High-precision contact type thickness measuring device

Abstract

A high-precision contact-type thickness measuring device relates to the technical field of thickness detection and comprises a probe shell and a bottom shell, a circuit board assembly is fixedly mounted in an inner cavity of the probe shell, a coil module is mounted on the circuit board assembly, a cylinder part is fixedly connected to the bottom of the circuit board assembly, a groove is formed in the bottom of the cylinder part, and the coil module is mounted in the groove. The side wall of the inner cavity of the groove is provided with a notch part, the notch part is internally and rotatably provided with a connector, the connector is provided with a pin, and the pin is fixedly connected with a base. According to the utility model, the wear-resistant part is additionally arranged on the contact surface with a measured object, so that the wear resistance of the contact surface is improved; therefore, the fault rate of the measuring device is greatly reduced, the operation time is prolonged, the contact stability between the measuring device and a measured object in the long-time detection process is effectively ensured through the fixation and arrangement of the pins, and the measuring error is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thickness detection, in particular to a high-precision contact thickness measuring device. Background Art

[0002] Thickness measurement is a technology widely used in various fields, including industry, manufacturing, and scientific research. Depending on the object being measured, a variety of methods can be used for thickness measurement, including contact and non-contact methods. Eddy current thickness measurement is the most commonly used contact method, utilizing the eddy current effect to measure the thickness of a non-conductive coating on a conductive substrate by detecting changes in the magnetic field. However, when using eddy current thickness measurement, we have found that when the actuator and sensing terminals come into contact with the object being measured, the contact surface is prone to friction damage, is not wear-resistant, and has poor measurement stability, resulting in a high failure rate. Utility Model Content

[0003] The purpose of the present invention is to provide a high-precision contact thickness measuring device to solve the problems raised in the above background technology.

[0004] The utility model solves the technical problem by adopting the following technical solutions:

[0005] A high-precision contact thickness measuring device comprises a probe housing and a bottom shell, a circuit board assembly is fixedly installed in the inner cavity of the probe housing, a coil module is installed on the circuit board assembly, a cylindrical portion is fixedly connected to the bottom of the circuit board assembly, a groove is provided at the bottom of the cylindrical portion, a notch portion is provided on the inner cavity side wall of the groove, a connector is rotatably installed in the notch portion, a pin is installed on the connector, a base is fixedly connected to the pin, a flexible airbag actuator is fixedly installed on the upper end surface of the base, the upper end of the flexible airbag actuator is connected to the top wall of the groove, and a wear-resistant part is fixedly embedded in the bottom circular hole of the base.

[0006] Preferably, the pin is provided with a vertical plate portion 1 near one end of the connector, and a vertical plate portion 2 is provided at the center line position of the pin. A fixing rod is fixedly connected between the vertical plate portion 2 and the vertical plate portion 1, and the end of the fixing rod is fixedly connected to the connector.

[0007] Preferably, the middle area of the pin is a horizontal straight plate, and the edges on both sides are tilted upward and arranged close to the middle.

[0008] Preferably, the bottom shell is fixedly mounted on the bottom of the probe housing, and a circular through hole is provided at the center of the bottom shell, and the cylindrical portion is embedded in the circular through hole.

[0009] Preferably, an installation adjustment plate is fixedly mounted on the outer end surface of the bottom shell.

[0010] The advantages and positive effects of the utility model are:

[0011] The utility model increases the wear resistance of the contact surface by adding wear-resistant parts to the contact surface with the object to be measured, thereby greatly reducing the failure rate of the measuring device and improving the operating time. The fixation and setting of the pins effectively ensure the contact stability between the pin and the object to be measured during a long period of detection, thereby greatly reducing the measurement error. Moreover, the flexible airbag actuator is embedded in the groove, which can prevent deviation to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the overall structure of a high-precision contact thickness measuring device of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of a high-precision contact thickness measuring device of the utility model from an upward perspective;

[0015] Figure 3 This is a schematic diagram of the expanded structure of a high-precision contact thickness measuring device of the utility model;

[0016] Figure 4 This is a schematic diagram of the partially enlarged structure of the pins in a high-precision contact thickness measuring device of the present invention;

[0017] Figure 5 This is a schematic diagram of a partially enlarged structure of a pin in a high-precision contact thickness measuring device of the utility model from another perspective.

[0018] The symbols in the accompanying drawings are described as follows: probe housing 10; bottom shell 11; mounting adjustment plate 12; circuit board assembly 13; coil module 14; cylindrical portion 15; groove 16; notch portion 17; flexible airbag actuator 18; base 19; wear-resistant part 20; connector 21; pin 22; vertical plate portion 1 23; fixing rod 24; vertical plate portion 25. DETAILED DESCRIPTION

[0019] The present invention will now be further described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic way, and therefore only show the structures related to the present invention.

[0020] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several 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 thorough and comprehensive.

[0021] The following combination Figure 1-5 The utility model is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front and back directions mentioned below are the same as Figure 1 The front, back, left, right, up and down directions of the view are consistent. Figure 1 The directions shown are consistent with the front, back, left, right, up and down directions of the device of the present invention when viewed from the front.

[0022] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to mechanical connection, direct connection, or indirect connection through an intermediate medium; they can refer to internal communication between at least two components or interaction between at least two components, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0023] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings:

[0024] See also Figure 1-5, an embodiment provided by the utility model: a high-precision contact thickness measuring device, comprising an execution end located on the upper side and a sensing end on the lower side, wherein the execution end is identical to the sensing end as a whole, the difference being the internal coil module 14, the coil module 14 in the execution end is an excitation coil, which is a energized coil. When current passes through, an alternating magnetic field is generated, and this magnetic field generates eddy currents on the surface of the object being measured, while the coil module 14 in the sensing end is an induction coil. When eddy currents are formed on the surface of the object being measured, these eddy currents will cause changes in the nearby magnetic field, thereby affecting the magnetic field strength in the induction coil, and then the signal processing circuit in the circuit board assembly 13 is used to detect the changes in the induction coil and convert these changes into electrical signals. By analyzing these electrical signals, it can be concluded that The thickness information of the object to be measured is obtained by the circuit board assembly 13 being installed in the inner cavity of the probe housing 10, and the coil module 14 being installed on the circuit board assembly 13. At the same time, a cylindrical portion 15 is fixedly connected to the bottom of the circuit board assembly 13, and a groove 16 is provided at the bottom of the cylindrical portion 15. A bottom shell 11 is fixedly installed at the bottom of the probe housing 10, wherein a circular through hole is provided in the center of the bottom shell 11, which just allows the cylindrical portion 15 to be embedded therein, so that the groove 16 is exposed at the bottom of the bottom shell 11. It should be noted that, in order to ensure good contact with the object to be measured, a pin 22 is installed in the groove 16, and the narrow end of the pin 22 is fixedly connected to the base 19, and the long end is installed on the connector 21, and the connector 21 is rotatably installed in the notch 17 through a rotating shaft.

[0025] It should also be noted that in order to ensure the stability of the contact between the execution end, the sensing end and the object to be measured, a flexible airbag actuator 18 is installed on the upper end surface of the base 19, and the upper end of the flexible airbag actuator 18 is connected to the top wall of the groove 16, so that the base 19 can be controlled to move toward the object to be measured by driving the flexible airbag actuator 18. Since both the execution end and the sensing end must be in contact with the object to be measured, this will inevitably cause wear on the contact surface of the measuring device. Over time, the wear will be greater, which will lead to measurement errors. In order to reduce the failure rate of the measuring device and increase the wear resistance time, a circular hole is opened at the bottom of the base 19, and a wear-resistant part 20 is fixedly embedded in the circular hole, wherein the wear-resistant part 20 can be doped diamond or silicon carbide, graphene, etc.

[0026] It is worth mentioning that in order to ensure the stability of the pin 22 when it moves downward and contacts the object to be measured, in this embodiment, the pin 22 is provided with a vertical plate portion 23 at one end close to the connecting head 21, and a vertical plate portion 25 is provided at the center line position of the pin 22. A fixing rod 24 is connected through the vertical plate portion 25 and the vertical plate portion 23, and the end of the fixing rod 24 is fixedly connected to the connecting head 21. At the same time, the middle area of the pin 22 is a horizontal straight plate, and the edges on both sides are curled upward and set close to the middle.

[0027] It should also be noted that in order to facilitate the installation and position adjustment of the measuring device, a mounting adjustment plate 12 is fixedly connected to the bottom shell 11. The multiple strip-shaped holes on the mounting adjustment plate 12 can effectively assist in installation and position adjustment.

[0028] During specific implementation, the sensing end and the execution end are both installed at the quality inspection exit of the production line of the object to be measured, so that the object to be measured is located between the sensing end and the execution end. Each time an inspection is performed, the airflow enters the flexible airbag actuator 18, driving the base 19 to move toward the object to be measured, thereby allowing the wear-resistant part 20 to come into contact with the object to be measured. At this time, the excitation coil in the execution end is energized, and the generated alternating magnetic field acts on the surface of the object to be measured, generating eddy currents on the surface. These eddy currents will generate their own magnetic fields, which will interact with the original magnetic field, thereby affecting the magnetic field strength in the induction coil of the sensing end. The thickness of the object to be measured will affect the strength and distribution of the eddy currents, thereby changing the degree of magnetic field change detected in the induction coil. The signal processing circuit in the circuit board assembly 13 is then used to detect the changes in the induction coil and convert these changes into electrical signals. By analyzing these electrical signals, the thickness information of the object to be measured can be obtained.

[0029] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention is not limited to the embodiments described in the specific implementation methods. Any other implementation methods derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A high-precision contact thickness measuring device, comprising a probe housing (10) and a bottom housing (11), characterized in that: A circuit board assembly (13) is fixedly installed in the inner cavity of the probe housing (10), a coil module (14) is installed on the circuit board assembly (13), a cylindrical portion (15) is fixedly connected to the bottom of the circuit board assembly (13), a groove (16) is provided at the bottom of the cylindrical portion (15), a notch portion (17) is provided on the inner cavity side wall of the groove (16), a connector (21) is rotatably installed in the notch portion (17), a pin (22) is installed on the connector (21), a base (19) is fixedly connected to the pin (22), a flexible airbag actuator (18) is fixedly installed on the upper end surface of the base (19), the upper end of the flexible airbag actuator (18) is connected to the top wall of the groove (16), and a wear-resistant part (20) is fixedly embedded in the bottom circular hole of the base (19).

2. A high-precision contact thickness measuring device according to claim 1, characterized in that: The pin (22) is provided with a vertical plate portion 1 (23) at one end close to the connector (21), and a vertical plate portion 2 (25) is provided at the center line position of the pin (22). A fixing rod (24) is fixedly connected between the vertical plate portion 2 (25) and the vertical plate portion 1 (23), and the end of the fixing rod (24) is fixedly connected to the connector (21).

3. The high-precision contact thickness measuring device according to claim 2, characterized in that: The middle area of the pin (22) is in the form of a horizontal straight plate, and the edges on both sides are tilted upwards and arranged close to the middle.

4. The high-precision contact thickness measuring device according to claim 3, characterized in that: The bottom shell (11) is fixedly mounted on the bottom of the probe housing (10), and a circular through hole is provided at the center of the bottom shell (11), and the cylindrical portion (15) is embedded in the circular through hole.

5. The high-precision contact thickness measuring device according to claim 4, characterized in that: An installation adjustment plate (12) is fixedly mounted on the outer end surface of the bottom shell (11).

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