Pipe production forming device

Abstract

The invention discloses a pipe production forming device, and relates to the field of pipe machining, the pipe production forming device comprises a flaring assembly, the flaring assembly comprises a first flaring head and a second flaring head in sliding connection with the first flaring head, and the radial size of the first flaring head is smaller than that of the second flaring head; the flaring machine further comprises a power assembly used for driving the flaring assembly to move horizontally. When a pipe is flared, the power assembly firstly drives the first flaring head to independently perform primary flaring on the pipe, and then the power assembly drives the second flaring head to independently perform secondary flaring on the pipe. According to the pipe production forming device provided by the invention, the first flaring head and the second flaring head are connected in a sliding connection manner, so that a stepped opening is avoided during pipe flaring, and the overall strength during pipe connection is improved.

Description

Technical Field

[0001] The present invention relates to the field of pipe processing, and particularly to a pipe production and forming device. Background Art

[0002] As is well known, pipes are usually in a circular cylindrical structure. When connecting pipes, it is usually necessary to perform a flaring operation on the end position of the pipe (such as Figure 1 ), so that two adjacent pipes can be inserted into each other, making the pipe connection more convenient. At the same time, the sealing performance during connection can be improved. When flaring a pipe, when the pipe is flared from a smaller diameter to a larger diameter, in order to avoid damage to the pipe, multi-stage flaring of the pipe is required.

[0003] For example, in the Chinese patent document with the authorization announcement number CN221133794U, the announcement date of June 14, 2024, and the name of "A Stainless Steel Capillary Tube Reaming Device", it includes a bottom plate, and is characterized in that it further includes a fixing mechanism and a reaming mechanism; the fixing mechanism includes a pipe groove fixedly connected to the bottom plate, and a guide plate fixedly connected to the bottom plate is provided at one end of the pipe groove away from the center of the bottom plate; the reaming mechanism includes a fixing block fixedly connected to the bottom plate, the fixing block is fixedly connected to a first bearing seat, the first bearing seat is slidably connected to a reaming rod, and a multi-stage reaming assembly is fixedly connected to the end of the reaming rod close to the bottom plate. The outer diameter of the multi-stage reaming assembly gradually increases as the distance from the fixing mechanism increases. This patent is applicable to a stainless steel capillary tube reaming device. By the different diameters of different reaming heads in the multi-stage reaming assembly, the capillary tube can be effectively reamed, and capillary tubes with different pore diameters can be obtained according to actual needs.

[0004] The disadvantage of the above prior art is that when flaring and reaming a pipe, it is necessary to completely insert multiple reaming assemblies between the pipes to perform multi-stage flaring. This causes the front reaming assembly to perform multiple reamings, and finally an approximately multi-step-shaped pipe opening is obtained. When installing the pipe, the part of the pipe near the inner side that has been flared cannot be inserted into another pipe, which makes the side wall of the pipe at this position thinner and lacks internal support, thereby reducing the overall strength at this position. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipe production and forming device to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A pipe production and forming device includes a flaring assembly. The flaring assembly includes a first flaring head and a second flaring head slidably connected to the first flaring head. The radial dimension of the first flaring head is smaller than the radial dimension of the second flaring head;

[0008] It further includes a power component for driving the flaring component to move horizontally;

[0009] When flaring the pipe, the power component first drives the first flaring head to flare the pipe alone once, and then drives the second flaring head to flare the pipe alone for a second time through the power component.

[0010] The above-mentioned pipe production and forming device further includes a machine body. The second flaring head is slidably arranged on the machine body. A sliding groove adapted to the first flaring head is opened inside the second flaring head, and the first flaring head is slidably connected to the sliding groove.

[0011] The above-mentioned pipe production and forming device, the power component includes a hydraulic cylinder, a connecting block is arranged on the second flaring head, and the output end of the hydraulic cylinder is fixedly connected to the connecting block.

[0012] The above-mentioned pipe production and forming device, a transmission component is arranged between the first flaring head and the second flaring head for enabling the first flaring head and the second flaring head to move synchronously first and then enabling the second flaring head to move alone.

[0013] The above-mentioned pipe production and forming device, the transmission component includes a transmission rod slidably arranged on the first flaring head, and a transmission groove adapted to the transmission rod is opened on the second flaring head;

[0014] The transmission rod has a first position inserted into the transmission groove and a second position disengaged from the transmission groove.

[0015] The above-mentioned pipe production and forming device further includes a passive switching component for switching the transmission rod between the first position and the second position.

[0016] The above-mentioned pipe production and forming device, the passive switching component includes a first wedge-shaped part arranged on the transmission rod, a second wedge-shaped part is arranged on the machine body, the second wedge-shaped part is located on the movement stroke of the first wedge-shaped part, and a first elastic part is arranged between the transmission rod and the first flaring head.

[0017] The above-mentioned pipe production and forming device, a limiting part is arranged on the transmission rod.

[0018] The above-mentioned pipe production and forming device, the transmission rod further has a third position semi-inserted into the transmission groove.

[0019] The above-mentioned pipe production and forming device, a locking part is arranged between the transmission rod and the machine body for fixing the position of the first flaring head.

[0020] In the above technical solution, a pipe production and forming device provided by the present invention connects the first expanding head and the second expanding head in a sliding connection manner. When expanding the pipe, the power assembly first drives the first expanding head to expand the pipe alone once, and then drives the second expanding head to expand the pipe alone for a second time through the power assembly. While performing multi-stage expansion of the pipe, the existence of a stepped opening is avoided, thereby improving the overall strength during pipe connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the pipe expanding process provided by an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the operation process of the second expanding head provided by another embodiment of the present invention;

[0024] Figure 3 Cross-sectional structure schematic diagram when the transmission rod is in the first position provided by another embodiment of the present invention;

[0025] Figure 4 Cross-sectional structure schematic diagram when the transmission rod is in the second position provided by another embodiment of the present invention;

[0026] Figure 5 Cross-sectional structure schematic diagram when the transmission rod is in the third position provided by another embodiment of the present invention;

[0027] Figure 6 Cross-sectional structure schematic diagram provided by still another embodiment of the present invention.

[0028] Description of the reference numerals:

[0029] 1. First expanding head; 2. Second expanding head; 3. Machine body; 4. Sliding groove; 5. Sliding hole; 6. Connecting block; 7. Transmission rod; 8. Transmission groove; 9. First wedge portion; 10. Second wedge portion; 11. First elastic member; 12. Limiting portion; 13. Activity groove; 14. Locking portion; 15. Locking groove; 16. Oil storage cavity; 17. Extrusion block; 18. Second elastic member; 19. Oil supply channel; 20. Abutting rod; 21. T-shaped groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention, it should be understood that taking Figure 3 the position of the locking portion 14 relative to the locking groove 15 as left, and vice versa as right, the orientation or positional relationship indicated by the terms "center", "length", "width", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] Referring to Figures 1-6 , a pipe production and forming device provided by an embodiment of the present invention includes a flaring assembly. The flaring assembly includes a first flaring head 1 and a second flaring head 2 slidably connected to the first flaring head 1. The radial dimension of the first flaring head 1 is smaller than the radial dimension of the second flaring head 2. It further includes a power assembly for driving the horizontal movement of the flaring assembly. When flaring a pipe, the power assembly first drives the first flaring head 1 to flare the pipe once alone, and then drives the second flaring head 2 to flare the pipe a second time alone through the power assembly.

[0033] Specifically, the flaring assembly is composed of multiple flaring heads. The flaring heads are approximately cylindrical rod-shaped structures, and their ends are frustum-shaped. When the end of a pipe needs to be flared, the frustum end of the flaring head needs to be inserted into the hole of the pipe, and then power is provided by a hydraulic system to expand the end of the pipe from the inside to achieve flaring. When the size of the pipe to be expanded is large, for example, when expanding a pipe with a radius of 30 mm to a pipe with a radius of 60 mm, if the pipe is directly expanded to 60 mm, it is easy to damage the pipe. Therefore, multiple flaring heads are required, and the radial dimensions of the multiple flaring heads are different (it can be two flaring heads with radii of 45 mm and 60 mm respectively). First, the small-sized flaring head is inserted into the pipe, and then the large-sized flaring head is inserted into the pipe to achieve multiple expansions, so as to avoid damaging the pipe as much as possible. This is the prior art and will not be elaborated. One of the core innovations of the embodiment of the present invention is that the flaring assembly is divided into a first flaring head 1 and a second flaring head 2 that are slidably connected to each other. The first flaring head 1 is located inside the second flaring head 2, and the two are coaxially arranged. Moreover, the radial dimension of the first flaring head 1 is smaller than that of the second flaring head 2. The power assembly can be two oil cylinders, and the two oil cylinders control the first flaring head 1 and the second flaring head 2 respectively. The effect of such a setting is that when flaring the pipe, the power assembly first drives the first flaring head 1 to flare the pipe alone, and then drives the second flaring head 2 to flare the pipe alone for the second time. While performing multi-stage flaring on the pipe to avoid damaging the pipe as much as possible, the existence of a stepped opening is avoided, thereby improving the overall strength during pipe connection.

[0034] It should be noted that when the right end of the variable cross-section of the second flaring head 2 is in the same position as the left end of the variable cross-section of the first flaring head 1, the second expansion is completed.

[0035] Preferably, it further includes a machine body 3. The second flaring head 2 is slidably arranged on the machine body 3. A chute 4 adapted to the first flaring head 1 is opened inside the second flaring head 2, and the first flaring head 1 is slidably connected to the chute 4. Specifically, the machine body 3 is preferably a square structure, with an installation area provided inside it. Moreover, a sliding hole 5 adapted to the second flaring head 2 is opened on the side wall of the machine body 3, and the second flaring head 2 is slidably connected to the sliding hole 5 so that the second flaring head 2 can move horizontally relative to the machine body 3. A strip-shaped limiting block or the like for preventing relative rotation is provided between the first flaring head 1 and the chute 4 so that the first flaring head 1 can move horizontally inside the chute 4 but cannot rotate itself, and the end of the first flaring head 1 protrudes from the second flaring head 2.

[0036] It should be noted that when the protruding part of the first expanding head 1 is inserted into the interior of the pipe, the first expansion is completed. When the right end of the variable cross-section of the second expanding head 2 is in the same position as the left end of the variable cross-section of the first expanding head 1, the second expansion is completed.

[0037] Preferably, the power assembly includes a hydraulic cylinder (not shown). A connecting block 6 is provided on the second expanding head 2. The output end of the hydraulic cylinder is fixedly connected to the connecting block 6. Specifically, the hydraulic cylinder is disposed on the machine body 3. The connecting block 6 is disposed on the outer peripheral surface of the second expanding head 2 and is located below the second expanding head 2. The connecting block 6 is also slidably disposed in the machine body 3. Due to the limiting effect of the connecting block 6, the second expanding head 2 cannot rotate relative to the sliding hole 5. The kinetic energy provided by the telescopic movement of the output end of the hydraulic cylinder can be transmitted to the second expanding head 2 through the connecting block 6, so that the second expanding head 2 expands the pipe.

[0038] As another embodiment of the present invention, a transmission assembly is provided between the first expanding head 1 and the second expanding head 2 for synchronously moving the first expanding head 1 and the second expanding head 2 first and then moving the second expanding head 2 alone. Specifically, the transmission assembly can be a structure such as a plug. Jacks adapted to the plug are provided in the radial directions of both the first expanding head 1 and the second expanding head 2. When the power assembly drives the first expanding head 1 and the second expanding head 2 to move synchronously, the plug is inserted along the radial directions of the first expanding head 1 and the second expanding head 2 to connect the first expanding head 1 and the second expanding head 2 into a whole. Therefore, when the hydraulic cylinder drives the second expanding head 2 to move horizontally, it will drive the first expanding head 1 to move synchronously to perform the first expansion on the pipe. After the first expansion is completed, the plug is pulled out of the jack to separate the first expanding head 1 from the second expanding head 2. At this time, the telescopic movement of the hydraulic cylinder can only drive the second expanding head 2 to move alone (at this time, the first expanding head 1 stops inside the pipe), so that the second expanding head 2 moves to the position of the first expanding head 1 to perform the second expansion on the pipe. After the second expansion is completed, the plug is driven to be inserted into the jacks on the first expanding head 1 and the second expanding head 2 again. At this time, the output end of the hydraulic cylinder is controlled to contract so that the first expanding head 1 and the second expanding head 2 move synchronously to achieve their synchronous reset.

[0039] As an alternative to the plug and socket on the upper part for controlling the separation and combination of the first expansion head 1 and the second expansion head 2, preferably, the transmission assembly includes a transmission rod 7 slidably disposed on the first expansion head 1, and a transmission slot 8 adapted to the transmission rod 7 is formed on the second expansion head 2; the transmission rod 7 has a first position inserted into the transmission slot 8 and a second position separated from the transmission slot 8. Specifically, the transmission rod 7 is preferably L-shaped, the short side of the L shape is arranged along the radial direction of the first expansion head 1, the long side of the L shape is arranged along the axial direction of the first expansion head 1, and the first expansion head 1 is provided with a movable slot 13 for the transmission rod 7 to move along the radial direction. The transmission slot 8 is formed on the inner wall of the second expansion head 2 and is located on the movement stroke of the transmission rod 7. The effect of such a setting is that when the short side of the transmission rod 7 is inserted into the transmission slot 8, this is the first position of the transmission rod 7. At this time, the transmission rod 7 connects the first expansion head 1 and the second expansion head 2 into a whole. In this position, when the second expansion head 2 moves, it can drive the first expansion head 1 to move synchronously. When the transmission rod 7 is received into the movable slot 13, this is the second position of the transmission rod 7. At this time, the first expansion head 1 and the second expansion head 2 are separated and can move independently to realize the separation and combination of the first expansion head 1 and the second expansion head 2.

[0040] Further, it further includes a passive switching component for switching the transmission rod 7 between the first position and the second position. The passive switching component includes a first wedge portion 9 provided on the transmission rod 7, and a second wedge portion 10 is provided on the body 3. The second wedge portion 10 is located on the movement stroke of the first wedge portion 9, and a first elastic member 11 is provided between the transmission rod 7 and the first expansion head 1. Specifically, the first wedge portion 9 is provided on the surface of the long side of the transmission rod 7 away from the central axis of the first expansion head 1, and the second wedge portion 10 is provided at the edge position of the internal installation area of the body 3. The distance between the first wedge portion 9 and the second wedge portion 10 is equal to the displacement distance when the first expansion head 1 makes one expansion. The first elastic member 11 is preferably a spring, and the spring is arranged along the radial direction of the first expansion head 1. One end of the spring is fixedly connected to the inner wall of the moving groove 13, and the other end is fixedly connected to the long side of the transmission rod 7. The function of such a setting is that when the hydraulic cylinder drives the first expansion head 1 and the second expansion head 2 to move synchronously to perform one expansion, the first wedge portion 9 will be in contact with the second wedge portion 10, so that the first wedge portion 9 and the transmission rod 7 move towards the direction close to the central axis of the first expansion head 1, and store energy in the first elastic member 11, so that the short side of the transmission rod 7 is passively withdrawn from the transmission groove 8, so that the power of the second expansion head 2 cannot be transmitted to the first expansion head 1. In the subsequent telescopic process of the hydraulic cylinder, only the second expansion head 2 can be driven to move, so that when the second expansion head 2 makes a second expansion, the first expansion head 1 will not continue to move. After the second expansion head 2 finishes the second expansion, the hydraulic cylinder drives it to move in the reverse direction. When the transmission groove 8 overlaps with the short side of the transmission rod 7, at this time, an auxiliary mechanism can be used to drive the first expansion head 1 and the second expansion head 2 to move synchronously to the left. When the first wedge portion 9 and the second wedge portion 10 are separated, the elastic force of the first elastic member 11 is released, so that the short side of the transmission rod 7 is inserted into the transmission groove 8 to realize the reset of the transmission rod 7. When the second expansion head 2 continues to move to the left, it will drive the first expansion head 1 to move synchronously to realize the synchronous reset of the first expansion head 1 and the second expansion head 2.

[0041] Further, a limiting portion 12 is provided on the transmission rod 7. Specifically, the limiting portion 12 is provided at one end of the transmission rod 7 away from the transmission groove 8, and it forms a U-shaped structure with the transmission rod 7. After the first wedge portion 9 is in contact with the second wedge portion 10, the limiting portion 12 is in contact with the vertical surface above the second wedge portion 10, so that under the action of the transmission rod 7 and the limiting portion 12, the first expansion head 1 is limited to prevent the first expansion head 1 from continuing to move when the second expansion head 2 makes a second expansion alone.

[0042] As another embodiment of the present invention, the transmission rod 7 further has a third position in which it is semi-inserted into the transmission slot 8. Specifically, a wedge surface is provided at one end of the transmission rod 7 that is inserted into the transmission slot 8. For the convenience of description, when the transmission rod 7 is in the first position, the length of the left side surface of the short side of the transmission rod 7 located inside the transmission slot 8 is defined as the first distance, and the length of the right side surface of the long side of the transmission rod 7 located inside the transmission slot 8 is defined as the second distance. The vertical height difference of the first wedge portion 9 is between the first distance and the second distance. After the first wedge portion 9 abuts against the second wedge portion 10, the transmission rod 7 is in the third position, that is, the wedge surface of the transmission rod 7 is at the same height as the opening position of the transmission slot 8. The purpose of this setting is that during the first expansion, the transmission rod 7 is in the first position. At this time, the first expansion head 1 and the second expansion head 2 move synchronously. When the first expansion is completed, the first wedge portion 9 abuts against the second wedge portion 10, causing the transmission rod 7 to switch from the first position to the third position. When the second expansion head 2 continues to move, the opening position of the transmission slot 8 will abut against the wedge surface of the transmission rod 7, causing the transmission rod 7 to move in the direction of the central axis of the first expansion head 1, thereby passively switching the transmission rod 7 from the third position to the second position and storing energy in the first elastic member 11. In this position, only the second expansion head 2 performs the second expansion. The advantage of this setting is that after the pipe is expanded, the second expansion head 2 moves to the left. When the transmission slot 8 coincides with the short side of the transmission rod 7, the elastic force of the first elastic member 11 is released. At this time, the transmission rod 7 is passively switched from the second position to the third position. In this position, the vertical surface on the right side of the transmission rod 7 abuts against the right side wall of the transmission slot 8, so that the first expansion head 1 can be driven to move synchronously by the transmission rod 7 during the leftward movement of the second expansion head 2, thereby saving the above-mentioned steps of driving the first expansion head 1 to move leftward through the auxiliary structure to insert the transmission rod 7 into the transmission slot 8 to achieve reset. When the first wedge portion 9 and the second wedge portion 10 move away from each other, the elastic force of the first elastic member 11 is further released, causing the transmission rod 7 to be passively switched from the third position to the first position, so that the first expansion head 1 and the second expansion head 2 are reset synchronously.

[0043] Further, a locking member for fixing the position of the first flaring head 1 is provided between the transmission rod 7 and the machine body 3. The locking member includes a locking portion 14 provided on the transmission rod 7, and a locking groove 15 is provided inside the machine body 3. After the first flaring head 1 finishes flaring, the locking portion 14 is inserted into the locking groove 15. Specifically, the locking portion 14 is a convex structure on the axial center plane of the transmission rod 7 close to the first flaring head 1, and the locking groove 15 is opened in the installation area inside the machine body 3. The function of such a setting is that during the first flaring, the transmission rod 7 is in the first position. During the flaring process, it will drive the locking portion 14 to move near the opening of the locking groove 15. After the first flaring is completed, the transmission rod 7 is located at the third position switched from the first position. At this time, it will drive the locking portion 14 to move to the right and towards the direction of the first flaring head 1. When the limiting portion 12 abuts against the vertical surface above the second wedge portion 10, the position of the locking portion 14 coincides with the position of the locking groove 15. During the subsequent movement of the second flaring head 2, it will cause the transmission rod 7 to be passively switched from the third position to the second position (during this process, the end of the short side of the transmission rod 7 always abuts against the inner wall of the second flaring head 2 to keep the transmission rod 7 in the second position all the time). At this time, it will cause the transmission rod 7 to move towards the axial center of the first flaring head 1, so that the locking portion 14 is inserted into the locking groove 15, thereby the position of the first flaring head 1 can be passively locked through the transmission rod 7. After the second flaring is completed, drive the second flaring head 2 to move in the reverse direction. During this process, when the transmission groove 8 coincides with the transmission rod 7, the elastic force of the first elastic member 11 is released, which will drive the locking portion 14 to be withdrawn from the locking groove 15 to realize the passive unlocking of the first flaring head 1.

[0044] It should be noted that during the flaring process, in order to improve the success rate of flaring, a spraying assembly is provided at the end of the pipe to spray lubricating oil. As another embodiment of the present invention, an oil storage cavity 16 is formed inside the first flaring head 1. An extrusion block 17 is slidably arranged inside the oil storage cavity 16, and a second elastic member 18 is arranged between the extrusion block 17 and the first flaring head 1. An oil supply channel 19 is formed inside the first flaring head 1, and the oil supply channel 19 communicates with the oil storage cavity 16. An abutting rod 20 is arranged on the extrusion block 17, and an abutting portion is arranged inside the machine body 3, and the abutting portion is located on the moving stroke of the abutting rod 20. Specifically, lubricating oil is stored inside the oil storage cavity 16. One end of the oil supply channel 19 away from the oil storage cavity 16 is located at the end of the first flaring head 1. The overall structure among the extrusion block 17, the oil storage cavity 16, the second elastic member 18 and the oil supply channel 19 is similar to the existing perfume spraying mechanism. That is, when the extrusion block 17 is subjected to pressure, the lubricating oil inside the oil storage cavity 16 will be sprayed out through the oil supply pipeline, and then the extrusion block 17 will be automatically reset by driving of the second elastic member 18. The abutting rod 20 is fixedly connected to the left side surface of the extrusion block 17, and its cross section is preferably T-shaped. A T-shaped groove 21 adapted to the abutting rod 20 is formed inside the machine body 3, and the abutting rod 20 can slide inside the T-shaped groove 21. The abutting portion is the right side wall of the T-shaped groove 21. The purpose of such setting is that during one expansion, the first flaring head 1 will move to the right. When the first flaring head 1 approaches the end of the pipe, the vertical side of the abutting rod 20 abuts against the abutting portion, so that the abutting rod 20 and the extrusion block 17 cannot move further. Therefore, when the first flaring head 1 drives the oil storage cavity 16 to continue moving to the right, the extrusion block 17 will squeeze the space inside the oil storage cavity 16, so that the lubricating oil inside the oil storage cavity 16 is passively sprayed onto the inner wall of the pipe for lubrication. After the pipe is flared, the first flaring head 1 moves to the left. When the abutting rod 20 is away from the abutting portion, the elastic force of the second elastic member 18 is released to drive the extrusion block 17 to passively reset for the next flaring.

[0045] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A pipe production and forming device, comprising a flaring assembly, characterized in that: The flaring assembly comprises a first flaring head and a second flaring head slidably connected to the first flaring head, wherein the radial dimension of the first flaring head is smaller than the radial dimension of the second flaring head; Also included is a power assembly for driving the flaring assembly to move horizontally; When expanding the pipe, the power component first drives the first expanding head to expand the pipe once, and then drives the second expanding head to expand the pipe twice through the power component.

2. A pipe production and forming device according to claim 1, characterized in that: It also includes a machine body, a second expanding head is slidably arranged on the machine body, a sliding groove matched with the first expanding head is opened inside the second expanding head, and the first expanding head is slidably connected to the sliding groove.

3. A pipe production and forming device according to claim 1, characterized in that: The power assembly comprises a hydraulic cylinder, a connecting block is arranged on the second expansion head, and an output end of the hydraulic cylinder is fixedly connected to the connecting block.

4. A pipe production and forming device according to claim 2, characterized in that: A transmission component is arranged between the first expanding head and the second expanding head, and is used to make the first expanding head and the second expanding head move synchronously first and then make the second expanding head move alone.

5. A pipe production and forming device according to claim 4, characterized in that: The transmission assembly comprises a transmission rod slidably arranged on the first expansion head, and the second expansion head is provided with a transmission groove adapted to the transmission rod; The transmission rod has a first position in which the transmission rod is plugged into the transmission groove and a second position in which the transmission rod is disengaged from the transmission groove.

6. A pipe production and forming device according to claim 5, characterized in that: It also includes a passive switching component for switching the transmission rod between the first position and the second position.

7. A pipe production and forming device according to claim 6, characterized in that: The passive switching assembly includes a first wedge-shaped portion arranged on the transmission rod, a second wedge-shaped portion is arranged on the body, the second wedge-shaped portion is located on the movement stroke of the first wedge-shaped portion, and a first elastic member is arranged between the transmission rod and the first expansion head.

8. A pipe production and forming device according to claim 7, characterized in that: A limiting portion is arranged on the transmission rod.

9. A pipe production and forming device according to claim 5, characterized in that: The transmission rod also has a third position in which it is half-engaged with the transmission groove.

10. A pipe production and forming device according to claim 9, characterized in that: A locking piece for fixing the position of the first expansion head is provided between the transmission rod and the machine body; The locking member comprises a locking portion arranged on the transmission rod, a locking groove is arranged inside the body, and after the first expanding head is expanded, the locking portion is plugged into the locking groove.

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