A pull cord alarm device for an automotive production line that is easy to maintain

Abstract

The utility model relates to the technical field of automobile production line, and disclose a kind of pull rope alarm device for automobile production line convenient to maintain, protective box is connected with access door panel by quick release structure;Alarm lamp is installed at the top of protective box;Pull rope connecting assembly includes the connecting seat of screwing fixed in the left, right, lower side of protective box and the elastic tension spring structure in the connecting seat, and elastic tension spring structure is connected with pull rope through detachable connector;Internal electronic module is installed on the modular mounting frame in protective box, and modular mounting frame can be pulled out along the guide rail in protective box or be locked by locking mechanism in protective box.The utility model is designed by modularization pull-out mounting frame and quick release door panel, realize the second-level maintenance of electronic module and access door panel, improve efficiency compared with traditional mode;Three groups of pull rope connecting assembly cooperate with elastic trigger structure, give consideration to multidirectional alarm response and anti-vibration loosening performance, adapt to complex environment of production line.

Description

Technical Field

[0001] This utility model belongs to the field of automobile production line technology, specifically relating to a pull-rope alarm device for automobile production lines that is easy to maintain. Background Technology

[0002] In the complex operating environment of automotive production lines, the reliability and ease of maintenance of safety protection devices are crucial. Traditional pull-cord alarm devices often suffer from structural design flaws, resulting in time-consuming maintenance and slow response, making it difficult to meet the demands of high-efficiency production. Therefore, there is an urgent need to develop new devices to solve these problems.

[0003] Existing pull-rope alarm devices for automobile production lines have many shortcomings: First, the internal electronic modules are mostly fixed, requiring the disassembly of a large number of parts during maintenance, which is labor-intensive and easily damages components; Second, the pull-rope connection structure is simple, requiring the entire device to be disassembled to replace the pull-rope, resulting in poor adaptability; These defects seriously affect the service life of the device and the safety and efficiency of the production line.

[0004] In view of this, we propose a pull-rope alarm device for automobile production lines that is easy to maintain to solve the above problems. Utility Model Content

[0005] The present invention aims to solve the technical problems of the prior art, which are that the fixed installation of electronic modules requires disassembly of the housing for maintenance, which is time-consuming and involves easily damaged parts; and the simple pull rope connection structure is prone to loosening, which cannot meet the requirements of high-frequency maintenance and environmental adaptability of the production line.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pull-cord alarm device for an easy-to-maintain automotive production line, comprising:

[0008] The protective enclosure has an inspection door panel connected to its front side via a quick-release mechanism.

[0009] An alarm light is installed on the top of the protective enclosure;

[0010] The pull rope connection assembly includes a connecting seat screwed to the left, right, and lower sides of the protective box and an elastic spring structure disposed in the connecting seat. The outer side of the elastic spring structure is connected to the pull rope through a detachable connector.

[0011] The internal electronic modules are mounted on modular mounting brackets within the protective enclosure. These brackets can be pulled out along guide rails inside the enclosure or locked using a locking mechanism within the enclosure. The internal electronic modules include microswitches, embedded electronic modules, and quick-connect terminal blocks mounted on the modular mounting brackets. The quick-connect terminal blocks are used for connection to external circuits.

[0012] As a preferred embodiment, the quick-release structure includes docking blocks A screwed to both sides of the protective housing, an "Ω"-shaped locking block located behind docking block A, an annular plate integral with the locking block and fixed to the rear side of docking block A, docking blocks A and B screwed to both sides of the inspection door panel, and a locking post threaded through docking block B and movable through docking block A and engaging with the locking block. By inserting a screw rod into the cross-shaped groove on the front side of the locking post, the locking post is rotated 90 degrees, disengaging from the locking block, thereby allowing the inspection door panel to be quickly removed.

[0013] Preferably, the mating block B has an internal threaded sleeve with a mating retainer threaded connection embedded in it, and the mating block A has a circular through hole through which the mating retainer passes.

[0014] Preferably, the outer end of the pull ring on the elastic spring structure is fixed with a circular block with a threaded hole, the connector is screwed into the threaded hole, and the outer side of the connector is fixedly connected to the pull rope. The end of the connector away from the pull rope and located inside the pull ring has a pin hole, and an anti-loosening pin is inserted into the pin hole.

[0015] Preferably, the locking mechanism includes a bracket fixed inside the protective housing, a pressure plate rotatably connected to a fixed shaft on the inner side of the top of the bracket and limited by a limiting plate on the inner side of the bracket, a locking screw threaded to the limiting plate and passing through a straight slot on the pressure plate, and a locking block fixed to the top of the locking screw; by rotating the locking screw, the locking block presses the pressure plate and positions it on the modular mounting bracket, thereby locking and fixing the modular mounting bracket inside the protective housing.

[0016] Preferably, the end of the pressure plate away from the fixed shaft is provided with a positioning hole. When the pressure plate presses on the modular mounting bracket, the positioning protrusion on the modular mounting bracket is inserted into the positioning hole.

[0017] Preferably, the modular mounting bracket has a positioning groove on the back, which is engaged with the support rod fixedly installed inside the protective box.

[0018] Preferably, the modular mounting bracket has an H-shaped panel structure, and the four corners of the modular mounting bracket are provided with four open sliding grooves that cooperate with the guide rails for sliding.

[0019] Compared with the prior art, the technical effects and advantages of this utility model are:

[0020] (1) This easy-to-maintain pull-rope alarm device for automobile production lines achieves its alarm function through the linkage of mechanical structure and electronic module: when the pull ropes distributed on the left, right, and lower sides of the protective box are pulled, the elastic spring structure is stretched, and the tension is transmitted through the connector to trigger the micro switch. The electrical signal is transmitted to the embedded electronic module through the quick-connect terminal block, and the module processes it to control the top alarm light to illuminate. The modular mounting bracket can be pulled along the guide rail and locked by the locking mechanism's pressure plate and positioning hole; the inspection door panel is unlocked by rotating the quick-release structure's locking pin to achieve quick disassembly. After the pull spring is triggered, it automatically resets, and the micro switch returns to its initial state, forming a closed-loop process of "pull-rope trigger - signal transmission - alarm - reset".

[0021] (2) The modular mounting bracket and guide rail pull-out structure, combined with the locking mechanism pressure plate positioning design, allow the internal electronic modules to be quickly pulled out for maintenance without tools, shortening maintenance time compared to the traditional fixed installation method; the front maintenance door panel is unlocked by rotating the quick-release structure's locking pin, and can be disassembled within 10 to 15 seconds, completely solving the tedious problem of traditional screw connections requiring one to be unscrewed one by one, and greatly improving the production line maintenance efficiency.

[0022] (3) Three sets of pull rope connection components are distributed on the left, right and lower sides of the box, which can meet the triggering requirements of different work stations on the production line. The threaded connection method with anti-loosening pins can not only adapt to various specifications of pull ropes, but also prevent the connection from loosening due to vibration through anti-loosening pins. The H-type mounting bracket, together with the surrounding positioning grooves and support rods, forms a multi-point support structure, which not only enhances the load-bearing capacity, but also ensures that the mounting bracket is stable and without jamming when pulled out through the open slide groove and guide rail, thus improving the stability of electronic module installation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a diagram showing the state of the inspection door panel after it has been removed.

[0025] Figure 3 This is a schematic diagram of the quick-release structure of this utility model;

[0026] Figure 4 This is a first exploded view of the quick-release structure of this utility model;

[0027] Figure 5 This is a first exploded view of the quick-release structure of this utility model;

[0028] Figure 6 This is a diagram illustrating the locking and unlocking process of the quick-release structure of this utility model;

[0029] Figure 7 This is a structural schematic diagram of the internal electronic module and protective housing of this utility model;

[0030] Figure 8 This is a schematic diagram of the modular mounting bracket of this utility model being pulled out from the protective box.

[0031] Figure 9 This is a schematic diagram of the modular mounting bracket of this utility model;

[0032] Figure 10 This is a schematic diagram of the locking mechanism of this utility model;

[0033] Figure 11 This is a diagram showing the unlocked state of the locking mechanism of this utility model.

[0034] Figure 12 This is a schematic diagram of the structure of the pull rope connecting assembly and the pull rope connection of this utility model;

[0035] Figure 13 This is a schematic diagram of the structure of the pull rope connection assembly and the disassembled pull rope of this utility model.

[0036] In the picture:

[0037] 1. Protective enclosure; 101. Guide rail; 102. Support rod;

[0038] 2. Inspect the door panel;

[0039] 3. Quick-release structure; 301. Connecting block A; 302. Locking block; 303. Annular plate; 304. Connecting block B; 305. Locking post; 306. Cross-shaped groove; 307. Screw rod; 308. Internal threaded sleeve; 309. Circular through hole;

[0040] 4. Alarm light;

[0041] 5. Pull rope connection assembly; 51. Connector; 52. Elastic tension spring structure; 53. Connector head; 54. Pull rope; 55. Pull ring; 56. Threaded hole; 57. Circular block; 58. Pin hole; 59. Anti-loosening pin;

[0042] 6. Internal electronic modules;

[0043] 7. Modular mounting bracket; 701. Positioning protrusion; 702. Positioning groove; 703. Open-type slide rail;

[0044] 8. Locking mechanism; 801. Bracket; 802. Fixed shaft; 803. Limiting plate; 804. Pressure plate; 805. Straight groove; 806. Locking screw; 807. Locking block; 808. Positioning hole. Detailed Implementation

[0045] 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.

[0046] Example 1

[0047] like Figures 1 to 6 As shown, a pull-cord alarm device for easy maintenance in an automotive production line includes a protective housing 1, an alarm light 4, a pull-cord connecting assembly 5, an internal electronic module 6, and a modular mounting bracket 7. The alarm light 4 is installed on the top of the protective housing 1. A maintenance door panel 2 is connected to the front of the protective housing 1 via a quick-release structure 3. The pull-cord connecting assembly 5 has three sets, which are respectively screwed and fixed to the left, right, and lower sides of the protective housing 1. The internal electronic module 6 is installed on the modular mounting bracket 7 inside the protective housing 1. The modular mounting bracket 7 can be pulled out along the guide rail 101 inside the protective housing 1 or locked by the locking mechanism 8 inside the protective housing 1.

[0048] The internal electronic module 6 is mounted on a pull-out modular mounting bracket 7, which allows for quick removal and fixation via guide rails 101 and locking mechanisms 8. This eliminates the need for complex tools, enabling the inspection and replacement of electronic components and significantly reducing maintenance time. Three sets of pull-cord connection components 5 are located on the left, right, and bottom sides of the protective housing 1, meeting the triggering needs of pull-cords 54 at different locations on the production line and improving the applicability and response efficiency of the alarm device. An alarm light 4 is installed on the top of the protective housing 1, providing both physical protection and a visual warning during alarms. The front inspection door 2 is connected via a quick-release structure 3, balancing protection and ease of maintenance.

[0049] like Figures 3 to 5 As shown, the quick-release structure 3 includes docking blocks A301 screwed to both sides of the protective box 1, an "Ω"-shaped locking block 302 located behind docking blocks A301, an annular plate 303 integral with the locking block 302 and fixed to the rear side of docking blocks A301, docking blocks A301 and B304 screwed to both sides of the inspection door panel 2, and a locking post 305 threaded through docking blocks B304 and moving through docking blocks A301 and locking with the locking block 302. By inserting a screw rod 307 into the cross-shaped groove 306 on the front side of the locking post 305, the locking post 305 is rotated 90 degrees, disengaging from the locking block 302, thereby allowing the inspection door panel 2 to be quickly removed. An internal threaded sleeve 308 is embedded in docking block B304 and threadedly connected to the locking post 305. A circular through hole 309 is provided on docking block A301 for the locking post 305 to pass through.

[0050] like Figure 6 As shown, Figure 6 In (A), the locking pin 305 is threaded through the mating block B304 and moves through the mating block A301, engaging with the locking block 302 (at this time, the screw rod 307 is inserted into the cross-shaped groove 306 on the front side of the locking pin 305). Figure 6 In (B), rotate the screw rod 307 to rotate the locking pin 305 by 90 degrees, and the locking pin 305 disengages from the locking block 302; Figure 6 (C) Move the docking block A301 upward to unlock the quick-release structure 3, so that the docking block A301 is away from the docking block B304, which makes it easy to remove the inspection door panel 2 from the protective box 1.

[0051] The quick-release structure 3 achieves locking and unlocking through the "rotation and engagement of the locking post 305". In the initial state, the locking post 305 passes through the docking block A301 and docking block B304 and engages with the rear "Ω"-shaped locking block 302. The screw rod 307 is inserted into the front cross groove of the locking post 305 to fix it in place. Rotating the screw rod 307 causes the locking post 305 to rotate 90 degrees, and the locking post 305 disengages from the engagement state of the locking block 302. Moving the docking block A301 upwards separates the docking block A301 from the docking block B304, and the inspection door panel 2 can be removed.

[0052] The access panel 2 can be quickly removed without disassembling screws; simply rotate the locking post 305 and move the connecting block upwards. This avoids the tedious process of unscrewing each screw individually, as is common in traditional screw connections. The locking post 305 and the locking block 302 engage with the internal threaded sleeve 308 and the circular through hole 309, ensuring a secure connection during normal use and preventing the panel from loosening or falling off. The quick-release structure 3 requires no additional tools, reducing maintenance difficulty and minimizing thread wear caused by frequent screw removal, thus extending the device's lifespan. The cross-shaped groove 306 and the screw rod 307 make rotation easier, and the intuitive design allows maintenance personnel to quickly master the operation.

[0053] Example 2

[0054] like Figures 1 to 6 , Figures 12 to 13 As shown, based on Embodiment 1, the pull rope connection assembly 5 includes a connecting seat 51 screwed to the left, right and lower sides of the protective box 1, and an elastic spring structure 52 provided in the connecting seat 51. The outer side of the elastic spring structure 52 is connected to the pull rope 54 through a detachable connector 53.

[0055] A circular block 57 with a threaded hole 56 is fixedly provided at the outer end of the pull ring 55 on the elastic spring structure 52. The connector 53 is screwed into the threaded hole 56, and the outer side of the connector 53 is fixedly connected to the pull rope 54. A pin hole 58 is opened at the end of the connector 53 away from the pull rope 54 and located inside the pull ring 55. An anti-loosening pin 59 is inserted into the pin hole 58. The connector 53 and the elastic spring structure 52 are connected by a thread and an anti-loosening pin 59. By pulling out the anti-loosening pin 59 and rotating the connector 53, the pull rope 54 and the elastic spring structure 52 can be quickly separated, which is convenient for maintenance and replacement.

[0056] The pull rope connection assembly 5 achieves a detachable connection between the pull rope 54 and the elastic spring structure 52 through a "threaded connection + anti-loosening pin 59": the outer end of the pull ring 55 of the elastic spring structure 52 is fixed with a circular block 57 with a threaded hole 56, and the connector 53 is screwed into the threaded hole 56 and fixed to the pull ring 55; the outer side of the connector 53 is bound to the pull rope 54, and a pin hole 58 is opened on the inner side to insert the anti-loosening pin 59 to prevent the threads from loosening; during maintenance, the anti-loosening pin 59 is pulled out and the connector 53 is rotated to separate the pull rope 54 from the elastic spring structure 52.

[0057] The pull rope 54 can be separated without tools by rotating the connector 53. Combined with the anti-loosening pin 59 design, this ensures a secure connection during normal use and allows for quick disassembly during maintenance, improving replacement efficiency. The threaded connection is compatible with different specifications of pull ropes 54; by changing the connector 53, it can accommodate multiple pull rope 54 types, reducing production line adaptation costs. After the anti-loosening pin 59 is inserted into the pin hole 58, it effectively prevents the connector 53 from rotating and loosening due to vibration or other factors, ensuring structural stability when the pull rope 54 triggers an alarm and preventing false alarms or malfunctions.

[0058] Example 3

[0059] like Figures 1 to 11 As shown, based on Embodiment 2, the locking mechanism 8 includes a bracket 801 fixed inside the protective housing 1, a pressure plate 804 rotatably connected to a fixed shaft 802 on the inner side of the top of the bracket 801 and limited by a limiting plate 803 on the inner side of the bracket 801, a locking screw 806 threadedly connected to the limiting plate 803 and passing through a straight slot 805 on the pressure plate 804, and a locking block 807 fixed to the top of the locking screw 806; by rotating the locking screw 806, the locking block 807 presses and positions the pressure plate 804 on the modular mounting frame 7, thereby locking and fixing the modular mounting frame 7 inside the protective housing 1. Figure 12 The image shows the state of the locking mechanism 8 after it is unlocked; the locking mechanism 8 is located on the modular mounting bracket 7 and has three sets arranged in a triangular pattern, such as... Figures 7 to 8 As shown;

[0060] The locking mechanism 8 fixes the modular mounting bracket 7 by rotating the screw to press the pressure plate 804. The pressure plate 804 is rotatably connected to the bracket 801 through the fixed shaft 802, and the rotation range is limited by the limiting plate 803. The locking screw 806 passes through the straight groove 805 of the pressure plate 804 and is threadedly connected to the limiting plate 803, and the top is fixed with the locking block 807. When the locking screw 806 is rotated, the locking block 807 presses down on the pressure plate 804, so that the pressure plate 804 presses the modular mounting bracket 7, and locks it in the protective box 1 by friction.

[0061] Locking and unlocking of the mounting bracket can be completed simply by rotating the locking screw 806, without the need for complex alignment or tools, making it suitable for rapid maintenance scenarios on the production line. The surface contact clamping method between the pressure plate 804 and the mounting bracket can evenly distribute the locking force, avoiding the wobbling of the mounting bracket caused by single-point force, and ensuring that the electronic module remains stable in a vibration environment. The straight slot design 805 allows the locking screw 806 and the locking block 807 to pass through, so as to unlock the pressure plate 804. The clamping force can be adjusted by the screw thread, enhancing the structural adaptability. The locking mechanism 8 is integrated inside the protective housing 1, with a compact structure that does not occupy extra space. In conjunction with the pull-out design of the guide rail 101, it realizes the convenient operation of the modular mounting bracket 7 with "pull-out and lock-on", facilitating the inspection and maintenance of the internal electronic module 6.

[0062] The end of the pressure plate 804 away from the fixed shaft 802 is provided with a positioning hole 808. When the pressure plate 804 presses on the modular mounting frame 7, the positioning protrusion 701 on the modular mounting frame 7 is inserted into the positioning hole 808.

[0063] When the pressure plate 804 is pressed down, the positioning protrusion 701 of the mounting bracket inserts into the positioning hole 808 of the pressure plate 804 to form a position, preventing the mounting bracket from moving, ensuring the accurate installation position of the electronic module, and preventing poor circuit contact due to misalignment. The cooperation between the positioning hole 808 and the positioning protrusion 701 can help the pressure plate 804 to be evenly stressed, avoid the mounting bracket from tilting when pressed at a single point, and improve the structural stability in the locked state, which is especially suitable for vibration environments on the production line.

[0064] The modular mounting bracket 7 has a positioning groove 702 on its back, which is engaged with the support rod 102 fixed inside the protective box 1. The protective box 1 is made of high-strength, corrosion-resistant alloy material and has a protective coating on its surface to improve durability. The positioning groove 702 is located around the modular mounting bracket 7, and the support rod 102 supports the modular mounting bracket 7 from all sides to improve the stability of the support.

[0065] The positioning groove 702 interlocks with the support rod 102, providing guidance during the pulling of the mounting bracket to prevent misalignment and jamming, and forming a bottom support after locking to distribute the pressure of the pressure plate 804, preventing the mounting bracket from loosening due to gravity. When the mounting bracket is inserted into the protective housing 1, the positioning groove 702 and the support rod 102 automatically align, eliminating the need for precise manual adjustment, shortening installation time, and ensuring that the mounting bracket matches the position of the guide rail 101 and locking mechanism 8 inside the housing. The alloy material can withstand collisions or accidental impacts from production line equipment, protecting the internal electronic module 6 from physical damage and extending the device's service life. The protective coating resists corrosion from oil, moisture, and chemical reagents, making it suitable for the complex environment of the automotive production line, which is dusty and humid, reducing maintenance costs caused by housing corrosion.

[0066] The modular mounting bracket 7 has an H-shaped panel structure. At its four corners are four open-type sliding grooves 703 that slide smoothly along the guide rails 101. The H-shaped panel improves bending strength through cross-section optimization while reducing material usage, ensuring load-bearing capacity when installing electronic modules while reducing overall weight and facilitating pull-out operation. The open-type sliding grooves 703 at the four corners cooperate with the guide rails 101, resulting in low frictional resistance during pull-out.

[0067] The internal electronic module 6 includes microswitches, embedded electronic modules, quick-connect terminal blocks, etc., mounted on the modular mounting bracket 7. The quick-connect terminal blocks are used to connect to external circuits.

[0068] When the pull cord 54 is pulled, it stretches the elastic spring structure 52, transmitting the tension through the connector 53, thereby triggering the contact action (closing or opening) of the micro switch. After the micro switch is activated, the generated electrical signal is transmitted to the embedded electronic module through the quick-connect terminal block; the embedded electronic module receives and processes the signal (such as amplifying and encoding), ultimately controlling the alarm light 4 to illuminate or to issue an audible and visual alarm.

[0069] The elastic spring structure 52 of the pull rope connection component 5 can automatically reset after being triggered (when not continuously pulled), and the micro switch will return to its initial state. The embedded electronic module will stop outputting the alarm signal, forming a closed-loop process of "pull rope 54 trigger - signal transmission - alarm response - reset stop".

[0070] The elastic tension spring structure 52 amplifies the minute tension of the pull rope 54, enabling the micro switch to accurately respond to light pulls and preventing alarm delays due to insufficient tension. The spring's reset characteristic ensures automatic return after triggering, preventing false alarm signal retention due to accidental touches or continuous force, thus improving the stability of the production line operation. The quick-connect terminal block enables standardized connection between the external circuitry and the internal electronic module 6. When the pull rope connection component 5 or the electronic module malfunctions, components can be quickly replaced by plugging and unplugging the terminals without complex disassembly. The embedded electronic module and micro switch are integrated on the modular mounting bracket 7, and with the pull-out structure, the entire unit can be pulled out for inspection, shortening maintenance time.

[0071] This invention achieves a technological breakthrough through modular and quick-release design. The modular mounting bracket 7, in conjunction with the guide rail 101 and locking mechanism 8, allows for rapid removal and maintenance of the electronic module; the quick-release structure 3 simplifies the door panel disassembly process and reduces maintenance time. The pull cord connection assembly 5 features a threaded design with an anti-loosening pin 59, facilitating replacement and adaptability to various specifications. In the triggering system, an elastic spring and a microswitch work together for precise response and automatic reset, combined with the embedded electronic module and quick-connect terminal block, ensuring stable signal transmission and efficient processing. Compared to traditional devices, this design significantly improves maintenance efficiency, enhances structural stability and environmental adaptability, effectively reduces the risk of failure, and provides a reliable guarantee for the safe operation of the automotive production line.

[0072] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pull-rope alarm device for an easy-to-maintain automobile production line, characterized in that, include: The protective enclosure (1) has an inspection door panel (2) connected to its front side via a quick-release structure (3); An alarm light (4) is installed on the top of the protective enclosure (1); The pull rope connection assembly (5) includes a connecting seat (51) screwed to the left, right and lower sides of the protective box (1) and an elastic spring structure (52) provided in the connecting seat (51). The outer side of the elastic spring structure (52) is connected to the pull rope (54) through a detachable connector (53). The internal electronic module (6) is installed on the modular mounting bracket (7) inside the protective enclosure (1). The modular mounting bracket (7) can be pulled out along the guide rail (101) inside the protective enclosure (1) or locked by the locking mechanism (8) inside the protective enclosure (1).

2. The easy-to-maintain pull-rope alarm device for an automobile production line according to claim 1, characterized in that: The quick-release structure (3) includes docking blocks A (301) screwed and fixed on both sides of the protective box (1), an "Ω" shaped locking block (302) located on the rear side of docking block A (301), an annular plate (303) integral with the locking block (302) and fixed on the rear side of docking block A (301), docking blocks A (301) and B (304) screwed and fixed on both sides of the maintenance door panel (2), and a locking post (305) threaded through docking block B (304) and moving through docking block A (301) and locking with the locking block (302). By inserting the screw rod (307) into the cross-shaped groove (306) on the front side of the locking post (305), the locking post (305) is rotated 90 degrees, and the locking post (305) is disengaged from the locking block (302), so that the maintenance door panel (2) can be quickly removed.

3. The easy-to-maintain pull-rope alarm device for an automobile production line according to claim 2, characterized in that: The mating block B (304) is embedded with an internal threaded sleeve (308) that is threadedly connected to the mating pin (305), and the mating block A (301) has a circular through hole (309) through which the mating pin (305) passes.

4. The easy-to-maintain pull-rope alarm device for an automobile production line according to claim 1, characterized in that: The outer end of the pull ring (55) on the elastic tension spring structure (52) is fixed with a circular block (57) with a threaded hole (56). The connector (53) is screwed into the threaded hole (56), and the outer side of the connector (53) is fixedly connected to the pull rope (54). The end of the connector (53) away from the pull rope (54) and located inside the pull ring (55) is provided with a pin hole (58), and an anti-loosening pin (59) is inserted into the pin hole (58).

5. The easy-to-maintain pull-rope alarm device for an automobile production line according to claim 1, characterized in that: The locking mechanism (8) includes a bracket (801) fixed inside the protective housing (1), a pressure plate (804) rotatably connected to the fixing shaft (802) on the inner side of the top of the bracket (801) and limited by the limiting plate (803) on the inner side of the bracket (801), a locking screw (806) threadedly connected to the limiting plate (803) and passing through the straight slot (805) on the pressure plate (804), and a locking block (807) fixed on the top of the locking screw (806). By rotating the locking screw (806), the locking block (807) presses and positions the pressure plate (804) on the modular mounting frame (7), thereby locking and fixing the modular mounting frame (7) inside the protective housing (1).

6. The pull-rope alarm device for an easy-to-maintain automobile production line according to claim 5, characterized in that: The end of the pressure plate (804) away from the fixed shaft (802) is provided with a positioning hole (808). When the pressure plate (804) presses on the modular mounting bracket (7), the positioning protrusion (701) on the modular mounting bracket (7) is inserted into the positioning hole (808).

7. A pull-rope alarm device for an easy-to-maintain automobile production line according to claim 1, characterized in that: The modular mounting bracket (7) has a positioning groove (702) on the back, which is engaged with the support rod (102) fixedly installed inside the protective box (1).

8. The easy-to-maintain pull-rope alarm device for an automobile production line according to claim 1, characterized in that: The modular mounting bracket (7) has an H-shaped panel structure. The four corners of the modular mounting bracket (7) are provided with four open-type sliding grooves (703) that cooperate with the guide rails (101) for sliding.

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