Screening machine and using method thereof

Abstract

The invention provides a screening machine and a using method thereof.The screening machine comprises a plurality of screening boxes, a screening platform and a transverse vibration meter, the screening boxes are stacked from top to bottom, and the bottom of the screening box on the lowermost layer is connected to the screening platform; every two adjacent screening boxes are connected through a sealing ring, and the side wall of each screening box is connected with a transverse vibration meter in a one-to-one correspondence mode. And the apertures of the screens in the screening boxes are sequentially reduced from top to bottom. According to the screening machine, the vibration intensity of each layer of screening box is controlled through the transverse vibration meter, so that the screening efficiency and speed are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aggregate screening devices, and relates to a screening machine and a use method thereof, and in particular to a bidirectional vibration and convenient discharging screening machine for fine screening of highway aggregates. Background Art

[0002] The process of bulk aggregate being divided into different particle sizes through one or more layers of screens is called screening. Screening machine is a vibrating screening machine that uses the relative movement between bulk aggregate and screen surface to make some particles pass through the screen holes, and classifies aggregates such as sand, gravel, and crushed stone into different grades according to particle size. The screening process of the screening machine is generally continuous. After the screening raw materials are fed to the screen, the aggregates smaller than the size of the screen holes pass through the screen holes, which are called undersize products; the aggregates larger than the size of the screen holes are continuously discharged from the screen surface, which are called oversize products.

[0003] With the vigorous development of highway construction in my country, the research on road materials has gradually become more refined. A large number of tests require more refined aggregate grading. Therefore, screening machines with multi-layer screen combinations came into being.

[0004] For example, Chinese patent CN212216218U discloses a double-layer bidirectional vibrating powder screening device with a replaceable screen, the powder screening device comprising a shell, a powder screening assembly arranged at the upper inner part of the shell, and a vibration assembly arranged below the powder screening assembly, the vibration assembly comprising a transverse vibration motor and a longitudinal vibration motor; two transverse and longitudinal cylindrical grooves are provided on the inner side wall of the shell, and the transverse vibration motor and the longitudinal vibration motor are both fixed in the cylindrical grooves by a clamp. This technical solution is provided with two layers of screens, and is provided with a transverse vibration motor and a longitudinal vibration motor, but the transverse vibration of the two layers of screens is provided by the same transverse vibration motor. The use of a single transverse vibration motor will lead to energy waste or reduce screening efficiency and accuracy. When the proportion of the aggregate particle size to be screened varies greatly, if a single transverse vibration motor is used, when the transverse vibration motor uses a larger vibration intensity, for the aggregate particle size layer with less screening amount, it will lead to insufficient utilization of energy and a larger displacement of the connection of the screening box, damaging the connection. If the transverse vibration motor uses a smaller power, it will cause problems such as insufficient screening accuracy and slow screening rate for the aggregate particle size layer with more screening amount. Summary of the invention

[0005] In order to solve the above problems of the prior art, the present invention provides a screening machine and a method for using the same. The screening machine controls the vibration intensity of each layer of screening boxes through a lateral vibrator, thereby increasing the screening efficiency and rate.

[0006] The present invention is achieved through the following technical solutions: A screening machine comprises a plurality of screening boxes, a screening platform and a transverse vibrator. The plurality of screening boxes are stacked from top to bottom, and the bottom of the bottom screening box is connected to the screening platform; two adjacent screening boxes are connected via a sealing ring, and a transverse vibrator is connected to the side wall of each screening box in a one-to-one correspondence; from top to bottom, the aperture of the screen in each screening box becomes smaller in sequence.

[0007] Preferably, the screening machine further comprises a base and a longitudinal vibration box, the screening platform is arranged on the base; the longitudinal vibration box is arranged in the base to provide longitudinal vibration force for the screening box.

[0008] Furthermore, a step is provided on the outer edge of the base, and a shock-absorbing spring is provided on the step; a bottom end of the shock-absorbing spring is fixed on the step, and a top end is connected to the bottom surface of the screening platform.

[0009] Furthermore, a discharge port is provided on the side wall of the screening box at a position flush with the screen, and a rotating baffle is provided on the side wall of the screening box, and the rotating baffle can move along the side wall of the screening box to open or close the discharge port.

[0010] Furthermore, a telescopic rod is vertically arranged on the base, and the top of the telescopic rod is in contact with the bottom of the screening platform; the telescopic rod and the discharge port are symmetrical about the axis of the screening box.

[0011] Furthermore, the telescopic rod includes a fixed shell, a first piston, and a second piston; the second piston is slidably arranged in the first piston, and the first piston is slidably arranged in the fixed shell; the fixed shell is fixed on the base, a first medium inlet hole is opened at the bottom of the fixed shell, a first medium inlet hole is opened at the bottom of the first piston, a third medium inlet hole is opened at the upper end of the fixed shell, and the third medium inlet hole is always connected to the gap between the fixed shell and the first piston; a medium circulation channel is opened on the side wall of the first piston, one end of the medium circulation channel extends to the lower end of the first piston and is always connected to the gap between the fixed shell and the first piston, and the other end of the medium circulation channel extends to the upper end of the first piston and is connected to the gap between the first piston and the second piston.

[0012] Furthermore, a rack is provided at one end of the rotating baffle away from the discharge port, a rotating rod is rotatably provided on the side wall of the screening box, gear teeth are provided on the surface of the rotating rod, and the gear teeth are meshed with the rack.

[0013] Furthermore, a cushion block is provided between the bottom of the screening box at the lowest layer and the screening platform.

[0014] Preferably, a fixing rod is provided on the screening platform, a fixing rod retaining ring is provided on the outer surface of the side wall of the screening box, the fixing rod is inserted into the fixing rod retaining ring, and a limiting ring is provided on the upper end of the fixing rod.

[0015] Preferably, the transverse vibrator includes a transverse telescopic rod, a motion converter, a first motor and a transverse vibration operating table; an internal gear is connected to the output shaft of the first motor, the internal gear is internally meshed with the motion converter, the motion converter is hinged to one end of the transverse telescopic rod, and the other end of the transverse telescopic rod is connected to the side wall of the screening box; the first motor is connected to the transverse vibration operating table by signal, and the transverse vibration operating table is used to control the speed of the first motor.

[0016] The method for using the screening machine described in the present invention includes: according to the aggregate particle size distribution, controlling the vibration intensity of the corresponding screening box through each lateral vibrator, adding the aggregate to be screened into the top screening box, screening layer by layer through the screens in each layer of the screening box, and retaining aggregates of different levels of particle size on the screens of the corresponding screening box; wherein, the larger the aggregate particle size, the higher the vibration intensity of the corresponding screening box; the higher the proportion of aggregates of a certain level of particle size, the higher the vibration intensity of the corresponding screening box.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The screening machine of the present invention is provided with a transverse vibrator corresponding to each layer of screening boxes, and the screening boxes are connected to the transverse vibrators one by one. At the same time, two adjacent screening boxes are connected by a flexible sealing ring, and the sealing ring allows a certain misalignment between adjacent screening boxes. Therefore, the vibration intensity of the corresponding screening box can be controlled by the transverse vibrator, so that each screening box adopts a different transverse vibration intensity. When screening aggregates, different vibration intensities can be used for aggregates of different particle sizes. The larger the particle size of the aggregate, the higher the vibration intensity of the corresponding screening box; at the same time, according to the proportion of different particle sizes of the aggregate itself that needs to be screened, the higher the proportion of aggregates of a certain level of particle size, the higher the vibration intensity of the corresponding screening box, thereby increasing the screening efficiency and rate. Furthermore, the present invention is also provided with a base, in which a longitudinal vibration box is arranged, and the longitudinal vibration box provides longitudinal vibration for the screening box, thereby realizing bidirectional vibration and improving the screening effect.

[0018] Furthermore, in the present invention, a shock-absorbing spring is arranged between the screening platform and the base, and the shock-absorbing spring can play a certain shock-absorbing role to prevent the screening platform from excessively squeezing the base during longitudinal vibration.

[0019] Furthermore, a discharge port is provided on the side wall of the screening box of the present invention. When unloading is required, the screening box does not need to be disassembled, and the rotating baffle can be directly opened to discharge the material from the discharge port, thereby realizing convenient unloading. Moreover, when tilting, a lateral vibrator provides slight vibration, which can better control the discharge port so that the screened large and small particles can be quickly discharged from the screening box.

[0020] Furthermore, a telescopic rod is provided on the base of the present invention. When discharging is required, the telescopic rod is extended to tilt the screening box toward the discharging port, thereby realizing discharging and making discharging more convenient.

[0021] Furthermore, a pad is arranged between the bottom of the lowest screening box and the screening platform. The pad has a certain flexibility. When the longitudinal vibration box generates vertical vibration, the pad can appropriately eliminate the adverse effect of the vertical vibration on the lowest screening box. At the same time, it works together with the sealing ring to reduce the overall vertical change of the interconnected screening boxes under vertical vibration.

[0022] Furthermore, a fixing rod is provided on the screening platform, and a fixing rod retaining ring is provided on the outer surface of the side wall of the screening box. The fixing rod is inserted into the fixing rod retaining ring. When the lateral vibration displacement of the screening box is satisfied, the fixing rod is used to limit the screening box to a certain extent, so as to avoid excessive lateral vibration displacement of the screening box. The limiting ring is used to limit the longitudinal displacement of the screening box, so as to avoid excessive longitudinal displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a front view of a screening machine of the present invention; Figure 2 It is a side view of a screening machine of the present invention; Figure 3 It is a stereogram of the screening box of the present invention; Figure 4 is a top view of the screening box of the present invention; Figure 5 It is a schematic diagram of the connection of two adjacent layers of screening boxes of the present invention; Figure 6 It is a schematic diagram of the connection between the rotating rod and the rotating baffle of the present invention; Figure 7 is a schematic diagram of a cushion block of the present invention; Figure 8 It is a structural schematic diagram of the lateral vibration instrument of the present invention; Fig. 9 It is a structural schematic diagram of the telescopic rod of the present invention.

[0025] In the figure, 1. fixed rod, 2. limiting ring, 3. feed port, 4. screening box, 41. discharge port, 42. rotating rod, 43. fixed rod retaining ring, 44. rotating baffle, 45 sealing ring, 5. screening platform, 6. cushion block, 7. transverse vibrator, 71. transverse telescopic rod, 72. motion converter, 73. first motor, 8. telescopic rod, 81. fixed shell, 82. first piston, 83. second piston, 84. first medium inlet, 85. second medium inlet, 86. third medium inlet, 87. medium flow channel, 9. damping spring, 10. longitudinal vibration box, 101. heavy hammer, 102. second motor, 11. dust cover, 12. base, 13. transverse vibration operating table. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0028] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0029] In addition, it should be noted that the terms "first", "second", etc. of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. The orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements.

[0030] like Figure 1 and Figure 2 As shown, a screening machine includes a plurality of screening boxes 4, a screening platform 5, a base 12, a longitudinal vibration box 10, and a transverse vibrator 7. The plurality of screening boxes 4 are stacked from top to bottom, and the bottom of the bottom screening box 4 is connected to the screening platform 5, the screening platform 5 is arranged on the base 12, and the longitudinal vibration box 10 is arranged in the base 12. A transverse vibrator 7 is connected to the side wall of each screening box 4. From top to bottom, the mesh apertures in each screening box 4 become smaller in sequence. Figure 5 As shown, two adjacent screening boxes 4 are connected by a sealing ring 45, and the screening box 4 can be connected to the sealing ring through a clamp ring. The sealing ring is a semi-flexible material with good upper and lower connections, which can meet the needs of small lateral displacement between different layers of screening boxes.

[0031] Each transverse vibrator 7 is used to provide transverse vibration force for the corresponding screening box 4. Since two adjacent screening boxes 4 are connected by a sealing ring 45, and the sealing ring 45 has a certain flexibility, the two adjacent screening boxes 4 have relative mobility. Therefore, the working frequency of each transverse vibrator 7 can be set as needed, thereby providing suitable vibration intensity for different screening boxes 4. When screening aggregates, different vibration intensities can be used for aggregates of different particle sizes, and larger particle aggregates use higher vibration intensity; at the same time, according to the proportion of different particle sizes of the aggregates to be screened, a higher vibration intensity is used for screening the particle size with a larger proportion, thereby increasing the screening efficiency and rate.

[0032] Each screening box 4 is provided with a screen, and a discharge port 41 is provided on the side wall of the screening box 4 at a position flush with the screen. A rotating baffle 44 is provided on the side wall of the screening box 4, and the rotating baffle 44 can move along the side wall of the screening box 4 to open or close the discharge port 41. Figure 3 , Figure 4 shown.

[0033] Specifically, Figure 6 As shown, a rack is provided at one end of the rotating baffle 44 away from the discharge port 41, and a rotating rod 42 is rotatably provided on the side wall of the screening box 4. The surface of the rotating rod 42 is provided with gear teeth, and the gear teeth mesh with the rack. By rotating the rotating rod 42, the rotating baffle 44 can be pushed to move along the side wall of the screening box 4 to open or close the discharge port 41.

[0034] like Figure 1 and 2 As shown, the top of the uppermost screening box 4 is sealed with a dust cover 11, and the dust cover 11 is provided with a feed port 3, and the feed port 3 is connected to the dust cover 11 by a buckle. The aggregate to be screened enters the uppermost screening box 4 from the feed port, and after screening, aggregates of different particle sizes are retained on the corresponding screening box 4.

[0035] The screening platform 5 is provided with a fixing rod 1, and the outer surface of the side wall of the screening box 4 is provided with a fixing rod retaining ring 43, the fixing rod 1 is inserted into the fixing rod retaining ring 43, and a limiting ring 2 is provided at the upper end of the fixing rod 1. The aperture of the fixing rod retaining ring 43 is larger than the diameter of the fixing rod 1. When the lateral vibration displacement of the screening box 4 is satisfied, the screening box 4 is limited to a certain extent to avoid excessive lateral vibration displacement of the screening box 4. The limiting ring 2 is used to limit the longitudinal displacement of the screening box 4 to avoid excessive longitudinal displacement.

[0036] In some specific embodiments of the present invention, a cushion block 6 is provided between the bottom of the screening box 4 at the bottom layer and the screening platform 5, so that the screening box 4 is connected to the screening platform 5 through the cushion block 6. Figure 7 The diagram is a schematic diagram of the pad 6. The pad 6 is a semi-flexible pad with a certain flexibility. When the longitudinal vibration box 10 generates vertical vibration, the pad 6 can appropriately eliminate the adverse effect of the vertical vibration on the bottom screening box 4. At the same time, it works together with the sealing ring 45 to reduce the overall vertical change of the interconnected screening boxes under vertical vibration.

[0037] In some specific embodiments of the present invention, an annular step is provided at the outer edge of the base 12, and four shock-absorbing springs 9 are provided on the step. The bottom end of the shock-absorbing spring 9 is fixed on the step, and the top end is connected to the bottom surface of the screening platform 5, so as to play a certain shock-absorbing role and prevent the screening platform from excessively squeezing the base 12.

[0038] In some specific embodiments of the present invention, a telescopic rod 8 is vertically arranged on the base 12, and the top of the telescopic rod 8 contacts the bottom of the screening platform 5. The telescopic rod 8 and the discharge port 41 are symmetrical about the axis of the screening box 4, so that when the telescopic rod 8 is extended, the screening platform 5 can drive the screening box 4 to tilt toward the discharge port 41, so as to pour out the aggregate on the screen. The arrangement of the discharge port 41 and the telescopic rod 8 can make the discharge more convenient.

[0039] In some specific embodiments of the present invention, Fig. 9 As shown, the telescopic rod 8 includes a fixed shell 81, a first piston 82, and a second piston 83. The second piston 83 is slidably arranged in the first piston 82, the outer wall of the bottom of the second piston 83 is in sealing contact with the inner wall of the first piston 82, and the top of the first piston 82 is provided with an opening for the second piston 83 to extend out. The first piston 82 is slidably arranged in the fixed shell 81, the outer wall of the bottom of the first piston 82 is in sealing contact with the inner wall of the fixed shell 81, and the top of the fixed shell 81 is provided with an opening for the first piston 82 to extend out. The fixed shell 81 is fixed on the base 12, the bottom of the fixed shell 81 is provided with a first medium inlet 84, and the bottom of the first piston 82 is provided with a first medium inlet 85. The flowing medium is introduced from the first medium inlet 84, which can push the second piston 83 and the first piston 82 to move upward, so that the screening box 4 is tilted, and the aggregate on the screen is poured out. The upper end of the fixed shell 81 is provided with a third medium inlet 86, and the third medium inlet 86 is always connected to the gap between the fixed shell 81 and the first piston 82. A medium circulation channel 87 is provided on the side wall of the first piston 82, one end of the medium circulation channel 87 extends to the lower end of the first piston 82 and is always connected to the gap between the fixed shell 81 and the first piston 82, and the other end of the medium circulation channel 87 extends to the upper end of the first piston 82 and is connected to the gap between the first piston 82 and the second piston 83. A flowing medium is introduced into the gap between the fixed shell 81 and the first piston 82 from the third medium inlet hole 86, and the flowing medium enters the gap between the first piston 82 and the second piston 83 along the medium circulation channel 87, pushing the second piston 83 to move downward, and also pushing the first piston 82 to move downward, so that the screening box 4 returns to a horizontal position.

[0040] It should be noted that limiting steps are provided on the first piston 82 and the second piston 83 to ensure that when the first piston 82 rises to the highest position, there is still a gap between the first piston 82 and the fixed shell 81; when the second piston 83 rises to the highest position, there is still a gap between the second piston 83 and the first piston 82, thereby ensuring that the flow medium introduced from the second air inlet causes the first piston 82 and the second piston 83 to descend.

[0041] In some specific embodiments of the present invention, Figure 8As shown, the transverse vibrator 7 includes a transverse telescopic rod 71, a motion converter 72, a first motor 73 and a transverse vibration operating table 13. An internal gear is connected to the output shaft of the first motor 73, and the internal gear is meshed with the motion converter 72. The motion converter 72 is meshed with one end of the transverse telescopic rod 71, and the other end of the transverse telescopic rod 71 is connected to the side wall of the screening box 4. The first motor 73 is connected to the transverse vibration operating table 13 signal, and the speed of the first motor 73 is controlled by the transverse vibration operating table 13. The rotational motion generated by the first motor 73 is converted into the horizontal motion of the transverse telescopic rod 71 by the motion converter 72, and the screening box 4 is subjected to corresponding transverse vibration by the transverse telescopic rod 71. Due to the control of the speed of the first motor 73, different vibration intensities can be generated for each layer of the screening box 4. By selecting different intensities, screening is made more accurate and effective.

[0042] In a specific embodiment of the present invention, the screening box 4 is a cylinder.

[0043] When the present invention is implemented, according to production needs, the required number of screening boxes 4 with the required mesh size are installed in the screening machine, and the aggregate enters the screening machine from the feed port 3. Under the action of vertical vibration and lateral vibration, the aggregate is screened layer by layer, and the aggregate with the smallest particle size falls on the mesh of the bottom screening box 4. The rotating baffle 44 is opened or closed by the rotating rod 42 to open or close the discharge port 3, and the aggregate is discharged from the discharge port 3 by extending the telescopic rod 8.

[0044] The screening machine of the present invention occupies a small area, does not need to disassemble the screen each time, and through the combination of lateral and vertical vibrations and the control of the size of the lateral vibration, the screening is more thorough, clean and efficient.

[0045] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. The above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A screening machine, characterized in that: The invention comprises a plurality of screening boxes (4), a screening platform (5) and a transverse vibrator (7), wherein the plurality of screening boxes (4) are stacked from top to bottom, and the bottom of the screening box (4) at the bottom is connected to the screening platform (5); two adjacent screening boxes (4) are connected via a sealing ring (45), and a transverse vibrator (7) is connected to the side wall of each screening box (4) in a one-to-one correspondence; and the apertures of the screens in each screening box (4) decrease in sequence from top to bottom.

2. The screening machine according to claim 1, characterized in that: It also comprises a base (12) and a longitudinal vibration box (10), wherein the screening platform (5) is arranged on the base (12); the longitudinal vibration box (10) is arranged in the base (12) and is used to provide longitudinal vibration force for the screening box (4).

3. The screening machine according to claim 2, characterized in that: The outer edge of the base (12) is provided with a step, and a shock absorbing spring (9) is provided on the step; the bottom end of the shock absorbing spring (9) is fixed on the step, and the top end is connected to the bottom surface of the screening platform (5).

4. The screening machine according to claim 2, characterized in that: A discharge port (41) is provided on the side wall of the screening box (4) at a position flush with the screen, and a rotating baffle (44) is provided on the side wall of the screening box (4). The rotating baffle (44) can move along the side wall of the screening box (4) to open or close the discharge port (41).

5. The screening machine according to claim 4, characterized in that: A telescopic rod (8) is vertically arranged on the base (12), and the top of the telescopic rod (8) contacts the bottom of the screening platform (5); the telescopic rod (8) and the discharge port (41) are symmetrical about the axis of the screening box (4).

6. The screening machine according to claim 4, characterized in that: A rack is provided at one end of the rotating baffle (44) away from the discharge port (41), and a rotating rod (42) is rotatably provided on the side wall of the screening box (4), and gear teeth are provided on the surface of the rotating rod (42), and the gear teeth mesh with the rack.

7. The screening machine according to claim 2, characterized in that: A cushion block (6) is provided between the bottom of the screening box (4) at the lowest layer and the screening platform (5).

8. The screening machine according to claim 1, characterized in that: A fixing rod (1) is provided on the screening platform (5), a fixing rod retaining ring (43) is provided on the outer surface of the side wall of the screening box (4), the fixing rod (1) is inserted into the fixing rod retaining ring (43), and a limiting ring (2) is provided on the upper end of the fixing rod (1).

9. The screening machine according to claim 1, characterized in that: The transverse vibrator (7) comprises a transverse telescopic rod (71), a motion converter (72), a first motor (73) and a transverse vibration operating table (13); an internal gear is connected to the output shaft of the first motor (73), the internal gear is internally meshed with the motion converter (72), the motion converter (72) is hinged to one end of the transverse telescopic rod (71), and the other end of the transverse telescopic rod (71) is connected to the side wall of the screening box (4); the first motor (73) is signal-connected to the transverse vibration operating table (13), and the transverse vibration operating table (13) is used to control the rotation speed of the first motor (73).

10. The method for using the screening machine according to any one of claims 1 to 9, characterized in that: include: According to the aggregate particle size distribution, the vibration intensity of the corresponding screening box is controlled by each lateral vibrator (7), and the aggregate to be screened is added to the top screening box, and is screened layer by layer through the screens in the screening boxes (4) of each layer.

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