Returned material screening assembly of mobile crusher and mobile crusher

Abstract

The utility model discloses a returned material screening assembly of a mobile crusher and the mobile crusher, which comprise a transition frame arranged at the front end of the mobile crusher, and an under-screen conveying belt is arranged on the transition frame. The end, close to the end transition frame, of the under-screen conveying belt is rotationally connected with the transition frame so that the under-screen conveying belt can rotate upwards or downwards around a rotating point. The material returning screen is mounted on the under-screen conveying belt through a spring; the first oil cylinder is located above the transition frame and the under-screen conveying belt, one end of the first oil cylinder is rotationally connected with the front end of the movable crusher, and the other end of the first oil cylinder is rotationally connected with the middle of the under-screen conveying belt. The first oil cylinder extends out to drive the under-screen conveying belt to rotate downwards, the under-screen conveying belt drives the material returning screen to be far away from the main conveying belt downwards so as to be in a descending state, and the material returning screen is far away from the main conveying belt and can form a relatively large operation space, so that overhaul and maintenance of the material returning screen are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to a return material screening assembly of a mobile crusher and the mobile crusher. Background Art

[0002] The return material screening assembly of the mobile crusher is mainly composed of a return material screen and an under-screen conveyor belt. The return material screen is placed on the under-screen conveyor belt by a spring to form a return material screening assembly. The traditional fixing method of the screening assembly is that the return material screen is directly fixed on the transition frame, or the under-screen conveyor belt is fixed on the transition frame, and the return material screen is fixed on the transition frame by a spring. Under this fixing form, since the return material screen is fixed and located below the main conveyor belt, the distance between the return material screen and the main conveyor belt is very small. Therefore, when the return material screen needs to be inspected and maintained, such as when replacing the screen, the transition frame and the return material screen, under-screen conveyor belt, transition conveyor belt, etc. on it need to be lowered together. The oil cylinder is subjected to a large pulling force, and a cylinder with a larger pulling force needs to be selected, which increases the cost. At the same time, after the transition frame is lowered as a whole, the operating space is still limited, which is not easy to operate, affecting the replacement operation. Utility Model Content

[0003] In view of the above shortcomings, the utility model provides a return material screening assembly for a mobile crusher, which can solve the problems of increased pulling force required for the oil cylinder used in the existing return material screening assembly and limited maintenance and operation space.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A return material screening assembly of a mobile crusher includes:

[0006] A transition frame, which is installed at the front end of the mobile crusher;

[0007] An under-screen conveyor belt is mounted on the transition frame, wherein an end of the under-screen conveyor belt close to the end transition frame is rotatably connected to the transition frame so that the under-screen conveyor belt can rotate upward or downward around a rotation point;

[0008] A return screen, which is mounted on the conveyor belt under the screen through a spring;

[0009] The first oil cylinder is located above the transition frame and the under-screen conveyor belt. One end of the first oil cylinder is rotatably connected to the front end of the mobile crusher, and the other end is rotatably connected to the middle part of the under-screen conveyor belt.

[0010] Furthermore, a first pull rod is provided on the under-screen conveyor belt, the first pull rod comprising a first outer rod and a first inner rod which are sleeved on each other, the outer end of the first inner rod being rotatably connected to the under-screen conveyor belt, and the outer end of the first outer rod being rotatably connected to the front end of the mobile crusher;

[0011] The first pull rod and the first oil cylinder extend in the same direction;

[0012] The first outer rod and the first inner rod are respectively provided with a first pin hole, and when the under-screen conveyor belt rotates upward to the working state or rotates downward to the lowering state, the first pin holes on the first outer rod and the first inner rod are opposite to and can be inserted with a first limiting pin shaft.

[0013] Furthermore, a third pin hole is provided on the end of the transition frame away from the return screen and the front end of the mobile crusher, and a rotating pin shaft is inserted into the third pin hole;

[0014] The transition frame is provided with a second pull rod, the second pull rod includes a second outer rod and a second inner rod which are sleeved with each other, the outer end of the second inner rod is rotatably connected to the transition frame, and the outer end of the second outer rod is rotatably connected to the front end of the mobile crusher;

[0015] The second outer rod and the second inner rod are respectively provided with a second pin hole, and when the second pull rod is extended, the second pin holes on the second outer rod and the second inner rod face each other and can be inserted with a second limiting pin shaft.

[0016] Furthermore, the bottom of the under-screen conveyor belt is provided with support feet that can be opened or folded.

[0017] Furthermore, the return screen includes a return screen box, a vibration motor installed on the return screen box, an upper screen arranged on the top of the return screen box, and a lower screen located below the upper screen, wherein the upper screen and the lower screen are located inside the screen box;

[0018] There are two vibration motors, which are respectively mounted on the outside of the return screen box through motor mounting frames. The output shaft of the vibration motor extends inwardly into the inside of the screening box and is located between the upper screen and the lower screen. An eccentric piece is provided on the output shaft of the vibration motor; a sleeve is provided on the motor mounting frame, and the sleeve is located in the screening box and is sleeved on the outside of the output shafts of the vibration motors on both sides. The two ends of the sleeve are respectively connected to the motor mounting frames on both sides so that the sleeve forms a relatively closed chamber.

[0019] Furthermore, the sleeve is provided with a maintenance window at a middle position, and a window baffle is detachably provided at a position corresponding to the maintenance window.

[0020] Furthermore, there are multiple upper screens, which are arranged in sequence longitudinally and cover the top opening of the return screen box;

[0021] The upper screen is provided with a first bending part which is bent upward on both sides, and the first bending part forms a first clamping hole;

[0022] The return screen box is provided with a hooking strip on both sides at positions corresponding to the first bending part, the cross section of the hooking strip is U-shaped, one side of the hooking strip is hooked into the first clamping hole, and the hooking strip is detachably arranged on the return screen box.

[0023] Further, the lower screen is provided with a second bending part which is bent downward on both ends, and the second bending part forms a second clamping hole;

[0024] The return screen box is fixedly provided with a fixed positioning plate and a movable tension plate, long strip holes are formed on both sides of the middle part of the return screen box, both ends of the movable tension plate pass through the long strip holes to pass out of the return screen box and can move along the length direction of the long strip holes; the second bending parts on both ends of the lower screen hook the fixed positioning plate and the movable tension plate through the second clamping holes respectively;

[0025] Both sides of the return screen box are fixedly provided with a fixed base plate and movably provided with a movable base plate, the fixed base plate is provided with a first through hole, and the movable base plate is provided with a first threaded hole opposite the first through hole position, a screw rod passes through the first through hole and is screwed into the first threaded hole;

[0026] The movable base plate is attached to the side surface of the return screen box, and the movable base plate is provided with a through hole for passing through the end of the movable tension plate;

[0027] The lower screen is two, and the two lower screens are arranged side by side in front and back;

[0028] Corresponding two fixed positioning plates are arranged in the middle part of the return screen box, the movable tension plates are arranged at both ends of the return screen box, and the return screen box is provided with a maintenance window at both ends, and a maintenance window baffle is detachably arranged at positions corresponding to the maintenance window.

[0029] Further, the movable base plate is fixedly provided with a dustproof plate on one side of the return screen box, and the dustproof plate is attached to the side surface of the return screen box;

[0030] The dustproof plate is provided with a through hole with the same size as the end of the movable tension plate, so that the end of the movable tension plate can pass through the dustproof plate, and the dustproof plate covers the long strip hole.

[0031] The utility model also provides a mobile crusher, including the mobile crusher's return screen separation assembly of any one of the above.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] The utility model extends the first oil cylinder to drive the conveyor belt under the screen to rotate downward, and the conveyor belt under the screen drives the return screen downward away from the main conveyor belt to be in a lowered state. The return screen is away from the main conveyor belt and can form a relatively large operating space, so as to facilitate the inspection and maintenance of the return screen, such as the replacement of the screen mesh;

[0034] The first oil cylinder only needs to pull the return material screen and the under-screen conveyor belt. Compared with the method of pulling the transition rack and its upper components (mainly including the return material screen, the under-screen conveyor belt, the transition conveyor belt, etc.), the oil cylinder bears less pulling force, and there is no need to use an oil cylinder with larger pulling force, which reduces costs and can extend the service life of the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0036] Figure 1 This is a structural diagram of the return material screening assembly of the mobile crusher of the present utility model (working state);

[0037] Figure 2 This is a structural diagram of the return material screening assembly of the mobile crusher of the present utility model (descending state);

[0038] Figure 3 This is a schematic front view of the return material screening assembly of the mobile crusher of the present invention (descended state).

[0039] Figure 4 for Figure 2 A magnified schematic diagram of point A in the middle;

[0040] Figure 5 This is a schematic structural diagram of the return screen of the present utility model;

[0041] Figure 6 This is a schematic top view of the return screen of the present invention;

[0042] Figure 7 This is a schematic cross-sectional view of the return screen of the present utility model;

[0043] Figure 8 This is a schematic structural diagram of the vibration motor, motor mounting bracket, etc. of the present utility model;

[0044] Figure 9 It is a cross-sectional schematic diagram of the utility model vibration motor, motor mounting frame, etc.;

[0045] Figure 10 It is a structural diagram of the load-bearing frame, upper screen, etc. of the utility model;

[0046] Figure 11 This is a schematic diagram of the assembly of the upper screen and the hooking strip of the utility model;

[0047] Figure 12 for Figure 5 A magnified schematic diagram of point B in the middle;

[0048] Figure 13 for Figure 7 Enlarged schematic diagram of point C in the middle.

[0049] 10-Transition frame; 20-Under-screen conveyor belt; 31-Hooking bar; 32-Carrying frame; 33-Fixed positioning plate; 34-Movable tensioning plate; 35-Fixed base plate; 36-Movable base plate; 37-Screw; 38-Opening; 39-Dustproof plate; 310-Maintenance window baffle; 311-Dustproof baffle; 312-Elongated hole; 313-Spring; 315-Return screen box; 40-First oil cylinder; 51-First pull rod; 52-First outer rod; 53-First inner rod; 54-First pin hole; 55-Second pull rod; 60-Support Support foot; 70-vibration motor; 71-motor mounting bracket; 72-sleeve; 73-eccentric piece; 74-extension plate; 75-connecting rod; 76-window baffle; 77-ring; 78-reinforcement rib; 79-universal coupling; 80-upper screen; 81-first bending part; 82-first bayonet; 83-bolt and nut assembly; 90-lower screen; 91-second bending part; 92-second bayonet; 100-mobile crusher; 110-frame; 120-main conveyor belt; 130-side conveyor belt; 140-transition conveyor belt. DETAILED DESCRIPTION

[0050] The following will be combined with the accompanying drawings of 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 some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Please refer to Figures 1 to 13 On the one hand, a preferred embodiment of the present invention provides a return material screening assembly of a mobile crusher, which mainly includes a transition frame 10, an under-screen conveyor belt 20, a return material screen 30 and a first oil cylinder 40.

[0054] The transition frame 10 is mounted at the front end of the mobile crusher 100, specifically, on the frame 110 at the front end of the mobile crusher 100. Also provided at the front end of the mobile crusher 100 are a main conveyor belt 120, a side conveyor belt 130, and a transition conveyor belt 140. The main conveyor belt 120 is used to convey the material to be screened into the return screen 30. The transition conveyor belt 140 is used to convey material that fails to pass through the top screen of the return screen 30. The side conveyor belt 130 is used to convey material that fails to pass through the inner screen of the return screen 30. The under-screen conveyor belt 20 is used to convey material that has passed through the return screen 30. It is understood that if the return screen 30 does not have an inner screen, the side conveyor belt 130 may not be provided accordingly.

[0055] The under-screen conveyor belt 20 is installed on the transition frame 10. The end of the under-screen conveyor belt 20 near the end transition frame 10 is rotatably connected to the transition frame 10 so that the under-screen conveyor belt 20 can rotate upward or downward around the rotation point. When the under-screen conveyor belt 20 rotates upward, the return material screen 30 thereon can be brought close to the main conveyor belt 120 for easy feeding, and when the under-screen conveyor belt 20 rotates downward, the return material screen 30 thereon can be driven away from the main conveyor belt 120. At this time, a relatively large operating space can be formed to facilitate the inspection and maintenance of the return material screen, such as replacement of the screen.

[0056] The return screen 30 is mounted on the under-screen conveyor belt 20 via springs 313. Multiple springs 313 are provided, with the top of the spring 313 connected to the side of the box of the return screen 30 via a spring mounting seat, and a spring seat provided at the bottom for connecting to the under-screen conveyor belt 20, such as the main body of the screening station. At this time, the return screen 30 is mounted on the under-screen conveyor belt 20 via the springs 313, and the deformation and reset function of the springs 313 are used to achieve vibratory screening.

[0057] The first oil cylinder 40 is located above the transition shelf 10 and the under-screen conveyor belt 20, one end of the first oil cylinder 40 is rotatably connected to the front end of the mobile crusher, and the other end is rotatably connected to the middle part of the under-screen conveyor belt 20. In this embodiment, when the first oil cylinder 40 is retracted, it can pull the under-screen conveyor belt 20 to rotate upward, and make the under-screen conveyor belt 20 drive the return screen 30 to move upward to approach the main conveyor belt 120, so as to be in a working state (for reference Figure 1 ); when the first oil cylinder 40 is extended, it can pull the under-screen conveyor belt 20 to rotate downward, and make the under-screen conveyor belt 20 drive the return screen 30 to move downward to move away from the main conveyor belt 120, so as to be in a lowered state (for reference Figure 2 and Figure 3 ), at this time, the return screen 30 is away from the main conveyor belt 120, and a relatively large operation space can be formed to facilitate the maintenance and repair of the return screen, such as the replacement of the screen.

[0058] When screening is performed, the first oil cylinder 40 is retracted to pull the under-screen conveyor belt 20 to rotate upward, and the under-screen conveyor belt 20 drives the return screen 30 to move upward to approach the main conveyor belt 120, so as to be in a working state; when maintenance and repair of the return screen are needed, the first oil cylinder 40 is extended to pull the under-screen conveyor belt 20 to rotate downward, and the under-screen conveyor belt 20 drives the return screen 30 to move downward to move away from the main conveyor belt 120, so as to be in a lowered state, at this time, the return screen 30 is away from the main conveyor belt 120, and a relatively large operation space can be formed to facilitate the maintenance and repair of the return screen, such as the replacement of the screen. At the same time, since the first oil cylinder 40 only needs to pull the return screen 30 and the under-screen conveyor belt 20, compared with the method of pulling the transition shelf 10 and the parts above it (mainly including the return screen, the under-screen conveyor belt, the transition conveyor belt, etc.), the oil cylinder bears smaller tension, and does not need to select an oil cylinder with larger tension, thereby reducing the cost and prolonging the service life of the oil cylinder.

[0059] In a preferred embodiment, the under-screen conveyor belt 20 is further provided with a first tie rod 51. The first tie rod 51 comprises a first outer rod 52 and a first inner rod 53, which are nested together. The outer end of the first inner rod 53 is rotatably connected to the under-screen conveyor belt 20, while the outer end of the first outer rod 52 is rotatably connected to the frame 110 at the front end of the mobile crusher. The first tie rod 51 extends in the same direction as the first cylinder 40. A first pin hole 54 is provided in each of the first outer rod 52 and the first inner rod 53. When the under-screen conveyor belt 20 is rotated upward to the operating position or downward to the lowered position, the first pin holes 54 in the first outer rod 52 and the first inner rod 53 are aligned with and can be inserted into a first stop pin. The first stop pin inserted into the first pin hole 54 defines the position of the first outer rod 52 and the first inner rod 53, thereby providing a position limiter. The first tie rod 51 stabilizes the under-screen conveyor belt 20 when the under-screen conveyor belt 20 is rotated upward to the operating position or downward to the lowered position, assisting the first cylinder 40 in achieving this stability. When the first oil cylinder 40 needs to be extended or retracted, the first limiting pin can be removed.

[0060] A third pin hole is provided on the end of the transition frame 10 away from the return screen 30 and the frame 110 at the front end of the mobile crusher. A rotating pin is inserted into the third pin hole, allowing the transition frame 10 to rotate relative to the front end of the mobile crusher. When the rotating pin is removed, the transition frame 10 can be separated from the front end of the mobile crusher. A second pull rod 55 is provided on the transition frame 10. The second pull rod 55 includes a second outer rod and a second inner rod that are sleeved together. The outer end of the second inner rod is rotatably connected to the transition frame 10, and the outer end of the second outer rod is rotatably connected to the front end of the mobile crusher. A second pin hole is provided on the second outer rod and the second inner rod, respectively. When the second pull rod 55 is extended, the second pin holes on the second outer rod and the second inner rod are aligned with and can accommodate the insertion of a second limit pin. By providing the rotating pin and the second pull rod 55, the transition frame 10 can be rotated downward when necessary to create a larger space between the return screen 30 and the main conveyor belt 120.

[0061] The bottom of the under-screen conveyor belt 20 is provided with an openable or foldable support foot 60. By providing the support foot 60, when the under-screen conveyor belt 20 drives the return material screen 30 downward away from the main conveyor belt 120 and is in a lowered state, the support foot 60 is opened so that the support foot 60 touches the ground, thereby achieving support for the under-screen conveyor belt 20 and the return material screen 30 thereon through the support foot 60.

[0062] The return screen 30 mainly includes a return screen box 315 , a vibration motor 70 installed on the return screen box 315 , an upper screen 80 arranged on the top of the return screen box 315 , and a lower screen 90 located below the upper screen 80 .

[0063] The return screen box 315 is a chamber structure with open top and bottom. The upper screen 80 and the lower screen 90 are located inside the return screen box 315. The upper screen 80 is located at the open top of the return screen box 315, lower than the top of the return screen box 315 to form a groove structure with the top of the return screen box 315. This facilitates the temporary accumulation of material on the upper screen 80 after it falls, rather than falling out from the side of the return screen box 315. Of course, it is understandable that the return screen box 315 of the return screen is tilted as a whole, and the upper screen 80 is also tilted, so that material that cannot pass through the upper screen 80 will exit from the lower end.

[0064] Springs 313 are provided on both sides of the return screen box 315. The return screen box 315 is installed on the under-screen conveyor belt 20 through the springs 313. Vibration screening is achieved through the deformation and reset function of the springs 313.

[0065] Preferably, there are two vibration motors 70, each mounted on the outside of the return material screen housing 315 via a motor mounting bracket 71. The motor mounting bracket 71 is fixedly mounted on the side of the return material screen housing 315 and extends into the interior of the return material screen housing 315. The output shaft of the vibration motor 70 extends inwardly into the inside of the return material screen housing 10 and is located between the upper screen 80 and the lower screen 90. An eccentric member 73 is provided on the output shaft of the vibration motor 70. When the vibration motor 70 is running, it drives the output shaft and the eccentric member 73 thereon to rotate together. The centrifugal force generated by the high-speed rotation of the output shaft and the eccentric member 73 thereon generates an exciting force, thereby achieving vibration. The two vibration motors 70 are arranged relative to each other and are located in the middle of the return material screen housing 315 to better drive the return material screen to vibrate. The output shafts of the two vibration motors 70 are connected to each other and are connected to each other at the connection point by a universal coupling 79. The movement of the eccentric members 73 on the output shafts of the two vibration motors 70 is consistent. The vibration motor 70 is a 64KN high-power vibration motor with a strong amplitude, which can screen larger and heavier materials.

[0066] Motor mounting bracket 71 is provided with sleeve 72. Sleeve 72 is located within return screen housing 315 and sleeved around the output shafts of the vibration motors 70 on either side. The two ends of sleeve 72 are connected to the motor mounting brackets 71 on either side, forming a relatively closed chamber. The relatively closed chamber formed by sleeve 72 and motor mounting brackets 71 on either side effectively prevents material and generated dust from acting on the output shaft and its eccentric member, effectively protecting the output shaft and its eccentric member from interference from material and generated dust, ensuring smooth rotation and preventing damage to the output shaft and its eccentric member. This extends the service life of the vibration motor and ensures the proper operation of the return screen.

[0067] Extension plates 74 are provided on both sides of the motor mounting frame 71. The extension plates 74 of the two motor mounting frames 71 on both sides are arranged opposite to each other and are connected by connecting rods 75. By providing the connecting rods 75, the motor mounting frames 71 on both sides are connected to each other, thereby enhancing the stability of the motor mounting frames 71, preventing the motor mounting frames 71 from loosening during vibration and affecting the stability of the sleeve 72, and ensuring that the output shafts of the two vibration motors 70 on both sides are aligned. A maintenance window is provided at the middle position of the sleeve 72, and a window baffle 76 is detachably provided at a position corresponding to the maintenance window. The detachable connection is a bolt connection. The maintenance window is aligned with the position of the eccentric member 73, the universal coupling 29, etc., so that when maintenance is required, the window baffle 76 can be temporarily removed for maintenance, and the entire sleeve 72 can be removed without any need to remove it, thereby improving maintenance efficiency. Both ends of the sleeve 72 are respectively provided with circular rings 77 coaxial with the sleeve 72. One side of the circular ring 77 is in contact with and connected to the motor mounting frame 71. The connection can be made by bolts. A reinforcing rib 78 is provided on the other side. The circular ring 77 can increase the contact area with the motor mounting frame 71 for easy installation. By providing the reinforcing rib 78, the reinforcing rib 78 is axially arranged and fixedly connected to the outer side of the circular ring 77 and the sleeve 72, respectively, thereby enhancing the connection strength between the sleeve 72 and the circular ring 77.

[0068] In a preferred embodiment, there are three upper screens 80, and the upper screens 80 are manganese steel woven screens, which are resistant to smashing and have high wear resistance. The three upper screens 80 are arranged in sequence longitudinally and cover the top opening of the return screen box 315. At this time, the upper screen 80 adopts a segmented design and is divided into three identical sections. When necessary, the three sections can be replaced with each other, which has high interchangeability and is convenient for after-sales maintenance. When one upper screen 80 is damaged, the upper screen 80 can be replaced separately without replacing all the upper screens 80, thereby shortening maintenance time and improving production efficiency. The upper screen 80 is provided with a first bending portion 31 that bends upward on both sides. The first bending portion 81 bends upward and then continues to bend toward the inside of the return screen box 315, forming an acute angle bend. The first bending portion 81 forms a first bayonet 82. The two sides of the return screen box 315 are provided with hooking strips 31 at positions corresponding to the first bending portion 81. The cross section of the hooking strips 31 is U-shaped as a whole. Figure 11One side of the hooking strip 31 is hooked into the first bayonet 82, and the U-shaped opening faces the outside of the return screen box 315. The hooking strip 31 is detachably arranged on the return screen box 315, and the detachable method is to connect the bolt and nut assembly 83. By tightening the bolt and nut assembly 83, the hooking strip 31 can be fixed to both sides of the return screen box 315, and when the bolt and nut assembly 83 is tightened, the hooking strip 31 can be moved back and forth to the outside of the material screen box 315. At this time, the first bayonet 82 formed by the first bent portion 81 is hooked by the hooking strip 31, which can realize the hooking and tightening of the upper screen 80 from both sides. The upper screen 80 is tightened by side tensioning, and the upper screen 80 is tightened by locking the hooking strip 31 with the bolt and nut assembly 83. The installation is quick and convenient, and the operation is simple.

[0069] A supporting frame 32 is fixedly provided at the top opening of the return screen box 315. The supporting frame 32 is a frame structure, and the upper screen 80 is placed on the supporting frame 32. The supporting frame 32 can support the upper screen 80 to a certain extent, and when the upper screen 80 has a certain degree of slack after long-term use, it can be taken up by the supporting frame 32, thereby slowing down the scrapping speed and extending the operation time.

[0070] In a preferred embodiment, each end of the lower screen 90 is provided with a downwardly curved second bend 91, forming a second opening 92. After bending downward, the second bend 91 further bends toward the inside of the return screen housing 315, forming an acute angle. The lower screen 90 adopts a banana screen structure, with a curved screen that allows for more thorough and clean screening of materials.

[0071] A fixed positioning plate 33 and a movable tensioning plate 34 are fixedly installed in the return screen box 315. An elongated hole 312 is formed on both sides of the middle portion of the return screen box 315. The length of the elongated hole 312 extends from the front and rear ends of the return screen box 315. Both ends of the movable tensioning plate 34 pass through the elongated hole 312 to pass out of the return screen box 315 and are movable within the elongated hole 312 along the length of the elongated hole 312. The second bent portions 91 at both ends of the lower screen 90 are hooked onto the fixed positioning plate 33 and the movable tensioning plate 34 through second latches 92. It is understood that when the movable tensioning plate 34 moves away from the fixed positioning plate 33, it drives the end of the lower screen 90 hooked onto the movable tensioning plate 34 to move away from the fixed positioning plate 33. At this time, the end hooked onto the fixed positioning plate 33 remains stationary, and the lower screen 90 is tightened.

[0072] A fixed base plate 35 and a movable base plate 36 are fixedly provided on both sides of the return screen housing 315. The fixed base plate 35 has a first through-hole, and the movable base plate 36 has a first threaded hole opposite the first through-hole. A screw 37 passes through the first through-hole and screws into the first threaded hole. The movable base plate 36 is attached to the side of the return screen housing 315. At this time, the fixed base plate 35, the movable base plate 36, and the screw 37 form a screw assembly. By turning the screw 37, the movable base plate 36 can be driven to move in the direction of the front and rear ends of the return screen housing 315. The movable base plate 36 is provided with a through-hole 38 for passing the end of the movable tensioning plate 34. When the end of the movable tensioning plate 34 enters the through-hole 38 of the movable base plate 36, it is restrained by the through-hole 38. When the movable base plate 36 moves back and forth in the front and rear ends of the return screen housing 315, it can also move back and forth in the front and rear ends of the return screen housing 315.

[0073] There are two lower screens 90, which are arranged side by side in front and back. The corresponding two fixed positioning plates 33 are respectively arranged in the middle of the return screen box 315, and the movable tensioning plates 34 are respectively arranged at both ends of the return screen box 315. Two sets of fixed base plates 35, movable base plates 36, and screws 37 are respectively provided, located at the front and rear ends of the return screen box 315. One set of fixed base plates 35, movable base plates 36, and screws 37 corresponds to one lower screen 90. During operation, by turning the screw 37, the movable base plates 36 are driven to move back and forth toward the end of the screen box 315, thereby driving the movable tensioning plates 34 to move back and forth toward the end of the screen box 315, thereby tightening the lower screen 90. The tightening method of the lower screen 90 is to tighten at both ends. The purpose of adjusting the tightening of the lower screen 90 is achieved by adjusting the tightness of the screw 37 at the end of the return screen box 315. The tightening form at both ends can eliminate the need for maintenance personnel to climb into the screen body to replace the screen, further improving the safety performance of maintenance personnel and avoiding unnecessary accidents.

[0074] The two ends of the return screen box 315 are respectively provided with maintenance windows, and maintenance window baffles 310 are detachably provided at the positions corresponding to the maintenance windows. When it is necessary to overhaul the lower screen 90, the maintenance window baffles 310 can be removed to achieve overhaul.

[0075] A dust shield 39 is fixedly mounted on one side of the movable base plate 36, which is attached to the return screen housing 315. The dust shield 39 is attached to the side of the return screen housing 315 and has a through-hole the same size as the end of the movable tensioning plate 34, allowing the end of the movable tensioning plate 34 to pass through the dust shield 39. The dust shield 39 covers the elongated hole 312. The dust shield 39 is made of a flexible rubber sheet. The elongated hole 312 is of a certain length, and the movable tensioning plate 34 needs to move within it, but it does not completely cover it. Dust generated by screening would then escape from the elongated hole 312 and fall onto the screw 37 and the screw hole of the movable base plate 36, hindering the screw 37 from turning. The dust shield 39 ensures that even if the movable base plate 36 moves, the dust shield 39 will cover the entire elongated hole 312, preventing dust from escaping and effectively preventing dust from interfering with the screw 37 and the screw hole of the movable base plate 36.

[0076] In a preferred embodiment, dust baffles 311 are respectively provided at the bottom edges of the return screen box 315. The dust baffles 311 are tilted inward and have a certain degree of flexibility. The flexible dust baffles 311 can be made of rubber plates, etc., because they have a certain degree of flexibility. When the return screen box 315 is downward, it can be tilted and deformed upward. When the return screen box 315 is upward, it can be unfolded to maintain contact with the under-screen conveyor belt 20 below the return screen box 315. On the one hand, it can effectively prevent the material coming out of the bottom of the return screen box 315 after screening from going out from both sides to prevent leakage. On the other hand, it can effectively prevent dust from spreading from the bottom to pollute the surrounding environment.

[0077] On the other hand, a preferred embodiment of the present invention further provides a mobile crusher, which includes the above-mentioned return material screening assembly of the mobile crusher.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A return material screening assembly for a mobile crusher, characterized in that: Includes: A transition frame, which is installed at the front end of the mobile crusher; An under-screen conveyor belt is mounted on the transition frame, wherein an end of the under-screen conveyor belt close to the end transition frame is rotatably connected to the transition frame so that the under-screen conveyor belt can rotate upward or downward around a rotation point; A return screen, which is mounted on the conveyor belt under the screen through a spring; The first oil cylinder is located above the transition frame and the under-screen conveyor belt. One end of the first oil cylinder is rotatably connected to the front end of the mobile crusher, and the other end is rotatably connected to the middle part of the under-screen conveyor belt.

2. The return material screening assembly of the mobile crusher according to claim 1, characterized in that: The under-screen conveyor belt is further provided with a first pull rod, the first pull rod comprising a first outer rod and a first inner rod which are sleeved with each other, the outer end of the first inner rod being rotatably connected to the under-screen conveyor belt, and the outer end of the first outer rod being rotatably connected to the front end of the mobile crusher; The first pull rod and the first oil cylinder extend in the same direction; The first outer rod and the first inner rod are respectively provided with a first pin hole, and when the under-screen conveyor belt rotates upward to the working state or rotates downward to the lowering state, the first pin holes on the first outer rod and the first inner rod are opposite to and can be inserted with a first limiting pin shaft.

3. The return material screening assembly of the mobile crusher according to claim 1, characterized in that: A third pin hole is provided on the end of the transition frame away from the return screen and the front end of the mobile crusher, and a rotating pin shaft is inserted into the third pin hole; The transition frame is provided with a second pull rod, the second pull rod includes a second outer rod and a second inner rod which are sleeved with each other, the outer end of the second inner rod is rotatably connected to the transition frame, and the outer end of the second outer rod is rotatably connected to the front end of the mobile crusher; The second outer rod and the second inner rod are respectively provided with a second pin hole, and when the second pull rod is extended, the second pin holes on the second outer rod and the second inner rod face each other and can be inserted with a second limiting pin shaft.

4. The return material screening assembly of the mobile crusher according to claim 1, characterized in that: The bottom of the under-screen conveyor belt is provided with support feet that can be opened or folded.

5. The return material screening assembly of the mobile crusher according to claim 1, characterized in that: The return screen includes a return screen box, a vibration motor installed on the return screen box, an upper screen arranged on the top of the return screen box, and a lower screen located below the upper screen, wherein the upper screen and the lower screen are located inside the screen box; There are two vibration motors, which are respectively mounted on the outside of the return screen box through motor mounting frames. The output shaft of the vibration motor extends inwardly into the inside of the screening box and is located between the upper screen and the lower screen. An eccentric piece is provided on the output shaft of the vibration motor; a sleeve is provided on the motor mounting frame, and the sleeve is located in the screening box and is sleeved on the outside of the output shafts of the vibration motors on both sides. The two ends of the sleeve are respectively connected to the motor mounting frames on both sides so that the sleeve forms a relatively closed chamber.

6. The return material screening assembly of the mobile crusher according to claim 5, characterized in that: The sleeve is provided with a maintenance window at a middle position, and a window baffle is detachably provided at a position corresponding to the maintenance window.

7. The return material screening assembly of the mobile crusher according to claim 5, characterized in that: There are multiple upper screens, which are arranged in sequence longitudinally and cover the top opening of the return screen box; Both sides of the upper screen are respectively provided with a first bending portion bent upward, and the first bending portion forms a first bayonet; Tightening strips are provided on both sides of the return screen box at positions corresponding to the first bending portion. The cross section of the tightening strip is U-shaped, and one side of the tightening strip is hooked into the first bayonet. The tightening strip is detachably provided on the return screen box.

8. The return material screening assembly of the mobile crusher according to claim 5, characterized in that: The two ends of the lower screen are respectively provided with a second bending portion bent downward, and the second bending portion forms a second bayonet; A fixed positioning plate and a movable tensioning plate are fixedly provided in the return material screen box, and long holes are respectively opened on both sides of the middle of the return material screen box, and the two ends of the movable tensioning plate pass through the long holes to pass through the return material screen box and can move in the long holes along the length direction of the long holes; the second bent parts at both ends of the lower screen are hooked on the fixed positioning plate and the movable tensioning plate respectively through the second bayonet; A fixed base plate and a movable base plate are fixedly provided on both sides of the return screen box, respectively. A first through hole is provided on the fixed base plate, and a first threaded hole is provided on the movable base plate at a position opposite to the first through hole. A screw passes through the first through hole and is screwed into the first threaded hole. The movable base plate is attached to the side surface of the return screen box, and the movable base plate is provided with a through hole for passing the end of the movable tensioning plate; There are two lower screens, and the two lower screens are arranged side by side in front and back; The corresponding two fixed positioning plates are respectively arranged in the middle of the return material screen box body, and the movable tensioning plates are respectively arranged at both ends of the return material screen box body. Maintenance windows are respectively provided at both ends of the return material screen box body, and maintenance window baffles are detachably provided at the positions corresponding to the maintenance windows.

9. The return material screening assembly of the mobile crusher according to claim 8, characterized in that: The movable base plate is attached to one side of the return material screen box and is fixed with a dustproof plate, and the dustproof plate is attached to the side of the return material screen box; The dustproof plate is provided with a through hole of the same size as the end of the movable tensioning plate so that the end of the movable tensioning plate can pass through the dustproof plate, and the dustproof plate covers the long hole.

10. A mobile crusher, characterized in that: A return material screening assembly comprising the mobile crusher according to any one of claims 1 to 9.

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