CN113745017A - Large-stroke limit switch with double-spring linkage type driving mechanism - Google Patents
Large-stroke limit switch with double-spring linkage type driving mechanism Download PDFInfo
- Publication number
- CN113745017A CN113745017A CN202010498458.XA CN202010498458A CN113745017A CN 113745017 A CN113745017 A CN 113745017A CN 202010498458 A CN202010498458 A CN 202010498458A CN 113745017 A CN113745017 A CN 113745017A
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- China
- Prior art keywords
- contact
- spring
- button head
- switch
- sliding rod
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- Push-Button Switches (AREA)
Abstract
The invention provides a large-stroke limit switch with a double-spring linkage type driving mechanism. The contact switching mechanism comprises a driving mechanism, a contact switching mechanism, a shell structural member and an output end. The double-spring linkage type driving mechanism is adopted, a common-pole short-circuit type contact switching mechanism is used, the preset function of the switch is completed through combined positioning of structural parts, and the output end enables the switch to complete the circuit signal output function. When the switch is used, under the driving action of axial external force, the button head compresses the driving spring to move downwards, the button head, the sliding rod and the movable contact synchronously move downwards, the movable contact is simultaneously contacted and conducted with the four fixed contacts, and the switch completes circuit conversion and meets the requirement of pre-travel; when the button head is continuously pressed, the sliding rod shrinks towards the inner cavity of the button head, and the static contact shrinks towards the inner cavity of the insulating part until the button head is flush with the shell, so that the requirement of over-travel is met. When the external force is removed, the button head drives the sliding rod and the movable contact to move upwards under the combined action of the driving spring and the telescopic spring, the fixed contact moves upwards under the action of the contact spring until the surface of the button head is attached to the surface of the inner cavity of the shell, and the limit switch is restored to the free state, which is the reverse process of the pressing action. The switch has the characteristics of compact structure, reliable contact, reliable conversion and large stroke, and can quickly and accurately realize the conversion of the circuit.
Description
Technical Field
The invention relates to a large-stroke limit switch with a double-spring linkage type driving mechanism, which has the characteristics of wide application range, large stroke and stable and reliable conversion and belongs to the technical field of electronics.
Background
The limit switch is a circuit switching device triggered by the movement of a mechanical moving part to realize the connection or disconnection of a circuit.
The limit switch installed in the equipment realizes circuit conversion through the conversion of the switch contact and ensures the reliable transmission of electric signals, so as to control the stroke of the equipment and carry out terminal limit protection. At present, limit switches are various in types and varieties and mainly divided into direct-acting limit switches, roller-type limit switches, microswitch-type limit switches and the like according to structures.
At present, the existing limit switch is limited by the structural form, the stroke is small, and if the limit switch is combined with other forms to realize large stroke, the driving mechanism and the contact switching mechanism are large in size and complex in structure, and the design requirements of products in the current form on small, fine and sharp cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a long-stroke limit switch with a double-spring linkage type driving mechanism, the switch adopts the double-spring linkage type driving mechanism and a common-pole short-circuit type contact switching mechanism, the preset function of the switch is completed through combined positioning of structural parts, the output end enables the switch to complete the circuit signal output function, the structure is compact, the contact is reliable, the switching is stable, the size is small, the stroke is large, the circuit switching can be quickly, accurately and reliably realized, and the long-stroke requirement on the basis of the miniaturization of the switch is ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a large-stroke limit switch with a double-spring linkage type driving mechanism, which consists of a driving mechanism, a contact switching mechanism, a shell structural member mechanism and an output end, and is characterized in that: the double-spring linkage type driving mechanism is adopted, a common-pole short-circuit type contact switching mechanism is used, the preset function of the switch is completed through combined positioning of structural parts, and the output end enables the switch to complete the circuit signal output function.
The driving mechanism of the invention adopts a double-spring linkage type. The driving mechanism comprises a button head, a sliding rod, a movable contact, a driving spring, a telescopic spring, a gasket and the like. Under the driving action of axial external force, the button head compresses the driving spring to move downwards, the button head, the sliding rod and the movable contact synchronously move downwards, and when the movable contact is simultaneously contacted and conducted with the four fixed contacts, the switch completes circuit conversion and meets the requirement of pre-travel; when the button head is continuously pressed, the sliding rod continuously contracts towards the inner cavity of the button head until the button head is flush with the shell, so that the requirement of over-stroke is met. When the external force is removed, the button head drives the sliding rod and the movable contact to move upwards under the combined action of the driving spring and the telescopic spring, and the button head is restored to a free state, which is the reverse process of the pressing action.
One end of a telescopic spring of the driving mechanism is arranged in the inner cavity of the button head, and the other end of the telescopic spring is arranged in the inner cavity of the sliding rod. The sliding rod is arranged in the inner cavity of the button head and is attached to the plane of the gasket, and the gasket and the button head are firmly fixed in a closing-up mode. The sliding rod can freely slide in the inner cavity of the button head.
The button head of the driving mechanism is matched with the structural part of the shell, and the driving spring is arranged in the inner cavity of the shell.
The invention adopts a common-pole short-circuit type electric contact conversion mechanism, the contacts adopt a parallel combination mode, and the motion mode is a direct-acting type contact conversion mechanism, thereby realizing the reliable conversion of a plurality of groups of circuits. The contact switching mechanism comprises a sliding rod, a movable contact, a fixed contact, a contact spring, an insulating piece, an insulating cover plate, a binding post, a rivet and the like. The static contact, the contact spring and the binding post are fixed in the insulating piece, the insulating cover plate and the rivet, and the movable contact and the sliding rod are firmly fixed through riveting. When the switch is in a free state, the fixed contact is separated from the movable contact, and when the switch is in a compression state, the fixed contact is in contact with the movable contact to complete circuit conversion.
And the static contact, the contact spring and the wiring terminal of the contact switching mechanism are arranged in the hole of the insulating part, and the static contacts are mutually insulated.
The insulating part of the contact switching mechanism is provided with a step hole, and the static contact is arranged in the hole, so that the position of the static contact is limited.
The invention adopts a cylindrical shell structure, which comprises a shell, a protective cap, a nut, an end cover, a screw and epoxy glue.
The shell of the shell structural member structure is provided with a step hole, and the shell and the button head form precise matching through the size of the structural member, so that the effect of keeping the structural stability is achieved.
The lower part of the shell structure is provided with a threaded hole, and the threaded hole is matched with a nut to play a role in fixing the electric contact conversion mechanism.
Epoxy glue is filled and sealed at the lower part of the shell structural member structure, so that the lower part is moisture-proof.
The upper portion of the shell structure is provided with external threads, and the shell structure is matched with the protective cap through the threads to play a role in preventing dust on the upper portion.
The invention has the beneficial effects that: through the large-stroke limit switch with the double-spring linkage type driving mechanism, the double-spring linkage type driving mechanism and the common-pole short-circuit type contact switching mechanism are adopted, the switch preset function is completed through combined positioning of structural parts, and the output end enables the switch to complete a circuit signal output function.
Drawings
FIG. 1 is a view showing the appearance of the present invention (with a protective cap)
FIG. 2 is a front view of the present invention (limit switch released state)
FIG. 3 is a front view of the present invention (limit switch pressed state)
FIG. 4 is a schematic view of the button head structure of the present invention
FIG. 5 is a schematic view of a stationary contact assembly of the present invention
The specific implementation mode is as follows:
the invention is described in detail below with reference to the figures and specific examples.
As shown in figures 1, 2 and 3, a switch driving mechanism and a contact switching mechanism are sequentially installed in corresponding positions in a shell (7), a protective cap (8) is installed and fixed in the corresponding positions through matching with threads of the shell, and an end cover (10) is installed and fixed on the shell (7) through a set screw (18).
The invention, as shown in fig. 1, 2 and 3, comprises a driving mechanism, a contact switching mechanism, a shell structure member structure and an output end. The driving mechanism adopts a double-spring linkage type driving form, and realizes the transmission operation of the switch contact switching mechanism through the movement of the button head (9). The driving mechanism comprises a shell (7), a button head (9), a sliding rod (6), a movable contact (2), a driving spring (12), a telescopic spring (11) and a gasket (14) as shown in figures 2, 3 and 4. One end of a telescopic spring (11) is arranged in the inner cavity of the button head (10), and the other end is arranged in the inner cavity of the sliding rod (6). The sliding rod (6) is arranged in the inner cavity of the button head (10) and is attached to the plane of the gasket (14), and the gasket (14) and the button head (9) are firmly fixed in a closing mode. The sliding rod (6) can freely slide in the inner cavity of the button head (9). The button head (9) is matched with the shell (7), and the driving spring (12) is arranged in the inner cavity of the shell (7).
The shell (7) is used for installing a driving mechanism, a contact switching mechanism and a sealing structure as shown in figures 2 and 3, and the inner cavity of the shell (7) is of a step structure, so that the positioning is facilitated.
As shown in fig. 2, 3 and 5, the contact switching mechanism comprises a sliding rod (6), a moving contact (2), a fixed contact (1), a contact spring (13), an insulating piece (4), an insulating cover plate (5), a binding post (3) and a rivet (17). The static contact (1), the contact spring (13) and the wiring terminal (3) are fixed in the insulating piece (4), the insulating cover plate (5) and the rivet (3), and the moving contact (2) and the sliding rod (6) are firmly fixed through riveting. When the switch is in a free state, the fixed contact (1) is separated from the movable contact (2), and when the switch is in a compression state, the fixed contact (1) is contacted with the movable contact (2) to complete the conversion of a circuit. The static contact (1), the contact spring (13) and the wiring terminal (3) are arranged in a step hole of the insulating part (4), so that the position of the static contact (1) is limited, and the static contacts (1) are mutually insulated.
The shell structure is shown in fig. 2 and 3, and the cylindrical shell structure comprises a shell (7), a protective cap (8), a nut (16), an end cover (10), a set screw (18) and epoxy glue (23). The inner cavity of the shell (7) is provided with a step hole, and the step hole is precisely matched with the button head (9) through the size of a structural part, so that the effect of keeping the structure stable is achieved. The lower part of the shell (7) is provided with a threaded hole which is matched with the nut (16) to play a role of fixing the contact switching mechanism. Epoxy glue (23) is filled and sealed at the lower part of the shell (7) to play a role in preventing the lower part from being wetted. The upper part of the shell (7) is provided with external threads, and the shell is matched with the protective cap (8) through the threads to play a role in preventing dust on the upper part.
When the limit switch is in a free state, the driving spring (12), the telescopic spring (11) and the contact spring (13) are all in a pre-tightening state, the upper surface 91 of the button head (9) is tightly pressed on the lower surface of the inner cavity of the shell (7) under the action of the pre-tightening force of the driving spring (12), the lower surface 92 of the button head is tightly pressed on the driving spring (12), the sliding rod (6) and the movable contact (2) are tightly attached to the upper surface of the gasket (14) under the action of the pre-tightening force of the telescopic spring (11), and the lower surface of the sliding rod (6) is tightly attached to the upper surface of the gasket (14).
The working process of the invention is as follows:
the limit switch is switched from a free state to a pressing state, as shown in figure 2, under the driving action of an axial external force, a button head (9) compresses a driving spring (12) to move downwards, the button head (9), a sliding rod (6) and a movable contact (2) synchronously move downwards, the movable contact (2) is simultaneously contacted and conducted with four fixed contacts (1), and the switch completes circuit switching to meet the requirement of pre-travel; when the button head (9) is continuously pressed, the sliding rod (6) continuously contracts towards the inner cavity of the button head (9), the static contact (1) contracts towards the inner cavity of the insulating part (4) until the button head (9) is flush with the shell (7) to meet the requirement of over-travel, and the limit switch circuit is switched from a free state to a pressing state as shown in figure 3.
The limit switch is switched from a pressing state to a free state, as shown in fig. 3, when external force is removed, the button head (9) drives the sliding rod (6) and the movable contact (2) to move upwards under the combined action of the driving spring (12) and the telescopic spring (11), the fixed contact (1) moves upwards under the action of the contact spring (13), the button head (9) moves upwards until the movable contact (2) and the fixed contact (1) are separated, at the moment, the switching action of the limit switch circuit is completed, the button head (9) continues to move upwards under the elastic force of the driving spring (12) until the upper surface 91 of the button head (9) meets the lower surface of the inner cavity of the shell (7) to stop, the limit switch returns to the free state, and the limit switch circuit is switched from the pressing state to the free state, as shown in fig. 2, the reverse process of pressing action is performed.
The invention has not been described in detail and is in part known to those of skill in the art.
Claims (7)
1. The utility model provides a big travel limit switch with two spring coordinated type actuating mechanism, it includes actuating mechanism, contact shifter, casing structure and output, characterized by: the double-spring linkage type driving mechanism is adopted, a common-pole short-circuit type contact switching mechanism is used, the preset function of the switch is completed through combined positioning of structural parts, and the output end enables the switch to complete the circuit signal output function.
2. The long travel limit switch with a dual-spring linkage drive mechanism of claim 1, wherein: adopts a double-spring linkage type driving mechanism. The driving mechanism comprises a shell, a button head, a sliding rod, a movable contact, a driving spring, a telescopic spring, a gasket and the like. Under the driving action of axial external force, the button head compresses the driving spring to move downwards, the button head, the sliding rod and the movable contact synchronously move downwards, the movable contact is simultaneously contacted and conducted with the four fixed contacts, and the switch completes circuit conversion to meet the requirement of pre-stroke; when the button head is continuously pressed, the sliding rod shrinks towards the inner cavity of the button head, and the static contact shrinks towards the inner cavity of the insulating part until the button head is flush with the shell, so that the requirement of over-travel is met. When the external force is removed, the button head drives the sliding rod and the movable contact to move upwards under the combined action of the driving spring and the telescopic spring, the fixed contact moves upwards under the action of the contact spring until the surface of the button head is attached to the surface of the inner cavity of the shell, and the limit switch is restored to the free state, which is the reverse process of the pressing action.
3. The drive mechanism of claim 2, wherein: one end of the telescopic spring is arranged in the inner cavity of the button head, and the other end of the telescopic spring is arranged in the inner cavity of the slide bar. The sliding rod is arranged in the inner cavity of the button head and is attached to the plane of the gasket, and the gasket and the button head are firmly fixed in a closing-up mode. The sliding rod can freely slide in the inner cavity of the button head.
4. The drive mechanism of claim 2, wherein: the button head is matched with a structural part of the shell, and the driving spring is arranged in an inner cavity of the shell.
5. The long travel limit switch with a dual-spring linkage drive mechanism of claim 1, wherein: the utility model adopts a common-pole short-circuit type electric contact switching mechanism, the contacts adopt a parallel combination mode, and the movement mode is a direct-acting type contact switching mechanism, thereby realizing the reliable switching of a plurality of groups of circuits. The contact switching mechanism comprises a sliding rod, a movable contact, a fixed contact, a contact spring, an insulating piece, an insulating cover plate, a binding post, a rivet and the like. The static contact, the contact spring and the binding post are fixed in the insulating piece, the insulating cover plate and the rivet, and the movable contact and the sliding rod are firmly fixed through riveting. When the switch is in a free state, the fixed contact is separated from the movable contact, and when the switch is in a compression state, the fixed contact is in contact with the movable contact to complete circuit conversion.
6. The contact switching mechanism of claim 5, wherein: the static contact, the contact spring and the wiring terminal are arranged in the insulating part hole, and the static contacts are mutually insulated.
7. The long travel limit switch with a dual-spring linkage drive mechanism of claim 1, wherein: a cylindrical shell structure is adopted, and the cylindrical shell structure comprises a protective cap, a shell, a nut, an end cover, a screw and epoxy glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010498458.XA CN113745017A (en) | 2020-05-30 | 2020-05-30 | Large-stroke limit switch with double-spring linkage type driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010498458.XA CN113745017A (en) | 2020-05-30 | 2020-05-30 | Large-stroke limit switch with double-spring linkage type driving mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113745017A true CN113745017A (en) | 2021-12-03 |
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ID=78728033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010498458.XA Pending CN113745017A (en) | 2020-05-30 | 2020-05-30 | Large-stroke limit switch with double-spring linkage type driving mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113745017A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115132511A (en) * | 2022-07-11 | 2022-09-30 | 沈阳仪表科学研究院有限公司 | Pressure switch for realizing mechanical unlocking function and unlocking method thereof |
-
2020
- 2020-05-30 CN CN202010498458.XA patent/CN113745017A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115132511A (en) * | 2022-07-11 | 2022-09-30 | 沈阳仪表科学研究院有限公司 | Pressure switch for realizing mechanical unlocking function and unlocking method thereof |
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