Brake disc measuring instrument

Abstract

The brake disc measuring instrument comprises a shell arranged on a sleeve in a sleeving mode, a measuring rod assembly is arranged in the sleeve, and a displayer is arranged on the shell. A battery mounting hole is further formed in the shell, a battery is mounted in the battery mounting hole, a circuit board is arranged on the battery, and the battery is electrically connected with the circuit board through an electrode plate. The brake disc thickness measuring device has the advantages of being simple and convenient to measure, high in measuring efficiency, high in measuring precision and convenient to read measuring results, the brake disc measured through the brake disc thickness measuring device can ensure braking safety, a gasket does not need to be cushioned in the brake disc thickness measuring process, the measuring time of the brake disc is greatly shortened, measuring errors are avoided, and the brake disc thickness measuring device is suitable for large-scale popularization and application. The problems of low measurement efficiency, large measurement error and poor measurement effect due to the fact that a gasket needs to be arranged when a caliper is adopted to measure the brake disc in the prior art are solved. And the problems that the measurement result is inconvenient to read and the use limitation is large due to the fact that the display of the traditional caliper is fixed and cannot rotate are also solved.

Description

Technical Field

[0001] The invention relates to the field of measuring instruments, and in particular to a brake disc measuring instrument. Background Art

[0002] The surface of a new brake disc is generally completely flat. As the brake system is used for a long time, the friction between the brake disc and the brake pad will cause steps to appear on the edge of the brake disc surface. The brake disc usually requires that the wear on both sides should not exceed two millimeters, and the wear on one side should not exceed one millimeter. Three common coated paper business cards stacked together are about this thickness. The traditional method of measuring brake discs is to cut the business card according to the curvature of the brake disc, and then place the business card on the edge of the brake disc surface to compare whether the height of the step exceeds the thickness of the three business cards. If it exceeds, the brake disc needs to be replaced. This measurement method is very unreliable, resulting in inaccurate measurement.

[0003] In order to improve the measurement accuracy, the staff later used ordinary calipers to measure the thickness of the brake pads. Since the ordinary caliper's rod does not have two raised structures, the ordinary caliper generally needs to be padded with a shim to measure the thickness of the brake pads, resulting in the thickness of the shim being subtracted from the final measurement result. This measurement method has the problems of large measurement errors and measurement troubles, resulting in the brake discs detected by this measurement method being difficult to ensure the safety of braking. In addition, the display of the electronic caliper currently on the market is generally fixedly installed with the ruler, and it cannot be rotated, resulting in the user being unable to read the data displayed on the display from multiple different angles and being unable to see the display data, resulting in the user being unable to measure objects from multiple different angles or multiple different directions. Moreover, the electronic caliper currently on the market needs to be manually pushed to reset after measurement, resulting in poor operational flexibility, large limitations in use, and inconvenience in use. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a brake disc measuring instrument.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: the brake disc measuring instrument comprises a sleeve, a shell is arranged outside the sleeve, a measuring rod assembly is arranged inside the sleeve, and a display is arranged on the shell.

[0006] Preferably, the housing is further provided with a battery mounting hole, a battery is mounted in the battery mounting hole, and a circuit board is disposed above the battery.

[0007] By adopting the above technical solution, the battery is electrically connected to the circuit board through the electrode sheet, and the battery supplies power to the circuit board.

[0008] Preferably, a sleeve mounting hole is provided on one end of the housing, the sleeve passes through the sleeve mounting hole, a flexible circuit board is sleeved on the outer circumference of the sleeve, a moving grid plate is vertically passed through the sleeve, a fixed stop pin is radially perpendicular to the sleeve, the fixed stop pin protrudes from the outer circumference of the sleeve, a movable stop pin is inserted into the sleeve mounting hole, the movable stop pin is vertically arranged with the sleeve, and the fixed stop pin and the movable stop pin are located on the same radial section of the sleeve; the housing rotates relative to the sleeve, and the fixed stop pin limits the movable stop pin to realize the sleeve limiting the rotation of the housing. The composition structure and working principle of the circuit board and the flexible circuit board are already common knowledge and will not be explained in detail here.

[0009] Preferably, the measuring rod assembly includes a measuring rod that movably passes through the sleeve, a guide sleeve is provided on the measuring rod, one end of the guide sleeve is butt-jointed and installed with one end of the sleeve through a locking sleeve, and the other end of the guide sleeve is connected and installed with a probe seat; a strong magnet is provided on one end of the probe seat, the strong magnet protrudes from the side of the probe seat, and a shaft sleeve is provided on the other end of the probe seat, one end of the measuring rod movably passes through the shaft sleeve and extends out of the shaft sleeve, a bent probe is provided on the side of the probe seat facing away from the sleeve, one end of the bent probe is connected and installed with the measuring rod, the other end of the bent probe is bent and extended and arranged opposite to the strong magnet, and the strong magnet provides magnetic force to the bent probe to attract the bent probe.

[0010] By adopting the above-mentioned technical scheme, when the user or the measurer needs to measure the thickness of the brake disc, he only needs to push the measuring rod assembly to extend the measuring rod out of the measuring head seat. The extended measuring rod drives the curved measuring head to move outward and separate from the strong magnet, and the separated curved measuring head is clamped on the brake disc with the strong magnet inside and outside. Since the strong magnet protrudes outward from the side of the measuring head seat, the curved measuring head and the strong magnet avoid the step of the brake disc when clamping the brake disc, so that the distance between the curved measuring head and the strong magnet is the actual thickness of the brake disc. The measurement result is the direct result of the thickness of the brake disc. It does not need to be padded with a shim, and the measurement result does not need to subtract the thickness of the shim, so that the measurement result is more accurate, which greatly reduces the measurement error. It has the advantages of simple measurement, high measurement efficiency, high measurement accuracy and good measurement effect, so that it can effectively replace the traditional method of using a caliper and requiring a shim to test the thickness of the brake disc.

[0011] Preferably, a fixed grid seat is installed on the measuring rod in the sleeve, a fixed grid is provided on the fixed grid seat, a moving grid plate is arranged opposite to the fixed grid, and the fixed grid moves in the sleeve with the measuring rod; one end of the flexible circuit board is connected and installed with the moving grid plate, and the other end of the flexible circuit board is connected and installed with the circuit board; a spring is arranged in the sleeve, one end of the spring is connected and installed with the measuring rod, and the other end of the spring is connected and installed with the sleeve; a measuring rod extension rod is provided at the end of the measuring rod away from the probe seat, the measuring rod and the measuring rod extension rod are coaxially arranged, one end of the measuring rod extension rod is connected and installed with the measuring rod through a stud, and the other end of the measuring rod extension rod is threadedly connected with a handle. Both the moving grid plate and the fixed grid are capacitive grid sensors, but this is not limited to this. The capacitive grid sensor is a capacitive digital sensor based on the variable area working principle that can measure large displacements. Its composition structure and working principle are common knowledge and will not be explained in detail here. It can use a capacitive grid sensor with model TM-003, but this is not limited to this. The moving grid plate is connected to the circuit board for signal through the flexible circuit board.

[0012] By adopting the above technical solution, the fixed grid seat prevents the measuring rod assembly from rotating when it moves in the sleeve. When the measurer or user pushes the handle in the direction of the housing, the handle pushes the curved probe to move away from the housing through the measuring rod extension rod and the measuring rod and separates from the strong magnet. The separated curved probe and the strong magnet can clamp the brake disc. The measurer or user can adjust the distance between the curved probe and the strong magnet by pushing the handle to make it suitable for measuring brake discs of different thicknesses. When the curved probe and the strong magnet clamp the two sides of the brake disc, the fixed grid can be dislocated with the moving grid plate as the measuring rod moves. The moving grid plate automatically senses the distance of the dislocation with the fixed grid. Since one end of the flexible circuit board is connected and installed with the moving grid plate, the moving grid plate automatically processes the distance signal it senses and feeds it back to the circuit board through the flexible circuit board. When the measurer or user releases the handle and rotates the housing, the display can rotate with the rotation of the housing to face the measurer or user, so that the measurer or user can quickly read the results or data of the brake disc thickness measurement displayed on the display. It directly displays the test results of the brake disc thickness on the display, so that it can display the test results intelligently and has the advantage of high test accuracy. When the user or measurer removes the brake disc measuring instrument from the brake disc, under the elastic force of the spring, the spring pulls the measuring rod and then pulls the curved probe to move in the direction of the strong magnet and contact each other, so that the curved probe can automatically reset after the test.

[0013] Preferably, the housing is rotated on the sleeve at an angle of 0°-270°.

[0014] Furthermore, the housing can be rotated on the sleeve at angles including but not limited to 0°, 30°, 45°, 60°, 90°, 120°, 150°, 180°, 210°, 240° and 270°... according to the needs of the measurer.

[0015] By adopting the above technical solution, since the outer shell can rotate on the sleeve, when the sleeve is stationary, the outer shell can be rotated at any angle within 270° according to the needs of the measurer, so as to facilitate the display on the outer shell to face the measurer. It not only facilitates the measurer to read the test results or test data of the brake disc thickness displayed on the display in real time from multiple different angles, but also enables the measuring rod assembly to test the thickness of the brake disc from multiple different angles, thereby solving the problem that the current caliper is limited to testing only from the angle or side where the scale numbers can be seen, resulting in poor operational flexibility and great usage limitations.

[0016] Preferably, the display includes a backlight panel arranged on the circuit board, a liquid crystal panel is arranged on the backlight panel, a panel is arranged on the liquid crystal panel, keys and a key base are arranged on the panel, the keys are installed on the panel through the key base, and a dust and water-proof lens is also arranged on the panel.

[0017] Preferably, two sleeve sealing rings are sleeved on the sleeve.

[0018] By adopting the above technical solution, the design of the sleeve sealing ring strengthens the sealing performance of the joint between the shell and the sleeve.

[0019] Preferably, a battery cover is provided under the battery, a battery cover sealing ring is sleeved on the battery cover, and the battery cover fixes the battery in the battery installation hole.

[0020] By adopting the above technical solution, the battery cover sealing ring strengthens the sealing performance of the battery cover and the battery installation, making it have better dustproof and waterproof functions.

[0021] Preferably, the measuring rod and the measuring rod extension rod are jointly covered with a silicone protective cover, a silicone front cover is provided on the outer side of one end of the silicone protective cover, the silicone front cover is installed in the sleeve, and a silicone rear cover is provided in the other end of the silicone protective cover.

[0022] By adopting the above technical solution, the design of the silicone front cover strengthens the sealing of the joint between the sleeve and the silicone protective cover, making it more waterproof and dustproof.

[0023] Preferably, the outer shell of the silicone protective sleeve is provided with a limiting sleeve, which is threadedly connected to the sleeve.

[0024] By adopting the above technical solution, the limiting sleeve can limit the silicone protective sleeve to prevent the silicone protective sleeve from arching when it is under pressure.

[0025] Furthermore, the housing, panel, key bottom plate, liquid crystal panel, backlight plate, circuit board, lens, electrode sheet, key, battery, battery cover sealing ring and battery cover and other components constitute the housing assembly.

[0026] It should be noted that the battery mounting hole and the sleeve mounting hole are both functional descriptions of the mounting holes. The fixed limit pin and the movable limit pin are both functional descriptions of the limit pin. The sleeve seal and the battery cover seal are both functional descriptions of the seal. The probe seat, the key bottom plate and the probe extension rod are functional descriptions of the test head mounting seat, the bottom plate and the extension rod respectively.

[0027] Compared with the prior art, the beneficial effects of the present invention are: 1. The structure of the outer shell is designed, and a battery is installed in the battery installation hole of the outer shell. A circuit board is arranged on the battery. The battery is electrically connected to the circuit board through an electrode sheet, so that the battery can supply power to the circuit board.

[0028] 2. A sleeve mounting hole is provided on one end of the shell, the sleeve passes through the sleeve mounting hole, two sleeve sealing rings are sleeved on the sleeve, and the sleeve sealing ring strengthens the sealing of the joint between the shell and the sleeve; a fixed limit pin is provided radially and perpendicularly to the sleeve, the fixed limit pin protrudes from the outer circumferential surface of the sleeve, a movable limit pin is inserted into the sleeve mounting hole, the movable limit pin and the sleeve are vertically arranged, the fixed limit pin and the movable limit pin are located on the same radial cross section of the sleeve, the shell rotates relative to the sleeve, the fixed limit pin limits the movable limit pin to realize the rotation limit of the sleeve to the shell, so that the shell can be rotated on the sleeve by 0°-270°, so as to facilitate the display on the shell to face the measurer after rotation. It is convenient for the measurer to directly read the measurement results or measurement data of the brake disc thickness, and it is possible to read the measurement results or measurement data displayed on the display from multiple different angles and to directly test the brake disc thickness from multiple different angles or multiple different directions, so that the thickness of the brake disc can be measured at any position of the wheel hub, so as to solve the problem that the display of the electronic caliper on the market is generally fixedly installed with the ruler, and it cannot be rotated, resulting in the user being unable to read the data displayed on the display from multiple different angles and unable to test the brake disc thickness from multiple different angles or multiple different directions, resulting in poor operating flexibility, great usage limitations and inconvenience in use.

[0029] 3. A curved probe is arranged on the side of the probe seat facing away from the sleeve, one end of the curved probe is connected and installed with a measuring rod, the other end of the curved probe is bent and extended and arranged opposite to a strong magnet, the strong magnet provides magnetic force to the curved probe to attract the curved probe, and at the same time, a measuring rod extension rod is arranged at the end of the measuring rod away from the probe seat, and a handle is threadedly connected to one end of the measuring rod extension rod; when the measurer pushes the handle toward the housing, the handle pushes the curved probe to move away from the housing through the measuring rod extension rod and the measuring rod in turn and separates from the strong magnet, and the separated curved probe is separated from the strong magnet. The strong magnet can be stuck on the brake disc. Since the strong magnet is protruding from the side of the probe seat, the curved probe and the strong magnet avoid the step of the brake disc when clamping the brake disc. At this time, the distance between the curved probe and the strong magnet is the real thickness of the brake disc. It does not need to put on a shim or subtract the thickness of the shim according to the measurement result, so it has the advantages of high measurement efficiency, high measurement accuracy and convenient measurement. It effectively solves the problem that traditional calipers need to put on shims to measure brake discs, which leads to low measurement efficiency, large measurement error and poor measurement effect.

[0030] 4. A fixed grid seat is installed on the measuring rod, a fixed grid is arranged on the fixed grid seat, a moving grid plate is vertically penetrated through the sleeve, a flexible circuit board is sleeved on the outer circumference of the sleeve, one end of the flexible circuit board is connected and installed with the moving grid plate, and the other end of the flexible circuit board is connected and installed with the circuit board; when the curved probe and the strong magnet clamp the two sides of the brake disc, the fixed grid will be misaligned with the moving grid plate through the fixed grid seat as the measuring rod moves, the moving grid plate senses the distance of the misalignment with the fixed grid and feeds back the sensing signal to the circuit board through the flexible circuit board, and the test results or test data of the brake disc thickness are directly displayed on the display, which can realize the intelligent display of the test results to ensure high accuracy and convenient reading of the test data.

[0031] 5. The structure of the sleeve is designed in which a spring is arranged in the sleeve, one end of the spring is connected to the measuring rod, and the other end of the spring is connected to the sleeve. When the brake disc measuring instrument that has completed the measurement is removed from the brake disc, the measuring rod drives the curved measuring head to move in the direction of the strong magnet under the pull of the elastic force of the spring and contact each other, so that the curved measuring head can be automatically reset after the test, thereby solving the trouble that the electronic caliper on the market needs to be manually pushed to reset after measurement.

[0032] 6. A silicone front cover is provided on the outer side of one end of the silicone protective cover, and the silicone front cover strengthens the sealing of the joint between the sleeve and the silicone protective cover. At the same time, a silicone rear cover is provided inside the other end of the silicone protective cover, and the silicone rear cover strengthens the sealing of the joint between the silicone protective cover and the handle. The design of the silicone front cover and the silicone rear cover makes the silicone protective cover have good sealing effect to meet certain waterproof and dustproof requirements; in addition, a limiting cover is provided on the outer shell of the silicone protective cover, and the limiting cover can limit the silicone protective cover to prevent the silicone protective cover from arching when it is under pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] For ease of explanation, the present invention is described in detail with reference to the following preferred embodiments and the accompanying drawings.

[0034] Figure 1 It is a front view of the brake disc measuring instrument of the present invention.

[0035] Figure 2 The present invention is an exploded perspective view of the brake disc measuring instrument with the battery removed from the housing.

[0036] Figure 3 The present invention is an exploded perspective view of the housing assembly of the brake disc measuring instrument.

[0037] Figure 4 The figure is a perspective view of the exploded structure of the brake disc measuring instrument of the present invention.

[0038] Figure 5 It is a cross-sectional structural diagram of the brake disc measuring instrument of the present invention.

[0039] Figure 6 It is a schematic diagram of the brake disc measuring instrument of the present invention rotating 270°.

[0040] Figure 7 The figure is a cross-sectional schematic diagram of the connection between the flexible circuit board and the circuit board of the brake disc measuring instrument of the present invention.

[0041] Figure 8 The present invention is an exploded stereoscopic diagram of a sleeve, a housing, a circuit board, a sleeve sealing ring, a flexible circuit board, a silicone front sleeve, a limit sleeve, a measuring rod extension rod, a silicone rear sleeve and a handle of the brake disc measuring instrument.

[0042] Fig. 9 The present invention is an exploded perspective view of the measuring rod assembly, the sleeve and the flexible circuit board of the brake disc measuring instrument.

[0043] Fig.10 It is a schematic diagram of the housing assembly of the brake disc measuring instrument of the present invention rotating within 270°. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] In this embodiment, refer to Figures 1 to 10 As shown, the brake disc measuring instrument of the present invention comprises a sleeve 1 , a shell 2 is disposed outside the sleeve 1 , a measuring rod assembly 3 is disposed inside the sleeve 1 , and a display 4 is disposed on the shell 2 .

[0047] In one embodiment, a battery installation hole 5 is provided on the housing 2, a battery 6 is installed in the battery installation hole 5, a circuit board 7 is provided on the battery 6, the battery 6 is electrically connected to the circuit board 7 through an electrode sheet 8, and the battery 6 supplies power to the circuit board 7.

[0048] In one of the embodiments, a sleeve mounting hole 9 is provided on one end of the outer shell 2, the sleeve 1 passes through the sleeve mounting hole 9, a flexible circuit board 38 is sleeved on the outer circumference of the sleeve 1, a moving grid plate 21 is vertically passed through the sleeve 1, a fixed limit pin 11 is radially perpendicular to the sleeve 1, the fixed limit pin 11 protrudes from the outer circumferential surface of the sleeve 1, a movable limit pin 12 is inserted into the sleeve mounting hole 9, the movable limit pin 12 is vertically arranged with the sleeve 1, and the fixed limit pin 11 and the movable limit pin 12 are located on the same radial section of the sleeve 1; the outer shell 2 rotates relative to the sleeve 1, and the fixed limit pin 11 limits the movable limit pin 12 to realize the sleeve 1 limiting the rotation of the outer shell 2.

[0049] In one embodiment, the measuring rod assembly 3 includes a measuring rod 15 that movably passes through the sleeve 1, and a guide sleeve 13 is sleeved on the measuring rod 15. One end of the guide sleeve 13 is docked and installed with one end of the sleeve 1 through a locking sleeve 131, and the other end of the guide sleeve 13 is connected and installed with a probe seat 14; a strong magnet 16 is provided on one end of the probe seat 14, and the strong magnet 16 protrudes from the side of the probe seat 14, and a shaft sleeve 17 is provided on the other end of the probe seat 14, one end of the measuring rod 15 movably passes through the shaft sleeve 17 and extends out of the shaft sleeve 17, and a bent probe 18 is provided on the side of the probe seat 14 facing away from the sleeve 1, one end of the bent probe 18 is connected and installed with the measuring rod 15, and the other end of the bent probe 18 is bent and extended and arranged opposite to the strong magnet 16, and the strong magnet 16 provides magnetic force to the bent probe 18 to attract the bent probe 18.

[0050] In one of the embodiments, a fixed grid seat 19 is installed on the measuring rod 15 in the sleeve 1, and a fixed grid 20 is provided on the fixed grid seat 19, a moving grid plate 21 is arranged opposite to the fixed grid 20, and the fixed grid 20 is telescopically movable in the sleeve 1 with the measuring rod 15, one end of the wound flexible circuit board 38 is connected and installed with the moving grid plate 21, and the other end of the flexible circuit board 38 is connected and installed with the circuit board 7; a spring 22 is provided in the sleeve 1, one end of the spring 22 is connected and installed with the measuring rod 15, and the other end of the spring 22 is connected and installed with the sleeve 1; a measuring rod extension rod 23 is provided at one end of the measuring rod 15 away from the probe seat 14, the measuring rod 15 and the measuring rod extension rod 23 are coaxially arranged, one end of the measuring rod extension rod 23 is connected and installed with the measuring rod 15 through a stud 24, and the other end of the measuring rod extension rod 23 is threadedly connected with a handle 25.

[0051] In one embodiment, the housing 2 is rotated on the sleeve 1 to an angle of 0°-270°.

[0052] In one embodiment, the display 4 includes a backlight panel 26 arranged on the circuit board 7, a liquid crystal panel 27 is arranged on the backlight panel 26, a panel 28 is arranged on the liquid crystal panel 27, buttons 29 and a button base plate 30 are respectively arranged on the panel 28, the button 29 is installed on the panel 28 through the button base plate 30, and a dust and water-proof lens 31 is also arranged on the panel 28.

[0053] In one embodiment, two sleeve sealing rings 10 are sleeved on the sleeve 1 .

[0054] In one embodiment, a battery cover 32 is provided below the battery 6 , a battery cover sealing ring 33 is sleeved on the battery cover 32 , and the battery cover 32 fixes the battery 6 in the battery installation hole 5 .

[0055] In one embodiment, the measuring rod 15 and the measuring rod extension rod 23 are jointly covered with a silicone protective cover 34, a silicone front cover 35 is provided on the outer side of one end of the silicone protective cover 34, the silicone front cover 35 is installed in the sleeve 1, and a silicone rear cover 36 is provided in the other end of the silicone protective cover 34.

[0056] In one embodiment, a limiting sleeve 37 is disposed on the outer shell of the silicone protective sleeve 34 , and the limiting sleeve 37 is threadedly connected to the sleeve 1 .

[0057] In one embodiment, the movable grid plate 21 and the fixed grid plate 20 are both capacitive grid sensors, but the invention is not limited thereto.

[0058] In another embodiment, the present invention further provides a testing method for a brake disc measuring instrument: a strong magnet 16 is provided on one end of a probe seat 14, a sleeve 17 is provided through the other end of the probe seat 14, a measuring rod 15 movably passes through the sleeve 17 and extends out of the sleeve 17, a bent probe 18 is provided on the side of the probe seat 14 facing away from the sleeve 1, one end of the bent probe 18 is connected and installed with the measuring rod 15, and the other end of the bent probe 18 is bent and extended and arranged opposite to the strong magnet 16, and the strong magnet 16 provides magnetic force to the bent probe 18 to tightly attract the bent probe 18. At the same time, a measuring rod extension rod 23 is provided at one end of the measuring rod 15 away from the measuring head seat 14, the measuring rod 15 and the measuring rod extension rod 23 are coaxially arranged, one end of the measuring rod extension rod 23 is connected and installed with the measuring rod 15 through a stud 24, and the other end of the measuring rod extension rod 23 is threadedly connected with a handle 25. When the measurer or user pushes the handle 25 in the direction of the housing 2, the handle 25 pushes the curved measuring head 18 to move away from the housing 2 through the measuring rod extension rod 23 and the measuring rod 15, and separates from the strong magnet 16, and the separated curved measuring head 18 and the strong magnet 16 are placed on the brake disc and clamp the brake disc. Since the strong magnet 16 protrudes from the side of the measuring head seat 14, the separated curved measuring head 18 and the strong magnet 16 can avoid the step of the brake disc when clamping the brake disc, and the distance between the curved measuring head 18 and the strong magnet 16 clamping the brake disc is the real thickness of the brake disc, and the measurement result is the direct result of the thickness of the brake disc.

[0059] The housing 2 is provided with a battery installation hole 5 , in which a battery 6 is installed, and a circuit board 7 is arranged on the battery 6 . The battery 6 is electrically connected to the circuit board 7 through an electrode sheet 8 , and the battery 6 supplies power to the circuit board 7 . A fixed grid seat 19 is installed on the measuring rod 15, a fixed grid 20 is provided on the fixed grid seat 19, a moving grid plate 21 is vertically penetrated through the sleeve 1, a flexible circuit board 38 is sleeved on the outer circumference of the sleeve 1, one end of the flexible circuit board 38 is connected and installed with the moving grid plate 21, and the other end of the flexible circuit board 38 is connected and installed with the circuit board 7; when the separated curved probe 18 and the strong magnet 16 clamp the two sides of the brake disc, the fixed grid 20 will be misaligned with the moving grid plate 21 through the fixed grid seat 19 as the measuring rod 15 moves, and the moving grid plate 21 automatically senses the distance of its misalignment with the fixed grid 20, and automatically feeds back the sensed distance signal to the circuit board 7 through the flexible circuit board 38, and displays the test result of the brake disc thickness through the display 4, which not only realizes the intelligent display of the test result, but also has the advantage of high test accuracy.

[0060] The sleeve 2 is provided with a sleeve mounting hole 9 at one end thereof, the sleeve 1 passes through the sleeve mounting hole 9, a fixed stop pin 11 is provided radially and perpendicularly to the sleeve 1, the fixed stop pin 11 protrudes from the outer circumferential surface of the sleeve 1, a movable stop pin 12 is inserted into the sleeve mounting hole 9, the movable stop pin 12 is vertically arranged with the sleeve 1, the fixed stop pin 11 and the movable stop pin 12 are located on the same radial cross section of the sleeve 1, the housing 2 can rotate on the sleeve 1, the fixed stop pin 11 can limit the movable stop pin 12 to realize the rotation of the sleeve 1 on the housing 2, so that the housing 2 can rotate on the sleeve 1 by 0°-270°; when the measurer or user releases the handle 25 and rotates the housing 2 according to the needs of use, the above structural design can make the display 4 As the housing 2 rotates, it faces the measurer or user, so that the measurer or user can quickly read the measurement results or measurement data of the brake disc thickness from the display 4. It not only enables the measurer or user to read the measurement results or measurement data on the display 4 from multiple different angles, but also enables the thickness of the brake disc to be measured from multiple different angles or multiple different directions, so as to solve the problem that the display 4 in the traditional caliper structure is fixed and cannot be rotated, resulting in the measurer or user being unable to read the data displayed on the display 4 from multiple different angles and unable to test the thickness of the brake disc from multiple different angles or multiple different directions, resulting in poor operational flexibility, great usage limitations, inconvenience in use and inconvenience in reading measurement results.

[0061] A spring 22 is provided in the sleeve 1, one end of the spring 22 is connected to the measuring rod 15, and the other end of the spring 22 is connected to the sleeve 1. After the thickness test of the brake disc is completed, the measurer or user removes the brake disc measuring instrument from the brake disc. The spring 22 uses its elastic force to pull the measuring rod 15 and then pulls the curved measuring head 18 to move in the direction of the strong magnet 16 and contact each other, so that the curved measuring head 18 can automatically reset after the test, thereby solving the trouble of the electronic caliper on the market that needs to be manually pushed to reset after measurement.

[0062] The sleeve 1 is provided with two sleeve sealing rings 10, which strengthen the sealing performance of the joint between the housing 2 and the sleeve 1. At the same time, a silicone front sleeve 35 is provided on the outer side of one end of the silicone protective sleeve 34, and the silicone front sleeve 35 is installed in the sleeve 1. The design of the silicone front sleeve 35 strengthens the sealing performance of the joint between the sleeve 1 and the silicone protective sleeve 34. In addition, a silicone rear sleeve 36 is provided in the other end of the silicone protective sleeve 34. The design of the silicone rear sleeve 36 strengthens the sealing performance of the joint between the silicone protective sleeve 34 and the handle 25, so that it has excellent waterproof and dustproof effects. A limiting sleeve 37 is also provided on the outer cover of the silicone protective sleeve 34, and the limiting sleeve 37 is threadedly connected to the sleeve 1. The design of the limiting sleeve 37 limits the silicone protective sleeve 34 to prevent the silicone protective sleeve 34 from arching when it is under pressure.

[0063] Its overall structural design has the advantages of simple measurement, high measurement efficiency, high measurement accuracy and convenient reading of measurement results for brake discs. The brake disc measured by it can ensure the safety of braking, and there is no need to put shims in the measurement process of the brake disc thickness, so there is no need to subtract the thickness of the shims according to the final measurement result. It greatly shortens the measurement time of the brake disc and greatly reduces the measurement error. It effectively solves the problem of low measurement efficiency, large measurement error and poor measurement effect caused by the current measurement method on the market that uses calipers to measure brake discs and requires shims to be put.

[0064] The above embodiment is only an example of the present invention and is not intended to limit the implementation and scope of rights of the present invention. Any technical solution that is identical or equivalent to the content described in the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. Brake disc measuring instrument, characterized by: It comprises a sleeve, a shell is arranged outside the sleeve, a measuring rod assembly is arranged inside the sleeve, and a display is arranged on the shell; The housing is also provided with a battery installation hole, in which a battery is installed, and a circuit board is provided on the battery, and the battery is electrically connected to the circuit board through an electrode sheet; A sleeve mounting hole is provided on one end of the shell, the sleeve passes through the sleeve mounting hole, a flexible circuit board is sleeved on the outer circumference of the sleeve, a moving grid plate is vertically passed through the sleeve, a fixed limit pin is radially and perpendicularly to the sleeve, the fixed limit pin protrudes from the outer circumferential surface of the sleeve, a movable limit pin is inserted into the sleeve mounting hole, the movable limit pin is vertically arranged with the sleeve, and the fixed limit pin and the movable limit pin are located on the same radial cross section of the sleeve; the shell rotates relative to the sleeve, and the fixed limit pin limits the movable limit pin to realize the sleeve limiting the rotation of the shell; The measuring rod assembly includes a measuring rod that movably passes through the sleeve, a guide sleeve is sleeved on the measuring rod, one end of the guide sleeve is butt-jointed and installed with one end of the sleeve through a locking sleeve, and the other end of the guide sleeve is connected and installed with a probe seat; a strong magnet is provided on one end of the probe seat, the strong magnet protrudes from the side of the probe seat, and a shaft sleeve is provided on the other end of the probe seat, one end of the measuring rod movably passes through the shaft sleeve and extends out of the shaft sleeve, a bent probe is provided on the side of the probe seat facing away from the sleeve, one end of the bent probe is connected and installed with the measuring rod, the other end of the bent probe is bent and extended and arranged opposite to the strong magnet, and the strong magnet provides magnetic force for the bent probe to tightly absorb the bent probe ; A fixed grid seat is installed on the measuring rod in the sleeve, and a fixed grid is provided on the fixed grid seat, and a moving grid plate is arranged opposite to the fixed grid, and the fixed grid can be extended and retracted in the sleeve along with the measuring rod; one end of the wound flexible circuit board is connected and installed with the moving grid plate, and the other end of the flexible circuit board is connected and installed with the circuit board; a spring is provided in the sleeve, one end of the spring is connected and installed with the measuring rod, and the other end of the spring is connected and installed with the sleeve; a measuring rod extension rod is provided at one end of the measuring rod away from the probe seat, the measuring rod and the measuring rod extension rod are arranged coaxially, one end of the measuring rod extension rod is connected and installed with the measuring rod through a stud, and the other end of the measuring rod extension rod is threadedly connected with a handle.

2. The brake disc measuring instrument according to claim 1, characterized in that: The housing is rotated on the sleeve at an angle of 0°-270°.

3. The brake disc measuring instrument according to claim 1, characterized in that: The display comprises a backlight plate arranged on the circuit board, a liquid crystal plate arranged on the backlight plate, a panel arranged on the liquid crystal plate, keys and a key bottom plate arranged on the panel, the keys are mounted on the panel through the key bottom plate, and a dustproof and waterproof lens is arranged on the panel.

4. The brake disc measuring instrument according to claim 1, characterized in that: The sleeve is sleeved with two sleeve sealing rings.

5. The brake disc measuring instrument according to claim 1, characterized in that: A battery cover is arranged under the battery, a battery cover sealing ring is sleeved on the battery cover, and the battery cover fixes the battery in the battery installation hole.

6. The brake disc measuring instrument according to claim 1, characterized in that: The measuring rod and the measuring rod extension rod are jointly covered with a silicone protective cover, a silicone front cover is arranged on the outer side of one end of the silicone protective cover, the silicone front cover is installed in the sleeve, and a silicone rear cover is arranged in the other end of the silicone protective cover.

7. The brake disc measuring instrument according to claim 6, characterized in that: The outer shell of the silicone protective sleeve is provided with a limiting sleeve, and the limiting sleeve is threadedly connected to the sleeve.

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