A steel bar size detection device based on machine vision

Abstract

The utility model relates to a steel bar size technical field discloses a steel bar size detection equipment based on machine vision, including operation platform, detection device, operation platform is used for installing clamping steel bar, detection device swing setting is in operation platform, clamping subassembly, clamping subassembly is used for fast clamping steel bar, and clamping subassembly includes installation frame, installation ring, movable ring and abutting block, and installation frame symmetry sets up on operation platform, and the bottom of every installation frame all is fixedly connected with fixed block, and every fixed block all is fixedly connected with operation platform, and every installation ring all is fixedly connected with installation frame, under the cooperation of clamping subassembly internal spare, through the steel bar of installation frame middle part and enter, and rotate movable ring fast complete the clamping locking of steel bar, avoided screw rod manpower rotation resulting in transmission efficiency low, resulting in clamping efficiency is affected technical problem, and the arc contact end of abutting block and the wall of steel bar fully stick together, and the friction of abutting block and steel bar is increased in inclined groove, and the effect of clamping is improved.

Description

Technical Field

[0001] This utility model belongs to the field of rebar size technology, specifically, it relates to a rebar size detection device based on machine vision. Background Technology

[0002] Hot-rolled ribbed steel bars are an important industrial material in modern production and are widely used in major infrastructure projects such as high-rise buildings, bridges, railways, and ports. With the significant increase in demand, if the dimensions of hot-rolled ribbed steel bars do not meet the requirements, it will cause huge economic and property losses.

[0003] A document with publication number (CN220871701U) discloses a machine vision-based device for measuring the dimensions of ribbed steel bars. The device includes a depth camera, a housing, two sets of drive modules, and two sets of clamping modules. Each set of drive modules is connected to the housing, and each set of clamping modules is connected to the housing. The depth camera is fixedly connected to the housing and located above it. By taking pictures of the specimen at different angles, the geometric model of the ribbed steel bar is reconstructed in three dimensions. All dimensions of the ribbed steel bar are measured on the model, thus realizing the measurement of the ribbed steel bar.

[0004] The aforementioned device clamps reinforcing bars using a screw thread drive. This method requires manual rotation from both sides, with the lateral rotation corresponding to the screw thread for clamping. This increases the number of clamping steps and reduces the efficiency of clamping the reinforcing bars.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] To solve the technical problem of rebar clamping, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A machine vision-based rebar size inspection device includes an operating table and an inspection device. The operating table is used to install and clamp the rebar. The inspection device is movably mounted on the operating table. A clamping assembly is used to quickly clamp the rebar. The clamping assembly includes a mounting frame, mounting rings, movable rings, and abutment blocks. The mounting frames are symmetrically arranged on the operating table. A fixing block is fixedly connected to the bottom of each mounting frame. Each fixing block is fixedly connected to the operating table. Each mounting ring is fixedly connected to the mounting frame. Each movable ring is rotatably connected to the mounting frame. The abutment blocks are arranged around the mounting frames. Each abutment block is drively connected to the corresponding movable ring.

[0008] In a preferred embodiment of this utility model, each of the abutting blocks is slidably connected to a movable block, and each movable block is slidably connected to a limiting groove, with the corresponding limiting groove being fixedly connected to the mounting ring.

[0009] In a preferred embodiment of this utility model, a transmission rod is provided between each movable block and the corresponding movable ring, and the end of each transmission rod is rotatably connected to the corresponding movable ring and movable block.

[0010] In a preferred embodiment of this utility model, each of the abutting blocks is fixedly connected to a sliding rod, each sliding rod is slidably connected to the movable block, and each sliding rod is fitted with a first spring.

[0011] In a preferred embodiment of the present invention, the end of each of the first springs is fixedly connected to the corresponding abutment block and movable block, and the clamping end of each movable block is arc-shaped, and the clamping end array is provided with inclined grooves.

[0012] In a preferred embodiment of this utility model, each of the movable blocks is alternately provided with abutting wheels, each abutting wheel is rotatably connected to the corresponding movable block, and each abutting wheel is provided with an inclined groove around its perimeter.

[0013] In a preferred embodiment of this utility model, each of the movable rings is fixedly connected to a movable toothed disc, each movable toothed disc is rotatably connected to the mounting frame, each movable toothed disc meshes with a limiting toothed disc, and each limiting toothed disc is elastically connected to the corresponding mounting frame.

[0014] In a preferred embodiment of this utility model, each of the limiting toothed discs is surrounded by a movable rod, each movable rod is fixedly connected to the corresponding limiting toothed disc, each movable rod is slidably connected to the corresponding mounting frame, and each movable rod is fitted with a second spring, the end of each second spring being fixedly connected to the corresponding limiting toothed disc and the mounting frame respectively.

[0015] In a preferred embodiment of this utility model, each of the limiting gears is symmetrically provided with an extension rod, each extension rod is fixedly connected to the limiting gear, each extension rod is slidably connected to the mounting frame, and each extension rod is fixedly connected with a pull rod.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This rebar size detection device based on machine vision, with the cooperation of internal components of the clamping assembly, inserts the rebar through the middle of the mounting frame and quickly completes the clamping and locking of the rebar by rotating the movable ring. This avoids the technical problem of low transmission efficiency caused by manual rotation of the screw, which affects the clamping efficiency. In addition, the arc-shaped contact end of the abutment block fully fits the wall surface of the rebar, and the inclined groove increases the friction between the abutment block and the rebar, improving the clamping effect.

[0018] 2. This machine vision-based rebar size inspection device uses two clamping methods, namely abutment blocks and abutment wheels, to meet the inspection of rebar under different conditions. When it is necessary to detect whether the shape is bent, the abutment wheel is used, and when only the size is to be detected, the abutment block is used to provide a more stable shooting effect.

[0019] 3. This rebar size detection device based on machine vision, after the clamping state is released, the tension on the pull rod is manually released, and the second spring applies deformation force to the limiting gear plate. The limiting gear plate is pushed to re-engage with the movable gear plate to perform self-locking, preventing the internal components from moving at will. The self-locking of the internal components can be released by a simple pull, thus releasing the clamping of the rebar.

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0021] In the attached diagram:

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the mounting frame structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure on the abutment block of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure between the gear discs of this utility model;

[0026] Figure 5 This is a schematic diagram of the abutment wheel structure of this utility model.

[0027] In the diagram: 1. Operating table; 11. Detection device; 12. Fixing block; 2. Mounting frame; 21. Mounting ring; 22. Movable ring; 3. Abutment block; 31. Slide rod; 32. First spring; 33. Movable block; 34. Limiting groove; 35. Transmission rod; 36. Abutment wheel; 4. Pull rod; 41. Extension rod; 42. Movable rod; 43. Second spring; 44. Limiting gear plate; 45. Movable gear plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0029] Please see Figure 1-5A machine vision-based rebar size inspection device includes an operating table 1, an inspection device 11, an operating table 1 for installing and clamping rebar, an inspection device 11 movably mounted on the operating table 1, and a clamping assembly for quickly clamping the rebar. The clamping assembly includes an installation frame 2, an installation ring 21, a movable ring 22, and an abutment block 3. The installation frames 2 are symmetrically arranged on the operating table 1. Each installation frame 2 has a fixed block 12 fixedly connected to its bottom. Each fixed block 12 is fixedly connected to the operating table 1. Each installation ring 21 is fixedly connected to the installation frame 2. Each movable ring 22 is rotatably connected to the installation frame 2. The abutment block 3 is arranged around the installation frame 2. Each abutment block 3 is drivenly connected to the corresponding movable ring 22. With the cooperation of the internal components of the clamping assembly, the rebar is inserted through the middle of the installation frame 2, and the movable ring 22 is rotated to quickly complete the clamping and locking of the rebar. This avoids the technical problem of low transmission efficiency caused by manual rotation of the screw, which affects the clamping efficiency.

[0030] It is worth noting that the operating table 1 and the detection device 11 have been fully disclosed in the document CN220871701U, which discloses a machine vision-based ribbed steel bar size measurement device. The operating table 1 corresponds to the chassis in the disclosed document, and the detection device 11 corresponds to the depth camera in the disclosed document. The depth camera is fixedly connected to the chassis and is located above the chassis. By taking pictures of the specimen at different angles, the geometric model of the ribbed steel bar is reconstructed in three dimensions, and all dimensions of the ribbed steel bar are measured on the model to realize the measurement of the ribbed steel bar. This will not be elaborated further here.

[0031] The detection system of detection device 11 processes images of steel bars taken at construction sites or centralized steel bar processing plants in batches using a computer. It extracts the HoughLines line detection function, the core of the HoughLines line detection machine vision algorithm, as the fundamental detection method. It fully utilizes the advantages of small code size, fast processing speed, ease of use, and good processing effect. Combined with three major modules—data format conversion module, size detection module, and external transmission and display module—it achieves the transformation and upgrading of steel bar size detection into automation and intelligence. While improving speed and accuracy, it effectively reduces the cost of manual inspection. The steel bar size detection method based on the HoughLines algorithm of detection device 11 has been disclosed in detail in the document with announcement number CN116524004B, and will not be repeated here.

[0032] Each abutment block 3 is slidably connected to a movable block 33, and each movable block 33 is slidably connected to a limiting groove 34. The corresponding limiting groove 34 is fixedly connected to the mounting ring 21. A transmission rod 35 is provided between each movable block 33 and the corresponding movable ring 22. The end of each transmission rod 35 is rotatably connected to the corresponding movable ring 22 and movable block 33. Each abutment block 3 is fixedly connected to a sliding rod 31, and each sliding rod 31 is slidably connected to the movable block 33. A first spring 32 is sleeved on each sliding rod 31, and the end of each first spring 32 is fixedly connected to the corresponding abutment block 3 and movable block 33. The clamping end of each movable block 33 is arc-shaped, and the clamping end array has inclined grooves. The reinforcing bar is passed through the middle of each movable ring 22 and mounting ring 21. By manually rotating the movable rings 22 on both sides, the movable rings 22 drive the movable gear 45 to rotate. During the rotation of the movable rings 22, one end of the transmission rod 35 is driven. As the transmission rod 35 moves, the other end drives the movable block 33 to slide within the limiting groove 34. The sliding of the limiting groove 34 causes the abutment block 3 to contact the wall of the reinforcing bar. After the abutment block 3 contacts the wall of the reinforcing bar, the abutment block 3 is pushed and compresses the first spring 32. The first spring 32 deforms and applies the deformation force to the abutment block 3, making the abutment block 3 and the wall of the reinforcing bar in close contact. The abutment block 3 clamps the reinforcing bar. When the reinforcing bar is difficult to move between the abutment blocks 3, the rotation of the movable ring 22 stops. The movable toothed disc 45 engages with the limiting toothed disc 44 and locks itself, completing the clamping of the reinforcing bar. The reinforcing bar is inserted through the middle of the mounting frame 2, and the movable ring 22 is rotated to quickly complete the clamping and locking of the reinforcing bar. This avoids the technical problem of low transmission efficiency caused by manual rotation of the screw, which affects the clamping efficiency. In addition, the arc-shaped contact end of the abutment block 3 fully fits the wall of the reinforcing bar, and the inclined groove increases the friction between the abutment block 3 and the reinforcing bar, improving the clamping effect.

[0033] Each movable block 33 is equipped with an abutment wheel 36, which is rotatably connected to the corresponding movable block 33. Each abutment wheel 36 has a circumferential groove. After the abutment wheel 36 is driven by the movable block 33 to make close contact with the wall of the steel bar, the wheel-shaped arrangement of the abutment wheel 36 and the rotatable connection between the abutment wheel 36 and the movable block 33 allow the steel bar to be rotated after being clamped, thus changing the shooting position of the steel bar and performing multi-angle calculations on the size of the steel bar. The two clamping methods of the abutment block 3 and the abutment wheel 36 meet the requirements for steel bar detection under different conditions. When it is necessary to detect whether the shape is bent, the abutment wheel 36 is used. When only the size is detected, the abutment block 3 can be used to provide a more stable shooting effect.

[0034] Each movable ring 22 is fixedly connected to a movable gear disc 45, each movable gear disc 45 is rotatably connected to the mounting frame 2, each movable gear disc 45 meshes with a limiting gear disc 44, each limiting gear disc 44 is elastically connected to the corresponding mounting frame 2, each limiting gear disc 44 is surrounded by a movable rod 42, each movable rod 42 is fixedly connected to the corresponding limiting gear disc 44, each movable rod 42 is slidably connected to the corresponding mounting frame 2, and each movable rod 42 is fitted with a second spring 43, the end of each second spring 43 is fixedly connected to the corresponding limiting gear disc 44 and the mounting frame 2 respectively, each limiting gear disc 44 is symmetrically provided with an extension rod 41, each extension rod 41 is fixedly connected to the limiting gear disc 44, each extension rod 41 is slidably connected to the mounting frame 2, and each extension rod 41 is fixedly connected to a pull rod 4. The teeth on the movable gear plate 45 are helical, restricting the rotation of the gear plate 44 and the movable gear plate 45 to only in the forward direction. Reverse rotation is restricted due to the self-locking characteristic of the helical teeth. When it is necessary to remove the rebar, the pull rod 4 is pulled outward manually. The pull rod 4 pulls the extension rods 41 at both ends. The extension rods 41 drive the restricting gear plate 44 to move and compress the second spring 43. The second spring 43 deforms, and the restricting gear plate 44 is driven to separate from the movable gear plate 45 and disengage. The movable ring 22 is rotated manually, and the movable ring 22 drives the abutment block 3 to release the clamp on the rebar. After the clamp is released, the pull force on the pull rod 4 is released manually. The second spring 43 applies deformation force to the restricting gear plate 44, and the restricting gear plate 44 is pushed to re-engage with the movable gear plate 45 for self-locking, preventing the internal components from moving arbitrarily. The self-locking of the internal components is released by a simple pull, and the clamp on the rebar is released.

[0035] Working principle: The reinforcing bar is passed between each movable ring 22 and the mounting ring 21. By manually rotating the movable rings 22 on both sides, the movable rings 22 drive the movable gear 45 to rotate. During the rotation of the movable rings 22, one end of the transmission rod 35 moves accordingly. The other end of the transmission rod 35 drives the movable block 33 to slide in the limiting groove 34. The sliding of the limiting groove 34 causes the abutment block 3 to contact the wall surface of the reinforcing bar. After the abutment block 3 contacts the wall surface of the reinforcing bar, the abutment block 3 is pushed and compresses the first spring 32. The first spring 32 deforms and applies the deformation force to the abutment block 3, making tight contact between the abutment block 3 and the wall surface of the reinforcing bar. The abutment block 3 clamps the reinforcing bar, and when the reinforcing bar is difficult to... The rotation of the movable ring 22 stops as it moves between the abutting blocks 3. The movable toothed disc 45 engages with the limiting toothed disc 44 and locks itself, completing the clamping of the rebar. The rebar is inserted through the middle of the mounting frame 2, and the movable ring 22 is rotated to quickly complete the clamping and locking of the rebar. This avoids the technical problem of low transmission efficiency caused by manual rotation of the screw, which affects the clamping efficiency. Furthermore, the arc-shaped contact end of the abutting block 3 fully fits the wall surface of the rebar, and the inclined groove increases the friction between the abutting block 3 and the rebar, improving the clamping effect. After the abutting wheel 36 is driven by the movable block 33 to make close contact with the wall surface of the rebar, the wheel-shaped setting of the abutting wheel 36 and the rotation between the abutting wheel 36 and the movable block 33 are connected. Next, after clamping the rebar, the rebar can be rotated to change the shooting position, thereby performing multi-angle calculations on the rebar's dimensions. The two clamping methods, abutment block 3 and abutment wheel 36, satisfy the need for rebar inspection under different conditions. When it is necessary to detect whether the shape is bent, abutment wheel 36 is used; when only dimensions are detected, abutment block 3 is used to provide a more stable shooting effect. Because the teeth on the limiting toothed disc 44 and movable toothed disc 45 are helical, the limiting toothed disc 44 and movable toothed disc 45 can only rotate in the same direction. Reverse rotation is restricted due to the self-locking characteristic of the helical teeth. When it is necessary to remove the rebar, the pull rod 4 is pulled outward manually, and the pull rod 4 pulls the extension rods 41 at both ends. The extension rod 41 drives the limiting gear 44 to move and compress the second spring 43. The second spring 43 deforms, and the limiting gear 44 is driven to separate from the movable gear 45 and disengage. The movable ring 22 is manually rotated, and the movable ring 22 drives the abutment block 3 to release the clamping of the steel bar. After the clamping state is released, the tension on the pull rod 4 is manually released, and the second spring 43 applies deformation force to the limiting gear 44. The limiting gear 44 is pushed to re-engage with the movable gear 45 and perform self-locking to prevent the internal components from moving at will. The self-locking of the internal components is released by simple pulling, and the clamping of the steel bar is released. The device detects the size of the steel bar through the detection device 11.

[0036] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A machine vision-based rebar size inspection device, comprising an operating table (1) and an inspection device (11), wherein the operating table (1) is used to install and clamp the rebar, and the inspection device (11) is movably mounted on the operating table (1), characterized in that: The clamping assembly is used to quickly clamp the steel bars. The clamping assembly includes a mounting frame (2), a mounting ring (21), a movable ring (22), and an abutment block (3). The mounting frames (2) are symmetrically arranged on the operating table (1). Each mounting frame (2) has a fixed block (12) fixedly connected to its bottom. Each fixed block (12) is fixedly connected to the operating table (1). Each mounting ring (21) is fixedly connected to the mounting frame (2). Each movable ring (22) is rotatably connected to the mounting frame (2). The abutment block (3) is arranged around the mounting frame (2). Each abutment block (3) is drivenly connected to the corresponding movable ring (22).

2. The machine vision-based rebar size detection device according to claim 1, characterized in that, Each of the abutting blocks (3) is slidably connected to a movable block (33), and each movable block (33) is slidably connected to a limiting groove (34). The corresponding limiting groove (34) is fixedly connected to the mounting ring (21).

3. The machine vision-based rebar size detection device according to claim 2, characterized in that, A transmission rod (35) is provided between each of the movable blocks (33) and the corresponding movable ring (22), and the end of each transmission rod (35) is rotatably connected to the corresponding movable ring (22) and the movable block (33).

4. The machine vision-based rebar size detection device according to claim 2, characterized in that, Each of the abutting blocks (3) is fixedly connected to a slide rod (31), each slide rod (31) is slidably connected to the movable block (33), and each slide rod (31) is fitted with a first spring (32).

5. The machine vision-based rebar size detection device according to claim 4, characterized in that, Each of the first springs (32) is fixedly connected to the corresponding abutment block (3) and movable block (33) at its end, and the clamping end of each movable block (33) is arc-shaped, and the clamping end array is provided with inclined grooves.

6. The machine vision-based rebar size detection device according to claim 2, characterized in that, Each of the movable blocks (33) is alternately provided with abutting wheels (36), each abutting wheel (36) is rotatably connected to the corresponding movable block (33), and each abutting wheel (36) is provided with a sloping groove around it.

7. The machine vision-based rebar size detection device according to claim 1, characterized in that, Each of the movable rings (22) is fixedly connected to a movable toothed disc (45), each movable toothed disc (45) is rotatably connected to the mounting frame (2), each movable toothed disc (45) is engaged with a limiting toothed disc (44), and each limiting toothed disc (44) is elastically connected to the corresponding mounting frame (2).

8. The machine vision-based rebar size detection device according to claim 7, characterized in that, Each of the limiting gears (44) is surrounded by a movable rod (42), each movable rod (42) is fixedly connected to the corresponding limiting gear (44), each movable rod (42) is slidably connected to the corresponding mounting frame (2), and each movable rod (42) is fitted with a second spring (43), the end of each second spring (43) is fixedly connected to the corresponding limiting gear (44) and the mounting frame (2).

9. The machine vision-based rebar size detection device according to claim 7, characterized in that, Each of the limiting gears (44) is symmetrically provided with an extension rod (41), each extension rod (41) is fixedly connected to the limiting gear (44), each extension rod (41) is slidably connected to the mounting frame (2), and each extension rod (41) is fixedly connected with a pull rod (4).

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