Single-slit thermal expansion coefficient tester

Abstract

The utility model discloses a thermal expansion coefficient tester adopting a single-slit method. The thermal expansion coefficient tester comprises a base, a laser, a heating cylinder and a CCD (Charge Coupled Device) signal processor, a to-be-tested metal bar and a lower knife edge mounted on the to-be-tested metal bar are mounted in the heating cylinder; the device is characterized in that a liftable XY-axis manual sliding table, a three-dimensional adjusting frame connected with the XY-axis manual sliding table, an upper knife edge which is arranged on the three-dimensional adjusting frame and is parallel to the lower knife edge, and a lifting adjuster for driving the upper knife edge to lift are also arranged on the heating cylinder. According to the utility model, the X-axis and Y-axis manual sliding table, the three-dimensional adjusting frame and the lifting adjuster are matched to carry out three-dimensional adjustment on the upper knife edge, so that the upper knife edge and the lower knife edge can be in a completely parallel state, and the experiment accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of thermal expansion coefficient measuring instruments, specifically to a single-slit method thermal expansion coefficient measuring instrument. Background Technology

[0002] The coefficient of thermal expansion is an important physical quantity describing the deformation of solid materials under temperature changes. It is a commonly used physical quantity in engineering technology and scientific research, and the measurement of the coefficient of thermal expansion is also one of the classic experiments in university physics experiments. In existing technologies, such as the Chinese invention patent published on June 9, 2017, with publication number CN106814100A, a device for measuring the coefficient of thermal expansion of materials using single-slit diffraction is disclosed. The device is characterized by: a laser, a single-slit device matched with the laser, and an observation device matched with the single-slit device. The single-slit device includes two symmetrically arranged shells, a heating cylinder is arranged inside the shell, a resistance wire is arranged in the interlayer of the heating cylinder, a metal rod to be measured is arranged inside the heating cylinder, one end of the metal rod to be measured is connected to the blade through an insulating connector, and a horizontally distributed single slit is formed between the two blades. A temperature sensor is also arranged inside the shell, the temperature sensor is in contact with the metal rod to be measured, and the temperature sensor is also connected to a temperature measuring and control instrument through a wire.

[0003] In the aforementioned techniques, the upper and lower blades cannot be adjusted in three dimensions. During installation, it is easy for the upper and lower blades to become unequal and unbalanced, leading to deviations and reducing experimental accuracy. Therefore, a single-slit method thermal expansion coefficient measuring instrument with three-dimensional blade adjustment is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a single-slit thermal expansion coefficient measuring instrument to solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a single-slit thermal expansion coefficient measuring instrument, comprising a base, a laser slidably mounted on the base, a heating cylinder, and a CCD signal processor; the heating cylinder contains a metal rod to be tested and a lower cutting edge mounted on the metal rod; characterized in that the heating cylinder is further equipped with a liftable XY-axis manual slide, a three-dimensional adjustment frame connected to the XY-axis manual slide, an upper cutting edge mounted on the three-dimensional adjustment frame parallel to the lower cutting edge, and a lifting adjuster for driving the upper cutting edge to rise and fall.

[0006] Preferably, the heating cylinder is equipped with a lifting rod, an adjusting seat mounted on the lifting rod and connected to the XY axis manual slide, and locking screws for adjusting and fixing the lifting rod and the adjusting seat respectively.

[0007] Preferably, the lifting adjuster includes a fixed base, a guide sleeve mounted on the fixed base, a knife edge fixing base that is adjustablely mounted in the guide sleeve and fixed to the upper knife edge, and a micrometer head that drives the knife edge fixing base to lift and lower to adjust the upper knife edge.

[0008] Preferably, the blade holder is also fitted with a spring and a limiting screw that limits the spring.

[0009] Preferably, the base is also equipped with an adjustment rod for raising and lowering the laser and CCD signal processor, an adjustment seat for guiding the adjustment rod, and a locking screw for locking the adjustment rod; the adjustment seat and the upper heating cylinder are also equipped with a second locking screw that is locked on the base.

[0010] Preferably, the laser is further equipped with a laser mounting bracket fixed to the adjusting rod; the laser mounting bracket includes a laser fixing plate, a laser adjusting plate for fixing the laser, and adjusting screws installed on the laser fixing plate for adjusting the laser adjusting plate.

[0011] Preferably, at least one steel ball and a tension spring are installed between the laser fixing plate and the laser adjusting plate.

[0012] Preferably, a quartz rod is also mounted on the metal rod to be tested; a blade holder for fixing the lower blade is mounted on the quartz rod.

[0013] Preferably, the base is also equipped with several adjustable feet to ensure the base remains stable.

[0014] The beneficial effects of this invention are as follows: by using a manual slide table on the XY axis, a three-dimensional adjustment frame, and a lifting adjuster to perform three-dimensional adjustment of the upper cutting edge, the upper cutting edge can be made to be completely parallel to the lower cutting edge, thereby improving the accuracy of the experiment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a partial structural schematic diagram of the present invention.

[0017] Figure 3 This is a cross-sectional view of the lifting regulator of this utility model.

[0018] Figure 4 This is a utility model Figure 3 A magnified view of a portion of point A in the middle.

[0019] Figure 5 This is a structural schematic diagram of the laser fixing frame of this utility model.

[0020] Figure 6 This is a schematic diagram of the structure of the metal rod to be tested in this utility model.

[0021] Legend: 1. Base; 101. Adjusting rod; 102. Adjusting seat; 103. Locking screw; 104. Second locking screw; 105. Adjusting foot; 2. Laser; 201. Laser fixing plate; 202. Laser adjusting plate; 203. Adjusting screw; 204. Steel ball; 205. Tension spring; 3. Heating cylinder; 301. Metal rod to be tested; 302. Lifting rod; 303. Adjusting seat; 304. Locking screw; 305. Quartz rod; 306. Knife edge holder; 4. CCD signal processor; 5. Lower knife edge; 6. XY axis manual slide; 7. Three-dimensional adjustment frame; 8. Upper knife edge; 9. Lifting adjuster; 901. Fixing seat; 902. Knife edge fixing seat; 903. Micrometer head; 904. Spring; 905. Limiting screw; 906. Guide sleeve. Detailed Implementation

[0022] The single-slit thermal expansion coefficient measuring instrument of this utility model will be further described below with reference to the accompanying drawings.

[0023] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0024] See appendix Figures 1-6 As shown, this embodiment of a single-slit thermal expansion coefficient measuring instrument includes a base 1, a laser 2 slidably mounted on the base 1, a heating cylinder 3, and a CCD signal processor 4. The heating cylinder 3 houses a metal rod 301 to be tested and a lower blade 5 mounted on the metal rod 301. The heating cylinder 3 is characterized by also being equipped with a liftable XY-axis manual slide 6, a three-dimensional adjustment frame 7 connected to the XY-axis manual slide 6, an upper blade 8 parallel to the lower blade 5 mounted on the three-dimensional adjustment frame 7, and a lifting adjuster 9 that drives the upper blade 8 to rise and fall. By utilizing the XY-axis manual slide 6, the three-dimensional adjustment frame 7, and the lifting adjuster 9 to perform three-dimensional adjustment of the upper blade 8, the upper blade 8 can be made completely parallel to the lower blade 5, thereby improving the accuracy of the experiment.

[0025] See appendix Figure 2 As shown, the heating cylinder 3 is equipped with a lifting rod 302, an adjusting seat 102 that is fitted onto the lifting rod 302 and connected to the XY axis manual slide table 6, and locking screws 304 that adjust and fix the lifting rod 302 and the adjusting seat 102 respectively; by using the locking screws 304 to lock the adjusting seat 102 and the lifting rod 302, it is easy to lock the adjusting seat 102 and the lifting rod 302.

[0026] See appendix Figures 3-4 As shown, the lifting adjuster 9 includes a fixed base 901, a guide sleeve 906 mounted on the fixed base, a knife edge fixing base 902 adjustablely mounted inside the guide sleeve 906 and fixed to the upper knife edge 8, and a micrometer head 903 that drives the knife edge fixing base 902 to lift and lower to adjust the upper knife edge 8. The knife edge fixing base 902 is also fitted with a spring 904 and a limiting screw 905 that limits the spring 904. By rotating the micrometer head 903 to push the knife edge fixing base 902 downward, the spring 904 between the guide sleeve 906 and the limiting screw 905 is compressed, allowing the upper knife edge 8 to be adjusted downward. By rotating the micrometer head 903 in the opposite direction, the knife edge fixing base 902, without the downward force of the micrometer head 903, returns to its original position using the elasticity of the spring 904, causing the knife edge fixing base 902 to move upward until the limiting screw 905 contacts the micrometer head 903, allowing the upper knife edge 8 to be adjusted upward, thus facilitating fine-tuning of the upper knife edge 8.

[0027] See appendix Figure 1 As shown, the base 1 is also equipped with an adjustment rod 101 for raising and lowering the laser 2 and the CCD signal processor 4, an adjustment seat 102 for guiding the adjustment rod 101, and a locking screw 103 for locking the adjustment rod 101; the adjustment seat 102 and the heating cylinder 3 are also equipped with a second locking screw 104 locked on the base 1; the height is adjusted by sliding the adjustment rod 101 up and down along the adjustment seat 102, and after adjustment, the adjustment rod 101 is locked with the locking screw 103, which facilitates the height adjustment of the laser 2 and the CCD signal processor 4; by locking the adjustment seat 102 and the heating cylinder 3, which slide along the base 1 to adjust the distance, with the second locking screw 104, it is easy to fix the adjustment seat 102 and the heating cylinder 3.

[0028] See appendix Figure 5 As shown, a laser mounting bracket is also installed on the outside of the laser 2 and fixed on the adjusting rod 101. The laser mounting bracket includes a laser mounting plate 201, a laser adjusting plate 202 for fixing the laser 2, and an adjusting screw 203 installed on the laser mounting plate 201 to adjust the laser adjusting plate 202. A steel ball 204 and a tension spring 205 are installed between the laser mounting plate 201 and the laser adjusting plate 202. By rotating the adjusting screw 203, the adjusting screw 203 pushes the laser adjusting plate 202 forward, causing the laser adjusting plate 202 to drive the laser 2 forward. At the same time, the tension spring 205 is stretched. By rotating the adjusting screw 203 in the opposite direction, the laser adjusting plate 202 loses the outward pushing force and is driven by the elastic force of the tension spring 205 to move the laser 2 back, thereby facilitating the adjustment of the laser 2.

[0029] See appendix Figure 6As shown, a quartz rod 305 is also installed on the metal rod 301 to be tested; a knife edge holder 306 for fixing the lower knife edge 5 is installed on the quartz rod 305; several adjusting feet 105 are also installed on the base 1 to facilitate the stability of the base 1; by installing the quartz rod 305 between the metal rod 301 to be tested and the knife edge holder 306, the quartz rod 305 has a small coefficient of thermal expansion, which improves the accuracy of the measurement of the metal rod 301 to be tested.

[0030] In the process of using this invention, firstly, the XY-axis manual slide 6 drives the three-dimensional adjustment frame 7, the lifting adjuster 9, and the upper blade 8 to adjust in the XY-axis direction. The three-dimensional adjustment frame 7 is used to adjust the lifting adjuster 9 and the upper blade 8 in three dimensions. Then, rotating the micrometer head 903 pushes the blade fixing seat 902 downwards, compressing the spring 904 between the guide sleeve 906 and the limit screw 905. This allows the upper blade 8 to be adjusted downwards. Alternatively, rotating the micrometer head 903 in the opposite direction will cause the blade fixing seat 902 to return to its original position using the elasticity of the spring 904, without the downward force of the micrometer head 903. The movement continues until the limit screw 905 contacts the micrometer head 903, allowing the upper blade 8 to be adjusted upwards, bringing the upper blade 8 and lower blade 5 into a completely balanced state. During the experiment, the laser generated by the laser 2 will produce diffraction after passing between the upper blade 8 and the lower blade 5, and will project diffraction fringes onto the CCD signal processor 4. The heating cylinder 3 heats the metal rod 301 to be tested. After the metal rod 301 is heated and expands, it will drive the lower blade 5 to move upwards, and the diffraction fringes on the CCD signal processor 4 will also change. Based on this change, the thermal expansion coefficient of the metal rod 301 to be tested can be accurately calculated.

[0031] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A single-slit thermal expansion coefficient measuring instrument, comprising a base (1), a laser (2) slidably mounted on the base (1), a heating cylinder (3), and a CCD signal processor (4); wherein a metal rod to be tested (301) and a lower cutting edge (5) mounted on the metal rod to be tested (301) are installed inside the heating cylinder (3); characterized in that... The heating cylinder (3) is also equipped with a liftable XY-axis manual slide (6), a three-dimensional adjustment frame (7) connected to the XY-axis manual slide (6), an upper blade (8) parallel to the lower blade (5) installed on the three-dimensional adjustment frame (7), and a lifting adjuster (9) that drives the upper blade (8) to rise and fall.

2. The single-slit thermal expansion coefficient measuring instrument according to claim 1, characterized in that: The heating cylinder (3) is equipped with a lifting rod (302), an adjustment seat (102) fitted on the lifting rod (302) and connected to the XY axis manual slide (6), and locking screws (304) for adjusting and fixing the lifting rod (302) and the adjustment seat (102) respectively.

3. The single-slit thermal expansion coefficient measuring instrument according to claim 1, characterized in that: The lifting adjuster (9) includes a fixed base (901), a guide sleeve (906) mounted on the fixed base, a knife edge fixing base (902) that is adjustablely mounted in the guide sleeve (906) and fixed to the upper knife edge (8), and a micrometer head (903) that drives the knife edge fixing base (902) to lift and lower to adjust the upper knife edge (8).

4. The single-slit thermal expansion coefficient measuring instrument according to claim 3, characterized in that: The blade holder (902) is also fitted with a spring (904) and a limiting screw (905) that limits the spring (904).

5. The single-slit thermal expansion coefficient measuring instrument according to claim 1, characterized in that: The base (1) is also equipped with an adjustment rod (101) for raising and lowering the laser (2) and the CCD signal processor (4), an adjustment seat (102) for guiding the adjustment rod (101), and a locking screw (103) for locking the adjustment rod (101); the adjustment seat (102) and the heating cylinder (3) are also equipped with a second locking screw (104) locked on the base (1).

6. The single-slit thermal expansion coefficient measuring instrument according to claim 5, characterized in that: The laser (2) is also equipped with a laser mounting bracket fixed on the adjusting rod (101); the laser mounting bracket includes a laser mounting plate (201), a laser adjusting plate (202) for fixing the laser (2), and adjusting screws (203) installed on the laser mounting plate (201) to adjust the laser adjusting plate (202).

7. The single-slit thermal expansion coefficient measuring instrument according to claim 6, characterized in that: At least one steel ball (204) and a tension spring (205) are installed between the laser fixing plate (201) and the laser adjusting plate (202).

8. The single-slit thermal expansion coefficient measuring instrument according to claim 1, characterized in that: A quartz rod (305) is also installed on the metal rod (301) to be tested; a knife edge holder (306) for fixing the lower knife edge (5) is installed on the quartz rod (305).

9. The single-slit thermal expansion coefficient measuring instrument according to claim 1, characterized in that: The base (1) is also equipped with several adjustable feet (105) to facilitate the stability of the base (1).

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