A brake pad bump detection device

Abstract

The application relates to the technical field of laser detection, in particular to a brake pad convex point detection device; the device comprises a detection table and a detection box fixedly connected to the upper surface of the detection table; two tracks are fixedly connected to the upper surface of the detection table; the upper surface of one of the tracks is fixedly connected with a sliding rod through a supporting block; the upper surface of the other track is rotationally connected with a screw rod through a supporting block; the screw rod is driven by a lower motor; the device can realize synchronous detection of multiple brake pads by means of the rolling detection beads and the laser ranging assembly; compared with the traditional scanning mode in which the laser directly hits the surface of a workpiece, the device takes the physical contact of the detection beads as a trigger medium, the idle area cannot cause height misjudgment, the complex operation is reduced, the identification response is fast, the step disc drives the circumferential rolling of the detection beads, the detection coverage is large, multiple workpieces can be detected at one time, the overall detection efficiency is improved, the equipment manufacturing cost is reduced, and the convex point detection and identification precision is ensured.

Description

Technical Field

[0001] This invention relates to the field of laser detection technology, specifically a device for detecting protrusions on brake pads. Background Technology

[0002] Currently, brake pads are prone to developing protrusion defects on their surface after production. These protrusions directly affect the assembly accuracy and braking performance of the brake pads. Therefore, it is necessary to conduct protrusion defect detection and screening on brake pads. Most existing technologies feed individual brake pads into the testing equipment one by one for testing. Only after one pad is tested can the next pad be fed in for testing. This only allows for piece-by-piece testing of the workpiece, resulting in a long testing cycle and low overall testing efficiency. To improve testing efficiency, a laser direct scanning solution that can simultaneously test multiple workpieces has emerged in the industry. In this testing method, the laser is directly projected onto the surface of the workpiece. During the scanning process, the laser simultaneously scans the workpiece area of ​​the brake pad and the empty area without a workpiece. The empty area and the upper surface of the brake pad (the upper surface of the brake pad itself also has different height differences) have a significant height difference, which generates a large amount of interference data. The equipment needs to be equipped with complex computing algorithms to distinguish between valid signals and interference signals. This results in a large computational load, slow detection response, and a high risk of misjudgment and missed judgment. It is difficult to meet the actual production needs of batch multi-piece testing and rapid and accurate defect identification at the same time. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention proposes a brake pad protrusion detection device. This invention relies on a rolling detection bead in conjunction with a laser ranging component to achieve simultaneous detection of multiple brake pads. Unlike the traditional scanning method where the laser directly hits the workpiece surface, this device uses the physical contact of the detection bead as the trigger medium. Empty areas will not produce high misjudgments, reducing complex calculations and providing fast recognition response. The rotating stepped plate drives the detection bead to roll circumferentially, resulting in a large detection coverage area. Multiple workpieces can be detected at once, improving overall detection efficiency, reducing equipment manufacturing costs, and ensuring the accuracy of protrusion detection and recognition.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: A brake pad protrusion detection device of this invention includes a detection platform and a detection box fixedly attached to the upper surface of the detection platform; two tracks are fixedly attached to the upper surface of the detection platform; a sliding rod is fixedly attached to the upper surface of one track via a support block; a screw is rotatably connected to the upper surface of the other track via a support block; the screw is driven by a lower motor; the screw is threadedly connected to a base plate, and the base plate is slidably connected to the sliding rod; a placement plate is connected to the upper surface of the base plate; a hydraulic cylinder is fixedly attached to the top of the detection box; an upper motor is fixedly attached to the output end of the hydraulic cylinder; a stepped plate is fixedly attached to the output end of the upper motor; a detection hole is fixedly attached to the lower surface of the stepped plate facing upwards; the lower end of the detection hole has an inwardly arc-shaped opening; a detection bead is movably connected inside the detection hole; the diameter of the detection bead is adapted to the inner diameter of the detection hole, and the center of the detection bead is higher than the lower end of the detection hole; a laser ranging component is fixedly attached to the bottom of the detection hole.

[0005] Preferably, the base plate is provided with a transverse groove running through it vertically; the transverse groove is slidably connected to a transverse block fixedly connected to the placement plate; the transverse block is fixedly connected to the output end of the electric push rod; and the outer wall of the electric push rod is fixedly connected to the base plate.

[0006] Preferably, the placement plate has an isosceles trapezoidal groove communicating with the upper surface horizontally inside; an isosceles trapezoidal block is slidably connected in the isosceles trapezoidal groove; the middle part of the placement plate is fixedly connected to the housing of the central motor; the bottom plate has a clearance groove corresponding to the central motor running vertically through the center; the two output ends of the central motor are fixedly connected to screw rods; the two screw rods have opposite spiral directions; the screw rods are threadedly connected to the corresponding isosceles trapezoidal blocks; the upper surface of the placement plate has a U-shaped groove running horizontally through the left and right; the inner walls of the left and right sides of the U-shaped groove are movably connected to pressure strips; the lower surface of the pressure strips is connected to the corresponding isosceles trapezoidal blocks through pressure blocks.

[0007] Preferably, the lower surface of the pressure strip is provided with a pressure groove with an isosceles trapezoidal cross section; a pressure block with the same cross section is slidably connected in the pressure groove; the pressure block is fixedly connected to the corresponding isosceles trapezoidal block; the front and rear inner walls of the U-shaped groove are provided with corrugated surfaces; the crests and troughs of the two corrugated surfaces correspond to each other.

[0008] Preferably, during the process of the two pressure strips approaching each other, the two pressure strips move in opposite directions; the thickness of the pressure strips and the depth of the U-shaped groove are less than the thickness of the detection piece; the side of the two pressure strips approaching each other is roughened.

[0009] Preferably, a detection spring is provided inside the detection hole; the detection spring is sleeved on the outside of the laser ranging component; the upper end of the detection spring abuts against the bottom of the detection hole, and the lower end abuts against the detection bead.

[0010] Preferably, the lower end of the detection spring is fixed to the pad; the lower surface of the pad is adapted to and in rolling contact with the surface of the detection bead.

[0011] Preferably, a limiting sleeve is fixed to the upper surface of the pad; the limiting sleeve is located inside the detection spring; lubricant is filled between the outer side of the limiting sleeve and the inner wall of the detection hole; and overflow holes are provided through the arc-shaped outer wall of the pad from top to bottom.

[0012] Preferably, the stepped plate is composed of an upper plate and a lower plate; the upper half of the detection hole is located in the upper plate and the lower half is located in the lower plate; the upper surface of the lower plate is provided with a vent groove that passes through the detection hole; the lower plate is connected to the upper plate by hexagonal bolts.

[0013] The beneficial effects of this invention are as follows: 1. This invention relies on a rolling detection bead in conjunction with a laser ranging component to achieve simultaneous detection of multiple brake pads. Unlike the traditional scanning method where the laser directly hits the workpiece surface, this device uses the physical contact of the detection bead as the trigger medium. Empty areas will not produce high misjudgments, reducing complex calculations and providing fast recognition response. The rotating stepped disk drives the detection bead to roll circumferentially, resulting in a large detection coverage area. Multiple workpieces can be detected at once, improving overall detection efficiency, reducing equipment manufacturing costs, and ensuring the accuracy of protrusion detection and recognition.

[0014] 2. This invention uses an electric push rod to drive the placement plate to slide left and right relative to the base plate. This movement, combined with the forward and backward movement of the base plate and the rotational scanning motion of the stepped disc, expands the actual scanning coverage area of ​​the upper surface of the brake pad, eliminates blind spots, and allows more of the brake pad surface to be detected by the detection beads, further improving the completeness and accuracy of protrusion detection.

[0015] 3. This invention uses a reverse-threaded screw to drive an isosceles trapezoidal block and a pressure block to clamp the pressure strips in opposite directions. The U-shaped groove corrugated surface guides the pressure strips, causing the two pressure strips to swing back and forth in opposite directions while clamping. The corrugated surface also reduces the gap between multiple brake pads in the U-shaped groove, allowing multiple brake pads to be clamped on the placement plate. This makes the brake pads more stable during the testing process and avoids workpiece displacement and shaking that could cause testing failure. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the stepped plate and the placement plate in this invention; Figure 3 This is a cross-sectional view of the placement plate in this invention; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5This is a perspective view of the pressure bar and screw rod in this invention; Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 This is a perspective view of the lower plate in this invention; Figure 8 yes Figure 7 Enlarged view of point C in the middle; Figure 9 This is a cross-sectional view of the detection hole in this invention.

[0018] In the diagram: 1. Inspection platform; 2. Inspection box; 21. Hydraulic cylinder; 22. Upper motor; 3. Track; 31. Support block; 32. Slide rod; 33. Screw; 34. Lower motor; 35. Base plate; 351. Horizontal groove; 36. Horizontal block; 37. Electric push rod; 38. Clearance groove; 4. Placement plate; 41. Isosceles trapezoidal groove; 42. Isosceles trapezoidal block; 43. Middle motor; 44. Screw; 45. U-shaped groove; 5. Stepped plate; 51. Inspection hole; 52. Inspection bead; 53. Laser ranging component; 54. Inspection spring; 55. Pad; 551. Overflow hole; 56. Limit sleeve; 57. Upper plate; 58. Lower plate; 581. Socket head bolt; 59. Ventilation groove; 6. Pressure strip; 61. Pressure block; 62. Pressure groove. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] like Figures 1 to 9 As shown, the present invention includes the following embodiments: Example 1: A brake pad protrusion detection device includes a detection platform 1 and a detection box 2 fixedly attached to the upper surface of the detection platform 1; two tracks 3 are fixedly attached to the upper surface of the detection platform 1; one track 3 has a slide rod 32 fixedly attached to its upper surface via a support block 31; the other track 3 has a screw 33 rotatably connected to its upper surface via a support block 31; the screw 33 is driven by a lower motor 34; the screw 33 is threadedly connected to a base plate 35, and the base plate 35 is slidably connected to the slide rod 32; a placement plate 4 is connected to the upper surface of the base plate 35; the detection... A hydraulic cylinder 21 is fixedly connected to the top of the measuring box 2; an upper motor 22 is fixedly connected to the output end of the hydraulic cylinder 21; a stepped plate 5 is fixedly connected to the output end of the upper motor 22; a detection hole 51 is fixedly connected to the lower surface of the stepped plate 5 with its lower surface facing upward; the lower end of the detection hole 51 has an inwardly curved opening; a detection bead 52 is movably connected inside the detection hole 51; the diameter of the detection bead 52 is adapted to the inner diameter of the detection hole 51, and lubricating fluid flows along the gap between the two; the center of the detection bead 52 is higher than the lower end of the detection hole 51; a laser ranging component 53 is fixedly connected to the bottom of the detection hole 51.

[0021] After production, brake pads are prone to developing raised bumps on their upper surface. These bumps directly affect subsequent assembly and braking performance, necessitating inspection and screening of the brake pads' upper surface. Initially, the placement plate 4 is positioned above the inspection table 1 outside the inspection box 2. The operator places multiple brake pads to be inspected onto the placement plate 4, completing the workpiece loading. Subsequently, the lower motor 34 is started, driving the screw 33 to rotate. The screw 33 forms a threaded transmission with the base plate 35. Driven by the screw 33, the base plate 35 simultaneously slides along the slide bar 32 and the two tracks 3, moving the placement plate 4 and the brake pads placed on it. Multiple brake pads are moved as a whole into the testing box 2, positioning them directly below the stepped disc 5. Then, the hydraulic cylinder 21 extends downwards, driving the upper motor 22 and the stepped disc 5 to move downwards. The stepped disc 5 moves the testing beads 52 inside the testing holes 51 downwards synchronously until the lowest point of the testing beads 52 is flush with the upper surface of the brake pads. Multiple sets of testing holes 51 are arranged radially along the stepped disc 5, covering the corresponding multiple brake pads to be tested. Next, the upper motor 22 is started to rotate, driving the stepped disc 5 to rotate continuously. The stepped disc 5 causes the testing beads 52 inside each testing hole 51 to perform a circular rolling scan around the center.

[0022] When the detection bead 52 rolls and contacts a protrusion on the surface of the brake pad, the protrusion pushes the detection bead 52 upward, causing it to move upward along the inner cavity of the detection hole 51. The detection bead 52 is non-transparent, and the laser ranging component 53 at the bottom of the hole continuously collects the distance value from itself to the upper surface of the detection bead 52 in real time. After the detection bead 52 moves upward, the distance parameter detected by the laser ranging component 53 changes, and the system can identify the presence of a protrusion defect. Because the lower end of the detection hole 51 has an inwardly curved constricted structure, it forms a limiting constraint on the detection bead 52. When the detection bead 52 rolls to an empty area without a brake pad, it will not exit the detection hole 51. 1. The internal components fall downwards, and the detection bead 52 maintains a fixed lower limit position. It will only move upwards when it contacts the protrusion of the brake pad, and will not misjudge the empty area as a change in workpiece height. The system records the position information corresponding to the protrusion and completes the synchronous scanning and detection of multiple brake pads. The computer, together with the camera component inside the detection box 2, records the position of the defective products. After all the detection is completed, the hydraulic cylinder 21 is controlled to drive the stepped plate 5 to lift and reset, and then the lower motor 34 is controlled to drive the screw 33 to rotate in the opposite direction, driving the base plate 35 and the placement plate 4 to move out of the detection box 2. The operator can then remove the brake pads that have been inspected and pick out the defective products with protrusion defects.

[0023] This invention utilizes a rolling detection bead 52 in conjunction with a laser ranging component 53 to achieve simultaneous detection of multiple brake pads. Unlike traditional scanning methods where the laser directly hits the workpiece surface, this device uses the physical contact of the detection bead 52 as the triggering medium. Empty areas and other locations below the height of the brake pad detection surface will not produce height misjudgments, reducing complex calculations and improving recognition response speed. The rotating stepped disk 5 drives the detection bead 52 to roll circumferentially, resulting in a large detection coverage area. Multiple workpieces can be detected at once, improving overall detection efficiency, reducing equipment manufacturing costs, and ensuring the accuracy of protrusion detection and recognition.

[0024] Example 2: The base plate 35 is provided with a horizontal groove 351 running through it vertically; the horizontal groove 351 is slidably connected to a horizontal block 36 which is fixedly connected to the placement plate 4; the horizontal block 36 is fixedly connected to the output end of the electric push rod 37; the outer wall of the electric push rod 37 is fixedly connected to the base plate 35.

[0025] When the placement plate 4 has moved into the detection box 2 along with the base plate 35, the stepped plate 5 moves into place, and the upper motor 22 drives the stepped plate 5 to perform a circumferential rotation scan. At the same time, the electric push rod 37 is controlled to reciprocate. The electric push rod 37 drives the horizontal block 36 to slide back and forth along the horizontal groove 351 of the base plate 35. The horizontal block 36 further drives the placement plate 4 and the brake pads on the plate to move back and forth synchronously. At the same time, the lower motor 34 can also work in conjunction, driving the screw 33 to drive the base plate 35 to move back and forth along the track 3. The placement plate 4 then... It can achieve dynamic position adjustment in the combined front-back and left-right directions; the brake pads follow the placement plate 4 to perform planar reciprocating motion in the front-back and left-right directions, forming a motion superposition with the detection beads 52 in the rotating stepped disk 5; in this embodiment, the placement plate 4 is driven by the electric push rod 37 to slide left and right relative to the base plate 35, which, together with the front-back movement of the base plate 35, superimposes with the rotational scanning motion of the stepped disk 5, expanding the actual scanning coverage area of ​​the upper surface of the brake pads, eliminating detection blind spots, and allowing more of the brake pad surface to be detected by the detection beads 52, further improving the integrity and accuracy of protrusion detection.

[0026] Example 3: The placement plate 4 has an isosceles trapezoidal groove 41 that is horizontally connected to the upper surface; an isosceles trapezoidal block 42 is slidably connected in the isosceles trapezoidal groove 41; the housing of the central motor 43 is fixedly connected to the middle of the placement plate 4; the bottom plate 35 has a clearance groove 38 corresponding to the central motor 43 that runs vertically through the center; the output ends of the central motor 43 are fixedly connected to screw rods 44; the two screw rods 44 have opposite spiral directions; the screw rods 44 are threadedly connected to the corresponding isosceles trapezoidal blocks 42; the upper surface of the placement plate 4 has a U-shaped groove 45 that runs horizontally through the left and right sides; the inner walls of the left and right sides of the U-shaped groove 45 are movably connected to pressure strips 6; the lower surface of the pressure strips 6 is connected to the corresponding isosceles trapezoidal blocks 42 through pressure blocks 61.

[0027] In this embodiment, the lower surface of the pressure strip 6 is provided with a pressure groove 62 with an isosceles trapezoidal cross section; a pressure block 61 with the same cross section is slidably connected in the pressure groove 62; the pressure block 61 is fixedly connected to the corresponding isosceles trapezoidal block 42; the front and rear inner walls of the U-shaped groove 45 are provided with corrugated surfaces; the peaks and troughs of the two corrugated surfaces correspond to each other.

[0028] In this embodiment, as the two pressure strips 6 approach each other, the two pressure strips 6 move in opposite directions; the thickness of the pressure strips 6 and the depth of the U-shaped groove 45 are less than the thickness of the detection element (i.e., the brake pad); the two pressure strips 6 are rough-set on the side that approaches each other.

[0029] Before sending the brake pads into the testing chamber 2 for testing, the operator places multiple brake pads to be tested inside the U-shaped groove 45 of the placement plate 4, with the bottom of the brake pads resting on the bottom of the U-shaped groove 45 and the top of the brake pads protruding above the U-shaped groove 45, to prevent the pressure strip 6 from completely covering the upper surface of the brake pads and to prevent interference with the subsequent scanning of the testing beads 52; an avoidance groove 38 is provided on the base plate 35 to provide the intermediate motor 43 with room for movement and to prevent collision interference between the base plate 35 and the intermediate motor 43 during relative movement between them; after placement, the intermediate motor 43 is started, and the output shafts at both ends of the intermediate motor 43 drive two screw rods 44 with opposite spiral directions to rotate synchronously; the two screw rods 44 form a threaded transmission with the isosceles trapezoidal blocks 42 on both sides. The movement drives two sets of isosceles trapezoidal blocks 42 to slide closer to each other along the isosceles trapezoidal groove 41 inside the placement plate 4; the isosceles trapezoidal groove 41 matches the cross section of the isosceles trapezoidal block 42, playing a guiding and anti-detachment limiting role; the isosceles trapezoidal block 42 drives the pressure block 61 to move synchronously, the pressure block 61 is stuck inside the isosceles trapezoidal pressure groove 62 on the lower surface of the pressure strip 6, the pressure block 61 can slide relative to each other in the pressure groove 62, and transmit the left and right thrust of the isosceles trapezoidal block 42 to the pressure strip 6, driving the left and right pressure strips 6 to move towards each other; during the approach process, the pressure strip 6 continuously contacts the corrugated surfaces corresponding to the front and rear sides of the U-shaped groove 45, and under the guiding action of the corrugated surface crests and troughs, the two pressure strips 6 produce back-and-forth swings in opposite directions.

[0030] The inner surface of the pressure strip 6 is roughened (protrusions can be added). As the pressure strip 6 swings, it continuously clamps multiple brake pads inside the U-shaped groove 45. During the convergence of the multiple brake pads towards the center of the placement plate 4, they are squeezed and shaken by the two corrugated surfaces, and with the squeezing and pushing action of the pressure strip 6, the gap between the multiple brake pads in the U-shaped groove 45 is reduced, causing the multiple brake pads to converge towards the center. Finally, all brake pads are positioned and clamped between the two pressure strips 6, completing the batch positioning of multiple brake pads. After positioning and clamping are completed, the lower motor 34 is then activated. The placement plate 4 is moved into the subsequent inspection process of the inspection box 2. In this embodiment, the isosceles trapezoidal block 42 and the pressure block 61 are driven by the reverse threaded screw 44 to clamp the pressure strips 6 in opposite directions. With the corrugated surface of the U-shaped groove 45 guiding the pressure strips 6, the two pressure strips 6 swing back and forth in opposite directions while being clamped. With the setting of the corrugated surface, the gap between multiple brake pads in the U-shaped groove 45 is reduced, so that multiple brake pads can be clamped on the placement plate 4, making the brake pads more stable during the inspection process and avoiding the workpiece displacement and shaking during the inspection process, which would cause the inspection to fail.

[0031] Example 4: The detection hole 51 is provided with a detection spring 54; the detection spring 54 is sleeved on the outside of the laser ranging component 53; the upper end of the detection spring 54 abuts against the bottom of the detection hole 51, and the lower end abuts against the detection bead 52.

[0032] In this embodiment, the lower end of the detection spring 54 is fixedly connected to the pad 55; the lower surface of the pad 55 is adapted to and in rolling contact with the surface of the detection bead 52.

[0033] When the stepped plate 5 drives the detection ball 52 to roll and scan, when the detection ball 52 encounters the brake pad protrusion, the protrusion pushes the detection ball 52 upward. The upward movement of the detection ball 52 compresses the pad block 55, which further compresses the detection spring 54, causing the spring 54 to undergo elastic deformation. After the detection ball 52 rolls past the protrusion, the upward pushing force of the protrusion on the detection ball 52 disappears, and the compressed detection spring 54 releases its elastic force to push the pad block 55 downward. The pad block 55 then acts downward on the detection ball 52, quickly pushing the detection ball 52 back to its initial lower limit position. If the downward reset of the detection ball 52 is slow, it may cause misjudgment of the protrusion, thus improving efficiency. Detection accuracy: The lower surface of the pad 55 and the spherical surface of the detection bead 52 are compatible with each other and have rolling contact. During the rolling rotation of the detection bead 52, the pad 55 will not hinder the free rolling of the detection bead 52. The pad 55 separates the detection spring 54 from the spherical surface of the detection bead 52, avoiding direct contact between the detection spring 54 and the spherical surface of the detection bead 52. At the same time, the pad 55 provides a flat upper reflective reference surface. The laser of the laser ranging component 53 is directed to the flat upper surface of the pad 55 to complete the distance acquisition, avoiding the problems of laser diffuse reflection and unstable reflected light path caused by the arc-shaped spherical surface of the detection bead 52, and ensuring stable signal output of the laser ranging component 53.

[0034] In this embodiment, the detection spring 54 provides a downward reset force to the detection bead 52, allowing the detection bead 52 to quickly reset after passing the protrusion, ensuring timely response to the next protrusion contact detection and guaranteeing dynamic detection accuracy. A pad 55 adapted to the spherical surface of the detection bead 52 is added to achieve smooth transmission of the spring force without interfering with the rolling of the detection bead 52. At the same time, the pad 55 provides a flat laser reflective surface, eliminating laser diffuse reflection interference caused by the curved surface of the detection bead 52 and improving the stability and reliability of the laser ranging data.

[0035] Example 5: The upper surface of the pad 55 is fixedly connected to the limiting sleeve 56; the limiting sleeve 56 is located inside the detection spring 54; the space between the outer side of the limiting sleeve 56 and the inner wall of the detection hole 51 is filled with lubricant; the arc-shaped outer wall of the pad 55 is provided with overflow holes 551 running through it from top to bottom.

[0036] The limiting sleeve 56 is arranged inside the detection spring 54 to radially limit the detection spring 54 and prevent radial misalignment or jamming during operation. The gap between the outer wall of the limiting sleeve 56 and the inner wall of the detection hole 51 is filled with lubricating medium. There is an air pressure communication channel between the inside and outside of the detection hole 51. Under atmospheric pressure, the lubricating fluid inside the gap can seep out through the overflow hole 551 on the outer wall of the pad 55 and flow to the rolling contact position between the pad 55 and the detection bead 52. As the detection bead 52 continues to roll and the pad 55 and the detection bead 52 continue to move relative to each other, the seeping lubricating medium continuously lubricates the rolling contact position between the two. The rolling friction resistance between the pad 55 and the detection bead 52 is reduced, wear is decreased, and bead jamming is avoided. The limiting sleeve 56 also provides peripheral protection for the laser ranging component 53, reducing the direct splashing of lubricant onto the laser ranging component 53. In this embodiment, the limiting sleeve 56 radially limits the detection spring 54 to prevent misalignment, while storing the lubricating medium. With the help of the overflow hole 551, the lubricating medium is continuously supplied downward to the pad 55 and the detection bead 52 under air pressure, achieving continuous lubrication, reducing friction and wear, preventing the detection bead 52 from rolling and jamming, ensuring that the up-and-down movement and rolling action of the detection bead 52 are flexible and reliable, and extending the service life of the components.

[0037] Example 6: The stepped plate 5 is composed of an upper plate 57 and a lower plate 58; the upper half of the detection hole 51 is located in the upper plate 57 and the lower half is located in the lower plate 58; the upper surface of the lower plate 58 is provided with a vent groove 59 that passes through the detection hole 51; the lower plate 58 is connected to the upper plate 57 by an internal hex bolt 581.

[0038] The stepped plate 5 adopts a split upper plate 57 and lower plate 58 structure, which are detachably fastened together by hexagon socket bolts 581. The detection hole 51 is separated into the upper plate 57 and lower plate 58. The vent groove 59 is opened on the upper end face of the lower plate 58 and connects to the inner cavity of the detection hole 51. The vent groove 59 ensures that the internal space of the detection hole 51 is interconnected with the external atmosphere, balances the air pressure inside the detection hole 51, and prevents the formation of a closed negative pressure inside the detection hole 51 when the detection bead 52 moves up and down, which would cause the detection bead 52 to move slowly or get stuck. When maintenance and repair are required, the lower plate 58 can be separated from the upper plate 57 by removing the hexagon socket bolts 581, which allows for easy disassembly and assembly of the lower half of the detection hole 51, the detection bead 52, the pad 55, and the limit sleeve 56, and can be used to replace, replenish, or replace the detection bead 52. The lubricating medium can be changed, and the detection spring 54 can be inspected and replaced. The laser ranging component 53 can be installed at the bottom of the detection hole 51 in the upper plate 57 using a threaded detachable method. After disassembling the stepped plate 5, it is also convenient to disassemble and maintain the laser ranging component 53. In this embodiment, the stepped plate 5 adopts a bolted split assembly structure of the upper plate 57 and the lower plate 58, which is convenient for disassembly and assembly, and facilitates the replacement of vulnerable parts such as the detection bead 52 and the detection spring 54, as well as the addition and maintenance of the lubricating medium. The lower plate 58 is provided with a vent groove 59 to realize the air permeability and pressure relief of the inner cavity of the detection hole 51, eliminate the interference of the air pressure in the sealed cavity on the lifting and lowering movement of the detection bead 52, ensure the sensitive movement of the detection bead 52, and facilitate the later maintenance of the equipment. It should be noted that the inner wall of the detection hole 51 can be connected to a liquid hole, which is connected to a liquid pump for automatic lubrication replenishment.

[0039] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, "fixed connection" refers to a fixed connection. In the description of the present invention, "sliding connection" refers to a connection where the two parts can only slide and cannot be separated. Specifically, the groove can be set to be concave and the block can be set to be convex, and the specific design can be adjusted according to the actual situation. "Sliding fit" refers to a connection where the two parts can slide and separate. In the description of the present invention, "rotational connection" refers to a connection where the two parts can only rotate and cannot produce axial displacement. Specifically, an annular groove can be set on the inner wall of the hole, and a ring that is rotatably connected to the groove can be fixed to the outer wall of the shaft.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brake pad protrusion detection device, comprising a detection platform and a detection box fixedly attached to the upper surface of the detection platform; characterized in that: Two tracks are fixed to the upper surface of the testing platform; a sliding rod is fixed to the upper surface of one track via a support block; a screw is rotatably connected to the upper surface of the other track via a support block; the screw is driven by a lower motor; the screw is threadedly connected to a base plate, and the base plate is slidably connected to the sliding rod; a placement plate is connected to the upper surface of the base plate; a hydraulic cylinder is fixed to the top of the testing box; an upper motor is fixed to the output end of the hydraulic cylinder; a stepped plate is fixed to the output end of the upper motor; a testing hole is fixed to the lower surface of the stepped plate facing upwards; the lower end of the testing hole has an inwardly curved opening; a testing bead is movably connected inside the testing hole; the diameter of the testing bead is adapted to the inner diameter of the testing hole; the center of the testing bead is higher than the lower end of the testing hole; a laser ranging component is fixed to the bottom of the testing hole.

2. The brake pad protrusion detection device according to claim 1, characterized in that: The base plate has a horizontal groove running through it from top to bottom; the horizontal groove is slidably connected to a horizontal block that is fixed to the placement plate; the horizontal block is fixed to the output end of the electric push rod; the outer wall of the electric push rod is fixed to the base plate.

3. The brake pad protrusion detection device according to claim 1, characterized in that: The placement plate has an isosceles trapezoidal groove communicating with the upper surface horizontally inside; an isosceles trapezoidal block is slidably connected in the isosceles trapezoidal groove; the middle part of the placement plate is fixedly connected to the housing of the central motor; the bottom plate has a clearance groove corresponding to the central motor running vertically through the center; the two output ends of the central motor are fixedly connected to screw rods; the two screw rods have opposite helical directions; the screw rods are threadedly connected to the corresponding isosceles trapezoidal blocks; the upper surface of the placement plate has U-shaped grooves running horizontally through the left and right; pressure strips are movably connected to the left and right inner walls of the U-shaped grooves; the lower surface of the pressure strips is connected to the corresponding isosceles trapezoidal blocks through pressure blocks.

4. The brake pad protrusion detection device according to claim 3, characterized in that: The lower surface of the pressure strip is provided with a pressure groove with an isosceles trapezoidal cross section; a pressure block with the same cross section is slidably connected in the pressure groove; the pressure block is fixedly connected to the corresponding isosceles trapezoidal block; the front and rear inner walls of the U-shaped groove are provided with corrugated surfaces; the peaks and troughs of the two corrugated surfaces correspond to each other.

5. The brake pad protrusion detection device according to claim 4, characterized in that: As the two pressure strips approach each other, they move in opposite directions; the thickness of the pressure strips and the depth of the U-shaped groove are less than the thickness of the detection piece; the side of the two pressure strips that are close to each other is roughened.

6. The brake pad protrusion detection device according to claim 1, characterized in that: A detection spring is provided inside the detection hole; the detection spring is sleeved on the outside of the laser ranging component; the upper end of the detection spring abuts against the bottom of the detection hole, and the lower end abuts against the detection bead.

7. The brake pad protrusion detection device according to claim 6, characterized in that: The detection spring is fixed to the pad at its lower end; the lower surface of the pad is adapted to and in rolling contact with the surface of the detection bead.

8. The brake pad protrusion detection device according to claim 7, characterized in that: The upper surface of the pad is fixedly connected to the limiting sleeve; the limiting sleeve is located inside the detection spring; the space between the outer side of the limiting sleeve and the inner wall of the detection hole is filled with lubricant; the arc-shaped outer wall of the pad is provided with overflow holes running through it from top to bottom.

9. The brake pad protrusion detection device according to claim 1, characterized in that: The stepped plate is composed of an upper plate and a lower plate; the upper half of the detection hole is located in the upper plate, and the lower half is located in the lower plate; the upper surface of the lower plate is provided with a vent groove that passes through the detection hole; the lower plate is connected to the upper plate by hexagonal bolts.

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