Mandrel seat capable of automatically adjusting concentricity

Abstract

The utility model discloses a mandrel seat capable of automatically adjusting concentricity, which comprises a mandrel seat shell used for supporting, a threaded guide groove used for butt joint is arranged at an opening of the upper end face of the mandrel seat shell, and an alignment guide groove is arranged on the upper end face of the mandrel seat shell close to the bottom of the threaded guide groove. The core mold has a good switching effect, the external center rod is inconsistent with the thread of the core mold, the overall size of the core mold is reduced through switching of the upper core mold base threaded cylinder, alloy can be selected, polishing can be achieved, deformation is not prone to occurring, and the smoothness of the inner wall of a pipe body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to a mandrel seat capable of automatically adjusting concentricity. Background Technique

[0002] PTFE has excellent chemical resistance, high temperature resistance, and excellent surface smoothness, and is used more and more widely in various industries. At present, in the electronic industry, fluoroplastic tubes are mostly used for self-positioning assembly on automated equipment. In the medical industry, post-processing such as tip reaming process is required, and the concentricity requirements for fluoroplastic tubes are getting higher and higher. When molten fluoroplastic is extruded by an extruder, the uniformity of the gap between the mandrel and the die can be ensured by adjusting the positioning screws. Dispersed PTFE tubes cannot be processed by the form of melt extrusion, and the gap between its die mandrel cannot be adjusted by positioning screws. Generally, the concentricity is adjusted by the material pressure and the self-adjustment of the core die.

[0003] However, at present, the core die is generally made of soft materials such as PEEK, etc., and the core die swings to ensure high concentricity; long-term use will cause wear of the core die and a decrease in dimensional accuracy. There is a core die made of alloy material. Due to the hard material, the concentricity is mainly adjusted by the material pressure, and the effect is not ideal;

[0004] Secondly, the transition piece connecting the core die and the machine center rod is generally made of soft materials such as PA, PTFE, and copper, and has a slight deformation, which also plays a role in micro-adjusting the concentricity. Therefore, there is an urgent need for a mandrel seat capable of automatically adjusting concentricity to solve the above-mentioned existing problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a mandrel seat capable of automatically adjusting concentricity to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A mandrel seat capable of automatically adjusting concentricity, including a core die seat shell for support, a threaded guide groove for docking is opened at the opening of the upper end surface of the core die seat shell, and a positioning guide groove is opened at the bottom of the upper end surface of the core die seat shell near the threaded guide groove. A guide hole is opened through the bottom of the inner end surface of the core die seat shell to the outside.

[0007] A core die seat core, the core die seat core is slidably clamped on the inner end surface of the core die seat shell through the positioning guide groove;

[0008] A lower core die seat threaded cylinder, the lower core die seat threaded cylinder is threadedly connected with the core die seat shell through the threaded guide groove. A limiting rotating cylinder is arranged on the upper end surface of the lower core die seat threaded cylinder, and an upper core die seat threaded cylinder is arranged at the center of the upper end surface of the limiting rotating cylinder.

[0009] Preferably, the core mold base includes a centering chuck for support and guidance. A fixing cylinder is provided at the center of the lower end face of the centering chuck, and a hexagonal guide groove is formed at the center of the inner end face of the centering chuck. A threaded rotating groove is formed at the inner end face of the fixing cylinder near the bottom.

[0010] Preferably, the fixing cylinder is slidably clamped with the guide hole through the core mold housing, which can improve the accuracy of subsequent alignment of the fixing cylinder.

[0011] Preferably, the centering chuck is slidably clamped on the inner end face of the core mold housing through the centering guide groove, and a gap is provided between the side end face of the centering chuck and the centering guide groove. The centering guide groove has enough space to limit the centering chuck, which is convenient for subsequent precise adjustment of the centering angle of the centering chuck.

[0012] Preferably, the gap between the centering chuck and the centering guide groove is 0.1mm - 0.5mm. The gap between the centering chuck and the centering guide groove can facilitate the subsequent passage of materials through the filling gap, thereby providing sufficient lateral pressure for the centering chuck to complete the automatic centering and limiting of the centering chuck and the fixing cylinder.

[0013] Preferably, the core mold housing, the core mold base, the lower core mold threaded cylinder, the limiting rotating cylinder, and the upper core mold threaded cylinder are coaxially arranged, which can effectively improve the stability of subsequent PTFE paste extrusion and the accuracy of guidance.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model can select an alloy, can be polished, and is not easily deformed, improving the smoothness of the inner wall of the pipe.

[0016] 2. The present utility model can obtain a larger offset amount and has a better effect of correcting eccentricity.

[0017] 3. Different hardness core molds can be used for PTFE pipes with different wall thicknesses in the present utility model, reducing the loss of the mold.

[0018] 4. The present utility model has a good transfer function. The threads of the external center rod and the core mold are inconsistent, and are transferred through the upper core mold threaded cylinder, reducing the overall volume of the core mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded view of the main body of the present utility model;

[0020] Figure 2 is a structural schematic diagram of the main body of the present utility model;

[0021] Figure 3The front view of the main body of the present utility model;

[0022] Figure 4 The A - A cross-sectional view of the present utility model along the front view of the main body;

[0023] Figure 5 The partial enlarged view at I of the present utility model;

[0024] Figure 6 The structural schematic diagram of the core mold base core of the present utility model;

[0025] Figure 7 The side view of the core mold base core of the present utility model.

[0026] In the figure: 1 - upper core mold base threaded cylinder, 2 - core mold base core, 3 - threaded guide groove, 4 - alignment guide groove, 5 - core mold base shell, 6 - guide hole, 7 - lower core mold base threaded cylinder, 8 - limit rotating cylinder, 21 - hexagonal guide groove, 22 - threaded rotating groove, 23 - alignment chuck, 24 - fixed cylinder. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figure 1-7 , an embodiment provided by the present utility model: A core rod seat capable of automatically adjusting concentricity, including a core mold base shell 5 for support. At the opening of the upper end surface of the core mold base shell 5, a threaded guide groove 3 for docking is provided, and an alignment guide groove 4 is provided at the bottom of the upper end surface of the core mold base shell 5 near the threaded guide groove 3. A guide hole 6 is provided through the inner end surface bottom of the core mold base shell 5 to the outside.

[0029] The core mold base core 2, and the core mold base core 2 is slidably clamped on the inner end surface of the core mold base shell 5 through the alignment guide groove 4;

[0030] The lower core mold base threaded cylinder 7, the lower core mold base threaded cylinder 7 is threadedly connected to the core mold base shell 5 through the threaded guide groove 3, and a limit

[0031] rotating cylinder 8 is provided on the upper end surface of the lower core mold base threaded cylinder 7, and an upper core mold base threaded cylinder 1 is provided at the center of the upper end surface of the limit rotating cylinder 8.

[0032] The core die base core 2 includes an alignment chuck 23 for support and guidance. At the center of the lower end face of the alignment chuck 23, a fixing cylinder 24 is provided. And at the center of the inner end face of the alignment chuck 23, a hexagonal guide groove 21 is formed. At a position near the bottom of the inner end face of the fixing cylinder 24, a threaded rotating groove 22 is formed.

[0033] The fixing cylinder 24 is slidably clamped to the core die base shell 5 through the guide hole 6, which can improve the accuracy of subsequent alignment of the fixing cylinder 24.

[0034] The alignment chuck 23 is slidably clamped to the inner end face of the core die base shell 5 through the alignment guide groove 4. And there is a gap between the side end face of the alignment chuck 23 and the alignment guide groove 4. The alignment guide groove 4 has enough space to limit the alignment chuck 23, which is convenient for accurately regulating the centering angle of the alignment chuck 23 subsequently.

[0035] The gap between the alignment chuck 23 and the alignment guide groove 4 is 0.1mm - 0.5mm. The gap between the alignment chuck 23 and the alignment guide groove 4 can facilitate the subsequent passage of materials through the filling gap, thereby providing sufficient lateral pressure for the alignment chuck 23 to complete the automatic centering and limiting of the alignment chuck 23 and the fixing cylinder 24.

[0036] The core die base shell 5, the core die base core 2, the lower core die base threaded cylinder 7, the limiting rotating cylinder 8, and the upper core die base threaded cylinder 1 are coaxially arranged, which can effectively improve the stability of subsequent PTFE paste extrusion and the accuracy of guidance.

[0037] Working principle: When in use, the upper core die base threaded cylinder 1 on the upper part of the limiting rotating cylinder 8 is connected to the center rod, and the lower core die base threaded cylinder 7 at the lower part of the limiting rotating cylinder 8 is connected to the core die base shell 5. The alignment guide groove 4 is arranged inside the core die base shell 5. The fixing cylinder 24 can move inside the alignment guide groove 4 through the alignment chuck 23. During the actual extrusion process, the alignment chuck 23 moves inside the alignment guide groove 4. At the same time, since there is a distance between the side wall of the alignment chuck 23 and the alignment guide groove 4, the alignment chuck 23 is centrally extruded towards the middle under the pressure of the material, thereby driving the fixing cylinder 24 and the alignment chuck 23 to be centered synchronously, improving the concentricity of the pipe.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A core rod holder capable of automatically adjusting concentricity, comprising a core mold holder shell (5) for supporting, a threaded guide groove (3) for docking is provided at an opening of the upper end surface of the core mold holder shell (5), and a positioning guide groove (4) is provided at the bottom of the upper end surface of the core mold holder shell (5) near the threaded guide groove (3), and a guide hole (6) is provided at the bottom of the inner end surface of the core mold holder shell (5) through to the outside, characterized in that: A core mold seat core (2), the core mold seat core (2) is slidably engaged with the inner end surface of the core mold seat shell (5) through the alignment guide groove (4); A lower core mold seat threaded barrel (7), the lower core mold seat threaded barrel (7) is threadedly connected to the core mold seat shell (5) through the threaded guide groove (3), a limiting rotating barrel (8) is arranged on the upper end surface of the lower core mold seat threaded barrel (7), and an upper core mold seat threaded barrel (1) is arranged at the center of the upper end surface of the limiting rotating barrel (8).

2. The mandrel holder capable of automatically adjusting concentricity according to claim 1, characterized in that: The core mold seat core (2) comprises an alignment chuck (23) for support and guidance, a fixing cylinder (24) is arranged at the center of the lower end surface of the alignment chuck (23), a hexagonal guide groove (21) is opened at the center of the inner end surface of the alignment chuck (23), and a threaded groove (22) is opened at the inner end surface of the fixing cylinder (24) near the bottom.

3. The mandrel holder capable of automatically adjusting concentricity according to claim 2, characterized in that: The fixing cylinder (24) is slidably engaged with the core mold base shell (5) through the guide hole (6).

4. The mandrel holder capable of automatically adjusting concentricity according to claim 2, characterized in that: The alignment chuck (23) is slidably engaged with the inner end surface of the core mold base shell (5) through the alignment guide groove (4), and a gap is provided between the side end surface of the alignment chuck (23) and the alignment guide groove (4).

5. The mandrel holder capable of automatically adjusting concentricity according to claim 2, characterized in that: The gap between the alignment chuck (23) and the alignment guide groove (4) is 0.1 mm-0.5 mm.

6. The mandrel holder capable of automatically adjusting concentricity according to claim 2, characterized in that: The core mold seat shell (5), the core mold seat core (2), the lower core mold seat threaded cylinder (7), the limiting rotating cylinder (8) and the upper core mold seat threaded cylinder (1) are coaxially arranged.

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