Split platform screening apparatus for screening bulk materials

Abstract

A split platform screening apparatus (1) for screening bulk material includes a primary subframe (2) mountable on a main frame, a primary screen box (3) including a plurality of screening platforms having a loading end (4A) to receive a supply of bulk material and an opposite discharge end (5A) to discharge unscreened material, a secondary screen box (6) mounted to the primary subframe (2) including a plurality of screening platforms having a loading end (4B) adjacent the discharge end of the primary screen box and an opposite discharge end to discharge unscreened material, and a primary screen box subframe (7) coupled to the primary subframe having a discharge end and a loading end. A subframe carriage (10) is provided to couple the primary screen box subframe (7) to the primary subframe (2) and is attached at each side of the discharge end of the primary screen box subframe and is actuatable to move the primary screen box (3) from an operative position in which the discharge end (5A) of the primary screen box (3) is disposed adjacent the loading end (4B) of the secondary screen box (6) to an inoperative position in which the primary screen box (3) is spaced above and away from the secondary screen box (6) to provide access to one or more lower screening platforms (25) in the secondary screen box.

Description

Technical Field

[0001] This invention relates to a split-platform screening device for screening dispersed materials. A screening equipment assembly in static or mobile form, comprising a split platform, is also described. Background Technology

[0002] Various types of screening devices for bulk materials have been developed for screening or sorting bulk materials such as quarry stone, site cleanup materials, and household and industrial waste. They typically include a screening platform with apertures of a defined mesh size, a vibrating platform for screening materials fed onto the platform, and a conveyor arrangement to collect screened material that has passed through the platform and unscreened material that has not. Typically, the device will include one or more screening platforms arranged in a stacked arrangement, each with a different mesh size, and a conveyor arrangement for collecting material from each platform to deliver the screened material to different stockpiles. Typically, the screening platform is mounted in a screen box configured to vibrate to aid in screening the material and move it along the platform from the loading end to the discharge end. The platform can be tilted downwards from the loading end to the discharge end to change the residence time of the bulk material on the platform. For example, loose and easily separable bulk materials require a shorter residence time on the platform, thus allowing the platform to tilt to increase the speed at which the material moves along the platform, while wet materials require a longer residence time on the platform and can therefore be screened on a horizontal or near-horizontal platform.

[0003] In some apparatuses, the screening platform is modular and provided as a primary screen box containing one or more platforms and a secondary screen box containing one or more platforms, wherein the discharge end of the primary screen box is adjacent to the loading end of the secondary screen box, thereby allowing the discharge end of the platform in the primary screen box to transport material to the loading end of the corresponding platform in the secondary screen box. The modularity of the platform allows for variations in the screening angle along the platform and also allows the individual screen boxes to operate at higher speeds and amplitudes, which equates to better performance.

[0004] Figure 1(Prior art) illustrates a known split-platform screening device (A) having two platforms for screening bulk materials, and comprising: a main sub-frame (B) mountable on a main frame (not shown); a primary screen box (C) comprising a plurality of vertically stacked screening platforms (not shown), having a loading end (D1) for receiving a supply of bulk material and an opposing discharge end (E1) for discharging unscreened material; a secondary screen box (F) mounted to the main sub-frame, comprising a plurality of screening platforms (not shown), and having a loading end (D2) adjacent to the discharge end (E1) of the primary screen box and an opposing discharge end (E2) for discharging unscreened material; a primary screen box frame (F) coupled to the main sub-frame, having a discharge end (G) and a loading end (H); and a tilting mechanism (I) for tilting the primary screen box frame downward toward the secondary screen box relative to the main sub-frame. One problem with this type of split-platform multi-platform device is that the primary and secondary screen boxes are mounted to the main frame in a fixed position. Therefore, if one of the platforms in the lower section of the secondary screening box requires maintenance (common for screening platforms used for screening bulk materials in quarries), the upper platform must be removed to obtain access to the lower platform—a difficult and time-consuming operation. This problem is further complicated by the fact that screening equipment is often located in remote locations and maintenance must be performed on-site, involving bringing specialized lifting equipment to the machine itself rather than taking the machine to a repair location.

[0005] The purpose of this invention is to overcome at least one of the aforementioned problems. Summary of the Invention

[0006] This objective is achieved by providing a split-platform screening device according to the preamble of claim 1, wherein the device includes a sub-frame carriage to which a primary box frame is attached, and wherein the sub-frame carriage is mounted to a main sub-frame and actuated to move the primary box frame upward and away from the secondary screen box. This causes the primary screen box (and associated sub-frame) to move from an operating position (e.g., Figure 2 or Figure 4 As shown (inclined), the secondary box is moved to a non-operating position, which is horizontally and vertically spaced from the secondary box. Figure 6 and Figure 7 As shown. This upward and awayward movement of the primary screen box from the secondary screen box allows access to the front end of the secondary screen box, thereby enabling maintenance, including the removal of one or more lower platforms within the secondary screen box, such as... Figure 13 As shown.

[0007] In a first aspect, the present invention provides a split-platform screening device for screening dispersed materials, comprising:

[0008] The subframe, which can be mounted on the main frame;

[0009] A primary screening box includes multiple screening platforms and has a loading end for receiving a supply of bulk material and a corresponding discharge end for discharging unscreened material.

[0010] The secondary screen box, which is mounted to the main frame, includes multiple screening platforms and has a loading end adjacent to the discharge end of the primary screen box and a corresponding discharge end for discharging unscreened material.

[0011] The primary screening box frame, which is connected to the main frame, has a discharge end and a loading end, and

[0012] Optionally, a tilting mechanism is provided to tilt the primary screen box frame downwards toward the secondary screen box relative to the main frame.

[0013] The split-platform screening device is characterized by comprising:

[0014] A subframe carriage, used to connect the primary screen box frame to the main subframe (typically attached to each side of the discharge end of the primary screen box frame), and actuable to move the primary screen box from an operating position to a non-operating position, in which the discharge end of the primary screen box is positioned near the receiving end of the secondary screen box, and in the non-operating position, the primary and secondary screen boxes are spaced laterally and vertically apart, thereby providing access to one or more lower screening platforms within the secondary screen box; and

[0015] The first actuator is used to actuate the subframe carriage.

[0016] The device of the present invention allows for effective separation of the primary screen box and the secondary screen box to allow access to the rear end of the secondary screen box (and the lower platform contained within the box).

[0017] In any embodiment, the subframe carriage is slidably mounted to the main subframe for movement from an operating position to a non-operating position (typically a tilting movement).

[0018] In any embodiment, the first actuator is coupled between the main subframe and each subframe carriage and is operable to move the subframe carriage between an operating position and a non-operating position.

[0019] The use of a sliding subframe carriage allows for controlled movement of the subframe carriage, which is guided by the sliding relationship between the subframe carriage and the main subframe and driven by the actuator.

[0020] In other embodiments, the subframe carriage may be pivotally or hingedly mounted to the main subframe, or connected to the main subframe via a linkage.

[0021] In any embodiment, each subframe carriage is pivotally attached to the primary screening box frame, and the device typically includes a second actuator coupled between each subframe carriage and the primary screening box frame, and operable to tilt the primary screening box frame relative to the subframe carriage.

[0022] In any embodiment, each of the primary and secondary screening boxes includes at least two screening platforms.

[0023] In any embodiment, each of the primary and secondary screening boxes includes at least three or four screening platforms.

[0024] In any embodiment, each subframe carriage includes a support leg and an upper section disposed on top of the support leg, wherein the main subframe includes a guide section (typically disposed on each side of the discharge end of the main subframe) configured to slidably receive each support leg and guide sliding movement of the subframe carriage between operating and non-operating positions.

[0025] In any embodiment, the support leg has a rectangular outline.

[0026] In any embodiment, the guide section of the main subframe has a rectangular profile configured to receive the support legs.

[0027] In any embodiment, the guide section is sized to receive the support leg in a close but sliding relationship.

[0028] In any embodiment, each guide segment of the main subframe defines a linear sliding path for the subframe carriage, the linear sliding path being at an angle of approximately 30° to approximately 60° relative to the longitudinal axis of the main subframe. set up.

[0029] In any embodiment, each guide segment of the main subframe defines a linear sliding path for the subframe carriage, the linear sliding path being at an angle of approximately 35° to approximately 55° relative to the longitudinal axis of the main subframe. set up.

[0030] In any embodiment, each guide segment of the main subframe defines a linear sliding path for the subframe carriage, the linear sliding path being at an angle of approximately 40° to approximately 50° relative to the longitudinal axis of the main subframe. set up.

[0031] In any embodiment, the upper section of each subframe carriage has a front section and a rear section, the front section being disposed above the support leg, wherein the front section is pivotally attached to the discharge end of the primary screen box frame, and the rear section is attached to an end of each of the first and second actuators.

[0032] In any embodiment, the upper section of each subframe carriage includes two spaced-apart, upwardly suspended plates, and the discharge end of the primary screen box frame is pivotally mounted to the upper section between the plates.

[0033] In any embodiment, the main frame includes a guide device for the primary screening box frame, the guide device being disposed on each side of the primary screening box.

[0034] In any embodiment, the guiding device includes two spaced-apart plates configured to receive and guide a portion of the primary screening box frame during movement between an operating position and a non-operating position.

[0035] In any embodiment, the guiding device includes a support device for supporting the primary box frame in at least one position.

[0036] In any embodiment, the spaced-out plates include a series of holes for receiving locking pins to lock the primary sieve box frame in one of a plurality of locations above the main frame.

[0037] In any embodiment, when the primary screen box is in the non-operating position, the secondary screen box can be adjusted to move toward the primary screen box.

[0038] In any embodiment, the secondary screen box includes an adjustable-length torque element configured to be mounted between the secondary screen box and the main frame and actuated to move the secondary screen box toward the primary screen box.

[0039] In any embodiment, the device includes at least two adjustable-length torque elements configured for mounting to opposite sidewalls of a secondary screen box.

[0040] In any embodiment, the first actuation mechanism and the second actuation mechanism are each independently a hydraulic pressure head, a pneumatic pressure head, or an electric actuator.

[0041] On the other hand, a screening equipment assembly is provided, including a main frame and a split-platform screening device according to the invention mounted to the main frame.

[0042] Screening equipment components can be static screening equipment components or mobile screening equipment components.

[0043] In any embodiment, the screening device or screening equipment assembly includes a separate discharge conveyor arranged to discharge screened material of different size ranges into separate stockpiles.

[0044] In another aspect, the present invention provides a method for maintaining a split-platform screening device, comprising the following steps:

[0045] Actuating the first actuator moves the subframe carriage to a non-operating position, in which the primary screen box is above and spaced away from the secondary screen box, thereby providing passage to one or more lower screening platforms in the secondary screen box; and

[0046] Approach the rear of the secondary screen box or the front of the primary screen box to perform maintenance.

[0047] In any embodiment, the maintenance steps include removing one or more of the lower screening platforms of the secondary screen box without having to remove the upper screening platform of the secondary screen box.

[0048] In any embodiment, the split-platform screening device is a mobile or static split-screen screening device.

[0049] In any embodiment, maintenance is performed on-site, such as at a quarry.

[0050] Other aspects and preferred embodiments of the invention are defined and described in the other claims set forth below. Attached Figure Description

[0051] Figure 1 (Prior art) shows a split-platform screening device for screening dispersed materials, which has two platforms and includes a tilting mechanism for a primary screen box.

[0052] Figure 2 This is a side perspective view showing the split-platform screening device according to the invention in the operating position.

[0053] Figure 3 In the operating position Figure 2 Side view of the split-platform screening device.

[0054] Figure 4 From Figure 1 A side perspective view of the split-platform screening device, showing the primary screen box and primary screen box frame in the operating tilt position.

[0055] Figure 5 Is in Figure 4 The side view of the split-platform screening device in the tilted operating position is shown.

[0056] Figure 6 From the non-operating position Figure 1 A side perspective view of the split-platform screening device shows the primary screen box and its frame separated from the secondary screen box in the transverse and vertical directions.

[0057] Figure 7 yes Figure 6 The image shows a side view of the split-platform screening device in its non-operational raised position.

[0058] Figure 8 This is a side view of the subframe carriage that forms part of the split platform screening device of the present invention.

[0059] Figure 9A This is a side view of the subframe carriage in the figure, where the first actuating head and the second actuating head are attached and the first actuating head is retracted (operating position).

[0060] Figure 9B yes Figure 9A A side view of the subframe carriage shows the first actuating pressure head extended (non-operating position).

[0061] Figure 10 This is a perspective view of the primary screen box frame attached to the sub-frame carriage on each side, and shows the first actuating head attached to the sub-frame carriage in the retracted (operated) position. The second actuating head (hidden) is in the retracted position, meaning that the primary screen box frame is not tilted upward relative to the sub-frame carriage.

[0062] Figure 11 It is similar to Figure 10 The perspective view shows the second actuating head (hidden) being actuated to tilt the primary screen box frame upward relative to the subframe carriage.

[0063] Figure 12 It is similar to Figure 11 A perspective view, but in which the first actuating pressure head has been actuated to move the primary screen box frame upward and away from the secondary screen box (not shown) while maintaining the tilt angle of the primary screen box frame.

[0064] Figure 13 It is a side elevation view (from) Figure 7 (The opposite side of the device shown) illustrates the primary screen box in a non-operating position and the removal of the lower screening platform from the secondary screen box for maintenance. Detailed Implementation

[0065] All publications, patents, patent applications and other references mentioned herein are incorporated herein by reference in their entirety for all purposes, just as each individual publication, patent or patent application is specifically and individually indicated by reference and its contents are fully described herein.

[0066] As used herein, and unless otherwise specifically indicated, the following terms are intended to have the following meanings, except for any broader (or narrower) meaning that may be enjoyed in the art:

[0067] Unless the context otherwise requires, the singular as used herein shall be understood to include the plural, and vice versa. The term “a” or “an” as used in relation to an entity shall be understood to refer to one or more of that entity. Therefore, the terms “a” (or “an”), “one or more”, and “at least one” are used interchangeably herein.

[0068] As used herein, the term “comprising” or variations thereof (e.g., “comprising” or “including”) should be understood to indicate the inclusion of any stated whole (e.g., feature, element, characteristic, property, method / process step, or limitation) or group of wholes (e.g., feature, element, characteristic, property, method / process step, or limitation), but does not exclude any other wholes or groups of wholes. Therefore, as used herein, the term “comprising” is inclusive or open-ended and does not exclude additional, unlisted wholes or methods / process steps.

[0069] As used herein, the phrase "the primary screen box and the secondary screen box are spaced apart laterally and vertically" means that the primary screen box moves from the operating position upwards and away from the secondary screen box to a non-operating position that allows access to the front of the secondary screen box. Typically, the secondary screen box does not move in the Z-plane. This results in the primary screen box (and associated subframe) moving from the operating position (e.g., ...) Figure 2 or Figure 4 The screen box (inclined as shown) is moved to a non-operating position, which is horizontally and vertically separated from the secondary screen box, as shown. Figure 6 and Figure 7 As shown.

[0070] example

[0071] The invention will now be described with reference to specific examples. These are merely exemplary and for illustrative purposes only: they are not intended to limit the scope of the claimed patent rights or the described invention in any way. These examples constitute the best mode of practice currently considered for carrying out the invention.

[0072] Refer to the attached diagram, and first refer to... Figure 1(Prior art) A known split-platform screening device (A) for screening bulk materials is shown. The device includes: a main sub-frame (B) that can be mounted on a main frame (not shown); a primary screen box (C) including a plurality of vertically stacked screening platforms (not shown), the primary screen box (C) having a loading end (D1) for receiving a supply of bulk material and an opposing discharge end (E1) for discharging unscreened material; a secondary screen box (F) mounted to the main sub-frame, the secondary screen box (F) including a plurality of screening platforms (not shown), having a loading end (D2) adjacent to the discharge end (E1) of the primary screen box and an opposing discharge end (E2) for discharging unscreened material; a primary screen box frame (G) connected to the main sub-frame, the primary screen box frame (G) having a discharge end (H) and a loading end (I); and a tilting mechanism (J) for tilting the primary screen box frame downward toward the secondary screen box relative to the main sub-frame.

[0073] refer to Figures 2 to 7 The present invention illustrates a split-platform screening device, and in... Figure 8 The image shows the maintenance of the screening device.

[0074] refer to Figures 2 to 7 The split-type screening device (1) of the present invention includes: a main sub-frame (2) that can be mounted on a main frame (not shown); a primary screening box (3) including a plurality of screening platforms (not shown), the primary screening box (3) having a loading end (4A) for receiving a supply of bulk material and an opposing discharge end (5A) for discharging unscreened material; and a secondary screening box (6) mounted to the main sub-frame (2), the secondary screening box (6) including a plurality of screening platforms (not shown), having a loading end (4B) adjacent to the discharge end (5A) of the primary screening box and an opposing discharge end (not shown) for discharging unscreened material. The primary screening box (3) is mounted on a primary screening box frame (7), the primary screening box frame (7) having longitudinal side beams (8) connected by end beams (9).

[0075] The primary and secondary screen boxes are substantially the same as those in the prior art and include vertically stacked screening platforms (usually three or four) and support columns for the screening platforms, as well as a vibration mechanism for vibrating the screening platforms to screen the material and push the material along the platform from the loading end to the discharge end.

[0076] In the split-platform screening device of the present invention, the primary screening box frame (7) is not directly attached to the main sub-frame (2), but is connected to the main sub-frame (2) via two sub-frame carriages (10) provided on each side of the device. Each sub-frame carriage (10) is pivotally attached to the primary screening box frame (7) via a pivot joint (11) at the discharge end of the sub-frame (7), and is slidably mounted to the main sub-frame (2) for moving from an operating position to a non-operating position, in which the discharge end (5A) of the primary screening box (3) is located near the receiving end of the secondary screening box (see See Figures 2-5 In this non-operating position, the primary screen box (3) is positioned above and away from the secondary screen box (6), thereby providing access to one or more lower screening platforms within the secondary screen box (see [reference]). Figure 6 and Figure 7 ).

[0077] The main frame (2) includes a guide device for the primary screening box frame, which is disposed on each side of the primary screening box (3). The guide device includes two spaced-apart triangular plates (12A, 12B) configured to receive and guide a portion of the primary screening box frame during movement between an operating position and a non-operating position. The plates (12) include a series of corresponding holes (13) configured to receive mounting pins to support the primary screening box frame in a raised position.

[0078] For details, please refer to the following: Figure 8 The subframe carriage (10) is provided by an elongating element that bends at the middle of its end to provide a support leg (14) with a rectangular profile and an upper section (15), which in this embodiment is arranged at an angle of approximately 135° to the support leg (14). The upper section (15) includes a rear end (18) defined by two spaced-apart plates (16A, 16B), which in use receives the longitudinal side beams of the primary box frame (in Figure 12 The upper section (15) is shown as 8) at its end, and has a front end (17) that is pivotally attached to the end of the longitudinal side beam (8) during use. (See reference...) Figure 6Each side of the main frame includes a guide sleeve (19) with a rectangular profile, which is configured to receive the support leg (14) in a tight but sliding relationship. The guide sleeve (19) is defined by a front wall (19A) and a side wall (19B) and is set at an angle of approximately 45° relative to the longitudinal axis of the main frame (2). It will be understood that different angles, such as 20°–60°, can be used depending on the type of primary screening box and the number of platforms; however, for three or four screening platforms, an angle of approximately 40–50° has been found to be ideal.

[0079] Refer to Figure 9 to Figure 12 A first actuating device in the form of a hydraulic pressure head (20) is installed between the rear end (18) of the upper section of the main subframe (2) and each subframe carriage (10), and is used to move the subframe carriage (and the primary screen box frame / primary screen box) from... Figures 2 to 5 The indicated operation position is moved to Figure 6 and Figure 7 The non-operational position is shown. Figure 9A and Figure 9B The movement of the subframe carriage relative to the main subframe (not shown) when the actuating head (20) is actuated is clearly shown. A second actuating device in the form of a hydraulic head (22) is mounted between the primary screen box frame (7) and the rear end (18) of the upper section of each subframe carriage (10) and is operable to tilt the primary screening platform. This second actuating device is also provided and connected between each subframe carriage and the primary screen box frame and is operable to tilt the primary screen box frame relative to the subframe carriage.

[0080] Figures 10 to 12 The sub-frame carriages (10) attached to each side of the primary sieve box frame (7) are shown, along with a first actuating head (20) and a second actuating head (concealed) attached to the carriages (10). Figure 11 In the middle, the second actuating pressure head (22) has been actuated to tilt the primary screen box frame (7) upward relative to the sub-frame carriage (10). Figure 12 In the middle, the first actuating head (20) has been actuated to move the carriage (10) upward and away from the main frame, while maintaining the angle of the primary screen box frame (7) relative to the main frame.

[0081] Figure 13 The sieving apparatus of the present invention in a non-operating position is shown, wherein the primary sieve box (3) is separated from the secondary sieve box (6) (moved upward and away), and the lower sieving platform (25) removed from the front end of the secondary sieve box is shown.

[0082] Equivalent example

[0083] The foregoing description details the presently preferred embodiments of the invention. Upon consideration of this description, many modifications and variations in practice will arise for those skilled in the art. These modifications and variations are intended to be covered by the appended claims.

Claims

1. A split-platform screening device (1) for screening dispersed materials, comprising: The main subframe (2) can be installed on the main frame; The primary screening box (3) includes multiple screening platforms (25) and has a loading end (4A) for receiving a supply of bulk materials and a corresponding discharge end (5A) for discharging unscreened materials. Secondary screen box (6), which is mounted to the main frame (2), includes multiple screening platforms (25) and has a loading end (4B) adjacent to the discharge end (5A) of the primary screen box and a opposite discharge end for discharging unscreened material. and A primary screen box frame (7) is connected to the main sub-frame (2) and has a discharge end and a loading end. The split-platform screening device is characterized by comprising: A subframe carriage (10) for connecting the primary screen box frame (7) to the main subframe (2), the subframe carriage (10) being attached to each side of the discharge end of the primary screen box frame and actuable to move the primary screen box (3) from an operating position to a non-operating position, in which the discharge end (5A) of the primary screen box (3) is located near the loading end (4B) of the secondary screen box (6), and in the non-operating position, the primary screen box (3) is spaced above and away from the secondary screen box (6), thereby providing access to one or more lower screening platforms (25) in the secondary screen box; and A first actuator (20) is used to actuate the subframe carriages (10), wherein each subframe carriage (10) includes a support leg (14) and an upper section (15) disposed on top of the support leg, wherein the main subframe (2) includes a guide section configured to slidably receive each support leg and guide the sliding movement of the subframe carriage between the operating position and the non-operating position, wherein each guide section of the main subframe defines a linear sliding path for the subframe carriage, the linear sliding path being set at an angle Ø of 30° to 60° relative to the longitudinal axis of the main subframe.

2. The split-platform screening device (1) according to claim 1, wherein, The subframe carriage (10) is slidably mounted to the main subframe (2) for tilting movement from the operating position to the non-operating position, wherein the first actuator (20) is coupled between the main subframe (2) and each subframe carriage (10) and is operable to move the subframe carriage (10) between the operating position and the non-operating position.

3. The split-platform screening device (1) according to claim 1 or 2, wherein, Each subframe carriage (10) is pivotally attached to the primary sieve box frame (7), wherein the device includes a second actuator (22) coupled between each subframe carriage (10) and the primary sieve box frame (7) and operable to tilt the primary sieve box frame (7) relative to the subframe carriage (10).

4. The split-platform screening device (1) according to any one of claims 1-2, wherein, The primary screening box (3) and the secondary screening box (6) include at least two screening platforms (25).

5. The split-platform screening device (1) according to claim 1 or 2, wherein, Each subframe carriage has an upper section (15) having a front section (17) and a rear section (18), the front section (17) being disposed above the support leg (14), wherein the front section is pivotally attached to the discharge end of the primary screen box frame (7), and the rear section is attached to the end of the first actuator (20).

6. The split-platform screening device (1) according to any one of claims 1 to 2, wherein, The upper section (15) of each subframe carriage (10) includes two spaced-apart upwardly suspended plates (16A, 16B), and the discharge end of the primary screen box frame (7) is pivotally mounted to the upper section between the plates.

7. The split-platform screening device (1) according to any one of claims 1-2, wherein, The main frame (2) includes a guide device for the primary screening box frame (7), the guide device being disposed on each side of the primary screening box, the guide device including two spaced-apart plates (12A, 12B) configured to receive and guide a portion of the primary screening box frame during movement between the operating position and the non-operating position.

8. The split-platform screening device (1) according to claim 7, wherein, The spaced-apart plates (12A, 12B) include a series of holes (13) for receiving locking pins to lock the primary sieve box frame (7) in one of a plurality of locations above the main sub-frame (2).

9. The split-platform screening device (1) according to any one of claims 1-2, comprising an adjustment device for adjusting the secondary screen box toward the primary screen box when the primary screen box is in the non-operating position.

10. The split-platform screening device (1) according to claim 3, wherein, The first actuator (20) and the second actuator (22) are each independently a hydraulic pressure head, a pneumatic pressure head, or an electric actuator.

11. A static or mobile screening equipment assembly, comprising a main frame and a split platform screening device (1) according to any one of claims 1 to 10 mounted on the main frame.

12. A method for maintaining a split-platform screening device according to any one of claims 1 to 10, comprising the following steps: The first actuator is actuated to move the subframe carriage to the non-operating position, in which the primary screen box is positioned above and spaced away from the secondary screen box, thereby providing access to one or more lower screening platforms in the secondary screen box. and Approach the rear of the secondary screen box or the front of the primary screen box to perform maintenance.

13. The method according to claim 12, wherein, The maintenance includes removing one or more of the lower screening platforms of the secondary screen box.

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