A new type of multi-petal shell breaking hammer head for aluminum electrolytic cell

Abstract

The utility model discloses a kind of multi-lobe new shell hammer head for aluminum electrolytic cell, mainly by hammer and hammer head being set in the lower end position of the hammer, the end face of the hammer is concave and formed with inner groove.The hammer head of the utility model can reduce the contact area of hammer head and incrustation, so that the hammer head can generate higher pressure on incrustation under low pressure, and the hammer head can quickly crush incrustation, and the aluminum oxide can effectively enter the electrolyte and be quickly dissolved.Meanwhile, the hammer head of the utility model is provided with inner groove and gap, and the aluminum oxide powder carried by the inner groove and gap is used as a barrier layer when cracking shell, which can effectively reduce the high-temperature electrochemical corrosion and wear of the hammer head caused by electrolyte, even if some electrolyte is adhered, due to the thermal expansion and contraction of the multi-lobe structure, the shell head package will automatically fall off, reducing the frequency of hammer head sticking package.

Description

Technical Field

[0001] This utility model belongs to the field of electrolytic aluminum production technology, specifically referring to a new type of multi-lobed shell-breaking hammer for aluminum electrolytic cells. Background Technology

[0002] Currently, in the electrolytic aluminum production process, the temperature drops after the alumina or aluminum fluoride is fed into the electrolytic cell, causing the liquid electrolyte surface at the feeding nozzle to solidify and form a shell within a short time. When the next alumina or aluminum fluoride is fed, the powder may not be able to reach the molten liquid electrolyte pool, thus preventing the electrolytic cell from performing normal electrolytic aluminum production, affecting the cell's output, and causing an anode effect, resulting in low output and high power consumption. To overcome these problems, a hole needs to be opened on the shell surface using the electrolytic cell's shell-breaking device before the next alumina or aluminum fluoride feeding to allow for smooth feeding of the alumina or aluminum fluoride. Existing shell-breaking devices, both domestic and international, come in cylindrical and frustum-conical shapes, and are made of ordinary carbon steel and wear-resistant alloy steel, but all have the following problems:

[0003] (1) During long-term shell-breaking operations, the shell-breaking hammerhead is easily worn down by electrolytes and chemically corroded, eventually leading to a gradual reduction in the size of the hammerhead tip until it becomes unusable. This shortens the lifespan of the hammerhead; generally, hammerheads made of carbon steel need to be replaced every 4-6 months, and hammerheads made of wear-resistant alloy steel need to be replaced every 6-8 months, thus increasing production costs and replacement workload. (2) Existing shell-breaking devices use a cylinder striking method, with a factory-set pressure of approximately 6 kgf / cm². 2 When operating under air pressure, the hammer head will normally penetrate the shell and enter the molten electrolyte pool. The head of the hammer will be covered with electrolyte solution. After a period of time, a large shell bulge will grow on the head of the hammer. The shell bulge needs to be manually removed by striking it every shift, which is quite labor-intensive for the operators.

[0004] In summary, the shell-breaking hammers of existing electrolytic cell shell-breaking devices cannot adequately meet actual usage requirements and need further optimization and improvement. Utility Model Content

[0005] The purpose of this invention is to solve the above problems and provide a novel multi-lobed shell-breaking hammer for aluminum electrolysis cells.

[0006] The purpose of this utility model is achieved through the following technical solution: a new type of multi-lobed shell-breaking hammer head for aluminum electrolysis cells, mainly composed of a hammer rod and a hammer head set at the lower end of the hammer rod, wherein the end face of the hammer head is concave to form an inner groove.

[0007] To achieve better performance, this invention provides three or more slits on the hammer head, dividing it into a multi-lobed structure.

[0008] Furthermore, the width of each slit is 3 to 10 mm, and its length is more than 240 mm.

[0009] The hammer rod is a steel pipe, and the hammer head is a solid body.

[0010] To ensure practical effectiveness, the hammerhead is made of wear-resistant and corrosion-resistant alloy steel, or it is made of 1Cr18Ni9Ti antimagnetic, corrosion-resistant, and heat-resistant stainless steel.

[0011] As a preferred embodiment, the depth of the inner groove is at least 20 mm, and the width of the groove edge is 10 to 15 mm.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0013] (1) The hammer head of this utility model has a multi-lobed structure, which can reduce the contact area between the hammer head and the shell, so that the hammer head can generate higher pressure on the shell under low pressure. The hammer head can quickly break the shell, and the aluminum oxide can effectively enter the electrolyte and dissolve quickly.

[0014] (2) The hammer head of this utility model is provided with an inner groove and a gap. When the shell is being broken, the alumina powder in the inner groove and the gap is used as an isolation layer, which can effectively reduce the high temperature electrochemical corrosion and wear of the electrolyte on the hammer head. Even if some electrolyte sticks to it, the shell will automatically fall off due to the thermal expansion and contraction of the multi-lobed structure, reducing the frequency of the hammer head sticking to the shell.

[0015] (3) When using the hammer head of this utility model, it is only necessary to penetrate to a depth of 20-120 mm below the electrolyte liquid surface during actual use. When the shell is being broken, the alumina powder embedded in the inner groove can be pressed into the electrolyte melt better, and the molten electrolyte can dissolve the alumina better during the downward movement of the hammer head. At the same time, the electrolyte surface that has not yet formed a hard shell is crushed, so that it sinks and dissolves quickly as it sinks into the liquid electrolyte.

[0016] (4) The hammer head of this utility model can greatly reduce the high-temperature electrochemical corrosion and wear of the hammer head caused by the electrolyte, and can greatly improve the service life of the hammer head, which can reach more than 2 years. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 for Figure 1 A schematic diagram of the bottom-view end structure.

[0019] Figure 3This is a schematic diagram of the installation structure of this utility model.

[0020] The reference numerals in the above figures are: 1-hammer rod, 2-hammer head, 3-inner groove, 4-gap, 5-cylindrical pin. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0022] Example

[0023] like Figure 1 , 2 As shown in this embodiment, the multi-lobed novel shell-beating hammer head for aluminum electrolysis cells comprises two parts: a hammer rod 1 and a hammer head 2 located at the lower end of the hammer rod 1. The hammer rod 1 and hammer head 2 can be two independent components or integrally formed. In this embodiment, the hammer rod 1 and hammer head 2 are preferably set as two independent components. To facilitate connection between the hammer rod 1 and an external striking cylinder, the hammer rod 1 is preferably made of ordinary carbon steel tubing in this embodiment. The hammer head 2 needs to be made into a solid body, constructed from wear-resistant and corrosion-resistant alloy steel. When the hammer rod 1 and hammer head 2 are fixedly connected, the outer diameter of the upper end of the hammer head 2 is slightly smaller than the inner diameter of the hammer rod 1 to ensure that the upper end of the hammer head 2 can be completely embedded inside the hammer rod 1, and is fixed by a cylindrical pin 5, thereby making the hammer rod 1 and hammer head 2 form a single unit.

[0024] To ensure the actual performance of the hammer head 2, a recessed groove 3 needs to be formed on the lower end face of the hammer head 2. This recessed groove 3 can be formed by machining, casting, or stamping, depending on the requirements. To ensure the performance, the depth of the recessed groove 3 should be at least 20mm, and its groove edge width should be 10-15mm.

[0025] The hammerhead 2 has three or more slits 4, which divide the entire hammerhead 2 into a multi-lobed structure. Figure 2 The diagram shows a structure with four slits 4 on the hammer head 2, in which case the entire hammer head 2 is divided into four segments. These slits 4 are preferably manufactured by machining. When setting these slits 4, they should be evenly spaced around the center point of the end face of the hammer head 2, along the circumference of the end face. The width of each slit is 3–10 mm, and its length is at least 240 mm.

[0026] With the above-described structure, the inner groove 3 on the end face of the hammer head 2 effectively reduces the contact area between the hammer head 2 and the crust, allowing the hammer head 2 to generate high pressure on the crust even under normal or slightly low pressure conditions, thus enabling the hammer head 2 to quickly break up the crust. Actual testing in this embodiment shows that only a pressure of 2 kgf / cm² is needed on the hammer head 2. 2 With compressed air pressure of about 260mm, a shell-breaking stroke of about 260mm, and a shell-breaking frequency of about 1 to 2 minutes, shell breaking can be achieved, which is far more efficient than the shell-breaking efficiency of traditional hammers.

[0027] Depending on the requirements, the hammerhead 2 in this embodiment can also be made of 1Cr18Ni9Ti antimagnetic, corrosion-resistant, and heat-resistant stainless steel. This material is wear-resistant, corrosion-resistant, high-temperature resistant, and reasonably priced, ensuring the wear-resistant, corrosion-resistant, and high-temperature resistant properties of the entire hammerhead 2, effectively improving the service life of the hammerhead and effectively reducing the production cost of electrolytic aluminum.

[0028] The structure of the hammer head 2 connected to the external striking cylinder via the hammer rod 1 in this embodiment is as follows: Figure 3 As shown. During operation, the striking cylinder drives the hammer rod 1, thereby causing the hammer head 2 to move synchronously with the hammer rod 1. When the hammer head 2 is pressed down, the alumina powder in the inner groove 3 of the hammer head 2 can be effectively pressed into the electrolyte melt; during the lifting of the hammer head 2, the molten electrolyte will carry the alumina in the inner groove 3 into the electrolyte. In this way, not only is the hammering stroke and time significantly shortened, but the surface of the electrolyte that has not formed a hard shell can also be crushed, causing it to sink into the liquid electrolyte, achieving the function of sinking and dissolving rapidly at the same time. This greatly reduces the wear of the hammer head 2, improves the service life of the entire hammer head 2, and solves the problem of hammer head sticking to the shell that has existed in the industry for a long time.

[0029] As described above, this utility model can be realized to a high degree.

Claims

1. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells, characterized in that, It is mainly composed of a hammer rod (1) and a hammer head (2) located at the lower end of the hammer rod (1). The end face of the hammer head (2) is concave to form an inner groove (3). There are three or more gaps (4) on the hammer head (2) and the hammer head (2) is divided into a multi-lobed structure.

2. The novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 1, characterized in that, Each slit is 3 to 10 mm wide and more than 240 mm long.

3. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 1 or 2, characterized in that, The hammerhead (2) is a solid body.

4. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 3, characterized in that, The hammer rod (1) is a steel pipe.

5. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 3, characterized in that, The hammerhead (2) is made of wear-resistant and corrosion-resistant alloy steel.

6. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 3, characterized in that, The hammerhead (2) is made of 1Cr18Ni9Ti antimagnetic, corrosion-resistant and heat-resistant stainless steel.

7. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 3, characterized in that, The depth of the groove (3) is at least 20 mm.

8. A novel multi-lobed shell-breaking hammerhead for aluminum electrolysis cells according to claim 7, characterized in that, The groove width of the inner groove (3) is 10-15mm.

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