Coal screening device for thermal power generation

Abstract

The present invention belongs to the technical field of screening equipment, and in particular to a coal screening device for thermal power generation, comprising a housing and a vibrating screen assembly, wherein the vibrating screen assembly is provided with two groups, and the two vibrating screen assemblies are respectively hinged on two sliding shafts and arranged in an "X" shape; the upper ends of the two groups of vibrating screen assemblies are fixedly connected to the housing through a number of vibration-damping assemblies; a slider is extended from one side of the sliding shaft, and the slider is slidably arranged in a slide groove; a through avoidance groove is provided inside the sliding shaft and the slider; a rotating shaft connected to a rotating motor for transmission is provided in the bearing seat, and the rotating shaft is provided inside the avoidance groove, and a number of cleaning assemblies are provided on the rotating shaft, and the cleaning assemblies are provided in the space between four screens. The vibrating screen assembly is driven to vibrate up and down by the vibrating motor, and the cleaning assembly rotates to contact the screen while vibrating up and down, and vibrates and beats the screen with different degrees of force to avoid clogging of the screen, thereby further improving the screening efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of screening equipment, and in particular relates to a coal screening device for thermal power generation. Background Art

[0002] In thermal power plants, coal is generally used for power generation. The collected coal blocks are ground and crushed and then put into the coal bunker for combustion. However, some large particles of coal blocks or coal particles may be mixed in the coal powder, making it difficult to burn fully. Therefore, it is necessary to filter the coal powder before combustion to separate the large particles of coal blocks to ensure sufficient combustion; at the same time, it is necessary to filter the fine particles of coal powder and coal ash, and after recovery, add a binder to re-granulate the coal into a qualified particle size to facilitate sufficient combustion and avoid coal waste.

[0003] The advantages of a vibrating screen are its simple structure and low maintenance, making it suitable for screening dry materials. However, its disadvantages include relatively low screening efficiency, poor screening accuracy, and the screen's tendency to clog. Since coal is typically fine and wet, the use of a vibrating screen requires further improvement in screening efficiency. Summary of the Invention

[0004] In response to the technical problems existing in the background technology, the present invention provides a coal screening device for thermal power generation, which adopts a vibrating screening machine and designs the structure of the vibrating screening component so that it can efficiently filter and screen the coal, greatly reducing the clogging of the screen.

[0005] To achieve the above objectives, the technical solution provided by the present invention is:

[0006] A coal screening device for thermal power generation, comprising a box and a vibrating screen assembly, the vibrating screen assembly comprising a frame, a bottom plate and a screen mesh, two bottom plates are provided on both sides of the bottom end of the frame, and the two bottom plates are provided at a fixed distance; two screen meshes are provided on the frame above the bottom plate, and the two screen meshes are provided at a fixed distance; the vibrating screen assembly is provided with two groups, and the two vibrating screen assemblies are respectively hinged on two sliding shafts and arranged in an "X" shape; the upper ends of the two groups of vibrating screen assemblies are fixedly connected to the box through a number of vibration reduction assemblies; connecting parts are extended at both ends of the frame, and the two screen mesh assemblies are provided in pairs. The connecting parts at both ends are connected by a connecting assembly; slide grooves are provided on both sides of the box body, and a slider is extended to one side of the sliding shaft, and the slider is slidably set in the slide groove; a through avoidance groove is provided inside the sliding shaft and the slider; a bearing seat is provided on the box body outside the slide groove, and a rotating shaft connected to the rotating motor for transmission is provided in the bearing seat, and the rotating shaft is provided inside the avoidance groove, and a number of cleaning components are provided on the rotating shaft, and the cleaning components are provided in the space between the four screens, and the cleaning components can rotate to contact the four screens.

[0007] Preferably, the connecting assembly uses a hard connection method to fix the connecting parts at both ends of the screen assembly.

[0008] Preferably, the connecting assembly adopts a soft connection method to fix the connecting parts at both ends of the screen assembly; the connecting assembly includes a connecting rod, a spring 1, a spring 2, a slide cylinder, a rotating cylinder and a connecting shaft, and the two connecting parts on the same side are hinged with a connecting shaft, and a rotating cylinder is rotatably provided on both sides of the connecting shaft, and a number of sliding rods are provided on the upper and lower sides of the rotating cylinder; two slide cylinders are slidably provided on the connecting rod, and a number of protrusions are respectively provided on both sides of the slide cylinder, and sliding holes are provided in the protrusions, and the slide rods are slidably provided in the sliding holes; the two ends of the connecting rod are respectively threadedly connected with adjusting nuts, and a spring 2 is tightly provided on the adjusting nut, and the spring 2 is arranged tightly against the end face of the slide cylinder, and a spring 1 is sleeved on the connecting rod between the two slide cylinders, and the two ends of the spring 1 are respectively arranged tightly against the end face of the slide cylinder.

[0009] Preferably, the vibration damping assembly is fixed to the bottom end of the bracket, and the bracket is fixed to the inner wall of the box; the vibration damping assembly includes a fixed rod, a chassis and a pressure block, and the chassis is evenly distributed around the circumference with a number of connecting blocks fixedly connected to the fixed rod, and the fixed rod is fixed to the bottom end of the bracket; a pressure rod is extended from the bottom end of the pressure block, and the pressure rod is arranged through the inner hole of the chassis, and a spring three is sleeved on the pressure rod between the chassis and the pressure block, and a fixed block is provided at the bottom end of the pressure rod.

[0010] Preferably, a plurality of buffer steel bars are alternately arranged on the frame on the upper side of the screen.

[0011] Preferably, a conical cover is provided at the upper end of the box body, a feed hopper is provided at the upper end of the cover body, two feed channels are symmetrically provided inside the cover body, the upper end of the feed channel is connected to the feed hopper, and the lower end of the feed channel is provided opposite to the buffer steel rod.

[0012] Preferably, the lower end of the vibrating screen assembly is connected to a mounting frame, and a vibration motor is provided on the mounting frame.

[0013] Preferably, the cleaning assembly includes a mounting tube and a plurality of elastic strips hinged around the mounting tube, and two adjacent elastic strips are connected by a spring four.

[0014] Preferably, a first discharge port and a second discharge port are respectively provided at the bottom end of the frame and on the upper and lower sides of the screen.

[0015] Preferably, the inner bottom end of the box body is provided with material box one, material box two and material box three from the middle to both sides respectively, the material box one is arranged opposite to the cleaning component, the material box two is arranged opposite to the discharge port one, and the material box three is arranged opposite to the discharge port two.

[0016] The present invention has the following advantages and beneficial effects:

[0017] 1. The present invention designs a coal screening device. Compared with the traditional single-sided vibrating screen material, the present invention sets two screen assemblies arranged in an "X" shape. Without increasing the space occupied by the equipment, the original single-side feeding is changed to simultaneous two-sided feeding, which can filter out large pieces of material, medium-sized material (qualified material) and small particles and coal powder material to meet the needs of fine screening. It can greatly avoid the material from completely gathering on one side of the screen, thereby reducing the tool load of the screen and reducing the blockage of the screen.

[0018] Second, each vibrating screen assembly is hinged on two sliding shafts, and the sliding shafts and sliders are provided with through-avoidance grooves. A bearing seat is provided on the outer casing of the slide, and a rotating shaft connected to the rotating motor is provided inside the bearing seat. The rotating shaft is provided inside the avoidance groove, and a number of cleaning components are provided on the rotating shaft. The cleaning components are provided in the space between the four screens. When the vibrating screen assembly is working, the vibration motor drives the entire vibrating screen assembly to vibrate vertically up and down to screen the material. The sliding shaft and slider slide up and down without interfering with the rotating shaft. While vibrating up and down, the cleaning component rotates and contacts the four screens, periodically changing the distance between the screens and the cleaning component. The screens can be vibrated and slapped with different degrees of force to prevent clogging of the screens, further improving screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural diagram of the box provided by the present invention;

[0020] Figure 2 A half-section view of the box provided by the present invention;

[0021] Figure 3 An isometric cross-sectional view of the box provided by the present invention;

[0022] Figure 4 A half-section diagram of the coal screening device and the box provided by the present invention;

[0023] Figure 5 A structural diagram of the coal screening device provided by the present invention;

[0024] Figure 6 for Figure 5 A partial enlarged view of point b in the middle;

[0025] Figure 7 for Figure 5 A partial enlarged view of point c in the middle;

[0026] Figure 8 A half-section diagram of the coal screening device provided by the present invention;

[0027] Figure 9 for Figure 8 The local enlarged view of point d in the middle;

[0028] Figure 10 for Figure 8 A partial enlarged view of point e in the middle;

[0029] Figure 11 A structural diagram of the screening material assembly provided by the present invention;

[0030] Figure 12 A half-section view of the screening material assembly provided by the present invention;

[0031] Figure 13 for Figure 12 The local enlarged view at point f in the middle;

[0032] Figure 14 A structural diagram of the slide provided by the present invention;

[0033] Figure 15 A structural diagram of the rotating drum provided by the present invention;

[0034] Figure 16 The structure of the sliding shaft provided by the present invention Figure 1 ;

[0035] Figure 17 The structure of the sliding shaft provided by the present invention Figure 2 ;

[0036] Figure 18 A diagram showing the connection structure of the bracket and the vibration reduction assembly provided by the present invention;

[0037] Figure 19 for Figure 18 A local enlarged view of point a in the middle;

[0038] Figure 20 A structural diagram of the cleaning component provided by the present invention;

[0039] Icons: 1-box, 11-chute, 12-box one, 13-box two, 14-box three, 2-cover, 21-feed hopper, 22-feed channel, 23-drainage port, 3-bracket, 31-vibration damping assembly, 311-fixed rod, 312-connecting block, 313-chassis, 314-pressing block, 315-pressing rod, 316-fixed block, 317-spring three, 4-vibrating screen assembly, 4a-avoidance cavity, 41-frame, 42-bottom plate, 43-hole one, 44-connecting part, 45-hole two, 46-buffer steel rod, 47-discharge port one, 48-discharge port two, 49-screen, 5-connecting assembly, 51-connecting rod, 511-adjusting nut, 52-spring one, 53-spring two, 54-slide cylinder, 541-hole three, 542-protrusion, 543-slide hole, 55-rotating cylinder, 551-hole four, 56-slide rod, 57-connecting shaft, 6-mounting frame, 61-vibration motor, 62-support arm, 7-rotating motor, 71-bearing seat, 72-rotating shaft, 8-slider, 81-sliding shaft, 82-avoidance groove, 9-cleaning assembly, 91-mounting cylinder, 92-mounting hole, 93-mounting block, 94-elastic strip, 95-spring four. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 4 As shown, a coal screening device for thermal power generation includes a housing 1 and vibrating screen assemblies 4. Two sets of vibrating screen assemblies 4 are provided, hinged to each other at the center to form an "X" shape. The upper ends of the two vibrating screen assemblies 4 are fixedly connected to the housing 1 via a plurality of vibration-damping assemblies 31. The two ends of the two vibrating screen assemblies 4 are connected and supported by connecting assemblies 5, thereby connecting the two vibrating screen assemblies 4 into a whole. The bottom ends of the vibrating screen assemblies 4 are suspended in the air, that is, they are a certain distance away from the bottom end of the housing 1.

[0044] like Figure 1-3As shown, a conical cover body 2 is provided at the upper end of the box body 1, a feed hopper 21 is provided at the upper end of the cover body 2, two feed channels 22 are symmetrically provided inside the cover body 2, the upper end of the feed channel 22 is connected to the feed hopper 21, the lower end of the feed channel 22 is arranged opposite to the vibrating screen assembly 4, and a drainage port 23 is provided at the bottom end of the cover body 2, the drainage port 23 is opposite to the bottom end of the feed channel 22, and is used to drain the material vertically and reach the vibrating screen assembly 4 below.

[0045] like Figure 1-3 As shown, a slide groove 11 is provided on both sides of the box body 1, and a bearing seat 71 is fixed on the outer wall of the box body 1 outside the slide groove 11. A rotating shaft 72 is provided in the bearing seat 71, and the rotating shaft 72 is passed through the inside of the slide groove 11; a rotating motor 7 is fixed on the outside of one of the bearing seats 71, and the rotating motor 7 and the rotating shaft 72 are connected for transmission.

[0046] like Figure 3 As shown, the inner bottom end of the box body 1 is provided with material box 1 12, material box 2 13 and material box 3 14 from the middle to both sides. Material box 1 12 is provided in the middle for receiving bulk materials; material box 2 13 is provided on both sides of material box 1 12 for receiving fine particles and powder materials; material box 3 14 is provided on the outermost side for receiving medium-sized particle materials (qualified materials).

[0047] like Figure 8 、 Figure 10 as well as Figure 11-13 As shown, the vibrating screen assembly 4 includes a rectangular frame 41, a bottom plate 42 and a screen 49. Two bottom plates 42 are provided on both sides of the bottom end of the frame 41. The two bottom plates 42 are provided at a fixed distance, that is, there is a certain gap between the two bottom plates 42, and the gap is to avoid the cavity 4a. A hole 1 43 is provided in the middle position of the frame 41. The distance between the hole 1 43 and the bottom plates 42 on both sides is different, so that the material can be drained to the next layer of screen 49 after later installation; connecting parts 44 are extended from both ends of the frame 41, and hole 2 45 is provided in the connecting part 44; a number of buffer steel bars 46 are alternately provided on the upper side of the frame 41 to buffer the material and prevent the material from falling directly on the screen 49 and causing wear of the screen 49. A discharge port is provided at the bottom end of the frame 41, such as Figure 13 As shown, the upper and lower sides of the bottom end of the frame 41 are respectively provided with a discharge port 1 47 and a discharge port 2 48 .

[0048] like Figure 5-10 As shown, the installation structure of the vibrating screen assembly 4 is as follows:

[0049] Two screens 49 are provided on the frame 41 on the upper side of the bottom plate 42. The two screens 49 are provided between the first discharge port 47 and the second discharge port 48 (eg, Figure 9As shown), the material can be separated and discharged. The material on the upper side of the screen 49 is discharged through the second discharge port 48, and the material filtered and falling from the bottom of the screen 49 is discharged through the first discharge port 47. The two screens 49 are set at a fixed distance apart. The two vibrating screen assemblies 4 have a total of four screens 49. The diameters of the two screens 49 at the top are the same, and the diameters of the two screens 49 at the bottom are the same, and the diameter of the upper screen 49 is larger than the diameter of the lower screen 49; the two frames 41 are arranged inside and outside each other, and the holes 43 of the two frames 41 are arranged opposite each other, and a sliding shaft 81 is passed through the hole 43, that is, the two frames 41 pass through the two holes 43 respectively and are hinged on the two sliding shafts 81 (as shown in FIG. Figure 6 As shown in FIG, the frames 41 are hinged to form an X-shaped arrangement. The angles of the frames 41 are adjusted adaptively according to factors such as the material to be filtered and the particle size, and are generally preferably 5-10°.

[0050] like Figure 8 、 10 As shown, the vibrating screen assembly 4 is arranged in an "X" shape, and the four screens 49 leave a space in the center position without contacting each other. This position is used to install the sliding shaft 81 and the cleaning assembly 9.

[0051] like Figure 4 、 Figure 5 As shown, the upper ends of the two groups of vibrating screen assemblies 4 are fixedly connected to the box body 1 through a plurality of vibration reduction assemblies 31 .

[0052] like Figure 18 and Figure 19 As shown, specifically, the vibration reduction assembly 31 is fixed to the bottom end of the bracket 3, and the bracket 3 is fixed to the inner wall of the box body 1; the vibration reduction assembly 31 includes a fixed rod 311, a chassis 313 and a pressure block 314, and the chassis 313 is evenly distributed around the circumference of a plurality of connecting blocks 312 fixedly connected to the fixed rod 311, and the fixed rod 311 is fixed to the bottom end of the bracket 3; a pressure rod 315 is extended from the bottom end of the pressure block 314, and the pressure rod 315 is arranged through the inner hole of the chassis 313, and a spring three 317 is sleeved on the pressure rod 315 between the chassis 313 and the pressure block 314, and a fixed block 316 is provided at the bottom end of the pressure rod 315.

[0053] like Figure 4 、 Figure 5 As shown, connecting parts 44 are extended from both ends of the frame 41, and the connecting parts 44 at both ends of the two vibrating screen assemblies 4 are connected through a connecting assembly 5. The two vibrating screen assemblies 4 are connected into one through the connecting assembly 5 to avoid the relative angle between the two vibrating screen assemblies 4 changing during the vibration of the vibrating screen assemblies 4.

[0054] like Figure 4 、 Figure 5As shown, the lower ends of the two vibrating screen assemblies 4 are connected to a mounting frame 6, and a vibration motor 61 is provided on the mounting frame 6. The vibration motor 61 is used to provide vertical vibration, so that the vibrating screen assembly 4 as a whole vibrates up and down in the vertical direction to screen the material.

[0055] like Figure 3 、 Figure 4 、 Figure 16 and 17 As shown, a slider 8 is extended on one side of the sliding shaft 81, and a through avoidance groove 82 is provided inside the sliding shaft 81 and the slider 8. The height of the avoidance groove 82 is approximately twice the maximum amplitude of the vibrating screening assembly. The slider 8 is slidably set in the chute 11, and the entire screening assembly 4 is limited by the slider 8 so that it is only allowed to vibrate in the vertical direction. When the vibration motor 61 drives the vibrating screening assembly 4 to vibrate up and down in the vertical direction, it can drive the sliding shaft 81 and the slider 8 as a whole to move up and down along the chute 11; and the rotating shaft 72 is set inside the avoidance groove 82. The rotating shaft 72 is fixed on the bearing seat 71 and the upper and lower height positions are fixed. Therefore, when the sliding shaft 81 and the slider 8 slide up and down and the height position changes, due to the existence of the internal avoidance groove 82, there will be no interference with the rotating shaft 72. It can ensure that while the vibrating screening assembly 4 is vibrating and screening, the rotating shaft 72 is in a working state of rotating to clean the screen 49, thereby performing vibration cleaning of the screen 49 online and improving screening efficiency.

[0056] like Figure 2-6 、 Figure 8 and Figure 10 As shown, the rotating shaft 72 is arranged inside the avoidance groove 82, and several cleaning components 9 are arranged on the rotating shaft 72. The cleaning components 9 are arranged in the space between the four screens 49. The cleaning components 9 can rotate to contact the four screens 49 to vibrate and clean the screens 49.

[0057] like Figure 20As shown, specifically, the cleaning assembly 9 includes a mounting cylinder 91 and an elastic strip 94. The elastic strip 94 can be made of a material with a certain toughness and elastic deformation, such as a silicone material or a material similar to a steel strip. Of course, the elastic strip 94 can also be set as a double layer, with an inner layer of an elastic steel strip and an outer layer of silicone, which has properties such as toughness and elasticity. The mounting cylinder 91 is provided with a mounting hole 92, and the mounting cylinder 91 is mounted on the rotating shaft 72 through the mounting hole 92. The outer wall of the mounting cylinder 91 is provided with a plurality of mounting blocks 93. The elastic strip 94 is hinged in the connecting holes of the mounting blocks 93, and two adjacent elastic strips 94 are connected by springs 95. When the rotary motor 7 is started (alternating forward and reverse rotation), the rotating shaft 72 drives the four elastic strips 94 to rotate, slapping the four screens 49 to perform vibration cleaning and prevent the screens 49 from being blocked. The presence of spring 4 95 can always maintain the relative position of elastic strip 94. When elastic strip 94 contacts screen 49, spring 4 95 can undergo a certain deformation to achieve a softer contact between elastic strip 94 and screen 49. After the elastic strip 94 leaves screen 49, it can quickly reset. Screen assembly 4 is arranged in an "X" shape, and cleaning assembly 9 is provided in the space between the four screens 49. It can simultaneously vibrate and clean the four screens 49 while vibrating and screening, effectively preventing clogging of the screens 49 and further improving screening efficiency.

[0058] like Figure 4 As shown, after the vibrating screen assembly 4, the vibration reduction assembly 31, the bracket 3, and the mounting frame 6 are assembled as a whole and set inside the box body 1, the buffer steel rod 46 is set opposite the drainage port 23, the discharge port 1 47 is set opposite the material box 2 13, and the discharge port 2 48 is set opposite the material box 3 14.

[0059] like Figure 10 The arrows in the figure show the flow direction of the screened material. When the material falls on the two upper screens 49, the filtered bulk material flows along the upper screen 49, falls through the gap between the two upper screens 49, and is collected in the first bin 12. The material filtered by the two upper screens 49 falls through the gaps in the two upper bottom plates 42 to the two lower screens 49. After further screening by the two lower screens 49, it is discharged from the first discharge port 47 and the second discharge port 48, respectively. The material discharged from the first discharge port 47 is collected in the second bin 13, and the material discharged from the second discharge port 48 is collected in the third bin 14. The distance between the first hole 43 and the two bottom plates 42 is inconsistent. In this way, after the two screen assemblies 4 are hingedly installed, the material screened by the upper screen 49 can be dropped through the gap at the bottom end of the bottom plate 42 onto the lower screen 49, thereby achieving multi-level flow screening of the material.

[0060] The maximum drop of screen 49 during vertical vibration of vibration motor 61 depends on the amplitude and frequency of vibration motor 61, as well as the design and installation of screen assembly 4. Typically, the amplitude of vibration motor 61 is between 1 and 6 mm, and the frequency is typically between 750 and 1500 rpm. The maximum drop of screen 49 can be calculated based on the amplitude and frequency, i.e., the maximum displacement of screen 49 during vertical vibration.

[0061] For example, if the amplitude of the vibration motor 61 is 3 mm and the vibration frequency is 1000 rpm, the maximum height difference of the screen 49 up and down is 6 mm (twice the amplitude).

[0062] In the present invention, when the vibration motor 61 is started and the entire vibrating screen assembly 4 vibrates up and down in the vertical direction, the sliding shaft 81 and the slider 8 are driven to move up and down along the slide groove 11. Due to the presence of the avoidance groove 82, there will be no interference with the rotating shaft 72, so that when the vibrating screen assembly 4 is working, the cleaning assembly 9 can be controlled to rotate to realize online cleaning of the screen 49; and, since the vibrating screen assembly 4 moves up and down as a whole, the four screens 49 are driven to move up and down, that is, the screens 49 are moving, and the distance between the four screens 49 and the cleaning assembly 9 changes periodically, then the contact force between the screen 49 and the elastic strip 94 also changes periodically. The periodic up and down vibration of the screen assembly 49 and the forward and reverse rotational movement of the cleaning assembly 9 interact with each other, and act on the screen 49 through the constantly changing contact force, thereby further enhancing the vibration cleaning effect of the screen 49, effectively preventing the screen 49 from being blocked, greatly reducing the blockage of the screen 49, and improving the screening efficiency.

[0063] Example 2

[0064] In this embodiment, the connecting assembly 5 uses a rigid connection to securely connect the connecting portions 44 at both ends of the vibrating screen assembly 4. In other words, the connecting assembly 5 completely secures the two vibrating screen assemblies 4 together. In this case, the fixing block 316 of the vibration damping assembly 31 is fixedly connected to the connecting portion 44 of the upper vibrating screen assembly 4. With this method, the angles of the two vibrating screen assemblies 4 are fixed and cannot be adjusted.

[0065] Example 3

[0066] In this embodiment, the connecting assembly 5 uses a soft connection to fix the connecting parts 44 at both ends of the vibrating screen assembly 4; that is, the two vibrating screen assemblies 4 are connected at both ends using an elastic connection to facilitate the adjustment of the angle of the screen assembly 4.

[0067] like Figure 4-10 、 Figure 14 and Figure 15As shown, the connecting assembly 5 includes a connecting rod 51, a spring 1 52, a spring 2 53, a slide 54, a rotating cylinder 55 and a connecting shaft 57. The connecting shaft 57 is hinged in the hole 2 45 on the two connecting parts 44 on the same side. The rotating cylinder 55 is rotatably set on the connecting shaft 57 through the hole 3 541. Two rotating cylinders 55 are symmetrically set on one connecting shaft 57, and a number of slide rods 56 are set on the upper and lower sides of the rotating cylinder 55; two slide cylinders 54 are slidably set on the connecting rod 51, and a number of protrusions 542 are symmetrically set on the slide cylinder 54. The protrusion 542 is provided with a sliding hole 543, and the slide rod 56 is slidably set in the sliding hole 543. Adjustment nuts 511 are threadedly connected at both ends of the connecting rod 51. A second spring 53 is tightly mounted on the adjusting nut 511. The second spring 53 is tightly mounted against the end surface of the slide 54. A first spring 52 is sleeved on the connecting rod 51 between the two slides 54. The two ends of the first spring 52 are tightly mounted against the end surfaces of the slide 54. The various parameters of the first spring 52 and the second spring 53 are set according to specific circumstances. During installation, the positions of the two adjustment nuts 511 on the connecting rod 51 are rotated to compress the first spring 52 and the second spring 53, thereby adjusting the relative distance between the two slides 54 and achieving different angle adjustments of the two vibrating screen assemblies 4 to meet different angle requirements.

[0068] Under the action of the vibration motor 61, the entire vibrating screening system will vibrate, including the vibrating screen assembly 4 and the connecting assembly 5 connecting them. During the vibration process, due to the action of the vibration force, the spring 1 52 and the spring 2 53 of the connecting assembly 5 may be slightly compressed, and the angle between the two vibrating screen assemblies 4 may change slightly. However, this angle change is usually very small and has little effect on the screening effect. On the contrary, the use of this flexible connection can reduce the overall tension of the screen assembly 4 compared to a rigid connection, thereby extending its service life.

[0069] In the present invention, the two vibrating screen assemblies 4 are elastically connected. By designing the connecting assembly 5, under the premise of facilitating angle adjustment, the elastic restoring force of the spring is ensured to resist the effect of the vibration force through spring 1 52 and spring 2 53. However, in order to ensure that the angle between the screens 49 remains stable and does not change beyond the allowable range, the spring coefficients of spring 1 52 and spring 2 53 must be large enough to avoid large angle changes between the two vibrating screen assemblies 4 during use, so as to keep the angle between the screens 49 stable, thereby ensuring the normal operation and screening effect of the vibrating screening system. In other words, this elastic connection structure is convenient for adjusting the angle of the vibrating screen assembly 4, and can also avoid excessive changes in the angle of the two vibrating screen assemblies 4 during vibrating screening. This connection method can better adapt to the screening needs of different materials.

[0070] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A coal screening device for thermal power generation, comprising a box and a vibrating screen assembly, characterized in that : The vibrating screen assembly includes a frame, a bottom plate and a screen. Two bottom plates are provided on both sides of the bottom end of the frame, and the two bottom plates are provided at a fixed distance. Two screens are provided on the frame above the bottom plate, and the two screens are provided at a fixed distance. The vibrating screen assembly is provided in two groups, and the two groups of vibrating screen assemblies are respectively hinged on two sliding shafts and arranged in an "X" shape. The upper ends of the two groups of vibrating screen assemblies are fixedly connected to the box body through a plurality of vibration reduction assemblies; connecting parts are extended at both ends of the frame, and the connecting parts at both ends of the two groups of vibrating screen assemblies are connected by connecting assemblies; Slide grooves are provided on both sides of the box body, a slider is extended from one side of the sliding shaft, and the slider is slidably provided in the slide grooves; a through avoidance groove is provided inside the sliding shaft and the slider; A bearing seat is provided on the box body outside the chute, and a rotating shaft connected to the rotating motor is provided in the bearing seat. The rotating shaft is provided inside the avoidance groove, and a plurality of cleaning components are provided on the rotating shaft. The cleaning components are provided in the space between the four screens, and the cleaning components can rotate to contact the four screens; The upper end of the box is provided with a conical cover, the upper end of the cover is provided with a feed hopper, and two feed flow channels are symmetrically provided inside the cover, the upper end of the feed flow channel is connected to the feed hopper, and the lower end of the feed flow channel is provided opposite to the vibrating screen assembly; The distances between the sliding shaft and the bottom plates on both sides are different, so that the material can be guided to the next layer of screen.

2. The coal screening device for thermal power generation according to claim 1, characterized in that: The connecting assembly uses a hard connection method to fix the connecting parts at both ends of the vibrating screen assembly.

3. The coal screening device for thermal power generation according to claim 1, characterized in that: The connecting assembly adopts a soft connection method to fix the connecting parts at both ends of the vibrating screen assembly; the connecting assembly includes a connecting rod, a spring 1, a spring 2, a slide cylinder, a rotating cylinder and a connecting shaft, and the two connecting parts on the same side are hinged with a connecting shaft, and a rotating cylinder is rotatably provided on both sides of the connecting shaft, and a number of sliding rods are provided on the upper and lower sides of the rotating cylinder; two slide cylinders are slidably provided on the connecting rod, and a number of protrusions are respectively provided on both sides of the slide cylinder, and sliding holes are provided in the protrusions, and the slide rods are slidably provided in the sliding holes; the two ends of the connecting rod are respectively threadedly connected with adjusting nuts, and a spring 2 is tightly provided on the adjusting nut, and the spring 2 is arranged tightly against the end face of the slide cylinder, and a spring 1 is sleeved on the connecting rod between the two slide cylinders, and the two ends of the spring 1 are respectively tightly provided against the end face of the slide cylinder.

4. The coal screening device for thermal power generation according to claim 1, characterized in that: The vibration damping assembly is fixed to the bottom end of the bracket, and the bracket is fixed to the inner wall of the box; the vibration damping assembly includes a fixed rod, a chassis and a pressure block, and the chassis is evenly distributed around the circumference with a number of connecting blocks fixedly connected to the fixed rod, and the fixed rod is fixed to the bottom end of the bracket; a pressure rod is extended from the bottom end of the pressure block, and the pressure rod is arranged through the inner hole of the chassis, and a spring three is sleeved on the pressure rod between the chassis and the pressure block, and a fixed block is provided at the bottom end of the pressure rod.

5. The coal screening device for thermal power generation according to claim 1, characterized in that: A plurality of buffer steel bars are arranged alternately on the frame on the upper side of the screen.

6. The coal screening device for thermal power generation according to claim 5, characterized in that: The lower end of the feed flow channel is arranged opposite to the buffer steel rod.

7. The coal screening device for thermal power generation according to claim 1, characterized in that: The lower end of the vibrating screen assembly is connected to a mounting frame, and a vibrating motor is provided on the mounting frame.

8. The coal screening device for thermal power generation according to claim 1, characterized in that: The cleaning assembly includes a mounting tube and a plurality of elastic strips hinged around the mounting tube, and two adjacent elastic strips are connected by a spring four.

9. The coal screening device for thermal power generation according to claim 1, characterized in that: A first discharge port and a second discharge port are respectively provided at the bottom end of the frame and on the upper and lower sides of the screen.

10. The coal screening device for thermal power generation according to claim 9, characterized in that: The bottom inner side of the box body is provided with material box one, material box two and material box three from the middle to both sides respectively. Material box one is arranged opposite to the cleaning component, material box two is arranged opposite to the discharge port one, and material box three is arranged opposite to the discharge port two.

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