A hand pipe bender

Abstract

This utility model relates to the field of pipe bending machine technology, specifically a manual pipe bending machine, including a fixed upright plate. A hydraulic cylinder is fixed to one side of the fixed upright plate, and a guide rail extending in the same direction as the cylinder's stroke is fixed to the opposite side. A vertically oriented pin is fixed to the free end of the guide rail, and molds of different specifications are inserted into the pin. A slider is slidably fitted to the guide rail, and the slider is fixed to the piston rod of the hydraulic cylinder and a movable frame. An even number of pressure blocks are mounted on the movable frame. The pressure blocks move towards one side of the mold to shape the pipe. Unlike existing technologies, a fixed plate is fixed to the fixed upright plate, and a manual hydraulic pump is fixed to the fixed plate. The inlet and outlet pipes of the manual hydraulic pump are connected to the hydraulic cylinder to drive the cylinder's action, realizing the manual shaping operation of the pipe by the pressure blocks. Compared with existing technologies, this utility model eliminates dependence on electricity, is suitable for field scenarios, improves the durability of the molds and pressure blocks, and reduces maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of pipe bending machine technology, specifically a manual pipe bending machine. Background Technology

[0002] During pipeline installation, bending operations are often required to meet various installation and usage needs. Currently, most pipe bending machines on the market are electrically driven. While these machines can efficiently complete pipe bending operations in environments with a stable power supply, they cannot be used in areas without power, such as remote mountainous areas or field construction sites. Even when equipped with a generator to provide power, transporting the generator is cumbersome, especially in complex terrain environments, increasing labor and material costs.

[0003] Furthermore, the die is a critical component when a pipe bending machine bends pipes. Currently, most dies used in pipe bending machines are made of high-strength plastic. During long-term use, due to repeated compression and friction from the pipes, the die, especially the central inner hole, is prone to deformation. Die deformation directly affects the accuracy and quality of the pipe bend, necessitating regular die replacement. This not only increases equipment maintenance costs but also reduces production efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a manual pipe bending machine to solve the problems mentioned in the background art, namely, to provide a manual pipe bending machine that does not require electric drive, can be used normally in the field without power supply, has a simple structure, small size, is easy to operate and carry, and can improve the problem of easy mold deformation, thus meeting the pipe bending needs in the field and various scenarios. To this end, this utility model adopts the following technical solution: A manual pipe bending machine includes a fixed upright plate. A hydraulic cylinder is fixed on one side of the fixed upright plate, and a guide rail extending in the same direction as the stroke of the hydraulic cylinder is fixed on the opposite side. A vertically oriented pin is fixed at the free end of the guide rail, and molds of different specifications are inserted into the pin. A slider is slidably fitted to the guide rail. The slider is fixed to the piston rod of the hydraulic cylinder and a movable frame. An even number of pressure blocks are installed on the movable frame. The pressure blocks move towards one side of the mold to shape the pipe. Unlike the prior art, a fixed plate is fixed to the fixed upright plate, and a manual hydraulic pump is fixed on the fixed plate. The inlet and outlet oil pipes of the manual hydraulic pump are connected to the hydraulic cylinder to drive the hydraulic cylinder to operate, thereby realizing the manual shaping operation of the pipe by the pressure blocks.

[0005] Furthermore, guide holes with the same axial direction as the cylinder stroke are respectively provided on the fixed upright plates on both sides of the cylinder. A guide rod is slidably fitted in the guide hole, and one end of the guide rod is fixedly connected to the slider.

[0006] Furthermore, a wear-resistant sheet is fixedly installed on the guide rail, and the wear-resistant sheet slides in conjunction with the slider; the wear-resistant sheet is a polytetrafluoroethylene sheet, an oil-impregnated bronze sheet, an ultra-high molecular weight polyethylene sheet, or an iron sheet with a molybdenum disulfide coating.

[0007] Furthermore, the mold is in the shape of a semi-circular frustum, and an arc-shaped groove with a cross-section adapted to the diameter of the pipe fitting is opened on the circular surface of the mold. The arc-shaped groove is used to fit and limit the pipe fitting. A first mark is provided on the upper end face of the mold. The first mark is used to indicate the pipe fitting diameter and bending radius adapted to the mold.

[0008] Furthermore, a stop is fixedly provided on the free end face of the guide rail, and the inner end face of the stop abuts against the straight side of the mold to restrict the mold from rotating around the pin; the straight side is the side formed by the plane of the semicircular chord in the semicircular frustum mold.

[0009] Furthermore, the body of the mold is made of high-strength plastic, and the center of the mold has an insertion hole adapted to the pin. A first steel central bushing is fixedly installed in the insertion hole; the outer wall of the first steel central bushing is tightly fitted with the inner wall of the insertion hole of the mold.

[0010] Furthermore, the body of the pressure block is made of high-strength plastic, and the pressure block has a plug hole adapted to the pin. A second steel central bushing is fixedly installed in the plug hole; the outer wall of the second steel central bushing is tightly fitted with the inner wall of the plug hole of the pressure block.

[0011] Furthermore, the two opposite sides of the pressure block are respectively provided with V-grooves or round-bottomed V-grooves adapted to different pipe diameters. The V-grooves and round-bottomed V-grooves are used to adapt to pipes of different diameters and to extrude and shape them. The upper end face of the pressure block is provided with a second mark, which is used to indicate the range of pipe diameters that the pressure block is adapted to.

[0012] Furthermore, a boss is provided in the middle of the pin. The upper surface of the boss abuts against the lower surface of the mold to support the mold, and the lower surface of the boss abuts against the upper surface of the guide rail to achieve axial positioning. The upper section above the boss is inserted into the pin hole opened on the mold, and the lower section below the boss is inserted into the fixing hole opened on the guide rail.

[0013] Furthermore, the movable frame includes an upper plate and a lower plate. The upper plate and the lower plate have multiple sets of insertion holes at the end facing the mold. The multiple sets of insertion holes are mirror-symmetrical about the central axis of the guide rail. The pressure block has insertion holes that are adapted to the insertion holes. The pins are inserted into the insertion holes of the upper plate, the insertion holes of the pressure block, and the insertion holes of the lower plate in sequence from top to bottom. The pin head is blocked by the edge of the insertion hole of the upper plate to achieve axial positioning, thereby fixing the pressure block on the movable frame.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are: Eliminating dependence on electricity and adapting to field scenarios: The hydraulic cylinder is driven by a manual hydraulic pump, eliminating the need for an electric power supply. This completely solves the problem of traditional electric pipe bending machines being unusable in environments without electricity. It also avoids the increased manpower and material costs and inconvenience of carrying a generator, greatly expanding the applicable scenarios of the equipment. It is especially suitable for pipe bending operations in remote mountainous areas and field construction where there is no electricity or the power supply is unstable.

[0015] Improve the durability of molds and pressure blocks and reduce maintenance costs: The mold and pressure block body is made of high-strength plastic, which balances lightweight and basic strength. At the same time, a steel central bushing is added in its insertion hole, which can effectively enhance the wear resistance of the insertion hole, reduce the deformation caused by repeated insertion and compression of the pin / prong, significantly extend the service life of the mold and pressure block, reduce the maintenance costs caused by frequent replacement of parts, and ensure the stability of pipe bending accuracy and pipe molding quality during long-term use.

[0016] Enhanced operational stability and equipment durability: The guide rods on both sides of the cylinder are fixed to the slider, which can effectively limit the deviation of the slider during the sliding process, improve the stability of the slider moving along the guide rail, and ensure that the plasticizing force of the pressure block on the pipe is uniform; the wear-resistant plates on the guide rail can reduce the direct friction loss between the slider and the guide rail, further extending the overall service life of the equipment and reducing the need for daily wear and maintenance.

[0017] High versatility and convenient operation: The pin achieves detachable connection of the mold through the boss structure. With the first mark on the mold, different specifications of molds can be quickly replaced to adapt to pipe fittings with different pipe diameters and bending radii. The V-groove and round bottom V-groove design of the pressure block and the second mark can directly adapt to various pipe fittings and quickly select the type without the need to replace the entire pressure block assembly. This greatly improves the equipment's adaptability to different pipe fitting processing needs and makes operation more efficient.

[0018] Compact structure and excellent portability: The overall structure is simple, with no complex electric drive components. It is small in size and has a controllable weight, making it easy to transport and place in complex terrain in the field. This further adapts to the mobile needs of field operations and enhances the practical value and operational flexibility of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the pin of this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the mold of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the pressure block of this utility model. Detailed Implementation

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the paper. This orientation or positional relationship is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figure 1-4 The manual pipe bending machine shown includes a fixed upright plate 1. A hydraulic cylinder 2 is fixed on one side of the fixed upright plate 1, and a guide rail 3 with the same extension direction as the hydraulic cylinder stroke is fixed on the opposite side. A vertically oriented pin 4 is fixed at the free end of the guide rail 3, and molds 5 of different specifications are inserted into the pin 4. A slider 6 is slidably fitted to the guide rail 3. The slider 6 is fixed to the piston rod of the hydraulic cylinder 2 and a movable frame 7. An even number of pressure blocks 8 are installed on the movable frame 7. The pressure blocks 8 move towards the mold 5 to shape the pipe. A fixed plate 9 is fixed to the fixed upright plate 1. A manual hydraulic pump 10 is fixed to the fixed plate 9. The inlet and outlet oil pipes of the manual hydraulic pump 10 are connected to the hydraulic cylinder 2 to drive the hydraulic cylinder to move, so as to realize the manual shaping operation of the pressure blocks 8 on the pipe.

[0027] The mold 5 is generally shaped like a semi-circular frustum. An arc-shaped groove 51 with a cross-section adapted to the diameter of the pipe fitting is formed on the circular surface of the mold 5. The arc-shaped groove 51 is used to fit and limit the pipe fitting. A first mark 53 is provided on the upper end face of the mold 5, indicating the pipe fitting diameter and bending radius to which the mold 5 is adapted. A stop 13 is fixedly provided on the free end face of the guide rail 3. The inner end face of the stop 13 abuts against the straight side surface of the mold 5 to restrict the rotation of the mold 5 around the pin 4. The straight side surface is the side surface formed by the plane containing the semi-circular chord in the semi-circular frustum mold. The body of the mold 5 is made of high-strength plastic. The center of the mold 5 has an insertion hole that matches the pin 4. A first steel central bushing 52 is fixedly installed in the insertion hole. The outer wall of the first steel central bushing 52 is tightly fitted with the inner wall of the insertion hole of the mold 5 to enhance the wear resistance of the insertion hole, prevent the mold from being deformed by repeated insertion and compression of the pin, and extend the service life of the mold 5.

[0028] The body of the pressure block 8 is made of high-strength plastic. The pressure block 8 has a insertion hole that matches the pin 14. A second steel central bushing 84 is fixedly installed in the insertion hole. The outer wall of the second steel central bushing 84 is tightly fitted with the inner wall of the insertion hole of the pressure block 8 to enhance the structural strength of the insertion hole of the pressure block, prevent the pressure block from deforming due to long-term squeezing of the pin, and ensure the stable fit between the pressure block 8 and the pin 14.

[0029] The technical principle of this embodiment is as follows: Using manual hydraulic drive as the core power source, precise bending and shaping of pipe fittings is achieved through the orderly linkage of mechanical structures. Simultaneously, a reinforced structure ensures the durability and operational stability of the equipment. The specific process and principle are as follows: Power Input and Transmission Principle: The operator manually operates the manual hydraulic pump 10 on the fixed plate 9, supplying hydraulic oil to the cylinder 2 by pressing the hydraulic pump handle or controlling the hydraulic oil return by reversing the operation; the hydraulic oil creates a pressure difference in the cylinder 2, driving the piston rod of the cylinder 2 to extend and retract axially—the extension and retraction direction of the piston rod is consistent with the extension direction of the guide rail 3, thereby driving the slider 6, which is fixed to the piston rod, to slide linearly along the guide rail 3. During this process, the guide rods 11 on both sides of the cylinder 2 slide synchronously with the slider 6. Through the limiting effect of the guide rods 11 in the guide holes of the fixed plate 1, the slider 6 is prevented from deviating or wobbling during sliding, ensuring the linear stability of power transmission.

[0030] Pipe molding principle: When the slider 6 slides, it synchronously drives the movable frame 7 fixed to it to move. The even number of pressure blocks 8 on the movable frame 7 move closer to the mold 5. At this time, the pipe to be bent must first be placed in the arc groove 51 on the circular surface of the mold 5. The cross section of the arc groove 51 is adapted to the pipe diameter, which can play a radial limiting role for the pipe and prevent the pipe from shifting during the bending process. As the pressure blocks 8 continue to move closer, the V-shaped groove 81 or the round bottom V-shaped groove 82 on the side of the pressure block 8 fits against the outer circumference of the pipe and applies a uniform extrusion force to the pipe. Under the extrusion force of the pressure blocks 8 and the limiting effect of the arc groove 51 of the mold 5, the pipe gradually fits the arc contour of the mold 5 and bends, eventually forming a bent shape with the same bending radius as the mold 5, thus completing the molding operation.

[0031] Structural reinforcement and durability principle: The mold 5 body is made of high-strength plastic, but the first steel central bushing 52 in its central insertion hole is in direct contact with the pin 4. The high wear resistance of the steel bushing reduces the wear on the plastic mold caused by repeated insertion and compression of the pin 4, avoids deformation of the mold insertion hole, and extends the service life of the mold 5. Similarly, the second steel central bushing 84 in the insertion hole of the pressure block 8 cooperates with the pin 14 to prevent the hole wall of the pressure block 8 from deforming due to long-term compression by the pin 14, ensuring the stability of the connection between the pressure block 8 and the movable frame 7. At the same time, the wear-resistant plate 12 on the guide rail 3 is in direct contact with the slider 6. Through the low friction characteristics of the wear-resistant plate 12, such as polytetrafluoroethylene plate or oil-impregnated bronze plate, the direct wear between the slider 6 and the guide rail 3 is reduced, further improving the overall durability of the equipment.

[0032] Mold adaptation and replacement principle: Mold 5 is inserted into pin 4 through the central insertion hole. The boss 41 in the middle of pin 4 can provide axial support for mold 5. The upper end face of boss 41 supports mold 5, and the lower end face abuts against guide rail 3 for limitation. At the same time, the stop 13 on the free end face of guide rail 3 abuts against the straight side of mold 5 to prevent mold 5 from rotating around pin 4. When it is necessary to process pipe fittings with different diameters or different bending radii, simply pull out the old mold 5 and replace it with a new mold 5 with the corresponding arc groove 51. The first mark 53 on the upper end face of mold 5 can quickly indicate the pipe diameter and bending radius of the fitting it is compatible with, improving replacement efficiency. The replacement of pressure block 8 is the same. Pressure block 8 with different grooves can be replaced by inserting and pulling pin 14 to adapt to different processing requirements.

[0033] In another preferred embodiment, guide holes with axial direction consistent with the stroke of the cylinder are respectively provided on the fixed upright plates 1 on both sides of the cylinder 2. Guide rods 11 are slidably fitted in the guide holes, and one end of the guide rods 11 is fixedly connected to the slider 6. By providing guide rods fixedly connected to the slider on both sides of the cylinder, the guide rods slide along the guide holes of the fixed upright plates, which can effectively limit the radial offset or wobbling of the slider when sliding along the guide rail, ensuring the linearity and stability of the slider movement. This structure makes the movement of the movable frame and the pressure block smoother, and the pressure of the pressure block on the pipe is more evenly distributed, avoiding pipe bending deformation or precision deviation caused by slider offset, and significantly improving the consistency of pipe bending quality.

[0034] In another preferred embodiment, a wear-resistant plate 12 is fixedly disposed on the guide rail 3, and the wear-resistant plate 12 slides in engagement with the slider 6; the wear-resistant plate 12 is a polytetrafluoroethylene sheet, an oil-impregnated bronze sheet, an ultra-high molecular weight polyethylene sheet, or an iron sheet with a molybdenum disulfide coating. The wear-resistant plate (such as a polytetrafluoroethylene sheet, an oil-impregnated bronze sheet, etc.) fixed on the guide rail directly contacts the slider, replacing the direct metal-to-metal friction (or plastic-to-metal friction) between the slider and the guide rail. The low coefficient of friction of the wear-resistant plate can reduce sliding resistance, making manual operation less strenuous; at the same time, its high wear resistance can reduce long-term wear and tear on the slider and the guide rail, extend the service life of both, reduce equipment maintenance frequency and cost, and is especially suitable for frequent field operation scenarios.

[0035] In another preferred embodiment, the pressure block 8 has V-grooves 81 or round-bottomed V-grooves 82 on its two opposite sides, which are adapted to different pipe diameters. The V-grooves 81 and round-bottomed V-grooves 82 are used to adapt to pipes of different diameters and to extrude and shape them. A second mark 83 is provided on the upper surface of the pressure block 8, indicating the range of pipe diameters to which the pressure block is adapted. The V-grooves and round-bottomed V-grooves on both sides of the pressure block can adapt to pipes of different diameters, eliminating the need to design a separate pressure block for each pipe diameter and significantly improving the versatility of the pressure block. The second mark on the upper surface visually indicates the range of pipe diameters to which the pressure block is adapted, allowing operators to quickly match pipe specifications, reducing selection time and improving changeover efficiency. Furthermore, the close fit between the groove and the outer circumference of the pipe ensures uniform force during extrusion, preventing surface damage or bending deformation of the pipe.

[0036] In another preferred embodiment, a boss 41 is provided in the middle of the pin 4. The upper end face of the boss 41 abuts against the lower surface of the mold 5 to support the mold 5, and the lower end face of the boss 41 abuts against the upper surface of the guide rail 3 to achieve axial limiting. The upper section 42 of the boss 41 is inserted into the pin hole on the mold 5, and the lower section 43 of the boss 41 is inserted into the fixing hole on the guide rail 3 to achieve a detachable connection between the mold 5 and the guide rail 3. The boss in the middle of the pin abuts against the lower surface of the mold and the upper surface of the guide rail through its upper and lower end faces, respectively, which not only achieves axial support and limiting of the mold (preventing axial movement or detachment of the mold), but also ensures that the mold is firmly installed through the insertion fit of the upper and lower sections of the boss (the upper section with the pin hole of the mold, and the lower section with the fixing hole of the guide rail). At the same time, the detachable insertion structure makes the mold replacement operation convenient, and can meet the bending requirements of various pipe fittings by using different specifications of molds, thereby improving the applicability of the equipment.

[0037] In another preferred embodiment, the movable frame 7 includes an upper plate 71 and a lower plate 72. Multiple sets of insertion holes 73 are provided at the ends of the upper plate 71 and lower plate 72 facing the mold 5. These insertion holes 73 are mirror-symmetrical about the central axis of the guide rail 3. The pressure block 8 has insertion holes adapted to the insertion holes 73. Pins 14 are inserted sequentially from top to bottom into the insertion holes 73 of the upper plate 71, the insertion holes of the pressure block 8, and the insertion holes 73 of the lower plate 72. The pin head of the pin 14 is blocked by the edge of the insertion hole 73 of the upper plate 71 to achieve axial positioning, thereby fixing the pressure block 8 to the movable frame 7. The upper and lower plates of the movable frame are secured by pins passing through the insertion holes and the insertion holes of the pressure block, ensuring a stable fixation of the pressure block and preventing it from loosening when pressing the pipe. The multiple sets of insertion holes are mirror-symmetrical about the central axis of the guide rail, ensuring balanced force on the pressure block after installation and preventing bending or displacement of the pipe due to uneven force on one side. In addition, the plug-in connection of the pin makes it easy to replace the pressure block, and the multi-specification groove design of the pressure block further enhances the equipment's ability to quickly respond to different pipe fitting processing needs.

[0038] The various preferred embodiments work together to achieve the comprehensive advantages of the manual pipe bending machine: stable operation, high durability, high versatility, and convenient model changeover. This makes it more suitable for the actual needs of outdoor environments without electricity and diverse pipe fitting processing scenarios. The above description is only a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A manual pipe bending machine, comprising a fixed upright plate (1), wherein a hydraulic cylinder (2) is fixed on one side of the fixed upright plate (1), and a guide rail (3) with the extension direction consistent with the stroke of the hydraulic cylinder is fixed on the opposite side; an axially vertical pin (4) is fixed at the free end of the guide rail (3), and molds (5) of different specifications are inserted into the pin (4); the guide rail (3) is slidably fitted with a slider (6), the slider (6) is fixedly connected to the piston rod of the hydraulic cylinder (2) and a movable frame (7), an even number of pressure blocks (8) are installed on the movable frame (7), and the pressure blocks (8) move toward the mold (5) to shape the pipe; characterized in that, A fixed plate (9) is fixedly connected to the fixed plate (1), and a manual hydraulic pump (10) is fixedly installed on the fixed plate (9). The inlet and outlet oil pipes of the manual hydraulic pump (10) are connected to the oil cylinder (2) to drive the oil cylinder to move, so as to realize the manual shaping operation of the pressure block (8) on the pipe.

2. The manual pipe bending machine according to claim 1, characterized in that, The fixed upright plates (1) on both sides of the oil cylinder (2) are respectively provided with guide holes whose axial direction is consistent with the oil cylinder stroke. A guide rod (11) is slidably fitted in the guide hole, and one end of the guide rod (11) is fixedly connected to the slider (6).

3. The manual pipe bending machine according to claim 1, characterized in that, A wear-resistant sheet (12) is fixedly installed on the guide rail (3), and the wear-resistant sheet (12) slides in cooperation with the slider (6); the wear-resistant sheet (12) is a polytetrafluoroethylene sheet, an oil-impregnated bronze sheet, an ultra-high molecular weight polyethylene sheet, or an iron sheet with a molybdenum disulfide coating.

4. The manual pipe bending machine according to claim 1, characterized in that, The mold (5) is in the shape of a semi-circular frustum. An arc groove (51) with a cross section that matches the pipe diameter is opened on the circular surface of the mold (5). The arc groove (51) is used to fit and limit the pipe. A first mark (53) is provided on the upper end face of the mold (5). The first mark (53) is used to indicate the pipe diameter and bending radius that the mold (5) is compatible with.

5. The manual pipe bending machine according to claim 4, characterized in that, A stop (13) is fixedly provided on the free end face of the guide rail (3). The inner end face of the stop (13) abuts against the straight side of the mold (5) to restrict the mold (5) from rotating around the pin (4). The straight side is the side formed by the plane of the semicircular chord in the semicircular mold.

6. The manual pipe bending machine according to claim 4, characterized in that, The body of the mold (5) is made of high-strength plastic. The center of the mold (5) is provided with an insertion hole that is compatible with the pin (4). A first steel central bushing (52) is fixedly installed in the insertion hole. The outer wall of the first steel central bushing (52) is tightly fitted with the inner wall of the insertion hole of the mold (5).

7. The manual pipe bending machine according to claim 1, characterized in that, The body of the pressure block (8) is made of high-strength plastic. The pressure block (8) has a plug hole that is compatible with the pin (14). A second steel central bushing (84) is fixedly installed in the plug hole. The outer wall of the second steel central bushing (84) is tightly fitted with the inner wall of the plug hole of the pressure block (8).

8. The manual pipe bending machine according to claim 1, characterized in that, The pressure block (8) has V-grooves (81) or round-bottomed V-grooves (82) on its two opposite sides, which are adapted to different pipe diameters. The V-grooves (81) and round-bottomed V-grooves (82) are used to adapt to pipes of different diameters and to extrude and shape them. The upper end face of the pressure block (8) is provided with a second mark (83), which is used to indicate the range of pipe diameters that the pressure block is adapted to.

9. The manual pipe bending machine according to claim 1, characterized in that, The pin (4) is provided with a boss (41) in the middle. The upper end face of the boss (41) abuts against the lower surface of the mold (5) to support the mold (5). The lower end face of the boss (41) abuts against the upper surface of the guide rail (3) to achieve axial positioning. The upper section (42) above the boss (41) is inserted into the pin hole opened on the mold (5). The lower section (43) below the boss (41) is inserted into the fixing hole opened on the guide rail (3).

10. The manual pipe bending machine according to claim 1, characterized in that, The movable frame (7) includes an upper plate (71) and a lower plate (72). The upper plate (71) and the lower plate (72) have multiple sets of insertion holes (73) at the end facing the mold (5). The multiple sets of insertion holes (73) are mirror-symmetrical about the central axis of the guide rail (3). The pressure block (8) has insertion holes that are compatible with the insertion holes (73). The pin (14) is inserted into the insertion holes (73) of the upper plate (71), the insertion holes of the pressure block (8), and the insertion holes (73) of the lower plate (72) from top to bottom. The head of the pin (14) is blocked by the edge of the insertion hole (73) of the upper plate (71) to achieve axial positioning, thereby fixing the pressure block (8) on the movable frame (7).

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