Brake disc measuring instrument

Abstract

The brake disc measuring instrument comprises a housing sleeved on a sleeve, a measuring rod assembly is arranged in the sleeve, and a display is arranged on the housing. 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 simple and convenient measurement, high measurement efficiency, high measurement precision and convenient measurement result reading, the brake disc measured by the brake disc thickness measuring device can ensure the brake safety, a gasket does not need to be cushioned in the process of measuring the thickness of the brake disc, the measurement time of the brake disc is shortened, measurement 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 utility model relates to the field of measuring instruments, in particular to a brake disc measuring instrument. Background Art

[0002] The surface of a new brake disc is generally completely flat. With the long-term use of the braking system, the friction between the brake disc and the brake pads will cause steps to appear on the surface edge of the brake disc. Generally, the total wear on both sides of the brake disc should not exceed two millimeters, and the wear on one side should not exceed one millimeter. Stacking three common copperplate business cards together is about this thickness. The traditional method for measuring the brake disc is to cut the business card according to the arc of the brake disc, and then place the business card at the surface edge position of the brake disc to compare whether the height of this step exceeds the thickness of these three business cards. When it exceeds, the brake disc needs to be replaced. This measurement method is very unreliable and has the deficiency of inaccurate measurement.

[0003] In order to improve the measurement accuracy, later, the staff used an ordinary caliper to measure the thickness of the brake pads. Since the caliper rod of the ordinary caliper does not have two convex structures, when using an ordinary caliper to measure, generally a gasket needs to be padded to measure the thickness of the brake pads. As a result, the thickness of the gasket needs to be subtracted from the finally measured result. This measurement method has the problems of large measurement error and troublesome measurement, making it difficult to ensure the braking safety of the brake disc detected by this measurement method. In addition, the display of the existing electronic calipers on the market is generally fixedly installed with the scale bar, and it cannot rotate, resulting in the user being unable to read the data displayed on the display from multiple different angles and unable to measure an object from multiple different angles or multiple different directions because the user cannot see the data on the display. Moreover, the existing electronic calipers on the market need to be manually pushed to reset after measurement, making them have the problems of poor operation flexibility, large use limitations, and inconvenience in use. Summary of the Invention

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

[0005] To solve the above technical problems, the utility model adopts the following technical solutions: This brake disc measuring instrument includes a sleeve, an outer shell is sleeved outside the sleeve, a measuring rod assembly is arranged inside the sleeve, and a display is arranged on the outer shell.

[0006] Preferably, a battery installation hole is further arranged on the outer shell, a battery is installed in the battery installation hole, and a circuit board is arranged on the battery.

[0007] By adopting the above technical solutions, 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 at one end of the outer 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 vertically penetrates the sleeve. A fixed limit pin is radially perpendicular to the sleeve and protrudes from the outer circumference surface of the sleeve. An active limit pin is inserted into the sleeve mounting hole, and the active limit pin is perpendicular to the sleeve. The fixed limit pin and the active limit pin are located on the same radial section of the sleeve. When the outer shell rotates relative to the sleeve, the fixed limit pin limits the active limit pin to limit the rotation of the sleeve relative to the outer shell. The composition structure and working principle of the circuit board and the flexible circuit board are common knowledge and will not be explained in detail here.

[0009] Preferably, the measuring rod assembly includes a measuring rod that movably penetrates 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. The other end of the guide sleeve is connected and installed with a measuring head seat. A strong magnet is provided at one end of the measuring head seat and protrudes from the side surface of the measuring head seat. A bushing penetrates through the other end of the measuring head seat. One end of the measuring rod movably passes through the bushing and extends out of the bushing. A bent measuring head is provided on the side of the measuring head seat facing away from the sleeve. One end of the bent measuring head is connected and installed with the measuring rod. The other end of the bent measuring head is bent and extended and is arranged opposite to the strong magnet. The strong magnet provides magnetic force to attract and hold the bent measuring head.

[0010] By adopting the above technical solution, when a user or a measurer needs to measure the thickness of a 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 bent measuring head to move outwards and separate from the strong magnet. The separated bent measuring head is clamped onto the brake disc in a way that the bent measuring head is inside and the strong magnet is outside. Since the strong magnet protrudes from the side surface of the measuring head seat, the bent measuring head and the strong magnet avoid the steps of the brake disc when clamping the brake disc, so that the distance between the bent measuring head and the strong magnet is the true thickness of the brake disc. The measurement result is the direct result of the brake disc thickness. Without the need to pad a gasket, the measurement result also does not need to subtract the thickness of the gasket, making the measurement result more accurate, greatly reducing the measurement error, and having the advantages of simple measurement, high measurement efficiency, high measurement accuracy, and good measurement effect, effectively replacing the traditional method of using a caliper and needing to pad a gasket to measure the thickness of the brake disc.

[0011] Preferably, a fixed grating base is installed on the measuring rod inside the sleeve. A fixed grating is provided on the fixed grating base. The moving grating plate is arranged opposite to the fixed grating. The fixed grating moves telescopically inside the sleeve along with the measuring rod. One end of the coiled flexible circuit board is connected and installed with the moving grating plate, and the other end of the flexible circuit board is connected and installed with the circuit board. A spring is arranged inside 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 head base. 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 double-headed stud, and a handle is threadedly connected to the other end of the measuring rod extension rod. Both the moving grating plate and the fixed grating are capacitive grating sensors, but not limited thereto. A capacitive grating sensor is a capacitance 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 grating sensor of model TM-003, but not limited thereto. The moving grating plate is signal-connected to the circuit board through the flexible circuit board.

[0012] By adopting the above technical solution, the fixed grating base prevents the measuring rod assembly from rotating inside the sleeve. When the measurer or user pushes the handle towards the housing, the handle pushes the bent probe head away from the housing through the measuring rod extension rod and the measuring rod, separating it from the strong magnet. The separated bent probe head and the strong magnet can hold the brake disc. The measurer or user can adjust the separation distance between the bent probe head and the strong magnet by pushing the handle to make it suitable for measuring brake discs of different thicknesses. When the bent probe head and the strong magnet hold both sides of the brake disc, the fixed grating can be displaced relative to the moving grating plate as the measuring rod moves. The moving grating plate automatically senses the displacement distance between it and the fixed grating. Since one end of the coiled flexible circuit board is connected and installed with the moving grating plate, the moving grating plate automatically processes the sensed distance signal 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 housing to face the measurer or user, facilitating the measurer or user to quickly read the measurement result or data of the brake disc thickness displayed on the display. It directly displays the test result of the brake disc thickness through the display, enabling intelligent display of the test result and having 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 bent probe head towards the strong magnet to make contact with each other, enabling the bent probe head to automatically reset after the test.

[0013] Preferably, the angle at which the housing rotates on the sleeve is 0° - 270°.

[0014] Further, the angles at which the outer shell can rotate on the sleeve according to the needs of the measurer include but are not limited to 0°, 30°, 45°, 60°, 90°, 120°, 150°, 180°, 210°, 240° and 270°...

[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 rotate at any angle within 270° according to the needs of the measurer, so as to conveniently orient the display on the outer shell towards the measurer. This 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, thus solving the problems of poor operation flexibility and large usage limitations of the current calipers, which are limited to testing from only one angle or one side where the scale numbers can be seen.

[0016] Preferably, the display includes a backlight board provided on the circuit board, a liquid crystal board provided on the backlight board, a panel provided on the liquid crystal board, buttons and a button base plate provided on the panel. The buttons are installed on the panel through the button base plate, and a lens for dust and water protection is also provided 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 at the joint of the outer shell and the sleeve.

[0019] Preferably, a battery cover is provided below 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 between the battery cover and the battery installation, making it have better dust and water protection functions.

[0021] Preferably, a silica gel protective sleeve is jointly sleeved on the measuring rod and the measuring rod extension rod. A silica gel front sleeve is provided on the outer side of one end of the silica gel protective sleeve, and the silica gel front sleeve is installed in the sleeve. A silica gel rear sleeve is provided inside the other end of the silica gel protective sleeve.

[0022] By adopting the above technical solution, the design of the silica gel front sleeve strengthens the sealing performance at the joint of the sleeve and the silica gel protective sleeve, making it have better waterproof and dustproof effects.

[0023] Preferably, a limit sleeve is sleeved outside the silica gel protective sleeve, and the limit sleeve is threadedly connected to the sleeve.

[0024] By adopting the above technical solution, the limiting sleeve can limit the silica gel protective cover to prevent the silica gel protective cover from arching when pressed.

[0025] Further, components such as the housing, the panel, the button base plate, the liquid crystal panel, the backlight plate, the circuit board, the lens, the electrode sheet, the button, the battery, the battery cover sealing ring and the battery cover constitute the housing assembly.

[0026] It should be noted that both the battery installation hole and the sleeve installation hole are functional descriptions of the installation hole. Both the fixed limiting pin and the movable limiting pin are functional descriptions of the limiting pin. Both the sleeve sealing ring and the battery cover sealing ring are functional descriptions of the sealing ring. The probe head seat, the button base plate and the probe rod extension rod are respectively functional descriptions of the test head mounting seat, the base plate and the extension rod.

[0027] Compared with the existing technology, the beneficial effects of the present utility model are as follows:

[0028] 1. By designing the structure of the housing, a battery is installed in the battery installation hole of the housing, a circuit board is arranged above the battery, and the battery is electrically connected to the circuit board through the electrode sheet, so that the battery can supply power to the circuit board.

[0029] 2. A sleeve installation hole is provided at one end of the housing, the sleeve passes through the sleeve installation hole, two sleeve sealing rings are sleeved on the sleeve, and the sleeve sealing rings strengthen the sealing performance at the joint of the housing and the sleeve; a fixed limiting pin is arranged radially perpendicular to the sleeve, the fixed limiting pin protrudes from the outer circumferential surface of the sleeve, a movable limiting pin is inserted into the sleeve installation hole, the movable limiting pin is perpendicular to the sleeve, the fixed limiting pin and the movable limiting pin are located on the same radial section of the sleeve, and when the housing rotates relative to the sleeve, the fixed limiting pin limits the movable limiting pin to realize the rotational limit of the sleeve to the housing, so that the housing can rotate 0° - 270° on the sleeve, so as to facilitate the display on the housing to face the measurer after rotation, and further facilitate the measurer to directly read the measurement result or measurement data of the brake disc thickness, and it can realize reading the measurement result or measurement data of the display from multiple different angles and realize directly testing the brake disc thickness from multiple different angles or multiple different directions, so as to realize measuring the thickness of the brake disc at any position of the wheel hub, so as to solve the problem that the display of the existing electronic caliper on the market is generally fixedly installed with the scale bar, and its inability to rotate results 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 operation flexibility, large use limitations and inconvenient use.

[0030] 3. It is provided with a bent probe on the side of the probe head seat facing away from the sleeve. One end of the bent probe is connected and installed with the probe rod. The other end of the bent probe is bent and extended and is arranged opposite to the strong magnet. The strong magnet provides magnetic force to attract and hold the bent probe tightly. At the same time, it is also provided with a probe rod extension rod at the end of the probe rod far from the probe head seat. One end of the probe rod extension rod is threadedly connected with a handle. When the measurer pushes the handle towards the direction of the housing, the handle sequentially drives the bent probe to move away from the housing through the probe rod extension rod and the probe rod and separates from the strong magnet. The separated bent probe and the strong magnet can be clamped on the brake disc. Since the strong magnet protrudes from the side of the probe head seat, the bent probe and the strong magnet avoid the steps of the brake disc when clamping the brake disc. At this time, the distance between the bent probe and the strong magnet is the true thickness of the brake disc. It realizes that there is no need to pad a gasket and no need to subtract the thickness of the gasket according to the measurement result, making it have the advantages of high measurement efficiency, high measurement accuracy and convenient measurement. It effectively solves the problems of low measurement efficiency, large measurement error and poor measurement effect of the traditional caliper that needs to pad a gasket to measure the brake disc.

[0031] 4. It installs a fixed grating seat on the probe rod. The fixed grating seat is provided with a fixed grating. A moving grating plate vertically penetrates the sleeve. A flexible circuit board is sleeved on the outer circumference of the sleeve. One end of the wound flexible circuit board is connected and installed with the moving grating plate, and the other end of the flexible circuit board is connected and installed with the circuit board. When the bent probe and the strong magnet clamp the two side surfaces of the brake disc, the fixed grating will be displaced from the moving grating plate as the probe rod moves through the fixed grating seat. The moving grating plate senses the distance of its displacement from the fixed grating and feeds back the sensing signal to the circuit board through the flexible circuit board. The test result or test data of the thickness of the brake disc is directly displayed through the display. It realizes intelligent display of the test result to ensure high accuracy and convenient reading of the test data.

[0032] 5. By designing the structure of the sleeve, it is provided with a spring inside the sleeve. One end of the spring is connected and installed with the probe rod, and the other end of the spring is connected and installed with the sleeve. After the brake disc measuring instrument that has completed the measurement is removed from the brake disc, the probe rod drives the bent probe to move towards the direction of the strong magnet and come into contact with each other under the pulling force of the spring, so that the bent probe can be automatically reset after the test, solving the trouble that the existing electronic caliper on the market needs to be manually pushed to reset after measurement.

[0033] 6. It is provided with a silica gel front sleeve on the outer side of one end of the silica gel protective cover. The silica gel front sleeve strengthens the sealing performance at the joint between the sleeve and the silica gel protective cover. At the same time, it is provided with a silica gel rear sleeve inside the other end of the silica gel protective cover. The silica gel rear sleeve strengthens the sealing performance at the joint between the silica gel protective cover and the handle. The designs of the silica gel front sleeve and the silica gel rear sleeve result in good sealing performance of the silica gel protective cover to meet certain requirements for waterproof and dustproof; in addition, a limiting sleeve is sleeved outside the silica gel protective cover, and the limiting sleeve can limit the silica gel protective cover to prevent the silica gel protective cover from arching when being pressed. Brief Description of the Drawings

[0034] For ease of explanation, the present utility model will be described in detail by the following preferred embodiments and the accompanying drawings.

[0035] Figure 1 It is the front view of the brake disc measuring instrument of the present utility model.

[0036] Figure 2 It is the exploded perspective view of the housing of the brake disc measuring instrument of the present utility model for removing the battery.

[0037] Figure 3 It is the exploded perspective view of the housing assembly of the brake disc measuring instrument of the present utility model.

[0038] Figure 4 It is the exploded perspective view of the brake disc measuring instrument of the present utility model.

[0039] Figure 5 It is the sectional structure diagram of the brake disc measuring instrument of the present utility model.

[0040] Figure 6 It is the schematic diagram of the 270° limit rotation of the brake disc measuring instrument of the present utility model.

[0041] Figure 7 It is the sectional connection schematic diagram of the flexible circuit board and the circuit board of the brake disc measuring instrument of the present utility model.

[0042] Figure 8 It is the exploded perspective view of the sleeve, housing, circuit board, sleeve sealing ring, flexible circuit board, silica gel front sleeve, limiting sleeve, measuring rod extension rod, silica gel rear sleeve and handle of the brake disc measuring instrument of the present utility model.

[0043] Figure 9 It is the exploded perspective view of the measuring rod assembly, sleeve and flexible circuit board of the brake disc measuring instrument of the present utility model.

[0044] Figure 10 It is the schematic diagram of the housing assembly of the brake disc measuring instrument of the present utility model rotating within 270°. Detailed Description of the Embodiment

[0045] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model 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 utility model more thorough and comprehensive.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0047] In this embodiment, with reference to Figures 1 to 10 As shown, the brake disc measuring instrument of the present utility model includes a sleeve 1, an outer shell 2 is sleeved outside the sleeve 1, a measuring rod assembly 3 is arranged inside the sleeve 1, and a display 4 is arranged on the outer shell 2.

[0048] In one embodiment, a battery installation hole 5 is arranged on the outer shell 2, a battery 6 is installed in the battery installation hole 5, a circuit board 7 is arranged on the battery 6, the battery 6 is electrically connected to the circuit board 7 through an electrode piece 8, and the battery 6 supplies power to the circuit board 7.

[0049] In one embodiment, a sleeve installation hole 9 is arranged at one end of the outer shell 2, the sleeve 1 passes through the sleeve installation hole 9, a flexible circuit board 38 is sleeved on the outer circumference of the sleeve 1, a moving grating plate 21 vertically penetrates the sleeve 1, a fixed limit pin 11 is radially perpendicular to the sleeve 1, the fixed limit pin 11 protrudes from the outer circumference surface of the sleeve 1, a movable limit pin 12 is inserted into the sleeve installation 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; when the outer shell 2 rotates relative to the sleeve 1, the fixed limit pin 11 limits the movable limit pin 12 to limit the rotation of the sleeve 1 relative to the outer shell 2.

[0050] In one embodiment, the measuring rod assembly 3 includes a measuring rod 15 that movably penetrates the sleeve 1, a guide sleeve 13 is sleeved on the measuring rod 15, one end of the guide sleeve 13 is butt - mounted 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 measuring head seat 14; a strong magnet 16 is arranged at one end of the measuring head seat 14, the strong magnet 16 protrudes from the side surface of the measuring head seat 14, a bushing 17 penetrates through the other end of the measuring head seat 14, one end of the measuring rod 15 movably penetrates the bushing 17 and extends out of the bushing 17, a bent measuring head 18 is arranged on the side of the measuring head seat 14 facing away from the sleeve 1, one end of the bent measuring head 18 is connected and installed with the measuring rod 15, and the other end of the bent measuring head 18 is bent and extended to be opposite to the strong magnet 16, and the strong magnet 16 provides magnetic force to attract and tighten the bent measuring head 18.

[0051] In one embodiment, a fixed grating base 19 is installed on a measuring rod 15 inside the sleeve 1. A fixed grating 20 is provided on the fixed grating base 19. A moving grating plate 21 is arranged opposite to the fixed grating 20. The fixed grating 20 moves telescopically inside the sleeve 1 along with the measuring rod 15. One end of the wound flexible printed circuit board 38 is connected and installed with the moving grating plate 21, and the other end of the flexible printed circuit board 38 is connected and installed with the circuit board 7. A spring 22 is arranged inside 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 head base 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 a handle 25 is threadedly connected to the other end of the measuring rod extension rod 23.

[0052] In one embodiment, the angle at which the housing 2 rotates on the sleeve 1 is 0° - 270°.

[0053] In one embodiment, the display 4 includes a backlight plate 26 provided on the circuit board 7. A liquid crystal panel 27 is provided on the backlight plate 26. A panel 28 is provided on the liquid crystal panel 27. Buttons 29 and a button base plate 30 are respectively provided on the panel 28. The buttons 29 are installed on the panel 28 through the button base plate 30. A lens 31 for dust and water protection is also provided on the panel 28.

[0054] In one embodiment, two sleeve sealing rings 10 are sleeved on the sleeve 1.

[0055] 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. The battery cover 32 fixes the battery 6 in the battery installation hole 5.

[0056] In one embodiment, a silica gel protective sleeve 34 is commonly sleeved on the measuring rod 15 and the measuring rod extension rod 23. A silica gel front sleeve 35 is provided on the outer side of one end of the silica gel protective sleeve 34. The silica gel front sleeve 35 is installed inside the sleeve 1. A silica gel rear sleeve 36 is provided inside the other end of the silica gel protective sleeve 34.

[0057] In one embodiment, a limit sleeve 37 is sleeved outside the silica gel protective sleeve 34, and the limit sleeve 37 is threadedly connected to the sleeve 1.

[0058] In one embodiment, both the moving grating plate 21 and the fixed grating 20 are capacitive grating sensors, but not limited thereto.

[0059] In another embodiment, the present utility model also provides a test method for a brake disc measuring instrument: a strong magnet 16 is provided at one end of the probe holder 14, a bushing 17 is provided through the other end of the probe holder 14, the measuring rod 15 movably passes through the bushing 17 and extends out of the bushing 17, a bent probe 18 is provided on the side of the probe holder 14 facing away from the sleeve 1, one end of the bent probe 18 is connected and installed to the measuring rod 15, and the other end of the bent probe 18 is bent and extended to be oppositely arranged with the strong magnet 16, and the strong magnet 16 provides magnetic force to attract and hold the bent probe 18. At the same time, a measuring rod extension rod 23 is provided at the end of the measuring rod 15 far from the probe holder 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 to the measuring rod 15 through a double-headed stud 24, and a handle 25 is threadedly connected to the other end of the measuring rod extension rod 23. When the measurer or user pushes the handle 25 towards the housing 2, the handle 25 pushes the bent probe 18 to move away from the housing 2 through the measuring rod extension rod 23 and the measuring rod 15 and will separate from the strong magnet 16, and the separated bent probe 18 and strong magnet 16 are placed on the brake disc and hold the brake disc. Since the strong magnet 16 protrudes from the side surface of the probe holder 14, when the separated bent probe 18 and strong magnet 16 hold the brake disc, the steps of the brake disc can be avoided, and the distance between the bent probe 18 and the strong magnet 16 when holding the brake disc is the true thickness of the brake disc, and the measurement result is the direct result of the brake disc thickness.

[0060] 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 piece 8, and the battery 6 supplies power to the circuit board 7. A fixed grating seat 19 is installed on the measuring rod 15, a fixed grating 20 is provided on the fixed grating seat 19, a moving grating 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 wound flexible circuit board 38 is connected and installed to the moving grating plate 21, and the other end of the flexible circuit board 38 is connected and installed to the circuit board 7; when the separated bent probe 18 and strong magnet 16 hold the two side surfaces of the brake disc, the fixed grating 20 will be misaligned with the moving grating plate 21 as the measuring rod 15 moves through the fixed grating seat 19, the moving grating plate 21 automatically senses the distance of its misalignment with the fixed grating 20, and automatically feeds back the sensed distance signal to the circuit board 7 through the flexible circuit board 38, and the test result of the brake disc thickness is displayed through the display 4. It not only realizes the intelligent display of the test result, but also has the advantages of high test accuracy.

[0061] One end of the outer shell 2 is provided with a sleeve mounting hole 9. The sleeve 1 passes through the sleeve mounting hole 9. A fixed limit pin 11 is radially perpendicular to the sleeve 1 and protrudes from the outer circumferential surface of the sleeve 1. A movable limit pin 12 is inserted into the sleeve mounting hole 9 and is perpendicular to the sleeve 1. 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 can rotate on the sleeve 1. The fixed limit pin 11 can limit the movable limit pin 12 to limit the rotation of the outer shell 2 by the sleeve 1, so that the outer shell 2 can rotate 0°-270° on the sleeve 1; when the measurer or user releases the handle 25 and rotates the outer shell 2 according to the needs of use, the above structural design enables the display 4 to face the measurer or user as the outer shell 2 rotates, so as to facilitate the measurer or user to quickly read the measurement result or measurement data of the brake disc thickness from the display 4. It not only enables the measurer or user to read the measurement result 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 non-rotatable, resulting in the measurer or user being unable to read the data displayed on the display 4 from multiple different angles and unable to measure the thickness of the brake disc from multiple different angles or multiple different directions, resulting in poor operation flexibility, large use limitations, inconvenient use and inconvenient reading of measurement results.

[0062] A spring 22 is arranged 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. After the thickness of the brake disc is measured, when 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 pull the bent measuring head 18 to move towards the direction of the strong magnet 16 and contact each other, so that the bent measuring head 18 can be automatically reset after the test, thus solving the trouble that the existing electronic calipers on the market need to be manually pushed to reset after measurement.

[0063] Two sleeve sealing rings 10 are sleeved on the sleeve 1. The sleeve sealing rings 10 strengthen the sealing performance at the joint of the outer shell 2 and the sleeve 1. At the same time, a silica gel front sleeve 35 is arranged on the outer side of one end of the silica gel protective sleeve 34. The silica gel front sleeve 35 is installed in the sleeve 1. The design of the silica gel front sleeve 35 strengthens the sealing performance at the joint of the sleeve 1 and the silica gel protective sleeve 34. In addition, a silica gel rear sleeve 36 is arranged inside the other end of the silica gel protective sleeve 34. The design of the silica gel rear sleeve 36 strengthens the sealing performance at the joint of the silica gel protective sleeve 34 and the handle 25, making it have excellent waterproof and dustproof effects. It also sleeved a limit sleeve 37 on the silica gel protective sleeve 34. The limit sleeve 37 is threadedly connected with the sleeve 1. The design of the limit sleeve 37 limits the silica gel protective sleeve 34 to prevent the silica gel protective sleeve 34 from arching when being pressed.

[0064] Its overall structural design has the advantages of simple measurement, high measurement efficiency, high measurement accuracy, and convenient reading of measurement results for the brake disc. The brake disc measured by it can ensure braking safety, and there is no need to pad a gasket during the measurement process of the brake disc thickness, so there is no need to subtract the thickness of the gasket according to the final measurement result. It greatly shortens the measurement time and significantly reduces the measurement error for the brake disc, effectively solving the problems of low measurement efficiency, large measurement error, and poor measurement effect caused by the measurement method of using a caliper to measure the brake disc and needing to pad a gasket in the current market.

[0065] The above embodiments are only an example of the present invention and are not used to limit the implementation and scope of rights of the present invention. Any technical solutions identical or equivalent to the content described in the claims of the present invention should be included within the protection scope of the present invention.

Claims

1. Brake disc measuring instrument, characterized in that: It includes a sleeve, an outer shell is sleeved outside the sleeve, a measuring rod assembly is arranged inside the sleeve, and a display is arranged on the outer shell; A battery installation hole is also arranged on the outer shell, a battery is installed in the battery installation hole, a circuit board is arranged above the battery, and the battery is electrically connected to the circuit board through electrode sheets; A sleeve installation hole is arranged at one end of the outer shell, the sleeve penetrates through the sleeve installation hole, a flexible circuit board is sleeved on the outer circumference of the sleeve, a moving grating plate vertically penetrates through the sleeve, a fixed limit pin is arranged radially perpendicular to the sleeve, the fixed limit pin protrudes from the outer circumference surface of the sleeve, a movable limit pin is inserted in the sleeve installation hole, the movable limit pin is vertically arranged with respect to the sleeve, and the fixed limit pin and the movable limit pin are located on the same radial section of the sleeve; when the outer shell rotates relative to the sleeve, the fixed limit pin limits the movable limit pin to limit the rotation of the sleeve relative to the outer shell; The measuring rod assembly includes a measuring rod that movably penetrates through the sleeve, a guide sleeve is sleeved on the measuring rod, one end of the guide sleeve is butt - joint 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 head seat; a strong magnet is arranged at one end of the probe head seat, the strong magnet protrudes from the side surface of the probe head seat, a bushing is arranged through the other end of the probe head seat, one end of the measuring rod movably penetrates through the bushing and extends out of the bushing, a bent probe head is arranged on the side of the probe head seat facing away from the sleeve, one end of the bent probe head is connected and installed with the measuring rod, and the other end of the bent probe head bends and extends to be arranged opposite to the strong magnet, and the strong magnet provides magnetic force to attract and tighten the bent probe head; a fixed grating seat is installed on the measuring rod inside the sleeve, a fixed grating is arranged on the fixed grating seat, the moving grating plate is arranged opposite to the fixed grating, and the fixed grating moves telescopically in the sleeve along with the measuring rod; one end of the wound flexible circuit board is connected and installed with the moving grating plate, and the other end of the flexible circuit board is connected and installed with the circuit board; a spring is arranged inside 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 arranged at the end of the measuring rod away from the probe head 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 double - headed 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 rotation angle of the outer shell on the sleeve is 0° - 270°.

3. The brake disc measuring instrument according to claim 1, characterized in that: The display includes a backlight plate arranged on the circuit board, a liquid crystal panel is arranged above the backlight plate, a panel is arranged above the liquid crystal panel, buttons and a button base plate are arranged on the panel, the buttons are installed on the panel through the button base plate, and a lens for dust and water protection is also arranged above the panel.

4. The brake disc measuring instrument according to claim 1, characterized in that: Two sleeve sealing rings are sleeved on the sleeve.

5. The brake disc measuring instrument according to claim 1, characterized in that: A battery cover is arranged below 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, wherein: A silica gel protective sleeve is jointly sleeved on the measuring rod and the measuring rod extension rod, a silica gel front sleeve is arranged on the outer side of one end of the silica gel protective sleeve, and the silica gel front sleeve is installed inside the sleeve, and a silica gel rear sleeve is arranged inside the other end of the silica gel protective sleeve.

7. The brake disc measuring instrument according to claim 6, characterized in that: A limit sleeve is sleeved outside the silica gel protective sleeve, and the limit sleeve is threadedly connected with the sleeve.

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