Automatic sand discharging device at bottom of rotary furnace

Abstract

The utility model relates to an automatic sand discharging device at the bottom of a rotary furnace, which comprises a sand discharging door and a sand discharging door opening and closing mechanism, the sand discharging door is arranged at the bottom of a sand discharging hopper, the sand discharging door opening and closing mechanism comprises an air cylinder, the output end of the air cylinder is abutted against a rocker arm, the rocker arm is hinged on a hinge seat I, and the end part of the rocker arm is abutted against a balancing weight. The balancing weight is hinged to the second hinge seat through a connecting rod, and the sand discharging door is hinged to the second hinge seat. Sand dust is collected through the sand discharging hopper, the sand discharging door is opened regularly through the air cylinder, online automatic sand discharging is achieved, blowing-out cleaning is not needed, the production efficiency of equipment is improved, and the labor intensity of workers is reduced.

Description

An automatic sand removal device for the bottom of a rotary kiln Technical Field

[0001] This utility model belongs to the technical field of industrial furnace heat treatment, specifically relating to an automatic bottom sand discharge device for a rotary heat treatment furnace. Background Technology

[0002] The heat treatment of automotive engine components such as cylinder blocks and cylinder heads often employs rotary heat treatment furnaces to facilitate automated production and management. These components are made from casting blanks containing a large amount of molding sand. Although sand removal is performed, a significant amount of molding sand remains in the internal cavities, making complete removal difficult. During heating in the rotary heat treatment furnace, molding sand detached due to high temperatures continuously drains from the workpiece's internal cavity. Excessive accumulation of molding sand directly impacts the quality of the heat treatment and the furnace's lifespan. Because the furnace bed rotates during operation, it's difficult to install a sand removal device at the furnace bottom, resulting in the accumulation of sand that cannot be promptly discharged.

[0003] The common practice in the industry is to periodically shut down the furnace and manually clean it from the furnace door. This is labor-intensive, reduces equipment efficiency, increases production management difficulty, and consequently increases production costs. Therefore, developing an automatic sand removal device is a technical problem that urgently needs to be solved by those skilled in the art. This utility model is thus derived. Summary of the Invention

[0004] In view of the above-mentioned technical problems of the prior art, the purpose of this utility model is to provide an automatic sand removal device for the bottom of a rotary kiln, which has the advantages of simple structure and no need for manual cleaning during periodic shutdowns.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] An automatic sand discharge device for the bottom of a rotary kiln includes a sand discharge door and a sand discharge door opening and closing mechanism. The sand discharge door is located at the bottom of the sand discharge hopper. The sand discharge door opening and closing mechanism includes a cylinder. The output end of the cylinder abuts against a rocker arm. The rocker arm is hinged to a first hinge seat. The end of the rocker arm abuts against a counterweight. The counterweight is hinged to a second hinge seat via a connecting rod. The sand discharge door is hinged to the second hinge seat.

[0007] The rocker arm is equipped with a roller at its end, and the roller abuts against the bottom of the counterweight.

[0008] The rocker arm includes a first section and a second section that are integrally connected, and the included angle between the first section and the second section is an acute angle.

[0009] The automatic sand discharge device also includes a sand receiving vehicle, which is located below the sand discharge hopper.

[0010] Guide rods are installed on both sides of the sand receiving vehicle.

[0011] The front end of the sand receiving vehicle is equipped with a stop block.

[0012] The beneficial effects of this utility model are as follows:

[0013] This utility model relates to an automatic sand discharge device for the bottom of a rotary kiln. It collects sand and dust through a sand discharge hopper and periodically opens the sand discharge door via a cylinder, achieving automatic online sand discharge without requiring furnace shutdown for cleaning, thus improving equipment production efficiency and reducing worker labor intensity. A high-temperature resistant sealing strip is installed on the sand discharge door, ensuring a tight seal after closing under the weight of a counterweight, preventing leakage of hot air and sand. A sand receiving cart is installed below the sand discharge hopper, allowing sand particles discharged from the hopper to fall directly into the cart for convenient transportation and processing. Guide rods are installed on both sides of the sand receiving cart, and a stop block is installed at the front of the cart to fix its position, preventing the cart from interfering with the sand discharge door and the cylinder. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the structure of the sand discharge door in this utility model when it is open;

[0015] Figure 2 is a schematic diagram of the structure of the sand discharge door in this utility model when it is closed;

[0016] Figure 3 is a schematic diagram of the cross-sectional structure along the AA direction in Figure 2;

[0017] Among them, 1 is the sand discharge hopper, 2 is the sand discharge gate, 3 is the counterweight block, 4 is the second hinge seat, 5 is the cylinder, 6 is the rocker arm, 61 is the first section, 61 is the second section, 7 is the first hinge seat, 8 is the roller, 9 is the sand receiving car, 10 is the guide rod, 11 is the stop block, and 12 is the connecting rod. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0019] As shown in Figures 1-3, the automatic sand discharge device for the rotary kiln bottom of this utility model has a sand discharge hopper 1 in the shape of a funnel. A sand discharge door 2 and a sand discharge door opening and closing mechanism are installed at the bottom of the sand discharge hopper 1. The sand discharge door opening and closing mechanism includes a cylinder 5. The output end of the cylinder 5 abuts against a rocker arm 6. The end of the rocker arm 6 is provided with a roller 8. The rocker arm 6 is hinged to a hinge seat 7. The roller 8 abuts against a counterweight 3. The counterweight 3 is hinged to a hinge seat 4 via a connecting rod 12. The sand discharge door 2 is hinged to the hinge seat 4. At this time, the sand discharge door 2 and the counterweight 3 rotate around the hinge seat 4 to form a lever mechanism. The sand discharge door 2 is closed and pressed by the gravity of the counterweight 3.

[0020] Furthermore, the cylinder 5 in this utility model is installed on the ground, and the front end of the cylinder 5 is connected to the rocker arm 6. The rocker arm 6 includes a first section 61 and a second section 62 that are integrally connected. The roller 8 is installed at the end of the first section 61, and the included angle between the first section 61 and the second section 62 is an acute angle.

[0021] As shown in Figure 1, when the sand discharge door needs to be opened, the cylinder 5 extends and rotates the rocker arm 6 around the hinge seat 7. The roller 8 slowly lifts the counterweight 3, which in turn drives the sand discharge door 2 to rotate and open. The sand accumulated in the sand discharge hopper 1 inside the furnace falls into the sand receiving car 9 below, completing the sand discharge action.

[0022] As shown in Figure 2, after the sand discharge is completed, the cylinder 5 retracts, and the counterweight 3 slowly falls with the rocker arm 6, causing the sand discharge gate 2 to slowly close and tighten, and the counterweight 3 also stops rotating. The cylinder 5 continues to retract to the end point, causing the rocker arm 6 to continue to fall to the end point, and the roller 8 disengages from the counterweight 3. When the sand discharge hopper 1 and the sand discharge gate 2 rotate, they will not interfere with the rocker arm 6.

[0023] As shown in Figure 3, the automatic sand discharge device also includes a sand receiving car 9, which is located below the sand discharge hopper 1. Guide rods 10 are provided on both sides of the sand receiving car 9, and a stop block 11 is provided at the front end to fix the position of the sand receiving car 9.

[0024] This invention features sand discharge hoppers 1 evenly distributed on the rotary kiln bed. Each sand discharge hopper 1 has a sand discharge door 2 installed at its bottom. The sand discharge door 2 is connected by hinges, allowing it to open and close by flipping, and is closed and sealed by a counterweight 3. A cylinder 5 is installed on the bottom of the kiln to open and close the sand discharge door 2. At certain intervals, the cylinder automatically opens the sand discharge door 2, discharging the accumulated sand at the bottom of the rotary kiln into the sand receiving car 9. This invention has a simple structure, reliable sealing, and can operate automatically.

[0025] The above embodiments are only used to explain the inventive concept of this utility model, and are not intended to limit the protection of this utility model. Any non-substantial modifications made to this utility model using this concept should fall within the protection scope of this utility model.

Claims

1. An automatic sand removal device for the bottom of a rotary kiln, characterized in that: The device includes a sand discharge gate and a sand discharge gate opening and closing mechanism. The sand discharge gate is located at the bottom of the sand discharge hopper. The sand discharge gate opening and closing mechanism includes a cylinder. The output end of the cylinder abuts against a rocker arm. The rocker arm is hinged to a first hinge seat. The end of the rocker arm abuts against a counterweight. The counterweight is hinged to a second hinge seat via a connecting rod. The sand discharge gate is hinged to the second hinge seat.

2. The automatic sand removal device for the rotary kiln bottom as described in claim 1, characterized in that: The rocker arm is equipped with a roller at its end, and the roller abuts against the bottom of the counterweight.

3. The automatic sand discharging device of the rotary hearth furnace according to claim 1, characterized in that: The rocker arm includes a first section and a second section that are integrally connected, and the included angle between the first section and the second section is an acute angle.

4. The automatic sand discharging device of the rotary hearth furnace according to any one of claims 1 to 3, characterized in that: The automatic sand discharge device also includes a sand receiving vehicle, which is located below the sand discharge hopper.

5. The automatic sand discharging device of the rotary hearth furnace according to claim 4, characterized in that: Guide rods are installed on both sides of the sand receiving vehicle.

6. The automatic sand removal device for the rotary kiln bottom as described in claim 4, characterized in that: The front end of the sand receiving vehicle is equipped with a stop block.

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