Machine vision guided bolt screening mechanism

Abstract

The utility model provides a kind of machine vision guided bolt screening mechanism, belong to bolt screening technical field, including base, the top of base is rotationally arranged with sieve tray, the top of sieve tray is sequentially circumferentially provided with blanking groove, the top of sieve tray is symmetrically provided with conveying line, and the spacing between two conveying lines gradually widens from right to left, the bottom of two conveying lines is all clamped with the distance piece located above blanking groove, when identifying that bolt exists quality problem, signal after image identification is passed to processor, into electric signal by processor, electric signal is sent to controller, and the distance component is opened by controller drive, so as to pull two distance pieces, so that bolt falls on corresponding blanking groove from two conveying lines, then by driving sieve tray rotation, next blanking groove is moved to between two conveying lines, by the visual identification of image, the control of bolt quality is improved, and then the quality of bolt screening is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of bolt screening technology, specifically a machine vision-guided bolt screening mechanism. Background Technology

[0002] Bolt processing involves a series of machining processes to produce bolt fasteners with specific shapes, sizes, and properties from metal raw materials (such as carbon steel, stainless steel, aluminum alloys, etc.). After the bolts are processed in batches, they need to be screened according to specifications before being packaged and transported.

[0003] A related technology (publication number: CN221208874U) discloses a bolt screening device for industrial automation. The disclosed technical solution is as follows: a collection box is set to facilitate the collection of the screened bolts; an inclined frame is set to facilitate the reinforcement of the mounting frame; a fixed block is set to install the cylinder; the cylinder is set to move the screening box; the screening box is set to install the threaded sleeve; the threaded sleeve is set to limit the threaded frame; a positioning groove is set to accommodate the screening plate body; a fixing groove is set to fix the right side of the screening plate body; and a mounting groove is set to install the pressure switch.

[0004] The above-disclosed technical solutions reveal the following problems: during the quality screening process after bolt production, the quality of bolts cannot be determined by the naked eye. Therefore, image recognition is needed to screen bolts to ensure their quality. To address this, we propose a machine vision-guided bolt screening mechanism.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background section of this application, and therefore may include prior art information that does not constitute prior art information known to those skilled in the art. Utility Model Content

[0006] This utility model aims to solve at least one of the technical problems existing in the prior art or related technologies. To address the bolt screening problem in the prior art, this utility model provides a machine vision-guided bolt screening mechanism that combines image recognition with a screening structure to improve screening quality. Its specific technical solution is as follows:

[0007] A machine vision-guided bolt screening mechanism includes a base, a screen plate rotatably mounted on the top of the base, and material discharge grooves sequentially and circumferentially formed on the top of the screen plate. Conveyor lines are symmetrically arranged above the screen plate, with the distance between two conveyor lines gradually widening from right to left. A tension member located above the material discharge groove is engaged at the bottom of each of the two conveyor lines. A right base frame is fixed to the outer wall of the base, and a pitch-changing assembly for driving the two tension members to move in opposite directions is mounted on the right base frame. An image recognition device for detecting bolts is also mounted on the right base frame.

[0008] In the above technical solution, a left base frame symmetrical to the right base frame is fixed to the outer wall of the machine base. Both the left base frame and the right base frame are rotatably equipped with transmission components. The two conveyor lines are symmetrically sleeved on the outside of the two transmission components.

[0009] The pitch-changing assembly includes a base frame fixed to the top of the right base frame. A central shaft is fixed to the top of the base frame. A transmission frame is symmetrically sleeved on the outer wall of the central shaft. The bottom end of the transmission frame is fixedly connected to the pitch-changing member. An electric push rod is fixed to the top of the base frame. A transmission rod is hinged between the movable end of the electric push rod and the two transmission frames.

[0010] A support member is rotatably mounted on the left base frame, located between the two conveyor lines.

[0011] A guide chute is inclinedly arranged on the left base frame and located below the conveyor line.

[0012] The image recognition device is fixed to the bottom of the base frame and faces the sieve plate.

[0013] The conveyor line passes sequentially through the inner cavities of the right base frame and the left base frame.

[0014] Ball bearings are evenly arranged circumferentially between the screen plate and the machine base, and a rotary drive component is provided on the machine base to drive the screen plate to rotate.

[0015] The rotary drive component includes a base fixed to the top of the machine base, a rotating seat fixed to the bottom of the screen plate and sleeved outside the base, a gear ring sleeved on the outer wall of the rotating seat, and a drive gear meshing with the gear ring on the outer wall of the machine base.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This machine vision-guided bolt screening mechanism:

[0017] 1. The bolts placed on the two conveyor lines are visually identified by an image recognition device. When a quality problem is detected in a bolt, the pitch control component is activated, which pulls the two tensioning parts so that the bolt falls from the two conveyor lines onto the corresponding drop chute. Then, by driving the screen plate to rotate, the next drop chute is moved between the two conveyor lines. Through visual image recognition, the quality control of bolts is improved, thereby ensuring the quality of bolt screening.

[0018] 2. The electric push rod is connected to a power source via a wire. The movable end of the electric push rod drives one end of the two hinged transmission rods to move, which in turn drives the other end of the transmission rods to move the hinged transmission frame. The central shaft limits the movement of the two transmission frames, which in turn drives the tension frame to move, thereby adjusting the distance between the two conveyor lines. Attached Figure Description

[0019] Figure 1 This is a schematic diagram (I) of a machine vision-guided bolt screening mechanism according to the present invention;

[0020] Figure 2 This is a schematic diagram (II) of the structure of a machine vision-guided bolt screening mechanism according to the present invention;

[0021] Figure 3 This is an exploded view of the structure of the base and screen plate of this utility model;

[0022] Figure 4 for Figure 1 A magnified view of part A;

[0023] Figure 5 for Figure 2 A magnified view of section B;

[0024] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1-base, 2-screen plate, 3-feeding chute, 4-transmission component, 5-conveyor line, 6-image recognition device, 7-base frame, 8-right base frame, 9-guide chute, 10-drive gear, 11-spreading component, 13-gear ring, 14-slide groove, 15-rotating seat, 16-base, 17-moving groove, 18-ball bearing, 19-tension frame, 20-fixed frame, 21-electric push rod, 22-transmission rod, 23-left base frame, 25-central shaft, 27-transmission frame. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The following are specific implementation cases and appendices. Figure 1-5 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0027] A machine vision-guided bolt sorting mechanism includes a base 1, a screen 2 rotatably mounted on the top of the base 1, and circumferentially arranged material drop troughs 3 on the top of the screen 2. A continuous circumference of material drop troughs 3 is formed along the top edge of the screen 2. Conveyor lines 5 are symmetrically arranged above the screen 2, with the spacing between the two conveyor lines 5 gradually widening from right to left. Bolts placed on the two conveyor lines 5 by a feeding assembly move with the conveyor lines 5. As the conveyor lines 5 move to the point where the spacing widens, the bolts, after image detection, are collected by a receiving trough installed on the left base frame 23.

[0028] Both conveyor lines 5 have a tension member 19 attached to their bottoms above the material drop chute 3, with the tension member 19 positioned closer to the right base frame 8. The right base frame 8 is fixed to the outer wall of the machine base 1, and a pitch-changing assembly is installed on the right base frame 8 to drive the two tension members 19 to move in opposite directions. The left base frame 23 and the right base frame 8 are symmetrically fixed to the outer walls of the two sides of the machine base 1, and are on the same horizontal straight line. An image recognition device 6 is installed on the right base frame 8.

[0029] The image recognition device 6 performs visual recognition on the bolts placed on the two conveyor lines 5. When a quality problem is detected in a bolt, the signal after image recognition is transmitted to the processor, which converts it into an electrical signal. The electrical signal is sent to the controller, which drives the pitch conversion component to open, thereby pulling the two pitch components 19 so that the bolt falls from the two conveyor lines 5 onto the corresponding drop chute 3. Then, by driving the screen plate 2 to rotate, the next drop chute 3 is moved between the two conveyor lines 5. Through visual recognition of the image, the quality control of the bolts is improved, thereby ensuring the quality of bolt screening.

[0030] The machine base 1 has a left base frame 23 fixed to its outer wall, symmetrical to the right base frame 8. Both the left base frame 23 and the right base frame 8 have rotatably mounted transmission components 4. Two conveyor lines 5 are symmetrically sleeved on the outside of the two transmission components 4. The transmission components 4 can be drive wheels. Motors are fixed to both the left base frame 23 and the right base frame 8 via a frame. Two synchronous motors drive the two transmission components 4 to rotate simultaneously. The two conveyor lines 5, sleeved on the outer walls of the two transmission components 4, move cyclically, thereby cyclically inspecting the selected bolts.

[0031] It is worth noting that the pitch-changing assembly includes a base frame 7 fixed to the top of the right base frame 8. A central shaft 25 is fixed to the top of the base frame 7, and transmission frames 27 are symmetrically sleeved on the outer wall of the central shaft 25. A fixed frame 20 is vertically fixed to the top of the base frame 7, and the central shaft 25 is vertically fixed to the surface of the fixed frame 20. Rotary shafts are installed at the bottom of the two transmission frames 27 and the movable end of the electric push rod 21. One end of each of the two transmission rods 22 is sleeved on the outside of the rotating shaft on the transmission frame 27 through a connector. The other end of each of the two transmission rods 22 is sleeved on the outside of the rotating shaft at the movable end of the electric push rod 21 through the mounting holes opened in the connector, so that the two ends of the transmission rods 22 are hinged to the transmission frame 27 and the movable end of the electric push rod 21, respectively.

[0032] The bottom end of the transmission frame 27 is fixedly connected to the tension member 19, and the top of the base frame 7 is fixedly connected to an electric push rod 21. The movable end of the electric push rod 21 is hinged to the two transmission frames 27 and a transmission rod 22 is provided.

[0033] The electric push rod 21 is connected to a power source via a wire. The movable end of the electric push rod 21 drives one end of the two hinged transmission rods 22 to move, and the other end of the transmission rods 22 drives the hinged transmission frame 27 to move. The two transmission frames 27 rotate simultaneously through the limiting of the central shaft 25, thereby driving the tension frame 19 to move through the transmission frame 27, thus adjusting the distance between the two conveyor lines 5.

[0034] In addition, a support member 11 is rotatably installed on the left base frame 23 between the two conveyor lines 5, so that the support member 11 keeps the distance between the two conveyor lines 5 at a certain width. The width is adjusted according to the bolt specifications so that the bolt falls onto the guide chute 9 before it moves to the support member 11.

[0035] Additionally, a guide chute 9 is inclinedly provided on the left base frame 23, located below the conveyor line 5. Through the guide chute 9 located between the support member 11 and the screen plate 2, qualified bolts slide down and are collected.

[0036] Furthermore, the image recognition device 6 is fixed to the bottom of the base frame 7 and faces the sieve tray 2. The image recognition device 6 uses a Hikvision instrument, model DS-K5604A-ZH, which employs a wide dynamic range 2-megapixel binocular camera. Relying on deep learning algorithms, it has a fast recognition speed and higher accuracy. The image recognition device 6 establishes a "pixel-physical unit" mapping relationship through standard parts of known dimensions, for example: 1 pixel = 0.01mm, ensuring a measurement accuracy of ±0.02mm. Based on computer vision technology, it converts the physical characteristics of bolts into digital signals by simulating human visual perception and judgment logic, and then achieves automated defect identification and classification through algorithm analysis.

[0037] Its core principle can be broken down into image acquisition, preprocessing, feature extraction, decision-making, and sorting execution. It employs an area scan camera or a line scan camera with a telecentric lens to eliminate perspective distortion and ensure that the bolt head and screw are sized correctly in the image without any near-large or far-small deviation.

[0038] The conveyor line 5 passes through the inner cavity of the right base frame 8 and the left base frame 23 in sequence. Two limiting holes are opened on the surface of both the left base frame 23 and the right base frame 8 to limit the movement of the two conveyor lines 5.

[0039] Ball bearings 18 are evenly arranged circumferentially between the screen plate 2 and the machine base 1, and a rotary drive component that drives the screen plate 2 to rotate is provided on the machine base 1.

[0040] The rotary drive component includes a base 16 fixed to the top of the base 1, a rotating seat 15 fixed to the bottom of the screen disc 2 and sleeved on the outside of the base 16, a gear ring 13 sleeved on the outer wall of the rotating seat 15, and a drive gear 10 meshing with the gear ring 13 on the outer wall of the base 1. A groove is formed at the bottom of the rotating seat 15, and a sliding groove 14 is formed circumferentially on the inner wall of the groove. A movable groove 17 is formed circumferentially on the outer wall of the base 16. A ball bearing 18 is movably embedded in the movable cavity formed by each movable groove 17 and the sliding groove 14. The circumferential arrangement of the ball bearing 18 ensures the stability of the screen disc 2 during rotation.

[0041] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A machine vision guided bolt screening mechanism, characterized by: The machine includes a base (1), a screen plate (2) is rotatably mounted on the top of the base (1), a material drop groove (3) is sequentially opened circumferentially on the top of the screen plate (2), a conveyor line (5) is symmetrically arranged above the screen plate (2), and the distance between the two conveyor lines (5) gradually widens from right to left. The bottom of the two conveyor lines (5) is clamped with a tension member (19) located above the material drop groove (3). A right base frame (8) is fixed to the outer wall of the base (1). A pitch-changing assembly for driving the two tension members (19) to move in opposite directions is provided on the right base frame (8). An image recognition device (6) for detecting bolts is provided on the right base frame (8).

2. A machine vision guided bolt screening mechanism as claimed in claim 1, wherein: The outer wall of the base (1) is fixed with a left base frame (23) that is symmetrical to the right base frame (8). Both the left base frame (23) and the right base frame (8) are rotatably equipped with transmission components (4). The two conveyor lines (5) are symmetrically sleeved on the outside of the two transmission components (4).

3. A machine vision guided bolt screening mechanism as claimed in claim 1, wherein: The pitch-changing assembly includes a base frame (7) fixed to the top of the right base frame (8), a central shaft (25) fixed to the top of the base frame (7), a transmission frame (27) symmetrically sleeved on the outer wall of the central shaft (25), the bottom end of the transmission frame (27) fixedly connected to the tension member (19), an electric push rod (21) fixed to the top of the base frame (7), and a transmission rod (22) hinged between the movable end of the electric push rod (21) and the two transmission frames (27).

4. The machine vision-guided bolt sorting mechanism according to claim 2, characterized in that: The left base frame (23) is rotatably provided with a support member (11) located between the two conveyor lines (5).

5. The machine vision-guided bolt screening mechanism according to claim 2, characterized in that: The left base frame (23) is inclined to have a guide trough (9) located below the conveyor line (5).

6. The machine vision-guided bolt screening mechanism according to claim 3, characterized in that: The image recognition device (6) is fixed to the bottom of the base frame (7) and faces the sieve plate (2).

7. The machine vision-guided bolt screening mechanism according to claim 2, characterized in that: The conveyor line (5) passes through the inner cavity of the right base frame (8) and the left base frame (23) in sequence.

8. The machine vision-guided bolt sorting mechanism according to claim 1, characterized in that: Ball bearings (18) are evenly arranged circumferentially between the screen plate (2) and the machine base (1), and a rotary drive component is provided on the machine base (1) to drive the screen plate (2) to rotate.

9. A machine vision-guided bolt sorting mechanism according to claim 8, characterized in that: The rotary drive component includes a base (16) fixed to the top of the machine base (1), a rotating seat (15) fixed to the bottom of the screen (2) and sleeved on the outside of the base (16), a gear ring (13) sleeved on the outer wall of the rotating seat (15), and a drive gear (10) meshing with the gear ring (13) on the outer wall of the machine base (1).

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