Device and method for measuring size, shape and position of inner wall of circular barrel of large container

Abstract

The invention discloses a large container circular cylinder inner wall size, shape and position measuring device and method, the measuring device comprises a base and a measuring assembly, the base is rotatably connected with a rotating stand, the rotating stand is provided with a lifting mechanism, the lifting mechanism extends into the cylinder, and the center line of the base and the rotation axis of the rotating stand coincide with the axis of the cylinder; the measuring assembly is located in the cylinder and comprises a horizontally-arranged measuring rod and a sliding cylinder, the connecting end of the measuring rod is connected with the lifting mechanism, the measuring end of the measuring rod is in sliding fit with the sliding cylinder, and an elastic piece is arranged between the sliding cylinder and the measuring rod and used for driving the sliding cylinder to move towards the inner wall of the cylinder. The connecting end of the measuring rod is located at the axis of the cylinder, and the measuring end of the measuring rod is provided with scales in the length direction of the measuring rod. The lifting mechanism is used for driving the measuring assembly to lift. The method and the device have the effects of improving the measurement precision and the measurement convenience.

Description

Technical Field

[0001] The present application relates to the field of large-scale container manufacturing and inspection, and in particular to a device and method for measuring the shape and position of the inner wall of a circular cylinder of a large-scale container. Background Art

[0002] At present, in the manufacturing process of large containers, the measurement of the inner wall size and geometric tolerance of circular cylinders is an important link. Traditional measurement methods mainly include manual measurement, optical measurement and contact measurement. Although these methods can meet the measurement needs to a certain extent, they have many shortcomings in terms of accuracy, efficiency and reliability. With the development of industrial automation and intelligence, the requirements for measuring devices are getting higher and higher, and the existing measurement technology has been difficult to fully meet the needs of modern manufacturing.

[0003] In the related art, a Chinese invention patent with authorization announcement number CN112665484B discloses a combined shape and position measuring device for the inner wall size of a circular cylinder formed in a large container, including a support seat and a center rod fixedly connected to the upper side of the support seat. A plurality of telescopic parts for measuring the inner diameter of the cylinder are arranged circumferentially on the center rod. The telescopic parts include a fixed first telescopic rod and a sliding second telescopic rod, which are then connected one by one with a plurality of second telescopic rods through a plurality of connecting rods. The telescopic function of all telescopic parts is realized by the up and down movement of the sliding tube, thereby achieving the purpose of measuring the inner diameter of the cylinder. In addition, due to the unevenness of the inner wall of the cylinder, a support seat with an airbag is arranged at the bottom of the center rod, and the inflation of the airbag and the detection of a level meter are used to improve the measurement accuracy.

[0004] With regard to the above-mentioned related technologies, there are the following defects: under the linkage action of the sliding tube and the multiple connecting rods, the moving distances of the multiple second telescopic rods are the same. When the roundness at the same height position of the cylinder wall deviates, it is impossible to achieve the purpose of all the second telescopic rods reaching the cylinder wall, thereby achieving the purpose of accurate measurement; in addition, although the airbag has high adaptability, its stability is insufficient. In the actual measurement process, it is difficult to maintain balance at all times, and it is necessary to pay attention to the detection of the level meter frequently. There are inconveniences in the detection process, and there is still room for improvement. Summary of the invention

[0005] In order to improve the measurement accuracy and convenience, the present application provides a device and method for measuring the shape and position of the inner wall of a circular cylinder of a large container.

[0006] The present application provides a device and method for measuring the shape and position of the inner wall of a large-scale circular cylinder container, which adopts the following technical solutions: A device for measuring the size and shape of the inner wall of a large-scale circular cylinder, comprising: A base, the base is used to vertically place the cylinder, the base is rotatably connected to a rotating frame, a lifting mechanism is arranged at the rotating frame, the lifting mechanism extends to the inside of the cylinder, and the center line of the base, the rotation axis of the rotating frame and the axis of the cylinder coincide with each other; A measuring assembly is located inside the cylinder, and includes a horizontally arranged measuring rod and a sliding cylinder. The connecting end of the measuring rod is connected to the lifting mechanism, and the measuring end of the measuring rod slides with the sliding cylinder. An elastic member is provided between the sliding cylinder and the measuring rod, and the elastic member is used to drive the sliding cylinder to move toward the inner wall of the cylinder. The connecting end of the measuring rod is located at the axis of the cylinder, and the measuring end of the measuring rod is provided with a scale along its own length direction; the lifting mechanism is used to drive the measuring assembly to rise and fall.

[0007] By adopting the above technical scheme, the base is used as a bearing platform of the cylinder to maintain the stability of the cylinder, and the turntable on the base is used as a supporting member for the lifting mechanism and the measuring assembly, which can improve the stability of the measuring assembly and the lifting mechanism, and replace the support method using the bottom wall of the cylinder as the supporting surface, so that the measurement accuracy is not limited by the flatness of the bottom wall of the cylinder. In addition, the measuring assembly is put into position through the lifting mechanism, and combined with the rotation action of the turntable, the inner diameter at different positions at the same height can be measured. Through the cooperation of the measuring rod, the sliding cylinder and the elastic part, there is no need to manually adjust the elongation of the measuring assembly, which is conducive to improving the convenience and efficiency of measurement. Even if multiple measuring assemblies perform measurement work at the same time, they can achieve the purpose of not affecting each other, which is conducive to improving the measurement accuracy and convenience of the measuring device as a whole.

[0008] Preferably, the rotating frame includes an annular seat rotatably connected to the surface of the base, a plurality of columns symmetrically arranged on both sides of the annular seat, and a horizontal top plate arranged on top of the plurality of columns, and the lifting mechanism is arranged at the horizontal top plate.

[0009] By adopting the above technical solution, the annular seat serves as the bottom supporting member of the turntable, and the columns and horizontal plates constitute the supporting structure of the lifting mechanism. The load applied to the horizontal top plate by the lifting mechanism is evenly distributed to the annular seat through the columns on both sides, which is beneficial to improving the rotation stability of the turntable.

[0010] Preferably, a clamping mechanism is provided on the surface of the base, and the clamping mechanism is used to clamp and fix the cylinder.

[0011] By adopting the above technical solution, a clamping mechanism is arranged on the surface of the base, and the cylinder is clamped and fixed by the clamping mechanism, which is conducive to improving the stability of the cylinder during the measurement process.

[0012] Preferably, a working chamber for accommodating a clamping mechanism is provided inside the base, and the clamping mechanism includes two clamping blocks and a linkage assembly for driving the two clamping blocks to move closer to or away from each other. Two slide grooves connected to the working chamber are provided on the surface of the base, and the two slide grooves extend toward the center line direction of the base and correspond one-to-one to the two clamping blocks. The clamping blocks are slidably connected to the corresponding slide grooves and extend out of the slide grooves.

[0013] By adopting the above technical solution, under the drive of the linkage component, the two clamping blocks move synchronously towards each other, and the slide groove plays a guiding role, thereby finally achieving the purpose of clamping the cylinder, which is beneficial to improving the stability and clamping efficiency of the clamping mechanism.

[0014] Preferably, the linkage assembly includes a bidirectional screw rotatably connected to the inner wall of the working chamber and a working motor for driving the bidirectional screw to rotate, the two ends of the bidirectional screw respectively threadedly penetrate two clamping blocks; the base surface is provided with an auxiliary groove that is connected to the working chamber and extends in a direction perpendicular to the slide groove, a side screw parallel to the auxiliary groove is rotatably connected in the working chamber, the auxiliary groove is slidably connected with a limit block that cooperates with the thread of the side screw, the side screw and the bidirectional screw are perpendicular to each other, a first bevel gear is coaxially fixed to the middle part of the bidirectional screw, and a second bevel gear is coaxially fixed to the end part of the side screw, the first bevel gear and the second bevel gear are meshed for transmission, and when the clamping mechanism clamps the cylinder, the limit block abuts against the outer wall of the cylinder, and the axis of the cylinder coincides with the center line of the base.

[0015] By adopting the above technical scheme, the bidirectional screw rotates under the drive of the working motor, and the clamping blocks at both ends of the bidirectional screw are driven to move synchronously. At the same time, under the meshing transmission of the first bevel gear and the second bevel gear, the side screw rotates, and the limit block is driven to move synchronously. The cylinder is limited at three points by two clamping blocks and one limit block. When the clamping mechanism clamps the cylinder, the limit block abuts against the outer wall of the cylinder, and the axis of the cylinder coincides with the center line of the base, so that the axis of the cylinder coincides with the rotation axis of the rotating frame, which is beneficial to improve the measurement accuracy of the measuring component.

[0016] Preferably, the inner peripheral wall of the annular seat is provided with an inner gear ring, and the base is internally rotatably connected with a gear meshing with the inner gear ring and is provided with a vertical motor for driving the gear to rotate.

[0017] By adopting the above technical solution, the rotation of the rotating frame is realized under the drive of the vertical motor and the meshing transmission of the inner gear ring of the gear, which is conducive to improving the accuracy of the rotation of the rotating frame.

[0018] Preferably, a receiving cavity for receiving the elastic member is provided inside the sliding cylinder, and a spherical slider is rotatably connected to one end of the sliding cylinder facing the inner wall of the cylinder.

[0019] By adopting the above technical solution, the elastic member is accommodated in the accommodating cavity in the sliding cylinder, which is beneficial to improving the compactness of the measuring assembly. The spherical slider is rotatably connected at the end of the sliding cylinder, which is beneficial to reducing the wear of the cylinder body and the sliding cylinder.

[0020] A method for measuring the size, shape and position of the inner wall of a large-scale circular cylinder, using a device for measuring the size, shape and position of the inner wall of a large-scale circular cylinder, comprises the following steps: S1: The cylinder is placed vertically in the middle of the base, and the lifting mechanism drives the measuring assembly to move downward into the cylinder. The sliding cylinder of the measuring assembly is pressed against the inner wall of the cylinder under the elastic force of the elastic member, and the inner diameter of the cylinder is measured by the measuring rod of the measuring assembly; S2: Slowly rotate the rotating frame, observe the changes in the readings of the measuring rod and record them; S3: Start the lifting mechanism, adjust the height position of the measuring component, and measure the inner diameter of the cylinder at different heights.

[0021] By adopting the above technical solution, the measuring component is put into position through the lifting mechanism, and combined with the rotating action of the turntable, the measurement of the inner diameter at different positions at the same height can be realized. Through the cooperation of the measuring rod, the sliding cylinder and the elastic part, there is no need to manually adjust the elongation of the measuring component, which is beneficial to improving the convenience and efficiency of measurement. Even if multiple measuring components perform measurement work at the same time, the purpose of not affecting each other can be achieved. It is beneficial to improve the measurement accuracy and convenience of the measuring device as a whole.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The base is used as a bearing platform of the cylinder to keep the cylinder in a stable state. The rotating frame on the base is used as a supporting member for the lifting mechanism and the measuring assembly, which can improve the stability of the measuring assembly and the lifting mechanism, replacing the support method of using the bottom wall of the cylinder as the supporting surface, so that the measurement accuracy is not limited by the flatness of the bottom wall of the cylinder; 2. The measuring assembly is put into position by the lifting mechanism, and the inner diameter at different positions at the same height is measured in combination with the rotating action of the rotating frame. The cooperation of the measuring rod, the sliding cylinder and the elastic member does not require manual adjustment of the elongation of the measuring assembly, which is conducive to improving the convenience and efficiency of measurement. Even if multiple measuring assemblies are measuring at the same time, they can achieve the purpose of not affecting each other, which is conducive to improving the measurement accuracy and convenience of the measuring device as a whole; 3. The cylinder is limited at three points by two clamping blocks and a limit block. When the clamping mechanism clamps the cylinder, the limit block contacts the outer wall of the cylinder, and the axis of the cylinder coincides with the center line of the base, so that the axis of the cylinder coincides with the rotation axis of the rotating frame, which is beneficial to improve the measurement accuracy of the measuring assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a device for measuring the shape and position of the inner wall of a circular cylinder of a large container according to an embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of the internal structure of a device for measuring the shape and position of the inner wall of a circular cylinder of a large container according to an embodiment of the present application.

[0025] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0026] Figure 4 This is a schematic diagram of the position relationship between the bidirectional screw and the side screw in a device for measuring the shape and position of the inner wall of a large container circular cylinder in an embodiment of the present application. Explanation of the accompanying drawings: 1. base; 11. annular groove; 12. vertical motor; 13. gear; 14. slide groove; 15. auxiliary groove; 2. cylinder; 3. rotating frame; 31. annular seat; 32. column; 33. horizontal top plate; 34. inner ring gear; 4. lifting mechanism; 5. measuring assembly; 51. measuring rod; 52. sliding cylinder; 53. elastic member; 54. spherical slider; 55. accommodating chamber; 6. clamping mechanism; 61. linkage assembly; 611. working motor; 612. bidirectional screw; 613. first bevel gear; 62. clamping block; 7. side screw; 71. limit block; 72. second bevel gear; 8. working chamber. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-4 This application is described in further detail.

[0028] The present application discloses a device for measuring the size and position of the inner wall of a circular cylinder of a large container, referring to Figure 1 and Figure 2 , including a base 1 and a measuring assembly 5. Among them, the base 1 is in a truncated cone shape and is used to vertically place the cylinder 2. A rotating frame 3 is rotatably connected to the upper surface of the base 1. An annular groove 11 is provided on the upper surface of the base 1, and the rotating frame 3 includes an annular seat 31 rotatably connected to the annular groove 11, a plurality of columns 32 symmetrically fixed on both sides of the annular seat 31, and a horizontal top plate 33 installed on the top of the plurality of columns 32. The axis of rotation of the annular seat 31 coincides with the center line of the base 1. In this embodiment, an inner gear ring 34 is fixed to the inner circumferential wall of the annular seat 31, and a gear 13 meshing with the inner gear ring 34 is rotatably connected inside the base 1, and a vertical motor 12 is provided for driving the gear 13 to rotate. The vertical motor 12 is embedded in the base 1, and the output shaft of the vertical motor 12 is coaxially and fixedly connected to the gear 13. Under the drive of the vertical motor 12 and the meshing transmission of the gear 13 and the inner gear ring 34 , the rotating frame 3 is rotated, which is beneficial to improve the accuracy of the rotation of the rotating frame 3 .

[0029] A lifting mechanism 4 is installed in the middle of the horizontal top plate 33 of the rotating frame 3. The lifting mechanism 4 is specifically a conventional worm gear lifting machine. The worm of the lifting mechanism 4 extends vertically downward to the inside of the cylinder 2. When the cylinder 2 is placed in the middle of the surface of the base 1, the center line of the base 1, the rotation axis of the rotating frame 3, the axis of the worm and the axis of the cylinder 2 coincide.

[0030] Reference Figure 2 and Figure 3 , the measuring assembly 5 is installed at the lower end of the worm of the lifting mechanism 4 and extends to the inside of the cylinder 2. The number of measuring assemblies 5 can be increased according to actual needs. The lifting mechanism 4 is used to drive the measuring assembly 5 to rise and fall. Specifically, the measuring assembly 5 includes a measuring rod 51 horizontally fixed at the lower end of the worm of the lifting mechanism 4 and a sliding cylinder 52 used in conjunction with the measuring rod 51. The connecting end of the measuring rod 51 is fixedly connected to the worm of the lifting mechanism 4, and the measuring end of the measuring rod 51 is slidingly matched with the sliding cylinder 52. An elastic member 53 is installed between the sliding cylinder 52 and the measuring rod 51. The elastic member 53 is used to drive the sliding cylinder 52 to move toward the inner wall of the cylinder 2. The elastic member 53 is specifically a spring. The connecting end of the measuring rod 51 is located at the axis of the cylinder 2, and the measuring end of the measuring rod 51 is provided with a scale along its own length direction. In this embodiment, a receiving cavity 55 for receiving the elastic member 53 is provided inside the sliding cylinder 52. In addition, a ball-shaped slider 54 is provided at one end of the sliding cylinder 52 facing the inner wall of the cylinder body 2. The provision of the ball-shaped slider is conducive to reducing the wear of the cylinder body 2 and the sliding cylinder 52. Through the cooperation of the measuring rod 51, the sliding cylinder 52 and the elastic member 53, there is no need to manually adjust the elongation of the measuring component 5, which is conducive to improving the convenience and efficiency of measurement. Multiple measuring components 5 can perform measurement work at the same time without affecting each other.

[0031] Reference Figure 2 and Figure 4In this embodiment, a clamping mechanism 6 for clamping and fixing the cylinder 2 is installed on the surface of the base 1, and a working chamber 8 for accommodating the clamping mechanism 6 is arranged inside the base 1. Specifically, the clamping mechanism 6 includes two clamping blocks 62 and a linkage assembly 61 for driving the two clamping blocks 62 to move closer to or away from each other. Two slide grooves 14 connected to the working chamber 8 are opened on the surface of the base 1. The two slide grooves 14 extend toward the center line direction of the base 1 and correspond to the two clamping blocks 62 one by one. The extension lines of the two slide grooves 14 are located in the same straight line. The clamping block 62 is slidably connected to the corresponding slide groove 14 and extends out of the slide groove 14. The linkage assembly 61 includes a bidirectional screw 612 rotatably connected to the inner wall of the working chamber 8 and a working motor 611 for driving the bidirectional screw 612 to rotate. The working motor 611 is embedded in the base 1 and the output shaft is coaxially fixedly connected to the bidirectional screw 612. The length direction of the bidirectional screw 612 is consistent with the length direction of the slide groove 14. Both ends of the bidirectional screw 612 are threaded through the two clamping blocks 62 , and driven by the working motor 611 , the bidirectional screw 612 rotates to achieve the purpose of synchronous movement of the clamping blocks 62 at both ends of the bidirectional screw 612 .

[0032] In this embodiment, the surface of the base 1 is provided with an auxiliary groove 15 which is connected to the working chamber 8 and extends in a direction perpendicular to the slide groove 14, and the auxiliary groove 15 extends in the direction of the center line of the base 1. A side screw 7 parallel to the auxiliary groove 15 is rotatably connected in the working chamber 8, and a limit block 71 which is threadedly matched with the side screw 7 is slidably connected to the auxiliary groove 15. The limit block 71 and the two clamping blocks 62 are located at a concentric circle on the upper surface of the base 1. The side screw 7 and the bidirectional screw 612 are perpendicular to each other, and a first bevel gear 613 is coaxially fixed to the middle of the bidirectional screw 612, and a second bevel gear 7213 is coaxially fixed to the end of the side screw 7. The first bevel gear 613 is meshed with the second bevel gear 72 for transmission. When the clamping mechanism 6 clamps the cylinder 2, the limit block 71 abuts against the outer wall of the cylinder 2, and the axis of the cylinder 2 coincides with the center line of the base 1. Under the meshing transmission of the first bevel gear 613 and the second bevel gear 72, the side screw 7 rotates following the bidirectional screw 612, and at the same time drives the limit block 71 to move synchronously. The outer wall of the cylinder 2 is limited at three points by two clamping blocks 62 and one limit block 71, so that the axis of the cylinder 2 coincides with the central axis of the base 1, thereby making the axis of the cylinder 2 coincide with the rotation axis of the rotating frame 3, which is beneficial to improving the measurement accuracy of the measuring component 5.

[0033] The embodiment of the present application also discloses a method for measuring the shape and position of the inner wall of a large-scale circular cylinder, using a device for measuring the shape and position of the inner wall of a large-scale circular cylinder 2, including the following steps: S1: Place the cylinder 2 vertically in the middle of the base 1, start the working motor 611, and under the drive of the working motor 611 and the meshing transmission of the first bevel gear 613 and the second bevel gear 72, the bidirectional screw 612 and the side screw 7 rotate synchronously, thereby driving the limit block 71 and the two clamping blocks 62 to move toward the cylinder 2 and clamp the outer wall of the cylinder 2. The two clamping blocks 62 and the limit block 71 limit the outer wall of the cylinder 2 at three points, so that the axis of the cylinder 2 coincides with the central axis of the base 1, thereby making the axis of the cylinder 2 coincide with the rotation axis of the rotating frame 3.

[0034] Then, the lifting mechanism 4 is started to drive the measuring assembly 5 to move down to the inside of the cylinder 2. The sliding cylinder 52 of the measuring assembly 5 is pressed against the inner wall of the cylinder 2 under the elastic force of the elastic member 53, and the inner diameter of the cylinder 2 is measured by the measuring rod 51 of the measuring assembly 5. The staff can observe and record the reading of the measuring rod 51 through the camera installed on the lower surface of the horizontal top plate 33.

[0035] S2: Start the vertical motor 12 to drive the rotating frame 3 to rotate slowly, and the staff observes the reading change of the measuring rod 51 and records it.

[0036] S3: Start the lifting mechanism 4 to adjust the height position of the measuring component 5, so as to measure the inner diameters of the cylinder 2 at different heights.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for measuring the size and shape of the inner wall of a large-scale circular cylinder, characterized in that: include: A base (1), the base (1) being used to vertically place a cylinder (2), the base (1) being rotatably connected to a rotating frame (3), the rotating frame (3) being provided with a lifting mechanism (4), the lifting mechanism (4) extending into the cylinder (2), the center line of the base (1), the rotation axis of the rotating frame (3) and the axis of the cylinder (2) being coincident; A measuring assembly (5), wherein the measuring assembly (5) is located inside the cylinder (2), and comprises a horizontally arranged measuring rod (51) and a sliding cylinder (52); the connecting end of the measuring rod (51) is connected to a lifting mechanism (4), the measuring end of the measuring rod (51) is slidingly matched with the sliding cylinder (52), an elastic member (53) is arranged between the sliding cylinder (52) and the measuring rod (51), and the elastic member (53) is used to drive the sliding cylinder (52) to move toward the inner wall of the cylinder (2); the connecting end of the measuring rod (51) is located at the axis of the cylinder (2), and the measuring end of the measuring rod (51) is provided with a scale along its own length direction; the lifting mechanism (4) is used to drive the measuring assembly (5) to rise and fall.

2. The device for measuring the inner wall dimensions and position of a circular cylinder of a large container according to claim 1, characterized in that: The rotating frame (3) comprises an annular seat (31) rotatably connected to the surface of the base (1), a plurality of columns (32) symmetrically arranged on both sides of the annular seat (31), and a horizontal top plate (33) arranged on top of the plurality of columns (32), and the lifting mechanism (4) is arranged on the horizontal top plate (33).

3. The device for measuring the inner wall dimensions and position of a circular cylinder of a large container according to claim 1, characterized in that: A clamping mechanism (6) is provided on the surface of the base (1), and the clamping mechanism (6) is used to clamp and fix the cylinder (2).

4. The device for measuring the inner wall dimensions and position of a circular cylinder of a large container according to claim 3, characterized in that: The base (1) is provided with a working chamber (8) for accommodating a clamping mechanism (6), the clamping mechanism (6) comprising two clamping blocks (62) and a linkage assembly (61) for driving the two clamping blocks (62) to move toward or away from each other, the surface of the base (1) is provided with two slide grooves (14) connected to the working chamber (8), the two slide grooves (14) both extend in the direction of the center line of the base (1) and correspond one to one with the two clamping blocks (62), the clamping blocks (62) are slidably connected to the corresponding slide grooves (14) and extend out of the slide grooves (14).

5. The device for measuring the inner wall dimensions and position of a circular cylinder of a large container according to claim 4, characterized in that: The linkage assembly (61) comprises a bidirectional screw (612) rotatably connected to the inner wall of the working chamber (8) and a working motor (611) for driving the bidirectional screw (612) to rotate, and the two ends of the bidirectional screw (612) are respectively threaded through the two clamping blocks (62); the surface of the base (1) is provided with an auxiliary groove (15) which is connected to the working chamber (8) and extends in a direction perpendicular to the slide groove (14); a side screw (7) parallel to the auxiliary groove (15) is rotatably connected in the working chamber (8), and the auxiliary groove (15) is slidably connected to A limit block (71) is threadably matched with the side screw (7); the side screw (7) and the bidirectional screw (612) are perpendicular to each other; a first bevel gear (613) is coaxially fixed to the middle of the bidirectional screw (612); a second bevel gear (72) is coaxially fixed to the end of the side screw (7); the first bevel gear (613) and the second bevel gear (72) are meshed for transmission; when the clamping mechanism (6) clamps the cylinder (2), the limit block (71) abuts against the outer wall of the cylinder (2), and the axis of the cylinder (2) coincides with the center line of the base (1).

6. The device for measuring the inner wall dimensions and position of a circular cylinder of a large container according to claim 2, characterized in that: The inner peripheral wall of the annular seat (31) is provided with an inner gear ring (34), and the base (1) is internally rotatably connected with a gear (13) meshing with the inner gear ring (34) and is provided with a vertical motor (12) for driving the gear (13) to rotate.

7. The device for measuring the inner wall dimensions and position of a circular cylinder of a large container according to claim 1, characterized in that: The sliding cylinder (52) is provided with a receiving cavity (55) for receiving the elastic member (53) therein, and one end of the sliding cylinder (52) facing the inner wall of the cylinder body (2) is rotatably connected to a ball-shaped sliding block (54).

8. A method for measuring the shape and position of the inner wall of a large-scale circular cylinder, using a device for measuring the shape and position of the inner wall of a large-scale circular cylinder as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The cylinder (2) is vertically placed in the middle of the base (1), and the lifting mechanism (4) drives the measuring assembly (5) to move downward into the cylinder (2). The sliding cylinder (52) of the measuring assembly (5) is pressed against the inner wall of the cylinder (2) under the elastic force of the elastic member (53), and the inner diameter of the cylinder (2) is measured by the measuring rod (51) of the measuring assembly (5); S2: Slowly rotate the rotating frame (3), observe and record the reading change of the measuring rod (51); S3: Start the lifting mechanism (4), adjust the height position of the measuring component (5), and measure the inner diameter of the cylinder (2) at different heights.

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