Pin dismounting device for overhauling steam turbine of thermal power plant

Abstract

The utility model discloses a thermal power plant steam turbine maintenance pin dismounting device, which comprises a pin dismounting device body matched with a pin body, the pin body is sleeved with a pin sleeve, the pin dismounting device body comprises a supporting rod, the top of the supporting rod is fixedly connected with a U-shaped rod, the left side of the top of the U-shaped rod is fixedly connected with a PLC (Programmable Logic Controller), and the left side of the top of the U-shaped rod is fixedly connected with the PLC. The supporting rod is slidably sleeved with two rectangular sliding sleeves. According to the utility model, a series of structures are arranged, so that pressure-controlled anti-skid clamping can be conveniently carried out when the pin sleeve is long and the bottom is not exposed so as not to directly abut against the bottom, and the pin sleeve with the bottom not exposed is stably fixed by utilizing the anti-skid effect of the pressure-controlled clamping and the anti-skid sawteeth; and when the pin sleeve is short and the bottom of the pin sleeve is exposed and can provide a supporting space, supporting and pin dismounting work can be directly carried out, the pin dismounting mode can be flexibly selected and utilized according to the pin dismounting condition, multiple pin dismounting conditions can be flexibly coped, the applicability is improved, and after the pin sleeve is fixed, the pin body is subjected to impact dismounting work through the pin punching assembly.

Description

Technical Field

[0001] This utility model relates to the field of thermal power plant technology, specifically to a disassembly and pin removal device for the maintenance of steam turbines in thermal power plants. Background Technology

[0002] A thermal power plant, or coal-fired power plant for short, is a factory that uses combustible materials (such as coal) as fuel to produce electricity. Its basic production process is as follows: when fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then, the turbine drives the generator to rotate, converting the mechanical energy into electrical energy. The steam turbine used in conjunction with the thermal power plant is the thermal power plant turbine. When the thermal power plant turbine is used for a long time, it needs to be inspected and maintained. During the inspection and maintenance, a pin removal device is usually used. However, traditional pin removal devices are not convenient for disassembling pins of different diameters.

[0003] According to the novelty search report, announcement number CN215470866U discloses a pin removal device for steam turbine maintenance in thermal power plants. The device includes a fixed platform, a clamping mechanism, a second threaded rod, a second fixing plate, a second limiting rod, and a pin body, all located on one side of the fixed platform. The second threaded rod is threadedly connected to the central shaft at the top of the fixed platform. The structure is reasonable. The output end of a first motor drives a second gear fixed to it to rotate. The second gear drives a first gear meshing on one side to rotate. The first gear drives the second threaded rod fixed to it to rotate. The second threaded rod gradually moves downwards on the fixed platform. Simultaneously, the second threaded rod, through a bearing, drives the second fixing plate fixed to it to move up and down on the second limiting rod. As the second threaded rod gradually moves downwards, its bottom presses against the pin body. Under the pressure, the pin body is gradually disassembled, achieving a convenient operation function and demonstrating the rationality of the mechanism.

[0004] The aforementioned technology discloses a pin removal device for steam turbine maintenance in thermal power plants. This device uses two locating teeth to clamp the bottom of the pin sleeve, and a second threaded rod to move downwards and compress the pin body for removal. However, it has the following drawbacks: its method of using the clamping teeth at the bottom of the pin sleeve outside the pin body for support is only suitable for disassembly environments where the pin sleeve is fully exposed, providing space for insertion. It is also difficult to stably fix the pin sleeve when it is long or the bottom is not exposed, limiting the environments suitable for pin removal and making it difficult to flexibly handle various disassembly conditions, resulting in unsatisfactory applicability. Therefore, this application proposes a pin removal device for steam turbine maintenance in thermal power plants to solve the aforementioned problems. Utility Model Content

[0005] The purpose of this utility model is to provide a pin removal device for the maintenance of steam turbines in thermal power plants, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pin removal device for steam turbine maintenance in thermal power plants, comprising a pin removal device body that cooperates with a pin body, a pin sleeve fitted on the outside of the pin body, the pin removal device body comprising a support rod, a U-shaped rod fixedly connected to the top of the support rod, a PLC controller fixedly connected to the top left side of the U-shaped rod, and two rectangular sliding sleeves slidably fitted on the support rod;

[0007] Two rectangular holes are formed at the top of the support rod. Pressure-measuring drive components located within the corresponding rectangular holes are fixedly connected between the top and bottom inner walls of the rectangular sliding sleeve. A relative drive assembly for driving the two pressure-measuring drive components to move relative to each other is mounted on the U-shaped rod. Both pressure-measuring drive components and the relative drive assembly are electrically connected to the PLC controller. A tripod is fixedly connected to the bottom of the rectangular sliding sleeve, and an L-shaped clamping block for clamping the pin sleeve is fixedly connected to the bottom of the tripod. The two L-shaped clamping blocks are symmetrically arranged, and multiple anti-slip serrations are fixedly connected to the inner walls of the opposing sides of the two L-shaped clamping blocks. The relative drive assembly is used to synchronously drive the two pressure-measuring drive components. The two pressure-sensing drive components are used to drive the two rectangular sliding sleeves to move close together when they move close together. The two rectangular sliding sleeves are used to drive multiple anti-slip serrations to clamp the pin sleeve through two tripods and two L-shaped clamping blocks in sequence. The clamping pressure and the pressure value transmitted to the PLC controller are detected. When the preset pressure value is reached, the PLC controller can control the relative drive components to automatically close, so as to achieve stable pressure control and anti-slip clamping. In addition, for environments where the pin sleeve is short and exposed, pressure control clamping can be omitted. The two L-shaped clamping blocks can be adjusted close together and their tops can be used to support the bottom of the pin sleeve. This allows for flexible selection and use depending on the conditions of pin removal.

[0008] A punching assembly for impacting the pin body is fixedly installed on the top inner wall of the U-shaped rod; the punching assembly is used to impact and disassemble the pin body after the pin sleeve is fixed.

[0009] Preferably, the relative drive assembly includes a loop-shaped lifting rod slidably sleeved on a U-shaped rod, and an electric telescopic rod with its extended end fixedly connected to the top of the loop-shaped lifting rod is embedded and fixed on the inner wall of the top of the U-shaped rod. The electric telescopic rod is electrically connected to a PLC controller, and two inclined and symmetrically arranged connecting rods are hinged to the bottom of the loop-shaped lifting rod.

[0010] Preferably, the pressure measuring drive assembly includes an outer tube fixedly connected between the top inner wall and the bottom inner wall of the corresponding rectangular sliding sleeve. The two adjacent ends of the two outer tubes are both configured as a sealing structure. A movable seat is slidably sleeved inside the outer tube. A pressure sensor is fixedly connected between the adjacent side of the two movable seats and the adjacent inner wall of the two outer tubes, respectively. Both pressure sensors are electrically connected to the PLC controller. A tension spring in a stretched state is fixedly connected between the opposing side of the two movable seats and the opposing side inner wall of the two rectangular holes, respectively. The opposing side of the two movable seats is hinged to the bottom end of the corresponding connecting rod.

[0011] Preferably, the punching assembly includes an electric push rod fixedly connected to the inner wall of the top of the U-shaped rod, the extended end of the electric push rod extending movably through to the bottom of the support rod and fixedly connected to a punch block, and the electric push rod is located inside the U-shaped lifting rod.

[0012] Preferably, a storage battery is fixedly connected to the top inner wall of the U-shaped rod, and the PLC controller, electric telescopic rod, and electric push rod are all electrically connected to the storage battery.

[0013] Preferably, a U-shaped handle is fixedly connected to the top of the U-shaped rod.

[0014] Preferably, the punch block is located between the two tripods and above the pin body.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By using a set PLC controller, U-shaped rod, support rod, relative drive assembly, pressure testing drive assembly, rectangular sliding sleeve, tripod, L-shaped clamping block and anti-slip serrations, pressure control and anti-slip clamping can be performed when the pin sleeve is long and the bottom is not exposed, making it impossible to directly support the bottom. The pressure control clamping combined with the anti-slip effect of the anti-slip serrations can achieve stable fixation of the pin sleeve with the bottom not exposed.

[0017] It can directly carry out the dismantling and removal of the pin when the pin sleeve is short and the bottom is exposed to provide space for dismantling and removal. It is convenient to flexibly select the dismantling and removal method according to the dismantling and removal conditions, and it is easy to flexibly deal with various dismantling and removal conditions, thus improving applicability.

[0018] By driving the two L-shaped clamping blocks to move in opposite or similar directions, the clamping or abutment spacing can be adjusted, making it convenient to fix and remove pins of different diameters.

[0019] 2. By using the set impact pin component, the pin body can be disassembled by impact after the pin sleeve is fixed.

[0020] This utility model incorporates a series of structures to facilitate controlled pressure and anti-slip clamping when the pin sleeve is long and the bottom is not exposed, preventing direct bottom support. The controlled pressure clamping, combined with the anti-slip effect of the anti-slip serrations, achieves stable fixation of the pin sleeve with an unexposed bottom. Furthermore, it allows for direct pin removal when the pin sleeve is short and the bottom is exposed, providing support space. This allows for flexible selection of pin removal methods based on the conditions, facilitating adaptability to various situations and improving applicability. After the pin sleeve is fixed, a punching component is used to impact and dismantle the pin body. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a pin removal device for steam turbine maintenance in a thermal power plant, as proposed in this utility model.

[0022] Figure 2 for Figure 1 A bottom view of the main body of the dismantling pin device in the diagram;

[0023] Figure 3 This is a schematic diagram of the main sectional view of a pin removal device for steam turbine maintenance in a thermal power plant, as proposed in this utility model.

[0024] Figure 4 for Figure 3 A magnified structural diagram of part A in the diagram;

[0025] Figure 5 This is a schematic diagram of the bottom support state of a short, fully exposed pin sleeve for the maintenance of a steam turbine in a thermal power plant, as proposed in this utility model.

[0026] In the diagram: 100, Pin body; 1, Support rod; 101, Rectangular hole; 2, Rectangular sliding sleeve; 3, Triangular frame; 301, L-shaped clamping block; 302, Anti-slip serrations; 4, U-shaped rod; 401, PLC controller; 5, Recurve lifting rod; 501, Electric telescopic rod; 502, Connecting rod; 503, Moving seat; 504, Outer tube; 505, Pressure sensor; 506, Tension spring; 6, Electric push rod; 601, Punch block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1 to 5As shown in the figure, the pin removal device for steam turbine maintenance in thermal power plants proposed in this embodiment includes a pin removal device body that cooperates with the pin body 100. The pin body 100 is fitted with a pin sleeve on the outside. The pin removal device body includes a support rod 1. A U-shaped rod 4 is fixedly connected to the top of the support rod 1. A PLC controller 401 is fixedly connected to the top left of the U-shaped rod 4. Two rectangular sliding sleeves 2 are slidably sleeved on the support rod 1. A U-shaped handle is fixedly connected to the top of the U-shaped rod 4.

[0029] The top of the support rod 1 has two rectangular holes 101. Pressure-measuring drive components located within the corresponding rectangular holes 101 are fixedly connected between the top and bottom inner walls of the rectangular sliding sleeve 2. A relative drive assembly for driving the two pressure-measuring drive components to move relative to each other is installed on the U-shaped rod 4. Both pressure-measuring drive components and the relative drive assembly are electrically connected to the PLC controller 401. A tripod 3 is fixedly connected to the bottom of the rectangular sliding sleeve 2. An L-shaped clamping block 301 for clamping the pin sleeve is fixedly connected to the bottom of the tripod 3. The two L-shaped clamping blocks 301 are symmetrically arranged, and multiple anti-slip serrations 302 are fixedly connected to the inner walls of the opposing sides of the two L-shaped clamping blocks 301. The relative drive assembly is used to synchronously drive the two pressure-measuring drive components. The drive components move in close proximity or repulsively. Two pressure-measuring drive components are used to drive two rectangular sliding sleeves 2 to move in close proximity when they move in close proximity. The two rectangular sliding sleeves 2 are used to drive multiple anti-slip serrations 302 to clamp the pin sleeve through two triangular frames 3 and two L-shaped clamping blocks 301 in sequence. The clamping pressure is detected and the pressure value transmitted to the PLC controller 401 is detected. When the preset pressure value is reached, the PLC controller 401 controls the relative drive components to automatically close, so as to achieve stable pressure control and anti-slip clamping work. In addition, for environments where the pin sleeve is short and exposed as a whole, pressure control clamping can be omitted. The two L-shaped clamping blocks 301 can be adjusted in close proximity and their tops can be used to support the bottom of the pin sleeve. This allows for flexible selection and use depending on the conditions for removing the pin.

[0030] A punching assembly for impacting the pin body 100 is fixedly installed on the top inner wall of the U-shaped rod 4; the punching assembly is used to impact and disassemble the pin body 100 after the pin sleeve is fixed.

[0031] Specifically, the relative drive assembly includes a loop-shaped lifting rod 5 slidably sleeved on a U-shaped rod 4. The top of the loop-shaped lifting rod 5 has two rectangular guide holes that slide in contact with the outer side of the U-shaped rod 4, which serve to guide the vertical sliding of the loop-shaped lifting rod 5. An electric telescopic rod 501 with its extended end fixedly connected to the top of the loop-shaped lifting rod 5 is embedded and fixed on the inner wall of the top of the U-shaped rod 4. The electric telescopic rod 501 is electrically connected to the PLC controller 401. The bottom of the loop-shaped lifting rod 5 is hinged to two inclined and symmetrically arranged connecting rods 502. The loop-shaped lifting rod 5, the electric telescopic rod 501 and the connecting rods 502 cooperate to drive the loop-shaped lifting rod 5 to move up and down using the electric telescopic rod 501. The loop-shaped lifting rod 5 drives the two connecting rods 502 to rotate up and down. When the two connecting rods 502 rotate down, they perform a close compression drive operation. When the two connecting rods 502 rotate up, they perform a pull-back operation.

[0032] Furthermore, the pressure-sensing drive assembly includes an outer tube 504 fixedly connected between the top and bottom inner walls of the corresponding rectangular sliding sleeve 2. The ends of the two outer tubes 504 that are close together are both sealed. A movable seat 503 is slidably fitted inside the outer tube 504. Pressure sensors 505 are fixedly connected between the close sides of the two movable seats 503 and the inner walls of the close ends of the two outer tubes 504, respectively. Both pressure sensors 505 are electrically connected to the PLC controller 401. Tension springs 506 in a stretched state are fixedly connected between the opposing sides of the two movable seats 503 and the opposing sides of the two rectangular holes 101, respectively. The opposing sides of the two movable seats 503 are hinged to the bottom ends of the corresponding connecting rods 502. The outer tube 504, movable seat 503, and pressure sensors 505 are also included. In conjunction with the tension spring 506, the two connecting rods 502 rotate downwards, squeezing and driving the two moving seats 503 to move close together, and stretching the two tension springs 506. The two moving seats 503 sequentially drive the two outer tubes 504 to move close together through the two pressure sensors 505. The two outer tubes 504 sequentially drive the two rectangular sliding sleeves 2, two triangular brackets 3, and two L-shaped clamping blocks 301 to clamp the pin sleeve with multiple anti-slip serrations 302. The two pressure sensors 505 detect the similar squeezing force applied by the two moving seats 503 and transmit the pressure value to the PLC controller 401. When the preset pressure value is reached, the PLC controller 401 controls the electric telescopic rod 501 to automatically close, achieving a stable pressure control and anti-slip clamping effect when the pin sleeve is long and the bottom is not exposed, making it impossible to directly support the bottom.

[0033] Furthermore, the punching assembly includes an electric push rod 6 fixedly connected to the inner wall of the top of the U-shaped rod 4. The extended end of the electric push rod 6 extends movably through to the bottom of the support rod 1 and is fixedly connected to a punch block 601. The top of the support rod 1 has a movable through hole for the extended end of the electric push rod 6 to pass through. The electric push rod 6 is located inside the U-shaped lifting rod 5. A storage battery is fixedly connected to the inner wall of the top of the U-shaped rod 4. The PLC controller 401, the electric telescopic rod 501, and the electric push rod 6 are all electrically connected to the storage battery. The punch block 601 is located between the two tripods 3 and above the pin body 100. The electric push rod 6 and the punch block 601 cooperate. After the pin sleeve is fixed, the operator operates the electric push rod 6 to drive the punch block 601 to move up and down, so that it impacts the pin body 100 multiple times to separate the pin body 100 from the pin sleeve, thereby realizing the impact disassembly of the pin body 100.

[0034] The usage method of this embodiment is as follows: When using the pin removal device for steam turbine maintenance in thermal power plants, in the process of removing pins during steam turbine maintenance in thermal power plants, when facing an environment where the pin sleeve is long or the bottom is not exposed and cannot provide bottom support, the personnel pre-set the closing pressure value of the electric telescopic rod 501 according to the pin sleeve clamping requirements using the PLC controller 401. Then, the electric telescopic rod 501 is started in the forward direction, causing it to drive the loop lifting rod 5 to slide downward on the U-shaped rod 4. The loop lifting rod 5 drives the two connecting rods 502 to rotate downward. When the two connecting rods 502 rotate downward, they squeeze and drive the two moving seats 503 to move close together, and stretch the two tension springs 506. The two moving seats 503 sequentially drive the two outer tubes 504 to move close together through the two pressure sensors 505. The two outer tubes 504 drive the two rectangular sliding sleeves 2 to slide close together on the support rod 1. The sliding sleeve 2 is driven by two triangular frames 3 and two L-shaped clamping blocks 301 to clamp multiple anti-slip serrations 302 towards the center to secure the pin sleeve. Two pressure sensors 505 detect the similar compressive force applied by the two moving seats 503 and transmit the pressure value to the PLC controller 401. When the preset pressure value is reached, the PLC controller 401 controls the electric telescopic rod 501 to automatically close, so as to achieve the effect of pressure control and anti-slip clamping when the pin sleeve is long and the bottom is not exposed, so that it cannot be directly supported at the bottom. The pressure control clamping combined with the anti-slip effect of the anti-slip serrations 302 achieves stable fixation of the pin sleeve with the bottom not exposed. Then, the personnel operate the electric push rod 6 to drive the punch block 601 to move up and down, so that it impacts the pin body 100 multiple times to achieve the separation of the pin body 100 from the pin sleeve, and realize the impact disassembly of the pin body 100.

[0035] For shorter pin sleeves with exposed bottoms that provide support space, pressure clamping is not required. Instead, two L-shaped clamping blocks 301 can be adjusted to be close together, and the tops of the two L-shaped clamping blocks 301 can be used to directly support the bottom of the pin sleeve. Then, the electric push rod 6 drives the punch block 601 to move up and down to impact and disassemble the pin body 100. This allows for flexible selection of the disassembly method depending on the disassembly conditions, making it easier to cope with various disassembly conditions and improving applicability.

[0036] After the pin is removed, the electric telescopic rod 501 is activated in reverse to drive the loop lifting rod 5 to move upward. The loop lifting rod 5 drives the two connecting rods 502 to rotate upward. The two connecting rods 502 pull against the two moving seats 503. At this time, the two tension springs 506 in the tension state assist in driving the two moving seats 503 to move back against each other. The two moving seats 503 drive multiple anti-slip serrations 302 to separate outward from the pin sleeve through the two pressure sensors 505, two rectangular sliding sleeves 2, two triangular brackets 3 and two L-shaped clamping blocks 301 in sequence. The pin can then be removed again. The two L-shaped clamping blocks 301 can move against each other or close to each other, which can adjust the spacing and facilitate the fixing and removal of pin sleeves of different diameters.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pin removal device for overhauling steam turbines in thermal power plants, comprising a pin removal device body that cooperates with a pin body (100), wherein a pin sleeve is fitted on the outer side of the pin body (100), characterized in that: The main body of the disassembly device includes a support rod (1), a U-shaped rod (4) is fixedly connected to the top of the support rod (1), a PLC controller (401) is fixedly connected to the top left side of the U-shaped rod (4), and two rectangular sliding sleeves (2) are slidably sleeved on the support rod (1). The top of the support rod (1) has two rectangular holes (101). The top inner wall and bottom inner wall of the rectangular sleeve (2) are fixedly connected to a pressure measuring drive assembly located in the corresponding rectangular hole (101). A relative drive assembly for driving the two pressure measuring drive assemblies to move relative to each other is installed on the U-shaped rod (4). Both pressure measuring drive assemblies and relative drive assembly are electrically connected to the PLC controller (401). A tripod (3) is fixedly connected to the bottom of the rectangular sleeve (2). An L-shaped clamping block (301) for clamping the pin sleeve is fixedly connected to the bottom of the tripod (3). The two L-shaped clamping blocks (301) are symmetrically arranged. Multiple anti-slip serrations (302) are fixedly connected to the inner wall of the opposing side of the two L-shaped clamping blocks (301). A punching assembly for impacting the pin body (100) is fixedly installed on the top inner wall of the U-shaped rod (4).

2. The pin-removal device for overhauling steam turbines in thermal power plants according to claim 1, characterized in that: The relative drive assembly includes a loop-shaped lifting rod (5) that is slidably sleeved on a U-shaped rod (4). An electric telescopic rod (501) with its extended end fixedly connected to the top of the loop-shaped lifting rod (5) is embedded and fixed on the inner top wall of the U-shaped rod (4). The electric telescopic rod (501) is electrically connected to a PLC controller (401). Two inclined and symmetrically arranged connecting rods (502) are hinged to the bottom of the loop-shaped lifting rod (5).

3. The pin-removal device for overhauling steam turbines in thermal power plants according to claim 2, characterized in that: The pressure measurement drive assembly includes an outer tube (504) fixedly connected between the top inner wall and the bottom inner wall of the corresponding rectangular sliding sleeve (2). The two outer tubes (504) are both configured with a sealing structure at their close ends. A movable seat (503) is slidably sleeved inside the outer tube (504). A pressure sensor (505) is fixedly connected between the close side of the two movable seats (503) and the close inner wall of the two outer tubes (504). The two pressure sensors (505) are electrically connected to the PLC controller (401). A tension spring (506) in a stretched state is fixedly connected between the opposing side of the two movable seats (503) and the opposing side inner wall of the two rectangular holes (101). The opposing side of the two movable seats (503) is hinged to the bottom end of the corresponding connecting rod (502).

4. A pin-removal device for overhauling steam turbines in thermal power plants according to claim 2, characterized in that: The punching assembly includes an electric push rod (6) fixedly connected to the inner wall of the top of the U-shaped rod (4). The extended end of the electric push rod (6) extends movably through to the bottom of the support rod (1) and is fixedly connected to a punch block (601). The electric push rod (6) is located inside the spiral lifting rod (5).

5. A pin-removal device for overhauling steam turbines in thermal power plants according to claim 4, characterized in that: A storage battery is fixedly connected to the top inner wall of the U-shaped rod (4), and the PLC controller (401), electric telescopic rod (501) and electric push rod (6) are all electrically connected to the storage battery.

6. A pin-removal device for overhauling steam turbines in thermal power plants according to claim 1, characterized in that: A U-shaped handle is fixedly connected to the top of the U-shaped rod (4).

7. A pin-removal device for overhauling steam turbines in thermal power plants according to claim 4, characterized in that: The punch block (601) is located between the two tripods (3) and above the pin body (100).

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