Gauge structure

Abstract

The utility model provides a scale structure which comprises a meter cylinder, a front shaft sleeve, a rear shaft sleeve, a measuring rod and a main grid seat. The meter barrel is in a hollow barrel shape, the front shaft sleeve and the rear shaft sleeve are oppositely installed at the front end and the rear end of the meter barrel, and at least one section of matching surfaces of the front shaft sleeve and the rear shaft sleeve and the meter barrel is in conical surface matching. The measuring rod slides along a channel formed by the front shaft sleeve, the meter cylinder and the rear shaft sleeve. The main grid base is located in the meter cylinder and fixedly connected to the measuring rod. The side wall of the meter cylinder is provided with a sensor installation groove, and the groove plane of the sensor installation groove serves as an auxiliary grating sensor installation surface and is parallel to the axis of the meter cylinder. The scale structure provided by the utility model ensures the coaxial installation of the front shaft sleeve and the rear shaft sleeve and the parallelism of the measuring rod and the mounting surface of the auxiliary grating sensor by utilizing the self-shaping characteristic of conical surface matching, can simplify the production and installation of the scale, and prevents the scale from being changed into a one-time assembly structure.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, and particularly relates to a gauge structure. Background Art

[0002] A gauge is an important measuring instrument in the machinery industry. It detects and outputs the linear displacement of a measuring rod through an electronic sensor to obtain target measurement data. The gauge includes mechanical components and an electronic sensor. The mechanical components usually include a case, a measuring rod, a front bushing, a rear bushing, and a tension spring; the electronic sensor usually includes a main and a secondary grating sensor that cooperate with each other. The secondary grating sensor and the main grating sensor are respectively installed on the case and the measuring rod to measure the relative displacement. The mechanical components serve as an assembly platform for the electronic sensor, and their assembly structure has an important impact on the accuracy of the gauge.

[0003] In the mechanical components of the gauge, the front bushing and the rear bushing are relatively installed at both ends of the case, and the measuring rod slides along the channel formed by the front bushing, the case, and the rear bushing. During assembly, it is necessary to ensure the coaxiality of the front bushing and the rear bushing to ensure the smooth sliding of the measuring rod. When assembling the existing gauge, usually after machining the parts by milling and turning, the front bushing, the rear bushing, and the case are pressed in by a tight fit. The press-in installation cannot ensure the coaxiality requirements of the front bushing and the rear bushing, and a reamer is also needed to ream and scrape the front bushing and the rear bushing to meet the coaxiality requirements. This installation method is time-consuming and laborious, and the accuracy of the reaming and scraping adjustment cannot be guaranteed, which cannot meet the requirements of industry development.

[0004] At the same time, the parallelism between the secondary grating and the main grating has an important impact on the measurement accuracy, so there are also requirements for the parallelism between the installation surface of the secondary grating sensor and the measuring rod. The above installation method for the front bushing and the rear bushing cannot ensure the parallelism between the measuring rod and the secondary grating. The traditional installation method requires further grinding or milling adjustment of the installation surface of the secondary grating or the main grating, which will make the gauge structure a one-time assembly structure, with low production efficiency, waste of manpower and material resources, and the parts cannot be directly replaced with new parts for repair after wear and damage.

[0005] Based on the above problems, it is necessary to propose a gauge structure that can accurately and quickly install the measuring rod, simplify the production and installation of the gauge, and avoid the gauge becoming a one-time assembly structure. Summary of the Utility Model

[0006] The utility model provides a gauge structure, which can effectively ensure the coaxial installation of the front bushing and the rear bushing, ensure the parallelism between the measuring rod and the installation surface of the secondary grating sensor, simplify the production and installation of the gauge, and avoid the gauge becoming a one-time assembly structure.

[0007] To achieve the above technical purposes and achieve the above technical effects, the utility model solves the above problems through the following technical solutions:

[0008] A scale structure includes a barrel, a front shaft sleeve, a rear shaft sleeve, a measuring rod and a main grid base; the barrel is a hollow cylindrical shape, the front shaft sleeve and the rear shaft sleeve are relatively installed at the front and rear ends of the barrel, and at least one section of the mating surface between the front shaft sleeve, the rear shaft sleeve and the barrel is a tapered surface fit; the measuring rod slides along the channel formed by the front shaft sleeve, the barrel and the rear shaft sleeve, and the main grid base is located inside the barrel and fixedly connected to the measuring rod; a sensor installation groove is opened on the side wall of the barrel, and the groove plane of the sensor installation groove serves as the installation surface of the secondary grid sensor and is parallel to the axis of the barrel.

[0009] In the above solution, the barrel adopts a hollow cylindrical structure, the front shaft sleeve and the rear shaft sleeve are relatively installed at the front and rear ends of the barrel by tapered surface fit. Utilizing the self-centering characteristic of the tapered surface, the front shaft sleeve and the rear shaft sleeve can ensure coaxial installation and ensure that the central axis of the shaft sleeve coincides with the axis of the barrel. The measuring rod slides along the channel formed by the front shaft sleeve, the watch case and the rear shaft sleeve, and the installation surface of the secondary grid sensor on the side wall of the barrel is parallel to the axis of the barrel, so the measuring rod is parallel to the installation surface of the secondary grid sensor. This assembly structure can quickly achieve the coaxial installation of the front shaft sleeve and the rear shaft sleeve and the parallel installation of the measuring rod and the secondary grid sensor, which can simplify the production and installation of the scale and improve the accuracy of the scale.

[0010] Further, the mating surfaces of the front shaft sleeve, the rear shaft sleeve and the barrel are divided into two sections, which are tapered surface fit and straight thread fit respectively.

[0011] Further, the tapered surface fit between the front shaft sleeve, the rear shaft sleeve and the barrel is a tapered thread fit.

[0012] Further, a guide rod along the axis direction of the barrel is installed on the inner wall of the barrel, and a chute is provided on the main grid base to slidably cooperate with the guide rod.

[0013] Further, a U-shaped assembly groove for fitting and sleeving with the measuring rod is opened on the main grid base, and the groove plane of the U-shaped assembly groove serves as the installation surface of the main grid sensor and is parallel to the installation surface of the secondary grid sensor.

[0014] Further, bearing positioning holes are opened at the outer ends of the front shaft sleeve and the rear shaft sleeve, and sliding bearings are respectively pressed into the bearing positioning holes of the front shaft sleeve and the rear shaft sleeve to form a front shaft sleeve assembly and a rear shaft sleeve assembly.

[0015] Further, the sliding bearing adopts a linear bearing or a spherical bearing.

[0016] Further, the cross section of the barrel is circular or regular N-sided polygon, where N is a positive integer greater than or equal to 3.

[0017] The advantages and effects of the present utility model are:

[0018] A scale structure proposed by the utility model has a hollow cylindrical structure for the barrel. The front shaft sleeve and the rear shaft sleeve are self-centered with a conical surface in cooperation with the barrel. After machining, each part is directly assembled, which can ensure the required coaxiality between the front shaft sleeve and the rear shaft sleeve of the scale and the parallelism between the electronic sensor and the measuring rod. This assembly structure does not require further machining adjustment, can ensure the consistency of the mechanism, the replaceability of parts, reduce the error introduced by the mechanism, make the data discreteness smaller and the data more accurate, and can improve production efficiency and reduce costs.

[0019] The scheme designs the barrel as a hollow cylindrical structure, which is beneficial to reducing the volume and weight of the scale and miniaturizing the mechanism, better adapting to the measurement occasions with small operable space, and reducing the requirement for the strength of the fixture. The main grid seat is provided with a chute that slides in cooperation with the guide rod, which can slide-guide the measuring rod, avoid the rotation of the measuring rod, further ensure the parallelism between the moving grid and the main grid, and improve the measurement accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the scale structure of Embodiment 1;

[0021] Figure 2 is Figure 1 axial sectional view of the scale structure shown;

[0022] Figure 3 is Figure 1 cross-sectional view of the scale structure shown;

[0023] Figure 4 axial sectional view of the scale structure of Embodiment 2;

[0024] Figure 5 axial sectional view of the scale structure of Embodiment 3;

[0025] Figure 6 axial sectional view of the scale structure of Embodiment 4;

[0026] Figure 7 axial sectional view of the scale structure of Embodiment 5;

[0027] Figure 8 axial sectional view of the scale structure of Embodiment 6;

[0028] Figure 9 axial sectional view of the scale structure of Embodiment 7;

[0029] Figure 10 Schematic diagram of the structure of the sliding bearing;

[0030] Figure 11 Schematic diagram of the cross-sectional structure of the barrel.

[0031] Drawing number identification:

[0032] 1. Dial housing, 1-1. Sensor installation groove, 1-2. Sub-grid sensor installation surface; 2. Front bushing, 3. Rear bushing, 4. Measuring rod, 5. Main grid base, 5-1. U-shaped assembly groove, 5-2. Main grid sensor installation surface, 6. Guide rod, 7. Sliding bearing, 7-1. Linear bearing, 7-2. Ball eye bearing, 8. Probe, 9. Pull cap. Detailed implementation manners

[0033] The following further illustrates the present utility model in conjunction with embodiments, but the present utility model is not limited to these embodiments.

[0034] Embodiment 1

[0035] As shown in the Figures 1-3 drawing, a scale structure in this embodiment includes a dial housing 1, a front bushing 2, a rear bushing 3, a measuring rod 4, a main grid base 5, a guide rod 6, a sliding bearing 7, a probe 8, and a pull cap 9. In the embodiment, the dial housing 1 is a hollow cylindrical shape, and the front bushing 2 and the rear bushing 3 are relatively installed at the front and rear ends of the dial housing 1. The front bushing 2 and the rear bushing 3 are in tapered surface fit with the entire section of the dial housing 1, and the tapered surface fit is a tapered thread fit. The dial housing 1 is provided with an internal tapered thread, and the front bushing 2 and the rear bushing 3 are provided with external tapered threads that match the internal tapered thread. According to the self-centering characteristic of the tapered surface, the front bushing 2 and the rear bushing 3 are coaxial, and their axes are parallel and coincident with the axis of the dial housing, as shown in the Figure 2 drawing.

[0036] The measuring rod 4 slides along the channel formed by the front bushing 2, the dial housing 1, and the rear bushing 3, and is reset by a tension spring (not shown) connecting the measuring rod 4 and the inner wall of the dial housing 1. The probe 8 and the pull cap 9 are respectively installed at the front and rear ends of the measuring rod 4. Bearing positioning holes are opened at the outer ends of the front bushing 2 and the rear bushing 3, and the bearing positioning holes of the front bushing 2 and the rear bushing 3 are respectively pressed into the sliding bearing 7 to form a front bushing assembly and a rear bushing assembly. The sliding bearing 7 adopts a linear bearing 7-1 or a ball eye bearing 7-2. The sliding bearing 7 can improve the axial sliding performance of the measuring rod 4, improve the measurement efficiency, and reduce the wear of the measuring rod.

[0037] The main grid base 5 is located inside the dial housing 1 and is fixedly connected to the measuring rod 4 by a threaded fastener. The main grid base 5 is provided with a U-shaped assembly groove 5-1 that fits and sleeves with the measuring rod 4, and the groove plane of the U-shaped assembly groove 5-1 serves as the main grid sensor installation surface 5-2. A sensor installation groove 1-1 is opened on the side wall of the dial housing 1, and the groove plane of the sensor installation groove 1-1 serves as the sub-grid sensor installation surface 1-2 and is parallel to the axis of the dial housing 1. Then, similarly, the sub-grid sensor installation surface 1-2 is parallel to the measuring rod 4. In this embodiment, the sensor installation groove 1-1 is a stepped groove, and the top stepped plane thereof is set as the sub-grid sensor installation surface 1-2.

[0038] As shown in the Figure 2As shown in the figure, a guide rod 6 along the axis direction of the dial gauge 1 is installed on the inner wall of the main grid base 5, and a sliding groove is provided on the main grid base 5 to be in sliding fit with the guide rod 6. The sliding groove and the installation surface 1-2 of the sub-grid sensor are arranged up and down opposite to each other. The main grid base 5 is in sliding fit with the guide rod 6, which can slide-guide the measuring rod 4 and prevent the measuring rod 4 from rotating at the same time, improving the measurement accuracy and stability.

[0039] In this embodiment, during assembly, the front bushing assembly, the rear bushing assembly and the dial gauge 1 are connected by taper threads to achieve taper surface mating connection. Utilizing the self-centering characteristic of the taper threads, the required coaxiality requirement between the front bushing and the rear bushing of the dial indicator and the parallel requirement between the measuring rod and the installation surface of the sub-grid sensor can be ensured during assembly. When the measuring head 8 measures an object, the measuring rod 4 slides inside the front bushing assembly and the rear bushing assembly; during the movement of the measuring rod 4, it drives the main grid base 5 to axially move inside the dial gauge 1. The main grid base 5 is in sliding groove fit with the guide rod 6, so that the measuring rod 4 will not deflect when driving the main grid base 5 to move, ensuring that the main grid base 5 is parallel to the installation surface 1-2 of the sub-grid sensor and guaranteeing the detection accuracy of the measuring rod 4.

[0040] Embodiment 2

[0041] As shown in the atta Figure 4 ched figure, the difference from Embodiment 1 is that the outer taper thread is provided on the dial gauge 1, and the inner taper threads matching with the outer taper thread are provided on the front bushing 2 and the rear bushing 3, that is, the components with the inner and outer taper threads in Embodiment 1 are swapped.

[0042] Embodiment 3

[0043] As shown in the atta Figure 5 ched figure, the difference from Embodiment 1 is that no thread is provided on the taper surface, an inner taper surface is provided on the dial gauge 1, and outer taper surfaces matching with the inner taper surface are provided on the front bushing 2 and the rear bushing 3. The front bushing 2 and the rear bushing 3 are installed in taper surface fit with the dial gauge 1 and fixed by threads, nails, pins, welding or glue.

[0044] Embodiment 4

[0045] As shown in the atta Figure 6 ched figure, the difference from Embodiment 3 is that an outer taper surface is provided on the dial gauge 1, and inner taper surfaces matching with the inner taper surface are provided on the front bushing 2 and the rear bushing 3, that is, the components with the inner and outer taper surfaces in Embodiment 3 are swapped.

[0046] Embodiment 5

[0047] As shown in the atta Figure 7 ched figure, the difference from Embodiment 3 is that the front bushing 2 and the rear bushing 3 are in two-stage fit with the dial gauge 1, one stage is straight thread fit and the other stage is taper surface fit. The dial gauge 1 is provided with a straight inner thread and an inner taper surface, and the front bushing 2 and the rear bushing 3 are provided with a straight outer thread and an outer taper surface matching with the dial gauge 1. The taper surface is located at the end of the bushing. Utilizing the locking force of the straight thread fit, this embodiment does not require fixing by threads, nails, pins, welding or glue.

[0048] Example 6

[0049] As shown in the Figure 8 accompanying drawings, the difference from Example 5 is that in the cooperation between the rear bushing 3 and the barrel 1, the cooperation sequence of the straight thread and the tapered surface with the barrel 1 is opposite to that in the cooperation between the front bushing 2 and the barrel 1. That is, the rear bushing 3 is provided with a straight external thread and an external tapered surface in sequence from front to back, the straight external thread is located at the end of the rear bushing 3, and the rear end of the barrel 1 is provided with a matching straight internal thread and an internal tapered surface.

[0050] Example 7

[0051] As shown in the Figure 9 accompanying drawings, the difference from Example 5 is that the barrel 1 is provided with a straight external thread and an external tapered surface, and the front bushing 2 and the rear bushing 3 are provided with straight internal threads and internal tapered surfaces that cooperate with the barrel 1, and the tapered surface is located at the end of the bushing. That is, the components where the internal and external straight threads and the internal and external tapered surfaces are arranged in Example 5 are swapped.

[0052] As shown in the Figure 10 accompanying drawings, Figure 10 (a) The sliding bearing 7 uses a linear bearing 7-1, Figure 10 (b) The sliding bearing 7 uses a spherical plain bearing 7-2.

[0053] As shown in the Figure 11 accompanying drawings, it is a schematic diagram of the cross-section of the barrel adopting a regular N-sided polygon structure. Figure 11 (a)- Figure 10 (e) successively represent that the cross-section of the barrel is a regular 3-8-sided polygon structure.

[0054] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations to these embodiments still fall within the protection scope of the present invention without departing from the principle and spirit of the present invention.

Claims

1. A scale structure, characterized in that: It includes a dial cylinder (1), a front shaft sleeve (2), a rear shaft sleeve (3), a measuring rod (4) and a main grating seat (5); the dial cylinder (1) is a hollow cylinder, the front shaft sleeve (2) and the rear shaft sleeve (3) are relatively installed at the front and rear ends of the dial cylinder (1), and at least one section of the mating surface between the front shaft sleeve (2), the rear shaft sleeve (3) and the dial cylinder (1) is a tapered surface fit. The measuring rod (4) slides along the channel formed by the front shaft sleeve (2), the dial cylinder (1) and the rear shaft sleeve (3), and the main grating seat (5) is located inside the dial cylinder (1) and fixedly connected to the measuring rod (4); a sensor installation groove (1-1) is provided on the side wall of the dial cylinder (1), and the groove plane of the sensor installation groove (1-1) serves as the secondary grating sensor installation surface (1-2) and is parallel to the axis of the dial cylinder (1).

2. The scale structure according to claim 1, wherein: The mating surfaces of the front shaft sleeve (2), the rear shaft sleeve (3) and the dial cylinder (1) are divided into two sections, which are tapered surface fit and straight thread fit respectively.

3. A scale structure according to claim 1 or 2, characterized in that: The tapered surface fit between the front shaft sleeve (2), the rear shaft sleeve (3) and the dial cylinder (1) is a tapered thread fit.

4. A scale structure according to claim 1, characterized in that: A guide rod (6) along the axis direction of the dial cylinder (1) is installed on the inner wall of the dial cylinder (1), and the main grating seat (5) is provided with a chute for sliding fit with the guide rod (6).

5. A scale structure according to claim 4, characterized in that: The main grating seat (5) is provided with a U-shaped assembly groove (5-1) for mating and sleeving with the measuring rod (4), and the groove plane of the U-shaped assembly groove (5-1) serves as the main grating sensor installation surface (5-2) and is parallel to the secondary grating sensor installation surface (1-2).

6. A scale structure according to claim 1, characterized in that: Bearing positioning holes are provided at the outer ends of the front shaft sleeve (2) and the rear shaft sleeve (3), and sliding bearings (7) are respectively pressed into the bearing positioning holes of the front shaft sleeve (2) and the rear shaft sleeve (3) to form a front shaft sleeve assembly and a rear shaft sleeve assembly.

7. A scale structure according to claim 6, characterized in that: The sliding bearing (7) adopts a linear bearing (7-1) or a fish-eye bearing (7-2).

8. A scale structure according to claim 1, characterized in that: The cross-section of the dial cylinder (1) is circular or a regular N-sided polygon, and N is a positive integer greater than or equal to 3.

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