CN117467817A - Automatic sand filling device and electric arc furnace - Google Patents

Abstract

The invention relates to an automatic sand filling device, which comprises a sand filling hopper, a guide sliding rail and a sliding plate, wherein the guide sliding rail is used for being installed on a water-cooled disc pipe area of a furnace shell of an eccentric area, and the sliding plate is in sliding fit with the guide sliding rail; the sliding plate is provided with a sliding driving mechanism, so that the sand filling hopper is provided with a sand filling position of the blanking port opposite to the sand filling port on the eccentric zone furnace shell and a standby position of the blanking port far away from the sand filling port; the sand filling hopper is provided with a blanking control valve, and a linkage mechanism for enabling the opening and closing actions of the blanking control valve to be matched with the station switching actions of the sand filling hopper is arranged. And also relates to an arc furnace provided with the automatic sand filling device. According to the invention, the automatic sand filling device is arranged in the water-cooled disc area of the eccentric area furnace shell, so that the automatic sand filling device has a simple structure and high response speed, and can improve the sand filling operation efficiency. The opening and closing actions of the blanking control valve are matched with the station switching actions of the sand filling hopper through the linkage mechanism, and the automatic operation controllability and the reliability are high.

Description

Automatic sand filling device and electric arc furnace

Technical Field

The invention belongs to the technical field of electric arc furnace production, and particularly relates to an automatic sand filling device and an electric arc furnace provided with the same.

Background

Most of the existing electric arc furnaces adopt a eccentric bottom tapping mode, and a sand filling mechanism is required to block a tapping hole before steel is discharged and steelmaking is performed again. At present, quite a lot of steel plants still adopt manual sand filling operation, so that the labor intensity is high, and safety accidents are easy to occur; although some steelworks design automatic sand filling mechanisms, such as the electric arc furnace sand filling device disclosed in chinese patent application CN201910961313.6, these sand filling mechanisms have a huge structure and slow action, which greatly affects the steelmaking production efficiency.

In addition, the existing sand filling mode is to observe the steel tapping hole manually to check filling conditions and judge whether sand filling needs to be continued or not, and operation is relatively backward and dangerous.

Disclosure of Invention

The invention relates to an automatic sand filling device and an electric arc furnace provided with the same, which at least can solve part of defects in the prior art.

The invention relates to an automatic sand filling device, which comprises a sand filling hopper, a guide sliding rail and a sliding plate, wherein the guide sliding rail is used for being installed on a water-cooled disc pipe area of a furnace shell of an eccentric area, and the sliding plate is in sliding fit with the guide sliding rail; the sliding plate is provided with a sliding driving mechanism, so that the sand filling hopper is provided with a sand filling position of a discharging opening opposite to the sand filling opening on the eccentric zone furnace shell and a standby position of the discharging opening far away from the sand filling opening; the sand filling hopper is provided with a blanking control valve, and a linkage mechanism for enabling the opening and closing actions of the blanking control valve to be matched with the station switching actions of the sand filling hopper is arranged.

As one of the implementation modes, the linkage mechanism comprises a rotary actuating rod for driving the blanking control valve to open and close, a follow-up assembly fixedly connected with the rotary actuating rod and an energizing structure capable of enabling the follow-up assembly to drive the rotary actuating rod to rotate, and the energizing structure is arranged on the guide sliding rail.

As one of the implementation modes, the follow-up assembly comprises a V-shaped bracket and two follow-up rollers, wherein the corner end of the V-shaped bracket is connected with the rotary actuating rod, the two follow-up rollers are respectively arranged at the two support leg ends of the V-shaped bracket, and the axis of the follow-up rollers is parallel to the axis of the rotary actuating rod.

As one of the implementation manners, the energizing structure comprises a baffle plate protruding on the guide sliding rail, and the setting position of the baffle plate satisfies:

when the sand filling hopper is positioned at the waiting position, the distance between the sand filling hopper and the sand filling position is larger than the distance between the baffle and the adjacent follow-up roller.

As one of the implementation modes, the guide sliding rail is also provided with a retaining plate for the follower roller to walk, and the upper surface of the retaining plate is parallel to the guide direction of the guide sliding rail; the retaining plate is located upstream of the energizing structure in a direction from the standby position to the sand complement position.

As one embodiment, the linkage mechanism further comprises a reset structure for resetting the follower assembly after rotation.

As one of the implementation modes, the front end of the sliding plate is provided with a sand filling port cover which is suitable for plugging the sand filling port.

As one embodiment, from the standby position to the sand filling position, the guiding direction of the guiding sliding rail is a slant upward direction.

As one of the implementation modes, the sliding plate is also provided with a visualization unit, the visualization unit is arranged adjacent to the sand filling hopper, and the visualization unit is positioned right above the sand filling port at the sand filling position.

The invention also relates to an electric arc furnace comprising a furnace shell, on which the automatic sand filling device as described above is arranged.

The invention has at least the following beneficial effects:

according to the invention, the automatic sand filling device is arranged in the water-cooled disc area of the eccentric area furnace shell, so that the automatic sand filling device has a simple structure and high response speed, and can improve the sand filling operation efficiency. The opening and closing actions of the blanking control valve are matched with the station switching actions of the sand filling hopper through the linkage mechanism, and the automatic operation controllability and the reliability are high.

The invention further has the following beneficial effects:

according to the invention, the V-shaped bracket with the follow-up roller is matched with the baffle, so that the rotary actuating rod can be driven to rotate to realize the opening and closing of the blanking control valve, the structure is simple, and the pure mechanical structure has very high working reliability.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic layout view of an automatic sand filling device according to an embodiment of the present invention;

FIG. 2 is a schematic view of a part of the structure of FIG. 1;

FIG. 3 is a front view of an automatic sand filling device according to a first embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an automatic sand filling device according to a first embodiment of the present invention;

FIG. 5 is a schematic diagram showing the sand filling hopper in a waiting position and a sand filling position;

FIG. 6 is a schematic diagram showing the arrangement of a tap hole opening and closing structure of an electric arc furnace according to a third embodiment of the present invention;

FIG. 7 is a sectional view of an opening and closing structure of a tap hole of an electric arc furnace according to a third embodiment of the present invention;

fig. 8 is a state diagram of the sand seal in the tapping position.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Referring to fig. 1 to 5, an embodiment of the present invention provides an automatic sand filling apparatus, comprising a sand filling hopper 201, a guide rail 210 for being mounted to a water-cooled coil section 101 of an eccentric section furnace shell 100, and a sliding plate 215 slidably engaged with the guide rail 210, wherein the sand filling hopper 201 is mounted on the sliding plate 215; the sliding plate 215 is provided with a sliding driving mechanism 211, so that the sand filling hopper 201 is provided with a sand filling position of a discharging opening opposite to the sand filling opening on the eccentric zone furnace shell 100 and a standby position of the discharging opening far away from the sand filling opening; the sand filling hopper 201 is provided with a blanking control valve 212, and a linkage mechanism for enabling the opening and closing actions of the blanking control valve 212 to be matched with the station switching actions of the sand filling hopper 201 is arranged.

The guide rail 210 is preferably directly installed on the water-cooling coil pipe of the eccentric zone furnace shell 100, specifically in the water-cooling coil pipe zone 101 at the top of the eccentric zone furnace shell 100; the sand filling port is also arranged in the water-cooling coil pipe area 101, and in the sand filling position, the blanking port of the sand filling hopper 201 is close to the sand filling port, so that the blanking reliability can be ensured, therefore, compared with the existing automatic sand filling equipment, in the embodiment, the blanking port of the sand filling hopper 201 can correspondingly realize large-caliber design, and the sand filling efficiency can be improved.

Because the eccentric area is narrow and small in position, the sand filling hopper 201 cannot be designed to be too large to store the sand for multiple times, therefore, the sand storage hopper 202 is preferably designed above the sand filling hopper 201, the sand storage hopper 202 can be designed to have a larger volume to accommodate the sand for multiple times, and the sand bag can be directly replenished and filled in through the crown block during sand storage, so that the complicated operation of replenishing the sand for multiple times is avoided, and the production efficiency can be effectively improved. The sand magazine 202 may be secured to the furnace lid lifting device or surrounding areas that do not interfere with the production operation, as the case may be.

In one embodiment, as shown in fig. 1, 2 and 4, the front end of the sliding plate 215 is provided with a sand filling cover 203 adapted to seal the sand filling opening, and the sand filling cover 203 can seal the sand filling opening during smelting; the front end of the sliding plate 215 specifically refers to an end of the sliding plate 215 near the sand filling opening when the sand filling hopper 201 is at the waiting position. When the sand filling hopper 201 is positioned at the waiting position, the sand filling port cover 203 covers the sand filling port; when the sand filling hopper 201 is positioned at the sand filling position, the sand filling port cover 203 is driven to deviate from the sand filling port, and specifically is positioned on one side of the sand filling port, which is far away from the waiting position.

Based on the structure, the opening and closing of the sand filling opening and the sand filling operation can be coupled, the response speed is high, the action coordination is high, the sand filling operation efficiency can be effectively improved, and the required driving equipment is reduced.

Preferably, as shown in fig. 3-5, the guide rail 210 is inclined, and has an included angle greater than 0 degrees with the horizontal plane, and specifically, the guide direction of the guide rail 210 is an upward direction from the standby position to the sand filling position. Based on this structure, when the sand filling hopper 201 runs from the standby position to the sand filling position, the sand filling port cover 203 can be instantly separated from the surface of the furnace shell 100 around the sand filling port, so that the sand filling port cover 203 can be effectively protected, and the service life of the sand filling port cover 203 can be prolonged; when the sand filling hopper 201 runs from the sand filling position to the standby position, the sand filling port cover 203 can be pressed on the sand filling port from the upper side, so that the blocking effect is ensured.

Preferably, the guiding sliding rail 210 comprises two rails respectively arranged at two sides of the sand filling opening, and the sliding plate 215 is respectively in sliding fit with the two rails; the sliding plate 215 is provided with a relief hole, the blanking opening of the sand filling hopper 201 can be in butt joint with the top end of the relief hole, or can be flush with the bottom end of the relief hole or positioned below the relief hole, so that the blanking requirement can be met.

The slide driving mechanism 211 includes, but is not limited to, a driving device such as an air cylinder or a hydraulic cylinder; preferably, the sliding driving mechanism 211 further includes a protection cover 204 for protecting the driving device from damage caused by high temperature, dust, and the like.

The blanking control valve 212 includes, but is not limited to, a flap valve, and the center of the circular flap is located on the axis of the sand filling hopper 201; preferably, when the circular turning plate is in a horizontal position (the plate surface is parallel to the horizontal plane), the sand filling hopper 201 is in a sand storage state, and when the circular turning plate rotates, discharging can be realized.

The linkage mechanism is used for enabling the opening and closing actions of the blanking control valve 212 to be matched with the station switching actions of the sand filling hopper 201, namely:

when the sand filling hopper 201 is at the standby position, the blanking control valve 212 is in a closed state;

when the sand filling hopper 201 is positioned at the sand filling position, the blanking control valve 212 is in an opened state;

preferably, when the sand filling hopper 201 is at the sand filling position, the blanking control valve 212 is opened to the maximum opening; for this case, preferably, during the process of running the sand filling hopper 201 from the standby position to the sand filling position, when the blanking port is just completely located right above the sand filling port, the blanking control valve 212 starts to open, and when the blanking port is coaxial with the sand filling port, the blanking control valve 212 opens to the maximum opening.

In one embodiment, as shown in fig. 1-3 and fig. 5, the linkage mechanism includes a rotary actuating rod 206 for driving the blanking control valve 212 to open and close, a follower assembly fixedly connected to the rotary actuating rod 206, and an energizing structure capable of enabling the follower assembly to drive the rotary actuating rod 206 to rotate, where the energizing structure is disposed on the guide sliding rail 210.

Taking a flap valve as an example of the blanking control valve 212, the rotary actuating rod 206 is connected with the circular flap, and can drive the circular flap to turn over.

The above-mentioned energizing structure mainly drives the follower assembly to rotate, and further drives the rotation actuating rod 206 to rotate. The energizing structure can adopt an active energizing mode or a passive energizing mode; wherein the interaction of the follower assembly with the energizing structure is preferably achieved by sliding movement of the sand hopper 201, which saves driving equipment, is highly reliable, and saves costs, e.g. the follower assembly is interfered by the energizing structure during operation of the sand hopper 201, resulting in interaction of the two.

In one embodiment, as shown in fig. 3 and 5, the follower assembly includes a V-shaped bracket 207 and two follower rollers 209, wherein the angular ends of the V-shaped bracket 207 are connected to the rotation actuating rod 206, the two follower rollers 209 are respectively disposed at two leg ends of the V-shaped bracket 207, and the axis of the follower rollers 209 is parallel to the axis of the rotation actuating rod 206.

The leg ends of the V-shaped bracket 207 are preferably positioned below the corner ends.

The angular ends of the V-shaped brackets 207 are preferably connected to the ends of the rotary actuator rod 206 to achieve a high torque.

Wherein the biasing structure preferably urges the follower assembly to rotate by interference with the follower roller 209. Preferably, as shown in fig. 1-5, the energizing structure includes a baffle 205 protruding on the guide rail 210, where the baffle 205 is located so as to interfere with the follower roller 209 on the front side; defining two follower rollers 209 as a first roller 2091 and a second roller 2092, the first roller 2091 being connected to a first strut and the second roller 2092 being connected to a second strut; when the sand hopper 201 is in the standby position, the second roller 2092 is located between the first roller 2091 and the baffle 205, and the baffle 205 is located so as to interfere with the second roller 2092. That is, the set position of the shutter 205 satisfies: when the sand filling hopper 201 is positioned at the waiting position, the distance between the sand filling hopper 201 and the sand filling position is larger than the distance between the baffle 205 and the adjacent follow-up roller 209; more specifically, the distance of travel of the sand filling hopper 201 from the standby position to the sand filling position is d1, and the distance between the second roller 2092 and the baffle 205 when the sand filling hopper 201 is at the standby position is d2, where d1 > d2.

In the process that the sand filling hopper 201 moves from the standby position to the sand filling position, the second roller 2092 is firstly contacted with the baffle 205, and along with the further forward movement of the sand filling hopper 201, the second roller 2092 rolls on the baffle 205, and meanwhile, the interaction force between the second roller 2092 and the baffle 205 makes the V-shaped bracket 207 rotate, so that the rotation actuating rod 206 is driven to rotate.

Further preferably, as shown in fig. 1-3 and fig. 5, the guide rail 210 is further provided with a retaining plate 208 for the follower roller 209 to walk, and an upper surface of the retaining plate 208 is parallel to a guiding direction of the guide rail 210; from the standby position to the sand filling position, the retaining plate 208 is located upstream of the energizing structure, for example, the retaining plate 208 is located on the side of the baffle 205 near the standby position.

Wherein, during the process of the sand filling hopper 201 moving from the standby position to the sand filling position, the follower rollers 209 roll on the holding plate 208, and the two follower rollers 209 form a bidirectional support, so that the rotation of the rotary execution rod 206 can be prevented; when the second roller 2092 interferes with the shutter 205, the first roller 2091 contacts the retaining plate 208, and the V-bracket 207 swings upward instead of downward, and the second roller 2092 then rolls upward on the shutter 205 and further swings the V-bracket 207 upward.

The height of the baffle 205 should meet the requirement of the maximum opening of the blanking control valve 212, that is, it should be avoided that the blanking control valve 212 cannot be opened to the maximum opening due to interference of the baffle 205 to rotation of the second support rod, which can be determined and adjusted according to factors such as the swing angle of the V-shaped bracket 207, the length of the second support rod, the included angle between the second support rod and the horizontal plane when the second roller 2092 contacts the baffle 205, and the movement stroke of the sand filling hopper 201 when the blanking control valve 212 is opened to the maximum opening; including but not limited to: when the sand hopper 201 is operated to the sand filling position, the second roller 2092 rolls just to the top of the baffle 205.

Preferably, as shown in fig. 3, a certain distance is provided between the retaining plate 208 and the baffle 205, so that the smoothness of rotation of the second roller 2092, the second strut and the V-shaped bracket 207 can be ensured.

Preferably, the guide rail 210 includes a rail seat and a rail disposed in the rail seat; the retaining plate 208, the baffle 205 may be mounted on the rail seat.

Further preferably, the linkage mechanism further comprises a reset structure for resetting the follower assembly after rotation. The reset structure includes, but is not limited to, the use of a weight that may be mounted at the corner of the V-bracket 207, on the first bracket, etc.

Based on the above scheme, the V-shaped bracket 207 with the follow-up roller 209 is matched with the baffle 205, so that the rotary actuating rod 206 can be driven to rotate to realize the opening and closing of the blanking control valve 212, the structure is simple, and the pure mechanical structure has very high working reliability.

In one embodiment, as shown in fig. 4, the sliding plate 215 is further provided with a visualization unit 213, and in the sand filling position, the visualization unit 213 is located directly above the sand filling hole, which can clearly observe the sand filling condition of the steel tapping hole in the electric arc furnace, and ensure the reliability, accuracy and safety of the sand filling operation. The above-mentioned visualization unit 213 includes, but is not limited to, employing an industrial camera or the like; the visualization unit 213 is communicated with the control center, and can automatically judge whether sand filling is needed to be continued or not directly through an image recognition mode, and can judge whether sand filling is completed or not through manually checking image information returned by the visualization unit 213.

Further, in order to ensure good visual effect and protect the visualization unit 213 from high temperature, a blowing pipe 214 may be provided beside to cool the apparatus and keep the visualization unit 213 clean by blowing cooling gas; the lance 214 may be normally open.

Example two

An embodiment of the present invention provides an electric arc furnace, including a furnace shell 100, where the furnace shell 100 is provided with an automatic sand filling device as provided in the first embodiment, and a specific installation structure of the automatic sand filling device is described in the first embodiment, which is not described herein.

Example III

The embodiment of the invention further optimizes the second embodiment, and the electric arc furnace is also provided with a tapping hole opening and closing structure.

As shown in fig. 6-8, the steel-tapping hole opening and closing structure comprises a sand sealing plate 7 and an opening and closing driving mechanism for driving the sand sealing plate 7 to move so as to open and close a steel-tapping hole 15, wherein the opening and closing driving mechanism comprises a traction chain 3 and a driving unit capable of winding and unwinding the traction chain 3, the traction chain 3 is respectively connected with the sand sealing plate 7 and the driving unit, and the driving unit is installed on a furnace shell 100; the sand seal 7 is provided with a reset structure for resetting the sand seal 7 from the tapping position to the plugging position.

The electric arc furnace preferably adopts an eccentric bottom tapping mode, a tapping hole 15 is arranged at the bottom of an eccentric zone of the furnace shell 100, and a sand sealing plate 7 is positioned below the tapping hole 15. During normal smelting, sand 16 fills tap hole 15, molten steel and refractory layer are stored in furnace shell 100 in contact, after the temperature and composition of the molten steel reach the tapping requirement, sand 16 in tap hole 15 needs to flow out, sand sealing plate 7 moves to the tapping position, sand 16 does not have a barrier, falls from tap hole 15 under the action of gravity and the pressure of the molten steel in the furnace, and then flows out from tap hole 15 to finish tapping operation.

In one of the embodiments, as shown in fig. 6, a fixing frame 5 is provided below the tap hole 15, and the fixing frame 5 is fixedly installed at the bottom of the furnace shell 100, preferably made of a high-temperature-resistant steel plate, including but not limited to a rectangular structure. A guide sliding rail 6 is arranged on the fixed frame 5, and a sand sealing plate 7 is arranged on the fixed frame 5 in a sliding way; the sliding part on the sand seal 7 can be in the form of a slide block, a roller, etc.

Wherein, a stroke limiting structure can be arranged on the fixed frame 5, and two translation stroke ends of the sand sealing plate 7 are limited to correspond to the plugging position and the tapping position of the sand sealing plate 7; including but not limited to, providing travel limiting blocks at both ends of the guide rail 6.

The sand sealing plate 7 is provided with a tapping notch and a plugging area, when the sand sealing plate 7 is positioned at a tapping position, the tapping notch is positioned right below the tapping hole 15, and the tapping notch can avoid steel flow; when the sand seal plate 7 is in the sealing position, the sealing area is positioned right below the tapping hole 15 and is used for sealing the tapping hole 15.

Wherein, the interval between the sand seal 7 and the lower end of the tapping hole 15 is preferably controlled to be 20-30 mm so as to ensure that the sand seal 7 does not collide with the tapping hole 15 in a heat radiation state.

Connecting holes may be provided at the corresponding ends of the sand seal 7 for connecting the drag chain 3, including but not limited to bolting.

In one of the embodiments, as shown in fig. 6, the drive unit comprises a winding disc 2 rotatably mounted on a furnace shell 100 and a drive assembly 1 for driving the winding disc 2 in rotation, the traction chain 3 being wound on the winding disc 2.

Wherein the driving assembly 1 comprises, but is not limited to, an electric motor, a hydraulic motor, a swinging hydraulic cylinder and the like; the drive assembly 1 and the winding disc 2 are preferably connected coaxially and in phase.

In one embodiment, as shown in fig. 6, the opening and closing driving mechanism further comprises a guiding structure, the guiding structure is mounted on the furnace shell 100, and one end of the traction chain 3 is connected with the driving unit and guided to be connected with the sand sealing plate 7 through the guiding structure. The guide structure can reliably guide the traction chain 3 and simultaneously help to improve the tensioning degree of the traction chain 3. Preferably, the guiding structure comprises at least one guiding wheel 4, each guiding wheel 4 is rotatably mounted on the furnace shell 100, and the traction chain 3 sequentially winds around each guiding wheel 4 and then is connected with the sand sealing plate 7; wherein for the case comprising a winding disc 2 and a guiding wheel 4, the axis of the guiding wheel 4 is generally parallel to the axis of the winding disc 2.

In one embodiment, as shown in fig. 7 and 8, the reset structure includes a reset spring 9, the axis of the reset spring 9 is parallel to the translation direction of the sand sealing plate 7, a spring guide rod 11 is arranged on the sand sealing plate 7, the reset spring 9 is sleeved on the spring guide rod 11, and two ends of the reset spring 9 are respectively abutted with a first spring limiting part connected to the furnace shell 100 and a second spring limiting part arranged on the spring guide rod 11.

The return spring 9 can be arranged on the side of the sand seal 7 remote from the drag chain 3, for example, the drag chain 3 and the spring guide 11 being connected to the two ends of the sand seal 7.

The reset spring 9 can be arranged on the outer side of the fixed frame 5, and the spring guide rod 11 extends out of the fixed frame 5 and is sleeved with the reset spring 9; the corresponding side plate body of the fixing frame 5 is correspondingly configured as the first spring limiting part. Bearings 17 are preferably provided at the penetrating holes of the fixing frame 5 to support the spring guide bars 11.

Further preferably, as shown in fig. 6-8, the return structure further comprises a protective cover 8, the protective cover 8 being connected to the furnace shell 100 and enclosing the return spring 9. In the case of a spring guide rod 11 extending from the holder 5, the protective cover 8 can be correspondingly mounted on the holder 5; preferably, a detachable connection mode is adopted, so that the installation and maintenance of the reset spring 9 and the like can be facilitated. Through setting up safety cover 8, can protect reset spring 9 better, avoid reset spring 9 etc. to be influenced by the thermal radiation, prolong the life of equipment effectively.

Wherein, a plurality of reset springs 9 can be provided, so that the working reliability of the tapping hole opening and closing structure can be ensured; the protective cover 8 may be provided in plural numbers, and is disposed in one-to-one correspondence with the return spring 9.

Preferably, when the sand sealing plate 7 is in the plugging position, the return spring 9 is in a precompressed state, so that pretightening force can be provided for the sand sealing plate 7, the sand sealing plate 7 is stably in the plugging position, and the stability and safety of the production of the electric arc furnace are ensured; when the sand sealing plate 7 moves to the tapping position side, the reset spring 9 is further compressed, the elastic resistance can play a role in damping and buffering, the translation stability and smoothness of the sand sealing plate 7 are ensured, and the accuracy of detecting the torque borne by the driving unit can be improved. After the active force of the drive unit on the traction chain 3 is released, the elastic force of the return spring 9 can move the sand sealing plate 7 from the tapping position to the plugging position.

Further preferably, as shown in fig. 7 and 8, the second spring limiting portion is an adjusting nut 10 screwed on the spring guiding rod 11, and the precompression degree of the return spring 9 can be adjusted through the adjusting nut 10, so that the state of the return spring 9 can be matched with the state of the traction chain 3, and the restoring acting force of the sand sealing plate 7 can be adjusted, so that the working reliability of the tapping hole opening and closing structure is improved.

In one embodiment, the on-off driving mechanism further comprises a control module and a detection unit for detecting the torque applied to the driving unit, wherein the detection unit and the driving unit are electrically connected with the control module; the control module is used for acquiring a detection signal fed back by the detection unit and controlling the driving unit to switch between a locking state and a free state. Based on the scheme, the position of the sand sealing plate 7 is judged by detecting the torque born by the driving unit, the influence of the length of the traction chain 3 can be avoided, and even if the length of the traction chain 3 is increased due to heat radiation and the like, the positioning position of the sand sealing plate 7 can not be influenced, so that the working reliability of the tapping hole opening and closing structure can be remarkably improved.

When the sand seal 7 moves to the tapping position, the torque applied to the driving unit increases suddenly, and the locking state is triggered at the moment; this abrupt increase in torque may be due to a limit on the travel of the sand seal 7. In addition, the driving unit is switched from the locked state to the free state, including but not limited to being triggered after receiving the tapping completion signal by a central console of the electric arc furnace production plant.

Wherein for a construction in which the drive unit comprises a winding disc 2 and a drive assembly 1, the above-mentioned detection unit can be used for detecting the torque to which the drive assembly 1 is subjected. The control module can be a central console of an electric arc furnace production workshop or a separate central controller.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. An automatic sand filling device which is characterized in that: the sand filling device comprises a sand filling hopper, a guide sliding rail and a sliding plate, wherein the guide sliding rail is used for being installed on a water-cooled disc area of a furnace shell of an eccentric area, and the sliding plate is in sliding fit with the guide sliding rail; the sliding plate is provided with a sliding driving mechanism, so that the sand filling hopper is provided with a sand filling position of a discharging opening opposite to the sand filling opening on the eccentric zone furnace shell and a standby position of the discharging opening far away from the sand filling opening; the sand filling hopper is provided with a blanking control valve, and a linkage mechanism for enabling the opening and closing actions of the blanking control valve to be matched with the station switching actions of the sand filling hopper is arranged.

2. The automatic sand filling device according to claim 1, wherein: the linkage mechanism comprises a rotary actuating rod for driving the blanking control valve to open and close, a follow-up assembly fixedly connected with the rotary actuating rod and an energizing structure capable of enabling the follow-up assembly to drive the rotary actuating rod to rotate, and the energizing structure is arranged on the guide sliding rail.

3. The automatic sand filling device according to claim 2, wherein: the follow-up assembly comprises a V-shaped support and two follow-up rollers, wherein the corner end of the V-shaped support is connected with the rotary actuating rod, the two follow-up rollers are respectively arranged at the two support leg ends of the V-shaped support, and the axis of the follow-up rollers is parallel to the axis of the rotary actuating rod.

4. The automatic sand filling device according to claim 3, wherein the energizing structure comprises a baffle plate protruding on the guide slide rail, and the setting position of the baffle plate satisfies:

when the sand filling hopper is positioned at the waiting position, the distance between the sand filling hopper and the sand filling position is larger than the distance between the baffle and the adjacent follow-up roller.

5. The automatic sand filling apparatus of claim 3, wherein: the guide sliding rail is also provided with a retaining plate for the follower roller to walk, and the upper surface of the retaining plate is parallel to the guide direction of the guide sliding rail; the retaining plate is located upstream of the energizing structure in a direction from the standby position to the sand complement position.

6. The automatic sand filling device according to claim 2, wherein: the linkage mechanism further comprises a reset structure for resetting the follower assembly after rotation.

7. The automatic sand filling device according to claim 1, wherein: the front end of the sliding plate is provided with a sand filling port cover which is suitable for plugging the sand filling port.

8. The automated sand filling apparatus of claim 7, wherein: and the guiding direction of the guiding sliding rail is an inclined upward direction from the standby position to the sand supplementing position.

9. The automatic sand filling device according to claim 1, wherein: the sliding plate is also provided with a visual unit, the visual unit is arranged adjacent to the sand filling hopper, and is positioned right above the sand filling port in the sand filling position.

10. An arc furnace comprising a furnace shell, characterized in that: an automatic sand filling device according to any one of claims 1 to 9 is arranged on the furnace shell.