A bituminous mixing plant recycled material buffer device
By installing a mixing cylinder above the buffer silo, the anti-sticking agent and hot recycled material are mixed in the mixing cylinder before entering the buffer silo, which solves the problem of the anti-sticking agent being sucked away, and achieves efficient utilization of the anti-sticking agent and a reduction in the burden of flue gas treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI DAOQING NEW BUILDING MATERIALS TECH CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, anti-sticking agents are easily absorbed by flue gas treatment facilities during addition, resulting in waste and increased burden on these facilities.
A mixing cylinder is installed above the buffer silo. The anti-sticking agent and the hot recycled material are mixed in the mixing cylinder before entering the buffer silo to prevent the anti-sticking agent from being sucked away by the gas collection hood. The mixture is then conveyed to the mixing equipment below through the unloading mechanism.
This reduces the waste of anti-sticking agents, lowers the burden on flue gas treatment equipment, and improves the utilization efficiency of anti-sticking agents.
Smart Images
Figure CN224412249U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of recycled asphalt production technology, and more specifically, relates to a recycled material buffer device for asphalt mixing plants. Background Technology
[0002] The asphalt mixing and recycling process involves milling, crushing, and screening asphalt concrete pavement to obtain recyclable asphalt material. During the mixing of recycled asphalt in a mixing plant, a certain proportion of new aggregates, new asphalt, recycling agents, and powders are added to the recycled material. After heating and mixing, new recycled asphalt concrete is obtained for road paving.
[0003] Recycled aggregate is heated before being added to the mixing plant. The heated aggregate is then transported to a recycling silo via a chute or belt conveyor for temporary storage. When needed, an appropriate proportion of recycled aggregate is added to the mixing plant using a metering and weighing device. Compared to virgin aggregate, recycled aggregate has a more complex composition, exhibits greater viscosity after heating, and produces more fumes. During storage, due to gravity and its own viscosity, recycled aggregate easily clumps together or adheres to the inner wall of the silo. Therefore, an anti-sticking agent needs to be added. Existing anti-sticking agents are typically powdered, such as mineral powder or talc. Diesel fuel has also been used, but because diesel fuel decomposes asphalt, damaging its chemical properties and consequently affecting the material properties of asphalt concrete, most mixing plants no longer use this method.
[0004] The hot recycled materials stored in the recycling silo generate a significant amount of irritating fumes, necessitating the installation of a fume hood at the top of the silo for purification using a flue gas treatment system. The fume hood is connected to a negative pressure fan to extract the fumes. Current technology involves adding anti-sticking agent directly through the feed inlet at the top of the recycling silo, causing the agent to adhere to the surface of the recycled material. Because the powdered anti-sticking agent is lightweight, some of it is absorbed by the fume hood and ultimately enters the flue gas treatment system. This results in both a waste of the anti-sticking agent and an increased workload on the flue gas treatment system. Utility Model Content
[0005] Based on the above-mentioned technical problems, this application provides a recycled material buffer device for asphalt mixing plants to solve the technical problem that some of the anti-sticking agent added in the prior art is absorbed by the flue gas treatment facility.
[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a recycled asphalt mixing plant buffer device, comprising:
[0007] The buffer hopper has a feed inlet at the top and a discharge mechanism at the bottom.
[0008] A gas collection hood is installed above the feed inlet and is used to connect with the flue gas treatment equipment;
[0009] A mixing assembly includes a mixing cylinder and a driving mechanism. The mixing cylinder is cylindrical and inclined in the vertical direction, with its lower end located above the feed inlet. A mixing chamber is formed inside the mixing cylinder, extending through the upper and lower ends of the mixing cylinder along its own axial direction, and forming a mixing inlet and a mixing outlet respectively. The driving mechanism is used to drive the mixing cylinder to rotate around its own central axis.
[0010] A recycled material conveying assembly, wherein the discharge end of the recycled material conveying assembly extends from the mixing inlet into the mixing chamber;
[0011] An anti-sticking agent delivery assembly, wherein the discharge end of the anti-sticking agent delivery assembly extends from the mixing inlet into the mixing chamber.
[0012] In one possible implementation, the asphalt mixing plant recycled material buffer device further includes a support frame, and the buffer silo, the air collection hood, the mixing cylinder, the drive mechanism, the recycled material conveying assembly and the anti-sticking agent conveying assembly are respectively disposed on the support frame, and the mixing cylinder is rotatably coupled with the support frame.
[0013] In one possible implementation, the support frame is provided with a support base located on one side of the buffer hopper and has a mounting hole that is inclined downward toward the feed inlet, and the outer wall of the mixing cylinder is rotatably engaged with the inner wall of the mounting hole.
[0014] In one possible implementation, the coverage area of the gas collecting hood is larger than the feed inlet, and the outer periphery of the gas collecting hood is also provided with a flexible curtain. The upper end of the curtain is connected to the side wall of the gas collecting hood, and the lower end of the curtain hangs freely to a height lower than the feed inlet.
[0015] In one possible implementation, the gas collection hood has an air inlet and a gas collection chamber connected to the air inlet, the air inlet being downwardly oriented, and a gas pipe being connected to the top of the gas collection chamber for connecting to a flue gas treatment device.
[0016] In one possible implementation, the mixing cylinder is provided with a toothed ring on its outer periphery, the toothed ring being formed by sequentially splicing multiple segmented racks, the driving mechanism including a drive motor and a gear, the motor shaft of the drive motor being connected to the gear for transmission, and the gear meshing with the toothed ring.
[0017] In one possible implementation, the recycled material conveying assembly is one of a chute, a belt conveyor, or a screw conveyor. When the recycled material conveying assembly is a chute, the chute is inclined downward along the material conveying direction.
[0018] In one possible implementation, the anti-sticking agent delivery assembly includes:
[0019] Anti-stick storage container for storing powdered anti-stick agents; and
[0020] The discharge mechanism is located at the bottom of the anti-sticking agent storage tank, and the discharge end of the discharge mechanism extends from the mixing inlet into the mixing chamber.
[0021] In one possible implementation, the discharge mechanism is a screw conveyor.
[0022] In one possible implementation, the bottom of the buffer hopper has a conical collecting section, and the unloading mechanism is located at the bottom of the collecting section.
[0023] Compared with the prior art, the beneficial effects of the asphalt mixing plant recycled material buffer device provided in this application are:
[0024] This application provides a recycled asphalt buffer device for an asphalt mixing plant, comprising a buffer silo, a gas collection hood, a mixing assembly, a recycled asphalt conveying assembly, and an anti-sticking agent conveying assembly. The buffer silo stores hot recycled asphalt. The gas collection hood is positioned above the buffer silo to collect the fumes emitted by the hot recycled asphalt. The anti-sticking agent conveying assembly delivers anti-sticking agent to the mixing drum, and the recycled asphalt conveying assembly delivers heated recycled asphalt to the mixing drum. The anti-sticking agent and hot recycled asphalt are mixed together by the rotation of the mixing drum. The anti-sticking agent reduces the surface tack of the hot recycled asphalt, making it less likely for the recycled asphalt to clump or adhere to the inner wall of the buffer silo. The mixing drum is tilted, and the anti-sticking agent and hot recycled asphalt are mixed and moved downwards, eventually falling from the mixing outlet into the buffer silo below. When mixing is required, the hot recycled asphalt is conveyed to the mixing equipment below via a discharge mechanism for mixing recycled asphalt.
[0025] This application sets up a mixing cylinder above the buffer silo, so that the anti-sticking agent and the hot recycled material are mixed evenly in the mixing cylinder, and then fall into the buffer silo below through the mixing outlet. The mixing cylinder is a semi-enclosed space, so the anti-sticking agent is not easily sucked away by the gas collection hood, which reduces the waste of anti-sticking agent and reduces the processing burden of the flue gas treatment equipment. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 A perspective view of a recycled material buffer device for an asphalt mixing plant provided in an embodiment of this application;
[0028] Figure 2 A perspective view of a recycled material buffer device for an asphalt mixing plant with a hidden gas collection hood, provided in an embodiment of this application;
[0029] Figure 3 for Figure 2 Enlarged view of part A in the middle;
[0030] Figure 4 A cross-sectional view of a recycled material buffer device for an asphalt mixing plant with a concealed gas collection hood, provided in an embodiment of this application;
[0031] Explanation of reference numerals in the attached figures:
[0032] 10. Buffer hopper; 11. Collection section; 12. Unloading mechanism; 20. Gas collection hood; 21. Curtain; 22. Gas pipeline; 30. Mixing assembly; 31. Mixing cylinder; 311. Mixing outlet; 312. Gear ring; 32. Drive mechanism; 321. Gear; 322. Drive motor; 40. Chute; 50. Anti-sticking agent conveying assembly; 51. Anti-sticking agent storage tank; 52. Discharge mechanism; 60. Support frame; 61. Support base. Detailed Implementation
[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0038] Please refer to the following: Figures 1 to 4 The following describes a recycled material buffer device for an asphalt mixing plant provided in an embodiment of this application.
[0039] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This application provides a recycled material buffer device for an asphalt mixing plant, including a buffer silo 10, a gas collection hood 20, a mixing component 30, a recycled material conveying component, and an anti-sticking agent conveying component 50. The buffer silo 10 has a feed inlet at the top and a discharge mechanism 12 at the bottom; the gas collection hood 20 is located above the feed inlet and is used to communicate with a flue gas treatment device; the mixing component 30 includes a mixing cylinder 31 and a driving mechanism 32. The mixing cylinder 31 is cylindrical and inclined in the vertical direction, with its lower end located above the feed inlet; a mixing chamber is formed inside the mixing cylinder 31, which extends through the upper and lower ends of the mixing cylinder 31 along its own axial direction and has a mixing inlet and a mixing outlet 311 respectively; the driving mechanism 32 is used to drive the mixing cylinder 31 to rotate around its own central axis; the discharge end of the recycled material conveying component extends from the mixing inlet into the mixing chamber; the discharge end of the anti-sticking agent conveying component 50 extends from the mixing inlet into the mixing chamber.
[0040] Compared with the prior art, the beneficial effects of the asphalt mixing plant recycled material buffer device provided in this application embodiment are:
[0041] This application provides an embodiment of a recycled asphalt mixing plant buffer device, comprising a buffer silo 10, a gas collection hood 20, a mixing component 30, a recycled material conveying component, and an anti-sticking agent conveying component 50. The buffer silo 10 stores hot recycled material. The gas collection hood 20 is positioned above the buffer silo 10 to collect the fumes emitted by the hot recycled material. The anti-sticking agent conveying component 50 conveys anti-sticking agent to the mixing drum 31, and the recycled material conveying component conveys heated recycled material to the mixing drum 31. The anti-sticking agent and hot recycled material are mixed together by the rotation of the mixing drum 31. The anti-sticking agent reduces the surface tackiness of the hot recycled material, making it less likely for the recycled material to clump or adhere to the inner wall of the buffer silo 10. The mixing drum 31 is inclined, and the anti-sticking agent and hot recycled material move downwards while mixing, eventually falling from the mixing outlet 311 into the buffer silo 10 below. When mixing is required, hot recycled material is conveyed to the mixing equipment below via the unloading mechanism 12 for mixing recycled asphalt.
[0042] In this embodiment, a mixing cylinder 31 is provided above the buffer silo 10 so that the anti-sticking agent and the hot recycled material are mixed evenly in the mixing cylinder 31 and then fall into the buffer silo 10 below through the mixing outlet 311. The mixing cylinder 31 is a semi-enclosed space, so the anti-sticking agent is not easily sucked away by the gas collection hood 20, which reduces the waste of anti-sticking agent and reduces the processing burden of the flue gas treatment equipment.
[0043] The buffer silo 10 is a hollow tank or box structure used to store the hot recycled material after mixing with the anti-sticking agent. The buffer silo 10 is typically located above the mixing equipment. After the unloading mechanism 12 is opened, the hot recycled material is conveyed into the mixing equipment through the unloading mechanism 12. The buffer silo 10 can be in the shape of a cylinder, square, or other common containers. The bottom of the buffer silo 10 has a conical collecting section 11, and the unloading mechanism 12 is located at the bottom of the collecting section 11.
[0044] The unloading mechanism 12 is a common unloading device in the prior art. There are no restrictions on the specific specifications and models of the unloading mechanism 12. For example, it can be a slide valve, a rotary valve, etc., as long as it can be used for unloading asphalt materials.
[0045] When heated, the recycled material will release volatile gases and irritating gases, which need to be collected by a gas collection hood 20 installed above the buffer silo. The gas collection hood 20 is connected to a flue gas treatment device, which treats the flue gas through filtration, dust removal, activated carbon adsorption, and other methods. The flue gas treatment device is a conventional treatment device in existing technology, which only needs to have the functions of dust removal and adsorption purification.
[0046] The mixing assembly 30 includes a mixing cylinder 31 and a drive mechanism 32. The mixing cylinder 31 is a hollow cylindrical body, and the drive mechanism 32 is used to drive the mixing cylinder 31 to rotate. The anti-sticking agent and the hot recycled material are conveyed into the mixing cylinder 31. Under the rotation of the mixing cylinder 31, the anti-sticking agent and the hot recycled material are mixed together, reducing the surface stickiness of the hot recycled material. The hot recycled material is less likely to clump in the buffer silo 10 or adhere to the inner wall of the buffer silo 10.
[0047] Anti-sticking agents can be made from mineral powder, talc, etc., which are currently used in technology. The amount of anti-sticking agent added is determined according to the conveying volume of the hot recycled material. Although the more anti-sticking agent added, the lower the surface stickiness of the hot recycled material, excessive addition of anti-sticking agent can also affect the physical properties of asphalt concrete. Therefore, the amount of anti-sticking agent added needs to be selected according to the actual situation during operation.
[0048] The drive mechanism 32 is used to drive the mixing cylinder 31 to rotate around its own axis. The drive mechanism 32 can be a drive motor 322, a hydraulic rotary motor or other drive equipment in the prior art, and power is transmitted through belt drive, chain drive or other means.
[0049] There are no specific restrictions on parameters such as the tilt angle and rotation speed of the mixing cylinder 31. Users can choose and set these parameters according to actual conditions. For example, the tilt angle of the mixing cylinder 31 can be 15°-30°, and the amount of anti-sticking agent added can be 0.8-1.5% of the recycled material. If necessary, blades, protrusions, toothed blocks, etc., can be installed on the inner wall of the mixing cylinder 31 to agitate the recycled material and ensure thorough mixing of the anti-sticking agent. The mixing outlet 311 is directly aligned with the feed inlet of the buffer silo 10. During the descent, a small amount of anti-sticking agent may still be sucked away by the negative pressure of the gas collection hood. Figure 2 , Figure 3 As shown, a fixed baffle can be installed above the mixing outlet 311. The baffle is fixedly connected to the support base 61, which can reduce the amount of anti-sticking agent that is sucked away from the mixing outlet 311 by negative pressure.
[0050] The recycled material conveying assembly can be any existing conveying equipment used for conveying asphalt materials, such as a belt conveyor, chute 40, screw conveyor, etc. When the recycled material conveying assembly is a chute 40, the chute 40 is inclined downwards along the material conveying direction. The anti-sticking agent conveying assembly 50 can be any conveying equipment suitable for conveying powdery materials, such as a belt conveyor or screw conveyor.
[0051] Please see Figure 1 , Figure 2 and Figure 4 A recycled material buffer device for an asphalt mixing plant also includes a support frame 60, a buffer silo 10, an air collection hood 20, a mixing cylinder 31, a drive mechanism 32, a recycled material conveying assembly, and an anti-sticking agent conveying assembly 50, which are respectively disposed on the support frame 60. The mixing cylinder 31 is rotatably coupled with the support frame 60.
[0052] The support frame 60 can be formed by welding structural steel and steel plates to create a stable support. When the height is high, a staircase can be installed on the support frame 60 for operators to go up and down.
[0053] Please see Figure 3 The support frame 60 is provided with a support base 61, which is located on one side of the buffer hopper 10 and has an installation hole that is inclined downward toward the feed inlet. The outer wall of the mixing cylinder 31 is rotatably engaged with the inner wall of the installation hole. In order to reduce rotational resistance, rolling elements such as balls can be set between the inner wall of the installation hole and the outer wall of the mixing cylinder 31, and lubricating oil is added periodically for lubrication.
[0054] Please see Figure 1 and Figure 4 The gas collection hood 20 can be square or round. To prevent the escape of smoke and dust, the coverage area needs to be larger than the feed inlet. In order to improve the collection effect of the flue gas, a flexible curtain 21 is also provided on the outer periphery of the gas collection hood 20. The upper end of the curtain 21 is connected to the side wall of the gas collection hood 20, and the lower end of the curtain 21 hangs freely to a height lower than the feed inlet.
[0055] The curtain 21 creates a more enclosed space, preventing the fumes from the hot recycled material from spreading from all sides. It should be noted that, in order to avoid the curtain 21 interfering with the rotation of the mixing cylinder 31, the side of the gas collecting hood 20 adjacent to the mixing cylinder 31 may not have the curtain 21 installed.
[0056] Please see Figure 1 and Figure 4 The gas collection hood 20 has a downward-facing air inlet and a gas collection chamber connected to the air inlet. The air inlet is set downwards, and the top of the gas collection chamber is connected to a gas pipe 22, which is used to connect to the flue gas treatment equipment.
[0057] Please see Figure 2 and Figure 3 The mixing cylinder 31 is provided with a gear ring 312 on its outer periphery. The gear ring 312 is formed by multiple segmented racks spliced together in sequence. The segmented racks are connected and fixed to the mixing cylinder 31 by welding or bolting. The drive mechanism 32 includes a drive motor 322 and a gear 321. The motor shaft of the drive motor 322 is connected to the gear 321 for transmission. The gear 321 meshes with the gear ring 312, thereby driving the mixing cylinder 31 to rotate.
[0058] Please see Figure 1 and Figure 4 The anti-sticking agent delivery assembly 50 includes an anti-sticking agent storage tank 51 and a discharge mechanism 52. The anti-sticking agent storage tank 51 is used to store powdered anti-sticking agent; the discharge mechanism 52 is located at the bottom of the anti-sticking agent storage tank 51, and the discharge end of the discharge mechanism 52 extends from the mixing inlet into the mixing chamber.
[0059] The discharge mechanism 52 is existing technology. Specifically, it can be a screw feeder, star feeder, pneumatic feeder, or other discharge mechanism 12 suitable for powdery materials. It can achieve continuous and uniform discharge and can guide the powdery anti-sticking agent into the mixing cylinder 31 through seamless steel pipes, etc.
[0060] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.
[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A recycled material buffer device for an asphalt mixing plant, characterized in that, include: The buffer silo (10) has a feed inlet at the top and a discharge mechanism (12) at the bottom; A gas collection hood (20) is provided above the feed inlet for connection with the flue gas treatment equipment; The mixing assembly (30) includes a mixing cylinder (31) and a driving mechanism (32). The mixing cylinder (31) is cylindrical and inclined in the vertical direction. The lower end of the mixing cylinder (31) is located above the feed inlet. A mixing chamber is formed inside the mixing cylinder (31). The mixing chamber passes through the upper and lower ends of the mixing cylinder (31) along its own axial direction and forms a mixing inlet and a mixing outlet (311) respectively. The driving mechanism (32) is used to drive the mixing cylinder (31) to rotate around its own central axis. A recycled material conveying assembly, wherein the discharge end of the recycled material conveying assembly extends from the mixing inlet into the mixing chamber; as well as An anti-sticking agent delivery assembly (50) is provided, wherein the discharge end of the anti-sticking agent delivery assembly (50) extends from the mixing inlet into the mixing chamber.
2. The asphalt mixing plant recycled material buffer device according to claim 1, characterized in that, The asphalt mixing plant recycled material buffer device further includes a support frame (60), the buffer silo (10), the air collection hood (20), the mixing cylinder (31), the driving mechanism (32), the recycled material conveying assembly and the anti-sticking agent conveying assembly (50) are respectively disposed on the support frame (60), and the mixing cylinder (31) is rotatably engaged with the support frame (60).
3. The asphalt mixing plant recycled material buffer device according to claim 2, characterized in that, The support frame (60) is provided with a support base (61), which is located on one side of the buffer hopper (10) and has an installation hole that is inclined downward toward the feed inlet. The outer wall of the mixing cylinder (31) is rotatably engaged with the inner wall of the installation hole.
4. The asphalt mixing plant recycled material buffer device according to claim 1, characterized in that, The coverage area of the gas collecting hood (20) is larger than the feed inlet. The outer periphery of the gas collecting hood (20) is also provided with a flexible curtain (21). The upper end of the curtain (21) is connected to the side wall of the gas collecting hood (20), and the lower end of the curtain (21) hangs freely to a height lower than the feed inlet.
5. A recycled material buffer device for an asphalt mixing plant according to claim 1, characterized in that, The gas collection hood (20) has an air inlet and a gas collection chamber connected to the air inlet. The air inlet is arranged facing downwards. A gas pipe (22) is connected to the top of the gas collection chamber. The gas pipe (22) is used to connect to the flue gas treatment equipment.
6. The asphalt mixing plant recycled material buffer device according to claim 1, characterized in that, The mixing cylinder (31) is provided with a gear ring (312) on its outer periphery. The gear ring (312) is formed by sequentially splicing multiple segmented racks. The driving mechanism (32) includes a drive motor (322) and a gear (321). The motor shaft of the drive motor (322) is connected to the gear (321) for transmission. The gear (321) meshes with the gear ring (312).
7. A recycled material buffer device for an asphalt mixing plant according to claim 1, characterized in that, The recycled material conveying assembly is one of a chute (40), a belt conveyor, or a screw conveyor. When the recycled material conveying assembly is a chute (40), the chute (40) is inclined downward along the material conveying direction.
8. A recycled material buffer device for an asphalt mixing plant according to claim 1, characterized in that, The anti-sticking agent delivery assembly (50) includes: Anti-stick storage container (51) for storing powdered anti-stick; and The discharge mechanism (52) is located at the bottom of the anti-sticking agent storage tank (51), and the discharge end of the discharge mechanism (52) extends from the mixing inlet into the mixing chamber.
9. A recycled material buffer device for an asphalt mixing plant according to claim 8, characterized in that, The discharge mechanism (52) is a screw unloader.
10. A recycled material buffer device for an asphalt mixing plant according to claim 1, characterized in that, The bottom of the buffer silo (10) has a conical collection section (11), and the unloading mechanism (12) is located at the bottom of the collection section (11).