Limit switch

Abstract

The utility model relates to the technical field of switches, and discloses a limit switch which comprises a shell, a driving part and a movable contact piece are rotationally connected to the shell, a static contact piece is arranged on the shell, the driving part is used for driving the movable contact piece to abut against the static contact piece, a first torsion spring is arranged on the movable contact piece, the first torsion spring drives the movable contact piece to be separated from the static contact piece, and a rotating strip is rotationally connected to the shell. A second torsional spring is arranged on the rotating strip and drives the rotating strip to rotate; when the movable contact piece abuts against the static contact piece, the second torsional spring drives the movable contact piece to move in the direction away from the static contact piece, the second torsional spring drives the rotating strip to rotate on the shell, the rotating strip abuts against the movable contact piece to move, the movable contact piece moves in the direction away from the static contact piece, and therefore the movable contact piece can rotate under the acting force of the first torsional spring and the rotating strip; the first torsion spring can rotate quickly, even if the first torsion spring is abraded, the rotating strip can drive the movable contact piece to rotate, and the limit switch can be used normally.

Description

Technical Field

[0001] The present application relates to the technical field of switches, and in particular to a limit switch. Background Art

[0002] A limit switch, also known as a travel switch, is a commonly used low-current master electrical appliance. It is usually used to limit the position or travel of mechanical movement, so that the moving machine can automatically stop, reverse, change speed, or automatically move back and forth at a certain position or travel.

[0003] In the related technology, the limit switch includes a shell, a driving member and a moving contact piece are rotatably connected to the shell, a static contact piece is provided on the shell, the driving member extends out of the shell, the moving contact piece is located on the rotation path of the driving member, a first torsion spring is provided on the moving contact piece, the first torsion spring drives the moving contact piece to separate from the static contact piece, and the static contact piece is located on the rotation path of the moving contact piece; when an object abuts the driving member, the driving member rotates, and the driving member drives the moving contact piece to move, so that the moving contact piece abuts the static contact piece.

[0004] Since the first torsion spring drives the movable contact piece to rotate for a long time, the first torsion spring may be worn out, so that the first torsion spring drives the movable contact piece to rotate slowly, affecting the normal use of the limit switch. Utility Model Content

[0005] In order to improve the problem that the first torsion spring drives the movable contact piece to rotate slowly, the present application provides a limit switch.

[0006] This application provides a limit switch, which adopts the following technical solution:

[0007] A limit switch comprises a shell, a driving member and a moving contact piece being rotatably connected to the shell, a static contact piece being provided on the shell, the driving member being used to drive the moving contact piece to abut against the static contact piece, a first torsion spring being provided on the dynamic contact piece, the first torsion spring driving the moving contact piece to separate from the static contact piece, a rotating bar being rotatably connected to the shell, a second torsion spring being provided on the rotating bar, the second torsion spring driving the rotating bar to rotate; when the moving contact piece abuts against the static contact piece, the second torsion spring drives the moving contact piece to move in a direction away from the static contact piece.

[0008] By adopting the above technical solution, the second torsion spring drives the rotating bar to rotate on the shell, and the rotating bar abuts against the moving contact piece to move, so that the moving contact piece moves in the direction away from the static contact piece, so that the moving contact piece can be rotated by the force of the first torsion spring and the rotating bar, so that the moving contact piece can rotate stably and the first torsion spring can rotate quickly. Even if the first torsion spring has a wear problem, the rotating bar can drive the moving contact piece to rotate, so that the limit switch can be used normally.

[0009] Optionally, an extension bar is provided on the movable contact piece, a rotating shaft is provided on the housing, the movable contact piece and the extension bar are rotatably connected to two sides of the rotating shaft respectively, and the extension bar can abut against the rotating bar.

[0010] By adopting the above technical solution, the extension bar and the movable contact piece are respectively located on both sides of the rotating shaft, and the rotating bar can abut the extension bar. When the movable contact piece abuts the static contact piece, the rotating bar abuts the extension bar, allowing the extension bar to rotate on the rotating shaft, so that the extension bar can drive the movable contact piece to move in the direction away from the static contact piece; through the lever principle, compared with the rotating bar directly acting on the movable contact piece, the force arm of the rotating bar acting on the extension bar is longer. When the rotating bar applies the same force, the force applied to the movable contact piece is increased, so that the movable contact piece can move faster in the direction away from the static contact piece, thereby realizing rapid opening of the circuit breaker.

[0011] Optionally, a limiting rod is provided on the shell, an extension block is provided on the extension bar, and the limiting rod is located on the rotation path of the extension block; when the movable contact piece abuts against the static contact piece, the extension block abuts against the limiting rod.

[0012] By adopting the above technical solution, the limit rod is located on the rotation path of the extension block. When the driving member drives the movable contact piece to rotate, the movable contact piece abuts the static contact piece. At this time, the extension block can abut the limit rod. The extension block restricts the rotation of the movable contact piece, making it difficult for the movable contact piece to rotate excessively, thereby reducing the situation where the movable contact piece excessively abuts against the static contact piece and causes damage to the movable contact piece or the static contact piece.

[0013] Optionally, a rotating rod is provided on the rotating bar, the rotating bar is rotatably connected to the rotating rod, and a fixing component is provided on the rotating rod, and the fixing component is used to fix the rotating rod to the shell.

[0014] By adopting the above technical solution, the rotating rod is fixed to the housing through the fixing assembly, so that the rotating bar can rotate on the housing, and the rotating bar can rotate stably on the housing.

[0015] Optionally, the fixing assembly includes a fixing bar and a fixing spring, the shell is provided with a through hole for the rotating rod to pass through, the rotating rod is provided with a fixing hole for the fixing bar to be inserted into the fixing hole, and the fixing spring drives the fixing bar to be inserted into the fixing hole; when the fixing bar is inserted into the fixing hole, the rotating rod is fixed to the shell.

[0016] By adopting the above technical solution, the fixing bar is driven to move by the fixing spring, so that the fixing bar is inserted into the fixing hole. Since the fixing spring restricts the fixing bar from being separated from the fixing hole, the fixing bar and the rotating rod can be fixed to each other, so that the fixing bar limits the rotating rod, making it difficult for the rotating rod to be separated from the housing.

[0017] Optionally, a accommodating bar is slidably connected to the shell, and the fixing bar is located on a sliding path of the accommodating bar; when the accommodating bar abuts against the fixing bar, the fixing bar does not abut against the rotating rod.

[0018] By adopting the above technical solution, the staff slides the accommodating bar. Since the fixing bar is located on the sliding path of the accommodating bar, the accommodating bar limits the fixing bar, so that the fixing bar cannot abut against the rotating rod, and the fixing bar cannot be inserted into the fixing hole, so that the rotating rod can pass through the through hole smoothly.

[0019] Optionally, a movable groove is provided on the inner wall of the through-hole, a movable bar is provided in the movable groove, the movable bar is arranged on the accommodating bar, a movable spring is provided in the movable groove, and the movable spring drives the movable bar to be inserted into the through-hole; when the movable bar is located in the through-hole, the accommodating bar abuts against the fixed bar; when the movable bar is completely located in the movable groove, the accommodating bar does not abut against the fixed bar.

[0020] By adopting the above technical solution, the staff slides the moving bar so that the moving bar is located in the moving groove, and the moving bar will not restrict the rotating rod from being inserted into the through hole. In addition, the moving bar is arranged on the accommodating bar, so that the moving bar can drive the accommodating bar to move, so that the accommodating bar will not abut the fixed bar, so that the fixed spring can smoothly drive the fixed bar to move, thereby realizing the limiting of the rotating rod by the fixed bar.

[0021] Optionally, a moving slope is provided on the surface of the moving bar, the distance between the moving slope and the moving spring gradually increases along the direction from the rotating bar to the moving bar, and the moving slope is located in the insertion path of the rotating rod.

[0022] By adopting the above technical solution, the movable inclined surface is located in the insertion path of the rotating rod, so that the staff does not need to manually move the movable bar. The staff directly inserts the rotating rod into the through hole and allows the rotating rod to drive the movable bar to move through the movable inclined surface, so that the movable bar is located in the movable groove.

[0023] Optionally, an isolation plate is provided on the shell, the driving member passes through the isolation plate, the moving contact piece and the static contact piece are both located on one side of the isolation plate, a button is provided on the shell, and a driving gear is provided on the driving member, the button and the driving gear are engaged with each other, and the button is located on the side of the isolation plate away from the moving contact piece and the static contact piece; when the button moves, the button drives the driving member to rotate through the driving gear.

[0024] By adopting the above technical solution, the button is engaged with the driving gear. When the button moves, the button can drive the driving member to rotate through the driving gear, so that the driving member can drive the moving contact piece to rotate; because the button and the moving contact piece and the static contact piece are respectively located on both sides, the sparks generated when the moving contact piece and the static contact piece are separated will not affect the button, thereby reducing the problem of damage to the button.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The second torsion spring drives the rotating bar to rotate on the housing, and the rotating bar abuts against the moving contact piece to move, so that the moving contact piece moves in the direction away from the static contact piece, so that the moving contact piece can be rotated by the force of the first torsion spring and the rotating bar, so that the moving contact piece can rotate stably and the first torsion spring can rotate quickly. Even if the first torsion spring is worn, the rotating bar can also drive the moving contact piece to rotate in time, so that the limit switch can be used normally.

[0027] 2. The fixing bar is driven to move by the fixing spring, so that the fixing bar is inserted into the fixing hole. Since the fixing spring restricts the fixing bar from being separated from the fixing hole, the fixing bar and the rotating rod can be fixed to each other, so that the fixing bar limits the rotating rod, making it difficult for the rotating rod to be separated from the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a structural diagram of Example 1;

[0029] Figure 2 This is a structural diagram highlighting the first placement slot in Example 1;

[0030] Figure 3 This is a structural diagram highlighting the second placement slot in Example 1;

[0031] Figure 4 is a structural diagram of Example 2;

[0032] Figure 5 yes Figure 4 A magnified schematic diagram of part A;

[0033] Figure 6 It is along Figure 4 Partial cross-sectional view along line BB.

[0034] Figure numerals: 1. Shell; 11. Isolation plate; 111. First placement slot; 112. Second placement slot; 113. Placement hole; 114. Sliding slot; 12. Rotating shaft; 13. Limiting rod; 14. Rotating hole; 15. Perforation; 151. Moving slot; 152. Moving spring; 153. Moving bar; 154. Moving inclined plane; 16. Accommodating slot; 161. Accommodating bar; 2. Driving member; 21. Button; 22. Driving gear; 23. First torsion spring; 24. Rotating rod; 241. Rotating bar; 242. Second torsion spring; 243. Fixing hole; 25. Driving rod; 26. Driving block; 3. Moving contact piece; 31. Extension bar; 311. Extension block; 4. Static contact piece; 5. Fixing assembly; 51. Fixing bar; 52. Fixing spring. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] Example 1

[0037] This embodiment discloses a limit switch. Figure 1 and Figure 2 A limit switch includes a housing 1 with an isolation plate 11 integrally formed on the housing 1.

[0038] Reference Figure 2 and Figure 3 A first placement groove 111 and a second placement groove 112 are opened on the surfaces of the shell 1 on two opposite sides, and the isolation plate 11 is located between the first placement groove 111 and the second placement groove 112.

[0039] Reference Figure 2 and Figure 3 The housing 1 is rotatably connected to a driver 2 and a movable contact piece 3. A button 21 is slidably connected to the housing 1, and a stationary contact piece 4 is fixedly connected to the housing 1. The button 21 is located in a first placement groove 111, and the movable contact piece 3 and the stationary contact piece 4 are located in a second placement groove 112. The isolation plate 11 is provided with a placement hole 113, through which the driver 2 passes. A portion of the driver 2 is located in the first placement groove 111, and the other portion is located in the second placement groove 112. The driver 2 is used to drive the movable contact piece 3 to rotate toward the stationary contact piece 4.

[0040] Reference Figure 2 and Figure 3The driving member 2 includes a driving rod 25 and a driving block 26. The driving rod 25 is rotatably connected to the isolation plate 11, and the driving block 26 is fixedly connected to the driving rod 25. A driving gear 22 is fixedly connected to the outer surface of the driving rod 25, and the driving gear 22 is located in the second receiving groove 112. The button 21 has an external tooth block on its surface, and the external tooth block and the driving gear 22 engage with each other. When the button 21 slides, the button 21 drives the driving rod 25 to rotate via the driving gear 22.

[0041] Reference Figure 2 The isolation plate 11 is fixedly connected to the rotating shaft 12. An extension bar 31 is integrally formed on the movable contact piece 3, rotatably connected to the rotating shaft 12. The movable contact piece 3 and the extension bar 31 are located on different sides of the rotating shaft 12, with the movable contact piece 3 located on the side of the rotating shaft 12 facing the stationary contact piece 4. An extension block 311 is integrally formed on the surface of the extension bar 31, and the drive block 26 is located in the rotation path of the extension block 311. When the drive rod 25 rotates, the drive block 26 drives the extension block 311 to rotate, causing the movable contact piece 3 to abut the stationary contact piece 4.

[0042] Reference Figure 2 A limiting rod 13 is fixedly connected to the surface of the isolation plate 11, and the limiting rod 13 is located on the rotation path of the extension block 311. When the extension block 311 abuts against the limiting rod 13, the moving contact piece 3 abuts against the static contact piece 4.

[0043] Reference Figure 2 and Figure 3 A first torsion spring 23 is fixedly connected to the surface of the rotating shaft 12, which drives the movable contact piece 3 to rotate away from the stationary contact piece 4. The housing 1 is provided with a rotating rod 24, which is provided with a fixing assembly 5. The fixing assembly 5 includes external threads integrally formed on the outer surface of the rotating rod 24. A rotating hole 14 is formed on the surface of the isolation plate 11, and the groove wall of the rotating hole 14 is threadedly connected to the external thread.

[0044] Reference Figure 2 The rotating rod 24 is rotatably connected to a rotating bar 241, and the extension bar 31 is located on the rotation path of the rotating bar 241. A second torsion spring 242 is sleeved on the surface of the rotating bar 241, and the second torsion spring 242 drives the rotating bar 241 to rotate toward the direction of the static contact piece 4.

[0045] Reference Figure 2 The second torsion spring 242 drives the rotating bar 241 to rotate, and the rotating bar 241 drives the extension bar 31 to move, so that the extension bar 31 rotates in a direction away from the static contact piece 4, sharing the force of the moving contact piece 3 rotating away from the static contact piece 4.

[0046] The implementation principle of Example 1 is as follows: when the button 21 is not touched, the first torsion spring 23 drives the movable contact piece 3 to rotate in the direction away from the static contact piece 4; at the same time, the second torsion spring 242 drives the rotating bar 241 to rotate, so that the rotating bar 241 drives the extension bar 31 to rotate, and the extension bar 31 drives the movable contact piece 3 to rotate in the direction away from the static contact piece 4, thereby separating the movable contact piece 3 and the static contact piece 4.

[0047] Example 2

[0048] Reference Figure 4 and Figure 5 This embodiment differs from Embodiment 1 in that the fixing assembly 5 includes a fixing bar 51 and a fixing spring 52. A through-hole 15 is formed on the surface of the isolation plate 11 for the rotation rod 24 to pass through, and a sliding groove 114 is formed on the surface of the isolation plate 11 facing the first placement groove 111. One end of the fixing spring 52 is fixedly connected to the wall of the sliding groove 114, and the other end of the fixing spring 52 is fixedly connected to the surface of the fixing bar 51.

[0049] Reference Figure 5 The outer surface of the rotating rod 24 is provided with a fixing hole 243 for inserting the fixing bar 51. When the fixing bar 51 is inserted into the fixing hole 243, the fixing spring 52 is in a non-stressed state; when the fixing bar 51 does not abut the rotating rod 24, the fixing spring 52 is in a compressed state.

[0050] Reference Figure 5 and Figure 6 A movable groove 151 is formed on the inner wall of the through-hole 15. A movable spring 152 is fixedly connected to the bottom wall of the movable groove 151. A movable bar 153 is fixedly connected to the end surface of the movable spring 152 away from the bottom wall of the movable groove 151. The movable spring 152 drives the movable bar 153 to be inserted into the through-hole 15. That is, when the movable bar 153 is located in the through-hole 15, the movable spring 152 is in a non-stressed state; when the movable bar 153 is completely located in the movable groove 151, the movable spring 152 is in a compressed state.

[0051] Reference Figure 6 A movable bevel 154 is fixedly connected to the end surface of the movable bar 153 away from the movable spring 152. The distance between the movable bevel 154 and the movable spring 152 gradually increases from the second placement groove 112 to the first placement groove 111. The movable bevel 154 is located in the insertion path of the rotating rod 24. When the rotating rod 24 is inserted into the through hole 15, the rotating rod 24 drives the movable bar 153 to move via the movable bevel 154, so that the movable bar 153 is completely located in the movable groove 151.

[0052] Reference Figure 5 and Figure 6The surface of the isolation plate 11 facing the first placement groove 111 defines a receiving groove 16, which connects the movable groove 151 and the sliding groove 114. A receiving bar 161 is fixedly connected to the surface of the movable bar 153, and the receiving bar 161 slides within the receiving groove 16. When the movable bar 153 is fully within the movable groove 151, the receiving bar 161 is located in the sliding path of the fixed bar 51. When the movable bar 153 is inserted into the through-hole 15, the receiving bar 161 does not abut the fixed bar 51.

[0053] The implementation principle of Example 2 is as follows: when the rotating rod 24 is inserted into the through hole 15, the rotating rod 24 drives the moving bar 153 to move through the moving inclined surface 154, so that the moving bar 153 is completely located in the moving groove 151, and the moving bar 153 drives the accommodating bar 161 to move, so that the accommodating bar 161 does not limit the fixed bar 51, and the fixing spring 52 drives the fixed bar 51 to be inserted into the fixing hole 243, thereby realizing the limiting of the rotating rod 24 by the fixed bar 51.

[0054] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present application should be included in the scope of protection of the present application.

Claims

1. A limit switch, comprising a housing (1), wherein a driving member (2) and a moving contact piece (3) are rotatably connected to the housing (1), a stationary contact piece (4) is provided on the housing (1), the driving member (2) is used to drive the moving contact piece (3) to abut against the stationary contact piece (4), the moving contact piece (3) is provided with a first torsion spring (23), and the first torsion spring (23) drives the moving contact piece (3) to separate from the stationary contact piece (4), characterized in that: A rotating bar (241) is rotatably connected to the housing (1), and a second torsion spring (242) is provided on the rotating bar (241). The second torsion spring (242) drives the rotating bar (241) to rotate; when the movable contact piece (3) abuts against the stationary contact piece (4), the second torsion spring (242) drives the movable contact piece (3) to move in a direction away from the stationary contact piece (4).

2. A limit switch according to claim 1, characterized in that: The movable contact piece (3) is provided with an extension bar (31), the housing (1) is provided with a rotation shaft (12), the movable contact piece (3) and the extension bar (31) are respectively rotatably connected to two sides of the rotation shaft (12), and the extension bar (31) can abut against the rotation bar (241).

3. A limit switch according to claim 2, characterized in that: A limiting rod (13) is provided on the housing (1), an extension block (311) is provided on the extension bar (31), and the limiting rod (13) is located on the rotation path of the extension block (311); when the moving contact piece (3) abuts against the stationary contact piece (4), the extension block (311) abuts against the limiting rod (13).

4. The limit switch according to claim 1, characterized in that: A rotating rod (24) is provided on the rotating bar (241), the rotating bar (241) is rotatably connected to the rotating rod (24), and a fixing assembly (5) is provided on the rotating rod (24), and the fixing assembly (5) is used to fix the rotating rod (24) to the housing (1).

5. A limit switch according to claim 4, characterized in that: The fixing assembly (5) comprises a fixing bar (51) and a fixing spring (52); the housing (1) is provided with a through hole (15) for the rotating rod (24) to pass through; the rotating rod (24) is provided with a fixing hole (243) for the fixing bar (51) to be inserted into; the fixing spring (52) drives the fixing bar (51) to be inserted into the fixing hole (243); when the fixing bar (51) is inserted into the fixing hole (243), the rotating rod (24) is fixed to the housing (1).

6. A limit switch according to claim 5, characterized in that: The housing (1) is slidably connected to a receiving bar (161), and the fixing bar (51) is located on a sliding path of the receiving bar (161); when the receiving bar (161) abuts against the fixing bar (51), the fixing bar (51) does not abut against the rotating rod (24).

7. A limit switch according to claim 6, characterized in that: A movable groove (151) is provided on the inner wall of the through hole (15), a movable bar (153) is provided in the movable groove (151), the movable bar (153) is arranged on the accommodating bar (161), a movable spring (152) is provided in the movable groove (151), and the movable spring (152) drives the movable bar (153) to be inserted into the through hole (15); when the movable bar (153) is located in the through hole (15), the accommodating bar (161) abuts against the fixed bar (51); when the movable bar (153) is completely located in the movable groove (151), the accommodating bar (161) does not abut against the fixed bar (51).

8. The limit switch according to claim 7, characterized in that: A moving inclined surface (154) is provided on the surface of the moving bar (153), and the distance between the moving inclined surface (154) and the moving spring (152) gradually increases along the direction from the rotating bar (241) to the moving bar (153), and the moving inclined surface (154) is located in the insertion path of the rotating rod (24).

9. The limit switch according to claim 1, characterized in that: The housing (1) is provided with an isolation plate (11), the driving member (2) passes through the isolation plate (11), the movable contact piece (3) and the stationary contact piece (4) are both located on one side of the isolation plate (11), the housing (1) is provided with a button (21), the driving member (2) is provided with a driving gear (22), the button (21) and the driving gear (22) are engaged with each other, and the button (21) is located on a side of the isolation plate (11) away from the movable contact piece (3) and the stationary contact piece (4); when the button (21) moves, the button (21) drives the driving member (2) to rotate via the driving gear (22).

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