Hydraulic oscillating cylinder with large-torque supporting structure for quick-change connector of excavator

Abstract

The utility model provides a hydraulic oscillating cylinder with a large-torque supporting structure for a quick-change connector of an excavator, which is provided with an outer shell, a main shaft is arranged in the outer shell, a left connecting seat plate is fixedly arranged at the left end of the main shaft, and the left connecting seat plate and the leftmost part of the main shaft are mutually fixed through a left rotating supporting block. A spindle right shaft sleeve is arranged on the outer circumference of the rightmost side of the spindle, a right connecting seat plate is fixedly arranged at the right end of the spindle right shaft sleeve, and the right connecting seat plate and the spindle right shaft sleeve are mutually fixed through a right rotary supporting block. The hydraulic oscillating cylinder solves the problems that on an existing hydraulic oscillating cylinder, a connecting base plate used for being connected with a quick-change connector and a main shaft of the oscillating cylinder are fixed only through a plurality of screws, and when the oscillating cylinder works for a long time, the screws between the connecting base plate and the main shaft are prone to loosening and even falling off. The hydraulic oscillating cylinder can be widely applied to the quick-change connector of the excavator.

Description

Technical Field

[0001] This utility model relates to a hydraulic swing cylinder, and more particularly to a hydraulic swing cylinder with a high torque support structure for excavator quick-change couplings. Background Technology

[0002] During operation, excavators need to frequently change buckets of different specifications to meet different digging size requirements. In order to enable excavators to change buckets quickly and accurately at different angles, one or more sets of hydraulic swing cylinders are usually installed on the boom. Then, quick-change couplings are installed at the front end of the hydraulic swing cylinders, so as to realize the omnidirectional rotation of the quick-change couplings. Finally, the rotation of the swing cylinders controls the quick-change couplings to quickly and accurately align with the connecting rod of the bucket, thus realizing the quick bucket change operation.

[0003] However, on existing excavator quick-change hydraulic swing cylinders, the connecting seat plate used to connect the quick-change connector and the main shaft of the swing cylinder are only fixed by a few screws. When the swing cylinder operates for a long time, the screws between the connecting seat plate and the main shaft are prone to loosening or even falling off.

[0004] If the screws become loose, it will directly cause a rotational gap between the spindle and the connecting seat plate, reducing the accuracy of the quick-change joint's swing. This will prevent the quick-change joint from quickly and accurately aligning with the connecting rod of the bucket during bucket replacement, making it impossible to quickly replace the bucket. It will also affect the accuracy of the bucket's digging operation. More importantly, if all the screws fall off, it will directly cause the quick-change joint and the bucket to fall off, creating a serious safety hazard. Utility Model Content

[0005] This utility model addresses the above-mentioned technical problems by providing a hydraulic swing cylinder with a high-torque support structure for excavator quick-change couplings. By installing a rotating support block in the hydraulic swing cylinder with a high-torque support structure for excavator quick-change couplings, all-round locking is achieved between the left end of the main shaft and the left connecting seat plate, and between the right side bushing of the main shaft and the right connecting seat plate, which can prevent the problems of loosening or even falling off between the left end of the main shaft and the left connecting seat plate, and between the right side bushing of the main shaft and the right connecting seat plate.

[0006] Therefore, the technical solution of this utility model is a hydraulic swing cylinder with a high torque support structure for excavator quick-change joints, which is provided with an outer shell, and a main shaft is provided inside the outer shell. The main shaft includes a first shaft section, a second shaft section, and a third shaft section. The first shaft section is located on the left side of the outer shell, the second shaft section is located in the middle of the outer shell, and the third shaft section is located on the right side of the outer shell.

[0007] The outer circumference of the first shaft section of the main shaft is sealed and rotatably connected to the left inner circumference of the outer shell. A right-side bushing of the main shaft is provided between the outer circumference of the third shaft section of the main shaft and the right inner circumference of the outer shell. The inner circumference of the right-side bushing of the main shaft is fixedly connected to the outer circumference of the third shaft section of the main shaft. The outer circumference of the right-side bushing of the main shaft is sealed and rotatably connected to the right inner circumference of the outer shell.

[0008] The outer end of the first shaft section of the main spindle is provided with a left connecting seat plate, and the left connecting seat plate is axially locked to the first shaft section of the main spindle;

[0009] A through hole is provided on the left connecting seat plate at the axial center of the first shaft section of the main spindle, and a groove is provided at the axial center of the outer end of the first shaft section of the main spindle. A left rotating support block is provided in the through hole on the left connecting seat plate, and the inner axial part of the left rotating support block is located inside the groove of the first shaft section of the main spindle. The left rotating support block is circumferentially locked with the left connecting seat plate and the first shaft section of the main spindle.

[0010] The outer axial end of the right side bushing of the main spindle extends beyond the outer axial end of the third shaft section of the main spindle, and a groove is provided between the inner circumference of the outer axial side of the right side bushing of the main spindle and the outer axial end of the third shaft section of the main spindle.

[0011] The outer axial end of the right sleeve of the main spindle is provided with a right connecting seat plate, and the right connecting seat plate is axially locked with the right sleeve of the main spindle;

[0012] A through hole is provided on the right connecting seat plate at the axial center of the third shaft section of the main spindle. A right rotating support block is provided in the through hole of the right connecting seat plate. The axial inner part of the right rotating support block is located in the groove between the inner circumference of the outer axial side of the right shaft sleeve of the main spindle and the outer axial side end of the third shaft section of the main spindle. The right rotating support block is locked in the circumferential direction with the right connecting seat plate and the right shaft sleeve of the main spindle.

[0013] Preferably, the through holes on the left rotating support block, the left connecting plate, and the grooves on the first shaft segment of the main shaft are all matching polygonal shapes;

[0014] The through holes on the right rotating support block and the right connecting plate, as well as the groove between the inner circumference of the outer side of the right spindle bushing and the outer end of the third shaft section of the spindle, are all matching polygonal shapes.

[0015] Preferably, pressure plates are provided on the outer sides of the left and right rotating support blocks respectively, and the portions of the two pressure plates near the outer circumference are locked to the left and right connecting seat plates respectively.

[0016] Preferably, the left and right rotating support blocks are respectively provided with grooves at their outer axial ends, and springs are provided in the two grooves respectively. The springs are continuously compressed under the action of the grooves and the pressure plate.

[0017] Preferably, a support pad is provided between the first shaft segment of the main spindle and the left connecting seat plate, and the left connecting seat plate, the support pad, and the first shaft segment of the main spindle are axially locked together;

[0018] The support pad has a through hole at the center of the first shaft section of the main spindle. The shape of the through hole on the support pad is the same as the shape of the through hole on the left rotating support block, the left connecting seat plate, and the groove on the first shaft section of the main spindle.

[0019] Preferably, the left connecting plate, the support pad, and the first shaft section of the main shaft are axially locked together by screws;

[0020] The right-side bushing of the main spindle is axially locked to the right-side connecting plate by screws.

[0021] The two pressure plates are axially locked to the left and right connecting seat plates respectively by screws.

[0022] The beneficial effects of this utility model are that by installing a left rotating support block and a right rotating support block on both sides, the consistency of rotation between the left and right connecting plates and the main shaft can be ensured under the support of the left and right rotating support blocks, avoiding rotational gaps between the left and right connecting plates and the main shaft. More importantly, it avoids the impact of inertial force on the screw when the main shaft rotates, which could cause the screw to loosen or even break.

[0023] Specifically, in existing technology, the left and right connecting plates are axially locked to the main shaft using screws. At the instant the main shaft stops rotating, the left and right connecting plates continue to be subjected to force in the direction of rotation due to the inertia of the main shaft's rotation. This inertial force acts directly on the screws, and under repeated impacts from this force, the screws may loosen or even break, posing a serious safety hazard. However, by installing a rotating support block, on the one hand, most of the aforementioned inertial force is applied to the rotating support block, thus avoiding impact on the screws. On the other hand, the combined effect of the axial locking of the screws and the radial locking of the rotating support block minimizes rotational clearance between the main shaft and the left and right connecting plates, increasing the accuracy of synchronous rotation between the main shaft and the left and right connecting plates, thereby improving the accuracy of bucket replacement and shortening replacement time. Attached Figure Description

[0024] Figure 1 This is a perspective view of the utility model;

[0025] Figure 2 This is another perspective view of the present invention;

[0026] Figure 3 This is the front view of this utility model;

[0027] Figure 4 This is a utility model Figure 3 Sectional view of AA;

[0028] Figure 5 This is a utility model Figure 4 Enlarged view at point B in the middle;

[0029] Figure 6 This is a utility model Figure 4 Enlarged view of point C in the middle.

[0030] Explanation of symbols in the diagram:

[0031] 1. Outer shell; 2. Spindle; 201. First spindle section; 202. Second spindle section; 203. Third spindle section; 3. Right spindle bushing; 4. Left connecting plate; 5. Right connecting plate; 6. Left rotating support block; 7. Right rotating support block; 8. Support washer; 9. Groove; 10. Spring; 11. Screw; 12. Rotary piston; 13. Internal gear ring; 14. Pressure plate. Detailed Implementation

[0032] The present invention will be further described below with reference to the embodiments.

[0033] pass Figures 1-6 As can be seen, the excavator quick-connect coupling uses a hydraulic swing cylinder with a high torque support structure, which has an outer shell 1. The main shaft 2 is located inside the outer shell 1. The main shaft 2 includes a first shaft section 201, a second shaft section 202, and a third shaft section 203. The first shaft section 201 is located on the left side of the outer shell 1, the second shaft section 202 is located in the middle of the outer shell 1, and the third shaft section 203 is located on the right side of the outer shell 1.

[0034] The outer circumference of the first shaft section 201 of the main shaft is sealed and rotatably connected to the left inner circumference of the outer casing 1. A right-side shaft sleeve 3 of the main shaft is provided between the outer circumference of the third shaft section 203 of the main shaft and the right inner circumference of the outer casing 1. The inner circumference of the right-side shaft sleeve 3 of the main shaft is fixedly connected to the outer circumference of the third shaft section 203 of the main shaft, and the outer circumference of the right-side shaft sleeve 3 of the main shaft is sealed and rotatably connected to the right inner circumference of the outer casing 1.

[0035] The outer end of the first shaft section 201 of the main spindle is provided with a left connecting seat plate 4, which is axially locked to the first shaft section 201 of the main spindle.

[0036] A through hole is provided on the left connecting seat plate 4 at the axial center of the first shaft segment 201 of the main spindle, and a groove is provided at the axial center of the outer end of the first shaft segment 201 of the main spindle. A left rotating support block 6 is provided in the through hole on the left connecting seat plate 4. The inner axial part of the left rotating support block 6 is located inside the groove of the first shaft segment 201 of the main spindle. The left rotating support block 6 locks the left connecting seat plate 4 and the first shaft segment 201 of the main spindle in the circumferential direction. Combined with the axial locking between the left connecting seat plate 4 and the first shaft segment 201 of the main spindle, the left connecting seat plate 4 and the first shaft segment 201 of the main spindle are locked in all directions.

[0037] The outer axial end of the right side bushing 3 of the main spindle extends beyond the outer axial end of the third shaft section 203 of the main spindle, and a groove is provided between the inner circumference of the outer axial side of the right side bushing 3 of the main spindle and the outer axial end of the third shaft section 203 of the main spindle.

[0038] The outer end of the right side bushing 3 of the main spindle is provided with a right side connecting seat plate 5, which is axially locked with the right side bushing 3 of the main spindle.

[0039] A through hole is provided on the right connecting seat plate 5 at the axial center of the third shaft section 203 of the main spindle. A right rotating support block 7 is provided in the through hole of the right connecting seat plate 5. The axial inner part of the right rotating support block 7 is located in the groove between the inner circumference of the outer axial side of the right shaft sleeve 3 of the main spindle and the outer axial side end of the third shaft section 203 of the main spindle. The right rotating support block 7 locks the right connecting seat plate 5 and the right shaft sleeve 3 of the main spindle in the circumferential direction, thereby locking the right shaft sleeve 3 of the main spindle and the third shaft section 203 of the main spindle in all directions.

[0040] The rotating support block ensures consistent rotation between the left connecting plate 4 and the right connecting plate 5 and the main shaft 2, preventing any rotational clearance between them. In contrast, existing technology merely uses screws 11 to axially lock the left connecting plate 4 and the right connecting plate 5 to the main shaft 2. At the instant the main shaft 2 stops rotating, the left connecting plate 4 and the right connecting plate 5 continue to be subjected to force in the rotational direction due to the inertia of the main shaft 2. This inertial force acts directly on the screw 11, and the screw 11 experiences this force for a considerable period. Under impact, the screw may loosen or even break, posing a serious safety hazard. By installing a rotating support block, on the one hand, most of the inertial force will act on the rotating support block, thus avoiding stress on the screw 11. On the other hand, under the combined action of axial locking of the screw 11 and radial locking of the rotating support block, the rotational gap between the main shaft 2 and the left connecting seat plate 4 and the right connecting seat plate 5 is minimized, increasing the accuracy of synchronous rotation of the main shaft 2 and the left connecting seat plate 4 and the right connecting seat plate 5, thereby improving the accuracy of the bucket replacement process and shortening the replacement time.

[0041] An internal gear ring 13 and a rotary piston 12 are sequentially arranged from the outside to the inside between the outer circumference of the second shaft section 202 of the main shaft and the inner circumference of the outer shell 1. The outer circumference of the internal gear ring 13 is fixedly connected to the inner circumference of the outer shell 1. The inner circumference of the internal gear ring 13 meshes and rotates with the outer circumference on one axial side of the rotary piston 12. The inner circumference on the same axial side of the rotary piston 12 meshes and rotates with the outer circumference of the second shaft section 202 of the main shaft.

[0042] The inner and outer circumferences of the rotary piston 12 on the other side of the axial direction are rotaryly sealed with the outer circumference of the second shaft section 202 of the main shaft and the inner circumference of the outer shell 1, respectively. This achieves a rotary seal between the outer shell 1 and the hydraulic oil under the thrust of the hydraulic oil. The outer shell 1 is provided with a left oil hole and a right oil hole, respectively. The hydraulic oil enters from the left oil hole and the right oil hole, respectively, and pushes the rotary piston 12 to rotate and translate left and right. While the rotary piston 12 rotates and translates left and right, it drives the main shaft 2 to rotate in both directions. While the main shaft 2 rotates in both directions, it drives the left connecting seat plate 4 and the right connecting seat plate 5 to rotate in both directions simultaneously. While the left connecting seat plate 4 and the right connecting seat plate 5 rotate in both directions, they drive the quick connector to rotate in both directions, and finally achieve quick alignment and installation between the quick connector and the bucket.

[0043] The through holes on the left rotating support block 6 and the left connecting seat plate 4, as well as the groove on the first shaft section 201 of the main spindle, are all matching polygonal shapes. The through holes on the right rotating support block 7 and the right connecting seat plate 5, as well as the groove between the inner circumference of the outer axial side of the right shaft sleeve 3 of the main spindle and the outer axial side of the third shaft section 203 of the main spindle, are all matching polygonal shapes, such as triangles, squares, hexagons, etc. Through the support characteristics of its polygonal structure, the rotation gap between the main spindle 2 and the rotating support blocks on both sides, as well as between the connecting seat plates on both sides and the rotating support blocks, is further avoided when the main spindle 2 rotates. This further ensures the consistency of the rotation of the main spindle 2 and the connecting seat plates on both sides, and minimizes the problem of the screw 11 loosening or even breaking.

[0044] The left rotating support block 6 and the right rotating support block 7 are respectively provided with pressure plates 14 on their outer axial sides. The parts of the two pressure plates 14 near the outer circumference are locked to each other with the left connecting seat plate 4 and the right connecting seat plate 5 respectively. The pressure plates 14 limit the left rotating support block 6 and the right rotating support block 7 to the corresponding groove area, so as to prevent the left rotating support block 6 and the right rotating support block 7 from falling outward.

[0045] The left rotating support block 6 and the right rotating support block 7 are respectively provided with grooves 9 on their outer axial ends. Springs 10 are respectively provided in the two grooves 9. When the two springs 10 are relaxed, the outer parts of the springs 10 are located on the outer axial sides of the left rotating support block 6 and the right rotating support block 7, respectively. Under the action of the grooves 9 and the pressure plate 14, the two sides of the springs 10 are continuously compressed, thereby ensuring that the left rotating support block 6 and the right rotating support block 7 are tightly fitted with the corresponding two grooves, and preventing the left rotating support block 6 and the right rotating support block 7 from swaying left and right when the swing cylinder is in operation.

[0046] A support pad 8 is provided between the first shaft section 201 of the main spindle and the left connecting seat plate 4. The left connecting seat plate 4, the support pad 8, and the first shaft section 201 of the main spindle are axially locked together. The support pad 8 has a through hole at the axial center of the first shaft section 201 of the main spindle. The shape of the through hole on the support pad 8 is the same as the shape of the through hole on the left rotating support block 6, the left connecting seat plate 4, and the groove on the first shaft section 201 of the main spindle.

[0047] By adding support shims 8 and adjusting the number of support shims 8, the distance between the left connecting plate 4 and the right connecting plate 5 can be changed, thereby adapting to quick-connect couplings of different specifications and making it widely applicable.

[0048] The left connecting plate 4, the support pad 8, and the first shaft section 201 of the main shaft are axially locked together by screws 11. The right shaft sleeve 3 of the main shaft is axially locked together with the right connecting plate 5 by screws 11. The two pressure plates 14 are axially locked together with the left connecting plate 4 and the right connecting plate 5 by screws 11 respectively. This enables quick disassembly and assembly of related components, facilitating maintenance.

[0049] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A hydraulic swing cylinder with a high torque support structure for excavator quick-connect couplings, characterized in that: The device includes an outer casing, inside which is a main shaft. The main shaft includes a first shaft segment, a second shaft segment, and a third shaft segment. The first shaft segment is located on the left side of the outer casing, the second shaft segment is located in the middle of the outer casing, and the third shaft segment is located on the right side of the outer casing. The outer circumference of the first shaft section of the main shaft is sealed and rotatably connected to the left inner circumference of the outer shell. A right-side bushing of the main shaft is provided between the outer circumference of the third shaft section of the main shaft and the right inner circumference of the outer shell. The inner circumference of the right-side bushing of the main shaft is fixedly connected to the outer circumference of the third shaft section of the main shaft. The outer circumference of the right-side bushing of the main shaft is sealed and rotatably connected to the right inner circumference of the outer shell. The outer end of the first shaft section of the main spindle is provided with a left connecting seat plate, and the left connecting seat plate is axially locked to the first shaft section of the main spindle. The left connecting plate has a through hole at the axial center of the first shaft segment of the main shaft, and a groove at the axial center of the outer end of the first shaft segment of the main shaft. A left rotating support block is provided in the through hole of the left connecting plate. The inner axial part of the left rotating support block is located inside the groove of the first shaft segment of the main shaft. The left rotating support block is circumferentially locked to the left connecting plate and the first shaft segment of the main shaft. The outer axial end of the right side bushing of the main shaft extends beyond the outer axial end of the third shaft section of the main shaft, and a groove is provided between the inner circumference of the outer axial side of the right side bushing of the main shaft and the outer axial end of the third shaft section of the main shaft. The outer axial end of the right sleeve of the main shaft is provided with a right connecting seat plate, and the right connecting seat plate is axially locked with the right sleeve of the main shaft. The right connecting seat plate has a through hole at the axial center of the third shaft segment of the main shaft. A right rotating support block is provided in the through hole of the right connecting seat plate. The axial inner part of the right rotating support block is located in the groove between the inner circumference of the outer axial side of the right shaft sleeve of the main shaft and the outer axial side end of the third shaft segment of the main shaft. The right rotating support block is circumferentially locked with the right connecting seat plate and the right shaft sleeve of the main shaft.

2. The hydraulic swing cylinder with high torque support structure for excavator quick-connect couplings according to claim 1, characterized in that: The through holes on the left rotating support block, the left connecting plate, and the grooves on the first shaft section of the main shaft are all matching polygonal shapes. The through holes on the right rotating support block and the right connecting plate, as well as the groove between the inner circumference of the outer side of the right shaft sleeve of the main shaft and the outer end of the third shaft segment of the main shaft, are all matching polygonal shapes.

3. The hydraulic swing cylinder with high torque support structure for excavator quick-connect couplings according to claim 2, characterized in that: The left and right rotating support blocks are respectively provided with pressure plates on their outer axial sides, and the portions of the two pressure plates near the outer circumference are locked to the left and right connecting seat plates respectively.

4. The hydraulic swing cylinder with high torque support structure for excavator quick-connect couplings according to claim 3, characterized in that: The left and right rotating support blocks are respectively provided with grooves at their outer axial ends, and springs are provided in the two grooves respectively. The springs are continuously compressed on both sides under the action of the grooves and the pressure plate.

5. The hydraulic swing cylinder with high torque support structure for excavator quick-connect couplings according to claim 4, characterized in that: A support pad is provided between the first shaft section of the main spindle and the left connecting seat plate, and the left connecting seat plate, the support pad, and the first shaft section of the main spindle are axially locked together. The support pad has a through hole at the axial center of the first shaft section of the main shaft. The shape of the through hole on the support pad is the same as the shape of the through hole on the left rotating support block, the left connecting seat plate, and the groove on the first shaft section of the main shaft.

6. The hydraulic swing cylinder with high torque support structure for excavator quick-connect couplings according to claim 4, characterized in that: The left connecting plate, support pad, and first shaft section of the main shaft are axially locked together by screws. The right-side bushing of the main shaft is axially locked to the right-side connecting seat plate by screws. The two pressure plates are axially locked to the left connecting seat plate and the right connecting seat plate respectively by screws.

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