Contact type displacement sensor with high stability and accuracy

Abstract

A contact type displacement sensor with high stability and accuracy comprises a probe assembly and an outer shell, and a grating code ruler assembly, a linear motion guide assembly and a PCBA circuit board are arranged in the outer shell. The grating code ruler assembly comprises grating glass and a grating support. The grating glass is installed on the grating support, and a plurality of transparent lines and opaque lines are formed on the grating glass. In conclusion, the pin is adopted to replace traditional threaded connection to achieve rigid positioning of the grating code ruler assembly, accumulative errors caused by assembly gaps and vibration are effectively eliminated, and the movement stability and the measurement repeatability are remarkably improved by combining a low-friction matching structure of the guide sliding groove and the pin; according to the overall structure, the assembly process is simplified, the abrasion risk of long-term use is reduced, high-stability and high-precision continuous displacement detection can be achieved in a complex industrial environment, and the strict requirement for measurement reliability in the precision manufacturing field is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to displacement sensor technical field, concretely relates to a high stable precision contact type displacement sensor. BACKGROUND

[0002] As the core element in the field of industrial measurement, precision machining and automatic control, the measurement accuracy and stability of displacement sensor directly determine the equipment performance and data reliability. Contact type displacement sensor is widely used in surface profile detection and micro displacement monitoring due to its direct contact with the measured object. However, the performance of traditional contact type displacement sensor under complex working conditions still faces many challenges.

[0003] In the prior art, there are significant defects in the design of the guide mechanism and the positioning structure of the grating encoding type sensor. For example, the positioning of the grating ruler assembly often relies on threaded connection, which is easy to cause the increase of thread gap due to vibration or long-term wear, resulting in grating deviation or assembly cumulative error, which seriously affects the measurement accuracy. The cooperation between the guide sliding groove and the moving part often adopts sliding friction structure, which is easy to produce wear and jam after long-term use, reducing the motion stability. In addition, the moving part of the traditional probe assembly lacks rigid positioning design, which is easy to produce small displacement deviation due to external interference or mechanical vibration, further reducing the measurement repeatability and reliability. Therefore, there is an urgent need for a new contact type displacement sensor that can balance high precision and high stability in complex environments. SUMMARY

[0004] The utility model aims at providing a kind of high stable precision contact type displacement sensor, solve the technical problems that existing contact type displacement sensor lacks high precision, stability.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A kind of high stable precision contact type displacement sensor, including probe assembly and shell body, grating ruler assembly, linear motion guide assembly and PCBA circuit board are arranged in shell body;

[0007] The grating ruler assembly includes grating glass and grating support;Grating glass is installed on grating support, and a plurality of transparent lines and opaque lines are formed on grating glass, and the encoding mode adopts hybrid encoding of incremental encoding and absolute encoding;Pin is further provided on the grating support;

[0008] Linear motion guide assembly is used to guide grating glass along straight line, and linear motion guide assembly includes guide block, guide block is fixed in shell body by a plurality of screws, and guide sliding groove is provided on guide block;The end of pin extends into guide sliding groove, and pin can slide along guide sliding groove;

[0009] The probe assembly comprises a probe rod and a measuring head, the measuring head is arranged at one end of the probe rod, and the other end of the probe rod is fixedly connected with the grating support;

[0010] The light shielding plate and the prism are arranged below the grating glass, the reset spring is connected in the outer shell, and the reset spring is connected to the grating support.

[0011] Further, the outer shell comprises a top cover and a base, the top cover can be buckled on the base, a display screen and a display screen window piece are arranged on the top cover, the display screen is connected with the PCBA circuit board, a sealing ring is arranged on the bottom surface of the top cover, and a label is attached to the bottom of the base.

[0012] Further, the probe assembly further comprises a sliding steel ball bearing and a probe pipe, the probe pipe is fixed at the end of the base, the sliding steel ball bearing is arranged in the probe pipe and can slide relative to the probe pipe, the probe rod is arranged in the sliding steel ball bearing and is in a fixed relationship with the sliding steel ball bearing, and a bushing stop ring is arranged at the end of the probe pipe.

[0013] Further, the probe rod is sleeved with an extension pipe, the extension pipe is located between the measuring head and the bushing stop ring, and the two ends of the extension pipe are respectively arranged on the probe rod and the bushing stop ring through snap rings.

[0014] Further, the end of the base is provided with an indicating lamp and an aviation plug, and the indicating lamp and the aviation plug are connected with the PCBA circuit board.

[0015] Compared with the prior art, the probe rod is rigidly connected with the grating support, and the sliding steel ball bearing is precisely guided, so that the anti-mechanical vibration and lateral interference capability is enhanced, and the micron-level measurement precision is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application. In the drawings:

[0017] Figure 1 It is a perspective view of a high-stable and precise contact type displacement sensor;

[0018] Figure 2It is a side view of a high-stable and precise contact displacement sensor;

[0019] Figure 3 It is Figure 2 It is a cross-sectional view at A-A;

[0020] Figure 4 It is a structural schematic view of the high-stable and precise contact displacement sensor after removing the upper cover;

[0021] Figure 5 It is an exploded view of a high-stable and precise contact displacement sensor. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] The present application will be further described in detail below with reference to the embodiments.

[0024] As Figures 1-5 shown, the specific embodiment 1 of the high-stable and precise contact displacement sensor provided by the present application comprises:

[0025] The high-stable and precise contact displacement sensor comprises a probe assembly and a shell body 1, and the shell body 1 is provided with a grating ruler assembly, a linear motion guide assembly and a PCBA circuit board 2. The shell body 1 comprises an upper cover 12 and a base 13, the upper cover 12 can be buckled on the base 13, a display screen 14 and a display screen window piece 15 are installed on the upper cover 12, the display screen 14 is connected with the PCBA circuit board 2, a sealing ring 16 is arranged on the bottom surface of the upper cover 12, and a label 17 is pasted on the bottom of the base 13.

[0026] The grating ruler assembly comprises a grating glass 3 and a grating support 4. The grating glass 3 is installed on the grating support 4, a plurality of transparent lines and opaque lines are formed on the grating glass 3, the coding mode adopts a hybrid coding mode of incremental coding and absolute coding, the working of the grating glass 3 is based on the principle of Moiré fringes, when two grating pieces (one is fixed on a machine as a reference, and the other moves with a moving part) overlap and move relative to each other, a bright and dark stripe pattern, i.e. Moiré fringes, will be generated in a specific direction, the change of these stripes can be captured by a photoelectric element and converted into an electrical signal, and after processing, accurate position information is obtained. The grating support 4 is also provided with a pin 5.

[0027] The linear motion guiding assembly is used for guiding the linear motion of the grating glass 3, and comprises a guiding block 6 fixed in the outer shell 1 by screws, and a guiding sliding groove 7 arranged on the guiding block 6; the end of the pin 5 extends into the guiding sliding groove 7, and the pin 5 can slide along the guiding sliding groove 7; the cooperation of the pin 5 and the guiding sliding groove 7 can guide the linear motion of the grating glass 3 and avoid the rotation of the grating glass 3 during the motion, thereby limiting the motion stroke.

[0028] The probe assembly comprises a probe rod 8, a measuring head 9, a sliding steel ball bearing 10 and a probe pipe 11, the measuring head 9 is arranged at one end of the probe rod 8, the other end of the probe rod 8 is fixedly connected with the grating support 4; the probe pipe 11 is fixed at the end of the base 13, the sliding steel ball bearing 10 is arranged in the probe pipe 11 and can slide relative to the probe pipe 11, the probe rod 8 is arranged in the sliding steel ball bearing 10 and has a fixed relationship with the sliding steel ball bearing 10, and a bushing retainer 18 is arranged at the end of the probe pipe 11.

[0029] An optical shield 19 and a prism 20 are also fixed in the outer shell 1, the prism 20 is pasted on the inner wall of the outer shell by a double-sided adhesive tape 21, the optical shield 19 and the prism 20 are located below the grating glass 3, a return spring 22 is connected in the outer shell 1, and the return spring 22 is connected to the grating support 4.

[0030] Since part of the probe rod 8 is in a bare state, in order to prevent it from being contaminated by dust, a telescopic pipe 23 can also be sleeved on the probe rod 8, the telescopic pipe 23 is located between the measuring head 9 and the bushing retainer 18, and the two ends of the telescopic pipe 23 are respectively installed on the probe rod 8 and the bushing retainer 18 by clamping rings 24.

[0031] An indicating lamp 25 and an aviation plug 26 are installed at the end of the base 13, the indicating lamp 25 and the aviation plug 26 are connected with the PCBA circuit board 2, the indicating lamp 25 is used for displaying the working state of the PCBA circuit board 2, and the aviation plug 26 is used for realizing the electrical connection between the sensor and the outside.

[0032] It should be noted that, in the present text, terms such as "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that the embodiments are capable of numerous variations, modifications, substitutions and changes without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-stable precision contact displacement sensor, characterized in that: The application relates to a linear displacement sensor, which comprises a probe assembly and an outer shell, wherein a grating scale assembly, a linear motion guide assembly and a PCBA circuit board are arranged in the outer shell. The grating scale assembly comprises a grating glass and a grating support; the grating glass is mounted on the grating support, a plurality of transparent lines and opaque lines are formed on the grating glass, and the coding mode adopts a hybrid coding mode of incremental coding and absolute coding; and a pin is further arranged on the grating support. The linear motion guide assembly is used for guiding the linear motion of the grating glass, and comprises a guide block which is fixed in the outer shell through a plurality of screws and is provided with a guide sliding groove; and the end of the pin is inserted into the guide sliding groove, and the pin can slide along the guide sliding groove. The probe assembly comprises a probe rod and a measuring head, the measuring head is arranged at one end of the probe rod, and the other end of the probe rod is fixedly connected with the grating support. A light shielding plate and a prism are further fixed in the outer shell and are located below the grating glass, a reset spring is connected to the grating support in the outer shell.

2. A high stable precision contact type displacement sensor according to claim 1, characterized in that: The outer shell comprises an upper cover and a base, the upper cover can be buckled on the base, a display screen and a display screen window piece are mounted on the upper cover, the display screen is connected with the PCBA circuit board, a sealing ring is arranged on the bottom surface of the upper cover, and a label is pasted on the bottom of the base.

3. A highly stable and precise contact type displacement sensor according to claim 2, characterized in that: The probe assembly further comprises a sliding steel ball bearing and a probe pipe, the probe pipe is fixed at the end of the base, the sliding steel ball bearing is arranged in the probe pipe and can slide relative to the probe pipe, the probe rod is arranged in the sliding steel ball bearing and is in a fixed relationship with the sliding steel ball bearing, and a bushing ring is mounted at the end of the probe pipe.

4. A highly stable and precise contact type displacement sensor according to claim 3, characterized in that: The probe rod is provided with an extension pipe, the extension pipe is located between the measuring head and the bushing ring, and the two ends of the extension pipe are mounted on the probe rod and the bushing ring through clamping rings.

5. A highly stable and precise contact type displacement sensor according to claim 4, characterized in that: The end of the base is provided with an indicating lamp and an aviation plug, and the indicating lamp and the aviation plug are connected with the PCBA circuit board.

Images