Novel proximity limit switch

Abstract

The utility model is used for the technical field of limit switch, disclose a kind of novel proximity limit switch, including base, the one end side surface of base is fixedly set with limit rod, the upper surface of base is fixedly set with support plate, the surface of base is provided with the mechanism of abutting and unlocking, by the mode of displacement piece push unlocking, so that when displacement piece out of control is not timely stop, it can automatically turn down, reduce the possibility that displacement piece impacts photoelectric sensor.The novel proximity limit switch, by setting the mechanism of abutting and unlocking, when displacement piece out of control is not timely stop, will push movable rod, so that the flap that is engaged with movable rod automatically turns down, to drive mounting bracket and photoelectric sensor installed on it to avoid displacement piece, greatly reduce the possibility that displacement piece impacts photoelectric sensor, effectively protect key detection element, reduce equipment maintenance cost and downtime, guarantee the continuity of industrial production.

Description

Technical Field

[0001] This utility model relates to the field of limit switch technology, specifically a novel proximity limit switch. Background Technology

[0002] In modern industrial automation production, proximity limit switches, as key position detection components, are widely used in the operation control and safety protection of various mechanical equipment. Their main function is to detect the proximity of the displacement component and trigger signal feedback, thereby achieving precise control of the equipment's operating position and preventing equipment from malfunctioning or causing safety accidents due to overtravel. However, existing proximity limit switches still have many shortcomings in practical applications. On the one hand, when the displacement component goes out of control and fails to stop in time, it is very easy to directly impact the sensing component of the limit switch, causing damage to the sensing component. This not only affects the normal operation of the equipment but also increases maintenance costs and downtime. On the other hand, the photoelectric sensor in the limit switch may fail due to dust accumulation, component aging, or other reasons. Once the photoelectric sensor fails, it cannot be triggered normally when the displacement component reaches its position, and the equipment will lose effective limit control, which may lead to production accidents or equipment damage. Therefore, it is urgent to develop a new type of proximity limit switch that can automatically protect against loss of control of the displacement component and has sensor failure detection function to improve the safety and reliability of industrial automated production. Utility Model Content

[0003] The purpose of this utility model is to provide a novel proximity limit switch to solve the problems mentioned in the background art, such as the easy impact damage to the sensing component when the displacement component goes out of control, and the failure of the photoelectric sensor to detect the failure in time, which leads to the failure of the limit control.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a novel proximity limit switch, comprising a base, a limit rod fixedly disposed on one side surface of the base, a support plate fixedly disposed on the upper surface of the base, and a rotating flap mounted on the lower side surface of the support plate, a mounting bracket fixedly disposed on the upper end of the flap, and a photoelectric sensor being snapped onto the outer surface of the mounting bracket, a control module fixedly disposed on one side upper surface of the base, the control module being electrically connected to the photoelectric sensor via a wire, and an anti-unlocking mechanism disposed on the surface of the base, which unlocks by pushing with a displacement component, so that it can automatically flip downwards when the displacement component is out of control and does not stop in time, reducing the possibility of the displacement component hitting the photoelectric sensor; The resisting unlocking mechanism includes: a movable rod, which is slidably installed on the upper surface of one end of the base, and a limit baffle is fixedly provided on the upper surface of one end of the base where the movable rod is located; an electric push rod is fixedly installed on the upper surface of the middle section of the base, and a reset plate is fixedly connected to the end of the electric push rod facing the flip plate. The outer surface of the limiting rod on one side is provided with a failure detection mechanism. By intermittently blocking the photoelectric sensor, the failure of the photoelectric sensor can be detected in time, reducing the possibility that the photoelectric sensor cannot be triggered when the displacement component is in place. The failure detection mechanism includes: a rotating wheel, which is rotatably mounted on the outer surface of a limiting rod on one side, and a stop bar is fixedly provided on the outer surface of the rotating wheel. A motor is fixedly mounted on the outer surface of another limiting rod on the same side as the rotating wheel, and a drive gear is fixedly connected to one end of the output shaft of the motor.

[0005] Preferably, a spring is connected between the support plate and the flap, and a groove is provided on the upper side surface of the flap, and the flap is engaged with the movable rod through the groove.

[0006] Using the above technical solution, the spring connecting the support plate and the flap is kept in a compressed state, so that the flap can rotate quickly when it loses its limit. The flap is installed by engaging with the movable rod through a groove, so that the flap can be unlocked and flipped when the movable rod is pushed, thus realizing the protection function of the photoelectric sensor.

[0007] Preferably, a spring connects the movable rod and the limiting baffle, and the limiting baffle has an L-shaped design. One end of the movable rod protrudes from the end face of the limiting rod, and the distance between the end of the limiting baffle facing the movable rod and the movable rod is equal to the distance the movable rod protrudes from the end face of the limiting rod.

[0008] Using the above technical solution, the spring between the movable rod and the limiting baffle provides a restoring force to the movable rod, so that it can automatically return to its initial position after the force of the displacement component disappears. The L-shaped limiting baffle, with a specific distance design, precisely limits the sliding stroke of the movable rod, ensuring that the flap triggers the flipping action under appropriate displacement and maintains consistent support with the limiting rod, effectively protecting the photoelectric sensor.

[0009] Preferably, the upper surface of the reset plate is flush with the lower surface of the flip plate, and the end of the reset plate facing the flip plate is designed as a right-angled trapezoid, and the inclined surface of the right-angled trapezoidal end of the flip plate faces upward toward the lower surface of the flip plate.

[0010] The above technical solution is adopted, with the upper surface of the reset plate flush with the lower surface of the flip plate, which facilitates the contact between the reset plate and the flip plate and pushes it to reset. The inclined surface design of the right trapezoidal structure can lift the flip plate smoothly with less resistance when the reset plate moves, ensuring that the flip plate returns to the horizontal detection position smoothly and ensuring that the limit switch can work repeatedly and stably.

[0011] Preferably, the outer surface of the rotating wheel is uniformly provided with toothed blocks, and the rotating wheel and the limiting rod are concentrically designed.

[0012] The above technical solution uses evenly arranged toothed blocks on the outer side of the wheel to precisely mesh with the drive gear, ensuring the stability and transmission efficiency of the wheel's rotation. The wheel and the limit rod are designed to be concentric, so that the stop rod can stably and regularly pass through the photoelectric sensor detection area during rotation, providing reliable periodic blocking conditions for failure detection.

[0013] Preferably, the drive gear is connected to the rotating wheel through a toothed block provided on the outer surface of the rotating wheel.

[0014] By adopting the above technical solution, the drive gear meshes with the outer tooth block of the rotating wheel, efficiently transmitting the rotational power of the motor to the rotating wheel, thereby enabling the rotating wheel to rotate. This ensures that the stop lever can stably and regularly block the photoelectric sensor intermittently, thus detecting the working status of the photoelectric sensor in a timely and accurate manner.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This novel proximity limit switch: 1. By setting up a resisting unlocking mechanism, when the displacement component goes out of control and does not stop in time, it will push the movable rod, causing the flap that is engaged with the movable rod to automatically flip downward, thereby driving the mounting bracket and the photoelectric sensor installed on it to avoid the displacement component. This greatly reduces the possibility of the displacement component hitting the photoelectric sensor, effectively protects the key detection components, reduces equipment maintenance costs and downtime, and ensures the continuity of industrial production. 2. The design of the failure detection mechanism utilizes a rotating wheel installed on the outer surface of a limit rod on one side and a stop bar on its outer surface to intermittently block the photoelectric sensor. This allows for timely detection of photoelectric sensor failures. Once the sensor malfunctions and cannot respond normally to the blocking action, it can be detected quickly. This avoids the failure of the displacement component to trigger the limit control when it reaches its position due to sensor failure, significantly improving the safety of equipment operation and reducing the probability of production accidents. 3. The coordinated structure of the springs connecting the support plate and the flap, and the springs connecting the movable rod and the limit baffle, allows the flap to quickly reset under the action of the electric push rod installed on the base and its connected reset plate after completing the protective action. This ensures that the limit switch can work repeatedly and stably. The shape design of the right-angled trapezoidal structure of the reset plate and other components optimizes the smoothness of mechanical transmission, further improving the reliability and practicality of the limit switch, and comprehensively enhancing the safety and reliability of industrial automated production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the movable rod and the limiting baffle of this utility model; Figure 3 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the flap and the support plate of this utility model; Figure 4 This is a three-dimensional structural diagram showing the connection between the base, electric push rod, and reset plate of this utility model. Figure 5 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the flap and the movable rod of this utility model; Figure 6 This is a three-dimensional structural diagram of the overall working state of this utility model.

[0017] In the diagram: 1. Base; 2. Limiting rod; 3. Flip plate; 4. Mounting bracket; 5. Photoelectric sensor; 6. Support plate; 7. Movable rod; 8. Limiting baffle; 9. Control module; 10. Electric push rod; 11. Reset plate; 12. Rotary wheel; 13. Stop bar; 14. Motor; 15. Drive gear. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-6 This utility model provides a technical solution: a novel proximity limit switch.

[0020] Example 1: This example discloses: a base 1, a limit rod 2 fixedly installed on one side surface of the base 1, a support plate 6 fixedly installed on the upper surface of the base 1, and a rotating flap 3 installed on the lower side surface of the support plate 6, a mounting frame 4 fixedly installed on the upper end of the flap 3, and a photoelectric sensor 5 snapped onto the outer surface of the mounting frame 4, a control module 9 fixedly installed on the upper surface of one end of the base 1, and the control module 9 is electrically connected to the photoelectric sensor 5 through a wire, and a contact unlocking mechanism is provided on the surface of the base 1, which can automatically flip downwards when the displacement component is out of control and does not stop in time by pushing the unlocking mechanism, thereby reducing the possibility of the displacement component hitting the photoelectric sensor 5; The resisting unlocking mechanism includes: a movable rod 7, which is slidably installed on the upper surface of one end of the base 1, and a limit baffle 8 is fixedly provided on the upper surface of one end of the base 1 where the movable rod 7 is located. An electric push rod 10 is fixedly installed on the upper surface of the middle section of the base 1, and a reset plate 11 is fixedly connected to the end of the electric push rod 10 facing the flip plate 3. A spring connects the support plate 6 and the flap 3, and a groove is provided on the upper side surface of the flap 3, and the flap 3 is engaged with the movable rod 7 through the groove. A spring connects the movable rod 7 and the limiting baffle 8, and the limiting baffle 8 is designed in an L shape. One end of the movable rod 7 protrudes from the end face of the limiting rod 2, and the distance between the end of the limiting baffle 8 facing the movable rod 7 and the movable rod 7 is equal to the distance of the movable rod 7 protruding from the end face of the limiting rod 2. The upper surface of the reset plate 11 is flush with the lower surface of the flip plate 3, and the end of the reset plate 11 facing the flip plate 3 is designed as a right-angled trapezoid, and the inclined surface of the right-angled trapezoidal end of the flip plate 3 is set upwards and facing the lower surface of the flip plate 3. When the displacement component is running normally and approaches the limit switch, the photoelectric sensor 5 installed on the upper end of the mounting bracket 4 detects the displacement component and sends a signal to the control module 9 to realize the limit control of the equipment. If the displacement component loses control and does not stop in time and continues to move forward, it will first contact and push the movable rod 7 to slide towards the limit baffle 8. Since the movable rod 7 and the flip plate 3 are engaged by the groove, and the spring between the support plate 6 and the flip plate 3 is compressed, when the movable rod 7 slides to a certain distance, the flip plate 3 is released from the engagement restriction of the movable rod 7 and flips downward under its own weight and spring support, causing the photoelectric sensor 5 to move down to avoid the displacement component and prevent it from being damaged by impact. When a reset is required, the electric push rod 10 on the upper surface of the base 1 is activated to push the reset plate 11 toward the flip plate 3. The right-angled trapezoidal inclined surface of the reset plate 11 first contacts the lower surface of the flip plate 3. As the reset plate 11 continues to move forward, the inclined surface gradually lifts the flip plate 3 to a horizontal position. During the upward flipping process, the flip plate 3 squeezes the movable rod 7, causing the movable rod 7 to slide and stretch the spring between it and the limit baffle 8 until the flip plate 3 rotates into place. At this time, the movable rod 7 is reset under the action of the spring between it and the limit baffle 8, and re-engages with the flip plate 3, completing the reset of the limit switch.

[0021] Example 2: This example discloses, based on Example 1, that a failure detection mechanism is provided on the outer surface of one side limit rod 2. By intermittently blocking the photoelectric sensor 5, the failure of the photoelectric sensor 5 can be detected in time, reducing the possibility that the photoelectric sensor 5 cannot be triggered when the displacement component is in place. The failure detection mechanism includes: a rotating wheel 12, which is rotatably mounted on the outer surface of a limit rod 2 on one side, and a stop rod 13 is fixedly provided on the outer surface of the rotating wheel 12. A motor 14 is fixedly mounted on the outer surface of another limit rod 2 on the same side as the rotating wheel 12, and a drive gear 15 is fixedly connected to one end of the output shaft of the motor 14. The outer surface of the rotating wheel 12 is evenly provided with toothed blocks, and the rotating wheel 12 and the limiting rod 2 are concentrically designed; The drive gear 15 is connected to the rotating wheel 12 by a toothed block provided on the outer surface of the rotating wheel 12; The failure detection mechanism is driven by motor 14 to drive gear 15 to rotate. The drive gear 15 meshes with the outer tooth block of the rotating wheel 12, causing the rotating wheel 12 to rotate concentrically around the limit rod 2. When the rotating wheel 12 rotates, the outer stop rod 13 will pass through the detection area of ​​the photoelectric sensor 5, forming a blockage of the photoelectric sensor 5. Then the motor 14 drives the drive gear 15 to rotate in the opposite direction to reset the stop rod 13. Under normal operating conditions, the photoelectric sensor 5 will generate corresponding signal changes as the stop lever 13 is blocked and removed, and transmit these signals to the control module 9. The control module 9 analyzes whether these signals change normally to determine whether the photoelectric sensor 5 is in an effective working state. If the photoelectric sensor 5 fails, its signal will not change with the block lever 13, and the control module 9 will issue an alarm in time to remind the staff to carry out maintenance, so as to avoid the equipment losing limit control due to sensor failure.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel proximity limit switch, comprising a base (1), wherein a limit rod (2) is fixedly disposed on one end side surface of the base (1), characterized in that: A support plate (6) is fixedly provided on the upper surface of the base (1), and a rotating flip plate (3) is installed on the lower side surface of the support plate (6). A mounting bracket (4) is fixedly provided on the upper end of the flip plate (3), and a photoelectric sensor (5) is installed on the outer surface of the mounting bracket (4). A control module (9) is fixedly installed on the upper surface of one end of the base (1). The control module (9) is electrically connected to the photoelectric sensor (5) through a wire. A contact unlocking mechanism is provided on the surface of the base (1). The mechanism is unlocked by pushing the displacement component, so that it can automatically flip downward when the displacement component is out of control and does not stop in time, thereby reducing the possibility of the displacement component hitting the photoelectric sensor (5). The resisting unlocking mechanism includes: a movable rod (7), which is slidably installed on the upper surface of one end of the base (1), and a limit baffle (8) is fixedly provided on the upper surface of one end of the base (1) where the movable rod (7) is located. An electric push rod (10) is fixedly installed on the upper surface of the middle section of the base (1), and a reset plate (11) is fixedly connected to the end of the electric push rod (10) facing the flip plate (3).

2. The novel proximity limit switch according to claim 1, characterized in that: The outer surface of the limiting rod (2) on one side is provided with a failure detection mechanism. By intermittently blocking the photoelectric sensor (5), the failure of the photoelectric sensor (5) can be detected in time, reducing the possibility that the photoelectric sensor (5) cannot be triggered when the displacement component is in place. The failure detection mechanism includes: a rotating wheel (12), which is rotatably mounted on the outer surface of a limiting rod (2) on one side, and a stop rod (13) is fixedly provided on the outer surface of the rotating wheel (12). A motor (14) is fixedly mounted on the outer surface of another limiting rod (2) on the side where the rotating wheel (12) is located, and a drive gear (15) is fixedly connected to one end of the output shaft of the motor (14).

3. A novel proximity limit switch according to claim 1, characterized in that: A spring is connected between the support plate (6) and the flip plate (3), and a groove is provided on the upper side surface of the flip plate (3), and the flip plate (3) is engaged with the movable rod (7) through the groove.

4. A novel proximity limit switch according to claim 1, characterized in that: A spring connects the movable rod (7) and the limiting baffle (8), and the limiting baffle (8) is L-shaped. One end of the movable rod (7) protrudes from the end face of the limiting rod (2), and the distance between the end of the limiting baffle (8) facing the movable rod (7) and the movable rod (7) is equal to the distance of the movable rod (7) protruding from the end face of the limiting rod (2).

5. A novel proximity limit switch according to claim 1, characterized in that: The upper surface of the reset plate (11) is flush with the lower surface of the flip plate (3), and the end of the reset plate (11) facing the flip plate (3) is designed as a right trapezoid, and the inclined surface of the right trapezoidal end of the flip plate (3) is set upward towards the lower surface of the flip plate (3).

6. A novel proximity limit switch according to claim 2, characterized in that: The outer surface of the rotating wheel (12) is uniformly provided with tooth blocks, and the rotating wheel (12) and the limiting rod (2) are designed concentrically.

7. A novel proximity limit switch according to claim 2, characterized in that: The drive gear (15) is connected to the rotating wheel (12) by a tooth block provided on the outer surface of the rotating wheel (12).

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