A quick installation device for a freeze bushing

Abstract

The utility model provides a kind of frozen bushing quick installation device, including support frame, its top surface slidingly arranged receiving component;Limiting component is symmetrically rotated and arranged in the both sides of receiving component;Linkage mechanism is equipped between receiving component and limiting component, receiving component is driven limiting component by linkage mechanism when sliding down and is clamped towards rotation bushing;Reset device is equipped between receiving component and support frame, drive receiving component to slide up and reset when releasing down pressure and drive limiting component reverse rotation and release bushing;Receiving component is integrated cold source;Support frame bottom is connected height adjusting component and walking component in proper order;Positioning device is equipped in support frame front end.Linkage mechanism and reset device realize the automatic clamping / release of bushing, avoid visual positioning time-consuming, significantly shorten installation time, prevent assembly failure caused by bushing temperature rise.Crawler walking component adapts complex terrain, scissor type lifting frame accurately adjusts height, improves the stability of device in stern shaft sleeve setting process.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic bushing technology, and specifically to a cryogenic bushing quick installation device. Background Technology

[0002] Cryogenic bushings, also known as shrink-fit bushings or cold-fit bushings, are precision mechanical parts that utilize the principle of thermal expansion and contraction to achieve an interference fit. They are typically used in shaft-bore connections requiring extremely high assembly precision, transmitting large torques, or bearing heavy loads, such as in marine propulsion systems. The inner diameter of a cryogenic bushing is generally slightly smaller than the shaft diameter. It is shrunk using liquid nitrogen or specialized freezing equipment, allowing it to easily fit onto the shaft. Upon heating, the bushing expands, forming a tight, gapless, rigid connection with the shaft.

[0003] Existing refrigeration bushings are mostly positioned visually and then slowly installed onto the ship's stern shaft by hoisting. However, visual positioning is time-consuming, and for refrigeration bushings, the long positioning time can easily cause the bushing to heat up and expand during installation, leading to assembly failure. Reinstallation requires cooling the bushing again, which is energy-intensive and inefficient. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and solve the technical problem that the installation of existing refrigeration bushings takes too long.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A quick installation device for a refrigeration liner includes a support frame, on the top surface of which a receiving component is slidably disposed and moved up and down along the support frame. Limiting components are symmetrically and rotatably disposed on the support frame on the left and right sides of the receiving component. A linkage mechanism is provided between the receiving component and the limiting components. When the receiving component slides downward, the linkage mechanism rotates the limiting components toward the center of the device. A reset device is provided between the receiving component and the support frame. When the downward pressure applied to the receiving component is released, the reset device drives the receiving component to slide upward and reset, and drives the limiting components to rotate in the opposite direction. A cold source is provided in the receiving component. A height adjustment component and a traveling component are sequentially connected to the bottom surface of the support frame. A positioning device is also provided at the front end of the support frame.

[0006] To achieve reliable bushing positioning, efficient force transmission, and precise cold energy transfer, while ensuring operational safety, a preferred technical solution is that the receiving component includes a top plate, a bottom plate, and side plates. A through guide hole is provided at the center of the top plate, through which a pressure-bearing head slides up and down.

[0007] To more clearly illustrate the working state of the reset device, as a preferred technical solution, the reset device includes springs with both ends respectively abutting against the pressure head and the upper surface of the base plate. Specifically, the springs are in a compressed state under normal conditions. A positioning post can be provided on the top surface of the base plate. During installation, the lower end of the spring is fitted onto the positioning post. The top plate is designed to fit the stroke of the pressure head and has blind holes that accommodate the positioning post. Both the pressure head and the base plate, located on the outer periphery of the positioning post, can be provided with annular grooves to engage the end of the spring.

[0008] To achieve adaptive clamping and release of the bushing while ensuring structural reliability in low-temperature environments, a preferred technical solution is provided: the limiting component includes a rotating arm with one end rotatably connected to a support frame, and a limiting claw is provided at the end of the rotating arm away from the support frame. The inner side of the limiting claw can also be machined with an arc-shaped surface to fit the bushing, or connected to a rubber roller, allowing the bushing to rotate relative to the limiting claw.

[0009] To precisely convert the linear motion of the receiving component into the synchronous clamping / releasing action of the limiting claw through rigid body four-bar linkage, and to address the risk of motion jamming in low-temperature environments, the clamping actions on both sides are synchronized. As a preferred technical solution, the linkage mechanism includes a drive arm connecting the receiving component and a rotating shaft connecting the sliding seat. The sliding seat is provided with a sliding groove, and the drive arm is rotatably connected to the sliding groove and slides along the groove.

[0010] To optimize the heat transfer structure while maintaining a low-temperature environment for the refrigeration bushing and reducing the risk of refrigerant leakage, a preferred technical solution is that the cold source includes a refrigerant circulation pipeline installed on the top surface of the base plate. The refrigerant circulation pipeline on the base plate is equipped with heat exchange fins, and heat exchange holes are provided on the top surface of the heat exchange fins and the surface of the top plate. The refrigerant circulation pipeline is connected to a liquid nitrogen storage tank.

[0011] As a preferred technical solution, the cold coal circulation pipeline includes a double-layered insulated hose, and the cavity between the double-layered insulated hose is evacuated.

[0012] In addition, to reduce the risk of heat exchange holes being blocked by condensed ice, the inner wall of the heat exchange holes can also be provided with a full-coverage silane ice-repellent coating.

[0013] As a preferred technical solution, the height adjustment component includes a scissor lift frame, which consists of two sets of X-shaped hinged lifting arms. A crossbeam is provided between the two sets of lifting arms. The upper and lower ends of one side of the scissor lift frame are hinged to the base plate and the traveling component, respectively. The upper and lower ends of the other side are provided with pulleys. An electric push rod is provided on the top surface of the traveling component. The output end of the electric push rod is sleeved onto the crossbeam of the scissor lift frame. The base plate and the traveling component are provided with slots that fit the pulleys. The pulleys slide along the slots when the scissor lift frame is in operation. As a preferred technical solution, the walking component includes a chassis frame, a hinge seat is provided on the top surface of the chassis frame, and two sides of the chassis frame are independently provided with circumferentially toothed drive wheels. Each drive wheel is coaxially connected to the output end of the hub motor, and the teeth are engaged with the track plates.

[0014] As a preferred technical solution, the positioning device includes a connecting beam extending laterally from the support frame. The connecting beam is vertically threaded with an internal gear ring, the axial direction of which is on the radial extension line of the internal gear ring. The internal gear ring is rotatably connected to an annular sleeve through a circumferential groove. The annular sleeve is evenly distributed and rotatably equipped with multiple gears that mesh with the internal gear ring. The gears are radially equipped with positioning claws.

[0015] The advantages and beneficial effects of this utility model are as follows: This device achieves automatic clamping / release of the bushing through a linkage mechanism and a reset device: when the pressure head slides down under force, the drive arm pulls the rotating arm to rotate in opposite directions via the rotating shaft, and the limiting claw clamps the bushing; during release, the spring pushes the pressure head to reset, causing the limiting component to loosen. The cold source system integrates the refrigerant circulation pipeline and the liquid nitrogen storage tank, with liquid nitrogen flowing through the heat exchange fins to maintain the low temperature of the bushing. The walking component adopts a tracked design, independently driven by a hub motor, adapting to complex terrain; the positioning device adjusts the height of the internal gear ring by rotating the thread of the connecting beam, thereby driving the gear to move the positioning claw radially, achieving rapid centering. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the receiving component of this utility model; Figure 3 This is a schematic diagram of the structure of the walking component of this utility model; Figure 4 This is a disassembled structural diagram of the positioning device of this utility model; Figure label: 1-Support frame, 2-Top plate, 3-Bottom plate, 4-Side plate, 5-Guide hole, 6-Pressure head, 7-Spring, 8-Rotating arm, 9-Limiting claw, 10-Rotating shaft, 11-Refrigerant circulation pipeline, 12-Heat exchange plate, 13-Heat exchange hole, 14-Liquid nitrogen storage tank, 15-Scissor lift frame, 16-Lifting arm, 17-Crossbeam, 18-Pulley, 19-Electric push rod, 20-Slot, 21-Chassis frame, 22-Hinged seat, 23-Toothed, 24-Drive wheel, 25-Hub motor, 26-Track plate, 27-Connecting beam, 28-Internal gear ring, 29-Slot, 30-Annular sleeve, 31-Gear, 32-Positioning claw, 33-Drive arm, 34-Sliding seat, 35-Slide groove. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0018] Please see Figures 1-4 This utility model provides a quick installation device for a freezer liner. The support frame 1 is made of a metal frame and is used to support the vertical sliding of the supporting components. A height adjustment component is fixedly connected to the bottom surface of the support frame 1, and a connecting structure extends from the front end for installing a positioning device to ensure overall rigid support.

[0019] The supporting components include a top plate 2, a bottom plate 3, and side plates 4. A through guide hole 5 is machined in the center of the top plate 2, through which the pressure head 6 slides up and down. The bottom plate 3 is fixedly connected to the top plate 2 via the side plates 4, forming a cavity structure. A spring 7 for the reset device is located within the cavity, with its two ends abutting against the bottom surface of the pressure head 6 and the upper surface of the bottom plate 3, respectively. The cold source is integrated into the top surface of the bottom plate 3, ensuring efficient cold transfer.

[0020] The limiting components are symmetrically arranged on the left and right sides of the support frame 1. Each limiting component includes a rotating arm 8 and a limiting claw 9. One end of the rotating arm 8 is rotatably connected to the support frame 1 via a hinge, and the other end is fixed to the limiting claw 9 for clamping the freezing bushing. The limiting claw 9 is made of wear-resistant material and has anti-slip texture on the inner side to prevent the bushing from slipping off.

[0021] The linkage mechanism connects the receiving component and the limiting component, including the rotating shaft 10 that connects the driving arm 33 and the sliding seat 34 of the receiving component. The rotating arm 8 is integrally connected to the sliding seat 34. The sliding seat 34 is provided with a sliding groove 35. The driving arm 33 is rotatably connected to the sliding groove 35 and slides along the sliding groove 35.

[0022] The reset device is spring 7, specifically a compression spring, whose preload ensures that the receiving component maintains its upward sliding reset posture when there is no external force.

[0023] The cold source is integrated into the receiving component, including a refrigerant circulation pipeline. A copper pipe network is installed on the top surface of the base plate 3, and heat exchange fins 12 are welded to the refrigerant circulation pipeline 11 to increase the heat exchange area. Heat exchange holes 13 are provided on the top surface of the heat exchange fins 12 and the surface of the top plate 2. The diameter of the heat exchange holes 13 is 3mm, and the holes are staggered with a spacing of 15mm to facilitate the diffusion of cold air to the bushing. A liquid nitrogen storage tank 14 is connected to the refrigerant circulation pipeline. The cooling circulation pipeline is a double-layered insulated flexible hose. The cavity between the double-layered pipe walls is evacuated to a pressure ≤0.1Pa by a vacuum pump to form an insulation barrier. The vacuum insulation of the flexible hose cavity allows the liquid nitrogen storage tank 14 to be externally mounted or fixed next to the support frame 1, providing a continuous refrigerant supply.

[0024] Among the above technical features, the liquid nitrogen storage tank 14 can also pump cooling capacity to the heat exchange plates via a main body pump. Specifically, liquid nitrogen is pumped by a liquid nitrogen pump (not shown), with the flow rate controlled by a solenoid valve (not shown), or it can be pressurized by liquid nitrogen vaporization and flow by gravity to the heat exchange plates 12. The liquid nitrogen storage tank 14 should also be equipped with a pressure gauge and a safety valve, and heat-resistant gloves should be worn.

[0025] The height adjustment component is a scissor lift frame 15, consisting of two sets of X-shaped hinged lifting arms 16. A crossbeam 17 is fixed between the lifting arms 16. The upper and lower ends of one side of the scissor lift frame 15 are hinged to the base plate and the traveling component, respectively, while pulleys 18 are installed at the upper and lower ends of the other side. An electric push rod 19 is installed on the top surface of the traveling component, and its output end is fitted into the crossbeam 17. The base plate and the traveling component have slots 20, and the pulleys 18 slide along the slots 20 to achieve lifting and lowering. The electric push rod 19 is driven by a controller and can precisely adjust the height of the device.

[0026] The running gear includes a chassis frame 21, with a hinged base 22 welded to the top surface to connect to the height adjustment components. Drive wheels 24 are independently mounted on both sides of the chassis frame 21, each drive wheel 24 having circumferential teeth 23, coaxially connected to the output end of a hub motor 25. The teeth 23 mesh with track plates 26, forming a complete track system. The hub motor 25 can be independently controlled by a controller to achieve forward, backward, and steering maneuvers.

[0027] The positioning device, installed at the front end of the support frame 1, includes a connecting beam 27 extending laterally from the support frame 1. The connecting beam 27 is connected to an internal gear ring via a vertical thread, with the thread axially extending along the radial extension line of the internal gear ring 28. An annular sleeve 30 is rotatably connected to the internal gear ring 28 via a circumferential groove 29 on its outer circumference. Multiple gears 31 are evenly distributed around the circumference of the annular sleeve 30 and mesh with the internal gear ring 28. Each gear 31 has a radially fixed positioning claw for synchronously clamping the stern shaft to achieve centering. When the thread rotates, the height of the internal gear ring can be adjusted up and down. When the annular sleeve and the internal gear ring are rotated coaxially, the rotating gears on the annular sleeve rotate with the internal gear ring, causing the positioning claws 32 to move radially.

[0028] The working principle of this utility model is as follows: the bushing is pre-set on the receiving component, the limiting component is adjusted by the linkage mechanism, and the weight of the bushing causes the pressure head to slide down along the guide hole 5, compressing the spring 7. When the receiving component slides down, the rotating arm 8 is driven to rotate in opposite directions through the rotating shaft 10, and the limiting claw 9 automatically clamps the freezing bushing. The limiting claw 9 is brought into contact with the bushing, completing the centering and clamping work of the bushing. The thread of the positioning device is rotated, and after adjusting the positioning device to be concentric with the bushing, the annular sleeve is fitted onto the end of the stern shaft through the adjustment of the height adjustment component and the traveling component. The annular sleeve 30 is rotated to make the positioning claw 32 clamp with the stern shaft. At the same time, the height adjustment component and the traveling component ensure the concentricity of the annular sleeve of the positioning device with the stern shaft. The bushing is then hoisted off the device, cooled to a contracted state, and placed back on the top plate 2 of the receiving component. The cold source is then activated, and the liquid nitrogen storage tank 14 is opened. The refrigerant circulates through the refrigerant circulation pipeline 11, and the cooling capacity is transferred through the heat exchange fins 12 and heat exchange holes 13 to maintain the bushing temperature. The wheel hub motor 25 of the traveling component drives the track plates 26 to move the device along the axial direction of the ship's stern shaft, so that the refrigeration bushing is fitted onto the stern shaft.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A quick-installation device for a refrigeration liner, comprising a support frame (1), characterized in that, A receiving component is provided on the top surface of the support frame (1) and slides up and down along it. Limiting components are symmetrically and rotatably mounted on the support frame (1) on the left and right sides of the receiving component. A linkage mechanism is provided between the receiving component and the limiting component. When the receiving component slides down, the linkage mechanism rotates the limiting component toward the center of the device. A reset device is provided between the receiving component and the support frame (1). When the downward pressure applied to the receiving component is released, the reset device drives the receiving component to slide up and reset, and drives the limiting component to rotate in the opposite direction. A cold source is provided in the receiving component. A height adjustment component and a walking component are connected in sequence on the bottom surface of the support frame (1). A positioning device is also provided at the front end of the support frame (1).

2. The quick installation device for the refrigeration bushing according to claim 1, characterized in that, The receiving component includes a top plate (2), a bottom plate (3) and a side plate (4). A through guide hole (5) is provided at the center of the top plate (2), and a pressure head (6) is provided to slide up and down through the guide hole (5).

3. The quick installation device for refrigeration bushings according to claim 1, characterized in that, The reset device includes springs (7) with their two ends abutting against the upper surfaces of the pressure head (6) and the base plate (3), respectively.

4. The quick installation device for the refrigeration bushing according to claim 1, characterized in that, The limiting component includes a rotating arm (8) with one end rotatably connected to the support frame (1), and a limiting claw (9) is provided at the end of the rotating arm (8) away from the support frame (1).

5. The quick-installation device for refrigeration bushings according to claim 1, characterized in that, The linkage mechanism includes a rotating shaft (10) connecting the drive arm (33) of the receiving component and the sliding seat (34). The sliding seat (34) is provided with a sliding groove (35). The drive arm (33) is rotatably connected to the sliding groove (35) and slides along the sliding groove (35).

6. The quick-installation device for refrigeration bushings according to claim 1, characterized in that, The cold source includes a refrigerant circulation pipe (11) installed on the top surface of the base plate (3). The refrigerant circulation pipe (11) on the base plate (3) is equipped with heat exchange plates (12). Heat exchange holes (13) are opened on the top surface of the heat exchange plates (12) and the surface of the top plate (2). The refrigerant circulation pipe (11) is connected to a liquid nitrogen storage tank (14).

7. The quick-installation device for refrigeration bushings according to claim 6, characterized in that, The refrigerant circulation pipeline (11) includes a double-insulated hose, and the cavity between the double-insulated hose is evacuated.

8. The quick-installation device for refrigeration bushings according to claim 1, characterized in that, The height adjustment component includes a scissor lift frame (15), which is composed of two sets of X-shaped hinged lifting arms (16). A crossbeam (17) is provided between the two sets of lifting arms (16). The upper and lower ends of one side of the scissor lift frame (15) are hinged to the base plate (3) and the traveling component, respectively. The upper and lower ends of the other side are provided with pulleys (18). An electric push rod (19) is provided on the top surface of the traveling component. The output end of the electric push rod (19) is sleeved on the crossbeam (17) of the scissor lift frame (15). The base plate (3) and the traveling component are provided with slots (20) that are adapted to the pulleys (18). The pulleys (18) slide along the slots (20) when the scissor lift frame (15) is working.

9. The quick-installation device for refrigeration bushings according to claim 1, characterized in that, The walking component includes a chassis frame (21), with a hinge seat (22) on the top surface of the chassis frame (21). Two sides of the chassis frame (21) are independently provided with drive wheels (24) with circumferential teeth (23). Each drive wheel (24) is coaxially connected to the output end of a hub motor (25), and the teeth (23) are engaged with the track plates (26).

10. The quick-installation device for refrigeration bushings according to claim 1, characterized in that, The positioning device includes a connecting beam (27) extending laterally from the support frame (1). The connecting beam (27) is vertically threaded with an internal gear ring (28). The axial direction of the thread is on a radial extension line outside the internal gear ring (28). The internal gear ring (28) is rotatably connected to an annular sleeve (30) through a circumferential groove (29). The annular sleeve (30) is evenly distributed around the circumference and rotatably provided with multiple gears (31) that mesh with the internal gear ring (28). The gears (31) are radially provided with positioning claws (32).

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