Turnover clamp for assembling tubular workpieces

Abstract

The invention discloses an overturning clamp for assembling tubular workpieces, and relates to the field of technical mechanical machining.The overturning clamp for assembling the tubular workpieces comprises a base, a supporting and limiting mechanism is arranged on the base, and the supporting and limiting mechanism comprises two symmetrically-arranged movable supporting columns; two clamping assemblies are arranged on the two movable supporting columns through turnover mechanisms correspondingly. The clamping assembly comprises a limiting round shell, a plurality of inner clamping driving devices are fixedly arranged at the outer side end of the limiting round shell, and the telescopic ends of the inner clamping driving devices are fixedly connected with clamping fixing bases. The two sides of the clamping fixing base are connected with clamping top plates through elastic assemblies. A cam assembly is further arranged in the clamping and fixing base. Through the arrangement of the cam assembly, the two clamping top plates can stretch out to abut against the inner wall of the end of the tubular workpiece, the radial inner clamping effect on the tubular workpiece is achieved, in this way, the clamping stability can be effectively improved, and the end area of the tubular workpiece can be exposed for corresponding assembling operation.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a turning fixture for assembling tubular workpieces. Background Art

[0002] In the assembly process of tubular workpieces (such as hydraulic pipelines and drive shafts), the clamping system is the core equipment for achieving precise positioning and stable clamping. Current technical solutions generally use a double-platen clamping structure. Its typical structure includes a pair of rigid clamping plates positioned opposite each other. The distance between the clamping plates is adjusted by a linear drive mechanism to achieve radial clamping of the two ends of the workpiece. To ensure stable clamping, the contact length between the clamping plates and the workpiece typically needs to cover an area of 15-30mm at the end, forming a full-circumferential wraparound clamping. However, there are the following problems: 1. The problem of encroachment on assembly space. The wrap-around clamping of the workpiece end by the splint makes it impossible to perform key assembly operations such as welding, grinding, and drilling in the covered area; 2. Impact on assembly efficiency. When it is necessary to assemble the circumference of a tubular workpiece or multiple tubular workpieces, the "clamping-disassembly-shifting-re-clamping" cycle operation must be repeated, which will seriously restrict the assembly efficiency; 3. Process quality risk. Each time the fixture is re-clamped, there is a certain positioning deviation, which will directly affect the coaxiality of the assembly; 4. Clamping deformation. For slender pipes with a length-to-diameter ratio greater than 8:1, or special-shaped pipes (the openings at both ends are not on the same straight line), the centralized high-strength clamping at both ends will cause flexural deformation in the middle, which will directly affect the assembly quality. Summary of the Invention

[0003] The purpose of the present invention is to provide a turning fixture for assembling tubular workpieces to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a turning fixture for assembling tubular workpieces, comprising a base, the base being provided with a support and limiting mechanism, the support and limiting mechanism comprising two symmetrically arranged movable support columns, the two movable support columns being respectively provided with two oppositely arranged and rotatable clamping assemblies via a turning mechanism;

[0005] The clamping assembly includes a limiting circular shell, the outer end of which is fixedly provided with a plurality of internal clamping drive devices, and the telescopic end of the internal clamping drive device is fixedly connected to a clamping fixing seat;

[0006] Both sides of the clamping fixing seat are connected to the clamping top plate through elastic components, and the elastic components act on the clamping top plate so that the clamping top plate can be received in the clamping fixing seat;

[0007] A cam assembly is also provided in the clamping fixing seat, and the cam assembly acts on the two clamping top plates so that the two clamping top plates can be synchronously extended out of the clamping fixing seat.

[0008] Furthermore, the inner end of the limiting circular shell is provided with a plurality of limiting circular holes corresponding to the plurality of inner clamping drive devices respectively, and the plurality of limiting circular holes are evenly distributed on the inner end surface of the limiting circular shell in a circular array;

[0009] The diameter of the limiting circular hole is adapted to the outer diameter of the clamping and fixing seat, and the clamping and fixing seat can move axially relative to the limiting circular hole;

[0010] The inner clamping driving device acts on the clamping fixing seat, so that the clamping fixing seat can be received in or extended out of the limiting circular hole.

[0011] Furthermore, rectangular limiting holes are provided on both sides of the clamping and fixing seat;

[0012] The elastic component includes an elastic top support plate connected to the clamping fixing seat and located at the rectangular limiting hole;

[0013] The elastic component also includes two movable push rods connected to the inner end of the clamping top plate and capable of radially moving relative to the rectangular limit hole, the two movable push rods are respectively located on both sides of the elastic top support plate, and the inner ends of the two movable push rods are connected to the same linkage push plate located on the inner side of the elastic top support plate;

[0014] The elastic component also includes a return spring connected between the inner end of the elastic top support plate and the outer end of the linkage push plate. The return spring acts on the linkage push plate so that the clamping top plate can be received in the rectangular limiting hole.

[0015] Furthermore, a plurality of rubber anti-slip strips are provided on the outer end of the clamping top plate.

[0016] Furthermore, the cam assembly includes a cam driving device installed in the clamping base, the output shaft of the cam driving device is connected to a positioning shaft rotatably connected to the clamping base, the positioning shaft is sleeved with a limit cam, and the limit cam has two symmetrical large-diameter ends and two symmetrical small-diameter ends;

[0017] When the two small-diameter ends of the limiting cam are respectively facing the two linked push plates, the linked push plates, under the action of the return spring, receive the clamping top plate into the rectangular limiting hole;

[0018] When the large diameter ends of the limiting cam are respectively facing the two linked push plates, the large diameter ends of the limiting cam abut against the two linked push plates, so that the linked push plates overcome the effect of the reset springs and extend the clamping top plate out of the rectangular limiting hole.

[0019] Furthermore, the flip mechanism includes a limit fixing plate, a limit shaft hole is provided on the limit fixing plate, a rotation support shaft is rotatably provided on the inner wall of the limit shaft hole through a bearing, and the limit circular shell is connected to the inner end of the rotation support shaft;

[0020] The flip mechanism also includes a flip driving device connected to the limit fixing plate, the output shaft of the flip driving device is fixedly provided with a driving gear, and the rotating support shaft is sleeved with a driven gear that cooperates with the driving gear.

[0021] Furthermore, an annular scale bar is fixedly provided on the outer end of the limiting circular shell;

[0022] An indicator block that can cooperate with the annular scale bar is fixedly provided on the top of the limit fixing plate;

[0023] The annular scale bar, the limiting circular shell and the rotating support shaft are all located on the same axis.

[0024] Furthermore, the clamping and fixing seat is a cylindrical shell structure.

[0025] Furthermore, a rectangular moving groove and a motor mounting groove are provided on the upper surface of the base;

[0026] The support and limiting mechanism includes a bidirectional threaded rod rotatably mounted in a rectangular movable groove, the bidirectional threaded rod having a left spiral section, a middle idle section and a right spiral section connected in sequence, and two movable bottom blocks are respectively matched on the left spiral section and the right spiral section, and the two movable bottom blocks are respectively connected to the bottom ends of the two movable support columns;

[0027] The support and limiting mechanism also includes a limiting drive device installed in the motor installation slot, the output shaft of the limiting drive device is fixedly provided with a first bevel gear, and the middle idle section of the bidirectional threaded rod is sleeved with a second bevel gear meshing with the first bevel gear.

[0028] Furthermore, a support frame is provided on the base, and the support frame has a guide plate;

[0029] The movable support column is provided with a guide through hole which can match the guide plate.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, the spacing between the two clamping assemblies can be adjusted to adapt to the length of the tubular workpiece through the support and limit mechanism, thereby performing axial end clamping on the tubular workpiece. By setting the inner clamping drive device, the clamping fixed seat can be deeply inserted into the inner diameter of the tubular workpiece. By setting the cam assembly, the two clamping top plates can be extended to abut against the inner wall of the end of the tubular workpiece, thereby performing radial inward clamping on the tubular workpiece. In this way, the clamping stability can be effectively improved, and the end area of the tubular workpiece can be exposed for corresponding assembly operations.

[0032] 2. In the present invention, the flipping mechanism can drive the clamping assembly to achieve 0-360° rotation. On the one hand, during positioning, the relative positions of the clamping seats on the two clamping assemblies can be adjusted to meet the end position requirements of special-shaped tubular workpieces (the openings at both ends of the tubular workpiece are not on the same straight line). On the other hand, during assembly, the area to be assembled of the tubular workpiece can be exposed, which can effectively reduce the number of clamping and disassembly times, thereby improving the quality and efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front view structural schematic diagram of the present invention;

[0034] Figure 2 It is a side structural schematic diagram of the present invention;

[0035] Figure 3 It is a schematic diagram of a partial front cross-section structure of the present invention;

[0036] Figure 4 It is a schematic diagram of a partial top-sectional structure of the base in the present invention;

[0037] Figure 5 Schematic diagram of the front cross-section structure of the limiting circular shell in the present invention;

[0038] Figure 6 This is a front view structural diagram of the flip mechanism in the present invention;

[0039] Figure 7 Schematic diagram of the internal structure of the clamping fixing seat in the present invention;

[0040] Figure 8 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0041] In the figure: 1. Base; 2. Support and limit mechanism; 3. Clamping assembly; 4. Flip mechanism; 5. Rectangular moving slot;

[0042] 201, movable support column; 202, bidirectional threaded rod; 203, movable bottom block; 204, limit drive device; 205, first bevel gear; 206, second bevel gear; 207, guide plate;

[0043] 301, limiting circular shell; 302, internal clamping drive device; 303, clamping fixed seat; 305, clamping top plate; 306, limiting circular hole; 307, cam drive device; 308, positioning shaft; 309, limiting cam; 310, rectangular limiting hole; 311, movable push rod; 312, linkage push plate; 313, return spring; 314, rubber anti-slip strip;

[0044] 401, limit fixing plate; 402, rotation support shaft; 403, flip driving device; 404, driving gear; 405, driven gear; 406, indicator block; 407, annular scale bar. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] See also Figures 1-8 The present invention provides a technical solution: a turning fixture for assembling tubular workpieces, comprising a base 1, a support and limiting mechanism 2 provided on the base 1, the support and limiting mechanism 2 comprising two symmetrically arranged movable support columns 201, and two oppositely arranged and rotatable clamping assemblies 3 provided on the two movable support columns 201 respectively through a turning mechanism 4;

[0047] The clamping assembly 3 includes a limiting circular shell 301, and a plurality of internal clamping drive devices 302 are fixedly provided on the outer end of the limiting circular shell 301. The telescopic end of the internal clamping drive device 302 is fixedly connected to a clamping fixing seat 303;

[0048] Both sides of the clamping fixing seat 303 are connected to the clamping top plate 305 through elastic components. The elastic components act on the clamping top plate 305 so that the clamping top plate 305 can be received in the clamping fixing seat 303.

[0049] A cam assembly is further provided in the clamping fixing seat 303 , and the cam assembly acts on the two clamping top plates 305 so that the two clamping top plates 305 can be synchronously extended out of the clamping fixing seat 303 .

[0050] In this embodiment, the distance between the two clamping assemblies 3 can be adjusted through the support limiting mechanism 2 to adapt to the length of the tubular workpiece, and the axial end clamping effect is performed on the tubular workpiece; through the setting of the internal clamping drive device 302, the clamping fixed seat 303 can be penetrated into the inner diameter of the tubular workpiece; through the setting of the cam assembly, the two clamping top plates 305 can be extended to abut against the inner wall of the end of the tubular workpiece, and the tubular workpiece can be clamped radially inwardly. In this way, the clamping stability can be effectively improved, and the end area of the tubular workpiece can be exposed for corresponding assembly operations.

[0051] The flipping mechanism 4 can drive the clamping assembly 3 to achieve 0-360° rotation. On the one hand, during positioning, the relative positions of the clamping fixing seats 303 on the two clamping assemblies 3 can be adjusted to meet the end position requirements of special-shaped tubular workpieces. On the other hand, during assembly, the area to be assembled of the tubular workpiece can be exposed, which can effectively reduce the number of clamping and disassembly times, thereby improving the quality and efficiency of assembly.

[0052] The arrangement of the elastic component can reset the two clamping top plates 305. The inner clamping drive device 302 can be an electric push rod, a small cylinder, etc.

[0053] Preferably, the inner end of the limiting circular shell 301 is provided with a plurality of limiting circular holes 306 corresponding to the plurality of inner clamping drive devices 302, and the plurality of limiting circular holes 306 are evenly distributed on the inner end surface of the limiting circular shell 301 in a circular array;

[0054] The diameter of the limiting circular hole 306 is adapted to the outer diameter of the clamping and fixing seat 303 , and the clamping and fixing seat 303 can move axially relative to the limiting circular hole 306 ;

[0055] The inner clamping driving device 302 acts on the clamping fixing seat 303 , so that the clamping fixing seat 303 can be received in or extended out of the limiting circular hole 306 .

[0056] Such an arrangement, on the one hand, can facilitate the clamping operation of multiple tubular workpieces to meet the corresponding assembly requirements; on the other hand, corresponding clamping operations can be performed on special-shaped tubular workpieces. Specifically, if the openings at both ends of the special-shaped tubular workpiece are not on the same straight line, appropriate clamping fixing seats 303 on the two clamping components 3 can be selected to provide radial inward support for the ends of the aforementioned special-shaped tubular workpieces.

[0057] Preferably, rectangular limiting holes 310 are provided on both sides of the clamping and fixing seat 303;

[0058] The elastic component includes an elastic top support plate connected to the clamping fixing seat 303 and located at the rectangular limiting hole 310;

[0059] The elastic assembly further includes two movable push rods 311 connected to the inner ends of the clamping top plate 305 and capable of radially moving relative to the rectangular limiting hole 310. The two movable push rods 311 are respectively located on both sides of the elastic top support plate. The inner ends of the two movable push rods 311 are connected to the same linkage push plate 312 located on the inner side of the elastic top support plate.

[0060] The elastic component also includes a return spring 313 connected between the inner end of the elastic top support plate and the outer end of the linkage push plate 312. The return spring 313 acts on the linkage push plate 312 so that the clamping top plate 305 can be received in the rectangular limiting hole 310.

[0061] In this embodiment, the cooperation between the movable push rod 311 and the rectangular stop hole 310 enhances the stability of the telescopic movement of the clamping top plate 305. The reset spring 313 provides elastic support for the clamping top plate 305 to return to its original position within the rectangular stop hole 310. Furthermore, it provides a buffering force for the tubular workpiece when the clamping top plate 305 is pushed out of the rectangular stop hole 310 to support the inner wall of the end of the tubular workpiece.

[0062] Preferably, a plurality of rubber anti-slip strips 314 are provided on the outer end of the clamping top plate 305. The rubber anti-slip strips are used to contact and press against the inner wall of the cylindrical workpiece, thereby playing an anti-slip and limiting effect, further improving the stability of the clamping inside the workpiece.

[0063] Preferably, the cam assembly includes a cam driving device 307 installed in the clamping base 303, the output shaft of the cam driving device 307 is connected to a positioning shaft 308 rotatably connected to the clamping base 303, the positioning shaft 308 is sleeved with a limit cam 309, and the limit cam 309 has two symmetrical large-diameter ends and two symmetrical small-diameter ends;

[0064] When the two small-diameter ends of the limiting cam 309 are respectively facing the two linkage push plates 312, the linkage push plates 312, under the action of the return spring 313, receive the clamping top plate 305 into the rectangular limiting hole 310;

[0065] When the large diameter ends of the limiting cam 309 are respectively facing the two linked push plates 312, the large diameter ends of the limiting cam 309 abut against the two linked push plates 312, so that the linked push plates 312 overcome the action of the return spring 313 and extend the clamping top plate 305 out of the rectangular limiting hole 310.

[0066] In this embodiment, the cam driving device 307 can be a rotary cylinder, a reduction motor, etc.

[0067] During application, the cam driving device 307 is used to drive the limit cam 309 to rotate. When the two large diameter ends of the limit cam 309 are facing the two linked push plates 312, the limit cam 309 will push the two linked push plates 312, and then drive the clamping top plates 305 on both sides of the clamping fixed seat 303 to tighten and limit the inner wall of the tubular workpiece.

[0068] The two large-diameter and small-diameter ends of the limit cam 309 have smooth transitions. During the rotation of the limit cam 309, tubular workpieces of varying inner diameters can be clamped radially inward, improving the positioning of tubular workpieces. Furthermore, this clamping method does not occupy space on the outer surface of the workpiece, facilitating assembly operations on the surface of tubular workpieces.

[0069] Preferably, the flip mechanism 4 includes a limiting fixing plate 401, a limiting shaft hole is provided on the limiting fixing plate 401, a rotating support shaft 402 is rotatably provided on the inner wall of the limiting shaft hole through a bearing, and the limiting circular shell 301 is connected to the inner end of the rotating support shaft 402;

[0070] The flip mechanism 4 further includes a flip driving device 403 connected to the limiting fixing plate 401 . A driving gear 404 is fixedly provided on the output shaft of the flip driving device 403 . A driven gear 405 that cooperates with the driving gear 404 is sleeved on the rotating support shaft 402 .

[0071] In this embodiment, the turning drive device 403 can be a reduction motor. Starting the turning drive device 403 can drive the driving gear 404 to rotate, and through the cooperation of the driven gear 405 and the driving gear 404, the rotating support shaft 402 can be driven to rotate, and further the limiting circular shell 301 can be driven to rotate.

[0072] Preferably, an annular scale bar 407 is fixedly provided on the outer end of the limiting circular shell 301;

[0073] An indicator block 406 that can cooperate with the annular scale bar 407 is fixedly provided on the top of the limit fixing plate 401;

[0074] The annular scale bar 407 , the limiting circular shell 301 and the rotating support shaft 402 are all located on the same axis.

[0075] In this embodiment, the rotation angle of the limiting circular shell 301 can be referenced and positioned by cooperating with the indicator block 406 and the annular scale bar 407. In this way, the relative positions of the clamping fixed seats 303 on the two clamping components 3 can be easily adjusted to meet the position requirements of clamping special-shaped tubular workpieces.

[0076] Preferably, the clamping and fixing seat 303 is a cylindrical shell structure.

[0077] Preferably, a rectangular moving groove 5 and a motor mounting groove are provided on the upper surface of the base 1;

[0078] The support and limiting mechanism 2 includes a bidirectional threaded rod 202 rotatably mounted in a rectangular movable groove 5. The bidirectional threaded rod 202 has a left spiral section, a middle idle section, and a right spiral section connected in sequence. The left spiral section and the right spiral section are respectively equipped with two movable bottom blocks 203. The two movable bottom blocks 203 are respectively connected to the bottom ends of the two movable support columns 201.

[0079] The support and limiting mechanism 2 also includes a limiting drive device 204 installed in the motor mounting slot. The output shaft of the limiting drive device 204 is fixedly provided with a first bevel gear 205, and the middle idle section of the bidirectional threaded rod 202 is sleeved with a second bevel gear 206 that meshes with the first bevel gear 205.

[0080] In this embodiment, a reduction motor can be used as the limit drive device 204. Starting the limit drive device 204 drives the first bevel gear 205 to rotate. The second bevel gear 206 cooperates with the first bevel gear 205, which in turn drives the bidirectional threaded rod 202 to rotate accordingly. Furthermore, the left and right helical segments cooperate with the two movable bottom blocks 203 to adjust the spacing between the two movable bottom blocks 203, and thus the spacing between the two clamping assemblies 3, to meet the requirements for clamping the ends of tubular workpieces.

[0081] The movable bottom block 203 should match the rectangular movable groove 5 , so that the rectangular movable groove can guide and limit the movable bottom block 203 .

[0082] Preferably, a support frame is provided on the base 1, and the support frame has a guide plate 207;

[0083] The movable support column 201 is provided with a guide through hole that can match the guide plate 207 .

[0084] In this embodiment, the cooperation between the guide plate 207 and the guide through hole can improve the stability of the two clamping components moving toward and away from each other.

[0085] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A turning fixture for assembling tubular workpieces, comprising a base (1), characterized in that: A support and limiting mechanism (2) is provided on the base (1), and the support and limiting mechanism (2) comprises two symmetrically arranged movable support columns (201), and two relatively arranged and rotatable clamping assemblies (3) are respectively provided on the two movable support columns (201) via a turning mechanism (4); The clamping assembly (3) comprises a limiting circular shell (301), a plurality of internal clamping drive devices (302) are fixedly provided on the outer end of the limiting circular shell (301), and a clamping fixing seat (303) is fixedly connected to the telescopic end of the internal clamping drive device (302); Both sides of the clamping fixing seat (303) are connected to a clamping top plate (305) via an elastic component, and the elastic component acts on the clamping top plate (305) so that the clamping top plate (305) can be received in the clamping fixing seat (303); A cam assembly is also provided in the clamping fixing seat (303), and the cam assembly acts on the two clamping top plates (305), so that the two clamping top plates (305) can be synchronously extended out of the clamping fixing seat (303).

2. The turning fixture for assembling tubular workpieces according to claim 1, characterized in that: The inner end of the limiting circular shell (301) is provided with a plurality of limiting circular holes (306) corresponding to the plurality of inner clamping drive devices (302), and the plurality of limiting circular holes (306) are evenly distributed in a circular array on the inner end surface of the limiting circular shell (301); The aperture of the limiting circular hole (306) is adapted to the outer diameter of the clamping and fixing seat (303), and the clamping and fixing seat (303) can move axially relative to the limiting circular hole (306); The inner clamping drive device (302) acts on the clamping fixing seat (303), so that the clamping fixing seat (303) can be received in or extended out of the limiting circular hole (306).

3. The turning fixture for assembling tubular workpieces according to claim 1, characterized in that: Rectangular limiting holes (310) are provided on both sides of the clamping and fixing seat (303); The elastic component comprises an elastic top support plate connected to the clamping fixing seat (303) and located at the rectangular limiting hole (310); The elastic component further includes two movable push rods (311) connected to the inner side ends of the clamping top plate (305) and capable of radially moving relative to the rectangular limiting hole (310), the two movable push rods (311) being respectively located on both sides of the elastic top support plate, and the inner side ends of the two movable push rods (311) being connected to a linkage push plate (312) located on the inner side of the elastic top support plate; The elastic component further includes a return spring (313) connected between the inner end of the elastic top support plate and the outer end of the linkage push plate (312). The return spring (313) acts on the linkage push plate (312) so that the clamping top plate (305) can be received in the rectangular limiting hole (310).

4. The turning fixture for assembling tubular workpieces according to claim 3, characterized in that: The outer end of the clamping top plate (305) is provided with a plurality of rubber anti-slip strips (314).

5. The turning fixture for assembling tubular workpieces according to claim 3, characterized in that: The cam assembly comprises a cam driving device (307) installed in the clamping and fixing seat (303); an output shaft of the cam driving device (307) is connected to a positioning shaft (308) rotatably connected to the clamping and fixing seat (303); a limiting cam (309) is sleeved on the positioning shaft (308); and the limiting cam (309) has two symmetrical large-diameter ends and two symmetrical small-diameter ends; When the two small-diameter ends of the limiting cam (309) are respectively facing the two linkage push plates (312), the linkage push plates (312) receive the clamping top plate (305) in the rectangular limiting hole (310) under the action of the return spring (313); When the large diameter ends of the limiting cam (309) are respectively facing the two linked push plates (312), the large diameter ends of the limiting cam (309) abut against the two linked push plates (312), so that the linked push plates (312) overcome the action of the return spring (313) and extend the clamping top plate (305) out of the rectangular limiting hole (310).

6. The turning fixture for assembling a tubular workpiece according to claim 1, characterized in that: The turning mechanism (4) includes a limiting fixing plate (401), a limiting shaft hole is provided on the limiting fixing plate (401), a rotating support shaft (402) is provided on the inner wall of the limiting shaft hole via a bearing, and the limiting circular shell (301) is connected to the inner side end of the rotating support shaft (402); The flip mechanism (4) further comprises a flip driving device (403) connected to the position-limiting fixed plate (401); a driving gear (404) is fixedly provided on the output shaft of the flip driving device (403); and a driven gear (405) cooperating with the driving gear (404) is sleeved on the rotating support shaft (402).

7. The turning fixture for assembling a tubular workpiece according to claim 6, characterized in that: An annular scale bar (407) is fixedly provided on the outer end of the limiting circular shell (301); An indicator block (406) that can cooperate with the annular scale bar (407) is fixedly provided on the top of the position-limiting fixed plate (401); The annular scale bar (407), the limiting circular shell (301) and the rotating support shaft (402) are all located on the same axis.

8. The turning fixture for assembling a tubular workpiece according to claim 1, characterized in that: The clamping and fixing seat (303) is a cylindrical shell structure.

9. The turning fixture for assembling a tubular workpiece according to claim 1, characterized in that: The upper surface of the base (1) is provided with a rectangular moving groove (5) and a motor mounting groove; The support and limiting mechanism (2) comprises a bidirectional threaded rod (202) rotatably mounted in a rectangular movable groove (5), the bidirectional threaded rod (202) having a left spiral section, a middle idle section and a right spiral section connected in sequence, the left spiral section and the right spiral section respectively being equipped with two movable bottom blocks (203), the two movable bottom blocks (203) respectively being connected to the bottom ends of the two movable support columns (201); The support and limiting mechanism (2) further comprises a limiting drive device (204) installed in the motor installation slot, the output shaft of the limiting drive device (204) is fixedly provided with a first bevel gear (205), and the middle idle section of the bidirectional threaded rod (202) is sleeved with a second bevel gear (206) meshing with the first bevel gear (205).

10. The turning fixture for assembling a tubular workpiece according to claim 9, characterized in that: A support frame is provided on the base (1), and the support frame has a guide plate (207); The movable support column (201) is provided with a guide through hole that can match the guide plate (207).

Images