A device for cleaning the interior of a cylindrical tank

Abstract

This utility model discloses a device for cleaning the interior of a cylindrical tank, including a winch and a base. The winch's drum is wound with a steel wire rope, and the winch is installed on the base, which is located outside the manhole at the top of the tank. It also includes a ring disc, suspended by the steel wire rope. The ring disc comprises at least two fan-shaped ring plates, each fan-shaped, and the at least two fan-shaped ring plates are connected end-to-end to form a ring disc. The ring disc is assembled from at least two fan-shaped ring plates. The fan-shaped ring plates are inserted into the tank through the manhole, and inside the tank, they are assembled into an annular disc that fits the inner diameter of the tank. Workers can then move left and right on the ring disc and use tools to clean scale buildup on the tank wall. The annular hole in the center of the ring disc allows scale to fall off and be discharged through the manhole at the bottom of the tank. A winch is installed at the manhole at the top of the tank and connected to the ring disc by a rope. The height of the working surface can be adjusted by adjusting the winding and unwinding of the winch's rope.

Description

Technical Field

[0001] This utility model relates to the field of insulated tank technology, and in particular to a device for cleaning the inside of a cylindrical tank. Background Technology

[0002] In the Bayer process for alumina production, holding tanks are used to maintain the temperature of the heated ore slurry, thereby extending the leaching time. Eight holding tanks are deployed in series, with top feeding and bottom discharging, based on production targets. During the holding period of the leached ore slurry, due to the reverse dissolution properties of sodium aluminate solution, a large amount of solid material inevitably precipitates and adheres to the entire tank wall, forming scale. This scale can detach and block the inlet and outlet ports, potentially triggering the overpressure safety valve of the leaching unit. Therefore, cleaning the scale from the holding tanks is an important task each time the leaching unit is taken out of service for maintenance.

[0003] The currently used insulated residence tank is a cylindrical shape with a diameter of Φ4200×15500mm. When the unit is taken out for maintenance, the scale located high on the inner wall is not easy to clean, which is a high-altitude operation and poses certain risks.

[0004] Generally, a lowered cage is used to carry operators to clean the high-level scale on the inner wall of the insulated tank. The insulated storage tank is cylindrical, unlike large-diameter cylindrical tanks such as settling tanks and dilution tanks. The diameter of the insulated storage tank is generally no more than 5 meters, with a large internal curvature and relatively small space. The cage itself is large, and using a conventional square or rectangular cage would be limited by the confined space inside the insulated storage tank. When using a lowered cage to enter the tank, it is easy to touch the tank walls and scale. Furthermore, the distance from the inner wall to the central manhole is 1-2 meters, requiring the cage to move around the manhole to cover the inner walls. Moving or turning the cage inside the tank is difficult, making efficient operation challenging. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned problems by providing a device for cleaning the inside of a cylindrical tank. The device uses an annular disc adapted to the inner diameter of the tank, allowing workers to move left and right on the disc for cleaning operations.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An apparatus for cleaning the interior of a cylindrical tank includes a winch and a base. The winch drum is wound with a steel wire rope. The winch is installed on the base, which is installed on the outside of the manhole at the top of the tank. The apparatus also includes a ring disc, on which the steel wire rope suspends the ring disc. The ring disc includes at least two fan-shaped ring plates, which are arranged in a fan-shaped structure. The at least two fan-shaped ring plates are connected end to end in sequence to form a ring disc.

[0007] As described above, a base is installed on the top wall of the tank, and a winch is mounted on the base. The winch's wire rope is inserted through the manhole at the top of the tank to hoist the ring disc. The ring disc is assembled from at least two fan-shaped ring plates. The fan-shaped ring plates are sent into the interior of the insulated tank through the manhole. Inside the tank, the fan-shaped ring plates are spliced ​​together to form an annular disc that fits the inner diameter of the tank. Workers can then move left and right on the ring disc and use tools to clean the scale on the tank wall. The annular hole in the center of the ring disc allows the scale to fall off and be discharged through the manhole at the bottom of the tank. A winch is installed at the manhole at the top of the tank and connected to the ring disc by a rope. The height of the working surface can be adjusted by adjusting the winding and unwinding of the winch's rope.

[0008] Based on the above solution, in an improved solution, in order to improve the protection of workers, the device for cleaning the inside of the cylindrical tank also includes an inner fence, which includes several inner guardrail sections arranged along the inner edge of the ring plate to provide protection.

[0009] Based on the above solution, in an improved solution, in order to improve the protection of workers, the cleaning device inside the cylindrical tank also includes an outer fence, which consists of several outer guardrail sections arranged along the outer edge of the ring plate to provide protection.

[0010] Based on the above solution, in an improved solution, in order to improve the load-bearing capacity of the ring plate, the internal cleaning device of the cylindrical tank also includes a corner bracket. The corner bracket is used in pairs with the fan ring plate. The corner bracket is installed at the middle of the bottom wall of the fan ring plate. The front corner of the corner bracket extends forward and protrudes from the inner edge of the fan ring plate, and the rear corner of the corner bracket extends backward and protrudes from the inner edge of the fan ring plate. The front and rear corners of two adjacent corner brackets are connected end to end, which strengthens the connection and load-bearing function.

[0011] Based on the above solution, in an improved version, to enhance the connection stability of the winch, the cleaning device for the interior of the cylindrical tank includes a base comprising a left clamp, a right clamp, a support base, a crossbeam, and a fixed pulley. The left and right clamps are detachably clamped and installed around the outer periphery of the top manhole of the tank. The crossbeam is installed on the left clamp and spans across the top manhole of the tank. The fixed pulley is installed in the middle of the crossbeam. A support base extends from the outer side of the right clamp, and a winch is installed on the support base. The winch's wire rope passes through the fixed pulley and extends downward into the top manhole of the tank. The inner walls of the left and right clamps are clamped to the outer periphery of the top manhole of the tank, and the bottom walls of the left and right clamps are placed on the top wall of the tank. The bottom wall of the support base is also placed on the top wall of the tank. This base, with its tubular clamp structure, is detachably clamped to the outer periphery of the top manhole for quick assembly and disassembly. Furthermore, the winch is fixed via the base, improving the connection stability of the winch.

[0012] By adopting the above technical solution, this utility model has the following beneficial effects: This utility model discloses a device for cleaning the interior of a cylindrical tank. A ring disc is hoisted onto the top wall of the tank using a winch. The ring disc is formed by assembling at least two fan-shaped ring plates. The fan-shaped ring plates are sent into the interior of the insulated tank through a manhole. Inside the tank, the fan-shaped ring plates are spliced ​​together to form an annular disc that fits the inner diameter of the tank. Then, the operator can move left and right on the ring disc and use tools to clean the scale on the tank wall. The annular hole in the middle of the ring disc allows the scale to fall off and be discharged from the manhole at the bottom of the tank. Furthermore, a winch is installed at the manhole at the top of the tank and connected to the ring disc by a rope. The height of the working surface can be adjusted by adjusting the winding and unwinding of the winch rope. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Example 1 of the device for cleaning the inside of the tank according to this utility model. Figure 2 yes Figure 1 A schematic diagram of the base structure. Figure 3 yes Figure 2 Another perspective structural diagram. Figure 4 yes Figure 1 Top view of the circular disk. Figure 5 yes Figure 1 A schematic diagram of the fan-shaped ring plate and fence structure. Figure 6 yes Figure 5 Another perspective structural diagram. Figure 7 yes Figure 5 Another perspective structural diagram.

[0014] Figure 8 This is a bottom view of the annular disc of Example 2 of the device for cleaning the inside of the tank according to this utility model.

[0015] In the attached diagram, 1 is the ring disc, 2 is the winch, and 3 is the base. Detailed Implementation Example

[0016] See Figures 1-8 As described above, the device for cleaning the interior of a cylindrical tank according to this application includes a basic scheme and an improved scheme. For example, an improved scheme includes an inner fence, an improved scheme includes a corner bracket, and an improved scheme uses a tubular clamp structure for the base, etc. The following will describe a preferred example with all the features combined.

[0017] See Figures 1-7 This embodiment of a device for cleaning the interior of a cylindrical tank includes a winch 2 and a base 3. The winch 2 has a steel wire rope 22 wound on its drum. The winch 2 is installed on the base 3, which is installed on the outside of the top manhole 101 of the tank 100. It also includes a ring disc 1, on which the steel wire rope 22 suspends the ring disc 1. The ring disc 1 includes at least two fan-shaped ring plates 11. The fan-shaped ring plates 11 have a fan-shaped structure, and at least two fan-shaped ring plates 11 are connected end to end in sequence to form a ring disc.

[0018] The internal cleaning device for the cylindrical tank also includes an inner fence, which consists of several inner guardrail sections 12'. These sections are arranged along the inner edge of the ring plate to provide protection. The inner guardrail sections can be paired with the fan ring plates and installed facing each other, or the inner guardrail sections can be installed at the connection point of two adjacent fan ring plates to improve connection stability. The inner guardrail sections are fixed by bolts to the inner guardrail holes 121', the inner edge 13', and the inner edge holes 131'.

[0019] The internal cleaning device for the cylindrical tank also includes an outer fence, which consists of several outer guardrail sections arranged along the outer edge of the ring plate to provide protection. The outer guardrail sections can be used in pairs with the fan ring plates and installed facing each other, or the outer guardrail sections can be installed at the connection point of two adjacent fan ring plates to improve the connection stability. The outer guardrail sections are fixed by bolts and bolts to the outer guardrail hole 121, the outer edge 13, and the outer edge hole 131.

[0020] The internal cleaning device for the cylindrical tank also includes a corner bracket 24, which is used in conjunction with the fan-shaped ring plate 11. The corner bracket 24 is installed at the middle of the bottom wall of the fan-shaped ring plate 11. The front corner of the corner bracket 24 extends forward and protrudes from the inner edge of the fan-shaped ring plate, and the rear corner of the corner bracket 24 extends backward and protrudes from the inner edge of the fan-shaped ring plate. The front and rear corners of two adjacent corner brackets are connected end to end, and corner joint holes 241 are provided for bolt and nut bolt connection and fixation, which strengthens the connection and provides load-bearing function. Figure 4 Example 1 shows a right-angled bracket welded to the bottom of the fan ring plate. Hanging holes can be configured on it for binding with ropes 23 or for suspension with hanging rings. For example... Figure 8 Example 2 is given, where the corner frame '24' has a cross-shaped structure.

[0021] The device for cleaning the interior of the cylindrical tank includes a base 3 comprising a left clamp, a right clamp, a support base, a crossbeam, and a fixed pulley. The left and right clamps can have the same or different structures as the pipe clamps. As shown in the figure, the left and right clamps have the same structure, both being half-clamps 31. The left and right clamps are detachably clamped and installed around the manhole at the top of the tank. The crossbeam 34 is installed on the left clamp and spans the manhole at the top of the tank. The fixed pulley 35 is installed in the middle of the crossbeam 34. A support base 32 extends from the outside of the right clamp. A winch 21 is installed on the support base 32. The wire rope 22 of the winch 21 passes through the fixed pulley 35 and extends downward into the manhole at the top of the tank. The inner walls of the left and right clamps are fastened to the outer periphery of the manhole at the top of the tank. The bottom walls of the left and right clamps are placed on the top wall of the tank, and the bottom wall of the support base is also placed on the top wall of the tank. A positioning nut 36 is used on the crossbeam for limiting and fixing to ensure stable installation and secure fixation of the pulley. This base, with its tubular clamp structure, can be detachably clamped to the outer periphery of the top manhole for quick assembly and disassembly. Furthermore, the winch is connected and fixed via the base, improving the stability of the winch connection.

[0022] As mentioned above, a ring disc is hoisted onto the top wall of the tank using a winch. The ring disc is formed by assembling at least two fan-shaped ring plates. The fan-shaped ring plates are sent into the interior of the insulated tank through the manhole. Inside the tank, the fan-shaped ring plates are spliced ​​together to form an annular disc that fits the inner diameter of the tank. Then, workers can move left and right on the ring disc and use tools to clean the scale on the tank wall. The annular hole in the middle of the ring disc is used for the scale to fall off and be discharged from the manhole at the bottom of the tank. Furthermore, a winch is installed at the manhole at the top of the tank and connected to the ring disc by ropes. The height of the working surface can be adjusted by adjusting the winding and unwinding of the winch ropes.

[0023] See Figures 1-8 Each arc-shaped component fan ring plate has a connecting surface and a reinforcing surface. Its inner and outer edges are connected and fixed using connecting arc plates 14 with bolts, arc holes 141, and outer edge holes 131. (See also...) Figure 4 Personnel move freely within the circular disc surface, providing flexible working space. (See also...) Figure 1 The annular disc is placed inside the insulated storage tank and can be moved up and down flexibly using a lifting device.

[0024] As described above, an annular disc device (ring disc) is used, perfectly suited to the characteristics of the insulated holding tank, which has a large curvature and limited space. The necessary components (fan-shaped ring plates) for the annular disc device are fed into the insulated tank through a manhole, and the components are assembled into an annular disc inside the tank. Workers move on the disc surface, using tools to clean scale buildup on the tank walls. The scale cleaned through the central hole of the annular disc falls to the bottom of the tank and is discharged through the manhole at the bottom of the insulated tank. A winch is installed at the manhole at the top of the insulated holding tank, connected to the working disc by a reinforcing rope (steel wire rope). The height of the working surface is adjusted by regulating the raising and lowering of the winch's rope.

[0025] For the personnel working area: 3-4 arc-shaped pedals (fan-shaped plates) are assembled into a ring-shaped disc inside the tank using fasteners (connecting arc plates), reinforcements (angle brackets), etc. Guardrails are installed to ensure the safety of the workers. The winch is connected by a reinforcing rope.

[0026] Winch hoist: The winch is connected to the disc via four steel wire ropes. The motor winds up and down the steel ropes to achieve the lifting effect of the disc.

[0027] As mentioned above, using a lifting platform with a rotating disc is suitable for most cylindrical high-altitude work scenarios. The diameter of the disc can be flexibly adjusted according to the needs of the work scenario. The wider disc surface allows multiple people to work simultaneously, accelerating the work progress, while traditional square cages can only accommodate 2-3 people at a time. The working height can be easily and quickly adjusted using a winch, and the use of the disc significantly saves space, far superior to the cumbersome and space-consuming problems of traditional scaffolding. The disc is assembled from 3-4 curved plates (fan-shaped ring plates), which can be quickly disassembled after use for easy transportation and storage. Furthermore, its simple mechanical structure facilitates easier inspection and maintenance.

[0028] It should be noted that the examples of the above embodiments can preferably be combined with one or more of each other according to actual needs, and the accompanying drawings of multiple examples adopt a set of combined technical features, which will not be described in detail here.

[0029] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0030] The above description is a detailed explanation and illustration of the preferred embodiments of the present utility model. However, these descriptions are not intended to limit the scope of protection claimed by the present utility model. All equivalent changes or modifications made under the technical teachings of the present utility model shall fall within the patent protection scope covered by the present utility model.

Claims

1. A device for cleaning the interior of a cylindrical tank, comprising a winch and a base, wherein a steel wire rope is wound on the drum of the winch, the winch is mounted on the base, and the base is mounted on the outside of the manhole at the top of the tank; characterized in that: It also includes a ring disc, on which the wire rope is suspended. The ring disc includes at least two fan-shaped ring plates, which are arranged in a fan-shaped structure. The at least two fan-shaped ring plates are connected end to end in sequence to form a ring disc.

2. The apparatus for cleaning the interior of a cylindrical tank according to claim 1, characterized in that: It also includes an inner fence, which consists of several inner guardrail sections arranged along the inner edge of the ring.

3. The apparatus for cleaning the interior of a cylindrical tank according to claim 1, characterized in that: It also includes an outer fence, which consists of several outer guardrail sections arranged along the outer edge of the ring.

4. The apparatus for cleaning the interior of a cylindrical tank according to claim 1, characterized in that: It also includes corner brackets, which are used in pairs with the fan ring plate. The corner brackets are installed in the middle of the bottom wall of the fan ring plate. The front corner of the corner bracket extends forward and protrudes from the inner edge of the fan ring plate, and the rear corner of the corner bracket extends backward and protrudes from the inner edge of the fan ring plate. The front and rear corners of two adjacent corner brackets are connected end to end.

5. The apparatus for cleaning the interior of a cylindrical tank according to claim 1, characterized in that: The base includes a left clamp, a right clamp, a support base, a crossbeam, and a fixed pulley. The left and right clamps are detachably clamped and installed around the outer periphery of the top manhole of the tank. The crossbeam is installed on the left clamp and spans across the top manhole of the tank. The fixed pulley is installed in the middle of the crossbeam. The support base extends outward from the right clamp and a winch is installed on the support base. The wire rope of the winch passes through the fixed pulley and extends downward into the top manhole of the tank.

6. The apparatus for cleaning the interior of a cylindrical tank according to claim 5, characterized in that: The inner walls of the left and right clamps are clamped to the outer peripheral wall of the top manhole of the tank, and the bottom walls of the left and right clamps are placed on the top wall of the tank, and the bottom wall of the support is placed on the top wall of the tank.

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