Miniature handheld pipe bending device

Abstract

The utility model discloses a miniature handheld pipe bending device. The miniature handheld pipe bending device comprises a groove-shaped track, a nut seat arranged at one end of the groove-shaped track, two idler wheels rotationally connected to the other end of the groove-shaped track and a sliding block connected into the groove-shaped track in a sliding mode. Two arc-shaped pressing plates are arranged on the sliding block; the nut seat is in threaded connection with a screw rod; one end of the lead screw is rotatably connected with the sliding block, and the other end of the lead screw is slidably connected with an operating rod in the radial direction of the lead screw. The pipe is driven to be bent in a pushing or pulling mode, the flexibility and maneuverability are high, and the pipe bending machine can adapt to any complex working condition and operation in narrow and small space. The pipe is bent by rotating the screw rod, so that precise control is facilitated, and the pipe bending precision is favorably improved; the lead screw can achieve self-locking, and the bend can prevent the bent pipe from rebounding to a certain degree. On the premise that the occupied space is reduced as much as possible, the structural strength and rigidity of a stressed part are enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of metal tube and rod processing, and in particular relates to a miniature handheld tube bending device. Background Technology

[0002] Currently, wound-tube heat exchangers are widely used in cryogenic equipment in the chemical industry, such as methanol washing systems for synthetic ammonia and subcoolers and liquefaction units in air separation equipment. Their design structure is complex, with numerous heat exchange tubes that are intertwined and interwoven, and densely packed bends at the junction of the medium inlet and outlet. The design utilizes the curvature of stainless steel bends to increase the flexible connection between the heat exchange tubes and the junction, and to adjust and precisely position the spacing of the heat exchange tubes. Simultaneously, it effectively compensates for thermal expansion and contraction during heat exchange. Because stainless steel tubing has high tensile strength and impact toughness, it is difficult for it to undergo plastic deformation when wound or bent. In actual manufacturing, achieving consistent spacing dimensions for all bent heat exchange tubes is extremely challenging.

[0003] Due to the special structural design of the stainless steel tubes in the coiled tube heat exchanger, it is impossible to pre-bend them in batches in the factory in advance. The pre-processing of the pipes can only be completed according to the design drawings before the stainless steel tubes can be customized and bent on site.

[0004] Chinese patent document CN104646461B discloses a handheld pipe bender capable of flexibly adapting to various diameters of pipes or puncture needles to be bent. This handheld pipe bender includes a housing, a first handle, a first fixing member and a second fixing member, a first roller and a second roller, a second handle, a first positioning device, and a second positioning device. The first roller and the second roller are fixed between the first fixing member and the second fixing member. The distance between the first roller and the second fixing member is adjusted by the length of the first fixing member and the second fixing member. The pipe to be bent passes between the first roller and the second roller. Therefore, by adjusting the length of the first fixing member and the second fixing member, pipes of different diameters can be bent.

[0005] While the aforementioned patent allows for on-site tube bending, its application in the production of wound-tube heat exchangers presents three drawbacks due to the limited space available: 1. Large size, preventing its use in confined spaces; 2. Difficult bending or limited usability, as the second handle acts as a lever; a short handle leads to strenuous operation, while a long handle prevents its use in confined spaces; 3. Poor bending precision, as stainless steel tubes, due to their properties, partially spring back after bending. Maintaining the bent state allows the elastic stress to gradually release, but this process requires manual control, making accurate angle and precision difficult. Alternatively, excessive bending can be used to bring the springback tube to the pre-set angle, but this process also necessitates manual angle control. Utility Model Content

[0006] To overcome the technical problems of existing handheld pipe benders being unsuitable for use in confined spaces, having poor bending accuracy, and being inconvenient for manual operation, this invention aims to provide a miniature handheld pipe bender. By simplifying the structure and reducing the overall size, and by changing the bending drive method, a rotating lead screw pushes or pulls an arc-shaped pressure plate for bending. This results in a smaller footprint and lower operating space requirements, requiring less effort and facilitating manual operation and precise control of the bending angle.

[0007] To achieve the above objectives, the present invention employs the following technical solution: a miniature handheld pipe bending device, comprising a grooved track, a nut seat disposed at one end of the grooved track, two rollers rotatably connected to the other end of the grooved track, and a slider slidably connected within the grooved track; the two rollers are symmetrically disposed on both sides of the grooved track; wherein, two arc-shaped pressure plates are disposed on the slider; a lead screw is threadedly connected to the nut seat; one end of the lead screw is rotatably connected to the slider, and the other end is slidably connected to an operating rod along the radial direction of the lead screw.

[0008] The sliding operating lever extends the torque of the lead screw, making operation more effortless and allowing for flexible adjustments based on actual working conditions, such as limited space or insufficient rotation space.

[0009] Furthermore, the slider is provided with an outwardly extending lug located outside the grooved track; the lead screw is provided with two bearings located on both sides of the outwardly extending lug.

[0010] Specifically, two nuts are provided at the end of the lead screw near the slider; the nuts are located on the side of the bearing away from the operating lever; and there are washers between the nuts and the two bearings.

[0011] Furthermore, a scale plate is provided on the grooved track; an indicator needle is provided on the slider; and the indicator needle is directly opposite the scale plate.

[0012] Specifically, the scale plate is provided with two sets of marks to indicate the bending angle of the tube when it is located on both sides of the roller; the indicator needle is directly opposite the marks.

[0013] Furthermore, each end of the operating lever is provided with a head; the outer diameter of the head is larger than the outer diameter of the operating lever; the head is used to prevent the operating lever from disengaging from the lead screw.

[0014] Furthermore, two support arms are symmetrically arranged on the grooved track near the end of the roller; the roller is rotatably connected to the end of the support arm; the end of the support arm and the end of the grooved track near the nut seat are provided with diagonal braces; the two diagonal braces and the two support arms form a triangular frame.

[0015] Furthermore, the included angle between the two sides of the arc-shaped pressure plate is 70°.

[0016] Multiple computer simulations of multi-angle pipe bending were conducted, demonstrating the loading and unloading of stainless steel pipes of the same specifications. This angle facilitates the loading and unloading of stainless steel pipes during bending.

[0017] Furthermore, a connecting rod is provided at the end of the lead screw away from the arc-shaped pressure plate; the connecting rod is used to insert a power tool.

[0018] Specifically, the roller has a first semicircular groove on its outer periphery; the arc-shaped pressure plate has a second semicircular groove on its outer periphery; the first semicircular groove and the second semicircular groove are located on the same plane.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This utility model has a simple structure, occupies little space and has a small operating space. Depending on the specific working environment, the pipe can be driven to bend by pushing or pulling, which has strong flexibility and mobility and can adapt to any complex working conditions and narrow space operations.

[0021] 2. This utility model uses a rotating screw to drive an arc-shaped pressure plate to slide for bending, making the operation more convenient and labor-saving. The movement position of the arc-shaped pressure plate is easy to control precisely, which helps to improve the bending accuracy. The screw can also achieve self-locking, maintaining the bent state after bending, allowing the stress of the bent pipe to be released gradually, which can prevent the pipe from springing back to a certain extent.

[0022] 3. By setting up diagonal braces and support arms, this utility model optimizes structural features and strengthens the structural strength and rigidity of stress-bearing parts while minimizing the space occupied, so as to ensure smooth completion under full load. Attached Figure Description

[0023] Figure 1 This is the front view of the present invention;

[0024] Figure 2 This is a side view of the present invention;

[0025] Figure 3 This is a bottom view of the present invention;

[0026] Figure 4 For the present utility model Figure 1 A magnified structural diagram of part A in the middle.

[0027] In the diagram: 1. Groove track; 11. Nut seat; 12. Diagonal brace; 13. Support arm; 2. Roller; 3. Slider; 31. Outer ear; 4. Arc-shaped pressure plate; 5. Lead screw; 51. Nut; 52. Washer; 6. Operating lever; 61. End; 7. Bearing. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do 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. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] See Figures 1-4 A miniature handheld pipe bending device includes a grooved track 1, a nut seat 11 disposed at the lower end of the grooved track 1, two rollers 2 rotatably connected to the upper end of the grooved track 1, and a slider 3 slidably connected within the grooved track 1; the two rollers 2 are symmetrically arranged on both sides of the grooved track 1; two support arms 13 are symmetrically arranged on the grooved track 1 near one end of the rollers 2; the rollers 2 are rotatably connected to the ends of the support arms 13; the ends of the support arms 13 and the ends of the grooved track 1 near the nut seat 11 are provided with diagonal braces 12; the two diagonal braces 12 and the two support arms 13 form a triangular frame.

[0033] The slider 3 is provided with two arc-shaped pressure plates 4; the included angle between the two sides of the arc-shaped pressure plates 4 is 70°; a lead screw 5 is threadedly connected to the nut seat 11; one end of the lead screw 5 is rotatably connected to the slider 3, and the other end is slidably connected to an operating rod 6 along the radial direction of the lead screw 5; both ends of the operating rod 6 are respectively provided with end heads 61; the outer diameter of the end head 61 is larger than the outer diameter of the operating rod 6; the end head 61 is used to restrict the operating rod 6 from disengaging from the lead screw 5.

[0034] The slider 3 is provided with an outwardly extending lug 31 located outside the grooved track 1; the lead screw 5 is provided with two bearings 7 located on both sides of the outwardly extending lug 31; the lead screw 5 is provided with two nuts 51 near the end of the slider 3; the nuts 51 are located on the side of the bearings 7 away from the operating lever 6; there is a washer 52 between the nuts 51 and the two bearings 7.

[0035] A scale plate is provided on the grooved track 1; an indicator needle is provided on the slider 3; two sets of marks are provided on the scale plate to indicate the bending angle of the bend when the bend is located on both sides of the roller 2; the indicator needle is directly opposite the marks.

[0036] The roller 2 has a first semi-circular groove on its outer periphery; the arc-shaped pressure plate 4 has a second semi-circular groove on its outer periphery; the first semi-circular groove and the second semi-circular groove are located on the same plane.

[0037] A connecting rod is provided at the end of the lead screw 5 away from the arc-shaped pressure plate 4; the connecting rod is used to insert a power tool.

[0038] Usage procedure: When performing pipe bending operations, such as bending stainless steel pipes in a coiled tube heat exchanger, depending on the specific bending situation (push bending or pull bending of the steel pipe), select the steel pipe to abut against the corresponding arc-shaped pressure plate 4, and make it abut against the side of the roller 2 away from the arc-shaped pressure plate 4.

[0039] Specifically, the steel pipe is passed through roller 2 on one side and extended to roller 2 on the other side. It is initially aligned with the center line of the bend marked on the stainless steel pipe and the center line of the arc-shaped pressure plate 4. The steel pipe is then placed on the outer periphery of the arc-shaped pressure plate 4. The operating lever 6 is manually rotated to make the lead screw 5 rotate, which in turn drives the slider 3 to slide, that is, the arc-shaped pressure plate 4 slides.

[0040] The arc-shaped pressure plate 4 presses the steel pipe together and slowly fixes it on the two rollers 2. At this time, check whether the center line of the arc-shaped pressure plate 4 coincides with the center line of the bend. If there is a deviation, slightly rotate the screw 5 in the opposite direction to finely adjust the center position of the arc-shaped pressure plate 4. When the center line of the arc-shaped pressure plate 4 coincides with the center line of the bend, rotate the screw 5 to press the stainless steel pipe. With the continuous feeding of the screw 5, the bending of the stainless steel pipe is completed.

[0041] During the pipe bending process, the bending angle can be checked using a scale plate to ensure it is correct.

[0042] Advantages and benefits of innovative design:

[0043] 1. Reliable design, easy and flexible operation, mobile and capable of omnidirectional operation.

[0044] This innovative miniature handheld pipe bending device is lightweight and flexible, with an optimized frame design. The overall weight of the device allows for independent operation by the worker. Its design ensures high strength and sufficient rigidity to handle full-load operations smoothly. The frame utilizes an inverted triangular structure, leveraging the advantages of triangles in terms of stress distribution and stability. The bending force is also optimized by using three points of force to maximize torque. Due to the well-controlled dimensions and lightweight design, the device is easy for workers to handle and highly mobile, enabling omnidirectional operation in complex conditions and confined spaces.

[0045] 2. Easy centering of pipe bends, high precision and quality.

[0046] The pipe bending die design utilizes the principle of two points forming a straight line, adapting the design for stainless steel pipe bending alignment. It relies on the two endpoints of the inverted triangle of the frame support unit to arrange two rollers 2 for positioning and fitting the bending unit. During bending, the pipe is inserted and fitted into the first semi-circular groove, and the screw 5 is manually tightened. The center position of the pipe can be continuously adjusted during this process. When the center line of the arc-shaped pressure plate 4 coincides with the center line of the pipe, the pipe bending alignment is complete, which is very time-saving and easy. Due to the reasonable structural design, the bending radius of the pipe is accurately positioned, the bending force is uniform without abnormal deformation, and the dimensional accuracy of the bent pipe is high, meeting product standard requirements.

[0047] 3. It can perform arbitrary bends, two-way bends, and reverse bends.

[0048] The slider 3 of this miniature handheld pipe bending device is designed with a linear track, which improves bending accuracy and provides continuous bending driving force. To ensure that the stainless steel pipe bending machine can bend arbitrarily, bidirectionally, and in reverse, two arc-shaped pressure plates 4 of the same specification, angle, and radius of curvature are designed on the slider, ultimately perfectly achieving the above functional requirements. This functional design is perfectly realized in bending pipes in confined spaces and special locations.

[0049] 4. Stainless steel pipe bending saves time and effort and has high work efficiency.

[0050] This miniature handheld pipe bending device underwent multiple multi-angle CAD simulations and positioning demonstrations via computer to determine the optimal center positioning dimensions. The included angle of the arc-shaped pressure plate 4 was demonstrated using a computer to install and remove molds on stainless steel pipes of the same specifications, controlling the optimal angle for convenient loading and unloading of stainless steel pipes during bending. The stainless steel pipe bending machine's driving force is transmitted via a screw 5, which features reliable power transmission, strong load-bearing capacity, and labor-saving torque transmission, reducing worker fatigue. Due to its rational overall structural design, the stress distribution and deformation of the pipe during bending are optimally and precisely compensated, effectively improving the working efficiency of the stainless steel pipe bending machine.

[0051] 5. There is no limit to the length of the bent stainless steel pipe.

[0052] Traditional pipe bending machines are typically located within factories, with fixed work areas and limited working space. Due to space constraints, traditional pipe bending machines cannot bend longer or extra-long pipes. However, this miniature handheld pipe bending device overcomes the limitations of both pipe length and working space, and is suitable for on-site pipe bending in confined spaces, thus overcoming the limitations of traditional pipe bending machines in bending longer and extra-long pipes.

[0053] 6. Not limited by the working environment and work space.

[0054] Traditional pipe bending machines are typically limited by their working environment and location, making them unsuitable for mobile operations and limited to factory-scale bending in fixed locations. This fails to meet the requirements of special occasions and mobile pipe bending operations. This miniature handheld pipe bending device, however, is small in size, lightweight, and easy to operate. It boasts advantages such as portability, high flexibility, and mobile operation, adapting to any complex working condition and confined space—an advantage unmatched by traditional pipe bending machines.

[0055] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A micro hand-held pipe bending device, characterized by: It includes a grooved track, a nut seat at one end of the grooved track, two rollers rotatably connected to the other end of the grooved track, and a slider slidably connected within the grooved track; the two rollers are symmetrically arranged on both sides of the grooved track; the slider is provided with two arc-shaped pressure plates; a lead screw is threadedly connected to the nut seat; one end of the lead screw is rotatably connected to the slider, and the other end is slidably connected to an operating lever along the radial direction of the lead screw.

2. The tube bending apparatus of claim 1, wherein: The slider has an outwardly extending lug located outside the grooved track; the lead screw has two bearings located on either side of the outwardly extending lug.

3. The tube bending apparatus of claim 2, wherein: Two nuts are provided at the end of the lead screw near the slider; the nuts are located on the side of the bearing away from the operating lever; there are washers between the nuts and the two bearings.

4. A tube bending apparatus as claimed in any one of claims 1 to 3, wherein: A scale plate is provided on the grooved track; an indicator needle is provided on the slider; the indicator needle is directly opposite the scale plate.

5. The tube bending apparatus of claim 4 wherein: The scale plate has two sets of marks to indicate the bending angle of the tube when it is located on both sides of the roller; the indicator needle is directly opposite the marks.

6. A tube bending apparatus as claimed in any one of claims 1 to 3, wherein: The operating lever has end caps at both ends; the outer diameter of the end caps is larger than the outer diameter of the operating lever; the end caps are used to prevent the operating lever from disengaging from the lead screw.

7. A tube bending apparatus as claimed in any one of claims 1 to 3, wherein: Two support arms are symmetrically arranged on the grooved track near the end of the roller; the roller is rotatably connected to the end of the support arm; the end of the support arm and the end of the grooved track near the nut seat are provided with diagonal braces; the two diagonal braces and the two support arms form a triangular frame.

8. A tube bending apparatus as claimed in any one of claims 1 to 3, wherein: The included angle between the two sides of the arc-shaped pressure plate is 70°.

9. A tube bending apparatus as claimed in any one of claims 1 to 3, wherein: A connecting rod is provided at the end of the lead screw away from the arc-shaped pressure plate; the connecting rod is used to insert a power tool.

10. A tube bending apparatus as claimed in any one of claims 1 to 3, wherein: The roller has a first semicircular groove on its outer periphery; the arc-shaped pressure plate has a second semicircular groove on its outer periphery; the first semicircular groove and the second semicircular groove are located on the same plane.

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