A high-tolerance in-place detection device suitable for high-speed reciprocating impact
By employing a bidirectional swing reset mechanism and a dual independent spring system, the accuracy and reliability issues of the detection device under high-speed reciprocating impact are resolved, achieving high tolerance adaptability and long service life for position detection, which is suitable for automated warehousing and logistics and intelligent manufacturing production lines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU CAIC ELECTRONICS CO LTD
- Filing Date
- 2026-03-09
- Publication Date
- 2026-05-19
AI Technical Summary
Existing testing devices are insufficient in terms of accuracy and reliability when faced with high-speed reciprocating impacts and high tolerance conditions. They also lack impact resistance, have limited adaptability, and require frequent adjustments.
A bidirectional swing reset mechanism is adopted, combined with a dual independent spring system and a limiting structure, to achieve a directional decoupled trigger swing mechanism, ensuring independent processing of reset accuracy and energy absorption. Large-diameter circular rollers are used to reduce impact wear.
It achieves a balance between high tolerance and ultra-high reset accuracy, improves the reliability and lifespan of the device, adapts to multi-size and multi-pose detection needs, reduces power consumption and maintenance difficulty, and is suitable for automated warehousing and logistics and intelligent manufacturing production lines.
Smart Images
Figure CN121804540B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of industrial automation testing technology, specifically relating to a high-tolerance positioning detection device suitable for high-speed reciprocating impact. Background Technology
[0002] In automated warehousing and logistics, intelligent manufacturing production lines, and various motion mechanisms, real-time and accurate detection of whether workpieces and goods have reached their predetermined positions is a core element in ensuring system process continuity, operational safety, and operational efficiency. Reliable position detection signals are a prerequisite for triggering subsequent mechanical actions or performing logical counting. Proximity sensors (such as inductive, capacitive, and Hall effect sensors) are widely used in this type of position detection due to their advantages of non-contact operation, fast response, and long lifespan.
[0003] Traditional position detection methods typically employ fixed installation: the proximity sensor is directly aligned with the object being detected or fixed to a target along the object's path. When the object arrives in position, the sensor aligns with the target, triggering a signal. However, this method has significant drawbacks:
[0004] 1. Poor tolerance: The position, size, or orientation of the object being detected must be highly consistent. If there are dimensional tolerances, placement deviations, or stopping position errors when the object is transported by different mechanisms, it is very easy to cause the sensor to be falsely triggered (a signal is detected even though the object is not in position) or to be missed (the object is in position but there is no signal).
[0005] 2. Weak impact resistance: In some scenarios where objects need to be positioned by impact or rapidly impacted into place, rigidly fixed sensors or targets directly bear the impact, which can easily lead to loosening, damage or false signals.
[0006] 3. Limited adaptability: A set of sensor settings is usually only for one specific working condition. When the production line changes products or processes are adjusted, it is often necessary to readjust the sensor positions, which is time-consuming and labor-intensive.
[0007] To address the aforementioned shortcomings, existing technologies employ a detection scheme using a swing stop in conjunction with a proximity sensor. This scheme utilizes the impact of the object being detected against the stop, causing it to swing and thus moving a target on the stop away from or into the sensor's sensing area. However, this type of scheme typically only incorporates a simple torsion spring reset on the stop's shaft. Its drawbacks include: reset accuracy is affected by torsion spring fatigue, friction, and post-impact vibration, making it difficult to guarantee that the relative positions of the target and sensor are perfectly aligned after each reset, potentially leading to detection drift over long-term use. Furthermore, the simple swing-torsion spring reset structure lacks effective buffering and energy dissipation mechanisms for impacts from different directions or forces, which may shorten the mechanism's lifespan.
[0008] Therefore, there is an urgent need for a positioning detection device that can adapt to different shapes of the objects being tested and fluctuations in impact force, ensure accurate resetting after each test to guarantee testing consistency, and also has good impact resistance. Summary of the Invention
[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-tolerance positioning detection device suitable for high-speed reciprocating impact.
[0010] To achieve the above objectives, the present invention provides the following technical solution:
[0011] A high-tolerance positioning detection device suitable for high-speed reciprocating impact, characterized in that it includes a base plate, a bidirectional swing reset mechanism mounted on the base plate, and a proximity sensor;
[0012] The bidirectional swing reset mechanism includes a base and a swing arm that can swing bidirectionally in a vertical plane. The base is fixedly mounted on the base plate, and the swing arm is hinged to the base. A trigger for being touched by the object being detected is mounted on the swing arm.
[0013] The bidirectional swing reset mechanism further includes a first actuator, a first reset spring, a second actuator, and a second reset spring. The first actuator is fixedly connected to the swing arm and has a suspended actuating end. The second actuator is located below the first actuator and is hinged to the base in a lever-like manner. The second actuator has a first end and a second end. The actuating end of the first actuator and the first end of the second actuator are in a state of contact or separation depending on the swing position of the swing arm. The two ends of the first reset spring are respectively connected to the first actuator and the first end of the second actuator. The two ends of the second reset spring are respectively connected to the second end of the second actuator and the base.
[0014] The base and the second actuator are also provided with a limiting structure for realizing unidirectional rotation of the second actuator. The limiting structure is configured such that: when the actuating end of the first actuator abuts against and presses against the first end of the second actuator, the second actuator is allowed to rotate; when the actuating end of the first actuator moves away from the first end of the second actuator and pulls the first end of the second actuator by the first return spring, the second actuator is restricted from rotating.
[0015] The proximity sensor is located on one side of the swing arm, and a sensing target is installed on the swing arm. The sensing target is aligned with the proximity sensor when the swing arm is in its initial position.
[0016] As a further preferred embodiment of the above technical solution, the limiting structure includes a first limiting part disposed on the base and a second limiting part disposed on the second actuator. A first limiting surface is disposed on the first limiting part, and a second limiting surface is disposed on the second limiting part. The first limiting surface and the second limiting surface are in selective surface contact based on the rotation direction of the second actuator. When the first limiting surface and the second limiting surface are in surface contact, the second actuator is restricted from rotating. When the first limiting surface and the second limiting surface are not in surface contact, the second actuator is allowed to rotate.
[0017] As a further preferred embodiment of the above technical solution, both the first limiting surface and the second limiting surface are located directly below the hinge point between the second actuator and the base, with the first limiting surface being horizontally positioned; the second limiting surface includes a straight section that can contact the first limiting surface surface and an arcuate section that can contact the first limiting surface point by point.
[0018] As a further preferred embodiment of the above technical solution, the curvature center of the arc segment is the hinge point of the second actuator on the base, and the arc radius of the arc segment is equal to the vertical distance from the hinge point of the second actuator on the base to the first limiting surface.
[0019] As a further preferred embodiment of the above technical solution, the actuating element is a circular roller, which is rotatably connected to the upper end of the swing arm; and the rotation plane of the circular roller is parallel to the swing plane of the swing arm.
[0020] As a further preferred embodiment of the above technical solution, it also includes an initial position positioning mechanism, which includes a mounting groove disposed on the base, a compression spring placed in the mounting groove, and a spherical locking member pushed by the compression spring; a wedge-shaped groove adapted to the spherical locking member is provided at the lower end of the swing arm; when the swing arm is in the initial position, the upper end of the spherical locking member protrudes from the mounting groove and engages with the wedge-shaped groove.
[0021] As a further preferred embodiment of the above technical solution, the proximity sensor includes a sensor housing, a circuit board, and a sensitive element, wherein the circuit board is signal-connected to the sensitive element; the sensor housing is fixedly mounted on the base plate, the circuit board is mounted inside the sensor housing, the sensitive element is mounted above the sensor housing, and the sensitive element corresponds to the sensing target on the swing arm when it is in the initial position.
[0022] Compared with the prior art, the beneficial effects of the present invention are:
[0023] 1. This invention employs an original "directional decoupling, single-spring reset" triggering swing mechanism to achieve a balance between high tolerance and ultra-high reset accuracy. Specifically, this invention uses a cleverly designed unidirectional limiting structure to completely decouple the bidirectional swing triggering and reset logic of the swing arm. This allows the swing arm in different directions to be independently responsible for energy absorption and drive reset by a dedicated reset spring. This design fundamentally solves the contradiction in the prior art where a single elastic element must provide both tolerance buffering and reset accuracy, making it difficult to achieve both simultaneously.
[0024] 2. The dual independent spring system adopted in this invention ensures operational reliability and ultra-long service life under extreme working conditions. Specifically, the two independent return springs respectively cope with impacts from different directions, avoiding the complex fatigue problem of a single spring under bidirectional alternating force. Moreover, each spring only works in a single swing direction of the swing arm, with clear force conditions and more accurate life prediction. Especially in high-speed, high-impact reciprocating motion, this design can significantly reduce the failure risk of the return spring, ensuring the long-term reliability of the mechanism's operation and the stability of the signal output.
[0025] 3. This invention achieves complex functions through simple mechanical linkage and geometric limit, without the need for electronic control or software algorithms. The logic is clear and reliable, and the proximity sensor only generates extremely low power consumption when switching states. It is very suitable for mobile or distributed application scenarios with limited power supply. In addition, the overall device has a high degree of modularity and is easy to install, debug and maintain.
[0026] 4. This invention integrates the reliability of non-contact sensing and detection, the durability of mechanical mechanisms, and the intelligence of adaptive tolerance, providing a cost-effective and highly reliable arrival detection solution for demanding scenarios such as automated warehousing and logistics, intelligent manufacturing production lines, and impact feeding mechanisms, effectively improving the overall system operating efficiency.
[0027] 5. The present invention uses a large-diameter circular roller as the actuating element, which can reduce the impact and wear between the actuating element and the object being tested by utilizing the rotation of the actuating element. At the same time, it can also adapt to the positioning detection requirements of objects of various sizes and postures, further improving the tolerance and applicability of the present invention. Attached Figure Description
[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:
[0029] Figure 1 This is a schematic diagram of the structure of the present invention in its initial working state;
[0030] Figure 2 for Figure 1 A schematic cross-sectional view of section AA in the middle;
[0031] Figure 3 for Figure 1 Side view;
[0032] Figure 4 for Figure 3 Schematic diagram of the cross-section of section BB;
[0033] Figure 5 for Figure 3 A schematic cross-sectional view of section CC;
[0034] Figure 6 This is a schematic diagram of the working state of the swing arm when it swings clockwise in this invention;
[0035] Figure 7 This is a schematic diagram of the working state of the swing arm when it swings counterclockwise in this invention.
[0036] Among them, 1-base plate, 2-proximity sensor, 201-sensor housing, 202-circuit board, 203-sensitive element, 3-base, 301-first limiting part, 4-swing arm, 5-touch element, 6-first actuating element, 7-first reset spring, 8-second actuating element, 801-second limiting part, 9-second reset spring, 10-sensing target, 11-compression spring, 12-spherical locking element. Detailed Implementation
[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0038] Example 1
[0039] like Figures 1 to 7 As shown, this embodiment provides a high-tolerance positioning detection device suitable for high-speed reciprocating impact, including a base plate 1, a bidirectional swing reset mechanism mounted on the base plate 1, and a proximity sensor 2; the base plate 1 is the mounting base of the entire device, usually made of metal sheet, and is fixedly installed on the equipment frame or cargo conveying line.
[0040] The bidirectional swing reset mechanism includes a base 3 and a swing arm 4 capable of bidirectional swinging in a vertical plane. The base 3 is fixedly mounted on the base plate 1, and the swing arm 4 is hinged to the base 3. An actuating element 5 for being touched by a detected object is mounted on the upper end of the swing arm 4. Specifically, the base 3 is an irregularly shaped support frame, which is fixedly mounted on the base plate 1 by bolts. The swing arm 4 is hinged to the base 3 via a swing arm pivot, with both ends of the pivot fixedly mounted on the base 3. The lower end of the swing arm 4 is sleeved on the pivot via a rolling bearing. In this embodiment, the trigger 5 is a large-diameter circular roller. A trigger shaft is fixedly connected to the upper end of the swing arm 4 perpendicular to the swing plane of the swing arm 4. The circular roller is sleeved on the trigger shaft through a rolling bearing. When the object being detected impacts the circular roller at different angles, the circular roller can rotate around the trigger shaft to reduce the impact wear between the two. The rotation plane of the circular roller is parallel to the swing plane of the swing arm 4 to ensure that when the object being detected impacts the circular roller, it can also drive the swing arm 4 to swing.
[0041] The bidirectional swing reset mechanism further includes a first actuator 6, a first reset spring 7, a second actuator 8, and a second reset spring 9. The first actuator 6 is fixedly connected to the swing arm 4. The first actuator 6 has a suspended actuating end. Specifically, the first actuator 6 is L-shaped, with one end fixedly connected to the actuating element's rotating shaft and the other end being a downward-facing and suspended actuating end. The second actuator 8 is located below the first actuator 6 and is hinged to the base 3 in a lever-like manner. Specifically, the second actuator 8 is elongated and is hinged to the base 3 via a lever shaft. In this embodiment, the lever shaft and the swing arm's rotating shaft are the same shaft. Taking the hinge point of the second actuator 8 as the fulcrum, its two ends are the first end and the second end, respectively. The actuating end of the first actuator 6 and the second actuator 8... The first end of the first actuator 6 is in a state of contact or separation based on the swing position of the swing arm 4. Specifically, when the swing arm 4 is in the initial position, the actuating end of the first actuator 6 is in contact with the first end of the second actuator 8. When the swing arm 4 swings in different directions, the actuating end of the first actuator 6 will continue to contact and press or move away from the first end of the second actuator 8. The two ends of the first return spring 7 are respectively connected to the first ends of the first actuator 6 and the second actuator 8. The two ends of the second return spring 9 are respectively connected to the second end of the second actuator 8 and the base 3. The first return spring 7 and the second return spring 9 are respectively used to realize the return of the swing arm 4 after swinging in different directions to both sides, and when one of the return springs deforms, the other return spring does not deform.
[0042] It should be noted that in this embodiment, the initial position of the swing arm 4 is vertical.
[0043] To accommodate the aforementioned double return spring structure, this embodiment also requires the provision of a limiting structure on the base 3 and the second actuator 8 to enable unidirectional rotation of the second actuator 8. The limiting structure is configured such that: when the actuating end of the first actuator 6 abuts against and presses against the first end of the second actuator 8, the second actuator 8 is allowed to rotate; when the actuating end of the first actuator 6 moves away from the first end of the second actuator 8 and pulls the first end of the second actuator 8 through the first return spring 7, the second actuator 8 is restricted from rotating.
[0044] The proximity sensor 2 is located on one side of the swing arm 4, and a sensing target 10 is mounted on the swing arm 4. The sensing target 10 is made of a metal material that can generate a signal with the proximity sensor 2. The sensing target 10 is aligned with the proximity sensor 2 when the swing arm 4 is in its initial position. Specifically, the proximity sensor 2 is a high-performance inductive proximity sensor, which includes a sensor housing 201, a circuit board 202, and a sensing element 203. The sensing element 203 is an induction coil, and the circuit board 202 is signal-connected to the sensing element 203. The sensor housing 201 is fixedly mounted on the base plate 1 by bolts, the circuit board 202 is installed inside the sensor housing 201, and the sensing element 203 is mounted on the sensor. The sensing element 203 is positioned above the outer casing 201 and corresponds to the sensing target 10 on the swing arm 4 when it is in its initial vertical position. Its working principle is as follows: In the initial state, the sensing surface of the sensing element 203 is directly opposite the sensing target 10 on the swing arm 4. At this time, the inductance value of the sensing element 203 remains stable, and it outputs an electrical signal indicating that the target is in place. When the detected object strikes the circular roller and causes the swing arm 4 to swing, an angular deviation occurs between the sensing target 10 on the swing arm 4 and the sensing element 203, causing a change in the inductance value of the sensing element 203. After the circuit of the circuit board 202 calculates the change, it outputs an electrical signal indicating that the target is not in place. After the swing arm 4 resets, the sensing target 10 and the sensing element 203 on it re-align axially, and it outputs an electrical signal indicating that the target is in place.
[0045] It should be further explained that the bidirectional swing reset mechanism is configured as follows:
[0046] like Figure 6As shown, when the swing arm 4 is touched by the external force of the object being detected and swings from the initial vertical position to the first side, it will drive the actuating end of the first actuator 6 to push the first end of the second actuator 8. The limiting structure allows the second actuator 8 to rotate. At this time, the first return spring 7 maintains its original length and the second return spring 9 is stretched. After the touch is released, the swing arm 4 is driven to return to the initial vertical position by means of the retraction of the second return spring 9.
[0047] like Figure 7 As shown, when the swing arm 4 is touched by the external force of the object being detected and swings from the initial vertical position to the second side direction opposite to the first side direction, the actuating end of the first actuator 6 moves away from the first end of the second actuator 8 and stretches the first return spring 7. The limiting structure prevents the second actuator 8 from rotating. At this time, the second return spring 9 maintains its original length, and the first return spring 7 is stretched. After the touch is released, the swing arm 4 is driven to return to the initial vertical position by means of the retraction action of the first return spring 7.
[0048] like Figure 1 As shown, in the initial state of the high-tolerance positioning detection device in this embodiment, the swing arm 4 is in a completely vertical state, the second actuator 8 is in a completely horizontal state, the actuating end of the first actuator 6 just abuts against the first end of the second actuator 8, and the first return spring 7 and the second return spring 9 are in an unforced state.
[0049] It should be noted that the concepts of first end, second end, first side direction, and second side direction are introduced above to more clearly explain the working mechanism of the bidirectional swing reset mechanism, and are not a closed limitation. That is, the first end of the second actuator 8 can be its left end or its right end based on the direction positioning in the figure, while the second end of the second actuator 8 is the end opposite to the first end of the second actuator 8; the swing arm 4 swings in the first side direction in either clockwise or counterclockwise, while the swing arm 4 swings in the second side direction in the opposite direction to the first side direction.
[0050] The above concept is introduced to indicate that when the swing arm 4 in this device swings in a certain direction (clockwise or counterclockwise), the actuating end of the first actuator 6, which swings synchronously with it, will apply pressure to a certain end (left end or right end) of the second actuator 8, such as... Figure 6As shown, when the swing arm 4 swings clockwise, the actuating end of the first actuator 6 presses against the right end of the second actuator 8. The limiting structure allows the second actuator 8 to rotate. At this time, the first return spring 7 does not work, and the second return spring 9 performs the reset function. Conversely, when the swing arm 4 in this device swings in another direction, the actuating end of the first actuator 6, which swings synchronously with it, will move away from the same end of the second actuator 8. Figure 7 As shown, the swing arm 4 swings counterclockwise, the actuating end of the first actuator 6 moves away from the right end of the second actuator 8, and the first return spring 7 is stretched. However, under the restriction of the limiting structure, the second actuator 8 cannot rotate. At this time, the second return spring 9 does not work, and the first return spring 7 plays a reset role.
[0051] In further embodiments, the device can be configured by adjusting the relative position of the swing arm 4 and the second actuator 8 as follows: the swing arm 4 swings clockwise, and the actuating end of the first actuator 6 presses against the left end of the second actuator 8; or the swing arm 4 swings counterclockwise, and the actuating end of the first actuator 6 presses against the right end of the second actuator 8; or the swing arm 4 swings counterclockwise, and the actuating end of the first actuator 6 presses against the left end of the second actuator 8. Accordingly, the limiting structure also needs to be configured according to actual requirements.
[0052] Example 2
[0053] This embodiment is a further supplement to Embodiment 1 above, such as... Figure 4 As shown, in this embodiment, the limiting structure includes a first limiting part 301 disposed on the base 3 and a second limiting part 801 disposed on the second actuator 8. A first limiting surface is disposed on the first limiting part 301, specifically the upper surface of the first limiting part 301, and a second limiting surface is disposed on the second limiting part 801, specifically the lower surface of the second limiting part 801. The first limiting surface and the second limiting surface are in selective surface contact based on the rotation direction of the second actuator 8. When the first limiting surface and the second limiting surface are in surface contact, the second actuator 8 is restricted from rotating. When the first limiting surface and the second limiting surface are not in surface contact, the second actuator 8 is allowed to rotate.
[0054] Specifically, both the first limiting surface and the second limiting surface are located directly below the hinge point between the second actuator 8 and the base 3. The first limiting surface is horizontally positioned. The second limiting surface includes a straight section that can contact the surface of the first limiting surface and an arc section that can contact the point of the first limiting surface. The center of curvature of the arc section is the hinge point of the second actuator 8 on the base 3, and the radius of curvature of the arc section is equal to the vertical distance from the hinge point of the second actuator 8 on the base 3 to the first limiting surface.
[0055] When the second actuator 8 is in the initial position, the first limiting surface is in contact with the straight section of the second limiting surface, and the second actuator 8 has no tendency to rotate. When the actuating end of the first actuator 6 abuts against and presses against the first end of the second actuator 8, the arc section of the second limiting surface is in point contact with the limiting plane on the base 3, so as to allow the second actuator 8 to rotate. When the actuating end of the first actuator 6 moves away from the first end of the second actuator 8 and pulls the second actuator 8 through the first return spring 7, the first limiting surface and the straight section of the second limiting surface always maintain surface contact, so as to restrict the rotation of the second actuator 8.
[0056] In this embodiment, as Figure 4 As shown, the limiting structure is used to restrict the second actuator 8 from rotating counterclockwise. Therefore, the left half of the second limiting surface needs to be set as a straight section, and the right half of the second limiting surface needs to be set as an arc section.
[0057] In more embodiments, the limiting structure can also be a stop structure, that is, corresponding stops are respectively provided on the base 3 and the second actuator 8, thereby limiting the rotation of the second actuator 8 in a certain direction.
[0058] Example 3
[0059] This embodiment is a further supplement to Embodiment 1 above, such as... Figure 2 As shown, it also includes an initial position positioning mechanism, which includes a mounting groove on the base 3, a compression spring 11 placed in the mounting groove, and a spherical locking member 12 pushed by the compression spring 11. The spherical locking member 12 is a metal ball. A wedge-shaped groove adapted to the spherical locking member 12 is provided at the lower end of the swing arm 4. When the swing arm 4 is in the initial vertical position, the upper end of the spherical locking member 12 protrudes from the mounting groove and engages with the wedge-shaped groove, providing additional positioning force for the swing arm 4, so as to further enhance the stability of the swing arm 4 under weak external interference and avoid false alarms.
[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A high-tolerance positioning detection device suitable for high-speed reciprocating impact, characterized in that, Includes a base plate (1), a bidirectional swing reset mechanism mounted on the base plate (1), and a proximity sensor (2); The bidirectional swing reset mechanism includes a base (3) and a swing arm (4) that can swing bidirectionally in a vertical plane. The base (3) is fixedly installed on the base plate (1). The swing arm (4) is hinged to the base (3). A trigger (5) for being touched by the object being detected is installed on the swing arm (4). The bidirectional swing reset mechanism further includes a first actuator (6), a first reset spring (7), a second actuator (8), and a second reset spring (9). The first actuator (6) is fixedly connected to the swing arm (4) and has a suspended actuating end. The second actuator (8) is located below the first actuator (6) and is hinged to the base (3) in a lever-like manner. The second actuator (8) has a first end and a second end. The actuating end of the first actuator (6) and the first end of the second actuator (8) are in a state of contact or separation based on the swing position of the swing arm (4). The two ends of the first reset spring (7) are respectively connected to the first end of the first actuator (6) and the first end of the second actuator (8). The two ends of the second reset spring (9) are respectively connected to the second end of the second actuator (8) and the base (3). A limiting structure for enabling unidirectional rotation of the second actuator (8) is also provided on the base (3) and the second actuator (8). The limiting structure is configured such that: when the actuating end of the first actuator (6) abuts against and presses against the first end of the second actuator (8), the second actuator (8) is allowed to rotate; when the actuating end of the first actuator (6) moves away from the first end of the second actuator (8) and pulls the first end of the second actuator (8) through the first return spring (7), the second actuator (8) is restricted from rotating. The proximity sensor (2) is located on one side of the swing arm (4), and a sensing target (10) is installed on the swing arm (4). The sensing target (10) is aligned with the proximity sensor (2) when the swing arm (4) is in the initial position.
2. The high-tolerance positioning detection device according to claim 1, characterized in that, The limiting structure includes a first limiting part (301) disposed on the base (3) and a second limiting part (801) disposed on the second actuator (8). A first limiting surface is disposed on the first limiting part (301) and a second limiting surface is disposed on the second limiting part (801). The first limiting surface and the second limiting surface are in selective surface contact based on the rotation direction of the second actuator (8). When the first limiting surface and the second limiting surface are in surface contact, the second actuator (8) is restricted from rotating. When the first limiting surface and the second limiting surface are not in surface contact, the second actuator (8) is allowed to rotate.
3. The high-tolerance positioning detection device according to claim 2, characterized in that, Both the first limiting surface and the second limiting surface are located directly below the hinge point between the second actuator (8) and the base (3). The first limiting surface is horizontally positioned. The second limiting surface includes a straight section that can contact the first limiting surface and an arc section that can contact the first limiting surface point by point.
4. The high-tolerance positioning detection device according to claim 3, characterized in that, The curvature center of the arc segment is the hinge point of the second actuator (8) on the base (3), and the arc radius of the arc segment is equal to the vertical distance from the hinge point of the second actuator (8) on the base (3) to the first limiting surface.
5. The high-tolerance positioning detection device according to any one of claims 1 to 4, characterized in that, The trigger (5) is a circular roller, which is rotatably connected to the upper end of the swing arm (4); and the rotation plane of the circular roller is parallel to the swing plane of the swing arm (4).
6. The high-tolerance positioning detection device according to any one of claims 1 to 3, characterized in that, It also includes an initial position positioning mechanism, which includes a mounting groove on the base (3), a compression spring (11) placed in the mounting groove, and a spherical locking member (12) pushed by the compression spring (11); a wedge-shaped groove adapted to the spherical locking member (12) is provided at the lower end of the swing arm (4); when the swing arm (4) is in the initial position, the upper end of the spherical locking member (12) protrudes out of the mounting groove and engages with the wedge-shaped groove.
7. The high-tolerance positioning detection device according to any one of claims 1 to 3, characterized in that, The proximity sensor (2) includes a sensor housing (201), a circuit board (202), and a sensing element (203). The circuit board (202) is connected to the sensing element (203) via a signal. The sensor housing (201) is fixedly mounted on the base plate (1). The circuit board (202) is mounted inside the sensor housing (201). The sensing element (203) is mounted above the sensor housing (201) and corresponds to the sensing target (10) on the swing arm (4) when it is in the initial position.