Pneumatic contact type displacement sensor with front guide and side spring structure

Abstract

The utility model discloses a pneumatic contact type displacement sensor with a front guide and side spring structure. The pneumatic contact type displacement sensor comprises an outer shell, a probe assembly, a pneumatic assembly and a grating code ruler assembly, the probe assembly is fixedly connected with the front of the grating support through the probe rod, and the assembly process is simplified. The grating glass adopts an increment and absolute coding mixed stripe design, so that the signal anti-interference capability is improved; pins on the two sides of the grating support are embedded into the guide sliding grooves to form a linear guide pair, and the reset spring is laterally arranged beside the grating support to prevent vibration from interfering with the grating. The pneumatic assembly drives the push rod through the piston to link the grating support to retract, and the reset spring pushes the probe to stretch out, thereby realizing high-sensitivity contact measurement. The outer shell adopts a split type sealing design and is combined with a telescopic pipe outside the probe rod for protection, so that the IP67 dustproof and waterproof grade is reached; the problems that a traditional sensor is complex in structure, the precision is interfered by a spring, and the sealing performance is poor are solved, and the sensor is suitable for high-speed and high-precision industrial detection scenes.

Description

TECHNICAL FIELD

[0001] The utility model belongs to displacement sensor technical field, concretely relates to a positive direction and side spring structure's pneumatic contact type displacement sensor. BACKGROUND

[0002] The pneumatic contact type displacement sensor is often used for high-precision displacement measurement in industrial detection, and the displacement signal conversion is realized by combining the grating encoding technology through the pneumatic driving probe to contact the measured object. However, in the prior art, the sensor has the following deficiencies: first, the grating ruler assembly and the probe rod are connected in the side surface, which leads to complex internal structure layout, and the alignment of the grating and the guide sliding groove needs to be repeatedly debugged during assembly, which is difficult to disassemble during maintenance, increasing the labor cost; second, the reset spring is usually arranged above the grating glass, and the spring deformation or vibration is easily directly conducted to the grating surface, leading to the imaging deviation of the grating stripes, and the signal stability is significantly reduced, especially under the high-speed motion or frequent start-stop working condition; third, the traditional shell body has poor sealing performance, and the joint of the split type design is easy to penetrate dust or liquid, and the grating glass is easy to be polluted after long-term use, further reducing the measurement accuracy and equipment life; therefore, a pneumatic contact type displacement sensor with simplified structure, strong anti-interference performance and convenient maintenance is required to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a positive direction and side spring structure's pneumatic contact type displacement sensor, and solves the technical problems existing in the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A positive direction and side spring structure's pneumatic contact type displacement sensor, including probe assembly, pneumatic assembly and shell body, the shell body is provided with grating ruler assembly, linear motion guide assembly and PCBA circuit board in it;

[0006] The grating ruler assembly includes grating glass and 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, and the encoding mode adopts the hybrid encoding mode of incremental encoding and absolute encoding;The grating support is also provided with a pin;

[0007] The linear motion guide assembly is used for guiding the linear motion of the grating glass, and the linear motion guide assembly includes a guide block, the guide block is fixed in the shell body through a plurality of screws, and a guide sliding groove is arranged on the guide block;The end of the pin extends into the guide sliding groove, and the pin can slide along the guide sliding groove;

[0008] The pneumatic assembly and the probe assembly are respectively located on opposite sides of the outer shell, 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;

[0009] The pneumatic assembly comprises a push rod and a gas nozzle sleeve, the gas nozzle sleeve is installed at the end of the outer shell, a gas nozzle is installed at the end of the gas nozzle sleeve, a piston sleeve is fixedly arranged in the gas nozzle sleeve, a piston is slidably arranged in the piston sleeve, one end of the push rod is connected to the grating support, and the other end of the push rod extends into the piston sleeve and is connected to the piston;

[0010] An optical baffle and a prism are further fixedly arranged in the outer shell, the optical baffle and the prism are located below the grating glass, a reset spring is connected to the grating support, and the reset spring is arranged side by side on one side of the grating support.

[0011] Further, 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 installed on the upper cover, the display screen is connected with a PCBA circuit board, a sealing ring is arranged on the bottom surface of the upper 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 fixedly arranged 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 retainer 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 retainer, and the two ends of the extension pipe are respectively connected to the probe rod and the bushing retainer through snap rings.

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

[0015] Compared with the prior art, the utility model has the advantages that the utility model discloses a grating support and the front surface of the probe rod are connected, the internal structure is simplified, the assembly and maintenance efficiency are improved by more than 30%, the side reset spring avoids the mechanical interference of spring vibration on the grating glass in the traditional layout, cooperates with the hybrid encoding grating, reduces the displacement detection precision error, the sliding pair design of the guide sliding groove and the pin and the split type shell sealing structure improve the motion guide stability and the dustproof and waterproof performance, prolong the service life of the sensor, the linkage design of the probe rod and the pneumatic push rod is combined with the extension pipe protection, the measurement sensitivity and the anti-pollution ability are considered, and the utility model is suitable for high-speed and high-frequency industrial detection scenes. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present application, and form 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 is a perspective view of the present application;

[0018] Figure 2 is a side view of the present application;

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

[0020] Figure 4 is a structural schematic view of the present application after driving the upper cover;

[0021] Figure 5 is an exploded view of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with 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 in conjunction with the embodiments.

[0024] As Figures 1-5 shown, a specific embodiment 1 of a pneumatic contact type displacement sensor with front face guiding and side spring structure provided by the present application is provided:

[0025] A pneumatic contact type displacement sensor with front face guiding and side spring structure comprises an outer shell 1, a probe assembly, a linear motion guiding assembly, a pneumatic assembly, a grating scale assembly and a PCBA circuit board 2. The outer shell 1 is composed of an upper cover 3 and a base 4, and the two are waterproof and dustproof through a sealing ring 5. The base 4 is pasted with a label 6 at the bottom to identify the model parameters. An aviation plug 7 and an indicator light 8 are installed at the end and electrically connected with the internal PCBA circuit board 2 for state indication and external communication. The upper cover 3 is provided with a display screen 9 and a display screen window piece 10 for real-time display of measurement data.

[0026] The grating code ruler assembly comprises a grating glass 11 and a grating support 12; the grating glass 11 is installed on the grating support 12, the grating glass 11 is formed with a plurality of transparent lines and opaque lines, and the encoding mode adopts a hybrid encoding mode of incremental encoding and absolute encoding; the grating support 12 is further provided with a pin 13.

[0027] The linear motion guide assembly is used for guiding the linear motion of the grating glass 11, and comprises a guide block 14 fixed in the outer shell 1 by a plurality of screws, and a guide sliding groove 15 arranged on the guide block 14; the end of the pin 13 extends into the guide sliding groove 15, the pin 13 can slide along the guide sliding groove 15, and a reset spring 16 is connected in the outer shell 1, the reset spring 16 is connected to the grating support 12, and the reset spring 16 is arranged side by side on one side of the grating support 12, so as to avoid affecting the grating glass 11 during installation and use, and further affecting the detection precision.

[0028] The pneumatic assembly and the probe assembly are respectively located on opposite sides of the outer shell 1, the probe assembly comprises a probe rod 17 and a measuring head 18, the measuring head 18 is arranged at one end of the probe rod 17, and the other end of the probe rod 17 is fixedly connected with the grating support 12; the probe assembly further comprises a sliding steel ball bearing 19 and a probe pipe 20, the probe pipe 20 is fixed at the end of the base 4, the sliding steel ball bearing 19 is arranged in the probe pipe 20 and can slide relative to the probe pipe 20, the probe rod 17 is arranged in the sliding steel ball bearing 19 and has a fixed relationship with the sliding steel ball bearing 19, and a bushing collar 21 is arranged at the end of the probe pipe 20.

[0029] The probe rod 17 is sleeved with a telescopic pipe 22, the telescopic pipe 22 is located between the measuring head 18 and the bushing collar 21, and the two ends of the telescopic pipe 22 are respectively installed on the probe rod 17 and the bushing collar 21 through clamping rings 23.

[0030] The pneumatic assembly comprises a push rod 24 and a gas nozzle sleeve 25, the gas nozzle sleeve 25 is installed at the end of the outer shell 1, a gas nozzle 26 is installed at the end of the gas nozzle sleeve 25, a piston sleeve 27 is fixed in the gas nozzle sleeve 25, and a piston 28 is slidably installed in the piston sleeve 27; one end of the push rod 24 is connected to the grating support 12, and the other end of the push rod 24 extends into the piston sleeve 27 and is connected with the piston 28. When compressed gas enters the piston sleeve 27 through the gas nozzle 26, the piston 28 and the push rod 24 are pushed to retract, the grating support 12 is driven to move along the guide sliding groove 15, and the probe rod 17 is extended; after pressure relief, the reset spring 16 drives the grating support 12 to reset, and the probe rod 17 is retracted.

[0031] The light barrier 29 and the prism 30 are arranged below the grating glass 11, and the photoelectric sensor (not shown) of the PCBA circuit board 2 receives the light signal change of the grating stripe through the prism 30, and converts the light signal change into an electric signal, and then the displacement amount is displayed by the display screen (such as an OLED screen).

[0032] It should be noted that in this document, such as the term "comprise", "include" or any other variant thereof is intended to cover the non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in such process, method, article or equipment.

[0033] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A pneumatic contact displacement sensor with a front-guided and side-mounted spring structure, characterized in that: It includes a probe assembly, a pneumatic assembly, and a housing. The housing contains a grating scale assembly, a linear motion guide assembly, and a PCBA circuit board. The grating scale assembly includes a grating glass and a grating support; the grating glass is mounted on the grating support, and several transparent and opaque lines are formed on the grating glass. Its encoding method adopts a hybrid encoding method of incremental encoding and absolute encoding; the grating support is also provided with pins. The linear motion guide assembly is used to guide the grating glass to move in a straight line. The linear motion guide assembly includes a guide block, which is fixed to the housing by several screws. A guide groove is provided on the guide block. The end of the pin extends into the guide groove and can slide along the guide groove. The pneumatic assembly and the probe assembly are located on opposite sides of the outer casing. The probe assembly includes a probe rod and a measuring head. The measuring head is located at one end of the probe rod, and the other end of the probe rod is fixedly connected to the grating bracket. The pneumatic assembly includes a push rod and a nozzle sleeve. The nozzle sleeve is installed at the end of the housing and a nozzle is installed at the end of the nozzle sleeve. A piston sleeve is fixed inside the nozzle sleeve and a piston is slidably installed inside the piston sleeve. One end of the push rod is connected to the grating bracket, and the other end of the push rod extends into the piston sleeve and is connected to the piston. A light-shielding plate and a prism are also fixed inside the outer casing. The light-shielding plate and the prism are located below the grating glass. A reset spring is connected inside the outer casing. The reset spring is connected to the grating support and is located side by side on one side of the grating support.

2. The pneumatic contact displacement sensor with a front-guided and side-mounted spring structure according to claim 1, characterized in that: The outer casing includes a top cover and a base. The top cover can be fastened onto the base. A display screen and a display window are installed on the top cover. The display screen is connected to the PCBA circuit board. A sealing ring is provided on the bottom surface of the top cover. A label is affixed to the bottom of the base.

3. A pneumatic contact displacement sensor with a front-guided and side-mounted spring structure according to claim 2, characterized in that: The probe assembly also includes a sliding ball bearing and a probe tube. The probe tube is fixed to the end of the base. The sliding ball bearing is disposed inside the probe tube and can slide relative to the probe tube. The probe rod passes through the sliding ball bearing, and the probe rod and the sliding ball bearing are fixedly connected. A bushing retainer is installed at the end of the probe tube.

4. A pneumatic contact displacement sensor with a front-guided and side-mounted spring structure according to claim 3, characterized in that: The probe rod is fitted with a telescopic tube, which is located between the measuring head and the bushing retaining ring. The two ends of the telescopic tube are respectively installed on the probe rod and the bushing retaining ring by retaining rings.

5. A pneumatic contact displacement sensor with a front-guided and side-mounted spring structure according to claim 4, characterized in that: The base is equipped with an indicator light and an aviation connector at its end, both of which are connected to the PCBA circuit board.

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