Inverting sand pouring device for forming crucible of vacuum induction melting furnace and sand pouring method thereof

Abstract

The present invention discloses a sand pouring device and a sand pouring method for forming a crucible in a vacuum induction melting furnace. The device includes a sand pouring cart, a leveling shovel, a crucible cover, and a sand bag. The sand pouring cart is arranged above the crucible cover, the leveling shovel is arranged on one side of the sand pouring cart, and the sand bag is connected to the sand pouring cart. The method includes the following steps: making the furnace bottom, pushing the leveling shovel along the inner wall of the furnace body, and the leveling shovel drives the sand pouring cart to move in a circular motion along the edge of the furnace body, and the dry vibration material falls from the open end of the sand bag along the inner wall of the furnace body to the bottom of the furnace body; making the furnace lining, lifting the formed crucible into the furnace body, installing the crucible cover on the formed crucible, transferring the sand pouring cart onto the crucible cover, pushing the leveling shovel to make the rotating shaft of the sand pouring cart move in a circular motion along the inner wall of the circular groove, and the leveling shovel drives the sand pouring cart to move in a circular motion on the crucible cover, and the dry vibration material falls from the open end of the sand bag into the cavity between the furnace body and the crucible. The present invention can prevent dust from being generated due to a large pouring drop of the dry vibration material, and the material is evenly laid when making the furnace lining.

Description

Technical Field

[0001] The invention belongs to the technical field of forming crucible furnace building for vacuum induction melting furnaces, and particularly relates to a sand pouring device and a sand pouring method for forming crucible furnace building of a vacuum induction melting furnace. Background Art

[0002] As is well known, a vacuum induction melting furnace utilizes a closed metal conductor to cut magnetic induction lines in a magnetic field, generating eddy currents on the surface of the metal conductor. Due to the skin effect and Joule's law, heat is generated in the metal conductor, and when it reaches the melting point, the metal conductor finally melts. The metal conductor is placed in a forming crucible for smelting, and a layer of furnace lining needs to be built between the common forming crucible and the furnace body of the vacuum induction melting furnace to prevent steel leakage and protect the induction coil. The materials used for building the furnace lining consist of dry materials and wet materials. The dry materials mainly consist of refractory aggregates, powders, binders, sintering agents, and additives. Although appropriately increasing the proportion of medium particles and fine particles can increase the bulk density of the dry materials, thereby improving their erosion resistance and heat conduction performance, a large amount of dust will be generated during the actual furnace building process, which will have a certain impact on the environment and the human body.

[0003] The existing method for building the furnace lining of the forming crucible of a vacuum induction melting furnace is that the operator stands on the edge of the induction coil furnace body and manually pours sand and vibrates the sand into the gap between the melting furnace and the forming crucible. Since the height of the forming crucible is as high as 2 m, when pouring sand, due to the large drop, flying dust will be generated, which will have a greater impact on the environment and human health. Moreover, when manually pouring sand, the amount of sand poured cannot be evenly controlled, resulting in inconsistent heights of the dry vibrated materials of the furnace lining, and thus affecting the compactness after vibration. Therefore, it is necessary to design a sand pouring device and a sand pouring method for forming crucible furnace building of a vacuum induction melting furnace to facilitate sand pouring, evenly spread the materials, reduce dust, improve the working environment, and improve work efficiency, etc.

[0004] The invention patent with the publication number of CN113074550A discloses a method for building a crucible of a vacuum induction melting furnace, including the following steps: fixing the coil; preparing sand materials A and B with high-purity quartz sand and binder; building the furnace bottom with sand material A; knotting the furnace lining bottom and furnace wall with furnace lining materials; when knotting to the upper end of the second coil from top to bottom, knotting the furnace mouth with sand material B until reaching the top of the coil to obtain a newly built crucible; baking to obtain the crucible of the vacuum induction melting furnace; sand material A is composed of the following components in parts by weight: 86-88 parts of high-purity quartz sand and 12-14 parts of binder, and sand material B is composed of the following components in parts by weight: 75-77 parts of high-purity quartz sand and 23-25 parts of binder. This technical solution improves the sinterability and compactness of the crucible by preparing different sand materials for building the furnace bottom, furnace wall and furnace mouth, but does not record the method of pouring sand into the gap between the melting furnace and the crucible. If dry vibration materials are poured, it will generate a large amount of dust, which is harmful to the environment and human body. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a sand pouring device for building a formed crucible of a vacuum induction melting furnace, including a sand pouring cart, a leveling shovel, a crucible cover and a sand bag. The sand pouring cart is arranged above the crucible cover, the leveling shovel is arranged on one side of the sand pouring cart, and the sand bag is connected to the sand pouring cart.

[0006] Preferably, the sand pouring cart includes a sand storage box, a rotating shaft, a first cross beam, a second cross beam, a first vertical column, a second vertical column, rollers, a fixing plate and a sand outlet cylinder; the sand storage box is composed of two rectangular sides, a circular arc side and a fan-shaped bottom surface. The first cross beam and the second cross beam are respectively arranged on the two rectangular sides of the sand storage box. One end of the first cross beam and one end of the second cross beam meet to form a meeting end. The other end of the first cross beam and the other end of the second cross beam are respectively vertically connected to the top ends of the first vertical column and the second vertical column. A roller is respectively arranged at the bottom ends of the first vertical column and the second vertical column, and the rollers slide on the crucible cover.

[0007] In any of the above solutions preferably, the top end of the rotating shaft is fixedly connected to the meeting end of the first cross beam and the second cross beam, and the bottom end of the rotating shaft slides on the crucible cover.

[0008] In any of the above solutions preferably, a fixing plate is respectively arranged at the end of the first cross beam far from the meeting end and at a position close to the bottom of the first vertical column. Through holes with the same shape and size are respectively arranged on the two fixing plates, and the axes of the two through holes coincide and are perpendicular to the horizontal plane where the crucible cover is located.

[0009] Preferably, in any of the above solutions, the sand discharging cylinder is inclined and arranged at the central part where the sector bottom surface and the arc-shaped side surface of the sand storage box intersect. A circulation valve is arranged on the sand discharging cylinder, and the sand discharging port of the sand discharging cylinder is fixedly connected to the sand bag.

[0010] Preferably, in any of the above solutions, the leveling shovel includes a shovel handle, a shovel plate, and comb teeth; the bottom end of the shovel handle is vertically arranged at the central part of the shovel plate. The shovel plate is composed of a flat plate and two vertical plates. The two vertical plates are respectively vertically arranged at both ends of the flat plate. The flat plate is in an arc shape, and comb teeth are respectively arranged at the bottom ends of the two vertical plates.

[0011] Preferably, in any of the above solutions, the shovel handle of the leveling shovel is inserted into the through holes of the two fixing plates of the sand pouring vehicle.

[0012] Preferably, in any of the above solutions, the crucible cover includes a circular cover plate, a circular groove, and four arc-shaped fixing pieces; a trapezoidal support plate is arranged at the edge part of the circular cover plate. The circular groove is arranged at the central part of the upper surface of the circular cover plate, and four arc-shaped fixing pieces are equidistantly arranged at the edge part close to the lower surface of the circular cover plate.

[0013] Preferably, in any of the above solutions, the crucible cover is installed at the open end of the formed crucible.

[0014] The present invention also provides a sand pouring method for the bottom beating of the formed crucible of a vacuum induction melting furnace, using the sand pouring device for the bottom beating of the formed crucible of the vacuum induction melting furnace described in any one of the above. According to the sequence, it includes the following steps:

[0015] Step 1: Place the sand pouring vehicle on the edge of the furnace body of the vacuum induction melting furnace. Insert the shovel handle of the leveling shovel into the through holes of the two fixing plates of the sand pouring vehicle, and sink the shovel plate and comb teeth of the leveling shovel along the inner wall of the furnace body of the vacuum induction melting furnace to the bottom of the furnace body. Install the sand bag at the sand discharging port of the sand discharging cylinder of the sand pouring vehicle, and put the open end of the sand bag along the inner wall of the furnace body of the vacuum induction melting furnace into the furnace body. Pour dry vibration material into the sand storage box until it is full.

[0016] Step 2: Push the leveling shovel along the inner wall of the furnace body of the vacuum induction melting furnace. The leveling shovel drives the sand pouring vehicle to make a circular motion along the edge of the furnace body of the vacuum induction melting furnace. Open the circulation valve to make the dry vibration material in the sand storage box flow into the sand bag and flow down along the inner wall of the furnace body from the open end of the sand bag and fall to the bottom of the furnace body.

[0017] Step 3: During the process of pushing the leveling shovel, the comb teeth of the leveling shovel spread the dry vibration material falling to the bottom of the furnace body evenly. When the dry vibration material at the bottom of the furnace body reaches a certain height, close the circulation valve, and then vibrate the dry vibration material solid to complete the bottom beating of the formed crucible of the vacuum induction melting furnace.

[0018] Step 4: Lift the formed crucible into the interior of the vacuum induction melting furnace, align the central axis of the formed crucible with the central axis of the vacuum induction melting furnace, install the crucible cover at the open end of the formed crucible, and fix the crucible cover on the formed crucible through four arc-shaped fixing pieces on the lower surface of the crucible cover;

[0019] Step 5: Move the sand pouring cart to the crucible cover, place the rotating shaft of the sand pouring cart in the circular groove on the upper surface of the crucible cover, sink the shovel plate and comb teeth of the leveling shovel into the cavity formed between the vacuum induction melting furnace and the formed crucible, put the open end of the sand bag into the cavity formed between the vacuum induction melting furnace and the formed crucible, and fill the sand storage box with dry vibration material;

[0020] Step 6: Push the leveling shovel to make the rotating shaft of the sand pouring cart move in a circular motion along the inner wall of the circular groove. The leveling shovel drives the sand pouring cart to move in a circular motion on the crucible cover. Open the flow valve to allow the dry vibration material in the sand storage box to flow into the sand bag and flow down from the open end of the sand bag into the cavity formed between the vacuum induction melting furnace and the formed crucible;

[0021] Step 7: During the process of pushing the leveling shovel, the comb teeth of the leveling shovel spread the dry vibration material falling into the cavity formed between the vacuum induction melting furnace and the formed crucible evenly. As the height of the dry vibration material increases, gradually lift the leveling shovel upward. When the cavity formed between the vacuum induction melting furnace and the formed crucible is filled with dry vibration material, close the flow valve, and then vibrate the dry vibration material solid, and the lining of the formed crucible of the vacuum induction melting furnace can be completed.

[0022] In the present invention, the angle formed by the intersection of the two rectangular sides of the sand storage box is 30 - 60°, and the angle can be adjusted according to the actual situation; the sand bag is a long strip cylindrical cloth bag; the flow valve is used to control the flow direction and flow rate of the sand; the four arc-shaped fixing pieces on the lower surface of the crucible cover can prevent the crucible cover from moving at the open end of the formed crucible. The vacuum induction melting furnace, formed crucible, equipment for vibrating dry vibration material, etc. involved in the present invention are all traditional equipment, and no special limitations are imposed on the equipment model, vibration process, dry vibration material formula, etc.

[0023] The sand pouring device and its sand pouring method for the formed crucible of the vacuum induction melting furnace of the present invention have the following beneficial effects:

[0024] (1) During the bottom lining and furnace lining making processes of the formed crucible of the vacuum induction melting furnace, it can prevent dust from being generated due to a large drop during the pouring of dry vibration material, reduce environmental pollution, and at the same time reduce the physical harm caused to operators by inhaling dust.

[0025] (2) By using a flow valve in cooperation with a uniformly pushed leveling shovel, the dry vibration material can be evenly paved. When making the furnace lining, the height of the entire circumference of each making can be made uniform, saving the time for repeated feeding operations caused by inconsistent heights, improving the overall efficiency of crucible making, and reducing the labor intensity of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic structural diagram of a preferred embodiment of a sand pouring device for forming a crucible in a vacuum induction melting furnace according to the present invention;

[0027] Figure 2 is Figure 1 a schematic perspective view of a sand pouring cart in the illustrated embodiment;

[0028] Figure 3 is Figure 1 a front view of the sand pouring cart in the illustrated embodiment;

[0029] Figure 4 is Figure 1 a rear view of the sand pouring cart in the illustrated embodiment;

[0030] Figure 5 is Figure 1 a top view of the sand pouring cart in the illustrated embodiment;

[0031] Figure 6 is Figure 1 a schematic perspective view of the leveling shovel in the illustrated embodiment;

[0032] Figure 7 is Figure 1 a top view of the leveling shovel in the illustrated embodiment;

[0033] Figure 8 is Figure 1 a schematic perspective view of the crucible cover in the illustrated embodiment;

[0034] Figure 9 is Figure 1 a bottom view of the crucible cover in the illustrated embodiment.

[0035] Description of the reference numerals in the figures:

[0036] 1 - sand pouring cart, 101 - sand storage box, 102 - rotating shaft, 103 - first cross beam, 104 - second cross beam, 105 - first column, 106 - second column, 107 - roller, 108 - fixing plate, 109 - sand outlet tube, 110 - intersection end, 111 - through hole, 112 - flow valve;

[0037] 2 - leveling shovel, 201 - shovel handle, 202 - shovel plate, 203 - comb teeth;

[0038] 3 - Crucible cover, 301 - Circular cover plate, 302 - Circular groove, 303 - Arc-shaped fixing piece, 304 - Trapezoidal support plate;

[0039] 4 - Sandbag. Specific implementation mode

[0040] In order to further understand the content of the present invention, the present invention will be described in detail below in conjunction with specific embodiments.

[0041] As Figure 1-9 shown, according to a preferred embodiment of the sand pouring device for forming a crucible in a vacuum induction melting furnace according to the present invention, it includes a sand pouring cart 1, a leveling shovel 2, a crucible cover 3 and a sandbag 4. The sand pouring cart 1 is arranged above the crucible cover 2, the leveling shovel 3 is arranged on one side of the sand pouring cart 1, and the sandbag 4 is connected to the sand pouring cart 1.

[0042] The sand pouring cart 1 includes a sand storage box 101, a rotating shaft 102, a first cross beam 103, a second cross beam 104, a first column 105, a second column 106, rollers 107, a fixing plate 108 and a sand outlet tube 109. The sand storage box 101 is composed of two rectangular sides, an arc-shaped side and a fan-shaped bottom surface. The first cross beam 103 and the second cross beam 104 are respectively arranged on the two rectangular sides of the sand storage box 101. One end of the first cross beam 103 and one end of the second cross beam 104 meet to form a meeting end 110. The other end of the first cross beam 103 and the other end of the second cross beam 104 are respectively vertically connected to the top of the first column 105 and the top of the second column 106. A roller 107 is respectively arranged at the bottom end of the first column 105 and the bottom end of the second column 106, and the roller 107 slides on the crucible cover 3.

[0043] The top end of the rotating shaft 102 is fixedly connected to the meeting end 110 of the first cross beam 103 and the second cross beam 104, and the bottom end of the rotating shaft 102 slides on the crucible cover 3. A fixing plate 108 is respectively arranged at the position of the first cross beam 103 far from the meeting end 110 and the position of the first column 105 close to its bottom. Through holes 111 with the same shape and size are respectively arranged on the two fixing plates 108. The axes of the two through holes 111 coincide and are perpendicular to the horizontal plane where the crucible cover 3 is located. The sand outlet tube 109 is obliquely arranged at the central part where the fan-shaped bottom surface of the sand storage box 101 intersects with the arc-shaped side surface. A flow valve 112 is arranged on the sand outlet tube 109, and the sand outlet of the sand outlet tube 109 is fixedly connected to the sandbag 4.

[0044] The leveling shovel 2 includes a shovel handle 201, a shovel plate 202, and comb teeth 203; the bottom end of the shovel handle 201 is vertically arranged at the central part of the shovel plate 202. The shovel plate 202 is composed of a flat plate and two vertical plates. The two vertical plates are respectively vertically arranged at both ends of the flat plate. The flat plate is in an arc shape, and the comb teeth 203 are respectively arranged at the bottom ends of the two vertical plates. The shovel handle 201 of the leveling shovel 2 is inserted into the through holes 111 of the two fixing plates 108 of the sand pouring cart 1.

[0045] The crucible cover 3 includes a circular cover plate 301, a circular groove 302, and four arc-shaped fixing pieces 303; a trapezoidal support plate 304 is arranged at the edge part of the circular cover plate 301, the circular groove 302 is arranged at the central part of the upper surface of the circular cover plate 301, and four arc-shaped fixing pieces 303 are equidistantly arranged at the edge part of the lower surface of the circular cover plate 301. The crucible cover 3 is installed at the open end of the formed crucible.

[0046] This embodiment also provides a sand pouring method for the bottom pouring of a formed crucible of a vacuum induction melting furnace, using the above-mentioned sand pouring device for the bottom pouring of a formed crucible of a vacuum induction melting furnace, which includes the following steps in sequence:

[0047] Step 1: Place the sand pouring cart on the edge of the furnace body of the vacuum induction melting furnace, insert the shovel handle of the leveling shovel into the through holes of the two fixing plates of the sand pouring cart, and sink the shovel plate and comb teeth of the leveling shovel along the inner wall of the furnace body of the vacuum induction melting furnace to the bottom of the furnace body. Install the sand bag at the sand outlet of the sand discharging cylinder of the sand pouring cart, and put the open end of the sand bag along the inner wall of the furnace body of the vacuum induction melting furnace into the furnace body, and fill the sand storage box with dry vibration material.

[0048] Step 2: Push the leveling shovel along the inner wall of the furnace body of the vacuum induction melting furnace. The leveling shovel drives the sand pouring cart to make a circular motion along the edge of the furnace body of the vacuum induction melting furnace. Open the flow valve to make the dry vibration material in the sand storage box flow into the sand bag, and flow down along the inner wall of the furnace body of the vacuum induction melting furnace from the open end of the sand bag and fall to the bottom of the furnace body.

[0049] Step 3: During the process of pushing the leveling shovel, the comb teeth of the leveling shovel spread the dry vibration material falling to the bottom of the furnace body evenly. When the dry vibration material at the bottom of the furnace body reaches a certain height, close the flow valve, and then vibrate the dry vibration material solid, then the bottom pouring of the formed crucible of the vacuum induction melting furnace can be completed.

[0050] Step 4: Lift the formed crucible into the furnace body of the vacuum induction melting furnace to make the central axis of the formed crucible coincide with the central axis of the vacuum induction melting furnace. Install the crucible cover at the open end of the formed crucible, and fix the crucible cover on the formed crucible through the four arc-shaped fixing pieces on the lower surface of the crucible cover.

[0051] Step Five: Transfer the sand pouring cart to the crucible cover, place the rotating shaft of the sand pouring cart in the circular groove on the upper surface of the crucible cover, sink the shovel plate and comb teeth of the leveling shovel into the cavity formed between the vacuum induction melting furnace and the forming crucible, put the open end of the sand bag into the cavity formed between the vacuum induction melting furnace and the forming crucible, and fill the sand storage box with dry vibration material.

[0052] Step Six: Push the leveling shovel to make the rotating shaft of the sand pouring cart move in a circular motion along the inner wall of the circular groove. The leveling shovel drives the sand pouring cart to move in a circular motion on the crucible cover. Open the flow valve to allow the dry vibration material in the sand storage box to flow into the sand bag and flow down from the open end of the sand bag into the cavity formed between the vacuum induction melting furnace and the forming crucible.

[0053] Step Seven: During the process of pushing the leveling shovel, the comb teeth of the leveling shovel spread the dry vibration material falling into the cavity formed between the vacuum induction melting furnace and the forming crucible evenly. As the height of the dry vibration material increases, gradually lift the leveling shovel upward. When the cavity formed between the vacuum induction melting furnace and the forming crucible is filled with dry vibration material, close the flow valve, and then vibrate the dry vibration material solid, thus completing the lining beating of the forming crucible of the vacuum induction melting furnace.

[0054] In this embodiment, the angle formed by the intersection of the two rectangular sides of the sand storage box is 30 - 60°, and the angle can be adjusted according to the actual situation; the sand bag is a long strip cylindrical cloth bag; the flow valve is used to control the flow direction and flow rate of the sand discharge; the four arc-shaped fixing pieces on the lower surface of the crucible cover can prevent the crucible cover from moving at the open end of the forming crucible. The vacuum induction melting furnace, forming crucible, equipment for vibrating the dry vibration material, etc. involved in this embodiment are all traditional equipment, and no special restrictions are imposed on the equipment model, vibration process, dry vibration material formula, etc.

[0055] The sand pouring device and its sand pouring method for the forming crucible of the vacuum induction melting furnace in this embodiment have the following beneficial effects: During the bottom beating and lining beating of the forming crucible of the vacuum induction melting furnace, it can prevent dust from being generated due to a large drop when pouring the dry vibration material, reduce environmental pollution, and at the same time reduce the physical harm to the operator caused by inhaling dust; by using a flow valve in cooperation with a uniformly hand-pushed leveling shovel, the dry vibration material can be spread evenly. When beating the lining, the height of the entire circumference of each beating can be made uniform, saving the time of repeated feeding operations due to inconsistent heights, improving the overall efficiency of crucible beating, and reducing the labor intensity of the operator.

[0056] Special Note: In the technical solution of the present invention, many parameters are involved. It is necessary to comprehensively consider the synergistic effects among various parameters to obtain the beneficial effects and remarkable progress of the present invention. Moreover, the value ranges of each parameter in the technical solution are obtained through a large number of experiments. For each parameter and the mutual combination of various parameters, the inventor has recorded a large amount of experimental data. Due to space limitations, the specific experimental data are not disclosed herein.

[0057] It is not difficult for those skilled in the art to understand that the sand pouring device and its sand pouring method for the forming crucible of the vacuum induction melting furnace in the present invention include any combination of the above-mentioned invention content, specific implementation part of the present invention specification, and each part shown in the drawings. Due to space limitations and to make the specification concise, the various solutions formed by these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An inverted sand pouring device for forming a crucible in a vacuum induction melting furnace, characterized in that: It includes a sand - pouring cart, a leveling shovel, a crucible cover, and sand bags. The sand - pouring cart is arranged above the crucible cover. The leveling shovel is arranged on one side of the sand - pouring cart. The sand bags are connected to the sand - pouring cart; The sand - pouring cart includes a sand storage box, a rotating shaft, a first cross - beam, a second cross - beam, a first vertical column, a second vertical column, rollers, a fixing plate, and a sand outlet tube. The sand storage box is composed of two rectangular sides, one arc - shaped side, and one sector - shaped bottom surface. The first cross - beam and the second cross - beam are respectively arranged on the two rectangular sides of the sand storage box. One end of the first cross - beam and one end of the second cross - beam meet to form a meeting end. The other end of the first cross - beam and the other end of the second cross - beam are respectively vertically connected to the top of the first vertical column and the top of the second vertical column. A roller is respectively arranged at the bottom of the first vertical column and the bottom of the second vertical column. The rollers slide on the crucible cover; The top of the rotating shaft is fixedly connected to the meeting end of the first cross - beam and the second cross - beam, and the bottom of the rotating shaft slides on the crucible cover; One end of the first cross - beam far from the meeting end and a position near the bottom of the first vertical column are respectively provided with a fixing plate. Through - holes with the same shape and size are respectively arranged on the two fixing plates. The axes of the two through - holes coincide and are perpendicular to the horizontal plane where the crucible cover is located; The sand outlet tube is inclined and arranged at the central part where the sector - shaped bottom surface and the arc - shaped side of the sand storage box intersect. A flow valve is arranged on the sand outlet tube. The sand outlet of the sand outlet tube is fixedly connected to the sand bag.

2. The sand pouring device for the forming crucible of the vacuum induction melting furnace according to claim 1, characterized in that: The leveling shovel includes a shovel handle, a shovel plate, and comb teeth. The bottom end of the shovel handle is vertically arranged at the central part of the shovel plate. The shovel plate is composed of a flat plate and two vertical plates. The two vertical plates are respectively vertically arranged at both ends of the flat plate. The flat plate is in an arc shape. Comb teeth are respectively arranged at the bottom ends of the two vertical plates.

3. The sand pouring device for the forming crucible of the vacuum induction melting furnace according to claim 2, characterized in that: The shovel handle of the leveling shovel is inserted into the through - holes of the two fixing plates of the sand - pouring cart.

4. The sand pouring device for forming a crucible for a vacuum induction melting furnace according to claim 3, characterized in that: The crucible cover includes a circular cover plate, a circular groove, and four arc - shaped fixing pieces. A trapezoidal support plate is arranged at the edge part of the circular cover plate. A circular groove is arranged at the central part of the upper surface of the circular cover plate. Four arc - shaped fixing pieces are equidistantly arranged near the edge part of the lower surface of the circular cover plate.

5. The sand pouring device for the crucible forming and furnace building of the vacuum induction melting furnace according to claim 4, characterized in that: The crucible cover is installed at the open end of the formed crucible.

6. A sand pouring method for forming a crucible for a vacuum induction melting furnace when starting up the furnace, characterized in that: When using the sand - pouring device for the crucible of the vacuum induction melting furnace forming crucible as described in any one of claims 1 - 5, it includes the following steps in sequence, Step 1: Place the sand - pouring cart on the edge of the furnace body of the vacuum induction melting furnace. Insert the shovel handle of the leveling shovel into the through - holes of the two fixing plates of the sand - pouring cart. Then sink the shovel plate and comb teeth of the leveling shovel along the inner wall of the furnace body of the vacuum induction melting furnace to the bottom of the furnace body. Install the sand bag at the sand outlet of the sand outlet tube of the sand - pouring cart, and put the open end of the sand bag along the inner wall of the furnace body of the vacuum induction melting furnace into the furnace body. Pour dry vibration material into the sand storage box; Step 2: Push the leveling shovel along the inner wall of the furnace body of the vacuum induction melting furnace. The leveling shovel drives the sand pouring cart to move in a circular motion along the edge of the furnace body of the vacuum induction melting furnace. Open the flow valve to allow the dry vibration material in the sand storage box to flow into the sand bag and flow down along the inner wall of the furnace body of the vacuum induction melting furnace from the open end of the sand bag and fall to the bottom of the furnace body; Step 3: During the process of pushing the leveling shovel, the comb teeth of the leveling shovel spread the dry vibration material falling to the bottom of the furnace body evenly. When the dry vibration material at the bottom of the furnace body reaches a certain height, close the flow valve, and then vibrate the dry vibration material solid to complete the bottom beating of the formed crucible of the vacuum induction melting furnace; Step 4: Lift the formed crucible into the inner part of the furnace body of the vacuum induction melting furnace so that the central axis of the formed crucible coincides with the central axis of the vacuum induction melting furnace. Install the crucible cover at the open end of the formed crucible and fix the crucible cover on the formed crucible through four circular arc fixing pieces on the lower surface of the crucible cover; Step 5: Transfer the sand pouring cart onto the crucible cover so that the rotating shaft of the sand pouring cart is located in the circular groove on the upper surface of the crucible cover. Sink the shovel plate and comb teeth of the leveling shovel into the cavity formed between the vacuum induction melting furnace and the formed crucible. Put the open end of the sand bag into the cavity formed between the vacuum induction melting furnace and the formed crucible, and fill the sand storage box with dry vibration material; Step 6: Push the leveling shovel to make the rotating shaft of the sand pouring cart move in a circular motion along the inner wall of the circular groove. The leveling shovel drives the sand pouring cart to move in a circular motion on the crucible cover. Open the flow valve to allow the dry vibration material in the sand storage box to flow into the sand bag and flow down from the open end of the sand bag and fall into the cavity formed between the vacuum induction melting furnace and the formed crucible; Step 7: During the process of pushing the leveling shovel, the comb teeth of the leveling shovel spread the dry vibration material falling into the cavity formed between the vacuum induction melting furnace and the formed crucible evenly. As the height of the dry vibration material increases, gradually lift the leveling shovel upward. When the cavity formed between the vacuum induction melting furnace and the formed crucible is filled with dry vibration material, close the flow valve, and then vibrate the dry vibration material solid to complete the lining beating of the formed crucible of the vacuum induction melting furnace.

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