Rotating device and rotating method for keeping rotating center of square and round tank body unchanged

Abstract

The invention relates to a rotating device and a rotating method, in particular to a rotating device and a rotating method for keeping the rotating center of a square and round tank unchanged, and solves the problems that when an existing square and round tank rotates on a roller carrier, operation is tedious, and the installation precision of an external tool and the tank is seriously dependent. And the production efficiency and the quality are greatly influenced. The device comprises a plurality of rotating units and a control unit, wherein each rotating unit comprises a base, two propelling mechanisms arranged on the base, two guide mechanisms, two distance measuring mechanisms and driving equipment; the propelling mechanism is matched with the roller assembly to be used for pushing the square and round tank body to keep the rotating center unchanged for rotating operation in a normal position state; the control unit is used for respectively controlling the expansion amount of the propelling mechanism and the rotation amount of the roller assembly through the driving equipment so as to control the normal rotation of the square and round tank body. According to the method, the overlap ratio of the central axis and the rotation axis of the actual square and round tank body and the operation quality are improved.

Description

Technical Field

[0001] The invention relates to a rotating device and a rotating method, and in particular to a rotating device and a rotating method capable of keeping the rotating center of a square round tank unchanged. Background Art

[0002] With the continuous development of tank containers and chemical transportation industries, the volume of containers in a specified limited space has received more and more attention. Square and round tanks are increasingly used in the transportation of liquid media. However, there is a big difference between the rotation of square and round tanks in the manufacturing process. When a round tank rotates on an ordinary roller frame, the center of rotation can be kept stable. During the welding, flaw detection, assembly and other processes in the manufacturing process, the operating point can be kept relatively stable, which improves the quality and efficiency of welding, flaw detection, and assembly. Since the outer periphery of the square and round tank is square and round, when the tank rotates on an ordinary roller frame, the center of rotation changes all the time, so the position of the operating point on the tank will change greatly. However, the welding, flaw detection, and assembly of the tank require that the relative position of a point on the surface of the tank remain as unchanged as possible or the fluctuation is relatively small.

[0003] In order to meet the above requirements, at present, for operations on square and round tank bodies, two circular rings are generally fixed directly on the ends or outer periphery of the tank body, so that the center of the circular ring coincides with the rotation center of the square and round tank body, and the tank body with the circular ring installed or welded is placed on an ordinary roller frame for rotation. Alternatively, a positioner is directly used to clamp the ends of the square and round tank body, and the positioner is turned to drive the tank body to rotate along a rotation center. The first operation requires the production of circular ring tooling and the installation or spot welding of circular rings on the tank body, and the installation or welding of circular rings is relatively cumbersome, affecting the work efficiency; in addition, the installation accuracy of the circular ring will affect the rotation effect of the tank body, and thus affect the quality and efficiency of the assembly and welding flaw detection operations. The second operation requires a clamping mechanism for a rotary positioner, which is relatively complex and has a high manufacturing cost. Since the positioner occupies a large area, this method requires a certain equipment foundation. In addition, the process of installing the tank body on the rotary positioner is complicated and the installation time is long, which affects the operation efficiency. In addition, there are certain accuracy requirements for the clamping position of the rotary positioner claws and the tank body, which can easily cause the actual rotation axis to deviate from the geometric center of the tank body, affecting subsequent welding, assembly, flaw detection and other operations.

[0004] In summary, when the existing square and round tanks rotate on the roller frame, the operation is relatively cumbersome and heavily depends on the installation accuracy of the external tooling and the tank, which greatly affects the production efficiency and quality. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when the existing square or round tank body rotates on a roller frame, the operation is cumbersome and seriously depends on the installation accuracy of the external tooling and the tank body, which greatly affects the production efficiency and quality, and to provide a rotating device and a rotating method for keeping the rotation center of the square or round tank body unchanged.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A rotating device for keeping the rotation center of a square-shaped tank unchanged, which is special in that: it comprises a plurality of rotating units and a control unit, each rotating unit comprises a base, two propulsion mechanisms arranged on the base, two guide mechanisms, two distance measuring mechanisms and a driving device; the plurality of rotating units are arranged below the square-shaped tank along the length direction of the square-shaped tank;

[0008] In each rotating unit, two propulsion mechanisms, two guide mechanisms and two distance measuring mechanisms are symmetrically arranged on both sides of the length direction of the square round tank body; the end of the propulsion mechanism away from the base is a telescopic end, and a roller assembly is arranged at the telescopic end. The roller assembly and the propulsion mechanism are electrically connected to the driving device respectively. The roller assembly is used to push the square round tank body to rotate to the correct position. The telescopic end of the propulsion mechanism cooperates with the roller assembly to push the square round tank body to rotate in the correct position while keeping the rotation center unchanged;

[0009] The upper end surface of the guide mechanism is parallel to the central axis of the propulsion mechanism, and the upper end of the guide mechanism is adapted to the roller assembly, so as to guide the roller assembly when the propulsion mechanism is extended or retracted;

[0010] The two distance measuring mechanisms are arranged opposite to each other, and the two distance measuring mechanisms are respectively provided with reference surfaces facing the square-shaped tank body; the two reference surfaces are symmetrical with respect to the central axis of the square-shaped tank body, and in the normal position, the centers of the two reference surfaces and the central axis of the square-shaped tank body are located in the same horizontal plane; the two distance measuring mechanisms are used to connect with the control device to monitor the horizontal distance between the outer surfaces of both sides of the square-shaped tank body and the reference surfaces in real time. When the square-shaped tank body is in the normal position, the horizontal distance between the outer surfaces of both sides of the square-shaped tank body and the reference surfaces is the largest and equal;

[0011] The distance measuring mechanism and the driving device are respectively connected to the control unit for communication. The control unit is used to control the extension and retraction amount of the propulsion mechanism and the rotation amount of the roller assembly through the driving device, thereby controlling the normal rotation of the square circular tank body.

[0012] Furthermore, the guide mechanism includes a guide base; the lower end of the guide base is connected to the base, the upper end surface of the guide base is an inclined surface, the inclined surface is parallel to the central axis of the propulsion mechanism, and a guide groove adapted to the roller assembly is arranged on the inclined surface.

[0013] Furthermore, the roller assembly includes a U-shaped shell, a rotating shaft, a roller, and a bearing arranged inside the U-shaped shell; the two ends of the rotating shaft are rotatably connected to the two side walls of the U-shaped shell through bearings, and one end of the rotating shaft is connected to the driving device; the roller fixed sleeve is arranged on the rotating shaft and is located between the two side walls of the U-shaped shell; the outer side of the bottom of the U-shaped shell is adapted to the guide groove.

[0014] Furthermore, the propulsion mechanism includes a propulsion base and an electric push rod connected to a driving device; the propulsion base is arranged on a base; the telescopic end of the electric push rod is connected to a U-shaped shell, and the fixed end is connected to the driving device and then arranged on the propulsion base, and the angle between the central axis of the electric push rod and the horizontal plane is equal to the angle between the diagonal of the lower circular tank body in the normal position and the horizontal plane.

[0015] Furthermore, the distance measuring mechanism includes a distance measuring device and mounting plates connected to a base and symmetrically arranged on both sides of the length direction of the square circular tank body; two distance measuring devices are arranged on the two mounting plates opposite to each other.

[0016] Furthermore, the number of the rotating units is 2;

[0017] The driving device includes two servo motors and two reducers connected to the control unit; the output shaft of one servo motor is connected to one end of the rotating shaft through the reducer, and the output shaft of the other servo motor is connected to the fixed end of the electric push rod through the reducer;

[0018] Alternatively, the driving device includes two servo hydraulic systems connected to the control unit, wherein one servo hydraulic system is connected to one end of the rotating shaft, and the other servo hydraulic system is connected to the fixed end of the electric push rod.

[0019] At the same time, the present invention also provides a rotation method for keeping the rotation center of the square round tank unchanged. Based on the above-mentioned rotation device for keeping the rotation center of the square round tank unchanged, the method is special in that it includes the following steps:

[0020] 1] Place the square round tank on the roller assembly, and the control unit controls the roller assembly through the driving device to drive the square round tank to rotate, and at the same time uses the distance measuring mechanism to measure the horizontal distances L1 and L2 between the outer surfaces of both sides of the square round tank and the reference surface in real time;

[0021] 2] Determine whether L1 and L2 are equal and maximum:

[0022] If they are equal and the largest, the square round tank is in the normal position and execute step 3]; otherwise, return to step 1];

[0023] 3] The control unit controls the propulsion mechanism and the roller assembly through the driving device according to the rotation of the square round tank body, so that the square round tank body rotates while keeping the rotation center unchanged.

[0024] Further, step 1] is specifically as follows:

[0025] The square round tank body is placed on the roller, and the control unit controls the roller to drive the square round tank body to rotate through the driving device and the rotating shaft. At the same time, the distance measuring device is used to measure the horizontal distances L1 and L2 between the outer surfaces on both sides of the square round tank body and the two reference planes in real time.

[0026] Further, step 3] is specifically as follows:

[0027] According to the rotation of the square round tank body, the control unit controls the electric push rod and the roller extension and retraction through the driving device to compensate for the displacement difference Lp between the initial center axis and the rotation center axis of the square round tank body, so as to complete the rotation of the square round tank body while keeping the rotation center unchanged.

[0028] Furthermore, in step 2], the square round tank body is in the correct position as follows:

[0029] The displacement difference Lp between the initial center axis and the rotation center axis of the square circular tank body is 0, and then the outer surfaces of both sides of the square circular tank body are marked.

[0030] Beneficial effects of the present invention:

[0031] 1. The present invention provides a rotating device for keeping the rotation center of a square round tank unchanged, which solves the problem of the rotation center of the square round tank jumping and fluctuating up and down during the rotation operation of an ordinary roller frame, so that the square round tank can rotate with its central axis as a fixed rotation axis during rotation, reduces the problem of excessive changes in the position of the square round tank from operators and machines during welding, assembly of accessories, and flaw detection on the surface operating points of the square round tank, and reduces the operating difficulty of the machine and personnel.

[0032] 2. The present invention provides a rotating device that keeps the rotation center of the square-circular tank unchanged, which can reduce the complexity of the rotating equipment mechanism, reduce the floor space, and avoid the use of a fixed foundation such as a foundation.

[0033] 3. The present invention provides a rotating device that keeps the rotation center of the square round tank body unchanged, eliminating the need to install auxiliary tooling such as a rotating ring during rotation, thereby improving operating efficiency and the convenience of placing the square round tank body, and avoiding welding corresponding connecting blocks on the surface of the square round tank body.

[0034] 4. The present invention provides a rotation method for keeping the rotation center of a square-shaped tank unchanged, thereby improving the coincidence degree between the center axis of the actual square-shaped tank and the rotation axis and the operation quality, and better meeting the adaptation requirements of digital equipment.

[0035] 5. The present invention provides a rotation method for keeping the rotation center of a square-shaped tank unchanged, which can realize the rapid alignment and adjustment of the square-shaped tank. When used in welding, flaw detection and other operations, the positioning accuracy of the weld and the operation point is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of an embodiment of a rotating device for keeping the rotation center of a square-shaped tank unchanged according to the present invention;

[0037] Figure 2 It is a structural schematic diagram of a roller assembly in an embodiment of a rotating device for keeping the rotation center of a square-shaped tank unchanged according to the present invention;

[0038] Figure 3 It is a structural schematic diagram of a roller assembly and a guide mechanism in an embodiment of a rotating device for keeping the rotation center of a square-shaped tank unchanged according to the present invention;

[0039] Figure 4 It is a structural schematic diagram of two rotating units in an embodiment of a rotating device for keeping the rotating center of a square-shaped tank unchanged according to the present invention;

[0040] Figure 5 It is a structural schematic diagram of an embodiment of a rotating device for keeping the rotation center of a square-shaped tank body unchanged according to the present invention, in which the horizontal distances between the reference plane of the distance measuring device and the outer surfaces of both sides of the square-shaped tank body during the rotation are L1 and L2 respectively;

[0041] Figure 6 It is a structural schematic diagram of an embodiment of a rotating device for keeping the rotation center of a square-circular tank unchanged in the present invention, in which an electric push rod compensates for the displacement difference of the rotation center axis during rotation, wherein the extension distances of the electric push rod are L3 and L4 respectively.

[0042] Description of reference numerals:

[0043] 1-base, 2-guide mechanism, 21-guide base, 3-propelling mechanism, 31-propelling base, 4-mounting plate, 5-electric push rod, 6-roller assembly, 7-guide slide, 61-U-shaped housing, 62-rotating shaft, 63-roller, 64-bearing, 8-distance measuring device, 9-square round tank body, 10-flange, 11-distance measuring mechanism. DETAILED DESCRIPTION

[0044] like Figure 1As shown, a rotating device for keeping the rotation center of a square round tank unchanged comprises two rotating units and a control unit, each rotating unit comprises a base 1, two propulsion mechanisms 3, two guide mechanisms 2, two distance measuring mechanisms 11 and a driving device arranged on the base 1; a plurality of rotating units are arranged below the square round tank 9 along the length direction of the square round tank 9; in each rotating unit, two propulsion mechanisms 3, two guide mechanisms 2 and two distance measuring mechanisms 11 are symmetrically arranged on both sides of the length direction of the square round tank 9; the propulsion mechanisms 3 The end away from the base 1 is a telescopic end, and a roller assembly 6 is provided at the telescopic end. The roller assembly 6 and the propulsion mechanism 3 are electrically connected to the driving device respectively. The roller assembly 6 is used to push the square round tank body 9 to rotate to the normal position. The telescopic end of the propulsion mechanism 3 cooperates with the roller assembly 6 to push the square round tank body 9 to keep the rotation center unchanged in the normal position for rotation operation; the upper end surface of the guide mechanism 2 is parallel to the central axis of the propulsion mechanism 3, and the upper end of the guide mechanism 2 is adapted to the roller assembly 6, which is used to guide the roller assembly 6 when the propulsion mechanism 3 is telescoped.

[0045] The two distance measuring mechanisms 11 are arranged opposite to each other, and the two distance measuring mechanisms 11 are respectively provided with reference surfaces facing the square circular tank body 9; the two reference surfaces are symmetrical with respect to the central axis of the square circular tank body 9, and in the normal position, the centers of the two reference surfaces are located in the same horizontal plane as the central axis of the square circular tank body 9; the two distance measuring mechanisms 11 are used to be connected to the control device to monitor the horizontal distance between the outer surfaces of both sides of the square circular tank body 9 and the reference surfaces in real time. When the square circular tank body 9 is in the normal position, the horizontal distance between the outer surfaces of both sides and the reference surfaces is the largest and equal; the distance measuring mechanism 11 and the driving device are respectively communicated with the control unit, and the control unit is used to control the extension and retraction amount of the propulsion mechanism 3 and the rotation amount of the roller assembly 6 through the driving device, thereby controlling the normal rotation of the square circular tank body 9.

[0046] like Figure 2 , Figure 3 As shown, the guide mechanism 2 includes a guide base 21; the lower end of the guide base 21 is connected to the base 1, the upper end surface of the guide base 21 is an inclined surface, the inclined surface is parallel to the central axis of the propulsion mechanism 3, and a guide groove 7 adapted to the roller assembly 6 is arranged on the inclined surface. The wheel assembly 6 includes a U-shaped shell 61, a rotating shaft 62 arranged inside the U-shaped shell 61, a roller 63, and a bearing 64; the two ends of the rotating shaft 62 are respectively rotatably connected to the two side walls of the U-shaped shell 61 through the bearing 64, and one end of the rotating shaft 62 is connected to the driving device; the roller 63 is fixedly sleeved on the rotating shaft 62 and is located between the two side walls of the U-shaped shell 61; the outer side of the bottom of the U-shaped shell 61 is adapted to the guide groove 7.

[0047] like Figure 4As shown, the propulsion mechanism 3 includes a propulsion base 31 and an electric push rod 5 connected to the driving device; the propulsion base 31 is arranged on the base 1; the telescopic end of the electric push rod 5 is connected to the U-shaped housing 61, and the fixed end is connected to the driving device and arranged on the propulsion base 31, and the angle between the central axis of the electric push rod 5 and the horizontal plane is equal to the angle between the diagonal line of the lower circular tank body 9 and the horizontal plane in the normal state. The distance measuring mechanism 11 includes a distance measuring device 8, and a mounting plate 4 connected to both sides of the base 1 and corresponding to both sides of the square circular tank body 9 along the length direction; the distance measuring device 8 is arranged on the mounting plate 4, and corresponds to each other.

[0048] In this embodiment, the base 1 serves as the foundation of the entire device; the guide base 21 is the installation base 1 of the guide chute 7; the propulsion base 31 is the support seat of the electric push rod 5; the mounting plate 4 is the mounting seat of the distance measuring device 8; the electric push rod 5 is used to provide corresponding thrust for the roller assembly 6 and accurately push the roller assembly 6 to a specified displacement, and the telescopic end of the electric push rod 5 is connected to the bottom of the U-shaped shell 61 of the roller assembly 6 through a threaded flange 10 to achieve accurate pushing; the stroke of the electric push rod 5 is greater than the maximum diagonal of the square round tank body 9 minus the minimum width or height. The roller 63 can accurately control the speed and move along the axis direction of the electric push rod 5; the guide chute 7 is mainly used to guide the roller 63 to keep the movement of the roller 63 always in a stable state; the distance measuring device 8 is mainly used to measure the horizontal distance from the outer surface of both sides of the square round tank body 9 to the reference surface of the distance measuring device 8. The driving device includes two servo motors and two reducers connected to the control unit; the output shaft of one servo motor is connected to one end of the rotating shaft 62 through the reducer, and the output shaft of the other servo motor is connected to the fixed end of the electric push rod 5 through the reducer; in other embodiments, the driving device includes two servo hydraulic systems connected to the control unit, one servo hydraulic system is connected to one end of the rotating shaft 62, and the other servo hydraulic system is connected to the fixed end of the electric push rod 5.

[0049] The present invention provides a rotating device for keeping the rotation center of a square round tank unchanged, and its main purpose is to keep the central axis position of the square round tank 9 always unchanged during rotation, so that the square round tank 9 is in a state of minimum vibration during operation. When the roller 63 is started to rotate, the electric push rod 5 synchronously pushes the roller 63 along the axis direction of the electric push rod 5 so that the roller 63 moves according to the calculated compensation amount, so that the initial central axis of the square round tank 9 coincides with the rotation central axis.

[0050] In order to ensure that the initial state of the rotation of the square round tank body 9 is in the positive position state (that is, the distances between the outer surfaces of the two sides of the square round tank body 9 and its central axis are equal). At this time, the roller 63 is in the initial state. When the horizontal distances between the outer surfaces of the two sides of the square round tank body 9 and the reference plane of the distance measuring device 8 are not equal, the distance measuring device 8 is used to detect the horizontal distances between the outer surfaces of the two sides of the square round tank body 9 and the reference plane of the distance measuring device 8 in real time, until the distance measuring device 8 measures that the horizontal distances between the outer surfaces of the two sides of the square round tank body 9 and the reference plane of the distance measuring device 8 are equal, and the square round tank body 9 is in the positive position state. The present invention uses the propulsion mechanism 3 to push the roller assembly 6 to adjust the relative position of the central axis of the square round tank body 9, ensuring that the square round tank body 9 rotates with a fixed rotating shaft when rotating, and does not need to install an auxiliary rotating ring (a circular ring fixed on the tank to assist the square round tank body 9 to rotate), does not need to be configured with an end clamping welding positioner, and directly placing the square round tank body 9 on the device can achieve stable central rotation.

[0051] At the same time, the present invention also provides a rotation method for keeping the rotation center of the square round tank unchanged. The rotation device for keeping the rotation center of the square round tank unchanged comprises the following steps:

[0052] 1] After the two propulsion mechanisms 3 are in a preset initial state, the square round tank body 9 is placed on the roller 63, and the control unit controls the roller 63 to drive the square round tank body 9 to rotate through the driving device and the rotating shaft 62, and at the same time uses the distance measuring device 8 to measure the horizontal distances L1 and L2 between the outer surfaces of both sides of the square round tank body 9 and the two reference surfaces in real time;

[0053] 2] Determine whether L1 and L2 are equal and maximum:

[0054] If they are equal and the largest, the square round tank body 9 is in the positive position, and the displacement difference Lp between its initial central axis and the rotation central axis is 0. Then, after marking the outer surfaces of both sides of the square round tank body 9 (for easy placement during the next operation), execute step 3]; otherwise, return to step 1];

[0055] 3] The control unit controls the electric push rod 5 and the roller 63 to compensate for the displacement difference Lp between the initial center axis and the rotation center axis of the square round tank body 9 through the driving device according to the rotation of the square round tank body 9, so as to complete the rotation of the square round tank body 9 while keeping the rotation center unchanged.

[0056] like Figure 5As shown, when the square round tank body 9 is hoisted onto the device of the present invention, the square round tank body 9 is in a non-positive position state, and the horizontal distances between the reference plane of the distance measuring device 8 and the outer surfaces of the two sides of the square round tank body 9 are L1 and L2 respectively, and L1≠L2; at this time, the central axis of the square round tank body 9 and the central axis after rotation will have a displacement difference Lp. In this state, only the roller 63 rotates (because the square round tank body 9 and the roller 63 gradually slip during operation, so the electric push rod 5 does not move at this time, and only the roller 63 rotates). At the same time, the distance measuring device 8 is used to compare the difference between L1 and L2 in real time. When the difference between L1 and L2 is 0 and the maximum, it means that the square round tank body 9 is in a positive position state, and it can be used as a zero point positioning for welding, flaw detection, assembly and other operations. Taking welding operation as an example, when the welding machine recognizes that the square round tank body 9 is in a positive position, the welding machine is started to start welding, the square round tank body 9 starts to rotate, and the electric push rod 5 is started synchronously to move along its axis direction.

[0057] like Figure 6 As shown, the telescopic distances of the electric push rod 5 during the rotation in the upright state are L3 and L4 respectively, which are used to compensate for the displacement difference Lp of the rotation center axis. By continuously adjusting L3 and L4, the stability of the center axis of the square round tank body 9 is achieved, and finally the rotation stability of the square round tank body 9 is achieved, until the operation is completed and restored to the upright state, and the square round tank body 9 is translated out of the work station by using an overhead crane or a bottom translation vehicle to complete the operation.

Claims

1. A rotating device for keeping the rotation center of a square-shaped tank unchanged, characterized in that: The invention comprises a plurality of rotating units and a control unit, each rotating unit comprising a base (1), two propulsion mechanisms (3) arranged on the base (1), two guide mechanisms (2), two distance measuring mechanisms (11) and a driving device; the plurality of rotating units are arranged below the square circular tank body (9) along the length direction of the square circular tank body (9); In each rotating unit, two propulsion mechanisms (3), two guide mechanisms (2) and two distance measuring mechanisms (11) are symmetrically arranged on both sides of the length direction of the square round tank body (9); the end of the propulsion mechanism (3) away from the base (1) is a telescopic end, and the telescopic end is provided with a roller assembly (6), and the roller assembly (6) and the propulsion mechanism (3) are respectively electrically connected to the driving device, and the roller assembly (6) is used to push the square round tank body (9) to rotate to a normal position state, and the telescopic end of the propulsion mechanism (3) cooperates with the roller assembly (6) to push the square round tank body (9) to rotate in the normal position state to keep the rotation center unchanged; The upper end surface of the guide mechanism (2) is parallel to the central axis of the propulsion mechanism (3), and the upper end of the guide mechanism (2) is matched with the roller assembly (6) to guide the roller assembly (6) when the propulsion mechanism (3) is extended or retracted; The two distance measuring mechanisms (11) are arranged opposite to each other, and the two distance measuring mechanisms (11) are respectively provided with reference surfaces facing the square round tank body (9); the two reference surfaces are symmetrical with respect to the central axis of the square round tank body (9), and in the normal position, the centers of the two reference surfaces and the central axis of the square round tank body (9) are located in the same horizontal plane; the two distance measuring mechanisms (11) are used to connect with the control device to monitor the horizontal distance between the outer surfaces of both sides of the square round tank body (9) and the reference surfaces in real time, and when the square round tank body (9) is in the normal position, the horizontal distance between the outer surfaces of both sides of the square round tank body (9) and the reference surfaces is the largest and equal; The distance measuring mechanism (11) and the driving device are respectively connected to the control unit for communication. The control unit is used to control the extension and retraction amount of the propulsion mechanism (3) and the rotation amount of the roller assembly (6) through the driving device, thereby controlling the normal rotation of the square round tank body (9).

2. According to claim 1, a rotating device for keeping the rotation center of a square-shaped tank unchanged, characterized in that: The guide mechanism (2) comprises a guide base (21); The lower end of the guide base (21) is connected to the base (1), the upper end surface of the guide base (21) is an inclined surface, the inclined surface is parallel to the central axis of the propulsion mechanism (3), and a guide groove (7) adapted to the roller assembly (6) is provided on the inclined surface.

3. According to claim 2, a rotating device for keeping the rotation center of a square-shaped tank unchanged, characterized in that: The roller assembly (6) comprises a U-shaped housing (61), a rotating shaft (62) arranged inside the U-shaped housing (61), a roller (63), and a bearing (64); The two ends of the rotating shaft (62) are respectively rotatably connected to the two side walls of the U-shaped housing (61) through bearings (64), and one end of the rotating shaft (62) is connected to a driving device; The roller (63) is fixedly sleeved on the rotating shaft (62) and is located between two side walls of the U-shaped housing (61); The outer side of the bottom of the U-shaped housing (61) is adapted to the guide slide groove (7).

4. A rotating device for keeping the rotation center of a square-shaped tank unchanged according to claim 3, characterized in that: The propulsion mechanism (3) comprises a propulsion base (31) and an electric push rod (5) connected to a driving device; The propulsion base (31) is arranged on the base (1); The telescopic end of the electric push rod (5) is connected to the U-shaped housing (61), and the fixed end is connected to the driving device and then arranged on the propulsion base (31). The angle between the central axis of the electric push rod (5) and the horizontal plane is equal to the angle between the diagonal of the lower circular tank body (9) and the horizontal plane in the normal position.

5. A rotating device for keeping the rotation center of a square-shaped tank unchanged according to claim 4, characterized in that: The distance measuring mechanism (11) comprises a distance measuring device (8), and mounting plates (4) connected to the base (1) and symmetrically arranged on both sides of the square round tank body (9) in the length direction; The two distance measuring devices (8) are arranged oppositely on two mounting plates (4).

6. According to claim 1, a rotating device for keeping the rotation center of a square-shaped tank unchanged, characterized in that: There are two rotating units; The driving device comprises two servo motors and two reducers connected to the control unit; The output shaft of one of the servo motors is connected to one end of the rotating shaft (62) via a speed reducer, and the output shaft of the other servo motor is connected to the fixed end of the electric push rod (5) via a speed reducer; Alternatively, the driving device comprises two servo hydraulic systems connected to the control unit, wherein one servo hydraulic system is connected to one end of the rotating shaft (62), and the other servo hydraulic system is connected to the fixed end of the electric push rod (5).

7. A rotation method for keeping the rotation center of a square-shaped tank unchanged, based on the rotation device for keeping the rotation center of a square-shaped tank unchanged according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1] The square round tank body (9) is placed on the roller assembly (6), and the control unit controls the roller assembly (6) through the driving device to push the square round tank body (9) to rotate, and at the same time, the distance measuring mechanism (11) is used to measure the horizontal distances L1 and L2 between the outer surfaces of both sides of the square round tank body (9) and the reference surface in real time; 2] Determine whether L1 and L2 are equal and maximum: If they are equal and the largest, the square round tank body (9) is in the normal position, and step 3] is executed; Otherwise, return to step 1]; 3] The control unit controls the propulsion mechanism (3) and the roller assembly (6) through the driving device according to the rotation of the square round tank body (9), so as to rotate the square round tank body (9) while keeping the rotation center unchanged.

8. A rotation method for keeping the rotation center of a square-shaped tank unchanged according to claim 7, characterized in that: Step 1] Specifically: A square round tank body (9) is placed on a roller (63), and a control unit controls the roller (63) to drive the square round tank body (9) to rotate via a driving device and a rotating shaft (62), while a distance measuring device (8) is used to measure in real time the horizontal distances L1 and L2 between the outer surfaces of both sides of the square round tank body (9) and two reference planes.

9. A rotation method for keeping the rotation center of a square-shaped tank unchanged according to claim 8, characterized in that: Step 3] Specifically: According to the rotation of the square round tank body (9), the control unit controls the electric push rod (5) through the driving device to cooperate with the roller (63) to telescope and compensate for the displacement difference Lp between the initial center axis and the rotation center axis of the square round tank body (9), so as to complete the rotation of the square round tank body (9) while keeping the rotation center unchanged.

10. A rotation method for keeping the rotation center of a square-shaped tank unchanged according to claim 9, characterized in that: In step 2], the square round tank body (9) is in the normal position as follows: The displacement difference Lp between the initial center axis and the rotation center axis of the square circular tank body (9) is 0, and then the outer surfaces of both sides of the square circular tank body (9) are marked.

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