Protective mechanism of cab door

Abstract

The utility model discloses a protective mechanism of a cab door, which comprises a first mounting frame, a second mounting frame and a drawstring, two ends of the drawstring are respectively detachably connected with the first mounting frame and the second mounting frame, the first mounting frame is hinged with a telescopic end of a gas spring, and the maximum extension length of the drawstring is smaller than that of the gas spring. Through a three-point stress protection system formed by the first mounting frame, the second mounting frame and the telescopic end of the gas spring, the maximum extension length of the drawstring is determined according to the effective stroke of the gas spring, namely the maximum extension length of the gas spring, so that the opening angle of the cab door is limited within the effective stroke of the gas spring, and when the cab door is opened, the maximum extension length of the drawstring is determined. The gas spring is effectively prevented from losing efficacy due to overload, and the safety protection hidden danger caused by damage of the gas spring is avoided while the buffering effect during opening and closing of the cab door is guaranteed; meanwhile, a third pin shaft is arranged to provide tensile force, a rubber sleeve is arranged to improve the reliability of the drawstring, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to a protective 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 door susceptible to damage from external forces. Therefore, the cab door's protective mechanism is crucial, directly impacting the operator's mood and work efficiency. Consequently, the cab door's protective mechanism has become a key indicator of a high-end machine's performance. Construction machinery manufacturers are therefore rapidly optimizing and upgrading the cab door's protective mechanism to maximize its protective capabilities. Thus, the cab door's protective mechanism must be reliable and provide effective protection against external forces.

[0003] In existing technologies, a single gas spring is typically used to connect the cab door panel and the vehicle body. The opening angle of the door is controlled by the extension and retraction stroke of the gas spring, and the tension of the gas spring provides a protective effect. However, this cannot form a systematic protection. The cab door panel is heavy, resulting in a large inertia. When the door is opened or when the door panel is affected by wind, the gas spring is subjected to a tension exceeding its effective stroke, causing it to fail. The force is concentrated at the connection end between the gas spring and the door panel, resulting in single-point force. At the same time, the gas spring itself is rigid, and vibrations during machine operation can cause the gas spring to fail, resulting in the lack of a limit function for the cab door. This leads to the risk of damage due to lack of protection, and in severe cases, it can affect the operational safety of the operator. Summary of the Invention

[0004] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides a protective mechanism for a driver's cab door. This mechanism avoids gas spring failure by forming a three-point force protection system through a first mounting bracket, a second mounting bracket, and the telescopic end of the gas spring.

[0005] Technical solution: A protective mechanism for a driver's cab door includes a first mounting bracket, a second mounting bracket, and a pull strap. The two ends of the pull strap are detachably connected to the first mounting bracket and the second mounting bracket, respectively. The first mounting bracket is hinged to the telescopic end of a gas spring. The maximum extension length of the pull strap is less than the maximum extension length of the gas spring.

[0006] This invention determines the maximum extension length of the pull belt based on the effective stroke of the gas spring, i.e., the maximum extension length of the gas spring, thereby limiting the opening angle of the cab door within the effective stroke of the gas spring. When the cab door is opened, it effectively protects the gas spring from failure due to overload, ensuring the buffering effect when the cab door is opened and closing, while avoiding safety hazards caused by gas spring damage.

[0007] In a preferred embodiment, to reduce the impact of tilting force caused by the misalignment of the stretching direction and the rotation direction on the life of the belt, the stretching direction of the belt is perpendicular to the rotation axis of the cab door.

[0008] Preferably, to prevent wear caused by excessive friction between the pull strap and the first and second mounting brackets, the width of the pull strap is less than the vertical distance from the upper end face to the lower end face of the second mounting bracket, and less than the vertical distance from the upper end face to the lower end face of the first mounting bracket.

[0009] In a preferred embodiment, to facilitate the installation and disassembly of the pull strap and improve the convenience of after-sales maintenance, a first pin and a second pin are respectively installed on the first mounting bracket and the second mounting bracket. The two ends of the first pin are detachably connected to the upper and lower end faces of the first mounting bracket, respectively, and the two ends of the second pin are detachably connected to the upper and lower end faces of the second mounting bracket, respectively. The two ends of the pull strap are respectively sleeved on the first pin and the second pin.

[0010] In a preferred embodiment, in order to provide tension to the pull belt and extend its service life, a third pin is also included, which is mounted on the second mounting bracket. The third pin is disposed on one side of the second pin in a direction close to the first pin, and the pull belt slides in contact with the outer circumferential surface of the third pin when stretched.

[0011] In a preferred embodiment, to reduce friction between the pull belt and the third pin, a rubber sleeve is further included on the third pin, wherein the pull belt slides in contact with the outer circumferential surface of the rubber sleeve when stretched.

[0012] The elastic deformation characteristics of the rubber sleeve provide cushioning and anti-slip properties for the pull belt, improving its reliability and extending its service life.

[0013] In a preferred embodiment, in order to facilitate the installation of the rubber sleeve and reduce the friction between the rubber sleeve and the second mounting bracket when the rubber sleeve rotates, thereby extending the service life of the rubber sleeve, the height of the rubber sleeve is less than the vertical distance from the upper end face to the lower end face of the second mounting bracket.

[0014] In a preferred embodiment, in order to limit the installation of the first pin, the second pin, and the third pin and facilitate their installation and disassembly, a retaining spring is provided at the end of the first pin near the lower end face of the first mounting bracket, and the same retaining spring is provided at the end of the second pin and the third pin near the lower end face of the second mounting bracket.

[0015] Beneficial effects: This utility model uses a three-point force protection system formed by the first mounting bracket, the second mounting bracket, and the telescopic end of the gas spring. By determining the maximum extension length of the pull belt based on the effective stroke of the gas spring, i.e., the maximum extension length of the gas spring, the opening angle of the cab door is limited within the effective stroke of the gas spring. When the cab door is opened, it effectively protects the gas spring from failure due to overload. While ensuring the buffering effect when the cab door is opened and closed, it avoids the safety hazards caused by gas spring damage. At the same time, a third pin is set to provide tension force, and a rubber sleeve is set to improve the reliability of the pull belt and extend its service life. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is an overall assembly structure diagram of the protective mechanism of this utility model;

[0018] Figure 2 This is an installation structure diagram of the protective mechanism of this utility model;

[0019] Figure 3 This is an enlarged view of the protective mechanism of this utility model;

[0020] Figure 4 This is a structural diagram of the second mounting bracket of this utility model;

[0021] Figure 5 This is a structural diagram of the first mounting bracket of this utility model. 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] 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.

[0024] 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.

[0025] like Figures 1-5 As shown, a protective mechanism for a driver's cab door includes a first mounting bracket 1, a second mounting bracket 2, and a pull strap 3. The two ends of the pull strap 3 are detachably connected to the first mounting bracket 1 and the second mounting bracket 2, respectively. The second mounting bracket 2 is hinged to the telescopic end of a gas spring 4. The maximum extension length of the pull strap 3 is less than the maximum extension length of the gas spring 4.

[0026] The maximum extension length of the pull strap 3 is determined based on the effective stroke of the gas spring 4, i.e., its maximum extension length. This limits the opening angle of the cab door to within the effective stroke of the gas spring 4, effectively protecting the gas spring 4 from overload failure when the cab door is opened. While ensuring a buffering effect during cab door opening and closing, it also avoids safety hazards caused by damage to the gas spring 4. In this embodiment, when designing the maximum extension length of the pull strap 3, the compression of the gas spring 4 should be between 10mm and 15mm, and the horizontal opening of the cab door should be greater than 850mm. The pull strap 3 is made of a fiber material with elasticity and toughness.

[0027] In order to reduce the impact of tilting force caused by the misalignment of the stretching direction and the rotation direction on the life of the pull belt 3, the stretching direction of the pull belt 3 is perpendicular to the rotation axis of the cab door.

[0028] To prevent wear caused by excessive friction between the pull strap 3 and the first mounting bracket 1 and the second mounting bracket 2, the width of the pull strap 3 is less than the vertical distance from the upper end face to the lower end face of the second mounting bracket 2, and less than the vertical distance from the upper end face to the lower end face of the first mounting bracket 1.

[0029] To facilitate the installation and disassembly of the pull strap 3 and improve the convenience of after-sales maintenance, a first pin 11 and a second pin 12 are respectively installed on the first mounting frame 1 and the second mounting frame 2. The two ends of the first pin 11 are detachably connected to the upper and lower end faces of the first mounting frame 1, respectively. The two ends of the second pin 12 are detachably connected to the upper and lower end faces of the second mounting frame 2, respectively. The two ends of the pull strap 3 are respectively sleeved on the first pin 11 and the second pin 12.

[0030] In order to provide tension to the pull belt 3 and extend the service life of the pull belt 3, a third pin 5 is also included, which is mounted on the second mounting bracket 2. The third pin 5 is arranged on one side of the second pin 12 in a direction close to the first pin 11. The pull belt 3 slides in contact with the outer circumferential surface of the third pin 5 when stretched.

[0031] To reduce friction between the pull belt 3 and the third pin 5, a rubber sleeve 6 is also included, which is fitted onto the third pin 5. The pull belt 3 slides in contact with the outer circumferential surface of the rubber sleeve 6 when stretched.

[0032] The elastic deformation characteristics of the rubber sleeve 6 provide cushioning and anti-slip properties for the pull belt 3, thereby improving the reliability of the pull belt 3 and extending its service life.

[0033] In order to facilitate the installation of the rubber sleeve 6 and reduce the friction between the rubber sleeve 6 and the second mounting bracket 2 when the rubber sleeve 6 rotates, and to extend the service life of the rubber sleeve 6, the height of the rubber sleeve 6 is less than the vertical distance from the upper end face to the lower end face of the second mounting bracket 2.

[0034] In order to limit the installation of the first pin 11, the second pin 12, and the third pin 5 and facilitate their installation and disassembly, a retaining spring 7 is provided at one end of the first pin 11 near the lower end face of the first mounting bracket 1, and the same retaining spring 7 is provided at one end of the second pin 12 and the third pin 5 near the lower end face of the second mounting bracket 2.

[0035] 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.

[0036] 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 protective mechanism for a driver's cab door, characterized in that: It includes a first mounting bracket (1), a second mounting bracket (2), and a pull strap (3). The two ends of the pull strap (3) are detachably connected to the first mounting bracket (1) and the second mounting bracket (2), respectively. The first mounting bracket (1) is hinged to the telescopic end of the gas spring (4). The maximum extension length of the pull strap (3) is less than the maximum extension length of the gas spring (4).

2. The protective mechanism for the driver's cab door according to claim 1, characterized in that: The stretching direction of the pull strap (3) is perpendicular to the rotation axis of the cab door.

3. The protective mechanism for the driver's cab door according to claim 2, characterized in that: The width of the pull strap (3) is less than the vertical distance from the upper end face of the second mounting bracket (2) to its lower end face, and less than the vertical distance from the upper end face of the first mounting bracket (1) to its lower end face.

4. The protective mechanism for the driver's cab door according to claim 1, characterized in that: The first mounting bracket (1) and the second mounting bracket (2) are respectively equipped with a first pin (11) and a second pin (12). The two ends of the first pin (11) are detachably connected to the upper end face and the lower end face of the first mounting bracket (1), respectively. The two ends of the second pin (12) are detachably connected to the upper end face and the lower end face of the second mounting bracket (2), respectively. The two ends of the pull strap (3) are respectively sleeved on the first pin (11) and the second pin (12).

5. The protective mechanism for the driver's cab door according to claim 4, characterized in that: It also includes a third pin (5) mounted on the second mounting bracket (2), the third pin (5) being disposed on one side of the second pin (12) in a direction close to the first pin (11), and the pull strap (3) slidingly contacting the outer circumferential surface of the third pin (5) when stretched.

6. The protective mechanism for the driver's cab door according to claim 5, characterized in that: It also includes a rubber sleeve (6) fitted on the third pin (5), and the pull belt (3) slides in contact with the outer circumferential surface of the rubber sleeve (6) when stretched.

7. The protective mechanism for the driver's cab door according to claim 6, characterized in that: The height of the rubber sleeve (6) is less than the vertical distance from the upper end face to the lower end face of the second mounting bracket (2).

8. The protective mechanism for the driver's cab door according to claim 5, characterized in that: The first pin (11) is provided with a retaining ring (7) at one end near the lower end face of the first mounting bracket (1), and the second pin (12) and the third pin (5) are each provided with the same retaining ring (7) at one end near the lower end face of the second mounting bracket (2).

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