Turning inner support tool

Abstract

The turning inner support tool comprises a main shaft, a middle end supporting part and an end supporting part are arranged on the main shaft, the middle end supporting part comprises an inner support body arranged in the middle of the main shaft, the end supporting part comprises end inner supports connected to the two ends of the main shaft in a sleeving mode, and a plurality of channels are formed in the outer side face of the inner support body; a bearing steel ball is placed in the channel, the outer side of the channel is covered with a ball frame, the ball frame is used for limiting the bearing steel ball in the channel, a supporting block is arranged on the outer side of the end inner support and connected with the side wall of the outer ring of the end inner support through a telescopic assembly, and in the placing process, the bearing steel ball in the channel of the inner support body makes sliding contact with the inner wall of the thin-walled tube; the friction force between the inner supporting body and the inner wall of the thin-walled tube in the placing process can be reduced, the bearing steel balls of the inner supporting body in the thin-walled tube make contact with the inner wall of the thin-walled tube in a multi-point mode, the thin wall is supported, the situation that the thin wall is locally subjected to cutting force to generate sunken or elliptical deformation is avoided, and the turning machining precision of the thin-walled tube can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of turning processing for pipe fitting production, and specifically relates to a turning inner support tool. Background Art

[0002] Turning is the process of turning the rotating workpiece with a turning tool by rotating the workpiece. In the production process of pipe fittings, thin-walled round tubes need to be turned according to the process requirements. The problem encountered in the actual processing process is that thin-walled round tubes have poor rigidity due to their thin walls. When the tool applies cutting force to the round tube, the thin tube wall will be deformed due to the force. Therefore, it is necessary to support the thin wall of the round tube when turning the thin-walled round tube. Summary of the invention

[0003] The present application proposes a turning inner support tooling, which can be used to support the thin-walled inner side of a round tube during the turning process of the thin-walled round tube, thereby preventing the thin-walled round tube from deforming during the turning process and improving the turning accuracy.

[0004] To achieve the above objectives, this application provides the following technical solutions: A turning inner support tool comprises a main shaft, on which a middle-end support part and an end-head support part are respectively arranged, the middle-end support part comprises an inner support body arranged in the middle of the main shaft, the end-head support part comprises an end-head inner support respectively sleeved on the two ends of the main shaft, a plurality of grooves are provided on the outer side surface of the inner support body, bearing steel balls are placed in the grooves, a ball rack is provided on the outer side cover of the grooves, the ball rack is used to limit the bearing steel balls in the grooves, a support block is provided on the outer side of the end-head inner support, and the support block is connected to the outer ring side wall of the end-head inner support through a telescopic assembly.

[0005] In one embodiment of the present application, a slot is provided on the fixing block, a first through hole is provided at one end of the inner support body, the first through hole is used to be plugged with a first fixing bolt, and a first threaded hole is provided on the side wall of the main shaft.

[0006] In one embodiment of the present application, a second threaded hole is provided between the grooves, the ball rack is formed by splicing a plurality of perforated plates, and a second through hole is provided on the perforated plates.

[0007] In one embodiment of the present application, an outer side wall of the main shaft is provided with a shoulder.

[0008] In one embodiment of the present application, a third threaded hole is formed at one end of the end support, and a top screw is fitted in the third threaded hole.

[0009] In one embodiment of the present application, end surfaces at both ends of the main shaft are provided with threaded sleeves, and a lifting ring assembly is connected inside the threaded sleeves.

[0010] In one embodiment of the present application, the threaded sleeve is cooperatively connected with the threaded pull rod.

[0011] In one embodiment of the present application, a support sleeve is provided at one end of the threaded pull rod, and a support flange is provided at one side of the support sleeve.

[0012] In one embodiment of the present application, the telescopic assembly includes a support ring, a ring surface of the support ring is provided with a fourth threaded hole, an adjusting bolt is fitted in the fourth threaded hole, a rotating cavity is provided on one side of the support block, a rotating head is provided at one end of the adjusting bolt, and the rotating head is socketed with the rotating cavity.

[0013] In one embodiment of the present application, a gasket is adhered to the outer surface of the support block.

[0014] In summary, the technical solution proposed in the present application includes the following beneficial technical effects: the present application inserts the main shaft into the thin-walled tube, and during the insertion process, the bearing steel balls in the groove of the inner support body slide in contact with the inner wall of the thin-walled tube, which can reduce the friction between the inner support body and the inner wall of the thin-walled tube during the insertion process, which is beneficial to improving the smoothness of placing the inner support body into the thin-walled tube. The bearing steel balls of the inner support body in the thin-walled tube contact the inner wall of the thin-walled tube at multiple points and support the thin wall, thereby dispersing the cutting force exerted on the thin wall to the circumferential direction of the thin-walled tube to avoid local deformation of the thin wall caused by the cutting force and produce concavity or elliptical deformation, which is beneficial to improving the turning processing accuracy of the thin-walled tube. By pressing the support block against the inner wall of the thin-walled tube, the thin-walled tube can be driven to rotate when the main shaft rotates. During turning, the two ends of the main shaft can be clamped on the lathe to drive the thin-walled tube to rotate so that the thin-walled tube can be turned. Compared with directly clamping and turning the thin-walled tube, when the traditional three-jaw chuck is clamped, the thin-walled tube will be squeezed or partially dented when it is clamped. Clamping the main shaft to drive the thin-walled tube to rotate can prevent the thin-walled tube body from being deformed by clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of a three-dimensional structure in which a turning inner support tool provided in an embodiment of the present application is placed in a thin-walled tube; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA; Figure 3A schematic diagram of the structure of a turning inner support tooling provided in one embodiment of the present application; Figure 4 A schematic diagram of the inner support body structure of a turning inner support tooling provided in one embodiment of the present application; Figure 5 A schematic diagram of the structure of the inner support body ball rack of the turning inner support tooling provided in one embodiment of the present application; Figure 6 A schematic diagram of a partial cross-sectional structure of an inner support body of a turning inner support tool provided in one embodiment of the present application; Figure 7 A schematic diagram of the main shaft structure of a turning inner support tooling provided in one embodiment of the present application; Figure 8 A schematic diagram of the inner support ring assembly structure of a turning inner support tooling provided in one embodiment of the present application; Fig. 9 A schematic diagram of the structure of a support block and an adjusting bolt of a turning inner support tooling provided in one embodiment of the present application; In the picture: thin-walled tube-100; Spindle-1, shoulder-11, threaded sleeve-12; Lifting ring assembly-121, threaded tie rod-122; Inner support body-2, groove-21, first through hole-22; A first fixing bolt-221, a first threaded hole-222, and a second threaded hole-23; Bearing steel ball-211, ball carrier-212, orifice plate-213, second through hole-214; End support -3; Support block-31, third threaded hole-32; Top screw-321, support ring-33; Fourth threaded hole-331, adjusting bolt-332, rotating head-333; Rotating cavity - 311; Support sleeve-4; Support flange-41. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0018] It should be noted that in the description of the present application, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0019] The terms "installed", "connected" and "connected" in this application should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0020] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0021] This embodiment provides a turning inner support tool, see Figure 1-Figure 8 As shown, it includes a main shaft 1, on which a middle-end support portion and an end support portion are respectively arranged, the middle-end support portion includes an inner support body 2 arranged in the middle of the main shaft 1, and the end support portion includes an end inner support 3 respectively sleeved on the two ends of the main shaft 1, and the outer side surface of the inner support body 2 is provided with a plurality of grooves 21, and bearing steel balls 211 are placed in the grooves 21. A ball rack 212 is provided on the outer side cover of the groove 21, and the ball rack 212 is used to limit the bearing steel balls 211 in the groove 21, and a support block 31 is provided on the outer side of the end inner support 3, and the support block 31 is connected to the outer ring side of the end inner support 3 through a telescopic component.

[0022] In the above embodiment, the tooling includes a main shaft 1, on which a middle end support portion and an end support portion are respectively provided. Figure 3 As shown, the middle end support portion includes an inner support body 2 connected to the middle of the main shaft 1, and the end support portion includes an end inner support 3 respectively sleeved on both ends of the main shaft 1, wherein the inner support body 2 is used to support the middle end of the thin-walled tube 100, and the end inner support 3 is used to support both ends of the thin-walled tube 100. Further, as Figure 4As shown, a through hole is provided in the middle of the inner support body 2 for plugging with the main shaft 1, and a plurality of grooves 21 are evenly provided on the outer side of the inner support body 2. The grooves 21 are used to place bearing steel balls 211, and a ball rack 212 is provided on the outer side of the groove 21. The ball rack 212 is used to limit the bearing steel balls 211 in the groove 21. The ball rack 212 clamps the bearing steel balls 211 in the gap between the ball rack 212 and the groove 21, so that the bearing steel balls 211 can rotate in the gap between the groove 21 and the ball rack 212, and part of the arc end surface of the bearing steel balls 211 leaks out of the ball rack 212. A support block 31 is provided on the outer side of the end inner support 3, as shown in FIG. Figure 8 As shown, a through hole is provided on the outer side of the end inner support 3 for plugging and fixing with the main shaft 1, and the support block 31 is connected to the outer ring side of the end inner support 3 through a telescopic component, and the support block 31 abuts against the inner wall of the thin-walled tube 100. In actual use, Figure 2 As shown, by inserting the main shaft 1 into the thin-walled tube 100, during the insertion process, the bearing steel balls 211 in the groove 21 of the inner support body 2 slide in contact with the inner wall of the thin-walled tube 100, which can reduce the friction between the inner support body 2 and the inner wall of the thin-walled tube 100 during the insertion process, which is beneficial to improving the smoothness of the inner support body 2 being placed into the thin-walled tube 100. The bearing steel balls 211 of the inner support body 2 in the thin-walled tube 100 contact the inner wall of the thin-walled tube 100 at multiple points and support the thin wall, thereby dispersing the cutting force exerted on the thin wall to the circumferential direction of the thin-walled tube 100 to avoid local deformation of the thin wall caused by the cutting force and resulting in concavity or elliptical deformation, which is beneficial to improving the turning processing accuracy of the thin-walled tube 100. In addition, a support block 31 is provided on the outside of the end inner support 3, and the support block 31 is connected to the outer wall of the end inner support 3 through a telescopic component. When the spindle 1 is placed in the thin-walled tube 100, the telescopic component can be shortened to increase the distance between the support block 31 and the thin wall, so that the spindle 1 is inserted into the thin-walled tube 100. After insertion, the telescopic component is adjusted to extend so that the support block 31 is tightly connected to the inner wall of the thin-walled tube 100. The support block 31 is tightly pressed against the inner wall of the thin-walled tube 100, so that when the spindle 1 rotates, the thin-walled tube 100 can be driven to rotate together. During turning, the two ends of the spindle 1 can be clamped on the lathe to drive the thin-walled tube 100 to rotate, so that the thin-walled tube 100 can be turned. Compared with directly clamping and turning the thin-walled tube 100, when the traditional three-jaw chuck is clamped, the thin-walled tube 100 will be squeezed or partially dented when subjected to the clamping force. The clamping spindle 1 drives the thin-walled tube 100 to rotate to prevent the thin-walled tube 100 from being clamped and deformed. On the other hand, the two ends of the thin-walled tube 100 are not clamped, which facilitates turning of the two ends of the thin-walled tube 100. The support block 31 is tightly pressed against the inner wall of the thin-walled tube 100, so that the support block 31 supports the two ends of the thin-walled tube 100, which can prevent the two ends of the thin-walled tube 100 from being deformed during turning, which is beneficial to improving the turning accuracy of the thin-walled tube 100.

[0023] In one embodiment of the present application, see Figure 3 and Figure 7 As shown, a first through hole 22 is formed at one end of the inner support body 2 , and the first through hole 22 is used for plugging with a first fixing bolt 221 . A first threaded hole 222 is formed on the side wall of the main shaft 1 .

[0024] In the above embodiment, if Figure 2 As shown, the main shaft 1 passes through the middle through hole of the inner support body 2, so that the inner support body 2 is sleeved on the main shaft 1, and a first through hole 22 is opened on the side wall of one end of the inner support body 2, and a first fixing bolt 221 is arranged in the first through hole 22, and a first threaded hole 222 is opened on the side wall of the shaft body of the main shaft 1. When in use, the first through hole 22 at one end of the inner support body 2 sleeved on the main shaft 1 is aligned with the first threaded hole 222, and then the first fixing bolt 221 is passed through the first through hole 22 and screwed into the first threaded hole 222 to realize the fixed connection between the inner support body 2 and the main shaft 1. The inner support body 2 can be separated from the main shaft 1 by screwing out the first fixing bolt 221, which is beneficial to improving the convenience of assembling the inner support body 2 and the main shaft 1.

[0025] In one embodiment of the present application, refer to Figure 4 , Figure 5 and Figure 6 As shown, second threaded holes 23 are provided between the grooves 21 , and the ball carrier 212 is formed by splicing a plurality of perforated plates 213 , and a second through hole 214 is opened on the perforated plates 213 .

[0026] In the above embodiment, Figure 4 As shown, the ball carrier 212 is formed by a plurality of perforated plates 213 connected around the outer side of the inner support body 2. The perforated plate 213 is covered on the outer side of the groove 21, and a second through hole 214 is opened on the perforated plate 213. The fixing bolt passes through the second through hole 214 and is screwed into the second threaded hole 23 provided between the grooves 21 to fix the perforated plate 213 on the outer side of the groove 21. Figure 6 As shown, the bearing steel ball 211 is limited between the orifice plate 213 and the groove 21, and part of the curved end of the bearing steel ball 211 protrudes from the leakage hole of the orifice plate 213, so that when the inner support body 2 is placed in the thin-walled tube 100, the bearing steel ball 211 in the groove 21 of the inner support body 2 is in sliding contact with the inner wall of the thin-walled tube 100, which can reduce the friction between the inner support body 2 and the inner wall of the thin-walled tube 100 during the placement process, which is beneficial to improve the smoothness of the placement of the inner support body 2 into the thin-walled tube 100.

[0027] In one embodiment of the present application, see Figure 7 As shown, the outer side wall of the main shaft 1 is provided with a shaft shoulder 11 .

[0028] In the above embodiment, the shoulder 11 is a protruding ring arranged on the outer wall of the main shaft 1. The axial radius at the shoulder 11 is larger than the axial radius of the main shaft 1. It is used to position the inner support body 2 when the inner support body 2 is sleeved and installed, so as to avoid relative sliding of the inner support body 2 on the main shaft 1 when the inner support body 2 is initially nested in the outer wall of the main shaft 1, causing deviation when the first through hole 22 and the first threaded hole 222 are docked and the first fixing bolt 221 is screwed in, which is inconvenient for fixing the inner support body 2. The axial radius at the shoulder 11 is larger than the axial radius of the main shaft 1, which will cause the inner support body 2 to be stuck at the protrusion of the shoulder 11, avoiding relative sliding of the inner support body 2 along the axial direction of the main shaft 1 when the first threaded hole 222 and the first through hole 22 are docked, thereby improving the stability when the first fixing bolt 221 is screwed in, which is beneficial to improving the assembly efficiency of the tooling.

[0029] In one embodiment of the present application, see Figure 3 As shown, a third threaded hole 32 is formed at one end of the end inner support 3 , and a top screw 321 is fitted in the third threaded hole 32 .

[0030] In the above embodiment, the end inner support 3 is sleeved on both ends of the main shaft 1, and one end of the end inner support 3 is provided with a plurality of third threaded holes 32 therethrough. The top screw 321 is screwed into the third threaded hole 32, so that the screwed-in end of the top screw 321 is tightly pressed against the outer ring surface of the main shaft 1, and the top screws 321 in the plurality of third threaded holes 32 are tightly pressed against the outer wall of the main shaft 1, so that the end inner support 3 is clamped and fixed to the outer wall of the main shaft 1. When it is necessary to move the position of the end inner support 3, the top screw 321 can be screwed out to move the end inner support 3 relative to the main shaft 1, so as to adjust the supporting position of the end inner support 3, which is beneficial to improving the flexibility of the assembly of the end inner support 3.

[0031] In one embodiment of the present application, see Figure 3 As shown, the end faces of both ends of the main shaft 1 are provided with threaded sleeves 12, and the threaded sleeves 12 are connected with a lifting ring assembly 121.

[0032] In the above embodiment, the main shaft 1 needs to be hoisted during the transfer process of the main shaft 1. Threaded sleeves 12 are provided on the end faces of both ends of the main shaft 1 to provide connection points for the lifting ring assembly 121. The lifting ring assembly 121 includes a threaded column, and a hanging ring is connected to one end of the threaded column. When in use, one end of the threaded column is screwed into the threaded sleeve 12, and the hanging ring at one end of the threaded column is used to be hung with a lifting hook for lifting and loading and unloading of the tooling. When using the tooling, the threaded column can be rotated in the opposite direction to disassemble the hanging ring assembly, which is beneficial to improving the convenience of using the tooling.

[0033] In one embodiment of the present application, see Figure 2 As shown, the threaded sleeve 12 is matched and connected with the threaded pull rod 122 .

[0034] In the above embodiment, when the main shaft 1 is placed inside the thin-walled tube 100, it is necessary to pull the inserted end of the main shaft 1 inside the thin-walled tube 100 so that the internal support tooling as a whole enters the thin-walled tube 100 for support. One end of the threaded pull rod 122 is provided with a thread, and the threaded end of the threaded pull rod 122 can be screwed into the threaded sleeve 12 so that the threaded pull rod 122 is connected to the main shaft 1. By pulling the threaded pull rod 122, the inserted end of the main shaft 1 is dragged to move inside the thin-walled tube 100, so that the internal support tooling completely enters the thin-walled tube 100. The position of the support tooling inside the thin-walled tube 100 can also be adjusted by the threaded pull rod 122. After the adjustment is completed, the threaded pull rod 122 is rotated to screw the threaded end out of the threaded sleeve 12, which is beneficial to improving the convenience of adjusting the position of the internal support tooling inside the thin-walled tube 100.

[0035] In one embodiment of the present application, see Figure 2 As shown, a support sleeve 4 is provided at one end of the threaded pull rod 122 , and a support flange 41 is provided at one side of the support sleeve 4 .

[0036] In the above embodiment, when the threaded pull rod 122 pulls the main shaft 1 in the thin-walled tube 100, the thin-walled tube 100 will be pulled along with the supporting tooling, thereby causing the internal supporting tooling to be unable to fully enter the thin-walled tube 100. A supporting sleeve 4 is provided at one end of the threaded pull rod 122, that is, the supporting sleeve 4 is provided at the port of the thin-walled tube 100, and the threaded pull rod 122 is inserted into the supporting sleeve 4 from the other side of the supporting sleeve 4. The supporting sleeve 4 can be fixed by a clamp or a gripping method, and when the supporting sleeve 4 is away from the thin-walled tube 100, the supporting sleeve 4 can be fixed by a clamp or a gripping method. The threaded pull rod 122 is pulled at one end, and the support flange 41 set on one side of the support sleeve 4 is used to block the port of the thin-walled tube 100, so that the thin-walled tube 100 cannot move along the pulling direction of the threaded pull rod 122, and the threaded pull rod 122 can pull the main shaft 1 to drive the inner support tooling to move in the thin-walled tube 100 in the pulling direction of the threaded pull rod 122, that is, to prevent the threaded pull rod 122 from pulling the main shaft 1 and driving the thin-walled tube 100 to move together with the main shaft 1, which is beneficial to improve the convenience of the pull rod pulling the inner support tooling to enter the thin-walled tube 100.

[0037] In one embodiment of the present application, see Figure 8 and Fig. 9 As shown, the telescopic assembly includes a support ring 33, a ring surface of the support ring 33 is provided with a fourth threaded hole 331, an adjusting bolt 332 is fitted in the fourth threaded hole 331, a rotating cavity 311 is provided on one side of the support block 31, a rotating head 333 is provided at one end of the adjusting bolt 332, and the rotating head 333 is socketed with the rotating cavity 311.

[0038] In the above embodiment, the ring surface of the support ring 33 is provided with a plurality of fourth threaded holes 331, and each fourth threaded hole 331 is fitted with an adjusting bolt 332, and the bolt cap end of the adjusting bolt 332 is arranged on the inner ring of the support ring 33. The outer side of the support ring 33 is surrounded by a plurality of support blocks 31, and the support block 31 is provided with a rotating cavity 311 on the side facing the support ring 33. The end of the adjusting bolt 332 extending out of the support ring 33 is provided with a rotating head 333. The inner cavity of the rotating cavity 311 is large and the opening is small. The rotating cavity 311 is sleeved with the rotating head 333. The adjusting bolt 332 can be rotated and adjusted by clamping the bolt cap of the adjusting bolt 332 with a tool such as a long-handled wrench. The shaft of the adjusting bolt 332 extends out from the opening of the rotating cavity 311. The radius of the rotating head 333 of the adjusting bolt 332 is larger than the radius of the shaft of the adjusting bolt 332, so that the rotating The head 333 is nested in the rotating cavity 311, and the rotating head 333 can rotate in the rotating cavity 311. When the adjusting bolt 332 is screwed out of the support ring 33, the rotating head 333 of the adjusting bolt 332 pushes the support block 31 to move toward the inner wall of the thin-walled tube 100 to achieve tightness. When the adjusting bolt 332 is screwed into the support ring 33, the rotating head 333 pulls the support block 31 away from the inner wall of the thin-walled tube 100, that is, the extension and contraction of the support block 31 are controlled by screwing the adjusting bolt 332 in and out relative to the support ring 33. When the support block 31 is extended, the support block 31 supports both ends of the thin-walled tube 100, which can prevent the two ends of the thin-walled tube 100 from deforming during turning, which is beneficial to improving the turning accuracy of the thin-walled tube 100. When the support block 31 contracts, the outer diameter of the end inner support 3 is reduced to facilitate the placement of the inner support tooling into the thin-walled tube 100.

[0039] In one embodiment of the present application, see Figure 1 As shown, a gasket is adhered to the outer surface of the support block 31.

[0040] In the above embodiment, a gasket is adhered to the side of the support block 31 that abuts against the thin-walled tube 100. The gasket is used to reduce the hardness of the contact surface between the support block 31 and the inner wall of the thin-walled tube 100 and increase the friction between the contact surface between the support block 31 and the inner wall of the thin-walled tube 100. The gasket can be a rubber pad.

[0041] In the actual use of this application: the main shaft 1 is respectively provided with a middle-end support portion and an end-end support portion, the middle-end support portion includes an inner support body 2 connected to the middle part of the main shaft 1, and the end-end support portion includes an end-end inner support 3 respectively sleeved on the two ends of the main shaft 1, wherein the inner support body 2 is used to support the middle end of the thin-walled tube 100, and the end-end inner support 3 is used to support the two ends of the thin-walled tube 100, the main shaft 1 passes through the middle through hole of the inner support body 2, so that the inner support body 2 is sleeved on the main shaft 1, a first through hole 22 is opened on the side wall of one end of the inner support body 2, and a first fixing bolt 221 is arranged in the first through hole 22, and a first threaded hole 222 is opened on the side wall of the shaft body of the main shaft 1, and when in use, The first through hole 22 at one end of the inner support body 2 sleeved on the main shaft 1 is aligned with the first threaded hole 222, and then the first fixing bolt 221 is passed through the first through hole 22 and screwed into the first threaded hole 222 to achieve a fixed connection between the inner support body 2 and the main shaft 1. The inner support body 2 and the main shaft 1 can be separated by screwing out the first fixing bolt 221. A plurality of grooves 21 are evenly arranged on the outer side of the inner support body 2. The grooves 21 are used to place bearing steel balls 211, and a ball rack 212 is provided on the outer side cover of the groove 21. The ball rack 212 is used to limit the bearing steel balls 211 in the groove 21. The ball rack 212 clamps the bearing steel balls 211 in the gap between the ball rack 212 and the groove 21. Optionally, the ball rack 212 is formed by a plurality of perforated plates 213 connected around the outer side of the inner support body 2, the perforated plate 213 is covered on the outer side of the groove 21, and a second through hole 214 is opened on the perforated plate 213, and a fixing bolt is passed through the second through hole 214 and screwed into the second threaded hole 23 provided between the grooves 21 to fix the perforated plate 213 on the outer side of the groove 21, such as Figure 6As shown, the bearing steel ball 211 is limited between the orifice plate 213 and the groove 21, and part of the curved surface end of the bearing steel ball 211 protrudes from the leakage hole of the orifice plate 213, so that when the inner support body 2 is placed in the thin-walled tube 100, the bearing steel ball 211 in the groove 21 of the inner support body 2 slides and contacts with the inner wall of the thin-walled tube 100, which can reduce the friction between the inner support body 2 and the inner wall of the thin-walled tube 100 during the placement process. A through hole is provided on the outer side of the end inner support 3 for plugging and fixing with the main shaft 1, and the support block 31 is connected to the outer ring side of the end inner support 3 through a telescopic component, and the support block 31 abuts against the inner wall of the thin-walled tube 100. Furthermore, the end inner support 3 is sleeved on both ends of the main shaft 1, and one end of the end inner support 3 is provided with a plurality of penetrating third threaded holes 32. The top screw 321 is screwed into the third threaded hole 32, so that the screwed-in end of the top screw 321 is tightly pressed against the outer ring surface of the main shaft 1, and the top screws 321 in the plurality of third threaded holes 32 are tightly pressed against the outer wall of the main shaft 1, so that the end inner support 3 is clamped and fixed to the outer wall of the main shaft 1. When the position of the end inner support 3 needs to be moved, the top screw 321 can be screwed out to move the end inner support 3 relative to the main shaft 1 to adjust the supporting position of the end inner support 3. Optionally, the telescopic component includes a support ring 33, a ring surface of the support ring 33 is provided with a plurality of fourth threaded holes 331, each fourth threaded hole 331 is fitted with an adjusting bolt 332, the bolt cap end of the adjusting bolt 332 is arranged on the inner ring of the support ring 33, a plurality of support blocks 31 are arranged around the outer side of the support ring 33, a rotating cavity 311 is provided on the side of the support block 31 facing the support ring 33, a rotating head 333 is provided on the end of the adjusting bolt 332 extending out of the support ring 33, the inner cavity of the rotating cavity 311 is large and the opening is small, the rotating cavity 311 is sleeved with the rotating head 333, the shaft of the adjusting bolt 332 extends out from the opening of the rotating cavity 311, and the rotating head 333 of the adjusting bolt 332 is adjusted. The radius of 33 is larger than the rod radius of the adjusting bolt 332, so that the rotating head 333 is nested in the rotating cavity 311, and the rotating head 333 can rotate in the rotating cavity 311. When the adjusting bolt 332 is screwed out of the support ring 33, the rotating head 333 of the adjusting bolt 332 pushes the support block 31 to move toward the inner wall of the thin-walled tube 100 to achieve tightness. When the adjusting bolt 332 is screwed into the support ring 33, the rotating head 333 pulls the support block 31 away from the inner wall of the thin-walled tube 100, that is, the extension and contraction of the support block 31 are controlled by screwing the adjusting bolt 332 in and out relative to the support ring 33. When the support block 31 is extended, the support block 31 supports both ends of the thin-walled tube 100.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A turning inner support tool, characterized in that: The invention comprises a main shaft (1), wherein the main shaft (1) is respectively provided with a middle support portion and an end support portion, wherein the middle support portion comprises an inner support body (2) arranged in the middle of the main shaft (1), and the end support portion comprises an end inner support (3) respectively sleeved on two ends of the main shaft (1), wherein the outer side surface of the inner support body (2) is provided with a plurality of grooves (21), wherein bearing steel balls (211) are placed in the grooves (21), and a ball rack (212) is provided on the outer side cover of the grooves (21), wherein the ball rack (212) is used to limit the bearing steel balls (211) in the grooves (21), and a support block (31) is provided on the outer side of the end inner support (3), wherein the support block (31) is connected to the outer ring side wall of the end inner support (3) through a telescopic component.

2. The turning inner support tooling according to claim 1, characterized in that: A first through hole (22) is provided at one end of the inner support body (2), the first through hole (22) being used for plugging with a first fixing bolt (221), and a first threaded hole (222) is provided on a side wall of the shaft body of the main shaft (1).

3. The turning inner support tooling according to claim 2, characterized in that: A second threaded hole (23) is provided between the grooves (21); the ball bearing rack (212) is formed by splicing a plurality of perforated plates (213); and a second through hole (214) is provided on the perforated plates (213).

4. The turning inner support tooling according to claim 3, characterized in that: The outer side wall of the main shaft (1) is provided with a shaft shoulder (11).

5. The turning inner support tool according to claim 1, characterized in that: A third threaded hole (32) is formed at one end of the end inner support (3), and a top screw (321) is fitted in the third threaded hole (32).

6. The turning inner support tool according to claim 1, characterized in that: The end surfaces at both ends of the main shaft (1) are provided with threaded sleeves (12), and a lifting ring assembly (121) is connected inside the threaded sleeve (12).

7. The turning inner support tool according to claim 6, characterized in that: The threaded sleeve (12) is matched and connected with the threaded pull rod (122).

8. The turning inner support tool according to claim 7, characterized in that: A support sleeve (4) is provided at one end of the threaded pull rod (122), and a support flange (41) is provided at one side of the support sleeve (4).

9. The turning inner support tool according to claim 2, characterized in that: The telescopic assembly comprises a support ring (33); a fourth threaded hole (331) is provided on a ring surface of the support ring (33); an adjusting bolt (332) is fitted in the fourth threaded hole (331); a rotating cavity (311) is provided on one side of the support block (31); a rotating head (333) is provided at one end of the adjusting bolt (332); and the rotating head (333) is sleeved with the rotating cavity (311).

10. The turning inner support tool according to claim 9, characterized in that: A gasket is adhered to the outer surface of the support block (31).

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