A flatness detection device and a detection method

Abstract

The application discloses a flatness detection device and detection method, and belongs to the technical field of detection devices.The application is characterized in that: a plurality of horizontal bowls are connected in series through transparent water pipes to form a closed loop; the horizontal bowls are filled with conductive liquid; the upper end of the horizontal bowl is provided with a depth micrometer; the side surface of the horizontal bowl is provided with a metal needle; one end of the metal needle is in contact with the conductive liquid; one end of the detection unit box is connected with the metal needle on the horizontal bowl through a wire; the other end of the detection unit box is electrically connected with the measuring head of the depth micrometer; and the side surface of the detection unit box is provided with a display lamp.The application measures the flatness of the measured part by the cooperation of the horizontal bowl unit and the detection unit box; the display lamp displays the contact state between the measuring head of the depth micrometer and the conductive liquid, and the value can be read when the depth micrometer and the conductive liquid are in a micro-touch state; the error caused by manual measurement can be avoided, and accurate and stable measurement can be realized.

Description

Technical Field

[0001] This invention belongs to the field of engineering manufacturing technology, and in particular relates to a flatness detection device and detection method. Background Technology

[0002] In the process of engineering manufacturing, there are often requirements for the flatness of products. At present, there are various methods and means for testing the flatness of products, such as feeler gauge measurement, flat crystal interferometry, micrometer measurement, level measurement, autocollimator method, laser tracker method, and coordinate measuring machine method.

[0003] Among these methods, the feeler gauge measurement method, while simple and inexpensive, suffers from low accuracy, low efficiency, and incomplete results, making it unsuitable for measuring the flatness of large surfaces on parts. The optical plane interferometry and micrometer methods are primarily used for measuring the small surfaces of smooth parts. The level measurement method is widely used for measuring the straightness and flatness of parts, offering high accuracy, good stability, small size, and portability, making it well-suited for measuring the flatness of large surfaces. However, this method requires repeatedly moving the instrument and recording data at each measuring point, which is time-consuming, labor-intensive, and involves lengthy adjustment times and cumbersome data processing procedures. While autocollimator, laser tracker, and coordinate measuring machine methods offer high measurement accuracy, they are expensive and have high usage and maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a flatness detection device and method, which measures the flatness of the part to be measured by setting up a horizontal bowl unit and a detection unit box; the contact status between the measuring head of the depth micrometer and the conductive liquid is displayed by an indicator light, and the value can be read when the measuring head of the depth micrometer is in a state of slight contact with the conductive liquid; this can avoid the errors caused by manual measurement and achieve accurate and stable measurement.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a flatness testing device, comprising a level bowl unit, wherein the level bowl unit includes a plurality of level bowls; the plurality of level bowls are connected in series to form a closed loop via transparent water pipes; the level bowls are filled with conductive liquid; a depth micrometer is mounted on the upper end of each level bowl; a metal needle is mounted on the side of each level bowl; one end of the metal needle is in contact with the conductive liquid; a testing unit box; one end of the testing unit box is connected to the metal needle on the level bowl via a wire; the other end of the testing unit box is electrically connected to the measuring head of the depth micrometer; and an indicator light is mounted on one side of the testing unit box.

[0006] Furthermore, the horizontal bowl is a cylindrical structure made of metal, and the inner wall of the horizontal bowl is laminated with an insulating layer; a through hole is provided on one side of the horizontal bowl, and an insulating interface is installed in the through hole; the metal needle is installed in the insulating interface.

[0007] Furthermore, a metal clamp is installed on the wire, and the wire is connected to the metal needle through the metal clamp.

[0008] Furthermore, the detection unit box includes a metal housing; a control circuit is installed in the middle of the metal housing; a cover plate is installed on the top of the metal housing; the cover plate is fixed to the metal housing by a number of fixing screws.

[0009] Furthermore, the control circuit of the detection unit box includes a relay KA, a battery, a resistor R, and an adjustable resistor RP; one end of the adjustable resistor RP is connected to the negative terminal of the battery, and the other end of the adjustable resistor RP is connected in series with a Zener diode ZD and the coil of the relay KA, and then connected to the measuring head of the depth micrometer through a wire; one end of the resistor R is connected to the negative terminal of the battery, and the other end of the resistor R is connected in series with an indicator light and the contacts of the relay KA, and then connected to the measuring head of the depth micrometer through a wire; the positive terminal of the battery is connected to a metal needle through a wire.

[0010] A method for detecting flatness includes the following steps: Stp1, Place several horizontal bowls on the plane of the device to be tested; Stp2, connect all the horizontal bowls in series to form a closed loop through transparent water pipes, and pour conductive liquid into the horizontal bowls; Stp3: Connect one end of the detection unit box to the metal needle on the horizontal bowl via a wire, and electrically connect the other end to the measuring head of the depth micrometer. Stp4. Insert the depth micrometer into the horizontal bowl to be measured, adjust the depth micrometer to measure the distance between the conductive liquid and the rim of the horizontal bowl, and observe the indicator light on the detection unit box. Stp5. When the indicator light on the detection unit box is lit, read the value from the depth micrometer. Step 6: Repeat steps 3-5 to obtain depth readings for all horizontal bowls, completing the measurement of the horizontal plane.

[0011] The present invention has the following beneficial effects: This invention measures the flatness of the part under test by using a horizontal bowl unit and a detection unit box; the contact status between the measuring head of the depth micrometer and the conductive liquid is displayed by an indicator light, and the value can be read when the measuring head of the depth micrometer is in a state of slight contact with the conductive liquid; this can avoid the errors caused by manual measurement and achieve accurate and stable measurement.

[0012] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a flatness detection device; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A magnified view of a section at point B in the middle; Figure 4 This is the front view of the horizontal bowl unit; Figure 5 for Figure 4 Cross-sectional view at point AA; Figure 6 Exploded view of the inspection unit box; Figure 7 The control circuit diagram for the detection unit box; Figure 8 This is a schematic diagram of the structure of Embodiment 1; Figure 9 for Figure 8 A magnified view of a section at point C; Figure 10 This is a schematic diagram of the structure of Example 2; Figure 11 for Figure 10 A magnified view of a section at point D. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] This application presents a flatness testing device based on the principle of communicating vessels and combined with circuit design, designed for detecting the flatness of continuous or discontinuous surfaces of medium to large-sized parts or equipment. In actual use, several horizontal bowls are selected according to the size of the part or equipment being tested. These bowls are connected in series through several transparent water pipes to form a closed loop. A clean, conductive liquid medium (mineral water can be selected as the conductive liquid medium for environmental protection, cost, and convenience) is injected into the horizontal bowls, filling all the transparent water pipes with mineral water, while simultaneously ensuring that each horizontal bowl is filled with mineral water to a certain depth.

[0017] Please see Figure 1-6 As shown, the present invention is a flatness detection device, including a horizontal bowl unit 1 and a detection unit box 3; the horizontal bowl unit 1 includes a plurality of horizontal bowls 101; the plurality of horizontal bowls 101 are connected in series to form a closed loop through a transparent water pipe 2; the horizontal bowls 101 are filled with a conductive liquid; the conductive liquid can be mineral water; like Figure 2-5 As shown, a depth micrometer 106 is installed on the upper end of the horizontal bowl 101; a metal needle 105 is installed on the side of the horizontal bowl 101; one end of the metal needle 105 is in contact with the conductive liquid. The horizontal bowl 101 is a cylindrical metal structure. Strict requirements are placed on the parallelism of the upper and lower end faces of each horizontal bowl and the equal height of all horizontal bowls. The inner wall of the horizontal bowl 101 is laminated with an insulating layer 102. The insulating layer 102 can be made of materials such as ceramic, acetal, or Teflon. One side of the horizontal bowl 101 has a through hole, within which an insulating interface 104 is installed. A metal needle 105 is installed inside the insulating interface 104. A metal clamp 5 is installed on the wire 4, and the wire 4 is connected to the metal needle 105 through the metal clamp 5. One end of the detection unit box 3 is connected to the metal needle 105 on the horizontal bowl 101 via the wire 4; the other end of the detection unit box 3 is electrically connected to the measuring head of the depth micrometer 106. like Figure 6 As shown, the detection unit box 3 includes a metal housing 301; a control circuit is installed in the middle of the metal housing 301; a cover plate 309 is installed on the top of the metal housing 301; the cover plate 309 is fixed to the metal housing 301 by several fixing screws 308; and an indicator light 302 is installed on one side of the detection unit box 3.

[0018] like Figure 7As shown, the control circuit of the detection unit box 3 includes a relay KA303, a battery 304, a resistor R305, and an adjustable resistor RP306. One end of the adjustable resistor RP306 is connected to the negative terminal of the battery 304, and the other end of the adjustable resistor RP306 is connected in series with a Zener diode ZD307 and the coil of the relay KA303, and then connected to the measuring head of the depth micrometer 106 through a wire 4. One end of the resistor R305 is connected to the negative terminal of the battery 304, and the other end of the resistor R305 is connected in series with an indicator light 302 and the contact of the relay KA303, and then connected to the measuring head of the depth micrometer 106 through a wire 4. The positive terminal of the battery 304 is connected to the metal needle 105 through a wire 4.

[0019] The working principle of the control circuit of the detection unit box 3 is as follows: The level bowl 101, the depth micrometer 106, and the housing 301 of the detection unit box are all made of conductive metal. Therefore, during measurement, the above elements, along with the relay 303, the indicator light 302, the Zener diode 307, the fixed resistor 305, and the adjustable resistor 306, are connected to the negative terminal of the power supply, forming the negative voltage side. Due to the insulation effect of the insulating layer 102 and the insulating interface 104, the mineral water is completely isolated from the metal conductors such as the level bowl, and the mineral water is connected in series with the metal needle 105, the metal clamp 5, and the wire 4, and connected to the positive terminal of the power supply, forming the positive voltage side. Thus, when the depth micrometer 106 measures the liquid depth, the entire electrical circuit is completed when the probe of the depth micrometer 106 just touches the liquid surface, and the indicator light 302 lights up, which is the point where the value is read.

[0020] The Zener diode ZD307 acts as the on / off control switch for the relay KA303 coil. When the probe of the depth micrometer 106 is not in contact with the horizontal liquid surface, the entire circuit is open, and the indicator light 302 is off. When the probe of the depth micrometer 106 is in full contact with the horizontal liquid surface or even inserted into the liquid surface, the voltage of the Zener diode 307 exceeds its own regulated voltage, thus turning on. This causes the relay KA303 to engage, its normally closed contact to open, and the indicator light 302 to turn off. The indicator light 302 is off in both cases of no contact and full contact with the horizontal liquid surface. The indicator light 302 only illuminates when the probe of the depth micrometer 106 just touches the horizontal liquid surface, and the voltage of the Zener diode 307 does not exceed its regulated voltage. Therefore, in actual measurement, the two states of no contact and full contact with the horizontal liquid surface of the depth micrometer 106 manifest as a measured value being less than the objective value and a measured value being greater than the objective value, respectively. Since this measurement method is a micro-touch detection method, both no contact and over-contact during actual measurement will lead to excessive errors in the measurement value. Therefore, this circuit is used to avoid the errors caused by manual measurement and to achieve accurate and stable measurement.

[0021] A method for detecting flatness includes the following steps: Stp1, Place several horizontal bowls 101 on the plane of the device to be tested; Stp2, connect all the horizontal bowls 101 in series through the transparent water pipe 2 to form a closed loop, and pour conductive liquid into the horizontal bowls 101; the conductive liquid should submerge the transparent water pipe 2 and reach a certain depth in the horizontal bowls 101, such as 5cm; Stp3, connect one end of the detection unit box 3 to the metal needle 105 on the horizontal bowl 101 via the wire 4, and electrically connect the other end to the measuring head of the depth micrometer 106. Stp4, Insert the depth micrometer 106 into the horizontal bowl 101 to be measured, adjust the depth micrometer 106 to measure the distance between the conductive liquid and the mouth of the horizontal bowl 101, and observe the indicator light 302 on the detection unit box 3. Stp5. When the indicator light 302 on the detection unit box 3 is lit, read the value of the depth micrometer 106. Step 6: Repeat steps 3-5 to obtain depth readings for all level bowls 101, completing the measurement of the horizontal plane.

[0022] Place each leveling bowl 101 at a suitable position on the surface of the part to be measured. After the water in the leveling bowl and the transparent water tube is stable and still, clamp the metal tube clamp 5 of the detection unit box to the end of the metal needle 105 on the leveling bowl. Carefully measure the distance between the upper surface of the leveling bowl and the horizontal liquid surface using a depth micrometer 106 and record the data. Then, measure the distance between the upper surface of all leveling bowls and the horizontal liquid surface in sequence. If the measured data are all equal, it means that the surface of the part to be measured is absolutely level, that is, the flatness is zero (this is the ideal state). Conversely, the measuring point with a larger value indicates that the plane is high, and the measuring point with a smaller value indicates that the plane is low. The difference between the maximum and minimum values ​​is the flatness of the surface of the part to be measured. When the part or equipment to be measured is being installed and adjusted, it is only necessary to lower the measured value point and raise the measured value point to achieve the final required overall flatness or equal height.

[0023] Example 1: When assembling a large two-stroke low-speed diesel engine, the first step is to measure and adjust the flatness of its base when it is placed on the assembly table. For example... Figure 8 As shown, the base 10 is fixed on the frame 11, and the frame 11 and the base 10 are supported by adjusting pads 12. Several horizontal bowls 101 are set on the finely machined upper surface of the base 10 and connected in series by transparent water pipes 2, and an appropriate amount of mineral water is injected into them.

[0024] according to Figure 9As shown, the liquid level in each level bowl is measured using a depth micrometer 106. When the indicator light 302 on the visual inspection unit box illuminates, this is the liquid level reading for that measurement point, and it is recorded. The inspection unit is then moved to the next level bowl, and the same measurement method is used to record the reading, and so on. Finally, all readings are compiled.

[0025] The flatness of the upper surface of the base can be determined from the readings at each measuring point. The flatness is the difference between the highest and lowest point values, i.e., 22.100 - 22.010 = 0.090 mm. The height of each measuring point is significantly different from the midpoint value. Therefore, when the actual measured flatness exceeds the tolerance requirement, the adjusting shim 12 can be adjusted according to the position of the high and low points. By lowering the high point and raising the low point, the upper surface of the base can be easily leveled to achieve the required flatness range.

[0026] Example 2: When installing the double-bed base of a large machine tool, it is necessary to measure and adjust its height. For example... Figure 10 As shown, two bed bases 20 are fixed on several adjusting pads 22 and supported by them. Several horizontal bowls 101 are set on the precision-machined guide rail surface of the bed base 20 according to actual needs and are connected in series by transparent water pipes 2, and an appropriate amount of mineral water is injected into them.

[0027] according to Figure 11 As shown, the liquid level in each level bowl 101 is measured using a depth micrometer 106. When the indicator light 302 on the visual inspection unit box illuminates, this is the liquid level reading for that measurement point, and it is recorded. The inspection unit is then moved to the next level bowl, and the same measurement method is used to record the reading, and so on. Finally, all readings are compiled, as shown in the example below:

[0028] The readings at each measuring point show that the flatness of the guide rail surface on the two bed bases 20 is the difference between the highest and lowest point values, i.e., 22.100 - 22.010 = 0.090 mm. The height difference between each measuring point and the middle value is obvious. Therefore, when the actual measured flatness result exceeds the tolerance requirement, the adjusting shim 22 can be adjusted according to the position of the high and low points. By lowering the high point and raising the low point, the upper guide rail surface of the bed base can be easily leveled to achieve the required equal height range.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flatness detection device, characterized in that, include A horizontal bowl unit (1) includes several horizontal bowls (101); several horizontal bowls (101) are connected in series to form a closed loop through transparent water pipes (2); the horizontal bowls (101) are filled with conductive liquid. A depth micrometer (106) is installed at the upper end of the horizontal bowl (101); a metal needle (105) is installed on the side of the horizontal bowl (101); one end of the metal needle (105) is in contact with the conductive liquid. Detection unit box (3); one end of the detection unit box (3) is connected to the metal needle (105) on the horizontal bowl (101) via a wire (4); the other end of the detection unit box (3) is electrically connected to the measuring head of the depth micrometer (106); An indicator light (302) is installed on one side of the detection unit box (3); The control circuit of the detection unit box (3) includes a relay KA (303), a battery (304), a resistor R (305), and an adjustable resistor RP (306); One end of the adjustable resistor RP (306) is connected to the negative terminal of the battery (304), and the other end of the adjustable resistor RP (306) is connected in series with the coil of the Zener diode ZD (307) and the relay KA (303) and then connected to the measuring head of the depth micrometer (106) through the wire (4). One end of the resistor R (305) is connected to the negative terminal of the battery (304), and the other end of the resistor R (305) is connected in series with the contact of the indicator lamp (302) and the relay KA (303) and then connected to the measuring head of the depth micrometer (106) through the wire (4). The positive terminal of the battery (304) is connected to the metal needle (105) via a wire (4).

2. The flatness detection device according to claim 1, characterized in that, The horizontal bowl (101) is a cylindrical structure made of metal, and the inner wall of the horizontal bowl (101) is coated with an insulating layer (102). The horizontal bowl (101) has a through hole on one side, and an insulating interface (104) is installed in the through hole; the metal needle (105) is installed in the insulating interface (104).

3. The flatness detection device according to claim 1, characterized in that, A metal clamp (5) is installed on the wire (4), and the wire (4) is connected to the metal needle (105) through the metal clamp (5).

4. The flatness detection device according to claim 1, characterized in that, The detection unit box (3) includes a metal housing (301); a control circuit is installed in the middle of the metal housing (301); a cover plate (309) is installed on the top of the metal housing (301); the cover plate (309) is fixed to the metal housing (301) by a number of fixing screws (308).

5. The detection method of the flatness detection device according to any one of claims 1-4, characterized in that, Includes the following steps: Stp1, Place several horizontal bowls (101) on the plane of the device to be tested; Stp2, connect all the horizontal bowls (101) in series to form a closed loop through the transparent water pipe (2), and pour conductive liquid into the horizontal bowls (101); Stp3, connect one end of the detection unit box (3) to the metal needle (105) on the horizontal bowl (101) through the wire (4), and electrically connect the other end to the measuring head of the depth micrometer (106); Stp4, Insert the depth micrometer (106) into the horizontal bowl (101) to be measured, adjust the depth micrometer (106) to measure the distance between the conductive liquid and the mouth of the horizontal bowl (101), and observe the indicator light (302) on the detection unit box (3); Stp5. When the indicator light (302) on the detection unit box (3) is lit, read the value of the depth micrometer (106); Stp6. Repeat steps Stp3-5 to obtain depth readings for all horizontal bowls (101) and complete the measurement of the horizontal plane.

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