Pin shaft insertion and extraction device for excavator

Abstract

The utility model discloses a pin shaft plug -pulling device of excavator, including the ring of connecting in the one end of pin shaft, the support frame of connecting in the ear plate end face, set up in the pry bar between ring and support frame, pin shaft end part has established first threaded hole, and the ring includes the interconnection of ring body and screw segment, and the interlock relation between ring and pin shaft is connected through the screw segment and first threaded hole, and the support frame includes bottom plate, the side plate of parallel setting in bottom plate both ends, set up in a plurality of mutually parallel cross bars between two side plates, and the through hole is established in bottom plate, and the ear plate end face located pin hole one side has established second threaded hole, and the fastener is connected between through hole and second threaded hole, and the support frame is fixed in the ear plate end face through fastener, and the pry bar includes the interconnection of handle and rod head, and handle is located between two side plates and two adjacent cross bars, and the rod head is matched in ring body and sets up in ring, this device does not need to rely on the knocking force, and pin shaft is disassembled through the lever principle.

Description

Technical Field

[0001] This utility model belongs to the field of excavator technology, specifically relating to a pin insertion and removal device for an excavator. Background Technology

[0002] Excavators are core heavy equipment in engineering construction, mining, and other fields. The maintenance and repair of their working devices (including boom, stick, cylinders, etc.) directly affects project efficiency. As a key hinge component of the working device, the pin must be disassembled, inspected, or replaced simultaneously with the replacement of other components. Currently, the common method for disassembling and assembling pins in large excavators is the hammering process: using a sliding hammer or pendant hammer to strike one end of the pin to achieve disassembly (removal) and installation (hammering). This process is widely used in the maintenance of conventional large excavators due to its simplicity and low cost.

[0003] To enhance load-bearing capacity, ultra-large excavators, often used in large mines and similar environments, frequently employ a dual-cylinder parallel design in key components. This design severely restricts the axial space of the pin end face, rendering tools such as sliding hammers and drop hammers unusable and hindering the application of effective striking force. Consequently, pin assembly and disassembly efficiency is extremely low. Furthermore, even when operation is attempted, the striking force easily causes dents and deformation on the pin end face, resulting in difficult and costly repairs. If dimensional accuracy is compromised after repair, it can lead to excessive assembly clearances, causing abnormal noises at the hinges, accelerated wear, and other malfunctions, severely impacting the operational stability of ultra-large excavators. Therefore, a pin insertion and removal device for excavators is urgently needed. Utility Model Content

[0004] To address some or all of the technical problems existing in the prior art, this utility model provides a pin insertion and removal device for an excavator, wherein the pin is inserted into a pin hole opened in a lug plate. The device comprises a fitting ring connected to one end of the pin, a support frame connected to the end face of the lug plate, and a pry bar disposed between the fitting ring and the support frame.

[0005] The pin shaft end is provided with a first threaded hole, and the fitting ring includes a ring body and a threaded section that are connected to each other. The fitting ring and the pin shaft are connected by the meshing relationship between the threaded section and the first threaded hole.

[0006] The support frame includes a base plate, side plates arranged parallel to both ends of the base plate, and a plurality of parallel crossbars arranged between the two side plates. A through hole is provided on the base plate, and a second threaded hole is provided on the end face of the ear plate located on one side of the pin hole. A fastener is connected between the through hole and the second threaded hole, and the support frame is fixed to the end face of the ear plate by the fastener.

[0007] The pry bar includes a grip and a head connected to each other. The head is located at one end of the grip, which is situated between two side plates and two adjacent crossbars. The head is fitted to the ring body and positioned within the matching ring.

[0008] Furthermore, in the aforementioned excavator's pin insertion and removal device, the number of crossbars is 10 to 20.

[0009] Furthermore, in the aforementioned excavator's pin insertion and removal device, both ends of the crossbar are respectively threadedly connected to the side plate.

[0010] Furthermore, in the aforementioned excavator's pin insertion and removal device, both the top and bottom ends of the rod head are provided with arc-shaped surfaces that match the outer periphery of the annulus.

[0011] Furthermore, in the aforementioned pin insertion and removal device of the excavator, the fastener is a fastening bolt, and a washer is provided between the fastener and the ear plate.

[0012] Furthermore, in the aforementioned excavator's pin insertion and removal device, the rod head and the grip are detachably connected.

[0013] The pin insertion and removal device for excavators of this utility model has the following advantages and beneficial effects:

[0014] (1) This device does not rely on hammering force. It transmits force through the lever principle, effectively avoiding damage such as pits and deformation on the end face of the pin shaft caused by hammering, reducing the cost of pin shaft repair, while ensuring the pin shaft size accuracy, ensuring that the subsequent assembly clearance meets the standard, improving the operating stability of the excavator working device, and the support frame is fixed to the end face of the ear plate by fasteners. The cooperation structure of the pry bar and the matching ring does not need to occupy too much axial space on the end face of the pin shaft, which can adapt to the narrow operating space brought about by the parallel design of the double oil cylinders of the ultra-large excavator, and solves the problem that the hammering tool cannot be inserted.

[0015] (2) Multiple crossbars are arranged at intervals on the support frame of this device. The position of the pry bar fulcrum can be flexibly adjusted according to the progress of the pin assembly and disassembly, ensuring that effective force can be applied throughout the entire process of pin assembly and disassembly, avoiding the situation where force cannot be applied due to unsuitable fulcrum, significantly improving the efficiency of pin assembly and disassembly. Moreover, each component is connected in a detachable or adaptable manner, which is convenient for adjustment according to different specifications of pins and ear plates, improving the overall applicability of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0017] Figure 1 This is a schematic diagram of the pin insertion and removal device for an excavator according to the present invention.

[0018] Figure 2 This is an exploded view of the pin insertion and removal device for the excavator according to this utility model;

[0019] Figure 3 This is a schematic diagram of the fitting ring structure in the pin insertion and removal device of the excavator according to this utility model;

[0020] Figure 4 This is a schematic diagram of the support frame in the pin insertion and removal device of the excavator according to the present invention;

[0021] Figure 5 This is a schematic diagram of the pry bar structure in the pin insertion and removal device of the excavator according to this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Fitting ring; 11. Ring body; 12. Threaded section; 2. Support frame; 21. Base plate; 22. Side plate; 23. Crossbar; 3. Pry bar; 31. Pry bar head; 32. Handle bar; 4. First threaded hole; 5. Second threaded hole; 6. Fastener; 7. Washer; 100. Ear plate; 200. Pin. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] like Figures 1 to 5 As shown, this utility model discloses a pin insertion and removal device for an excavator. A pin 200 is inserted into a pin hole on a lug 100. The excavator pin insertion and removal device includes a fitting ring 1 connected to one end of the pin 200, a support frame 2 connected to the end face of the lug 100, and a pry bar 3 disposed between the fitting ring 1 and the support frame 2.

[0026] The pin 200 has a first threaded hole 4 at its end. The fitting ring 1 includes a ring body 11 and a threaded section 12 that are connected to each other. The fitting ring 1 and the pin 200 are connected by the meshing relationship between the threaded section 12 and the first threaded hole 4. The threaded meshing connection can ensure the connection between the fitting ring 1 and the pin 200, prevent the fitting ring 1 from separating from the pin 200 during disassembly and assembly, and avoid hard damage to the end of the pin 200. At the same time, the fitting ring 1 can be replaced with a suitable one according to the pin 200 specification, which improves the versatility of the device.

[0027] The support frame 2 includes a base plate 21, side plates 22 arranged parallel to both ends of the base plate 21, and multiple parallel crossbars 23 arranged between the two side plates 22. The multiple crossbars 23 are spaced apart, and the fulcrum position of the pry bar 3 can be flexibly adjusted according to the disassembly and assembly progress of the pin 200, so as to ensure that effective force can be applied at different stages of the disassembly and assembly of the pin 200. A through hole is provided on the base plate 21, and a second threaded hole 5 is provided on the end face of the ear plate 100 located on one side of the pin hole. A fastener 6 is connected between the through hole and the second threaded hole 5. The support frame 2 is fixed to the end face of the ear plate 100 by the fastener 6, and the base plate 21 is fixed to the end face of the ear plate 100 by the fastener 6 passing through the through hole and the second threaded hole 5, so as to ensure that the support frame 2 will not be displaced during the disassembly and assembly process, and to provide a stable fulcrum foundation for the pry bar 3.

[0028] The pry bar 3 includes a grip bar 32 and a bar head 31 connected to each other. The bar head 31 is located at one end of the grip bar 32. The grip bar 32 is located between the two side plates 22 and the two adjacent crossbars 23. The bar head 31 is matched with the ring body 11 and is located in the fitting ring 1, so that the bar head 31 can be embedded in the fitting ring 1 and form a stable contact with the ring body 11, so as to prevent the bar head 31 from slipping off the fitting ring 1 when force is applied.

[0029] In one specific embodiment, the number of crossbars 23 in the excavator pin insertion and removal device of this utility model is 10 to 20, more specifically, the number of crossbars 23 is 14. Of course, the specific number of crossbars 23 needs to be set according to the size of the pin 200 and the pry bar 3 in actual use.

[0030] In one specific embodiment, in the pin insertion and removal device of the excavator of this utility model, the two ends of the crossbar 23 are respectively connected to the side plate 22 by threads. This arrangement not only facilitates the flexible adjustment of the spacing and position of the crossbar 23 according to the disassembly and assembly progress of the pin 200 to adapt to the fulcrum requirements of the pry bar 3 at different stages, but also ensures that the connection between the crossbar 23 and the side plate 22 is stable so as to withstand the pressure when the pry bar 3 applies force.

[0031] As a specific implementation, in the pin insertion and removal device of the excavator of this utility model, the top and bottom ends of the rod head 31 are provided with arc-shaped surfaces that match the outer periphery of the ring body 11. This arrangement can ensure that the rod head 31 and the outer periphery of the matching ring 1 are tightly fitted to avoid slippage when force is applied, and can also increase the contact area between the two to prevent damage to the matching ring 1 or the rod head 31 due to local force. At the same time, it can adapt to the force requirements of the rod head 31 in different directions when pulling out or pressing the pin, and ensure the stable transmission of force.

[0032] In one specific embodiment, in the pin insertion and removal device of the excavator of this utility model, the fastener 6 is a fastening bolt, and a washer 7 is provided between the fastener 6 and the ear plate 100. This arrangement increases the contact area, disperses the tightening pressure of the fastener 6, prevents damage to the ear plate 100, ensures that the base plate 21 of the support frame 2 and the ear plate 100 are tightly fitted, and thus ensures the stability of the support frame 2.

[0033] In one specific implementation, in the excavator pin insertion and removal device of this utility model, the rod head 31 and the grip 32 are detachably connected. This configuration allows for flexible replacement of the appropriate rod head 31 according to the specifications of the matching ring 1 corresponding to the pin 200 to be disassembled, ensuring stable fit during force application. It also allows for the replacement of the rod head 31 separately when it is worn or damaged due to force, without having to replace the entire pry bar 3, thus reducing maintenance costs and improving the adaptability of the device.

[0034] The working principle of the excavator pin insertion and removal device of this utility model is as follows:

[0035] First, the fitting ring 1 engages with the first threaded hole 4 at the end of the pin 200 through the threaded section 12, establishing a stable connection and providing a reliable interface for force transmission, preventing it from disengaging from the pin 200 when force is applied. Then, the support frame 2 is fixed to the end face of the ear plate 100 by fasteners 6 (including washers 7), and its base plate 21 ensures overall stability. The multiple parallel crossbars 23 between the two side plates 22 serve as adjustable fulcrums for the pry bar 3. By arranging the crossbars 23 at intervals, the fulcrum position can be flexibly switched according to the progress of the pin 200 disassembly and assembly, ensuring that an effective lever arm can be formed throughout the process. When disassembling or assembling the pin 200, the pry bar 3 head 31 is engaged. Inside the fitting ring 1, the grip 32 is placed between the two side plates 22 and the adjacent crossbar 23. When pulling out the pin, a downward force is applied to the far end of the grip 32, using the crossbar 23 as a fulcrum, and the force is amplified by lever. The pin 200 is driven to move upward along the pin hole axially through the rod head 31 and the fitting ring 1. When pressing the pin, a downward force is applied to the far end of the grip 32, and the pin 200 is pushed downward along the pin hole axially through the rod head 31 and the fitting ring 1 to insert into the pin hole. As the pin 200 moves, when the lever arm of the current fulcrum is insufficient, the grip 32 is adjusted to switch the fulcrum between other crossbars 23 to continuously transmit the effective force until the pin 200 is completely disassembled.

[0036] In summary, compared with the prior art, the excavator pin insertion and removal device of this utility model has the following advantages and beneficial effects:

[0037] (1) This device does not rely on hammering force. It transmits force through the lever principle, effectively avoiding damage such as pits and deformation on the end face of the pin 200 caused by hammering, reducing the repair cost of the pin 200, while ensuring the dimensional accuracy of the pin 200, ensuring that the subsequent assembly gap meets the standard, and improving the operating stability of the excavator working device. In addition, the support frame 2 is fixed to the end face of the ear plate 100 by fasteners 6. The cooperation structure between the pry bar 3 and the matching ring 1 does not need to occupy too much axial space on the end face of the pin 200. It can adapt to the narrow operating space brought about by the parallel design of the double cylinders of the ultra-large excavator, and solves the problem that the hammering tool cannot be inserted.

[0038] (2) Multiple crossbars 23 are arranged at intervals on the support frame 2 of this device. The position of the pry bar 3 can be flexibly adjusted according to the disassembly and assembly progress of the pin 200, ensuring that effective force can be applied throughout the disassembly and assembly of the pin 200, avoiding the situation where force cannot be applied due to unsuitable support points, significantly improving the disassembly and assembly efficiency of the pin 200. Moreover, each component is connected in a detachable or adaptable manner, which is convenient for adjustment according to different specifications of pin 200 and ear plate 100, improving the overall applicability of the device.

[0039] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement state shown in the accompanying drawings.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to 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 of the embodiments of this utility model.

Claims

1. A pin insertion and removal device for an excavator, wherein the pin is inserted into a pin hole opened in a lug plate, characterized in that, The excavator's pin insertion and removal device includes a fitting ring connected to one end of the pin, a support frame connected to the end face of the ear plate, and a pry bar disposed between the fitting ring and the support frame, wherein: The pin shaft end is provided with a first threaded hole, and the fitting ring includes a ring body and a threaded section that are connected to each other. The fitting ring and the pin shaft are connected by the meshing relationship between the threaded section and the first threaded hole. The support frame includes a base plate, side plates arranged parallel to both ends of the base plate, and a plurality of parallel crossbars arranged between the two side plates. A through hole is provided on the base plate, and a second threaded hole is provided on the end face of the ear plate located on one side of the pin hole. A fastener is connected between the through hole and the second threaded hole, and the support frame is fixed to the end face of the ear plate by the fastener. The pry bar includes a grip and a head connected to each other. The head is located at one end of the grip, which is situated between two side plates and two adjacent crossbars. The head is fitted to the ring body and positioned within the matching ring.

2. The pin insertion and removal device for an excavator according to claim 1, characterized in that, The number of crossbars is 10 to 20.

3. The pin insertion and removal device for an excavator according to claim 1, characterized in that, The two ends of the crossbar are respectively connected to the side plate by threads.

4. The pin insertion and removal device for an excavator according to claim 1, characterized in that, Both the top and bottom of the rod head are provided with arc-shaped surfaces that match the outer periphery of the ring.

5. The pin insertion and removal device for an excavator according to claim 1, characterized in that, The fastener is a fastening bolt, and a washer is provided between the fastener and the ear plate.

6. The pin insertion and removal device for an excavator according to claim 1, characterized in that, The clubhead and the grip are detachably connected.

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