Polishing machine for outer circumferential surface of tank body

Abstract

The utility model discloses a tank outer circumferential surface polishing machine which comprises a roller device and a polishing device, the roller device drives a tank to rotate, and the polishing device polishes the outer circumferential surface of the tank. The belt type polishing machine is arranged on the connecting rod frame which is installed on the trolley. The lower end of the rocker is rotationally connected with a driving shaft of the belt type polishing machine, and the upper end of the rocker is rotationally connected with a fixing shaft in the middle of the rotating rod. The connecting shaft is rotationally connected with one end of the basket telescopic piece I and one end of the basket telescopic piece II, the other end of the basket telescopic piece I is rotationally connected with the end shaft I, and the end shaft I and the driving shaft are both fixed to the trolley. The upper end of the rotating rod is rotationally connected with a driven shaft of the belt type polishing machine; and polishing belts are mounted on the driving shaft and the driven shaft. The polishing device is suitable for polishing the outer circumferential surfaces of large-diameter tank bodies or pipe workpieces, and is high in polishing efficiency, free of special structures and low in manufacturing cost.

Description

Technical Field

[0001] This utility model is applied in the chemical industry and relates to the storage of cryogenic liquefied gases. Specifically, it is a double-layered storage tank with an outer tank enclosing an inner tank for storing cryogenic gases. Background Technology

[0002] Cryogenic storage tanks typically have a double-layer structure, with an outer tank made of low-alloy steel and an inner tank made of stainless steel. The space between the two tanks is filled with insulating material, and a vacuum is applied to enhance insulation performance. To prevent the inner tank from affecting the stored medium or the vacuum level, both the inner and outer surfaces of the stainless steel inner tank need to be polished to remove oil and other contaminants. Currently, inner tank polishing is mostly done manually. The tank is placed on a roller device and slowly rotated, while the inner and outer surfaces are polished manually using a polishing machine. This method is not only labor-intensive but also extremely inefficient and cannot guarantee polishing quality. Mechanized polishing is therefore essential.

[0003] There are numerous patent applications for devices for polishing the outer circumferential surface of tubular and shaft-like workpieces. For example, CN105108614B discloses a device for polishing the outer surface of bent pipes. The machine tool is equipped with a grinding mechanism and a reverse rotation mechanism connected to a controller. The driving mechanism of the grinding mechanism drives the polishing belt, and the driving mechanism of the reverse rotation mechanism drives a rotating disk. The polishing belt cooperates with the rotating disk to achieve automated polishing of the outer surface of bent and straight pipes. CN108202285B discloses a high-precision device for finishing the outer circumferential surface of cylindrical workpieces. By loosening the locking bolts and adjusting the positions of the adjusting bolts and the intermediate adjusting disk, the finishing polishing belt is made to fit tightly against the workpiece surface. During the adjustment process, the sliding sleeve slides up and down in the slide block to center the workpiece. Tightening the locking bolts drives the motor of the polishing belt, and simultaneously the workpiece rotates for finishing. This invention can adapt to the centering and finishing processing of workpieces of different diameters. Other examples include CN108838828A, a polishing device for ring-shaped parts; CN119175630A, a polishing device for processing stainless steel pipe fittings; CN213438885U, a polishing device for the outer diameter of shafts; and CN222449821U, a polishing device for the outer surface of steel pipes. These polishing devices are suitable for pipe and shaft workpieces with smaller diameters, but there are no suitable polishing machines for tanks with larger diameters. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a polishing machine for the outer circumferential surface of a tank, which is suitable for polishing the outer circumferential surface of large-diameter tanks or pipe-like workpieces. As an auxiliary tooling for production, it has a simple structure and low investment.

[0005] The technical solution adopted by this utility model is as follows: The outer circumferential surface polishing machine of this utility model includes a roller device and a polishing device. The polishing device includes a trolley, a connecting rod frame, and a belt polishing machine; the belt polishing machine is mounted on the connecting rod frame, and the connecting rod frame is mounted on the trolley. The connecting rod frame includes a basket telescopic component I, a rocker arm, a basket telescopic component II, and a rotating rod, etc. A fixed shaft is provided in the middle of the rotating rod, and a connecting shaft is fixed in the middle of the rocker arm. The lower end of the rocker arm is rotatably connected to the drive shaft of the belt polishing machine, and the upper end of the rocker arm is rotatably connected to the fixed shaft. The connecting shaft is rotatably connected to one end of the basket telescopic component I and the basket telescopic component II, and the other end of the basket telescopic component I is rotatably connected to the end shaft I. Both the end shaft I and the drive shaft are fixed on the trolley. The other end of the basket telescopic component II is rotatably connected to the end shaft II, and the end shaft II is fixed to the lower end of the rotating rod. The upper end of the rotating rod is rotatably connected to the driven shaft of the belt polishing machine; a polishing belt is installed on the drive shaft and the driven shaft.

[0006] Furthermore, the polishing device is located on both sides of the tank, and the two polishing belts generate rotational torques on the tank in opposite directions, which helps to reduce the adverse effects of polishing friction on the rotation of the tank.

[0007] Furthermore, the roller device includes two driven wheels and a driving device, wherein the shafts of the two driving wheels of the driving device are connected to a long shaft via a coupling; the driving wheels support the outer circumferential surface of the tank.

[0008] Furthermore, the roller device includes four driven rollers and a drive unit. The drive unit includes a drive wheel, a reducer, a tank-rotating motor, a rotating frame, a rotating shaft, and a pry bar. The drive wheel is located inside the tank and mates with the inner surface of the tank. The drive wheel, reducer, and tank-rotating motor are fixedly mounted on the rotating frame, which rotates around the rotating shaft. The rotating shaft is fixed to the ground, and one end of the rotating shaft is a square post, which is fitted onto the pry bar.

[0009] Furthermore, the circumference of the center of the driving wheel rotating around the rotation axis passes through the center of the driven roller that it cooperates with.

[0010] Furthermore, a counterweight is added to the rotating frame, or a pad is inserted between the pry bar and the ground to increase the rotational friction of the tank.

[0011] Furthermore, a driving gear is mounted on the shaft of the driving wheel, while a driven gear is mounted on the shaft of the mating roller. The transmission ratio of the driving gear and the driven gear ensures that the rotational angular velocity of the tank is the same. In this way, while the driving wheel provides rotational friction for the tank, the mating roller also provides rotational friction, which helps to improve polishing friction and polishing efficiency.

[0012] Furthermore, the flower basket telescopic component I and flower basket telescopic component II have the same structure, including a central rotating frame and threaded rods at both ends, with the thread directions of the two end rods being opposite. Flower basket telescopic component I and flower basket telescopic component II can be replaced by hydraulic cylinders or pneumatic cylinders.

[0013] The beneficial effects of this invention are: it is suitable for polishing the outer circumferential surface of large-diameter tanks or tubular workpieces, improving polishing efficiency by comparing the rotational friction of the tank with the polishing friction. This invention has no special structure and low manufacturing cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of Example 1;

[0015] Figure 2 for Figure 1 A diagram showing the view from the right.

[0016] Figure 3 This is a schematic diagram of the roller device structure in Example 2;

[0017] Figure 4 for Figure 3 A diagram showing the view from the right.

[0018] Figure 5 This is a schematic diagram of the main structure of Example 3;

[0019] Reference numerals: 1-Roller assembly, 2-Trolley, 3-Linkage frame, 4-Belt polisher, 5-Tank body;

[0020] 11-Rotating tank motor, 12-Reducer, 13-Drive wheel, 14-Coupling, 15-Long shaft, 16-Rotating frame, 17-Rotating shaft, 18-Pry bar, 19-Padded block, 20-Drive gear, 21-Driven gear;

[0021] 31-Flower basket telescopic component I, 32-Rock bar, 33-Flower basket telescopic component II, 34-Rotating rod, 35-Fixed shaft, 36-Connecting shaft, 37-End shaft I, 38-End shaft II;

[0022] 41-Polishing motor, 42-Drive shaft, 43-Polishing belt, 44-Driven shaft. Detailed Implementation

[0023] The trolley's drive system is based on existing technology. It can be driven by a motor and chain mechanism to drive the axle, or by a winch to pull the trolley, etc., which are not shown in the attached diagram. Example

[0024] The structure of the external circumferential surface polishing machine in this embodiment is shown in the attached figure. Figure 1 and attached Figure 2As shown, it includes a roller device 1 and a polishing device. The polishing device includes a trolley 2, a connecting rod frame 3, and a belt polisher 4. The belt polisher 4 is mounted on the connecting rod frame 3, and the connecting rod frame 3 is mounted on the trolley 2.

[0025] The belt polishing machine 4 includes a polishing motor 41, a drive shaft 42, a polishing belt 43, and a driven shaft 44. The output shaft of the polishing motor 41 is connected to the drive shaft 42, driving the drive shaft to rotate. The drive shaft 42 is mounted on the trolley 2. The driven shaft 44 is mounted on the upper end of the rotating rod 34 of the connecting rod frame. The polishing belt 43 is installed between the drive shaft 42 and the driven shaft 44. When the polishing motor 41 is started, the drive shaft 42 drives the polishing belt 43 and the driven shaft 44 to rotate, which can achieve polishing of the outer circumferential surface of the tank.

[0026] The linkage 3 includes a basket telescopic component I 31, a rocker arm 32, a basket telescopic component II 33, and a rotating rod 34. The rocker arm 32, basket telescopic component II 33, and rotating rod 34 are located on both sides of the basket telescopic component I 31, one set on each side, and connected as a single unit via a fixed shaft 35 and a connecting shaft 36. The structure of the basket telescopic component is similar to a basket screw used for stretching and fixing a steel wire rope. The central rotating frame is threadedly connected to the screws at both ends, with the threads of the screws at both ends in opposite directions. Rotating the central rotating frame causes the screws at both ends to stretch or contract simultaneously. The lower end of the rocker arm 32 is rotatably connected to the drive shaft 42 of the belt polisher 4, and the upper end is rotatably connected to the fixed shaft 35 in the middle of the rotating rod 34. A connecting shaft 36 is fixed in the middle of the rocker arm 32. The connecting shaft 36 rotatably connects one end of the basket telescopic component I 31 and the basket telescopic component II 33. The other end of the basket telescopic component I 31 is rotatably connected to the end shaft I 37 fixed on the trolley. The other end of the basket telescopic component II 33 is rotatably connected to the end shaft II 38, which is fixed to the lower end of the rotating rod 34. The basket telescopic component I 31 is used to fix the connecting rod frame 3, and the basket telescopic component II 33 is used to adjust the tension of the polishing belt 43. The basket telescopic component I 31, the rocker arm 32, the trolley 2, the end shaft I 37, the connecting shaft 36, and the drive shaft 42 form a triangular structure to stably support the connecting rod frame 3. When the middle rotating frame of the basket telescopic component I 31 rotates and the screws at both ends extend or retract, the rocker arm 32 can swing back and forth around the drive shaft 42. The flower basket telescopic component II 33, rocker arm 32, rotating rod 34, connecting shaft 36, fixed shaft 35, and end shaft II 38 form a triangular structure to stabilize the rotating rod 34, thereby stabilizing the driven shaft 44 of the belt polisher 4 and ensuring the stable operation of the polishing belt.

[0027] The roller assembly 1 includes two driven rollers and a drive unit. The drive unit includes two driving rollers 13, a tank-rotating motor 11, a reducer 12, a coupling 14, and a long shaft 15. The output shaft of the tank-rotating motor 11 is connected to the reducer 12, and the output shaft of the reducer 12 is connected to the shaft of the driving rollers 13. The shafts of the two driving rollers 13 are connected by the coupling 14 and the long shaft 15. When the tank-rotating motor 11 starts, it drives the driving rollers 13 to rotate through the reducer 12. Under the action of friction, the driving rollers drive the tank to rotate.

[0028] In a typical roller device, there is one driving wheel and three driven wheels. The friction between the driving wheel and the tank body drives the tank to rotate. However, in this invention, there is also friction between the polishing belt and the outer circumferential surface of the tank. That is, there are two frictional forces: one is the friction driving the tank to rotate (the friction between the driving wheel and the outer circumferential surface of the tank), and the other is the friction for polishing the outer circumferential surface (the friction between the polishing belt and the outer circumferential surface of the tank). Regardless of whether these two frictional forces are opposite or the same, if the friction of the polishing belt is greater than or equal to the friction driving the tank to rotate, the tank will stop rotating, or it will rotate under the influence of the polishing belt, and the polishing belt will not perform its polishing function. If the friction of the polishing belt is less than the friction driving the tank to rotate, the polishing belt will perform its polishing function. Therefore, this embodiment uses two driving wheels to drive the tank to rotate, doubling the friction driving the tank to rotate, thereby increasing the friction between the polishing belt and the tank body, and thus increasing the polishing efficiency.

[0029] In this embodiment, the polishing belt 43 is mounted on the drive shaft 42 and the driven shaft 44. The central rotating frame of the basket telescopic component II 33 is rotated, causing the basket telescopic component II 33 to retract. The rotating rod 34 rotates around the fixed shaft 35, tightening the polishing belt 43. Then, the central rotating frame of the basket telescopic component I 31 is rotated, causing the basket telescopic component I 31 to extend. The rocker arm 32 rotates around the drive shaft 42, and the polishing belt 43 flexibly contacts the outer circumferential surface of the tank. The rotating tank motor 11 is driven, causing the tank body 5 to rotate, which in turn drives the polishing motor 41, activating the polishing belt. The trolley is then driven to move slowly along the axial direction of the tank body, achieving polishing of the entire outer circumferential surface of the tank body. Example

[0030] In Example 1, the power to drive the tank rotation comes from the friction between the tank and the driving wheel. Rubber is fitted onto the surface of the driving wheel to increase the coefficient of friction, making this method suitable for tanks with a large thickness and heavy weight. This example can be used when the tank is thin, lightweight, and the friction between the driving wheel and the outer circumference of the tank is small. In this example, the roller device 1 includes four driven wheels and a driving device. All four rollers supporting the tank rotation are driven wheels. The structure of the driving device is shown in the attached figure. Figure 3 and attached Figure 4As shown, the system includes a drive wheel 13, a reducer 12, a tank motor 11, a rotating frame 16, a rotating shaft 17, and a pry bar 18. The drive wheel 13, reducer 12, and tank motor 11 are fixedly mounted on the rotating frame 16. The drive wheel 13 is located inside the tank body 5. The rotating frame 16 rotates around the rotating shaft 17, which is fixed to the ground. One end of the rotating shaft 17 is a square column, which cooperates with the pry bar 18. The pry bar 18 is fitted onto the square column. Rotating the rotating shaft 17 drives the tank motor 11, reducer 12, and drive wheel 13 on the rotating frame 16 to rotate together.

[0031] Ideally, the circumference of the center of the drive wheel 13 rotating around the rotating shaft 17 should pass through the center of the roller. In this way, regardless of the diameter or wall thickness of the tank, the reaction force of the drive wheel 13 on the inner surface of the tank is provided by the driven roller that works with it. Other driven rollers do not provide the reaction force of this pressure, and the tank will not deform.

[0032] In this embodiment, during polishing, the driving wheel 13 is first rotated away from the driven rollers using the pry bar 18. A crane is then used to place the tank 5 onto the four driven rollers, with the driving wheel 13 located inside the tank 5. After the tank is positioned, the pry bar 18 is rotated to press the driving wheel 13 onto the inner surface of the tank. The friction generated on the inner surface of the tank by the weight of the driving wheel 13, the reducer 12, and the rotating motor 11 on the rotating frame 16 provides rotational power for the tank's rotation. If the weight of these components is insufficient to generate enough friction, a counterweight can be added to the rotating frame, or a pad 19 can be inserted between the pry bar 18 and the ground. The torque of the pry bar 18 provides pressure on the inner surface of the tank, increasing the friction driving the tank's rotation. The operation of the polishing device is the same as in Embodiment 1. Example

[0033] The structure of this embodiment is as shown in the attached figure. Figure 5 As shown, polishing devices are installed on both sides of the tank 5. The frictional forces of the two polishing belts against the outer circumferential surface of the tank are in opposite directions, thus canceling out the rotational torque generated by the two polishing belts on the tank and reducing the adverse effect of polishing friction on the rotation of the tank. In this embodiment, two polishing devices are used to polish the outer circumferential surface of the tank simultaneously, doubling the polishing efficiency.

[0034] A driving gear 20 is installed on the shaft of the driving wheel, and a driven gear 21 is installed on the extended shaft of the driving wheel's roller. When the driving wheel contacts the inner surface of the tank, the driving gear and the driven gear engage in transmission. The transmission ratio is related to the thickness of the tank and should ensure that the angular velocities of the inner and outer surfaces of the tank are the same. That is, the angular velocity of the tank's rotation caused by the friction between the driving wheel and the inner surface of the tank is the same as the angular velocity of the tank's rotation caused by the friction between the roller and the outer surface of the tank. While the driving wheel drives the tank to rotate, the roller also drives the tank to rotate, thus increasing the friction force driving the tank's rotation. This condition applies to tanks with uniform outer diameter and thickness, i.e., it is suitable for batch polishing production of tanks of the same specifications and dimensions.

[0035] The aforementioned flower basket telescopic component can be replaced by a hydraulic cylinder or a pneumatic cylinder to facilitate semi-automation or automation. The friction between the polishing belt and the outer circumference of the tank is fed back by hydraulic or pneumatic pressure, which is more intuitive.

[0036] This invention provides a frictional force for the rotation of the tank on its outer surface and / or inner surface. This frictional force is greater than the frictional force of the polishing belt, or the frictional force of the polishing belt is in the opposite direction, partially canceling each other out, thus ensuring smooth polishing of the outer circumferential surface of the tank. The belt polisher is mounted on a connecting rod frame. The rotation and stabilization of the rocker arm on the connecting rod frame allows for adjustment of the polishing frictional force. The polishing belt makes flexible contact with the outer circumferential surface of the tank, and the movement of the carriage ensures smooth polishing of the outer circumferential surface, completely replacing manual labor. This not only reduces labor intensity but also improves polishing efficiency. This invention has no special structure, low manufacturing cost, and can adapt to tanks of different diameters and lengths.

Claims

1. A polishing machine for the outer circumferential surface of a tank, characterized in that: It includes a roller device and a polishing device; the polishing device includes a trolley (2), a connecting rod frame (3) and a belt polisher (4); the belt polisher (4) is mounted on the connecting rod frame (3), and the connecting rod frame (3) is mounted on the trolley (2); The linkage (3) includes a flower basket telescopic component I (31), a rocker arm (32), a flower basket telescopic component II (33), and a rotating rod (34); a fixed shaft (35) is provided in the middle of the rotating rod (34), and a connecting shaft (36) is fixed in the middle of the rocker arm (32); the lower end of the rocker arm (32) is rotatably connected to the drive shaft (42) of the belt polisher (4), and the upper end of the rocker arm (32) is rotatably connected to the fixed shaft (35); the connecting shaft (36) rotatably connects the flower basket telescopic component I (31) and the flower basket extension... One end of the retractable part II (33) and the other end of the basket telescopic part I (31) are rotatably connected to the end shaft I (37), the end shaft I (37) and the drive shaft (42) are fixed on the trolley; the other end of the basket telescopic part II (33) is rotatably connected to the end shaft II (38), the end shaft II (38) is fixed to the lower end of the rotating rod (34), the upper end of the rotating rod (34) is rotatably connected to the driven shaft (44) of the belt polisher (4); polishing belts (43) are installed on the drive shaft (42) and the driven shaft (44).

2. The tank outer circumferential surface polishing machine according to claim 1, characterized in that: The polishing device is located on both sides of the tank, and the two polishing belts (43) generate rotational torques on the tank in opposite directions.

3. The outer circumferential surface polishing machine for a tank as described in claim 1, characterized in that: The roller device includes two driven wheels and a driving device. The shafts of the two driving wheels (13) of the driving device are connected by a coupling (14) and a long shaft (15). The driving wheels (13) support the outer circumference of the tank.

4. A polishing machine for the outer circumferential surface of a tank according to claim 1, characterized in that: The roller device includes four driven rollers and a drive device. The drive device includes a drive wheel (13), a reducer (12), a tank motor (11), a rotating frame (16), a rotating shaft (17), and a pry bar (18). The drive wheel (13) is located inside the tank and engages with the inner surface of the tank. The drive wheel (13), the reducer (12), and the tank motor (11) are fixedly mounted on the rotating frame (16). The rotating frame (16) rotates around the rotating shaft (17). The rotating shaft (17) is fixed to the ground. One end of the rotating shaft (17) is a square post, and the square post is fitted with the pry bar (18).

5. A polishing machine for the outer circumferential surface of a tank according to claim 4, characterized in that: The circumference of the center of the drive wheel (13) rotating around the rotation axis (17) passes through the center of the roller that it mates with.

6. A polishing machine for the outer circumferential surface of a tank according to claim 4, characterized in that: Add a counterweight to the rotating frame (16), or insert a pad (19) between the pry bar (18) and the ground.

7. A polishing machine for the outer circumferential surface of a tank according to claim 5, characterized in that: A drive gear (20) is installed on the shaft of the drive wheel (13), and a driven gear (21) is installed on the shaft of the mating roller. The transmission ratio of the drive gear (20) and the driven gear (21) makes the rotational angular velocity of the tank the same.

8. A polishing machine for the outer circumferential surface of a tank according to claim 1, characterized in that: The structures of the flower basket telescopic component I (31) and the flower basket telescopic component II (33) are the same, including a middle rotating frame and screws connected by threads at both ends, with the thread directions of the screws at both ends being opposite.

9. A polishing machine for the outer circumferential surface of a tank according to claim 1, characterized in that: The flower basket telescopic component I (31) and flower basket telescopic component II (33) are replaced by hydraulic cylinders or pneumatic cylinders.

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