 12 to vibrate.

[0035] The fixed end of the weighing sensor 2 is fixed to the movable plate 12.

[0036] The screening mechanism 3 includes a mounting plate 31, a plurality of sieve boxes 32, and a cover 33. The mounting plate 31 is fixed to the detection end of the weighing sensor 2. A sieve mesh 34 is fixed in each of the sieve boxes 32. The sieve boxes 32 are arranged above the mounting plate 31 in sequence from bottom to top. Two adjacent sieve boxes 32 are detachably and fixedly connected. The lowermost sieve box 32 is detachably and fixedly connected to the mounting plate 31. The cover 33 is detachably and fixedly connected to the uppermost sieve box 32. It should be understood that in specific implementation, the number of sieve boxes 32 can be selected according to needs to meet the experimental requirements. Usually, the number of sieve boxes 32 is 3 - 5. In this embodiment, the number of sieve boxes 32 is five, and a solid bottom plate is padded in the lowermost sieve box 32 to prevent the material from falling onto the mounting plate 31. The mesh number of the sieve mesh in each sieve box (hereinafter referred to as the mesh number of the sieve box) increases from top to bottom, so that the size of the screened material becomes smaller and smaller.

[0037] During use, first accurately measure the weight of each sieve box 32 when it is not loaded with materials. Then fix the sieve box 32 with the largest mesh number to the mounting plate 31, and fix the sieve box 32 with the second largest mesh number above the sieve box 32 with the largest mesh number, and so on. Continuously fix the sieve boxes 32 with smaller mesh numbers in sequence. After all the sieve boxes 32 are installed, pour the dried soil particles into the uppermost sieve box 32, then fix the cover body 33 to the uppermost sieve box 32. Then drive the movable plate 12 to vibrate through the vibration driving member 11, thereby driving each sieve box 32 to vibrate, so that the smaller soil particles in the largest sieve box 32 continuously fall, and soil particles of different particle sizes enter the corresponding sieve boxes 32. After the screening is completed, after each sieve box 32 stops vibrating, first remove the cover body 33, then detect the first weight of all the sieve boxes 32 above through the weighing sensor 2. Then remove the uppermost sieve box 32, and detect the second weight of all the sieve boxes 32 above through the weighing sensor 2 again. Then the first weight minus the second weight is the weight of the uppermost sieve box 32 (with materials), and then subtract the self-weight of the uppermost sieve box 32 to obtain the weight of the soil particles in the uppermost sieve box 32. And so on, remove each sieve box 32 in sequence, obtain the weight of the removed sieve box 32 according to the weight difference before and after disassembly, and then subtract the self-weight to obtain the weight of the materials in the removed sieve box 32.

[0038] The utility model measures the weight difference of each sieve box 32 before and after disassembly through the weighing sensor 2, so as to obtain the weight of each sieve box 32. After subtracting the self-weight of the sieve box 32, the weight of the soil particles in each sieve box 32 can be obtained. It is not necessary to pour the soil particles in the sieve box 32 onto the weighing platform for weighing, which can improve the experimental efficiency. At the same time, the device directly detachably fixes the cover body 33 to the uppermost sieve box 32, so that it is not necessary to set up structures such as pressing plates and locking screws to fix the cover body 33, which can reduce the equipment cost, simplify the operation steps, and improve the convenience of use.

[0039] In one embodiment, please refer to Figure 3 , the vibration driving member 11 includes a bottom box 111, a fixing plate 112 and a vibrator 113. A through hole 1111 is formed in the upper end surface of the bottom box 111. The fixing plate 112 is fixed in the bottom box 111. The movable plate 12 is fixed above the fixing plate 112 via a plurality of first elastic members 114. The vibrator 113 is connected to the movable plate 12 and is used to drive the movable plate 12 to vibrate. During use, the vibrator 113 drives the movable plate 12 to vibrate, and the movable plate 12 drives each sieve box 32 to vibrate.

[0040] In one embodiment, please refer to Figure 3 , the detection end of the weighing sensor 2 is fixedly connected to the mounting plate 31 via a plurality of connecting columns 21.

[0041] In one embodiment, see Figure 3 , Figure 4 and Figure 6 , two first plug blocks 311 are fixed on the mounting plate 31, and a first locking hole 3111 is formed on the first plug block 311, and a first lock body 321 is fixed on the outer wall of each of the sieve boxes 32, and the first lock body 321 includes a first locking block 3211, a first slider 3212, a first locking rod 3213, a first lever 3214 and a second elastic member 3215, and the first locking block 3211 is fixed to the outer wall of the sieve box 32, and a first through hole 32111 is formed on the first locking block 3211 for the first plug block 311 to pass through, and a first through hole 3211 is formed in the first locking block 3211 1, the first locking block 3211 is further provided with a first giving way groove 32113 which is in communication with the first sliding groove 32112, the first locking rod 3213 is fixed to the first sliding block 3212 and is used to be inserted into the first locking hole 3111, the first lever 3214 is fixed to the first sliding block 3212 and extends to the outside of the first sliding groove 32112 via the first giving way groove 32113, one end of the second elastic member 3215 is connected to the inner wall of the first sliding groove 32112, and the other end of the second elastic member 3215 is connected to the first sliding block 3212.

[0042] Preferably, an upper surface of the first inserting block 311 is an inclined surface, and the inclined surface faces the first locking rod 3213 .

[0043] When the sieve box 32 with the largest mesh number needs to be fixed on the mounting plate 31, the two first plug blocks 311 of the sieve box 32 with the largest mesh number are respectively held tightly by two hands and placed on the mounting plate 31, and the two first plug blocks 311 are respectively inserted into the first through holes 32111 of the two first plug blocks 311. Since the upper surface of the first plug block 311 is an inclined surface, when the upper surface of the first plug block 311 contacts the first locking rod 3213, the first locking rod 3213 is pushed to move inward, and the first plug block 311 continues to be inserted. When the first locking rod 3213 contacts the first locking hole 3111 of the first plug block 311, the first locking rod 3213 is sunk into the first locking hole 3111, thereby locking the first plug block 311 and fixing the sieve box 32 with the largest mesh number on the mounting plate 31. When the two need to be separated, first hold the two first plug blocks 311 of the screen box 32 with both hands, and use the thumb to move the first lever 3214, so that the first lever 3214 drives the first slider 3212 to move inward, so that the first locking rod 3213 moves inward, thereby disengaging from the first locking hole 3111, and then lift the screen box 32.

[0044] In one embodiment, see Figures 3 - 5 Two second plug blocks 322 are fixed to the outer side wall of each of the sieve boxes 32, and a second locking hole 3221 is opened on the second plug block 322. The upper surface of the second plug block 322 is an inclined surface, and the inclined surface faces the first locking rod 3213. When the upper sieve box 32 is buckled into the lower sieve box 32, the second plug block 322 on the lower sieve box 32 is inserted into the first through hole 32111 of the first lock body 321 on the upper sieve box 32, and the first locking rod 3213 corresponding to the upper sieve box 32 is inserted into the second locking hole 3221 of the second plug block 322 of the lower sieve box 32, thereby achieving fixed locking of the two adjacent sieve boxes 32.

[0045] In one embodiment, see Figure 3 and Figure 5 The outer side wall of the cover body 33 is fixed with a second lock body 331, and the second lock body 331 includes a second lock block 3311, a second slider 3312, a second lock rod 3313, a second lever 3314 and a third elastic member 3315. The second lock block 3311 is fixed to the outer side wall of the cover body 33, and the second lock block 3311 is provided with a second through hole for the second plug block 322 corresponding to the topmost sieve box 32 to pass through. The second lock block 3311 is formed with a second slide groove 33112 connected to the second through hole, and the second lock block 3311 is also provided with a There is a second yielding groove 33113 connected with the second slide 33112, the second locking rod 3313 is fixed to the second slider 3312, and is used to be inserted into the second locking hole 3221 corresponding to the uppermost screen box 32, the second lever 3314 is fixed to the second slider 3312, and extends to the outside of the second slide 33112 via the second yielding groove 33113, one end of the third elastic member 3315 is connected to the inner wall of the second slide 33112, and the other end of the third elastic member 3315 is connected to the second slider 3312. When in use, when the cover body 33 is buckled with the uppermost screen box 32, the second plug block 322 corresponding to the uppermost screen box 32 is inserted into the second perforation, and the second locking rod 3313 is inserted into the second locking hole 3221 corresponding to the uppermost screen box 32, so as to realize the fixing and locking of the cover body 33 and the uppermost screen box 32. The disassembly method of the two is similar to the above, and it will not be repeated here.

[0046] In one embodiment, see Figure 3 and Figure 4, a positioning ring 312 is fixed on the mounting plate 31; a first embedded ring 323 is formed on the lower end surface of each sieve box 32, and the first embedded ring 323 of the lowermost sieve box 32 is used to be embedded in the positioning ring 312, and the first embedded ring 323 of each sieve box 32 is used to be embedded in the upper opening of the lower-layer sieve box 32, so as to position and limit each sieve box 32 and improve stability.

[0047] In one embodiment, please refer to Figure 3 and Figure 5 , a second embedded ring 332 is formed on the lower end surface of the cover body 33, and the second embedded ring 332 is used to be embedded in the upper opening of the uppermost sieve box 32.

[0048] In one embodiment, please refer to Figure 1 , Figure 3 and Figure 6 , the soil sieve further includes a tensioning mechanism 4, the tensioning mechanism 4 includes a first hanging ring 41, a connecting block 42, a pulling rope 43 and a first hook 44, the first hanging ring 41 is fixed on the outer edge of the mounting plate 31, the connecting block 42 is fixed on the cover body 33, one end of the pulling rope 43 is detachably fixed on the connecting block 42, the other end of the pulling rope 43 is fixedly connected with the first hook 44, and the first hook 44 is used to be hung on the corresponding first hanging ring 41. When in use, after each sieve box 32 and the cover body 33 are installed and fixed, the first hooks 44 on each pulling rope 43 are hung on the corresponding first hanging rings 41, so as to realize the pressing of all sieve boxes 32 and the cover body 33. In this way, even if some locking mechanisms fail or are not locked in place, the cover body 33 or the sieve box 32 will not fall off, improving safety.

[0049] In this embodiment, a second hook 45 is fixed at one end of the pulling rope 43, and a second hanging ring 46 is fixed on the connecting block 42. The second hook 45 can be hung on the second hanging ring 46, so as to realize the detachable fixing of one end of the pulling rope 43 on the connecting block 42. In addition, since the required lengths of the pulling ropes 43 are different when the numbers of the sieve boxes 32 are different, in a preferred embodiment, the device is equipped with a variety of pulling ropes 43 with different length specifications (each length specification corresponds to 4 pulling ropes), and various specifications of the pulling ropes 43 respectively correspond to the corresponding numbers of the sieve boxes 32, and the pulling ropes 43 can be labeled with the numbers of the corresponding sieve boxes 32. In this way, when the user operates specifically, according to the number of the stacked sieve boxes 32, the corresponding specification of the pulling rope 43 can be quickly found to press the whole device.

[0050] To better understand the present invention, the following is combined with Figures 1 to 7The technical solution of the present utility model will be described in detail: During use, first accurately measure the weight of each sieve box 32 when it is not loaded with materials. Then fix the sieve box 32 with the largest mesh number on the mounting plate 31, and fix the sieve box 32 with the second largest mesh number above the sieve box 32 with the largest mesh number, and so on. Continuously fix the sieve boxes 32 with smaller mesh numbers in sequence. After all the sieve boxes 32 are installed, pour the dried soil particles into the uppermost sieve box 32. Then fix the cover body 33 to the uppermost sieve box 32. Next, drive the movable plate 12 to vibrate through the vibration driving member 11, thereby driving each sieve box 32 to vibrate, so that the smaller soil particles in the largest sieve box 32 continuously fall, and soil particles of different particle sizes enter the corresponding sieve boxes 32. After the screening is completed, after each sieve box 32 stops vibrating, first remove the cover body 33, and then detect the first weight of all the sieve boxes 32 above through the weighing sensor 2. Then remove the uppermost sieve box 32, and again detect the second weight of all the sieve boxes 32 above through the weighing sensor 2. Then the first weight minus the second weight is the weight of the uppermost sieve box 32 (with materials), and then subtracting the self-weight of the uppermost sieve box 32 can obtain the weight of the soil particles in the uppermost sieve box 32. And so on, remove each sieve box 32 in sequence, obtain the weight of the removed sieve box 32 according to the weight difference before and after removal, and then subtract the self-weight to obtain the weight of the materials in the removed sieve box 32.

[0051] The present utility model measures the weight difference of each sieve box 32 before and after disassembly through the weighing sensor 2, so as to obtain the weight of each sieve box 32. After subtracting the self-weight of the sieve box 32, the weight of the soil particles in each sieve box 32 can be obtained. It is not necessary to pour the soil particles in the sieve box 32 onto the weighing platform for weighing, which can improve the experimental efficiency. At the same time, the device directly detachably fixes the cover body 33 to the uppermost sieve box 32, so that it is not necessary to set up structures such as pressing plates and locking screws to fix the cover body 33, which can reduce the equipment cost, simplify the operation steps, and improve the convenience of use.

[0052] The above specific implementation manners of the present utility model do not constitute a limitation on the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A soil sifter, characterized in that: include: A vibration mechanism, the vibration mechanism comprising a vibration driving member and a movable plate, the vibration driving member being connected to the movable plate and used to drive the movable plate to vibrate; a weighing sensor, wherein a fixed end of the weighing sensor is fixed to the movable plate; and The screening mechanism includes a mounting plate, a plurality of screen boxes and a cover body, the mounting plate is fixed to the detection end of the weighing sensor, a screen is fixed in each screen box, and each screen box is arranged in sequence above the mounting plate from bottom to top, and two adjacent screen boxes are detachably fixedly connected, the lowest screen box is detachably fixed to the mounting plate, and the cover body is detachably fixed to the highest screen box.

2. The soil sifter according to claim 1, characterized in that: The vibration driving component includes a bottom box, a fixed plate and an exciter. A through hole is opened on the upper end surface of the bottom box. The fixed plate is fixed in the bottom box. The movable plate is fixed above the fixed plate via a plurality of first elastic members. The exciter is connected to the movable plate and is used to drive the movable plate to vibrate.

3. The soil sifter according to claim 1, characterized in that: The detection end of the weighing sensor is fixedly connected to the mounting plate via a plurality of connecting columns.

4. The soil sifter according to claim 1, characterized in that: Two first plug blocks are fixed on the mounting plate, and the first plug block is provided with a first locking hole, and the outer side wall of each of the screen boxes is fixed with a first lock body, the first lock body includes a first locking block, a first sliding block, a first locking rod, a first lever and a second elastic member, the first locking block is fixed to the outer side wall of the screen box, the first locking block is provided with a first through-hole for allowing the first plug block to pass through, a first sliding groove connected to the first through-hole is formed in the first locking block, and a first yielding groove connected to the first sliding groove is also formed on the first locking block, the first locking rod is fixed to the first sliding block and is used to be inserted in the first locking hole, the first lever is fixed to the first sliding block and extends to the outside of the first sliding groove via the first yielding groove, one end of the second elastic member is connected to the inner wall of the first sliding groove, and the other end of the second elastic member is connected to the first sliding block.

5. The soil sifter according to claim 4, characterized in that: The upper surface of the first inserting block is an inclined surface, and the inclined surface faces the first locking rod.

6. The soil sifter according to claim 4, characterized in that: Two second plug blocks are fixed to the outer wall of each of the screen boxes, and a second locking hole is formed on the second plug block. The upper surface of the second plug block is an inclined surface, and the inclined surface faces the first locking rod. When the upper screen box is buckled with the lower screen box, the second plug block on the lower screen box is inserted into the first through hole of the first lock body on the upper screen box, and the first locking rod corresponding to the upper screen box is inserted into the second locking hole of the second plug block of the lower screen box.

7. The soil sifter according to claim 6, characterized in that: A second lock body is fixed to the outer wall of the cover body, the second lock body includes a second lock block, a second slider, a second lock rod, a second lever and a third elastic member, the second lock block is fixed to the outer wall of the cover body, the second lock block is provided with a second through hole for the second plug block corresponding to the uppermost screen box to pass through, a second slide groove connected to the second through hole is formed in the second lock block, and a second yield groove connected to the second slide groove is also formed on the second lock block, the second lock rod is fixed to the second slider and is used to be inserted in the second lock hole corresponding to the uppermost screen box, the second lever is fixed to the second slider and extends to the outside of the second slide groove via the second yield groove, one end of the third elastic member is connected to the inner wall of the second slide groove, and the other end of the third elastic member is connected to the second slider.

8. The soil sifter according to claim 1, characterized in that: A positioning ring is fixed on the mounting plate; A first embedded ring is formed on the lower end surface of each of the sieve boxes, the first embedded ring of the bottom sieve box is used to be embedded in the positioning ring, and the first embedded ring of each sieve box is used to be embedded in the upper end opening of the sieve box of the next layer.

9. The soil sifter according to claim 8, characterized in that: A second embedded ring is formed on the lower end surface of the cover body, and the second embedded ring is used to be embedded in the upper end opening of the uppermost screen box.

10. The soil sifter according to claim 1, characterized in that: It also includes a tensioning mechanism, which includes a first hanging ring, a connecting block, a pull rope and a first hook, the first hanging ring is fixed to the outer edge of the mounting plate, the connecting block is fixed to the cover body, one end of the pull rope is detachably fixed to the connecting block, the other end of the pull rope is fixedly connected to the first hook, and the first hook is used to be hung on the corresponding first hanging ring.

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