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CN-117320820-B - Split platform type screening device for screening bulk materials

CN117320820BCN 117320820 BCN117320820 BCN 117320820BCN-117320820-B

Abstract

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

Inventors

  • Stephen Betty
  • STEPHEN KELLY

Assignees

  • 山特维克有限公司

Dates

Publication Date
20260508
Application Date
20220510
Priority Date
20210527

Claims (13)

  1. 1. A split platform screening device (1) for screening bulk material, comprising: a main subframe (2), the main subframe (2) being mountable on the main frame; -a primary screen box (3), the primary screen box (3) comprising a plurality of screening decks (25) and 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), the secondary screen box (6) being mounted to the main subframe (2), comprising a plurality of screening decks (25) and having a loading end (4B) adjacent to the discharge end (5A) of the primary screen box and an opposite discharge end for discharging unscreened material, and A primary screen box frame (7), the primary screen box frame (7) being coupled to the main subframe (2) and having a discharge end and a loading end, The split platform type screening device is characterized by comprising: A subframe carriage (10), the subframe carriage (10) for coupling the primary screen box frame (7) to the main subframe (2), the subframe carriage (10) being attached at each side of the discharge end of the primary screen box frame and being 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 near a loading end (4B) of the secondary screen box (6) to a non-operative position in which the primary screen box (3) is spaced above the secondary screen box (6) and away from the secondary screen box (6) providing access to one or more lower screening platforms (25) in the secondary screen box, and -A first actuator (20) for actuating the subframe carriages (10), wherein each subframe carriage (10) comprises a support leg (14) and an upper section (15) arranged on top of the support leg, wherein the main subframe (2) comprises a guide section configured to slidingly receive each support leg and guide a 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, which is arranged at an angle of 30 ° to 60 ° with respect to a longitudinal axis of the main subframe.
  2. 2. A split platform screening apparatus (1) according to claim 1, wherein the subframe carriages (10) are 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. 3. A split platform screening device (1) according to claim 1 or 2, wherein each subframe carriage (10) is pivotably attached to the primary screen box frame (7), wherein the device comprises a second actuator (22), which second actuator (22) is coupled between each subframe carriage (10) and the primary screen box frame (7) and is operable to tilt the primary screen box frame (7) relative to the subframe carriage (10).
  4. 4. Split platform screening device (1) according to any one of claims 1-2, wherein the primary screen box (3) and the secondary screen box (6) comprise at least two screening decks (25).
  5. 5. Split platform screening device (1) according to claim 1 or 2, wherein the upper section (15) of each subframe carriage has a front section (17) and a rear section (18), the front section (17) being arranged above the support legs (14), wherein the front section is pivotably attached to the discharge end of the primary screen box frame (7) and the rear section is attached to an end of the first actuator (20).
  6. 6. A split platform screening device (1) according to any one of claims 1-2, wherein the upper section (15) of each subframe carriage (10) comprises two spaced apart upwardly depending plates (16 a,16 b), and wherein the discharge end of the primary screen box frame (7) is pivotally mounted to the upper section between the plates.
  7. 7. A split platform screening device (1) according to any one of the preceding claims 1-2, wherein the main subframe (2) comprises guiding means for the primary screen box frame (7), the guiding means being provided on each side of the primary screen box, the guiding means comprising two spaced apart plates (12 a,12 b), the two spaced apart plates (12 a,12 b) being configured to receive and guide a portion of the primary screen box subframe during movement between the operative and non-operative positions.
  8. 8. A split platform screening apparatus (1) according to claim 7, wherein the spaced apart plates (12 a,12 b) comprise a series of holes (13) for receiving locking pins to lock the primary screening box frame (7) in one of a plurality of positions above the main subframe (2).
  9. 9. A split platform screening device (1) according to any one of claims 1-2, comprising adjustment means for adjusting the secondary screen box towards the primary screen box when the primary screen box is in the non-operating position.
  10. 10. A split platform screening device (1) according to claim 3, wherein the first actuator (20) and the second actuator (22) are each independently hydraulic ram or pneumatic ram or electric actuator.
  11. 11. A static or mobile screening arrangement assembly comprising a main frame and a split platform screening arrangement (1) according to any one of claims 1 to 10 mounted to the main frame.
  12. 12. A method of maintaining a split platform screening device according to any one of claims 1 to 10, comprising the steps of: Actuating the first actuator to move the subframe carriage to the non-operative position in which the primary screen box is spaced above and away from the secondary screen box to provide access to one or more lower screening platforms in the secondary screen box, and Access to the rear of the secondary screen box or the front of the primary screen box to perform maintenance.
  13. 13. The method of claim 12, wherein the maintaining comprises removing one or more of the lower screening decks of the secondary screen box.

Description

Split platform type screening device for screening bulk materials Technical Field The invention relates to a split platform type screening device for screening bulk materials. A static or mobile form of a screening apparatus assembly is also described that includes a split deck. Background Various types of screening devices for bulk materials have been developed for screening or sorting bulk materials, such as quarry stones, site cleaning materials, household and industrial waste. They typically include a screening deck having apertures defining mesh sizes and vibratory equipment vibrating the deck to screen material delivered to the deck, and a conveyor arrangement to collect screened material that has passed through the deck and unscreened material that has not passed through the deck. Typically, the apparatus will include more than one screening deck arranged in a stacked arrangement, each deck having a different mesh size, and a conveyor arrangement that collects material from the respective deck delivers screened material to a different stockpile. Typically, the screening decks are mounted in a screen box that is configured to vibrate to aid in screening of the material and to move the material along the decks from the loading end to the discharge end. The platform may be inclined downwardly from the loading end to the discharge end to vary the residence time of the bulk material on the platform. For example, loose and easily separated bulk material needs to stay on the platform for a short time, allowing the platform to tilt to increase the speed at which the material moves along the platform, while wet material needs to stay on the platform for a longer time, and thus can be screened on a horizontal or near-horizontal platform. In some arrangements, the screening decks are separate and provided as a primary screen box containing one or more decks and a secondary screen box containing one or more decks, 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 a deck in the primary screen box to transport material onto the loading end of a corresponding deck in the secondary screen box. The split of the decks allows the angle of screening to vary along the decks and also allows each individual screen box to operate at higher speeds and amplitudes, which equates to better performance. Fig. 1 (prior art) shows a known split-deck screening apparatus (a) having two decks for screening bulk material and comprising a main subframe (B) mountable on a main frame (not shown), a primary screen box (C) comprising a plurality of vertically stacked screening decks (not shown) having a loading end (D1) for receiving a supply of bulk material and an opposite discharge end (E1) for discharging unscreened material, a secondary screen box (F) mounted to the main subframe comprising a plurality of screening decks (not shown) and having a loading end (D2) adjacent to the discharge end (E1) of the primary screen box and an opposite discharge end (E2) for discharging unscreened material, a primary screen frame (F) coupled to the main subframe and having a discharge end (G) and a loading end (H), and a tilting mechanism (I) for tilting the primary screen box subframe downwardly relative to the main subframe towards the secondary screen box. One problem with split platform multi-platform arrangements of this type is that the primary and secondary screen boxes are mounted to the main subframe in a fixed position. Thus, if one of the lower decks of the secondary screen box requires maintenance (which is common for screening decks for screening quarry bulk material), the upper deck has to be removed in order to obtain access to the lower deck, which is a difficult and time consuming operation. This problem is further compounded by the fact that screening plant machines are often located at remote sites and must be serviced on site, which involves taking specialized lifting equipment to the machine itself rather than taking the machine to a repair site. The object of the present invention is to overcome at least one of the above problems. Disclosure of Invention This object is achieved by providing a split platform screening arrangement according to the preamble of claim 1, wherein the arrangement comprises a subframe carriage to which the primary box frame is attached, and wherein the subframe carriage is mounted to the main subframe and is actuatable to move the primary box frame upwards and away from the secondary screen box. This causes the primary screen box (and associated subframe) to move from an operative position (as shown in fig. 2 or 4 (tilted)) to a non-operative position spaced laterally and vertically from the secondary box, as shown in fig. 6 and 7. This movement of the primary screen box up and away from the secondary screen box allows access to the front end of the secondary screen box, allowing maintenance to be perform