Switch type straight stroke electric actuating mechanism

Abstract

The invention discloses a switch type straight-stroke electric actuating mechanism. Relates to the technical field of electric actuating mechanisms. Comprising a shell and a push rod, and the push rod movably penetrates through the shell; the switch further comprises a fixing plate, a pair of symmetrically-arranged switch assemblies, a switcher and a copper nut, the fixing plate is connected to an upper cover plate of the shell, each switch assembly comprises a microswitch and a microswitch support, the microswitches are used for being connected to the microswitch supports, the microswitch supports and the switcher are arranged on the fixing plate, and the copper nut is connected to the microswitch supports. A switcher mounting boss is arranged on the fixing plate, the switcher is in a strip plate shape, a rear arm of the switcher is connected with the switcher mounting boss, and a front arm of the switcher is located between the pair of microswitches; the copper nut is connected to the push rod through threads, a copper nut limiting groove is formed in the copper nut, a limiting column is arranged in the middle of the switcher, and the limiting column is located in the copper nut limiting groove. The switch type straight stroke electric actuating mechanism is compact in structure, and the use safety of the switch type straight stroke electric actuating mechanism is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of electric actuators, and in particular to a switch type linear stroke electric actuator. Background Art

[0002] In the on-off type linear electric actuator, torque protection is an indispensable part of the electric actuator. When the on-off type linear electric actuator is running, excessive or insufficient thrust of the electric actuator will affect the normal operation of the valve and cause valve damage.

[0003] The existing torque protection structure is complex, prone to malfunction and loss of protection function, which reduces reliability. Summary of the invention

[0004] In view of the above problems, the present invention provides a switch type linear stroke electric actuator which has a simple structure, is convenient for processing and has reliable operation.

[0005] The technical solution of the present invention is: a switch type linear stroke electric actuator, comprising a housing and a push rod, wherein the push rod moves through the housing; It also includes a fixing plate, a pair of symmetrically arranged switch assemblies, a switch and copper nuts. The fixing plate is connected to the upper cover plate of the shell. The switch assembly includes a micro switch and a micro switch bracket, wherein the micro switch is used to be connected to the micro switch bracket. The micro switch bracket and the switch are respectively arranged on a fixed plate, the fixed plate is provided with a switch mounting boss, the switch is in the shape of a long strip, the rear arm of the switch is connected to the switch mounting boss, and the front arm is located between a pair of micro switches; The copper nut is connected to the push rod through a thread, a copper nut limiting groove is provided on the copper nut, a limiting column is provided in the middle of the switch, and the limiting column is located in the copper nut limiting groove.

[0006] The micro switch bracket is rectangular with one end open, and a pair of symmetrically arranged bracket forearms are provided at the opening of the micro switch bracket. The two sides of the opening of the micro switch bracket are bracket side enclosures, and the outer wall of the bracket side enclosure is provided with a bracket side wall, and the bracket side wall is used to connect the fixing plate. The micro switch bracket is located between a pair of bracket side enclosures and a bracket rear enclosure. The micro switch is connected between the rear periphery of the support and a pair of front arms of the support.

[0007] A pair of bracket front arms are respectively provided with a set screw 1, and a compression spring is provided on the set screw 1. A bracket position adjustment hole is provided in the middle of the rear enclosure of the bracket, and a set screw 2 is provided in the bracket position adjustment hole. The micro switch is located between the second set screw and a pair of compression springs.

[0008] An L-shaped bracket upper enclosure is provided above the bracket side enclosure, and a pair of bracket upper enclosures are used for covering the micro switch.

[0009] The micro switch comprises a switch body, wherein a switch button and a switch pressing sheet are arranged in the middle of the front end of the switch body. The forearm of the switch is used to contact the switch pressing piece, and the switch pressing piece is used to contact the switch button; The two ends of the front end of the switch body are switch front shoulders respectively, and the switch front shoulders are used to contact the compression spring, and the compression spring is located on one side of the switch compression piece.

[0010] The fixing plate is L-shaped.

[0011] During operation, the present invention provides a fixing plate on the upper cover plate, and a switch and a switch assembly are provided on the fixing plate. A limiting column is designed in the middle of the switch to nest the switch in the limiting groove of the copper nut. When the copper nut is subjected to thrust and thus moves, the copper nut drives the switch to swing. When the switch swings upward or downward, the forearm of the switch touches the switch pressing piece of the micro switch, and then touches the switch button, causing the micro switch to operate.

[0012] The invention has a compact structure and ensures the use safety of the switch type linear stroke electric actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the specific implementation or the prior art description. In the drawings, each part is not necessarily drawn according to the actual scale.

[0014] Figure 1 It is a structural schematic diagram of the present invention, Figure 2 It is the motion principle diagram of the present invention, Figure 3 This is a schematic diagram of the connection structure between the switch and the copper nut. Figure 4 This is a structural diagram of the micro switch bracket. Figure 5 It is a structural diagram of a micro switch. Figure 6 This is a schematic diagram of the switch structure. Figure 7 It is a structural diagram of the fixed plate. In the figure, 1 is the upper cover plate. 2 is a fixing plate, 21 is a switch mounting boss, 22 is a switch mounting threaded hole, 23 is a micro switch bracket mounting hole, 24 is a fixing plate mounting hole, and 25 is a fixing plate bottom periphery; 3 is a three-combination screw, 4 is a set screw, 5 is a compression spring, 6 is a micro switch bracket, 61 is a bracket front arm, 62 is a bracket front threaded hole, 63 is a bracket side arm, 64 is a bracket side hole, 65 is a bracket upper enclosure, 66 is a bracket side enclosure, 67 is a bracket rear enclosure, and 68 is a bracket position adjustment hole; 7 is a micro switch, 71 is a switch tail, 72 is a switch front shoulder, 73 is a switch button, and 74 is a switch pressing piece; 8 is the second set screw, 9 is the push rod, 10 is the copper nut, 11 is the second three-combination screw, 12 is a switch, 121 is a switch fixing hole, 122 is a limit column, and 123 is a forearm; 13 is a cross pan head screw. DETAILED DESCRIPTION

[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0017] 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 according to specific circumstances.

[0018] The present invention Figure 1-7 As shown, a switch type linear stroke electric actuator comprises a housing and a push rod 9, wherein the push rod moves through the housing; It also includes a fixing plate 2, a pair of symmetrically arranged switch components, a switch 12 and a copper nut 10. The fixing plate 2 is connected to the upper cover plate 1 of the housing. The switch assembly includes a micro switch 7 and a micro switch bracket 6. The micro switch is used to be connected to the micro switch bracket 6. The micro switch bracket 6 and the switch 12 are respectively arranged on the fixing plate, the fixing plate 2 is provided with a switch mounting boss 21, and the switch mounting boss 21 is provided with a switch mounting threaded hole 22. The switch 12 is in the shape of a long strip, the rear arm of the switch is connected to the switch mounting boss, and the front arm 123 is located between a pair of micro switches; in application, the rear arm of the switch is provided with a switch fixing hole 121, which corresponds to the switch mounting threaded hole 22, so as to facilitate connection through three combination screws 11; The copper nut 10 is connected to the push rod 9 by threading, and a copper nut limiting groove is provided on the copper nut. A limiting column 122 is provided in the middle of the switch 12, and the limiting column 122 is located in the copper nut limiting groove. In application, the push rod is connected to the valve.

[0019] During operation, the present invention provides a fixing plate on the upper cover plate, and a switch and a switch assembly are provided on the fixing plate. A limiting column is designed in the middle of the switch to nest the switch in the limiting groove of the copper nut. When the copper nut is subjected to thrust and thus moves, the copper nut drives the switch to swing. When the switch swings upward or downward, the forearm of the switch touches the switch pressing piece of the micro switch, and then touches the switch button, causing the micro switch to operate.

[0020] The present invention solves the problem of damage to the valve or the electric actuator due to excessive thrust of the switch type linear stroke electric actuator, ensures the safety of use of the switch type linear stroke electric actuator, has a simple structure, is easy to install and disassemble, occupies a small space, has a compact structure and is low in cost.

[0021] The micro switch bracket 6 is rectangular with one end open. A pair of symmetrically arranged bracket front arms 61 are provided at the opening of the micro switch bracket 6. The bracket front arms are provided with bracket front threaded holes 62 for connecting the set screws 4. The micro switch bracket is provided with bracket side enclosures 66 on both sides of the opening, and the outer wall of the bracket side enclosure is provided with a bracket side wall 63, and the bracket side wall is provided with a bracket side hole 64, which is used to correspond to the micro switch bracket mounting hole 23 on the fixing plate and is connected by three combination screws 3; The micro switch support 6 is provided with a bracket rear enclosure 67 between a pair of bracket side enclosures. The micro switch is connected between the bracket rear enclosure 67 and a pair of bracket front arms 61 .

[0022] The micro switch bracket is designed with a bracket front arm and a bracket rear enclosure, which is convenient for installing the micro switch; The bracket side wall on the bracket side periphery is convenient for connection with the fixing plate, so that disassembly and assembly are convenient.

[0023] A pair of bracket front arms are respectively provided with a set screw 4, and a compression spring 5 is provided on the set screw. A bracket position adjustment hole 68 is provided in the middle of the rear enclosure of the bracket, and a second set screw 8 is provided in the bracket position adjustment hole, and the second set screw is used to contact the switch tail 71 of the micro switch; The micro switch 7 is located between the second set screw and a pair of compression springs.

[0024] On the basis of the compression spring, the longitudinal position of the micro switch is adjusted by adjusting the set screw 2 to adapt to different working conditions.

[0025] An L-shaped bracket upper enclosure 65 is provided above the bracket side enclosure, and a pair of bracket upper enclosures are used to cover the micro switch.

[0026] The upper enclosure of the bracket is provided to cover the micro switch and ensure the connection reliability of the micro switch.

[0027] The micro switch 7 comprises a switch body, and a switch button 73 and a switch pressing piece 74 are arranged in the middle of the front end of the switch body. The forearm 123 of the switch is used to contact the switch pressing piece, and the switch pressing piece 74 is used to contact the switch button 73; The two ends of the front end of the switch body are switch front shoulders 72 respectively, and the switch front shoulders are used to contact the compression spring, and the compression spring is located on one side of the switch compression piece.

[0028] The micro switch includes a switch button and a switch pressure piece, which is convenient for the switch to touch the action; the front shoulder of the switch is used to contact the compression spring. At the same time, the compression spring is located on one side of the switch pressure piece to ensure the reliable action of the switch and the switch pressure piece.

[0029] The fixing plate 2 is L-shaped.

[0030] The fixing plate is provided with a bottom enclosure structure (ie, including a fixing plate bottom enclosure 25 ), and the fixing plate bottom enclosure 25 is provided with fixing plate mounting holes 24 for mounting the fixing plate on the upper cover plate by means of cross pan head screws 13 .

[0031] The torque protection mechanism designed on the switch type linear electric actuator can perfectly display the maximum limit thrust state of the linear electric actuator. The maximum thrust of the switch type linear electric actuator can be set according to the thrust of the valve by adjusting the position of the micro switch.

[0032] Regarding the contents disclosed in this case, there are a few points that need to be explained: (1) The drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design; (2) In the absence of conflict, the embodiments and features of the embodiments disclosed in this case may be combined with each other to obtain new embodiments; The above are only specific implementation methods disclosed in this case, but the protection scope of the present disclosure is not limited thereto. The protection scope disclosed in this case should be based on the protection scope of the claims.

Claims

1. A switch type linear electric actuator, comprising a housing and a push rod, wherein the push rod moves through the housing; It is characterized in that It also includes a fixing plate, a pair of symmetrically arranged switch assemblies, a switch and copper nuts. The fixing plate is connected to the upper cover plate of the shell. The switch assembly includes a micro switch and a micro switch bracket, wherein the micro switch is used to be connected to the micro switch bracket. The micro switch bracket and the switch are respectively arranged on a fixed plate, the fixed plate is provided with a switch mounting boss, the switch is in the shape of a long strip, the rear arm of the switch is connected to the switch mounting boss, and the front arm is located between a pair of micro switches; The copper nut is connected to the push rod through a thread, a copper nut limiting groove is provided on the copper nut, a limiting column is provided in the middle of the switch, and the limiting column is located in the copper nut limiting groove.

2. A switch type linear electric actuator according to claim 1, characterized in that: The micro switch bracket is rectangular with one end open, and a pair of symmetrically arranged bracket forearms are provided at the opening of the micro switch bracket. The two sides of the opening of the micro switch bracket are bracket side enclosures, and the outer wall of the bracket side enclosure is provided with a bracket side wall, and the bracket side wall is used to connect the fixing plate. The micro switch bracket is located between a pair of bracket side enclosures and a bracket rear enclosure. The micro switch is connected between the rear periphery of the support and a pair of front arms of the support.

3. A switch type linear electric actuator according to claim 2, characterized in that: A pair of bracket front arms are respectively provided with a set screw 1, and a compression spring is provided on the set screw 1. A bracket position adjustment hole is provided in the middle of the rear enclosure of the bracket, and a set screw 2 is provided in the bracket position adjustment hole. The micro switch is located between the second set screw and a pair of compression springs.

4. A switch type linear electric actuator according to claim 3, characterized in that: An L-shaped bracket upper enclosure is provided above the bracket side enclosure, and a pair of bracket upper enclosures are used for covering the micro switch.

5. A switch type linear stroke electric actuator according to claim 4, characterized in that: The micro switch comprises a switch body, wherein a switch button and a switch pressing sheet are arranged in the middle of the front end of the switch body. The forearm of the switch is used to contact the switch pressing piece, and the switch pressing piece is used to contact the switch button; The two ends of the front end of the switch body are switch front shoulders respectively, and the switch front shoulders are used to contact the compression spring, and the compression spring is located on one side of the switch compression piece.

6. A switch type linear stroke electric actuator according to claim 1, characterized in that: The fixing plate is L-shaped.

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