Molten iron sampler for intermediate frequency furnace

Abstract

The utility model discloses a molten iron sampler for an intermediate frequency furnace, which is applied to the field of casting. The air cylinder barrel is connected to the upper end of the supporting pipe. The sampling barrel is connected to the lower end of the supporting pipe. The lower end of a cylinder rod is connected with a sampling rod, the lower end of the sampling rod is connected with a sampling plug, the sampling plug is sleeved with a sampling barrel, a sampling chamber is arranged in the middle of the sampling plug and communicated with the outside through evenly-distributed sampling openings, and an exhaust hole is formed in the top of the sampling chamber. In order to reduce heat dissipation, a heat insulation piece is arranged between the sampling barrel and the supporting pipe, and a heat insulation pad is arranged between the sampling rod and a cylinder rod of the air cylinder. During sampling, adverse effects of slag on the surface of molten iron on sampling are avoided, residual iron does not exist in the sampling chamber after sampling, continuous multiple sampling can be realized, and mechanical preparation is made for automatic sampling operation.

Description

TECHNICAL FIELD

[0001] The utility model is applied to the foundry field relates to the preparation of molten iron spectrum in the intermediate frequency furnace, specifically a device for taking molten iron from the intermediate frequency furnace. BACKGROUND

[0002] In the foundry field, the intermediate frequency furnace has become the main equipment for molten iron melting, and the rapid test of molten iron composition currently adopts the spectral method. The artificial sampling spoon takes a spoon of molten iron from the intermediate frequency furnace, pours it into the copper sample mold for rapid solidification, then grinds the spectral analysis surface, and performs spectral rapid analysis on the spectrometer. At present, sample grinding and spectral analysis can be automatically performed, but sampling in the intermediate frequency furnace still needs manual operation, which restricts the production automation in front of the furnace.

[0003] There are many patents related to molten iron sampling devices, such as CN218156568U, CN221745649U, CN217819496U, CN217542189U, CN217424830U, CN217132632U, CN221528057U, etc. Among them, CN218156568U is a new lifting type molten iron slagging machine temperature measuring and sampling device, which utilizes the lifting and telescopic functions of the molten iron slagging machine to realize molten iron temperature measurement and sampling, replacing manual operation; CN221745649U is an ironmaking blast furnace molten iron sampling device for sampling molten iron in the blast furnace; CN217819496U is an automatic molten iron sampling device, which detects the distance of the molten iron liquid surface by camera image recognition and laser range finder, and controls the electric hoist to drive the sampler to automatically sample; CN217542189U is a molten iron temperature measuring and sampling device, which solves the safety problem of blast furnace molten iron temperature measurement and sampling; CN217424830U is a new full-automatic molten iron sampling and temperature measuring device, which controls the lifting of the fixed plate by the electric control cabinet, sets the range finder, temperature measuring gun and sampler on the fixed plate, and completes the lifting displacement of the fixed plate through the interlocking control of the infrared range finder and the central processing unit in the electric control cabinet, thereby realizing stable measurement and sampling and improving the precision of measurement and sampling; CN217132632U is an automatic molten iron quantitative sampling device, which simulates manual operation and transports the molten iron in the ladle to the sample cup through the sampling spoon connected by the mechanical arm. The above sampling devices are not suitable for sampling in the intermediate frequency furnace, or do not consider the influence of slag on sample preparation on the surface of molten iron, or do not describe the structure of the sampler in detail, or do not consider the replacement and service life of the sampler.

[0004] CN109580016A describes a casting sample transfer system. The output end of a second hydraulic cylinder is fixedly connected to a sampling rod, which is also fixedly connected to a sampling plug. The sampling plug is located inside a sampling cylinder and is movably connected to the cylinder. When the sampling rod moves upward, the sampling plug moves upward inside the sampling cylinder, generating pressure that draws molten iron into the cylinder. This application uses suction for sampling, and the sampling plug, acting as a protective plug, has a heat dissipation function. The sample cools and solidifies inside the sampling cylinder, resulting in a solid sample. However, this system has the following drawbacks: 1) Due to the large diameter of the spectral sample, the molten iron inside the sampling cylinder is difficult to stabilize during the upward movement of the sampling tube and may flow downward due to gravity. 2) The shape of the sampling cylinder, i.e., the shape of the solid sample, does not conform to the shape of the copper sample mold for the spectral sample. In other words, it does not conform to the solidification law of molten iron, resulting in a solid sample with many shrinkage cavities or looseness, making spectral composition analysis on a spectrometer impossible. 3) The sampling cylinder cannot be automated as it needs to be replaced each time. CN207610889U is a multi-segment sampler for molten iron detection. The sampling principle is the same as the above application, except for the sampling tube. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a medium-frequency furnace molten iron sampler, which adopts a closed sampling chamber to collect molten iron from the medium-frequency furnace and prepare samples for spectral composition analysis. This avoids the adverse effects of slag on the molten iron surface on sample preparation and prepares for mechanized sampling.

[0006] The technical solution adopted in this utility model is as follows: The medium-frequency furnace molten iron sampler of this utility model includes a cylinder, a sampling rod, a support tube, a sampling cylinder, and a sampling plug. The cylinder barrel is fixedly connected to the upper end of the support tube, and the sampling cylinder is fixedly connected to the lower end of the support tube. The lower end of the cylinder rod is connected to the sampling rod, and the lower end of the sampling rod is connected to the sampling plug. The sampling plug is fitted inside the sampling cylinder, and a sampling chamber is provided in the middle of the sampling plug. The sampling chamber communicates with the outside through a sampling port at the bottom, which is located on the outer circumference of the sampling plug. To facilitate the exhaust of air from the sampling chamber during sampling, an exhaust hole is provided at the top of the sampling chamber.

[0007] Furthermore, the sampling cylinder and the support tube are connected by fasteners, and the fasteners are wrapped with refractory mortar. The fasteners can be made of wedges and smooth rods, and the smooth rods have through holes machined on them to mate with the wedges.

[0008] Furthermore, to facilitate the replacement of the sampling plug, the sampling plug is threadedly connected to the sampling rod.

[0009] Furthermore, to reduce heat dissipation between the sampling cylinder and the support tube, a heat insulation sheet is installed between the sampling cylinder and the support tube.

[0010] Furthermore, to avoid high temperatures on the cylinder rod, a heat insulation pad is provided between the sampling rod and the cylinder rod.

[0011] Further, the bottom surface and the top surface of the sampling chamber are provided with inward protrusions. The opening of the exhaust hole is provided in the top surface groove, and the outlet is provided on the outer circumferential surface of the sampling plug.

[0012] The sampling chamber of the utility model is sealed in the sampling cylinder, and the adverse effects of slag on the surface of molten iron on sampling are eliminated. The sampling cylinder and the sampling plug are made of materials that are not infiltrated by molten iron, and there is no residual iron in the sampling chamber after sampling, so that continuous sampling can be realized. The mechanical action can be combined with the automatic control of the prior art to realize automatic operation of sampling. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of example 1;

[0014] Figure 2 is Figure 1 A-A cross-sectional schematic diagram of the;

[0015] Figure 3 is a support pipe and sampling cylinder connection schematic diagram of example 2;

[0016] Figure 4 is a sampling plug structure schematic diagram of example 3;

[0017] The drawings show that: 1-cylinder rod, 2-heat insulation pad, 3-sampling rod, 4-support pipe, 5-refractory mortar, 6-heat insulation sheet, 7-sampling cylinder, 8-sampling chamber, 9-sampling plug, 10-exhaust hole, 11-fastener, 12-sampling port, 13-iron, 14-light rod bolt. DETAILED DESCRIPTION Example 1

[0018] The structure of the molten iron sampler of the embodiment is shown in the accompanying drawings Figure 1 and the accompanying Figure 2 , including a cylinder, a sampling rod 3, a support pipe 4, a sampling cylinder 7, and a sampling plug 9. The cylinder barrel of the cylinder is fixedly connected to the upper end of the support pipe 4, the sampling cylinder 7 is fixedly connected to the lower end of the support pipe 4, the lower end of the cylinder rod 1 of the cylinder is connected to the sampling rod 3, the lower end of the sampling rod is connected to the sampling plug 9, and the sampling plug 9 is sleeved in the sampling cylinder 7 and can freely move up and down in the sampling cylinder 7. A sampling chamber 8 is arranged in the middle of the sampling plug 9, the bottom of the sampling chamber 8 is communicated with the outside through a sampling port 12, and the sampling port 12 is uniformly arranged on the outer circumferential surface of the sampling plug 9.

[0019] In order to replace the sampling cylinder 7 conveniently, the sampling cylinder 7 is connected with the supporting tube 4 by fasteners 11, which are bolts and nuts in this embodiment. In order to protect the fasteners 11, the fasteners 11 are wrapped with refractory mortar 5. In order to replace the sampling plug 9 conveniently, the sampling plug 9 is connected with the sampling rod 3 by threads. In order to reduce the heat transfer between the sampling cylinder 7 and the supporting tube 4, the heat insulation sheet 6 is arranged between the sampling cylinder 7 and the supporting tube 4. In order to reduce the heat transfer between the sampling rod 3 and the cylinder rod 1, the heat insulation pad 2 is arranged between the sampling rod 3 and the cylinder rod 1. In order to exhaust the air in the sampling chamber 8 when sampling, a plurality of small exhaust holes 10 are arranged on the top of the sampling chamber 8. The size of the exhaust holes 10 is small, and the molten iron cannot block the exhaust holes due to the non-wetting property of the molten iron. The length of the sampling cylinder is set according to the sampling depth, so that only the sampling cylinder is inserted into the molten iron. The sampling chamber is set according to the size of the spectral sample mold, so that the spectral sample can be formed.

[0020] When the sampling cylinder and the sampling plug are roasted before use, the heat insulation sheet prevents the heat transfer from the sampling cylinder to the supporting tube. Even if there is heat transfer, the supporting tube can dissipate heat to the surrounding environment, and the temperature of the supporting tube will not be higher than 150℃, so the strength of the supporting tube will not be affected. The sampling plug transfers heat to the cylinder rod through the sampling rod and the heat insulation pad. The sampling rod is made of refractory material, and the heat conductivity of the sampling rod is small. The heat conductivity of the heat insulation pad is smaller. Therefore, the temperature of the cylinder rod is close to room temperature. When the sampling cylinder and the sampling plug are roasted and red, the sampling plug is retracted into the sampling cylinder. The supporting tube drives the sampling cylinder to move downward, and the sampling cylinder enters the molten iron in the intermediate frequency furnace. Since the sampling chamber is closed, the slag on the surface of the molten iron cannot enter the sampling chamber. When the sampling cylinder is inserted into the molten iron below the liquid level, the supporting tube stops moving downward. The cylinder rod drives the sampling plug to move downward through the sampling rod. The sampling port is inserted into the molten iron. The molten iron enters the sampling chamber through the sampling port. The air in the sampling chamber is exhausted from the exhaust holes under the pressure of the molten iron. After the sampling chamber is filled with the molten iron, the cylinder rod is returned to the original position, and the sampling plug enters the sampling cylinder. The molten iron in the sampling chamber is stable in liquid state and will not solidify. Then the supporting tube moves upward, and the sampling cylinder moves out of the intermediate frequency furnace and reaches above the copper sample mold. The sampling plug is extended again, and the molten iron in the sampling chamber flows into the copper sample mold and solidifies rapidly to form the spectral sample.

[0021] The sampling cylinder and the sampling plug are preferably made of refractory material which is not wetted by the molten iron, such as aluminum-silicon-chromium material. The main components include alumina, silica, chromium oxide and zirconia, etc. The material has good thermal shock stability and anti-molten iron wetting property, and can effectively prevent the molten iron from entering the gap. When the sampling cylinder is inserted into the molten iron, the molten iron cannot enter the gap between the sampling plug and the sampling cylinder. The molten iron in the sampling chamber cannot enter the exhaust holes and block them due to the non-wetting property of the sampling cylinder. The sampling cylinder and the sampling plug can also be made of silicon carbide, boron carbide and other materials. The sampling rod is preferably made of refractory material with small heat transfer coefficient. The heat insulation pad and the heat insulation sheet are preferably made of aerosol type heat insulation material. Embodiment 2

[0022] The fastener in embodiment 1 adopts bolt and nut, although fastener is easy to obtain, but installation is inconvenient, and high temperature oxidation damages screw thread, and affects service life of fastener, the fastener is changed to contract iron and light rod bolt structure in the embodiment, as shown in the accompanying drawings Figure 3 The through hole is machined on the light rod bolt 14, the through hole is matched with the contract iron 13, the contract iron 13 is inserted into the through hole, and the fixing of the support pipe 4 and the sampling cylinder 7 can be realized. The contract iron is fixed and loosened by knocking, and installation and dismounting are convenient. Embodiment 3

[0023] In the utility model, the core component is a sampling plug, in order to improve the service life of the sampling plug, another structural schematic view is given. The bottom surface and the top surface of the sampling chamber 8 are inward protrusions, the opening of the exhaust hole 10 is arranged in the top surface groove, the outlet is arranged on the outer circumferential surface of the sampling plug, the length of the exhaust hole is shortened, and the exhaust is discharged by using the sleeving gap between the sampling plug and the sampling cylinder. The bottom surface protrusion facilitates the rapid outflow of molten iron, and avoids the solidification of molten iron in the sampling chamber due to cooling; the top surface protrusion is beneficial to the gathering of the gas in the sampling chamber into the groove, and the exhaust is discharged by using the sleeving gap, so that the molten iron enters the support pipe due to the large size of the exhaust hole, and the sampling accident is avoided.

[0024] The utility model collects molten iron from the medium frequency furnace, and prepares molten iron analysis spectrum samples together with copper sample mold. The sampling chamber is sealed in the sampling cylinder, and the adverse effect of slag on the surface of molten iron on sampling is avoided. The sampling cylinder and the sampling plug adopt materials which are not infiltrated with molten iron, and there is no residual iron in the sampling chamber after sampling, so that continuous sampling can be realized. Mechanical action can be combined with automatic control of the prior art, so that automatic operation of sampling is realized.

Claims

1. A medium frequency furnace liquid iron sampler, comprising a pneumatic cylinder, a sampling rod (3), a supporting tube (4), a sampling cylinder (7), a sampling plug (9); characterized in that: The cylinder barrel of the air cylinder is fixedly connected with the upper end of the support pipe (4), and the sampling cylinder (7) is fixedly connected with the lower end of the support pipe (4); the lower end of the cylinder rod of the air cylinder is connected with the sampling rod (3), the lower end of the sampling rod (3) is connected with the sampling plug (9), the sampling plug (9) is sleeved in the sampling cylinder (7); the middle part of the sampling plug (9) is provided with a sampling chamber (8), the sampling chamber (8) is communicated with the outside through the sampling port (12) at the bottom, and the sampling port (12) is uniformly distributed on the outer circumferential surface of the sampling plug (9); the top of the sampling chamber (8) is provided with an exhaust hole (10).

2. The molten iron sampler for medium frequency furnace according to claim 1, characterized in that: The sampling cylinder (7) and the support pipe (4) are connected by fasteners, and the fasteners are wrapped with refractory mortar.

3. A molten iron sampler for an intermediate frequency furnace as claimed in claim 2 wherein: The fasteners are matched with the chisel iron (13) and the polished rod bolt (14), and the polished rod bolt (14) is processed with a through hole matched with the chisel iron (13).

4. The molten iron sampler for medium frequency furnace as claimed in claim 1, wherein: The sampling plug (9) is threadedly connected with the sampling rod (3).

5. The molten iron sampler for medium frequency furnace as claimed in claim 1, wherein: An insulating sheet (6) is arranged between the sampling cylinder (7) and the support pipe (4).

6. The molten iron sampler for medium frequency furnace as claimed in claim 1, wherein: An insulating pad (2) is arranged between the sampling rod (3) and the cylinder rod of the air cylinder.

7. The molten iron sampler for medium frequency furnace as claimed in claim 1, wherein: The bottom surface and the top surface of the sampling chamber (8) are provided with inward protrusions; the opening of the exhaust hole (10) is arranged in the top surface groove, and the outlet is arranged on the outer circumferential surface of the sampling plug (9).

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