A double-oil-cylinder pin shaft mounting structure and excavator

Abstract

The utility model discloses a kind of double oil cylinder pin shaft mounting structure and excavator, it is related to mechanical structure design technical field, double oil cylinder pin shaft mounting structure includes: pin shaft cylinder, pressing plate, cover plate;Pin shaft cylinder is arranged in the pin shaft hole on mounting seat, for rotatingly connecting first oil cylinder and second oil cylinder in mounting seat;Pressing plate is detachably installed in the first end of pin shaft cylinder, and pressing plate can be engaged in the limiting clamping groove set in the first side of mounting seat;Cover plate is detachably installed in the second end of pin shaft cylinder, and cover plate can be attached to the second side of mounting seat to axially limit pin shaft cylinder.Such setting, by the pin shaft cylinder of axially movable and the pressing plate and cover plate design of two ends independently detachable, when disassembling any side oil cylinder, only need to remove the fixing member of this side and push pin shaft to middle, operation can be completed, without disassembling another side oil cylinder, greatly simplify maintenance process, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mechanical structure design technology, and in particular to a double hydraulic cylinder pin mounting structure and an excavator. Background Technology

[0002] With the maturation of complete mining truck technology in recent years, the market demand for 150-ton hydraulic excavators has been increasing daily. For the hydraulic cylinder selection in the working device of ultra-large excavators, some use single-cylinder operation while others use double-cylinder operation. For single-cylinder models, the cylinder pin is fixed by a clamping plate on the shaft end and a stop block on the mounting base for pin rotation and fixation. A pressure plate and bolts are then used to fix the pin axially at one end of the shaft end plate. This installation method allows the pin to be installed and removed from the end plate direction. However, when this method is applied to a double-cylinder system, and the assembly space is insufficient to accommodate two pins, the single-direction entry and exit of the pin has drawbacks. When disassembling or assembling the cylinder near the pin, the other cylinder must be removed, increasing the difficulty of disassembly and assembly.

[0003] Therefore, how to provide a pin that can be installed and disassembled in both directions is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a dual-cylinder pin mounting structure and an excavator, which enables bidirectional disassembly and installation of the pins connecting the cylinders.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A dual-cylinder pin mounting structure includes:

[0007] A pin column, which passes through a pin hole on the mounting base, is used to rotatably connect the first oil cylinder and the second oil cylinder to the mounting base;

[0008] The pressure plate is detachably installed at the first end of the pin column, and the pressure plate can be engaged with the limiting groove provided on the first side of the mounting base;

[0009] The cover plate is detachably mounted on the second end of the pin shaft, and the cover plate can abut against the second side of the mounting base to axially limit the pin shaft.

[0010] In one possible implementation, a rectangular groove is provided at the first end of the pin column for mounting a pressure plate. A first threaded hole for a first fixing bolt is provided in the groove, and a first washer is also fitted on the first fixing bolt.

[0011] In one possible implementation, a pin stop is provided on the first side of the mounting base. The pin stop has a circular structure and a limiting groove is provided in the middle of the pin stop.

[0012] In one possible implementation, three second threaded holes are evenly provided at the second end of the pin shaft, the cover plate is circular in shape and its outer diameter is larger than the diameter of the pin shaft hole, a through hole corresponding to the second threaded hole is provided in the middle of the cover plate, the cover plate is installed to the second end of the pin shaft by a second fixing bolt, and a second washer is also fitted on the second fixing bolt.

[0013] In one possible implementation, it also includes an anti-loosening structure, which is thread-locking adhesive applied to the threads of the first and second fixing bolts, and / or an elastic sealing ring disposed on the mating surface of the pressure plate, cover plate and pin shaft.

[0014] In one possible implementation, both ends of the pin column are provided with conical or chamfered guide heads.

[0015] In one possible implementation, the mounting base is provided with at least one grease nipple, which is connected to the mating surfaces of the pin shaft and the pin hole via an oil passage.

[0016] In one possible implementation, a wear-resistant bushing is installed between the pin shaft and the first and second oil cylinders.

[0017] In one possible implementation, at least one of the mating surfaces of the pressure plate and the pin stop block, and the second mating surface of the cover plate and the mounting base, is provided with a sealing ring or a dustproof ring.

[0018] This utility model also provides an excavator, including the dual-cylinder pin mounting structure described above.

[0019] Compared with the above-mentioned background technology, the present invention provides a double hydraulic cylinder pin mounting structure, including: a pin column, a pressure plate, and a cover plate; the pin column passes through a pin hole on the mounting base and is used to rotatably connect the first hydraulic cylinder and the second hydraulic cylinder to the mounting base; the pressure plate is detachably mounted on the first end of the pin column, and the pressure plate can engage with the limiting groove provided on the first side of the mounting base; the cover plate is detachably mounted on the second end of the pin column, and the cover plate can abut against the second side of the mounting base to axially limit the pin column.

[0020] Specifically, after the first and second hydraulic cylinders have been assembled into the mounting base, the pressure plate is installed on the first end of the pin shaft, making the pressure plate and the pin shaft a whole. Then, the second end of the pin shaft is inserted into the pin hole to complete the hinge connection between the first and second hydraulic cylinders. During this process, the pressure plate is inserted into the limiting slot on the first side of the mounting base, which can restrict the axial movement of the pin shaft and its rotation around its own axis. Then, the cover plate is installed on the second end of the pin shaft. At this time, the cover plate will be against the second side of the mounting base. In this way, the axial positioning and rotation restriction of the pin shaft can be achieved through the cover plate and the pressure plate.

[0021] This design, firstly, utilizes an axially movable pin column and independently detachable pressure plates and cover plates at both ends. When disassembling either side of the cylinder, simply remove the fixing parts on that side and push the pin towards the middle to complete the operation, without needing to disassemble the other side of the cylinder. This greatly simplifies the maintenance process and improves work efficiency. Moreover, the cooperation between the pressure plate and the limiting slot effectively restricts the circumferential rotation of the pin, and the double clamping of the pressure plate and cover plate restricts the axial movement of the pin, ensuring a secure fixation. Attached Figure Description

[0022] 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 described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is an exploded view of the double hydraulic cylinder pin mounting structure provided in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the first side structure of the mounting base provided in an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the second side structure of the mounting base provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the dual-cylinder pin mounting structure provided in this embodiment of the utility model when disassembling the second cylinder.

[0027] Figure 5 This is a schematic diagram of the structure of the double-cylinder pin mounting structure provided in this embodiment of the present invention when disassembling the first cylinder;

[0028] Figure 6 This is a schematic diagram of the first end structure of the pin column provided in an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the second end structure of the pin column provided in an embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of the pin stop structure provided in an embodiment of the present utility model.

[0031] in:

[0032] 01-Mounting base, 011-Pin hole, 012-First side, 013-Second side, 02-First cylinder, 03-Second cylinder;

[0033] 100 - Pin shaft body, 110 - First end, 111 - Countersunk groove, 112 - First threaded hole, 120 - Second end, 121 - Second threaded hole, 130 - First fixing bolt, 140 - First washer, 150 - Second fixing bolt, 160 - Second washer;

[0034] 200-Pressure plate;

[0035] 300-cover plate;

[0036] 400 - Pin stop, 410 - Limiting slot. Detailed Implementation

[0037] 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 some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" 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 indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0040] The purpose of this invention is to provide a double-cylinder pin mounting structure that enables bidirectional disassembly and installation of the pins connecting the cylinders.

[0041] To achieve the above objectives, the present invention provides the following technical solution:

[0042] Please see Figures 1 to 8 This embodiment provides a dual-cylinder pin mounting structure, including: a pin column 100, a pressure plate 200, and a cover plate 300; the pin column 100 passes through a pin hole 011 on the mounting base 01, and is used to rotatably connect the first cylinder 02 and the second cylinder 03 to the mounting base 01; the pressure plate 200 is detachably mounted on the first end 110 of the pin column 100, and the pressure plate 200 can be engaged with the limiting groove 410 provided on the first side 012 of the mounting base 01; the cover plate 300 is detachably mounted on the second end 120 of the pin column 100, and the cover plate 300 can abut against the second side 013 of the mounting base 01 to axially limit the pin column 100.

[0043] Specifically, the mounting base 01 is provided with a through-hole pin hole 011. The first hydraulic cylinder 02 and the second hydraulic cylinder 03 can be installed into the mounting base 01, and their mounting holes will correspond exactly to the pin hole 011. In this embodiment, the pin column 100 is an integral cylindrical structure, and its outer diameter matches the diameter of the pin hole 011. The axial length of the pin column 100 needs to be adjusted according to the actual situation. It is necessary to ensure that after the pin column 100 is installed, its two ends correspond exactly to the first side 012 and the second side 013 of the mounting base 01. That is, after the pressure plate 200 and the cover plate 300 are installed, they can be placed against the first side 012 and the second side 013 of the mounting base 01, respectively.

[0044] After the first hydraulic cylinder 02 and the second hydraulic cylinder 03 have been assembled into the mounting base 01, the pressure plate 200 is installed onto the first end 110 of the pin column 100, so that the pressure plate 200 and the pin column 100 form a whole. Then, the second end 120 of the pin column 100 is inserted into the pin hole 011 to complete the hinge of the first hydraulic cylinder 02 and the second hydraulic cylinder 03. During this process, the pressure plate 200 is inserted into the limiting slot 410 on the first side 012 of the mounting base 01, which can limit the axial movement of the pin column 100 and its rotation around its own axis. Then, the cover plate 300 is installed on the second end 120 of the pin column 100. At this time, the cover plate 300 will abut against the second side 013 of the mounting base 01. In this way, the axial positioning and rotation restriction of the pin column 100 can be achieved by the cover plate 300 and the pressure plate 200.

[0045] This design, firstly, utilizes the axially movable pin column 100 and the independently detachable pressure plate 200 and cover plate 300 at both ends. When disassembling either side of the cylinder, it is only necessary to remove the fixing part on that side and push the pin to the middle to complete the operation, without having to disassemble the other side of the cylinder, which greatly simplifies the maintenance process and improves work efficiency. Moreover, the cooperation between the pressure plate 200 and the limiting slot 410 effectively restricts the circumferential rotation of the pin, and the double clamping of the pressure plate 200 and the cover plate 300 restricts the axial movement of the pin, making it firmly fixed.

[0046] In one possible implementation, the first end 110 of the pin column 100 is provided with a rectangular groove 111 for mounting the pressure plate 200. The groove 111 is provided with a first threaded hole 112 for the first fixing bolt 130, and a first washer 140 is also fitted on the first fixing bolt 130.

[0047] Specifically, such as Figure 6 As shown, a rectangular countersunk groove 111 is milled into the first end 110 of the pin, with two first threaded holes 112 tapped in the middle. It is important to note that the width of the countersunk groove 111 is exactly equal to the width of the pressure plate 200, allowing the pressure plate 200 to be installed precisely within the countersunk groove 111. Simultaneously, the pressure plate 200 has two through holes corresponding to the positions of the first threaded holes 112, and the two first threaded holes 112 and the two through holes are symmetrically arranged. Before installing the pin onto the mounting base 01, the pressure plate 200 is first placed in the countersunk groove 111, and then the pressure plate 200 is fixed to the first end 110 of the pin shaft column 100 using the first fixing bolt 130. Furthermore, in this embodiment, the depth of the countersunk groove 111 is the same as the thickness of the pressure plate 200.

[0048] In addition, this embodiment will add a shim when installing the first fixing bolt 130 to increase the connection strength of the first fixing bolt 130.

[0049] In one possible implementation, a pin stop 400 is provided on the first side 012 of the mounting base 01. The pin stop 400 has a circular structure and a limiting groove 410 is provided in the middle of the pin stop 400.

[0050] Specifically, such as Figure 8As shown, the pin stop 400 is welded to the first side 012 of the mounting base 01. The pin stop 400 is an overall ring structure and is coaxially arranged with the pin hole 011. At the same time, on the outer side of the pin stop 400, that is, the side away from the mounting base 01, a limiting groove 410 with a certain width is provided radially through the center. The limiting groove 410 can be installed in the whole formed by the pressure plate 200 and the pin column 100 to lock the two ends of the pressure plate 200, thereby restricting the rotation of the pin column 100. Therefore, in this embodiment, the width of the limiting groove 410 matches the width of the pressure plate 200.

[0051] In one possible implementation, the second end 120 of the pin shaft 100 is provided with three second threaded holes 121 evenly distributed. The cover plate 300 is a circular structure with an outer diameter larger than the diameter of the pin shaft hole 011. The middle part of the cover plate 300 is provided with a through hole corresponding to the second threaded hole 121. The cover plate 300 is installed to the second end 120 of the pin shaft 100 by a second fixing bolt 150. A second washer 160 is also fitted on the second fixing bolt 150.

[0052] Specifically, such as Figure 7 As shown, the second end 120 of the pin column 100 has three second threaded holes 121 tapped on its end face, and these three second threaded holes 121 are evenly distributed. At the same time, the cover plate 300 has a through hole at the corresponding position. In this way, when the pin column 100 is installed in place, its second end 120 will just extend out of the mounting seat 01. Then, after the through hole on the cover plate 300 is aligned with the second threaded hole 121, the second fixing bolt 150 is installed, thus completing the installation of the cover plate 300. Moreover, since the outer diameter of the cover plate 300 is larger than the diameter of the pin hole 011, and the first end 110 of the pin column 100 is equipped with a pressure plate 200, it can be axially limited. The cooperation between the pressure plate 200 and the limiting groove 410 can limit the rotation of the pin column 100. Similarly, in this embodiment, a second washer 160 is added when installing the second fixing bolt 150 to increase its connection strength.

[0053] In one possible implementation, the system also includes an anti-loosening structure, which is thread-locking adhesive applied to the threads of the first fixing bolt 130 and the second fixing bolt 150, and / or an elastic sealing ring disposed on the mating surfaces of the pressure plate 200, the cover plate 300 and the pin column 100.

[0054] Furthermore, this embodiment also includes an anti-loosening structure. Specifically, thread-locking adhesive is used on the bolts fastening the pressure plate 200 and the cover plate 300, and an O-ring elastic seal is added to the mating surface between the pressure plate 200 and the cover plate 300 and the pin shaft 100. This not only prevents loosening but also provides a preliminary sealing effect. In this way, the pin shaft mounting structure can adapt to the high-intensity, high-vibration working environment of heavy-duty excavators, and can prevent the pressure plate 200 or cover plate 300 from failing due to loosening of the fixing bolts, which could lead to the pin shaft 100 moving and causing a serious accident. Therefore, the anti-loosening structure improves the stability and safety of the pin shaft mounting structure during use.

[0055] In one possible implementation, both ends of the pin column 100 are provided with conical or chamfered guide heads.

[0056] In this embodiment, a 30° chamfer or conical guide head is machined at the end of the pin column 100. This arrangement allows the pin column 100 to be easily guided into the pin hole 011 of the mounting seat 01 when passing through the lugs of multiple mounting seats 01, even if there is a slight alignment deviation between the cylinder and the mounting seat 01.

[0057] In one possible implementation, the mounting base 01 is provided with at least one grease nipple, which is connected to the mating surfaces of the pin shaft 100 and the pin hole 011 via an oil passage.

[0058] In this embodiment, lubricating grease nozzles are respectively provided on the middle ear and the two end ear of the mounting base 01, and the lubricating grease nozzles are connected to the pin hole 011. This oil passage design can lubricate both the rotational friction surface of the pin column 100 and the pin hole 011, and the axial movement surface of the pin column 100 and the pin hole 011. This ensures that the pin column 100 will not become stuck due to rust after long-term use and cannot be disassembled.

[0059] In one possible implementation, a wear-resistant bushing is installed between the pin shaft 100 and the first hydraulic cylinder 02 and the second hydraulic cylinder 03.

[0060] Furthermore, in order to improve the service life and wear resistance of the pin shaft 100, a phosphate treatment or a wear-resistant and friction-reducing coating is applied to the surface of the pin shaft 100 to reduce the coefficient of friction and prevent rust and jamming. At the same time, a wear-resistant bushing can be installed at the connection position between the pin shaft 100 and the cylinder. The wear-resistant bushing can be made of copper-based or bimetallic composite material, which greatly improves wear resistance and is easy to replace after wear, thus protecting the pin shaft 100.

[0061] In one possible implementation, at least one of the groove mating surfaces of the pressure plate 200 and the pin stop 400, and the mating surfaces of the cover plate 300 and the second side 013 of the mounting base 01, is provided with a sealing ring or a dustproof ring.

[0062] Understandably, in order to prevent external impurities from entering between the pin shaft body 100 and the pin shaft hole 011, a sealing ring or dustproof ring can be provided at least at one of the mating surfaces of the pressure plate 200 and the pin shaft stop 400 limiting groove 410, and the mating surfaces of the cover plate 300 and the second side 013 of the mounting base 01.

[0063] In summary, this application provides a dual-cylinder pin mounting structure, which reduces the correlation between the two cylinders within a limited space. When the first cylinder 02 malfunctions and needs replacement, loosen the first fastening bolt and the first washer 140, remove the pressure plate 200, and push the pin shaft 100 to the left towards the middle ear on the mounting base 01 to disassemble the first cylinder 02. Specifically, as shown below... Figure 5 As shown; when the second hydraulic cylinder 03 malfunctions and needs to be replaced, loosen the second fastening bolt and the second washer 160, remove the cover plate 300, and push the pin shaft 100 to the right towards the middle ear seat on the mounting base 01 to disassemble the second hydraulic cylinder 03. Specifically, as shown... Figure 4 As shown; that is, when a single-sided cylinder fails, the pressure plate 200 or cover plate 300 and fixing bolts on the corresponding side can be loosened, and the pin shaft column 100 can be pushed to the middle ear seat position, so that the faulty cylinder that needs to be replaced can be removed. This effectively solves the problem that both cylinders need to be removed when disassembling a faulty cylinder with a unidirectional fixed pin shaft, greatly improving work efficiency and assembly convenience.

[0064] This utility model also provides an excavator, including the dual-cylinder pin mounting structure described above, thus the excavator has the beneficial effects of the aforementioned pin mounting structure.

[0065] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A double-cylinder pin mounting structure, characterized in that, include: A pin shaft (100) passes through a pin hole (011) on a mounting base (01) and is used to rotatably connect the first oil cylinder (02) and the second oil cylinder (03) to the mounting base (01). The pressure plate (200) is detachably installed on the first end (110) of the pin column (100), and the pressure plate (200) can be engaged with the limiting slot (410) provided on the first side (012) of the mounting base (01). A cover plate (300) is detachably mounted on the second end (120) of the pin column (100), and the cover plate (300) can abut against the second side (013) of the mounting base (01) to axially limit the pin column (100).

2. The dual-cylinder pin mounting structure according to claim 1, characterized in that, The first end (110) of the pin column (100) is provided with a rectangular groove (111), the groove (111) is used to install the pressure plate (200), the groove (111) is provided with a first threaded hole (112) for the first fixing bolt (130), and a first washer (140) is also fitted on the first fixing bolt (130).

3. The dual-cylinder pin mounting structure according to claim 2, characterized in that, The first side (012) of the mounting base (01) is provided with a pin stop (400), the pin stop (400) is a circular structure, and the limiting groove (410) is provided in the middle of the pin stop (400).

4. The dual-cylinder pin mounting structure according to claim 2, characterized in that, The second end (120) of the pin column (100) is uniformly provided with three second threaded holes (121). The cover plate (300) is a circular structure and its outer diameter is larger than the diameter of the pin hole (011). The middle part of the cover plate (300) is provided with a through hole corresponding to the second threaded hole (121). The cover plate (300) is installed to the second end (120) of the pin column (100) by a second fixing bolt (150). A second washer (160) is also fitted on the second fixing bolt (150).

5. The dual-cylinder pin mounting structure according to claim 4, characterized in that, It also includes an anti-loosening structure, which is thread-locking adhesive applied to the threads of the first fixing bolt (130) and the second fixing bolt (150), and / or an elastic sealing ring disposed on the mating surface of the pressure plate (200), the cover plate (300) and the pin column (100).

6. The dual-cylinder pin mounting structure according to claim 1, characterized in that, Both ends of the pin column (100) are provided with conical or chamfered guide heads.

7. The double-cylinder pin mounting structure according to any one of claims 1-6, characterized in that, The mounting base (01) is provided with at least one lubricating grease nozzle, which is connected to the mating surfaces of the pin shaft (100) and the pin shaft hole (011) through an oil passage.

8. The dual-cylinder pin mounting structure according to any one of claims 1-6, characterized in that, Wear-resistant bushings are installed between the pin shaft (100) and the first oil cylinder (02) and the second oil cylinder (03).

9. The dual-cylinder pin mounting structure according to claim 3, characterized in that, At least one of the mating surfaces of the pressure plate (200) and the pin stop (400) of the limiting groove (410), and the mating surfaces of the cover plate (300) and the second side (013) of the mounting base (01), is provided with a sealing ring or a dustproof ring.

10. An excavator, characterized in that, Includes the dual-cylinder pin mounting structure as described in any one of claims 1-9.

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