Circular saw blade swing detection device and method

Abstract

According to the circular saw blade swing detection device and method, the swing amplitude of the saw blade is monitored in real time through on-line detection of the width of a downstream cutting seam of the saw blade, when the saw blade swings or swings to a certain amplitude, a controller can give an alarm in time to warn a user to check the saw blade in time, the problem of swing of the saw blade is solved, and the safety of the saw blade is improved. The saw blade is prevented from being further damaged, so that the service life of the saw blade is prolonged, and the use safety of the saw blade is improved.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and in particular relates to a circular saw blade swing detection device and method. Background Art

[0002] A circular saw is a cutting tool that is widely used for cutting panels. Its main working part is the saw blade. When the saw blade rotates at high speed to cut materials, it may swing due to heat deformation, loose connections, blade blunting and other reasons. This shaking phenomenon is relatively slight in the early stages and is difficult for users to detect. However, this shaking will accelerate the damage of the saw blade, shorten the life of the saw blade, and even cause the saw blade to break and splash. Therefore, the swing of the saw blade poses a great safety hazard and needs to be discovered and corrected in a timely manner to prevent it from happening. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a circular saw blade swing detection device to solve the technical problem that the saw blade swing phenomenon is difficult for users to detect in the early stage, resulting in a shortened saw blade life and increased safety risks.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a circular saw blade swing detection device, including a digital camera, which is installed on the bottom plate of the circular saw. The digital camera is located directly behind the saw blade and is used to capture the image of the cutting seam. The digital camera is electrically connected to the controller of the circular saw and sends the captured picture to the controller. The controller is connected to an alarm to control the alarm to sound an alarm.

[0005] As a preferred solution, a shooting hole is provided on the bottom plate, which is located just behind the saw blade. The width of the shooting hole is greater than the thickness of the saw blade. The cutting seam formed by the saw blade cutting the material is located just below the shooting hole. The end of the shooting hole close to the material is closed by a transparent sealing plate, and the digital camera is installed on the bottom plate above the sealing plate or in the shooting hole.

[0006] As a preferred solution, the alarm is a warning light.

[0007] The second technical problem to be solved by the present invention is to provide a circular saw blade swing detection method to solve the technical problem that the saw blade swing phenomenon is difficult to be detected by the user in the early stage, resulting in a shortened saw blade life and increased safety risks.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a circular saw blade swing detection method, using the above circular saw blade swing detection device, comprising the following specific steps: a. Preset the thickness of the circular saw blade and the normal width and tolerance of the cutting seam to the controller; b. When cutting materials, the controller controls the digital camera to take pictures of the cutting seam at a set frequency, and sends the pictures to the controller after being numbered in sequence; c. The controller calculates the actual width of the cutting seam based on the photo and compares it with the preset normal width. When the actual width of the cutting seam is greater than the sum of the normal width and the positive tolerance, the controller controls the alarm to sound.

[0009] As a preferred solution, the pictures taken by the digital camera are binary images.

[0010] As a preferred solution, in step c, when the actual width of the cutting seam corresponding to N consecutive cutting seam photos is greater than the normal width, the controller controls the alarm to sound, and N can be set according to the detection accuracy. The smaller N is, the higher the detection accuracy is, and the larger N is, the lower the detection accuracy is, and N≥1.

[0011] As a preferred solution, in step c, when the actual width of the cutting seam is greater than the sum of the normal width and the positive tolerance by M, the controller controls the alarm to sound. M can be set according to the detection accuracy. The smaller M is, the higher the detection accuracy is, and the larger M is, the lower the detection accuracy is, M>0.

[0012] The beneficial effects of the present invention are as follows: the present invention monitors the swing amplitude of the saw blade in real time through online detection of the width of the cutting seam downstream of the saw blade. When the saw blade swings or the swing reaches a certain amplitude, the controller can promptly issue an alarm to alert the user to check the saw blade in time, thereby eliminating the problem of saw blade swinging and avoiding further damage to the saw blade, thereby extending the service life of the saw blade and improving the safety of the saw blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein: Figure 1 is a front view of the circular saw blade swing detection device of the present invention; Figure 2 is a side elevation view of the circular saw blade swing detection device of the present invention; Figure 3 is a schematic diagram of the circular saw blade swing detection device of the present invention; Figure 1~Figure 3 Middle: 1. Digital camera; 2. Bottom plate; 3. Saw blade; 4. Controller; 5. Alarm; 6. Shooting hole; 7. Cover plate. DETAILED DESCRIPTION

[0014] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0015] like Figure 1~Figure 3The circular saw blade swing detection device shown includes a digital camera 1, which is installed on the circular saw base plate 2. The digital camera 1 is located directly behind the saw blade 3 and is used to capture the image of the cutting seam. The digital camera 1 is electrically connected to the controller 4 of the circular saw and sends the captured image to the controller 4. The controller 4 is connected to an alarm 5 to control the alarm 5 to sound an alarm.

[0016] When the circular saw is cutting the material, the controller 4 controls the digital camera 1 to take a picture of the cutting seam at a speed of one picture per second, and sends the picture to the controller 4 after taking the picture. The controller 4 processes the picture to obtain the width of the cutting seam.

[0017] The method in which the controller 4 processes the photo to obtain the width of the cutting seam is a conventional image processing method. The controller only needs to extract the boundary of the cutting seam and then calculate the number of pixels between the two boundaries. The width of the cutting seam can be calculated based on the width of each pixel. This method belongs to conventional technology and will not be described here.

[0018] In this embodiment, a shooting hole 6 is preferably opened on the bottom plate, and the shooting hole 6 is just located behind the saw blade 3. The width of the shooting hole 6 is greater than the thickness of the saw blade 3. The cutting seam formed by the saw blade 3 cutting the material is located directly below the shooting hole 6. The end of the shooting hole 6 close to the material is closed by a transparent sealing plate 7, and the digital camera 1 is installed in the shooting hole 6 above the sealing plate 7.

[0019] In practical applications, the digital camera 1 can also be installed on the base 2 above the cover plate 7 and can be photographed directly facing the photographing hole 6 .

[0020] The shooting hole 6 can make the contrast between the cutting seam and the material in the photographed photo greater, which is convenient for the controller 4 to extract the boundary of the cutting seam and reduces the calculation amount of the controller 4.

[0021] The alarm 5 shown in this embodiment is preferably a warning light, because the circular saw produces a certain noise when working, and the warning light is not affected by the noise.

[0022] The method for detecting saw blade swing using the circular saw saw blade swing detection device comprises the following specific steps: a. Preset the thickness of the circular saw blade 3 and the normal width and tolerance of the cutting seam to the controller 4; b. When cutting the material, the controller 4 controls the digital camera 1 to take pictures of the cutting seam at a set frequency, and sends the pictures to the controller 4 after being numbered in sequence; c. The controller 4 calculates the actual width of the cutting seam according to the photo and compares it with the preset normal width. When the actual width of the cutting seam is greater than the sum of the normal width and the positive tolerance, the controller 4 controls the alarm 5 to sound an alarm.

[0023] The picture taken by the digital camera is preferably a binary image, so that the controller 4 can directly extract the cutting seam boundary and calculate the cutting seam width based on the binary image, which greatly reduces the processing workload of the controller 4 on the picture and improves the detection speed of the controller 4 on the cutting seam width.

[0024] In step c, when the actual width of the cutting seam corresponding to N consecutive cutting seam photos is greater than the normal width, the controller 4 controls the alarm 5 to alarm. N can be set according to the detection accuracy. The smaller N is, the higher the detection accuracy is, and the larger N is, the lower the detection accuracy is, N≥1.

[0025] In step c, when the actual width of the cutting seam is greater than the sum of the normal width and the positive tolerance by M, the controller 4 controls the alarm 5 to sound an alarm. M can be set according to the detection accuracy. The smaller M is, the higher the detection accuracy is. The larger M is, the lower the detection accuracy is. M>0.

[0026] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A circular saw blade swing detection device, characterized in that: It includes a digital camera, which is installed on the bottom plate of the circular saw. The digital camera is located directly behind the saw blade and is used to shoot the image of the cutting seam. The digital camera is electrically connected to the controller of the circular saw and sends the captured image to the controller. The controller is connected to an alarm to control the alarm to sound an alarm.

2. The circular saw blade swing detection device according to claim 1, characterized in that: A shooting hole is provided on the bottom plate, which is located just behind the saw blade. The width of the shooting hole is greater than the thickness of the saw blade. The cutting seam formed by the saw blade cutting the material is located just below the shooting hole. The end of the shooting hole close to the material is closed by a transparent sealing plate, and the digital camera is installed on the bottom plate above the sealing plate or in the shooting hole.

3. The circular saw blade swing detection device according to claim 1, characterized in that: The alarm is a warning light.

4. A circular saw blade swing detection method, using the circular saw blade swing detection device described in any one of claims 1 to 3, characterized in that: The specific steps include: a. Preset the thickness of the circular saw blade and the normal width and tolerance of the cutting seam to the controller; b. When cutting materials, the controller controls the digital camera to take pictures of the cutting seam at a set frequency, and sends the pictures to the controller after being numbered in sequence; c. The controller calculates the actual width of the cutting seam based on the photo and compares it with the preset normal width. When the actual width of the cutting seam is greater than the sum of the normal width and the positive tolerance, the controller controls the alarm to sound.

5. The circular saw blade swing detection method according to claim 4, characterized in that: The pictures taken by the digital camera are binary images.

6. The circular saw blade swing detection method according to claim 4, characterized in that: In step c, when the actual width of the cutting seam corresponding to N consecutive cutting seam photos is greater than the normal width, the controller controls the alarm to sound. N can be set according to the detection accuracy. The smaller N is, the higher the detection accuracy is, and the larger N is, the lower the detection accuracy is. N≥1.

7. The circular saw blade swing detection method according to claim 4, characterized in that: In step c, the controller controls the alarm to sound only when the actual width of the cutting seam is greater than the sum of the normal width and the positive tolerance by M. M can be set according to the detection accuracy. The smaller M is, the higher the detection accuracy is, and the larger M is, the lower the detection accuracy is, M>0.

Images