Locking mechanism of cab door

Abstract

The utility model discloses a locking mechanism of a cab door, which comprises a U-shaped support and a lock column assembly, the U-shaped support is detachably connected with the lock column assembly through an adjusting assembly, and the bottoms of the side walls of the two ends of the U-shaped support are installed on the same plane of a door frame stand column along the horizontal direction. The lock column assembly is connected with the cab door lock buckle in an unlocking mode. The U-shaped support is installed on the same plane by changing the positioning datum plane of the U-shaped support, the positioning precision can be improved, the welding quality can be improved, the position of the lock column assembly can be adjusted through the adjusting assembly according to the position of the door lock buckle, and therefore the positioning precision of the lock column assembly is improved; therefore, high positioning accuracy and high welding quality can enable the cab door to be not prone to stress deformation when being subjected to external force, and reliability and sealing performance and safety of the cab door are improved in a disguised mode. The arc parts are arranged to reduce the risk that the lock column single bodies are prone to deformation and damage when stressed, meanwhile, operators can be prevented from making contact with the lock columns, and safety is improved.

Description

Technical Field

[0001] This utility model relates to a locking mechanism for a driver's cab door, belonging to the technical field of engineering machinery. Background Technology

[0002] Construction machinery operates in harsh environments with complex conditions, making the cab's sealing and safety paramount. The door's locking mechanism directly impacts the cab's sealing and safety, as well as the operator's mood and work efficiency. Therefore, the cab door's locking mechanism has become a crucial indicator of a high-end machine's performance. Consequently, construction machinery manufacturers are rapidly optimizing and upgrading cab structures to maximize sealing, comfort, and safety. Therefore, the door's locking structure must be reliable, providing a good seal to prevent external dust from entering the working environment and protecting the operator's safety.

[0003] Current cab door locks lock the door by pressing the bolt into the latch on the door, and then unlocking the latch by using the handle to separate the bolt from the latch. However, the positioning reference of the bolt body—the lock shell—is on two different planes or curved surfaces. This positioning reference has poor accuracy, and the installation position makes welding space small, difficult to weld, and reduces welding quality. In this case, this method of locking the door by external force is more likely to cause the bolt and lock shell to deform under stress, which in turn leads to a reduction in its reliability, cab door sealing and safety. Summary of the Invention

[0004] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides a locking mechanism for a driver's cab door. This mechanism changes the positioning reference surface of the U-shaped bracket, so that the U-shaped bracket is installed on the same plane, which can improve both positioning accuracy and welding quality. Furthermore, the position of the locking pin assembly can be adjusted by adjusting the adjustment component according to the position of the door lock buckle, thereby improving the positioning accuracy of the locking pin assembly.

[0005] Technical solution: A locking mechanism for a cab door includes a U-shaped bracket and a locking column assembly. The U-shaped bracket and the locking column assembly are detachably connected via an adjustment component. The bottom of the two end side walls of the U-shaped bracket are installed horizontally on the same plane as the door frame column. The locking column assembly is detachably connected to the cab door lock latch.

[0006] This invention improves positioning accuracy by changing the positioning reference plane of the U-shaped bracket and installing it on the same plane. This increases welding space, reduces welding difficulty, and improves welding quality. Furthermore, the position of the lock cylinder assembly can be adjusted according to the position of the door lock buckle to improve the positioning accuracy of the lock cylinder assembly. Therefore, the high positioning accuracy and high welding quality make it less prone to deformation under external force, thereby indirectly improving reliability, cab door sealing, and safety.

[0007] Preferably, to ensure the locking pin assembly can lock with the door lock latch after the U-shaped bracket is installed, the height of the front end of the U-shaped bracket sidewall from top to bottom is less than the height of the rear end from top to bottom in the projection plane perpendicular to the sidewall of the U-shaped bracket. The top surface of the U-shaped bracket is parallel to the contact surface where the cab door and the door frame pillar fit together after the cab door is closed. Setting the ends of both sides of the U-shaped bracket inclined not only helps the locking pin assembly to lock properly with the door lock latch, but also facilitates welding at the inclined ends, improving welding quality.

[0008] In a preferred embodiment, to facilitate adjustment of the locking pin's position, the locking pin assembly includes a mounting part and a locking pin. The mounting part is detachably connected to the U-shaped bracket via an adjustment component, and the locking pin is fixedly connected to the mounting part.

[0009] Since the locking pin was originally welded to the U-shaped bracket, adjusting the position of the locking pin required repeated disassembly and re-welding, which damaged the rigidity and aesthetics of the U-shaped bracket. Therefore, an installation part was set up to facilitate the adjustment of the locking pin's position.

[0010] In a preferred embodiment, in order to adjust the positioning accuracy of the locking pin, the adjusting component includes an adjusting hole through the top surface of the U-shaped bracket, and the mounting part is provided with a mounting hole. The U-shaped bracket and the mounting part are connected by bolts and nuts to connect the adjusting hole and the mounting hole.

[0011] The position of the lock pin can be adjusted by adjusting the hole, so that the position of the lock pin can be adjusted up, down, left and right according to the position of the door lock buckle. This not only improves the matching degree between the two, but also indirectly avoids the deformation caused by low positioning accuracy. The adjustment hole in this embodiment can be an elliptical hole or an oblong hole.

[0012] In a preferred embodiment, in order to protect the locking pin, the side end face of the mounting part is provided with an inwardly curved arc portion, the vertical distance from the vertex of the arc portion to the mounting part is less than or equal to the height of the locking pin, and a gap is provided between the top of the arc portion and the locking pin.

[0013] The arc-shaped portion acts as a reinforcing rib. When the locking pin is slightly deformed by external force, it will contact the arc-shaped portion, distributing the force to the arc-shaped portion and reducing the risk of the locking pin easily deforming and being damaged under stress. At the same time, the arc-shaped portion can prevent the operator from coming into contact with the locking pin, improving safety. In this embodiment, the gap corresponds to the locking pin deformation amount, which is 0.5-1.5mm, while also meeting the requirements of the manufacturing process accuracy.

[0014] In a preferred embodiment, to improve the rigidity of the locking column, after the cab door is closed, the cab door lock latch engages in the middle of the locking column, and the diameter of the locking column is greater than the minimum opening of the door lock latch engagement and less than the maximum opening of the door lock latch engagement.

[0015] Compared to existing locking cylinders, this design shortens the cylinder length and increases its diameter. This not only increases the cylinder's rigidity to prevent deformation under stress, but also avoids safety hazards caused by operators coming into contact with or colliding with the cylinder when entering or leaving the building.

[0016] In a preferred embodiment, to improve the reliability of the connection between the U-shaped bracket and the locking column assembly, the U-shaped bracket and the locking column assembly are connected by bolts and nuts, and the nuts are welded to the inner side of the top surface of the U-shaped bracket.

[0017] Welding the nut before connecting it to the bolt ensures the strength and stability of the connection between the two, reducing the impact of external forces caused by closing the cab door or vibration.

[0018] In a preferred embodiment, to facilitate welding of the nut, the inner side of the U-shaped bracket is provided with a guide hole that communicates with the adjustment hole, and the nut is provided with a guide boss that matches the guide hole. The guide hole and guide boss reduce manufacturing time and facilitate production.

[0019] Beneficial effects: This utility model improves positioning accuracy and welding quality by changing the positioning reference plane of the U-shaped bracket and installing it on the same plane. Furthermore, the position of the lock cylinder assembly can be adjusted according to the position of the door lock latch, further enhancing its positioning accuracy. Therefore, high positioning accuracy and high welding quality make it less prone to deformation under external forces, indirectly improving reliability, cab door sealing, and safety. The rounded portion reduces the risk of deformation and damage to the individual lock cylinder under stress and also prevents operators from contacting the lock cylinder, thus improving safety. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a door lock locking mechanism in the prior art of this utility model;

[0022] Figure 2 This is a schematic diagram of the lock pin structure in the prior art of this utility model;

[0023] Figure 3 This is an isometric view of the locking mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the installation of the U-shaped bracket and nut of this utility model;

[0025] Figure 5 This is a schematic diagram of the locking post assembly of this utility model;

[0026] Figure 6 This is the front view of the locking mechanism of this utility model. Detailed Implementation

[0027] 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.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] like Figure 1 and Figure 2 The diagram shows a prior art lock housing with its positioning reference on two different planes or curved surfaces. This positioning reference has poor accuracy, and the installation location results in limited welding space, making welding difficult and reducing weld quality. Furthermore, this method of locking the door by external force makes the bolt and lock housing more prone to deformation, leading to reduced reliability, cab door sealing, and security. Therefore, improvements are needed to address these issues.

[0031] like Figure 3 As shown, a locking mechanism for a cab door includes a U-shaped bracket 1 and a locking column assembly 2. The U-shaped bracket 1 and the locking column assembly 2 are detachably connected by an adjusting component 3. The bottom of the two side walls of the U-shaped bracket 1 are installed horizontally on the same plane of the door frame column 4. The locking column assembly 2 is detachably connected to the cab door lock latch.

[0032] By changing the positioning reference plane of the U-shaped bracket 1 and installing the U-shaped bracket 1 on the same plane, the positioning accuracy can be improved, the welding space can be increased, the welding difficulty can be reduced, and the welding quality can be improved. Furthermore, the position of the lock pillar assembly 2 can be adjusted by adjusting the component 3 according to the position of the door lock buckle, so as to improve the positioning accuracy of the lock pillar assembly 2. Therefore, the high positioning accuracy and high welding quality make it less prone to deformation under external force, thereby indirectly improving reliability, cab door sealing and safety.

[0033] like Figure 4 As shown, in order to ensure that after the U-shaped bracket 1 is installed, the height of the front end of the side wall of the U-shaped bracket 1 from top to bottom is less than the height of the rear end from top to bottom in the projection plane perpendicular to the side wall of the U-shaped bracket 1, the top surface of the U-shaped bracket 1 is parallel to the contact surface where the cab door and the door frame column 4 fit together after the cab door is closed.

[0034] The locking pin assembly 2 can lock with the door lock latch. Setting the ends of the two side walls of the U-shaped bracket 1 in an inclined shape not only helps the locking pin assembly 2 to lock with the door lock latch normally, but also makes the inclined side wall ends easier to weld, thus improving the welding quality.

[0035] like Figure 3 As shown, in order to facilitate the adjustment of the position of the locking pin 22, the locking pin assembly 2 includes a mounting part 21 and a locking pin 22. The mounting part 21 is detachably connected to the U-shaped bracket 1 through an adjustment component 3, and the locking pin 22 is fixedly connected to the mounting part 21.

[0036] Since the locking pin 22 was originally welded to the U-shaped bracket 1, if the position of the locking pin 22 needs to be adjusted, it needs to be repeatedly disassembled and re-welded, which would damage the rigidity and aesthetics of the U-shaped bracket 1. Therefore, the mounting part 21 is provided to facilitate the adjustment of the position of the locking pin 22.

[0037] like Figure 4 and Figure 5 As shown, in order to adjust the positioning accuracy of the locking pin 22, the adjustment component 3 includes an adjustment hole 31 through the top surface of the U-shaped bracket 1, and an installation hole 211 is provided on the mounting part 21. The U-shaped bracket 1 and the mounting part 21 are connected by bolts and nuts 5 to achieve connection between the adjustment hole 31 and the installation hole 211.

[0038] The position of the locking pin 22 can be adjusted by adjusting the hole 31, so that the position of the locking pin 22 can be adjusted up, down, left and right according to the position of the door lock buckle. This not only improves the matching degree between the two, but also indirectly avoids the deformation caused by low positioning accuracy. In this embodiment, the adjusting hole 31 can be an elliptical hole or an oblong hole.

[0039] In order to protect the locking pin 22, the side end face of the mounting part 21 is provided with an inwardly curved arc part 212. The vertical distance from the vertex of the arc part 212 to the mounting part 21 is less than or equal to the height of the locking pin 22, and there is a gap between the top of the arc part 212 and the locking pin 22.

[0040] The arc-shaped portion 212 acts as a reinforcing rib. When the locking pin 22 is slightly deformed by external force, it will come into contact with the arc-shaped portion 212, thus distributing the external force onto the arc-shaped portion 212. This reduces the risk of the locking pin 22 easily deforming and being damaged under stress. At the same time, the arc-shaped portion 212 can prevent operators from coming into contact with the locking pin 22, improving safety. In this embodiment, the gap corresponds to the deformation of the locking pin 22, which is 0.5-1.5mm, while also meeting the requirements of processing accuracy.

[0041] To improve the rigidity of the locking pin 22, after the cab door is closed, the cab door lock latch engages in the middle of the locking pin 22. The diameter of the locking pin 22 is greater than the minimum opening of the door lock latch engagement and less than the maximum opening of the door lock latch engagement.

[0042] Compared to the existing locking pin 22, the length of the locking pin 22 has been shortened and the diameter of the locking pin 22 has been increased. This not only increases the rigidity of the locking pin 22 to prevent it from deforming under stress, but also avoids the safety hazards caused by the operator coming into contact with the locking pin 22 when entering or leaving the door after shortening the length.

[0043] like Figure 6 As shown, in order to improve the reliability of the connection between the U-shaped bracket 1 and the locking column assembly 2, the U-shaped bracket 1 and the locking column assembly 2 are connected by bolts and nuts 5, and the nuts 5 are welded to the inner side of the top surface of the U-shaped bracket 1.

[0044] Welding nut 5 before connecting it to bolts ensures the strength and stability of the connection between the two, reducing the impact of external forces caused by the closing of the cab door or vibration.

[0045] like Figure 4 As shown, to facilitate welding of the nut 5, the inner side of the U-shaped bracket 1 is provided with a guide hole 11 that communicates with the adjustment hole, and the nut 5 is provided with a guide boss 51 that matches the guide hole 11. The guide hole 11 and guide boss 51 reduce preparation time and facilitate manufacturing.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A locking mechanism for a driver's cab door, characterized in that: Includes a U-shaped bracket (1) and a locking column assembly (2). The U-shaped bracket (1) and the locking column assembly (2) are detachably connected by an adjustment assembly (3). The bottom of the two side walls of the U-shaped bracket (1) are installed horizontally on the same plane of the door frame column (4). The locking column assembly (2) is detachably connected to the cab door lock buckle.

2. The locking mechanism for the driver's cab door according to claim 1, characterized in that: In the projection plane perpendicular to the side wall of the U-shaped bracket (1), the height of the front end of the side wall of the U-shaped bracket (1) from the top to the bottom is less than the height of the rear end from the top to the bottom. The top surface of the U-shaped bracket (1) is parallel to the contact surface where the cab door and the door frame column (4) fit together after the cab door is closed.

3. The locking mechanism for the driver's cab door according to claim 1, characterized in that: The locking post assembly (2) includes a mounting part (21) and a locking post (22). The mounting part (21) is detachably connected to the U-shaped bracket (1) via an adjustment assembly (3). The locking post (22) is fixedly connected to the mounting part (21).

4. The locking mechanism for the driver's cab door according to claim 3, characterized in that: The adjustment component (3) includes an adjustment hole (31) through the top surface of the U-shaped bracket (1), and an installation hole (211) on the mounting part (21). The U-shaped bracket (1) and the mounting part (21) are connected by bolts and nuts (5) to the adjustment hole (31) and the installation hole (211).

5. The locking mechanism for the driver's cab door according to claim 3, characterized in that: The side end face of the mounting part (21) is provided with an inwardly curved arc part (212). The vertical distance from the vertex of the arc part (212) to the mounting part (21) is less than or equal to the height of the locking post (22), and there is a gap between the top of the arc part (212) and the locking post (22).

6. The locking mechanism for the driver's cab door according to claim 3, characterized in that: After the cab door is closed, the cab door lock latch engages in the middle of the lock column (22). The diameter of the lock column (22) is greater than the minimum opening of the door lock latch engagement and less than the maximum opening of the door lock latch engagement.

7. The locking mechanism for the driver's cab door according to claim 1, characterized in that: The U-shaped bracket (1) and the locking column assembly (2) are connected by bolts and nuts (5), and the nuts (5) are welded to the inner side of the top surface of the U-shaped bracket (1).

8. The locking mechanism for the driver's cab door according to claim 7, characterized in that: The inner side of the U-shaped bracket (1) is provided with a guide hole (11) that communicates with the adjustment hole (31), and the nut (5) is provided with a guide boss (51) that matches the guide hole (11).

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