Electric actuator electric state self-recovery mechanism

Abstract

The utility model relates to the technical field of electric actuating mechanisms of valves, in particular to an electric state self-recovery mechanism of an electric actuator, which comprises a casing, a worm and gear mechanism, a spline shaft, an electric mechanism and a manual mechanism, and the worm and gear mechanism, the spline shaft, the electric mechanism and the manual mechanism are arranged in the casing. The middle of the spline shaft is connected with the worm and gear mechanism, the automatic disengaging mechanism, the manual disengaging mechanism and the mandrel are arranged in the shell, the output end of the electric mechanism is connected with the left end of the spline shaft through the automatic disengaging mechanism, the manual disengaging mechanism is arranged in the manual mechanism, and the mandrel penetrates through the spline shaft in a sliding mode. The automatic separation mechanism is connected with the manual separation mechanism through a mandrel; the automatic switching device is simple in structural design, and a manual state can be automatically switched into an electric state when the automatic switching device is powered on.

Description

Technical Field

[0001] The utility model relates to the technical field of electric actuators for valves, in particular to an electric state self-recovery mechanism for an electric actuator. Background Art

[0002] Electric actuators are very important field drive devices in industrial automatic control systems. They are characterized by convenient energy access and simple installation and commissioning. They are widely used in machinery, electric power, metallurgy, petrochemicals, chemicals, food, medicine, packaging, building materials, water treatment and other industries.

[0003] The traditional electric actuator has complicated operation steps when switching between electric state and manual state, resulting in poor practicality, and it is impossible to automatically switch from manual state to electric state when power is turned on. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide an electric state self-recovery mechanism for an electric actuator which has a simple structural design and can automatically switch a manual state to an electric state when powered on.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an electric state self-recovery mechanism of an electric actuator, including a shell and a worm gear mechanism, a spline shaft, an electric mechanism and a manual mechanism arranged in the shell, the spline shaft is arranged horizontally and is rotatably connected to the shell, the middle part of the spline shaft is connected to the worm gear mechanism, and also includes an automatic disengagement mechanism, a manual disengagement mechanism and a core shaft arranged in the shell, the output end of the electric mechanism is connected to the left end of the spline shaft through the automatic disengagement mechanism, the manual disengagement mechanism is arranged in the manual mechanism, the core shaft is slidably penetrated in the spline shaft, and the automatic disengagement mechanism is connected to the manual disengagement mechanism through the core shaft.

[0006] Furthermore, the automatic disengagement mechanism includes a support, a spline seat, a disengager, a latch, a connector, an automatic compression spring and an automatic leaf spring. The support is installed in a shell, the left end of the spline seat is rotatably connected to the support, and the right end of the spline seat is sleeved on the left end of the spline shaft, the disengager is sleeved on the right part of the spline seat and connected to the spline seat through the latch, the right part of the spline seat is provided with an axial hole, the latch passes through the axial hole and slides with the axial hole, the latch contacts the left end of the core shaft, the connector is sleeved on the left end of the spline shaft and corresponds to the disengager, the automatic compression spring is sleeved on the middle part of the spline seat, the left end of the automatic compression spring contacts the annular ridge on the left part of the spline seat, and the right end contacts the left end of the disengager, the left end of the automatic leaf spring is sleeved on the right end of the disengager, and the right end is connected to the pressure plate at the left end of the spline shaft.

[0007] Furthermore, the spline seat and the disconnector are both hollow cylindrical structures.

[0008] Furthermore, the disconnector includes a connecting section, a transition section and a disconnecting section, the connecting section is connected to the disconnecting section through the transition section, the connecting section is provided with a pin hole for the pin to pass through, the transition section is an inclined surface, and the disconnecting section is symmetrically formed with steps at the upper and lower ends away from the end face of the connecting section.

[0009] Furthermore, the step is crescent-shaped.

[0010] Furthermore, the manual mechanism includes a manual shaft, a handwheel and a planetary gear assembly. The manual shaft is arranged horizontally and is rotatably connected to the shell. The left end of the manual shaft is connected to the manual disengagement mechanism through the planetary gear assembly, and the right end extends out of the shell and is connected to the handwheel.

[0011] Furthermore, the planetary gear assembly includes an inner ring gear, planetary gears and a sun gear, the inner ring gear is mounted on a pressure plate at the right end of the spline shaft, the planetary gears are rotatably mounted on the left end of the manual shaft and mesh with the inner ring gear, and the sun gear is arranged at the left end center of the manual shaft and mounted on the left end of the manual disengagement mechanism.

[0012] Furthermore, the manual disengagement mechanism includes a pin shaft, a manual compression spring, a pressure ring, a first retaining spring and a second retaining spring. The pin shaft is slidably inserted into the manual shaft, the manual compression spring is sleeved on the left part of the pin shaft, the pressure plate is installed in the middle of the inner ring of the sun gear, the pressure ring is slidably sleeved on the right end of the core shaft and abuts against the left end of the manual compression spring, the first retaining spring is installed in the middle of the pin shaft and abuts against the right end of the manual compression spring, and the second retaining spring is installed at the right end of the core shaft and is located on the left side of the pressure ring.

[0013] The beneficial effects of the utility model are:

[0014] (1) The utility model is provided with an automatic disengagement mechanism, a manual disengagement mechanism and a core shaft. When it is necessary to switch to the electric state, the electric mechanism drives the disengager to rotate. When the left end of the automatic leaf spring is separated from the step, the automatic compression spring pushes the disengager to move right until the disengager is connected to the connector. At the same time, the latch pushes the sun gear to move right through the core shaft, so that the sun gear and the planetary gear are not meshed, thereby realizing the switching between the electric state and the manual state. In addition, the manual state can be automatically switched to the electric state in the electric state, which is easy to operate.

[0015] (2) The utility model achieves the effect of increasing speed and reducing torque by setting a planetary gear assembly, thereby increasing the speed of the valve switch when operated manually and preventing the valve from being damaged by excessive torque on the hand wheel when operated manually. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0019] Figure 3 yes Figure 1 Enlarged view of middle part B;

[0020] Figure 4 It is a schematic diagram of the spline seat in the utility model;

[0021] Figure 5 It is a schematic diagram of the disconnector in the utility model;

[0022] Figure 6 yes Figure 2 Cross-sectional view along the DD direction;

[0023] Figure 7 yes Figure 3 Sectional view along CC direction.

[0024] In the figure: 100, housing; 200, worm gear mechanism; 300, spline shaft; 400, electric mechanism; 500, manual mechanism; 510, manual shaft; 520, hand wheel; 530, planetary gear assembly; 531, inner ring gear; 532, planetary gear; 533, sun gear; 600, automatic disengagement mechanism; 610, support; 620, spline seat; 621, axial hole; 622, annular ridge; 63 0. Disengager; 631. Connecting section; 6311. Pin hole; 632. Transition section; 633. Disengagement section; 6331. Step; 640. Latch; 650. Connector; 660. Automatic compression spring; 670. Automatic leaf spring; 700. Manual disengagement mechanism; 710. Pin shaft; 720. Manual compression spring; 730. Pressing ring; 740. First retaining spring; 750. Second retaining spring; 800. Mandrel; 900. Pressing plate. DETAILED DESCRIPTION

[0025] The present invention is now further described in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0026] like Figure 1-Figure 3As shown, an electric state self-recovery mechanism of an electric actuator includes a housing 100 and a worm gear mechanism 200, a spline shaft 300, an electric mechanism 400 and a manual mechanism 500 arranged in the housing 100. The spline shaft 300 is arranged horizontally and is rotatably connected to the housing 100. The middle part of the spline shaft 300 is connected to the worm gear mechanism 200. It also includes an automatic disengagement mechanism 600, a manual disengagement mechanism 700 and a core shaft 800 arranged in the housing 100. The output end of the electric mechanism 400 is connected to the left end of the spline shaft 300 through the automatic disengagement mechanism 600, the manual disengagement mechanism 700 is arranged in the manual mechanism 500, the core shaft 800 is slidably penetrated in the spline shaft 300, and the automatic disengagement mechanism 600 is connected to the manual disengagement mechanism 700 through the core shaft 800. Through the coordinated arrangement of the automatic disengagement mechanism 600, the manual disengagement mechanism 700 and the mandrel 800, when it is necessary to switch to the electric state, the electric mechanism 400 drives the disengagement device 630 to rotate, and when the left end of the automatic leaf spring 670 is disengaged from the step 6331, the automatic compression spring 660 pushes the disengagement device 630 to move right until the disengagement device 630 is connected to the connector 650, and at the same time, the latch 640 pushes the sun gear 533 to move right through the mandrel 800, so that the sun gear 533 is not meshed with the planetary gear 532, thereby realizing the switching between the electric state and the manual state, and realizing that the manual state can be automatically switched to the electric state in the electric state, which is easy to operate. Specifically, the worm gear mechanism 200 and the electric mechanism 400 are both prior art and will not be described in detail here.

[0027] like Figure 2 and Figure 4 As shown, the automatic disengagement mechanism 600 includes a support 610, a spline seat 620, a disengager 630, a latch 640, a connector 650, an automatic compression spring 660 and an automatic leaf spring 670. The support 610 is installed in the housing 100. The left end of the spline seat 620 is rotatably connected to the support 610, and its right end is sleeved on the left end of the spline shaft 300. The disengager 630 is sleeved on the right part of the spline seat 620 and is connected to the spline seat 620 through the latch 640. The right part of the spline seat 620 is provided with an axial hole 621, and the latch 640 passes through The axial hole 621 is slidably matched with the axial hole 621, the latch 640 contacts the left end of the core shaft 800, the connector 650 is sleeved on the left end of the spline shaft 300, and corresponds to the disconnector 630, the automatic compression spring 660 is sleeved on the middle part of the spline seat 620, the left end of the automatic compression spring 660 contacts the annular ridge 622 on the left part of the spline seat 620, and its right end contacts the left end of the disconnector 630, the left end of the automatic leaf spring 670 is arranged at the right end of the disconnector 630, and its right end is connected to the pressure plate 900 at the left end of the spline shaft 300. Specifically, the spline seat 620 and the disconnector 630 are both hollow cylindrical structures; the latch 640 is elastic.

[0028] like Figure 2 and Figure 5 As shown, the disconnector 630 includes a connecting section 631, a transition section 632 and a disconnecting section 633. The connecting section 631 is connected to the disconnecting section 633 through the transition section 632. The connecting section 631 is provided with a pin hole 6311 for the latch 640 to pass through. The transition section 632 is inclined. Steps 6331 are symmetrically formed at the upper and lower ends of the disconnecting section 633 away from the end surface of the connecting section 631. Specifically, the step 6331 is crescent-shaped.

[0029] like Figure 1 and Figure 3 As shown, the manual mechanism 500 includes a manual shaft 510, a handwheel 520 and a planetary gear assembly 530. The manual shaft 510 is arranged horizontally and is rotatably connected to the housing 100. The left end of the manual shaft 510 is connected to the manual disengagement mechanism 700 through the planetary gear assembly 530, and the right end thereof extends out of the housing 100 and is connected to the handwheel 520. The arrangement of the planetary gear assembly 530 plays a role in increasing speed and reducing torque, thereby increasing the speed of the valve switch when operated manually, and preventing the valve from being damaged due to excessive torque on the handwheel 520 when operated manually.

[0030] like Figure 3 and Figure 7 As shown, the planetary gear assembly 530 includes an inner gear ring 531, planetary gears 532 and a sun gear 533. The inner gear ring 531 is mounted on the pressure plate 900 at the right end of the spline shaft 300. The planetary gear 532 is rotatably mounted on the left end of the manual shaft 510 and meshes with the inner gear ring 531. The sun gear 533 is arranged at the center of the left end of the manual shaft 510 and is installed at the left end of the manual disengagement mechanism 700. Specifically, there are three planetary gears 532, which are arranged circumferentially around the sun gear 533; the left part of the inner ring of the sun gear 533 is provided with internal teeth.

[0031] like Figure 3 As shown, the manual disengagement mechanism 700 includes a pin shaft 710, a manual compression spring 720, a pressure ring 730, a first retaining spring 740 and a second retaining spring 750. The pin shaft 710 is slidably inserted into the manual shaft 510, the manual compression spring 720 is sleeved on the left part of the pin shaft 710, the pressure ring 730 is installed in the middle part of the inner ring of the sun gear 533, the pressure ring 730 is slidably sleeved on the right end of the core shaft 800, and contacts with the left end of the manual compression spring 720, the first retaining spring 740 is installed in the middle part of the pin shaft 710, and contacts with the right end of the manual compression spring 720, and the second retaining spring 750 is installed at the right end of the core shaft 800 and is located on the left side of the pressure ring 730.

[0032] In the electric state, the disconnector 630 is connected to the connector 650, and the left end of the automatic leaf spring 670 is in the connecting section 631, that is, Figure 6In the middle H-surface region, the outer teeth of the sun gear 533 do not mesh with the planetary gear 532, and the inner teeth of the sun gear 533 do not mesh with the spline at the right end of the spline shaft 300. When opening and closing the valve, the motor (involute) shaft end in the electric mechanism 400 drives the spline seat 620 to rotate, and the rotation of the spline seat 620 drives the disconnector 630 to rotate through the latch 640. The engagement of the disconnector 630 with the connector 650 drives the spline shaft 300 to rotate. Since the spline shaft 300 is connected to the involute spline of the worm sleeve, it drives the output shaft of the worm gear mechanism 200 to rotate, thereby realizing that the output shaft drives the valve to open and close.

[0033] When the power is cut off in the electric state, in order to open and close the valve, it is necessary to switch to the manual state. At this time, the E-direction force F is applied to the pin shaft 710, and the pin shaft 710 moves left to compress the manual compression spring 720. The manual compression spring 720 pushes the compression ring 730 and then drives the sun gear 533 to move left, until the outer teeth of the sun gear 533 mesh with the outer teeth of the planetary gear 532, and the inner teeth of the sun gear 533 mesh with the inner spline of the right end of the spline shaft 300. The leftward movement of the pin shaft 710 simultaneously pushes the core shaft 800 to move left, and then drives the disconnector 630 to move left through the latch 640, so that the disconnector 630 is disengaged from the connector 650, until the left end of the automatic leaf spring 670 rests on the step 6331 of the disengagement section 633, that is, Figure 6 When opening and closing the valve, the hand wheel 520 is rotated to drive the manual shaft 510 to rotate, and the rotation of the manual shaft 510 drives the spline shaft 300 to rotate through the planetary gear 532 and the sun gear 533, and then drives the output shaft of the worm gear mechanism 200 to rotate, so that the output shaft drives the valve to open and close.

[0034] When power is turned on in the manual state, the motor (involute) shaft end in the electric mechanism 400 drives the spline seat 620 to rotate, and then drives the disconnector 630 to rotate, and the left end of the automatic leaf spring 670 moves circumferentially on the step 6331 of the disengagement section 633 until the left end of the automatic leaf spring 670 contacts the H-surface area of ​​the disconnector 630. At this time, the axial direction of the disconnector 630 is not blocked by the automatic leaf spring 670. The disconnector 630 moves to the right under the action of the automatic compression spring 660 until it engages with the connector 650. At the same time, the pin 640 pushes the core shaft 800 to the right along the axial hole 621, and the second retaining spring 750 on the core shaft 800 synchronously drives the pressure ring 730 to move right, thereby driving the sun gear 533 to move right until the outer teeth of the sun gear 533 are no longer engaged with the planetary gear 532, and the inner teeth of the sun gear 533 are no longer engaged with the spline at the right end of the spline shaft 300, thereby automatically switching to the electric state.

[0035] The above-mentioned implementation mode is only for illustrating the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An electric state self-restoring mechanism of an electric actuator, comprising a housing (100) and a worm gear mechanism (200) arranged in the housing (100), a spline shaft (300), an electric mechanism (400) and a manual mechanism (500), wherein the spline shaft (300) is arranged transversely and is rotatably connected to the housing (100), and the middle part of the spline shaft (300) is connected to the worm gear mechanism (200), characterized in that: It also includes an automatic disengagement mechanism (600), a manual disengagement mechanism (700) and a spindle (800) which are arranged inside the housing (100); the output end of the electric mechanism (400) is connected to the left end of the spline shaft (300) through the automatic disengagement mechanism (600); the manual disengagement mechanism (700) is arranged inside the manual mechanism (500); the spindle (800) is slidably arranged on the spline shaft (300); and the automatic disengagement mechanism (600) is connected to the manual disengagement mechanism (700) through the spindle (800); The automatic disengagement mechanism (600) comprises a support (610), a spline seat (620), a disengager (630), a latch (640), a connector (650), an automatic compression spring (660) and an automatic leaf spring (670). The support (610) is installed in the housing (100). The left end of the spline seat (620) is rotatably connected to the support (610), and the right end of the spline seat (620) is sleeved on the left end of the spline shaft (300). The disengager (630) is sleeved on the right part of the spline seat (620) and connected to the spline seat (620) via the latch (640). The right part of the spline seat (620) is provided with an axial hole (621). The latch (640) Passing through the axial hole (621) and slidingly cooperating with the axial hole (621), the latch (640) abuts against the left end of the core shaft (800), the connector (650) is sleeved on the left end of the spline shaft (300) and corresponds to the disconnector (630), the automatic compression spring (660) is sleeved on the middle part of the spline seat (620), the left end of the automatic compression spring (660) abuts against the annular ridge (622) on the left part of the spline seat (620), and its right end abuts against the left end of the disconnector (630), the left end of the automatic leaf spring (670) is arranged at the right end of the disconnector (630), and its right end is connected to the pressure plate (900) at the left end of the spline shaft (300); The manual mechanism (500) comprises a manual shaft (510), a hand wheel (520) and a planetary gear assembly (530); the manual shaft (510) is arranged transversely and is rotationally connected to the housing (100); the left end of the manual shaft (510) is connected to the manual disengagement mechanism (700) through the planetary gear assembly (530), and the right end of the manual shaft (510) extends out of the housing (100) and is connected to the hand wheel (520).

2. The electric state self-recovery mechanism of the electric actuator according to claim 1, characterized in that: The spline seat (620) and the disconnector (630) are both hollow cylindrical structures.

3. The electric state self-recovery mechanism of the electric actuator according to claim 1 or 2, characterized in that: The disconnector (630) comprises a connecting section (631), a transition section (632) and a disconnecting section (633); the connecting section (631) is connected to the disconnecting section (633) via the transition section (632); a pin hole (6311) for a latch (640) to pass through is provided on the connecting section (631); the transition section (632) is an inclined surface; steps (6331) are symmetrically formed at the upper and lower ends of the disconnecting section (633) away from the end surface of the connecting section (631).

4. The electric state self-recovery mechanism of the electric actuator according to claim 3, characterized in that: The step (6331) is crescent-shaped.

5. The electric state self-restoring mechanism of the electric actuator according to claim 1, characterized in that: The planetary gear assembly (530) includes an inner ring gear (531), a planetary gear (532) and a sun gear (533); the inner ring gear (531) is mounted on a pressure plate (900) at the right end of the spline shaft (300); the planetary gear (532) is rotatably mounted on the left end of the manual shaft (510) and meshes with the inner ring gear (531); the sun gear (533) is arranged at the left end center of the manual shaft (510) and is mounted on the left end of the manual disengagement mechanism (700).

6. The electric state self-recovery mechanism of the electric actuator according to claim 5, characterized in that: The manual disengagement mechanism (700) includes a pin shaft (710), a manual compression spring (720), a pressure ring (730), a first retaining spring (740) and a second retaining spring (750). The pin shaft (710) is slidably inserted into the manual shaft (510). The manual compression spring (720) is sleeved on the left part of the pin shaft (710). The pressure ring (730) is installed in the middle part of the inner ring of the sun gear (533). The pressure ring (730) is slidably sleeved on the right end of the core shaft (800) and contacts the left end of the manual compression spring (720). The first retaining spring (740) is installed in the middle part of the pin shaft (710) and contacts the right end of the manual compression spring (720). The second retaining spring (750) is installed at the right end of the core shaft (800) and is located on the left side of the pressure ring (730).

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