A pipe bending die

Abstract

The present invention discloses a pipe bending die, which includes a pipe bending wheel, a wheel die and a clamping die. The wheel die is fixed on the pipe bending wheel. The wheel die and the clamping die can be closed to clamp a pipe fitting or be separated to release the pipe fitting. A tabletop for directly placing the pipe fitting is provided on the wheel die, and a mating surface corresponding to the tabletop is formed on the clamping die. When the wheel die and the clamping die are closed, the tabletop and the mating surface enclose a clamping cavity for accommodating the pipe fitting to clamp the pipe fitting. A pillow position for locking and limiting the wheel die and the clamping die is further provided on the wheel die and / or the clamping die. The technical solution of the present invention is simple and convenient to operate. During the pipe bending process, the pipe fitting is not easy to deform, bulge or wrinkle, etc. The pipe fitting is easy to demold, and it is applicable to pipe fittings of wide-edge types, with better versatility.

Description

Technical Field

[0001] The present invention relates to a pipe bending die for bending a straight pipe. Background Art

[0002] A pipe bending die is a die for bending a straight pipe into a bent pipe, and generally includes a pipe bending wheel 10', a wheel die 20' and a clamping die 30'. The wheel die 20' is fixed on the pipe bending wheel 10'. When the wheel die 20' and the clamping die 30' are closed, one end of the straight pipe 40' can be clamped. The pipe bending wheel 10' is installed and positioned on a driving device, and driven by the driving force of the driving device to rotate. The pipe bending wheel 10' drives the wheel die 20' and the clamping die 30', and the wheel die 20' and the clamping die 30' further drive the straight pipe 40' to bend around the pipe bending wheel 10', so as to obtain a bent pipe 50'.

[0003] As Figures 1 to 3 shown, in the existing pipe bending die, generally a slot 21' and a slot 31' are respectively arranged at corresponding positions on the wheel die 20' and the clamping die 30'. During operation, one side of the straight pipe 40' is first inserted into the slot 21' on the wheel die. When the wheel die 20' and the clamping die 30' are closed, the other side of the straight pipe 40' will be correspondingly inserted into the slot 31' on the clamping die 30'. The slot 21' on the wheel die 20' and the slot 31' on the clamping die 30' enclose a clamping cavity for accommodating the straight pipe 40'.

[0004] The inventor found that the existing pipe bending die has at least the following defects: (1) It is necessary to insert the straight pipe 40' into the slots 21' and 31' on the wheel die 20' and the clamping die 30', and it is difficult to place the straight pipe 40'; (2) During the pipe bending process, the product is prone to deformation, bulging and wrinkling; (3) After the pipe bending process is completed, the formed bent pipe 50' will tightly hold the pipe bending wheel 10', and it is difficult to demold the bent pipe 50'; (4) It is not applicable to pipe fittings of wide-edge types. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a pipe bending die, which has the advantages of simple and convenient operation, not being prone to deformation, bulging and wrinkling during the pipe bending process, being easy to demold the bent pipe, and being applicable to pipe fittings of wide-edge types, with better versatility.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A pipe bending die, comprising a pipe bending wheel, a wheel die and a clamping die. The wheel die is fixed on the pipe bending wheel. The wheel die and the clamping die can be closed to clamp a pipe fitting or separated to release the pipe fitting. A tabletop for directly placing the pipe fitting is provided on the wheel die, and a mating surface corresponding to the tabletop is formed on the clamping die. When the wheel die and the clamping die are closed, the tabletop and the mating surface enclose a clamping cavity for accommodating the pipe fitting to clamp the pipe fitting. A locating block for locking and limiting the wheel die and the clamping die is further provided on the wheel die and / or the clamping die.

[0008] For the pipe bending die of the present invention, by providing a tabletop on the wheel die for directly placing the pipe fitting and forming a mating surface corresponding to the tabletop on the clamping die, in this way, the pipe fitting only needs to be directly placed on the tabletop, thus there is no need to insert the pipe fitting into the corresponding slot as in the background art solution. The placement of the pipe fitting in the present invention is more convenient and easy, and the pipe bending and demolding are also very convenient and easy. This kind of pipe bending die with a tabletop where the pipe fitting can be directly placed is also applicable to bending pipe fittings of the wide-side type, with a wider application range.

[0009] In addition, since a locating block for locking and limiting the wheel die and the clamping die is further provided on the wheel die and / or the clamping die, during pipe bending, the locating block always maintains a locked and limited state, so that the pipe fitting cannot move up, down, left or right, thereby making the pipe fitting not easily deformed, bulged or wrinkled during the pipe bending process.

[0010] Preferably, the tabletop includes a connected transverse tabletop and a longitudinal tabletop, and the mating surface includes a connected transverse mating surface and a longitudinal mating surface. When the wheel die and the clamping die are closed, the transverse tabletop, the longitudinal tabletop, the transverse mating surface and the longitudinal mating surface enclose the clamping cavity, and the contour of the cross-section of the clamping cavity matches the contour of the cross-section of the pipe fitting. In the above technical solution, the cross-section of the wheel die and the clamping die in the direction perpendicular to the placement direction of the pipe fitting is L-shaped, and the two L-shaped dies are diagonally combined to form the clamping cavity. The design of the tabletop and the mating surface is ingenious and the structure is simple.

[0011] Preferably, it further includes a guiding die. A bearing surface is formed on the pipe bending wheel, and the bearing surface is flush with the transverse tabletop. The guiding die is detachably mated with the bearing surface to enclose a guiding cavity for accommodating the pipe fitting, and the guiding cavity is communicated with the clamping cavity. By providing a guiding die to guide the straight pipe, the pipe bending process is smoother and the effect is better.

[0012] Preferably, it further includes a straightening die. The straightening die is placed on the bearing surface and is movably mated with the pipe bending wheel. The straightening die, the guiding die and the transverse tabletop jointly enclose the guiding cavity. By providing a straightening die to guide the straight pipe, the pipe bending process is further smoother and the effect is better.

[0013] Preferably, the wheel mold and the clamping mold are respectively provided with the pillow positions. Correspondingly, the clamping mold and the wheel mold are provided with pillow position grooves that cooperate with the pillow positions. When the wheel mold and the clamping mold are closed, the pillow positions are inserted into the pillow position grooves to form locking and limiting.

[0014] Preferably, one end of the transverse table surface away from the longitudinal table surface is provided with a first pillow position, and the longitudinal mating surface is provided with a first pillow position groove that cooperates with the first pillow position; one end of the transverse mating surface away from the longitudinal mating surface is provided with a second pillow position, and the longitudinal table surface is provided with a second pillow position groove that cooperates with the second pillow position.

[0015] Preferably, a chamfered corner is formed at the outer end of the pillow position. In the above technical solution, by forming a chamfered corner at the outer end of the pillow position, it can effectively prevent the pipe fitting from being clamped or scratched by the outer end of the pillow position during the process of closing the wheel mold and the clamping mold.

[0016] Preferably, it further includes a bending mandrel inserted into the pipe fitting. The bending mandrel is provided with a chain structure, and the chain structure is formed by connecting a plurality of chain links in series. By adopting the bending mandrel with a chain structure, the bending mandrel is flexible in movement, can be applicable to pipe fittings with various bending degrees, and can effectively reduce the deformation during the pipe bending process.

[0017] Preferably, the connection between the chain links of the chain structure is detachable. By designing the connection between the chain links to be detachable, the number of chain links can be selected according to actual needs, and the versatility is better.

[0018] Preferably, the wheel mold is fixed on the bending wheel through fasteners, and a dovetail groove structure is adopted for positioning between the wheel mold and the bending wheel. Adopting the dovetail groove structure for positioning between the wheel mold and the bending wheel has a simple structure and is convenient for assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, form a part of the present invention, and the schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 is a three-dimensional structural schematic diagram of the wheel mold and the clamping mold of a prior art pipe bending mold in a separated mold state;

[0021] Figure 2 is a three-dimensional structural schematic diagram of the wheel mold and the clamping mold of a prior art pipe bending mold in a closed mold state;

[0022] Figure 3 is a three-dimensional structural schematic diagram of a prior art pipe bending mold at the end of pipe bending;

[0023] Figure 4 Explosion view of the elbow bending die according to an embodiment of the present invention;

[0024] Figure 5 Schematic perspective view of the wheel die and the clamping die of the elbow bending die according to an embodiment of the present invention in a separated die state;

[0025] Figure 6 Schematic perspective view of the wheel die and the clamping die of the elbow bending die according to an embodiment of the present invention in a combined die state;

[0026] Figure 7 Schematic perspective view of the elbow bending die according to an embodiment of the present invention at the end of the elbow bending;

[0027] Figure 8 Schematic perspective view of the elbow bending die according to an embodiment of the present invention at the end of the elbow bending;

[0028] Figure 9 Schematic diagram of the cooperation between the wheel die and the elbow bending wheel of the elbow bending die according to an embodiment of the present invention;

[0029] Figure 10 Schematic perspective view of the elbow bending mandrel of the elbow bending die according to an embodiment of the present invention;

[0030] Figure 11 Another schematic diagram of the cross-sectional contour of the pipe fitting of the present invention;

[0031] Figure 12 Another schematic diagram of the cross-sectional contour of the pipe fitting of the present invention.

[0032] Reference numerals are:

[0033] 10 - elbow bending wheel; 11 - bearing surface;

[0034] 20 - wheel die; 21 - table surface; 211 - transverse table surface; 212 - longitudinal table surface; 22 - first pillow position; 23 - second pillow position groove;

[0035] 30 - clamping die; 31 - mating surface; 311 - transverse mating surface; 312 - longitudinal mating surface; 32 - first pillow position groove; 33 - second pillow position;

[0036] 40 - pipe fitting; 50 - elbow;

[0037] 60 - guiding die; 70 - straightening die;

[0038] 80 - elbow bending mandrel; 81 - chain structure; 90 - dovetail groove structure. Detailed implementation manners

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Please refer to Figures 4 to 10 , a pipe bending die of a preferred embodiment of the present invention includes a pipe bending wheel 10, a wheel die 20 and a clamping die 30. The wheel die 20 is fixed to the pipe bending wheel 10 through fasteners (screws). The wheel die 20 and the clamping die 30 can be closed to clamp the pipe fitting 40 or separated to release the pipe fitting 40. A table surface 21 for directly placing the pipe fitting 40 is provided on the wheel die 20, and a mating surface 31 corresponding to the table surface 21 is formed on the clamping die 30. When the wheel die 20 and the clamping die 30 are closed, the table surface 21 and the mating surface 31 enclose a clamping cavity for accommodating the pipe fitting 40 to clamp the pipe fitting 40. By providing a table surface 21 for directly placing the pipe fitting 40 on the wheel die 20 and forming a mating surface 31 corresponding to the table surface 21 on the clamping die 30, in this way, the pipe fitting 40 only needs to be directly placed on the table surface 21, so there is no need to insert the pipe fitting 40 into the corresponding slots 21' and 31' as in the background art solution. The placement of the pipe fitting 40 of the present invention is more convenient and easier, and the demolding of the bent pipe 50 is also very convenient and easy. This pipe bending die with the pipe fitting 40 that can be directly placed on the table surface 21 is also applicable to bending pipe fittings 40 of the wide-side type, and has a wider application range.

[0041] A pillow position for locking and limiting the wheel die 20 and the clamping die 30 is also provided on the wheel die 20 and / or the clamping die 30. During pipe bending, the pillow position always maintains the locked and limited state, so that the pipe fitting 40 cannot move up, down, left or right, so that the pipe fitting 40 is not easily deformed, bulged and wrinkled during the pipe bending process.

[0042] Specifically, in this embodiment, the table surface 21 includes a connected transverse table surface 21 and a longitudinal table surface 21, and the mating surface 31 includes a connected transverse mating surface 31 and a longitudinal mating surface 31. In this way, the cross-section of the wheel die 20 and the clamping die 30 in the direction perpendicular to the placement direction of the pipe fitting 40 is L-shaped. When the wheel die 20 and the clamping die 30 are closed, the transverse table surface 21, the longitudinal table surface 21, the transverse mating surface 31 and the longitudinal mating surface 31 enclose the clamping cavity. That is, the two L-shaped dies are diagonally combined to form the clamping cavity, and the contour of the cross-section of the clamping cavity matches the contour of the cross-section of the pipe fitting 40. The design of forming the table surface 21 and the mating surface 31 is ingenious and the structure is simple. The contour of the cross-section of the pipe fitting 40 in this embodiment is specifically rectangular. Of course, the contour of the cross-section of the pipe fitting 40 can also be square, runway-shaped or other shapes, etc., and is not limited thereto. For example, as Figure 11 shown in the pipe fitting 40, the contour of its cross-section is runway-shaped, as Figure 12The shown pipe fitting 40 has a cross-sectional contour with a pair of parallel sides and a pair of symmetric arc-shaped sides. Figure 11 and Figure 12 The pipe fitting 40 of is also wide-sided. Of course, the present invention is also applicable to narrow-sided pipe fitting structures.

[0043] In this embodiment, in order to make the pipe bending process smoother and more effective, the pipe bending die further includes a guiding die 60. A bearing surface 11 is formed on the pipe bending wheel 10, and the bearing surface 11 is flush with the transverse table surface 21. The guiding die 60 is detachably engaged with the bearing surface 11 to enclose a guiding cavity for accommodating the pipe fitting 40, and the guiding cavity is communicated with the clamping cavity.

[0044] In order to further make the pipe bending process smoother and more effective, in this embodiment, a straightening die 70 is further included. The straightening die 70 is placed on the bearing surface 11 and is movably engaged with the pipe bending wheel 10. The straightening die 70, the guiding die 60, and the transverse table surface 21 jointly enclose the guiding cavity, and the straightening die 70 can be used to guide the straight pipe.

[0045] In this embodiment, the wheel die 20 and the clamping die 30 are respectively provided with locating positions. Correspondingly, the clamping die 30 and the wheel die 20 are provided with locating position grooves that cooperate with the locating positions. When the wheel die 20 and the clamping die 30 are closed, the locating positions are inserted into the locating position grooves to form a locking limit. In this way, during pipe bending, the locating positions always maintain the locking limit state, and the pipe fitting 40 cannot move up, down, left, or right, so that the pipe fitting 40 is not easily deformed, bulged, or wrinkled during the pipe bending process. Specifically, a first locating position 22 is provided at one end of the transverse table surface 21 away from the longitudinal table surface 21, and a first locating position groove 32 that cooperates with the first locating position 22 is provided on the longitudinal mating surface 31; a second locating position 33 is provided at one end of the transverse mating surface 31 away from the longitudinal mating surface 31, and a second locating position groove 23 that cooperates with the second locating position 33 is provided on the longitudinal table surface 21.

[0046] In order to effectively prevent the pipe fitting 40 from being pinched or scratched by the outer ends of the locating positions during the closing process of the wheel die 20 and the clamping die 30, in this embodiment, the outer ends of the locating positions are formed with rounded corners.

[0047] Please refer to Figure 1 and Figure 10 , in this embodiment, a pipe bending mandrel 80 for being inserted into the pipe fitting 40 is further included. A chain structure 81 is provided on the pipe bending mandrel 80, and the chain structure 81 is formed by connecting a plurality of chain links in series. By using the pipe bending mandrel 80 with the chain structure 81, the pipe bending mandrel 80 is flexible in movement, can be applicable to pipe bends 50 with various bending degrees, and can effectively reduce the deformation during the pipe bending process.

[0048] Specifically, in this embodiment, the links of the chain structure 81 are detachably connected. By designing the connection between the links to be detachable, the number of links can be selected according to the actual requirements such as the bending degree and length of the bent pipe, and the versatility is better.

[0049] Please refer to Figure 9 , in order to facilitate the fixed connection between the wheel mold 20 and the pipe bending wheel 10, a dovetail groove structure 90 is used for positioning between the wheel mold 20 and the pipe bending wheel 10, so that the structure is simple and the assembly of the two is more convenient.

[0050] Please refer to Figures 5 to 8 , Figure 5 is a three-dimensional structural schematic diagram of the wheel mold 10 and the clamping mold 30 of the pipe bending mold in the separated mold state in this embodiment; Figure 6 is a three-dimensional structural schematic diagram of the wheel mold 10 and the clamping mold 30 of the pipe bending mold in the combined mold state in this embodiment; Figure 7 is one of the three-dimensional structural schematic diagrams of the pipe bending mold at the end of pipe bending in this embodiment; Figure 8 is the second three-dimensional structural schematic diagram of the pipe bending mold at the end of pipe bending in this embodiment.

[0051] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and alterations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A pipe bending die, comprising a pipe bending wheel, a wheel die and a clamping die, wherein the wheel die is fixed on the pipe bending wheel, and the wheel die and the clamping die can be closed to clamp a pipe fitting or be separated to release the pipe fitting, characterized in that, The wheel die is provided with a tabletop for directly placing the pipe fitting, and the clamping die is formed with a mating surface corresponding to the tabletop. When the wheel die and the clamping die are closed, the tabletop and the mating surface enclose a clamping cavity for accommodating the pipe fitting to clamp the pipe fitting. The wheel die and / or the clamping die are also provided with a locating block for locking and limiting the wheel die and the clamping die; The tabletop includes a connected transverse tabletop and a longitudinal tabletop, and the mating surface includes a connected transverse mating surface and a longitudinal mating surface. When the wheel die and the clamping die are closed, the transverse tabletop, the longitudinal tabletop, the transverse mating surface and the longitudinal mating surface enclose the clamping cavity, and the contour of the cross-section of the clamping cavity matches the contour of the cross-section of the pipe fitting; The wheel die and the clamping die are respectively provided with the locating blocks. Correspondingly, the clamping die and the wheel die are provided with locating block grooves matching the locating blocks. When the wheel die and the clamping die are closed, the locating blocks are inserted into the locating block grooves to form locking and limiting; A first locating block is provided at one end of the transverse tabletop away from the longitudinal tabletop, and a first locating block groove matching the first locating block is provided on the longitudinal mating surface; a second locating block is provided at one end of the transverse mating surface away from the longitudinal mating surface, and a second locating block groove matching the second locating block is provided on the longitudinal tabletop.

2. The elbow die according to claim 1, characterized in that, It further includes a guiding die. A bearing surface is formed on the bending wheel, and the bearing surface is flush with the transverse tabletop. The guiding die is detachably mated with the bearing surface to enclose a guiding cavity for accommodating the pipe fitting, and the guiding cavity is communicated with the clamping cavity.

3. A pipe bending die according to claim 2, characterized in that, It further includes a straightening die. The straightening die is placed on the bearing surface and is movably mated with the bending wheel. The straightening die, the guiding die and the transverse tabletop jointly enclose the guiding cavity.

4. A bending die according to claim 1, characterized in that, The outer end of the locating block is formed with a chamfered corner.

5. The elbow die according to claim 1, characterized in that, It further includes a bending mandrel inserted into the pipe fitting. A chain structure is provided on the bending mandrel, and the chain structure is formed by connecting a plurality of chain links in series.

6. The elbow die according to claim 5, characterized in that, The chain links of the chain structure are detachably connected to each other.

7. A pipe bending die according to claim 1, characterized in that, The wheel die is fixed on the bending wheel through fasteners, and a dovetail groove structure is adopted for positioning between the wheel die and the bending wheel.

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