Auxiliary lifting device and method for power station gate

Abstract

The present invention belongs to the field of marine engineering system maintenance, and specifically relates to a power station gate auxiliary lifting device and method thereof. The device includes: a base, a lifting beam, a hydraulic cylinder, a hydraulic pump station, a gate hoisting chain, a pull rod positioning mechanism, and an adjustment mechanism. The hydraulic pump station is installed in the central through opening of the base, and support frames are symmetrically connected to the bottom surfaces of both sides of the base, and the pull rod positioning mechanism is installed on the support frames; the hydraulic cylinder is installed on both sides of the lower part of the base; the lifting beam is located directly above the base, and the adjustment mechanism is symmetrically connected on both sides of the lifting beam. The gate hoisting chain is detachably connected to the bottom of the adjustment mechanism. The device of the present invention can be directly connected to the isolation gate, and through hydraulic transmission, the isolation gate lifting operation can be realized underwater, effectively eliminating the problem of high water level difference under special circumstances, and smoothly realizing the isolation gate from the gate slot.

Description

Technical Field

[0001] The present invention belongs to the field of marine engineering system maintenance, and in particular relates to an auxiliary lifting device for a power station gate and a method thereof. Background Art

[0002] The first phase of the Tianwan Nuclear Power Station features two VVER-1000 units equipped with offshore systems and equipment to provide the final heat sink for the nuclear and conventional islands. These offshore systems include rotary filters, decontamination machines, and other critical equipment. These devices filter and remove debris from seawater to prevent blockage of downstream heat exchangers and reduce flow capacity, which could impact unit output.

[0003] Under normal circumstances, maintenance of these filtration systems requires only the use of a crane in the plant to lower the front and rear gates of the equipment under inspection into the gate slots to isolate the seawater. After draining the seawater from the channel between the front and rear gates, maintenance work can begin on key equipment such as the rotary filter and the decontamination machine. Once maintenance is complete, the front and rear isolation gates can be lifted out using the plant crane. However, in exceptional circumstances, such as a sudden rotary filter failure during unit operation, emergency repairs may be required without shutting down the unit. Such exceptional circumstances do exist, particularly in recent years, as the scope and frequency of human production activities have increased, and contaminants in seawater have increased. Many power plants in China have experienced sudden increases in contaminants (such as sargassum, hair shrimp, pen snails, laver, and enteromorpha), leading to failures of rotary or drum filters and consequent unit or equipment shutdowns. When a channel device fails while other channels remain operational—meaning the entire unit remains in full power mode—the level difference between the isolation gates before and after the faulty device can be high. There may be a situation where the factory crane is limited in its lifting capacity and cannot lift out the isolated and lowered gate.

[0004] Due to the limited bearing capacity of the civil engineering structure of the offshore engineering system and equipment plant, the effect of increasing the crane lifting capacity is limited. In order to solve the problem of insufficient lifting capacity of the existing plant crane, and to completely realize the completion of the repair of offshore engineering system fault equipment when the unit is operating at full power or without shutting down, and to ensure that the isolation gate can be lifted out in the seawater channel, it is urgent to develop a gate auxiliary lifting device for power stations. Summary of the Invention

[0005] The purpose of the present invention is to provide a power station gate auxiliary lifting device and method thereof, which can be directly connected to the isolation gate, and through hydraulic transmission, the isolation gate lifting operation can be realized underwater, effectively eliminating the problem of high water level difference under special circumstances, and smoothly lifting the isolation gate out of the gate slot.

[0006] The technical solution for achieving the purpose of the present invention is as follows:

[0007] An auxiliary lifting device for a power station gate, the device comprising: a base, a hanging beam, a hydraulic cylinder, a hydraulic pump station, a gate lifting chain, a pull rod positioning mechanism and an adjustment mechanism; a hydraulic pump station is installed in a through opening in the middle of the base; support frames are symmetrically connected to the bottom surfaces of both sides of the base, and the pull rod positioning mechanism is installed on the support frames; the hydraulic cylinder is installed on both sides of the lower part of the base; the hanging beam is located directly above the base, and the adjustment mechanism is symmetrically connected on both sides of the hanging beam, and the gate lifting chain is detachably connected to the bottom of the adjustment mechanism.

[0008] The pull rod positioning mechanism includes a pull rod and a positioning block. The positioning block is located at the bottom inner side of the support frame. The pull rod is inserted from the top of the support frame to the inner side of the support frame. The bottom of the pull rod is fixedly connected to the positioning block.

[0009] The pull rod is provided with a pin hole matching the limit pin. The position of the pull rod is fixed on the support frame by inserting the limit pin into the pin hole of the pull rod.

[0010] The adjustment mechanism includes a tensioning screw and a tensioning nut, which are located on both sides of the suspension beam. The tensioning nut and the tensioning screw are connected by threads and fixed above the suspension beam. The distance between the center lines of the tensioning screws on both sides is consistent with the center distance of the gate chains on both sides.

[0011] The gate hoisting chain is detachably connected to the lower side of the adjusting mechanism through the cooperation of a pin shaft and a positioning nut.

[0012] The device also includes a connecting plug, which is located on the upper surface of the top of the base and distributed on both sides. The connecting plug is fixed to the base through fixing nuts and fasteners. The base and the hanging beam transmit the hydraulic lifting force on the base to the hanging beam through the connecting plug.

[0013] The device also includes lifting ears, which are symmetrically arranged above the base and are fixedly connected to the base.

[0014] The device also includes a lifting shaft hole, and the lifting shaft hole is provided at the middle position of the middle raised part of the lifting beam.

[0015] The device also includes a shaft baffle, which is connected to the lower part of the lifting shaft hole at the top of the lifting beam.

[0016] The hydraulic cylinder is fixed below the base through a fixing block.

[0017] The device also includes a storage rack, the base is placed flat on the storage rack, and the hanging beam is placed flat on the base.

[0018] A lifting method for a power station gate auxiliary lifting device, the method comprising the following steps:

[0019] Step 1: Install the gate auxiliary lifting device;

[0020] Step 2: Install the gate hoisting chain onto the gate auxiliary lifting device;

[0021] Step 3: Lift the gate using the gate auxiliary lifting device and fix the gate on the gate slot;

[0022] Step 4: Remove the gate auxiliary lifting device.

[0023] The step 1 comprises:

[0024] Step 1.1: Install the base above the gate and check and adjust the base;

[0025] Step 1.2, check the hydraulic pump station;

[0026] Step 1.3, check the hydraulic cylinder;

[0027] Step 1.4: Install the hanging beam above the base.

[0028] The step 3 comprises:

[0029] Step 3.1a: Use the electric oil pump to lift the gate and fix it in the gate slot, or,

[0030] Step 3.1b: Use the manual oil pump to lift the gate and fix it on the gate slot.

[0031] The beneficial technical effects of the present invention are:

[0032] 1. The auxiliary lifting device for power station gates of the present invention can realize the lifting operation of the isolation gate underwater through hydraulic transmission, effectively eliminating the problem of high water level difference under special circumstances; and the hydraulic transmission is stable, the bearing capacity can be arbitrarily adjusted, and automatic overload protection is provided.

[0033] 2. The lifting point of the upper beam of the auxiliary lifting device for power station gates of the present invention can be connected to any position of the lifting chain, and the lifting point of the beam is equipped with an adjustable structure to eliminate the length error of the chain. The lifting chain is connected by a pin shaft, which is convenient for disassembly and installation.

[0034] 3. In addition to the electric oil pump, the auxiliary lifting device for the power station gate of the present invention is also equipped with a manual oil pump. The manual oil pump is combined with the manual push rod of the reversing valve, so that the equipment can achieve underwater lifting of the gate even without power supply.

[0035] 4. The structural design of the auxiliary lifting device for power station gates of the present invention fully considers the on-site space conditions and is equipped with a pull rod positioning mechanism to ensure the alignment of the auxiliary lifting device body and the gate slot, thereby improving the safety of the lifting operation and avoiding the occurrence of crooked pulling and slanted lifting that violates the lifting operation specifications.

[0036] 5. The power station gate auxiliary lifting device of the present invention is provided with a storage rack for daily storage and transportation of the gate auxiliary lifting device. In order to protect the hydraulic cylinder, the base needs to be installed on the storage rack for transportation, and the lifting and transportation operations are relatively simple and quick.

[0037] 6. The power station gate auxiliary lifting device of this invention has an effective rated load of 35 tons and can provide a maximum lifting force of 35 tons, far exceeding the lifting capacity of a crane. This device can effectively lift the gate to a distance of 1.2 meters, meeting the lifting needs of offshore gates in special circumstances.

[0038] 7. The auxiliary lifting device for power station gates of the present invention has a compact structure and occupies a small space, effectively saving on-site maintenance and operation space, and does not interfere with other on-site equipment;

[0039] 8. The main load-bearing structures of the auxiliary lifting device for power station gates of the present invention, such as the base, hanging beam, tensioning screw and adjusting nut, have undergone stress analysis and are not prone to deformation during long-term use. Their structural strength and safety factor meet the requirements of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic structural diagram of a power station gate auxiliary lifting device provided by the present invention;

[0041] Figure 2 This is a schematic diagram of the connection between the adjustment mechanism and the gate hoisting chain in the auxiliary lifting device for a power station gate provided by the present invention;

[0042] Figure 3 This is a schematic diagram of the installation of a pull rod positioning mechanism in a power station gate auxiliary lifting device provided by the present invention into a gate slot;

[0043] Figure 4 This is a schematic structural diagram of the middle connecting plate on the gate hoisting chain in the power station gate auxiliary lifting device provided by the present invention;

[0044] Figure 5 This is a structural schematic diagram of an I-beam in an auxiliary lifting device for a power station gate provided by the present invention.

[0045] In the figure: 1-base; 2-lifting beam; 3-lifting shaft hole; 4-shaft baffle; 5-connecting plug; 6-fixing nut; 7-fastener; 8-fixing block; 9-hydraulic cylinder; 10-storage rack; 11-hydraulic pump station; 12-lifting ear; 13-tensioning screw; 14-tensioning nut; 15-gate lifting chain; 16-pin shaft; 17-locating nut; 18-pull rod; 19-locating block; 20-limit pin; 21-gate slot. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] like Figure 1 As shown, the present invention provides an auxiliary lifting device for a power station gate, which includes: a base 1, a hanging beam 2, a connecting plug 5, a fixing nut 6, a fastener 7, a fixing block 8, a hydraulic cylinder 9, a storage rack 10, a hydraulic pump station 11, a lifting lug 12, an adjustment mechanism, a gate lifting chain 15, a pin 16, a positioning nut 17, and a pull rod positioning mechanism; wherein the adjustment mechanism includes a tensioning screw 13 and a tensioning nut 14; the pull rod positioning mechanism includes a pull rod 18, a positioning block 19 and a limit pin 20.

[0048] The base 1 is a rectangular parallelepiped structure with a central opening through which a hydraulic pump station 11 is fixedly connected. Rectangular support frames are symmetrically fixed to the undersides of the base 1 on both sides. These support frames are positioned above the gate slot 21 and provide support for the reaction force when the hydraulic pump station lifts the gate. A pull rod positioning mechanism is mounted on the support frame to center the gate auxiliary lifting device within the gate slot, ensuring safety and enhancing its effectiveness.

[0049] like Figure 3 As shown, the pull rod positioning mechanism includes a pull rod 18, a positioning block 19 and a limit pin 20. The positioning block 19 is located at the bottom inner side of the support frame. The pull rod 18 is inserted from the top of the support frame to the inner side of the support frame. The bottom of the pull rod 18 is fixedly connected to the positioning block 19. The pull rod 18 is provided with a pin hole matching the limit pin 20. By inserting the limit pin 20 into the pin hole of the pull rod 18, the position of the pull rod 18 is fixed on the support frame.

[0050] The lifting lugs 12 are symmetrically arranged above the base 1 . The lifting lugs 12 are fixedly connected to the base 1 and are used for lifting and transporting the base 1 itself.

[0051] The suspension beam 2 is a rectangular parallelepiped structure with a raised center. The suspension beam 2 is located directly above the base 1. The connecting plugs 5 are located on the upper surface of the top of the base 1 and are distributed on both sides. They are mainly used to lift the suspension beam 2 to a certain height. The connecting plugs 5 are fixed to the base 1 via fixing nuts 6 and fasteners 7, so that the connecting plugs 5 and the base 1 are connected as a whole. The suspension beam 2 is located above the base 1 and is separate from the base 1 and the plugs 5. However, under the action of hydraulic pressure, the plugs 5 lift the suspension beam 2 to a certain height. The base 1 and the suspension beam 2 transmit the hydraulic lifting force on the base 1 to the suspension beam 2 through the connecting plugs 5. The fixing block 8 is used to fix the hydraulic cylinder 9.

[0052] A lifting axle hole 3 is located in the middle of the raised portion of the lifting beam 2. This is used for lifting and transporting the beam itself. A shaft baffle 4 is connected to the bottom of the lifting axle hole 3 at the top of the lifting beam 2 to position the crane hook and ensure that the crane hook is smoothly connected to the axle hole 3.

[0053] The lifting beam 2 is used for gate connection. During operation, the first step is to install the base 1 to the gate slot, then use the crane to connect the shaft hole 3, install the lifting beam 2 to the base 1, and then connect the lifting lug 2 and the gate.

[0054] like Figure 2 As shown, adjustment mechanisms are symmetrically provided on both sides of the suspension beam 2, and the adjustment mechanisms are connected to the suspension beam 2. A pin 16 is provided at the lower part of the adjustment mechanism passing through the pin 16, and a positioning nut 17 matches the pin 16. The positioning nut 17 is sleeved on the free end of the pin 16. The pin 16 is installed on the adjustment mechanism by tightening the positioning nut 17 on the pin 16.

[0055] The gate hoisting chain 15 is located below the adjustment mechanism. The top end of the gate hoisting chain 15 is mounted on a pin 16. The pin 16 and the positioning nut 17 cooperate to achieve a detachable connection between the gate hoisting chain 15 and the adjustment mechanism. The bottom end of the gate hoisting chain 15 is mounted on the gate and is detachably connected to the gate. Through the cooperation of the adjustment mechanism and the gate hoisting chain 15, the gate is lifted to a certain height, eliminating the liquid level difference and finally lifting the gate.

[0056] like Figure 1 As shown, the adjustment mechanism includes a tensioning screw 13 and a tensioning nut 14. The tensioning screw 13 and the tensioning nut 14 are located on both sides of the suspension beam 2 and on the upper surface of the suspension beam 2. The tensioning screw 13 is threaded. The tensioning nut 14 and the tensioning screw 13 are connected by threads and fixed above the suspension beam 2. The distance between the center lines of the tensioning screws 13 on both sides is consistent with the center distance of the gate chains 15 on both sides, so as to realize upper and lower lifting.

[0057] The chain is tightened by the adjustment mechanism to facilitate subsequent lifting. If there is an error in the chain length, the adjustment structure can eliminate the error in the chain length on both sides of the gate, thereby ensuring the centering of the lifting work and ensuring that the gate does not deflect or get stuck in the gate slot during lifting.

[0058] The hydraulic cylinder 9 is located on both sides of the lower part of the base 1 . The hydraulic cylinder 9 is fixed below the base 1 through a fixing block 8 , so that the hydraulic cylinder 9 and the base 1 are connected as a whole through the fixing block 8 .

[0059] The hydraulic cylinder 9 is electrically connected to the hydraulic pump station 11 .

[0060] The hydraulic pump station 11 primarily includes a level and temperature gauge, an air filter, an oil suction filter, a three-phase asynchronous oil pump motor, a high-pressure gear pump, a manual hydraulic pump, a check valve, a high-pressure oil filter, a pressure gauge, a relief valve, a solenoid directional control valve, a synchronous diverter motor, a two-way hydraulically controlled check valve, and a hydraulic cylinder. The hydraulic pump station uses 46-grade anti-wear hydraulic oil as its working medium, and the system provides an output pressure of 0-20 MPa. A manual push rod installed in the solenoid directional control valve spool allows the oil pump to be activated for automatic pressure increase or for manual pressure increase. Manual operation is primarily used to achieve pressure output in the event of a power outage, using the manual push rod in conjunction with the manual hydraulic pump. Once the oil pump is started and pressure output stabilizes, the hydraulic cylinder 9 begins to extend upward under the action of the oil pressure. Connecting the plug 5, the lifting beam 2 is lifted. The adjustment mechanism on the lifting beam 2 is connected to the gate lifting chain 15. After the gate is lifted underwater to a certain height, the difference in liquid level before and after the gate disappears, allowing the gate to be smoothly lifted out.

[0061] The electrical equipment in this device includes circuit breakers, thermal relays, power indicator lights, three-phase asynchronous motors, switching power supplies, AC contactors, operating button boxes, relays, and reversing valve plug assemblies. The electrical circuit's primary function is to supply power to the three-phase asynchronous motor and solenoid reversing valve, activating these devices to provide pressure head for the hydraulic system and maintain a stable operating state.

[0062] The storage rack 10 is a rectangular metal frame structure used to support the weight of the base 1 and the hanging beam 2. The upper surface of the storage rack 10 is flat and can directly store the base 1. The lower surface of the storage rack 10 is also flat and can be placed directly on the ground, and the structure is relatively stable. The base 1 and the storage rack 10 are two separate components. The base 1 is placed flat on the storage rack 10, and the hanging beam 2 is placed flat on the base 1. Therefore, the storage rack 10 bears the weight of the base 1 and the hanging beam 2. The storage rack 10 is used for daily storage and transportation of gate auxiliary lifting devices. In order to protect the hydraulic cylinder, the base 1 needs to be installed on the storage rack 10 for transportation. The lifting and transportation operations are relatively simple and quick.

[0063] The present invention provides a lifting method for a power station gate auxiliary lifting device, which specifically includes the following steps:

[0064] Step 1: Install the gate auxiliary lifting device

[0065] Step 1.1, install the base 1 above the gate, and check and adjust the base 1;

[0066] The gate auxiliary lifting device is transported to the use site, and the lifting beam 2 and the base 1 are separated;

[0067] Lift the pull rod positioning mechanism and insert the limit pin 20;

[0068] Lift the base 1 above the gate, aligning them roughly with the gate. When the bottom surface of the base 1 is 20-100 mm from the ground, remove the limit pin 20, insert the pull rod positioning mechanism into the gate slot, and place the base 1 on the ground.

[0069] Check and adjust the base 1 to make it basically level and without shaking. If the levelness of the base 1 does not meet the requirements or there is shaking, it is necessary to use shims to adjust it until it meets the requirements;

[0070] Step 1.2, check the hydraulic pump station 11

[0071] Insert the plug of the hydraulic pump station 11 into the power distribution cabinet to connect the hydraulic pump station 11 to electricity;

[0072] Check the oil tank level of the hydraulic pump station 11 and refill it if it does not meet the oil level line;

[0073] When inching the three-phase asynchronous oil pump motor of the hydraulic pump station 11, its direction of rotation should be consistent with the direction of rotation marked on the rear cover. Adjust the phase sequence if necessary. After pressing the motor start button, press the stop button immediately to prevent the motor from rotating in the opposite direction for a long time and damaging the hydraulic components.

[0074] Step 1.3, check the hydraulic cylinder 9

[0075] Inching the three-phase asynchronous oil pump motor of the hydraulic pump station 11 or operating the manual hydraulic pump, extending the hydraulic cylinder 9 to a certain distance without load and then retracting it, repeating three times to ensure that the extension and retraction functions of the hydraulic cylinder 9 are normal;

[0076] Step 1.4: Install beam 2 above base 1

[0077] The lifting beam 2 is lifted through the lifting shaft hole 3 and installed just above the base 1 .

[0078] Step 2: Install the gate hoisting chain 15 onto the gate auxiliary lifting device

[0079] Rotate the tensioning nut 14 on the hanging beam 2 to lower the tensioning screw 13 by a certain distance;

[0080] Remove the pin 16 on the tensioning screw 13, install the gate hoisting chain 15 on the pin 16, and then reinstall the pin 16. The gate hoisting chain 15 should be straightened as much as possible during installation;

[0081] Rotate the tensioning nut 14 to straighten the tensioning screw 13. After the tensioning nut 14 is tightened, the torque should remain consistent.

[0082] Step 3: Lift the gate using the gate auxiliary lifting device and fix the gate on the gate slot

[0083] Step 3.1a: Use the electric oil pump to lift the gate and fix it on the gate slot.

[0084] Press the start button to start the oil pump motor;

[0085] Adjust the relief valve and preset the hydraulic system pressure, which is also the preset lifting force of the gate auxiliary lifting device. Turn the relief valve handwheel in to increase the pressure. Observe the system pressure using a pressure gauge. The hydraulic system pressure is proportional to the equipment lifting force. Equipment lifting force (tons·force) = system pressure (Mpa) × 1.75 tons·force / Mpa. The hydraulic system pressure setting must not exceed 20Mpa. The hydraulic system pressure should be increased step by step. When the equipment cannot lift the gate, increase the system pressure.

[0086] Press the "Up" button to start the hydraulic cylinder 9 lifting the gate via the gate hoisting chain 15. As the equipment load increases, the pressure gauge reading increases, allowing you to estimate the lifting force. If the pressure gauge reading does not increase, the hydraulic system's preset pressure has been reached. If the hydraulic cylinder 9 stops outputting, increase the system pressure appropriately before continuing to lift the gate.

[0087] When the gate is lifted to a certain height, confirm that the level difference on both sides of the gate has been eliminated, and use a crane to lift the lifting beam 2 together with the gate lifting chain 15 and the gate through the lifting beam axis until the middle connecting plate of the gate lifting chain 15 is exposed on the ground, and insert the Figure 5 The I-beam shown in the figure fixes the gate to the gate slot. The intermediate connecting plate structure on the gate hoisting chain 15 is as shown in the figure. Figure 4 As shown, since the gate hoisting chain 15 is more than ten meters long, the middle connecting plate is in the middle position of the gate hoisting chain 15 and is integrated with the chain, and a long height needs to be hoisted. Figure 2 Not displayed in

[0088] Press the "down" button to fully retract the hydraulic cylinder 9 and complete the lifting of the gate;

[0089] or

[0090] Step 3.1b: Use the manual oil pump to lift the gate and fix it on the gate slot.

[0091] Screw the manual operating rod into the threaded interface of the manual pump and tighten the lock nut;

[0092] Fully rotate the manual push rod of the reversing valve and continue to operate the joystick. The reading of the hydraulic system pressure gauge will gradually increase.

[0093] Adjust the relief valve and preset the hydraulic system pressure, that is, preset the lifting force of the gate auxiliary lifting device. Screw in the relief valve handwheel to increase the pressure, and observe the system pressure through the pressure gauge. The hydraulic system pressure is proportional to the lifting force of the equipment. Equipment lifting force (tons·force) = system pressure (Mpa) × 1.75 tons·force / Mpa. The hydraulic system pressure setting shall not exceed 20Mpa. The hydraulic system pressure should be increased step by step. When the equipment cannot lift the gate, increase the system pressure. When adjusting the pressure of the hydraulic system, the operation of the manual pump should not be stopped;

[0094] Screw in the manual push rod for lifting and continuously operate the manual pump. The equipment starts to lift the gate through the gate hoisting chain 15.

[0095] As the load on the equipment increases, the pressure gauge reading increases, which can be used to estimate the gate's lifting force. If the pressure gauge reading does not increase, it means the hydraulic system has reached its preset pressure. If the hydraulic cylinder 9 stops outputting pressure at this point, adjust the relief valve appropriately to increase the system pressure before continuing to lift.

[0096] When the gate is lifted to a certain height, confirm that the liquid level difference on both sides of the gate has been eliminated, and use a crane to lift the lifting beam 2 together with the gate lifting chain 15 and the gate through the lifting beam axis until the middle connecting plate of the gate lifting chain 15 is exposed to the ground, and insert the I-beam to fix the gate on the gate slot;

[0097] Fully rotate the lifting manual push rod out, screw in the lowering manual push rod, and continuously operate the manual pump to fully retract the hydraulic cylinder 9 to complete the lifting of the gate;

[0098] Step 4: Remove the gate auxiliary lifting device

[0099] The crane descends, lowers the hanging beam, and installs the hanging beam back on the base. While the crane is descending, install the gate chain back to the gate wellhead and remove the gate lifting chain 15 from the pin 16 of the hanging beam 2;

[0100] Pull out the two sets of positioning mechanisms on both sides of the base 1 and insert the limit pins 20; use a crane to remove the auxiliary lifting device through the four lifting ears 12 on the base 1 and fix it on the storage rack 10.

[0101] The gate-assisted lifting device solves the problem of power plant isolation gates being unable to be lifted from the seawater channel under special circumstances. This device uses a hydraulic transmission to lift the gate to a certain height, eliminating the water level difference on both sides of the gate. This allows equipment maintenance to be performed without stopping the power plant or at full power, thereby improving the economic efficiency of power plant unit operation and the safety of on-site lifting operations. It also avoids economic losses such as equipment damage caused by excessive pulling due to insufficient crane load capacity.

[0102] The device of the present invention can be widely used in the isolation and release of gates in marine systems of nuclear and thermal power plants. It can also be used to hoist other similar equipment in power plants. Furthermore, the device of the present invention provides valuable reference for the hoisting of similar equipment in the same industry or other industries under sudden abnormal conditions such as underwater or underground.

[0103] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A power station gate auxiliary lifting device, characterized in that: The device comprises: a base (1), a hanging beam (2), a hydraulic oil cylinder (9), a hydraulic pump station (11), a gate hoisting chain (15), a pull rod positioning mechanism and an adjustment mechanism, wherein the hydraulic pump station (11) is installed in a through opening in the middle of the base (1), support frames are symmetrically connected to the bottom surfaces of both sides of the base (1), and the pull rod positioning mechanism is installed on the support frames; the hydraulic oil cylinder (9) is installed on both sides of the lower part of the base (1); the hanging beam (2) is located directly above the base (1), and the adjustment mechanism is symmetrically connected to both sides of the hanging beam (2), and the gate hoisting chain (15) is detachably connected to the bottom of the adjustment mechanism; The pull rod positioning mechanism includes a pull rod (18) and a positioning block (19), the positioning block (19) is located at the bottom of the inner side of the support frame, the pull rod (18) is inserted from the upper side of the support frame to the inner side of the support frame, and the bottom of the pull rod (18) is fixedly connected to the positioning block (19); The adjusting mechanism comprises a tensioning screw rod (13) and a tensioning nut (14), the tensioning screw rod (13) and the tensioning nut (14) are located on both sides of the hanging beam (2), the tensioning nut (14) and the tensioning screw rod (13) are connected by threads and fixed above the hanging beam (2), and the distance between the center lines of the tensioning screw rods (13) on both sides is consistent with the center distance of the gate hoisting chains (15) on both sides.

2. The auxiliary lifting device for power station gate according to claim 1, characterized in that: The pull rod (18) is provided with a pin hole matching the limit pin (20). By inserting the limit pin (20) into the pin hole of the pull rod (18), the position of the pull rod (18) is fixed on the support frame.

3. The auxiliary lifting device for power station gate according to claim 1, characterized in that: The gate hoisting chain (15) is detachably connected to the lower side of the regulating mechanism through the cooperation of a pin shaft (16) and a positioning nut (17).

4. The auxiliary lifting device for a power station gate according to claim 1, characterized in that: The device further comprises a connecting plug (5), which is located on the upper surface of the top of the base (1) and distributed on both sides. The connecting plug (5) is fixed to the base (1) through a fixing nut (6) and a fastener (7). The base (1) and the hanging beam (2) transmit the hydraulic lifting force on the base (1) to the hanging beam (2) through the connecting plug (5).

5. The auxiliary lifting device for power station gate according to claim 1, characterized in that: The device further comprises a lifting lug (12), which is symmetrically arranged above the base (1), and the lifting lug (12) is fixedly connected to the base (1).

6. The auxiliary lifting device for power station gate according to claim 1, characterized in that: The device further comprises a lifting shaft hole (3), and a lifting shaft hole (3) is provided in the middle position of the middle raised part of the lifting beam (2).

7. The auxiliary lifting device for power station gate according to claim 6, characterized in that: The device also includes a shaft baffle (4), which is connected to the lower part of the lifting shaft hole (3) at the top of the lifting beam (2).

8. The auxiliary lifting device for power station gate according to claim 1, characterized in that: The hydraulic cylinder (9) is fixed below the base (1) via a fixing block (8).

9. The auxiliary lifting device for a power station gate according to claim 1, characterized in that: The device further comprises a storage rack (10), the base (1) is placed flat on the storage rack (10), and the hanging beam (2) is placed flat on the base (1).

10. A lifting method for a power station gate auxiliary lifting device, used for the power station gate auxiliary lifting device according to claim 1, characterized in that: The method comprises the following steps: Step 1: Install the gate auxiliary lifting device; Step 2: Install the gate hoisting chain (15) onto the gate auxiliary lifting device; Step 3: Lift the gate using the gate auxiliary lifting device and fix the gate on the gate slot; Step 4: Remove the gate auxiliary lifting device.

11. A lifting method for a power station gate auxiliary lifting device according to claim 10, characterized in that: The step 1 comprises: Step 1.1, install the base (1) above the gate, and check and adjust the base (1); Step 1.2, check the hydraulic pump station (11); Step 1.3, check the hydraulic cylinder (9); Step 1.4: Install the hanging beam (2) above the base (1).

12. A lifting method for a power station gate auxiliary lifting device according to claim 10, characterized in that: The step 3 comprises: Step 3.1a: Use the electric oil pump to lift the gate and fix it in the gate slot, or, Step 3.1b: Use the manual oil pump to lift the gate and fix it on the gate slot.

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