Rudder system resin bushing freezing hoisting device and method

Abstract

The invention discloses a rudder system resin bushing freezing and hoisting device which comprises an air pressure adjusting module, a bushing bearing and fixing module and a hoisting module, the air pressure adjusting module is used for adjusting the connecting position between the bushing bearing and fixing module and a resin bushing, and the air pressure adjusting module is installed in the hoisting module; the air pressure adjusting module comprises a two-way air pressure type piston module, a first compressed air pipe and a second compressed air pipe, the lining bearing and fixing module comprises a lining bracket and a lining pressing plate, and the two-way air pressure type piston module comprises an air pressure type sliding groove and an air pressure type plunger. The air pressure mode is adopted, adjustment and control over the fixing pressure of the resin bushings can be achieved according to the specifications and technical requirements of various types of resin bushings, influences of low temperature are avoided, and the product quality safety in the resin bushing hoisting process is effectively guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of shipbuilding, and particularly relates to a freezing hoisting device and method for a rudder system resin bushing. Background Art

[0002] The installation of the rudder system is a key and important item in the shipbuilding process. As Figure 8 and Figure 9 shown, for the bearing resin bushing in the form of a cast steel piece of the hanging rudder arm, after the bore of the bearing cast steel piece is bored, the resin bushing needs to be processed according to the bore data. After the resin bushing is processed, it needs to be frozen, and then hoisted from above into place, and then placed into the bearing with the bore processed as required.

[0003] With the development of shipbuilding technology, higher requirements are put forward for the operation standardization and safety reliability in the shipbuilding process, which also reflects the technological level of shipbuilding. At present, resin bushings are generally used to replace metal bushings in the ship rudder system, and the installation of the rudder system resin bushing is realized by installing it into the rudder system bearing after freezing and shrinking. Generally, the freezing of the rudder system resin bushing is to place it in a freezing box and then add a freezing medium. Now, dry ice or liquid nitrogen is generally selected as the freezing medium, and after cooling, it is taken out of the freezing box. Therefore, the bushing needs to be tied with ropes before freezing. After being taken out of the freezing box and hoisted to the installation position, the ropes tied during the freezing and hoisting of the bushing need to be untied before it can be installed in the predetermined position. Due to the lack of a standardized and reliable hoisting tool, frostbite incidents of operators often occur to varying degrees. Although some hoisting tools have been made, since the shrinkage amount of the resin bushing during the freezing process is a dynamic process and it is not easy to hoist and fix. If the resin bushing is fixed in advance, there is a risk of cracking during freezing and shrinking.

[0004] Patent No.: ZL201621433850.1, a freezing hoisting tool for installing a ship rudder system resin bushing, realizes the shrinkage positioning of the resin bushing during the freezing process by adopting the structure of a wedge block. However, it cannot generate a fixing force on the resin bushing and only maintains a state. In case of sudden situations such as collisions, it is easy to fall off. More importantly, after the device is hoisted in place, the bracket is pressed between the resin bushing and the lower bushing baffle, and the automatic shrinkage and removal function cannot be realized. It is still necessary to manually disassemble the structure of the wedge block under the frozen state to complete the installation of the bushing on the baffle. Although the non-contact operation of the frozen bushing hoisting process is realized, there is still a great frostbite safety risk in the device removal link. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies existing in the above-mentioned prior art, and to provide a freezing hoisting device and method for a rudder system resin bushing. The device and method of the present invention can, by adopting a pneumatic method, adjust and control the fixed pressure of the resin bushing according to the specifications and technical requirements of various types of resin bushings, and are not affected by low temperature, effectively ensuring the product quality and safety during the hoisting process of the resin bushing.

[0006] In order to achieve the above-mentioned invention object, the technical solution provided by the present invention patent is as follows:

[0007] A freezing hoisting device for a rudder system resin bushing, the device includes a pneumatic pressure adjustment module, a bushing bearing and fixing module, and a hoisting module. The pneumatic pressure adjustment module is used to adjust the connection position between the bushing bearing and fixing module and the resin bushing, and the pneumatic pressure adjustment module is installed in the hoisting module; the pneumatic pressure adjustment module includes a two-way pneumatic piston module, a first compressed air pipe and a second compressed air pipe. The bushing bearing and fixing module includes a bushing bracket and a bushing pressing plate. The two-way pneumatic piston module includes a pneumatic chute and a pneumatic plunger. An air cavity is arranged inside the pneumatic chute, and the pneumatic plunger is installed in the air cavity. One end of the pneumatic chute is provided with a bottom compressed air pipe interface, the pneumatic chutes are symmetrically arranged, and the bottom compressed air pipe interfaces of the two pneumatic chutes are respectively communicated with the first compressed air pipe. The other end side of the pneumatic chute is provided with a side compressed air pipe interface, and the side compressed air pipe interfaces of the two pneumatic chutes are respectively communicated with the second compressed air pipe. One end of the pneumatic plunger is inserted into the pneumatic chute, and the other end of the pneumatic plunger is connected to the bushing bracket. The bushing bracket supports the bottom of the resin bushing, and the bushing pressing plate is installed on the top of the resin bushing; two two-way pneumatic piston modules are arranged in the hoisting module.

[0008] Furthermore, the hoisting module includes a hoisting cylinder body, the hoisting cylinder body is integrally in the shape of a hollow cylinder, a plurality of lifting lugs are evenly arranged at the upper end of the hoisting cylinder body, four chute mounting holes are evenly arranged on the side surface at the lower end of the hoisting cylinder body, one end of the pneumatic chute faces the center of the bottom of the hoisting cylinder body, and the other end of the pneumatic chute extends out from the chute mounting hole.

[0009] Furthermore, when the pneumatic chute is installed, the end provided with the bottom compressed air pipe interface faces the center of the bottom of the hoisting cylinder body; the bottom compressed air pipe interfaces of the pneumatic chutes are respectively communicated with the first compressed air pipe; the side compressed air pipe interfaces of the pneumatic chutes are respectively communicated with the second compressed air pipe. One end of the pneumatic chute without the bottom compressed air pipe interface is provided with a chute cover plate, and a positioning hole is arranged in the middle of the chute cover plate, and a positioning collar is installed in the positioning hole.

[0010] Further, the positioning collar is integrally a hollow cylindrical shape. One end of the positioning collar extends into the air chamber of the pneumatic chute, and the other end of the positioning collar extends out of the positioning hole. The pneumatic plunger is integrally a cylindrical shape. One end of the pneumatic plunger is provided with a threaded hole, and the other end of the pneumatic plunger is provided with a sealing ring. When the pneumatic plunger is installed, the end of the pneumatic plunger with the sealing ring faces the bottom compressed air pipe interface, and the end of the pneumatic plunger with the threaded hole passes through the positioning collar and extends out of the pneumatic chute.

[0011] Further, the diameter of the end of the pneumatic plunger with the sealing ring is equal to the inner diameter of the air chamber of the pneumatic chute, the diameter of the end of the pneumatic plunger with the threaded hole is equal to the inner diameter of the positioning collar, and the outer diameter of the positioning collar is smaller than the inner diameter of the air chamber of the pneumatic chute.

[0012] Further, the first compressed air pipe and the second compressed air pipe are arranged in parallel along the hoisting cylinder in the middle of the hoisting cylinder, and the first compressed air pipe and the second compressed air pipe extend out of the upper end of the hoisting cylinder; a fixed inflation valve, a pneumatic pressure regulating valve and a pressure gauge are sequentially installed on the upper part of the first compressed air pipe, and a detachable inflation valve is installed on the upper part of the second compressed air pipe.

[0013] Further, the bushing bracket includes a connecting rod and an adjusting bracket. One end of the connecting rod is threadedly connected to the pneumatic plunger, and the other end of the connecting rod is threadedly connected to the adjusting bracket. The adjusting bracket is integrally an L shape. One end of the adjusting bracket is vertically connected to the connecting rod, and the other end of the adjusting bracket is horizontally arranged.

[0014] Further, the bushing pressing plate includes a pressing plate and pressing plate strips. A through hole is provided in the middle of the pressing plate, a connecting cylinder is provided on the through hole, a plurality of pressing plate strips are uniformly arranged on the lower end face of the pressing plate. The pressing plate strips are integrally rectangular parallelepiped shapes. A strip-shaped hole is provided in the middle of the pressing plate strip, and the strip-shaped hole of the pressing plate strip is bolted to the pressing plate, and the pressing plate strips are radially arranged on the pressing plate.

[0015] A method for cryogenic hoisting of a rudder system resin bushing, the method specifically includes the following steps:

[0016] S1, Prepare a cryogenic hoisting device for a rudder system resin bushing. The device includes a pneumatic pressure regulating module, a bushing bearing and fixing module, and a hoisting module. The pneumatic pressure regulating module is used to adjust the connection position between the bushing bearing and fixing module and the resin bushing. The pneumatic pressure regulating module is installed in the hoisting module; the pneumatic pressure regulating module includes a two-way pneumatic piston module, a first compressed air pipe and a second compressed air pipe, and the bushing bearing and fixing module includes a bushing bracket and a bushing pressing plate;

[0017] S2. Adjust the protruding position of the bushing bracket according to the inner diameter size of the resin bushing. Place the resin bushing axially on the hoisting cylinder. The bottom of the resin bushing is placed on the adjusting bracket. The horizontal end of the adjusting bracket supports the bottom of the resin bushing, and the vertical end of the adjusting bracket is connected to the inner wall of the resin bushing.

[0018] S3. After the resin bushing is installed, open the fixed inflation valve and the disassembly inflation valve. Inflate the pneumatic chute through the fixed inflation valve. The pneumatic plunger moves towards the inner wall of the resin bushing, making the adjusting bracket tightly connected to the inner wall of the resin bushing.

[0019] S4. When the pressure gauge value on the first compressed air pipe shows that it reaches the rated pressure value, close the fixed inflation valve, and at the same time keep the disassembly inflation valve open, and set the pressure of the pressure relief regulating valve on the first compressed air pipe according to the fixed pressure value.

[0020] S5. Install the bushing pressing plate on the upper end of the resin bushing. Adjust the protruding length of the pressing plate strip according to the diameter of the resin bushing, so that the protruding length of the pressing plate strip is less than the outer diameter of the resin bushing. Hoist the resin bushing into the freezing chamber cylinder through the hoisting cylinder.

[0021] S6. Inject the freezing medium into the freezing chamber to completely immerse the resin bushing in the freezing medium. Cover the freezing chamber lid. After the resin bushing is frozen by the freezing medium, the resin bushing shrinks after freezing, and the inner wall of the resin bushing squeezes the adjusting bracket towards the center direction of the hoisting cylinder.

[0022] S7. The adjusting bracket drives the pneumatic plunger in the pneumatic chute to squeeze the compressed air. When the gas pressure value in the second compressed air pipe reaches the release pressure of the pressure relief regulating valve, the pressure release valve automatically opens to release the air pressure. When the gas pressure value in the second compressed air pipe is less than the release pressure of the pressure relief regulating valve, the pressure release valve closes.

[0023] S8. After the freezing is completed, open the freezing chamber lid. Hoist the resin bushing through the hoisting device. Place the whole resin bushing above the machined bearing of the rudder stock casting into the bearing. After the resin bushing is installed in place, open the fixed inflation valve and inflate the second compressed air pipe through the disassembly inflation valve.

[0024] S9. The compressed air in the second compressed air pipe enters the air chamber in the pneumatic chute between the sealing ring and the adjusting bracket through the side compressed air pipe interface, and pushes the pneumatic plunger towards the center of the hoisting cylinder, making the adjusting bracket contract, so that the adjusting bracket separates from the bottom of the resin bushing and enters the central through hole of the resin bushing. Then hoist the hoisting device out of the resin bushing to complete the freezing and installation of the resin bushing.

[0025] Furthermore, the height of the hoisting cylinder is greater than the height of the inner wall of the freezing chamber.

[0026] Based on the above technical solution, the following technical advantages have been achieved through practical application of a freezing hoisting device and method for a rudder system resin bushing in this invention patent:

[0027] 1. By adopting a pneumatic method, the method for freezing hoisting a rudder system resin bushing in this invention can adjust and control the fixed pressure of the resin bushing according to the specifications and technical requirements of various types of resin bushings, and is not affected by low temperature, effectively ensuring the product quality and safety during the hoisting process of the resin bushing.

[0028] 2. The method for freezing hoisting a rudder system resin bushing in this invention adopts a two-way pneumatic piston structure, which solves the release of the freezing shrinkage stress of the resin bushing, and can also meet the hoisting fixation and disassembly after hoisting of the resin bushing, ensuring the product quality and operation safety of the resin bushing during the freezing process.

[0029] 3. By adopting the resin bushing hoisting device in the method for freezing hoisting a rudder system resin bushing in this invention, it can meet the hoisting fixation requirements of various types of resin bushings through pressure adjustment according to the fixed pressure requirements of various types of resin bushings; it also realizes the automatic disassembly function after the resin bushing is hoisted in place, avoiding manual intervention operations after the rudder system resin bushing is frozen, ensuring the reliability of the bushing fastening, guaranteeing the operation safety of construction personnel, simultaneously compressing the operation process, with simple operation, improving the construction efficiency, and having a large adjustment range of the device, showing general applicability. Description of the Drawings

[0030] Figure 1 is the structure diagram of the freezing and hoisting device in a freezing hoisting device for a rudder system resin bushing in this invention.

[0031] Figure 2 is the structure diagram of the pneumatic plunger in a freezing hoisting device for a rudder system resin bushing in this invention.

[0032] Figure 3 is the structure diagram of the adjusting bracket in a freezing hoisting device for a rudder system resin bushing in this invention.

[0033] Figure 4 is the structure diagram of the pneumatic chute in a freezing hoisting device for a rudder system resin bushing in this invention.

[0034] Figure 5 is the three-dimensional assembly diagram of the pneumatic chute and the pneumatic piston in a freezing hoisting device for a rudder system resin bushing in this invention.

[0035] Figure 6 is the structure diagram of the pressing plate in a freezing hoisting device for a rudder system resin bushing in this invention.

[0036] Figure 7It is a structural diagram of a pressing strip in a freezing hoisting device for a rudder system resin bushing according to the present invention.

[0037] Figure 8 It is a schematic diagram of a cast steel piece of a hanging rudder arm in a freezing hoisting device for a rudder system resin bushing according to the present invention.

[0038] Figure 9 It is a schematic diagram of the installation position of a resin bushing in a freezing hoisting device for a rudder system resin bushing according to the present invention. Specific embodiments

[0039] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific examples shown in the drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0040] As Figures 1-9 shown, a freezing hoisting device for a rudder system resin bushing, the device includes a pneumatic pressure adjustment module, a bushing bearing and fixing module, and a hoisting module. The pneumatic pressure adjustment module is used to adjust the connection position between the bushing bearing and fixing module and the resin bushing 9. The hoisting module is internally installed with the pneumatic pressure adjustment module. The pneumatic pressure adjustment module includes a two-way pneumatic piston module, a first compressed air pipe 3 and a second compressed air pipe 4. The bushing bearing and fixing module includes a bushing bracket 2 and a bushing pressing plate 6. The two-way pneumatic piston module includes a pneumatic chute 1 and a pneumatic plunger 8. An air cavity is provided inside the pneumatic chute 1, and the pneumatic plunger 8 is installed in the air cavity. One end of the pneumatic chute 1 is provided with a bottom compressed air pipe interface 11. The pneumatic chutes 1 are symmetrically arranged, and the bottom compressed air pipe interfaces 11 of the two pneumatic chutes 1 are respectively communicated with the first compressed air pipe 3. The other end side of the pneumatic chute 1 is provided with a side compressed air pipe interface 12, and the side compressed air pipe interfaces 12 of the two pneumatic chutes 1 are respectively communicated with the second compressed air pipe 4. One end of the pneumatic plunger 8 is inserted into the pneumatic chute 1, and the other end of the pneumatic plunger 8 is connected to the bushing bracket 2. The bushing bracket 2 supports the bottom of the resin bushing 9, and the bushing pressing plate 6 is installed on the top of the resin bushing 9. Two two-way pneumatic piston modules are provided inside the hoisting module.

[0041] The hoisting module includes a hoisting cylinder body 7. The hoisting cylinder body 7 is integrally in the shape of a hollow cylinder. A plurality of lifting lugs are uniformly arranged at the upper end of the hoisting cylinder body 7. Four chute mounting holes are uniformly arranged on the side surface of the lower end of the hoisting cylinder body 7. One end of the pneumatic chute 1 faces the center of the bottom of the hoisting cylinder body 7, and the other end of the pneumatic chute 1 extends out from the chute mounting hole.

[0042] As Figure 4As shown, when the pneumatic chute 1 is installed, one end of the bottom compressed air pipe interface 11 faces the center of the bottom of the hoisting cylinder 7; the bottom compressed air pipe interfaces 11 of the pneumatic chute 1 are respectively connected to the first compressed air pipe 3; the side compressed air pipe interfaces 12 of the pneumatic chute 1 are respectively connected to the second compressed air pipe 4. One end of the pneumatic chute 1 without the bottom compressed air pipe interface 11 is provided with a chute cover plate 13, and a positioning hole is provided in the middle of the chute cover plate 13, and a positioning collar 14 is installed in the positioning hole.

[0043] The positioning collar 14 is integrally in the shape of a hollow cylinder. One end of the positioning collar 14 extends into the air cavity of the pneumatic chute 1, and the other end of the positioning collar 14 extends out of the positioning hole. The pneumatic plunger 8 is integrally in the shape of a cylinder. One end of the pneumatic plunger 8 is provided with a screw hole, and the other end of the pneumatic plunger 8 is provided with a sealing ring 81. When the pneumatic plunger 8 is installed, the end of the pneumatic plunger 8 with the sealing ring 81 faces the bottom compressed air pipe interface 11, and the end of the pneumatic plunger 8 with the screw hole passes through the positioning collar 14 and extends out of the pneumatic chute 1.

[0044] As Figure 5 shown, the diameter of one end of the sealing ring 81 of the pneumatic plunger 8 is equal to the inner diameter of the air cavity of the pneumatic chute 1, the diameter of the end of the pneumatic plunger 8 with the screw hole is equal to the inner diameter of the positioning collar 14, and the outer diameter of the positioning collar 14 is smaller than the inner diameter of the air cavity of the pneumatic chute 1; the positioning collar 14 is used to ensure the extension range when the plunger advances and presses the fixing bushing, so that the sealing ring does not exceed the position of the disassembly compressed air joint on the piston groove.

[0045] The first compressed air pipe 3 and the second compressed air pipe 4 are arranged in parallel along the hoisting cylinder 7 in the middle of the hoisting cylinder 7, and the first compressed air pipe 3 and the second compressed air pipe 4 extend out of the upper end of the hoisting cylinder 7; a fixed inflation valve, a pressure regulating valve and a pressure gauge are sequentially installed on the upper part of the first compressed air pipe 3, and a disassembly inflation valve is installed on the upper part of the second compressed air pipe 4.

[0046] The bushing bracket 2 includes a connecting rod 21 and an adjusting bracket 22. One end of the connecting rod 21 is threadedly connected to the pneumatic plunger 8, and the other end of the connecting rod 21 is threadedly connected to the adjusting bracket 22. The adjusting bracket 22 is integrally in the shape of an L. One end of the adjusting bracket 22 is vertically connected to the connecting rod 21, and the other end of the adjusting bracket 22 is horizontally arranged.

[0047] The bushing pressing plate 6 includes a pressing plate 61 and pressing plate strips 62. A through hole is provided in the middle of the pressing plate 61, and a connecting cylinder is provided on the through hole. A plurality of pressing plate strips 62 are evenly arranged on the lower end face of the pressing plate 61. The pressing plate strips 62 are integrally in the shape of a cuboid. A strip-shaped hole is provided in the middle of the pressing plate strips 62. The strip-shaped holes of the pressing plate strips 62 are bolted to the pressing plate 61, and the pressing plate strips 62 are radially arranged on the pressing plate 61.

[0048] The pressing plate 61 is a steel ring pressing plate, which is used to prevent the side tilt that may be caused by the hoisting swing. Four pairs of mounting holes for the detachable pressing plate strips 62 are provided on the pressing plate 61 to prevent the outer diameter of the pressing plate 61 from being larger than that of the resin bushing 9 and unable to be directly hoisted in place, and at the same time, resin bushings 9 of various specifications can be used; in order to enable the pressing plate 61 to meet the requirements of bushings of various specifications, pressing plate strips 62 are provided on the pressing plate 61. The pressing plate strip 62 is a rectangular piece with an adjustable groove in the middle and a telescopic adjusting block, which can be fixed on the pressing plate 61 with bolts. Its function is to prevent the side tilt that may be caused by the hoisting swing, meet the dimensions of resin bushings 9 of various specifications, so that the pressing plate strip 62 presses the bushing without exceeding the outer diameter of the bushing, ensuring that the bushing can be directly hoisted in place.

[0049] A method for cryogenic hoisting of a rudder system resin bushing, which specifically includes the following steps:

[0050] S1. Prepare a cryogenic hoisting device for a rudder system resin bushing. The device includes a pneumatic pressure adjustment module, a bushing bearing and fixing module, and a hoisting module. The pneumatic pressure adjustment module is used to adjust the connection position between the bushing bearing and fixing module and the resin bushing 9, and the pneumatic pressure adjustment module is installed in the hoisting module; the pneumatic pressure adjustment module includes a two-way pneumatic piston module, a first compressed air pipe 3 and a second compressed air pipe 4, and the bushing bearing and fixing module includes a bushing bracket 2 and a bushing pressing plate 6.

[0051] S2. According to the inner diameter of the resin bushing 9, adjust the protruding position of the bushing bracket 2, place the resin bushing 9 along the axial direction, put it on the hoisting cylinder 7, place the bottom of the resin bushing 9 on the adjusting bracket 22, the horizontal end of the adjusting bracket 22 supports the bottom of the resin bushing 9, and the vertical end of the adjusting bracket 22 is connected to the inner wall of the resin bushing 9.

[0052] S3. After the resin bushing 9 is installed, open the fixed inflation valve and the disassembly inflation valve, inflate the pneumatic chute 1 through the fixed inflation valve, and the pneumatic plunger 8 moves towards the inner wall of the resin bushing 9 to make the adjusting bracket 22 tightly connected to the inner wall of the resin bushing 9.

[0053] S4. When the pressure gauge value on the first compressed air pipe 3 shows that it reaches the rated pressure value, close the fixed inflation valve, and at the same time keep the disassembly inflation valve open, and set the pressure of the pressure relief regulating valve on the first compressed air pipe 3 according to the fixed pressure value.

[0054] S5. Install the bushing pressing plate 6 on the upper end of the resin bushing 9, adjust the protruding length of the pressing plate strip 62 according to the diameter of the resin bushing 9, so that the protruding length of the pressing plate strip 62 is less than the outer diameter of the resin bushing 9; hoist the resin bushing 9 into the freezer cylinder 51 through the hoisting cylinder 7.

[0055] S6 Inject the freezing medium into the freezer, completely submerge the resin bushing 9 in the freezing medium, cover the freezer lid 52. After the resin bushing 9 is frozen by the freezing medium, the resin bushing 9 shrinks after freezing, and the inner wall of the resin bushing 9 squeezes the adjusting bracket 22 towards the center direction of the lifting cylinder 7;

[0056] S7, the adjusting bracket 22 drives the pneumatic plunger 8 in the pneumatic chute 1 to squeeze the compressed air. When the gas pressure value in the second compressed air pipe 4 reaches the release pressure of the pressure relief regulating valve, the pressure relief valve automatically opens to release the air pressure; when the gas pressure value in the second compressed air pipe 4 is less than the release pressure of the pressure relief regulating valve, the pressure relief valve closes;

[0057] S8, after the freezing is completed, open the freezer lid, lift the resin bushing 9 through the lifting device, and place the whole resin bushing 9 above the bored rudder arm cast steel part and into the bearing. After the resin bushing 9 is installed in place, open the fixed inflation valve and inflate the second compressed air pipe 4 through the disassembly inflation valve;

[0058] The freezer cylinder body and the freezer lid form the heat preservation body of the freezer. The inner and outer walls of the freezer cylinder body and the freezer lid are made of steel materials, and heat preservation materials are installed between the inner and outer walls, so that the whole rudder system resin bushing 9 can be placed inside for freezing and heat preservation; a through hole is provided in the middle of the freezer lid to facilitate the extension of the lifting device;

[0059] S9, the compressed air in the second compressed air pipe 4 enters the air cavity in the pneumatic chute 1 between the sealing ring 81 and the adjusting bracket 22 through the side compressed air pipe interface 12, and pushes the pneumatic plunger 8 to move towards the center of the lifting cylinder 7, so that the adjusting bracket 22 shrinks, and the adjusting bracket 22 separates from the bottom of the resin bushing 9 and enters the central through hole of the resin bushing 9; then lift the lifting device from the resin bushing 9 to complete the freezing and installation of the resin bushing 9.

[0060] The height of the lifting cylinder 7 is greater than the height of the inner wall of the freezer.

[0061] The present invention adopts a two-way pneumatic piston structure, which solves the release of the freezing shrinkage stress of the resin bushing 9, and can also meet the lifting and fixing of the resin bushing 9 and the disassembly after lifting, ensuring the product quality and operation safety of the resin bushing 9 during the freezing process; combining the freezing and lifting of the resin bushing 9 realizes the freezing and lifting work of the resin bushing 9 by the same device.

[0062] The technical solution of the present invention not only solves the problem of the shrinkage amount of the resin bushing 9 during the freezing process while ensuring the fixing force on the bushing, improves the reliability of the device, but also realizes the function that the bushing bracket can automatically shrink and disassemble, improves the construction efficiency of freezing and hoisting, shortens the operation time of the freezing process, can directly carry out hoisting and disassembling, improves the safety and efficiency of the installation process. The key is that it can be based on the parameter status of resin bushings 9 of various specifications, and realizes the adjustment and control of the fixing force of the resin bushing 9 to ensure the fixing safety during the installation process; and after the resin bushing 9 is installed in place, the fixing bracket of the resin bushing 9 can automatically shrink and disassemble, realizing the non-interference operation during the installation process after the resin bushing 9 is frozen, and avoiding the hidden danger of operation frostbite.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered by the scope of the technical solutions claimed in the present invention.

Claims

1. A freezing hoisting device for a rudder system resin bushing, characterized in that, The device includes a pneumatic pressure adjustment module, a bushing bearing and fixing module, and a hoisting module. The pneumatic pressure adjustment module is used to adjust the connection position between the bushing bearing and fixing module and the resin bushing. The pneumatic pressure adjustment module is installed in the hoisting module. The pneumatic pressure adjustment module includes a two-way pneumatic piston module, a first compressed air pipe and a second compressed air pipe. The bushing bearing and fixing module includes a bushing bracket and a bushing pressing plate. The two-way pneumatic piston module includes a pneumatic chute and a pneumatic plunger. An air cavity is provided inside the pneumatic chute, and the pneumatic plunger is installed in the air cavity. A bottom compressed air pipe interface is provided at one end of the pneumatic chute. The pneumatic chutes are symmetrically arranged, and the bottom compressed air pipe interfaces of the two pneumatic chutes are respectively communicated with the first compressed air pipe. A side compressed air pipe interface is provided on the side of the other end of the pneumatic chute. The side compressed air pipe interfaces of the two pneumatic chutes are respectively communicated with the second compressed air pipe. One end of the pneumatic plunger is inserted into the pneumatic chute, and the other end of the pneumatic plunger is connected to the bushing bracket. The bushing bracket supports the bottom of the resin bushing, and the bushing pressing plate is installed on the top of the resin bushing. Two two-way pneumatic piston modules are provided in the hoisting module.

2. The cryogenic hoisting device for the rudder system resin bushing according to claim 1, characterized in that, The hoisting module includes a hoisting cylinder body. The hoisting cylinder body is a hollow cylinder as a whole. A plurality of lifting lugs are evenly provided at the upper end of the hoisting cylinder body. Four chute mounting holes are evenly provided on the side of the lower end of the hoisting cylinder body. One end of the pneumatic chute faces the center of the bottom of the hoisting cylinder body, and the other end of the pneumatic chute extends out from the chute mounting hole.

3. The cryogenic hoisting device for the rudder system resin bushing according to claim 2, characterized in that, When the pneumatic chute is installed, the end provided with the bottom compressed air pipe interface faces the center of the bottom of the hoisting cylinder body. The bottom compressed air pipe interfaces of the pneumatic chutes are respectively communicated with the first compressed air pipe. The side compressed air pipe interfaces of the pneumatic chutes are respectively communicated with the second compressed air pipe. A chute cover plate is provided at one end of the pneumatic chute without the bottom compressed air pipe interface. A positioning hole is provided in the middle of the chute cover plate, and a positioning collar is installed in the positioning hole.

4. A freezing hoisting device for a rudder system resin bushing according to claim 3, characterized in that, The positioning collar is a hollow cylinder as a whole. One end of the positioning collar extends into the air cavity of the pneumatic chute, and the other end of the positioning collar extends out from the positioning hole. The pneumatic plunger is a cylinder as a whole. A threaded hole is provided at one end of the pneumatic plunger, and a sealing ring is provided at the other end of the pneumatic plunger. When the pneumatic plunger is installed, the end of the pneumatic plunger provided with the sealing ring faces the bottom compressed air pipe interface, and the end of the pneumatic plunger provided with the threaded hole passes through the positioning collar and extends out of the pneumatic chute.

5. A freezing hoisting device for a rudder system resin bushing according to claim 4, characterized in that, The diameter of the end of the pneumatic plunger with the sealing ring is equal to the inner diameter of the air cavity of the pneumatic chute. The diameter of the end of the pneumatic plunger with the threaded hole is equal to the inner diameter of the positioning collar. The outer diameter of the positioning collar is smaller than the inner diameter of the air cavity of the pneumatic chute.

6. The freezing hoisting device for the rudder system resin bushing according to claim 1, characterized in that The first compressed air pipe and the second compressed air pipe are arranged parallel to the hoisting cylinder body in the middle of the hoisting cylinder body. The first compressed air pipe and the second compressed air pipe extend out of the upper end of the hoisting cylinder body. A fixed inflation valve, a pneumatic pressure regulating valve and a pressure gauge are sequentially installed on the upper part of the first compressed air pipe. A disassembly inflation valve is installed on the upper part of the second compressed air pipe.

7. A freezing hoisting device for a rudder system resin bushing according to claim 1, characterized in that, The bushing bracket includes a connecting rod and an adjusting bracket. One end of the connecting rod is threadedly connected to a pneumatic plunger, and the other end of the connecting rod is threadedly connected to the adjusting bracket. The adjusting bracket is L-shaped as a whole. One end of the adjusting bracket is vertically connected to the connecting rod, and the other end of the adjusting bracket is horizontally arranged.

8. The cryogenic lifting device for the rudder system resin bushing according to claim 1, characterized in that, The bushing pressing plate includes a pressing plate and pressing plate strips. A through hole is provided in the middle of the pressing plate, and a connecting cylinder is provided on the through hole. A plurality of pressing plate strips are evenly arranged on the lower end face of the pressing plate. The pressing plate strips are rectangular parallelepipeds as a whole. A strip hole is provided in the middle of the pressing plate strips. The strip holes of the pressing plate strips are bolt-connected to the pressing plate, and the pressing plate strips are radially arranged on the pressing plate.

9. A method for cryogenic hoisting of a resin bushing for a rudder system, characterized in that, The method specifically includes the following steps: S1. Prepare a freezing hoisting device for a rudder system resin bushing. The device includes a pneumatic adjustment module, a bushing bearing and fixing module, and a hoisting module. The pneumatic adjustment module is used to adjust the connection position between the bushing bearing and fixing module and the resin bushing. The pneumatic adjustment module is installed in the hoisting module. The pneumatic adjustment module includes a two-way pneumatic piston module, a first compressed air pipe and a second compressed air pipe. The bushing bearing and fixing module includes a bushing bracket and a bushing pressing plate. S2. According to the inner diameter size of the resin bushing, adjust the extending position of the bushing bracket. Place the resin bushing along the axial direction and sleeved on the hoisting cylinder. The bottom of the resin bushing is placed on the adjusting bracket. The horizontal end of the adjusting bracket supports the bottom of the resin bushing, and the vertical end of the adjusting bracket is connected to the inner wall of the resin bushing. S3. After the resin bushing is installed, open the fixed inflation valve and the disassembly inflation valve. Inflate the pneumatic chute through the fixed inflation valve, and the pneumatic plunger moves towards the inner wall of the resin bushing, so that the adjusting bracket is tightly connected to the inner wall of the resin bushing. S4. When the pressure gauge value on the first compressed air pipe shows that the rated pressure value is reached, close the fixed inflation valve, and at the same time keep the disassembly inflation valve open, and set the pressure of the pressure relief regulating valve on the first compressed air pipe according to the fixed pressure value. S5. Install the bushing pressing plate on the upper end of the resin bushing. Adjust the extending length of the pressing plate strips according to the diameter of the resin bushing, so that the extending length of the pressing plate strips is less than the outer diameter of the resin bushing. Hoist the resin bushing into the freezing chamber through the hoisting cylinder. S6. Inject a freezing medium into the freezing chamber so that the resin bushing is completely immersed in the freezing medium. Cover the freezing chamber lid. After the resin bushing is frozen by the freezing medium, the resin bushing shrinks after freezing, and the inner wall of the resin bushing squeezes the adjusting bracket towards the center direction of the hoisting cylinder. S7. The adjusting bracket drives the pneumatic plunger in the pneumatic chute to squeeze the compressed air. When the gas pressure value in the second compressed air pipe reaches the discharge pressure of the pressure relief regulating valve, the discharge pressure valve automatically opens to discharge the air pressure. When the gas pressure value in the second compressed air pipe is less than the discharge pressure of the pressure relief regulating valve, the discharge pressure valve closes. S8. After the freezing is completed, open the freezing chamber lid, hoist the resin bushing through the hoisting device, and place the whole resin bushing from above the bored and machined rudder arm cast steel part into the bearing. After the resin bushing is installed in place, open the fixed inflation valve and inflate the second compressed air pipe through the disassembly inflation valve. S9. The compressed air in the second compressed air pipe enters the air cavity in the pneumatic chute between the sealing ring and the adjusting bracket through the side compressed air pipe interface, and pushes the pneumatic plunger to move towards the center of the lifting cylinder body, causing the adjusting bracket to contract, separating the adjusting bracket from the bottom of the resin bushing and entering the central through hole of the resin bushing; then the lifting device is lifted from the resin bushing to complete the freezing and installation of the resin bushing.

10. A method for cryogenic hoisting of a resin bushing for a rudder system according to claim 9, characterized in that, The height of the lifting cylinder body is greater than the height of the inner wall of the freezer.

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