Electric actuator with speed change, display and overspeed protection functions

Abstract

An electric actuator with speed change, display and overspeed protection functions comprises a power assembly, a display assembly, a speed change assembly and an overspeed protection assembly. The power assembly is arranged between the display assembly and the speed change assembly and drives the display assembly and the speed change assembly, and the lower end of the overspeed protection assembly is slidably connected to the power assembly. The valve has the advantages that the opening degree of the valve can be known through the display pointer or the display piece in the display assembly; a valve is closed or opened through a power assembly, a speed change assembly, a central information processor and a motor for controlling the valve, and meanwhile, under the action of the speed change assembly, the closing or opening speed of the valve is divided into a high-speed gear, a middle-speed gear and a low-speed gear. For different flow speeds in the pipeline, the motor for controlling the valve is controlled to close or open the valve at the corresponding speed by adjusting the gears of the speed change assembly, and the problem that resources are wasted due to the fact that the flow speed in the pipeline is too high and the valve cannot be closed in time is solved. And thirdly, the overspeed protection assembly can effectively prevent the input shaft from moving in the electric actuator to damage internal weak parts due to too high rotating speed and the action of axial force through a measurement sensor.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric actuator field, concretely relates to a kind of electric actuator with variable speed, display and overspeed protection function. BACKGROUND

[0002] Electric actuator controls the opening and closing of valve through some devices, in application scene, the valve needing to be controlled by electric actuator is mostly enclosed in pipeline, and the end of pipeline is generally connected to the container for collecting liquid or gas, if the collection amount in container is about to reach predetermined amount, it is necessary to reduce the opening of valve;But now only the difference between the collection amount in container and predetermined amount can be observed in factory building to try to adjust the opening of valve, when container is relatively close to operator, it can be done, but when container is relatively far from operator, this method is not good for use. In addition, the speed of electric actuator for closing or opening valve is limited to one kind, when collection amount is about to reach predetermined amount, resource waste will be caused due to fast flow rate in pipeline and valve cannot be quickly closed;Or the flow rate in pipeline is very slow, after closing valve, collection amount does not reach predetermined amount, it is necessary to open valve again, so it will affect the efficiency of collection work.

[0003] The input shaft of electric actuator is driven by gear or other transmission member and external motor output shaft, and the rotation speed of external motor output shaft is very fast, and the rotation speed of the end of electric actuator is basically consistent with the speed of opening and closing valve, but fast opening and closing will affect service life for valve, thus, to reduce the speed inside electric actuator, the first transmission in electric actuator generally adopts worm gear meshing transmission, external motor output shaft transmits power to worm shaft through transmission member, and worm shaft will move along axial direction under the action of high rotation speed and axial force in electric actuator, which not only affects the service life of electric actuator, but also directly damages electric actuator in serious case. SUMMARY

[0004] The utility model provides a kind of electric actuator with variable speed, display and overspeed protection function to solve the technical problem mentioned above.

[0005] To achieve the above object, the technical scheme of the utility model provides a kind of electric actuator with variable speed, display and overspeed protection function, including power component, display component, variable speed component, overspeed protection component;Power component is arranged between display component, variable speed component, and power component respectively drives display component, variable speed component, and overspeed protection component is arranged above power component;Power component includes first gear, second gear, wherein first gear is power component input end and is engaged with external motor gear, and second gear is power component output end;The variable speed component includes emergency stop component, variable speed gear set, wherein emergency stop component is arranged between variable speed gear set, second gear;The emergency stop component includes emergency stop gear, and the emergency stop gear is engaged with second gear, input gear of variable speed gear set respectively or disengaged;The variable speed component further includes start-stop sensor for sending opening or closing valve to central information processor, and start-stop sensor is arranged in one side of variable speed gear set, and variable speed gear set output end is slidably connected with start-stop sensor;The display component includes display disc, display gear set, and the display gear set is directly engaged with second gear or idler wheel is added between display gear set and second gear;The display disc is arranged above display gear set, and at least one display sheet or one display pointer is arranged on the display disc, and the deflection angle of display pointer or display sheet on the display disc corresponds to the opening of valve;The overspeed protection component includes overspeed measuring rod, overspeed measuring sheet, measuring sensor, one end of the overspeed measuring rod is clamped in two spiral blocks on worm, and the axis of overspeed measuring rod is perpendicular to the axis of worm;The other end of overspeed measuring rod is fixedly connected with one end of overspeed measuring sheet, and the included angle between overspeed measuring rod and overspeed measuring sheet is greater than 0° and less than 180°;Measuring sensor is arranged on the shell and located on one side of overspeed measuring rod;The other end of overspeed measuring sheet is slidably connected in measuring sensor.

[0006] Further, a kind of electric actuator with variable speed, display and overspeed protection function further includes shell, and the power component, display component, variable speed component, overspeed protection component are all arranged on the shell;The power component includes worm, worm wheel, transmission rod, and the first gear is arranged at one end of worm and the axis is parallel to the axis of worm, and worm is rotatably arranged on the shell;The worm wheel is arranged at the end of transmission rod and the axis is parallel to the axis of transmission rod, and worm wheel is engaged with worm, and the axis of worm wheel is perpendicular to the axis of worm;Transmission rod is rotatably arranged on the shell, and the axis of transmission rod is perpendicular to the axis of worm;Second gear is sleeved on transmission rod, and the axis of second gear is parallel to the axis of transmission rod and second gear is arranged on one side of worm wheel.

[0007] Further, the emergency stop assembly comprises an emergency stop assembly support shaft, a spring, a spring support plate, an emergency stop button and a connecting block, wherein the emergency stop assembly support shaft is vertically arranged on the shell, the spring support plate is arranged on the emergency stop assembly support shaft, and one end of the spring is fixedly arranged on the spring support plate; the emergency stop gear is slidably connected to the emergency stop assembly support shaft, and the axis of the emergency stop gear is parallel to the axis of the emergency stop assembly support shaft; the other end of the spring is fixedly arranged on one side of the emergency stop gear; the connecting block is fixedly connected to the other side of the emergency stop gear; and the emergency stop button is arranged on one side of the emergency stop gear and is rotatably connected to the connecting block at the lower end. Preferably, when the transmission fails in the variable speed gear set and behind the variable speed gear set, the power transmitted to the variable speed gear set can be disconnected by pressing the emergency stop button immediately, thereby protecting the weak parts inside the electric actuator.

[0008] Further, the variable speed assembly further comprises a shifting block, the shifting block is fixedly arranged on the output gear of the variable speed gear set, and the shifting block is provided with a cam at the end; further, the start-stop sensor comprises a pushing block, the pushing block is fixedly connected or slidably connected to the start-stop sensor; the cam on the shifting block is slidably connected with the pushing block or is disconnected with the pushing block. Preferably, the shifting block is provided with three rotating speeds, and the shifting block slides on the pushing block of the start-stop sensor while rotating, the start-stop sensor sends the rotating speed information to the central information processor after sensing the rotating speed of the shifting block, and the central information processor matches the motor of the control valve to close or open the valve at the same speed as the shifting block.

[0009] Further, the display assembly comprises a display block, one end of the display block is fixedly connected to the output gear of the display gear set, and the other end of the display block is provided with a display disc; and the display disc is fixedly connected or movably connected with display sheets or a display pointer. Preferably, the speed of opening or closing the valve is consistent with the rotating speed of the display sheets or the display pointer, the speed of opening or closing the valve can be known through the rotating speed of the display sheets or the display pointer, and the opening size of the valve can also be known from the deflection angle of the display sheets or the display pointer.

[0010] Further, the electric actuator with the variable speed, display and over-speed protection functions further comprises a terminal, the terminal is fixedly connected to the shell; the lead of the start-stop sensor is connected to the terminal; the lead of the measurement sensor is connected to the terminal; and the lead of the central information processor is also connected to the terminal. Preferably, the start-stop sensor and the measurement sensor send information to the central information processor through the terminal, and the central information processor processes corresponding tasks through the received information.

[0011] The advantages and beneficial effects of the electric actuator are as follows:

[0012] 1. The operator can know the opening size of the valve by observing the display sheet or display disc in the display assembly, and the utility model discloses through power assembly, speed change assembly, central information processor and the motor of control valve realizes closing or opening valve, and under the action of speed change assembly, the speed of closing or opening valve is divided into fast gear, medium speed gear and slow speed gear, and the motor of control valve is adjusted to the corresponding speed to close or open the valve in the face of different flow rate in the pipeline, so that the problem of resource waste caused by too fast flow rate in the pipeline and not enough time to close the valve is solved, and when the collection amount in the container is not much different from the predetermined amount, slow closing valve can not only collect the predetermined amount, but also save the time of continuously adjusting the opening of the valve for other work.

[0013] 2. The utility model discloses still can fast collection to improve production efficiency, namely directly open the valve to maximum, then when the collection amount reaches the predetermined amount, fast closing valve.

[0014] 3. The utility model discloses increasing overspeed protection assembly on the input shaft of electric actuator, and overspeed protection assembly can effectively prevent the input shaft from moving in the electric actuator and damaging the internal weak parts under the action of too fast rotating speed and axial force through measurement sensor. SHEET

[0015] Figure 1 It is the whole structure schematic diagram of the utility model;

[0016] Figure 2 It is the internal structure schematic diagram of the utility model;

[0017] Figure 3 It is the power assembly structure schematic diagram of the utility model;

[0018] Figure 4 It is the internal structure schematic diagram of the utility model;

[0019] Figure 5 It is the emergency stop assembly structure schematic diagram of the utility model;

[0020] Figure 6 It is the transmission route schematic diagram of the gear group of the utility model;

[0021] Figure 7 It is the start-stop sensor structure schematic diagram of the utility model Figure 1 ;

[0022] Figure 8 It is the transmission route schematic diagram of the display gear group of the utility model;

[0023] Figure 9 It is the overspeed protection assembly structure schematic diagram of the utility model;

[0024] Figure 10The utility model discloses display component local structure schematic diagram Figure 1 ;

[0025] Figure 11 The utility model discloses display component local structure schematic diagram Figure 2 ;

[0026] Figure 12 The utility model discloses display component local structure schematic diagram Figure 3 ;

[0027] Figure 13 The utility model discloses start -stop sensor structure schematic diagram Figure 2 .

[0028] Its drawing: casing 40, power assembly 10, speed change assembly 20, over -speed protection assembly 30, first gear 11, worm 12, transmission rod 13, worm wheel 14, second gear 15, guard frame 42, baffle 41, terminal 43, speed change gear set 21, emergency stop assembly 22, emergency stop assembly support shaft 23, emergency stop gear 24, spring 25, spring support plate 26, emergency stop button 27, connecting block 28, speed change lever 29, shift block 210, start -stop sensor 211, push block 212, push spring 213, fixed block 214, over -speed measuring rod 31, over -speed measuring piece 32, measurement sensor 33, disc spring 34, sliding slot 35, display assembly 50, third gear 51, display gear set 52, display block 53, display disc 54, display piece one 55, display piece two 56, fixed rod 57, display piece three 58, display pointer 59. DETAILED DESCRIPTION

[0029] Referring to Figure 1 、 Figure 2 、 Figure 10As shown in the figure, an electric actuator with variable speed, display and overspeed protection function, comprising a power assembly 10, a variable speed assembly 20, a display assembly 50, a housing 40, an overspeed protection assembly 30, the housing 40 is used to install the power assembly 10, the variable speed assembly 20, the display assembly 50 and the overspeed protection assembly 30. The power assembly 10 is used to receive the power provided by the external device to the electric actuator and transmit the power to the variable speed assembly 20 and the display assembly 50, the output end of the variable speed assembly 20 is controlled by the start-stop sensor 211, the central information processor to open and close the valve and the speed of the valve opening and closing; the display assembly 50 is provided with display sheet one 55 and display sheet two 56, the relative deflection angle of the display sheet one 55 and the display sheet two 56 is consistent with the opening degree of the valve, and the opening degree of the valve can be known through the relative deflection angle of the two display sheets; the overspeed protection assembly 30 is used to prevent the input shaft from moving inside the electric actuator due to too fast speed and axial force. The housing 40 is also provided with a wiring terminal 43, the lead of the start-stop sensor 211 in the variable speed assembly 20 is connected to the wiring terminal 43, the wiring terminal 43 is also connected with the lead of the central information processor, the power line of the electric actuator and the lead of the measurement sensor 33 in the overspeed protection assembly 30; the start-stop sensor 211, the measurement sensor 33 and the wiring terminal 43 can send signals to the central information processor.

[0030] Referring to Figure 3 , Figure 4 As shown in the figure, the housing 40 comprises a partition plate 41, the display assembly 50 and the variable speed assembly 20 are installed on the partition plate 41 in the housing 40; the power assembly 10 comprises a first gear 11, a worm 12, a transmission rod 13, a worm gear 14 and a second gear 15, wherein the first gear 11 is engaged with the gear of the external motor, the first gear 11 is coaxial with the worm 12, the worm 12 is rotatably arranged on the housing 40, the worm gear 14 is arranged at one end of the transmission rod 13, the transmission rod 13 is rotatably arranged on the housing 40 through the partition plate 41, the worm 12 is engaged with the worm gear 14, the axis of the worm 12 and the worm gear 14 are perpendicular to each other, and the partition plate 41 seals the worm gear 14 and the worm 12 in the housing 40 to prevent dust from entering. The second gear 15 is sleeved in the middle of the transmission rod 13; the first gear 11 is engaged with the gear of the external motor to transmit power to the worm 12, and the worm 12 transmits power to the transmission rod 13 by engaging with the worm gear 14.

[0031] Referring to Figure 4 , Figure 5As shown, the transmission assembly 20 includes a transmission gear set 21, an emergency stop assembly 22, which is arranged on the shell 40 through the partition plate 41; the emergency stop assembly 22 includes an emergency stop assembly support shaft 23, an emergency stop gear 24, a spring 25, a spring support plate 26, an emergency stop button 27, and a connecting block 28, wherein the emergency stop assembly support shaft 23 is rotationally arranged on the shell 40, the spring support plate 26 is fixedly arranged on the emergency stop assembly support shaft 23, one end of the spring 25 is fixedly arranged on the spring support plate 26, the other end of the spring 25 is fixedly arranged on one side of the emergency stop gear 24, the emergency stop gear 24 is slidingly connected on the emergency stop assembly support shaft 23, the center of the emergency stop gear 24 is provided with a groove, the emergency stop assembly support shaft 23 is a prism, the other side of the emergency stop gear 24 is fixedly arranged with the connecting block 28, and the lower end of the emergency stop button 27 is rotationally connected on the connecting block 28. Since the emergency stop button 27 is rotationally connected on the connecting block 28 fixedly connected with the emergency stop gear 24, when the emergency stop gear 24 rotates, pressing the emergency stop button 27 downward will not scratch the palm and sprain the wrist. The emergency stop gear 24 is respectively engaged with the second gear 15 on the transmission rod 13 and the input gear of the transmission gear set 21, and the transmission rod 13 transmits power to the transmission gear set 21 through the second gear 15 and the emergency stop gear 24; when a fault occurs in the transmission gear set 21, the operator presses the emergency stop button 27, the emergency stop button 27 presses the emergency stop gear 24 downward through the connecting block 28 connected with the emergency stop gear 24, and when the emergency stop button 27 is pressed to the bottom, the emergency stop gear 24 is respectively disengaged from the second gear 15 and the transmission gear set 21. If the emergency stop button 27 is released, the emergency stop gear 24 is released by the spring 25 to return to the position of being engaged with the second gear 15 and the transmission gear set 21.

[0032] Referring to Figure 1 , Figure 4 , Figure 6 , Figure 9 As shown, the transmission gear set 21 includes a transmission lever 29 and a push block 210, and in this embodiment, the transmission gear set 21 has one input end and two output ends, the input end of the transmission gear set 21 is engaged with the emergency stop gear 24, and one push block 210 is fixedly arranged on each of the two output ends; in this embodiment, one end of the push block 212 is fixedly connected with the output end of the transmission gear set 21, and the other end of the push block 212 is provided with an arc-shaped block extending to one side. The transmission gear set 21 is provided with the transmission lever 29, which can adjust the rotating speed of the input gear to the output gear of the transmission gear set 21; in the position shown in the figure, there are five levels of speed reduction between the input gear and the output gear of the transmission gear set 21, and the rotating speed of the push block 210 is the slowest; lifting the transmission lever 29 by one level, there are three levels of speed reduction between the input gear and the output gear of the transmission gear set 21, and the rotating speed of the push block 210 is neither fast nor slow; lifting the transmission lever 29 by another level, there is one level of speed reduction between the input gear and the output gear of the transmission gear set 21, and the rotating speed of the push block 210 is the fastest.

[0033] Referring to Figure 1 , Figure 2 , Figure 4 , Figure 7 , the variable speed assembly 20 further comprises start-stop sensors 211, which include push blocks 212 and push springs 213; the shell 40 further comprises a protective frame 42, which is detachably connected to the shell 40 and used to protect the internal components of the electric actuator. In the embodiment, two start-stop sensors 211 are provided and arranged on one side of the two dials 210 respectively. The push block 212 is slidingly connected in one of the start-stop sensors 211 and has one end connected to the push spring 213 and the other end connected to the internal information transmitting device. The two dials 210 rotate at the same speed and in the same direction, but one of the dials 210 always lags behind the other dial 210 by half a turn. When the dial 210 that is always in contact with the push block 212 is in the air, the other dial 210 is in an idle state. One of the start-stop sensors 211 is set to be on and the other sensor is set to be off. Only when the dial 210 that is in contact with the start-stop sensor 211 set to be on and the other dial 210 that is in contact with the start-stop sensor 211 set to be off, the start-stop sensor 211 sends a signal to the central information processor, and the central information processor sends a start signal to the valve motor to open the valve. Similarly, only when the dial 210 that is in contact with the start-stop sensor 211 set to be off and the other dial 210 that is in contact with the start-stop sensor 211 set to be on, the valve is closed. This provides a double insurance for the electric actuator to prevent the valve from being opened or closed by mistake. When the dial 210 rotates, it slides on the push block 212 and pushes the push block 212 to move in the start-stop sensor 211. The start-stop sensor 211 is provided with a sensing device for sensing the moving speed of the push block 212. The sensing device in the start-stop sensor 211 senses the moving speed of the push block 212 and then transmits the information of the moving speed of the push block 212 to the signal transmitting device in the start-stop sensor 211. The signal transmitting device transmits the signal to the central information processor, which matches the speed of the motor controlling the valve to close or open the valve, and finally matches the speed of the motor controlling the valve to the speed of the dial 210.

[0034] Referring to Figure 13 , the start-stop sensor 211 has the following embodiment. In the second embodiment of the start-stop sensor 211, the start-stop sensor 211 comprises a fixed block 214, which is fixedly arranged on one side of the start-stop sensor 211. The fixed block 214 is an inner circular arc block matching the rotating track of the dial 210. When the dial 210 rotates for a full circle, half of it slides in the fixed block 214 and the other half is in the air.

[0035] With reference to Figure 4 , Figure 8 , the display assembly 50 is arranged behind the gear shifting assembly 20, the display assembly 50 comprises a display gear set 52, a third gear 51 and a display block 53, the third gear 51 is rotatably arranged on the partition 41 through a connecting shaft, the third gear 51 is engaged with the second gear 15 on the rotating rod and the input gear of the display gear set 52 respectively, and the display block 53 is fixedly arranged on the output gear of the display gear set 52. In the embodiment, the parameters of the emergency stop gear 24 in the emergency stop assembly are consistent with those of the third gear 51; the gear shifting assembly 21 and the display gear set 52 are both three-gear shifting and five-gear shifting, and the output gear rotating speed is consistent when the two gear sets are in the same gear and the input gear rotating speed is consistent. The second gear 15 on the transmission rod 13 is engaged with the emergency stop gear 24 and the third gear 51 respectively, and the rotating speed of the emergency stop gear 24 is consistent with that of the third gear 51 due to the consistent parameters of the emergency stop gear 24 and the third gear 51. The emergency stop gear 24 is engaged with the input gear in the gear shifting assembly 21, and the third gear 51 is engaged with the input gear in the display gear set, so the rotating speed of the output gear of the gear shifting assembly 21 is consistent with that of the display gear set, and thus the rotating speed of the display block 53 arranged on the output gear of the display gear set 52 is consistent with that of the display block 53 arranged on the output gear of the display gear set 52.

[0036] With reference to Figure 10As shown, the display assembly 50 further comprises a display disc 54, a display sheet one 55, a display sheet two 56, and a fixed rod 57. The display block 53 is fixedly arranged at one end of the output gear of the display gear set 52. The display disc 54 is arranged at the other end of the display block 53. The display sheet one 55 is arranged on the display disc 54. The display disc 54 is provided with a plurality of convex blocks. The display sheet one 55 is provided with a plurality of concave grooves on one side and a smooth surface on the other side. The depth of the concave grooves of the display sheet one 55 is greater than the thickness of the convex blocks of the display disc 54. The display block 53 is arranged in the cylindrical hole of the body along the axial direction. The fixed rod 57 is a cylindrical rod. The fixed rod 57 is provided with a convex block at one end. The convex block of the fixed rod 57 is arranged in the convex groove on the output shaft of the display gear set 52. The fixed rod 57 is provided with a plurality of convex blocks at the other end. The display sheet two 56 is arranged on the convex blocks of the fixed rod 57. The display sheet two 56 is provided with a plurality of concave grooves on one side and a smooth surface on the other side. The depth of the concave grooves of the display sheet two 56 is greater than the thickness of the convex blocks of the fixed rod 57. The display sheet one 55 is provided with an open letter. The display sheet two 56 is provided with a close letter. In this embodiment, the display block 53 is fixedly arranged on the output gear of the display gear set 52 and rotates with the gear. Therefore, the display sheet one 55 arranged on the display block 53 rotates with the display block 53. The display sheet two 56 is arranged on the fixed rod 57. The fixed rod 57 is arranged on the output shaft of the display gear set 52. The output shaft of the display gear set 52 is fixedly arranged on the partition plate 41. Therefore, the display sheet two 56 is static on the display sheet one 55. Since the contact surfaces of the display sheet one 55 and the display sheet two 56 are smooth surfaces, the display sheet one 55 will not scratch the display sheet two 56 when rotating. The rotating speed of the display block 53 is consistent with the rotating speed of the dial block 210. The rotating speed of the dial block 210 is consistent with the rotating speed of the control valve motor. Therefore, the rotating speed of the display sheet one 55 can indicate the speed of the valve switch. Similarly, the deflection angle between the display sheet one 55 and the display sheet two 56 can indicate the opening size of the valve.

[0037] Referring to Figure 11 , Figure 12 As shown, the display block 53 has the following embodiments. Regarding the second embodiment of the display block 53, the display assembly 50 further comprises a display sheet three 58. The display block 53 is still fixedly arranged at one end of the output gear of the display gear set 52. The display sheet three 58 is fixedly connected to the display disc 54 at the other end of the display block 53. The display sheet three 58 is provided with open and close letters. The open and close letters are oppositely arranged. A circle of scales is arranged on the periphery of the display disc 54. Regarding the third embodiment of the display block 53, the display assembly 50 further comprises a display pointer 59. The display block 53 is still fixedly arranged at one end of the output gear of the display gear set 52. The display pointer 59 is fixedly connected to the display disc 54 at the other end of the display block 53. A circle of scales is arranged on the periphery of the display disc 54. Open and close letters are arranged on the opposite scales.

[0038] Referring to Figure 9 As shown, the overspeed protection assembly 30 comprises an overspeed measuring rod 31, an overspeed measuring piece 32, a measuring sensor 33, and disc springs 34. The partition plate 41 is provided with a sliding groove 35, the overspeed measuring rod 31 is slidably arranged in the sliding groove 35, one end of the overspeed measuring rod 31 is clamped on two helical blocks of the worm, the other end is fixedly connected to one end of the overspeed measuring piece 32, and the other end of the overspeed measuring piece 32 is slidably connected in the measuring sensor 33. In this embodiment, the axis of the worm 12 is perpendicular to the axis of the overspeed measuring rod 31, and the axis of the worm 12 is parallel to the long axis of the overspeed measuring piece 32. When the worm rotates, the lower end of the overspeed measuring rod 31 slides along the helical wall of the helical block and pushes the overspeed measuring piece 32 to slide in the measuring sensor 33. When the worm does not move, the value of the overspeed measuring rod 31 moving in the measuring sensor 33 does not exceed the measurement range set by the measuring sensor 33. If the worm moves, the value of the overspeed measuring rod 31 moving in the measuring sensor 33 exceeds the measurement range set by the measuring sensor 33. When the measurement range is exceeded, the measuring device inside the measuring sensor 33 sends an interrupt signal to the alarm device, and the alarm device inside the measuring sensor 33 immediately sends a power-off instruction to the central information processor and a valve closing instruction to the central information processor. One end of the worm 12 is fixedly connected to the first gear 11, and the other end is provided with a plurality of pairs of disc springs 34. The disc springs 34 are used to buffer the movement of the worm 12 to prevent the force generated by the sudden movement of the worm 12 from damaging the weak parts inside the electric actuator.

[0039] The utility model discloses a working principle: first, according to the demand first gear shift to variable speed assembly 20, display component 50, and variable speed assembly 20, display component 50 must be in the same gear position;The gear shift is to take variable speed lever 29 upwards or press down, the lowest is slow gear, the middle is medium speed gear, the uppermost is fast gear, and the higher gear position is closed or the valve opens the speed faster. Then start electric actuator, the first gear 11 being set in the first gear 11 of electric actuator is engaged rotation of the external motor gear, the first gear 11 is coaxial with worm 12, and worm 12 is engaged with worm wheel 14, and the second gear 15 is equipped on transmission rod 13, the second gear 15 is engaged with the emergency stop gear 24 in emergency stop component 22, the emergency stop gear 24 is engaged with variable speed gear set 21 again, and the second gear 15 on transmission rod 13 is also engaged with third gear 51, and third gear 51 is also engaged with display gear set 52, and the output end of display gear set 52 is installed display block 53, display block 53 is installed display sheet one 55, and display sheet two 56 is static on display sheet one 55, and display sheet one 55 rotates with display block 53, and the rotational speed of display block 53 is consistent with the valve switch rotational speed;The speed of valve switch is known through the rotational speed of display sheet one 55, and the opening size of valve is also known from the deflection angle between display sheet one 55 and display sheet two 56. If the abnormal condition appears in variable speed gear set 21, directly press emergency stop button 27, and the power transmission to variable speed gear set 21 can be interrupted to protect the weak parts in electric actuator. The output shaft of external motor passes through first gear 11 and transmits power to worm 12 shaft, but the rotational speed of external motor output shaft is very high, and the rotational speed of worm 12 shaft is also very high, when the rotational speed of worm 12 shaft is too high and the axial force of worm 12 itself acts, will move in electric actuator interior;The one end of overspeed measuring rod 31 is clamped in the two spiral blocks on worm 12, and the other end is fixedly connected with the one end of overspeed measuring sheet 32, and the other end of overspeed measuring sheet 32 is slidably connected in measuring sensor 33, if worm 12 moves in the interior, measuring sensor 33 will give an alarm, then electric actuator stops immediately, and the valve controlled closes immediately.

[0040] The above only for the preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled in the art person in the utility model disclosed technical range, according to the utility model technical scheme and the utility model concept of the utility model are equivalent to replace or change, all should be covered in the protection scope of the utility model.

Claims

1. An electric actuator with variable speed, display and over speed protection, characterized in that, The power assembly (10), the display assembly (50), the gear shifting assembly (20), and the overspeed protection assembly (30); The power assembly (10) is arranged between the display assembly (50) and the gear shifting assembly (20), and drives the display assembly (50) and the gear shifting assembly (20) respectively; the overspeed protection assembly (30) is arranged above the power assembly (10); The power assembly (10) comprises a first gear (11) and a second gear (15), wherein the first gear (11) is an input end of the power assembly (10) and is engaged with an external motor gear, and the second gear (15) is an output end of the power assembly; The gear shifting assembly (20) comprises an emergency stop assembly (22) and a gear shifting gear set (21), wherein the emergency stop assembly (22) is arranged between the gear shifting gear set (21) and the second gear (15); The emergency stop assembly (22) comprises an emergency stop gear (24), which is engaged with or disengaged from the second gear (15) and the input gear of the gear shifting gear set (21) respectively; The gear shifting assembly (20) further comprises a start-stop sensor (211) for sending an opening or closing signal to a central information processor, which is arranged on one side of the gear shifting gear set (21) and is in sliding connection with an output end of the gear shifting gear set (21); The display assembly (50) comprises a display disc (54) and a display gear set (52), which is directly engaged with the second gear (15) or has an idle gear arranged between the display gear set (52) and the second gear (15); The display disc (54) is arranged above the display gear set (52), at least one display sheet or one display pointer is arranged on the display disc (54), and the deflection angle of the display pointer or the display sheet on the display disc (54) corresponds to the opening degree of the valve; The overspeed protection assembly (30) comprises an overspeed measuring rod (31), an overspeed measuring sheet (32), and a measuring sensor (33), one end of the overspeed measuring rod (31) is clamped in two spiral blocks on the worm (12), and the axis of the overspeed measuring rod (31) is perpendicular to the axis of the worm (12); The other end of the overspeed measuring rod (31) is fixedly connected with one end of the overspeed measuring sheet (32), and an included angle greater than 0° and less than 180° is arranged between the overspeed measuring rod (31) and the overspeed measuring sheet (32); The measuring sensor (33) is arranged on the housing (40) and located on one side of the overspeed measuring rod (31); The other end of the overspeed measuring sheet (32) is in sliding connection with the measuring sensor (33).

2. The electric actuator with variable speed, display and over speed protection function according to claim 1, characterized in that, The housing (40) is further arranged on the power assembly (10), the display assembly (50), the gear shifting assembly (20), and the overspeed protection assembly (30); The power assembly (10) comprises a worm (12), a worm gear (14), and a transmission rod (13), the first gear (11) is arranged at one end of the worm and has an axis parallel to the axis of the worm, and the worm (12) is rotatably arranged on the housing (40). The worm wheel (14) is arranged at the end of the transmission rod (13) and the axis is parallel to the axis of the transmission rod (13), the worm wheel (14) is engaged with the worm (12), and the worm wheel axis is perpendicular to the worm axis; The transmission rod (13) is rotatably arranged on the shell (40), and the axis of the transmission rod (13) is perpendicular to the axis of the worm (12); The second gear (15) is sleeved on the transmission rod (13), the axis of the second gear (15) is parallel to the axis of the transmission rod (13), and the second gear (15) is arranged on one side of the worm wheel (14).

3. The electric actuator with variable speed, display and over speed protection function according to claim 1, characterized in that, The emergency stop assembly (22) comprises an emergency stop assembly support shaft (23), a spring (25), a spring support plate (26), an emergency stop button (27), and a connecting block (28); The emergency stop assembly support shaft (23) is vertically rotatably arranged on the shell (40), the spring support plate (26) is arranged on the emergency stop assembly support shaft (23), and one end of the spring (25) is fixedly arranged on the spring support plate (26); The emergency stop gear (24) is slidably connected to the emergency stop assembly support shaft (23), and the axis of the emergency stop gear (24) is parallel to the axis of the emergency stop assembly support shaft (23); The other end of the spring (25) is fixedly arranged on one side of the emergency stop gear (24); The connecting block (28) is fixedly connected to the other side of the emergency stop gear (24); The emergency stop button (27) is arranged on one side of the emergency stop gear, and the lower end of the emergency stop button (27) is rotatably connected to the connecting block (28).

4. The electric actuator with variable speed, display and over speed protection function according to claim 1, characterized in that, The variable speed assembly (20) further comprises a toggle block (210), which is fixedly arranged on the output gear of the variable speed gear set (21), and the end of the toggle block (210) is provided with a cam.

5. The electric actuator with variable speed, display and over speed protection according to claim 1 or 4, characterized in that, The start-stop sensor (211) comprises a push block (212) fixedly connected or slidably connected to the start-stop sensor (211); The cam on the toggle block (210) is slidably connected or disconnected with the push block (212).

6. The electric actuator with variable speed, display and over speed protection according to claim 1, characterized in that, The display assembly (50) comprises a display block (53), one end of which is fixedly connected to the output gear of the display gear set (52), and the other end of the display block (53) is provided with a display disc (54); The display sheet or display pointer is fixedly connected or movably connected to the display disc (54).

7. The electric actuator with variable speed, display and over speed protection according to claim 1, characterized in that, The wiring terminal is further connected to the wiring terminal (43) fixedly connected to the shell (40); The lead of the start-stop sensor (211) is connected to the wiring terminal (43); The lead of the measurement sensor (33) is connected to the wiring terminal (43); The lead of the central information processor is further connected to the wiring terminal (43).

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