A disassembly and assembly device and method for an electric actuator mechanical braking mechanism

Abstract

This invention belongs to the field of mechanical assembly, specifically relating to a disassembly and assembly device and method for a mechanical braking mechanism of an electric actuator. The device includes an operating handle a, a threaded rod, a fixed bracket, a pressure cap, an operating handle b, a fixing pin, a locking latch a, a locking latch b, a flathead screwdriver, a connecting piece a, and a connecting piece b. The upper end of the threaded rod is connected to the operating handle a, the lower end of the threaded rod is connected to the pressure cap, and the middle part of the threaded rod is connected to the fixed bracket. The flathead screwdriver, connecting piece a, and connecting piece b form a flathead screwdriver assembly, which is inserted into one side of the fixed bracket. The other end of the flathead screwdriver assembly is connected and fixed to the operating handle b. This invention solves the problem of easy damage to springs, set screws, and metal washers during the disassembly and assembly of mechanical braking mechanisms, ensuring the assembly quality of the mechanical braking mechanism and avoiding industrial safety risks during disassembly and assembly.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly, and specifically relates to a disassembly and assembly device and method for an electric actuator mechanical braking mechanism. Background Technology

[0002] A nuclear power plant's Phase I project installed over 170 electric actuators for regulating valves across two units. This type of actuator features a mechanical braking mechanism directly mounted on the motor's output shaft. The output gear of the braking mechanism is reduced in speed by a single-stage spur gear and then transmitted to the valve body via a worm gear, thus enabling the valve's opening and closing function. The worm gear pair in this actuator provides a self-locking function. The mechanical braking mechanism is located between the motor rotor shaft and the mechanical braking mechanism, eliminating the need for a clutch. This means that when the actuator is operating normally, the frictional force of the brake pads acts as the load.

[0003] The main working principle of this type of mechanical braking mechanism is that the output gear of the motor is designed as a gear sleeve. The torque of the motor rotor shaft is transmitted to the gear sleeve through a common flat key. Two metal washers, an upper metal washer and a lower metal washer, are designed on the output gear sleeve. A compressed spring is placed between the two metal washers. The spring force provides pressure between the lower metal washer and the bakelite sheet. When the motor is de-energized, the sliding friction between the lower metal washer and the bakelite sheet provides the braking effect. To ensure that the spring is always in a compressed state, a set screw is installed in the gear sleeve. This set screw acts as a limit screw, and the entire device is fixed to the motor rotor shaft through one end of the flat key.

[0004] The main function of this mechanical braking mechanism is to control the adjustment accuracy of the electric regulating valve. If the braking mechanism is loose, worn or damaged, it will cause the electric regulating valve to over-adjust or lag during the adjustment process, affecting the adjustment accuracy of the equipment. Therefore, the quality of disassembly and assembly of this mechanical braking mechanism is particularly important.

[0005] Previously, when disassembling and assembling this mechanical brake mechanism according to the maintenance manual, the set screws would strip and fall off, and the springs and metal washers would be deformed to varying degrees. This affected the installation quality of the mechanical brake, and consequently, the maintenance quality of the electric actuator. Disassembly and assembly of the mechanical brake mechanism on-site typically required 2-3 people working together. Because the set screws of the fixing and positioning transmission gears were within the spring's operating range, each disassembly and assembly required pressing down on the upper metal washer and compressing the spring, then using a screwdriver to pry open the compressed spring to expose the set screw installation position, and finally removing the set screw with a screwdriver. During this process, the existing spring force could hinder the unscrewing of the set screw and damage the spring, while also posing a risk of mechanical injury. The entire process was time-consuming, labor-intensive, inefficient, and highly prone to causing equipment damage and personnel injury. Reassembling the mechanical brake mechanism was the reverse of the disassembly process, but the same difficulties and risks existed.

[0006] Therefore, there is a need to provide a disassembly and assembly device and method for the mechanical braking mechanism of an electric actuator to solve the problems existing in the prior art. Summary of the Invention

[0007] The purpose of this invention is to provide a disassembly and assembly device and method for an electric actuator's mechanical braking mechanism, which solves the problem that springs, set screws and metal washers are easily damaged during the disassembly and assembly of the mechanical braking mechanism, ensures the assembly quality of the mechanical braking mechanism, and avoids industrial safety risks caused during the disassembly and assembly process.

[0008] Technical solution to achieve the purpose of this invention:

[0009] A disassembly and assembly device for the mechanical braking mechanism of an electric actuator, the device comprising an operating handle a, a threaded rod, a fixed bracket, a pressure cap, an operating handle b, a fixing pin, a latch a, a latch b, a flathead screwdriver, a connecting piece a, and a connecting piece b;

[0010] The upper end of the threaded rod is connected to the operating handle a, the lower end of the threaded rod is connected to the pressure cap, and the middle part of the threaded rod is connected to the fixed bracket; the flathead screwdriver, connector a, and connector b form a flathead screwdriver assembly, which is inserted into one side of the fixed bracket, and the other end of the flathead screwdriver assembly is connected and fixed to the operating handle b; the fixing pin is connected to one side of the fixed bracket, and the locking buckle a is connected to the fixing pin. When in use, the locking buckle a is used to lock the operating handle b; the locking buckle b is installed on the connector a to lock the flathead screwdriver and prevent the flathead screwdriver from deflecting during use.

[0011] The flathead screwdriver assembly is inserted into one side of the fixed bracket and fixed by the side end cap and fastening screw c.

[0012] The other end of the flathead screwdriver assembly is connected and fixed to the operating handle b by a fastening screw a.

[0013] The operating handle a is fixed above the threaded rod by a fastening screw a.

[0014] The threaded rod is connected to the gland via a thread.

[0015] The flathead screwdriver is connected to connector a via a rotating pin, and connector b is also connected to connector a via a thread. The flathead screwdriver, connector a, and connector b together form a flathead screwdriver assembly.

[0016] The feature is that the fixing pin is welded to one side of the fixing bracket, and the latch a is connected to the fixing pin through the transmission pin 17.

[0017] The fixed bracket has positioning holes on both sides, and the fixed bracket is fixed to the motor and mechanical braking mechanism through the positioning holes.

[0018] The position of the flathead screwdriver assembly of the disassembly and assembly device is determined according to the height of the set screw hole of the mechanical braking mechanism on the motor.

[0019] A method for disassembling and assembling a disassembly and assembly device for an electric actuator mechanical braking mechanism, the method comprising the following steps:

[0020] Step 1: Fix the mounting bracket to the motor and mechanical brake mechanism through the positioning holes. Rotate the operating handle a to make the pressure cover contact the gear on the mechanical brake mechanism. Straighten the flathead screwdriver so that it is on the same horizontal line as connector a and connector b. Use the lock b to fix it and insert the flathead screwdriver into the spring.

[0021] Step 2: Swing the operating handle b perpendicular to the fixed bracket to confirm that the springs have been pried open and the set screw is exposed. Use the lock a to lock the operating handle b. Unscrew the set screw, restore the lock b, and retract the flathead screwdriver. Unscrew the operating handle a to disassemble the mechanical braking mechanism one by one. After completing the disassembly and inspection of the mechanical braking mechanism, reassemble each component.

[0022] Step 3: Fix the mounting bracket of the device to the motor and mechanical brake mechanism through the positioning holes and secure it with bolts; install the components of the mechanical brake mechanism, and rotate the operating handle a to make the pressure cover contact the gear on the mechanical brake mechanism; straighten the flathead screwdriver so that it is on the same horizontal line as the connecting piece a and the connecting piece b, use the lock b to fix it, and insert the flathead screwdriver into the spring;

[0023] Step 4: Swing the operating handle b perpendicular to the fixed bracket to confirm that the springs have been pried open and the set screw is exposed. Use the lock a to lock the operating handle b. Screw the set screw in, restore the lock b, and retract the flathead screwdriver. Slowly squeeze the gear and spring through the operating handle a. After confirming that the installation is in place, unscrew the pressure cap. Loosen the fixing bolts and remove the disassembly device from the motor and mechanical braking mechanism.

[0024] The beneficial technical effects of this invention are as follows:

[0025] 1) This invention prevents the risk of injury caused by the gears and springs of the mechanical braking mechanism being squeezed by the operating handle;

[0026] 2) Based on the structural characteristics of the mechanical braking mechanism, the present invention ensures that the fixed bracket fits tightly with the outer edge of the motor at the mechanical braking mechanism, eliminating the need for external tools for fixing;

[0027] 3) Based on the structural characteristics of the mechanical braking mechanism, the handle transmission cover can compress the gears and springs of the mechanical braking mechanism without the need for manual pressing. By using this device, single-person operation can be achieved without the need for assistance, saving manpower and time. The disassembly and assembly device has a simple, compact, small, and stable structure and is easy to carry. Attached Figure Description

[0028] Figure 1 A schematic diagram of a disassembly and assembly device for an electric actuator mechanical braking mechanism provided by the present invention;

[0029] In the diagram: 1-Operating handle a; 2-Threaded rod; 3-Fixed bracket; 4-Pressure cap; 5-Positioning hole; 6-Operating handle b; 7-Fixing pin; 8-Side end cap; 9-Lock a; 10-Lock b; 11-Slotted screwdriver; 12-Connector a; 13-Connector b; 14-Fastening screw a; 15-Fastening screw b; 16-Fastening screw c; 17-Drive pin. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in the present invention without creative effort are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, the present invention provides an electric actuator mechanical braking mechanism disassembly and assembly device, which includes an operating handle a1, a threaded rod 2, a fixed bracket 3, a pressure cover 4, an operating handle b6, a fixing pin 7, a latch a9, a latch b10, a side end cover 8, a flathead screwdriver 11, a connector a12, a connector b13, a fastening screw a14, a fastening screw b15, a fastening screw c16, and a transmission pin 17.

[0032] The upper end of the threaded rod 2 is connected to the operating handle a1, the lower end of the threaded rod 2 is connected to the pressure cap 4, and the middle part of the threaded rod 2 is connected to the fixed bracket 3 by threads. The flathead screwdriver 11, the connector a12, and the connector b13 form a flathead screwdriver assembly, which is inserted into one side of the fixed bracket 3 and fixed by the side end cap 8 and the fastening screw c16. The other end of the flathead screwdriver assembly is connected to the operating handle b6 by the fastening screw a15. The fixing pin 7 is connected to one side of the fixed bracket 3, and the locking buckle a9 is connected to the fixing pin 7. When in use, the locking buckle a9 is used to lock the operating handle b6. The locking buckle b10 is installed on the connector a12 to lock the flathead screwdriver 11 and prevent the flathead screwdriver 11 from deflecting during use.

[0033] The operating handle a1 is fixed above the threaded rod 2 by fastening screw a14;

[0034] The threaded rod 2 is connected to the pressure cap 4 via a thread;

[0035] The flathead screwdriver 11 is connected to the connector a12 via a rotating pin, and the connector b13 is also connected to the connector a12 via a thread. The flathead screwdriver 11, connector a12, and connector b13 together form a flathead screwdriver assembly.

[0036] The flathead screwdriver assembly is inserted into one side of the fixed bracket 3 and secured by the side end cap 8 and the fastening screw c16.

[0037] The other end of the flathead screwdriver assembly is connected to the operating handle b6 via a fastening screw b15.

[0038] The fixing pin 7 is welded to one side of the fixing bracket 3, and the locking buckle a9 is connected to the fixing pin 7 through the transmission pin 17.

[0039] The fixed bracket 3 has positioning holes 5 on both sides, and the fixed bracket 3 is fixed to the motor and mechanical braking mechanism through the positioning holes 5.

[0040] The position of the flathead screwdriver assembly in this disassembly and assembly device is determined by the height of the set screw hole of the mechanical braking mechanism on the motor.

[0041] The present invention also provides a method for disassembling and assembling a disassembly and assembly device for an electric actuator mechanical braking mechanism, the method comprising the following steps:

[0042] Step 1: Fix the fixed bracket 3 to the motor and mechanical brake mechanism through the positioning hole 5. Rotate the operating handle a1 to make the pressure cover 4 contact the gear on the mechanical brake mechanism. Straighten the flathead screwdriver 11 so that it is on the same horizontal line as the connector a12 and connector b13. Use the lock b10 to fix it and insert the flathead screwdriver 11 into the spring.

[0043] Step 2: Swing the operating handle b6 perpendicular to the fixed bracket 3 to confirm that the springs have been pried open and the set screw is exposed. Use the locking clip a9 to lock the operating handle b6. Use a regular flathead screwdriver to unscrew the set screw, restore the locking clip b10, and retract the flathead screwdriver 11. Unscrew the operating handle a1 to disassemble the mechanical braking mechanism one by one. After completing the disassembly and inspection of the mechanical braking mechanism, reassemble each component in the order of disassembly.

[0044] Step 3: Fix the fixed bracket 3 of the device to the motor and mechanical brake mechanism through the positioning hole 5 and fix it with bolts; install the components of the mechanical brake mechanism, and make the pressure cover 4 contact the gear on the mechanical brake mechanism by rotating the operating handle a1; straighten the flathead screwdriver 11 so that it is on the same horizontal line as the connector a12 and connector b13, fix it with the lock b10, and insert the flathead screwdriver 11 into the spring;

[0045] Step 4: Swing the operating handle b6 perpendicular to the fixed bracket 3 to confirm that the springs have been pried open and the set screw is exposed. Use the locking clip a9 to lock the operating handle b6. Use a regular flathead screwdriver to screw in the set screw, restore the locking clip b10, and retract the flathead screwdriver 11. Slowly squeeze the gear and spring through the operating handle a1. After confirming that the installation is in place, unscrew the pressure cover 4. Loosen the fixing bolts and remove the disassembly and assembly device from the motor and mechanical braking mechanism.

[0046] 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, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A disassembly and assembly device for a mechanical braking mechanism of an electric actuator, characterized in that: The device comprises an operating handle a (1), a threaded rod (2), a fixed support (3), a gland (4), an operating handle b (6), a fixed pin (7), a lock a (9), a lock b (10), a flat-blade screwdriver (11), a connecting piece a (12) and a connecting piece b (13); The upper end of the threaded rod (2) is connected with the operating handle a (1), the lower end of the threaded rod (2) is connected with the gland (4), and the middle part of the threaded rod (2) is connected with the fixed support (3); the flat-blade screwdriver (11), the connecting piece a (12) and the connecting piece b (13) form a flat-blade screwdriver assembly, which is inserted into one side of the fixed support (3), and the other end of the flat-blade screwdriver assembly is connected with the operating handle b (6); the fixed pin (7) is connected with one side of the fixed support (3), the lock a (9) is connected with the fixed pin (7), and the lock a (9) is used to lock the operating handle b (6) during use; the lock b (10) is installed on the connecting piece a (12) and is used to lock the flat-blade screwdriver (11) to prevent the flat-blade screwdriver (11) from being deflected during use.

2. The device according to claim 1, characterized in that: The flat-blade screwdriver assembly is inserted into one side of the fixed support (3) and is fixed by the side end cover (8) and the fastening screw c (16).

3. The device according to claim 2, characterized in that it comprises: The other end of the flat-blade screwdriver assembly is connected with the operating handle b (6) by the fastening screw b (15).

4. The device according to claim 3, characterized in that: The operating handle a (1) is fixed above the threaded rod (2) by the fastening screw a (14).

5. A device for dismounting and mounting a mechanical brake mechanism of an electric actuator according to claim 4, characterized in that: The lower part of the threaded rod (2) is connected with the gland (4) by threads.

6. A device for disassembling and assembling the mechanical brake mechanism of an electric actuator according to claim 5, characterized in that: The flat-blade screwdriver (11) is connected with the connecting piece a (12) by a rotating pin, the connecting piece b (13) is also connected with the connecting piece a (12) by threads, and the flat-blade screwdriver (11), the connecting piece a (12) and the connecting piece b (13) form a flat-blade screwdriver assembly.

7. A device for disassembling and assembling the mechanical brake mechanism of an electric actuator according to claim 6, characterized in that: The fixed pin (7) is welded on one side of the fixed support (3), and the lock a (9) is connected with the fixed pin (7) by a transmission pin (17).

8. A device for disassembling and assembling the mechanical brake mechanism of an electric actuator according to claim 7, characterized in that: Both sides of the fixed support (3) are provided with positioning holes (5), and the fixed support (3) is fixed on the motor and the mechanical brake mechanism through the positioning holes (5).

9. A device for dismounting a mechanical brake mechanism of an electric actuator according to claim 8, characterized in that: The position of the flat-blade screwdriver assembly of the dismounting device is determined according to the height of the jack hole of the mechanical brake mechanism on the motor.

10. The method of claim 9, wherein: The method comprises the following steps: Step one: fix the fixed support (3) on the motor and the mechanical brake mechanism through the positioning holes (5), make the gland (4) contact the gear on the mechanical brake mechanism by rotating the operating handle a (1); straighten the flat-blade screwdriver (11), make the flat-blade screwdriver (11), the connecting piece a (12) and the connecting piece b (13) be on a horizontal line, fix them by using the lock b (10), and insert the flat-blade screwdriver (11) into the spring; Step two: swing the operating handle b (6) to be perpendicular to the fixed support (3), confirm that the spring has been pried open, the jack position is exposed, lock the operating handle b (6) by using the lock a (9); rotate the jack out, restore the lock b (10), and retract the flat-blade screwdriver (11); dismount the mechanical brake mechanism one by one by rotating the operating handle a (1); after completing the disassembly and inspection of the mechanical brake mechanism, reinstall each part; Step three: the fixed support (3) of the device is fixed on the motor and mechanical brake mechanism through the positioning hole (5), and is fixed by a bolt; the components of the mechanical brake mechanism are installed, the gland (4) is contacted with the gear on the mechanical brake mechanism by rotating the operating handle a (1); the flat-blade screwdriver (11) is straightened to be in a horizontal line with the connecting piece a (12) and the connecting piece b (13), is fixed by using the lock catch b (10), and is inserted into the spring; Step four: the operating handle b (6) is swung to be perpendicular to the fixed support (3), it is confirmed that the springs have been pried open, the position of the jack screw is exposed, the operating handle b (6) is locked by using the lock catch a (9); the jack screw is screwed in, the lock catch b (10) is restored, and the flat-blade screwdriver (11) is retracted; the gear and the spring are slowly extruded by operating the handle a (1), and the gland (4) is rotated off after it is confirmed that the installation is in place; the fixing bolt is loosened, and the dismounting device is taken off from the motor and the mechanical brake mechanism.

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