Door strike with seal for construction machine cab

Abstract

The utility model relates to a door latch with sealing device for engineering machinery cab belongs to engineering machinery cab technical field, it includes handle, latch seal cover, latch body, latch seal ware and lock catch assembly, handle is located on the latch body, the latch seal cover is tightly wrapped in the latch body outside and both common with the latch mounting plate inside the cab link, the latch seal ware is located on the latch mounting plate outside the cab, the lock catch assembly is located outside the cab and works together with the latch seal ware and latch body and realizes the opening and closing function of door. The utility model has the advantages of simple structure and reliability, is favorable to solve the problem that the indoor and outdoor communication is caused because of latch structure, brings comfortable working environment for cab member.

Description

Technical Field

[0001] This utility model relates to a door latch with a sealing device for the cab of construction machinery, and belongs to the technical field of construction machinery cabs. Background Technology

[0002] In the field of construction machinery, the cab door stop lock is one of the key components ensuring the comfort and stability of the cab's interior environment. Traditional construction machinery cab door stop locks primarily function to limit the opening of the cab door. Their working principle relies on the latch in the lock body mounted on the cab door engaging with the latch assembly welded to the cab, thus closing the door. However, the existing stop lock design has significant shortcomings. When the latch extends into the cab, a connection is formed between the inside and outside of the cab. Currently, the industry commonly uses an open rubber plate mounted on the door lock body mounting surface to achieve sealing. However, this sealing method has a short service life; after the latch and latch engage for a period of time, the rubber plate is prone to damage. Once the rubber plate is damaged, the sealing function fails, allowing dust, smoke, and other harmful substances to enter the cab. This not only affects the air quality inside the cab but also negatively impacts the air conditioning's performance, significantly reducing the driver's operating experience and failing to meet the high sealing performance requirements of modern construction machinery cabs. Utility Model Content

[0003] The purpose of this utility model is to provide a door latch with a sealing device for the cab of engineering machinery. The sealing device has a simple and reliable structure, effectively solving the problem of indoor and outdoor connection caused by the latch structure, and providing a comfortable working environment for the driver.

[0004] To achieve the above objectives, the present invention provides a door latch with a sealing device for the cab of engineering machinery, comprising a handle, a latch sealing sleeve, a latch body, a latch seal, and a latch assembly. The handle is disposed on the latch body, the latch sealing sleeve tightly wraps around the outside of the latch body and both are connected to the latch mounting plate inside the cab, the latch seal is disposed on the latch mounting plate outside the cab, and the latch assembly is disposed outside the cab and works in conjunction with the latch seal and the latch body to realize the door opening and closing function.

[0005] Preferably, the latching seal includes a seal housing, a locking block, a limiting block, a slider, an end cap, and a spring. The locking block, the limiting block, and the spring are located inside the seal housing. The spring is located between the slider and the limiting block to provide elastic support for the slider. The limiting block can prevent the spring from shifting or tilting when the slider slides. The outer surface of the seal housing is provided with an oblong hole.

[0006] Preferably, the 150° inclined surface of the slider is positioned at the waist-shaped hole of the sealer housing under the action of the spring force.

[0007] Preferably, the slider has three blind holes with a diameter of 5.5 mm and a depth of 10 mm, which precisely match the three through holes of the same diameter on the limiting block.

[0008] Preferably, the surface of the slider is galvanized.

[0009] Preferably, the active area of ​​the slider is pre-applied with lubricating grease to reduce the coefficient of friction, ensure smooth operation, and extend the service life of the component.

[0010] Preferably, the sealer housing is manufactured using a compression molding process with a thickness of 1.5 mm.

[0011] Preferably, the end cap is provided with a tapered mounting hole so that after the flat-head screw is fixed, its surface is lower than the mounting surface of the sealer housing, thereby forming a flat appearance and further enhancing the sealing effect.

[0012] Preferably, the latch sealing sleeve is made of nitrile rubber with a wall thickness of 1.5 mm. Its shape is precisely matched to the contour of the latch body and the latch assembly when they are engaged. Furthermore, a flange structure is designed at the assembly point with the latch body to enhance the sealing performance between the latch and the latch mounting plate after assembly.

[0013] Preferably, the handle is made of nylon with a textured surface design to improve ease of operation and ensure durability.

[0014] In summary, this utility model has the following beneficial technical effects:

[0015] Compared to traditional engineering machinery door stop locks that use an open rubber plate mounted on the mounting surface of the stop lock body for sealing, which is prone to damage due to the rubber plate being located between the latch and the latch, this utility model provides a door stop lock with a sealing device for the engineering machinery cab. The sealing device consists of two parts: a stop lock sealing sleeve and a stop lock sealer. The stop lock sealing sleeve wraps around the stop lock body, making it less prone to damage. The stop lock sealer is mounted on the outer side of the stop lock mounting plate. In actual operation, before the latch and the latch engage, the latch first contacts the inclined surface of the slider in the stop lock sealer. The inclined surface of the slider is subjected to a horizontal force, causing the slider to slide upwards, creating space for the latch to move, and then the latch and the latch engage. When the stop lock is not in operation, the slider in the stop lock sealer is in a closed state under the action of the spring force, ensuring the sealing performance of the cab stop lock. This door stop lock with a sealing device has a simple and reliable structure, solving the technical problem of door stop lock sealing through the double-layer protection of the stop lock sealing sleeve and the stop lock sealer. Attached Figure Description

[0016] Figure 1Exploded view of the door latch with sealing device for the cab of engineering machinery provided by this utility model;

[0017] Figure 2 Assembly drawing of a door latch with sealing device for a cab of engineering machinery provided by this utility model;

[0018] Figure 3 for Figure 1 Exploded view of the center-lock seal;

[0019] Figure 4 for Figure 2 Images of the center bumper lock body, handle, and bumper lock protective kit;

[0020] Figure 5 for Figure 2 3D view of the center-mounted locking protective sleeve.

[0021] Reference numerals: 1. Handle; 2. Plunger sealing sleeve; 3. Plunger body; 4. Plunger seal; 5. Locking assembly; 41. Seal housing; 42. Lock block; 43. Limiting block; 44. Spring; 45. Slider; 46. End cap. Detailed Implementation

[0022] 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.

[0023] This utility model discloses a door lock with a sealing device for the cab of engineering machinery. It achieves high sealing performance when the cab door is locked through a double-layer sealing structure, effectively isolating external dust and noise, and creating a comfortable working environment for the driver.

[0024] The door latch structure mainly includes a handle 1, a latch sealing sleeve 2, a latch body 3, a latch seal 4, and a latch assembly 5. The handle 1 is made of nylon and is fixed to the latch body 3 with screws. Its textured surface design improves ease of operation and ensures durability. The latch sealing sleeve 2 tightly wraps around the latch body 3, and both are connected to the latch mounting plate inside the driver's cab by bolts. The latch sealing sleeve 2 is made of 1.5 mm thick nitrile rubber, and its shape precisely matches the contour of the latch body 3 when it engages with the latch assembly 5, ensuring the integrity of the seal when the door is locked. In particular, the latch sealing sleeve 2 has a flanged structure at the assembly point with the latch body 3. This detail significantly enhances the sealing performance between the sleeve and the latch mounting plate after assembly, effectively preventing dust from entering the driver's cab along the gaps.

[0025] The latch seal 4, as a key outer sealing component of this structure, is fixedly installed on the latch mounting plate outside the driver's cab. Its internal structure includes a seal housing 41, a locking block 42, a limiting block 43, a slider 45, an end cap 46, and three YA 0.5×5×20 springs 44. The seal housing 41 is manufactured using a 1.5 mm thick pressing process, ensuring a high degree of flatness on the mounting surface. It also features a waist-shaped hole on the front to accommodate the movement trajectory of the slider 45. The locking block 42 and the limiting block 43 are fixed to the seal housing 41 by welding, forming a stable support structure. The slider 45 has three blind holes with a diameter of 5.5 mm and a depth of 10 mm, precisely matching the three through holes of the same diameter on the limiting block 43. The springs 44 are installed between the slider 45 and the limiting block 43, providing stable elastic support for the slider 45. The limiting block 43 prevents the springs 44 from shifting or tilting when the slider 45 slides. The slider 45 is galvanized, which enhances its wear resistance and corrosion resistance. Its 150° angle, under the elastic force of spring 44, positions it at the oblong hole of the sealer housing 41. The end cap 46, with its tapered mounting hole design, ensures that its surface is lower than the mounting surface of the sealer housing 41 after the flat-head screw is fixed, thus creating a smooth appearance and further enhancing the sealing effect.

[0026] The latch assembly 5 is fixed to the external frame of the cab and works in conjunction with the bumper seal 4 and the bumper body 3 to realize the door opening and closing function. When the cab door is opened, the door hinge drives the bumper body 3 to rotate with the bumper mounting plate, and the latch tongue of the latch assembly 5 first contacts the inclined surface of the slider 45 in the bumper seal 4. The horizontal force applied by the latch tongue to the inclined surface of the slider 45 causes the slider 45 to slide upward along the oblong hole of the seal housing 41, thereby making room for the latch movement and allowing the latch and latch tongue to engage smoothly. At this time, the lubricating grease pre-applied to the moving area of ​​the slider 45 effectively reduces the coefficient of friction, ensuring smooth operation and extending the service life of the components.

[0027] When the cab door is closed, the latch separates from the bolt, and the slider 45 in the latch seal 4 automatically resets downwards under the elastic force of the spring 44, returning to the closed state. This action not only seals the movement channel of the latch assembly 5, but also forms a double-layer sealing protection together with the latch seal sleeve 2. The inner latch seal sleeve 2, through its flanged structure and tightly wrapped latch body 3, prevents dust from entering from internal gaps; the outer latch seal 4, through the reset action of the slider 45 and the sealing design of the end cap 46, effectively isolates the influence of the external environment on the interior of the cab. The synergistic effect of the double-layer protection mechanism significantly improves the sealing performance of the cab door latch, providing reliable protection for the driver in both harsh construction environments and daily operations, ensuring a clean and comfortable working environment.

[0028] The door latch with sealing device for engineering machinery cabs disclosed in this utility model achieves a highly efficient sealing function when the cab door is locked through a carefully designed double-layer sealing structure and precise cooperation between various components. Its structural design and material application not only improve the durability and reliability of the device, but also provide a new solution for sealing technology in engineering machinery cabs, possessing significant practical value and promising prospects for widespread application.

[0029] 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 door latch with a sealing device for the cab of construction machinery, characterized in that, The device includes a handle (1), a latch sealing sleeve (2), a latch body (3), a latch seal (4), and a latch assembly (5). The handle (1) is located on the latch body (3). The latch sealing sleeve (2) tightly wraps around the outside of the latch body (3), and both are connected to the latch mounting plate inside the cab. The latch seal (4) is located on the latch mounting plate outside the cab. The latch assembly (5) is located outside the cab and works in conjunction with the latch seal (4) and the latch body (3) to realize the opening and closing function of the door.

2. The door latch with sealing device for the cab of engineering machinery according to claim 1, characterized in that, The latch seal (4) includes a seal housing (41), a locking block (42), a limiting block (43), a slider (45), an end cap (46), and a spring (44). The locking block (42), the limiting block (43), and the spring (44) are located inside the seal housing (41). The spring (44) is located between the slider (45) and the limiting block (43) to provide elastic support for the slider (45). The limiting block (43) can prevent the spring (44) from shifting or tilting when the slider (45) slides. The outer surface of the seal housing (41) is provided with a waist-shaped hole.

3. The door latch with sealing device for the cab of engineering machinery according to claim 2, characterized in that, The 150° inclined surface of the slider (45) is positioned at the waist-shaped hole of the sealer housing (41) under the elastic force of the spring (44).

4. The door latch with sealing device for the cab of engineering machinery according to claim 3, characterized in that, The slider (45) has three blind holes with a diameter of 5.5 mm and a depth of 10 mm, which precisely match the three through holes of the same diameter on the limiting block (43).

5. The door latch with sealing device for the cab of engineering machinery according to claim 4, characterized in that, The surface of the slider (45) is galvanized.

6. The door latch with sealing device for the cab of engineering machinery according to claim 4, characterized in that, The active area of ​​the slider (45) is pre-lubricated with grease to reduce the coefficient of friction, ensure smooth operation, and extend the service life of the component.

7. The door latch with sealing device for the cab of engineering machinery according to claim 4, characterized in that, The sealer housing (41) is manufactured using a compression molding process with a thickness of 1.5 mm.

8. The door latch with sealing device for the cab of engineering machinery according to claim 4, characterized in that, The end cap (46) is provided with a tapered mounting hole so that after the flat-head screw is fixed, its surface is lower than the mounting surface of the sealer housing (41), thereby forming a flat appearance and further enhancing the sealing effect.

9. The door latch with sealing device for the cab of engineering machinery according to any one of claims 1-8, characterized in that, The latch sealing sleeve (2) is made of nitrile rubber with a wall thickness of 1.5 mm. Its shape is precisely matched with the contour of the latch body (3) and the latch assembly (5) when they are engaged. It also has a flange structure at the assembly point with the latch body (3) to enhance the sealing performance between the latch and the latch mounting plate after assembly.

10. The door latch with sealing device for the cab of engineering machinery according to any one of claims 1-8, characterized in that, The handle (1) is made of nylon and has a textured surface to improve ease of operation and ensure durability.

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