Soil remediation particle screening device

Abstract

The invention relates to the technical field of soil remediation, in particular to a soil remediation particle screening device which comprises a screening box, a feeding port is formed in the top of the screening box, primary screening discharging ports are obliquely formed in the left side and the right side of the middle of the screening box, and a fine screening discharging port is obliquely formed in the front side of the lower portion of the screening box. The crushing mechanism is arranged on the upper portion of the interior of the screening box, the screening mechanism is arranged below the crushing mechanism, and the cleaning mechanism is arranged in the screening mechanism. The meshed transmission of the toothed wheel is matched to ensure the crushing uniformity, and the impact of large-particle impurities on the screen is reduced from the source; through the primary screening assembly and the lower fine screening assembly, the overall screening efficiency is improved; the right cleaning mechanism drives a cleaning rod to reciprocate through a lead screw, bristles clean the surface of the lower screen in real time, and fine particles are prevented from being embedded into the screen to block the screen.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a soil remediation particle screening device. Background Art

[0002] Existing soil remediation particle screening devices usually work in a single-layer combination of mechanical vibration: the soil to be screened is evenly spread on the inclined surface of the screen through the feed port. The screen is made of metal wire or plastic. The bottom of the device is equipped with a small vibration No. 1 motor to generate low-frequency vibration to make soil particles jump on the screen surface for separation. Particles with a particle size smaller than the screen hole pass through the screen under the action of gravity and vibration and fall into the aggregate box below, while particles larger than the screen hole slide along the inclined surface of the screen to the coarse material collection port.

[0003] Currently, some soil screening devices adopt a single-layer screening structure and can only achieve coarse particle size classification, resulting in fine particles mixed with soil of adjacent particle sizes and small-sized materials mixed in coarse particles, making it difficult to meet high-precision separation requirements; at the same time, due to the lack of a pre-crushing module or a progressive filtration design of a multi-stage screen, lumps, stones or fibrous impurities in the soil directly impact the screen, which not only easily gets stuck in the mesh and forms a blockage, but also causes the screen to deform due to excessive local load, forcing the equipment to be frequently shut down for cleaning, ultimately resulting in a significant drop in screening efficiency and poor continuous operation stability. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a soil remediation particle screening device, which is achieved through the following technical solutions.

[0005] A soil remediation particle screening device comprises a screening box, wherein the top of the screening box is provided with a feed port, the left and right sides of the middle of the screening box are obliquely provided with primary screening discharge ports, and the front side of the lower part of the screening box is obliquely provided with a fine screening discharge port, and further comprises:

[0006] Crushing mechanism: The crushing mechanism is arranged above the inside of the screening box and is used to crush the agglomerated soil to make it meet the screening conditions.

[0007] Screening mechanism: The screening mechanism is arranged below the crushing mechanism. The screening mechanism is used to distinguish soil particles of different particle sizes to improve screening efficiency.

[0008] Cleaning mechanism: The cleaning mechanism is arranged in the screening mechanism, and is used to clean the soil particles on the screen to prevent the screen from being blocked and affecting the screening efficiency.

[0009] Furthermore, the crushing mechanism consists of a No. 1 motor, a crushing roller and a toothed wheel; a support plate is fixedly connected to the upper left front side of the screening box, the No. 1 motor is fixed to the support plate, and a rotating rod is fixed to the rear output shaft of the No. 1 motor, the rotating rod passes through the screening box and is rotatably connected to the rear plate of the screening box, the crushing roller is fixed to the rotating rod and is located in the screening box, the toothed wheel is fixed to the rear side of the rotating rod, and the crushing roller, rotating rod and toothed wheel are symmetrically arranged in a pair, and both ends of the left rotating rod are rotatably connected to the wall of the screening box, and the two toothed wheels are engaged with each other.

[0010] Furthermore, the screening mechanism consists of a primary screening component and a fine screening component; the primary screening component consists of an upper screen and an upper cam; the upper screen is an inverted V-shaped design, with a high middle and low sides, and the screening box is provided with sliding grooves on both sides corresponding to the upper screen, and fixed rods are fixed at both ends of the sliding grooves. The two sides of the upper screen are slidably connected to the fixed rods, and a spring is provided between the upper part of the upper screen and the fixed rod. A top bar is fixed to the middle bottom of the upper screen, and a rotating shaft is provided below the top bar. The rotating shaft passes through the screening box and is rotatably connected to the box wall. There is a pair of upper cams that are symmetrically fixed to the rotating shaft front and back, and the top of the upper cam abuts against the bottom of the top bar.

[0011] Furthermore, the fine screening assembly includes a lower screen, a lower protrusion and a collecting box; the lower screen is located below the rotating shaft, and the lower screen is tilted from back to front. The front and rear sides of the lower screen are connected to the screening box and are consistent with the upper screen. The screen is limited by a fixed rod and a spring. A rotating rod passing through the rear side plate of the screening box is provided below the lower screen, the lower protrusion is fixed to the front end of the rotating rod, and the top of the lower cam abuts against the bottom of the lower screen. The collecting box is located below the rotating rod, and the collecting box is slidably connected to the bottom of the rear side of the screening box. A handle is fixed to the rear side of the collecting box.

[0012] Furthermore, the cleaning mechanism consists of a No. 2 motor, a screw and a cleaning rod; a fixed plate is fixedly connected to the lower portion of the primary screening outlet on the right side of the screening box, the No. 2 motor is fixedly connected to the fixed plate, the screw is fixedly connected to the output shaft on the left side of the No. 2 motor, a slider is rotatably connected to the screw, a movable frame is provided outside the screw and the slider, the movable frame opens downward, the cleaning rod is fixedly connected to the bottom of the slider and the cleaning rod and the lower screen are arranged parallel, and a brush is provided at the bottom of the cleaning rod.

[0013] Furthermore, the left rotating rod in the left rotating shaft passes through the front side of the screening box, the front end of the left rotating rod is fixedly connected to the No. 1 sprocket, the front end of the rotating shaft passing through the front side of the screening box is fixedly connected to the No. 2 sprocket, and the No. 1 sprocket and the No. 2 sprocket are connected by a No. 1 chain transmission.

[0014] Furthermore, the rear end of the rotating shaft passing through the rear side of the screening box is fixedly connected to the third sprocket, the rear end of the rotating rod passing through the rear side of the screening box is fixedly connected to the fourth sprocket, and the third sprocket and the fourth sprocket are connected by a second chain transmission.

[0015] Furthermore, triangular guide blocks are fixed to the top of the movable frame and the top of the cleaning rod, self-locking universal wheels are fixed to the four corners of the bottom of the screening box, and a push-pull rod is fixed to the lower rear side of the screening box.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention uses the top crushing mechanism to use the double crushing rollers to rotate in opposite directions to crush the agglomerated soil, and the toothed wheel meshing transmission ensures the uniformity of crushing, thus reducing the impact of large particles of impurities on the screen from the source;

[0018] 2. The present invention adopts an inverted V-shaped upper screen and a cam vibration structure in the middle primary screening component, which allows the material to quickly separate coarse particles in bidirectional sliding, and the inclined discharge port guides the directional discharge of large-size materials; the lower fine screening component forms high-frequency vibration screening through the intermittent lifting effect of the lower screen and the cam, and cooperates with the sprocket chain drive to achieve synchronous linkage between the primary screening and the fine screening, thereby improving the overall screening efficiency;

[0019] 3. The present invention uses a screw to drive the cleaning rod to move back and forth through the right cleaning mechanism, and the bristles clean the surface of the lower screen in real time to prevent fine particles from embedding and clogging the screen. Combined with the sliding collection box, it is convenient for quickly cleaning the fine screening products; in addition, the self-locking universal wheels and push-pull rod design at the bottom of the device enhance the mobility, and the triangular guide block optimizes the operating stability of the cleaning mechanism, ultimately forming a full-process solution from crushing, grading to anti-blocking, which significantly improves the accuracy and sustainable operation capacity of soil remediation screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 : A three-dimensional diagram of a soil remediation particle screening device according to the present invention;

[0022] Figure 2 : An internal perspective view of a soil remediation particle screening device according to the present invention;

[0023] Figure 3 : A perspective view of the interior lower portion of a soil remediation particle screening device according to the present invention;

[0024] Figure 4 : A three-dimensional diagram of the screen of a soil remediation particle screening device according to the present invention;

[0025] Figure 5 : A front view of a soil remediation particle screening device according to the present invention;

[0026] Figure 6 : A right view of a soil remediation particle screening device according to the present invention.

[0027] The reference numerals are as follows:

[0028] 1- screening box, 11- feeding port, 12- primary screening outlet, 13- fine screening outlet, 14- guide block, 15- self-locking universal wheel, 16- push-pull rod, 21- No. 1 motor, 22- crushing roller, 23- toothed wheel, 24- support plate, 25- rotating rod, 26- No. 1 sprocket, 27- No. 2 sprocket, 28- No. 1 chain, 29- No. 3 sprocket, 211- No. 4 sprocket, 212- No. 2 chain, 31- upper screen, 32- upper cam, 33- sliding groove, 34- fixed rod, 35- spring, 36- top bar, 37- rotating shaft, 38- lower screen, 39- lower bump, 311- collecting box, 312- rotating rod, 313- handle, 41- No. 2 motor, 42- screw rod, 43- cleaning rod, 44- slider, 45- moving frame. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1, please refer to the accompanying drawings, the present invention provides a technical solution:

[0031] A soil remediation particle screening device, such as Figure 1-2 As shown, it includes a screening box 1, which is characterized in that: a feed port 11 is provided on the top of the screening box 1, primary screening discharge ports 12 are obliquely provided on the left and right sides of the middle of the screening box 1, and a fine screening discharge port 13 is obliquely provided on the front side of the lower part of the screening box 1, and further includes;

[0032] Crushing mechanism: The crushing mechanism is arranged above the interior of the screening box 1 and is used to crush the agglomerated soil to make it meet the screening conditions.

[0033] Screening mechanism: The screening mechanism is arranged below the crushing mechanism. The screening mechanism is used to distinguish soil particles of different particle sizes and improve the screening efficiency.

[0034] Cleaning mechanism: The cleaning mechanism is arranged in the screening mechanism. The cleaning mechanism is used to clean the soil particles on the screen to prevent the screen from being blocked and affecting the screening efficiency.

[0035] The top of the moving frame 45 and the top of the cleaning rod 43 are fixedly connected with triangular guide blocks 14, the four corners of the bottom of the screening box 1 are fixedly connected with self-locking universal wheels 15, and a push-pull rod 16 is fixedly connected to the lower rear side of the screening box 1.

[0036] First, pour the soil to be screened from the feed port 11 at the top of the screening box 1. After the soil enters the upper part of the interior, the agglomerated soil is crushed by the crushing mechanism; the crushed soil falls to the screening mechanism for screening. During the screening process, the cleaning mechanism is started to clean the screening mechanism to prevent blockage. The triangular guide block 14 on the top of the moving frame 45 and the cleaning rod 43 can prevent soil accumulation; when the equipment needs to be moved, it can be moved by the push-pull rod 16 and the self-locking universal wheel 15.

[0037] Example 2: The structure of this example is basically the same as that of Example 1, except that Figure 2-4 As shown, the crushing mechanism consists of a No. 1 motor 21, a crushing roller 22 and a toothed wheel 23; a support plate 24 is fixedly connected to the upper left front side of the screening box 1, the No. 1 motor 21 is fixedly connected to the support plate 24, and a rotating rod 25 is fixedly connected to the output shaft on the rear side of the No. 1 motor 21. The rotating rod 25 passes through the screening box 1 and is rotatably connected to the rear plate of the screening box 1. The crushing roller 22 is fixedly connected to the rotating rod 25 and is located in the screening box 1. The toothed wheel 23 is fixedly connected to the rear side of the rotating rod 25. The crushing roller 22, the rotating rod 25 and the toothed wheel 23 are symmetrically arranged in a pair. Both ends of the left rotating rod 25 are rotatably connected to the wall of the screening box 1, and the two toothed wheels 23 are engaged with each other.

[0038] Through the above-mentioned improved setting of the crushing mechanism, when the soil remediation particle screening device is actually used, after the soil to be screened is put into the feed port 11 at the top of the screening box 1, the No. 1 motor 21 fixed to the support plate 24 is started, and the rear output shaft of the No. 1 motor 21 drives the rotating rod 25 fixed thereto to rotate. Since the rotating rod 25 passes through the screening box 1 and is rotationally connected to the rear plate of the screening box 1, and at the same time, both ends of the left rotating rod 25 are rotationally connected to the wall of the screening box 1, the stability of the rotation of the rotating rod 25 is ensured. When the rotating rod 25 rotates, it drives the crushing roller 22 fixed thereto and the toothed wheel 23 on the rear side to rotate together. Because the two toothed wheels 23 are engaged with each other, the other rotating rod 25 will also drive the crushing roller 22 on it to rotate in the opposite direction. In this way, a pair of crushing rollers 22 rotate relative to each other, and forcibly crush the incoming agglomerated soil so that the soil particles meet the conditions for subsequent screening. The crushed soil falls to the screening mechanism below under the action of gravity, making full preparations for subsequent accurate and efficient screening work, and effectively avoiding problems such as inaccurate screening and low efficiency caused by soil agglomeration.

[0039] Example 3: The structure of this embodiment is basically the same as that of Example 1, except that Figure 2-6 As shown, the screening mechanism consists of a primary screening assembly and a fine screening assembly; the primary screening assembly consists of an upper screen 31 and an upper cam 32; the upper screen 31 is designed in an inverted V shape, with a high middle and low sides, and the screening box 1 is provided with sliding grooves 33 on both sides of the upper screen 31, and fixed rods 34 are fixed at both ends of the sliding grooves 33. The two sides of the upper screen 31 are slidably connected to the fixed rods 34, and a spring 35 is provided between the upper part of the upper screen 31 and the fixed rod 34. The top bottom of the upper screen 31 is fixed with a top bar 33. 6. A rotating shaft 37 is provided below the top bar 36. The rotating shaft 37 passes through the screening box 1 and is rotatably connected to the box wall. The upper cam 32 has a pair of symmetrical front and rear fixed to the rotating shaft 37. The top of the upper cam 32 abuts against the bottom of the top bar 36. The fine screening assembly includes a lower screen 38, a lower protrusion 39 and a collecting box 311. The lower screen 38 is located below the rotating shaft 37. The lower screen 38 is tilted from the back to the front. The front and rear sides of the lower screen 38 are connected to the screening box 1 and the upper screen 3 1, the screen is limited by the fixing rod 34 and the spring 35, and a rotating rod 312 is provided below the lower screen 38, which passes through the rear side plate of the screening box 1. The lower protrusion 39 is fixed to the front end of the rotating rod 312, and the top of the lower cam abuts the bottom of the lower screen 38. The collection box 311 is located below the rotating rod 312, and the collection box 311 is slidably connected to the bottom of the rear side of the screening box 1. A handle 313 is fixed to the rear side of the collection box 311; the cleaning mechanism includes a second motor 41, a screw rod 42 and A cleaning rod 43 is composed of: a fixed plate fixed below the primary screening outlet 12 on the right side of the screening box 1, the No. 2 motor 41 is fixed to the fixed plate, the screw rod 42 is fixed to the left output shaft of the No. 2 motor 41, and a slider 44 is rotatably connected to the screw rod 42. A movable frame 45 is provided outside the screw rod 42 and the slider 44, and the movable frame 45 opens downward. The cleaning rod 43 is fixed to the bottom of the slider 44 and the cleaning rod 43 and the lower screen 38 are arranged parallel to each other, and a brush is provided at the bottom of the cleaning rod 43.

[0040] With the above-mentioned improvements to the screening mechanism and cleaning mechanism, when the soil remediation particle screening device is actually used, after the crushing mechanism breaks up the agglomerated soil, the soil falls into the screening mechanism. At this time, the rotating shaft 37 begins to rotate, driving the pair of upper cams 32 symmetrically fixed to it front and back to rotate. Since the top of the upper cam 32 abuts below the top bar 36 fixed to the middle bottom of the upper screen 31, and the two sides of the upper screen 31 are slidably connected to the fixed rod 34 in the sliding groove 33, a spring 35 is provided between the top and the fixed rod 34. When the upper cam 32 rotates, it periodically lifts the top bar 36, causing the upper screen 31 to vibrate up and down under the action of the spring 35. The upper screen 31 adopts an inverted V-shaped design, with a high center and low sides. This structure allows the soil to be more evenly dispersed to the sides during vibration. Soil particles with larger particle sizes cannot pass through the upper screen 31 and will slide along the inclined upper screen 31 to the primary screening outlet 12 on the left and right sides of the middle of the screening box 1 for discharge. The soil that has passed the initial screening continues to fall into the fine screening assembly. The rotation of the rotating rod 312 drives the lower protrusion 39 fixed to its front end to rotate. The top of the lower protrusion 39 abuts the bottom of the lower screen 38. The front and rear sides of the lower screen 38 are connected to the screening box 1 in the same manner as the upper screen 31. The lower protrusion 39 is held in place by the fixing rod 34 and the spring 35. The rotation of the lower protrusion 39 causes the lower screen 38 to vibrate up and down. The lower screen 38 is tilted from back to front. Fine soil particles that meet the required particle size pass through the lower screen 38 and fall into the collection box 311 below. Slightly larger particles slide along the lower screen 38 and are discharged into the fine screening outlet 13 at the lower front of the screening box 1. The collection box 311 is slidably connected to the bottom rear of the screening box 1. The handle 313 on the rear side allows for easy removal of the collection box 311 to collect and process the screened soil. During the screening process, a cleaning mechanism is activated to prevent the lower screen 38 from becoming clogged with soil particles. The second motor 41 starts, driving the screw 42 fixed to its left output shaft to rotate, and the slider 44 connected to the screw 42 moves accordingly. Since the cleaning rod 43 is fixed to the bottom of the slider 44 and is arranged parallel to the lower screen 38, and the bottom of the cleaning rod 43 is also provided with bristles, when the slider 44 moves, it drives the cleaning rod 43 to move back and forth on the lower screen 38. The bristles clean the lower screen 38 and promptly remove the soil particles blocked on the screen, ensuring the continuity and efficiency of the screening work. The entire screening process achieves accurate screening of soil particles through the synergistic effect of multi-stage screening and cleaning mechanisms, effectively improving screening efficiency and screening quality.

[0041] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A soil remediation particle screening device, comprising a screening box (1), characterized in that: The screening box (1) is provided with a feed inlet (11) at the top, primary screening discharge ports (12) are obliquely provided on the left and right sides of the middle of the screening box (1), and a fine screening discharge port (13) is obliquely provided on the front side of the lower part of the screening box (1), and further comprises: Crushing mechanism: The crushing mechanism is arranged above the interior of the screening box (1) and is used to crush the agglomerated soil to make it meet the screening conditions. Screening mechanism: The screening mechanism is arranged below the crushing mechanism. The screening mechanism is used to distinguish soil particles of different particle sizes to improve screening efficiency. Cleaning mechanism: The cleaning mechanism is arranged in the screening mechanism, and is used to clean the soil particles on the screen to prevent the screen from being blocked and affecting the screening efficiency.

2. A soil remediation particle screening device according to claim 1, characterized in that: The crushing mechanism is composed of a No. 1 motor (21), a crushing roller (22) and a toothed wheel (23); a support plate (24) is fixedly connected to the upper left front side of the screening box (1), the No. 1 motor (21) is fixedly connected to the support plate (24), a rotating rod (25) is fixedly connected to the output shaft on the rear side of the No. 1 motor (21), the rotating rod (25) passes through the screening box (1) and is rotatably connected to the rear side plate of the screening box (1), the crushing roller (22) is fixedly connected to the rotating rod (25) and is located in the screening box (1), the toothed wheel (23) is fixedly connected to the rear side of the rotating rod (25), the crushing roller (22), the rotating rod (25) and the toothed wheel (23) are symmetrically arranged in a pair, both ends of the left rotating rod (25) are rotatably connected to the box wall of the screening box (1), and the two toothed wheels (23) are meshed with each other.

3. The soil remediation particle screening device according to claim 1, characterized in that: The screening mechanism is composed of a primary screening component and a fine screening component; the primary screening component is composed of an upper screen (31) and an upper cam (32); the upper screen (31) is designed in an inverted V shape, with a high middle and low sides, and the screening box (1) is provided with sliding grooves (33) on both sides corresponding to the upper screen (31), and fixed rods (34) are fixed at both ends of the sliding groove (33), and the two sides of the upper screen (31) are slidably connected to the fixed rods (34), and the upper screen ( A spring (35) is sleeved between the upper portion of the upper screen (31) and the fixed rod (34). A top bar (36) is fixedly connected to the middle bottom of the upper screen (31). A rotating shaft (37) is provided below the top bar (36). The rotating shaft (37) passes through the screening box (1) and is rotatably connected to the box wall. A pair of upper cams (32) are fixedly connected to the rotating shaft (37) in a front-to-back symmetrical manner. The top of the upper cam (32) abuts against the bottom of the top bar (36).

4. The soil remediation particle screening device according to claim 1, characterized in that: The fine screening assembly comprises a lower screen (38), a lower protrusion (39) and a collection box (311); the lower screen (38) is located below the rotating shaft (37); the lower screen (38) is tilted from back to front; the front and rear sides of the lower screen (38) are consistent with the connection between the screening box (1) and the upper screen (31); the screen is limited by a fixing rod (34) and a spring (35); a rotating rod (312) is provided below the lower screen (38) and passes through the rear side plate of the screening box (1); the lower protrusion (39) is fixed to the front end of the rotating rod (312); the top of the lower cam abuts against the bottom of the lower screen (38); the collection box (311) is located below the rotating rod (312); the collection box (311) is slidably connected to the rear bottom of the screening box (1); and a handle (313) is fixed to the rear side of the collection box (311).

5. The soil remediation particle screening device according to claim 1, characterized in that: The cleaning mechanism is composed of a No. 2 motor (41), a screw rod (42) and a cleaning rod (43); a fixed plate is fixedly connected to the lower side of the primary screening outlet (12) on the right side of the screening box (1), the No. 2 motor (41) is fixedly connected to the fixed plate, the screw rod (42) is fixedly connected to the output shaft on the left side of the No. 2 motor (41), a slider (44) is rotatably connected to the screw rod (42), a movable frame (45) is provided outside the screw rod (42) and the slider (44), the movable frame (45) opens downward, the cleaning rod (43) is fixedly connected to the bottom of the slider (44), and the cleaning rod (43) and the lower screen (38) are arranged in parallel, and a brush is provided at the bottom of the cleaning rod (43).

6. The soil remediation particle screening device according to claim 1, characterized in that: The left rotating rod (25) in the left rotating shaft passes through the front side of the screening box (1), the front end of the left rotating rod (25) is fixedly connected to the first sprocket (26), the front end of the rotating shaft (37) passing through the front side of the screening box (1) is fixedly connected to the second sprocket (27), and the first sprocket (26) and the second sprocket (27) are connected by a first chain (28).

7. The soil remediation particle screening device according to claim 1, characterized in that: The rotating shaft (37) passes through the rear end of the rear side of the screening box (1) and is fixedly connected to a third sprocket (29); the rotating rod (312) passes through the rear end of the rear side of the screening box (1) and is fixedly connected to a fourth sprocket (211); the third sprocket (29) and the fourth sprocket (211) are connected in transmission via a second chain (212).

8. The soil remediation particle screening device according to claim 1, characterized in that: The top of the movable frame (45) and the top of the cleaning rod (43) are both fixedly connected with triangular guide blocks (14), the four corners of the bottom of the screening box (1) are all fixedly connected with self-locking universal wheels (15), and the rear lower side of the screening box (1) is fixedly connected with a push-pull rod (16).

Images