Vacuum container joint positioning tool and positioning method

Abstract

According to the vacuum container connector positioning tool and method, the positioning tool comprises a supporting assembly and a positioning assembly, the supporting assembly comprises a circular pipe and a circular ring, the circular pipe is hinged to supporting rods, the circular ring is hinged to inner supporting rods, and the number of the supporting rods and the number of the inner supporting rods are both at least three; the positioning assembly comprises a rotating shaft penetrating through the circular tube; the mandrel coaxially penetrates through the rotating shaft, a rectangular frame is arranged at the upper end of the mandrel, and a second cone frustum is arranged at the lower end of the mandrel; the front end of the extension rod is provided with a barrier strip and a screw rod; the positioning block penetrates through the extension rod; the pressing block is of a conical structure and is coaxially connected with the screw, and the conical top faces the mandrel. The positioning method is achieved through the vacuum container connector positioning tool and comprises the following steps that S1, the supporting assembly is fixed; s2, adjusting a positioning assembly; s3, mounting a joint; and S4, locking. According to the scheme, the mounting position precision of the connector on the vacuum container barrel can be effectively improved, and the stability of the position of the connector in the welding process is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum container joint connection positioning tools, and in particular relates to a vacuum container joint positioning tool and a positioning method. Background Art

[0002] In some electrical high voltage test experiments, it is often necessary to conduct them in a vacuum environment. Currently, the following methods are usually used: Figure 1 The experiment was carried out in the vacuum container shown in the figure, which includes a cylindrical body and KF40 connectors, D50 connectors, D80 connectors and charging components passed through the side wall of the body. The 40, 50 and 80 in the connector numbers represent the outer diameters of the connectors. Such connectors are usually passed through pre-machined through holes in the side wall of the body and then fixedly connected by welding. When in use, the outer end of the connector is usually connected to a relatively fixed hard pipe.

[0003] In order to facilitate the installation of the joint, the inner diameter of the through hole processed on the cylinder is usually larger than the outer diameter of the corresponding joint, which makes it difficult to accurately position the joint during assembly and welding. As a result, the joint is usually crooked after welding, which reduces the position accuracy of the joint and affects the connection between the joint and the external hard pipe. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a vacuum container joint positioning tool and positioning method, which can effectively improve the installation position accuracy of the joint on the vacuum container cylinder and ensure the stability of the joint position during the welding process.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed: A vacuum container joint positioning tool, comprising: a support component and a positioning component The support assembly includes a circular tube and a circular ring coaxially sleeved on the outside of the circular tube, a support rod is hinged at the lower end of the circular tube, an inner support rod is hinged at the outer side of the circular ring, the end of the inner support rod is hinged at the middle section of the support rod, the support rod and the inner support rod are both inclined toward the upper side of the outer side of the circular tube, and at least three groups of support rods and inner support rods are arranged along the circumference array, and the hinge axes of the support rods and the inner support rods are perpendicular to the circular tube; The positioning assembly includes a rotating shaft, a core shaft, an extension rod, a positioning block and a pressing block; The rotating shaft is coaxially rotatable and penetrates the circular tube, and the rotating shaft is movably arranged along the axis. A circular hole is coaxially opened at the lower end of the rotating shaft, and a rectangular hole connected to the top of the circular hole is coaxially opened at the upper end. A strip hole extending in the axial direction is opened on the side wall of the rotating shaft corresponding to the circular hole, and friction strips are arranged in each of the strip holes. A first truncated cone is fixedly arranged at the upper end of the circular hole, and its conical surface faces downward. The mandrel is coaxially arranged in the circular hole and coaxially passes through the first truncated cone. A rectangular frame is arranged at the upper end of the mandrel, and the extension direction of the opening of the mandrel is perpendicular to the rotating shaft. The rectangular frame is arranged in the rectangular hole. A second truncated cone is arranged at the lower end of the mandrel, and the conical surface of the second truncated cone faces upward. The friction strip is located between the first truncated cone and the second truncated cone. The extension rod has a polygonal cross section. The extension rod vertically passes through the upper end of the rotating shaft and the rectangular frame. The top of the rectangular frame is provided with a locking screw parallel to the core axis. The front end of the extension rod is provided with a baffle. The center line of the baffle intersects the axis of the extension rod vertically, and the baffle is parallel to the core axis. The front end of the extension rod is provided with a screw rod extending forward coaxially. The positioning block is a conical structure, which is coaxially arranged on the extension rod, and the screw rod passes through the cone top of the positioning block. A rectangular groove for accommodating the stop bar is opened at one end of the cone top of the positioning block. A support spring is sleeved on the extension rod, which is located between the positioning block and the core shaft and is in a compressed state. The pressing block is a conical structure, which is coaxially connected to the screw, and the top of the cone faces the core shaft.

[0006] A vacuum container joint positioning method is implemented using the above-mentioned vacuum container joint positioning tooling, and the method includes the following steps: S1: fixing the support component; S2: adjusting the positioning component; S3: installing the joint; S4: locking.

[0007] The beneficial effects of the present invention are: it can effectively improve the installation position accuracy of the joint on the vacuum container cylinder and ensure the stability of the joint position during welding; the rotating shaft and the extension rod are locked and fixed with the same locking screw, which can effectively improve the convenience of operation; the rotating shaft can rotate around the circle and move along the axis, and can adapt to the positioning and fixation of joints in different positions under the premise of fixing the support assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0009] Figure 1 A schematic structural diagram of a vacuum container is shown.

[0010] Figure 2 The overall structural diagram of the present invention is shown.

[0011] Figure 3 A schematic diagram of the structure of a circular tube and a circular ring is shown.

[0012] Figure 4 An exploded view of the positioning assembly is shown.

[0013] Figure 5 The schematic diagram of the state of the present invention when the positioning block is connected to the through hole is shown.

[0014] Figure 6 A cross-sectional view of the present invention is shown when the positioning block is connected to the through hole.

[0015] Figure 7 A schematic diagram of the state of the present invention during the installation of the joint is shown.

[0016] Figure 8 A cross-sectional view of the present invention is shown during installation of the joint.

[0017] Fig. 9 The schematic diagram of the state of the present invention when locked is shown.

[0018] Fig.10 A cross-sectional view of the present invention is shown when locked.

[0019] Markings in the figure: round tube -1, support rod -11, knife plate -12, cover plate -13, screw rod -14, gear -141, inner gear ring -15, ring -2, inner support rod -21, rotating shaft -3, round hole -301, rectangular hole -302, strip hole -303, friction strip -31, first frustum -32, core shaft -4, rectangular frame -41, second frustum -42, locking screw -43, extension rod -5, baffle bar -51, screw rod -52, positioning block -6, rectangular groove -61, support spring -62, pressure block -7. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Embodiment 1, as Figures 2 to 4 As shown, a vacuum container joint positioning tool includes: a supporting component and a positioning component.

[0022] like Figure 2 , Figure 3As shown, the support assembly includes a circular tube 1 and a circular ring 2 coaxially sleeved on the outside of the circular tube 1, a support rod 11 is hinged at the lower end of the circular tube 1, an inner support rod 21 is hinged on the outer side of the circular ring 2, and the end of the inner support rod 21 is hinged to the middle section of the support rod 11, the support rod 11 and the inner support rod 21 are both inclined toward the upper side of the outer side of the circular tube 1, and the support rod 11 and the inner support rod 21 are both provided with at least three groups along the circumferential array, and the hinge axes of the support rod 11 and the inner support rod 21 are perpendicular to the circular tube 1. The circular ring 2 is moved along the axial direction to adjust the angle between the support rod 11 and the axis of the circular tube 1, so as to achieve the purpose of adjusting the distance between the end of the support rod 11 and the axis of the circular tube 1, because the support rod 11 and the inner support rod 21 are provided with at least three groups along the circumferential array, and the connection structure of each group is the same, and the distance between the end of all the support rods 11 and the axis of the circular tube 1 is equal, which can also be understood as the center of the circular contour surrounded by the ends of all the support rods 11 is located on the axis of the circular tube 1.

[0023] As a preferred solution, a flange may be provided at the lower end of the circular tube 1, and the support rod 11 may be hinged to the flange.

[0024] As a preferred solution, a linear motor or a cylinder can be arranged on the side wall of the circular tube 1 to drive the circular ring 2 to move along the axis, or the linear motor or the cylinder can be arranged on the flange at the lower end of the circular tube 1; like Figures 2 to 4 As shown, the positioning assembly includes a rotating shaft 3, a core shaft 4, an extension rod 5, a positioning block 6 and a pressing block 7.

[0025] Specifically, the rotating shaft 3 is coaxially rotatably arranged in the round tube 1, and the rotating shaft is arranged to move along the axis. After the support assembly is fixed, the positioning assembly can position the joints of different installation heights of the container cylinder by moving the rotating shaft 3 along the axis, and can adapt to the positioning work of the joints at different angles of the cylinder by rotating the rotating shaft 3. Figure 4 , Figure 8 and Fig.10 As shown, a circular hole 301 is coaxially formed at the lower end of the rotating shaft 3, a rectangular hole 302 connected to the top of the circular hole 301 is coaxially formed at the upper end, a strip hole 303 extending in the axial direction is formed on the side wall of the rotating shaft 3 corresponding to the circular hole 301, a friction strip 31 is provided in each of the strip holes 303, and a first frustum 32 is fixedly provided at the upper end of the circular hole 301, with the conical surface facing downward.

[0026] Specifically, Figure 4 , Figure 8 and Fig.10As shown, the mandrel 4 is coaxially arranged in the circular hole 301 and coaxially passes through the first circular truncated cone 32. The upper end of the mandrel 4 is provided with a rectangular frame 41, the extension direction of which is perpendicular to the rotating shaft 3. The rectangular frame 41 is arranged in the rectangular hole 302. The lower end of the mandrel 4 is provided with a second circular truncated cone 42, the conical surface of which faces upward, and the friction strip 31 is located between the first circular truncated cone 32 and the second circular truncated cone 42. When the mandrel 4 is moved upward, the friction strip 31 can be pushed upward by the conical surface of the second circular truncated cone 42. When the upper end of the friction strip 31 and the conical surface of the first circular truncated cone 32 are squeezed, the conical surfaces of the first circular truncated cone 32 and the second circular truncated cone 42 can be used to simultaneously push the friction strip 31 to move toward the outside of the rotating shaft 3 along the strip hole 303, and then the outer edge of the friction strip 31 abuts against the inner wall of the circular tube 1, thereby fixing the rotating shaft 3 in the circular tube 1 to prevent the rotating shaft 3 from rotating and moving along the axis.

[0027] Specifically, Figure 4 , Figure 8 and Fig.10 As shown, the cross section of the extension rod 5 is polygonal, preferably rectangular or hexagonal. The extension rod 5 vertically passes through the upper end of the rotating shaft 3 and the rectangular frame 41. The top of the rectangular frame 41 is provided with a locking screw 43 parallel to the core shaft 4. When in use, the locking screw 43 is screwed downward to first make the lower end of the locking screw 43 abut against the top surface of the extension rod 5. Continuing to screw the locking screw 43 downward will move the core shaft 4 upward, thereby achieving the purpose of pushing the friction strip 31 outward and at the same time achieving the purpose of pressing the extension rod 5. The front end of the extension rod 5 is provided with a stop bar 51, the midline of the stop bar 51 intersects the axis of the extension rod 5 vertically, and the stop bar 51 is parallel to the core shaft 4. The front end of the extension rod 5 is provided with a coaxial screw 52 extending forward.

[0028] Specifically, Figure 2 , Figure 4 As shown, the positioning block 6 is a conical structure, which is coaxially arranged on the extension rod 5, and the top of the cone faces the front end of the screw 52. The screw 52 passes through the top of the cone of the positioning block 6. One end of the top of the cone of the positioning block 6 is provided with a rectangular groove 61 for accommodating the baffle 51. A support spring 62 is sleeved on the extension rod 5, which is located between the positioning block 6 and the core shaft 4 and is in a compressed state.

[0029] Specifically, Figure 2 , Figure 4 As shown, the pressing block 7 is a conical structure, which is coaxially connected to the screw 52 , and the top of the cone faces the core shaft 4 .

[0030] Preferably, Figure 2As shown, the ends of the support rods 11 are hinged with blades 12, the axis of the hinge is perpendicular to the length direction of the tube 1 and the blade 12, and the cross section of the end of the blade 12 facing the outside of the tube 1 is an arc or sharp angle structure, so as to improve the position accuracy when the outside of the blade 12 abuts against the inner wall of the container cylinder. Figures 5 to 10 As shown, when the support rod 11 is stretched outward, the outer side of the blade 12 contacts the inner wall of the container cylinder, and the length direction of the blade 12 will be consistent with the length direction of the cylinder. Moreover, because the blade 12 is a hinged mounting structure, it can adapt to cylinders of different inner diameters and can always maintain a state of fitting with the length direction of the inner wall of the cylinder, thereby improving the accuracy and stability of the positioning of the support assembly in the cylinder.

[0031] Preferably, Figure 3 As shown, a cover plate 13 of an annular structure is connected to the top of the circular tube 1 by screws to prevent the circular ring 2 from falling off from the upper end of the circular tube 1. Because the support rod 11 is hinged to the lower end of the circular tube 1, it can serve as a blocking structure to prevent the circular ring 2 from falling off from the lower end of the circular tube 1.

[0032] Further preferably, Figure 3 As shown, the cover plate 13 is provided with at least two screw rods 14 parallel to the circular tube 1 along the circumferential array, and the screw rods 14 all pass through the circular ring 2 by means of threaded cooperation. As long as the screw rods 14 are rotated at the same time, the circular ring 2 can be driven to move along the axis, and the stability of the circular ring 2 during movement and the coaxial state with the circular tube 1 can be ensured to prevent the circular ring 2 from deflecting, thereby ensuring that the unfolding angle of each support rod 11 is consistent. This transmission method also has a self-locking function to prevent the circular ring 2 from moving along the axis by itself. The upper end of the screw rod 14 is provided with a gear 141, and an inner gear ring 15 is coaxially provided on the outside of the circular tube 1. The gears 141 are all meshed with the inside of the inner gear ring 15. By rotating the inner gear ring 15, all the screw rods 14 can be driven to rotate at the same time.

[0033] As a preferred solution, the inner gear ring 15 is used as a tool and is connected to the gear 141 only when in use. It can be removed when not in use. Before disassembly, the positioning assembly needs to be removed from the supporting assembly, that is, the rotating shaft 3 needs to be pulled out from the circular tube 1.

[0034] As another preferred solution, a light hole is coaxially provided at the lower end of the inner gear ring 15, and the light hole is rotatably sleeved on the outside of the cover plate 13, so that the inner gear ring 15 can be always connected with the gear 141 and rotate more stably.

[0035] Preferably, the length of the rotating shaft 3 and the friction strip 31 are both greater than the length of the circular tube 1, so that the positioning component has a larger adjustment range along the axial direction of the circular tube 1, so that after the support component is fixed, the working range of the positioning component can be expanded by moving the rotating shaft 3 along the axis.

[0036] Preferably, Figure 8 , Fig.10 As shown, both ends of the friction strip 31 are inclined surfaces facing the middle of the shaft 3, respectively cooperating with the conical surfaces of the first truncated cone 32 and the second truncated cone 42 to improve the guidance and smoothness when the friction strip 31 is pushed outward.

[0037] Preferably, Figure 4 As shown, the cross-section of the end of the baffle 51 facing outward is sharp or arc-shaped, and the apex of the sharp angle or the center of the arc is located on the axis of the extension rod 5, so that a line contact can be formed between the baffle 51 and the inner wall of the cylinder, and the trajectory of the line contact will be in the middle of the through hole on the cylinder for installing the joint, preventing the position of the extension rod 5 from shifting and preventing the joint from protruding from the inside of the cylinder when positioning.

[0038] Embodiment 2, a vacuum container joint positioning method, is implemented using the vacuum container joint positioning tooling recorded in Embodiment 1, and the method comprises the following steps: S1: Fix the support assembly, put the support assembly or the vacuum container joint positioning tooling as a whole into the container cylinder, make the round tube 1 and the cylinder tend to be parallel, move the ring 2 axially, make the support rod 11 open outward, until the ends of the support rod 11 are pressed against the inner wall of the cylinder, at this time, the round tube 1 will remain coaxial with the cylinder, and use the friction between the support rod 11 and the inner wall of the cylinder to fix the support assembly inside the cylinder. If this step only places the support assembly in the cylinder, then after fixing the support assembly, it is necessary to insert the shaft 3 into the round tube 1, so as to complete the assembly of the positioning assembly and the support assembly, and during assembly, it is necessary to pull the extension rod 5 backward so that the shaft 3 is in the middle position of the extension rod 5, so as to facilitate the processing of the extension rod 5 into the cylinder, from which it can be known that the overall length of the extension rod 5 and the screw 52 is less than the inner diameter of the cylinder, and when the extension rod 5 is pulled backward, the support spring 62 will be compressed, and after the positioning assembly is installed, the extension rod 5 can be released, and the front end of the screw 52 will abut against the inner wall of the cylinder. Similarly, when the vacuum container joint positioning tool is placed as a whole into the container cylinder, the extension rod 5 may be pulled backwards so that the rotating shaft 3 is located in the middle position of the extension rod 5.

[0039] S2: Adjust the positioning assembly, by rotating and moving the shaft 3 along the axis, the position of the extension rod 5 is adjusted, including the position along the height direction of the cylinder and the angular position around the cylinder. During this process, the front end of the screw 52 will slide on the inner wall of the cylinder, such as Figure 5 , Figure 6 As shown, the screw rod 52 is inserted into the through hole of the joint to be assembled on the barrel. Under the action of the support spring 62, the conical top of the positioning block 6 will be inserted into the through hole, and the conical surface of the positioning block 6 will cooperate with the edge of the through hole. Through the cooperation process between the two, the position of the extension rod 5 is corrected, so that the extension rod 5 and the through hole are in a coaxial state.

[0040] S3: Install the connector, such as Figures 7 to 10 As shown, the joint is sleeved on the outside of the screw 52 and inserted into the through hole from the outside of the cylinder. The pressing block 7 is screwed onto the screw 52 so that the conical surface of the pressing block 7 fits with the inner edge of the outer end of the joint. The conical surface of the pressing block 7 fits with the edge of the joint so that the joint and the pressing block 7 can be coaxial. The pressing block 7 is rotated to push the joint into the cylinder until the inner edge of the other end of the joint fits with the conical surface of the positioning block 6 and the end face abuts against the stop bar 51. The specific process is as follows: Figure 8 As shown, first, Figure 7 , Figure 8 As shown, the stop bar 51 will fit with the inner wall of the cylinder, and under the action of the support spring 62, the cone top of the positioning block 6 is always inserted in the through hole, so the other end of the joint will fit with the conical surface of the positioning block 6, so that the two ends of the joint are coaxial with the pressing block 7 and the positioning block 6 respectively, so that the joint and the extension rod 5 are in a coaxial state; then continue to rotate the pressing block 7, the pressing block 7 and the joint will move toward the stop bar 51 at the same time, in this process the joint will push the positioning block 6 to move toward the rotating shaft 3, and the support spring 62 will be further compressed, as shown in FIG. Fig. 9 , Fig.10 As shown, until the joint contacts the conical surface of the positioning block 6 and the baffle 51 at the same time, the joint is now coaxial with the through hole, and the portion where the inner end face of the joint contacts the baffle 51 is just flush with the inner wall of the cylinder, thereby preventing the joint from protruding from the inside of the cylinder. Although the position of the joint has been determined at this time, there is still a risk of movement during welding.

[0041] S4: Lock, such as Fig.10 As shown, the locking screw 43 is turned downward to move the core shaft 4 upward, and the friction strip 31 is pushed outward and pressed against the inner wall of the circular tube 1 through the second circular cone 42 and the first circular cone 32, so that the rotating shaft 3 is fixed inside the circular tube 1, so that the positioning assembly and the supporting assembly are connected as a whole, and the locking screw 43 presses the extension rod 5 against the rotating shaft 3 at the same time, so that the positioning and fixing of the joint are completed, and then the welding process can be carried out at the connection between the outer wall of the cylinder and the joint. The scheme of the present invention arranges the main structures inside the cylinder, and the joint is exposed as a whole on the outer wall of the cylinder, avoiding the obstruction of the welding part and facilitating welding from the peripheral side of the joint; the present invention tilts the support rod 11 toward the upper side of the outer side of the circular tube 1, and the extension rod 5 is also arranged above the circular tube 1, so that the part where the end of the support rod 11 contacts the cylinder is closer to the part where the joint is positioned along the axial direction of the cylinder, so that the present scheme is suitable for cylinders with smaller lengths.

[0042] The above description is only a preferred embodiment of the present invention, and is not intended to be the only one or to limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A vacuum container joint positioning tool, characterized in that: include: A support assembly, comprising a circular tube (1) and a circular ring (2) coaxially sleeved on the outside of the circular tube (1), a support rod (11) being hingedly connected to the lower end of the circular tube (1), an inner support rod (21) being hingedly connected to the outer side of the circular ring (2), a distal end of the inner support rod (21) being hingedly connected to the middle section of the support rod (11), the support rod (11) and the inner support rod (21) both being inclined upwardly toward the outer side of the circular tube (1), the support rod (11) and the inner support rod (21) being arranged in at least three groups along a circumferential array, and the hinge axes of the support rod (11) and the inner support rod (21) being perpendicular to the circular tube (1); A positioning assembly, comprising a rotating shaft (3), a core shaft (4), an extension rod (5), a positioning block (6) and a pressing block (7); The rotating shaft (3) is coaxially rotatably arranged in the circular tube (1), and the rotating shaft is arranged to move along the axis. A circular hole (301) is coaxially opened at the lower end of the rotating shaft (3), and a rectangular hole (302) communicating with the top of the circular hole (301) is coaxially opened at the upper end. A strip hole (303) extending in the axial direction is opened on the side wall of the rotating shaft (3) corresponding to the circular hole (301), and a friction strip (31) is arranged in each of the strip holes (303). A first truncated cone (32) is fixedly arranged at the upper end of the circular hole (301), and the conical surface of the first truncated cone faces downward. The core shaft (4) is coaxially inserted into the circular hole (301) and coaxially passes through the first truncated cone (32). A rectangular frame (41) is provided at the upper end of the core shaft (4), and the extension direction of the opening of the rectangular frame (41) is perpendicular to the rotating shaft (3). The rectangular frame (41) is inserted into the rectangular hole (302). A second truncated cone (42) is provided at the lower end of the core shaft (4), and the conical surface of the second truncated cone faces upward. The friction strip (31) is located between the first truncated cone (32) and the second truncated cone (42). The extension rod (5) has a polygonal cross section. The extension rod (5) vertically passes through the upper end of the rotating shaft (3) and the rectangular frame (41). A locking screw (43) parallel to the core shaft (4) is provided on the top of the rectangular frame (41). A retaining bar (51) is provided at the front end of the extension rod (5). The center line of the retaining bar (51) intersects the axis of the extension rod (5) vertically, and the retaining bar (51) is parallel to the core shaft (4). A screw rod (52) extending coaxially forward is provided at the front end of the extension rod (5). The positioning block (6) is a conical structure and is coaxially arranged on the extension rod (5). The screw rod (52) passes through the top of the cone of the positioning block (6). One end of the top of the cone of the positioning block (6) is provided with a rectangular groove (61) for accommodating the stop bar (51). The extension rod (5) is sleeved with a support spring (62) which is located between the positioning block (6) and the core shaft (4) and is in a compressed state. The pressing block (7) is a conical structure, which is coaxially connected to the screw rod (52), and the top of the cone faces the core shaft (4).

2. The vacuum container joint positioning tool according to claim 1, characterized in that: The ends of the support rods (11) are hinged with knife plates (12), the hinge axis is perpendicular to the length direction of the circular tube (1) and the knife plates (12), and the cross section of the end of the knife plates (12) facing the outside of the circular tube (1) is an arc-shaped or sharp-angled structure.

3. The vacuum container joint positioning tool according to claim 1, characterized in that: A cover plate (13) with an annular structure is connected to the top of the circular tube (1) by means of screws.

4. The vacuum container joint positioning tool according to claim 2, characterized in that: At least two screw rods (14) parallel to the circular tube (1) are arranged in a circumferential array through the cover plate (13), and the screw rods (14) are all threaded through the circular ring (2), and gears (141) are provided at the upper ends of the screw rods (14). An inner gear ring (15) is coaxially provided on the outside of the circular tube (1), and the gears (141) are all meshed with the inside of the inner gear ring (15).

5. The vacuum container joint positioning tool according to claim 1, characterized in that: The lengths of the rotating shaft (3) and the friction strip (31) are both greater than the length of the circular tube (1).

6. The vacuum container joint positioning tool according to claim 1, characterized in that: The two ends of the friction strip (31) are inclined surfaces facing one side of the middle of the rotating shaft (3) and respectively cooperate with the conical surfaces of the first truncated cone (32) and the second truncated cone (42).

7. The vacuum container joint positioning tool according to claim 1, characterized in that: The cross section of one end of the blocking strip (51) facing outward is sharp-angled or arc-shaped, and the vertex of the sharp angle or the center of the arc is located on the axis of the extension rod (5).

8. A method for positioning a vacuum container joint, characterized in that: The method is implemented by using the vacuum container joint positioning tool described in any one of claims 1 to 7, and comprises the following steps: S1: Fix the support assembly, place the support assembly or the vacuum container joint positioning tooling as a whole into the container cylinder, make the circular tube (1) parallel to the cylinder, move the circular ring (2) axially, make the support rod (11) open outward, until the ends of the support rod (11) are pressed tightly against the inner wall of the cylinder; S2: Adjust the positioning assembly, adjust the position of the extension rod (5) by rotating and moving the rotating shaft (3) along the axis, insert the screw rod (52) into the through hole of the joint to be assembled on the cylinder, and under the action of the supporting spring (62), the cone top of the positioning block (6) will be inserted into the through hole; S3: Install the joint, put the joint on the outside of the screw (52), and insert it into the through hole from the outside of the cylinder, screw the pressing block (7) onto the screw (52), make the conical surface of the pressing block (7) fit with the inner edge of the outer end of the joint, rotate the pressing block (7) to push the joint into the cylinder until the inner edge of the other end of the joint fits with the conical surface of the positioning block (6), and the end face abuts against the stop bar (51); S4: Locking: Turn the locking screw (43) downward to move the core shaft (4) upward, and push the friction strip (31) outward to press against the inner wall of the round tube (1) through the second truncated cone (42) and the first truncated cone (32). The locking screw (43) simultaneously presses the extension rod (5) against the rotating shaft (3).

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