A 9-shaped pipe bending machine

Abstract

The present invention discloses a 9-shaped pipe bending machine, comprising: a frame, a pipe feeding trolley movably arranged on the frame, a machine head mounted at the front of the frame, and a pipe bending arm with a connecting sleeve at one end. The main shaft is vertically supported at the front of the machine head by a bearing assembly. The bottom end of the main shaft extends below the machine head and is connected to a drive device, which drives the main shaft to rotate relative to its own axis. The pipe bending arm is fixedly mounted on the main shaft extending above the machine head by the connecting sleeve. A lower wheel die and a main clamping frame are fixedly mounted on the pipe bending arm. The upper wheel die is mounted on the main clamping frame by a lifting device, and the upper wheel die is located above the lower wheel die. The upper wheel die can be moved downward by the lifting device to mate with the lower wheel die to form a complete pipe bending die cavity for bending 9-shaped pipe parts. The above structure is compact, easy to use and maintain, and is suitable for bending 9-shaped pipe parts.

Description

Technical Field

[0001] The invention relates to a pipe bender, in particular to a 9-shaped pipe bender. Background Art

[0002] With the continuous development of modern science and technology, pipe bending technology has been widely used in various production industries, and pipe bending machines using pipe bending technology have become irreplaceable mechanical equipment in industrial production.

[0003] The common pipe bending machines currently on the market mainly include: a frame, a pipe feeding trolley movably arranged on the frame, a machine head installed at the front of the frame, a main shaft with a wheel module vertically movably supported in the machine head, a pipe bending arm fixedly sleeved on the main shaft, a clamping module installed on the pipe bending arm, and a driving device for driving the pipe bending arm to swing relative to the axis of the main shaft; wherein the clamping module is located on the outside of the wheel module. During the pipe bending process of the pipe bending machine, the feeding trolley clamps the pipe and feeds the front end of the clamped pipe into the mold cavity between the clamping module and the wheel module. The driving device drives the pipe bending arm to swing around the set direction of the bending pipe while the feeding trolley continuously transports the pipe forward until the pipe bending operation is completed. However, the pipe bending arm structure of the above structure is relatively large. Due to the limitation of the swinging space, the maximum swinging angle of the pipe bending arm can only reach 180°. For example, Figure 1 The 9-shaped bend pipe fitting of the structure shown has a swing angle of more than 180° in the bending processing of the head bending part. Therefore, the common pipe bending machines on the market cannot process the 9-shaped bend pipe fittings. The processing of the 9-shaped bend pipe fittings still uses the traditional manual bending method, but the manual bending method has defects such as high labor intensity, low work efficiency, and poor product consistency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a 9-shaped pipe bending machine which has a compact structure, is easy to use and maintain, and can bend 9-shaped pipe parts.

[0005] To solve the above problems, the technical solution adopted by the present invention is: the 9-shaped pipe bending machine comprises: a frame, a pipe feeding trolley movably arranged on the frame, a head installed at the front of the frame, and a pipe bending arm, and a connecting sleeve is provided at one end of the pipe bending arm; the main shaft is vertically supported at the front of the head by a bearing group, and the bottom end of the main shaft extends out from under the head and is connected to the driving device, and the driving device drives the main shaft to rotate relative to its own axis; the pipe bending arm is fixedly sleeved on the main shaft extending above the head through the connecting sleeve, and the lower wheel mold and the main clamping frame are fixedly installed on the pipe bending arm; the upper wheel mold is installed on the main clamping frame by a lifting device, and the upper wheel mold is located above the lower wheel mold. The upper wheel mold can move downward through the lifting device to close the mold with the lower wheel mold to form a complete pipe bending mold cavity for bending 9-shaped pipe parts. Centrally arranging the lifting device and the upper wheel die on the main clamping frame above the lower wheel die can greatly reduce the lateral space occupied by the pipe bending arm. The lower part of the pipe bending arm does not occupy any space. The pipe bending arm is located on the upper part of the machine head, so the swing space of the pipe bending arm is basically not hindered by other components on the frame. The swing angle of the pipe bending arm fully meets the swing angle required for bending the head bending part of the 9-shaped bent pipe.

[0006] In order to ensure that the upper wheel mold can be well closed with the lower wheel mold without shifting in the lateral position, this solution is provided with a downwardly protruding positioning block on the bottom surface of the upper wheel mold, and a positioning hole for the positioning block to extend into is opened downward on the top surface of the lower wheel mold; when the upper wheel mold moves downward through the lifting device to close the mold with the lower wheel mold, the positioning block extends into the positioning hole, thereby locating the position of the upper wheel mold.

[0007] Furthermore, in the aforementioned 9-shaped pipe bending machine, the specific structure of the lower wheel mold is as follows: a first lower wheel mold body and a second lower wheel mold body are spaced apart and protruding upward on the top surface of the lower wheel mold, and the outer contour of the first lower wheel mold body is composed of a quarter-circular straight channel contour, a quarter-circular channel contour that is transitionally connected to the quarter-circular straight channel contour and is in an outwardly convex arc shape, a quarter-circular transition channel contour that is transitionally connected to the quarter-circular channel contour in an outwardly convex arc shape and is in an inwardly convex arc shape, and a quarter-circular auxiliary straight channel contour, which are connected in sequence to form a closed outer contour; at this time, the outer contour of the first lower wheel mold body is similar to a B-shaped cylinder. The second lower wheel die body is located at the opposite surface position of the quarter-circular straight channel contour of the first lower wheel die body, and the inner side surface of the second lower wheel die body and the quarter-circular straight channel contour of the first lower wheel die body constitute a half-circular straight channel; the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body constitute the lower die cavity of the lower half of the head bending part of the 9-shaped bent pipe piece; after the head bending part of the 9-shaped bent pipe piece is sleeved on the second lower wheel die body, the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body constitute the lower die cavity of the lower half of the middle bending part of the 9-shaped bent pipe piece; the upper wheel die structure is : A first upper wheel die body and a second upper wheel die body are spaced apart and protrude downward on the bottom surface of the upper wheel die, the outer contour of the first upper wheel die body and the outer contour of the first lower wheel die body are mirror-symmetrical, and the outer contour of the second upper wheel die body and the outer contour of the second lower wheel die body are mirror-symmetrical; the outer contour of the first upper wheel die body and the inner side surface of the second upper wheel die body constitute an upper die cavity for the upper half of the head bending part of the 9-shaped bent pipe piece; after the head bending part of the 9-shaped bent pipe piece is sleeved on the second upper wheel die body, the outer contour of the first upper wheel die body and the inner side surface of the second upper wheel die body constitute an upper die cavity for the upper half of the middle bending part of the 9-shaped bent pipe piece.

[0008] Among them, the positioning block is usually set in the middle position of the bottom surface of the first upper wheel mold body, and the positioning hole is usually set in the middle position of the top surface of the first lower wheel mold body, which makes the overall structure of the upper and lower wheel molds more compact.

[0009] There are many types of lifting devices. The one in this solution uses a main clamping cylinder. The cylinder body of the main clamping cylinder is fixedly mounted on the main clamping frame. The extension rod of the main clamping cylinder points downward, and the upper wheel mold is fixed to the bottom of the extension rod of the main clamping cylinder. This design makes the overall structure of the lifting device very simple and compact.

[0010] There are many different drive mechanisms. This design utilizes a servo motor, a servo reducer, and a coupling. The servo motor's shaft is fixedly connected to the servo reducer's input shaft, while the servo reducer's output shaft is fixedly connected to the base of the spindle via a coupling. This structure occupies only the space below the spindle, leaving the bending arm's swing angle intact and making the overall structure more compact.

[0011] Figure-9 bends come in a variety of sizes and specifications, and therefore the bend cavity formed by each pair of upper and lower dies also has a variety of sizes. For different sizes of bend cavities, the height of the bend cavity needs to be adjusted, that is, the vertical position of the die head needs to be adjusted so that the pipes transported in the pipe feed trolley are at the same level as the bend cavity. Here, the die head is mounted on the front side of the frame via an up-and-down sliding device. The cylinder body of the die-changing cylinder is fixedly mounted on the frame below the die head. The extension rod of the die-changing cylinder points upward and is fixedly connected to the bottom of the die head. As the rod of the die-changing cylinder extends upward, it pushes the die head upward, driving the bend cavity formed by the upper and lower dies upward. As the rod of the die-changing cylinder retracts downward, it pulls the die head downward, driving the bend cavity formed by the upper and lower dies downward, thereby adjusting the height of the bend cavity.

[0012] Furthermore, in the aforementioned 9-shaped pipe bending machine, an auxiliary push die sleeve assembly is installed on the machine head, and the auxiliary push die sleeve assembly includes: an auxiliary push mounting seat, the auxiliary push die sleeve is installed on the auxiliary push mounting seat through a front-rear sliding device, the cylinder body of the auxiliary push oil cylinder is fixedly installed on the auxiliary push mounting seat, the extension rod of the auxiliary push oil cylinder points forward, and the extension rod of the auxiliary push oil cylinder is fixedly connected to the auxiliary push die sleeve; the front end of the pipe transported in the pipe feeding trolley passes through the auxiliary push die sleeve and extends into the pipe bending die cavity. The driving device drives the pipe bending arm to swing around the set direction of the pipe bending while the feeding trolley continuously transports the pipe forward until the pipe bending operation is completed; during the pipe bending operation, the extension rod of the auxiliary push oil cylinder also extends forward at a uniform speed, so that the auxiliary push die sleeve uniformly pushes the pipe; after the pipe bending operation is completed, the extension rod of the auxiliary push oil cylinder retracts backward to its original position.

[0013] The beneficial effects of the present invention are as follows: the 9-shaped pipe bending machine has a compact structure, is easy to use and maintain, and is suitable for bending 9-shaped pipe parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a 9-shaped elbow.

[0015] Figure 2 It is a structural schematic diagram of a 9-shaped pipe bending machine described in the present invention.

[0016] Figure 3 yes Figure 1Schematic diagram of the locally enlarged structure in .

[0017] Figure 4 yes Figure 2 Schematic diagram of the locally enlarged structure viewed from above.

[0018] Figure 5 yes Figure 3 Schematic diagram of the structure of the middle and upper wheel mold.

[0019] Figure 6 yes Figure 5 Schematic diagram of the structure looking upwards.

[0020] Figure 7 yes Figure 3 Schematic diagram of the structure of the middle and lower wheel molds.

[0021] Figure 8 yes Figure 7 Schematic diagram of the local structure from the top view.

[0022] Figure 9 This is a schematic diagram of the bending state of the pipe in the lower wheel die when the head bending part of the 9-shaped bent pipe is bent.

[0023] Figure 10 This is a schematic diagram of the bending state when the middle bending part of the 9-shaped bent pipe is bent and the pipe is located in the lower wheel mold. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0025] The structure of the 9-shaped elbow 1 to be processed is as follows Figure 1 As shown, the 9-shaped pipe bend 1 requires two bending processes: bending the head bending portion 11 and bending the middle bending portion 11. The bending angle of the head bending portion 11 is approximately 260 degrees. Currently available pipe benders can only achieve a maximum bending angle of 180 degrees, which is completely unsuitable for bending the 9-shaped pipe bend 1. Therefore, the applicant has designed a 9-shaped pipe bender with a bending arm swing angle that fully meets the swing angle required for bending the head bending portion of the 9-shaped pipe bend.

[0026] The common pipe bending machine on the market includes: a frame 2, a pipe feeding trolley movably arranged on the frame 2, a head 21 installed at the front of the frame 2, and a pipe bending arm 3, with a connecting sleeve 31 provided at one end of the pipe bending arm 3. The 9-shaped pipe bending machine described in this solution is based on the above and has the following improved designs: Figure 2 and Figure 3As shown, the main shaft 22 is vertically supported at the front of the machine head 21 by a bearing assembly. The bottom end of the main shaft 22 extends below the machine head 21 and is connected to a drive device, which drives the main shaft 22 to rotate relative to its own axis. The pipe bending arm 3 is fixedly mounted on the main shaft 22 extending above the machine head 21 via a connecting sleeve 31. The lower wheel die 4 and the main clamping frame 5 are fixedly mounted on the pipe bending arm 3. The upper wheel die 6 is mounted on the main clamping frame 5 via a lifting device and is located above the lower wheel die 4. The upper wheel die 6 can be moved downward by the lifting device until it mates with the lower wheel die 4, forming a complete pipe bending mold cavity for bending the 9-shaped pipe bend 1.

[0027] Here, the lifting device and the upper wheel mold 6 are all centrally arranged on the main clamping frame 5 above the lower wheel mold 4, which can greatly reduce the lateral space occupied by the bending arm 3. The lower part of the bending arm 3 does not occupy any space. The bending arm 3 is located above the machine head 21, so the swing space of the bending arm 3 is basically not hindered by other components on the frame 2. Therefore, the swing angle of the bending arm 3 fully meets the swing angle required for bending the head bending part 11 of the 9-shaped bending pipe 1. Figure 4 As shown, the swing angle α of the bending arm 3 from position A to position B can reach about 270 degrees.

[0028] In order to ensure that the upper mold wheel 6 can be well closed with the lower mold wheel 4 without shifting in the lateral position, the present invention provides a positioning structure to guide the upper mold wheel 6 to be closed at the desired position: Figure 5 and Figure 7 As shown, a downwardly protruding positioning block 61 is provided on the bottom surface of the upper die wheel 6, and a positioning hole 41 is provided downwardly on the top surface of the lower die wheel 4 for the positioning block 61 to extend into. When the upper die wheel 6 moves downward by the lifting device to close the mold with the lower die wheel 4, the positioning block 61 extends into the positioning hole 41, which serves to locate the position of the upper die wheel 6, ensuring that there is no lateral misalignment in the mold cavity of the bent pipe after the mold is closed, further improving the quality of the bent pipe.

[0029] The mold cavity of the lower wheel mold 4 is a lower mold cavity 40 for bending the lower half of the head bending part 11 and the lower half of the middle bending part 11 of the 9-shaped bent pipe 1 placed flat. Figure 7 and Figure 8As shown, the specific structure of the lower wheel mold 4 is as follows: a first lower wheel mold body 42 and a second lower wheel mold body 43 are spaced apart and protrude upward from the top surface of the lower wheel mold 4. The outer contour of the first lower wheel mold body 42 is composed of a quarter-circular straight channel contour 421, a quarter-circular channel contour 422 that transitions to the quarter-circular straight channel contour 421 and forms an outwardly convex arc shape, a quarter-circular transition channel contour 423 that transitions to the outwardly convex arc shape and forms an inwardly convex arc shape, and a quarter-circular auxiliary straight channel contour 424, which are sequentially connected to form a closed outer contour. The outer contour of the first lower wheel mold body 42 is similar to a B-shaped cylinder. The second lower wheel mold body 43 is located opposite the quarter-circular straight channel contour 421 of the first lower wheel mold body 42. At this time, the inner side surface 431 of the second lower wheel mold body 43 faces the quarter-circular straight channel contour 421 of the first lower wheel mold body 42. The inner side surface 431 of the second lower wheel die body 43 is a quarter-circular straight channel profile that is mirror-symmetrical to the quarter-circular straight channel profile 421 of the first lower wheel die body 42. Together, the inner side surface 431 of the second lower wheel die body 43 and the quarter-circular straight channel profile 421 of the first lower wheel die body 42 form a half-circular straight channel 44. The outer contour of the first lower wheel die body 42 and the inner side surface 431 of the second lower wheel die body 43 form the lower die cavity 40 for bending the lower half of the head bent portion 11 of the 9-shaped bent pipe member 1. After the head bent portion 11 of the 9-shaped bent pipe member 1 is sleeved onto the second lower wheel die body 43, the outer contour of the first lower wheel die body 42 and the inner side surface 431 of the second lower wheel die body 43 form the lower die cavity 40 for bending the lower half of the middle bent portion 12 of the 9-shaped bent pipe member 1.

[0030] The mold cavity of the upper wheel mold 6 is an upper mold cavity 60 for bending the upper half of the head bending part 11 and the upper half of the middle bending part 11 of the 9-shaped bent pipe 1 placed flat. Figure 5 and Figure 6 As shown, the specific structure of the upper wheel die 6 is as follows: a first upper wheel die body 62 and a second upper wheel die body 63 protrude downwardly from the bottom surface of the upper wheel die 6 at intervals. The outer contour of the first upper wheel die body 62 is mirror-symmetrical to the outer contour of the first lower wheel die body 42, also forming a shape similar to a B-shaped cylinder. The outer contour of the second upper wheel die body 62 and the outer contour of the second lower wheel die body 42 are mirror-symmetrical. The outer contour of the first upper wheel die body 62 and the inner surface 631 of the second upper wheel die body 63 form the upper die cavity 60 for bending the upper half of the head bending portion 11 of the 9-shaped bent pipe member 1. After the head bending portion 11 of the 9-shaped bent pipe member 1 is inserted into the second upper wheel die body 63, the outer contour of the first upper wheel die body 62 and the inner surface 631 of the second upper wheel die body 63 form the upper die cavity 60 for bending the upper half of the middle bending portion 12 of the 9-shaped bent pipe member 1.

[0031] The upper mold cavity 60 and the lower mold cavity 40 are combined to form a complete bending mold cavity. For the convenience of description, the bending process of the pipe inserted into the lower mold cavity 40 is described in detail. After the front end of the pipe is inserted into the inner side surface 431 of the second lower wheel mold body 43 and the quarter-circular straight channel profile 421 of the first lower wheel mold body 42 to form a half-circular straight channel 44, the bending arm swings around the set direction of the bending pipe to form the head bending portion 11 of the 9-shaped bending pipe part 1. The bent head bending portion 11 is as shown in FIG. Figure 9 Then, the head bending portion of the 9-shaped bend pipe is placed on the second lower wheel die body 43. At this time, the outer contour of the first lower wheel die body 42 and the inner side surface 431 of the second lower wheel die body 43 form the lower die cavity 40 for bending the lower half of the middle bending portion 12 of the 9-shaped bend pipe 1. The bending arm swings around the set direction of the bend to bend the middle bending portion 12 of the 9-shaped bend pipe 1. The bent middle bending portion 12 is shown as follows. Figure 10 shown.

[0032] Among them, the positioning block 61 on the bottom surface of the upper wheel mold 6 is usually set in the middle position of the bottom surface of the first upper wheel mold body 62, and the positioning hole 41 on the top surface of the lower wheel mold 4 is usually set in the middle position of the top surface of the first lower wheel mold body 42, thereby making the structure of the lower wheel mold 4 and the upper wheel mold 6 more compact.

[0033] There are many types of lifting devices. The lifting device in this solution uses a main clamping cylinder 51, such as Figure 3 As shown, the main clamping cylinder 51 is fixedly mounted on the main clamping frame 5, with its extension rod pointing downward. The upper wheel mold 6 is fixedly mounted at the bottom of the extension rod. As the extension rod of the main clamping cylinder 51 extends downward, it pushes the upper wheel mold 6 downward until it closes with the lower wheel mold 4. As the extension rod of the main clamping cylinder 51 retracts upward, it pulls the upper wheel mold 6 upward, away from the lower wheel mold 4. To enhance the overall strength of the main clamping frame 5, a reinforcing rib structure may also be provided.

[0034] There are many forms of driving devices. The driving device in this solution uses a servo motor 71, a servo reducer 72 and a coupling 73, such as Figure 2 As shown, the motor shaft of the servo motor 71 is fixedly connected to the input shaft of the servo reducer 72, and the output shaft of the servo reducer 72 is fixedly connected to the bottom of the main shaft 22 via a coupling 73. The drive device using the above structure only occupies the space below the main shaft 22 and does not limit the swing angle of the bending arm 3 at all.

[0035] The 9-shaped pipe bend 1 has various sizes and specifications: for example, different outer pipe diameters. Therefore, the sizes of the complete pipe bending assembly molds composed of the upper wheel mold 4 and the lower wheel mold 6 also have various specifications. For pipe bending assembly molds of different specifications, it is necessary to adjust the height of the pipe bending mold cavity in the corresponding pipe bending assembly mold, that is, it is necessary to adjust the vertical position of the head 21 so that the pipe conveyed in the pipe feeding trolley and the position of the pipe bending mold cavity are at the same level. Figure 2 As shown, here the machine head 21 is mounted on the front side of the frame 2 via an up-and-down sliding device. The up-and-down sliding structure can adopt a slider guide structure commonly found on the market. The cylinder body of the mold-changing oil cylinder 23 is fixedly mounted on the frame 2 below the machine head 21. The extension rod 231 of the mold-changing oil cylinder 23 points upward, and the extension rod 231 of the mold-changing oil cylinder 23 is fixedly connected to the bottom of the machine head 21. In the process of the extension rod 231 of the mold-changing oil cylinder 23 extending upward, the machine head 21 is pushed upward, driving the bending mold cavity formed by the upper wheel mold 6 and the lower wheel mold 4 to move upward; in the process of the extension rod 231 of the mold-changing oil cylinder 23 retracting downward, the machine head 21 is pulled downward, driving the bending mold cavity formed by the upper wheel mold 6 and the lower wheel mold 4 to move downward, thereby adjusting the height position of the bending mold cavity.

[0036] like Figure 4 As shown, this embodiment features an auxiliary push die sleeve assembly mounted on the machine head 21. The auxiliary push die sleeve assembly comprises an auxiliary push mounting base 81, an auxiliary push die sleeve 82 mounted on the auxiliary push mounting base 81 via a forward and backward sliding mechanism. The forward and backward sliding mechanism can utilize a common commercially available slider guide structure. The cylinder body of an auxiliary push cylinder 83 is fixedly mounted on the auxiliary push mounting base 81, with the extension rod of the auxiliary push cylinder 83 pointing forward and fixedly connected to the auxiliary push die sleeve 82. The front end of the pipe conveyed by the pipe feed trolley passes through the auxiliary push die sleeve 82 and extends into the bending die cavity. While the drive device drives the bending arm 3 to swing in the set bending direction, the feed trolley continuously conveys the pipe forward until the bending operation is completed. During the bending operation, the extension rod of the auxiliary push cylinder 83 also extends forward at a constant speed, causing the auxiliary push die sleeve 82 to continuously push the pipe. Upon completion of the bending operation, the extension rod of the auxiliary push cylinder 83 retracts back to its original position.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention shall still fall within the scope of protection required by the present invention.

Claims

1. A 9-shaped pipe bender, comprising: The machine frame comprises a pipe feeding trolley movably arranged on the machine frame, a machine head installed at the front of the machine frame, and a pipe bending arm, wherein a connecting sleeve is provided at one end of the pipe bending arm; the main shaft is vertically supported at the front of the machine head by a bearing group, the bottom end of the main shaft extends below the machine head and is connected to a driving device, and the driving device drives the main shaft to rotate relative to its own axis; the pipe bending arm is fixedly sleeved on the main shaft extending above the machine head through a connecting sleeve, and a lower wheel die and a main clamping frame are fixedly installed on the pipe bending arm; an upper wheel die is installed on the main clamping frame by a lifting device, and the upper wheel die is located above the lower wheel die. The upper wheel die can be moved downward by the lifting device to engage with the lower wheel die to form a complete pipe bending die cavity for bending 9-shaped pipe parts; A downwardly protruding positioning block is provided on the bottom surface of the upper wheel mold, and a positioning hole for the positioning block to extend into is provided downwardly on the top surface of the lower wheel mold; when the upper wheel mold moves downward by the lifting device to close the mold with the lower wheel mold, the positioning block extends into the positioning hole; On the top surface of the lower wheel die, there are spaced apart and upwardly protruding a first lower wheel die body and a second lower wheel die body. The outer contour of the first lower wheel die body is formed by a quarter-circular straight channel contour, a quarter-circular channel contour transitionally connected to the quarter-circular straight channel contour and in an outwardly convex arc shape, a quarter-circular transition channel contour transitionally connected to the outwardly convex arc shape and in an inwardly convex arc shape, and a quarter-circular auxiliary straight channel contour, which are connected in sequence to form a closed outer contour; the second lower wheel die body is located at the opposite surface position of the quarter-circular straight channel contour of the first lower wheel die body, and the inner side surface of the second lower wheel die body and the quarter-circular straight channel contour of the first lower wheel die body form a half-circular straight channel; the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body form a lower die cavity for the lower half of the head bending part of the 9-shaped bent pipe piece; After the head bending portion of the 9-shaped bent pipe piece is sleeved on the second lower wheel die body, the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body constitute the lower die cavity for bending the lower half of the middle bending portion of the 9-shaped bent pipe piece; the upper wheel die structure is as follows: the first upper wheel die body and the second upper wheel die body are spaced downwardly and protruded on the bottom surface of the upper wheel die, the outer contour of the first upper wheel die body and the outer contour of the first lower wheel die body are mirror-symmetrical, and the outer contour of the second upper wheel die body and the outer contour of the second lower wheel die body are mirror-symmetrical; the outer contour of the first upper wheel die body and the inner side surface of the second upper wheel die body constitute the upper die cavity for bending the upper half of the head bending portion of the 9-shaped bent pipe piece; after the head bending portion of the 9-shaped bent pipe piece is sleeved on the second upper wheel die body, the outer contour of the first upper wheel die body and the inner side surface of the second upper wheel die body constitute the upper die cavity for bending the upper half of the middle bending portion of the 9-shaped bent pipe piece; A downwardly protruding positioning block is provided in the middle position of the bottom surface of the first upper wheel mold body, and a positioning hole for the positioning block to extend into is opened downwardly in the middle position of the top surface of the first lower wheel mold body; when the upper wheel mold moves downward through the lifting device to close the mold with the lower wheel mold, the positioning block extends into the positioning hole.

2. A 9-shaped pipe bender according to claim 1, characterized in that: The lifting device includes: a main clamping oil cylinder, the cylinder body of the main clamping oil cylinder is fixedly installed on the main clamping frame, the extension rod of the main clamping oil cylinder points downward, and the upper wheel mold is fixedly installed at the bottom of the extension rod of the main clamping oil cylinder.

3. The 9-shaped pipe bender according to claim 1, characterized in that: The driving device includes: a servo motor, a servo reducer and a coupling. The motor shaft of the servo motor is fixedly connected to the input shaft of the servo reducer, and the output shaft of the servo reducer is fixedly connected to the bottom of the main shaft through the coupling.

4. The 9-shaped pipe bender according to claim 1, characterized in that: The machine head is installed on the front side of the frame through an up and down sliding device. The cylinder body of the mold changing cylinder is fixedly installed on the frame below the machine head. The extension rod of the mold changing cylinder points upward and is fixedly connected to the bottom of the machine head.

5. The 9-shaped pipe bender according to claim 1, characterized in that: An auxiliary push die sleeve assembly is installed on the machine head, and the auxiliary push die sleeve assembly includes: an auxiliary push mounting seat, the auxiliary push die sleeve is installed on the auxiliary push mounting seat through a front and rear sliding device, the cylinder body of the auxiliary push oil cylinder is fixedly installed on the auxiliary push mounting seat, the extension rod of the auxiliary push oil cylinder points forward, and the extension rod of the auxiliary push oil cylinder is fixedly connected to the auxiliary push die sleeve; the front end of the pipe transported in the pipe feeding trolley passes through the auxiliary push die sleeve and extends into the bending pipe die cavity.

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