Bonding tool and bonding method for inflatable sealing ring of stern shaft sealing device

Abstract

The invention relates to a bonding tool and a bonding method for an inflatable sealing ring of a stern shaft sealing device, a liner is arranged in an inner cavity of the inflatable sealing ring before the inflatable sealing ring is bonded, the inflatable sealing ring is fixedly supported, the section to be bonded of the inflatable sealing ring is attached to the inner contour of a clamping plate, and the lower part of the liner is fixedly connected to a bottom plate; clamping plates are fixedly connected to the front end and the rear end of the bottom plate respectively, a heating plate is placed between the two clamping plates, and the heating plate is pressed into the inflatable sealing ring along the outline of the inflatable sealing ring and fixedly connected with the bottom plate, so that the inflatable sealing ring presses and attaches the two bonding end faces of the inflatable sealing ring tightly under the guiding action of the heating plate, the two clamping plates and the bottom plate; therefore, the bonding cross section of the inflatable sealing ring can be ensured to be tightly attached; the heating rod and the thermistor are plugged into the bonding tool through a heating hole in the heating plate and are used for heating and completing heat vulcanization of the inflatable sealing ring; and the output end of the temperature controller is connected with the heating rod through the relay.

Description

Technical Field

[0001] The invention relates to an inflatable sealing ring of a stern shaft sealing device, in particular to a bonding tool and a bonding method of the inflatable sealing ring of a stern shaft sealing device. Background Art

[0002] The cross section of the inflatable seal ring of the stern shaft seal device is a concave shape with a convex shape, and the whole is a symmetrical ring. Its three-dimensional model diagram (see Figure 1 ), before the inflatable seal ring is filled with pressurized air (see Figure 2 (a)), a certain gap is kept between the bottom of the sealing ring and the stern shaft, and the seawater outside the ship is connected to the inside of the sealing device through the gap channel. After the pressurized air is filled (see Figure 2 (b)), the protrusion at the bottom of the sealing ring will bulge out and hug the stern shaft, and the toothed seal on the sealing ring will fit tightly against the shaft to act as a seal. At this time, the seawater outside the ship is isolated from the inside of the sealing device.

[0003] The existing methods of replacing the inflatable seal ring of the stern shaft sealing device of a ship are generally divided into integral replacement and split replacement. Replacing the integral inflatable seal ring often requires the installation seat to be removed as a whole and the shaft to be pulled out before it can be completed. This replacement method has a large amount of work, high cost and long construction period. Usually, during the docking period of a ship, the main shaft will not be moved due to factors such as alignment and docking time, which makes the integral inflatable seal ring less used in the maintenance process. Split-type inflatable sealing rings are usually bonded with adhesives, which can be divided into three categories: thermoplastic, or rubber. The most widely used ones include chloroprene adhesives, polysulfide adhesives, cyanoacrylate (ie 501), etc. However, due to the complex cross-sectional shape and operating conditions of the inflatable sealing ring, the current bonding process of the split-type inflatable sealing ring still has certain limitations, such as low bonding strength, complex operation, easy dislocation, easy cracking or falling off, etc. In addition, the existing adhesive bonding method has high requirements for the ambient temperature. It is very easy to fail when bonding in winter or when the ambient temperature is low. Summary of the invention

[0004] The present invention is to provide a bonding tool and bonding method for the inflatable sealing ring of the stern shaft sealing device. After summarizing the problems existing in the bonding process of the inflatable sealing ring of the existing stern shaft sealing device and optimizing it, a set of tools and methods for fixing and heating the inflatable sealing ring are designed, which mainly include two parts: a mechanical bonding tool and a temperature control system. The mechanical tool part fixes the surface of the inflatable sealing ring to be bonded and provides a clamping force. The temperature control system controls the temperature of the hot vulcanization bonding process to ensure that the rubber is vulcanized at a reasonable temperature, and finally completes the hot vulcanization bonding of the inflatable sealing ring. The bonding efficiency and reliability are greatly improved, and the overall maintainability of the stern shaft sealing device is improved.

[0005] To achieve the above purpose, 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 bottom plate, a heating plate, a clamping plate, a thermistor, a temperature controller, a relay, and a heating rod. The gasket is installed in the inner cavity of the inflatable sealing ring before bonding the inflatable sealing ring to fix and support the inflatable sealing ring, and the cross section of the inflatable sealing ring to be bonded is made to fit the inner contour of the clamping plate, and the bottom of the gasket is fixedly connected to the bottom plate, and the clamping plates are fixedly connected to the front and rear ends of the bottom plate, respectively, and a plate is placed between the two clamping plates. The heating plate is pressed into the inflatable sealing ring along the contour of the inflatable sealing ring and is fixedly connected to the base plate, so that the inflatable sealing ring can press the two bonding end faces of the inflatable sealing ring together under the guiding action of the heating plate, the two clamping plates and the base plate, thereby ensuring that the bonding section of the inflatable sealing ring can fit tightly; the heating rod and the thermistor are inserted into the bonding tool through the heating hole on the heating plate to heat and complete the thermal vulcanization of the inflatable sealing ring; the input end of the temperature controller is connected to the thermistor, and the output end is connected to the heating rod through 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 bottom 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, the inflatable sealing ring is pressed in along the contour of the inflatable sealing ring, and is fixedly connected to the base plate by bolts to play a heat conduction role in the bonding process.

[0008] A bonding method using a bonding tool of an inflatable sealing ring of a stern shaft sealing device, the steps of which are:

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

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

[0011] A temperature control system is used to complete the automatic control method of the vulcanization process, specifically including: during the bonding process, the temperature controller processes the temperature signal after receiving the temperature signal input by the thermistor, and outputs the temperature signal to two relays after processing, which are used to control the two heating rods to heat the inside of the tool respectively. At the same time, after the temperature rises, the temperature signal received by the thermistor continues to be fed back to the temperature controller to form a closed-loop control, thereby realizing nonlinear temperature rise in the tool heating process and ensuring that the inflatable sealing ring completes vulcanization at the optimal temperature.

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

[0013] The bonding tool and bonding method of the inflatable sealing ring of the stern shaft sealing device of the present invention can complete the bonding of the inflatable sealing ring with irregular cross-section shape through clamping and fixing by special tooling; at the same time, the inflatable sealing ring is bonded by a hot vulcanization process, and since a chemical bond connection is formed, the bonding strength and reliability can be guaranteed, which solves the problems of low bonding strength, complex operation, easy dislocation, easy cracking or falling off in the traditional adhesive bonding method, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the structural diagram of the inflatable sealing ring;

[0015] Figure 2 This is the working principle diagram of the inflatable sealing ring;

[0016] Figure 3 It is a three-dimensional diagram of the bonding tooling structure;

[0017] Figure 4 It is the three-view drawing of the bonding tooling structure;

[0018] Among them: (a) is the main view, (b) is the left view, and (c) is the top view;

[0019] Figure 5 It is a three-dimensional diagram of the bottom plate structure;

[0020] Figure 6 It is a schematic diagram of the bottom plate structure plane;

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

[0022] Figure 7 It is a three-dimensional diagram of the cushion structure;

[0023] Figure 8 It is a plan view of the liner structure;

[0024] Among them: (a) is the main view, (b) is the left view;

[0025] Fig. 9 It is a three-dimensional diagram of the heating plate structure;

[0026] Fig.10 It is the three-view drawing of the heating plate structure;

[0027] Among them: (a) is the main view, (b) is the left view, and (c) is the top view;

[0028] Fig.11It is a three-dimensional diagram of the clamping plate structure;

[0029] Fig.12 is a plan view of the clamping plate structure;

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

[0031] Fig.13 It is the temperature control system composition diagram;

[0032] Fig.14 It is the bonding tool installation drawing;

[0033] Fig.15 It is a graph of vulcanization temperature and time. DETAILED DESCRIPTION

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

[0035] like Figures 3 to 15 As shown, an inflatable sealing ring bonding tool for a stern shaft sealing device proposed in an embodiment of the present invention 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 installed into the inner cavity of the inflatable sealing ring to play a fixing and supporting role. The cross-section of the inflatable sealing ring to be bonded fits the internal contour of the clamping plate. The clamping plate 1 4 and the clamping plate 2 5 are fixed to the base plate 2 by bolts. The gasket 1 and the base plate 2 are also fixed by bolts. The heating plate 3 is pressed into the space between the inflatable sealing ring and the base plate 2 along the contour of the inflatable sealing ring and fixed by bolts. At this time, the guiding effect of the inflatable sealing ring between the heating plate 3, the clamping plate 1 4, the clamping plate 2 5 and the base plate 2 presses the two bonding end faces of the inflatable sealing ring together to ensure that the bonding cross-section of the inflatable sealing ring can fit tightly.

[0037] like Fig.14 As shown, the heating rod 1 7, the heating rod 2 8 and the thermistor 6 are inserted into the tooling through the heating holes on the heating plate 3. During the bonding process, the temperature controller receives the temperature signal input by the thermistor 6, processes the temperature signal, and outputs it to the relay 1 9 and the relay 2 10 to control the heating rod 1 7 and the heating rod 2 8 to heat the inside of the tooling. At the same time, after 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 nonlinear temperature rise in the tooling heating process, thereby ensuring that the inflatable sealing ring is vulcanized at the optimal temperature.

[0038] The specific requirements for the bonding tool and bonding process of the inflatable sealing ring of the stern shaft sealing device of the present invention are as follows:

[0039] 1. Structural design of bonding tools

[0040] The gasket, base plate, heating plate and clamping plate of this bonding tool are designed according to the size and cross-sectional shape of the inflatable sealing ring, and can be used for bonding inflatable sealing rings of different types. The specific functions of each part are as follows:

[0041] 1) Before bonding, the liner is inserted into the inner cavity of the inflatable sealing ring to support the inflatable sealing ring;

[0042] 2) The bottom plate is the base of the bonding tool and serves as a fixed support for the entire set of tools;

[0043] 3) The inner contours of the clamping plate 1 and the clamping plate 2 are designed according 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 bottom plate by bolts before bonding;

[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 into the inflatable sealing ring along the contour of the inflatable sealing ring and connected with the bottom plate bolts. The bonding process plays a role in heat conduction;

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

[0046] 6) Insert the electric heating rod and thermistor into the tooling through the heating hole on the heating plate, heat and complete the thermal vulcanization of the inflatable sealing ring (see Fig.14 ).

[0047] 2. Bonding process design

[0048] This bonding method is a hot vulcanization bonding process that involves the establishment of chemical bonds. Therefore, before bonding the inflatable seal ring, the bonding surface must be wiped with solvents such as acetone or alcohol to remove the grease on the surface. At the same time, in order to ensure full contact between the contact surfaces, during the bonding process, raw rubber with the same cross-sectional shape as the inflatable seal ring is cut as the bonding material and pressed between the two surfaces to be bonded.

[0049] Since rubber is a poor conductor of heat, when performing hot vulcanization bonding of the inflatable seal ring, if the temperature rises too high or the heating is too fast, the rubber will be heated unevenly and the bonding will not be strong. Therefore, according to the vulcanization temperature characteristics of rubber, a vulcanization process temperature curve ( Fig.15 ), in order to control the hot vulcanization bonding to achieve the best effect, a temperature control system is designed to complete the automatic control of the vulcanization process, as follows:

[0050] like Fig.13As shown, after the temperature controller receives the real-time temperature signal input by the thermistor, it processes the temperature signal and outputs it to relay 1 and relay 2 to control heating rod 1 and heating rod 2 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 achieve nonlinear temperature rise in the tooling heating process.

Claims

1. A bonding tool for an inflatable seal ring of a stern shaft sealing device, characterized in that: The utility model comprises 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 installed into the inner cavity of the inflatable sealing ring before the inflatable sealing ring is bonded, so as to fix and support the inflatable sealing ring and make the cross section of the inflatable sealing ring to be bonded fit with the inner contour of the clamping plate, and the bottom of the gasket is fixedly connected to the base plate, and the clamping plates are fixedly connected to the front and rear ends of the base plate respectively, and a heating plate is placed between the two clamping plates, and the heating plate is pressed into the inflatable sealing ring along the contour of the inflatable sealing ring and fixedly connected to the base plate, so that the inflatable sealing ring can press the two bonding end faces of the inflatable sealing ring tightly under the guiding action of the heating plate, the two clamping plates and the base plate, thereby ensuring that the bonding cross section of the inflatable sealing ring can fit tightly; the heating rod and the thermistor are inserted into the bonding tool through the heating hole on the heating plate, so as to heat and complete the thermal vulcanization of the inflatable sealing ring; the input end of the temperature controller is connected to the thermistor, and the output end is connected to the heating rod through the relay.

2. The bonding tool for the inflatable seal ring of the stern shaft sealing device according to claim 1, characterized in that: The inner contours of the two clamping plates are matched with the cross-sectional shape of the inflatable sealing ring, and the two ends of the inflatable sealing ring are clamped and fixed on the bottom plate by bolts before bonding.

3. The bonding tool for the inflatable seal ring of the stern shaft sealing device according to claim 1, characterized in that: The inner contour of the heating plate is matched with the cross-sectional shape of the inflatable sealing ring, the inflatable sealing ring is pressed into the inflatable sealing ring along the contour, and is fixedly connected to the bottom plate by bolts to play a heat conduction role in the bonding process.

4. A bonding method using the bonding tool for the inflatable seal ring of the stern shaft sealing device according to any one of claims 1 to 3, characterized in that: The steps are: (1) Before bonding the inflatable sealing ring, use acetone or alcohol solvent to wipe the bonding surface of the inflatable sealing ring to remove the grease on the surface; at the same time, in order to ensure sufficient contact between the contact surfaces, cut raw rubber with the same cross-sectional shape as the inflatable sealing ring as the bonding material during the bonding process and press it between the two surfaces to be bonded; (2) According to the vulcanization temperature characteristics of rubber, a vulcanization process temperature curve is formulated to control the hot vulcanization bonding to achieve the best effect, and a temperature control system is designed to complete the automatic control method of the vulcanization process.

5. The bonding method according to claim 4, characterized in that: The automatic control method of using a temperature control system to complete the vulcanization process specifically includes: during the bonding process, the temperature controller processes the temperature signal after receiving the temperature signal input by the thermistor, and outputs the temperature signal to two relays after processing, which are used to control the two heating rods to heat the inside of the tool respectively. At the same time, after the temperature rises, the temperature signal received by the thermistor continues to be fed back to the temperature controller to form a closed-loop control, thereby realizing nonlinear temperature rise in the tool heating process and ensuring that the inflatable sealing ring completes vulcanization at the optimal temperature.

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