Crystallizer casting powder sample preparation device and sample preparation method

Abstract

The crystallizer casting powder sample preparation device comprises a sample template and a hollow mold, the hollow mold is arranged above the sample template, a plurality of sample preparation holes are formed in the upper end of the sample template, a lifting plate is fixed to the upper end of the hollow mold, and two guide rails are symmetrically fixed to the left side and the right side of the lower end of the sample template; and an L-shaped rack is fixed to the rear side of the right end of the base plate. A traditional mode of applying pressure to casting powder through a punch is changed into a mode of filling nitrogen into the sample preparation hole, so that pressure is applied to the casting powder through the pressure of the nitrogen, the casting powder is prepared, subsequent mold cleaning is not needed, the workload of workers is reduced, and due to the fact that alcohol needs to be used for blending in the sample preparation process, the alcohol is prone to volatilization, and the production cost is reduced. Meanwhile, the nitrogen can prevent alcohol in the sample from volatilizing, so that the sample can be prevented from being dried, and after the sample is prepared, sampling can be carried out without upwards moving the hollow mold, so that the operation is simpler and more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of mold protection slag sample preparation, and in particular to a crystallizer protection slag sample preparation device and a sample preparation method. Background Art

[0002] The protective slag is added to the crystallizer during continuous casting production. It has the functions of covering and heat preservation, preventing secondary oxidation, absorbing slag inclusions, lubricating between the crystallizer and the ingot, and improving the heat transfer performance between the crystallizer and the ingot. The crystallizer protective slag is the main means to control the thickness of the slag layer, the uniformity of the slag film and the slag consumption. It is also an important metallurgical material to ensure the smooth production of the continuous casting machine and the quality of the continuous casting ingot. However, if the melting performance of the protective slag added to the crystallizer is poor, it will deteriorate its heat transfer performance between the crystallizer wall and the billet, affecting the surface quality of the ingot. In severe cases, it will cause bonding and steel leakage accidents. Therefore, the melting performance test of the crystallizer protective slag is very important to ensure the quality of the billet. Therefore, the crystallizer protective slag sample needs to be made into a standard test sample of φ3mm×3mm.

[0003] At present, in the preparation of samples of crystallizer protective slag, most of the methods use a punch to apply pressure to the protective slag. For example, the utility model with patent document number CN218330880U discloses a crystallizer protective slag sampling device, which uses a punch to apply pressure to the protective slag. After the crystallizer protective slag is sampled, some residues will stick to the surface of the punch, so that the punch needs to be cleaned frequently, which increases the workload of the staff. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a crystallizer protection slag sample preparation device and sample preparation method to solve the problems raised in the above background technology.

[0005] A crystallizer protective slag sample preparation device comprises a sample template and a hollow mold, the hollow mold is arranged above the sample template, a plurality of sample preparation holes are opened at the upper end of the sample template, a lifting plate is fixed at the upper end of the hollow mold, two guide rails are symmetrically fixed on the left and right sides of the lower end of the sample template, a pad is slidably connected between the guide rails, an L-shaped rack is fixed to the rear side of the right end of the pad, a driving device is fixedly installed on the rear side of the right end of the sample template, the L-shaped rack is located below the driving device and is meshed with the driving device, the driving device drives the pad to translate forward and backward by meshing with the L-shaped rack, the lifting plate is connected to the driving device, the driving device drives the hollow mold to lift and lower, a plurality of nozzles connected thereto are fixed at the lower end of the hollow mold, the nozzles are plugged into the sample preparation holes one by one above and below, a connecting pipe is passed through and fixed at the upper end of the lifting plate, the connecting pipe is fixed and communicated with the hollow mold, a nitrogen delivery pipe is connected to the end of the connecting pipe, and a nitrogen delivery pump is connected to the end of the nitrogen delivery pipe.

[0006] Furthermore, a sealing gasket is fixedly connected to the upper end of the pad, and the upper surface of the sealing gasket is seamlessly fitted with the lower surface of the sample template.

[0007] Furthermore, the driving device includes a hollow column, a button panel, an electric push rod, a motor, a rotating shaft, an externally threaded sleeve, a nut, a shaft and a gear. The hollow column is fixed to the sample template, and a cylindrical inner cavity is provided inside the hollow column. The button panel is fixedly installed at the right end of the hollow column, and the electric push rod is fixedly installed at the top of the cylindrical inner cavity. A mounting seat is fixed at the lower driving end of the electric push rod, and the motor is fixedly installed at the lower end of the mounting seat. The button panel is electrically connected to the electric push rod and the motor.

[0008] Furthermore, the rotating shaft is connected to the driving end of the motor, the externally threaded sleeve bearing is connected to the inside of the cylindrical inner cavity, the externally threaded sleeve is sleeved on the outside of the rotating shaft, a sleeve connecting cover is fixed to the inner wall of the externally threaded sleeve, a stop plate is fixed to one side of the inner wall of the sleeve connecting cover, a spring groove is opened on both sides of the outer wall of the rotating shaft, a shift block is slidably connected to the inside of the spring groove, a spring is fixedly connected between a lower end of the shift block and the bottom end of the spring groove, and the shift block is abutted against a stop plate.

[0009] Furthermore, the nut is threadedly connected to the outside of the external threaded sleeve, the left end of the nut is fixedly connected to a guide block, the left end of the hollow column is provided with a guide groove, the left part of the guide block extends out of the guide groove and is welded and fixed to the lifting plate.

[0010] Furthermore, a rotating block is fixedly connected to the lower part of the rotating shaft, two spring grooves are opened on both sides of the outer wall of the rotating block, two shift blocks are slidably connected inside the two spring grooves, two springs are fixedly connected between the upper end of the two shift blocks and the top end of the two spring grooves, a gear connecting cover is rotatably connected to the bottom of the cylindrical inner cavity, two stop plates are fixed to one side of the inner wall of the gear connecting cover, and the two shift blocks are abutted against the two stop plates.

[0011] Furthermore, the shaft bearing is connected to the lower end of the hollow column, the gear is fixed to the lower end of the shaft, the upper end of the shaft is fixedly connected to the lower end of the gear connection cover, and the L-shaped rack is located on one side of the gear and meshingly connected to the gear.

[0012] A method for preparing a sample of mold powder, based on the above-mentioned device for preparing a sample of mold powder, specifically comprises the following steps:

[0013] S1. Control the driving device through the button panel to drive the pad to move forward into the lower part of the sample template and fill the protective slag into the sample preparation hole;

[0014] S2, control the driving device through the button panel to drive the hollow mold to move downward so that the nozzle is inserted into the sample preparation hole;

[0015] S3, start the nitrogen delivery pump, input nitrogen into the hollow mold, and spray nitrogen from the nozzle into the sample preparation hole to apply air pressure to the protective slag. After 2s-5s, turn off the nitrogen delivery pump to complete the shaping of the protective slag sample;

[0016] S4. After the protective slag sample is finalized, the driving device is controlled by the button panel to drive the pad and move it out from the bottom of the sample template, and the nitrogen delivery pump is started again to use nitrogen to push the protective slag sample downward to complete the sample preparation.

[0017] Beneficial effects of the present invention:

[0018] 1. The traditional punch that applies pressure to the protective slag is improved to fill the sample preparation hole with nitrogen, so that the nitrogen pressure applies pressure to the protective slag to complete the sample preparation of the protective slag. There is no need to clean the mold later, which reduces the workload of the staff. In addition, since alcohol is required to be blended when making the sample, and alcohol is volatile, nitrogen can prevent the alcohol in the sample from volatilizing, thereby avoiding the sample from drying out. After the sample is prepared, there is no need to move the hollow mold up again to take the sample, which makes the operation simpler and more convenient.

[0019] 2. When the hollow mold needs to be driven to rise and fall, the electric push rod only needs to be retracted to move the motor upward, so that the upward movement of the rotating shaft can drive the rotating block to move upward, so that the first shift block moves into the sleeve connection cover and the second shift block moves out of the gear connection cover. At this time, the first shift block can be pressed against the first stopper to drive the external threaded sleeve to rotate. When the pad needs to be translated back and forth, the electric push rod only needs to be extended to move the motor downward, so that the downward movement of the rotating shaft can drive the rotating block to move downward and insert into the gear connection cover, so that the first shift block moves out of the sleeve connection cover and the second shift block moves into the gear connection cover. At this time, the second shift block can be pressed against the second stopper to drive the gear to rotate. In this way, one driving device can be used to drive the lifting and lowering of the hollow mold and the translation of the pad back and forth, respectively, and can be integrated together for convenient operation.

[0020] 3. When one of the shift blocks 1 and the stop plate 1 are exactly on the same vertical line, as the other shift block 1 moves into the sleeve connection cover, the shift block 1 and the stop plate 1 are exactly vertically abutted and temporarily do not move into the sleeve connection cover. At this time, the shift block 1 moves relatively to squeeze the spring 1, so as not to hinder the other shift block 1 from moving into the sleeve connection cover. When one of the shift blocks 2 and the stop plate 2 are exactly on the same vertical line, as the other shift block 2 moves into the gear connection cover, the shift block 2 and the stop plate 2 are exactly vertically abutted and temporarily do not move into the gear connection cover. At this time, the shift block 2 moves relatively to squeeze the spring 2, so as not to hinder the other shift block 2 from moving into the gear connection cover, thereby ensuring that there is no need for manual rotation to adjust the misalignment of the shift block 1 and the stop plate 1 or the shift block 2 and the stop plate 2, which is convenient for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the bottom of the hollow mold of the present invention;

[0023] Figure 3 It is a cross-sectional schematic diagram of the driving device of the present invention;

[0024] Figure 4 It is a bottom view schematic diagram of the sleeve connection cover of the present invention;

[0025] Figure 5 It is a top view schematic diagram of the gear connection cover of the present invention;

[0026] Figure 6 It is a partial schematic diagram of the rotating shaft of the present invention.

[0027] In the figure: 1-sample template, 2-guide rail, 3-sample preparation hole, 4-lifting plate, 5-hollow mold, 6-connecting pipe, 7-nitrogen delivery pipe, 8-pad, 9-sealing pad, 10-L-shaped rack, 11-hollow column, 12-button panel, 13-nozzle, 14-electric push rod, 15-motor, 16-rotating shaft, 17-external threaded sleeve, 18-nut, 19-guide groove, 20-guide block, 21-sleeve connecting cover, 22-stopper piece 1, 23-shift block 1, 24-rotating block, 25-shift block 2, 26-gear connecting cover, 27-stopper piece 2, 28-shaft rod, 29-gear, 30-spring groove 1, 31-spring groove 2. DETAILED DESCRIPTION

[0028] See also Figure 1-Figure 2A crystallizer protection slag sample preparation device comprises a sample template 1 and a hollow mold 5, wherein the hollow mold 5 is arranged above the sample template 1, and a plurality of sample preparation holes 3 are opened at the upper end of the sample template 1, and a lifting plate 4 is fixed to the upper end of the hollow mold 5, and two guide rails 2 are symmetrically fixed to the left and right sides of the lower end of the sample template 1, and a pad 8 is slidably connected between the guide rails 2, and an L-shaped rack 10 is fixed to the rear side of the right end of the pad 8, and a driving device is fixedly installed at the rear side of the right end of the sample template 1, and the L-shaped rack 10 is located below the driving device and meshed with the driving device, and the driving device is connected to the L-shaped rack by the driving device. The rack 10 is engaged to drive the pad 8 to translate forward and backward, the lifting plate 4 is connected to the driving device, and the driving device drives the hollow mold 5 to move up and down. A plurality of nozzles 13 connected thereto are fixed at the lower end of the hollow mold 5, and the nozzles 13 are plugged in one by one with the sample preparation holes 3. A connecting pipe 6 is fixed through the upper end of the lifting plate 4, and the connecting pipe 6 is fixed and communicated with the hollow mold 5. A nitrogen delivery pipe 7 is connected to the end of the connecting pipe 6, and a nitrogen delivery pump is connected to the end of the nitrogen delivery pipe 7. The nitrogen delivery pump is externally connected to a power supply and a switch, and the driving device drives the pad 8 to move forward into the sample. The lower part of the template 1 is made so that the pad 8 covers the bottom of the sample preparation hole 3, and then the protective slag is filled into the sample preparation hole 3. The protective slag falls on the pad 8, and then the lifting plate 4 is driven downward by the driving device. The lifting plate 4 drives the hollow mold 5 to move downward and plug into the sample template 1, so that the nozzle 13 is inserted into the sample preparation hole 3 one by one. The outside of the nozzle 13 is coated with rubber to improve the sealing performance, and then the nitrogen delivery pump is started to input nitrogen into the hollow mold 5 along the nitrogen delivery pipe 7 and the connecting pipe 6. The nitrogen delivery pipe 7 is a metal hose, so that the nozzle 13 sprays nitrogen into the sample preparation hole 3 to apply air pressure to the protective slag. After 2s-5s, Turn off the nitrogen delivery pump to complete the shaping of the protective slag sample, then drive the pad 8 through the driving device to move it out of the lower part of the sample template 1. At this time, there is no obstruction under the sample preparation hole 3. Start the nitrogen delivery pump again, and use nitrogen to push the protective slag sample downward to complete the sample preparation. In this way, there is no need to clean the mold later, which reduces the workload of the staff. In addition, since alcohol needs to be used to blend when making the sample, alcohol is volatile, and nitrogen can prevent the alcohol in the sample from evaporating, it can also avoid causing the sample to dry out. After the sample is prepared, there is no need to move the hollow mold 5 up again to take the sample, and the operation is simpler and more convenient.

[0029] See also Figure 1 A sealing gasket 9 is fixedly connected to the upper end of the pad 8, and the upper surface of the sealing gasket 9 is seamlessly fitted with the lower surface of the sample template 1. By arranging the sealing gasket 9 on the upper surface of the pad 8, and the sealing gasket 9 is made of a hard sealing material, the sealing between the pad 8 and the sample template 1 can be improved.

[0030] See also Figure 1-Figure 3The driving device includes a hollow column 11, a button panel 12, an electric push rod 14, a motor 15, a rotating shaft 16, an externally threaded sleeve 17, a nut 18, a shaft 28 and a gear 29. The hollow column 11 is fixed to the sample template 1. A cylindrical inner cavity is provided inside the hollow column 11. The button panel 12 is fixedly mounted on the right end of the hollow column 11. The electric push rod 14 is fixedly mounted on the top of the cylindrical inner cavity. A mounting seat is fixedly provided at the lower driving end of the electric push rod 14. The motor 15 is fixedly mounted at the lower end of the mounting seat. The button panel 12 is electrically connected to the electric push rod 14 and the motor 15. A plurality of buttons for respectively controlling the electric push rod 14 and the motor 15 are arranged on the surface of the button panel 12. The electric push rod 14 and the motor 15 are both externally connected to a power supply. The buttons on the button panel 12 can control the extension and retraction of the electric push rod 14 or the forward and reverse rotation of the motor 15.

[0031] See also Figure 1-Figure 6 The rotating shaft 16 is connected to the driving end of the motor 15, the external threaded sleeve 17 bearing is connected inside the cylindrical inner cavity, the external threaded sleeve 17 is sleeved outside the rotating shaft 16, the inner wall of the external threaded sleeve 17 is fixed with a sleeve connecting cover 21, and a stopper piece 22 is fixed on one side of the inner wall of the sleeve connecting cover 21. Spring grooves 30 are opened on both sides of the outer wall of the rotating shaft 16, and a shifting block 23 is slidably connected inside the spring groove 30. A spring 1 is fixedly connected between the lower end of the shifting block 23 and the bottom end of the spring groove 30, and the shifting block 23 is against the stopper piece 22. When the electric push rod 14 contracts, it drives the motor 15 to move upward, and the motor 15 drives the rotating shaft 16 When the rotating shaft 16 moves upward, the rotating shaft 16 drives the shift block 23 to move upward into the sleeve connecting cover 21. If one of the shift blocks 23 is vertically against the stopper 22, the shift block 23 will make relative movement inside the spring groove 30 to squeeze the spring 1, while the other shift block 23 will normally enter the sleeve connecting cover 21. At this time, when the rotating shaft 16 rotates, it can drive the shift block 23 to rotate first, so that the shift block 23 that is against the stopper 22 can also rotate to be misaligned with the stopper 22, and then return to enter the sleeve connecting cover 21 through the spring 1. Subsequently, after the shift block 23 rotates until it is horizontally against the stopper 22, it can push the sleeve connecting cover 21 to rotate, and then the sleeve connecting cover 21 drives the external threaded sleeve 17 to rotate.

[0032] See also Figure 1-Figure 3 The nut 18 is threadedly connected to the outside of the external threaded sleeve 17, and a guide block 20 is fixedly connected to the left end of the nut 18. A guide groove 19 is opened at the left end of the hollow column 11. The left part of the guide block 20 extends out of the guide groove 19 and is welded and fixed to the lifting plate 4. When the external threaded sleeve 17 rotates, it can be threadedly matched with the nut 18, and then the nut 18 can drive the guide block 20 to move up and down along the guide groove 19, so that the guide block 20 can drive the lifting plate 4 to move up and down, and the lifting plate 4 drives the hollow mold 5 to move up and down.

[0033] See also Figure 1-Figure 6 The lower part of the rotating shaft 16 is fixedly connected with a rotating block 24, and two spring grooves 31 are opened on both sides of the outer wall of the rotating block 24. A second shifting block 25 is slidably connected inside the second spring groove 31, and a second spring is fixedly connected between the upper end of the second shifting block 25 and the top of the inner part of the second spring groove 31. The bottom of the cylindrical inner cavity is rotatably connected with a gear connecting cover 26, and a second stopper sheet 27 is fixed on one side of the inner wall of the gear connecting cover 26. The second shifting block 25 abuts against the second stopper sheet 27. When the electric push rod 14 is extended, it drives the motor 15 to move downward, the motor 15 drives the rotating shaft 16 to move downward, and the rotating shaft 16 drives the second shifting block 25 to move downward into the gear connecting cover 26, and at the same time When the shift block 1 23 moves downward out of the sleeve connecting cover 21, this will not drive the sleeve connecting cover 21 to rotate. If one of the shift blocks 25 is vertically against the stop plate 27, the shift block 25 will make relative movement inside the spring groove 21 to squeeze the spring 2, while the other shift block 25 will normally enter the gear connecting cover 26. At this time, when the rotating shaft 16 rotates, it can drive the shift block 25 to rotate first, so that the shift block 25 that is abutted can also rotate and be misaligned with the stop plate 27, and then return to the gear connecting cover 26 through the spring 2, and then the shift block 25 rotates until it is horizontally against the stop plate 27, which can push the gear connecting cover 26 to rotate.

[0034] See also Figure 1-Figure 3 The shaft 28 is connected to the lower end of the hollow column 11 by a bearing, and the gear 29 is fixed to the lower end of the shaft 28. The upper end of the shaft 28 is fixedly connected to the lower end of the gear connection cover 26. The L-shaped rack 10 is located on one side of the gear 29 and is meshed with the gear 29. When the gear connection cover 26 rotates, the shaft 28 can be driven to rotate, and the shaft 28 will drive the gear 29 to rotate. The gear 29 is meshed with the L-shaped rack 10, and the L-shaped rack 10 is moved back and forth, so that the L-shaped rack 10 can drive the pad 8 to translate back and forth along the guide rail 2. In this way, a driving device can be used to drive the lifting and lowering of the hollow mold 5 and the translation of the pad 8 back and forth respectively. They can be integrated together for easy operation, and it is ensured that there is no need for manual rotation to adjust the misalignment of the shift block 1 23 and the stop plate 1 22 or the shift block 25 and the stop plate 2 27, which is convenient for users.

[0035] Working principle: The electric push rod 14 is extended by the button on the button panel 12, driving the motor 15 to move downward, the motor 15 drives the shaft 16 to move downward, the shaft 16 drives the shift block 25 to move downward into the gear connection cover 26, and the shift block 1 23 moves downward out of the sleeve connection cover 21, and then the button on the button panel 12 is used to control the motor 15 to rotate forward. At this time, the shaft 16 rotates clockwise, which can drive the shift block 25 to first perform a clockwise circular motion. After the movement is horizontally against the stopper piece 27, the gear connection cover 26 can be pushed to rotate clockwise, and then through The shaft 28 drives the gear 29 to rotate clockwise, and the gear 29 meshes with the L-shaped rack 10, so that the L-shaped rack 10 moves forward, so that the L-shaped rack 10 can drive the pad 8 to move forward along the guide rail 2 into the lower part of the sample template 1, so that the pad 8 covers the bottom of the sample preparation hole 3, and then fill the sample preparation hole 3 with protective slag, and the protective slag falls on the pad 8, and then the button on the button panel 12 controls the electric push rod 14 to shorten, drive the motor 15 to move up, the motor 15 drives the shaft 16 to move up, and the shaft 16 drives the shift block 23 to move upward into the sleeve connection cover 21, The shift block 25 moves out of the gear connection cover 26. At this time, when the rotating shaft 16 rotates clockwise, it can drive the shift block 1 23 to first perform clockwise circular motion. After the shift block 1 23 moves to the horizontal contact with the stopper piece 1 22, it can push the sleeve connection cover 21 to rotate clockwise, and then the sleeve connection cover 21 drives the external threaded sleeve 17 to rotate clockwise. At this time, the external threaded sleeve 17 is threadedly matched with the nut 18, and then the nut 18 can drive the guide block 20 to move downward along the guide groove 19, so that the guide block 20 can drive the lifting plate 4 to move downward, and the lifting plate 4 drives the hollow mold The tool 5 moves down and plugs into the sample template 1, so that the nozzle 13 is inserted into the sample preparation hole 3 one by one, and then the nitrogen delivery pump is started to input nitrogen into the hollow mold 5 along the nitrogen delivery pipe 7 and the connecting pipe 6. In this way, the nozzle 13 sprays nitrogen into the sample preparation hole 3 to apply air pressure to the protective slag. After 2s-5s, the nitrogen delivery pump is turned off to complete the shaping of the protective slag sample, and then the pad 8 is driven by the driving device to move out of the lower part of the sample template 1. At this time, there is no obstacle under the sample preparation hole 3. The nitrogen delivery pump is started again, and the nitrogen is used to push the protective slag sample downward to complete the sample preparation.

[0036] See also Figure 1-Figure 6 A method for preparing a sample of mold protection slag, based on the above-mentioned device for preparing a sample of mold protection slag, specifically comprises the following steps:

[0037] S1, control the driving device through the button panel 12 to drive the pad 8 to move forward into the lower part of the sample template 1, and fill the protective slag into the sample preparation hole 3;

[0038] S2, control the driving device through the button panel 12 to drive the hollow mold 5 to move downward, so that the nozzle 13 is inserted into the sample preparation hole 3;

[0039] S3, start the nitrogen delivery pump, input nitrogen into the hollow mold 5, and the nozzle 13 sprays nitrogen into the sample preparation hole 3 to apply air pressure to the protective slag. After 2s-5s, turn off the nitrogen delivery pump to complete the shaping of the protective slag sample;

[0040] S4. After the protective slag sample is shaped, the driving device is controlled by the button panel 12 to drive the pad 8 and move it out from the lower part of the sample template 1, and the nitrogen delivery pump is started again to use nitrogen to push the protective slag sample downward to complete the sample preparation.

[0041] In summary, by improving the traditional punch that applies pressure to the protective slag by filling the sample preparation hole 3 with nitrogen, the nitrogen gas pressure applies pressure to the protective slag, and the sampling of the protective slag is completed. There is no need to subsequently clean the mold, which reduces the workload of the staff. In addition, since alcohol needs to be used for blending when making the sample, and alcohol is volatile, nitrogen can prevent the alcohol in the sample from evaporating, thereby avoiding drying of the sample. After the sample is prepared, there is no need to move the hollow mold 5 up again to take the sample, and the operation is simpler and more convenient.

Claims

1. A mold protection slag sample preparation device, comprising a sample template (1) and a hollow mold (5), wherein the hollow mold (5) is arranged above the sample template (1), a plurality of sample preparation holes (3) are opened at the upper end of the sample template (1), and a lifting plate (4) is fixed at the upper end of the hollow mold (5), characterized in that: Two guide rails (2) are symmetrically fixed on the left and right sides of the lower end of the sample template (1), a pad (8) is slidably connected between the guide rails (2), an L-shaped rack (10) is fixed to the rear side of the right end of the pad (8), a driving device is fixedly installed on the rear side of the right end of the sample template (1), the L-shaped rack (10) is located below the driving device and is meshed with the driving device, the driving device drives the pad (8) to move forward and backward by meshing with the L-shaped rack (10), and the lifting plate (4) is connected to the driving device. The hollow mold (5) is connected to a driving device, the driving device drives the hollow mold (5) to move up and down, a plurality of nozzles (13) in communication with the hollow mold (5) are fixed at the lower end of the hollow mold (5), the nozzles (13) are plugged into the sample preparation holes (3) one by one in an upper and lower correspondence, a connecting pipe (6) is fixed through the upper end of the lifting plate (4), the connecting pipe (6) is fixed and communicated with the hollow mold (5), the end of the connecting pipe (6) is connected to a nitrogen delivery pipe (7), and the end of the nitrogen delivery pipe (7) is connected to a nitrogen delivery pump.

2. A mold protection slag sample preparation device according to claim 1, characterized in that: A sealing gasket (9) is fixedly connected to the upper end of the pad (8), and the upper surface of the sealing gasket (9) is seamlessly fitted to the lower surface of the sample template (1).

3. A mold protection slag sample preparation device according to claim 1, characterized in that: The driving device comprises a hollow column (11), a button panel (12), an electric push rod (14), a motor (15), a rotating shaft (16), an externally threaded sleeve (17), a nut (18), a shaft (28) and a gear (29); the hollow column (11) is fixed to the sample template (1); a cylindrical inner cavity is provided inside the hollow column (11); the button panel (12) is fixedly mounted on the right end of the hollow column (11); the electric push rod (14) is fixedly mounted on the top of the cylindrical inner cavity; a mounting seat is fixedly mounted on the lower driving end of the electric push rod (14); the motor (15) is fixedly mounted on the lower end of the mounting seat; the button panel (12) is electrically connected to the electric push rod (14) and the motor (15).

4. A mold protection slag sample preparation device according to claim 3, characterized in that: The rotating shaft (16) is connected to the driving end of the motor (15), the externally threaded sleeve (17) bearing is connected to the inside of the cylindrical inner cavity, the externally threaded sleeve (17) is sleeved on the outside of the rotating shaft (16), a sleeve connecting cover (21) is fixed to the inner wall of the externally threaded sleeve (17), a stopper sheet (22) is fixed to one side of the inner wall of the sleeve connecting cover (21), spring grooves (30) are opened on both sides of the outer wall of the rotating shaft (16), a shifting block (23) is slidably connected inside the spring groove (30), a spring is fixedly connected between the lower end of the shifting block (23) and the bottom end of the spring groove (30), and the shifting block (23) abuts against the stopper sheet (22).

5. A mold protection slag sample preparation device according to claim 4, characterized in that: The nut (18) is threadedly connected to the outside of the external threaded sleeve (17); the left end of the nut (18) is fixedly connected to a guide block (20); the left end of the hollow column (11) is provided with a guide groove (19); the left part of the guide block (20) extends out of the guide groove (19) and is welded and fixed to the lifting plate (4).

6. A mold protection slag sample preparation device according to claim 4, characterized in that: The lower part of the rotating shaft (16) is fixedly connected with a rotating block (24), and two spring grooves (31) are provided on both sides of the outer wall of the rotating block (24). The second spring groove (31) is slidably connected with a second shifting block (25), and a second spring is fixedly connected between the upper end of the second shifting block (25) and the top end of the second spring groove (31). The bottom of the cylindrical inner cavity is rotatably connected with a gear connecting cover (26), and a second stopper sheet (27) is fixed on one side of the inner wall of the gear connecting cover (26), and the second shifting block (25) abuts against the second stopper sheet (27).

7. A mold protection slag sample preparation device according to claim 6, characterized in that: The shaft (28) bearing is connected to the lower end of the hollow column (11), the gear (29) is fixed to the lower end of the shaft (28), the upper end of the shaft (28) is fixedly connected to the lower end of the gear connection cover (26), and the L-shaped rack (10) is located on one side of the gear (29) and is meshed with the gear (29).

8. A method for preparing a sample of mold powder, based on a device for preparing a sample of mold powder according to any one of claims 1 to 7, characterized in that: The specific steps include: S1, controlling the driving device through the button panel (12) to drive the pad (8) to move forward into the lower part of the sample template (1), and filling the protective slag into the sample preparation hole (3); S2, controlling the driving device through the button panel (12) to drive the hollow mold (5) to move downward, so that the nozzle (13) is inserted into the sample preparation hole (3); S3, start the nitrogen delivery pump to input nitrogen into the hollow mold (5), and the nozzle (13) sprays nitrogen into the sample preparation hole (3) to apply air pressure to the protective slag. After 2s-5s, turn off the nitrogen delivery pump to complete the shaping of the protective slag sample; S4. After the protective slag sample is shaped, the driving device is controlled by the button panel (12) to drive the pad (8) and move it out of the lower part of the sample template (1). The nitrogen delivery pump is started again, and the protective slag sample is pushed downward by nitrogen to complete the sample preparation.

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