Pipe bending equipment and pipe bending method for short-tail straight-line section pipe fitting
By designing a feed thrust device in the pipe bending equipment and applying appropriate thrust force to the tail end of the pipe fitting using the push rod, the problem of inclined mouth caused by the lack of thrust force in the pipe bending process in the prior art is solved. The reduction of raw material losses, simplification of processes and improvement of production efficiency have been achieved.
Patent Information
- Application Number
- CN202411622802.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-02-11
AI Technical Summary
When existing pipe bending equipment is processing short tail straight section pipe fittings, the tail end of the pipe fitting is prone to form inclined mouths, resulting in large raw material loss, high process complexity and low production efficiency.
A feeding pushing device including a feeding trolley, push rod device and mandrel device is designed. The pushing rod is penetrated into the material clip by the pushing rod driving mechanism, and appropriate pushing force is applied to the pushing rod through the thrust limiting mechanism to ensure that The tail end of the pipe fitting is fully supported during the pipe bending process.
Through the boost of the push rod, an inclined opening is prevented from occurring at the end of the pipe fitting, reducing raw material losses, simplifying the process flow, improving production efficiency, and improving the quality of finished pipe fittings.
Smart Images
Figure CN119406983A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of pipe bending processing technology, and in particular to a pipe bending device for pipe fittings with short tail straight sections. Background Art
[0002] like Figures 12 to 13 As shown, for pipe fittings with shorter tail straight sections, the existing pipe bending equipment uses the following method to bend pipe fittings 1: the material clamp 2 on the pipe bending equipment clamps the tail of the pipe fitting 1, the material clamp 2 feeds the material forward, the clamping die 4 and the circular die 3 on the pipe bending equipment clamp the pipe fitting 1, and the bending position on the pipe fitting 1 corresponds to the circular die 3; since the length of the tail straight section 1a of the pipe fitting 1 is shorter, the tail end of the pipe fitting 1 will enter the range of the backing die 5 during the pipe bending process. If the material clamp 2 continues to clamp and push the tail end of the pipe fitting 1, it will interfere with the backing die 5. Therefore, during the pipe bending process, the tail end of the pipe fitting 1 will not be pushed by the material clamp 2, so that the tail end of the pipe fitting 1 is in a state without push support. Figure 13 In the absence of a thrust force, the tail end of the pipe fitting 1 forms a bevel 1b due to inconsistent deformation of the inner and outer materials during the bending process. This bevel 1b needs to be removed during subsequent processing. Therefore, when preparing the pipe fitting raw material, the length of the pipe fitting needs to be appropriately lengthened to compensate for the length loss caused by the subsequent removal of the bevel 1b. This processing method results in significant material loss, poor economic efficiency, and the need for the additional bevel removal step increases process complexity and reduces production efficiency. Summary of the Invention
[0003] The purpose of the present invention is to solve the deficiencies in the prior art and to provide a pipe bending device and a pipe bending method for pipe fittings with short tail straight sections.
[0004] The object of the present invention is achieved through the following technical solution: a pipe bending device for short tail straight section pipe fittings, comprising a frame, a feeding and pushing device arranged on the frame, the feeding and pushing device comprising a feeding trolley, a push rod device, and a mandrel device, and a material clamp is provided on the feeding trolley;
[0005] The push rod device includes a push rod driving mechanism arranged on the feeding trolley, a push rod connected to the push rod driving mechanism, the push rod penetrates into the material clamp, and is driven by the push rod driving mechanism to move along its axial direction; the end of the push rod away from the push rod driving mechanism can pass through the front end of the material clamp; a thrust limiting mechanism is provided between the push rod and the material clamp; the core rod device includes a core rod driving component and a core rod connected to the core rod driving component, and the core rod passes through the push rod.
[0006] Preferably, the push rod driving mechanism includes a mounting frame and a push rod driving member. The mounting frame is fixedly mounted on the feeding trolley, the push rod driving cylinder is arranged on the mounting frame, and the push rod driving member is connected to the push rod.
[0007] Preferably, the push rod driving member is connected to the push rod through a connecting plate, a guide rod is provided on the push rod, a guide sleeve corresponding to the guide rod is provided on the mounting frame, and the guide rod and the guide sleeve are in sliding fit.
[0008] Preferably, the push rod driving member and the core rod driving member are both cylinders.
[0009] Preferably, the thrust limiting mechanism includes a thrust limiting ring arranged on the push rod and a thrust sleeve arranged on the material clamp, the thrust limiting ring includes end ring bodies located at both ends, an elastic sheet is provided between the two end ring bodies, and the elastic sheets are arranged between the two end ring bodies in a circular array; the elastic sheet is arc-shaped, and the elastic sheet protrudes toward the radial outside of the end ring body; a plurality of strip-shaped protrusions are provided in the middle position of the outer side of the elastic sheet; an annular groove is provided on the inner wall of the thrust sleeve; when the push rod pushes the tail end of the pipe fitting, the thrust limiting ring is located in the thrust sleeve; when the thrust of the push rod on the pipe fitting increases, the height of the bulge in the middle of the elastic member increases; when the pushing force of the push rod on the pipe fitting exceeds the set thrust value, the protrusion on the elastic member is stuck in the annular groove on the inner wall of the thrust sleeve to prevent the push rod from advancing.
[0010] Preferably, the elastic sheet is made of spring steel.
[0011] Preferably, the cross-sections of the protrusion and the annular groove are both triangular, and the maximum groove depth of the annular groove is 0.3-0.5 mm.
[0012] A pipe bending method, the method is as follows:
[0013] Step 1: Clamp the tail end of the pipe with the clamp and push it to the target position, then clamp the pipe with the clamp die and the round die;
[0014] Step 2: The material clamp releases the tail end of the pipe fitting, and the mandrel driving member drives the mandrel to extend forward and insert the mandrel into the pipe fitting; the push rod driving member drives the push rod to move and causes the front end of the push rod to abut against the tail end of the pipe fitting;
[0015] Step 3: The clamping die and the circular die rotate synchronously to bend the pipe fitting; during the bending process, a thrust is applied to the tail end of the pipe fitting through the push rod.
[0016] The beneficial effects of the present invention are:
[0017] 1. The push rod is used to help prevent the tail end of the pipe from being beveled, thereby eliminating the process of cutting the bevel, reducing the complexity of the process, improving production efficiency, and reducing the waste of raw materials.
[0018] 2. Through the boosting effect of the push rod, the thinning rate of the pipe during the bending process is reduced, and the pipe is prevented from wrinkling during the bending process, thereby improving the quality of the finished pipe.
[0019] 3. When bending a pipe, tensile and compressive stress distribution will be generated inside the pipe. Especially when the bending radius is small, this stress distribution is more obvious, which may cause the pipe to flatten or ovalize at the bent part. The present invention can balance these internal stresses to a certain extent by applying an appropriate boosting force to the tail end of the pipe, thereby reducing the deformation of the pipe and maintaining a better circular cross-section. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the present invention.
[0021] Figure 2 This is a schematic diagram of the structure of the present invention after removing the frame.
[0022] Figure 3 Schematic diagram of the structure of the push rod device.
[0023] Figure 4 It is a partial cross-sectional view of the feeding and pushing device.
[0024] Figure 5 Schematic diagram of the structure of the thrust limiting ring.
[0025] Figure 6 Schematic diagram of the structure of the raised part.
[0026] Figure 7 for Figure 4 Enlarged view of part A in the middle.
[0027] Figure 8 Schematic diagram of the structure of the thrust sleeve.
[0028] Figure 9 This is a schematic diagram of the present invention when bending a pipe.
[0029] Figure 10 It is a schematic diagram of a product obtained after a pipe is bent once using the present invention.
[0030] Figure 11 This is a schematic diagram of a product obtained by performing multiple bending processes on a pipe fitting according to the present invention.
[0031] Figure 12 This is a schematic diagram of an existing pipe bending device when bending a pipe fitting.
[0032] Figure 13 This is a schematic diagram of the product obtained after the existing pipe bending equipment bends the pipe fittings.
[0033] In the figure: 1, pipe fitting, 1a, tail straight section, 1b, bevel, 2, material clamp, 3, round die, 4, clamping die, 5, backing die, 8, frame, 10, feeding trolley, 11, core rod driving member, 12, core rod, 13, push rod driving member, 14, connecting plate, 15, push rod, 16, mounting frame, 17, guide rod, 18, thrust limiting ring, 18a, end ring body, 18b, elastic sheet, 18c, protrusion, 19, thrust sleeve, 19a, annular groove. DETAILED DESCRIPTION
[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.
[0035] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.
[0036] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.
[0037] like Figures 1 to 11 As shown, a pipe bending device for short-tail straight-segment pipe fittings includes a frame 8 and a feeding and pushing device arranged on the frame 8. The feeding and pushing device includes a feeding trolley 10, a push rod device, and a core rod device. The feeding trolley 10 is provided with a material clamp 2; the push rod device includes a push rod driving mechanism arranged on the feeding trolley 10 and a push rod 15 connected to the push rod driving mechanism. The push rod 15 penetrates into the material clamp 2 and is driven by the push rod driving mechanism to move along its axial direction; the end of the push rod 15 away from the push rod driving mechanism can pass through the front end of the material clamp 2; a thrust limiting mechanism is provided between the push rod 15 and the material clamp 2; the core rod device includes a core rod driving component 11 and a core rod 12 connected to the core rod driving component 11, and the core rod 12 passes through the push rod 15.
[0038] In the present invention, the material clamp 2 is used to clamp the pipe 1, and the feeding trolley 10 drives the material clamp 2 to move, thereby realizing the feeding process of the pipe 1. When the material clamp 2 clamps the tail end of the pipe 1, the front end of the push rod 15 retracts into the material clamp 2. During the pipe bending process, the push rod 15 assists the tail end of the pipe 1. At this time, the front end of the push rod 15 extends from the material clamp 2 and contacts the tail end of the pipe 1, and the push rod 15 applies a thrust to the tail end of the pipe 1. Even if the tail end of the pipe 1 enters the range of the support mold 5, the push rod 15 can still support the tail end of the pipe 1 and apply a thrust to it.
[0039] During the pipe bending process, the push rod 15 assists the pipe fitting 1, which can achieve the following effects: 1. The push rod 15 assists in preventing the bevel 1b from being generated at the tail end of the pipe fitting 1, thereby eliminating the process of cutting the bevel 1b, reducing the complexity of the process, improving production efficiency, and reducing the waste of raw materials. 2. The assisting effect of the push rod 15 reduces the thinning rate of the pipe fitting 1 during the bending process, prevents the pipe fitting 1 from wrinkling during the bending process, and improves the quality of the finished pipe fitting 1. 3. When bending a pipe, tensile and compressive stress distributions will be generated inside the pipe fitting 1. Especially when the bending radius is small, this stress distribution is more obvious, which may cause the pipe fitting 1 to flatten or ellipse in the bent portion. The present invention can balance these internal stresses to a certain extent by applying an appropriate assisting force to the tail end of the pipe fitting 1, reducing the deformation of the pipe material, and thus maintaining a better circular cross-section.
[0040] During the bending process of the pipe 1 , the mandrel driving member 11 drives the mandrel 12 to extend and insert into the pipe 1 , and the mandrel 12 supports the interior of the pipe 1 to reduce the concave deformation of the pipe 1 .
[0041] Specifically, the push rod driving mechanism includes a mounting frame 16 and a push rod driving member 13. The mounting frame 16 is fixedly mounted on the feeding trolley 10. The push rod 15 driving cylinder is mounted on the mounting frame 16. The push rod driving member 13 is connected to the push rod 15. The push rod 15 is driven to move by the push rod driving member 13.
[0042] The push rod driver 13 is connected to the push rod 15 via a connecting plate 14. The push rod 15 is provided with a guide rod 17. The mounting frame 16 is provided with a guide sleeve corresponding to the guide rod 17. The guide rod 17 and the guide sleeve are slidably engaged. The engagement between the guide sleeve and the guide rod 17 allows the push rod 15 to be guided.
[0043] In this embodiment, the push rod driving member 13 and the core rod driving member 11 are both cylinders.
[0044] Furthermore, the thrust limiting mechanism includes a thrust limiting ring 18 provided on the push rod 15 and a thrust sleeve 19 provided on the material clamp 2. The thrust limiting ring 18 includes end ring bodies 18a located at both ends, and an elastic sheet 18b is provided between the two end ring bodies 18a. The elastic sheet 18b is provided between the two end ring bodies 18a in a circular array; the elastic sheet 18b is in an arc shape, and the elastic sheet 18b protrudes toward the radial outer side of the end ring body 18a; a plurality of strip-shaped protrusions 1 are provided in the middle position of the outer side of the elastic sheet 18b. 8c; an annular groove 19a is provided on the inner wall of the thrust sleeve 19, and the annular grooves 19a are arranged in sequence along the axial direction of the thrust sleeve 19; when the push rod 15 pushes the tail end of the pipe fitting 1, the thrust limiting ring 18 is located in the thrust sleeve 19; when the thrust of the push rod 15 on the pipe fitting 1 increases, the height of the ridge in the middle of the elastic member increases; when the pushing force of the push rod 15 on the pipe fitting 1 exceeds the set thrust value, the protrusion 18c on the elastic member is stuck in the annular groove 19a on the inner wall of the thrust sleeve 19 to prevent the push rod 15 from advancing.
[0045] During pipe bending, excessive thrust applied by push rod 15 can have the following adverse consequences: 1. Damage to pipe 1: Excessive thrust can damage the surface or internal structure of pipe 1. This can lead to thinning, cracking, or even rupture of the pipe wall, particularly in cases of softer materials or thinner walls. 2. Positional deviation: Excessive thrust can also cause the pipe to deviate from the intended path during the bending process, affecting the dimensional accuracy and shape consistency of the final product. This not only reduces the quality of the finished product but also increases the workload of subsequent correction steps.
[0046] In the present invention, a thrust limiting mechanism is provided between the push rod 15 and the material clamp 2 to limit the thrust of the push rod 15, thereby preventing the above-mentioned adverse consequences caused by excessive thrust of the push rod 15. The principle of the thrust limiting mechanism is as follows: an annular gap is formed between the thrust sleeve 19 and the thrust limiting ring 18. When the push rod 15 applies thrust to the pipe 1, the end ring body 18a applies an extrusion force to the two ends of the elastic member, and the magnitude of the extrusion force is consistent with the magnitude of the thrust; after the elastic member is subjected to the extrusion force, the middle part of the elastic member will bulge outward, and the greater the thrust, the greater the bulge height; when the push rod 15 pushes the pipe 1 to exceed the set thrust value, the raised portion 18c on the elastic member will bulge outward. The push rod 15 is inserted into the annular groove 19a on the inner wall of the thrust sleeve 19. The protrusion 18c cooperates with the annular groove 19a to lock the push rod 15 in its current position, preventing further thrust of the push rod 15 and thus preventing the continued increase of the thrust force. When the thrust decreases below the set thrust value, the elastic member will return to its original shape, and the height of the elastic member will decrease, thereby separating the protrusion 18c on the elastic member from the inner wall of the thrust sleeve 19, allowing the push rod 15 to continue to advance. In this way, the thrust of the push rod 15 on the pipe fitting 1 can be limited to below the set thrust value, thereby preventing the pipe fitting 1 from being damaged or shifted due to excessive thrust of the push rod 15.
[0047] The cross sections of the protrusion 18c and the annular groove 19a are both triangular, and the maximum groove depth of the annular groove 19a is 0.3-0.5 mm.
[0048] In this embodiment, the elastic piece 18b is made of spring steel.
[0049] A pipe bending method comprises the following specific steps:
[0050] Step 1: The material clamp 2 clamps the tail end of the pipe 1 and pushes the material clamp 2 to the target position, and the pipe 1 is clamped by the clamping die 4 and the circular die 3;
[0051] Step 2: The material clamp 2 releases the tail end of the pipe 1, and the mandrel driving member 11 drives the mandrel 12 to extend forward and insert the mandrel 12 into the pipe 1; the push rod driving member 13 drives the push rod 15 to move and make the front end of the push rod 15 abut against the tail end of the pipe 1;
[0052] Step 3: The clamping die 4 and the circular die 3 rotate synchronously to bend the pipe 1; during the bending process, a thrust is applied to the tail end of the pipe 1 through the push rod 15.
[0053] The pipe 1 processed by the present invention is as follows Figures 10 and 11 As shown, there is no bevel 1b at the tail end of the pipe 1, so there is no need to perform a bevel cutting process.
[0054] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.
Claims
1. A pipe bending device for short tail straight section pipe fittings, characterized in that: It includes a frame and a feeding pushing device arranged on the frame. The feeding pushing device includes a feeding trolley, a push rod device and a core rod device. The feeding trolley is provided with a material clamp. The push rod device includes a push rod driving mechanism arranged on the feeding trolley, a push rod connected to the push rod driving mechanism, the push rod penetrates into the material clamp, and the push rod is driven by the push rod driving mechanism to move along its axial direction; One end of the push rod away from the push rod driving mechanism can pass through the front end of the material clamp; a thrust limiting mechanism is provided between the push rod and the material clamp; the mandrel device includes a mandrel driving member and a mandrel connected to the mandrel driving member, and the mandrel passes through the push rod.
2. The pipe bending device for short tail straight section pipe fittings according to claim 1, characterized in that: The push rod driving mechanism comprises a mounting frame and a push rod driving member. The mounting frame is fixedly arranged on the feeding trolley, the push rod driving cylinder is arranged on the mounting frame, and the push rod driving member is connected to the push rod.
3. The pipe bending device for short tail straight section pipe fittings according to claim 2, characterized in that: The push rod driving member is connected to the push rod through a connecting plate. The push rod is provided with a guide rod. The mounting frame is provided with a guide sleeve corresponding to the guide rod. The guide rod and the guide sleeve are slidably matched.
4. The pipe bending device for short tail straight section pipe fittings according to claim 1, characterized in that: The push rod driving member and the core rod driving member are both cylinders.
5. The pipe bending device for short tail straight section pipe fittings according to claim 1, characterized in that: The thrust limiting mechanism comprises a thrust limiting ring arranged on the push rod and a thrust sleeve arranged on the material clamp, the thrust limiting ring comprises end ring bodies located at both ends, an elastic sheet is arranged between the two end ring bodies, and the elastic sheet is arranged between the two end ring bodies in a circular array; the elastic sheet is in an arc shape, and the elastic sheet protrudes toward the radial outer side of the end ring body; a plurality of strip-shaped protrusions are arranged at the middle position of the outer side of the elastic sheet; an annular groove is arranged on the inner wall of the thrust sleeve; When the push rod pushes the tail end of the pipe, the thrust limiting ring is located in the thrust sleeve; when the thrust of the push rod on the pipe increases, the bulge height of the middle part of the elastic part increases; when the push force of the push rod on the pipe exceeds the set thrust value, the protrusion on the elastic part is stuck in the annular groove on the inner wall of the thrust sleeve to prevent the push rod from advancing.
6. The pipe bending device for short tail straight section pipe fittings according to claim 5, characterized in that: The elastic sheet is made of spring steel.
7. The pipe bending device for short tail straight section pipe fittings according to claim 5, characterized in that: The cross sections of the protrusion and the annular groove are both triangular, and the maximum groove depth of the annular groove is 0.3-0.5 mm.
8. A pipe bending method, based on the pipe bending device for short tail straight section pipe fittings according to any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: Clamp the tail end of the pipe with a clamp and push it to the target position, and clamp the pipe with a clamping die and a round die; Step 2: The material clamp releases the tail end of the pipe fitting, and the mandrel driving member drives the mandrel to extend forward and insert the mandrel into the pipe fitting; The push rod driving member drives the push rod to move and causes the front end of the push rod to abut against the rear end of the pipe fitting; Step 3: The clamping die and the round die rotate synchronously to bend the pipe fitting; during the bending process, a thrust is applied to the tail end of the pipe fitting through a push rod.