Uniform feeding device for expansion furnace

Abstract

This utility model relates to a uniform feeding device for an expansion furnace, comprising a furnace body, with a ring of feeding ports on the outer side of the middle part of the furnace body, each feeding port connected to a feeding pipe, and a feeding ring groove fixedly fitted on the outer side of the furnace body. The bottom of the feeding ring groove has two or more feeding funnels protruding downwards, evenly spaced around the circumferential of the feeding ring groove. The outlet of each feeding funnel is connected to the upper end of at least two feeding pipes. A uniform feeding ring groove is also fitted outside the furnace body, with an outlet on the bottom wall of the uniform feeding ring groove. The height of the part of the bottom wall of the uniform feeding ring groove at the outlet is lower than the height of the bottom wall of other parts. The opening of the uniform feeding ring groove is suspended below the output port of the elevator to receive materials. The furnace body is also provided with a drive mechanism to drive the uniform feeding ring groove to rotate circumferentially to align the outlet with each feeding funnel, so as to improve the uniformity of material heating and prevent pipe blockage, thereby improving product quality stability.

Description

Technical Field

[0001] This utility model relates to the field of perlite expansion production, specifically to a uniform feeding device for an expansion furnace. Background Technology

[0002] Expanded perlite is a natural acidic glassy volcanic lava, a non-metallic mineral, encompassing perlite, pitchstone, and obsidian, differing only in their water of crystallization content. Because it rapidly expands in volume 4 to 30 times under high-temperature conditions of 1000–1300℃, it is collectively referred to as expanded perlite. Expanded perlite can be used as a filter, catalyst, molecular sieve, and carrier for rubber, fertilizers, and pesticides. It is widely used in construction, metallurgy, petroleum, machinery, light industry, hydropower, casting, pharmaceuticals, food, agriculture, forestry, and horticulture.

[0003] An expansion furnace is a specialized piece of equipment for producing expanded perlite. For example, Chinese invention patent CN114608310B discloses an expanded perlite expansion furnace, which includes a feeding hopper, a drying furnace, an elevator, and the expansion furnace itself. The material enters the drying furnace through the feeding hopper for preheating and drying, is then lifted by the elevator, and enters the expansion furnace through a feeding pipe. The bottom of the expansion furnace is equipped with structures such as burners. To facilitate feeding, multiple discharge ports are arranged around the middle side wall of the expansion furnace, each connected to a furnace charge box above via a discharge pipe. In actual use, material is conveyed to each discharge port through the discharge pipe, and the material enters the furnace body through these ports, achieving uniform feeding.

[0004] However, in actual production, the above-mentioned feeding method has a fixed position because there is only one furnace charge box located at the output port of the elevator. As a result, the number of feeding pipes that can be connected to the bottom side of the furnace charge box is small, and the number of feed ports on the furnace body is reduced accordingly. The uniformity of feeding is still poor, and the material is sparsely distributed around the circumference of the furnace body, which affects the stability of subsequent production. At the same time, if more feeding pipes are added during the material conveying process, the size of the feeding pipes needs to be reduced to meet the integral connection with the furnace charge box. At this time, the inner diameter of each feeding pipe is small, which can easily lead to material jamming and accumulation, further affecting production efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a uniform feeding device for an expansion furnace, so as to solve the problem that the position of the furnace charge box in the existing expansion furnace is fixed, which makes it impossible to increase the number of feeding ports in a circumferential direction and affects the uniformity of feeding.

[0006] To solve the above problems, the expansion furnace uniform feeding device involved in this utility model adopts the following technical solution:

[0007] An expansion furnace uniform feeding device includes a furnace body. A ring of feeding ports is arranged around the outer side of the middle section of the furnace body. Each feeding port is connected to an upwardly extending feeding pipe. The feeding device also includes a feeding ring groove, which is fixedly fitted onto the outer side of the furnace body. The bottom of the feeding ring groove has two or more downward-protruding feeding funnels, evenly spaced around the circumferential distribution of the feeding ring groove. The outlet of each feeding funnel is connected to the upper end of at least two feeding pipes. A uniform feeding ring groove is also fitted outside the furnace body, rotatably mounted above the feeding ring groove. The bottom wall of the uniform feeding ring groove has an outlet. The height of the outlet portion of the bottom wall of the uniform feeding ring groove is lower than the height of other parts of the bottom wall. The opening of the uniform feeding ring groove is suspended below the output port of the elevator to receive material. A drive mechanism is also provided outside the furnace body to drive the uniform feeding ring groove to rotate circumferentially and align the outlet with each feeding funnel.

[0008] Furthermore, each feeding hopper is connected to at least three feeding pipes at its bottom, and the feeding ports corresponding to the at least three feeding pipes are evenly distributed circumferentially on the outer side of the furnace body.

[0009] Furthermore, the feeding port extends radially downward along the furnace body, and a feeding box is connected to the outside of each feeding port. The upper end of the feeding box has a connection port, and each feeding pipe is inserted vertically into the connection port.

[0010] Furthermore, a support is provided on the outside of the furnace body. The support has a first receiving ring and a second receiving ring arranged vertically. A vertical beam connects the first receiving ring and the second receiving ring. The material feeding ring groove is fixed on the first receiving ring, and the material equalization ring groove is rotatably assembled on the second receiving ring. The driving mechanism is set on the support.

[0011] Furthermore, the second receiving ring is provided with an annular groove guide rail, the outer periphery of the material equalization annular groove is provided with an annular groove guide groove, the driving mechanism includes an outer gear ring provided on the outer side of the material equalization annular groove, and also includes a reduction motor fixed on the vertical beam, the output end of the reduction motor is connected to a small gear that meshes with the outer gear ring for transmission.

[0012] Furthermore, the support is fixedly connected to the side wall of the furnace body by a radially extending crossbeam.

[0013] Furthermore, the discharge port is inserted downwards into the discharge ring groove.

[0014] Furthermore, the bottom wall of the material equalization ring groove gradually slopes downward from a position away from the discharge port to a position closer to the discharge port, and each slope position transitions smoothly.

[0015] Furthermore, the feeding pipe includes a rigid vertical pipe section at the bottom and a flexible pipe section at the top. The rigid vertical pipe section is fixedly connected to the feeding port, and the rigid vertical pipe section and the flexible pipe section are detachably connected.

[0016] The beneficial effects of this utility model are as follows: Compared with the prior art, the expansion furnace uniform feeding device designed in this utility model achieves uniform material distribution around the furnace body by setting a rotatable material distribution ring groove in conjunction with a multi-funnel feeding structure. Through the rotating action of a single receiving port, all feeding funnels are covered, maximizing the number of feeding ports without reducing the pipe diameter. Simultaneously, the rotating distribution method avoids long-term material accumulation in a single channel, reducing the risk of blockage. This allows each feeding channel to receive periodic replenishment, maintaining a stable material flow rate while increasing feeding density, balancing conveying efficiency and distribution uniformity. It has the advantages of improving material heating uniformity, preventing pipe blockage, and enhancing product quality stability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below:

[0018] Figure 1 This is a schematic diagram of a specific embodiment of the uniform feeding device for an expansion furnace according to this utility model.

[0019] Figure 2 for Figure 1 Enlarged view of a portion of the feeding device;

[0020] Figure 3 for Figure 1 Schematic diagram of the assembly structure of the feed pipe and furnace body;

[0021] Figure 4 for Figure 3 A half-section view;

[0022] Figure 5 for Figure 1 Schematic diagram of the structure of the feeding ring groove and connecting pipe;

[0023] Figure 6 for Figure 1 Schematic diagram of the structure of the uniform material ring groove;

[0024] Figure 7 for Figure 6 A half-section view;

[0025] Explanation of reference numerals in the attached drawings: 1-furnace body; 11-feeding port; 12-feeding box;

[0026] 2-Feeding pipe; 21-Rigid vertical pipe section; 22-Flexible pipe section;

[0027] 3-Discharge annular groove; 31-Discharge funnel;

[0028] 4-Pushing ring groove; 41-Discharge port; 42-External gear ring; 43-Guide groove;

[0029] 5-Support; 51-First receiving ring; 52-Second receiving ring; 53-Upright beam; 54-Crossbeam;

[0030] 6- Gear motor; 61- Pinion. Detailed Implementation

[0031] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Specific embodiments of the uniform feeding device for the expansion furnace involved in this utility model are as follows: Figures 1 to 7 As shown, the feeding device includes a furnace body 1. The structure of the furnace body 1 is basically the same as that of the prior art and will not be described in detail. It is formed by stacking and fixing a bottom base cylinder and an intermediate cylinder. A feeding port 11 is provided on the outer ring of the middle part of the furnace body 1. In this embodiment, there are twelve feeding ports 11, which are evenly distributed around the circumference of the furnace body 1. Each feeding port 11 is connected to an upwardly extending feeding pipe 2. The device also includes a feeding ring groove 3 and a material equalization ring groove 4, as well as a drive mechanism for driving the material equalization ring groove 4 to rotate.

[0033] Specifically, the feeding ring groove 3 is fixedly sleeved on the outside of the furnace body 1, and its bottom is provided with multiple downward-protruding, circumferentially distributed feeding funnels 31, each feeding funnel 31 being evenly distributed around the feeding ring groove 3 in a circumferential interval; each feeding funnel 31 is connected to at least two feeding pipes 2; the equalizing ring groove 4 is rotatably sleeved on the outside of the furnace body 1, and the bottom of the equalizing ring groove 4 is provided with a discharge port 41, the height of which is lower than the discharge ports 41 of other areas. The equalizing ring groove 4 is rotated by a drive motor so that the discharge port 41 is aligned with different feeding funnels 31 at a time. The feeding ring groove 3 is an annular material guiding structure, which can be composed of segmented welded steel plates to form an annular groove, used for the material distributed by the equalizing ring groove 4 to be diverted through the funnel structure. Its circumferentially distributed feeding funnels 31 can construct a multi-point feeding channel, solving the problem of uneven distribution caused by single-point material receiving. The material distribution ring trough 4 is a material distribution structure that can rotate around the furnace body 1. Specifically, it can be supported by an annular bracket 5 with rollers, or achieve circumferential rotation through guide rails. The material guiding structure is formed by the height difference of the bottom wall, and the lower discharge port 41 area forms a natural guiding slope to ensure that the material flows preferentially to the designated position. The drive mechanism can adopt a gear transmission or sprocket transmission system. By adjusting the orientation of the discharge port 41 through intermittent or continuous movement, the material distribution path can be dynamically adjusted to avoid local accumulation caused by fixed receiving.

[0034] In actual operation, the material output by the elevator first falls into the rotating material distribution ring trough 4. Due to the low bottom wall height of the discharge port 41 area, the material naturally gathers at this position under the action of gravity. When the drive mechanism drives the material distribution ring trough 4 to rotate, the discharge port 41 is aligned with each of the discharge funnels 31 of the discharge ring trough 3 in sequence. The material is diverted through the discharge funnels 31 to the corresponding multiple discharge pipes 2. Each discharge pipe 2 conveys the material to the various discharge ports 11 distributed around the furnace body 1, forming a ring array feeding mode. By adjusting the rotation speed of the material distribution ring trough 4, the distribution frequency of the material in each discharge channel can be controlled.

[0035] The aforementioned discharge port 41 is inserted into the feeding ring groove 3. The discharge port 41 on the bottom wall of the equalizing ring groove 4 extends to form a vertically downward tubular structure, with its end embedded in the annular space at the top of the feeding ring groove 3. When the material falls from the discharge port 41 of the equalizing ring groove 4, it directly enters the enclosed space of the feeding ring groove 3, and is then evenly distributed to each feeding pipe 2 through the feeding funnel 31. This nested structure can eliminate the height difference of the material during the transfer process and prevent the material from scattering due to airflow disturbance.

[0036] To meet the structural design requirements of the discharge port 41, the bottom wall of the material distribution ring trough 4 gradually slopes downwards from a position away from the discharge port 41 to a position closer to the discharge port 41, with smooth transitions at each slope position. This can be achieved using an arc transition or a gradually changing slope connection. This design can prevent material from stagnating due to collisions with sharp edges during flow. During the circumferential rotation of the material distribution ring trough 4, the inclined extension structure of the bottom wall allows the material to slide along the inclined surface towards the discharge port 41 under the combined action of centrifugal force and gravity. When the rotation of the material distribution ring trough 4 aligns the discharge port 41 with different feeding funnels 31, the smooth transition characteristics of the inclined bottom wall ensure a continuous material flow path, avoiding material accumulation or flow interruption due to sudden changes in local height. After the material falls from the discharge port 41 of the material distribution ring trough 4 into the corresponding feeding funnel 31 of the feeding ring trough 3, it is dispersed to the feeding ports 11 of the furnace body 1 through the feeding pipe 2. This ensures that the material always converges towards the discharge port 41 along the optimal path during rotation, while eliminating obstacles in the flow path and avoiding local accumulation.

[0037] Preferably, in this embodiment, each feeding funnel 31 is connected to three feeding pipes 2 at its bottom, and the corresponding feeding ports 11 of each of the three feeding pipes 2 are evenly distributed circumferentially on the outer side of the furnace body 1. There are four corresponding feeding funnels 31, evenly distributed circumferentially. The aforementioned feeding funnels 31 are inverted conical structures used to concentrate materials, and are used to divert the materials output from the equalizing ring groove 4 into multiple feeding pipes 2. The feeding ports 11 are holes with the same spacing opened on the side wall of the furnace body 1, so that the material forms a continuous and uniform annular distribution zone within the furnace body 1.

[0038] After the material enters a feeding hopper 31, it is simultaneously conveyed into the furnace body 1 by three feeding pipes 2 below. Since the feeding ports 11 corresponding to the three feeding pipes 2 are evenly distributed in the circumferential direction, the material will form three equidistant distribution points in the circumference when it enters the furnace body 1 through the feeding pipes 2. When the drive mechanism drives the material equalization ring trough 4 to rotate, the discharge port 41 rotates in turn opposite different feeding hoppers 31, so that the three feeding pipes 2 of each feeding hopper 31 convey material to the furnace body 1 at different times, and finally form a continuous and uniform material coverage area inside the furnace body 1. This multi-pipe synchronous conveying method avoids the problem of pipe diameter reduction caused by excessive single-pipe conveying capacity, and eliminates material accumulation dead corners through spatial distribution optimization. Connecting a single feeding hopper 31 to at least three feeding pipes 2 and evenly distributing their corresponding feeding ports 11 increases the material input point density by more than three times under the same spatial conditions. Meanwhile, because the three feed pipes 2 can maintain a large diameter, material conveying will not be blocked due to insufficient pipe diameter, thus improving the uniformity of distribution while maintaining conveying efficiency. This effectively solves the problem of uneven material distribution caused by insufficient number of feed ports 11 in the expansion furnace. Through multi-pipe synchronous conveying and uniform distribution design, the material forms a continuous covering layer within the furnace body 1, avoiding material loss in localized areas. Furthermore, the larger diameter feed pipes 2 ensure the continuity of material conveying, preventing blockages caused by insufficient pipe diameter, and significantly improving the processing stability of the expansion furnace.

[0039] In addition, in this embodiment, to achieve stable material feeding, the feeding port 11 extends radially downwards at an angle along the furnace body 1. Each feeding port 11 is connected to a feeding box 12 on its outer side. The upper end of the feeding box 12 has a connection port, and each feeding pipe 2 is vertically inserted into the connection port. When material is conveyed through the feeding pipe 2, the angled feeding port 11 prevents material accumulation at the inlet. The feeding box 12 acts as a transition structure, spatially decoupling the vertical feeding pipe 2 from the angled feeding port 11. The connection port of the feeding box 12 and the feeding pipe 2 form an axially aligned assembly relationship, allowing material to directly enter the feeding port 11 under gravity without changing its flow direction. This structure allows feeding ports 11 at different angles to be connected using a standardized vertical feeding pipe 2. For example, when the diameter of the furnace body 1 changes, only the installation angle of the feeding box 12 needs to be adjusted without redesigning the feeding pipe 2. This design effectively solves the material jamming problem that occurs when the traditional feeding pipe 2 is connected to the inclined feeding port 11. Through spatial decoupling design, the feeding pipe 2 is kept vertical at all times, avoiding increased frictional resistance of the pipe wall due to angular deviation. The feeding box 12, as a transition structure, not only ensures the connection seal but also provides a unified interface standard for furnace bodies 1 of different sizes and specifications, significantly improving equipment maintenance efficiency.

[0040] In this embodiment, to achieve the fixed installation of the material distribution ring groove 4 and the material discharging ring groove 3, a support 5 is provided on the outer side of the furnace body 1. The support 5 has a first receiving ring 51 and a second receiving ring 52 arranged vertically. A vertical beam 53 connects the first receiving ring 51 and the second receiving ring 52. The material discharging ring groove 3 is fixed on the first receiving ring 51, and the material distribution ring groove 4 is rotatably assembled on the second receiving ring 52. The drive mechanism is set on the support 5. The support 5 is a frame structure for fixing and supporting the material discharging ring groove 3 and the material distribution ring groove 4. Specifically, it can be implemented by welding metal profiles or bolting, to ensure the relative position stability of the material discharging ring groove 3 and the material distribution ring groove 4. The support 5 fixes the material discharging ring groove 3 through the first receiving ring 51 to keep it in a horizontal state and avoid displacement due to gravity or vibration; the second receiving ring 52 assembles the material distribution ring groove 4 through a ring groove guide rail or bearing structure, so that it can rotate around the furnace body 1. The drive mechanism rotates the material distribution ring trough 4 via gear or chain transmission, aligning the discharge port 41 at the bottom of the material distribution ring trough 4 with each discharge funnel 31 in sequence, thus achieving uniform material distribution. The upright beam 53, as a supporting component connecting the upper and lower receiving rings, can distribute the load and reduce the deformation of the support 5, ensuring the stability of the material distribution ring trough 4 during rotation.

[0041] Specifically, to ensure stable driving of the material distribution ring trough 4, the second receiving ring 52 is equipped with a ring groove guide rail, and the outer circumference of the material distribution ring trough 4 is equipped with a ring groove guide groove 43. The driving mechanism includes an external gear ring 42 located on the outer side of the material distribution ring trough 4, and a reduction motor 6 fixed on the vertical beam 53. The output end of the reduction motor 6 is connected to a pinion 61 that meshes with the external gear ring 42. The guide rail of the second receiving ring 52 provides sliding support for the circumferential rotation of the material distribution ring trough 4. The external gear ring 42 can be composed of separate gear rings. In actual operation, the reduction motor 6 drives the pinion 61 to rotate through its output shaft. The pinion 61 meshes with the external gear ring 42, causing the material distribution ring trough 4 to rotate circumferentially along the guide rail of the ring groove. This allows the discharge port 41 of the bottom wall of the material distribution ring trough 4 to align sequentially with each discharge funnel 31. The cooperation between the guide rail and the guide groove 43 restricts the radial offset of the material distribution ring trough 4, ensuring accurate positioning of the discharge port 41 and the discharge funnel 31 during rotation. Preferably, the support 5 is fixedly connected to the side wall of the furnace body 1 via radially extending crossbeams 54. One end of the crossbeam 54 is welded to the side wall of the furnace body 1, and the other end is welded to the vertical beam 53 or the receiving ring of the support 5. When the elevator conveys material to the material distribution ring trough 4, the load borne by the support 5 is distributed to the side wall of the furnace body 1 through the crossbeams 54, avoiding the deformation problem caused by uneven stress in traditional independent support structures. The radial layout of the crossbeams 54 makes the support 5 and the furnace body 1 form an integral rigid frame, effectively suppressing the impact of vibration on the position of the feed pipe 2.

[0042] To facilitate the assembly of the feeding pipe 2, in this embodiment, the feeding pipe 2 includes a rigid vertical pipe section 21 at the bottom and a flexible pipe section 22 at the top. The rigid vertical pipe section 21 is fixedly connected to the feeding port 11, and the rigid vertical pipe section 21 and the flexible pipe section 22 are detachably connected. The rigid vertical pipe section 21 can be implemented by welding a stainless steel pipe to the outside of the feeding port 11 of the furnace body 1, ensuring the stability of the connection with the high-temperature furnace body 1. The flexible pipe section 22 can be a tubular structure made of high-temperature resistant elastic material, specifically a corrugated metal hose or a ceramic fiber braided tube, facilitating adaptation to different extension directions of the feeding port 11. The segmented structure maintains connection stability through the rigid section and absorbs deformation through the flexible section, extending the overall service life. In the prior art, replacing the entire feeding pipe 2 requires dismantling the furnace body 1 connection structure. This solution achieves partial maintenance through detachable connection, significantly reducing maintenance costs.

[0043] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. An even discharging device for an expansion furnace, comprising a furnace body, a circle of discharging ports is arranged outside the middle part of the furnace body, and each discharging port is connected with a discharging pipe extending upwardly, characterized in that, The feeding device also includes a feeding ring groove, which is fixedly sleeved on the outside of the furnace body. The bottom of the feeding ring groove has a downwardly protruding feeding funnel. There are two or more feeding funnels, which are evenly distributed around the circumferential of the feeding ring groove. The discharge port of each feeding funnel is connected to the upper end of at least two feeding pipes. The furnace body is also fitted with a material equalization ring groove that is rotatably mounted above the feeding ring groove. The bottom wall of the material equalization ring groove has a discharge port. The height of the bottom wall of the material equalization ring groove at the discharge port is lower than the height of the bottom wall of other parts. The opening of the material equalization ring groove is suspended below the output port of the elevator to receive materials. The furnace body is also provided with a drive mechanism to drive the material equalization ring groove to rotate circumferentially to align the discharge port with each feeding funnel.

2. The uniform downer device of the expansion furnace according to claim 1, wherein, Each feeding hopper is connected to at least three feeding pipes at its bottom, and the feeding ports corresponding to the at least three feeding pipes are evenly distributed circumferentially on the outer side of the furnace body.

3. The uniform feeding device for the expansion furnace according to claim 2, characterized in that, The feeding port extends radially downward along the furnace body, and a feeding box is connected to the outside of each feeding port. The upper end of the feeding box has a connection port, and each feeding pipe is inserted vertically into the connection port.

4. The uniform downer device of an expansion furnace according to claim 1, wherein The furnace body is provided with a support frame, which has a first receiving ring and a second receiving ring arranged vertically. A vertical beam connects the first receiving ring and the second receiving ring. The material feeding ring groove is fixed on the first receiving ring, and the material equalization ring groove is rotatably assembled on the second receiving ring. The driving mechanism is set on the support frame.

5. The uniform downer device of the expansion furnace according to claim 4, wherein, The second receiving ring is provided with a ring groove guide rail, and the outer periphery of the material equalization ring groove is provided with a ring groove guide groove. The driving mechanism includes an outer gear ring disposed on the outer side of the material equalization ring groove, and also includes a reduction motor fixed on the vertical beam. The output end of the reduction motor is connected to a small gear that meshes with the outer gear ring for transmission.

6. The uniform downer device of the expansion furnace according to claim 4, wherein The support is fixedly connected to the side wall of the furnace body by a radially extending crossbeam.

7. The uniform downer device of an expansion furnace according to claim 1, wherein The discharge port is inserted downwards into the discharge ring groove.

8. The uniform downer device of the expansion furnace according to claim 7, wherein The bottom wall of the material equalization ring groove gradually slopes downward from the position away from the discharge port to the position closer to the discharge port, and the slope transitions smoothly at each position.

9. The uniform downer device of an expansion furnace according to claim 1, wherein The feeding pipe includes a rigid vertical pipe section at the bottom and a flexible pipe section at the top. The rigid vertical pipe section is fixedly connected to the feeding port, and the rigid vertical pipe section and the flexible pipe section are detachably connected.

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