A conveying device for rail transit vehicle hexagonal head bolt production

Abstract

The present application relates to bolt conveying device technical field, specifically to a kind of hexagonal head bolt production conveying device for rail transit vehicle, including rack, and rack is equipped with storage tank, and storage tank is provided with whole material component and straight shock frame;Far from the whole material component one end of straight shock frame is circumscribed with conveying component, and conveying component includes flexible conveying frame and detection frame, and detection frame is fixedly installed with light shield, and light shield is provided with light supplement lamp and detection camera, and detection frame is also installed with sliding table, when bolt body moves to sliding table along conveying groove, sliding table lifts bolt body and is sent into light shield to carry out visual inspection, and between straight shock frame and detection station, flexible conveying frame is set by first deformation plate, second deformation plate and bidirectional screw rod, can be curved or straightened according to the layout of local rack, break through the limitation of traditional rigid conveying device to installation space.

Description

Technical Field

[0001] This invention relates to the field of bolt conveying devices, specifically a conveying device for the production of hexagonal head bolts for rail transit vehicles. Background Technology

[0002] In fields such as machining, assembly manufacturing, and automated logistics, hexagonal bolts are basic fasteners. Their automated conveying and sorting are key links to ensure production line efficiency. Existing hexagonal bolt conveying devices mostly use vibratory feeders, belt conveyors, or roller conveyor mechanisms. They achieve the directional arrangement and transmission of bolts through physical guiding structures. For example, traditional vibratory feeders use high-frequency vibration to make bolts move in an orderly manner along a spiral track. Combined with the shape of the track groove, some bolts with unqualified postures are rejected. Belt conveyors drive the bolts to move horizontally through friction, and combine baffles or diverter plates to adjust the conveying path.

[0003] However, traditional conveying devices rely on mechanical structures to restrict the bolt posture, and can only screen out bolts that are obviously deviated, but cannot accurately identify minor defects such as the orientation of the hexagonal head, thread damage, and surface scratches, causing unqualified bolts to flow into subsequent processes and affecting assembly quality.

[0004] In recent years, visual inspection technology has been gradually applied to industrial inspection scenarios due to its advantages such as non-contact, high precision, and online real-time analysis. Some existing technologies attempt to add visual sensors at the end of the conveyor line to image and analyze the dimensional parameters of bolts. However, the coordination between visual inspection and the conveying device is insufficient. For example, the conveying path is mostly a rigid structure, which cannot flexibly adapt to the light-avoidance environment or specific shooting angle required for visual inspection. Summary of the Invention

[0005] The purpose of this invention is to provide a conveying device for the production of hexagonal head bolts for rail transit vehicles, in order to solve the problem mentioned in the background art that the conveying path is mostly a rigid structure, which cannot flexibly adapt to the light-avoiding environment or specific shooting angle required for visual inspection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A conveying device for producing hexagonal head bolts for rail transit vehicles includes a frame with a storage bin on the frame. The storage bin contains a material-forming assembly and a vertical vibration frame. Bolt bodies are formed by the material-forming assembly and then conveyed to the vertical vibration frame. A conveying assembly is connected to the end of the vertical vibration frame furthest from the material-forming assembly. The conveying assembly includes a flexible conveying frame with a conveying groove for the bolt bodies to pass through. Mounting legs are spaced apart on both sides of the flexible conveying frame along its extension direction, and each mounting leg has a first mounting hole. A detection frame is slidably mounted on the flexible conveying frame, and the detection frame has a second mounting hole. A light shield is fixedly mounted on the detection frame, and a supplementary light and a detection camera are installed inside the light shield. A sliding table is also mounted on the detection frame. When a bolt body moves along the conveying groove to the sliding table, the sliding table lifts the bolt body and sends it into the light shield for visual inspection.

[0007] Preferably, the flexible conveyor frame includes a first deformable plate and a second deformable plate, with third mounting holes at both ends of the first and second deformable plates. Both the first and second deformable plates have longitudinal extensions, and a bidirectional lead screw is threaded between the extensions on both sides. A slide rail is provided on the first deformable plate, and the detection frame slides in cooperation with the slide rail.

[0008] Preferably, the detection frame includes a first base and a function plate. The second mounting hole is formed on the first base, and the function plate is slidably mounted on the first base. Pressing modules are provided on both sides of the first base. Each pressing module includes a first rack slidably mounted on the first base. A pressing key is fixedly mounted at one end of the first rack outside the first base. The other end of the first rack extends into the first base and is slidably mounted on a second sliding pin. A friction block is fixedly mounted on the second sliding pin and contacts the function plate. A second rack is fixedly mounted on the friction block. A gear meshes between the first rack and the second rack, and the gear is rotatably mounted on the inner wall of the first base.

[0009] Preferably, a first sliding pin is fixedly installed on the pressing key, the second rack is slidably installed on the first sliding pin, and a transverse groove is provided on the first sliding pin to expose the second rack for meshing with a gear; wherein, a first spring is sleeved on the first sliding pin, and the two ends of the first spring are respectively fixed to the outer wall surface of the pressing key and the first seat.

[0010] Preferably, the first base and the functional plate have corresponding notches on opposite sides, the slide is movably installed in the notch, a locking screw is fixedly installed on the slide, and a locking block is threaded onto the locking screw to lock the slide in the notch.

[0011] Preferably, a clamping assembly is provided inside the light shield. The clamping assembly includes a slider, and a clamping cover is fixedly installed on one end of the slider near the opening of the light shield. Two clamping arms are rotatably mounted on the slider, and a third spring connects the two clamping arms. The clamping ends of the clamping arms extend into the clamping cover. A sliding rod is fixedly installed on the side of the slider near the detection frame, and a metal shaft is fixedly installed on the sliding rod. A photoresistor is installed inside the clamping cover, and an electromagnetic coil is installed inside the light shield. The sliding rod passes through the electromagnetic coil, and the electromagnetic coil is electrically connected to the photoresistor.

[0012] Preferably, a guide rod is fixedly installed on the slider, with one end of the guide rod away from the slider extending through the light shield. A return spring is sleeved on the guide rod, and the two ends of the return spring are fixed to the stepped surface of the guide rod and the outer wall of the light shield, respectively.

[0013] Preferably, a wedge-shaped rod is fixedly installed inside the light shield. When the slider rises to the maximum stroke position, the two clamping arms respectively abut against the inclined surface of the wedge-shaped rod.

[0014] Preferably, a cylinder is fixedly installed on the testing frame, and a partition is fixedly installed on the output end of the cylinder. The flexible conveyor frame has a slot adapted to the partition. When the bolt body moves to the testing station, the partition is inserted into the slot to block the bolt body to be tested from continuing to move forward.

[0015] Preferably, a leveling assembly is installed on the frame. The leveling assembly includes a second base, on which an adjusting plate is slidably installed. A leveling plate is bolted onto the adjusting plate, and the leveling plate is located on the straight vibration frame. An adjusting screw is rotatably installed inside the second base, and the adjusting plate is threaded onto the adjusting screw.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention sets up a flexible conveyor frame between the straight vibration frame and the testing station, consisting of a first deformable plate, a second deformable plate, and a bidirectional lead screw. It can be bent or straightened according to the layout of the machine frame on site, breaking through the limitations of traditional rigid conveyor devices on installation space. At the same time, the leveling component on the machine frame precisely controls the gap between the leveling plate and the conveying surface by adjusting the lead screw, forcibly pressing the upright, inclined, or stacked bolts into a single layer arrangement, ensuring that the bolts entering the testing area are of uniform height, providing a stable imaging benchmark for subsequent visual inspection, and effectively avoiding misjudgments caused by chaotic posture.

[0017] 2. This invention utilizes a photoresistor to sense the bolt blocking light to control the current of the electromagnetic coil, which, in conjunction with a reset spring, drives the slider to rise and fall. This eliminates the need for external pneumatic components to raise and lower the bolt. The inclined surface on the inner side of the clamping arm generates a centripetal force on the bolt when closed, achieving automatic centering and ensuring the bolt is centered in the field of view during visual inspection. When the slider reaches its apex, the wedge-shaped inclined surface forcibly opens the clamping arm to release the bolt, solving the problem of jamming or failure to release material caused by return stroke errors in traditional grippers. This significantly improves the reliability of large-scale bolt inspection for rail transit vehicles.

[0018] 3. This invention sets a detection sensor at the end of the vertical vibration frame to monitor the accumulation situation in real time upstream and feed it back to the control system to adjust the rotation speed of the material assembly. Downstream, a fiber optic sensor triggers a cylinder baffle to insert into the slot for physical blocking, forming a three-level protection mechanism of upstream anti-overflow, midstream anti-blocking, and downstream anti-rear-end collision. This ensures that only one bolt enters the detection station at a time, completely eliminating the problem of multi-target interference imaging and greatly improving the accuracy of visual inspection and the stability of production cycle. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the flexible conveyor frame structure of the present invention; Figure 3 This is a schematic diagram of the detection frame structure of the present invention; Figure 4 This is a second-view structural schematic diagram of the detection frame of the present invention; Figure 5 This is a schematic diagram of the pressing module structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the light shield of the present invention; Figure 7 This is a schematic diagram of the clamping cover structure of the present invention; Figure 8 This is a schematic diagram of the clamping cover structure from a second perspective of the present invention; Figure 9 This is a schematic diagram of the leveling component structure of the present invention.

[0020] In the attached diagram, the components represented by each number are as follows: 10. Frame; 20. Storage bin; 30. Material handling assembly; 40. Vertical vibrating frame; 50. Bolt body; 60. Conveying assembly; 61. Flexible conveying frame; 611. Conveying trough; 612. Mounting support; 601. First mounting hole; 613. First deformable plate; 614. Second deformable plate; 615. Third mounting hole; 616. Extension; 617. Bidirectional lead screw; 618. Slide rail; 62. Detection frame; 602. Second mounting hole; 621. First base; 622. Functional plate; 623. Pressing module; 6231. First rack; 6232. Pressing key; 6233. Second sliding pin; 6234. Friction block; 6235. Second rack; 6236. Gear; 6237. First sliding pin; 6238. Horizontal groove; 6239. First spring; 63. Light shield; 631. Wedge rod; 64. Supplemental light; 65. Detection camera; 66. Slide table; 661. Locking screw; 662. Locking block; 67. Clamping assembly; 671. Slider; 672. Clamping cover; 673. Clamping arm; 604. Third spring; 674. Slide rod; 675. Metal shaft; 676. Photoresistor; 677. Electromagnetic coil; 678. Guide rod; 679. Return spring; 603. Notch; 68. Cylinder; 681. Partition plate; 605. Slot; 70. Leveling assembly; 71. Second seat; 72. Adjusting plate; 73. Leveling plate; 74. Adjusting screw. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example: This invention provides a technical solution: such as Figure 1 - Figure 9 The device shown is a conveying device for producing hexagonal head bolts for rail transit vehicles. It includes a frame 10, a storage box 20 on the frame 10, and a bolt body 50 to be conveyed. The storage box 20 is equipped with a straightening component 30 and a vertical vibration frame 40. The straightening component 30 is used to adjust the randomly stacked bolt bodies 50 into a uniform posture. After being sorted by the straightening component 30, the bolt bodies 50 are conveyed to the vertical vibration frame 40.

[0023] In this embodiment, the material feeding assembly 30 is a disc-type feeding assembly, and the linear vibrating frame 40 is a linear feeder. Both of these are existing technologies, and their specific structures and working principles are existing technologies, which will not be described in detail here.

[0024] The end of the straight vibration frame 40 away from the material preparation assembly 30 is connected to a conveying assembly 60. The conveying assembly 60 includes a flexible conveying frame 61. The flexible conveying frame 61 is provided with a conveying groove 611 for the bolt body 50 to pass through. The bolt body 50 is arranged in sequence in the conveying groove 611 and moves forward. The two sides of the flexible conveying frame 61 are provided with mounting feet 612 at intervals along its extension direction. The mounting feet 612 are provided with first mounting holes 601 for connecting and fixing with different frame structures or assembly lines. The flexible conveying frame 61 has bendable characteristics and can adjust the conveying path according to the actual working conditions, thereby adapting to the complex frame layout and space constraints in the rail transit vehicle production line and realizing a flexible transition from the straight vibration frame 40 to the testing station.

[0025] A detection frame 62 is slidably mounted on the flexible conveyor frame 61. The position of the detection frame 62 can be adjusted along the length of the flexible conveyor frame 61. A second mounting hole 602 is provided on the detection frame 62 for locking. A light shield 63 is fixedly mounted on the detection frame 62. A supplementary light 64 and a detection camera 65 are provided inside the light shield 63, forming a visual inspection unit. The light shield 63 can effectively block external stray light and ensure that the detection camera 65 can collect image information of the bolt body 50 under stable lighting conditions.

[0026] The inspection frame 62 is also equipped with a slide table 66. When the bolt body 50 moves along the conveying groove 611 to the slide table 66, the bolt body 50 is lifted on the slide table 66 into the light shield 63 for visual inspection. At this time, the supplementary light 64 provides uniform illumination, and the inspection camera 65 performs visual inspection on the hexagonal head size, thread condition and surface defects of the bolt body 50.

[0027] The operator pours hexagonal head bolts from the rail transit vehicle to be inspected into the storage bin 20. The material assemblies 30 arrange the bolt bodies 50 into a uniform posture and convey them one by one to the vertical vibration frame 40. The vertical vibration frame 40 conveys the bolt bodies 50 forward through linear vibration. The bolt bodies 50 enter the conveying groove 611 of the flexible conveyor frame 61. The flexible conveyor frame 61 can be bent or straightened according to the working conditions of the frame 10 on site to ensure that the conveying path avoids obstacles and maintains stable conveying, thereby solving the problem of poor adaptability of traditional rigid conveying devices. The bolt bodies 50 move along the conveying groove 611 to the bottom of the inspection frame 62. The position of the inspection frame 62 can slide and be fixed along the flexible conveyor frame 61 according to the inspection requirements to ensure the best shooting distance and angle for visual inspection.

[0028] When the bolt body 50 reaches the position of the slide table 66, the bolt body 50 is lifted on the slide table 66 into the light shield 63. The supplementary light 64 inside the light shield 63 provides a stable light source. The detection camera 65 acquires images of the bolt body 50. Through image processing algorithms, the system can determine the hexagonal head size, thread integrity, and whether there are defects such as cracks or missing material in the bolt body 50.

[0029] Reference Figure 2 The flexible conveyor frame 61 includes a first deformable plate 613 and a second deformable plate 614. The first deformable plate 613 and the second deformable plate 614 have third mounting holes 615 at both ends. The third mounting holes 615 are used to fix and connect with the vertical vibration frame 40, thereby realizing power connection. The first deformable plate 613 and the second deformable plate 614 both have longitudinal extensions 616. The two side extensions 616 are arranged opposite to each other. The two side extensions 616 are threaded together by a bidirectional lead screw 617. By rotating the bidirectional lead screw 617, the distance between the first deformable plate 613 and the second deformable plate 614 can be adjusted synchronously, so that the flexible conveyor frame 61 can adapt to vertical vibration frames 40 of different diameters and ensure the centering and continuity of the conveying trough 611.

[0030] The first deformable plate 613 is provided with a slide rail 618, and the detection frame 62 slides in conjunction with the slide rail 618, so that the position of the detection frame 62 can be adjusted along the length direction of the flexible conveyor frame 61 and locked and fixed through the second mounting hole 602.

[0031] Reference Figure 3 - Figure 5 The testing frame 62 includes a first base 621 and a function plate 622. A second mounting hole 602 is formed on the first base 621 for locking with the frame 10. The function plate 622 is slidably mounted on the first base 621 and can be finely adjusted along a plane perpendicular to the conveying direction.

[0032] Both sides of the first base 621 are provided with pressing modules 623. The pressing module 623 includes a first rack 6231 slidably mounted on the first base 621. A pressing button 6232 is fixedly mounted on one end of the first rack 6231 outside the first base 621. The other end of the first rack 6231 extends into the first base 621 and is slidably mounted with a second sliding pin 6233. A friction block 6234 is fixedly mounted on the second sliding pin 6233. The friction block 6234 and the function plate 62 are connected. 2. A second rack 6235 is fixedly installed on the friction block 6234. A gear 6236 meshes between the first rack 6231 and the second rack 6235. The gear 6236 is rotatably installed on the inner wall of the first seat 621. By pressing the press key 6232, the first rack 6231 is moved, and the second rack 6235 is moved in the opposite direction through the transmission of the gear 6236, so that the friction block 6234 presses tightly against the function plate 622, thereby realizing the positioning and locking of the function plate 622.

[0033] A first sliding pin 6237 is fixedly installed on the press button 6232, and a second rack 6235 is slidably installed on the first sliding pin 6237. A transverse groove 6238 is provided on the first sliding pin 6237 to expose the second rack 6235 to mesh with the gear 6236. A first spring 6239 is sleeved on the first sliding pin 6237. The two ends of the first spring 6239 are fixed to the outer wall surfaces of the press button 6232 and the first seat 621, respectively, to automatically reset the friction block 6234 after the press button 6232 is released.

[0034] Furthermore, the first base 621 and the functional plate 622 are respectively provided with corresponding notches 603 on their opposite sides. The slide table 66 is movably installed in the notch 603. A locking screw 661 is fixedly installed on the slide table 66. A locking block 662 is threadedly connected to the locking screw 661 to lock the slide table 66 at any height position in the notch 603.

[0035] The inspection frame 62 slides along the flexible conveyor frame 61 to the inspection position via the slide rail 618 and is locked through the second mounting hole 602. Then, by pressing the pressing key 6232, the friction block 6234 is pressed tightly against the functional plate 622 by the transmission of the gear 6236 with the first rack 6231 and the second rack 6235, thereby locking the position of the functional plate 622 and the visual inspection unit on it to prevent vibration from loosening.

[0036] Reference Figure 6 - Figure 8 A clamping assembly 67 is provided inside the light shield 63. The clamping assembly 67 includes a slider 671. A clamping cover 672 is fixedly installed on one end of the slider 671 near the opening of the light shield 63. Two clamping arms 673 are rotatably mounted on the slider 671. A third spring 604 is connected between the two clamping arms 673, and the clamping ends of the clamping arms 673 extend into the clamping cover 672. Under the action of the third spring 604, the two clamping arms 673 always maintain an inward preload to hold the bolt body 50. It should be noted that the side of the two clamping arms 673 near the bolt body 50 is an inclined surface, which can fit against the outer circumferential surface of the bolt body 50 during the clamping process. Utilizing the guiding effect of the inclined surface, the bolt body 50 is pulled towards the central axis of the clamping cover 672 when the clamping arms 673 are closed, thereby realizing the automatic centering and clamping of the bolt body 50 during the detection process.

[0037] A slide rod 674 is fixedly installed on the side of the slider 671 near the detection frame 62. A metal shaft 675 is fixedly installed on the slide rod 674. A photoresistor 676 is installed inside the clamping cover 672. The light-receiving surface of the photoresistor 676 faces the opening of the clamping cover 672. An electromagnetic coil 677 is installed inside the light shield 63. The slide rod 674 passes through the electromagnetic coil 677. The electromagnetic coil 677 is electrically connected to the photoresistor 676.

[0038] Furthermore, a guide rod 678 is fixedly installed on the slider 671. One end of the guide rod 678 away from the slider 671 extends through the light shield 63. A return spring 679 is sleeved on the guide rod 678. The two ends of the return spring 679 are fixed to the stepped surface of the guide rod 678 and the outer wall of the light shield 63, respectively.

[0039] When the bolt body 50 rises with the slide table 66 into the clamping cover 672, the bolt body 50 blocks the light inside the clamping cover 672, making the clamping cover 672 dark. The photoresistor 676 increases its resistance due to the lack of light, which reduces the current flowing through the electromagnetic coil 677. The magnetic field generated by the electromagnetic coil 677 is insufficient to overcome the elastic force of the return spring 679, and it can no longer attract the metal shaft 675. The return spring 679 then resets, pulling the slider 671 upward, thereby causing the bolt body 50 to rise together, so that the entire bolt body 50 enters the field of view of the detection camera 65, completing the visual inspection.

[0040] A wedge rod 631 is fixedly installed inside the light shield 63. When the slider 671 rises to the maximum stroke position, the two clamping arms 673 respectively abut against the inclined surface of the wedge rod 631.

[0041] When the slider 671 moves to its maximum stroke position, the two clamping arms 673 abut against the inclined surfaces of the wedge rod 631. As the slider 671 continues to rise, the wedge rod 631 applies pressure to the clamping arms 673, forcing the two clamping arms 673 to open against the preload of the third spring 604, thereby releasing the bolt body 50. The bolt body 50 falls back into the conveying groove 611. After the bolt body 50 leaves the clamping cover 672, the light shines again on the photoresistor 676, the resistance decreases, the current of the electromagnetic coil 677 increases, and the metal shaft 675 is attracted again. The slider 671 moves down to reset, and the clamping arms 673 close under the action of the third spring 604, ready for the next clamping action.

[0042] Reference Figure 2 A cylinder 68 is fixedly installed on the inspection frame 62, and a partition 681 is fixedly installed on the output end of the cylinder 68. A slot 605 adapted to the partition 681 is opened on the flexible conveyor frame 61. When the bolt body 50 moves to the inspection station, the partition 681 is inserted into the slot 605 to block the bolt body 50 to be inspected from continuing to move forward.

[0043] When the bolt body 50 moves to the inspection station, the cylinder 68 drives the partition 681 to insert into the slot 605 on the flexible conveyor frame 61 to block the bolt body 50 to be inspected from moving forward and prevent material accumulation from interfering with the visual inspection of the current workpiece.

[0044] To achieve precise interception of the bolt body 50 and prevent material from interfering with visual inspection, the cylinder 68 is equipped with detection and control electronic components. Specifically, a fiber optic sensor is installed on the side of the cylinder 68, facing the moving path of the bolt body 50, to monitor in real time whether the bolt body 50 has reached the detection station. A solenoid valve is also connected to the air intake passage of the cylinder 68. The solenoid valve is electrically connected to the positioning fiber optic sensor to receive the electrical signal from the fiber optic sensor and control the extension and retraction of the cylinder 68.

[0045] Correspondingly, a diffuse reflection photoelectric sensor is installed on the vertical vibration frame 40, with its transmitting and receiving ends facing the surface of the conveying track of the vertical vibration frame 40, to detect whether there is an accumulation of bolt bodies 50 at the end of the vertical vibration frame 40. The drive motor of the material preparation assembly 30 is electrically connected to the control system, and the diffuse reflection photoelectric sensor is also electrically connected to the control system.

[0046] Under normal feeding conditions, the material preparation assembly 30 operates at a set speed, feeding the bolt bodies 50 one by one into the linear vibration frame 40. The linear vibration frame 40 conveys the bolt bodies 50 forward to the flexible conveyor frame 61 and the detection station through linear vibration. When the downstream is lagging behind, the bolt bodies 50 will accumulate at the end of the linear vibration frame 40. Once the diffuse reflection photoelectric sensor continuously detects that the bolt bodies 50 cover its detection area for more than a preset time, it is determined that the downstream is congested. After receiving the blockage signal, the control system reduces the motor speed of the material preparation assembly 30 to avoid continuous feeding of bolts at the entrance of the storage box 20 and the linear vibration frame 40 due to a brief stop in the downstream.

[0047] Reference Figure 1 and Figure 9 A leveling assembly 70 is installed on the frame 10. The leveling assembly 70 includes a second base 71. An adjusting plate 72 is slidably installed on the second base 71. A leveling plate 73 is bolted to the adjusting plate 72. The leveling plate 73 is located on the straight vibration frame 40. An adjusting screw 74 is rotatably installed inside the second base 71. The adjusting plate 72 is threaded onto the adjusting screw 74. By rotating the adjusting screw 74, the adjusting plate 72 can be driven to move precisely in the vertical direction, thereby accurately adjusting the gap height between the bottom surface of the leveling plate 73 and the conveying surface of the straight vibration frame 40.

[0048] During the process of conveying the bolt body 50 by the straight vibrating frame 40, if the bolt bodies 50 overlap, the plate 73 will apply resistance on one side, forcing the bolt bodies 50 to pass only when they are in the correct posture and arranged in a single layer.

[0049] Working principle: When in use, the hexagonal head bolt body 50 of the rail transit vehicle to be tested is poured into the storage box 20. The material straightening assembly 30 straightens the messy bolt bodies 50 into a uniform posture and outputs them one by one to the vertical vibration frame 40. The start, stop and speed of the material straightening assembly 30 are controlled by the control system.

[0050] After the bolt body 50 enters the linear vibration frame 40, it is conveyed forward under the linear vibration of the linear vibration frame 40. The leveling component 70 on the frame 10 limits the height and corrects the posture of the bolt body 50.

[0051] A diffuse reflection photoelectric sensor is installed at the end of the vertical vibration frame 40 to monitor whether there is a buildup of bolt bodies 50 at the output end of the vertical vibration frame 40. When the downstream detection station is occupied and the bolt bodies 50 are not removed in time and accumulate at the end of the vertical vibration frame 40, the diffuse reflection photoelectric sensor outputs a blockage signal to the control system. The control system reduces the speed of the material preparation assembly 30 or stops the operation of the material preparation assembly 30 to avoid the continuous feeding of bolt bodies 50, which may cause overflow or posture confusion. When the downstream returns to normal and the bolt bodies 50 are removed, the material preparation assembly 30 resumes its original speed operation.

[0052] The bolt body 50 output by the straight vibration frame 40 enters the conveying groove 611 of the flexible conveying frame 61. The flexible conveying frame 61 is composed of a first deformable plate 613 and a second deformable plate 614 connected by a bidirectional screw 617. It can be bent or straightened according to the working conditions of the on-site frame 10 and is fixed by the mounting feet 612 to achieve flexible transition conveying under complex working conditions. When the bolt body 50 moves to the detection station, the fiber optic sensor on the detection frame 62 detects the bolt body 50. The control system drives the cylinder 68 to extend, and the partition 681 is inserted into the slot 605 of the flexible conveying frame 61, physically blocking the bolt body 50 to be inspected from continuing to move forward, ensuring that only one bolt body 50 is in the detection area at a time.

[0053] Meanwhile, the slide table 66 lifts the bolt body 50 from the conveying groove 611 into the clamping cover 672. After the bolt body 50 enters the clamping cover 672, it blocks the internal light. Due to the lack of light, the resistance of the photoresistor 676 inside the clamping cover 672 increases, causing the current of the electromagnetic coil 677 to decrease. The attraction force of the electromagnetic coil 677 on the metal shaft 675 is less than the elastic force of the return spring 679. The return spring 679 pulls the slider 671 upward, causing the bolt body 50 to rise synchronously, so that the whole bolt body enters the field of view of the inspection camera 65. During the rise of the slider 671, the two clamping arms 673 close under the action of the third spring 604. Their inner inclined surfaces contact the outer periphery of the bolt body 50 and pull the bolt body 50 towards the center, realizing automatic centering and clamping, and improving the accuracy of visual inspection imaging. The supplementary light 64 provides uniform illumination. The inspection camera 65 performs visual inspection on the hexagonal head size, the width of the opposite sides, the thread condition, and surface defects of the bolt body 50. The inspection results are fed back to the control system.

[0054] When the slider 671 moves to its maximum stroke position, the two clamping arms 673 respectively abut against the inclined surface of the wedge-shaped rod 631 fixed inside the light shield 63. The wedge rod 631 forces the clamping arms 673 to open against the third spring 604, and the bolt body 50 loses its constraint and falls back into the conveying groove 611 of the flexible conveyor frame 61. After the bolt body 50 leaves the clamping cover 672, the light shines on the photoresistor 676 again, the resistance of the photoresistor 676 decreases, the current of the electromagnetic coil 677 increases and attracts the metal shaft 675 again, the slider 671 moves down to reset, and the clamping arms 673 close under the action of the third spring 604. At the same time, the control system controls the cylinder 68 to retract the partition 681, releasing the obstruction of the bolt body 50 behind, and the next bolt body 50 enters the inspection station to start the next cycle.

[0055] The inspection frame 62 can slide along the slide rail 618 of the flexible conveyor frame 61 and the function plate 622 can be finely adjusted and locked through the pressing module 623 to adapt to the high vibration conditions of the rail transit site and prevent the visual inspection unit from loosening and shifting; the slide table 66 can be adjusted up and down within the notch 603 and locked with the locking block 662 through the locking screw 661 to ensure that the inspection focus matches bolts of different specifications.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0057] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A conveying device for producing hexagonal head bolts for rail transit vehicles, comprising a frame (10), characterized in that: The frame (10) is provided with a storage box (20), and the storage box (20) is provided with a material straightening assembly (30) and a straight vibration frame (40). The bolt body (50) is conveyed to the straight vibration frame (40) after being sorted by the material straightening assembly (30). The straight vibrating frame (40) is connected to a conveying assembly (60) at one end away from the material preparation assembly (30). The conveying assembly (60) includes a flexible conveying frame (61). The flexible conveying frame (61) is provided with a conveying groove (611) for the bolt body (50) to pass through. The flexible conveying frame (61) is provided with mounting feet (612) at intervals along its extension direction on both sides. The mounting feet (612) are provided with first mounting holes (601). A detection frame (62) is slidably mounted on the flexible conveyor frame (61). A second mounting hole (602) is provided on the detection frame (62). A light shield (63) is fixedly mounted on the detection frame (62). A supplementary light (64) and a detection camera (65) are provided inside the light shield (63). A slide table (66) is also installed on the detection frame (62). When the bolt body (50) moves along the conveyor groove (611) to the slide table (66), the slide table (66) lifts the bolt body (50) and sends it into the light shield (63) for visual inspection.

2. The conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 1, characterized in that: The flexible conveyor frame (61) includes a first deformable plate (613) and a second deformable plate (614). The first deformable plate (613) and the second deformable plate (614) are provided with third mounting holes (615) at both ends. The first deformable plate (613) and the second deformable plate (614) both have longitudinal extensions (616). A bidirectional lead screw (617) is threaded between the extensions (616) on both sides. The first deformable plate (613) is provided with a slide rail (618), and the detection frame (62) slides in cooperation with the slide rail (618).

3. The conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 1, characterized in that: The testing frame (62) includes a first base (621) and a function plate (622), the second mounting hole (602) is opened on the first base (621), and the function plate (622) is slidably mounted on the first base (621); Both sides of the first seat (621) are provided with pressing modules (623). The pressing module (623) includes a first rack (6231) slidably mounted on the first seat (621). A pressing key (6232) is fixedly mounted on one end of the first rack (6231) outside the first seat (621). The other end of the first rack (6231) extends into the first seat (621) and is slidably mounted with a second sliding pin (6233). A friction block (6234) is fixedly mounted on the second sliding pin (6233). The friction block (6234) contacts the function plate (622). A second rack (6235) is fixedly installed on the friction block (6234), and a gear (6236) meshes between the first rack (6231) and the second rack (6235). The gear (6236) is rotatably installed on the inner wall of the first seat (621).

4. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 3, characterized in that: The push button (6232) is fixedly mounted with a first sliding pin (6237), and the second rack (6235) is slidably mounted on the first sliding pin (6237). The first sliding pin (6237) is provided with a transverse groove (6238) to expose the second rack (6235) to mesh with the gear (6236). The first sliding pin (6237) is fitted with a first spring (6239), and the two ends of the first spring (6239) are fixed to the outer wall surface of the pressing key (6232) and the first seat (621), respectively.

5. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 3, characterized in that: The first base (621) and the function plate (622) have corresponding notches (603) on opposite sides. The slide (66) is movably installed in the notch (603). A locking screw (661) is fixedly installed on the slide (66). A locking block (662) is threaded onto the locking screw (661) to lock the slide (66) in the notch (603).

6. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 1, characterized in that: The light shield (63) is provided with a clamping assembly (67), which includes a slider (671). A clamping cover (672) is fixedly installed on one end of the slider (671) near the opening of the light shield (63). Two clamping arms (673) are rotatably installed on the slider (671). A third spring (604) is connected between the two clamping arms (673), and the clamping ends of the clamping arms (673) extend into the clamping cover (672). A slide rod (674) is fixedly installed on the side of the slider (671) near the detection frame (62). A metal shaft (675) is fixedly installed on the slide rod (674). A photoresistor (676) is installed inside the clamping cover (672). An electromagnetic coil (677) is installed inside the light shield (63). The slide rod (674) passes through the electromagnetic coil (677). The electromagnetic coil (677) is electrically connected to the photoresistor (676).

7. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 6, characterized in that: A guide rod (678) is fixedly installed on the slider (671). One end of the guide rod (678) away from the slider (671) passes through the light shield (63). A return spring (679) is sleeved on the guide rod (678). The two ends of the return spring (679) are fixed to the stepped surface of the guide rod (678) and the outer wall of the light shield (63), respectively.

8. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 6, characterized in that: A wedge rod (631) is fixedly installed inside the light shield (63). When the slider (671) rises to the maximum stroke position, the two clamping arms (673) respectively abut against the inclined surface of the wedge rod (631).

9. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 6, characterized in that: A cylinder (68) is fixedly installed on the testing frame (62), and a partition (681) is fixedly installed on the output end of the cylinder (68). A slot (605) adapted to the partition (681) is provided on the flexible conveyor frame (61). When the bolt body (50) moves to the testing station, the partition (681) is inserted into the slot (605) to block the bolt body (50) to be tested from continuing to move forward.

10. A conveying device for producing hexagonal head bolts for rail transit vehicles according to claim 1, characterized in that: A leveling assembly (70) is installed on the frame (10). The leveling assembly (70) includes a second seat (71). An adjusting plate (72) is slidably installed on the second seat (71). A leveling plate (73) is installed on the adjusting plate (72) by bolts. The leveling plate (73) is located on the straight vibration frame (40). The second seat (71) is rotatably mounted with an adjusting screw (74), and the adjusting plate (72) is threaded onto the adjusting screw (74).

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