Mould for vulcanizing liquid rubber coated disc transducer and vulcanizing process

Abstract

The invention discloses a special mold for vulcanizing a liquid rubber coated disc transducer and a vulcanizing process, and belongs to the field of rubber vulcanization. The die comprises an upper half-range vulcanization die and a lower half-range vulcanization die, and through a vulcanization process method of respective vulcanization of the upper half-range and the lower half-range, the deviation of the disc transducer in the vulcanization process is avoided, and the defect that the surface needs to be repaired and filled in the existing vulcanization process is also avoided. Meanwhile, operation is easy, the product percent of pass is increased, the product service life is prolonged, and good market application prospects are achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid rubber vulcanization, and relates to a mold for vulcanization of a liquid rubber coated disc transducer and a vulcanization process. BACKGROUND

[0002] The transducer is a core component for realizing sound-electricity conversion and is widely applied to underwater detection, communication, navigation and ocean resource exploration fields. The complex underwater environment puts forward higher requirements for the performance, reliability and pressure resistance and sealing performance of the transducer, so the liquid rubber needs to be coated on the outside of the transducer to prevent the transducer from being damaged.

[0003] The liquid rubber coated transducer is realized through a vulcanization process, and the integrity of the surface of the liquid rubber coated transducer determines the pressure resistance and sealing performance of the transducer. Therefore, the integrity of the surface of the liquid rubber coated transducer is very important. At present, the method for vulcanization of the liquid rubber coated disc transducer mostly adopts the method of placing a support such as a cushion block or a support under the transducer, taking out the support after vulcanization, and then filling the defects. This method of filling defects greatly depends on the skill level of the operator, has low operation reliability and low efficiency; the part filled with defects has poor surface integrity because it is not formed by one-time vulcanization with the body, so that the service life of the transducer is reduced; and in the vulcanization process, the transducer cannot be fixed in the coating layer and will be offset, resulting in a low product qualification rate. SUMMARY

[0004] The application aims to solve the problems in the prior art, such as the fact that the disc transducer cannot be fixed in the coating layer, the poor surface integrity, the low product qualification rate, the low service life and the low production efficiency in the vulcanization process of the liquid rubber coated disc transducer, and provides a mold for vulcanization of a liquid rubber coated disc transducer and a vulcanization process. The process avoids the problems of secondary filling of defects and the inability to fix the position of the transducer, greatly improves the product qualification rate and service life, and has a simple operation process, thereby improving the production efficiency.

[0005] The application aims to solve the problems in the prior art, such as the fact that the disc transducer cannot be fixed in the coating layer, the poor surface integrity, the low product qualification rate, the low service life and the low production efficiency in the vulcanization process of the liquid rubber coated disc transducer, and provides a mold for vulcanization of a liquid rubber coated disc transducer and a vulcanization process. The process avoids the problems of secondary filling of defects and the inability to fix the position of the transducer, greatly improves the product qualification rate and service life, and has a simple operation process, thereby improving the production efficiency. The middle frame of the upper half vulcanization mold is provided with a through opening with a diameter slightly larger than the diameter of the disc transducer in the middle part, and a wire slot capable of accommodating the cable of the disc transducer is formed on the surface of the middle frame, the wire slot extending from the edge of the through opening to the outer edge of the middle frame, a plurality of columns uniformly distributed are inlaid on the surface of the middle frame, and the columns are respectively located at the outer periphery of the through opening, and the thickness of the middle frame is half of the thickness of the disc transducer. The lower bottom surface of the upper half vulcanization mold is provided with a wire slot capable of accommodating the welding spot on the disc transducer and the cable connected with the welding spot, and the wire slot extends from the inner side of the wire slot of the middle frame to the center of the through opening, and the wire slot of the middle frame is on the same axis with the wire slot of the middle frame, The upper mold of the upper half vulcanization mold is provided with a through opening in the middle part of the upper mold, and the shape of the through opening is the appearance shape of the disc transducer product coated by the liquid rubber. The diameter of the through opening is larger than the diameter of the through opening in the middle part of the middle frame. The recesses corresponding to the cylinders of the middle frame are uniformly arranged on the periphery of the through opening. The cylinders of the middle frame are inserted into the recesses of the upper mold when the middle frame is combined with the upper mold. The half-cone-shaped slot for collecting the cable head of the disc transducer outward is arranged on the surface of the upper mold. The conical bottom of the half-cone-shaped slot faces the through opening, and the conical tip of the half-cone-shaped slot faces the edge of the upper mold. The thickness of the upper mold is half of the thickness of the disc transducer product coated by the liquid rubber. The middle frame of the lower half vulcanization mold is provided with a through opening in the middle part of the middle frame. The diameter of the through opening is the same as the diameter of the through opening of the upper mold of the upper half vulcanization mold. The recesses are uniformly arranged on the periphery of the through opening. The half-cone-shaped slot for collecting the cable head of the disc transducer outward is arranged on the surface of the middle frame. The conical bottom of the half-cone-shaped slot faces the through opening, and the conical tip of the half-cone-shaped slot faces the edge of the middle frame. The half-cone-shaped slot corresponds to the half-cone-shaped slot of the upper mold of the upper half vulcanization mold. The thickness of the middle frame is half of the thickness of the disc transducer product coated by the liquid rubber. The lower bottom of the lower half vulcanization mold is inlaid with a plurality of cylinders corresponding to the recesses of the middle frame. The cylinders of the lower bottom are inserted into the recesses of the middle frame when the middle frame is combined with the lower bottom. The middle part of the upper mold of the lower half vulcanization mold is provided with a through opening in the shape of the appearance shape of the disc transducer product coated by the liquid rubber. The diameter of the through opening is the same as the diameter of the through opening of the middle frame. The recesses corresponding to the cylinders of the lower bottom are uniformly arranged on the periphery of the through opening.

[0006] The wire slot on the lower bottom surface of the upper half vulcanization mold is composed of a welding spot wire slot and a cable wire slot. When the lower bottom is combined with the middle frame, the cable wire slot of the lower bottom is connected with the wire slot of the middle frame. The welding spot wire slot of the lower bottom is located at one end of the cable wire slot extending to the center of the through opening.

[0007] A vulcanization process of the liquid rubber-coated disc transducer vulcanization mold, characterized in that it comprises the following steps: (1) Upper half vulcanization After preheating the upper half vulcanization mold, the welding spot and the cable of the disc transducer are aligned with the wire slot on the lower bottom. Then the cable is placed in the wire slot and the half-cone-shaped slot reserved in the middle frame and the upper mold. The upper mold, the middle frame and the lower bottom are combined. The liquid rubber which has been mixed uniformly and vacuum degassed is slowly poured into the mold. After the liquid rubber fills the mold, the upper half vulcanization mold is placed in the oven for vulcanization. After vulcanization, the upper half vulcanization product is taken out for lower half vulcanization. (II) lower half vulcanization Put the vulcanized upper half product on the lower bottom of the lower half vulcanization mold, the cylindrical hole formed by the outer periphery of the upper half product is fixed on the cylinder of the lower bottom of the lower half vulcanization mold respectively, and the lower bottom is positioned and fixed by using a plurality of cylinders thereon, then the middle frame and the upper mold are combined with the lower bottom in turn, the liquid rubber after being uniformly mixed and vacuum degassed is slowly poured into the mold, the liquid rubber is filled in the mold, then the lower half vulcanization mold is put into the oven for vulcanization, after vulcanization, the product is taken out, and a liquid rubber coated disc transducer product with complete surface and no defects is obtained.

[0008] The beneficial effects of the present application are: 1. The method of vulcanizing the upper and lower halves of the mold respectively, which is different from the traditional method of using a cushion or support to prevent defects from occurring, does not require secondary filling, and significantly improves the service life and production efficiency of the product.

[0009] 2. By designing the mold, the disc transducer can be accurately coated in the center of the liquid rubber, and the product pass rate is high.

[0010] 3. Through the mold design and preparation method, the vulcanization operation of the liquid rubber coated disc transducer is simple and convenient, and the product pass rate is high. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The upper half vulcanization mold of the present application.

[0012] Figure 2 The lower bottom of the upper half vulcanization mold of the present application.

[0013] Figure 3 The middle frame of the upper half vulcanization mold of the present application.

[0014] Figure 4 The upper mold of the upper half vulcanization mold of the present application.

[0015] Figure 5 The lower half vulcanization mold of the present application.

[0016] Figure 6 The lower bottom of the lower half vulcanization mold of the present application.

[0017] Figure 7 The middle frame of the lower half vulcanization mold of the present application.

[0018] Figure 8 The upper mold of the lower half vulcanization mold of the present application.

[0019] Among them: 11 - disc transducer, 12 - liquid rubber, 13 - upper half of the mold on the mold, 14 - upper half of the mold on the frame, 15 - upper half of the mold on the bottom, 21 - semicircular wire slot, 22 - sink hole, 31 - cylinder, 32 - semicircular wire slot, 33 - via, 41 - semicircular conical wire slot, 42 - via, 51 - disc transducer, 52 - liquid rubber, 53 - lower half of the mold on the mold, 54 - lower half of the mold on the frame, 55 - lower half of the mold on the bottom, 61 - sink hole, 71 - semicircular conical wire slot, 72 - via, 81 - semicircular wire slot, 82 - via. DETAILED DESCRIPTION

[0020] In order to make the structure and effect of the present application more clearly, the present application is further described in conjunction with the drawings and specific examples. EXAMPLE

[0021] A liquid rubber coated disc transducer vulcanization mold, comprising an upper half of the mold and a lower half of the mold, wherein: the upper half of the mold comprises a bottom 15, a frame 14 and an upper mold 13 which are mutually combined from bottom to top, four outer corners of the upper mold 13 and the frame 14 of the upper half of the mold are respectively provided with vias 42 and 33, and the outer corners of the bottom 15 are respectively provided with four sink holes 22, the upper mold 13, the frame 14 and the bottom 15 of the upper half of the mold are combined, and are fixed by screwing a via screw into the via and the sink hole; The thickness of the frame 14 of the upper half of the mold is half of the thickness of the disc transducer 11, a through opening with a diameter slightly larger than the diameter of the disc transducer 11 is provided in the middle of the frame 14, a wire slot 32 with a semicircular cross section capable of accommodating the cable of the disc transducer 11 is provided on the surface of the frame 14, the wire slot 32 extends from the edge of the through opening to the outer edge of the frame 14, and according to the product shape requirement, a plurality of cylinders 31 are embedded on the surface of the frame 14, and in this embodiment, four cylinders 31 are uniformly distributed according to the product requirement, and the cylinders 31 are respectively located at the outer periphery of the through opening; A wire slot 21 with a semicircular cross section capable of accommodating the welding point on the disc transducer 11 and the cable connected to the welding point is provided on the surface of the bottom 15 of the upper half of the mold, the wire slot 21 is composed of a welding point wire slot and a cable wire slot, when the bottom 15 and the frame 14 are combined, the wire slot 21 is located on the inner side of the through opening of the frame 14, and is on the same axis as the semicircular wire slot 32 of the frame 14, and the welding point wire slot is located at one end of the cable wire slot extending to the center of the through opening; The upper half of the vulcanization mold is provided with an upper mold 13 with a thickness of half of the thickness of the liquid rubber coated disc transducer 11 product, and a through opening with the shape of the appearance of the liquid rubber coated disc transducer 11 product is formed in the middle of the upper mold 13, the diameter of the through opening is larger than the diameter of the through opening in the middle of the middle frame 14, four grooves corresponding to the middle frame cylinders 31 are uniformly formed around the periphery of the through opening, the middle frame 14 is combined with the upper mold 13, and the four cylinders 31 of the middle frame are respectively inserted into the four grooves of the upper mold 13, a half-circular conical groove 41 with a cross section for collecting the cable head of the disc transducer 11 outward is formed on the surface of the upper mold 13 along the radial direction of the through opening, the conical bottom of the groove faces the through opening, and the conical tip faces the edge of the upper mold; The lower half of the vulcanization mold is provided with a lower bottom 55, a middle frame 54 and an upper mold 53 combined from bottom to top, four through holes 82 and 72 are respectively formed in the outer corners of the upper mold 53 and the middle frame 54, and four sunken holes 61 are respectively formed in the outer corners of the lower bottom 55, the upper mold 53, the middle frame 54 and the lower bottom 55 are combined, and are fixed by screwing through hole screws into the through holes and the sunken holes; The lower half of the vulcanization mold is provided with a lower bottom 55, a middle frame 54 and an upper mold 53 combined from bottom to top, four through holes 82 and 72 are respectively formed in the outer corners of the upper mold 53 and the middle frame 54, and four sunken holes 61 are respectively formed in the outer corners of the lower bottom 55, the upper mold 53, the middle frame 54 and the lower bottom 55 are combined, and are fixed by screwing through hole screws into the through holes and the sunken holes; The thickness of the middle frame 54 is half of the thickness of the liquid rubber coated disc transducer 51 product, a through opening is formed in the middle of the middle frame 54, the diameter of the through opening is the same as the diameter of the through opening of the upper mold 13 of the upper half of the vulcanization mold, grooves corresponding to the cylinders of the lower bottom 55 are uniformly formed around the periphery of the through opening, the grooves are in communication with the through opening, the middle frame 54 is combined with the lower bottom 55, the cylinders of the lower bottom 55 are inserted into the grooves of the middle frame 54, a half-circular conical groove 71 with a cross section for collecting the cable head of the disc transducer 51 outward is formed on the surface of the middle frame 55 along the radial direction of the through opening, the conical groove 71 faces the through opening with its conical bottom, and faces the edge of the middle frame with its conical tip, the half-circular conical groove 71 corresponds to the half-circular conical groove 41 of the upper mold 13 of the upper half of the vulcanization mold, The lower half of the vulcanization mold is provided with a lower bottom 55, a middle frame 54 and an upper mold 53 combined from bottom to top, four through holes 82 and 72 are respectively formed in the outer corners of the upper mold 53 and the middle frame 54, and four sunken holes 61 are respectively formed in the outer corners of the lower bottom 55, the upper mold 53, the middle frame 54 and the lower bottom 55 are combined, and are fixed by screwing through hole screws into the through holes and the sunken holes;

[0022] A vulcanization process of the liquid rubber coated disc transducer vulcanization mold, comprising the following steps: (1) Upper half vulcanization After preheating the upper half vulcanization mold, the welding points of the disc transducer 11 are aligned with the semicircular wire grooves 21 on the lower base 15, and then the cable is placed in the semicircular wire grooves 32 and the semicircular conical grooves 41 reserved in the middle frame 14 and the upper mold 13. After the upper mold 13, the middle frame 14 and the lower base 15 are combined, the liquid rubber 12 which has been mixed uniformly and vacuum degassed is slowly poured into the mold. After the liquid rubber 12 fills the mold, the upper half vulcanization mold is placed in the oven for vulcanization. After vulcanization, the upper half vulcanization product is taken out for the lower half vulcanization. (II) Lower half vulcanization The vulcanized upper half vulcanization product 51 is placed on the lower base 55 of the lower half vulcanization mold. The four cylindrical holes formed on the outer periphery of the upper half vulcanization product are fixed on the cylinders of the lower base of the lower half vulcanization mold. The four cylinders on the lower base 55 are used for positioning and fixing. Then the middle frame 54 and the upper mold 53 are combined with the lower base in turn. The liquid rubber 52 which has been mixed uniformly and vacuum degassed is slowly poured into the mold. After the liquid rubber fills the mold, the lower half vulcanization mold is placed in the oven for vulcanization. After vulcanization, the product is taken out, and a liquid rubber coated disc transducer product with complete surface and no defects is obtained.

[0023] Comparative example: The traditional liquid rubber coated disc transducer vulcanization method is used, that is: The cushion is placed in the mold, and the disc transducer is placed on the cushion or support, keeping it suspended. After the liquid rubber is poured into the mold, vulcanization is carried out. After vulcanization, the product is taken out, and the cushion embedded at the bottom of the product is taken out. The part occupied by the cushion or support forms a gap, which needs to be repaired twice. The gap is polished, the vulcanized disc transducer gap is placed in the mold with the gap upwards, liquid rubber is poured into the gap for vulcanization, and a liquid rubber coated disc transducer product is obtained after vulcanization.

[0024] Through dissection of the product, it is found that the disc transducer coated in the example is always in the central position of the product, while the cushion or support in the comparative example cannot guarantee that the transducer does not shift during vulcanization, so it is easy to cause the coated disc transducer to be not in the center of the product and to shift. Through further dissection of the product, it is found that there are gaps and defects in the gap of the twice vulcanized product in the comparative example, while the example product has no defects. Therefore, it can be seen that the liquid rubber coated disc transducer product prepared by the present application has good performance.

[0025] Finally, it should be noted that the above examples are only used to illustrate the present application and do not limit the technical solutions described in the present application. Those skilled in the art should understand that many modifications can still be made to the present application. All modifications directly derived from or inferred from the content disclosed in the present application should be considered as falling within the scope of protection of the present application.

Claims

1. A vulcanizing mold for a liquid rubber-coated disc transducer, characterized in that: It includes an upper vulcanizing mold and a lower vulcanizing mold, wherein the upper vulcanizing mold and the lower vulcanizing mold each include a lower base, a middle frame, and an upper mold. The upper half of the vulcanizing mold has a through opening in its middle frame, with a diameter slightly larger than that of the disc transducer. A cable groove, capable of accommodating the disc transducer's cables, is formed on the surface of the middle frame, extending from the edge of the through opening to the outer edge of the middle frame. Several evenly distributed cylinders are embedded in the surface of the middle frame, each located around the outer perimeter of the through opening. The thickness of the middle frame is half the thickness of the disc transducer. The lower surface of the upper half of the vulcanizing mold has a groove for accommodating the solder joints on the disc transducer and the cables connected to the solder joints. The lower bottom is closed with the middle frame. The groove extends from the inside of the groove in the middle frame towards the center of the through opening and is on the same axis as the groove in the middle frame. The upper half of the vulcanizing mold has a through-hole in the center of its upper mold, shaped like the liquid rubber-coated disc transducer product. The diameter of this through-hole is larger than the diameter of the through-hole in the middle of the middle frame. Grooves corresponding to the cylinders of the middle frame are evenly distributed around the through-hole. The middle frame and the upper mold are closed, with the cylinders of the middle frame inserted into the grooves of the upper mold. A semi-conical groove, tapering outwards, is formed on the surface of the upper mold for covering the cable head of the disc transducer. The bottom of the groove faces the through-hole, and the tip faces the edge of the upper mold. The thickness of the upper mold is half the thickness of the liquid rubber-coated disc transducer product. A through-opening is formed in the middle of the lower half of the vulcanizing mold, with the same diameter as the through-opening diameter of the upper half of the vulcanizing mold. Grooves are evenly distributed around the perimeter of the through-opening. A semi-conical groove, tapering outwards, is formed on the surface of the middle frame to cover the cable end of the disc transducer. The bottom of the groove faces the through-opening, and the tip faces the edge of the middle frame. This semi-conical groove corresponds to the semi-conical groove in the upper half of the vulcanizing mold. The thickness of the middle frame is half the thickness of the liquid rubber-coated disc transducer product. The lower half of the vulcanizing mold has several evenly distributed cylinders embedded in its bottom, corresponding to the grooves in the middle frame. When the middle frame and the bottom are closed, the cylinders on the bottom are inserted into the grooves in the middle frame. The upper part of the lower half vulcanizing mold has a through opening in the middle, which is shaped like the appearance of a liquid rubber-coated disc transducer product. The diameter of the through opening is the same as the diameter of the through opening in the middle frame. Grooves corresponding to the bottom cylinder are evenly distributed around the through opening.

2. The vulcanizing mold for the liquid rubber-coated disc transducer according to claim 1, characterized in that: The groove on the lower surface of the upper half vulcanizing mold is composed of a welding point groove and a cable groove. When the lower bottom and the middle frame are closed, the cable groove of the lower bottom is connected to the groove of the middle frame. The welding point groove of the lower bottom is located at the end of the cable groove extending towards the center of the through opening.

3. A vulcanization process for a vulcanization mold of a liquid rubber-coated disc transducer as described in claim 1 or 2, characterized in that, Includes the following steps: (a) Upper half vulcanization After preheating the upper half of the vulcanizing mold, take it out and align the welding points of the disc transducer with the cable in the groove on the bottom. Then place the cable in the groove and semi-conical groove reserved in the middle frame and upper mold. Close the upper mold, middle frame and bottom mold. Slowly pour the liquid rubber that has been mixed evenly and degassed under vacuum into the mold. After the liquid rubber fills the mold, put the upper half of the vulcanizing mold into the oven for vulcanization. After vulcanization, take out the upper half vulcanized product and proceed with the vulcanization of the lower half. (ii) Lower half vulcanization The vulcanized upper half of the product is placed on the bottom of the lower half vulcanizing mold. The cylindrical holes formed on the outer periphery of the upper half of the product are fixed on the cylinders on the bottom of the lower half vulcanizing mold. The lower half vulcanizing mold is positioned and fixed using several cylinders on the bottom. Then, the middle frame and the upper mold are combined with the lower bottom in sequence. The liquid rubber that has been mixed evenly and degassed under vacuum is slowly poured into the mold. After the liquid rubber fills the mold, the lower half vulcanizing mold is placed in an oven for vulcanization. After vulcanization, the product is taken out, and a liquid rubber-coated disc transducer product with a complete and defect-free surface is obtained.

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