A device and method for removing a cold-type inner cavity protection slag

Abstract

This invention discloses a device and method for removing protective slag from the inner cavity of a cold mold, belonging to the field of casting technology. It includes a movable rotating table for supporting the cold mold and a slag removal device with a temperature sensing component, controlled by a reciprocating rocking mechanism, capable of extending into the inner cavity of the cold mold. The rotating table is equipped with rotating wheels located on both sides of the cold mold and driving it to rotate around its central axis, as well as an automatic striking device that moves along the length of the cold mold and strikes it. The relative movement between the rotating table and the slag removal device, the rotation of the rotating wheels, and the movement of the automatic striking device along the length of the cold mold are all controlled by a control mechanism. This invention can replace manual labor in repeatedly heating and striking the areas where protective slag adheres to the inner cavity of the cold mold, saving manpower, improving slag removal efficiency, and achieving ideal slag removal results.

Description

Technical Field

[0001] This invention belongs to the field of casting process technology, specifically relating to a device and method for removing protective slag from the inner cavity of a cold mold. Background Technology

[0002] After the outer layer of a large centrifugal rolling mill is cast, a protective slag needs to be added to the inner cavity to prevent oxidation. Due to the large shrinkage, the molten steel shrinks differently in the cold mold and the upper end cap, which can easily cause tearing at this location. After solidification, the cold mold is placed upright in the kiln. During the casting of the core, the protective slag can seep into the space between the cold mold and the blank along the tear between the end cap and the cold mold. After the kiln is opened, solidified protective slag remains on the inner cavity of the cold mold. Because the inner cavity of the cold mold has a certain depth of threads, the molten protective slag will remain in the threads. Before the cold mold is preheated in the kiln for the next time, the protective slag in the inner cavity must be completely removed. In most cases, the cleaning operation is carried out manually using various tools, which is difficult, time-consuming and labor-intensive. However, if the mold is heated as a whole to remove the protective slag, the protective slag inside the mold is heated together with the mold and softens, but it will adhere to the inner wall after cooling. Therefore, it is impossible to remove it by heating as a whole. In particular, the protective slag remains in the thread line. Conventional removal methods are very time-consuming and labor-intensive. Therefore, there is an urgent need for a device and method for removing the protective slag in the inner cavity of the mold that can replace manual repeated local heating of the adhered protective slag. Summary of the Invention

[0003] The purpose of this invention is to provide a device and method for removing cold-type internal cavity protective residue, which can replace manual labor in repeatedly heating and tapping the location where the protective residue adheres until the protective residue falls off.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A device for removing protective slag from the inner cavity of a cold mold includes a rotating platform that can move relative to the cold mold and a slag removal device equipped with a temperature sensing component that can extend into the inner cavity of the cold mold and is controlled by a reciprocating swing mechanism. The rotating platform is provided with rotating wheels located on both sides of the cold mold and driving the cold mold to rotate. The slag removal device is mounted on a displacement device via the reciprocating swing mechanism and is arranged in a front-to-back correspondence with the cold mold on the rotating platform. The relative movement between the rotating platform and the slag removal device, as well as the rotation of the rotating wheels, are controlled by a control mechanism.

[0006] A further improvement of the technical solution of the present invention is that: an automatic striking device that moves along the length of the cold mold and strikes the cold mold is also provided on the rotating table; the movement of the automatic striking device along the length of the cold mold is controlled by a control mechanism, and the slag removal device moves forward or backward relative to the cold mold through a displacement device controlled by the control mechanism.

[0007] A further improvement of the technical solution of the present invention is that: the reciprocating swing mechanism includes a speed reducer motor with a speed regulator installed on the displacement device and a crank connecting rod controlled by the speed reducer motor; the slag removal device is connected to the crank connecting rod through an adjustable telescopic shaft.

[0008] A further improvement of the technical solution of the present invention is that the displacement device includes a bracket disposed at the bottom of a reduction motor and symmetrically arranged slide rails. The bracket is disposed on the slide rails by a positioning slider, and the positioning slider is engaged on the slide rails and can slide along the slide rails.

[0009] A further improvement of the technical solution of the present invention is that: the slag removal device is a temperature-adjustable water welding gun, and a temperature probe is provided on one side of the water welding gun. The angle between the temperature probe and the water welding gun is smaller than the swing angle of the water welding gun controlled by the reciprocating swing mechanism.

[0010] A further improvement of the technical solution of the present invention is that: the automatic tapping device is set on the cold side by a guide device controlled by the control mechanism, including a ratchet controlled to rotate by a second reduction motor and a connecting rod with a tapping component at one end and the other end engaging with the ratchet.

[0011] A further improvement of the technical solution of the present invention is that: the connecting rod is mounted on two support rods by means of a pin and rotates on the pin under the drive of the ratchet; the part of the connecting rod below the pin is connected to the two support rods by return springs respectively.

[0012] A further improvement of the technical solution of the present invention is that the guiding device includes a guide rod set on a rotary table, a guide tube set on the guide rod and moving along the length direction of the guide rod, and a support set on the guide tube. Both support rods and the reduction motor are set on the support.

[0013] A method for removing protective slag from the inner cavity of a cold mold, comprising the following steps: (The method involves using a removal device to remove the protective slag adhering to the inner cavity of the cold mold.)

[0014] Step S1: Hoist the cold mold with the protective slag adhering to it onto the rotating wheel of the rotary table to cool it to room temperature, and determine the location in the inner cavity of the cold mold that needs to be deslag removed;

[0015] Step S2: Start the displacement device to move the welding torch forward and insert it into the cold mold cavity;

[0016] Step S3: Adjust the telescopic shaft so that the water welding gun at the front end of the telescopic shaft reaches the axial position of the area to be deslag removed;

[0017] Step S4: Start the rotating wheel to drive the cold mold to rotate around the central axis, thereby adjusting the area to be descaled to a position where the water welding gun can swing and heat to cover it while waiting for descaling;

[0018] Step S5: Start the geared motor and the welding torch and adjust the speed controller to control the reciprocating swing speed of the welding torch. Monitor the temperature of the area to be descaled by the temperature probe. Adjust the welding torch to the appropriate temperature based on the data fed back by the temperature probe and drive the welding torch to reciprocate to heat the area to be descaled until the protective slag falls off.

[0019] Step S6: For other areas where protective slag adheres, perform localized and repeated heating as per steps S3-S5. If there is any protective slag that has not completely detached, use a rotating wheel driven by a cold type and a movable automatic tapping device to repeatedly tap the areas where the protective slag has not completely detached until the protective slag is completely detached.

[0020] A further improvement to the technical solution of the present invention is that, in step S5, the operation method of the water welding gun includes the following steps:

[0021] S501: Start the acetylene gas in the water welding gun, adjust the flame to a carbonization flame to preheat the area to be descaled, and turn on the oxygen to increase the air volume.

[0022] S502: The reciprocating heating range of the water welding gun should be controlled within 300*300mm for 15-20 seconds. When the temperature reaches 700-1000℃, the protective slag will fall off. If the thicker protective slag does not fall off, use the automatic tapping device in step 6 to tap it until it falls off completely.

[0023] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0024] This application discloses a device for removing protective slag from a cold-type inner cavity. This device can replace manual labor by repeatedly heating and tapping the location where protective slag adheres to the cold-type inner cavity, saving manpower, improving slag removal efficiency, and achieving ideal slag removal results.

[0025] The reciprocating swing mechanism and displacement device used in this invention enable the welding torch to be inserted into the inner cavity of the cold mold and then locally and repeatedly heated at the location where the protective slag adheres.

[0026] The adjustable telescopic shaft and rotating wheel used in this invention enable the welding torch to be quickly aligned with the area to be slag removed after being inserted into the cold mold cavity, thus improving operating efficiency.

[0027] The movable automatic tapping device used in this invention works in conjunction with a rotating wheel to tap the cold mold even when the protective slag has not completely fallen off, thus ensuring an ideal slag removal effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the cold-type inner cavity protective slag removal device of the present invention;

[0029] Figure 2 This is a schematic diagram of the automatic tapping device of the present invention;

[0030] Among them, 1. Cold type, 2. Rotary table, 3. Rotating wheel, 4. Automatic striking device, 5. Gear motor one, 6. Telescopic shaft, 7. Bracket, 8. Slide rail, 9. Positioning slider, 10. Welding gun, 11. Temperature probe, 12. Guide rod, 13. Guide tube, 14. Support, 4-1. Gear motor two, 4-2. Ratchet, 4-3. Striking component, 4-4. Connecting rod, 4-5. Support rod. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to embodiments:

[0032] like Figure 1 As shown, a device for removing protective slag from the inner cavity of a cold mold includes a rotating table 2 that can move relative to the cold mold 1 and a slag removal device with a temperature sensing component that can extend into the inner cavity of the cold mold 1 and is controlled by a reciprocating rocking mechanism. The rotating table 2 is equipped with rotating wheels 3 located on both sides of the cold mold 1 and driving the cold mold 1 to rotate around its central axis, and an automatic striking device 4 that moves along the length of the cold mold 1 and strikes the cold mold 1. The relative movement between the rotating table 2 and the slag removal device, the rotation of the rotating wheels 3, and the movement of the automatic striking device 4 along the length of the cold mold 1 are all controlled by a control mechanism.

[0033] The slag removal device is mounted on the displacement device via a reciprocating swing mechanism and is positioned in a corresponding manner to the cold mold 1 on the rotary table 2. The slag removal device moves forward or backward relative to the cold mold 1 via the displacement device controlled by a control mechanism. The control mechanism can be a generator, pneumatic device, or hydraulic device that works in conjunction with the transmission mechanism, or other mechanisms that can provide power to the displacement device. The transmission mechanism can be a gear and rack structure, a worm gear structure, a lead screw structure, or other structures with transmission functions.

[0034] The reciprocating rocking mechanism includes a geared motor 5 with a speed regulator mounted on the displacement device and a crank-connecting rod structure controlled by the geared motor 5. The slag removal device is connected to the crank-connecting rod through an adjustable telescopic shaft 6.

[0035] The displacement device includes a bracket 7 installed at the bottom of the geared motor 5 and symmetrically arranged slide rails 8. The bracket 7 is mounted on the slide rails 8 via positioning sliders 9. The positioning sliders 9 are engaged with the slide rails 8 and can slide along the slide rails 8.

[0036] The slag removal device is a temperature-adjustable water welding torch 10. A temperature probe 11 is provided on one side of the water welding torch 10. The angle between the temperature probe 11 and the water welding torch 10 is smaller than the swing angle of the water welding torch 10 controlled by the reciprocating swing mechanism. When the water welding torch 10 swings and heats the area to be slag removed, the temperature probe 11 can monitor the temperature of the heated area to ensure that the water welding torch maintains a suitable temperature.

[0037] like Figure 2 As shown, the automatic tapping device 4 is set on one side of the cold mold 1 via a guide device controlled by a control mechanism. It includes a ratchet 4-2 controlled to rotate by a geared motor 4-1, and a connecting rod 4-4 with a tapping component 4-3 at one end and meshing with the ratchet 4-2 at the other end. The connecting rod 4-4 is mounted on two support rods 4-5 via pins and rotates on the pins under the drive of the ratchet 4-2. The portion of the connecting rod 4-4 below the pins is connected to the two support rods 4-5 by return springs. When the geared motor is started, it drives the ratchet 4-2 to move the connecting rod 4-4, causing the tapping component 4-3 at the end of the connecting rod 4-4 to tap the outer wall of the cold mold 1. The return spring is stretched and deformed, then returns to its original position. During this process, the connecting rod 4-4 returns to its original position under the stress of the return spring, waiting for the next tapping of the ratchet 4-2. This operation is repeated, ensuring continuous and uniform tapping of the outer wall of the cold mold 1. The control mechanism can be a generator, pneumatic device, or hydraulic device that works in conjunction with the transmission mechanism, or other mechanisms that can provide power to the displacement device. The transmission mechanism can be a gear and rack structure, a worm gear structure, a lead screw structure, or other structures with transmission functions.

[0038] The guiding device includes a guide rod 12 mounted on the rotary table 2, a guide tube 13 mounted on the guide rod 12 and moving along the length of the guide rod 12, and a support 14 mounted on the guide tube 13. The guide rod 12 is arranged parallel to the central axis of the cold mold 1. The two support rods 4-5 and the geared motor 4-1 are all mounted on the support 14.

[0039] A method for removing protective slag from the inner cavity of a metal mold, comprising the following steps, using the aforementioned removal device to remove protective slag adhering to the inner cavity of a cold mold 1:

[0040] Step S1: Hoist the cold mold 1 with the protective slag adhering to it onto the rotating wheel 3 of the rotary table and cool it to room temperature to determine the location in the inner cavity of the cold mold 1 where the slag needs to be removed;

[0041] Step S2: Start the displacement device to move the water welding gun 10 forward and insert it into the cold mold inner cavity;

[0042] Step S3: Adjust the telescopic shaft 6 so that the water welding gun 10 at the front end of the telescopic shaft 6 reaches the axial position of the area to be deslag removed;

[0043] Step S4: Start the rotating wheel 3 to drive the cold type 1 to rotate around the central axis, thereby adjusting the area to be descaled to the position where the water welding gun 10 can swing and heat to cover it, and wait for descaling;

[0044] Step S5: Start the geared motor 5 and the welding torch 10, and adjust the speed controller to control the reciprocating oscillation speed of the welding torch. Monitor the temperature of the area to be descaled using the temperature probe 11. Based on the data fed back by the temperature probe 11, adjust the welding torch 10 to a suitable temperature and drive the welding torch 10 to reciprocate and oscillate the area to be descaled to heat it until the protective slag falls off. The operation method of the welding torch 10 includes the following steps:

[0045] S501: Start the acetylene gas in the water welding gun 10, adjust the flame to a carbonization flame to preheat the area to be deslag removed, and turn on the oxygen to increase the air volume.

[0046] S502: The reciprocating heating range of the water welding torch 10 should be controlled within 300*300mm, and the time should be 15-20 seconds. When the temperature reaches 700-1000℃, the protective slag will fall off.

[0047] Step S6: For other locations where protective slag adheres, perform localized and repeated heating according to steps S3-S5. If there are cases where protective slag has not completely detached, the rotating wheel 3 that drives the cold mold 1 to rotate, in conjunction with the movable automatic tapping device 4, is used to repeatedly tap the locations where protective slag has not completely detached until the protective slag is completely detached.

[0048] The main component of the protective slag in this application is SiO2. At the location where the protective slag adheres to the inner cavity of the cold mold, a water welding gun is used to heat the area, raising the temperature to the softening point of SiO2. After cooling, the protective slag inside the threaded lines of the inner wall of the cold mold will fall off by itself. If there is protective slag that is not easy to fall off, an automatic tapping device 4 can be used to tap the cold mold to remove the protective slag adhering to the inner cavity of the cold mold.

[0049] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A device for removing cold-type internal cavity protective slag, characterized in that: It includes a rotating table (2) that can move relative to support the cold mold (1) and a slag removal device with a temperature detection component that can extend into the inner cavity of the cold mold (1) and is controlled by a reciprocating swing mechanism. The rotating table (2) is provided with rotating wheels (3) located on both sides of the cold mold (1) and driving the cold mold (1) to rotate. The slag removal device is set on the displacement device through the reciprocating swing mechanism and is arranged in front and behind the cold mold (1) on the rotating table (2). The relative movement between the rotating table (2) and the slag removal device and the rotation of the rotating wheels (3) are controlled by the control mechanism. The rotating table (2) is also equipped with an automatic striking device (4) that moves along the length of the cold mold (1) and strikes the cold mold (1); the movement of the automatic striking device (4) along the length of the cold mold (1) is controlled by a control mechanism, and the slag removal device moves forward or backward relative to the cold mold (1) through a displacement device controlled by the control mechanism. The reciprocating rocking mechanism includes a speed reducer motor (5) with a speed regulator installed on the displacement device and a crank connecting rod controlled by the speed reducer motor (5). The slag removal device is connected to the crank connecting rod through a telescopically adjustable telescopic shaft (6). The displacement device includes a bracket (7) set at the bottom of the geared motor (5) and a symmetrically arranged slide rail (8). The bracket (7) is set on the slide rail (8) by a positioning slider (9). The positioning slider (9) is engaged on the slide rail (8) and can slide along the slide rail (8). The slag removal device is a water welding gun (10). A temperature probe (11) is provided on one side of the water welding gun (10). The angle between the temperature probe (11) and the water welding gun (10) is smaller than the swing angle of the water welding gun (10) controlled by the reciprocating swing mechanism. The automatic tapping device (4) is set on one side of the cold type (1) by a guide device controlled by the control mechanism. It includes a ratchet (4-2) controlled to rotate by a second geared motor (4-1) and a connecting rod (4-4) with a tapping component (4-3) at one end and meshing with the ratchet (4-2) at the other end. The connecting rod (4-4) is mounted on the two support rods (4-5) by a pin and rotates on the pin under the drive of the ratchet (4-2). The part of the connecting rod (4-4) below the pin is connected to the two support rods (4-5) by a return spring. The guiding device includes a guide rod (12) set on a rotary table (2), a guide tube (13) set on the guide rod (12) and moving along the length of the guide rod (12), and a support (14) set on the guide tube (13). The two support rods (4-5) and the second deceleration motor (4-1) are all set on the support (14).

2. A method for removing cold-type internal cavity protective slag, characterized in that: The process of removing protective slag adhering to the inner cavity of the cold type (1) using the removal device according to claim 1 includes the following steps: Step S1: Hoist the cold mold (1) with the protective slag adhering to it onto the rotating wheel (3) of the rotating table and cool it to room temperature, and determine the location in the inner cavity of the cold mold (1) where the slag needs to be removed; Step S2: Start the displacement device to move the water welding gun (10) forward and into the cold mold inner cavity; Step S3: Adjust the telescopic shaft (6) so that the water welding gun (10) at the front end of the telescopic shaft (6) reaches the axial position of the area to be deslag removed; Step S4: Start the rotating wheel (3) to drive the cold type (1) to rotate, thereby adjusting the area to be descaled to the position where the water welding gun (10) can swing and heat to cover it while waiting for descaling; Step S5: Start the geared motor (5) and the water welding gun (10) and adjust the speed controller to control the reciprocating swing speed of the water welding gun. Monitor the temperature of the slag removal area through the temperature probe (11). Adjust the water welding gun (10) to a suitable temperature according to the data fed back by the temperature probe (11). Drive the water welding gun (10) to reciprocate and swing to heat the slag removal area until the protective slag falls off. Step S6: The other locations with adhered protective residue are repeatedly heated locally according to steps S3-S5. If there are still protective residues that have not completely fallen off, the rotating wheel (3) that drives the cold type (1) to rotate is used in conjunction with the movable automatic tapping device (4) to repeatedly tap the locations where the protective residues have not completely fallen off until the protective residues are completely removed. In step S5, the operation method of the water welding gun (10) includes the following steps: S501: Start the acetylene gas of the water welding gun (10), adjust the flame to a carbonization flame to preheat the area to be descaled, and turn on the oxygen to increase the air volume; S502: The reciprocating heating range of the water welding torch (10) is controlled within... Within 15-20 seconds, when the temperature reaches 700-1000℃, the protective slag will fall off. If the thicker protective slag does not fall off, use the automatic tapping device (4) in step 6 to tap it until it falls off completely.

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