Optical filter switching assembly of spectrophotometer

Abstract

The optical filter switching assembly comprises a cam, a swing rod, an optical filter disc and a front cover plate, the front cover plate is located between the swing rod and the optical filter disc, the swing rod comprises a correction part and a rotating part, the rotating part is connected with the optical filter disc through a rotating shaft, the rotating shaft penetrates through the front cover plate, and the front cover plate is connected with the correction part. The cam drives the swing rod to rotate, and the swing rod drives the filter disc to rotate. A cam containing groove is formed in the face, opposite to the cam, of the rotating part, a step is arranged on one end face of the cam, and the horizontal plane of the step is connected with the cam containing groove. A correction hole is formed in the correction part, the correction hole is connected with one end of a spring, and the other end of the spring is fixedly connected with a screw on the front cover plate. Through the mutual cooperation of the cam and the swing rod, the rapid switching of the optical filters can be effectively realized, and the switching process is smooth without blocking.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of spectrophotometer, concretely to a filter switching assembly of spectrophotometer. BACKGROUND

[0002] Spectrophotometer, also known as spectrometer, is a scientific instrument that decomposes complex light into spectral lines, and the measurement range generally includes the visible light region with a wavelength range of 380-780nm and the ultraviolet light region with a wavelength range of 200-380nm. Different light sources have their own emission spectrum, so different light bodies can be used as the light source of the instrument. The emission spectrum of tungsten lamp: the spectral light with a wavelength range of 380-780nm emitted by the tungsten lamp source can be obtained by refraction through a triangular prism, and a continuous color spectrum composed of red, orange, yellow, green, blue, indigo and purple can be obtained. The color spectrum can be used as the light source of the visible light spectrophotometer.

[0003] When the spectrophotometer is used, the filter switching is realized by the linkage rotation of the filter disc, the cam and the swing rod. However, the transmission of the cam and the swing rod is not smooth, which leads to the problem of untimely light wave switching. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a filter switching assembly of spectrophotometer to solve the problem in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: including cam, swing rod, filter disc and front cover plate, the front cover plate is located in the middle of the swing rod and the filter disc, the swing rod includes correction part and rotation part, the rotation part is connected with the filter disc through the rotating shaft, the rotating shaft penetrates the front cover plate, the cam drives the swing rod to rotate, the swing rod drives the filter disc to rotate.

[0006] The rotation part is provided with a cam accommodating groove on the opposite surface of the cam, one end surface of the cam is provided with a step, and the horizontal surface of the step is connected with the cam accommodating groove.

[0007] The correction part is provided with a correction hole, one end of the spring is connected with the correction hole, and the other end of the spring is fixedly connected with the screw on the front cover plate.

[0008] Optionally, the rotation part is provided with a mounting hole, and the rotating shaft is inserted into the mounting hole.

[0009] Optionally, the rotation part is provided with a reinforcing assembly, the reinforcing assembly includes longitudinal reinforcing ribs and transverse reinforcing ribs, and the longitudinal reinforcing ribs and the transverse reinforcing ribs are staggered on the side surface of the rotation part.

[0010] Optionally, the opposite surface is an inclined surface, and the cam accommodating groove is arranged adjacent to the highest point of the inclined surface.

[0011] Optionally, a slope is arranged at the connection of each step.

[0012] Optionally, the correction part and the rotating part are integrally formed by plastic material.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] The steps on the cam and the cam accommodating groove on the swing rod are matched with each other, so that the light filter disc can timely and accurately switch the light wave. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the present application;

[0016] Figure 2 Fig. 2 is a schematic diagram of part of the structure of the present application;

[0017] Figure 3 Fig. 3 is a schematic diagram of the structure of the swing rod in the present application;

[0018] Figure 4 Fig. 4 is a front view of the swing rod structure in the present application;

[0019] Figure 5 Fig. 5 is a schematic diagram of the cam structure in the present application. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects of the present application will be described in detail below in combination with the drawings and preferred embodiments.

[0021] As Figures 1 to 5As shown in the figure, a filter switching assembly of a spectrophotometer comprises a cam 2, a swing lever 1, a filter disc 3 and a front cover plate 5, the front cover plate 5 is located between the swing lever 1 and the filter disc 3, the swing lever 1 comprises a correction part 11 and a rotating part 12, the rotating part 12 is connected with the filter disc 3 through a rotating shaft 6, the rotating shaft 6 penetrates the front cover plate 5, the cam 2 drives the swing lever 1 to rotate, and the swing lever 1 drives the filter disc 3 to rotate; the rotating part 12 is provided with a cam accommodating groove 121 on an opposite surface 123 of the cam 2, one end surface of the cam 2 is provided with a step 21, and the horizontal surface of the step 21 is connected with the cam accommodating groove 121; the correction part 11 is provided with a correction hole 111, the correction hole 111 is connected with one end of a spring 4, and the other end of the spring 4 is fixedly connected with a screw 51 of the front cover plate 5. The rotating part 12 is provided with a mounting hole 124, and the rotating shaft 6 is inserted into the mounting hole 124. Each step connection position of the step 21 is provided with a slope. The slope design of the step connection position can reduce the impact when the cam contacts the swing lever and improve the transmission stability. The opposite surface 123 is an inclined surface, and the cam accommodating groove 121 is arranged at the position adjacent to the highest point of the inclined surface. The swing lever 1 and the filter disc 3 are connected through the rotating shaft 6, and the filter disc switches the filter disc through the swing of the swing lever 1.

[0022] The swing lever 1 in the utility model is made of plastic material and is formed by a mold, so that the production process is more convenient than the traditional cam swing lever manufacturing, and the production cost is greatly reduced by the plastic material.

[0023] As Figure 4 As shown in the figure, the reinforcing assembly 122 comprises longitudinal reinforcing ribs and transverse reinforcing ribs, the longitudinal reinforcing ribs and the transverse reinforcing ribs are distributed on the side surface of the rotating part 12 in a staggered manner, and the strength and rigidity of the reinforcing parts are realized through the longitudinal reinforcing ribs and the transverse reinforcing ribs.

[0024] In use, the string on the sleeve cam 2 is pulled to rotate the cam 2, the cam 2 rotates to drive the swing rod 1 in contact with the horizontal surface of the step 21 to swing up and down, and drive the rotating shaft 6 to rotate, so that the filter disc 3 rotates. When the cam 2 runs to the interface of two steps, the vertical surface between the steps is in contact with the inclined surface (i.e. the opposite surface 123) of the swing rod 1, and the swing rod 1 is pressed downward, at this time the horizontal surface of the step 21 is out of the cam accommodating groove 121. When the cam 2 continues to rotate forward, the horizontal surface of the next step 21 will enter the cam accommodating groove 121 again, so as to complete the process of light wave switching. That is, in the use process, when the horizontal surface of the step 21 of the cam is in contact with the cam accommodating groove 121 of the swing rod, the filter disc 3 does not switch, when the horizontal surface of the step 21 of the cam begins to be out of the cam accommodating groove 121 of the swing rod, the filter disc 3 begins to switch, and when the horizontal surface of the next step enters the cam accommodating groove 121 of the swing rod 1, the whole switching process is completed.

[0025] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical scheme of the present application. Any modification, change, equivalent change and modification of the above embodiments, which does not depart from the technical scheme of the present application, and which is based on the technical essence of the present application, still belongs to the scope of the technical scheme of the present application.

Claims

1. A filter switching assembly for a spectrophotometer, characterized in that, The device includes a cam (2), a rocker arm (1), a filter disc (3), and a front cover plate (5). The front cover plate (5) is located between the rocker arm (1) and the filter disc (3). The rocker arm (1) includes a correction part (11) and a rotating part (12). The rotating part (12) is connected to the filter disc (3) through a rotating shaft (6). The rotating shaft (6) passes through the front cover plate (5). The cam (2) drives the rocker arm (1) to rotate, and the rocker arm (1) drives the filter disc (3) to rotate. The rotating part (12) has a cam receiving groove (121) on the opposite side (123) of the cam (2), and a step (21) is provided on one end face of the cam (2), and the horizontal surface of the step (21) is connected to the cam receiving groove (121); The correction part (11) is provided with a correction hole (111), the correction hole (111) is connected to one end of the spring (4), and the other end of the spring (4) is fixedly connected to the screw (51) on the front cover plate (5).

2. The filter switching assembly of the spectrophotometer according to claim 1, characterized in that, The rotating part (12) has a mounting hole (124) and the rotating shaft (6) is inserted into the mounting hole (124).

3. The filter switching assembly for a spectrophotometer according to claim 1, characterized in that, The rotating part (12) is provided with a reinforcing component (122), which includes longitudinal reinforcing ribs and transverse reinforcing ribs, and the longitudinal reinforcing ribs and transverse reinforcing ribs are distributed alternately on the side of the rotating part (12).

4. The filter switching assembly for a spectrophotometer according to claim 1, characterized in that, The opposite surface (123) is an inclined surface, and the cam receiving groove (121) is located near the highest point of the inclined surface.

5. The filter switching assembly for a spectrophotometer according to claim 1, characterized in that, The correction part (11) and the rotating part (12) are integrally molded from plastic material.

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