Automatic rotating and disassembling device for large multi-cylinder compressor and its use method

Abstract

A large multi-cylinder compressor automatic rotation and disassembly device and its use method, the automatic rotation and disassembly device includes a hydraulic cylinder fixedly mounted on the high-pressure cylinder support leg, a rotating platform composed of a rotating platform seat and a slewing support device mounted in the rotating platform seat, a rotating platform mobile support device composed of a telescopic rod mounted on the rotating platform base and a roller at the lower end of the telescopic rod, and a control system. When using this device to disassemble and repair the high-pressure cylinder, it is only necessary to place the high-pressure cylinder compressor inner casing disassembly platform in a position where it can dock with the high-pressure cylinder after rotating it a certain angle. The high-pressure cylinder is rotated on the spot by a certain angle using this device and docked with the compressor inner casing disassembly platform for maintenance. This avoids interference with the intermediate-pressure cylinder located at the rear of the high-pressure cylinder, and there is no need to move the intermediate-pressure cylinder and the high-pressure cylinder compressor inner casing disassembly platform, making maintenance more convenient. Compared with using a large crane for lifting and repair, the process is simpler and the maintenance cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an automatic rotating and disassembling device for a large multi-cylinder compressor and a use method thereof. Background Art

[0002] A large compressor unit consists of a steam turbine and high-, intermediate-, and low-pressure cylinders. The low-pressure cylinder is placed alone on one side of the turbine, while the intermediate- and high-pressure cylinders are placed on the other side of the turbine. The high-pressure cylinder is adjacent to the turbine, followed by the intermediate-pressure cylinder. When repairing the compressor, since the high-pressure cylinder is located between the intermediate-pressure cylinder and the turbine, if you want to disassemble and install the high-pressure cylinder rotor, you must first move the intermediate-pressure cylinder out of the way. Then, install a dedicated high-pressure cylinder inner casing disassembly and assembly platform in the original intermediate-pressure cylinder position. Only then can the rotor located in the high-pressure cylinder casing be pulled out for repair. After the repair is completed, the dedicated high-pressure cylinder inner casing disassembly and assembly platform is moved out of the way, and the intermediate-pressure cylinder is returned to its original position. Because the intermediate-pressure cylinder weighs over a hundred tons, moving it requires a large crane, which is expensive and companies typically only use for equipment overhauls. Large compressor units are only repaired every few years, so crane utilization is very low. Installing a large crane places high demands on the load-bearing capacity of the factory walls. Disassembling the rotors of large compressors requires large, specialized tooling. After removing the intermediate-pressure cylinder, the high-pressure cylinder-specific compressor inner casing disassembly and assembly platform must be installed at the rear of the high-pressure cylinder to connect it to the high-pressure cylinder. This operation is time-consuming, labor-intensive, inconvenient, and expensive. Therefore, reducing the difficulty and cost of repairing large multi-cylinder compressors has become a pressing issue that needs to be addressed. Summary of the Invention

[0003] In response to this urgent problem, the present invention provides an automatic rotating and disassembling device for a large multi-cylinder compressor, which can lift the high-pressure cylinder on site and rotate it to a certain angle for maintenance, and a method for using the device.

[0004] The automatic rotating and disassembling device for a large multi-cylinder compressor provided by the present invention comprises four hydraulic cylinders respectively fixedly mounted on four legs of a high-pressure cylinder, a rotating platform, a mobile support device and a control system;

[0005] The rotating platform includes a rotating platform seat and a slewing support device; the slewing support device includes a drive mechanism installed inside the rotating platform seat and composed of a motor acceleration and reduction gear (or a hydraulic motor) and a support plate driven by the drive mechanism through a transmission mechanism; the transmission mechanism includes a bearing composed of an outer ring, an inner ring, a rolling element and a cage assembly, the outer ring of the bearing is fixedly installed on the upper part of the rotating platform seat, the inner ring of the bearing is fixedly connected to the support plate, and the inner hole wall of the inner ring of the bearing is provided with a transmission tooth, which meshes with the pinion on the output shaft of the reducer; the upper surface of the support plate has a key that can cooperate with the keyway on the bottom surface of the high-pressure cylinder;

[0006] The mobile support device includes a set of two telescopic rods, which are respectively installed at the front and rear of the rotating platform seat. The telescopic rods are placed at the lower part of the stepped hole of the rotating platform seat and can be extended and retracted up and down by the spring installed at the upper part of the stepped hole. The lower end of the telescopic rod is equipped with a bearing roller exposed at the bottom surface of the rotating platform seat.

[0007] The control system includes a manual control device and an automatic control device (including remote control), which are used to manually or automatically control the operation of the motors in the hydraulic cylinder and the rotating platform.

[0008] The method for using the automatic rotating and disassembling device for the large multi-cylinder compressor comprises the following steps:

[0009] Step 1: Configure a separate compressor inner casing disassembly and assembly platform for the high-pressure cylinder and place it in a position where it can be rotated 90 degrees and docked with the high-pressure cylinder;

[0010] Step 2: Remove the fixing bolts between the high-pressure cylinder legs and the high-pressure cylinder base, start the hydraulic control system through the control system, extend the piston rod of the hydraulic cylinder downward, and press the piston rod head against the high-pressure cylinder base, raising the high-pressure cylinder to a certain height to facilitate the installation of the rotating platform;

[0011] Step 3: Push the rotating platform to the bottom of the high-pressure cylinder. During the movement of the rotating platform, the bearing roller extends out of the bottom surface of the rotating platform seat under the action of the spring force of the mobile support device, supporting the rotating platform so that a certain gap is maintained between the bottom surface of the rotating platform seat and the high-pressure cylinder base. The rotating platform moves by rolling on the high-pressure cylinder base with the bearing roller;

[0012] Step 4: Start the driving mechanism of the rotating platform through the control system to rotate the support plate, adjust the rotation angle of the support plate, and align the key on the top of the support plate with the keyway at the bottom of the high-pressure cylinder;

[0013] Step 5: retract the piston rod of the hydraulic cylinder, and the high-pressure cylinder falls on the support plate on the top of the rotating platform. Under the action of the gravity of the high-pressure cylinder, the spring in the rotating platform moving support device is compressed, and the telescopic rod retracts, driving the bearing roller to retract to the bottom surface of the rotating platform seat, and the rotating platform is seated on the high-pressure cylinder base (1);

[0014] Step 6. Start the driving mechanism in the rotating platform. The driving mechanism drives the support plate and the high-pressure cylinder on the top of the support plate to rotate together through the transmission mechanism. Stop the driving mechanism when the high-pressure cylinder rotates to dock with the compressor inner casing disassembly and assembly platform. Then extend the piston rod of the hydraulic cylinder downward to support the high-pressure cylinder (the high-pressure cylinder does not leave the support plate at this time). The high-pressure cylinder is supported by the hydraulic cylinder and the rotating platform to ensure the stability of the high-pressure cylinder. Pull out the rotor in the high-pressure cylinder casing and start the subsequent maintenance of the high-pressure cylinder.

[0015] Step 7. After the high-pressure cylinder maintenance is completed, retract the piston rod of the hydraulic cylinder and leave the high-pressure cylinder base. Use the same method to rotate the high-pressure cylinder back to the normal working position. Extend the piston rod of the hydraulic cylinder downward to support the high-pressure cylinder. The spring in the rotating platform moving support device pushes out the bearing roller through the telescopic rod, and moves the rotating platform out from the bottom of the high-pressure cylinder. Then retract the piston rod of the hydraulic cylinder and lower the high-pressure cylinder to the high-pressure cylinder base to complete the disassembly and maintenance of the high-pressure cylinder.

[0016] Beneficial effects of the present invention:

[0017] 1. When the high-pressure cylinder is disassembled and repaired by using the present invention, it is only necessary to place the high-pressure cylinder compressor inner casing disassembly and assembly platform at a position where the high-pressure cylinder can be docked with the high-pressure cylinder after the high-pressure cylinder is rotated by a certain angle, and then use the device of the present invention to rotate the high-pressure cylinder on the spot so that it can be docked with the compressor inner casing disassembly and assembly platform. This can avoid interference between the high-pressure cylinder and the intermediate-pressure cylinder located behind it, and there is no need to move the intermediate-pressure cylinder or the high-pressure cylinder compressor inner casing disassembly and assembly platform, making maintenance more convenient.

[0018] 2. A hydraulic cylinder is arranged on the support leg of the high-pressure cylinder, which allows the hydraulic cylinder to rotate together with the high-pressure cylinder. Once the rotating platform fails during the rotation process, the hydraulic cylinder can prop up the high-pressure cylinder at any time to facilitate the maintenance of the rotating platform. The phenomenon that the rotating platform and the high-pressure cylinder cannot be separated during the rotation of the rotating platform, resulting in the high-pressure cylinder being unable to return to its original position, will not occur, making the operation of the entire device more flexible and reliable.

[0019] 3. The rotating platform of the present invention can be moved freely. It can be transported to the site during overhaul and returned to the warehouse after maintenance. It does not take up much space and will not interfere with other parts of the compressor.

[0020] 4. When using the present invention to overhaul a large multi-cylinder compressor, there is no need to reinforce the factory building. Compared with using a large crane, the operation is simple and flexible, and the maintenance cost is greatly reduced.

[0021] 5. It adopts a combination of manual control device and automatic control device, which can be manually controlled at the on-site operating table and remotely controlled. The operation is more flexible and the labor intensity of workers is greatly reduced.

[0022] 6. The rotating platform is equipped with a mobile support device. The rotating platform moves by rolling on the high-pressure cylinder base with the bearing roller in the mobile support device, thereby reducing the friction resistance between the rotating platform and the high-pressure cylinder base and alleviating the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure and use of the present invention (a schematic diagram of the high-pressure cylinder after being rotated 90 degrees and docked with the compressor inner casing disassembly and assembly platform);

[0024] Figure 2 This is a top view of the device of the present invention when the high-pressure cylinder is in working condition (the rotating platform is placed below the high-pressure cylinder);

[0025] Figure 3 A bottom view of the rotating platform of the present invention;

[0026] Figure 4 is a cross-sectional view of the rotating platform of the present invention;

[0027] Figure 5 A top view of the support plate of the present invention;

[0028] Figure 6 is a cross-sectional view of the mobile support device of the present invention;

[0029] Figure 7 It is a schematic diagram of the connection between the hydraulic cylinder and the high-pressure cylinder support leg in the present invention.

[0030] Explanation of symbols in the figure: 1. High-pressure cylinder base, 2. Hydraulic cylinder, 21. Bolt (for fixing the hydraulic cylinder), 3. Rotating platform, 31. Reducer, 310. Pinion (on the output shaft of the reducer), 32. Motor, 33. Support plate, 331. Key, 34. Outer ring (of the bearing), 35. Rotating platform seat, 36. Inner ring (of the bearing), 361. Transmission tooth (on the inner hole wall of the inner ring of the bearing), 362. Rolling element and retaining rack assembly, 37. Screw, 38. Spring, 39. Nut, 311. Spring seat, 312. Bearing roller, 313. Telescopic rod, 314. Push rod, 315. Stepped hole, 4. High-pressure cylinder, 41. Support leg (of the high-pressure cylinder), 5. Rotating platform pad, 6. Compressor inner casing disassembly and assembly platform, 7. Rotor, 8. Control system. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and examples.

[0032] Combine Figure 1 and Figure 7 The embodiment of the automatic rotating and disassembling device for a large multi-cylinder compressor of the present invention comprises four hydraulic cylinders 2 (with the piston rods of the hydraulic cylinders facing downwards) respectively fixedly mounted on four legs (41) of a high-pressure cylinder 4 by bolts 21, a rotating platform 3, a movable support device and a control system 8.

[0033] The rotating platform 3 is as follows Figure 3 and Figure 4As shown, it includes a rotating platform seat 35 and a rotary support device; the rotary support device includes a driving mechanism installed inside the rotating platform seat, composed of a motor 32 and a reducer 31, and a support plate 33 driven by the driving mechanism through a transmission mechanism; the transmission mechanism includes a bearing composed of an outer ring 34, an inner ring 36 and a rolling element and a retaining frame assembly 362. The outer ring 34 of the bearing is fixedly installed on the upper part of the rotating platform seat, and the inner ring of the bearing is fixedly connected to the support plate. There is a transmission tooth 361 on the inner hole wall of the inner ring 36 of the bearing, which is engaged with the pinion 310 on the output shaft of the reducer. The rotation of the pinion drives the inner ring of the bearing and the support plate to rotate together through the transmission teeth on the inner hole wall of the inner ring of the bearing; the upper surface of the support plate has a key 331 (as shown in FIG. 1 ) which can cooperate with the key groove on the bottom surface of the high-pressure cylinder. Figure 2 and Figure 5 shown).

[0034] The mobile support device is as follows Figure 6 As shown, it includes two telescopic rods 313 in a group, which are respectively installed at the front and rear of the rotating platform seat. The telescopic rods are placed at the lower part of the stepped hole 315 of the rotating platform seat. The upper part of the stepped hole is provided with a nut 39 that cooperates with the internal thread of the stepped hole. The top of the telescopic rod is fixed to the spring seat 311 with a screw 37, and a spring 38 is installed between the nut and the spring seat. The lower end of the telescopic rod is installed with a bearing roller 312 through a pin shaft. The bearing roller is exposed from the bottom surface of the rotating platform seat under the action of the spring. When the rotating platform moves on the high-pressure cylinder base 1, the rotating platform maintains a certain gap with the high-pressure cylinder base under the support of the bearing roller. The rotating platform moves on the high-pressure cylinder base by rolling the bearing roller on the high-pressure cylinder base, so as to reduce the friction resistance between the rotating platform and the high-pressure cylinder base when moving, thereby reducing the labor intensity of workers. By adjusting the upper and lower positions of the nut in the stepped hole, the compression of the spring is changed, and then the spring elastic force is adjusted to maintain an appropriate gap between the rotating platform seat and the high-pressure cylinder base.

[0035] The control system includes an automatic control device (including remote control) and a manual control device (both not shown in the figure), which are used to automatically or manually control the operation of the hydraulic cylinder 2 and the motor 32 in the rotating platform.

[0036] The method for using the automatic rotating and disassembling device for a large multi-cylinder compressor comprises the following steps:

[0037] Step 1: configure a separate compressor inner casing disassembly platform 6 for the high-pressure cylinder and place it in a position where it can be docked with the high-pressure cylinder after rotating 90 degrees (such as Figure 1 and Figure 2 shown).

[0038] Step 2: Remove the fixing bolts between the high-pressure cylinder legs and the high-pressure cylinder base (not shown), start the hydraulic control system through the control system, extend the piston rod of the hydraulic cylinder downward, and press the head of the piston rod against the high-pressure cylinder base, lifting the high-pressure cylinder to a certain height to facilitate the installation of the rotating platform.

[0039] Step 3. Push the rotating platform to the lower part of the high-pressure cylinder through the rotating platform pad 5 that is flush with the upper surface of the high-pressure cylinder base (if the high-pressure cylinder base is large enough, the rotating platform can be placed directly on the base without a rotating platform pad). During the movement of the rotating platform, under the elastic force of the spring in the mobile support device, the bearing roller extends out of the bottom surface of the rotating platform seat to support the rotating platform, so that a certain gap is maintained between the bottom surface of the rotating platform seat and the high-pressure cylinder base. The rotating platform moves by rolling on the high-pressure cylinder base with the bearing roller to reduce the friction resistance between the rotating platform and the high-pressure cylinder base, thereby reducing the labor intensity of the workers.

[0040] Step 4: Start the driving mechanism of the rotating platform through the control system to rotate the support plate, adjust the rotation angle of the support plate, and make the key on the top of the support plate dock with the keyway at the bottom of the high-pressure cylinder.

[0041] Step 5: Retract the piston rod of the hydraulic cylinder, and the high-pressure cylinder falls on the support plate on the top of the rotating platform. Under the action of the gravity of the high-pressure cylinder, the spring in the rotating platform seat is compressed, and the telescopic rod retracts, driving the bearing roller to retract to the bottom surface of the rotating platform seat, and the rotating platform sits on the base of the high-pressure cylinder.

[0042] Step 6. Start the driving mechanism in the rotating platform. The driving mechanism drives the support plate and the high-pressure cylinder on the top of the support plate to rotate together through the transmission mechanism. When the high-pressure cylinder rotates to dock with the compressor inner casing disassembly and assembly platform, the driving mechanism stops running. Then, the piston rod of the hydraulic cylinder is extended downward to support the high-pressure cylinder (the high-pressure cylinder does not leave the support plate at this time). The high-pressure cylinder is supported by the hydraulic cylinder and the rotating platform to ensure the stability of the high-pressure cylinder. Then, the rotor located in the high-pressure cylinder casing is pulled out, and the subsequent maintenance of the high-pressure cylinder begins.

[0043] Step 7. After the high-pressure cylinder maintenance is completed, retract the piston rod of the hydraulic cylinder and leave it about 10CM away from the high-pressure cylinder base. Use the same method to rotate the high-pressure cylinder back to the normal working position. Extend the piston rod of the hydraulic cylinder downward to support the high-pressure cylinder. The spring in the rotating platform moving support device will push out the bearing roller, move the rotating platform out from the bottom of the high-pressure cylinder, then retract the piston rod of the hydraulic cylinder and lower the high-pressure cylinder to the high-pressure cylinder base to complete the disassembly and maintenance of the high-pressure cylinder.

Claims

1. An automatic rotating and disassembling device for a large multi-cylinder compressor, characterized by: It comprises four hydraulic cylinders (2) respectively fixedly mounted on four legs (41) of the high-pressure cylinder, a rotating platform (3), a mobile support device and a control system (8); The rotating platform (3) includes a rotating platform seat (35) and a rotary support device; the rotary support device includes a driving mechanism installed inside the rotating platform seat and composed of a motor (32) and a reducer (31), and a support plate (33) driven by the driving mechanism through a transmission mechanism; the transmission mechanism includes a bearing composed of an outer ring (34), an inner ring (36), and a rolling element and a retaining frame assembly (362); the outer ring (34) of the bearing is fixedly installed on the upper part of the rotating platform seat, the inner ring of the bearing is fixedly connected to the support plate, and a transmission tooth (361) is provided on the inner hole wall of the inner ring (36) of the bearing, and the transmission tooth is engaged with a small gear (310) on the output shaft of the reducer; the upper surface of the support plate has a key (331) that can match the key groove on the bottom surface of the high-pressure cylinder; The mobile support device includes two telescopic rods (313) in a group, which are respectively installed at the front and rear of the rotating platform seat. The telescopic rods are placed at the lower part of the stepped hole (315) of the rotating platform seat and can be extended and retracted up and down by a spring (38) installed at the upper part of the stepped hole. The lower end of the telescopic rod is installed with a bearing roller (312) exposed from the bottom surface of the rotating platform seat. The control system includes a manual control device and an automatic control device, which are used to manually or automatically control the operation of the hydraulic cylinder and the motor in the rotating platform.

2. A method for using the automatic rotating and disassembling device for a large multi-cylinder compressor according to claim 1, Its characteristics include the following steps: Step 1: A compressor inner casing disassembly platform (6) is separately configured for the high-pressure cylinder, and is placed in a position where it can be docked with the high-pressure cylinder after being rotated 90 degrees; Step 2: Remove the fixing bolts between the high-pressure cylinder legs and the high-pressure cylinder base, start the hydraulic control system through the control system, extend the piston rod of the hydraulic cylinder downward, and press the piston rod head against the high-pressure cylinder base, raising the high-pressure cylinder to a certain height to facilitate the installation of the rotating platform; Step 3: Push the rotating platform to the bottom of the high-pressure cylinder. During the movement of the rotating platform, the bearing roller extends out of the bottom surface of the rotating platform seat under the action of the spring force of the mobile support device, supporting the rotating platform so that a certain gap is maintained between the bottom surface of the rotating platform seat and the high-pressure cylinder base. The rotating platform moves by rolling on the high-pressure cylinder base with the bearing roller; Step 4: Start the driving mechanism of the rotating platform through the control system to rotate the support plate, adjust the rotation angle of the support plate, and align the key on the top of the support plate with the keyway at the bottom of the high-pressure cylinder; Step 5: retract the piston rod of the hydraulic cylinder, and the high-pressure cylinder falls on the support plate on the top of the rotating platform. Under the action of the gravity of the high-pressure cylinder, the spring in the rotating platform moving support device is compressed, and the telescopic rod retracts, driving the bearing roller to retract to the bottom surface of the rotating platform seat, and the rotating platform is seated on the high-pressure cylinder base (1); Step 6: Start the driving mechanism in the rotating platform. The driving mechanism drives the support plate and the high-pressure cylinder on the top of the support plate to rotate together through the transmission mechanism. When the high-pressure cylinder rotates to dock with the compressor inner casing disassembly and assembly platform, the driving mechanism stops running. Then, the piston rod of the hydraulic cylinder is extended downward to support the high-pressure cylinder. At this time, the high-pressure cylinder is supported by the hydraulic cylinder and the rotating platform to ensure the stability of the high-pressure cylinder. Then, the rotor located in the high-pressure cylinder casing is pulled out, and the subsequent maintenance of the high-pressure cylinder begins. Step 7. After the high-pressure cylinder maintenance is completed, retract the piston rod of the hydraulic cylinder and leave the high-pressure cylinder base. Use the same method to rotate the high-pressure cylinder back to the normal working position. Extend the piston rod of the hydraulic cylinder downward to support the high-pressure cylinder. The spring in the rotating platform moving support device pushes out the bearing roller through the telescopic rod, and moves the rotating platform out from the bottom of the high-pressure cylinder. Then retract the piston rod of the hydraulic cylinder and lower the high-pressure cylinder to the high-pressure cylinder base to complete the disassembly and maintenance of the high-pressure cylinder.

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