Electric actuator

Abstract

The present invention relates to a power output device, and in particular to an electric actuator. The technical solution is: an electric actuator, including a housing, a motor arranged in the housing, a main circuit board, a gear set and an output shaft, the housing is provided with a fault location mechanism at the installation position of the output shaft, the housing is provided with an instrument mechanism for displaying the status, the instrument mechanism is provided with an indicating shaft linked with the output shaft, the instrument mechanism includes an instrument box exposed outside the housing and arranged in a polygonal shape, a pointer is provided on the longitudinal top end face of the instrument box, and each lateral end face of the instrument box is a status prompt end face, an illuminating LED lamp and a circuit board that controls the LED lamp to emit light and is electrically connected to the main circuit board are provided inside the instrument box, and a light-transmitting area that can cause the light source of the LED lamp to be revealed to the outside is provided on the instrument box. The above technical solution is adopted to provide an electric actuator that is convenient for operators to observe the status during execution and is easy to assemble.

Description

Technical Field

[0001] The invention relates to a power output device, in particular to an electric actuator. Background Art

[0002] An electric actuator is a special drive tool that converts electrical energy into mechanical energy.

[0003] The traditional electric actuator is mainly composed of a housing, a motor arranged in the housing, a gear set linked to the motor, and an output shaft linked to the gear set. The output shaft is the power output end of the electric actuator, which can be directly linked to the driven object, such as a valve. The housing is provided with an instrument mechanism for displaying the status (such as the valve opening angle or the valve opening or closing status), and the instrument mechanism is provided with an indicating shaft linked to the output shaft. During use, the indicating shaft can be rotated by the rotation of the output shaft, and the rotation can drive the pointer in the instrument mechanism to move, thereby displaying the output torque of the output shaft.

[0004] At present, the instrument panel of the instrument mechanism is usually cylindrical. Since the installation position of such electric actuators is relatively diverse, the specific installation position is mainly determined by the position of the valve that provides power to it. When the electric actuator is installed at a higher position, it is difficult for the operator to see with the naked eye what the pointer in the instrument panel on its shell is indicating, which makes the instrument mechanism useless.

[0005] The indicator shaft in the instrument mechanism is linked to the output shaft. During the assembly process, the instrument mechanism is the last component to be assembled. The indicator shaft is relatively long and needs to be assembled with the output shaft along the axial direction of the housing. However, after the parts inside the housing are assembled, the installation space inside the housing is small, and the assembly tools are difficult to insert into the housing, which makes the assembly process extremely cumbersome, prolongs the assembly time, and reduces the assembly efficiency. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an electric actuator which is convenient for operators to observe the status during execution and is easy to assemble.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electric actuator, comprising a shell, a motor arranged in the shell, a main circuit board for controlling the opening and closing of the motor, a gear set linked to the motor and an output shaft linked to the gear set, the shell is provided with a fault locating mechanism at the installation position of the output shaft, the shell is provided with an instrument mechanism for displaying the status, the instrument mechanism is provided with an indicating shaft linked to the output shaft, and is characterized in that: the instrument mechanism comprises an instrument box exposed outside the shell and arranged in a polygonal shape, a pointer linked to the indicating shaft and rotating with the indicating shaft is provided on the longitudinal top end face of the instrument box, the lateral end faces of the instrument box are status prompt end faces, an luminous LED lamp and a circuit board that controls the LED lamp to emit light and is electrically connected to the main circuit board are provided inside the instrument box, and a light-transmitting area that can cause the light source of the LED lamp to be revealed to the outside is provided on the instrument box.

[0008] By adopting the above technical scheme, the instrument box is exposed outside the shell, and the instrument box is polygonal and has multiple status indication end faces in the horizontal direction. When the electric actuator is installed in a lower installation position that the operator can observe more intuitively, the operator can easily observe the indication status on the instrument box; when the electric actuator is installed in a higher position and the operator cannot intuitively observe the status indication end face of the instrument box, the LED light inside the instrument box can be used to display the indication status of the instrument, and the light-transmitting area is set to allow the internal light source of the instrument box to pass through the instrument box; the setting of the above scheme enables the operator to directly and conveniently observe the execution dynamics of the electric actuator regardless of the installation position of the electric actuator.

[0009] The present invention is further configured as follows: the indicating shaft comprises an indicating part linked to the pointer and a linkage part linked to the output shaft, and the indicating part and the linkage part are detachably connected.

[0010] Wherein, a plug-in slot is provided at the connection between the indicating part and the linkage part, and a plug-in block adapted to the plug-in slot is provided at the linkage part.

[0011] By adopting the above technical solution, during the process of assembling the output shaft, the linkage part of the indicating shaft can be assembled with the output shaft, and the indicating part of the indicating shaft can be assembled with the instrument box, and then the instrument panel with the indicating part can be installed on the housing. Through the above preliminary assembly, since the linkage part of the indicating shaft is assembled with the output shaft at the same time, the linkage part of the indicating shaft is still in the middle or upper middle part of the housing in the axial direction. When assembling the instrument box, the disassembly and assembly between the indicating part and the linkage part of the indicating shaft can avoid the gear set and other parts in the housing, so that the assembly process is simpler and faster, thereby improving the assembly efficiency.

[0012] The present invention is further configured as follows: a liquid crystal display and a circuit board electrically connected to a main circuit board are provided on the housing, and a magnetic encoder capable of sensing the rotation frequency of the indication shaft and transmitting signals to the circuit board is provided at the indication shaft in the housing.

[0013] By adopting the above technical solution, a liquid crystal display, a circuit board and a magnetic encoder for sensing the rotation frequency of the indication shaft are arranged on the outer shell, so that the numerical value of the execution force required by the operator can be displayed on the liquid crystal display, thereby judging the usage status of the driven product by the numerical value.

[0014] The present invention is further configured as follows: at least one transverse end face of the instrument box is a light-transmitting area, and a plurality of light-transmitting holes are formed on the plate body of the light-transmitting area.

[0015] By adopting the above technical solution, the light source of the LED lamp can be diffused to the outside through the light-transmitting hole, so that the structure is simple and the processing is convenient.

[0016] The present invention is further configured as follows: the fault locating mechanism includes a mounting hole opened on the outer shell and corresponding to the output shaft, and an adjusting screw arranged in the mounting hole and movable back and forth along the mounting hole, the adjusting screw includes an adjusting part and a threaded part threadedly screwed to the mounting hole, the outer sleeve of the adjusting screw is provided with a nut threadedly screwed to the adjusting screw, and a sealing member is provided between the nut, the adjusting part of the adjusting screw and the outer shell.

[0017] Among them, a countersunk hole is opened at one end of the mounting hole facing the outside of the shell, and an axial end of the nut extends into the countersunk hole. The sealing member includes a sealing ring between the nut and the bottom end face of the countersunk hole and a sealing ring between the inner wall of the nut and the adjusting part of the adjusting screw.

[0018] With the above technical solution, the fault positioning mechanism is set to enable the output shaft to be positioned in time when the electric actuator fails or the driven product fails, so as to prevent the output shaft from still providing power to it when the fault occurs. The adjusting screw cooperates with the adjusting nut to achieve locking and positioning, wherein the setting position of the seal can achieve sealing to prevent the external medium from entering the housing through the fault positioning mechanism, and at the same time, the seal does not directly contact the thread, and the seal will not be damaged during disassembly and assembly, which not only ensures the sealing performance, but also extends the service life of the seal.

[0019] The present invention is further configured as follows: a power-off power reset device is provided in the housing, and the power-off power reset device includes a continuous power supply fixed in the housing and electrically connected to the main circuit board.

[0020] The continuous power supply includes a power circuit board fixed in the shell and electrically connected to the main circuit board, and a plurality of capacitors arranged on the power circuit board.

[0021] With the above technical solution, when the external power supply is cut off (power outage), the driving force of the electric actuator on the driven object (such as a valve) will be cut off. At this time, the valve is still in a working state (open or closed). Under special working conditions (such as chemical, flammable and explosive), if the electric actuator cannot reset the valve, there will be a great safety hazard. The setting of the power-off power reset device can switch the power supply line of the main circuit board when the external power supply is cut off, prompting the motor to drive the output shaft again, thereby resetting the valve and eliminating the safety hazard caused by power outage.

[0022] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of the present invention;

[0025] Figure 3 for Figure 2 An enlarged schematic diagram of part I;

[0026] Figure 4 It is a partial three-dimensional schematic diagram of an embodiment of the present invention;

[0027] Figure 5 A three-dimensional schematic diagram of an instrument mechanism in an embodiment of the present invention;

[0028] Figure 6 is a three-dimensional schematic diagram of an indicating portion of an indicating shaft in an embodiment of the present invention;

[0029] Figure 7 It is a three-dimensional schematic diagram of the linkage part of the indicator shaft in the embodiment of the present invention. DETAILED DESCRIPTION

[0030] like Figure 1 — Figure 7The electric actuator shown in the figure includes a housing 1, a motor 2 arranged in the housing 1, a main circuit board 12 for controlling the opening and closing of the motor, a gear set 3 linked to the motor 2, and an output shaft 4 linked to the gear set 3. The motor 2 drives the gear set 3, the gear set 3 is linked to the output shaft 4, and the output shaft 4 can output power. The housing 1 is provided with an instrument mechanism 5 for displaying the status, the instrument mechanism 5 is provided with an indication shaft 51 linked to the output shaft 4, the instrument mechanism 5 includes an instrument box 52 exposed outside the housing 1 and arranged in a polygonal shape, a pointer 53 linked to the indication shaft 51 and rotating with the indication shaft is provided on the longitudinal top end face of the instrument box 52, and each transverse end face of the instrument box 52 is a status prompt end face 521, the instrument box 52 can be rectangular, hexagonal or octagonal, and the number of its transverse end faces can be set according to needs. The instrument box 52 is provided with an LED lamp 54 that can emit light and a circuit board 55 that controls the LED lamp 54 to emit light. The circuit board 55 is provided with a capacitor. The circuit board 55 is electrically connected to the main circuit board 12. The LED lamp 54 can emit light in multiple colors. According to the control of the circuit board 55, different colors can represent different states of the instrument box 52. For easy observation, the instrument box 52 is provided with a light-transmitting area 56 that can cause the light source of the LED lamp 54 to be revealed to the outside. In the embodiment of the present invention, the light-transmitting area 56 is at least one end face of the instrument box 52 in the horizontal direction, and a plurality of light-transmitting holes 561 are opened on the end face of the light-transmitting area 56. Of course, the instrument box 52 can also be made of a light-transmitting material, and the entirety of the instrument box 52 can be light-transmitting. In the above scheme, the instrument box 52 is exposed outside the housing 1, and the instrument box 52 is a polygon with multiple status prompt end faces in the horizontal direction. When the electric actuator is installed at a lower installation position where the operator can observe it more intuitively, the operator can conveniently observe the indication status on the instrument box 52; when the electric actuator is installed at a higher position, the operator cannot intuitively observe the status prompt end face 521 of the instrument box 52, the LED light 54 inside the instrument box 52 can be used to display the indication status of the instrument, and the light-transmitting area 56 is set to allow the internal light source of the instrument box 52 to pass through the instrument box 52; the setting of the above scheme enables the operator to directly and conveniently observe the execution dynamics of the electric actuator regardless of the installation position. The setting of the capacitor on the circuit board 55 can make the LED light 54 have the function of delayed extinguishing, that is, the capacitor stores electrical energy that can cause the LED light 54 to delay extinguishing. When the external power supply to the electric actuator is cut off or powered off, the LED light 54 can provide a short power supply to it through the capacitor on the circuit board 55, so that the LED light 54 can be turned off with a delay. In special cases, the operator can judge the position of the electric actuator according to the position of the LED light 54, and thus turn off the electric actuator.

[0031] In the embodiment of the present invention, in order to facilitate the disassembly and assembly of the instrument box 52, the indicating shaft 51 includes an indicating part 511 linked with the pointer 53 and a linkage part 512 linked with the output shaft 4, and the indicating part 511 and the linkage part 512 are detachably connected. A plug-in slot 5111 is provided at the connection between the indicating part 511 and the linkage part 512, and the linkage part 512 is provided with a plug-in block 5121 adapted to the plug-in slot 5111. The plug-in part of the two can also be fixed by a pin, or the plug-in part of the two can be over-matched, which is also feasible. Of course, the plug-in slot can also be set on the linkage part 512, and the plug-in block can be set on the indicating part 511, which is also feasible. In the process of assembling the output shaft 4, the linkage part 512 of the indicating shaft 51 can be assembled with the output shaft 4, and the indicating part 511 of the indicating shaft 51 can be assembled with the instrument box 52. Through the above-mentioned preliminary assembly, since the linkage portion 512 of the indicating shaft 51 is assembled simultaneously with the output shaft 4, the linkage portion 512 of the indicating shaft 51 is still located in the middle or upper middle portion of the axial direction of the housing 1. When assembling the instrument box 52, the disassembly and assembly between the indicating portion 511 and the linkage portion 512 of the indicating shaft 51 can avoid the gear set 3 and other parts in the housing 1, thereby making the assembly process simpler and faster, thereby improving the assembly efficiency.

[0032] In order to realize intelligent observation, a liquid crystal display 6 and a circuit board electrically connected to the main circuit board 12 are provided on the housing 1, and a magnetic encoder 7 is provided at the indicating shaft 51 in the housing 1, which can sense the rotation frequency of the indicating shaft 51 and can transmit signals to the circuit board. The rotation frequency of the indicating shaft 51 can be transmitted to the circuit board through the magnetic encoder 7, and the circuit board feeds back the value to the liquid crystal display 6 through the internal program, so that the observer can observe the value intuitively, thereby realizing intelligent digital display.

[0033] A fault locating mechanism 8 is provided on the housing 1 of the embodiment of the present invention at the mounting position of the output shaft 4. The fault locating mechanism 8 is provided so that when a fault occurs in the electric actuator or the driven product, the output shaft 4 can be positioned in time to prevent the output shaft 4 from still providing power to it in the event of a fault. The fault locating mechanism 8 includes a mounting hole 11 opened on the housing 1 and corresponding to the output shaft 4, and an adjusting screw 81 provided on the mounting hole 11 and movable back and forth along the mounting hole 11. The adjusting screw 81 includes an adjusting portion 811 and a threaded portion 812 threadedly connected to the mounting hole 11. The outer sleeve of the adjusting screw 81 is provided with a nut 82 threadedly connected to the adjusting screw 81. A sealing member is provided between the nut 82 and the adjusting portion 811 of the adjusting screw 81 and the housing 1. A countersunk hole 111 is provided at one end of the mounting hole 11 facing the outside of the housing 1, and one axial end of the nut 82 extends into the countersunk hole 111. The seal includes a sealing ring 83 between the nut 82 and the bottom end surface of the countersunk hole 111 and a sealing ring 83 between the inner wall of the nut 82 and the adjusting portion 811 of the adjusting screw 81. The adjusting screw 81 cooperates with the nut 82 to achieve locking and positioning, wherein the setting position of the seal can achieve sealing to prevent the external medium from entering the housing 1 through the fault positioning mechanism 8, and at the same time, the seal does not directly contact the thread, and the seal will not be damaged during disassembly and assembly, which not only ensures the sealing performance but also extends the service life of the seal.

[0034] In an embodiment of the present invention, when the external power supply is powered off (power outage), the driving force of the electric actuator on the driven object (such as a valve) will be cut off. At this time, the valve is still in a working state (open or closed). Under special working conditions (such as chemical, flammable and explosive), if the electric actuator cannot reset the valve, there will be a large safety hazard. In order to eliminate this hazard, a power-off power reset device 9 is provided in the housing 1, and the power-off power reset device 9 includes a continued power supply fixedly arranged in the housing 1 and electrically connected to the main circuit board 12. The continued power supply includes a power supply circuit board 91 fixedly arranged in the housing 1 and electrically connected to the main circuit board 12, and a plurality of capacitors 92 arranged on the power supply circuit board 91. The setting of the power-off power reset device 9 can switch the power supply line of the main circuit board 12 when the external power supply is powered off, prompting the motor 2 to drive the output shaft 4 again, thereby resetting the valve, thereby eliminating the safety hazard caused by power failure. The continuous power supply is set as a power circuit board 91 and a capacitor 92. The capacitor 92 can store the power supply of the motor 2 once, so that the output shaft 4 has the electric energy for resetting the linkage valve. When the external power supply continues to supply power, the main circuit board 12 can charge the capacitor 92 again, so that the capacitor 92 can store electric energy again, so that the motor 2 can still be provided with a driving source when the power is cut off next time. In addition, the setting of the power circuit board 91 can set a corresponding driving program. For example, the reset of the valve can be in an open state or a closed state, and the rotation direction of the motor shaft of the motor 2 can be controlled (clockwise or counterclockwise rotation), and the output shaft 4 linked with the motor 2 can be linked to reset the valve. Of course, the program can also be directly set on the main circuit board 12, which is also feasible. It should be noted that the main circuit board 12 and the circuit board and the power circuit board 91 can be connected through wires or power connectors, so that each component is integrated in the housing 1, which is not only convenient for assembly, but also has a reasonable layout and saves the installation space in the housing 1.

Claims

1. An electric actuator, comprising a housing, a motor arranged in the housing, a main circuit board for controlling the opening and closing of the motor, a gear set linked to the motor, and an output shaft linked to the gear set, the housing is provided with a fault locating mechanism at the installation position of the output shaft, the housing is provided with an instrument mechanism for displaying the status, and the instrument mechanism is provided with an indicating shaft linked to the output shaft, characterized in that: The instrument mechanism includes an instrument box exposed outside the shell and arranged in a polygonal shape, a pointer that is linked to the indicating shaft and rotates with the indicating shaft is provided on the longitudinal top end face of the instrument box, and each lateral end face of the instrument box is a status prompt end face. An luminous LED lamp and a circuit board that controls the LED lamp to emit light and is electrically connected to the main circuit board are provided inside the instrument box, and a light-transmitting area that can cause the light source of the LED lamp to be revealed to the outside is provided on the instrument box. The indicating shaft includes an indicating part that is linked to the pointer and a linkage part that is linked to the output shaft, and the indicating part and the linkage part are detachably connected. A plug-in slot is provided at the connection between the indicating part and the linkage part, and a plug-in block that is adapted to the plug-in slot is provided on the linkage part. A liquid crystal display and a circuit board that is electrically connected to the main circuit board are provided on the shell, and a magnetic encoder that can sense the rotation frequency of the indicating shaft and can implement signal transmission with the circuit board is provided at the indicating shaft in the shell, and a power-off power reset device is provided in the shell, and the power-off power reset device includes a continuous power supply that is fixed in the shell and electrically connected to the main circuit board.

2. The electric actuator according to claim 1, characterized in that: At least one transverse end face of the instrument box is a light-transmitting area, and a plurality of light-transmitting holes are provided on the plate body of the light-transmitting area.

3. The electric actuator according to claim 1, characterized in that: The instrument box is made of a transparent material through which the light source can pass.

4. The electric actuator according to claim 1, characterized in that: The fault locating mechanism includes a mounting hole opened on the outer shell and corresponding to the output shaft, and an adjusting screw arranged in the mounting hole and movable back and forth along the mounting hole. The adjusting screw includes an adjusting part and a threaded part threadedly connected to the mounting hole. The outer sleeve of the adjusting screw is provided with a nut threadedly connected to the adjusting screw. A sealing member is provided between the nut, the adjusting part of the adjusting screw and the outer shell.

5. The electric actuator according to claim 4, characterized in that: A countersunk hole is formed at one end of the mounting hole facing the outside of the housing, and an axial end of the nut extends into the countersunk hole. The sealing member includes a sealing ring between the nut and the bottom end face of the countersunk hole and a sealing ring between the inner wall of the nut and the adjusting part of the adjusting screw.

6. The electric actuator according to claim 1, characterized in that: The sustained power supply comprises a power circuit board fixedly arranged in the shell and electrically connected to the main circuit board, and a plurality of capacitors arranged on the power circuit board.

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