Granular garbage vibratory screening test experiment table
By designing adjustable sandblasting and diversion mechanisms and crank adjustment components, diversified screening effects of the particle waste vibration screening test bench are achieved, the problem of unadjustable vibration parameters of existing equipment is solved, and the screening efficiency and evaluation accuracy are improved.
Patent Information
- Application Number
- CN202511067973.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-09-26
AI Technical Summary
The vibration screening system of existing beach cleaning equipment cannot flexibly adjust vibration parameters, resulting in reduced experimental evaluation of screening capacity and unsatisfactory screening efficiency and energy consumption.
A vibration screening test bench for granular garbage was designed. Through the adjustable sandblasting mechanism, diversion mechanism, vibrating screen mechanism and crank adjustment assembly, diversified vibration effects of the screen were achieved, including flexible adjustment of the rocker length and screen position, to ensure the precise separation of sand and garbage.
It improves the operational convenience and practicality of the screening system, enhances screening efficiency and quality, and ensures accurate assessment of screening capabilities.
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Figure CN120696069A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of garbage screening devices, and in particular to a particle garbage vibration screening test bench. Background Art
[0002] Litter left on beaches can pollute and damage the coastal environment, necessitating beach cleaning. Currently, domestic beach cleaning vehicles generally come in several types, including towed, walk-behind, and operated. Most use traditional power sources to power the entire machine, resulting in suboptimal efficiency and energy consumption. Existing filtration-based garbage collection equipment separates sand and garbage. For example, Chinese utility model patent publication number CN219218839U discloses a garbage collection device for a beach cleaning vehicle. The device comprises a vehicle body, solar panels, a sand-raising mechanism, a vibrating screen, a garbage collection bin, and a sand-leveling mechanism. The sand-raising mechanism transfers sand and garbage to the vibrating screen. A battery powers the vehicle's travel motor and the vibrating motor, which drives the vibrating screen in a periodic reciprocating motion, separating the sand and garbage and transferring the garbage to the garbage collection bin. The sand-leveling mechanism smoothes the beach after the vehicle has cleaned the sand. The solar panels continuously charge the battery, increasing its battery life. The core of this type of equipment is to use motor power to drive the crank mechanism, which in turn drives the screen mesh to vibrate, thereby filtering sand and garbage. To further improve the screening capabilities of the equipment's screening system, testing based on this type of equipment is necessary. However, due to the conventional connection structure between the various components, the vibration parameters cannot be flexibly adjusted, which reduces the testability and makes it difficult to effectively evaluate the screening system's screening capabilities. Summary of the Invention
[0003] The present invention aims to provide a particle waste vibration screening test bench. By conveniently adjusting the parameters of multiple mechanisms, the present invention can achieve different vibration effects, thereby enabling the evaluation of the screening capacity of the vibrating screen system. The bench has the advantages of easy operation and good practicality.
[0004] The technical solution of the present invention is as follows: a particle garbage vibration screening test bench comprises a main frame and a sub-frame, the sub-frame is provided with a sand blasting mechanism, one end of the main frame is provided with a diversion mechanism, the feed end of the diversion mechanism corresponds to the sand discharge end of the sand blasting mechanism; a vibrating screen mechanism is provided in the main frame, and the bottom of the main frame is provided with a gravel collection box and a garbage collection box corresponding to the discharge end of the vibrating screen mechanism; the vibrating screen mechanism comprises a main rod group in the main frame, the side of the main rod group is adjustably connected to the main frame, the end of the main rod group is provided with a rocker length adjustment assembly, the end of the main rod group is provided with a screen via the rocker length adjustment assembly, and the screen receives the material flowing out of the discharge end of the diversion mechanism; the upper end of the main frame is provided with a top plate with adjustable position, a screening motor is provided on the top plate, the protruding end of the screening motor is provided with a crank adjustment assembly, and the output end of the crank adjustment assembly is connected to the main rod group on one side.
[0005] In the above-mentioned particle garbage vibration screening test bench, the sandblasting mechanism includes a sandblasting support seat arranged on the sub-frame, a container box is provided on the sandblasting support seat, a motor support plate is provided at one end of the container box, and a sandblasting motor is provided on one side of the motor support plate; the output end of the sandblasting motor is connected to a plurality of screw rods arranged in the container box through a gear set, and the discharge port of the container box corresponds to the diversion mechanism.
[0006] In the aforementioned particle garbage vibration screening test bench, one end of the sandblasting support seat has a bayonet for clamping the sub-frame rod body, and one end of the sandblasting support is provided with multiple fixing nails near the bayonet, and one end of the fixing nails fits into the profile groove of the sub-frame.
[0007] In the aforementioned particle garbage vibration screening test bench, the diversion mechanism includes columns arranged on both sides of the main frame, on which a diversion moving block is provided, one end of the diversion moving block is hinged with an elastic block, a diversion main board is provided between the elastic blocks on both sides, and a reinforcement plate is provided on the diversion main board.
[0008] In the aforementioned particle garbage vibration screening test bench, the elastic block includes a main part and an auxiliary part hinged to one end of the diversion moving block. One end of the auxiliary part has a waist-shaped block, which is inserted into the groove of the main part. One end of the main part has a slot for clamping the diversion main board.
[0009] In the aforementioned particle garbage vibration screening test bench, the screen includes a screen frame, and movable shafts are provided at both ends of the screen frame, and the movable shafts are connected to the rocker length adjustment assembly; a replaceable mesh plate is connected to the screen frame via bolts.
[0010] In the aforementioned particle garbage vibration screening test bench, the side of the screen frame has a plurality of side holes for the movable shaft to pass through.
[0011] In the aforementioned particle garbage vibration screening test bench, the rocker length adjustment assembly includes an adjustment slot arranged in the main rod group, with clamping plates on both sides of the adjustment slot, a cross plate connected between the clamping plates, and a group of bolt members provided between the two clamping plates; one end of the movable shaft is arranged between the bolt members, and the end of the movable shaft is passed through the cross plate.
[0012] In the aforementioned particle garbage vibration screening test bench, the crank adjustment assembly includes a disc arranged at the output end of the screening motor, a swinging member is connected to the disc, and a plurality of sockets are provided at one end of the swinging member, and the sockets cooperate with the connecting rod at the upper end of the main rod group.
[0013] In the aforementioned particle garbage vibration screening test bench, the disc surface has multiple rows of countersunk holes, one end of the swinging member has multiple adjustment holes, and fixing screws are provided between the adjustment holes and the countersunk holes.
[0014] Compared with the prior art, the present invention has the following advantages: 1. In the experimental bench constructed by the present invention, the sand and gravel to be processed first enter the sandblasting mechanism, and after being acted upon by the mechanism, it falls accurately onto the screen along the guide mechanism. At this time, the screening motor starts and outputs strong power. The power is transmitted to the main rod group through the crank adjustment assembly, and then drives the main rod group to drive the screen to vibrate at high frequency. In this process, sand and soil that meet the particle size requirements will be smoothly screened and fall into the sand and gravel collection box below; while larger garbage cannot pass through the screen and eventually fall into the garbage collection box; the crank adjustment assembly in the present invention can flexibly and accurately adjust the length of the connecting rod and the crank; at the same time, with the help of the rocker length adjustment assembly, the installation position of the screen on the main rod group can be conveniently changed, and the position of the main rod group relative to the main frame can also be adjusted as needed; through the diversified adjustment of the parameters at these different structures, the experimental bench can present a rich variety of screening effects, thereby being able to accurately measure and evaluate the screening capacity of the vibrating screen system, which helps to gain a deeper understanding of the performance of the vibrating screen system and has the advantages of easy operation and good practicality.
[0015] 2. The sandblasting mechanism of the present invention adopts a spiral conveying structure to convey sand and gravel, which not only ensures the stability of the sand and gravel pushing process and effectively avoids undesirable phenomena such as jamming and blockage during the conveying process, but also performs excellently in the uniformity of pushing the material, which makes the flow and distribution of the sand and gravel entering the subsequent process more stable.
[0016] 3. The sand and gravel flowing out of the sand blasting mechanism is guided by the diversion mechanism, which greatly ensures the accuracy of the sand and gravel falling position, avoids problems such as poor screening effect caused by falling deviation, and effectively improves the working efficiency and screening quality of the entire vibration screening test bench. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a schematic diagram of the sandblasting mechanism; Figure 3 is a schematic diagram of a spiral rod; Figure 4 is a schematic diagram of the diversion mechanism; Figure 5 Schematic diagram of the elastic block; Figure 6 is a schematic diagram of a crank adjustment assembly; Figure 7 It is a structural diagram of the rocker length adjustment component; Figure 8 Schematic diagram of the structure of the screen.
[0018] Explanation of the symbols in the accompanying drawings: 1-main frame, 2-sub-frame, 3-sandblasting mechanism, 4-diversion mechanism, 5-vibrating screen mechanism, 6-gravel collection box, 7-garbage collection box, 8-main rod group, 9-rocker length adjustment assembly, 10-screen, 11-top plate, 12-screening motor, 13-crank adjustment assembly, 14-sandblasting support seat, 15-motor support plate, 16-sandblasting motor, 17-container box, 18-screw rod, 19-bayonet, 20-fixing nail , 21-column, 22-diversion moving block, 23-elastic block, 24-diversion main board, 25-reinforcement plate, 26-main part, 27-auxiliary part, 28-waist-shaped block, 29-card slot, 30-screen frame, 31-movable shaft, 32-mesh plate, 33-side hole, 34-adjustment slot, 35-cross plate, 36-bolt part, 37-disc, 38-swinging part, 39-jack, 40-sink hole, 41-adjustment hole, 42-fixing screw, 43-card plate. DETAILED DESCRIPTION
[0019] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.
[0020] Example: Granular garbage vibration screening test bench, including a main frame 1 and a sub-frame 2, as shown in the attached Figure 1As shown, a sandblasting mechanism 3 is installed on the sub-frame 2, and a diversion mechanism 4 is installed at one end of the main frame 1, and the feed end of the diversion mechanism 4 corresponds to the sand discharge end of the sandblasting mechanism 3; a vibrating screen mechanism 5 is installed in the main frame 1, and a gravel collection box 6 and a garbage collection box 7 corresponding to the discharge end of the vibrating screen mechanism 5 are installed at the bottom of the main frame 1; when the vibrating screen mechanism is running, the gravel will be screened, and the gravel passing through the screen will fall into the gravel collection box, and the garbage and part of the gravel will fall into the garbage collection box. Finally, the materials in the two collection boxes are weighed , the performance of the vibrating screen system is evaluated by comparing the weight of the sand sifted out of the gravel collection box, the weight of the garbage and a small amount of gravel in the garbage collection box. If the garbage falls into the garbage collection box and there is less gravel, it can be determined that the set parameters are more effective; the vibrating screen mechanism 5 includes a main rod group 8 set in the main frame 1, and the side of the main rod group 8 is adjustably connected to the main frame 1. Plates are installed on both sides of the main frame, and the plates have multiple through holes. The rotating shafts on both sides of the main rod group can be inserted into the through holes at different positions of the side plates of the main frame to adjust the installation height of the main rod group. A rocker length adjustment component 9 is installed at the end of the main rod group 8. A screen 10 is installed at the end of the main rod group 8 through the rocker length adjustment component 9. The screen 10 receives the material flowing out of the discharge end of the diversion mechanism 4; the diversion mechanism 4 includes columns 21 set on both sides of the main frame 1, as shown in the attached figure. Figure 4 As shown, a guide moving block 22 is installed on the column 21, and the guide moving block moves on the column and is adjusted to different height positions. One end of the guide moving block 22 is hinged with a tightening block 23, and a guide main board 24 is provided between the tightening blocks 23 on both sides. A reinforcement plate 25 is installed on the guide main board 24, and the tightening block is connected to the guide moving block with a bolt. Loosening the bolt can adjust the angle of the tightening block, thereby adjusting the angle of the guide main board and improving the flexibility of use; the tightening block 23 includes a main body 26 and an auxiliary part 27 hinged to one end of the guide moving block 22, as shown in the attached figure. Figure 5 As shown, one end of the auxiliary part 27 has a waist-shaped block 28, which is inserted into the groove of the main part 26. One end of the main part 26 has a slot 29 for clamping the guide main board 24. The elastic block is constructed in a splicing form, which is convenient and quick to install. The reinforcement plate can make the installation of the guide main board more stable. The upper end of the main frame 1 is installed with an adjustable top plate 11. The position of the top plate can be moved and positioned on the upper surface of the main frame according to actual conditions. A screening motor 12 is installed on the top plate 11. The protruding end of the screening motor 12 is connected to a crank adjustment assembly 13. An adjustable structure is used between the upper end of the main rod group and the main frame to adapt to the adjustment of the crank adjustment assembly and the rocker length adjustment assembly; the output end of the crank adjustment assembly 13 is connected to the main rod group 8 on one side. The screen 10 includes a screen frame 30, as shown in the attached Figure 8As shown, movable shafts 31 are installed at both ends of the screen frame 30, and the movable shafts 31 are connected to the rocker length adjustment assembly 9; a replaceable mesh plate 32 is connected to the screen frame 30 via bolts 36, and the bottom of the mesh plate 32 is mounted on the movable shaft 31, and the mesh plate can be replaced with a mesh plate of different apertures according to actual test requirements. The side of the screen frame 30 has a plurality of side holes 33 for the movable shaft 31 to pass through, and the position of the movable shaft can be installed on the side holes at different positions. The side of the mesh plate has a bayonet, through which the movable shaft can be clamped. Similarly, adjusting the position of the movable shaft will also enable the screen to obtain different amplitude effects; the crank adjustment assembly 13 includes a disc 37 arranged at the output end of the screening motor 12, and a swinging member 38 is connected to the disc 37. A plurality of jacks 39 are provided at one end of the swinging member 38, as shown in the attached figure. Figure 6 As shown, the socket 39 cooperates with the connecting rod at the upper end of the main rod group 8; the disk 37 has multiple rows of countersunk holes 40 on the disk surface, and one end of the swing member 38 has multiple adjustment holes 41, and a fixing screw 42 is installed between the adjustment hole 41 and the countersunk hole 40. The disk and the rod body at one end of the swing member form a crank structure, and there are multiple adjustment holes and countersunk holes, which can be matched, and the other end of the swing member has multiple sockets. The rods on the main rod group can be inserted into the sockets at different positions, forming a rocker structure here, so the entire crank adjustment assembly has a combined adjustment method, and the amplitude effect of the screen can also be affected by the adjustment of the structure here.
[0021] The sandblasting mechanism 3 includes a sandblasting support seat 14 provided on the sub-frame 2. Figure 2 As shown, a container box 17 is provided on the sandblasting support seat 14, one end of the container box 17 is installed with a motor support plate 15, and one side of the motor support plate 15 is installed with a sandblasting motor 16; the output end of the sandblasting motor 16 is connected to a plurality of screw rods 18 arranged in the container box 17 through a gear set, as shown in the attached Figure 3As shown, the discharge port of the container box 17 corresponds to the flow guide mechanism 4. There are three groups of spiral rods, so the protruding end of the sandblasting motor is connected to the middle spiral rod, and the other two spiral rods are set on both sides. The three spiral rods are driven by gears. In order to accurately control the amount of sandblasting, a pressure sensor is set at the bottom of the container box. The sand and gravel will fall into the container box. The feed end of the container box is in the shape of a cone bucket. The sandblasting mechanism uses a spiral conveying structure to convey the sand and gravel, which not only ensures the stability of the sand and gravel advancement process and effectively avoids the occurrence of undesirable phenomena such as jamming and blockage during the conveying process, but also performs excellently in terms of the uniformity of pushing the material, which makes the sand and gravel entering the subsequent process more stable in terms of flow and distribution. One end of the sandblasting support seat 14 has a bayonet 19 that clamps the rod body of the sub-frame 2. A plurality of fixing nails 20 are installed near the bayonet 19 at one end of the sandblasting support seat 14. One end of the fixing nail 20 fits into the profile groove of the sub-frame 2. The sandblasting support seat can move laterally on the sub-frame to improve the flexibility of use.
[0022] The rocker length adjustment assembly 9 includes an adjustment slot 34 provided in the main rod group 8. Figure 7 As shown, a clamping plate 43 is installed on both sides of the adjustment slot 34, and a cross plate 35 is connected between the clamping plates 43. A set of bolts 36 are provided between the two clamping plates 43; one end of the movable shaft 31 is set between the bolts 36, and the end of the movable shaft 31 is passed through the cross plate 35. The two bolts clamp the movable shaft, and the end of the movable shaft passes through the cross plate to achieve the connection with the screen. The adjustment slot is a long slide structure, which realizes the infinite adjustment of the movable shaft position. By adjusting the position of the two movable shafts along the main rod group, there are multiple options for the screen inclination angle, thereby obtaining a variety of different screen amplitude effects. The rotating shaft between the upper part of the main rod group and the main frame passes through the main rod group. The upper part of the main rod group is provided with a similar rocker length adjustment assembly. The rotating shaft is between the two bolts of the rocker length adjustment assembly and passes through the cross plate and the through hole on the plate body of the rocker length adjustment assembly. The rocker length adjustment assembly can be adjusted on the main rod group to adjust the relative position between the rotating shaft and the main rod group, thereby adapting to the adjustment of the remaining adjustment structures.
[0023] The working principle of the present invention is as follows: the granular garbage to be processed (taking a mixture of gravel and garbage as an example) is placed in the sandblasting mechanism 3 on the sub-frame 2. Inside the sandblasting mechanism 3, the sandblasting motor 16 at one end of the container box 17 is started, and its extended end drives multiple screw rods 18 to rotate through a gear set. Due to the rotation of the screw rods 18, the gravel in the container box 17 is pushed stably and evenly and flows out through the discharge port; the gravel flowing out of the discharge port of the sandblasting mechanism 3 enters the guide mechanism 4 at one end of the main frame 1, and the guide main plate 24 of the guide mechanism 4 is rotated. The angle can be adjusted; on the top plate 11 with adjustable position at the upper end of the main frame 1, the screening motor 12 is turned on, and the crank adjustment component 13 at the protruding end of the motor starts to work. The crank structure composed of the disk 37 and the swinging member 38 can change the crank length by adjusting the position of the fixing screw 42 between the adjustment hole 41 and the countersunk hole 40; the multiple sockets 39 at one end of the swinging member 38 cooperate with the connecting rod at the upper end of the main rod group 8 to adjust the rocker length; the power is transmitted to the main rod group 8 through the crank adjustment component 13, and the side of the main rod group 8 is adjusted by The adjustable structure is connected to the main frame 1, and its position can be adjusted, thereby driving the screen 10 connected to the end through the rocker length adjustment assembly 9 to vibrate; the movable shafts 31 at both ends of the screen 10 frame are fixed at the adjustment slots 34 in the main rod group 8 by the clamping plates 43, the cross plates 35 and the bolts 36, and the movable shafts 31 can be installed in a plurality of side holes 33 on the side of the screen 10 frame, which further enriches the vibration mode of the screen 10; during the vibration of the screen 10, the gravel that meets the aperture of the screen 10 passes through the screen 10 and falls into the gravel collection box 6 corresponding to the bottom of the main frame 1; while the garbage and some larger particles of gravel that cannot pass through the screen 10 fall into the garbage collection box 7; after the experiment is completed, the performance of the vibrating screen system can be evaluated by measuring and comparing the weight of the gravel screened in the gravel collection box 6 and the weight of the garbage and a small amount of residual gravel in the garbage collection box 7; if the proportion of garbage in the garbage collection box 7 is high and the residual gravel is small, it indicates that the screening ability of the vibrating screen system is good under the current parameter settings of the various mechanisms of the experimental platform.
[0024] The above embodiments merely illustrate the implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. Furthermore, in this embodiment, the terms "up," "down," "left," "right," "front," and "back" merely represent relative positions and do not represent absolute positions. It should be noted that a person skilled in the art can make various modifications and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be subject to the appended claims.
Claims
1. A particle waste vibration screening test bench, comprising a main frame (1) and a sub-frame (2), characterized in that: The sub-frame (2) is provided with a sandblasting mechanism (3), and one end of the main frame (1) is provided with a flow guide mechanism (4), the feed end of the flow guide mechanism (4) corresponding to the sand discharge end of the sandblasting mechanism (3); a vibrating screen mechanism (5) is provided in the main frame (1), and a sand collecting box (6) and a garbage collecting box (7) corresponding to the discharge end of the vibrating screen mechanism (5) are provided at the bottom of the main frame (1); the vibrating screen mechanism (5) includes a main rod group (8) arranged in the main frame (1), and the side of the main rod group (8) is adjustable with respect to the main frame (1). The main rod group (8) is connected to the main frame (1), the end of the main rod group (8) is provided with a rocker length adjustment component (9), the end of the main rod group (8) is provided with a screen (10) through the rocker length adjustment component (9), and the screen (10) receives the material flowing out of the discharge end of the guide mechanism (4); the upper end of the main frame (1) is provided with a position-adjustable top plate (11), the top plate (11) is provided with a screening motor (12), the protruding end of the screening motor (12) is provided with a crank adjustment component (13), and the output end of the crank adjustment component (13) is connected to the main rod group (8) on one side.
2. The particle waste vibration screening test bench according to claim 1 is characterized by: The sandblasting mechanism (3) comprises a sandblasting support seat (14) arranged on the sub-frame (2), a container box (17) is provided on the sandblasting support seat (14), a motor support plate (15) is provided at one end of the container box (17), and a sandblasting motor (16) is provided on one side of the motor support plate (15); the output end of the sandblasting motor (16) is connected to a plurality of screw rods (18) arranged in the container box (17) via a gear set, and the discharge port of the container box (17) corresponds to the diversion mechanism (4).
3. The particle waste vibration screening test bench according to claim 1 is characterized by: One end of the sandblasting support seat (14) has a bayonet (19) for clamping the rod body of the sub-frame (2), and one end of the sandblasting support seat (14) is provided with a plurality of fixing nails (20) near the bayonet (19), and one end of the fixing nails (20) is matched with the profile groove of the sub-frame (2).
4. The particle waste vibration screening test bench according to claim 1, characterized in that: The flow guide mechanism (4) comprises columns (21) arranged on both sides of the main frame (1), a flow guide moving block (22) being provided on the columns (21), a spring block (23) being hingedly connected to one end of the flow guide moving block (22), a flow guide main plate (24) being provided between the spring blocks (23) on both sides, and a reinforcement plate (25) being provided on the flow guide main plate (24).
5. The particle waste vibration screening test bench according to claim 4 is characterized by: The elastic block (23) comprises a main body (26) and an auxiliary member (27) hinged to one end of the diversion moving block (22); one end of the auxiliary member (27) comprises a waist-shaped block (28) which is inserted into a groove of the main body (26); and one end of the main body (26) comprises a slot (29) for clamping the diversion main board (24).
6. The particle waste vibration screening test bench according to claim 1, characterized in that: The screen (10) includes a screen frame (30), and movable shafts (31) are provided at both ends of the screen frame (30), and the movable shafts (31) are connected to the rocker length adjustment assembly (9); a replaceable screen plate (32) is connected to the screen frame (30) via bolts (36), and the bottom of the screen plate (32) is mounted on the movable shaft (31).
7. The particle waste vibration screening test bench according to claim 6, characterized in that: The side of the screen frame (30) has a plurality of side holes (33) for the movable shaft (31) to pass through.
8. The particle waste vibration screening test bench according to claim 6, characterized in that: The rocker length adjustment assembly (9) includes an adjustment slot (34) provided in the main rod group (8), with clamping plates (43) provided on both sides of the adjustment slot (34), a transverse plate (35) connected between the clamping plates (43), and a group of bolt members (36) provided between the two clamping plates (43); one end of the movable shaft (31) is provided between the bolt members (36), and the end of the movable shaft (31) is passed through the transverse plate (35).
9. The particle waste vibration screening test bench according to claim 1, characterized in that: The crank adjustment assembly (13) includes a disc (37) arranged at the output end of the screening motor (12), a swinging member (38) connected to the disc (37), and a plurality of sockets (39) are provided at one end of the swinging member (38), and the sockets (39) cooperate with the connecting rods at the upper end of the main rod group (8).
10. The particle waste vibration screening test bench according to claim 9, characterized in that: The disk (37) has a plurality of rows of countersunk holes (40) on its surface, and one end of the swinging member (38) has a plurality of adjustment holes (41). Fixing screws (42) are provided between the adjustment holes (41) and the countersunk holes (40).
Citation Information
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