Electronic reinforcing steel bar auxiliary mounting device

Abstract

The utility model provides an electronic reinforcing steel bar auxiliary installation device which comprises a handle, a screw head detection part used for detecting position information of a screw thread line of a screw head is arranged at the top of the handle, and an axial distance detection part used for detecting axial information of the screw head is arranged on the side face of the screw head detection part. The thread position information of the reinforcing steel bar thread heads can be detected through the thread head detection part, so that virtual thread alignment is performed by comparing the thread positions of the two butt-joint reinforcing steel bar thread heads, meanwhile, the thread positions of the reinforcing steel bars can be adjusted according to the virtual thread alignment difference, and in addition, the axial distance of the reinforcing steel bar thread heads can be detected through the axial distance detection part; by means of the device, in-situ continuous steel bar manufacturing work can be achieved, pre-matching between the steel bars is not needed, and therefore the manufacturing method that traditional straight thread connection needs long line or short line matching can be replaced, the workshop steel bar machining site is saved, and the production efficiency is improved. And the construction efficiency and quality are greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of steel bar butt joint, in particular to an electronic steel bar auxiliary installation device. Background Technique

[0002] For the butt joint of steel bars in the upper and lower segments of prefabricated steel bar meshes, mechanical connection methods are generally adopted. At present, the more commonly used steel bar connectors mainly include straight thread sleeves, straight extrusion sleeves, tapered extrusion sleeves, etc. Due to the low cost and high installation efficiency of straight thread sleeves, they are widely used. The connection of straight thread sleeves needs to meet two conditions. One is the high-precision positioning of steel bars, and the other is the matching of steel bar threads. It is generally suitable for the loose binding connection of single steel bars. When applying straight threads in prefabricated steel bar meshes, pre-matching connection generally needs to be carried out first, and short-line or long-line matching methods are used for in-factory matching production. After untying the pre-connected sleeve, the whole installation is carried out on site. The short-line matching method is prefabricated through two workstations. Before the production of the lower segment steel bar mesh, the upper segment needs to be hoisted to the matching workstation to reserve the prefabrication workstation, which has problems such as cumbersome process, poor positioning accuracy, and low construction efficiency. The long-line matching method generally uses multiple workstations for matching prefabrication, which occupies a large construction site and has a relatively high comprehensive cost. Therefore, a non-matching construction method for straight thread-connected steel bar meshes is proposed to solve the above problems. Content of the Utility Model

[0003] The main purpose of the utility model is to provide an electronic steel bar auxiliary installation device, which solves the problem that the straight thread-connected steel bar mesh cannot be fabricated in situ and needs pre-matching connection.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is an electronic steel bar auxiliary installation device, which includes a handle. At the top of the handle, there is a thread head detection part for detecting the position information of the thread lines of the thread head, and on the side of the thread head detection part, there is an axial distance detection part for detecting the axial information of the thread head;

[0005] The thread head detection part includes a housing. At the front end of the housing, there is a perforation for inserting the steel bar thread head. Inside, there is a detection cavity with a trapezoidal cross-section. On the top and two inclined surfaces of the detection cavity, there are detection cameras, and the shooting ends of the three detection cameras face the center position of the detection cavity;

[0006] Outside the perforation, there is a three-jaw automatic chuck for clamping the steel bar thread head.

[0007] In the preferred solution, a lighting lamp is further arranged at the bottom of the detection cavity.

[0008] In the preferred solution, the axial distance detection part is a laser rangefinder.

[0009] In the preferred solution, the number of axial distance detection parts is two, which are symmetrically arranged on both sides of the housing.

[0010] In the preferred embodiment, a contact platform for contacting the end of the steel wire head is also provided inside the shell, the contact platform corresponds to the perforation, and a pressure sensor electrically connected to the three-jaw automatic chuck is embedded therein.

[0011] In a preferred embodiment, an encoder for recording the rotation angle is provided on the motor of the three-jaw automatic chuck.

[0012] In a preferred embodiment, a touch display is also provided on the back side of the housing.

[0013] The utility model provides an electronic steel bar auxiliary installation device, which can detect the thread position information of the steel bar thread head through a thread head detection part, so as to perform virtual thread alignment by comparing the thread positions of two butted steel bar thread heads, and adjust the steel bar thread position according to the virtual thread alignment difference. In addition, the axial distance of the steel bar thread head can be detected by an axial distance detection part, so as to compare the axial distance difference of the two butted steel bar thread heads and adjust the axial distance of the steel bars. Through this device, continuous steel bar production work can be carried out in situ without pre-matching between steel bars, thereby replacing the traditional straight thread connection requiring long or short line matching production method, saving workshop steel bar processing space, and greatly improving construction efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 This is a structural diagram of the electronic steel bar auxiliary installation device of the present invention;

[0016] Figure 2 The present invention Figure 2 Another perspective structure diagram;

[0017] Figure 3 It is a cross-sectional view of the cross-sectional structure of the detection cavity of the present invention;

[0018] Figure 4 This is a cross-sectional view of the side structure of the detection cavity of the present invention;

[0019] In the figure: handle 1; wire head detection part 2; housing 201; detection camera 202; lighting lamp 203; abutment table 204; perforation 205; detection cavity 206; touch display 3; axial distance detection part 4; three-jaw automatic chuck 5. DETAILED DESCRIPTION

[0020] Example 1

[0021] like Figures 1-4As shown in the figure, an electronic auxiliary device for installing steel bars includes a handle 1. At the top of the handle 1, a thread head detection part 2 is provided for detecting the position information of the thread lines of the thread head. On the side of the thread head detection part 2, an axial distance detection part 4 is provided for detecting the axial information of the thread head.

[0022] In a preferred embodiment, the thread head detection part 2 includes a housing 201. At the front end of the housing 201, a perforation 205 for inserting the steel bar thread head is provided. Inside, a detection cavity 206 with a trapezoidal cross-section is arranged. The detection cavity 206 is an isosceles trapezoid that is wider at the top and narrower at the bottom. On the top and two inclined surfaces of the detection cavity 206, detection cameras 202 are arranged. The shooting ends of the three detection cameras 202 face the center position of the detection cavity 206, so that the steel bar thread head inserted into the detection cavity 206 can be photographed from three different angles. At the bottom of the detection cavity 206, a lighting lamp 203 is also provided for providing the lighting required for shooting. The lighting lamp 203 is an LED lamp.

[0023] To detect the position information of the thread lines of the steel bar thread head, the present invention uses three detection cameras 202 and one lighting lamp 203 to form a trapezoidal thread head detection part 2. The lighting lamp 203 is placed at the bottom, and the three detection cameras 202 are distributed on the other sides. Images of the steel bar thread head are obtained through the three detection cameras 202, and the radial angle of the thread lines of the steel bar thread head is calculated through image processing technology, so as to achieve the effect of obtaining the position information of the thread lines of the thread head.

[0024] The method includes:

[0025] S21. Image acquisition, obtaining images of the steel bar thread head from three cameras.

[0026] S22. Image preprocessing, first performing grayscale processing on the obtained images to convert the color images into grayscale images, then denoising the images to remove the noise in the images, and finally performing edge detection to extract the edges in the images.

[0027] S23. Feature extraction, using the longitudinal ribs on the outer surface of the steel bar as marker points. First, perform longitudinal rib positioning. By transforming the detection lines, find the line representing the longitudinal rib, and select the longest or most obvious line from all the detected lines as the line representing the rib. Then, perform thread head center positioning. Use contour detection to find the contour of the thread head, and calculate the centroid of the contour as the thread head center.

[0028] S24. Angle calculation, calculating the angle between the longitudinal rib and the thread head center, and calculating the angle of the rib relative to the thread head center through geometric methods.

[0029] It should be noted that when the steel bar thread head is inserted into the detection cavity 206, some steel bar rib segments are also inserted therein, which is convenient for extracting the longitudinal ribs of the steel bar as marker points.

[0030] In the preferred solution, the formula used for image preprocessing in step S22 is:

[0031] gray = 0.2989 * R + 0.5870 * G + 0.1140 * B;

[0032] where gray is the grayscale image, and R, G, and B are the red, green, and blue components of the image respectively. This formula converts the RGB image into a grayscale image, and the coefficients 0.2989, 0.5870, and 0.1140 are weighted according to the standard values of the human eye's sensitivity to different colors.

[0033] For denoising, the Gaussian blur formula is used, specifically:

[0034] blurred = GaussianBlur(gray, kernel_size, sigma);

[0035] where blurred is the image after Gaussian blur processing, kernel_size is the size of the Gaussian kernel, usually an odd number such as 3, 5, etc., and sigma is the standard deviation, which determines the degree of blur.

[0036] For edge detection, the Canny edge detection algorithm is used, and the formula is:

[0037] edges = Canny(blurred, low_threshold, high_threshold);

[0038] where edges is the detected edge image, low_threshold is the low threshold, and pixels below this threshold are considered less likely to be edges, while high_threshold is the high threshold, and pixels above this threshold are considered more likely to be edges.

[0039] In the preferred solution, for the transform detection line of feature extraction in step S23, Hough is used, and the specific formula is:

[0040] lines = HoughLinesP(edges, rho, theta, threshold, minLineLength, maxLineGap);

[0041] Among them, lines is the list of detected lines, rho is the distance resolution, usually set to 1, theta is the angle resolution, usually set to np.pi / 180 (i.e., 1 degree), threshold is the minimum number of votes, indicating how many points are required to support a line at least to be detected, minLineLength is the minimum line segment length, and maxLineGap is the maximum line gap. If the gap between two lines is less than this value, they are considered to belong to the same line.

[0042] The formula for contour detection is:

[0043] contours,_=findContours(edges,mode,method);

[0044] Among them, contours is the list of detected contours, _ is the contour hierarchy, usually not used, mode is the contour retrieval mode. For example, cv2.RETR_EXTERNAL only retrieves the outermost contours, and method is the contour approximation method. For example, cv2.CHAIN_APPROX_SIMPLE compresses the elements in the horizontal, vertical, and diagonal directions and only retains the endpoints.

[0045] The formula for angle calculation is:

[0046] M=moments(contour);

[0047] cx=M['m10'] / M['m00'];

[0048] cy=M['m01'] / M['m00'];

[0049] Among them, M is the moment of the contour, cx is the x coordinate of the centroid of the contour, cy is the y coordinate of the centroid of the contour, m10 is the first moment of the contour, indicating the moment of the contour in the x-axis direction, m01 is the first moment of the contour, indicating the moment of the contour in the y-axis direction, and m00 is the zero-order moment of the contour, indicating the area of the contour.

[0050] In the preferred solution, the specific calculation method for the angle between the longitudinal rib and the center of the wire head in step S24 is:

[0051] S241. Extract the two endpoints of the longitudinal rib: Extract two endpoints x1, y1 and x2, y2 from the selected line representing the rib.

[0052] S242. Calculate the angle between the longitudinal rib and the horizontal direction. The formula is:

[0053] angle=atan2(dy,dx);

[0054] Where dx is the horizontal displacement of the rib, equal to x2 - x1, dy is the vertical displacement of the rib, equal to y2 - y1, and angle is the angle between the rib and the horizontal direction.

[0055] S243. Calculate the relative position between the rib and the center of the wire head, and calculate the relative position between the starting point of the longitudinal rib and the center of the wire head. The formula is:

[0056] relative_x = cx - x1;

[0057] relative_y = cy - y1.

[0058] S244. Calculate the angle between the rib and the center of the wire head. The formula is

[0059] rib_angle = atan2(relative_y, relative_x).

[0060] Where relative_x: the horizontal distance between the starting point of the rib and the center of the wire head, relative_y: the vertical distance between the starting point of the rib and the center of the wire head, rib_angle: the angle between the rib and the center of the wire head.

[0061] By this method, the radial angles of the thread lines of the two steel bar wire heads can be measured, the radial angle difference between the two can be obtained, and then it can be judged whether the two steel bar wire heads are aligned. And the steel bars can be adjusted according to the radial angle difference, so as to achieve an accurate wire matching effect for the two steel bar wire heads.

[0062] In the preferred solution, the axial distance detection part 4 is a laser rangefinder. After the device is sleeved outside the steel bar wire head, the axial distance of the steel bar wire head is measured with the tire rack as the target. According to the axial distance difference between the two steel bar wire heads, it is judged whether the axials of the two steel bar wire heads are aligned, and the steel bars can be adjusted according to the axial distance difference. Setting the axial distance detection part 4 on the side can avoid the obstruction of the steel bar to the measurement. In this embodiment, the number of the axial distance detection parts 4 is two, which are symmetrically arranged on both sides of the housing 201, so as to improve the accuracy of axial measurement.

[0063] It should be noted that when the tire rack is not convenient to be used as the measurement target, a measurement target can be fixedly arranged in front of the tire rack.

[0064] Through the above method, the steel bar production can be completed at the original work station. While ensuring accurate wire matching, the butt joint distance is guaranteed, the process of the short wire matching method that requires the overall movement of the steel bar mesh is saved, the work efficiency is improved, and the problem that the long wire matching method requires a large amount of prefabrication sites is solved.

[0065] In a preferred embodiment, an abutting platform 204 for abutting against the end of the steel bar thread is further provided inside the housing 201. The abutting platform 204 corresponds to the perforation 205. A three-jaw automatic chuck 5 is provided outside the perforation 205. A pressure sensor electrically connected to the three-jaw automatic chuck 5 is embedded in the abutting platform 204.

[0066] During use, when the end of the steel bar thread is inserted into the detection cavity 206 through the perforation 205 and abuts against the pressure sensor on the abutting platform 204, the three-jaw automatic chuck 5 is triggered to clamp the steel bar, thereby ensuring that the steel bar is located at the center of the detection cavity 206, ensuring that the shooting distances between the three detection cameras 202 are the same, improving the measurement accuracy, and at the same time, the three-jaw automatic chuck 5 can adapt to steel bars of different diameters.

[0067] It should be noted that the three-jaw automatic chuck 5 is an ordinary motor-driven chuck, which is a prior art, so it will not be described in detail here.

[0068] In a preferred embodiment, an encoder is provided on the motor of the three-jaw automatic chuck 5 for recording the rotation angle, so as to calculate the diameter of the steel bar. The calculation formula is:

[0069]

[0070] Where D is the diameter of the steel bar, L is the fixed arm length of the three-jaw disc (the distance from the rotation center to the end of the three-jaw disc), and θ is the rotation angle of the three-jaw disc, which is measured by the encoder.

[0071] In a preferred embodiment, a touch display 3 is further provided on the back of the housing 201 for operating and displaying the device.

[0072] It should be noted that the touch display 3 is provided with devices such as a processor and a storage for implementing the above method, which can record and calculate the detection results, and at the same time record the steel bar position number, such as several columns and several rows. A power supply for power supply is provided in the handle 1, which is a common technical means in this field, so it will not be described in detail here.

[0073] Embodiment 2

[0074] Combined with Embodiment 1 for further explanation, a construction method for a straight thread-connected steel bar mesh without matching includes:

[0075] S1. Fabricate the first steel bar mesh. Install the transverse bars and longitudinal bars of the steel bar mesh in the positioning slots of the jig according to the design requirements, and then tie the placed steel bar mesh.

[0076] S2. Detect and record the steel bar threads. Detect the threads at the tails of the longitudinal bars and / or transverse bars of the fabricated steel bar mesh to obtain their axial information and the position information of the thread lines of the threads, and record them. Then lift the first steel bar mesh from the jig.

[0077] S3, making the next steel mesh, placing the transverse and longitudinal bars of the steel mesh in the positioning slots of the tire frame in sequence, and in the process of placing, copying the information recorded in step S2 to the end wire heads of the transverse and / or longitudinal bars, and guiding the positioning and installation of the steel bars through the information, ensuring that the steel mesh can match the wire head information of the previous steel mesh, thereby achieving a pre-matching effect;

[0078] S4. Repeat steps S2-S3 until all the steel meshes are made.

[0079] In the preferred embodiment, the specific method for completing the detection and recording of the steel bar thread heads in step S2 by the electronic steel bar auxiliary installation device is: the thread head detection part 2 is mounted on the outside of the thread heads at the tail of the longitudinal reinforcement and / or transverse reinforcement of the manufactured steel mesh, and the thread head detection part 2 is used to determine and record the thread line position information of the steel bar thread head, and then the axial distance detection part 4 on the thread head detection part 2 is used to measure and record the axial distance between the steel bar thread head and the frame.

[0080] The specific method for guiding the positioning and installation of the steel bars in step S3 is: during the process of placing the steel bars, the electronic steel bar auxiliary installation device is installed on the end of the steel bar that needs to be connected, and its thread position information and axial distance are measured, and compared with the data of the tail of the connected steel bar, and the radial angle of the steel bar thread and the axial distance of the steel bar end are adjusted according to the data difference.

[0081] The utility model adopts a construction method of non-matching straight threaded steel bar components. Compared with the traditional steel bar construction method, there is no need for manual handling of steel bars, which greatly reduces labor intensity. The assembled overall installation improves the on-site steel bar construction efficiency by 50%. Compared with short-line or long-line matching production that requires a large amount of space, this technology can save 50%-80% of the steel bar prefabrication site area and improve the in-factory production efficiency by 30%.

[0082] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An electronic steel bar auxiliary installation device, characterized in that: It comprises a handle (1), wherein a wire head detection portion (2) for detecting the position information of the wire head thread line is arranged on the top of the handle (1), and an axial distance detection portion (4) for detecting the axial information of the wire head is arranged on the side of the wire head detection portion (2); The wire head detection unit (2) comprises a housing (201), the front end of the housing (201) is provided with a through hole (205) for inserting a steel wire head, a detection cavity (206) with a trapezoidal cross section is provided inside, and detection cameras (202) are provided on the top and two inclined surfaces of the detection cavity (206), and the shooting ends of the three detection cameras (202) face the center of the detection cavity (206); A three-jaw automatic chuck (5) for tightening the steel wire head is arranged outside the perforation (205).

2. According to claim 1, the electronic steel bar auxiliary installation device is characterized in that: An illumination lamp (203) is also provided at the bottom of the detection cavity (206).

3. According to claim 1, the electronic steel bar auxiliary installation device is characterized in that: The axial distance detection unit (4) is a laser rangefinder.

4. According to claim 3, the electronic steel bar auxiliary installation device is characterized in that: There are two axial distance detection parts (4), which are symmetrically arranged on both sides of the housing (201).

5. The electronic steel bar auxiliary installation device according to claim 1 is characterized in that: The housing (201) is also provided with a contact platform (204) for contacting the end of the steel wire head. The contact platform (204) corresponds to the perforation (205) and is embedded with a pressure sensor electrically connected to the three-jaw automatic chuck (5).

6. The electronic steel bar auxiliary installation device according to claim 1 or 5, characterized in that: The motor of the three-claw automatic chuck (5) is provided with an encoder for recording the rotation angle.

7. The electronic steel bar auxiliary installation device according to claim 1 is characterized in that: A touch display (3) is also provided on the back of the housing (201).

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