Calibration clamp of optical filter for building material smoke density tester

Abstract

The utility model relates to a calibration clamp of an optical filter for a building material smoke density tester. The calibration clamp comprises a lifting table, a left-right translation table and a clamping unit, the lifting table is used for driving the left-right translation table to vertically move; the left-right translation table is used for driving the clamping unit to translate left and right; the clamping unit comprises a self-centering chuck and a sample placing seat, the sample placing seat is used for horizontally placing an optical filter, the self-centering chuck is used for clamping the optical filter, and the self-centering chuck is rotationally connected with the left-right translation table; when the self-centering chuck is overturned 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 overturned to a vertical state, the self-centering chuck clamps the optical filter and enables the optical filter to be in a vertical state; and the self-centering chuck is kept in a horizontal state or a vertical state through a limiting structure. The technical scheme can adapt to clamping of optical filters with different diameters and different thicknesses, and the position is convenient to adjust so as to perform uniformity measurement on the optical filters.

Description

Technical Field

[0001] This invention belongs to the field of building fire protection design and measurement technology, specifically relating to a calibration fixture for a filter used in a building material smoke density meter. Background Technology

[0002] Smoke density is one of the core indicators of fire safety assessment. It refers to the degree of light attenuation caused by smoke when a material burns or decomposes under specific test conditions. The higher the value, the stronger the smoke's ability to block visible light, and the more difficult it is to escape and rescue in a fire.

[0003] Smoke density testing needs to be conducted in conjunction with material type, combustion conditions, and industry standards. Based on the national standard GB / T8627-2007 "Test Method for Smoke Density of Building Materials During Combustion or Decomposition," the core measurement principle of smoke density is the light intensity attenuation method. The smoke density meter evaluates the magnitude of smoke density by measuring the loss of light flux caused by the reflection of light by solid dust in the smoke produced by material combustion. The smoke density value can be expressed as the light absorptivity value Ds. The relationship between light absorptivity and light transmittance τ is Ds = 1 - τ. Therefore, the measurement of smoke density from building material combustion can be transformed into the measurement of light absorptivity. Quantified smoke density can provide a scientific basis for building fire protection design, material selection, and emergency plan development.

[0004] Optical filters are standard devices used to calibrate the luminous flux of building material smoke density meters. The filter calibration results directly affect the smoke density measurement data, which is an important theoretical basis for building fire protection design. Therefore, calibrating the filters of building material smoke density meters is a crucial step in ensuring the accuracy and reliability of the measurement data. A spectrophotometer is used for filter calibration. The filters used in building material smoke density meters vary widely in size and thickness, while existing spectrophotometers have limited sample clamps, making it difficult to measure the uniformity of the filters. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a calibration fixture for a filter for a building material smoke density measuring instrument.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A calibration fixture for a filter used in a building material smoke density meter includes a lifting platform, a left and right translation platform, and a clamping unit. The lifting platform is used to drive the left and right translation platform to move vertically up and down. The left and right translation platform is used to drive the clamping unit to translate left and right. The clamping unit includes a self-centering chuck and a sample placement seat. The sample placement seat is used to horizontally place the filter, and the self-centering chuck is used to clamp the filter. The self-centering chuck is rotatably connected to the left and right translation platform. When the self-centering chuck is flipped to a horizontal state, it clamps the filter placed on the sample placement seat or places the filter it is clamping on the sample placement seat. When the self-centering chuck is flipped to a vertical state, it clamps the filter and makes the filter vertical. The self-centering chuck is kept in a horizontal or vertical state by a limiting structure.

[0008] Furthermore, the self-centering chuck includes a fixed ring and a rotating ring. The fixed ring is rotatably connected to the left and right translation stages, and the rotating ring is rotatably connected to the fixed ring on the same axis. The fixed ring has n shafts A evenly distributed around its circumference, and the rotating ring has n sleeves evenly distributed around its circumference, n=3 or n=4. Each sleeve is slidably connected to a rocker arm. One end of the rocker arm is hinged to the shaft A, and the other end of the rocker arm is rotatably equipped with a roller. The n rollers are used to self-center and clamp the filter. The rotation drive mechanism is used to drive the rotating ring to rotate relative to the fixed ring.

[0009] Furthermore, the rotation drive mechanism specifically comprises: a hinge lug fixedly provided on the outer edge of the rotating ring, and a nut B rotatably connected to the hinge lug; a shaft C fixedly provided on the fixed ring, a rotating seat rotatably connected to the shaft C, a lead screw B rotatably connected to the rotating seat, and the lead screw B being screwed to the nut B, with a tension knob fixedly provided at the end of the lead screw B.

[0010] Furthermore, the outer surface material of the roller is rubber.

[0011] Furthermore, the limiting structure includes a fixed base and a support block fixed on the left and right translation platforms. When the self-centering chuck flips to abut against the support block, the self-centering chuck is in a horizontal state. Several magnets are fixedly arranged on the side of the fixed base facing the self-centering chuck. When the self-centering chuck flips to attract the magnets, the self-centering chuck is in a vertical state.

[0012] Furthermore, the bottom of the fixed ring is fixedly provided with a support leg, the support leg is provided with a hole D, a shaft D is fixedly inserted into the hole D, the shaft D is rotatably connected to the shaft seat through a rolling bearing, and the shaft seat is fixed on the left and right translation stage.

[0013] Furthermore, the lifting platform includes a lifting platform surface, and the left and right translation platform includes a translation platform surface. A pointer is fixedly installed on the lifting platform surface, and a scale is provided on the translation platform surface. The pointer is used to indicate the scale.

[0014] Furthermore, the lifting platform is a manual scissor lift platform.

[0015] Furthermore, the left and right translation platforms also include a lead screw A and a nut A that are matched and screwed together. The two ends of the lead screw A are respectively connected to the bearing housing through rolling bearings. The bearing housing is fixedly connected to the lifting platform. A translation knob is fixedly provided at the end of the lead screw A. The nut A is fixedly connected to the translation platform. The translation platform and the lifting platform are slidably connected through a linear guide structure.

[0016] Furthermore, the linear guide structure includes a slider and a guide rail that are matched and slidably connected to each other. The guide rail is fixedly connected to the lifting platform, and the slider is fixedly connected to the translation platform.

[0017] The beneficial effects that this invention can achieve are as follows:

[0018] (1) When measuring the uniformity of the filter, it is convenient to make precise adjustments to the center position of the filter and its distance from the center position in all directions. This technical solution uses a self-centering chuck to accommodate filters of different diameters and thicknesses. After adjusting the lifting platform and the left and right translation platforms to their respective zero points, the self-centering chuck ensures that the center of the filter is located at the measurement center position.

[0019] (2) A sample holder for horizontally placing the filter is matched with a self-centering clamp that can be flipped to a vertical or horizontal state, ensuring that the filter is in a vertical state during detection without blocking the light path.

[0020] (3) Furthermore, the self-centering chuck uses rubber rollers to hold the filter. The flexibility of the rubber ensures that the outer edge of the filter is not damaged, while the elasticity of the rubber also ensures the clamping effect. Attached Figure Description

[0021] Figure 1 This is the front view of an embodiment of the present invention.

[0022] Figure 2 This is a side view of an embodiment of the present invention.

[0023] Figure 3 This is a perspective view of an embodiment of the present invention.

[0024] Figure 4 yes Figure 1 An enlarged view of section A.

[0025] Figure 5 This is a perspective view of the self-centering chuck in an embodiment of the present invention.

[0026] Figure 6 This is a front view of the self-centering chuck in an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram (I) of the usage state of the self-centering chuck in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram (II) of the usage state of the self-centering chuck in an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram (a) of the usage state of the clamping unit in an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram (II) of the usage state of the clamping unit in an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram (III) of the usage state of the clamping unit in an embodiment of the present invention.

[0032] In the diagram: 1-Lifting platform, 101-Lifting platform surface, 102-Lifting knob; 2-Left and right sliding platform, 201-Nut A, 202-Sliding platform surface, 203-Slider, 204-Guide rail, 205-Lead screw A, 206-Bearing seat, 207-Sliding knob; 3-Fixed base, 301-Through hole, 302-Magnet, 4-Self-centering chuck, 401-Fixing ring, 402-Swing rod, 4 03-Shaft A, 404-Sleeve, 405-Shaft B, 406-Roller, 407-Support Leg, 408-Hole D, 409-Nut B, 410-Hinge, 411-Screw B, 412-Rotating Seat, 413-Shaft C, 414-Tightening Knob, 415-Rotating Ring; 5-Sample Placement Seat, 6-Support Block, 7-Shaft D, 8-Shaft Seat, 9-Pointer, 10-Scale, 99-Filter. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-3 A calibration fixture for a filter used in a building material smoke density measuring instrument includes a lifting platform 1, a left and right translation platform 2, and a clamping unit.

[0035] The lifting platform 1 is used to drive the left and right translation platform 2 to move vertically up and down. The lifting platform 1 is a manual scissor lift platform. The scissor lift platform is a common structure in the prior art, including the lifting platform surface 101 and the lifting knob 102. The other structures will not be described in detail.

[0036] The left and right translation stage 2 is used to drive the clamping unit to translate left and right. The left and right translation stage 2 includes a translation stage surface 202, and a lead screw A205 and a nut A201 that are matched and screwed together. The two ends of the lead screw A205 are respectively rolledly connected to the bearing seat 206 through rolling bearings. The bearing seat 206 is fixedly connected to the lifting stage surface 101. A translation knob 207 is fixedly provided at the end of the lead screw A205. The nut A201 is fixedly connected to the translation stage surface 202. The translation stage surface 202 and the lifting stage surface 101 are slidably connected through a linear guide structure. The linear guide structure includes a slider 203 and a guide rail 204 that are matched and slidably connected. The guide rail 204 is fixedly connected to the lifting stage surface 101, and the slider 203 is fixedly connected to the translation stage surface 202.

[0037] The clamping unit includes a self-centering chuck 4 and a sample placement seat 5, the sample placement seat 5 being used to horizontally place the filter 99 (e.g. Figure 9 As shown), the self-centering chuck 4 is used to hold the filter 99, and the self-centering chuck 4 is rotatably connected to the left and right translation stages 2. Figure 5 and Figure 6 As shown, the self-centering chuck 4 includes a fixed ring 401 and a rotating ring 415. The fixed ring 401 is rotatably connected to the left and right translation stages 2, and the rotating ring 415 is rotatably connected to the fixed ring 401 on the same axis. Three shafts A403 are evenly distributed around the fixed ring 401, and three sleeves 404 are evenly distributed around the rotating ring 415. The sleeves 404 are rotatably connected to the rotating ring 415 through shafts B405. Each sleeve 404 is slidably connected to a rocker arm 402. One end of the rocker arm 402 is hinged to the shaft A403, and the other end of the rocker arm 402 is rotatably equipped with a roller 406. The three rollers 406 are used for self-centering and clamping the filter 99. The outer surface of the rollers 406 is made of rubber. The rotation drive mechanism is used to drive the rotating ring 415 to rotate relative to the fixed ring 401. The rotation drive mechanism is as follows: a hinge 410 is fixedly provided on the outer edge of the rotating ring 415, and a nut B409 is rotatably connected to the hinge 410; a shaft C413 is fixedly provided on the fixed ring 401, a rotating seat 412 is rotatably connected to the shaft C413, a lead screw B411 is rotatably connected to the rotating seat 412, and the lead screw B411 is screwed to the nut B409. A tension knob 414 is fixedly provided at the end of the lead screw B411. A support leg 407 is fixedly provided at the bottom of the fixed ring 401, and a hole D408 is provided on the support leg 407. A shaft D7 is fixedly inserted into the hole D408, and the shaft D7 is rotatably connected to the shaft seat 8 through a rolling bearing. The shaft seat 8 is fixed on the left and right translation stage 2.

[0038] When the self-centering chuck 4 is flipped to a horizontal position, it clamps the filter 99 placed on the sample placement seat 5 or places the filter 99 it holds onto the sample placement seat 5. Figure 10 As shown; when the self-centering chuck 4 is flipped to the vertical position, the self-centering chuck 4 clamps the filter 99 and makes the filter 99 vertical, as shown. Figure 11 As shown; the self-centering chuck 4 is held in a horizontal or vertical state by a limiting structure. The limiting structure includes a fixed base 3 and a support block 6 fixed on the left and right translation stages 2. When the self-centering chuck 4 is flipped to abut against the support block 6, the self-centering chuck 4 is in a horizontal state; several magnets 302 (e.g., ...) are fixedly arranged on the side of the fixed base 3 facing the self-centering chuck 4. Figure 4 As shown, when the self-centering chuck 4 is flipped to engage the magnet 302, the self-centering chuck 4 is in a vertical position. The fixing base 3 is provided with a through hole 301, which is designed to avoid the light path.

[0039] To facilitate determining the left and right translation dimensions of the filter 99, a pointer 9 is fixedly mounted on the lifting platform 101, and a scale 10 (which can be a ruler with a resolution of 1 mm) is provided on the translation platform 202. The pointer 9 is used to indicate the scale 10. Similarly, those skilled in the art can refer to this left and right translation scale indicator unit to set up the lifting scale indicator unit, which will not be elaborated here.

[0040] Use of this embodiment:

[0041] First, adjust the lifting platform 1 and the left and right translation platforms 2 to their respective zero points.

[0042] like Figure 9 As shown, the filter 99 is now placed horizontally on the sample holder 5, ensuring that the filter 99 is in a horizontal state.

[0043] Adjust the tension knob 414 of the self-centering chuck 4 to open the three rollers 406 to a certain extent, flip the self-centering chuck 4 to a horizontal position, and then adjust the tension knob 414 in the opposite direction to clamp the filter 99 placed on the sample placement seat 5 with the three rollers 406. Figure 10 As shown.

[0044] Flip the self-centering chuck 4 to a vertical position. The rotating ring 415 of the self-centering chuck 4 engages with the magnet 302. At this time, the filter 99 is in a vertical position. Figure 11 As shown.

[0045] The position of filter 99 will be adjusted up, down, left, and right as needed for subsequent testing.

Claims

1. A calibration fixture for a filter used in a building material smoke density meter, characterized in that: It includes a lifting platform (1), a left and right translation platform (2), and a clamping unit; the lifting platform (1) is used to drive the left and right translation platform (2) to move vertically up and down; the left and right translation platform (2) is used to drive the clamping unit to move horizontally; the clamping unit includes a self-centering chuck (4) and a sample placement seat (5), the sample placement seat (5) is used to place the filter horizontally, the self-centering chuck (4) is used to clamp the filter, and the self-centering chuck (4) is rotatably connected to the left and right translation platform (2); when the self-centering chuck (4) is flipped to the horizontal state, the self-centering chuck (4) clamps the filter placed on the sample placement seat (5) or places the filter it clamps on the sample placement seat (5); when the self-centering chuck (4) is flipped to the vertical state, the self-centering chuck (4) clamps the filter and makes the filter vertical; the self-centering chuck (4) is kept in the horizontal or vertical state by a limiting structure.

2. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 1, characterized in that: The self-centering chuck (4) includes a fixed ring (401) and a rotating ring (415). The fixed ring (401) is rotatably connected to the left and right translation stages (2). The rotating ring (415) is rotatably connected to the fixed ring (401) on the same axis. There are n shafts A (403) evenly distributed around the fixed ring (401). There are n sleeves (404) evenly distributed around the rotating ring (415), n=3 or n=4. Each sleeve (404) is slidably connected to a rocker arm (402). One end of the rocker arm (402) is hinged to the shaft A (403). The other end of the rocker arm (402) is rotatably provided with a roller (406). The n rollers (406) are used for self-centering and clamping the filter. The rotation drive mechanism is used to drive the rotating ring (415) to rotate relative to the fixed ring (401).

3. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 2, characterized in that: The rotation drive mechanism is specifically as follows: a hinge (410) is fixedly provided on the outer edge of the rotating ring (415), and a nut B (409) is rotatably connected to the hinge (410); a shaft C (413) is fixedly provided on the fixed ring (401), a rotating seat (412) is rotatably connected to the shaft C (413), a lead screw B (411) is rotatably connected to the rotating seat (412), and the lead screw B (411) is screwed to the nut B (409), and a tightening knob (414) is fixedly provided at the end of the lead screw B (411).

4. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 2, characterized in that: The outer surface material of the roller (406) is rubber.

5. The calibration fixture for the filter of the building material smoke density meter according to claim 2, characterized in that: The limiting structure includes a fixed seat (3) and a support block (6) fixed on the left and right translation stage (2). When the self-centering chuck (4) flips to abut against the support block (6), the self-centering chuck (4) is in a horizontal state. Several magnets (302) are fixedly arranged on the side of the fixed seat (3) facing the self-centering chuck (4). When the self-centering chuck (4) flips to attract the magnets (302), the self-centering chuck (4) is in a vertical state.

6. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 2, characterized in that: The bottom of the fixed ring (401) is fixedly provided with a support leg (407), and the support leg (407) is provided with a hole D (408). A shaft D (7) is fixedly inserted into the hole D (408). The shaft D (7) is rotatably connected to the shaft seat (8) through a rolling bearing. The shaft seat (8) is fixed on the left and right translation stage (2).

7. The calibration fixture for the filter of the building material smoke density meter according to claim 1, characterized in that: The lifting platform (1) includes a lifting platform surface (101), and the left and right translation platform (2) includes a translation platform surface (202). A pointer (9) is fixedly installed on the lifting platform surface (101), and a scale (10) is installed on the translation platform surface (202). The pointer (9) is used to indicate the scale (10).

8. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 7, characterized in that: The lifting platform (1) is a manual scissor lift.

9. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 7, characterized in that: The left and right translation platform (2) also includes a lead screw A (205) and a nut A (201) that are screwed together. The two ends of the lead screw A (205) are respectively connected to the bearing seat (206) by rolling bearings. The bearing seat (206) is fixedly connected to the lifting platform (101). The end of the lead screw A (205) is fixedly provided with a translation knob (207). The nut A (201) is fixedly connected to the translation platform (202). The translation platform (202) and the lifting platform (101) are slidably connected by a linear guide structure.

10. The calibration fixture for the filter of the building material smoke density measuring instrument according to claim 9, characterized in that: The linear guide structure includes a slider (203) and a guide rail (204) that are matched and slidably connected. The guide rail (204) is fixedly connected to the lifting platform (101), and the slider (203) is fixedly connected to the translation platform (202).

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