A handrail box structure and engineering machinery

Abstract

This utility model discloses an armrest box structure and engineering machinery, including an upper support assembly and a lower support assembly. The upper support assembly includes a handrest pad assembly, a first slide rail, and a support arranged sequentially from top to bottom. The first slide rail is arranged horizontally and connects the handrest pad assembly and the support. The handrest pad assembly can slide and lock relative to the support in the front-back direction. The lower support assembly includes a fixed seat distributed along the left and right sides, a second slide rail, and a support. The second slide rail is arranged vertically and connects the fixed seat and the support. The support can slide and lock relative to the fixed seat in the vertical direction. A support plate is fixedly installed on the upper part of the support. The rear end of the support is hinged to the support plate through a first pin, and the first pin extends axially along the left and right sides. This utility model can realize front-back, up-down, and flip-up adjustable functions, is simple to operate, and has a large adjustment range.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to a handrail box structure and engineering machinery. Background Technology

[0002] Typically, the armrest box in the cab of construction machinery is directly fixed to the seat. Some armrest boxes only have the ability to flip up and rotate to avoid the driver's passageway in and out of the cab; others have joints that allow local parts to swing left and right or forward and backward in addition to flipping up and rotating, in order to accommodate the operating needs of drivers of different sizes.

[0003] The shortcomings of existing technology: Currently, the structure of the armrest box in the cab of construction machinery is not adjustable, or it can only be adjusted by rotating and flipping or by partial swinging. This makes it difficult to adapt to drivers of different heights and meet the operating comfort of different drivers. The adjustable swing range is small, the applicable range is small, and the operating experience is poor. Utility Model Content

[0004] The purpose of this utility model is to provide an armrest box structure and engineering machinery to solve the problems of armrest boxes that are not adjustable or have a single adjustment direction and a small adjustment range in the prior art.

[0005] To achieve the above objectives, the present invention provides an armrest box structure, including an upper support assembly and a lower support assembly. The upper support assembly includes a backrest pad assembly, a first slide rail, and a support arranged sequentially from top to bottom. The first slide rail is arranged horizontally and connects the backrest pad assembly and the support. The backrest pad assembly can slide and lock relative to the support in the front-back direction. The lower support assembly includes a fixed seat distributed along the left and right sides, a second slide rail, and a support. The second slide rail is arranged vertically and connects the fixed seat and the support. The support can slide and lock relative to the fixed seat in the vertical direction. A support plate is fixedly provided on the upper part of the support. The rear end of the support is hinged to the support plate through a first pin. The first pin extends axially along the left and right sides. The upper support assembly can rotate around the first pin, and the support can be locked relative to the support.

[0006] Furthermore, a first locking handle is rotatably provided on one side of the armrest assembly in the left-right direction, and a first toothed plate is fixedly provided on one side of the support in the left-right direction. The end of the first locking handle is toothed and engages with the first toothed plate. After engagement, the armrest assembly and the support are locked, preventing them from sliding relative to each other.

[0007] Furthermore, the first locking handle is connected to one end of the first return spring, and the other end of the first return spring is connected to the hand rest assembly. The first return spring is used to prevent the meshing teeth between the first locking handle and the first toothed plate from automatically disengaging.

[0008] Furthermore, the first locking handle is provided with a pin engagement hole, and a second pin is fixedly provided on one side of the armrest assembly in the left-right direction. The first locking handle is connected to the armrest assembly through the pin engagement hole and the second pin rotational engagement and slides with it.

[0009] Furthermore, the bottom of the support is fixedly connected to the lock body, the upper part of the bracket is fixedly connected to the latch, the latch is located in front of the support plate, and the lock body is locked in place with the latch; a third locking handle is rotatably provided on one side of the support in the left-right direction, and the third locking handle can drive the unlocking mechanism on the lock body so that the lock body is popped open and disengaged from the latch.

[0010] Furthermore, a first gas spring arranged horizontally is movably connected between one side of the support plate in the left-right direction and one side of the support in the left-right direction. The first gas spring is used to provide assistance for the upper bracket assembly to rotate around the first pin. A limiting device is provided at the rear end of the support. The limiting device can cooperate with the upper limiting device of the support. The limiting device is used to ensure that the support stops after rotating to a certain position, so that the upper bracket assembly is in a rearward vertical state.

[0011] Furthermore, a second toothed plate is welded to the upper rear side of the fixed base, and a third toothed plate is rotatably mounted on the upper rear side of the bracket via a rotating shaft. The teeth at the end of the third toothed plate mesh with the second toothed plate, and after meshing, the bracket and the fixed base are locked together in the vertical direction to prevent them from sliding relative to each other. A second gas spring arranged in the vertical direction is connected between the lower rear end of the fixed base and the upper rear end of the bracket. The second gas spring is used to assist in supporting the upward movement of the bracket.

[0012] Furthermore, a second locking handle is rotatably provided on one side of the support in the left-right direction. The front end of the second locking handle and the third toothed plate are respectively movably connected to both ends of the connecting rod. The rotation of the second locking handle can drive the connecting rod to move forward, thereby causing the third toothed plate to rotate around the rotation axis. The end of the third toothed plate is connected to one end of the second return spring, and the other end of the second return spring is connected to the bracket. The second return spring is used to re-engage and lock the third toothed plate with the second toothed plate.

[0013] Furthermore, the third locking handle is located in front of the second locking handle, and the rear end of the third locking handle and the front end of the second locking handle are assembled to the shaft on one side of the support in the left-right direction and can rotate around the shaft. The inner curved plate of the third locking handle can drive the unlocking mechanism on the lock body. The front end of the support is fixedly connected to the support frame, and the support frame is provided with an operating handle.

[0014] This utility model also provides an engineering machinery, including an engineering machinery body and a handrail box structure as described in any of the above technical solutions. The engineering machinery body is provided with a driver's cab seat, and the fixed seat is fixedly connected to the driver's cab seat.

[0015] In summary, the technical solution of this utility model has the following beneficial effects: The structure of this utility model is reasonable. (1) By setting an upper support assembly and a lower support assembly, the upper support assembly includes a handrest pad assembly, a first slide rail and a support arranged sequentially from top to bottom. The first slide rail is arranged horizontally and connects the handrest pad assembly and the support respectively. The handrest pad assembly can slide and lock relative to the support in the front and back direction. Thus, when the driver needs to adjust in the front and back direction, the lock between the handrest pad assembly and the support is released first, and then the handrest pad assembly is pushed to slide, which meets the driver's operation comfort requirements. After the front and back position adjustment is completed, the handrest pad assembly and the support are locked again. (2) By setting a lower support assembly including a fixed seat distributed along the left and right, a second slide rail and a support, the second slide rail is arranged vertically and connects the fixed seat and the support respectively. The support can slide and lock relative to the fixed seat in the vertical direction. Thus, when the driver needs to adjust the height up and down, the lock between the support and the fixed seat is released first, and then the upper support assembly and the support as a whole are pushed to slide up and down in the vertical direction. After the height adjustment is completed, the support and the fixed seat are locked again. (3) A support plate is fixedly installed on the upper part of the bracket. The rear end of the support is hinged to the support plate through a first pin. The first pin extends axially to the left and right. The upper bracket assembly can rotate around the first pin, and the support can be locked relative to the bracket. In order not to affect the passage space for entering and exiting the cab, the lock between the support and the bracket is first released, and then the upper bracket assembly is pushed upward and flipped until it stops at a certain position. The entire armrest box is in a vertical position facing backward, making room for the driver to enter and exit the cab. When it is necessary to rotate and reset, the upper bracket assembly is simply pulled back to the horizontal position, and the support and the bracket are locked again. As can be seen from the above analysis, this utility model can realize the functions of front and back, up and down and flipping. It is simple to operate, has a large adjustment range, and is widely applicable. It can meet the operating needs of drivers of different heights and sizes, adapt to the operation of drivers of different body sizes, and greatly improve the operating comfort of drivers. Attached Figure Description

[0016] Figure 1This is a three-dimensional structural diagram of the armrest box structure of this utility model from the first perspective;

[0017] Figure 2 This is a three-dimensional structural diagram of the armrest box structure of this utility model from a second perspective;

[0018] Figure 3 This is a three-dimensional structural diagram of the upper support assembly of this utility model;

[0019] Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure of region A in the middle;

[0020] Figure 5 This is a partial exploded structural diagram of the upper support assembly of this utility model;

[0021] Figure 6 This is a three-dimensional structural schematic diagram of the lower support assembly of this utility model from a first perspective.

[0022] Figure 7 This is a three-dimensional structural schematic diagram of the lower support assembly of this utility model from a second perspective.

[0023] Figure 8 This is a partial structural schematic diagram of the lower support assembly of this utility model;

[0024] Figure 9 This is a schematic diagram of the upper support assembly of this utility model in a rearward vertical position;

[0025] Explanation of reference numerals in the attached drawings: Operating handle (1), upper bracket assembly (2), connecting rod (3), first pin (4), first gas spring (5), lower bracket assembly (6); armrest assembly (21), first slide rail (22), first locking handle (23), first toothed plate (24), support (25), lock body (26), second locking handle (27), third locking handle (28), support frame (29); fixed seat (61), second gas spring (62), second toothed plate (63), support plate (64), lock (65), second slide rail (66), bracket (67), rotating shaft (68), third toothed plate (69). Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, but this does not constitute a limitation on the scope of protection of the present utility model.

[0027] In this utility model, for clearer description, the following explanation is provided: The observer faces the attached... Figure 1In this observation, the left side of the observer is designated as front, the right side as rear, the front of the observer as right, the rear of the observer as left, the top of the observer as up, and the bottom of the observer as down. It should be noted that the terms "front end," "rear end," "left side," "right side," "middle," "above," and "below" used in this document indicate the orientation or positional relationship based on the accompanying drawings. These are merely for the purpose of clearly describing the present invention and do not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used only for the purpose of clarity or simplification of description and should not be construed as indicating or implying relative importance or quantity.

[0028] See Figures 1 to 9This embodiment provides an armrest box structure, including an upper support assembly 2 and a lower support assembly 6. The upper support assembly 2 includes a handrest pad assembly 21, a first slide rail 22, and a support 25 arranged sequentially from top to bottom. The first slide rail 22 is arranged horizontally and connects the handrest pad assembly 21 and the support 25 respectively. The handrest pad assembly 21 can slide and lock relative to the support 25 in the front-back direction. The lower support assembly 6 includes a fixed seat 61 distributed along the left and right, a second slide rail 66, and a support 67. The second slide rail 66 is arranged vertically and connects the fixed seat 61 and the support 67 respectively. The support 67 can slide and lock relative to the fixed seat 61 in the vertical direction. A support plate 64 is fixedly provided on the upper part of the support 67. The rear end of the support 25 is hinged to the support plate 64 through a first pin 4. The first pin 4 extends axially along the left and right, allowing the upper support assembly 2 to rotate around the first pin 4 and the support 25 to be locked relative to the support 67. Functions: (1) By setting up an upper support assembly and a lower support assembly, the upper support assembly includes a handrest pad assembly, a first slide rail and a support arranged from top to bottom. The first slide rail is arranged horizontally and connects the handrest pad assembly and the support respectively. The handrest pad assembly can slide and lock relative to the support in the front-back direction. Thus, when the driver needs to adjust the front-back direction, the lock between the handrest pad assembly and the support is released first, and then the handrest pad assembly is pushed to slide, satisfying the driver's operation comfort requirements. After the front-back position adjustment is completed, the handrest pad assembly and the support are locked again. (2) By setting up a lower support assembly including a fixed seat distributed along the left and right, a second slide rail and a support, the second slide rail is arranged vertically and connects the fixed seat and the support respectively. The support can slide and lock relative to the fixed seat in the vertical direction. Thus, when the driver needs to adjust the height up and down, the lock between the support and the fixed seat is released first, and then the upper support assembly and the support as a whole are pushed to slide up and down in the vertical direction. After the height adjustment is completed, the support and the fixed seat are locked again. (3) A support plate is fixedly installed on the upper part of the bracket. The rear end of the support is hinged to the support plate through a first pin. The first pin extends axially to the left and right. The upper bracket assembly can rotate around the first pin, and the support can be locked relative to the bracket. In order not to affect the passage space for entering and exiting the cab, the lock between the support and the bracket is first released, and then the upper bracket assembly is pushed upward and flipped until it stops at a certain position. The entire armrest box is in a vertical position facing backward, making room for the driver to enter and exit the cab. When it is necessary to rotate and reset, the upper bracket assembly is simply pulled back to the horizontal position, and the support and the bracket are locked again. As can be seen from the above analysis, this utility model can realize the functions of front and back, up and down and flipping. It is simple to operate, has a large adjustment range, and is widely applicable. It can meet the operating needs of drivers of different heights and sizes, adapt to the operation of drivers of different body sizes, and greatly improve the operating comfort of drivers. Preferably, the first slide rail 22 is arranged horizontally and connected to the handrest pad assembly 21 and the support 25 by bolts, and the second slide rail 66 is arranged vertically and connected to the fixed seat 61 and the bracket 67 by bolts.

[0029] Specifically, a first locking handle 23 is rotatably mounted on one side of the handrest assembly 21 in the left-right direction, and a first toothed plate 24 is fixedly mounted on one side of the support 25 in the left-right direction. The end of the first locking handle 23 is toothed and engages with the first toothed plate 24. After engagement, the handrest assembly 21 and the support 25 are locked, preventing them from sliding relative to each other. Function: When the driver needs to adjust the position in the forward or backward direction, he operates the first locking handle 23 to rotate upward. At this time, the teeth on the first locking handle 23 disengage from the teeth on the first toothed plate 24, applying a force in the forward or backward horizontal direction to push the handrest assembly 21 to slide, meeting the driver's operating comfort requirements. After the forward or backward position adjustment is completed, the teeth of the first locking handle 23 and the first toothed plate 24 re-engage and lock.

[0030] Specifically, one end of the first locking handle 23 is connected to the first return spring, and the other end of the first return spring is connected to the hand rest assembly 21. The first return spring is used to prevent the meshing teeth between the first locking handle 23 and the first toothed plate 24 from automatically disengaging. Function: After the front and rear position adjustment is completed, the first locking handle 23 is released, and its first return spring causes the teeth of the first locking handle 23 and the first toothed plate 24 to re-engage and lock.

[0031] Specifically, the first locking handle 23 is provided with a pin engagement hole, and a second pin is fixedly provided on one side of the hand rest assembly 21 in the left-right direction. The first locking handle 23 is connected to the hand rest assembly 21 through the pin engagement hole and the rotational engagement of the second pin, and slides with it. Function: The rotational engagement of the pin engagement hole and the second pin realizes the rotational setting of the first locking handle 23.

[0032] In practical application: When the driver needs to adjust the forward and backward direction, he manually rotates the first locking handle 23 upward. At this time, the teeth on the first locking handle 23 disengage from the teeth on the first toothed plate 24, and a horizontal force is applied to push the armrest assembly 21 to slide. At this time, the components fixed to the armrest assembly 21, including the operating handle 1 and the support frame 29, also slide, satisfying the driver's comfort requirements for operating the operating handle 1. After the forward and backward position adjustment is completed, the first locking handle 23 is released, and its first return spring causes the teeth of the first locking handle 23 and the first toothed plate 24 to re-engage and lock.

[0033] Specifically, the bottom of the support 25 is fixedly connected to the lock body 26, and the upper part of the bracket 67 is fixedly connected to the latch 65. The latch 65 is located in front of the support plate 64, and the lock body 26 and the latch 65 are locked together. A third locking handle 28 is rotatably provided on one side of the support 25 in the left-right direction. The third locking handle 28 can drive the unlocking mechanism on the lock body 26, so that the lock body 26 is popped open and disengaged from the latch 65. Function: This armrest box is usually used on the left side of the driver's seat in the cab of construction machinery. In order not to affect the passage space for entering and exiting the cab, the third locking handle 28 is operated by hand to rotate clockwise upward, which drives the unlocking mechanism on the lock body 26. After the lock body 26 is popped open and disengaged from the latch 65, the upper bracket assembly 2 flips upward until it stops at a certain position. The entire armrest box is in a vertical position facing backward, making room for the driver to enter and exit the cab. When it is necessary to rotate and reset, it is only necessary to apply force by hand to pull the upper bracket assembly 2 back until the lock body 26 and the latch 65 are closed, so that the upper bracket assembly 2 is in a locked state. Preferably, the lock body 26 is fastened to the support 25 by bolts, and the latch 65 is mounted on the bracket 67 by bolts.

[0034] Specifically, a first gas spring 5, arranged horizontally, is movably connected between one side of the support plate 64 in the left-right direction and one side of the support 25 in the left-right direction. The first gas spring 5 provides assistance for the upper bracket assembly 2 to rotate around the first pin 4. A limiting device is provided at the rear end of the support 25, which can cooperate with the upper limiting device of the bracket 67. The limiting device is used to ensure that the support 25 stops after rotating to a certain position, so that the upper bracket assembly 2 is in a rearward vertical state. Function: Under the assistance of the first gas spring 5, the upper bracket assembly 2 slowly rotates upward until it stops at a certain position, and the entire armrest box is in a rearward vertical state, making room for the driver to enter and exit the cab.

[0035] In practical applications: This armrest box is typically placed on the left side of the driver's seat in the cab of construction machinery. To avoid obstructing the passageway for entering and exiting the cab, the third locking handle 28 is manually rotated clockwise upwards. The inner curved plate of the handle rotates accordingly, driving the unlocking mechanism on the lock body 26. After the lock body 26 is released and disengaged from the latch 65, the upper support assembly 2 and the operating handle 1 slowly rotate upwards with the assistance of the first gas spring 5 until they reach a certain position and stop. The entire armrest box is then in a vertical, rearward position, allowing for easier passage for the driver to enter and exit the cab. When it is necessary to rotate and reset, simply apply force by hand to pull the upper support assembly 2 back until the lock body 26 and latch 65 are closed, thus locking the upper support assembly 2.

[0036] Specifically, a second toothed plate 63 is welded to the upper rear side of the fixed base 61, and a third toothed plate 69 is rotatably mounted on the upper rear side of the bracket 67 via a rotating shaft 68. The teeth at the end of the third toothed plate 69 mesh with the second toothed plate 63, locking the bracket 67 and the fixed base 61 vertically to prevent relative sliding. A second gas spring 62, arranged vertically, connects the lower rear end of the fixed base 61 and the upper rear end of the bracket 67, assisting in supporting the upward movement of the bracket 67. Function: When the driver needs to adjust the height, the third toothed plate 69 rotates counterclockwise around the rotating shaft 68. At this time, the teeth on the third toothed plate 69 disengage from the second toothed plate 63, and the upper bracket assembly 2 slides vertically up and down. During the sliding process, the second gas spring 62 provides auxiliary support force to make the adjustment easier. After the vertical adjustment is completed, the third toothed plate 69 re-engages and locks with the second toothed plate 63.

[0037] Specifically, a second locking handle 27 is rotatably mounted on one side of the support 25 in the left-right direction. The front ends of the second locking handle 27 and the third toothed plate 69 are respectively movably connected to both ends of the connecting rod 3. Rotation of the second locking handle 27 can drive the connecting rod 3 to move forward, thereby causing the third toothed plate 69 to rotate around the rotation axis 68. The end of the third toothed plate 69 is connected to one end of the second return spring, and the other end of the second return spring is connected to the bracket 67. The second return spring is used to re-engage and lock the third toothed plate 69 and the second toothed plate 63. Function: When the driver needs to adjust the height, he manually operates the second locking handle 27 to rotate counterclockwise upward, driving the connecting rod 3 to move forward, thereby causing the third toothed plate 69 to rotate counterclockwise around the rotation axis 68. After the height adjustment is completed, the second locking handle 27 is released, and its second return spring re-engages and locks the third toothed plate 69 and the second toothed plate 63.

[0038] In practical application: When the driver needs to adjust the height, he manually operates the second locking handle 27 to rotate counterclockwise upwards, causing the connecting rod 3 to move forward. This, in turn, causes the third toothed plate 69 to rotate counterclockwise around the rotation axis 68. At this time, the teeth on the third toothed plate 69 disengage from the second toothed plate 63, and the upper bracket assembly 2, operating handle 1, and bracket 67 slide vertically up and down as a whole. During the sliding process, the second gas spring 62 provides auxiliary support force to make the adjustment easier. After the vertical position adjustment is completed, the second locking handle 27 is released, and its second return spring re-engages and locks the third toothed plate 69 with the second toothed plate 63.

[0039] Specifically, the third locking handle 28 is located in front of the second locking handle 27. The rear end of the third locking handle 28 and the front end of the second locking handle 27 are mounted on a shaft on one side of the support 25 in the left-right direction and can rotate around the shaft. The inner curved plate of the handle of the third locking handle 28 can drive the unlocking mechanism on the lock body 26. The front end of the support 25 is fixedly connected to the support frame 29, and the support frame 29 is provided with an operating handle 1. Function: Its structure is novel and compact; the locking handles are centrally arranged, making operation simple. Preferably, the support frame 29 is fastened to the support 25 with bolts.

[0040] This utility model also provides a piece of construction machinery, including a machinery body and a handrail box structure according to any of the above-mentioned technical solutions. The machinery body is equipped with a driver's seat, and a fixed base 61 is fixedly connected to the driver's seat. Function: The handrail box allows for multi-directional and large-scale adjustment (forward and backward, up and down, tilting), and the mechanical structure is robust and reliable. Applications of this handrail box structure: loaders and construction machinery equipped with handrail boxes. Preferably, the fixed base 61 has bolt mounting holes for fastening to the seat with bolts.

[0041] In summary, this utility model adopts a combination of double slide rails and toothed locking structure, and is equipped with a flip hinge point to realize the front-to-back, up-to-down, and overall flip adjustment of the armrest box, which can adapt to the operation of drivers of different sizes and improve the operating comfort.

[0042] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A handrail box structure comprising an upper bracket assembly (2) and a lower bracket assembly (6), characterised in that: The upper support assembly (2) includes a handrest pad assembly (21), a first slide rail (22), and a support (25) arranged sequentially from top to bottom. The first slide rail (22) is arranged horizontally and connects the handrest pad assembly (21) and the support (25) respectively. The handrest pad assembly (21) can slide and lock relative to the support (25) in the front-back direction. The lower support assembly (6) includes a fixed seat (61) distributed along the left and right sides, a second slide rail (66), and a support (67). The second slide rail (66) is arranged vertically. The fixed base (61) and the bracket (67) are respectively connected. The bracket (67) can slide and lock vertically relative to the fixed base (61). A support plate (64) is fixedly provided on the upper part of the bracket (67). The rear end of the support (25) is hinged to the support plate (64) through a first pin (4). The first pin (4) extends axially to the left and right. The upper bracket assembly (2) can rotate around the first pin (4) and the support (25) can be locked relative to the bracket (67).

2. The structure of claim 1, wherein: The armrest assembly (21) is rotatably provided with a first locking handle (23) on one side in the left-right direction, and the support (25) is fixedly provided with a first toothed plate (24) on one side in the left-right direction. The end of the first locking handle (23) is toothed and engages with the first toothed plate (24). After engagement, the armrest assembly (21) and the support (25) are locked, preventing them from sliding relative to each other.

3. The structure of claim 2, wherein: The first locking handle (23) is connected to one end of the first return spring, and the other end of the first return spring is connected to the armrest assembly (21). The first return spring is used to prevent the meshing teeth between the first locking handle (23) and the first toothed plate (24) from automatically separating.

4. The structure of claim 2, wherein: The first locking handle (23) is provided with a pin engagement hole. A second pin is fixedly provided on one side of the armrest assembly (21) in the left-right direction. The first locking handle (23) is connected to the armrest assembly (21) through the pin engagement hole and the second pin in a rotational engagement and slides with it.

5. A structure for an armrest box according to any one of claims 1 to 4, characterized in that: The bottom of the support (25) is fixedly connected to the lock body (26), and the upper part of the bracket (67) is fixedly connected to the latch (65). The latch (65) is located in front of the support plate (64), and the lock body (26) is locked to the latch (65). A third locking handle (28) is rotatably provided on one side of the support (25) in the left-right direction. The third locking handle (28) can drive the unlocking mechanism on the lock body (26) so that the lock body (26) is popped open and disengaged from the latch (65).

6. The structure of claim 5, wherein: A first gas spring (5) arranged horizontally is movably connected between one side of the support plate (64) in the left-right direction and one side of the support (25) in the left-right direction. The first gas spring (5) is used to provide assistance for the upper bracket assembly (2) to rotate around the first pin (4). The rear end of the support (25) is provided with a limiting device. The limiting device can cooperate with the upper limiting of the bracket (67). The limiting device is used to ensure that the support (25) stops after rotating to a certain position, so that the upper bracket assembly (2) is in a vertical state facing backward.

7. The structure of claim 5, wherein: A second toothed plate (63) is welded to the upper rear side of the fixed base (61), and a third toothed plate (69) is rotatably provided on the upper rear side of the bracket (67) via a rotating shaft (68). The teeth at the end of the third toothed plate (69) mesh with the second toothed plate (63). After meshing, the bracket (67) and the fixed base (61) are locked together in the vertical direction to prevent them from sliding relative to each other. A second gas spring (62) arranged in the vertical direction is connected between the lower rear end of the fixed base (61) and the upper rear end of the bracket (67). The second gas spring (62) is used to assist in supporting the bracket (67) to move upward.

8. The structure of claim 7, wherein: A second locking handle (27) is rotatably provided on one side of the support (25) in the left-right direction. The front end of the second locking handle (27) and the third toothed plate (69) are respectively movably connected to both ends of the connecting rod (3). The rotation of the second locking handle (27) can drive the connecting rod (3) to move forward, thereby causing the third toothed plate (69) to rotate around the rotating axis (68). The end of the third toothed plate (69) is connected to one end of the second return spring, and the other end of the second return spring is connected to the bracket (67). The second return spring is used to re-engage and lock the third toothed plate (69) and the second toothed plate (63).

9. The structure of claim 8, wherein: The third locking handle (28) is located in front of the second locking handle (27). The rear end of the third locking handle (28) and the front end of the second locking handle (27) are assembled to the shaft on one side of the support (25) in the left-right direction and can rotate around the shaft. The inner curved plate of the handle of the third locking handle (28) can drive the unlocking mechanism on the lock body (26). The front end of the support (25) is fixedly connected to the support frame (29), and the support frame (29) is provided with an operating handle (1).

10. A working machine comprising a working machine body, characterised in that: It also includes the armrest box structure according to any one of claims 1 to 9, wherein the engineering machinery body is provided with a driver's cab seat, and the fixed seat (61) is fixedly connected to the driver's cab seat.

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