Cylinder external welding positioning tool

Abstract

The invention provides a cylinder external welding positioning tool, and belongs to the technical field of cylinder welding. The cylinder external welding positioning tool comprises a machine base and a support, the support is fixedly installed on the surface of the machine base, a supporting column is rotatably installed in an inner cavity of the support, a positioning mechanism is installed on the surface of the machine base and comprises a rotating shaft, a first fixing sleeve and a second fixing sleeve, the rotating shaft is rotatably installed on the surface of the machine base, and a fixing base is rotatably installed at one end of the rotating shaft; the fixing base is clamped in an inner cavity of the supporting column. By arranging the positioning mechanism, a rotating shaft is driven to rotate through a first motor, so that a third fixing sleeve is driven to move towards a sleeve shaft through a threaded groove, an inner supporting plate is pushed to move towards the outer side through a second supporting rod, the inner supporting plate is tightly attached to the inner wall of the cylinder, and supporting and positioning of the inner wall of the cylinder are achieved; and then the electric telescopic rod drives the clamping block to clamp the surface of the cylinder, so that axial positioning of the cylinder can be achieved, deviation of the cylinder during angle adjustment is avoided, and the welding quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinder welding, and more particularly to a welding positioning tooling for the outside of a cylinder. Background Art

[0002] As an indispensable auxiliary tool in the welding process, the welding positioning tooling for the outside of a cylinder plays a crucial role in ensuring welding quality, improving work efficiency, and reducing the labor intensity of operators. It is mainly used to provide precise positioning, clamping, and necessary support for workpieces during the welding process, ensuring that the welding operation can be successfully completed according to the design requirements. For cylindrical workpieces, it is usually necessary to ensure that the outside of the cylinder is stably fixed during welding, so that the welding operation can be accurately carried out at the predetermined position, ensuring that the cylinder does not shift or deform during the welding process, thereby improving the welding quality and production efficiency. In practical applications, the welding positioning tooling for the outside of a cylinder is widely used in various industrial fields, especially in industries such as pressure vessels, chemical equipment, pipeline engineering, shipbuilding, and automobile manufacturing, where the welding requirements for cylindrical workpieces are particularly prominent.

[0003] The existing welding positioning tooling for the outside of a cylinder generally places the bent and rolled cylinder on a support frame and drives the support frame to rotate through a driving device to weld the periphery of the cylinder. During the rotation of the cylinder, longitudinal positioning of the cylinder cannot be carried out, easily causing the cylinder to shift and affecting the welding quality. Summary of the Invention

[0004] To make up for the above deficiencies, the present invention provides a welding positioning tooling for the outside of a cylinder that overcomes the above technical problems or at least partially solves the above problems.

[0005] The present invention is implemented as follows: The present invention provides a welding positioning tooling for the outside of a cylinder, including a machine base and a support. The support is fixedly installed on the surface of the machine base. A support column is rotatably installed in the inner cavity of the support. A positioning mechanism is installed on the surface of the machine base for positioning the cylinder. The positioning mechanism includes: A rotating shaft, the rotating shaft is rotatably installed on the surface of the machine base. A sleeve shaft is rotatably sleeved on the surface of the rotating shaft, and the sleeve shaft is rotatably installed on the surface of the machine base; A first fixed sleeve, the first fixed sleeve is symmetrically and fixedly installed on the surface of the sleeve shaft. First support rods are symmetrically and rotatably installed on the surface of the first fixed sleeve. The other ends of the first support rods are rotatably installed with inner support plates for supporting the inner wall of the cylinder; The second fixing sleeve is fixedly installed on the surface of the sleeve shaft. Symmetrically fixed on the surface of the second fixing sleeve are sleeve rods. A positioning rod is slidably installed in the inner cavity of the sleeve rod. The positioning rod is fixedly connected to the inner support plate. A positioning plate is fixedly installed on the inner wall of the positioning rod for longitudinally positioning the cylinder.

[0006] In a preferred solution, one end of the rotating shaft is rotatably installed with a fixed seat. The fixed seat is clamped in the inner cavity of the support column. A positioning pin is inserted between the fixed seat and the support column. A first motor is fixedly installed on the surface of the machine base. The output end of the first motor is fixedly connected to the other end of the rotating shaft for driving the rotation of the rotating shaft.

[0007] In a preferred solution, a first gear is fixedly installed on the surface of the sleeve shaft. A second motor is fixedly installed on the surface of the machine base. The output end of the second motor is fixedly installed with a second gear. The second gear meshes with the first gear.

[0008] In a preferred solution, a third fixing sleeve is sleeved on the surface of the rotating shaft. A second support rod is rotatably installed between the third fixing sleeve and the inner support plate for supporting the movement of the inner support plate. A threaded block is fixedly installed in the inner cavity of the third fixing sleeve. A threaded groove is formed on the surface of the rotating shaft. The threaded groove is threadedly connected to the threaded block.

[0009] In a preferred solution, an electric telescopic rod is fixedly installed on the surface of the positioning rod. The telescopic end of the electric telescopic rod is fixedly installed with a clamping block for clamping and fixing the cylinder.

[0010] By setting the positioning mechanism, the first motor drives the rotation of the rotating shaft, thereby driving the third fixing sleeve to move towards the sleeve shaft through the threaded groove, and pushing the inner support plate to move outwards through the second support rod, so that the inner support plate is closely attached to the inner wall of the cylinder, realizing the support and positioning of the inner wall of the cylinder. Subsequently, the clamping block is driven by the electric telescopic rod to clamp on the surface of the cylinder, and the axial positioning of the cylinder can be realized, avoiding deviation when adjusting the angle of the cylinder and ensuring the welding quality.

[0011] In a preferred solution, a connecting mechanism is installed on the surface of the machine base for connecting adjacent inner support plates. The connecting mechanism includes a driving cavity and an arc plate. Driving cavities are symmetrically formed in the inner cavity of the inner support plate. An arc plate is slidably installed in the driving cavities of adjacent inner support plates. Limit plates are fixedly installed on both sides of the arc plate for limiting the arc plate.

[0012] In a preferred embodiment, the surface of the arc-shaped plate is provided with an empty groove, and an elastic airbag is installed on the surface of the empty groove for supporting the inner wall of the cylinder. An air chamber is provided in the inner cavity of the sleeve shaft for supplying air to the empty groove. A piston is slidably installed in the air chamber. A rotating ring is rotatably installed on the side wall of the third fixed sleeve. Symmetrically fixed connecting rods are installed between the rotating ring and the piston for driving the piston to move in the air chamber.

[0013] In a preferred embodiment, a plurality of air supply holes are provided on the side wall of the arc-shaped plate, and the air supply holes communicate with the empty groove. A channel is provided in the inner cavity of the inner support plate, and the channel communicates with the driving chamber. A trachea is connected between the channel and the air chamber.

[0014] By setting the connection mechanism, when the third fixed sleeve is driven by the first motor to move towards the sleeve shaft and the inner support plate is closely attached to the inner wall of the cylinder, the piston is synchronously pushed to move in the air chamber through the connecting rod. The air in the air chamber is injected into the driving chamber through the channel and then into the empty groove through the air supply holes. Then the elastic airbag expands and closely adheres to the inner wall of the cylinder to support it, increasing the support area of the cylinder and ensuring the roundness of the cylinder.

[0015] In a preferred embodiment, a compensation mechanism is installed on the surface of the machine base for secondary support of the cylinder. The compensation mechanism includes a temperature sensing plate and a temperature sensor. The temperature sensing plate is installed on the surface of the inner support plate for transmitting temperature, and a temperature sensor is installed at the bottom of the temperature sensing plate.

[0016] In a preferred embodiment, an air pump is fixedly installed on the surface of the sleeve shaft. A trachea is connected between the air outlet end of the air pump and the air chamber. A pressure sensor is installed in the air chamber for detecting the air pressure in the air chamber, and a pressure relief valve is installed on the side wall of the air chamber.

[0017] By setting the compensation mechanism, the heat generated during the welding of the cylinder is transmitted to the temperature sensor through the temperature sensing plate, thereby controlling the operation of the air pump to supply air to the air chamber, causing the elastic airbag to continue to expand and providing secondary support to the inner wall of the cylinder. This can offset the deformation of the cylinder caused by thermal expansion force to a certain extent, adapt to the deformation caused by the expansion of the cylinder, and maintain the roundness of the cylinder.

[0018] A welding positioning tooling for the outside of a cylinder provided by the present invention has the following beneficial effects: 1. By setting the positioning mechanism, the first motor drives the rotation of the rotating shaft, thereby driving the third fixed sleeve to move towards the sleeve shaft through the thread groove, and pushing the inner support plate to move outward through the second support rod, so that the inner support plate closely adheres to the inner wall of the cylinder to realize the support and positioning of the inner wall of the cylinder. Subsequently, the clamping block is driven by the electric telescopic rod to clamp on the surface of the cylinder, and the axial positioning of the cylinder can be realized, avoiding deviation during the angle adjustment of the cylinder and ensuring the welding quality.

[0019] 2. By setting up a connecting mechanism, when the first motor drives the third fixed sleeve to move towards the sleeve shaft and the inner support plate presses tightly against the inner wall of the cylinder, the piston is synchronously pushed to move in the air chamber through the connecting rod. The air in the air chamber is injected into the driving chamber through the channel and then into the empty groove through the air supply hole. Then, the elastic airbag expands and presses tightly against the inner wall of the cylinder to support it, increasing the supporting area of the cylinder and ensuring the roundness of the cylinder.

[0020] 3. By setting up a compensation mechanism, the heat generated during the welding of the cylinder is transferred to the temperature sensor through the temperature sensing plate, thereby controlling the operation of the air pump to supply air to the air chamber, causing the elastic airbag to continue to expand and providing secondary support to the inner wall of the cylinder. This can, to a certain extent, offset the deformation of the cylinder caused by the thermal expansion force to adapt to the deformation brought about by the expansion of the cylinder and maintain the roundness of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. Figure 1 It is a front perspective view provided by the embodiment of the present invention; Figure 2 It is a rear perspective view provided by the embodiment of the present invention; Figure 3 It is a side view provided by the embodiment of the present invention; Figure 4 It is a front view provided by the embodiment of the present invention; Figure 5 It is a side sectional view provided by the embodiment of the present invention; Figure 6 It is a sectional view of the sleeve rod provided by the embodiment of the present invention; Figure 7 It is a sectional view of the inner support plate provided by the embodiment of the present invention; Figure 8 It is a sectional view of the sleeve shaft provided by the embodiment of the present invention; Figure 9 It is a sectional view of the arc-shaped plate provided by the embodiment of the present invention; Figure 10 It is a partial exploded view provided by the embodiment of the present invention.

[0022] In the figure: 1, machine base; 2, support; 3, support column; 4, positioning mechanism; 401, rotating shaft; 402, fixed seat; 403, positioning pin; 404, first motor; 405, sleeve shaft; 406, first gear; 407, second motor; 408, second gear; 409, first fixed sleeve; 410, first support rod; 411, inner support plate; 412, third fixed sleeve; 413, second support rod; 414, threaded block; 415, threaded groove; 416, second fixed sleeve; 417, sleeve rod; 418, positioning rod; 419, positioning plate; 420, electric telescopic rod; 421, clamping block; 5, connecting mechanism; 501, drive cavity; 502, arc plate; 503, limiting plate; 504, empty groove; 505, elastic airbag; 506, air cavity; 507, piston; 508, rotating ring; 509, connecting rod; 510, air supply hole; 511, channel; 6, compensation mechanism; 601, temperature sensing plate; 602, temperature sensor; 603, air pump; 604, air pressure sensor; 605, pressure relief valve. Detailed implementation mode

[0023] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] Refer to Figures 1 - 10 As shown, the present invention provides a technical solution: a welding positioning tool for the outside of a cylinder, including a machine base 1 and a support 2. The support 2 is fixedly installed on the surface of the machine base 1. A support column 3 is rotatably installed in the inner cavity of the support 2 to support the rotating shaft 401, thereby maintaining the stability of the rotating shaft 401. A positioning mechanism 4 is installed on the surface of the machine base 1 to position the cylinder. The positioning mechanism 4 includes a rotating shaft 401, a first fixed sleeve 409 and a second fixed sleeve 416. The rotating shaft 401 is rotatably installed on the surface of the machine base 1. One end of the rotating shaft 401 is rotatably installed with a fixed seat 402. The fixed seat 402 is clamped in the inner cavity of the support column 3. A positioning pin 403 is inserted between the fixed seat 402 and the support column 3. A first motor 404 is fixedly installed on the surface of the machine base 1. The output end of the first motor 404 is fixedly connected to the other end of the rotating shaft 401 to drive the rotating shaft 401 to rotate.

[0025] Refer to Figures 1 - 8As shown, in a preferred embodiment, a sleeve shaft 405 is rotatably sleeved on the surface of a rotating shaft 401. The sleeve shaft 405 is rotatably installed on the surface of a machine base 1. A first gear 406 is fixedly installed on the surface of the sleeve shaft 405. A second motor 407 is fixedly installed on the surface of the machine base 1. A second gear 408 is fixedly installed at the output end of the second motor 407. The second gear 408 meshes with the first gear 406. By driving the second gear 408 to rotate through the second motor 407, the first gear 406 and the sleeve shaft 405 can be driven to rotate, so as to perform angle adjustment. First fixing sleeves 409 are symmetrically and fixedly installed on the surface of the sleeve shaft 405. First support rods 410 are symmetrically and rotatably installed on the surface of the first fixing sleeves 409. The other ends of the first support rods 410 are rotatably installed with inner support plates 411 for supporting the inner wall of the cylinder. A third fixing sleeve 412 is sleeved on the surface of the rotating shaft 401. A second support rod 413 is rotatably installed between the third fixing sleeve 412 and the inner support plate 411 for supporting the movement of the inner support plate 411. A threaded block 414 is fixedly installed in the inner cavity of the third fixing sleeve 412. A threaded groove 415 is formed on the surface of the rotating shaft 401. The threaded groove 415 is in threaded connection with the threaded block 414. By driving the rotating shaft 401 to rotate through the first motor 404, the third fixing sleeve 412 can be driven to move towards the sleeve shaft 405 through the threaded groove 415, and the inner support plate 411 can be pushed to move outwards through the second support rod 413, so as to realize the support for the inner wall of the cylinder.

[0026] Referring to Figures 1 - 8 As shown, in a preferred embodiment, a second fixing sleeve 416 is fixedly installed on the surface of the sleeve shaft 405. Sleeve rods 417 are symmetrically and fixedly installed on the surface of the second fixing sleeve 416. A positioning rod 418 is slidably installed in the inner cavity of the sleeve rod 417. The positioning rod 418 is fixedly connected with the inner support plate 411. A positioning plate 419 is fixedly installed on the inner wall of the positioning rod 418 for longitudinally positioning the cylinder. An electric telescopic rod 420 is fixedly installed on the surface of the positioning rod 418. A clamping block 421 is fixedly installed at the telescopic end of the electric telescopic rod 420 for clamping and fixing the cylinder. During use, the bent and coiled cylinder is sleeved on the surface of the inner support plate 411, one end of the cylinder is abutted against the side wall of the positioning plate 419, and the clamping block 421 is driven by the electric telescopic rod 420 to clamp on the surface of the cylinder, so as to realize the axial positioning of the cylinder, avoid deviation during the angle adjustment of the cylinder, and ensure the welding quality.

[0027] In a preferred embodiment, during use, the positioning pin 403 is pulled out and the support column 3 is lowered. Then, the curled cylinder can be sleeved on the surface of the inner support plate 411, and one end of the cylinder is abutted against the side wall of the positioning plate 419. Subsequently, the fixed seat 402 is inserted into the support column 3 again to ensure the stability of the rotating shaft 401. The rotating shaft 401 is driven to rotate by the first motor 404, so that the third fixed sleeve 412 is driven to move towards the sleeve shaft 405 through the thread groove 415, and the inner support plate 411 is pushed to move outwards by the second support rod 413, making the inner support plate 411 closely attached to the inner wall of the cylinder, realizing the support and positioning of the inner wall of the cylinder. Subsequently, the clamping block 421 is driven by the electric telescopic rod 420 to clamp on the surface of the cylinder, achieving the axial positioning of the cylinder, avoiding deviation during the angle adjustment of the cylinder, and ensuring the welding quality.

[0028] Referring to Figures 1 - 10 As shown, in a preferred embodiment, a connecting mechanism 5 is installed on the surface of the machine base 1 for connecting adjacent inner support plates 411. When the inner support plate 411 is used to support a large-diameter cylinder, the inner support plate 411 moves outwards, resulting in a gap between adjacent inner support plates 411, thereby reducing the contact area between the cylinder and the inner support plate 411. This situation may affect the stability of the support and have an adverse effect on the roundness of the cylinder. The inner support plate 411 mainly provides support force through contact with the cylinder. If the number of support points decreases, especially if the gap between adjacent inner support plates 411 is too large, the cylinder may not have sufficient uniform support, which may lead to excessive local stress and cause deformation of the cylinder. The connecting mechanism 5 includes a driving cavity 501 and an arc-shaped plate 502. Driving cavities 501 are symmetrically opened in the inner cavity of the inner support plate 411, and arc-shaped plates 502 are slidably installed in the driving cavities 501 of adjacent inner support plates 411. Limiting plates 503 are fixedly installed on both sides of the arc-shaped plate 502 for limiting the arc-shaped plate 502.

[0029] Referring to Figures 1 - 10 As shown, in a preferred embodiment, an empty groove 504 is opened on the surface of the arc-shaped plate 502, and an elastic airbag 505 is installed on the surface of the empty groove 504 for supporting the inner wall of the cylinder. By expanding, the contact area with the inner wall of the cylinder is increased, thereby enhancing the support force. An air cavity 506 is opened in the inner cavity of the sleeve shaft 405 for supplying air to the empty groove 504. A piston 507 is slidably installed in the air cavity 506. A rotating ring 508 is rotatably installed on the side wall of the third fixed sleeve 412. Connecting rods 509 are symmetrically fixedly installed between the rotating ring 508 and the piston 507 for driving the piston 507 to move in the air cavity 506. A plurality of air supply holes 510 are opened on the side wall of the arc-shaped plate 502, and the air supply holes 510 are communicated with the empty groove 504. A channel 511 is opened in the inner cavity of the inner support plate 411, and the channel 511 is communicated with the driving cavity 501. A trachea is connected between the channel 511 and the air cavity 506.

[0030] In a preferred embodiment, when the third fixed sleeve 412 is driven by the first motor 404 to move towards the sleeve shaft 405 and the inner support plate 411 is pressed against the inner wall of the cylinder, the piston 507 is synchronously pushed to move in the air chamber 506 through the connecting rod 509. The air in the air chamber 506 is injected into the driving chamber 501 through the channel 511 and then into the empty groove 504 through the air supply hole 510. Then, the elastic airbag 505 expands and presses against the inner wall of the cylinder to support it, increasing the support area of the cylinder and ensuring the roundness of the cylinder.

[0031] Referring Figures 1 - 10 As shown, in a preferred embodiment, a compensation mechanism 6 is installed on the surface of the machine base 1 for secondary support of the cylinder. During the welding process of the cylinder, it will expand with the increase of temperature, resulting in an increase in the diameter and length of the cylinder, thus affecting the roundness of the cylinder. The compensation mechanism 6 includes a temperature sensing plate 601 and a temperature sensor 602. The temperature sensing plate 601 is installed on the surface of the inner support plate 411 for transmitting temperature. A temperature sensor 602 is installed at the bottom of the temperature sensing plate 601 for detecting the temperature of the cylinder surface. An air pump 603 is fixedly installed on the surface of the sleeve shaft 405. A trachea is connected between the air outlet end of the air pump 603 and the air chamber 506 for injecting air into the air chamber 506. A pressure sensor 604 is installed in the air chamber 506 for detecting the air pressure in the air chamber 506. A pressure relief valve 605 is installed on the side wall of the air chamber 506 for exhausting air. When the temperature of the cylinder rises, the air pump 603 continues to inject air into the elastic airbag 505, causing the elastic airbag 505 to continue to expand and providing secondary support to the inner wall of the cylinder. This can offset the deformation caused by the thermal expansion force of the cylinder to a certain extent, adapt to the deformation caused by the expansion of the cylinder, and maintain the roundness of the cylinder.

[0032] In a preferred embodiment, during use, the weld of the cylinder is placed on the surface of the temperature sensing plate 601. The heat generated during the welding of the cylinder is transmitted to the temperature sensor 602 through the temperature sensing plate 601, thereby controlling the operation of the air pump 603 to supply air to the air chamber 506, causing the elastic airbag 505 to continue to expand and providing secondary support to the inner wall of the cylinder. This can offset the deformation caused by the thermal expansion force of the cylinder to a certain extent, adapt to the deformation caused by the expansion of the cylinder, and maintain the roundness of the cylinder.

[0033] Specifically, the working principle of this positioning tooling for welding on the outside of a cylinder is as follows: During use, pull out the positioning pin 403 and lower the support column 3. Then, the bent and coiled cylinder can be sleeved on the surface of the inner support plate 411, and one end of the cylinder is abutted against the side wall of the positioning plate 419. Subsequently, insert the fixed seat 402 back into the support column 3 to ensure the stability of the rotating shaft 401. Drive the rotating shaft 401 to rotate through the first motor 404, thereby driving the third fixed sleeve 412 to move towards the sleeve shaft 405 through the threaded groove 415, and pushing the inner support plate 411 to move outwards through the second support rod 413, so that the inner support plate 411 closely adheres to the inner wall of the cylinder, realizing the support and positioning of the inner wall of the cylinder. Subsequently, drive the clamping block 421 to clamp on the surface of the cylinder through the electric telescopic rod 420, and the axial positioning of the cylinder can be achieved, avoiding deviation during the angle adjustment of the cylinder and ensuring the welding quality.

[0034] When the first motor 404 drives the third fixed sleeve 412 to move towards the sleeve shaft 405 and the inner support plate 411 closely adheres to the inner wall of the cylinder, the piston 507 is synchronously pushed to move in the air chamber 506 through the connecting rod 509. The air in the air chamber 506 is injected into the driving chamber 501 through the channel 511 and injected into the empty groove 504 through the air supply hole 510. Then, the elastic airbag 505 expands and closely adheres to the inner wall of the cylinder to support it, increasing the support area of the cylinder and ensuring the roundness of the cylinder.

[0035] Place the weld of the cylinder on the surface of the temperature sensing plate 601. The heat generated during the welding of the cylinder is transferred to the temperature sensor 602 through the temperature sensing plate 601, thereby controlling the operation of the air pump 603 to supply air to the air chamber 506, causing the elastic airbag 505 to continue to expand, and providing secondary support to the inner wall of the cylinder. This can, to a certain extent, offset the deformation of the cylinder caused by the thermal expansion force, adapt to the deformation brought about by the expansion of the cylinder, and maintain the roundness of the cylinder.

[0036] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A welding positioning tool for the outside of a cylinder, comprising a machine base (1) and a support (2), the support (2) is fixedly installed on the surface of the machine base (1), and a support column (3) is rotatably installed in the inner cavity of the support (2), characterized in that, A positioning mechanism (4) is mounted on the surface of the machine base (1) for positioning the cylinder. The positioning mechanism (4) includes: A rotating shaft (401) rotatably mounted on the surface of the machine base (1). A sleeve shaft (405) is rotatably sleeved on the surface of the rotating shaft (401), and the sleeve shaft (405) is rotatably mounted on the surface of the machine base (1); A first fixing sleeve (409) symmetrically fixed on the surface of the sleeve shaft (405). First support rods (410) are symmetrically and rotatably mounted on the surface of the first fixing sleeve (409). The other ends of the first support rods (410) are rotatably mounted with inner support plates (411) for supporting the inner wall of the cylinder; A second fixing sleeve (416) fixed on the surface of the sleeve shaft (405). Sleeve rods (417) are symmetrically fixed on the surface of the second fixing sleeve (416). A positioning rod (418) is slidably mounted in the inner cavity of the sleeve rod (417). The positioning rod (418) is fixedly connected with the inner support plate (411). A positioning plate (419) is fixedly mounted on the inner wall of the positioning rod (418) for longitudinally positioning the cylinder.

2. The positioning tool for external welding of a cylinder according to claim 1, wherein, One end of the rotating shaft (401) is rotatably mounted with a fixing seat (402). The fixing seat (402) is clamped in the inner cavity of the support column (3). A positioning pin (403) is inserted between the fixing seat (402) and the support column (3). A first motor (404) is fixedly mounted on the surface of the machine base (1). The output end of the first motor (404) is fixedly connected with the other end of the rotating shaft (401) for driving the rotating shaft (401) to rotate.

3. The positioning tool for external welding of a cylinder according to claim 1, wherein A first gear (406) is fixedly mounted on the surface of the sleeve shaft (405). A second motor (407) is fixedly mounted on the surface of the machine base (1). The output end of the second motor (407) is fixedly mounted with a second gear (408). The second gear (408) meshes with the first gear (406).

4. A welding positioning tooling for the outside of a cylinder according to claim 1, characterized in that, A third fixing sleeve (412) is sleeved on the surface of the rotating shaft (401). A second support rod (413) is rotatably mounted between the third fixing sleeve (412) and the inner support plate (411) for supporting the movement of the inner support plate (411). A threaded block (414) is fixedly mounted in the inner cavity of the third fixing sleeve (412). A threaded groove (415) is formed on the surface of the rotating shaft (401). The threaded groove (415) is in threaded connection with the threaded block (414).

5. The positioning tooling for external welding of a cylinder according to claim 1, wherein An electric telescopic rod (420) is fixedly mounted on the surface of the positioning rod (418). The telescopic end of the electric telescopic rod (420) is fixedly mounted with a clamping block (421) for clamping and fixing the cylinder.

6. The positioning tool for external welding of a cylinder according to claim 4, wherein A connecting mechanism (5) is mounted on the surface of the base (1) for connecting adjacent inner support plates (411). The connecting mechanism (5) includes a driving cavity (501) and an arc-shaped plate (502). Driving cavities (501) are symmetrically formed in the inner cavity of the inner support plate (411). An arc-shaped plate (502) is slidably mounted in the driving cavities (501) of adjacent inner support plates (411). Limiting plates (503) are fixedly mounted on both sides of the arc-shaped plate (502) for limiting the arc-shaped plate (502).

7. A positioning tool for external welding of a cylinder according to claim 6, characterized in that, An empty groove (504) is formed on the surface of the arc-shaped plate (502). An elastic airbag (505) is mounted on the surface of the empty groove (504) for supporting the inner wall of the cylinder. An air cavity (506) is formed in the inner cavity of the sleeve shaft (405) for supplying air to the empty groove (504). A piston (507) is slidably mounted in the air cavity (506). A rotating ring (508) is rotatably mounted on the side wall of the third fixed sleeve (412). Link rods (509) are symmetrically and fixedly mounted between the rotating ring (508) and the piston (507) for driving the piston (507) to move in the air cavity (506).

8. A welding positioning tooling for the outside of a cylinder according to claim 7, characterized in that A plurality of air supply holes (510) are formed in the side wall of the arc-shaped plate (502). The air supply holes (510) communicate with the empty groove (504). A channel (511) is formed in the inner cavity of the inner support plate (411). The channel (511) communicates with the driving cavity (501). A trachea is connected between the channel (511) and the air cavity (506).

9. A welding positioning tool for the outside of a cylinder according to claim 8, characterized in that, A compensation mechanism (6) is mounted on the surface of the base (1) for secondarily supporting the cylinder. The compensation mechanism (6) includes a temperature sensing plate (601) and a temperature sensor (602). The temperature sensing plate (601) is mounted on the surface of the inner support plate (411) for transmitting temperature. A temperature sensor (602) is mounted at the bottom of the temperature sensing plate (601).

10. A positioning tool for external welding of a cylinder according to claim 9, characterized in that, An air pump (603) is fixedly mounted on the surface of the sleeve shaft (405). A trachea is connected between the air outlet end of the air pump (603) and the air cavity (506). A pressure sensor (604) is mounted in the air cavity (506) for detecting the air pressure in the air cavity (506). A pressure relief valve (605) is mounted on the side wall of the air cavity (506).

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