An emergency return limit switch device

Abstract

The utility model discloses a kind of quick-return limit switch devices, including quick-return limit device and one side adjacent fixed reset baffle;Quick-return limit device includes shell and cover plate, one end of shell has arc slot, and there is quick-return shaft in shell, one end of quick-return shaft passes out arc slot and has top wheel, and the other end of quick-return shaft is inserted into rotating sleeve, spring is in rotating sleeve, and rotating sleeve is rotated by shaft and shell inner wall, cover plate outside;There are self-resetting switches from above and below of quick-return shaft respectively, and quick-return shaft is fixed with contact two self-resetting switch contact points is pressing plate.Occupation: quick-return shaft eccentric rotation, after touching measured object, can quickly rotate and leave measured object, and touch switch on-off simultaneously, interlock equipment limit movement, realize mechanical structure response, avoid dust environment to be not good and appear limit false signal, or no signal, avoid equipment moving part to impact measured object, cause measured object damage to lead to whole product unqualified.

Description

Technical Field

[0001] This utility model relates to the field of limit switch technology, specifically to a quick-return limit switch device. Background Technology

[0002] In general, factory production lines require numerous sensors to detect workpieces, finished products, or semi-finished products, and to trigger equipment movement limits. Existing limit sensors often employ non-contact electromagnetic induction sensors or mechanical contact sensors. However, in the production of conductive graphite products, the momentary proximity between moving parts and the workpiece makes prolonged mechanical contact sensors unsuitable. Non-contact electromagnetic induction limit sensors are typically used, providing instantaneous sensing and signal transmission. However, the production environment often involves significant graphite dust, leading to poor conditions. When using non-contact limit sensors, graphite powder adheres to the sensor contacts, easily causing false or no signals. This can result in moving parts colliding with the workpiece, damaging it, and ultimately rendering the entire product unqualified. Utility Model Content

[0003] The purpose of this utility model is to provide a quick-return limit switch device.

[0004] This utility model is implemented by the following technical solution:

[0005] A quick-return limit switch device includes a quick-return limit device and a fixed reset baffle adjacent to one side;

[0006] The quick-return limiting device includes a housing and a cover plate. One end of the housing is provided with an arc-shaped groove extending to the bottom. The inside of the housing is provided with a quick-return shaft. One end of the quick-return shaft passes through the arc-shaped groove and is rotatably connected to a top wheel. The other end of the quick-return shaft is slidably inserted into one end of a rotating sleeve. The rotating sleeve is provided with a spring sleeved on the quick-return shaft. One end of the spring is fixed to the end of the quick-return shaft inside the rotating sleeve, and the other end of the spring is fixed to the rotating sleeve. Coaxial shafts are fixed on both sides of the outside of the rotating sleeve. The shafts on both sides are rotatably connected to the inner wall of the housing and the cover plate, respectively.

[0007] An eccentric sector platform is fixed to the inner wall of the housing. A first elongated hole is provided along the axial direction on the quick-return shaft. A wheel axle slides in the first elongated hole. Rollers are rotatably connected to both ends of the wheel axle. The wheel surface of the rollers makes rolling contact with the arc-shaped platform surface of the eccentric sector platform.

[0008] Self-reset switches, fixed to the inner wall of the housing, are respectively provided at the horizontal position above and the vertical position below the quick-return shaft. The contacts of the two self-reset switches are perpendicular to each other. A second elongated hole is provided along the axial direction on the quick-return shaft. An elongated shaft slides in the second elongated hole. The two ends of the elongated shaft are respectively fixed to the vertical plate. A pressure plate is fixed between the top and bottom of the two vertical plates. The two pressure plates respectively movably contact the contacts of the two self-reset switches.

[0009] The cover plate is provided with an arc-shaped through groove for any of the rollers to pass through. The end of the fixed reset baffle adjacent to the quick return limiting device is an upward-sloping end face. The sloping end face of the fixed reset baffle contacts the roller that passes through the arc-shaped through groove.

[0010] Preferably, the cover plate is fixed to the quick-return limiting device by multiple screws threaded into the screw holes of the housing.

[0011] Preferably, the eccentric sector platform is provided with an arc-shaped groove for the pressure plate to move in an arc shape.

[0012] Preferably, the housing further includes wiring terminals and a cable tie, the cable tie being disposed at the bottom of the housing.

[0013] Preferably, it further includes a sensitivity adjustment bolt, which is screwed onto the housing above the quick-return shaft, and the end of the sensitivity adjustment bolt abuts against the quick-return shaft.

[0014] Advantages of this utility model: The design of this application is that the quick-return shaft rotates eccentrically and is simultaneously pulled by stored force. After touching the object being tested, it can release the force and quickly rotate away from the object being tested. At the same time, the touch switch is turned on and off, and the interlocking equipment moves to the limit, realizing mechanical structure sensing. This avoids false limit signals or no signals due to poor dust environment, and avoids the moving parts of the equipment hitting the object being tested, which would damage the object and cause the entire product to be unqualified. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure with the cover plate removed.

[0018] Figure 3 This is a front view of the overall structure of this utility model.

[0019] Figure 4 yes Figure 3 A diagram illustrating the usage status.

[0020] In the diagram: 1. Quick return limit device; 2. Fixed reset baffle; 3. Housing; 4. Cover plate; 5. Arc groove; 6. Quick return shaft; 7. Top wheel; 8. Rotating sleeve; 9. Spring; 10. Shaft; 11. Eccentric sector platform; 12. First long hole; 13. Wheel axle; 14. Roller; 15. Self-reset switch; 16. Second long hole; 17. Long shaft; 18. Vertical plate; 19. Pressure plate; 20. Arc groove; 21. Arc through groove; 22. Sloping end face; 23. Wiring terminal; 24. Cable tie; 25. Sensitivity adjustment bolt. Detailed Implementation

[0021] 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.

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a quick-return limit switch device includes a quick-return limit device 1 and a fixed reset baffle 2 adjacent to one side.

[0023] The quick return limit device 1 includes a housing 3 and a cover plate 4. The cover plate 4 is fixed to the quick return limit device 1 by multiple screws connected to the screw holes of the housing 3. By disassembling the cover plate 4, the internal structural components, parts and other structures can be replaced, repaired and installed.

[0024] One end of the housing 3 is provided with an arc-shaped groove 5 extending to the bottom. Inside the housing 3 is a quick-return shaft 6. One end of the quick-return shaft 6 passes through the arc-shaped groove 5 and is rotatably connected to a top wheel 7. The top wheel 7 is rotatably connected to the middle of the U-shaped wheel frame. Then, by fixing the wheel frame to the end of the quick-return shaft 6, the rotatable connection with the end of the quick-return shaft 6 is achieved. The rolling direction of the top wheel 7 is consistent with the slotting direction of the arc-shaped groove 5.

[0025] The other end of the quick-return shaft 6 is slidably inserted into one end of the rotating sleeve 8. The rotating sleeve 8 is provided with a spring 9 sleeved on the quick-return shaft 6. One end of the spring 9 is fixed to the end of the quick-return shaft 6 inside the rotating sleeve 8, and the other end of the spring 9 is fixed to the rotating sleeve 8. The outer sides of the rotating sleeve 8 are respectively fixed with coaxially arranged shaft rods 10. The shaft rods 10 on both sides are respectively rotatably connected to the inner wall of the housing 3 and the cover plate 4. The end of the quick-return shaft 6 inside the rotating sleeve 8 can be fixed with a disc. The diameter of this disc is larger than the diameter of the quick-return shaft 6 so as to better press the spring 9. The hole through which the quick-return shaft 6 passes in the rotating sleeve 8 can have an inwardly protruding boss so as to better resist the spring 9.

[0026] The rotating sleeve 8 rotates via the shaft 10, causing the quick-return shaft 6 to move around the shaft 10 as the center. Figure 3 , 4 The rotational motion indicated by the dashed arrow allows the end of the quick-return shaft 6 to move within the rotating sleeve 8 and compress the spring 9 to store force, enabling the quick-top wheel 7 to achieve eccentric rotation.

[0027] An eccentric sector platform 11 is fixed on the inner wall of the housing 3. A first elongated hole 12 is provided on the quick-return shaft 6 along the axial direction. A wheel shaft 13 slides in the first elongated hole 12. Rollers 14 are rotatably connected to both ends of the wheel shaft 13. The wheel surface of the roller 14 rolls in contact with the arc-shaped platform surface of the eccentric sector platform 11.

[0028] like Figure 4 As shown, when the quick-return shaft 6 rotates vertically downwards, driving the top wheel 7 to rotate to the lower position, the quick-return shaft 6 rotates around the shaft 10 with a radius of r. At this time, the surface of the roller 14 contacts the bottom of the arc-shaped platform of the eccentric sector platform 11, and the axle 13 is located at the end of the first elongated hole 12 away from the rotating sleeve 8. However, as Figure 3 As shown, when the quick-return shaft 6 is close to horizontal and drives the top wheel 7 to rotate upward, the quick-return shaft 6 also rotates around the shaft 10 as the center. However, it is limited by the eccentric sector platform 11. At this time, the wheel surface of the roller 14 contacts the right side of the arc-shaped platform surface of the eccentric sector platform 11. The radius is set to R, R>r. The wheel axle 13 is located at the end of the first long hole 12 near the rotating sleeve 8. The quick-return shaft 6 is pulled away, and the top wheel 7 achieves eccentric rotation.

[0029] Self-reset switches 15 are fixed to the inner wall of housing 3 at the horizontal position above and the vertical position below the quick-return shaft 6. The self-reset switches 15 are normally open / normally closed self-reset switches, which can be interlocked with the equipment to achieve control. The normally open / normally closed self-reset switches can also be any commercially available emergency stop button self-reset switches. Only the emergency stop button series connection part needs to be removed to achieve use. The contacts of the two self-reset switches 15 are perpendicular to each other. The quick-return shaft 6 is provided with a second elongated hole 16 along the axial direction. A long shaft 17 slides in the second elongated hole 16. The two ends of the long shaft 17 are fixed to the vertical plate 18 respectively. Pressure plates 19 are fixed between the top and bottom of the two vertical plates 18 respectively. The two pressure plates 19 respectively movably contact the contacts of the two self-reset switches 15. The eccentric sector table 11 is provided with an arc-shaped slide groove 20 for the pressure plate 19 to move in an arc.

[0030] When the quick-return shaft 6 rotates vertically downwards or nearly horizontally to the right, it causes the two pressure plates 19 to respectively contact the contacts of the two self-resetting switches 15, triggering the on / off action. The two pressure plates 19 move in an arc within the arc-shaped groove 20, thus following the same trajectory as the roller 14. The quick-return shaft 6 is vertically downwards, and the long shaft 17 is located at the end of the second long hole 16 away from the rotating sleeve 8. However, as... Figure 3 As shown, the quick-return shaft 6 is nearly horizontal, and the long shaft 17 is located at one end of the second long hole 16 near the rotating sleeve 8.

[0031] The cover plate 4 is provided with an arc-shaped through groove 21 through which any roller 14 passes. The bottom end of the arc-shaped through groove 21 has a round hole with a diameter larger than that of the roller 14. When the cover plate 4 is opened and closed, the roller 14 can pass through the arc-shaped through groove 21. The end of the fixed reset baffle 2 adjacent to the quick return limiting device 1 is an inclined end face 22 facing upward. The inclined end face 22 of the fixed reset baffle 2 contacts the roller 14 that passes through the arc-shaped through groove 21.

[0032] In this embodiment, during use, the quick-return shaft 6 is in a near-horizontal right-leaning state, slightly tilted downwards. The spring 9 tightens and pulls the quick-return shaft 6. The right side of the arc-shaped platform of the eccentric sector 11 has a groove for the limiting roller 14, causing the quick-return shaft 6 to remain in the above-mentioned state, which is the initial position. The moving parts of the device move, causing the quick-return limit switch device of this application to move to the right. The top wheel 7 contacts the object being measured and is subjected to the reverse pressure of the object being measured. The axle 13 is moved, causing the quick-return shaft 6 to rotate downwards in the tilt direction. The roller 14 rolls along the arc of the eccentric sector 11. At the same time, the spring 9 gradually releases its elastic force, causing the quick-return shaft 6 to rotate rapidly to a vertical downward position, leaving the upper self-reset switch 15 contact and then contacting the lower self-reset switch 15. The contact point enables the switch to operate. The bottom of the arc-shaped platform of the eccentric sector table 11 has a groove for the roller 14. Then, the moving parts of the equipment retract and move away from the object being measured. The retraction is slow, so that the inclined end face 22 of the fixed reset baffle 2 contacts the roller 14 that passes through the arc-shaped through groove 21. This drives the roller 14 to rise obliquely upward with the inclined end face 22, making an arc-shaped trajectory. The internal roller 14 goes out of the groove at the bottom of the eccentric sector table 11. The quick return shaft 6 rotates upward to a near-horizontal state. During this process, the spring 9 is compressed and stores force, which causes the quick return shaft 6 to be pulled back to its initial position. The quick return shaft 6 leaves the contact of the self-reset switch 15 below and touches the contact of the self-reset switch 15 above, realizing the reset action of the switch.

[0033] The housing 3 also includes a terminal block 23 and a cable tie 24. The cable tie 24 passes through the bottom of the housing 3. The terminal block 23 and the cable tie 24 are used to install wires so that the two self-resetting switches 15 can be connected to the control terminal of the external device respectively.

[0034] It also includes a sensitivity adjustment bolt 25, which is screwed onto the housing 3 above the quick-return shaft 6. The end of the sensitivity adjustment bolt 25 abuts against the quick-return shaft 6. The end of the sensitivity adjustment bolt 25 can limit the horizontal state of the quick-return shaft 6, so that the quick-return shaft 6 tilts slightly downward. The raising and lowering of the sensitivity adjustment bolt 25 can adjust the tilt of the quick-return shaft 6. For example, the lowering adjustment makes the quick-return shaft 6 tilt more downward. At this time, the top wheel 7 is touched and is more easily triggered to make the quick-return shaft 6 rotate downward. Therefore, it is a sensitivity adjustment.

[0035] Working principle: When this utility model is in use, the quick-return shaft 6 is initially in a slightly downward tilted position. The spring 9 tightens and pulls the quick-return shaft 6, causing the moving parts of the equipment to move the quick-return limit switch device to the right. The top wheel 7 contacts the object being measured and receives reverse pressure. The internal roller 14 disengages from the upper slot, and the quick-return shaft 6 rotates downward, moving away from the object being measured. At the same time, the upper pressure plate 19 disengages from the contact of the upper self-reset switch 15. Afterward, the roller 14 rolls in an arc along the eccentric fan-shaped platform 11, and the spring 9 gradually releases its elasticity. The quick-return shaft 6 rotates rapidly to the lower position. When the lower pressure plate 19 touches the contact of the lower self-reset switch 15, the switch interlocking device performs a limit action. Afterward, the moving parts of the device slowly retract, and the inclined end face 22 of the fixed reset baffle 2 causes the outer roller 14 to rise, and the inner roller 14 to disengage from the bottom slot, driving the quick return shaft 6 to rotate upward. The spring 9 is compressed and stores force, and the quick return shaft 6 is pulled back to its initial position. The quick return shaft 6 leaves the contact of the lower self-reset switch 15 and touches the contact of the upper self-reset switch 15, thus realizing the reset action of the switch interlocking device.

[0036] Advantages: This application features a quick-return shaft 6 that rotates eccentrically and is simultaneously pulled by stored force. After contacting the object being tested, it releases the force and quickly rotates away from the object. At the same time, it triggers the on / off switch, interlocking the equipment to move to the limit, thus realizing mechanical structure sensing. This avoids false limit signals or no signals due to poor dust environments, and prevents moving parts of the equipment from colliding with the object being tested, which could damage the object and cause the entire product to fail.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quick-return limit switch device, characterized in that, Includes a quick-return limit device and an adjacent fixed reset baffle on one side; The quick-return limiting device includes a housing and a cover plate. One end of the housing is provided with an arc-shaped groove extending to the bottom. The inside of the housing is provided with a quick-return shaft. One end of the quick-return shaft passes through the arc-shaped groove and is rotatably connected to a top wheel. The other end of the quick-return shaft is slidably inserted into one end of a rotating sleeve. The rotating sleeve is provided with a spring sleeved on the quick-return shaft. One end of the spring is fixed to the end of the quick-return shaft inside the rotating sleeve, and the other end of the spring is fixed to the rotating sleeve. Coaxial shafts are fixed on both sides of the outside of the rotating sleeve. The shafts on both sides are rotatably connected to the inner wall of the housing and the cover plate, respectively. An eccentric sector platform is fixed to the inner wall of the housing. A first elongated hole is provided along the axial direction on the quick-return shaft. A wheel axle slides in the first elongated hole. Rollers are rotatably connected to both ends of the wheel axle. The wheel surface of the rollers makes rolling contact with the arc-shaped platform surface of the eccentric sector platform. Self-reset switches, fixed to the inner wall of the housing, are respectively provided at the horizontal position above and the vertical position below the quick-return shaft. The contacts of the two self-reset switches are perpendicular to each other. A second elongated hole is provided along the axial direction on the quick-return shaft. An elongated shaft slides in the second elongated hole. The two ends of the elongated shaft are respectively fixed to the vertical plate. A pressure plate is fixed between the top and bottom of the two vertical plates. The two pressure plates respectively movably contact the contacts of the two self-reset switches. The cover plate is provided with an arc-shaped through groove for any of the rollers to pass through. The end of the fixed reset baffle adjacent to the quick return limiting device is an upward-sloping end face. The sloping end face of the fixed reset baffle contacts the roller that passes through the arc-shaped through groove.

2. The quick-return limit switch device according to claim 1, characterized in that: The cover plate is fixed to the quick-return limiting device by multiple screws threaded into the screw holes of the housing.

3. The quick-return limit switch device according to claim 1, characterized in that: The eccentric sector platform is provided with an arc-shaped groove for the pressure plate to move in an arc.

4. The quick-return limit switch device according to claim 1, characterized in that: The housing also includes wiring terminals and a cable tie, with the cable tie extending through the bottom of the housing.

5. The quick-return limit switch device according to claim 1, characterized in that: It also includes a sensitivity adjustment bolt, which is screwed onto the housing above the quick-return shaft, with the end of the sensitivity adjustment bolt abutting against the quick-return shaft.

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