Retraction protection device, protection method and use thereof in displacement sensor

Abstract

The application discloses a retraction protection device, a protection method and application thereof in a displacement sensor, and belongs to the technical field of displacement sensors, comprising a mounting plate, the top of the mounting plate is fixed with a protection frame along the length direction, the top end of the protection frame is in an open state, and a linear displacement sensor is arranged on the top of the protection frame along the length direction. The linear displacement sensor is fixed in the rectangular frame through the arrangement of a hidden avoidance mechanism in the protection frame, a connecting mechanism is arranged between the end of the push rod of the linear displacement sensor and the measured object, mechanical detection can be conducted on the force during retraction in the process that the measured object drives the push rod to retract, the hidden avoidance mechanism controls the separation between the linear displacement sensor and the measured object after the impact force exceeds the set threshold value, and the linear displacement sensor is hidden towards the inside of the protection frame, so that the linear displacement sensor is protected, and the use safety of the linear displacement sensor is ensured.

Description

Technical Field

[0001] This invention relates to a retraction protection device, and particularly to the application of a retraction protection device in a displacement sensor. This invention also relates to a retraction protection method, and particularly to the application of a retraction protection method in a displacement sensor, belonging to the field of displacement sensor technology. Background Technology

[0002] Currently, linear displacement sensors are used by fixing the housing to the base of the device and connecting the push rod to the object being measured. However, under complex working conditions (such as collisions or harsh environments), there is a lack of effective protection when the push rod retracts. In the event of a collision, the instantaneous high impact force can cause displacement of the precision structure inside the sensor (such as the grating ruler and magnetostrictive waveguide wire), resulting in signal fluctuations or zero drift. In addition, when the push rod of the linear displacement sensor is exposed to the external environment, it is easy for dust, particles and other contaminants to enter during retraction, leading to mechanical jamming, accelerated wear or abnormal signal.

[0003] To address these issues, a retraction protection device and method were designed, along with their application in displacement sensors. Summary of the Invention

[0004] The main objective of this invention is to provide a retraction protection device, protection method, and its application in displacement sensors. By incorporating a concealed avoidance mechanism consisting of a side plate, inclined groove, slider, sleeve, rectangular groove, rectangular rod, tension spring, sliding rod, rectangular frame, and a first positioning screw within the protective frame, the linear displacement sensor is fixed inside the rectangular frame. A connecting mechanism consisting of a lower trapezoidal block, upper trapezoidal block, vertical plate, oblong groove, and a second positioning screw is provided between the end of the linear displacement sensor push rod and the measured object. This mechanism allows for mechanical detection of the retraction force during the retraction process caused by the measured object. When the impact force exceeds a set threshold, the concealed avoidance mechanism controls the separation of the linear displacement sensor from the measured object, causing it to retract into the protective frame, thus protecting the linear displacement sensor and ensuring its safe use. This is achieved by incorporating concealed avoidance mechanisms at both ends of the mounting plate. The elevation mechanism, composed of a vertical groove, pad block, screw, threaded groove, and adjusting block, can adjust the coaxiality of the push rod and the measured object according to the direction of movement of the measured object when using the linear displacement sensor. This avoids radial force on the push rod during the movement of the measured object, which could cause measurement drift, jamming, or even mechanical breakage. An anti-impact mechanism, consisting of a cylinder, piston, buffer spring, connecting rod, collar, L-shaped rod, and strip groove at the bottom of the carrier plate, absorbs the inertial impact force during retraction, reducing damage to the sensor from rigid collisions. Furthermore, in conjunction with an air pipe and air groove, the end of the air pipe is connected to the one-way exhaust valves of the air groove and cylinder, allowing compressed air to clean the outer surface of the push rod during retraction. This prevents dust from entering the linear displacement sensor and affecting the measurement results, thus improving functionality.

[0005] The objective of this invention can be achieved by adopting the following technical solution:

[0006] A retraction protection device, used in displacement sensors, includes a mounting plate. A protective frame is fixed to the top of the mounting plate along the length direction. The top of the protective frame is open. A linear displacement sensor is installed on the top of the protective frame along the length direction. A hidden avoidance mechanism for controlling the tilting and downward movement of the linear displacement sensor is provided in the middle of the protective frame.

[0007] Both ends of the bottom of the mounting plate are equipped with a heightening mechanism for coaxial adjustment of the linear displacement sensor and the object being measured.

[0008] A connecting mechanism is provided between the end of the push rod on the linear displacement sensor and the object being measured;

[0009] The protective frame has an opening at one end of the push rod near the linear displacement sensor. A carrier plate is horizontally placed at the bottom of the opening near the inside of the protective frame. An anti-impact mechanism is provided at the bottom of the carrier plate to absorb the inertia of the push rod's retraction.

[0010] The top of the carrier plate is equipped with a dust removal mechanism that uses compressed air to clean the ends of the push rods;

[0011] The top of the protective frame away from the opening is provided with a wire groove, and a reset mechanism for pushing the linear displacement sensor upward is provided below the wire groove.

[0012] Preferably, the raising mechanism includes a vertical groove, a pad, a screw, a threaded groove, and an adjusting block. The vertical groove is opened at the bottom end of the mounting plate and is parallel to the width direction of the mounting plate. The pad is vertically slidably arranged inside the vertical groove. The top of the vertical groove is rotatably installed with a screw. The top of the pad is provided with a threaded groove that mates with the screw. The top of the screw extends to the top of the mounting plate. The top of the screw is installed with an adjusting block.

[0013] Preferred: The concealed avoidance mechanism includes a side plate, a sloping groove, a slider, a sleeve, a rectangular groove, a rectangular rod, a tension spring, a sliding rod, and a limiting component. The side plates are symmetrically arranged on both sides of the bottom of the protective frame. The inner side of each side plate is inclined with a sloping groove. A slider is slidably arranged inside each sloping groove. A sleeve is vertically fixed between two sets of sliders. A rectangular groove is opened at the lower end of the sleeve. A rectangular rod is vertically slidably arranged inside the rectangular groove. A tension spring is fixed between the side of the rectangular rod away from the opening and the end of the protective frame. A sliding rod is fixed between the two ends of the protective frame. The sliding rod passes through the tension spring and the rectangular rod, and the sliding rod and the rectangular rod are slidably connected. A linear displacement sensor is fixed to the top of the sleeve. A limiting component is provided between the side of the sleeve and the end of the carrier plate.

[0014] Preferably, a rectangular frame is fixed to the top of the sleeve, a linear displacement sensor passes through the inside of the rectangular frame, and a first positioning screw is installed on the top of the rectangular frame.

[0015] Preferably, the limiting component includes a first permanent magnet and a second permanent magnet. The first permanent magnet is fixed to the end of the carrier plate, and the second permanent magnet is fixed to the side of the sleeve. The first permanent magnet and the second permanent magnet are magnetically attracted to each other.

[0016] Preferably, the connecting mechanism includes a lower trapezoidal block, an upper trapezoidal block, a vertical plate, a waist-shaped groove, and a second positioning screw. The lower trapezoidal block is fixed to the front end of the push rod on the linear displacement sensor, the vertical plate is fixed to the object being measured, the upper trapezoidal block is slidably arranged on the outer side of the vertical plate, the lower trapezoidal block, the upper trapezoidal block, and the inclined groove have the same inclination angle, the waist-shaped groove is vertically opened on the side of the vertical plate, and the second positioning screw is threaded on the side of the upper trapezoidal block, the second positioning screw passes through the waist-shaped groove.

[0017] Preferably, the impact-resistant mechanism includes a cylinder, a piston, a buffer spring, a connecting rod, a collar, an L-shaped rod, and a slotted groove. The cylinder is fixed to the bottom of the carrier plate. A one-way intake valve and a one-way exhaust valve are installed at the end of the cylinder. A piston is slidably arranged inside the cylinder. A buffer spring is provided between the piston and the end of the cylinder. A connecting rod is fixed to the outside of the piston. A collar is fixed to the end of the connecting rod. An L-shaped rod is vertically slidably arranged inside the collar. The top of the L-shaped rod is fixedly connected to the lower trapezoidal block. A slotted groove is provided on the carrier plate for the L-shaped rod to pass through and slide.

[0018] Preferably, the dust removal mechanism includes an air pipe and an air groove. The air pipe is installed on a one-way exhaust valve at the end of the cylinder. An air groove is provided on the top of the carrier plate at the position corresponding to the end of the push rod. The top of the air pipe is connected to the inside of the air groove.

[0019] Preferably, the reset mechanism includes an electric telescopic rod and a push plate. The electric telescopic rod is horizontally installed at the end of the protective frame, the output end of the electric telescopic rod extends into the interior of the protective frame, and the push plate is vertically installed at the output end of the electric telescopic rod.

[0020] This invention also provides a retraction protection method, applied in a displacement sensor, comprising the following steps:

[0021] Step 1: Before installation, adjust the shim mechanism, raise both ends of the bottom of the mounting plate, adjust the push rod on the linear displacement sensor to be coaxial with the object being measured, and then use bolts to fix the mounting plate in place.

[0022] Step 2: When in use, the linear displacement sensor is set parallel to the top of the protective frame, and the push rod on the linear displacement sensor is connected to the object being measured by the connecting mechanism. The object being measured drives the push rod to retract and move. During the sliding process, the anti-impact mechanism is used to suppress the inertial impact of the push rod when it retracts, and the dust removal mechanism is used to remove dust from the surface when the push rod retracts to avoid dust contamination and ensure the stable sliding of the push rod.

[0023] Step 3: When the instantaneous impact force applied by the object being tested to the linear displacement sensor exceeds the set threshold, the concealed avoidance mechanism drives the linear displacement sensor to tilt and move downward in a direction away from the object being tested, and disconnects it from the object being tested, thus concealing the linear displacement sensor inside the protective frame for protection.

[0024] Step 4: When the linear displacement sensor is reused, the reset mechanism pushes the linear displacement sensor diagonally upwards, moving the linear displacement sensor to the initial detection position. The connecting mechanism then reconnects the push rod to the object being measured.

[0025] The beneficial effects of this invention are as follows:

[0026] The retraction protection device, protection method, and their application in displacement sensors provided by this invention utilize a concealed avoidance mechanism consisting of a side plate, inclined groove, slider, sleeve, rectangular groove, rectangular rod, tension spring, sliding rod, rectangular frame, and first positioning screw, which fixes the linear displacement sensor inside the rectangular frame. A connecting mechanism consisting of a lower trapezoidal block, upper trapezoidal block, vertical plate, waist-shaped groove, and second positioning screw is provided between the end of the linear displacement sensor push rod and the object being measured. This mechanism can mechanically detect the force during the retraction of the push rod driven by the object being measured. When the impact force exceeds a set threshold, the concealed avoidance mechanism controls the separation of the linear displacement sensor from the object being measured and hides it towards the inside of the protective frame, protecting the linear displacement sensor and ensuring its safe use.

[0027] By setting a heightening mechanism consisting of vertical grooves, pads, screws, threaded grooves, and adjusting blocks at both ends of the bottom of the mounting plate, the linear displacement sensor can adjust the coaxiality of the push rod and the measured object according to the direction of movement of the measured object. This avoids the measured object from being subjected to radial force when moving, which could cause the push rod to drift, jam, or even break the measurement value.

[0028] By incorporating an anti-impact mechanism consisting of a cylinder, piston, buffer spring, connecting rod, collar, L-shaped rod, and strip groove at the bottom of the carrier plate, the mechanism can absorb the inertial impact force during retraction, reducing damage to the sensor from rigid collisions. Furthermore, when used in conjunction with an air pipe and air groove, with the end of the air pipe connected to the one-way exhaust valves of the air groove and cylinder respectively, compressed air can be used for dust removal during the push rod's retraction process. This cleans the outer surface of the push rod, preventing dust from entering the linear displacement sensor and affecting measurement results, thus improving its functionality. Attached Figure Description

[0029] Figure 1 This is a front sectional view of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention in its usage state.

[0030] Figure 2 This is a front sectional view of the protection state of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention;

[0031] Figure 3 This is a front view of the usage state of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention;

[0032] Figure 4 This is a side plate structure diagram of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention;

[0033] Figure 5 This is a structural diagram of the outer side of the sleeve of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention;

[0034] Figure 6 This is a connection mechanism diagram of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention;

[0035] Figure 7 This is a cross-sectional view of the carrier plate structure of a preferred embodiment of the retraction protection device, protection method and its application in a displacement sensor of the present invention;

[0036] Figure 8 This is a preferred embodiment of the retraction protection device, protection method, and their application in a displacement sensor according to the present invention. Figure 1 Enlarged view of point A in the middle.

[0037] In the diagram: 1. Mounting plate;

[0038] 2. Elevation mechanism; 201. Vertical groove; 202. Pad block; 203. Screw; 204. Threaded groove; 205. Adjusting block;

[0039] 3. Protective frame; 301 stainless steel cable tray;

[0040] 4. Concealed avoidance mechanism; 401. Side plate; 402. Inclined groove; 403. Slider; 404. Sleeve; 405. Rectangular groove; 406. Rectangular rod; 407. Tension spring; 408. Sliding rod; 409. Rectangular frame; 410. First positioning screw; 411. First permanent magnet; 412. Second permanent magnet;

[0041] 5. Linear displacement sensor;

[0042] 6. Connecting mechanism; 601. Lower trapezoidal block; 602. Upper trapezoidal block; 603. Vertical plate; 604. Waist-shaped groove; 605. Second positioning screw;

[0043] 7. Open opening; 8. Carrier plate;

[0044] 9. Impact-resistant mechanism; 901. Cylinder; 902. Piston; 903. Buffer spring; 904. Connecting rod; 905. Collar; 906. L-shaped rod; 907. Strip groove;

[0045] 10. Dust removal mechanism; 1001. Air pipe; 1002. Air tank;

[0046] 11. Reset mechanism; 1101. Electric telescopic rod; 1102. Push plate. Detailed Implementation

[0047] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0048] like Figures 1-8 As shown, this embodiment provides a retraction protection device, which is applied in a displacement sensor. It includes a mounting plate 1, a protective frame 3 fixed on the top of the mounting plate 1 along the length direction, the top of the protective frame 3 being open, a linear displacement sensor 5 being provided on the top of the protective frame 3 along the length direction, and a hidden avoidance mechanism 4 for controlling the linear displacement sensor 5 to tilt downward at the middle position of the protective frame 3.

[0049] Both ends of the bottom of the mounting plate 1 are equipped with a heightening mechanism 2 for coaxial adjustment of the linear displacement sensor 5 and the object being measured.

[0050] A connecting mechanism 6 is provided between the end of the push rod on the linear displacement sensor 5 and the object being measured;

[0051] The tested items are widely used in various fields such as industry, scientific research, medical care, and transportation. When monitoring the linear displacement of the worktable during the processing to ensure processing accuracy (such as CNC machine tools), the tested item can be the worktable. When detecting the conveying distance of the workpiece, the tested item can be the workpiece. This application does not list them all, and the selection can be made according to the actual use.

[0052] The protective frame 3 has an opening 7 at one end of the push rod near the linear displacement sensor 5. A carrier plate 8 is horizontally provided at the bottom of the opening 7 near the inside of the protective frame 3. An anti-impact mechanism 9 is provided at the bottom of the carrier plate 8 to absorb the retraction inertia of the push rod.

[0053] The top of the carrier plate 8 is provided with a dust removal mechanism 10 for cleaning the end of the push rod with compressed air;

[0054] The top of the protective frame 3 away from the opening 7 is provided with a wire groove 301, and a reset mechanism 11 for pushing the linear displacement sensor 5 upward is provided below the wire groove 301.

[0055] General working principle: Before installation, adjust the shim mechanism 2 according to usage requirements to raise both ends of the bottom of the mounting plate 1. Adjust the push rod on the linear displacement sensor 5 to be coaxial with the object being measured. Then, use bolts to fix the mounting plate 1 in place. During use, the linear displacement sensor 5 is positioned parallel to the top of the protective frame 3, and the push rod on the linear displacement sensor 5 is connected to the object being measured using the connecting mechanism 6. The object being measured drives the push rod to retract. During the sliding process, the anti-impact mechanism 9 suppresses the inertial impact of the push rod during retraction, and the dust removal mechanism 10 is used to prevent this impact during push rod retraction. Surface dust removal is performed regularly to avoid dust contamination and ensure stable sliding of the push rod. When the instantaneous impact force applied by the test object to the linear displacement sensor 5 exceeds the set threshold, the hiding and avoidance mechanism 4 drives the linear displacement sensor 5 to tilt and move downward away from the test object, and disengages from the test object. The linear displacement sensor 5 is then hidden inside the protective frame 3 for protection. When the linear displacement sensor 5 is reused, the reset mechanism 11 pushes the linear displacement sensor 5 diagonally upward, moves the linear displacement sensor 5 to the initial detection position, and the connecting mechanism 6 reconnects the push rod to the test object.

[0056] In this embodiment, the raising mechanism 2 includes a vertical groove 201, a pad 202, a screw 203, a threaded groove 204, and an adjusting block 205. The vertical groove 201 is opened at the bottom end of the mounting plate 1 and is parallel to the width direction of the mounting plate 1. The pad 202 is vertically slidably arranged inside the vertical groove 201. The top of the vertical groove 201 is rotatably mounted with a screw 203. The top of the pad 202 is provided with a threaded groove 204 that cooperates with the screw 203. The top of the screw 203 extends to the top of the mounting plate 1. The top of the screw 203 is mounted with an adjusting block 205.

[0057] Local working principle: During installation, the adjustment block 205 controls the rotation of the screw 203. The screw 203 rotates inside the threaded groove 204, controlling the pad 202 to move vertically inside the vertical groove 201. The pad 202 protrudes to the bottom of the mounting plate 1, adjusting the tilt angle of the mounting plate 1, thereby coaxially adjusting the linear displacement sensor 5 and the measured object.

[0058] In this embodiment, the concealed avoidance mechanism 4 includes a side plate 401, a sloping groove 402, a slider 403, a sleeve 404, a rectangular groove 405, a rectangular rod 406, a tension spring 407, a sliding rod 408, and a limiting assembly. The side plates 401 are symmetrically arranged on both sides of the bottom of the protective frame 3. The inner side of each side plate 401 is provided with a sloping groove 402. The inside of each sloping groove 402 is slidably arranged with a slider 403. A sleeve 404 is vertically fixed between two sets of sliders 403. A rectangular groove is opened at the lower end of the sleeve 404. 405. A rectangular rod 406 is vertically slidably arranged inside the rectangular groove 405. A tension spring 407 is fixed between the side of the rectangular rod 406 away from the opening 7 and the end of the protective frame 3. A sliding rod 408 is fixed between the two ends of the protective frame 3. The sliding rod 408 passes through the tension spring 407 and the rectangular rod 406, and the sliding rod 408 and the rectangular rod 406 are slidably connected. The linear displacement sensor 5 is fixed on the top of the sleeve 404. A limiting component is provided between the side of the sleeve 404 and the end of the carrier plate 8.

[0059] Local working principle: In the vertical state, the tension spring 407 is in a stretched state. Due to the presence of the limiting component, the side of the sleeve 404 is in contact with the end face of the carrier plate 8. The slider 403 is located at the top of the inclined groove 402. When the measured object moves the control push rod into the linear displacement sensor 5 and the instantaneous impact force applied to the linear displacement sensor 5 is higher than the set threshold, the limiting component releases the connection between the sleeve 404 and the carrier plate 8, the tension spring 407 resets, and the sleeve 404 tilts and moves down along the direction of the inclined groove 402, completely hiding the linear displacement sensor 5 inside the protective frame 3.

[0060] In this embodiment, a rectangular frame 409 is fixed to the top of the sleeve 404, the linear displacement sensor 5 passes through the inside of the rectangular frame 409, and a first positioning screw 410 is installed on the top of the rectangular frame 409.

[0061] Local working principle: When installing the linear displacement sensor 5, the linear displacement sensor 5 is passed through the inside of the rectangular frame 409, and then the first positioning screw 410 is tightened to fix the linear displacement sensor 5.

[0062] In this embodiment, the limiting component includes a first permanent magnet 411 and a second permanent magnet 412. The first permanent magnet 411 is fixed to the end of the carrier plate 8, and the second permanent magnet 412 is fixed to the side of the sleeve 404. The first permanent magnet 411 and the second permanent magnet 412 are magnetically attracted to each other.

[0063] Let the attraction force between the first permanent magnet 411 and the second permanent magnet 412 be Fmagnetic, and the tilt angle of the inclined slot 402 be θ. Then the impact force threshold for triggering separation, Fthreshold, is equal to Fmagnetic. sinθ, recommended θ=45 The magnet F uses neodymium iron boron permanent magnets with a magnetic force range of 5-20N (adjustable by adjusting the magnet size or spacing). The initial tension length of the tension spring 407 must ensure that the preload of the tension spring 407, F_tension, equals F_magnet when the sleeve 404 is in its initial position. cosθ ensures that the 404 sleeve remains stable and does not slip under normal operating conditions.

[0064] Local working principle: In the initial state, the first permanent magnet 411 and the second permanent magnet 412 are magnetically attracted to each other. When the instantaneous impact force is greater than the attraction between the magnets, the sleeve 404 separates from the carrier plate 8.

[0065] In this embodiment, the connecting mechanism 6 includes a lower trapezoidal block 601, an upper trapezoidal block 602, a vertical plate 603, an oblong groove 604, and a second positioning screw 605. The lower trapezoidal block 601 is fixed to the front end of the push rod on the linear displacement sensor 5. The vertical plate 603 is fixed to the object being measured. The upper trapezoidal block 602 is slidably arranged on the outer side of the vertical plate 603. The lower trapezoidal block 601, the upper trapezoidal block 602, and the oblique groove 402 have the same inclination angle. The oblong groove 604 is vertically opened on the side of the vertical plate 603. The second positioning screw 605 is threaded on the side of the upper trapezoidal block 602 and passes through the oblong groove 604.

[0066] The tilt angle θ of the lower trapezoidal block 601, the upper trapezoidal block 602, and the inclined groove 402 is 45°. To balance impact sensitivity and normal connection stability, the roughness Ra of the trapezoidal block's inclined surface is ≤1.6μm, and the angle tolerance is ±0.5°. During installation, the tooling fixture ensures that the gap between the upper and lower trapezoidal block inclined surfaces is ≤0.1mm.

[0067] Local working principle: During connection, the inclined surfaces of the lower trapezoidal block 601 and the upper trapezoidal block 602 are in contact with each other. When the object being measured drives the push rod to slide in a straight line, the lower trapezoidal block 601 and the upper trapezoidal block 602 are in a stable connection state and will not separate from each other. However, when the instantaneous impact force is too large, the inclined surfaces of the lower trapezoidal block 601 and the upper trapezoidal block 602 slide together and can automatically release the locking state. When the linear displacement sensor 5 is reset, the object being measured will drive the upper trapezoidal block 602 to move to the initial position. During the upward tilting process, the lower trapezoidal block 601 at the end of the push rod of the linear displacement sensor 5 can automatically contact and reset with the bottom end of the upper trapezoidal block 602.

[0068] In this embodiment, the impact-resistant mechanism 9 includes a cylinder 901, a piston 902, a buffer spring 903, a connecting rod 904, a collar 905, an L-shaped rod 906, and a strip groove 907. The cylinder 901 is fixed to the bottom of the carrier plate 8. A one-way intake valve and a one-way exhaust valve are installed at the end of the cylinder 901. The piston 902 is slidably arranged inside the cylinder 901. A buffer spring 903 is provided between the piston 902 and the end of the cylinder 901. A connecting rod 904 is fixed to the outside of the piston 902. A collar 905 is fixed to the end of the connecting rod 904. An L-shaped rod 906 is vertically slidably arranged inside the collar 905. The top end of the L-shaped rod 906 is fixedly connected to the lower trapezoidal block 601. A strip groove 907 is provided on the carrier plate 8 for the L-shaped rod 906 to pass through and slide.

[0069] Cylinder block 901 has an inner diameter of Φ10-Φ20mm, piston 902 has a stroke of 10-30mm, and uses air as the buffer medium. During air buffering, the flow rate of the one-way intake valve meets the air replenishment requirements of piston 902 at its maximum speed. The buffer spring 903 is a cylindrical helical spring with an elastic coefficient k=50. 200N / mm, pre-compression 10-20mm, to ensure that the spring compression does not exceed 80% of the stroke under maximum impact force.

[0070] Local working principle: When the lower trapezoidal block 601 and the upper trapezoidal block 602 are connected, during the linear sliding of the push rod driven by the measured object, the piston 902 is controlled to slide inside the cylinder 901, generating a certain sliding resistance. In addition, during retraction, the buffer spring 903 also suppresses the sliding of the push rod caused by inertia, ensuring the accuracy of use. During reset, the buffer spring 903 can provide a reverse thrust to speed up the reset of the push rod.

[0071] In this embodiment, the dust removal mechanism 10 includes an air pipe 1001 and an air groove 1002. The air pipe 1001 is installed on a one-way exhaust valve at the end of the cylinder 901. An air groove 1002 is provided at the top of the carrier plate 8 corresponding to the end of the push rod. The top of the air pipe 1001 is connected to the inside of the air groove 1002.

[0072] The air groove 1002 is 2-5mm wide and 1-2mm deep, perpendicular to the moving direction of the push rod. The air nozzle diameter is Φ0.5-Φ1mm. When the piston 902 moves, the gas pressure discharged from the cylinder 901 is ≥0.1MPa and the airflow speed is ≥10m / s, ensuring that dust on the push rod surface is effectively blown away.

[0073] Local working principle: When the piston 902 slides inside the cylinder 901, during the retraction phase, the gas inside the cylinder 901 enters the gas groove 1002 through the gas pipe 1001 and then is discharged, compressing the gas at the end of the push rod to remove dust. When the push rod returns to its original position, the outside gas re-enters the cylinder 901 to replenish it.

[0074] In this embodiment, the reset mechanism 11 includes an electric telescopic rod 1101 and a push plate 1102. The electric telescopic rod 1101 is horizontally installed at the end of the protective frame 3, and the output end of the electric telescopic rod 1101 extends into the interior of the protective frame 3. The push plate 1102 is vertically installed at the output end of the electric telescopic rod 1101.

[0075] Local working principle: When it is necessary to control the linear displacement sensor 5 to reset, the electric telescopic rod 1101 is activated to apply a horizontal thrust to the sleeve 404. The slider 403 on the side of the sleeve 404 slides inside the inclined groove 402, and the sleeve 404 will tilt upward until the permanent magnet is attracted again, and then the electric telescopic rod 1101 is reset.

[0076] like Figures 1-8 As shown, this embodiment provides a retraction protection method applied to a displacement sensor, and the process is as follows:

[0077] Step 1: Before installation, adjust the shim mechanism 2 to raise both ends of the bottom of the mounting plate 1, adjust the push rod on the linear displacement sensor 5 to be coaxial with the object being measured, and then use bolts to fix the mounting plate 1 in place.

[0078] Step 2: In use, the linear displacement sensor 5 is set parallel to the top of the protective frame 3, and the push rod on the linear displacement sensor 5 is connected to the object being measured by the connecting mechanism 6. The object being measured drives the push rod to retract and move. During the sliding process, the anti-impact mechanism 9 is used to suppress the inertial impact of the push rod when it retracts, and the dust removal mechanism 10 is used to remove dust from the surface when the push rod retracts to avoid dust contamination and ensure the stable sliding of the push rod.

[0079] Step 3: When the instantaneous impact force applied by the object being tested to the linear displacement sensor 5 exceeds the set threshold, the hiding and avoidance mechanism 4 drives the linear displacement sensor 5 to tilt and move downward in a direction away from the object being tested, and disconnects it from the object being tested, hiding the linear displacement sensor 5 inside the protective frame 3 for protection.

[0080] Step 4: When the linear displacement sensor 5 is reused, the linear displacement sensor 5 is pushed obliquely upward using the reset mechanism 11, and the linear displacement sensor 5 is moved to the initial detection position. The push rod is then reconnected to the object being measured using the connecting mechanism 6.

[0081] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A retraction protection device, used in a displacement sensor, comprising a mounting plate (1), characterized in that: A protective frame (3) is fixed on the top of the mounting plate (1) along the length direction. The top of the protective frame (3) is open. A linear displacement sensor (5) is provided on the top of the protective frame (3) along the length direction. A hidden avoidance mechanism (4) for controlling the linear displacement sensor (5) to tilt and move downward is provided in the middle of the protective frame (3). The mounting plate (1) has a heightening mechanism (2) at both ends of the bottom for coaxial adjustment of the linear displacement sensor (5) and the object being measured. A connecting mechanism (6) is provided between the end of the push rod of the linear displacement sensor (5) and the object being measured. The protective frame (3) has an opening (7) at one end of the push rod near the linear displacement sensor (5). The bottom of the opening (7) is horizontally provided with a carrier plate (8) on one side near the inside of the protective frame (3). The bottom of the carrier plate (8) is provided with an anti-impact mechanism (9) to absorb the retraction inertia of the push rod. The top of the carrier plate (8) is provided with a dust removal mechanism (10) for cleaning the end of the push rod with compressed air. The top of the protective frame (3) away from the opening (7) is provided with a wire groove (301), and a reset mechanism (11) for pushing the linear displacement sensor (5) upward is provided below the wire groove (301). The concealed avoidance mechanism (4) includes a side plate (401), a sloping groove (402), a slider (403), a sleeve (404), a rectangular groove (405), a rectangular rod (406), a tension spring (407), a sliding rod (408), and a limiting component. The side plates (401) are symmetrically arranged on both sides of the bottom of the protective frame (3). The inner side of each side plate (401) is provided with a sloping groove (402). The inside of each sloping groove (402) is provided with a slider (403). A sleeve (404) is vertically fixed between two sets of sliders (403). A rectangular groove (405) is provided at the lower end of the sleeve (404). A rectangular rod (406) is vertically slidably arranged inside the rectangular groove (405). A tension spring (407) is fixed between the side of the rectangular rod (406 away from the opening (7) and the end of the protective frame (3). A sliding rod (408) is fixed between the two ends of the protective frame (3). The sliding rod (408) passes through the tension spring (407) and the rectangular rod (406), and the sliding rod (408) and the rectangular rod (406) are slidably connected. A linear displacement sensor (5) is fixed on the top of the sleeve (404). A limiting component is provided between the side of the sleeve (404) and the end of the carrier plate (8).

2. The retraction protection device according to claim 1, applied in a displacement sensor, characterized in that: The raising mechanism (2) includes a vertical groove (201), a pad (202), a screw (203), a threaded groove (204), and an adjusting block (205). The vertical groove (201) is opened at the bottom of the mounting plate (1) and is parallel to the width direction of the mounting plate (1). The pad (202) is vertically slidably arranged inside the vertical groove (201). The top of the vertical groove (201) is rotatably installed with a screw (203). The top of the pad (202) is provided with a threaded groove (204) that cooperates with the screw (203). The top of the screw (203) extends to the top of the mounting plate (1). The top of the screw (203) is installed with an adjusting block (205).

3. The retraction protection device according to claim 2, applied in a displacement sensor, characterized in that: A rectangular frame (409) is fixed to the top of the sleeve (404), and a linear displacement sensor (5) passes through the inside of the rectangular frame (409). A first positioning screw (410) is installed on the top of the rectangular frame (409).

4. The retraction protection device according to claim 3, applied in a displacement sensor, characterized in that: The limiting component includes a first permanent magnet (411) and a second permanent magnet (412). The first permanent magnet (411) is fixed to the end of the carrier plate (8), and the second permanent magnet (412) is fixed to the side of the sleeve (404). The first permanent magnet (411) and the second permanent magnet (412) are magnetically attracted to each other.

5. The retraction protection device according to claim 4, applied in a displacement sensor, characterized in that: The connecting mechanism (6) includes a lower trapezoidal block (601), an upper trapezoidal block (602), a vertical plate (603), a waist-shaped groove (604), and a second positioning screw (605). The lower trapezoidal block (601) is fixed to the front end of the push rod of the linear displacement sensor (5). The vertical plate (603) is fixed to the object being measured. The upper trapezoidal block (602) is slidably arranged on the outside of the vertical plate (603). The lower trapezoidal block (601), the upper trapezoidal block (602), and the inclined groove (402) have the same inclination angle. The waist-shaped groove (604) is vertically opened on the side of the vertical plate (603). The second positioning screw (605) is threaded on the side of the upper trapezoidal block (602). The second positioning screw (605) passes through the waist-shaped groove (604).

6. The retraction protection device according to claim 5, applied in a displacement sensor, characterized in that: The impact-resistant mechanism (9) includes a cylinder (901), a piston (902), a buffer spring (903), a connecting rod (904), a collar (905), an L-shaped rod (906), and a strip groove (907). The cylinder (901) is fixed to the bottom of the carrier plate (8). A one-way intake valve and a one-way exhaust valve are installed at the ends of the cylinder (901). A piston (902) is slidably arranged inside the cylinder (901). The piston (902) and the cylinder (904) are connected. A buffer spring (903) is provided between the ends of the piston (901). A connecting rod (904) is fixed on the outside of the piston (902). A collar (905) is fixed at the end of the connecting rod (904). An L-shaped rod (906) is vertically slidably arranged inside the collar (905). The top of the L-shaped rod (906) is fixedly connected to the lower trapezoidal block (601). A strip groove (907) is provided on the carrier plate (8) for the L-shaped rod (906) to pass through and slide.

7. The retraction protection device according to claim 6, applied in a displacement sensor, characterized in that: The dust removal mechanism (10) includes an air pipe (1001) and an air groove (1002). The air pipe (1001) is installed on a one-way exhaust valve at the end of the cylinder (901). An air groove (1002) is provided at the top of the carrier plate (8) corresponding to the end of the push rod. The top of the air pipe (1001) is connected to the inside of the air groove (1002).

8. The retraction protection device according to claim 1, applied in a displacement sensor, characterized in that: The reset mechanism (11) includes an electric telescopic rod (1101) and a push plate (1102). The electric telescopic rod (1101) is horizontally installed at the end of the protective frame (3). The output end of the electric telescopic rod (1101) extends into the interior of the protective frame (3). The output end of the electric telescopic rod (1101) is vertically installed with the push plate (1102).

9. A retraction protection method, the retraction protection device according to any one of claims 1-8, applied in a displacement sensor, characterized in that, Includes the following steps: Step 1: Before installation, adjust the shim mechanism (2), raise both ends of the bottom of the mounting plate (1), adjust the push rod on the linear displacement sensor (5) to be coaxial with the object being measured, and then use bolts to fix the mounting plate (1) in place. Step 2: When in use, the linear displacement sensor (5) is set parallel to the top of the protective frame (3), and the push rod on the linear displacement sensor (5) is connected to the object being measured by the connecting mechanism (6). The object being measured drives the push rod to retract and move. During the sliding process, the anti-impact mechanism (9) is used to suppress the inertial impact of the push rod when it retracts, and the dust removal mechanism (10) is used to remove dust from the surface when the push rod retracts to avoid dust pollution and ensure the stable sliding of the push rod. Step 3: When the instantaneous impact force applied by the test object to the linear displacement sensor (5) exceeds the set threshold, the hiding and avoidance mechanism (4) drives the linear displacement sensor (5) to tilt and move downward in the direction away from the test object, and disconnects from the test object, hiding the linear displacement sensor (5) inside the protective frame (3) for protection. Step 4: When the linear displacement sensor (5) is reused, the linear displacement sensor (5) is pushed obliquely upward using the reset mechanism (11), and the linear displacement sensor (5) is moved to the initial detection position. The push rod is then reconnected to the object being measured using the connecting mechanism (6).

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