Equal-strength beam high-precision force sensor

Abstract

The present invention discloses an equal-strength beam high-precision force sensor, which relates to the technical field of sensors. The force sensor includes a detection box and a sensor body disposed inside for obtaining pressure information. At the upper end of the detection box where the upper end of the sensor body is located, there is a force-bearing unit. The force-bearing unit includes a sliding opening formed in the middle position of the upper end of the detection box. A piston column is slidably disposed at the position of the sliding opening. The upper end of the piston column is fixedly connected to the inner top of the piston sleeve. The outer side of the lower end of the piston sleeve is slidably disposed with the outer side of the detection box. A sealing ring is provided between the piston sleeve and the detection box. The present invention is designed in view of the drawbacks of existing products, can buffer the force, and at the same time when there is pressure overload, the present application can also set the sensor body to no-load to avoid damage to the sensor body, so that the measurement range is always within its range, ensuring the measurement accuracy and strong practicability.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and specifically to an equal-strength beam high-precision force sensor. Background Art

[0002] A sensor is a detection device that can sense the information to be measured and transform the sensed information into an electrical signal or other required form of information output according to a certain rule to meet the requirements of information transmission, processing, storage, display, recording, and control. The characteristics of sensors include miniaturization, digitization, intelligence, multi-functionality, systematization, and networking. It is the primary link for realizing automatic detection and automatic control. The existing similar products on the market cannot prevent dust from entering the interior of the sensor body during use. The patent with the publication number CN209589313U discloses a high-precision force sensor. Although this device can prevent dust and maintain the accuracy of the sensor to a certain extent, the setting of this sensor lacks self-protection. Since each force sensor has an upper limit value, when the pressure it receives is higher than its upper limit, the sensor itself will be damaged, resulting in a reduction in its accuracy.

[0003] Based on this, an equal-strength beam high-precision force sensor is now provided to eliminate the drawbacks of existing devices. Summary of the Invention

[0004] The purpose of the present invention is to provide an equal-strength beam high-precision force sensor to solve the problems in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The equal-strength beam high-precision force sensor includes a detection box and a sensor body disposed inside for obtaining pressure information. At the upper end of the detection box where the upper end of the sensor body is located, there is a force-receiving unit. The force-receiving unit includes a sliding opening formed in the middle position at the upper end of the detection box. A piston column is slidably disposed at the position of the sliding opening. The upper end of the piston column is fixedly connected to the inner top of the piston sleeve. The outer side of the lower end of the piston sleeve is slidably disposed with the outer side of the detection box. A sealing ring is provided between the piston sleeve and the detection box. A transmission pressing plate is provided at the lower end of the piston column. The upper end of the transmission pressing plate is fixedly connected to the inner top of the detection box through a third spring. A buffer backing plate corresponding to the detection end of the sensor body is provided at the lower end of the transmission pressing plate. A protective sleeve is provided on the outer side of the lower end of the detection box. An overload tripping mechanism for protecting the sensor body is provided at the bottom of the detection box.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In an alternative embodiment: The overload tripping mechanism includes horizontal chutes symmetrically arranged on both sides of the lower end of the detection box. A pressure plate is slidably arranged in each horizontal chute. A support plate is horizontally arranged at the lower end of the pressure plate. An active bayonet is arranged at the middle position of the bottom of the detection box. The active bayonet cooperates with the sensor body. The upper end of the support plate contacts the bottom of the sensor body. A support seat group is arranged at the bottom of the sensor body. A guiding member is arranged between the outer side of the pressure plate and the inner wall of the detection box. A slope is symmetrically arranged on both sides of the lower end of the transmission pressure plate. A guiding slope is arranged on the outer side of the lower end of the slope and cooperates with the upper end of the pressure plate.

[0009] In an alternative embodiment: A reset push rod is arranged at the middle position of the lower end of the sensor body. The lower end of the reset push rod passes through a reset through hole at the bottom of the protective sleeve. A reset slope is arranged at the lower end of the support plate and cooperates with the support seat group.

[0010] In an alternative embodiment: A sealing ring that cooperates with the outer side of the reset push rod is arranged on the inner wall of the reset through hole.

[0011] In an alternative embodiment: The support seat group includes a buffer seat arranged at the lower end of the sensor body. An installation groove that cooperates with the sensor body is arranged at the upper end of the buffer seat. A piston chamber is arranged inside the buffer seat. A buffer bottom plate is slidably arranged inside the piston chamber. The lower end of the buffer bottom plate is fixedly connected to the inner bottom of the piston chamber through a first spring. An iron sheet that cooperates with the magnet at the bottom of the sensor body is arranged at the upper end of the buffer bottom plate.

[0012] In an alternative embodiment: A clearance fit is provided between the installation groove and the sensor body.

[0013] In an alternative embodiment: A rounded corner that cooperates with the slope is arranged at the upper end of the pressure plate.

[0014] In an alternative embodiment: A threaded ring is arranged on the outer side of the upper end of the protective sleeve. The threaded ring cooperates with the external thread on the outer side of the detection box.

[0015] In an alternative embodiment: The guiding member includes a horizontal through hole arranged on the pressure plate. An auxiliary guiding rod is slidably arranged in the horizontal through hole. The outer end of the auxiliary guiding rod is fixedly connected to the inner wall of the detection box. A second spring is sleeved on the outer side of the auxiliary guiding rod. The second spring fixedly connects the pressure plate and the inner wall of the detection box.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The present invention is designed for the drawbacks of existing products, can buffer the force, and at the same time when pressure overload occurs, the present application can also set the sensor body to no-load to avoid damage to the sensor body, so that the measurement range is always within its range, ensuring the measurement accuracy and strong practicability. Brief Description of the Drawings

[0018] Figure 1 This is a schematic structural diagram of the present invention.

[0019] Figure 2 This is a schematic structural diagram of the interior of the present invention.

[0020] Figure 3 This is a schematic structural diagram of the pressure plate of the present invention.

[0021] Figure 4 This is a schematic structural diagram of the bottom of the detection box of the present invention.

[0022] Annotation of reference numerals in the drawings: detection box 11, piston column 12, piston sleeve 13, support plate 14, movable bayonet 15, buffer bottom plate 16, sensor body 17, piston chamber 18, first spring 19, protective sleeve 20, horizontal chute 21, second spring 22, threaded ring 23, pressure plate 24, inclined block 25, transmission pressure plate 26, third spring 27, buffer seat 28, reset inclined plane 29, auxiliary guide rod 30, reset push rod 31. Detailed Description of the Invention

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] In one embodiment, as Figures 1 - 4As shown in the figure, an equal-strength beam high-precision force sensor includes a detection box 11 and a sensor body 17 disposed inside for obtaining pressure information. At the upper end of the detection box 11 where the upper end of the sensor body 17 is located, there is a force-bearing unit. The force-bearing unit includes a sliding opening formed in the middle position of the upper end of the detection box 11. A piston column 12 is slidably disposed at the position of the sliding opening. The upper end of the piston column 12 is fixedly connected to the inner top of the piston sleeve 13. The outer side of the lower end of the piston sleeve 13 is slidably disposed with the outer side of the detection box 11. A sealing ring is provided between the piston sleeve 13 and the detection box 11. When a force is applied, the piston sleeve 13 will slide along the surface of the detection box 11. Here, since it is a sliding seal, there is no need to worry about dust and rainwater entering the detection box 11. A transmission pressure plate 26 is provided at the lower end of the piston column 12. The upper end of the transmission pressure plate 26 is fixedly connected to the inner top of the detection box 11 through a third spring 27. A buffer cushion plate corresponding to the detection end of the sensor body 17 is provided at the lower end of the transmission pressure plate 26. By providing the buffer cushion plate, the instantaneous impact force of the force is reduced, forming a protection for the sensor body 17. A protective sleeve 20 is provided on the outer side of the lower end of the detection box 11. An overload tripping mechanism for protecting the sensor body 17 is provided at the bottom of the detection box 11. When the force value received by the sensor body 17 is greater than its upper limit, the overload tripping mechanism makes the sensor body 17 in an unloaded state, thereby protecting it, so that the measurement range of the sensor body 17 is always within its measurement range, ensuring the measurement accuracy;

[0025] The overload tripping mechanism includes horizontal chutes 21 symmetrically disposed on both sides of the lower end of the detection box 11. A pressure-receiving plate 24 is slidably disposed in each horizontal chute 21. A support plate 14 is horizontally provided at the lower end of the pressure-receiving plate 24. An active bayonet 15 is provided at the middle position of the bottom of the detection box 11. The active bayonet 15 cooperates with the sensor body 17. The upper end of the support plate 14 contacts the bottom of the sensor body 17. A support seat group is provided at the bottom of the sensor body 17. A guiding member is provided between the outer side of the pressure-receiving plate 24 and the inner wall of the detection box 11. An inclined block 25 is symmetrically provided on both sides of the lower end of the transmission pressure plate 26. A guiding inclined surface cooperating with the upper end of the pressure-receiving plate 24 is provided on the outer side of the lower end of the inclined block 25. When the transmission pressure plate 26 moves downward, the guiding inclined surface of the inclined block 25 will exert a force on the pressure-receiving plate 24, so that the pressure-receiving plate 24 slides outward along the horizontal chute 21 until the lower end of the support plate 14 is withdrawn from the bottom of the sensor body 17. At this time, the sensor body 17 loses the supporting force and will fall into the protective sleeve 20, thereby quickly removing the force received by the sensor body 17 and preventing the sensor body 17 from being overloaded;

[0026] A reset push rod 31 is provided at the middle position of the lower end of the sensor body 17. The lower end of the reset push rod 31 passes through a reset through hole at the bottom of the protective sleeve 20. A sealing ring that matches the outer side of the reset push rod 31 is provided on the inner wall of the reset through hole. A reset inclined surface 29 that matches the support seat group is provided at the lower end of the support plate 14. In the later stage, the sensor body 17 can be pushed upward by the reset push rod 31, so that the sensor body 17 slides upward to above the support plate 14, thereby completing the reset;

[0027] The support seat group includes a buffer seat 28 provided at the lower end of the sensor body 17. An installation groove that matches the sensor body 17 is provided at the upper end of the buffer seat 28. A piston chamber 18 is provided inside the buffer seat 28. A buffer bottom plate 16 is slidably provided inside the piston chamber 18. The lower end of the buffer bottom plate 16 is fixedly connected to the inner bottom of the piston chamber 18 through a first spring 19. An iron sheet that matches the bottom magnet of the sensor body 17 is provided at the upper end of the buffer bottom plate 16. When the sensor body 17 is stressed, the buffer bottom plate 16 will slide along the inner wall of the piston chamber 18, thereby buffering the bottom of the sensor body 17;

[0028] A clearance fit is provided between the installation groove and the sensor body 17, which is convenient for disassembly, installation and replacement in the later stage;

[0029] A fillet that matches the inclined block 25 is provided at the upper end of the pressure-bearing plate 24, which helps to reduce wear between components;

[0030] A threaded ring 23 is provided on the outer side of the upper end of the protective sleeve 20. The threaded ring 23 matches the external thread on the outer side of the detection box 11. In this way, it is convenient to disassemble and install the protective sleeve 20 and facilitate later maintenance;

[0031] The guiding member includes a horizontal through hole provided on the pressure-bearing plate 24. An auxiliary guiding rod 30 is slidably provided in the horizontal through hole. The outer end of the auxiliary guiding rod 30 is fixedly connected to the inner wall of the detection box 11. A second spring 22 is sleeved on the outer side of the auxiliary guiding rod 30. The second spring 22 connects and fixes the pressure-bearing plate 24 to the inner wall of the detection box 11. The pressure-bearing plate 24 can slide along the surface of the auxiliary guiding rod 30. The second spring 22 is used to make the pressure-bearing plate 24 in a preset position.

[0032] The above embodiments disclose an equal-strength beam high-precision force sensor. Among them, in actual use, when the upper end of the piston sleeve 13 is subjected to a squeezing force, the piston sleeve 13 slides downward along the detection box 11, and the piston column 12 at the lower end of the piston sleeve 13 will drive the transmission pressing plate 26 to squeeze the detection end of the sensor body 17 downward. The sensor body 17 will obtain pressure information. When the pressure received exceeds the set value, the inclined surface of the inclined block 25 will push the two pressing plates 24 to move to both sides until the support plate 14 disengages from the lower end of the sensor body 17. At this time, the sensor body 17 is in an unloaded state, thereby protecting the sensor body 17 and ensuring the accuracy of its measurement. When it is necessary to reset the product, just press the reset push rod 31 forcefully. The reset push rod 31 will drive the sensor body 17 to move upward. Since the lower end of the support plate 14 is provided with a reset inclined surface 29, when the sensor body 17 is reset upward, the reset inclined surface 29 can guide the support plate 14 to move to both sides, so as to facilitate the sensor body 17 to return to the detection position.

[0033] As described above, the above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. High-precision equal-strength beam force sensor, including a detection box (11) and a sensor body (17) arranged inside for obtaining pressure information. A force-bearing unit is provided at the upper end of the detection box (11) where the upper end of the sensor body (17) is located; It is characterized in that The force-bearing unit includes a sliding opening formed in the middle position at the upper end of the detection box (11). A piston column (12) is slidably arranged at the position of the sliding opening. The upper end of the piston column (12) is fixedly connected to the inner top of the piston sleeve (13). The outer side of the lower end of the piston sleeve (13) is slidably arranged with the outer side of the detection box (11). A sealing ring is provided between the piston sleeve (13) and the detection box (11). A transmission pressure plate (26) is provided at the lower end of the piston column (12). The upper end of the transmission pressure plate (26) is fixedly connected to the inner top of the detection box (11) through a third spring (27); A buffer backing plate corresponding to the detection end of the sensor body (17) is provided at the lower end of the transmission pressure plate (26). A protective sleeve (20) is provided on the outer side of the lower end of the detection box (11). An overload tripping mechanism for protecting the sensor body (17) is provided at the bottom of the detection box (11); The overload tripping mechanism includes horizontal chutes (21) symmetrically arranged on both sides of the lower end of the detection box (11). A pressure-receiving plate (24) is slidably arranged in each horizontal chute (21). A support plate (14) is horizontally provided at the lower end of the pressure-receiving plate (24). An active bayonet (15) is provided at the middle position of the bottom of the detection box (11). The active bayonet (15) cooperates with the sensor body (17). The upper end of the support plate (14) contacts the bottom of the sensor body (17). A support seat group is provided at the bottom of the sensor body (17). A guiding member is provided between the outer side of the pressure-receiving plate (24) and the inner wall of the detection box (11). Oblique blocks (25) are symmetrically provided on both sides of the lower end of the transmission pressure plate (26). A guiding inclined surface cooperating with the upper end of the pressure-receiving plate (24) is provided on the outer side of the lower end of the oblique block (25); A reset push rod (31) is provided at the middle position of the lower end of the sensor body (17). The lower end of the reset push rod (31) passes through the reset through hole at the bottom of the protective sleeve (20). A reset inclined surface (29) cooperating with the support seat group is provided at the lower end of the support plate (14); The support seat group includes a buffer seat (28) provided at the lower end of the sensor body (17). An installation groove cooperating with the sensor body (17) is provided at the upper end of the buffer seat (28). A piston chamber (18) is provided inside the buffer seat (28). A buffer bottom plate (16) is slidably arranged inside the piston chamber (18). The lower end of the buffer bottom plate (16) is fixedly connected to the inner bottom of the piston chamber (18) through a first spring (19). An iron sheet cooperating with the bottom magnet of the sensor body (17) is provided at the upper end of the buffer bottom plate (16); The guiding member includes a horizontal perforation provided on the pressing plate (24), and an auxiliary guiding rod (30) is slidably disposed in the horizontal perforation. The outer end of the auxiliary guiding rod (30) is fixedly connected to the inner wall of the detection box (11). A second spring (22) is sleeved outside the auxiliary guiding rod (30), and the second spring (22) fixedly connects the pressing plate (24) and the inner wall of the detection box (11).

2. The equal-strength beam high-precision force sensor according to claim 1, wherein A sealing ring that cooperates with the outer side of the reset push rod (31) is provided on the inner wall of the reset perforation.

3. The equal-strength beam high-precision force sensor according to claim 1, characterized in that A clearance fit is provided between the installation groove and the sensor body (17).

4. The equal-strength beam high-precision force sensor according to claim 1, wherein, The upper end of the pressing plate (24) is provided with a rounded corner that cooperates with the inclined block (25).

5. The equal-strength beam high-precision force sensor according to claim 1, characterized in that A threaded ring (23) is provided on the outer side of the upper end of the protective sleeve (20), and the threaded ring (23) cooperates with the external thread on the outer side of the detection box (11).

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