Hydraulic elbow pipe expanding and shrinking all-in-one machine

Abstract

The utility model relates to a hydraulic elbow pipe expanding and shrinking all-in-one machine, and belongs to machining equipment. According to the technical scheme, the pipe bending machine comprises a rack, a pipe bending die and a pipe expanding and shrinking die, the pipe bending die is arranged above one side of the rack, and the pipe expanding and shrinking die is arranged at the end of one side of the rack; the pipe bending die comprises a positioning semicircular die and two rotating dies, the semicircular die is provided with an arc-shaped die cavity, the lower part of the semicircular die is arranged on a slide way, the slide way is fixed on the rack, the rear end of the semicircular die is provided with a pipe bending positioning hydraulic cylinder, the rotating dies are provided with arc-shaped die cavities, the lower ends of the rotating dies are hinged to the rack, and the arc-shaped die cavities of the two semicircular dies can rotate between a concentric state and a certain angle; the outer side of the rotating die is connected with the front end of a piston rod of a pipe bending hydraulic cylinder, and a cylinder body of the pipe bending hydraulic cylinder is connected to the rack in a hinged mode. Round pipes of various specifications can be bent, pipe openings of the round pipes with different diameters can be enlarged or reduced, and multiple purposes of one machine are achieved.

Description

Technical Field

[0001] The utility model relates to a hydraulic pipe bending, expanding and shrinking integrated machine, belonging to machining equipment. Background Art

[0002] At present, the pipe bending machine expansion and contraction equipment is a split equipment. For some manufacturers, small batches of pipe bending, expansion or contraction

[0003] Purchasing large-scale automated equipment has high production efficiency, but it is expensive and not suitable for small factories.

[0004] There is a big difference in the functions of bending pipes and expanding and contracting pipes. They can only be used simultaneously in hydraulic control, and their structures are not very similar.

[0005] Therefore, it is particularly important to design the installation position of the pipe bend and expander to reduce the size of the equipment. Summary of the invention

[0006] The present invention provides a hydraulic pipe bending and expanding and shrinking integrated machine, which realizes the setting of pipe bending and pipe expanding and shrinking in one machine, and reduces the volume of equipment and the complexity of installation and arrangement.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A hydraulic pipe bending and expanding and contracting integrated machine, characterized in that it comprises a frame, a pipe bending die and a pipe expanding and contracting die, wherein the pipe bending die is arranged above one side of the frame, and the pipe expanding and contracting die is arranged at one end of the frame;

[0009] The pipe bending die comprises a positioning semicircular die and two rotating dies, the semicircular die is provided with an arc-shaped die groove, the lower part of the semicircular die is arranged on a slideway, the slideway is fixed on a frame, a pipe bending positioning hydraulic cylinder is arranged at the rear end of the semicircular die, the rotating die is provided with an arc-shaped die groove, the lower end of which is hingedly connected to the frame, the arc-shaped die grooves of the two semicircular dies can rotate between concentricity and a certain angle, the angle is less than 180 degrees and greater than the angle between the extension lines of the arc-shaped die grooves on both sides of the semicircular die, the outer side of the rotating die is connected to the front end of the piston rod of the pipe bending hydraulic cylinder, the cylinder body of the pipe bending hydraulic cylinder is hingedly connected to the frame, and the pipe to be bent is placed in the arc-shaped die groove between the semicircular die and the two rotating dies;

[0010] The expansion and contraction pipe mold includes a fixed component, an expansion and contraction mold and an expansion and contraction hydraulic cylinder. The expansion and contraction hydraulic cylinder is fixed on a frame, the fixed component is arranged at the piston rod end of the expansion and contraction hydraulic cylinder, the expansion and contraction mold is arranged at the piston rod end of the expansion and contraction hydraulic cylinder, the pipe to be expanded and contracted is fixed by the fixed component, and the expansion and contraction mold is located at the end of the pipe to be expanded and contracted.

[0011] According to the hydraulic pipe bending and expanding and shrinking integrated machine, the fixing assembly includes an expansion and shrinking fixing frame, an upper callan, a lower callan, a clamping sleeve, and a cam clamping mechanism. The upper callan and the lower callan are respectively provided with semicircular holes, and the semicircular holes of the upper callan and the lower callan are respectively installed with semicircular clamping sleeves. The two semicircular clamping sleeves are relative to each other to form a circle and the clamping sleeves are installed. The upper callan and the lower callan are on one side of the expansion and shrinking fixing frame, and the expansion and shrinking hydraulic cylinder is installed on the other side of the expansion and shrinking fixing frame. The cam clamping mechanism is arranged on the inner side of the upper callan and the lower callan, and the expansion and shrinking mold is installed between the piston rod of the expansion and shrinking hydraulic cylinder and the cam clamping mechanism.

[0012] According to the hydraulic pipe bending and expanding and shrinking integrated machine, the cam clamping mechanism includes an L-shaped lower pressure plate, a U-shaped ring and a lower pressure handle. One end of the L-shaped lower pressure plate is vertically arranged at the bottom and hingedly connected to the expansion and shrinkage fixing frame, and the other end is horizontally located above the upper calliper. A groove is provided at the end of the horizontal line portion of the L-shaped lower pressure plate. Both sides of the open mouth of the U-shaped ring are hingedly connected to the middle part of the lower pressure handle, and the inner side end of the lower pressure handle is hingedly connected to the expansion and shrinkage fixing frame. The lower pressure handle is pressed downward to drive the U-shaped ring downward, and when the U-shaped ring is embedded in the groove of the horizontal line portion of the L-shaped lower pressure plate, the upper calliper and the lower calliper are clamped to the pipe fitting to be processed.

[0013] According to the hydraulic pipe bending and expanding and contracting integrated machine, the expanding and contracting pipe die also includes a second fixing component, a threaded seat, a trapezoidal nut, an eight-petal lock, a pull rod, an expansion head and a connecting shaft;

[0014] The expansion and contraction hydraulic cylinder is a bidirectional hydraulic cylinder, the end of the second piston rod is connected to the pull rod in a threaded manner, the other end of the pull rod is connected to the expansion head and the end shaft, the short tube to be expanded is sleeved on the pull rod, the threaded seat is fixed on the cylinder body of the bidirectional hydraulic cylinder, the piston rod passes through the threaded seat, and a reminder nut and an eight-petal lock are provided in the threaded seat. The inner end of the short tube to be expanded is sleeved on the eight-petal lock for positioning, and the other end is embedded in the expansion head. The expansion head is stretched by the pull rod and embedded in the short tube to be expanded to expand the end of the short tube to be expanded.

[0015] According to the hydraulic pipe bending and expanding and contracting integrated machine, it also includes a pipe expansion control valve, which is arranged on the outer side of the expansion and contraction fixed frame. The pipe expansion fixed valve controls the two-way hydraulic cylinder. The expansion and contraction fixed frame is provided with an expansion and contraction guard plate with an upward flip structure at the expansion and contraction mold. The expansion and contraction guard plate is hinged to the expansion and contraction fixed frame and covers the top and both sides of the expansion and contraction mold.

[0016] According to the hydraulic pipe bending and expanding and shrinking machine, the rotating mold is arranged on a support, and a stretching ear plate is extended outward from the lower part of the support, and the stretching ear plate is hingedly connected to the front end of the piston rod of the pipe bending hydraulic cylinder. A pair of rotating ear plates is arranged in the middle part of the support, and the frame is provided with a fixed hole seat. The rotating ear plate and the fixed empty seat are also provided with pin shaft holes. The fixed hole seat is arranged between the two rotating ear plates, and the pin shaft holes are coaxial and the pin shaft is inserted.

[0017] According to the hydraulic pipe bending and expanding and contracting integrated machine, the rotating mold is a rectangular strip, one side of which is provided with the arc-shaped mold groove, and the other side is fixed to the support. The two rotating molds, the support and the fixed hole seat are arranged symmetrically relative to the center of the pipe bending positioning hydraulic cylinder.

[0018] According to the hydraulic pipe bending and expanding and shrinking integrated machine, the frame is in the shape of a portal, with a prime number of expanding and shrinking pipe molds on one side, and the pipe bending molds on the other side and the top. Universal wheels are provided at the bottom of the frame, and a hydraulic station and an electric control box are provided at the bottom, and a control valve is provided on the side.

[0019] The main functions of this product are: first, it can bend and fold round tubes of various specifications to meet the bending requirements of customers. The bending ability is outstanding, which solves the problem of deformation and shrinkage of many thin-walled tubes when bending. Secondly, the expansion and contraction tube mold part can enlarge or reduce the diameter of the tube mouth according to different round tube diameters, realizing multiple uses of one machine and reducing equipment procurement costs.

[0020] Rationally layout the product structure and simplify the overall equipment volume as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a three-dimensional Figure 1 ,

[0022] Figure 2 The utility model is a three-dimensional Figure 2 ,

[0023] Figure 3 This is an exploded view of the components of the utility model.

[0024] Figure 4 It is a side view of the utility model.

[0025] Figure 5 It is a top view of the utility model.

[0026] Figure numerals: 1 frame, 2 expansion and contraction tube mold, 201 expansion and contraction fixing frame, 202 expansion and contraction hydraulic cylinder, 203 pull rod, 204 expansion head, 205 end shaft, 206 eight-petal lock, 20407 threaded seat, 208 trapezoidal nut, 209 expansion tube control valve, 210 expansion and contraction guard plate, 211 L-type lower pressure plate, 212 fastening groove, 213 upper calliper, 214 lower calliper, 215 shrinking mold, 216 expansion mold, 21407 clamping sleeve, 218 pin, 219 U-shaped ring, 220 pressing handle, 3 oil tank, 4 bending tube mold, 401 semicircular mold, 402 arc mold groove, 403 rotating mold, 404 right support, 405 left support, 406 positioning hydraulic cylinder, 407 Rotating ear plate, 408 stretching ear plate, 409 pin shaft hole, 410 slideway 411 bending hydraulic cylinder 412 dial 413 pointer 414 bending hydraulic control valve 415 bending guard plate, 5 universal wheel, 6 electric control box 407 pipe fittings. DETAILED DESCRIPTION

[0027] The specific structure of the utility model is further described below:

[0028] The utility model discloses a hydraulic pipe bending and expanding and shrinking integrated machine, comprising a machine frame 1, a pipe bending die 4 and a pipe expanding and shrinking die 2.

[0029] The frame 1 is in the shape of a gantry, with an expansion and contraction tube mold 2 on one side, and the tube bending mold 4 on the other side and the top. The bottom of the frame 1 is provided with universal wheels, a hydraulic station and an electric control box are provided at the bottom, and a control valve is provided on the side.

[0030] The pipe bending die 4 is used for bending hollow pipes. It works through the main oil cylinder and the side cylinders on both sides to drive the die to rotate and then bend the pipe. The expansion and contraction pipe die 2 is used for shrinking or expanding the end head of a short or long pipe.

[0031] Specifically, the tube bending die 4 of the device is arranged above one side of the frame 1 , and the tube expansion and contraction die 2 is arranged at one end of the frame 1 .

[0032] The pipe bending die 4 comprises a positioning semicircular die 401 and two rotating dies 403. The semicircular die 401 is provided with an arc-shaped die groove 402. The lower part of the semicircular die 401 is arranged on a slideway fixed on the frame 1. The rear end of the semicircular die 401 is provided with a pipe bending positioning hydraulic cylinder 406.

[0033] The rotating die 403 is provided with an arc-shaped die groove 402, and the lower end is hingedly connected to the frame 1. The arc-shaped die grooves 402 of the two semicircular dies 401 can rotate between concentricity and a certain angle, and the angle is less than 180 degrees and greater than the angle between the extension lines on both sides of the arc-shaped die groove 402 on the semicircular die 401. The outer side of the rotating die 403 is connected to the front end of the piston rod of the bending hydraulic cylinder, and the cylinder body of the bending hydraulic cylinder is hingedly connected to the frame 1. The pipe to be bent is placed in the arc-shaped die groove 402 between the semicircular die 401 and the two rotating dies 403.

[0034] The rotating die 403 is arranged on a support, and a stretching ear plate 408 is extended outward from the lower part of the support, and the stretching ear plate 408 is hingedly connected to the front end of the piston rod of the bending hydraulic cylinder. A pair of rotating ear plates 4407 is arranged in the middle part of the support, and the frame 1 is provided with a fixed hole seat. The rotating ear plate 4407 and the fixed empty seat are also provided with a pin shaft hole. The fixed hole seat is arranged between the two rotating ear plates 4407, and the pin shaft hole is coaxial and the pin 218 is inserted.

[0035] The rotating die 403 is a rectangular strip, one side of which is provided with the arc-shaped die groove 402 and the other side is fixed to the support. The two rotating dies 403 and the support and the fixed hole seat are symmetrically arranged relative to the center of the bending pipe positioning hydraulic cylinder 406.

[0036] The expansion and contraction pipe mold 2 includes a fixed component, an expansion and contraction mold and an expansion and contraction hydraulic cylinder 202. The expansion and contraction hydraulic cylinder 202 is fixed on the frame 1. The fixed component is set at the piston rod end of the expansion and contraction hydraulic cylinder 202. The expansion and contraction mold is set at the piston rod end of the expansion and contraction hydraulic cylinder 202. The pipe to be expanded and contracted is fixed by the fixed component, and the expansion and contraction mold is at the end of the pipe to be expanded and contracted.

[0037] The fixing assembly includes an expansion and contraction fixing frame 201, an upper callan 213, a lower callan, a clamping sleeve 21407, and a cam clamping mechanism. The upper callan 213 and the lower callan 214 are respectively provided with semicircular holes, and the semicircular holes of the upper callan 213 and the lower callan 214 are respectively installed with semicircular clamping sleeves 21407. The two semicircular clamping sleeves are relative to each other to form a circle and the clamping sleeves are installed. The upper callan 213 and the lower callan 214 are located on one side of the expansion and contraction fixing frame 201, and the expansion and contraction hydraulic cylinder 202 is installed on the other side of the expansion and contraction fixing frame 201.

[0038] The cam clamping mechanism is arranged on the inner side of the upper and lower clamping cylinders 213 and the lower clamping cylinder 214, and the expansion and contraction mold is installed between the piston rod of the expansion and contraction hydraulic cylinder 202 and the cam clamping mechanism.

[0039] The cam clamping mechanism includes an L-shaped lower pressing plate, a U-shaped ring 219 and a pressing handle 220. One end of the L-shaped lower pressing plate is vertically arranged at the bottom and hingedly connected to the expansion and contraction fixing frame 201, and the other end is horizontally located above the upper callus 213. A fastening groove 212 is provided at the end of the horizontal line portion of the L-shaped lower pressing plate. Both sides of the open mouth of the U-shaped ring 219 are hingedly connected to the middle part of the pressing handle 220. The inner side end of the pressing handle 220 is hingedly connected to the expansion and contraction fixing frame 201. The pressing handle 220 is pressed downward to drive the U-shaped ring 219 downward. When the U-shaped ring 219 is embedded in the horizontal line portion groove of the L-shaped lower pressing plate, the upper callus 213 and the lower callus are clamped to the pipe fitting to be processed.

[0040] The expansion and contraction tube mold 2 also includes a second fixing component, a threaded seat 20407, a trapezoidal nut 208, an eight-petal lock 206, a pull rod 203, an expansion head 204 and an end shaft 205; the expansion and contraction hydraulic cylinder 202 is a bidirectional hydraulic cylinder, the end of the second piston rod is connected to the pull rod 203 in a threaded manner, the other end of the pull rod 203 is connected to the expansion head 204 and the end shaft 205, the short tube to be expanded is sleeved on the pull rod 203, the threaded seat 20407 is fixed on the cylinder body of the bidirectional hydraulic cylinder, the piston rod passes through the threaded seat 20407, the threaded seat 20407 is provided with a trapezoidal nut 208 and an eight-petal lock 206, the inner end of the short tube to be expanded is sleeved on the eight-petal lock 206 for positioning, and the other end is embedded in the expansion head 204, the expansion head 204 is stretched by the pull rod 203 and embedded in the short tube to be expanded to expand the end of the short tube to be expanded.

[0041] The expansion control valve is arranged at the outer side of the expansion and contraction fixed frame 201, and the expansion fixed valve controls the bidirectional hydraulic cylinder.

[0042] The expansion and contraction fixing frame 201 is provided with an expansion and contraction guard plate 210 of an upward-turning structure at the expansion and contraction mold. The expansion and contraction guard plate 210 is hinged to the expansion and contraction fixing frame 201 and covers the top and both sides of the expansion and contraction mold.

[0043] The working principle of the machine is to first fill the front oil tank with hydraulic oil. There is an oil mark hole on the side to check the liquid level. There is an oil plug on the bottom to quickly release the internal oil. The door type and front legs of the bracket are fixed by bolts, which are quick to disassemble and easy to install and transport.

[0044] Bending operation: After power is turned on, the front electric control indicator light will light up, and the positioning hydraulic cylinder will enter the working standby state. There is a pressure gauge on the upper side of the oil block, which displays the current pressure state and is responsible for the connection of each oil pipe circuit. The slideway is fixed to the upper part of one side of the frame. Through the fixing bolts, a slide seat is set at the lower part of the semicircular mold. The slide seat is set on the slideway to ensure that the semicircular mold slides in a straight track during operation. A shield cover plate is provided on the upper side, which is connected by two pins and can be opened to play a protective role. The rotating mold is installed on the left and right supports, and the pipe fittings are placed in the arc-shaped mold groove. Then the positioning hydraulic cylinder is operated and begins to extend, driving the semicircular mold to move forward until the arc-shaped mold groove of the semicircular mold is stuck on the round pipe and keeps it tight. After preparation, operate the control valve to drive the right and left supports to rotate, and drive the two rotating molds to make arc movements, apply tension on both sides of the round pipe, and bend the round pipe as the bending cylinder retracts.

[0045] There is a dial next to the right support on the lower side of the frame with angles engraved on it. The dial is equipped with a pointer connected to the right support. This pointer cooperates with the dial to mark the angle of the bent pipe, so that the bending angle of the round pipe can be observed at any time.

[0046] Pipe expansion and contraction operation: The pipe expansion and contraction mold of this device mainly works back and forth through the two ends of the double-headed oil cylinder. On one side, the clamping sleeve is supported by the upper and lower clamps, and the inner groove of the clamping sleeve increases the friction. The inner hole of the clamping sleeve passes through the outer diameter of the pipe to be processed, and the L-shaped lower pressure plate presses down the upper clamp, and the bottom of the U-shaped ring is stuck in the edge groove of the L-shaped lower pressure plate. Press down the lower pressure handle, pull the U-shaped ring, and completely fix the L-shaped lower pressure plate. This structure is relatively convenient and quick to disassemble.

[0047] The piston rod at this end of the double-outlet oil cylinder is connected to the corresponding expanding die and shrinking die, and the expansion and contraction of the double-headed oil cylinder is controlled to drive the shrinking die or the expanding die to work, and the shrinking die or the expanding die is put in or outside the pipe hole to realize shrinking and expanding work.

[0048] On the other side of the double oil cylinder, the eight petals are locked and placed in the trapezoidal nuts 208 and 209. The trapezoidal nuts are fixed in the threaded seat assembly by bolts. The piston connects the pull rod, the end shaft and the expansion head. The round tube to be processed is installed on the outside of the pull rod, one end is connected to the eight petals for locking, and the other end is fixed in the expansion head. The hydraulic cylinder is controlled to retract and retract through the reversing valve, driving the mold expansion head to expand the hole in the pipe fitting.

Claims

1. A hydraulic pipe bending and expansion and contraction integrated machine, characterized in that: include, A frame (1), a pipe bending die (4) and a pipe expansion and contraction die (2), wherein the pipe bending die (4) is arranged above one side of the frame (1), and the pipe expansion and contraction die (2) is arranged at an end of one side of the frame (1); The pipe bending die (4) comprises a positioning semicircular die (401) and two rotating dies (403), the semicircular die (401) is provided with an arc-shaped die groove (402), the lower part of the semicircular die (401) is arranged on a slideway, the slideway is fixed on the frame (1), a pipe bending positioning hydraulic cylinder (406) is arranged at the rear end of the semicircular die (401), the rotating die (403) is provided with an arc-shaped die groove (402), the lower end of which is hingedly connected to the frame (1), and the arc-shaped die grooves (402) of the two semicircular dies (401) can rotate between being concentric and at a certain angle, and the angle is less than 180 The angle between the two sides of the arc-shaped die groove (402) on the semicircular die (401) is greater than the angle between the extension lines of the two sides of the arc-shaped die groove (402) on the semicircular die (401), the outer side of the rotating die (403) is connected to the front end of the piston rod of the pipe bending hydraulic cylinder, the cylinder body of the pipe bending hydraulic cylinder is hingedly connected to the frame (1), and the pipe to be bent is placed in the arc-shaped die groove (402) between the semicircular die (401) and the two rotating dies (403); The expansion and contraction pipe mold (2) comprises a fixed component, an expansion and contraction mold and an expansion and contraction hydraulic cylinder (202); the expansion and contraction hydraulic cylinder (202) is fixed on a frame (1); the fixed component is arranged at the piston rod end of the expansion and contraction hydraulic cylinder (202); the expansion and contraction mold is arranged at the piston rod end of the expansion and contraction hydraulic cylinder (202); the pipe to be expanded and contracted is fixed by the fixed component; and the expansion and contraction mold is located at the end of the pipe to be expanded and contracted.

2. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 1, characterized in that: The fixing assembly comprises an expansion and contraction fixing frame (201), an upper calliper (213), a lower calliper, a clamping sleeve (21407), and a cam clamping mechanism. The upper calliper (213) and the lower calliper (214) are respectively provided with semicircular holes. The semicircular holes of the upper calliper (213) and the lower calliper (214) are respectively installed with semicircular clamping sleeves (21407). The two semicircular clamping sleeves are arranged relative to each other to form a circle and are installed with the clamping sleeves. The upper calliper (213) and the lower calliper (214) are located on one side of the expansion and contraction fixing frame (201). The expansion and contraction hydraulic cylinder (202) is installed on the other side of the expansion and contraction fixing frame (201). The cam clamping mechanism is arranged on the inner sides of the upper calliper (213) and the lower calliper (214). An expansion and contraction mold is installed between the piston rod of the expansion and contraction hydraulic cylinder (202) and the cam clamping mechanism.

3. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 2, characterized in that: The cam clamping mechanism comprises an L-shaped lower pressing plate, a U-shaped ring (219) and a pressing handle (220), one end of the L-shaped lower pressing plate is arranged vertically at the bottom and is hingedly connected to the expansion and contraction fixing frame (201), and the other end is horizontally located above the upper calliper (213), and a fastening groove (212) is provided at the end of the transverse line portion of the L-shaped lower pressing plate, and both sides of the open mouth of the U-shaped ring (219) are hingedly connected to the middle part of the pressing handle (220), and the inner side end of the pressing handle (220) is hingedly connected to the expansion and contraction fixing frame (201), and the pressing handle (220) is pressed downward to drive the U-shaped ring (219) downward, and when the U-shaped ring (219) is embedded in the groove of the transverse line portion of the L-shaped lower pressing plate, the upper calliper (213) and the lower calliper are clamped to the pipe fitting to be processed.

4. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 3 is characterized in that: The expansion and contraction tube mold (2) further comprises a second fixing assembly, a threaded seat (20407), a trapezoidal nut (208), an eight-petal lock (206), a pull rod (203), an expansion head (204) and an end shaft (205); the expansion and contraction hydraulic cylinder (202) is a bidirectional hydraulic cylinder, the end of the second piston rod is connected to the pull rod (203) in a threaded manner, the other end of the pull rod (203) is connected to the expansion head (204) and the end shaft (205), and the short tube to be expanded is sleeved on the pull rod The threaded seat (20407) is fixed on the cylinder body of the bidirectional hydraulic cylinder, the piston rod passes through the threaded seat (20407), a trapezoidal nut (208) and an eight-petal lock (206) are arranged in the threaded seat (20407), the inner end of the short tube to be expanded is sleeved on the eight-petal lock (206) for positioning, and the other end is embedded in the expansion head (204), and the expansion head (204) is stretched by the pull rod (203) and embedded in the short tube to be expanded to expand the end of the short tube to be expanded.

5. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 4 is characterized in that: It also includes a pipe expansion control valve, which is arranged at an outer position of the expansion and contraction fixed frame (201). The pipe expansion fixed valve controls the bidirectional hydraulic cylinder. The expansion and contraction fixed frame (201) is provided with an expansion and contraction guard plate (210) with an upward flip structure at the expansion and contraction mold. The expansion and contraction guard plate (210) is hinged to the expansion and contraction fixed frame (201) and covers the top and both sides of the expansion and contraction mold.

6. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 1, characterized in that: The rotating die (403) is arranged on a support, and a stretching ear plate (408) is arranged on the lower part of the support extending outward, and the stretching ear plate (408) is hingedly connected to the front end of the piston rod of the bending hydraulic cylinder. A pair of rotating ear plates (4407) is arranged in the middle part of the support, and the frame (1) is provided with a fixing hole seat, and the rotating ear plate (4407) and the fixing empty seat are simultaneously provided with a pin shaft hole (407), and the fixing hole seat is arranged between the two rotating ear plates (4407) and the pin shaft hole (407) is coaxial and a pin (218) is inserted.

7. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 6 is characterized in that: The rotating mold (403) is a rectangular strip, one side of which is provided with the arc-shaped mold groove (402), and the other side is fixed to the support. The two rotating molds (403) and the support and the fixed hole seat are arranged symmetrically relative to the center of the bending pipe positioning hydraulic cylinder (406).

8. The hydraulic pipe bending and expanding and contracting integrated machine according to claim 5 is characterized in that: The frame (1) is in the shape of a portal frame, with an expansion and contraction tube mold (2) provided on one side, and the tube bending mold (4) provided on the other side and the top. Universal wheels are provided at the bottom of the frame (1), a hydraulic station and an electric control box are provided at the bottom, and a control valve is provided on the side.

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