Device for testing surface flatness of sample

Abstract

The utility model relates to the field of sample testing, in particular to a device for testing the surface flatness of a sample, which comprises a horizontal table, a vertical connecting plate connected with one side of the horizontal table in a sliding manner, a pressing plate fixed at the top of the connecting plate and parallel to the horizontal table, two gears rotatably arranged in the horizontal table, and the two gears are symmetrically arranged about the center line of the horizontal table. The gears are connected with a power source, the two gears are symmetrically arranged in the horizontal table, two vertical racks are fixed to the two sides of the face, facing the horizontal table, of the connecting plate, the two racks are meshed with the two gears respectively, vertical guide rods are fixed to the bottoms of the two sides of the free end of the pressing plate, guide holes are formed in the horizontal table, and the guide rods are slidably connected into the guide holes. According to the utility model, the flatness of the sample and the parallelism of the parallel surfaces can be detected.

Description

Technical Field

[0001] This utility model relates to the field of sample testing, specifically to a device for testing the flatness of a sample surface. Background Technology

[0002] After profile processing, hardness testing is a crucial step in ensuring material performance and product quality. Hardness testing not only reflects the material's mechanical strength but also provides important reference data for subsequent applications. However, the flatness of the sample significantly affects the hardness test results. Unevenness on the sample surface can lead to poor contact between the indenter and the sample, causing measurement errors and affecting the accuracy of the final hardness value. Therefore, before conducting hardness testing, the flatness of the sample must be strictly controlled and tested to ensure the authenticity and reliability of the measurement results.

[0003] Currently, most tests on the flatness of profile surfaces focus on testing a single surface, such as the flatness measuring device disclosed in Chinese Patent CN105547201B. However, for profiles with two parallel surfaces, such as cuboids, in addition to testing the flatness of a single surface, the parallelism of the two parallel surfaces is also crucial. Therefore, there is an urgent need for a device that can conveniently measure the flatness of a sample surface and the parallelism of the two surfaces of the sample. Utility Model Content

[0004] The present invention aims to provide a device for testing the flatness of a sample surface, so as to facilitate the detection of the flatness of the sample and the parallelism of parallel surfaces.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An apparatus for testing the flatness of a sample surface includes a horizontal platform, a vertical connecting plate slidably connected to one side of the horizontal platform, a pressure plate fixed to the top of the connecting plate parallel to the horizontal platform, two gears rotatably arranged inside the horizontal platform, the two gears being symmetrically arranged about the center line of the horizontal platform, the gears being connected to a power source, the two gears being symmetrically arranged inside the horizontal platform, two vertical racks fixed on both sides of the connecting plate facing the horizontal platform, the two racks meshing with the two gears respectively, vertical guide rods fixed to the bottom of both sides of the free end of the pressure plate, guide holes being opened on the horizontal platform, and the guide rods being slidably connected in the guide holes.

[0007] Preferably, as an improvement, a drive shaft is connected between the two gears, and one of the gears is connected to a motor via a speed reducer.

[0008] Preferably, as an improvement, the connecting plate has a vertical dovetail groove on the side facing the water platform, and a dovetail-shaped connecting slider is connected to the water platform, with the connecting slider slidably connected in the dovetail groove.

[0009] Preferably, as an improvement, the dovetail groove is integrally formed with the water platform, and the connecting plate is integrally formed with the pressure plate.

[0010] Preferably, as an improvement, the connecting plate is provided with a scale.

[0011] Preferably, as an improvement, the water platform is provided with a transparent horizontal tube, which is filled with a horizontal liquid, and horizontal reference lines are provided at both ends of the horizontal tube.

[0012] The principles and beneficial effects of this solution are as follows:

[0013] 1. Initially, the pressure plate is placed on the surface of a horizontal platform. When measuring the sample, place the horizontal platform on a flat surface, ensuring it is level. Then, place the sample on the platform and insert a feeler gauge between the platform and the sample to measure the gap between them. This completes the measurement of the flatness of the sample's bottom. The drive gear rotates, causing the rack to descend and press the pressure plate against the top surface of the sample. Inserting a feeler gauge between the sample and the pressure plate completes the measurement of the flatness of the sample's top. If the flatness of both the bottom and top of the sample is within the error range, it indicates that the parallelism of the bottom and top of the sample also meets the standard, thus completing the measurement of the parallelism of the top and bottom of the sample.

[0014] 2. This method places the sample between the horizontal platform and the pressure plate, which not only enables the above measurements but also ensures the stability of the sample by pressing it down with the pressure plate, thereby guaranteeing the measurement accuracy of the sample.

[0015] 3. This solution uses two gears to simultaneously drive two racks to lift and lower the connecting plate and pressure plate. Compared to a single gear drive, this provides more power and faster lifting speed. Furthermore, the connecting plate experiences balanced force, preventing uneven force distribution on one side that could hinder lifting. Once the connecting plate is in position, it is directly positioned by the meshing of the two gears, eliminating the need for additional positioning structures and making it convenient to use.

[0016] 4. In addition to controlling the direction of movement through the meshing of gears and racks, this design also incorporates guide rods and connecting sliders to guide the lifting and lowering of the connecting plate. The dual guiding effect of the guide rods and connecting sliders greatly improves the stability of the connecting plate's lifting and lowering. The integral molding of the pressure plate and connecting plate ensures structural strength. The guide rods are located at the bottom of the pressure plate, with their tops not extending to the top of the pressure plate, reducing the vertical space occupied by the equipment, keeping the pressure plate surface flat, and facilitating stacking during storage and transportation.

[0017] 5. The two gears are connected by a connecting shaft and can be driven by a single power source, saving power resources. Furthermore, driving them by a single power source ensures the synchronization of the two gears, further guaranteeing balanced force on the connecting plate and consistent lifting rates at both ends of the connecting plate.

[0018] 6. The connecting plate is marked with graduations to help the operator determine the height of the pressure plate, allowing for easy adjustment based on the sample height for proper sample placement. This adjustable pressure plate structure offers high versatility and can be used to measure samples of different sizes. Furthermore, the gear and rack drive for raising and lowering the connecting plate and pressure plate is more convenient and efficient than manual adjustment, while also automatically positioning the pressure plate.

[0019] 7. Set up a level tube on the water platform. Adjust the position of the water platform so that the level liquid in the level tube is level with the horizontal reference lines on both sides. This indicates that the water platform is level, which makes it easy to adjust the level of the water platform and avoids large errors in sample measurement results due to the water platform not being level. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0021] Figure 2 This is a partial structural diagram of the water platform in Embodiment 1 of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the water platform in Embodiment 3 of this utility model. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The reference numerals in the accompanying drawings include: water platform 1, connecting slider 11, connecting plate 2, dovetail groove 21, pressure plate 3, guide rod 4, rack 41, horizontal tube 5, and horizontal reference line 51.

[0025] Example 1:

[0026] like Figure 1 and Figure 2As shown, a device for testing the flatness of a sample surface includes a horizontal platform 1, a connecting plate 2, and a pressure plate 3. The connecting plate 2 is vertically slidably connected to the left side of the horizontal platform 1. Specifically, the right side of the connecting plate 2 has a vertical dovetail groove 21, and the left side of the horizontal platform 1 has an integrally formed dovetail-shaped connecting slider 11, which is slidably connected within the dovetail groove 21. The pressure plate 3 is integrally formed at the top of the connecting plate 2 and is parallel to the horizontal platform 1. Two gears (not shown in the figure) are rotatably mounted on the front and rear sides of the left end of the horizontal platform 1. The two gears are symmetrically arranged about the center line of the horizontal platform 1, and a drive shaft connects the two gears. One of the gears is connected to a motor via a reducer. Two vertical racks 41 are screwed to the right sides of the connecting plate 2, and the two racks 41 mesh with the two gears respectively. Vertical guide rods 4 are screwed to the bottom of the front and rear sides of the right end of the pressure plate 3. Guide holes are opened on the front and rear sides of the right end of the horizontal platform 1, and the guide rods 4 are slidably connected within the guide holes.

[0027] In practical application, when not in use, the pressure plate 3 is placed on the horizontal platform 1. When in use, the horizontal platform 1 is placed on the operating surface and adjusted to be level (this can be done using an existing level). The motor is started to drive the gear to rotate, and the gear drives the connecting plate 2 and the pressure plate 3 to rise through the rack 41. Then, the sample is placed on the horizontal platform 1. A 0.02mm feeler gauge is inserted between the bottom of the sample and the horizontal platform 1 to measure the gap between them. If the feeler gauge cannot be inserted or can be inserted just right, it indicates that the flatness of the bottom of the sample meets the standard, and subsequent measurements can be performed; otherwise, it indicates that the flatness of the bottom of the sample does not meet the standard, and the sample needs to be prepared again.

[0028] The subsequent measurement involves starting the motor to drive the gear to rotate in the opposite direction. The gear, through the rack 41, drives the connecting plate 2 and the pressure plate 3 to descend until the pressure plate 3 presses down on the top of the sample. Then, a 0.02mm feeler gauge is inserted between the top of the sample and the pressure plate 3 to measure the gap between them. If the feeler gauge cannot be inserted or can be inserted just right, it indicates that the flatness of the top of the sample meets the standard, and also that the parallelism between the top and bottom surfaces of the sample meets the standard. Conversely, if the feeler gauge cannot be inserted, it indicates that the flatness of the bottom of the sample does not meet the standard, and the sample needs to be prepared again.

[0029] Example 2:

[0030] The difference between this embodiment and embodiment 1 is that the connecting plate 2 is marked with scales, and setting scales on the connecting plate 2 makes it easier to control the height of the connecting plate 2 and the pressure plate 3.

[0031] Example 3:

[0032] like Figure 3As shown, the difference between this embodiment and embodiment 1 is that a transparent horizontal leveling tube 5 is installed on the water platform 1. The leveling tube 5 is filled with leveling liquid, and horizontal reference lines 51 are set at both ends of the leveling tube 5. The horizontal reference lines 51 are in a horizontal state. This embodiment can help the water platform 1 to be level without the need for an additional level. When both ends of the leveling liquid in the leveling tube 5 are flush with the horizontal reference lines 51, it means that the water platform 1 is level. In actual use, a colored leveling liquid can be used to make it easier to observe.

[0033] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An apparatus for testing the flatness of a sample surface, characterized in that: The device includes a water platform with a vertical connecting plate slidably connected to one side. A pressure plate parallel to the water platform is fixed to the top of the connecting plate. Two gears are rotatably installed inside the water platform, symmetrically arranged about the center line of the water platform. The gears are connected to a power source. Two vertical racks are fixed on both sides of the connecting plate facing the water platform, and the racks mesh with the two gears respectively. Vertical guide rods are fixed to the bottom of both sides of the free end of the pressure plate. Guide holes are opened on the water platform, and the guide rods are slidably connected in the guide holes.

2. The apparatus for testing the flatness of a sample surface according to claim 1, characterized in that: A drive shaft connects the two gears, and one of the gears is connected to a motor via a speed reducer.

3. The apparatus for testing the flatness of a sample surface according to claim 2, characterized in that: The connecting plate has a vertical dovetail groove on the side facing the water platform, and a dovetail-shaped connecting slider is connected to the water platform, which slides within the dovetail groove.

4. The apparatus for testing the flatness of a sample surface according to claim 3, characterized in that: The dovetail groove and the water platform are integrally formed, and the connecting plate and the pressure plate are integrally formed.

5. The apparatus for testing the flatness of a sample surface according to claim 4, characterized in that: The connecting plate has markings.

6. The apparatus for testing the flatness of a sample surface according to claim 1, characterized in that: A transparent horizontal pipe is installed on the water platform. The horizontal pipe is filled with a horizontal liquid, and a horizontal baseline is set at both ends of the horizontal pipe.

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