Super large vibrating screen and amplitude calculation method

Abstract

The present invention relates to the technical field of screening equipment, and discloses a super-large vibrating screen and an amplitude calculation method, wherein the vibrating screen comprises a screen body, a plurality of driving mechanisms, and a plurality of excitation mechanisms; the excitation mechanism comprises a first excitation component and a second excitation component spaced along the first direction; the driving mechanism has two symmetrically arranged output ends, the first excitation component comprises a first excitation unit, the first excitation unit comprises a first rotating shaft and two first swing hammers; the second excitation component comprises a second excitation unit, the second excitation unit comprises a second rotating shaft and two second swing hammers; a certain angle is formed between the central axis of the first swing hammer and the second swing hammer. The beneficial effects of the present invention are as follows: the exciter generates an elliptical excitation force, which can prevent material jamming, reduce the weight of the entire screen body, reduce the distance and the switching structure between the exciter and the screen, improve the efficient conduction of the excitation force, increase the amplitude, and achieve good screening effect.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, in particular to an ultra-large vibrating screen and an amplitude calculation method. Background Art

[0002] In the prior art, the driving mechanism of the linear vibrating screen is generally installed above or on one side of the screen body through a crossbeam, and the driving mechanism is connected to the vibrator of the screen body. In this installation method, the vibrator transmits the vibration to the screen body through the crossbeam. The vibration is easily lost during the transmission process, and the vibration transmission efficiency is reduced. Moreover, it is easy to cause the amplitude of the screen body close to the crossbeam and the area far from the crossbeam to be different, thereby affecting the screening efficiency. In addition, the mass of the swing hammers at various locations of the existing linear screen vibrator is the same, and the vibrator generates a linear exciting force. The granular material is easily stuck in the screen, resulting in easy material stacking at the discharge end.

[0003] In addition, the existing circular vibrating screen has a driving mechanism located on one side of the screen body, the screen body is subjected to force on one side, and the transmission shaft of the driving mechanism is too long. The vibrators located on both sides of the screen body are not easy to synchronize, and torsional vibration is prone to occur.

[0004] Moreover, the linear vibrating screen and the circular vibrating screen in the prior art are limited by the size of the structural design, and their single amplitude is generally less than 6 mm, resulting in poor screening effect. Summary of the invention

[0005] The purpose of the present invention is to provide an ultra-large vibrating screen and an amplitude calculation method. Compared with the linear vibrating screen in the prior art, the distance between the exciter and the screen and the transfer structure are reduced, the efficient conduction of the exciting force is improved, and the vibration transmission efficiency is improved. At the same time, the weight of the screen body is reduced and an elliptical exciting force is provided, which can prevent the particulate material from getting stuck and clogging the screen hole, which helps the large particulate material to move forward smoothly and also facilitates the small particulate material to pass through the screen hole, thereby improving the screening efficiency. Compared with the circular vibrating screen in the prior art, the driving mechanism is located in the middle of the screen body, so that the two sides of the screen body are evenly stressed, avoiding torsional vibration caused by the single-sided force of the screen body, simplifying the structure of the vibrating screen, thereby increasing the amplitude and achieving a good screening effect.

[0006] In order to achieve the above object, the present invention provides an ultra-large vibrating screen, comprising a screen body, a plurality of driving mechanisms, and a plurality of excitation mechanisms, wherein a feed port is provided at one end of the screen body, and a discharge port is provided at the other end;

[0007] A frame is provided in the middle of the sieve body above the sieve mesh, and a plurality of driving mechanisms are arranged on the frame at intervals along a first direction, and a center line of the driving mechanism coincides with a center line of the frame;

[0008] The excitation mechanism comprises a first excitation component and a second excitation component which are spaced apart along the first direction, the first excitation component being arranged close to the feed port, and the second excitation component being arranged close to the discharge port; the driving mechanism has two symmetrically arranged output ends, the first excitation component comprises a first excitation unit which is symmetrically arranged at two output ends of the driving mechanism, the first excitation unit comprises a first rotating shaft and two first swinging hammers, bearing seats are arranged on both sides of the screen body, the first rotating shaft is rotatably connected to the bearing seats, two first swinging hammers are sleeved on the first rotating shaft, one end of the first rotating shaft is connected to the output end of the driving mechanism, and the two first swinging hammers are respectively located on both sides of the bearing seats;

[0009] The second excitation assembly includes a second excitation unit symmetrically arranged at two output ends of the other driving mechanism, the second excitation unit includes a second rotating shaft and two second swinging hammers, the second rotating shaft is rotatably connected to the bearing seat plate, the second rotating shaft is sleeved with two second swinging hammers, one end of the second rotating shaft is connected to the output end of the driving mechanism, and the two second swinging hammers are respectively located on both sides of the bearing seat plate;

[0010] The first swing hammer and the second swing hammer rotate synchronously in opposite directions, the weight of the second swing hammer is greater than the weight of the first swing hammer, and in an initial state, a central axis of the first swing hammer and a central axis of the second swing hammer form a certain angle.

[0011] Furthermore, the first excitation unit and the second excitation unit have the same structure, and the first excitation unit also includes a first bearing and a seal mounted on the first rotating shaft, the first bearing is embedded in the bearing seat plate, and the first bearing is mounted on the first rotating shaft, the seal includes an oil flinger, an oil seal and a wear-resistant ring sequentially mounted on the first rotating shaft, the oil flinger is arranged in contact with the side wall of the bearing, the side wall of the wear-resistant ring is arranged in contact with the first swing hammer, and the end of the first rotating shaft is also provided with a stopper for limiting the axial movement of the first swing hammer.

[0012] Furthermore, the driving mechanism includes a dual-axis motor, a first synchronous wheel, a transmission shaft, a second synchronous wheel, an elastic connecting member and a shock-absorbing support. There are multiple shock-absorbing supports and they are arranged at intervals on the frame along the third direction. The transmission shaft is passed through the shock-absorbing support, and the second synchronous wheel is fixed to one end of the transmission shaft, and the elastic connecting member is fixed to the other end. The other end of the elastic connecting member is fixedly connected to the first rotating shaft or the second rotating shaft. The output end of the dual-axis motor is provided with the first synchronous wheel, and a synchronous belt is connected between the first synchronous wheel and the second synchronous wheel. When the dual-axis motor works, it drives the transmission shaft to rotate, and then drives the first rotating shaft or the second rotating shaft to rotate.

[0013] Furthermore, the shock-absorbing support includes a coaxially arranged base, a first shock-absorbing ring, a second shock-absorbing ring, and a support bearing, the base is sequentially embedded with the first shock-absorbing ring, the second shock-absorbing ring and the support bearing in a radially inward direction, the first shock-absorbing ring is hollow inside and an annular oil circuit is provided, the outer wall of the first shock-absorbing ring is provided with an oil inlet, the outer wall of the second shock-absorbing ring is radially extended outward and provided with a sealing piston, the outer sleeve of the sealing piston is provided with a spring, the spring has a tendency to push the sealing piston to move radially inward along the second shock-absorbing ring, the inner side wall of the first shock-absorbing ring is provided with a sealing groove corresponding to the sealing piston, the sealing groove is provided with an oil hole connected with the annular oil circuit, the end face of the sealing piston is provided with an oil inlet channel connected with the oil inlet hole on the support bearing, which is used to introduce the oil in the annular oil circuit into the support bearing, and the support bearing is also provided with a sealable oil outlet hole.

[0014] Furthermore, a second connecting tube is provided between the second damping ring and the supporting bearing, one end of the second connecting tube is embedded in the oil inlet passage, and the other end is embedded in the oil inlet hole.

[0015] Furthermore, the elastic connecting member includes a first elastic connecting ring, a second elastic connecting ring, a connecting shaft, and a first connecting tube. The two ends of the connecting shaft are respectively fixed to the first elastic connecting ring and the second elastic connecting ring. The other end of the first elastic connecting ring is fixed to the first connecting tube, and the first connecting tube is sleeved on the end of the transmission shaft; the other end of the second elastic connecting ring is fixed to the first rotating shaft or the second rotating shaft.

[0016] Furthermore, a fixing plate for the driving mechanism is provided on the frame, and an adjusting component for adjusting the installation height of the driving mechanism is provided above the fixing plate.

[0017] Furthermore, the adjustment assembly includes support screws vertically arranged at the four corners of the fixing plate, the support screws are connected to the base of the driving mechanism, and two locking nuts are sleeved on the support screws, and the two locking nuts are respectively located on the upper and lower sides of the base.

[0018] Furthermore, the angle ranges from 30° to 60°.

[0019] The present invention also provides a method for calculating the amplitude of a super-large vibrating screen, based on the super-large vibrating screen described in any one of the above, comprising the steps of:

[0020] S1, calculating the phase difference angle between the rotation axes of the first swing hammer and the second swing hammer;

[0021] S2, calculating the exciting force of the vibrating screen in the first direction and the second direction, and the exciting moment of the vibrating screen at the center of mass;

[0022] S3, calculating the first amplitude of the vibrating screen in the first direction , a second amplitude in a second direction ;

[0023] S4. Calculate single amplitude .

[0024] Compared with the prior art, the super-large vibrating screen and amplitude calculation method of the embodiment of the present invention have the following beneficial effects: a frame is provided in the middle of the screen body, and multiple driving mechanisms are fixed on the frame, so that the amplitude distribution on the screen body is more uniform, thereby improving the screening effect. The center line of the driving mechanism coincides with the center line of the frame, and the driving mechanism is centrally arranged, and a single driving mechanism can drive two groups of first excitation units, which can reduce the size of the transmission shaft of the driving mechanism, synchronize the first excitation units on both sides of the screen body, and avoid torsional vibration of the screen body under unilateral force; in addition, the first excitation component and the second excitation component are connected to the screen body through the bearing seat plate to realize vibration transmission, thereby improving the vibration transmission efficiency; in addition, when the total mass of the vibrating screen swing hammer is constant, the mass of the second swing hammer is adjusted to be greater than the mass of the first swing hammer, which can generate an elliptical trajectory exciting force, avoid material jamming and clogging the screen hole, help large particle materials to move forward smoothly, and also facilitate small particle materials to pass through the screen hole, and the second swing hammer is arranged close to the discharge end, thereby providing a larger amplitude, avoiding material stacking at the discharge end. In addition, under the condition that the total mass of the vibrating screen hammer is constant, since the vibrating screen of the present invention can provide a larger amplitude, the vibrating screen structure can be changed on this basis to reduce the mass of the screen body, break through the design size limitations of the existing vibrating screen, increase the screening area of ​​the vibrating screen, and improve the material processing capacity of the vibrating screen while increasing the amplitude; the vibrating screen of the present invention can provide a larger single amplitude and has a good screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the ultra-large vibrating screen embodiment of the present invention;

[0026] Figure 2 Is a schematic diagram of the structure of the drive mechanism of the ultra-large vibrating screen embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the excitation mechanism of the super-large vibrating screen embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the assembly of the drive mechanism of the ultra-large vibrating screen embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the first excitation unit of the super-large vibrating screen embodiment of the present invention;

[0030] Figure 6 A cross-sectional view of a shock-absorbing support of an ultra-large vibrating screen according to an embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the shock-absorbing support of the super-large vibrating screen according to the embodiment of the present invention;

[0032] Figure 8 is a vibration analysis diagram of a super-large vibrating screen according to an embodiment of the present invention;

[0033] Fig. 9 It is a material trajectory analysis diagram of a super-large vibrating screen according to an embodiment of the present invention;

[0034] Fig.10 is a diagram showing changes in the amplitude of a super-large vibrating screen according to an embodiment of the present invention;

[0035] Fig.11 This is a material performance parameter table of the super-large vibrating screen according to an embodiment of the present invention;

[0036] Fig.12 : is a safety factor distribution diagram of a super-large vibrating screen according to an embodiment of the present invention;

[0037] Fig.13 is a stress distribution diagram of a super-large vibrating screen according to an embodiment of the present invention;

[0038] Fig.14 It is an equivalent displacement distribution diagram of the super-large vibrating screen according to an embodiment of the present invention.

[0039] In the figure, 1, screen body; 2, driving mechanism; 21, double-axis motor; 22, first synchronous wheel; 23, transmission shaft; 24, second synchronous wheel; 25, elastic connecting member; 251, first elastic connecting ring; 252, second elastic connecting ring; 253, connecting shaft; 254, first connecting pipe; 26, shock-absorbing support; 261, base; 262, first shock-absorbing ring; 263, second shock-absorbing ring; 264, supporting bearing; 2621, annular oil circuit; 2622, oil inlet; 2624, oil hole; 2631, sealing piston; 2632, spring; 2623, sealing groove; 27, oil inlet channel; 28, second connecting pipe; 3, excitation mechanism; 4, feed inlet ;5. Discharge port;6. Frame;61. Fixed plate;62. Adjustment assembly;621. Support screw;622. Locking nut;7. First vibration assembly;71. First vibration unit;711. First rotating shaft;712. First swing hammer;713. First bearing;714. Seal;7141. Oil ring;7142. Oil seal;7143. Wear ring;7144. Stopper;8. Second vibration assembly;82. Second vibration unit;821. Second rotating shaft;822. Second swing hammer;9. Bearing seat plate;91. Side plate;92. Connecting ring;93. First cover body;94. Second cover body;X, first direction;Y, second direction;Z, third direction. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or positional relationship are based on the positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices and elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In the description of the present invention, it should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0043] like Figure 1As shown, the ultra-large vibrating screen of the preferred embodiment of the present invention is used for screening particulate materials, and comprises a screen body 1, a plurality of driving mechanisms 2, and a plurality of exciting mechanisms 3. A feed port 4 is provided at one end of the screen body 1, and a discharge port 5 is provided at the other end. Figure 1 As shown, during use, the screen body 1 is set at a certain inclination angle with the equipment placement plane. In this embodiment, the inclination angle of the screen body 1 is less than or equal to 3°, that is, the upper end of the screen body 1 is the feed port 4, and the lower end is the discharge port 5. For the convenience of description, refer to Figure 1 , Figure 8 , the length direction of the inclined screen body 1 is defined as the first direction X, and the direction perpendicular to the screen surface is defined as the second direction Y, wherein the first direction X and the second direction Y are perpendicular to each other, and the width direction of the screen body 1 is the third direction Z. In order to avoid unilateral force on the screen body 1 when installing the drive mechanism 2 and to simplify the structure, a frame 6 is provided in the middle of the screen body 1 above the screen mesh, and a plurality of drive mechanisms 2 are arranged on the frame 6 at intervals along the first direction X. In order to center the drive mechanism 2, the drive mechanism 2 is located on the median plane of the screen body 1 vertically arranged along the second direction Y. Specifically, the center line of the drive mechanism 2 coincides with the center line of the frame 6, the drive mechanism 2 is centered, and a single drive mechanism 2 can drive two groups of first excitation units 71, the size of the transmission shaft 23 of the drive mechanism 2 can be reduced, and the first excitation units 71 on both sides of the screen body 1 are synchronized to avoid unilateral force on the screen body 1 and torsional vibration.

[0044] Furthermore, the number of excitation mechanisms 3 can be adaptively set according to the length of the screen body 1. In the present embodiment, the number of excitation mechanisms 3 is 2 groups. Only one group of excitation mechanisms 3 is described below. The excitation mechanism 3 includes a first excitation component 7 and a second excitation component 8 spaced apart along a first direction X, wherein the first excitation component 7 is arranged close to the feed port 4, and the second excitation component 8 is arranged close to the discharge port 5. The driving mechanism 2 has two symmetrically arranged output ends, and the first excitation component 7 includes a first excitation unit 71 symmetrically arranged at the two output ends of a driving mechanism 2, that is, a single driving mechanism 2 can synchronously drive two first excitation units 71, so that the excitation units on both sides of the driving mechanism 2 can be kept synchronized while reducing the size of the output shaft of the driving mechanism 2. Furthermore, in order to reduce the weight of a single hammer, the first exciting unit 71 includes a first rotating shaft 711 and two first hammers 712. Bearing plates 9 are provided on both sides of the screen body 1. The first rotating shaft 711 and the bearing plate 9 are rotatably connected. Two first hammers 712 are sleeved on the first rotating shaft 711, and one end of the first rotating shaft 711 is connected to the output end of the driving mechanism 2. The two first hammers 712 are respectively located on both sides of the bearing plate 9. The corresponding single hammer in the single vibrator in the prior art is decomposed into two, which are respectively located on the inner and outer sides of the screen body 1, thereby reducing the weight of the single hammer and reducing the overall size of the vibrating screen.

[0045] To simplify the structure, the first excitation assembly 7 and the second excitation assembly 8 have the same structure. Similarly, the second excitation assembly 8 includes a second excitation unit 82 symmetrically arranged at two output ends of another driving mechanism 2. The second excitation unit 82 includes a second rotating shaft 821 and two second swing hammers 822. The second rotating shaft 821 is rotatably connected to the bearing seat plate 9, and two second swing hammers 822 are respectively arranged at both ends of the second rotating shaft 821. The two second swing hammers 822 are respectively located on both sides of the bearing seat plate 9, and one end of the second rotating shaft 821 is connected to the output end of the driving mechanism 2. To generate the excitation force, the second swing hammer 822 and the first swing hammer 712 rotate synchronously in opposite directions. Further, in order to provide an elliptical excitation force, the weight of the second swing hammer 822 is greater than the weight of the first swing hammer 712. In the initial state, the central axis of the second swing hammer 822 forms a certain angle with the central axis of the first swing hammer 712. The initial state is that the first swing hammer 712 and the second swing hammer 822 are assembled and are in a stationary state. In this embodiment, the adjustment range of the included angle is 30°-60°, preferably 45°, and the vibration direction angle of the screen to the particulate material can be adjusted by adjusting the size of the included angle.

[0046] In some embodiments, in order to facilitate the design of the excitation unit and the assembly of the vibrating screen, the first excitation unit 71 and the second excitation unit 82 have the same structure. Since the vibrating screen vibrates at a higher frequency, the first excitation unit 71 also includes a first bearing 713 and a seal 714 mounted on the first rotating shaft 711. In order to prevent the first rotating shaft 711 from getting stuck during rotation, lubricating oil needs to be added to the first bearing 713. In order to prevent the lubricating oil from leaking, a seal 714 is used to seal the connection between the first bearing 713 and the first rotating shaft 711. Since first swing hammers are provided at both ends of the first rotating shaft 711, in order to form a stable support, the number of first bearings 713 is 2. Therefore, both first bearings 713 need to be sealed, and the number of seals 714 is also two groups. Specifically, the seals 714 include an oil flinger 7141, an oil seal 7142 and a wear-resistant ring 7143, which are sequentially mounted on the first rotating shaft 711. The oil flinger 7141 is arranged to fit the side wall of the bearing, and the side wall of the wear-resistant ring 7143 is arranged to fit the first swing hammer. A stop block 7144 for limiting the axial movement of the first swing hammer is also provided at the end of the first rotating shaft 711.

[0047] Further, in some embodiments, in order to facilitate the installation and positioning of the first bearing 713, the bearing seat plate 9 includes a side plate 91, a connecting ring 92, a first cover body 93 and a second cover body 94, wherein the side plate 91 is vertically fixed on the screen body 1, a connecting ring 92 is inserted into the side plate 91, and the first bearing 713 is provided at both ends of the inner side of the connecting ring 92, and the first bearing 713 is sleeved on the first rotating shaft 711, and the first cover body 93 and the second cover body 94 are provided at both ends of the connecting ring 92 for shielding the first swing hammer or the second swing hammer. Furthermore, in order to facilitate the adjustment of the weight of the first swing hammer and the second swing hammer, fixing screw holes for fixing the load-bearing block are provided on the first swing hammer and the second swing hammer. In the prior art, when the first bearing 713 is set, the mounting hole of the first bearing 713 is generally opened directly on the side plate 91. At this time, the overall thickness of the side plate 91 needs to be thicker and the processing is more complicated. In the present embodiment, the connecting ring 92 is welded to the side plate 91, annealing is performed to eliminate welding stress, and then the overall processing is performed. The overall processing is simple and the production cost is reduced.

[0048] In some embodiments, in order to keep the two first excitation units 71 or the two second excitation units 82 rotating synchronously, a gear mechanism is often used for driving in the prior art, but the heat dissipation effect is poor. Therefore, in this embodiment, the driving mechanism 2 includes a dual-axis motor 21, a first synchronous wheel 22, a transmission shaft 23, a second synchronous wheel 24, an elastic connecting member 25 and a shock-absorbing support 26. In order to reduce the influence of the vibration of the vibrating screen itself on the working of the transmission shaft 23, the shock-absorbing support 26 is multiple and is spaced apart on the frame 6 along the third direction Z. The transmission shaft 23 is arranged on the shock-absorbing support 26, and a second synchronous wheel 24 is fixed to one end of the transmission shaft 23, and an elastic connecting member 25 is fixed to the other end, and the other end of the elastic connecting member 25 is fixedly connected to the first rotating shaft 711 or the second rotating shaft 821. The output end of the dual-axis motor 21 is provided with a first synchronous wheel 22, and a synchronous belt is connected between the first synchronous wheel 22 and the second synchronous wheel 24. In the present invention, the dual-axis motor 21 is used to drive the transmission shaft 23 to rotate, and then drive the first rotating shaft 711 or the second rotating shaft 821 to rotate, which is beneficial to heat dissipation.

[0049] Furthermore, in order to avoid a rigid connection between the driving mechanism 2 and the first excitation unit 71 or the second excitation unit 82, the elastic connecting member 25 includes a first elastic connecting ring 251, a second elastic connecting ring 252, a connecting shaft 253, and a first connecting tube 254. The two ends of the connecting shaft 253 are respectively fixed to the first elastic connecting ring 251 and the second elastic connecting ring 252. The other end of the first elastic connecting ring 251 is fixed with the first connecting tube 254. The first connecting tube 254 is sleeved on the end of the transmission shaft 23. The other end of the second elastic connecting ring 252 is fixed to the first rotating shaft 711 or the second rotating shaft 821.

[0050] Furthermore, since a synchronous belt is used for transmission in this embodiment, in order to adjust the tension of the synchronous belt, a fixing plate 61 for the driving mechanism 2 is provided on the frame 6, and an adjustment assembly 62 for adjusting the installation height of the driving mechanism 2 is provided above the fixing plate 61. Specifically, the adjustment assembly 62 includes support screws 621 vertically arranged at the four corners of the fixing plate 61, the support screws 621 are connected to the base of the driving mechanism 2, and two locking nuts 622 are sleeved on the support screws 621, and the two locking nuts 622 are respectively located at the upper and lower sides of the base. When the synchronous belt is loose, the locking nuts 622 located above the base are loosened, and the locking nuts 622 located below the base are tightened, so that the driving mechanism 2 is adjusted to move upward as a whole to tighten the synchronous belt. Conversely, the synchronous belt can be adjusted when it is too tight.

[0051] Since the vibration screen rotates at a high speed during operation, in order to reduce the influence of the vibration screen's own vibration on the rotation of the transmission shaft 23, in this embodiment, the shock-absorbing support 26 is designed for shock absorption. The number of the shock-absorbing support 26 is 2, and the ends of the transmission shaft 23 are provided with limiting steps for cooperating with the shock-absorbing support 26 to avoid axial displacement of the transmission shaft 23. Specifically, the shock-absorbing support 26 includes a coaxially arranged base 261, a first shock-absorbing ring 262, a second shock-absorbing ring 263, and a support bearing 264. 64, wherein the base 261 is sequentially embedded with a first damping ring 262, a second damping ring 263 and a supporting bearing 264 in the radial direction inwardly, an annular oil passage 2621 is hollowly provided inside the first damping ring 262, an oil inlet 2622 is provided on the outer wall of the first damping ring 262 for connecting with the oil filling port on the base 261, a sealing piston 2631 is provided on the outer wall of the second damping ring 263 extending radially outwardly, a spring 2632 is provided on the outer sleeve of the sealing piston 2631, and the spring 263 The sealing piston 2631 has a tendency to move radially inward along the second damping ring 263. The inner side wall of the first damping ring 262 is provided with a sealing groove 2623 corresponding to the sealing piston 2631. The sealing groove 2623 is provided with an oil hole 2624 connected with the annular oil passage 2621. In order to facilitate the addition of oil to the support bearing 264 for lubrication, an oil inlet channel 27 connected with the oil inlet hole on the support bearing 264 is provided on the end surface of the sealing piston 2631 for The oil in the annular oil circuit 2621 is introduced into the support bearing 264, and a sealable oil outlet hole is also provided on the support bearing 264. That is, when the transmission shaft 23 undergoes radial runout, the support bearing 264 drives the second shock-absorbing ring 263 to move radially, and continuously discharges and absorbs oil from the oil hole 2624. The oil passes through the oil outlet hole at an extremely fast speed, converting the absorbed mechanical energy into heat energy to achieve buffering. At the same time, the compression spring 2632 assists in buffering and shock absorption, and has a good shock-absorbing effect.

[0052] Furthermore, in order to facilitate the connection between the second shock-absorbing ring 263 and the support bearing 264, a second connecting pipe 28 is provided between the second shock-absorbing ring 263 and the support bearing 264, and one end of the second connecting pipe 28 is embedded in the oil inlet channel 27, and the other end is embedded in the oil inlet hole.

[0053] Since the overall weight of the vibrating screen is reduced in this embodiment, the super-large vibrating screen in the present invention can break through the size design limitation of the vibrating screen in the prior art, that is, the size of the vibrating screen in the present invention can be larger under the same weight of the vibrating screen, thereby increasing the screening area. At present, the largest width and length of the domestic vibrating screen is 5.5m*11m, while the size of the super-large vibrating screen in the present invention can reach 12m*24m. In the present invention, according to specific production requirements, in this embodiment, the size of the vibrating screen is 6m*12m, which greatly breaks through the size structure design limitation and greatly improves the screening efficiency.

[0054] The amplitude is closely related to the screening effect of the vibrating screen. The larger the amplitude, the more violent the movement of the material on the screen surface, the better the screening effect, and the material can be prevented from getting stuck. In the prior art, the single amplitude of the vibrating screen (usually refers to the maximum displacement of the vibration in a single direction) is limited by the overall structure of the vibrating screen, generally between 4mm and 6mm, and the amplitude is relatively small. The vibrating screen of the present invention can increase the single amplitude of the vibrating screen to more than 7mm, greatly improving the screening efficiency and avoiding material sticking. The force analysis of the vibrating screen is performed, and the single amplitude is calculated.

[0055] In the present invention, the weight of the first swing hammer 712 and the second swing hammer 822 is adjusted to change the single amplitude. Specifically, Figure 3 , Figure 5 As shown, the first swing hammer 712 and the second swing hammer 812 are T-shaped, and eccentric blocks (not shown in the figure) are detachably provided on both sides of the T-shaped structure by screws. A method for calculating the amplitude of a super-large vibrating screen is now provided. The vibration theory analysis of the vibrating screen is as follows: Figure 8 As shown, wherein O is the mass center of the vibrating screen, O1 is the rotation center of the first swing hammer, and O2 is the rotation axis of the second swing hammer, which includes the following steps:

[0056] S1, calculating the phase difference angle between the rotation axes of the first swing hammer and the second swing hammer;

[0057] S2. Calculate the exciting force of the vibrating screen in the first direction X and the second direction Y , , and the exciting moment of the vibrating screen at the center of mass O ;

[0058] S3, calculate the first amplitude of the vibrating screen in the first direction X , the second amplitude in the second direction Y ;

[0059] S4. Calculate the single amplitude of the vibrating screen .

[0060] The specific step S1 is:

[0061] When the vibrating screen drives the material to make a translational elliptical motion, there is the following equivalent relationship:

[0062]

[0063] in, is the vibration direction angle, which refers to the angle between the vibration direction of the screen surface and the horizontal plane. In the present invention, ; is the angle between the output axis of the driving mechanism 2 and the horizontal plane where the fixing plate 61 is located, given ; Substitute into the above formula and calculate =46°.

[0064] Mechanical analysis of the vibrating screen shows that step S2 is specifically as follows:

[0065]

[0066] Formula (1)

[0067] +

[0068] in, , , The unit is ; is the overall mass of the first swing hammer and the eccentric block on the first swing hammer, is the total mass of the second swing weight and the eccentric block on the second swing weight, in kg; is the eccentricity of the first swing hammer, is the eccentricity of the second swing hammer, is the rotation frequency, in units of ; ; ; ; ;The unit is mm.

[0069] In order to analyze the amplitude of the vibrating screen, an amplitude detection test is set up to monitor the vibration of the screen head, screen body and screen tail when the vibrating screen moves empty. The center of mass O of the screen body is affected by the forces in the X and Y directions. The motion trajectory of the center of mass O of the screen body in a single cycle is as follows: Fig. 9As shown, it can be seen that the vibrating screen provides an elliptical exciting force during the vibration process. Among them, the peak amplitude curve of the mass center O in the X and Y directions is a sine or cosine function graph. Since there is a phase difference between the mass center O in the X and Y directions, refer to Fig.10 (a) Fig.10 (b) When the amplitude in the X direction When the maximum value is reached, It is not possible to reach the maximum value.

[0070] Kinematic analysis of the vibrating screen can be obtained according to Newton's second law:

[0071]

[0072] 𝑀𝑦̈ Formula (2)

[0073] in, , 𝑦̈ is the acceleration of the center of mass O in the first direction X and the second direction Y, in mm / s².

[0074] In step S3, the displacement x of the center of mass O of the vibrating screen in the first direction and the first amplitude The equivalent relationship between the displacement y of the center of mass O of the vibrating screen in the second direction Y and the second amplitude The equivalent relationship between them is as follows:

[0075]

[0076] Formula (3)

[0077] By taking the derivative of (3), we can obtain:

[0078]

[0079] Therefore, formula (2) can be simplified as:

[0080]

[0081] The above formula is simplified by using the trigonometric function signal addition algorithm, and the signal addition processing of formula (2) is performed to obtain:

[0082]

[0083] Combining equations (4) and (5) we can get:

[0084]

[0085] Simplifying the above formula, we can calculate the first amplitude of the vibrating screen in the first direction X: , the second amplitude in the second direction Y Satisfy the following formula:

[0086]

[0087] In the present invention, the relevant parameters of the vibrating screen are set as follows:

[0088] (1) The weight of a single swing hammer is 58kg, the weight of a single eccentric block is 3kg, and the weight of the vibrating screen in an empty state is 10T;

[0089] (2) The first swing hammer 712 and the second swing hammer 812 have the same rotation speed of 950 r / min; the eccentric distance of the movement of the first swing hammer 712 and the second swing hammer 812 is 146 mm, that is, the distance between the center of gravity of the swing hammer and the axis of the transmission shaft;

[0090] (3) The number of eccentric blocks provided on the first swing hammer 712 is 0, and the number of eccentric blocks provided on the second swing hammer 812 is 32, so that the overall weight of the second swing hammer 812 is greater than the overall weight of the first swing hammer 712.

[0091] Substitute the above parameters into the calculation:

[0092]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098] The signal addition formula is:

[0099]

[0100] In step S4, the single amplitude of the vibrating screen =8.29mm, which is much larger than the single amplitude of 4mm-6mm in the prior art. Therefore, the vibrating screen in the present invention has a good screening effect.

[0101] In order to ensure the stability of the overall structure of the vibrating screen, the steel used in the main structure of the screen is ASTM36 or AISI1060. The corresponding performance parameters of the material are as follows: Fig.11As shown, in the case of an empty screen, a load of 431200N is applied to the screen body 1, and the weight generated by the screen body under gravity is added. The sieve body 1 is tested for parameters such as safety factor, stress distribution and equivalent displacement distribution of the sieve body 1 in random vibration of 0-900Hz by finite element and other testing software. In the present invention, Fig.12 As shown, the safety factor of the entire sieve structure is 6.224, which is much greater than the minimum safety factor of 1, and the overall safety performance is good. Fig.13 As shown, the maximum stress is 40.888MPa, which is much smaller than the yield strength and ultimate tensile strength of the above materials, so the overall structure is stable and reliable. Fig.14 , which is the equivalent displacement distribution of the screen body under load, and its maximum displacement value is 1.394mm. Since its stress does not exceed the yield strength of the material, the displacement belongs to elastic deformation. It can be seen that the overall structure of the vibrating screen of the present invention is stable, and can provide a large amplitude and high screening efficiency.

[0102] In summary, the embodiments of the present invention provide an ultra-large vibrating screen and an amplitude calculation method. A frame 6 is provided in the middle of the screen body 1, and multiple driving mechanisms 2 are fixed on the frame 6, so that the amplitude distribution on the screen body is more uniform, thereby improving the screening effect. The center line of the driving mechanism 2 coincides with the center line of the frame 6, and the driving mechanism 2 is centrally arranged. A single driving mechanism 2 can drive two groups of first excitation units 71, which can reduce the size of the transmission shaft 23 of the driving mechanism 2, so that the first excitation units 71 on both sides of the screen body 1 are synchronized to avoid torsional vibration of the screen body 1 due to unilateral force. In addition, the first excitation component 7 and the second excitation component 8 are connected to the screen body 1 through the bearing seat plate 9 to realize vibration transmission and improve the vibration transmission efficiency. In addition, when the total mass of the vibrating screen hammer is constant, the mass of the second hammer 822 is adjusted to be greater than the mass of the first hammer 712, which can generate an elliptical trajectory exciting force to avoid material jamming and clogging of the screen hole, which is helpful for large particle materials to move forward smoothly and also facilitates small particle materials to pass through the screen hole. The second hammer 822 is arranged close to the discharge end, thereby providing a larger amplitude to avoid material piling at the discharge end. In addition, under the condition that the total mass of the vibrating screen hammer is constant, since the vibrating screen of the present invention can provide a larger amplitude, the vibrating screen structure can be changed on this basis to reduce the mass of the screen body, break through the design size limitations of the existing vibrating screen, increase the screening area of ​​the vibrating screen, and improve the material processing capacity of the vibrating screen while increasing the amplitude; the vibrating screen of the present invention can provide a larger single amplitude and has a good screening effect.

[0103] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An ultra-large vibrating screen, characterized in that: It includes a screen body, a plurality of driving mechanisms, and a plurality of excitation mechanisms. One end of the screen body is provided with a feed port, and the other end is provided with a discharge port. A frame is provided in the middle of the sieve body above the sieve mesh, and a plurality of the driving mechanisms are arranged on the frame at intervals along a first direction, and the center line of the driving mechanism coincides with the center line of the frame; the first direction is the length direction of the inclined sieve body, the direction perpendicular to the sieve surface of the sieve body is the second direction, the width direction of the sieve body is the third direction, and the first direction is perpendicular to the second direction; The excitation mechanism comprises a first excitation component and a second excitation component which are spaced apart along the first direction, the first excitation component being arranged close to the feed port, and the second excitation component being arranged close to the discharge port; the driving mechanism has two symmetrically arranged output ends, the first excitation component comprises a first excitation unit which is symmetrically arranged at two output ends of the driving mechanism, the first excitation unit comprises a first rotating shaft and two first swinging hammers, bearing seats are arranged on both sides of the screen body, the first rotating shaft is rotatably connected to the bearing seats, two first swinging hammers are sleeved on the first rotating shaft, one end of the first rotating shaft is connected to the output end of the driving mechanism, and the two first swinging hammers are respectively located on both sides of the bearing seats; The second excitation assembly includes a second excitation unit symmetrically arranged at two output ends of the other driving mechanism, the second excitation unit includes a second rotating shaft and two second swinging hammers, the second rotating shaft is rotatably connected to the bearing seat plate, the second rotating shaft is sleeved with two second swinging hammers, one end of the second rotating shaft is connected to the output end of the driving mechanism, and the two second swinging hammers are respectively located on both sides of the bearing seat plate; The first swing hammer and the second swing hammer rotate synchronously in opposite directions, the weight of the second swing hammer is greater than the weight of the first swing hammer, and in an initial state, a central axis of the first swing hammer and a central axis of the second swing hammer form a certain angle; The driving mechanism includes a dual-axis motor, a first synchronous wheel, a transmission shaft, a second synchronous wheel, an elastic connecting member and a shock-absorbing support. There are multiple shock-absorbing supports, which are arranged at intervals on the frame along the third direction. The transmission shaft is passed through the shock-absorbing support, and the second synchronous wheel is fixed to one end of the transmission shaft, and the elastic connecting member is fixed to the other end. The other end of the elastic connecting member is fixedly connected to the first rotating shaft or the second rotating shaft. The output end of the dual-axis motor is provided with the first synchronous wheel, and a synchronous belt is connected between the first synchronous wheel and the second synchronous wheel. When the dual-axis motor works, the transmission shaft is driven to rotate, and then the first rotating shaft or the second rotating shaft is driven to rotate. The shock-absorbing support includes a coaxially arranged base, a first shock-absorbing ring, a second shock-absorbing ring, and a support bearing, the base is sequentially embedded with the first shock-absorbing ring, the second shock-absorbing ring and the support bearing in a radially inward direction, the first shock-absorbing ring is hollow inside and an annular oil circuit is provided, the outer wall of the first shock-absorbing ring is provided with an oil inlet, the outer wall of the second shock-absorbing ring is radially extended outward and provided with a sealing piston, the outer sleeve of the sealing piston is provided with a spring, the spring has a tendency to push the sealing piston to move radially inward along the second shock-absorbing ring, the inner side wall of the first shock-absorbing ring is provided with a sealing groove corresponding to the sealing piston, the sealing groove is provided with an oil hole connected with the annular oil circuit, the end face of the sealing piston is provided with an oil inlet channel connected with the oil inlet hole on the support bearing, which is used to introduce the oil in the annular oil circuit into the support bearing, and the support bearing is also provided with a sealable oil outlet hole.

2. The super-large vibrating screen according to claim 1, characterized in that: The first excitation unit and the second excitation unit have the same structure. The first excitation unit also includes a first bearing and a seal mounted on the first rotating shaft. The first bearing is embedded in the bearing seat plate and the first bearing is mounted on the first rotating shaft. The seal includes an oil slinger, an oil seal and a wear-resistant ring which are sequentially mounted on the first rotating shaft. The oil slinger is arranged in contact with the side wall of the first bearing, and the side wall of the wear-resistant ring is arranged in contact with the first swing hammer. A stopper for limiting the axial movement of the first swing hammer is also provided at the end of the first rotating shaft.

3. The super-large vibrating screen according to claim 1, characterized in that: A second connecting pipe is provided between the second damping ring and the supporting bearing, one end of the second connecting pipe is embedded in the oil inlet passage, and the other end of the second connecting pipe is embedded in the oil inlet hole.

4. The super-large vibrating screen according to claim 1, characterized in that: The elastic connecting member includes a first elastic connecting ring, a second elastic connecting ring, a connecting shaft, and a first connecting tube. The two ends of the connecting shaft are respectively fixed to the first elastic connecting ring and the second elastic connecting ring. The other end of the first elastic connecting ring is fixed to the first connecting tube, and the first connecting tube is sleeved on the end of the transmission shaft; the other end of the second elastic connecting ring is fixed to the first rotating shaft or the second rotating shaft.

5. The super-large vibrating screen according to claim 1, characterized in that: A fixing plate for the driving mechanism is provided on the frame, and an adjusting component for adjusting the installation height of the driving mechanism is provided above the fixing plate.

6. The super-large vibrating screen according to claim 5, characterized in that: The adjustment assembly includes support screws vertically arranged at the four corners of the fixing plate, the support screws are connected to the base of the driving mechanism, and two locking nuts are sleeved on the support screws, and the two locking nuts are respectively located on the upper and lower sides of the base.

7. The super-large vibrating screen according to claim 1, characterized in that: The angle has a value range of 30°-60°.

8. A method for calculating the amplitude of a super-large vibrating screen, based on the super-large vibrating screen according to any one of claims 1 to 7, comprising the following steps: S1, calculating the phase difference angle between the rotation axes of the first swing hammer and the second swing hammer; S2, calculating the exciting force of the vibrating screen in the first direction and the second direction, and the exciting moment of the vibrating screen at the center of mass; S3, calculating the first amplitude of the vibrating screen in the first direction , a second amplitude in a second direction ; S4. Calculate single amplitude .

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