A method of forming a helical tube space bend

Abstract

The present application relates to a kind of helical pipe space elbow forming method, comprising the following steps: the end section of helical pipe that has completed helical section bending is fixed on forming mould, when swing arm is in zero position, counterweight cylinder actuation balances the weight of lifting arm;Follow-up cylinder pushes spherical die and presses the end section of helical pipe on forming mould, then swing arm starts to rotate, spherical die follows the form of space forming groove or plane forming groove of forming mould and follow-up lifting, while spherical die also follows space forming groove or plane forming groove and angle transformation;Stop after rotating to suitable overbend angle, and the space bend or plane bend of end section is completed.The helical pipe space elbow forming method provided by the present application not only can complete helical pipe space elbow, but also is convenient to operate, flexible to adjust, can guarantee product performance, outer diameter wall thickness size, parallelism with helical section center axis, deformation section size precision and shape position precision and surface quality.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for forming a spiral pipe spatial bend, in particular a method for forming a spiral pipe spatial bend. BACKGROUND

[0002] With the development of nuclear power technology, miniaturization, multipurpose and modularization are developed. In order to ensure the maximum heat exchange area and heat exchange effect in the limited evaporator space, and to facilitate manufacturing and assembly, the spatial bend of the spiral pipe also presents various forms according to different design concepts. Based on the requirements of manufacturing and assembly, the size accuracy, shape and position accuracy and surface quality of the spatial bend are very high. The conventional coil pipe machine cannot realize the combination of spiral pipe plane bending and spatial bending, such as the push-bending forming method and mechanism of a spatial spiral coil pipe with a straight section disclosed in Chinese patent CN104923599A. The mechanism can make the pipe bending machine produce coil pipes with different spiral diameters and spiral angles, that is, it can only be used for the production of spiral pipes and cannot complete the production of spatial bend pipes. Therefore, how to realize the forming of the spatial bend combination form is a problem to be solved. SUMMARY

[0003] To solve the above problems, the present application provides a method for forming a spiral pipe spatial bend which can complete complex spatial bend pipes, and the specific technical scheme is as follows:

[0004] A method for forming a spiral pipe spatial bend, comprising the following steps: fixing the end section of the spiral pipe which has completed spiral section bending on a forming die, at this time the swing arm is in zero position, the counterweight cylinder acts to balance the weight of the lifting arm; the follow-up cylinder pushes the spherical pressing die to press the end section of the spiral pipe on the forming die, then the swing arm starts to rotate, the spherical pressing die follows the form of the spatial forming groove or the plane forming groove of the forming die to follow-up lifting, at the same time the spherical pressing die also follows the spatial forming groove or the plane forming groove to change the angle; stop after rotating to the appropriate bending angle, the spatial bend or the plane bend of the end section is completed.

[0005] Preferably, after the spatial forming groove completes the spatial bend, the plane forming groove is replaced, a straight pipe is translated first, a first 90-degree bend is bent, a straight pipe is translated again, a second 90-degree bend is bent, and the final straight section is parallel to the cylindrical surface of the spiral section.

[0006] Preferably, after the plane forming groove completes the plane bend, the spatial forming groove is replaced, and the pipe is fixed again, at this time the swing arm is in zero position, the counterweight cylinder acts to balance the weight of the lifting arm; the follow-up cylinder pushes the spherical pressing die to press the pipe on the forming die, then the swing arm starts to rotate, the spherical pressing die follows the form of the spatial forming groove or the plane forming groove of the forming die to follow-up lifting, at the same time the spherical pressing die also follows the spatial forming groove or the plane forming groove to change the angle; stop after rotating to the appropriate bending angle, the spatial bend of the pipe is completed.

[0007] Preferably, the forming die comprises a space bending die and a plane bending die; the plane forming groove is arranged on the plane bending die, and the plane forming groove comprises a plane fixed groove, a plane bending groove and a plane over-bending groove arranged in sequence along the outer circumferential surface of the plane bending die; the space forming groove is arranged on the space bending die, and the space forming groove comprises an auxiliary bending groove, a forming bending groove and a space over-bending groove arranged in sequence along the outer circumferential surface of the space bending die.

[0008] Preferably, the spherical compression die is provided with an annular compression groove.

[0009] Preferably, the spherical compression die is connected with a follow-up compression device through a lifting device, the follow-up compression device is installed on a swing arm, and the swing arm is installed on a rotating device.

[0010] Further, the rotating device comprises a rotating frame, a swing shaft which is rotatably installed on the rotating frame, a swing frame which is fixed on the swing shaft and connected with the swing arm, a speed reducer which is connected with the swing shaft, and a motor which is connected with the speed reducer.

[0011] Further, the follow-up compression device comprises a follow-up seat which is slidably installed on the swing arm, and a follow-up cylinder which is installed on the swing arm and connected with the follow-up seat.

[0012] Further, the lifting device comprises a lifting seat which is slidably installed on the follow-up compression device, a lifting arm which is slidably installed on the lifting seat, and a counterweight cylinder which is fixed on the lifting seat and connected with the bottom of the lifting arm.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] The forming method of the spiral pipe space bending device provided by the present application not only can complete the space bending of the spiral pipe, but also is convenient to operate and flexible to adjust, and can guarantee the product performance, the outer diameter wall thickness size, the parallelism with the central axis of the spiral section, the dimensional accuracy and shape position accuracy of the deformation section, and the surface quality. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic view of a spiral pipe space bending device;

[0016] Figure 2 FIG. 2 is a top view of the spiral pipe space bending device;

[0017] Figure 3 FIG. 3 is a space bending height schematic view;

[0018] Figure 4 is a schematic diagram of the angle of the spatial bend;

[0019] Figure 5 is a schematic diagram of the radius of the spatial bend;

[0020] Figure 6 is a schematic diagram of the spatial bend mold;

[0021] Figure 7 is a schematic diagram of the planar bend mold;

[0022] Figure 8 is a front view of the planar bend mold;

[0023] Figure 9 is a schematic diagram of a spiral pipe with a spatial bend;

[0024] Figure 10 is a schematic diagram of a first spiral pipe with a combined spatial bend;

[0025] Figure 11 is a schematic diagram of a second spiral pipe with a combined spatial bend. DETAILED DESCRIPTION

[0026] The present application will be further described in conjunction with the accompanying drawings.

[0027] The morphological characteristics of the spiral pipe spatial bend, the angle α of the spatial bend, the height h of the spatial bend, and the radius R' of the circle where the end of the spatial bend is located.

[0028] The spiral pipe with the completed spiral segment is fixed on the spatial bend mold 4, which is used in cooperation with the spherical mold 7 on the lifting device 3, while the over-bending angle of the rotating device 1 and the pressure value of the follow-up cylinder 25 of the follow-up pressing device 2 are controlled to bend the spatial bend. In addition, the planar bend mold 5 is added to cooperate with the spherical mold 7 to bend the planar bend, thereby forming a new spatial bend combination form.

[0029] The morphological characteristics of the spiral pipe spatial bend, the angle α of the spatial bend, the height h of the spatial bend, and the radius R' of the circle where the end of the spatial bend is located.

[0030] The space bending die 4 has an auxiliary bending groove 41, a forming bending groove 42 and a space over-bending groove 43; the space over-bending groove 43 matches the shape of the spiral pipe of the spiral section; the space over-bending groove 43 is used to realize the over-bending angle in the pipe bending process, which is affected by the material, performance and bending shape of the pipe and is different; the forming bending groove 42 is used to realize the main shape of the space bending, including the height h of the space bending, the circular radius R' of the space bending end point and the angle a of the space bending; the space over-bending groove 43 is used to realize the over-bending angle.

[0031] The follow-up cylinder 25 of the follow-up pressing device 2 needs to realize the floating function, and the pressure value cannot be too large or too small, and the influencing factors include the material, performance and bending shape of the pipe.

[0032] The spherical pressing die 7 on the lifting device 3 is used in cooperation with the forming die, and when the space bending die 4 is used, the lifting arm 32 follows the shape of the space forming groove to realize lifting in the sliding groove, and the spherical pressing die 7 follows the shape of the space forming groove to realize the angle transformation in the spherical bearing 33.

[0033] The plane bending die 5 has a plane fixed groove 51, a plane bending groove 52 and a plane over-bending groove 53; the plane fixed groove 51 is used to fix the pipe, and the plane over-bending groove 53 needs to consider the appropriate over-bending angle, and the plane bending formed by the cooperation of the plane bending die 5 and the spherical pressing die 7 is a plane bending, which is combined with the space bending to form a new space bending combined shape. Embodiment

[0034] As shown in Figure 9 , the product is a spiral pipe with a space bending, and the head and tail of the spiral pipe are provided with space bendings, and the middle part is a spiral section, the head space bending is outside the cylindrical surface of the spiral section, the tail space bending is inside the cylindrical surface of the spiral section, the head and tail straight section ports are in opposite directions and are parallel to the cylindrical surface of the spiral section.

[0035] As shown in Figure 2 , the head section of the spiral pipe after the spiral section bending is fixed on the space bending die 4, the space bending die 4 forms R'>R, at this time the swing arm 10 is in zero position, the counterweight cylinder 35 acts to balance the weight of the lifting arm 32, the follow-up cylinder 25 acts to push the lifting device 3 forward, the spherical pressing die 7 presses the pipe, the motor 12 starts to rotate to drive the swing arm 10 to start to rotate, the lifting arm 32 follows the shape of the space forming groove of the space bending die 4 to follow-up lifting, and at the same time the spherical pressing die 7 also follows the space forming groove to realize the angle transformation. After rotating to the appropriate over-bending angle, stop, the head space bending is completed. The tail space bending is basically the same as the head space bending, and the tail section of the spiral pipe after the spiral section bending is fixed on the space bending die 4, the space bending die 4 forms R'<R, and the rest of the operation is referred to the process of bending the head space bending. Embodiment

[0036] As shown in Figure 10 , the product is a spiral pipe with space bends, with the tail straight section located on the outside. The middle of the spiral pipe is a spiral section, the head is on the cylindrical surface of the spiral section, the tail is a combination of space bends and plane bends, the space bends are located on the cylindrical surface of the spiral section, a 90-degree plane bend is made after connecting the straight section, a second 90-degree plane bend is made after connecting the straight section, and finally the straight section is parallel to the cylindrical surface of the spiral section. The head and tail straight section ports are in the same direction.

[0037] As shown in Figure 2 , the head section of the spiral pipe with the spiral section bent is fixed on the space bend mold 4, which forms R'=R. At this time, the swing arm 10 is in the zero position, the counterweight cylinder 35 acts to balance the weight of the lifting arm 32, the follow-up cylinder 25 acts to push the lifting device 3 forward, the spherical mold 7 presses the pipe, the motor 12 starts to rotate, driving the swing arm 10 to start rotating, the lifting arm 32 follows the space forming groove of the space bend mold 4 to follow the lifting, and the spherical mold 7 also follows the space forming groove to change the angle. Finally, stop after rotating to the appropriate bending angle, the head space bend is completed. The same operation first completes the tail space bend, then replaces the U-shaped plane bend mold 5, translates a straight pipe, bends the first 90-degree bend (considering the bending angle), translates a straight pipe, bends the second 90-degree bend (considering the bending angle), and makes the final straight section parallel to the cylindrical surface of the spiral section. Embodiment

[0038] As shown in Figure 11 , the product is a spiral pipe with space bends, with the tail straight section located on the outside. The middle of the spiral pipe is a spiral section, the head is on the cylindrical surface of the spiral section, the tail is a combination of space bends and plane bends, the space bends are located on the cylindrical surface of the spiral section, a 90-degree plane bend is made after connecting the straight section, a second 90-degree plane bend is made after connecting the straight section, and finally the straight section is parallel to the cylindrical surface of the spiral section. The head and tail straight section ports are in the same direction.

[0039] As shown in Figure 2After the straight pipe is fixed on the U-shaped plane bending die 5 with the required length, the swing arm 10 is in the zero position, the counterweight cylinder 35 balances the weight of the lifting arm 32, the follow-up cylinder 25 drives the lifting device 3 to move forward, the spherical pressing die 7 presses the pipe, the motor 12 starts to rotate, the swing arm 10 starts to rotate, the U-shaped bend is bent (the bending angle is considered), then the space bending die 4 is replaced, the space bending die 4 forms R'=R, the pipe is fixed again, at this time the swing arm 10 is in the zero position, the counterweight cylinder 35 balances the weight of the lifting arm 32, the follow-up cylinder 25 drives the lifting device 3 to move forward, the spherical pressing die 7 presses the pipe, the motor 12 starts to rotate, the swing arm 10 starts to rotate, the lifting arm 32 follows the space forming groove of the space bending die 4 to move up and down, and the spherical pressing die 7 also follows the space forming groove to change the angle. Finally, the rotation stops after the appropriate over-bending angle is reached, and the head space bend is completed. The pipe with the completed head space bend is combined, and the middle spiral segment is coiled by using a special pipe coiling machine. Then the pipe with the coiled spiral segment is fixed on the space bending die 4 of the space bending forming device, the space bending die 4 forms R'=R, and the process of bending the head space bend is operated as described above. The straight segment is translated, the plane bending die 5 is replaced, the process of the plane U-shaped bend is operated as a reference, and finally the straight segment is parallel to the cylindrical surface of the spiral segment.

[0040] The method adopts a spiral pipe space bending device.

[0041] As shown in Figures 1 to 11 A spiral pipe space bending device includes a frame 11, a forming die and a rotating device 1 fixed on the frame 11, a follow-up pressing device 2 slidingly installed on a swing arm 10 of the rotating device 1, a lifting device 3 slidingly installed on the follow-up pressing device 2, and a spherical pressing die 7 rotatingly installed on the lifting device 3. The spherical pressing die 7 is oppositely arranged with the forming die. The spherical pressing die 7 is provided with an annular pressing groove 71, and the rotating device 1 is provided with the swing arm 10 for swinging left and right. The lifting device 3 is used for lifting in the vertical direction. The follow-up pressing device 2 is used for pressing the pipe material towards the forming die by the spherical pressing die 7, and the swing arm 10 is used for bending the pipe material.

[0042] The rotating device 1 is used for controlling the rotation angle. The lifting device 3 can float up and down according to the shape of the space bend. The follow-up pressing device 2 can float left and right according to the shape of the space bend. The space bending of the pipe material is realized by the cooperation of the die and the multiple shafts.

[0043] Specifically, the forming die is fixed on the top of the frame 11, the forming die includes a space bending die 4 provided with a space forming groove, the forming die is in a fan shape, the space forming groove includes a space bending space forming groove or a plane space forming groove, wherein the space complete space forming groove includes an auxiliary bending groove 41, a forming bending groove 42 and a bending passing groove arranged in sequence along the outer circumferential surface of the space bending die 4. The forming die further includes a plane bending die 5 provided with a plane forming groove. During forming, the forming die or the plane bending die 5 can be used alone, or the plane bending die 5 can be used first and then the forming die is used to bend the pipe. The plane forming groove includes a plane fixing groove 51, a plane bending groove 52 and a plane bending passing groove 53 arranged in sequence along the outer circumferential surface of the plane bending die 5. The plane fixing groove 51 is used for fixing the pipe, the plane bending groove 52 is used for plane bending forming, and the plane bending passing groove 53 is used for preventing springback. The plane bending formed by cooperation of the plane bending die 5 and the spherical pressing die 7 is combined with the space bending, so as to form a new space bending combined mode.

[0044] The rotating device 1 includes a rotating frame 17, a swing shaft 16, a swing frame 18, a speed reducer 13 and a motor 12. The rotating frame 17 is fixed on the frame 11, the swing shaft 16 is rotationally connected with the rotating frame 17 through a bearing, the swing frame 18 is a U-shaped frame, the swing frame 18 is fixed on the swing shaft 16 and movably inserted into the end of the rotating frame 17, and the swing arm 10 is fixed on the swing frame 18. The speed reducer 13 and the motor 12 are both fixed on the frame 11, and the motor 12 and the swing shaft 16 are respectively connected with the speed reducer 13. The speed reducer 13 is a worm gear speed reducer 13, has a self-locking function, prevents the position from changing during pipe bending, and ensures the quality of the bent pipe.

[0045] The following pressure device 2 includes a following seat 24 and a following cylinder 25. The following seat 24 is slidably installed on the swing arm 10 through a following linear guide pair, or the swing arm 10 is symmetrically provided with a following guide rail 22 on both sides, the following seat 24 is provided with a following roller 23 on both sides, and the following roller 23 is rollingly installed on the following guide rail 22. The following linear guide pair or the following guide rail 22 is horizontally arranged. The following cylinder 25 includes a driving cylinder, the driving cylinder is fixed on the end of the swing arm 10, the piston rod of the driving cylinder is connected with the following seat 24, and is used for pressing the following seat 24 to the forming die.

[0046] The lifting device 3 comprises a lifting seat 31, a lifting arm 32 and a counterweight cylinder 35, the lifting seat 31 is fixed on the follower seat 24, the lifting seat 31 is vertically arranged, the lifting seat 31 is provided with a lifting groove 311, the lifting arm 32 is slidably installed in the lifting groove 311 through a linear guide pair, or the lifting arm 32 is symmetrically provided with lifting rollers 37 on both sides, the lifting rollers 37 are rollingly installed in the lifting groove 311. The spherical die 7 is rotatably installed on the top of the lifting arm 32; the bottom of the lifting arm 32 is connected with the counterweight cylinder 35 through a connecting seat, the counterweight cylinder 35 is fixed on the lifting seat 31 and is arranged in parallel with the lifting arm 32, the counterweight cylinder 35 is used for balancing the weight of the lifting arm 32, so that the lifting arm 32 can freely lift and does not affect the bending of the pipe.

[0047] The top of the lifting arm 32 is provided with a spherical bearing 33, and the spherical die 7 is movably installed on the spherical bearing 33. The spherical bearing 33 enables the spherical die 7 to rotate at any angle.

[0048] The spatial bending pipe has the following morphological characteristics: the angle α of the spatial bending; the height h of the spatial bending; and the radius R' of the circle where the end point of the spatial bending is located.

[0049] The spiral pipe with the completed spiral segment bending is fixed on the spatial bending die 4, the spatial bending die 4 is used in cooperation with the spherical die 7 on the lifting device 3, the over-bending angle of the rotating device 1 and the pressure value of the follower cylinder 25 of the follower pressing device 2 are simultaneously controlled, and the spatial bending is bent. In addition, the planar bending die 5 is used in cooperation with the spherical die 7 to bend the planar bending, so as to form a new spatial bending combined form.

[0050] The spatial bending pipe has the following morphological characteristics: the angle α of the spatial bending, that is, the angle between the starting point of the spatial bending and the end point of the spatial bending; the height h of the spatial bending, that is, the height between the starting point of the spatial bending and the end point of the spatial bending; and the radius R' of the circle where the end point of the spatial bending is located. R is the spiral radius of the spiral segment, R'=R, the spatial bending is on the cylindrical surface of the spiral segment; R'>R, the spatial bending is outside the cylindrical surface of the spiral segment; and R'<R, the spatial bending is inside the cylindrical surface of the spiral segment.

[0051] The spatial bending die 4 has an auxiliary bending groove 41, a forming bending groove 42 and a spatial over-bending groove 43; the spatial over-bending groove 43 is matched with the form of the spiral pipe of the spiral segment; the spatial over-bending groove 43 is used to realize the over-bending angle in the pipe bending process, the over-bending angle is different due to the influence of the material quality, performance and bending form of the pipe material; the forming bending groove 42 is used to realize the main form of the spatial bending, including the height h of the spatial bending, the radius R' of the circle where the end point of the spatial bending is located, and the angle α of the spatial bending; and the spatial over-bending groove 43 is used to realize the over-bending angle.

[0052] The follower cylinder 25 of the follower pressing device 2 needs to realize the floating function, the pressure value thereof cannot be too large or too small, and the influencing factors include the material quality, performance and bending form of the pipe material.

[0053] The spherical die 7 on the lifting device 3 is used in cooperation with the forming die, the lifting arm 32 follows the shape of the space forming groove to realize lifting in the sliding groove when the space bending die 4 is used, and the spherical die 7 follows the shape of the space forming groove to realize the change of angle in the spherical bearing 33.

[0054] The plane bending die 5 has a plane fixed groove 51, a plane bending groove 52 and a plane over-bending groove 53; the plane fixed groove 51 is used for fixing the pipe, the plane over-bending groove 53 needs to consider the suitable over-bending angle, the plane bend formed by the cooperation of the plane bending die 5 and the spherical die 7, the plane bend and the space bend are combined, thereby forming the new space bend combination shape.

[0055] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present application, and cannot be explained as the limitation of the protection scope of the present application in any way. Based on the explanations here, the other specific embodiments of the present application can be thought of by the person skilled in the art without the creative labor, and these embodiments will fall into the protection scope of the claims of the present application.

Claims

1. A method of forming a helical tube space bend, characterized by, The method comprises the following steps: The end section of the spiral pipe after bending of the spiral section is fixed on the forming die, at this time the swing arm (10) is at zero position, the counterweight cylinder (35) balances the weight of the lifting arm (32); The follow-up cylinder (25) pushes the spherical pressing die (7) to press the end section of the spiral pipe on the forming die, then the swing arm (10) starts to rotate, the spherical pressing die (7) follows the space forming groove or the plane forming groove of the forming die to follow up and lift, at the same time the spherical pressing die (7) also follows the space forming groove or the plane forming groove to change the angle; After rotating to the appropriate bending angle, stop, the space bending or plane bending of the end section is completed; After the space bending of the space forming groove is completed, the plane forming groove is replaced, a straight pipe is first translated, the first 90-degree bend is bent, a straight pipe is translated again, the second 90-degree bend is bent, and the final straight section is parallel to the cylindrical surface of the spiral section.

2. A method of forming a helical tube space bend according to claim 1, wherein, After the plane bending of the plane forming groove is completed, the space forming groove is replaced, the pipe is fixed again, at this time the swing arm (10) is at zero position, the counterweight cylinder (35) balances the weight of the lifting arm (32); The follow-up cylinder (25) pushes the spherical pressing die (7) to press the pipe on the forming die, then the swing arm (10) starts to rotate, the spherical pressing die (7) follows the space bending die (4) to follow up and lift, at the same time the spherical pressing die (7) also follows the space bending die (4) to change the angle; After rotating to the appropriate bending angle, stop, the space bending of the pipe is completed.

3. A method of forming a spatial bend according to claim 1 or 2, characterised in that, The forming die comprises a space bending die (4) and a plane bending die (5); The plane forming groove is arranged on the plane bending die (5), and the plane forming groove comprises a plane fixing groove (51), a plane bending groove (52) and a plane bending-through groove (53) arranged in sequence along the outer circumferential surface of the plane bending die (5); The space forming groove is arranged on the space bending die (4), and the space forming groove comprises an auxiliary bending groove (41), a forming bending groove (42) and a space bending-through groove (43) arranged in sequence along the outer circumferential surface of the space bending die (4).

4. A method of forming a spatial bend according to claim 1 or 2, wherein The spherical pressing die (7) is provided with an annular pressing groove (71).

5. A method of forming a spatial bend according to claim 1 or 2, wherein The spherical pressing die (7) is connected with the follow-up pressing device (2) through the lifting device (3), the follow-up pressing device (2) is installed on the swing arm (10), and the swing arm (10) is installed on the rotating device (1).

6. A method of forming a helical duct space bend according to claim 5, wherein, The rotating device (1) comprises: A rotating frame (17); A swing shaft (16) which is rotatably installed on the rotating frame (17); A swing frame (18) which is fixed on the swing shaft (16) and connected with the swing arm (10); A speed reducer (13) which is connected with the swing shaft (16); and A motor (12) which is connected with the speed reducer (13).

7. A method of forming a helical duct space bend according to claim 5, wherein The follow-up pressing device (2) comprises: A follow-up seat (24) which is slidably installed on the swing arm (10); and A follow-up cylinder (25) which is installed on the swing arm (10) and connected with the follow-up seat (24).

8. A method of forming a helical duct space bend according to claim 5, wherein, The lifting device (3) comprises: A lifting seat (31) is slidingly installed on the follow-up pressing device (2); A lifting arm (32) is slidingly installed on the lifting seat (31), and the spherical pressing die (7) is rotatably installed on the top of the lifting arm (32); and A counterweight cylinder (35) is fixed on the lifting seat (31) and connected with the bottom of the lifting arm (32).

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