Replaceable hollow spiral pipe bending mandrel

Abstract

The utility model provides a replaceable hollow spiral pipe bending core shaft which comprises a core rod, a shaft sleeve, a pipe groove core sleeve and a locking nut. The three pipe groove core sleeves comprise the pipe groove core sleeve I, the pipe groove core sleeve II and the pipe groove core sleeve III. The locking nut is connected with the core rod; the three pipe groove core sleeves are connected with the shaft sleeve through the circle splicing notches and arranged on the outer wall of the core rod in a sleeving mode. According to the utility model, through the design of the detachable mandrel, secondary deformation is avoided, and the disassembly difficulty is reduced; a pipe groove core sleeve in the mandrel is tightly matched with the hollow spiral pipe, so that the size precision in the bending process is ensured; the bending process is simplified, and the requirement for skills of workers and the operation difficulty are reduced; through the design of the replaceable core sleeve, cost reduction and efficiency improvement are realized; the hollow spiral pipe bending device is suitable for bending hollow spiral pipes of different specifications and sizes, and universality is improved; and the assembly of the mandrel is simplified, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of process equipment design and manufacturing, and particularly relates to a replaceable hollow spiral pipe bending mandrel for realizing high-precision bending of a hollow spiral pipe and facilitating disassembly to reduce secondary deformation and damage. BACKGROUND

[0002] In the existing hollow spiral pipe bending process, different specifications and sizes of hollow spiral pipes usually need to be bent. Due to the different bending specifications and sizes, a special mandrel needs to be processed each time, which results in that the mandrel cannot be shared and is only suitable for the processing of batch bending pipes of the same specification and size. For the production of small-batch bending pipes, the utilization rate of the mold is low, and the cost is high.

[0003] The conventional bending mandrel design is prone to secondary deformation of the hollow spiral pipe during disassembly after bending, which increases the difficulty of subsequent assembly. In addition, the entire mandrel needs to be reprocessed each time different specifications of spiral pipes are bent, which results in high processing cost, long cycle, and the inability to reuse other parts of the mandrel.

[0004] To solve the above problems, some improvement schemes are proposed in the prior art, such as improving the size accuracy of the spiral pipe by making a special mandrel to reduce secondary deformation during disassembly of the bent pipe. However, these schemes still have problems such as the mandrel being unable to be shared, high processing cost, and complex operation. Therefore, there is an urgent need for a bending mandrel design that can improve the bending accuracy, reduce the operation difficulty, reduce the secondary deformation, and achieve cost reduction and efficiency improvement. UTILITY MODEL CONTENTS

[0005] Based on the above problems, the purpose of the utility model is to provide a high-precision, replaceable, and secondary deformation-reducing hollow spiral pipe bending mandrel design to solve the problems of the mandrel being unable to be shared, high processing cost, and complex operation in the prior art, thereby optimizing the bending process and reducing the cost.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A replaceable hollow spiral pipe bending mandrel includes a core rod, a shaft sleeve, a pipe slot core sleeve, and a locking nut. The pipe slot core sleeve has three, including pipe slot core sleeve I, pipe slot core sleeve II, and pipe slot core sleeve III. The locking nut is connected to the core rod. The three pipe slot core sleeves are connected to the shaft sleeve through a round gap and are sleeved on the outer wall of the core rod.

[0008] As a preferred mode, the core rod end is provided with a threaded structure.

[0009] Further preferably, the inner wall of the locking nut is provided with a threaded structure matched with the threaded end of the core rod.

[0010] As a preferred mode, the outer wall of the pipe groove core sleeve I, the pipe groove core sleeve II and the pipe groove core sleeve III is provided with a groove matched with the inner wall of the hollow spiral pipe, and the continuous pipe groove structure is formed after splicing.

[0011] As a preferred mode, the pipe groove core sleeve I is automatically separated from the mandrel when the mandrel is rotated out, facilitating quick disassembly and replacement.

[0012] As a preferred mode, the pipe groove core sleeve is provided with a groove depression (splicing gap) for positioning and limiting, and the shaft sleeve is sleeved on the groove of the pipe groove core sleeve. The three pipe groove core sleeves are 60°, 150° and 150° sectors respectively, the 60° pipe groove core sleeve is finally placed in the shaft sleeve, and then the mandrel is rotated in.

[0013] The utility model discloses the beneficial effects are:

[0014] The hollow spiral pipe can be easily disassembled after bending, secondary deformation is avoided, and the disassembly difficulty is reduced. The pipe groove core sleeve in the mandrel is closely matched with the hollow spiral pipe, the size precision in the bending process is ensured, and subsequent assembly difficulty is reduced. The bending process is simplified, the requirement for worker's skill and operation difficulty are reduced, physical labor intensity and operation danger are reduced. Through the replaceable core sleeve design, when the pipe size changes, only the core sleeve needs to be reprocessed, other parts can be reused, the tooling cost is reduced by 82%, and cost reduction and benefit increase are realized. The utility model is suitable for different specifications and sizes of hollow spiral pipe bending, reduces the processing demand of special mold, and improves the universality. The assembly of the mandrel is simplified, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the mandrel;

[0016] Figure 2 It is a schematic view of the pipe groove core sleeve;

[0017] Figure 3 It is a schematic view of a replaceable hollow spiral pipe bending mandrel;

[0018] Figure 4 It is Figure 3 the side view.

[0019] Wherein, 1 is the mandrel;2 is the locking nut;3 is the shaft sleeve;4 is the pipe groove core sleeve I;5 is the pipe groove core sleeve II;6 is the pipe groove core sleeve III. DETAILED DESCRIPTION

[0020] The utility model will be further explained in detail in combination with the drawings.

[0021] Example 1:

[0022] A replaceable hollow spiral pipe bending mandrel, comprising a mandrel 1, a sleeve 3, pipe slot mandrel, locking nut 2; the pipe slot mandrel has three, including pipe slot mandrel I 4, pipe slot mandrel II 5 and pipe slot mandrel III 6; the locking nut 2 is connected with the mandrel 1; the three pipe slot mandrels are connected with the sleeve 3 through the round gap and are sleeved on the outer wall of the mandrel 1.

[0023] As a preferred mode, the end of the mandrel 1 is provided with a threaded structure.

[0024] Further preferably, the inner wall of the locking nut 2 is provided with a threaded structure matched with the threaded end of the mandrel 1.

[0025] As a preferred mode, the outer wall of the pipe slot mandrel I 4, the pipe slot mandrel II 5 and the pipe slot mandrel III 6 is provided with a groove matched with the inner wall of the hollow pipe, and the continuous pipe slot structure is formed after the round gap.

[0026] As a preferred mode, the pipe slot mandrel I 4 is automatically separated from the mandrel when the mandrel is rotated out, facilitating quick disassembly and replacement.

[0027] Example 2:

[0028] A replaceable hollow spiral pipe bending mandrel, comprising a mandrel 1, a sleeve 3, pipe slot mandrel, locking nut 2; the pipe slot mandrel has three, including pipe slot mandrel I 4, pipe slot mandrel II 5 and pipe slot mandrel III 6; the locking nut 2 is connected with the mandrel 1; the three pipe slot mandrels are connected with the sleeve 3 through the round gap and are sleeved on the outer wall of the mandrel 1.

[0029] Notes during use:

[0030] 1) When assembling the tooling each time, pay attention to that the sleeve is assembled first and then the three pipe slot mandrels are rounded.

[0031] 2) Round and mandrel 1 rotation are performed simultaneously, and attention should be paid to the positioning of the sleeve and the three pipe slot mandrel gap positions during rotation to avoid "stuck" due to exceeding the limit.

[0032] 3) When the mandrel 1 is rotated out, pay attention to avoid the tooling from being knocked when the pipe slot mandrel I 4 falls off.

[0033] 4) bending process of elbow pipe stress, may be with pipe tank partial "clamping", disassembly should not be forced to disassemble, causing elbow pipe deformation, can be taken down with rubber hammer.

[0034] The above embodiments of the utility model are merely examples for illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, other different forms of changes and variations can be made on the basis of the above description. It is impossible to exhaust all the embodiments here. Any obvious changes or variations derived from the technical solutions of the utility model still fall within the protection scope of the utility model.

Claims

1. A replaceable hollow auger bend mandrel characterized by, Include: Core rod, shaft sleeve, pipe slot core sleeve, locking nut; The pipe slot core sleeve has three, including pipe slot core sleeve I, pipe slot core sleeve II and pipe slot core sleeve III; the locking nut is connected with the core rod; the three pipe slot core sleeves are connected with the shaft sleeve through a circular gap and are sleeved on the outer wall of the core rod.

2. A replaceable hollow toroid mandrel according to claim 1, wherein: The end of the core rod is provided with a threaded structure.

3. A replaceable hollow toroid mandrel according to claim 2, wherein: The inner wall of the locking nut is provided with a threaded structure matched with the threaded end of the core rod.

4. A replaceable hollow toroid mandrel according to claim 1, wherein: The outer wall of the pipe slot core sleeve I, the pipe slot core sleeve II and the pipe slot core sleeve III are all provided with a groove matched with the inner wall of the hollow pipe, and the continuous pipe slot structure is formed after the circle is connected.

5. The replaceable hollow toroid mandrel of claim 1 wherein: The pipe slot core sleeve I automatically falls off with the core rod when the core rod is rotated out.

6. A replaceable hollow toroid mandrel according to claim 1, wherein: The pipe slot core sleeve is provided with a groove depression for positioning and limiting, and the shaft sleeve is sleeved at the groove of the pipe slot core sleeve.

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