High-sensitivity double-point contact single-pole microswitch

Abstract

The invention provides a high-sensitivity double-point contact single-pole microswitch. The high-sensitivity double-point contact single-pole microswitch comprises a base group, the base set is sleeved with a shell, and a mounting cavity is formed between the base set and the shell. An upper contact piece, a lower contact piece and a supporting frame which are connected with the base set are sequentially arranged in the installation cavity. A flat reed assembly and a bow reed are connected to the supporting frame. The shell is provided with a key, and the key is matched with the flat reed assembly to work; the support frame is provided with an inclined trapezoidal groove, and the bow reed is connected with the support frame through the inclined trapezoidal groove; the flat reed assembly comprises a flat reed, one end of the flat reed is provided with a plurality of movable contacts, and the other end of the flat reed is connected with the supporting frame. According to the double-insurance single-pole microswitch, the double-insurance problem of contact of an existing single-pole microswitch is solved, a traditional single-point contact mode of a single movable contact and a contact piece is changed into double-point contact, and a single-insurance single-pole microswitch is improved into a double-insurance single-pole microswitch under the condition that indexes such as the boundary dimension and the action characteristic of the switch are not changed; contact reliability of the switch is greatly improved, and actual requirements are met.

Description

Technical Field

[0001] The present invention relates to a highly sensitive double-point contact single-pole micro switch, belonging to the technical field of electromechanical components, and in particular to a fully synchronous double-point contact single-pole micro switch with extremely high sensitivity. Background Art

[0002] Micro switches are also called sensitive switches. Their characteristics are that under the action of the instantaneous mechanism inside the switch, the switch contacts can switch quickly, the action is sensitive, and the parameter accuracy is high. They are mainly used for automatic control and signal monitoring in circuits.

[0003] As the reliability requirements for electronic products such as micro switches become increasingly higher, the contact form of the switch is required to have a double insurance function (i.e., a double-point contact structure) to improve the contact reliability of the switch and ensure the normal operation of the equipment or system. The contact form of the traditional single-pole micro switch is a "spherical-plane" single-point contact. In order to improve its contact reliability, the traditional practice is to directly use two or more micro switches in parallel, that is, to make redundant micro switches. However, when multiple micro switches are used in parallel, since one actuator presses the buttons of several micro switch units at the same time, there are often certain differences in the external dimensions and movement strokes between the micro switch units. In actual production control, it is almost impossible for each micro switch unit to achieve completely synchronous operation.

[0004] At the same time, due to the original design and installation space limitations of the single-pole micro switch, it is often required to achieve the double insurance function of the switch contact without changing the switch's external dimensions, action characteristics and other indicators. It is usually difficult to use the traditional combined structure of multiple micro switch units in parallel to perform double insurance processing on the switch contact. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a high-sensitivity double-point contact single-pole micro switch. The double-point contact single-pole micro switch only improves the internal contact mechanism of the switch, and can achieve the double insurance function of the switch contact without changing the original switch appearance. It can be promoted in a wide range. All single-pole micro switches can adopt the double-point elastic contact structure for double insurance processing.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a high-sensitivity double-point contact single-pole micro switch, comprising a base group; a shell is connected to the outer surface of the base group, and an installation chamber is formed between the base group and the shell; an upper contact piece, a lower contact piece, and a support frame connected to the base group are provided in sequence in the installation chamber, and a flat spring assembly and a bow spring are connected to the support frame; a button is provided on the shell, and the button cooperates with the flat spring assembly; an inclined trapezoidal groove is provided on the support frame, and the bow spring is connected to the support frame via the inclined trapezoidal groove; the flat spring assembly includes a flat spring, one end of which is provided with multiple moving contacts, and the other end is connected to the support frame.

[0008] One end of the support frame is connected to the flat spring assembly, and the other end is connected to the bow spring.

[0009] The support point O of the bow spring piece on the support frame is an inclined trapezoidal groove structure, and an angle θ is formed between the end face of the bow spring piece and the middle inclined face of the support frame.

[0010] The contact surfaces of the lower contact piece and the upper contact piece are both planes, and the contact surface of the moving contact is a spherical surface.

[0011] One end of the bow spring is connected to the support frame in a line contact manner, and the other end is connected to the flat spring in a hinge contact manner.

[0012] One end of the flat spring piece cooperates with the upper contact piece and the lower contact piece, and the other end cooperates with the key.

[0013] The flat spring piece is a shift fork structure.

[0014] The movable contact is in double-point elastic contact with the lower contact piece and the upper contact piece.

[0015] The lower contact piece, the upper contact piece, the support frame and the base assembly are riveted together, and the joint surface between the base assembly and the shell is coated with epoxy resin glue for sealing.

[0016] The beneficial effects of the present invention are: solving the double insurance problem of the existing single-pole micro switch contact, changing the traditional single-point contact form of a single moving contact (fixed contact) and a contact piece into a double-point contact, and improving the single-insurance single-pole micro switch into a double-insurance single-pole micro switch without changing the switch's external dimensions, action characteristics and other indicators, thereby greatly improving the contact reliability of the switch and meeting actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the flat spring assembly of the present invention;

[0019] Figure 3 yes Figure 1 An enlarged view of point I in FIG;

[0020] Figure 4 yes Figure 3 Schematic diagram of the structure of the mid-oblique trapezoidal groove;

[0021] Figure 5 It is a working principle diagram of the present invention;

[0022] In the figure: 1-base assembly, 2-lower contact piece, 3-upper contact piece, 4-flat spring assembly, 401-flat spring, 402-moving contact, 5-bow spring, 6-button, 7-housing, 8-support frame. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] like Figure 1 As shown, the upper end surface of the base group 1 is provided with an upper contact piece 3, a lower contact piece 2 and a support frame 8 in sequence, one end of the support frame 8 is connected to a flat spring assembly 4, and the other end is connected to a bow spring 5; the base group 1 is outer-connected with a shell 7, and the upper end surface of the shell 7 is provided with a button 6 that contacts the support frame 8.

[0025] like Figure 2 As shown, the flat spring assembly 4 includes a flat spring 401 and two moving contacts 402, and the two moving contacts 402 are fixed to the flat spring 401 by riveting; one end of the bow spring 5 is connected to the support frame 8, and the contact method is line contact (single line), and the other end is connected to the flat spring 401, and the contact method is hinge (double line contact).

[0026] Specifically, one end of the flat spring piece 401 is connected to the support frame 8 , the other end is riveted with two moving contacts 402 , and the middle portion is connected to the bow spring piece 5 .

[0027] like Figure 3 and 4 As shown, the forming punch for the "oblique trapezoidal groove" structure of the support frame 8 is processed by a special high-precision grinding method for its fine structure.

[0028] Furthermore, the support point O between the support frame 8 and the bow spring piece 5 is an inclined trapezoidal groove structure, and there is a certain angle θ between the end face of the bow spring piece 5 and the middle inclined surface of the support frame 8, which can ensure that the contact between the support frame 8 and the bow spring piece 5 is always linear contact during the entire switch operation process and the contact point does not change, which can maximize the switching sensitivity of the switch.

[0029] Specifically, the upper contact piece 3 , the lower contact piece 2 , the support frame 8 and the base assembly 1 are riveted together.

[0030] Specifically, epoxy resin glue is coated around the joint surface between the base assembly 1 and the housing 7 .

[0031] Specifically, the flat spring piece 401 is an elastic part, and the upper flat spring piece 401 is a shift fork structure, and its two riveted moving contacts 402 are symmetrically distributed on both sides of the shift fork.

[0032] Furthermore, the two riveted moving contacts 402 achieve elastic contact under the elasticity of the flat spring 401 (the two moving contacts 402 are riveted on the same flat spring 401), ensuring that the two moving contacts 402 are in completely synchronous and reliable contact at the same time.

[0033] Specifically, the contact portion of the movable contact 402 is a spherical structure, and the contact surfaces of the upper contact piece 3 and the lower contact piece 2 are both planar structures.

[0034] Furthermore, the contact form between the moving contact 402 and the contact piece is a "spherical-plane" point contact, and the two moving contacts 402 are symmetrically distributed on both sides of the flat spring piece 401; when the switch is in the free state, the two moving contacts 402 contact the upper contact piece 3 at the same time; when the switch is in the pressed state, the two moving contacts contact the lower contact piece 2 at the same time.

[0035] Specifically, the flat spring assembly 4 includes a flat spring 401 and a moving contact 402 . The moving contact 402 is fixed to the fork structure of the flat spring 401 by riveting.

[0036] Specifically, the upper end surface of the movable contact 402 corresponds to the position of the upper contact piece 3 , and the lower end surface corresponds to the position of the lower contact piece 2 .

[0037] Specifically, one end of the bow spring 5 is connected to the flat spring 401 , and the other end is connected to the support frame 8 .

[0038] like Figure 5 As shown, the working principle of the present invention is as follows: the switch reversing mechanism is composed of the button 6, the flat spring 401, the moving contact 402, the bow spring 5 and the support frame 8. When the switch button 6 is in the free position, the spherical parts of the two moving contacts 402 are simultaneously connected with the flat part of the upper contact piece 3 by the common elastic force of the bow spring 7 and the flat spring 401. At this time, C-NC is turned on and C-NO is turned off. When the button 6 is pressed to the switch reversing position, under the action of the reversing mechanism, the two moving contacts 402 are quickly disconnected from the upper contact piece 3 at the same time. After opening, it contacts the lower contact piece 2. At this time, C-NC is disconnected and C-NO is connected, realizing the switch conversion. The bow spring piece 5 and the flat spring piece 401 are elastically deformed due to compression and store elastic potential energy; when the switch button 6 is released, under the joint elastic force of the bow spring piece 7 and the flat spring piece 401, the two moving contacts 402 are disconnected from the lower contact piece 2 and then re-contacted with the upper contact piece 3. At this time, C is disconnected from the NO end and then re-connected with the NC end. At this time, the bow spring piece 5 and the flat spring piece 401 release the elastic potential energy, and the switch completes one action cycle.

[0039] In summary, the beneficial effects of the present invention are:

[0040] 1. It adopts the double-point elastic contact form, relying on the deformation of the flat spring of the elastic part to achieve elastic contact, which can effectively ensure that the double moving contacts can reliably contact the contact piece at the same time, greatly improving the contact reliability of the switch; it can realize the double insurance function of the switch contact without changing the original switch appearance, and can be promoted in a wide range. All single-pole micro switches can adopt the double-point contact structure for double insurance processing.

[0041] 2. The flat spring is made into a fork structure, and the two moving contacts are riveted to the forks on both sides of the same flat spring. This ensures that the flat spring can drive the two moving contacts to move simultaneously during operation, so that the two moving contacts can achieve complete synchronization without any difference.

[0042] 3. The part of the support frame that cooperates with the bow spring piece is cleverly designed into an "oblique trapezoidal groove" structure. On the one hand, it ensures that there is a certain angle θ between the end face of the bow spring piece and the middle inclined surface of the "oblique trapezoidal groove", so that their contact form is always linear contact during the entire action cycle, and the contact point (support point O) does not change. This can maximize the sensitivity of the micro switch, that is, there is no "hanging" phenomenon; on the other hand, it ensures that the bow spring piece cannot slide downward from the middle inclined surface of the "oblique trapezoidal groove", and at the same time ensures that the action and release positions of the switch will not change during operation. The stroke accuracy is maximized, which can ensure that the switch operates within the specified precise stroke, greatly improving the working reliability of the switch.

[0043] 3. The mold punch used to form the "oblique trapezoidal groove" structure of the support frame is processed using a special grinding process to ensure that the "oblique trapezoidal groove" has a clear outline and no chamfers or rounded corners.

Claims

1. A high-sensitivity double-point contact single-pole micro switch, comprising a base assembly (1), characterized in that: The base assembly (1) is connected to a housing (7) on its outer surface, and an installation chamber is formed between the base assembly (1) and the housing (7); an upper contact piece (3), a lower contact piece (2), and a support frame (8) are sequentially provided in the installation chamber, and a flat spring assembly (4) and a bow spring (5) are connected to the support frame (8); a key (6) is provided on the housing (7), and the key (6) cooperates with the flat spring assembly (4); an inclined trapezoidal groove is provided on the support frame (8), and the bow spring (5) is connected to the support frame (8) via the inclined trapezoidal groove; the flat spring assembly (4) includes a flat spring (401), one end of which is provided with a plurality of moving contacts (402), and the other end is connected to the support frame (8).

2. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: One end of the support frame (8) is connected to the flat spring assembly (4), and the other end is connected to the bow spring (5).

3. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: The support point O of the bow spring piece (5) on the support frame (8) is an inclined trapezoidal groove structure, and an angle θ exists between the end face of the bow spring piece (5) and the middle inclined face of the support frame (8).

4. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: The contact surfaces of the lower contact piece (2) and the upper contact piece (3) are both planes, and the contact surface of the moving contact (402) is a spherical surface.

5. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: One end of the bow spring piece (5) is connected to the support frame (8) in a line contact manner, and the other end is connected to the flat spring piece (401) in a hinge contact manner.

6. The double-point contact single-pole micro switch according to claim 1, wherein: One end of the flat spring piece (401) cooperates with the upper contact piece (3) and the lower contact piece (2), and the other end cooperates with the key (6).

7. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: The flat spring piece (401) is a shift fork structure.

8. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: The movable contact (402) is in double-point elastic contact with the lower contact piece (2) and the upper contact piece (3).

9. The high-sensitivity double-point contact single-pole micro switch according to claim 1, characterized in that: The lower contact piece (2), the upper contact piece (3), the support frame (8) and the base assembly (1) are riveted together, and the joint surface between the base assembly (1) and the shell (7) is coated with epoxy resin glue for sealing.

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