A tool and method for bonding a pneumatic seal ring of a stern shaft sealing device

Abstract

The present application relates to a kind of stern shaft sealing device inflation seal ring bonding tool and bonding method, gasket is loaded into the inner cavity of inflation seal ring before bonding, and inflation seal ring is fixed and supported, and the section to be bonded of inflation seal ring is fitted with the internal profile of clamping plate, and the lower surface of gasket is fixedly connected on bottom plate, bottom plate front and rear end is fixedly connected clamping plate respectively, heating plate is placed between two clamping plates, heating plate is pressed into inflation seal ring along the profile of inflation seal ring, and is fixedly connected with bottom plate, so that inflation seal ring is pressed and adheres to the two bonding end surfaces of inflation seal ring under the guiding action between heating plate, two clamping plates and bottom plate, to ensure that the bonding section of inflation seal ring can be closely fitted;Heating rod and thermistor are inserted into bonding tool through heating hole on heating plate, for heating and completing the heat vulcanization of inflation seal ring;Temperature controller input end is connected with thermistor, and output end is connected with heating rod through relay.

Description

Technical Field

[0001] This invention relates to an inflatable sealing ring for a stern shaft sealing device, and more particularly to an adhesive tool and adhesive method for bonding the inflatable sealing ring for a stern shaft sealing device. Background Technology

[0002] The stern shaft sealing device's inflatable sealing ring has a concave-convex cross-section and is symmetrically annular in shape. Its three-dimensional model (see...) Figure 1 Before the air seal ring is filled with pressurized air (see...) Figure 2 (a) A certain gap is maintained between the bottom of the sealing ring and the stern shaft, allowing seawater from outside the hull to communicate with the interior of the sealing device through the gap channel. After pressurized air is introduced (see...), Figure 2 (b) The protrusion at the bottom of the sealing ring will bulge out and hug the stern shaft. The toothed seal on the sealing ring will fit tightly against the shaft to achieve a sealing effect. At this time, the seawater outside the hull will be isolated from the inside of the sealing device.

[0003] The replacement methods for pneumatic seals in ship stern shaft sealing devices are generally divided into integral replacement and split replacement. Replacing an integral pneumatic seal often requires removing the entire mounting base and pulling out the shaft. This method involves a large amount of work, is costly, and has a long construction period. However, during dry dock repairs, the main shaft is usually not moved due to factors such as alignment and docking time. This makes integral pneumatic seals less commonly used in maintenance. Split-type pneumatic sealing rings are typically bonded using adhesives. Adhesives can be categorized into three main types: thermoplastic and rubber-based. Widely used adhesives include chloroprene adhesives, polysulfide adhesives, and cyanoacrylate (i.e., 501). However, due to the complex cross-sectional shape and operating conditions of pneumatic sealing rings, the bonding process for split-type pneumatic sealing rings currently has certain limitations. These limitations include low bonding strength, complex operation, easy misalignment, and susceptibility to cracking or detachment. Furthermore, existing adhesive bonding methods are highly sensitive to ambient temperature, and bonding failure is very likely to occur when bonding is performed in winter or at low ambient temperatures. Summary of the Invention

[0004] This invention provides a bonding tool and method for inflatable sealing rings in stern shaft sealing devices. Based on extensive summarization and optimization of existing bonding processes for inflatable sealing rings in stern shaft sealing devices, a set of tools and methods for fixing and heating the inflatable sealing rings has been designed. It mainly comprises two parts: a mechanical bonding fixture and a temperature control system. The mechanical fixture fixes the surface of the inflatable sealing ring to be bonded and provides clamping force. The temperature control system controls the temperature of the hot vulcanization bonding process, ensuring that the rubber vulcanizes at a reasonable temperature, ultimately completing the hot vulcanization bonding of the inflatable sealing ring. This significantly improves the bonding efficiency and reliability, and enhances the overall maintainability of the stern shaft sealing device.

[0005] To achieve the above objectives, the technical solution of the present invention is: a bonding tool for an inflatable sealing ring of a stern shaft sealing device, comprising a gasket, a base plate, a heating plate, a clamping plate, a thermistor, a temperature controller, a relay, and a heating rod. The gasket is inserted into the inner cavity of the inflatable sealing ring before bonding, providing fixed support and ensuring that the cross-section of the inflatable sealing ring to be bonded fits the inner contour of the clamping plate. The gasket is fixedly connected to the base plate, and clamping plates are fixedly connected to the front and rear ends of the base plate, respectively. A space is placed between the two clamping plates. A heating plate is pressed into the inflatable sealing ring along its contour and fixedly connected to the base plate. Under the guidance of the heating plate, two clamping plates, and the base plate, the two bonding ends of the inflatable sealing ring are pressed together firmly, ensuring a tight fit between the bonding sections of the inflatable sealing ring. A heating rod and a thermistor are inserted into the bonding tool through heating holes on the heating plate to heat and complete the thermal vulcanization of the inflatable sealing ring. The temperature controller's input is connected to the thermistor, and its output is connected to the heating rod via a relay.

[0006] Furthermore, the inner contours of the two clamping plates are adapted to the cross-sectional shape of the inflatable sealing ring, and the two ends of the inflatable sealing ring are clamped and fixed to the base plate by bolts before bonding.

[0007] Furthermore, the inner contour of the heating plate is adapted to the cross-sectional shape of the inflatable sealing ring, and the inflatable sealing ring is pressed in along the contour of the inflatable sealing ring and fixed to the base plate by bolts, which serves to conduct heat during the bonding process.

[0008] A bonding method for a bonding tool using an inflatable sealing ring for a stern shaft sealing device, comprising the following steps:

[0009] (1) Before bonding the inflatable sealing ring, wipe the bonding surface of the inflatable sealing ring with acetone or alcohol solvent to remove the grease on the surface; at the same time, in order to ensure sufficient contact between the contact surfaces, cut a piece of raw rubber with the same cross-sectional shape as the inflatable sealing ring as the bonding material and press it between the two surfaces to be bonded during the bonding process.

[0010] (2) Based on the vulcanization temperature characteristics of rubber, a vulcanization temperature curve is proposed to control the hot vulcanization bonding to achieve the best effect. A temperature control system is designed to complete the automatic control method of the vulcanization process.

[0011] A temperature control system is used to automate the vulcanization process. Specifically, during the bonding process, the temperature controller receives the temperature signal from the thermistor, processes the signal, and outputs it to two relays to control the two heating rods to heat the inside of the tool. As the temperature rises, the temperature signal received by the thermistor is fed back to the temperature controller, forming a closed-loop control. This achieves non-linear heating of the tool and ensures that the gas-filled sealing ring completes vulcanization at the optimal temperature.

[0012] The beneficial effects of this invention are:

[0013] The bonding tool and method for the inflatable sealing ring of the stern shaft sealing device of the present invention, through clamping and fixing with special tooling, can complete the bonding of the inflatable sealing ring with irregular cross-sectional shapes. At the same time, the hot vulcanization process is used to bond the inflatable sealing ring. Since the chemical bond is formed, the bonding strength and reliability can be guaranteed. This solves the problems of low bonding strength, complicated operation, easy misalignment, cracking or falling off of traditional adhesive bonding methods. It greatly improves the reliability, safety and maintainability of the bonding of the inflatable sealing ring of the stern shaft tube sealing device, and greatly reduces the maintenance cost of the stern shaft tube sealing device. Attached Figure Description

[0014] Figure 1 This is a structural diagram of an inflatable sealing ring;

[0015] Figure 2 This is a diagram illustrating the working principle of an inflatable sealing ring.

[0016] Figure 3 It is a 3D diagram of the bonding fixture structure;

[0017] Figure 4 These are the three views of the bonding fixture structure;

[0018] Wherein: (a) is the front view, (b) is the left view, and (c) is the top view;

[0019] Figure 5 This is a 3D view of the base plate structure;

[0020] Figure 6 This is a schematic diagram of the base plate structure;

[0021] Wherein: (a) is the front view, and (b) is the top view;

[0022] Figure 7 This is a 3D diagram of the padding structure;

[0023] Figure 8 This is a schematic diagram of the padding structure;

[0024] Where: (a) is the front view, and (b) is the left view;

[0025] Figure 9 This is a 3D diagram of the heating plate structure;

[0026] Figure 10 These are three views of the heating plate structure;

[0027] Wherein: (a) is the front view, (b) is the left view, and (c) is the top view;

[0028] Figure 11This is a 3D view of the clamping plate structure;

[0029] Figure 12 This is a schematic diagram of the clamping plate structure.

[0030] Wherein: (a) is the front view, and (b) is the top view;

[0031] Figure 13 This is a diagram of the temperature control system.

[0032] Figure 14 This is an installation diagram of the bonding fixture;

[0033] Figure 15 It is a graph showing the relationship between vulcanization temperature and time. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] like Figures 3 to 15 As shown in the embodiment of the present invention, an inflatable sealing ring bonding tool for a stern shaft sealing device includes a gasket 1, a base plate 2, a heating plate 3, a clamping plate 1 4, a clamping plate 2 5, a thermistor 6, a temperature controller, a heating rod 1 7, a heating rod 2 8, a relay 1 9, and a relay 2 10.

[0036] Before bonding, the gasket 1 is inserted into the inner cavity of the inflatable sealing ring to provide a fixed support. The bonding section of the inflatable sealing ring fits the inner contour of the clamping plate. The clamping plate 4 and clamping plate 5 are fixed to the base plate 2 with bolts. The gasket 1 is also fixed to the base plate 2 with bolts. The heating plate 3 is pressed into the inflatable sealing ring along the contour of the inflatable sealing ring and fixed to the base plate 2 with bolts. At this time, the guiding effect of the heating plate 3, clamping plate 4, clamping plate 5 and base plate 2 presses the two bonding end faces of the inflatable sealing ring together and ensures that the bonding section of the inflatable sealing ring can fit tightly.

[0037] like Figure 14 As shown, heating rod 7 and heating rod 8, along with the thermistor 6, are inserted into the fixture through the heating holes on the heating plate 3. During the bonding process, the temperature controller receives the temperature signal input from the thermistor 6, processes the signal, and outputs it to relays 9 and 10 to control heating rod 7 and heating rod 8 to heat the interior of the fixture. Simultaneously, as the temperature rises, the temperature signal received by the thermistor 6 continues to be fed back to the temperature controller, forming a closed-loop control to achieve non-linear heating of the fixture and ensure that the gas-filled sealing ring completes vulcanization at the optimal temperature.

[0038] The bonding tool and bonding process for the pneumatic sealing ring of the stern shaft sealing device of the present invention have the following specific requirements:

[0039] I. Structural Design of Adhesion Tools

[0040] This bonding tool's gasket, base plate, heating plate, and clamping plate are designed according to the size and cross-sectional shape of the inflatable sealing ring, and can adapt to the bonding of different models of inflatable sealing rings. The specific functions of each part are as follows:

[0041] 1) The gasket is inserted into the inner cavity of the inflatable sealing ring before bonding to provide support for the inflatable sealing ring;

[0042] 2) The base plate serves as the base for the bonding tool, providing fixed support for the entire tool set;

[0043] 3) The inner contours of clamping plate one and clamping plate two are designed according to the cross-sectional shape of the inflatable sealing ring. Before bonding, the two ends of the inflatable sealing ring are clamped and fixed to the base plate with bolts.

[0044] 4) The inner contour of the heating plate is designed according to the cross-sectional shape of the inflatable sealing ring. The inflatable sealing ring is pressed in along the contour of the inflatable sealing ring and connected to the base plate by bolts. The bonding process plays a role in heat conduction.

[0045] 5) The guiding effect between the base plate and the heating plate can press the two bonding ends of the inflatable sealing ring together firmly to ensure the bonding strength;

[0046] 6) Insert the electric heating rod and thermistor into the fixture through the heating holes on the heating plate, and heat to complete the thermal vulcanization of the gas-filled sealing ring (see...). Figure 14 ).

[0047] II. Bonding Process Flow Design

[0048] This bonding method is a heat vulcanization bonding process that involves the establishment of individual chemical bonds. Therefore, before bonding the inflatable sealing rings, the bonding surfaces must be wiped with solvents such as acetone or alcohol to remove surface grease. Simultaneously, to ensure sufficient contact between the contact surfaces, a piece of raw rubber with the same cross-sectional shape as the inflatable sealing ring is cut as the bonding material and pressed between the two surfaces to be bonded.

[0049] Because rubber is a poor conductor of heat, excessively high or rapid temperature rises during the hot vulcanization bonding of inflatable sealing rings can lead to uneven heating of the rubber and weak adhesion. Therefore, based on the vulcanization temperature characteristics of rubber, a vulcanization temperature curve was proposed. Figure 15 To achieve optimal results in hot vulcanization bonding, a temperature control system was designed to automate the vulcanization process, as detailed below:

[0050] like Figure 13As shown, after receiving the real-time temperature signal from the thermistor, the temperature controller processes the temperature signal and outputs it to relay one and relay two to control heating rod one and heating rod two to heat the inside of the tooling. At the same time, after the temperature rises, the temperature signal received by the thermistor continues to be fed back to the temperature controller, forming a closed-loop control to realize the non-linear temperature rise of the tooling heating process.

Claims

1. A bonding tool for an inflatable sealing ring of a stern shaft sealing device, characterized in that: The system includes a gasket, a base plate, a heating plate, clamping plates, a thermistor, a temperature controller, a relay, and a heating rod. The gasket is inserted into the inner cavity of the inflatable sealing ring before bonding, providing fixed support and ensuring that the bonding section of the inflatable sealing ring aligns with the inner contour of the clamping plates. The gasket is fixedly connected to the base plate. Clamping plates are fixedly connected to the front and rear ends of the base plate, respectively. A heating plate is placed between the two clamping plates. The heating plate presses into the inflatable sealing ring along its contour and is fixedly connected to the base plate. Under the guiding action of the heating plate, the two clamping plates, and the base plate, the two bonding ends of the inflatable sealing ring are pressed together. The fit is tight, ensuring a close bond between the inflatable sealing ring and the adhesive cross-section. A heating rod and thermistor are inserted into the bonding tool through heating holes on the heating plate to heat and complete the thermal vulcanization of the inflatable sealing ring. The temperature controller's input is connected to the thermistor, and its output is connected to the heating rod via a relay. The inner contours of the two clamping plates are adapted to the cross-sectional shape of the inflatable sealing ring, and before bonding, the two ends of the inflatable sealing ring are clamped and fixed to the base plate with bolts. The inner contour of the heating plate is adapted to the cross-sectional shape of the inflatable sealing ring, pressing the inflatable sealing ring along its contour and fixing it to the base plate with bolts, serving as a heat conductor during the bonding process.

2. A bonding method using a bonding tool for the inflatable sealing ring of the stern shaft sealing device as described in claim 1, characterized in that, The steps are as follows: (1) Before bonding the inflatable sealing ring, wipe the bonding surface of the inflatable sealing ring with acetone or alcohol solvent to remove the grease on the surface; at the same time, in order to ensure sufficient contact between the contact surfaces, cut a piece of raw rubber with the same cross-sectional shape as the inflatable sealing ring as the bonding material and press it between the two surfaces to be bonded during the bonding process. (2) Based on the vulcanization temperature characteristics of rubber, a vulcanization temperature curve is proposed to control the hot vulcanization bonding to achieve the best effect. A temperature control system is designed to complete the automatic control method of the vulcanization process.

3. The bonding method according to claim 2, characterized in that: The automated control method for the vulcanization process using a temperature control system includes the following steps: During the bonding process, the temperature controller receives the temperature signal input from the thermistor, processes the signal, and outputs it to two relays to control the two heating rods to heat the inside of the tool. Simultaneously, as the temperature rises, the temperature signal received by the thermistor continues to be fed back to the temperature controller, forming a closed-loop control. This achieves non-linear heating of the tool, ensuring that the gas-filled sealing ring completes vulcanization at the optimal temperature.

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