Limiting mechanism of pivot door body and working machine

Abstract

The utility model provides a kind of limiting mechanism and working machine of pivoted door body, the limiting mechanism includes: first limiting plate, first limiting plate is rotatably installed in rack;Second limiting plate, second limiting plate is rotatably installed in door body, by the pin shaft and the groove connection to first limiting plate with mutual cooperation, to by the both ends of groove limit the maximum open angle position and limiting position of door body, wherein, when door body is located in limiting position, the included angle between second limiting plate and first limiting plate is formed;And, baffle, baffle is fixed in rack or door body, and it is located in the side away from the included angle formed between second limiting plate and first limiting plate. By the above technical scheme, in the process that door body freely falls back, pin shaft moves from the first end of groove to the second end of sliding, so that two limiting plates deflect to the same side, then further deflect two limiting plates using baffle to prevent the rotation of door body to closed state, to realize the limiting of door body.

Description

Technical Field

[0001] This utility model relates to the field of operating machinery technology, and in particular to a limiting mechanism for a pivoting gate and operating machinery. Background Technology

[0002] To meet maintenance requirements, the doors on the machine body that serve a maintenance function need to remain fixed in position after being opened to a certain angle, so that operators can carry out maintenance work. Taking skid steer loaders as an example, because the rear hatch of a skid steer loader is heavy and also has auxiliary devices such as fuel tanks installed on it, the overall weight is relatively large. Therefore, a rear door limit mechanism is set up to keep the door in a fixed position after it is opened, so as to facilitate maintenance.

[0003] However, the existing limit mechanism uses a pin-type manual insertion and removal limit, so both opening and closing the rear door require manual limit operation. If the operator forgets to manually lock the rear door during maintenance, the door's movement can easily cause injury. In some cases, if the rear door abnormally unlocks or the operator fails to effectively lock the rear door while operating the equipment, the rear door may rotate around the hinge due to inertia, causing damage to the frame, the rear door, and accessories mounted on the rear door. Utility Model Content

[0004] One of the technical problems that this utility model aims to solve is: how to provide a door limiting mechanism that is easy to operate.

[0005] To solve the above-mentioned technical problems, this utility model provides a limiting mechanism for a pivoting door. The door is pivotally connected to a frame via a hinge mechanism to rotate between a closed state and an open state. The limiting mechanism includes: a first limiting plate rotatably mounted on the frame; a second limiting plate rotatably mounted on the door and connected to the first limiting plate via a cooperating pin and a sliding groove, wherein the two ends of the sliding groove define the maximum opening angle position and the limiting position of the door, wherein when the door is in the limiting position, an angle is formed between the second limiting plate and the first limiting plate; and a baffle fixed to the frame or the door and located on the side opposite to the angle formed between the second limiting plate and the first limiting plate, thereby preventing the door from rotating to the closed state by blocking the relative rotation of the second limiting plate and the first limiting plate to reduce the angle between them.

[0006] In some embodiments, the first limiting plate is rotatably connected to the frame by a first bolt; the second limiting plate is rotatably connected to the door by a second bolt.

[0007] In some embodiments, the frame is provided with a crash beam and the door is provided with a connecting plate; wherein, the first limiting plate is installed on the crash beam and the second limiting plate is installed on the connecting plate.

[0008] In some embodiments, a baffle is disposed on the connecting plate to achieve a limiting effect by blocking the rotation of the second limiting plate.

[0009] In some embodiments, the first limiting plate is provided with a first threaded hole seat for supporting on the anti-collision beam, and a first bolt passes through the first threaded hole seat to connect to the anti-collision beam; the second limiting plate is provided with a second threaded hole seat for supporting on the connecting plate, and a second bolt passes through the second threaded hole seat to connect to the connecting plate.

[0010] In some embodiments, a first gasket is provided between the first threaded hole seat and the anti-collision beam, and a second gasket is provided between the second threaded hole seat and the connecting plate.

[0011] In some embodiments, the pin is fixedly connected to the first limiting plate, the slide groove is formed on the second limiting plate, and an anti-detachment pin is installed at one end of the pin extending out of the slide groove.

[0012] In some embodiments, the center line of the extended groove has an angle of no more than 5° with the center line of the extended groove of the first or second limiting plate on which the groove is formed.

[0013] In some embodiments, when the door rotates to a “dead point position” where the extended center lines of the first and second limiting plates coincide, the pin is spaced apart from the end of the slide to allow the door to continue rotating toward the closed state.

[0014] This utility model also provides a working machine, which includes a door that is pivotally connected to the body of the vehicle via a hinge mechanism, and the aforementioned limiting mechanism is provided between the body of the vehicle and the door.

[0015] Using the above technical solution, the worker rotates the door to its maximum opening angle, with the pin located at the first end of the slide. Then, during the door's free fall, the pin moves to the second end of the slide, causing the first and second limiting plates to deflect to the same side and form an angle. A baffle set on this side then restricts the two limiting plates from further deflecting, preventing the door from rotating to the closed state, thus achieving the door's limiting position and effectively simplifying the door's limiting operation. 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the limiting mechanism of this utility model;

[0018] Figure 2 This is an exploded view of the limiting mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the second limiting plate of this utility model;

[0020] Figure 4 This is a top view of the limiting mechanism of this utility model at its maximum opening angle.

[0021] Figure 5 This is a top view of the limiting mechanism of this utility model in the limiting position;

[0022] Figure 6 This is a top view of the limiting mechanism of this utility model in the closed state of the door;

[0023] Figure 7 This is a top view of the limiting mechanism of this utility model when it is in the dead position.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. First limiting plate; 2. Second limiting plate; 3. Pin; 4. Slide groove; 5. Baffle; 6. Frame; 7. Door body; 8. First bolt; 9. Second bolt; 10. Anti-loosening nut; 11. Anti-collision beam; 12. Connecting plate; 13. First threaded hole seat; 14. Second threaded hole seat; 15. First washer; 16. Second washer; 17. Anti-detachment pin; 18. Hinge seat; 19. Hinge arm. Detailed Implementation

[0026] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principles of this utility model, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments described herein, but includes all technical solutions falling within the scope of the claims.

[0027] These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0028] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, 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, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0030] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0031] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0033] like Figures 1-7As shown, this utility model provides a limiting mechanism for a pivoting door. The door 7 is pivotally connected to the frame 6 via a hinge mechanism so that it can rotate between a closed state and an open state. The limiting mechanism includes: a first limiting plate 1, which is rotatably mounted on the frame 6; a second limiting plate 2, which is rotatably mounted on the door 7 and connected to the first limiting plate 1 via a cooperating pin 3 and a slide 4, so that the maximum opening angle position and the limiting position of the door 7 are defined by the two ends of the slide 4, wherein when the door 7 is in the limiting position, an angle is formed between the second limiting plate 2 and the first limiting plate 1; and a baffle 5, which is fixed to the frame 6 or the door 7 and is located on the side opposite to the angle formed between the second limiting plate 2 and the first limiting plate 1, so as to prevent the door 7 from rotating to the closed state by blocking the relative rotation of the second limiting plate 2 and the first limiting plate 1 to reduce the angle between them.

[0034] Specifically, such as Figure 4 As shown, when the door 7 rotates to its maximum opening angle, the first limiting plate 1 and the second limiting plate 2 are pulled by the frame 6 and the door 7 respectively, causing the extended center lines of the first limiting plate 1 and the second limiting plate 2 to coincide, and the two are connected sequentially along a straight line, with the pin 3 sliding to the first end of the slide groove 4; when the door 7 rotates from its maximum opening angle to the closed state, as... Figure 5 As shown, the first limiting plate 1 and the second limiting plate 2 are respectively squeezed by the frame 6 and the door 7. The pin 3 slides to the second end of the slide groove 4, so that the first limiting plate 1 and the second limiting plate 2 form an angle. In this process, pushing the first limiting plate 1 or the second limiting plate 2 causes it to deflect towards the baffle 5 to form an angle. This works in conjunction with the baffle 5 set on the side away from the angle to block the continued rotation of the first limiting plate 1 and the second limiting plate 2 under the squeezing action of the frame 6 and the door 7, thereby preventing the door 7 from rotating to the closed state, so that the door 7 reaches the limited position (e.g., Figure 5 (as shown in the figure) to achieve the limiting position. In addition, the pin 3 can be set on either the first limiting plate 1 or the second limiting plate 2, and the slide groove 4 can be set on the other of the first limiting plate 1 or the second limiting plate 2 to achieve the mating connection between the two.

[0035] In some embodiments, when the door 7 rotates to the maximum opening angle position, the extension center lines of the first limiting plate 1 and the second limiting plate 2 coincide, and the second end of the slide groove 4 is disposed on the first side of the coincident extension center line; when the door 7 rotates from the maximum opening angle position to the closed state, the pin 3 slides to the second end of the slide groove 4, so that the connection between the first limiting plate 1 and the second limiting plate 2 can automatically move to the second side of the aforementioned coincident extension center line to form an angle, and then enter the limiting state through the baffle 5 disposed on the side away from the angle (i.e., the second side of the aforementioned extension center line). The limiting can be automatically formed without manual intervention, which effectively improves the operational convenience of the limiting mechanism. In this case, since the sliding friction generated when the pin 3 slides in the slide groove 4 is much smaller than the rotational friction generated between the first limiting plate 1 and the frame 6 and between the second limiting plate 2 and the door body 7, when the door body 7 rotates from the maximum opening angle position to the closed position, the pin 3 first slides to the second end of the slide groove 4 to ensure that the first limiting plate 1 and the second limiting plate 2 rotate toward the baffle 5. Even if the door body 7 is affected by external factors such as equipment vibration and rotates back and forth between the limiting position and the maximum opening angle position, it can always maintain the limiting effect and achieve automatic and stable limiting.

[0036] like Figure 1 , Figure 2 as well as Figures 4-7 As shown, in some embodiments, the first limiting plate 1 is rotatably connected to the frame 6 by the first bolt 8; the second limiting plate 2 is rotatably connected to the door body 7 by the second bolt 9.

[0037] Specifically, to facilitate the installation and maintenance of the limiting mechanism, the first limiting plate 1 and the frame 6 are rotatably connected by a first bolt 8 passing through them. One end of the first bolt 8 is provided with an anti-loosening nut 10, which works with the bolt base at its other end to achieve axial limiting. The second limiting plate 2 and the door body 7 are rotatably connected by a second bolt 9 passing through them. One end of the second bolt 9 is provided with an anti-loosening nut 10, which works with the bolt base at its other end to achieve axial limiting, thus forming a stable limiting mechanism.

[0038] like Figure 1 and Figure 2 As shown, in some embodiments, the frame 6 is provided with a crash beam 11 and the door 7 is provided with a connecting plate 12; wherein, the first limiting plate 1 is installed on the crash beam 11 and the second limiting plate 2 is installed on the connecting plate 12.

[0039] Specifically, the first limiting plate 1 is rotatably mounted on the anti-collision beam 11 of the frame 6 via the first bolt 8, and the second limiting plate 2 is rotatably mounted on the connecting plate 12 of the door body 7 via the second bolt 9. The planes containing the first limiting plate 1, the second limiting plate 2, the anti-collision beam 11, and the connecting plate 12 are all parallel to each other to facilitate the operation of the limiting mechanism. To prevent the anti-collision beam 11 and the connecting plate 12 from colliding when the door body 1 rotates to the closed position, as follows... Figure 1 and Figure 2 As shown, the anti-collision beam 11 and the connecting plate 12 are staggered along the height direction, and the first limiting plate 1 and the second limiting plate 2 are positioned between them along the height direction.

[0040] like Figure 1 , Figure 2 and Figure 5 As shown, in some embodiments, the baffle 5 is disposed on the connecting plate 12 to achieve a limiting effect by blocking the rotation of the second limiting plate 2. Specifically, with Figure 2 For example, the first limiting plate 1 and the second limiting plate 2 are arranged along the height direction between the anti-collision beam 11 and the connecting plate 12. The baffle 5 is installed below the connecting plate 12. When the door 7 rotates from the maximum opening angle position to the closed state, the pin 3 slides to the second end of the slide groove 4. At this time, the second limiting plate 2 is restricted by the baffle 5 and cannot continue to rotate, so that the door 7 is kept in the limited position. In other embodiments, the baffle 5 can be fixed to the frame 6 or other positions of the door 7, and is located on the side away from the angle formed by the first limiting baffle 1 and the second limiting baffle 2 in the limited position, so as to block the relative rotation of the first limiting plate 1 and the second limiting plate 2 in the limited state to reduce the angle between them, thereby realizing the automatic limiting of the door 7.

[0041] like Figure 1 and Figure 2 As shown, in some embodiments, the first limiting plate 1 is provided with a first threaded hole seat 13 for supporting on the anti-collision beam 11, and the first bolt 8 passes through the first threaded hole seat 13 and is connected to the anti-collision beam 11; the second limiting plate 2 is provided with a second threaded hole seat 14 for supporting on the connecting plate 12, and the second bolt 9 passes through the second threaded hole seat 14 and is connected to the connecting plate 12.

[0042] Specifically, to enhance the structural strength of the limiting mechanism and improve its stability during rotation, a first threaded hole seat 13 extending axially along the first bolt 8 is provided on the first limiting plate 1. The first bolt 8 is threaded into the first threaded hole seat 13 and then connected to the anti-collision beam. A second threaded hole seat 14 extending axially along the second bolt 9 is provided on the second limiting plate 2. The second bolt 9 is threaded into the first threaded hole seat 13 and then connected to the connecting plate 12. This effectively strengthens the connection strength and stability of the various components in the limiting mechanism during rotation. In other embodiments, to further enhance the connection stability between components, Figure 2 For example, threaded hole seats for bolts to pass through can also be provided on the top surface of the connecting plate 12 and / or the bottom surface of the anti-collision beam 11.

[0043] like Figure 2 As shown, in some embodiments, a first gasket 15 is provided between the first threaded hole seat 13 and the anti-collision beam 11, and a second gasket 16 is provided between the second threaded hole seat 14 and the connecting plate 12. Specifically, providing the first gasket 15 and the second gasket 16 can reduce wear during the relative rotation of components, eliminate abnormal noise during the operation of the limiting mechanism, and help improve the service life of the limiting mechanism. The first gasket 15 and the second gasket 16 are typically made of rubber, which can effectively enhance the rotational friction between the first limiting plate 1 and the anti-collision beam 11, and between the second limiting plate 2 and the connecting plate 12, thereby reducing equipment vibration.

[0044] like Figure 1 and Figure 2 As shown, in some embodiments, the pin 3 is fixedly connected to the first limiting plate 1, the slide groove 4 is formed on the second limiting plate 2, and an anti-detachment pin 17 is installed at one end of the pin 3 extending out of the slide groove 4. Specifically, the anti-detachment pin 17 passes through the end of the pin 3 and abuts against the upper surface of the second limiting plate 2 to prevent the pin 3 from disengaging from the slide groove 4. In other embodiments, the pin 3 can also be disposed on the second limiting plate 2, while the slide groove 4 is formed on the first limiting plate 2.

[0045] In some embodiments, the hinge mechanism includes a hinge seat 18 disposed on the frame 6, a hinge arm disposed on the door body 7, and a pivot shaft that makes the two hinged. The hinge mechanism is used to bear the rotational load of the door body 7, and the first limiting plate 1, the second limiting plate 2, and other structures are used to limit the structure during the rotation of the door body 7.

[0046] like Figure 3 As shown, in some embodiments, the extension center line of the groove 4 has an angle of no more than 5° with the extension center line of the first limiting plate 1 or the second limiting plate 2 on which the groove 4 is formed.

[0047] Specifically, taking the formation of the groove 4 and the second limiting plate 2 as an example, combined with the attached... Figure 3To explain, the first end of the slide groove 4 is the left end, and the second end is the right end. When the door 7 is rotated to its maximum opening angle, the extended center lines of the first limiting plate 1 and the second limiting plate 2 coincide, and the pin 3 slides to the left end of the slide groove 4. At this time, the pin 3 is located on the coincident extended center line. When the door 7 rotates from the maximum opening angle position to the closed position, the pin 3 slides to the right end of the slide groove 4. Since there is an angle of no more than 5° between the extended center line of the slide groove 4 and the extended center line of the second limiting plate 2, the pin 3 slides to the first side of the extended center line of the second limiting plate 2. During this process, the connection between the second limiting plate 2 and the first limiting plate 1 moves to the second side of the extended center line of the aforementioned coincident state, so that the center extension line of the first limiting plate 1 and the second limiting plate 2 form an angle of no more than 5°. This reduces the angle difference between the maximum opening angle position and the limiting position of the door 7, ensuring that the door 7 has a sufficient opening angle when it is in the limiting position, which facilitates maintenance work. In other embodiments, the opening angle of the door 7 in the limited state can also be adjusted by adjusting the position of the baffle 5.

[0048] like Figure 7 As shown, in some embodiments, when the door 7 rotates to the "dead point position" where the extended center lines of the first limiting plate 1 and the second limiting plate 2 coincide, the pin 3 is spaced apart from the end of the slide groove 4 to allow the door 7 to continue rotating toward the closed state.

[0049] Specifically, with Figure 7 For example, the second limiting plate 2 acts as the driving component, and the first limiting plate 1 acts as the driven component. Together with the frame 6 and the door 7, they form a four-bar linkage. During the rotation of the door 7 towards the closed state, there is a situation where the first limiting plate 1 and the second limiting plate 2 fold and their respective extension center lines coincide again. If the pin 3 is also located on the coincident extension center line and at the end of the slide groove 4, i.e., under stress, the transmission angle of the first limiting plate 1 is zero, and the four-bar linkage is in a "dead position." Combined with the machining errors or installation deviations between the components, this can easily cause the door 7 to experience "..." during rotation. To avoid the "locking" phenomenon, the slide 4 is designed such that when the door 7 rotates to the "dead point position" where the extended center lines of the first limiting plate 1 and the second limiting plate 2 coincide, due to the certain length of the slide 4, the pin 3 is not at the end of the slide 4 facing the door 7. That is, the pin 3 will not provide a reaction force along the extended center line of the second limiting plate 2, thus preventing the second limiting plate 2 from being subjected to forces of the same magnitude but opposite direction at both ends and entering the "dead point position." This effectively avoids the "locking" phenomenon during the rotation of the door 7, ensuring that the door 7 can rotate to the desired position. Figure 6 The closed state shown improves the reliability of the mechanism's operation.

[0050] This utility model also provides a working machine, which includes a door that is pivotally connected to the body of the vehicle via a hinge mechanism, and the aforementioned limiting mechanism is provided between the body of the vehicle and the door.

[0051] Specifically, when the operator opens the door of the work machinery, they rotate it to the maximum opening angle. The door then automatically rotates back to the closed position, and the pin 3 slides to the second end of the slide groove 4, forming an angle between the first limiting plate 1 and the second limiting plate 2. In conjunction with the baffle 5 set on the side opposite to the angle, the first limiting plate 1 and the second limiting plate 2 are prevented from continuing to rotate, thus preventing the door from rotating to the closed position and achieving the limiting effect. Compared with the existing technology where manual operation is required when opening and closing the door, this effectively simplifies the limiting operation and avoids the situation where the door is not locked due to human error.

[0052] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions described herein based on the above description.

[0053] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A limiting mechanism for a pivoting door, the door (7) being pivotally connected to a frame (6) by a hinge mechanism to be able to rotate between a closed state and an open state, characterized in that, The limiting mechanism includes: First limiting plate (1), the first limiting plate (1) is rotatably mounted on the frame (6); A second limiting plate (2) is rotatably mounted on the door body (7) and connected to the first limiting plate (1) via a mating pin (3) and a sliding groove (4). The sliding groove (4) defines the maximum opening angle and the limiting position of the door body (7). When the door body (7) is in the limiting position, an angle is formed between the second limiting plate (2) and the first limiting plate (1). A baffle (5) is fixed to the frame (6) or the door (7) and is located on the side opposite to the included angle formed between the second limiting plate (2) and the first limiting plate (1) to prevent the door (7) from rotating to the closed state by blocking the relative rotation of the second limiting plate (2) and the first limiting plate (1) to reduce the included angle between them.

2. The stopper mechanism for a pivoting door according to claim 1, wherein The first limiting plate (1) is rotatably connected to the frame (6) by the first bolt (8); the second limiting plate (2) is rotatably connected to the door body (7) by the second bolt (9).

3. The stop mechanism for a pivoting door according to claim 2, wherein The frame (6) is provided with a crash beam (11), and the door (7) is provided with a connecting plate (12); wherein, the first limiting plate (1) is installed on the crash beam (11), and the second limiting plate (2) is installed on the connecting plate (12).

4. The stop mechanism for a pivoting door according to claim 3, wherein The baffle (5) is disposed on the connecting plate (12) to achieve a limiting effect by blocking the rotation of the second limiting plate (2).

5. The stop mechanism for a pivoting door according to claim 3, wherein The first limiting plate (1) is provided with a first threaded hole seat (13) for supporting the anti-collision beam (11), and the first bolt (8) passes through the first threaded hole seat (13) and is connected to the anti-collision beam (11); the second limiting plate (2) is provided with a second threaded hole seat (14) for supporting the connecting plate (12), and the second bolt (9) passes through the second threaded hole seat (14) and is connected to the connecting plate (12).

6. The stop mechanism for a pivoting door according to claim 5, wherein, A first gasket (15) is provided between the first threaded hole seat (13) and the anti-collision beam (11), and a second gasket (16) is provided between the second threaded hole seat (14) and the connecting plate (12).

7. The pivot door check mechanism of claim 1, wherein, The pin (3) is fixedly connected to the first limiting plate (1), the slide groove (4) is formed on the second limiting plate (2), and an anti-detachment pin (17) is installed at one end of the pin (3) extending out of the slide groove (4).

8. The stopper mechanism of a pivoting door according to any one of claims 1 to 7, characterized in that, The extension center line of the groove (4) has an angle of no more than 5° with the extension center line of the first limiting plate (1) or the second limiting plate (2) on which the groove (4) is formed.

9. The stopper mechanism of a pivoting door according to any one of claims 1 to 7, characterized in that, When the door (7) rotates to the "dead point position" where the extended center lines of the first limiting plate (1) and the second limiting plate (2) coincide, the pin (3) is spaced apart from the end of the slide (4) to allow the door (7) to continue rotating toward the closed state.

10. A work machine characterized by, The work machine comprises a door which is pivotally connected to a vehicle body main body by a hinge mechanism, and a position limiting mechanism according to any one of claims 1 to 9 is provided between the vehicle body main body and the door.

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