Excavator main platform rotation limiting device

Abstract

The utility model provides an excavator main platform rotation limiting device which comprises a lower frame, an upper frame and a slewing bearing, the lower frame is movably connected with the upper frame through the slewing bearing, a rotation limiting mechanism is arranged on the lower frame and the upper frame, the rotation limiting mechanism comprises a buffering assembly and a limiting assembly, the buffering assembly is arranged on one side of the bottom of the upper frame, and the limiting assembly is arranged on one side of the bottom of the upper frame. The rotation limiting mechanism is arranged on the upper frame and the lower frame, the rotation limiting mechanism comprises the buffering assembly and the limiting assembly, the limiting function of rotation of the excavator main platform is automatically operated, and lifting of the excavator main platform is achieved through the limiting assembly. The limiting assembly is flush with the buffering assembly in the ascending process, the limiting assembly plays a role in limiting rotation in the process that the buffering assembly rotates along with the upper frame, the limiting assembly is located at the bottom of the buffering assembly in the descending process, rotation of the buffering assembly is not limited any more, the excavator main platform can recover to rotate by 360 degrees, and the operation convenience and the use effect are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a rotation limiting device for a main platform of an excavator. Background Art

[0002] Excavators and other construction machinery are widely used in mining, construction, transportation and other engineering construction. In engineering construction, the working environment is complex and changeable. For example, in some special working environments with limited space, the rotation angle of excavators and other construction machinery is limited during operation. Operators need to accurately control their rotation angle to prevent the excavators and other construction machinery from rotating too much during operation, causing collisions between the excavators and the surroundings, thereby damaging the machine and affecting the service life of the excavators.

[0003] The prior art discloses a slewing limit mechanism (publication number: CN209277227U), which includes an upper frame, a slewing support and a lower frame, wherein the upper frame is movably connected to the lower frame through the slewing support, a stopper is fixedly installed on the upper frame, and a limit block is fixedly installed on the lower frame. The utility model is used to limit the slewing angle of construction machinery such as excavators.

[0004] However, the above technical solution and the prior art still have the following defects: during use, the slewing limit device needs to be manually disassembled and assembled before the excavator is used with or without slewing limit, which causes frequent disassembly and assembly during use and increases manual operation time, thereby reducing the convenience of operation and the use effect. Utility Model Content

[0005] The purpose of the utility model is to provide a rotation limiting device for the main platform of an excavator to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A slewing limit device for an excavator main platform comprises a lower frame, an upper frame and a slewing bearing, wherein the lower frame is movably connected to the upper frame via a slewing bearing, and slewing limit mechanisms are arranged on the lower frame and the upper frame, and the slewing limit mechanisms are used to limit the rotation angle of the excavator main platform, and the slewing limit mechanism comprises a buffer assembly and a limit assembly, wherein the buffer assembly is arranged on one side of the bottom of the upper frame, and the limit assembly is arranged on the other side of the top of the lower frame, and the limit assembly is arranged for lifting inside the frame body of the lower frame, so as to realize slewing limit in cooperation with the buffer assembly through automatic lifting adjustment, thereby improving the convenience of operation.

[0008] Preferably, the buffer assembly includes a mounting seat, a mounting cavity, a first arc-shaped plate, a first mounting hole, and a second mounting hole. The mounting seat is fixedly mounted on one side of the bottom of the upper frame, and a mounting cavity is opened at the center of the interior of the mounting seat. The mounting cavity is adapted to the first arc-shaped plate, and first mounting holes and second mounting holes are respectively opened on both sides of the mounting cavity and on the first arc-shaped plate. The first mounting hole and the second mounting hole are fixed by bolts.

[0009] Preferably, the buffer assembly further includes a side plate and a buffer, wherein the side plate is arranged at both ends of the first arc-shaped plate, and one side of the side plate is in contact with both ends of the mounting seat, and the buffer is arranged on the other side of the side plate.

[0010] Preferably, the limiting assembly includes a servo motor, a first bevel gear, a second bevel gear, a lifting screw and a rotating shaft. The servo motor is arranged inside the frame of the lower frame, and the output end of the servo motor is fixedly installed with the first bevel gear. The first bevel gear is meshedly connected with the second bevel gear arranged at the bottom end of the lifting screw. The bottom end of the lifting screw is rotatably connected to the rotating shaft, and the rotating shaft is fixedly installed inside the frame of the lower frame.

[0011] Preferably, the limiting assembly also includes a threaded barrel, a lifting plate, a second arc-shaped plate, an L-shaped plate and a sliding rod, the interior of the threaded barrel is threadedly connected to the lifting screw, and the threaded barrel is fixedly installed at the center of the lifting plate, the top surface of the lifting plate is fixedly installed with the second arc-shaped plate, and L-shaped plates are arranged on both sides of the lifting plate, the bottom end of the L-shaped plate is slidably connected to the sliding rod, and the sliding rod is fixedly installed inside the lower frame body.

[0012] Preferably, a lifting groove is provided in the upper part of the interior of the lower frame body, and the lifting groove is slidably connected to the outer side of the L-shaped plate for lifting and lowering the lifting plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By arranging a slewing limit mechanism on the upper frame and the lower frame, the slewing limit mechanism includes a buffer assembly and a limit assembly, so as to realize the limit function of the slewing of the main platform of the excavator in the automated operation, and utilize the limit assembly to realize its own lifting and lowering. When rising, the limit assembly is flush with the buffer assembly, and plays the function of limiting the rotation of the buffer assembly as the upper frame rotates. When descending, the limit assembly is located at the bottom of the buffer assembly, and the rotation of the buffer assembly is no longer restricted, so that the main platform of the excavator can be restored to rotate 360°, thereby improving the convenience of operation and the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2This is a schematic diagram of the structure of the buffer component of the utility model.

[0017] Figure 3 It is a schematic diagram of the main structure of the lower frame of the utility model.

[0018] Figure 4 It is a schematic diagram of the structure of the limit assembly of the utility model.

[0019] In the figure: 1, lower frame; 2, upper frame; 3, slewing bearing; 4, buffer assembly; 401, mounting seat; 402, mounting cavity; 403, first arc plate; 404, side plate; 405, buffer; 406, first mounting hole; 407, second mounting hole; 5, limit assembly; 501, servo motor; 502, first bevel gear; 503, second bevel gear; 504, lifting screw; 505, rotating shaft; 506, threaded barrel; 507, lifting plate; 508, second arc plate; 509, L-shaped plate; 510, slide rod; 6, lifting slot. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4 , the utility model provides a technical solution:

[0022] Embodiment 1:

[0023] A slewing limit device for an excavator main platform comprises a lower frame 1, an upper frame 2 and a slewing bearing 3. The lower frame 1 is movably connected to the upper frame 2 through the slewing bearing 3. A slewing limit mechanism is arranged on the lower frame 1 and the upper frame 2. The slewing limit mechanism is used to limit the rotation angle of the excavator main platform. The slewing limit mechanism comprises a buffer component 4 and a limit component 5. The buffer component 4 is arranged on one side of the bottom of the upper frame 2, and the limit component 5 is arranged on the other side of the top of the lower frame 1. The limit component 5 is arranged in the internal lifting and lowering arrangement of the frame body of the lower frame 1, so as to realize the slewing limit through the cooperation between the automatic lifting and lowering adjustment and the buffer component 4, thereby improving the convenience of operation.

[0024] The buffer assembly 4 includes a mounting seat 401, a mounting cavity 402, a first curved plate 403, a first mounting hole 406 and a second mounting hole 407. The mounting seat 401 is fixedly installed on one side of the bottom of the upper frame 2, and a mounting cavity 402 is opened in the center of the mounting seat 401. The mounting cavity 402 is adapted to the first curved plate 403. The first mounting holes 406 and the second mounting holes 407 are opened on both sides of the mounting cavity 402 and on the first curved plate 403 respectively. The first mounting holes 406 and the second mounting holes 407 are fixed by bolts. The buffer assembly 4 also includes side panels 404 and buffers 405. The side panels 404 are arranged at both ends of the first curved plate 403, and one side of the side panels 404 is in contact with both ends of the mounting seat 401. The buffers 405 are arranged on the other side of the side panels 404, and rubber pads are arranged on the outside of the buffers 405.

[0025] By setting a buffer component 4 on one side of the bottom of the upper frame 2, the upper frame 2 can be brought into contact with the limit component 5 on the other side of the lower frame 1 during rotation, thereby achieving the function of rotational limit. By setting the installation cavity 402, the first curved plate 403 and the side plate 404, the first curved plate 403 can be fixedly installed in the installation cavity 402 of the mounting seat 401 by bolts, and the side plates 404 at both ends of the first curved plate 403 are located at both ends of the mounting seat 401 and fit with both ends of the mounting seat 401, which is convenient for disassembly and assembly. In the process of the buffer 405 colliding with the limit component 5, the buffer 405 transmits the force to the mounting seat 401 through the side plate 404, effectively avoiding directly transmitting the force to the bolt, which may cause deformation of the bolt and affect the reliability and safety of the connection.

[0026] The limiting assembly 5 includes a servo motor 501, a first bevel gear 502, a second bevel gear 503, a lifting screw 504 and a rotating shaft 505. The servo motor 501 is arranged inside the frame of the lower frame 1, and the first bevel gear 502 is fixedly installed on the output end of the servo motor 501. The first bevel gear 502 is meshedly connected with the second bevel gear 503 arranged at the bottom end of the lifting screw 504. The bottom end of the lifting screw 504 is rotatably connected with the rotating shaft 505, and the rotating shaft 505 is fixedly installed inside the frame of the lower frame 1.

[0027] The limiting assembly 5 also includes a threaded barrel 506, a lifting plate 507, a second curved plate 508, an L-shaped plate 509 and a sliding rod 510. The interior of the threaded barrel 506 is threadedly connected to the lifting screw 504, and the threaded barrel 506 is fixedly installed at the center of the lifting plate 507. The second curved plate 508 is fixedly installed on the top surface of the lifting plate 507. Rubber pads are provided at both ends of the second curved plate 508 to play a buffering role in the process of contact with the buffer 405. L-shaped plates 509 are provided on both sides of the lifting plate 507. The bottom end of the L-shaped plate 509 is slidably connected to the sliding rod 510, and the sliding rod 510 is fixedly installed inside the lower frame 1.

[0028] A lifting groove 6 is provided in the upper part of the frame body of the lower frame 1 , and the lifting groove 6 is slidably connected to the outer side of the L-shaped plate 509 for lifting and lowering the lifting plate 507 .

[0029] By arranging a limit assembly 5 on the other side of the lower frame 1, the function of automatic lifting is realized. There is no need to disassemble the device during use and non-use, which improves the use effect. The first bevel gear 502 is driven by the servo motor 501 to rotate, and the second bevel gear 503 and the lifting screw 504 are driven to rotate through the second bevel gear 503. During the rotation of the lifting screw 504, the threaded cylinder 506 drives the lifting plate 507 to be lifted along the lifting screw 504, and the L-shaped plates 509 at both ends of the lifting plate 507 are lifted along the sliding rod 510, thereby improving the stability of the lifting plate 507 during the lifting process. When the lifting plate 507 drives the second curved plate 508 to rise, the second curved plate 508 and the first curved plate 508 are lifted. The arc plates 403 are on the same horizontal plane, so that when the upper frame 2 drives the buffer assembly 4 to rotate left and right through the slewing bearing 3, the buffer 405 will respectively hit the two ends of the second arc plate 508 to realize the slewing limit function. When the excavator does not need slewing limit, the servo motor 501 is used to drive the lifting plate 507 to descend, and the second arc plate 508 on the lifting plate 507 is lowered to the bottom of the first arc plate 403. When the upper frame 2 drives the buffer assembly 4 to rotate, the buffer assembly 4 can directly pass through the upper part of the second arc plate 508 to realize a 360° rotation of the excavator. When the slewing limit device is used or not, automatic adjustment is realized without the need for disassembly and assembly, thereby improving the use effect.

[0030] Working principle: When the excavator is working in an environment with limited space, the servo motor 501 is directly controlled to drive the second curved plate 508 to rise to the same horizontal plane as the first curved plate 403. At this time, the upper frame 2 can drive the buffer assembly 4 to rotate by limiting the buffer assembly 4 to realize the function of rotation limit. The buffers 405 at both ends of the first curved plate 403 contact with both ends of the second curved plate 508 to limit the rotation angle of the excavator; and when we do not need the excavator to limit the rotation, the servo motor 501 is driven again to drive the second curved plate 508 to descend into the lifting slot 6. At this time, the second curved plate 508 is located at the bottom of the first curved plate 403, so that the first curved plate 403 can freely pass through the upper part of the second curved plate 508. At this time, the excavator can resume 360° rotation, realize automated operation, and improve the convenience of operation.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slewing limit device for a main platform of an excavator, comprising a lower frame (1), an upper frame (2) and a slewing bearing (3), characterized in that: The lower frame (1) is movably connected to the upper frame (2) via a slewing bearing (3); a slewing limit mechanism is provided on the lower frame (1) and the upper frame (2); the slewing limit mechanism is used to limit the rotation angle of the main platform of the excavator; the slewing limit mechanism comprises a buffer component (4) and a limit component (5); the buffer component (4) is provided on one side of the bottom of the upper frame (2); the limit component (5) is provided on the other side of the top of the lower frame (1); and the limit component (5) is provided inside the frame body of the lower frame (1) for lifting and lowering, so as to realize automatic lifting and lowering adjustment and cooperate with the buffer component (4) to realize slewing limit, thereby improving the convenience of operation.

2. The excavator main platform rotation limiting device according to claim 1, characterized in that: The buffer assembly (4) comprises a mounting seat (401), a mounting cavity (402), a first arc-shaped plate (403), a first mounting hole (406) and a second mounting hole (407); the mounting seat (401) is fixedly mounted on one side of the bottom of the upper frame (2); a mounting cavity (402) is provided at the center of the interior of the mounting seat (401); the mounting cavity (402) is adapted to the first arc-shaped plate (403); the first mounting hole (406) and the second mounting hole (407) are respectively provided on both sides of the mounting cavity (402) and on the first arc-shaped plate (403); the first mounting hole (406) and the second mounting hole (407) are fixed by bolt connection.

3. The excavator main platform rotation limiting device according to claim 2 is characterized in that: The buffer assembly (4) further comprises a side plate (404) and a buffer (405), wherein the side plate (404) is arranged at both ends of the first arc-shaped plate (403), and one side of the side plate (404) is in contact with both ends of the mounting seat (401), and the buffer (405) is arranged at the other side of the side plate (404).

4. The excavator main platform rotation limiting device according to claim 1, characterized in that: The limiting assembly (5) comprises a servo motor (501), a first bevel gear (502), a second bevel gear (503), a lifting screw (504) and a rotating shaft (505); the servo motor (501) is arranged inside the frame of the lower frame (1); and the output end of the servo motor (501) is fixedly mounted with the first bevel gear (502); the first bevel gear (502) is meshingly connected with the second bevel gear (503) arranged at the bottom end of the lifting screw (504); the bottom end of the lifting screw (504) is rotatably connected with the rotating shaft (505); and the rotating shaft (505) is fixedly mounted inside the frame of the lower frame (1).

5. The excavator main platform rotation limiting device according to claim 4 is characterized in that: The limiting assembly (5) also includes a threaded barrel (506), a lifting plate (507), a second curved plate (508), an L-shaped plate (509) and a sliding rod (510); the interior of the threaded barrel (506) is threadedly connected to the lifting screw (504), and the threaded barrel (506) is fixedly installed at the center of the lifting plate (507); the second curved plate (508) is fixedly installed on the top surface of the lifting plate (507), and L-shaped plates (509) are arranged on both sides of the lifting plate (507); the bottom end of the L-shaped plate (509) is slidably connected to the sliding rod (510), and the sliding rod (510) is fixedly installed inside the frame of the lower frame (1).

6. The excavator main platform rotation limiting device according to claim 5, characterized in that: The upper part of the lower frame (1) is provided with a lifting groove (6), and the lifting groove (6) is slidably connected to the outer side of the L-shaped plate (509) and is used for lifting and lowering the lifting plate (507).

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