Feeding device for cement kiln

Abstract

The utility model provides a feeding device for a cement kiln, which comprises a measuring bin arranged at the tail of the cement kiln, a belt conveyor arranged on one side of the measuring bin, two top plates with semicircular structures arranged at the upper end in the measuring bin through a middle shaft, and a control box arranged in the measuring bin and positioned below the middle shaft, the two sides of the control box are each provided with a push rod used for supporting the top plate, a metering plate which is the same as the top plate in shape is arranged above the top plate, and a load sensor is arranged between the metering plate and the top plate. An opening at the lower end of the metering bin is connected with a spiral conveyor, and an overturning valve plate is mounted at an outlet of the spiral conveyor. Materials are accurately metered and then fed into the cement kiln, the materials can be rapidly released after entering the cement kiln, a feeding point is arranged nearby the position above tertiary air, the amount of air needed by volatile component combustion can be fully provided, and the CO concentration is prevented from being rapidly increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of cement kilns, and in particular relates to a feeding device for cement kilns. Background Art

[0002] The cement production process is a complex physical and chemical reaction process, especially the calcination process of cement clinker, which has obvious time lag, large inertia, nonlinearity and interference uncertainty. In order to ensure the quality of clinker, the reaction temperature of the cement clinker kiln system must be guaranteed.

[0003] Currently, when feeding cement kilns, the amount of material added is not accurate enough. Since there are many factors that affect the temperature of the kiln system during calcination, a slight deviation in control will cause wind pressure or thermal fluctuations, which will seriously affect the quality of the clinker. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a feeding device for a cement kiln, so as to achieve the purpose of feeding accurate amount of materials into the cement kiln. The technical solution adopted is as follows:

[0005] A feeding device for a cement kiln, comprising a metering bin arranged at the end of the cement kiln, a belt conveyor arranged on one side of the metering bin, two top plates of semicircular structure installed at the upper end of the metering bin through an intermediate shaft, a control box arranged inside the metering bin and below the intermediate shaft, a push rod for supporting the top plate arranged on both sides of the control box, a metering plate of the same shape as the top plate arranged above the top plate, and a load sensor arranged between the metering plate and the top plate;

[0006] The lower opening of the metering bin is connected to the screw conveyor, and a turnover valve plate is installed at the outlet of the screw conveyor. The turnover valve plate is controlled and connected to the control motor outside the screw conveyor through a transmission shaft.

[0007] Furthermore, a metering plate with the same shape as the flip valve plate is provided above the flip valve plate, and a load sensor is installed between the flip valve plate and the metering plate. A metering device is provided here to detect whether the weight of the material flowing out of the metering bin is the same as the weight of the material measured in the metering bin.

[0008] Furthermore, both ends of the push rod are movably connected to the control box or the top plate through a connecting seat, and the rotation of the top plate is controlled by the push rod. In order to prevent the top plate from rotating upward beyond the horizontal state, raised blocks are provided inside the metering bin and above the top plates on both sides.

[0009] Furthermore, a controller electrically connected to the load sensor and the push rod is provided inside the control box.

[0010] Furthermore, a mounting frame for installing an arch breaker is provided at the lower end of the metering bin. The arch breaker is connected to the interior of the metering bin through a pipeline. If arching and blockage occur in the process of material falling in the metering bin, the arch breaker can be used to clean and dredge the material.

[0011] Furthermore, the top plates on both sides can rotate 0-90 degrees with the middle axis as the center.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model accurately measures the materials before feeding them into the cement kiln, and releases them quickly after entering the cement kiln. The feeding point is arranged near the top of the tertiary air, which can fully provide the air required for the combustion of volatiles and avoid the rapid increase of CO concentration.

[0014] In order to ensure that the material fully falls from the top plate, the utility model can be provided with a vibrator in the control box, and the vibration can be transmitted to the top plate through the push rod to ensure that the material flowing out of the metering bin is the same as the measured value to avoid errors, and a metering device is also provided at the outlet of the screw conveyor to weigh the material again. If the weighing information does not match the weighing information of the metering device above the top plate, it proves that the material has arched and blocked in the metering bin, and the controller will start the arch breaker to clear the blocked position in the metering bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the connection structure between the push rod and the top plate of the utility model;

[0018] Figure 4 It is a schematic diagram of the connection structure of the flip valve plate of the utility model.

[0019] In the figure:

[0020] 1-belt conveyor, 2-metering bin, 21-top plate, 22-metering plate, 23-intermediate shaft, 24-load sensor, 3-mounting frame, 4-arch breaker, 5-screw conveyor, 6-control box, 7-push rod, 8-flip valve plate, 9-control motor. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0022] As attached Figure 1-4 shown.

[0023] A feeding device for a cement kiln comprises a metering bin 2 arranged at the tail of the cement kiln, a belt conveyor 1 is arranged on one side of the metering bin 2, and materials are transported to the metering bin 2 by the belt conveyor 1.

[0024] Two semicircular top plates 21 are installed at the upper end of the metering bin 2 via an intermediate shaft 23 . The top plates 21 can rotate 0-90 degrees with the intermediate shaft 23 as the center.

[0025] A control box 6 is provided inside the metering bin 2 and below the intermediate shaft 23. A push rod 7 for supporting the top plate 21 is provided on both sides of the control box 6. Both ends of the push rod 7 are movably connected to the control box 6 or the top plate 21 through a connecting seat.

[0026] A measuring plate 22 having the same shape as the top plate 21 is disposed above the top plate 21 , and a load sensor 24 is disposed between the measuring plate 22 and the top plate 21 .

[0027] A controller electrically connected to the load sensor 24 and the push rod 7 is provided inside the control box 6 .

[0028] A mounting frame 3 for mounting an arch breaker 4 is provided at the lower end of the metering bin 2 , and the arch breaker 4 is connected to the interior of the metering bin 2 through a pipeline.

[0029] A screw conveyor 5 is arranged below the metering bin 2 for conveying materials dropped in the metering bin 2. The screw conveyor 5 is a double-tube screw type. A flip valve plate 8 is installed at the outlet of the screw conveyor 5. The flip valve plate 8 is connected to the control motor 9 outside the screw conveyor 5 through a transmission shaft.

[0030] A metering plate 22 having the same shape as the overturn valve plate 8 is provided above the overturn valve plate 8 , and a load sensor 24 is installed between the overturn valve plate 8 and the metering plate 22 .

[0031] The working process is: use a forklift to load the materials, and convey the materials to the metering bin 2 through the belt conveyor 1. A metering device is provided at the upper end of the metering bin 2. The metering device measures separately and combines the statistics. The load sensor 24 measures the weight above the metering plates 22 on both sides respectively. The controller counts and calculates. When the combined weight reaches the set value, the belt conveyor 1 stops working; at the same time, the push rod 7 contracts, and the materials above the top plate 21 fall into the metering bin 2. In the process, in order to ensure that the materials fall fully from the top plate 21, a vibrator can be set in the control box 6, and the vibration can be transmitted to the top plate 21 through the push rod 7.

[0032] The fallen materials enter the screw conveyor 5. A metering device is also provided at the outlet of the screw conveyor 5 for weighing the materials again. If the weighing information does not match the weighing information of the metering device above the top plate 21, it proves that the materials are arched and blocked in the metering bin, and the controller will start the arch breaker 4.

[0033] After weighing, the flip valve plate 8 is opened by controlling the motor 9, and the material falls down. A belt conveyor with a large inclination angle can be set at the position where the material falls to transport the accurately measured material to the feeding point set in the cement kiln. The feeding point is set near the top of the tertiary air to provide the air required for the combustion of volatiles and avoid a rapid increase in CO concentration.

[0034] If arching and blockage occur in the process of material falling in the metering bin 2, the arch breaker 4 can be used to clean and dredge the material. The use of the arch breaker 4 is a relatively mature known technology, so there is no need to elaborate on it.

[0035] A metering device is also provided at the outlet of the screw conveyor 5 , which also has a metering plate 22 and an estimated load sensor 24 . Compared with the above-mentioned metering device, the metering plate 22 at this position has the same shape as the flip valve plate 8 .

[0036] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A feeding device for a cement kiln, comprising a metering bin (2) arranged at the end of the cement kiln, a belt conveyor (1) being arranged on one side of the metering bin (2), characterized in that: Two semicircular top plates (21) are installed at the upper end of the metering bin (2) via an intermediate shaft (23); a control box (6) is provided inside the metering bin (2) and below the intermediate shaft (23); a push rod (7) for supporting the top plate (21) is provided on both sides of the control box (6); a metering plate (22) having the same shape as the top plate (21) is provided above the top plate (21); and a load sensor (24) is provided between the metering plate (22) and the top plate (21); The lower opening of the metering bin (2) is connected to the screw conveyor (5), and a turnover valve plate (8) is installed at the outlet of the screw conveyor (5). The turnover valve plate (8) is controllably connected to a control motor (9) outside the screw conveyor (5) via a transmission shaft.

2. A cement kiln feeding device as claimed in claim 1, characterized in that: A metering plate (22) having the same shape as the flip valve plate (8) is also provided above the flip valve plate (8), and a load sensor (24) is installed between the flip valve plate (8) and the metering plate (22).

3. A cement kiln feeding device as claimed in claim 1, characterized in that: Both ends of the push rod (7) are movably connected to the control box (6) or the top plate (21) via connecting seats.

4. A cement kiln feeding device as claimed in claim 1, characterized in that: A controller electrically connected to the load sensor (24) and the push rod (7) is provided inside the control box (6).

5. A cement kiln feeding device as claimed in claim 1, characterized in that: A mounting frame (3) for mounting an arch breaker (4) is provided at the lower end of the metering bin (2); the arch breaker (4) is connected to the interior of the metering bin (2) via a pipeline.

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