Needle flame testing device for identifying flame height based on machine vision

Abstract

The utility model relates to the technical field of inspection and detection, in particular to a needle flame testing device for identifying flame height based on machine vision, and the machine vision is an identification technology for obtaining a target image through a camera and obtaining an identification result through database matching. Comprising a working chamber, a sample fixing mechanism, a needle flame mechanism and at least one camera, the sample fixing mechanism is arranged at a first position in the working chamber and can move towards a second position in the working chamber, and the needle flame mechanism is movably arranged at the second position; the at least one camera is arranged in the working chamber and used for acquiring a flame image generated by the needle flame mechanism. According to the utility model, the problems of low precision, low measurement speed and danger caused by manual measurement of flame height can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of inspection and detection, in particular to a needle flame testing device based on machine vision recognition of flame height. Background Art

[0002] The needle flame test device, also known as the needle flame tester, is a professional instrument used to simulate the fire hazard test of a small flame caused by a fault condition inside the technical assessment equipment. The needle flame test device is designed and manufactured according to the corresponding requirements of IEC60695-11-5, GB5169.5-2008 and other standards, and has automatic ignition, automatic combustion, flame adjustment and flame measurement functions. The working principle of the needle flame test device is to use a needle-shaped burner of specified size (usually 0.9mm outer diameter and 0.5mm inner diameter) to burn the sample at a specified 45° angle, observe whether the sample causes combustion, the continuous burning time of the sample and the length of combustion, to assess the fire hazard of components or combustible materials caused by internal equipment faults.

[0003] In the prior art, when performing a needle flame test, the flame height is usually measured manually using a digital display vernier caliper, and the flame height is adjusted to obtain the flame height specified by the test requirements. However, such manual measurement has low accuracy, slow speed and certain risks to the operator. Utility Model Content

[0004] In order to solve the problems in the above-mentioned background technology, the utility model provides a needle flame testing device based on machine vision to identify flame height.

[0005] The solution adopted by the utility model to solve its technical problems is:

[0006] A needle flame test device based on machine vision for flame height recognition, wherein the machine vision is a recognition technology that obtains a target image through a camera and obtains a recognition result through database matching, and is characterized in that it includes: a studio, a sample fixing mechanism, a needle flame mechanism, and at least one camera, wherein the sample fixing mechanism is arranged at a first position in the studio and the sample fixing mechanism can move toward a second position in the studio, the needle flame mechanism can be movably arranged at the second position, and the at least one camera is arranged in the studio and is used to obtain a flame image generated by the needle flame mechanism. In this case, the height of the needle flame (referred to as flame height) can be quickly and accurately obtained based on machine vision after the flame image is obtained by the camera, and the possible dangerous factors of manual measurement can be reduced.

[0007] The needle flame test device based on machine vision flame height recognition of the utility model can optionally be provided with the sample fixing mechanism in the working room via a slide rail, so that the sample can be transported easily.

[0008] The needle flame test device based on machine vision flame height recognition involved in the utility model can optionally have the working room in a box shape, and the working room includes a base, a shell, and a filter arranged on the shell. In this case, the shell can protect the mechanism in the working room, the base can facilitate the installation of various mechanisms and improve the center of gravity stability of the device, and the filter can filter the gas after the needle flame test to reduce environmental pollution.

[0009] The needle flame test device based on machine vision flame height recognition involved in the utility model, optionally, the sample fixing mechanism includes a fixing column, a positioning part and a clamping part, the fixing column can be movably set at the first position, the positioning part can be slidably set on the fixing column, and the clamping part is set on the positioning part and is used to clamp and fix the sample to be tested. In this case, when performing the needle flame test, according to the test requirements, such as the relative position of the sample and the needle flame, the sample can be clamped and fixed by the clamping part, and the position and height of the sample can be adjusted by the positioning part, and finally the sample can be moved to the vicinity of the needle flame by the fixing column to complete the needle flame test, thereby improving the flexibility of the equipment.

[0010] The needle flame test device based on machine vision flame height recognition of the utility model can optionally be provided with the fixing column on the base through a slide rail, so that the sample can be easily transported to the test point through the fixing column of the sample fixing mechanism.

[0011] The needle flame test device based on machine vision recognition of flame height involved in the utility model optionally further includes a control system, the control system includes a first control module for controlling the movement of the sample fixing mechanism from the first position to the second position, a second control module for controlling the flame state of the needle flame mechanism, and a third control module for controlling the at least one camera to obtain the flame image and output the flame height of the needle flame mechanism based on the flame image and the flame height database. In this case, the first control module controls the movement of the sample fixing mechanism to facilitate moving the sample to the designated test location, the second control module controls the flame state to facilitate operations such as ignition, flame off and adjustment according to the test requirements during the test, and the third control module controls the camera and obtains the flame height according to the camera image to improve the intelligence of the equipment, thereby improving the accuracy and efficiency of the needle flame test through the three control modules.

[0012] The needle flame test device based on machine vision flame height recognition of the utility model, optionally, the control system further comprises a human-machine interaction interface, and the human-machine interaction interface is arranged on the outer surface of the shell. In this case, it is convenient for operators to operate, and at the same time, the danger of personnel entering the working room to operate is reduced.

[0013] The needle flame test device based on machine vision flame height recognition involved in the utility model, optionally, the needle flame mechanism includes a fixing rod, an igniter, a combustion gas source and a needle-shaped burner, the fixing rod is arranged on the base, the igniter is used for igniting the burner, and the burner is used for continuously generating flames. In this case, the needle flame mechanism can simulate various different flames to test the sample.

[0014] The needle flame test device based on machine vision flame height recognition involved in the utility model, optionally, the burner is tilted at a 45° angle, the igniter is arranged near the needle tip end of the burner, the combustion gas source is connected to the burner through an air pipe, the combustion gas source is arranged outside the shell, and the gas of the combustion gas source includes acetylene, propylene and butane. In this case, the burner is tilted at a 45° angle, which can reduce the situation of sample combustion falling and losing the burner, and at the same time make the needle flame have the same flame shape as the vertically formed needle flame. The combustion gas source is arranged outside the shell to improve the safety of the equipment.

[0015] The needle flame test device based on machine vision flame height recognition of the utility model can optionally have the imaging center of the at least one camera set at the same height as the needle tip of the burner. In this case, the needle flame can be calibrated to create a flame height database and accurately obtain the flame height during testing.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the needle flame test device based on machine vision to identify flame height involved in this embodiment.

[0018] Figure 2 This is a structural block diagram of the needle flame test device based on machine vision to identify flame height involved in this embodiment.

[0019] Figure 3 This is an enumeration diagram of the flame height database in the needle flame testing device based on machine vision to identify flame height involved in this embodiment.

[0020] Figure 4 This is a schematic diagram of the relationship between the needle flame and the camera position in the needle flame testing device based on machine vision to identify flame height involved in this embodiment.

[0021] In the figure: 1…needle flame test device; 11…workroom; 12…sample fixing mechanism; 13…needle flame mechanism; 14…control system; 15…camera; 111…slide rail; 112…base; 113…housing; 114…filter; 121…fixing column; 122…positioning part; 123…clamping part; 131…fixing rod; 132…igniter; 133…combustion gas source; 134…burner; 141…first control module; 142…second control module; 143…third control module; 144…human-computer interaction interface; 2…sample to be tested. DETAILED DESCRIPTION

[0022] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.

[0023] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0024] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.

[0025] The utility model relates to a needle flame test device based on machine vision to identify flame height, wherein machine vision is a recognition technology that obtains a target image through a camera and obtains a recognition result through database matching, also known as image processing technology, which can be selected in the prior art. For example, a patent document entitled "A tread detection method based on machine vision" describes a method of using a camera and image processing technology to detect the size of a rubber tire (parameters such as shape, size, height and axis). Similar to the image processing technology, the utility model only needs a camera to obtain a flame image during the test and then match it with a flame height database to quickly and accurately obtain the flame height.

[0026] like Figure 1 As shown, a needle flame testing device 1 for identifying flame height based on machine vision may include: a studio 11 , a sample fixing mechanism 12 , a needle flame mechanism 13 and at least one camera 15 .

[0027] In some examples, the sample fixing mechanism 12 is disposed at a first position in the working room 11 and the sample fixing mechanism 12 can move toward a second position in the working room 11 .

[0028] In some examples, the needle flame mechanism 13 can be movably disposed in the second position.

[0029] In some examples, at least one camera 15 is disposed in the working chamber 11 and is used to obtain an image of the flame generated by the needle-flame mechanism 13 .

[0030] In the present invention, the height of the needle flame (flame height for short) can be quickly and accurately obtained based on machine vision after the flame image is acquired by the camera 15, and the possible dangerous factors brought by manual measurement can be reduced.

[0031] In some examples, such as Figure 1 or Figure 2 As shown, a control system 14 is also included. Figure 2 As shown, the control system 14 includes a first control module 141 , a second control module 142 and a third control module 143 .

[0032] In some examples, the first control module 141 can control the sample fixing mechanism 12 to move from the first position to the second position (eg, Figure 1 D direction), the second control module 142 can control the flame state of the needle flame mechanism 13, and the third control module 143 can control at least one camera 15 to obtain a flame image and output the flame height of the needle flame mechanism 13 based on the flame image and the flame height database. In this case, the first control module 141 controls the movement of the sample fixing mechanism 12 to facilitate moving the sample 2 to the designated test location, the second control module 142 controls the flame state to facilitate operations such as ignition, flame off and adjustment according to the test requirements during the test, and the third control module 143 controls the camera 15 and obtains the flame height according to the image of the camera 15 to improve the intelligence of the equipment, thereby improving the accuracy and efficiency of the needle flame test through the three control modules.

[0033] In some examples, such as Figure 3 As shown, the flame height database can contain multiple known flame images, each image is different and corresponds to its own flame height parameter. For example, No. 1 corresponds to a flame height of d1 (e.g. 1 cm), and then increases in sequence by d2 (e.g. 1 mm). No. 2 corresponds to 1.1 cm, and ... No. N corresponds to 1cm+(N-1)*1mm.

[0034] In some examples, such as Figure 4As shown, the flame height database may only include one known flame image, called the calibration image. The flame height of the calibration image is d1 (for example, 1 cm) and the distance d3 from the imaging center of the camera 15 is known. Then, the angle α between the flame height and the imaging center of the camera 15 can be calculated. By acquiring the flame image during the test and the angle α between the flame height during the test and the imaging center of the camera 15, the difference between the flame height of the test flame image and the calibration image can be obtained after geometric calculation. Therefore, the flame height of the test flame image is the difference + the flame height of the calibration image.

[0035] In some examples, such as Figure 1 As shown, the sample fixing mechanism 12 may include a fixing column 121, a positioning portion 122 and a clamping portion 123, the fixing column 121 may be movably arranged at a first position, the positioning portion 122 may be slidably arranged on the fixing column 121, and the clamping portion 123 may be arranged on the positioning portion 122 and used to clamp and fix the sample 2 to be tested. In this case, when performing the needle flame test, the sample 2 to be tested may be clamped and fixed by the clamping portion 123 according to the test requirements, such as the relative position of the sample 2 to be tested and the needle flame, and the position and height of the sample 2 to be tested may be adjusted by the positioning portion 122, and finally the sample 2 to be tested may be moved to the vicinity of the needle flame by the fixing column 121 to complete the needle flame test, thereby improving the flexibility of the device.

[0036] In some examples, such as Figure 1 As shown, the sample fixing mechanism 12 is arranged in the working room 11 via a slide rail 111. In this case, it is convenient to transport the sample 2 to be tested.

[0037] In some examples, the sample fixing mechanism 12 can be manually driven, and the slide rail 111 is provided with a scale. When the sample fixing mechanism 12 is manually driven to move, the sample 2 to be tested can be transported to the test point (such as Figure 1 The location of the sample fixing mechanism 12 indicated by the dotted line is convenient for testing.

[0038] In other examples, the sample fixing mechanism 12 may be driven by a motor, and the motor may move the sample fixing mechanism 12 to a position where the sample 2 to be tested is exactly located at the test point (eg, Figure 1 The sample fixing mechanism 12 is located at the position indicated by the dotted line).

[0039] In some examples, such as Figure 1 As shown, the studio 11 may be in a box shape, and the studio 11 may include a base 112, a shell 113, and a filter 114 disposed on the shell 113. In this case, the shell 113 can protect the mechanism in the studio 11, the base 112 can facilitate the installation of various mechanisms and improve the center of gravity stability of the device, and the filter 114 can filter the gas after the needle flame test to reduce environmental pollution.

[0040] In some examples, such as Figure 1 As shown, the fixing column 121 is arranged on the base 112 through the slide rail 111. In this case, it is convenient to transport the sample 2 to the test point through the fixing column 121 of the sample fixing mechanism 12.

[0041] In some examples, such as Figure 1 As shown, the control system 14 further includes a human-machine interface 144, which is disposed on the outer surface of the housing 113. In this case, it is convenient for operators to operate, while reducing the danger of operators entering the studio 11 for operation.

[0042] In some examples, such as Figure 1 As shown, the needle flame mechanism 13 includes a fixing rod 131, an igniter 132, a combustion gas source 133 and a needle-shaped burner 134. The fixing rod 131 is arranged on the base 112. The igniter 132 is used to ignite the burner 134, and the burner 134 is used to continuously generate flames. In this case, the needle flame mechanism 13 can simulate various different flames to test the sample 2 to be tested.

[0043] In some examples, the burner 134 is tilted at a 45° angle, the igniter 132 is arranged near the needle tip end of the burner 134, the combustion gas source 133 is connected to the burner 134 through a gas pipe, the combustion gas source 133 is arranged outside the shell 113, and the gas of the combustion gas source 133 includes acetylene, propylene and butane. In this case, the burner 134 is tilted at a 45° angle, which can reduce the loss of the burner 134 caused by the combustion of the sample 2 to be tested, and at the same time make the needle flame have the same flame shape as the vertically formed needle flame. The combustion gas source 133 is arranged outside the shell 113 to improve the safety of the equipment.

[0044] In some examples, such as Figure 4 As shown, the imaging center of at least one camera 15 is arranged at the same height as the needle tip of the burner 134. In this case, the needle flame can be calibrated to make a flame height database and accurately obtain the flame height during testing.

[0045] The embodiments described above are only preferred implementation modes of the present utility model and cannot be used to limit the protection scope of the present utility model. Any non-substantial changes and modifications made by technicians in this field on the basis of the utility model shall fall within the protection scope of the present utility model.

Claims

1. A needle flame test device based on machine vision to identify flame height, wherein the machine vision is a recognition technology that obtains a target image through a camera and obtains a recognition result through database matching, characterized in that: include: A studio, a sample fixing mechanism, a needle-flame mechanism and at least one camera, wherein the sample fixing mechanism is arranged at a first position in the studio and the sample fixing mechanism can move toward a second position in the studio, the needle-flame mechanism can be movably arranged at the second position, and the at least one camera is arranged in the studio and used for acquiring a flame image generated by the needle-flame mechanism.

2. The needle flame test device based on machine vision flame height recognition according to claim 1, characterized in that: The sample fixing mechanism is arranged in the working room via a slide rail.

3. The needle flame test device based on machine vision flame height recognition according to claim 1, characterized in that: The working room is box-shaped and comprises a base, a shell and a filter arranged on the shell.

4. The needle flame test device based on machine vision flame height recognition according to claim 3 is characterized in that: The sample fixing mechanism comprises a fixing column, a positioning part and a clamping part. The fixing column can be movably arranged at the first position. The positioning part can be slidably arranged on the fixing column. The clamping part is arranged on the positioning part and is used to clamp and fix the sample to be tested.

5. The needle flame test device based on machine vision recognition of flame height according to claim 4 is characterized in that: The fixing column is arranged on the base through a slide rail.

6. The needle flame test device based on machine vision recognition of flame height according to claim 3, characterized in that: It also includes a control system, which includes a first control module for controlling the movement of the sample fixing mechanism from the first position to the second position, a second control module for controlling the flame state of the needle flame mechanism, and a third control module for controlling the at least one camera to acquire the flame image and output the flame height of the needle flame mechanism based on the flame image and a flame height database.

7. The needle flame test device based on machine vision flame height recognition according to claim 6, characterized in that: The control system further comprises a human-machine interaction interface, and the human-machine interaction interface is arranged on the outer surface of the shell.

8. The needle flame test device based on machine vision flame height recognition according to claim 3, characterized in that: The needle flame mechanism comprises a fixing rod, an igniter, a combustion gas source and a needle-shaped burner, wherein the fixing rod is arranged on the base, the igniter is used for igniting the burner, and the burner is used for continuously generating flames.

9. The needle flame test device based on machine vision flame height recognition according to claim 8, characterized in that: The burner is tilted at an angle of 45°, the igniter is arranged close to the needle tip end of the burner, the combustion gas source is connected to the burner through a gas pipe, the combustion gas source is arranged outside the shell, and the gas of the combustion gas source includes acetylene, propylene and butane.

10. The needle flame test device based on machine vision recognition of flame height according to claim 8, characterized in that: The imaging center of the at least one camera is arranged at the same height as the needle tip of the burner.

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