Measuring device for major and minor diameters of screws

Abstract

The present application provides a device for measuring the major diameter and minor diameter of a screw, comprising a micrometer having a first measuring end and a second measuring end; a minor diameter measuring assembly comprising a first reference member and a first measuring member, wherein the first reference member and the first measuring member are respectively fixed to the first measuring end and the second measuring end when in use; and a major diameter measuring assembly comprising a second reference member, wherein the second reference member is fixed to the first measuring end when in use. The present application provides a device for measuring the major diameter and minor diameter of a screw, which can accurately find the spiral peaks and spiral valleys of the spiral surface of a screw pump rotor through point-to-surface and point-to-line contact, thereby accurately measuring the major diameter and minor diameter data, thereby solving the problem in the prior art that the size of a screw pump rotor is difficult to accurately measure.

Description

Technical Field

[0001] The present application relates to the technical field of dimension measuring tools, and in particular to a device for measuring the major diameter and minor diameter of a screw. Background Art

[0002] The interference (or gap) between the stator and rotor of the screw pump, as well as the machining accuracy of the rotor, directly affect the working performance of the screw pump. A small interference will increase the amount of liquid leakage, reduce the volumetric efficiency, and reduce the flow and pressure of the screw pump, that is, reduce the energy efficiency of the screw pump. A large interference will increase the friction resistance between the stator and rotor, resulting in increased power consumption, reduced energy efficiency, and even pump jam. If the rotor processing size is uneven, it is likely to cause the rotor and stator to lock, the stator rubber to tear, and other phenomena. These phenomena seriously affect the normal operation and service life of the screw pump, so measuring the size of the screw pump rotor is a necessary process before the screw pump leaves the factory.

[0003] Since the outer surface of the screw pump's rotor is a single spiral surface, when a conventional vernier caliper is used to measure the screw pump's rotor, the measurement error is large due to the structural limitations of the vernier caliper, and the major and minor diameters of the rotor cannot be accurately measured, which is not conducive to ensuring the factory quality of the screw pump.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a device for measuring the major diameter and minor diameter of a screw rod, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solution: a device for measuring the major diameter and minor diameter of a screw, comprising:

[0007] a micrometer having a first measuring end and a second measuring end;

[0008] The minor diameter measuring assembly comprises a first reference member and a first measuring member, wherein the first reference member and the first measuring member are respectively fixed to the first measuring end and the second measuring end when in use, the first reference member has a first reference surface, the length of the first reference surface is greater than twice the pitch of the screw, the first reference surface is used to abut against at least three screw crests, the first measuring member has a measuring blade, the measuring blade is inserted into the screw valley, and the distance between the measuring blade and the first reference surface is the minor diameter of the screw;

[0009] A major diameter measuring assembly comprises a second reference member, which is fixed to the first measuring end when in use, and has a second reference surface, the length of which is greater than the pitch of the screw, and the second reference surface is used to abut against at least two screw crests, the end surface of the second measuring end abuts against the screw crest on the opposite side, and the distance between the second reference surface and the end surface of the second measuring end is the major diameter of the screw.

[0010] The second measuring end comprises a second measuring end body and a second measuring end accessory, the second measuring end accessory is fixed on the second measuring end body, the second measuring end accessory is used in conjunction with the second reference member, the second measuring end accessory has a measuring surface, and when the second measuring end accessory is in use, the end surface of the second measuring end is formed by the measuring surface;

[0011] The second measuring end fitting is disc-shaped, and a cross section of the second measuring end fitting is larger than a cross section of the second measuring end body.

[0012] The first measuring member further comprises a first sliding block, and the second measuring end body is provided with a sliding groove, the extending direction of the sliding groove is parallel to the length direction of the first reference member and is along the radial direction of the second measuring end body;

[0013] The first sliding block is slidably matched with the sliding groove, and the measuring blade is fixed on the sliding block.

[0014] The second measuring end accessory is provided with a second slider, the second slider is slidably matched with the slide groove, and the second measuring end accessory is fixed to the second measuring end body through the second slider.

[0015] The slide groove is a T-shaped groove, and the first slider and the second slider are both T-shaped sliders.

[0016] The first measuring end is formed by the fixed end of the micrometer, and the second measuring end body is formed by the movable end of the micrometer. The movable end is fixed on the screw nut mechanism of the micrometer, and a screw locking mechanism is provided on the micrometer corresponding to the screw nut mechanism.

[0017] Compared with the closest prior art, the technical solution of the embodiment of the present application has the following beneficial effects:

[0018] (1) The present invention provides a device for measuring the major diameter and minor diameter of a screw, which can accurately find the spiral peaks and spiral valleys of the spiral surface of a screw pump rotor through point-to-surface and point-to-line contact, thereby accurately measuring the major diameter and minor diameter data, thereby solving the problem in the prior art that the screw pump rotor size is difficult to accurately measure.

[0019] (2) A second measuring end accessory with a larger cross-section is provided to reduce the difficulty of aligning the second measuring end with the screw peak, thereby further improving the measurement accuracy of the rotor major diameter.

[0020] (3) The measuring blade can move along the extension direction of the slide groove to achieve self-centering of the measuring blade with respect to the screw valley, thereby reducing the difficulty of operation and further improving the test accuracy.

[0021] (4) The connection between the second measuring end accessory and the second measuring end body utilizes a slide groove, which has a simple structure and is easy to process and install.

[0022] (5) The T-shaped slide groove and the T-shaped slider can prevent the slider from falling out of the slide groove, making it easier to use and operate the measuring device.

[0023] (6) The screw locking mechanism facilitates the operation of the large and small diameter measuring devices of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0025] Figure 1 The structure diagram of a specific embodiment of a device for measuring the major diameter and minor diameter of a screw is shown in FIG. Figure 1 ;

[0026] Figure 2 The structure diagram of a specific embodiment of a device for measuring the major diameter and minor diameter of a screw is shown in FIG. Figure 2 ;

[0027] Figure 3 The structure diagram of a specific embodiment of a device for measuring the major diameter and minor diameter of a screw is shown in FIG. Figure 3 ;

[0028] Figure 4 The structure diagram of a specific embodiment of a device for measuring the major diameter and minor diameter of a screw is shown in FIG. Figure 4 ;

[0029] Figure 5 yes Figure 1 and Figure 2 Usage status diagram;

[0030] Figure 6 yes Figure 3 and Figure 4 Usage status diagram;

[0031] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0032] Description of reference numerals:

[0033] 1. Micrometer; 2. First measuring end; 3. Second measuring end body; 4. Second measuring end accessories; 5. Second reference piece; 6. Second reference surface; 7. Screw locking device; 8. Screw; 9. First slider; 10. Measuring blade; 11. First reference piece; 12. First reference surface; 13. Second slider. DETAILED DESCRIPTION

[0034] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present application includes such modifications and variations within the scope of the appended claims and their equivalents.

[0035] In the description of the present application, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and do not require that the present application must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application. The terms "connected", "connected", and "set" used in the present application should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] The present application provides a device for measuring the major diameter and minor diameter of a screw. Figures 1 to 7 As shown, the device for measuring the major diameter and minor diameter of the screw comprises a micrometer 1, a minor diameter measuring assembly and a major diameter measuring assembly.

[0037] The micrometer 1 has a first measuring end 2 and a second measuring end, wherein the second measuring end includes a second measuring end body 3 and a second measuring end fitting 4, and the second measuring end fitting 4 is fixed on the second measuring end body 3: the second measuring end body 3 is provided with a slide groove, the extension direction of the slide groove is parallel to the length direction of the second reference member 5 and is along the radial direction of the second measuring end body 3, the second measuring end fitting 4 is provided with a second slider 13, the second slider 13 is slidably matched with the slide groove, and the second measuring end fitting 4 is fixed to the second measuring end body 3 through the second slider 13. The second measuring end fitting 4 is disc-shaped, and the cross section of the second measuring end fitting 4 is larger than the cross section of the second measuring end body 3. The second measuring end fitting 4 is used in conjunction with the second reference member 5, and the second measuring end fitting 4 has a measuring surface, and when the second measuring end fitting 4 is in use, the end surface of the second measuring end is formed by the measuring surface. The large diameter measuring assembly includes a second reference part 5, which is fixed to the first measuring end 2 when in use. The second reference part 5 has a second reference surface 6. The length of the second reference surface 6 is greater than the pitch of the screw 8. The second reference surface 6 is used to abut against at least two screw peaks. The end face of the second measuring end (in this case, the measuring face of the second measuring end accessory 4) abuts against the screw peak on the opposite side. The distance between the second reference surface 6 and the end face of the second measuring end is the large diameter of the screw 8.

[0038] The minor diameter measuring assembly includes a first reference member 11 and a first measuring member. When in use, the first reference member 11 and the first measuring member are fixed to the first measuring end 2 and the second measuring end, respectively. The first reference member 11 has a first reference surface 12. The length of the first reference surface 12 is greater than twice the pitch of the screw 8. The first reference surface 12 is used to abut against at least three screw peaks. The first measuring member has a measuring blade 10 and a first slider 9. The first slider 9 is slidably matched with the slideway, and the measuring blade 10 is fixed on the first slider 9. The measuring blade 10 can move along the extension direction of the slideway. When the measuring blade 10 clamps the spiral surface, it can be automatically centered so that the measuring blade 10 is inserted into the screw valley to accurately clamp the screw valley of the screw 8. The distance between the measuring blade 10 and the second reference surface is the minor diameter of the screw 8. In this embodiment, the slideway is a T-shaped slot, and the first slider 9 and the second slider 13 are both T-shaped sliders.

[0039] The first measuring end 2 is formed by the fixed end of the micrometer 1, and the second measuring end body 3 is formed by the movable end of the micrometer 1. The movable end is fixed on the screw nut mechanism of the micrometer 1, and a screw locking mechanism 7 is provided on the micrometer 1 corresponding to the screw nut mechanism.

[0040] The method for measuring the major diameter of the screw 8 of a single screw pump is as follows: Before measuring the screw 8, the outer surface of the screw 8 of the screw pump to be tested needs to be wiped clean to prevent iron filings and impurities from adhering to the outer surface and affecting the test results.

[0041] Use micrometer 1 and major diameter measuring assembly (necessary routine operations such as micrometer zero calibration and usage are not described here), place the second reference part 5 flatly under the screw 8, so that the second reference surface 6 is against the two screw peaks, and the second measuring end accessory 4 is directly above the screw peaks on the opposite side, adjust the micrometer 1 until the measuring surface is against the screw peaks, the major diameter of the screw 8 can be read by the micrometer 1, and the average major diameter can be calculated through multiple measurements.

[0042] The method for measuring the minor diameter of the screw 8 of a single screw pump is as follows: Before measuring the screw 8, the outer surface of the screw 8 of the screw pump to be tested must be wiped clean to prevent iron filings and impurities from adhering to the outer surface and affecting the test results.

[0043] Use the minor diameter measuring assembly and micrometer 1 (necessary routine operations such as micrometer zero calibration and usage are not repeated here), place the first reference piece 11 flatly under the screw 8, make the first reference surface 12 touch the three screw peaks, and the measuring blade 10 is near the top of the opposite screw valley, adjust the micrometer 1 until the measuring blade 10 contacts the screw 8. Since the surface of the screw 8 of the screw pump is relatively smooth, under a certain clamping force and the combined force of the reaction force of the spiral surface, the measuring blade 10 can move along the extension direction of the slide groove by itself. Keep adjusting the micrometer 1 until the measuring blade 10 moves to the screw valley. The minor diameter size of the screw 8 can be read by the micrometer 1, and the average value of the minor diameter can be calculated through multiple measurements.

[0044] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for measuring the major and minor diameters of a screw, characterized in that: include a micrometer having a first measuring end and a second measuring end; The minor diameter measuring assembly comprises a first reference member and a first measuring member, wherein the first reference member and the first measuring member are respectively fixed to the first measuring end and the second measuring end when in use, the first reference member has a first reference surface, the length of the first reference surface is greater than twice the pitch of the screw, the first reference surface is used to abut against at least three screw crests, the first measuring member has a measuring blade, the measuring blade is inserted into the screw valley, and the distance between the measuring blade and the first reference surface is the minor diameter of the screw; A major diameter measuring assembly, comprising a second reference member, which is fixed to the first measuring end when in use, and has a second reference surface, the length of which is greater than the pitch of the screw, and the second reference surface is used to abut against at least two screw crests, the end surface of the second measuring end abuts against the screw crest on the opposite side, and the distance between the second reference surface and the end surface of the second measuring end is the major diameter of the screw; The second measuring end comprises a second measuring end body and a second measuring end accessory, the second measuring end accessory is fixed on the second measuring end body, the second measuring end accessory is used in conjunction with the second reference member, the second measuring end accessory has a measuring surface, and when the second measuring end accessory is in use, the end surface of the second measuring end is formed by the measuring surface; The second measuring end fitting is in a disc shape, and the cross section of the second measuring end fitting is larger than the cross section of the second measuring end body; The first measuring member further comprises a first sliding block, and the second measuring end body is provided with a sliding groove, the extending direction of the sliding groove is parallel to the length direction of the first reference member and is along the radial direction of the second measuring end body; The first slider is slidably matched with the slide groove, and the measuring blade is fixed on the slider; The second measuring end accessory is provided with a second slider, the second slider is slidably matched with the slide groove, and the second measuring end accessory is fixed to the second measuring end body through the second slider; The slide groove is a T-shaped groove, and the first slider and the second slider are both T-shaped sliders; The first measuring end is formed by the fixed end of the micrometer, and the second measuring end body is formed by the movable end of the micrometer. The movable end is fixed on the screw nut mechanism of the micrometer, and a screw locking mechanism is provided on the micrometer corresponding to the screw nut mechanism.

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