Lamp box for detecting knife-edge-shaped ruler

Abstract

The utility model discloses a lamp box for detecting a knife-edge-shaped ruler. The lamp box comprises a hand wheel, a movable rod, a lamp box body, a shading plate, a kinematic pair and a strip-shaped fluorescent lamp tube. The hand wheel is fixed to the side, with external threads, of the movable rod, the movable rod is connected with the lamp box body through threads and connected with the shading plate through an O-shaped ring, the lamp box body is a component for fixing the strip-shaped fluorescent lamp tube, the shading plate and the movable rod, the shading plate is connected to the lamp box body, and the movable rod is fixed to the lamp box body. The light-transmitting width between the shading plate and the lamp box body can be adjusted through rotation of the hand wheel. According to the light box structure, the inconvenience that the width of a light gap is adjusted by manually replacing shading plates with different widths in the prior art can be improved, the light-transmitting gap of the light box can be accurately and finely adjusted by adjusting the hand wheel through the light box structure, and meanwhile the light box structure has good operability and convenience.

Description

Technical Field

[0001] The utility model relates to a light box structure, in particular to a light box for calibrating a knife-edge ruler. Background Art

[0002] According to the national verification regulations JJG 63-2007 "Knife-shaped ruler", when verifying the straightness of the working edge of the knife-shaped ruler, use the light box as an auxiliary tool, take the working edge of the knife-shaped ruler as the axis, swing it back and forth about 15°, and carefully observe the size of the light-transmitting gap between its working edge and the working surface of the grinding flat ruler. For knife-shaped rulers of 175mm and below, observe the light-transmitting gap. If there is no visible light gap or visible blue light, it is determined that the straightness of its working edge is not greater than 1μm, otherwise the straightness of the working edge is greater than 1μm, and according to the metrological performance requirements, the maximum allowable error of the straightness of the working edge of the knife-shaped ruler of 175mm and below is 1μm, that is, the size of the light-transmitting gap directly affects the qualification of the straightness of the working edge of the knife-shaped ruler. Effective and reasonable control of the light-transmitting gap of the light box is more conducive to observing the above-mentioned light gap and the color of the light source, and is conducive to making an accurate judgment on the straightness of the working edge of the knife-shaped ruler being tested.

[0003] In the prior art, most ordinary light box structures adjust the light-transmitting gap by manually replacing shading plates of different widths, and fine-tuning is not possible. If the light gap size is not appropriate, the different light and light colors passing through different gaps may not be effectively observed, which will affect the inspection results and lead to misjudgment. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a knife-edge ruler calibration light box to solve the problems that the existing ordinary light box cannot fine-tune the light-transmitting gap, the light gap size is not suitable, the different light and light colors transmitted through different gaps cannot be effectively observed, and the straightness of the working edge of the knife-edge ruler being tested cannot be accurately judged.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a knife-edge ruler calibration light box, comprising a handwheel, a kinematic pair, a light box body, a shading plate, a movable rod, and a strip fluorescent tube. The handwheel and the movable rod are tightly connected, and the movable rod can be displaced in a direction perpendicular to the light box body by rotating the handwheel. The other end of the movable rod is tightly connected to the shading plate via an O-ring, the shading plate is connected to the light box body, and the strip fluorescent tube is connected to the light box body. After power is turned on, light is transmitted through the gap formed by the shading plate and the lower edge of the light box body.

[0006] In order to further improve the performance of the utility model, the movable rod is made of a flexible material, has a certain degree of curvature while ensuring strength, and can undergo appropriate elastic deformation.

[0007] In order to further improve the performance of the utility model, one end of the kinematic pair is fixedly connected to the movable rod, and the other end is an auxiliary connection to assist the movable rod in maintaining the state after elastic deformation when moving.

[0008] In order to further improve the performance of the utility model, the shading plate is connected to the inner side of the light box body, and can be driven by the movable rod to make a quarter-circle motion with the connection point as the center. The shading plate and the light box body completely overlap in the initial state. As the quarter-circle motion is made, the light-transmitting gap between the shading plate and the light box body gradually increases.

[0009] In order to further improve the performance of the utility model, the strip fluorescent tube is a common fluorescent tube on the market, and no special requirements are made on its brightness.

[0010] Compared with the prior art, the beneficial effect of the utility model is that the knife-edge ruler calibration light box can improve the inconvenience of adjusting the light gap width by manually replacing light shielding plates of different widths in the prior art. Through the light box structure, the light transmission gap of the light box can be accurately fine-tuned by adjusting the hand wheel. The light transmission gap of the light box can be effectively and reasonably controlled, which is more conducive to observing the light gap and the color of the light source, and is conducive to accurately judging the straightness of the working edge of the knife-edge ruler being inspected. At the same time, it has good operability and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a structural schematic diagram of a knife-edge ruler calibration light box.

[0012] The following are the descriptions of the reference numerals:

[0013] 1. Hand wheel; 2. Kinematic pair; 3. Light box body; 4. Sunshade; 5. Movable rod; 6. Strip fluorescent tube. DETAILED DESCRIPTION

[0014] The following will further describe the implementation of the present utility model in detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0015] In the description of the present invention, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0016] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See also Figure 1 The utility model provides a technical solution: a knife-shaped ruler calibration light box, including a hand wheel 1, a kinematic pair 2, a light box body 3, a shading plate 4, a movable rod 5, and a strip fluorescent tube 6. The hand wheel 1 and the movable rod 5 are tightly connected. By rotating the hand wheel 1, the movable rod 5 can be displaced in a direction perpendicular to the light box body 3. The other end of the movable rod 5 is tightly connected to the shading plate 4 through an O-ring. The shading plate 4 is connected to the light box body 3, and the strip fluorescent tube 6 is connected to the light box body 3. After power is turned on, light is transmitted through the gap formed by the shading plate 4 and the lower edge of the light box body 3.

[0018] In the above structure, the hand wheel and the movable rod are connected in a tight connection, and the connecting end of the movable rod and the hand wheel has a thread that can be fixed on the light box body. By turning the hand wheel, the thread on the light box body can be moved left and right, driving the movable rod to move in a direction perpendicular to the light box body. The other end of the movable rod is tightly connected to the shading plate through an O-ring, the shading plate is connected to the light box body, and the strip fluorescent tube is fixed on the light box body. After power is turned on, turning the hand wheel can drive the shading plate at the other end of the movable rod to form a certain angle with the light box body. The larger the angle, the wider the light-transmitting gap formed by the shading plate and the lower edge of the light box body, and the more light gaps are transmitted, that is, the light-transmitting gap can be accurately fine-tuned by turning the hand wheel.

[0019] In order to further improve the performance of the utility model, the movable rod of the light box is made of flexible material and has a certain degree of curvature while ensuring strength, and can undergo appropriate elastic deformation. One end of the kinematic pair is fixedly connected to the movable rod, and the other end is an auxiliary connection, which serves to maintain the state of the elastic deformation generated when the movable rod moves, and can effectively maintain the current light-transmitting gap to facilitate accurate observation.

[0020] In order to further improve the performance of the utility model, the shading plate is connected to the inner side of the light box body, specifically, it can be connected by a hinge or other rotatable movable means, and can move in a quarter arc with the connection point as the center under the drive of the movable rod. The shading plate and the light box body are completely overlapped in the initial state to ensure that there is no light gap. As the shading plate moves in a quarter arc, the light-transmitting gap between the shading plate and the light box body gradually increases. The strip fluorescent tube is an ordinary fluorescent tube on the market, and no special requirements are made for its brightness. In the above structure, the thread pitch of the connecting end of the hand wheel and the movable rod is small enough to accurately fine-tune the light-transmitting gap between the shading plate and the light box body, which is more conducive to observing the light gap and the color of the light source, and is conducive to making an accurate judgment on the straightness of the working edge of the knife-shaped ruler being tested.

[0021] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A knife-edge ruler calibration light box, characterized in that: The invention comprises a hand wheel (1), a kinematic pair (2), a light box body (3), a shading plate (4), a movable rod (5), and a strip fluorescent tube (6). The hand wheel (1) and the movable rod (5) are tightly connected. By rotating the hand wheel (1), the movable rod (5) can be displaced in a direction perpendicular to the light box body (3). The other end of the movable rod (5) is tightly connected to the shading plate (4) via an O-ring. The shading plate (4) is connected to the light box body (3), and the strip fluorescent tube (6) is connected to the light box body (3). After power is turned on, light is transmitted through the gap formed by the shading plate (4) and the lower edge of the light box body (3).

2. The knife-edge ruler calibration light box according to claim 1, characterized in that: The movable rod (5) is made of a flexible material and has a degree of curvature while ensuring strength, and can be elastically deformed.

3. The knife-edge ruler calibration light box according to claim 1, characterized in that: One end of the kinematic pair (2) is fixedly connected to the movable rod (5), and the other end is an auxiliary connection, which helps the movable rod (5) maintain its state after elastic deformation when moving.

4. The knife-edge ruler calibration light box according to claim 1, characterized in that: The shading plate (4) is connected to the inner side of the light box body (3) and can move in a quarter arc with the connection point as the center under the drive of the movable rod (5). The shading plate (4) and the light box body (3) completely overlap in the initial state. As the shading plate (4) and the light box body (3) move in a quarter arc, the light-transmitting gap between the shading plate (4) and the light box body (3) gradually increases.

5. The knife-edge ruler calibration light box according to claim 1, characterized in that: The strip fluorescent tube (6) is a fluorescent tube available on the market, and no special requirements are made on its brightness.

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