A reinforcing structure for a boom cylinder seat of a hydraulic excavator

Abstract

The utility model discloses a kind of reinforcing structure for hydraulic excavator big arm oil cylinder seat, including excavator big arm body, oil cylinder seat, oil cylinder seat is set in the middle part of excavator big arm body;The oil cylinder seat further include mounting shaft body, reinforcing plate I, pin shaft mounting seat, mounting shaft body is set in the inside of excavator big arm body, reinforcing plate I is welded and set in the side of the mounting shaft body of excavator big arm inside, the both sides of mounting shaft body are provided with the pin shaft mounting seat of facilitating lubrication.The function of the utility model is to increase the structural strength of oil cylinder seat, improve the service life of oil cylinder seat;Pin shaft is replaced quickly, improve the replacement efficiency of pin shaft, and lubrication can be carried out without pin shaft being disassembled, simple and efficient, above-mentioned improvement reduces maintenance cost, reduces maintenance labor intensity, improves equipment attendance rate, actual action rate, improves equipment production efficiency, reduces equipment failure rate, eliminates equipment accident safety hidden danger.

Description

Technical Field

[0001] This utility model belongs to the technical field of excavator cylinder seat, and particularly relates to a reinforcing structure for the hydraulic excavator boom cylinder seat. Background Technology

[0002] The core working principle of an excavator boom (arm) is to drive hydraulic cylinders mounted on it through a hydraulic system, converting hydraulic energy into mechanical energy to achieve the lifting and lowering movement of the boom. Specifically, the operating handle controls the hydraulic valve, delivering high-pressure oil to the rodless chamber (lifting) or rod chamber (lowering) of the boom cylinder, pushing the piston rod to extend or retract. Since the two ends of the cylinder are hinged to the turntable and the boom by pins, the extension and retraction of the cylinder is converted into the rotational movement of the boom around its root pin, thereby driving the entire front working device to complete actions such as digging, lifting, or unloading.

[0003] In existing technology, the boom cylinder seat of the Liebherr R966HD hydraulic excavator suffers from frequent cracking failures due to defects in the manufacturer's structural design. The manufacturer designed the boom cylinder seat with independent structures on both sides, resulting in unilateral stress during operation. This structure is highly susceptible to cracking and damage on one side of the boom cylinder seat under excessive loads. This structural failure weakens the load-bearing capacity of the boom cylinder seat, leading to jeopardized welding and compromised overall boom structural integrity. After repair, the service life is extremely short. According to the statistical analysis of operational failures, after welding and repairing the boom cylinder seat, the same failure occurs every 3 days or so. Each welding and repair takes about 9 hours. In addition, the pin of the cylinder seat needs to be lubricated frequently during use. The existing cylinder seat structure makes it inconvenient to add lubricant to the connection between the cylinder and the pin, resulting in lubrication difficulties. Furthermore, the pin of this structure needs to be replaced after its service life. The existing excavator boom cylinder seat pin is not easy to disassemble and assemble, making replacement difficult.

[0004] In summary, the existing technology has the following drawbacks: First, the single-sided boom cylinder seat will develop cracks during operation. Repairing these cracks requires air gouging of the cylinder seat followed by welding. Although this can alleviate the immediate need, the service life of the cylinder seat after this treatment is extremely short, reducing its reliability. Second, the existing cylinder seat structure makes it inconvenient to add lubricant to the connection between the cylinder and the pin, resulting in lubrication difficulties. Furthermore, the pins in this structure need to be replaced after their service life is reached, and the pins of the existing excavator boom cylinder seat are not easy to disassemble and assemble, making replacement difficult.

[0005] Therefore, this utility model provides a reinforcing structure for the hydraulic cylinder seat of the boom of a hydraulic excavator. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model discloses a reinforced structure for the hydraulic cylinder seat of a hydraulic excavator boom. This structure increases the structural strength of the cylinder seat and extends its service life. It also allows for quick replacement of the pin, improving replacement efficiency, and enables lubrication without removing the pin, making it simple and efficient. These improvements reduce maintenance costs and labor intensity, increase equipment uptime and operational rate, improve equipment production efficiency, reduce equipment failure rate, and eliminate potential safety hazards related to equipment accidents.

[0007] To achieve the above-mentioned technical effects, this utility model provides a reinforcing structure for the hydraulic cylinder seat of a hydraulic excavator boom, including an excavator boom body and a cylinder seat, with the cylinder seat located in the middle of the excavator boom body; the cylinder seat also includes a mounting shaft, a reinforcing plate I, and a pin mounting seat, the mounting shaft being disposed through the interior of the excavator boom body, the reinforcing plate I being welded to the side of the mounting shaft on the inner side of the excavator boom, and pin mounting seats for convenient lubrication being provided on both sides of the mounting shaft.

[0008] Preferably, reinforcing plates II are welded to the connection points between the two ends of the mounting shaft and the outer side of the excavator boom body.

[0009] Preferably, triangular reinforcing plates III are provided on the left and right sides of the reinforcing plate II.

[0010] Preferably, the mounting shaft is provided with pin mounting holes on both sides.

[0011] Preferably, the cylinder seat further includes a cylinder cover, a mounting cover, and a pin. The cylinder cover, which has an opening on one side, is welded to the front side of the reinforcing plate II. The mounting cover is threaded to the front side of the cylinder cover, and the pin is inserted into the inner side of the cylinder cover.

[0012] Preferably, a lubrication hole is provided above the connection between the sleeve and the mounting cover, with the lower end of the lubrication hole fitting the pin and penetrating the top of the sleeve.

[0013] Preferably, the mounting cover has an opening in the middle, the size of which is smaller than the size of the top of the pin.

[0014] Preferably, a pull ring is welded to the top of the pin.

[0015] Preferably, limiting plates are welded to both sides of the pin, and the limiting plates are slidably connected to the slots on the sleeve.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This device features a cylinder seat with mounting shafts and pin mounting bases. Reinforcing plates I, II, and III connect the cylinder seats on both sides together to increase the structural strength and service life of the cylinder seats. The device also allows for quick pin replacement, improving replacement efficiency, and lubrication can be performed without removing the pins, making it simple and efficient. These improvements reduce maintenance costs and labor intensity, increase equipment uptime and operational rate, improve equipment production efficiency, reduce equipment failure rate, and eliminate potential safety hazards related to equipment accidents. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention; Figure 2 yes Figure 1 A sectional view of section a. Figure 3 yes Figure 2 A partial schematic diagram of b in the middle; Figure 4 This is an isometric view of the present invention; Figure 5 yes Figure 4 A partial schematic diagram of c in the middle; The attached diagram lists the components represented by each number as follows: 1. Excavator boom body; 2. Cylinder seat; 3. Mounting shaft; 4. Reinforcing plate I; 5. Pin mounting seat; 6. Reinforcing plate II; 7. Reinforcing plate III; 8. Pin mounting hole; 9. Cylinder cover; 10. Mounting cover; 11. Pin; 12. Lubrication hole; 13. Pull ring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 scope of protection of the present utility model.

[0019] like Figures 1 to 5 As shown, the prior art in this embodiment has the following problems: The inventor found the following defects in the prior art: First, the single-sided boom cylinder seat will develop cracks during operation. Repairing these cracks requires air gouging the cylinder seat and then welding it. Although this treatment can alleviate the problem temporarily, the service life of the cylinder seat after this treatment is extremely short, reducing the reliability of the cylinder seat. Second, the existing cylinder seat structure makes it inconvenient to add lubricant to the connection between the cylinder and the pin, resulting in lubrication difficulties. Furthermore, the pins of this structure need to be replaced after their service life is reached. The existing cylinder seat pins of the excavator boom are not easy to disassemble and assemble, making replacement difficult. Therefore, the inventor provides a reinforcing structure for the hydraulic cylinder seat of a hydraulic excavator boom, including an excavator boom body 1 and a cylinder seat 2, with the cylinder seat 2 located in the middle of the excavator boom body 1; the cylinder seat 2 also includes a mounting shaft 3, a reinforcing plate I 4, and a pin mounting seat 5, with the mounting shaft 3 penetrating inside the excavator boom body 1, the reinforcing plate I 4 welded to the side of the mounting shaft 3 on the inner side of the excavator boom, and pin mounting seats 5 for convenient lubrication provided on both sides of the mounting shaft 3.

[0020] Furthermore, reinforcing plates II6 are welded to the connection points between the two ends of the mounting shaft 3 and the outer side of the excavator boom body 1; Among them, the reinforcing plate II6 is welded to the side of the excavator boom body 1, the mounting shaft 3 passes through the reinforcing plate II6, and the side of the mounting shaft 3 is welded to the front end of the reinforcing plate II6. In this way, the cylinder seat 2 is set as a shaft. By connecting the cylinder seats 2 on both sides into one body, the structural strength of the cylinder seat 2 is increased and the service life of the cylinder seat 2 is improved.

[0021] Furthermore, triangular reinforcing plates III7 are provided on the left and right sides of reinforcing plate II6; Among them, the triangular reinforcing plate Ⅲ7 on the side of the reinforcing plate Ⅱ6 is welded to enhance the structural strength of the mounting shaft 3.

[0022] Furthermore, pin mounting holes 8 are provided on both sides of the mounting shaft 3; Among them, after the pin 11 is installed on the cylinder seat 2, it is inserted into the pin mounting hole 8 on the mounting shaft body 3.

[0023] Furthermore, the cylinder seat 2 also includes a cylinder cover 9, a mounting cover 10, and a pin 11. The cylinder cover 9, which has an opening on one side, is welded to the front side of the reinforcing plate II 6. The mounting cover 10 is threaded to the front side of the cylinder cover 9, and the pin 11 is inserted into the inside of the cylinder cover 9. To install the pin, remove the nut on the mounting cover 10 and take off the mounting cover 10. Then, the pin 11 can be inserted into the pin mounting hole 8 of the mounting shaft body 3. When inserting, the shims are pre-installed on both sides of the pin 11 inside the cylinder cover 9. When inserting the pin 11, the connecting ear hole at the front end of the oil cylinder is inserted into the pin 11 simultaneously to complete the installation. When removing pin 11, remove the nut on the mounting cover 10 to take out the worn pin 11 for replacement.

[0024] Furthermore, a lubrication hole 12 is provided above the connection between the cylindrical cover 9 and the mounting cover 10, and the lower end of the lubrication hole 12 is attached to the pin 11 and passes through the top end of the cylindrical cover 9. When the cylinder cover 9 is installed with the mounting cover 10, the position of the lubrication hole 12 is aligned. After the pin 11 is installed, lubricating oil is poured in through the lubrication hole 12. The lubricating oil comes into contact with the surface of the pin 11 from the lower end of the lubrication hole 12 for lubrication. Due to the capillary action of the liquid, the lubricating oil penetrates and lubricates between the pin 11 and the connecting lug hole of the hydraulic cylinder. When adding lubricating oil, the hydraulic cylinder can be used to push the excavator boom to swing, so that the lubricating oil between the connecting lug hole of the hydraulic cylinder and the pin 11 can penetrate more fully. In this way, the pin 11 does not need to be removed, which is simple and efficient.

[0025] Furthermore, the mounting cover 10 has an opening in the middle, the size of which is smaller than the size of the top end of the pin 11; The mounting hole cover is located above the cylinder cover 9, allowing the pull ring 13 at the top of the pin 11 to pass through the mounting cover 10 and allowing the pin 11 to be inserted and confined inside the cylinder seat 2.

[0026] Furthermore, a pull ring 13 is welded to the top of the pin 11; The pull ring 13 can serve as an auxiliary fulcrum when replacing the pin 11, allowing the operator to pry the pin 11 off using the pull ring 13. This method enables quick replacement of the pin 11 and improves the replacement efficiency of the pin 11.

[0027] Furthermore, limit plates (not shown in the figure) are welded to both sides of the pin 11, and the limit plates are slidably connected to the slots on the sleeve 9; Among them, after the pin 11 is inserted into the cylinder seat 2, the pin 11 is restricted by the connection between the limiting plate and the cylinder cover 9 to prevent the pin 11 from rotating in the cylinder seat 2.

[0028] In summary, the device is equipped with a cylinder seat 2 with a mounting shaft 3 and a pin mounting seat 5. By connecting the cylinder seats 2 on both sides into one unit, the structural strength of the cylinder seat 2 is increased and the service life of the cylinder seat 2 is extended. The pin 11 can be quickly replaced, which improves the replacement efficiency of the pin 11. Furthermore, lubrication can be performed without removing the pin 11, which is simple and efficient.

[0029] The working principle of this utility model: When installing the sleeve cover 9 with the mounting cover 10, remove the nut on the mounting cover 10 and remove the mounting cover 10. Then, the pin 11 can be inserted into the pin mounting hole 8 of the mounting shaft body 3. When inserting, pre-install the gaskets on both sides of the pin 11 inside the sleeve cover 9. When inserting the pin 11, insert the connecting ear hole at the front end of the oil cylinder and the pin 11 simultaneously to complete the installation. Align the lubrication hole 12 to complete the installation. After the pin 11 is installed, lubricating oil is poured in through the lubrication hole 12. The lubricating oil comes into contact with the surface of the pin 11 from the lower end of the lubrication hole 12 for lubrication. The lubricating oil penetrates and lubricates between the pin 11 and the connecting lug hole of the hydraulic cylinder due to the capillary action of the liquid. When adding lubricating oil, the hydraulic cylinder can be used to push the excavator boom to swing, so that the lubricating oil between the connecting lug hole of the hydraulic cylinder and the pin 11 can penetrate more fully. Lubrication is performed in this way without removing the pin 11, which is simple and efficient. During use, reinforcing plates I4, II6, and III7 connect the mounting shaft 3 to the excavator boom as a whole, ensuring uniform force distribution, increasing the overall strength of the boom cylinder seat 2, and increasing the reliability of the cylinder seat 2. After the pin 11 is inserted into the cylinder seat 2, the pin 11 is restricted by the connection between the limiting plate and the cylinder cover 9 to prevent the pin 11 from rotating in the cylinder seat 2. During the rotation of the pin 11 and the connecting lug of the cylinder, the pin 11 will be worn. When the pin 11 reaches the end of its service life and needs to be replaced, the nut on the mounting cover 10 is removed. The pull ring 13 can be used as an auxiliary fulcrum when replacing the pin 11, allowing the operator to pry the pin 11 off through the pull ring 13. This method allows for quick replacement of the pin 11 and improves the replacement efficiency of the pin 11. After adopting this solution, the problem of frequent cracking of the boom cylinder seat 2 can be effectively solved. After the modification and repair, the service life of the equipment has been significantly extended (currently, the service life has been extended by about 2 years without failure), maintenance costs have been reduced, maintenance labor intensity has been reduced, equipment uptime and operation rate have been increased, equipment production efficiency has been improved, equipment failure rate has been reduced, and potential safety hazards of equipment accidents have been eliminated.

[0030] This concludes the description of the working principle of the device.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reinforcing structure for a hydraulic excavator boom cylinder seat, comprising an excavator boom body (1) and a cylinder seat (2), wherein the cylinder seat (2) is disposed in the middle of the excavator boom body (1), characterized in that: The cylinder seat (2) also includes a mounting shaft (3), a reinforcing plate I (4), and a pin mounting seat (5). The mounting shaft (3) is installed inside the excavator boom body (1). The reinforcing plate I (4) is welded to the side of the mounting shaft (3) on the inside of the excavator boom. The mounting shaft (3) is provided with convenient lubrication pin mounting seats (5) on both sides.

2. The reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 1, characterized in that: The two ends of the mounting shaft (3) are welded to the outer side of the excavator boom body (1) with reinforcing plates II (6).

3. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 2, characterized in that: The reinforcing plate II (6) is provided with triangular reinforcing plates III (7) on both the left and right sides.

4. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 1, characterized in that: The mounting shaft (3) is provided with pin mounting holes (8) on both sides.

5. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 1, characterized in that: The cylinder seat (2) also includes a cylinder cover (9), a mounting cover (10), and a pin (11). The cylinder cover (9), which has an opening on one side, is welded to the front side of the reinforcing plate II (6). The mounting cover (10) is connected to the front side of the cylinder cover (9) by a thread. The pin (11) is inserted into the inside of the cylinder cover (9).

6. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 5, characterized in that: A lubrication hole (12) is provided above the connection between the sleeve (9) and the mounting cover (10). The lower end of the lubrication hole (12) is attached to the pin (11) and passes through the top of the sleeve (9).

7. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 5, characterized in that: The mounting cover (10) has an opening in the middle, and the size of the opening is smaller than the size of the top of the pin (11).

8. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 5, characterized in that: A pull ring (13) is welded to the top of the pin (11).

9. A reinforcing structure for the hydraulic excavator boom cylinder seat according to claim 5, characterized in that: Limiting plates are welded to both sides of the pin (11), and the limiting plates are slidably connected to the slots on the sleeve (9).

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