A magnetic powder spraying device for ship anchor chain crack detection
The automated magnetic powder spraying system has solved the problem of uneven spraying in the detection of cracks in ship anchor chains, achieving precise control and efficient detection, and improving the accuracy and convenience of detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN FIRSTRANK IND DEV
- Filing Date
- 2025-06-13
- Publication Date
- 2026-06-23
AI Technical Summary
In existing technologies, magnetic powder spraying devices for detecting cracks in ship anchor chains rely on manual operation, which leads to uneven spraying, affects the accuracy of detection, and makes it difficult to ensure that the amount of magnetic powder sprayed and the coverage area are consistent each time.
An automated magnetic powder spraying system was designed, comprising a base plate, casters, a magnetic powder storage tank, a stirring assembly, and a spraying device. The system achieves precise delivery and spraying of the magnetic powder suspension through a micro pump, a rotary motor, and multiple nozzles. Combined with a crack detector for real-time monitoring and feedback, the system ensures the stability and uniformity of the spraying parameters.
It achieves automated and precise control of magnetic powder spraying, significantly improving detection accuracy, reducing human error, lowering labor intensity, and providing stable detection support.
Smart Images
Figure CN224389026U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of magnetic powder spraying technology, and in particular to a magnetic powder spraying device for detecting cracks in ship anchor chains. Background Technology
[0002] Magnetic particle spraying is a key operation in magnetic particle inspection, which involves uniformly spraying magnetic powder onto the surface of the workpiece using a specific device. Utilizing the property that magnetic powder, when magnetized in a magnetic field, adheres to defects on the workpiece surface, forming visible magnetic traces, this allows for the detection of surface and near-surface defects. Early magnetic particle inspection relied heavily on manual powder application, which suffered from poor spray uniformity, low inspection efficiency, and significant reliance on operator experience. With increasing demands for precision and automation in industrial production, there is an urgent need to develop devices that can accurately control the amount, coverage, and pressure of magnetic powder spraying to meet the inspection needs of workpieces of different materials and shapes, and to promote the widespread application of magnetic particle inspection technology in aerospace, machinery manufacturing, and shipbuilding. Therefore, a magnetic particle spraying device for detecting cracks in ship anchor chains is particularly needed.
[0003] Chinese Patent CN222087639U, published on November 29, 2024, discloses a device for detecting surface cracks in galvanized steel sheets. Through the cooperation of a positioning ring, fixing components, guide pillars, pressing plates, spring-shaped plates, and connecting parts, this magnetic particle flaw detector for detecting surface cracks in galvanized steel sheets can easily fix a magnetic powder spray canister to itself. It allows for single-handed operation to control the spraying of magnetic powder from the canister onto the galvanized steel sheet surface and the contact between the two probes and the surface. This not only makes operation more convenient but also ensures no powder is missed, facilitating the detection process. However, this crack detection device requires manual operation to spray magnetic powder onto the cracks. Manual spraying relies on the operator's experience to control the force and angle, making it difficult to guarantee consistent powder quantity and coverage each time. This can easily lead to localized excessively thick or thin layers of powder. Excessive thickness may obscure minute cracks, while insufficient thickness makes the magnetic traces at the crack indistinct, affecting detection accuracy. Utility Model Content
[0004] The purpose of this invention is to provide a magnetic powder spraying device for detecting cracks in ship anchor chains, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a magnetic powder spraying device for detecting cracks in ship anchor chains, comprising a base plate, a push rod installed at one upper end of the base plate, casters installed at the bottom of the base plate, a magnetic powder storage box connected to the top of the base plate, a lifting frame connected to the other upper end of the base plate, a stirring assembly installed inside the magnetic powder storage box, a discharge pipe connected to one side of the bottom of the magnetic powder storage box, and a spraying device installed on the surface of the lifting frame;
[0006] The spraying device includes a delivery hose, one end of which is connected to the surface of the discharge pipe. A micro pump is connected to the surface of the delivery hose. A hose groove is formed in the middle of the lifting frame. A storage box is connected to the other end of the delivery hose. A guide block is connected to the back side of the storage box. Guide grooves are formed on both sides of the surface of the lifting frame. A rotary motor is connected to the top of the lifting frame. A lead screw is connected to the output end of the rotary motor. A guide rod is fixedly connected inside the guide groove. A connecting seat is connected to the surface of the storage box. A nozzle is installed on the surface of the connecting seat. A crack detector is installed on the side of the storage box.
[0007] Preferably, multiple identical sets of the casters are provided at the bottom of the base plate, and are symmetrically distributed at the four corners of the bottom of the base plate with respect to the central axis of the base plate.
[0008] Preferably, the stirring assembly includes an injection port connected to the upper end of the magnetic powder storage tank. A motor housing is connected to the top center of the magnetic powder storage tank. A stirring motor is installed inside the motor housing. A stirring shaft is connected to the output end of the stirring motor. A stirring rod is connected to the surface of the stirring shaft. A guide plate is connected to the surface of the stirring rod. A scraper is connected to the surface of the guide plate. A fixing rod is connected to the bottom side of the stirring shaft. An installation groove is formed inside the fixing rod. A connecting rod is installed inside the installation groove. A telescopic groove is formed on the side of the connecting rod. A compression spring is connected to the inner end of the telescopic groove. A retaining plate is connected to the outer end of the compression spring. A retaining groove is formed inside the installation groove. A brush is connected to the surface of the connecting rod.
[0009] Preferably, the stirring rollers are provided with multiple identical sets on the surface of the stirring shaft, and the scrapers are provided with multiple identical sets on the surface of the guide plate, with the other end of the scrapers attached to the inner surface of the magnetic powder storage box.
[0010] Preferably, multiple identical sets of compression springs are arranged inside the telescopic groove, and the outer wall dimensions of the card plate match the inner wall dimensions of the card groove.
[0011] Preferably, the storage box slides up and down on the surface of the lifting frame via a guide block and a guide groove. The guide groove has two identical sets, one set of which is rotatably connected to a lead screw, and the other set is fixedly connected to a guide rod.
[0012] Preferably, the nozzles are distributed in multiple groups at equal intervals around the center of the connecting seat, and the crack detectors are symmetrically distributed on both sides of the storage box with respect to the central axis of the storage box.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This magnetic powder spraying device for detecting cracks in ship anchor chains achieves automated and precise control of magnetic powder spraying through the setting of the spraying device. The micro pump precisely regulates the delivery volume of the magnetic powder suspension, and with multiple sets of surrounding nozzles, it can stably output magnetic powder according to preset parameters, avoiding the problem of uneven spraying caused by manual operation force and angle deviation. It effectively prevents the situation where the local magnetic powder is too thick to cover the crack or too thin to make the magnetic mark invisible, significantly improving the detection accuracy, reducing the dependence on the operator's experience, reducing human error, and reducing labor intensity, providing stable and reliable technical support for the detection of cracks in ship anchor chains. Attached Figure Description
[0014] Figure 1 This is a side view of the structure of the present utility model;
[0015] Figure 2 This is a schematic diagram of the stirring assembly structure of this utility model;
[0016] Figure 3 This is a schematic diagram of the structure of the delivery hose and the micro pump of this utility model in cooperation;
[0017] Figure 4 This is a schematic diagram of the spraying device of this utility model;
[0018] Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the middle.
[0019] In the diagram: 1. Base plate; 2. Push rod; 3. Casters; 4. Magnetic powder storage box; 5. Lifting frame; 6. Mixing assembly; 601. Inlet; 602. Motor housing; 603. Mixing motor; 604. Mixing shaft; 605. Mixing roller; 606. Guide plate; 607. Scraper; 608. Fixing rod; 609. Mounting groove; 610. Connecting rod; 611. Telescopic groove; 612. Compression spring; 613. Clamping plate; 614. Clamping slot; 615. Brush; 7. Discharge pipe; 8. Spraying device; 801. Conveying hose; 802. Micro pump; 803. Hose chute; 804. Storage box; 805. Guide block; 806. Guide groove; 807. Rotary motor; 808. Lead screw; 809. Guide rod; 810. Connecting seat; 811. Nozzle; 812. Crack detector. Detailed Implementation
[0020] 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.
[0021] Please see Figure 1-5 This utility model provides a technical solution: a magnetic powder spraying device for detecting cracks in ship anchor chains, including a base plate 1, a push rod 2 installed at one upper end of the base plate 1, a caster wheel 3 installed at the bottom of the base plate 1, a magnetic powder storage box 4 connected to the top of the base plate 1, a lifting frame 5 connected to the other upper end of the base plate 1, a stirring assembly 6 installed inside the magnetic powder storage box 4, a discharge pipe 7 connected to one side of the bottom of the magnetic powder storage box 4, and a spraying device 8 installed on the surface of the lifting frame 5;
[0022] The spraying device 8 includes a delivery hose 801, one end of which is connected to the surface of the discharge pipe 7. A micro pump 802 is connected to the surface of the delivery hose 801. A hose groove 803 is provided in the middle of the lifting frame 5. The other end of the delivery hose 801 is connected to a storage box 804. A guide block 805 is connected to the back side of the storage box 804. Guide grooves 806 are provided on both sides of the surface of the lifting frame 5. A rotary motor 807 is connected to the top of the lifting frame 5. A lead screw 808 is connected to the output end of the rotary motor 807. A guide rod 809 is fixedly connected inside the guide groove 806. A connecting seat 810 is connected to the surface of the storage box 804, and a nozzle 811 is mounted on the surface of the connecting seat 810. A crack detector 812 is mounted on the side of the storage box 804. Through the configuration of the spraying device 8, when the ship anchor chain crack detection work is started, the spraying device 8 achieves precise magnetic powder spraying through the coordinated operation of multiple components. After the micro pump 802 is started, it generates suction, drawing the magnetic powder suspension, which has been thoroughly mixed by the stirring component 6, from the magnetic powder storage box 4 into the delivery hose 801 through the discharge pipe 7. The delivery hose 801 has good flexibility and can be flexibly arranged within the hose groove 803. To ensure the smooth delivery of the magnetic powder suspension to the storage box 804, the rotary motor 807 is energized and rotates, driving the lead screw 808 to rotate. The guide block 805 on the back side of the storage box 804 is embedded in the guide grooves 806 on both sides of the lifting frame 5, cooperating with the guide rod 809, so that the storage box 804, driven by the lead screw 808, achieves stable up-and-down linear movement along the lifting frame 5. The position of the nozzle 811 can be flexibly adjusted according to parameters such as the height and diameter of the anchor chain. After the magnetic powder suspension enters the storage box 804, it is evenly distributed to the nozzle 811 through the connecting seat 810. The nozzle 811 sprays according to the set spray parameters. The magnetic powder suspension is sprayed onto the anchor chain surface at a suitable angle and flow rate. During the spraying process, the crack detector 812 works simultaneously to monitor the surface condition of the anchor chain in real time. When a crack is detected, the control system can provide feedback to adjust the spraying volume or angle of the nozzle 811 to ensure that the crack is fully covered by magnetic powder. Throughout the process, the various components of the spraying device 8 work together to achieve fully automated control of the magnetic powder suspension from storage and transportation to precise spraying. Combined with the real-time monitoring of the crack detector 812, the efficiency and accuracy of crack detection in ship anchor chains are effectively improved.
[0023] Furthermore, multiple sets of casters 3 are installed at the bottom of the base plate 1, symmetrically distributed at the four corners of the bottom of the base plate 1 along the central axis of the base plate 1. Through the installation of casters 3, multiple sets of casters symmetrically distributed at the four corners of the base plate 1 can achieve 360-degree free rotation of the device. Operators can easily move the device in complex sites such as ship decks with the help of push rods 2, flexibly adjust the detection position, and accurately align with the anchor chain to be detected. At the same time, the distribution of casters ensures that the device is evenly stressed, ensuring a smooth movement process and preventing magnetic powder from settling in the magnetic powder storage box 4 or loosening of the spraying device 8 due to bumps. In addition, the built-in braking function of the casters can quickly lock the device after reaching the detection position, preventing the device from accidentally sliding during the detection process, providing a stable working environment for magnetic powder spraying and crack detection, and significantly improving the convenience and reliability of the detection operation.
[0024] Furthermore, the stirring assembly 6 includes an injection port 601, which is connected to the upper end of the magnetic powder storage tank 4. A motor housing 602 is connected to the center of the top of the magnetic powder storage tank 4. An stirring motor 603 is installed inside the motor housing 602. An stirring shaft 604 is connected to the output end of the stirring motor 603. A stirring rod 605 is connected to the surface of the stirring shaft 604. A guide plate 606 is connected to the surface of the stirring rod 605. A scraper 607 is connected to the surface of the guide plate 606. A fixing rod 608 is connected to the bottom side of the stirring shaft 604. The fixing rod 608 has an internal opening... An installation groove 609 is provided, and a connecting rod 610 is installed on the inner side of the installation groove 609. A telescopic groove 611 is opened on the side of the connecting rod 610. A compression spring 612 is connected to the inner end of the telescopic groove 611, and a retaining plate 613 is connected to the outer end of the compression spring 612. A retaining groove 614 is opened on the inner side of the installation groove 609. A brush 615 is connected to the surface of the connecting rod 610. With the setting of the stirring assembly 6, after the stirring assembly 6 is started, the magnetic powder and the carrier liquid enter the magnetic powder storage tank 4 through the injection port 601. The stirring motor 603 is energized to drive the stirring shaft 604 to rotate, driving the stirring roller. 605 and the guide plate 606 rotate together. The unique curved design of the guide plate 606 causes the magnetic powder suspension in the tank to circulate, accelerating the dispersion of the magnetic powder. The stirring rod 605 breaks up the magnetic powder agglomerates through stirring and shearing force, ensuring that the magnetic powder is evenly suspended in the carrier liquid. The scraper 607 is close to the inner wall of the storage tank 4, scraping off the attached magnetic powder during the stirring process to prevent the magnetic powder from accumulating and affecting the stirring effect. When the stirring shaft 604 rotates, the fixed rod 608 drives the connecting rod 610 to rotate around the axis, and the brush 615 cleans the bottom of the tank to prevent the magnetic powder from settling. Under the action of centrifugal force, the plate... 613 overcomes the elastic force of the compression spring 612, pops out from the telescopic groove 611 and locks into the slot 614, so that the connecting rod 610 is stably extended, ensuring that the brush 615 maintains an effective contact distance with the bottom of the box. When the stirring shaft 604 stops rotating and the centrifugal force disappears, the compression spring 612 pushes the card plate 613 to retract into the telescopic groove 611, and the connecting rod 610 is folded up, which facilitates the inspection and maintenance of the stirring assembly 6. Through the coordinated work of multiple components, the stirring assembly 6 can not only ensure the uniform mixing of the magnetic powder suspension, but also effectively prevent the magnetic powder from depositing and adhering, providing a stable magnetic powder suspension for subsequent precise spraying.
[0025] Furthermore, multiple sets of stirring rollers 605 are arranged on the surface of the stirring shaft 604, and multiple sets of scraper strips 607 are arranged on the surface of the guide plate 606. The other end of the scraper strips 607 is attached to the inner surface of the magnetic powder storage tank 4. Through the arrangement of stirring rollers 605, guide plate 606 and scraper strips 607, multiple sets of stirring rollers 605 are distributed at different angles on the surface of the stirring shaft 604 to form a multi-layer stirring zone. When rotating, multi-dimensional stirring force is generated, which accelerates the mixing of magnetic powder and carrier liquid and significantly improves the magnetic powder dispersion efficiency. The guide plate 606 changes the flow direction of the magnetic powder suspension, which promotes the formation of a circulating vortex in the storage tank to ensure that the magnetic powder is evenly dispersed in each area and avoids mixing dead zones. Multiple sets of scraper strips 607 are closely attached to the inner wall of the magnetic powder storage tank 4 and continuously scrape off the attached magnetic powder during the stirring process to prevent the magnetic powder from accumulating and agglomerating, maintain the consistency of the magnetic powder suspension concentration in the tank and provide a stable magnetic powder suspension for precise spraying.
[0026] Furthermore, multiple sets of compression springs 612 are arranged inside the telescopic groove 611. The outer wall size of the clamping plate 613 matches the inner wall size of the clamping groove 614. Through the arrangement of compression springs 612, clamping plate 613 and clamping groove 614, multiple sets of compression springs 612 provide stable elastic support for clamping plate 613. When the stirring shaft 604 rotates and generates centrifugal force, clamping plate 613 overcomes the spring force and pops out and embeds into clamping groove 614, so that connecting rod 610 is stably unfolded, ensuring that brush 615 maintains appropriate contact pressure with the bottom of the box, effectively cleaning the magnetic powder deposited at the bottom of the box. When the stirring shaft stops rotating and the centrifugal force disappears, compression spring 612 quickly pulls clamping plate 613 back into telescopic groove 611, realizing automatic folding of connecting rod 610, which facilitates cleaning and maintenance of stirring components, and avoids interference between components when not in operation.
[0027] Furthermore, the storage box 804 slides up and down on the surface of the lifting frame 5 via the guide block 805 and the guide groove 806. The guide groove 806 is provided with two identical sets. One set is rotatably connected to the lead screw 808, and the other set is fixedly connected to the guide rod 809. Through the arrangement of the guide block 805, guide groove 806, lead screw 808 and guide rod 809, the cooperation between the guide block 805 and the guide groove 806 provides precise guidance for the movement of the storage box 804, preventing it from deviating or shaking during the lifting process. The double-track structure of the lead screw 808 and the guide rod 809 enables the storage box 804 to achieve stable up and down linear movement under the drive of the rotary motor. The lead screw 808 provides lifting power, and the guide rod 809 enhances structural stability, ensuring that the nozzle 811 can accurately adjust its position according to parameters such as the height and diameter of the anchor chain, realizing all-round and uniform spraying of magnetic powder, while providing a stable detection angle for the crack detector 812.
[0028] Furthermore, multiple sets of nozzles 811 are evenly distributed around the center of the connecting seat 810, and crack detectors 812 are symmetrically distributed on both sides of the storage box 804 along the central axis of the storage box 804. Through the arrangement of nozzles 811 and crack detectors 812, the multiple sets of nozzles 811 distributed around the center can spray magnetic powder onto the anchor chain from multiple angles simultaneously, forming a 360-degree full-coverage spraying effect. This ensures that magnetic powder is evenly attached to every part of the anchor chain surface, improving the accuracy of crack detection. The crack detectors 812, symmetrically distributed on both sides of the storage box 804, can monitor the anchor chain surface from two perspectives in real time, promptly capturing the accumulation of magnetic powder at the crack. When a crack is detected, the control system can provide feedback information to adjust the spray volume or spray angle of the nozzles 811, focusing the spray on the cracked area and improving the efficiency and reliability of crack detection.
[0029] Working principle: First, the operator pushes the push rod 2, and with the help of the omnidirectional wheels 3 symmetrically distributed at the four corners of the base plate 1, moves the device flexibly to the anchor chain to be inspected and brakes and locks it. Then, the magnetic powder and carrier liquid are injected into the magnetic powder storage tank 4 through the injection port 601. The stirring assembly 6 is started, the stirring motor 603 drives the stirring shaft 604 to rotate, multiple sets of stirring rollers 605 generate multi-dimensional stirring force, the guide plate 606 guides the magnetic powder suspension to form a circulating vortex, the scraper 607 simultaneously scrapes off the magnetic powder on the tank wall, and the brush 615 automatically unfolds under the action of centrifugal force to clean the bottom of the tank, ensuring that the magnetic powder is evenly dispersed and suspended. During testing, the micro pump 802 generates suction, and transports the evenly mixed magnetic powder suspension along the discharge pipe 7 and the conveying hose 801 to the storage box 804. The rotary motor 807 drives the lead screw Rotating 808, with the cooperation of guide block 805, guide groove 806, and guide rod 809, precisely adjusts the height of storage box 804, aligning the surrounding nozzles 811 with the anchor chain. The nozzles 811 spray the magnetic powder suspension evenly from multiple angles according to preset parameters. Simultaneously, symmetrically distributed crack detectors 812 monitor the anchor chain surface in real time from two perspectives. Once a signal of magnetic powder accumulation at the crack is captured, it is immediately fed back to the control system, dynamically adjusting the spray volume and angle of the nozzles 811 to achieve focused coverage of the crack area. Ultimately, the entire process of magnetic powder mixing, precise spraying, and intelligent detection is automated, significantly improving the efficiency and accuracy of ship anchor chain crack detection. This completes the application process of a magnetic powder spraying device for ship anchor chain crack detection.
[0030] 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 magnetic powder spraying device for detecting a crack in a ship's anchor chain, comprising a base plate (1), characterized in that: A push rod (2) is installed at one end of the upper part of the base plate (1), a caster wheel (3) is installed at the bottom of the base plate (1), a magnetic powder storage box (4) is connected to the upper part of the base plate (1), a lifting frame (5) is connected to the other end of the upper part of the base plate (1), a stirring assembly (6) is provided inside the magnetic powder storage box (4), a discharge pipe (7) is connected to one side of the bottom of the magnetic powder storage box (4), and a spraying device (8) is provided on the surface of the lifting frame (5). The spraying device (8) includes a delivery hose (801), one end of which is connected to the surface of the discharge pipe (7). A micro pump (802) is connected to the surface of the delivery hose (801). A hose groove (803) is provided in the middle of the lifting frame (5). The other end of the delivery hose (801) is connected to a storage box (804). A guide block (805) is connected to the back side of the storage box (804). Openings are provided on both sides of the surface of the lifting frame (5). The device is provided with a guide groove (806), a rotary motor (807) is connected to the top of the lifting frame (5), a lead screw (808) is connected to the output end of the rotary motor (807), a guide rod (809) is fixedly connected inside the guide groove (806), a connecting seat (810) is connected to the surface of the storage box (804), a nozzle (811) is installed on the surface of the connecting seat (810), and a crack detector (812) is installed on the side of the storage box (804).
2. The magnetic powder spraying device for detecting cracks in ship anchor chains according to claim 1, characterized in that: The universal wheels (3) are provided in multiple identical sets at the bottom of the base plate (1), and are symmetrically distributed at the four corners of the bottom of the base plate (1) with respect to the central axis of the base plate (1).
3. The magnetic powder spraying device for detecting cracks in ship anchor chains according to claim 1, characterized in that: The stirring assembly (6) includes an injection port (601) connected to the upper end of the magnetic powder storage tank (4). A motor housing (602) is connected to the center of the top of the magnetic powder storage tank (4). A stirring motor (603) is installed inside the motor housing (602). A stirring shaft (604) is connected to the output end of the stirring motor (603). A stirring rod (605) is connected to the surface of the stirring shaft (604). A guide plate (606) is connected to the surface of the stirring rod (605). A scraper (607) is connected to the surface of the guide plate (606). A fixing rod (608) is connected to the bottom side of the stirring shaft (604). An installation groove (609) is provided inside the fixing rod (608). A connecting rod (610) is installed inside the installation groove (609). A telescopic groove (611) is provided on the side of the connecting rod (610). A compression spring (612) is connected to the inner end of the telescopic groove (611). A retaining plate (613) is connected to the outer end of the compression spring (612). A retaining groove (614) is provided inside the installation groove (609). A brush (615) is connected to the surface of the connecting rod (610).
4. The magnetic powder spraying device for detecting cracks in ship anchor chains according to claim 3, characterized in that: The stirring roller (605) is provided with multiple identical sets on the surface of the stirring shaft (604), and the scraper (607) is provided with multiple identical sets on the surface of the guide plate (606), with the other end of the scraper (607) attached to the inner surface of the magnetic powder storage box (4).
5. A magnetic powder spraying device for detecting cracks in ship anchor chains according to claim 3, characterized in that: Multiple identical sets of compression springs (612) are provided inside the telescopic groove (611), and the outer wall size of the card plate (613) matches the inner wall size of the card groove (614).
6. The magnetic powder spraying device for detecting cracks in ship anchor chains according to claim 1, characterized in that: The storage box (804) slides up and down on the surface of the lifting frame (5) via the guide block (805) and the guide groove (806). The guide groove (806) is provided with two identical sets, one set of which is rotatably connected to the lead screw (808), and the other set is fixedly connected to the guide rod (809).
7. The magnetic powder spraying device for detecting cracks in ship anchor chains according to claim 1, characterized in that: The nozzles (811) are distributed in multiple groups at equal intervals around the center of the connecting seat (810), and the crack detectors (812) are symmetrically distributed on both sides of the storage box (804) with respect to the central axis of the storage box (804).