CN106064187B - A kind of wound form drawing heading pipe bender - Google Patents

Abstract

The invention discloses a winding type drawing and upsetting pipe bending machine, belonging to the field of pipe bending machines, which solves the problem that the existing top upsetting pipe bending machine interferes with pipe fittings and affects production and restricts production when the clamping mold is reset. The present invention includes a clamping device, a clamping mold and a main mold, the clamping device includes a clamping mold base, a slider, a slider base and a slider drive, the upper surface of the slider base is provided with a slide rail, the The slide block is arranged on the slide rail; the slide block drive is connected with the slide block; the clamp die seat is fixedly arranged on the slide block; the clamp die is passed through the pin It can be rotatably arranged on the clamping mold base near the end of the main mold; the side of the lower end of the main mold corresponding to the clamping mold is provided with a slope block. The invention can simplify the mechanism, avoid the influence of interference, have flexible actions, and reduce the processing difficulty of the pipe fittings.

Description

A winding type drawing top heading pipe bending machine

technical field

The invention belongs to the field of pipe bending machines, and in particular relates to a winding type drawing top heading pipe bending machine.

Background technique

Pipe fittings with bending angles are widely used in the field of pipeline transportation, especially for pipeline transportation technology that requires high precision. The uniformity of wall thickness of pipe fittings, uniformity of bending angles, roundness of inner and outer walls of bends, etc. determine the quality of pipe fittings. The bending of pipe fittings is realized by a pipe bender, which is a machine that bends pipe fittings. The pipe bending machine generally includes main mold, clamping mold, pressing rail mold, top heading mechanism, top heading clamping mold, anti-wrinkle mold and other components. For example, the Chinese patent application number 200710040527.7, the patent application document published on October 10, 2007, discloses a processing method and device for a small R bend, including a three-dimensional numerically controlled pipe bender with a hydraulic and servo motor drive mechanism , a forming pipe bending mold consisting of eight claw clamping dies, diameter dies, clamping dies, and formers, a flexible joint with a mandrel and accessories for the anti-wrinkle die. The diameter die, clamping die, former and anti-wrinkle dies It is equipped with a semi-circular long strip-shaped limit groove that matches the outer diameter of the workpiece, and it plays the roles of limit, auxiliary push, guide, cooperative clamping and synchronous bending and steering respectively during work. The active joint with mandrel has the function of The function of supporting the pipe wall and ensuring the quality of the bending, the anti-wrinkle mold has the function of preventing the inner side of the steel pipe from wrinkling, which is precisely controlled by the CNC servo, and is bent and formed in one clamping of the three-station mold. When the pipe bending machine is working, the main mold and the clamping mold are used to clamp the pipe fittings. The main mold rotates to realize the bending of the pipe fittings. When the main mold rotates, the clamping mold rotates synchronously. After the pipe fittings are bent in place, the clamping mold is separated from the main mold. Rotate and reset; Usually, when the pipe is bent in one direction and one bend, the clamping mold can be reset smoothly, but when the pipe needs to bend multiple bends in opposite directions (S-shaped pipe fitting), the clamping mold will interfere with the pipe , unable to achieve a smooth reset. Such as Chinese Patent Application No. 201410597788.9, a patent application document on March 25, 2015, which was published on March 25, 2015, describes a top heading pipe bender, and Chinese Patent Application No. 201120192806.7, published on April 25, 2012 An upsetting pipe bending machine includes a main mold body, a pushing guide plate, a pushing mechanism, and a mobile anti-wrinkle shaping device. Both the top pier pipe benders disclosed in the above two patent application documents will be interfered by such as S-shaped pipe bends when the clamping mold is reset, which limits the ability of the pipe bender to bend multiple bends in opposite directions. Processing of pipe fittings.

A known technical solution that can solve the above interference problem is to use a sinking clamping mold, that is, after the clamping mold is separated from the main mold, adjust the clamping mold to move downward relative to the main mold, bypass the elbow and then reset , this structure can solve the interference problem, but how to realize the sinking of the clamping mold, when it is separated from the main mold and when it rises, and when it is combined with the main mold, no friction will be generated on the pipe, and how to realize the structure of the sinking mechanism is simplified and the cost is the lowest. New technical problems that technicians need to face.

Contents of the invention

1. Problems to be solved

Aiming at the problem that the clamping mold of the existing top heading pipe bender interferes with the pipe fittings when it is reset, the present invention provides a winding type drawing top heading pipe bender, which adopts a climbing type clamping device, which can realize the independent reset of the main mold, thereby The above-mentioned problems are effectively solved, and at the same time, it has the effects of simple structure, flexible action, and can reduce the processing difficulty of pipe fittings.

2. Technical solution

In order to solve the above problems, the present invention adopts the following technical solutions.

A winding type drawing top heading pipe bender, including a clamping device, a clamping die and a main die, the clamping device includes a clamping die seat, a slide block, a slide block seat and a slide block drive, the slide block The upper surface of the seat is provided with a slide rail, and the slide block is arranged on the slide rail; the slide block drive is connected with the slide block; the clamping base is fixedly arranged on the slide block Above; the clamping mold is rotatably arranged on the clamping mold base at one end of the clamping mold base close to the main mold through a pin shaft; the lower end of the main mold is provided with a slope block on the side corresponding to the clamping mold.

Preferably, a limiting groove is provided above the side of the slope block at the lower end of the main mold; a bump is provided at the lower end of the clamping mold on the side opposite to the main mold, and the bump is corresponding to the limiting groove .

Preferably, one end of the clamping die connected to the clamping base is provided with a horizontal limit step and a vertical limit step; the end face of the clamping base includes an upper end face and a lower end face; the horizontal limit step and the The upper end face corresponds, and the vertical limit step corresponds to the lower end face.

Preferably, the upper surface of the ramp includes a horizontal section, a climbing section and an entry section from top to bottom; the horizontal section is parallel to the horizontal plane; the angle between the climbing section and the horizontal plane is greater than that between the entry section and the horizontal plane Angle.

Preferably, the bottom of the bump is an arc surface; the upper surface of the end of the entry section is set as an arc surface.

Preferably, the middle part of the slider seat is provided with a sliding hole along the direction of the slide rail, and a fixed hand is provided on the lower surface of the end away from the main mold seat; a sliding hand is provided at the bottom of the slider; the sliding hand is worn Through the sliding hole; the slider drive includes an oil cylinder, a fixed connecting rod and a moving connecting rod; one end of the fixed connecting rod is connected with the piston rod of the oil cylinder through a pin, and the other end is connected with the fixed hand through a pin; the One end of the moving connecting rod is connected with the piston rod of the oil cylinder through a pin shaft, and the other end is connected with the sliding hand through a pin shaft.

Preferably, the upper surface of the slider is provided with a track, and the clamping base is arranged on the track and fixed by a set bolt; the upper surface of the slider is provided with a T-shaped groove, and the T The mold groove is provided with a mold clamp positioning seat, which is fixed by a set bolt; the clamp mold base is provided with a mold clamp fine-adjustment rod, and one end of the clamp mold fine-adjustment rod is threadedly connected with the end face of the clamp mold base, and the other end is Contact with the clamp mold positioning seat.

Preferably, the clamping fine adjustment rod is provided with a clamping fine adjustment nut.

Preferably, it also includes a main mold reset device; the main mold reset device includes a main mold bracket, a bracket gear and a main mold seat gear; the main mold seat is provided with a main mold at a position corresponding to the ramp linkage groove; the main mold base is rotatably arranged on the main mold support; the main mold support is fixedly connected with the slider seat; One end is provided with a linkage protrusion.

Preferably, the main mold bracket is a hollow structure; the upper end of the main mold base is connected to the upper end face bearing of the main mold bracket, and the lower end passes through the main mold bracket and is fixedly connected with the gear of the main mold base; The main mold base gear and the main mold support are connected through bearings; the outer wall of the main mold support is provided with a support gear.

3. Beneficial effects

Compared with the prior art, the beneficial effects of the present invention are:

(1) The present invention is equipped with a clamping device, the maximum height of the clamping mold base is lower than the main mold, and at the same time, the clamping mold is set to cooperate with the slope block, which can effectively prevent interference when the pipe fittings are disassembled, and the present invention can be applied to Processing multi-bending direction pipe fittings improves production efficiency and application range;

(2) The clamping pipe fittings of the present invention have high positioning accuracy and stable clamping, and the above-mentioned beneficial effects are ensured by using the double-limiting device of the bump and the limiting groove, the horizontal limiting step and the upper end surface;

(3) The design of the slope block in the present invention can make the clamping action of the pipe fittings from fast to slow, and finally realize the horizontal clamping of the pipe fittings, with high work efficiency, and the horizontal clamping can prevent frictional deformation and frictional scratches of the pipe fittings;

(4) The present invention has flexible action, compact structure, stable transmission, strong power output, and high action controllability, thereby improving the bending precision;

(5) The present invention can be adapted to process pipe fittings with different diameters and specifications by adjusting the clamping stroke, and has a wide processing range, which reduces the processing cost of multi-standard pipe fittings and improves efficiency;

(6) The present invention adds a main mold resetting device to cooperate with the clamping device. After the pipe fitting is bent, the clamping device releases the pipe fitting. If the main mold and the clamping device are reset synchronously, the pipe fitting needs to be unloaded at this time. Utilizing the main mold reset device of the present invention, the clamping device can be reset in advance. At this time, the pipe fittings do not need to be unloaded, and can be directly adjusted to the next bending station, and then the main mold is reset independently. After the main mold is reset, the clamping device Then clamp the pipe fittings, which greatly improves the work efficiency.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the three-dimensional structural view of clamping device in the present invention;

Fig. 3 is the front view of clamping device among the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a sectional schematic diagram along line A-A in Fig. 4;

Fig. 6 is the enlarged schematic diagram of parts such as master mold, clamping mold, clamping mold base among the present invention;

Fig. 7 is the front view of Fig. 5;

Fig. 8 is the state diagram after main mold and clamping mold are combined in Fig. 7;

FIG. 9 is a schematic perspective view of another angle of FIG. 6;

Figure 10 is an overall state diagram when the main mold and the clamping mold are separated in the present invention;

Figure 11 is a sectional view of Figure 10;

Fig. 12 is a state diagram of clamping die rising process in Fig. 11;

Fig. 13 is a connection structure diagram of the main mold reset device and the clamping device of the present invention;

Fig. 14 is a cross-sectional view of the master mold reset device of the present invention.

Among the figure: 1, clamping device; 11, clamping mold seat; 111, clamping mold fixing groove; 112, clamping mold fine-tuning rod; 113, upper end face; 114, lower end face; 115, clamping die fine-tuning nut; Bolt; 12, clamping mold positioning seat; 121, set bolt; 13, slide block; 131, linkage protrusion; 132, slide hand; 14, slide block seat; 141, slide hole; 142, fixed hand; 15, slide block drive; 151, oil cylinder; 152, fixed connecting rod; 153, moving connecting rod; 16, pipe clamp;

2. Main mold reset device; 21. Main mold base; 211. Main mold linkage groove; 22. Main mold bracket; 23. Bracket gear; 24. Main mold base gear;

3. Clamping die; 31. Clamping die mouth; 32. Protrusion; 33. Horizontal limit step; 34. Vertical limit step;

4. Main formwork; 41. Main formwork opening; 42. Limiting groove; 43. Slope block; 431. Horizontal section; 432. Climbing section; 433. Entering slope section;

5. Binder rail mold; 6. Upsetting mechanism.

detailed description

The present invention will be further described below in conjunction with specific embodiments.

Example 1

As shown in Figure 1, a winding-type drawing top heading pipe bender includes a clamping device 1, a main mold reset device 2, a clamping mold 3, a main mold 4, a pressing rail mold 5, and a top heading mechanism 6, such as As shown in Figure 13, the main mold reset device 2 includes a main mold base 21, a main mold bracket 22 and a main mold base gear 24; as shown in Figures 2, 3 and 4, the clamping device 1 includes a clamping mold base 11, a Block 13, slider seat 14 and slider drive 15;

The main mold holder 21 is rotatably arranged on the main mold support 22, specifically as shown in Figure 14, the main mold support 22 is a hollow structure, the upper end of the main mold 21 is connected with the upper end surface bearing of the main mold support 22, and the lower end passes through Master mold support 22 is fixedly connected with master mold holder gear 24; Master mold holder gear 24 is connected with master mold holder 22 by bearing, and master mold holder 21 can rotate relative to master mold holder 22 under the drive of master mold holder gear 24;

The outer wall of the main mold support 22 is provided with a support gear 23;

As shown in Figure 8, the main mold 4 is fixedly arranged on the main mold base 21; the upper surface of the clamping mold base 11 is lower than the lowest point of the main mold mouth 41 on the main mold 4, so that the installation and disassembly of the pipe fittings will not be affected by the clamping mold base. 11 interference;

As shown in Figure 13, the main mold support 22 is fixedly connected with the slider base 14; the main mold base (21) is provided with a main mold linkage groove (211); One end of is provided with a linkage protrusion 131, and the linkage protrusion 131 corresponds to the linkage groove 211 of the main mold;

As shown in Figure 5, the upper surface of the slider seat 14 is provided with a slide rail, and the slide block 13 is arranged on the slide rail; the clamping mold base 11 is fixedly arranged on the slider 13; There is a clamping mold fixing groove 111, and the clamping mold 3 is rotatably arranged in the clamping mold fixing groove 111 through a pin shaft;

As shown in Figure 5, slide block 14 middle part is provided with slide hole 141 along its slide rail direction, is provided with fixed hand 142 on the lower surface of one end away from main mold base 21; Slide block 13 bottom is provided with slide hand 132; Slide hand 132 Pass slide hole 141; Slider drive 15 comprises oil cylinder 151, fixed connecting rod 152 and moving connecting rod 153; The end of the cylinder body of oil cylinder 151 is arranged on the side plate that is fixedly connected with slide block seat 14 by pin shaft, and oil cylinder 151 It can rotate relative to the side plate fixedly connected with the slider seat 14; one end of the fixed connecting rod 152 is connected with the piston rod of the oil cylinder 151 through a pin, and the other end is connected with the fixed hand 142 through a pin; one end of the moving connecting rod 153 is connected with the cylinder 151 The piston rod is connected by a pin shaft, and the other end is connected with the sliding hand 132 by a pin shaft; this driving structure can reduce the installation space, increase the output power, and make the action of the slider 13 safer and more reliable;

As shown in Figures 6 and 7, the upper end of the main mold 4 is provided with a main mold opening 41, the lower end is provided with a limiting groove 42, and the side of the lower end is provided with a slope block 43; one end of the clamping mold 3 is rotatably connected to the clamping mold fixing groove through a pin shaft 111, the other end is provided with clamping die opening 31 and projection 32; As shown in Figure 8, clamping die opening 31 is matched with main die opening 41 to form pipe fitting clamping mouth 16 correspondingly; Protrusion block 32 is corresponding to limit groove 42 The setting of the slope block 43 of the present invention can make the clamping die 3 gradually rise in the process of clamping the pipe fittings and gradually descend in the process of loosening the pipe fittings, thereby effectively bypassing the processed pipe fittings, solving the interference problem, and simultaneously solving the problem of multiple processing. The problem of interference between pipe fittings and clamping dies when bending direction pipe fittings;

One end of the clamping mold 3 connected to the clamping mold base 11 is provided with a horizontal limit step 33 and a vertical limit step 34; the end face of one end of the clamping mold base 11 provided with the clamping mold fixing groove 111 includes an upper end face 113 and a lower end face 114; as shown in the figure 6, the horizontal limit step 33 corresponds to the upper end surface 113. As shown in FIG. Die 3 rises further to cause deformation of the clamped pipe fittings. Although the protrusion 32 and the limit groove 22 can effectively prevent the clamping die 3 from rising further, it is safer and more reliable under the condition of double insurance; as shown in Figure 8, the vertical The limiting step 34 corresponds to the lower end surface 114, as shown in Figure 7, when the clamping mold 3 descends to the position shown in Figure 6, the weight of the clamping mold 3 itself will make it have a tendency to continue to decline, at this time the vertical limiting step 34 and the lower end surface 114 can effectively prevent the clamping mold 3 from continuing to descend, thereby ensuring that the bump 32 can climb up the slope block 23 smoothly when the clamping mold 3 rises next time;

As shown in Figure 7, the bottom of the bump 32 is a circular arc surface; the upper surface of the slope block 43 includes a horizontal section 431, a climbing section 432 and a slope section 433 from top to bottom; the horizontal section 431 is parallel to the horizontal plane; the climbing section 432 is parallel to the horizontal plane; The angle of the horizontal plane is greater than the angle between the slope section 433 and the horizontal plane. The effect of such setting is that the lower surface of the bump 32 is set as a circular arc surface, and the end of the slope section 433 on the slope block 43 is set as a circle corresponding to the lower surface of the bump 32. arc surface, so as to ensure that the bump 32 can climb up the slope block 43 smoothly when the clamping mold 3 rises again, and the angle between the climbing section 432 and the horizontal plane is greater than the angle between the entering slope section 433 and the horizontal plane, which can make the clamping mold 3 rise faster in the early stage. Improve work efficiency, reduce speed in the later stage, provide stability and reduce impact; the setting of horizontal section 431 enables the upper clamping die opening 31 of the clamping die 3 to be combined with the main die opening 41 in the horizontal direction, which solves the problem of traditional clamping dies in clamping pipe fittings. The problem of scratching or deforming the surface of the pipe fitting due to torsion in an instant.

A method of using a winding-type drawing and upsetting pipe bender: first, make the device in the state shown in Figure 10, at this time, the highest points of the clamping die 3 and the clamping die base 11 are lower than the lowest point of the main die mouth 41 , it is convenient to install the pipe fittings into the main die opening 41. After the pipe fittings are installed in the main die opening 41, the outer wall of the pipe fittings is attached to the inner wall of the main die opening 41, and the pressing rail mold 5 and the top heading mechanism 6 are adopted as shown in Fig. 1 Clamp the positioning pipe fittings; then start the oil cylinder 151, as shown in Figure 11 and Figure 12, the piston rod of the oil cylinder 151 is elongated, and the moving connecting rod 153 and the fixed connecting rod 152 are pushed to gradually become horizontal, and the moving connecting rod 153 passes through the sliding hand 132 Push the slider 13 to slide towards the main mold base 21 on the slider base 14; the clamping mold 3 crawls upwards along the slope block 43 through its protrusion 32, passes through the slope section 433, the climbing section 432 and the horizontal section 431 successively, and finally The block 32 enters the limiting groove 42 horizontally, and the clamping die opening 31 clamps the pipe fitting installed in the main die opening 41 along the horizontal direction; Clamp the pipe fitting in the horizontal direction, but if the clamping force is too large, there is a risk of damage to the protrusion 32 or the limit groove 42. At this time, the horizontal limit step 33 and the upper end surface 113 fit together, which can further ensure the clamping die 3 to rise After reaching the horizontal position, it will not rise again, so that the clamping of the pipe fittings is reliable; after the pipe fittings are clamped and fixed, the main mold base gear 24 and the bracket gear 23 are synchronously driven to rotate at the same angular speed, thereby respectively driving the clamping device and the main mold to reset The device rotates synchronously. At the same time, the upsetting mechanism 6 gives the pipe fittings a force to push in the direction of the main mold 4, and the pipe fittings are bent. After the pipe fittings are bent to the required angle, start the oil cylinder 151 again. The action of the slider drive 15 is reversed to realize the separation of the clamping mold 3 from the main mold 4, and at the same time the linkage protrusion 131 is also separated from the linkage groove 211 of the main mold. position, and then drive the main mold holder gear 24 to realize the independent reset of the main mold 4.

In this embodiment, the main mold reset device is set to realize the independent reset function of the main mold 4. The advantage of this function is that even if the clamping device of the present invention or the sinking clamping mold in the prior art is not used, the replacement of the pipe fittings is easy. It will not be interfered by the clamping base, so in this embodiment, even if the clamping device is damaged, the manufacturer can still solve the problem of interference between the pipe fitting and the clamping base without replacing the original clamping device, thereby improving the multi-functionality of the present invention. Functionality and multi-adaptability save costs for production.

Example 2

A winding type drawing and upsetting pipe bending machine, which is basically the same as that of Embodiment 1, except that a track is provided on the upper surface of the slider 13 close to the main mold 4, and a T-shaped groove is provided on the other side; As shown in Fig. 5 or Fig. 11, the mold clamping seat 11 is arranged on the track and fixed by a tightening bolt 116, and the T-shaped slot is provided with a clamping mold positioning seat 12, which is fixed by a tightening bolt 121; as shown in Fig. 5 One end of the clamping base 11 close to the main mold 4 is provided with a clamping mold fixing groove 111, the clamping mold 3 is rotatably arranged in the clamping mold fixing groove 111 through a pin shaft, and the other end of the clamping mold base 11 is provided with a clamping mold fine-tuning lever 112 One end of the clamping fine-tuning rod 112 is threadedly connected with the end face of the clamping base 11, and the other end is in contact with the clamping positioning seat 12, and the clamping fine-tuning rod 112 is provided with a clamping fine-tuning nut 115.

Compared with Example 1, the stroke adjustment function of the clamping die 3 is added in this embodiment. When the diameter of the pipe to be processed changes, it is necessary to adapt the diameter of the pipe by replacing the clamping die 3 and the main die 4. The diameter of the pipe becomes larger, and the clamping die 3 The position of the clamping mold is adjusted backward relative to the main mold 4, as shown in Figure 5, first loosen the set bolt 116, loosen the clamping mold fine-tuning nut 115, and manually rotate the clamping mold fine-tuning lever 112, because the clamping mold fine-adjusting lever 112 and the clamping mold seat The end faces of 11 are threaded, so when rotating the mold clamping fine-tuning lever 112, the clamping mold base 11 will move along the track, thereby adjusting the clamping mold base 11 to an appropriate position, and then tighten the clamping mold fine-adjusting nut 115 and the set bolt 116; when the above adjustment If it still cannot meet the requirements, loosen the set bolt 121 and adjust the position of the clamping mold positioning seat 12 on the T-shaped slot, thereby further increasing or reducing the position adjustment range of the clamping mold base 11 to meet the stroke of the clamping mold 3 Regulatory requirements.

Claims (7)

1. a kind of wound form drawing heading pipe bender, including clamping device (1), clamping (3) and main mould (4), it is characterised in that： Described clamping device (1) includes clamping seat (11), sliding block (13), take-up housing (14) and slider-actuated (15), described sliding block Seat (14) upper surface is provided with slide rail, and described sliding block (13) is arranged on described slide rail；Described slider-actuated (15) with Described sliding block (13) connection；Described clamping seat (11) is fixedly installed on described sliding block (13)；Described clamping (3) is led to Bearing pin is crossed to be rotatably disposed in clamping seat (11) near one end of main mould (4)；Described main mould (4) lower end is right with clamping (3) The side answered is provided with slope block (43)；Also include main mould resetting means (2)；Described main mould resetting means (2) includes main mould branch Frame (22), support gear (23) and main mould seat gear (24)；It is corresponding with described slope block (43) in described main mould seat (21) Position is provided with main mould linkage groove (211)；Described main mould seat (21) is rotatably disposed on main mould support (22)；Described master Mould holder (22) is fixedly connected with described take-up housing (14)；Towards main mould linkage in main mould seat (21) on described sliding block (13) It is raised (131) that one end of groove (211) is provided with linkage；Described main mould support (22) is hollow structure；Described main mould seat (21) upper end is connected with described main mould support (22) upper end spherical bearing, and lower end passes through main mould support (22) and described main mould seat Gear (24) is fixedly connected；Described main mould seat gear (24) is connected with main mould support (22) by bearing；Described main mould branch Frame (22) outer wall is provided with support gear (23)；The top that described main mould (4) lower end sets slope block (43) side sets limited Position groove (42)；The lower end of described clamping (3) one side relative with main mould (4) is provided with projection (32), described projection (32) It is corresponding with stopper slot (42).

2. a kind of wound form drawing heading pipe bender according to claim 1, it is characterised in that：Described clamping (3) with One end of clamping seat (11) connection is provided with Horizontal limiting step (33) and vertical limited step (34)；Described clamping seat (11) End face include upper surface (113) and lower surface (114)；Described Horizontal limiting step (33) is corresponding with upper surface (113), institute The vertical limited step (34) stated is corresponding with lower surface (114).

3. a kind of wound form drawing heading pipe bender according to claim 1, it is characterised in that：On described slope block (43) Surface includes horizontal segment (431), section of climbing (432) and enters slope section (433) successively from top to bottom；Described horizontal segment (431) with Plane-parallel；Described section of climbing (432) is more than the angle into slope section (433) with horizontal plane with the angle of horizontal plane.

4. a kind of wound form drawing heading pipe bender according to claim 3, it is characterised in that：Described projection (32) bottom Portion is arc surface；Described slope section (433) the end upper surface that enters is set to arc surface.

5. a kind of wound form drawing heading pipe bender according to claim 1-4 any one, it is characterised in that：Described Take-up housing (14) middle part is provided with sliding eye (141) along its slide rail direction, and one end lower surface away from main mould seat (21) is provided with Fixed hand (142)；Described sliding block (13) bottom is provided with slip hand (132)；Described slip hand (132) is through sliding eye (141)；Described slider-actuated (15) including oil cylinder (151), determine connecting rod (152) and dynamic connecting rod (153)；Described determines connecting rod (152) one end is connected with the piston rod of oil cylinder (151) by bearing pin, and the other end is connected with fixed hand (142) by bearing pin；It is described Dynamic connecting rod (153) one end be connected by bearing pin with the piston rod of oil cylinder (151), the other end with slide hand (132) by bearing pin Connection.

6. a kind of wound form drawing heading pipe bender according to claim 1-4 any one, it is characterised in that：Described Sliding block (13) upper surface sets track, and described clamping seat (11) is arranged on described track, and by tight fixed bolt (116) It is fixed；Described sliding block (13) upper surface sets T-slot, and clamping positioning seat (12) is provided with described T-slot, and by tight Determine bolt (121) fixed；Be provided with clamping regulating rod (112) on described clamping seat (11), clamping regulating rod (112) one end with The end-face helical connection of described clamping seat (11), the other end is contacted with described clamping positioning seat (12).

7. a kind of wound form drawing heading pipe bender according to claim 6, it is characterised in that：Described clamping regulating rod (112) clamping fine-tuning nut (115) is provided with.