Contact alarm output device for mechanical accelerometer
By using a point contact design between a metal spring plate and a conical sleeve, and mechanical actuation, the problem of accidental contact in traditional mechanical accelerometers under vibration conditions is solved, achieving high reliability and fast, accurate alarm output, suitable for high temperature, high vibration, and strong electromagnetic environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional mechanical accelerometers are prone to accidental contact or poor contact in vibration environments, resulting in unstable signal output.
The design employs a point contact between a metal spring sheet and the second contact point, combined with the mechanical push of a conical sleeve, to ensure tight contact and reliable conduction when the alarm is triggered. The on/off status can be detected by connecting an external alarm output resistor or by direct detection. Combined with a transparent dome shell and a colored indicator ring, it is easy to observe changes in status.
It improves the signal output reliability of mechanical accelerometers, is suitable for high temperature, high vibration, and strong electromagnetic environments, reduces maintenance complexity, adapts to different detection needs, and achieves fast and accurate alarm triggering and reset.
Smart Images
Figure CN121253850B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of accelerometers, in particular to a contact type alarm output device for a mechanical accelerometer. BACKGROUND
[0002] The mechanical accelerometer is a sensor based on the principle of inertia, which is used for detecting the acceleration or vibration state of an object and triggering an alarm when the set threshold is exceeded. Although the traditional electronic accelerometer has high precision, its reliability is insufficient in some harsh environments (such as strong electromagnetic interference, high temperature, high impact, etc.), and it needs external power supply, which increases the complexity of the system. Therefore, the pure mechanical acceleration alarm device has important application value in the fields of industrial safety, transportation, military equipment, etc. due to its simple structure, no power supply and strong anti-interference ability.
[0003] The existing mechanical acceleration alarm device usually adopts a mass-spring structure. When the acceleration exceeds the threshold, the inertial force drives the mechanical contact to close or open, thereby outputting an alarm signal. However, such devices have the following problems: insufficient contact reliability: the traditional design is prone to false touch or poor contact in a vibration environment, resulting in unstable signal output. SUMMARY
[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a contact type alarm output device for a mechanical accelerometer. The metal spring sheet and the second contact adopt a point contact design, and the mechanical pushing of the conical sleeve ensures that the contact is tight and reliable when the alarm is triggered.
[0005] The purpose of the present application is achieved by the following technical solutions:
[0006] A contact type alarm output device for a mechanical accelerometer, comprising:
[0007] A dome-shaped shell having a first cavity formed therein;
[0008] A first contact and a second contact, the dome-shaped shell having the first contact and the second contact inserted therein, the second contact being riveted to the dome-shaped shell;
[0009] A first alarm output lead and a second alarm output lead, the first alarm output lead being connected to one end of the first contact inserted outside the dome-shaped shell, and the second alarm output lead being connected to one end of the second contact inserted outside the dome-shaped shell;
[0010] A metal spring sheet, one end of the metal spring sheet being fixedly connected to the first contact, and the other end of the metal spring sheet being in point contact with the second contact.
[0011] Preferably, an alarm output resistor is connected between the first alarm output lead and the second alarm output lead.
[0012] Preferably, the alarm output resistor is a fixed resistor with a resistance of 1Ω-10Ω.
[0013] Preferably, the first cavity is provided with a transverse shaft, a first spring and a conical sleeve are sleeved on the transverse shaft, the first spring is fixedly connected with the transverse shaft, the conical sleeve is in sliding fit with the transverse shaft, and the first spring is used to push the conical sleeve to displace on the transverse shaft, so as to drive the metal spring sheet to move towards one end of the second contact.
[0014] Preferably, the transverse shaft is provided with a colored indicating ring.
[0015] Preferably, the dome-shaped shell is made of transparent material, so as to facilitate observation of the colored indicating ring.
[0016] Preferably, an anti-rotation structure is arranged at a gap between the transverse shaft and the conical sleeve, the anti-rotation structure is supported by the transverse shaft and limits rotation of the conical sleeve in sliding.
[0017] Preferably, the anti-rotation structure comprises an ear plate, the ear plate is distributed on a surface of the transverse shaft along an axis direction of the transverse shaft, the ear plate is integrally welded with the transverse shaft, and a first square groove matched with the ear plate is formed in an inner wall of the conical sleeve.
[0018] The present application has the following beneficial effects:
[0019] The optimized contact structure of the present application adopts point contact design of the metal spring sheet and the second contact, combines mechanical pushing of the conical sleeve, ensures close contact and reliable conduction when the alarm is triggered, avoids false touch or poor contact caused by vibration or impact, flexibly adapts to different detection requirements through external alarm output resistor or direct detection of on-off state, improves system compatibility, adopts transparent dome-shaped shell and colored indicating ring on the transverse shaft, can directly observe displacement state of the conical sleeve, is convenient for quickly judging alarm triggering or resetting, reduces maintenance complexity, adopts pure mechanical structure design, does not need external power supply, is not affected by electromagnetic interference, is suitable for high-temperature, high-vibration and strong electromagnetic environment, and adopts spring-conical sleeve linkage mechanism: after the limiting component is unblocked, the spring immediately pushes the conical sleeve to slide, and quickly triggers the alarm; when resetting, the limiting component restraints the sleeve position, and ensures timely and accurate state switching. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the present application;
[0021] Figure 2 It is a schematic diagram of the connection structure of the conical sleeve and the transverse shaft of the present application;
[0022] Figure 3 Fig. 1 is a schematic view of the side structure of the application; Figure 2
[0023] Figure 4 Fig. 2 is a schematic view of the enlarged structure at A in the application; Figure 3
[0024] Figure 5 Fig. 3 is a schematic view of the structure of the first slide and the second slide in the application;
[0025] Figure 6 Fig. 4 is a schematic view of the side structure of the metal spring sheet in the application;
[0026] Figure 7 Fig. 5 is a schematic view of the top structure of the metal spring sheet in the application;
[0027] Figure 8 Fig. 6 is a schematic view of the internal structure of the dome shell in the application;
[0028] In the figure, 1 is a dome shell, 101 is a first cavity, 2 is a first contact, 3 is a second contact, 4 is a first alarm output lead, 5 is a second alarm output lead, 6 is a metal spring sheet, 7 is an alarm output resistor, 8 is a horizontal shaft, 9 is a first spring, 10 is a conical sleeve, 1001 is a first square groove, 1002 is a second dovetail groove, 11 is a colored indicating ring, 12 is an ear plate, 13 is a guide seat, 14 is a first slide, 15 is a second slide, 16 is a first mounting plate, 17 is a first dovetail block, 18 is a bottom plate, 19 is a universal ball, 20 is a limiting assembly, 21 is a vertical spring, and 22 is a sliding block. DETAILED DESCRIPTION
[0029] Example 1
[0030] As Figures 1-8 As shown, a contact type alarm output device for a mechanical accelerometer is provided, comprising: a dome-shaped shell 1, a first contact 2, a second contact 3, a first alarm output lead 4, a second alarm output lead 5 and a metal spring sheet 6, the dome-shaped shell 1 is provided with a first cavity 101; the first cavity 101 can provide installation space for the metal spring sheet 6, a horizontal shaft 8, a first spring 9 and a conical sleeve 10; the dome-shaped shell 1 is inserted with the first contact 2 and the second contact 3 (the second contact 3 is riveted with the dome-shaped shell 1); the first alarm output lead 4 is connected to the first contact 2 inserted to one end outside the dome-shaped shell 1, and the second alarm output lead 5 is connected to the second contact 3 inserted to one end outside the dome-shaped shell 1; the mechanical package accelerometer alarm and working state are led out, one end of the metal spring sheet 6 is fixedly connected to the first contact 2 (riveted), and the other end of the metal spring sheet 6 is in point contact with the second contact 3. The metal spring sheet 6 has a certain elasticity, which ensures that the metal spring sheet 6 is disconnected or in contact with the second contact 3 when there is no alarm signal output, and ensures the accurate output of the circuit signal; the outer surface of the metal spring sheet 6 is gold (silver) plated: to prevent rust or be affected by salt spray, high temperature and high humidity and the like.
[0031] An alarm output resistor 7 is connected between the first alarm output lead 4 and the second alarm output lead 5, that is, a fixed value resistor is added at the output end, when there is no alarm signal output, the measured value between the two ends is the resistance value of the resistor; when an alarm signal is output, the measured value between the two ends is a resistance value close to 0Ω (less than 10Ω). When the fixed value resistor is removed from the output end, when there is no alarm signal output, the measured resistance value between the two ends is infinite; when an alarm signal is output, the measured value between the two ends is a resistance value close to 0Ω (less than 10Ω). The alarm output resistor 7 is a fixed value resistor of 1Ω-10Ω.
[0032] The first cavity 101 is provided with the horizontal shaft 8, the horizontal shaft 8 is provided with the first spring 9 and the conical sleeve 10, the first spring 9 is fixedly connected with the horizontal shaft 8, and the conical sleeve 10 is in sliding fit with the horizontal shaft 8; the first spring 9 is used to push the conical sleeve 10 to displace on the horizontal shaft 8, so as to drive the metal spring sheet 6 to move towards one end of the second contact 3. When the subsequent limiting assembly axially jumps (jumps downward along the axial direction), the limiting assembly does not block the displacement of the conical sleeve 10, under the pushing of the first spring 9, the conical sleeve 10 moves along the surface of the horizontal shaft 8, the conical sleeve 10 pushes the metal spring sheet 6 to be in point contact with the second contact 3, and the accurate indication and output of the alarm signal are realized, wherein, Figure 8As shown, C is the axis, meaning the limiting component moves up and down along axis C. The limiting component consists of two parts: a vertical spring 21 and a slider 22. The bottom of the vertical spring 21 abuts against the bottom of the cavity of the dome shell 1, and the top of the vertical spring 21 contacts the slider 22. When the vertical spring 21 is compressed, it can push the slider 22 to move upward along axis C in the cavity of the dome shell 1, so that the top of the slider 22 abuts against the side of the conical sleeve 10. After being subjected to the downward acceleration force along axis C, the slider 22 moves downward along axis C in the cavity of the dome shell 1. The slider 22 exits the area that blocks the movement of the conical sleeve 10. The conical sleeve 10 is pushed laterally on the horizontal axis 8 by the force of the first spring 9.
[0033] The dome shell 1 is made of transparent material, and a colored indicator ring 11 (a conspicuous color such as red can be selected) is provided on the horizontal axis 8. The dome shell 1 is made of transparent material to facilitate the observation of the colored indicator ring 11 and to provide a better field of view when the conical sleeve 10 is pushed to reset.
[0034] In the initial position of the conical sleeve, the contact end of the metal spring plate can contact the cylindrical surface of the mandrel for limiting. Simultaneously, the fixed end of the metal spring plate is wider and less prone to bending, ensuring that the metal spring plate does not contact the conical sleeve and preventing the movement of the conical sleeve from being affected by the pressure of the metal spring plate. The first contact point serves as the first fixed point of the metal spring plate. When the conical sleeve moves from left to right, after contacting the metal spring plate, it pushes the right end of the metal spring plate upwards. Because the width of the spring plate gradually decreases from left to right, the deformation area of the metal spring plate is concentrated in the middle part. The fixed end has the greatest strength and the least deformation, while the contact end, in its free state, is unaffected by force and has almost no deformation, allowing it to smoothly contact the metal spring plate. After contact, the metal spring sheet begins to deform at its narrowest point under the combined force of the conical sleeve and the contact point. This ensures that the conical sleeve smoothly reaches the limit position, while also ensuring reliable contact by utilizing the pressure of the conical sleeve and the second contact point. The purpose of controlling the deformation area of the metal spring sheet is threefold: first, to ensure that the conical sleeve is completely unaffected by the pressure of the metal spring sheet during its functional operation, thereby improving the overall reliability of the product; second, to ensure reliable contact of the conductive contacts; and third, to prevent unpredictable deformation of the metal spring sheet, which could lead to unforeseen problems. The width change of the metal spring sheet is gradual, preventing stress concentration that could damage the spring sheet, and also making the deformation process of the spring sheet smoother.
[0035] like Figure 6 and Figure 7As shown, the metal spring sheet adopts a three-section design (i.e. b1 is a first section of straight line type and is connected with the first contact 2 to ensure strength; b2 is a lower concave small arc shape and reduces the width to ensure moderate reduction in strength and certain elasticity; b3 is an upper concave large arc shape to ensure that the contact is far away and to ensure certain strength when reliable contact is ensured, and b4 is a contact part with the second contact 3).
[0036] Working principle:
[0037] When in normal state: the metal spring sheet 6 is disconnected from the second contact 3 under the elastic action of itself, and in the circuit output, if the alarm output resistor 7 is installed: the resistance value between the first and second leads is a fixed external resistor (1Ω-10Ω), and if the alarm output resistor 7 is not installed: the resistance between the leads is infinite (open circuit), the conical sleeve 10 is not pushed, the conical sleeve 10 covers the colored indicating ring 11, and through the transparent dome-shaped shell 1, no abnormalities can be seen, and the colored indicating ring 11 cannot be seen;
[0038] When the alarm is triggered (acceleration exceeds the threshold), when the acceleration exceeds the threshold, the limiting component jumps downward along the axial direction, the blocking of the conical sleeve 10 is removed, the first spring 9 pushes the conical sleeve 10 to slide along the horizontal shaft 8, the conical surface of the conical sleeve 10 presses the free end of the metal spring sheet 6, the metal spring sheet 6 is pressed and reliably contacts the second contact 3, a conduction loop is formed, and whether an alarm resistor is externally connected, the resistance between the leads is reduced to close to 0Ω (<10Ω, i.e. short circuit state), the displacement of the conical sleeve 10 drives the colored indicating ring 11 to be visible, and the color change can be seen through the transparent shell, which directly indicates the alarm state;
[0039] When resetting is needed, the limiting component resets: when the acceleration returns to normal, the limiting component resets and blocks the conical sleeve 10 again, the first spring 9 is compressed: the conical sleeve 10 is pushed back to the initial position, the metal spring sheet 6 elastically recovers and is disconnected from the second contact 3, the circuit returns: the resistance between the leads returns to the normal value (fixed resistor or infinite); the colored indicating ring 11 returns to the original position, visual confirmation: the colored indicating ring 11 is completely blocked by the conical sleeve 10, the conical sleeve 10 returns to the original position, and the alarm state is removed.
[0040] Example two:
[0041] As Figures 2-5As shown, the gap between the horizontal shaft 8 and the conical sleeve 10 is provided with an anti-rotation structure, which supports the horizontal shaft 8 and limits the rotation of the conical sleeve 10 during sliding, ensuring that the conical sleeve 10 does not rotate when moving on the horizontal shaft 8, avoiding damage to the first spring 9 caused by the rotation of the conical sleeve 10 when an external force pushes the conical sleeve 10 to reset. The anti-rotation structure includes an ear plate 12 distributed on the surface of the horizontal shaft 8 along the axis direction of the horizontal shaft 8, and the ear plate 12 is welded with the horizontal shaft 8 as a whole. A first square groove 1001 is formed on the inner wall of the conical sleeve 10 to cooperate with the ear plate 12. The ear plate 12 is embedded in the first square groove 1001. When the conical sleeve 10 tries to rotate, the sidewall of the square groove will be blocked by the ear plate 12, thereby effectively limiting any rotation tendency and allowing it to slide only in the direction of the ear plate 12 (i.e. axial direction). In order to make the conical sleeve 10 move more smoothly, a first square groove 1001 can be formed on the left and right sides of the conical sleeve 10, and an ear plate 12 is installed on the corresponding position of the horizontal shaft 8. In order to reduce the wear of the conical sleeve 10 during axial sliding on the horizontal shaft 8, a slide seat is installed on the top and bottom of each first square groove 1001, which are a first slide seat 14 and a second slide seat 15. The two slide seats are installed on the upper and lower sides of the first square groove 1001, and the ear plate 12 is between the two slide seats, which can ensure that the conical sleeve 10 does not shake up and down during sliding on the surface of the horizontal shaft 8. Further, in order to avoid the conical sleeve 10 from shaking left and right during sliding on the surface of the horizontal shaft 8, a guide seat 13 corresponding to the slide seat is installed on the upper and lower sides of the ear plate 12. An arc-shaped groove is formed on the guide seat 13 to cooperate with the corresponding slide seat to limit the left and right shaking while sliding. The two slide seats are detachably connected to the inner wall of the first square groove 1001, which is convenient for disassembly. A second dovetail groove 1002 is formed on the top and bottom of the first square groove 1001, and the corresponding slide seat is inserted into the corresponding second dovetail groove 1002. The first slide seat 14 and the second slide seat 15 are of the same structure, and each slide seat includes a first mounting plate 16, a first dovetail block 17, a bottom plate 18 and a plurality of universal balls 19. The first mounting plate 16 is connected to the conical sleeve 10 by a first fastener, and the first mounting plate 16 is provided with a first dovetail block 17 at the bottom to cooperate with the second dovetail groove 1002. The first mounting plate 16 and the first dovetail block 17 are connected as a whole by a second fastener. A plurality of universal balls 19 are equally spaced and fixedly connected to the first dovetail block 17. The plurality of universal balls 19 cooperate with the arc-shaped groove of the guide seat 13. In summary, the core of this structure is an anti-rotation sliding sleeve system. The main purpose is to ensure that the conical sleeve 10 can strictly slide along the axis direction of the horizontal shaft 8 in a straight line, and cannot rotate around the axis.The anti-rotation is to protect the first spring 9 inside from being damaged due to the torsional deformation of the sleeve when the sleeve is reset. The anti-rotation function is mainly realized by the cooperation principle of a key and a key groove, and is assisted by precise sliding guide design to ensure stability and low wear. In order to eliminate the up-down and left-right shaking of the sleeve when sliding, two-stage guide is designed to prevent up-down shaking and left-right shaking. The detachable sliding seat is convenient for maintenance and replacement.
Claims
1. A contact-type alarm output device for a mechanical accelerometer, characterized in that, include: The dome shell (1) has a first cavity (101). The dome shell (1) has a first contact (2) and a second contact (3), and the second contact (3) is riveted to the dome shell (1). The first alarm output lead (4) and the second alarm output lead (5) are connected to the first contact (2) and inserted to the outside of the dome housing (1). The second alarm output lead (5) is connected to the second contact (3) and inserted to the outside of the dome housing (1). A metal spring sheet (6) is fixedly connected at one end to the first contact point (2), and the other end of the metal spring sheet (6) is in point contact with the second contact point (3); The first cavity (101) is equipped with a horizontal shaft (8), on which a first spring (9) and a conical sleeve (10) are sleeved. The first spring (9) is fixedly connected to the horizontal shaft (8), and the conical sleeve (10) is slidably engaged with the horizontal shaft (8). The first spring (9) is used to push the conical sleeve (10) to move on the horizontal shaft (8) to drive the metal spring plate (6) to move toward one end of the second contact point (3). The limiting component (20) includes a vertical spring (21) vertically disposed in the first cavity (101) and a slider (22) disposed on the vertical spring (21), the top of the slider (22) abutting against the side of the conical sleeve (10).
2. The contact-type alarm output device for a mechanical accelerometer according to claim 1, characterized in that, An alarm output resistor (7) is connected between the first alarm output lead (4) and the second alarm output lead (5).
3. A contact-type alarm output device for a mechanical accelerometer according to claim 2, characterized in that, The alarm output resistor (7) is a fixed resistor of 1Ω-10Ω.
4. A contact-type alarm output device for a mechanical accelerometer according to claim 1, characterized in that, The horizontal axis (8) is provided with a colored indicator ring (11).
5. A contact-type alarm output device for a mechanical accelerometer according to claim 4, characterized in that, The dome shell (1) is made of transparent material to facilitate observation of the colored indicator ring (11).
6. A contact-type alarm output device for a mechanical accelerometer according to claim 1, characterized in that, An anti-rotation structure is provided at the gap between the horizontal shaft (8) and the conical sleeve (10). The anti-rotation structure is supported by the horizontal shaft (8) and restricts the conical sleeve (10) from rotating during sliding.
7. A contact-type alarm output device for a mechanical accelerometer according to claim 6, characterized in that, The anti-rotation structure includes an ear plate (12), which is distributed on the surface of the horizontal axis (8) along the axial direction of the horizontal axis (8). The ear plate (12) is welded to the horizontal axis (8) as a whole. A first square groove (1001) that mates with the ear plate (12) is provided on the inner wall of the conical sleeve (10).
Citation Information
Patent Citations
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CN113436930A
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