Cab lifting mechanism and wheel excavator

Abstract

This utility model discloses a cab lifting mechanism and a wheeled excavator, belonging to the field of engineering machinery technology. It includes a mounting base on the chassis, a rear support mounted above the mounting base, a lifting arm and connecting rod rotatably assembled with the rear support, a telescopic cylinder for driving the lifting arm's raising and lowering, and a cab base that is raised and lowered via the lifting arm. The cab base is mounted on the bottom surface of the cab to support its raising and lowering. Only one telescopic cylinder is provided, rotatably mounted at the center of the width direction between the rear support and the lifting arm. The connecting rod, lifting arm, rear support, and cab base form a parallelogram linkage mechanism to control the cab base to maintain a horizontal state during raising and lowering. This utility model's cab lifting mechanism improves mechanical performance by changing the installation position of the rear support and the chassis; by reducing the number of telescopic cylinders, it simplifies the structure and reduces costs.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and relates to an engineering vehicle, specifically, to a lifting mechanism for adjusting the height of the cab of an engineering vehicle. Background Technology

[0002] Wheeled excavators (referred to as wheeled excavators) are a type of engineering machinery that uses tires as its walking mechanism. They are mainly used for earthmoving, material loading, and short-distance transportation. Compared with tracked excavators, they have the characteristics of high mobility, low ground pressure, and multi-functionality. They are often used in application scenarios such as jungles, roads, and mines.

[0003] Due to the specific application scenarios of wheeled excavators, the operator's view is often obstructed by obstacles, affecting normal operation. To solve this problem, many wheeled excavators now feature a cab lifting function, raising the entire cab to expand the operator's field of vision and ensure normal operation.

[0004] like Figure 1 As shown, the existing wheeled excavator's frame mainly consists of a central support 1 and skirts 2 located on the left and right sides of the central support 1. The cab is located on one side of the skirt 2, and its lifting is controlled by a lifting mechanism 3. In the prior art, the lifting mechanism 3 is fixed to the central support 1 by mounting brackets 4. The mounting brackets 4 are usually designed as cylinders, with two axially opposite end faces extending outward to form large annular mounting surfaces. One is mounted on the central support 1, and the other is mounted on the side of the lifting mechanism 3. This assembly method not only requires precision machining of the two large annular mounting surfaces of the mounting brackets 4 to increase the contact area and improve the connection strength, but also makes assembly difficult, time-consuming, and labor-intensive. At the same time, the lifting mechanism 3 generates a torque force on the mounting brackets 4 during operation, which deteriorates the mechanical properties of the mounting brackets 4.

[0005] In addition, the existing lifting mechanism 3 is usually equipped with two hydraulic cylinders 5 on the left and right sides, which jointly drive the lifting arm to rise and fall. This not only results in high hardware costs, but also requires two sets of oil circuits to supply oil to the two hydraulic cylinders 5 respectively. The large number of pipelines increases the design difficulty of hydraulic oil pipelines on wheeled excavators.

[0006] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0007] This utility model addresses at least one of the aforementioned technical problems in the prior art by proposing a cab lifting mechanism. By changing the installation position of the rear support and the frame, the mechanical performance is improved; by reducing the number of telescopic cylinders used, the structure is simplified and the cost is reduced.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] In one aspect, this utility model proposes a cab lifting mechanism, comprising:

[0010] Mounting base, which is used for mounting on the vehicle frame;

[0011] The rear support is located above the mounting base, with its bottom fitted onto the mounting base and its top facing upwards away from the mounting base.

[0012] A cab base, which is installed on the bottom of the cab to support the cab during lifting;

[0013] The lifting arm has a first end and a second end that are positioned opposite each other. The first end is rotatably assembled to the top of the rear support, and the second end is rotatably assembled to the cab base.

[0014] A telescopic cylinder is rotatably mounted between the rear support and the lifting arm, with the mounting point located at the center of the width direction of the rear support and the lifting arm, for driving the lifting arm to rise and fall.

[0015] The connecting rod has a first end and a second end that are positioned opposite each other. The first end of the connecting rod is rotatably assembled with the top of the rear support, and the second end of the connecting rod is rotatably assembled with the cab base. The connecting rod, the lifting arm, the rear support, and the cab base form a parallelogram linkage mechanism to control the cab base to maintain a horizontal state and move up and down.

[0016] In some embodiments of this application, since the mounting base adopts a bottom-bearing mounting method relative to the rear support, the structure of the mounting base can be simplified, including a top plate and a surrounding plate located below the top plate. The surrounding plate is mounted on the vehicle frame, and an opening is made in the middle area of ​​the top plate. For the lower-connected mounting base, a base plate can be provided at the bottom of the rear support, with an opening in the middle area of ​​the base plate, and an axle seat is provided below the base plate. The base plate is mounted on the top plate of the mounting base, and the axle seat is positioned below the top plate through the opening of the top plate. The bottom of the telescopic cylinder is rotatably assembled with the axle seat through the opening of the bottom plate of the rear support. By adjusting the main stress point of the telescopic cylinder to the bottom of the rear support, the stability of the rear support during the lifting process of the telescopic cylinder can be improved.

[0017] In some embodiments of this application, in order to keep the vehicle's appearance as simple as possible, a left side plate, a right side plate, and a rear baffle can be provided in the rear support; the left side plate and the right side plate are spaced apart, the bottom is fixed to the base plate of the rear support, the top is rotatably assembled with the lifting arm and the connecting rod, and the rear is connected to the rear baffle; the left side plate, the right side plate, and the rear baffle form a receiving area to accommodate the telescopic cylinder and the connecting rod after it has fallen back, thus shielding the telescopic cylinder and the connecting rod.

[0018] In some embodiments of this application, a front end plate can also be provided within the receiving area. The top of the front end plate is arranged at an angle relative to its bottom towards the rear baffle to leave sufficient space to accommodate the retracted connecting rod. The bottom of the front end plate is mounted on the base plate of the rear support, and the top of the front end plate is mounted on the rear baffle of the rear support. The left and right sides of the front end plate can respectively abut against the left and right side plates to provide support for them. A strip-shaped opening extending along the height direction can be provided on the front end plate for the telescopic cylinder to pass through. Providing a front end plate in the receiving area can limit the retraction position of the connecting rod and the lifting arm, preventing the connecting rod from contacting the telescopic cylinder and protecting it.

[0019] In some embodiments of this application, in order to improve the support strength of the lifting arm, the lifting arm can be designed as a long strip, with the first end and the second end of the lifting arm on opposite sides in the length direction. The first end and the second end can be designed as cylindrical shafts, which can be rotatably assembled with the rear support and the cab base through rotating shafts, respectively, to improve the assembly strength.

[0020] In some embodiments of this application, a triangular articulation frame can be installed on the inner side of the lifting arm facing the telescopic cylinder. The installation position of the articulation frame on the lifting arm can be determined according to the required maximum lifting height of the cab. The top of the telescopic cylinder is rotatably assembled with the articulation frame. The push and pull force applied to the lifting arm by the telescopic cylinder is distributed through the articulation frame and then transmitted to the lifting arm, which can increase the force-bearing area of ​​the lifting arm and ensure the connection strength.

[0021] In some embodiments of this application, the mounting position of the connecting rod on the rear support and the cab base can be configured to be below the mounting position of the lifting arm on the rear support and the cab base, so as to make the appearance simple.

[0022] In some embodiments of this application, to increase the supporting strength of the connecting rod, the connecting rod can be designed as a quadrilateral frame structure, with the top of the telescopic cylinder passing through the central area enclosed by the quadrilateral frame and then assembled to the lifting arm. The two opposite sides along the length of the connecting rod are the first and second ends, which can be designed as cylindrical shafts, rotatably assembled to the rear support and the cab base respectively via pivots, thereby improving assembly strength.

[0023] In some embodiments of this application, a bracket and a connecting frame can be provided in the cab base; wherein, in order to reduce the lifting weight, the bracket can be designed as a frame structure, horizontally arranged, for installation on the bottom surface of the cab; the connecting frame is connected to the rear of the bracket, forming an angle of 90°~120° with the bracket, so as to facilitate the positioning and installation of the cab on the bracket; the width of the connecting frame is configured to match the width of the lifting arm and the connecting rod, and forms a rotating connection with the lifting arm and the connecting rod respectively through a pivot to form a rotating connection with both ends for support assembly, so as to improve the assembly strength.

[0024] In another aspect, this utility model also proposes a wheeled excavator, including a frame, a cab, and a cab lifting mechanism. The frame includes a central support and skirts located on the left and right sides of the central support. The cab lifting mechanism is mounted on the left or right skirt and includes a mounting base, a rear support, a cab base, a lifting arm, a telescopic cylinder, and a connecting rod. The mounting base is mounted on the left or right skirt. The rear support is located above the mounting base, with its bottom fitted onto the mounting base and its top facing upwards away from the mounting base. The cab base is mounted on the bottom surface of the cab to support the cab's lifting and lowering. The lifting arm has a positioning... A first end and a second end are positioned opposite each other. The first end is rotatably assembled to the top of the rear support, and the second end is rotatably assembled to the cab base. A telescopic cylinder is rotatably installed between the rear support and the lifting arm, with the installation point located at the center of the width direction of the rear support and the lifting arm, for driving the lifting arm to rise and fall. A connecting rod has a first end and a second end positioned opposite each other. The first end of the connecting rod is rotatably assembled to the top of the rear support, and the second end of the connecting rod is rotatably assembled to the cab base. The connecting rod, the lifting arm, the rear support, and the cab base are configured to form a parallelogram linkage mechanism to control the cab base to maintain a horizontal state and rise and fall.

[0025] Compared with the prior art, the advantages and positive effects of this utility model are mainly reflected in:

[0026] 1. This utility model replaces the existing mounting bracket with a mounting base, and adjusts the mounting position from the side of the rear bracket to the bottom surface of the rear bracket. On the one hand, this simplifies the structural design and manufacturing process of the mounting base, reducing costs; on the other hand, it reduces the difficulty of splicing and assembling the rear bracket and the mounting base, improving installation efficiency. Simultaneously, the lifting mechanism does not generate torque on the mounting base during operation, thereby improving the mechanical properties of the mounting base and increasing its load-bearing capacity.

[0027] 2. This utility model reduces the number of telescopic cylinders used from two to one, which not only reduces costs, but also reduces the number of oil circuits and simplifies the layout design of oil pipelines for lifting mechanisms using hydraulic cylinders.

[0028] 3. Applying the lifting mechanism of this utility model to a wheeled excavator can raise the entire cab of the wheeled excavator to broaden the operator's working field of vision. Especially when there are obstacles in front of the excavator, by raising the height of the cab and extending it forward a certain distance, the operator can see the work object in front of the obstacle, thereby reducing the error rate and improving work efficiency and operational safety.

[0029] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0031] Figure 1 This is a structural schematic diagram of an embodiment of an existing cab lifting mechanism applied to a wheeled excavator;

[0032] Figure 2 This is a schematic diagram of the installation structure of the cab lifting mechanism proposed in this utility model on the frame of a wheeled excavator;

[0033] Figure 3 yes Figure 2 A schematic diagram of the cab lifting mechanism in the lowered state.

[0034] Figure 4 This is a schematic diagram of the overall structure of one embodiment of the cab lifting mechanism proposed in this utility model;

[0035] Figure 5 yes Figure 4A schematic diagram of the overall structure of the cab lifting mechanism from another perspective;

[0036] Figure 6 yes Figure 5 The diagram shown illustrates the structure of the cab lifting mechanism after the mounting base has been removed.

[0037] Figure 7 yes Figure 6 The diagram shown illustrates the structure of the cab lifting mechanism after the front end plate in the rear support has been removed.

[0038] Figure 8 yes Figure 6 The side view of the cab lifting mechanism shown;

[0039] Figure 9 yes Figure 7 The diagram shows the structure of the cab lifting mechanism after the connecting rods have been removed.

[0040] Figure 10 yes Figure 7 A schematic diagram of a structural embodiment of the connecting rod in the diagram;

[0041] Figure 11 yes Figure 7 A schematic diagram of one embodiment of the telescopic cylinder.

[0042] In the diagram, 1. Central support; 2. Skirt frame; 3. Lifting mechanism; 4. Mounting support; 5. Hydraulic cylinder; 6. Cab lifting mechanism; 100. Mounting base; 110. Top plate; 120. Surrounding panel; 200. Rear support; 210. Bottom plate; 211. Mounting hole; 212. Opening; 213. Shaft seat; 220. Left side plate; 221. Rotary connection point; 222. Bearing; 230. Right side plate; 240. Rear baffle; 250. Front plate; 251. Strip opening; 260. Handle; 300, Lifting arm; 310, First end of lifting arm; 320, Inner side; 330, Triangular hinge frame; 340, Pin; 400, Connecting rod; 410, First end of connecting rod; 420, Second end of connecting rod; 500, Cab base; 510, Bracket; 520, Connecting frame; 521, Side plate; 522, Side plate; 523, Transverse support plate; 524, Bearing; 525, Bearing; 600, Telescopic cylinder; 610, Piston rod; 620, Connecting ring; 630, Connecting ring. Detailed Implementation

[0043] 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 a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0044] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "front", "rear", "top", "bottom", 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, be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or internal communication within components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0046] Combination Figures 2 to 5 As shown, the cab lifting mechanism 6 in this embodiment mainly includes components such as mounting base 100, rear support 200, lifting arm 300, connecting rod 400, cab base 500, and telescopic cylinder 600.

[0047] The mounting base 100, serving as the connecting component between the entire cab lifting mechanism 6 and the vehicle frame, can be designed as a box structure with an opening, combined with... Figure 4 , Figure 5 As shown, it specifically includes a top plate 110 and a side plate 120. The top plate 110 can be designed as a rectangular flat plate, mounted on the top surface of the side plate 120, for connecting the rear support 200. An opening can be formed in the central area of ​​the top plate 110 to allow certain components of the rear support 200 to pass through. The side plate 120 can be arranged around the top plate 110 below it to support the top plate 110. The side plate 120 is mounted on the vehicle frame to enable the cab lifting mechanism 6 to be installed on the vehicle.

[0048] The rear support 200 and the mounting base 100 are assembled from top to bottom to solve the torque problem of the side assembly method in the prior art. This improves the stress problem of the mounting base 100 and simplifies the structural design and assembly operation of the mounting base 100.

[0049] In some embodiments, a base plate 210 may be provided at the bottom of the rear support 200, in conjunction with... Figure 6 , Figure 7 As shown, mounting holes 211 are provided on the base plate 210. The base plate 210 is threadedly connected to the top plate 110 of the mounting base 100 by bolts, so that the rear support 200 is located above the mounting base 100.

[0050] An opening 212 can be formed on the base plate 210 of the rear support 200, preferably in the central region of the base plate 210. A bearing 213 can be provided on the bottom surface of the base plate 210 below the opening 212 for rotatable assembly with the connecting ring 630 disposed at the bottom of the telescopic cylinder 600. Figure 7 , Figure 11 As shown.

[0051] The rear support 200 in this embodiment also includes main components such as a left side plate 220, a right side plate 230, a rear baffle 240, and a front end plate 250. The left side plate 220 and right side plate 230 are spaced apart from each other, with their bottoms mounted on the base plate 210 and their tops facing upwards away from the base plate 210, and are rotatably assembled with the lifting arm 300 and the connecting rod 400. The rear baffle 240 is connected to the rear of the left side plate 220 and right side plate 230, and the three together form a front-open receiving area for accommodating the telescopic cylinder 600 and the retracted lifting arm 300 and connecting rod 400.

[0052] The front panel 250 can be installed at an angle within the receiving area, such as... Figure 6 As shown. Specifically, the bottom of the front plate 250 can be mounted on the base plate 210 of the rear support 200, and the top of the front plate 250 can be tilted rearward to connect to the rear baffle 240. The front plate 250 divides the receiving area into two regions: the front region has a larger space to accommodate the lowered lifting arm 300 and connecting rod 400; the rear region has a smaller space to accommodate the telescopic cylinder 600. Separating the telescopic cylinder 600 from the lifting arm 300 and connecting rod 400 prevents the telescopic cylinder 600 from colliding with the connecting rod 400 or the lifting arm 300, thus protecting the telescopic cylinder 600.

[0053] A strip-shaped opening 251 extending along the height direction can be provided in the middle area of ​​the front baffle 250, through which the telescopic cylinder 600 passes and is then connected to the lifting arm 300.

[0054] The left and right sides of the front panel 250 can be abutted against the left side panel 220 and the right side panel 230 respectively to provide support for the left side panel 220 and the right side panel 230.

[0055] Handles 260 can be further installed on the outer surface of the left side panel 220 or the right side panel 230 to facilitate the overall handling and installation of the cab lifting mechanism 6. During daily operations, the driver can also easily climb the frame using the handles 260.

[0056] A rotating connection point 221 is provided at the top of the left side plate 220 and the right side plate 230 respectively for rotating assembly with the lifting arm 300.

[0057] In some embodiments, the lifting arm 300 can be designed as a long, strip-shaped plate structure, such as... Figure 9 As shown. The two opposite ends of the lifting arm 300 along its length are defined as the first end 310 and the second end of the lifting arm 300, respectively. The first end 310 of the lifting arm 300 is rotatably mounted on the top of the left side plate 220 and the right side plate 230, for example, mounted on the rotatable connection point 221. The second end is rotatably mounted on the cab base 500.

[0058] To improve the stability of the rotating assembly between the lifting arm 300 and the rear support 200, the first end 310 of the lifting arm 300 can be designed as a cylindrical shaft, and bearings can be installed at the rotation connection points 221 on the left side plate 220 and the right side plate 230 of the rear support 200. A rotating shaft is inserted into the shaft at the first end 310 of the lifting arm 300, and both ends of the rotating shaft are installed in the bearings on the left side plate 220 and the right side plate 230 of the rear support 200, allowing the lifting arm 300 to swing up and down relative to the rear support 200. Compared with point assembly, the rotating shaft assembly method provides stronger support and a more stable assembly effect.

[0059] The top of the telescopic cylinder 600 (e.g., the top of the piston rod 610, such as...) Figure 11 (As shown) is rotatably assembled with the lifting arm 300, and the lifting arm 300 is driven to rise or fall by the telescopic cylinder 600.

[0060] To reduce hardware costs and design complexity, this embodiment uses only one telescopic cylinder 600 in the lifting mechanism. The connection point between the telescopic cylinder 600 and the lifting arm 300 is positioned at the center of the width of the lifting arm 300 to improve the stability of the lifting process.

[0061] In some embodiments, the side of the elongated lifting arm 300 facing the telescopic cylinder 600 is defined as its inner side surface 320, such as... Figure 9As shown, two triangular hinge brackets 330 are installed on the inner side 320. The triangular hinge brackets 330 are rotated and assembled with the top of the telescopic cylinder 600 to increase the force-bearing area of ​​the lifting arm 300, so that the lifting arm 300 can withstand a greater upward thrust.

[0062] Specifically, two triangular hinge brackets 330 can be arranged side by side with a gap between them, and the straight sides are fixedly installed on the inner side 320 of the lifting arm 300. Pin holes are formed at the apex corners of the two triangular hinge brackets 330, and a connecting ring 620 is arranged at the top of the piston rod 610 of the telescopic cylinder 600. Figure 11 As shown, the connecting ring 620 is installed between the pin holes of the two triangular hinge brackets 330, as... Figure 9 As shown, it is assembled by rotating the pin 340.

[0063] In actual use, the distance L from the connecting ring 620 of the telescopic cylinder 600 to the first end 310 of the lifting arm 300 can be determined according to the maximum lifting height required by the vehicle cab. By adjusting the distance L, the maximum lifting height of the cab can be adjusted to meet different usage requirements.

[0064] The second end of the lifting arm 300 is rotatably mounted on the cab base 500. The lifting arm 600 is driven to rise or fall by the telescopic cylinder 600, which in turn drives the cab base 500 to rise or fall.

[0065] To improve the reliability of the assembly between the lifting arm 300 and the cab base 500, the second end of the lifting arm 300 can be designed as a cylinder, that is, a shaft cylinder can be formed. A rotating shaft can be inserted into the shaft cylinder, and the two ends of the rotating shaft can be rotated and assembled with the cab base 500 respectively to obtain a more stable assembly effect.

[0066] Specifically, in this embodiment, a bracket 510 and a connecting bracket 520 are provided in the cab base 500, combined with Figure 8 , Figure 9 As shown. The bracket 510 is horizontally positioned and installed on the bottom of the cab to support its lifting and lowering. The connecting frame 520 is installed behind the bracket 510, forming an angle α of 90°~120° with the bracket 510, and is rotatably assembled with the second end of the lifting arm 300 via the connecting frame 520.

[0067] In some embodiments, left and right side plates 521 and 522 can be provided in the connecting frame 520, and a transverse support plate 523 can be connected between the two side plates 521 and 522. The distance between the left and right side plates 521 and 522 is configured to match the width of the second end of the lifting arm 300, and a bearing 524 is installed at a position slightly above the left and right side plates 521 and 522 respectively. The two ends of the rotating shaft passing through the shaft sleeve at the second end of the lifting arm 300 are correspondingly installed in the bearings 524 on the left and right side plates 521 and 522 to realize the rotational assembly between the lifting arm 300 and the connecting frame 520.

[0068] In this embodiment, the connecting frame 520 and the bracket 510 are configured to form an angle α greater than 90°. This allows for more operating space for the operator when the cab is installed on the bracket 510, thereby reducing the difficulty of positioning and installing the cab on the bracket 510.

[0069] To ensure the cab remains level during lifting and lowering, this embodiment further includes a connecting rod 400 rotatably connected between the rear support 200 and the cab base 500. Figure 7 , Figure 8 As shown. The connecting rod 400 is configured to form a parallelogram linkage mechanism with the lifting arm 300, the rear support 200, and the cab base 500 to control the bracket 510 in the cab base 500 to only lift and lower without tilting.

[0070] In some embodiments, the connecting rod 400 may be positioned below the lifting arm 300 and parallel to the lifting arm 300.

[0071] Specifically, the connecting rod 400 in this embodiment can be designed as a quadrilateral frame structure, such as... Figure 10 As shown, the central area is hollowed out to allow the top of the telescopic cylinder 600 to pass through and connect to the lifting arm 300. The width of the connecting rod 400 is equal to the width of the lifting arm 300, and the two opposite sides along the length of the connecting rod 400 are defined as the first end 410 and the second end 420, respectively. The first end 410 of the connecting rod 400 is rotatably mounted on the top of the rear support 200 and located below the first end 310 of the lifting arm 300, and the second end 420 of the connecting rod 400 is rotatably mounted on the connecting bracket 520 of the cab base 500 and located below the second end of the lifting arm 300.

[0072] To improve the stability and reliability of the rotating assembly between the connecting rod 400, the rear support 200, and the cab base 500, the first end 410 and the second end 420 of the connecting rod 400 can be designed as cylindrical, i.e., forming a shaft cylinder. Furthermore, bearings 222 are installed on the left side plate 220 and the right side plate 230 of the rear support 200, respectively, below the rotating connection point 221. Figure 7 As shown. A rotating shaft is installed in the cylinder formed by the first end 410 of the connecting rod 400. The two ends of the rotating shaft are connected to bearings 222 on the left side plate 220 and the right side plate 230 of the rear support 200, respectively, so that the connecting rod 400 can rotate relative to the rear support 200. Similarly, two bearings 525 are installed on the left and right side plates 521 and 522 of the connecting frame 520, respectively, below the bearing 524. Figure 8 As shown, a rotating shaft is installed in the cylinder formed by the second end 420 of the connecting rod 400, and the two ends of the rotating shaft are respectively connected to the bearings 525 on the left and right side plates 521 and 522 of the connecting frame 520 to realize the rotational assembly between the connecting rod 400 and the cab base 500.

[0073] In this embodiment, the connecting rod 400 is designed as a frame structure, which provides greater support strength compared to the two long rods used in the prior art, and the resulting parallelogram linkage mechanism is more stable.

[0074] Furthermore, to reduce the lifting weight of the lifting boom 300 and connecting rod 400, the bracket 510 of the cab base 500 can be designed as a frame structure, such as... Figure 7 As shown, while ensuring the load-bearing requirements of the cab, the overall weight of the cab base 500 can be reduced.

[0075] Industrial applicability

[0076] The cab lifting mechanism 6 of this embodiment is installed on a wheeled excavator for raising and lowering the cab of the wheeled excavator. Since the wheeled excavator is equipped with hydraulic oil lines, the telescopic cylinder 600 in the cab lifting mechanism 6 can be a hydraulic cylinder. Pipelines are configured to lead the hydraulic oil in the hydraulic oil lines to the hydraulic cylinder to control the extension or retraction of the piston rod in the hydraulic cylinder.

[0077] like Figure 2 As shown, the cab of a wheeled excavator is generally installed on the left side skirt 2 (the left side here refers to the left side with the driver as the reference, not the left side shown in the attached figure). The cab lifting mechanism 6 of this embodiment is installed on the left side skirt 2 of the wheeled excavator, and the bottom surface of the cab is installed on the bracket 510 of the cab base 500.

[0078] When the driver is operating the wheeled excavator, if an obstacle appears in front and obstructs the driver's view, the driver can control the hydraulic cylinder through the control panel to extend its piston rod, push the lifting arm 300 to lift, and then drive the connecting rod 400 to lift simultaneously. The cab base 500 rises, and the cab is supported by the bracket 510, so that the cab is raised and kept in a horizontal position and moved slightly backward.

[0079] After the cab is raised, the driver can control the hydraulic cylinder to stop operating at any time depending on the height of the obstacle, so as to maintain a suitable height for continued operation.

[0080] After the operation is completed, the operator can control the hydraulic cylinder to retract its piston rod via the control panel, thereby causing the lifting arm 300 and connecting rod 400 to fall synchronously, and the cab base 500 to descend, supporting the cab as it falls horizontally. When the connecting rod 400 falls to the position of the front end plate 250 of the rear support 200, it has reached its final position. Figure 3 As shown, the driver can either continue driving the wheeled excavator or get off the vehicle.

[0081] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the 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; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A cab lifting mechanism, characterized by, include: Mounting base, which is used for mounting on the vehicle frame; The rear support is located above the mounting base, with its bottom fitted onto the mounting base and its top facing upwards away from the mounting base. A cab base, which is installed on the bottom of the cab to support the cab during lifting; The lifting arm has a first end and a second end that are positioned opposite each other. The first end is rotatably assembled to the top of the rear support, and the second end is rotatably assembled to the cab base. A telescopic cylinder is rotatably mounted between the rear support and the lifting arm, with the mounting point located at the center of the width direction of the rear support and the lifting arm, for driving the lifting arm to rise and fall. The connecting rod has a first end and a second end that are positioned opposite each other. The first end of the connecting rod is rotatably assembled with the top of the rear support, and the second end of the connecting rod is rotatably assembled with the cab base. The connecting rod, the lifting arm, the rear support, and the cab base form a parallelogram linkage mechanism to control the cab base to maintain a horizontal state and move up and down.

2. The cab lifting mechanism according to claim 1, characterized in that, The mounting base includes a top plate and a surrounding plate located below the top plate. The surrounding plate is mounted on the vehicle frame, and an opening is formed in the middle area of ​​the top plate. The rear support is provided with a base plate at the bottom, with an opening in the middle area of ​​the base plate, and a bearing seat is provided below the base plate; The base plate is mounted on the top plate of the mounting base, and the bearing seat is positioned below the top plate through an opening in the top plate; The bottom of the telescopic cylinder passes through the bottom plate opening of the rear support and is rotatably assembled with the bearing.

3. A cab lifting mechanism according to claim 2, characterised in that The rear support includes a left side plate, a right side plate, and a rear baffle. The left side plate and the right side plate are spaced apart, with their bottoms fixed to the base plate of the rear support, their tops rotatably assembled with the lifting arm and connecting rod, and their rear ends connected to the rear baffle. The left side plate, the right side plate, and the rear baffle form a receiving area for accommodating the telescopic cylinder and the connecting rod and lifting arm after they have retracted.

4. A cab lifting mechanism according to claim 3, characterised in that A front end plate is provided within the receiving area. The top of the front end plate is inclined toward the rear baffle relative to its bottom. The bottom of the front end plate is installed on the base plate of the rear support, and the top of the front end plate is installed on the rear baffle of the rear support. The left and right sides of the front end plate abut against the left and right side plates respectively. A strip-shaped opening extending along the height direction is provided on the front end plate for the telescopic cylinder to pass through.

5. The cab lifting mechanism according to any one of claims 1 to 4, characterized in that The lifting arm is a long strip, with the first and second ends of the lifting arm on opposite sides along its length. The first and second ends form cylindrical shafts, which are rotatably assembled with the rear support and the cab base via rotating shafts, respectively.

6. A cab lifting mechanism according to claim 5, characterised in that A triangular articulation frame is installed on the inner side of the lifting arm facing the telescopic cylinder. The installation position of the articulation frame on the lifting arm is determined according to the required maximum lifting height of the cab. The top of the telescopic cylinder is rotatably assembled with the articulation frame.

7. A cab lifting mechanism according to any one of claims 1 to 4, characterised in that, The mounting position of the connecting rod on the rear support and the cab base is located below the mounting position of the lifting arm on the rear support and the cab base.

8. A cab lifting mechanism according to claim 7, characterised in that The connecting rod has a quadrilateral frame structure. The top of the telescopic cylinder passes through the middle area enclosed by the quadrilateral frame and is then assembled to the lifting arm. The two opposite sides of the connecting rod along its length are the first end and the second end of the connecting rod. The first end and the second end of the connecting rod form a cylindrical shaft, which is rotatably assembled to the rear support and the cab base through a rotating shaft, respectively.

9. A cab lifting mechanism according to any one of claims 1 to 4, characterised in that, The cab base includes: The bracket, which is a frame structure, is horizontally set and is used to install on the bottom of the cab; A connecting frame is attached to the rear of the bracket, forming an angle of 90° to 120° with the bracket; the width of the connecting frame is adapted to the width of the lifting arm and the connecting rod, and is respectively connected to the lifting arm and the connecting rod through a pivot to form a rotating connection with both ends for support assembly.

10. A wheel excavator comprising a vehicle body and a cab, the vehicle body comprising a center frame and skirt frames on both left and right sides of the center frame; characterized in that, A cab lifting mechanism as described in any one of claims 1 to 9 is installed on the left or right side skirt, and the cab is mounted on the cab base of the cab lifting mechanism.

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