A telescopic excavator arm

Abstract

The utility model relates to a telescopic excavator stick, including outer stick and inner stick, outer stick rear end is connected with excavator movable arm, inner stick is located in the outer stick inside and is connected with outer stick sliding fit, and inner stick front end is from outer stick front end port and is connected with excavator bucket, and the inside between inner stick and outer stick is equipped with telescopic drive part that drives inner stick to retract along outer stick. Telescopic drive part includes transmission rack, worm wheel, worm and drive motor, and transmission rack is equipped in outer stick inner bottom, drive motor is equipped in inner stick rear end inside, drive motor output shaft is connected with worm through the joint, and worm wheel is located between worm and transmission rack, and worm wheel is engaged with worm and transmission rack simultaneously. The utility model adopts the outer stick and inner stick of sliding fit, and through telescopic drive part control inner stick telescopic, to this realizes the overall length of adjusting excavator stick, and the adjustment work of excavating range is conveniently flexible, improves the work adaptability of excavator.

Description

Technical Field

[0001] This utility model relates to a retractable excavator boom. Background Technology

[0002] The excavator boom is a device on an excavator used to connect the boom and the bucket, enabling control of the bucket's digging operations. However, existing telescopic excavator boom devices have two drawbacks. First, the boom's length cannot be adjusted as needed, thus limiting the range of digging operations and reducing the excavator's adaptability. Second, during operation, the inside of the boom is prone to overheating due to exposure to direct sunlight, which could compromise the safety of the electrical components, wiring, and piping within the boom. Therefore, improvements are necessary to address these technical issues. Utility Model Content

[0003] This utility model addresses the problems existing in the prior art by providing a telescopic excavator boom with a reasonable design that facilitates adjustment of the boom length.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a telescopic excavator boom, comprising an outer boom and an inner boom, both having a box-shaped structure. The rear end of the outer boom is used to connect with the excavator boom. The inner boom is disposed inside the outer boom and slides in cooperation with the outer boom in a forward and backward direction. The front end of the inner boom extends from the front end of the outer boom and is used to connect with the excavator bucket. A telescopic drive component is provided between the interior of the inner boom and the interior of the outer boom for driving the inner boom to extend and retract along the outer boom.

[0005] Furthermore, the telescopic drive component includes a transmission rack, a worm gear, a worm, and a drive motor. The transmission rack is installed at the inner bottom of the outer bucket and extends along the length of the outer bucket. The drive motor is installed inside the rear end of the inner bucket, and the output shaft of the drive motor extends rearward and is connected to the worm through a coupling. The worm gear is located between the worm and the transmission rack, and the worm gear meshes with both the worm and the transmission rack.

[0006] Furthermore, the bottom of the rear end of the inner bucket rod is provided with a bottom clearance slot to facilitate the passage of the worm gear and its engagement with the transmission rack.

[0007] Furthermore, the rear end of the bucket rod is provided with a pair of front and rear distributed worm gear mounting seats, with the worm gear positioned between the pair of worm gear mounting seats; below the pair of worm gear mounting seats is a pair of left and right distributed worm wheel mounting holes, with the worm wheel positioned between the pair of worm wheel mounting holes.

[0008] Furthermore, the inner bottom of the inner bucket rod is provided with a rack receiving groove, which extends along the length direction of the inner bucket rod; the transmission rack extends into the rack receiving groove and slides in cooperation with the rack receiving groove.

[0009] Furthermore, the bottom left and right ends of the outer bucket rod are each provided with a row of external heat dissipation holes, which are distributed along the length of the outer bucket rod; the bottom left and right ends of the inner bucket rod are each provided with a row of internal heat dissipation holes, which are distributed along the length of the inner bucket rod, and the positions of the internal heat dissipation holes correspond to those of the external heat dissipation holes.

[0010] Furthermore, a top clearance slot is provided at the middle position of the front end of the outer bucket rod; a pair of first connecting lugs are provided at the middle position of the front end of the inner bucket rod, the pair of first connecting lugs passing through the top clearance slot and used to connect with the bucket hydraulic cylinder.

[0011] Furthermore, an electrical wire hole is provided at the top center of the front end of the inner bucket rod. The electrical wire hole is located on the front side of a pair of first connecting ear plates and corresponds to the position of the top clearance slot.

[0012] Furthermore, the rear end of the outer boom is provided with a first hinge hole for hinged connection with the excavator boom, and the bottom of the rear end of the outer boom is provided with a pair of second connecting lugs for connection with the boom hydraulic cylinder.

[0013] Furthermore, the front end of the inner bucket rod is provided with a second hinge hole for hinged connection with the excavator bucket.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention has a reasonable structural design, adopts a sliding fit between the outer stick and the inner stick, and controls the extension and retraction of the inner stick through a telescopic drive component, thereby realizing the adjustment of the overall length of the excavator stick. It is convenient to use and facilitates flexible adjustment of the digging range, thereby improving the working adaptability of the excavator. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged diagram of point A in the diagram; Figure 4 This is a three-dimensional structural diagram of the inner bucket rod in an embodiment of this utility model; Figure 5 This is a schematic diagram of the internal structure of the inner bucket rod in an embodiment of this utility model; Figure 6This is a schematic diagram of the external structure of the inner bucket rod in an embodiment of this utility model; Figure 7 This is a schematic diagram of the internal structure of the outer bucket rod in an embodiment of this utility model; Figure 8 This is a schematic diagram of the external structure of the outer bucket pole in an embodiment of this utility model. Figure 1 ; Figure 9 This is a schematic diagram of the external structure of the outer bucket pole in an embodiment of this utility model. Figure 2 .

[0016] In the picture: 1-Outer stick; 2-Inner stick; 3-Telescopic drive component; 4-Transmission rack; 5-Worm wheel; 6-Worm; 7-Drive motor; 8-Bottom clearance slot; 9-Worm mounting base; 10-Worm wheel mounting hole; 11-Motor mounting base; 12-Rack receiving slot; 13-Outer heat dissipation hole; 14-Inner heat dissipation hole; 15-Top clearance slot; 16-First connecting lug; 17-Bucket hydraulic cylinder; 18-Electrical cable hole; 19-First hinge hole; 20-Second connecting lug; 21-Second hinge hole; 22-Coupling. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] like Figures 1-9 As shown, this utility model discloses a telescopic excavator boom, suitable for connecting the excavator boom and bucket. It includes an outer boom 1 and an inner boom 2, both with a box-shaped cross-section. The rear end of the outer boom 1 connects to the excavator boom. The inner boom 2 is located inside the outer boom 1 and slides in a forward-backward direction. The front end of the inner boom 2 extends from the front end of the outer boom 1 and connects to the excavator bucket. A telescopic drive 3 is provided between the inner boom 2 and the outer boom 1 to drive the inner boom 2 to extend and retract along the outer boom 1. By using a sliding fit between the outer and inner booms and controlling the extension and retraction of the inner boom through the telescopic drive, the overall length of the excavator boom can be adjusted. This design is convenient to use, allows for flexible adjustment of the digging range, and improves the excavator's adaptability.

[0020] In this embodiment, the telescopic drive component 3 includes a transmission rack 4, a worm gear 5, a worm 6, and a drive motor 7. The transmission rack 4 is installed at the middle of the inner bottom of the outer bucket 1 and extends along the length of the outer bucket 1. The drive motor 7, worm gear 5, and worm 6 are all installed inside the rear end of the inner bucket 2. The output shaft of the drive motor 7 extends rearward and is connected to the worm 6 via a coupling 22. The worm gear 5 is located between the worm 6 and the transmission rack 4, and meshes with both the worm 6 and the transmission rack 4. During operation, the drive motor 7 drives the worm 6 to rotate, the worm 6 drives the worm gear 5 to rotate, and the worm gear 5 rolls along the transmission rack 4, thereby driving the inner bucket 2 to move and extend in the forward and backward directions. By controlling the forward or reverse rotation of the drive motor, the inner bucket can be extended forward or retracted backward. The automatic extension and retraction of the outer and inner booms are achieved through a drive motor, worm gear, worm, and transmission rack. It also has a reverse self-locking function to prevent uncontrollable slippage between the outer and inner booms in special circumstances such as power failure, thereby ensuring the safety of the excavator boom and the work safety of the operators.

[0021] In this embodiment, a bottom clearance slot 8 is provided at the middle position of the bottom of the rear end of the inner bucket rod 2. The bottom clearance slot 8 extends to the open rear end of the inner bucket rod 2. The bottom clearance slot 8 facilitates the passage of the worm gear 5 and its engagement with the transmission rack 4.

[0022] In this embodiment, the rear end of the inner bucket rod 2 is provided with a pair of front and rear distributed worm gear mounting seats 9, and the worm 6 is disposed between the pair of worm gear mounting seats 9; a pair of left and right distributed worm wheel mounting holes 10 are provided below the pair of worm gear mounting seats 9, and the central shaft of the worm wheel 5 is disposed between the pair of worm wheel mounting holes 10; a motor mounting seat 11 is provided on the front side of the bottom clearance slot 8, and the drive motor 7 is disposed on the motor mounting seat 11.

[0023] In this embodiment, a rack receiving groove 12 with an upward protrusion is provided at the middle position of the inner bottom of the inner bucket rod 2. The rack receiving groove 12 extends along the length direction of the inner bucket rod 2 and communicates with the bottom clearance groove 8. The transmission rack 4 extends into the rack receiving groove 12 and slides in cooperation with the rack receiving groove 12.

[0024] In this embodiment, the bottom left and right ends of the outer boom 1 are each provided with a row of external heat dissipation holes 13, which are distributed along the length of the outer boom 1. The bottom left and right ends of the inner boom 2 are each provided with a row of internal heat dissipation holes 14, which are distributed along the length of the inner boom 2. The positions of the internal heat dissipation holes 14 and the external heat dissipation holes 13 correspond to those of the outer boom 13. The external and internal heat dissipation holes are used for heat dissipation and cooling of the excavator boom. By providing rows of heat dissipation holes at the bottom of both the inner and outer booms, it is ensured that a certain number of heat dissipation holes are not blocked at any extension or retraction length of the outer and inner booms, thereby ensuring effective ventilation and heat dissipation of the excavator boom during operation.

[0025] In this embodiment, a top clearance slot 15 is provided at the middle of the top of the front end of the outer bucket rod 1; a pair of first connecting lugs 16 are provided at the middle of the top of the front end of the inner bucket rod 2. The pair of first connecting lugs 16 pass through the top clearance slot 15 and are used to connect with the bucket hydraulic cylinder 17. The cylinder seat of the bucket hydraulic cylinder 17 is hinged to the pair of first connecting lugs 16.

[0026] In this embodiment, an electrical wire hole 18 is provided at the middle of the top of the front end of the inner bucket rod 2. The electrical wire hole facilitates the connection of the motor wire to the power supply. The electrical wire hole 18 is located on the front side of a pair of first connecting ear plates 16 and corresponds to the position of the top clearance slot 15.

[0027] In this embodiment, the rear end of the outer boom 1 is provided with a first hinge hole 19 for hinged connection with the excavator boom, and the bottom of the rear end of the outer boom 1 is provided with a pair of second connecting lugs 20, which are used to connect with the boom hydraulic cylinder.

[0028] In this embodiment, the front end of the inner bucket rod 2 is provided with a second hinge hole 21 for hinged connection with the excavator bucket.

[0029] The advantages of this utility model are: (1) The automatic extension and retraction function of the outer boom and inner boom is realized through the motor, worm gear and worm, and worm gear and rack, and it has a reverse self-locking function, which can prevent uncontrollable sliding between the outer boom and inner boom under special circumstances such as power failure, thereby ensuring the equipment safety of the excavator boom and the work safety of the operator; (2) Both the outer boom and inner boom are provided with randomly positioned heat dissipation holes, ensuring that at any length, the outer boom and inner boom have a certain number of heat dissipation holes that are not blocked by each other, thereby ensuring that the excavator boom can achieve effective ventilation and heat dissipation during operation.

[0030] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0031] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this utility model to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0032] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A retractable excavator boom, characterized in that: It includes an outer boom and an inner boom, both of which are box-shaped. The rear end of the outer boom is used to connect to the excavator boom. The inner boom is located inside the outer boom and slides in a forward and backward direction with the outer boom. The front end of the inner boom extends from the front end of the outer boom and is used to connect to the excavator bucket. A telescopic drive is provided between the inner boom and the outer boom to drive the inner boom to extend and retract along the outer boom.

2. The retractable excavator boom according to claim 1, characterized in that: The telescopic drive component includes a transmission rack, a worm gear, a worm, and a drive motor. The transmission rack is installed at the inner bottom of the outer bucket and extends along the length of the outer bucket. The drive motor is installed inside the rear end of the inner bucket, and the output shaft of the drive motor extends to the rear and is connected to the worm through a coupling. The worm gear is located between the worm and the transmission rack, and the worm gear meshes with both the worm and the transmission rack.

3. The retractable excavator boom according to claim 2, characterized in that: The bottom of the rear end of the inner bucket rod has a bottom clearance slot to facilitate the passage of the worm gear and its engagement with the transmission rack.

4. The retractable excavator boom according to claim 2, characterized in that: The inner bucket rod has a pair of front and rear distributed worm gear mounting seats inside its rear end, with the worm gear positioned between the pair of worm gear mounting seats; below the pair of worm gear mounting seats is a pair of left and right distributed worm wheel mounting holes, with the worm wheel positioned between the pair of worm wheel mounting holes.

5. The retractable excavator boom according to claim 2, characterized in that: The inner bottom of the inner bucket rod is provided with a rack receiving groove, which extends along the length of the inner bucket rod; the transmission rack extends into the rack receiving groove and slides in cooperation with the rack receiving groove.

6. The retractable excavator boom according to claim 1, characterized in that: The bottom left and right ends of the outer bucket rod are each provided with a row of external heat dissipation holes, which are distributed along the length of the outer bucket rod; the bottom left and right ends of the inner bucket rod are each provided with a row of internal heat dissipation holes, which are distributed along the length of the inner bucket rod, and the positions of the internal heat dissipation holes correspond to those of the external heat dissipation holes.

7. The retractable excavator boom according to claim 1, characterized in that: The outer bucket rod has a top clearance slot at the top center of its front end; the inner bucket rod has a pair of first connecting lugs at the top center of its front end, which pass through the top clearance slot and are used to connect to the bucket hydraulic cylinder.

8. The retractable excavator boom according to claim 7, characterized in that: An electrical wire hole is provided at the top center of the front end of the inner bucket rod. The electrical wire hole is located on the front side of a pair of first connecting ear plates and corresponds to the position of the top clearance slot.

9. A retractable excavator boom according to claim 1, characterized in that: The outer boom has a first hinge hole at its rear end for hinged connection with the excavator boom, and a pair of second connecting lugs at the bottom of the rear end of the outer boom for connection with the boom hydraulic cylinder.

10. A retractable excavator boom according to claim 1, characterized in that: The front end of the inner bucket rod is provided with a second hinge hole for hinged connection with the excavator bucket.

Images