Square billet continuous casting machine casting powder uniform adding device

Abstract

The utility model discloses a casting powder uniform adding device of a square billet continuous casting machine. The casting powder uniform adding device comprises a square billet crystallizer, a casting powder primary trough, a casting powder secondary trough and a powder adding device, two secondary casting powder troughs are symmetrically arranged below the primary casting powder trough; an electronic weighing scale is arranged in each casting powder secondary trough; a discharge port is formed in the bottom of each casting powder secondary trough, an air blowing feeding device is arranged at the discharge port, and a discharge electromagnetic valve is arranged at the joint of the air blowing feeding device and the discharge port; each blowing feeding device is connected with the slag adding device through a feeding pipe; by means of the ingenious arrangement of the slag adders, it is guaranteed that the four slag adding branch pipes are arranged above the four corners of the end face of the square billet crystallizer respectively, the uniformity of slag adding is guaranteed, a layer of magnesium refractory is additionally arranged on each slag adding branch pipe, and the situation that the primary slag adder and the secondary slag adder deform due to high-temperature baking of a submersed nozzle and molten steel, and slag adding is affected is prevented.

Description

Technical Field

[0001] This utility model relates to the field of protective slag for billet continuous casting machines, and in particular to a device for uniformly adding protective slag to billet continuous casting machines. Background Technology

[0002] During continuous casting, protective slag needs to be continuously added to the crystallizer. Currently, some steel mills use a traditional manual slag addition method, which is labor-intensive, results in inconsistent addition intervals and amounts of protective slag, and easily leads to unstable billet quality. Other steel mills use automatic or semi-automatic protective slag addition methods; however, because the billet crystallizer has a square or rectangular end face, the protective slag addition is concentrated at one point and cannot be evenly distributed across the entire end face. Furthermore, in actual use, the protective slag addition pipe is easily damaged and deformed by the molten steel. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a uniform slag addition device for a billet continuous casting machine, which addresses the shortcomings of the prior art. The device has a slag addition branch pipe above each of the four corners of the end face of the billet crystallizer to ensure the uniformity of slag addition. A layer of magnesium refractory material is added to the slag addition branch pipe to prevent the primary and secondary slag adders from being deformed by the submerged entry nozzle and the high temperature of the molten steel, which would affect the slag addition.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A device for uniformly adding protective slag to a billet continuous casting machine includes a billet crystallizer, a primary protective slag trough, a secondary protective slag trough, and a slag feeder.

[0006] Furthermore, two secondary protective slag troughs are symmetrically arranged below the primary protective slag trough.

[0007] Furthermore, the top of each secondary feed trough for protective slag is connected to the bottom of the primary feed trough for protective slag via a feed pipe, and the feed pipe is equipped with a feed solenoid valve.

[0008] Furthermore, each secondary feed trough for protective slag is equipped with an electronic weighing scale.

[0009] Furthermore, each secondary feed trough for protective slag is equipped with a discharge port at the bottom, and an air-blowing feeding device is installed at the discharge port. A discharge solenoid valve is installed at the connection between the air-blowing feeding device and the discharge port.

[0010] Furthermore, each air-blowing feeding device is connected to a slag feeder via a feeding pipe.

[0011] Furthermore, one of the air-blowing feeding devices is equipped with a primary slag feeder, which is located at the two corners of the side of the billet crystallizer near the feeding pipe.

[0012] Furthermore, another air-blowing feeding device is equipped with a secondary slag feeder, which is arranged at the two corners of the opposite side of the billet crystallizer.

[0013] In one embodiment, preferably, the primary slag feeder has a first slag feeding branch pipe and a second slag feeding branch pipe, the first slag feeding branch pipe and the second slag feeding branch pipe being V-shaped.

[0014] In one embodiment, preferably, the secondary slag feeder has a third slag feed branch pipe and a fourth slag feed branch pipe, which are U-shaped.

[0015] In one embodiment, preferably, a first spiral feeding device is arranged between the primary slag feeder and the corresponding feeding pipe.

[0016] In one embodiment, preferably, a second spiral feeding device is arranged between the secondary slag feeder and the corresponding feeding pipe.

[0017] In one embodiment, preferably, both the first spiral feeding device and the second spiral feeding device are provided with a support frame at their bottom, and the support frame is provided with an angle adjuster.

[0018] Furthermore, a control device is also provided, with both the feed solenoid valve and the discharge solenoid valve electrically connected to the control device.

[0019] Furthermore, an tundish is arranged above the billet crystallizer, and an immersion nozzle is arranged at the bottom of the tundish.

[0020] In one embodiment, preferably, a layer of magnesia refractory material is added to the outer peripheral wall of both the first slag-adding branch pipe and the second slag-adding branch pipe.

[0021] In one embodiment, preferably, a layer of magnesia refractory material is added to the outer peripheral wall of both the third and fourth slag-adding branch pipes.

[0022] This utility model has the following beneficial effects:

[0023] 1. A device for uniformly adding protective slag to a billet continuous casting machine, which can automatically and uniformly (quantitatively, timed, and at multiple points) add protective slag, has wide applicability, is simple and convenient to operate, and can reduce the intensity of manual labor.

[0024] 2. The primary slag feeder is arranged at the two corners of the side of the billet crystallizer closest to the feed pipe, and the secondary slag feeder is arranged at the two corners of the opposite side of the billet crystallizer. The primary and secondary slag feeders are simple, lightweight and easy to arrange. This ingenious arrangement can achieve uniform addition of protective slag at the four corners of the billet crystallizer, avoiding concentrated addition of protective slag at a single point and preventing the problem of uneven slag layer thickness.

[0025] 3. The primary slag feeder achieves uniform addition of protective slag at two points through the first and second slag feeder branches; the secondary slag feeder achieves uniform addition of protective slag at two points through the third and fourth slag feeder branches. With dual-pipe slag feeding, if one pipe fails, the other can still work normally, resulting in a high fault tolerance rate.

[0026] 4. Add a layer of magnesium refractory material to the slag feeding branch pipe to prevent the primary and secondary slag feeders from being deformed by the submerged nozzle and the high temperature of the molten steel, which would affect the slag feeding.

[0027] 5. In addition to the air-blowing feeding device, a screw feeding device is further installed to ensure the conveying effect of the slag material and further improve the quantitative / timed effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a device for uniformly adding protective slag to a billet continuous casting machine according to this utility model.

[0029] Figure 2 This is a schematic diagram of the arrangement of the primary and secondary slag feeders of a device for uniformly adding protective slag to a billet continuous casting machine according to this utility model.

[0030] The components include: 1. Primary feed trough for protective slag; 2. Feed pipe; 3. Secondary feed trough for protective slag; 4. Air blowing and feeding device; 5. Tundish; 6. Immersion nozzle; 7. Billet crystallizer; 8. Feed pipe; 9. Second spiral feeding device; 10. First spiral feeding device; 11. Support frame; 12. Primary slag feeder; 13. Secondary slag feeder. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0032] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," 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 utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0033] like Figure 1 As shown, a device for uniformly adding protective slag to a billet continuous casting machine includes a billet crystallizer 7, a primary protective slag trough 1, a secondary protective slag trough 3, and a slag feeder.

[0034] like Figure 1 As shown, the end face of the billet crystallizer 7 is square, specifically, the end face of the billet crystallizer is rectangular or square; an intermediate ladle 5 is arranged above the billet crystallizer, and an immersion nozzle 6 is arranged at the bottom of the intermediate ladle.

[0035] Furthermore, two secondary protective slag troughs 3 are symmetrically arranged below the primary protective slag trough 1.

[0036] Furthermore, the top of each secondary material trough for protective slag is connected to the bottom of the primary material trough for protective slag via a discharge pipe 2, and a feed solenoid valve is installed on the discharge pipe 2.

[0037] Furthermore, each secondary feed trough for protective slag is equipped with an electronic weighing scale.

[0038] Furthermore, a control device is also provided to strictly control the slag feeding process, ensuring that the protective slag is added evenly to the billet crystallizer at multiple points.

[0039] Furthermore, the feed solenoid valve is electrically connected to the control device.

[0040] like Figure 1 As shown, each electronic weighing scale is equipped with a corresponding feed solenoid valve to realize the timely and quantitative addition of protective slag into the billet crystallizer.

[0041] Specifically, the opening of the feed solenoid valve is adjusted according to different steel grades and different drawing speeds. The slag discharge speed is effectively controlled by the control device. The slag falls onto the electronic weighing scale. After the weighing target is reached, the feed solenoid valve is closed.

[0042] Preferably, considering the delay in the electronic weighing scale readings, in the initial stage of slag feeding, the control device controls the feeding solenoid valve to continuously feed slag at a certain opening. When the slag amount reaches 90% of the set value, the control device closes the feeding solenoid valve and waits for the electronic weighing scale readings to stabilize. Based on the stable readings, the control device controls the opening of the feeding solenoid valve and controls the slag feeding to reach the set value.

[0043] Furthermore, each secondary feed trough for protective slag is equipped with a discharge port at the bottom, and an air-blowing feeding device is installed at the discharge port. A discharge solenoid valve is installed at the connection between the air-blowing feeding device and the discharge port.

[0044] Furthermore, the discharge solenoid valve is electrically connected to the control device.

[0045] Specifically, after the electronic weighing scale reaches the set value, the control device opens the discharge solenoid valve and provides conveying power to the protective slag through the air blowing feeding device.

[0046] Furthermore, each air-blowing feeding device is connected to a slag feeder via a feeding pipe.

[0047] Furthermore, one of the blowing and feeding devices is equipped with a primary slag feeder 12, which is arranged at the two corners of the side of the billet crystallizer near the feeding pipe.

[0048] Furthermore, another air-blowing feeding device is equipped with a secondary slag feeder 13, which is arranged at the two corners of the opposite side of the billet crystallizer.

[0049] Specifically, the air-blowing feeding device is activated to transport the protective slag along the feeding pipe to the primary slag feeder and the secondary slag feeder. Furthermore, since the primary slag feeder is located at the two corners of the side of the billet crystallizer closest to the feeding pipe, and the secondary slag feeder is located at the two corners of the opposite side of the billet crystallizer, the protective slag can be uniformly added to the four corners of the billet crystallizer, avoiding concentrated addition of the protective slag at a single point and preventing the problem of uneven slag layer thickness.

[0050] In one embodiment, preferably, the primary slag feeder has a first slag feeding branch pipe and a second slag feeding branch pipe, which are V-shaped, and the protective slag is uniformly added at two points through the first and second slag feeding branch pipes.

[0051] In one embodiment, preferably, the secondary slag feeder has a third slag feeding branch pipe and a fourth slag feeding branch pipe, which are U-shaped, and the protective slag is uniformly added at two points through the third and fourth slag feeding branch pipes.

[0052] In one embodiment, preferably, a first spiral feeding device 9 is arranged between the primary slag feeder and the corresponding feeding pipe, and the first spiral feeding device conveys the slag to the first slag feeding branch pipe and the second slag feeding branch pipe respectively.

[0053] In one embodiment, preferably, a second spiral feeding device 10 is arranged between the secondary slag feeder and the corresponding feeding pipe, and the second spiral feeding device conveys the slag to the third slag feeding branch pipe and the fourth slag feeding branch pipe respectively.

[0054] In one embodiment, preferably, both the first spiral feeding device and the second spiral feeding device are provided with a support frame 11 at their bottom, and the support frame is provided with an angle adjuster.

[0055] Specifically, the support frame provides stable support for the primary slag feeder and the secondary slag feeder; the support frame is further equipped with an angle adjuster, which can adjust the angle position of the primary slag feeder and the secondary slag feeder according to actual needs, so as to improve the fit between the primary slag feeder and the secondary slag feeder and the four corners of the billet crystallizer, improve the convenience of slag feeding and make the uniformity effect better.

[0056] In one embodiment, preferably, a refractory protective layer is added to the outer peripheral wall of both the first slag-adding branch pipe and the second slag-adding branch pipe to prevent them from being scalded and deformed by the molten steel.

[0057] In one embodiment, preferably, a refractory protective layer is added to the outer peripheral wall of both the third and fourth slag-adding branch pipes to prevent them from being scalded and deformed by the molten steel.

[0058] Preferably, the refractory protective layer is made of magnesium refractory material.

[0059] The present application will be further described in detail below with reference to Embodiment 1 and the accompanying drawings: Example

[0060] For a high-carbon steel grade, at a casting speed of 2.7 m / min: 15 g of protective slag is added to each corner of the billet crystallizer every 30 seconds, and a total of 60 g of protective slag is added to each of the four corners each time.

[0061] like Figure 1 As shown, the protective slag enters the secondary hopper from the primary slag hopper by gravity. The opening of the feed solenoid valve is adjusted by the control device to effectively control the slag falling speed to 3.0 g / s. The slag falls onto the electronic weighing scale, and after reaching the weighing target, the feed solenoid valve closes.

[0062] Preferably, considering the delay in the electronic weighing scale reading, in the initial stage of slag feeding, the control device controls the feeding solenoid valve to continuously feed slag at a certain opening. When the slag amount reaches 90% of the set value (i.e., 27g), the control device closes the feeding solenoid valve and waits for the electronic weighing scale reading to stabilize. Based on the stable value, the control device controls the opening of the feeding solenoid valve and controls the slag feeding to reach the set value of 30g.

[0063] When the weighing reaches the set value and the timing reaches the set time, the control device controls the discharge solenoid valve to open. At the same time, the air blowing and feeding device starts to send the protective slag along the feeding pipe into the primary slag feeder or the secondary slag feeder.

[0064] Preferably, the protective slag is pushed into the first and second slag feeding branch pipes of the primary slag feeder by the first screw feeding device, and into the third and fourth slag feeding branch pipes of the secondary slag feeder by the second screw feeding device.

[0065] Specifically, such as Figure 2 As shown, the first and second slag-adding branch pipes are located at the two corners of the side of the billet crystallizer closest to the feed pipe; the third and fourth slag-adding branch pipes are located at the two corners of the opposite side of the billet crystallizer. That is, there is one slag-adding branch pipe at each of the four corners above the billet crystallizer, and the four slag-adding branch pipes simultaneously and evenly add slag.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A device for uniformly adding protective slag to a billet continuous casting machine, characterized in that: Includes a billet crystallizer, a primary protective slag trough, a secondary protective slag trough, and a slag feeder; Two secondary protective slag troughs are symmetrically arranged below the primary protective slag trough; The top of each secondary material trough for protective slag is connected to the bottom of the primary material trough for protective slag via a feeding pipe, and the feeding pipe is equipped with a feeding solenoid valve. Each secondary material tank for protective slag is equipped with an electronic weighing scale. Each secondary material trough for protective slag is equipped with a discharge port at the bottom, and an air-blowing feeding device is installed at the discharge port. A discharge solenoid valve is installed at the connection between the air-blowing feeding device and the discharge port. Each air-blowing feeding device is connected to the slag feeder via a feeding pipe; One of the air blowing and feeding devices is equipped with a primary slag feeder, which is located at the two corners of the side of the billet crystallizer near the feeding pipe. Another air-blowing feeding device is equipped with a secondary slag feeder, which is located at the two corners of the opposite side of the billet crystallizer.

2. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 1, characterized in that: The primary slag feeder has a first slag feed branch pipe and a second slag feed branch pipe, which are V-shaped.

3. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 1, characterized in that: The secondary slag feeder has a third slag feed branch pipe and a fourth slag feed branch pipe, which are U-shaped.

4. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 1, characterized in that: A first spiral feeding device is arranged between the primary slag feeder and the corresponding feeding pipe.

5. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 1, characterized in that: A second spiral feeding device is arranged between the secondary slag feeder and the corresponding feeding pipe.

6. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 4 or 5, characterized in that: Both the first and second spiral feeding devices are equipped with support frames at their bottoms, and angle adjusters are installed on the support frames.

7. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 1, characterized in that: It is also equipped with a control device, and the feed solenoid valve and the discharge solenoid valve are electrically connected to the control device.

8. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 1, characterized in that: An tundish is arranged above the billet crystallizer, and an immersion nozzle is arranged at the bottom of the tundish.

9. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 2, characterized in that: A layer of magnesia refractory material is added to the outer periphery of both the first and second slag-adding branch pipes.

10. The device for uniformly adding protective slag to a billet continuous casting machine according to claim 3, characterized in that: The outer periphery of both the third and fourth slag-adding branch pipes is reinforced with a layer of magnesia refractory material.

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