High-safety rocker arm type travel switch

Abstract

The utility model discloses a high-safety rocker arm type travel switch which comprises a switch body and a rocker arm assembly, a trigger piece is installed on the switch body and connected with the rocker arm assembly, an abutting column facing the switch body is installed in the trigger piece, and a trigger supporting spring is arranged between the abutting column and the switch body. A contact core is arranged in the switch body and comprises a movable contact bridge, static contacts and a connecting rod, the movable contacts are fixed to the two ends of the movable contact bridge respectively and movably connected with the static contacts in a matched mode, the connecting rod is perpendicularly connected with the movable contact bridge in an inserted mode, the connecting rod and the abutting column are aligned in the axial direction, and a fixing block is fixed to the periphery of the connecting rod. And the contact supporting spring is arranged between the fixed block and the inner wall of the contact core, and two spring resistances of the triggering supporting spring and the contact supporting spring are added, so that the triggering swing rod is more difficult to collide by mistake in a vibration environment, and the possibility of false triggering is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of travel switches, in particular to a high-safety rocker arm type travel switch. BACKGROUND

[0002] In modern industrial automation and mechanical equipment, it is crucial to accurately monitor and control the running state of the equipment. As a commonly used electrical component, the travel switch is widely used in position detection and control of various mechanical equipment.

[0003] As disclosed in the authorized number CN221613768U, a rocker arm type travel switch mechanical structure, when working, the striker on the production mechanical moving part collides with the roller to make the trigger pendulum rod rotate, thereby driving the first shaft to rotate, under the cooperation of the first shaft, the first connecting rod, the second shaft, the first bearing, the sleeve and the second connecting rod, the third connecting rod moves up and down, under the cooperation of the third connecting rod and the spring, thereby making the contact bridge move up and down, making the normally closed contact break and the normally open contact close, sending the on-off signal to disconnect or connect some circuits, so as to achieve the purpose of control.

[0004] However, in actual use, especially in a vibrating environment, the trigger pendulum rod is prone to unnecessary vibration or shaking due to mechanical vibration. Such vibration may cause the trigger pendulum rod to come into unintended contact (accidental collision) with the roller or other components, which in turn triggers the up and down movement of the third connecting rod. Ultimately, it leads to the accidental action (accidental break or accidental close) of the contact bridge, thereby causing the accidental start or accidental opening of the travel switch. UTILITY MODEL CONTENT

[0005] In order to avoid accidental collision of the trigger pendulum rod in a vibrating environment, a high-safety rocker arm type travel switch is provided.

[0006] The above application purpose of the present application is achieved by the following technical scheme:

[0007] A high-safety rocker arm type travel switch, comprising a switch body and a rocker arm assembly, a trigger piece is mounted on the switch body, the trigger piece is connected with the rocker arm assembly, a pressing column is installed in the trigger piece towards the switch body, and a trigger support spring is arranged between the pressing column and the switch body, a fixed hole is opened in the switch body for the pressing column to pass through, a contact core is arranged in the switch body, the contact core comprises a movable contact bridge, a static contact and a connecting rod, the two ends of the movable contact bridge are fixed with the movable contacts, and are respectively connected with the static contact in movable cooperation, the connecting rod is inserted with the movable contact bridge perpendicularly, the connecting rod is aligned with the pressing column in the axial direction, a fixed block is fixed on the outer periphery of the connecting rod, and a contact support spring is arranged between the fixed block and the inner wall of the contact core.

[0008] By adopting the technical scheme, when the mechanical moving part collides with the rocker arm assembly, the resistance of the trigger support spring and the contact support spring needs to be overcome in the collision process, the double-spring design increases the required force for triggering, makes it more difficult for the trigger swing rod to be mistakenly collided in the vibration environment, thereby reducing the possibility of mistaken triggering, the newly added contact support spring can also absorb and buffer vibration energy, reduce the influence of vibration on the trigger swing rod, reduce the risk of mistaken triggering, improve the stability of the entire mechanical structure, and ensure normal work in the vibration environment.

[0009] Optionally, a buffer spring is installed between the connecting rod and the movable contact bridge for fixation, and two ends of the buffer spring are respectively in abutment with the connecting rod and the movable contact bridge.

[0010] By adopting the technical scheme, the buffer spring can absorb the energy generated by mechanical vibration or impact, reduce the direct collision between the connecting rod and the movable contact bridge, effectively reduce the risk of damage to the mechanical part due to impact, and at the same time, when the movable contact bridge drives the movable contact to contact and separate from the static contact, the buffer spring can play a buffering role, prolonging the service life of the contact.

[0011] Optionally, a limiting protrusion is fixed on the connecting rod, a limiting protruding block is fixed on the movable contact bridge, and two ends of the buffer spring are respectively clamped with the limiting protrusion and the limiting protruding block.

[0012] By adopting the technical scheme, compared with the structure that two ends of the buffer spring are respectively fixedly connected with the connecting rod and the movable contact bridge, the structure that the limiting protrusion and the limiting protruding block are clamped with the buffer spring facilitates replacement of the buffer spring.

[0013] Optionally, a fixing ring is installed in the switch body, the fixing ring is located at the outer periphery of one end of the pressing column inserted into the switch body, a ring groove is opened on the side of the fixing ring facing the trigger, and one end of the trigger support spring is fitted and embedded in the ring groove.

[0014] By adopting the technical scheme, the fixing ring can prevent the trigger support spring from deviating during movement, limit the lateral movement of the trigger support spring, prevent unnecessary shaking of the trigger support spring when vibrating or impacting, improve the stability of the trigger support spring, and enhance the reliability of the entire formed switch.

[0015] Optionally, a rotating shaft and a support frame are installed in the trigger, an abutment surface is arranged on the rotating shaft, and the abutment surface and the upper top surface of the support frame are mutually fitted.

[0016] By adopting the technical scheme, the abutting surface is in contact with the upper top surface of the support frame, which can increase the contact area between the rotating shaft and the support frame, the larger contact area can disperse stress, reduce stress concentration caused by point contact, and reduce vibration or shaking caused by the non-smooth contact surface during rotation of the rotating shaft, thereby improving the operation stability of the entire mechanical structure and reducing the possibility of false triggering.

[0017] Optionally, the rotating shaft is further provided with a turning surface, the turning surface is connected with the abutting surface, and the included angle between the turning surface and the abutting surface is 90° to 180°.

[0018] By adopting the technical scheme, after the striker on the mechanical moving part collides with the rocker arm assembly, the existence of the turning surface can ensure that the contact between the rotating shaft and the upper top surface of the support frame is more stable, so that the pressure column can better bear stress, thereby improving the stability and durability of the mechanical structure.

[0019] Optionally, a limiting sheet is fixed on the periphery of the support frame towards the side of the switch body, and the limiting sheet is located at the outer periphery of the trigger support spring.

[0020] By adopting the technical scheme, the limiting sheet can prevent the trigger support spring from being offset in the radial direction. When the trigger support spring is compressed or stretched, it may have a radial displacement, so as to ensure that the trigger support spring is always in the correct position.

[0021] Optionally, a rubber pad is installed between the trigger and the switch body.

[0022] By adopting the technical scheme, the rubber pad can absorb the impact force generated between the trigger and the switch body, reduce the rigid collision between mechanical parts, effectively reduce the damage of vibration and impact to the mechanical structure, and improve the service life of the travel switch.

[0023] Optionally, a limiting block is further fixed on the outer periphery of the connecting rod, and the limiting block is in abutment with the inner wall of the contact core.

[0024] By adopting the technical scheme, the limiting block can prevent the connecting rod from moving upward excessively when the elastic potential energy of the contact support spring is released. By abutting with the inner wall of the contact core, the limiting block sets the highest position of the connecting rod, avoids exceeding the design range, and prevents damage or jamming of mechanical parts caused by excessive movement.

[0025] In summary, the present application has at least the following beneficial effects:

[0026] 1. The cooperative action of the trigger support spring and the contact support spring reduces the movement fluctuation of the pressure column and the connecting rod, makes the contact between the moving contact and the stationary contact in the contact core more stable, and avoids false triggering caused by vibration or impact.

[0027] 2. The buffer spring can absorb the energy generated by mechanical vibration or impact, and can play a buffering role when the moving contact bridge drives the moving contact to contact and separate from the static contact, prolonging the service life of the contact. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The overall structure of the high-safety rocker arm type travel switch is shown in the schematic diagram.

[0029] Figure 2 The Figure 1 cutaway view of the Figure 1 ;

[0030] Figure 3 The Figure 1 cutaway view of the Figure 2 ;

[0031] Figure 4 The cutaway view of the contact core Figure 1 ;

[0032] Figure 5 The cutaway view of the contact core Figure 2 .

[0033] Reference signs: 1, trigger; 11, trigger cavity; 12, support frame; 121, limiting piece; 13, rotating shaft; 131, turning surface; 132, abutting surface; 14, pressing column; 15, trigger support spring; 2, rocker arm assembly; 21, connecting piece; 22, anti-slip fixing piece; 23, trigger swing lever; 231, clamping groove; 232, roller; 3, switch body; 31, limiting groove; 32, fixed ring; 321, ring groove; 33, fixed groove; 4, rubber pad; 5, contact core; 51, moving contact bridge; 511, moving contact; 512, through hole; 513, limiting protrusion; 52, static contact; 521, normally open contact; 522, normally closed contact; 53, connecting rod; 531, fixed block; 532, limiting block; 533, limiting protrusion; 54, buffer spring; 55, contact support spring. DETAILED DESCRIPTION

[0034] Further details are described below in conjunction with the accompanying drawings:

[0035] As shown in the accompanying Figure 1 and the accompanying Figure 2 , a high-safety rocker arm type travel switch includes a trigger 1, a rocker arm assembly 2, and a switch body 3.

[0036] The trigger element 1 is fixedly connected to the upper end of the switch body 3. The trigger element 1 has a trigger cavity 11 inside. The trigger cavity 11 is equipped with a support frame 12 and a rotating shaft 13. The rotating shaft 13 is cylindrical and is located above the support frame 12. One end of the rotating shaft 13 inside the trigger element 1 is provided with an abutment surface 132. The abutment surface 132 and the upper top surface of the support frame 12 are both flat, and the abutment surface 132 and the upper top surface of the support frame 12 fit together, increasing the contact area between the rotating shaft 13 and the support frame 12. The other end of the rotating shaft 13 passes through the trigger element 1 and is connected to the rocker arm assembly 2.

[0037] The rotating shaft 13 is also provided with a turning surface 131. The turning surface 132 is connected to the abutment surface 131, and the angle between the turning surface 131 and the abutment surface 132 is 90° to 180°, preferably 45°. After the collision block on the mechanical moving part hits the rocker arm assembly 2, the presence of the turning surface 131 can ensure that the contact between the rotating shaft 13 and the upper top surface of the support frame 12 is more stable, so that the pressure column 14 can be better stressed, thereby improving the stability and durability of the mechanical structure.

[0038] The rocker arm assembly 2 includes a connector 21 and an anti-slip fixing component 22. The connector 21 is perpendicularly connected to the rotating shaft 13. A vertical trigger lever 23 is installed on the side of the connector 21 facing away from the rotating shaft 13. The connector 21 and the trigger lever 23 are fixedly connected by the anti-slip fixing component 22. The trigger lever 23 has slots 231 on both sides. A roller 232 is fixedly connected to the upper end of the trigger lever 23.

[0039] As attached Figure 2 and attached Figure 3 As shown, the trigger 1 is also equipped with a pressing post 14 and a trigger support spring 15. The pressing post 14 is cylindrical in shape. One end of the pressing post 14 is fixedly connected to the side of the support frame 12 facing the switch body 3, and the other end extends vertically downward and is located inside the switch body 3. The trigger support spring 15 is located on the outer periphery of the pressing post 14, and one end of the trigger support spring 15 abuts against the side of the support frame 12 facing the switch body 3, and the other end abuts against the switch body 3.

[0040] A vertical limiting piece 121 is fixed circumferentially on the side of the support frame 12 facing the switch body 3. The limiting piece 121 is annular in shape and there are multiple limiting pieces 121. The multiple limiting pieces 121 are located on the outer periphery of the trigger support spring 15. The limiting piece 121 can restrict the radial movement of the trigger support spring 15, prevent the trigger support spring 15 from having unnecessary contact or friction with the support frame 12 or other components, and protect the trigger support spring 15 and surrounding components from wear or damage.

[0041] The switch body 3 is fixedly connected to the lower end of the trigger 1. A rubber pad 4 is installed between the trigger 1 and the switch body 3. The rubber pad 4 can absorb the impact force generated between the trigger 1 and the switch body 3, reduce the rigid collision between mechanical parts, and improve the stability of the mechanical structure.

[0042] The switch body 3 has a limiting groove 31 that communicates with the trigger cavity 11. The end of the pressing column 14 facing away from the support frame 12 is located in the limiting groove 31. A fixing ring 32 is installed at the bottom of the limiting groove 31. The fixing ring 32 is made of elastic material. The side of the fixing ring 32 facing the trigger 1 has an annular groove 321. One end of the trigger support spring 15 abuts against the support frame 12, and the other end fits into the annular groove 321. The fixing ring 32 can prevent the trigger support spring 15 from shifting during movement, ensuring that the trigger support spring 15 is always in the correct position and maintaining a stable buffering effect.

[0043] As attached Figure 3 and attached Figure 4 As shown, the switch body 3 also has a fixing groove 33 that communicates with the limiting groove 31. The contact core 5 is installed in the fixing groove 33. The contact core 5 includes a moving contact bridge 51, a stationary contact 52, a connecting rod 53, a buffer spring 54, and a contact support spring 55.

[0044] As attached Figure 4 and attached Figure 5 As shown, the stationary contact 52 includes a normally open contact 521 and a normally closed contact 522. The normally open contact 521 and the normally closed contact 522 are parallel to each other. The normally open contact 521 is located below the normally closed contact 522. The moving contact bridge 51 is located between the normally open contact 521 and the normally closed contact 522. Moving contacts 511 are fixed at both ends of the moving contact bridge 51. A through hole 512 is opened in the middle of the moving contact bridge 51, and two limiting protrusions 513 are fixed on two opposite side walls inside the through hole 512.

[0045] The connecting rod 53 is cylindrical in shape. One end of the connecting rod 53 passes through the contact core 5, and the other end passes through the through hole 512 of the moving contact bridge 51 and is located inside the contact core 5. The connecting rod 53 is aligned with the pressing column 14 in the axial direction.

[0046] A fixing block 531 is fixed on the connecting rod 53. The fixing block 531 is located on the side of the moving contact bridge 51 facing the normally open contact 521. The contact support spring 55 is located on the outer periphery of the connecting rod 53, and the two ends of the contact support spring 55 abut against the fixing block 531 and the inner wall of the contact core 5, respectively.

[0047] The connecting rod 53 is further fixed with a limiting block 532 located on the side of the movable contact bridge 51 facing the normally closed contact 522, and the limiting block 532 abuts against the inner wall of the contact core 5. When the elastic potential energy stored by the contact support spring 55 is released, the connecting rod 53 is driven to move upward, and the limiting block 532 abuts against the inner wall of the contact core 5. The limiting block 532 can limit the movement range of the connecting rod 53 to prevent it from moving upward excessively.

[0048] The connecting rod 53 is further fixed with two opposite parallel limiting protrusions 533, which are arc-shaped. The two limiting protrusions 533 are located in the through hole 512 of the movable contact bridge 51, and the two limiting protrusions 533 are opposite to the two limiting blocks 513, respectively. The number of the buffer springs 54 is two, and the two buffer springs 54 are located in the through hole 512 of the movable contact bridge 51, and the two buffer springs 54 are respectively clamped with the limiting protrusions 533 and the limiting blocks 513. Thus, the movable contact bridge 51 is fixed on the connecting rod 53, so that the movable contact bridge 51 moves synchronously with the connecting rod 53. When the movable contact bridge 51 drives the movable contact 511 to contact or separate from the normally open contact 521 and the normally closed contact 522, the buffer spring 54 can play a buffering role to prolong the service life of the contact.

[0049] Working principle:

[0050] In work, the movable roller 232 is hit by the bump on the production mechanical moving part to make the trigger pendulum rod 23 rotate, thereby driving the rotating shaft 13 to rotate. Under the cooperation of the rotating shaft 13 and the support frame 12, the rotating shaft 13 drives the support frame 12 to move downward to press the pressing column 14, thereby the pressing column 14 abuts against the connecting rod 53. With the increase of the pressing force, the pressing column 14 presses the connecting rod 53 to move downward, thereby driving the movable contact bridge 51 to move downward, so that the movable contact 511 at both ends of the movable contact bridge 51 is separated from the normally closed contact 522, and the movable contact 511 at both ends of the movable contact bridge 51 is contacted with the normally open contact 521, thereby emitting an on-off signal to disconnect or connect some circuits to achieve the purpose of control.

[0051] The specific embodiment is only an explanation of the application, which is not a limitation of the application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the application, it is protected by the patent law.

Claims

1. A high-safety rocker arm type limit switch, comprising a switch body (3) and a rocker arm assembly (2), wherein a trigger element (1) is mounted on the switch body (3), the trigger element (1) is connected to the rocker arm assembly (2), a pressing post (14) facing the switch body (3) is installed inside the trigger element (1), and a trigger support spring (15) is provided between the pressing post (14) and the switch body (3), characterized in that, The switch body (3) has a fixing hole for the pressure column (14) to pass through. The switch body (3) is provided with a contact core (5). The contact core (5) includes a moving contact bridge (51), a stationary contact (52) and a connecting rod (53). Both ends of the moving contact bridge (51) are fixed with moving contacts (511) and are movably connected to the stationary contact (52). The connecting rod (53) is perpendicularly inserted into the moving contact bridge (51). The connecting rod (53) and the pressure column (14) are aligned in the axial direction. A fixing block (531) is fixed on the outer periphery of the connecting rod (53), and a contact support spring (55) is provided between the fixing block (531) and the inner wall of the contact core (5).

2. The high-safety rocker-arm limit switch according to claim 1, characterized in that, A buffer spring (54) is installed between the connecting rod (53) and the moving contact bridge (51) for fixing. The two ends of the buffer spring (54) abut against the connecting rod (53) and the moving contact bridge (51) respectively.

3. The high-safety rocker-arm limit switch according to claim 1, characterized in that, A limiting protrusion (533) is fixed on the connecting rod (53), and a limiting protrusion (513) is fixed on the moving contact bridge (51). The two ends of the buffer spring (54) are respectively engaged with the limiting protrusion (533) and the limiting protrusion (513).

4. A high-safety rocker-arm limit switch according to claim 1, characterized in that, A fixing ring (32) is installed inside the switch body (3). The fixing ring (32) is located on the outer periphery of one end of the pressure post (14) inserted into the switch body (3). The fixing ring (32) has a ring groove (321) on the side facing the trigger (1), and one end of the trigger support spring (15) is fitted and embedded in the ring groove (321).

5. A high-safety rocker-arm limit switch according to claim 1, characterized in that, The trigger (1) is equipped with a rotating shaft (13) and a support frame (12). The rotating shaft (13) is provided with an abutting surface (132), and the abutting surface (132) is in contact with the top surface of the support frame (12).

6. A high-safety rocker-arm limit switch according to claim 5, characterized in that, The rotating shaft (13) is also provided with a turning surface (131), which is connected to the abutment surface (132), and the included angle between the turning surface (131) and the abutment surface (132) is 90° to 180°.

7. A high-safety rocker-arm limit switch according to claim 5, characterized in that, The support frame (12) has a limiting piece (121) fixed in the circumferential direction on the side facing the switch body (3), and the limiting piece (121) is located on the outer periphery of the trigger support spring (15).

8. A high-safety rocker-arm limit switch according to claim 1, characterized in that, A rubber pad (4) is installed between the trigger (1) and the switch body (3).

9. A high-safety rocker-arm limit switch according to claim 1, characterized in that, A limiting block (532) is also fixed on the outer periphery of the connecting rod (53), and the limiting block (532) abuts against the inner wall of the contact core (5).

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