Power-off protection device of electric actuating mechanism

Abstract

The invention relates to the technical field of power-off protection devices, and particularly discloses a power-off protection device of an electric actuating mechanism, which comprises a shell, a sweeping mechanism is arranged in the shell, a feeding assembly is arranged below the sweeping mechanism, the right side of the sweeping mechanism is connected with a push-pull mechanism, the sweeping mechanism is connected with a connecting rod assembly, and the connecting rod assembly is connected with a power-off protection device. A transmission assembly is arranged below the push-pull mechanism, one end of the transmission assembly is connected with a motor, one end of the transmission assembly is connected with one end of a sliding rack, the other end of the sliding rack is connected with a feeding assembly, and the push-pull mechanism is fixedly connected with the feeding assembly through a connecting rod. And the brush assembly rolls to the right side from the left side under the action of gravity, the connecting rod assembly then moves back, and the brush assembly rolls back under the action of gravity, so that the inner dustproof net is cleaned, dust is reduced, and the heat dissipation efficiency of the fan is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power-off protection devices, and more specifically to a power-off protection device for an electric actuator. Background Art

[0002] An electric actuator is a driving device that can provide linear or rotational motion. It uses a driving energy source and works under the action of a certain control signal. The actuator uses electricity or other energy sources and converts it into a driving action through a motor or other device. The electric actuator uses electrical energy as its power and accepts the standard signal of the regulator (analog or digital). By converting this signal into a corresponding mechanical displacement (rotation angle, linear movement distance or multiple turns), it automatically changes the operating variables (regulating valves, air doors, baffle openings, etc.) to achieve the purpose of automatically adjusting the adjusted parameters (temperature, pressure, flow, liquid level, etc.).

[0003] In the Chinese patent application number CN202211052321.7, a power-off protection device for an electric actuator is disclosed, including an actuator box, the upper surface of the actuator box and the bottom surface of the motor housing are jointly fixedly inlaid with a first bearing, the bottom end of the coupling is fixedly connected to a first bevel gear, the inner ring of the second bearing is jointly fixedly connected to a turbine column, the inner side wall of the actuator box is fixedly inlaid with a third bearing, the inner ring of the third bearing is fixedly connected to a worm matched with the turbine column, the worm is meshed with the turbine column, the left end of the worm is fixedly connected to a second bevel gear matched with the first bevel gear, the first bevel gear is meshed with the second bevel gear, the top end of the turbine column is fixedly connected to a rotating seat, the bottom end of the turbine column is fixedly connected to an execution output shaft, the first bevel gear is driven to rotate by the rotation of the motor, the first bevel gear drives the second bevel gear, the second bevel gear drives the worm to rotate, the worm drives the turbine to rotate and output to close the valve, and the turbine can also be directly rotated manually to close the valve.

[0004] The above-mentioned related technical solutions have the following defects: once the electric actuator as a motor is overheated, the fan can cool down the inside of the motor in time, but cannot cut off the power to protect the electric actuator. In addition, once the electric actuator is in a dusty environment, the working pressure of the motor fan dust cover increases, and the dust on its surface increases, which will affect the air circulation and make the fan encounter greater resistance when inhaling and exhausting air. This will reduce the heat dissipation efficiency inside the motor. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a power-off protection device for an electric actuator to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: a power-off protection device of an electric actuator, comprising a shell, a cleaning mechanism is arranged inside the shell, a feeding assembly is arranged below the cleaning mechanism, a push-pull mechanism is connected to the right side of the cleaning mechanism, the cleaning mechanism is connected to the connecting rod assembly, a contact rod is arranged at the left end of the push-pull mechanism, one end of the push-pull mechanism and the contact rod touch each other, a transmission assembly is arranged below the push-pull mechanism, one end of the transmission assembly is connected to the motor, one end of the transmission assembly is connected to one end of a sliding rack, the other end of the sliding rack is connected to the feeding assembly, the push-pull mechanism and the feeding assembly are fixedly connected through a connecting rod, an outer dustproof net is fixedly connected to the side wall of the shell, an inner dustproof net is arranged at the opening of the outer dustproof net, the outer dustproof net is opposite to the opening of the inner dustproof net, a fan is arranged inside the inner dustproof net, a temperature sensing device is fixedly connected to the inside of the inner dustproof net, a rotating box is connected to the tail key of the fan, and a centrifugal sensing device is fixedly connected to the inside of the rotating box; Furthermore, the cleaning mechanism includes a base fixedly connected to the interior of the shell, a rotating block is provided above the base, the rotating block is lower on the left and higher on the right, the right bottom edge of the rotating block is hinged to a corner of the base, a guide rail is fixedly connected to the top of the rotating block, a through straight slot is provided in the middle of the guide rail, a brush assembly is rollingly connected to the straight slot of the guide rail, and the lower side of the rotating block is connected to the connecting rod assembly.

[0007] Furthermore, the feeding assembly includes a feeding gear, which is meshed with a sliding rack, a worm is connected to the center of the feeding gear, the worm is rotatably connected to a support, the worm screw is connected to a feeding body, and a track is provided at the bottom end of the plug.

[0008] Furthermore, the transmission assembly includes a transmission rod, one end of which is rotatably connected to the motor, the transmission rod is rotatably connected to a column, the column is fixedly connected to the bottom of the shell, and the other end of the transmission rod is connected to a transmission gear.

[0009] Furthermore, the connecting rod assembly includes a fixed vertical rod, one end of the fixed vertical rod is fixedly connected to the rotating block, the other end of the fixed vertical rod is hinged to one end of the oblique connecting rod, the other end of the oblique connecting rod is provided with a cross rod, the oblique connecting rod is hinged to one end of the cross rod, the middle of the cross rod is fixedly connected to the push-pull mechanism, the other end of the cross rod is symmetrically connected with the oblique connecting rod, the oblique connecting rod is connected to the fixed vertical rod, and the fixed vertical rod is fixedly connected to the rotating block.

[0010] Furthermore, the push-pull mechanism includes a sleeve, which is barrel-shaped, and a push-pull rod is sleeved inside the sleeve. The push-pull rod includes a horizontal long rod located outside the push-pull rod and a protrusion located inside the sleeve, and the size of the protrusion is larger than the opening size of the sleeve. A compression spring is sleeved inside the sleeve, and the protrusion of the sleeve is located at the top of the compression spring. A notch is opened at the left end of the sleeve, and the notch of the sleeve is in contact and connected with the notch of the electric shock rod.

[0011] Furthermore, the brush assembly includes a mounting groove, and bristles are installed inside the mounting groove.

[0012] Furthermore, the centrifugal sensing device includes a fixed plate, which is fixedly connected to a rotating box, a boss is provided on one side of the fixed plate, a guide block is provided on the boss of the fixed plate, a movable plate is provided on the fixed plate, the movable plate is L-shaped, the short side of the movable plate is slidably connected to the fixed plate, a guide groove is provided in the long side of the movable plate, a contraction spring and a displacement sensor are provided between the short side of the movable plate and the boss of the fixed plate, the guide block of the fixed plate is installed in the guide groove of the movable plate, an extrusion box is provided on the outer side of the movable plate and the fixed plate, and the extrusion box is completely fitted with the movable plate and the fixed plate.

[0013] Furthermore, the temperature sensing device includes a cylinder body, a piston rod is slidably connected to the inside of the cylinder body, a horizontal plate is provided above the piston rod, a displacement sensor is fixedly connected to the lower surface of the horizontal plate, and the displacement sensor is directly opposite to the vertical rod of the cylinder body.

[0014] Furthermore, the feeding body includes a bottom block, a threaded hole is passed through the middle of the bottom block, a feeding box is provided above the bottom block, the inside of the feeding box is higher on the side away from the sliding rack and lower on the side close to the sliding rack, a plurality of threaded holes are opened on the side of the feeding box away from the sliding rack, and a plurality of plugs are installed on the threaded holes.

[0015] Technical effects and advantages of the present invention: The present invention is provided with a temperature sensing device, which is beneficial when the internal temperature of the motor rises, the temperature sensing device sends a signal, so that the contact rod and the push-pull rod that are energized to each other are separated and power is cut off, thereby realizing power-off protection. After the temperature drops, the temperature sensing device sends a signal, and the contact rod and the push-pull rod return to their original positions and contact each other, thereby realizing power restoration.

[0016] The present invention is provided with a cleaning mechanism, which is conducive to utilizing the rightward movement of the connecting rod assembly to transform the brush assembly from a left-low and right-high position to a left-high and right-low position. Utilizing the effect of gravity, the brush assembly rolls from the left side to the right side, and the connecting rod assembly moves back. Under the action of gravity, the brush assembly rolls back, so that the inner dust net is cleaned, dust is reduced, and the heat dissipation efficiency of the fan is greatly increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall internal structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure after power failure of the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the present invention from a top view.

[0021] Figure 5 It is a cross-sectional structural schematic diagram of the present invention.

[0022] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the brush structure at a in the middle.

[0023] Figure 7 for Figure 5 Schematic diagram of the enlarged structure of the centrifugal induction device at point b in the middle.

[0024] Figure 8 It is a schematic structural diagram of the feeding body of the present invention.

[0025] Fig. 9 for Figure 5 Schematic diagram of the enlarged structure of the temperature sensing device at c in the middle.

[0026] Fig.10 It is a schematic structural diagram of the feeding body of the present invention.

[0027] The accompanying drawings are marked as follows: 1. housing; 2. outer dust screen; 3. motor; 4. feeding assembly; 401. worm; 402. track; 403. feeding body; 4031. bottom block; 4032. feeding box; 404. plug; 405. support; 406. feeding gear; 5. inner dust screen; 6. sliding rack; 7. connecting rod assembly; 701. fixed vertical rod; 702. oblique connecting rod; 703. cross rod; 8. cleaning mechanism; 801. base; 802. guide rail; 803. rotating block; 804. brush assembly; 8041. mounting groove; 8042. bristles ; 9. Transmission assembly; 901. Transmission rod; 902. Column; 903. Transmission gear; 10. Push-pull mechanism; 1001. Sleeve; 1002. Push-pull rod; 1003. Compression spring; 11. Connecting rod; 12. Electric shock rod; 13. Fan; 14. Centrifugal sensing device; 1401. Extrusion box; 1402. Fixed plate; 1403. Moving plate; 1404. Contraction spring; 15. Displacement sensor; 16. Temperature sensing device; 1601. Cylinder body; 1602. Piston rod; 1603. Cross plate; 17. Rotating box; 18. Displacement sensor. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The power-off protection device of an electric actuator involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0029] Reference Figure 1 and Figure 2 The present invention provides a power-off protection device for an electric actuator, comprising a shell 1, a cleaning mechanism 8 is arranged inside the shell 1, a feeding assembly 4 is arranged below the cleaning mechanism 8, a push-pull mechanism 10 is connected to the right side of the cleaning mechanism 8, a contact rod 12 is arranged at the left end of the push-pull mechanism 10, one end of the push-pull mechanism 10 and the contact rod 12 touch each other, a transmission assembly 9 is arranged below the push-pull mechanism 10, one end of the transmission assembly 9 is connected to one end of a sliding rack 6, the other end of the sliding rack 6 is connected to the feeding assembly 4, the push-pull mechanism 10 and the feeding assembly 4 are fixedly connected by a connecting rod 11, an outer dustproof net 2 is fixedly connected to the side wall of the shell 1, an inner dustproof net 5 is arranged at the opening of the outer dustproof net 2, the outer dustproof net 2 is opposite to the opening of the inner dustproof net 5, a fan 13 is arranged inside the inner dustproof net 5, the tail key of the fan 13 is connected to a rotating box 17, and a centrifugal sensing device 14 is fixedly connected to the rotating box 17.

[0030] In this embodiment, it should be specifically explained that the torque generated by the motor 3 is large enough to drive all the mechanisms to complete corresponding actions.

[0031] The main difference between this embodiment and the prior art is that in this embodiment, a temperature sensing device 16 is used to sense the temperature. When the temperature reaches a certain degree, the electric actuator is powered off, and the dust accumulated on the inner dustproof net 5 is cleaned by the flipping of the brush assembly 804 under the action of gravity during the descending and flipping process of the cleaning mechanism 8, which is specifically in the motor 3, the transmission assembly 9, the push-pull mechanism 10, the sliding rack 6, and the cleaning mechanism 8.

[0032] The above structure is the main structure of this embodiment, which solves the problem of dust accumulation on the inner dustproof net 5 that needs to be manually cleaned, and realizes power-off protection for the electric actuator. The motor 3 is an existing structure, and the specific structure and connection method of the motor 3 are not described in detail in this embodiment.

[0033] Reference Figure 3The cleaning mechanism 8 includes a base 801 fixedly connected to the inside of the housing 1, a rotating block 803 is arranged above the base 801, the rotating block 803 is low on the left and high on the right, the right bottom edge of the rotating block 803 is hinged to a corner of the base 801, a guide rail 802 is fixedly connected to the top of the rotating block 803, a straight slot is arranged in the middle of the guide rail 802, a brush assembly 804 is rollingly connected to the straight slot of the guide rail 802, the lower side of the rotating block 803 is connected to the connecting rod assembly 7, the feeding assembly 4 includes a feeding gear 406, and the feeding gear 406 is connected to the feeding gear 406. The feeding gear 406 is meshed with the sliding rack 6, and the center of the feeding gear 406 is connected to a worm 401, which is rotatably connected to a support 405, and the worm 401 is screw-connected to a feeding body 403, and a track 402 is provided at the bottom end of the plug 404. The transmission assembly 9 includes a transmission rod 901, and one end of the transmission rod 901 is rotatably connected to a motor 3, and the transmission rod 901 is rotatably connected to a column 902, and the column 902 is fixedly connected to the bottom of the housing 1, and the other end of the transmission rod 901 is connected to a transmission gear 903.

[0034] In this embodiment, it is necessary to specifically explain that: when the connecting rod assembly 7 pushes the left side of the rotating block 803 to move upward, the rotating block 803 drives the rotating block 803 to rotate around the hinge point, and the brush assembly 804 also rotates accordingly until the left is higher and the right is lower. The brush assembly 804 rollingly connected to the guide rail 802 rolls to the right to the lowest point under the action of gravity. When the connecting rod assembly 7 pushes the rotating block 803 to return to the initial position until the left is lower and the right is higher, the brush assembly 804 rolls to the left to the lowest point under the action of gravity, so that the brush assembly 804 begins to contact with the inner dustproof net 5, and the brush assembly 804 is The inner dust-proof net 5 performs a cleaning action. When the sliding rack 6 moves to the right, it drives the feed gear 406 to rotate. The feed gear 406 drives the worm 401 to rotate, and the feed body 403 moves toward the sliding rack 6. When the sliding rack 6 moves to the left, it drives the feed gear 406 to rotate in the opposite direction. The feed gear 406 drives the worm 401 to rotate in the opposite direction, and the feed body 403 moves away from the sliding rack 6. When the brush assembly 804 performs a cleaning action on the inner dust-proof net 5, the feed body 403 is located directly below the brush assembly 804, and the feed body 403 continues to move in the direction away from the sliding rack 6.

[0035] Reference Figure 4 The connecting rod assembly 7 includes a fixed vertical rod 701, one end of the fixed vertical rod 701 is fixedly connected to the rotating block 803, the other end of the fixed vertical rod 701 is hinged to one end of the oblique connecting rod 702, the other end of the oblique connecting rod 702 is provided with a cross rod 703, the oblique connecting rod 702 is hinged to one end of the cross rod 703, the middle of the cross rod 703 is fixedly connected to the push-pull mechanism 10, the other end of the cross rod 703 is symmetrically connected with the oblique connecting rod 702, the oblique connecting rod 702 is connected to the fixed vertical rod 701, and the fixed vertical rod 701 is fixedly connected to the rotating block 803.

[0036] In this embodiment, it is necessary to specifically explain that: when the push-pull mechanism 10 moves to the right, the cross bar 703 moves to the right, and the cross bar 703 drives the upper end of the oblique link 702 to move to the right. Since the fixed vertical rod 701 is fixedly connected to the rotating block 803, the lower end of the oblique link 702 can only move vertically upward, driving the rotating block 803 to flip around the hinge point. When the push-pull mechanism 10 moves to the left, it drives the cross bar 703 to move to the left, the upper end of the oblique link 702 moves to the left, and the lower end of the oblique link 702 moves vertically downward, driving the rotating block 803 to flip around the hinge point.

[0037] Reference Figure 5 The push-pull mechanism 10 includes a sleeve 1001, which is barrel-shaped. A push-pull rod 1002 is sleeved inside the sleeve 1001. The push-pull rod 1002 includes a horizontal long rod located outside the push-pull rod 1002 and a protrusion located inside the sleeve 1001. The size of the protrusion is larger than the opening size of the sleeve 1001 to prevent the push-pull rod 1002 from leaking out of the sleeve 1001. A compression spring 1003 is sleeved inside the sleeve 1001. The protrusion of the sleeve 1001 is located at the top of the compression spring 1003. A notch is opened at the left end of the sleeve 1001, and the notch of the sleeve 1001 and the notch of the electric shock rod 12 squeeze each other.

[0038] In this embodiment, it is necessary to specifically explain that: the connecting rod 11 pulls the push-pull rod 1002 to move toward the inside of the sleeve 1001, the push-pull rod 1002 is separated from the electric shock rod 12, the electric actuator is powered off, and the protrusion of the push-pull rod 1002 squeezes the compression spring 1003. When the connecting rod 11 pulls the push-pull rod 1002 to move outside the sleeve 1001, the push-pull rod 1002 gradually approaches the electric shock rod 12, and finally the protrusion of the push-pull rod 1002 contacts the inner wall of the sleeve 1001. At the same time, the notch of the push-pull rod 1002 coincides with the notch of the electric shock rod 12, and the electric actuator resumes power supply. Reference Figure 6 The brush assembly 804 includes a mounting groove 8041, and bristles 8042 are installed inside the mounting groove 8041.

[0039] In this embodiment, it should be specifically explained that: the rotation of the brush assembly 804 drives the bristles 8042 to rotate, and after the bristles 8042 fixedly connected to the brush assembly 804 come into contact with the inner dustproof net 5, the bristles 8042 produce a cleaning action on the inner dustproof net 5.

[0040] Reference Figure 7 and Figure 8The centrifugal sensing device 14 includes a fixed plate 1402, which is fixedly connected to the rotating box 17, a boss is provided on one side of the fixed plate 1402, a guide block is provided on the boss of the fixed plate 1402, a movable plate 1403 is provided on the fixed plate 1402, and the movable plate 1403 is L-shaped. The short side of the movable plate 1403 is slidably connected to the fixed plate 1402, and a guide groove is provided in the long side of the movable plate 1403. A contraction spring 1404 and a displacement sensor 15 are provided between the short side of the movable plate 1403 and the boss of the fixed plate 1402, and the guide block of the fixed plate 1402 is installed in the guide groove of the movable plate 1403. An extrusion box 1401 is provided on the outer side of the movable plate 1403 and the fixed plate 1402, and the extrusion box 1401, the movable plate 1403 and the fixed plate 1402 are completely fitted.

[0041] In this embodiment, it is necessary to specifically explain that: when the rotation of the fan 13 becomes faster and faster, the rotation of the rotating box 17 is driven to be faster and faster, and the centrifugal sensing device 14 fixedly connected to the rotating box 17 is rotated faster and faster, and the centrifugal force generated is also larger and larger. Under the action of the increasing centrifugal force, the movable plate 1403 gradually compresses the contraction spring 1404, and the short plate of the movable plate 1403 is getting closer and closer to the displacement sensor 15. When the distance between the short plate of the movable plate 1403 and the displacement sensor 15 is reduced to a certain point of the set point distance, the displacement sensor 15 sends a signal to the motor 3, and the motor 3 starts to work. The rotation of the fan 13 becomes slower and slower, the rotation of the rotating box 17 becomes slower and slower, and the centrifugal sensing device 14 fixedly connected to the rotating box 17 is rotated slower and slower, and the centrifugal force generated is also smaller and smaller. The short plate of the movable plate 1403 is farther and farther from the displacement sensor 15. When the distance between the short plate of the movable plate 1403 and the displacement sensor 15 increases to a certain point exceeding the set point distance, the displacement sensor 15 sends a signal to the motor 3, and the motor 3 starts to rotate in the reverse direction.

[0042] Reference Fig. 9 The temperature sensing device 16 includes a cylinder body 1601, a piston rod 1602 is slidably connected inside the cylinder body 1601, a horizontal plate 1603 is provided above the piston rod 1602, and a displacement sensor 18 is fixedly connected to the lower surface of the horizontal plate 1603, and the displacement sensor 18 is opposite to the vertical rod of the cylinder body 1601.

[0043] In this embodiment, it is necessary to specifically explain that: when the internal temperature of the electric actuator begins to rise, a heat-expandable liquid is installed under the piston rod 1602, and air is installed at the rod head of the piston rod 1602, and the heat expansion rate of the heat-expandable liquid is significantly greater than that of the air. In this way, the volume of the liquid under the piston rod 1602 that expands when heated is greater than the volume of the air that expands when heated, and the piston rod 1602 is squeezed to move upward, and the rod head of the piston rod 1602 is getting closer and closer to the displacement sensor 18. When the temperature gradually drops, the volume of the liquid under the piston rod 1602 that decreases when heated is greater than the volume of the air that expands when heated, and the piston rod 1602 moves downward, and the rod head of the piston rod 1602 is getting farther and farther away from the displacement sensor 18.

[0044] Reference Fig.10 The feeding body 403 includes a bottom block 4031, a threaded hole passes through the middle of the bottom block 4031, a feeding box 4032 is arranged above the bottom block 4031, the inside of the feeding box 4032 is higher on the side away from the sliding rack 6, and lower on the side close to the sliding rack 6, and a plurality of threaded holes are opened on the side away from the sliding rack 6, and a plurality of plugs 404 are installed on the threaded holes.

[0045] In this embodiment, it is necessary to specifically explain that: when dust enters the interior of the feed box 4032 and gradually accumulates, it will fall to the lower side of the interior of the feed box 4032 under the action of gravity. When the operator takes out the feed body 403 to dump the dust, if the weight of the feed body 403 is too heavy, the dust can be poured out from the hole of the feed box 4032 by unscrewing the plug 404, without having to completely turn the feed body 403 over to pour out the dust.

[0046] The main problem solved by this embodiment is: using the temperature sensing device 16 to sense the temperature, when the temperature reaches the threshold, the electric actuator is powered off to protect the electric actuator, and the dust accumulated on the inner dustproof net 5 is cleaned by the flipping of the brush assembly 804 under the action of gravity during the descending and flipping process of the cleaning mechanism 8, thereby solving the problem of manual cleaning of the dust accumulated on the inner dustproof net 5.

[0047] The specific steps are as follows: First, when the temperature of the electric actuator as a motor is getting higher and higher, the temperature diffuses into the electric actuator protection device, and the internal temperature begins to rise. Inside the temperature sensing device 16, a liquid that is easily expanded when heated is installed under the piston rod 1602, and air is installed at the rod head of the piston rod 1602. The thermal expansion rate of the liquid that is easily expanded when heated is significantly greater than that of the air. In this way, the volume of the liquid under the piston rod 1602 that is expanded when heated is greater than that of the air. The piston rod 1602 is squeezed to move upward, and the rod head of the piston rod 1602 is getting closer and closer to the displacement sensor 18. The receiving signal of the displacement sensor 18 changes, and the position sensor 18 changes. The displacement sensor 18 sends the signal change to the fan 13. The fan 13 receives the signal, so the rotation of the fan 13 becomes faster and faster, driving the rotating box 17 to rotate faster and faster. The centrifugal sensing device 14 fixedly connected to the rotating box 17 also rotates faster and faster, and the centrifugal force generated becomes larger and larger. Under the action of the increasingly larger centrifugal force, the moving plate 1403 gradually compresses the contraction spring 1404, and the short plate of the moving plate 1403 is getting closer and closer to the displacement sensor 15. When the distance between the short plate of the moving plate 1403 and the displacement sensor 15 is reduced to a certain point of the set point distance, the displacement sensor 15 sends a signal to the motor 3, and the motor 3 starts to work; When the motor 3 starts to work, it drives the transmission rod 901 to start rotating, and the transmission rod 901 drives the transmission gear 903 to rotate. The rotation of the transmission gear 903 causes the sliding rack 6 to move to the right, and the sliding rack 6 drives the connecting rod 11 to move to the right, and the connecting rod 11 drives the push-pull rod 1002 to move to the right. In this way, the push-pull rod 1002 and the electric contact rod 12 begin to be out of contact, and the electric actuator is powered off. At the same time, the rotation of the transmission rod 901 and the movement of the push-pull rod 1002 occur almost simultaneously. The rotation output of the transmission rod 901 causes the valve of the electric actuator to be closed, and the electric actuator is protected from power failure. When the push-pull rod 1002 moves to the right, it drives the cross bar 703 to move to the right, and the cross bar 703 drives the upper end of the oblique connecting rod 702 to move to the right. Since the fixed vertical rod 701 is fixedly connected to the rotating block 803, the lower end of the oblique connecting rod 702 can only move vertically upward, driving the rotating block 803 to flip around the hinge point. When it flips to the upper left and lower right, under the action of gravity, the brush assembly 804 flips to the right. When the sliding rack 6 moves to the right, it drives the feeding gear 406 to rotate, and the feeding gear 406 drives the worm 401 to rotate, and the feeding body 403 moves in the direction close to the sliding rack 6. After the electric actuator is powered off, the temperature of the electric actuator protection device gradually decreases, the volume reduction of the liquid under the piston rod 1602 due to heat expansion is greater than the volume reduction of the air due to heat expansion, the piston rod 1602 moves downward, and the rod head of the piston rod 1602 is farther and farther away from the displacement sensor 18. The displacement sensor 18 sends a displacement change information signal to the fan 13. The fan 13 receives the signal, so the rotation of the fan 13 becomes slower and slower, the rotating box 17 rotates slower and slower, and the centrifugal sensing device 14 fixedly connected to the rotating box 17 rotates slower and slower, and the centrifugal force generated becomes smaller and smaller. The short plate of the moving plate 1403 is farther and farther from the displacement sensor 15. When the distance between the short plate of the moving plate 1403 and the displacement sensor 15 increases to a point that exceeds the set point distance, the displacement sensor 15 sends a signal to the motor 3, and the motor 3 starts to rotate in the reverse direction. After the motor 3 rotates in the reverse direction for the same number of circles as the forward rotation, it stops rotating. When the motor 3 starts to rotate in the reverse direction, the transmission rod 901 and the transmission gear 903 both rotate in the reverse direction, the sliding rack 6 starts to move to the left, the sliding rack 6 drives the connecting rod 11 to move to the left, and the connecting rod 11 drives the push-pull rod 1002 to move to the left, and the push-pull rod 1002 gradually approaches the electric contact rod 12. At a certain point, the push-pull rod 1002 contacts the electric contact rod 12, and the electric actuator resumes power supply. At the same time, the rotation output of the transmission rod 901 causes the valve of the electric actuator to be gradually opened; When the push-pull rod 1002 moves to the left, it drives the cross bar 703 to move to the left, the upper end of the oblique connecting rod 702 moves to the left, and the lower end of the oblique connecting rod 702 moves vertically downward, driving the rotating block 803 to flip around the hinge point. When it flips to the lower left and upper right, under the action of gravity, the brush assembly 804 flips to the left, and the brush assembly 804 cleans the inner dust-proof net 5. When the sliding rack 6 moves to the left, it drives the feeding gear 406 to rotate in the opposite direction. The feeding gear 406 drives the worm 401 to rotate in the opposite direction, and the feeding body 403 moves in the direction away from the sliding rack 6. When the brush assembly 804 cleans the inner dust-proof net 5, the feeding body 403 is just located under the brush assembly 804, and the feeding body 403 continues to move in the direction away from the sliding rack 6, and the operator comes to dump the dust accumulated in the feeding body 403 into the trash can.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power-off protection device for an electric actuator, comprising a housing (1), characterized in that: A cleaning mechanism (8) is provided inside the housing (1), a feeding assembly (4) is provided below the cleaning mechanism (8), a push-pull mechanism (10) is connected to the right side of the cleaning mechanism (8), the cleaning mechanism (8) is connected to the connecting rod assembly (7), a contact rod (12) is provided at the left end of the push-pull mechanism (10), one end of the push-pull mechanism (10) and the contact rod (12) are in contact with each other, a transmission assembly (9) is provided below the push-pull mechanism (10), one end of the transmission assembly (9) is connected to the motor (3), one end of the transmission assembly (9) is connected to one end of the sliding rack (6), and the sliding rack (6) is The other end is connected to the feeding assembly (4); the push-pull mechanism (10) is fixedly connected to the feeding assembly (4) via a connecting rod (11); an outer dustproof net (2) is fixedly connected to the side wall of the housing (1); an inner dustproof net (5) is provided at the opening of the outer dustproof net (2); the openings of the outer dustproof net (2) and the inner dustproof net (5) are opposite; a fan (13) is provided inside the inner dustproof net (5); a temperature sensing device (16) is fixedly connected inside the inner dustproof net (5); a rotating box (17) is connected to the tail key of the fan (13); a centrifugal sensing device (14) is fixedly connected inside the rotating box (17); The temperature sensing device (16) comprises a cylinder body (1601), the interior of the cylinder body (1601) being slidably connected to a piston rod (1602), a horizontal plate (1603) being provided above the piston rod (1602), a displacement sensor (18) being fixedly connected to the lower surface of the horizontal plate (1603), and the displacement sensor (18) being directly opposite to the vertical rod of the cylinder body (1601).

2. The power-off protection device for an electric actuator according to claim 1, characterized in that: The cleaning mechanism (8) comprises a base (801) fixedly connected to the inside of the housing (1); a rotating block (803) is provided above the base (801); the rotating block (803) is lower on the left and higher on the right; the right bottom edge of the rotating block (803) is hinged to a corner of the base (801); a guide rail (802) is fixedly connected to the top of the rotating block (803); a straight slot is provided in the middle of the guide rail (802); a brush assembly (804) is rollingly connected to the straight slot of the guide rail (802); and the lower side of the rotating block (803) is connected to the connecting rod assembly (7).

3. The power-off protection device for an electric actuator according to claim 1, characterized in that: The feeding assembly (4) comprises a feeding gear (406), the feeding gear (406) being meshedly connected with a sliding rack (6), a worm (401) being connected at the center of the feeding gear (406), the worm (401) being rotatably connected with a support (405), the screw of the worm (401) being connected with a feeding body (403), and a track (402) being provided at the bottom end of the feeding body (403).

4. The power-off protection device for an electric actuator according to claim 1, characterized in that: The transmission assembly (9) comprises a transmission rod (901), one end of the transmission rod (901) being rotatably connected to the motor (3), the transmission rod (901) being rotatably connected to a column (902), the column (902) being fixedly connected to the bottom of the housing (1), and the other end of the transmission rod (901) being connected to a transmission gear (903).

5. The power-off protection device for an electric actuator according to claim 1, characterized in that: The connecting rod assembly (7) comprises a fixed vertical rod (701), one end of which is fixedly connected to a rotating block (803), the other end of which is hinged to one end of an oblique connecting rod (702), the other end of which is provided with a cross rod (703), the oblique connecting rod (702) is hinged to one end of the cross rod (703), the middle of which is fixedly connected to a push-pull mechanism (10), the other end of which is symmetrically connected to an oblique connecting rod (702), the oblique connecting rod (702) is connected to the fixed vertical rod (701), and the fixed vertical rod (701) is fixedly connected to the rotating block (803).

6. The power-off protection device for an electric actuator according to claim 1, characterized in that: The push-pull mechanism (10) comprises a sleeve (1001), the sleeve (1001) is barrel-shaped, a push-pull rod (1002) is sleeved inside the sleeve (1001), the push-pull rod (1002) comprises a horizontal long rod located outside the push-pull rod (1002) and a protrusion located inside the sleeve (1001), the size of the protrusion is larger than the opening size of the sleeve (1001), a compression spring (1003) is sleeved inside the sleeve (1001), the protrusion of the sleeve (1001) is located at the top of the compression spring (1003), a notch is opened at the left end of the sleeve (1001), and the notch of the sleeve (1001) is in contact and connected with the notch of the electric shock rod (12).

7. The power-off protection device for an electric actuator according to claim 2, characterized in that: The brush assembly (804) comprises a mounting groove (8041), and bristles (8042) are mounted inside the mounting groove (8041).

8. The power-off protection device for an electric actuator according to claim 1, characterized in that: The centrifugal induction device (14) comprises a fixed plate (1402), the fixed plate (1402) being fixedly connected to a rotating box (17), a boss being provided on one side of the fixed plate (1402), a guide block being provided on the boss of the fixed plate (1402), a moving plate (1403) being provided on the fixed plate (1402), the moving plate (1403) being L-shaped, the short side of the moving plate (1403) being slidably connected to the fixed plate (1402), and the moving plate (1403) being A guide groove is provided in the long side, a contraction spring (1404) and a displacement sensor (15) are provided between the short side of the movable plate (1403) and the boss of the fixed plate (1402), the guide block of the fixed plate (1402) is installed in the guide groove of the movable plate (1403), an extrusion box (1401) is provided on the outer sides of the movable plate (1403) and the fixed plate (1402), and the extrusion box (1401) is completely fitted with the movable plate (1403) and the fixed plate (1402).

9. The power-off protection device for an electric actuator according to claim 3, characterized in that: The feeding body (403) comprises a bottom block (4031), a threaded hole is formed in the middle of the bottom block (4031), a feeding box (4032) is provided above the bottom block (4031), the inside of the feeding box (4032) is higher on the side away from the sliding rack (6) and lower on the side close to the sliding rack (6), a plurality of threaded holes are formed on the side of the feeding box (4032) away from the sliding rack (6), and a plurality of plugs (404) are installed on the threaded holes.

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