Construction waste light and heavy substance screening system

Abstract

The invention discloses a construction waste light and heavy substance screening system which comprises a low-noise jaw crusher, a vibration screening machine device and a conveying mechanism. A discharging opening of the low-noise jaw crusher is connected with a feeding opening of the vibration screening device; an inner cavity of the vibration screening device comprises a bar screening mechanism, a steel screen screening mechanism and a flip-flow screen screening mechanism which are sequentially arranged from top to bottom, the conveying mechanism is a conveying belt machine, and the conveying belt machine is arranged below discharging ports of all material sliding grooves of the vibration screening device. The problems that when an existing jaw crusher operates, noise is large, screening is rough, and manual secondary screening is needed are solved.

Description

Technical Field

[0001] The invention relates to the field of construction waste processing equipment, in particular to a construction waste light and heavy material screening system. Background Art

[0002] When processing construction waste, it is usually necessary to crush the construction waste first and then screen it. In the prior art, jaw crushers are generally used to crush construction waste. The existing jaw crusher has a simple structure, which is mainly a crushing bin plus a static jaw plate structure and a movable jaw plate structure arranged in the crushing bin. The reciprocating motion of the movable jaw plate structure realizes the crushing of materials passing through the material channel between the static jaw plate structure and the movable jaw plate structure. There is a common problem with the existing crushing mechanism, that is, the noise is relatively large. There are many specific reasons, such as the impact and collision between the movable jaw and the fixed jaw plate, the high hardness of the jaw plate material but the poor shock absorption performance, the collision of the material and the jaw plate during the crushing process, etc. In order to solve the noise problem of the jaw crusher and reduce the noise generated during crushing, the prior art During the operation, the jaw crusher will be improved. The most common improvement is to add a sound insulation layer outside the crushing chamber. However, this improvement is difficult to fundamentally improve the noise problem, and the effect is also relatively general. Because the jaw crusher will continue to feed, even if sound insulation cotton is added around the crushing chamber, it is impossible to prevent the noise from the feed port. Therefore, we need to further explore the more fundamental reasons for the noise and improve the existing jaw crusher based on the fundamental reasons. Only in this way can the noise be effectively reduced. Then the existing screening after crushing is only rough screening with simple screening equipment. After such screening, manual sorting is often required. The disadvantages are low efficiency and high labor costs. For this reason, it is necessary to develop a new construction waste treatment equipment to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a system for screening light and heavy materials in construction waste, so as to solve the problems that the existing jaw crusher has high noise and rough screening during operation, and needs manual secondary screening.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A construction waste light and heavy material screening system comprises a low-noise jaw crusher, a vibrating screening device and a conveying mechanism, wherein the discharge port of the low-noise jaw crusher is connected to the feed port of the vibrating screening device, the inner cavity of the vibrating screening device comprises a rod screening mechanism, a steel plate mesh screening mechanism and a relaxation screen screening mechanism which are arranged in sequence from top to bottom, and the conveying mechanism is a conveyor belt conveyor which is arranged below the discharge port of each chute of the vibrating screening device.

[0005] In this scheme, a low-noise jaw crusher is used, so that the noise is lower when processing construction waste. In addition, there are more than three layers of screening mechanisms in the vibration screening device of this scheme, including a bar screening mechanism, a steel plate mesh screening mechanism and a relaxation screen screening mechanism from top to bottom. Such screening is relatively fine, and no manual sorting is required after the screening is completed. It is only necessary to use a conveyor belt to transport the screened materials separately. The specific screening process is as follows: the material enters the vibration screening device, and under the action of the exciter, the material is diverted by the bar screening mechanism and flows evenly downward. Among them, the material of 0-30mm passes through the sieve holes of the steel plate mesh screening mechanism and falls on the relaxation screen screening mechanism. The material of >30mm enters the No. 2 chute on the right side of the vibration screening device; Materials of 0-30mm enter the screening mechanism of the relaxation screen, and heavy materials of 0-5mm fall from the screen holes of the relaxation screen under the tension of the relaxation screen, and are transported out through the belt conveyor; light materials of 0-5mm and materials of 5-30mm enter the No. 1 chute on the right side of the vibrating screening device. Materials larger than 30mm are placed in the No. 2 chute on the right side of the vibrating screening device; under the action of the fan, light materials are blown from the No. 2 chute to the No. 1 chute.

[0006] Light materials of 0-5mm, materials of 5-30mm, and light materials of >30mm enter the belt conveyor from the No. 1 chute, and the mixed materials enter the second vibrating screen device (relaxation screen). The mixed materials are on the relaxation screen, and the heavy materials of 5-30mm fall from the screen holes of the relaxation screen under the action of the tensioning screening mechanism of the relaxation screen; light materials of 0-5mm, materials of 5-30mm, and light materials of >30mm fall from the screen of the second vibrating screen device as mixed light materials.

[0007] As a further preferred embodiment of the present invention, the low-noise jaw crusher includes a crushing bin, and a static jaw plate structure and a movable jaw plate structure are respectively provided on both sides of the inner cavity of the crushing bin, the upper part of the movable jaw plate structure is connected to the pulley through an eccentric shaft, the pulley is connected to the motor, and the lower outer end of the movable jaw plate structure is connected to the adjustment device, and is characterized in that: the static jaw plate structure includes a static jaw plate support structure and a static jaw plate body, and the side of the static jaw plate support structure facing the movable jaw plate structure is a vertical support surface, and the static jaw plate body is arranged on the vertical support surface, and the inner end surface of the longitudinal section of the static jaw plate body is stepped, and the length of the inner end surface of the static jaw plate body extending into the crushing channel gradually becomes shorter from top to bottom, and the inner end of the static jaw plate body is evenly provided with wavy crushing teeth.

[0008] In this scheme, the structure of the static jaw plate body in the crushing bin is adjusted, and a stepped jaw plate design is adopted. The multi-level buffered stepped jaw plate structure can effectively reduce the direct impact area between the material and the jaw plate. At the same time, the stepped structure widens the impact spectrum from a concentrated 500-800Hz to a 200-1500Hz distribution, avoiding the sensitive frequency band of the human ear. In addition, the crushing action of each level of the ladder produces a time difference of 5-10ms, which makes the sound waves interfere with each other. Therefore, the stepped structure significantly reduces the noise during crushing. The wavy crushing teeth increase the contact length between the teeth and the objects to be crushed, reduce the wear per unit length, and increase the service life of the static jaw plate body. In addition, this structure does not affect the discharge of fine ore from the tooth groove, reducing the blockage of the discharge port by fine ore.

[0009] As a further preferred embodiment of the present invention, the stepped structure of the inner end surface of the static jaw plate body has at least three steps.

[0010] Set up 3-4 steps, and the height difference of each step is 1.2-1.5 times the maximum particle size of the material.

[0011] As a further preferred embodiment of the present invention, the stepped structure of the inner end surface of the static jaw plate body is, from top to bottom, an upper step, a middle step and a lower step, and the angles between the working surfaces of the upper step, the middle step and the lower step and the vertical line are 45°, 35° and 25° respectively.

[0012] The step inclination adopts a gradual design of 25°-45° (larger angle at the top and smaller angle at the bottom), forming an "inverted pyramid" crushing chamber. After entering the crushing chamber, large pieces of material first contact the high-angle upper step. The 45° inclination decomposes the impact force into a normal component (crushing force) and a tangential component (friction force), reducing direct impact. Then the wavy tooth shape of the middle step causes rolling friction in the material, converting part of the impact energy into rotational kinetic energy. Finally, the small inclination design of the lower step prolongs the contact time with the material, achieving "soft landing" crushing. This step inclination design can significantly reduce noise without increasing energy consumption, while improving crushing efficiency.

[0013] As a further preferred embodiment of the present invention, the materials of the upper step, the middle step and the lower step are cemented carbide, high manganese steel and composite steel respectively.

[0014] The cemented carbide can be YG8 cemented carbide, and the composite steel can be high-hardness chromium carbide wear-resistant composite steel. This material change means a gradient distribution of mass. The heavy structure on the upper part can effectively suppress high-frequency vibrations, while the light structure on the lower part can reduce inertial impact, which can also effectively reduce noise.

[0015] As a further preferred embodiment of the present invention, the stepped transition zone of the stepped structure on the inner end surface of the static jaw plate body is a curved transition structure.

[0016] Using arc transition can avoid stress concentration.

[0017] As a further preferred embodiment of the present invention, the static jaw plate supporting structure includes a back plate, a second buffer layer of the static jaw plate, a rubber constraint layer, a first buffer layer of the static jaw plate, a damping layer and a working surface layer which are arranged in sequence from the outside to the inside. The materials of the back plate, the second buffer layer, the rubber constraint layer, the first buffer layer, the damping layer and the working surface layer are Q345B steel plate, nitrile rubber, Q235B steel plate, nitrile rubber, Mn-Cu damping alloy plate and ZGMn13-4 high manganese steel plate respectively. The outer end face and the inner end face of the rubber constraint layer are respectively provided with an outer buffer layer limit frame and an inner buffer layer limit frame for clamping the second buffer layer and the first buffer layer. The surface of the rubber constraint layer is evenly punched with holes, and the punching area accounts for 30%-35% of the entire constraint layer.

[0018] In this scheme, in addition to reducing noise through the stepped structure, a composite layer shock-absorbing structure is also used to further reduce noise. The composite layer shock-absorbing structure can achieve a gradual change in sound wave impedance and reduce sound reflection. From the metal layer on the surface to the rubber layer in the middle, a gradual change in sound impedance can be formed, reducing the sound reflection rate to 12% (the traditional structure is 68%). In addition, the impact interval of the stepped structure is 2-5ms, which matches the natural frequency of the damping layer of 200-500Hz, so that vibration wave interference and cancellation can be achieved; the rubber constraint layer of the static jaw plate of the above structure can limit the lateral deformation of the inner and outer end rubber layers and improve the bearing capacity, while the holes in the rubber constraint layer of the static jaw plate can form a local damping effect and enhance the absorption of high-frequency vibrations.

[0019] As a further preferred embodiment of the present invention, the movable jaw structure includes a movable jaw support structure and a movable jaw body, the inner end surface of the movable jaw body is provided with a linear rack arranged along the feeding and discharging direction, and the linear rack is staggered with the wavy crushing teeth.

[0020] In this scheme, the reason why the static jaw plate is greatly improved while the movable jaw plate is slightly improved is because such improvement will increase the mass. The increase in mass requires a larger power motor to drive it. A larger power motor not only means higher energy consumption, but also means greater noise. Therefore, the movable jaw plate structure is less improved. Here, the ratio of the tooth height h to the tooth pitch t of the linear rack is 0.3-0.4, and the traditional design is 0.5-0.6.

[0021] As a further preferred embodiment of the present invention, a light rubber shock-absorbing layer is further provided between the movable jaw plate supporting structure and the movable jaw plate body, and a shock-absorbing layer limiting frame is provided on the periphery of the light rubber shock-absorbing layer.

[0022] A shock-absorbing layer is still set up here, but in order to reduce the weight as much as possible, only a lightweight rubber shock-absorbing layer is set up.

[0023] As a further preferred embodiment of the present invention, a rubber cushion layer is provided between the base bottom of the crushing bin and the mounting surface; and the outer wall of the crushing bin is also covered with a sound-absorbing cotton layer.

[0024] A rubber shock-absorbing pad is installed between the foundation of the crushing bin and the mounting surface to achieve shock absorption. In order to minimize noise, a sound-absorbing cotton layer is further wrapped around the outer wall of the crushing bin.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. In this scheme, a low-noise jaw crusher is used, so that the noise is lower when processing construction waste. In addition, there are more than three layers of screening mechanisms in the vibration screening device of this scheme, including a bar screening mechanism, a steel plate mesh screening mechanism and a relaxation screen screening mechanism from top to bottom. This screening is more refined. After the screening is completed, there is no need for manual sorting. It only needs to use a conveyor belt to transport the screened materials separately.

[0026] 2. In this scheme, the structure of the static jaw plate body in the crushing bin is adjusted, and a stepped jaw plate design is adopted. The multi-level buffered stepped jaw plate structure can effectively reduce the direct impact area between the material and the jaw plate. At the same time, the stepped structure widens the impact spectrum from the concentrated 500-800Hz to the 200-1500Hz distribution, avoiding the sensitive frequency band of the human ear. In addition, the crushing action of each level of the ladder produces a time difference of 5-10ms, which makes the sound waves interfere and cancel each other. Therefore, the stepped structure significantly reduces the noise during crushing. The wavy crushing teeth increase the contact length between the teeth and the objects to be crushed, reduce the wear per unit length, and increase the service life of the static jaw plate body. In addition, this structure does not affect the discharge of fine ore from the tooth groove, reducing the blockage of the discharge port by fine ore.

[0027] 3. The step inclination adopts a gradual design of 25°-45° (the upper angle is large and the lower angle is small), forming an "inverted pyramid" crushing chamber. After entering the crushing chamber, large pieces of material first contact the high-angle upper step. The 45° inclination decomposes the impact force into a normal component (crushing force) and a tangential component (friction force), reducing direct impact; then the wave tooth shape of the middle step causes rolling friction in the material, converting part of the impact energy into rotational kinetic energy; finally, the small inclination design of the lower step prolongs the contact time with the material and realizes "soft landing" crushing. Through this step inclination design, significant noise reduction can be achieved without increasing energy consumption, while improving crushing efficiency.

[0028] 4. The cemented carbide can be YG8 cemented carbide, and the composite steel can be high-hardness chromium carbide wear-resistant composite steel. This material change means a gradient distribution of mass. The heavy structure on the upper part can effectively suppress high-frequency vibrations, while the light structure on the lower part can reduce inertial impact, which can also effectively reduce noise.

[0029] 5. Using arc transition can avoid stress concentration.

[0030] 6. In addition to reducing noise through the stepped structure, this solution also uses a composite layer shock-absorbing structure to further reduce noise. The composite layer shock-absorbing structure can achieve a gradual change in acoustic impedance and reduce sound reflection. From the metal layer on the surface to the rubber layer in the middle, a gradual change in acoustic impedance can be formed, reducing the sound reflection rate to 12% (the traditional structure is 68%). In addition, the impact interval of the stepped structure is 2-5ms, which matches the natural frequency of the damping layer of 200-500Hz, so that vibration wave interference can be achieved. The rubber constraint layer of the static jaw plate in the above structure can limit the lateral deformation of the inner and outer end rubber layers and improve the bearing capacity, while the holes in the rubber constraint layer of the static jaw plate can form a local damping effect and enhance the absorption of high-frequency vibrations.

[0031] 7. In this scheme, the reason why the static jaw plate is greatly improved while the movable jaw plate is slightly improved is because such improvement will increase the mass. The increase in mass requires a larger power motor to drive it. A larger power motor not only means higher energy consumption, but also means greater noise. Therefore, the movable jaw plate structure is less improved. Here, the ratio of the tooth height h to the tooth pitch t of the linear rack is 0.3-0.4, and the traditional design is 0.5-0.6.

[0032] 8. A light rubber shock-absorbing layer is also provided between the movable jaw support structure and the movable jaw body.

[0033] 9. Install rubber shock-absorbing pads between the crushing bin foundation and the mounting surface to achieve shock absorption.

[0034] 10. In order to reduce noise to the greatest extent, a sound-absorbing cotton layer is further wrapped on the outer wall of the crushing bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention.

[0036] Figure 2 It is a structural schematic diagram of the low noise jaw crusher of the present invention.

[0037] Figure 3 A working surface view of the static jaw plate body of the present invention. DETAILED DESCRIPTION

[0038] 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiments

[0044] Figure 1 , Figure 2 , Figure 3A system for screening light and heavy materials of construction waste is shown, including a low-noise jaw crusher, a vibrating screening device 8 and a conveying mechanism. The discharge port of the low-noise jaw crusher is connected to the feed port of the vibrating screening device 8. The inner cavity of the vibrating screening device 8 includes a rod screening mechanism, a steel plate mesh screening mechanism and a relaxation screen screening mechanism arranged in sequence from top to bottom. The conveying mechanism is a conveyor belt conveyor, which is arranged below the discharge port of each chute of the vibrating screening device 8.

[0045] In this scheme, a low-noise jaw crusher is used, so that the noise is lower when processing construction waste. In addition, there are more than three layers of screening mechanisms in the vibration screening device of this scheme, including a bar screening mechanism, a steel plate mesh screening mechanism and a relaxation screen screening mechanism from top to bottom. Such screening is relatively fine, and no manual sorting is required after the screening is completed. It is only necessary to use a conveyor belt to transport the screened materials separately. The specific screening process is as follows: the material enters the vibration screening device, and under the action of the vibrator, the material is diverted by the bar screening mechanism and flows evenly downward. Among them, the material of 0-30mm passes through the sieve holes of the steel plate mesh screening mechanism and falls on the relaxation screen screening mechanism. The material of >30mm enters the No. 2 chute 82 on the right side of the vibration screening device; The 0-30mm material enters the relaxation screen screening mechanism, and the 0-5mm heavy material falls from the screen hole of the relaxation screen screening mechanism under the tension of the relaxation screen screening mechanism and is transported out through the belt conveyor; the 0-5mm light material and the 5-30mm material enter the No. 1 chute 81 on the right side of the vibrating screening device. Materials with a diameter of more than 30 mm are placed in the No. 2 chute 82 on the right side of the vibrating screening device; under the action of the fan, light materials are blown from the No. 2 chute 82 to the No. 1 chute 81.

[0046] Light materials of 0-5mm, materials of 5-30mm, and light materials of >30mm enter the belt conveyor from the No. 1 chute 81, and the mixed materials enter the second vibrating screen device (relaxation screen). The mixed materials are on the relaxation screen, and the heavy materials of 5-30mm fall from the screen holes of the relaxation screen under the tension of the relaxation screen screening mechanism; light materials of 0-5mm, materials of 5-30mm, and light materials of >30mm fall from the screen of the second vibrating screen device as mixed light materials. Specific embodiments

[0047] The present embodiment further illustrates the low-noise jaw crusher on the basis of the specific embodiment 1. The low-noise jaw crusher comprises a crushing chamber 1. A static jaw plate structure 2 and a movable jaw plate structure 3 are respectively arranged on both sides of the inner cavity of the crushing chamber. The upper part of the movable jaw plate structure 3 is connected to the pulley through the eccentric shaft 4, and the pulley is connected to the motor. The lower outer end of the movable jaw plate structure 3 is connected to the adjustment device 5. It is characterized in that: the static jaw plate structure 2 comprises a static jaw plate support structure 21 and a static jaw plate body 22. The side of the static jaw plate support structure 21 facing the movable jaw plate structure 3 is a vertical support surface. The static jaw plate body 22 is arranged on the vertical support surface. The inner end surface of the longitudinal section of the static jaw plate body 22 is stepped. The length of the inner end surface of the static jaw plate body 22 extending into the crushing channel gradually becomes shorter from top to bottom. The inner end of the static jaw plate body 22 is evenly provided with wavy crushing teeth 6.

[0048] In this scheme, the structure of the static jaw plate body in the crushing bin is adjusted, and a stepped jaw plate design is adopted. The multi-level buffered stepped jaw plate structure can effectively reduce the direct impact area between the material and the jaw plate. At the same time, the stepped structure widens the impact spectrum from a concentrated 500-800Hz to a 200-1500Hz distribution, avoiding the sensitive frequency band of the human ear. In addition, the crushing action of each level of the ladder produces a time difference of 5-10ms, which makes the sound waves interfere with each other. Therefore, the stepped structure significantly reduces the noise during crushing. The wavy crushing teeth increase the contact length between the teeth and the objects to be crushed, reduce the wear per unit length, and increase the service life of the static jaw plate body. In addition, this structure does not affect the discharge of fine ore from the tooth groove, reducing the blockage of the discharge port by fine ore. Specific embodiments

[0049] This embodiment further illustrates the static jaw plate body 22 on the basis of the specific embodiment 1. The stepped structure of the inner end surface of the static jaw plate body 22 has at least three steps.

[0050] Set up 3-4 steps, and the height difference of each step is 1.2-1.5 times the maximum particle size of the material. Specific embodiments

[0051] This embodiment further illustrates the static jaw plate body 22 on the basis of specific embodiment 3. The stepped structure of the inner end surface of the static jaw plate body 22 is an upper step, a middle step and a lower step from top to bottom, and the angles between the working surfaces of the upper step, the middle step and the lower step and the vertical line are 45°, 35° and 25° respectively.

[0052] The step inclination adopts a gradual design of 25°-45° (larger angle at the top and smaller angle at the bottom), forming an "inverted pyramid" crushing chamber. After entering the crushing chamber, large pieces of material first contact the high-angle upper step. The 45° inclination decomposes the impact force into a normal component (crushing force) and a tangential component (friction force), reducing direct impact. Then the wavy tooth shape of the middle step causes rolling friction in the material, converting part of the impact energy into rotational kinetic energy. Finally, the small inclination design of the lower step prolongs the contact time with the material, achieving "soft landing" crushing. This step inclination design can significantly reduce noise without increasing energy consumption, while improving crushing efficiency. Specific embodiments

[0053] This embodiment further illustrates the upper step, the middle step and the lower step on the basis of the specific embodiment 4. The materials of the upper step, the middle step and the lower step are cemented carbide, high manganese steel and composite steel respectively.

[0054] The cemented carbide can be YG8 cemented carbide, and the composite steel can be high-hardness chromium carbide wear-resistant composite steel. This material change means a gradient distribution of mass. The heavy structure on the upper part can effectively suppress high-frequency vibrations, while the light structure on the lower part can reduce inertial impact, which can also effectively reduce noise. Specific embodiments

[0055] This embodiment further illustrates the static jaw plate body 22 on the basis of the specific embodiment 1, and the stepped transition zone of the stepped structure on the inner end surface of the static jaw plate body 22 is a curved surface transition structure.

[0056] Using arc transition can avoid stress concentration. Specific embodiments

[0057] This embodiment further describes the static jaw plate support structure 21 on the basis of the specific embodiment 1. The static jaw plate support structure 21 includes a back plate 211, a second buffer layer 212 of the static jaw plate, a rubber constraint layer 213, a first buffer layer 214 of the static jaw plate, a damping layer 215 and a working surface layer 216, which are arranged in sequence from the outside to the inside. The back plate 211, the second buffer layer 212 of the static jaw plate, the rubber constraint layer 213, the first buffer layer 214 of the static jaw plate, the damping layer 215 and the working surface layer 216 are The materials of the surface layer 216 are Q345B steel plate, nitrile rubber, Q235B steel plate, nitrile rubber, Mn-Cu damping alloy plate and ZGMn13-4 high manganese steel plate in sequence. The outer end face and inner end face of the rubber constraint layer 213 are respectively provided with an outer buffer layer limit frame and an inner buffer layer limit frame for clamping the second buffer layer 212 and the first buffer layer 214. The surface of the rubber constraint layer 213 is evenly punched with holes, and the punching area accounts for 30%-35% of the entire constraint layer.

[0058] In this scheme, in addition to reducing noise through the stepped structure, a composite layer shock-absorbing structure is also used to further reduce noise. The composite layer shock-absorbing structure can achieve a gradual change in sound wave impedance and reduce sound reflection. From the metal layer on the surface to the rubber layer in the middle, a gradual change in sound impedance can be formed, reducing the sound reflection rate to 12% (the traditional structure is 68%). In addition, the impact interval of the stepped structure is 2-5ms, which matches the natural frequency of the damping layer of 200-500Hz, so that vibration wave interference and cancellation can be achieved; the rubber constraint layer of the static jaw plate of the above structure can limit the lateral deformation of the inner and outer end rubber layers and improve the bearing capacity, while the holes in the rubber constraint layer of the static jaw plate can form a local damping effect and enhance the absorption of high-frequency vibrations. Specific embodiments

[0059] This embodiment further illustrates the movable jaw structure 3 on the basis of the specific embodiment 1. The movable jaw structure 3 includes a movable jaw support structure 31 and a movable jaw body 32. The inner end surface of the movable jaw body (32) is provided with a linear rack 7 arranged along the feeding and discharging direction. The linear rack 7 is staggered with the wavy crushing teeth 6.

[0060] In this scheme, the reason why the static jaw plate is greatly improved while the movable jaw plate is slightly improved is because such improvement will increase the mass. The increase in mass requires a larger power motor to drive it. A larger power motor not only means higher energy consumption, but also means greater noise. Therefore, the movable jaw plate structure is less improved. Here, the ratio of the tooth height h to the tooth pitch t of the linear rack is 0.3-0.4, and the traditional design is 0.5-0.6. Specific embodiments

[0061] This embodiment further illustrates the movable jaw support structure 31 based on the specific embodiment 8. A light rubber shock absorbing layer 33 is provided between the movable jaw support structure 31 and the movable jaw body 32. A shock absorbing layer limiting frame is provided on the periphery of the light rubber shock absorbing layer 33.

[0062] A light rubber shock-absorbing layer is also provided between the movable jaw support structure and the movable jaw body. Specific embodiment 10: This embodiment further illustrates the crushing bin 1 on the basis of the specific embodiment 7. A rubber cushion layer is provided between the base bottom and the mounting surface of the crushing bin 1. The outer wall of the crushing bin 1 is also covered with a sound-absorbing cotton layer.

[0064] A rubber shock-absorbing pad is installed between the foundation of the crushing bin and the mounting surface to achieve shock absorption. In order to minimize noise, a sound-absorbing cotton layer is further wrapped around the outer wall of the crushing bin.

[0065] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction waste light and heavy material screening system, comprising a low-noise jaw crusher, a vibrating screening device (8) and a conveying mechanism, wherein the discharge port of the low-noise jaw crusher is connected to the feed port of the vibrating screening device (8), the inner cavity of the vibrating screening device (8) comprises a bar screening mechanism, a steel plate mesh screening mechanism and a relaxation screen screening mechanism arranged in sequence from top to bottom, and the conveying mechanism is a conveyor belt conveyor, which is arranged below the discharge port of each chute of the vibrating screening device.

2. According to the construction waste light and heavy material screening system of claim 1, the low-noise jaw crusher comprises a crushing chamber (1), a static jaw plate structure (2) and a movable jaw plate structure (3) are respectively provided on both sides of the inner cavity of the crushing chamber, the upper part of the movable jaw plate structure (3) is connected to a pulley through an eccentric shaft (4), the pulley is connected to a motor, and the lower outer end of the movable jaw plate structure (3) is connected to an adjustment device (5), characterized in that: The static jaw plate structure (2) comprises a static jaw plate supporting structure (21) and a static jaw plate body (22), wherein the side of the static jaw plate supporting structure (21) facing the movable jaw plate structure (3) is a vertical supporting surface, and the static jaw plate body (22) is arranged on the vertical supporting surface. The inner end surface of the longitudinal section of the static jaw plate body (22) is stepped, and the length of the inner end surface of the static jaw plate body (22) extending into the crushing channel gradually becomes shorter from top to bottom, and the inner end of the static jaw plate body (22) is evenly distributed with wavy crushing teeth (6).

3. The construction waste light and heavy material screening system according to claim 1 is characterized by: The stepped structure of the inner end surface of the static jaw plate body (22) has at least three steps.

4. The construction waste light and heavy material screening system according to claim 3 is characterized by: The stepped structure of the inner end surface of the static jaw plate body (22) comprises, from top to bottom, an upper step, a middle step and a lower step, and the angles between the working surfaces of the upper step, the middle step and the lower step and the vertical line are 45°, 35° and 25° respectively.

5. The construction waste light and heavy material screening system according to claim 4 is characterized by: The materials of the upper step, the middle step and the lower step are hard alloy, high manganese steel and composite steel respectively.

6. The construction waste light and heavy material screening system according to claim 1 is characterized by: The stepped transition zone of the stepped structure on the inner end surface of the static jaw plate body (22) is a cambered transition structure.

7. The construction waste light and heavy material screening system according to claim 1 is characterized by: The static jaw plate support structure (21) comprises a back plate (2111), a second buffer layer (212) of the static jaw plate, a rubber constraint layer (213), a first buffer layer (214) of the static jaw plate, a damping layer (215) and a working surface layer (216) which are arranged in sequence from the outside to the inside. The materials of the back plate (2111), the second buffer layer (212) of the static jaw plate, the rubber constraint layer (213), the first buffer layer (214) of the static jaw plate, the damping layer (215) and the working surface layer (216) are The components are Q345B steel plate, nitrile rubber, Q235B steel plate, nitrile rubber, Mn-Cu damping alloy plate and ZGMn13-4 high manganese steel plate in sequence; the outer end surface and inner end surface of the rubber constraint layer (213) are respectively provided with an outer buffer layer limit frame and an inner buffer layer limit frame for clamping the second buffer layer (212) and the first buffer layer (214); the surface of the rubber constraint layer (213) is evenly punched with holes, and the punched area accounts for 30%-35% of the entire constraint layer.

8. The construction waste light and heavy material screening system according to claim 1 is characterized by: The movable jaw structure (3) comprises a movable jaw support structure (31) and a movable jaw body (32); the inner end surface of the movable jaw body (32) is provided with a linear rack (7) arranged along the material feeding and discharging direction; the linear rack (7) and the wavy crushing teeth (6) are arranged in an alternating manner.

9. The construction waste light and heavy material screening system according to claim 1, characterized in that: A light rubber shock-absorbing layer (33) is also provided between the movable jaw plate supporting structure (31) and the movable jaw plate body (32), and a shock-absorbing layer limiting frame is provided on the periphery of the light rubber shock-absorbing layer (33).

10. The construction waste light and heavy material screening system according to claim 1, characterized in that: A rubber cushion layer is also provided between the base bottom of the crushing bin (1) and the mounting surface; and the outer wall of the crushing bin (1) is also covered with a sound-absorbing cotton layer.

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