An impeller feeder

Abstract

This utility model discloses an impeller feeder, including a support frame, a cylinder, a reducer, an impeller, and a coal receiving hopper. The support frame is fixed to the ground of the coal conveyor corridor and located above the coal discharge conveyor belt. The cylinder is fixed to the support frame and has a discharge port connected to a discharge channel located above the coal discharge conveyor belt. The cylinder is fixed to the support frame surface, and an impeller is located at the center of the bottom of the cylinder. The reducer and motor are mounted on the support frame and located below the cylinder. The output shafts of the reducer and motor pass through the central hole of the cylinder and are connected to the impeller. The coal receiving hopper is installed below the upper cover of the coal conveyor corridor and directly above the impeller. The coal feeding scheme of this impeller feeder involves feeding coal around the perimeter of the coal receiving hopper. The good flowability of the coal around the perimeter, combined with the continuous agitation of the impeller blades, prevents coal blockage.

Description

Technical Field

[0001] This utility model relates to coal conveying systems in thermal power plants and heat source plants, and in particular to an impeller feeder. Background Technology

[0002] Currently, in the coal conveying systems of small and medium-sized thermal power plants and heat source plants in China, vibrating feeders are commonly used to feed coal from the coal receiving hopper to the first-stage conveyor belt. The vibrating feeder works by vibrating the coal in the hopper to create an upward and forward thrust. When the coal has a high moisture content, the horizontal thrust is less than the upward thrust, resulting in poor coal flowability, clumping, and clogging the discharge port. This exceeds the feeder's load capacity, causing it to stop and cease feeding. At this point, the machine must be stopped, and all the coal in the upper hopper must be manually removed before the coal clumps on the bottom vibrating feeder can be cleared, which is time-consuming, labor-intensive, and disrupts normal production. Because coal prices are low and train wagons are easier to obtain in summer, most heating companies with the necessary resources currently source coal in the summer and store it in the open air. However, due to the heavy rainfall in summer, rainwater seeps into the coal piles, resulting in high moisture content. This makes it difficult to feed coal using a vibrating feeder, hindering normal production. Therefore, solving the problem of coal accumulation in the impeller feeder is particularly important. Utility Model Content

[0003] The purpose of this invention is to provide an impeller feeder that can prevent coal blockage in the coal receiving hopper due to high moisture content of the coal, reduce the labor intensity of workers, and ensure the normal operation of the coal conveying system.

[0004] To address the problems existing in the prior art, the technical solution adopted by this utility model is as follows:

[0005] An impeller feeder includes a support frame, a cylinder, a reducer, an impeller, and a coal receiving hopper. The support frame is fixed to the ground of a coal conveyor corridor and is located above the coal discharge conveyor belt of the corridor. The cylinder is fixed to the support frame and has a discharge port connected to a discharge channel located above the coal discharge conveyor belt. The cylinder is fixed to the support frame surface, and an impeller is located at the center of the bottom of the cylinder. The reducer and motor are mounted on the support frame and located below the cylinder. The output shafts of the reducer and motor pass through the central hole of the cylinder and are connected to the impeller. The coal receiving hopper is installed below the upper cover of the coal conveyor corridor and is located directly above the impeller.

[0006] Furthermore, the support includes a support surface and four support legs. The four support legs are fixed to the ground of the coal conveying corridor. The support surface is fixed to the support legs. The support surface includes a square frame, and two horizontal beams and two vertical beams are respectively arranged in the square frame.

[0007] Furthermore, the impeller includes a hexagonal sleeve and blade claws, the blade claws being detachably mounted on the hexagonal sleeve, the bottom end of the impeller not contacting the bottom of the cylinder, and the tip of the impeller not contacting the cylinder wall.

[0008] Furthermore, the cylinder includes a cylinder body, cylinder legs, and a feeding channel. The cylinder body has an opening at the upper end and a cylinder bottom at the lower end. The cylinder bottom is provided with two square feeding ports, which are symmetrically arranged on both sides of the hexagonal sleeve.

[0009] Furthermore, the cylinder legs are four in number, with their top ends symmetrically mounted on the cylinder bottom, and their bottom ends respectively fixed to the crossbeams of the support surface. Furthermore, the impeller is horizontally arranged, and the blade claws are either three or six in number.

[0010] Furthermore, the coal receiving hopper includes a main body and a coal discharge port. The main body has a truncated pyramidal structure, and the coal discharge port has a cubical structure. The coal discharge port extends into the cylinder and is located directly above the impeller. The bottom end of the coal discharge port does not contact the top end of the impeller.

[0011] Furthermore, the cross-section of the coal outlet is square.

[0012] The advantages and beneficial effects of this utility model are:

[0013] This utility model of an impeller feeder includes a support frame, a cylinder, a reducer, an impeller, and a coal receiving hopper. The support frame is fixed to the ground of the coal conveyor corridor and located above the coal discharge conveyor belt. The cylinder is fixed to the support frame and has a discharge port connected to a discharge channel located directly above the coal discharge conveyor belt. The impeller is located at the center of the bottom of the cylinder. The reducer and motor are mounted on the support frame and located below the cylinder. The output shafts of the reducer and motor pass through the central hole of the cylinder and are connected to the impeller. The coal receiving hopper is installed below the top cover of the coal conveyor corridor and directly above the impeller. This structure ensures that when coal falls into the coal receiving hopper, its landing point is located at the bottom of the cylinder between the coal receiving hopper's discharge port and the hexagonal sleeve. Even if the coal has a high moisture content, it will not clump together, and the material flow is good. The continuous movement of the impeller blades further prevents coal blockage. This structure ensures that material is fed outwards from the center of the blade claw, resulting in stable output, accurate metering, and strong versatility, making it particularly suitable for bulk raw coal. This impeller feeder can be used not only in thermal power plants but also at the receiving end of coal conveying systems in heat source plants, coking plants, and chemical industries. Attached Figure Description

[0014] Figure 1 This is an elevation view of the impeller feeder shown in Example 1;

[0015] Figure 2This is a plan view of the impeller feeder shown in Example 1. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Unless otherwise specified, the materials and reagents used in the following examples are commercially available. Example

[0018] like Figure 1 , 2 As shown, this embodiment provides an impeller feeder, including a support 2, a cylinder 4, a reducer and motor 5, an impeller 6, and a coal receiving hopper 3. The support 2 is fixed to the ground of the coal conveying corridor and located above the coal discharge conveyor belt 1 of the coal conveying corridor. The support 2 includes a support surface 21 and four support legs 22. The four support legs 22 are fixed to the ground of the coal conveying corridor. The support surface consists of two crossbeams and two longitudinal beams. The support surface 21 is fixed to the support legs 22. The support 2 is designed according to the steel structure design code GB50017-2003.

[0019] The cylinder 4 is fixed on the support 2. The cylinder 4 includes a cylinder body 41, four cylinder legs 42, and a feeding channel 43. The cylinder body 41 is open at the top and has a bottom. Two square feeding ports 44 are symmetrically arranged on the bottom, and the feeding ports 44 are connected to the feeding channel 43, which is located above the coal conveyor belt 1. The tops of the cylinder legs 42 are symmetrically installed on the bottom, and the bottoms of the four cylinder legs 42 are respectively fixed to the crossbeam of the support surface 21. An impeller 6 is arranged at the center of the bottom of the cylinder 4. The impeller 6 includes a hexagonal sleeve 61 and blade claws 62. The impeller 6 is horizontally arranged, and the blade claws 62 are installed on the hexagonal sleeve 61. Depending on the actual feeding amount, three or six blade claws can be selected. The feeding amount needs to match the output of the crusher in the coal conveying system. The coal feeding amount of the impeller feeder of this utility model is adjusted by changing the impeller speed through frequency conversion speed regulation. Variable frequency speed control is a conventional technology, typically involving an electronic belt scale, a frequency converter, and a PLC installed on the coal conveyor belt. By changing the power supply frequency of the motor, the rotational speed of the impeller is smoothly adjusted, thereby controlling the amount of coal output per unit time and achieving precise adjustment of the coal feed rate. The specific implementation of the variable frequency speed control and PLC automatic control components is well-known to those skilled in the art and can be achieved using conventional equipment, so it will not be elaborated here.

[0020] When a low feed rate is required, three blades can be used to reduce the coal feed rate of the impeller feeder, increase the impeller speed, and keep the motor speed within a more reasonable range. The impeller diameter is Φ2260 mm. The bottom surface of impeller 6 is 10-15 mm from the bottom of the cylinder. A 30 mm gap is provided between the tip of the blade and the cylinder wall. The bottom diameter of the cylinder is 2320 mm.

[0021] The impeller drive uses a standard product combining a reducer and a motor. The reducer and motor 5 are mounted on the bracket 2 and located below the cylinder 4. The output shaft of the reducer and motor 5 passes through the central hole at the bottom of the cylinder and is connected to the hexagonal sleeve 61, driving the impeller to rotate. The motor and reducer are directly connected. The motor power is configured according to the feeding range, which can achieve a feeding rate of 50-300 tons / hour.

[0022] The coal receiving hopper 3 is installed below the top cover of the coal conveying corridor. The coal receiving hopper 3 includes a main body 31 and a coal discharge port 32. The main body 31 has a truncated pyramidal structure, and the coal discharge port 32 has a cubical structure. The coal discharge port 32 extends into the cylinder and is located directly above the impeller. The bottom end of the coal discharge port is 20 mm away from the upper surface of the impeller blade. The coal discharge port 32 has a square cross-section with a side length of 1160 mm. When the impeller rotates under the drive of the geared motor, it pushes the coal between the coal discharge port and the cylinder wall into the discharge port at the bottom of the cylinder. The coal falls from the discharge port onto the coal discharge conveyor belt located below it, and is then transported to the next process. Traditional coal discharge port sizes are generally 700×500 mm, while the coal discharge port size of this invention is 1160×1160 mm. The increased coal discharge port size reduces the probability of coal blockage. There is a gap of about 150 mm between the coal outlet 32 ​​of the coal receiving hopper and the bottom of the cylinder. Calculated at a 45-degree stacking angle, the coal in the coal receiving hopper can only accumulate within the range of the coal outlet 1160 + stacking width 150 × 2 = 1460 mm. The diameter of the bottom of the cylinder is 2320 mm. The distance between the inner sides of the two discharge ports is about 1500 mm. When the impeller is not rotating, the coal will not fall into the discharge port 44 located at the bottom edge of the cylinder.

[0023] The working process of this utility model is as follows:

[0024] The loader dumps coal from the top cover of the coal conveyor corridor into the receiving hopper. The coal falls along the coal outlet 32 ​​into the bottom of the cylinder. The reducer and the motor in motor 5 are started. Driven by the reducer, the impeller begins to rotate. The blades push the coal into the discharge port 44 and fall along the discharge channel 43 onto the coal discharge conveyor. The coal discharge conveyor transports the coal to the next process.

[0025] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A rotary vane feeder, characterized by, The system includes a support (2), a cylinder (4), a reducer and motor (5), an impeller (6), and a coal receiving hopper (3). The support (2) is fixed on the ground of the coal conveying corridor and located above the coal conveying conveyor belt (1). The cylinder (4) is fixed on the support (2). The cylinder (4) is provided with a discharge port (44), which is connected to a discharge channel (43). The discharge channel (43) is located above the coal conveying conveyor belt (1). An impeller (6) is provided at the center of the bottom of the cylinder (4). The reducer and motor (5) are installed on the support (2) and located below the cylinder (4). The output shaft of the reducer and motor (5) passes through the center hole of the cylinder and is connected to the impeller (6). The coal receiving hopper (3) is installed below the top cover of the coal conveying corridor and located directly above the impeller (6).

2. A rotary vane feeder according to claim 1, wherein The support (2) includes a support surface (21) and four support legs (22). The support legs (22) are fixed on the ground of the coal conveying corridor. The support surface (21) is fixed on the support legs. The support surface (21) includes a square frame. Two horizontal beams and two vertical beams are respectively arranged in the square frame.

3. A rotary vane feeder as claimed in claim 1, wherein The cylinder (4) includes a cylinder body (41), cylinder legs (42) and a feeding channel (43). The cylinder body (41) has an opening at the upper end and a bottom at the lower end. Two square feeding ports (44) are symmetrically arranged on the bottom of the cylinder.

4. A rotary vane feeder according to claim 3, wherein The cylinder legs (42) consist of four pieces. The top ends of the cylinder legs (42) are symmetrically installed on the bottom of the cylinder, and the bottom ends of the cylinder legs (42) are fixed on the crossbeam of the support surface.

5. A rotary vane feeder as claimed in claim 1, wherein The impeller (6) includes a hexagonal sleeve (61) and a blade claw (62). The blade claw (62) is detachably mounted on the hexagonal sleeve. The bottom end of the impeller (6) does not contact the bottom of the cylinder, and the tip of the impeller does not contact the cylinder wall.

6. A rotary vane feeder according to claim 5, wherein The impeller (6) is horizontally arranged, and the blade claws are 6 or 3.

7. A rotary vane feeder as claimed in claim 1, wherein The coal receiving hopper (3) includes a main body (31) and a coal outlet (32). The main body (31) is a truncated pyramid structure, and the coal outlet (32) is a cubic structure. The coal outlet (32) extends into the cylinder (4) and is located directly above the impeller (6). The bottom end of the coal outlet (32) does not contact the top end of the impeller.

8. A rotary vane feeder according to claim 7, wherein The cross-section of the coal outlet (32) is square.

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