A heating device for installing ship rudder stock bushings and rudder pin bushings.
By using a heating device that combines a metal housing and an electric heating coil with a temperature switch, the problem of improper heating control during the hot-fitting of the rudder shaft sleeve was solved, achieving uniform heating and temperature control, thus improving installation efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU DAYANG MARINE EQUIP CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-31
AI Technical Summary
Existing methods for heat-fitting rudder stock bushings cannot effectively control the heating temperature, resulting in insufficient expansion or excessively high temperatures that reduce hardness and affect product quality.
A heating device comprising a metal housing, an electric heating coil, and a temperature switch is used. The heating process of the rudder shaft sleeve is controlled by electric heating to ensure uniform heating and avoid overheating, and the temperature is controlled by the temperature switch.
This achieves uniform heating of the rudder stock bushing, avoiding plating damage caused by overheating, improving installation efficiency, and ensuring product quality.
Smart Images
Figure CN224583334U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of shipbuilding and installation technology, and more specifically, to a heating device for installing ship rudder stock bushings and rudder pin bushings. Background Technology
[0002] Ships are a general term for all kinds of vessels. They are means of transportation that can navigate or anchor in waterways for transport or operations. Ships have different technical performance, equipment and structural types according to different usage requirements.
[0003] Currently, rudder stock bushings and rudder stock are generally interference fits. Rudder stock bushings need to be heat-fitted onto the rudder stock. However, existing heat-fitting methods typically involve placing the rudder stock bushing in a metal box filled with lubricating oil, then heating the metal box with firewood to heat the rudder stock bushing until it reaches the required temperature before heat-fitting it onto the rudder stock. This heating method makes it impossible to control the heating temperature, which can lead to insufficient heating of the rudder stock bushing, resulting in insufficient expansion, or the bushing bushing annealing due to excessive temperature, leading to reduced hardness and affecting product quality.
[0004] To address the aforementioned problems, this application provides a heating device for installing ship rudder stock bushings and rudder pin bushings. Utility Model Content
[0005] The heating device for installing ship rudder stock bushings and rudder pin bushings provided in this application adopts the following technical solution:
[0006] A heating device for installing ship rudder stock bushings and rudder pin bushings includes a metal housing. A bushing shelf is fitted inside the metal housing. A shelf hole is formed through the inner cavity of the bushing shelf. A support bar is provided on the outer periphery of the bottom of the bushing shelf, and one end of the support bar is fixedly connected to the inner wall of the metal housing. Three electric heating coils are fixedly installed inside the bottom of the metal housing. The three electric heating coils are distributed below the bushing shelf, and the three electric heating coils are connected to a temperature switch via wires. The temperature switch is located on one side of the metal housing and is externally connected to a power supply line.
[0007] Furthermore, the metal box has a prismatic hollow box structure, and pads are fixedly connected to the four corners of the bottom of the metal box.
[0008] Through the above technical solution, the pads can provide stable support and raise the bottom of the metal box, thereby further achieving the thermal insulation effect of the bottom of the metal box.
[0009] Furthermore, all three electric heating coils are designed with a "U"-shaped tubular structure, and the three electric heating coils are linearly and uniformly distributed inside the bottom of the metal housing.
[0010] Furthermore, four support bars are provided, and the four support bars are arranged in a cross shape on the four sides of the bottom periphery of the bushing shelf.
[0011] Through the above technical solution, the four support bars achieve stable support and positioning of the bushing shelf.
[0012] Furthermore, the shelf has multiple holes, and these multiple shelf holes are distributed in a matrix pattern within the inner cavity of the bushing shelf.
[0013] In summary, this application includes the following beneficial technical effects:
[0014] This application utilizes the combined action of a metal housing, electric heating coil, bushing shelf, and temperature switch to eliminate the need for manual heating, avoid open flame operations, ensure uniform heating of the bushing or bushing, guarantee the overall expansion of the bushing or bushing, and provide good heat preservation. At the same time, the heating and heat preservation temperatures can be controlled by the temperature controller to avoid damage to the bushing or bushing plating caused by overheating. It also has the advantages of convenient operation, saving manpower, easy operation, and high efficiency in bushing or bushing installation. Attached Figure Description
[0015] Figure 1 This is one of the structural diagrams of the heating device in this application;
[0016] Figure 2 This is the second structural diagram of the heating device in this application;
[0017] Figure 3 This is a schematic diagram of the electrical control principle of the heating device in this application.
[0018] Explanation of the labels in the diagram:
[0019] 1. Metal housing; 2. Electric heating coil; 3. Bushing shelf; 4. Temperature switch. Detailed Implementation
[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0021] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0023] Example:
[0024] This application discloses a heating device for installing a ship's rudder stock bushing and rudder pin bushing. Please refer to [link to relevant documentation]. Figures 1 to 3 The device includes a metal housing 1, with a bushing shelf 3 fitted inside the metal housing 1. The bushing shelf 3 has a through-hole in its inner cavity. A support bar is provided on the outer periphery of the bottom of the bushing shelf 3, and one end of the support bar is fixedly connected to the inner side wall of the metal housing 1. Three electric heating coils 2 are fixedly installed inside the bottom of the metal housing 1. The three electric heating coils 2 are distributed below the bushing shelf 3, and the three electric heating coils 2 are connected to a temperature switch 4 through wires. The temperature switch 4 is located on one side of the metal housing 1 and is connected to a power cord.
[0025] The metal box 1 has a prismatic hollow box structure, and the four corners of the bottom of the metal box 1 are fixedly connected with pads. The three electric heating coils 2 are all designed with a "U" shaped tubular structure, and the three electric heating coils 2 are linearly and evenly distributed inside the bottom of the metal box 1. There are four support bars, and the four support bars are arranged in a "+" shape on the four sides of the bottom periphery of the bushing shelf 3. There are multiple shelf holes, and the multiple shelf holes are distributed in a matrix in the inner cavity of the bushing shelf 3.
[0026] The implementation principle of this embodiment is as follows: During use, the rudder shaft sleeve can be supported and placed by the bushing shelf 3 inside the metal housing 1. At the same time, the temperature switch 4 controls each electric heating coil 2 inside the metal housing 1 to achieve effective and rapid heating of the rudder shaft sleeve. No manual heating is required, avoiding open flame operation. The bushing or bushing is heated evenly, ensuring the overall expansion of the bushing or bushing. The heat preservation effect is good. The heating and heat preservation temperature can be controlled by the temperature controller to avoid damage to the bushing or bushing plating caused by overheating. It has the advantages of convenient operation, saving manpower, easy operation, and high efficiency of bushing or bushing installation. It further solves the problems of existing installation methods that cannot control the heating temperature, which will cause insufficient heating of the rudder shaft sleeve and insufficient expansion, or bushing annealing of the inner ring of the bushing due to excessive temperature, resulting in reduced hardness and affecting product quality.
[0027] This heating device uses a 380V three-phase power supply and a delta connection. A temperature switch 4 is connected to the control power supply. When the temperature rises to the operating temperature value, the contacts open / close to cut off / connect the circuit, thereby playing a thermal protection role. When the temperature drops to the reset temperature, the contacts automatically close / open to restore normal operation.
[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A heating device for installation of rudder stock bushing and pintle bushing of a ship, comprising a metal box (1), characterized in that: The metal box (1) is fitted with a bushing shelf (3) inside. The bushing shelf (3) has a through-hole in its inner cavity. The bushing shelf (3) has a support bar on its outer periphery at the bottom. One end of the support bar is fixedly connected to the inner wall of the metal box (1). Three electric heating coils (2) are fixedly installed inside the bottom of the metal box (1). The three electric heating coils (2) are distributed below the bushing shelf (3). The three electric heating coils (2) are connected to a temperature switch (4) through wires. The temperature switch (4) is located on one side of the metal box (1) and is connected to a power cord.
2. A heating device for installation of a rudder stock bushing and a pintle bushing of a marine vessel according to claim 1, characterized in that: The metal box (1) has a prismatic hollow box structure, and pads are fixedly connected to the four corners of the bottom of the metal box (1).
3. A heating device for installation of rudder stock bushing and pintle bushing of a marine vessel according to claim 1, characterized in that: The three electric heating coils (2) are all designed with a "U"-shaped tubular structure, and the three electric heating coils (2) are linearly and uniformly distributed inside the bottom of the metal box (1).
4. A heating device for installation of rudder stock bushing and pintle bushing of a marine vessel according to claim 1, characterized in that: The support bars are provided in four parts, and the four support bars are arranged in a cross shape on the four sides of the bottom periphery of the bushing shelf (3).
5. A heating device for installation of rudder stock bushing and pintle bushing of a marine vessel according to claim 1, characterized in that: The shelf has multiple holes, and the multiple shelf holes are distributed in a matrix in the inner cavity of the bushing shelf (3).