CN-224231607-U - Calibration fixture for optical filter for building material smoke density tester

CN224231607UCN 224231607 UCN224231607 UCN 224231607UCN-224231607-U

Abstract

The invention relates to a calibration clamp for an optical filter for a building material smoke density tester, which comprises a lifting table, a left translation table, a right translation table and a clamping unit, wherein the lifting table is used for driving the left translation table and the right translation table to vertically move up and down, the left translation table and the right translation table are used for driving the clamping unit to horizontally translate, the clamping unit comprises a self-centering chuck and a sample placing seat, the sample placing seat is used for horizontally placing the optical filter, the self-centering chuck is used for clamping the optical filter placed on the sample placing seat or placing the optical filter clamped by the self-centering chuck on the sample placing seat when the self-centering chuck is turned to a horizontal state, the self-centering chuck clamps the optical filter and enables the optical filter to be in a vertical state when the self-centering chuck is turned to a vertical state, and the self-centering chuck is kept in the horizontal state or the vertical state through a limiting structure. The technical scheme can adapt to the clamping of the optical filters with different diameters and different thicknesses, and is convenient for adjusting the position so as to measure the uniformity of the optical filters.

Inventors

QIU DAIJUN
HE YUNXIN
LIU YUANYUAN
CHENG KANG
SUI FENG
FENG ZHONGBIN
WU XIN
MIAO CHUNYUAN

Assignees

山东省计量科学研究院

Dates

Publication Date: 20260512
Application Date: 20250530

Claims (10)

1. A calibration clamp for an optical filter for a building material smoke density tester is characterized by comprising a lifting table (1), a left translation table (2) and a clamping unit, wherein the lifting table (1) is used for driving the left translation table (2) and the right translation table (2) to vertically move up and down, the left translation table (2) and the right translation table (2) are used for driving the clamping unit to horizontally translate, the clamping unit comprises a self-centering chuck (4) and a sample placing seat (5), the sample placing seat (5) is used for horizontally placing the optical filter, the self-centering chuck (4) is used for clamping the optical filter, the self-centering chuck (4) is rotationally connected with the left translation table (2), when the self-centering chuck (4) is turned to a horizontal state, the optical filter placed on the sample placing seat (5) is clamped by the self-centering chuck (4) or the optical filter clamped by the self-centering chuck is placed on the sample placing seat (5), when the self-centering chuck (4) is turned to the vertical state, the self-centering chuck (4) clamps the optical filter and enables the optical filter to be in the vertical state, and the self-centering chuck (4) is kept in the horizontal state or the vertical state through a limiting structure.
2. The calibration fixture for the optical filter for the building material smoke density tester according to claim 1, wherein the self-centering chuck (4) comprises a fixed ring (401) and a rotating ring (415), the fixed ring (401) is rotationally connected with the left translation table (2) and the right translation table (2), the rotating ring (415) is coaxially rotationally connected with the fixed ring (401), n shafts A (403) are uniformly and circumferentially fixed on the fixed ring (401), n sleeves (404) are uniformly and circumferentially rotationally arranged on the rotating ring (415), n=3 or n=4 are arranged, each sleeve (404) is correspondingly and slidingly connected with 1 swinging rod (402), one end of the swinging rod (402) is hinged with the shaft A (403), the other end of the swinging rod (402) is rotationally provided with a roller (406), the n rollers (406) are used for self-centering and the rotating driving mechanism is used for driving the rotating ring (415) to rotate relative to the fixed ring (401).
3. The calibration fixture for the optical filter for the building material smoke density tester according to claim 2, wherein the rotation driving mechanism is characterized in that a hinge lug (410) is fixedly arranged on the outer edge of a rotation ring (415), a nut B (409) is rotatably connected with the hinge lug (410), a shaft C (413) is fixedly arranged on the fixing ring (401), a rotation seat (412) is rotatably connected with the shaft C (413), a screw rod B (411) is rotatably connected with the rotation seat (412), the screw rod B (411) is in threaded connection with the nut B (409), and an elastic knob (414) is fixedly arranged at the end part of the screw rod B (411).
4. The calibration jig for a filter for a building material smoke density meter according to claim 2, wherein the outer surface of the roller (406) is made of rubber.
5. The calibration fixture for the optical filter for the building material smoke density tester according to claim 2, wherein the limiting structure comprises a fixed seat (3) and a supporting block (6) which are fixed on a left translation table and a right translation table (2), when the self-centering chuck (4) is overturned to be abutted against the supporting block (6), the self-centering chuck (4) is in a horizontal state, a plurality of magnets (302) are fixedly arranged on one side, facing the self-centering chuck (4), of the fixed seat (3), and when the self-centering chuck (4) is overturned to be attracted to the magnets (302), the self-centering chuck (4) is in a vertical state.
6. The calibration fixture for the optical filter for the building material smoke density analyzer according to claim 2, wherein the bottom of the fixing ring (401) is fixedly provided with a supporting leg (407), the supporting leg (407) is provided with a hole D (408), a shaft D (7) is fixedly penetrated into the hole D (408), the shaft D (7) is rotationally connected with a shaft seat (8) through a rolling bearing, and the shaft seat (8) is fixed on the left-right translation table (2).
7. The calibration fixture for the optical filter for the building material smoke density tester according to claim 1, wherein the lifting table (1) comprises a lifting table top (101), the left and right translation tables (2) comprise a translation table top (202), a pointer (9) is fixedly arranged on the lifting table top (101), a scale (10) is arranged on the translation table top (202), and the pointer (9) is used for indicating the scale (10).
8. The fixture for calibrating an optical filter for a building material smoke density measuring instrument according to claim 7, wherein the lifting table (1) is a manual scissor type lifting table.
9. The calibration fixture for the optical filter for the building material smoke density analyzer according to claim 7, wherein the left translation table (2) and the right translation table (2) further comprise a screw rod A (205) and a nut A (201) which are mutually matched and screwed, two ends of the screw rod A (205) are respectively in rolling connection with a bearing seat (206) through rolling bearings, the bearing seat (206) is fixedly connected with the lifting table top (101), a translation knob (207) is fixedly arranged at the end part of the screw rod A (205), the nut A (201) is fixedly connected with the translation table top (202), and the translation table top (202) is in sliding connection with the lifting table top (101) through a linear guide structure.
10. The calibration fixture for the optical filter for the building material smoke density analyzer according to claim 9, wherein the linear guide structure comprises a sliding block (203) and a guide rail (204) which are in matched sliding connection, the guide rail (204) is fixedly connected with the lifting table top (101), and the sliding block (203) is fixedly connected with the translation table top (202).

Description

Calibration fixture for optical filter for building material smoke density tester Technical Field The invention belongs to the technical field of building fire control design measurement, and particularly relates to a calibration fixture for an optical filter for a building material smoke density tester. Background Smoke density is one of the core indexes of fire safety assessment, and is that when materials are burned or decomposed under specific test conditions, the greater the attenuation degree of smoke to light is, the stronger the blocking capability of the smoke to visible light is, and the higher the difficulty of escape and rescue in the fire is. The smoke density is tested by combining the type of materials, combustion conditions and industry standards. According to the national standard GB/T8627-2007 'method for testing the smoke density of combustion or decomposition of building materials', a light intensity attenuation method is used as a core measurement principle of the smoke density, a smoke density tester evaluates the size of the smoke density by measuring the loss of luminous flux caused by the reflection of solid dust in smoke generated by the combustion of materials on light, the smoke density value can be represented by a light absorption value Ds, and the relation between the light absorption rate and the light transmittance tau is Ds=1-tau, so that the measurement of the density of the building material combustion smoke can be converted into the measurement of the light absorption rate. The quantized smoke density can provide scientific basis for building fireproof design, material selection and emergency plan formulation. The filter is a standard device for calibrating the luminous flux of the building material smoke density tester, the measurement data of the smoke density is directly influenced by the filter fixed value result, and the measurement data of the smoke density is an important theoretical data for building fire control design, so that the calibration of the filter of the building material smoke density tester is a key step for ensuring the accuracy and the reliability of the measurement data, and a spectrophotometer is adopted during the calibration of the filter. The size and thickness specification of the optical filter equipped in the building material smoke density measuring instrument are all characterized in various ways, and the sample fixing clamp of the existing spectrophotometer is single, so that the uniformity of the optical filter is inconvenient to measure. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a calibration fixture for an optical filter for a building material smoke density tester. The technical scheme of the invention is as follows: A calibration clamp for an optical filter for a building material smoke density tester comprises a lifting table, a left translation table, a right translation table and a clamping unit, wherein the lifting table is used for driving the left translation table and the right translation table to vertically move up and down, the left translation table and the right translation table are used for driving the clamping unit to horizontally translate, the clamping unit comprises a self-centering chuck and a sample placing seat, the sample placing seat is used for horizontally placing the optical filter, the self-centering chuck is used for clamping the optical filter, the self-centering chuck is rotationally connected with the left translation table and the right translation table, when the self-centering chuck is turned to a horizontal state, the self-centering chuck clamps the optical filter placed on the sample placing seat or places the optical filter clamped by the self-centering chuck on the sample placing seat, when the self-centering chuck is turned to a vertical state, the self-centering chuck clamps the optical filter and enables the optical filter to be in the vertical state, and the self-centering chuck is kept in the horizontal state or the vertical state through a limiting structure. Further, the self-centering chuck comprises a fixed ring and a rotating ring, the fixed ring is rotationally connected with the left translation table and the right translation table, the rotating ring is coaxially rotationally connected with the fixed ring, n shafts A are uniformly and circumferentially fixed on the fixed ring, n sleeves are uniformly and circumferentially rotationally arranged on the rotating ring, n=3 or n=4, each sleeve is correspondingly and slidingly connected with 1 swinging rod, one end of the swinging rod is hinged with the shaft A, the other end of the swinging rod is rotationally provided with a roller, the n rollers are used for self-centering clamping the optical filter, and a rotation driving mechanism is used for driving the rotating ring to rotate relative to the fixed ring. The rotary driving mechanism comprises a