Mine ironware safety management system

By designing an iron safety management system for mining mining, using a servo motor to drive from the dynamic shaft to drive the second pull parts to extend to clean the stone, solve the problem of low efficiency of the drill breaks and the cleaning efficiency of traditional anchor rod device, to achieve realization, and realize it to achieve realization. Efficient drill cleaning and equipment protection.

CN119373442AInactive Publication Date: 2025-01-28LUOYANG XIZHI BUILDING MATERIALS CO LTD
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Patent Information

Application Number
CN202411966840.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-01-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

During mining, the drill bit is prone to break during improper operation or metal fatigue during drilling, which causes the drill bit to get stuck and cannot be taken out in time, which in turn causes belt scratches and equipment damage, and traditional anchor devices cannot be cleaned. Inefficient when arranged regularly.

Method used

A mining iron safety management system is designed, including drilling columns, drills, first pull parts, and second pull parts. It turns from the axle through the servo motor to drive the extension of the second pull parts and expands the area under the stone. And through the first pull parts and the second pull parts below the stones, to clear and pull the large range of stones.

Benefits of technology

The system can effectively improve the efficiency of drill bit, reduce the risk of equipment damage and production stagnation, and improve the cleaning efficiency of the broken drill, reducing the time and human cost during the cleaning process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to a mine ironware safety management system, in particular to the technical field of mining, the mine ironware safety management system comprises a drilling column, a drill bit, a first pulling piece and a second pulling piece, the bottom of the drilling column is fixedly connected with a driving disc, and the driving disc is connected with a plurality of driven shafts. When a broken drill bit is excavated, an operator takes a drilling column, then a control device enters the position below a plurality of stones, and when the device enters a cavity existing below the stones, a servo motor is controlled, so that a plurality of driven shafts rotate in the forward direction; then, the second pulling pieces are driven to extend under the action of the moving blocks, the second pulling pieces in multiple directions cannot continue to extend when touching the side wall of the cavity below the stone, and the second pulling pieces in other directions do not touch the side wall of the cavity below the stone and continue to extend; therefore, stones in a large range can be cleaned at a time.
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Description

Technical Field

[0001] The invention relates to the technical field of mining, and in particular to a mine ironware safety management system. Background Art

[0002] At present, in order to save costs and improve efficiency, mining is mostly carried out by explosive blasting. Before mining blasting, it is necessary to drill holes and charge charges. During the drilling process of the rock drill, the drill bit may get stuck and break due to improper operation by the operator or metal fatigue of the drill bit. If the broken drill bit is not removed in time, the drill bit will enter the production line with the ore, causing belt scratches and equipment damage, especially the cone crusher, causing huge losses to the company.

[0003] In the case where the drill bit is buried under multiple rocks, the gravel needs to be cleaned, and usually the gravel is moved away piece by piece to dig out the buried drill bit, but this method of gravel cleaning is slow. A device similar to an anchor rod can be extended under the gravel, so that the extended part is spread under the stone, and multiple gravels are cleaned by pulling. After the traditional anchor rod device is extended, the arrangement of the lower layer of gravel is irregular, which will make the anchor rod unable to be expanded (it can only be expanded to the nearest gravel), and when it is pulled outward, it cannot clean a large range of stones at one time.

[0004] In order to improve the efficiency of stone cleaning, a mine iron safety management system is proposed. Summary of the invention

[0005] In order to solve the above problems, an embodiment of the present invention provides a mine ironware safety management system, which solves the problem of low efficiency in cleaning stones mentioned in the background technology.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: a mine iron safety management system, comprising a drilling column, a drill bit, a first pulling member and a second pulling member, wherein a driving disc is fixedly connected to the bottom of the drilling column, a plurality of driven shafts are connected to the driving disc, a mounting disc is provided below the driving disc, and the drill bit is arranged below the mounting disc, wherein a fixing column is provided between the driving disc and the mounting disc, the first pulling member is fixedly connected to the fixing column, and the second pulling member is inserted into the first pulling member; The rotation of the driven shaft drives the second pulling member to extend from the first pulling member. By extending the second pulling member, the area of ​​the plurality of second pulling members under the stone can be expanded. The first pulling member and the second pulling member are spread out under the stone and pulled to clean the stone. Two pushing blocks are arranged around the driven shaft, and the pushing blocks can slide along the setting direction of the driven shaft. The two pushing blocks are connected to the same moving block through a transmission rod, and the moving block is used to drive the second pulling member to extend outside the first pulling member; The pushing block is provided with a reset mechanism, which is used to reset the transmission rod after the second pulling member extends. The reset mechanism includes a lifting block connected to the pushing block.

[0007] Furthermore, a servo motor is fixedly connected to the top of the drilling column, and an output shaft is fixedly connected to the output end of the servo motor. The servo motor can drive the driven shaft to rotate, and the output shaft can drive the driven shaft to rotate. There are multiple driven shafts, and their top ends are evenly distributed near the bottom end of the output shaft. A driving gear is fixedly connected to the outer side wall of the output shaft near the bottom end, and a plurality of driven shafts are provided with driven gears. When the output shaft rotates, the driven shaft is driven to rotate through the cooperation of the driving gear and the driven gear.

[0008] Furthermore, the pushing block is connected to the lifting block, and the lifting block and the pushing block are in contact with each other in an initial state. The lifting block can slide relative to the pushing block, and a fixed spring for resetting is provided between the two.

[0009] Furthermore, an outer wall of the driven shaft is provided with an external thread, and a side of the lifting block in contact with the driven shaft is provided with an internal thread, wherein the internal thread and the external thread are adapted to each other; A contraction column is inserted and connected to the fixed column, and a reset spring is provided between the fixed column and the contraction column. The contraction column is connected to two lifting blocks outside the same driven shaft through a connecting rod, and the other end of the contraction column is located at the front side of the moving direction of the moving block.

[0010] Furthermore, a first extension sleeve is fixedly connected inside the first pulling member, and a second extension sleeve is fixedly connected inside the second pulling member, and the second extension sleeve can extend into the first extension sleeve; A plurality of rotating rings are provided in the first extension sleeve, and the plurality of rotating rings are arranged in sequence along the setting direction of the first extension sleeve. The rotating rings are rotationally connected to the first extension sleeve, and a torsion spring for resetting is provided between the two. A movable groove is provided on the rotating ring. In an initial state, a slideway is formed between the plurality of movable grooves, and the direction of the slideway is consistent with the setting direction of the first extension sleeve.

[0011] Furthermore, a sliding ring is rotatably connected to one end of the second extension sleeve in the first extension sleeve, and a slider is provided on the sliding ring. The slider is in the slideway, and the sliding ring moves in the slideway by extending the second extension sleeve; One end of the second extension sleeve away from the first extension sleeve is fixedly connected to the limit box, a trigger rod is inserted in the limit box, a limit arc groove is provided on the trigger rod, a push rod is fixedly connected to the sliding ring, and the push rod is slidably connected to the inner side wall of the limit arc groove.

[0012] Furthermore, two limit plates are provided on the limit box, and a limit opening corresponding to the limit plate is opened on the moving block. In the initial state, the limit plate will be in the limit opening, and the front end of the trigger rod is fixedly connected with a trigger block, a trigger spring is provided between the trigger block and the limit box, and the trigger rod and the limit plate are connected by a mounting rod.

[0013] The beneficial effects of the embodiments of the present invention are: When digging for a broken drill bit, the operator picks up the drilling column and then controls the device to enter under multiple stones. When the device enters the cavity under the stone, the servo motor is controlled to make multiple driven shafts rotate in the forward direction, and then the second pulling member is extended under the action of the moving block. The second pulling members in multiple directions will not continue to extend when they touch the side wall of the cavity under the stone, while the second pulling members in other directions that do not touch the side wall of the cavity under the stone will continue to extend, thereby being able to clean up a larger range of stones at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the driven shaft of the present invention; Figure 4 It is a schematic diagram of the structure of the push block and the lifting block of the present invention; Figure 5 It is a cross-sectional view of the limit box of the present invention; Figure 6 It is a schematic structural diagram of the first extension sleeve and the second extension sleeve of the present invention; Figure 7 It is a schematic structural diagram of the trigger rod of the present invention.

[0015] In the figure: 1. drilling column; 2. driving disc; 3. output shaft; 4. driven shaft; 5. fixed column; 6. drill bit; 7. driving gear; 8. driven gear; 9. servo motor; 10. pushing block; 11. lifting block; 12. transmission rod; 13. moving block; 14. first pulling member; 15. second pulling member; 16. first extension sleeve; 17. second extension sleeve; 18. limit box; 19. rotating ring; 20. moving groove; 21. sliding ring; 22. trigger rod; 23. trigger block; 24. limit plate; 25. mounting rod; 26. limit arc groove; 27. slider; 28. trigger spring; 29. ​​contraction column; 30. reset spring; 31. connecting rod; 32. external thread; 33. internal thread. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0017] Example 1 See also Figure 1-7 A mine iron safety management system includes a drilling column 1, a drill bit 6, a first puller 14 and a second puller 15. The first puller 14 and the second puller 15 are used to extend in the cavity below a plurality of stones, and to pull apart the plurality of stones pressing the broken drill bit by pulling, and then to remove the broken drill bit pressed by the stones. The drill bit 6 is used to drive the first puller 14 and the second puller 15 of the device to partially enter the cavity formed below the stones.

[0018] The bottom of the drilling column 1 is fixedly connected with a driving disc 2, and a plurality of driven shafts 4 are connected to the driving disc 2. A mounting disc is provided below the driving disc 2, and a drill bit 6 is arranged below the mounting disc, wherein a fixing column 5 is provided between the driving disc 2 and the mounting disc, and a first pulling member 14 is fixedly connected to the fixing column 5. The fixing column 5 serves to connect the driving disc 2 and the mounting disc, and when the stone pressed on the broken drill bit is pulled, the second pulling member 15 connected to the surface thereof will extend, and the stone can be cleaned. This method can change the force direction when cleaning the stone, and can clean multiple stones at one time, which is a new method for cleaning stones.

[0019] A servo motor 9 is fixedly connected to the top of the drilling column 1, and an output shaft 3 is fixedly connected to the output end of the servo motor 9. The servo motor 9 can drive the driven shaft 4 to rotate, and the output shaft 3 can drive the driven shaft 4 to rotate. There are multiple driven shafts 4, and their top ends are evenly distributed near the bottom of the output shaft 3; wherein the number of driven shafts 4 is preferably four, evenly distributed around the output shaft 3.

[0020] The specific way in which the output shaft 3 drives the driven shaft 4 to rotate is: a driving gear 7 is fixedly connected to the outer wall of the output shaft 3 near the bottom end, and multiple driven shafts 4 are each provided with a driven gear 8. When the output shaft 3 rotates, the driven shaft 4 is driven to rotate through the cooperation of the driving gear 7 and the driven gear 8.

[0021] When the device enters the cavity formed at the bottom of multiple stones through the drill bit 6, the operator controls the servo motor 9 to drive the output shaft 3 to rotate in the forward direction through the servo motor 9. The output shaft 3 drives the driven gear 8 to rotate under the action of the driving gear 7. The rotation of the driven gear 8 causes the multiple driven shafts 4 to rotate.

[0022] An external thread 32 is provided on the outer wall of the driven shaft 4, and an internal thread 33 is provided on the side of the lifting block 11 that contacts the driven shaft 4, wherein the internal thread 33 and the external thread 32 are adapted to each other; the pushing block 10 is connected to the lifting block 11, and the lifting block 11 and the pushing block 10 are in contact with each other in the initial state, and the lifting block 11 can slide with the pushing block 10, and a fixed spring for resetting is also provided between the two.

[0023] When the driven shaft 4 rotates, the internal thread 33 and the external thread 32 are in contact with each other. The driven shaft 4 rotates, so that the two lifting blocks 11 on the same driven shaft 4 move relative to each other. Specifically, the thread directions of the internal threads 33 on the two lifting blocks 11 are opposite. Therefore, when the driven shaft 4 rotates, the two lifting blocks 11 can move relative to each other. The corresponding pushing block 10 will push the moving block 13 to move along the sliding direction of the contraction column 29 under the action of the transmission rod 12, so that the moving block 13 moves in the cavity under the stone.

[0024] Example 2 The rotation of the driven shaft 4 drives the second pulling member 15 to extend from the first pulling member 14. By extending the second pulling member 15, the area of ​​the plurality of second pulling members 15 under the stone can be expanded. The first pulling member 14 and the second pulling member 15 are spread out under the stone and pulled to clean the stone. Two push blocks 10 are arranged around the driven shaft 4. The push blocks 10 can slide along the setting direction of the driven shaft 4. The two push blocks 10 are connected to the same moving block 13 through a transmission rod 12. The moving block 13 is used to drive the second pulling member 15 to extend outside the first pulling member 14. The specific way in which the moving block 13 drives the second pulling member 15 to extend outside the first pulling member 14 is: when the pushing block 10 and the lifting block 11 move under the action of the thread, the moving block 13 will be pushed by the transmission rod 12. Since there is a limit between the limit box 18 and the moving block 13, and because the second pulling member 15 is fixedly connected to the limit box 18, when the moving block 13 moves, it will drive the second pulling member 15 to move outside the first pulling member 14, thereby realizing the process of the second pulling member 15 extending in the cavity at the bottom of the stone.

[0025] Two limit plates 24 are provided through the limit box 18, and a limit opening corresponding to the limit plate 24 is opened on the moving block 13. In the initial state, the limit plate 24 will be in the limit opening, and the front end of the trigger rod 22 is fixedly connected with a trigger block 23. A trigger spring 28 is provided between the trigger block 23 and the limit box 18, and the trigger rod 22 and the limit plate 24 are connected by a mounting rod 25.

[0026] When the limit box 18 moves with the moving block 13, when the trigger block 23 moves to a certain distance, it will contact the side wall of the cavity at the bottom of the stone, and push the trigger block 23 backward under the contact with the side wall. In the process of pushing, the trigger rod 22 will move backward. The movement of the trigger rod 22 will cause the limit plate 24 to shrink into the limit box 18 under the action of the mounting rod 25, so that there is no limit between the limit box 18 and the moving block 13. At this time, the limit box 18 can move relative to the moving block 13.

[0027] One end of the second extension sleeve 17 away from the first extension sleeve 16 is fixedly connected to the limit box 18, and a trigger rod 22 is inserted into the limit box 18. The trigger rod 22 is provided with a limit arc groove 26. A push rod is fixedly connected to the sliding ring 21, and the push rod is slidably connected to the inner side wall of the limit arc groove 26.

[0028] The second pulling member 15 is inserted in the first pulling member 14. A first extension sleeve 16 is fixedly connected in the first pulling member 14, and a second extension sleeve 17 is fixedly connected in the second pulling member 15. The second extension sleeve 17 can extend into the first extension sleeve 16; A plurality of rotating rings 19 are provided in the first extension sleeve 16. The plurality of rotating rings 19 are arranged in sequence along the setting direction of the first extension sleeve 16. The rotating rings 19 are rotationally connected to the first extension sleeve 16, and a torsion spring for resetting is provided between the two. A movable groove 20 is provided on the rotating ring 19. In an initial state, a slideway is formed between the plurality of movable grooves 20, and the direction of the slideway is consistent with the setting direction of the first extension sleeve 16.

[0029] The second extension sleeve 17 is rotatably connected to a sliding ring 21 at one end inside the first extension sleeve 16 . A slider 27 is provided on the sliding ring 21 . The slider 27 is inside the slideway. The sliding ring 21 moves inside the slideway by extending the second extension sleeve 17 .

[0030] Reference Figure 7 During the backward movement of the trigger rod 22, the limiting arc groove 26 provided on its surface enables the sliding ring 21 to rotate, and the position to which the second extension sleeve 17 slides is the position in contact with the side wall. When the sliding ring 21 rotates, the slideway is interrupted at a certain position, thereby limiting the position of the second extension sleeve 17. When the moving block 13 is reset, the second extension sleeve 17 will not retract along the slideway into the first extension sleeve 16.

[0031] Through the above steps, the second extension sleeves 17 are extended to various positions in the cavity below the stone, and can be adapted to various shapes of cavities, so that when the device is pulled later, a larger range of stones can be pulled, thereby improving the cleaning of stones covered by the buried broken drill bit.

[0032] Example 3 The pushing block 10 is provided with a reset mechanism, which is used to reset the transmission rod 12 after the second pulling member 15 is extended. The reset mechanism includes a lifting block 11 connected to the pushing block 10 .

[0033] A retracting column 29 is inserted and connected to the fixed column 5, and a return spring 30 is also arranged between the fixed column 5 and the retracting column 29. The retracting column 29 is connected to the two lifting blocks 11 outside the same driven shaft 4 through a connecting rod 31. The other end of the retracting column 29 is located at the front side of the moving direction of the moving block 13, and the connecting rod 31 is arranged in a telescopic manner. The retracting column 29 can slide relative to each other, and there is a certain friction between the two.

[0034] The retracting column 29 is used to guide the sliding direction of the moving block 13. When the trigger rod 22 in Example 2 moves backward, the extended end of the retracting column 29 will also contact the side wall synchronously. When the two pushing blocks 10 in Example 1 continue to push the moving block 13, since the lifting block 11 will be limited under the action of the pushing block 10 and the driven shaft 4, when the retracting column 29 moves forward, it will overcome the friction between the connecting rod 31 and move forward. Since the retracting column 29 will not continue to move forward after being released from the side wall of the cavity at the bottom of the stone, the retracting column 29 will push the connecting rod 31 to move backward a short distance, so that the internal thread 33 and the external thread 32 are disengaged. At this time, the continued rotation of the driven shaft 4 will not drive the moving block 13 to move forward, thereby extending the second pulling member 15 in multiple directions to the distance corresponding to the side wall, which can adapt to different cavity shapes, so that a larger range of stones can be pulled out.

[0035] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0038] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A mine ironware safety management system, characterized in that: The drilling column (1) comprises a drilling rod (1), a drill bit (6), a first pulling member (14) and a second pulling member (15), wherein a driving disc (2) is fixedly connected to the bottom of the drilling column (1), a plurality of driven shafts (4) are connected to the driving disc (2), a mounting disc is provided below the driving disc (2), the drill bit (6) is arranged below the mounting disc, a fixing column (5) is provided between the driving disc (2) and the mounting disc, the first pulling member (14) is fixedly connected to the fixing column (5), and the second pulling member (15) is inserted into the first pulling member (14); The rotation of the driven shaft (4) drives the second pulling member (15) to extend from the first pulling member (14). By extending the second pulling member (15), the area of ​​the plurality of second pulling members (15) under the stone can be expanded. The first pulling member (14) and the second pulling member (15) are spread out under the stone and pulled to clean the stone; Two pushing blocks (10) are arranged around the driven shaft (4), and the pushing blocks (10) can slide along the setting direction of the driven shaft (4). The two pushing blocks (10) are connected to the same moving block (13) via a transmission rod (12), and the moving block (13) is used to drive the second pulling member (15) to extend outside the first pulling member (14); The pushing block (10) is provided with a reset mechanism, which is used to reset the transmission rod (12) after the second pulling member (15) is extended, and the reset mechanism comprises a lifting block (11) connected to the pushing block (10).

2. A mine ironware safety management system according to claim 1, characterized in that: A servo motor (9) is fixedly connected to the top of the drilling column (1); an output end of the servo motor (9) is fixedly connected to an output shaft (3); the servo motor (9) can drive a driven shaft (4) to rotate; the output shaft (3) can drive the driven shaft (4) to rotate; there are multiple driven shafts (4), and their top ends are evenly distributed near the bottom end of the output shaft (3); A driving gear (7) is fixedly connected to the outer wall of the output shaft (3) near the bottom end, and a plurality of driven shafts (4) are each provided with a driven gear (8). When the output shaft (3) rotates, the driven shafts (4) are driven to rotate through the cooperation of the driving gear (7) and the driven gear (8).

3. A mine ironware safety management system according to claim 1, characterized in that: The pushing block (10) is connected to the lifting block (11); the lifting block (11) and the pushing block (10) are in contact with each other in an initial state; the lifting block (11) and the pushing block (10) can slide relative to each other; and a fixing spring for resetting is provided between the two.

4. A mine ironware safety management system according to claim 3, characterized in that: An external thread (32) is provided on the outer wall of the driven shaft (4), and an internal thread (33) is provided on the side of the lifting block (11) that contacts the driven shaft (4), wherein the internal thread (33) and the external thread (32) are adapted to each other; A retractable column (29) is inserted and connected to the fixed column (5), and a return spring (30) is provided between the fixed column (5) and the retractable column (29). The retractable column (29) is connected to two lifting blocks (11) on the outside of the same driven shaft (4) through a connecting rod (31), and the other end of the retractable column (29) is located at the front side of the moving direction of the moving block (13).

5. A mine ironware safety management system according to claim 1, characterized in that: A first extension sleeve (16) is fixedly connected inside the first pulling member (14), and a second extension sleeve (17) is fixedly connected inside the second pulling member (15), and the second extension sleeve (17) can extend into the first extension sleeve (16); A plurality of rotating rings (19) are arranged in the first extension sleeve (16). The plurality of rotating rings (19) are arranged in sequence along the setting direction of the first extension sleeve (16). The rotating rings (19) are rotationally connected to the first extension sleeve (16), and a torsion spring for resetting is arranged between the two. A movable groove (20) is provided on the rotating ring (19). In an initial state, a slideway is formed between the plurality of movable grooves (20), and the direction of the slideway is consistent with the setting direction of the first extension sleeve (16).

6. A mine ironware safety management system according to claim 5, characterized in that: The second extension sleeve (17) is rotatably connected to a sliding ring (21) at one end of the second extension sleeve (17) located inside the first extension sleeve (16); a sliding block (27) is provided on the sliding ring (21); the sliding block (27) is located inside the slideway; the sliding ring (21) moves inside the slideway by extending the second extension sleeve (17); One end of the second extension sleeve (17) away from the first extension sleeve (16) is fixedly connected to a limit box (18), a trigger rod (22) is inserted and connected in the limit box (18), a limit arc groove (26) is provided on the trigger rod (22), a push rod is fixedly connected to the sliding ring (21), and the push rod is slidably connected to the inner side wall of the limit arc groove (26).

7. A mine ironware safety management system according to claim 6, characterized in that: Two limit plates (24) are provided through the limit box (18), and a limit opening corresponding to the limit plate (24) is provided on the moving block (13). In an initial state, the limit plate (24) is located in the limit opening. A trigger block (23) is fixedly connected to the front end of the trigger rod (22), a trigger spring (28) is provided between the trigger block (23) and the limit box (18), and the trigger rod (22) and the limit plate (24) are connected via a mounting rod (25).

Citation Information

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