A calibration tool and method for a non-contact measuring instrument for propellant dimensions

Abstract

This invention discloses a calibration tool and method for a non-contact propellant dimensional measuring instrument. The tool includes a base, slide rail, slider seat, pressure plate, instrument fixing components, and a standard block. During calibration, the measuring instrument is operated to illuminate the standard block with a laser projection point, obtaining the depth measurement step difference and radius measurement step difference. The measurement results are compared with standard values ​​to verify the calibration results. The calibration tool of this invention is designed with a detachable structure, and the overall tooling adopts a splicing structure to meet the positioning measurement requirements of a 5m length. The device is widely applicable and meets the requirements of visual measurement calibration.

Description

Technical Field

[0001] This invention relates to a calibration tool and method for a non-contact propellant size measuring instrument, belonging to the field of solid rocket engine propellant size measurement. Background Technology

[0002] Solid rocket motors are pyrotechnic devices, filled with flammable and explosive propellants. The internal pore dimensions of the propellant have strict design requirements. Currently, a mandrel-based demolding process is used for internal construction. However, due to the pyrotechnic nature of the propellant and the potential for measurement inaccuracies, manual measurement with rulers poses a safety hazard due to contact with the propellant surface. Using tape measures for depth measurement and micrometers for radius measurement also introduces human error and quality concerns. Therefore, a non-contact laser positioning and measuring instrument is designed to perform non-contact propellant positioning and measurement, resolving safety and quality concerns. Dimensional measurements must be accompanied by appropriate calibration tools to calibrate the instrument's depth and radius parameters. According to metrological instrument verification regulations, the verification of measurement data should employ standard data transfer methods, achieving verification of measurement parameters through data benchmark transfer. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a calibration tool for a non-contact measuring instrument for propellant size, which calibrates and verifies the depth and radius measurement results of the calibrated instrument and supplements the accuracy of the measuring instrument.

[0004] The technical solution of the present invention is: a calibration tool for a non-contact measuring instrument for propellant size, comprising: a base, a slide rail, a slider seat, a pressure plate, an instrument fixing component, and a calibration block;

[0005] The base is made of metal with a square groove in the middle and multiple through holes at the bottom for mounting an adjustable bracket; the top end face has threaded holes for mounting a pressure plate.

[0006] The slide rail has a trapezoidal structure with a square protrusion at the bottom. The protrusion is positioned in conjunction with the groove in the base. A square through hole is cut into the slide rail protrusion for fixing and installing the pressure plate.

[0007] The slider seat is a square structure with an internal groove. The slider seat is locked onto the slide rail and is limited by the slide rail through the groove. The upper end face of the slider seat has a positioning threaded hole for connecting with the inspection block.

[0008] The pressure plate is a sheet-like elliptical structure with through holes at both ends. Screws are used to fasten the pressure plate through these through holes, thereby securing the slide rail to the base.

[0009] The instrument fixture has a T-shaped structure with circular through holes at both the top and bottom. The lower through hole mates with the threaded hole on the end face of the base, and the instrument fixture is fixed to the base with bolts. The upper circular through hole is connected to the measuring instrument and used to fix the measuring instrument.

[0010] The bottom of the calibration block has a through hole. Bolts are used to connect the calibration block to the slider seat through the through hole. The two form a calibration standard assembly, which realizes the sliding adjustment of the measurement depth. The measuring instrument is operated to irradiate the calibration block with the laser projection point to obtain the depth measurement step difference and the radius measurement step difference. The above measurement results are compared with the standard values ​​to verify the calibration results.

[0011] The length of the base groove is greater than the length of the slide rail protrusion, ensuring the connection gap of the splicing structure.

[0012] The pressure plate is a metal structure, and its external dimensions are consistent with the square through holes of the slide rail.

[0013] The slide rail has a triangular wedge-shaped structure, and the slider seat has a square structure with an internal through groove that is the same shape as the triangular wedge of the slide rail. The triangular wedge structure is used to fit and limit the movement of the slide rail and the slider seat.

[0014] It also includes connectors; threaded holes are drilled on the front and back edges of both sides of the base, and the connectors pass through the square through holes of the slide rail and are fastened to the upper surface of the base by bolts, thereby extending the base.

[0015] The connector is an L-shaped metal component, which is installed on the side plane of two adjacent sets of bases respectively. The symmetrically installed connectors are fastened with bolts and nuts to extend the base.

[0016] The calibration block is designed as a multi-planar tree-shaped metal structure. All reference planes are designed to be vertical. The front and rear parts are designed as vertically parallel A and B stepped planes, and the upper and lower parts are designed as horizontally parallel C and D stepped planes. The distances between planes A-B and C-D are standard values. During calibration, the measuring instrument is operated to adjust the laser projection point to the vertically parallel A and B stepped planes of the calibration block to obtain depth measurement results a and b. a-b is the depth measurement step difference. The laser projection point is then adjusted to the horizontally parallel C and D stepped planes of the calibration block to obtain depth measurement results c and d. c-d is the radius measurement step difference. The measurement results are compared with the standard values ​​to verify the calibration results.

[0017] A method for calibrating a non-contact propellant size measuring instrument using the aforementioned tool, comprising:

[0018] The drug size measuring instrument is fixed to the calibration tool through the through holes on both sides of the instrument fixing part;

[0019] The laser projection point is adjusted to the vertically parallel A and B step planes of the standard block using the measuring instrument to obtain depth measurement results a and b. a-b is the depth measurement step difference. The laser projection point is then adjusted to the horizontally parallel C and D step planes of the standard block to obtain depth measurement results c and d. c-d is the radius measurement step difference. The measurement results are compared with the standard value to verify the calibration results.

[0020] The advantages of this invention compared to the prior art are:

[0021] 1. This invention designs two sets of standard reference surfaces. Measuring instruments measure the distance between the AB surfaces of the vertical stepped structure and the distance between the CD surfaces of the horizontal stepped structure. This satisfies the calibration requirements for both depth and radius parameters. The two distance parameters can be verified using high-precision measuring instruments or by obtaining a certificate of conformity from a metrology verification department to confirm the dimensional data. This completes the transfer and conversion of calibration data to instrument measurement data.

[0022] 2. The measuring instrument of this invention adopts the basic technology of laser ranging. Laser ranging has the characteristic that the accuracy decreases as the measurement distance increases. The measurement depth corresponds to the measurement distance. Generally, the measurement requirement is not less than 5 meters. This tool is designed with a splicing extension scheme to avoid the base being too large, which would cause difficulties in installation and transportation. At the same time, the splicing connection scheme can effectively avoid the difficulties of deformation of single tooling and poor guide rail.

[0023] 3. The tool of this invention is made of metal, allowing operators to directly set it up and verify it on-site. Furthermore, the tool is designed with connecting components for easy disassembly and relocation, supporting manual lifting and moving for convenience and speed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a structural diagram of the base, in which, Figure 2 'a' is a bottom view. Figure 2 b is the front view. Figure 2 c is the top view. Figure 2 d is a side view;

[0026] Figure 3 This is a structural diagram of the slide rail, in which, Figure 3 'a' is the main view. Figure 3 b is a side view;

[0027] Figure 4 This is a schematic diagram of the slider seat, in which, Figure 4 'a' is the main view. Figure 4 b is the bottom view. Figure 4 c is the side view;

[0028] Figure 5 This is a structural diagram of the pressure plate, in which, Figure 5 a. Main view Figure 5 b is a side view;

[0029] Figure 6 This is a structural diagram of the connector, in which, Figure 6 'a' is the main view. Figure 6 b. Top view, Figure 6 c is the side view;

[0030] Figure 7 This is a structural diagram of the instrument's fixing components, in which, Figure 7 a. Main view Figure 7 b is a side view;

[0031] Figure 8 This is a schematic diagram of the structure of the inspection block, in which, Figure 8 'a' is the main view. Figure 8 b. Side view Figure 8 c is the top view. Detailed Implementation

[0032] like Figure 1 As shown, the present invention relates to a non-contact measuring instrument calibration tool, which includes: a base 1, a slide rail 2, a slider seat 3, a pressure plate 4, a connector 5, an instrument fixing component 6, and a calibration block 7.

[0033] like Figure 2 As shown, the base is a metal structure with a square groove in the middle and multiple through holes at the bottom for mounting an adjustable bracket; the top end face has threaded holes for mounting a pressure plate.

[0034] like Figure 3 As shown, the slide rail has a trapezoidal structure with a square protrusion at the bottom, which is positioned to fit into the groove of the base; a square through hole is cut into the slide rail protrusion for fixing and installing the pressure plate.

[0035] like Figure 4 As shown, the slider seat has a square structure with a groove inside. The slider seat is locked onto the slide rail and is limited by the groove. The upper end face of the slider seat has a positioning threaded hole for connecting with the inspection block.

[0036] like Figure 5 As shown, the pressure plate is a sheet-like elliptical structure with through holes at both ends. Screws are used to fasten the pressure plate through these through holes, thereby securing the slide rail to the base.

[0037] like Figure 7As shown, the instrument fixing component has a T-shaped structure with circular through holes at both the upper and lower ends. The lower through hole mates with the threaded hole on the end face of the base, and the instrument fixing component is fixed to the base by bolts. The upper circular through hole is connected to the measuring instrument and used to fix the measuring instrument.

[0038] like Figure 8 As shown, the bottom of the calibration block has a through hole. Bolts are used to connect the calibration block and the slider seat through the through hole. The two constitute a calibration standard assembly to achieve sliding adjustment of the measurement depth. The measuring instrument is operated to irradiate the calibration block with the laser projection point to obtain the depth measurement step difference and the radius measurement step difference. The above measurement results are compared with the standard values ​​to verify the calibration results.

[0039] The length of the base groove is greater than the length of the slide rail protrusion, ensuring the connection gap of the splicing structure.

[0040] The pressure plate is a metal structure, and its external dimensions are consistent with the square through holes of the slide rail.

[0041] The slide rail has a triangular wedge-shaped structure, and the slider seat has a square structure with an internal through groove that is the same shape as the triangular wedge of the slide rail. The triangular wedge structure is used to fit and limit the movement of the slide rail and the slider seat.

[0042] like Figure 6 As shown, it also includes a connector; threaded holes are drilled on the front and rear edges of both sides of the base, and the connector passes through the square through hole of the slide rail and is fastened to the upper surface of the base by bolts to extend the base.

[0043] The connector is an L-shaped metal component, which is installed on the side plane of two adjacent sets of bases respectively. The symmetrically installed connectors are fastened with bolts and nuts to extend the base.

[0044] The calibration block is designed as a multi-planar tree-shaped metal structure. All reference planes are designed to be vertical. The front and rear parts are designed as vertically parallel A and B stepped planes, and the upper and lower parts are designed as horizontally parallel C and D stepped planes. The distances between planes A-B and C-D are standard values. During calibration, the measuring instrument is operated to adjust the laser projection point to the vertically parallel A and B stepped planes of the calibration block to obtain depth measurement results a and b. a-b is the depth measurement step difference. The laser projection point is then adjusted to the horizontally parallel C and D stepped planes of the calibration block to obtain depth measurement results c and d. c-d is the radius measurement step difference. The measurement results are compared with the standard values ​​to verify the calibration results.

[0045] The present invention also relates to a method for calibrating a non-contact propellant size measuring instrument using the aforementioned tool, comprising:

[0046] The drug size measuring instrument is fixed to the calibration tool through the through holes on both sides of the instrument fixing part;

[0047] The laser projection point is adjusted to the vertically parallel A and B step planes of the standard block using the measuring instrument to obtain depth measurement results a and b. a-b is the depth measurement step difference. The laser projection point is then adjusted to the horizontally parallel C and D step planes of the standard block to obtain depth measurement results c and d. c-d is the radius measurement step difference. The measurement results are compared with the standard value to verify the calibration results.

[0048] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention based on the above-disclosed technical content without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A calibration tool for a propellant size non-contact measuring instrument, characterized in that, It comprises: Base, slide rail, slider seat, pressing plate, instrument fixing part, standard detection block; The base is a metal structure, a square groove is arranged in the middle position, and a plurality of through holes are arranged at the bottom for mounting the height-adjustable support; a threaded hole is dug in the top end face for mounting the pressing plate; The slide rail is a trapezoidal structure, a square protrusion is designed at the bottom, and the protrusion part is positioned with the groove of the base; a square through hole is dug on the protrusion of the slide rail for fixing and mounting the pressing plate; The slider seat is a square block structure, a groove is designed inside, the slider seat is clamped on the slide rail through the groove and limited with the slide rail; a positioning threaded hole is dug in the upper end face of the slider seat for connecting with the standard detection block; The pressing plate is a sheet-shaped elliptical structure, through holes are designed at both ends, and the pressing plate is fastened through the through holes by screws, so that the slide rail is fastened on the base; The instrument fixing part is a T-shaped structure, circular through holes are arranged at the upper end and the lower end, the lower end through hole is matched with the end face threaded hole on the base, and the instrument fixing part is fixed on the base by bolts; the upper end circular through hole is connected with the measuring instrument for fixing the measuring instrument; The bottom of the standard detection block is designed with a through hole, and the standard detection block is connected with the slider seat through the through hole by bolts, and the two constitute a standard detection block assembly to realize sliding adjustment of the depth measurement; the measuring instrument is controlled, the laser projection point is irradiated to the standard detection block, the depth measurement step difference and the radius measurement step difference are obtained, and the measurement results are compared with the standard value to verify the calibration result; The length dimension of the groove of the base is greater than the length of the protrusion of the slide rail, and the connection gap of the splicing structure is ensured; The pressing plate is a metal structure, and the outer dimension is consistent with the square through hole of the slide rail; The slide rail is a triangular wedge structure, and the slider seat is a square structure with an internal through groove with the same shape as the triangular wedge structure of the slide rail, and the slide rail and the slider seat are limited by the triangular wedge structure; It also includes a connecting piece; threaded holes are dug in the front and rear edge parts of the end faces of the two sides of the base, the connecting piece passes through the square through hole of the slide rail, and is fastened by bolts and threaded connection with the upper surface of the base to realize the extension of the base; The connecting piece is an L-shaped metal piece, which is installed on the side planes of two adjacent groups of bases respectively, and the symmetrically installed connecting pieces realize the extension of the base by bolt and nut fastening; The standard detection block is designed as a multi-plane tree-shaped metal structure, the reference planes are all designed as vertical, the front and rear parts are designed as vertical parallel A and B step planes, and the upper and lower parts are designed as horizontal parallel C and D step planes, wherein the distances between A-B and C-D planes are standard values; during calibration, the laser projection point is adjusted to the vertical parallel A and B step planes of the standard detection block respectively by controlling the measuring instrument, the depth measurement results a and b are obtained, and a-b is the depth measurement step difference; the laser projection point is adjusted to the horizontal parallel C and D step planes of the standard detection block respectively, the depth measurement results c and d are obtained, and c-d is the radius measurement step difference; the measurement results are compared with the standard value to verify the calibration result.

2. A method for calibrating a non-contact propellant dimension measuring instrument using the tool of claim 1, characterized in that, It comprises: The caliper is fixed on the calibration tool through the through holes on both sides of the instrument fixing part; The laser projection points are adjusted to the A and B step planes of the vertical parallel calibration block by operating the measuring instrument, and the depth measurement results a and b are obtained, and a-b is the depth measurement step difference; the laser projection points are adjusted to the C and D step planes of the horizontal parallel calibration block, and the depth measurement results c and d are obtained, and c-d is the radius measurement step difference, and the measurement results are compared with the standard values to verify the calibration results.

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