A full-automatic jigger for coal gas blower and its using method

Abstract

The application discloses a kind of full-automatic turning gear for coal gas blower and its using method, including PLC control mechanism, power mechanism and turning gear mechanism;PLC control mechanism is PLC control cabinet;Power mechanism includes explosion-proof frequency conversion motor and the speed reducer connected with explosion-proof frequency conversion motor;Explosion-proof frequency conversion motor is connected with PLC control cabinet;Turning gear mechanism includes clutch, pawl transmission mechanism, speed sensor and limit sensor;Clutch is connected with speed reducer;Pawl transmission mechanism is arranged in clutch, to drive the rotation of clutch;Speed sensor is arranged on the side of clutch, and is connected with PLC control cabinet, to detect the rotating speed of clutch;Limit sensor is arranged on the side of clutch, and is connected with PLC control cabinet, to detect the cut-in / off of clutch.The application is suitable for various turning speed, full-automatic turning gear without on-site operation, realizes remote operation, solves the problem of lower efficiency.

Description

Technical Field

[0001] This invention relates to a turning mechanism, and more specifically, to a fully automatic turning device for a gas blower and its method of use. Background Technology

[0002] Steam turbine units or large blower units are used in industries such as power generation, petrochemicals, and coking. During shutdown, these units are cooled due to temperature drops. Uneven cooling of the cylinder and upper / lower rotor can cause thermal bending of the rotor after it stops rotating. In such cases, restarting the turbine can easily lead to friction between the moving and stationary parts, resulting in vibrations exceeding permissible limits. Alternatively, during long-term shutdowns, the rotor is prone to bending and deformation, disrupting its dynamic balance. To prevent such accidents, steam turbines and large blowers are equipped with a turning gear mechanism. When the turning gear mechanism is engaged, it allows the rotor to rotate continuously and cool evenly, thus preventing rotor bending. Condensing steam turbines also require the turning gear mechanism to be engaged before startup to prevent rotor bending caused by steam supplied through the shaft seals. Coking gas blowers also require the turning gear mechanism to be engaged after shutdown to prevent tar adhering to the impeller surface from flowing downwards and solidifying at the bottom, causing rotor imbalance.

[0003] Existing patent applications, such as patent publication number CN208094382U, disclose a turning gear mechanism, including a motor, reducer, locking nut, washer one, gear, first shaft, shaft elastic retaining ring, ball bearing, crescent flange, hex socket head cap screw, key, flange, housing, nut, second shaft, washer two, handle, grip, pad, sleeve, locking washer, cylindrical pin, fixing plate, limit switch, and washer. The beneficial effects of this utility model are: the turning gear mechanism has a reduction structure and a precise clutch to control the engagement and disengagement of the turning gear mechanism. During startup, the pinion gear of the turning gear mechanism meshes correctly with the large transmission gear of the diesel generator. When the diesel generator has finished starting, the pinion gear of the turning gear mechanism must disengage in a timely and correct manner. The mechanical parts of the turning gear mechanism must remain secure and not loose or fall off, ensuring the safe operation of the diesel generator. This turning gear mechanism is designed with a locking nut. The design of the shifted gear makes the meshing performance more precise, better, and more robust.

[0004] For example, patent publication number CN204186832U discloses a clutch for an automatic turning mechanism. The automatic turning mechanism is connected to a dynamometer, which is used to test an engine mounted on a test bench. The clutch includes: a driving disc, one end of which has multiple teeth and grooves spaced circumferentially, and the other end of which has a flange-shaped annular groove; the center hole of the driving disc is splinedly connected to the output shaft of the automatic turning mechanism; a driven disc, the outer circumferential surface of which has multiple teeth and grooves that mesh with the driving disc; the center hole of the driven disc is splinedly connected to the main shaft of the dynamometer; and a manual lever, which is fixed in the flange-shaped annular groove during operation. This invention utilizes the meshing action of the teeth and grooves to achieve forward and reverse power transmission during turning, enabling precise turning while reducing worker labor intensity and improving work efficiency.

[0005] However, due to the sound insulation devices and small internal space of the blower, manual switching is not only troublesome but also inefficient. In emergency switching of the blower, the turning gear mechanism often cannot automatically engage or disengage, resulting in a long switching time and causing additional gas release environmental accidents. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fully automatic turning gear device for gas blowers and its usage method. This fully automatic turning gear mechanism is applicable to various turning speeds, requires no on-site operation, enables remote operation, and solves the problem of low efficiency in existing technologies.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides a fully automatic turning gear device for a gas blower, comprising a PLC control mechanism, a power mechanism, and a turning gear mechanism;

[0009] The PLC control mechanism adopts a PLC control cabinet;

[0010] The power mechanism includes an explosion-proof variable frequency motor and a reducer connected to the explosion-proof variable frequency motor;

[0011] The explosion-proof variable frequency motor is connected to the PLC control cabinet;

[0012] The turning mechanism includes a clutch, a pawl transmission mechanism, a speed sensor, and a limit sensor;

[0013] The clutch is connected to the reducer;

[0014] The pawl transmission mechanism is located inside the clutch and is used to drive the rotation of the clutch;

[0015] The speed sensor is located on one side of the clutch and connected to the PLC control cabinet to detect the speed of the clutch.

[0016] The limit sensor is located on one side of the clutch and connected to the PLC control cabinet to detect the engagement / disengagement of the clutch.

[0017] Preferably, the clutch includes a housing, and an outer gear sleeve and an inner gear sleeve disposed within the housing;

[0018] One end of the outer gear sleeve is connected to the reducer, and the other end is connected to one end of the inner gear sleeve through the ratchet transmission mechanism;

[0019] The other end of the internal gear sleeve is connected to the blower.

[0020] Preferably, the speed sensor is located on the outer side of the other end of the inner toothed sleeve.

[0021] Preferably, the limit sensor includes two sets of limit switches;

[0022] The two sets of limit switches are symmetrically arranged on the outer shell, and the detection end of the limit switch extends into the outer shell toward the meshing point of the outer toothed sleeve and the inner toothed sleeve.

[0023] A set of limit switches is used to detect the engagement of the outer toothed sleeve and the inner toothed sleeve;

[0024] Another set of limit switches is used to detect the disengagement of the outer toothed sleeve from the inner toothed sleeve.

[0025] The second aspect of the present invention provides a method of using the fully automatic turning device for a gas blower based on the first aspect of the present invention, including a turning stop mode and an automatic turning mode.

[0026] Preferably, the turning stop mode specifically includes:

[0027] When the explosion-proof variable frequency motor stops operating, the outer gear sleeve and the inner gear sleeve lose contact, causing the clutch to be in a disengaged state.

[0028] Preferably, the turning stop mode specifically includes:

[0029] The PLC control mechanism issues a stop command to cut off the power supply to the explosion-proof variable frequency motor, and the explosion-proof variable frequency motor stops working.

[0030] At this time, due to the inertial rotation of the blower rotor, the inner gear sleeve of the clutch becomes the driving wheel, while the outer gear sleeve of the clutch becomes the driven wheel. The outer gear sleeve is brought from the engaged state to the disengaged state by the inner gear sleeve. The limit switch detects the disengagement signal of the clutch and automatically cuts off the power supply to the turning mechanism, stopping the turning.

[0031] Preferably, the automatic manual control mode specifically includes:

[0032] The PLC control mechanism issues an engagement command for the turning mechanism. The speed sensor detects whether the speed signal of the clutch is zero. If it is zero, the explosion-proof variable frequency motor is started, driving the reducer. At this time, the outer gear sleeve of the clutch starts to rotate with the reducer and engages with the inner gear sleeve of the clutch through the pawl transmission mechanism.

[0033] At the same time, the limit switch detects the engagement signal of the clutch and issues a turning command, which drives the rotor of the blower to rotate.

[0034] This invention provides a fully automatic turning gear device and its usage method for gas blowers, solving the problems of high labor intensity, small working space, inconvenient operation, and inability to remotely and automatically operate current gas blower turning gear mechanisms. Steam turbine units or large blower units in industries such as power, petrochemicals, and coking all require turning gear mechanisms. Therefore, this invention has significant practical application value. It also has the following beneficial effects:

[0035] 1) High efficiency: The turning mechanism engages and disengages automatically, enabling remote operation from the control room;

[0036] 2) High safety performance: front and rear limit switches ensure that the turning mechanism can be engaged and disengaged in the correct positions before the turning mechanism can be turned or the main unit can be started, ensuring that the turning mechanism is not damaged; the main unit shaft has a speed sensor, and the turning mechanism can only be engaged when the main unit is completely stopped, ensuring that the turning mechanism is not subject to accidental wear.

[0037] 3) Scientific and reasonable: The PLC adopts frequency conversion control. Low frequency speed is used when the turning mechanism is engaged and disengaged, and power frequency speed is used during normal turning.

[0038] 4) High adaptability: The turning gear motor adopts a variable frequency motor, which can be used to meet various turning gear speed requirements. Attached Figure Description

[0039] Figure 1 This is a schematic front view of the fully automatic turning device of the present invention;

[0040] Figure 2 This is a schematic diagram of the left side of the fully automatic turning device of the present invention;

[0041] Figure 3 This is a top view schematic diagram of the fully automatic turning device of the present invention. Detailed Implementation

[0042] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] Combination Figures 1 to 3 As shown, the present invention provides a fully automatic turning gear device for a gas blower, including a PLC control mechanism, a power mechanism and a turning gear mechanism;

[0044] The PLC control mechanism uses a PLC control cabinet to control the overall operation of the fully automatic turning gear device of this invention. The main hardware components of the PLC control cabinet include a PLC display, a frequency converter, and other electrical components. The software component mainly consists of the control program, which includes: checking the position of the turning gear mechanism; detecting and determining whether the main unit is in a stopped state, and if so, automatically engaging the turning gear mechanism; starting the turning gear operation after the limit switch is detected to be in position; stopping the turning gear operation after the PLC control cabinet receives an external stop turning gear command; and automatically disengaging the turning gear mechanism if the main unit is in a stopped state.

[0045] This automatic control system enables remote operation of the turning mechanism, allowing for automatic switching of the gas blower.

[0046] The power mechanism includes an explosion-proof variable frequency motor 1 and a reducer 2 connected to the explosion-proof variable frequency motor 1.

[0047] The explosion-proof variable frequency motor 1 is connected to the PLC control cabinet to receive control commands. After being powered on, the explosion-proof variable frequency motor 1 runs and is decelerated by the reducer 2, driving the turning mechanism to perform actions such as turning, turning, and disengaging.

[0048] The turning mechanism includes a clutch 3, a ratchet transmission mechanism 4, a speed sensor 5, and a limit sensor 6.

[0049] Clutch 3 is connected to reducer 2.

[0050] The clutch 3 includes a housing 31, and an outer gear sleeve 32 and an inner gear sleeve 33 disposed within the housing 31.

[0051] One end of the outer gear sleeve 32 is connected to the reducer 2, and the other end is connected to one end of the inner gear sleeve 33 through the pawl transmission mechanism 4 to form a meshing transmission.

[0052] The other end of the internal gear sleeve 33 is connected to the rotor of the blower.

[0053] The speed sensor 5 is located on the outer side of the other end of the inner toothed sleeve 33.

[0054] Limit sensor 6 includes two sets of limit switches: one set for when the turning gear is engaged; and the other set for when it is disengaged. Engagement and disengagement of the turning gear mechanism are initiated by commands from the PLC control cabinet to the frequency converter, which starts the explosion-proof variable frequency motor 1 at low frequency. The reducer 2 then operates the ratchet transmission mechanism 4 to engage or disengage. Once the limit switches detect that the turning gear mechanism is engaged, the turning gear mechanism can be activated for normal turning operations.

[0055] Two sets of limit switches are symmetrically arranged on the outer casing 31. The detection end of the limit switch extends into the outer casing 31 towards the meshing point between the outer toothed sleeve 32 and the inner toothed sleeve 33.

[0056] A set of limit switches is used to detect the engagement of the outer gear sleeve 32 and the inner gear sleeve 33.

[0057] Another set of limit switches is used to detect the separation of the outer toothed sleeve 32 and the inner toothed sleeve 33.

[0058] The present invention also provides a method of using the fully automatic turning device based on the present invention, including a turning stop mode and an automatic turning mode.

[0059] The specific stop modes include:

[0060] When the explosion-proof variable frequency motor 1 stops operating, the outer gear sleeve 32 and the inner gear sleeve 33 lose contact, causing the clutch to be in a disengaged state.

[0061] The automatic turning mode specifically includes:

[0062] The PLC control mechanism issues a turning gear engagement command. The speed sensor 5 detects whether the speed signal of the clutch 3 is zero. If it is zero, the explosion-proof variable frequency motor 1 is started, driving the reducer 2. At this time, the outer gear sleeve 32 of the clutch 3 starts to rotate with the reducer 2. Under the action of the pawl transmission mechanism 4 installed in the inner gear sleeve 33, it slides from the "disengaged position" to the "engaged position" along the spiral line. At the same time, the position limit switch receives the engagement signal of the clutch 3 and issues a turning gear command. The engagement of the clutch 3 drives the rotor of the gas blower to rotate continuously and at a constant speed.

[0063] If the signal detected by speed sensor 5 is not zero, the circuit can only be entered after the explosion-proof variable frequency motor 1 stops running.

[0064] When stopping the electric turning gear, a stop turning gear command can also be issued, specifically including:

[0065] The PLC control mechanism issues a stop command to cut off the power supply to the explosion-proof variable frequency motor 1, and the explosion-proof variable frequency motor 1 stops working.

[0066] At this time, due to the inertial rotation of the blower rotor, the inner gear sleeve 33 of the clutch 3 becomes the driving wheel, while the outer gear sleeve 32 of the clutch 3 becomes the driven wheel. The outer gear sleeve 32 is brought from the engaged state to the disengaged state by the inner gear sleeve 33. The limit switch detects the disengagement signal of the clutch 3 and automatically cuts off the power supply to the turning gear mechanism, stopping the turning gear.

[0067] Alternatively, a low-frequency speed disengagement mode can be set. In this mode, after the turning motor stops working, when the signal detected by the speed sensor 5 is zero, the explosion-proof variable frequency motor 1 is started. The explosion-proof variable frequency motor 1 drives the reducer 2 to start working at a low frequency speed. At this time, the outer gear sleeve 32 of the clutch 3 starts to rotate with the reducer 2. Under the action of the pawl transmission mechanism 4 installed in the inner gear sleeve 33, it slides from the "engaged position" to the "disengaged position" along the spiral line. After the limit switch sends the disengagement signal of the clutch 3, the explosion-proof variable frequency motor 1 stops running.

[0068] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A fully automatic turning gear device for a gas blower, characterized in that: Includes PLC control mechanism, power mechanism and turning mechanism; The PLC control mechanism adopts a PLC control cabinet; The power mechanism includes an explosion-proof variable frequency motor and a reducer connected to the explosion-proof variable frequency motor; The explosion-proof variable frequency motor is connected to the PLC control cabinet; The turning mechanism includes a clutch, a pawl transmission mechanism, a speed sensor, and a limit sensor; The clutch is connected to the reducer; The pawl transmission mechanism is located inside the clutch and is used to drive the rotation of the clutch; The speed sensor is located on one side of the clutch and connected to the PLC control cabinet to detect the speed of the clutch. The limit sensor is located on one side of the clutch and connected to the PLC control cabinet to detect the engagement / disengagement of the clutch.

2. The fully automatic turning gear device for a gas blower according to claim 1, characterized in that: The clutch includes a housing, and an outer gear sleeve and an inner gear sleeve disposed within the housing. One end of the outer gear sleeve is connected to the reducer, and the other end is connected to one end of the inner gear sleeve through the ratchet transmission mechanism; The other end of the internal gear sleeve is connected to the blower.

3. The fully automatic turning gear device for a gas blower according to claim 2, characterized in that: The speed sensor is located on the outer side of the other end of the inner toothed sleeve.

4. The fully automatic turning gear device for a gas blower according to claim 2, characterized in that: The limit sensor includes two sets of limit switches; The two sets of limit switches are symmetrically arranged on the outer shell, and the detection end of the limit switch extends into the outer shell toward the meshing point of the outer toothed sleeve and the inner toothed sleeve. A set of limit switches is used to detect the engagement of the outer toothed sleeve and the inner toothed sleeve; Another set of limit switches is used to detect the disengagement of the outer toothed sleeve from the inner toothed sleeve.

5. A method of using a fully automatic turning gear device for a gas blower based on any one of claims 1-4, characterized in that: It includes a manual rotation stop mode and an automatic manual rotation mode.

6. The method of use according to claim 5, characterized in that, The specific modes for stopping the turning gear include: When the explosion-proof variable frequency motor stops operating, the outer gear sleeve and the inner gear sleeve lose contact, causing the clutch to be in a disengaged state.

7. The method of use according to claim 5, characterized in that, The specific modes for stopping the turning gear include: The PLC control mechanism issues a stop command to cut off the power supply to the explosion-proof variable frequency motor, and the explosion-proof variable frequency motor stops working. At this time, due to the inertial rotation of the blower rotor, the inner gear sleeve of the clutch becomes the driving wheel, while the outer gear sleeve of the clutch becomes the driven wheel. The outer gear sleeve is brought from the engaged state to the disengaged state by the inner gear sleeve. The limit switch detects the disengagement signal of the clutch and automatically cuts off the power supply to the turning mechanism, stopping the turning.

8. The method of use according to claim 5, characterized in that, The automatic vehicle control mode specifically includes: The PLC control mechanism issues an engagement command for the turning mechanism. The speed sensor detects whether the speed signal of the clutch is zero. If it is zero, the explosion-proof variable frequency motor is started, driving the reducer. At this time, the outer gear sleeve of the clutch starts to rotate with the reducer and engages with the inner gear sleeve of the clutch through the pawl transmission mechanism. At the same time, the limit switch detects the engagement signal of the clutch and issues a turning command, which drives the rotor of the blower to rotate.

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