Pipeline creased elbow connecting structure and preforming method thereof

Abstract

The invention relates to a pipeline creased elbow connecting structure and a preforming method thereof, and belongs to the technical field of creased elbows, the pipeline creased elbow connecting structure comprises a plurality of elbow joints connected in sequence, each elbow joint comprises a bent part, and flange parts are fixedly arranged at the two ends of each bent part; in the two flange parts on the same bent joint, one flange part is provided with a slot, the slot is a through slot, one side, far away from the bent part, of the other flange part is fixedly provided with a plurality of insertion strips, and the plurality of slots and the plurality of insertion strips are in one-to-one correspondence and are matched with each other; according to the invention, through the cooperation between the insertion end and the insertion groove, the radial positioning after the connection of the two bent joints is realized, and through the cooperation between the bending section and the groove, the axial positioning after the connection of the two bent joints is realized, so that the stability after the connection of the two bent joints is improved, and the preforming effect of the pipeline mitre bend is improved.

Description

Technical Field

[0001] The invention relates to a pipe shrimp bend connection structure and a preforming method thereof, belonging to the technical field of shrimp bends. Background Art

[0002] The shrimp elbow pipe is made of several sections of straight pipes spliced ​​together into an elbow pipe structure. Its shape resembles a shrimp, so it is called a shrimp elbow.

[0003] A Chinese utility model patent with the announcement number CN204353365U discloses a device for preforming ventilation duct shrimp bends. The device comprises at least a base, and at least three sets of crimpers and their brackets. The crimpers are fixedly connected to one end of the bracket, and the other end of the bracket is supported by the base. The at least three sets of crimpers and the brackets are arranged symmetrically around the center. The advantage of this utility model is that mechanical means can be used to replace manual operations, thereby reducing the labor intensity of the operator. The layout of the various mechanisms on the device is reasonable, and each mechanism can be independently disassembled and assembled, which facilitates the operator to quickly replace them when damaged or updated. The pneumatic crimping head has a good pre-pressing effect on the bend, and the connection strength between the two bends is effectively guaranteed. However, in the prior art, after the female end of the bend is pressed onto the male end of the bend, only radial positioning of the two bends can be achieved. The two bends are still prone to circumferential rotation. This rotation affects the stability of the crimping, thereby affecting the preforming effect.

[0004] Therefore, there is a need for a pipe shrimp bend connection structure and a preforming method thereof to improve the buckle stability and enhance the preforming effect. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the existing technology, a pipe shrimp bend connection structure and a preforming method thereof are provided to improve the stability of the buckle and enhance the preforming effect.

[0006] The technical solution adopted by the present invention to solve the above problems is: a pipe shrimp bend connection structure, comprising a plurality of bends connected in sequence, wherein the bends include a bend portion, and flange portions are fixedly provided at both ends of the bend portion; Of the two flanges on the same bend, one flange is provided with a slot, which is a through slot, and the other flange is fixed with an insert on a side away from the bend. There are multiple slots and multiple inserts, and the multiple slots and multiple inserts correspond to each other and match each other. The inserting strip includes an inserting section and a bending section, one end of the inserting section is fixedly connected to the flange portion, and the bending section is arranged at the other end of the inserting section; Of the two adjacent bending sections, the flange portion of one bending section provided with the inserting strip is coaxially fitted with the flange portion of the other bending section provided with the slot; In the two flange parts that fit together, the inserting section on one flange part is inserted into the slot on the other flange part, and the bending section on one flange part fits together with the side of the other flange part close to the bending part; The flange portion with the slot is concave near one end of the bending section, and there are multiple concave portions, which correspond one to one to multiple grooves. The concave portions form a groove, which is located on one side of the slot, and the groove matches the bending section, and the bending section is arranged in the groove.

[0007] Preferably, the insertion section and the bending section form a 7-shape.

[0008] A method for preforming a pipe shrimp bend is performed using a pipe shrimp bend preforming device, and specifically comprises the following steps: Step 1: The second motor is started to rotate the rotating shaft. The rotation of the rotating shaft drives the retaining rod to rotate through the rotating seat, so that the end of the retaining rod away from the rotating seat rotates upward, thereby providing space for placing the bending joint; Step 2: Place two bending sections, arrange them up and down, and fix them by a clamping mechanism; Step 2.1. Place the lower bending section so that the flange portion with the cutting strips is located above the flange portion with the grooves, and the bottom of the flange portion with the cutting strips is in contact with the top of each support plate; Step 2.2: Place the upper bend so that the flange with the cutting strips is located above the flange with the grooves, and the bottom of the flange with the grooves is aligned with the top of the flange with the cutting strips in the lower bend; The cuttings on the lower bend pass through the grooves on the upper bend, and the cuttings are now long strips; Step 2.3: Use the oil cylinder to drive the clamping blocks to move, so that the clamping blocks respectively abut against the outer peripheral wall of the flange portion of the lower bend with the insert provided thereon and the outer peripheral wall of the flange portion of the upper bend with the groove provided thereon. Since multiple clamping blocks are provided, the two bends are fixed, and the two abutting flange portions are coaxial with the vertical centerline of the base. Step 3: The second motor is started to rotate the rotating shaft in the opposite direction to reset the shaft, that is, to reset the retaining rod so that the roller abuts against the top of the flange portion with the groove on the upper bend; Step 4: The third motor is started, causing the driving gear to rotate the driven gear, thereby rotating the rotating ring. The rotation of the rotating ring drives the retaining assembly, that is, the roller to rotate around the vertical center line of the base. As the roller rotates, the roller bends the cutting strip, forming an insertion section and a bending section, and the bending section is pressed into the groove. At this time, the cutting strip forms a 7-shaped shape; After the roller rotates one circle around the vertical center line of the base, the two bending sections are preformed; Step 6: The second motor is started to rotate the rotating shaft. The rotation of the rotating shaft drives the retaining rod to rotate through the rotating seat, so that the end of the retaining rod away from the rotating seat rotates upward, thereby providing space for removing the bent section. Step 7: Use the oil cylinder to drive the clamping block to move in the opposite direction, separate the clamping block from the flange, and then take out the two preformed bends; Step 8: Repeat steps 1 to 7 to connect the two preformed bends with the next bend until all bends are connected.

[0009] Preferably, the pipe shrimp bend preforming equipment comprises a base, on which a pressing mechanism and a clamping mechanism are provided, wherein a plurality of clamping mechanisms are provided, and the plurality of clamping mechanisms are circumferentially distributed with the vertical center line of the base as the center, and the two bending sections are fixed by the clamping mechanism, and the pressing mechanism is used to connect the two bending sections; The buckling mechanism includes a buckling assembly and a rotating assembly, wherein the rotating assembly is connected to the buckling assembly and the buckling assembly is driven by the rotating assembly to rotate around the vertical center line of the base; The detent assembly includes a detent rod and a rotating shaft, the detent rod and the rotating shaft are arranged at an angle, one end of the rotating shaft is rotatably connected to one end of the detent rod through a rotating seat, and the other end of the rotating shaft is driven by a second motor.

[0010] Preferably, the clamping mechanism includes a movable seat, which is connected to a movable module, and the movable seat is driven by the movable module to move horizontally toward or away from the vertical center line of the base. A support plate is fixed on the movable seat, and a clamping block is provided above the support plate. The clamping block is driven to move by a cylinder.

[0011] Preferably, the movable module includes a screw, which passes through the movable seat and is threadedly connected to the movable seat. The circumference of the screw is perpendicular to and intersects with the vertical center line of the base. One end of the screw is connected to a driving source, which is a first motor.

[0012] Preferably, a plurality of guide grooves are provided on the base, the plurality of guide grooves correspond one-to-one to the plurality of movable seats, and the movable seats are slidably connected to the guide grooves.

[0013] Preferably, the retaining rod and the rotating shaft are both arranged horizontally, the axis of the retaining rod is perpendicular to and intersects with the vertical center line of the base, and the axis of the rotating shaft is perpendicular to and intersects with the axis of the retaining rod.

[0014] Preferably, a roller is installed on the end of the retaining rod away from the rotating seat.

[0015] Preferably, the rotating assembly includes a fixed ring and a rotating ring, the axis of the fixed ring coincides with the vertical center line of the base, the fixed ring is fixedly connected to the base, the rotating ring and the fixed ring are coaxially arranged, the fixed ring and the rotating ring are arranged from inside to outside, the rotating ring is rotatably connected to the fixed ring through a bearing, a driven gear is installed on the outer peripheral wall of the fixed ring, a driving gear is engaged with the driven gear, and the driving gear is driven by a third motor, the housing of the third motor is fixedly connected to the fixed ring, and the housing of the second motor is fixedly connected to the rotating ring.

[0016] Compared with the prior art, the advantages of the present invention are: The present invention provides a pipe shrimp bend connection structure and a preforming method thereof, which realizes radial positioning of the two bend sections after connection through cooperation between the insertion end and the slot, and realizes axial positioning of the two outer diameters after connection through cooperation between the bending section and the groove, thereby improving the stability of the two bend sections after connection and enhancing the pipe shrimp bend preforming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the connection structure after the two bending sections are connected; Figure 2 for Figure 1 A top view of Figure 3 for Figure 2 AA direction cross-sectional view; Figure 4 It is a three-dimensional diagram of the bending section; Figure 5 It is a top view of the bending section; Figure 6 for Figure 5 BB direction cross-sectional view; Figure 7 Schematic diagram of the connection structure of the two bending joints in step 2; Figure 8 for Figure 7 A top view of Figure 9 for Figure 8 CC direction cross-sectional view; Figure 10 This is a structural diagram of a pipe shrimp bend preforming equipment; Figure 11 Schematic diagram of the connection structure between the base and the clamping mechanism; Figure 12 It is a structural diagram of the clamping mechanism; Figure 13 Schematic diagram of the structure of the seizure component.

[0018] in: Bend 1; Bending portion 11, flange portion 12, slot 13, insert 14, groove 15; Insertion section 141, bending section 142; Base 100, pressing mechanism 200, clamping mechanism 300; Seizing component 201, rotating component 202; Detention rod 201.1, rotating shaft 201.2, rotating seat 201.3, second motor 201.4, roller 201.5; Fixed ring 202.1, rotating ring 202.2, bearing 202.3, driven gear 202.4, driving gear 202.5, third motor 202.6; Moving seat 301 , supporting plate 302 , clamping block 303 , oil cylinder 304 , lead screw 305 , first motor 306 , guide groove 307 . DETAILED DESCRIPTION

[0019] like Figures 1-13 As shown, a pipe shrimp bend connection structure in this embodiment includes a plurality of bend sections 1 connected in sequence, wherein the bend section 1 includes a bend portion 11, and flange portions 12 are fixedly provided at both ends of the bend portion 11; Of the two flanges 12 on the same bend 1, one flange 12 is provided with a slot 13, which is a through slot. A plug 14 is fixedly provided on the side of the other flange 12 away from the bend 11. There are multiple slots 13 and multiple plugs 14, and the multiple slots 13 and the multiple plugs 14 correspond to each other and match each other. The inserting strip 14 includes an inserting section 141 and a bending section 142. One end of the inserting section 141 is fixedly connected to the flange portion 12, and the bending section 142 is provided at the other end of the inserting section 141. The inserting section 141 and the bending section 142 form a 7-shape. Of the two adjacent bent sections 1, the flange portion 12 of one bent section 1 with the insert 14 is coaxially fitted with the flange portion 12 of the other bent section 1 with the slot 13; Of the two flanges 12 that fit together, the inserting section 141 on one flange 12 is inserted into the slot 13 on the other flange 12, and the bending section 142 on one flange 12 fits against a side of the other flange 12 that is close to the bending section 11. The flange portion 12 having the slot 13 is concave at one end thereof close to the bent section 142. The flange portion 12 has a plurality of concave portions, each corresponding to a plurality of grooves 15. The concave portions form a groove 15, which is located on one side of the slot 13. The groove 15 matches the bent section 142, and the bent section 142 is disposed in the groove 15. Here, the radial positioning of the two bending sections 1 after connection is achieved through the cooperation between the insertion end and the slot 13, and the axial positioning of the two outer diameters after connection is achieved through the cooperation between the bending section 142 and the groove 15, thereby improving the stability of the two bending sections 1 after connection and enhancing the preforming effect of the pipe shrimp bend; A pipe shrimp bend preforming device includes a base 100, on which a pressing mechanism 200 and a clamping mechanism 300 are provided. The clamping mechanism 300 is provided in plurality, and the plurality of clamping mechanisms 300 are evenly distributed circumferentially with the vertical center line of the base 100 as the center. The specific number of the clamping mechanisms 300 is three, and the two bending sections 1 are fixed by the clamping mechanism 300. The pressing mechanism 200 is used to connect the two bending sections 1. The clamping mechanism 300 includes a movable base 301, to which a movable module is connected. The movable base 301 is driven by the movable module to move horizontally toward or away from the vertical center line of the base 100. A support plate 302 is fixedly provided on the movable base 301, and a clamping block 303 is provided above the support plate 302. The clamping block 303 is driven to move by a cylinder 304. The movable module includes a lead screw 305, which passes through the movable base 301 and is threadedly connected to the movable base 301. The circumferential direction of the lead screw 305 is perpendicular to and intersects with the vertical center line of the base 100. One end of the lead screw 305 is connected to a driving source, wherein the driving source is a first motor 306. The top of the base 100 is provided with a plurality of guide grooves 307 , and the plurality of guide grooves 307 correspond one to one with the plurality of movable seats 301 , and the movable seats 301 are slidably connected to the guide grooves 307 ; The buckling mechanism 200 is located above the clamping mechanism 300 and includes a buckling assembly 201 and a rotating assembly 202. The rotating assembly 202 is connected to the buckling assembly 201 and drives the buckling assembly 201 to rotate around the vertical centerline of the base 100 through the rotating assembly 202. The detaining assembly 201 includes a detaining rod 201.1 and a rotating shaft 201.2. The detaining rod 201.1 and the rotating shaft 201.2 are arranged at an angle. Specifically, the detaining rod 201.1 and the rotating shaft 201.2 are both arranged horizontally. The axis of the detaining rod 201.1 is perpendicular to and intersects with the vertical center line of the base 100. The axis of the rotating shaft 201.2 is perpendicular to and intersects with the axis of the detaining rod 201.1. One end of the rotating shaft 201.2 is rotatably connected to one end of the detaining rod 201.1 via a rotating seat 201.3. The other end of the rotating shaft 201.2 is driven by a second motor 201.4. The end of the detent rod 201.1 away from the rotating seat 201.3 is equipped with a roller 201.5; The rotating assembly 202 includes a fixed ring 202.1 and a rotating ring 202.2. The axis of the fixed ring 202.1 coincides with the vertical center line of the base 100. The fixed ring 202.1 is fixedly connected to the base 100. The rotating ring 202.2 is coaxially arranged with the fixed ring 202.1. The fixed ring 202.1 and the rotating ring 202.2 are arranged from the inside to the outside. The rotating ring 202.2 is rotatably connected to the fixed ring 202.1 via a bearing 202.3. A driven gear 202.4 is mounted on the outer peripheral wall of the fixed ring 202.1. A driving gear 202.5 is meshed with the driven gear 202.4. The driving gear 202.5 is driven by a third motor 202.6. The housing of the third motor 202.6 is fixedly connected to the fixed ring 202.1. The housing of the second motor 201.4 is fixedly connected to the rotating ring 202.2. A method for preforming a pipe shrimp bend is performed using a pipe shrimp bend preforming device, and specifically comprises the following steps: Step 1: Start the second motor 201.4 to rotate the rotating shaft 201.2. The rotation of the rotating shaft 201.2 drives the retaining rod 201.1 to rotate through the rotating base 201.3, so that the end of the retaining rod 201.1 away from the rotating base 201.3 rotates upward, thereby providing space for the bending section 1. Step 2: Place two bending sections 1, arrange the two bending sections 1 up and down, and fix the two bending sections 1 by a clamping mechanism 300; Step 2.1, place the lower bending section 1, with the flange portion 12 provided with the cutting strip 14 positioned above the flange portion 12 provided with the groove 15, and the bottom of the flange portion 12 provided with the cutting strip 14 is in contact with the top of each support plate 302; Step 2.2: Place the upper bending section 1, with the flange 12 having the insert 14 positioned above the flange 12 having the groove 15, and with the bottom of the flange 12 having the groove 15 aligned with the top of the flange 12 having the insert 14 in the lower bending section 1; The cutting strip 14 on the lower bend 1 passes through the groove 15 on the upper bend 1. At this time, the cutting strip 14 is in the shape of a long strip. Step 2.3: Use the oil cylinder 304 to drive the clamping block 303 to move, so that the clamping block 303 respectively abuts against the outer peripheral wall of the flange portion 12 of the lower bending section 1 provided with the insert 14 and the outer peripheral wall of the flange portion 12 of the upper bending section 1 provided with the groove 15. Since multiple clamping blocks 303 are provided, the two bending sections 1 are fixed, and the two abutting flange portions 12 are coaxial with the vertical center line of the base 100; Here, in order to adapt to different sizes of the elbow 1, the moving base 100 is moved by moving the module drive, specifically, the first motor 306 is started to rotate the lead screw 305, so as to move the moving seat 301, and the moving of the moving seat 301 drives the synchronous movement of the support plate 302; Step 3, the second motor 201.4 is started to rotate the rotating shaft 201.2 in the reverse direction to realize resetting, that is, the resetting of the clamping rod 201.1, so that the roller 201.5 abuts against the top of the flange part 12 of the upper elbow 1 provided with the groove 15; Step 4, the third motor 202.6 is started to rotate the driving gear 202.5 to drive the driven gear 202.4, so as to rotate the rotating ring 202.2, the rotating of the rotating ring 202.2 drives the clamping assembly 201, that is, drives the roller 201.5 to rotate around the vertical center line of the base 100, with the rotation of the roller 201.5, the roller 201.5 bends the insertion strip 14 to realize that the insertion strip 14 forms the insertion section 141 and the bending section 142, and the bending section 142 is pressed into the groove 15, at this time, the insertion strip 14 forms a 7-shaped type; After the roller 201.5 rotates around the vertical center line of the base 100 for one circle, the two elbows 1 are preformed; Step 6, the second motor 201.4 is started to rotate the rotating shaft 201.2, and the rotating of the rotating shaft 201.2 drives the clamping rod 201.1 through the rotating seat 201.3 to rotate the end of the clamping rod 201.1 away from the rotating seat 201.3 upward, so as to provide space for taking out the elbow 1; Step 7, after the clamping block 303 is separated from the flange part 12 by the reverse movement of the clamping block 303 driven by the oil cylinder 304, the two elbows 1 preformed are taken out; Step 8, repeat steps 1 to 7 to connect the two elbows 1 preformed with the next elbow 1 until all the elbows 1 are connected.

[0020] In addition to the above-mentioned embodiments, the present application also includes other implementation manners, and any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present application.

Claims

1. A pipe shrimp bend connection structure, comprising a plurality of bends (1) connected in sequence, characterized in that: The bending section (1) comprises a bending portion (11), and flange portions (12) are fixedly provided at both ends of the bending portion (11); Of the two flanges (12) on the same bending section (1), one flange (12) is provided with a slot (13), the slot (13) being a through slot, and the other flange (12) is fixedly provided with an insert (14) on a side away from the bending section (11), and a plurality of slots (13) and inserts (14) are provided, and the plurality of slots (13) and the plurality of inserts (14) correspond to and match one by one; The inserting strip (14) comprises an inserting section (141) and a bending section (142), one end of the inserting section (141) is fixedly connected to the flange portion (12), and the bending section (142) is arranged at the other end of the inserting section (141); In two adjacent bending sections (1), a flange portion (12) provided with an insert (14) on one bending section (1) is coaxially fitted with a flange portion (12) provided with a slot (13) on the other bending section (1); In the two flange parts (12) that fit together, the insertion section (141) on one flange part (12) is inserted into the slot (13) on the other flange part (12), and the bending section (142) on one flange part (12) fits together with a side of the other flange part (12) close to the bending part (11); The flange portion (12) provided with the slot (13) is concave at one end close to the bending section (142), and a plurality of the concave portions are provided, and the plurality of concave portions correspond one to one with the plurality of grooves (15). The concave portions form a groove (15), and the groove (15) is located on one side of the slot (13). The groove (15) matches the bending section (142), and the bending section (142) is arranged in the groove (15).

2. The pipe shrimp bend connection structure according to claim 1, characterized in that: The insertion section (141) and the bending section (142) form a 7-shape.

3. A method for preforming a pipe shrimp bend, characterized by: A pipe shrimp bend preforming equipment is used for the operation, which specifically includes the following steps: Step 1: The second motor (201.4) is started to rotate the rotating shaft (201.2). The rotation of the rotating shaft (201.2) drives the retaining rod (201.1) to rotate via the rotating seat (201.3), so that the end of the retaining rod (201.1) away from the rotating seat (201.3) rotates upward, thereby providing space for placing the bending joint (1); Step 2: placing two bending sections (1), arranging the two bending sections (1) up and down, and fixing the two bending sections (1) by a clamping mechanism (300); Step 2.1, placing the lower bending section (1), with the flange portion (12) provided with the insert (14) positioned above the flange portion (12) provided with the groove (15), and the bottom of the flange portion (12) provided with the insert (14) being in contact with the top of each support plate (302); Step 2.2, placing the upper bending section (1), with the flange portion (12) provided with the insert (14) positioned above the flange portion (12) provided with the groove (15), and the bottom of the flange portion (12) provided with the groove (15) being in contact with the top of the flange portion (12) provided with the insert (14) in the lower bending section (1); The cutting strip (14) on the lower bending section (1) passes through the groove (15) on the upper bending section (1), and the cutting strip (14) is now in the shape of a long strip; Step 2.3, the clamping block (303) is driven to move by the oil cylinder (304), so that the clamping block (303) respectively abuts against the outer peripheral wall of the flange portion (12) provided with the insert (14) in the lower bend (1) and the outer peripheral wall of the flange portion (12) provided with the groove (15) in the upper bend (1). Since a plurality of clamping blocks (303) are provided, the two bends (1) are fixed, and the two affixed flange portions (12) are in a coaxial state with the vertical center line of the base (100); Step 3: The second motor (201.4) is started to rotate the rotating shaft (201.2) in the opposite direction to achieve reset, that is, reset the retaining rod (201.1), so that the roller (201.5) abuts against the top of the flange portion (12) of the upper bending section (1) provided with a groove (15); Step 4: The third motor (202.6) is started, causing the driving gear (202.5) to drive the driven gear (202.4) to rotate, thereby causing the rotating ring (202.2) to rotate. The rotation of the rotating ring (202.2) drives the retaining assembly (201), that is, drives the roller (201.5) to rotate around the vertical center line of the base (100). As the roller (201.5) rotates, the roller (201.5) bends the insert (14), so that the insert (14) forms an insertion section (141) and a bending section (142), and the bending section (142) is pressed into the groove (15). At this time, the insert (14) forms a 7-shaped shape. After the roller (201.5) rotates once around the vertical center line of the base (100), the two bending sections (1) are preformed; Step 6: The second motor (201.4) is started to rotate the rotating shaft (201.2). The rotation of the rotating shaft (201.2) drives the retaining rod (201.1) to rotate via the rotating seat (201.3), so that the end of the retaining rod (201.1) away from the rotating seat (201.3) rotates upward, thereby providing space for removing the bent section (1); Step 7: The clamping block (303) is driven to move in the reverse direction by the oil cylinder (304), so that the clamping block (303) is separated from the flange portion (12), and the two preformed bent sections (1) are taken out; Step 8: Repeat steps 1 to 7 to connect the two preformed bends (1) with the next bend (1) until all bends (1) are connected.

4. A method for preforming a pipe shrimp bend according to claim 3, characterized in that: The pipe shrimp bend preforming device comprises a base (100), wherein a pressing mechanism (200) and a clamping mechanism (300) are provided on the base (100), wherein a plurality of clamping mechanisms (300) are provided, and the plurality of clamping mechanisms (300) are circumferentially distributed with the vertical center line of the base (100) as the center, and the two bending sections (1) are fixed by the clamping mechanism (300), and the pressing mechanism (200) is used to connect the two bending sections (1); The detent mechanism (200) comprises a detent assembly (201) and a rotating assembly (202), wherein the rotating assembly (202) is connected to the detent assembly (201), and the detent assembly (201) is driven by the rotating assembly (202) to rotate around the vertical center line of the base (100); The detaining assembly (201) comprises a detaining rod (201.1) and a rotating shaft (201.2); the detaining rod (201.1) and the rotating shaft (201.2) are arranged at an angle; one end of the rotating shaft (201.2) is rotatably connected to one end of the detaining rod (201.1) via a rotating seat (201.3); and the other end of the rotating shaft (201.2) is driven by a second motor (201.4).

5. A method for preforming a pipe shrimp bend according to claim 4, characterized in that: The clamping mechanism (300) includes a movable seat (301), a movable module connected to the movable seat (301), and the movable seat (301) is driven by the movable module to move horizontally toward or away from the vertical center line of the base (100). A support plate (302) is fixedly provided on the movable seat (301), and a clamping block (303) is provided above the support plate (302). The clamping block (303) is driven to move by a cylinder (304).

6. A method for preforming a pipe shrimp bend according to claim 5, characterized in that: The movable module comprises a lead screw (305), the lead screw (305) passes through the movable seat (301), the lead screw (305) is threadedly connected to the movable seat (301), the circumference of the lead screw (305) is perpendicular to and intersects with the vertical center line of the base (100), and one end of the lead screw (305) is connected to a driving source, which is a first motor (306).

7. A method for preforming a pipe shrimp bend according to claim 4, characterized in that: A plurality of guide grooves (307) are provided on the base (100), and the plurality of guide grooves (307) correspond one-to-one to the plurality of movable seats (301), and the movable seats (301) are slidably connected to the guide grooves (307).

8. The method for preforming a pipe shrimp bend according to claim 4, characterized in that: The detent rod (201.1) and the rotating shaft (201.2) are both arranged horizontally; the axis of the detent rod (201.1) is perpendicular to and intersects with the vertical center line of the base (100); and the axis of the rotating shaft (201.2) is perpendicular to and intersects with the axis of the detent rod (201.1).

9. The method for preforming a pipe shrimp bend according to claim 4, characterized in that: A roller (201.5) is mounted on one end of the detaining rod (201.1) away from the rotating seat (201.3).

10. The method for preforming a pipe shrimp bend according to claim 4, characterized in that: The rotating assembly (202) comprises a fixed ring (202.1) and a rotating ring (202.2), the axis of the fixed ring (202.1) coincides with the vertical center line of the base (100), the fixed ring (202.1) is fixedly connected to the base (100), the rotating ring (202.2) is coaxially arranged with the fixed ring (202.1), the fixed ring (202.1) and the rotating ring (202.2) are arranged from inside to outside, and the rotating ring (202.2) is supported by a bearing (202. 3) is rotationally connected to the fixed ring (202.1), a driven gear (202.4) is mounted on the outer peripheral wall of the fixed ring (202.1), a driving gear (202.5) is meshed with the driven gear (202.4), and the driving gear (202.5) is driven by a third motor (202.6), the housing of the third motor (202.6) is fixedly connected to the fixed ring (202.1), and the housing of the second motor (201.4) is fixedly connected to the rotating ring (202.2).

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