Transmission type trigger sensor anti-overload protection device

Abstract

The invention discloses a transmission type trigger sensor anti-overload protection device, which realizes efficient, reliable and stable protection of the trigger type sensor from damage. The invention is realized by the following technical scheme: a screw sleeve with external threads and stepped inner holes is used to extend the trigger switch button of the energy absorption spring axially out of the through hole of the sliding sleeve, and constrained between the shrinking step hole of the sliding sleeve and the pressure block, and the pressure block holds the energy absorption spring in the sliding sleeve to form a pressing component; the spring seat ring on the sliding sleeve body positions the reset spring at the rear end of the sliding sleeve, and the adjustment washer sleeved on the step shaft at the rear end of the sensor is pressed on the step hole of the mounting seat, and the pressing component is under heavy load and impact environment, the load acts on the trigger switch button, the energy absorption spring absorbs the load energy, drives the pressure block to slide axially to the left, triggers the sensor, connects the signal, and the reset spring is compressed at the same time; the external load disappears, the reset spring drives the pressing component to reset, and the pressure block is separated from the sensor, thereby realizing the on and off of the signal.

Description

Technical Field

[0001] The present invention relates to a protection device mainly used to protect a trigger type sensor from damage, and in particular to a signal trigger protection device used to protect the trigger type sensor from overload and impact under impact conditions. Background Art

[0002] In various working conditions where the position signal needs to be detected, trigger sensors are widely used for status detection. Trigger sensors will inevitably encounter overload accidents during use. In order to ensure the safety of the sensor and the normal operation of the measurement system, sensor overload protection is essential. The traditional trigger method generally involves the moving parts acting on the sensor directly or through a transmission mechanism without overload protection to give a position signal. This traditional trigger method is used in a small load or no impact environment, and the signal trigger is direct and reliable; but its adjustment accuracy is required to be high. In order to prevent the displacement of the trigger point, the sensor design trigger stroke is exceeded, which is easy to damage the sensor. The instantaneous impact force is a severe test for the trigger sensor. This situation often requires more than 3 times the safety overload, but it will affect its comprehensive accuracy. Although damping devices can be used to reduce pressure shock, this will reduce the response speed of the sensor. In a heavy load and impact environment, even if the stroke is perfectly adjusted, the structural deformation caused by the heavy load and impact often causes the trigger sensor to be damaged due to over-travel. When the working environment of the trigger sensor is harsh, such as large vibration, impact, and large electromagnetic interference, more stringent requirements are placed on the sensor. Summary of the invention

[0003] In order to solve the problem of avoiding direct load action on the sensor under heavy load and impact environment, and at the same time eliminate the structural deformation caused by heavy load and impact affecting the reliability of signal triggering, and protect the trigger sensor from damage, the purpose of the present invention is to provide a signal trigger protection device that is efficient, reliable and stable to protect the trigger sensor from damage, so as to prevent the sensor from being damaged by overload and impact.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a transmission type trigger sensor anti-overload protection device, including a mounting seat for inserting an assembly hole and axially positioning the trigger sensor, and a screw sleeve coaxial with the trigger sensor is arranged inside, characterized in that: the screw sleeve is made with an external thread and a stepped inner hole, and a trigger switch button is equipped with an energy absorbing spring, which axially extends out of the sliding sleeve through hole and is constrained between the sliding sleeve necked step hole and the pressure block, thereby forming a pressing component; the spring seat ring on the sliding sleeve body positions the reset spring at the rear end of the sliding sleeve, and the adjusting washer mounted on the step shaft at the rear end of the trigger sensor is The pressing block is pressed on the step hole of the mounting seat; the pressing block keeps the energy absorption spring in the sliding sleeve, so that the preload force of the energy absorption spring is greater than the sum of the working pressure of the reset spring, the friction force of the sliding sleeve and the reset elastic force of the trigger sensor. When the pressing assembly is under heavy load and impact, the load acts on the trigger switch button, and the energy absorption spring absorbs the load energy, driving the pressing block to slide axially to the left, driving the trigger sensor, and connecting the sensor signal. At the same time, the reset spring is compressed, the external load disappears, the reset spring drives the pressing assembly to reset, and the pressing block is separated from the trigger sensor, thereby realizing the on and off of the contact end of the trigger sensor measuring head.

[0005] The present invention has the following advantages:

[0006] The present invention comprises a pressing assembly capable of axial movement in the screw sleeve, an energy absorbing spring with energy absorbing function is installed between the pressing block in the pressing assembly and the trigger switch button, and the reset spring is reset by the sliding sleeve to ensure that the compression stroke of the sensor remains constant, thereby protecting the sensor; when heavy load and impact load are applied, the energy absorbing spring acts on the trigger switch button and the sliding sleeve and will not be transmitted to the sensor, thereby efficiently, reliably and stably protecting the trigger sensor from damage, and at the same time eliminating the influence of structural deformation caused by heavy load and impact on the reliability of signal triggering, thereby solving the problem that the load directly acts on the sensor under heavy load and impact environment, thereby improving the reliability of signal triggering.

[0007] The present invention absorbs impact energy through an energy-absorbing spring, and uses the movement of the sliding sleeve to adjust the washer limit to prevent the impact load from directly acting on the sensor. The energy-absorbing spring absorbs the load energy, protecting the sensor trigger device from damage due to a large load; after the load is removed, the sliding sleeve can be disengaged from the sensor by using a reset spring outside the sliding sleeve, and the sensor can be reset, thereby improving the overload capacity. The present invention can also appropriately increase the compression stroke of the load by using a trigger switch button, and through adjustment, increase the possibility of the sensor being turned on under vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the transmission type trigger sensor anti-overload protection device of the present invention.

[0009] In the figure: 1 trigger sensor, 2 mounting seat, 3 pressure block, 4 screw sleeve, 5 energy absorption spring, 6 sliding sleeve, 7 trigger switch button, 8 reset spring, 9 adjustment washer.

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the scope of the embodiments described. All these concepts should be regarded as the protection scope of the content disclosed in this technology. DETAILED DESCRIPTION

[0011] See also Figure 1 In the preferred embodiment described below, a transmission type trigger sensor anti-overload protection device includes a mounting seat 2 inserted into an assembly hole to axially position the trigger sensor 1, and a threaded sleeve 4 coaxial with the trigger sensor 1 is provided therein. The screw sleeve 4 is provided with an external thread and a stepped inner hole, and the trigger switch button 7 equipped with an energy absorbing spring 5 extends axially out of the through hole of the sliding sleeve 6 and is constrained between the necked stepped hole of the sliding sleeve 6 and the pressing block 3, thereby forming a pressing assembly; the spring seat ring on the sleeve 6 body positions the reset spring 8 at the rear end of the sliding sleeve 6, and the adjusting washer 9 sleeved on the rear end step shaft of the trigger sensor 1 is pressed against the step hole of the mounting seat 2; the pressing block 3 keeps the energy absorbing spring 5 in the sliding sleeve 6, so that the preload force of the energy absorbing spring 5 is greater than the sum of the working pressure of the reset spring 8, the movement friction of the sliding sleeve 6 and the reset elastic force of the trigger sensor 1. When the pressing assembly is under heavy load and impact, the load acts on the trigger switch button 7, the energy absorbing spring 5 absorbs the load energy, drives the pressing block 3 to slide axially to the left, drives the trigger sensor 1, and connects the sensor signal. At the same time, the reset spring 8 is compressed, the external load disappears, the reset spring 8 drives the pressing assembly to reset, and the pressing block 3 is separated from the trigger sensor 1, thereby realizing the on-off of the measuring head contact end of the trigger sensor 1.

[0012] The embodiments of the present invention have been described in detail above. After understanding the basic creative concept, those skilled in the art can make various changes and modifications to the embodiments without departing from the design spirit and scope of the present invention. The claims of the present invention include these modifications and variations.

Claims

1. A trigger sensor anti-overload protection device for preventing the sensor from being damaged by overload and impact, comprising a mounting seat (2), the mounting seat (2) having an insertion assembly hole for axially positioning the trigger sensor (1), and a screw sleeve (4) coaxial with the trigger sensor (1) being provided in the mounting seat (2), characterized in that: The screw sleeve (4) is provided with an external thread and a stepped inner hole. A sliding sleeve (6) and a trigger switch button (7) equipped with an energy absorption spring (5) are arranged inside the screw sleeve (4). The energy absorption spring (5) is used to absorb impact energy, prevent the impact load from directly acting on the sensor, and protect the sensor trigger device from being damaged by a large load. The trigger switch button (7) axially extends out of the through hole of the sliding sleeve (6). The trigger switch button (7) is constrained between the necked step hole of the sliding sleeve (6) and the pressure block (3), thereby forming an axially slidable pressing component. The pressure block (3) is connected to the energy absorption spring (5). The spring seat ring on the sleeve (6) body positions the reset spring (8) at the rear end of the sliding sleeve (6). An adjusting washer (9) is sleeved on the step shaft at the rear end of the trigger sensor (1). The adjusting washer (9) is pressed against the step hole of the mounting seat (2) through the reset spring (8). One end of the reset spring The pressure block (3) is abutted against the adjusting washer (9), and the other end of the reset spring is cooperatively sleeved on the sliding sleeve (6) and abutted against the spring seat ring on the sliding sleeve body; the pressure block (3) holds the energy absorption spring (5) in the sliding sleeve (6), so that the preload force of the energy absorption spring (5) is greater than the sum of the working pressure of the reset spring (8), the friction force of the sliding sleeve (6) and the reset elastic force of the trigger sensor (1). When the pressing component is under a heavy load or impact environment, the load acts on the trigger switch button (7), the energy absorption spring (5) absorbs the load energy, and drives the pressure block (3) to slide axially to the left. When the pressure block (3) contacts the end face of the step shaft at the rear end of the trigger sensor (1), the trigger sensor (1) is driven to connect the sensor signal, and at the same time the reset spring (8) is compressed, the external load disappears, the reset spring (8) drives the pressing component to reset, and the pressure block (3) is separated from the trigger sensor (1), thereby realizing the on and off of the trigger sensor (1).

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