Rotary rake tooth screen

Abstract

The utility model discloses a rotary rake tooth screen which comprises a main body frame, a first conveying unit, a second conveying unit and a plurality of rotary rake units. The rotary harrow unit comprises a rotary chain assembly, a plurality of harrow teeth and a plurality of harrow brushes; the first conveying unit and the second conveying unit are adjacently arranged on the main body frame; the rotary chain assembly is arranged above the first conveying unit and provided with two chains capable of moving in the circumferential direction, and the moving direction of the two chains is perpendicular to the conveying direction of the first conveying unit. The plurality of rake teeth and the plurality of rake brushes are respectively arranged between the two chains and are distributed along the circumferential directions of the two chains; wherein the plurality of rake teeth circumferentially move along with the two chains and are used for raking light materials in the mixed materials conveyed by the first conveying unit and bringing the light materials into the second conveying unit, and the plurality of rake brushes circumferentially move along with the two chains and are used for sweeping small and medium light materials in the mixed materials conveyed by the first conveying unit and bringing the small and medium light materials into the second conveying unit.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage separation, in particular to a rotary rake screen. Background Art

[0002] At present, the rotary rake screen is highly valued in the field of separation of light and heavy garbage in the environmental protection industry, especially in the separation of stale garbage and domestic garbage, with obvious effects. The structure of the rotary rake screen mainly consists of a base, a shield, a mixture conveyor, a light material conveyor, several rotary rake devices, a rake cleaning device, an air source, a transmission system, etc. After the machine is turned on, the rotary rake device rotates at high speed. The rotary rake is equipped with elastic rake teeth, which rotate along a prescribed path. When the mixed material enters the equipment through the mixture conveyor, the moving elastic rake teeth will quickly rake up the light material and drag it to the light material conveyor on the side. Due to the limited elastic force of the rake teeth, it is unable to move heavy materials (such as large stones), so the heavy materials remain on the mixture conveyor, thereby achieving the purpose of separating light and heavy materials.

[0003] However, the tooth screen of the current rotary rake device maintains a certain distance between each rake tooth, that is, there are gaps between each rake tooth. Small and medium-sized light materials, such as paper and plastic, can easily penetrate and slip through the gaps between the rake teeth and cannot be taken away by the rake teeth. As a result, some small and medium-sized light materials remain in the pile of heavy materials. In other words, the existing rotary rake tooth screen is not very effective in screening small and medium-sized light materials.

[0004] In addition, although the existing rotary rake screen is equipped with an air supply device, since the air supply device is arranged longitudinally along the mixture conveyor, that is, parallel to the running direction of the material, that is, perpendicular to the cross-section of the mixed material pile, the air blown out from the air nozzle of the air supply device cannot cover the entire area of ​​the mixed material pile, but can only blow locally, and the air blown out from the air nozzle is a line, and the air blown to the material pile is a point; that is, the air supply device of the existing rotary rake screen cannot fully play its role. Utility Model Content

[0005] In view of this, the utility model provides a rotary rake tooth screen, which helps to improve the screening effect of the rotary rake tooth screen on small and medium-sized light materials.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A rotary rake screen comprises: a main frame, a first conveying unit, a second conveying unit and a plurality of rotary rake units;

[0008] The rotary rake unit includes: a rotary chain assembly, a plurality of rake teeth and a plurality of rake brushes;

[0009] The first conveying unit and the second conveying unit are adjacently arranged on the main frame;

[0010] The rotary chain assembly is arranged above the first conveying unit and has two chains capable of circumferential movement, and the movement directions of the two chains are perpendicular to the conveying direction of the first conveying unit;

[0011] The plurality of rake teeth and the plurality of rake brushes are respectively arranged between the two chains and distributed along the circumference of the two chains; wherein the plurality of rake teeth move circumferentially with the two chains, and are used to rake up the light materials in the mixed material transported by the first conveying unit and bring them to the second conveying unit, and the plurality of rake brushes move circumferentially with the two chains, and are used to sweep up small and medium-sized light materials in the mixed material transported by the first conveying unit and bring them to the second conveying unit.

[0012] Preferably, a plurality of rake teeth are spaced between two adjacent rake brushes.

[0013] Preferably, the raking brush is a flexible raking brush.

[0014] Preferably, the rotary rake unit further comprises a plurality of rake brush supports;

[0015] The plurality of rake brush supports are respectively arranged between the two chains and distributed along the circumference of the two chains;

[0016] The plurality of flexible rake brushes are arranged one by one on the plurality of rake brush brackets.

[0017] Preferably, the flexible rake brush comprises: flexible bristles and a rake brush carrier;

[0018] The rake brush carrier is arranged on the rake brush bracket;

[0019] The flexible bristles are densely arranged on the rake brush carrier and distributed between the two chains.

[0020] Preferably, the rotary chain assembly further comprises: a driving shaft assembly and a driven shaft assembly;

[0021] The arrangement direction of the driving shaft assembly and the driven shaft assembly is parallel to the conveying direction of the first conveying unit, and the driven shaft assembly is closer to the first conveying unit than the driving shaft assembly;

[0022] The first chain of the two chains is respectively engaged with one end of the driving shaft assembly and the driven shaft assembly, and the second chain is respectively engaged with the other end of the driving shaft assembly and the driven shaft assembly;

[0023] The rotary rake screen also includes an air supply unit;

[0024] The air supply unit is arranged on the driven shaft assembly and can rotate with the driven shaft assembly; wherein, the air supply unit has air outlet slots and is distributed along the axial direction of the driven shaft assembly.

[0025] Preferably, the driven shaft assembly comprises: a driven shaft and two driven sprockets respectively sleeved on both ends of the driven shaft;

[0026] One side of the first chain and the second chain are meshed with the driven sprockets at both ends of the driven shaft one by one;

[0027] The air supply unit is arranged on the outer wall of the middle part of the driven shaft and is located between the two driven sprockets.

[0028] Preferably, the air supply unit comprises: an air knife, a rotary joint, a solenoid valve, an air pipe and an air source;

[0029] An air duct is provided in the driven shaft, and a first end of the air duct passes through the first end surface of the driven shaft, and a second end passes through the outer wall of the middle portion of the driven shaft;

[0030] The rotary joint is provided at the first end of the air duct;

[0031] The air pipe is connected between the air source and the rotary joint and is provided with the solenoid valve;

[0032] The wind knife is arranged on the outer side of the middle part of the driven shaft, and the air inlet thereof is communicated with the second end of the air duct, and the air outlet slots are distributed along the blade of the wind knife.

[0033] Preferably, the air inlet of the air knife is located at one end of the air knife and close to the first end surface of the driven shaft;

[0034] The second end of the air duct is located between the first end surface of the driven shaft and the air inlet of the air knife;

[0035] The air supply unit also includes a quick-connect connector;

[0036] One end of the quick-connect connector is plugged into the second end of the air duct, and the other end is plugged into the air inlet of the air knife.

[0037] Preferably, the air supply unit further includes an air knife bracket;

[0038] The air knife bracket is arranged on the outer side of the middle part of the driven shaft;

[0039] The air knife is arranged on the air knife bracket.

[0040] From the above technical scheme can be seen, the rotary rake tooth screen provided by the utility model, along the circumferential direction of the two chains of the rotary chain assembly, not only is provided with a plurality of rake teeth, but also is provided with a plurality of rake brushes, so that the small pieces of light material falling from the rake tooth screen can be swept onto the second conveying unit, and the small pieces of light material that slip out of the rake tooth can also be separated onto the second conveying unit, avoiding the small pieces of light material remaining in the heavy material pile, thereby helping to improve the screening effect of the rotary rake tooth screen on the small pieces of light material. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0042] Figure 1 The appearance schematic view of the rotary rake tooth screen provided by the utility model embodiment is shown in the figure.

[0043] Figure 2 The operation schematic view of the inner rotary rake unit of the rotary rake tooth screen provided by the utility model embodiment is shown in the figure.

[0044] Figure 3 The operation schematic view of the rotary rake unit provided by the utility model embodiment is shown in the figure.

[0045] Figure 4 The structure schematic view of each row of rake teeth of the rotary rake unit provided by the utility model embodiment is shown in the figure.

[0046] Figure 5 The installation schematic view of the air supply unit on the driven shaft provided by the utility model embodiment is shown in the figure.

[0047] Figure 6 The air blowing schematic view of the air supply unit provided by the utility model embodiment is shown in the figure.

[0048] Figure 7 The position schematic view of the air knife and the mixture conveyor provided by the utility model embodiment is shown in the figure.

[0049] Figure 8 The structure side view of the air knife provided by the utility model embodiment is shown in the figure.

[0050] Figure 9 The structure top view of the air knife provided by the utility model embodiment is shown in the figure.

[0051] Among them, 1 is the main frame, 2 is the front shield, 3 is the rear shield, 4 is the rotary rake unit, 5 is the first conveying unit, 6 is the second conveying unit, 7 is the driving unit, 8 is the air source,

[0052] 9 is a rake tooth cleaning device, 10 is an auxiliary material transporter, 11 is a flexible rake brush, 12 is an adjusting sprocket, 13 is a tensioning sprocket, 14 is a drive shaft assembly, 15 is a driven shaft assembly, 16 is a chain, 17 is a rake tooth, 18 is an angle steel, 19 is a driven shaft, 20 is an air knife, 21 is a rotary joint, 22 is a solenoid valve, 23 is a quick plug connector, 24 is an air pipe, 25 is an air knife bracket, 26 is a rake brush bracket, 27 is a blade, and 28 is a rake brush. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] The rotary rake screen provided by the embodiment of the present invention is as follows: Figure 1 As shown, it includes: a main frame 1, a first conveying unit 5, a second conveying unit 6 and a plurality of rotary rake units 4;

[0055] like Figure 2 As shown, the rotary rake unit 4 includes: a rotary chain assembly, a plurality of rake teeth 17 and a plurality of rake brushes 28;

[0056] like Figure 1 As shown, the first conveying unit 5 and the second conveying unit 6 are adjacently arranged on the main frame 1;

[0057] like Figure 2 As shown, the rotary chain assembly is arranged above the first conveying unit 5 and has two chains 16 that can move circumferentially. The movement direction of the two chains 16 is perpendicular to the conveying direction of the first conveying unit 5.

[0058] A plurality of rake teeth 17 and a plurality of rake brushes 28 are respectively arranged between the two chains 16 and distributed along the circumference of the two chains 16; wherein, the plurality of rake teeth 17 move circumferentially with the two chains 16, and are used to rake up the light materials in the mixed material transported by the first conveying unit 5 and bring them to the second conveying unit 6, and the plurality of rake brushes 28 move circumferentially with the two chains 16, and are used to sweep up small and medium-sized light materials in the mixed material transported by the first conveying unit 5 and bring them to the second conveying unit 6.

[0059] It should be noted that if Figure 1As shown, the rotary rake tooth screen also includes: a front guard 2, a rear guard 3, a rake tooth cleaning device 9 and an auxiliary material conveyor 10; the auxiliary material conveyor 10 is arranged above the first conveying unit 5 and the second conveying unit 6, and the materials brought up by the rake teeth 1 or the rake brush 28 must pass through the auxiliary material conveyor 10 before being brought to the second conveying unit 6; the front guard 2 and the rear guard 3 are respectively arranged on the front and rear of the main frame 1, wherein the main frame 1 can be a base;

[0060] If there are multiple rotary rake units 4, they can be arranged in parallel and at intervals on the main frame 1; the first conveying unit 5 and the second conveying unit 6 are arranged in parallel and adjacent to each other on the main frame 1, the first conveying unit 5 is used to convey the mixed material, and the first conveying unit 5 can be a mixture conveyor, and the second conveying unit 6 is used to receive and convey the light material or small and medium-sized light material screened by the rotary rake unit 4, and the second conveying unit 6 can be a light material conveyor;

[0061] like Figure 2 As shown, the rotary chain assembly is arranged above the first conveying unit 5 and the second conveying unit 6, and the rotary chain assembly includes: a reduction motor, a driving shaft assembly 14, a driven shaft assembly 15, an adjusting sprocket 12, a tensioning sprocket 13, two chains 16 and a bracket; wherein the driving shaft assembly 14 includes: a driving shaft and two driving sprockets, and the driven shaft assembly 15 includes: a driven shaft 19 and two driven sprockets;

[0062] like Figure 2 As shown, the driving shaft is rotatably mounted on the bracket, and driving sprockets are respectively sleeved on both ends of the driving shaft 19. The driven shaft 19 is rotatably mounted on the bracket, and driven sprockets are respectively sleeved on both ends of the driven shaft 19. The driving shaft and the driven shaft 19 are distributed in parallel and are both parallel to the conveying direction of the first conveying unit 5. The driving shaft is located above the second conveying unit 6, and the driven shaft 19 is located above the first conveying unit 5.

[0063] Of the two chains 16, the first chain is engaged with a driving sprocket at one end of the driving shaft and a driven sprocket at one end of the driven shaft 19, respectively, and the second chain is engaged with a driving sprocket at the other end of the driving shaft and a driven sprocket at the other end of the driven shaft 19, respectively;

[0064] The adjusting sprocket 12 is provided on the bracket and is used to mesh with the portion of the chain 16 between the driving sprocket and the driven sprocket; the tensioning sprocket 13 is provided on the bracket and is used to mesh with the other portion of the chain 16 between the driving sprocket and the driven sprocket;

[0065] The reduction motor is arranged on the bracket, and its output end is connected to one end of the drive shaft through a coupling, which is used to drive the drive shaft assembly 14 to rotate, and then drive the two chains 16 to move synchronously in the circumferential direction, and then drive the multiple rake teeth 17 and the multiple rake brushes 28 to move in the circumferential direction with the two chains 16; of course, the multiple rake teeth 17 and the multiple rake brushes 28 are staggered to avoid interference between the multiple rake teeth 17 and the multiple rake brushes 28; wherein, the multiple rake teeth 17 move in the circumferential direction with the two chains 16, and are used to rake up the light materials in the mixed material delivered by the first conveying unit 5 and drag them to the second conveying unit 6, thereby achieving the mixed material in the Separation of light materials; multiple rake brushes 28 move circumferentially with the two chains 16, so that the multiple rake brushes 28 play the role of a broom, which is used to sweep up small and medium-sized light materials (or small and medium-sized particles of light materials) in the mixed material conveyed by the first conveying unit 5 and sweep them into the second conveying unit 6, thereby realizing the separation of small and medium-sized light materials in the mixed material, avoiding small and medium-sized light materials from remaining in the heavy material pile, and helping to improve the screening effect of the rotary rake tooth screen on small and medium-sized light materials; of course, considering the flexibility of the rake brush 28, the rake brush 28 cannot sweep heavy materials (such as large stones) into the second conveying unit 6 for separation.

[0066] In addition, in order to facilitate the bringing of small and medium-sized light materials that have drilled through and slipped away from the tooth gaps of the rake teeth 17 onto the second conveying unit 6, that is, to facilitate the sweeping of small and medium-sized light materials or small and medium-sized granular light materials that have been screened out by the rake teeth 17 onto the second conveying unit 6, multiple rake teeth 17 can be distributed one by one between two adjacent rake brushes 28, that is, among the multiple rake teeth 17 distributed circumferentially along the two chains 16, a rake brush 28 can be distributed between every two adjacent rake teeth 17, that is, a rake tooth 17 can be spaced between two adjacent rake brushes 28; of course, multiple rake teeth 17 can also be spaced between two adjacent rake brushes 28.

[0067] That is to say, in the rotary rake screen provided by this solution, not only a plurality of rake teeth 17 but also a plurality of rake brushes 28 are arranged along the circumference of the two chains 16 of the rotary chain assembly, which can sweep the small and medium-sized light materials screened out by the rake teeth 17 onto the second conveying unit 6, and can also separate the small and medium-sized light materials that slip out of the rake teeth 17 and remain on the side wall of the first conveying unit 5 onto the second conveying unit 6, avoiding the small and medium-sized light materials from remaining in the heavy material pile, thereby helping to improve the screening effect of the rotary rake screen on small and medium-sized light materials.

[0068] In this program, if Figure 2 As shown, there are several rake teeth 17 between two adjacent rake brushes 28. Among them, there can be one rake tooth 17, two rake teeth 17, three rake teeth 17, four rake teeth 17 or more material rake teeth 17 between two adjacent rake brushes 28, and as shown in FIG. Figure 2As shown, three rake teeth 17 may be spaced between two adjacent rake brushes 28, and five rake teeth 17 may be spaced between two adjacent rake brushes 28; that is, the actual number of rake brushes 28 may not be fixed and may be determined according to the working conditions;

[0069] In addition, if Figure 3 As shown, the rake brush 28 and the rake teeth 17 are arranged at the same height on the two chains 16 of the rotary rake unit 4. Figure 3 As shown, the rake brushes 28 and rake teeth 17 located on the horizontal sections of the two chains 16 are set at the same height, ensuring that the operating radius of the rake brushes 28 is the same as the operating radius of the rake teeth 17, so that the movement trajectory of the rake brushes 28 matches the conveying profile of the first conveying unit 5.

[0070] Specifically, if Figure 3 Shown, rake brush 28 is flexible rake brush 11. Just this rake brush 28 has flexibility, makes rake brush 28 can't sweep up the heavy material (such as large stone) in the mixture and bring on the second conveying unit 6, thereby guarantees that rake brush 28 can only separate medium and small piece light materials.

[0071] Furthermore, if Figure 3 As shown, the rotary rake unit 4 further includes a plurality of rake brush brackets 26;

[0072] A plurality of rake brush brackets 26 are respectively disposed between the two chains 16 and distributed along the circumference of the two chains 16;

[0073] The plurality of flexible rake brushes 11 are arranged one by one on the plurality of rake brush brackets 26. That is, the plurality of flexible rake brushes 11 are arranged one by one between the two chains 16 via the plurality of rake brush brackets 26, which can help improve the stability and reliability of the plurality of flexible rake brushes 11 being arranged between the two chains 16; wherein, the rake brush bracket 26 can be arranged across the two chains 16 and can serve as a support frame or mounting frame for the flexible rake brushes 11. The flexible rake brushes 11 are arranged on the rake brush bracket 26 and can be distributed between the two chains 16. In addition, the rake brush bracket 26 can be made of angle steel.

[0074] In addition, the flexible rake brush 11 can be a square strip flexible rake brush. Wherein, the flexible rake brush 11 can be a strip structure (such as Figure 3 As shown), it can be a square structure when viewed from the front, that is, the flexible rake brush 11 is a square strip brush, so as to facilitate better sweeping of small pieces of light matter or small and medium-sized particles of light matter in the mixed material pile onto the second conveying unit 6.

[0075] Furthermore, the flexible rake brush 11 comprises: flexible bristles and a bristle carrier;

[0076] The bristle carrier is provided on the rake brush bracket 26; wherein the bristle carrier can be a square bar carrier, and can be obtained by processing wood or nylon;

[0077] The flexible bristles are densely arranged on the bristle carrier and distributed between the two chains 16. The flexible bristles can be densely arranged on the edge of the bristle carrier along the length direction of the bristle carrier so that the flexible bristles form a square strip-shaped rake brush as described above and are distributed between the two chains 16. In this way, the flexible rake brush 11 can be formed into a square strip-shaped brush, which is convenient for sweeping the remaining small and medium-sized pieces of light matter or small and medium-sized particles of light matter in the mixed material pile into the second conveying unit 6. In this cycle, most of the light matter in the mixed material pile can be separated.

[0078] In this program, if Figure 2 As shown, as described above, the rotary chain assembly further comprises: a driving shaft assembly 14 and a driven shaft assembly 15;

[0079] The drive shaft assembly 14 and the driven shaft assembly 15 are arranged in a direction parallel to the conveying direction of the first conveying unit 5, and the driven shaft assembly 15 is closer to the first conveying unit 5 than the drive shaft assembly 14; wherein, the driven shaft assembly 15 is arranged above the first conveying unit 5, and the drive shaft assembly 14 is arranged above the second conveying unit 6 and is higher than the driven shaft assembly 15;

[0080] The first of the two chains 16 is respectively engaged with one end of the driving shaft assembly 14 and the driven shaft assembly 15, and the second chain is respectively engaged with the other end of the driving shaft assembly 14 and the driven shaft assembly 15; wherein the first chain is respectively engaged with the driving sprocket at one end of the driving shaft assembly 14 and the driven sprocket at one end of the driven shaft assembly 15, and the second chain is respectively engaged with the driving sprocket at the other end of the driving shaft assembly 14 and the driven sprocket at the other end of the driven shaft assembly 15;

[0081] The rotary rake screen also includes an air supply unit;

[0082] The air supply unit is arranged on the driven shaft assembly 15 and can rotate with the driven shaft assembly 15; wherein, the air supply unit has an air outlet slot and is distributed along the axial direction of the driven shaft assembly 15 so that the air blown out by the air supply unit is a surface. Figure 6As shown, the air supply area of ​​the air supply unit is formed into a cylinder by the surface, that is, a vortex blowing toward the second conveying unit 6 is formed, which is convenient for covering the entire area of ​​the mixed material pile, avoiding only local blowing, and ensuring that the air supply unit can fully play its role; and when the mixed material pile enters the screening area of ​​the rotary rake unit, the air supply area formed by the air supply unit is a cylindrical vortex air supply area, so that when the rake teeth 17 extend into and stir the mixed material pile, the vortex will quickly blow the light material away from the mixed material pile, and the rake teeth 17 that follow closely will bring it to the second conveying unit 6; in addition, the air supply pressure of the air supply unit can be adjusted according to actual conditions to avoid small pieces of heavy material being blown onto the second conveying unit 6 due to excessive wind pressure, and to avoid incomplete separation of light materials due to low wind pressure.

[0083] That is to say, the air supply unit of this scheme can be a rotating air supply unit that rotates with the driven shaft assembly 15, so as to form a cylindrical vortex air supply area, thereby better covering the entire area of ​​the mixed material pile, and also facilitates blowing light materials away from the mixed material pile, and then bringing them to the second conveying unit 6 by the rake teeth 17 that follow closely.

[0084] Furthermore, as described above, the driven shaft assembly 15 includes: a driven shaft 19 and two driven sprockets respectively sleeved on both ends of the driven shaft 19;

[0085] One side of the first chain and the second chain meshes with the driven sprockets at both ends of the driven shaft 19 one by one; correspondingly, the other side of the first chain and the second chain meshes with the driving sprockets at both ends of the driving shaft one by one;

[0086] like Figure 5 As shown, the air supply unit is arranged on the outer wall of the middle part of the driven shaft 19 and is located between two driven sprockets (not shown in the figure). This can avoid interference between the air supply unit and other components of the driven shaft assembly 15, and also facilitate the air supply unit to form a cylindrical vortex air supply area.

[0087] Specifically, if Figure 5 As shown, the air supply unit includes: an air knife 20, a rotary joint 21, a solenoid valve 22, an air pipe 24 and an air source 8;

[0088] An air duct is provided in the driven shaft 19, and a first end of the air duct passes through a first end surface of the driven shaft 19, and a second end passes through an outer wall of a middle portion of the driven shaft 19;

[0089] The rotary joint 21 is provided at the first end of the air duct;

[0090] The air pipe 24 is connected between the air source 8 and the rotary joint 21 and is provided with a solenoid valve 22;

[0091] The wind knife 20 is arranged outside the middle part of the driven shaft 19 , and its air inlet is connected to the second end of the air duct, and the air outlet slots are distributed along the blade 27 of the wind knife 20 .

[0092] It should be noted that if Figure 5 As shown, the air duct of the driven shaft 19 is the gas flow channel of the driven shaft 19, and its first end passes through the first end surface of the driven shaft 19 (as shown in FIG. Figure 5 The left end face of the driven shaft 19 in the middle), the second end passes through the outer wall of the middle part of the driven shaft 19; the air outlet end of the rotary joint 21 is connected to the first end of the air duct; one end of the air pipe 24 is connected to the air outlet of the air source 8, and the other end is connected to the air inlet end of the rotary joint 21, and the air source 8 can be a fan or an air compressor; the middle part of the air pipe 24 is provided with a solenoid valve 22, and the number of the solenoid valves 22 can be two, which are used to adjust the wind pressure (air volume) and the air supply timing according to the instructions of the controller respectively; the wind knife 20 is arranged on the outer side of the middle part of the driven shaft 19 through the wind knife bracket 25, wherein, as Figure 5 As shown, the air supply unit further includes an air knife bracket 25; the air knife bracket 25 is arranged on the outside of the middle part of the driven shaft 19; the air knife 20 is arranged on the air knife bracket 25, which can make the arrangement of the air knife 20 on the outside of the middle part of the driven shaft 19 more stable and reliable; the air knife bracket 25 can be a U-shaped air knife bracket, and the two side parts of the U-shaped air knife bracket can be welded to the outer wall of the middle part of the driven shaft 19, and the air knife 20 can be arranged on the outside of the middle part (horizontal part) of the U-shaped air knife bracket; as shown Figure 8 and Figure 9 As shown, the air outlet slots of the wind knife 20 are distributed along its blade 27, ensuring that the wind blown out by the wind knife 20 is a surface (air supply surface), as shown in FIG. Figure 5 As shown, the air supply surface can be parallel to the axial direction of the driven shaft 19 , that is, the air outlet slot of the wind knife 20 can be parallel to the axial direction of the driven shaft 19 .

[0093] Among them, the wind can be obtained from the wind source 8, and then pass through the solenoid valve 22 to control the air volume, air supply time, etc., and then enter the rotary joint 21 through the air pipe 24. The rotary joint 21 isolates the air pipe 24 from the movement state of the driven shaft 19 to prevent the air pipe 24 from rotating with the rotation of the driven shaft 19. After passing through the rotary joint 21, the wind enters the air duct of the driven shaft 19, and finally enters the wind knife 20 to discharge the air.

[0094] That is to say, the air supply unit of this solution adopts a wind knife 20 arranged on the driven shaft 19, and the wind blown out through its air outlet slot forms an air supply surface, and then a cylindrical vortex air supply area can be formed under the drive of the driven shaft 19. Compared with the air duct structure of the existing air supply device, this can obviously effectively improve the air supply effect of the air supply unit.

[0095] Furthermore, ifFigure 5 As shown, since there is a wind knife bracket 25 between the wind knife 20 and the outer wall of the middle part of the driven shaft 19, it is difficult to directly connect the second end of the air duct with the air inlet of the wind knife 20. In order to solve the above problem, the air inlet of the wind knife 20 is located at one end of the wind knife 20 (such as Figure 5 The left end portion of the wind blade 20 is close to the first end surface of the driven shaft 19;

[0096] The second end of the air duct is located between the first end surface of the driven shaft 19 and the air inlet of the air knife 20;

[0097] The air supply unit also includes a quick-connect connector 23;

[0098] One end of the quick connector 23 is plugged into the second end of the air duct, and the other end is plugged into the air inlet of the air knife 20. In other words, the second end of the air duct can be conveniently connected to the air inlet of the air knife 20 through the quick connector 23, that is, the second end of the air duct and the air inlet of the air knife 20 can be indirectly connected through the quick connector 23.

[0099] In this solution, the air supply unit also includes a static elimination device;

[0100] The static elimination device is arranged on one side of the air outlet direction of the air outlet slit of the wind knife 20, and is capable of ionizing oxygen molecules or water molecules in the air into positive and negative ions. The extension line of the ionization outlet of the static elimination device intersects with the air outlet direction of the air outlet slit of the wind knife 20, so that these positive and negative ions can be blown to the surface of the object that needs to eliminate static electricity and dust along with the air supply of the wind knife 20, so as to eliminate static electricity on the surface of the object and prevent materials and dust from sticking to the inner wall of the equipment. In addition, the wind knife 20 can use clean industrial compressed air as the air source, so as to facilitate the high-speed blowing of uniform, large-flow, high-intensity airflow; in addition, the static elimination device can use an ion rod, and an ionizer is installed inside the ion rod, which can ionize oxygen molecules or water molecules in the air into positive and negative ions.

[0101] That is to say, this solution adds a static elimination device to the air knife 20 so that the air knife 20 has a static elimination function, thereby facilitating the elimination of static electricity inside the equipment and preventing materials and dust from sticking to the inner wall of the equipment.

[0102] In addition, it should be noted that after the mixed material pile enters the rotary rake screen device, it first passes through the screening area of ​​the front rotary rake unit 4, and the rotary rake unit 4 drives the rake teeth 17 (such as Figure 4As shown in the figure, the rake teeth 17 rotate along a predetermined trajectory, and the rows of rake teeth 17 stir the mixed material pile horizontally. Since the movement direction of the rake teeth 17 is perpendicular to the direction of material conveying, the rake teeth 17 can drag light materials away from the mixed material pile and separate them, such as cloth strips, plastic bags, etc. However, since the rake teeth 17 are elastic, the lateral thrust they exert on the material is limited. When encountering large pieces of material, the rake teeth 17 will elastically bend and deform to pass over the large pieces of material, and only take away the light materials (such as Figure 2 As shown), after the mixed material pile passes through the screening area of ​​the rotary rake unit 4, most of the light materials have been dragged by the rake teeth and passed through the auxiliary material conveyor 10 to reach the light material conveyor, waiting to enter another process link, while the remaining heavy materials and a small part of the light materials enter the screening area of ​​the rotary rake unit 4 behind along the mixture conveyor.

[0103] When the remaining mixed material pile enters the screening area of ​​the rotary rake unit 4, due to the certain distance between the rake teeth, small and medium-sized pieces of light matter may drill out and slip away from the rake tooth gaps. However, since flexible rake brushes are arranged behind the rake teeth, these flexible rake brushes can be strip-shaped, and dense wear-resistant material bristles are arranged on the brushes. These flexible rake brushes are equivalent to brooms, which take away the remaining small and medium-sized pieces of light matter, especially the small and medium-sized pieces of light matter stranded on the side wall of the mixture conveyor and bring them into the light material conveyor. In this cycle, most of the light matter in the mixed material pile can be separated.

[0104] Mixture conveyor (first conveying unit 5): The reduction motor drives the active roller to rotate through the sprocket and chain, and the active roller drives the passive roller to rotate through the friction of the conveyor belt.

[0105] Light material conveyor (second conveying unit 6): The reduction motor drives the active roller to rotate through the sprocket and chain, and the active roller drives the passive roller to rotate through the friction of the conveyor belt.

[0106] Auxiliary conveyor: The reduction motor drives the conveyor drum to rotate through the sprocket and chain.

[0107] Rotating rake unit: The reduction motor drives the drive shaft assembly (drive shaft component 14) to rotate through the coupling. The drive shaft assembly drives the driven shaft assembly (driven shaft component 15), two adjusting sprockets, and two tensioning sprockets to rotate through the drive sprockets and chains on both sides. Several angle steels are fixed between the two chains. Rake teeth or flexible brushes can be installed on the angle steels, so that the rake teeth and flexible brushes can move with the rotation of the chain; in addition, the air supply device (air supply unit) fixed on the driven shaft can rotate together with the rotation of the driven shaft.

[0108] The base and the cover are sealed to effectively prevent dust from escaping from inside the device.

[0109] In other words, this solution adopts a controllable rotating air supply device, which can control the operation of the solenoid valve according to the instructions of the controller to facilitate the adjustment of the wind pressure and air supply timing. A wind knife is added to the rotating air supply device. The wind blown out by the wind knife is a surface, which will form a cylindrical vortex air supply area after rotation.

[0110] Among them, this scheme changes the traditional fixed-position tubular air supply structure into a rotary air supply device, and installs a wind knife on the driven shaft. The wind blown out by the wind knife is a surface. When the driven shaft rotates, the air supply area changes from a surface to a cylinder, which can cover the entire area of ​​the mixed material pile. Of course, it will also form a vortex blowing towards the light material conveyor, and the air supply pressure of the rotary air supply device can be adjusted according to actual conditions to avoid small pieces of heavy materials being blown onto the light material conveyor due to excessive wind pressure; at the same time, the speed of the rotary rake unit is adjustable, which can not only save energy, but also reduce unnecessary wear between the rake teeth and the material pile and extend the service life of the rake teeth.

[0111] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0112] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotary rake screen, characterized in that: include: A main frame (1), a first conveying unit (5), a second conveying unit (6) and a plurality of rotary rake units (4); The rotary rake unit (4) comprises: a rotary chain assembly, a plurality of rake teeth (17) and a plurality of rake brushes (28); The first conveying unit (5) and the second conveying unit (6) are adjacently arranged on the main frame (1); The rotary chain assembly is arranged above the first conveying unit (5) and has two chains (16) capable of circumferential movement, and the movement direction of the two chains (16) is perpendicular to the conveying direction of the first conveying unit (5); The plurality of rake teeth (17) and the plurality of rake brushes (28) are respectively arranged between the two chains (16) and distributed along the circumference of the two chains (16); wherein the plurality of rake teeth (17) move circumferentially with the two chains (16) and are used to rake up the light materials in the mixed material transported by the first conveying unit (5) and bring them to the second conveying unit (6); the plurality of rake brushes (28) move circumferentially with the two chains (16) and are used to sweep up small and medium pieces of light materials in the mixed material transported by the first conveying unit (5) and bring them to the second conveying unit (6).

2. The rotary rake screen according to claim 1, characterized in that: A plurality of rake teeth (17) are spaced between two adjacent rake brushes (28).

3. The rotary rake screen according to claim 1, characterized in that: The raking brush (28) is a flexible raking brush (11).

4. The rotary rake screen according to claim 3, characterized in that: The rotary rake unit (4) further includes a plurality of rake brush brackets (26); The plurality of rake brush supports (26) are respectively arranged between the two chains (16) and distributed along the circumference of the two chains (16); The plurality of flexible rake brushes (11) are arranged one by one on the plurality of rake brush supports (26).

5. The rotary rake screen according to claim 4, characterized in that: The flexible rake brush (11) comprises: flexible bristles and a bristle carrier; The bristle carrier is arranged on the rake brush bracket (26); The flexible bristles are densely arranged on the bristle carrier and distributed between the two chains (16).

6. The rotary rake screen according to claim 1, characterized in that: The rotary chain assembly further comprises: a driving shaft assembly (14) and a driven shaft assembly (15); The drive shaft assembly (14) and the driven shaft assembly (15) are arranged in a direction parallel to the conveying direction of the first conveying unit (5), and the driven shaft assembly (15) is closer to the first conveying unit (5) than the drive shaft assembly (14); The first chain of the two chains (16) is respectively engaged with one end of the driving shaft assembly (14) and the driven shaft assembly (15), and the second chain is respectively engaged with the other end of the driving shaft assembly (14) and the driven shaft assembly (15); The rotary rake screen also includes an air supply unit; The air supply unit is arranged on the driven shaft assembly (15) and can rotate along with the driven shaft assembly (15); wherein the air supply unit has air outlet slots and is distributed along the axial direction of the driven shaft assembly (15).

7. The rotary rake screen according to claim 6, characterized in that: The driven shaft assembly (15) comprises: a driven shaft (19) and two driven sprockets respectively sleeved on both ends of the driven shaft (19); One side of the first chain and the second chain are meshed with driven sprockets at both ends of the driven shaft (19) one by one; The air supply unit is arranged on the outer wall of the middle part of the driven shaft (19) and is located between the two driven sprockets.

8. The rotary rake screen according to claim 7, characterized in that: The air supply unit comprises: an air knife (20), a rotary joint (21), a solenoid valve (22), an air pipe (24) and an air source (8); An air duct is provided in the driven shaft (19), and a first end of the air duct passes through a first end surface of the driven shaft (19), and a second end passes through an outer wall of a middle portion of the driven shaft (19); The rotary joint (21) is arranged at the first end of the air duct; The air pipe (24) is connected between the air source (8) and the rotary joint (21), and is provided with the solenoid valve (22); The wind knife (20) is arranged on the outside of the middle part of the driven shaft (19), and its air inlet is connected to the second end of the air duct, and the air outlet slots are distributed along the blade (27) of the wind knife (20).

9. The rotary rake screen according to claim 8, characterized in that: The air inlet of the wind knife (20) is located at one end of the wind knife (20) and is close to the first end surface of the driven shaft (19); The second end of the air duct is located between the first end surface of the driven shaft (19) and the air inlet of the air knife (20); The air supply unit further comprises a quick-connect connector (23); One end of the quick-connect connector (23) is plugged into the second end of the air duct, and the other end is plugged into the air inlet of the air knife (20).

10. The rotary rake screen according to claim 8, characterized in that: The air supply unit further includes an air knife bracket (25); The wind knife support (25) is arranged on the outside of the middle part of the driven shaft (19); The wind knife (20) is arranged on the wind knife bracket (25).

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