A boarding ladder locking device

Abstract

The utility model discloses a boarding ladder locking device, include: connecting rod mechanism, spring slide bar, sliding seat and locking seat, sliding seat fixed connection mining excavator's walk platform's side wall, spring slide bar sliding connection sliding seat, be equipped with return spring between spring slide bar and sliding seat, locking seat set up in boarding ladder close walk platform one side, when boarding ladder is taken in, one end of spring slide bar is jointed with locking seat, and the rotation of boarding ladder is limited and falls back, and the other end of spring slide bar is connected connecting rod mechanism. The utility model discloses a structure through setting connecting rod mechanism, spring slide bar, sliding seat and locking seat, through one end of spring slide bar and locking seat joint, limit the rotation of boarding ladder and fall back, realized the automatic reliable locking of boarding ladder under the condition of taking in, effectively prevented the sudden drop of boarding ladder due to the cylinder failure or gas path problem, solved the complex structure of existing locking device, inconvenient operation and the problem of relying on electrical control, improved security and practicality.

Description

Technical Field

[0001] This utility model relates to the field of mining excavator technology, and in particular to a boarding ladder locking device. Background Technology

[0002] The boarding ladder is an essential component of mining excavators, allowing workers to move up and down the platform. The main structural forms of boarding ladders include telescopic ladders and swing ladders. Mining excavators mostly use swing ladders, which rely on a cylinder to extend and retract, rotating the ladder at approximately 50°. The maximum and minimum displacements of the cylinder's extension rod correspond to the ladder's retraction and landing, respectively. When the ladder is retracted (in a horizontal position), the slewing platform can rotate. When the ladder is on the ground, workers use the platform and the ladder itself to access the equipment.

[0003] During the operation of a mining excavator, cylinder failure or air circuit problems may cause the loading ladder to suddenly fall. A sudden fall of the loading ladder during the operation of a mining excavator can damage the ladder and even the excavator's chassis.

[0004] While some locking devices exist for boarding stairs in the existing technology, they are often complex in structure, inconvenient to operate, and even require electrical control coordination, making it impossible to achieve automatic and reliable locking that is easy to operate and simple in structure. Utility Model Content

[0005] In view of the shortcomings of the prior art, the present invention provides a boarding ladder locking device to solve at least one of the above-mentioned technical problems.

[0006] This utility model provides the following technical solution: A boarding ladder locking device includes: a linkage mechanism, a spring slide rod, a sliding seat, and a locking seat; the sliding seat is fixedly connected to the side wall of the walkway of a mining excavator, the spring slide rod is slidably connected to the sliding seat, a return spring is provided between the spring slide rod and the sliding seat, and the locking seat is located on the side of the boarding ladder near the walkway. When the boarding ladder is retracted, one end of the spring slide rod engages with the locking seat to restrict the rotation and descent of the boarding ladder, and the other end of the spring slide rod is connected to the linkage mechanism.

[0007] In one embodiment, the locking seat has a guide surface on the side facing the spring slide rod. When the boarding ladder is retracted, the end of the spring slide rod moves along the guide surface and compresses the return spring. The end of the guide surface has a locking protrusion. When the end of the spring slide rod passes the highest point of the locking protrusion, the spring slide rod forms a limiting engagement with the bottom surface of the locking protrusion under the reset action of the return spring.

[0008] In one embodiment, the end of the spring slide that is connected to the locking seat is provided with a roller, which is configured to roll into contact with the guide surface during the retraction of the boarding ladder.

[0009] In one embodiment, the locking seat has a guide surface on the side facing the spring slide rod. When the boarding ladder is retracted, the end of the spring slide rod moves along the guide surface and compresses the return spring. A pin hole is provided at the highest point of the end of the guide surface, and a positioning pin is provided at the end of the spring slide rod that is connected to the locking seat. When the boarding ladder is retracted, the positioning pin moves along the guide surface and compresses the return spring until it reaches the pin hole position, where it is inserted into the pin hole under the reset action of the return spring.

[0010] In one embodiment, the linkage mechanism includes a fixed base, a first link, and a second link. The fixed base is fixed to the side wall of the walkway. The middle part of the first link is rotatably connected to the fixed base through a pivot, so that the first link can swing around the pivot. One end of the second link is hinged to the first link, and the other end is hinged to the spring slide rod.

[0011] In one embodiment, the end of the first link away from the second link is connected to a rocker arm that bends to one side, and the rocker arm is horizontally positioned.

[0012] In one embodiment, the top surface of the rocker arm forms a tread surface, and the surface of the tread surface is provided with an anti-slip structure, which is a pressed mesh anti-slip texture or an inlaid rubber anti-slip pad.

[0013] In one embodiment, the rod body of the second connecting rod is made of a hollow round tube or a hollow square tube.

[0014] In one embodiment, the boarding ladder locking device further includes a limiting mechanism for fixing the linkage mechanism after the boarding ladder is retracted. The limiting mechanism includes a limiting seat fixed to the linkage mechanism, a ring seat fixed to the side wall of the walkway, and a limiting ring rotatably connected to the ring seat. The limiting seat is provided with a limiting groove corresponding to the limiting ring, and the limiting ring can be rotated to engage with the limiting groove.

[0015] In one embodiment, the sliding seat includes a cylindrical structure open at both ends and a mounting seat connected to the cylindrical structure. One end of the cylindrical structure is detachably connected to a cover by a thread. The center of the cover has a slide rod hole for the spring slide rod to pass through. The return spring is provided inside the cylindrical structure. The mounting seat has a plurality of mounting holes.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention, through a structure comprising a linkage mechanism, a spring slide rod, a sliding seat, and a locking seat, restricts the rotation and descent of the boarding ladder by engaging one end of the spring slide rod with the locking seat. This achieves automatic and reliable locking of the boarding ladder in the retracted state, effectively preventing sudden falls of the boarding ladder due to cylinder failure or air circuit problems. This avoids damage to the boarding ladder or the chassis of the mining excavator, and solves the problems of complex structure, inconvenient operation, and reliance on electrical control in existing locking devices, thus improving safety and practicality. Attached Figure Description

[0017] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the structure of the boarding ladder locking device provided by this utility model when the boarding ladder is lowered; Figure 2 A schematic diagram of the boarding ladder locking device provided by this utility model when the boarding ladder is retracted; Figure 3 A top view of the installation position of the boarding ladder locking device provided by this utility model; Figure 4 A schematic diagram of the structure of the boarding ladder locking device provided by this utility model; Figure 5 for Figure 4 Sectional view at point AA; Figure 6 for Figure 4 A schematic diagram of the B-direction structure of the middle limiting mechanism; Figure 7 This is a schematic diagram of the locking seat.

[0019] Figure label: 1. Linkage mechanism; 11. First link; 12. Second link; 13. Rocker arm; 2. Fixed base; 21. Rotating shaft; 3. Spring slide bar; 31. Return spring; 32. Rotating wheel; 4. Sliding seat; 41. Cover; 5. Locking seat; 51. Guide surface; 52. Locking protrusion; 6. Limiting mechanism; 61. Limiting seat; 62. Limiting ring; 63. Ring seat; 7. Boarding stairs; 8. Walking on stage; 9. Cylinder. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a joint; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0026] The following will be combined with the appendix Figures 1 to 7 The present invention will be further described below.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, mining excavators often use a swing ladder design, relying on a cylinder 9 to extend and retract, driving the boarding ladder 7 to rotate at an angle of approximately 50°. The boarding ladder 7 is rotatably connected to the slewing platform of the mining excavator, which also has a walkway 8. When the boarding ladder 7 is retracted, it lies parallel to one side of the walkway 8. The locking device for the boarding ladder 7 provided by this utility model is respectively installed on two opposite sides of the walkway 8 and the boarding ladder 7. The locking device for the boarding ladder 7 includes: a linkage mechanism 1, a spring slide rod 3, a sliding seat 4, and a locking seat 5. The sliding seat 4 is fixedly connected to the side wall of the platform 8 of the mining excavator. A spring slide rod 3 that can slide laterally is installed through the sliding seat 4. A return spring 31 that provides a return force is provided between the spring slide rod 3 and the sliding seat 4. The locking seat 5 is located on the side of the boarding ladder 7 near the platform 8. When the boarding ladder 7 is retracted, one end of the spring slide rod 3 engages with the locking seat 5, restricting the rotation and descent of the boarding ladder 7. The other end of the spring slide rod 3 is connected to the linkage mechanism 1. By operating the linkage mechanism 1, the spring slide rod 3 can be retracted laterally, realizing one-button unlocking. By setting a locking structure in which the linkage mechanism 1 drives the spring slide rod 3 to engage with the locking seat 5, the functions of automatic locking and operation-linked unlocking after the boarding ladder 7 is retracted are realized.

[0028] In some implementations, such as Figure 7As shown, the locking seat 5 has an inclined guide surface 51 on the side facing the spring slide rod 3, and a locking protrusion 52 is provided at the end of the guide surface 51. When the boarding ladder 7 is retracted, the end of the spring slide rod 3 moves along the guide surface 51 and compresses the return spring 31. When the end of the spring slide rod 3 passes the highest point of the locking protrusion 52, the spring slide rod 3 forms a limiting fit with the bottom surface of the locking protrusion 52 under the return action of the return spring 31. By setting the structure of the locking seat 5 with the guide surface 51 and the locking protrusion 52, the automatic guidance and over-the-top locking effect when the boarding ladder 7 is retracted is achieved, solving the problems of traditional locking devices requiring manual intervention and unreliable locking.

[0029] In some implementations, such as Figure 4 and Figure 5 As shown, a rotating wheel 32 is provided at the end where the spring slide rod 3 is combined with the locking seat 5. The rotating wheel 32 is configured to roll into contact with the guide surface 51 during the retraction of the boarding ladder 7, thereby changing the original sliding friction into rolling friction. This allows the spring slide rod 3 to slide more smoothly along the guide surface 51 and compress the return spring 31 until the rotating wheel 32 passes the highest point of the locking protrusion 52 and then quickly falls into the locked position under the action of the return spring 31. This utility model reduces friction and wear on the end of the spring slide rod 3 by adding a rotating wheel 32 to the end of the spring slide rod 3.

[0030] In some embodiments, the locking seat 5 has a guide surface 51 on the side facing the spring slide rod 3. When the boarding ladder 7 is retracted, the end of the spring slide rod 3 moves along the guide surface 51 and compresses the return spring 31. A pin hole is provided at the highest point of the end of the guide surface 51. Correspondingly, a positioning pin (not shown in the figure) is provided at the end of the spring slide rod 3 that is connected to the locking seat 5. When the boarding ladder 7 is retracted, the positioning pin moves along the guide surface 51 and compresses the return spring 31 until it reaches the pin hole position. Under the reset action of the return spring 31, it is inserted into the pin hole to form a firm pin-type lock. By setting a pin-locking structure guided by the guide surface 51 and with the positioning pin and pin hole cooperating with each other, the precise positioning of the locking position when the boarding ladder 7 is retracted is achieved, and the boarding ladder 7 is kept in a locked state without shaking.

[0031] In some implementations, such as Figure 1 , Figure 2 and Figure 4As shown, the linkage mechanism 1 includes a fixed base 2, a first link 11, and a second link 12. The fixed base 2 is fixed to the side wall of the walkway 8. The middle part of the first link 11 is rotatably connected to the fixed base 2 via a pivot 21, allowing the first link 11 to swing around the pivot 21. The upper end of the first link 11 is set higher than the walkway 8. One end of the second link 12 is hinged to the first link 11, and the other end is hinged to a spring slide rod 3, thereby converting the swing of the first link 11 into the pulling of the second link 12, ultimately forming a linear pull on the spring slide rod 3. When the spring slide rod 3 is pulled, the return spring 31 is compressed, causing the spring slide rod 3 to be pulled away from the locking seat 5, releasing the locking and positioning of the boarding ladder 7, and then the boarding ladder 7 can be lowered.

[0032] This utility model, by setting up a linkage mechanism 1 with a fixed base 2 providing support, a first connecting rod 11 as a force-saving lever, and a second connecting rod 12 for power transmission, enables the operator to easily apply a small force above the platform 8 to control the sliding of the spring slide rod 3 to unlock the device.

[0033] In some implementations, such as Figure 4 As shown, the end of the first link 11 away from the second link 12 is connected to a rocker arm 13 that bends to one side, and the rocker arm 13 is set horizontally. The rocker arm 13 and the first link 11 form an L-shaped operating part that is easy to grip or step on; by horizontally moving or stepping on this rocker arm 13, the operator can easily rotate the first link 11 around the central pivot 21, and then pull the spring slide bar 3 through the second link 12 to unlock, which is convenient for operation.

[0034] In some embodiments, the top surface of the rocker arm 13 forms a tread surface, and the surface of the tread surface is provided with an anti-slip structure, which is a pressed mesh anti-slip texture or an embedded rubber anti-slip pad, thereby providing a stable and reliable footing interface for the operator. The operator can operate and unlock the linkage mechanism 1 without squatting down.

[0035] In some embodiments, the rod body of the second link 12 is made of a hollow round tube or a hollow square tube. This hollow tubular structure significantly reduces the weight of the second link 12 while ensuring that the second link 12 has sufficient bending and compressive strength.

[0036] In some implementations, such as Figure 1 , Figure 2 , Figure 4 and Figure 6As shown, the locking device of the boarding ladder 7 also includes a limiting mechanism 6 for fixing the linkage mechanism 1 after the boarding ladder 7 is retracted. The limiting mechanism 6 includes a limiting seat 61 fixed to the linkage mechanism 1, a ring seat 63 fixed to the side wall of the walkway 8, and a limiting ring 62 rotatably connected to the ring seat 63. A limiting groove with a shape matching the limiting ring 62 is provided on the limiting seat 61, and the limiting ring 62 can be rotated to engage with the limiting groove. When the boarding ladder 7 is retracted and the locking device is in the locked state, the operator can manually rotate the limiting ring 62 to a specific angle so that it engages in the limiting groove of the limiting seat 61, thereby mechanically constraining the position of the linkage mechanism 1, preventing the linkage mechanism 1 from moving, and thus limiting its pulling on the spring slide rod 3, preventing it from unlocking. This prevents accidental unlocking due to vibration or accidental contact, and solves the safety hazard problem that the boarding ladder 7 may suddenly fall back due to the accidental movement of the linkage mechanism 1 under complex working conditions.

[0037] In some embodiments, the sliding seat 4 includes a cylindrical structure open at both ends and a mounting seat connecting the cylindrical structure. One end of the cylindrical structure is detachably connected to a cover 41 via threads. The center of the cover 41 has a smooth sliding rod hole for precisely guiding the axial movement of the spring sliding rod 3. A return spring 31 is provided inside the cylindrical structure to provide a stable movement track. The mounting seat has several mounting holes to facilitate the secure installation of the entire sliding seat 4 at a predetermined position on the side wall of the walkway 8 using bolts. By providing a cylindrical structure with a detachable cover 41, the assembly and maintenance of the return spring 31 and the sliding rod are facilitated. By providing a mounting seat with multiple mounting holes, the sliding seat 4 achieves a stable and reliable overall structure and flexible installation.

[0038] In summary, this utility model, through the structure of a linkage mechanism 1, a spring slide rod 3, a sliding seat 4, and a locking seat 5, restricts the rotation and descent of the boarding ladder 7 by engaging one end of the spring slide rod 3 with the locking seat 5. This achieves automatic and reliable locking of the boarding ladder 7 in the retracted state, effectively preventing the boarding ladder 7 from suddenly falling due to cylinder 9 failure or air circuit problems. This avoids damage to the boarding ladder 7 or the chassis of the mining excavator, solves the problems of complex structure, inconvenient operation, and reliance on electrical control in existing locking devices, and improves safety and practicality.

[0039] Components and principles not described in detail in this utility model can be implemented using various structures and principles known in the prior art.

[0040] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A boarding bridge locking device, characterized in that include: The system includes a linkage mechanism, a spring slide rod, a sliding seat, and a locking seat. The sliding seat is fixedly connected to the side wall of the platform of the mining excavator. The spring slide rod is slidably connected to the sliding seat. A return spring is provided between the spring slide rod and the sliding seat. The locking seat is located on the side of the boarding ladder near the platform. When the boarding ladder is retracted, one end of the spring slide rod engages with the locking seat to restrict the rotation and descent of the boarding ladder. The other end of the spring slide rod is connected to the linkage mechanism.

2. The boarding ladder locking device of claim 1, wherein The locking seat has a guide surface on the side facing the spring slide rod. When the boarding ladder is retracted, the end of the spring slide rod moves along the guide surface and compresses the return spring. The end of the guide surface has a locking protrusion. When the end of the spring slide rod passes the highest point of the locking protrusion, the spring slide rod forms a limiting engagement with the bottom surface of the locking protrusion under the reset action of the return spring.

3. The boarding ladder locking device of claim 2, wherein, The end of the spring slide rod that is connected to the locking seat is provided with a rotating wheel, which is configured to roll into contact with the guide surface during the retraction of the boarding ladder.

4. The boarding ladder lock of claim 1, wherein, The locking seat has a guide surface on the side facing the spring slide rod. When the boarding ladder is retracted, the end of the spring slide rod moves along the guide surface and compresses the return spring. A pin hole is provided at the highest point of the end of the guide surface, and a positioning pin is provided at the end of the spring slide rod that is connected to the locking seat. When the boarding ladder is retracted, the positioning pin moves along the guide surface and compresses the return spring until it reaches the pin hole position, where it is inserted into the pin hole under the reset action of the return spring.

5. The boarding ladder lock of claim 1, wherein, The linkage mechanism includes a fixed base, a first link, and a second link. The fixed base is fixed to the side wall of the walkway. The middle part of the first link is rotatably connected to the fixed base through a pivot, so that the first link can swing around the pivot. One end of the second link is hinged to the first link, and the other end is hinged to the spring slide rod.

6. The boarding ladder lock of claim 5, wherein, The end of the first link away from the second link is connected to a rocker arm that bends to one side, and the rocker arm is set horizontally.

7. The boarding ladder lock of claim 6, wherein, The top surface of the rocker arm forms a tread, and the surface of the tread is provided with an anti-slip structure, which is a pressed mesh anti-slip texture or an inlaid rubber anti-slip pad.

8. The boarding ladder locking device according to claim 5, characterized in that, The second connecting rod is made of a hollow round tube or a hollow square tube.

9. The boarding ladder locking device according to claim 1, characterized in that, It also includes a limiting mechanism for fixing the linkage mechanism after the boarding ladder is retracted. The limiting mechanism includes a limiting seat fixed to the linkage mechanism, a ring seat fixed to the side wall of the walkway, and a limiting ring rotatably connected to the ring seat. The limiting seat is provided with a limiting groove corresponding to the limiting ring, and the limiting ring can be rotated to engage with the limiting groove.

10. The boarding ladder locking device according to any one of claims 1-9, characterized in that, The sliding seat includes a cylindrical structure open at both ends and a mounting seat connected to the cylindrical structure. One end of the cylindrical structure is detachably connected to a cover by a thread. The center of the cover has a slide rod hole for the spring slide rod to pass through. The return spring is provided inside the cylindrical structure. The mounting seat has a plurality of mounting holes.

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