A potting mold and potting method for a water acoustic transducer

Abstract

The application discloses a kind of potting mould and potting method of underwater acoustic transducer, including mould body, mould body is equipped with the cavity of adaptation with cylindrical transducer, the bottom of cavity is further equipped with the drive mechanism that can drive the up and down movement of cylindrical transducer placed in cavity, the upper end of drive mechanism is equipped with the connecting portion connected with the bottom of cylindrical transducer, the lower end of drive mechanism penetrates cavity and extends to the outside of mould body;The cofferdam of mould body upper portion is along cavity ring and is equipped with, the size of cofferdam is greater than the diameter of cavity, the bottom of cofferdam is higher than the height of concave surface part of cylindrical transducer when cylindrical transducer is down to the maximum stroke place of cavity.The application effectively solves the problem of polyurethane glue surface scar through the unique design of potting mould, and improves the detection accuracy of transducer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater acoustic transducer, and particularly relates to a pouring and sealing mold and a pouring and sealing method for underwater acoustic transducer. BACKGROUND

[0002] Polyurethane pouring and sealing is an important link for water tightness of underwater acoustic transducer, and with the increasing performance requirements of underwater acoustic transducer, higher requirements are put forward for polyurethane pouring and sealing. Generally, polyurethane glue pouring and sealing is performed on the concave part of the cylindrical underwater acoustic transducer by the following method: glue is injected through the glue injection port of the mold, and glue is discharged through the glue overflow port, so as to realize pouring and sealing on the concave part of the underwater acoustic transducer, so as to achieve the effect of filling the concave part and making the cylindrical surface of the cylindrical underwater acoustic transducer flat. Figure 1 At this time, the glue injection port 5 and the glue overflow port 4 need to be designed on the pouring and sealing mold body 1. When polyurethane glue is injected, the glue is injected from the glue injection port 5 and overflowed from the glue overflow port 4. After the polyurethane glue is solidified at the concave part 3 of the cylindrical transducer 2, the excess polyurethane glue solidified at the glue injection port and the glue overflow port needs to be cut off, so as to form obvious scars on the polyurethane layer poured and sealed outside the concave part 3 of the cylindrical transducer 2. The existence of the scars not only affects the authenticity and effectiveness of the transducer receiving signal, but also affects the vibration mode and pressure resistance of the transducer, resulting in the decline of the detection accuracy of the transducer. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a pouring and sealing mold and a pouring and sealing method for underwater acoustic transducer, which effectively solve the problem of polyurethane glue surface scars through the unique design of the pouring and sealing mold and the special operation of the process, and improve the detection accuracy of the transducer.

[0004] The technical solution of the present application is to provide a pouring and sealing mold for underwater acoustic transducer, which comprises a mold body, a cavity adapted to the cylindrical transducer is arranged in the mold body, a driving mechanism capable of driving the cylindrical transducer placed in the cavity to move up and down is further arranged at the bottom of the cavity, a connecting part connected with the bottom of the cylindrical transducer is arranged at the upper end of the driving mechanism, and the lower end of the driving mechanism penetrates through the cavity and extends to the outside of the mold body; a cofferdam is arranged around the cavity at the upper part of the mold body, the size of the cofferdam is greater than the diameter of the cavity, and the bottom of the cofferdam is higher than the height of the concave part of the cylindrical transducer when the cylindrical transducer moves to the maximum stroke position in the cavity.

[0005] The present application is suitable for cylindrical transducers. Due to the particularity of the structure of the cylindrical transducer, the following shortcomings exist when the concave part is poured and sealed by using the existing mold with a glue injection port and a glue overflow port: the mold needs to be designed with a glue injection port and a glue overflow port, so that after pouring and sealing, the excess polyurethane glue at the glue injection port and the glue overflow port needs to be cut off, and obvious scars will be formed, which will greatly affect the acoustic performance of the transducer.

[0006] Therefore, the application cancels the structure of glue injection port and glue overflow port, and increases the pouring and sealing cofferdam structure and driving mechanism, so that the cylindrical transducer concave part can be vertically moved in the cavity under the condition of being immersed in polyurethane glue by pouring and sealing operation, and the purpose of scar-free pouring and sealing of the cylindrical transducer concave part is finally achieved.

[0007] The upper part of the pouring and sealing mold adopts the cofferdam structure, which mainly serves to play the role of cofferdam and support for the polyurethane glue, so as to ensure that the concave part of the pouring and sealing cylindrical transducer is immersed in the polyurethane glue and the air in the cavity is discharged; and the driving mechanism is added to the bottom of the pouring and sealing mold, which mainly serves to realize the vertical movement of the cylindrical transducer in the mold cavity by operating the driving mechanism under the condition that the polyurethane glue immerses the concave part of the cylindrical transducer, so as to ensure that the concave part of the cylindrical transducer can completely enter the cavity, and finally achieve the purpose of smooth surface and no scar of the polyurethane glue body

[0008] Preferably, the upper end face of the cofferdam is consistent with the top of the mold body in height.

[0009] Preferably, the connection between the bottom of the cofferdam and the inner wall of the cavity is chamfered.

[0010] Preferably, the driving mechanism comprises a rack, a gear, a gear seat and a handle, the upper end of the rack is integrally formed with the connecting part, the connecting part is threadedly connected with the bottom screw hole of the cylindrical transducer through a screw, the gear seat is fixedly connected with the bottom of the mold body, the gear is rotatably connected with the gear seat through a rotating shaft and is engaged with the rack while rotating, and one end of the rotating shaft is connected with the handle.

[0011] Preferably, the gear seat is in inverted U-shaped structure, and horizontal connecting arms are extended outward from both sides of the opening end of the gear seat, and the horizontal connecting arms are connected with the bottom of the mold body through screws.

[0012] The application also provides a pouring and sealing method of the pouring and sealing mold of the underwater acoustic transducer.

[0013] Step 1: uniformly coat a layer of release agent in the cavity of the pouring and sealing mold and the cofferdam, put the cylindrical transducer according to the structure requirements, so that the concave part of the cylindrical transducer has a gap with the bottom of the cofferdam, at this time, the upper end face of the cylindrical transducer is higher than the upper end face of the cofferdam, after installation, put it into an oven for preheating, and the preheating temperature is (60℃±2)*3h;

[0014] Step 2: heat the polyurethane glue A component to 55-65℃, and then defoam for standby; and melt the curing agent B component for standby;

[0015] Step 3: mix the polyurethane glue A component and the curing agent B component according to the ratio to form polyurethane glue, and then defoam for pouring after one-way stirring for 70-80s by using a glass rod.

[0016] Step 4, after defoaming, the polyurethane glue is injected from the upper weir of the mold, and when the polyurethane glue is filled in the space between the concave surface of the cylindrical transducer and the cavity until the liquid level of the polyurethane glue is flush with the upper end surface of the weir, the pouring is stopped;

[0017] Step 5, the driving mechanism is operated to make the height of the concave surface of the cylindrical transducer in the cavity lower than the bottom of the weir, and then the polyurethane glue is cured by heating, and the curing temperature is 60℃*24h;

[0018] Step 6, after the pouring mold is naturally cooled, the product is taken out.

[0019] The method uses the weir structure of the mold for pouring, immerses the concave surface of the cylindrical transducer in the polyurethane glue, and realizes the vertical movement of the cylindrical transducer in the mold cavity by operating the driving mechanism. This step is the key to realize the method, and when the upper end surface of the cylindrical transducer is flush with the upper end surface of the weir, the operation of the driving mechanism is stopped. Then the polyurethane glue is cured by heating, and the smooth and scar-free pouring of the transducer polyurethane surface is realized.

[0020] Further, in step 5, when the height of the concave surface of the cylindrical transducer in the cavity is lower than the bottom of the weir and the upper end surface of the cylindrical transducer is flush with the upper end surface of the weir, the operation of the displacement mechanism is stopped and cured by heating.

[0021] Compared with the prior art, the above scheme has the following advantages: by adding a weir and a driving mechanism to the pouring mold, the concave surface of the cylindrical transducer is scar-free and polyurethane-poured during pouring, effectively solving the problem of polyurethane glue surface scars caused by conventional pouring methods, improving the authenticity and effectiveness of transducer received signals, and improving transducer detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of traditional mold pouring.

[0023] Figure 2 It is a schematic diagram of mold pouring of the present application.

[0024] Figure 3 It is a schematic diagram of the cylindrical transducer suitable for the present application.

[0025] Figure 4 It is a schematic diagram of the initial state of pouring of the present application.

[0026] Figure 5 It is a schematic diagram of the present application during pouring and curing. DETAILED DESCRIPTION

[0027] The present application will be further described in conjunction with the specific embodiments and the accompanying drawings.

[0028] Referring to Figures 2-5 As shown in the figure, the potting mold of the water acoustic transducer of the embodiment of the present application comprises a mold body 1, the mold body 1 is provided with a cavity 6 matched with the cylindrical transducer 2, the diameter of the cavity 6 is consistent with the diameter of the cylindrical transducer 2, the bottom of the cavity 6 is further provided with a driving mechanism capable of driving the cylindrical transducer placed in the cavity to move up and down, the upper end of the driving mechanism is provided with a connecting part connected with the bottom of the cylindrical transducer 2 to be potted, and the lower end of the driving mechanism penetrates through the cavity and extends out of the mold body 1; a cofferdam 11 is arranged around the cavity at the upper part of the mold body 1, the size of the cofferdam 11 is larger than the diameter of the cavity 6, that is, the diameter of the cavity surrounded by the cofferdam is larger than the diameter of the cavity, so that after the cylindrical transducer is put in, polyurethane glue can be injected between the inner wall of the cavity 6 and the cofferdam 11, and the bottom of the cofferdam 11 is higher than the height of the concave part 3 of the cylindrical transducer when the cylindrical transducer moves to the maximum stroke position of the cavity 6, that is, when the cylindrical transducer moves to the maximum stroke position of the cavity, the position of the concave part of the cylindrical transducer is lower than the height of the bottom of the cofferdam.

[0029] The present application is suitable for the injection of the concave part of the cylindrical transducer. Due to the particularity of the structure of the cylindrical transducer, when the concave part is potted by using the existing mold with a glue injection port and a glue overflow port, the mold needs to be designed with a glue injection port and a glue overflow port, which results in that after potting and forming, the excess polyurethane glue at the glue injection port and the glue overflow port needs to be cut off, and obvious scars will be formed, which will greatly affect the acoustic performance of the transducer.

[0030] Therefore, in the structural design of the present application, the glue injection port and the glue overflow port are cancelled, and the potting cofferdam structure and the driving mechanism are added. During subsequent potting operation, the concave part of the cylindrical transducer can move vertically in the cavity when it is immersed in the polyurethane glue, and the purpose of scar-free potting of the concave part of the cylindrical transducer is finally achieved.

[0031] As a preferred mode, the upper end surface 21 of the cofferdam is consistent with the height of the top of the mold body 1.

[0032] As a preferred mode, the connection between the bottom of the cofferdam 11 and the inner wall of the cavity 6 has a chamfer.

[0033] As a preferred mode, the driving mechanism adopts a rotating-to-linear mechanism, when the rotating mechanism is rotated, the cylindrical transducer can be moved in the vertical direction in the cavity. In the embodiment, the driving mechanism comprises a rack 8, a gear 9, a gear seat 15 and a handle 10, the upper end of the rack is integrally formed with a connecting part, the connecting part is threadedly connected with the bottom screw hole of the cylindrical transducer 2 through a screw 7, and the connection is made by using the inherent screw hole at the bottom of the cylindrical transducer 2, so that damage to the cylindrical transducer can be avoided. The gear seat 15 is fixedly connected with the bottom of the mold body 1, the gear 9 is rotatably connected with the gear seat 15 through a rotating shaft and is engaged with the rack 8 while rotating, and one end of the rotating shaft is connected with the handle 10. In the embodiment, the gear seat 15 is a reverse U-shaped structure, and horizontal connecting arms are extended outward on both sides of the open end of the gear seat 15, and the horizontal connecting arms are connected with the bottom of the mold body 1 through screws 7.

[0034] Of course, the rotating-to-linear mechanisms commonly used in the prior art, such as a worm gear assembly and an eccentric wheel assembly, can be applied to the present application as the driving mechanism, and are not limited to the scheme disclosed in the embodiment.

[0035] The mold is different from the existing pouring process, and is poured by using a conventional method, so that a glue injection port and a feeding port need to be designed on the pouring mold, and the transducer is installed on the mold. When polyurethane glue is injected, the glue is injected from the glue injection port and overflowed from the glue overflow port. At this time, the transducer is in a fixed state in the cavity and will not move. After the polyurethane glue is cured, the excess polyurethane glue at the glue injection port and the glue overflow port needs to be cut off, and obvious scars will be formed. The pouring mold of the present application can avoid this situation.

[0036] Specifically, the pouring method of the present application is as follows,

[0037] Step 1: A layer of release agent is applied to the inner wall of the cavity 6 of the pouring mold, the inner wall of the cofferdam 11 of the pouring mold (including the cofferdam bottom wall), and the non-pouring part of the cylindrical transducer 2, and is ready for use;

[0038] Step 2: The lower end surface 22 of the cylindrical transducer is fixed with the connecting part at the upper part of the rack 8 through a screw 7, and is loaded into the mold body 1, so that the rack 8 is engaged with the gear 9 which is fixed on the bottom of the mold body 1 in advance. By rotating the handle 10, the gear 9 is rotated, and the rack 8 and the cylindrical transducer 2 are moved as a whole, so that the upper part of the concave part 3 of the cylindrical transducer forms a certain glue injection gap with the cofferdam 11, as shown in Figure 4 The glue injection gap is the distance between the chamfer at the connecting part of the cofferdam bottom and the inner wall of the cavity and the concave part of the cylindrical transducer, which facilitates the injection of polyurethane glue into the concave part 3 of the cylindrical transducer;

[0039] Step 3, the polyurethane glue for potting is injected from the injection gap and fills the concave part 3 of the cylindrical transducer, and when the polyurethane glue is leveled with the upper end surface 12 of the cofferdam, the handle 10 is slowly turned counterclockwise to drive the gear 9 to rotate and drive the rack 8 and the cylindrical transducer 2 to move downward as a whole, and when the upper end surface 21 of the cylindrical transducer is leveled with the upper end surface 12 of the cofferdam, the operation of the handle 10 is stopped, as shown in Figure 5

[0040] Step 4, the cylindrical transducer 2 after potting is placed in an oven for warming and curing, and the curing temperature is 60℃*24h.

[0041] Step 5, after cooling, the excess polyurethane glue in the cofferdam is removed, the handle 10 is turned clockwise to drive the gear 9 to rotate and drive the rack 8 and the cylindrical transducer 2 to move upward as a whole, and demolding is realized.

[0042] The method utilizes the cofferdam structure of the mold for potting, immerses the concave part of the cylindrical transducer in the polyurethane glue, and realizes the vertical movement of the cylindrical transducer in the mold cavity by operating the driving mechanism, and this step is the key to realize the method, and when the upper end surface of the cylindrical transducer is leveled with the upper end surface of the cofferdam, the operation of the driving mechanism is stopped, then the warming method is adopted to cure the polyurethane glue, and the smooth and scar-free potting of the transducer polyurethane surface is realized.

[0043] The above only describes the preferred embodiments of the present application, but cannot be understood as a limitation on the claims. Any equivalent structure or equivalent process transformation made by using the present application specification is included in the patent protection range of the present application.​

Claims

1. A potting mold for a hydroacoustic transducer, comprising a mold body, in which a cavity is formed which is adapted to a cylindrical transducer, characterized in that: The bottom of the cavity is further provided with a driving mechanism capable of driving the cylindrical transducer placed in the cavity to move up and down, the upper end of the driving mechanism is provided with a connecting part connected with the bottom of the cylindrical transducer, and the lower end of the driving mechanism penetrates through the cavity and extends out of the mold body; a cofferdam is arranged around the cavity at the upper part of the mold body, the size of the cofferdam is larger than the diameter of the cavity, and the bottom of the cofferdam is higher than the height of the concave part of the cylindrical transducer when the cylindrical transducer moves down to the maximum stroke position of the cavity.

2. The potting mold for a water acoustic transducer of claim 1, wherein: The upper end surface of the cofferdam is consistent with the top of the mold body.

3. The potting mold for a water acoustic transducer of claim 1, wherein: The connecting part between the bottom of the cofferdam and the inner wall of the cavity is chamfered.

4. The potting mold for a water acoustic transducer of claim 1, wherein: The driving mechanism comprises a rack, a gear, a gear seat and a handle, the upper end of the rack is integrally formed with the connecting part, the connecting part is threadedly connected with the bottom screw hole of the cylindrical transducer through a screw, the gear seat is fixedly connected with the bottom of the mold body, the gear is rotatably connected with the gear seat through a rotating shaft and meshes with the rack while rotating, and one end of the rotating shaft is connected with the handle.

5. The potting mold for a water acoustic transducer of claim 4, wherein: The gear seat is in inverted U-shaped structure, and horizontal connecting arms are extended outward from both sides of the opening end of the gear seat, and the horizontal connecting arms are connected with the bottom of the mold body through screws.

6. A potting method of a potting mold of a water acoustic transducer as claimed in any one of claims 1 to 5, characterized in that: The pouring and sealing method comprises the following steps, Step 1: uniformly coat a layer of release agent in the cavity of the pouring and sealing mold and the inner cavity of the cofferdam, place the cylindrical transducer according to the structure requirements, so that there is a gap between the concave part of the cylindrical transducer and the bottom of the cofferdam, at this time the upper end surface of the cylindrical transducer is higher than the upper end surface of the cofferdam, and after installation, preheat in an oven; Step 2: heat the polyurethane adhesive A component to 55-65℃, and then defoam; and melt the curing agent B component, and then use; Step 3: mix the polyurethane adhesive A component and the curing agent B component according to the ratio to form polyurethane adhesive, and then defoam after one-way stirring for 70-80s; Step 4: inject the defoamed polyurethane adhesive from the cofferdam at the upper part of the mold, and stop pouring when the polyurethane adhesive fills the space between the concave part of the cylindrical transducer and the cavity until the liquid surface of the polyurethane adhesive is flush with the upper end surface of the cofferdam; Step 5: operate the driving mechanism to make the height of the concave part of the cylindrical transducer in the cavity lower than the bottom of the cofferdam, and then warm and cure the polyurethane adhesive; Step 6: naturally cool the pouring and sealing mold, and then take out the product.

7. The potting method of the potting mold for the underwater acoustic transducer according to claim 6, characterized by: In step 5, stop the operation of the displacement mechanism when the height of the concave part of the cylindrical transducer in the cavity is lower than the bottom of the cofferdam and the upper end surface of the cylindrical transducer is flush with the upper end surface of the cofferdam, and then warm and cure.

Images