Contact type displacement sensor guided by double sliding steel ball bearings

Abstract

The utility model discloses a contact type displacement sensor guided by a double-sliding steel ball bearing. The contact type displacement sensor comprises an outer shell, a probe assembly, a guide rod assembly and a grating code ruler assembly. The probe assembly realizes friction-free horizontal movement and longitudinal deviation inhibition (less than or equal to 0.01 mm) of a probe rod through a double limiting structure of a first sliding steel ball bearing (for polish rod guiding) and a second sliding steel ball bearing (for probe tube guiding); the grating code ruler assembly adopts grating glass of incremental and absolute hybrid coding and is combined with a prism-shading plate optical system, so that the resolution is improved to 0.1 mu m while the measurement range (+ / -50mm) is expanded; the problems that a traditional sensor is low in guiding precision, single in coding mode and poor in anti-interference performance are solved, and the sensor has high repetition precision, long service life and industrial scene applicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to displacement sensor technical field, concretely relates to a contact type displacement sensor of double sliding steel ball bearing guide. BACKGROUND

[0002] The contact type displacement sensor is a kind of device that target object displacement is measured by physical contact, is widely used in industrial detection, precision machining, automation control and other fields.The existing contact type displacement sensor usually adopts slide rail structure to realize the linear motion of probe, above-mentioned mode is prone to longitudinal deviation in movement process due to high friction coefficient or assembly gap, influence measurement precision, therefore its guiding precision and stability have certain limitation, in addition, single coding mode (such as only incremental coding or absolute coding) can lead to error accumulation or low reset efficiency. SUMMARY

[0003] The utility model aims at providing a contact type displacement sensor of double sliding steel ball bearing guide, solves the technical problem of low measurement precision of existing contact type displacement sensor.

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

[0005] A contact type displacement sensor of double sliding steel ball bearing guide, including probe assembly and shell body, shell body is provided with grating scale assembly, guide rod assembly and PCBA circuit board in it;

[0006] The grating scale 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 coding mode adopts hybrid coding of incremental coding and absolute coding;

[0007] The guide rod assembly includes light pole and two guide rod fixed seats, and the two guide rod fixed seats are fixed in the shell body by a plurality of screws, and the two ends of the light pole are installed on the two guide rod fixed seats;First sliding steel ball bearing is installed on grating support, and the first sliding steel ball bearing is axially limited by steel wire retainer ring, the first sliding steel ball bearing is sleeved on the light pole, and the first sliding steel ball bearing can slide on the light pole;

[0008] The probe assembly includes probe rod and measuring head, and 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 light shield and the prism are also fixed in the shell body, and the light shield and the prism are located below the grating glass, and the reset spring is connected in the shell body, and the reset spring is connected to the grating support.

[0010] Further, the outer shell comprises a cover and a base, the cover can be buckled on the base, a display screen and a display screen window piece are installed on the cover, the display screen is connected with the PCBA circuit board, a sealing ring is arranged on the bottom surface of the cover, and a label is pasted on the bottom of the base.

[0011] Further, the probe assembly further comprises a second sliding steel ball bearing and a probe pipe, the probe pipe is fixed at the end of the base, the second 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 second sliding steel ball bearing and has a fixed relationship with the second sliding steel ball bearing, and a bushing ring is installed at the end of the probe pipe.

[0012] Further, the probe rod is sleeved 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 installed on the probe rod and the bushing ring through snap rings respectively.

[0013] 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.

[0014] Compared with the prior art, the contact type displacement sensor of the utility model realizes the horizontal frictionless sliding and longitudinal deviation control (≤0.01mm) of the probe rod through the cooperative design of the double sliding steel ball bearings (first and second bearings) and the guide rod assembly, combines the incremental / absolute hybrid encoding technology of the grating glass, and simultaneously expands the measurement range (±50mm) and improves the resolution to 0.1μm; the reset spring and the prism-shutter optical system ensure the fast reset and signal stability, and the dustproof structure of the sealing ring and the extension pipe and the low-wear bearing make the sensor have high precision (repeatability error <0.5%), strong anti-interference (suitable for dust / oil environment) and long service life (>100 million cycles), and solve the technical defects of low guiding precision, single encoding mode and poor environmental adaptability of the traditional sensor. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0016] Figure 1 It is the isometric view of the utility model;

[0017] Figure 2 It is the side view of the utility model;

[0018] Figure 3 It is Figure 2 The section view at H in the middle;

[0019] Figure 4This is an isometric view of the present invention after the top cover has been removed;

[0020] Figure 5 This is an exploded view of the present invention. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The present invention will be further described in detail below with reference to the embodiments.

[0023] like Figures 1-5 As shown, a specific embodiment of the contact displacement sensor guided by a double sliding ball bearing provided by this utility model is as follows:

[0024] A contact displacement sensor guided by a double sliding ball bearing includes a housing 1, a probe assembly, a guide rod assembly, a grating scale assembly, and a PCBA circuit board 2. The housing 1 is composed of a top cover 3 and a base 4 fastened together, and the two are waterproofed and dustproofed by a sealing ring 5. A label 6 is affixed to the bottom of the base 4, and an aviation plug 7 and an indicator light 8 are installed at the end, which are electrically connected to the internal PCBA circuit board 2. The top cover 3 is equipped with a display screen 9 and a display window 10 for real-time display of measurement data.

[0025] The grating scale assembly consists of a grating glass 11 and a grating support 12. The surface of the grating glass 11 is formed with transparent / opaque lines that combine incremental and absolute encoding through photolithography, achieving both large-range measurement and high resolution through the hybrid encoding method. The grating support 12 is connected to the guide rod assembly via a first sliding ball bearing 13. The guide rod assembly includes a light rod 14 and two guide rod fixing seats 15. The guide rod fixing seats 15 are fixed in the base 4 with screws, and the two ends of the light rod 14 are supported by the guide rod fixing seats 15. The first sliding ball bearing 13 is axially limited by a wire retaining ring 16 through a hole, ensuring that it slides only horizontally along the light rod 14 and eliminating longitudinal offset.

[0026] The probe assembly includes a probe rod 17, a measuring head 18, a second sliding ball bearing 19, and a probe tube 20. The probe tube 20 is fixed to the end of the base 4. The second sliding ball bearing 19 is embedded in the probe tube 20 and fixedly connected to the probe rod 17. One end of the probe rod 17 is connected to the measuring head 18, and the other end is fixedly connected to the grating bracket 12. The end of the probe tube 20 is provided with a bushing retaining ring 21 to prevent the second sliding ball bearing 19 from coming out. The probe rod 17 is covered with a telescopic tube 22, which is fixed at both ends by retaining rings 23 for dust prevention and mechanical protection.

[0027] A light shield 24 and a prism 25 are arranged below the grating glass 11 for reflecting the grating signal to the photoelectric sensor on the PCBA circuit board 2, so as to realize accurate reading of the displacement signal; one end of a reset spring 26 is fixed to the base 4, and the other end is connected to the grating support 12, so as to ensure that the probe rod 17 is automatically reset to the initial position when no external force is applied.

[0028] During measurement, the measurement head 18 contacts the measured object and pushes the probe rod 17 to move horizontally along with the displacement of the measured object, so as to drive the grating support 12 to slide along the light rod 14; the first sliding steel ball bearing 13 and the second sliding steel ball bearing 19 cooperate to constrain the probe rod 17 to move only in the axial direction of the light rod 14, so as to avoid longitudinal deviation; the mixed encoding signal of the grating glass 11 is reflected to the PCBA circuit board 2 through the prism 25, and after processing, the displacement value is output through the display screen 9, and at the same time, the displacement value is transmitted to the external equipment through the aviation plug 7.

[0029] It should be noted that in this document, such as the term "comprising", "including" or any other variant thereof is intended to cover 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 includes elements inherent to such process, method, article or equipment.

[0030] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A contact displacement sensor with dual sliding steel ball bearing guides, characterized by: The application relates to a light barrier code ruler assembly and a probe assembly. The light barrier code ruler assembly comprises a light barrier glass and a light barrier support, the light barrier glass is installed on the light barrier support, the light barrier glass is provided 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 guide rod assembly comprises a light rod and two guide rod fixing seats, the two guide rod fixing seats are fixed in the outer shell through a plurality of screws, and the two ends of the light rod are installed on the two guide rod fixing seats; a first sliding steel ball bearing is installed on the light barrier support, the first sliding steel ball bearing is axially limited through a hole steel wire retainer, the first sliding steel ball bearing is sleeved on the light rod, and the first sliding steel ball bearing can slide on the light rod. 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 light barrier support. An optical shield and a prism are further fixed in the outer shell, the optical shield and the prism are located below the light barrier glass, a reset spring is connected to the light barrier support in the outer shell.

2. A contact displacement sensor with dual sliding steel ball bearing guide 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 installed 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 attached to the bottom of the base.

3. A contact displacement sensor with dual sliding steel ball bearing guide according to claim 2, characterized in that: The probe assembly further comprises a second sliding steel ball bearing and a probe pipe, the probe pipe is fixed at the end of the base, the second 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 second sliding steel ball bearing and is in a fixed relationship with the second sliding steel ball bearing, and a bushing retainer is installed at the end of the probe pipe.

4. A contact displacement sensor with dual sliding steel ball bearing guide according to claim 3, characterized in that: A telescopic pipe is sleeved on the probe rod, the telescopic pipe is located between the measuring head and the bushing retainer, and the two ends of the telescopic pipe are respectively installed on the probe rod and the bushing retainer through snap rings.

5. A contact displacement sensor with dual sliding steel ball bearing guide according to claim 4, characterized in that: An indicating lamp and an aviation plug are installed at the end of the base, and the indicating lamp and the aviation plug are connected with the PCBA circuit board.

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