Multi-angle pipe forming machine of a mold

Abstract

The application provides a multi-angle pipe forming machine of a die, and belongs to the technical field of die manufacturing. The application solves the problem of how to improve the die manufacturing efficiency by improving the bending efficiency and bending quality of the steel pipe. The forming machine comprises a workbench and a base. The front end of the base is fixedly connected with a primary positioning block, and the rear end of the base is fixedly connected with a positioning clamping block. A fixed shaft is fixed on the workbench close to the rear end of the base. A bending scale disc and a connecting rod are respectively sleeved on the fixed shaft and rotationally connected. The free end of the connecting rod is hingedly connected with a bending block. A clamping opening for bending the steel pipe is formed between the bending block and the bending scale disc. The bending block has a zero scale line and can revolve around the axis of the bending scale disc. A scale sleeve is rotationally connected to the primary positioning block. The axis of the scale sleeve is arranged along the length direction of the base and is perpendicular to the axis of the bending scale disc. The machine can meet the use requirement of accurate multi-angle bending of different planes of the die steel pipe and is beneficial to improving the overall manufacturing efficiency of the die.

Description

Technical Field

[0001] The invention belongs to the technical field of mold manufacturing and relates to a multi-angle pipeline forming machine for a mold. Background Art

[0002] Hot runner molds utilize a heating device to prevent the melt in the runner from solidifying. Hot runner technology is widely used in industrially developed countries and regions worldwide because of its numerous advantages, including shortening molding cycles, saving plastic raw materials, reducing waste, improving product quality, eliminating subsequent steps, and facilitating production automation.

[0003] In hot runner molds, to produce high-quality finished products, improve the surface finish of plastic films, and reduce the scrap rate of finished products, it is best to maintain the injection mold at a constant temperature. The most commonly used temperature control method is to control the temperature inside the mold by designing a cooling pipe structure. For example, in an injection mold for producing front door handle covers disclosed in Chinese patent [Authorization Announcement No.: CN216068432U], the cooling pipe needs to be arranged according to the cooling needs of the hot runner. The entire cooling pipe is complex and requires a large number of bending processes.

[0004] In the prior art, for the steel pipes of the above-mentioned cooling pipelines, workers generally bend the steel pipes using tools such as steel pipe sleeves and wrenches. However, the existing processing methods have the following defects: on the one hand, it is time-consuming and labor-intensive for workers to bend the steel pipes using existing tools, and the efficiency is relatively low. In addition, the bending angle and length of the steel pipes are difficult to control. When bending at multiple angles, it is easy to get the direction wrong, and the pipes are not accurate enough, and the quality is poor. When installed on the mold, they are prone to interference with each other, resulting in a high scrap rate of steel pipes, which seriously affects the mold manufacturing efficiency. On the other hand, the steel pipes bent by workers based on their experience are often difficult to standardize. When installed on the mold, there are overlapping and uneven spacing, which complicates the mold assembly and greatly affects the mold manufacturing efficiency. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a multi-angle pipe forming machine for the mold. The technical problem to be solved by the present invention is how to improve the manufacturing efficiency of the mold by improving the bending efficiency and bending quality of the steel pipe.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A multi-angle pipeline forming machine for a mold, comprising a workbench and a base fixed on the workbench and in the shape of an elongated strip, characterized in that the front end of the base is fixedly connected to an initial positioning block with a placement groove, the rear end of the base is fixedly connected to a positioning clamping block with a positioning groove, a fixed shaft arranged vertically is fixed on the workbench near the rear end of the base, a bending dial with a scale and a connecting rod are respectively sleeved on the fixed shaft, and the free end of the connecting rod is fixed to the front end of the base. A bending block is hingedly connected, and a clamp for bending the steel pipe is formed between the bending block and the bending dial. The bending block has a zero scale mark and can revolve around the axis of the bending dial. The initial positioning block is rotatably connected to a cylindrical scale sleeve with a scale on the outer circumference. The axis of the scale sleeve is arranged along the length direction of the base and is perpendicular to the axis of the bending dial. The scale sleeve has a mounting hole connected to the mounting groove, and the outer circumference of the scale sleeve is also provided with a plurality of positioning screws that can be inserted into the mounting holes.

[0007] Different from the bending tools in the prior art that are simple, fragmented, and require the workers' manual experience to operate, the present invention provides a standardized operating platform for workers' bending processing by designing a complete set of pipe forming machines, so that the steel pipes used in the mold can be bent in different planes, at multiple angles, and with precision and standard without relying on manual experience. Specifically, the pipe forming machine is designed by designing a workbench and a base on the workbench. An initial positioning block is designed at the front end of the base, and a placement groove is provided on the initial positioning block. The placement groove is used for placing the steel pipe and also provides an initial positioning. Subsequently, a positioning clamp is provided at the rear end of the base, and a positioning groove is provided in the positioning clamp. The positioning groove is used to position the steel pipe so that the steel pipe will not move radially. In other words, the design of the initial positioning block and the positioning clamp allows the steel pipe to be placed and positioned on the base; on this basis, a bending dial and a bending block are designed at the rear end near the base, and a groove is formed between the two for positioning. The clamp for bending the steel pipe, and there is a scale on the bending dial, and there is a zero scale mark on the bending block. When the steel pipe needs to be bent, the worker only needs to control the bending block to revolve relative to the bending dial, and refer to the position of the scale on the bending dial corresponding to the zero scale line, so that the bending angle of the steel pipe can be accurately controlled; when the steel pipe completes the bending operation on a reference plane (such as a horizontal plane), further, when the steel pipe needs to complete the bending operation on another plane with a different angle (such as a vertical plane), in the present invention, a scale sleeve with a cylindrical shape and a scale on the outer circumference is rotated on the initial positioning block, and the scale is The scale sleeve is provided with a placement hole communicated with the placement groove, and the placement hole is used for the steel pipe to pass through, and the steel pipe and the scale sleeve can be locked by the design of the positioning screw, so that when the steel pipe rotates, the scale sleeve can also rotate accordingly. At the same time, since the axis of the scale sleeve is arranged along the length direction of the base and is perpendicular to the axis of the bending dial, that is, according to the angle between the two planes, the posture of the steel pipe can be accurately adjusted to the plane required for bending by simply rotating the steel pipe to the corresponding angle according to the scale sleeve, and then accurately bending is performed through the cooperation of the above-mentioned bending block and the bending dial. Therefore, Through the coordinated design of the above-mentioned scale sleeve, bending scale plate and surrounding structure, the steel pipe can be accurately bent at multiple angles in different planes, thereby avoiding the need for repeated bending adjustments of existing steel pipes, or even scrapping due to incorrect bending, thereby greatly improving the bending efficiency and ultimately greatly improving the manufacturing efficiency of the mold; in addition, through this pipe forming machine, the bending processing of the steel pipe has a scale reference, and there is no need to rely on experience and feel. The bending angles of the processed steel pipes are unified and standardized, and the bending quality is good, which is conducive to the neat layout of the steel pipe installed on the mold, thereby facilitating the assembly and installation of the mold, and also helping to improve the manufacturing efficiency of the mold.

[0008] In the multi-angle pipe forming machine for the above-mentioned mold, the base has a scale arranged along the length direction of the base, and the base is also slidably connected to a length positioning block that can slide along the length direction of the base. The length positioning block is provided with a locking screw for locking the length positioning block to the steel pipe. Through the design of the above-mentioned length positioning block and scale, when the steel pipe is placed and positioned on the base, it is only necessary to control the locking screw to lock the steel pipe and the length positioning block together. In this way, when the steel pipe is moved to adjust the bending length, it can be precisely adjusted and controlled with reference to the scale, which is conducive to improving the accuracy of the steel pipe bending process and improving the bending quality. It is also conducive to the standardized installation of the steel pipe on the mold, avoiding rework, and ultimately improving the manufacturing efficiency of the mold.

[0009] In the multi-angle pipe forming machine of the above-mentioned mold, the length positioning block has a through hole, and the locking screw can extend into the through hole. Through the above design, the length positioning block and the steel pipe are locked.

[0010] In the multi-angle pipe forming machine of the above-mentioned mold, the positioning clamp includes a half clamp 1 fixed on the base and a half clamp 2 slidably connected to the base along the width direction of the base, the positioning groove is formed between the half clamp 1 and the half clamp 2, and an inclined adjustment slide is provided on the outer side of the half clamp 2, and a locking screw is provided on the half clamp 2 that can lock the half clamp 2 on the base, and the bending dial includes an upper half dial and a lower half dial which are sleeved on the fixed shaft, and a positioning ring groove for adapting to the diameter size of the steel pipe is provided between the upper half dial and the lower half dial, the upper half dial is fixedly connected to the fixed shaft, and the lower half dial is slidably matched with the fixed shaft, and a slider is fixed on the lower half dial, and the slider is slidably connected in the adjustment slide. With the above design, it is only necessary to loosen the locking screw and slide the second half clamp along the width direction of the base to adjust the width of the positioning groove. Moreover, since the adjustment slide is arranged at an angle and the lower half dial slides with the fixed shaft, that is, while the second half clamp is moving, the lower half dial will move relative to the fixed shaft driven by the slider, so that the width of the positioning ring groove is also adjusted. Therefore, with the above design, it is only necessary to move the second half clamp in one action to achieve the width adjustment of the positioning groove and the positioning ring groove, so that the pipeline forming machine can be suitable for bending multiple steel pipes with different diameters. It is a multi-purpose machine with good versatility and easy adjustment.

[0011] In the multi-angle pipe forming machine for the aforementioned mold, the bending block is block-shaped and has a first bevel near the positioning clamp. The bending scale is fan-shaped and has a second bevel near the positioning clamp. An "eight"-shaped notch is formed between the first and second bevels and communicates with the clamping jaws. This design facilitates smooth passage of the steel pipe from the positioning groove into the clamping jaws for bending, thereby improving bending efficiency and, in turn, mold manufacturing efficiency.

[0012] In the multi-angle pipe forming machine using the aforementioned mold, the bending block has a stopper. When the zero mark on the bending block aligns with the zero mark on the scale on the bending dial, the stopper abuts against the outer surface of the connecting rod. This design prevents the bending block from rotating relative to the connecting rod before it begins orbiting the bending dial to perform the bending process. This prevents premature compression of the steel pipe and ensures that the clamping angle formed by the bending block and the bending dial remains unchanged. This, in turn, facilitates precise control of the subsequent bending angle of the steel pipe and improves bending quality.

[0013] In the aforementioned multi-angle pipe forming machine, the bending block is secured with a horizontal handle parallel to the base and a vertical handle perpendicular to the base. These handles facilitate multi-angle bending operations while also making it easier for workers to apply force, saving effort and improving bending efficiency, which in turn increases mold manufacturing efficiency.

[0014] In the multi-angle pipe forming machine for the mold, an auxiliary handle perpendicular to the base is fixed near the rear end of the base. This design makes it easier for workers to apply force, making the bending operation more labor-saving, thereby improving bending efficiency and further improving mold manufacturing efficiency.

[0015] In the aforementioned multi-angle pipe forming machine, several auxiliary positioning blocks are spaced apart on the base between the primary positioning block and the positioning clamping block. Each of these auxiliary positioning blocks is provided with auxiliary positioning slots. This design of auxiliary positioning blocks facilitates accurate and stable positioning of the steel pipe, thereby enhancing the precision of the multi-angle bending of the steel pipe.

[0016] In the multi-angle pipe forming machine using the aforementioned mold, the rear end of the positioning groove has a circular chamfer on one side of the groove wall, and the front end of the positioning groove also has a circular chamfer on the other side of the groove wall. This circular chamfer design prevents interference at the bend of the steel pipe, facilitating the bending operation and making it more labor-saving. Furthermore, this design also makes the steel pipe less likely to break and become scrapped.

[0017] In the multi-angle pipe forming machine of the mold, a fixed sleeve is fixed on the initial positioning block, and the scale sleeve is arranged on the fixed sleeve and the two are rotatably connected via a bearing. Through the above design, the rotational connection and cooperation between the scale sleeve and the initial positioning block are achieved.

[0018] The multi-angle pipe forming machine for the aforementioned mold further includes a frame fixed beneath a workbench, with rollers disposed around the bottom of the frame. A ground locking rod is also disposed at the bottom of the frame, one end of which is threadedly connected to the frame, and the other end of which extends toward the ground and is fixedly connected to a locking block. This design allows for the machine to be mobile and conveniently operated.

[0019] Compared with the existing technology, the multi-angle pipe forming machine of this mold has the following advantages: 1. This machine can meet the use requirements of precise multi-angle bending of steel pipes in different planes for molds. Through this machine, the bending angle and length of the bent steel pipe can be precisely controlled without relying on the worker's feel. The bending processing standards are unified, which can avoid the scrapping of steel pipes due to incorrect bending, greatly reducing the scrap rate of steel pipe bending processing. At the same time, it can also greatly improve the bending efficiency and bending quality of steel pipes for molds, thereby improving the overall manufacturing efficiency of the mold; 2. This machine has a simple structure, labor-saving operation, easy use, and good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the multi-angle pipe forming machine.

[0021] Figure 2 This is a schematic diagram of the local structure of the base of the multi-angle pipe forming machine.

[0022] Figure 3 This is a schematic diagram of the local structure of the bending dial in the multi-angle pipe forming machine.

[0023] Figure 4 This is a partial exploded diagram of the structure of the positioning clamp and bending dial in this multi-angle pipe forming machine.

[0024] In the figure, 1, workbench; 2, frame; 3, base; 4, initial positioning block; 41, placement groove; 5, positioning clamp; 5a, half clamp 1; 5b, half clamp 2; 5b1, adjustment slide; 51, positioning groove; 52, locking screw; 6, fixed axis; 7, bending scale plate; 7a, inclined plane 2; 71, upper half scale plate; 72, lower half scale plate; 73, positioning ring groove; 74, slider; 8, connecting rod; 9 , bending block; 9a, inclined plane 1; 91, limiting part; 10, clamping jaw; 11, scale sleeve; 111, installation hole; 112, positioning screw; 12, scale; 13, length positioning block; 14, locking screw; 15, horizontal handle; 16, longitudinal handle; 17, auxiliary handle; 18, auxiliary positioning block; 181, positioning auxiliary groove; 19, roller; 20, ground locking rod; 21, locking block; a, steel pipe. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0026] Specifically, if Figure 1 As shown, the multi-angle pipe forming machine of this mold includes a workbench 1, a frame 2 fixed below the workbench 1, and an elongated base 3 fixed to the workbench 1. The frame 2 is provided with rollers 19 around its bottom. A ground locking rod 20 is also provided at its bottom. One end of the ground locking rod 20 is threadedly connected to the frame 2, and the other end of the ground locking rod 20 extends toward the ground and is fixedly connected to a locking block 21.

[0027] like Figure 2 As shown, the front end of the base 3 is fixedly connected to a primary positioning block 4 having a placement groove 41, and the rear end of the base 3 is fixedly connected to a positioning clamping block 5 having a positioning groove 51. In this embodiment, the groove wall on one side of the rear end of the positioning groove 51 has a circular arc chamfer, and the groove wall on the other side of the front end of the positioning groove 51 also has a circular arc chamfer. A plurality of auxiliary positioning blocks 18 are also arranged in sequence on the base 3 between the primary positioning block 4 and the positioning clamping block 5. The auxiliary positioning blocks 18 are provided with auxiliary positioning grooves 181. A vertically arranged fixed shaft 6 is fixed to the workbench 1 near the rear end of the base 3. A bending dial 7 with a scale and a connecting rod 8 are respectively sleeved on the fixed shaft 6. In this embodiment, the scale range of the scale on the bending dial 7 is 0 to 180 degrees. The free end of the connecting rod 8 is hinged with a block-shaped bending block 9. A clamping opening 10 for bending the steel pipe a is formed between the bending block 9 and the bending scale 7. In addition, the bending block 9 has a first inclined surface 9a on the side close to the positioning clamping block 5. The bending scale 7 is fan-shaped and has a second inclined surface 7a on the side close to the positioning clamping block 5. An eight-shaped notch is formed between the first inclined surface 9a and the second inclined surface 7a and is connected to the clamping opening 10. At the same time, the bending block 9 also has a zero scale mark and can revolve around the axis of the bending scale 7. Combined with Figure 3 As shown, the bending block 9 also has a stopper 91. When the zero mark on the bending block 9 is aligned with the zero mark on the scale of the bending dial 7, the stopper 91 abuts against the outer surface of the connecting rod 8. In addition, the bending block 9 is fixed with a horizontal handle 15 parallel to the base 3 and a vertical handle 16 perpendicular to the base 3; an auxiliary handle 17 perpendicular to the base 3 is fixed near the rear end of the base 3.

[0028] For example Figure 2As shown, the initial positioning block 4 is rotatably connected to a cylindrical scale sleeve 11 with a scale scale on its outer circumference. In this embodiment, a fixed sleeve is fixed to the initial positioning block 4, and the scale sleeve 11 is mounted on the fixed sleeve and rotatably connected to the fixed sleeve via a bearing. The scale scale on the scale sleeve 11 has a scale range of 0 to 360 degrees. The axis of the scale sleeve 11 is arranged horizontally and perpendicular to the axis of the bending scale plate 7. The scale sleeve 11 has a mounting hole 111 in communication with the mounting groove 41. The outer circumference of the scale sleeve 11 is also provided with a plurality of positioning screws 112 that can be inserted into the mounting holes 111. The base 3 also has a scale 12 arranged along its length. The base 3 also has a length positioning block 13 slidably connected to the base 3, which can slide along its length. The length positioning block 13 is provided with a locking screw 14 for locking the length positioning block 13 to the steel pipe a. The base 3 is provided with a slide groove arranged along the length direction of the base 3, and the length positioning block 13 has a sliding portion that slides in cooperation with the slide groove. The length positioning block 13 has a through hole in it, and the locking screw 14 can extend into the through hole.

[0029] More specifically, if Figure 4 As shown, in this embodiment, the positioning clamp 5 includes a half clamp 5a fixed on the base 3 and a half clamp 2 5b slidably connected to the base 3 along the width direction of the base 3, a positioning groove 51 is formed between the half clamp 1 5a and the half clamp 2 5b, and an inclined adjustment slide 5b1 is provided on the outer side of the half clamp 2 5b, and a locking screw 52 is provided on the half clamp 2 5b, which can lock the half clamp 2 5b on the base 3, and the bending dial 7 includes an upper half dial 71 and a lower half dial 72 which are sleeved on the fixed shaft 6, and a positioning ring groove 73 is provided between the upper half dial 71 and the lower half dial 72 for adapting to the diameter size of the steel pipe a, the upper half dial 71 is fixed to the fixed shaft 6, and the lower half dial 72 is slidably matched with the fixed shaft 6, and a slider 74 is fixed on the lower half dial 72, and the slider 74 is slidably connected in the adjustment slide 5b1.

[0030] Taking the bending object as an example, which is a steel pipe with two 90-degree bending sections and the planes where the two bending sections are located are perpendicular, the operation process of using this machine for bending is as follows: First, first, the straight steel pipe a is passed through the scale sleeve 11, the placement groove 41 of the initial positioning block 4, the positioning auxiliary groove 181 of the auxiliary positioning block 18, and the positioning groove 51 of the positioning clamping block 5 in sequence until it is inserted into the clamping mouth 10; Second, by screwing the locking screw 14, the length positioning block 13 is locked with the locking screw 14 of the steel pipe a, and then according to the required length of the bending section, the length positioning block 13 is slid according to the scale 12 to complete the adjustment of the length of the bending section; Third In the first step, bend the bending block 9 and, referring to the scale on the bending dial 7, make the bending block 9 revolve 90 degrees around the bending dial 7 to complete the first bend. In the fourth step, loosen the locking screw 14 and repeat the second step to adjust the length of the second bend. In the fifth step, tighten the positioning screw 112 to lock the scale sleeve 11 with the steel pipe a. Then, based on the 90-degree angle between the first and second bending sections, rotate the steel pipe a 90 degrees according to the scale on the scale sleeve 11 to accurately adjust the posture of the steel pipe a. In the sixth step, repeat the third step to complete the second bend. This machine achieves precise bending of the steel pipe a for the mold at different planes and angles. Of course, precise bending of multiple angles on the same plane is also possible.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0032] Although this article uses terms such as workbench 1, frame 2, base 3, initial positioning block 4, placement groove 41, positioning clamp 5, half clamp 1 5a, half clamp 2 5b, adjustment slide 5b1, positioning groove 51, locking screw 52, ​​fixed shaft 6, bending dial 7, inclined plane 2 7a, upper half dial 71, lower half dial 72, positioning ring groove 73, slider 74, connecting rod 8, bending block 9, inclined plane 1 9a, limiting part 91, clamping mouth 10, scale sleeve 11, placement hole 111, positioning screw 112, scale 12, length positioning block 13, locking screw 14, horizontal handle 15, longitudinal handle 16, auxiliary handle 17, auxiliary positioning block 18, positioning auxiliary groove 181, roller 19, ground locking rod 20, locking block 21, steel pipe a more frequently, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitation construed in them would be contrary to the spirit of the present invention.

Claims

1. A multi-angle pipe forming machine for a mold, comprising a workbench (1) and a long strip-shaped base (3) fixed on the workbench (1), characterized in that: The front end of the base (3) is fixedly connected to an initial positioning block (4) having a placement groove (41), and the rear end of the base (3) is fixedly connected to a positioning clamping block (5) having a positioning groove (51). A vertically arranged fixed shaft (6) is fixed on the workbench (1) near the rear end of the base (3). The fixed shaft (6) is respectively provided with a bending dial (7) having a scale and a connecting rod (8) connected in rotation. The free end of the connecting rod (8) is hinged to a bending block (9). A useful joint is formed between the bending block (9) and the bending dial (7). The clamping mouth (10) of the steel pipe (a) is bent, the bending block (9) has a zero scale mark and can revolve around the axis of the bending scale plate (7), the initial positioning block (4) is rotatably connected to a cylindrical scale sleeve (11) with a scale meter on the outer periphery, the axis of the scale sleeve (11) is arranged in the horizontal direction and is perpendicular to the axis of the bending scale plate (7), the scale sleeve (11) has a placement hole (111) in communication with the placement groove (41), and the outer periphery of the scale sleeve (11) is also provided with a plurality of holes (111) that can be inserted into the placement holes (111). 1) in the positioning screw (112); the positioning clamp (5) includes a half clamp (5a) fixed on the base (3) and a half clamp (5b) slidably connected to the base (3) along the width direction of the base (3), the positioning groove (51) is formed between the half clamp (5a) and the half clamp (5b), the outer side of the half clamp (5b) is provided with an inclined adjustment slide (5b1), and the half clamp (5b) is provided with a locking screw (52) capable of locking the half clamp (5b) on the base (3). The bending scale plate (7) comprises an upper scale plate (71) and a lower scale plate (72) sleeved on the fixed shaft (6); a positioning ring groove (73) adapted to the diameter of the steel pipe (a) is provided between the upper scale plate (71) and the lower scale plate (72); the upper scale plate (71) is fixedly connected to the fixed shaft (6); the lower scale plate (72) is slidably engaged with the fixed shaft (6); a slider (74) is fixed to the lower scale plate (72); and the slider (74) is slidably connected to the adjusting slideway (5b1).

2. The multi-angle pipe forming machine of the mold according to claim 1, characterized in that: The base (3) has a scale (12) arranged along the length direction of the base (3), and the base (3) is also slidably connected to a length positioning block (13) capable of sliding along the length direction of the base (3). The length positioning block (13) is provided with a locking screw (14) for locking the length positioning block (13) and the steel pipe (a).

3. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: The bending block (9) is block-shaped and has a first inclined surface (9a) on the side close to the positioning clamp (5); the bending scale plate (7) is fan-shaped and has a second inclined surface (7a) on the side close to the positioning clamp (5); and an eight-shaped recess is formed between the first inclined surface (9a) and the second inclined surface (7a) and communicates with the clamp (10).

4. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: The bending block (9) has a limiting portion (91), and when the zero scale mark on the bending block (9) is aligned with the zero scale of the scale on the bending scale plate (7), the limiting portion (91) abuts against the outer surface of the connecting rod (8).

5. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: A transverse handle (15) parallel to the base (3) and a longitudinal handle (16) perpendicular to the base (3) are fixed to the bending block (9); an auxiliary handle (17) perpendicular to the base (3) is fixed to a position near the rear end of the base (3).

6. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: A plurality of auxiliary positioning blocks (18) are sequentially arranged at intervals on the base (3) between the initial positioning block (4) and the positioning clamping block (5), and auxiliary positioning grooves (51) are provided on the auxiliary positioning blocks (18).

7. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: A groove wall on one side of the rear end of the positioning groove (51) has an arc chamfer, and a groove wall on the other side of the front end of the positioning groove (51) also has an arc chamfer.

8. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: A fixed sleeve is fixed on the initial positioning block (4), and the scale sleeve (11) is sleeved on the fixed sleeve and the two are rotatably connected via a bearing.

9. The multi-angle pipe forming machine according to claim 1 or 2, characterized in that: The multi-angle pipe forming machine further comprises a frame (2) fixed under the workbench (1), rollers (19) are provided around the bottom of the frame (2), and a ground locking rod (20) is further provided at the bottom of the frame (2), one end of the ground locking rod (20) is threadedly connected to the frame (2), and the other end of the ground locking rod (20) extends toward the ground and is fixedly connected to a locking block (21).

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