Rolling forming device for annular groove in inner wall of pipe

Abstract

The invention discloses a pipe inner wall annular groove roll forming device which comprises an operation bottom plate, the operation bottom plate is provided with a roll forming device, the roll forming device comprises an adjusting unit, a clamping unit and a linkage unit, the adjusting unit and the clamping unit are connected, the adjusting unit comprises embedded blocks, the two embedded blocks are provided with embedded plates, and the linkage unit is connected with the clamping unit. A sliding groove is formed in the embedding plate, an embedding sliding block is arranged in the sliding groove, a rotating disc is arranged at the top of the embedding sliding block, and a clamping block is arranged at the top of the rotating disc. According to the rolling forming device for the annular groove in the inner wall of the pipe, through the arrangement of an embedded block in the adjusting unit, it is guaranteed that the whole adjusting unit does not deviate when the whole adjusting unit is used for machining a close pipe, and the machining accuracy is guaranteed; and the grinding position of the extrusion rod can be quickly and conveniently changed, so that the depth of the annular groove and the spiral angle of the groove are adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of metal non-cutting pressure, in particular to a rolling forming device for annular grooves on the inner wall of a pipe. Background Art

[0002] At present, the forming of annular grooves on the inner wall of pipes is mostly done by mechanical cutting, such as turning, boring, milling, etc., which has low efficiency and large metal consumption. Non-cutting processing, such as rolling, rubbing, etc., can only form continuous spiral grooves on the inner wall of the pipe, and cannot generate annular grooves with a certain distance interval.

[0003] The method of rolling the annular groove on the inner wall of the pipe is suitable for finishing processing with a small amount of reduction in the cold state. The rolling head has only a single row of rollers, the boring bar is a cantilever structure with poor rigidity, and the feed of the rolling body cannot be dynamically adjusted online.

[0004] For example, a device for rolling annular grooves on the inner wall of a pipe disclosed in Chinese patent publication number CN103143604B, in which an arc-surface cone moves back and forth on a screw mandrel to push a rolling ball to machine an annular groove on the inner wall of the pipe, and the groove depth reaches half the diameter of the rolling ball, and there are multiple rows of clamping rollers arranged in a semicircular arc. While the clamping rollers hold the pipe tightly, the pipe is slightly expanded and contracted along the axial direction due to the rolling between the clamping rollers and the pipe during the rolling process, which is beneficial to the flow of the metal rolled out in the groove. The rolling head and the screw mandrel are in the "double transmission" form of a main transmission device and a connecting shaft transmission device, and the speed difference controls the propulsion speed of the arc-surface cone on the screw mandrel, thereby realizing online dynamic adjustment of the radial feed speed of the rolling ball, ball or roller along the pipe.

[0005] The prior art has the following problems: When the above-mentioned device rolls the annular groove on the inner wall of the pipe, it is difficult to control the fixation of the pipe, which can easily cause the flow of metal in the groove. The position of the rolling ball for the annular groove is fixed when it is processed inside the pipe, so it is difficult to control the adjustment of the groove texture and direction. Summary of the invention

[0006] The object of the present invention is to provide a device for rolling forming annular grooves on the inner wall of a pipe to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a roll forming device for annular grooves on the inner wall of a pipe, comprising an operating base plate, a roll forming device is arranged on the operating base plate, the roll forming device comprises an adjusting unit, a clamping unit and a linkage unit, the adjusting unit and the clamping unit are both mounted on the operating base plate, and the linkage unit is mounted on the clamping unit; The adjustment unit includes an engaging block, which is provided with two groups and respectively installed on both sides of the processing base plate, an engaging plate is provided on the two engaging blocks, a sliding groove is provided on the engaging plate, an engaging slider is provided in the sliding groove, a rotating disk is provided on the top of the engaging slider, a clamping block is provided on the top of the rotating disk, and the clamping block is located on a sliding block.

[0008] According to the above technical solution, a mounting frame is provided on the top of the sliding block, a mounting groove is provided in the mounting frame, a mounting seat is provided in the mounting groove, a top plate is provided on the top of the mounting seat, an extrusion rod is directly provided on the mounting seat and the top plate, a rotating shaft is provided on the top plate, the rotating shaft passes through the mounting seat, the mounting frame and the sliding block, and the other end of the rotating shaft is connected to the rotating disk.

[0009] The setting of the interlocking block and the interlocking plate determines whether the extrusion rod can contact the pipe. The interlocking plate slides on the processing bottom plate through the interlocking block, and it is ensured that there is no deviation during sliding. The interlocking slider is a component that controls the extrusion rod to move left and right. The sliding of the interlocking slider drives the sliding of the entire rotating disk, that is, the extrusion rod moves left and right in the pipe. The sliding of the sliding block controls the extrusion rod to move in a small range, so that the grinding position of the extrusion rod can be changed quickly and conveniently, thereby completing the adjustment of the annular groove depth and the groove spiral angle. And because the mounting seat is located in the mounting frame, the rotation of the rotating shaft drives the rotating disk to rotate on the sliding block, that is, the angle of the extrusion rod is changed, thereby realizing the multi-angle extrusion molding of the annular groove.

[0010] According to the above technical solution, the interlocking block is fixedly installed on the processing base plate, the interlocking plate is slidably connected to the processing base plate through the interlocking block, the interlocking slider is slidably connected to the interlocking plate, the rotating disk is rotatably connected to the interlocking slider, and the rotating disk is fixedly connected to the rotating shaft, and the rotating shaft is rotatably connected to the interlocking slider.

[0011] According to the above technical solution, the clamping block is fixedly installed on the top of the rotating disk, the sliding block is slidably connected to the rotating disk through the clamping block, the sliding block is welded to the mounting frame, the mounting seat is inserted into the mounting groove in the mounting frame, the mounting seat is connected to the top plate through a fastener, and the extrusion rod is clamped between the mounting seat and the top plate.

[0012] According to the above technical solution, a threaded rod is provided in the embedded slider, the threaded rod is rotatably connected to the embedded plate, and the threaded rod is threadedly connected to the embedded slider.

[0013] The present invention utilizes the rotation of the threaded rod to drive the movement of the embedded slider, which can ensure that the embedded slider will not move suddenly during the processing process, and this operation can be achieved by using an electric push rod or other hydraulic devices.

[0014] According to the above technical solution, the clamping unit includes a vertical plate, which is vertically installed on the operating base plate, and an empty groove is provided in the middle of the vertical plate, a limiting cylinder is provided at the empty groove, a limiting slide rail is opened in the limiting cylinder, an engaging block is provided on the limiting slide rail, an engaging groove is provided in the engaging block, an electric push rod is provided at the engaging groove, a limiting plate is provided at the other end of the electric push rod, the limiting plate is located at the engaging groove, an adjusting screw is provided on the limiting plate, and a clamping recess is provided at the end of the adjusting screw close to the limiting cylinder.

[0015] The adjusting screw is rotated to move the clamping block a certain distance, thereby driving the clamping block to clamp the pipe, avoiding the shaking and displacement of the pipe during the roll forming process, ensuring the normal operation of the processing, and the electric push rod in the mosaic block drives the limit plate to move horizontally, thereby clamping and fixing pipes of different lengths.

[0016] According to the above technical solution, the vertical plate is vertically fixed on the operating base plate, the limit cylinder is limit-installed in the empty groove, and the interlocking block is slidably connected to the limit cylinder through the limit slide rail, the interlocking block is slidably connected to the limit plate through the interlocking groove, the electric push rod is fixedly connected to the interlocking block and the limit plate, the limit plate is slidably connected to the interlocking block through the interlocking groove, the adjusting screw is threadedly connected to the limit plate, and the adjusting screw is connected to the clamping recess through a bearing.

[0017] According to the above technical solution, the linkage unit includes a linkage connecting plate, which is provided with two groups and respectively connected to two limit plates, a linkage rod is provided on the two linkage connecting plates, a cross bar is provided at the other end of the linkage rod, a drive shaft is provided in the middle of the cross bar, and a rotating motor is connected to the other end of the drive shaft, the rotating motor is located in a motor frame, a fixed arm is connected to the outer wall of the motor frame, and the fixed arm is connected to the vertical plate.

[0018] According to the above technical solution, the linkage connecting plate is located in the limiting slide rail, and the two linkage connecting plates are fixedly connected to the two limiting plates respectively, and the linkage rod is connected to the linkage connecting plate through fasteners, the linkage rod is connected to the cross bar through fasteners, the cross bar is fixedly connected to the drive shaft, the drive shaft is connected to the rotating motor through a coupling, the rotating motor is limitedly installed in the motor frame, the fixed arm is connected to the motor frame, and the fixed arm is installed on the vertical plate through fasteners.

[0019] In the present invention, the driving shaft is driven to rotate by a rotating motor, and then due to the connection relationship between the cross bar and the linkage rod, the two linkage connecting plates are driven to perform circular motion, and because the linkage connecting plates are located in the limiting slide rails and are fixedly connected to the limiting plates, the circular motion of the limiting plates is completed, and the clamped pipe is rotated in cooperation with the clamping recessed blocks, thereby completing the forming of the annular groove on the inner wall, greatly improving the processing efficiency.

[0020] According to the above technical scheme, the auxiliary limit unit includes a limit slide, which is located at the two ends of the interior of the installation frame, and a limit slide is provided in the limit slide, and limit clamping shaft ring blocks are symmetrically distributed at both ends of the limit slide, and a tight friction thread with a large friction coefficient is provided on the arc surface of the limit clamping shaft ring block close to the rotating shaft, and telescopic springs are symmetrically distributed between the two limit clamping shaft ring blocks, and a filling air bag is provided between the limit clamping shaft ring block and the inner wall of the installation frame.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. The present invention ensures that the entire adjustment unit will not be offset when processing close to the pipe by providing an embedded block in the adjustment unit, thereby ensuring the accuracy of processing and the sliding of the embedded slider drives the sliding of the entire rotating disk, that is, the extrusion rod is moved left and right in the pipe, and the sliding of the sliding block controls the extrusion rod to move in a small range, so that the grinding position of the extrusion rod can be changed quickly and conveniently, thereby completing the adjustment of the annular groove depth and the groove spiral angle.

[0022] 2. The present invention, by providing the linkage cooperation between the embedded block and the embedded sliding block in the adjustment unit and because the mounting seat is located in the mounting frame, the rotation of the rotating shaft drives the rotating disk to rotate on the sliding block, that is, the angle change of the extrusion rod is completed, thereby realizing the multi-angle extrusion molding of the annular groove, and after the filling airbag expands, the limit clamping shaft ring block in the auxiliary limit unit in the mounting frame moves toward each other so that the rotating shaft and the tight friction thread with a large friction coefficient set on the arc surface fit, so that after the angle of the extrusion rod is adjusted, there will be no accidental touch or the extrusion rod will be forced to rotate, which greatly ensures the stability of the extrusion rod during operation, and the set telescopic spring further fixes the limit again.

[0023] 3. The present invention, by providing a rotating adjusting screw in the clamping unit to make the clamping recess move a certain distance, thereby driving the clamping recess to clamp the pipe, avoiding the shaking and displacement of the pipe during the rolling forming process, ensuring the normal operation of the processing, and driving the limit plate to move horizontally through the electric push rod in the mosaic block, thereby achieving clamping and fixing of pipes of different lengths.

[0024] 4. The present invention, by arranging two linkage connecting plates in the linkage unit to perform circular motion under the driving force, completes the circular motion of the limit plate, cooperates with the clamping concave block to make the clamped pipe rotate, thereby completing the forming of the inner wall annular groove, greatly improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The present invention Figure 1 The structural diagram at A in the middle; Figure 3 It is a structural schematic diagram of the clamping unit of the present invention; Figure 4 It is a structural schematic diagram of the linkage unit of the present invention; Figure 5 It is a schematic diagram of the structure of the clamping unit of the present invention which is enlarged; Figure 6 It is a structural schematic diagram of the regulating unit of the present invention; Figure 7 It is a structural schematic diagram of the regulating unit part of the present invention; Figure 8 It is a structural analysis diagram of the auxiliary limiting unit in the installation frame of the present invention.

[0026] In the figure: 1, operating base plate; 201, interlocking block; 202, interlocking plate; 203, interlocking slider; 204, rotating disk; 205, clamping block; 206, sliding block; 207, mounting frame; 208, mounting seat; 209, top plate; 210, extrusion rod; 211, rotating shaft; 212, threaded rod; 301, vertical plate; 302, limiting cylinder; 303, limiting slide rail; 304, interlocking block; 305, limiting plate; 306, adjusting screw; 307, clamping concave block; 401, linkage connecting plate; 402, linkage rod; 403, cross bar; 404, driving shaft; 405, rotating motor; 406, motor frame; 407, fixed arm; 501, limiting slide; 502, limiting clamping shaft ring block; 503, telescopic spring; 504, filling airbag. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 8 , the present invention provides a technical solution: Example

[0029] A roll forming device for forming an annular groove on the inner wall of a pipe, comprising an operating base plate 1, on which a roll forming device is arranged, the roll forming device comprising an adjusting unit, a clamping unit and a linkage unit, wherein the adjusting unit and the clamping unit are both mounted on the operating base plate 1, and the linkage unit is mounted on the clamping unit; The adjustment unit includes an interlocking block 201, which is provided with two groups and respectively installed on both sides of the processing base plate 1. An interlocking plate 202 is provided on the two interlocking blocks 201, and a sliding groove is provided on the interlocking plate 202. An interlocking slider 203 is provided in the sliding groove. A rotating disk 204 is provided on the top of the interlocking slider 203, and a clamping block 205 is provided on the top of the rotating disk 204. The clamping block 205 is located on a sliding block 206.

[0030] A mounting frame 207 is provided on the top of the sliding block 206, a mounting groove is provided in the mounting frame 207, a mounting seat 208 is provided in the mounting groove, a top plate 209 is provided on the top of the mounting seat 208, an extrusion rod 210 is directly provided on the mounting seat 208 and the top plate 209, a rotating shaft 211 is provided on the top plate 209, the rotating shaft 211 passes through the mounting seat 208, the mounting frame 207 and the sliding block 206, and the other end of the rotating shaft 211 is connected to the rotating disk 204.

[0031] The arrangement of the engaging block 201 and the engaging plate 202 is a component that determines whether the extrusion rod 210 can contact the pipe. The engaging plate 202 slides on the processing bottom plate 1 through the engaging block 201, and ensures that no deviation occurs during sliding. The engaging slider 203 is a component that controls the extrusion rod 210 to move left and right. The sliding of the engaging slider 203 drives the sliding of the entire rotating disk 204, that is, the extrusion rod 210 moves left and right in the pipe. The sliding of the sliding block 206 controls the extrusion rod 210 to move in a small range, so that the grinding position of the extrusion rod 210 can be changed quickly and conveniently, thereby completing the adjustment of the annular groove depth and the groove spiral angle. And because the mounting seat 208 is located in the mounting frame 207, the rotation of the rotating shaft 211 drives the rotating disk 204 to rotate on the sliding block 206, that is, the angle of the extrusion rod 210 is changed, thereby realizing multi-angle extrusion molding of the annular groove.

[0032] The interlocking block 201 is fixedly mounted on the processing base plate 1, the interlocking plate 202 is slidably connected to the processing base plate 1 via the interlocking block 201, the interlocking slider 203 is slidably connected to the interlocking plate 202, the rotating disk 204 is rotatably connected to the interlocking slider 203, and the rotating disk 204 is fixedly connected to the rotating shaft 211, and the rotating shaft 211 is rotatably connected to the interlocking slider 203.

[0033] The clamping block 205 is fixedly installed on the top of the rotating disk 204, the sliding block 206 is slidably connected to the rotating disk 204 through the clamping block 205, the sliding block 206 is welded to the mounting frame 207, the mounting seat 208 is inserted into the mounting groove in the mounting frame 207, the mounting seat 208 is connected to the top plate 209 through fasteners, the extrusion rod 210 is clamped between the mounting seat 208 and the top plate 209, and an auxiliary limiting unit is provided in the mounting frame 207.

[0034] A threaded rod 212 is disposed inside the embedded slider 203 . The threaded rod 212 is rotatably connected to the embedded plate 202 . The threaded rod 212 is threadedly connected to the embedded slider 203 .

[0035] The present invention utilizes the rotation of the threaded rod 212 to drive the movement of the engaging slider 203, which can ensure that the engaging slider 203 will not move suddenly during the processing, and this operation can be achieved by using an electric push rod or other hydraulic devices.

[0036] The auxiliary limiting unit includes a limiting slide 501, which is located at both ends of the inside of the installation frame 207, and a limiting slide groove is provided in the limiting slide 501, and limiting clamping shaft ring blocks 502 are symmetrically distributed at both ends of the limiting slide groove. The limiting clamping shaft ring blocks 502 are provided with tight friction threads with a large friction coefficient on the arc surface close to the rotating shaft 211, and telescopic springs 503 are symmetrically distributed between the two limiting clamping shaft ring blocks 502, and a filling air bag 504 is provided between the limiting clamping shaft ring blocks 502 and the inner wall of the installation frame 207. Example

[0037] On the basis of Example 1: the clamping unit includes a vertical plate 301, which is vertically installed on the operating base plate 1, and an empty groove is provided in the middle of the vertical plate 301, a limiting cylinder 302 is provided at the empty groove, a limiting slide rail 303 is opened in the limiting cylinder 302, a fitting block 304 is provided on the limiting slide rail 303, a fitting groove is provided in the fitting block 304, an electric push rod is provided at the fitting groove, a limiting plate 305 is provided at the other end of the electric push rod, the limiting plate 305 is located at the fitting groove, an adjusting screw 306 is provided on the limiting plate 305, and a clamping recess 307 is provided at the end of the adjusting screw 306 close to the limiting cylinder 302.

[0038] The adjusting screw 306 is rotated to make the clamping recess 307 move a certain distance, thereby driving the clamping recess 307 to clamp the pipe, avoiding the shaking and displacement of the pipe during the rolling forming process, ensuring the normal operation of the processing, and the electric push rod in the mosaic block 304 drives the limit plate 305 to move horizontally, thereby achieving the clamping and fixation of pipes of different lengths.

[0039] The vertical plate 301 is vertically fixedly installed on the operating base plate 1, the limit cylinder 302 is limitedly installed in the empty groove, and the engaging block 304 is slidably connected to the limiting cylinder 302 through the limiting slide rail 303, the engaging block 304 is slidably connected to the limiting plate 305 through the engaging groove, the electric push rod is fixedly connected to the engaging block 304 and the limiting plate 305, the limiting plate 305 is slidably connected to the engaging block 304 through the engaging groove, the adjusting screw 306 is threadedly connected to the limiting plate 305, and the adjusting screw 306 is connected to the clamping recess 307 through a bearing. Example

[0040] On the basis of Example 1 and Example 2: the linkage unit includes a linkage connecting plate 401, which is provided with two groups and is respectively connected to the two limit plates 305, and a linkage rod 402 is provided on the two linkage connecting plates 401, and a cross bar 403 is provided at the other end of the linkage rod 402, and a driving shaft 404 is provided in the middle of the cross bar 403, and a rotating motor 405 is connected to the other end of the driving shaft 404, and the rotating motor 405 is located in a motor frame 406, and a fixed arm 407 is connected to the outer wall of the motor frame 406, and the fixed arm 407 is connected to the vertical plate 301.

[0041] The linkage connecting plate 401 is located in the limiting slide rail 303, and the two linkage connecting plates 401 are fixedly connected to the two limiting plates 305 respectively, and the linkage rod 402 is connected to the linkage connecting plate 401 through fasteners, the linkage rod 402 is connected to the cross bar 403 through fasteners, the cross bar 403 is fixedly connected to the driving shaft 404, the driving shaft 404 is connected to the rotating motor 405 through a coupling, the rotating motor 405 is limitedly installed in the motor frame 406, the fixed arm 407 is connected to the motor frame 406, and the fixed arm 407 is installed on the vertical plate 301 through fasteners.

[0042] In the present invention, the driving shaft 404 is driven to rotate by rotating the motor 405, and then due to the connection relationship between the cross bar 403 and the linkage rod 402, the two linkage connecting plates 401 are driven to perform circular motion, and because the linkage connecting plates 401 are located in the limiting slide rail 303 and are fixedly connected to the limiting plate 305, the circular motion of the limiting plate 305 is completed, and the clamped pipe is rotated in cooperation with the clamping recess 307, thereby completing the forming of the inner wall annular groove, greatly improving the processing efficiency.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for rolling annular grooves on the inner wall of a pipe, comprising an operating base plate (1), characterized in that: The operating base plate (1) is provided with a roll forming device, the roll forming device comprising an adjustment unit, a clamping unit and a linkage unit, the adjustment unit and the clamping unit are both mounted on the operating base plate (1), and the linkage unit is mounted on the clamping unit; The adjustment unit comprises a chimeric block (201), wherein the chimeric block (201) is provided in two groups and is respectively installed on two sides of the processing base plate (1), the two chimeric blocks (201) are provided with a chimeric plate (202), the chimeric plate (202) is provided with a sliding groove, a chimeric slider (203) is provided in the sliding groove, a rotating disk (204) is provided at the top of the chimeric slider (203), a clamping block (205) is provided at the top of the rotating disk (204), and the clamping block (205) is located on a sliding block (206).

2. The device for rolling forming an annular groove on the inner wall of a pipe according to claim 1, characterized in that: A mounting frame (207) is provided on the top of the sliding block (206), a mounting groove is provided in the mounting frame (207), a mounting seat (208) is provided in the mounting groove, a top plate (209) is provided on the top of the mounting seat (208), an extrusion rod (210) is directly provided on the mounting seat (208) and the top plate (209), a rotating shaft (211) is provided on the top plate (209), the rotating shaft (211) passes through the mounting seat (208), the mounting frame (207) and the sliding block (206), and the other end of the rotating shaft (211) is connected to the rotating disk (204).

3. The device for rolling annular grooves on the inner wall of a pipe according to claim 2, characterized in that: The engaging block (201) is fixedly mounted on the processing base plate (1); the engaging plate (202) is slidably connected to the processing base plate (1) via the engaging block (201); the engaging slider (203) is slidably connected to the engaging plate (202); the rotating disk (204) is rotatably connected to the engaging slider (203); the rotating disk (204) is fixedly connected to the rotating shaft (211); and the rotating shaft (211) is rotatably connected to the engaging slider (203).

4. The device for rolling forming annular grooves on the inner wall of a pipe according to claim 3, characterized in that: The clamping block (205) is fixedly mounted on the top of the rotating disk (204); the sliding block (206) is slidably connected to the rotating disk (204) via the clamping block (205); the sliding block (206) is welded to the mounting frame (207); the mounting seat (208) is plugged into a mounting groove in the mounting frame (207); the mounting seat (208) is connected to the top plate (209) via a fastener; the extrusion rod (210) is clamped between the mounting seat (208) and the top plate (209); and an auxiliary limiting unit is provided in the mounting frame (207).

5. The device for rolling forming annular grooves on the inner wall of a pipe according to claim 4, characterized in that: A threaded rod (212) is disposed inside the embedded sliding block (203); the threaded rod (212) is rotatably connected to the embedded plate (202); and the threaded rod (212) is threadably connected to the embedded sliding block (203).

6. The device for rolling forming annular grooves on the inner wall of a pipe according to claim 5, characterized in that: The clamping unit comprises a vertical plate (301), the vertical plate (301) being vertically mounted on the operating base plate (1), and a hollow groove being provided in the middle of the vertical plate (301), a limiting cylinder (302) being provided at the hollow groove, a limiting slide rail (303) being provided in the limiting cylinder (302), an engaging block (304) being provided on the limiting slide rail (303), an engaging groove being provided in the engaging block (304), an electric push rod being provided at the engaging groove, a limiting plate (305) being provided at the other end of the electric push rod, the limiting plate (305) being located at the engaging groove, an adjusting screw (306) being provided on the limiting plate (305), and a clamping recess (307) being provided at one end of the adjusting screw (306) close to the limiting cylinder (302).

7. The device for rolling forming annular grooves on the inner wall of a pipe according to claim 6, characterized in that: The vertical plate (301) is vertically fixedly mounted on the operating base plate (1); the limiting cylinder (302) is limitedly mounted at the empty slot; the engaging block (304) is slidably connected to the limiting cylinder (302) via a limiting slide rail (303); the engaging block (304) is slidably connected to the limiting plate (305) via an engaging groove; the electric push rod is fixedly connected to the engaging block (304) and the limiting plate (305); the limiting plate (305) is slidably connected to the engaging block (304) via the engaging groove; the adjusting screw (306) is threadedly connected to the limiting plate (305); and the adjusting screw (306) is connected to the clamping concave block (307) via a bearing.

8. The device for rolling annular grooves on the inner wall of a pipe according to claim 7, characterized in that: The linkage unit comprises linkage connecting plates (401), wherein two groups of linkage connecting plates (401) are provided and respectively connected to two limit plates (305), linkage rods (402) are provided on the two linkage connecting plates (401), a cross bar (403) is provided at the other end of the linkage rod (402), a driving shaft (404) is provided in the middle of the cross bar (403), and a rotating motor (405) is connected to the other end of the driving shaft (404), and the rotating motor (405) is located in a motor frame (406), and a fixed arm (407) is connected to the outer wall of the motor frame (406), and the fixed arm (407) is connected to the vertical plate (301).

9. The device for rolling forming annular grooves on the inner wall of a pipe according to claim 8, characterized in that: The linkage connecting plate (401) is located in the limiting slide rail (303), and the two linkage connecting plates (401) are fixedly connected to the two limiting plates (305) respectively, and the linkage rod (402) is connected to the linkage connecting plate (401) through a fastener, the linkage rod (402) is connected to the cross bar (403) through a fastener, the cross bar (403) is fixedly connected to the driving shaft (404), the driving shaft (404) is free-linked to the rotating motor (405) through a coupling, the rotating motor (405) is limitedly installed in the motor frame (406), the fixed arm (407) is connected to the motor frame (406), and the fixed arm (407) is installed on the vertical plate (301) through a fastener.

10. The device for rolling forming annular grooves on the inner wall of a pipe according to claim 4, characterized in that: The auxiliary limiting unit comprises a limiting slide (501), the limiting slide (501) being located at two ends inside the installation frame (207), and a limiting slide groove being provided inside the limiting slide (501), and limiting clamping shaft ring blocks (502) being symmetrically distributed at both ends of the limiting slide groove, and a tight friction thread with a large friction coefficient being provided on an arc surface of the limiting clamping shaft ring block (502) close to the rotating shaft (211), and a telescopic spring (503) being symmetrically distributed between the two limiting clamping shaft ring blocks (502), and a filling air bag (504) being provided between the limiting clamping shaft ring block (502) and the inner wall of the installation frame (207).

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