Round tube hydrophone filling mold

Abstract

The invention provides a circular tube hydrophone filling mold which comprises a shaping tube, a base, a positioning piece, a positioning end cap, a positioning rod and a circular tube hydrophone, the base is connected to the bottom of the shaping tube in a sleeving mode, and the positioning piece is installed on the base and connected with the bottom of the circular tube hydrophone; the positioning end cap is connected to the outer diameter of the top of the shaping tube in a sleeving manner, the positioning rod is mounted on the positioning end cap, and the positioning rod is connected with the center of the top of the circular tube hydrophone in a positioning manner; gaps are reserved between the circular tube hydrophone and the inner wall of the shaping tube and between the bottom of the circular tube hydrophone and the upper surface of the positioning piece to form filling cavities, and a watertight layer is formed after filling. Through material optimization and structural design of the pouring mold, the pouring process of the hydrophone has the advantages of being low in cost, easy and convenient to operate, stable in process and the like. Through the structural design, the performance of the circular tube hydrophone becomes more stable, the perfusion positioning is more accurate, the perfusion demolding process of the hydrophone is greatly simplified, and the perfusion layer of the hydrophone is more beautiful.

Description

Technical Field

[0001] The invention relates to the technical field of a casting mould for a hydrophone outer watertight layer, and mainly relates to a casting mould for a round tube hydrophone. Background Art

[0002] As a key device for picking up underwater acoustic signals, the development of hydrophone technology is of great significance to the overall performance improvement of sonar systems. As the core sensitive component of the commonly used circular tube hydrophone, the strength of the piezoelectric circular tube and the surface bubbles of its infusion layer will directly affect the performance parameters of the hydrophone. The thickness of the infusion layer of the thin-diameter circular tube hydrophone is generally thin (0.5mm to 4mm thick). The traditional infusion method is to use metal or polytetrafluoroethylene to process into an infusion mold. The overall structure design adopts two semicircular Havers. A release agent is applied before use so that the resin can be demolded after curing. The characteristics of the release agent itself, the finish of the mold and the dimensional tolerance will cause the outer surface of the infusion layer to be rough, the thickness is uneven, and bubbles and other defects cannot be discharged. During the assembly of the hydrophone vibrator, the piezoelectric circular tube is easy to touch the release agent on the infusion mold, resulting in a loose bond between the infusion layer and the vibrator. After the watertight layer is cured, it is brittle and easy to crack, resulting in a sharp increase in the difficulty of demolding. It is based on this background that the present invention designs a infusion mold according to the performance characteristics of the circular tube hydrophone. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a round tube hydrophone casting mold.

[0004] The objective of the present invention is achieved through the following technical solutions: A circular tube hydrophone pouring mold, comprising a shaping tube, a base, a positioning piece, a positioning end cap, a positioning rod and a circular tube hydrophone, wherein the base is sleeved at the bottom of the shaping tube, the positioning piece is installed on the base and is centrally positioned and connected with the bottom of the circular tube hydrophone; the positioning end cap is sleeved at the top outer diameter of the shaping tube, the positioning end cap is installed with a positioning rod, and the positioning rod is centrally positioned and connected with the top of the circular tube hydrophone; a gap is left between the circular tube hydrophone and the inner wall of the shaping tube, and between the bottom of the circular tube hydrophone and the upper surface of the positioning piece to form a pouring cavity, and a watertight layer is formed after pouring.

[0005] Furthermore, a center hole is provided at the center position of the positioning piece, and a pin B matching with the center hole is provided at the bottom of the circular tube hydrophone; a through hole is also provided on the positioning piece, and a pin A matching with the through hole is provided at the bottom of the circular tube hydrophone, and the thickness of the bottom of the watertight layer is controlled by adjusting the thickness of the positioning piece and the length of the pin.

[0006] Furthermore, an upper boss plugged into the positioning hole of the positioning rod is provided on the top of the circular tube hydrophone, and the thickness of the watertight layer on the top of the circular tube hydrophone is controlled by limiting the height of the upper boss.

[0007] Furthermore, the outer diameter of the step of the base is the same as the inner diameter of the shaping tube, and is used for connecting and positioning the shaping tube.

[0008] Furthermore, the shaping tube is a round tube with two openings and smooth inner and outer surfaces, and the material of the round tube is a colorless and transparent plastic material that is not compatible with the watertight layer.

[0009] Furthermore, the plastic material includes polypropylene, polyvinyl chloride, polymethyl methacrylate, dimethyl terephthalate or polyimide material.

[0010] Furthermore, the positioning rod and the positioning sheet are made of polytetrafluoroethylene, polypropylene or polymethyl methacrylate.

[0011] Furthermore, the positioning end cap is made of metal material and is used to fix the shaping tube.

[0012] The beneficial effects of the present invention are:

[0013] 1. The present invention adopts a plastic round tube as the shaping structure of the watertight layer (infusion layer). Due to the natural incompatibility between the watertight layer and the material, no release agent is required on the mold, and the material is not easy to deform, so it can also meet the curing requirements of the watertight layer at room temperature (25°C) or higher temperatures. After the watertight layer is cured, the material can be demoulded by cutting or tearing. Since the strength of the watertight layer and the plastic material after curing is quite different, the demoulding process is more convenient and will not damage the infusion layer. The round tube is used as a disposable consumable and will not affect the next infusion. In addition, since the plastic material is colorless and transparent, it can be used as a infusion mold to observe the flow state of the infusion watertight layer in real time, and defects in the infusion can be discovered in time and remedial measures can be taken in time. The improvement of the degree of visualization greatly improves the yield rate and efficiency of the hydrophone infusion.

[0014] 2. The upper and lower positioning structures adopt a positioning structure that combines metal and plastic materials, which can not only ensure the rigidity of positioning, but also ensure that the plastic material has a certain degree of adhesion with the watertight layer. However, due to the small contact area, the demoulding of the upper and lower positioning structures also becomes simple, and the upper and lower positioning structures can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art or ordinary technicians, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0017] Figure 2 Before perfusion Figure 1 AA section view.

[0018] Figure 3 After perfusion Figure 1 AA section view.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 5 This is a schematic diagram of the main structure of the present invention without the positioning end cap and before pouring.

[0021] Figure 6 for Figure 5 BB cross-sectional view.

[0022] Figure 7 It is a schematic diagram of the cross-sectional structure of the present invention after the positioning end cap is removed and the injection is performed.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the present invention without the positioning end cap and before pouring.

[0024] Fig. 9 It is a left-side structural schematic diagram of the circular tube hydrophone part of the present invention.

[0025] Fig.10 It is a schematic diagram of the three-dimensional structure of the circular tube hydrophone part of the present invention.

[0026] Fig.11 It is a schematic diagram of the structure of the cooperation between the circular tube hydrophone part and the positioning piece of the present invention.

[0027] Explanation of the accompanying drawings: shaping tube 1, base 2, positioning plate 3, center hole 3-1, positioning end cap 4, positioning rod 5, positioning hole 5-1, circular tube hydrophone 6, upper boss 6-1, pin A 6-2, pin B 6-3, watertight layer 7, perfusion cavity 8. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0029] The present invention mainly solves the problems of injection, positioning and demoulding of the outer watertight layer (polyurethane and epoxy resin) of a circular tube hydrophone. When ordinary metal molds and polytetrafluoroethylene molds are injected into the watertight layer, an oily release agent needs to be coated on the mold surface. The uneven coating and fluidity of the release agent will leave marks on the surface of the resin material after solidification, which greatly increases the difficulty of the demoulding process of the circular tube hydrophone and makes the surface of the injection layer rough and defective. When ordinary metal molds and polytetrafluoroethylene molds are injected, the flow of the watertight layer cannot be observed in real time, and bubbles or other defects cannot be detected in time.

[0030] The present invention proposes a round tube hydrophone pouring mold, which is mainly used for pouring the outer watertight layer of the hydrophone. Through the material optimization and structural design of the pouring mold, the pouring process of the hydrophone has the advantages of low cost, simple operation, stable process, etc. Through this structural design, the performance of the round tube hydrophone becomes more stable, the pouring positioning becomes more accurate, the pouring demoulding process of the hydrophone is greatly simplified, and the pouring layer of the hydrophone becomes more beautiful.

[0031] like Figure 1-11 As shown, the circular tube hydrophone casting mold includes a shaping tube 1, a base 2, a positioning piece 3, a positioning end cap 4, a positioning rod 5 and a circular tube hydrophone 6.

[0032] In the present invention, the shaping tube 1 is a round tube with two open ends and smooth inner and outer surfaces. The material of the round tube is a colorless and transparent plastic material that is not compatible with the watertight layer. Generally, polypropylene, polyvinyl chloride (PVC), polymethyl methacrylate, dimethyl terephthalate or polyimide material is used, with an inner diameter of 14 mm and an outer diameter of 15 mm. Since the plastic material is colorless and transparent, it can be used as a pouring mold to observe the flow state of the poured watertight layer in real time, and defects in the pouring can be discovered in time and remedial measures can be taken in time. The improvement of the visualization degree greatly improves the yield rate and pouring efficiency of the hydrophone pouring.

[0033] In the present invention, the base 2 is made of metal material, generally 304 stainless steel, 45 steel, aluminum alloy, with an outer diameter of 14 mm at the step, which is the same as the inner diameter of the shaping tube 1, and is used to connect and position the shaping tube 1.

[0034] In the present invention, the positioning piece 3 is made of 4mm thick polytetrafluoroethylene material, and the positioning piece 3 is designed with two holes with a diameter of 1mm (center hole 3-1 and through hole). The center hole 3-1 is provided at the center of the positioning piece 3, and the bottom of the circular tube hydrophone 6 is provided with a pin B 6-3 that matches the center hole 3-1; the positioning piece 3 is also provided with a through hole, and the bottom of the circular tube hydrophone 6 is also provided with a pin A6-2 that matches the through hole, which is used to position the circular tube hydrophone 6 in the center. Specifically, the positioning piece 3 is installed on the base 2 and is connected to the bottom of the circular tube hydrophone 6 in the center. The thickness of the bottom of the watertight layer 7 is controlled by adjusting the thickness of the positioning piece 3 and the length of the pin.

[0035] In the present invention, the positioning end cap 4 is made of metal material, generally 304 stainless steel, 45 steel, aluminum alloy, with an inner diameter of 15 mm, used to clamp the outer diameter of the positioning tube 1; there is a 4 mm diameter hole at the center of the bottom for fixing the shaping tube 1.

[0036] In the present invention, the top of the circular tube hydrophone 6 is provided with an upper boss 6-1 plugged into the positioning hole 5-1, and the thickness of the watertight layer 7 on the top of the circular tube hydrophone 3 is controlled by limiting the height of the upper boss 6-1 (2mm boss). During pouring, the positioning end cap 4 and the positioning rod 5 are removed first, and the free surface is poured. As long as the top thickness exceeds the upper boss 6-1, when the pouring exceeds the required pouring thickness, the positioning end cap 4 and the positioning rod 5 are installed to keep the circular tube hydrophone 6 concentric with the shaped tube 1, and the top pouring thickness is ensured by turning and grinding in the later stage.

[0037] In the present invention, the positioning rod 5 is made of polytetrafluoroethylene material, dimethyl terephthalate or polyimide material, with an outer diameter of 4 mm, and positioning holes 5-1 with a diameter of Φ2 mm are designed at both ends. The positioning rod 5 is connected to the upper boss 6-1 of the circular tube hydrophone 6 through the positioning end cap 4 and the positioning rod 5, and is used to locate the center of the circular tube hydrophone 6.

[0038] In the present invention, gaps are left between the circular tube hydrophone 6 and the inner wall of the shaping tube 1 , and between the bottom of the circular tube hydrophone 6 and the upper surface of the positioning piece 3 to form a perfusion cavity 8 , and a watertight layer 7 is formed after perfusion.

[0039] In the present invention, a round tube made of a plastic material that is not compatible with the watertight layer is used as the main part of the injection mold. The positioning structure design of the injection mold and the upper and lower positioning parts are both a combination of plastic and metal.

[0040] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A round tube hydrophone casting mold, characterized in that: The invention comprises a shaping tube (1), a base (2), a positioning piece (3), a positioning end cap (4), a positioning rod (5) and a circular tube hydrophone (6); the base (2) is sleeved at the bottom of the shaping tube (1); the positioning piece (3) is mounted on the base (2) and is centrally connected to the bottom of the circular tube hydrophone (6); the positioning end cap (4) is sleeved at the top outer diameter of the shaping tube (1); a positioning rod (5) is mounted on the positioning end cap (4); the positioning rod (5) is centrally connected to the top of the circular tube hydrophone (6); gaps are left between the circular tube hydrophone (6) and the inner wall of the shaping tube (1), and between the bottom of the circular tube hydrophone (6) and the upper surface of the positioning piece (3) to form a perfusion cavity (8); after perfusion, a watertight layer (7) is formed.

2. The round tube hydrophone casting mold according to claim 1, characterized in that: The positioning piece (3) is provided with a center hole (3-1) at the center position, and the bottom of the circular tube hydrophone (6) is provided with a pin B (6-3) that matches the center hole (3-1); the positioning piece (3) is also provided with a through hole, and the bottom of the circular tube hydrophone (6) is provided with a pin A (6-2) that matches the through hole, and the thickness of the bottom of the watertight layer (7) is controlled by adjusting the thickness of the positioning piece (3) and the length of the pin.

3. The round tube hydrophone casting mold according to claim 2, characterized in that: An upper boss (6-1) plugged into a positioning hole (5-1) of a positioning rod (5) is provided on the top of the circular tube hydrophone (6), and the thickness of a watertight layer (7) on the top of the circular tube hydrophone (3) is controlled by limiting the height of the upper boss (6-1).

4. The round tube hydrophone casting mold according to claim 3, characterized in that: The outer diameter of the step of the base (2) is the same as the inner diameter of the shaped tube (1), and is used for connecting and positioning the shaped tube (1).

5. The round tube hydrophone casting mold according to claim 4, characterized in that: The shaped tube (1) is a round tube with two open ends and smooth inner and outer surfaces. The material of the round tube is a colorless and transparent plastic material that is not compatible with the watertight layer.

6. The round tube hydrophone casting mold according to claim 5, characterized in that: The plastic material includes polypropylene, polyvinyl chloride, polymethyl methacrylate, dimethyl terephthalate or polyimide material.

7. The round tube hydrophone casting mold according to claim 6, characterized in that: The positioning rod (5) and the positioning plate (3) are made of polytetrafluoroethylene, polypropylene or polymethyl methacrylate.

8. The round tube hydrophone casting mold according to claim 7, characterized in that: The positioning end cap (4) is made of metal material and is used to fix the shaping tube (1).

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