A limit mechanism for an electric control device for a multi-turn valve

Abstract

The present invention provides a limiting mechanism for a multi-turn stroke valve electric control device, comprising a driving wheel and a driven gear arranged coaxially, a convex tooth segment extending radially outwardly from a portion of the edge of the driving wheel, a linkage gear being provided on one side of the driving wheel, the linkage gear being meshed with the convex tooth segment of the driving wheel and the driven gear at the same time, a cam being provided on the driven gear, the cam and the driven wheel rotating synchronously, and the rotating part and the driven gear moving synchronously, a touch switch being provided on one side of the cam, when the cam rotates, the convex part can touch the touch switch. The present invention adopts a method of providing a convex tooth segment on the driving wheel, intermittently driving the driven gear to rotate through the linkage gear, thereby driving the cam to rotate, so that when the driving wheel rotates multiple times, the linkage gear and the driven gear driven by the convex tooth segment can rotate to a certain angle, so that the cam touches the touch switch, and then the touch switch is used to cut off the power supply of the motor of the electric actuator, thereby protecting the valve.

Description

Technical Field

[0001] The invention belongs to the technical field of valve control, and in particular relates to a multi-turn travel limiting mechanism. Background Art

[0002] In order to facilitate the control of the opening and closing of the valve, electric actuators are usually installed on the valve to perform electric control on the valve. The electric actuators currently used on valves are usually divided into two structural drive modes: multi-turn and part-turn. Multi-turn electric actuators are usually used for gate valves, knife gate valves and other valves that require multi-turn operations to change the switch state, while part-turn electric actuators are usually used for butterfly valves, ball valves and other valves that require 90-degree rotation operations to change the switch state.

[0003] In order to control the extreme switch position of the valve, the existing multi-turn valve usually limits the working time or the number of working turns of the motor, but does not rigidly limit the operation of the electric actuator. As a result, in some specific environments (such as high temperature or low temperature), the controller of the electric actuator is prone to damage, resulting in the inability to cut off the power to the motor. Excessive number of turns can easily cause damage to the valve, resulting in valve failure and production accidents. Summary of the invention

[0004] In view of this, the present invention aims to provide a limiting mechanism for a multi-turn valve electric control device to limit the multi-turn electric actuator and prevent the electric actuator from rotating excessively.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A limiting mechanism of a multi-turn valve electric control device comprises a coaxially arranged driving wheel and a driven gear, wherein a convex tooth segment extends radially outward from a portion of the edge of the driving wheel, a linkage gear is provided on one side of the driving wheel, the lower portion of the linkage gear meshes with the convex tooth segment of the driving wheel, and the upper portion meshes with the driven gear, a cam is arranged on the driven gear, the cam comprises a rotating portion and a protruding portion, the rotating portion is coaxially connected to the driven gear, and the rotating portion and the driven gear move synchronously, a touch switch is provided on one side of the cam, and when the cam rotates, the protruding portion can touch the touch switch.

[0007] Furthermore, the driving wheel disc also includes an idling section, the convex tooth section and the idling section are combined into a circle, and the side wall of the idling section is a smooth surface.

[0008] Furthermore, a rotating sleeve is extended upward from the axis of the driven gear, a through hole is opened on the rotating part of the cam, and the rotating part is sleeved on the rotating sleeve through the through hole.

[0009] Furthermore, a first screw hole is formed on the side wall of the rotating part, a first top screw is screwed to the first screw hole, and an end of the first top screw can abut against the outer wall of the rotating sleeve.

[0010] Furthermore, the position limiting mechanism further comprises a travel shaft, a fixed sleeve extends upward from the middle of the driving wheel, and the fixed sleeve is sleeved on the travel shaft.

[0011] Furthermore, a second screw hole is opened on the side wall of the fixed sleeve, a second top screw is screwed to the second screw hole, and the second top screw can push against the stroke shaft.

[0012] Furthermore, the driven gear is rotatably sleeved on the stroke shaft, and the lower surface of the driven gear wheel piece abuts against the upper end surface of the fixed sleeve.

[0013] Furthermore, the limiting mechanism also includes a linkage shaft, and the linkage gear is sleeved on the linkage shaft.

[0014] Furthermore, the linkage shaft is arranged in parallel with the stroke shaft.

[0015] Compared with the prior art, the limiting mechanism of the multi-turn stroke valve electric control device described in the present invention has the following advantages:

[0016] The present invention adopts a method of arranging a convex tooth segment on the driving wheel disc, intermittently driving the driven gear to rotate through the linkage gear, thereby driving the cam to rotate, so that when the driving wheel disc rotates multiple circles, the linkage gear and the driven gear driven by the convex tooth segment can rotate a certain angle, so that the cam touches the touch switch, and then the touch switch is used to cut off the power supply of the motor of the electric actuator, thereby protecting the electric actuator and the valve;

[0017] The first top screw is used to fix the cam and the driven gear, and the second top screw is used to fix the driving wheel and the stroke shaft, so that the position of the driving wheel and the cam can be disassembled and adjusted at any time during the installation process to ensure that the cam and the touch switch have a limit and protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a cross-sectional schematic diagram of the limiting mechanism;

[0020] Figure 2 It is a three-dimensional schematic diagram of the overall structure of the limiting mechanism;

[0021] Figure 3 for Figure 2 Explosion diagram.

[0022] Description of reference numerals:

[0023] 1-stroke shaft; 11-driving wheel; 112-idling section; 113-convex tooth section; 114-fixed sleeve; 115-second screw hole; 116-second top screw; 12-driven gear; 121-rotating sleeve; 13-cam; 131-rotating part; 132-first screw hole; 134-convex part; 135-first top screw; 2-linkage shaft; 21-linkage gear; 3-touch switch. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] The limiting mechanism of the multi-turn stroke valve electric control device described in the present invention includes a stroke shaft 1 and a linkage shaft 2. A driving wheel disc 11 and a driven gear 12 are arranged on the stroke shaft 1 from bottom to top, and the driving wheel disc 11 rotates synchronously with the stroke shaft 1. The driven gear 12 can rotate relative to the stroke shaft 1. A linkage gear 21 is sleeved on the linkage shaft 2. A convex tooth segment 113 extends radially outward from a portion of the edge of the driving wheel disc 11. Specifically, the driving wheel disc 11 includes an idler segment 112. The convex tooth segment 113 and the idler segment 112 are combined into a circular shape. The side wall of the idler segment 112 is a smooth surface. The lower part of the linkage gear 21 is meshed with the convex tooth segment 113 of the driving wheel disc 11, and the upper part is meshed with the driven gear 12. A cam 13 is arranged on the driven gear 12. The cam 13 includes a rotating portion 131 and a protruding portion 134. The rotating portion 131 is coaxially connected to the driven gear 12, and the rotating portion 131 and the driven gear 12 move synchronously. A touch switch 3 is provided on one side of the cam 13. When the cam 13 rotates, the protruding portion 134 can touch the touch switch 3. The touch switch 3 can control the switch of the motor of the electric actuator. During operation, the stroke shaft 1 is coaxially connected to the valve stem of the valve, and the motor of the electric actuator drives the valve stem to rotate through the stroke shaft 1. At the same time, due to the gear linkage, the cam 13 rotates. When the protruding portion 134 touches the touch switch 3, it is determined that the valve stem of the valve has moved to the limit position. At this time, the touch switch 3 cuts off the power supply of the motor and stops the motor from working to protect the valve stem from being excessively rotated.

[0029] In order to facilitate the positioning of the cam 13 during the installation of the electric actuator, a fixed sleeve 114 is extended upward from the middle of the driving wheel 11, and the fixed sleeve 114 is sleeved on the stroke shaft 1. A second screw hole 115 is opened on the side wall of the fixed sleeve 114, and a second top screw 116 is screwed with the second screw hole 115, and the second top screw 116 can push against the stroke shaft 1, and the driven gear 12 is rotatably sleeved on the stroke shaft 1, and the driven gear 12 is rotatably sleeved on the stroke shaft 1. The lower surface of the wheel of the moving gear 12 abuts against the upper end surface of the fixed sleeve 114, and the axis of the driven gear 12 extends upward to form a rotating sleeve 121. A through hole is formed on the rotating portion 131 of the cam 13, and the rotating portion 131 is sleeved on the rotating sleeve 121 through the through hole. A first screw hole 132 is formed on the side wall of the rotating portion 131, and a first top screw 135 is screwed with the first screw hole 132, and the end of the first top screw 135 can abut against the outer wall of the rotating sleeve 121.

[0030] The limiting mechanism of the multi-turn stroke valve electric control device described in the present invention, during the installation process, first open or close the valve to an extreme position, then rotate the cam 13 to a position where it can touch the touch switch 3, make the convex tooth section 113 of the driving wheel 11 mesh with the linkage gear 21, lock the second top screw 116, make the driven gear 12 mesh with the upper part of the linkage gear 21, lock the first top screw 135, and complete the installation; during the working process, the motor of the electric actuator drives the valve stem to rotate through the stroke shaft 1, and at the same time, due to the gear linkage, the cam 13 rotates, when the protrusion 134 touches the touch switch 3, it is determined that the valve stem of the valve has moved to the extreme position, at this time the touch switch 3 cuts off the motor power supply, and the motor stops working at this time. The structure of the electric actuator and how the touch switch controls the motor to cut off the power are both existing technologies and will not be repeated here.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A limit mechanism for a multi-turn valve electric control device, characterized in that: The invention comprises a driving wheel disc (11) and a driven gear (12) which are coaxially arranged. The edge of the driving wheel disc (11) is provided with a convex tooth segment (113). A linkage gear (21) is provided on one side of the driving wheel disc (11). The lower part of the linkage gear (21) meshes with the convex tooth segment (113) of the driving wheel disc (11), and the upper part meshes with the driven gear (12). A cam (13) is arranged on the driven gear (12). The cam (13) comprises a rotating part (131) and a protruding part (134). The rotating part (131) is coaxially connected with the driven gear (12), and the rotating part (131) and the driven gear (12) move synchronously. A touch switch (3) is provided on one side of the cam (13). When the cam (13) rotates, the protruding part (134) can touch the touch switch (3). The driving wheel also includes an idler section (112), the protruding tooth section (113) and the idler section (112) are combined into a circle, and the side wall of the idler section (112) is a smooth surface; The travel shaft, the driving wheel and the driven gear are arranged on the travel shaft, the driving wheel rotates synchronously with the travel shaft, and the driven gear can rotate relative to the travel shaft.

2. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 1, characterized in that: A rotating sleeve (121) extends upward from the axis of the driven gear (12), a through hole is formed on the rotating portion (131) of the cam (13), and the rotating portion (131) is sleeved on the rotating sleeve (121) through the through hole.

3. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 2, characterized in that: The side wall of the rotating part (131) is provided with a first screw hole (132), a first top screw (135) is threadedly connected to the first screw hole (132), and the end of the first top screw (135) can abut against the outer wall of the rotating sleeve (121).

4. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 1, characterized in that: A fixed sleeve (114) extends upward from the middle of the driving wheel (11), and the fixed sleeve (114) is sleeved on the travel shaft (1).

5. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 4, characterized in that: A second screw hole (115) is formed on the side wall of the fixing sleeve (114), and a second top screw (116) is threadedly connected to the second screw hole (115), and the second top screw (116) can abut against the stroke shaft (1).

6. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 5, characterized in that: The driven gear (12) is rotatably sleeved on the travel shaft (1), and the lower surface of the wheel piece of the driven gear (12) abuts against the upper end surface of the fixed sleeve (114).

7. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 4, characterized in that: It also comprises a linkage shaft (2), and the linkage gear (21) is sleeved on the linkage shaft (2).

8. The position limiting mechanism of the electric control device for a multi-turn valve according to claim 7, characterized in that: The linkage shaft (2) is arranged in parallel with the stroke shaft (1).

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