Abbe refractometer

Abstract

The utility model relates to the technical field of laboratory detection and analysis instruments, in particular to an Abbe refractometer which comprises a shell and an optical assembly, the optical assembly comprises a reflecting mirror, and the shell is provided with a hand wheel; the hand wheel comprises a mounting seat and a rotating head, a through hole is formed in the rotating head, one end of the through hole is close to the mounting seat, the other end of the through hole is far away from the mounting seat, and an internal thread section is arranged at one end of the through hole far away from the mounting seat and spirally connected with an adjusting bolt. An elastic assembly and a friction piece are arranged in the through hole, one end of the elastic assembly abuts against the adjusting bolt, the other end of the elastic assembly abuts against the friction piece, and the friction piece abuts against the installation base. By the adoption of the technical scheme, resistance for resisting rotation exists in the rotating head, so that the hand wheel is not prone to being rotated by mistake, the rotating head is prevented from being rotated by mistake in the process of loosening the hand, and the rotating head is also prevented from being rotated by the hand accidentally in the observation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to laboratory detection analysis instrument technical field, concretely relates to an abbe refractometer. BACKGROUND

[0002] The abbe refractometer is an instrument capable of measuring the refractive index and average dispersion of transparent and translucent liquid or solid, and the constant temperature device can measure the refractive index of the sample within 0-75 degrees; the refractive index and average dispersion are one of important optical constants of the substance, which can be used to understand the optical performance, purity, concentration and dispersion size of the substance.

[0003] The utility model discloses a digital abbe refractometer provided in the Chinese invention patent application with the publication number CN105181648A, and the digital abbe refractometer includes operation key, power switch, display window, dispersion correction hand wheel, eyepiece, organism, spotlight illumination lamp, refractive prism, adjusting hand wheel and data interface, one side surface of the organism is equipped with the dispersion correction hand wheel, and one end of the eyepiece penetrates the inside of the dispersion correction hand wheel, one side of the dispersion correction hand wheel is equipped with the display window, and a plurality of operation keys are arranged on the plane of the display window, and the operation key side is fixed with power switch.

[0004] However, the above-mentioned digital abbe refractometer still has the following deficiencies: the dispersion correction hand wheel in the digital abbe refractometer is not provided with damping, and the dispersion correction hand wheel is easy to be misrotated in the experiment process, for example, the dispersion correction hand wheel is easy to be misrotated in the process that the operator rotates the dispersion correction hand wheel to the appropriate position and then removes the hand, and for another example, the dispersion correction hand wheel is rotated inadvertently in the observation process.

[0005] Therefore, the applicant has made deep research on the above-mentioned problems, and the present case is generated. UTILITY MODEL CONTENTS

[0006] The utility model discloses a kind of abbe refractometers, which are not easy to be misrotated.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] An abbe refractometer includes a housing and an optical assembly, the optical assembly includes a mirror mounted on the housing, characterized in that: one side of the housing is provided with a hand wheel for rotating the mirror;

[0009] The hand wheel includes a mounting seat fixed to the housing and a rotating head rotatably connected to the mounting seat.

[0010] The rotating head is provided with a through hole arranged perpendicularly to the mounting seat, one end of the through hole is close to the mounting seat, the other end is away from the mounting seat, the end of the through hole away from the mounting seat is provided with an internal thread section, and the internal thread section is screw-connected with an adjusting bolt;

[0011] An elastic assembly and a friction piece are arranged in the through hole, one end of the elastic assembly abuts against the adjusting bolt, the other end abuts against the friction piece, and the friction piece abuts against the mounting seat.

[0012] Preferably, the optical assembly further comprises a refractive prism group.

[0013] The refractive prism group comprises a first prism and a second prism, the first prism is installed on the shell through a hinged seat, and the second prism is fixed on the shell and located below the first prism.

[0014] The hinged seat is provided with a first light inlet, the shell is provided with a second light inlet, the first prism is provided with a first refractive surface and a first light inlet surface matched with the first light inlet, and the second prism is provided with a second refractive surface matched with the reflecting mirror, a second light inlet surface matched with the second light inlet and a third light inlet surface matched with the first refractive surface.

[0015] A first light shielding piece is hinged on the first light inlet, and a second light shielding piece is hinged on the second light inlet.

[0016] In the first state, the first refractive surface and the third light inlet surface are arranged in parallel and a gap is formed between the first refractive surface and the third light inlet surface, and in the second state, the first refractive surface and the third light inlet surface are arranged in dislocation.

[0017] The shell is further provided with an arc-shaped guide rail, the arc-shaped guide rail is located below the second prism, an arc-shaped sliding seat is slidingly connected on the arc-shaped guide rail, the reflecting mirror is installed on the arc-shaped sliding seat, and the arc-shaped sliding seat is provided with a gear part.

[0018] The rotating head is provided with a circular gear, and the circular gear is meshingly connected with the gear part.

[0019] Preferably, the shell is further provided with a temperature measuring module, and the temperature measuring module is fixed on the shell.

[0020] Preferably, the temperature measuring module comprises a digital thermometer.

[0021] Preferably, the shell is further rotationally connected with a lock catch for fixing the hinged seat.

[0022] Preferably, the shell is further provided with a scale housing.

[0023] The scale shell comprises a circular scale panel and a cylinder, one side of the circular scale panel is a scale surface, the other side is fixedly connected with the cylinder, the axis of the cylinder is vertically arranged on the circular scale panel and the axis of the cylinder is located on the same straight line with the center of the circular scale panel; the outer periphery of the cylinder is uniformly provided with a plurality of anti-skid strips, and the plurality of anti-skid strips are respectively arranged in parallel with the axis of the rotating head.

[0024] The scale shell is fixed on the rotating head.

[0025] Preferably, the circular scale panel, the cylinder and the plurality of anti-skid strips are integrally connected.

[0026] By adopting the technical scheme, the utility model has the advantages of:

[0027] 1. By setting the elastic assembly and the friction piece on the rotating head, and abutting one end of the elastic assembly against the adjusting bolt and the other end against the friction piece, and abutting the friction piece against the mounting seat, the rotating head has resistance to rotation, so that the hand wheel is not easy to be misrotated, which is beneficial to preventing the rotating head from being misrotated in the process of loosening the hand, and is also beneficial to preventing the rotating head from being rotated inadvertently in the observation process.

[0028] 2. By rotating the adjusting bolt to adjust the size of the rotation resistance formed by the cooperation between the compression spring, the friction piece and the mounting seat, the needs of different stages in the process of adjusting the reflecting mirror can be met, so that the efficiency is improved, for example, before coarse adjustment, the adjusting bolt is rotated away from the mounting seat, so that the abutting force between the friction piece and the mounting seat is reduced, and the rotation resistance formed by the cooperation between the compression spring, the friction piece and the mounting seat is reduced, so as to achieve the purpose of high-efficiency rotation in the coarse adjustment process; after the coarse adjustment is completed, the adjusting bolt is gradually rotated towards the mounting seat, so that the rotation resistance formed by the cooperation between the compression spring, the friction piece and the mounting seat meets the needs of preventing the experimental personnel from misrotating. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the Abbe refractometer of the utility model;

[0030] Figure 2 It is another perspective structural schematic view of the Abbe refractometer of the utility model;

[0031] Figure 3 It is a sectional structural schematic view of the hand wheel of the utility model;

[0032] Figure 4 It is a structural principle schematic view of the Abbe refractometer of the utility model;

[0033] Figure 5 It is a structural schematic view of the scale shell of the utility model (the structure of the scale surface is not shown in the figure);

[0034] Figure 6 It is another perspective view of the structure of the scale shell of the utility model.

[0035] In the figure:

[0036] 100 - shell;

[0037] 110 - hand wheel;

[0038] 120 - mounting seat;

[0039] 130 - rotating head; 131 - rotating wheel;

[0040] 132 - shaft; 133 - compression spring;

[0041] 134 - friction piece; 135 - circular gear;

[0042] 136 - adjusting bolt;

[0043] 140 - arc-shaped guide rail; 141 - arc-shaped sliding seat;

[0044] 142 - gear part;

[0045] 150 - digital temperature meter; 160 - lock catch;

[0046] 170 - hinged seat; 180 - first light shielding piece;

[0047] 190 - second light shielding piece;

[0048] 200 - optical assembly;

[0049] 210 - refractive prism group; 211 - first prism;

[0050] 212 - second prism;

[0051] 220 - reflecting mirror;

[0052] 230 - observation group; 231 - achromatic prism;

[0053] 232 - objective lens; 233 - graticule;

[0054] 234 - eyepiece;

[0055] 300 - scale shell; 310 - circular scale panel;

[0056] 311 - shell through hole;

[0057] 320 - cylinder; 321 - anti-skid strip. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0059] As shown in Figures 1-6 The embodiment provides an Abbe refractometer, which comprises a shell 100 and an optical assembly 200, and the optical assembly 200 comprises a reflecting mirror 220 mounted on the shell 100.

[0060] One side of the shell 100 is provided with a hand wheel 110 for rotating the reflecting mirror 220. The hand wheel 110 comprises a mounting seat 120 fixed on the shell 100 and a rotating head 130 rotationally connected to the mounting seat 120, and in the embodiment, the rotating head 130 comprises a rotating wheel 131 and a shaft 132, the middle part of the shaft 132 is rotationally connected to the mounting seat 120, the rotating wheel 131 is coaxially arranged with the shaft 132, one end of the shaft 132 is fixedly connected with the rotating wheel 131, and the other end is provided with a round gear 135.

[0061] A through hole perpendicular to the mounting seat 120 is formed in the rotating wheel 131 of the rotating head 130, one end of the through hole is close to the mounting seat 120, the other end of the through hole is away from the mounting seat 120, the end of the through hole away from the mounting seat 120 has an internal thread section, and the internal thread section is screw-connected with an adjusting bolt 136.

[0062] An elastic assembly and a friction piece 134 are arranged in the through hole, in the embodiment, the elastic assembly comprises a compression spring 133, one end of the compression spring 133 abuts against the adjusting bolt 136, the other end of the compression spring 133 abuts against the friction piece 134, and the friction piece 134 abuts against the mounting seat 120.

[0063] In the process of adjusting the reflecting mirror 220 by using the hand wheel 110, coarse adjustment is usually performed first, and then fine adjustment is performed; the angle required for rotating the hand wheel 110 in the process of coarse adjustment is usually larger than the angle required for rotating the hand wheel 110 in the process of fine adjustment.

[0064] When the reflecting mirror 220 needs to be adjusted during use, the rotating head 130 drives the compression spring 133 and the friction piece 134 to move together when the rotating head 130 is rotated by hand, at this time, the compression spring 133, the friction piece 134 and the mounting seat 120 cooperate to form a rotating resistance, at this time, if the rotating head 130 needs to be rotated, a force capable of making the friction piece 134 and the mounting seat 120 capable of sliding needs to be applied.

[0065] It should be noted that in the process of adjusting the reflecting mirror 220, the rotating resistance formed by the cooperation between the compression spring 133, the friction piece 134 and the mounting seat 120 can be kept unchanged, or the rotating resistance formed by the cooperation between the compression spring 133, the friction piece 134 and the mounting seat 120 can be adjusted by rotating the adjusting bolt 136 to meet the needs of different stages in the process of adjusting the reflecting mirror 220, thereby improving the efficiency. For example, before the coarse adjustment, the adjusting bolt 136 is rotated away from the mounting seat 120, so that the abutting force between the friction piece 134 and the mounting seat 120 is reduced, and the rotating resistance formed by the cooperation between the compression spring 133, the friction piece 134 and the mounting seat 120 is reduced, so as to achieve the purpose of high-efficiency rotation in the coarse adjustment process; after the coarse adjustment is completed, the adjusting bolt 136 is gradually rotated towards the mounting seat 120, so that the rotating resistance formed by the cooperation between the compression spring 133, the friction piece 134 and the mounting seat 120 meets the needs of preventing the experimental personnel from being misrotated.

[0066] In summary, by arranging the elastic assembly and the friction piece 134 on the rotating head 130, and abutting one end of the elastic assembly against the adjusting bolt 136 and the other end against the friction piece 134, and abutting the friction piece 134 against the mounting seat 120, and having the rotating head 130 internally resist rotation, the hand wheel 110 is not easy to be misrotated, which is conducive to preventing the rotating head 130 from being misrotated during the process of loosening the hand, and is also conducive to preventing the rotating head 130 from being rotated inadvertently during observation.

[0067] It should be noted that the optical assembly 200 can adopt an existing conventional structure that can be directly purchased on the market.

[0068] In the embodiment, the optical assembly 200 further includes a refractive prism group 210 and an observation group 230. It should be noted that the refractive prism group 210, the reflecting mirror 220 and the observation group 230 in the embodiment can also respectively adopt an existing conventional structure that can be directly purchased on the market.

[0069] As a preferred technical solution, the refractive prism group 210 includes a first prism 211 and a second prism 212; the first prism 211 is installed on the shell 100 through the hinged seat 170, and the second prism 212 is fixed on the shell 100 and located on the lower side of the first prism 211.

[0070] The hinged seat 170 is provided with a first light inlet, and the shell 100 is provided with a second light inlet. The first light inlet is hinged with a first light shielding piece 180, and the second light inlet is hinged with a second light shielding piece 190.

[0071] The first prism 211 has a first refractive surface and a first light inlet surface matched with the first light inlet port, and the second prism 212 has a second refractive surface matched with the reflector 220, a second light inlet surface matched with the second light inlet port, and a third light inlet surface matched with the first refractive surface.

[0072] The Abbe refractometer has a first state and a second state. The Abbe refractometer is in the first state when the first refractive surface is arranged in parallel with the third light inlet surface, and the Abbe refractometer is in the second state when the first refractive surface is arranged in dislocation with the third light inlet surface. The switching between the first state and the second state can be realized by rotating the hinge seat 170. That is, in the first state, the first refractive surface is arranged in parallel with the third light inlet surface, and a gap is formed between the first refractive surface and the third light inlet surface, and in the second state, the first refractive surface is arranged in dislocation with the third light inlet surface.

[0073] For the convenience of description, the first state is taken as an example for description. In the embodiment, the first prism 211 is a triangular prism, and the second prism 212 is an isosceles trapezoidal prism. The triangular prism has three optical surfaces, and the three optical surfaces of the first prism 211 are a first side surface, a second side surface, and a lower bottom surface, wherein the first side surface is the first light inlet surface of the first prism 211, the lower bottom surface is the first refractive surface of the first prism 211, and specifically, the lower bottom surface is horizontally arranged and arranged downward, and the first side surface and the second side surface are respectively located on the upper side of the lower bottom surface; the distance from the second side surface to the observation group 230 is less than the distance from the first side surface to the observation group 230. The isosceles trapezoidal prism has four optical surfaces, and the four optical surfaces of the second prism 212 are a third side surface, a fourth side surface, a long upper bottom surface, and a short lower bottom surface, wherein the third side surface is the second light inlet surface of the second prism 212, the long upper bottom surface is the third light inlet surface of the second prism 212, the fourth side surface is the second refractive surface of the second prism 212, and specifically, the long upper bottom surface is horizontally arranged and arranged upward, and the short lower bottom surface is horizontally arranged and arranged downward, and the distance from the fourth side surface to the observation group 230 is less than the distance from the third side surface to the observation group 230. The lower bottom surface of the first prism 211 and the long upper bottom surface of the second prism 212 are arranged in opposite directions.

[0074] The housing 100 is further provided with an arc-shaped guide rail 140 located below the refractive prism group 210, and the arc-shaped guide rail 140 is slidably connected with an arc-shaped sliding seat 141, and the reflector 220 is indirectly mounted on the housing 100 by being mounted on the arc-shaped sliding seat 141, and the arc-shaped sliding seat 141 is provided with a gear portion 142. The circular gear 135 of the rotating head 130 is meshingly connected with the gear portion 142 of the arc-shaped sliding seat 141. In use, the rotating head 130 is rotated to drive the arc-shaped sliding seat 141 to slide on the arc-shaped guide rail 140, thereby driving the reflector 220 to rotate.

[0075] As a preferred technical solution, the observation group 230 is located on one side of the refractive prism group 210. The projection of the refractive prism group 210 on the horizontal plane where the lower end of the shell 100 is located is located on one side of the projection of the mirror 220 on the horizontal plane where the lower end of the shell 100 is located, and the projection of the observation group 230 on the horizontal plane where the lower end of the shell 100 is located is located on the other side of the projection of the mirror 220 on the horizontal plane where the lower end of the shell 100 is located. The observation group 230 includes achromatic prisms 231, an objective lens 232, a graticule 233, and eyepieces 234 which are respectively mounted on the shell 100. Among them, the achromatic prisms 231 are two, and the two achromatic prisms 231 are respectively a first achromatic prism and a second achromatic prism; the graticule 233 is etched with a cross line; the eyepieces 234 adopt symmetrical eyepieces, specifically, the eyepieces 234 include two identical eyepiece cemented lenses, and the two eyepiece cemented lenses are respectively a first eyepiece cemented lens and a second eyepiece cemented lens, and the two eyepiece cemented lenses are symmetrically arranged. The first achromatic prism, the second achromatic prism, the objective lens 232, the graticule 233, the first eyepiece cemented lens, and the second eyepiece cemented lens are arranged in a straight line in the direction away from the mirror 220.

[0076] In use, when it is necessary to measure a liquid solution by using the Abbe refractometer, the hinged seat 170 is rotated so that the first prism 211 is located on the side of the second prism 212, then the measured liquid is placed on the upper long bottom surface of the second prism 212, the hinged seat 170 is rotated so that the first prism 211 is located above the second prism 212 and the measured liquid is clamped in the gap between the first refractive surface and the third light entrance surface, at this time the Abbe refractometer is in the first state, then the first light shield 180 is opened, light is emitted from the first light entrance, then the light passes through the first prism 211, the measured liquid, the second prism 212, the mirror 220, the achromatic prism 231, the objective lens 232, and the graticule 233 in turn, and then is observed through the eyepieces 234; when it is necessary to measure a transparent solid by using the Abbe refractometer, the hinged seat 170 is rotated so that the first prism 211 is located on the side of the second prism 212, at this time the Abbe refractometer is in the second state, then the solid sample to be detected is placed on the upper surface of the second prism 212, the second light shield 190 is opened, light is emitted from the second light entrance, then the light passes through the second prism 212, the solid sample to be detected, the mirror 220, the achromatic prism 231, the objective lens 232, and the graticule 233 in turn, and then is observed through the eyepieces 234. Whether it is to measure a liquid solution or to measure a transparent solid, in the use process, the rotating head 130 is rotated and the achromatic prism 231 and the eyepieces 234 are adjusted until only black and white colors are in the eyepieces 234, and the black and white color boundary line passes through the center of the cross line on the graticule 233.

[0077] As a preferred technical solution, the shell 100 is further provided with a temperature measuring module, the temperature measuring module is fixed on the shell 100, and further, the temperature measuring module comprises a digital thermometer, and the digital thermometer is fixed on the shell 100. By arranging the digital thermometer, the temperature of the measured object can be measured.

[0078] As a preferred technical solution, the shell 100 is further rotatably connected with a lock buckle 160 for fixing the hinged seat 170, the hinged seat 170 is fixed with a lock rod, and the lock buckle 160 is provided with a rod groove. When it is necessary to fix the hinged seat 170, the lock buckle 160 is rotated to make the lock rod clamped in the rod groove; when it is not necessary to fix the hinged seat 170, the lock buckle 160 is rotated to make the lock rod separated from the rod groove.

[0079] As a preferred technical solution, the Abbe refractometer further comprises a scale housing 300. The scale housing 300 comprises a circular scale panel 310 and a cylinder 320. It should be noted that the surface of the cylinder 320 facing the axis of the cylinder 320 is the inner circumferential surface of the cylinder 320, and the opposite surface is the outer circumferential surface. The circular scale panel 310 is provided with a housing through hole 311 corresponding to the adjusting bolt 136 at a position corresponding to the adjusting bolt 136.

[0080] One surface of the circular scale panel 310 is a scale surface, and the other surface is fixedly connected with the cylinder 320. The axis of the cylinder 320 is vertically arranged on the circular scale panel 310, and the axis of the cylinder 320 is located on the same straight line as the center of the circular scale panel 310. The outer circumferential surface of the cylinder 320 is uniformly provided with a plurality of anti-skid strips 321, and the plurality of anti-skid strips 321 are respectively arranged in parallel with the axis of the rotating head 130, in other words, the plurality of anti-skid strips 321 are respectively arranged in parallel with the shaft rod 132 of the rotating head 130. The scale housing 300 is fixed on the rotating head 130.

[0081] By arranging the anti-skid strips 321 on the outer circumferential surface of the cylinder 320, it is beneficial to prevent the relative slipping between the fingers of the operator and the outer circumferential surface of the cylinder 320 when rotating.

[0082] As a preferred technical solution, the circular scale panel 310, the cylinder 320 and the plurality of anti-skid strips 321 are integrally connected, which can ensure that there is no additional joint or connecting component between the components in the scale housing 300, and the scale housing 300 has good integrity.

[0083] The utility model has been described in detail above in combination with the drawings, but the implementation manner of the utility model is not limited to the above-mentioned implementation manner, and those skilled in the art can make various deformations to the utility model according to the prior art, and these all belong to the protection range of the utility model.

Claims

1. An Abbe refractometer comprising a housing and an optical assembly comprising a mirror mounted on the housing, characterised in that: One side of the shell is provided with a hand wheel for rotating the mirror; The hand wheel comprises a mounting seat fixed on the shell and a rotating head rotatably connected to the mounting seat; The rotating head is provided with a through hole arranged perpendicularly to the mounting seat, one end of the through hole is close to the mounting seat, the other end of the through hole is away from the mounting seat, the end of the through hole away from the mounting seat is provided with an internal thread section, and the internal thread section is screw-connected with an adjusting bolt; The through hole is provided with an elastic assembly and a friction piece, one end of the elastic assembly abuts against the adjusting bolt, the other end of the elastic assembly abuts against the friction piece, and the friction piece abuts against the mounting seat.

2. An Abbe refractometer as claimed in claim 1, characterized in that: The optical assembly further comprises a refractive prism group; The refractive prism group comprises a first prism and a second prism, the first prism is installed on the shell through a hinged seat, and the second prism is fixed on the shell and located below the first prism; The hinged seat is provided with a first light inlet, the shell is provided with a second light inlet, the first prism is provided with a first refractive surface and a first light inlet surface matched with the first light inlet, and the second prism is provided with a second refractive surface matched with the mirror, a second light inlet surface matched with the second light inlet, and a third light inlet surface matched with the first refractive surface; The first light inlet is hinged with a first light shielding piece, and the second light inlet is hinged with a second light shielding piece; In a first state, the first refractive surface and the third light inlet surface are arranged in parallel and a gap is formed between the first refractive surface and the third light inlet surface; in a second state, the first refractive surface and the third light inlet surface are arranged in dislocation; The shell is further provided with an arc-shaped guide rail below the second prism, the arc-shaped guide rail is slidably connected with an arc-shaped sliding seat, the mirror is installed on the arc-shaped sliding seat, and the arc-shaped sliding seat is provided with a gear part; The rotating head is provided with a circular gear, and the circular gear is meshingly connected with the gear part.

3. An Abbe refractometer as claimed in claim 2, characterized in that: The shell is further provided with a temperature measuring module fixed on the shell.

4. An Abbe refractometer as claimed in claim 3, characterized in that: The temperature measuring module comprises a digital thermometer.

5. An Abbe refractometer as claimed in claim 2, characterized in that: The shell is further rotatably connected with a lock catch for fixing the hinged seat.

6. An Abbe refractometer as claimed in claim 1, characterized in that: Further comprising a scale shell; The scale shell comprises a circular scale panel and a cylinder, one side of the circular scale panel is a scale surface, the other side is fixedly connected with the cylinder, the axis of the cylinder is arranged perpendicularly to the circular scale panel, and the axis of the cylinder is located on the same straight line with the center of the circular scale panel; the outer circumferential surface of the cylinder is uniformly provided with a plurality of anti-skid strips, and the plurality of anti-skid strips are arranged in parallel with the axis of the rotating head; The scale shell is fixed on the rotating head.

7. An Abbe refractometer as claimed in claim 6, characterized in that: The circular scale panel, the cylinder and the plurality of anti-skid strips are integrally connected.

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